GB2304839A - Coupling cap for vacuum bleeding equipment for a vehicle hydraulic brake system - Google Patents

Coupling cap for vacuum bleeding equipment for a vehicle hydraulic brake system Download PDF

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Publication number
GB2304839A
GB2304839A GB9518118A GB9518118A GB2304839A GB 2304839 A GB2304839 A GB 2304839A GB 9518118 A GB9518118 A GB 9518118A GB 9518118 A GB9518118 A GB 9518118A GB 2304839 A GB2304839 A GB 2304839A
Authority
GB
United Kingdom
Prior art keywords
screw
cap
coupling cap
head
sealing ring
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
GB9518118A
Other versions
GB9518118D0 (en
GB2304839B (en
Inventor
Michael Neil Basnett
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.)
MG Rover Group Ltd
Original Assignee
MG Rover Group Ltd
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 MG Rover Group Ltd filed Critical MG Rover Group Ltd
Priority to GB9518118A priority Critical patent/GB2304839B/en
Publication of GB9518118D0 publication Critical patent/GB9518118D0/en
Publication of GB2304839A publication Critical patent/GB2304839A/en
Application granted granted Critical
Publication of GB2304839B publication Critical patent/GB2304839B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
    • 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
    • B60T11/28—Valves specially adapted therefor
    • B60T11/30—Bleed valves for hydraulic brake systems
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • B60T17/222—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems by filling or bleeding of hydraulic systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)

Abstract

A coupling cap 28 to be applied to a head 22 of a bleed screw 10 located in a drainage body 14 of a vehicle's hydraulic brake system, comprises a securing portion 32 whereby it can be snap-fitted over the screw head with a first sealing ring 34 of the cap engaging in a neck 24 of the screw and a second sealing ring 38 of the cap abutting a spot face 20 of the drainage body 14 surrounding the screw. In use, the first sealing ring 34 seals against the head 22 to enable suction to be applied to a conduit 16 and the second sealing ring 38 ensures that ambient air cannot be drawn in between the screw threading of the screw and the drainage body to dilute the suction applied.

Description

COUPLING CAP FOR VACUUM BLEEDING EOUIPMENT In a hydraulic brake system for a vehicle provision has to be made for the system to be drained of hydraulic fluid (commonly referred to as being "bled") during servicing of the vehicle. Such provision usually includes at least one bleed screw which operates as an outlet valve, the bleed screw being a screw-threaded fitting which is rotatable between open and closed conditions.
Whilst such a brake system can usually be bled by gravity alone, it can be preferable to use a vacuum bleeding technique in which the' fluid (and any entrained air) is drawn through the system by suction. Known equipment for this purpose comprises a coupling cap which leads to an air venturi, the cap being a snap fit over a head portion of a bleed screw and being arranged to seal against a neck of the screw adjacent to the head portion to enable suction to be applied to the system.
A weakness of such known vacuum bleeding equipment is that ambient air can sometimes become drawn in through the screw threads of the bleed screw, so lessening the reduction in pressure which the equipment can achieve.
It is an object of the present invention to provide an improved fitment enabling vacuum bleeding equipment to be applied to a bleed screw in a more effective and efficient manner.
The invention provides, in one of its aspects, a coupling cap for enabling vacuum bleeding equipment to be applied to a bleed screw of a vehicle brake system, the cap being arranged to fit over the screw and comprising sealing means arranged to seal about the screw against a drainage body in which the screw is engaged and from which it projects, the cap so enveloping the screw to enable suction to be applied through a passage through the screw to a drainage conduit within the body and to preclude the ingress of ambient air by way of the screw-threaded interengagement between the bleed screw and the body.
In a preferred construction, the cap comprises means forming a constriction within a securing portion of the cap, the constriction being arranged to seat around a neck beneath a head portion of the bleed screw, whereby the cap is arranged to be snap-fitted over the head for retention on the screw. A seal may be formed between the constriction of the cap and the screw.
The sealing means preferably comprises a sealing ring formed by an end portion of a skirt-forming portion of the cap arranged to perform as a suction cap. In a construction as referred to in the last preceding paragraph, the skirt-forming portion may extend from the constriction of the securing portion.
There now follows a description, to be read with reference to the accompanying drawing, of a coupling cap which illustrates the invention by way of example.
The accompanying drawing is an axial sectional illustration of a coupling cap applied to a bleed screw.
As part of a hydraulic brake system in a vehicle, a bleed screw 10, of a conventional kind, is screw-threadedly mounted in a tapped bore 12 in a drainage body 14. A conduit 16 leads through the body to the bleed screw for the drainage of hydraulic fluid from the system. The screw acts as a stop valve, being rotatable in the body between a closed condition, in which it is fully tightened down in the bore 12 and flow from the conduit 16 is prevented, and an open condition in which flow can occur from the conduit along a passage 18 through the screw.
At its outer end, remote from a spot face 20 surrounding the entry to the bore 12, the bleed screw comprises an end portion forming a head 22. A portion of reduced diameter adjacent to the head provides a neck 24 between the head and a hexagonal portion forming a grip 26.
An externally threaded stem 28 of the screw extends from the grip, an inner end portion of the stem being mounted in the tapped bore 12 in the drainage body. To open the valve, the screw can be held by the grip 26 to enable it to be rotated in order to draw it slightly from the bore 12.
Vacuum bleeding equipment comprises a coupling cap 28 from which a duct 30 leads to an air venturi or other suction device. The cap, which is moulded of a flexible and resilient material, comprises a securing portion 32 which enables it to be snap-fitted over the head 22 of the bleed screw for light retention; the securing portion provides an internal retaining and sealing ring 34 which forms a constriction within the cap and seats around the neck 24 beneath the head 22 of the screw. A skirt-forming portion 36 of the cap extends from the retaining ring 34 to abut the spot face 20 about the screw.
The skirt-forming portion 36 terminates in an inner end portion forming a sealing ring 38 which presents a broad flat annular sealing face 40 to seat against the opposing spot face 20.
In use of the vacuum bleeding equipment, suction is applied to reduce the pressure within the coupling cap 28.
A seal is formed between the retaining and sealing ring 34 of the cap and an undersurface of the screw head 22 adjacent to the neck 24, whereby suction is applied through the bleed screw to the system drainage conduit 16: Should there be any tendency for air leakage to occur through the screw-threaded interconnection of the bleed screw and the drainage block 14, the face 40 of the sealing ring 38 of the skirt 36 will seal against the spot face 20 to prevent further ingress of air past the screw into the conduit.
This ensures that there is no dilution of the suction applied to the conduit.
The cap 28 is sufficiently flexible to permit the grip 26 of the bleed screw to be held through the material of the cap, whereby the screw can be operated while the cap is in place over it.

Claims (5)

1. A coupling cap for enabling vacuum bleeding equipment to be applied to a bleed screw of a vehicle brake system, the cap being arranged to fit over the screw and comprising sealing means arranged to seal about the screw against a drainage body in which the screw is engaged and from which it projects, the cap so enveloping the screw to enable suction to be applied through the passage to a drainage conduit within the body and to preclude the ingress of ambient air by way of the screw-threaded interengagement between the bleed screw and the body.
2. A coupling cap according to claim 1 in which the sealing means comprises a sealing ring formed by an end portion of a skirt-forming portion of the cap.
3. A coupling cap according to either of claims 1 and 2 comprising means forming a constriction within a securing portion of the cap, the constriction being arranged to seat around a neck beneath a head portion of the bleed screw whereby the cap is arranged to be snap-fitted over the head for retention on the screw.
4. A coupling cap substantially as hereinbefore described with reference to the accompanying drawing.
5. Vacuum bleeding equipment comprising a coupling cap according to any one of claims 1 to 4.
GB9518118A 1995-09-06 1995-09-06 Coupling cap for vacuum bleeding equipment Expired - Lifetime GB2304839B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9518118A GB2304839B (en) 1995-09-06 1995-09-06 Coupling cap for vacuum bleeding equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9518118A GB2304839B (en) 1995-09-06 1995-09-06 Coupling cap for vacuum bleeding equipment

Publications (3)

Publication Number Publication Date
GB9518118D0 GB9518118D0 (en) 1995-11-08
GB2304839A true GB2304839A (en) 1997-03-26
GB2304839B GB2304839B (en) 1999-02-03

Family

ID=10780236

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9518118A Expired - Lifetime GB2304839B (en) 1995-09-06 1995-09-06 Coupling cap for vacuum bleeding equipment

Country Status (1)

Country Link
GB (1) GB2304839B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314625A1 (en) * 2001-11-21 2003-05-28 Tenneco Automotive Inc. Brake bleed tool
EP3301335A1 (en) * 2016-09-30 2018-04-04 Safran Aero Boosters SA Fluid valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236549A (en) * 1978-05-12 1980-12-02 Autoline Supply Company Bleeder kit for bleeding a master cylinder
GB2058981A (en) * 1979-04-11 1981-04-15 Hermetite Products Ltd Bleeding device for hydraulic systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236549A (en) * 1978-05-12 1980-12-02 Autoline Supply Company Bleeder kit for bleeding a master cylinder
GB2058981A (en) * 1979-04-11 1981-04-15 Hermetite Products Ltd Bleeding device for hydraulic systems

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314625A1 (en) * 2001-11-21 2003-05-28 Tenneco Automotive Inc. Brake bleed tool
EP3301335A1 (en) * 2016-09-30 2018-04-04 Safran Aero Boosters SA Fluid valve
BE1024622B1 (en) * 2016-09-30 2018-05-24 Safran Aero Boosters S.A. FLUID VALVE
US10760707B2 (en) 2016-09-30 2020-09-01 Safran Aero Boosters S.A. Fluid valve

Also Published As

Publication number Publication date
GB9518118D0 (en) 1995-11-08
GB2304839B (en) 1999-02-03

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 19990211