JPH0632772U - Pad spring mounting structure for vehicle disc brakes - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the pad spring from accidentally falling off due to vehicle vibration or external force such as flying stones. The pad spring shape is simplified to reduce the number of assembling steps and to be manufactured at low cost. When attaching or detaching the friction pad, make sure the pad spring does not come off, and omit the reassembly work. [Structure] A pair of guide grooves 17, 17 that open to an end surface 4h of a bridge portion 4d are provided on both surfaces of a ceiling opening 4g on the disk entry and exit sides so as to face each other. Pad spring 1
6 are inserted from the opening side of the guide grooves 17 and 17, and the pad spring 16 is inserted into the ceiling opening portion 4.
g. The action portion side piece 4a and the reaction portion side piece 4b are connected to each other, the end surface 4h of the bridge portion 4d is closed by the reaction portion side piece 4b, and the pad spring 16 is prevented from coming off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pad spring mounting structure for elastically holding a friction pad of a disc brake used in a traveling vehicle such as an automobile or a motorcycle.

[0002]

[Prior art]

 Friction pads used for vehicle disc brakes may rattle due to running vibrations or may float toward the disc outer periphery during braking.Therefore, attach a pad spring to the bridge part of the caliper body to move the friction pad inward. An elastic material is known, and an example of a structure for mounting the pad spring is disclosed in, for example, Japanese Utility Model Publication No. 56-117135.

In this technique, a rectangular ceiling opening is provided in a bridge portion of a caliper body, and a pad spring formed in substantially the same shape as the ceiling opening is engaged with each of the outer surface and the inner surface of the ceiling opening. Locking pad and a pad restraining piece that presses the outer surface of the back plate of the friction pad, and the engaging arm divided into strips is wrapped around the hanger pin for hanging the friction pad to form a pad spring. Is attached.

[0004]

[Problems to be solved by the device]

 In such a structure, since the locking piece and the locking arm of the pad spring are simply hooked to the ceiling opening of the bridge and the hanger pin, an external force such as a flying stone is applied. In this case, the pad spring may fall off. Moreover, the number of assembling steps for the ceiling opening and the hanger pin is large, and the shape is complicated and the cost is high.

Further, since the shape is such that it is hung on the hanger pin, the ear pieces protruding on both sides of the back plate are fitted into the torque receiving recesses of the caliper bracket and the caliper body, and the friction pad is formed. It cannot be applied to the mounting type. In addition, the pad spring has to be reassembled every time the friction pad is replaced or removed for maintenance.

Therefore, the present invention provides a mounting structure of a pad spring for a disc brake which can be applied to an external force such as a flying stone or vibration of a vehicle body without dropping the pad spring and selecting a friction pad mounting type. Is intended.

[0007]

[Means for Solving the Problems]

 According to the first aspect of the present invention, in accordance with the above-mentioned object, the caliper body is a split type in which two split pieces that are split parallel to the side surface of the disc rotor are joined from one end of a bridge portion that straddles the outer side of the disc rotor. In the vehicle disc brake, the bridge portion is provided with a pair of friction pads arranged opposite to each other on both sides of the disc rotor in one of the split pieces. A pair of guide grooves that open to one end surface of the bridge portion are provided in the integrally formed bridge portion so as to face each other in the disc axial direction, and both end portions of the pad spring are inserted into the guide grooves through the openings of the end surfaces. The pad spring was attached to the guide groove and the end surface of the bridge was covered with the other of the split pieces to prevent the pad spring from coming off. It is characterized by a door.

Further, in the second invention, the caliper body is formed by connecting two divided pieces, which are divided in parallel to the side surface of the disc rotor, from an intermediate portion of the bridge portion straddling the outer side of the disc rotor. In the vehicle disc brake, which is a split type and has a pad spring that elastically inwardly pushes a pair of friction pads, which are arranged on both sides of the disc rotor, in the bridge portion, A pair of guide grooves that open to the end faces of each bridge part are provided in the divided bridge parts so as to face each other in the axial direction of the disc, and both end parts of the pad spring are inserted into the guide grooves through the openings of each end face. It is characterized in that the pad spring is retained by connecting the two divided pieces.

[0009]

[Action]

 According to both of the above-mentioned inventions, the pad spring is inserted into the guide groove from the end face of the bridge portion, and the opening of the guide groove is blocked by the connection of both pieces to prevent the pad spring from coming off.

[0010]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

In the disc brake 1, a caliper bracket 3 fixed to the vehicle body at one side of the disc rotor 2 and a caliper body 4 can be moved in the disc axial direction via a pair of slide pins 5 and 5. The caliper body 4, which is a pin slide type supported by the above, is configured by connecting the action portion side piece 4a and the reaction portion side piece 4b with four connecting bolts 6. The caliper bracket 3 is provided with a pad mounting concave portion 3a for mounting the friction pad 11 on the operating portion side, which is opened on the outer side in the radial direction of the disk. The slide pins 5 and 5 are fixed to the base end by caulking, and project in the direction opposite to the disc rotor.

In the acting portion side piece 4a, the acting portion 4c arranged on one side of the disc rotor 2 and the entire bridge portion 4d straddling the outer periphery of the disc rotor 2 are integrally formed by casting. In the reaction portion side piece 4b, the entire plate material such as a steel plate punched by a press machine is a reaction portion 4e arranged on the other side portion of the disc rotor 2. The two pieces 4a, 4b are brought into contact with the reaction portion side piece 4b and the end surface of the bridge portion 4d, and the connecting bolt 6 is screwed from the outer surface of the reaction portion side piece 4b to the action portion 4c side through the bridge portion 4d. Assembled together.

A cylinder hole 7 is provided at the center of the action portion 4c, and insertion holes 8 and 8 are provided on both sides thereof so as to open toward the disk rotor 2 side. A cup-shaped piston 9 is housed so as to be liquid-tight and movable, and a hydraulic chamber 10 is defined between the bottom wall of the piston 9 and the cylinder hole 7. The slide pins 5 projecting from the caliper bracket 3 are housed in the respective insertion holes 8, and the caliper body 4 can be moved in the disc axial direction to the caliper bracket 3 by both slide pins 5 and 5. Supported by.

Between the piston 9 and the reaction portion 4e, a pair of friction pads 11 and 12 including a lining 13 and a back plate 14 are arranged to face each other with the disc rotor 2 interposed therebetween. The friction pad 11 on the action portion side is arranged in the pad mounting recess 3a of the caliper bracket 3, and the friction pad 12 on the reaction portion side is arranged between the torque receiving protrusions 4f 1 and 4f 4 inside the reaction portion 4e. The friction pads 11 and 12 are disc-shaped by the two hanger pins 15 and 15 which are laid across the ceiling opening portion 4g formed in the bridge portion 4d and are bridged between the action portion 4c and the reaction portion 4e. It is suspended so as to be movable in the axial direction, and is urged inwardly of the disc by the elastic force of a pad spring 16 arranged in the bridge portion 4d.

The ceiling opening 4g has a large cutout from the end surface 4h of the bridge portion 4d so as to wrap the friction pads 11 and 12 below, in the approximate center of the bridge portion 4d above the friction pads 11 and 12. The notch is formed by closing the reaction portion side piece 4b joined to the end surface 4h. A pair of guide grooves 17 and 17 opening to the end surface 4h of the bridge portion 4d are provided opposite to each other on both sides of the ceiling opening 4g parallel to the disk axis on the disk entry and exit sides. The guide grooves 17 and 17 are located slightly above the hanger pins 15 and 15, and the length from the end surface 4h in the disc axial direction is slightly shorter than that of the ceiling opening 4g. .

The pad spring 16 is formed by gently bending the entire metal plate to one side and projecting two locking pieces 16a, 16a on both side edges thereof. The pad spring 16 is a friction pad. Before suspending 11 and 12, and before connecting both pieces 4a and 4b, guide edges 17b and 16b from the opening on the end face 4h side into the guide grooves 17 and 17 with the curved side facing the inner side of the disc. Inserted.

In the pad spring 16, the engaging pieces 16a, 16a on the insertion tip side are brought into contact with the side wall of the working portion of the ceiling opening 4g, or the end edges 16b, 16b are formed in the guide grooves 17, 17. The insertion of the pad spring 16 is regulated by contacting the side end of the pad spring 16, and the entire pad spring 16 is housed in the bridge portion 4d. Next, when the pieces 4a and 4b are connected, the end surface 4h of the bridge portion 4d is closed by the reaction portion side piece 4b, and the locking pieces 16a and 16a on the rear end side of the pad spring 16 are connected to the ceiling opening portion 4g. The inner surface of the reaction-part-side piece 4b, which serves as the reaction-part sidewall, contacts.

When the friction pads 11 and 12 are suspended by the hanger pins 15 and 15, the upper surfaces of the suspending portions 14 a and 14 a of the back plates 14 push up the pad spring 16 and the spring 16 Generates elastic force in the friction pads 11, 12 direction. Further, the engaging pieces 16a, 16a on both the front end side and the rear end side of the insertion contact the action part side wall of the ceiling opening 4g and the reaction part side piece 4b serving as the reaction part side wall, respectively, and the disc axial direction. It is regulated that there is no play.

In the present embodiment, as described above, the pad spring 16 is laterally inserted into the guide grooves 17, 17 formed in the bridge portion 4d to be attached, whereby the friction pads 11, 12 are attached. Since the pad spring 16 does not fall off even when the pad spring 16 is replaced or detached for maintenance, the work of reassembling the pad spring 16 can be omitted and the workability can be improved.

Further, since the pad spring 16 inserted into the guide grooves 17, 17 is prevented from coming off by utilizing the connection of the reaction part side piece 4b, it is not necessary to use a separate coming-off preventing member, which is economical. is there. Further, because of such a mounting structure, the pad spring 16 has a simple shape that does not require a cut strip, and can be manufactured easily at low cost.

FIG. 5 shows a second embodiment of the present invention, in which both pieces 20a and 20b constituting the caliper body 20 are divided at the end of the bridge portion 20d on the side of the operating portion, and the piece 20a on the operating portion side. Each of the reaction part side pieces 20b is formed by casting. Only the acting portion 20c is provided on the acting portion side piece 20a, and the entire bridge portion 20d and the reacting portion 20e are integrally formed on the reaction portion side piece 20b. These pieces 20a and 20b are integrally formed. The connecting bolt 6 to be connected and the hanger pin 15 for suspending the friction pads 11 and 12 are respectively inserted from the action portion side piece 20a side.

The ceiling opening 20f of the bridge portion 20d is cut out by opening at the end face 20g on the side of the action part 20c, and the notch is formed by closing the notch with a reaction part side piece 20b joined to the end face 20g. . A pair of guide grooves 17 (one of which is not shown) opening to the end face 20g of the bridge portion 20d is provided on both surfaces of the ceiling opening portion 20f on the disc entry and exit sides so as to face each other, and the pad spring 16 is provided. Similarly to the first embodiment, the edge 16b is inserted into the guide groove 17 and is prevented from coming off by the reaction portion side piece 20b joined to the end surface 20g of the bridge portion 20d.

6 and 7 show a third embodiment of the present invention, in which the caliper body 30 is divided from the approximate center of the bridge portion 30d, and each half of the bridge portion 30d is divided into the working portion side piece 30a. The reaction portion 30c and the reaction portion 30e of the reaction portion side piece 30b are integrally formed. Further, the ceiling opening 30f of the bridge portion 30d is also divided into two pieces 30a and 30b, and the guide grooves 17 and 17 formed to face the disk entrance and exit side surfaces of the ceiling opening 30f are divided. Openings are formed on the end faces 30g and 30g of each bridge portion 30d.

The pad spring 16 is inserted into the guide grooves 17, 17 of one of the action portion side and the reaction portion side pieces 30a, 30b in advance, or when both pieces 30a, 30b are connected to each other. The pieces 30a and 30b are inserted into the grooves 17 and 17 and are prevented from coming off by integrating the pieces 30a and 30b. Further, at the center of the pad spring 16, there is a pad pressing portion 16c that protrudes in an arc shape toward one side. When the pad spring 16 is attached to the caliper body 30, the upper surfaces of the hanging portions 14a, 14a are Besides, the pad pressing portion 16c abuts on the center of the upper surface of the back plate 14 to repel both the friction pads 11 and 12.

The caliper hoodies shown in the above-described embodiments are so-called open top type having a ceiling opening in the bridge portion, and the pad spring is attached using the ceiling opening. It suffices if guide grooves in the disc axial direction are provided opposite to each other in the bridge portion, and it does not matter whether or not the ceiling opening portion is provided. In addition to the hanger pin type, the friction pad holding structure may be a type in which the ear piece on the side of the back plate is held by the caliper bracket or caliper body, and is also applied to the piston facing caliper body. Is also possible.

[0026]

[Effect of device]

 Since the pad spring mounting structure of the present invention is configured as described above, the pad spring does not fall off even when the friction pad is replaced or attached / detached during maintenance, so the reassembly work of the pad spring is omitted. Therefore, the workability can be improved, and the mounting can be performed securely without the possibility of falling off due to external force such as flying stones or vibration of the vehicle body.

Further, since the pad spring inserted in the guide groove is prevented from coming off by utilizing the connection of the divided pieces, it is not necessary to use a separate coming-off preventing member, which is economical. Furthermore, since the pad spring has a simple shape that does not require a cut-out strip, not only the mounting work is simple, but also inexpensive and easy to manufacture.

Further, in the present invention, in addition to the hanger pin type in which the friction pad is suspended by the hanger pin, the ear pieces protruding from both sides of the back plate are fitted in the torque receiving recesses of the caliper bracket or the caliper body. It can also be applied to disc brakes that hold friction pads and disc brakes with a caliper body that faces the piston, and has wide versatility.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a partially sectional plan view of a disc brake showing a first embodiment of the present invention.

3 is a front view of FIG.

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a cross-sectional plan view of essential parts showing a second embodiment of the present invention.

FIG. 6 is a sectional front view showing a third embodiment of the present invention.

7 is a cross-sectional plan view of the main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 4 ... Caliper body 4a ... Acting part side piece 4b ... Reaction part side piece 4c ... Acting part 4d ... Bridge part 4e ... Reaction part 4g ... Ceiling established in bridge part 4d Opening 4h ... End face of bridge 4d 6 ... Connection bolts 11, 12 ... Friction pad 13 ... Lining 14 ... Back plate 14a ... Suspended part 16 of back plate 14 ... Pad spring 16a ... Pad spring 16 locking piece 16b ... Edge 17 of pad spring 16 ... Guide groove 20 ... Caliper body 20a ... Acting part side piece 20b ... Reaction part side piece 20c ... Acting part 20d ... Bridge part 20e ... Reaction part 20f ... Ceiling opening 20g ... End face of bridge part 20d 30 ... Caliper body 30a ... Working part side piece 30b ... Reaction part side The end surface of the over scan 30c ... working portion 30d ... bridge portion 30e ... reacting portion 30f ... ceiling opening 30 g ... bridge portion 30d

Claims (2)

[Scope of utility model registration request] 1. A caliper body is a split type in which two split pieces, which are split in parallel to the side surface of the disc rotor, are joined from one end of the bridge portion straddling the outer side of the disc rotor, In the vehicle disc brake including a pair of friction pads arranged opposite to each other on both sides of the disc rotor, a pad spring elastically inwardly of the disc, a bridge portion integrally formed on one of the split pieces, A pair of guide grooves that open to the end surface of the bridge portion are provided so as to face each other in the disc axial direction, and both ends of the pad spring are inserted into the guide groove from the opening of the end surface to engage the pad spring with the guide groove. At the same time, one end surface of the bridge portion is covered with the other of the split pieces to prevent the pad spring from coming off. Quake brake pad spring mounting structure. 2. A caliper body is a split type in which two split pieces that are split in parallel to the side surface of the disc rotor are joined from an intermediate portion of the bridge portion that straddles the outer side of the disc rotor, In a vehicle disc brake including a pair of friction pads arranged opposite to each other on both sides of the disc rotor, the pad portion springing inwardly of the disc, in the bridge portion divided into both of the divided pieces, respectively. A pair of guide grooves that open to the end face of the bridge portion are provided so as to face each other in the disc axial direction, and both end portions of the pad spring are inserted into the guide groove from the openings of each end face, and the pad spring is attached to both split pieces. Pad spring mounting structure for vehicle disc brakes, which is prevented from coming off by connection.