JP2675061B2 - Disc brake - Google Patents

Description

The present invention relates to a slide pin receiving piece attached to a stationary member of a vehicle and a disc brake that supports a caliper via the slide pin.

"Prior Art" As a conventional disc brake, for example, a caliper is slidably attached to a carrier attached to a stationary member of a vehicle through a slide pin, and the caliper is supported at two locations on one side of the disc. Are known.

In this disc brake, a hydraulic cylinder facing both sides of the disc and a reaction portion are connected by a bridge portion that straddles the outer circumference of the disc, and a friction cylinder disposed on both sides of the disc by a piston provided in the hydraulic cylinder of the caliper. One inner pad of the pads is pressed against one side surface of the disk, and the reaction force generated at this time causes the other reaction pad to be pressed against the other side surface of the disk by the 8 reaction portion, thereby braking the rotating disk. It was made to be done.

By the way, among the disc brakes of this type, in the brakes of large vehicles (especially trucks and buses), a slide formed on the carrier 1 as shown in FIGS. 11 and 12 is used to support a heavy caliper. The slide pin 2 is inserted into the pin hole, and a part of the heavy caliper 4 is fitted into the slide pin 2 at four positions on both sides of the disk 3, and the caliper 4 is attached by the carrier 1 through the slide pin 2. There is a pin slide type disc brake in which one slide pin 2 is removed so as to support it, and the caliper 4 can be rotated about the other slide pin 2 as a fulcrum to easily replace the friction pad 5.

Further, in the conventional disc brake, there is a so-called direct mount type disc brake in which a rail for guiding a caliper without a knuckle, which is a stationary member of a vehicle, is provided, the caliper is fitted to this rail, and the caliper is directly supported by the rail of the knuckle.

[Problems to be Solved by the Invention] However, as described above, in the case where the caliper 4 is supported through the carrier 1, particularly in a large vehicle, the weight is large because the large carrier 1 is used. There was a problem of high cost. Therefore, when the carrier is simply omitted and the slide pin is fixed to the stationary member of the vehicle, the vehicle manufacturer has to attach the slide pin, resulting in poor assembly workability.

On the contrary, in the direct mount type disc brake in which the caliper is swung along the rail, the weight and cost are low because no carrier is used. However, in this disc brake, since the sliding portion of the caliper is exposed, there is a problem that muddy water is applied to the exposed portion or soil adheres to cause rust on the sliding portion of the caliper.

The present invention solves the above-mentioned problems of the conventional disc brake, has good assembling workability, can be made lightweight and can be reduced in cost, and the sliding portion of the caliper can be sealed. It is an object of the present invention to provide a disc brake in which rust is prevented.

"Means for Solving the Problems" The present invention has the following configuration to achieve the above object. That is, a caliper provided with a pair of friction pads arranged on both sides of the disc, at least one hydraulic cylinder facing one of the pair of friction pads, and a reaction portion facing the other, and attached to the caliper. A disc brake comprising at least two pin members for guiding the caliper to a stationary member of a vehicle, a pin receiving piece is slidably provided on the pin member, and the pin receiving piece is provided between the pin member and the pin receiving piece. The sliding portion is sealed by a sealing member, and the pin receiving pieces are fixed to the stationary member by screwing and fixing means.

[Operation] Assemble the disc brake constituent members in advance, and simply attach a small pin receiving piece with a simple shape to the stationary member by screw fastening and fixing means to attach the disc brake to the stationary member via this pin receiving piece. Is possible, which greatly improves assembly workability,
It is possible to reduce the weight and cost, and by sealing the sliding part between the pin receiving piece and the pin member with a sealing member, it is possible to prevent the sliding part from being rusted by muddy water, soil, etc. It is possible to always ensure the smooth operation of the caliper.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, 11 is a disc brake,
The disc brake 11 includes a pair of slide pin receiving pieces (pin receiving pieces) 13 attached to the upper ends of a pair of mounting portions (knuckles) 12 of stationary members provided facing each other and a piston 14 inside. A caliper 19 in which two hydraulic cylinders 15 and 16 slidably provided and a reaction portion 17 facing the hydraulic cylinders 15 and 16 are connected by a bridge portion 18 and one side of a disc 20 are attached to a piston 14. Inner pad (friction pad) 21
And an outer pad (friction pad) 22 arranged on the other side of the disc 20 and attached to the reaction portion 17, and a pair of slide pin receiving pieces 13 attached to the caliper 19.
In general, the slide pin 23 is slidably supported via the sleep 40 and an integral slide pin 23.

A stepped portion 24 and a chamfered portion 25 adjacent to the stepped portion 24 are formed at the upper ends of the pair of mounting portions 12 of the stationary member.
A plurality of female screw holes 26 are formed in 25. In addition, a guide portion 27 that guides the inner pad 21 and the outer pad 22 is formed on the opposing surface portions of the upper ends of the pair of mounting portions 12 of the stationary member.

The slide pin receiving piece 13 has a shape in which a mounting plate portion 29 extends obliquely downward from one corner portion of the substantially rectangular parallelepiped portion 28, and a pin hole 30 is formed in the substantially rectangular parallelepiped portion 28, and the mounting plate portion 29 is formed.
A plurality of bolt holes 31 are formed in the. As shown in FIG. 5, annular grooves 30a and 30b are formed on the inner peripheral surfaces of both ends of the pin hole 30.

The slide pin receiving piece 13 is fixed to the pair of mounting portions 12 of the stationary member as follows. That is, one corner of the substantially rectangular parallelepiped portion 28 extending in the axial direction of the hydraulic cylinders 15 and 16 of the caliper 19 is brought into contact with the stepped portion 24, and the mounting plate portion 29 is brought into contact with the chamfered portion 25. In this state, multiple bolt holes
A bolt (screw fastening means) 32 is inserted into 31. The bolt 32 is further screwed into the female screw hole 26, and the bolt 32
Thus, the slide pin receiving piece 13 is fixed to the pair of mounting portions 12 of the stationary member.

In addition, the backing 21a of the inner pad 21 and the outer pad 22
A pair of substantially L-shaped engaging projections 33 are integrally provided at the end portions of the stationary member with the backing metal 22a on the side of the pair of mounting portions 12 respectively.

Also, as shown in FIG. 4, an elongated leaf spring 34 is attached to the central portion of the backing plate 21a of the inner pad 21, and the leaf spring 34 is bent and fitted into the recess 14a formed in the piston 14. The inner pad 21 is attached to the piston 14 by the leaf spring 34. Further, the back metal 22a of the outer pad 22 is attached to the reaction portion 17 of the caliper 19 with machine screws 35. By these, the inner pad 21 and the outer pad 22 are assembled to the caliper 19.

The caliper 19 includes a pair of arm portions 36 protruding from the outer circumferences of the hydraulic cylinders 15 and 16 in a direction orthogonal to the axes of the hydraulic cylinders 15 and 16, and an arm portion 36 from the reaction portion 17.
And a pair of arm portions 37 projecting in the same direction. A female screw hole 38 is formed in the arm portion 36, and the arm portion 37
A pin hole 39 is formed in this.

A sleeve 40 slidably fitted in the pin hole 30 is supported on the slide pin receiving piece 13. The entire length of the sleeve 40 is set to a length that can be fitted between the facing surfaces (inner side surfaces) of the arm portion 36 and the arm portion 37 of the caliper 19 which are substantially the same as the distance between the facing surfaces. Annular grooves 40a and 40b are formed on the outer circumferences of both ends of the sleeve 40, respectively.

A caliper 19 is arranged between the pair of mounting portions 12 of the stationary member, and each engaging protrusion 33 of the inner pad 21 and the outer pad 22.
Is the guide portion formed on the integral mounting portion 12 of the stationary member.
27, the inner pad 21 and the outer pad 22 are suspended from the pair of mounting portions 12 of the stationary member by the engagement protrusions 33 and are movable in the axial direction of the hydraulic cylinders 15 and 16. There is.

Between the end of the sleeve 40 on the side of the arm portion 36 and the end of the slide pin receiving piece 13, both ends are fitted into the annular groove 40a of the sleeve 40 and the annular groove 30a of the slide pin receiving piece 13, respectively. An annular seal member (sealing member) 41 is provided.

