CN2182902Y - Device for adjusting degree of opening for clutch wheel - Google Patents

Abstract

The utility model relates to a device for adjusting degree of opening for clutch wheel, comprising a cylinder body, a piston, a regulating sleeve, a friction ring, an inner clasp, an outer clasp, a pushing block, a brake shoe 10 and a dust cover 7. The device for adjusting degree of opening for clutch wheel is characterized in that the regulating sleeve 6 is installed at the periphery of the inner piston 9 of the cylinder body 1, and the regulating sleeve, the inner piston and the cylinder body are movable fit meantime. The friction ring 4 is spaced on the piston 9 with the inner clasp 2. A clearance delta is arranged at the right end of the regulating sleeve 6. The outer clasp 8 is fixed on the inner wall of the cylinder body. The novel can self-regulate towards the two-way positive and negative excess clearance, and the self-regulating can relieve the 'self-brake', making the brake always keep running under the optimum clearance. The device for adjusting degree of opening for clutch wheel is an ideal self-regulated device for the clearance of vehicle.

Description

Device for adjusting degree of opening for clutch wheel

The utility model belongs to the shoe brake wheel cylinder and opens gap automatic regulating device.

At present, the automatic regulating apparatus in shoe brake gap is mainly two classes both at home and abroad, and the one, step type, the 2nd, the formula of once harmonizing, the present invention is improved on the formula basis of once harmonizing.The existing once adjustment formula hydraulic wheel cylinder deploying device that uses both at home and abroad, its principle is as shown in Figure 1: when between break and drum during for no excessive gaps, the piston △ that moves to right, break just is braked, at this moment uncompensation; When between break and drum excessive gaps being arranged, piston moves to right also must drive move to right the in advance excessive gaps value of break of friction ring behind the △, break can be braked, return △ during return, and piston has compensated excessive gaps with the leading amount of movement that the friction ring is done when braking; When break is braked, brake drum produces enlargement deformation when being subjected to braking force and braking hot, vehicle is left alone without help sail after, drum will bounce back under the normal temperature, between the hoof of break and drum " stopping certainly " phenomenon just may appear at this moment, so existing people set bigger that gap width establishes to the △ in the shoe brake self-reacting device, be generally 1.4 millimeters to 1.8 millimeters, relation according to brake clearance and stopping distance, the big more stopping distance of brake clearance is far away more, so braking safety is just poor, reason is existing shoe brake self-reacting device to can not self-regulated less than the negative excessive gaps of setting gap △, can not self-regulated remove " stopping certainly ".

The purpose of this utility model is to design a kind of hoof of no matter break and the gap between drum has or not excessive gaps, and positive excessive gaps, still negative excessive gaps all can be adjusted this gap automatically, make it remain on the deploying device of △ value.

The utility model is achieved in that in cylinder interior, cover is adjusted in being peripherally equipped with of piston, have oil seal groove and oil sealing is housed on the cylindrical of adjustment cover and the cylindrical of piston, cylinder body, adjust cover and piston for movingly, the friction ring is spacing on piston with interior snap ring, axial limiting is for movingly, friction encircles to be contained in to adjust in the cover and is interference fit with the adjustment cover, the friction of its cooperation is greater than acting on 0.5～1.5 times of return spring power on the hoof, friction ring is flexiblely to have wear-resisting material again and make, be provided with gap △ at the left end of adjusting cover, the value of △ is for having now about half of " formula of once harmonizing hydraulic wheel cylinder deploying device ", and outer snap ring is fixed on the inboard wall of cylinder block, jacking block is connected with piston, brake shoe leans on jacking block, and dust-proof cover one end is fixed on the cylinder body outer rim, and an end is fixed on the piston.Realize finely tuning also can on the basis of this device, increase unclasping mechanism for better, this mechanism is achieved in that electromagnet is contained in and unclasps on the seat, unclasping seat is screwed on base plate, spring is contained in and unclasps in the seat, be pressed into and prevent that trip arm from withdrawing from voluntarily, the trip arm worker pass the bottom with it movingly braking bottom board and the hole on the cylinder body, when work, insert in the groove hole of adjusting cover, this groove is also surplus the △ gap, structure can be put bar when needing and propose, electromagnet is put forward power and can not used hydraulic pressure, air pressure, lever completely instead and realize its function.Guide finger is fixed on the cylinder body, and its head enters in the groove of adjusting cover, makes to adjust to overlap and can move axially, and can realize fine adjustment function.

The utility model compared with prior art, 1. break appearance " stopping certainly " is permitted in the left alone without help back of sailing of vehicle, disapproves " stopping certainly " during operation.2. can carry out the self-regulated compensation of two-way (positive and negative) excessive gaps, can self-regulated remove " stopping certainly ".3. it is less that break is set the gap.4. improve self-regulation performance, improve braking ability, reduce to brake lag time, reduce stopping distance, improve braking safety.

Be elaborated below in conjunction with accompanying drawing:

Fig. 1 is existing technology " formula of once harmonizing hydraulic wheel cylinder deploying device " schematic representation.

Fig. 2 is the utility model I type structural representation.

Fig. 3 is the utility model II type structural representation.

Adjust cover 6 and cylinder body 1 and piston 9 among Fig. 2 for movingly, the interior snap ring of friction ring 4 usefulness of opening 2 is spacing on piston 9, friction ring 4 is an interference fit with adjustment cover 6, cover 6 left ends and boss place, cylinder body 1 middle part are being adjusted in the position of gap △, outer snap ring 8 is fixed on cylinder body 1 inwall at the right-hand member of adjusting cover 6, adjust on cover 6 and the piston 9 oil sealing 3 is housed respectively, with oil sealing 5, jacking block 11 is connected movingly with piston 9 right-hand members, the brake shoe folder leans against on the jacking block 11, dust-proof cover 7 one ends are fixed on cylinder body 1 outer rim, one end is fixed on the piston 9, according to principle of uniformity also can on the basis of Fig. 2, set up one unclasp mechanism also can realize two-way (just, negative) excessive gaps is from conditioning function, as shown in Figure 3, the title of part preface 1---11, structure shape, matching relationship, the performance effect is all identical with Fig. 2, repeat no more, electromagnet 16 is contained in and unclasps on the seat 15 among Fig. 3, its removable armature and trip arm 13 are affixed, unclasping seat 15 is screwed on braking bottom board, spring 14 is a stage clip, pine establish bar 13 bottoms pass with it movingly braking bottom board and the hole on the cylinder body 1 in the groove hole of adjusting cover 6, the also gapped △ in this time slot hole, guide finger 12 is fixed on the cylinder body 1, and its head enters in the guiding groove of adjusting cover 6 and gets final product.

Now illustrate:

Example 1, see Fig. 2, when brake clearance greater than △, when promptly excessive gaps being arranged, piston is under the oil pressure effect during braking, piston 9, friction ring 4, adjustment cover 6 move to right, cover 6 moves to when pushing up outer snap ring 8, and piston 9 and friction ring 4 also will move right to the break braking, when not braking, because the effect of return spring, piston 9, friction ring 4 and adjust cover 6 can only return △ distance, so reduced brake clearance, i.e. just excessive gaps self-regulated; When brake clearance less than △, when promptly bearing excessive gaps (from a flash), only occur in the left alone without help back of sailing, the minimum clearance of thoroughly separating because of break is generally at 0.2～0.5 millimeter, now set the gap and deposit is arranged greater than this value, and frequent braking in service, so " stopping certainly " can not appear in break during driving, " stopping certainly " only appears at left alone without help car state when being automobile installation the utility model, driving advance the row once fully the braking,, adjust friction that cover 6 can overcome friction ring 4 and move to right till △ pushes up outer snap ring 8 to the limit, behind the brake off less than △ in oil pressure effect lower piston 9 leadings, under the effect of return spring, adjust cover 6, friction ring 4, piston 9 brake shoes 10 are return △ synchronously, so brake clearance reverts to former setting gap △, " stopping certainly " removed.Vehicle driving, normal operation, i.e. negative excessive gaps self-regulated.

Example 2: see Fig. 3, work as vehicle driving, during running state, trip arm 13 is pressed in the groove hole of adjusting cover 6 by spring 14, and the setting gap is △, the compensation of its two-way (positive and negative) excessive gaps, and the action principle of removing " stopping certainly " is all identical with last example.Position, trip arm 13 terminations and groove hole as shown in Figure 3 during braking, during brake off, the right closing in termination and the groove hole, sail maybe " stopping certainly " state may occur the time when left alone without help, press push button, electromagnet 16 proposes to adjust the groove hole of cover 6 to trip arm 13, and the setting gap of self-reacting device was L, promptly unclasped gap width this moment, L is elected to be reliably the gap that prevents " stopping certainly ", and running principle is adjusted the same example.

Claims (7)

1, a kind of shoe brake wheel cylinder opens clearance self-adjusting device, mainly by cylinder body 1, piston 9, adjust cover 6, friction ring 4, interior snap ring 2, outer snap ring 8, jacking block 11, brake shoe 10, constitute with dust-proof cover 7, piston 9 is in cylinder body 1, jacking block 11 is connected movingly with piston 9, brake shoe 10 folders lean against on the jacking block 11, dust-proof cover 7 one ends are fixed on cylinder body 1 outer rim, the other end is fixed on the piston 9, it is characterized in that: be peripherally equipped with one at cylinder body 1 internal piston 9 and adjust cover 6, therebetween for movingly, the interior snap ring of friction ring 4 usefulness 2 is spacing on piston 9, friction ring 4 is interference fit in adjusting cover 6 and with the adjustment cover, be provided with clearance delta at the left end of adjusting cover 6, outer snap ring 8 is fixed on cylinder body 1 inwall.

2, self-regulating according to claim 1 is put, its feature also is: also have a cover to unclasp mechanism on cylinder body 1, this mechanism is by electromagnet 16, unclasp seat 15, spring 14 and trip arm 13 constitute, electromagnet 16 is contained in and unclasps on the seat 15, unclasping seat 15 is fixed on the base plate, spring 14 is packed into and is unclasped in the seat 15, trip arm 13 bottoms pass with it movingly braking bottom board and the hole of cylinder body 1, when work, insert in the groove hole of adjusting cover 6, this groove is also surplus the △ gap, guiding lock 12 is fixed on the cylinder body 1, and its head enters in the groove of adjusting cover 6, and adjustment cover 6 can be moved axially.

3, put according to claim 1,2 described self-regulatings, it is characterized in that: friction ring 4 is for being flexiblely to have wear-resisting material again and make.

4, put according to claim 1,2 described self-regulatings, it is characterized in that: on the cylindrical of the cylindrical of adjusting cover 6 and piston 9, have oil seal groove and oil sealing 3 and 5 are housed.

5, put according to claim 1,2 described self-regulatings, it is characterized in that: friction ring 4 with adjust the friction of overlapping 6 greater than acting on 0.5～1.5 times of return spring power on the brake shoe 10.

6, self-regulating according to claim 1 is put, and it is characterized in that: at the gap △ that the right-hand member of adjusting cover 6 is provided with, the △ value is 0.5 millimeter to 1.2 millimeters.

7, self-regulating according to claim 2 is put, and it is characterized in that: when unclasping mechanism according to need of work, electromagnet 16 can propose trip arm 13, and electromagnet is put forward power and can be used hydraulic pressure, air pressure, lever when not enough instead and realize the function mentioned.

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