JPH0351525A - Disc brake - Google Patents

Abstract

PURPOSE:To prevent the eccentric abrasion in the circumferential direction of a frictional pad by installing a cylinder beam which is formed so as to surround a pair of frictional pads and an arm, in frame form, and installed in free sliding onto the cylinder side of a pin. CONSTITUTION:A pair of frictional pads 1 and 2 are arranged oppositely to the both surfaces of a disc. Arms 3a and 3b extending on the both sides in the facial direction of the frictional pad 1 are installed. Each pin 4 is installed on the arms 3a and 3b. A cylinder 7 is supported in shiftable manners in the axial direction of the disc by a cylinder beam 8. Therefore, the eccentric abrasion in the circumferential direction of the frictional pad due to the tilt of the cylinder can be prevented.

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to a disc brake used for vehicles etc.
In particular, the present invention relates to a frame-type, pin-slide type disc brake in which uneven wear of friction pads in the circumferential direction and radial direction is prevented.

"Conventional technology" Conventionally, disc brakes used in vehicles, etc.
A fiss 1-type caliper is known in which a caliper is arranged so as to straddle the disc, and the friction pad is pinched and pressed from the outer circumferential direction of the disc.

In addition, the cylinder is arranged to face the back side of the friction pad on the inch side, and the friction pad on the outer side is fixed to a frame-shaped caliper that is slidably attached to the stationary member in a direction perpendicular to the disc. The supporting cylinder is a frame-type cylinder that moves integrally with the frame-shaped caliper. Furthermore, this frame type is known as a pin slide type in which the frame-shaped caliber is fixed and supported by a bin that slides with respect to a stationary member, and a rail slide type in which it is supported by a rail. .

"Problems to be Solved by the Invention" The conventional disc brake described above had the following points to be improved.

In other words, with the fist type, the pressing pressure of the friction pad is stronger on the outer circumferential side of the disk due to its structure, and uneven wear of the friction pad in the radial direction of the disk is unavoidable.As friction progresses, the pressure on the cylinder increases. There was a tendency for the amount of oil fed to increase and the pedal stroke to become longer.

On the other hand, with the frame type, uneven wear of the friction pad in the radial direction does not occur, but the structure is such that the braking force on the outer side (the force in the circumferential direction that the disc exerts on the outer friction pad) is received by the caliper. Because of this, the caliper tilts during braking and the friction band wears unevenly in the circumferential direction of the disc.
It still had the same drawbacks as the fist type mentioned above.3 Furthermore, among the frame types, the rail slide type had the same disadvantages as the fist type.
Since the sliding part cannot be covered, there is a possibility that foreign matter may adhere to the sliding part or rust may form on the sliding part, preventing the caliber from sliding smoothly and causing malfunction. In addition, with the pin slide type, the pin that slides when fitted onto a stationary member is slightly deformed by the braking force, so the fitting becomes tight during operation, which also causes the problem that the caliper does not slide cleanly. there were.

The present invention was made in view of the above conventional problems, and is a frame type, pin slide type disc brake, which prevents uneven wear of the friction pads in the circumferential direction and radial direction, and prevents sliding. The object of the present invention is to provide a disc brake that operates smoothly without deformation of its members.

"Means for Solving the Problems" The disc brake of the present invention includes a pair of friction pads that are arranged oppositely on both sides of a disc, and one of the friction pads extends on both sides in the surface direction and extends in the direction toward the disc. A knuckle having a slidably supported arm and fixed to a stationary member, at least one hydraulic cylinder facing the back surface of one of the friction bands, and a position outside the outer diameter of the disk. a pin protruding from both sides of the arm in a direction perpendicular to the disk; and a pin extending from the hydraulic cylinder to surround the pair of friction pads and the arm in a frame shape, and sliding on the cylinder surface of the pin. and a freely attached cylinder beam, the other friction panod being slidably supported on the disc side of the pin with its back facing the inner surface of the cylinder beam. There is.

"Operation" According to the disc brake of the present invention, when pressure fluid is supplied to the cylinder, the friction butt on one side facing the cylinder is pressed against the disc by the piston of the cylinder, and this reaction force causes the cylinder to move away from the disc. The other friction pad is pressed against the other surface of the disk by the cylinder beam that moves away from the disk, and the other friction pad is pressed against the other surface of the disk, so the disk is sandwiched between the friction pads from both sides to exert braking force. be able to.

In the disc brake of the present invention, the friction pad on the opposite side of the cylinder, that is, the friction pad on the outer side, is supported by a pin protruding from a knuckle fixed to a stationary member. The beam does not tilt. Therefore, the friction 4f is not biased in the circumferential direction of the disk due to the inclination of the cylinder, unlike in the conventional case. Further, since the cylinder beam sliding against the nasocle fixed to the stationary member is not subjected to braking force, it does not deform during operation and slides smoothly.

``Example'' An example of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a front view of the disc brake, FIG. 2 is a view taken along arrow A in FIG. 1, and FIG. 3 is a view taken along arrow B in FIG.

6 In FIG. 1, reference numerals 1 and 2 indicate a pair of friction panots disposed oppositely on both sides of the disk. Moreover, the one indicated by the reference numeral 3 has arms 3a and 3b extending from both sides in the surface direction of the friction pads 1 and 1 on the inner side (the side opposite to the cylinder 7 described later), and is fixed to a stationary member. It is a knuckle provided. The friction panes 1 and 1 are arranged between the arms 3a and 3b of this nanocle 3 in the axial direction of the disc (vertical direction in Fig. 1).
It is slidably supported.

The arms 3a and 3b of the nanocle 3 are provided with pins 4 that protrude from both sides of the arms 3a and 3b in a direction perpendicular to the disk (in the downward direction in FIG. 1) at a position outside the outer diameter of the disk. ing. The pin 4 is located on the side of the head and printer 7, and the tip side is \3a. A bolt 5 is inserted into the arm 3a3b so as to extend across the disk through the bolt 5, and the bolt 5 is fitted onto the outer periphery of the head side of the bolt 5 and tightened by tightening the bolt 5. and a sleeve 6 fixed to the arms 3a, 3b.

A cylinder 7 is provided on the back side of the friction pad 1 with a piston 7a facing the back side.

The cylinder 7 extends from the cylinder 7 and includes a friction pad 1,
2 and is formed to surround the arms 3a and 3b in a frame shape and is slidably attached to the sleeve 6 of the pin 4.
It is supported by a linter beam 8 so as to be movable in the axial direction of the disk. Pis 1 and n7a of this nrinta 7 have
The friction pad 1 is removed by engaging the retainer spring 1a of the friction pad 1 inside.

On the other hand, the outer friction pad 2 is locked to the cylinder beam 8 by a retainer spring 2a so that its back surface is always in contact with the inner surface of the cylinder beam 8, and is slidably attached to the tip 5a of the bolt 5 of the pin 4. Supported. That is, as shown in FIG. 2, protrusions 9 and 10 are formed on the back metal 2b of the friction pad 2, projecting from both end faces in the surface direction. And the friction bat 2 is the back metal 2b
Both ends in the plane direction of the bolt 5 are fitted between the bolts 5, and the protrusions 98 and 10 are brought into contact with one side of the bolt 5 (the upper part in FIG. 2). The tip of the port 5 is held by the punt clip 11, which is elastically deformed so that the central portion is curved toward the one side (upward in FIG. 2) and is locked to the back metal 2b. It is attached to 5a and can slide freely against 5a.

Here, the friction pad 2 moves away from the projections 9 to 10 (downward in FIG. 2).
The width is narrow, so make sure to keep the protrusions 9 and 1o away from the holes 1 and 5 with the pad clip l1 removed (
It can be easily removed by pulling it out (upward in Figure 2).

In addition, there is a foot 1 at the sliding part of the pin 4 and the cylinder beam 8.
2.13 are provided respectively. Foots 12, 13
RE. is a cylindrical member that is expandable and retractable due to its bellows-shaped side wall, and is attached to cover between the printer beam 8 and the sleeve 6 to protect its sliding portion from foreign objects.
L is there.

9 Now, in the disc brake configured as described above, when the pressure branch is supplied into the cylinder 7, the friction pad 1 is pressed by the piston 7a against one surface of the disc arranged between the friction pads 12, Also, due to this reaction force, the cylinder 7 moves away from the disk (in both directions in FIG. Since the disk is pressed against the other surface of the disk, the disk is sandwiched between the friction surfaces F1 and F2 from both sides, and a braking force is exerted.

At this time, the braking force on the inch side (force in the circumferential direction acting on the friction pad 1 on the inch side) is directly received by the arm 3a or arm 3b of the knuckle 3.

Further, the braking force on the outer side (the force in the circumferential direction acting on the friction pad 2 on the outer side) is received by the arm 3a or the arm 3b via the holes 1 and 5. For example, when the rotational direction of the disk is as shown by arrow C in FIG. 1, the braking force is received directly on the inch side and by the arm 3a10 via the bolt 5 on the outer side.

The disc brake of this embodiment has the following effects.

That is, the disc brake of this embodiment is of a frame type, and uneven wear of the disc of the friction pad in the radial direction is prevented. Further, the braking force on the outer side is received through the bolt 5 of the pin 4 provided on the knuckle, and this braking force prevents the cylinder 7 or the cylinder beam 8 from tilting. Therefore, the friction pad does not wear unevenly in the circumferential direction of the disk due to the inclination of the cylinder, unlike in the conventional case.

Therefore, uneven wear of the friction pad in each direction is prevented,
This has the effect of reducing the amount of change in pedal stroke.

Further, since the cylinder beam 8 sliding against the knuckle 3 fixed to a stationary member is not subjected to braking force, the cylinder beam 8 slides smoothly without being deformed during operation.

Further, the cylinder beam 8, which is a caliper, is adapted to slide via a pin 4, and its sliding portion is completely covered and protected by a boot 12.13. Therefore, malfunctions due to foreign matter getting caught in this sliding portion will not occur.

In addition, since the bolt 5 serves both as a member for attaching the cylinder beam 8, which is a caliper, to the knuckle 3 and as a member for receiving braking force, there is no need to provide a member equivalent to a conventional carrier, and the number of parts is reduced. , cheap.

Furthermore, when replacing the friction pads 1 and 2, use the pad clip 1.
1 and the friction pad 2, move the cylinder 7 to the inner side (upwards in Figure 1) and use the gap between the disc and the friction pad 1 to remove the friction pad 1. This can be done by removing the piston 7a of the cylinder 7 and attaching the friction pads 1 and 2 in the reverse order. That is, it has the effect that the friction pad can be replaced very easily while attached to the disk without removing bolts.

"Effects of the Invention" 12 The disc brake of the present invention is a pin slide type that protects the sliding surface, a frame type that prevents uneven wear of the friction pad in the radial direction, and the braking force on the outer side is transferred to the knuckle. Since the cylinder is received through a pin provided in the cylinder and the cylinder is not tilted by the braking force, the friction pad does not wear unevenly in the circumferential direction due to the tilt of the cylinder as in the conventional case.

Further, the cylinder beam that slides against the knuckle fixed to the stationary member is not subjected to braking force.

Therefore, uneven wear of the friction pads in each direction is prevented, and changes in the pedal stroke are small, and malfunctions due to foreign matter getting caught in the sliding surface, etc., are prevented.
In addition, there is an effect that the movement is performed smoothly without deforming the members that slide during the movement.

[Brief explanation of drawings]

FIGS. 1 to 3 are diagrams showing embodiments of the present invention,
FIG. 1 is a front view of the disc brake, FIG. 2 is a view taken along arrow A in FIG. 1, and FIG. 3 is a view taken along arrow B in FIG. 13 1, 2...Friction pad, 3...Knuckle, 3a 3b...Arm, 4...Pin, 7...Night pressure cylinder, 8 Cylinder beam.

Claims (1)

[Scope of Claims] A disc includes a pair of friction pads that are disposed opposite to each other on both sides of a disk, and arms that extend on both sides of one of the friction pads in the surface direction and support the friction pad so as to be slidable in a direction toward the disk. , a knuckle fixedly provided with respect to the stationary member, at least one hydraulic cylinder facing the back surface of one of the friction pads, and extending from both sides of the arm in a direction perpendicular to the disk at a position outside the outer diameter of the disk. a cylinder beam extending from the hydraulic cylinder to surround the pair of friction pads and the arm in a frame shape and slidably attached to the cylinder side of the pin; A disc brake characterized in that the friction pad is slidably supported on the disc side of the pin with its back surface facing the inner surface of the cylinder beam.