Brakes – Wheel – Positive lock
Reexamination Certificate
1999-10-06
2001-09-11
Oberleitner, Robert J. (Department: 3613)
Brakes
Wheel
Positive lock
C188S031000, C192S220200, C074S473280
Reexamination Certificate
active
06286633
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a parking brake and more particularly to a parking brake for an automatic transmission mechanism.
2. Description of the Prior Art
Generally, a vehicle mounted with an automatic transmission mechanism is established with a transmission range covering parking (P), reverse driving (R), neutral (N), driving (D) and the like.
When a change lever at the transmission range is positioned at a parking range, an output axle is mechanically restricted to allow a vehicle to maintain a parking state, but in order to maintain the parking state a separate parking mechanism is needed.
As illustrated in
FIGS. 4 and 5
, the separate parking mechanism includes a change lever assembly
51
where a change lever
50
is so disposed as to be movable to each range, a manual lever
54
protrusively disposed at a transmission case
52
and internally connected by a detent plate
53
, a control cable
55
connecting the change lever assembly
51
and the manual lever
54
, a parking rod
56
connected at one end thereof to the detent plate
53
for slideable movement, a parking lever
58
connected at one end thereof to the parking rod
56
for rotation by way of a hinge shaft
57
and a parking gear
60
intermittently restricted by the parking lever
58
and so mounted as to be cooperatively connected to an output shaft
59
.
Furthermore, the parking lever
58
is provided with a spring
61
which is supported at one end thereof by a fixed portion and is connected thereto at the other end thereof, such that the parking lever
58
is always detached from the parking gear
60
to apply resilience thereto.
In other words, the parking lever
58
is rotatably moved to intermittently restrict the parking gear
60
, and when the parking gear
60
is restrained, the output shaft
59
is put to a restricted state to allow a vehicle to maintain the parking.
Now, operation of the parking brake mechanism thus described will be explained.
When a driver shifts the changer lever
50
to a parking (P) position to park a vehicle, the control cable
55
rotates the manual lever
54
and simultaneously rotates the detent plate
53
connected thereto. When the detent plate
53
is rotated, the parking rod eccentrically connected thereto is moved to the right direction on the FIG.
4
.
When the parking rod
56
is moved to the right side, the parking lever
58
adhered to a tip end of the parking rod
56
is rotated clockwise about the hinge shaft
57
, where a tip end of the parking lever
58
is inserted into gear grooves of the parking gear
60
. When the parking lever
58
is inserted into the gear grooves of the parking gear
60
to thereby prevent the parking gear
60
from rotating, the output shaft
59
where the parking gear
60
is fixedly disposed is refrained from rotating, thereby causing the vehicle to maintain the parking state.
SUMMARY OF THE INVENTION
However, there is a problem in that, when the control cable activates the parking rod and the parking lever according to movement of the change lever as described above, heavy impact is generated on the parking lever and the parking gear when the change lever is shifted to the parking range by a driver during change lever manipulation while the vehicle is running, and still worse, the automatic transmission mechanism can be damaged to make the vehicle inoperable.
Furthermore, an operating direction of the parking lever is on a straight line relative to a rotating direction of the parking gear, such that, when the parking gear is rotated by a relatively strong force such as sudden start (due to erroneous operation of the automatic transmission mechanism) and the like, the parking lever resiliently supported by a spring is detached from the gear grooves of the parking gear to thereby cause an accident to occur.
The present invention is disclosed to solve the aforementioned problem and it is an object of the present invention to provide a parking brake for automatic transmission mechanism configured not to affect the operation of the automatic transmission mechanism even though the change lever is positioned at a parking range while the vehicle is running, thereby preventing noise and damage.
Furthermore, the output shaft is firmly secured even when a vehicle mounted with an automatic transmission mechanism is started suddenly, such that a braking force is increased while the vehicle is parked to thereby maintain a parking state of the vehicle.
In accordance with the object of the present invention, there is provided a parking brake for automatic transmission mechanism, the brake adapted to restrict an output shaft according to a change lever at the automatic transmission mechanism being selectively positioned at a parking range to thereby generate a braking force while a vehicle is parked, wherein the brake comprises:
a first roller fixedly disposed to cooperatively rotate with the output shaft;
a second roller coaxially movable with the first roller but disposed not to rotate;
restricting means disposed at a facing surface between the first roller and the second roller to restrict the rotation of the first roller when the first and second rollers are closely adhered; and
diving means for slidingly moving the second roller according to selection and non-selection of the change lever to the parking position to couple and detach the first and second rollers.
REFERENCES:
patent: 3822768 (1974-07-01), Sebulke
patent: 4907681 (1990-03-01), Kuusik et al.
patent: 5704457 (1998-01-01), Kimura et al.
patent: 5954179 (1999-09-01), Osborn
Birch & Stewart Kolasch & Birch, LLP
Hyundai Motor Company
Oberleitner Robert J.
Rodriguez Pamela J.
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