Engine-operated generator

BACKGROUND OF THE INVENTION

The Invention relates to a driven by a combustion engine Generator which completely by a soundproof case is included.

On of an internal combustion engine driven generator, in which a Combustion engine and a generator are combined, the internal combustion engine drives is often used on building sites. If the generator is in urban Areas and particular operating at night, as is often terms the effects on the environment of an internal combustion engine driven generator used fully by a; soundproof case included is to ensure that the operating noise as quietly as possible stay.

at this type of generator driven by an internal combustion engine is one endeavors openings for sucking and ejecting Air in number and size as much as possible to restrict, thus the required low operating noise can be obtained. on the other hand you have great Care to cooling use of the interior of the soundproof case because the area of ​​the openings is small.

In Japanese utility model publication no. 64-3777 is one of a Internal combustion engine driven generator is disclosed in which a enclosed combustion engine and a muffler of a tube are, that they are from other devices isolated. By the Tube is forced air cooling promoted and on the side of the silencer from the soundproof case dismissed, thus preventing that the hot exhaust air soundproof in the housing is returned.

There However, the generator outside the tube in the soundproof case is arranged, besides the mentioned pipe a further cooling air passage has or own cooling fan for the generator be provided. Therefore, the motor-driven generator assumes large dimensions at.

At the of an internal combustion engine operated generator of the Japanese Utility Model Publication no. 64-3777 is a fan for cooling the generator separates ge provided by a cooling fan, the air forced through the tube promotes the combustion engine the and the muffler covers. The air, which delivers the generator cooling fan, is after cooling the generator out into the pipe. This creates a problem that the air from the generator cooling fan a must possess certain high discharge pressure, so that they in the pipe may occur. This is not necessarily an efficient cooling system.

US-A-4,702,201 discloses an internal combustion engine driven generator, having an internal combustion engine and a dynamo, the are cooled by separate cooling fans and air currents. These air flows then into a muffler pipe, so that the muffler is cooled.

EP-A1-0648924 discloses an internal combustion engine driven generator, in which a generator, an internal combustion engine, a fan and a silencer are arranged in this order in a soundproof casing. In soundproof casing are a internal-combustion engine and a generator chamber, contains the other components, For example, a battery and control units, through a wall separated. The fan is located in a hole in the wall, with a guide or an enclosing Wall the blower surrounds. The silencer and a cooler for the water-cooled engine are arranged in the other part of the interior of the soundproof casing, which is divided by the wall.

US-A-5,4299,469 discloses an internal combustion engine driven generator, where within an enclosure a blower, arranged a generator and an internal combustion engine in this order are. A brush subdivision divides the interior of the enclosure in a portion of the fan contains, and a portion of the internal combustion engine and the generator contains.

US-A-5,433,175 discloses a motor generator driven by an internal combustion for a recreational vehicle (RV, RV = Recreation Vehicle), in which a blower, a generator and a liquid-cooled engine are arranged in this order in a housing.

US-A-5,121,715 discloses an internal combustion engine driven generator, comprising the features of the preamble of Claim first

The Invention aims to provide a compact of an internal combustion engine provide driven generator having a high soundproofing effect comprising, and in which both the generator and the internal combustion engine and the muffler effectively cooled can be.

According to the invention is one of an internal combustion engine driven generator according to claim 1 provided.

There by the generator-side opening in the tube sucked air generator with its relatively low Temperature cools first and then in that order the engine and the muffler with higher dismiss temperatures and the air silencer each in the environment is, both the generator and the internal combustion engine and the muffler effect cooled.

one can achieve high sound insulation effect, since the internal combustion engine is doubly enclosed by the tube and the soundproof case. The generator, the engine and the muffler need only be arranged in this order in the tube. You can, for example, L-shaped be accommodated, so that the room well in soundproof case exploited and the device is compact.

Of the Generator, a generator with external rotor to be having an external rotor, which serves as a flywheel of the internal combustion engine. The cooling fan may in the opening the tube on the side of the generator in one piece with the External rotor provided be.

There the external rotor of the Generator serves as a flywheel of the engine, one can the length the motor-operated generator in the axial direction kept low. Since the cooling fan in a piece with formed the external rotor is it a cooling fan can easily high provide power, and can be a high load bearing strength blower to accomplish.

Of the Cylinders of the engine can be laterally inclined be. The silencer can in one room the cylinder can be arranged.

There you a large silencer may order in the space above by tilting the cylinder the Combustion engine is formed which can Dimen sung in vertical Direction and also the size in the axial head towards low, so that the device is as small as possible. Moreover, you can get a reasonable cooling air flow for effective cooling produce, because the hotter Section in a higher Position is located.

Of the silencer may be formed perpendicular to the rotational shaft of the engine elongated in a direction be. A muffler high power, in the space above the inclined cylinder be accommodated, and the vertical dimension of the unit remains nevertheless small.

Of the Generator, a multi-pole generator with external rotor to be having a magnet rotor. It , a control circuit may be present, the output of the generator is reacted in an alternating current with a predetermined frequency.

It is possible, the axial size of the generator keep low and at low load, the generator speed to lower, so that the operating noise decreases greatly.

BRIEF DESCRIPTION OF THE DRAWINGS

It shows:

<figref idrefs="S16">1</figref> a exterior view one of an internal combustion engine driven generator according to a preferred embodiment, the invention;

<figref idrefs="S17">2</figref> a exploded perspective view of a soundproof case and inner frame members;

<figref idrefs="S18">3</figref> a Plan view of an internal combustion engine driven generator, in which a cover in the cabin and a fuel tank were omitted;

<figref idrefs="S19">4</figref> a Side view of an internal combustion engine driven generator, with some parts omitted;

<figref idrefs="S20">5</figref> a Front view of the generator;

<figref idrefs="S21">6</figref> a rear view of the generator; and

<figref idrefs="S22">7</figref> a Side view partially cut the generator and its representing around.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

in the Furthermore, a preferred embodiment of the invention is based from <figref idrefs="S16">1</figref> to <figref idrefs="S22">7</figref> described.

Of the of an internal combustion engine driven generator <figref>1</figref> ferred according to the before embodiment is complete with a soundproof case <figref>2</figref> covered and forms a cube, please refer <figref idrefs="S16">1</figref>,

<figref idrefs="S17">2</figref> shows an exploded perspective view of the soundproof case <figref>2</figref> and Another inner frame parts. A lower frame member<figref>3</figref> is in Form a shallow bowl formed and has a front wall <figref>3a</figref>, A right wall <figref>3b</figref> and a rear wall <figref>3c</figref> on. The front wall <figref>3a</figref> and the right wall <figref>3b</figref> are with suction holes <figref>4a</figref>. <figref>4b</figref> provided. The rear wall <figref>3c</figref> can be removed. On the inside of the lower frame member<figref>3</figref> are a front and a rear support member <figref>3p</figref>. <figref>3q</figref> appropriate, extending parallel to each other from the right extending to the left.

On the lower frame member <figref>3</figref> rise substantially rectangular front and rear frame parts <figref>5</figref>. <figref>6</figref>Which today face at a predetermined distance.

Upper Edge portions of the front frame part <figref>5</figref> are back bent to form flanges <figref>5a</figref>, A rectangular wall section the front frame part <figref>5</figref> has a rectangular open hole <figref>5b</figref> from elongated Shape that extends in the upper part of right to left, and an open communication hole <figref>5c</figref>Which in the form of a formed partially lobed circle in the lower part.

The rear frame member <figref>6</figref> is into an upper and with a lower portion. By Connecting the upper and lower portion is a large rectangular Through Hole <figref>7a</figref> formed at the center. From through hole<figref>7a</figref> extends a pipe <figref>7</figref> after from, in one piece with the rear frame part <figref>6</figref> educated is. Upper edge portions of the rear frame part<figref>6</figref> are bent forward and form flanges <figref>6a</figref>, The front portion the tube <figref>7</figref> has the form of a rectangular tube, opens forward.

Behind the rear frame part <figref>6</figref> is a product made from glass wool pipe <figref>8</figref> arranged. The pipe<figref>8</figref> bulges to the rear and is connected via the through hole <figref>7a</figref> with the tube <figref>7</figref> in connection. The pipe <figref>8</figref> has substantially the shape of a rectangular Box, which is the front and open at the bottom and in an upper sidewall an outlet <figref>8a</figref> Has.

In between the front frame part <figref>5</figref> and the rear frame part <figref>6</figref>. the about the lower frame member <figref>3</figref> collect, running from front to back a left and a right reinforcing rail <figref>9</figref>. <figref>9</figref>. the upper corners of the frame parts <figref>5</figref>. <figref>6</figref> pierced.

A Mitenabdeckung <figref>11</figref>Having the shape of a halved square Pipe has, along the outer edges the front and rear frame parts <figref>5</figref>. <figref>6</figref> appropriate and covers the space between the frame members <figref>5</figref>. <figref>6</figref> and differentiates it from the environment.

The center cover <figref>11</figref> is formed by bending a plate in brought the shape of a halved square pipe and has a left side wall <figref>11a</figref>, Top wall <figref>11b</figref> and a right upper side wall <figref>11c</figref> on. The lower right Side of the center cover <figref>11</figref> is closed by a cover part <figref>12</figref> covered, the open isolated and close leaves, and defining a center compartment <figref>22</figref> (<figref idrefs="S18">3</figref>) among themselves. In the upper wall of the center cover<figref>11</figref> is a circular hole <figref>11d</figref> educated, through which a fuel filler neck <figref>55b</figref> one Fuel Tanks <figref>55</figref> protrudes (<figref idrefs="S19">4</figref>).

The Front of the front frame part <figref>5</figref> is provided with a front cover <figref>13</figref> covered, which essentially has the shape of a rectangular box and a front compartment <figref>21</figref> limited. The rear of the rear frame part<figref>6</figref> is of a rear cover <figref>14</figref> covered, which essentially has the shape of a rectangular box and a rear compartment <figref>23</figref> limited. Along the inside of the cover rückwärigen <figref>14</figref> extends the said tube <figref>8</figref> out Glass wool as a liner. This is the rear compartment<figref>23</figref> within the tube <figref>8</figref> educated.

On Center portion of the front wall of the front cover <figref>13</figref> is reset and there is a rectangular opening <figref>13a</figref> for an operator panel <figref>62</figref> educated. In an upper wall of the rear cover <figref>14</figref> is a rectangular opening <figref>14a</figref> educated, to the outlet <figref>8a</figref> belongs, the in said tube <figref>8</figref> is available.

As mentioned won the soundproof housing <figref>2</figref>, the the outer wall of an internal combustion engine driven generator <figref>1</figref> forms, six faces, namely the lower frame member <figref>3</figref>, The center cover <figref>11</figref>. the cover portion <figref>12</figref>, The front cover <figref>13</figref> and the rear cover <figref>14</figref>, The interior of the soundproof case <figref>2</figref> is through the front frame part <figref>5</figref> and the rear frame part <figref>6</figref> in the front compartment <figref>21</figref>, The center compartment <figref>22</figref> and the rear quarter <figref>23</figref> divided.

In addition, within the center compartment, a fan cover <figref>16</figref> available, which also serves as a pipe and tubular to the rectangular portion the tube <figref>7</figref> connects, and the rear frame part <figref>6</figref> out in the center compartment <figref>22</figref> bulges. The fan cover<figref>16</figref> is cylindrical roughly and covers a generator <figref>35</figref> and a centrifugal blower <figref>40</figref> from and has a suction opening <figref>16a</figref>. connected to a circular opening the front side is. On a circular end surface at the suction <figref>16a</figref> are numerous protrusions <figref>16b</figref> With predetermined lengths provided.

The fan cover <figref>16</figref> has a flange <figref>16c</figref>Radially at the open rear end outward extends. From the back is a rectangular frame part<figref>17</figref> at the flange <figref>16c</figref> attached. The rectangular frame part<figref>17</figref> is by a rubber seal <figref>18</figref> surrounded, along the rectangular outer peripheral edge extends and the rectangular tubular portion of the tube <figref>7</figref> sitting, the through the rubber seal <figref>18</figref> is sealed.

