JPS6360251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake, and more particularly to a disc brake characterized in that friction pads can be easily replaced.

The applicant of the present invention first proposed a mounting bracket which has a generally flat plate shape and is attached to one side of the disk, and a mounting bracket which is fixed to the mounting bracket at intervals in the circumferential direction of the disk, and which is attached to the disk with the mounting bracket as a boundary. A pair of pins, one end of which extends in the axial direction so as to straddle the disk, and the other end of which extends in the opposite direction, and one leg of the pair of pins is slidably guided and has an actuating function. a caliper whose other leg extends across the disk; a first friction pad that is pressed against one side of the disk by an operating mechanism of the caliper; and a first friction pad that is slidably supported on one end surface of the pair of pins and that is a second friction pad pressed against the other side of the disk by the other leg;
announced a disc brake consisting of
−44439).

In this earlier invention, the pair of pins supported the caliper and at least one friction pad on the opposite side of the mounting bracket to the disk, so the mounting bracket could be press-formed, making it easy to manufacture. Not only is it lightweight, but it can also be made lighter than a cast metal one, and it can also be configured to support a pair of friction pads, in which case the structure of the mounting bracket can be simplified. In addition, we succeeded in making the mounting bracket easier to manufacture.

However, in future inventions, when replacing the friction pad, the caliper must be separated from the bracket,
Otherwise, it was necessary to take the pad in and out of the disk in the radial direction, which resulted in very poor workability and efficiency.

The present invention has a structure in which the caliper can be rotated around the pin, so that when replacing the friction pad, the pad is completely exposed from the caliper, so that the pad can be replaced quickly and accurately. . The first concrete means for this purpose is
A method as shown in Figure 6 has been proposed.

In the proposal shown in FIGS. 1 to 6, a mounting bracket 1 is located on one side of the disc 2 and is fixed to the non-rotating part of the axle by means of a screw hole 1a. A pair of pins 3 and 4 spaced apart in the circumferential direction of the disk 2 are fixed to the bracket 1 by appropriate means such as press-fitting or welding. As shown in FIG. 3, the pin 3 extends in the axial direction of the disk 2 so that one end 3a straddles the disk 2, and supports one side of the back plate 9a of the friction pad 9 at the end. The other end 3b (guiding member) of the pin 3 is slidably fitted into a pin receiving hole 5b provided in the caliper 5. A pin boot 10 is provided to prevent foreign matter from entering the hole 5d.

On the other hand, pin 4 is shorter than pin 3, and as shown in FIG.
It has one end 4a extending in the axial direction. The end of the one end 4a supports the other side of the back plate 9a of the friction pad 9, so that the pins 3 and 4 suspend and support the pad 9 and the back plate 9a at two locations.
The other end 4b of the pin 4 is provided with a screw hole 4c extending in the direction of the central axis of the pin 4. One end of a bolt 20 is screwed into the screw hole 4c. The bolt 20 is an annular portion 5 provided integrally with the caliper.
It extends outward from the caliper 5 via c. A sleeve 21 of a predetermined length is disposed between the annular portion 5c and the bolt 20 constituting the guide member, and a sleeve 21 is disposed between the sleeve 21 and the annular portion 5c to center the sleeve 21 and prevent vibration of the sleeve. A bushing 22a is provided. Further, dust boots 22 are provided between both sides of the annular portion 5c and the sleeve 21.
b, 22c are provided, and during braking, water or water flows between the inner surface of the caliper annular portion 5c and the outer surface of the bush 22a, or between the inner surface of the bush 22a and the outer surface of the sleeve 21.
Prevents foreign objects such as stones and dirt from entering. In addition, the bush 22a and the dust boots 22b, 22
c can also be made integrally with rubber, for example.

The caliper 5 also has two legs 5a, 5b opposite both sides of the disk 2. The leg portion 5a has a cylinder 6 that opens toward the disk 2.
A piston 8 is slidably fitted into the cylinder 6. The piston 8 has the function of pressing the friction pad 7, which is disposed opposite the friction pad 9 against the disk 2, against the disk 2. The leg portions 5b are located on the back side of the back plate 9a of the friction pad, and are used to move the friction pad 9 to the disk 2 during control.
It acts to press against. In order to prevent water etc. from entering between the piston 8 and the cylinder 6, the boot 11 also returns the piston 8 to its original position, and a seal member is used to maintain liquid tightness between the piston 8 and the cylinder 6. 12 are provided.

As clearly shown in FIG. 4, the mounting bracket 1 is provided with a cavity 13 for accommodating the first friction pad 7 and the back plate 7a, and shoulders 14 are formed on both sides of the upper part of the cavity 13. , and the shoulder 14 is located in the cavity 13
The back plate 7a of the friction pad 7 housed inside is supported so as to be movable toward the disk 2.

As shown in FIG. 5, the back plate 9a of the second friction pad 9 has holes 15 and 1 through which a pair of pins 3 and 4 are inserted.
6 is provided. The friction pad 9 has the hole 15,
It is held at one ends 3a, 4a of the pins 3, 4 via 16, and is supported so as to be movable toward the disk 2.

A pad spring 17 for preventing vibration of the pads 7, 9 is disposed between the caliper 5 and protrusions 7b, 9b provided at the upper part near the center of the back plates 7a, 9a of the friction pads.

In the above-mentioned proposal, when pressure oil is fed into the cylinder 6, the piston 8 moves to the left in FIGS. 2, 3 and 6 and presses the first friction pad 7 to the right side of the disk 2. On the other hand, the caliper 5 moves to the right due to the reaction force caused by the pressing guided by the guide member constituted by the sleeve 21 fitted to the other end 3b of the pin 3 and the bolt 20, and the caliper leg 5b moves the caliper 5 to the right. A second friction pad 9 guided by 3 and 4 presses against the left side of the disc 2. By pressing both pads 7 and 9 on both sides, the disc 2
brakes.

When replacing the friction pads 7, 9, the bolt 20 is first removed from the pin 4 using a suitable tool. Next, move the caliper 5 in the direction of arrow 18 in FIG.
Rotate in the direction of. As a result, the caliper 5 rotates together with the leg portion 8a, the piston 8, the leg portion 5b, and the annular portion 5c about the other end 3b of the pin 3 within the pin receiving hole 5d. When the caliper 5 is rotated to a predetermined angle, the mounting bracket 1, the first friction pad 7 housed in the cavity 13 of the bracket, the back plate 7a, the disk 2, and one ends 3a, 4 of the pins 3, 4 are removed.
a, the back plate 9a and the second friction pad 9 supported by the one ends 3a, 4a are exposed from inside the caliper 5.

Then, the second friction pad 9 and the back plate 9a are easily pulled out from the ends 3a, 4a of the pins 3, 4, and then the pads are pulled out radially outward or tangentially of the disk 2. Next, by pushing the first friction pad 7 and the back plate 7a from the disk 2 side (toward the right in FIG. 6), this pad 7 can be easily removed from the mounting bracket 1. Normally, there is no fixed object such as the vehicle body on the right side of the disk, so it is very easy to pull out the pad 7.

When assembling the pad, it can be easily accomplished by performing the operation opposite to the detachment operation.

If the caliper 5 cannot be rotated until the mounting bracket 1 and both friction pads are completely exposed, rotate the caliper 5 to a predetermined angle and then move the caliper 5 (toward the left in Figures 3 and 6). By doing so, the caliper legs 5b and the friction pad back plate 9
A gap is provided between the back plate 9a and the pin ends 3a and 4a in the gap, and then the back plate 9a is pulled out from the pin ends 3a and 4a.
a and the pad 9 can be pulled out in the tangential direction of the disk 2. At this time, if the piston 8 is engaged with the right side surface of the back plate 7a (FIGS. 3 and 6), after removing the pad 9, move the caliper 5 sufficiently to the right to remove the pad back plate 7a and the pad. 7 can be pulled out from the gap formed between the piston 8 and the bracket 1 by pushing it out to the side opposite to the disk. Therefore, the pin receiving hole 5d of the caliper 5
has a length such that the pad back plate 9a can move enough to separate from the pin end 3a when the pin other end 3b engages with its right end.

However, in this proposal, one end of the bolt 20 as a guide member is connected to the threaded hole 7c of the pin 4.
Since the pin 4 is screwed into the bolt 20, when the bolt 20 is tightened, the pin 4 rotates together with the bolt 20, making it impossible to apply sufficient torque to the bolt 20.
It was inevitable that some slack would occur.

Therefore, in the present invention, in order to completely eliminate the drawbacks of the method disclosed in the above proposal, as a specific means, the bolt is directly screwed into the bracket at a position offset from the pin attachment device of the mounting bracket. This ensures secure bolt attachment.

7 and 8 are examples of the present invention. This embodiment differs from the proposals shown in FIGS. 1 to 6 above in the following points. That is, in the above proposal, the bolt 20 was screwed into the screw hole 4c provided in the pin 4 as shown in FIG.
0' is directly screwed into a screw hole 1b' provided in a portion of the bracket 1' other than the pin 4'. In other respects, it has the same structure as the above proposal, so in this example, the symbol of the above proposal is replaced with a dash (').
I will explain it with the following.

In this embodiment, a screw hole 1b' into which a bolt 20' is screwed is provided below the portion of the bracket 1' where the pin 4' is fixed by means such as press-fit welding. The bolt 20' is inserted through the annular part 5c' of the caliper 5', and between the annular part 5c' and the bolt 20' there is a sleeve 21, as in the case of the first embodiment.
A bush 22a', dust boots 22b', 22c', etc. are provided.

Therefore, when screwing the bolt 20' into the bracket 1', the bolt 20' can be reliably attached to the bracket 1' without considering the fixing strength of the pin 4'. In addition, since the contact surface of the sleeve 21' to the bracket 1' can be made wider than when the sleeve 21' is screwed to the pin 4', the bolt 2 can be attached to the sleeve 21'.
A tightening force of 0' can be applied reliably,
It is also possible to securely prevent loosening.

In this embodiment, when replacing the friction pad, the bolt 20' is first inserted into the threaded hole 1 of the bracket 1' with a suitable tool in the same way as proposed above.
Leave b′. The pin 3' is in a pivoting relationship to the caliper 5' via its other end and the pin receiving hole, as shown in FIG. 3, so that the caliper 5' can now pivot about said pin 3'. It has become freely possible. Therefore, the caliper 5' is rotated around the pin 3' by a predetermined angle to replace the pad in the same manner as in the above-mentioned proposal.

It is clear that the pad 7' can also be supported directly on the pins 3', 4' via the back plate 7a'.

As described above, the present invention allows pads to be easily replaced by simply removing one bolt that passes through the sliding part and rotating the brake body without removing the bracket 1' from the vehicle body. be.

In addition, in the present invention, the bolt as a guide member is directly screwed into the mounting bracket, so compared to the conventional case where the bolt is screwed into a pin fixed to the mounting bracket. The bolt can be reliably attached to the mounting bracket without considering the fixing strength of the pin, and problems such as detachment of the pin from the mounting bracket and loosening of the bolt can be effectively prevented. Further, since no force is applied to the pin itself due to the screwing of the bolt, the connection between the mounting bracket and the pin is maintained firmly, and the friction pad is smoothly guided.

Furthermore, when screwing the bolt into the mounting bracket, the bearing surface (contact surface) of the bolt or sleeve against the mounting bracket can be made wider than when screwing the bolt onto the pin, so it also functions to prevent the bolt from loosening. You can expect it.

[Brief explanation of the drawing]

Figures 1 to 6 show one proposal that is the premise of the embodiment of the present invention. Figure 1 is a front view of a disc brake, and Figures 2 and 3 are views taken in the direction of the - arrow in Figure 1. and - arrow view, Figures 4 and 5 are 2
6 is a view in the direction of the arrows in FIG. 1, and FIGS. 7 and 8 show embodiments of the present invention. 8 is a view taken along the - arrow in FIG. 7. Explanation of symbols, 1, 1'...Mounting bracket, 2,
2'...disk, 3,3',4,4'...pin,
3a, 4a...one end, 3b, 4b...other end, 4c
...Screw hole, 5, 5'...Caliper, 5a, 5b
... Leg portion, 5c, 5c' ... Annular portion, 5d ... Pin receiving hole, 6 ... Cylinder, 7, 9 ... Pad, 8 ...
...Piston, 13...Vacancy, 14...Shoulder, 1
5, 16... hole, 20, 20'... bolt, 21,
21'...Sleeve.

Claims (1)

[Scope of Claims] 1. A mounting bracket located on one side of the disk and fixed to a non-rotating part of the vehicle body, a first friction pad opposite to one side of the disk, and a pair of pins fixed to the bracket. a second friction pad supported by and opposite the other side of the disk; a first leg having a cylinder housing a piston acting on the side of the first friction pad opposite the disk; a caliper having a second leg that acts on the side opposite to the disk of the friction pad; and a pair of guide members provided on the mounting bracket and slidably supporting the caliper, one of the guide members. is a pin member that is integral with one of the pins supporting the second friction pad and is slidably received in a pin receiving hole of the caliper, and the other guide member supports the second friction pad. A disc brake that is a bolt that is screwed directly into a screw hole of the mounting bracket at a position offset from the other supporting pin and releasably locks the mounting bracket and the caliper. 2. The disc brake according to claim 1, wherein the first friction pad is suspended and supported on one side of the disc by a shoulder provided on the bracket so that it can move forward and backward. 3. The disc brake according to claim 1, wherein the bolt extends through an annular portion provided on the caliper.