US3595352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch and brake with pressure operated sequencing valve
Assignee: Massey Ferguson Services NV
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Filing: 1969-05-12
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Granted: 1971-07-27
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Expires: 1989-05-12
Abstract
Abstract Each track of a crawler vehicle is provided with a hydraulically operated drive clutch and brake. A control valve and a pilot operated sequencing relief valve are provided to operate each clutch and brake set. These valves operate to fully disengage the clutches before the brakes are applied and to fully release the brakes before the clutches are reengaged to minimize wear on the clutches and brakes. The relief valve is movable between clutch and brake operating positions and is responsive to completion of these operations to control the supply of hydraulic fluid to the control valve.
Inventors
- 👤 Eugenio Todeschini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:13
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T13/00; B60T13/10; B60T13/12; B60T13/16; B60T13/18; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/08; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/265; Y10T137/2663; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7925; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
428 words
A hydraulic control mechanism for sequentially operating hydraulic clutch and brake operators to sequentially operate a clutch and a brake, including valve body means having first and second bores; a manually operated first plunger slidable in the first bore and having a first position for effecting pressurization of the clutch operator, a second position for effecting pressurization of the brake operator and a third position effecting depressurization of both said operators; a hydraulically operated second plunger slidable in the second bore to divide the second body into first and second chamber; first passage means connecting the first bore with the clutch operator and the second chamber; second passage means connecting the first Bore with the brake operator; third passage means connecting the first bore with the first chamber; a source of pressure fluid including a sump; fourth passage means connecting the source with the first bore with the first chamber; fifth passage means connecting the first bore with sump; gallery means on the first plunger for connecting the first and fourth passage means in the first and second positions of the first plunger to pressurize the clutch operator, for connecting the second and third passage means to enable pressurization of the brake operator in first and second positions of the first plunger, and for disconnecting said passage means to effect depressurization of both said operators in said third position thereof; valving means associated with the first plunger for connecting the second and fifth passage means to effect depressurization of the brake operator in the first and third positions of the first plunger and for disconnecting said passage means to enable pressurization of the brake operator in the second position thereof; biasing means biasing the second plunger to a first position disconnecting the third and fourth passage means to prevent enable pressurization of the brake operator, the second plunger being responsive to pressure fluid in the first chamber to move to a second position connecting the third and fourth passage means to enable pressurization of the brake operator and being responsive to pressure fluid in the second chamber to move between the first and second positions to throttle fluid flow into the third passage means; and relief valve means in the second chamber responsive to a predetermined pressure sufficient to operate said clutch to relieve pressure in the second chamber and enable pressure in the first chamber to shift the second plunger to the second position to deliver pressure fluid to the second passage means for selective operation of said brake in response to positioning of the first plunger.
Claim 2
Dependent Claim
428 words
A hydraulic control mechanism for sequentially operating hydraulic clutch and brake operators to sequentially operate a clutch and a brake, including valve body means having first and second bores; a manually operated first plunger slidable in the first bore and having a first position for effecting pressurization of the clutch operator, a second position for effecting pressurization of the brake operator and a third position effecting depressurization of both said operators; a hydraulically operated second plunger slidable in the second bore to divide the second body into first and second chamber; first passage means connecting the first bore with the clutch operator and the second chamber; second passage means connecting the first Bore with the brake operator; third passage means connecting the first bore with the first chamber; a source of pressure fluid including a sump; fourth passage means connecting the source with the first bore with the first chamber; fifth passage means connecting the first bore with sump; gallery means on the first plunger for connecting the first and fourth passage means in the first and second positions of the first plunger to pressurize the clutch operator, for connecting the second and third passage means to enable pressurization of the brake operator in first and second positions of the first plunger, and for disconnecting said passage means to effect depressurization of both said operators in said third position thereof; valving means associated with the first plunger for connecting the second and fifth passage means to effect depressurization of the brake operator in the first and third positions of the first plunger and for disconnecting said passage means to enable pressurization of the brake operator in the second position thereof; biasing means biasing the second plunger to a first position disconnecting the third and fourth passage means to prevent enable pressurization of the brake operator, the second plunger being responsive to pressure fluid in the first chamber to move to a second position connecting the third and fourth passage means to enable pressurization of the brake operator and being responsive to pressure fluid in the second chamber to move between the first and second positions to throttle fluid flow into the third passage means; and relief valve means in the second chamber responsive to a predetermined pressure sufficient to operate said clutch to relieve pressure in the second chamber and enable pressure in the first chamber to shift the second plunger to the second position to deliver pressure fluid to the second passage means for selective operation of said brake in response to positioning of the first plunger.
Claim 3
Dependent Claim
47 words
The hydraulic control mechanism of claim 1, including sixth passage means connecting the first chamber to sump, the second plunger being responsive to pressure fluid in the first chamber to move to a third position opening the sixth passage when the first plunger is in third position.
Claim 4
Dependent Claim
33 words
The hydraulic control mechanism of claim 1, including biasing means operable upon movement of the first plunger to first position and beyond to third position to oppose such movement of the first plunger.
Claim 5
Dependent Claim
47 words
The hydraulic control mechanism of claim 1, including seventh passage means connecting the first bore to sump, said gallery means connecting the first and seventh passage means in the third position of the first plunger and disconnecting said passage means in the first and second positions thereof.
Claim 6
Dependent Claim
48 words
The hydraulic control mechanism of claim 1, wherein the second plunger has a first pressure area exposed to the first chamber and a second larger pressure area exposed to the second chamber, so that equal pressure in both chambers effect movement of the second plunger toward first position.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |