CN101412398B - Hydraulic drum brake with upper and lower double pushrods parking mechanism - Google Patents
Hydraulic drum brake with upper and lower double pushrods parking mechanism Download PDFInfo
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- CN101412398B CN101412398B CN2008102290018A CN200810229001A CN101412398B CN 101412398 B CN101412398 B CN 101412398B CN 2008102290018 A CN2008102290018 A CN 2008102290018A CN 200810229001 A CN200810229001 A CN 200810229001A CN 101412398 B CN101412398 B CN 101412398B
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- brake
- rod
- push
- parking
- brake shoe
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Abstract
The invention provides a hydraulic drum type brake for a parking mechanism with upper and lower push rods. The hydraulic drum type brake solves the problem that the prior drum type brake is insufficient in brake friction force fundamentally, which comprises a brake base plate, a brake cylinder, an automatically adjusting device for brake clearances, a front brake shoe and a rear brake shoe. The technical points of the brake comprise that the push rods comprise a combined upper push rod and a lower push rod, the upper end of a parking draw arm is hinged together with the upper end of a supporting arm at the upper end of the rear brake shoe, and the middle part of the supporting arm is hinged with the rear brake shoe through a pin roll, a fork horn of the upper front push rod is tensioned on the front brake shoe, and a fork horn of the upper rear push rod is tensioned on the parking draw arm and the rear brake shoe; and the front end of the lower push rod is hinged on the front brake shoe, while the rear end is tensioned in an arc-shaped groove at the lower end of the supporting arm. The structural design is reasonable, the brake shoe is contacted fully with the brake surface of the brake drum to increase the brake friction force, so that the automobile needs no auxiliary parking brake when stopping at a ramp way, and the parking is safe and convenient, thereby not only improving the braking reliability of the parking mechanism, but also prolonging the service life of the brake.
Description
Technical field
The present invention relates to a kind of automobile hydraulic drum brake mechanism, particularly a kind of hydraulic drum brake that has upper and lower double pushrods parking mechanism.It is applicable to the braking during standstill of all kinds of automobiles.
Background technology
At present, the domestic automobile field is the halting mechanism of widespread use hydraulic drum brake still, the main flow of its drum brake mechanism adopts the internal expanding type structure, it mainly by by be bolted to back-plate on the sedan-chair shell, by be bolted to brake wheel on the rim for automobile wheel, be assembled in brake cylinder, the brake clearance self-reacting device on the back-plate, the pass through shoe spring and push rod and two parts such as brake shoe brake cheek of back-plate bonded assembly that is assembled in the brake wheel formed.Existing halting mechanism adopts two symmetrically arranged brake shoe brake cheek of single push rod promotion to carry out braking during standstill mostly, the brake shoe brake cheek brake surface partly is stretched on the brake wheel brake surface, the brake shoe brake cheek brake surface utilizes insufficient, and be subjected to structural limitations, under the situation that the push rod propelling thrust can't increase, cause the drag friction power deficiency between brake shoe brake cheek and brake wheel; Especially when stop in the ramp, appearance of vehicle easily slides downwards, and the need driver steps on foot brake or engage a gear is assisted braking during standstill, and is very inconvenient.The hydraulic drum brake that also has has increased braking during standstill clearance automatic compensation device, as patent publication No. be CN1058775C " drum brake mechanism assembly ", have structure with servo brake pattern or braking during standstill mode manipulation drg, hydraulic drum brake is with the push rod of brake cylinder body as braking during standstill; " drum brake mechanism of self-regulated during Parking " of CN1528626A, that is adopted allots plate one end hook portion hook certainly in the Parking torque arm, the ratchet engaged of other end gib head and self-reacting device assembly, can realize the automatic compensation in gap during Parking, attempt to reach with this and can avoid brake clearance to increase gradually, can reduce again from the purpose of alloting the invalid action that repeats to adjust of plate with friction disc wear.Disclose the automatic striking gear that ratchet is stirred in a kind of setting at patent announcement number in for CN201100344Y " a kind of drum brake mechanism ", be similarly the brake clearance adjustment that realizes drg, improved the safety performance and the deceleration and stopping performance of drum brake mechanism.Yet because the raising of drum brake mechanism deceleration and stopping performance depends primarily on the drag friction power between brake surface and brake wheel on the brake shoe brake cheek, the braking during standstill clearance automatic compensation device that adopts in the above-mentioned patent is just when brake shoe lining weares and teares, keeping the reliability and the service life of braking during standstill, fundamentally do not solve the braking during standstill hypodynamic hard nut to crack that rubs.So the halting mechanism of existing hydraulic drum brake is demanded urgently improving.