The fan cover <figref>16</figref> is about rectangular frame part <figref>17</figref> with the tube <figref>7</figref> the rear frame part <figref>6</figref> connected. The pipe <figref>7</figref> is connected to the tube <figref>8</figref> connected to the the rear frame part <figref>6</figref> after rear arches and the rear compartment <figref>23</figref> forms.

In order to filled within the soundproof case <figref>2</figref> on Tube space surrounded by the fan cover <figref>16</figref>. the tube <figref>7</figref> and the pipe <figref>8</figref> is formed, the rear compartment <figref>23</figref> and a portion of the middle compartment <figref>22</figref>, The tubular space of points the upstream Side a suction <figref>16a</figref> on, in the center compartment <figref>22</figref> opens, and at the downstream side an outlet <figref>8a</figref>. extending in the upper side wall of the tube <figref>8</figref> is. The outlet <figref>8a</figref> shows the rectangular opening <figref>14a</figref> the rear cover <figref>14</figref> and opens in the vicinity of the soundproof case <figref>2</figref>,

At said frame assembly and tube assembly within the soundproof housing <figref>2</figref> are various devices arranged. The internal combustion engine<figref>30</figref> is in the tubes <figref>7</figref> and <figref>8</figref> at the rear of the soundproof case <figref>2</figref> housed, please refer <figref idrefs="S19">4</figref>, It is each of left and right antivibration fixing part <figref>31</figref> supported that the carrying part <figref>3q</figref> on the lower frame member <figref>3</figref> are attached (<figref idrefs="S19">4</figref> and <figref idrefs="S21">6</figref>).

Of the internal combustion engine <figref>30</figref> comprising a crankcase <figref>30a</figref>. please refer <figref idrefs="S21">6</figref>Which is shifted to the left side, a cylinder <figref>30b</figref>Peaking tilted to the right, and a crankshaft <figref>30c</figref>Which horizontally from front to the back extends and protrudes forward.

There the cylinder <figref>30b</figref> the internal combustion engine <figref>30</figref> as mentioned is inclined, you can make a big Space in the pipes <figref>7</figref>. <figref>8</figref> keep clear. In this room is a big cylindrical silencer <figref>32</figref> in the Direction arranged from left to right. The silencer<figref>32</figref> becomes from the internal combustion engine by means of an arm <figref>33</figref> kept. With the silencer <figref>32</figref> is an exhaust pipe <figref>34</figref> connected, which by itself cylinders <figref>30b</figref> after extends above. An exhaust pipe<figref>32a</figref> extends around the silencer <figref>32</figref> around of the right side wall to the rear side. The outlet the exhaust pipe is near the outlet <figref>8a</figref> arranged.

Of the generator <figref>35</figref> is connected to the crankshaft <figref>30c</figref> connected, the forward out of the crankcase <figref>30a</figref> protrudes. The generator <figref>35</figref> is a multi-pole external rotor generator, the external rotor one <figref>36</figref> having, having the shape of a bottomed cylinder, and so on crankshaft <figref>30c</figref> is mounted to move a piece with her forms. On the inside of the peripheral wall of the rotor<figref>36</figref> are along the outer edge numerous magnets <figref>36a</figref> glued, which together with the crankshaft <figref>30c</figref> turn. The external rotor<figref>36</figref> also serves as a flywheel of the engine.

Of the external rotor <figref>36</figref> Has at the front of a bottom wall and opens out to the rear. As stator <figref>37</figref> the generator <figref>35</figref> is on the crankcase <figref>30a</figref> on Stator core fixed, having numerous radially extending Jöcher and generating coils wound on the yokes.

The bottom wall of the outer rotor <figref>36</figref> is with numerous ventilation holes <figref>36b</figref> provided, and the centrifugal <figref>40</figref> is of from on the lower wall of the external rotor <figref>36</figref> attached.

The centrifugal blower <figref>40</figref> is a double-sided blower, which on the front and back of a disc-like baseplate <figref>40a</figref> propeller blades <figref>41</figref>. <figref>42</figref> having. The fan cover <figref>16</figref> covered the generator <figref>35</figref> and the centrifugal <figref>40</figref>. wherein the suction port <figref>16a</figref> at the opposite front the centrifugal <figref>40</figref> lies. The rear end of the fan cover <figref>16</figref> together the rectangular frame portion <figref>17</figref> the crankcase <figref>30a</figref> of internal combustion engine <figref>30</figref> attached.

