JPH0215736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake. A disc brake includes a carrier fixed to a non-rotating member of the vehicle on one side of the disc, a carrier that straddles the outer periphery of the disc and is movable in the axial direction of the disc and is held by the carrier, and a pair of calipers arranged to sandwich the disc. When one of the pair of friction pads is pressed against one surface of the disk by a pressing mechanism equipped on the caliper, the displacement of the caliper itself caused by this reaction force presses the other friction pad against the other surface of the disk. , some are designed to perform a braking action.

In this type of disc brake, it is necessary to hold the friction pads so that they do not fall off and are movable in the axial direction of the disc. For this reason, conventionally, as shown in FIG. 18, a pair of pad support shafts are provided on the carrier, each extending in the axial direction of the disk straddling the outer periphery of the disk 4' and spaced apart from each other in the circumferential direction of the disk 4'. 1',
2', and a pair of friction pads 3' are held on the pair of pad shafts 1', 2'. This pair of pad support shafts 1', 2' consists of a main pin 1' located on the front side in the disk rotation direction (left side in Figure 18) and receiving torque F' generated during braking, and a main pin 1' on the rear side in the disk rotation direction (on the left side in Figure 18). It consists of a sub-pin 2' located on the right side in Fig. 18).

In the disc brake as described above, a force couple f' acts on the friction pad 3' during braking, but in the friction pad holding structure as described above,
As a result of the resultant force X' of the reaction force F' and the couple f' acting on the main pin 1', which is greater than the pressure F', the main pin 1' has no choice but to have a considerably large diameter. As a result, the attachment portion of the carrier to the main pin 1' must also be made more robust, which has caused the disc brake to become heavier and larger.

In addition, in the conventional friction pad holding structure, the carrier has to have a shape that extends considerably in the circumferential direction of the disc, which makes the disc brake even heavier and larger. I was getting used to it. That is, since the carrier is attached to a non-rotating member of the vehicle, it generally has a portion that extends substantially in the radial direction of the disk, but conventionally, in addition to this, it has a portion that extends long in the circumferential direction of the disk. As a whole, it was necessary to form at least a substantially L-shape.

Particularly in recent years, there has been a demand for lightweight and small size motors for motorcycles, but conventional motors have not been able to adequately meet these demands.

The present invention has been made in view of the above-mentioned circumstances, and it solves the mechanical problems with the conventional main pin and improves the arrangement of the pad holding part, and is lightweight and compact, and has a braking force that is particularly suitable for motorcycles. An object of the present invention is to provide a disc brake suitable for use in small vehicles that requires only a small amount of brake.

In order to achieve this object, in the present invention, the number of pad support shafts to be provided in the carrier that straddles the outer periphery of the disk is one, and this is used as a common pad support shaft for supporting a pair of friction pads. In order to prevent the pad from rotating due to a couple, a first support portion and a second support portion are provided, each of which is located radially inward from the outer periphery of the disk. Since these two support parts are arranged to sandwich the disk, they are separated at the disk part, and one of them is provided on the carrier and the other on the caliper.

With the above-described configuration, the couple generated on the friction pads during braking acts in a direction that reduces the reaction force acting on the common pad support shaft during braking. The common pad support shaft can be made small in diameter. In addition, the carrier can be shaped in a substantially straight line connecting the common pad support shaft and the pad support part on the rotation center side of the disk, that is, the shape of only the part of the conventional carrier that is attached to the non-rotating member of the vehicle. This eliminates the need for a portion that extends in the circumferential direction of the disk.

In a preferred embodiment of the present invention, each of the pad support portions located on the rotation center side of the disk is a shaft-shaped member. In another preferred embodiment, the pad support provided on the caliper is not a shaft-like member but is formed into a groove, and a corresponding back metal of the friction pad is inserted into the groove.

Furthermore, in another preferred embodiment of the present invention, the common pad support shaft and the pad support portion provided on the carrier also serve as holding means for holding the caliper on the carrier. According to yet another preferred embodiment, the common pad support shaft is shaped like a hollow sleeve, the inner periphery of which guides a guide pin for slidingly guiding the caliper to the carrier, and the outer periphery of which guides a pair of friction pads. It is designed to provide navigational guidance.

The present invention will be explained in detail below based on the drawings showing examples thereof.

In FIGS. 1 to 7 showing a first embodiment of the present invention, 1 is a disk, and a carrier 2 is disposed on one side of the disk (on the right side in FIG. 1).

This carrier 2 is fixed to a non-rotating member of a vehicle, for example, a front fork 3 of a motorcycle as shown in FIG. 7, using its mounting holes 2a and 2b. It has a straight line shape that extends in the radial direction. As shown in FIG. 6, a common pad support shaft 4 is fixed to the outer end of the carrier 2 in the radial direction of the disk and extends in the axial direction across the outer periphery of the disk 1. , a first pad support shaft 5 (see FIG. 1) extending in the axial direction of the disk 1 is fixed. This first pad support shaft 5 supports the disk 1
The padded guide portion 5a extending toward the disk 1
The caliper guide portion 5b extends in the direction away from the caliper guide portion 5b.

Bottomed cylindrical guide portions 6a and 6b formed on the caliper 6 are slidably fitted into the caliper guide portions 5b of the common pad support shaft 4 and the first pad support shaft 5, respectively, on one side of the disk 1. are combined. This caliper 6 straddles the outer circumference of the disk 1, and one side of the disk 1 is equipped with a known cylinder mechanism 7 as a friction pad pressing mechanism.
The other side of the disk 1 has a leg portion 6c extending toward the inner end in the radial direction. A second pad support shaft 8 extending in the axial direction toward the disk 1 is integrated from the tip of the leg 6c.

A first friction pad 9 is arranged on one side of the disk 1, and a second friction pad 10 is arranged on the other side of the disk 1. The back metals 9a and 10a of the first and second friction pads 9 and 10 have substantially semicircular recesses 9b and 10b that open radially outward at the radially outer end of the disk 1. , the recess 9b,1
0b is slidably fitted on the outer periphery of the common pad support shaft 4. A guide hole 9c is opened at the inner end in the disk radial direction of the back metal 9a of the first friction pad 9, and the guide hole 9c is slidable relative to the pad guide portion 5a of the first pad support shaft 5. They are mated. Further, a guide hole 10c is provided at the inner end of the back metal 10a in the disk radial direction in the second friction pad 10.
is opened, and the guide hole 10c is slidably fitted to the second pad support shaft 8.

In this way, the caliper 6 is connected to the common pad support shaft 4 and the first support shaft 5 (the caliper guide portion 5b).
Also, the first friction pad 9 is connected to the common pad support shaft 4 and the first pad support shaft 5 (the pad guide portion 5a thereof), and the second friction pad 10 is connected to the common pad support shaft 4 and the second support shaft. They are each guided and held slidably in the axial direction of the disk 1 via a shaft 8.

Next, the operation of the above configuration will be explained. First, when pressure oil is supplied to the oil chamber 7a of the cylinder mechanism 7, the piston 7b moves to the left in FIG.
Place the friction pad 9 on one side of the disk 1 (right side in Figure 1).
The reaction force causes the caliper 6 to move to the right in FIG.
This is done by pressing 0 onto the other surface of the disk 1.

During this braking, a braking torque F acts on the common pad support shaft 4 through both friction pads 8 and 9, as shown in FIG. , 8, a couple f acts on them. At this time, the resultant force X of the reaction force F of the braking torque on the common pad support shaft 4 and the couple F becomes smaller than the braking torque F, as is clear from the graphical solution of the forces. That is, the couple f acts to reduce the braking torque F.

9 to 11 show a second embodiment of the present invention, and the same components as those in the previous embodiment are given the same reference numerals and their explanations are omitted. The same is true).

In this embodiment, instead of providing the second support shaft 8,
A guide groove 6d extending in the axial direction of the disk 1 is formed in the leg portion 6c of the caliper 6, while a protrusion 10d extending in the axial direction away from the disk 1 is formed in a part of the back plate 10a of the second friction pad 10. Both 6d and 10d are bent and formed.
and are slidably fitted together. That is, the guide groove 6d is configured as a second support portion. With such a configuration, the center of the second friction pad 10 can be located approximately on the straight line connecting the common pad support shaft 4 and the guide groove 6d serving as the second support portion, and thereby the second friction The pad 10 can be held in a desirable stable posture.

The fitting portions of both friction pads 9 and 10 to the common pad support shaft 4 are semicircular recesses 9b and 10.
Instead of b, it is in the form of a guide hole.

In this way, if the second support part is the guide groove 6d formed in the caliper 6, the number of parts can be reduced compared to the case where the second support shaft 8 is separately provided. If the support shaft 8 is used as in the example, the effort required to process the caliper 6 is simplified.

12 to 17 show a third embodiment of the present invention, in which the common pad support shaft 11 is shaped like a hollow sleeve. A guide pin 12 is provided on the inner periphery of this hollow sleeve-shaped common pad support shaft 11 and protrudes from the caliper 6 on one side of the disk 1.
is slidably inserted, and the first and second
The friction pads 9 and 10 are slidably fitted into semicircular recesses 9b and 10b. With this configuration, the guide pin 12 can be slidably guided over a sufficiently long distance by the common pad support shaft 11 without interfering with the first and second friction pads 9 and 10. This makes it possible to stably hold the caliper 6 on the carrier 2.

Note that if the guide pin 12 is extended to the other side of the disk 1 and its tip is integrated with the leg portion 6c of the caliper 6, the rigidity of the caliper 6 will also be improved. Also, Calipa 6
is slidable on the first pad support shaft 6 via a separately provided sleeve 13.

As is clear from the above description, the present invention has the following features:
The diameter of the common pad support shaft, which corresponds to the conventional main pin, can be made smaller, and the carrier can also be made smaller, making it possible to significantly reduce the size and weight of the whole.

In particular, since the carrier can be formed into a substantially straight line extending in the radial direction of the disc 7, it can be used in cases where the entire disc brake is exposed to the outside, such as when applied to the front wheel of a motorcycle. Since the carrier itself is integrated with the non-rotating member (front fork) of the vehicle, it gives a sleek appearance and is therefore favorable from a design standpoint.

[Brief explanation of drawings]

Figures 1 to 6 show a first embodiment of the present invention, with Figure 1 being a front sectional view, Figure 2 being a plan view, Figure 3 being a left side view, and Figure 4 being a right side view. , 5th
The drawings are a sectional view taken along the line of FIG. 1, and FIG. 6 is a sectional view taken along the disk axis direction of the common pad support shaft portion. FIG. 7 is a diagram showing a case where the disc brake according to the present invention is applied to the front wheel portion of a motorcycle. FIG. 8 is a diagram showing the relationship between torque and couple during braking. 9 to 11 show a second embodiment of the present invention, in which FIG. 9 is a front sectional view;
FIG. 10 is a left side view, and FIG. 11 is a perspective view of the second friction pad. 12 to 17 show a third embodiment of the present invention, in which FIG. 12 is a front sectional view, FIG. 13 is a plan view, and FIG. 14 is a left side view.
FIG. 15 is a right side view, FIG. 16 is a cross-sectional view taken along the line -- in FIG. 12, and FIG. 17 is a cross-sectional view of the common pad support shaft portion along the disk axis direction. 1st
FIG. 8 is a diagram showing the friction pad holding structure of a conventional disc brake and the relationship between the torque and couple generated during braking. 1... Disk, 2... Carrier, 3... Front fork (non-rotating member of the vehicle), 4, 11...
...Common pad support shaft, 5...First support shaft (first support part), 6...Caliper, {6a...Guide groove, 8...
...Second support shaft} (second support part), 9...First friction pad, 10...Second friction pad, 13...Guide pin.

Claims (1)

[Scope of Claims] 1. A carrier fixed to a non-rotating member of a vehicle on one side of the disk; a caliper held on the carrier so as to straddle the outer periphery of the disk and be freely displaceable in the axial direction of the disk; and the disk. a first friction pad placed on one side of the disk, a second friction pad placed on the other side of the disk, and a common pad support that straddles the outer periphery of the disk, extends in the axial direction of the disk, and is fixed to the carrier. a first pad support portion provided on the carrier on one side of the disk and located radially inward from the outer periphery of the disk; provided on the caliper on the other side of the disk; a second pad support portion located radially inward from the outer periphery of the disk; the first friction pad is supported by the common pad support shaft and the first pad support portion; are held movably in the axial direction of the disk by the common pad support shaft and the second pad support portion, respectively. 2. The disc brake according to claim 1, wherein each of the first and second pad support portions is a shaft-shaped member. 3. Claim 1, wherein the second pad support portion is constituted by a guide groove formed in the caliper.
Disc brake as described in section. 4. Claim 2, wherein the common pad support shaft and the shaft-shaped first pad support portion are also used as a guide for holding the caliper movably in the axial direction of the disk with respect to the carrier. Disc brake as described. 5. The common pad support shaft is sleeve-shaped, and a guide pin protruding from the caliper in the axial direction of the disk is fitted into the sleeve-shaped common pad support shaft, and the sleeve-shaped common pad support shaft A disc brake according to any one of claims 1 to 4, wherein the first and second friction pads are slidably guided.