Summary of the invention
The purpose of this invention is to provide a kind of hydraulic drum brake that has upper and lower double pushrods parking mechanism, the brake shoe brake cheek brake surface that it fundamentally solves existing drum brake mechanism utilizes insufficient, the hypodynamic problem of drag friction between brake shoe brake cheek and brake wheel, its reasonable in design, brake shoe brake cheek brake surface and brake wheel brake surface full contact, compared with similar products, under the identical situation of push rod thrust, increased the drag friction power between brake shoe brake cheek and brake wheel, car ramp stops need not assist braking during standstill, parking safety, convenient, both improve the braking reliability of halting mechanism, prolonged the service life of drg again.
Technical scheme of the present invention is: this hydraulic drum brake that has upper and lower double pushrods parking mechanism comprises the back-plate that is fixed on the sedan-chair shell, be assembled in brake cylinder and brake clearance self-reacting device on the back-plate, by extension spring and push rod be connected on the back-plate before, back brake shoe brake cheek, its technical essential is: described push rod comprises by adjusting ratchet bonded assembly upper push-rod and the lower push-rod that push rod and last rear push-rod be combined into of going forward, two sides at described back brake shoe brake cheek are provided with Parking torque arm and support arm respectively, and it is by bearing pin that the upper end of the upper end of described Parking torque arm and described support arm is hinged in brake shoe brake cheek upper end, back, the middle part of described support arm utilizes bearing pin hinged with the back brake shoe brake cheek, by the upper push-rod extension spring, described prong of going forward the push rod front end is stretched on the fore brake, the described rear push-rod rear end prong of going up is stretched on described Parking torque arm and the described back brake shoe brake cheek; Described lower push-rod front end is hinged on the described fore brake by bearing pin, and rod rear end is stretched in the arc groove of described support arm lower end by the lower push-rod extension spring.
The end that described upper push-rod is adjusted ratchet is threaded with the described rear push-rod of going up, and the other end is slidingly connected in the endoporus of the described push rod of going forward.
Positive technique effect and advantage that the present invention produced are: carry out braking during standstill because the hydraulic drum brake of halting mechanism of the present invention adopts upper and lower pair of push rod to promote forward and backward brake shoe brake cheek, be used for substituting the halting mechanism that single push rod that prior art adopts promotes, utilize the hypodynamic defective of drag friction between insufficient, brake shoe brake cheek and brake wheel so can overcome the brake shoe brake cheek brake surface of its existence.The reasonable in design of this hydraulic drum brake, utilization is hinged on the Parking torque arm and the ingenious of support arm of brake shoe brake cheek two sides, back and moves, promote combination upper push-rod and lower push-rod while, synchronization action respectively, the brake shoe brake cheek brake surface is fully contacted with the brake wheel brake surface, compare with existing hydraulic drum brake, under the identical situation of its push rod propelling thrust, greatly increased the drag friction power between brake shoe brake cheek and the brake wheel, need not foot brake or engage a gear and assist braking during standstill can realize the ramp parking of automobile, and the safety of stopping, convenient.Therefore, the present invention can fundamentally solve the braking during standstill hypodynamic hard nut to crack that rubs, thereby further guarantees the braking reliability of halting mechanism, has also prolonged the service life of hydraulic drum brake.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is a kind of concrete structure scheme drawing of the present invention.
Fig. 2 is a kind of concrete structure scheme drawing of the hydraulic drum brake of existing single pushrods parking mechanism.
Fig. 3 be among Fig. 1 H to axle side scheme drawing.
Fig. 4 is along the cutaway view of A-A line among Fig. 1.
Fig. 5 is along the cutaway view of B-B line among Fig. 1.
Fig. 6 is along the cutaway view of D-D line among Fig. 1.
Fig. 7 is along the cutaway view of E-E line among Fig. 1.
Fig. 8 is a kind of structural representation of assembly type upper push-rod of the present invention.
Fig. 9 is along the cutaway view of C-C line among Fig. 1.
Figure 10 is a kind of fundamental diagram of halting mechanism of the present invention.
Sequence number explanation among the figure:
1 lower push-rod extension spring, 2 Parking backguy carriages, 3 rivets, 4 brake shoe brake cheek tension springs, 5 brake shoe brake cheek bearings, 6 brake shoe brake cheek pressing plates, 7 bearing pins, 8 lower push-rods, 9 back-plates, 10 Parking backguys, 11 self-regulated arm extension springs, 12 bearing pins, 13 fore brakes, 14 self-regulated arms, 15 upper push-rod extension springs, 16 brake cylinders, 17 bearing pins, 18 support arms, 19 back brake shoe brake cheek, 20 bearing pins, 21 Parking torque arm, 22 glands, 23 compression spring of brake shoe, 24 brake shoe brake cheek position-limited levers, 25 push rods of going forward, 26 adjust ratchet, rear push-rod on 27,28 brake wheels.
The specific embodiment
Couple the present invention is described in detail according to Fig. 1-10.This hydraulic drum brake that has upper and lower double pushrods parking mechanism comprises and is fixed on the back-plate 9 of sedan-chair shell on (not shown), be assembled on the back-plate 9 brake cylinder 16 commonly used and by self-regulated arm extension spring 11, utilize bearing pin 12 to be hinged on the brake clearance self-reacting device that self-regulated arm 14 on the fore brake 13 etc. is formed, be connected fore brake 13 on the back-plate 9, back parts such as brake shoe brake cheek by extension spring and two push rods.Wherein brake cylinder 16 is by being bolted on the back-plate 9; Self-regulated arm 14 is bound up on the back-plate 9 by bearing pin 12.
Two push rods comprise by adjusting ratchet 26 bonded assemblys upper push-rod and the lower push-rod 8 that push rod 25 and last rear push-rod 27 be combined into of going forward.For an end that makes the adjustment ratchet 26 that makes up upper push-rod is threaded with last rear push-rod 27, the other end is slidingly connected in the endoporus of the push rod 25 of going forward, and can slide in the push rod 25 of going forward, so that adjust the distance at combination upper push-rod two ends according to actual needs.In order to ensure making up upper push-rod and 8 energy whiles of lower push-rod, synchronization action, Parking torque arm 21 and support arm 18 are set respectively in the two sides of back brake shoe brake cheek 19.Wherein the shape of support arm 18 as shown in Figure 1, the upper end of the upper end of support arm 18 and Parking torque arm 21 is hinged in the upper end of back brake shoe brake cheek 19 by bearing pin 17.The middle part of support arm 18 utilizes bearing pin 20 hinged with back brake shoe brake cheek 19, and by upper push-rod extension spring 15, and the prong of push rod 25 front ends of going forward is stretched on the fore brake 13, will go up rear push-rod 27 rear end prongs and be stretched on Parking torque arm 21 and the back brake shoe brake cheek 19.Lower push-rod 8 front ends are hinged on the fore brake 13 by bearing pin 7, and lower push-rod 8 rear ends are stretched in the arc groove of support arm 18 lower ends by lower push-rod extension spring 1.Said modules has formed a kind of hydraulic drum brake with upper and lower double pushrods parking mechanism.
Narrate the working process of braking during standstill of the present invention below by Figure 10: with Parking backguy 10 pulling Parking torque arm 21, Parking torque arm 21 promotes the upper push-rod level to moving by fulcrum K, rotate around fulcrum K simultaneously, and pass through bearing pin 17 drive support arms 18 and rotate around bearing pin 20, thereby make support arm 18 promote lower push-rod 8 levels to moving, finally: the push rod 25 of going forward promotes fore brake 13 tops, its horizontal thrust is F1, lower push-rod 8 promotes fore brake 13 bottoms by bearing pin 7, its horizontal thrust is F2, and fore brake 13 is pressed against on the brake wheel brake surface more equably; The antagonistic force of F1 and F2 is by support arm 18 and bearing pin 20 simultaneously, promote back brake shoe brake cheek 19, its horizontal thrust is F3, back brake shoe brake cheek 19 is pressed against on the brake wheel brake surface more equably, thereby realize that upper and lower double pushrods promotes the front and back brake shoe brake cheek is pressed against on the brake wheel brake surface simultaneously, make brake shoe brake cheek and brake wheel brake surface full contact.
As required, the assembly in the above-mentioned hydraulic drum brake also can symmetric arrangement be installed.
Claims (2)
1. hydraulic drum brake that has upper and lower double pushrods parking mechanism, comprise the back-plate that is fixed on the sedan-chair shell, be assembled in brake cylinder and brake clearance self-reacting device on the back-plate, by extension spring and push rod be connected on the back-plate before, back brake shoe brake cheek, it is characterized in that: described push rod comprises by adjusting ratchet bonded assembly upper push-rod and the lower push-rod that push rod and last rear push-rod be combined into of going forward, both sides at described back brake shoe brake cheek are provided with Parking torque arm and support arm respectively, and it is by bearing pin that the upper end of the upper end of described Parking torque arm and described support arm is hinged in brake shoe brake cheek upper end, back, the middle part of described support arm utilizes bearing pin hinged with the back brake shoe brake cheek, by the upper push-rod extension spring, described prong of going forward the push rod front end is stretched on the fore brake, the described rear push-rod rear end prong of going up is stretched on described Parking torque arm and the described back brake shoe brake cheek; Described lower push-rod front end is hinged on the described fore brake by bearing pin, and the lower push-rod rear end is stretched in the arc groove of described support arm lower end by the lower push-rod extension spring.
2. the hydraulic drum brake that has upper and lower double pushrods parking mechanism according to claim 1 is characterized in that: the end that described upper push-rod is adjusted ratchet is threaded with the described rear push-rod of going up, and the other end is slidingly connected in the endoporus of the described push rod of going forward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102290018A CN101412398B (en) | 2008-11-25 | 2008-11-25 | Hydraulic drum brake with upper and lower double pushrods parking mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102290018A CN101412398B (en) | 2008-11-25 | 2008-11-25 | Hydraulic drum brake with upper and lower double pushrods parking mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101412398A CN101412398A (en) | 2009-04-22 |
| CN101412398B true CN101412398B (en) | 2010-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102290018A Expired - Fee Related CN101412398B (en) | 2008-11-25 | 2008-11-25 | Hydraulic drum brake with upper and lower double pushrods parking mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101412398B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312944A (en) * | 2010-06-29 | 2012-01-11 | 比亚迪股份有限公司 | Drum brake |
| CN102086916A (en) * | 2011-01-10 | 2011-06-08 | 山东遨游汽车制动***股份有限公司 | Brake clearance self-regulating device |
| CN102734355B (en) * | 2011-03-31 | 2017-04-12 | 株式会社爱德克斯 | Electric parking brake device |
| CN103381824B (en) * | 2012-05-04 | 2017-09-19 | 福特环球技术公司 | For the method and system for the vehicle for keeping stopping on ramp |
| CN103899690A (en) * | 2014-04-22 | 2014-07-02 | 重庆市璧山宏向汽配有限公司 | Pull-arm-type brake with gap self-adjusting function |
| CN103899685A (en) * | 2014-04-22 | 2014-07-02 | 重庆市璧山宏向汽配有限公司 | Self-gap-adjusting assembly of draw-arm-type brake |
| CN103899692A (en) * | 2014-04-22 | 2014-07-02 | 重庆市璧山宏向汽配有限公司 | Special gap self-regulating assembly for arm-pulling type brake |
| CN103899686A (en) * | 2014-04-22 | 2014-07-02 | 重庆市璧山宏向汽配有限公司 | Arm-pulling type gap self-regulating brake |
| CN103899687A (en) * | 2014-04-22 | 2014-07-02 | 重庆市璧山宏向汽配有限公司 | Dragging arm type brake with interval self-adjustment function |
| CN107314062B (en) * | 2017-08-08 | 2019-05-21 | 安徽江淮汽车集团股份有限公司 | Self energizing effort drum brake |
| CN108869584B (en) * | 2018-07-17 | 2020-08-25 | 广东中博汽车零部件有限公司 | Take armtie pivot of limit function of riveting soon |
| CN109318872A (en) * | 2018-12-07 | 2019-02-12 | 南京交通职业技术学院 | A kind of drum type parking brake detecting uphill starting signal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB541617A (en) * | 1940-12-02 | 1941-12-03 | Automotive Prod Co Ltd | Improvements in or relating to internal shoe drum brakes |
| US4236611A (en) * | 1979-04-04 | 1980-12-02 | Societe Anonyme Dba | Brake shoe adjusting structure for a drum brake |
| US4573557A (en) * | 1983-10-05 | 1986-03-04 | General Motors Corporation | Drum brake |
| CN2212533Y (en) * | 1995-02-25 | 1995-11-15 | 北京新利奥汽车技术发展公司 | Drum-type rear wheel brake for automobile |
| CN2250889Y (en) * | 1995-12-14 | 1997-04-02 | 张万川 | Double pushing rod direct-movement expanding brake for truck |
| CN1250005A (en) * | 1999-09-01 | 2000-04-12 | 郝玉华 | Balance brakeage enlarger inside brake drum |
| US6918468B2 (en) * | 2001-09-18 | 2005-07-19 | Automotive Products Group Limited | Automatic drum brake adjuster locked at a high temperature |
-
2008
- 2008-11-25 CN CN2008102290018A patent/CN101412398B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB541617A (en) * | 1940-12-02 | 1941-12-03 | Automotive Prod Co Ltd | Improvements in or relating to internal shoe drum brakes |
| US4236611A (en) * | 1979-04-04 | 1980-12-02 | Societe Anonyme Dba | Brake shoe adjusting structure for a drum brake |
| US4573557A (en) * | 1983-10-05 | 1986-03-04 | General Motors Corporation | Drum brake |
| CN2212533Y (en) * | 1995-02-25 | 1995-11-15 | 北京新利奥汽车技术发展公司 | Drum-type rear wheel brake for automobile |
| CN2250889Y (en) * | 1995-12-14 | 1997-04-02 | 张万川 | Double pushing rod direct-movement expanding brake for truck |
| CN1250005A (en) * | 1999-09-01 | 2000-04-12 | 郝玉华 | Balance brakeage enlarger inside brake drum |
| US6918468B2 (en) * | 2001-09-18 | 2005-07-19 | Automotive Products Group Limited | Automatic drum brake adjuster locked at a high temperature |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平9-166162A 1997.06.24 |
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| Publication number | Publication date |
|---|---|
| CN101412398A (en) | 2009-04-22 |
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Granted publication date: 20100602 Termination date: 20211125 |