GB2041125A - Adjusting device for mechanically controlled brake force regulators - Google Patents
Adjusting device for mechanically controlled brake force regulators Download PDFInfo
- Publication number
- GB2041125A GB2041125A GB7943992A GB7943992A GB2041125A GB 2041125 A GB2041125 A GB 2041125A GB 7943992 A GB7943992 A GB 7943992A GB 7943992 A GB7943992 A GB 7943992A GB 2041125 A GB2041125 A GB 2041125A
- Authority
- GB
- United Kingdom
- Prior art keywords
- regulator
- lever
- control
- control lever
- regulator according
- 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.)
- Granted
Links
- 230000001419 dependent effect Effects 0.000 claims abstract description 7
- 239000003550 marker Substances 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process 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
- B60T8/1812—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 means for pressure reduction
- B60T8/1825—Means for changing the diaphragm area submitted to pressure
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Control Valves For Brake Systems (AREA)
- Mechanical Control Devices (AREA)
- Braking Arrangements (AREA)
- Regulating Braking Force (AREA)
Abstract
A load dependent brake force regulator 3 for a pressure-medium- operated brake system of a vehicle includes a control shaft 9 which rotates in dependence on vehicle loading to adjust operation of the regulator. A lever 8 which undergoes angular movement as the vehicle loading changes is connected to one end of the shaft to rotate the latter and, to enable tolerance adjustments to be carried out, the shaft is formed in two parts with a rigid adjustable connection therebetween. <IMAGE>
Description
SPECIFICATION
Adjusting device for mechanically controlled brake force regulators
The invention relates to a load-dependent brake force regulator for a pressure mediumoperated brake system of a vehicle or vehicle trailer.
There are legal regulations for the design of brake systems in commercial vehicles with respect to conditions of compatibility between front and rear axles of vehicles and, in the case of vehicle trains, between traction vehicles and trailer vehicles.
So-called "allocation bands", also known as "lay-out bands", show by graphs the ranges within which operating characteristics of systems must lie for braking front and rear axles of vehicles, or traction and trailer vehicles, in both the empty (unladen) and laden state.
Compliance with these regulations is gener aliy rendered possible by fitting automatic load-dependent brake force regulators, for example of the type disclosed in US-PS 3,645,585, it being necessary in the case of vehicle trains to fit regulators both in the traction vehicle and in the trailer vehicle.
It is more difficult, however, to adhere to the regulations in the case of vehicles having axle loads which differ from one another greatly as a result of special construction and/or special conditions of use. Difficulties can, for example, occur in the case of articulated vehicles the semi-trailers of which must bear the full load on their rear axles while the traction parts of the vehicles are charged only by the support load, or in the case of vehicle trains the traction vehicle which must pull a fully laden trailer vehicle with a low dead weight.
The demands made on brake force regulators become increasingly greater if the regulators are required to accommodate an extensive exchangeability of traction vehicles and trailer vehicles. These demands relate to the characteristic lines of the regulators (a characteristic line being the variation of output pressure of a regulator as a function of the input pressure) and require that characteristic lines must run within the allocation bands even in the case of extreme conditions of use. Such requirements are difficult to fulfil, even when observing narrow production tolerances of injection-moulded structural members of regulators, without expensive additional machining of the members.
The problem with which the present invention is concerned is that of providing a brake force regulator the mechanical control of which is so designed that the characterstic line of the regulator can be brought within the allocation bands without expensive finishing of the structural members of the regulator.
The present invention provides a load-dependent brake force regulator for a pressure medium-operated brake system for a vehicle or trailer, the regulator including a control shaft having: an adjusting part rotational movement of which adjusts operation of the regulator; a lever part connected to a control lever, and means providing a rigid adjustable connection between the two parts, the control lever being connectable for angular movement in dependence on vehicle loading and so connected to the lever part of the shaft that angular movement of the control lever is converted into rotational movement of the said lever part.
By way of example, an embodiment of the invention will now be described in more detail with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal section through a mechanically controlled brake force regulator,
Figure 2 shows a view of this brake force regulator in the direction X of Fig. 1, and
Figure 3 shows a graph of the displacement of the characteristic line of the regulator caused by adjusting the angle of the control lever.
In the regulator shown in Fig. 5, a ram 1 produces a load-dependent regulating connection between a mechanical control part 2 of the regulator and a braking pressure medium control part 3. The lower end 4 of the ram 1 slides on a shaped surface 5 of a control shaft 6 at one end of which is a bore 7 through which passes a control lever 8. The control lever 8 is hinged to a connecting rod (not shown) which produces a connection to a fixed point or a resilient body mounted on a vehicle axle (likewise not shown).
The control shaft 6 is formed in two parts;
(i) a control surface part 9 having the shaped surface 5 and
(ii) a control lever part 11 at the outwardfacing end of the shaft, which part is provided with longitudinal slots 10 and has the bore 7.
The end of the control surface part 9 extends into the inside diameter 1 2 of the control lever part 11 and is clamped thereto, against relative rotation, by a tensioning clamp 1 3 that draws together the slots 10, while a loosening of the tensioning- clamp 1 3 permits a radial turning of the two control shaft parts 9 and 11 with respect to one another. The part 9 of the control shaft is advantageously knurled in the clamping area for better transmission of turning movement from part 11 when clamped thereto.
A cap 15, secured on the end face of the control lever part 11 of the shaft 6 by means of a screw 14, contacts the control lever 8 and, by tightening the screw 14, secures the control lever in the bore 7. The end face contact areas of the cap 1 5 at the control lever 8 are provided with appropriately-shaped radial recesses.
The following functional description of the regulator deals only briefly with the braking pressure medium control part 3 since a detailed description of the latter is not necessary for an understanding of the invention.
The brake force regulator is fixed on the vehicle chassis and is connected to a fixed point of the vehicle axle via the control lever 8 and the above-mentioned connecting rods (not shown) hinged thereto.
If the vehicle is loaded the control lever 8 swings (as indicated by the arrow in Fig. 2) in the direction of the laden position, taking the control shaft 6 with it. As this happens the shaped surface 5 on the shaft raises the ram 1 and opens a valve 1 6 in the pressure medium control part 3, allowing compressed air to flow from an input connection 1 7 of the regulator to an open connection 18 (shown displaced) and then into the brake cylinder.
Tolerance-necessitated corrections to the angular position of the control lever 8 in order to bring the characteristic line of the device into conformity with the allocation bands can then be carried out at the works, after loosening the tensioning clamp 13, by adjusting the control lever 8. This results in the parallel displacement, indicated by the arrow on the graph in Fig. 3, of the actual characteristic line into the desired area, or allocation band.
Advantageously, the tensioning clamp 1 3 is provided with a graduation 1 9 by means of which the angular position of the control lever 8 can be read with the aid of an arrow 20 integrally cast on the regulator housing.
Because it is possible, in the regulator described above, to adjust the angle of the control lever 8 with respect to the control shaft 6 and, as a result, to adjust the loadactuated regulating stroke by means of the control lever, angle errors caused by tolerances can be balanced out, which results in a greater regulating accuracy and thus a smaller tolerance field.
Claims (10)
1. A load-dependent brake force regulator for a pressure medium-operated brake system for a vehicle or trailer, the regulator including a control shaft having: an adjusting part rotational movement of which adjusts operation of the regulator; a lever part connected to a control lever, and means providing a rigid adjustable connection between the two said parts, the control lever being connectable for angular movement in dependence on vehicle loading and so connected to the lever part of the shaft that angular movement of the control lever is converted into rotational movement of the said lever part.
2. A regulator according to claim 1, in which the: lever part of the control shaft is shaped to receive an end of the adjusting part.
3. A regulator according to claim 2, in which the area of the lever part receiving the end of the adjusting part is provided with slots, and a tensioning clamp is arranged in the area of the slots to produce the said rigid connection.
4. A regulator according to claim 2 or claim 3, in which the said end of the adjusting part is knurled.
5. A regulator according to any one of the preceding claims, in which the control lever is located in a bore in the lever part of the control shaft.
6. A regulator according to claim 5 in which the control lever is secured in the bore by a cap which contacts the control lever and is secured at an end face of the lever part of the control shaft by a screw.
7. A regulator according to claim 6, in which surfaces of the cap coming into contact with the control lever are provided with radial recesses.
8. A regulator according to claim 3, including a graduation member and a marker member, one of the members being mounted on the housing and the other member being mounted on the tensioning clamp.
9. A regulator according to any one of the preceding claims, in which the adjusting part of the control shaft includes a shaped surface co-operable with a component of the regulator whereby rotational movement of the adjusting part adjusts operation of the regulator.
10. A load-dependent brake force regulator substantially as described herein with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782855295 DE2855295A1 (en) | 1978-12-21 | 1978-12-21 | ADJUSTING DEVICE FOR MECHANICALLY CONTROLLED BRAKING REGULATORS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2041125A true GB2041125A (en) | 1980-09-03 |
| GB2041125B GB2041125B (en) | 1982-10-13 |
Family
ID=6057904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7943992A Expired GB2041125B (en) | 1978-12-21 | 1979-12-20 | Adjusting device for mechanically controlled brake force regulators |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5587641A (en) |
| DE (1) | DE2855295A1 (en) |
| FR (1) | FR2444597A1 (en) |
| GB (1) | GB2041125B (en) |
| IT (1) | IT1165247B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3041248A1 (en) * | 1980-11-03 | 1982-06-09 | Wabco Fahrzeugbremsen Gmbh, 3000 Hannover | DEVICE FOR ADJUSTING A MECHANICALLY CONTROLLED LOAD-RELATED BRAKE FORCE REGULATOR |
| DE3243654A1 (en) * | 1982-11-25 | 1984-05-30 | Knorr-Bremse GmbH, 8000 München | ADJUSTMENT MECHANISM FOR LOAD-CONTROLLED BRAKE FORCE REGULATORS, ESPECIALLY FOR MOTOR AND TRAILER VEHICLES |
| GB8901252D0 (en) * | 1989-01-20 | 1989-03-15 | Bendix Ltd | Vehicle load-dependent brake force control apparatus |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1492463U (en) * | ||||
| GB776177A (en) * | 1954-09-15 | 1957-06-05 | William Edward O Shei | Improvements in or relating to windscreen wipers |
| DE1430499A1 (en) * | 1962-02-08 | 1969-04-03 | Bosch Gmbh Robert | Brake force regulator for pressure medium brake systems of motor vehicles |
| DE1251168B (en) * | 1962-04-30 | 1967-09-28 | ||
| FR1452641A (en) * | 1965-06-04 | 1966-04-15 | Magneti Marelli Spa | Device for adjusting the braking action, in towed vehicles fitted with a pneumatic braking system |
| US3404922A (en) * | 1967-03-23 | 1968-10-08 | Bendix Westinghouse Automotive | Brake balancing valve with brake tare compensating means |
| ES371510A1 (en) * | 1968-09-16 | 1971-11-01 | Magneti Marelli Spa | Improvements in the construction of automatic regulating devices for braking vehicles in charge function. (Machine-translation by Google Translate, not legally binding) |
| US3645585A (en) * | 1970-02-09 | 1972-02-29 | Bendix Westinghouse Automotive | Brake-balancing valve with brake tape compensating means |
| DE2514484C3 (en) * | 1975-04-03 | 1981-08-20 | Daimler-Benz Ag, 7000 Stuttgart | Load-dependent brake pressure regulator for a vehicle equipped with compressed air brakes |
| JPS5230670A (en) * | 1975-08-28 | 1977-03-08 | Futao Kushiyama | Method to produce a feed from wastes |
| DE2539316C3 (en) * | 1975-09-04 | 1981-02-12 | Daimler-Benz Ag, 7000 Stuttgart | Load-dependent brake force regulator for a motor vehicle brake system |
| GB1523037A (en) * | 1976-04-02 | 1978-08-31 | Dewandre Co Ltd C | Load-sensing valves |
| DE2642078A1 (en) * | 1976-09-18 | 1978-03-23 | Bosch Gmbh Robert | LOAD DEPENDENT BRAKE PRESSURE REGULATOR |
| DE2643296B2 (en) * | 1976-09-25 | 1979-01-11 | Wabco Westinghouse Gmbh, 3000 Hannover | Load-dependent braking force control device |
| FR2365467A1 (en) * | 1976-09-25 | 1978-04-21 | Wabco Westinghouse Gmbh | Trailer braking force regulator - has piston to operate regulator and relay valves connected to second piston which operates relief valve |
| DE2719109C2 (en) * | 1977-04-29 | 1985-06-05 | Robert Bosch Gmbh, 7000 Stuttgart | Load-dependent brake pressure control device |
| DE2809998A1 (en) * | 1978-03-08 | 1979-09-20 | Bosch Gmbh Robert | Load sensitive brake control valve - has knurled input shaft for fine setting w.r.t. load lever to modulate braking effect |
-
1978
- 1978-12-21 DE DE19782855295 patent/DE2855295A1/en active Granted
-
1979
- 1979-11-28 IT IT69300/79A patent/IT1165247B/en active
- 1979-12-12 JP JP16044579A patent/JPS5587641A/en active Granted
- 1979-12-19 FR FR7931160A patent/FR2444597A1/en active Granted
- 1979-12-20 GB GB7943992A patent/GB2041125B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2444597B1 (en) | 1983-04-01 |
| IT1165247B (en) | 1987-04-22 |
| JPH0349779B2 (en) | 1991-07-30 |
| GB2041125B (en) | 1982-10-13 |
| DE2855295C2 (en) | 1992-02-20 |
| FR2444597A1 (en) | 1980-07-18 |
| IT7969300A0 (en) | 1979-11-28 |
| DE2855295A1 (en) | 1980-07-03 |
| JPS5587641A (en) | 1980-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 19991219 |