CN107366698B - Wear indicator for adjusting arm and brake clearance adjusting arm - Google Patents
Wear indicator for adjusting arm and brake clearance adjusting arm Download PDFInfo
- Publication number
- CN107366698B CN107366698B CN201710814205.7A CN201710814205A CN107366698B CN 107366698 B CN107366698 B CN 107366698B CN 201710814205 A CN201710814205 A CN 201710814205A CN 107366698 B CN107366698 B CN 107366698B
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- rotating disc
- mounting box
- switch
- hole
- adjusting arm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
- F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
- F16D66/025—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness sensing the position of parts of the brake system other than the braking members, e.g. limit switches mounted on master cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention provides a wear indicator for an adjusting arm and a braking clearance adjusting arm, and belongs to the technical field of machinery. The wear indicator solves the problems that the existing wear indicator is easy to interfere and cannot guarantee accurate alarm. This a wear indicator for adjusting arm includes on-off switch, mounting box and rolling disc, and in the mounting box was located to the on-off switch, the mounting box had spacing hole, and the rolling disc is located spacing downthehole and rolling disc and spacing hole formation radial spacing, is equipped with the ring channel on the spacing downthehole wall, and the outer edge of rolling disc is located the ring channel and the rolling disc is spacing between the both sides cell wall of ring channel, and ring channel part or run through completely and the rolling disc can rotate for the mounting box, and the rolling disc is equipped with the bulge that can trigger on-off switch in the part of the ring channel that runs through. The wear indicator for the adjusting arm and the braking clearance adjusting arm have the advantages of high working precision, difficult interference and the like.
Description
Technical Field
The invention belongs to the technical field of machinery, and relates to a wear indicator for an adjusting arm and a braking clearance adjusting arm.
Background
Normal braking of a car is achieved by contact between a brake drum and a brake shoe friction lining in a drum brake and by friction, and a car brake clearance refers to a clearance which must be maintained between the brake drum and the brake shoe friction lining, and the friction lining wears out during long-time friction to cause the brake clearance to be larger and larger, so an adjusting arm capable of automatically adjusting the brake clearance between the brake shoe and the brake drum must be arranged in a brake mechanism, as disclosed in chinese patent No.: 03227352.5 it includes the camshaft installed on the S-shaped brake shaft of the car, the camshaft is covered with the body, the worm gear is put in the body, and is covered on spline on the camshaft, there are shifting rings at both ends of the worm gear, one of them is fixed with the shifting fork, another shifting ring is fixed with the driving lever, the driving lever can contact with micro-gap switch fixed on body, the micro-gap switch connects the alarm; a small shaft is also arranged in the shell, a worm wheel matched with the worm is fixed on the small shaft, a grooved wheel is also arranged on the small shaft, the end face of the grooved wheel can be meshed with the clutch sleeve, grooves are formed on the shifting ring and the grooved wheel, and two ends of the connecting rod are embedded in the grooves.
When the braking clearance is adjusted, the worm drives the worm wheel to rotate, and the worm wheel drives the S-shaped cam shaft to rotate so as to compensate and adjust the braking clearance. However, when the friction lining wears to a limit, the angle through which the S-cam shaft rotates has reached a maximum value and the brake clearance cannot be adjusted, at which point a new friction lining needs to be replaced. In order to solve the problem, the automatic regulator for the automobile brake clearance is also provided with a brake lining wear alarm device consisting of a deflector rod and a microswitch, and the wear alarm principle is as follows: when the gap is adjusted, the worm wheel can rotate, the shifting ring and the shifting rod fixed on the shifting ring rotate along with the worm wheel, when the worm wheel rotates to a certain angle, the brake lining is worn to the limit, and at the moment, the shifting rod can press the micro switch to enable the micro switch to be connected with a brake lining alarm arranged in a cab so as to remind a driver of timely replacing the brake lining.
Although the automatic automobile brake clearance adjuster can give an alarm in time when the abrasion of the brake lining reaches a limit through the arrangement of the brake lining abrasion alarm device, the automatic automobile brake clearance adjuster also has some defects: after the brake lining alarm device is arranged on an automobile, a shell of the regulator is connected with a brake air chamber, a shifting fork is fixed on an automobile axle and is kept motionless, the space between the brake air chamber and the automobile axle is relatively narrow, a shifting rod for realizing brake lining abrasion alarm is fixed on one shifting ring and is directly exposed outside, and a micro switch is fixed on the shell and is directly exposed outside, so that the distribution of the whole brake lining alarm device is relatively dispersed, and the matching requirement is relatively high; on the other hand, as a plurality of mechanisms are usually arranged between the automobile brake air chamber and the axle and the positions among the mechanisms are relatively compact, the risk that the deflector rod and the micro switch are interfered by other mechanisms is caused when the deflector rod and the micro switch are directly exposed outside, so that accurate alarm cannot be carried out.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art, and provides a wear indicator for an adjusting arm and a brake clearance adjusting arm, which are to solve the technical problem of how to ensure the working accuracy of the wear indicator.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a wear indicator for adjusting arm, includes the break-make formula switch that is used for controlling, its characterized in that, wear indicator still includes can connect in the mounting box of adjusting arm lateral wall and can be connected and receive the rolling disc of adjusting arm control with the adjusting arm, in the mounting box was located to the break-make formula switch, the mounting box has spacing hole, the rolling disc is located spacing downthehole and rolling disc and spacing hole formation radial spacing, spacing downthehole wall on be equipped with the ring channel, the outer edge of rolling disc is located the ring channel and the rolling disc is spacing between the both sides cell wall of ring channel, ring channel part or run through completely and the rolling disc can rotate for the mounting box, the rolling disc is equipped with the bulge that can trigger break-make formula switch in the part of the ring channel that runs through.
The wear indicator is mainly used on a brake clearance automatic adjusting arm of a drum brake and used for alarming when the friction pad of the drum brake is worn to a limit value. The maximum rotation angle of the rotating disc is designed according to the limit wear value of the friction pad, the initial relative position of the bulge on the rotating disc and the on-off switch is designed according to the angle, the bulge is slowly close to the on-off switch through the rotation of the rotating disc in the process of slowly wearing the friction pad, the bulge on the rotating disc is enabled to just rotate by the maximum angle and trigger the on-off switch when the friction pad is worn to the limit value, and the wear limit alarm of the friction pad is realized.
This wear indicator will take the rolling disc of bulge to replace the driving lever among the prior art, set up on-off switch to the mounting box in, the rolling disc sets up in spacing hole and the outer ring channel that is located on the pore wall of spacing hole of the outer edge of rolling disc, because the rolling disc can rotate for the mounting box, consequently only need set up the ring channel into partly or run through completely, set up the bulge on the part of rolling disc at the ring channel that runs through and make the rolling disc possess the part that can trigger on-off switch to by bulge trigger on-off switch after the rolling disc rotates through the angle corresponding with the limit wear value of friction pad. The radial limit is formed between the rotating disc and the limit hole, so that radial movement of the rotating disc cannot be generated in the rotating process, and meanwhile, the rotating disc is limited between the groove walls at the two sides of the annular groove, so that axial movement of the rotating disc cannot be generated in the rotating process, the rotating disc can be stably positioned on the mounting box while rotating through combination of the radial limit and the axial limit, the rotating stability of the rotating disc is ensured, and the matching precision of the protruding part and the on-off switch in the rotating process of the rotating disc is well improved; in addition, the rotating disc is supported by the limiting hole and the annular groove, the groove width of the annular groove is generally limited, other parts are difficult to penetrate into the annular groove even if the rotating disc stretches into the limiting hole except for a disc-shaped structure similar to the rotating disc, and the other parts can not penetrate into the annular groove basically under the condition that the outer edge of the rotating disc passes through the annular groove, so that the possibility that the on-off switch is triggered by the other parts is avoided, and the working precision of the wear indicator is well ensured.
In the wear indicator for the adjusting arm, the rotating disc is provided with the annular supporting portion, the supporting portion is located in the limiting hole, and the outer side wall of the supporting portion abuts against the hole wall of the limiting hole.
The rotating disc is provided with an annular supporting part, and the outer side wall of the supporting part is propped against the wall of the limiting hole when the rotating disc is positioned in the limiting hole. Through such setting, on the one hand make the rolling disc can carry out free rotation and cooperate with on-off switch for the mounting box, on the other hand can make the rolling disc can not appear radial float and make its cooperation stability with on-off switch receive the influence for the mounting box again, this alarm accuracy of this wear indicator has also been guaranteed to a certain extent.
In the wear indicator for the adjusting arm, the rotating disc further comprises a disc body and a flanging, the supporting portion is arranged on one side of the disc body, the flanging is arranged on the outer side of the supporting portion, the flanging is limited in the annular groove, a non-circular connecting hole used for connection is formed in the center of the disc body, and one port of the limiting hole is located on one side of the mounting box.
When the rotary disc is specifically assembled, the disc body and the supporting part of the rotary disc are positioned in the limiting hole, the flanging of the rotary disc is positioned in the annular groove, the rotary disc is propped against the wall of the limiting hole by the outer side wall of the supporting part to form radial limiting, and meanwhile, the rotary disc is axially limited by the two side walls of the annular groove, so that the rotary disc can stably rotate to improve the matching precision of the protruding part and the on-off switch.
In addition, a connecting hole is formed in the center of the disc body, so that one side of a mounting box where one port of the limiting hole is located is connected with the side wall of the adjusting arm, the rotating disc is sleeved on a shaft part (such as a cam shaft) which can rotate when a braking gap is formed in the adjusting arm through the limiting hole and the connecting hole, and the connecting hole is non-circular, the rotating disc can be driven to synchronously rotate when the shaft part rotates only by connecting the connecting hole to the non-circular structure of the shaft part, and the on-off switch is triggered after the protruding part rotates by a set angle corresponding to the limit abrasion value of the friction pad. And because the on-off switch and the rotating disc are fixed in the mounting box, the rotating disc and the on-off switch are integrally assembled in the mounting box when being connected to the adjusting arm, and then the shaft part on the adjusting arm is inserted into the limiting hole and the rotating disc is ensured to be sleeved on the shaft part to form circumferential fixation when the mounting box is connected to the adjusting arm, the step of fixing the shaft part and the rotating disc is omitted, so that the wear indicator can be integrally disassembled, and the whole wear indicator is disassembled from the adjusting arm only by disassembling the mounting box from the adjusting arm, thereby well improving the applicability of the wear indicator and the convenience of disassembly.
In the wear indicator for the adjusting arm, the mounting box comprises a box body and an inner cover connected with the box body, wherein an annular flange I is arranged on one side of the inner cover opposite to the box body, an annular flange II is arranged on one side of the box body opposite to the inner cover, the inner walls of the annular flange I and the annular flange II are the hole walls of the limiting holes, the annular groove is formed between the annular flange I and the annular flange II, the annular flange I abuts against one side of the rotating disc, and the annular flange II abuts against the other side of the rotating disc.
The inner cover is provided with the annular flange I, the box body is provided with the annular flange II, when the inner cover and the box body are connected to form the mounting box, the inner holes of the annular flange I and the annular flange II just form a part of the limiting hole, and meanwhile, the annular flange II is propped against one side of the rotating disc through the annular flange I and is propped against the other side of the rotating disc, which is equivalent to the fact that the rotating disc is clamped between the annular flange I and the annular flange II, so that the axial movement of the rotating disc is prevented, namely the axial limiting of the rotating disc is achieved, the matching stability of the rotating disc and the on-off switch is improved, and the working precision of the wear indicator is guaranteed.
In the above wear indicator for an adjusting arm, the on-off switch is a push button type micro-switch, the protruding portion includes a mating section and a connecting section connecting the mating section with the flange outer side wall, the connecting section protrudes from the flange outer side wall and bends towards one side of the flange, and two sides of the mating section protrude out of two sides of the connecting section and bend inwards to make the mating section be in a convex shape.
The on-off switch adopts the button type micro switch to mean that the triggering part of the on-off switch is a triggering button, but because the convex part does not press the triggering button from the front, but contacts from the side and presses the triggering button in the rotating process of the rotating disc, the triggering button has a certain height, so that in order to smoothly press the triggering button, two sides of the matching section are required to extend out of two sides of the connecting section and bend inwards to enable the matching section to be in an outward convex shape during processing, and thus the inwards bent part on the matching section is contacted with the triggering button firstly, so that the triggering button can be smoothly pressed in the rotating process of the rotating disc, and the matching precision of the rotating disc and the on-off switch is ensured.
In the wear indicator for the adjusting arm, the connecting hole is a splined hole, and an arc-shaped adjusting hole is formed in one side of the mounting box.
The connecting hole is arranged as a spline hole, so that the rotating disc and the shaft part can well realize synchronous rotation of the shaft part and the rotating disc through spline fit, and particularly, the rotating disc is connected to the cam shaft for example, and the outer spline part is only required to be elongated when the cam shaft is machined because the cam shaft is provided with the outer spline part, so that the cam shaft is simplest to machine.
The spline teeth on the outer side of the cam shaft and the spline inner holes of the rotating disc cannot be completely aligned and cannot be assembled when the cam shaft is assembled, the arc-shaped adjusting holes are formed in the mounting box, so that the mounting box can be finely adjusted relative to the cam shaft, the assembly becomes simple, and when the mounting box swings to finely adjust the angle, the relative positions of the protruding portions on the rotating disc and the on-off switch are relatively fixed, so that the protruding portions and the on-off switch are not influenced by the cooperation of the protruding portions and the on-off switch.
The brake clearance adjusting arm comprises a shell and a cam shaft, wherein one end of the cam shaft is inserted into the shell and can rotate when a brake clearance is generated, the wear indicator comprises an on-off switch used for controlling display, and the brake clearance adjusting arm is characterized in that the wear indicator further comprises a rotating disc and a mounting box, the mounting box is connected to one side of the shell, the on-off switch is arranged in the mounting box, the mounting box is provided with a limiting hole, the rotating disc is located in the limiting hole, the rotating disc and the limiting hole form radial limiting, an annular groove is formed in the inner wall of the limiting hole, the outer edge of the rotating disc is located in the annular groove, the rotating disc is limited between two side groove walls of the annular groove, the annular groove penetrates partially or completely and can rotate relative to the mounting box, the cam shaft stretches into the limiting hole, the rotating disc is sleeved on the cam shaft and is circumferentially fixed with the cam shaft, and a protruding portion of the penetrating annular groove is provided with a protrusion capable of triggering the on-off switch.
When the automatic adjusting arm adjusts the braking clearance, the cam shaft in the shell can rotate by a certain angle, and as the rotating disc is sleeved on the cam shaft and circumferentially fixed with the cam shaft, after the cam shaft rotates by a certain angle, the protruding part on the rotating disc also rotates by the same angle. According to the principle, the maximum angle value of the camshaft rotating can be calculated in advance, and the relative position between the bulge on the rotating disc and the on-off switch in the initial state is set according to the maximum angle value, so that the bulge on the rotating disc can just trigger the on-off switch when the camshaft rotates by a set angle.
The rotating disc with the protruding part is used for replacing a deflector rod in the prior art in the wear indicator, the on-off switch is arranged in the mounting box, the rotating disc is arranged in the limit hole, the outer edge of the rotating disc is positioned in the annular groove on the wall of the limit hole, and the rotating disc can rotate relative to the mounting box, so that the annular groove can be only required to be partially or completely penetrated, the protruding part is arranged on the penetrating annular groove of the rotating disc, so that the rotating disc is provided with a part capable of triggering the on-off switch, and the on-off switch is triggered by the protruding part after the rotating disc rotates by an angle corresponding to the limit wear value of the friction pad. The radial limit is formed between the rotating disc and the limit hole, so that radial movement of the rotating disc cannot be generated in the rotating process, and meanwhile, the rotating disc is limited between the groove walls at the two sides of the annular groove, so that axial movement of the rotating disc cannot be generated in the rotating process, the rotating disc can be stably positioned on the mounting box while rotating through combination of the radial limit and the axial limit, the rotating stability of the rotating disc is ensured, and the matching precision of the protruding part and the on-off switch in the rotating process of the rotating disc is well improved; in addition, the rotating disc is supported by the limiting hole and the annular groove, the groove width of the annular groove is generally limited, other parts are difficult to penetrate into the annular groove even if the rotating disc stretches into the limiting hole except for a disc-shaped structure similar to the rotating disc, and the other parts can not penetrate into the annular groove basically under the condition that the outer edge of the rotating disc passes through the annular groove, so that the possibility that the on-off switch is triggered by the other parts is avoided, and the working precision of the wear indicator is well ensured.
In the brake clearance adjusting arm, the worm wheel capable of rotating relative to the shell is arranged in the shell, the cam shaft is inserted into the worm wheel and is in spline fit with the cam shaft, and the cam shaft is in spline fit with the rotating disc.
The cam shaft in the existing adjusting arm is driven to rotate by the worm wheel through the spline, so that the cam shaft and the rotating disc are simplest to process through spline fit, the length of the spline is only required to be lengthened on the cam shaft, the spline fit mode is a fit mode capable of well achieving synchronous rotation of the rotating disc and the cam shaft, and the fact that the protruding portion on the rotating disc just rotates by the same angle after the cam shaft rotates by the largest angle can be guaranteed to trigger the on-off switch.
And the camshaft and the worm wheel can also reduce certain cooperation requirement through spline fit, after the rotating disc and the on-off switch are positioned in the installation box, the installation box can be integrally connected to the camshaft only by just facing the inner spline teeth on the rotating disc and the outer spline teeth on the camshaft, and finally, the installation box and the shell are connected together.
In the braking gap adjusting arm, the mounting box is provided with an arc-shaped adjusting hole, a pin shaft is arranged in the arc-shaped adjusting hole, and one end of the pin shaft penetrates into the shell.
The arc-shaped adjusting holes are formed in the mounting box, so that the mounting box can be swung to finely adjust the angle so as to meet the requirement of assembly. The purpose of doing so is mainly in order to finely tune the installation box, especially to adopting the rotating disk and camshaft to pass through this kind of scheme of spline fit, because the rotating disk is clamp between the box body and the inner cup of installation box earlier when the installation, and the one end of camshaft passes the worm wheel that sets up in the casing and inserts in the installation box and pass through spline fit with the rotating disk, then the circumstances that the spline tooth in the camshaft outside can not be exactly just right with the spline hole of rotating disk and can't assemble can appear when the assembly, adopt such structure to finely tune and just can make the assembly become simple, and when the installation box swings and carry out the fine setting of angle, the bulge on the rotating disk is relatively fixed with the position of on-off switch, therefore can not influence the cooperation of bulge and on-off switch yet.
In the braking gap adjusting arm, the pin shaft sequentially comprises a head part, a thread section and a polished rod section, the head part is propped against one side of the mounting box, which is opposite to the shell, a lock nut is arranged on one side of the mounting box, which is opposite to the shell, the thread section penetrates through the arc-shaped adjusting hole and is in threaded connection with the lock nut, the shell is provided with a positioning hole, the polished rod section is inserted into the positioning hole, the camshaft is provided with an elastic check ring for the shaft, and the elastic check ring for the shaft is propped against the rotating disc.
In theory, it is most convenient to directly process full threads on the pin shaft, and the mounting box and the shell are connected through threads, but because the threads are connected through threads, the pin shaft is generally required to be screwed so as to ensure that the threads are not sent out, and because the mounting box is required to swing, the mounting box cannot be fixed with the shell through other fasteners, so that only one connecting point is formed between the mounting box and the shell, the situation that the mounting box is tilted upwards by taking the pin shaft as a pivot point in the braking process easily occurs, the mounting box is deformed or even torn, and the rotating disc and the cam shaft are possibly blocked so as to influence the adjustment of the braking gap.
Therefore, this braking clearance adjustment arm is through setting up the round pin axle into head, screw thread section and polished rod section, the head supports and leans on one side that mounting box and casing are on the back of the body mutually, screw thread section pass arc regulation hole and with lock nut threaded connection, press from both sides between head and lock nut through the mounting box so that the round pin axle can not deviate from in the arc regulation hole, simultaneously in the epaxial polished rod section of round pin inserts the locating hole on the casing, polished rod section only plays the supporting role of mounting box when the swing, the mounting box does not form fixedly with the casing this moment, there is the problem that mounting box and casing are separated. Then, the elastic check ring for the shaft is arranged on the cam shaft, and the elastic check ring for the shaft acts on the turntable to block the turntable, so that the problem that the shell is separated from the mounting box is solved. By adopting the mode, the problem of fixing the mounting box with the shell when the mounting box does not swing is solved, and the mounting box can be prevented from being torn.
Compared with the prior art, the invention replaces a deflector rod in the prior art by the rotating disc with the convex part, sets the on-off switch in the mounting box, sets the limit hole on the mounting box and the annular groove on the wall of the limit hole, the rotating disc is positioned in the limit hole and forms radial limit, and the outer edge of the rotating disc is positioned in the annular groove and forms axial limit, so that the rotating disc can be stably positioned on the mounting box and stably rotate through the limit hole and the annular groove, and the alarm precision of the wear indicator is well ensured; meanwhile, the arrangement of the annular groove prevents the on-off switch from being triggered by other components, and the alarm precision of the wear indicator is well ensured.
Drawings
Fig. 1 is a schematic view of a brake clearance adjustment arm in a first embodiment.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a schematic view of the wear indicator of the first embodiment without electrical connection wires.
Fig. 4 is an internal schematic view of the wear indicator in an initial state in the first embodiment.
Fig. 5 is a partial cross-sectional view taken along the direction A-A in fig. 4.
Fig. 6 is a cross-sectional view of fig. 5 without the rotatable disk.
Fig. 7 is a sectional view in the direction B-B of fig. 4.
Fig. 8 is an internal schematic view of the wear indicator of the first embodiment at the alarm point.
Fig. 9 is an enlarged view of the protrusion of fig. 8 in contact with the on-off switch.
Fig. 10 is a schematic view of a rotating disc in a wear indicator in accordance with the first embodiment.
In the figure, 1, a shell; 1a, positioning holes; 2. a cam shaft; 3. a worm wheel; 4. an on-off switch; 4a, a trigger part; 4b, mounting columns; 5. a rotating disc; 5a, a tray body; 5a1, a connection hole; 5b, a supporting part; 5c, flanging; 5d, a protruding part; 5d1, a connecting section; 5d2, a matching section; 6. a mounting box; 6a, inner cover; 6a1, annular flange one; 6a2, support columns; 6b, a box body; 6b1, mounting holes; 6b2, annular flange two; 6c, a movable cavity; 6d, limiting holes; 6e, an annular groove; 6f, wire outlet holes; 6g, arc-shaped adjusting holes; 7. a pin shaft; 7a, a head; 7b, a thread section; 7c, a polished rod section; 8. an electrical connection line; 9. and (5) locking the nut.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 and 2, a brake clearance adjusting arm includes a housing 1, a worm wheel 3 and a cam shaft 2, wherein the worm wheel 3 is disposed in the housing 1 and can rotate relative to the housing 1, one end of the cam shaft 2 is inserted into the housing 1, the worm wheel 3 is sleeved on the cam shaft 2 and is in spline fit with the cam shaft 2, and the specific structure of the brake clearance adjusting arm for an automobile can refer to an automatic brake clearance adjusting arm for an automobile with application number 201611140721.8 proposed by the applicant.
