GB1512384A - Fluid pressure braking systems - Google Patents
Fluid pressure braking systemsInfo
- Publication number
- GB1512384A GB1512384A GB5146377A GB5146377A GB1512384A GB 1512384 A GB1512384 A GB 1512384A GB 5146377 A GB5146377 A GB 5146377A GB 5146377 A GB5146377 A GB 5146377A GB 1512384 A GB1512384 A GB 1512384A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- skid
- port
- valve
- space
- 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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/42—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition having expanding chambers for controlling pressure, i.e. closed systems
- B60T8/4208—Debooster systems
- B60T8/4225—Debooster systems having a fluid actuated expansion unit
-
- 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
-
- 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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
- B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
- B60T8/363—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems
- B60T8/3635—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems switching between more than two connections, e.g. 3/2-valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Regulating Braking Force (AREA)
Abstract
1512384 Anti-skid braking systems AUTOMOTIVE PRODUCTS Ltd 29 April 1975 [30 Jan 1974] 51463/77 Divided out of 1512383 Heading F2F A vehicle anti-skid brake pressure modulator 28 comprises an actuating means 62 (Fig. 4) (operated by a solenoid 60) responsive to an incipient skid signal to move a valve member 57 to connect a space 48 (Fig. 2) to a fluid reservoir port 34, (Fig. 4), the valve member including a flow restriction 78 which is effective to produce a pressure differential across the valve member when the space 48 is connected to the port 34 in opposition to the force of the actuating means 62 so that when the signal ceases the differential pressure causes the valve member to move to close the connection between the space 48 and the port 34. In the hydraulic system shown in Fig. 1 a drivers brake control device 19 includes a control valve part 20 connected to a reservoir 15 and a pressure liquid accumulator 17 and to two front brake actuators 12 and through ports 29, 31 of the modulator 28 a rear brake actuator 14; and a master cylinder part 21 connected to the reservoir 15 and to front brake actuators 13 and through ports 30, 32 with the other rear brake actuator 14. The anti-skid control device 28 comprises two parallel angular passages, between the ports 29, 31 and 30, 32 each containing a ball cut-off valve 41, (42) controlled by a pin 81, (82) extending from a plunger 79, (80) which, when moved to the left by fluid pressure, closes the cut-off valve and increases the volume available to the fluid of the rear brake actuators 14 to release the brakes. The device 28 further comprises a stepped bore 37 containing a plunger 43 with a flange 45 at the right hand end (Fig. 2) for controlling the plungers 79, 80 together, a central part-conical portion 52 defining a pressurized space 53 connected via a control port 33 with the accumulator 17 and at the left hand end a head, acted on by a coil spring 46 and fluid pressure, and defining the space 48 which is selectively connected through a passage (not shown) an annulus 61 and radial passages 71 with the pressurized control port 33 or the reservoir port 34 by the land 64 of the anti-skid valve element 57. In normal operation, the plunger 43 and hence the plungers 79, 80 and the cut-off valves are urged to the right by the spring 46 and the pressure fluid in the chamber 47 which communicates with the space 48 through a passage 49 and bore 51. In response to an incipient skid the chamber 48 and through the passage 49 and a by-pass valve 50, the chamber 47 are connected to the reservoir when the accumulator pressure in the space 53 moves the plunger 43 to the left permitting the cut-off valves to close. The valve element 57 includes a cup-shaped portion 75, with the flow restriction 78, slidable on a cylindrical portion 65 with an 0-ring 76 between the portion 75 and a radial flange 74. If there is a failure in the pressure port 20 or an associated port or line the spring 46 will keep the shut-off valves open so the rear brakes are controlled by the pedal 22. If there is a failure in the master cylinder sub-system the skid sensor is still effective but brake release is delayed and reapplication is sooner than normal. The loading of the spring 46 is less than the opposed pressure loading on both plungers 79, 80 in normal use but more than the loading on one plunger so that if one line to a rear brake fails the other cut-off valve is held open rendering the anti-skid device ineffective.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5146377A GB1512384A (en) | 1974-01-30 | 1975-04-29 | Fluid pressure braking systems |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB429874A GB1512382A (en) | 1974-01-30 | 1974-01-30 | Fluid pressure braking systems |
GB5054474 | 1974-01-30 | ||
GB2766174A GB1512383A (en) | 1974-01-30 | 1975-04-29 | Fluid pressure braking systems |
GB5146377A GB1512384A (en) | 1974-01-30 | 1975-04-29 | Fluid pressure braking systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1512384A true GB1512384A (en) | 1978-06-01 |
Family
ID=27447366
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5146377A Expired GB1512384A (en) | 1974-01-30 | 1975-04-29 | Fluid pressure braking systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1512384A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2133096A (en) * | 1982-10-29 | 1984-07-18 | Honda Motor Co Ltd | Preventing wheel lock during braking |
WO1989005747A1 (en) * | 1987-12-23 | 1989-06-29 | Automotive Products Plc | Vehicle antilock braking systems |
-
1975
- 1975-04-29 GB GB5146377A patent/GB1512384A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2133096A (en) * | 1982-10-29 | 1984-07-18 | Honda Motor Co Ltd | Preventing wheel lock during braking |
WO1989005747A1 (en) * | 1987-12-23 | 1989-06-29 | Automotive Products Plc | Vehicle antilock braking systems |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |