JPH032012Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pad spring for a disc brake for a vehicle that resiliently supports friction pads that are disposed in a caliper to face each other across a disc rotor.

[Conventional technology]

Some conventional disc brakes for vehicles include a caliper in which friction pads that slide against a disc rotor are arranged, and a pad spring that acts as a damper by suppressing the reaction force of the friction pads due to braking action.

Figures 4 and 5 show an example of this type of disc brake, with a bracket 1 fixed to the vehicle body,
A caliper 3 supported movably in the axial direction of the disk rotor via a sliding pin 2 has an action part 3a in which a piston 5 is inserted into a cylinder 4, and a reaction part 3b having a reaction claw 6, which are connected to a wheel. The bridge portion 3c straddles the outer periphery of the disk rotor 7 that rotates integrally with the disk rotor 7.
Friction pads 9 and 10 are arranged to face each other with the disc rotor 7 in between, and two hangers are inserted through the mounting recess 8 and parallel to the disc rotor axis between the action part 3a and the reaction part 3b. pin 11,
11, and both friction pads 9, 1
0 is pressed inward in the radial direction of the disc rotor 7 by a pad spring 12 attached to the lower part of the bridge portion 3c.

This pad spring 12 has back plates 13, 14 of each friction pad 9, 10 on both sides of the connecting portion 12a.
Hanging arms 13a, 13a, 14 protruding from the top of the
It has four pressing pieces 12b, 12b, 12c, 12c that press the upper surfaces of a, 14a independently, and the pressing pieces 12c, 12c on the side of the reaction part 3b,
12c has a tongue piece 12d, 1 on the outer end on the friction pad 10 side to prevent the tongue piece 12d from coming off from engagement with the pad 10.
2d are bent toward the radial direction of the disc rotor 7, respectively.

[Problem that the invention attempts to solve] However, with the above-mentioned padded spring,
When assembling the friction pads 9 and 10 to the caliper 3, there is a risk that the friction pad 10 on the reaction part 3b side may be mistakenly assembled to the pressing pieces 12b and 12b on the action part 3a side of the pad spring 12 as shown in the figure. It was hot.

The present invention was developed against the background of this situation, and an object of the present invention is to provide a pad spring that prevents incorrect assembly of friction pads.

[Means for solving problems]

In order to achieve the above-mentioned purpose, the present invention has a pair of friction pads placed oppositely on both sides of the disc rotor, which are attached to the lower part of the bridge part of the caliper suspended by hanger pins inserted and placed parallel to the disc rotor axis. In a pad spring for a disc brake for a vehicle, which is equipped with a pressing piece that independently presses the upper surface of the disc rotor retraction and retraction side of each friction pad, the friction pad is attached to the pressing piece of the pad spring. At the front, a locking pawl is extended that protrudes into the hanger pin insertion path and retreats from the hanger pin insertion path when the friction pad is installed in the correct position and pushes the pressing piece toward the bridge portion. It is characterized by this.

[Effect]

According to the above configuration, when the friction pad is not inserted into the normal position of the caliper and protrudes into the hanger pin insertion path, the locking pawl of the pad spring prevents the hanger pin from being inserted, and the pressing piece is placed in the normal position. When pushed up toward the bridge part by the friction pad inserted into the hanger pin, the locking pawl retreats from the insertion path of the hanger pin, and the through hole of the friction pad is positioned in the insertion path of the hanger pin. It becomes possible to insert the

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

It should be noted that the same components as those of the above-mentioned conventional example are given the same reference numerals and detailed explanations will be omitted.

Padded spring 20 installed on Caliper 3
claw portions 20b are attached to both sides of the connecting portion 20a while holding the central rib 3d that protrudes from the lower part of the bridge portion 3c of the caliper 3 into the mounting recess 8;
Pressing pieces 20c, 20c, 20d that independently press the disk insertion and extraction sides of each friction pad 9, 10 inward in the radial direction of the disk rotor 7,
20d is provided.

Of these, the pressing pieces 20c, 20c disposed on the action part 3a side of the caliper 3 are pressed against the disk rotor 7 by the piston 5 during operation, and the friction pad 9 does not slide, while the hanging arm 13a of the back plate 13 , 13a while pressing the caliper 3, the pressure pieces 20d, 20d are longer than the pressure pieces 20d, 20d arranged on the reaction part 3b side.
At d, locking pawls 20e, 20e that protrude inward in the radial direction of the disc rotor 7 are bent on the side of the action portion 3a, respectively.

These locking claws 20e, 20e are connected to the friction pad 10.
Each locking pawl 20e serves to prevent incorrect assembly of the friction pad 10 and to restrict the amount of movement of the pad 10.
When not attached, the hanger pin 11 protrudes into the insertion path shown by the two-dot chain line in FIGS. 2 and 3.

That is, when attaching both friction pads 9 and 10 during pad assembly or maintenance of a disc brake, the friction pads 9 on the action part 3a side are normally placed by pushing up the pressing pieces 20c and 20c, while the friction pads 9 are placed on the reaction part 3b side. When the friction pad 10 is inserted with the upper hanging arms 14a, 14a inclined toward the pressing pieces 20c, 20c as shown by the two-dot chain line in FIG. Even if it can be inserted into the through holes 14b, 14b of the hanging arms 14a, 14a from the locking hole 21a, the tip will come into contact with the locking claw 20e that protrudes into the insertion path, preventing the friction pad 10 from entering normally. When it is inserted and the pressing pieces 20d, 20d are pushed up by the hanging arms 14a, 14a, the locking pawl 20e retreats from the insertion path of the hanger pin 11, and instead opens the insertion hole 14b, 14b in the insertion path. is located, and the locking hole 21
The hanger pin 11 inserted from b is inserted to the proper position where the tip reaches the locking hole 21b of the reaction part 3b.

Therefore, according to this embodiment, when the friction pad is inserted at an angle, the locking claw of the pad spring prevents the insertion of the hanger pin, making it impossible to assemble the friction pad and preventing incorrect assembly. be done.

[Effects of the invention] As described above, the present invention has a friction pad attached to the pressing piece of the pad spring that independently presses the upper surface of the disk rotor retraction and retraction side of each friction pad suspended by the hanger pin. A locking pawl is provided that protrudes into the hanger pin insertion path before installation, and retreats from the hanger pin insertion path when the friction pad is installed in the correct position and pushes the pressing piece toward the bridge portion. Therefore, if the friction pad is inserted at an angle, the locking claw will prevent the hanger pin from being inserted, and will only allow this if it is inserted correctly, preventing incorrect assembly of the friction pad, improving assembly workability and reliability. In addition to improving the durability, the locking pawl can restrict the amount of movement of the friction pad and prevent it from falling off.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Fig. 1 is a perspective view of the pad spring, Fig. 2 is a cross-sectional front view of the disc brake, Fig. 3 is a cross-sectional view taken from Fig. 2, Figs. 4 and 5 show a conventional example, and Fig. 4 shows a conventional example. 5 is a cross-sectional front view of the disc brake, and FIG. 5 is a cross-sectional view taken from FIG. 4. 3... Caliper, 3a... Action part, 3b... Reaction part, 3c... Bridge part, 4... Cylinder,
5...Piston, 6...Reaction claw, 7...Disc rotor, 8...Mounting recess, 9...Friction pad disposed on the action part 3a side, 10...Friction disposed on the reaction part 3b side Padded, 11... Hanger pin, 13, 14... Back plate, 14a... Hanging arm,
14b... Back plate 14 through which the hanger pin 11 is inserted
Through hole, 20... Padded spring, 20b...
Claw portion, 20c, 20d...pressing piece, 20e...locking claw.

Claims (1)

[Scope of utility model registration request] A pair of friction pads facing each other on both sides of the disc rotor are attached to the lower part of the bridge part of the caliper, which is suspended by hanger pins inserted and arranged parallel to the disc rotor axis. In a pad spring for a disc brake for a vehicle equipped with pressing pieces that independently press the upper surface on the retraction side, the pressing pieces of the pad spring protrude into the insertion path of the hanger pin before the friction pad is attached, A pad for a disc brake for a vehicle, characterized in that a locking pawl is extended to retreat from the insertion path of a hanger pin when the friction pad is mounted in the correct position and the pressing piece is pushed up toward the bridge part. spring.