JPS58146731A - Disc brake - Google Patents

Abstract

PURPOSE:To prevent the generation of a vibrative noise due to a brake pad, by providing protrusions, which can acceptably support vibrating force when applied to the pad, in a pad spring supporting a pair of the brake pads to a torque member. CONSTITUTION:A brake disc is equipped with a torque member 1 having two arm parts 2 provided with a distance in the direction of rotation of a disc, caliper 4 fixed to a slide pin 5 slidably inserted into said parts 2, and a pair of brake pads 7 arranged to the inside of an arm part 4b of the caliper 4. This pad 7 is slidably supported to the member 1 by a pad spring 19. Then the spring 19 is constituted by a fixed element 20, pressing element 21 and connecting element 22, here protrusions 26 protruded to the upper of the element 21 are provided to the element 20, and movement of the element 21 in the radial direction of the disc is limited by this protrusion 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake, and more particularly to a pad spring interposed in a sliding portion between a torque member and a pair of brake pads.

Examples of conventional disc brakes include those shown in FIGS. 1 and 2. That is, numeral 1 in the figure is a torque member, and this torque member 1 straddles a disc that rotates together with the wheel, and is connected to bolts that are installed at appropriate intervals in the rotational direction of the disc. Fixed to the vehicle body side. Each arm 2 of torque member 1
are provided with holes 2ak extending parallel to the axial direction of the disk, and slide bins 5 fixed to the caliper 4 are slidably inserted into these holes 2&. The arm portion 4b of the caliper 4 is continuous from the base portion 4a so as to straddle the disc, similar to the arm portion 2 of the torque member 1, and an outer pad (as shown in the figure) serving as a brake pad is provided inside the arm portion 4b. and an inner pad 7 are provided.

Also, the caliper 4 arm portion 4b of both arm portions 2 of the torque member 1
A support surface 8 is provided on the opposite side, and via a pad spring 9 placed on this support surface 8,
The pair of brake pads are slidably supported on the torque member 1. As shown in FIG. 2, the pad spring 9 includes a fixing piece 10 that engages and fixes the pad spring 9 to the torque member 1, and ears 7a provided on both sides of the brake pad on the torque member 1 side. It consists of a pressing piece 11 that presses, and a connecting piece 12 that is integrally formed in communication with the fixed piece 10 and the pressing piece 11 and applies a spring force to the pressing piece 11 due to its rigidity. 11
The connecting piece 12 is continuously formed integrally.

Further, the fixed piece 10 has a floor portion 10a placed on the support surface 8, and stands up continuously from the floor portion 10a, and
A standing plate part 10b continuous to the connecting piece 12, a stopper 10c formed by bending a part of the inside of the standing plate part 10b upward on the opposite side of the floor part 10a, and a stopper 10c continuous to the floor part 10a downward. The apron 10d is made up of a folded apron.
A common notch 16 is provided in the continuous portion of d to avoid contact with the disc.
"" M 7 m of the brake pad 7 is placed on the top surface of the ear portion 7a, and the suppression piece 11 is placed on the top surface of the ear portion 7a.
The tips 11a bent into an arc shape at the lower ends commonly abut.

The connecting piece 12 is continuous in a U-shape above the fixed piece 10, that is, in a direction that intersects with the advance and retreat direction of the brake pad 7, and outward in the radial direction of the disc. The fixed piece 10 is continuous, and the suppressing piece 11 is continuous on the other side.

Therefore, due to the rigidity of the connecting piece 12, the brake pad 7
A spring force of the suppressing piece 11 is applied to press the . Therefore, when the brake pad 7 receives an excitation force, the excitation force acts in a direction intersecting the width S direction of the connecting piece 12, so that the stress acting in this direction causes the disc of the brake pad 7 to It restricts movement outward in the radial direction. In addition, the entire pad spring 9 is made of a corrosion-resistant material such as stainless steel, and presses the brake pad 7 with an appropriate pressing force while preventing corrosion of the sliding part, thereby exerting pressure against the torque member 1. This ensures smooth sliding of the brake pad 7 and reduces brake noise.

However, such a conventional disc brake pad spring has a structure in which the excitation force of the brake pad 7 inputted from the pressing piece 11 is received only by the rigidity of the connecting piece 12. The rigidity of the connecting piece 12 is determined by the cross-sectional shape in the width direction with a small moment of inertia of the area, and when this rigidity is increased, the spring force of the pad spring 9 increases, so the suppressing force of the excitation force also increases. At the same time, the drag torque of the brake pad 7 increases. Furthermore, the pad spring 9 becomes larger. Therefore, the spring force of the pad spring 9 cannot be made very strong, and therefore the connecting piece 12 is likely to be deformed by the excitation force of the brake pad 7.
There has been a problem in that the spring force of the pad spring 9 decreases early, which tends to cause vibration noise and the like due to the brake pad.

This invention was made by focusing on such conventional problems, and includes a torque member fixedly installed on the vehicle body side, and a disk that is slidably supported by the torque member and rotates together with the wheel. a pair of brake pads that pinch the brake pads; a fixed piece that is interposed between the sliding portion of the brake pads and the torque member and engages with the torque member to position it; and a fixed piece that presses the brake pads toward the torque member. a suppressing piece, and communicating with the fixed piece and the suppressing piece, and
In a disc brake equipped with a pad spring having a connecting piece continuous and integrally formed on both pieces, the fixed piece is provided with a protrusion that protrudes above the suppressing piece, and this protrusion allows the pressing piece to The disk is configured to restrict outward movement in the radial direction of the disk beyond a predetermined value. The purpose is to solve the above problem by normally holding down the brake pad with a weak spring force, and when an excitation force is applied to the brake pad, the excitation force is received by a protrusion provided on the fixed piece. It is said that

The present invention will be explained below based on the drawings.

FIGS. 3 to 8 are diagrams showing one embodiment of the present invention.

First, to explain the configuration, reference numeral 1 shown in FIGS. 3 and 4 is a torque member, and this torque member 11 straddles a disk (not shown) that is identified with a wheel and rotates together with the wheel. Two arm portions 2 are provided at appropriate intervals in the rotational direction of the disk (one is symmetrically placed on the left and right, and the arm portion on one side is omitted in the figure), and the two arm portions 2 are connected to each other on one side of the disk. A bolt (not shown in the figure) that is screwed into a screw hole 3a provided in the trunk 6,
The torque member 1 is fixed to a member on the vehicle body side, such as a knuckle. Each arm 2 of the torque member 1 is provided with a hole 2a extending parallel to the axial direction of the disk, and a slide bin 5 can be slid into the hole 2a on the side shown in the figure via a rubber sleeve 14. In addition, a slide bin is slidably inserted directly into the hole on the side not shown. Both slide pins 5 are each fixed to the caliper 4 by a bolt 15 screwed into one end in the axial direction. 16 is boots.

The caliper 4 is connected to the torque member 1 via the slide bin 5.
It consists of a base 4a that communicates with the tank, and an arm 4b that straddles the disk between the two arms 2 of the Turkmen 1, and the base 4a is provided with a cylinder (not shown) that opens in the direction in which the arm 4b extends. An outer pad 6 and an inner pad 7, which are rounded and grooved, are disposed inside the arm portion 4b. Although not shown, a piston is loosely fitted into the cylinder, and the outer peripheral surface of the piston has a
A seal 30 attached to the cylinder side slides into 4, and
A groove 2b facing a part of the outer circumferential edge of the disk is provided on the inner side of both arms 2 of the torque member 1 in the disk radial direction, and a groove 2b facing a part of the outer peripheral edge of the disk is provided on the inner side of both arms 2 of the torque member 1 in the disk radial direction. is provided with a support surface 8 for slidably supporting the outer pad 6 and the inner pad 7, respectively. Support surface 8
is formed to be parallel to the rotation axis of the disk and perpendicular to the radial direction of the disk, and a pad spring 19 is placed on this support surface 8, and the band spring 19 a pair of brake pads6.
7 is slidably supported on the torque member 1.

As shown in FIGS. 5 to 8, the pad spring 19 is placed on the support surface 8 of the torque member 1, and engages with the groove 2b of the arm portion 2 of the torque member 1 for positioning. A fixing piece 20, a suppressing piece 21 that commonly touches the upper surface of ears 6a and 7a provided on both sides of the brake pad 6.7 and presses the brake pad 6.7 toward the torque member 1; The fixing piece 20, the suppressing piece 21, and the connecting piece 22 are made of stainless steel or rust-free springs. Continuously made of corrosion-resistant material such as steel.

That is, one side of the connecting piece 22 is continuous to the upper center portion of the fixed piece 20, and the other side of the connecting piece 22 is continuous to the center portion of the pressing piece 21. The intermediate portion of the connecting piece 22 is bent 180 degrees outward in the disk radial direction, and the suppressing piece 21 is disposed in front of the fixed piece 20 . The pressing piece 21 has a gutter shape, and above the pressing piece 21 there is a protrusion 2 formed by bending both sides of the upper part of the fixing piece 20 laterally.
6 is coming. The gap between this protrusion 26 and the pressing piece 21 is
This appears as an allowable floating amount of the brake pad 6.7, and its value is set appropriately.

In addition, there are 20 fixed pieces, a standing plate part 20b continuous to the connecting piece 22 and facing the suppressing piece 21, and a floor part 20 connected to the standing plate part 20b and formed by bending vertically.
a, an apron 20d that is continuous with the floor part 20a and is bent on the opposite side of the standing board part 20b to be perpendicular to the floor part 20a, and a part of the inside of the standing board part 20b. A stopper 2 formed by bending the side opposite to the floor portion 20a.
It consists of 0c. Furthermore, a common notch 23 is provided in the floor part 20a and the apron 20d, which is continuous with the recess formed in the standing plate part 20b by folding out the stopper 20c. A part of the outer periphery is exposed, thereby preventing contact between the disk and the pad spring 19.

By placing the floor portion 20a of the fixing piece 200 on the support surface 8 of the torque member 1 and engaging the stopper 20c with the groove 2b provided inside the arm portion of the torque member 1, the pad spring 19 is attached to the torque member 1. is positioned and fixed. The ears 6a and 7a of the outer pad 6 and the inner pad 7 are placed on the upper surface of the floor portion 20a, and the lower ends of the suppressing pieces 21 commonly abut on the upper surfaces of both ears 6a and 7a.

The outer pad 6 and the inner pad 7 are both composed of a spreading plate 24 and a friction material 25, which are each fixed with an adhesive or the like, and ears 6a and 7a are provided at both ends of the spreading plate 24, respectively. It is a provision.

Next, the action will be explained.

To assemble this disc brake, first place the pair of pad springs 19 with the floor part 20a of the fixed piece 20 on the support surface 8 of the arm part 2 of the torque member 1, and then place the pair of pad springs 19 on the stopper 2.
0c is engaged with the groove 2b inside the arm portion 2, thereby positioning it and attaching it to the torque member 1. Next, on both pairs of discs, each friction material 25 is directed toward the disc side, and the ears 6a, 7a on both sides are inserted between the fixed piece 20 and the pressing piece 21 of the pad spring 19, and the outer pad 6 is and the inner pad 7 is slidably supported on the torque member 1. After that, hold both pads 6゜7 and place the caliper (4) facing a part of the outer periphery of the disc, and attach the tip of the bolt 15 held on the base 4a of the caliper 4 to the arm part 2 of the torque member 1 in advance. This bolt 15 is screwed into the slide pin 5 slidably inserted into the hole 2a.
By tightening, the caliper 4 is fixed to the slide pin 5. Then, the torque member 1 is fixed to the vehicle body side member.

According to the disc brake assembled in this way, the suppressing piece 21 presses the brake pad 6.7 toward the torque member 1 side by the weak spring force applied by the connecting piece 22 of the pad spring 19, so that the brake Pad 6.
The drag torque of the brake pad 7 is small, so that the brake pad 6.7 can be smoothly moved forward and backward.

On the other hand, when braking, when brake fluid pressure is supplied from a mask cylinder (not shown) into the cylinder by operating a brake pedal (not shown), the piston moves to the distal side, and the inner pad 7 installed in front of the piston moves to the distal side. is pressed against one side of the disk, and at the same time, the caliper 4 moves in the opposite direction to the moving direction of the piston to press the outer pad 6 installed inside the arm 4b against the other side of the disk. As a result, a friction force is generated between the friction material 25 of both brake pads 6.7 and the disc, and the braking force generated thereby is transmitted from the plate 24 to the arm portion 2 of the torque member 1, and further from the trunk 3 to the arm portion 2 of the torque member 1. Braking action is performed by transmitting the signal to the vehicle body.

At this time, when the excitation force applied to the brake pad 6.7 is small, the excitation force can be absorbed by the suppression piece 21 provided by the rigidity of the connection piece 22, and the brake pad 6.7 is lifted up. can suppress shi. On the other hand, when the excitation force is large, the brake pad 6.7 rises against the rigidity of the connecting piece 22, but when the brake pad 6.7 moves outward in the disk radial direction by more than a predetermined distance, the pressure The piece 21 comes into contact with the protrusion 26v, and further movement of the suppressing piece 21 is restricted by the protrusion 26. Therefore, without increasing the size of the pad spring 19, the lift of the brake pad 6.7 can be kept within a predetermined distance. Can be suppressed and brake pads6.
It is possible to suppress the occurrence of the exhaustion sound caused by the 7. Moreover, since the amount of movement of the pressing piece 21 is small and the excitation force acting on the connecting piece 22 side is small, the connecting piece 22 does not deform, so the spring force of the connecting piece 22 can be maintained in its original state for a long period of time. The durability of the pad spring 19 can be greatly improved.

As explained above, the present invention includes a torque member fixed to the vehicle body, and a pair of brakes that pinch a disc that is slidably supported by the torque member and rotates by 1/C along with the wheels. A pad, a fixed piece that is interposed in a sliding part between the brake pad and the torque member, and that engages with and positions the torque member, a suppressing piece that presses the brake pad toward the torque member, and a fixed piece. and a pad spring having a connecting piece that is connected to the pressing piece and is continuously formed integrally with both the pieces, wherein the fixed piece is provided with a protrusion that projects above the pressing piece. This protrusion is configured to restrict the movement of the suppressing piece outward in the disk radial direction beyond a predetermined value.For this reason, the brake pad is normally held down by a weak spring force, and a large excitation force is applied to the brake pad. When the excitation force is applied, the excitation force can be directly received by the protrusion that restricts the movement of the suppression piece. Therefore, without increasing the size of the pad spring, under normal conditions, the suppression piece presses the brake pad with a weak spring force applied by the connection piece, so the drag torque of the brake pad can be reduced, and the brake The pad can be moved back and forth smoothly. On the other hand, when a large excitation force acts on the pad spring, the protrusion prevents the suppression piece from moving beyond a predetermined distance, so the brake butt, 9
It is possible to limit the lifting of the brake pad by a predetermined amount or more, and it is possible to obtain the effect that the generation of abnormal noises such as impact sounds caused by the brake pad can be suppressed. Moreover, since the amount of movement of the pressing piece is limited to a small amount, the force acting on one side of the connection can be suppressed to a small level, so that the connection piece does not deform (sag), and therefore the spring of the connection piece can be suppressed. Another effect is that the slope can be maintained in its original state for a long period of time, and the durability of the pad spring can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a front longitudinal sectional view of a conventional disc brake with one side omitted, Figure 2 is a perspective view of a conventional pad spring,
FIG. 3 is a front vertical sectional view showing one embodiment of the present invention with one side omitted, FIG. 4 is a partially sectional plan view, and FIG.
8 to 8 show the pad spring according to the present invention, FIG. 5 is a perspective view, FIG. 6 is a front view, and FIG. 7 is a front view.
The figure is a plan view, and FIG. 8 is a sectional view taken along the line ■--■ in FIG. 6. 1... Torque member, 2... Arm, 3... Executive,
4... Caliper, 4a... Base, 4b... Arm,
5...Slide bin, 6...Outer pad (brake butt), 7...Inner pad (brake pad)
), 6 a, 7 a... Ear portion, 8... Support surface, 19... Pad spring, 20... Fixing piece, 2
0a...floor part, 2ob...standing plate part, 20c...stopper, 20d...apron, 21...pressing piece, 22
・Connecting piece, 23...notch, 26...protrusion Patent applicant Nissan Motor Co., Ltd. agent Patent attorney Tetsuya Mori Patent attorney
Yoshiaki Naito, Patent Attorney Shimizu
Positive 1

Claims (1)

[Claims] A torque member fixed to the vehicle body side, a pair of brake pads that are slidably supported by the torque member and pinch a disc that rotates together with the wheel, and a sliding portion between the brake pad and the torque member. a fixing piece that is interposed in the and engages with the torque member to determine the position;
a pad spring having a suppressing piece that presses the brake pad toward the torque member, and a connecting piece that communicates with the fixed piece and the suppressing piece and is continuous and integrally formed with both pieces;
The disc brake is characterized in that the fixing piece is provided with a protrusion projecting above the pressing piece, and this protrusion restricts the movement of the suppressing piece outward in the disk radial direction beyond a predetermined value. disc brake.