CN101737443B - Automatic gap adjusting device for double-leading shoe and double-trailing shoe brake - Google Patents
Automatic gap adjusting device for double-leading shoe and double-trailing shoe brake Download PDFInfo
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- CN101737443B CN101737443B CN2009102173362A CN200910217336A CN101737443B CN 101737443 B CN101737443 B CN 101737443B CN 2009102173362 A CN2009102173362 A CN 2009102173362A CN 200910217336 A CN200910217336 A CN 200910217336A CN 101737443 B CN101737443 B CN 101737443B
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- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 210000000003 hoof Anatomy 0.000 description 6
- 210000003739 neck Anatomy 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Abstract
The invention relates to an automobile brake device, in particular to an automatic gap adjusting device for a double-leading shoe and double-trailing shoe brake. The device comprises a drum brake with two brake cams and worm gear and worm type gap adjusting devices. The device is characterized in that the two brake cams are provided with the worm gear and worm type gap adjusting devices respectively; and brake arms of both worm gear and worm type gap adjusting devices are connected with ratchet gap adjusting mechanisms fixedly arranged on a bottom plate of the drum brake through two connecting rods respectively. The device adds the ratchet gap adjusting mechanisms on the basis of the drum brake with two camshafts and two cams, and can automatically realize gap adjustment after a friction plate and a brake drum are abraded. The device has the characteristic of reasonable structure.
Description
Technical field
The present invention relates to automobile braking device, particularly the double-leading shoe and double-trailing shoe brake automatic gap adjusting device.
Background technique
For the cam brake in the drum brake, when its working principle is braking, braking overall pump promotes the brake arm rotation, thereby driving the camshaft that is installed on the brake arm rotates to an angle, the brake shoe that matches with cam is opened, by being installed in the effect that friction plate on the brake shoe and the frictional force between the brake drum reach braking.Because wheel rotates, it is asymmetric that brake drum acts on the pressure left and right sides of brake shoe, causes reinforcement voluntarily or subtract the effect of power voluntarily.Therefore, a side brake shoe of reinforcement is called the neck hoof voluntarily in the industry, and a side brake shoe that subtracts power voluntarily is called from hoof, and the degree of wear of two braking shoe friction plates is also just different.In order to keep good retardation efficiency, a best clearance value to be arranged between brake shoe and the brake drum.Along with the wearing and tearing between friction plate and the brake drum, the gap between friction plate and the brake drum increases, thereby causes the effective working stroke and the Braking efficiency of break to be affected, may the crisis traffic safety when serious.For guaranteeing the normal clearance between friction plate and the brake drum, on October 13rd, 1993 was authorized disclosed " drum brake brake clearance automatic regulating apparatus ", the patent No.: 92214959.3 in by China Intellectual Property Office.This patent is on the basis of existing Worm-gear type lash adjusting device, ratchet mechanism has been installed on worm shaft, when the gap between friction plate and the brake drum increases to design load when above, stirring ratchet by ratchet rotates, drive worm screw, worm gear rotation commentaries on classics then, rotate to an angle thereby drive the camshaft and the cam that link to each other with worm gear, change the initial position of brake shoe.
And " drum-type 4-block 8-piece brake without tangent point " that the inventor applied on August 31st, 1998, the patent No.: ZL99243883.7, this patent is that relative fixed is equipped with two brake cylinders or brake cam in brake drum, drive four brake shoes by two brake cylinders or brake cam, realize the purpose of brake.Because above-mentioned brake shoe is four, like this when braking, will occur two voluntarily the neck hoof of reinforcement and two subtract voluntarily power from hoof." drum-type 4-block 8-piece brake without tangent point " though structure can make the wearing and tearing of friction plate even, and can guarantee that the area of contact between friction plate and the brake drum is constant substantially, improved the braking effect of drum brake, but also there is the problem that the gap after the wearing and tearing is adjusted between friction plate and the brake drum in it.
Summary of the invention
The objective of the invention is to overcome the defective of above-mentioned prior art, provide a kind of two necks two from formula automatic gap adjusting braking device at drum brake with twin cam shaft and cam.
For achieving the above object, the solution of the present invention is as follows: a kind of double-leading shoe and double-trailing shoe brake automatic gap adjusting device, comprise the drum brake and the Worm-gear type lash adjusting device that have two brake cams, it is characterized in that on two brake camshafts the Worm-gear type lash adjusting device being installed all, the brake arm in the above-mentioned two Worm-gear type lash adjusting devices links to each other with ratchet clearance adjustment mechanism on being fixedly mounted on the drum brake base plate by two connecting rods respectively.
Above-mentioned ratchet clearance adjustment mechanism comprises fixed plate that is fixedly mounted on the drum brake base plate and the axle that is fixed on the fixed plate, ratchet is rotatable to be sleeved on the axle, the ratchet that annular is arranged on the endoporus that ratchet and axle match, the ratchet that matches with ratchet is housed on axle, end face at ratchet has the waist shape elongated slot concentric with ratchet, dial is rotatable to be sleeved on the axle, is fixed with the bearing pin that matches with waist shape elongated slot at the end face of dial, and above-mentioned two brake arms are hinged by two connecting rods and dial.
Two the waist shape elongated slots of the waist shape elongated slot that the end face of above-mentioned worm gear is opened for being symmetrically distributed.
The cylindrical of above-mentioned ratchet is a worm gear, is furnished with a worm screw mutually with above-mentioned worm gear.
The present invention installs the Worm-gear type lash adjusting device respectively on two camshafts of the drum brake with twin cam shaft and cam, simultaneously the brake arm in the Worm-gear type lash adjusting device is linked to each other with ratchet clearance adjustment mechanism on being fixedly mounted on the drum brake base plate by two connecting rods respectively, like this after wearing and tearing between friction plate in the drum brake and the brake drum, the angle of swing of two brake arms will increase, when surpassing design angle be, ratchet and the home position between the ratchet in the ratchet clearance adjustment mechanism will change, the angle that resets that has so just changed the ratchet clearance adjustment mechanism changes, driving two brake arms that link to each other with two connecting rods simultaneously rotates to an angle, thereby driving the camshaft and the cam that link to each other with worm gear rotates to an angle, change the initial position of brake shoe, reach the purpose of adjusting play.This device has characteristic of reasonable structure.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1 of the present invention;
Fig. 3 is the B-B sectional view of Fig. 2 of the present invention;
Schematic representation when Fig. 4 eliminates the gap for the present invention;
Fig. 5 is the another kind of structural representation of Figure 1A of the present invention-A sectional view;
Fig. 6 is the structural representation of dial of the present invention;
Fig. 7 is Fig. 6 left view of the present invention.
Embodiment
Automatic gap adjusting device of the present invention is applicable to cam open type drum brake break, and two cam and camshafts 11 that distribute relatively must be arranged in this drum brake, with two cams match four brake shoes are arranged, when car brakeing, in four brake shoes, will occur two voluntarily the neck hoof of reinforcement and two subtract voluntarily power from hoof, this is the source of " the two necks two from " described in the technical program just, so such break also just is referred to as " double-leading shoe and double-trailing shoe brake ".
As shown in Figure 1, on two relative camshafts 11 up and down, be separately installed with the Worm-gear type lash adjusting device of existing structure, brake arm 4 in the last Worm-gear type lash adjusting device links to each other with dial 6 in the ratchet clearance adjustment mechanism by upper hinge 3, connecting rod I 2, brake arm 10 in the same Worm-gear type lash adjusting device down links to each other with dial 6 in the ratchet clearance adjustment mechanism by hinge 9 down, connecting rod II 8, is to link to each other by hinge 7 between above-mentioned two connecting rods and the dial 6.Four brake shoes are fixed on the drum brake base plate 12 by four brake shoe supporting shafts 1.
The ratchet clearance adjustment mechanism is installed with fixed plate 5 on drum brake base plate 12 shown in Fig. 2,3,4, be fixed with axle 13 on fixed plate.On axle, order is set with ratchet 14 and dial 6 from the bottom to top, has the ratchet of annular on the endoporus that ratchet and axle match, and the ratchet 17 that matches with ratchet is housed on axle, it is concentric with ratchet that symmetry has two waist shape elongated slots, 18, two waist shape elongated slots on the upper-end surface of ratchet.In dial and ratchet opposing end faces, be fixed with the bearing pin 15 that matches with waist shape elongated slot.
When brake, brake weight promotes connecting rod I 2 and moves up, connecting rod I 2 drives the brake arm of going up in the Worm-gear type lash adjusting device 4 by upper hinge 3 and clockwise rotates, driving dial 6 by hinge 7 rotates counterclockwise, brake arm 10 under driving by dial, hinge 7, connecting rod II 8 simultaneously in the Worm-gear type lash adjusting device rotates counterclockwise, cam rotation about so just driving on two camshafts 11 will strut with four brake shoes that cam matches, and brakes.When wearing and tearing are in predetermined range between friction plate on being installed in brake shoe and the brake drum, dial 6 will be swung in the several angle scope, as shown in Figure 3, bearing pin 15 on the dial 6 will move to the b point by a point, just the angle of swing of dial is less than or equal to waist shape elongated slot 18 and the formed arc round angle α in ratchet center, and this moment, bearing pin 15 did not drive ratchet 14 rotations.After wearing and tearing overshoot between friction plate on the brake shoe and the brake drum, cam angle of swing on the camshaft 11 will increase, pass through brake arm, when connecting rod passes on the dial 6, the angle of swing of dial will be greater than waist shape elongated slot 18 and the formed arc round angle α in ratchet center, as Fig. 4,6, shown in 7, bearing pin 15 on the dial will move to the c point by original b point at this moment, ratchet will be driven along rotating counterclockwise by bearing pin 15 like this, will produce relative rotation between the ratchet of ratchet endoporus and the ratchet at this moment, and this relative rotation will be fixed by ratchet, this rotation just is unidirectional, the position of waist shape elongated slot will change on the ratchet like this, be the position that ratchet has turned over one or two ratchet counterclockwise, the b point moves to the c point.When removing brake weight, because bearing pin 15 terminating points move to the c point by the b point, just make that the angle of revolution of dial will be less than arc round angle α, after passing to connecting rod, brake arm, camshaft by dial like this, when being reflected on the cam, the angle of revolution of cam also will reduce, and change the initial position of brake shoe, wearing and tearing between friction plate and the brake drum are eliminated like this, have just eliminated the gap.
As shown in Figure 5, the braking gap that one side causes for the gap of eliminating connecting rod, hinge, matching relationship when guaranteeing assembling on the other hand between bearing pin 15 and the waist shape elongated slot 18, the cylindrical of ratchet is a worm gear, is furnished with a worm screw 16 mutually with this worm gear, by rotary worm 16, just can drive ratchet 14 rotations, adjust the matching relationship between above-mentioned gap and bearing pin 15 and the waist shape elongated slot 18.
Claims (3)
1. double-leading shoe and double-trailing shoe brake automatic gap adjusting device, comprise the drum brake and the Worm-gear type lash adjusting device that have two brake cams, it is characterized in that on two brake camshafts (11), the Worm-gear type lash adjusting device being installed all, brake arm in the above-mentioned two Worm-gear type lash adjusting devices links to each other with ratchet clearance adjustment mechanism on being fixedly mounted on drum brake base plate (12) by two connecting rods respectively, above-mentioned ratchet clearance adjustment mechanism comprises the fixed plate (5) that is fixedly mounted on the drum brake base plate (12) and is fixed on axle (13) on the fixed plate, ratchet (14) is rotatable to be sleeved on the axle (13), the ratchet that annular is arranged on the endoporus that ratchet and axle match, the ratchet (17) that matches with ratchet is housed on axle, end face at ratchet has the waist shape elongated slot (18) concentric with ratchet, dial (6) is rotatable to be sleeved on the axle (13), end face at dial is fixed with the bearing pin (15) that matches with waist shape elongated slot, and above-mentioned two brake arms are hinged by two connecting rods and dial.
2. double-leading shoe and double-trailing shoe brake automatic gap adjusting device according to claim 1 is characterized in that two the waist shape elongated slots of waist shape elongated slot (18) for being symmetrically distributed that above-mentioned ratchet end face is opened.
3. double-leading shoe and double-trailing shoe brake automatic gap adjusting device according to claim 1 and 2, the cylindrical that it is characterized in that above-mentioned ratchet (14) is a worm gear, is furnished with a worm screw (16) mutually with above-mentioned worm gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102173362A CN101737443B (en) | 2009-12-26 | 2009-12-26 | Automatic gap adjusting device for double-leading shoe and double-trailing shoe brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102173362A CN101737443B (en) | 2009-12-26 | 2009-12-26 | Automatic gap adjusting device for double-leading shoe and double-trailing shoe brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101737443A CN101737443A (en) | 2010-06-16 |
| CN101737443B true CN101737443B (en) | 2011-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102173362A Expired - Fee Related CN101737443B (en) | 2009-12-26 | 2009-12-26 | Automatic gap adjusting device for double-leading shoe and double-trailing shoe brake |
Country Status (1)
| Country | Link |
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| CN (1) | CN101737443B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104724437A (en) * | 2013-12-23 | 2015-06-24 | 世进技术株式会社 | Variable-chute-device packaging machinery corresponding to packaging unit weight |
| CN105333039B (en) * | 2015-12-14 | 2018-02-13 | 河南恒远恒山工业有限公司 | A kind of lash adjusting device of crane hoisting mechanism roll brake |
| CN111411621B (en) * | 2020-03-09 | 2024-12-27 | 长江三峡通航管理局 | Ship lift safety mechanism clearance adjustment device and adjustment method thereof |
| CN112572679B (en) * | 2020-12-16 | 2022-05-10 | 摩拜(北京)信息技术有限公司 | Brake device and shared vehicle |
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- 2009-12-26 CN CN2009102173362A patent/CN101737443B/en not_active Expired - Fee Related
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| CN101737443A (en) | 2010-06-16 |
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Granted publication date: 20110727 |