GB2085989A - Brake booster - Google Patents
Brake booster Download PDFInfo
- Publication number
- GB2085989A GB2085989A GB8129474A GB8129474A GB2085989A GB 2085989 A GB2085989 A GB 2085989A GB 8129474 A GB8129474 A GB 8129474A GB 8129474 A GB8129474 A GB 8129474A GB 2085989 A GB2085989 A GB 2085989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reinforcement member
- housing
- master cylinder
- booster
- brake
- 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
- 230000002787 reinforcement Effects 0.000 claims abstract description 30
- 238000003466 welding Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
-
- 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
- B60T13/24—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 gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
- B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The wall 1a of a brake booster housing 1 is provided with a reinforcement member 3 which is adhesively attached to the wall between each two adjacent bolts 8 by which the booster is connectable to a brake master cylinder body Ma. The reinforcement member may further be spot welded to the wall. <IMAGE>
Description
SPECIFICATION
Booster mountings
The invention relates to a vehicle brake system having a power multiplying booster device, and more particularly to a reinforcement structure for booster housings in such brake system.
In a vehicle brake system having a power multiplying booster device, the booster device generally has a booster housing which is'adapted to be mounted on a master cylinder body. In the booster housing, there is provided a diaphragm or a piston which define a vacuum or suction pressure chamber at the side adjacent to the master cylinder body and an atmospheric pressure chamber at the other side. The diaphragm or piston is displaced under the pressure difference between the suction pressure chamber and the atmospheric pressure chamber toward the brake master cylinder, and functions to force the master piston in the master cylinder. The booster housing is thus subjected to a suction pressure at the side adjacent to the master cylinder.Further, the booster housing is also subjected to a load which is applied from the brake pedal so that a significant level of stress is produced in the booster housing in the area where the booster housing is attached to the master cylinder.
Conventionaliy, the booster housing has been provided, at the inner surface of the wall which is attached to the master cylinder body, with a reinforcement plate so that the housing is given sufficient strength without using a thicker material. The reinforcement plate is spot welded to the booster housing wall which is attached together with the reinforcement plate to the master cylinder body by bolts. In conventional booster housing structures, three bolts are used for this purpose at circumferentially equi-distant positions and the spot weldings are made between each two adjacent bolts. In this conventional structure, however, problems have been experienced in that stress concentrations are produced in the vicinity of the bolts and result in fatigue failure through prolonged use of the device.Further, in carrying out spot welding in accordance with a conventional technique, it is required to clean the work by acid prior to the spot-welding process. Although a surface treatment is made after the spot welding, there may be residual acid on the work, possibly causing corrosion of the material.
The invention provides a brake force multiplying booster device for mounting on a brake master cylinder body, the device having a housing including an attachment wall the outer surface of which is to abut the brake master cylinder body and the inner surface of which is provided with a reinforcement member, and a plurality of bolts for connecting the attachment wall and the reinforcement member to the master cylinder body, the reinforcement member being adhesively bonded to the attachment wall.
The reinforcement member may further be spot-welded to said attachment wall of the housing.
According to the features of the present invention, since the reinforcement member is adhesively attached to the attachment wall of the housing preferably throughout the area of the member, it is possible to avoid stress concentrations in the vicinity of the bolts. The serviceable life of the booster housing can be increased without increasing the thickness of the housing material. The reinforcement structure in accordance with the invention does not require in principle the spot welding between the booster housing and the reinforcement member so that the problems of corrosion in inherent in spot welding can be substantially eliminated.
The invention is illustrated by the drawings, of which:
Figure 1 is a fragmentary sectional view of a brake booster housing according to the invention; and
Figure 2 is a chart showing an advantageous result obtained by the present invention.
With reference to Figure 1 of the drawings, a brake master cylinder M of a conventional construction has a booster attaching flange Ma. A brake force multiplying booster B includes a housing 1 having an annular wall 1 a, the outer surface of which is attached to the flange Ma. A booster stem 2 extends coaxially with the annular wall 1 a. An annular reinforcement member 3 is attached to the inner surface of the annular wall 1 a. A diaphragm 5 divides the booster housing 1 into a suction pressure chamber 4 and an atmospheric chamber 6. A spring 7 acts between the reinforcement member 3 and the diaphragm 5. The booster housing 1 is installed on the flange
Ma of the brake master cylinder M by three bolts 8. As shown diagrammatically in Figure 2, the bolts 8 are located at 1200 angular intervals.
Further, the bolts 8 have heads 8a secured to the reinforcement member 3 such as by welding and are inserted through the reinforcement member 3 and the annular wall 1 a of the housing 1 to project from the housing 1. The bolts 8 are inserted through the bolt holes in the flange Ma and engaged with nuts Z.
As shown in Figure 1, the reinforcement member 3 is attached to the wall 1 a of the booster housing 1 by an adhesive 9 substantially throughout the area thereof. An epoxy type adhesive may advantageously be used for the purpose. Further, the reinforcement member 3 may additionally be spot-welded to the attachment wall 1 a by spot welding as shown by reference characters D in Figure 2.
Referring now to Figure 2, there are shown advantageous results as obtained by the invention.
The chart in Figure 2 shows test results in respect of displacement under load of the housing material in the vicinity of the bolts 8 and the peak stress in the housing material. In the specimens subjected to test the housing 1 was 1.0 mm thick and the reinforcement member 3 was 1.4 mm thick. In the specimen A, the reinforcement member 3 was simply fastened to the housing by the three bolts 8. In the specimen B, the reinforcement member 3 was spot weided to the housing 1 at six positions as shown by the reference D in Figure 2 and in addition fastened by the three bolts 8. In the speciment C, the reinforcement member 3 was adhesively attached to the housing 1 substantially throughout the area thereof in accordance with the present invention.
The specimens were subjected to a load of 450 kg and measurements were made on the displacement of the housing material in the vicinity of the bolts 8 and the peak stress in the housing material. It will be noted in Figure 2 that the reinforcement structure in accordance with the present invention is effective to significantly decrease the stress level in the booster housing.
Claims (4)
1. A brake force multiplying booster device for mounting on a brake master cylinder body, the device having a housing including an attachment wall the outer surface of which is to abut the brake master cylinder body and the inner surface of which is provided with a reinforcement member, and a plurality of bolts for connecting the attachment wall and the reinforcement member to the master cylinder body, the reinforcement member being adhesively bonded to the attachment wall.
2. A brake force multiplying booster device according to claim 1 in which the reinforcement member is further bonded to the attachment wall by spot welding.
3. A brake force multiplying booster device according to claim 1 or claim 2 in which the reinforcement member is adhesively bonded to the attachment wall over substantially the whole area of the reinforcement member.
4. A brake force multiplying booster device for mounting on a brake master cylinder body, the device being substantially as described herein with reference to Figure 1 of the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55137986A JPS5766062A (en) | 1980-10-01 | 1980-10-01 | Attaching method for reinforcing plate of brake booster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2085989A true GB2085989A (en) | 1982-05-06 |
| GB2085989B GB2085989B (en) | 1984-08-15 |
Family
ID=15211379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8129474A Expired GB2085989B (en) | 1980-10-01 | 1981-09-30 | Brake booster |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5766062A (en) |
| DE (1) | DE3139159C2 (en) |
| GB (1) | GB2085989B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2181200A (en) * | 1985-09-30 | 1987-04-15 | Jidosha Kiki Co | Brake booster |
| WO2007096391A1 (en) * | 2006-02-27 | 2007-08-30 | Robert Bosch Gmbh | Power-assist brake system equipped with adhesive joint and method for mounting same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2499924A1 (en) * | 1981-02-19 | 1982-08-20 | Dba | METHOD FOR CONFORMING A SERVOMOTOR MEMBER WITH ITS REINFORCEMENT |
| JPH01144164U (en) * | 1988-03-14 | 1989-10-03 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1406357A (en) * | 1964-09-02 | 1965-07-16 | Robertbosch G M B H | Fluid pressure brake booster for hydraulic braking devices |
| ZA794398B (en) * | 1978-09-01 | 1980-08-27 | Lucas Industries Ltd | Servo boosters for vehicle braking systems |
-
1980
- 1980-10-01 JP JP55137986A patent/JPS5766062A/en active Pending
-
1981
- 1981-09-30 GB GB8129474A patent/GB2085989B/en not_active Expired
- 1981-10-01 DE DE19813139159 patent/DE3139159C2/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2181200A (en) * | 1985-09-30 | 1987-04-15 | Jidosha Kiki Co | Brake booster |
| WO2007096391A1 (en) * | 2006-02-27 | 2007-08-30 | Robert Bosch Gmbh | Power-assist brake system equipped with adhesive joint and method for mounting same |
| FR2897820A1 (en) * | 2006-02-27 | 2007-08-31 | Bosch Gmbh Robert | Power-assist brake system equipped with an adhesive joint to fix in an engine compartment against a firewall and to screw down next to passenger compartment of a vehicle having an adhesive joint, comprises a protective film having tab |
| CN101395390B (en) * | 2006-02-27 | 2011-04-13 | 罗伯特博世有限公司 | Power-assist brake system and method for mounting same |
| US8262171B2 (en) | 2006-02-27 | 2012-09-11 | Robert Bosch Gmbh | Power-assist brake system equipped with adhesive joint and method for mounting same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5766062A (en) | 1982-04-22 |
| DE3139159A1 (en) | 1982-04-15 |
| DE3139159C2 (en) | 1987-04-16 |
| GB2085989B (en) | 1984-08-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950930 |