GB2082277A - Master Cylinder - Google Patents

Master Cylinder Download PDF

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Publication number
GB2082277A
GB2082277A GB8122477A GB8122477A GB2082277A GB 2082277 A GB2082277 A GB 2082277A GB 8122477 A GB8122477 A GB 8122477A GB 8122477 A GB8122477 A GB 8122477A GB 2082277 A GB2082277 A GB 2082277A
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GB
Grant status
Application
Patent type
Prior art keywords
body
master cylinder
sleeve
passageway
member
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
GB8122477A
Other versions
GB2082277B (en )
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.)
Lucas Industries PLC
Original Assignee
Lucas Industries PLC
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

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T11/00Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10Transmitting 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
    • B60T11/16Master control, e.g. master cylinders
    • B60T11/22Master control, e.g. master cylinders characterised by being integral with reservoir
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/24Transmitting 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 gaseous
    • B60T13/46Vacuum systems
    • B60T13/52Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/565Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed

Abstract

A master cylinder for a vehicle braking system comprises a body (2) with a bore (3) open at the rear end of the body, a reservoir (4), a transverse port (17) in the body opening into the bore (3) and positioned rearwardly of the reservoir, and a passageway defined between the exterior of the body (2) and a sleeve (22) mounted thereon to communicate the transverse port (17) with a chamber (7) of the reservoir. The sleeve may be integral with the housing of a booster assembled with the master cylinder (Figure 2) and an element (64) may be interposed between the sleeve and the master cylinder body and be provided with a tubular extension (66) interconnecting the reservoir with the passageway (Figure 3). <IMAGE>

Description

SPECIFICATION Master Cylinder This invention relates to master cylinders for vehicle braking systems, and in particular to a master cylinder which comprises a body with an axial bore open at the rear end of the body, a reservoir chamber, a transverse port in the body opening into the bore and positioned rearwardly of the reservoir chamber, and a passage communicating said reservoir chamber with said transverse port.

A master cylinder of the above form is proposed in our copending British Patent Application No. 8018215 (Publication No.

2052656) and the advantage of this construction is that it allows the reservoir to be located at the forward end of the body, whereby the rear end of the master cylinder can be received within an actuating servo-booster and an overall space saving achieved.

In the master cylinders disclosed in the aforementioned Application the transverse port which is normally open to a pressure chamber defined in the bore of the master cylinder body, communicates with the reservoir chamber through a longitudinal passageway extending through the wall of the body parallel to the bore axis, the passageway extending forwardly from an internal shoulder formed in the bore to the reservoir chamber and intersecting the transverse port.

It has now been found that the longitudinal passageway is more difficult to machine through the body wall than has been anticipated. The main problems encountered are difficulty in maintaining the straightness of the passageway over the necessary length; difficulty in ensuring correct fluid connection between reservoir chamber and transverse port; and weakening of the wall of the master cylinder body. Although the last mentioned problem could be avoided by making the body wall thicker it would be contrary to the main objectives of minimising space and weight.

The present invention aims at avoiding the problems of the previously proposed construction and accordingly provides a master cylinder of the form initially described above wherein the passageway communicating the transverse port with the reservoir chamber is defined over at least part of its length between the outside of the body and a member mounted on the body.

This construction with the passageway formed between the body and the member allows all the problems associated with drilling a longitudinal passageway in the body wall to be positively eliminated.

An especially simple arrangement is obtained when the said member mounted on the body takes the form of a sleeve. Assembly of the master cylinder is facilitated if the sleeve is made a sliding fit on the body, in which case to avoid any need to machine a groove or the like in the outside surface of the body, the sleeve is preferably provided with at least one longitudinal groove on its internal surface to define the passageway. Grooves are comparatively simple to produce on the inside of the sleeve, either during moulding in the case of a plastics sleeve, or by crimping to form flutes in the case of a pressed metal sleeve.It is of advantage if the sleeve projects beyond the rear end of the body and is sealed to the actuating rod protruding through the open end of the master cylinder bore, since the passageway may then also serve to communicate, via the end of the body, the reservoir chamber with a recuperation chamber defined in the bore behind the piston.

If the master cylinder is to be assembled with a booster the member mounted on the body can be made integral with the booster housing, whereby the need for a separate member is eliminated and a simpler construction obtained. In an especially advantageous embodiment the member is a sleeve integral with a front part of the booster housing and at least a part of the reservoir housing is also integral with the front part of the booster housing and includes a port communicating the reservoir chamber with the interior of the sleeve. With these parts made in a single moulding manufacture and assembly are further simplified.

