192 clutches and power-stop control – Clutches – Plural clutch-assemblage
Reexamination Certificate
2000-05-23
2001-10-23
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Plural clutch-assemblage
C192S070200, C192S083000, C192S10900B
Reexamination Certificate
active
06305517
ABSTRACT:
TECHNICAL FIELD
This invention relates to assembly structures for power transmissions and more particularly to locating ring and groove structures
BACKGROUND OF THE INVENTION
Many of the power transmissions in use today have a plurality of stationary torque transmitting mechanisms or brakes which are operated to establish one or more gear ratios in the transmission. Each of the torque transmitting mechanisms has a backing plate that is positioned in a transmission housing by a locating ring and groove structure. The locating ring cooperates with a wall of the groove to determine the axial position of the backing plate when the torque transmitting mechanism is engaged.
In some of the power transmissions, the backing plates are positioned in the housing in axial adjacent relation. In these instances it has been common practice to use a single locating ring to establish the operating position of the backing plates. However, when the torque transmitting mechanisms are engaged and disengaged to control sequential gear ratios, the axial movement of the backing plates can produce a disturbance in the torque transmission during a ratio interchange.
During the ratio interchange, the backing plate of the oncoming torque transmitting mechanism is being urged against the locating ring as the torque capacity of the oncoming torque transmitting mechanism is increasing. However, the backing plate of the offgoing torque transmitting mechanism will also be applying a force to the locating ring that is opposite the force of the oncoming torque transmitting mechanism. Since some assembly tolerance is present between the locating ring and the groove side walls the locating ring will move axially during the ratio interchange as the force balance on the locating ring changes.
This axial movement of the locating ring can disturb the shift timing by effectively increasing the fill time of the oncoming torque transmitting mechanism and prevent the offgoing torque transmitting mechanism from exhausting at the design rate. As a result of the axial movement of the locating ring, the torque transmitting mechanisms can experience excess overlap time during the ratio interchange or reduced capacity of the oncoming torque transmitting mechanism which results in a slight speed flare of the power source. The later of these undesirable episodes can affect the adaptive algorithms of the electronic control system that continually monitors and corrects the ratio interchange timing.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved locating ring and groove structure for axially stacked torque transmitting mechanisms in a power transmission.
In one aspect of the present invention, an L-shaped groove is formed in a transmission housing. In another aspect of the present invention, a pair of locating rings is disposed in the L-shaped groove. In yet another aspect of the present invention, the locating rings consist of a narrow ring and a wide ring.
In still another aspect of the present invention, the narrow locating ring is aligned to contact the backing plate of one torque transmitting mechanism. In yet still another aspect of the present invention, the wide locating ring is aligned to contact the backing plate of the other torque transmitting mechanism. In a further aspect of the present invention, the backing plate of the one torque transmitting mechanism has an annular extension aligned with the narrow locating ring. In a yet further aspect of the present invention, the backing plate of each torque transmitting mechanism is axially moveable without interference from the locating ring of the other torque transmitting mechanism.
REFERENCES:
patent: 3772940 (1973-11-01), Ohtsuka et al.
patent: 6193042 (2001-02-01), Kempf et al.
patent: 58-207533 (1983-12-01), None
Bonck Rodney H.
General Motors Corporation
Hargitt Laura C.
Hodges Leslie C.
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