Planetary gear box of the Simpson-set type.

p0001The invention relates to a planet wheel change gear in the form of a Simpson-set, the type described in the preamble of claim.

p0002From DE-OS 34 17 703 multi-course, switchable via a hydra uliches control valve system hydrokinetic mechanical change gear for motor vehicles is known, in which the main part of the planet wheel change gear is in the form of a Simpson set. The input member of the Simpson set comprises two couplings CL₂ and CL₃ with which the drive is selectively connectable to the common sun or with the ring gear of the forward movement during an operation in the forward gears. The Simpson-set also includes two brakes B₂ and B₃ to set the common sun gear during operation in second gear or the planet carrier of the rear set during operation in first gear and the reverse gear and also has an overrunning OWC₂ parallel to the brake B₃ to produce a drive connection in the first gear in one direction only. The planet carrier of the forward set and the ring gear of the rear set of the Simpson set here are drivingly connected to the drive shaft.

p0003In this known planetary gears manual transmission in the form of a Simpson set the front portion of the output shaft is adjacent provided the common sun with a central bore and radial bores for lubricating oil supply of bearings on the output shaft via bearing bushes common sun gear and engaged with the planet wheels.

p0004This center bore of the output shaft in conjunction with the plurality of radial bores represents a significant weakening of the driven shaft so that they can only transmit a certain torque range. In contrast, the stresses occurring in the remaining elements of the Simpson set are not so high, that is, they would be transferred to a larger torque range at a particular interpretation able.

p0005The object of the invention is, starting from a transmission that initially designed to transmit a certain torque range of, for example, to 450 Newton meters while retaining as many components of the planet wheel change gear in the form of a Simpson-rate for the transmission of a higher torque range up to 750 to make Newton meters suitable.

p0006According to the invention this object is achieved by a planet wheel change gear in the form of a Simpson-rate as explained in the preamble of claim type comprising the combination of the indicated in the characterizing part partly known features.

p0007Characterized in that the ring gear of the front planetary gear is connected by a spline with an annular hub and carried on a shoulder on the planet gear carrier of the forward set and stored, connected to the planet carrier of the rear set of a flange via a spline with the brake drum of the brake B₃ and this via overrunning OWC₂ is guided and supported by side bearings on an approach of the housing extending common sun of the Simpson set comprises between the front planetary carrier and the ring wheel hub of the rear set no radial bearing bushes, the drive shaft in the area of ​​the common sun gear no central hole and has no radial holes and the lubricating oil supply of the Simpson set via axial bores in the ring wheel hub of the rear set on an inserted into the annular hub conical hopper for free annular space between the output shaft and the floating mounted only outside via the Plant wheels, the common sun gear takes place, may to the output shaft of a without the need for the outer diameter of the output shaft would have to be provided to transmit higher torque range corresponding larger cross-section can be increased. This allows the rest of the gear elements of the Simpson set are unchanged in dimension substantially. Also the gear housing for the amplified transmission may substantially coincide with the transmission housing of the predetermined transmission.

p0008The invention is illustrated with reference to an embodiment shown in the accompanying drawings. It shows the figure a partial vertical section through a planet wheel change gear in the form of a Simpson-set with the inventive combination of storage measures of the individual elements.

p0009A drive member 1, which is either connected with a three-course hydrokinetic-mechanical change gear for motor vehicles with the turbine shaft of a hydrokinetic torque converter or connected in the case of a four-speed, hydrokinetic-mechanical change gear for motor vehicles with a gear set with the output member of the planetary gear set is impulsive with the input element 2 of the Simpson set 3 connected the output element 4 is operatively connected to the drive shaft 5 of the transmission.

p0010The input element 2 in this case forms parts of two multi-plate clutches CL₂ and CL₃ which are operable respectively in a known manner via fluid-operated piston assemblies, and that of the drive element 1 via the input element 2, optionally with the common sun gear 6 of the two planetary gearsets 7 and 8 or with the ring gear 9 front set 7 connect during an operation in the forward gears.

p0011The ring gear 9 of the front set 7 is connected via a spline 10 having a hub ring 11 which is guided on a shoulder of the planet carrier 12 of the front set and stored, which is connected by a spline 13 to the output shaft fifth

p0012The Simpson-set 3 has two brakes B₂ and B₃, wherein the brake B₂ the common sun can be 6 determined during operation in second gear and by means of the brake B₃ the planet carrier 14 of the rear set 8 during an operation in first gear and can be set in reverse. The planet carrier 14 is centered over a spline 15 with the brake drum 16 of the brake B₃ connected, which is again supported on the side of the overrunning clutch OWC₂ arranged bearing rings 17 centrally on an inner ring 18 which is arranged on a projection 19 of the gear housing 20th

p0013The ring gear 21 of the rear set 8 is connected via a spline 22 having a hub ring 23, which is connected by a spline 24 to the output shaft fifth The ring gear 21 with the ring wheel hub 23 forms the output element 4 of the Simpson set. 3

p0014Due to the good central arrangement of the planet carrier 12 of the front protrusion 7 and the exact accordance with the invention centric supporting the planet carrier 14 of the rear set 8, the common sun gear 6 can be freely supported only via the engaged with him planet gears. The arrangement of usual radial bearing bushes can be omitted here. The lubricating oil supply of the Simpson gearset 3 can now via axial bores 25 in the ring wheel hub 23 carried, with an inserted into the annular hub 23 of conical funnel 26, the lubricating oil into the space 27 between the output shaft 5 and the common sun gear 6, from where it via radial holes 28 is guided in the common sun gear 6 radially outward, so that the planetary gear sets may be 7 and 8 is supplied with its thrust washer assemblies sufficiently with the lubricating oil.

p0015The required output shaft in the central bore 5 with radial bores that were previously required for the supply of lubricant can thus be dispensed with and the output shaft 5 can be used with a constant outer diameter for transmitting a higher torque range.