JP4031082B2 - Disc brake guide pin support structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a structure for supporting a guide pin of a caliper of a disc brake. The caliper is slidably supported by a reverse guide pin (a guide pin extending from the support to the side opposite to the brake disc). The reverse guide pin can be made lighter by reducing the diameter of the disc brake, and the caliper can slide smoothly by reducing its deflection, reducing uneven wear of the slide surface of the reverse guide pin and caliper. In addition, it is effective for reducing the caliper vibration accompanying the vibration of the vehicle body.
[0002]
[Prior art]
The disc brake that supports the caliper by the reverse guide pin is convenient for increasing the diameter of the brake disc because there is no guide pin radially outward of the brake disc, and is particularly used in large disc brakes. This is convenient for a large disc brake that drives a brake by an air chamber. An example of a caliper support structure using the reverse guide pin is described in JP-T-8-508080. An outline of the caliper support mechanism using the reverse guide pins will be described with reference to FIG.
A reverse guide pin 2 is screwed onto a threaded portion 1a of a support (support member) 1 and protrudes toward the opposite side of the brake disk 3. A caliper 4 straddling the brake disk 3 by the reverse guide pin 2 is It is slidably supported. The caliper 4 is movably supported by the support 1 by the reverse guide pin 2. As for the disc brake by the air chamber, when the load on the caliper is large and the guide pins are strongly squeezed, the left and right ears of the caliper are supported by the reverse guide pins. The conventional reverse guide pin supports the torsional force, brake torque, etc. due to the caliper's unbalanced load, but it protrudes from the support to the opposite side of the brake disc, and is fixed to the support in a cantilever shape. Because it is a thing, the bending is large. In order to reduce this bending, the diameter must be increased, and there is a problem that uneven wear of the reverse guide pin is promoted due to the bending.
[0003]
[Problems to be solved by the invention]
Therefore, for the purpose of reducing the weight and durability of the support mechanism for the reverse guide pin, the problem is to devise a mechanism for fixing the reverse guide pin to the support so that the deflection of the reverse guide pin can be reduced. To do.
[0004]
[Means for Solving the Problems]
Means taken to solve the above problems, a pair of tip of the reverse guide pin which projects on the opposite side of the brake disc from the support, are fixed separately to the support for each said reverse guide pins and the left and right reverse guide pin The supporting plate is supported by the support via a connecting plate and a support mounting bolt for fixing the support to the vehicle body side member.
[0005]
[Action]
The reverse guide pin is screwed at one end to the support, and a connecting plate whose tip is fixed to the support separately for the reverse guide pin and the left and right reverse guide pins, and a support mounting bolt for fixing the support to the vehicle body side member, Therefore, both ends are attached to one support. Therefore, the strength and rigidity of the reverse guide pin with respect to the bending moment are remarkably improved, the bending thereof is remarkably reduced, and the rigidity of the fixing mechanism of the reverse guide pin with respect to the support fixed to the vehicle body side member is improved. Therefore, the diameter of the reverse guide pin can be reduced to reduce the weight.
On the other hand, in order to support the both ends of the reverse guide pin on the support in this way, a support mounting bolt for fixing the support to the vehicle body side member is used. Only the connecting plate. Therefore, the support mechanism of the caliper with the reverse guide pin is reduced in weight, the uneven wear of the sliding surface between the caliper and the reverse guide pin is reduced, and the support to the caliper is stabilized.
[0006]
【Example】
Next, the first embodiment will be described with reference to FIGS.
The basic structure of the disc brake of the first embodiment is conventionally known, and the left and right reverse guide pins 31, 31 screwed to the support (support member) 30 are slidably supported by the ears 33 of the caliper 32. The support 30 is fixed to the vehicle body side member S by support mounting bolts 34.
An air chamber 35 is attached to the caliper 32, and its rod is connected to a lever 36 of an eccentric cam inside the caliper, and the disk is rotated by the air cam 35 via the lever 36. Activate the brake.
One end of the strip-shaped connecting plate 37 is fixed to the support 30 by the support mounting bolt 34, and the other end of the connecting plate is fixed to the reverse guide pin 31. Therefore, since the reverse guide pin 31 is supported by the support 30 via the connecting plate 37 provided separately for each of the left and right reverse guide pins , both ends thereof are supported by the same support 30. Thereby, the strength and rigidity against the bending moment are remarkably improved, and the rigidity of the fixing mechanism of the reverse guide pin with respect to the support fixed to the vehicle body side member is improved. Therefore, compared with the conventional reverse guide pin supported in the shape of a cantilever, its diameter can be reduced, and its deflection is reduced, and therefore, uneven wear of the reverse guide pin and the caliper ear bushing is reduced. Remarkably reduced.
4 to 5 show a second embodiment. This is the one in which the present invention is applied to a brake in which a support 30a is mounted on a vehicle body side member S by two support mounting bolts 34a, 34a on the left and right sides, and has a substantially triangular shape provided separately for each of the left and right reverse guide pins . The connecting plate 37a is attached to the support 30a by two support mounting bolts 34a, 34a.
Since the force F applied to the reverse guide pin 31 is dispersed to f ₁ and f ₂ and supported by the support mounting bolts 34a and 34a, the support force to the tip of the reverse guide pin 31 by the connecting plate 37a is greater than in the first embodiment. is large, the more the deflection of the reverse guide pin 31 is not small.
[0007]
[Effect]
As described above, according to the present invention, the tip of the reverse guide pin 31 is supported by the support via the connecting plate and the support mounting bolt, and both ends of the reverse guide pin 31 are supported. Since the strength and rigidity are remarkably improved and the bending thereof is remarkably reduced, the reverse guide pin can be reduced in diameter, the caliper support mechanism by the reverse guide pin 31 can be reduced in weight, and the reverse guide pin and this The uneven wear of the bush fitted to the caliper (the caliper ear bush) can be remarkably reduced.
Further, since the strength and rigidity of the reverse guide pin 31 are improved, the caliper vibration due to the vibration accompanying the traveling is reduced, and therefore the operation of the brake becomes stable and smooth. This is a great advantage of the present invention.
[Brief description of the drawings]
FIG. 1 is a front view of a first embodiment of the present invention.
FIG. 2 is a side view of FIG.
3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a front view of a second embodiment.
5 is a partially enlarged view of FIG. 4;
FIG. 6 is a plan view of a conventional example.
[Explanation of symbols]
1, 30, 30a ... support (support member)
DESCRIPTION OF SYMBOLS 1a ... Screw part 2, 31 ... Reverse guide pin 3 ... Brake disk 4, 32 ... Caliper 33 ... Caliper ear 34, 34a ... Support mounting bolt 35 ... Air chamber 36 ... Lever 37, 37a ... Connecting plate S ... Car body

Claims (2)

The tip of the reverse guide pins of the left and right which projects on the opposite side of the brake disc from the support and is supported on the support via the reverse guide pins and the left and right reverse guide pin connecting plate fixed separately the support for each Support structure for disc brake reverse guide pin. The tip of the reverse guide pins of the left and right which projects on the opposite side of the brake disc from the support, fixed the reverse guide pins and the left and right reverse guide pin connecting plate which is fixed to the support separately for the support to the vehicle body member A support structure for a reverse guide pin of a disc brake supported on the support via a support mounting bolt.

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