GB2025548A - Master cylinders - Google Patents

Master cylinders Download PDF

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Publication number
GB2025548A
GB2025548A GB7828574A GB7828574A GB2025548A GB 2025548 A GB2025548 A GB 2025548A GB 7828574 A GB7828574 A GB 7828574A GB 7828574 A GB7828574 A GB 7828574A GB 2025548 A GB2025548 A GB 2025548A
Authority
GB
United Kingdom
Prior art keywords
reservoir
master cylinder
bore
spigots
spigot
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.)
Withdrawn
Application number
GB7828574A
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Priority to GB7828574A priority Critical patent/GB2025548A/en
Publication of GB2025548A publication Critical patent/GB2025548A/en
Withdrawn legal-status Critical Current

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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
    • B60T11/22—Master control, e.g. master cylinders characterised by being integral with reservoir

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)

Abstract

A master cylinder and reservoir assembly comprises a reservoir (5) sealingly secured to a master cylinder body. To obviate the use as piston stops of spring clips within the master cylinder bore or of pegs extending through the master cylinder body, the reservoir (5) has a spigot (6) which extends into the bore (2) through an aperture in the master cylinder body and serves both to locate the reservoir on the master cylinder (1) and as a stop for a piston (3). <IMAGE>

Description

SPECIFICATION Master cylinders This invention relates generally to master cylinder and reservoir assemblies.
In known assemblies rearward movement of the piston is limited by a stop which may be in the form of a spring clip fitted in the master cylinder bore or a peg extending through the wall of the master cylinder into the bore. Such known assemblies have the disadvantage that an element, either the peg or circlip, is required and steps are required in manufacture to form the hole for the peg or a circumferential groove for the spring clip and in assembly to locate the peg or circlip after the piston is inserted in the bore.
The present invention aims to overcome that disadvantage and provides a master cylinder and reservoir assembly in which the reservoir has a depending spigot extending from the lower surface of the reservoir and protruding through an aperture in the wall of the master cylinder into the bore, the spigot providing a stop engageable by a piston slidably in the bore.
Preferably, the spigot is hollow and commu nicates 'the reservoir with the master cylinder bore.
The illustrated assembly is for use with a vehicle dual circuit braking system and comprises the master cylinder 1 having a bore 2 within which two pistons 3 are slidable, the pistons being biased rearwardly by respective springs 4.
A master cylinder and reservoir assembly in accordance with the invention will now be described, by way of example, with reference to the accompanying drawing which shows the master cylinder in axial cross-section and the reservoir partly in section.
The illustrated assembly is for use with a vehicle dual circuit braking system and comprises the master cylinder 1 having a bore 2 within which two pistons 3 are slidable, the pistons being biased rearwardly by respective springs 4.
The reservoir 5 is of plastics material and has two depending spigots 6 extending from the bottom of the reservoir through corresponding apertures in the wall of the cylinder 1 and into the cylinder bore 2. The spigots 6 provide stops to limit rearward movement of the respective pistons 3. In the illustrated assembly the spigots 6 are hollow to provide fluid communication between the reservoir 5 and the bore 2.
To assemble the reservoir on the master cylinder, the pistons are pushed forwardly and the spigots simply pushed into the apertures in the cylinder wall, the spigots being a close fit in the apertures. The pistons are then released and adopt the illustrated positions.
It will be seen that the spigots 6 serve three purposes, namely to locate the reservoir 5 on the master cylinder 1, to provide fluid communication between the reservoir and the cylinder bore, and to act as stops for the pistons.
The spigots 6 may be integrally moulded with the reservoir, as illustrated, or they may be separate members attached to the bottom of the reservoir. The spigots may, for example, be of metal and moulded into the bottom surface of the reservoir for use with master cylinders where a more robust piston stop is required.
1. A master cylinder and reservoir assembly in which the reservoir has a depending spigot extending from the lower surface of the reservoir and protruding through an aperture in the wall of the master cylinder into the bore, the spigot providing a stop engageable by a piston slidable in the bore.
2. An assembly according to claim 1, wherein the spigot is hollow and communicates the reservoir with the master cylinder bore.
3. An assembly according to claim 1 or 2, wherein the spigot is a close fit in the aperture in the master cylinder wall.
4. An assembly according to any of claims 1 to 3, wherein the spigot is integral with the reservoir.
5. An assembly according to any of claims 1 to 4, wherein the spigot is one of a plurality of spigots, one for each piston slidable in the bore.
6. A master cylinder and reservoir assembly constructed and arranged substantially as herein described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Master cylinders This invention relates generally to master cylinder and reservoir assemblies. In known assemblies rearward movement of the piston is limited by a stop which may be in the form of a spring clip fitted in the master cylinder bore or a peg extending through the wall of the master cylinder into the bore. Such known assemblies have the disadvantage that an element, either the peg or circlip, is required and steps are required in manufacture to form the hole for the peg or a circumferential groove for the spring clip and in assembly to locate the peg or circlip after the piston is inserted in the bore. The present invention aims to overcome that disadvantage and provides a master cylinder and reservoir assembly in which the reservoir has a depending spigot extending from the lower surface of the reservoir and protruding through an aperture in the wall of the master cylinder into the bore, the spigot providing a stop engageable by a piston slidably in the bore. Preferably, the spigot is hollow and commu nicates 'the reservoir with the master cylinder bore. The illustrated assembly is for use with a vehicle dual circuit braking system and comprises the master cylinder 1 having a bore 2 within which two pistons 3 are slidable, the pistons being biased rearwardly by respective springs 4. A master cylinder and reservoir assembly in accordance with the invention will now be described, by way of example, with reference to the accompanying drawing which shows the master cylinder in axial cross-section and the reservoir partly in section. The illustrated assembly is for use with a vehicle dual circuit braking system and comprises the master cylinder 1 having a bore 2 within which two pistons 3 are slidable, the pistons being biased rearwardly by respective springs 4. The reservoir 5 is of plastics material and has two depending spigots 6 extending from the bottom of the reservoir through corresponding apertures in the wall of the cylinder 1 and into the cylinder bore 2. The spigots 6 provide stops to limit rearward movement of the respective pistons 3. In the illustrated assembly the spigots 6 are hollow to provide fluid communication between the reservoir 5 and the bore 2. To assemble the reservoir on the master cylinder, the pistons are pushed forwardly and the spigots simply pushed into the apertures in the cylinder wall, the spigots being a close fit in the apertures. The pistons are then released and adopt the illustrated positions. It will be seen that the spigots 6 serve three purposes, namely to locate the reservoir 5 on the master cylinder 1, to provide fluid communication between the reservoir and the cylinder bore, and to act as stops for the pistons. The spigots 6 may be integrally moulded with the reservoir, as illustrated, or they may be separate members attached to the bottom of the reservoir. The spigots may, for example, be of metal and moulded into the bottom surface of the reservoir for use with master cylinders where a more robust piston stop is required. CLAIMS
1. A master cylinder and reservoir assembly in which the reservoir has a depending spigot extending from the lower surface of the reservoir and protruding through an aperture in the wall of the master cylinder into the bore, the spigot providing a stop engageable by a piston slidable in the bore.
2. An assembly according to claim 1, wherein the spigot is hollow and communicates the reservoir with the master cylinder bore.
3. An assembly according to claim 1 or 2, wherein the spigot is a close fit in the aperture in the master cylinder wall.
4. An assembly according to any of claims 1 to 3, wherein the spigot is integral with the reservoir.
5. An assembly according to any of claims 1 to 4, wherein the spigot is one of a plurality of spigots, one for each piston slidable in the bore.
6. A master cylinder and reservoir assembly constructed and arranged substantially as herein described with reference to the accompanying drawing.
GB7828574A 1978-07-03 1978-07-03 Master cylinders Withdrawn GB2025548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7828574A GB2025548A (en) 1978-07-03 1978-07-03 Master cylinders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7828574A GB2025548A (en) 1978-07-03 1978-07-03 Master cylinders

Publications (1)

Publication Number Publication Date
GB2025548A true GB2025548A (en) 1980-01-23

Family

ID=10498221

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7828574A Withdrawn GB2025548A (en) 1978-07-03 1978-07-03 Master cylinders

Country Status (1)

Country Link
GB (1) GB2025548A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615175A (en) * 1980-06-14 1986-10-07 Nippon Air Brake Co., Ltd. Hydraulic reservoir in tandem master cylinder
US5063743A (en) * 1989-05-17 1991-11-12 Jidosha Kiki Co., Ltd. Master cylinder with parts assembled for easy removal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615175A (en) * 1980-06-14 1986-10-07 Nippon Air Brake Co., Ltd. Hydraulic reservoir in tandem master cylinder
US5063743A (en) * 1989-05-17 1991-11-12 Jidosha Kiki Co., Ltd. Master cylinder with parts assembled for easy removal

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)