A self-adjusting arm for warning excessive wear of brake lining

Abstract

The present invention is a self-adjusting arm for alarming excessive wear of brake linings, comprising an adjusting arm body, a micro-motion device and an alarm device. The internal structure of the adjusting arm body is basically unchanged, and only a correction point and a trigger point are added to the end face of the worm gear, and a micro-motion device is added to the pressure plate to be connected with the alarm device. The advantages of the present invention are: simple structure, easy operation, automatic alarm when the brake lining is worn to a certain extent, and timely reminder to replace the brake lining.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle brake systems, and in particular to a self-adjusting arm for alarming excessive wear of a brake lining. Background Art

[0002] There should be a normal and reasonable minimum gap between the brake lining and the brake hub in the automobile brake, that is, the brake clearance, to ensure the best braking effect of the brake. However, this gap will gradually increase due to the use of the brake and the wear of the lining. If the clearance of the four wheels cannot be kept equal, it will lead to braking lag, deviation, and excessive braking distance, which will bring unsafe hidden dangers to driving and even cause traffic accidents. Therefore, the position of the brake lining should be adjusted in time to keep the normal gap between it and the brake hub.

[0003] To solve this problem, various automatic adjustment arms have been designed. The function of these automatic adjustment arms is to automatically compensate the enlarged shoe-drum gap in an equal amount when the car's brake linings are worn, so that the car always has good braking performance. However, as the brake linings continue to wear, the compensation is also constantly going on. The compensation will not stop until the linings are completely damaged. Only manual inspection can discover the need for replacement. If it is not discovered in time, it will cause damage to the braking system and cause an accident. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a brake lining excessive wear alarm self-adjusting arm, which can automatically alarm when the brake lining is excessively worn.

[0005] The technical solution of the present invention is: a brake lining excessive wear alarm self-adjusting arm, comprising: an adjusting arm body, the adjusting arm body comprising a housing, a worm wheel, a worm, a ratchet assembly, a pawl assembly, a connecting rod mechanism, a connecting pipe, and a pressure plate, the worm wheel is provided with worm wheel teeth, the worm is provided with a spiral groove, the worm wheel teeth are meshed with the spiral groove, the worm is connected to the ratchet assembly, the pawl assembly is connected to the ratchet assembly, the ratchet assembly is connected to the connecting rod mechanism, the connecting pipe is connected to the connecting rod mechanism, the worm wheel, worm, ratchet assembly, pawl assembly, and connecting rod mechanism are in the housing, the pressure plate is fixed to one side of the housing by screws, opposite to the end face of the worm wheel; it also includes a micro-motion device and an alarm device,

[0006] The pressing plate is a circular ring, and a through hole is provided on the pressing plate, and the through hole is a cylindrical through hole that passes through the pressing plate; the central axis of the pressing plate and the worm wheel axis of the worm wheel are on the same straight line;

[0007] A correction part and a trigger part are provided on the end surface of the worm wheel on the side opposite to the pressure plate, the correction part is a protrusion, the trigger part is a groove, the correction part and the trigger part are at the same distance from the axis of the worm wheel, and the angle formed by the correction part and the trigger part to the axis of the worm wheel corresponds to the thickness of the effective wear of the brake lining;

[0008] The bottom radius of the through hole is equal to the cross-sectional length of the triggering point;

[0009] The micro-motion device comprises a bracket, a micro-switch, a first base, a trigger plate, a second base, and a touch rod, the lower end of the bracket is fixedly connected to the outer side of the pressure plate, the bracket is a rectangular parallelepiped with an open upper end, a notch is provided on the right side of the bracket, a round hole is provided on the side of the bracket, the micro-switch is fixed to the bottom of the bracket by screws, the first base is fixedly connected to the upper left end of the bracket, the left end of the trigger plate is supported on the first base, the second base is fixedly connected above the bracket, the middle part of the trigger plate is rotatably connected to the second base, the upper end of the touch rod is welded to the lower right end of the trigger plate; the lower end of the touch rod passes through the through hole and slides on the end surface of the worm gear provided with the correction part and the trigger part; the micro-switch is connected to the alarm device through a wire, and the alarm device is connected to a power supply through a wire;

[0010] The pressing plate and the worm gear are connected via a sealing body;

[0011] Furthermore, the protrusion is an arc-shaped protrusion, and the groove is an arc-shaped groove;

[0012] Furthermore, the sealing body between the pressing plate and the worm gear is an O-type rubber sealing ring;

[0013] Furthermore, the alarm device is an alarm light or a sound generator;

[0014] Furthermore, the lower end of the touch rod is a spherical arc surface;

[0015] Furthermore, the micro-motion device is provided with a protective cover, and the protective cover is mounted on the pressing plate by screws;

[0016] Furthermore, a wear-resistant layer is provided at the lowermost end of the touch rod.

[0017] The beneficial effects of the present invention are: simple structure, easy operation, basically no change to the internal structure of the adjusting arm body, only adding a correction point and a trigger point on the end face of the worm gear, adding a micro-motion device on the pressure plate, connected with the alarm device, and deducing the wear degree of the brake lining through the rotation angle of the worm gear. When the brake lining is worn to a certain extent, an alarm is automatically sounded, and a reminder is given in time to replace the brake lining, so as to prevent the brake lining from being damaged and causing accidents due to excessive wear of the brake lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a brake lining excessive wear alarm self-adjusting arm according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the pressing plate in an embodiment of the present invention.

[0020] Figure 3 Schematic diagram of the structure of the worm gear in an embodiment of the present invention.

[0021] Figure 4 It is a front view of the worm gear in the embodiment of the present invention.

[0022] Figure 5 Schematic diagram of the installation of the micro-motion device in the embodiment of the present invention.

[0023] Figure 6 It is a three-dimensional diagram of the bracket in the embodiment of the present invention.

[0024] In the figure: 1. Adjustment arm body, 2. Housing, 3. Worm gear, 31. Correction point, 32. Trigger point, 4. Pressure plate, 41. Through hole, 5. Screw, 6. Micro motion device, 61. Bracket, 62. Micro switch, 63. First base, 64. Trigger plate, 65. Second base, 66. Touch rod, 7. Alarm device, 8. Wire, 9. Protective cover, d1. Bottom radius of the through hole, d2. Cross-sectional length of the trigger point, A. Angle formed by the correction point and the trigger point to the worm gear axis. DETAILED DESCRIPTION

[0025] The content of the present invention is further explained below in conjunction with specific embodiments, but the embodiments are only preferred implementation modes of the present invention, so all equivalent changes made according to the features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

[0026] like Figure 1 The brake pad excessive wear alarm self-adjusting arm shown includes: an adjusting arm body 1, the adjusting arm body 1 includes a shell 2, a worm wheel 3, a worm, a ratchet assembly, a pawl assembly, a connecting rod mechanism, a connecting pipe, and a pressure plate 4. The worm wheel 3 is provided with worm gears, the worm is provided with a spiral groove, the worm gear teeth are meshed with the spiral groove, the worm is connected to the ratchet assembly, the pawl assembly is connected to the ratchet assembly, the ratchet assembly is connected to the connecting rod mechanism, the connecting pipe is connected to the connecting rod mechanism, the worm wheel 3, the worm, the ratchet assembly, the pawl assembly, and the connecting rod mechanism are in the shell 2, and the pressure plate 4 is fixed to one side of the shell 2 by screws 5, opposite to the end face of the worm wheel 3; it also includes a micro-motion device 6 and an alarm device 7.

[0027] like Figure 2The pressing plate 4 shown is a circular ring, and a through hole 41 is provided on the pressing plate 4 . The through hole 41 is a cylindrical through hole that penetrates the pressing plate 4 . The central axis of the pressing plate 4 and the worm wheel axis of the worm wheel 3 are in the same straight line.

[0028] like Figure 3 and Figure 4 As shown, a correction part 31 and a trigger part 32 are provided on the end face of the worm wheel 3 on the opposite side of the pressure plate 4. The correction part 31 is a protrusion, and the trigger part 32 is a groove. The distances from the correction part 31 and the trigger part 32 to the axis of the worm wheel are equal. The wear thickness of the brake lining is reflected by the rotation angle of the worm wheel 3. The size of the angle A formed by the correction part 31 and the trigger part 32 to the axis of the worm wheel 3 corresponds to the effective wear thickness of the brake lining, and the size of the angle can be calculated based on the effective wear thickness of the brake lining.

[0029] The bottom radius d1 of the through hole 41 is equal to the cross-sectional length d2 of the triggering portion 32 .

[0030] like Figure 5 As shown, the micro-motion device 6 includes a bracket 61, a micro-switch 62, a first base 63, a trigger plate 64, a second base 65, and a touch rod 66. The lower end of the bracket 61 is fixedly connected to the outer side of the pressure plate 4, as shown in FIG. Figure 6 As shown, the bracket 61 is a rectangular parallelepiped with an opening at the upper end, and a notch is provided on the right side of the bracket 61 so that the driving rod of the micro switch 62 contacts the pressing point when pressed down and is not stuck on the bracket 61. A round hole is provided on the side of the bracket 61 to facilitate the wire 8 of the micro switch 62 to pass through. The micro switch 62 is fixed to the bottom of the bracket 61 by screws, the first base 63 is fixedly connected to the upper left end of the bracket 61, the left end of the trigger plate 64 is supported on the first base 63, the second base 65 is fixedly connected to the upper part of the bracket 61, the middle part of the trigger plate 64 is rotatably connected to the second base 65, the upper end of the touch rod 66 is welded to the lower right end of the trigger plate 64, and the driving rod of the micro switch 62 is located directly below the trigger plate 64. The lower end of the touch rod 66 passes through the through hole 41 and slides on the end surface of the worm gear 3 provided with the correction part 31 and the trigger part 32. When the touch rod 66 slides from the correction position 31 to the trigger position 32, the rotation angle of the worm gear 3 is A, and the brake lining just reaches the maximum wear; the micro switch 62 is connected to the alarm device 7 through the wire 8, and the alarm device 7 is connected to the power supply through the wire. The alarm device 7 can be installed in the cab or other locations where it is convenient to hear or see the alarm signal.

[0031] The pressure plate 4 is connected to the worm wheel 3 via a sealing body.

[0032] In this preferred embodiment, the protrusion is an arc-shaped protrusion, and the groove is an arc-shaped groove; the sealing body between the pressure plate 4 and the worm wheel 3 is an O-type rubber sealing ring; the alarm device 7 is an alarm light or a sound generator; the lower end of the feeler rod 66 is a spherical arc surface; the micro-motion device 6 is provided with a protective cover 9, which is installed on the pressure plate 4 by screws for easy disassembly. The protective cover 9 prevents dust, chips, hard sand, etc. from damaging the micro-motion device, thereby extending the service life of the micro-motion device; the lower end of the feeler rod 66 is provided with a wear-resistant layer.

[0033] Working principle: The wear of the brake lining is proportional to the rotation angle of the worm. The worm drives the worm wheel, so the wear of the brake lining is also proportional to the rotation angle of the worm wheel. Therefore, the wear degree of the brake lining can be inferred by the angle of the worm wheel. When installing a new brake lining, adjust the lower end of the feeler rod 66 to contact the correction point 31 on the end face of the worm wheel 3, and install the brake lining excessive wear alarm self-adjusting arm at the corresponding position of the car. As the brake clearance is compensated, the worm wheel 3 rotates, the position of the feeler rod 66 is fixed, and the lower end of the feeler rod 66 slides on the end face of the worm wheel 3; as the wear of the brake lining increases, the rotation angle of the worm wheel 3 increases until the trigger point 32 rotates to the bottom of the through hole 41 of the pressure plate 4. At this time, the rotation angle of the worm wheel 3 is A, and the feeler rod 66 slides from the correction point 31 to the trigger point 32. The brake lining just reaches the maximum wear, and the feeler rod 66 falls into the groove of the trigger point 32 under the action of gravity. The right end of the trigger plate 64 then drops, pressing the driving rod of the micro switch 62 to contact the pressing point, triggering the micro switch 62. The micro switch 62 is turned on and generates a signal. The signal is transmitted to the alarm device along the wire 8, sounding an alarm to remind you to replace the brake lining to prevent accidents caused by brake failure due to excessive wear of the lining.

[0034] The invention has a simple structure and is easy to operate. A micro-motion device is added to the adjusting arm body and connected to the alarm device through a wire. When the brake lining is worn to a certain extent, an alarm is automatically given to remind the user to replace the brake lining in time, thereby preventing the brake lining from being excessively worn and causing damage to the brake system and causing accidents.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A brake lining excessive wear alarm self-adjusting arm, comprising: An adjusting arm body (1), the adjusting arm body (1) comprising a housing (2), a worm wheel (3), a worm, a ratchet assembly, a pawl assembly, a connecting rod mechanism, a connecting pipe, and a pressing plate (4); the worm wheel (3) is provided with worm gears, the worm is provided with a spiral groove, the worm gear teeth are meshed with the spiral groove, the worm is connected to the ratchet assembly, the pawl assembly is connected to the ratchet assembly, the ratchet assembly is connected to the connecting rod mechanism, the connecting pipe is connected to the connecting rod mechanism, the worm wheel (3), the worm, the ratchet assembly, the pawl assembly, and the connecting rod mechanism are inside the housing (2), the pressing plate (4) is fixed to one side of the housing (2) by a screw (5), opposite to the end face of the worm wheel (3); characterized in that it also comprises a micro-motion device (6) and an alarm device (7), The pressing plate (4) is a circular ring, and a through hole (41) is provided on the pressing plate (4), and the through hole (41) is a cylindrical through hole that passes through the pressing plate (4); the central axis of the pressing plate (4) and the worm wheel axis of the worm wheel (3) are on the same straight line; A correction part (31) and a trigger part (32) are provided on the end surface of the worm wheel (3) on the side opposite to the pressure plate (4); the correction part (31) is a protrusion, and the trigger part (32) is a groove; the distances from the correction part (31) and the trigger part (32) to the axis of the worm wheel are equal; and the size of the angle (A) formed by the correction part (31) and the trigger part (32) to the axis of the worm wheel (3) corresponds to the thickness of the effective wear of the brake lining; The bottom radius (d1) of the through hole (41) is equal to the cross-sectional length (d2) of the trigger point (32); The micro-motion device (6) comprises a bracket (61), a micro-switch (62), a first base (63), a trigger plate (64), a second base (65), and a touch rod (66); the lower end of the bracket (61) is fixedly connected to the outer side of the pressure plate (4); the bracket (61) is a rectangular parallelepiped with an open upper end; a notch is provided on the right side of the bracket (61); a round hole is provided on the side of the bracket (61); the micro-switch (62) is fixed to the bottom of the bracket (61) by screws; the first base (63) is fixedly connected to the upper left end of the bracket (61); the left end of the trigger plate (64) is supported on the first base (63); The second base (65) is fixedly connected to the upper part of the bracket (61); the middle part of the trigger plate (64) is rotatably connected to the second base (65); the upper end of the touch rod (66) is welded to the lower right end of the trigger plate (64); the driving rod of the micro switch (62) is located directly below the trigger plate (64); the lower end of the touch rod (66) passes through the through hole (41) and slides on the end surface of the worm gear (3) provided with the correction part (31) and the trigger part (32); the micro switch (62) is connected to the alarm device (7) through a wire (8), and the alarm device (7) is connected to a power source through a wire; The pressing plate (4) and the worm wheel (3) are connected via a sealing body; When the wear reaches the maximum amount, the touch rod (66) in the micro-motion device (6) falls into the groove of the triggering part (32) by gravity, and presses down the driving rod to trigger the micro-motion switch (62).

2. A brake lining excessive wear alarm self-adjusting arm according to claim 1, characterized in that: The protrusion is an arc-shaped protrusion, and the groove is an arc-shaped groove.

3. The brake lining excessive wear alarm self-adjusting arm according to claim 1, characterized in that: The sealing body between the pressing plate (4) and the worm wheel (3) is an O-type rubber sealing ring.

4. The brake lining excessive wear alarm self-adjusting arm according to claim 1, characterized in that: The alarm device (7) is an alarm light or a sound generator.

5. The brake lining excessive wear alarm self-adjusting arm according to claim 1, characterized in that: The lower end of the touch rod (66) is a spherical arc surface.

6. The brake lining excessive wear alarm self-adjusting arm according to claim 1, characterized in that: The micro-motion device (6) is provided with a protective cover (9), and the protective cover (9) is mounted on the pressing plate (4) by means of screws.

7. The brake lining excessive wear warning self-adjusting arm according to claim 1, characterized in that: The lowermost end of the feeler rod (66) is provided with a wear-resistant layer.

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