CN86100835A - Hydraulic brake brake clearance automatic compensator - Google Patents
Hydraulic brake brake clearance automatic compensator Download PDFInfo
- Publication number
- CN86100835A CN86100835A CN198686100835A CN86100835A CN86100835A CN 86100835 A CN86100835 A CN 86100835A CN 198686100835 A CN198686100835 A CN 198686100835A CN 86100835 A CN86100835 A CN 86100835A CN 86100835 A CN86100835 A CN 86100835A
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- retainer
- bolt
- brake
- brake shoe
- supporting portion
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Abstract
The retainer of between end of the hydraulic operation brake that the brake clearance automatic compensator is housed and brake shoe web, packing into.This retainer has a brake shoe web joint, one with an approximate rectangular fixed installation portion and the waved surface portion of web joint.The fixed installation portion of retainer is installed on the supporting portion of braking branch cylinder by bolt.
Description
The present invention relates to hydraulic brake brake clearance automatic compensator.
As known to, drum brake is designed to be equipped with on the back garden plate structure of a pair of arc brake shoe.The expansion of brake shoe is that an end is a pivot, and the other end is handled with the hydraulic braking wheel cylinder, friction plate on the brake shoe is pressed to and the wheel surface, interior garden of the brake drum that rotates that fuses, thereby realize braking.When the effect owing to braking caused friction disc wear, the brake clearance in friction plate and the brake drum between the surface, garden will increase.And be not subjected to the brake clearance automatic compensator of brake cylinder restriction that brake shoe is expanded, thereby make brake clearance keep constant.
The shortcoming of this class device is in the prior art: be contained in the brake clearance compensation device complex structure in the brake cylinder pressure chamber, the dismounting trouble is added to the difficulties to maintenance.
The objective of the invention is to provide a kind of hydraulic braking clearance automatic compensation device that is contained in the brake cylinder for wheel drag.It is simple in structure, and the number of packages amount is few in addition, can realize automatic compensation function reliably, and assemble easy.
Various embodiments of the present invention are expressed as follows with accompanying drawing:
Fig. 1 is the plan view along Fig. 2 I-I section, and this figure is depicted as the brake clearance automatic compensator according to first embodiment;
Fig. 2 is the plan view along Fig. 1 II-II section;
Fig. 3 is contained in the interior plunger of brake cylinder and the axonometric exploded view of automatic compensator;
Fig. 4 is the retainer axonometric drawing;
Fig. 5 is the sectional front view according to second embodiment's brake clearance automatic compensator;
Fig. 6 is the axonometric drawing of plunger among Fig. 5;
Fig. 7 is according to the basic part sectional view in addition of the 3rd embodiment's brake clearance automatic compensator;
Fig. 8 is the follow-on cut-away section plan view of retainer mounting structure among first embodiment;
Fig. 9 is the main axonometric exploded view of part in addition of structure shown in Figure 8,
Figure 10 is the plan view of the further modified model cut-away section of retainer mounting structure among first embodiment;
Figure 11 is after the brake shoe in the structure shown in Figure 10 is dismantled, the cut-away section plan view of retainer state of living in.
Existing most preferred embodiment of the present invention and improve example and be explained as follows just with reference to accompanying drawing.Be equal to other part or parts all with identical numeral and letter representation among the figure between each embodiment.
At first introduce the first embodiment of the present invention, it is applicable to two self-tightening braking shoe type drum brakes, can be referring to figs. 1 through 4.
Be fixed on a pair of brake cylinder (following brake cylinder cylinder is expression in the drawings) be housed up and down on the back garden plate P of car body, about a pair of brake shoe 2 and 2 are housed, brake shoe relatively afterwards plate P center, garden is symmetric arrangement.
Brake cylinder is by having cylinder endoporus 3a and only the cylinder body 3 and the plunger 5 of an end opening are formed.Plunger 5 is slidingly matched in cylinder endoporus 3a, thereby forms fluid pressure chamber 4 between the closed end of plunger 5 and cylinder body 3.Cylinder body 3 usefulness bolts 30 and 30 are fixed on the garden plate P of back.Retainer 6 is contained on the supporting portion 31 that constitutes above-mentioned closed end.One end of plunger 5 has mesh groove 5a towards pressure chamber 4 on the other end relative with it, brake shoe 2 and 2 hoof web 32a and the respective end of 32a are meshed with it.Engagement between retainer 6 and engaging groove 5a and hoof web 32a, the 32a has prevented relatively rotating between cylinder body 3 and the plunger 5.
Have a filler opening 7(only in Fig. 1, to represent in the brake cylinder 1), enter pressure chamber 4 from the pressure oil of brake main pump (not shown) through this hole.
In the pressure chamber 4 of brake cylinder 1, brake clearance automatic compensator A of the present invention is housed, will describes in detail below.
Large-diameter portion 5b that plunger 5 is slidingly matched by above-mentioned engaging groove 5a, with cylinder endoporus 3a and minor diameter 5c etc. partly form.Minor diameter 5c links to each other with large-diameter portion 5b by the shaft shoulder, and towards pressure chamber 4.The end of minor diameter 5c and flange plate 9 fuse, between the pressure chamber 4 among the latter and the cylinder endoporus 3a for being slidingly matched.When plunger 5 moved axially, flange plate 9 also slided in cylinder endoporus 3a together.Plunger cup 11 is contained on the surface, outer garden near the circular groove 10 of minor diameter 5c, to prevent that pressure oil in the pressure chamber 4 is to external leakage.
On the plunger minor diameter 5c, three garden shape blind holes 12 that garden Zhou Fangxiang is uniform are arranged, these holes are that the junction surface 14 from flange plate 9 one sides passes flange plate 9 and extends.Owing to this three blind holes 12 are arranged, have therefore also formed three meniscate intercommunicating pores 13.Two chambeies about flange plate 9 is separated into pressure chamber 4 are interconnected them by these intercommunicating pores 13.
Conciliation nut 15 is housed on the right side of pressure chamber 4 inner flanges 9.Nut 15 includes 15b of axis body portion and the flange plate 15a of band axial bore 15c.Axial bore 15c makes interior threaded hole, and regulates bolt 19(and will narrate in the back) outside thread be meshed.Flange plate 15a and the 15b of axis body portion are made of one, and are in the side near flange plate 9, and adhere to the junction surface 14 of flange plate 9 and to be connected.Between the flange plate 9 of adjusting nut 15 and plunger 5, do not relatively rotate owing to the effect (introducing later on) of spring retainer 16, and under spring 17 compression force between spring retainer 16 and the flange plate 15a, adjusting nut 15 is pressed on the junction surface 14 of flange plate 9.
Label 15e represents a groove, is when the internal thread of processing adjusting nut 15, is deburring, the garden of screw cutting hole or axis hole 15c week seamed edge and forming.
The flange plate 15a of adjusting nut 15 has three otch 18, and its position is corresponding to the intercommunicating pore 13 of flange plate 9.On the other hand, spring retainer 16 is by an annular spring supporting base 16a who engages with an end of spring 17, with be made of one with spring bearing housing 16a and form from stretch three supporting leg 16c of certain distance of a side, the end of above-mentioned each supporting leg is radially bending to hook 16b outward.
Plunger 5, adjusting nut 15, spring retainer 16 and spring 17 assemble as follows.At first, the flange plate 15a of adjusting nut 15 is linked to each other with the junction surface 14 of the flange plate 9 of plunger 5, and intercommunicating pore 13 is aimed at otch 18.Then, spring 17 is put between adjusting nut 15 and the spring retainer 16, the supporting leg 16c of spring retainer 16 inserts the otch 18 of adjusting nut 15, and its hook 16b is then radially outside from intercommunicating pore 13, hooks the back side of the junction surface 14 of flange plate 9.So spring 17 just is compressed between the spring bearing housing 16a of the flange plate 15a of adjusting nut 15 and spring retainer 16.
Mounted adjusting nut 15 may pressure springs 17 leaves the junction surface 14 of flange plate 9, and this moment is because of supporting leg 16c and otch 18 interlock mutually, so can prevent to relatively rotate between the flange plate 9 of adjusting nut 15 and plunger 5.
Institute is noted that, the design of each otch must have enough areas, can make the right and left of flange plate 9 in the chamber be in connected state by hole 13, even after plunger 5 and adjusting nut 15 assemble, that is to say, under the situation that the concavo-convex engagement of the supporting leg 16c of flange plate 15a by spring retainer 16 and otch 18 is pressed on, also can form connected state at flange plate 9.
Regulating bolt 19 is meshed with the axial bore 15c of adjusting nut 15 by being processed into the externally threaded multiple thread 19a of portion.At adjusting nut 15 and regulate in the engaging piece of 19 on bolt and exist axial idle stroke, it and every brake shoe 2,2, the normal brake application gap corresponding, promptly with every brake shoe 2,2, and the brake clearance between the brake drum that does not show is corresponding.
Regulate bolt 19 and also comprise a 19b of clutch portion, it is positioned at the tip of bolt 19, fuses by being made for minor diameter 19c and the above-mentioned multiple thread 19a of portion that seal groove uses.The 19b of clutch portion can be in cylinder body 3 closed ends (being supporting portion 31) little cylinder diameter portion 20 in rotation and endwisely slipping, promptly match with the conical clutch face 21 of little cylinder diameter portion 20 bottoms.Sealing 22 is contained among the seal groove 19c that regulates bolt 19, drains on the clutch surface 2 to prevent the pressure oil in the pressure chamber 4.In addition, bosom and clutch surface 21 form an air chamber r in the supporting portion 31.
Shown in clear among Fig. 2, the junction surface 33 vertical with the web 32a of corresponding brake shoe 2 is positioned at the end of supporting portion 31.31 a side and junction surface 33 meet at right angles in the supporting portion for the attachment face 34 that retainer 6 usefulness are installed, with afterwards garden plate P is relative.Be processed with screw 35 on the above-mentioned attachment face 34, the inclined-plane 36 by the band corner angle between above-mentioned attachment face 34 and the junction surface 33 links to each other.
Because arc 6c, the supporting base end portion 32b of brake shoe web 32 is near waved surface portion 6c and web joint 6a close proximity, and the floating of brake shoe 2 when preventing to brake prevents that promptly brake shoe 2 from leaving garden plate P afterwards.
When bending retainer 6, the angle between brake shoe web joint 6a and the assembly department 6b be curved acute angle, and the position of mounting hole 6d should be slightly near waved surface portion 6c among the assembly department 6b less than the right angle.
By the above-mentioned arrangement that retainer 6 is carried out, particularly, pressure is effectively distributed because the curved section between brake shoe web joint and the fixed installation portion is done archwise, strengthened the intensity of curved section.And, be positive engagement between brake shoe web and the brake cylinder owing to do not have the gap between brake shoe web joint and the supporting portion junction surface.More because the error on the size can be absorbed by the spring effect of waved surface portion, the processing franchise of making retainer can increase.Owing to adopted the pars convoluta that wafts, the brake shoe wooden dipper during braking appears in one's mind to resemble also to be avoided.
Introduce embodiment's runnability below.
When not braking, the elastic force of Returnning spring (not shown) is applied on the plunger 5 along the direction that plunger is returned by brake shoe 2, this power passes to adjusting nut 15 and regulates bolt 19, remakes and uses on 19b of clutch portion and the clutch surface 21, and produce an engage torque.Because this moment, adjusting nut 15 and adjusting bolt 19 meshed with multiple thread, regulated in the bolt 19 and also produced rotation torque.But therefore above-mentioned engage torque is regulated bolt 19 and can not be rotated greater than the rotation torque of regulating bolt, and plunger still remains on the position of returning.
When the brake main pump (not shown) by filler opening 7 when pressure chamber 4 incoming pressure oil are braked, plunger 5 is along shown in Figure 1 axially advancing to left, brake shoe is pushed to the surface, interior garden of brake drum, because brake drum is connected with the wheel that is rotating is whole, has so just produced braking action.
Surpass predetermined value in the wear extent of friction plate, perhaps brake clearance has just been regulated and compensate under soon the situation in brake operating, and plunger 5 moves forward, and adjusting nut 15 is along with plunger 5 is also mobile simultaneously; And because the effect of spring retainer 16 medi-springs 17 still keeps the state that engages between the two.Because the amount of movement of adjusting nut 15 is corresponding to the idle stroke amount in the screw section, and do not produce rotation torque in the adjusting bolt that adjusting nut 15 is meshed, bolt 19 still adheres to clutch surface 21 and joins, and not redeeming.After braking was removed, another got back to original position plunger 5 and adjusting nut 15.
Under the normal brake application state, the oil pressure in the pressure chamber 4 is lower.Therefore it also is smaller regulating the 19b of clutch portion of bolt 19 and the friction bonding force between the clutch surface 21 in the little cylinder diameter portion 20.If because brake shoe 2 and 2 friction plate experience wear, plunger 5 continues to move outward, and adjusting nut 15 is because the effect of spring retainer 16 medi-springs 17 is for keeping the state that interconnects, also and then mobile.
This amount of movement equals the wear extent that the idle stroke amount adds upper friction plate, certainly greater than the idle stroke amount.Therefore regulate bolt 19 and just integrally move with adjusting nut 15, regulate simultaneously on the bolt 19 the 19b of clutch portion also with little cylinder diameter portion 20 in clutch surface 21 disengagings.Adjusting nut 15 is because the effect of spring 17 is the states that are on the junction surface 14 that is pressed towards flange plate 9 always, and again because the effect of the supporting leg 16c of spring retainer 16 can not relatively rotate it with plunger 5.Like this, the thread engagement portion at adjusting nut 15 and adjusting bolt 19 has produced a rotation torque.Along with the rotation of regulating bolt 19 relative adjustment nuts 15, regulate bolt 19 and move to clutch surface 21 directions, engage again with clutch surface 21 again.Realized the automatic compensation function of brake shoe 2 and 2 upper friction plate wear extenies in this way.If pressure chamber 4 step-down brake offs, brake shoe 2 and 2 can be subjected to the reposition force effect of Returnning spring and draw in.This reposition force acts on the plunger 5 by clutch surface 21 just as a thrust.The 19b of clutch portion is effectively pushed to clutch surface 21, and friction contacts with it, thereby has stoped the rotation of regulating bolt 19.So plunger 5 and adjusting nut 15 can only return with the idle stroke distance that is equivalent to spire between adjusting nut and the bolt 19.The result is, forming a new suitable brake clearance between the surface, garden in friction plate on the brake shoe 2,2 and the brake drum, and this gap just in time is equivalent to the idle stroke of spire.
In case need emergency braking, compensating action had just been realized before pressure chamber 4 internal pressures reach predetermined value automatically.This predetermined value be equivalent to brake shoe 2 and 2 and brake drum etc. begin to produce the value of resiliently deformable.When oil pressure surpasses said predetermined value, the above-mentioned thrust that acts on the 19b of clutch portion that regulates bolt 19 is owing to the pressure of liquid has increased, thrust direction forces clutch 19b and clutch surface 21 to keep frictional engagement towards clutch surface 21, and adjusting bolt 19 can not be rotated.Adjusting nut 15 is still keeping and adjusting bolt 19 relative motionless states because the effect of the supporting leg 16c of spring retainer 16 can not be rotated.But plunger 5 is because the distortion of brake drum etc. continues to move outward.So length of spring compressed, adjusting nut 15 is kept original position with regulating bolt 19, and the junction surface 14 of the flange plate 9 of plunger 5 is separated from adjusting nut 15.In this case, compensating action stops automatically.
As mentioned above, brake clearance automatic compensator among the present invention is contained in the wheel cylinder, forms the adjusting nut of this device, because the relation of spring retainer, with plunger relative transmission does not take place, the spring in the spring retainer makes adjusting nut push plunger to again.Therefore according to the abrasion condition of friction plate, the adjusting bolt can suitably screw out and play regulating action.As long as one emergency braking occurs, plunger just leaves adjusting nut, to prevent overshoot.Owing to the leading role of spring retainer is arranged, plunger and separating steadily and effectively of nut are carried out.In addition, realize, do not need adjusting nut etc. is carried out special improvement and a locking device is provided because the rotational lock of adjusting nut is inner spring-loaded spring retainer.Therefore simple in structure, low cost of manufacture, easy disassembling.
As shown in the above embodiments, in adjusting nut, during Internal Threading, will inevitably form burr at screw opening seamed edge place by plunger flange plate one end.As eliminate above-mentioned burr, and on the flange plate 15a of adjusting nut, have a groove, when pressure oil enters the brake cylinder pressure chamber and brakes, some air remain in the groove because of engaging between adjusting nut and plunger flange plate sometimes.These residual airs are unfavorable to the normal running that guarantees brake cylinder and brake clearance automatic compensator, need to get rid of.Yet get rid of these air is very difficult.
Fig. 5 and embodiment shown in Figure 6 include a structure, and this structure can prevent the residual of above-mentioned air, have kept the advantage that is obtained by first embodiment simultaneously again, therefore show better braking ability.
In second embodiment shown in Figure 6, the flange plate 9 of plunger 5 has groove 42, and this groove outwards stretches three fork-shapeds that are radiation-like from the center of flange plate 9.Groove 42 has formed three intercommunicating pores 43 that are similar to the garden arc on this flange plate 9.Adjusting nut flange plate 15a is assembled into releasable with the junction surface 14 of plunger flange plate 9 and is connected.
The groove 42 of plunger flange plate 9 has its diameter of central part 42a(to be equal to or greater than the diameter of groove 15e on the adjusting nut 15) and three extension part 42b, extension part 42a outward radial from central division extends into three fork-shapeds.Groove 42 should be made has at least 1 extension part 42b to be in the direction roughly the same with the engaging groove 5a of plunger 5, and like this, after installing plunger, extension part 42b must be in position up.Therefore, even if the flange plate 15a of adjusting nut 15 engages with plunger flange plate 9, the residual air in the adjusting nut 15 upper groove 15e also can be shifted to central part 42a rapidly; Particularly be arranged in the air of regulating bolt 19 lower channel 15b, flow into central part 42a by the cone part 19f guiding of regulating bolt 19, and import pressure chamber 4 through extension part 42b, unillustrated exhaust port is discharged from figure then.
Fig. 7 is the third embodiment of the present invention.In above-mentioned second embodiment, have groove 42 on the flange plate 9 of plunger 5, so that groove 15e is communicated with pressure chamber 4 on the adjusting nut; But it should be noted in the 3rd embodiment, have circular groove 15g on the mating face 15f of the adjusting nut 15 that is connected with plunger 5, this groove is used for making groove 15e to be communicated with otch 18.Therefore, only need on plunger flange plate 9, make three intercommunicating pores 53, make by flange plate 9 separate about two pressure chambers be communicated with, three supporting legs of spring retainer 16 pass this three holes.Intercommunicating pore 53 can be made arbitrary shape, as long as can satisfy the requirement of above-mentioned connectivity capabilities.In addition, in this embodiment, the end as the 19a of multiple thread portion is also done in the end of the adjusting bolt 19 that engages with plunger flange plate mating face 14.It should be noted, above-mentioned end also can make with Fig. 5, second embodiment shown in Figure 6 in similar shape.
Fig. 8 and Fig. 9 are a kind of local improvement forms of supporting portion 31 shown in Fig. 1～4 first embodiments and 6 mounting structures of the retainer on supporting portion 31.
In this improves embodiment, supporting portion 31 in from the hole 61 that bolt hole 35 1 sidetrackings one are in communication with the outside, so that bosom sealed chamber r in the clutch surface 21 are communicated with bottom with the construction bolt 37 stubborn bolts hole 35 that close.This intercommunicating pore 61 helps the joint operation of brake clearance automatic compensator A, and makes compensation device A stable working.
In this embodiment, retainer 6 is contained in is performed such on the supporting portion 31, earlier the screw section 37c of construction bolt 37 is inserted among the mounting hole 6d of retainer 6, after treating flange 37a and the upper surface of the 6b of fixed installation portion engaging, again collar 62 is inserted the circular groove 37b that is positioned at the 6b of fixed installation portion below, so that retainer 6 and construction bolt 37 are fitted together, and can relatively rotate.Bolt 39 is tightened against in the screw 35, the retainer 6 and the construction bolt 39 that assemble are fastened on the supporting portion 31; Simultaneously between the end 32b of the brake shoe web joint 6a of retainer 6 junction surface 33 that inserts supporting portion 31 and brake shoe web, and make 6b of fixed installation portion and attachment face 34 fluid-tight engagement, so as will bolt hole 36 seal up all around.
Label 63 expressions are contained in the retainer defining flange of supporting portion 31 1 ends.
Because braking maneuver repeatedly, in the braking surface generation brake shoe wear grooves of brake drum, at this moment the brake shoe that just need more renew will be back-outed the construction bolt 37 of fixed retainer 6 earlier from screw 35; Bolt 37 loosening make the collar 62 that is fitted in retainer 6 lower surfaces promote retainers 6 up (in Fig. 8 for down) mobile, thereby gradually brake shoe web joint 6a is extracted out between supporting portion 31 and brake shoe web 32a.In the slit between an instrument insertion fixed installation portion 6b bottom surface and the stationary plane 34, brake shoe web joint 6a is all extracted out.Degree on the brake shoe 2 embedding brake drum braking surfaces in the brake shoe wear grooves reduces because of the thickness of brake shoe web joint 6a, thereby makes the replacing of brake shoe not be subjected to any obstruction.
After finishing such as the operation of changing brake shoe 2 one classes, the web joining portion 6a with retainer 6 inserts between supporting portion 31 and the brake shoe web 32a again, with construction bolt 37 retainer 6 is fastened on the supporting portion 31, makes the 6b of fixed installation portion seal tight screw 35.
At this moment, retainer 6 and construction bolt 37 have been assembled together by collar 62, thus these in addition parts can not lose, and the fastening work of retainer 6 also can be carried out at an easy rate.
As mentioned above, in the present embodiment, retainer 6 is to be contained on the supporting portion 31 with construction bolt 37 and collar 62, therefore the beginning of screw can be covered fully by bolt 37 and collar 62, thereby improved the sealing at this place, anti-effectively sealing and other liquid are invaded the clutch portion of brake clearance automatic compensator from bolt hole one side via through holes.
Figure 10 and Figure 11 are a kind of structure of renewal, and retainer 6 is contained on the supporting portion 31 in this structure.
In this improved embodiment, supporting portion 31 includes a junction surface 70, and it engages with the web 32a of brake shoe 2 by the brake shoe web joint 6a of retainer 6; And near the connection shoulder 71 of junction surface 70.Connect the plane that the recessed formation one of shoulder is lower than junction surface 70, and be connected with 34 one-tenth approximate right angle of bolt attachment face.
There is a spiral shell head 80a upper end of construction bolt 80, and screw section 80c extends downwards, and one section 80b of guide shaft portion is arranged between screw section 80c and spiral shell head 80a.Screw section 80c is screwed into bolt 80 vertically is contained on the joint 31; Construction bolt 80 inserts among the hole 6e that opens on the 6b of fixed installation portion of retainer 6 loosely, and the diameter of this hole 6e is greater than the diameter of the 80b of guide shaft portion of construction bolt 80.Effect by frustum spiral spring 81 makes retainer plate 6 be positioned at its normal state, spring 81 is around construction bolt 80, and be compressed between the outer surface of the 6b of fixed installation portion of the lower surface of spiral shell head 80a of construction bolt 80 and retainer 6, thereby retainer 6 contacts with retainer installation surface 34 pressure of supporting portion 31.Taper type spring 81 is a larger diameter end in the 6b of fixed installation portion one example.Retainer 6 is bent to form obliquely upward and upwarps 6f, throws off with spring free 81.
Have tooling hole 82 on the plate of back garden, be used to dismantle retainer 6, can finish above-mentioned work passing this hole such as instruments such as screw-driver 83.Hole 82 is positioned on the garden plate of back the 6a lower end position place, web joining portion corresponding to retainer 6, just corresponding to the end of 6a near garden, back plate one side.
Flange on label 84 and the 84 expression supporting portions 31, they are used for preventing the transversion malposition of retainer 6 and floating of brake shoe 2.
Introduce below, when the mutual interference and when making brake drum be difficult to remove mutually of brake drum and brake shoe 2, the step of dismounting brake drum (not shown).Instrument 83 is put in the tooling hole 82 of garden, back plate, instrument 83 tips are withstood on the lower end of the web joint 6a of the junction surface 70 that is clamped in supporting portion 31 and the retainer 6 between the brake shoe web 32a end, when on the direction of leaving back garden plate P, depressing instrument 83, retainer is by the guiding axial region 80b of construction bolt 80, the elastic force that overcomes spring 81 is to a side shifting of leaving garden, back plate direction, web joint 6a is dropped on and being connected on the shoulder 71 that junction surface 70 links to each other from throwing off between brake shoe web 32a and the junction surface 70, and its lower end withstands on the shoulder place of position shown in Figure 11.Like this, the end of brake shoe web 32a just moves on on the junction surface 70 direct position contacting with supporting portion 31, makes brake shoe 2 withdrawals, thereby has avoided the mutual interference mutually between brake shoe 2 and the brake drum; This Back-braking drum is just detachable, also can dismantle brake shoe and similar thing thereof simultaneously.In the process of changing brake shoe, behind the friction plate of removing brake shoe and having worn and torn, the upper fin end 6f of the compressing fixed installation 6b of portion turns to the junction surface 71 of supporting portion 31 the web joint 6a that is bonded on the retainer 6 that connects shoulder 71 places and engages.Because the effect of spring 81, retainer 6 automatically returns on the normal position, that is to say, web joint 6a is forced on the junction surface 70 of supporting portion 31, thereby enters predetermined link position.Just installed to this new brake hoof.
Though in the present embodiment, the shoulder 71 that is connected that links to each other with junction surface 70 is in the state that engages with the close 6a end, web joining portion of the retainer 6 of garden plate P one side afterwards, yet it should be noted,, also can receive the effect of present embodiment fully even if there is not shoulder 71.
Owing to adopted above-mentioned arrangement, in this improvement embodiment, because of retainer can withdraw between supporting portion and web under the situation that needn't unload construction bolt, therefore can with very simple and efficiently way change the maintenance services of part and so in addition such as brake shoe.
Though in the above-described embodiments, the present invention has been used for biplate self-tightening brake shoe drum brake, yet should also be noted that the present invention also can be used for two self energizing effort shoe brakes or singly helps the gesture shoe drum brake and other are similarly in the device.
Claims (4)
1, a kind of brake clearance automatic compensator that is used for hydraulic operation brake, it comprises by the intermeshing adjusting nut of self locking type multiple thread not and regulates bolt, adjusting nut and regulate bolt and pack in the pressure chamber, pressure chamber are slidingly matched by one and are loaded on braking and divide an end of the plunger in the cylinder body and an end wall of this cylinder body to constitute.Said end wall is as a supporting portion, this supporting portion engages with the web of a brake shoe, in pressure chamber, said adjusting bolt has a clutch portion, this clutch usually with end wall of cylinder body on the clutch surface applying that forms, and said adjusting nut is by the effect and the said plunger Elastic Contact of a spring, thereby when brake clearance has surpassed predetermined limits, the described relatively adjusting nut of described adjusting bolt moves axially, to promote plunger advancement, brake clearance is restored to the original state.It is characterized in that said supporting portion engages with the web of brake shoe by a retainer, described supporting portion includes a brake shoe web and connects a surface and a retainer installation surface, this installation surface is connected the surface with web at right angles approximate, said retainer includes a brake shoe web joint, one with an approximate rectangular fixed installation portion and the waved surface portion of web joint.This waved surface portion connects brake shoe web joint and fixed installation portion, and protrudes to described brake shoe web.
2, the modifying device that requires according to claim 1 is characterized in that the brake shoe web connection surface and the retainer installation surface of said supporting portion interconnects by an inclined-plane.
3, according to claim 1 or 2 modifying devices that require, it is characterized in that a bolt hole is arranged on the described supporting portion, this bolt hole and a construction bolt are with thread engagement, this bolt is used for the fixed installation portion of described retainer is installed on the described retainer installation surface, described supporting portion also has an air connect holes, this intercommunicating pore is communicated with described bolt hole and described clutch surface, process the annular groove of a diameter at the opening end of described bolt hole greater than the bolt aperture, described construction bolt has the axle journal of a band circular groove, the collar of can packing in the circular groove, described construction bolt is equipped with described collar is screwed into again in the described bolt hole, just described retainer can be fixedly mounted on the described supporting portion.
4, the modifying devices that require according to claim 1 or 2, it is characterized in that described supporting portion have one with the bolt hole of construction bolt thread engagement, this bolt is used for the fixed installation portion of described retainer is installed on the described retainer installation surface.The fixed installation portion of described retainer also has a hole, this bore dia is greater than the diameter of a collar of described construction bolt, the collar of described construction bolt can pass this hole and stretch out, be contained between described assembly department upper surface and the described construction bolt head lower surface and be in the effect of the spring assembly of compressive state by one, with the retainer installation in position, retainer engages and is supported on this surface with the retainer installation surface of described supporting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86100835A CN86100835B (en) | 1985-04-01 | 1986-02-20 | Self-compensating gear of brade-play for hydraulic brake |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85101200A CN85101200B (en) | 1985-04-01 | 1985-04-01 | Braking clearance self-compensating device for a hydraulic damper brake |
| CN86100835A CN86100835B (en) | 1985-04-01 | 1986-02-20 | Self-compensating gear of brade-play for hydraulic brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86100835A true CN86100835A (en) | 1987-09-02 |
| CN86100835B CN86100835B (en) | 1988-04-06 |
Family
ID=4801223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86100835A Expired CN86100835B (en) | 1985-04-01 | 1986-02-20 | Self-compensating gear of brade-play for hydraulic brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86100835B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394059C (en) * | 2004-05-17 | 2008-06-11 | 株式会社爱德克斯 | Combined service and parking brake apparatus |
| CN102853000A (en) * | 2012-09-15 | 2013-01-02 | 浙江大学台州研究院 | Automobile brake controlled by wire |
| CN112572679A (en) * | 2020-12-16 | 2021-03-30 | 摩拜(北京)信息技术有限公司 | Brake device and shared vehicle |
-
1986
- 1986-02-20 CN CN86100835A patent/CN86100835B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394059C (en) * | 2004-05-17 | 2008-06-11 | 株式会社爱德克斯 | Combined service and parking brake apparatus |
| CN102853000A (en) * | 2012-09-15 | 2013-01-02 | 浙江大学台州研究院 | Automobile brake controlled by wire |
| CN102853000B (en) * | 2012-09-15 | 2014-07-09 | 浙江大学台州研究院 | Automobile brake controlled by wire |
| CN112572679A (en) * | 2020-12-16 | 2021-03-30 | 摩拜(北京)信息技术有限公司 | Brake device and shared vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN86100835B (en) | 1988-04-06 |
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