Between the end of the sleeve 40 on the arm portion 37 side and the end of the slide pin receiving piece 13, both ends are fitted in the annular groove 40b of the sleeve 40 and the annular groove 30b of the slide pin receiving piece 13, respectively. A cylindrical boot (sealing member) 42 is provided. The seal member 41 and the boot 42 are allowed to expand and contract in the axial direction of the sleeve 40.

In addition, the pair of arm portions 36 and the integral arm portion 37,
The slide pin 23 is provided across the arm portions 36 and 37. That is, the slide pin 23 is provided with the head 23b at one end of the rod 23a, and the rod 23 is adjacent to the head 23b.
A male screw 23c having a predetermined length is formed on the outer periphery of a, and the male screw 23c is fitted into the female screw hole 38, the seal member 41, the sleeve 40, and the boot 42 of the arm portion 36 from the arm portion 36 side toward the arm portion 37 side. The male screw 23c is screwed into the female screw hole 38, the tip of the rod 23a is fitted into the pin hole 39 of the arm portion 37, whereby the pair of mounting portions 12 of the stationary member have the slide pin receiving pieces 13,
A caliper 19 is slidably attached via a sleeve 40 and a slide pin 23. Therefore, the seal member 41 and the boot 42 are provided between the slide pin receiving piece 13 and the sleeve 40.
Sealed.

A chamber between the hydraulic cylinders 15 and 16 and the pistons 14 and 14 is supplied with pressurized liquid from a master cylinder (not shown) through a pipe (not shown).

And the inner pad attached to the caliper 19
21 and the outer pad 22 sandwich the disc 20 to attach the disc brake 11 to the pair of mounting portions 12 of the stationary member,
The disk 20 rotates and the pistons 14 of the hydraulic cylinders 15 and 16
When pressure oil is applied to 14, the pistons 14 and 14 press the inner pad 21 against one side surface of the disc 20, and the slide pin 23 slides on the slide pin receiving case 13 via the sleeve 40 by the reaction force generated at this time. Move, Reaction Department
The out pad 22 presses the other side surface of the disk 20 by 17 and thereby brakes the rotating disk 20.

In this embodiment, the disc brake constituent member is assembled in advance, the inner pad 21 and the outer pad 22 are engaged with the pair of mounting portions 12 of the stationary member, and the slide pin receiving piece 13 having a simple shape and a small size is attached to the bolt 32. The disc brake 11 can be attached to the pair of attachment portions 12 of the stationary member via the slide pin receiving piece 13 only by attaching the screw brake fixing means.
For example, for a vehicle manufacturer, a slide pin receiving piece
When parts manufacturers such as 13, caliper 19, piston 14, slide pin 23, inner pad 21, outer pad 22, seal member 41, boot 42, etc. deliver these parts, these parts are The disk brake 11 shown in FIG. 2 is assembled and delivered in a state in which the pair of mounting portions 12 of the stationary member are removed from the drawing in which the stationary member is integrally mounted on the mounting portion 12.

On the other hand, in a vehicle manufacturer, the inner pad 21 and the outer pad 22 are engaged with the pair of mounting portions 12 of the stationary member of the vehicle, and the slide pin receiving piece 13 is simply tightened and fixed to the pair of mounting portions 12 of the stationary member with the bolts 32. Thus, the disc brake 11 can be attached to the pair of attachment portions 12 of the stationary member.

As described above, according to this embodiment, the assembling workability can be significantly improved, the weight can be reduced, and the cost can be reduced. The sliding portion between the slide pin receiving piece 13 and the slide pin 23 has the seal member 41, Since it is sealed by the boots 42, it is possible to prevent the sliding portion from rusting due to muddy water, soil, etc., and to ensure a smooth operation of the caliper 19 (the above first
Example).

In the above embodiment, the slide pin receiving piece is provided on the chamfered portion 25 formed on the pair of mounting portions 12 of the stationary member.
Although 13 is fixed by bolts 32, it is not limited to this, and may be configured as shown in FIG. 6, for example. That is,
A slide pin receiving piece 51 having a shape in which orthogonal rectangles are connected by an inclined plate (a shape in which a chamfered portion is provided at a corner of an inverted L-shaped member in cross section) is formed, and a pin hole is provided at one end of the slide pin receiving piece 51. 30 is formed, and a bolt hole 31 is formed at the other end.

On the other hand, the female screw hole 26 is formed in the outer surface (vertical surface) 52a parallel to the guide surface 27a of the guide portion 27 of the pair of mounting portions (knuckles) 52 of the stationary member.

Then, the slide pin receiving pieces are respectively attached to the pair of mounting portions 52 of the stationary member by the bolts 32 inserted into the bolt holes 31.
51 may be clamped and fixed.

By doing so, the maximum distance from the center of rotation of the disk 20 to the outer surface of the bridge portion 18 of the caliper 19 can be made shorter than that of the first embodiment, and no mounting place is required (above second embodiment). ).

Further, in the first and second embodiments, the inner pad 21 and the outer pad 22 are engaged with the integral mounting portions 15 and 52 of the stationary member, but not limited to these.
For example, the configuration may be as shown in FIGS. 7 and 8.
That is, the slide pin receiving piece 62 is formed by providing the locking protrusion 61 projecting from the corner of the prism having the pin hole 30.

On the other hand, fold the leaf spring member into a U shape, and
As shown in the figure, the pad spring 63 is formed as the folded back tongue portions 63a and 63b. And this pad spring
The locking protrusion 61 is fitted in the U-shaped portion of 63 and the pad spring 63 is fixedly attached to the locking protrusion 61.

On the other hand, a rectangular recess 64a is formed in the engaging protrusion 64 formed on the back metal 21a of the inner pad 21 and the back metal 22a of the outer pad 22. Then, the U-shaped portion of the pad spring 63 is slidably fitted in the rectangular recess 64a, and the slopes 64b, 64c formed on the upper and lower surfaces of the engaging protrusions 64 of the inner pad 21 and the outer pad 22 are As shown in FIG. 8, the tongue pieces 63a and 63b at both ends of the pad spring 63 are spread outward and engaged in a pressed state, and the slide pin receiving piece 62 is fitted to the inner pad.
21, Install the outer pad 22.

On the other hand, a substantially V-shaped recess 66 is provided at the upper ends of a pair of attachment parts (knuckles) 65 of the stationary member. Then, the locking protrusions 61 are positioned inside the pair of mounting portions 65 of the stationary members facing each other. In this state, the slide pin receiving piece 62 is fitted into the substantially V-shaped recess 66.

Next, a pressing fixing plate (a part of the screw tightening fixing means) 67 is placed on each upper surface of the pair of mounting portions 65 of the stationary member and the slide pin receiving piece 62. Then, the bolts 32 inserted through the pressing and fixing plate 67 are screwed into the pair of mounting portions 65 of the stationary member, and the slide pin receiving piece 62 is fixedly mounted to the pair of mounting portions 65 of the stationary member. As described above, the disc brake 11 is attached to the pair of attachment portions 65 of the stationary member. The pad spring 63 is preferably plated so as to have good slidability.

In this way, the slide pin receiving piece 62 can guide the inner pad 21 and the outer pad 22 without rattling, and there is rust between the pad spring 63 and the inner pad 21 and the outer pad 22 which are torque receiving surfaces. This can prevent the inner pad 21 and the outer pad 22 from operating smoothly. In order to attach the pad spring 63 to the locking projection 61 in a fixed state, an axial movement restricting piece (not shown) engaging with the locking projection 61 is attached to the axial end surface of the pad spring 63 in FIG. It may be provided (the above is the third embodiment).

Further, as another embodiment of each of the above embodiments, it may be configured as shown in FIG. 9 and FIG. That is, the first
A shape in which the outer surface of the mounting plate portion 29 of the slide pin receiving piece 13 of the embodiment is extended upward, and the locking projection 71 is provided on one side surface of the substantially rectangular parallelepiped portion 28 having the pin hole 30 on the side opposite to the mounting plate portion 29. To form the slide receiving piece 72.

On the other hand, a pad spring 73 having the same structure as the pad spring 63 of the third embodiment is formed. Then, the locking projection 71 is fitted into the U-shaped portion of the pad spring 73, and the pad spring 73 is fixedly attached to the locking projection 71.

On the other hand, the engaging projection 74 formed on the back metal 21a of the inner pad 21 and the back metal 22a of the outer pad 22 is formed with a rectangular recess 74a.

Then, the U-shaped portion of the pad spring 73 is slidably fitted into the rectangular recess 74a. Along with this, the tongue pieces 73a at both ends of the pad spring 73 and the pad spring 73
Between the U-shaped part and the tongue piece 73b and the pad spring 73
The upper and lower protrusions of the engaging protrusions 74 of the inner pad 21 and the outer pad 22 are fitted between the U-shaped portion and the U-shaped portion.

Then, the tongue members 73a, 73b are pressed against the horizontal planes 74b, 74c formed above and below the engaging protrusions 74 of the inner pad 21 and the outer pad 22, respectively.

In this way, the engagement protrusion 74 is
The inner pin on the slide pin receiving piece 73.
21, Install the outer pad 22.

Next, the locking projections 71 are positioned inside the pair of mounting portions 12 of the stationary member that face each other, and the pair of mounting portions 12 of the stationary member 12 are arranged.
The slide pin receiving pieces 72 are placed on the step portions 24, respectively. In this state, the slide pin receiving piece 72 is fastened and fixed to the pair of mounting portions 12 of the stationary member by the bolts 32, whereby the pair of mounting portions 12 of the stationary member are disc-braked.
Attach 11 The pad spring 73 is preferably plated, and the effect of this embodiment is the same as that of the third embodiment (the above fourth embodiment).

In each of the above embodiments, the slide pin 23 is described as being supported by the caliper in a two-sided manner.
Obviously, the present invention can be applied to the cantilever type.

[Advantages of the Invention] According to the present invention, it is possible to assemble a disc brake component member in advance and attach a pin receiving piece having a simple shape and a small size to a stationary member by screw fastening and fixing means. A disc brake can be attached to the stationary member, greatly improving assembly workability,
It is possible to reduce the weight and cost, and the sliding part between the pin receiving piece and the pin member is sealed by the sealing member, which prevents the generation of rust due to the adhesion of muddy water or soil on this sliding part. Therefore, it is possible to always ensure the smooth operation of the caliper.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention.
FIG. 1 is a partially cutaway vertical rear view, FIG. 2 is a partially cutaway plan view, FIG. 3 is a longitudinal sectional view of an essential part, FIG. 4 is a longitudinal side view of the essential part, and FIG. A transverse plan view, FIG.
FIG. 7 and FIG. 8 show a third embodiment of the present invention. FIG. 7 is a partially cutaway longitudinal sectional rear view, and FIG. 8 is a longitudinal sectional view of an essential portion. A plan view, FIGS. 9 and 10 show a fourth embodiment of the present invention. FIG. 9 is a perspective view of an essential part, FIG. 10 is a longitudinal sectional view of the essential part, and FIGS. FIG. 11 shows an example of a conventional disc brake. FIG. 11 is a plan view and FIG. 12 is a rear view. 12,52,65 …… A pair of mounting parts (knuckles) for stationary members, 1
3,51,62,72 …… Slide pin receiving piece (pin receiving piece), 14 …… Piston, 15,16 …… Hydraulic cylinder, 17…
… Reaction section, 19 …… Caliper, 20 …… Disc,
21 …… Inner pad (friction pad), 22 …… Outer pad (friction pad), 23 …… Slide pin, 32 …… Bolt (screw fastening means), 33,64,74 …… Engagement protrusion, 36,3
7 …… Arm part, 40 …… Sleeve, 41 …… Sealing member (sealing member), 42 …… Boots (sealing member), 61, 71 ……
Locking protrusions, 63, 73 …… Pad springs, 67 …… Holding fixing plate (part of screw tightening fixing means).

Claims (1)

(57) [Claims] 1. A caliper comprising a pair of friction pads disposed on both sides of a disc, at least one hydraulic cylinder facing one of the pair of friction pads, and a reaction portion facing the other, Attached to the caliper,
A disc brake comprising at least two pin members for guiding the caliper to a stationary member of a vehicle,
A pin receiving piece is slidably provided on the pin member, a sliding portion between the pin member and the pin receiving piece is sealed by a sealing member, and the pin receiving piece is fixed to the stationary member by screwing and fixing means. Disc brakes characterized by fixing each.