Overdrive for motor vehicles
AssigneeAB Volvo
InventorsStig H. A. Weiertz, Grzegorz K. Janiszewski
Life of this patent
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Abstract
A planetary-type overdrive for motor vehicles in which, when engaged, the sun pinion is fixed relative to the housing by means of a completely disengageable one-way clutch when torque is transmitted from the input shaft to the output shaft. Free-wheeling is achieved when torque is transmitted in the opposite direction. A brake device is coupled between the one-way clutch part joined to the sun pinion and the overdrive housing. When shifting from direct drive to overdrive, the sun pinion is braked before the one-way clutch is engaged, i.e. before its blocking function is established.
Claims7
In an overdrive for motor vehicles, comprising a housing for the overdrive, a planet carrier which is joined to an input shaft, a ring gear with internal teeth, which ring gear engages planet pinions carried on the planet carrier and is joined to an output shaft, a sun pinion engaging the planet pinions, a one-way brake coupled between the housing of the overdrive and the sun pinion, said one-way brake being arranged to lock the sun pinion to the housing when driving torque is transmitted from the input shaft to the output shaft, and a clutch which is disposed, when engaged, to establish non-rotatable connection between the sun pinion and the ring gear, and means to suspend the braking function of the one-way brake before the clutch is engaged;
- the improvement comprising brake means that brake the sun pinion after disengagement of the clutch and prior to the establishment of the braking function of the one-way brake.
Dependencies are inferred from the claim text.