JPH1113800A - Mounting structure of brake wear detecting probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the removal of a wear detecting probe alone. SOLUTION: In mounting, a wear detecting probe 10, a spring member 30, and retainer 20 are inserted in a mounting hole 45, the spring member 30 is elastically deformed between a stopper 13 and the retainer 20, a stop part 21 is engaged with a support hole (a support part) 50, and this way holds a mounting state. In removal, by pushing in the retainer 20 by grasping an operation part, the spring member 30 is elastically contracted and the lock part 21 is removed from the support hole 50, and the retainer 20, the spring member 30, and the wear detecting probe 10 are pulled out from a mounting hole 45. Namely, the wear detecting probe 10 alone is removable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for mounting a brake wear detecting probe.

[0002]

2. Description of the Related Art A wear detecting probe for detecting that the wear degree of a brake pad of an automobile has reached a use limit has been developed. As a structure for mounting the wear detecting probe, one disclosed in Japanese Utility Model Laid-Open No. 55-45070 is known. As shown in FIG. 7, a mounting hole 2a is formed in the mounting plate 2 to which the brake pad 1 is fixed, and a cylindrical collar body 3 is fitted in the mounting hole 2a in advance. This color body 3
A locking piece 3a is formed to be cut and raised inward on the inner peripheral surface of. On the other hand, a sleeve 5
Is fitted, and can be inserted into the collar body 3 in this state. Then, when the wear detecting probe 4 is inserted into the collar body 3, the locking piece 3a of the collar body 3
Engages with the flange portion 5 a of the sleeve 5, whereby the wear detection probe 4 is prevented from coming off with respect to the collar body 3, and is thereby fixed to the mounting plate 2.

[0003]

However, the locking piece 3a
In the above-described configuration in which the wear detection probe 4 is prevented from coming off, once the wear detection probe 4 is fixed to the mounting plate 2, it is extremely difficult to remove it. Therefore, even in the case where the wear detection probe 4 needs to be replaced, the wear detection probe 4 has to be replaced integrally with the brake pad or the like, instead of detaching the probe alone. The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily remove a wear detection probe.

[0004]

According to the first aspect of the present invention, there is provided a mounting structure of a wear detecting probe for detecting whether or not a wear degree of a brake piece provided to be able to contact a rotor has reached a use limit. A mounting hole provided in the support member for fixing the braking piece, and allowing the abrasion detection probe to be inserted; and a mounting hole provided in the abrasion detection probe and the mounting hole and engaging with each other to form the mounting hole. A stopper for restricting further insertion displacement of the abrasion detection probe properly inserted into the receiving hole, a receiving portion provided on an insertion opening side of the mounting hole, and insertion / removal to / from the mounting hole is enabled; A retainer provided with a locking portion capable of engaging and disengaging from the inside of the portion, and the retainer and the wear detection probe being elastically deformed and mounted between the retainer and the wear detection probe, whereby the locking portion and Receiving part And a configuration in which a spring member for holding the engaged state and the engaged state of the stopper together.

According to a second aspect of the present invention, in the first aspect of the present invention, the retainer includes an operation of inserting and removing the retainer from the mounting hole and an operation of engaging and disengaging the locking portion from the receiving portion. A configuration is provided in which an operation unit is provided. According to a third aspect of the present invention, in the first or second aspect of the present invention, the wear detection probe is provided with a temporary holding portion capable of temporarily holding the spring member and the retainer by the elastic force of the spring member. The configuration was adopted.

[0006]

Actions and effects of the present invention

<Invention of Claim 1> When attaching the wear detecting probe to the support member, the wear detecting probe, the spring member, and the retainer are inserted into the mounting holes, and the spring member is elastically deformed between the wear detecting probe and the retainer. The retaining portion and the receiving portion are held in the engaged state by the elastic restoring force of the spring member, and the removal of the retainer from the mounting hole is regulated. Is held. When removing the wear detection probe, the retainer is displaced so as to elastically compress the spring member to release the engagement between the locking portion and the receiving portion, and the retainer, the spring member, and the wear detection probe are removed from the mounting holes. I just need. in this way,
The wear detection probe can be easily removed by itself.

<Invention of claim 2> By gripping the operation part, the work of inserting and removing the retainer from the mounting hole,
Work of engagement and disengagement of the locking portion with respect to the receiving portion can be performed. That is, the operability is improved by providing the operation unit. <Invention of claim 3> Since the retainer and the spring member are assembled to the wear detecting probe in a temporarily held state, these parts can be inserted into the mounting hole at a time, and the workability is excellent. I have.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The wear detection probe 10 according to the present embodiment includes a holder 1 made of a heat-resistant resin material.
1, a detection wire 12 is built in by insert molding, and at the front end of the holder 11, the detection wire 12 is folded back into a U-shape, which is a disconnectable portion 12A.
The detection wire 12 is pulled out from the rear end face of the holder 11,
It is connected to a disconnection detection circuit (not shown). Such a wear detecting probe 10 performs braking by clamping both surfaces of a disk-shaped rotor (not shown) that rotates integrally with a wheel with a brake lining material (brake piece that is a constituent element of the present invention) 40. Applied to vehicle disc brakes. That is, the wear detection probe 10 is attached to a support plate (a support member which is a constituent element of the present invention) 41 to which the brake lining material 40 is fixed (a detailed attachment structure will be described later), and an accommodation hole 42 for the brake lining material 40 is provided. The front end of the holder 11 faces. When the wear of the brake lining material 40 progresses and its thickness is reduced to a predetermined size, the front end of the holder 11 comes into contact with the rotor and wears, and further, the disconnectable portion 12A of the detection electric wire 12 is worn and disconnected. . When this disconnection is detected by the disconnection detection circuit, a warning lamp (not shown) for notifying that the wear of the brake lining material 40 has reached the usage limit is turned on.

Next, the mounting structure of the wear detecting probe 10 will be described. The holder 11 constituting the wear detection probe 10 has a columnar shape that is long in the front-rear direction as a whole, and a concentric circular flange-shaped stopper 13 is formed at a substantially central portion in the lengthwise direction. The rear end portion of the holder 11 is a knob portion 14 having a thick plate-like shape in which both left and right side portions are cut off and flattened. A retainer fitting portion 15 is formed between the knob portion 14 and the stopper 13 by cutting both left and right side portions into a flat surface similarly to the knob portion 14. A temporary holding portion 16 having a disc shape is provided between the retainer fitting portion 15 and the knob portion 14. The detection wire 12 is drawn out from the rear end face of the knob 14.

On the other hand, a female screw hole 43 is formed through the support plate 41, and a cylindrical member 44 is screwed and fixed in the female screw hole 43. The inner periphery of the cylindrical member 44 is a mounting hole 45 concentric with the accommodation hole 42. At the front end side (left side in FIGS. 2 to 4) of the mounting hole 45, a stopper 46 whose diameter is reduced in a step shape is formed, and the stopper 13 of the wear detecting probe 10 is brought into contact with the stopper 46 from behind. It has become. Further, the rear end side of the mounting hole 45 is provided with a concentric circular retainer accommodating portion 4 having a stepped diameter.
7 are formed. A ring-shaped receiving member 48 is concentrically fixed to the rear end surface of the cylindrical member 44 along the opening edge of the mounting hole 45 by welding. The inner peripheral edge of the receiving member 48 protrudes inside the retainer accommodating portion 47, and the opening of the receiving member 48 is formed by the wear detecting probe 10 and the retainer 2.
0 and an insertion port 49 for inserting the spring member 30. The distance between the stopper 46 and the receiving member 48 in the front-rear direction of the mounting hole 45 is set to be equal to or slightly shorter than the distance from the stopper 13 of the wear detecting probe 10 to the temporary holding portion 16. I have. The receiving member 48 includes the outside of the cylindrical member 44 and the retainer housing 47.
Are formed at an angular interval of 180 °. Similarly, two relief portions 51 are formed in the receiving member 48 by notching the inner peripheral edge thereof, and the relief portions 51 are formed.
Is 90 ° with respect to the receiving hole 50 in the present embodiment.

When mounting the wear detecting probe 10 in the mounting hole 45, the retainer 20 and the spring member 30 are used. The retainer 20 is formed by bending a metal plate material punched into a predetermined shape, and has a substantially disk shape as a whole. The outer diameter of the retainer 20 is set to be substantially the same as the outer diameter of the stopper 13 of the wear detection probe 10. The outer diameter of the retainer 20 is slightly smaller than the diameter of the insertion opening 49 of the receiving member 48. A pair of left and right locking portions 21 are formed on the outer peripheral edge of the retainer 20 so as to slightly protrude outward and project rearward. The locking portions 21 are engaged with and disengaged from the receiving holes 50. Has become. The retainer 20 is formed with a cut-and-raised operating portion 22 projecting rearward from the upper end thereof. Notch 23 formed by cutting and raising the operation unit 22
Are fitted to the retainer fitting portion 15 of the holder 11 almost tightly. The spring member 30 is formed of a compression coil spring, and the outer diameter of the coil is slightly smaller than the opening diameter of the insertion port 49. The free length of the spring member 30 in the axial direction is determined by the stopper 1 of the wear detecting probe 10.
The length is set to be longer than the distance between the third holder 3 and the temporary holding part 16.

Next, a procedure for attaching and detaching the wear detecting probe 10 according to the present embodiment will be described. When attaching the wear detection probe 10 to the support plate 41, first, the spring member 30 is fitted to the wear detection probe 10 from the rear and hits against the stopper 13, and the retainer is fitted with the spring member 30 elastically compressed. The notch 23 of the retainer 20 is fitted into the joint 15 from above, and the spring member 30 is applied to the retainer 20. Then, the retainer 20 is pressed against the temporary holding portion 16 by the elastic restoring force of the spring member 30, and the removal of the notch 23 from the retainer fitting portion 15 is regulated by the friction. Temporarily held. In this state, the operation unit 22 follows the upper surface of the knob 14. Next, the user has the operation unit 22 and the knob unit 14,
The temporarily assembled wear detection probe 10, spring member 30, and retainer 20 are collectively inserted into the mounting hole 45 (see FIG. 2). At this time, as shown in FIG. 5, the locking portion 21 protruding laterally from the retainer 20 passes through the insertion port 49 by being aligned with the escape portion 51. Thereafter, the operating portion 22 is gripped and the retainer 2 is pressed against the elasticity of the spring member 30.
0 is pushed into the inside of the mounting hole 45. Subsequently, the retainer 20 is rotated by 90 ° together with the wear detection probe 10 (see FIG. 3), and the locking portion 21 is aligned with the receiving hole 50 (see FIG. 6). Next, the retainer 20 is moved rearward according to the elastic restoring force of the spring member 30. Then, the locking portion 21 fits into the receiving hole 50 and the receiving member 48
, Thereby restricting rotation of the retainer 20 and further retreat thereof (see FIG. 4). From the above,
Installation work is completed. In this mounted state, the elastic restoring force of the spring member 30 acts on the retainer 20 to regulate the forward movement of the retainer 20, so that the locking portion 21 does not come off the receiving hole 50. In addition, the wear detection probe 10
Since the stopper 13 is kept in contact with the stopper 46 of the mounting hole 45 by the elastic restoring force of the spring member 30, the play of the support plate 41 in the front-rear direction is restricted.
Further, the rotation of the retainer 20 is restricted with respect to the support plate 41 and the cylindrical member 44. Since the retainer fitting portion 15 is fitted to the retainer 20, the floating movement of the wear detection probe 10 with respect to the support plate 41 in the rotation direction is also prevented. Be regulated.

When the wear detecting probe 10 is to be removed, the operation may be performed in the reverse order of the above-described mounting. That is, the operating portion 22 is pinched and the retainer 20 is pushed into the inside of the mounting hole 45 to release the engagement between the locking portion 21 and the receiving hole 50. Then, in the pushed state, the wear detecting probe 10
Then, the retainer 20 is rotated by 90 ° together with the locking portion 21 so as to be aligned with the escape portion 51. Then, the retainer 20 is moved rearward according to the elastic restoring force of the spring member 30 and is brought into contact with the temporary holding portion 16. Thereafter, the operating unit 22 and the knob 14 are provided, and the wear detecting probe 10 and the spring member 30 are provided.
And the retainer 20 may be collectively removed from the mounting hole 45. Thus, the removal operation is completed.

As described above, according to the mounting structure of the present embodiment, the wear detecting probe 10 can be detached from the support plate 41 by itself. The retainer 20 has an operation unit 2.
2, the workability of inserting and removing the retainer 20 from the mounting hole 45 and the operation of rotating the retainer 20 to engage and disengage the locking portion 21 with the receiving hole 50 are improved. Has become. Furthermore, in this embodiment, since the spring member 30 and the retainer 20 can be temporarily held by the abrasion detection probe 10, these components can be inserted and withdrawn from the mounting hole 45 collectively. Excellent in nature.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) In the above embodiment, the mounting hole is formed in the cylindrical member mounted on the rotor. However, according to the present invention, the mounting hole may be formed directly on the rotor. (2) In the above embodiment, the wear detection probe, the retainer, and the spring member are assembled in a temporary holding state in a state where they are not inserted into the mounting holes. May be individually assembled.

(3) In the above embodiment, the case where the mounting structure of the wear detecting probe for the brake piece of the present invention is applied to a disc brake is described. However, the present invention can also be applied to a drum brake.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wear detection probe, a spring member, and a retainer according to a first embodiment.

FIG. 2 is a sectional view showing a process of attaching and detaching a wear detecting probe to and from a mounting hole.

FIG. 3 is a cross-sectional view showing a process of attaching and detaching a wear detecting probe to and from a mounting hole.

FIG. 4 is a cross-sectional view illustrating a state in which the abrasion detection probe has been mounted on the mounting hole.

FIG. 5 is a rear view showing a process of attaching and detaching the wear detecting probe to and from the mounting hole.

FIG. 6 is a rear view showing a state in which the mounting of the wear detecting probe to the mounting hole is completed.

FIG. 7 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Wear detection probe 13 ... Stopper (of a wear detection probe) 16 ... Temporary holding part 20 ... Retainer 21 ... Locking part 22 ... Operating part 30 ... Spring member 40 ... Brake lining material (braking piece) 41 ... Support plate (support) 45) Mounting hole 46 ... Stopper (of mounting hole) 49 ... Insertion port 50 ... Receiving hole (receiving part)

Claims (3)

[Claims] 1. A mounting structure for a wear detecting probe for detecting whether or not the degree of wear of a brake piece provided to be able to contact a rotor has reached a use limit, wherein a support member for fixing the brake piece is provided. A mounting hole that is provided in the mounting hole and allows the wear detection probe to be inserted; and a mounting hole that is provided in the wear detection probe and the mounting hole and that is normally inserted into the mounting hole by engaging with each other. A stopper for restricting the above insertion displacement, a receiving portion provided on the insertion opening side of the mounting hole, and insertion / removal to / from the mounting hole is enabled; A retainer provided with a locking portion capable of performing the elastic deformation between the retainer and the abrasion detection probe, and thereby an engagement state between the locking portion and the receiving portion and the stopper. Mounting structure of the brake wear detection probe characterized in that it is constituted by a spring member for holding the engaged state of. 2. An operation unit for enabling the retainer to perform an insertion / extraction operation of the retainer with respect to the mounting hole and an engagement / disengagement operation of the locking unit with respect to the receiving unit. The mounting structure of the brake wear detecting probe according to claim 1, wherein: 3. The wear detection probe according to claim 1, wherein a temporary holding portion capable of temporarily holding the spring member and the retainer is formed by elasticity of the spring member. Mounting structure for brake wear detection probe.