US5709083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic swing motor deceleration control
Assignee: Caterpillar Inc
•
Filing: 1996-08-15
•
Granted: 1998-01-20
•
Expires: 2016-08-15
Abstract
Abstract A hydraulic deceleration control for a hydraulic motor includes a pilot operated control valve for controlling fluid flow through a pair of motor lines connected to the opposite sides of the hydraulic motor. A valve device is disposed to communicate a source of pressurized fluid to a fluid energy storage device when the control valve is in its open position and to release the pressurized fluid contained in the storage device when the control valve is moved from the open position to its closed position. A throttle orifice releases the fluid from the storage device at a controlled flow rate. A pilot operated diverter valve is disposed in series with an orifice disposed between the motor lines to control fluid flow through the orifice and has a spring disposed at a first end resiliently biasing the diverter valve to its closed position. The storage device is in communication with a second end of the diverter valve when the valve device is releasing the fluid from the storage device so that the diverter valve moves to and is maintained in its open position while fluid is being released from the storage device.
Inventors
- 👤 Dennis L. Sorbel
- 👤 John W. Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:51
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/08; E02F9/10; E02F9/12; E02F9/121; E02F9/123; B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/22; E02F9/128
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
A hydraulic deceleration control for a hydraulic motor having a pair of motor lines connected to the opposite sides of the hydraulic motor and a pilot operated control valve connected to the motor lines and having closed and open positions comprising: a source of pressurized fluid; a fluid energy storage device including a fluid chamber; a valve device disposed to communicate the source of pressurized fluid to the (storage device) fluid chamber when the control valve is in its open position and to release the pressurized fluid contained in the (storage device) fluid chamber when the control valve is moved from the open position to the closed position, the valve device including a throttle orifice to release the fluid from the (storage device) fluid chamber at a controlled rate; an orifice disposed between the motor lines; and a pilot operated diverter valve disposed in series with the orifice to control fluid flow through the orifice and having first and second ends and a spring disposed at the first end resiliently biasing the diverter valve to its closed position, the (storage device) fluid chamber being in communication with the second end of the diverter valve when the valve device is releasing the fluid from the (storage device) fluid chamber.
Claim 2
Dependent Claim
208 words
A hydraulic deceleration control for a hydraulic motor having a pair of motor lines connected to the opposite sides of the hydraulic motor and a pilot operated control valve connected to the motor lines and having closed and open positions comprising: a source of pressurized fluid; a fluid energy storage device including a fluid chamber; a valve device disposed to communicate the source of pressurized fluid to the (storage device) fluid chamber when the control valve is in its open position and to release the pressurized fluid contained in the (storage device) fluid chamber when the control valve is moved from the open position to the closed position, the valve device including a throttle orifice to release the fluid from the (storage device) fluid chamber at a controlled rate; an orifice disposed between the motor lines; and a pilot operated diverter valve disposed in series with the orifice to control fluid flow through the orifice and having first and second ends and a spring disposed at the first end resiliently biasing the diverter valve to its closed position, the (storage device) fluid chamber being in communication with the second end of the diverter valve when the valve device is releasing the fluid from the (storage device) fluid chamber.
Claim 3
Dependent Claim
37 words
The deceleration control of claim 1 wherein the valve device includes a spool and a passage between the spool and the throttle orifice with the passage being selectively connected to the second end of the diverter valve.
Claim 4
Dependent Claim
33 words
The deceleration control of claim 2 including a spring applied hydraulically released brake disposed to frictionally stop rotation of the hydraulic motor wherein the energy storage device includes an actuator of the brake.
Claim 5
Dependent Claim
41 words
The deceleration control of claim 3 including a pilot valve having an open position and disposed to communicate pilot fluid to an end of the control valve and an end of the spool of the valve device at its open position.
Claim 6
Dependent Claim
22 words
The deceleration control of claim 3 including an on-off valve disposed between the passage and the second end of the diverter valve.
Claim 7
Dependent Claim
71 words
The deceleration control of claim 1 including a spring applied hydraulically released brake disposed to frictionally stop rotation of the hydraulic motor and including an actuator having the fluid chamber and a spring chamber, the valve device being connected to the fluid chamber and has a brake off position communicating the source of pressurized fluid to the fluid chamber and a brake-on position releasing pressurized fluid contained in the fluid chamber.
Claim 8
Dependent Claim
42 words
The deceleration control of claim 6 including a pilot valve having an open position and disposed to communicate pilot fluid to an end of the control valve, the valve device and the first end of the diverter valve at its open position.
References Cited (Backward Citations)
US4194365A
Cited
US4317331A
Cited
JPS55139505A
Cited
US4244276A
Cited
US4495767A
Cited
US4481770A
Cited
US4615174A
Cited
US4586332A
Cited
US4729222A
Cited
US5419132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-19 | 2001-07-21 | 2002-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-19 | 2005-07-21 | 2006-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-19 | 2009-07-21 | 2010-01-20 | $7700.00 | Window Closed / Lapsed |