US3690416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parking brake for automatic transmission
Assignee: Nissan Motor Co Ltd
•
Filing: 1970-07-17
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Granted: 1972-09-12
•
Expires: 1990-07-17
Abstract
Abstract A parking brake for use with an automatic power transmission mechanism including a parking gear which is engaged or disengaged by a brake pawl upon manual shifting motion of a control rod. A cam portion is carried by the control rod and is moved to cause the brake pawl to engage and disengage in the parking position with a stationary housing. Intermediate members such as rollers or balls are situated in a spaced defined between the brake pawl and the cam portion and/or between the cam portion and the stationary housing in order to minimize the driver''s effort which is necessary to control the motion of the control rod.
Inventors
- 👤 Katsuo Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:22
CPC Classifications
B; B60; B60T; B60T1/00; B60T1/005; F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/34; F16H63/3416
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
292 words
A parking brake for an automatic transmission mechanism of a motor vehicle, comprising in combination: 1. an output shaft of the transmission mechanism rotatably journaled in a stationary housing of the vehicle; 2. a toothed parking gear secured to said output shaft for rotation therewith; position, as 3. a toothed brake pawl having a heel portion formed thereon and mounted on said stationary housing for oscillation into and out of meshing engagement with said parking gear to prevent rotation thereof; 4. a control rod adapted to be manually shifted for movement in a direction generally parallel to the axis of said output shaft; 5. a cam portion carried by said control rod and having a cam surface formed thereon; 6. intermediate means including rotatable means disposed in at least one of the spaces formed in the heel portion of said brake pawl and between said cam portion of said control rod and said stationary housing, and reaction means having a cam surface formed thereon and disposed in the other of said spaces, both of said rotatable means and the cam surface of said reaction means being shaped and sized to keep abutting engagement with the cam surface of said cam portion thereby reducing operational frictions effected therebetween upon movement of said cam portion with respect to said intermediate means; and 7. spring means for biasing either of said cam portion, rotatable means and reaction means in such a direction that said brake pawl is kept out of meshing engagement with said parking gear, whereby upon manual shifting of said control rod said cam portion is yieldably moved against the biasing action of said spring means to its parking position in which said parking gear is in meshing engagement with said brake pawl.
Claim 2
Dependent Claim
292 words
A parking brake for an automatic transmission mechanism of a motor vehicle, comprising in combination: 1. an output shaft of the transmission mechanism rotatably journaled in a stationary housing of the vehicle; 2. a toothed parking gear secured to said output shaft for rotation therewith; position, as 3. a toothed brake pawl having a heel portion formed thereon and mounted on said stationary housing for oscillation into and out of meshing engagement with said parking gear to prevent rotation thereof; 4. a control rod adapted to be manually shifted for movement in a direction generally parallel to the axis of said output shaft; 5. a cam portion carried by said control rod and having a cam surface formed thereon; 6. intermediate means including rotatable means disposed in at least one of the spaces formed in the heel portion of said brake pawl and between said cam portion of said control rod and said stationary housing, and reaction means having a cam surface formed thereon and disposed in the other of said spaces, both of said rotatable means and the cam surface of said reaction means being shaped and sized to keep abutting engagement with the cam surface of said cam portion thereby reducing operational frictions effected therebetween upon movement of said cam portion with respect to said intermediate means; and 7. spring means for biasing either of said cam portion, rotatable means and reaction means in such a direction that said brake pawl is kept out of meshing engagement with said parking gear, whereby upon manual shifting of said control rod said cam portion is yieldably moved against the biasing action of said spring means to its parking position in which said parking gear is in meshing engagement with said brake pawl.
Claim 3
Dependent Claim
14 words
a toothed parking gear secured to said output shaft for rotation therewith; position, as
Claim 4
Dependent Claim
14 words
a toothed parking gear secured to said output shaft for rotation therewith; position, as
Claim 5
Dependent Claim
18 words
A parking brake according to claim 1, wherein said cam portion is formed integral with said control rod.
Claim 6
Dependent Claim
19 words
A parking brake according to claim 1, wherein said cam portion is adapted to reciprocate on said control rod.
Claim 7
Dependent Claim
32 words
a toothed brake pawl having a heel portion formed thereon and mounted on said stationary housing for oscillation into and out of meshing engagement with said parking gear to prevent rotation thereof;
Claim 8
Dependent Claim
32 words
a toothed brake pawl having a heel portion formed thereon and mounted on said stationary housing for oscillation into and out of meshing engagement with said parking gear to prevent rotation thereof;
Claim 9
Dependent Claim
22 words
a control rod adapted to be manually shifted for movement in a direction generally parallel to the axis of said output shaft;
Claim 10
Dependent Claim
22 words
a control rod adapted to be manually shifted for movement in a direction generally parallel to the axis of said output shaft;
Claim 11
Dependent Claim
21 words
A parking brake according to claim 2, wherein said rotatable means is provided in the heel portion of said brake pawl.
Claim 12
Dependent Claim
21 words
A parking brake according to claim 2, wherein said rotatable means is provided between said stationary housing and said cam portion.
Claim 13
Dependent Claim
15 words
a cam portion carried by said control rod and having a cam surface formed thereon;
Claim 14
Dependent Claim
15 words
a cam portion carried by said control rod and having a cam surface formed thereon;
Claim 15
Dependent Claim
100 words
intermediate means including rotatable means disposed in at least one of the spaces formed in the heel portion of said brake pawl and between said cam portion of said control rod and said stationary housing, and reaction means having a cam surface formed thereon and disposed in the other of said spaces, both of said rotatable means and the cam surface of said reaction means being shaped and sized to keep abutting engagement with the cam surface of said cam portion thereby reducing operational frictions effected therebetween upon movement of said cam portion with respect to said intermediate means; and
Claim 16
Dependent Claim
100 words
intermediate means including rotatable means disposed in at least one of the spaces formed in the heel portion of said brake pawl and between said cam portion of said control rod and said stationary housing, and reaction means having a cam surface formed thereon and disposed in the other of said spaces, both of said rotatable means and the cam surface of said reaction means being shaped and sized to keep abutting engagement with the cam surface of said cam portion thereby reducing operational frictions effected therebetween upon movement of said cam portion with respect to said intermediate means; and
Claim 17
Dependent Claim
31 words
A parking brake according to claim 2, wherein said rotatable means are provided both between said brake pawl and said cam portion and between said stationary housing and said cam portion.
Claim 18
Dependent Claim
18 words
A parking brake according to claim 2, wherein said rotatable means has one or a plurality of balls.
Claim 19
Dependent Claim
71 words
spring means for biasing either of said cam portion, rotatable means and reaction means in such a direction that said brake pawl is kept out of meshing engagement with said parking gear, whereby upon manual shifting of said control rod said cam portion is yieldably moved against the biasing action of said spring means to its parking position in which said parking gear is in meshing engagement with said brake pawl.
Claim 20
Dependent Claim
71 words
spring means for biasing either of said cam portion, rotatable means and reaction means in such a direction that said brake pawl is kept out of meshing engagement with said parking gear, whereby upon manual shifting of said control rod said cam portion is yieldably moved against the biasing action of said spring means to its parking position in which said parking gear is in meshing engagement with said brake pawl.
Claim 21
Dependent Claim
17 words
A parking brake according to claim 2, wherein said rotatable means has a roller of cylindrical shape.
Claim 22
Dependent Claim
17 words
A parking brake according to claim 2, wherein said rotatable means has a roller of gourd-like shape.
Claim 23
Dependent Claim
17 words
A parking brake according to claim 2, wherein said rotatable means has a roller of spool-like shape.
Claim 24
Dependent Claim
26 words
A parking brake according to claim 7, further comprising guide means for guiding said rotatable means, wherein said spring means is provided in said guide means.
Claim 25
Dependent Claim
60 words
A parking brake according to claim 11, further comprising a ball seat mounted on one end of said spring means for retaining said rotatable means and a stop member formed on one end wall of said guide means and so sized as to allow limited movement of said rotatable means even when said ball seat is in abutting engagement therewith.
Claim 26
Dependent Claim
23 words
A parking brake according to claim 2, wherein said reaction means is provided for reciprocation between said brake pawl and said cam portion.
Claim 27
Dependent Claim
22 words
A parking brake according to claim 2, wherein said reaction means is provided for reciprocation between said housing and said cam portion.
Claim 28
Dependent Claim
34 words
A parking brake according to claim 2, wherein said reaction means and said rotatable means are provided, respectively, between said brake pawl and said cam portion and between said housing and said cam portion.
Claim 29
Dependent Claim
35 words
A parking brake according to claim 2, wherein said reaction means and said rotatable means are provided, respectively, between said stationary housing and said cam portion and in the heel portion of said brake pawl.
Claim 30
Dependent Claim
26 words
A parking brake according to claim 2, further comprising guide means for guiding said reaction means, wherein said spring means is provided in said guide means.
Claim 31
Dependent Claim
21 words
A parking brake according to claim 3, wherein said rotatable means is provided in the heel portion of said brake pawl.
Claim 32
Dependent Claim
21 words
A parking brake according to claim 3, wherein said rotatable means is provided between said stationary housing and said cam portion.
Claim 33
Dependent Claim
31 words
A parking brake according to claim 3, wherein said rotatable means are provided both in the heel portion of said brake pawl and said cam portion and between said stationary housing.
Claim 34
Dependent Claim
18 words
A parking brake according to claim 3, wherein said rotatable means has one or a plurality of balls.
Claim 35
Dependent Claim
17 words
A parking brake according to claim 3, wherein said rotatable means has a roller of cylindrical shape.
Claim 36
Dependent Claim
17 words
A parking brake according to claim 3, wherein said rotatable means has a rolLer of gourd-like shape.
Claim 37
Dependent Claim
17 words
A parking brake according to claim 3, wherein said rotatable means has a roller of spool-like shape.
Claim 38
Dependent Claim
30 words
A parking brake according to claim 21, further comprising guide means for guiding said rotatable means for limited movement therein, wherein said spring means is mounted on the cam portion.
Claim 39
Dependent Claim
49 words
A parking brake according to claim 25, further comprising first and second stop members carried by said control rod and so sized in diameter as to allow said cam portion to slidably reciprocate therebetween, wherein said spring means is interposed between said first stop member and said cam portion.
References Cited (Backward Citations)
US3187846A
Cited
US3213968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |