JPH0532841U - Disc brakes for vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent a magnet for magnetizing a friction pad housed and held in a recess formed in a friction pad pressing surface of a piston from falling off. [Structure] Locking portion 10 provided on the back surface of magnet holder 10
By engaging the elastic locking claw 10b of c with the locking hole 6d penetratingly formed in the bottom wall of the recess 6b formed in the friction pad pressing surface 6a of the piston 6, the magnet holder 10 is moved to the friction pad of the piston 6. The concave portion 6b formed on the pressing surface 6a is fitted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake used in various traveling vehicles such as motorcycles, and more particularly to a vehicle disc brake in which a friction pad is magnetically attached by a magnet provided in a piston.

[0002]

[Prior Art]

 A vehicle disc brake is known in which a concave portion is formed on a friction pad pressing surface of a piston inserted in a cylinder hole of a caliper, and a magnet for magnetically attaching the friction pad is housed and held in the concave portion (Actual opening number: 64-24734). (See the official gazette).

In such a vehicle disc brake, since the friction pad is magnetically attached to the friction pad pressing surface of the piston, it is possible to easily insert the disc rotor between the friction pads, for example, when the wheel is attached or detached. Have the advantages of.

[0004]

[Problems to be solved by the device]

 However, in the conventional vehicle disc brake described above, a depression is formed on the pressing surface of the piston, and a spacer containing a magnet is press-fitted and held in the depression, so the temperature of the piston rises due to frictional heat during operation. When doing so, there is a problem that the spacer containing the magnet comes off due to the difference in thermal expansion between the piston and the spacer.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle in which a magnet for magnetizing a friction pad is contained in a recess formed in a friction pad pressing surface of a piston. The purpose of the present invention is to provide a structure for a disc brake for use in which a magnet is held in a stable state and there is no risk of falling out.

[0006]

The present invention is for a vehicle in which a concave portion is formed in a friction pad pressing surface of a piston inserted in a cylinder hole of a caliper, and a magnet for magnetically attaching the friction pad is housed and held in the concave portion. In a disc brake, a locking member is formed by penetrating a locking hole in the bottom wall of the recess, and an elastic locking claw is projectingly provided on the back surface of the magnet housing portion. The elastic holding claw is inserted into the locking hole, and the magnet holding body is engaged and held.

[0007]

[Action]

 According to this structure, the elastic locking claw protruding from the back surface of the magnet housing is inserted into the locking hole formed in the bottom wall of the recess formed on the friction pad pressing surface of the piston to lock the elastic locking claw. The engagement with the holes prevents the magnet holder from coming off.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example in which the present invention is applied to a vehicle disc brake having an opposed piston type caliper. The caliper 1 is a disc rotor 2 that rotates integrally with wheels. A pair of action parts 3, 3 are arranged on both sides so as to face each other, and are connected at both sides of a bridge part 4 straddling the outer circumference of the disc rotor 2 to cylinder holes 5, 5 provided opposite to the action parts 3, 3. The pistons 6 and 6 are respectively inserted.

A ceiling opening 7 is formed in the bridge portion 4, a hanger pin 8 is installed in the ceiling opening 7, and the hanger pin 8 is arranged on both sides of the disc rotor 2 in the disc rotor axial direction. Friction pads 9, 9 that can be moved to are suspended. The friction pads 9 and 9 are composed of a lining 9a and a back plate 9b made of a magnetic material.

Further, a cylindrical recess 6b is formed on the friction pad pressing surface 6a of each piston 6, a locking hole 6c is formed through the center of the bottom wall of the recess 6b, and a magnet holder 10 is formed in the recess 6b. Is installed.

The magnet holder 10 is made of a hard synthetic resin, and a locking portion 10c having a plurality of elastic locking claws 10b radially protruding laterally is provided on the back surface of the disk-shaped magnet housing portion 10a. A disk-shaped magnet 11 having a structure and having a strong magnetic force, for example, a rare earth magnet or the like, is fitted and housed in the magnet housing portion 10a, and a thin cover piece 10d for preventing removal is provided on the surface side of the magnet 11. It is formed integrally toward the inside.

The magnet holder 10 is fitted into the recess 6b by inserting the locking portion 10c into the locking hole 6d and engaging the elastic locking claw 10b with the locking hole 6d.

With this configuration, since the friction pad 9 is always magnetically attached to the friction pad pressing surface 6a of the piston 6, the friction pad 9 retracts as the piston 6 retracts, 9 can be prevented from being dragged. Further, since the space between the friction pads 9 and 9 is open, the disc rotor 2 can be easily inserted between the friction pads 9 and 9 when, for example, attaching or detaching a wheel or replacing the friction pad 9.

In particular, the magnet holder 10 is fitted and housed in the recess 6b formed on the friction pad pressing surface 6a of the piston 6, and the engaging portion 10c provided on the back surface of the magnet holder 10 is engaged with the engaging hole. Since the magnet holder 10 is securely held by being inserted into and engaged with the magnet 6d, the temperature of the piston 6 rises due to frictional heat during braking, so that the temperature between the piston 6 and the magnet holder 10 is increased. Even if there is a difference in thermal expansion, there is no concern that it will come off.

Further, the magnet holder 10 accommodating the magnet 11 can be mounted by a simple operation of simply inserting it into the recess 6b, and the assembly is extremely easy.

Further, in this embodiment, since the magnet 11 is covered by the thin cover piece 10d of the holding body 10, the housing work is easy and does not fall out, and the magnet 10 is damaged because it does not come into direct contact with the friction pad 9. No worries.

[0018]

[Effect of the device]

 As described above, according to the present invention, the magnet holding body accommodating the magnet is fitted into the recess formed on the friction pad pressing surface of the piston, and the elastic locking claw protruding from the back surface of the magnet holding body is provided. It is accommodated and held by engaging with a locking hole that penetrates through the bottom wall of the recess, and the magnet can be easily and securely attached to the friction pad pressing surface of the piston, and the friction pad is always attached. Can be magnetically attached to the piston.

Therefore, it is possible to facilitate the insertion of the disc rotor between the friction pads when the wheels are attached or detached or the friction pads are replaced, and to prevent dragging during braking. Furthermore, even if there is a difference in thermal expansion between the piston and the holding body due to the frictional heat transmitted to the piston during braking, there is no concern that it will come off, and the friction pad can always be magnetically attached to the friction pad pressing surface of the piston. Is.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a disc brake showing an embodiment of the present invention.

FIG. 2 is a perspective view of a magnet holder.

[Explanation of symbols]

1 ... Caliper, 2 ... Disk rotor, 5, 5 ... Cylinder hole, 6, 6 ... Piston, 6a ... Pressing surface, 6b ... Recessed part, 6
c ... Locking hole, 9 ... Friction pad, 10 ... Magnet holder, 10
a ... magnet accommodating part, 10b ... elastic locking claw, 10c ... locking part, 11 ... magnet.

Claims (1)

[Scope of utility model registration request] 1. A disc brake for a vehicle, wherein a concave portion is formed on a friction pad pressing surface of a piston inserted in a cylinder hole of a caliper, and a magnet for magnetically attaching the friction pad is housed and held in the concave portion. A magnet holder having a locking hole penetratingly formed in the magnet accommodating portion and an elastic locking claw protruding from the back surface of the magnet accommodating portion is mounted in the recess by accommodating the magnet in the magnet accommodating portion, and the elastic locking is performed. A disc brake for a vehicle, characterized in that a pawl is inserted into the locking hole to engage and hold a magnet holder.