CN101280815A - Vehicle drum type hydraulic brake clearance automatic adjustment device - Google Patents

Abstract

The invention relates to a brake clearance of an automobile hydraulic drum brake, which is provided with an auto-adjusting device and adopts the mechanical energy stored by a spring for adjusting; when the brake clearance of the leading-trailing shoe friction discs of the brake, that is, when a screw 2, a push-rod 22 or the travel distance of the opposite motions of the screw 2 and the push-rod 22 is smaller than or equal to the set clearance 16, a contact end 11 and a friction end 34 are in a contact status, and an adjusting nut 8 is driven by a torsion spring 7 and clockwise rotated and adjusted to the contact status, so as to maintain the set clearance value 16.

Description

Vehicle drum type hydraulic brake clearance automatic adjustment device

Technical field:

The invention belongs to the single wheel cylinder double-action of automobile, tractor and motor vehicle drum-type thereof hydraulic brake clearance mechanical type automatic adjustment technology field, being specifically related to a kind of vehicle drum type hydraulic brake clearance has the band automatic control tegulatingdevice.

Background technique:

Vehicle drum type hydraulic brake clearance has the band automatic control tegulatingdevice, be not with automatic adjusting controlling device, difference because of working method, regulative mode, the automatic controlling mechanism of minicar, Light-duty Vehicle is not seen and is indiscriminately imitated application mutually, Light-duty Vehicle has very major part not be with automatic controlling mechanism, and the obvious efficient of manual adjustment is not high.Several millimeters approximately, tens millimeters of the thickness of braking frictional plate, visible regulation range is also little.Although drum brake has the trend of being got your generation with respect to disk type braker.

Summary of the invention:

The purpose of this invention is to provide a kind of employing spring energy-storage formula break clearance automatic adjustment device, after brake clearance surpasses the setting gap width, the position of the brake clearance when both designing, controlling mechanism utilize the mechanical energy of spring storage, the vehicle drum type hydraulic brake clearance automatic adjustment device that automatically adjusts.This self-regulation structure is by the screw rod sub-assembly, push rod sub-assembly, wheel cylinder, extension spring, brake shoe, brake drum, Xiao Ding form, and wherein the screw rod sub-assembly is made up of screw rod 2, adjusting nut 8, torsion spring 7, connecting sleeve 3, cushion collar 33, attaching nut 36, bolt 6,10,35, non-return bolt 38; The push rod sub-assembly is made up of push rod 22, flip sleeve 14, thrust spring 20, jump ring 21, dust-break cover 30.Guide rod 18 is set on screw rod 2, outside thread 12, twine end 5, twine the end internal thread, catch 4, the catch internal thread, right fork-shaped connects to be pricked, guide rod 18 is cylindrical guide rod, the section right and wrong of twining end 5 are orbicular, connect the internal thread place of fastening torsion spring 7 and be to reduce gradually on every side at it, arc transition, make after bolt 6 connects fastening torsion spring 7, the height of bolt 6, near the just circle height that twines end 5, promptly radial direction basic to, catch 4 is used to stop that torsion spring 7 can not be crossed it, catch 4 is provided with some internal threads, moving tooth 9 is set on the adjusting nut 8, friction side 34, some connecting sleeve internal threads and cushion collar internal thread, moving tooth 9 be rectangle or right-angled triangle, it on circumference the plurality of teeth of five equilibrium, be used for ripple and stir adjusting nut 8, transfer big brake clearance, friction side 34 is coarse end faces, as file, have the such profile of tooth of right-angled triangle, torsion spring 7 is lamelliform, at its two ends attachment hole is set, some attachment holes are set on the connecting sleeve 3, torsion spring 7 groove of packing into, butt welding bolt 37 thereon, non-return hole 39, positive stop end 1, after positive stop end 1 makes adjusting nut 8 be adjusted to the setting limit travel, conflict on the catch 4, make adjusting nut 8 can not continue to regulate, some attachment holes are set, some buffering pawl arms 32 on the cushion collar 33, some buffering collets 29.Stepped bore, outer-hexagonal 13 (or external splines), outer thrust end 15, jump ring groove, left fork-shaped attachment hole are set on push rod 22, stepped bore, bigger Kong Buyu outside thread 12 contact, less hole is guide rod hole 19, contacts with guide rod 18, keep its both coaxality, interior hexagonal (or internal spline), interior thrust end 17, contact jaw 11 are set on flip sleeve 14, contact jaw 11 is coarse end face, has the profile of tooth as the right-angled triangle as file.Adjusting nut 8 spinnings are connected on the outside thread 12, the attachment hole of one end of torsion spring 7 connects to be fastened on to twine by bolt 6 holds 5, the attachment hole of the other end is fastened on the connecting sleeve 3 by bolt 37, nut 36 connections, connecting sleeve 3 is fastened on the adjusting nut 8 by some bolts 35 connections, cushion collar 33 is fastened on the adjusting nut 8 by some bolts 10 connections, dirt-proof boot 45 is installed on the connecting sleeve 3, non-return bolt 38 passes non-return hole 39 and is installed on the catch 4 and (uses before normal working), constitutes the screw rod sub-assembly; Flip sleeve 14 is installed in axial sliding on the outer-hexagonal 13, jump ring 21 is installed in the jump ring groove of push rod 22, thrust spring 20 is installed in the centre of jump ring 21 and dust-break cover 30 and flip sleeve 14, constitute the push rod sub-assembly, guide rod 18 is installed in the guide rod hole 19, keeps both coaxalitys, when screw rod 2,, push rod 22 or both move toward one another strokes be less than or equal to when setting gap width 16, contact jaw 11 is contact condition with the sassafras end 34 that rubs, and adjusting nut 8 does not rotate adjusting; When screw rod 2, push rod 22 or both move toward one another strokes are when setting gap width 16, and contact jaw 11 is held 34 separated attitudes with the sassafras that rubs, and adjusting nut 8 clockwise direction (seeing from right to left) rotation under the driving of torsion spring 7 is regulated, to contact condition, keep it to set gap width 16.

Description of drawings:

Fig. 1 is installed in the structural representation of break for automatic controlling mechanism.

Automatic adjustment state schematic representation when Fig. 2 is friction disc wear.

Fig. 3 is the enlarged view of contact jaw 11 and friction side 34 separated attitudes.

Among the figure: 1, positive stop end, 2, screw rod, 3, connecting sleeve, 4, catch, 5, twine end, 6. bolt, 7 torsion springs, 8, adjusting nut, 9, pull out tooth, 10, bolt, 11, contact jaw, 12 outside threads, 13, outer-hexagonal, 14, flip sleeve, 15 outer thrust ends, 16, set gap width, thrust end in 17,18, guide rod, 19, guide rod hole, 20 thrust springs, 21, jump ring, 22 push rods, 23 left pins, 24 left side brake drums, 25 left friction plates, 26 left brake shoes, 27, returning pull-spring, 28, left side push rod, 29, the buffering collet, 30. dust-break covers, 31, brake cylinder, 32, buffering pawl arm, 33, cushion collar, 34 friction sides, 35 bolts, 36, nut, 37, bolt, 38, the non-return bolt, 39, the non-return hole, 40, right push rod, 41, right braking hoof, 42, right friction plate, 43, brake drum of front wheel right hand and left hand, 44, right pin, 45, dirt-proof boot.

Embodiment:

This automatic controlling mechanism can be set up this device from the basis of shoe type at former break list wheel cylinder double-action neck, as long as setting up the space allows, do not move interference, no matter the break of which kind of form all can be set up, general technology such as the part of this device can be cast (essence), car, bores, mills, punching press can be produced.The assembling of this automatic controlling mechanism: assembling screw rod sub-assembly, can on shelving, dedicated set carry out, fixing adjusting nut 8, guide rod on the screw rod 2 18 is passed adjusting nut 8 to link together with outside thread 12 spinnings, and touch and twine 5, bolt 6 is passed the attachment hole of an end of torsion spring 7, be fastened on and twine end 5, rotation adjusting nut 8, screw rod 2 (rotation assembling frame), twine torsion spring 7, torsion spring on the connecting sleeve 3 groove (not marking among the figure) of packing into passes torsion spring 7, the attachment hole of torsion spring 7 is packed into to being welded in the bolt 37 on the connecting sleeve 3, spinning nut 36 is connected and fixed, trace is rotationally connected and overlaps 3, some internal threads on the adjusting nut 8 are alignd with some attachment holes on the connecting sleeve 3, being screwed into bolt 35 is connected and fixed, trace is rotationally connected and overlaps 3, alignd with the internal thread of catch 4 in non-return hole 39, be screwed into non-return bolt 38, promptly adjusting nut 8 has been realized that the locking (see figure 1) is contained in dirt-proof boot positive stop end 1 side of connecting sleeve 3 in advance, take off the screw rod 2 and the part of adorning from the assembling frame, because the locking effect of non-return bolt 38, adjusting nut 8 can not rotate adjusting automatically, cushion collar 33 is packed into from guide rod 18 ends, be connected and fixed with some bolts 10, screw rod sub-assembly assembling so far finishes.The assembling of push rod sub-assembly: can on dedicated set is shelved, carry out, fixing push rod 22, the flip sleeve 14 that interior hexagonal (or internal spline) is arranged is installed in axial sliding on the outer-hexagonal (or external splines) 13, the dust-break of packing into cover 30, the thrust spring 20 of packing into, in compression thrust spring 20, the jump ring 21 of packing into, push rod sub-assembly assembling so far finishes.Fit together two sub-assemblys this moment, and cushioning the cylindrical that pawl 29 passes flip sleeve 14, cushion collar arm 32 is upspring, to interior thrust end 17 left ends, advance guide rod 18 simultaneously and wear and be installed in the guide rod hole 19, this automatic controlling mechanism assembling finishes, and can be installed on wheel drag.Fig. 1 is installed on the structural representation of break for the automatic controlling mechanism of this brake clearance, after this mechanism is installed on break, at first back out non-return bolt 38, remove locking to adjusting nut 8, push to dirt-proof boot 45 in 39 places, non-return hole, this mechanism gets final product proper functioning.When depressing brake petal when braking, the right push rod 40 of brake cylinder 31 promotes right braking hoof 41 and right friction plate 42 pressed rightwards brake drums 43, and right braking hoof 41 drives with the hinged screw rod 2 of pin 44 and moves right; Simultaneously, left side push rod 28 promotes left brake shoe 26 and left friction plate 25 is pressed to left side brake drum 24 (24 and 43 are same brake drum), left side brake shoe 26 drives and pin 23 hinge pin 44,23 hinge gap are ignored, push rod 22 to left movement, thrust spring 20 promotes flip sleeve 14 and moves right, contact jaw 11 is contacted with friction side 34 all the time, when right friction plate 42, left side friction plate 25 abrasions, behind the attenuate, screw rod 2 workers continue to move right, push rod 22 continues to left movement, when making the interior thrust end 17 of flip sleeve 14 conflict outer thrust end 15, flip sleeve 14 can not move right, can only be in company with push rod 22 simultaneously to left movement, thrust end 17 stroke that outer thrust end 15 move of conflicting is setting gap width 16 in this, the brake clearance of right exactly friction plate 42 and brake drum of front wheel right hand and left hand 43 adds the value of the brake clearance of left friction plate 25 and left side brake drum 24, flip sleeve 14 in company with push rod 22 to left movement, that contact jaw 11 will disengage with friction side 34, separated state appears, see Fig. 2, Fig. 3, at this moment, adjusting nut 8 is under the situation that does not have the contact friction resistance, driving clockwise direction (seeing from right to left) rotation by torsion spring 7 regulates, make friction side 34 conflict contact jaw 11 again and stop to regulate, return to contact condition.Pine returns brake petal, right braking hoof 41, left side brake shoe 26, screw rod 2, push rod 22 are retracted by returning pull-spring 27 respectively, brake off, the pulling force of returning pull-spring 27, be far longer than the elastic force of thrust spring 20, when retracting, adjusting nut 8 promotion flip sleeves 14 are to left movement and compress thrust spring 20, conflict on the end face of outer-hexagonal 13 until adjusting nut 8, adjusting nut 8 promotes flip sleeves 14 to left movement and the stroke that moved of conflicting, be exactly to set gap width 16 on the end face of outer-hexagonal 13.The width of torsion spring 7 is greater than the length of adjusting nut 8 adjustment stroke, is that 20 millimeters, the adjustment stroke of that adjusting nut 8 are then less than 20 millimeters as the width of torsion spring.Moving tooth 9 can only be dialled big brake clearance, and can not dial little brake clearance because of the structure of its contact jaw 11 with friction side 34.The effect of cushion collar 33 is when brake clearance is excessive, slow down adjusting nut 8 at the inertia impact of rotation multi-turn adjusting to contact jaw 11, as dialling big brake clearance, after following wheel is safeguarded, when depressing brake petal, because of brake clearance excessive, adjusting nut 8 can the rotation multi-turn be regulated, this will certainly produce rotatory inertia and impact, for overcoming this phenomenon cushion collar 33 is set, be cushion collar 33 3 times in the normal brake application gap, during the gap of 4 times of grades, begin to work, when depressing the brake petal braking, excessive brake clearance makes contact jaw 11 and friction side 34 8 rotations of back adjusting nut occur separating and regulates, after cushioning pawl 29 and flip sleeve 14 contact, the appearance rotational resistance and the adjusting of slowing down maybe can not be regulated, and pine returns the brake petal brake off, after buffering pawl 29 leaves flip sleeve 14, before touching contact jaw 11 to friction side 34, adjusting nut 8 rotations are regulated.Repeat said process, when depressing the brake petal braking, still be in contact condition, promptly set the gap width state until contact jaw 11 and friction side 34.

Claims (1)

1. vehicle drum type hydraulic brake clearance automatic adjustment device is by the screw rod sub-assembly, the push rod sub-assembly, wheel cylinder, extension spring, brake shoe, brake drum, pin is formed, it is characterized in that on screw rod 2, being provided with guide rod 18, outside thread 12, twine end 5, catch 4, moving tooth 9 is set on adjusting nut 8, friction side 34, at torsion spring 7 two ends attachment hole is set, on connecting sleeve 3, be provided with if the dried attachment hole of sense, connecting bolt 37, non-return hole 39, positive stop end 1, buffering collet 29 is set on cushion collar 33, on push rod 22, stepped bore is set, outer-hexagonal 13, outer thrust end 15, the jump ring groove, interior hexagonal is set on flip sleeve 14, interior thrust end 17, contact jaw 11, adjusting nut 8 spinnings are connected on the outside thread 12, the attachment hole of one end of torsion spring 7 connects to be fastened on to twine by bolt 6 holds 5, the attachment hole of the other end is by bolt 37, nut 36 connections are fastened on the connecting sleeve 3, connecting sleeve 3 is fastened on the adjusting nut 8 by some bolts 35 connections, cushion collar 33 is fastened on the adjusting nut 8 by some bolts 10 connections, dirt-proof boot 45 is installed on the connecting sleeve 3, non-return bolt 38 passes non-return hole 39 and is installed on the catch 4 and (uses before normal working), flip sleeve 14 is installed in axial sliding on the outer-hexagonal 13, jump ring 21 is installed in the jump ring groove of push rod 22, thrust spring 20 is installed in the centre of jump ring 21 and dust-break cover 30 and flip sleeve 14, guide rod 18 is installed in the guide rod hole 19, when screw rod 2, push rod 22 or both move toward one another strokes are less than or equal to when setting gap width 16, contact jaw 11 is contact condition with friction side 34, adjusting nut 8 does not rotate adjusting, when screw rod 2, push rod 22 or both move toward one another strokes are when setting gap width 16, contact jaw 11 and friction side 34 separated attitudes, adjusting nut 8 is at the driving backspin modulation joint of torsion spring 7, to contact condition.

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