GB1460384A - Hydraulic servomechanisms - Google Patents
Hydraulic servomechanismsInfo
- Publication number
- GB1460384A GB1460384A GB2865674A GB2865674A GB1460384A GB 1460384 A GB1460384 A GB 1460384A GB 2865674 A GB2865674 A GB 2865674A GB 2865674 A GB2865674 A GB 2865674A GB 1460384 A GB1460384 A GB 1460384A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- chamber
- valve
- power cylinder
- bore
- 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
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
- 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
- B60T13/14—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 accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/143—Master cylinder mechanically coupled with booster
- B60T13/144—Pilot valve provided inside booster piston
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
1460384 Hydraulic servomechanisms NISSHIN KOGYO KK 27 June 1974 [24 April 1974] 28656/74 Heading F2F An hydraulic servomechanism for operating the piston 1 of a brake master cylinder M comprises an output piston 2 in a power cylinder P, a servo piston 6 and an input piston 28 and a valve arrangement 16, 22, 24 which is operated on actuating movement of the piston 28 to close off a low pressure chamber B and to connect a high pressure chamber A to the power cylinder P to operate the piston 2 and thereby actuate the master cylinder M. The servo piston 6 which defines the chambers A, B has an integral piston rod 6a which is slidably arranged in power cylinder P to serve as a stop for piston 2 and the piston 6 is formed at its leftward end with an annular flange 7 slidably arranged in a large-diameter portion of a shouldered bore 4 of a casing C connected to power cylinder P. The flange 7 is formed with radial notches (7a). The high pressure chamber A is connected by a line L including an accumulator 9 to a pump 8 and the low pressure chamber B is connected via a low pressure line L<SP>1</SP> incorporating a pressure relief valve 11 with a reservoir 10. The servo-piston 6 has an axial bore 13 to receive a stopper element 14 defining a valve chamber 15 which is communicable through a port 18, a bore 19 and bores 20 in the piston rod 6a with the high pressure chamber A. The valve chamber 15 also communicates through passages 21 with power cylinder P. A valve element 16 is slidably arranged in the chamber 15 and has a rod 24 for engagement with a spring biased ball valve element 22. The input piston 28 is slidably arranged in a bore 26 in the stopper element 14 and defines therein a reaction chamber R. The piston 28 has an extension 29 which extends into an annular flange 27 on the stopper element 14 and defines an annular opening 30 therewith. The input piston 28 has an outlet port 34 formed therein which communicates with pressure chamber B through bores 33. An operating rod 36 connected to a brake pedal is connected with piston 28 by way of a rubber cushioning member 35. The servomechanism as shown is in its normal inoperative position with the high pressure chamber A filled with hydraulic fluid. When the input piston 28 is driven leftwardly the projection 29 comes into abutment with valve element 16 to close outlet port 34 and the valve element 16 is driven leftwardly to move valve element 22 to open inlet port 18. The power cylinder P is fed with hydraulic fluid under pressure from chamber A through bores 20, port 18, valve chamber 15 and bores 21 and the piston 2 is driven leftwardly. Part of the hydraulic fluid entering valve chamber 15 is directed into reaction chamber R through opening 30 and acts on the input piston 28 to provide reaction for the operator. When the input piston 28 is released the elements 16, 22 operate to disconnect the power cylinder P from chamber A and to connect it to chamber B. The relief valve 11 opens to connect chamber B to reservoir 10 and closes when the pressure in chambers B, R and in cylinder P falls to a predetermined level. Should the hydraulic supply system fail operation of piston 28 causes abutting engagement of piston 28 and flange 27 and the piston 6 is then driven leftwardly through stopper element 14 to move piston 2. When the piston 6 has advanced a certain distance the piston 6 leaves the smaller diameter portion of bore 4 and the chambers A, B are placed in communication via notches (7a), and thus any fluid in chamber A flows into chamber B and cannot restrain movement of piston 6.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4617774A JPS5339953B2 (en) | 1974-04-24 | 1974-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1460384A true GB1460384A (en) | 1977-01-06 |
Family
ID=12739733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2865674A Expired GB1460384A (en) | 1974-04-24 | 1974-06-27 | Hydraulic servomechanisms |
Country Status (3)
Country | Link |
---|---|
US (1) | US3926093A (en) |
JP (1) | JPS5339953B2 (en) |
GB (1) | GB1460384A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105416261A (en) * | 2015-12-17 | 2016-03-23 | 芜湖盛力科技股份有限公司 | Air-over-hydraulic air boosting pump of loader |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50155874A (en) * | 1974-06-10 | 1975-12-16 | ||
JPS595468B2 (en) * | 1975-02-07 | 1984-02-04 | アイシンセイキ カブシキガイシヤ | Your Tsushiki Power Brake Souch |
FR2303185A1 (en) * | 1975-03-04 | 1976-10-01 | Dba | HYDRAULIC SERVO-MOTOR |
DE2531264C2 (en) * | 1975-07-12 | 1986-10-02 | Robert Bosch Gmbh, 7000 Stuttgart | Master brake cylinder for dual circuit brake systems |
FR2332445A1 (en) * | 1975-11-21 | 1977-06-17 | Dba | HYDRAULIC AMPLIFIER |
GB1533546A (en) * | 1977-08-31 | 1978-11-29 | Ford Motor Co | Air hydraulic brake actuator |
US4290340A (en) * | 1978-11-10 | 1981-09-22 | Aisin Seiki Kabushiki Kaisha | Hydraulic booster |
JPS6194865A (en) * | 1984-10-17 | 1986-05-13 | Jidosha Kiki Co Ltd | Loss stroke reducing device for liquid pressure toggle joint |
US4685297A (en) * | 1985-10-30 | 1987-08-11 | Allied Corporation | Hydraulic brake booster with quick take-up and full stroke |
US4665701A (en) * | 1985-10-30 | 1987-05-19 | Allied Corporation | Hydraulic brake booster with quick take-up and reduced stroke |
JPH01111562A (en) * | 1987-10-26 | 1989-04-28 | Nissin Kogyo Kk | Hydraulic type booster unit |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3126794A (en) * | 1964-03-31 | ayers | ||
US1708173A (en) * | 1927-08-18 | 1929-04-09 | Ingersoll Rand Co | Submarine drill |
US3106874A (en) * | 1961-09-08 | 1963-10-15 | Bendix Corp | Control valve actuating structure |
US3115067A (en) * | 1961-09-11 | 1963-12-24 | Kelsey Hayes Co | Power brake for motor vehicles |
US3093119A (en) * | 1961-10-30 | 1963-06-11 | Kelsey Hayes Co | Fluid pressure motor |
US3252382A (en) * | 1964-03-05 | 1966-05-24 | Gen Motors Corp | Fluid pressure servomotor reaction control mechanism |
GB1203889A (en) * | 1967-10-30 | 1970-09-03 | Bendix Corp | Improvements in and relating to fluid pressure control valves |
JPS4846760A (en) * | 1971-10-16 | 1973-07-03 |
-
1974
- 1974-04-24 JP JP4617774A patent/JPS5339953B2/ja not_active Expired
- 1974-06-06 US US477064A patent/US3926093A/en not_active Expired - Lifetime
- 1974-06-27 GB GB2865674A patent/GB1460384A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105416261A (en) * | 2015-12-17 | 2016-03-23 | 芜湖盛力科技股份有限公司 | Air-over-hydraulic air boosting pump of loader |
Also Published As
Publication number | Publication date |
---|---|
JPS5339953B2 (en) | 1978-10-24 |
US3926093A (en) | 1975-12-16 |
JPS50139276A (en) | 1975-11-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |