CA2144246A1 - Brake Valve with Prefill Chamber Unloading - Google Patents

Brake Valve with Prefill Chamber Unloading

Info

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
Application number
CA2144246A
Other languages
French (fr)
Other versions
CA2144246C (en
Inventor
Douglas M. Durant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Priority to CA002144246A priority Critical patent/CA2144246C/en
Publication of CA2144246A1 publication Critical patent/CA2144246A1/en
Application granted granted Critical
Publication of CA2144246C publication Critical patent/CA2144246C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
CA002144246A 1995-03-09 1995-03-09 Brake valve with prefill chamber unloading Expired - Fee Related CA2144246C (en)

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)

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