GB547041A - Improvements in or relating to liquid pressure braking systems - Google Patents
Improvements in or relating to liquid pressure braking systemsInfo
- Publication number
- GB547041A GB547041A GB1667/41A GB166741A GB547041A GB 547041 A GB547041 A GB 547041A GB 1667/41 A GB1667/41 A GB 1667/41A GB 166741 A GB166741 A GB 166741A GB 547041 A GB547041 A GB 547041A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- passage
- reservoir
- chamber
- liquid
- 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.)
- Expired
Links
- 239000007788 liquid Substances 0.000 title abstract 7
- 238000007789 sealing Methods 0.000 abstract 2
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
- B60T11/224—Master control, e.g. master cylinders with pressure-varying means, e.g. with two stage operation provided by use of different piston diameters including continuous variation from one diameter to another
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
Abstract
547,041. Hydraulic master cylinders. HYDRAULIC BRAKE CO. Feb. 7, 1941, No. 1667. Convention date, Feb. 7, 1940. [Class 103 (i)] In hydraulic master cylinders, for operating brakes, comprising a relatively large diameter piston effective for moving the brake shoes into contact with the drums and a smaller diameter piston by which the braking pressure is applied, the larger piston is gradually rendered ineffective during an operation by the provision of a restricted passage connecting the chamber in front of the larger piston with the reservoir. Relatively large and small pistons 66, 82 move in chambers 32, 34 of the cylinder 24. In the release position of the pistons, these chambers communicate with the reservoir 10 through ports 38, 28. A chamber 70 between the piston 66 and a head 72 is constantly open to the reservoir through a passage 26. A restricted passage 88 and a passage 86 closed at one end by a plug 92 connects the chambers 32,70. The passage 88 is restricted by a wire inserted therein. During initial movement of the pistons to apply the brake, liquid is displaced by the large piston 66 from chamber 32 through passages 94 in piston 82 past the sealing cup 96 to chamber 34 thence to the brakes by the port 42. Liquid also flows slowly from the chamber 32 at this stage through the passage 88 to the reservoir. A large volume of liquid is thus displaced from chamber 34 but when due to the application of the brake shoes to the drum the pressure of the liquid rises substantially, the flow through the passage 88 increases so that the pressure of the liquid is gradually transferred from the piston 66 to the smaller piston 82. During retraction of the pistons liquid is drawn into the chambers 34, 32 from the reservoir through passages 76, 94 in the pistons and past the sealing cups 78, 96, excess subsequently returning to the reservoir through ports 38, 28.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US317741A US2273924A (en) | 1940-02-07 | 1940-02-07 | Fluid pressure braking system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB547041A true GB547041A (en) | 1942-08-11 |
Family
ID=23235071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1667/41A Expired GB547041A (en) | 1940-02-07 | 1941-02-07 | Improvements in or relating to liquid pressure braking systems |
Country Status (2)
Country | Link |
---|---|
US (1) | US2273924A (en) |
GB (1) | GB547041A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2674097A (en) * | 1950-07-27 | 1954-04-06 | John S Holmes | Master cylinder having a booster in combination therewith |
US2881801A (en) * | 1956-04-19 | 1959-04-14 | Automatic Switch Co | Pilot-operated three-way valve |
EP0081319B1 (en) * | 1981-12-04 | 1986-01-29 | Automotive Products Public Limited Company | Hydraulic master cylinder |
-
1940
- 1940-02-07 US US317741A patent/US2273924A/en not_active Expired - Lifetime
-
1941
- 1941-02-07 GB GB1667/41A patent/GB547041A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2273924A (en) | 1942-02-24 |
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