GB1596228A - Vehicle braking system - Google Patents
Vehicle braking system Download PDFInfo
- Publication number
- GB1596228A GB1596228A GB14859/78A GB1485978A GB1596228A GB 1596228 A GB1596228 A GB 1596228A GB 14859/78 A GB14859/78 A GB 14859/78A GB 1485978 A GB1485978 A GB 1485978A GB 1596228 A GB1596228 A GB 1596228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vehicle
- damper unit
- spring
- lever
- actuating member
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 230000002040 relaxant effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Control Valves For Brake Systems (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
- Vehicle Body Suspensions (AREA)
- Fluid-Damping Devices (AREA)
- Regulating Braking Force (AREA)
- Safety Valves (AREA)
Description
(54) A VEHICLE BRAKING SYSTEM
(71) We, SOCIETE ANONYME
AUTOMOBILES CITROEN, of 117 a 167
Quai André Citroën, 75747 Paris, Cedex 15,
France and AUTOMOBILES PEUGEOT, of 75 avenue de la Grande Armee, 75016
Paris, France, both French Body
Corporates, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to brake pressure limiters.
According to the present invention there is provided a vehicle having a braking system and a brake pressure limiter for limiting the maximum pressure applicable to the braking system, the limiter having an actuating member which is movable to alter the maximum pressure, a wheel assembly of the vehicle being connected to the body of the vehicle by a damper unit which has a part mounted pivotally on the body and which is arranged in such a way that displacement of the wheel assembly relative to the body causes angular displacement of that part relative to the body, the actuating member of the brake pressure limiter being resiliently connected to that part of the damper unit, whereby the position of the actuating member is a function of the load carried by the vehicle.
For a-better understanding of the present invention and to show how it may be carried into effect, reference will now be made, by way of example only, to the accompanying drawings, in which:
Figure 1 is a general view in elevation of a brake pressure limiter connected to a damper unit; and
Figure 2 is a general view elevation showing another form of connection between a brake pressure limiter and a damper unit.
Figure 1 shows a chassis of a vehicle to which is connected a brake pressure limiter 5 by means of screws 3 and 4 screwed onto a plate 2 which is welded onto the chassis 1.
One end of a hydropneumatic telescopic damper unit 7 is also connected to the chassis by a hinge 6. The other end of this damper unit 7 is anchored by a hinge 8 to a wheel support arm 9 forming part of a wheel assembly. The telescopic damper unit 7 is inclined to the vertical and comprises a protective member 10.
The brake pressure limiter has an actuating member in the form of a lever 11 which is mounted to pivot about an axis 12.
One end of the lever 11 has a cam surface 13 positioned to act on a piston or slide valve spool 14 of the braking pressure limiter (see
Figure 2). The other end 15 of the lever 11 is connected to one end 16a of a resilient member constituted by a spring 16; the other end 16b of the spring 16 is connected to that member of the telescopic damper unit 7 which is secured to the spring part of the vehicle, i.e. the chassis 1.
In the embodiment of Figure 1, the end
16b of the spring 16 is provided with a hook engaged in a hole in a lug 18 which is welded on to the protective member 10 of the telescopic damper unit 7.
In the embodiment of Figure 2, the end 16b of the spring 16 engages a hole in a spring fitting 21 mounted at the end of a lever 22 which is welded on to a sleeve which forms part of the hinge 6; the end 16b is clamped in the spring fitting by a screw 23.
In operation of the limiter, as shown in Figure -2, the cam surface 13 operates the slide valve spool 14, a groove 25 in the spool 14 normally connecting an inlet 26 with an outlet 27 leading to the brakes. The outlet side is also connected to a chamber 28 containing a spring 29 biasing the slide valve 14 towards a position in which the inlet and the outlet 27 are in communication. A nonreturn valve 31 is provided between the chamber 28 and the inlet 26.
Operation is as follows:
Due to the oblique position of the telescopic damper unit, vertical movement of the vehicle chassis I when the load changes gives rise to changes in the position of the lower end of the damper unit between the points P1 (vehicle empty) and P2 (vehicle fully loaded). The axis of the damper unit is displaced angularly between the positions
A, (vehicle empty) and A2 (vehicle fully loaded). It is possible for the damper unit to make vertical movements up to point P3 and angular displacements as far as the position
A3 to absorb bumps in the ground and vehicle movements caused by acceleration and deceleration. It will be appreciated that the angular displacements of the damper unit 7 are relatively small compared to the displacement of the wheel assembly 9.
In the embodiment of Figure 1, the damper unit 7 is positioned such that its axis is disposed somewhere between the axes A1 and A2 depending on the load carried by the vehicle. When the vehicle is unladen, the axis of the damper unit lies on the axis A1, while when the vehicle is loaded, the damper unit pivots about the hinge 6 to the right. The protective member 10 pulls the lever 11 anti-clockwise through the spring 16, the lever 11 pivoting about the axis 12 so that the cam 13 bears on the valve spool 14 and, when the cam engages the spool 14, further movement stresses the spring 16.
In the embodiment of Figure 2, the pivoting of the damper unit 7 at the hinge 6 causes the lever 22 to be rotated which first pivots the lever 11 through the spring 16 until the cam 13 bears on the valve spool 14 and which then stresses the spring 16 to a greater or lesser extent according to the load of the vehicle.
When the brake is operated by the driver, there is produced in the chamber 28 a pressure which exerts a force on the valve spool 14 in a direction opposite to the force exerted by the spring 16. When the force exerted by the braking pressure exceeds the force exerted by the spring 16, the valve spool is displaced in such a way to cause the brake supply duct to close and the lever 11 to pivot about the axis 12 and consequently to increase the tension of the spring 16.
When the driver releases the brakes, the pressure at the inlet 26 is relieved and the valve 31 opens, permitting the pressure in the chamber 28 to fall until the valve spool 14 is displaced to cause the brake supply duct to open under the action of the lever 11 and the spring 29, the spring 16 then relaxing.,
The embodiment in which the lever 22 is connected to the sleeve of the hinge 6 is advantageous in that it avoids distortions of the protective member or sleeve 10 which may be made of plastics or sheet metal.
WHAT WE CLAIM IS:
1. A vehicle having a braking system and a brake pressure limiter for limiting the maximum pressure applicable to the braking system, the limiter having an actuating member which is movable to alter the maximum pressure, a wheel assembly of the vehicle being connected to the body of the vehicle by a damper unit which has a part mounted pivotally on the body and which is arranged in such a way that displacement of the wheel assembly relative to the body causes angular displacement of that part relative to the body, the actuating member of the brake pressure limiter being reiliently connected to that part of the damper unit, whereby the position of the actuating member is a function of the load carried by the vehicle.
2. A vehicle as claimed in claim 1, in which the damper unit is a telescopic damper unit.
3. A vehicle as claimed in claim 2, in which the said part of the damper unit is a protective member.
4. A vehicle as claimed in any one of the preceding claims, in which the actuating member is connected to a lever which is secured to a sleeve of the said part which sleeve affords the pivotal connection between the damper unit and the body.
5. A vehicle as claimed in any one of the preceding claims, in which the actuating member is resiliently connected to the said part by a tension spring.
6. A vehicle as claimed in any one of the preceding claims, in which the actuating member comprises a pivotal lever which comprises a cam surface for engagement with a valve spool of the limiter.
7. A vehicle substantially as described herein with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A vehicle having a braking system and a brake pressure limiter for limiting the maximum pressure applicable to the braking system, the limiter having an actuating member which is movable to alter the maximum pressure, a wheel assembly of the vehicle being connected to the body of the vehicle by a damper unit which has a part mounted pivotally on the body and which is arranged in such a way that displacement of the wheel assembly relative to the body causes angular displacement of that part relative to the body, the actuating member of the brake pressure limiter being reiliently connected to that part of the damper unit, whereby the position of the actuating member is a function of the load carried by the vehicle.
2. A vehicle as claimed in claim 1, in which the damper unit is a telescopic damper unit.
3. A vehicle as claimed in claim 2, in which the said part of the damper unit is a protective member.
4. A vehicle as claimed in any one of the preceding claims, in which the actuating member is connected to a lever which is secured to a sleeve of the said part which sleeve affords the pivotal connection between the damper unit and the body.
5. A vehicle as claimed in any one of the preceding claims, in which the actuating member is resiliently connected to the said part by a tension spring.
6. A vehicle as claimed in any one of the preceding claims, in which the actuating member comprises a pivotal lever which comprises a cam surface for engagement with a valve spool of the limiter.
7. A vehicle substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7711415A FR2387146A1 (en) | 1977-04-15 | 1977-04-15 | BRAKE PRESSURE LIMITER CONTROL ANCHORAGE FOR MOTOR VEHICLES |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1596228A true GB1596228A (en) | 1981-08-19 |
Family
ID=9189465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14859/78A Expired GB1596228A (en) | 1977-04-15 | 1978-04-14 | Vehicle braking system |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2815527C3 (en) |
ES (1) | ES467738A1 (en) |
FR (1) | FR2387146A1 (en) |
GB (1) | GB1596228A (en) |
IT (1) | IT1093944B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2540449B1 (en) * | 1983-02-03 | 1985-06-28 | Prevoteau Raymond | TIMER FOR BRAKE REGULATOR |
FR2611629B2 (en) * | 1986-09-18 | 1989-05-19 | Bendix France | BRAKE CORRECTOR SERVO-LOADED BY A VEHICLE |
DE102014218685A1 (en) * | 2014-09-17 | 2016-03-17 | Continental Teves Ag & Co. Ohg | Displacement transmitter for motor vehicle |
-
1977
- 1977-04-15 FR FR7711415A patent/FR2387146A1/en active Granted
-
1978
- 1978-03-10 ES ES467738A patent/ES467738A1/en not_active Expired
- 1978-03-29 IT IT21735/78A patent/IT1093944B/en active
- 1978-04-11 DE DE2815527A patent/DE2815527C3/en not_active Expired
- 1978-04-14 GB GB14859/78A patent/GB1596228A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2815527B2 (en) | 1980-02-21 |
DE2815527C3 (en) | 1980-10-30 |
FR2387146B1 (en) | 1980-01-18 |
IT1093944B (en) | 1985-07-26 |
DE2815527A1 (en) | 1978-10-26 |
ES467738A1 (en) | 1978-10-16 |
FR2387146A1 (en) | 1978-11-10 |
IT7821735A0 (en) | 1978-03-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |