JPH0469419A - Disk brake - Google Patents

Abstract

PURPOSE:To prevent a pawl side member from interfering with a wheel by providing the pawl side member with a caliper supporting part having a slide pin for supporting a caliper in a floating condition above a nonrotational part of a car body. CONSTITUTION:A caliper 28 is supported in a floating condition above a carrier 21 by a slide pin 29. A caliper supporting part 41 is provided in a pawl side member 37, and the caliper 28 is directly supported to the carrier 21 through the slide pin 29 provided in this caliper supporting part 41. Accordingly, a clearance (x) between the pawl side member 37 and a wheel 42 can be surely ensured by receiving not influences of work tolerance of a bolt hole and building tolerance between pawl side and cylinder side members through a bolt generated as in the past but an influence of only building tolerance of the slide pin 29. Consequently, the pawl side member 37 is prevented from interfering with the wheel 42.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc brake installed in an automobile or the like.

(Prior Art) Conventionally, as an example of a disc brake, there is a cylinder side member that supports a piston that presses an inner pad against the disc, a disc path part that contacts the cylinder side member and straddles the disc, and is connected to the disc path part. In addition, a caliper is constructed by integrally fixing a pawl side member consisting of a pawl portion that presses the outer pad with bolts, and this caliper is supported on a non-rotating part of the vehicle body so as to be movable in the axial direction of the disc. be. In this brake, iron-based material is used for the pawl side member that presses the outer pad to ensure great strength, and a light alloy such as aluminum alloy is used for the cylinder side member to make the caliper lighter and reduce the overall weight of the disc brake. I'm trying.

The cylinder side member is provided with a caliper support part having a slide pin, and by slidably fitting the slide pin into a hole formed in the non-rotating part of the car body, the caliper can be attached to the non-rotating part of the car body. It is in a floating state.

(Problem to be Solved by the Invention) Incidentally, in a disc brake, it is desirable that the pawl side member and the wheel be set with a predetermined clearance, but in the above-mentioned disc brake, the non-rotating part of the vehicle body is provided with a slide pin. Since the cylinder side member is supported by the cylinder side member and the claw side member is assembled to this cylinder side member via bolts, there is a risk that the claw side member may interfere with the wheel due to tolerances in hole machining and assembly. .

To solve this problem, it is possible to reduce the wall thickness of the claw side member of the caliper and increase the clearance between the claw side member and the wheel. A new problem arose in that the dispensability of the material deteriorated, making it impossible to obtain the large strength required for the claw side member, and this product was not suitable as a solution to the above-mentioned problems. .

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a disc brake that ensures sufficient strength of the pawl side member so that the pawl side member does not interfere with the wheel.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a cylinder-side member that supports a piston that presses one pad against a disk, and a disk path that abuts the cylinder-side member and straddles the disk. A caliper is constructed by fixing two members, a pawl side member consisting of a pawl portion and a pawl portion connected to the disc path portion and engaging the other pad, with bolts, and the caliper is placed in a floating state on a non-rotating portion of the vehicle body. A caliper support portion having a slide pin supported by the pawl side member is provided.

The cylinder side member may be formed of a light alloy material, and the claw side member may be formed of an iron-based material.

(Function) In the present invention, the claw side member is directly supported on the non-rotating part of the vehicle body via the slide pin. The attachment can support the claw side member without being affected by the above tolerance.

By forming the claw side member from an iron-based material and the cylinder side member from a light alloy material, the strength of the claw side member can be maintained high and the weight can be reduced. In this device, by using a slide pin made of iron-based material and attaching it to the claw-side member made of the same type of iron-based material, electrolytic corrosion (corrosion caused by electrochemical action) can occur between the slide pin and the claw-side member. )
never occurs.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

A carrier 21 fixed to a non-rotating part of the vehicle body (not shown) has a shape that straddles a disk 22 fixed to an axle (not shown), and has a pair of legs 23.23 provided in the rotational direction of the disk 22. And this pair of legs 23
．． 23 on the -111 side of the disk 22, and an outer beam 25 that connects them on the other side.

The leg portions 23.23 have torque receiving portions 23a, 23a for movably supporting the inner pad 26 and outer pad 27 in the axial direction of the disc 22, and for receiving torque from the inner pad 26 and outer pad 27 during braking. It is formed. In addition, holes 23b, 23b are formed in the leg portions 23.23 in the axial direction of the disc 22, into which slide pins 29.29 provided on the caliper 28 as described later are slidably fitted. ing.

The caliper 28 is a twist type, and the inner pad 26
A cylinder 31 is formed in which a piston 30 for pressing the disk 22 is slidably fitted, and the cylinder 3
a cylinder-side member 33 having a cylinder-side abutting part 32 formed in the upper part of the opening side of the cylinder-side abutting part 32; and a disc path part that straddles the disc 22 and has a claw-side abutting part 34 that abuts the cylinder-side abutting part 32. 35 and a claw side member 37 consisting of a claw portion 36 that engages with the outer pad z7, and the cylinder side contact portion 32 and the claw side contact portion 34 are brought into contact with each other and fixed by tie bolts 38 as described later. The structure is as follows. The claw side member 37 having the claw portion 36 which requires great strength in order to press the outer pad 27 is made of iron-based material such as FCD which has great rigidity, while the cylinder side member 33 which does not require great rigidity. The caliper 28 is made of a light alloy such as an aluminum alloy to reduce the weight of the caliper 28, thereby reducing the weight of the entire disc brake. Note that the cylinder side member 33 is lighter than the claw side member 37.

Four screw holes 39 are formed in the disk path portion 35 of the claw side member 37 along the axial direction of the disk 22, and screw holes 39 are formed in the cylinder side member 33 at four locations corresponding to the positions of the screw holes 39. A through hole 40 is formed along the axial direction. Then, by inserting the tie bolt 38 into the through hole 40, screwing it into the screw hole 39, and tightening it,
The cylinder side member 33 and the claw side member 37 are fixed.

The cylinder side abutment part 32 is recessed rearward (to the right in FIG. 3) toward the open four surfaces of the cylinder, excluding the area where the cylinder 31 is formed, and the corresponding claw side abutment part 34 has a caliper. The support portion 41.41 is the leg portion 23.41 of the carrier 21.
23, and a slide pin 29 made of an iron-based material that fits into the hole 23b of the carrier 21 is screwed and attached to this caliper support portion 41. By fitting the slide pin 29 into the hole 23b, the caliper 28 is supported by the carrier 21 in a floating state. Further, in this supported state, a disk path portion 35, which will be described later, is positioned with a gap X between it and the wheel 42.

In the disc brake configured in this way, the caliper 28 is supported in a floating state with respect to the carrier 21 by the slide pin 29, but the caliper support part 41 is provided on the claw side member 37, and the caliper support part 41 is provided on the claw side member 37. The caliper 28 is directly supported on the carrier 21 via the slide pin 29, and the assembly of the slide pin 29 is only affected by tolerances, and unlike conventional ones, the caliper 28 is directly supported by the carrier 21 via the slide pin 29. The assembly of the members and the cylinder side member is not affected by tolerances (and the gap X between the claw side member 37 and the wheel 42 can be ensured. Therefore, the claw side member 37 does not interfere with the wheel 42). That kind of thing doesn't happen.

In addition, in the conventional model, the claw side member, which is heavier than the cylinder side member, is fixed to the cylinder side member with a tie bolt.
A large load was applied to the tie bolts during vibration, but in this embodiment, the cylinder side member 33, which is lighter than the claw side member 37, is fixed to the claw side member 37 with a tie bolt 38, so that the load is not applied to the tie bolt 38 during vibration. The load can be reduced by this amount, and the tie bolt 38 can be made smaller.

In addition, in conventional models, the slide pin is made of iron-based material and is screwed onto the slide side member made of a light alloy such as a different type of aluminum alloy. However, in this embodiment, the slide pin 29 is made of iron-based material and is screwed onto the claw-side member 37 made of the same type of iron-based material. , electrical corrosion can be prevented from occurring in this area.

In this embodiment, the case where the support parts 41 and 41 and the claw side contact part 34 are made to protrude with respect to the cylinder opening surface A is taken as an example, but for example, the bolt 38 is positioned inside the caliper 28 and the support By forming the portion 41 into an L-shape, the claw-side contact portion 34 can be set at an arbitrary position.

(Effects of the Invention) The present invention has the advantage that the claw side member can be supported without being affected by the machining tolerances of the bolt holes used for assembling the cylinder side member and the claw side member, and the above tolerances. ,
This can reliably prevent the claw side member from interfering with the foil. Further, interference of the claw side member with the wheel can be achieved without reducing the wall thickness of the claw side member, and the strength of the claw side member can be maintained high.

Further, by forming the claw side member from an iron-based material and the cylinder side member from a light alloy material, the strength of the claw side member can be maintained high and the weight can be reduced. In this case, by using a slide pin made of iron-based material and attaching it to the claw-side member made of the same type of iron-based material, electrolytic corrosion will not occur between the slide pin and the claw-side member. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a disc brake according to an embodiment of the present invention, Fig. 2 is a plan view of the same disc brake, and Fig. 3 is a view taken along the line ■-■ in Fig. 2. It is a diagram. 21...Carrier, 22...Disk, 26-...
Inner pad, 27... Outer pad, 28... Caliper, 29... Slide pin, 33... Cylinder side member, 35... Disc path portion, 36... Claw portion,
37... Claw side member, 41... Caliper support part. Patent applicant: Tokico Co., Ltd. Representative: Patent attorney: Yumi Sae (2 idiots)

Claims (2)

[Claims] (1) A cylinder side member that supports a piston that presses one pad against the disk, a disk path portion that contacts the cylinder side member and straddles the disk, and a disk path portion that is connected to the disk path portion and engages with the other pad. A caliper is constructed by fixing two members, a pawl side member consisting of a pawl portion, with bolts, and a caliper support portion having a slide pin that supports the caliper in a floating state on a non-rotating part of the vehicle body is provided on the pawl side member. Disc brakes featuring: (2) The disc brake according to claim 1, wherein the cylinder side member is made of a light alloy material, and the pawl side member is made of an iron-based material.