CN1676965A - Hydraulic brake sub-pump with brake clearance automatic compensating device - Google Patents
Hydraulic brake sub-pump with brake clearance automatic compensating device Download PDFInfo
- Publication number
- CN1676965A CN1676965A CN 200510046316 CN200510046316A CN1676965A CN 1676965 A CN1676965 A CN 1676965A CN 200510046316 CN200510046316 CN 200510046316 CN 200510046316 A CN200510046316 A CN 200510046316A CN 1676965 A CN1676965 A CN 1676965A
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- Prior art keywords
- brake
- bolt
- adjusting
- adjust
- ring
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- Granted
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- 239000000945 filler Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 210000000003 hoof Anatomy 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Braking Arrangements (AREA)
Abstract
The invention discloses a hydraulic brake sub-pump with auto compensation during brake interspaces. It comprises the pump body set with a oil entrance and an oil exit, adjusting piston installed inside the pump, brake shoe linked at the out end of the adjusting piston. Its features are that the inner end of the adjusting piston is linked to one end of adjusting bolt by screw, the other end of the bolt is installed with reflexive thimble jogging on the inner surface of the pump, there is screw track on adjusting bolt and adjusting ring on the track, the ring links with the track by screw, there is a axial-wise clearance set between the teeth of the ring and the track, a pressing spring is installed beside the ring. When brake clearance is larger than the preset value, the invention automatically adjusts as soon as the brake is released. In this way the brake clearance will be maintained always at a preset value ensuring the brake performance and the driving safety. Moreover the invention is of simple structure, handily assembling and low cost.
Description
Technical field
The present invention relates to a kind of drum brake hydraulic braking wheel cylinder, the particularly a kind of drum brake that has brake clearance automatic compensator hydraulic braking wheel cylinder.
Background technique
At present, domestic hydraulic braking wheel cylinder scarcely possesses the brake clearance automatic compensation function, but adopts manual mode that the brake clearance that increases because of friction disc wear is adjusted.The adjustment of manual mode is very inconvenient, and the brake clearance that increases because of friction disc wear always can not be adjusted timely simultaneously, so the braking effect of automobile can not get guaranteeing.Minority hydraulic braking wheel cylinder has the clearance automatic compensation device, but complex structure increases cost of production.In addition, because the dismounting trouble causes deficiencies such as maintenance service difficulty.
Summary of the invention
The purpose of this invention is to provide a kind of hydraulic braking wheel cylinder that has the brake clearance automatic compensator, this brake clearance automatic compensator is installed in hydraulic braking wheel cylinder pressure chamber inside, it can overcome existing shortcoming in the above-mentioned prior art, can realize the brake clearance automatic compensation function reliably, can improve the braking ability and the driving safety of automobile, simultaneously simple in structure, assemble easyly, cost is lower.
The object of the present invention is achieved like this: it comprises the pump housing of hydraulic braking wheel cylinder, have filler opening and oil outlet on the pump housing, and the adjustment piston is installed in the pump housing, the outer end of adjusting piston connects brake shoe, it is characterized in that the end adjusting the inner of piston and adjust bolt passes through scyewed joint, the other end of adjusting bolt is equipped with the elasticity thimble, withstand on the interior edge face of the pump housing, adjust on the bolt and be shaped on the screw thread guide rail, be equipped with on the screw thread guide rail to adjust and encircle, adjust scyewed joint between ring and the screw thread guide rail, be provided with the axial tooth side clearance between the screw thread guide rail of the tooth of adjustment ring and adjustment bolt, stage clip is equipped with in the side of adjusting ring, adjusts on the bolt and is shaped on oil duct.
When friction plate does not does not wear and tear, owing to adjust between tooth that encircles and the screw thread guide rail of adjusting bolt the axial tooth side clearance is arranged, so the adjustment bolt is adjusted ring relatively a free travel S1 is being arranged axially, S1 also is the brake clearance between friction plate and the brake drum.During braking, adjust ring and maintain static, when adjusting bolt and adjusting piston outwards displacement distance reaches S1 under the effect of hydraulic oil, friction plate and brake drum are close to, and realize the purpose of braking.After the brake off, adjust bolt and return to original position, do not have axial displacement between them with the adjustment piston.
When the effect owing to braking force caused friction disc wear, the gap between friction plate and brake drum surface of contact will increase, and was δ as the wear extent along brake cylinder axial direction friction plate, and the gap between them is S1+ δ.During braking, under the promotion of hydraulic coupling, adjusting bolt is S1+ δ along with adjusting the outwards mobile axial distance of piston.Adjust the suffered frictional force that limits its rotation of bolt this moment greater than adjusting the suffered frictional force that limits its rotation of ring, under the drive of adjusting the bolt thread guide rail, circumferentially rotate, only axially outwards move and do not rotate and adjust bolt so adjust ring.Promptly outside when mobile when adjusting piston, adjust bolt and to adjust the piston retainer shaft constant to relative distance.