It is possible for an element to be interposed between the body and the member mounted thereon and to define partially the passageway, which may be of benefit in simplifying the member itself. For example, the element may be a tubular liner which is a sliding fit on the body and the member a metal sleeve which is a sliding fit on the liner. The element can be provided with an integral tubular portion which defines a duct communicating the reservoir chamber with that part of the passageway defined between the member and the body, which facilitates the use of a reservoir housing made separately from the master cylinder body. The member mounted on the body over the element can comprise a sleeve or part of a booster housing as described above.

To assist a better understanding of the invention some embodiments will now be described in greater detail with reference being made to the accompanying drawings in which: Figure 1 shows in axial cross-section a tandem master cylinder in accordance with the invention; Figure 2 shows in axial cross-section another tandem master cylinder according to the invention and in combination with a servobooster; and Figure 3 shows a third tandem master cylinder embodying the invention, also in axial crosssection.

In the drawings the same reference numerals have been used to indicate corresponding parts in the different embodiments.

The tandem master cylinder illustrated in Figure 1 is intended for a dual circuit braking system and comprises an integrally cast or moulded housing 1 including a body 2 with an axial blind bore 3 open at the rear end of the body, a reservoir 4 divided internally by a baffle 5 into two chambers 6,7 and a flange 8 for mounting the master cylinder to a booster or other vehicle component. A piston 9 separates the bore into front and rear pressure chambers 10,11 and is coupled to a second piston 1 2 formed integrally with a hollow actuating rod 13, by a telescopic device 14 which limits separation of the pistons, a spring 1 5 serving to urge the pistons axially apart.

A port 1 6 connects the reservoir chamber 6 to the front pressure chamber 10 in the illustrated unactuated condition of the master cylinder, while a further transverse port 1 7 extending through the body 2 connects with the rear pressure chamber 11. The mounting flange 8 is provided with a groove extending about the body 2 and a port1 8 connects the groove with the reservoir chamber 7. A sleeve 20 is fitted over the rear of the body 2, the forward end of the sleeve being received in the groove of flange 8 and sealed to the outer wall of the groove by an O-ring seal 21. A medial portion 22 of the sleeve is crimped or fluted to define axially extending internal fins 23 which slidably engage the outer surface of the body 2.

The rear end of the sleeve 20 is sealed to the actuating rod by a seal 24 which is supported by a seal support member 25 held against the end of the master cylinder housing by an internal shoulder on the sleeve. The member 25 has radial grooves 26 which connect the passages defined between the fins 23 of sleeve 20 with a recuperation chamber 27 for the seal of piston 12. As illustrated, the sleeve 20 is held in position by the main return spring 28 which is interposed between an external shoulder on the sleeve and a collar 29 fitted on the actuating rod.

From the foregoing description it will be understood that the sleeve 20 and the external surface of the body to define a passageway communicating reservoir chamber 7 with the transverse port 1 7 and the recuperation chamber 27.

The operation of the master cylinder will be clear to those skilled in the art and does not require a detailed description. When the actuator rod 1 3 is pushed forwards piston 1 2 slides forward so that its seal cuts off port 17, and piston 9 moves forward so that its seal cuts off port 1 6. Further forward movement of the pistons pressurises the hydraulic fluid in chambers 10 and 11, this pressure being transmitted to the slave cylinders to apply the brakes. Fluid is supplied to the recuperation chamber 27 from reservoir chamber 7 to prevent a vacuum behind the piston 12.

Instead of being made integral with the body 2, the reservoir 4 may be made separately and connected to the body which is provided with the usual connecting boss. In either case port 1 8 can be formed during casting or moulding so that a subsequent machining step is unnecessary.

In Figure 2 there is shown a master cylinder of the same basic form to that described with reference to Figure 1, in combination with a booster. The booster is of known construction and a detailed description of its construction and operation is not considered necessary here.

The booster housing is formed in two halves in well known manner. The front half or part 50 of the housing includes a central tubular portion or sleeve 51 defining a cylindrical recess in which the rear end of the master cylinder body 2 is received so that its mounting flange 8 abuts the front surface of the booster housing and against which it is clamped by the bolts 52 and nuts 53.

The booster housing is sealed to body 2 by a seal 21 located adjacent the mounting flange 8 and a further seal 24 seals the rear end of sleeve 51 to the actuating rod 13 of the master cylinder which projects through the rear end of body 2.

A lower part 54, at least, of the master cylinder reservoir 4 is made integrally with the booster housing part 50 and a passageway 1 8 is included to communicate the reservoir chamber 7 with a longitudinal groove 55 provided on the inside surface of the sleeve 51 and in register with the rear transverse port 1 7 of the master cylinder.

