JP2009138810A - Disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake device having a simple constitution without causing slipping-out and falling-off of a magnet. <P>SOLUTION: This disc brake device 1 is provided for braking by frictional force by bringing brake pads 4 and 6 into pressure contact by operation of a piston with a disc rotor 3 interlocking with a wheel, and is constituted so that an opposed part 5 to the piston 8 of the brake pad 4 has a magnetic substance. The opposed part 5 can be magnetically attached to the piston 8 without separately arranging the magnet or without arranging a locking means etc. for the magnet, by making the piston 8 as an electromagnetic by feeding an electric current to a coil 9 wound around the outer periphery of the piston 8. Thus, the constitution is simplified, and the disc brake device 1 without causing slipping-out and falling-off of the magnet can be provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc brake device that performs vehicle braking.

2. Description of the Related Art Conventionally, as a brake device for braking a vehicle, a brake pad disposed on the vehicle side is pressed against a disk rotor interlocked with a wheel by the operation of a piston, and the vehicle is driven by frictional force generated between the disk rotor and the brake pad. Disc brake devices that perform braking are known. In such a disc brake device, a back plate of a magnetic body is provided on the piston side of the brake pad, a magnet is provided on the brake pad side of the piston, and the back plate is magnetically attached to the magnet (for example, Patent Documents). 1).
Japanese Utility Model Publication No. 5-32841

  However, in the conventional disc brake device, since it is necessary to fix the magnet to the piston that moves forward and backward, in order to prevent the magnet from falling off or dropping off due to piston movement or thermal expansion, for example, a magnet locking means Etc., and the structure becomes complicated.

  Accordingly, the present invention has been made to solve such technical problems, and an object thereof is to provide a disc brake device that does not cause a magnet to fall off or drop off with a simple configuration.

  That is, the disc brake device according to the present invention is a disc brake device in which the brake pad is pressed against the disc rotor interlocked with the wheel by the operation of the piston to perform braking by frictional force. The structure is characterized in that the piston is an electromagnet by winding a coil around the piston and energizing it.

  Thus, since the piston itself functions as an electromagnet due to the configuration in which a coil is wound around the piston and energized, a brake pad having a magnetic material is provided without providing a separate magnet or a means for locking the magnet. Can be magnetized to the piston. Therefore, the structure can be simplified and a disc brake device in which the magnets are not dropped out or dropped off can be provided.

  According to the present invention, it is possible to provide a disc brake device in which a magnet does not fall off or fall off with a simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic perspective view of a disc brake device according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view of the disc brake device according to the embodiment of the present invention. A brake device that is mounted on a vehicle and brakes the vehicle, and is disposed on each wheel.

  The disc brake device 1 includes a substantially disc-shaped disc rotor 3 that is attached to an axle and rotates integrally with a wheel, and a bridge portion 2 a that spans a part of the outer peripheral portion of the disc rotor 3. And a floating caliper 2 attached to the vehicle body so as to be slidable in the direction along the axis. A cylinder hole is formed in the inner wall on one side of the bridge portion 2a in the caliper 2, and a piston 8 that advances and retreats in the direction of the rotation axis of the disk rotor 3 according to the brake hydraulic pressure is accommodated in the cylinder hole. A brake pad 4 having a surface on the disk rotor 3 side as a friction surface and a back metal 5 joined to the surface on the piston 8 side is disposed through the back metal 5 on the tip end side of the piston 8. A brake pad 6 similar to the brake pad 4 is attached to the inner wall on the other side of the bridge portion 2a via a back metal 7 so as to face the brake pad 4 with the disc rotor 3 interposed therebetween.

  Here, particularly in the disc brake device 1 according to the present embodiment, a coil 9 is wound around the outer periphery of the piston 8, and the coil 9 is connected to a power source (not shown) so as to be energized, and the brake pad 4. The back metal 5 joined to the opposite side of the piston 8 is made of a magnetic material.

  In a vehicle equipped with such a disc brake device 1, when the driver operates the brake pedal, current is supplied to the coil 9, and the piston 8 becomes an electromagnet by the magnetic field generated in the winding axis direction of the coil 9. An attractive force due to a magnetic force is generated between the magnetic back metal 5 and the back metal 5 is magnetically attached to the piston 8 to achieve stable bonding. Then, the piston 8, the back metal 5, and the brake pad 4 are integrally moved forward to the outer surface 3 a side of the disc rotor 3 according to the operation amount of the brake pedal, and the caliper 2 is braked by the reaction of the operation of the piston 8. The brake pads 4, 6 are pressed against the outer surfaces 3 a, 3 b of the disk rotor 3, and the vehicle can be braked by the frictional force generated between the brake pads 4, 6 and the disk rotor 3. . On the other hand, when the brake is released, the brake pad 4 is retracted together with the retraction of the piston 8 by the operation of the brake pedal. Therefore, dragging due to the brake pad 4 staying can be prevented.

  Thus, according to this embodiment, the back metal 5 of the brake pad 4 can be magnetically attached to the piston 8 without providing a separate magnet or a locking means for the magnet. While simplifying, it can be set as the disc brake device which a magnet does not drop out or drop out.

  As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment. Although the example using the back metal 5 has been described, the portion of the brake pad 4 facing the piston 8 may be made of a magnetic material. Therefore, the portion of the brake pad 4 facing the piston 8 may contain magnetic powder or the like. Also good.

  Further, in the above embodiment, the example using the floating caliper 2 has been described. However, when the caliper 2 is fixed and the disk rotor 3 floats, or the brake pad 6 and the back metal 7 side of the above embodiment are pistons. The same applies when moving.

1 is a schematic perspective view of a disc brake device according to an embodiment. FIG. 2 is a partial cross-sectional view of the disc brake device shown in FIG. 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake apparatus, 3 ... Disc rotor, 4 ... Brake pad, 5 ... Back metal (opposing part), 8 ... Piston, 9 ... Coil.

Claims (1)

In the disc brake device that performs braking with friction force by pressing the brake pad by the operation of the piston against the disc rotor interlocked with the wheel,
The opposing part of the brake pad to the piston has a magnetic body,
Winding the coil around the outer periphery of the piston to energize the piston,
Disc brake device characterized by.

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