Patent US3703941A successfully refreshed from Google Patents.
US3703941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parking brake
Assignee: Nissan Motor Co Ltd
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Filing: 1971-01-15
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Granted: 1972-11-28
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Expires: 1991-01-15
Abstract
Abstract A parking brake for use with an automatic power transmission mechanism having a parking gear which is engaged or disengaged by a brake pawl with or from a brake pawl upon shifting movement of a rotary shaft through a mechanical linkage. A cam member is rotatably mounted around the rotary shaft and is operatively connected thereto by a torsion spring. Rotation of the rotary shaft in one direction causes rotation of the cam member in the same direction to move the brake pawl into engagement with the parking gear thereby locking it against rotation in either direction. If the tooth of the brake pawl is misaligned with respect to a space between two adjacent teeth of the parking gear, the torsion spring yields and exerts a pressure on the brake pawl that tends to urge it toward the braking or locking position. When the parking gear moves slightly, the spring force will snap the brake pawl into braking position.
Inventors
- 👤 Koichi Ohie
- 👤 Koji Enomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:41
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/34; F16H63/3416; B; B60; B60T; B60T1/00; B60T1/005; F16H63/40; F16H63/48
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
266 words
A parking brake for locking a parking gear carried by an output shaft of an automatic power transmission mechanism, said output shaft being rotatably journaled in a relatively stationary housing, comprising: a brake prawl mounted on at one end thereof said housing for angular oscillation into and out of engagement with said parking gear at the other end thereof, a first spring means for normally biasing said brake pawl out of engagement with said parking gear; a rotary shaft rotatably journaled in said housing and connected to a manually operable member through a mechanical linkage for changing its angular position; a cam member rotatably mounted around said rotary shaft and having a cam surface configured to engage with the other end of said brake pawl; and a second spring means mounted around said rotary shaft and having one end connected to said rotary shaft and the other end connected to said cam member for biasing against the action of said first spring means the other end of said brake pawl through said cam surface into engagement with said parking gear in accordance with the angular position of said rotary shaft, whereby said parking gear is locked by said brake pawl against rotation in either direction after said parking gear has been sligHtly rotated under the bias condition of said second spring means, the angular oscillation of said brake pawl being carried out about an axis generally parallel to the axis of said output shaft, and the rotation of said rotary shaft being carried out about said axis generally perpendicular to said axis of said output shaft.
Claim 2
Dependent Claim
266 words
A parking brake for locking a parking gear carried by an output shaft of an automatic power transmission mechanism, said output shaft being rotatably journaled in a relatively stationary housing, comprising: a brake prawl mounted on at one end thereof said housing for angular oscillation into and out of engagement with said parking gear at the other end thereof, a first spring means for normally biasing said brake pawl out of engagement with said parking gear; a rotary shaft rotatably journaled in said housing and connected to a manually operable member through a mechanical linkage for changing its angular position; a cam member rotatably mounted around said rotary shaft and having a cam surface configured to engage with the other end of said brake pawl; and a second spring means mounted around said rotary shaft and having one end connected to said rotary shaft and the other end connected to said cam member for biasing against the action of said first spring means the other end of said brake pawl through said cam surface into engagement with said parking gear in accordance with the angular position of said rotary shaft, whereby said parking gear is locked by said brake pawl against rotation in either direction after said parking gear has been sligHtly rotated under the bias condition of said second spring means, the angular oscillation of said brake pawl being carried out about an axis generally parallel to the axis of said output shaft, and the rotation of said rotary shaft being carried out about said axis generally perpendicular to said axis of said output shaft.
Claim 3
Dependent Claim
51 words
A parking brake according to claim 1, further comprising an anchor pin carried by said rotary shaft and connected to said one end of said second spring means for limiting the relative angular movement of said cam member when said anchor pin is engaged with a portion of said cam member.
Claim 4
Dependent Claim
269 words
A parking brake for locking a parking gear carried by an output shaft of an automatic power transmission mechanism, said output shaft being rotatably journaled in a relatively stationary housing, comprising: a brake pawl mounted on at one end thereof said housing for angular oscillation into and out of engagement with said parking gear at the other end thereof; a first spring means for normally biasing said brake pawl out of engagement with said parking gear, a rotary shaft rotatably journaled in said housing and connected to a manually operable member through a mechanical linkage for changing its angular position; a cam member rotatably mounted around said rotary shaft and having a cam surface configured to engage with the other end of said brake pawl; and a second spring means mounted around said rotary shaft and having one end connected to said rotary shaft and the other end connected to said cam member for biasing against the action of said first spring means the other end of said brake pawl through said cam surface into engagement with said parking gear in accordance with the angular position of said rotary shaft, whereby said parking gear is locked by said brake pawl against rotation in either direction after said parking gear has been slightly rotated under the bias condition of said second spring means, the angular oscillation of said brake pawl being carried out about an axis generally perpendicular to the axis of said output shaft, and the rotation of said rotary shaft being carried out about an axis generally parallel to the axis about which said brake pawl is oscillatable.
Claim 5
Dependent Claim
269 words
A parking brake for locking a parking gear carried by an output shaft of an automatic power transmission mechanism, said output shaft being rotatably journaled in a relatively stationary housing, comprising: a brake pawl mounted on at one end thereof said housing for angular oscillation into and out of engagement with said parking gear at the other end thereof; a first spring means for normally biasing said brake pawl out of engagement with said parking gear, a rotary shaft rotatably journaled in said housing and connected to a manually operable member through a mechanical linkage for changing its angular position; a cam member rotatably mounted around said rotary shaft and having a cam surface configured to engage with the other end of said brake pawl; and a second spring means mounted around said rotary shaft and having one end connected to said rotary shaft and the other end connected to said cam member for biasing against the action of said first spring means the other end of said brake pawl through said cam surface into engagement with said parking gear in accordance with the angular position of said rotary shaft, whereby said parking gear is locked by said brake pawl against rotation in either direction after said parking gear has been slightly rotated under the bias condition of said second spring means, the angular oscillation of said brake pawl being carried out about an axis generally perpendicular to the axis of said output shaft, and the rotation of said rotary shaft being carried out about an axis generally parallel to the axis about which said brake pawl is oscillatable.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |