CN2739410Y

CN2739410Y - Automatic adjusting arm

Info

Publication number: CN2739410Y
Application number: CN 200420076487
Authority: CN
Inventors: 段昌金
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-09-04
Filing date: 2004-09-04
Publication date: 2005-11-09
Anticipated expiration: 2014-09-04

Abstract

The utility model discloses an automatic adjusting arm used for the drum-type braking device of an automobile, comprising a casing. The inner side of the casing is provided with a worm wheel and a worm, and the inner side of the worm is penetrated with a worm shaft. The worm shaft is engaged with the worm, an inner ring is sheathed with one end of the worm shaft and is driven and engaged peripherally with the worm shaft, and an outer ring is supported on the inner ring through a one-way bearing. A drive block is fixedly connected with the outer ring, the outer side of the casing is provided with a connecting rod, and a connecting fork and a transmission rod can compose a plane connecting-rod slide-block mechanism. The lower end of the transmission rod passes through the casing, and is engaged with the drive block in the casing. After the automobile adopts the automatic adjusting arm, the gap of the front and back wheel brake of the automobile can be consistent, the braking can be synchronous, the problem that the automobile has no swing tail and no off tracking can be ensured when the vehicle brakes, and the automatic adjusting arm has the advantage of uniform, stable, safe and reliable performance. The friction plate which is replaced can be convenient, any structure for the original brake can not be changed and any device can not be increased, and the automatic adjusting brake arm can be used by changing the original manual-adjusting brake arm.

Description

Automatically adjust arm

Technical field

The present invention relates to a kind of automatic adjustment arm that is used for automobile drum brake.

Background technique

At present, extensively adopt the brake clearance automatic regulating apparatus in the automobile drum brake.Automatically the structural type of adjusting arm is just like patent 02116502.5,00259577.X, 93247501.9,02284439.2 etc.Automatically adjust arm by housing, worm gear, worm screw, adjust arm, transmission device etc. automatically and partly form.Automatic regulating apparatus will be realized unidirectional rotary motion by its functional requirement, can be divided into four kinds of basic structure types: 1. utilize unidirectional spring just changeing to hold tightly counter-rotating to unclamp and realize that unidirectional delivery rotatablely moves; 2. utilize overrunning clutch to make it and unidirectional rotation to realize that unidirectional delivery rotatablely moves; 3. utilize click to make it and unidirectional rotation to realize that unidirectional delivery rotatablely moves; 4. utilizing face gear to add spring assembly makes it and can only unidirectional rotation realize that unidirectional delivery rotatablely moves.Utilize the shortcoming of the mode of structure of unidirectional spring to be, automatic regulating apparatus relies on spring just changeing the power of holding tightly and transmits the rotating force distance when advancing, just changeing the power of holding tightly and oppositely need overcome spring during manual retraction, structural behaviour is not really stable, is easy to cause automatic regulating apparatus to lose efficacy; Utilize face gear to add automatic regulating apparatus structural also not really stable of spring assembly, the processing technology complexity, cost rises, and is easy to cause automatic regulating apparatus to lose efficacy or toning; Utilize and then have the easy problems such as changing the friction plate inconvenience that is in harmonious proportion of crossing in the mode of structure of click; Utilize the automatic regulating apparatus structural stability of overrunning clutch reliable.At present, utilize one of drive mechanism that overrunning clutch adjusts arm automatically to be: flip sleeve and inner ring end face are the transmission engagement, flip sleeve is provided with external splines and the lower end is internal spline or holder flower, flip sleeve upper end and the empty cover of driving shaft, between be provided with spring, the cylindrical of compact heap and flip sleeve engagement, compact heap is fixedlyed connected with the driving shaft end simultaneously, realizes that indirectly flip sleeve and driving shaft are radially fixing.In this structure, flip sleeve has external splines and blind hole internal spline or holder flower, and the work in-process difficulty is big, the processing cost height, and when the assembling compact heap, difficulty is also big, thereby makes complex structure, the manufacture cost height of whole automatic regulating apparatus; Utilize the overrunning clutch automatic regulating apparatus drive mechanism two be: flip sleeve and inner ring end face are the transmission engagement, flip sleeve and driving shaft are radially fixing, axially by the spring compression power transmission, the drive mechanism of this automatic regulating apparatus has bigger simplification than first kind, flip sleeve does not have external splines and blind hole internal spline or holder flower, but structure is still complicated, manufacture cost is also higher.Transmission device will be implemented in by function and produce a moving movement in the brake operation course simultaneously and pass to automatic regulating apparatus, can be divided into three kinds of basic structure types: 1. spacing chip, as utility model patent 02284439.2,98246521.1,95229939.9; 2. restricted power formula such as utility model patent 93247501.9; 3. four-bar linkage formula is as utility model patent 02116502.5.

Summary of the invention

In order to solve existing automatic adjustment arm self-regulated poor stability, shortcoming that manufacture cost is high, the present invention utilizes the advantage of above-mentioned automatic adjustment arm, simplifies the structure of adjusting arm automatically, proposes a kind of automatic adjustment arm.

For this reason, the technical solution of the utility model is: a kind of automatic adjustment arm, be used for automobile drum brake, and comprise housing, worm gear, worm screw, automatic regulating apparatus, driving mechanism; Automatic regulating apparatus is made up of unilateral bearing, worm shaft, outer ring, drive block, inner ring; Driving mechanism is made up of dowel bar, connecting rod, clevis; Worm shaft penetrates worm screw, worm shaft cylindrical and inner bore of worm are by spline pair or the secondary engagement of polygonal, worm shaft stretches out the outer end of worm screw and adjusts end for handling, inner ring is enclosed within worm shaft and stretches out on the outer the other end of worm screw, the outer ring is bearing on the inner ring by unilateral bearing, drive block is arranged on the axial end of worm shaft, and drive block is fixedlyed connected with the outer ring; Worm shaft and inner ring are the transmission engagement by steel ball or traveller, steel ball or traveller are contained in the radial hole of worm shaft upper edge circumference setting, the supporting member roof pressure of installing in the worm shaft endoporus is at steel ball or traveller afterbody, and supporting member is supported in the worm shaft by elastomer, plug; Dowel bar meshes with the transmission of drive block cylindrical after passing the pilot hole of housing, the clevis stage casing is hinged by bearing pin and housing, one end of clevis one end and connecting rod is hinged, the connecting rod the other end is hinged with the end that dowel bar is stretched outside the housing again, and housing, clevis, connecting rod, dowel bar constitute the planar linkage slide-block mechanism.

The reasonable structural arrangement of described automatic adjustment arm, during use, automatically adjusting arm is connected on the S axle of break by worm gear, in the process of each braking, brake operating is changed into the moving movement of dowel bar by driving mechanism, when automatic regulating apparatus is accepted the motion of dowel bar transmission, worm screw can only export unidirectional rotary motion drive worm gear realize the gap adjust automatically, simultaneously when manual counterrotating worm shaft, worm shaft again can counterrotating satisfies the requirement of replacing brake bush.Should adjust arm automatically and can be used for all drum brakes, the realization gap is adjusted automatically, satisfy the more requirement of renewal of facing renewal simultaneously again, compare with existing automatic adjustment arm, simple in structure, it is high to adjust stability automatically, manufacturing process is simple, low cost of manufacture need not change any structure of former drum brake and increase any device, original hand adjustment brake arm is changed can be used this to adjust arm automatically.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is along the sectional view of B-B among Fig. 1.

Fig. 3 is along the sectional view of C-C among Fig. 1

Embodiment

Automatic adjustment arm as shown in Figure 1, 2, 3, have on the housing 1 two groups in the space orthogonal hole, worm gear 4, worm screw 2 and automatic regulating apparatus are housed respectively, housing 1 is provided with driving mechanism.

Automatic regulating apparatus is made up of unilateral bearing 7, worm shaft 3, outer ring 6, drive block 8, inner ring 9; Driving mechanism is made up of dowel bar 13, connecting rod 15, clevis 16; Worm shaft 3 penetrates worm screw 2, worm shaft 3 cylindricals and worm screw 2 endoporus mesh by spline pair, it is that outer Hexagon is handled the adjustment end that worm shaft 3 stretches out the outer right-hand member of worm screw, inner ring 9 is enclosed within worm shaft 3 and stretches out on worm screw 2 left end outward, outer ring 6 is bearing on the inner ring 9 by unilateral bearing 7, drive block 8 is arranged on the left axial end of worm shaft 3, and the hole interference fit of the axle head of drive block 8 and outer ring 6 makes drive block 8 fixedly connected with outer ring 6; Worm shaft 3 is the transmission engagement with inner ring 9 by steel ball 10, steel ball 10 is contained in the radial hole of worm shaft 3 upper edge circumference settings, spreading steel ball 19 roof pressures of installing in worm shaft 3 endoporus are at steel ball 10 afterbodys, steel ball 10 is stuck in the ball-and-socket of inner ring 9 endoporus, spreading steel ball 19 is supported in the worm shaft 3 by spring 11, plug, spreading steel ball 19 is as supporting member, and spring 11 is as elastomer; The position that dowel bar 13 passes the pilot hole on the housing 1 is provided with the corresponding axial groove that is provided with on projection, the drive block cylindrical, and projection is stuck in the axial groove, thereby makes dowel bar 13 and drive block 8 cylindricals be the transmission engagement; Clevis 16 stage casings are hinged by bearing pin 17 and housing, one end of clevis one end and connecting rod is 14 hinged by shipping and reselling on another market, to stretch out the outer end of housing 14 hinged by shipping and reselling on another market with dowel bar again for the connecting rod the other end, and housing 1, clevis 16, connecting rod 15, dowel bar 13 constitute the planar linkage slide-block mechanisms.The outside at housing 1 also is provided with grease fitting 5, so that lubricated.The housing pilot hole lower end of passing at dowel bar 13 is provided with blanking cover 18.

In the technique scheme, also can be between worm-wheel shaft 3 and the worm screw 2 by the secondary engagement of polygonal.

In the technique scheme, the steel ball 10 in the radial hole that worm shaft 3 upper edge circumference are provided with also can substitute with traveller.

In the technique scheme, the supporting member in the worm shaft 3 is not limited to spreading steel ball 19, also can be the dish of cone or polygonal cone or multijaw shape.Elastomer also is not limited to spring 11, can be rubber parts or torsion spring or liquid leather bag.Also have a kind of situation to be, the elastomer without spring 11 and so on directly compresses supporting member with fastening body, can unclamp fastening body this moment when manual counterrotating worm shaft 3 worm shaft 3 and inner ring 9 disengage from both can.When in technological scheme, adopting the liquid leather bag, can make supporting member obtain constant pretightening force as elastomer.

In the technique scheme, also can the steel ball or the traveller transmission engagement of stretching out in polygonal/arc groove/sour jujube groove and worm shaft 3 holes in the endoporus of inner ring 9.

In the technique scheme, outer ring 6 also can be made of one with drive block 8 and become a part.

In the technique scheme, the manipulation adjustment end that worm shaft 3 stretches out can be the inside/outside polygonal; Also can be inside/outside petal-shaped structure or spline-like structure; It also can be one word/cross recess shape structure.

In the technique scheme, the structural type that is the transmission engagement between dowel bar 13 and the drive block 8 also can be: dowel bar is provided with one section tooth bar, the corresponding gear teeth that are provided with, tooth bar and gear teeth meshing on the drive block cylindrical.Can also be that driving groove and driving pin are supporting, driving groove and the supporting structural type of driving cog.

Main feature of the present utility model is: need not change any structure of former drum brake and increase any device, original hand adjustment brake arm be changed can be used this self-control brake arm.

The engagement of transmission between described dowel bar 13 and the drive block 8 engagement, worm screw 2 and worm shaft 3, the manipulation of worm shaft 3 adjust end structure, worm shaft 3 and the transmission engagement of inner ring 9, the elastomer in the worm shaft 3 and supporting member can be in its transformation range independent assortment; consequent mode of execution is conspicuous, is appreciated that all should drop in the protection domain of the present utility model.

Claims

1, adjusts arm automatically, be used for automobile drum brake, comprise housing, worm gear, worm screw, automatic regulating apparatus, driving mechanism; It is characterized in that: automatic regulating apparatus is made up of unilateral bearing, worm shaft, outer ring, drive block, inner ring; Driving mechanism is made up of dowel bar, connecting rod, clevis; Worm shaft penetrates worm screw, worm shaft cylindrical and inner bore of worm are by spline pair or the secondary engagement of polygonal, worm shaft stretches out the outer end of worm screw and adjusts end for handling, inner ring is enclosed within worm shaft and stretches out on the outer the other end of worm screw, the outer ring is bearing on the inner ring by unilateral bearing, drive block is arranged on the axial end of worm shaft, and drive block is fixedlyed connected with the outer ring; Worm shaft and inner ring are the transmission engagement by steel ball or traveller, steel ball or traveller are contained in the radial hole of worm shaft upper edge circumference setting, the supporting member roof pressure of installing in the worm shaft endoporus is at steel ball or traveller afterbody, and supporting member is supported in the worm shaft by elastomer, plug; Dowel bar meshes with the transmission of drive block cylindrical after passing the pilot hole of housing, the clevis stage casing is hinged by bearing pin and housing, one end of clevis one end and connecting rod is hinged, the connecting rod the other end is hinged with the end that dowel bar stretches out outside the housing again, and housing, clevis, connecting rod, dowel bar constitute the planar linkage slide-block mechanism.

2, automatic adjustment arm according to claim 1 is characterized in that: be provided with grease fitting in hull outside.

3, automatic adjustment arm according to claim 1 and 2, it is characterized in that: the supporting member of installing in the described worm shaft endoporus is a steel ball, and the elastomer of respective support steel ball is a spring; Worm shaft and inner ring are transmission engagement by steel ball, and described steel ball is stuck in the ball-and-socket in the endoporus of inner ring.

4, automatic adjustment arm according to claim 1 and 2, it is characterized in that: the elastomer of the support supporting member of installing in the described worm shaft endoporus is the liquid leather bag.

5, automatic adjustment arm according to claim 1 and 2 is characterized in that: the specific constructive form of described dowel bar and drive block cylindrical transmission engagement is: dowel bar is provided with the corresponding axial groove that is provided with on projection, the drive block cylindrical, and projection is stuck in the axial groove.

6, automatic adjustment arm according to claim 1 and 2 is characterized in that: the specific constructive form of described dowel bar and drive block cylindrical transmission engagement is: dowel bar is provided with one section tooth bar, the corresponding gear teeth that are provided with, tooth bar and gear teeth meshing on the drive block cylindrical.

7, automatic adjustment arm according to claim 3 is characterized in that: the specific constructive form of described dowel bar and drive block cylindrical transmission engagement is: dowel bar is provided with the corresponding axial groove that is provided with on projection, the drive block cylindrical, and projection is stuck in the axial groove.

8, automatic adjustment arm according to claim 3 is characterized in that: the specific constructive form of described dowel bar and drive block cylindrical transmission engagement is: dowel bar is provided with one section tooth bar, the corresponding gear teeth that are provided with, tooth bar and gear teeth meshing on the drive block cylindrical.