JPS589853B2 - Vehicle disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake for a vehicle, and more particularly to a carrier member fixed to a vehicle, a caliper member slidingly connected to the carrier member, and a caliper member attached to one side of a rotatable disc. an actuator for pressing a first friction pad to slide the caliper member against the carrier member and applying a second friction pad to the opposite side of the disk; a sliding connection therebetween having a pair of parallel pins slidable through holes in one of the members and fixed to the other of the members;
The present invention relates to a vehicle disc brake of the type in which brake drag is directly transmitted from at least one of the friction pads to the carrier member.

In disc brakes of the above-mentioned type, if a pair of said pins is designed to fit snugly and slidingly fit into the corresponding holes, an unavoidable difference between the distance between the pins and the distance between the corresponding holes may occur. Due to manufacturing errors and manufacturing errors in the parallelism of the pins and holes, variations occur in the sliding resistance when the brake is applied, and therefore variations occur in the braking effect of each wheel.

Furthermore, even if there is no manufacturing error between the distance between the pins and the corresponding distance between the holes, or manufacturing errors in the parallelism of the pins and holes, when the brake is applied strongly, the brake drag from the friction pad of the carrier member will be generated. The receiving portion is bent, which causes a difference in the distance between the pins and the distance between the holes and a deviation in the parallelism, and a catch occurs in the sliding movement between the carrier member and the carrier member.

Original invention (Patent No. 1062094.

In Japanese Patent Publication No. 56-1618), in order to solve the above-mentioned problem, at least one of the pins is inserted into an oversized hole, but the pin rattles in the oversized hole and causes noise. In order to prevent this from occurring, the outer periphery of the pin is formed with an elastic bushing, and elastic biasing means (
For example, springs).

The present invention aims to solve the above-mentioned problems with a simpler structure than the original invention.

The present invention includes a carrier member fixed to a vehicle, a caliper member slidingly coupled to the carrier member, and a first friction pad pressed against one side of a rotatable disc to bring the caliper member into the carrier. an actuator for sliding the member and applying a second friction pad to the opposite side of the disc, the sliding coupling between the caliper member and the carrier member being formed by a hole in one of the members; A vehicle disc of the type having a pair of parallel pins slidable therein and fixed to the other of the members, the braking force being transmitted directly from at least one of the friction pads to the carrier member. In the brake, at least the pin on the disc rotation side of the pair of pins includes an elastic push whose outer circumferential surface has a non-circular cross section, and the outer circumferential surface of the push is a plane including the center axis of both pins. perpendicular to and in close contact with the inner circumferential surfaces on both sides of the hole in a plane including the central axis of the pin including the push, and between the inner circumferential surfaces on both sides of the hole in a plane including the central axes of both pins. A gap larger than a gap between the respective brake drag force transmitting surfaces of the friction pad and the carrier member is provided.

The present invention is characterized in that the outer peripheral surface of the elastic push has a non-circular cross section, and the outer peripheral surface of the push is perpendicular to a plane containing the central axes of both pins, and that is a plane containing the central axes of the pin that includes the push. Since it is in close contact with the inner circumferential surface on both sides of the hole, as in the original invention, the elasticity of the hole biases the pin in the oversized hole to an eccentric position and prevents the pin from rattling in the oversized hole. There is no need to provide biasing means (for example, a spring), and the structure is simple.

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

The disc brake shown in Figure 1 is
It belongs to the general type described in Publication No. 8.

The brake is formed by a carrier member 10 and a caliper member 12.

The carrier member 10 is adapted to be secured to the frame of the vehicle by its downwardly extending portion (not shown) and has a pair of arms 14 that traverse a rotating brake disc (not shown).

The caliper member 12 has a crown portion 1 with a hole in the center.
6, the crown portion of which connects a front rim 18 and a rear rim 20 extending downwardly on either side of the disc.

The rear rim 20 of the caliper member is formed with a pair of hydraulic cylinders each housing a piston (not shown) which abuts a backing plate 21 of a direct actuation friction pad 22.

