GB1385180A - Vehicles having hydraulically operated braking systems - Google Patents
Vehicles having hydraulically operated braking systemsInfo
- Publication number
- GB1385180A GB1385180A GB5250270A GB5250270A GB1385180A GB 1385180 A GB1385180 A GB 1385180A GB 5250270 A GB5250270 A GB 5250270A GB 5250270 A GB5250270 A GB 5250270A GB 1385180 A GB1385180 A GB 1385180A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- spool
- valve
- brakes
- load
- 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
- B60T8/18—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 vehicle weight or load, e.g. load distribution
- B60T8/1837—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 vehicle weight or load, e.g. load distribution characterised by the load-detecting arrangements
- B60T8/185—Arrangements for detecting vehicle level
-
- 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
- B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Control Valves For Brake Systems (AREA)
Abstract
1385180 Differential braking; load responsive braking JONAS WOODHEAD Ltd 4 Feb 1972 [4 Nov 1970] 52502/70 Heading F2F A vehicle hydraulic braking system with front and rear brakes has a spool valve 1 situated in a line leading to the rear brakes, and the spool 5 of the valve 1 is acted upon both by a force dependent on the loading of the rear wheel or wheels and by the pressure to the rear brakes, whereby the same hydraulic pressure is applied to the front brakes and the rear brakes until a certain brake pressure which is dependent on the instantaneous loading of the rear wheel or wheels is achieved and thereafter the pressure applied to the rear brakes varies with the instantaneous loading on the rear wheel or wheels. As shown in Fig. 1, the valve 1 acts to control communication between connections 2 and 3 which are respectively connected to the master cylinder front brake lines and the rear brakes and the spool 5 has a gallery 25 and bores 26, 27. The spool 5 is connected to a rigid inverted cup 6 in which is seated one end of a spring 7, the other end of which is seated in a sleeve 8: the sleeve 8 is pivoted at 9 to an arm 10 one end of which is pivoted at 11 to the body of the vehicle and the other end of which is connected by an adjustable link 12 to the rear axle. As pressure builds up during braking the pressure at the rear brakes is applied to spool 5 adjacent the connection 3, the force from this being opposed by the load of the spring 7, which load depends upon the instantaneous distance between the rear axle and a fixed point on the body of the vehicle. Thus at some stage during an increase in brake fluid pressure the spool 5 will move against spring 7 to isolate connection 3 from connection 2. If the rear wheels are now moved downwardly relative to the body due to high deceleration or a dip in the road, the valve spool 5 will move away from the connection 3 to reduce the pressure at the rear brakes; if the rear wheels move upwardly the spool 5 will move to increase the pressure in the rear brakes, and may restablish communication between the connections 2, 3 to further increase the pressure. When master cylinder pedal pressure is released fluid passes from connection 3 to connection 2 via passages (32, 33) and a non-return valve (29, 30, 31) as illustrated in Figs. 2, 3 (not shown). The embodiment of Fig. 4 illustrates a valve for use where at least part of the load of the vehicle is carried by adjustable fluid pressure operated devices having a self-levelling characteristic. The valve has an inlet 40 connected to the suspension devices and opens to a chamber 41 at the bottom of the valve spool 5. The chamber 41 contains a light spring 42 if the whole load of the rear axle is taken by the fluid pressure suspension devices but where this is not the case. the spring 42 is replaced by a compression spring of a strength related to the proportion of the load which is taken by the mechanical devices. A force proportional to the suspension pressure acts on the spool 5 and this pressure is proportional to the distance between the rear axle and a fixed point on the body. The spool 5 may be stepped.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5250270A GB1385180A (en) | 1970-11-04 | 1970-11-04 | Vehicles having hydraulically operated braking systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB5250270A GB1385180A (en) | 1970-11-04 | 1970-11-04 | Vehicles having hydraulically operated braking systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1385180A true GB1385180A (en) | 1975-02-26 |
Family
ID=10464168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5250270A Expired GB1385180A (en) | 1970-11-04 | 1970-11-04 | Vehicles having hydraulically operated braking systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1385180A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2852370A1 (en) * | 1977-12-08 | 1979-06-13 | Dba Sa | DEVICE FOR REGULATING THE BRAKE PRESSURE OF A VEHICLE |
FR2495079A1 (en) * | 1980-11-28 | 1982-06-04 | Dba | Braking pressure control device - has tension spring applying force tending to reduce brake pressure |
EP0053528A1 (en) * | 1980-11-28 | 1982-06-09 | Societe Anonyme D.B.A. | Brake pressure proportioning valve |
US4441590A (en) * | 1978-08-04 | 1984-04-10 | Brembo S.P.A. | Braking system for motor vehicle |
FR2583689A1 (en) * | 1985-06-20 | 1986-12-26 | Bendix France | Brake adjuster of the load-controlled type for motor vehicles |
-
1970
- 1970-11-04 GB GB5250270A patent/GB1385180A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2852370A1 (en) * | 1977-12-08 | 1979-06-13 | Dba Sa | DEVICE FOR REGULATING THE BRAKE PRESSURE OF A VEHICLE |
FR2411114A1 (en) * | 1977-12-08 | 1979-07-06 | Dba | Load regulated brake control valve - operates with single pivoted lever fitted with adjustable stop |
US4441590A (en) * | 1978-08-04 | 1984-04-10 | Brembo S.P.A. | Braking system for motor vehicle |
FR2495079A1 (en) * | 1980-11-28 | 1982-06-04 | Dba | Braking pressure control device - has tension spring applying force tending to reduce brake pressure |
EP0053528A1 (en) * | 1980-11-28 | 1982-06-09 | Societe Anonyme D.B.A. | Brake pressure proportioning valve |
US4448457A (en) * | 1980-11-28 | 1984-05-15 | Societe Anonyme Dba | Braking pressure corrector |
FR2583689A1 (en) * | 1985-06-20 | 1986-12-26 | Bendix France | Brake adjuster of the load-controlled type for motor vehicles |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |