192 clutches and power-stop control – Transmission and brake – Motor vehicle
Reexamination Certificate
2000-12-15
2002-10-22
Rodriguez, Saul (Department: 3681)
192 clutches and power-stop control
Transmission and brake
Motor vehicle
C188S031000
Reexamination Certificate
active
06467600
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Korea patent Application No. 99-66740, filed on Dec. 30, 1999.
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a parking mechanism for a vehicle equipped with an automatic transmission.
(b) Description of the Related Art
Typically, automatic transmissions for vehicles use planetary gear mechanisms or continuously variable gear mechanism as driving torque transmission means. Such an automatic transmission is selected and placed into any desired range, such as forward ranges, a reverse range, a neutral range and a parking range, by means of a shift lever manipulated by a driver. A selection of parking range causes a parking mechanism to lock a transmission shaft of the automatic transmission.
FIG. 6
schematically shows a conventional parking mechanism. This parking mechanism comprises a detent plate
100
rotated by operation of a shift lever (not shown), a push rod
102
operated by the detent plate
100
, a cam
104
formed at one end of the push rod
102
so as to move in a rectilinear direction along a guide
106
by the push rod
102
, a parking sprag
108
which is pivotally mounted to a transmission housing (not shown) and contacts the cam
104
at its one end, and an annulus gear
112
having teeth
114
that engage a tooth
110
formed at the other end of the parking sprag
108
to lock the transmission.
Once the shift lever is manipulated to be located at P range, the push rod
102
moves in a rectilinear direction such that the cam
104
pushes up a proximal end of the parking sprag
108
and pushes down a distal end of the parking sprag
108
. Accordingly, the parking sprag
108
is engaged with the annulus gear
112
, thereby locking the transmission.
As described above, the conventional parking mechanism requires a large number of parts, i.e., the parking sprag, the annulus gear, the push rod, and the cam, etc. Furthermore, the number of parts occupies a lot of space so mounting problems occur.
Also, it is likely that the parking sprag can become disengaged from the annulus gear by an exterior impact when the vehicle is parked on a steep slope.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above problems of the prior art.
It is an object of the present invention to provide an improved parking mechanism capable of minimizing space occupancy as well as whole manufacturing costs by reducing parts and ensuring reliable parking operation even on a steep slope.
To achieve the above object, a parking mechanism for an automatic transmission of the present invention comprises a manual control shaft rotationally supported by a transmission housing, the manual control shaft cooperating with a shift lever, a detent plate mounted on the manual control shaft, an annulus gear formed on a transfer gear of the transmission, and a sprag interposed between the detent plate and the annulus gear, the sprag levering on a fulcrum shaft which is fixed to the transmission housing.
REFERENCES:
patent: 3001618 (1961-09-01), McCordic et al.
patent: 3300001 (1967-01-01), Stockton
patent: 3491862 (1970-01-01), Tanzer
patent: 3703941 (1972-11-01), Ohie et al.
patent: 6279713 (2001-08-01), Young et al.
Hyundai Motor Company
Rodriguez Saul
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