JPH0453465Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a pin slide type disc brake, and particularly to a device for closing the opening of a guide hole into which a slide pin is fitted.

BACKGROUND TECHNOLOGY It has a disc rotor, a slide pin protruding from a support member parallel to the axis of the disc rotor, and a guide hole that penetrates in a direction parallel to the axis of the disc rotor. and a caliper supported by the support member so that the slide pin is slidably fitted therein so as to be movable in a direction parallel to the axis of the disk rotor, and the protruding end of the slide pin is in the guide hole. A pin slide type disc brake that can be positioned in the

In such disc brakes, a plug made of an elastic material such as rubber is usually fitted into the opening of the guide hole on the protruding end side of the slide pin, thereby blocking the opening and preventing water from entering the guide hole. The infiltration of dirt, mud, etc. is prevented. In addition, the plug is usually provided with a slit that functions as an on-off valve, and when the air pressure in the guide hole exceeds a predetermined value when assembling the caliper to the slide pin, the plug becomes elastic. The slit is opened while the guide hole is being deformed, and the pressure inside the guide hole is exhausted, so that even if the opening of the guide hole is closed with a plug, there is almost no hindrance to the caliper assembly work, etc. There is.

Problems to be Solved by the Invention However, since the plug is made of an elastic material and the slit is usually formed by punching, it is relatively difficult to form the slit stably, and the length of the slit is In some cases, the dimensions are smaller than the lower limit of manufacturing specifications, or the slits do not penetrate completely. If such a plug with a poorly formed slit is mistakenly attached to the opening of the guide hole, the air pressure in the guide hole will not be exhausted even if it exceeds the predetermined value, and the caliper will not be assembled. There were cases where workability etc. were impaired.

The present invention was developed against the background of the above-mentioned circumstances, and its purpose is to form a part that functions as an on-off valve in a relatively stable state so that when the pressure exceeds a predetermined pressure, It is an object of the present invention to provide a guide hole closing device with a simple structure that can more reliably exhaust the pressure inside the guide hole.

Means for Solving the Problems In order to achieve the above object, the present invention provides a pin slide type disc brake of the type described above, which is provided in the opening of the guide hole on the protruding end side of the slide pin. A guide hole closing device that closes an opening and allows exhaust pressure in the guide hole when the air pressure in the guide hole exceeds a predetermined value, the device comprising: (a) a thin-walled cylindrical shape; an elastic member whose one end is caused to protrude from the open end of the guide hole by being fitted into the inner peripheral surface of the opening on the slide pin protruding side of the hole with relative movement toward the base side of the slide pin being prevented; and (b) a cylindrical portion with a bottom, an outward flange provided at the open end of the cylindrical portion, and a flange provided on the outer peripheral surface of the cylindrical portion between the bottom side end surface of the cylindrical portion and the outward flange. It has a series of grooves,
(c) a lid member whose cylindrical portion is fitted into the opening of the guide hole via the elastic member, so that the outward flange is brought into contact with the protruding edge of the elastic member; It is characterized by including a stopper that prevents the cylindrical portion from being fitted into the opening of the guide hole beyond a certain limit and restricts the contact state between the outward flange of the lid member and the protruding edge of the elastic member. shall be.

In the guide hole closing device configured as described above, a thin cylindrical elastic member is provided on the inner circumferential surface of the opening of the guide hole on the slide pin protruding side to prevent relative movement of the slide pin toward the base side. When the elastic member is inserted in the state, one end of the elastic member protrudes from the open end of the guide hole, and the bottomed cylindrical part, the outward flange provided at the open end of the cylindrical part, and the outer periphery of the cylindrical part A lid member having a groove provided on a surface and connected between a bottom side end surface of the cylindrical portion and the outward flange is prevented by the stopper from entering the opening of the guide hole via the elastic member in the cylindrical portion. By being fitted until the end of the lid member is inserted, the outward flange of the lid member is brought into contact with the protruding edge of the elastic member, and the state of contact is regulated, and the inner peripheral surface of the guide hole and the outer peripheral surface of the cylindrical portion of the lid member contact each other. With the elastic member being compressed, the closing device is installed in the guide hole opening to close the guide hole opening. When the air pressure in the guide hole exceeds a predetermined value, the air pressure in the guide hole guided by the groove elastically deforms a part of the protruding end of the elastic member toward the outer circumference. An opening can be created between the protruding end edge and the outward flange, thereby allowing the pressure inside the guide hole to be exhausted.

Effects of the Invention As described above, according to the guide hole closing device of the present invention, when the cylindrical portion of the lid member is fitted into the opening of the guide hole via the elastic member, the protruding edge of the elastic member and the Since the contact state of the outward flange with the portion located around the groove is regulated by the stopper, the portion functioning as an on-off valve can be formed in a relatively stable state. As a result, when the air pressure in the guide hole exceeds a predetermined value, the pressure in the guide hole can be more reliably evacuated. Moreover, since the lid member and the elastic member constituting the guide hole closing device are each configured with a simple shape, the above effects can be obtained without complicating the structure of the guide hole closing device.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 3 is a diagram showing the main parts of a pin slide type disc brake equipped with a guide hole closing device to which the present invention is applied, in which reference numeral 10 denotes a caliper disposed straddling the outer periphery of the disc rotor 12. It is. The caliper 10 includes a cylinder part 14 into which a piston (not shown) is fitted so as to be able to protrude toward the disc rotor 12, and a cylinder part 14 that extends integrally from the cylinder part 14 and faces the cylinder part 14 with the disc rotor 12 in between. and a pair of guide arm parts 18 and 20 protruding from both sides of the cylinder part 14 in the circumferential direction of the disk rotor 12. On the other hand, a torque plate 22 is fixed to a non-rotating member (not shown), and a pair of slide pins 24, 26 are attached to this torque plate 22 in a state parallel to the axis of the disc rotor 12.
(26 shown in FIG. 4) protrudes, and the caliper 10 is supported movably in a direction parallel to the axis of the disk rotor 12 by slide pins 24 and 26 at its guide arm portions 18 and 20. ing. In this embodiment, the torque plate 22 constitutes a support member. Also, the inner side of the caliper 10, that is, the piston and the claw portion 16
A pair of pads 28 and 30 are arranged between the disc rotor 12 and the disc rotor 12.
By supplying hydraulic pressure into the cylinder portion 14 and protruding the piston, both pads 28, 3
0, the disc rotor 12 is compressed and braking is performed.

On the other hand, the protruding end of the slide pin 24 is made to protrude from a guide hole (not shown) of the guide arm 18, and there is a gap between the guide arm 18 and the base and protruding end of the slide pin 24. Dust boots 32 and 34 are each attached. As shown in FIG. 4, the other slide pin 26 includes a bolt 36 and a cylindrical member 38, and the bolt 36, which is inserted through the cylindrical member 38, is screwed onto the torque plate 22. The slide pin 26 is slidably fitted in the cylindrical member 38 into a guide hole 40 provided in the guide arm portion 20 and penetrating in a direction parallel to the axis of the disk rotor 12. The protruding end of 26 is always located inside the guide hole 40 so as not to protrude from the open end of the guide hole 40 on the side opposite to the torque plate 22 side. Therefore, in this embodiment, the slide pin 26 corresponds to the slide pin in the claims. Further, a dust boot 42 is attached between the outer circumferential surface of the cylindrical member 38 on the torque plate 22 side and the outer circumferential surface of the guide arm section 20.

As shown in FIGS. 1 to 4, the inner peripheral surface of the opening of the guide hole 40 on the side opposite to the torque plate 22 includes a bottomed cylindrical portion 44 and an open end of the cylindrical portion 44. an outward flange 46 provided on the
A thin-walled metal lid member 50 having a groove 48 provided on the outer peripheral surface of the cylindrical portion 44 in a direction substantially parallel to the axis and continuous between the bottom side end surface of the cylindrical portion 44 and the outward flange 46; A guide hole closing device 54 consisting of a rubber ring 52 having a shape is attached. That is, as shown in FIGS. 1 and 4, an annular protrusion 56 is formed at a position a predetermined distance from the opening end of the guide hole 40 and protrudes toward the inner periphery of the guide hole 40. The torque plate 22 is attached to the surface by contact with the annular projection 56.
The rubber ring 52 is fitted in a state in which relative movement toward the side (base side of the slide pin 26) is prevented, and the end of the rubber ring 52 opposite to the torque plate 22 side is connected to the guide hole 40.
It is made to protrude a predetermined distance from the open end of. Further, the cylindrical portion 44 of the outward flange 46 of the lid member 50
On the bottom surface, a plurality of (four in this embodiment) protrusions 58 are provided at predetermined intervals from each other and project toward the bottom of the cylindrical portion 44 at positions a predetermined distance away from the cylindrical portion 44. Then, the cylindrical portion 44 of the lid member 50 is fitted into the opening of the guide hole 40 via the rubber ring 52 until the protrusion 58 comes into contact with the end surface of the guide arm portion 20 located on the opening side of the guide hole 40. According to
The outward flange 46 of the lid member 50 is connected to the rubber ring 52.
With the rubber ring 52 being elastically abutted against the protruding edge of the guide hole 40 with a predetermined pressing force and being pinched by the inner circumferential surface of the guide hole 40 and the outer circumferential surface of the cylindrical portion 44, the closing device 54 is opened. It is installed in the opening of the guide hole 40 and the opening of the guide hole 40 is closed. Thereby, intrusion of water, mud, etc. into the guide hole 40 is suitably prevented. In this example,
The rubber ring 52 constitutes an elastic member, and the protrusion 58 constitutes a stopper.

Next, the valve operation of the guide hole closing device 54 will be explained.

When assembling the caliper 10 to the slide pin 26 at its guide arm portion 20 or when replacing the pads 28 and 30 with one slide pin 24 removed, the axial direction of the guide arm portion 20 and the slide pin 26 is When the air pressure in the guide hole 40 increases and exceeds a predetermined value due to the relative movement of the rubber ring 52, the air pressure in the guide hole 40 guided by the groove 48 causes the rubber ring 52 to protrude. A portion of the end portion is elastically deformed toward the outer periphery to open a space between the protruding end edge of the rubber ring 52 and the outward flange 46, thereby exhausting the pressure inside the guide hole 40. Thereby, work such as assembling the caliper 10 can be performed smoothly. The predetermined value of the air pressure inside the guide hole 40 is an air pressure that hardly impairs the workability of assembling the caliper 10, and is such that the inside of the guide hole 40 is evacuated at such air pressure. , the protrusion dimension of the rubber ring 52 from the opening end of the guide hole 40, the protrusion dimension of the protrusion 58, the width dimension of the groove 48, the thickness and hardness of the rubber ring 52, etc. are determined in advance. Note that during braking, the guide arm portion 20 of the caliper 10 may be moved in a direction separating it from the torque plate 22 (to the right in FIG. 4), resulting in a slight negative pressure inside the guide hole 40. However, at this time, the protruding end portion of the rubber ring 52 hardly deforms toward the inner periphery, and the sealed state is maintained, thereby preventing water and the like from entering into the guide hole 40.

Here, FIG. 5 is a diagram showing a state in which a rubber plug 70, which is an example of a conventional guide hole closing device, is attached. This rubber plug 70 has a head 72 and a neck 7.
4 and a locking part 76, and a bottomed hole 78 reaching the head 72 from the end surface on the side of the locking part 76 is provided inside the hole 78, and a bottom of the bottomed hole 78 and a locking part 76 are provided in this order. A slit 80 of a predetermined length is formed between the head 72 and the top surface thereof. rubber plug 7
0 is inserted into the small diameter hole 82 provided in the inner peripheral surface of the guide hole 40 from the locking portion 76 side, thereby closing the opening of the guide hole 40. In this rubber plug 70, when the air pressure in the guide hole 40 exceeds a predetermined value, the head 72 of the rubber plug 70 is elastically deformed and the slit 80 is opened, so that the pressure in the guide hole 40 is exhausted. It is becoming more and more common. However, since the rubber plug 70 is elastically deformable and the slit 80 is usually formed by punching, it is relatively difficult to form the slit 80 stably.
If the length of the guide hole 40 is smaller than the lower limit of the manufacturing standard, or if the slit 80 does not penetrate completely, the air pressure inside the guide hole 40 will not be exhausted even if it exceeds the predetermined value. zu, Calipa 10
There was a problem in that the ease of assembly, etc., was impaired.

In contrast, the guide hole closing device 54 of this embodiment
According to
0 through the rubber ring 52, the contact state between the protruding edge of the rubber ring 52 and the portion of the outward flange 46 of the lid member 50 located around the groove 48 is such that the outward flange Since the protrusion 58 provided on the guide arm 46 is regulated by contact with the end surface of the guide arm portion 20, the contact state can be ensured relatively stably, and the portion functioning as an on-off valve can be relatively stabilized. It can be formed in a state where As a result, when the air pressure inside the guide hole 40 exceeds a predetermined value, the pressure inside the guide hole 40 can be more reliably evacuated than in the past.

Further, according to this embodiment, the lid member 50 can be easily formed by pressing a steel plate, and the protrusion 58 can be formed at the same time as the lid member 50 is press-formed.
On the other hand, since the rubber ring 52 has a simple shape and a thin wall and does not require much material, the guide hole closing device 54 has the advantage of having a relatively simple structure and being provided at a relatively low cost. be.

Further, according to this embodiment, since the rubber ring 52 is mostly covered by the metal lid member 50,
Even if a stone or the like hits the guide hole closing device 54, damage to it can be suitably prevented.

In addition, in the above-mentioned embodiment, the groove 48 extending in the direction substantially parallel to the axis is formed on the outer circumferential surface of the cylindrical portion 44 of the lid member 50.
Although one groove is formed, it does not necessarily have to be configured in this way; for example, a groove extending obliquely with respect to the axis may be formed, or a plurality of grooves may be formed. It is okay to do so.

Further, in the above-described embodiment, the stopper is constituted by the protrusion 58 provided on the outward flange 46 of the lid member 50, but this is not necessarily necessary. The annular projection 56 may also function as a stopper.
In this case, based on the contact between the annular projection 56 and the bottom of the cylindrical portion 44 of the lid member 50, the contact state between the outward flange 46 and the protruding edge of the rubber ring 52 is regulated, and the annular projection 56 Said groove 48 of
A notch will be provided as an air passage in a portion corresponding to the above.

Further, in the above-mentioned embodiment, the outward flange 46 of the lid member 50 is brought into elastic contact with the protruding end edge of the rubber ring 52 with a predetermined pressing force, but it is not elastic and simply contacts the protruding edge of the rubber ring 52. It is possible to obtain some of the effects of the present invention even if the user is only forced to do so.

Further, in the above-mentioned embodiment, the annular projection 56 prevents the rubber ring 52 from moving relative to the base side of the slide pin 26. In addition, an annular groove may be provided on the inner circumferential surface of the guide hole 40, and an annular protrusion may be fitted into the annular groove to prevent relative movement of the rubber ring toward the base of the slide pin 26.

Further, in the above embodiment, the elastic member is constituted by the rubber ring 52, but it may be made of resin.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main part of FIG. 4, and is a cross-sectional view showing the lid member rotated by a predetermined angle. FIG. 2 is a view taken along arrow A in FIG. FIG. 3 is a diagram showing the main parts of a pin slide type disc brake equipped with a guide hole closing device to which the present invention is applied. FIG. 4 is an enlarged view of a main part of a cross-sectional view taken along the line (-) in FIG. 3. FIG. FIG. 5 is a diagram showing a state in which the conventional guide hole closing device is installed, and corresponds to FIG. 1. 10... Caliper, 12... Disc rotor,
22...torque plate (supporting member), 26...
Slide pin, 40...Guide hole, 44...Cylindrical portion, 46...Outward flange, 48...Groove, 50...
...Lid member, 52...Rubber ring (elastic member), 5
4...Guide hole closing device, 58...Protrusion (stopper).

Claims (1)

[Claims for Utility Model Registration] A disk rotor, a slide pin protruding from a support member parallel to the axis of the disk rotor, and a guide hole penetrating in a direction parallel to the axis of the disk rotor. and a caliper supported by the support member so that the slide pin is slidably fitted into the guide hole so as to be movable in a direction parallel to the axis of the disk rotor. In a pin slide type disc brake in which the protruding end is located in the guide hole, the slide pin is provided in an opening of the guide hole on the protruding end side of the slide pin to close the opening and to reduce air pressure in the guide hole. A guide hole closing device that allows exhaust pressure in the guide hole when a predetermined value is exceeded, the device having a thin-walled cylindrical shape, and having the slide on the inner circumferential surface of the opening of the guide hole on the side from which the slide pin protrudes. an elastic member whose one end is caused to protrude from the open end of the guide hole by being fitted in a state where relative movement of the pin toward the base side is prevented; a bottomed cylindrical part; and an open end of the cylindrical part. an outward flange provided on the cylindrical portion, and a groove provided on the outer circumferential surface of the cylindrical portion and connected between the bottom side end surface of the cylindrical portion and the outward flange, and the cylindrical portion a lid member that is fitted into the opening of the guide hole so that the outward flange is brought into contact with the protruding edge of the elastic member; A guide hole closing device for a pin slide type disc brake, comprising a stopper that prevents the lid member from being fitted in and restricts the contact state between the outward flange of the lid member and the protruding end edge of the elastic member.