Load control device

0001The invention relates to a load adjusting for the performance of a Engine defining, in particular designed as a throttle valve, arranged on a control shaft actuator, the control shaft a rotatably connected with its control part by means of a reversible Adjusting gear between a minimum load position and a full-load is pivotally drivable, with a preloaded return spring, the Actuating shaft acted in minimum load direction, and an emergency operation, by the movable control shaft in full-load direction up to an emergency position is.

0002Such load adjusting, for example, from EP 0378737 B1. This load adjusting has to drive the adjusting gear one attached to an accelerator pedal the throttle cable and an electric motor. The throttle cable is pivoted an affiliate of the stem first control element part, while the electric motor A with the first control element part coupled second control part is pivoted. The dimensions of the Control Parts form the gear ratio of the transmission mechanism. The return spring moves the first control unit to the minimum load position, arranged during the emergency operation of the second control element part and said actuating shaft in energized electric motor in the emergency position biases. The return spring and the emergency operation are here as a train or Compression springs designed. The emergency-running position allows the motor vehicle to drive out of the hazardous area when the load adjusting due to a failure of the control electronics or not adjusting gear can be adjusted by operation of the accelerator pedal. In the emergency position has the internal combustion engine, a sufficiently large torque to the motor vehicle is moving at low speed.

0003A disadvantage of the known load adjusting that they very a requires large space. In particular, by the attack of the return spring and make the emergency operation to control parts of these in the radial direction of the adjusting shaft very expansive.

0004It has already been thought of, in place of the return spring and the emergency-running provide a single torsion spring. However, this requires a high constructive effort and costly installation of load adjusting.

0005The invention is based on the problem, a load adjusting the to make the aforementioned type so that it particularly cost is to assemble and particularly small radial dimensions requires.

0006This problem is inventively solved in that the emergency operation and the return spring are each designed as torsion springs and on the Adjusting gear opposite side of the stem are arranged.

0007Due to this design the actuating mechanism requires no vacancies for Attack points of the two springs. Thereby, the actuating mechanism can be particularly make compact. The design of the emergency-running spring and the return spring respectively as torsion springs also results in a reduction of the Dimensions of the load adjusting invention in the radial Direction of the adjusting shaft. The separation of the two springs of the actuating mechanism also leads to a particularly simple mounting of the invention Load adjusting. The type of drive of the actuating gear is this inconsequential. The actuating mechanism may thus for example also exclusively are driven by an electric motor.

0008The emergency operation and the return spring may for example each as Spiral spring be designed. To further reduce the dimensions of the Load adjusting invention in the radial direction of the control shaft it contributes, however, when the emergency-running spring and the return spring as two mutually enclosing the actuating shaft in the opposite direction biasing Torsion springs are designed.

0009For further simplification of the design structure of the invention Load adjusting device carries a lever for transmitting forces the return spring and the emergency-running on the actuating shaft at. The control lever can be positively connected to the adjusting shaft in this case, so that it at the assembly can easily be fitted to this.

0010A second control element part as in the known load adjusting apparatus can be according to another advantageous development of the invention, simply avoided if the emergency operation in emergency position fixed to the housing at a Stop and abuts an angled portion of the actuating lever.

0011This act between the emergency position and the full-load only Forces of the actuating gear and the return spring on the actuating shaft. In between the minimum load position and the emergency operation function the emergency operation and the return spring opposite.

0012A loosening of the return spring of the ball lever can be according to another simply avoid advantageous development of the invention, when a Leg of the return spring is positively connected with the ball lever. This reliably prevents the case of a failure of the drive the adjusting gear, the stem remains in the full load position.

0013The load adjusting device according to the invention requires particularly low Restoring forces when the actuator lever in an emergency-running position of the return spring has against a leg of the emergency-running spring biased bend. Since the return spring and the emergency operation for opposing bias the actuating shaft are arranged, thereby is between the emergency position and the full-load position only the return spring is engaged with the Lever. act between the emergency position and the minimum load position the two springs in opposite directions so that here particularly low Actuating forces for pivoting the control shaft are required.

0014To further reduce the dimensions of the invention Load adjusting device in the radial direction of the adjusting shaft carries on it when the emergency-running spring and the return spring concentrically around a bearing of the Actuating shaft are arranged.

0015leaves a pollution of the springs facing end of the actuating shaft simply according to another advantageous development of the invention, avoided if the emergency-running spring and the return spring in one of a Cover sealable box-like housing arranged.

0016The emergency operation could be arranged on the ball lever that they when pivoting the actuating shaft of the emergency position toward the minimum load position will be stretched further than the return spring. to further simplification of the design structure of the invention Load adjusting it contributes, however, when the emergency operation a greater Spring constant than the return spring.

0017The invention permits numerous embodiments. For further clarification its basic principle, one of them shown in the drawings and is described below.

0018Show it:<dl tsize="8"><dt>Figur1:</dt><dd>a longitudinal section through a throttle body with a load adjusting invention,</dd><dt>Figur2:</dt><dd>a sectional representation through the throttle body of Figure 1 along the line II - II.</dd></dl>

00191 shows a throttle body 1 with an inventive Load adjusting device 2 in longitudinal section. In the throttle body 1 is pivotally mounted a one channel 3 penetrating stem. 4 On the adjusting shaft 4 is for controlling a free cross-sectional area of ​​the Channel serving throttle 5 attached. The actuating shaft 4 is supported by a arranged in a pot-shaped housing 6 of the throttle body 1 Adjusting gear 7 pivots. Further, in the housing 6 a 8 control electronics for driving an electric motor shown in Figure 2 9 arranged. With the electric motor 9 can be the actuating mechanism 7 driving and thus pivot the actuating shaft. 4 Alternatively, the Actuating mechanism 7 of course in addition to the electric motor 9 or be moved instead to a throttle cable, not shown.

0020The throttle body 1 has for the actuating shaft 4 two bearings 10, 11. At the the adjusting gear 7 opposite end of the actuating shaft 4 12 is attached an adjusting lever. To the bearing 11 of this end of the Actuating shaft 4 are an emergency-running spring 13 and a return spring 14 concentrically arranged. The return spring 14 and the emergency-running spring 13 are respectively designed as torsion springs and are arranged in a shaft-like housing 15th The housing 15 is closed by a cover 16th

00212 shows the throttle body 1 of Figure 1 in a sectional view along the line II - II. It can be seen that the actuating lever 12 is made as a sheet metal part and has bends 17, 18th respectively a leg 19, 20 of the emergency-running spring 13 and the return spring 14 are in the throttle body 1 attached. One of the angled sections 18 is of a leg 21 of the return spring 14 engaged behind. The other angling 17 is applied to a second leg 22 of the emergency-running thirteenth Furthermore, it can be seen that the restoring spring 14 the actuating shaft 4 opposite clockwise pivoted, while the emergency operation 13 only in Clockwise to exercise acting restoring forces on the actuator shaft. 4 Since the Emergency-running spring 13 has a greater spring constant than the return spring 14, , the adjusting shaft 4 only to the drawn by the restoring spring 14 Position will be pivoted in the one of the angled portions 17 of the actuating lever 12 abuts the emergency operation. 13 In this position the actuating shaft 4 the second leg 22 of the emergency-running spring 13 is also at a stop 23 to the throttle body 1, so that the actuating shaft 4 by the emergency-running 13 can not be further moved in clockwise direction. This position featuring the emergency position of the load adjusting 2, the is inevitably reached when no actuating forces shown on the in Figure 1 Adjusting gear 7 act on the control shaft. 4 A deflection of the Actuating shaft 4 from the indicated emergency position is therefore only through the possible in Figure 1 shown adjusting gear. 7

LIST OF REFERENCE NUMBERS

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0022<dl tsize="4" compact="compact"><dt>1.</dt><dd>throttle body</dd><dt>. 2</dt><dd>load adjusting</dd><dt>. 3</dt><dd>channel</dd><dt>. 4</dt><dd>actuating shaft</dd><dt>. 5</dt><dd>throttle</dd><dt>. 6</dt><dd>cup-shaped housing</dd><dt>. 7</dt><dd>actuating mechanism</dd><dt>8th.</dt><dd>control electronics</dd><dt>. 9</dt><dd>electric motor</dd><dt>10th</dt><dd>storage</dd><dt>11th</dt><dd>storage</dd><dt>12th</dt><dd>lever</dd><dt>. 13</dt><dd>emergency operation</dd><dt>14th</dt><dd>Return spring</dd><dt>15th</dt><dd>shaft-like housing</dd><dt>16th</dt><dd>cover</dd><dt>17th</dt><dd>angulation</dd><dt>18th</dt><dd>angulation</dd><dt>19th</dt><dd>leg</dd><dt>20th</dt><dd>leg</dd><dt>21st</dt><dd>leg</dd><dt>22nd</dt><dd>leg</dd><dt>23rd</dt><dd>stop</dd></dl>