The wear indicator comprises a rotating disc 5, an on-off switch 4 and a mounting box 6, wherein the mounting box 6 is connected to one side of the shell 1, the on-off switch 4 is fixed in the mounting box 6, the mounting box 6 is provided with a limiting hole 6d, an annular groove 6e is formed in the inner wall of the limiting hole 6d, the rotating disc 5 is positioned in the limiting hole 6d, the side wall of the rotating disc 5 abuts against the wall of the limiting hole 6d to form radial limiting, the outer edge of the rotating disc 5 is positioned in the annular groove 6e, the groove walls on the two sides of the annular groove 6e respectively abut against the two sides of the rotating disc 5, the annular groove 6e partially or completely penetrates through and the rotating disc 5 can rotate relative to the mounting box 6, and a protruding part 5d capable of triggering the on-off switch 4 is arranged on the penetrating part of the annular groove 6e.
In this embodiment, as in the case of the brake lining wear warning device mentioned in the background art, the wear indicator further comprises an alarm which gives an alarm to prompt the driver to replace the friction plate in time when the on-off switch 4 is triggered. As shown in fig. 3, the side portion of the mounting box 6 is provided with a wire outlet hole 6f, the alarm can be arranged in the cab, the alarm and the on-off switch 4 are electrically connected through an electrical connection wire 8, and the electrical connection wire 8 for connection can be led out of the mounting box 6 through the wire outlet hole 6 f.
As shown in fig. 4, 5 and 8, two ends of the limiting hole 6d are respectively located at two opposite sides of the mounting box 6, the rotating disc 5 comprises a disc body 5a, a non-circular connecting hole 5a1 is arranged at the center of the disc body 5a, the cam shaft 2 extends into the limiting hole 6d, the rotating disc 5 is sleeved on the cam shaft 2 through the connecting hole 5a1, and the connecting hole 5a1 is non-circular, so that the rotating disc 5 and the cam shaft 2 are circumferentially fixed, and therefore, the cam shaft 2 can drive the rotating disc 5 to synchronously rotate when a braking gap is generated. In this embodiment, the connection hole 5a1 is a splined hole, that is, it means that the rotating disc 5 is actually spline-engaged with the camshaft 2, and since the camshaft 2 and the worm wheel 3 are spline-engaged in the existing adjusting arm, spline-engaging the camshaft 2 with the rotating disc 5 is the simplest for processing the camshaft 2, and only the spline on the existing camshaft 2 needs to be elongated.
As shown in fig. 4 and 8, the design principle of the wear indicator in this embodiment is as follows: when the automatic adjusting arm adjusts the braking gap, the worm wheel 3 in the shell 1 can rotate, the worm wheel 3 can drive the cam shaft 2 matched with the worm wheel 3 to rotate by a certain angle after rotating, and as the rotating disc 5 is connected to the outer side of the cam shaft 2, after the cam shaft 2 rotates by a certain angle, the protruding part 5d on the rotating disc 5 also rotates by the same angle. According to this principle, the maximum angle value by which the camshaft 2 rotates can be calculated in advance, and the relative position between the projection 5d on the rotating disk 5 and the on-off switch 4 in the initial state can be set according to the maximum angle value, so that the triggering member just triggers the on-off switch 4 when the camshaft 2 rotates to the maximum angle.
As shown in fig. 1, 2 and 3, since the rotating disc 5 is in spline fit with the cam shaft 2, in order to avoid the situation that the external spline teeth of the cam shaft 2 cannot be completely aligned with the connection holes 5a1 on the rotating disc 5 and cannot be assembled when the cam shaft 2 is inserted into the mounting box 6 after the mounting box 6 is connected to the housing 1, it is necessary to provide an arc-shaped adjusting hole 6g on the mounting box 6, and support the mounting box 6 and the housing 1 by a pin shaft 7 penetrating through the arc-shaped adjusting hole 6g and penetrating into the housing 1. The pin shaft 7 sequentially comprises a head 7a, a thread section 7b and a polished rod section 7c, wherein the head 7a is propped against one side of the mounting box 6 opposite to the shell 1, a lock nut 9 is arranged on one side of the mounting box 6 opposite to the shell 1, the thread section 7b penetrates through the arc-shaped adjusting hole 6g and is in threaded connection with the lock nut 9, a positioning hole 1a is formed in the shell 1, the polished rod section 7c is inserted into the positioning hole 1a, a shaft elastic check ring is arranged on the camshaft 2, and the shaft elastic check ring is propped against the rotating disc 5.
Through setting up round pin axle 7 into head 7a, screw thread section 7b and polished rod section 7c, head 7a supports and leans on the mounting box 6 and the side that casing 1 is opposite, screw thread section 7b passes arc regulation hole 6g and with lock nut 9 threaded connection, press from both sides between head 7a and lock nut 9 through mounting box 6 so that round pin axle 7 can not deviate from in the arc regulation hole 6g, polished rod section 7c on the round pin axle 7 inserts in the locating hole 1a on casing 1 simultaneously, polished rod section 7c only plays the supporting role of mounting box 6 when the swing, at this moment mounting box 6 and casing 1 do not form fixedly, there is the problem that mounting box 6 and casing 1 are disconnected. Then, by providing the circlip for shaft on the cam shaft 2, the turntable 5 is stopped by the circlip for shaft acting on the turntable 5, thereby solving the problem of the detachment of the housing 1 from the mounting box 6. In this way, on the one hand, the problem of fixing the mounting box 6 to the housing 1 when not swung is solved, and on the other hand, the mounting box 6 can be prevented from being torn.
As shown in fig. 5 and 6, a movable cavity 6c is provided in the mounting box 6, the on-off switch 4 is fixed in the movable cavity 6c, the annular groove 6e communicates the movable cavity 6c with the limit hole 6d, the protruding portion 5d is located in the movable cavity 6c, and the on-off switch 4 is provided with a trigger portion 4a. The mounting case 6 includes an inner lid 6a and a case 6b, and the inner lid 6a and the case 6b are fixed by welding. The inner cover 6a is located between the shell 1 and the box body 6b, one port of the limiting hole 6d is located on the inner cover 6a, a movable cavity 6c and a limiting hole 6d are formed between the inner cover 6a and the box body 6b, the on-off switch 4 is fixed in the movable cavity 6c, a mounting hole 6b1 is formed in one side, opposite to the inner cover 6a, of the box body 6b, a protruding mounting column 4b is arranged on one side, opposite to the box body 6b, of the on-off switch 4, the mounting column 4b is inserted into the mounting hole 6b1, a protruding support column 6a2 is arranged on one side, opposite to the box body 6b, of the inner cover 6a, of the inner cover 6b, and the support column 6a2 is propped against one side, opposite to the inner cover 6a, of the on-off switch 4.
As shown in fig. 5 and 10, the rotating disc 5 further includes a supporting portion 5b protruding from an outer edge of the disc 5a toward one side of the disc 5a and a flange 5c protruding from an outer side wall of the supporting portion 5b, the inner cover 6a has an annular flange one 6a1 on a side opposite to the case 6b, the case 6b has an annular flange two 6b2 on a side opposite to the inner cover 6a, inner walls of the annular flange one 6a1 and the annular flange two 6b2 are both walls of the limiting hole 6d, and an annular groove 6e is formed between the annular flange one 6a1 and the annular flange two 6b 2. The outer side wall of the supporting part 5b is abutted against the inner side wall of the annular flange one 6b2, and the limiting hole 6d forms radial limit on the rotating disc 5 through the cooperation of the inner side wall of the annular flange one 6b2 and the supporting part 5 b. The flange 5c is located in the annular groove 6e, the protruding portion 5d is arranged on the outer side of the flange 5c, the annular flange 1 abuts against one side of the flange 5c, the annular flange 2 abuts against the other side of the flange 5c, and therefore the flange 5c is clamped between the annular flange 6a1 and the annular flange 6b2, and axial limiting of the rotating disc 5 is achieved. In this embodiment, the rotating disc 5 is of an integral structure and is formed by stamping, so that the disc body 5a, the supporting portion 5b, the flange 5c and the protruding portion 5d can rotate synchronously; the annular flange I6 a1 and the inner cover 6a are of an integral structure, the annular flange II 6b2 and the box body 6b are of an integral structure, the inner diameter of the annular flange I6 a1 is larger than that of the annular flange II 6b2, and the annular flange I6 a1 and the annular flange II 6b2 respectively abut against two sides of the flanging 5c, so that the inner diameter of the annular flange I6 a1 is set to be larger than that of the annular flange II 6b2, the contact area of groove walls at two sides of the rotating disc 5 and the annular groove 6e is larger, and the rotation is more stable.
When the rotary disc 5 is assembled, the disc body 5a and the supporting part 5b of the rotary disc 5 are positioned in the limiting hole 6d, the flange 5c of the rotary disc 5 is abutted against the annular flange one 6a1 of the inner cover 6a, then the box body 6b is connected to the inner cover 6a, the flange 5c of the rotary disc 5 is clamped between the annular flange two 6b2 of the box body 6b and the annular flange one 6a1 of the inner cover 6a, and meanwhile, the outer side wall of the supporting part 5b of the rotary disc 5 is abutted against the wall of the limiting hole 6 d. Through this setting, on the one hand make the rolling disc 5 can carry out free rotation and cooperate with on-off switch 4 for mounting box 6, on the other hand can make rolling disc 5 can not appear radial float and make its cooperation stability with on-off switch 4 influenced for mounting box 6 again.
As shown in fig. 9, the on-off switch 4 is provided with a trigger portion 4a, the on-off switch 4 is a push button type micro switch, the trigger portion 4a is a trigger button on the push button type micro switch, the protruding portion 5d protrudes out of the outer side wall of the flange 5c, the protruding portion 5d and the flange 5c are of an integrated structure, the outer side wall of the flange 5c is provided with a protruding slice, and the protruding portion 5d is formed by bending the slice to one side of the flange 5 c. The protruding portion 5d comprises a matching section 5d2 and a connecting section 5d1 connecting the matching section 5d2 with the outer side wall of the flanging 5c, wherein the connecting section 5d1 protrudes from the outer side wall of the flanging 5c and bends towards one side of the flanging 5c, and two sides of the matching section 5d2 extend out of two sides of the connecting section 5d1 and bend inwards to enable the matching section 5d2 to be in an outwards convex shape. The on-off switch 4 may be a dome-type micro-switch or a proximity switch, in addition to a push-button micro-switch, and when the proximity switch is used as the on-off switch 4, the trigger portion 4a is a sensing head on the proximity switch, so long as the trigger portion can trigger the on-off switch 4 mechanically or in a signal sensing manner after the protrusion portion 5d rotates by a set angle.
The adoption of the push-button micro switch for the on-off switch 4 means that the trigger button of the push-button micro switch is used as the trigger part 4a of the on-off switch 4, but since the protruding part 5d does not press the trigger button from the front, but contacts and presses from the side in the rotating process of the rotating disc 5, the trigger button has a certain height, so that in order to enable the trigger button to be pressed down smoothly, two sides of the matching section 5d2 extend out of two sides of the connecting section 5d1 and bend inwards to enable the matching section 5d2 to be in an outward convex shape during processing, and thus the trigger button can be pressed down smoothly in the rotating process of the rotating disc 5 by contacting the inwards bent part of the matching section 5d2 with the trigger button.
The wear indicator in this embodiment is formed by fixing the on-off switch 4 in the movable cavity 6c formed between the inner cover 6a and the box body 6b, the protrusion 5d is disposed on the outer edge of the rotating disc 5, and the outer edge of the rotating disc 5 is clamped between the box body 6b and the inner cover 6a and is located in the movable cavity 6c, so that the protrusion 5d is located in the movable cavity 6c, which means that the cooperation between the protrusion 5d and the on-off switch 4 is completely performed in the movable cavity 6c, thus eliminating the possibility that other structures of the adjusting arm accidentally trigger the on-off switch 4, and meanwhile, since the rotating disc 5 is directly fixed on the cam shaft 2 and is directly driven to rotate by the cam shaft 2, compared with the prior art that the rotating disc 5 and the cam shaft 2 are driven by friction force, the phenomenon of skidding does not occur between the rotating disc 5 and the cam shaft 2, so that the alarm accuracy of the whole wear indicator is well ensured.
In addition, because radial limit is formed between the rotating disc 5 and the limit hole 6d, radial play of the rotating disc 5 cannot be generated in the rotating process, and meanwhile, because the rotating disc 5 is limited between the groove walls at the two sides of the annular groove 6e, axial play of the rotating disc 5 cannot be generated in the rotating process, and the rotating disc 5 can be stably positioned on the mounting box 6 while rotating through combination of radial limit and axial limit, so that the rotating stability of the rotating disc 5 is ensured, and the matching precision of the protruding part 5d and the on-off switch 4 in the rotating process of the rotating disc 5 is well improved; in addition, since the rotating disc 5 is supported by the limiting hole 6d and the annular groove 6e, the groove width of the annular groove 6e is generally limited, other parts are difficult to penetrate into the annular groove 6e even if the other parts extend into the limiting hole 6d except for a disc-shaped structure similar to the rotating disc 5, and the other parts cannot penetrate into the annular groove 6e basically when the outer edge of the rotating disc 5 is arranged in the annular groove 6e, the possibility that the on-off switch 4 is triggered by other parts is avoided, and the working precision of the wear indicator is well ensured.
Meanwhile, the rotating disc 5 and the on-off switch 4 are positioned on the mounting box 6, so that the positions of the protruding part 5d on the rotating disc 5 and the on-off switch 4 can be set before the mounting box 6 is connected to the shell 1, whether interference of other structures of the adjusting arm can be caused during matching is not needed to be considered, matching requirements are well reduced, namely, the rotating disc 5 and the on-off switch 4 are matched when the mounting box 6 is connected to the shell 1, and only when the mounting box 6 is connected to the shell 1, the camshaft 2 is inserted into the limiting hole 6d, and the rotating disc 5 is enabled to be sleeved on the camshaft 2 to form circumferential fixation. And also because the rotating disc 5 and the on-off switch 4 are positioned in the mounting box 6, the wear indicator has wider applicability and higher integration level, and can be integrally connected and detached, so long as the mounting box 6 is connected to the shell 1 or detached from the shell 1.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The wear indicator for the adjusting arm comprises an on-off switch (4) for control and is characterized by further comprising a mounting box (6) capable of being connected to the side wall of the adjusting arm and a rotating disc (5) capable of being connected with the adjusting arm and controlled by the adjusting arm, wherein the on-off switch (4) is arranged in the mounting box (6), the mounting box (6) is provided with a limiting hole (6 d), the rotating disc (5) is arranged in the limiting hole (6 d) and forms radial limiting with the limiting hole (6 d), a non-circular connecting hole (5 a 1) for being connected with a cam shaft (2) and forming circumferential fixing is arranged in the center of the rotating disc (5), an annular groove (6 e) is formed in the inner wall of the limiting hole (6 d), the outer edge of the rotating disc (5) is arranged in the annular groove (6 e) and is limited between two side groove walls of the annular groove (6 e), the annular groove (6 e) is partially or completely penetrated, the rotating disc (5) can rotate relative to the mounting box (6), and the on-off switch (4) can be triggered by the rotating disc (5) at the part (6 e) which penetrates through the annular groove; the mounting box (6) comprises a box body (6 b) provided with an annular flange II (6 b 2) and an inner cover (6 a) connected with the box body (6 b) and provided with an annular flange I (6 a 1), wherein the inner walls of the annular flange I (6 a 1) and the annular flange II (6 b 2) are the hole walls of the limiting holes (6 d), the annular groove (6 e) is formed between the annular flange I (6 a 1) and the annular flange II (6 b 2), a triggering part (4 a) is arranged on the on-off switch (4), the triggering part (4 a) is located on the motion track of the protruding part (5 d), and the protruding part (5 d) can trigger the on-off switch (4) when being close to the triggering part (4 a) or contacting the triggering part (4 a) along with the rotation of the rotating disc (5).
2. The wear indicator for an adjusting arm according to claim 1, wherein the rotating disc (5) is provided with a ring-shaped supporting portion (5 b), the supporting portion (5 b) is located in the limiting hole (6 d), and the outer side wall of the supporting portion (5 b) abuts against the wall of the limiting hole (6 d).
3. The wear indicator for an adjusting arm according to claim 2, wherein the rotating disc (5) further comprises a disc body (5 a) and a flange (5 c), the supporting portion (5 b) is arranged on one side of the disc body (5 a) and the flange (5 c) is arranged on the outer side of the supporting portion (5 b), the flange (5 c) is limited in the annular groove (6 e), the connecting hole (5 a 1) is arranged at the center of the disc body (5 a), and one port of the limiting hole (6 d) is arranged on one side of the mounting box (6).
4. A wear indicator for an adjustment arm according to claim 1 or 2 or 3, characterized in that the annular flange one (6 a 1) abuts against one side of the rotating disc (5) and the annular flange two (6 b 2) abuts against the other side of the rotating disc (5).
5. A wear indicator for an adjusting arm according to claim 3, wherein the on-off switch (4) is a push-button type micro switch, the protruding portion (5 d) comprises a mating section (5 d 2) and a connecting section (5 d 1) connecting the mating section (5 d 2) with the outer side wall of the flange (5 c), the connecting section (5 d 1) protrudes from the outer side wall of the flange (5 c) and bends towards one side of the flange (5 c), and two sides of the mating section (5 d 2) protrude out of two sides of the connecting section (5 d 1) and bend inwards to make the mating section (5 d 2) convex outwards.
6. A wear indicator for an adjustment arm according to claim 3, characterized in that the connecting hole (5 a 1) is a splined hole and that one side of the mounting box (6) is provided with an arc-shaped adjustment hole (6 g).
7. The brake clearance adjusting arm comprises a shell and a cam shaft, wherein one end of the cam shaft is inserted into the shell and can rotate when a brake clearance is generated, the wear indicator comprises an on-off switch (4) used for controlling display, and the brake clearance adjusting arm is characterized in that the wear indicator further comprises a rotating disc (5) and a mounting box (6), the mounting box (6) is connected to one side of the shell, the on-off switch (4) is arranged in the mounting box (6), the mounting box (6) is provided with a limiting hole (6 d), the rotating disc (5) is positioned in the limiting hole (6 d) and forms radial limit with the limiting hole (6 d), an annular groove (6 e) is formed in the inner wall of the limiting hole (6 d), the outer edge of the rotating disc (5) is positioned in the annular groove (6 e) and is limited between two side groove walls of the annular groove (6 e), the rotating disc (5) penetrates partially or completely, the cam shaft stretches into the limiting hole (6 d), the cam shaft stretches into the limiting hole (5) and is in a sleeved mode, and the cam shaft penetrates through the annular groove (5) in a circumferential direction, and the annular groove (5) is fixed on the cam shaft and can extend into the annular groove (6 d), and can trigger the on the cam shaft; the mounting box (6) comprises a box body (6 b) provided with an annular flange II (6 b 2) and an inner cover (6 a) connected with the box body (6 b) and provided with an annular flange I (6 a 1), wherein the inner walls of the annular flange I (6 a 1) and the annular flange II (6 b 2) are the hole walls of the limiting holes (6 d), the annular groove (6 e) is formed between the annular flange I (6 a 1) and the annular flange II (6 b 2), a triggering part (4 a) is arranged on the on-off switch (4), the triggering part (4 a) is located on the motion track of the protruding part (5 d), and the protruding part (5 d) can trigger the on-off switch (4) when being close to the triggering part (4 a) or contacting the triggering part (4 a) along with the rotation of the rotating disc (5).
8. The brake clearance adjusting arm according to claim 7, wherein a worm wheel (3) capable of rotating relative to the housing (1) is provided in the housing (1), the cam shaft (2) is inserted into the worm wheel (3) and the worm wheel (3) is spline-fitted with the cam shaft (2), and the cam shaft (2) is spline-fitted with the rotary disk (5).
9. The brake clearance adjusting arm according to claim 8, wherein the mounting box (6) is provided with an arc-shaped adjusting hole (6 g), a pin shaft (7) is arranged in the arc-shaped adjusting hole (6 g), and one end of the pin shaft (7) penetrates into the shell (1).
10. The brake clearance adjusting arm according to claim 9, wherein the pin shaft (7) sequentially comprises a head portion (7 a), a thread section (7 b) and a polished rod section (7 c), the head portion (7 a) is abutted against one side, opposite to the shell (1), of the mounting box (6), a lock nut (9) is arranged on one side, opposite to the shell (1), of the mounting box (6), the thread section (7 b) penetrates through the arc-shaped adjusting hole (6 g) and is in threaded connection with the lock nut (9), a positioning hole (1 a) is formed in the shell (1), the polished rod section (7 c) is inserted into the positioning hole (1 a), a shaft elastic check ring is arranged on the cam shaft (2), and the shaft elastic check ring is abutted against the rotating disc (5).
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| CN201710814205.7A CN107366698B (en) | 2017-09-11 | 2017-09-11 | Wear indicator for adjusting arm and brake clearance adjusting arm |
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| CN201710814205.7A CN107366698B (en) | 2017-09-11 | 2017-09-11 | Wear indicator for adjusting arm and brake clearance adjusting arm |
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| CN107366698A CN107366698A (en) | 2017-11-21 |
| CN107366698B true CN107366698B (en) | 2023-10-13 |
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| CN201710814205.7A Active CN107366698B (en) | 2017-09-11 | 2017-09-11 | Wear indicator for adjusting arm and brake clearance adjusting arm |
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| CN108006116B (en) * | 2017-12-26 | 2023-12-05 | 隆中控股集团股份有限公司 | Angle sensor for adjusting arm |
| CN109764073A (en) * | 2019-03-28 | 2019-05-17 | 山西峰润众盛汽车配件制造有限公司 | A kind of self-regulated arm increases the device of warning function |
| CN109838486A (en) * | 2019-03-28 | 2019-06-04 | 山西峰润众盛汽车配件制造有限公司 | A kind of arm for automatically regulating clearance of brake alarmed |
| CN109798309A (en) * | 2019-03-28 | 2019-05-24 | 山西峰润众盛汽车配件制造有限公司 | A kind of warning device of arm for automatically regulating clearance of brake |
| CN110159681A (en) * | 2019-04-25 | 2019-08-23 | 瑞安市纳德睿电子科技有限公司 | A kind of adjustment arm angle sensor with brake alarm device for vehicle |
| CN110469606B (en) * | 2019-07-16 | 2021-06-29 | 济南金麒麟刹车系统有限公司 | Drum type heavy piece abrasion monitoring sensor, alarm system and abrasion monitoring method thereof |
| CN113623344B (en) | 2020-05-09 | 2023-02-21 | 威伯科印度有限公司 | Automatic slack adjuster, brake system and wheel set for vehicle |
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Address after: 317600 ridge foot of Yucheng street in Yuhuan, Zhejiang Applicant after: LONGZHONG HOLDING GROUP CO.,LTD. Address before: 317600 Taizhou City, Zhejiang City, Yuhuan City North Industrial Area Applicant before: LONGZHONG HOLDING GROUP Co.,Ltd. |
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