JPH0542270Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a disc brake used in vehicles such as four-wheeled vehicles and motorcycles, and in particular, a floating brake that is guided so as to be movable in the axial direction of the disc. This invention relates to a disc brake for a vehicle that prevents uneven wear of friction pads provided on a type caliper.

[Conventional technology]

In the case of a disc brake equipped with a floating caliper that is cantilever-supported by a bracket on one side of the disc rotor, the reaction force side of the bracket that straddles the disc rotor tilts toward the rotation side in the circumferential direction of the disc rotor during braking. As a result, the friction pads may also tilt, causing uneven wear on the friction pads.
We proposed the technology shown in Publication No. 34326.

This technology provides three reaction claws on the reaction part of the caliper, forms a friction pad pressing surface on the inside of each reaction claw, and uses the pressure area of the reaction claw on the disk rotation side to By setting the pressure area smaller than the pressure area of the force claw, and when the caliper tries to tilt due to the bending moment, the reaction force claw on the disc rotation side is bent in the opening direction to increase the tilting of the caliper. This prevents uneven wear on the friction pads.

[The problem that the idea attempts to solve]

However, since the pressing area of each of the reaction pawls described above is limited to a certain size due to molding, the surface pressure applied to the friction pad is adjusted to correspond to the bending moment applied to the caliper during braking. It was not possible to change the distribution.

The present invention was developed against the background of the above circumstances, and an object of the present invention is to provide a vehicle disc brake that can change the surface pressure distribution applied to the friction pads in response to the bending moment applied to the caliper during braking. It is said that

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides an action part and a reaction part of a caliper that are movably guided in the disk axial direction, facing each other on both sides of the disc rotor, and a space between the action part and the reaction part. In a disc brake for a vehicle in which a pair of friction pads are arranged with a disc rotor in between, a plurality of female threaded holes extending in the disc circumferential direction in the disk axial direction are formed through the reaction part, and a threaded member is inserted into each female threaded hole. They are removably screwed together so that the tips of each screw member are brought into contact with the back surface of the friction pad on the reaction section side, and at least from the tips of the screw members on the disk insertion side and disk rotation side to the back surface of the friction pad on the reaction section side. The feature is that the mutual surface pressure applied to the caliper is set to be different in accordance with the bending moment applied to the caliper during braking.

Two or more screw members may be used as needed. In addition, as a means for varying the mutual surface pressure settings applied to the back surfaces of the friction pads on the reaction part side of the tips of the screw members on the rotation side and the rotation side of the disc rotor, in accordance with the bending moment applied to the caliper during braking, Examples include combining several types of screw members with different tip shapes serving as pressing areas, or staggering the amount of protrusion of each screw member or the position at which the female screw hole is formed.

[Effect]

With this configuration, when the caliper moves toward the action part due to reaction during braking, the tip of the screw member presses the friction pad on the reaction part side against the disk rotor instead of the inner surface of the reaction part.

At this time, the mutual surface pressure applied to the back surface of the friction pad on the reaction part side of the tip of the screw member on the disk rotation side and the disk rotation side is set to be different in accordance with the bending moment applied to the caliper during braking. This prevents uneven wear of the friction pads.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the disc brake 1, a caliper 3 provided straddling the disc rotor 2 is attached to a bracket 4 with an operating portion 3a disposed on one side of the disc rotor 2.
A caliper is supported by the support arm 4a extending from the bracket 4 via sliding pins 5, 5, and is further guided in its movement in the disk axial direction by the sliding pins 5, 5. As a floating type, Calipa 3 is
Action portion 3a located on one side of the disc rotor 2
, a reaction part 3b provided on the other side of the disc rotor 2 facing the action part 3a, and a bridge part 3c connecting the reaction part 3b across the outer periphery of the disc rotor 2.
It consists of

Friction pads 6, 6, each consisting of a lining 6a and a back plate 6b, are disposed between the acting portion 3a and the reaction portion 3b so as to be movable in the disk axial direction with the disk rotor 2 in between. This pair of friction pads 6, as shown in FIGS. 2 and 3,
The input side end 6c of the disk rotor 2 of each back plate 6b is connected to the action part 3a and reaction part 3 of the caliper 3.
Arms 3g and 3h on the rotation side of the disc rotor 2 in b
The output side end 6d of the disk rotor 2 of each back plate 6b is supported by the insertion of the hanger pin 13 installed between the brackets 4 and 4.
By being supported via a retainer 14 by a guide rail 4b formed in an L-shape on a supporting arm 4a, it is supported by the caliper 3 without falling off. Reference numeral 15 denotes a pad spring that urges the insertion side end portions 6c of the back plates 6b of the pair of friction pads 6 toward the hanger pin 13.

In the acting portion 3a, a piston 7 is inserted into each cylinder hole 3d in the disk axial direction, which is opened on the disk rotor 2 side and arranged in parallel in the disk circumferential direction.

A pair of notch grooves 3e, 3e that are open on the inner diameter side of the disc are arranged in parallel in the reaction portion 3b so as to form three reaction force claws.
Female threaded holes 12, 12 with a slightly larger diameter in the disk axial direction are formed in the inner part of e. The female screw holes 12, 12 formed through the disk in the circumferential direction are
Regardless of the presence of the cutout groove 3e, the reaction portion 3b may be provided with a circular cross section.

The female screw holes 12, 12 are provided with screw members 8, 8.
are removably screwed onto each other, and the tips of the screw members 8, 8 protruding inside the reaction part 3b are brought into contact with the back surface of the back plate 6b of the friction pad 6 on the reaction part 3b side, respectively.

A hydraulic chamber 10 is defined between the bottom of the cylinder hole 3d and the piston 7, and when pressure fluid is supplied to the hydraulic chamber 10 from a known hydraulic master cylinder (not shown), the piston 7 moves into the cylinder hole. 3d forward,
The insulator 11 fitted to the tip of the piston is
The friction pad 6 on the action part side is pressed against one side of the disc rotor 2 rotating in the direction of arrow A, and then, due to this reaction, the caliper 3 moves toward the action part 3a, and the tips of the screw members 8, 8 A braking action is performed by pressing the friction pad 6 on the side of the reaction part 3b against the other side of the disc rotor 2.

The screw member 8 has a shape similar to a set screw, with a male screw 8a formed on the outer periphery of a cylindrical body to be screwed into the female threaded hole 12, and a tool hanging hole 8b formed on the base end surface, as shown in FIG. The distal end surface 8c of the screw member 8 shown in FIG.
are formed in a small diameter area, and a fifth
The screw member 8 shown in the figure has a cylindrical body penetrated through a shaft hole 8f, and a distal end surface 8g formed in a ring shape. Further, the design of the tip end surface of the screw member 8 cannot be prevented from being changed, for example, by forming it into an ellipse or a square shape.

Then, the tip of each screw member 8, 8 is connected to the reaction part 3.
In order to set the mutual surface pressure applied to the back surface of the back plate 6b of the b-side friction pad 6 to be different in accordance with the bending moment applied to the caliper 3 during braking, the above-mentioned FIGS. The three types of screw members 8, 8, 8 shown in FIG. The tips of the screw members 8, 8 on the disk insertion side and the disk rotation side, which protrude from the inner surface 3f of the reaction part 3b, are provided in contact with the back surface of the back plate 6b of the friction pad 6, respectively.

The threaded member 8 screwed into the female threaded hole 12 may be prevented from loosening, such as by applying an adhesive or inserting a split pin therethrough.

The pressing areas of the tip surfaces 8c, 8d, and 8g are as follows when the disc brake 1 operates as described above.
As the friction pad 6 on the reaction part side moves in the disk rotation direction, a bending moment is generated in the caliper 3, and the caliper 3 tilts toward the disk rotation side (in the direction of arrow B in FIG. 3), and the reaction part 3b When the friction pad 6 is pushed, the friction pad 6 on the action part 3a side wears unevenly on the disc retraction side of the lining 6a, and the friction pad 6 on the reaction part 3b wears unevenly on the disc retraction side of the lining 6a. , is set in response to the above-mentioned bending moment, and when the caliper 3 tilts in the disk rotation direction during braking, the pressing position of the reaction part 3b is a position on the disk rotation side compared to the case where there is no screw member 8. As a result, uneven wear of both linings 6a, 6a is suppressed to a minimum.

As explained above, in this embodiment, the tip surfaces 8c, 8d, and 8g have different contact areas with the friction pad 6.
and a male screw 8 of the same diameter screwed into the female screw hole 12.
By appropriately combining and using the three types of screw members 8, 8, and 8 having a diameter according to the moment generated in the caliper 3 during braking, the surface pressure distribution applied to the friction pad 6 on the reaction part 3b side can be improved. By changing this, it is possible to prevent uneven wear of both linings 6a, 6a.

In addition, as another means of changing the surface pressure distribution, a plurality of screw members 8 having the same pressing area at the tips are used,
The mutual protrusion amount of the tips of the screw members 8 protruding from the inner surface 3f of the reaction part 3b may be adjusted between the disk rotation side and the rotation side. The screw member may be fixed by a lock nut on the back side of the reaction part 3b, and the tip thereof may be provided so as to protrude beyond the tip of the screw member on the disk rotation side.

Furthermore, as another means of changing the surface pressure distribution,
The position of the female threaded hole 12 can also be changed by shifting the position in the circumferential direction of the disk or in the radial direction of the disk.

In this embodiment, two screw members are provided, but three or more screw members are provided to accommodate the bending moment applied to the caliper during braking, at least on the disk retraction side and the retraction side. By setting different mutual surface pressures applied from the tip of the screw member to the back surface of the friction pad on the reaction part side, uneven wear of the lining can be effectively suppressed.

[Effect of idea]

As mentioned above, the disc brake of this invention has the following features:
An acting part and a reaction part of a caliper that are movably guided in the disk axial direction are provided opposite to each other on both sides of the disc rotor, and a pair of friction pads are arranged with the disc rotor sandwiched between the action part and the reaction part. death,
A plurality of female threaded holes extending in the disk axial direction are formed in the reaction section in the circumferential direction of the disk, and a threaded member is removably screwed into each female threaded hole, so that the tip of each threaded member is attached to the friction surface of the reaction section side. At the same time, the mutual surface pressure applied from the tips of the screw members on the disk retraction side and the disk retraction side to the back surface of the friction pad on the reaction part side is made to correspond to the bending moment applied to the caliper during braking. Since the friction pads are set differently, the surface pressure distribution applied to the friction pads can be changed in response to the tilting movement applied to the caliper during braking, and uneven wear of the lining can be effectively prevented.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a sectional view of the disc brake, Fig. 2 is a rear view, Fig. 3 is a partially cutaway plan view, Figs.
The figures are cross-sectional views in which screw members with different tip shapes are screwed into reaction parts. 1... Disc brake, 2... Disc rotor, 3... Caliper, 3a... Acting part, 3b...
Reaction part, 3f...Inner surface of reaction part 3b, 6...
...Friction pad, 6a...Lining, 6b...Back plate, 8...Threaded member, 8a...Male thread, 8c, 8
d, 8g... tip surface, 12... female threaded hole.

Claims (1)

[Scope of utility model registration request] An acting part and a reaction part of a caliper that are movably guided in the disk axial direction are provided opposite to each other on both sides of the disc rotor, and a pair of friction pads are arranged with the disc rotor sandwiched between the action part and the reaction part. In the disc brake for a vehicle, a plurality of female threaded holes extending in the disk circumferential direction and in the disk axial direction are formed through the reaction portion, and a female threaded member is removably screwed into each female threaded hole. The tips of the pads are brought into contact with the back surface of the friction pad on the reaction section side, and at least the mutual surface pressure applied from the tips of the screw members on the disk insertion side and the disk rotation side to the back surface of the friction pad on the reaction section side is reduced during braking. A vehicle disc brake characterized by having different settings corresponding to the bending moment applied to the caliper.