When brake off, hydraulic coupling disappears, under the tension of brake shoe return spring, adjust bolt along with the axial distance that the adjustment piston moves inward is S1+ δ, this moment is owing to adjust the suffered frictional force that limits its rotation of ring much larger than adjusting the suffered frictional force that limits its rotation of bolt, do not rotate so at this moment adjust ring, circumferentially rotate and adjust bolt.Because being subjected to the restriction of brake shoe, the adjustment piston can not together rotate with adjusting bolt, so when the adjustment piston moves inward, adjust bolt and screw out the adjustment piston, the axial displacement of adjusting piston and adjusting between the bolt is δ, the corresponding outside mobile δ distance of brake shoe feasible and the adjustment piston is connected, in order to friction compensation pad wear amount, thereby make friction plate and the brake clearance between brake drum of adjusting piston end keep constant S1.
Advantage of the present invention is: when brake clearance during greater than predetermined value, the present invention promptly can realize adjusting automatically in brake off, so the present invention can make brake clearance remain on a predetermined constant constantly, the braking ability and the driving safety of automobile are guaranteed, the present invention simultaneously is simple in structure, assemble easyly, cost is lower.
Description of drawings
Fig. 1 is first a kind of embodiment's of the present invention structural representation.
Fig. 2 is second a kind of embodiment's of the present invention structural representation.
Fig. 3 is the structural representation of brake clearance automatic compensator of the present invention.
Embodiment
The present invention will be further described in detail with reference to the accompanying drawings.
With reference to Fig. 1 and Fig. 3, the 9th, the pump housing of hydraulic braking wheel cylinder, the pump housing is fixed on the braking bottom board of automobile by bolt assembly.On the pump housing, have filler opening 16 and oil outlet 17.The two ends of the pump housing are equipped with piston, as seen from the figure, left end is a supporting piston 1, right-hand member is equipped with adjusts piston 14, between supporting piston and the adjustment piston and the pump housing 9 y-type seal ring 8 is housed respectively, the outer end of supporting piston is connected with following brake shoe 19, and the outer end of adjusting piston is connected with brake shoe 18.
The brake clearance automatic compensator is installed in the pump housing 9, its structure as shown in Figure 3, bolt 7 is adjusted in the inner at adjustment piston 14 by being threaded, in the inner chamber of the adjustment bolt the other end elasticity thimble that is made of stage clip 4 and thimble 3 is housed, on the interior edge face of the supporting piston on the left of withstanding on, make stage clip 4 be in compressive state all the time.Thimble 3 is installed in the stage clip 4 of reducing, can be in stage clip axial float, but can not come off; Be provided with the screw thread guide rail of making by multiple thread 23 adjusting on the bolt 7, adjust ring 6 and be installed in and adjust on the bolt, be meshed, and be provided with axial tooth side clearance S1 between the screw thread guide rail of the tooth of adjusting ring and adjustment bolt with the screw thread guide rail.Also be set with on the adjustment bolt and adjust ring stage clip 15, adjust in the groove of an end clip on the adjustment bolt that encircles stage clip, the other end withstands on to be adjusted on the ring, makes to adjust to encircle on the end face that is close to all the time in the pump housing, can not axial float.Because the spring force of stage clip 4 is much larger than the spring force of adjusting ring stage clip 15, so under the spring force effect of stage clip 4, no matter when braking still during brake off, adjusted bolt outer end flank of thread and lean together with adjusting the piston thread face all the time, make and adjust bolt all the time along with the adjustment piston moves; Between the rear portion of adjustment bolt 7 and the pump housing O type rubber ring 5 is installed, contacts with forming a certain amount of extruding between the pump housing, the frictional force that it produced is adjusted the circumferential rotation of bolt in order to restriction.
10 is the existing manual adjustment handles that still keep among the figure, is fastened in to adjust on the piston 14.Rotation adjustment handle 10 can drive adjustment piston 14 and rotate together; Connection hoof pin 12 and adjustment piston 14 cottered joints; Elasticity connects jump ring 11 1 ends and is fastened on the adjustment piston 14, and the other end is fastened on the connection hoof pin 12, and its effect is both to have guaranteed to adjust handle 10 and joined the hoof pin to be unlikely to come off easily, allows adjustment piston phase distich hoof pin to rotate again.The two ends of the pump housing all are equipped with stuffing box gland 2 and 13, and their difference cuffs are on supporting piston, adjustment piston and the pump housing; Filler opening leads to adjusts the piston end pressure lumen; Oil outlet is communicated with the supported end pressure lumen; Adjust the oil duct of processing on the bolt 24, its effect is to guarantee that all pressure chambers all are connected in the brake cylinder, makes the hydraulic coupling in all pressure chambers identical, can not form vacuum, thereby guarantees the proper functioning of regulating mechanism.
As seen from Figure 2, second kind of embodiment's of the present invention structure is: the pump housing 9 has only an end that the adjustment piston is installed, and the other end is a closed end.The outer end of adjusting piston is connected with brake shoe, and the inner of adjustment piston and the adjustment bolt of brake clearance automatic regulating apparatus are by being threaded, and the elasticity thimble of brake clearance automatic regulating apparatus withstands on the interior edge face of the pump housing 9 closed ends.
20 is friction plates among the figure, the 21st, and brake drum.
Claims (3)
1, the hydraulic braking wheel cylinder that has the brake clearance automatic compensator, it comprises the pump housing of hydraulic braking wheel cylinder, have filler opening and oil outlet on the pump housing, and the adjustment piston is installed in the pump housing, the outer end of adjusting piston connects brake shoe, it is characterized in that the end adjusting the inner of piston and adjust bolt passes through scyewed joint, the other end of adjusting bolt is equipped with the elasticity thimble, withstand on the interior edge face of the pump housing, adjust on the bolt and be shaped on the screw thread guide rail, be equipped with on the screw thread guide rail and adjust ring, adjust scyewed joint between ring and the screw thread guide rail, adjust between tooth that encircles and the screw thread guide rail of adjusting bolt and be provided with the axial tooth side clearance, stage clip is equipped with in the side of adjusting ring, adjusts on the bolt and is shaped on oil duct.
2, according to the said brake cylinder of claim 1, it is characterized in that the end in the pump housing is equipped with the adjustment piston, the other end is equipped with support piston, the outer end of support piston and adjustment piston is respectively with last, following brake shoe is connected, the inner of adjusting piston links by a screw thread and an end of adjusting bolt, the other end of adjusting bolt withstands on the interior edge face of support piston by the elasticity thimble, adjust on the bolt and be shaped on the screw thread guide rail, be equipped with on the screw thread guide rail and adjust ring, adjust scyewed joint between ring and the screw thread guide rail, adjust between tooth that encircles and the screw thread guide rail of adjusting bolt and be provided with the axial tooth side clearance, stage clip is equipped with in the side of adjusting ring, adjusts on the bolt and is shaped on oil duct.
3,, it is characterized in that between the rear end of adjusting bolt and the pump housing, rubber ring being installed according to claim 1 or 2 said brake cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100463165A CN100362256C (en) | 2005-04-27 | 2005-04-27 | Hydraulic brake sub-pump with brake clearance automatic compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100463165A CN100362256C (en) | 2005-04-27 | 2005-04-27 | Hydraulic brake sub-pump with brake clearance automatic compensating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1676965A true CN1676965A (en) | 2005-10-05 |
| CN100362256C CN100362256C (en) | 2008-01-16 |
Family
ID=35049643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100463165A Expired - Fee Related CN100362256C (en) | 2005-04-27 | 2005-04-27 | Hydraulic brake sub-pump with brake clearance automatic compensating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100362256C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116428290A (en) * | 2023-05-30 | 2023-07-14 | 中车制动系统有限公司 | An Active Hydraulic Brake Cylinder with Gap Adjustment Function |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB981165A (en) * | 1960-06-25 | 1965-01-20 | Dunlop Rubber Co | Disc brake comprising wear-compensating mechanism |
| CN85101200B (en) * | 1985-04-01 | 1987-03-04 | 日信工业株式会社 | Brake gap automatic compensation device for hydraulic brake |
| SE0004715D0 (en) * | 2000-12-20 | 2000-12-20 | Haldex Brake Prod Ab | A transmission brake |
| CN2425829Y (en) * | 2000-05-26 | 2001-04-04 | 张柏青 | Hydraulic brake cylinder for car |
-
2005
- 2005-04-27 CN CNB2005100463165A patent/CN100362256C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116428290A (en) * | 2023-05-30 | 2023-07-14 | 中车制动系统有限公司 | An Active Hydraulic Brake Cylinder with Gap Adjustment Function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100362256C (en) | 2008-01-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080116 Termination date: 20210427 |
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| CF01 | Termination of patent right due to non-payment of annual fee |