In front of the fan cover <figref>18</figref> is opposite the suction <figref>16a</figref> on Recoil <figref>45</figref> provided. By the projection <figref>16b</figref> on the end face, the suction port, the <figref>16a</figref> the fan cover <figref>16</figref> surrounds, remains a predetermined space between the recoil starter <figref>45</figref> and of the fan cover <figref>16</figref>, A projection portion <figref>46b</figref> a starter housing <figref>46</figref> of Recoil starter <figref>45</figref> is at the fan cover <figref>16</figref> secured and is in one piece kept.

Of the Recoil <figref>45</figref>. please refer <figref idrefs="S18">3</figref>, Has a ratchet wheel <figref>47</figref>, the is provided on a rotary shaft to the crankshaft <figref>30c</figref> coaxial runs and extends backward. At a center portion of the centrifugal<figref>40</figref> is a ratchet <figref>48</figref> fixed, the ratchet wheel to the <figref>47</figref> faces.

The ratchet <figref>47</figref> is via a gear train <figref>47a</figref> from a starter lever actuated and it is also of a starter motor <figref>49</figref> driven, of on the left side of the starter housing <figref>46</figref> available is.

Becomes the ratchet wheel <figref>47</figref>Which is usually of the ratchet <figref>48</figref> separated is, for example, from the starter motor <figref>49</figref> driven, moves the ratchet wheel <figref>47</figref> rearwardly and engages in the ratchet <figref>48</figref> on. The ratchet<figref>48</figref> turns the crankshaft <figref>30c</figref> and the external rotor <figref>36</figref> powerful, so that the internal combustion engine <figref>30</figref> is started.

The starter housing <figref>46</figref> of Recoil starter <figref>45</figref> Has a conical wall in which a number of slots <figref>46a</figref> educated are circularly are arranged. Through the space between the end face of the fan cover<figref>16</figref> and the starter housing <figref>46</figref> and continue over the slots <figref>46a</figref> cooling air in the suction opening <figref>16a</figref> the fan cover <figref>16</figref> introduced.

Of the Recoil <figref>45</figref> is in the center compartment <figref>22</figref> arranged and each one left and a left vibrationproof fixing part <figref>50</figref> held that the carrying part <figref>3p</figref> on the lower frame member <figref>3</figref> are attached (<figref idrefs="S19">4</figref>. <figref idrefs="S20">5</figref>).

Of the internal combustion engine <figref>30</figref> and the recoil starter <figref>45</figref> are the fan cover <figref>16</figref> to a connected part and form a vibration unit. The internal combustion engine<figref>30</figref> in the rear part is vibration-damping of the fixing part <figref>31</figref> kept. The recoil starter 45 in the front Part is used by the vibrationproof mount member <figref>50</figref> kept. Thereby, the vibration unit effectively held at positions be that close to the front and rear end portions of the Unit are.

There the generator <figref>35</figref> and the recoil starter <figref>45</figref> in front the crankcase <figref>30a</figref> arranged are located on the left side and on the rear compartment <figref>23</figref> and the middle compartment <figref>22</figref> extends, is at the right side of the fan cover <figref>16</figref> and the recoil starter <figref>45</figref> in the center compartment <figref>22</figref> formed a space. are in this room a carburetor <figref>52</figref> and an air filter <figref>53</figref> housed, wherein the air filter <figref>53</figref> is located forward.

Of the silencer <figref>32</figref> is above the internal combustion engine <figref>30</figref> arranged. The fuel tank<figref>55</figref> is in a space above of the fan cover 16, the recoil starter <figref>45</figref>. the carburetor <figref>52</figref> and the air cleaner <figref>53</figref> in the center compartment <figref>22</figref> accommodated.

Of the Fuel tank <figref>55</figref> is of the left and right reinforcing rail <figref>9</figref> carried, between the front frame part <figref>5</figref> and the rear frame part <figref>6</figref> lie, and by means of a flange <figref>55a</figref>, The screws <figref>57</figref> at the rails <figref>9</figref> is mounted, vibration-damping rubber <figref>56</figref> are inserted.

