JP3022187B2 - Disc brake split caliper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake type caliper mounted on a vehicle such as a four-wheeled vehicle or a two-wheeled vehicle. About caliper.

[0002]

2. Description of the Related Art There is a caliper called a pin slide type as a caliper for a disc brake. This pin slide type caliper has a frame type (for example,
JP-A-5-27367, JP-A-62-1812
No. 8 publication) and a fist type.

The frame type caliper has high rigidity,
There is an advantage that the brake pad can be easily taken in and out. This frame type caliper is a split caliper generally divided into an inner frame (a side having a cylinder portion) and an outer frame. The reason why the frame-type caliper is divided is that since the frame-type caliper has a frame shape, it is difficult to machine the cylinder part unless the caliper is divided.

As shown in FIGS. 12A and 12B, a disc brake frame type split caliper 10 is shown.
0 is a bridge portion 1 straddling the outside of the disk rotor 102
From 04, an inner frame 100A and an outer frame 100B are divided into two on both sides of the disk rotor 102, and the inner frame 100A and the outer frame 100B are inserted through the joint surface of the bridge portion 104 in the axial direction of the disk rotor 102. Are connected by a plurality of connecting bolts 106.

[0005]

The frame-type split caliper 100 is cast and has many cast parts due to splitting, which is disadvantageous in weight. Therefore, a large number of processing steps and assembling steps are required.

The present invention has been made in consideration of the above facts, and has as its object to provide a disc brake split caliper capable of reducing the number of parts and weight, thereby reducing the number of processing steps and assembly steps. is there.

[0007]

According to a first aspect of the present invention, there is provided a split type caliper for a disc brake, comprising a base portion floatingly supported by a vehicle body and a pair of bridge portions provided integrally with the base portion and straddling a disk rotor. An inner frame having a friction material pressed against the disk rotor and a metal plate supporting the friction material, and an outer frame attached to a first end of the bridge portion by a connecting means. It is characterized by:

[0008] The invention described in claim 2 is the first invention.
In the disc brake split caliper described in
A squeal preventing means is provided which has an insertion portion through which the connecting means is inserted and which is attached to the outer frame by fastening the connecting means and which prevents brake squeal.

[0009]

According to the disc brake split caliper of the first aspect, the base of the inner frame is floatingly supported by the vehicle body. An outer frame is attached by a connecting means so as to be connected to one ends of a pair of bridge portions which straddle a disk rotor provided integrally with the base portion. As a result, the ends of the bridge portions are connected to each other by the outer frame, and a frame-shaped split caliper is completed.

[0010] Since the outer frame is formed of a metal plate, the weight of the outer frame is lighter than that of a cast outer frame having the same strength.

In the caliper according to the second aspect of the present invention, the connecting means is inserted into the insertion portion of the squeal preventing means, and the squeal preventing means is attached to the outer frame by fastening the connecting means. The brake squeal (vibration) of the outer frame caused when the friction material is pressed against the disk rotor by the brake operation is attenuated by the squeeze prevention means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG.
Is the rotating disk rotor 12, the inner frame 1
A caliper 18 including an outer pad 16 as an outer frame and an inner pad 20 are provided.

The inner frame 14 is supported at one side of the disk rotor 12 by a caliper mounting fixed to a vehicle body (not shown) via a pair of sliding pins (both not shown) so as to be cantilevered in a floating manner. And slides along the sliding pins.

The inner frame 14 has a base 14A supported by a sliding pin, and a pair of bridges 14 provided integrally on both sides of the base 14A and straddling the disk rotor 12.
B and a cast product of iron or the like having a substantially U shape.

The base 14A has a cylinder hole 22 opening at the center on the disk rotor 12 side.
Cup-shaped piston 24 inserted into the cylinder bore 2
2, a liquid chamber 26 defined at the bottom, an inlet port (not shown) for introducing the pressurized hydraulic fluid into the liquid chamber 26, and a brewer screw for discharging air in the hydraulic fluid are provided. I have.

Each pair of bridge portions 14B is machined at its tip end, and has a screw hole 28 at the center.

An inlet port (not shown) of the inner frame 14 is connected to a known hydraulic master cylinder (not shown) via a brake hose so that the hydraulic fluid generated in the hydraulic master cylinder by the brake operation is introduced into the fluid chamber 26. It has become. When the pressurized liquid is introduced into the liquid chamber 26, the piston 24 makes the cylinder hole 22
Go forward to side 2.

As is well known, the inner pad 20 is formed by joining a lining 30 and a back metal 32 made of a steel plate or the like.

On the other hand, the outer pad 16 is formed by joining a back metal 34 and a lining 30. The back metal 34 of the outer pad 16 is a metal plate (for example, a steel plate).
Press-formed product, and both sides in the width direction are bent at a right angle to prevent bending deformation.

In the vicinity of both longitudinal ends of the back metal 34, bolt insertion holes 36 are formed at positions corresponding to the screw holes 28 formed in the inner frame 14.

Next, the procedure for assembling the caliper 18 will be briefly described. First, the inner frame 14 is cantilevered so as to be able to float on a caliper mounting fixed to a vehicle body (not shown) via a pair of sliding pins (both not shown). The piston 24 is inserted in the cylinder hole 22 of the inner frame 14 in advance.

Next, the outer pad 16 is attached to the bridge portion 14B of the inner frame 14 with two connecting bolts 38 (connecting means).

Next, the inner pad 20 is inserted and attached to a predetermined position between the base portion 14A and the disk rotor 12 together with a not-shown locking spring.

When the assembly is completed, the brewer screw is loosened and the air in the working fluid is discharged.

In the disk brake 10 assembled in this manner, when a brake pedal (not shown) is operated and pressure fluid is introduced into the liquid chamber 26, the piston 24 advances through the cylinder hole 22 toward the disk rotor 12 side. The inner pad 20 is pressed against one side of the disk rotor 12. Due to this reaction, the inner frame 14 is guided by a slide pin (not shown) while the disk rotor 12
Then, the lining 30 of the outer pad 16 is pressed against the other side surface of the disk rotor 12, and a braking action is performed.

Next, a comparison between the caliper 18 of the present embodiment and the caliper of the conventional example is shown in Table 1 below.

[0028]

[Table 1]

If the above Table 1 is described in detail, the reason why the number of machined surfaces for connecting the outer pad and the inner frame can be reduced as compared with the prior art is that in the present embodiment, the outer pad 16 can obtain a flat surface. This is because a press-formed product such as a steel plate is used (in the outer pad 16, it is not necessary to process a portion where the tip of the bridge portion 14B is in contact).

The reason why the connecting bolt 38 can be shortened is that, in the conventional example, as shown in FIG. 2, a bolt insertion hole 108 through which the connecting bolt 106 is inserted is formed by casting (the inner frame 100).
This is because the thickness of the casting near the hole could not be reduced due to the problem of strength due to the formation in A). On the other hand, in the present embodiment, as shown in FIG. 1, the bolt insertion hole 36 through which the connection bolt 38 is inserted is formed in a steel plate having strength as compared with a casting, so that the length of the bolt insertion hole 36 is Naturally, the length of the connecting bolt 36 can be shortened.

The reason why the weight can be reduced is that, in order to obtain the same strength, it is possible to reduce the weight by using a steel plate rather than by using a casting. That is, conventionally, the metal plate used on the outer side serves to support the lining 30, and the cast outer frame serves as the strength member, but in the present embodiment, the outer pad 16 is This is because the role of the strength member and the role of supporting the lining 30 are also used (that is, since there is no casting that connects the ends of the bridge portions 14B to each other). Furthermore, one of the reasons is that the connecting bolt 38 is short.

As described above, in this embodiment, the number of parts, the number of processing steps, and the size of the connecting bolt can be reduced, so that the manufacturing cost can be reduced. Also,
Since the weight can be reduced, it is also effective in reducing the unsprung load of the vehicle, improving fuel efficiency, and the like.

Second Embodiment FIG. 3 shows a second embodiment of the present invention.
And FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 3, a boss 40 is formed near the cylinder hole 22 in the inner frame 14 of this embodiment. This boss 40 has the outer pad 16
A bolt receiving hole 42 is formed on the side opposite to.

On the other hand, the outer pad 16 of this embodiment has a cutout 44 formed at the center on one side in the width direction, and a screw hole 44 formed at a position facing the bolt receiving hole 42.

The inner pad 20 has a protruding portion 20A formed at the center of one edge, and the protruding portion 20A has a bolt insertion hole 46 formed therein.

As shown in FIGS. 3 and 4, in this embodiment, the non-threaded portion 48A of the support bolt 48 is inserted into the bolt insertion hole 46 of the inner pad 20 and formed near the head 48C of the support bolt 48. The formed screw portion 48B is screwed into the screw hole 44 of the outer pad 16.

When the braking operation is performed, the outer pad 1
6 is the outer pad 1 with the bridge portion 14B as a fulcrum.
The shaft side (direction of arrow A) of the disk rotor 12 of No. 6 receives a force in a direction to open outward (direction of arrow B). For this reason,
The opposite side of the outer pad 16 (the side opposite to the direction of arrow A) receives a force inward (the direction of arrow C), but in this embodiment, the support bolt 48 receives this force. It is possible to prevent the outer pad 16 from opening when the brake is operated.

Other functions and effects are the same as those of the first embodiment. [Third Embodiment] A third embodiment of the present invention will be described with reference to FIGS.

The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 5A and 5B, a shim 50 is attached to the outer surface of the outer pad 16 in this embodiment.

The shim 50 is formed by attaching (or coating) an elastomer (for example, rubber) to one or both surfaces of a metal plate.

In the shim 50, a bolt insertion hole 52 as an insertion portion is formed at a position corresponding to the bolt insertion hole 36 of the outer pad 16.

The connecting bolt 54 of this embodiment has a head 54
A non-threaded portion 54C having a predetermined length and having a larger diameter than the threaded portion 54B is provided near A.

In this embodiment, the outer bolt 16 and the shim 50 are superimposed on the bridge portion
Installed with

By tightening the connecting bolt 54, the back metal 34 of the outer pad 16 is securely held between the non-threaded portion 54C and the bridge portion 14B. On the other hand, the shim 50 is sandwiched between the back metal 34 of the outer pad 16 and the head 54A of the connection bolt 54 at both ends. However, since the non-threaded portion 54C is provided, the shim 50 is not more strongly sandwiched than necessary.

When the braking operation is performed and the lining 30 slides on the side surface of the rotor 12 (not shown in FIG. 5), a so-called brake squeal (vibration) may be generated.
In this embodiment, since the shim 50 provided with the elastomer is attached, the vibration of the outer pad 16 can be attenuated, and the brake squeal (vibration) during braking can be prevented.

When the connecting bolt 54 does not have the non-threaded portion 54C, the backing metal 3
The elastomer provided in 4 may be crushed, and the intended damping effect may be reduced. In the present embodiment, this can be prevented.

Since the connecting bolt 54 is inserted through the bolt insertion hole 36 of the shim 50, the shim 5
There is no loss of 0.

The shim 5 through which the connecting bolt 54 is inserted
Although the bolt insertion hole 36 is provided at 0, a U-shaped notch may be formed at both ends of the shim 50 instead of the bolt insertion hole 36. [Fourth Embodiment] A fourth embodiment of the present invention will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIGS. 6A and 6B, in this embodiment, the outer pad 16 and the inner frame 14
A shim 60 having substantially the same size as the distal end of the bridge portion 14B is sandwiched between the first and second bridge portions 14B.

The shim 60 has a bolt insertion hole 62 as an insertion portion, and the non-threaded portion 6 of the connection bolt 64 is formed.
4C passes through the bolt insertion hole 62. Although the connecting bolt 64 of the present embodiment has the same structure as the connecting bolt 54 of the third embodiment as shown in the figure, the non-threaded portion 64C
Has become longer.

By tightening the connecting bolt 64, the non-screw portion 64C comes into contact with the bridge portion 14B, so that the shim 60 is not pinched more than necessary.

In this embodiment, the transmission of the vibration of the outer pad 16 to the inner frame 14 can be blocked by the shim 60. The shim 50 described in the third embodiment may be attached to the outside of the outer pad 16 as a matter of course. [Fifth Embodiment] A fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The bridge portion 14B of the inner frame 14 of this embodiment has a machined surface 70 outside the vicinity of the tip. The bridge portion 14B has a screw hole 72 formed at right angles to the machined surface 70.

At both ends in the longitudinal direction of the outer pad 16 of this embodiment, mounting portions 16A are bent at right angles so as to face the machined surface 70 of the bridge portion 14B.
Are provided in the mounting portion 16A.
4 are formed.

In this embodiment, the shim 60 is held between the mounting portion 16A and the machined surface 70.

The non-threaded portion 64C of the connecting bolt 64 is inserted into the bolt insertion hole 62 of the shim 60 and the bolt insertion hole 74 of the mounting portion 16A. In this embodiment, the connecting bolt 64 is also used.
By tightening, the non-threaded portion 64C comes into contact with the bridge portion 14B, so that the shim 60 is not pinched more than necessary.

The operation of the shim is the same as that of the fourth embodiment. However, in this embodiment, the outer pad 16 and the bridge portion 14 are additionally provided by the mounting portion 16A and the machined surface 70.
Since B is abutted and connected and fixed, a part of the braking torque generated by the outer pad 16 is transmitted from the surface of the mounting portion 16A to the surface of the machined surface 70 during braking. Therefore, it is not necessary to transmit all the braking torque from the outer pad 16 to the bridge portion 14B by the connecting bolt 64 as in the first to fourth embodiments, so that the strength of the connecting bolt 64 is smaller than that in the first embodiment. The size can be reduced, and the weight can be reduced. The bridge 14
The braking torque transmitted to B is transmitted to the vehicle body via the inner frame 14. Sixth Embodiment A sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The bridge portion 14B of the inner frame 14 of the present embodiment has a machined surface 76 inside near the tip. The bridge portion 14B has a bolt insertion hole 78 formed at right angles to the machined surface 76.

Further, a screw hole 80 is formed in the mounting portion 16A of the outer pad 16 of this embodiment.

Also in this embodiment, the shim 60 is held between the mounting portion 16A and the machined surface 70.

The bolt insertion hole 7 of the bridge portion 14B
8 and the bolt insertion hole 62 of the shim 60
No. 4 non-screw part 64C is inserted. In this embodiment, since the non-screw portion 64C comes into contact with the mounting portion 16A of the outer pad 16 by tightening the connecting bolt 64, the shim 60 is not pinched more than necessary. The operation is the same as in the fifth embodiment.

The above-described shims 50 and 60 may be of an adhesive type or a non-adhesive type. In the conventional shim, it is sandwiched and fixed between the pad metal plate and the caliper claw portion. However, the shim is crushed by this, and there is a problem that the attenuation characteristic is difficult to be constant. However, in the third to sixth embodiments, since the shim does not collapse, the effects (spring effect, damping effect) of the coating agent and the adhesive itself appear on both the rubber coating shim and the adhesive shim. Easy to do.

In the third to sixth embodiments, a shim is used to attenuate the vibration of the outer pad 16. However, as a countermeasure other than the shim, for example, FIGS.
The following countermeasures can be taken.

In the embodiment shown in FIG.
A mass 90 is attached to the back metal 34 of No. 6 to prevent vibration by a mass damper effect.

In the embodiment shown in FIG. 10, a mass 90 is attached to the back metal 34 of the outer pad 16 via a spring 92 to prevent vibration by a dynamic damper effect.

In the embodiment shown in FIG. 11, a cover 94 is put on the back metal 34 of the outer pad 16, and small particles (for example, metal spheres,
Sand, ceramic balls, etc.) 96 are put in an appropriate amount, and vibration is prevented by a damper effect using friction.

[0069]

As described above, according to the disc brake split caliper according to the first aspect, since the outer frame is made of a metal plate, the cast caliper is smaller than that using the conventional cast outer frame. Has an excellent effect of reducing the number of parts and weight. In addition, the number of processing steps and the number of assembling steps can be reduced.

In the caliper according to the second aspect of the present invention, since the squeal preventing means is attached to the outer frame, the squeal (vibration) of the outer frame can be attenuated. In addition, since brake squeal and vibration of the outer frame can be attenuated, vibration transmission to the inner frame is attenuated,
Vibration to the vehicle body is prevented. Further, since the squeal prevention means is attached to the outer frame by inserting the connecting means into the insertion portion of the squeal prevention means, it is possible to prevent the squeal prevention means from falling off due to vibration.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disc brake using a divided caliper of a disc brake according to a first embodiment of the present invention.

FIG. 2 is a side view of a conventional disc brake.

FIG. 3 is a perspective view of a split caliper of a disc brake according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a split caliper of the disc brake shown in FIG. 3;

FIG. 5A is a perspective view of a main part of a split caliper of a disc brake according to a third embodiment of the present invention, and FIG. 5B is a sectional view of FIG. 5A.

FIG. 6A is a perspective view of a main part of a split caliper of a disc brake according to a fourth embodiment of the present invention, and FIG. 6B is a sectional view of FIG. 6A.

FIG. 7 is a perspective view of a main part of a split caliper of a disc brake according to a fifth embodiment of the present invention.

FIG. 8 is a perspective view of a main part of a split caliper of a disc brake according to a sixth embodiment of the present invention.

FIG. 9 is a side view of an outer frame according to another embodiment of the present invention.

FIG. 10 is a side view of an outer frame according to still another embodiment of the present invention.

FIG. 11 is a side view of an outer frame according to still another embodiment of the present invention.

FIG. 12 (A) is a perspective view of a split caliper of the conventional disc brake, and FIG. 12 (B) is an exploded perspective view of the split caliper of the disc brake shown in FIG. 12 (A).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Disc brake 12 Disk rotor 14 Inner frame 14A Base 14B Bridge part 16 Outer pad (outer frame) 18 Split caliper 30 Friction material 34 Back metal (metal plate) 38 Connection bolt (connection means) 52 Bolt insertion hole (insertion part) 62 Bolt insertion hole (insertion part)

Claims (2)

(57) [Claims] An inner frame having a base portion floatingly supported by a vehicle body and a pair of bridge portions provided integrally with the base portion and straddling a disk rotor; a friction material pressed by the disk rotor and the friction; And a metal plate for supporting the material, and an outer frame attached by a connecting means so as to be connected to one end of the bridge portion. 2. A squeal preventing means which has an insertion portion through which the connecting means is inserted and which is attached to the outer frame by fastening the connecting means and which prevents brake squeal. Disc brake split caliper.