Thus, the booster housing and master cylinder body define between them a passage connecting port 1 7 and reservoir chamber 7. It should be noted here that the port 1 7 intersects a groove 1 7A provided in the wall of the master cylinder bore so that the port communicates with the bore on both sides of the piston seal, whereby a further passage for communicating the reservoir with the recuperation chamber 27 defined in the bore 3 behind the seal of rear piston 12 is no longer necessary.

The operation of the master cylinder when the booster is actuated to push the rod 1 3 forwards will be clearly understood from the description of the Figure 1 embodiment.

The booster housing part 50 including the reservoir and central tubular sleeve 51 as well as the passageway 18 may be moulded from plastics material or, alternatively, may consist of a die-casting.

In the master cylinder shown in Figure 3, the reservoir housing 4 is formed separately from the body 2 rather than integral with it as in Figure 1.

The housing 4 is located on the body by a pin 60 which passes through the wall of body 2 and forms a stop for piston 9, a port 61 leading from reservoir chamber 6 being in register with port 1 6 in the body, and a port 18 leading from reservoir chamber 7 being aligned with a hole 63 through the master cylinder mounting flange 8. The reservoir housing 4 is held on the body 2 by one or more clips (not shown).

Fitted over the end of the body rearwardly of the flange 8 is moulded plastics liner 64 of essentially cup-shape with an axial opening through which the actuating rod 13 passes. The liner 64 includes a longitudinal slot 65 which extends radially the full thickness of the liner, and a forwardly projecting integral tube 66 protruding through the hole 63 in flange 8 and into reservoir port 18 to which it is sealed by a seal 67. The slot 65 communicates at its forward end with the duct of tube 66. intersects the transverse port 1 7 in body 2, and communicates at its rear end with the recuperation chamber 27 behind piston 12.

Enclosing the liner is an outer sleeve 68, for example, of pressed steel, seals 69 and 70 being interposed between the sleeve 68 and the liner at a position in front of slot 65 and between the sleeve 68 and the actuating rod 13, respectively.

A further seal 71 is placed between the liner 64 and the body 2.

From the foregoing description it will be realised that the slot 65 in the liner which is closed on the outside by the sleeve 68, defines with the duct through the tubular extension 66 a passageway communicating the reservoir chamber 7 with the transverse port 1 7 and with the recuperation chamber 27. In assembling the master cylinder the reservoir housing 4 is first mounted on the body, the liner is then placed over the rear end of the body with tube 66 inserted through hole 63 into port 1 8 of the housing, and finally the sleeve 68 is fitted over the liner 64.

While a slot extending through the full width of the liner is preferred for ease of moulding it should be understood that a liner with a groove in place of the slot could be employed, in which case it may be possible to dispense with the outer sleeve altogether provided the necessary seals are established with the body and the actuating rod.

Claims (12)

Claims
1. A master cylinder comprising a body with an axial bore open at the rear end of the body, a reservoir chamber, a transverse port in the body opening into the bore and positioned rearwardly of the reservoir chamber, and a passageway communicating said reservoir chamber with said transverse port, said passageway being defined over at least part of its length between the outside of the body and a member mounted on the body.
2. A master cylinder according to claim 1, wherein said member comprises a sleeve surrounding the body.
3. A master cylinder according to claim 2, wherein the sleeve is a sliding fit on the body and comprises at least one longitudinal groove on the inner surface thereof defining said passageway.
4. A master cylinder according to claim 2 or 3, wherein an actuating rod protrudes through the open end of the bore at the rear end of the body, the sleeve is fitted over and projects beyond the rear end of the body, and a seal is interposed between the projecting portion of the sleeve and the actuating rod.
5. A master cylinder according to any one of claims 1 to 4, wherein said member has a part integral therewith and including a through duct communicating the reservoir chamber with a part of the passageway defined between the member and the body.
6. A master cylinder according to any one of the preceding claims, wherein said member is integral with the housing of a booster assembled with the master cylinder for operating the master cylinder.
7. A master cylinder according to claim 6, wherein said member is a sleeve integral with a front part of the booster housing and defines a recess in which a rear end portion of the master cylinder body is received, and the reservoir chamber is defined within a housing at least part of which is integral with the front part of the booster housing and includes a port connecting the reservoir chamber with the inside surface of the sleeve.
8. A master cylinder according to claim 1 or 2, wherein an element is interposed between the body and said member and defines partly said passageway.
9. A master cylinder according to claim 8, wherein said element includes an integral tubular extension defining a duct communicating the reservoir chamber with the part of the passageway defined between the member and the body.
10. A master cylinder according to claim 8 or 9, wherein said element includes a longitudinal slot partially defining said passageway.
11. A master cylinder substantially as herein described with reference to Figure 1 of the accompanying drawings.
12. A master cylinder substantially as herein described with reference to Figure 2 of the accompanying drawings.
1 3. A master cylinder substantially as herein described with reference to Figure 3 of the accompanying drawings.
GB8122477A 1980-08-14 1981-07-21 Master cylinder Expired GB2082277B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8026497 1980-08-14
GB8122477A GB2082277B (en) 1980-08-14 1981-07-21 Master cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8122477A GB2082277B (en) 1980-08-14 1981-07-21 Master cylinder

Publications (2)

Publication Number Publication Date
GB2082277A true true GB2082277A (en) 1982-03-03
GB2082277B GB2082277B (en) 1984-05-10

Family

ID=26276554

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8122477A Expired GB2082277B (en) 1980-08-14 1981-07-21 Master cylinder

Country Status (1)

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GB (1) GB2082277B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530564A1 (en) * 1982-07-21 1984-01-27 Gen Motors France Master cylinder for a hydraulic braking system
DE3345298A1 (en) * 1982-12-14 1984-06-14 Lucas Ind Plc Master cylinder for a hydraulic braking pressure system
DE3405404A1 (en) * 1983-02-15 1984-08-16 Lucas Ind Plc Master cylinder for vehicle braking system
US4702078A (en) * 1983-03-31 1987-10-27 Lucas Industries Public Limited, Co. Master cylinder
GB2194008A (en) * 1986-07-30 1988-02-24 Teves Gmbh Alfred Automotive vehicle braking device
GB2197400A (en) * 1986-10-24 1988-05-18 Lucas Ind Plc Pressure cylinder
FR2629033A1 (en) * 1988-03-25 1989-09-29 Bendix France Hydraulic brake servomotor with remote control from pedal - has master cylinder providing auxiliary circuit which opens servo control valve to initiate braking assistance
US5253477A (en) * 1991-05-03 1993-10-19 Lucas Industries Public Limited Company Master cylinder and booster assemblies
GB2276685A (en) * 1993-04-02 1994-10-05 Automotive Products Plc Master cylinder
US6935110B2 (en) 2001-12-20 2005-08-30 Trw Limited Tandem master cylinders for hydraulic systems
WO2015063654A1 (en) * 2013-10-29 2015-05-07 Freni Brembo S.P.A. Lever actuated device for a brake and/or a clutch, in particular for motorcycles

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530564A1 (en) * 1982-07-21 1984-01-27 Gen Motors France Master cylinder for a hydraulic braking system
DE3345298A1 (en) * 1982-12-14 1984-06-14 Lucas Ind Plc Master cylinder for a hydraulic braking pressure system
FR2537522A1 (en) * 1982-12-14 1984-06-15 Lucas Ind Plc Master cylinder for brake systems for vehicles
US4703624A (en) * 1983-02-15 1987-11-03 Lucas Industries Master cylinder for vehicle braking system
DE3405404A1 (en) * 1983-02-15 1984-08-16 Lucas Ind Plc Master cylinder for vehicle braking system
US4702077A (en) * 1983-02-15 1987-10-27 Lucas Industries Master cylinder for vehicle braking system
US4702078A (en) * 1983-03-31 1987-10-27 Lucas Industries Public Limited, Co. Master cylinder
GB2194008B (en) * 1986-07-30 1990-08-15 Teves Gmbh Alfred Automotive vehicle braking device
GB2194008A (en) * 1986-07-30 1988-02-24 Teves Gmbh Alfred Automotive vehicle braking device
US4819996A (en) * 1986-07-30 1989-04-11 Alfred Teves Gmbh Automotive vehicle braking device
GB2197400A (en) * 1986-10-24 1988-05-18 Lucas Ind Plc Pressure cylinder
FR2629033A1 (en) * 1988-03-25 1989-09-29 Bendix France Hydraulic brake servomotor with remote control from pedal - has master cylinder providing auxiliary circuit which opens servo control valve to initiate braking assistance
US5253477A (en) * 1991-05-03 1993-10-19 Lucas Industries Public Limited Company Master cylinder and booster assemblies
GB2276685A (en) * 1993-04-02 1994-10-05 Automotive Products Plc Master cylinder
GB2276685B (en) * 1993-04-02 1996-09-18 Automotive Products Plc A master cylinder
US6935110B2 (en) 2001-12-20 2005-08-30 Trw Limited Tandem master cylinders for hydraulic systems
WO2015063654A1 (en) * 2013-10-29 2015-05-07 Freni Brembo S.P.A. Lever actuated device for a brake and/or a clutch, in particular for motorcycles

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Legal Events

Date Code Title Description
727 Application made for amendment of specification (sect. 27/1977)
727B Case decided by the comptroller ** specification amended (sect. 27/1977)
SPA Amended specification published
PE20 Patent expired after termination of 20 years

Effective date: 20010720