On Part of the fuel tank <figref>55</figref> protrudes above the upper open hole <figref>5b</figref> of front frame part <figref>5</figref> in the front compartment <figref>21</figref> into it. The fuel filler neck <figref>55b</figref> of Fuel Tanks <figref>55</figref> extending through the circular hole <figref>11d</figref> the center cover <figref>11</figref> up. On the top of the fuel filler pipe<figref>55b</figref> is a gas cap <figref>58</figref> screwed.

Of the Fuel tank <figref>55</figref> is in a space outside of the fan cover <figref>16</figref> and the tube <figref>7</figref> accommodated in the center compartment, either together with the devices of the intake system, z. B. the carburetor <figref>52</figref> and the air filter <figref>53</figref>, Parts of the fuel system of the engine<figref>30</figref> are concentrated in a small space. This space is effectively utilized and the device is compact.

in the flat rectangular space of the front compartment <figref>21</figref>, that from the front cover <figref>13</figref> is covered and ahead of the front frame part <figref>5</figref> lies are an inverter circuit <figref>60</figref> and a battery <figref>61</figref> left and right on the lower frame portion <figref>3</figref> arranged. About that There is a control panel <figref>62</figref>That the front rectangular opening <figref>13a</figref> the front cover <figref>13</figref> shows. In front compartment<figref>21</figref> are especially electrical devices Before summarized.

The Inverter circuit <figref>60</figref> constitutes delivery of the multipolar generator <figref>35</figref> in alternating current of a predetermined frequency around. The inverter circuit<figref>60</figref> is on the right Side of the front compartment <figref>21</figref> close to the suction holes <figref>4a</figref>. <figref>4b</figref> arranged, so that it is first cooled by the external air sucked in.

As is described by an internal combustion engine driven generator <figref>1</figref> With the soundproof case <figref>2</figref> so constructed such that the generator <figref>35</figref>, The internal combustion engine <figref>30</figref> and the silencer <figref>32</figref> in disposed in this order, and the tubes <figref>7</figref>. <figref>8</figref> and of the fan cover <figref>16</figref> housed are.

The suction <figref>16a</figref> the fan cover <figref>16</figref> opens in the center compartment <figref>22</figref>, And the centrifugal fan <figref>40</figref> is within the intake port <figref>16a</figref> housed, so that by the rotation of the centrifugal fan <figref>40</figref> Air from the Near the soundproof case <figref>2</figref> about the front compartment <figref>21</figref> in the center compartment <figref>22</figref> is introduced. The air is about the slots <figref>46b</figref> in the starter housing <figref>46</figref> the recoil starter <figref>45</figref>. the space between the fan cover <figref>16</figref> and the starter housing <figref>46</figref> and the intake <figref>16a</figref> in the fan cover <figref>16</figref> imbibed (in <figref idrefs="S19">4</figref> and <figref idrefs="S22">7</figref> the air flows through Dashed arrows shown).

The by propeller blades <figref>41</figref> on the front side of the centrifugal fan <figref>40</figref> about the suction <figref>16a</figref> in the fan cover <figref>16</figref> sucked Air, see <figref idrefs="S22">7</figref>Flows along the inner peripheral surface of the fan cover <figref>16</figref> and the outside the external rotor <figref>36</figref> of Generator 35 to the combustion engine <figref>30</figref>So that the internal combustion engine chilled is. Part of the internal combustion engine<figref>30</figref> flowing air However, by the action of the propeller blades <figref>42</figref> on the back of the centrifugal blower <figref>40</figref> by a space betweentween the generator <figref>35</figref> and the internal combustion engine <figref>30</figref> in the interior of the outer rotor <figref>36</figref> passed, the generator coils to cool, and returns on ventilation holes <figref>36b</figref> in the lower wall of the external rotor <figref>36</figref> in the Circuit for centrifugal <figref>42</figref> back.

The in the internal combustion engine <figref>30</figref> introduced air including said circulation air cools the internal combustion engine and flows subsequently out of the tubes <figref>7</figref>. <figref>8</figref> upwards so that the silencer <figref>32</figref> (<figref idrefs="S19">4</figref>) chilled is. After cooling the silencer <figref>32</figref> becomes the air over the outlet <figref>8a</figref> of soundproof Ge housing <figref>2</figref>. the above the muffler is arranged and discharges into the environment, released into the open.

There the middle compartment <figref>22</figref> about the open communication hole <figref>5c</figref> in the front frame part <figref>5</figref> With the front compartment <figref>21</figref> is connected, is the suction holes <figref>4a</figref>. <figref>4b</figref> out around in the front compartment <figref>21</figref> air drawn in the middle compartment <figref>22</figref> out. Here, the front compartment acts <figref>21</figref> a labyrinth passage for introducing of outside air, the leakage of Sauggeräuschen prevented that the center compartment <figref>22</figref> occur. The inverter circuit<figref>60</figref> is during the suction air from the suction holes <figref>4a</figref>. <figref>4b</figref> arranged, so they effectively cooled is.

Of the generator <figref>35</figref>, The internal combustion engine <figref>30</figref> and the silencer <figref>32</figref>. the heat sources represent, are protected by the fan cover <figref>16</figref> and the pipes <figref>7</figref>. <figref>8</figref> covered, so that they from the other devices are isolated. The by the centrifugal<figref>40</figref> about the suction <figref>16a</figref> in the center compartment <figref>22</figref> into the fan cover <figref>16</figref> sucked air cools First the generator <figref>35</figref>, Of a relatively low temperature Has. subsequently cools the internal combustion engine <figref>30</figref> and the muffler <figref>32</figref>. the higher Temperatures, and is the outlet opening <figref>8a</figref> in the environment ejected. In this way, effective cooling can take place.

There the centrifugal <figref>40</figref> at the external rotor <figref>36</figref> of generator <figref>35</figref> is fixed, can a centrifugal <figref>40</figref> With provide high performance and can be a high bearing strength to accomplish.

There the silencer <figref>32</figref> above the internal combustion engine <figref>30</figref> is arranged such that the hotter device in a higher Position, and the outlet <figref>8a</figref> above the silencer <figref>32</figref> scheduled is, you can get a reasonable designed cooling air flow for a effective cooling produce.

The said ventilation assembly in which the generator <figref>35</figref>, The internal combustion engine <figref>30</figref> and the silencer <figref>32</figref> in placed this order and with the fan cover <figref>16</figref> and the pipes <figref>7</figref>. <figref>8</figref> are covered, is very simple. Since the internal combustion engine <figref>30</figref> behind the generator <figref>35</figref> is arranged, the silencer <figref>32</figref> above the internal combustion engine <figref>30</figref> is arranged and of the tubes <figref>7</figref>. <figref>8</figref> formed Cooling air passage L-shaped bent is, can the size of the soundproof housing <figref>2</figref> in the keep the direction of the backward small and the space in the soundproof case <figref>2</figref> effective exploit, so that the other devices and the motor-driven generator can be made compact.

There the generator <figref>35</figref> an external rotor-generator and the external rotor <figref>36</figref> as Flywheel of the combustion engine <figref>30</figref> acts, need no other flywheel mount, and the size of the motor-driven generator in the axial direction (front to rear) may be low. Since the inverter <figref>60</figref> the delivery of the multipolar generator <figref>35</figref> in converts an alternating current at a predetermined frequency, you can the size of the generator even minimize axially.

There additionally the cylinder <figref>30b</figref> the internal combustion engine <figref>30</figref> to inclined side and the muffler <figref>32</figref> placed over is, it can be the vertical dimension of the engine operated generator keep small and a silencer <figref>32</figref> With greater capacity provide.

Of the internal combustion engine <figref>30</figref> as a noise source is double covered, and through a tube extending from the tube <figref>7</figref> and the Glass wool pipe <figref>8</figref> composed, and by the soundproof housing <figref>2</figref> at the outside of the tube so that one can obtain a high sound damping effect.

There the delivery of the multipolar generator <figref>35</figref> into an alternating current is reacted with a predetermined frequency, it takes the speed independently not to keep the load constant, so that the output frequency remains constant, as is the case with a synchronous generator, the commonly is used in this type of motor-generator. In order to you can at light loads to reduce the speed and reduce the operating noise greatly.