The backing plate 23 of the indirectly actuated friction pad 24 engages the front rim 18 of the caliper member.

The arms 14 of the carrier member 10 are formed with sliding surfaces 25, 27 which engage the sides of the backing plates 21, 23 of the friction pad.

Therefore, the palm rubbing pad is slidably fitted into the carrier member, and the drag force exerted on the friction pad when the friction pad is tightened against the rotating disk is directly transmitted to the carrier member.

Projections protruding from the pad backing plates 21 and 23 (not shown)
is slidably seated on a shoulder formed in the arm 14 of the carrier member and controls the radially inward displacement of the friction pad and preferably the radially outward displacement of the friction pad.

Alternatively, only one of the friction pads, preferably the direct-acting friction pad 22, is attached to the carrier member and the other pad is secured to the caliper rim 18 by its backing plate 23.

In this case, if the sliding connection described below is completely housed in one side of the disk as shown in FIG. 1 of Japanese Patent Publication No. 56-2618,
4 does not need to go beyond the periphery of the disk.

The dimensions of the pad backing plates 21 and 23 are as follows:
a sliding fit between opposing surfaces 25, 27, thereby
A gap X may exist between both side surfaces of the backing plate and the sliding surface on the arm 14.

Although this gap is greatly exaggerated in the drawing, it is actually extremely small.

The caliber member is slidably attached to the carrier member and when hydraulic fluid is introduced into the cylinder to force the direct actuation friction pads 22 to one side of the disc, the caliper member releases the caliper rim 20 from the disc. direction, the carrier member 10 slides against the indirectly actuated friction pad 24.
on the opposite side of the disc.

A pair of metal pins 26, 2B are provided as sliding connection means between the caliper part and the carrier part.

In the embodiment of FIG. 1, each pin has a resilient push 38.

Although one or both of the pins could be fixed to the carrier member and slid through the caliper member, in the illustrated configuration both pins 26,28 are fixed to the caliper member and slide within the carrier member. It is slidable through the holes 30, 32 in the member.

Each pin is secured to the caliper member by a tightening screw 34 passing through a hole in the caliper member.

A sealing boot 36 extending between the pin and the carrier member protects the sliding surfaces of the pin and carrier member and retains the pin in the hole when the caliper member is removed from the carrier member for cleaning. It is useful for

In the embodiment of FIG. 1, each of the holes 30 and 32 is such that a gap "yn" exists between the push 38 forming the outer circumferential surface of the pin and the wall of the respective hole.

The pin 28, which is the pin on the rotation side of the disk, may have a smaller gap than the other pin.

When a strong brake is applied and deformation occurs, it is the arm 14 on the disc rotation side that deforms, but the caliper part follows the deformed arm 14 of the carrier part, and the pin on the disc rotation side deforms. The relative position of 28 to hole 32 remains almost unchanged.

Therefore, the pin 26 on the disk insertion side shifts relative to its hole 30 due to this deformation.

The resilient push 38 protects the metal part of the pin and helps reduce impact loads and noise between the pin and the wall of the hole.

The gap size "y" is made larger than the gap size "x" for the following reason.

When the brakes are applied strongly, the friction pads 22 and 24 are effectively tightened between the disc and the caliper member 12.
As a result, the caliper part is dragged along with the friction pad by the disc.

The drag force that the friction pads 22 and 24 receive during braking is directly transmitted to the fixed carrier member 10 by the backing plates 21 and 23 engaging with the arms 140 and 25 of the carrier member on the disk rotation side. However, in order to ensure that there is little transmission through the sliding connection between either pin 26, 28 and its hole 30, 32, one side 26 or 28 of the pin with clearance y should be Before the backing plates 21, 23 of the pad can engage the walls of the holes 30 or 32, the surface 2
5 or 27 is necessary.

This condition is practically satisfied if the gap "y" is larger than the gap "x".

Of course, if the brake is of a type in which the pin is designed to receive drag on one side of the pad, the gap "x" will only be provided on the other side of the pad.

As shown in FIG. 2, the push 38' has a variable thickness and a cross-sectional inner diameter that is circular but an outer diameter that is non-circular.

In a direction generally perpendicular to the plane containing the two pins 26, 28, as shown in FIG. However, in a direction generally parallel to the plane containing the two pins 26, 28, the thickness of the pusher 38' decreases such that on each side there is a maximum Gap “y”
is left behind.

This configuration allows for some relative displacement between the axis of the pin and the axis of the hole in a direction approximately parallel to the plane containing both pins, but approximately perpendicular to the plane containing both pins. It will be blocked in that direction.

In the embodiment of FIG. 1, both the pin 26 on the disk insertion side and the pin 28 on the disk extraction side have a gap "y" between the push 38 forming the outer peripheral surface and the corresponding hole 30.32. However, the pin 28 on the disc rotation side is pushed 3.
It is also possible to omit the provision of the hole 8 and to fit the hole 32 tightly and slidably into the hole 32 without any gap.

The reason for this is that when the brakes are applied strongly, the carrier member moves relative to the carrier member together with the friction pad by the clearance dimension "x", and therefore the pin 28 also has an eccentricity of "X" with respect to the hole 32. However, since the arm 14 of the carrier member on the disk extraction side is deflected in the same direction as the movement of the caliper member, the deflection of the arm 14 causes the relative movement of the hole 32 in the same direction with respect to the main body of the carrier member. This is because the pin 28 and the hole 32 are relatively eccentric.

additional relationships Original patented invention (Patent No. 1062094).

(Refer to Japanese Patent Publication No. 56-2618), a carrier member for fixing to a vehicle, a caliper member slidably connected to the carrier member, and a first friction pad are arranged on one side of a rotatable disk. It has an actuator for pressing and sliding the caliper member against the carrier member and applying the second friction pad to the opposite side of the disc, and the sliding connection between the caliper member and the carrier member is provided on both members. a pair of pins slidable within one of the members and fixed to the other of the members, at least one of the pins being in an oversized hole in one of the members; A resilient bushing surrounding the pin is inserted between the oversized hole and the at least one pin, and resilient biasing means for biasing the at least one pin to an eccentric position within the oversized hole. A vehicle disc brake equipped with a disc brake for a vehicle, wherein at least one of the pins is always displaceable in the disc radial direction relative to the oversized hole without deforming the pushing. The present invention is an invention in which the main parts of the essential parts of the structure of the original patent invention are the main parts of the essential parts of the structure, It achieves the same purpose as the original patented invention.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of a vehicle disc brake in which the present invention is implemented. FIG. 2 is an enlarged partial cross-sectional view corresponding to the cross-section seen in FIG. 1. 10 stomach carrier member, 12... caliper member, 22.
24...Friction had, 26, 28...Pin, 30.32...Hole, 38.38'...Push.

Claims (1)

[Claims] 1 A carrier member to be fixed to the vehicle, a caliper member slidingly coupled to the carrier member, and a first friction pad pressed against one side of a rotatable disc to press the caliper member against the carrier member. The sliding connection between the caliper part and the carrier part includes an actuator for sliding and applying a second friction pad to the opposite side of the disc, and the sliding connection between the caliper part and the carrier part is made by sliding the part through a hole in one of the parts. A disc brake for a vehicle of the type having a pair of parallel pins movable and fixed to the other of the members, in which braking force is transmitted directly from at least one of the friction pads to the carrier member, Of the pair of pins, at least the pin 26 on the disk rotation side includes an elastic bushing 38 whose outer circumferential surface has a non-circular cross section, and the outer circumferential surface of the pusher extends along the center axis of both pins 26,28. In a plane that is perpendicular to the plane that includes the push and includes the center axis of the pin 26, it is in close contact with the inner peripheral surfaces on both sides of the hole 30, and in a plane that includes the center axes of both the pins 26 and 2B, it is close to the inner peripheral surface of the hole 30. A disc brake for a vehicle, characterized in that a gap y larger than a gap X between the respective brake drag transmission surfaces of the friction pad and the carrier member is provided between inner circumferential surfaces on both sides.