192 clutches and power-stop control – Transmission and brake – Motor vehicle
Patent
1998-09-11
1999-10-12
Lorence, Richard M.
192 clutches and power-stop control
Transmission and brake
Motor vehicle
744115, 74577S, 188 31, B60T 106, B60K 4126
Patent
active
059643358
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a parking apparatus of an automatic transmission.
2. Description of Related Art
Hitherto, a vehicle having an automatic transmission mounted thereon has a structure in which a torque generated by operating an engine is transmitted to the transmission through a torque converter. Then, the torque is converted by the transmission, and then the converted torque is transmitted to drive wheels. In this case, unlike the vehicle provided with a manual transmission, the vehicle cannot be kept stopped by the gear position (the gear ratio) selected to stop the vehicle and inertia of the engine.
Therefore, a method has been employed in which a parking pole is rotated in synchronization with the operation of a shift lever when the parking range has been selected by operating the shift lever. Thus, a claw provided for the parking pole and a tooth space of the parking gear connected to an output shaft of the automatic transmission are engaged to each other so that the output shaft is locked (refer to Japanese Patent Laid-Open No. 61-41622).
FIG. 1 is a front view showing a conventional parking apparatus of an automatic transmission. FIG. 2 is a side view showing the conventional parking apparatus of the automatic transmission.
Referring to FIGS. 1 and 2, the parking apparatus of the automatic transmission incorporates a rod 83 arranged to be moved forwards/reversely (from side to side in FIG. 2) by a detent lever (not shown); a cam 84 slidably disposed along the rod 83 at a predetermined position thereof so as to convert linear motion into rotational motion; a parking pole 87 having a claw 94 in the substantially central portion thereof and arranged to be swung when the cam 84 is moved forwards or reversely; and a parking gear 66. The leading end of the parking pole 87 is supported by the cam 84.
The parking gear 66 is connected to an output shaft (not shown) so that the parking gear 66 is rotated in a direction indicated by an arrow A when the vehicle is moved forwards. When the vehicle is moved in reverse, the parking gear 66 is rotated in a direction indicated by an arrow B. The parking pole 87 is supported swingably about the pole shaft 93. When the parking pole 87 is rotated in a direction indicated by an arrow C, the parking pole 87 causes the claw 94 and a tooth space 62 of the parking gear to be engaged to each other. When the parking pole 87 is rotated in a direction indicated by an arrow D, the claw 94 and the tooth space 62 are disengaged. The pole shaft 93 is provided with a torsion spring (not shown) so that the parking pole 87 is urged in the direction indicated by the arrow D.
The detent lever is connected to a manual shaft (not shown) arranged to be rotated in synchronization with the operation of a shift lever (not shown) disposed in a driver's seat. The detent lever formed as a plate-like member arranged to be rotated about the manual shaft has a plurality of engagement grooves corresponding to the shifting positions of the shift lever formed in the peripheral portion thereof. The leading end of a detent spring (not shown) can be engaged to any one of the engagement grooves. Therefore, when the shift lever is operated and thus the detent lever is rotated, the rod 83 is moved forwards or reversely to follow the rotation of the detent lever.
A compression spring 85 is provided for the rod 83 at a position to rearward (at a right-hand position in FIG. 2) of the cam 84. The cam 84 has a conical surface formed into two steps and having a vertex facing the front end of the rod 83.
When the rod 83 has been moved forwards (to the left in FIG. 2), the cam 84 is introduced into a position between a bracket 95 and the parking pole 87 so the parking pole 87 is moved upwards and rotated in the direction indicated by the arrow C. When the rod 83 has been moved reversely (to the right in FIG. 2), the cam 84 is separated from the position between the bracket 95 and the parking pole 87. Thus, the parking pole 87 is rotated in the direction indic
REFERENCES:
patent: 3990541 (1976-11-01), Dobrinka et al.
patent: 4200002 (1980-04-01), Takahashi
patent: 4576261 (1986-03-01), Barr
patent: 5365804 (1994-11-01), Downs et al.
patent: 5526909 (1996-06-01), Ohkawa et al.
Fukumura Kagenori
Hojo Yasuo
Hongoya Akihito
Kuroyanagi Akihiro
Miyata Hideki
Aisin Aw Co. Ltd.
Lorence Richard M.
Toyota Jidosha & Kabushiki Kaisha
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