CA2144246A1 - Brake Valve with Prefill Chamber Unloading - Google Patents
Brake Valve with Prefill Chamber UnloadingInfo
- Publication number
- CA2144246A1 CA2144246A1 CA2144246A CA2144246A CA2144246A1 CA 2144246 A1 CA2144246 A1 CA 2144246A1 CA 2144246 A CA2144246 A CA 2144246A CA 2144246 A CA2144246 A CA 2144246A CA 2144246 A1 CA2144246 A1 CA 2144246A1
- Authority
- CA
- Canada
- Prior art keywords
- piston
- prefill
- high pressure
- stepped
- brake mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
- B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/16—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
Left and right two stage brake valves communicate fluid pressure to left and right brake mechanism. Each brake valve has an inlet for receiving pressurized brake fluid from a pump, a reservoir port, a stepped bore and a stepped piston member comprising a larger diameter prefill piston and a smaller diameter high pressure piston. The stepped piston is movable away from a rest position to transfer fluid to the brake mechanism. The stepped bore and the stepped piston form a high volume prefill chamber and a high pressure chamber.
The high pressure piston has a groove communicated with the brake mechanism, and the groove communicates with the inlet when the high pressure piston has moved a certain distance to transfer fluid from the high pressure chamber to the brake mechanism. The prefill piston has a sealing land and a second land on either side of a sealing ring which is slidable in the stepped bore. The sealing land sealingly engages the sealing ring when the prefill piston moves to transfer fluid from the prefill chamber to the brake mechanism. The sealing land is spaced apart from the sealing ring by a distance which is greater than the distance between the groove and the inlet when the stepped piston is in its rest position.
The high pressure piston has a groove communicated with the brake mechanism, and the groove communicates with the inlet when the high pressure piston has moved a certain distance to transfer fluid from the high pressure chamber to the brake mechanism. The prefill piston has a sealing land and a second land on either side of a sealing ring which is slidable in the stepped bore. The sealing land sealingly engages the sealing ring when the prefill piston moves to transfer fluid from the prefill chamber to the brake mechanism. The sealing land is spaced apart from the sealing ring by a distance which is greater than the distance between the groove and the inlet when the stepped piston is in its rest position.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002144246A CA2144246C (en) | 1995-03-09 | 1995-03-09 | Brake valve with prefill chamber unloading |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002144246A CA2144246C (en) | 1995-03-09 | 1995-03-09 | Brake valve with prefill chamber unloading |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2144246A1 true CA2144246A1 (en) | 1996-09-10 |
CA2144246C CA2144246C (en) | 1999-05-04 |
Family
ID=4155386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002144246A Expired - Fee Related CA2144246C (en) | 1995-03-09 | 1995-03-09 | Brake valve with prefill chamber unloading |
Country Status (1)
Country | Link |
---|---|
CA (1) | CA2144246C (en) |
-
1995
- 1995-03-09 CA CA002144246A patent/CA2144246C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2144246C (en) | 1999-05-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |