JPS6115315Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of the slide pin mechanism of a pin slide type disc brake.

Of a pair of pads arranged on both sides of a disc rotor that rotates in a type of disc brake, one pad is pressed against one side of the disc rotor by the action of a piston that is slidably fitted to a caliper, and the other pad is There is a type in which the caliper moves as a result of the reaction, and is pressed against the other side of the disc rotor by a claw provided opposite the piston. A pair of slide pins are installed upright on the torque receiving member to guide the movement of the caliper, but this slide pin is often composed of a bolt and a cylindrical pin, and the pin is attached to the arm of the caliper. At the same time, a bolt is inserted through the pin and screwed into the torque receiving member. Also,
The parts of the pin that protrude to both sides of the caliper arm are covered with respective boots to protect them from dust and the like.

In this type of slide pin mechanism, if the pins rotate together when the bolt is tightened, the boot will twist. This is because one end of the boot is fixed to the caliper and the other end to the pin. Therefore, the pin requires a tool engaging portion for engaging the tool and preventing rotation, and this tool engaging portion may be provided at the end of the pin remote from the torque receiving member. Desirable from the viewpoint of workability. On the other hand, the other end of the pin is brought into contact with the torque receiving member, thereby fixing the pin at right angles to the torque receiving member, so this end must also have a large diameter in order to improve the perpendicularity. It is desirable that

However, if large diameter parts are provided at both ends, the pin cannot be inserted into the pin fitting hole in the caliper arm, so in the past, the entire pin was required for smooth guidance of the caliper. I had no choice but to make it thicker than the standard diameter.

The purpose of the present invention is to improve this slide pin mechanism to provide a new slide pin mechanism that is lightweight, has good assembly accuracy, and prevents the boot from twisting during assembly. The gist is that a pin that is cylindrical as a whole and has a large diameter seat at one end is inserted into a pin fitting hole in a caliper, and the other end of the pin is made of copper, brass, aluminum, etc. A sleeve equipped with a rotation prevention tool engagement part on the outer periphery is brought into contact with a soft metal washer, and these pins, washer, and sleeve are tightened to the torque receiving member by a bolt inserted from the sleeve side. In addition to fixing the caliper, a boot is attached between the caliper and the sleeve.

The present invention will now be described in more detail with reference to the drawings showing two and three embodiments thereof.

In Figures 1 and 2, reference numeral 1 denotes a knuckle which is a non-rotating member. A hub 5 is rotatably supported on an axle 2 fixed to the knuckle 1 via bearings 3 and 4, and a disk rotor 6 is fixed to the hub 5.

A torque receiving member 7 is also fixed to the nutcle 1 with a bolt 8. The torque receiving member 7 includes a base portion 7a, a pair of arm portions 7b and 7c, and a connecting portion 7.
The inner pad 11 and the outer pad 12 are fixed to the knuckle 1 at the base 7a, and the engagement protrusions 11a and 12a are engaged with the engagement notches provided in the arm sections 7b and 7c. It is held movably in a direction parallel to the axis of the disk rotor 6.

The inner pad 11 and the outer pad 12 are
In this state, both friction surfaces 6 of the disc rotor 6 are
A and 6b are opposed to each other, and a substantially saddle-shaped caliper 13 is disposed astride them. Calipa 1
A cylinder 13a is formed in a portion facing the inner pad 11 of No. 3, and this cylinder 13a
A piston 14 is fluid-tightly fitted in the actuator 15. On the other hand, the caliper 13 has a pair of claws 1 on the part facing the outer pad 12.
3b is formed. The caliper 13 is held by a holding mechanism 16 so as to be movable in a direction parallel to the axis of the disk rotor 6.

The holding mechanism 16 includes a pair of slide pins 20 and 30 erected on the torque receiving member 7.
The slide pin 20 is erected on the arm portion 7b parallel to the axis of the disk rotor 6, as shown in FIG. The caliper arm 1 has a guide hole (pin fitting hole) 13c in the slide pin 20.
3d is fitted. The slide pin 30 has the same structure as the slide pin 20, but the fitting length with the guide hole 13c is longer than that of the slide pin 20, and the slide pin 30 is a main pin and the slide pin 20 is a sub pin. It is said that

As shown in FIG. 3, the slide pin 20 is made up of a pin 21, a washer 22, a sleeve 23, and a pin bolt 24 that passes through them and is screwed into the torque receiving member 7. The aforementioned caliper arm 13d is fitted to the pin 21, and boots 25 of the same shape are installed between both ends of the caliper arm 16d and the slide pin 20, to prevent water, dust, etc. from entering between the two. has been done.
Note that retainers 26 ((FIG. 5)) for engaging the caliper arm 13d and the boot 25 are attached to both ends of the caliper arm 13d, respectively.

The pin 21 is connected to the pin bolt 2 as shown in FIG.
4 is a hollow cylinder having a through hole 21d through which the guide hole 13 of the caliper arm 13d is inserted.
It has a large diameter seat 21a at one end and a groove 21b for locking the boot 25 in the vicinity of the seat 21a.
It has a tapered portion 21c suitable for insertion.

As shown in FIGS. 6 and 7, the washer 22 interposed between the pin 21 and the sleeve 23 is a molded product of a soft metal plate such as copper, brass, or aluminum, and has a diameter approximately equal to the bottom diameter of the groove portion 21b. A body part 22a having the same outer diameter and a flange 22b for locking the boot 25 are provided at the end of the body part 22a, and a through hole 22c through which the pin bolt 24 passes is provided in the flange part 22b.

As shown in FIG. 8, the sleeve 23 is provided with a rotation prevention tool engaging portion 23a having the same shape as a hexagonal nut or the like on its outer periphery, and its body portion 23b can be fitted into the body portion 22a of the washer 22. It has an outer diameter and has a through hole 23c for the pin bolt 24 in the center.
It is equipped with

The boot 25 is shaped so that one end thereof can be engaged with both ends of the caliper arm 13d via the retainer 26, and the other end is shaped so that it can be engaged with both the groove 21b of the pin 21 and the washer 22. ing. That is, the boot 25 can be used on both sides.

In the disc brake slide pin mechanism configured as described above, the seat 21a of the pin 21 is
Since the slide pin 20 is brought into contact with the arm 7b, which is a part of the torque receiving member 7, over a wide area, the slide pin 20 is easily perpendicular to the arm 7b during assembly. Therefore, since the diameter of the pin 21 can be made as small as possible while maintaining the perpendicularity, the weight of the slide pin mechanism can be effectively reduced. Also, when tightening the pin bolt 24, the hexagonal part of the sleeve 23 can be held with a spanner or the like to prevent the sleeve 23 from rotating together.
There is an advantage that the boot 25 engaged with the sleeve 23 is not scratched. Furthermore, the washer 22 not only forms a seat for locking the boot 25, but also is interposed between the pin 21 and the sleeve 23 as a soft metal packing that is easy to fit, so that the sealing performance of the contact portion of the end surfaces of the two is improved. This prevents water from entering the boot 25 and leakage of lubricants such as grease from the boot 25. Furthermore, since the boot 25 can be shared, incorrect assembly can be prevented and the number of parts can be reduced.

In the above-mentioned embodiment, the most preferable example of the washer 22 and sleeve 23 for locking the boot 25 was described, but the present invention is not necessarily limited to this, and as shown in FIGS. 9 to 14. Even if it is a structural thing, there is no difference. That is, the ninth
In the figure, the cross-sectional shape of the washer 27 is first bent toward the sleeve 23 side to form a seat for locking the boot 25, and then the washer 27 is turned 180 degrees and the pin 2
It is bent toward one side and narrowed with a gentle slope toward the tapered portion 21c. Therefore, the boot 25 can be easily inserted and the boot 25 will not be damaged. In addition, in FIG. 10, the cross-sectional shape of the washer 28 is bent toward the forward sleeve 23 by an angle smaller than a right angle, and then bent at right angles to the side surface of the sleeve 23 to facilitate the insertion of the boot 25. 25
The formation of a seat that does not damage the material is similar to the embodiment shown in FIG. Furthermore, in Figure 11,
The sleeve 29 has a relatively thin shape that can be press punched, and a seat on which the boot 25 is locked is formed on the washer 31.
The outer circumferential portion of the pin 21 is tapered so as to be slightly inclined toward the tapered portion 21c surface of the pin 21. This embodiment has the unique advantage that the sleeve 29 is easy to process and the boot 25 is easy to insert.

In each of the above embodiments, the washers 22, 27, 2
8 and 31 both form a seat for locking the boot 25, but it is also possible to form the seat on the sleeve instead of the washer, and in FIG. 12, the sleeve 32 is provided with a groove 32a. The washer 33 forms a seat that locks the boot 25.
is crimped to the sleeve 32. In FIG. 13, the sleeve 34 is provided with a groove 34a and a tapered surface 34b (a tapered surface in the opposite direction to the tapered portion 21c) toward the contact surface with the washer 35. 3
4b, the boot 25
It has become easier to insert. In FIG. 14, the sleeve 36 is provided with a groove 36a, and the washer 37 is bent to form a tapered surface 37a in the opposite direction to the tapered portion 21c.
It serves as a guide surface that guides the boot 25 up to 6a, making it easy to insert the boot 25.

As is clear from the above explanation, in the present invention, the tool engagement part for preventing rotation, which was conventionally formed integrally with the pin, is provided in a sleeve separate from the pin, so one end of the pin has a large diameter. The overall diameter of the pin is selected to be large enough to guide the caliper smoothly, and the end that contacts the torque receiving member is large enough to ensure squareness. This makes it possible to form a seat, which makes it possible to obtain a lightweight slide pin with excellent perpendicularity. Also, when fixing the pin with a bolt, if the rotation of the sleeve in contact with the head of the bolt is prevented by engaging a tool with the tool engagement part of the sleeve, a boot provided between the sleeve and the caliper can be prevented. Furthermore, if the rotation of the sleeve is prevented, the pin will not rotate either, so if a boot is provided between the pin and the caliper, this can also be prevented from twisting. Moreover, since a soft metal washer is interposed between the sleeve and the pin, it also functions as a metal seal, preventing water, etc. that has entered the gap between the bolt and the sleeve or pin from entering the space inside the boot. Conversely, lubricants such as grease inside the boot can be prevented from leaking to the outside.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a drum brake including an embodiment of the present invention, and FIG. 2 is a plan view thereof. Figure 3 is a cross-sectional view of Figure 2;
6 and 8 are perspective views of the pin 21, retainer 26, washer 22, and sleeve 23 shown in FIG. 3, respectively, and FIG. 7 is a sectional view of the washer 22. 9 to 14 are sectional views of main parts around the head of the slide pin showing different embodiments of the washer and sleeve of the present invention. 7... Torque receiving member, 13... Caliper, 1
3c...Guide hole (pin fitting hole), 20, 30...
...Slide pin, 21...Pin, 22, 27, 2
8, 31, 33, 35, 37...Washiya, 2
3, 29, 32, 34, 36...Sleeve, 23
d...Rotation prevention tool engagement portion, 24...Pin bolt, 25...Boot.

Claims (1)

[Scope of utility model registration request] In the slide pin mechanism of a pin slide floating caliper type disc brake, a pin that is cylindrical as a whole and has a large diameter seat at one end is inserted into the pin fitting hole of the caliper, and the other end of the pin is inserted into the pin fitting hole of the caliper. A sleeve equipped with a rotation prevention tool engaging part on the outer periphery is brought into contact with a washer made of soft metal such as copper, brass, or aluminum, and a bolt is inserted through the pin, washer, and sleeve from the sleeve side. A slide pin mechanism, characterized in that the slide pin mechanism is tightened and fixed to a torque receiving member, and a boot is attached between the caliper and the sleeve.