Patent US3831718A successfully refreshed from Google Patents.
US3831718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parking brake assembly for track-type vehicles
Assignee: Caterpillar Inc
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Filing: 1972-11-24
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Granted: 1974-08-27
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Expires: 1992-11-24
Abstract
Abstract The final drive for a track-type vehicle comprises a speed reduction gear train operatively connectible to a hydrostatic drive motor to drive a track engaging sprocket. A parking brake assembly is mounted between the motor and gear train and comprises a piston adapted to disengage the brake by directly engaging a snap ring mounted in an annular groove formed on a reciprocal hub. The hub has a pressure plate secured thereon which, in turn, releases spring-biased friction discs upon disengagement of the brake. A radially disposed end plate is attached to the piston to abut an end of the hub to prevent dislodgement of the snap ring.
Inventors
- 👤 T Muller
- 👤 E Sitton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:38
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D65/186; B; B60; B60T; B60T1/00; B60T1/02; B60T1/06; B60T1/062; F16D55/00; F16D55/24; F16D55/26; F16D55/36; F16D55/40; F16D2055/0004; F16D2055/0058; F16D2121/00; F16D2121/02; F16D2121/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
A drive establishing device comprising: friction disc means mounted in said device and operatively connectable to a power shaft; a hub reciprocally mounted in said device and having a pressure plate secured thereto for selectively compressing said friction disc means; a piston reciprocally mounted on said hub; positioning means for maintaining said piston and said hub in a fixed axial position when said hub is moved axially in a first axial direction; and drive transmitting means comprising a snap ring, contactable by both said hub and said piston, and detachably mounted on said hub to be engaged by said piston to move said hub in a second axial direction.
Claim 2
Dependent Claim
109 words
A drive establishing device comprising: friction disc means mounted in said device and operatively connectable to a power shaft; a hub reciprocally mounted in said device and having a pressure plate secured thereto for selectively compressing said friction disc means; a piston reciprocally mounted on said hub; positioning means for maintaining said piston and said hub in a fixed axial position when said hub is moved axially in a first axial direction; and drive transmitting means comprising a snap ring, contactable by both said hub and said piston, and detachably mounted on said hub to be engaged by said piston to move said hub in a second axial direction.
Claim 3
Dependent Claim
20 words
The device of claim 1 wherein said drive transmitting means is positioned axially between said piston and said positioning means.
Claim 4
Dependent Claim
24 words
The device of claim 1 further comprising spring means engaging said pressure plate to normally compress said pressure plate against said friction disc means.
Claim 5
Dependent Claim
37 words
The device of claim 3 further comprising a housing, said friction disc means mounted between said pressure plate and an internal wall of said housing to be compressed thereagainst under the biasing force of said spring means.
Claim 6
Dependent Claim
35 words
The device of claim 3 wherein said housing further comprises an annular member detachably mounted to said internal wall and having said friction disc means mounted for axial movements thereon and on said power shaft.
Claim 7
Dependent Claim
37 words
The device of claim 5 wherein said housing further comprises another annular member detachably mounted in axial alignment to said first-mentioned annular member and to said internal wall and having said piston and hub reciprocally mounted therein.
Claim 8
Dependent Claim
38 words
The device of claim 1 wherein said positioning means comprises an end plate detachably mounted on said piston to engage an end of said hub, opposite to an end of said hub having said pressure plate secured thereto.
Claim 9
Dependent Claim
26 words
The device of claim 1 further comprising a second power shaft detachably connected in axial alignment to said first-mentioned power shaft by an intermediate coupling shaft.
Claim 10
Dependent Claim
29 words
The device of claim 8 wherein said first-mentioned power shaft constitutes an output shaft to a transmission and said second power shaft constitutes an input shaft from a motor.
Claim 11
Dependent Claim
23 words
The device of claim 9 wherein said transmission is operatively connected to a drive sprocket of a final drive for a track-type vehicle.
Claim 12
Dependent Claim
200 words
A final drive in combination with a track-type vehicle, said final drive comprising a track driving sprocket, a transmission having an input shaft drivingly connected to said sprocket, a motor means having an output shaft for selectively driving said transmission, and a normally engaged parking brake assembly, detachably connected between said motor means and said transmission, comprising friction disc means operatively connectible to said output shaft for preventing said output shaft from driving said input shaft, a hub mounted for axial movements in said brake assembly and having a pressure plate sEcured thereto which normally engages said friction disc means, spring means engaging said pressure plate to normally move said hub and pressure plate in a first axial direction to compress said friction disc means, a piston reciprocally mounted on said hub, positioning means releasably attached to said piston and engaging said hub to maintain said piston and said hub in a fixed axial position when said hub is moved in said first axial direction, and drive transmitting means detachably mounted on said hub to be engaged by said piston to move said hub in a second axial direction to compress said spring means to disengage said parking brake assembly.
Claim 13
Dependent Claim
200 words
A final drive in combination with a track-type vehicle, said final drive comprising a track driving sprocket, a transmission having an input shaft drivingly connected to said sprocket, a motor means having an output shaft for selectively driving said transmission, and a normally engaged parking brake assembly, detachably connected between said motor means and said transmission, comprising friction disc means operatively connectible to said output shaft for preventing said output shaft from driving said input shaft, a hub mounted for axial movements in said brake assembly and having a pressure plate sEcured thereto which normally engages said friction disc means, spring means engaging said pressure plate to normally move said hub and pressure plate in a first axial direction to compress said friction disc means, a piston reciprocally mounted on said hub, positioning means releasably attached to said piston and engaging said hub to maintain said piston and said hub in a fixed axial position when said hub is moved in said first axial direction, and drive transmitting means detachably mounted on said hub to be engaged by said piston to move said hub in a second axial direction to compress said spring means to disengage said parking brake assembly.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |