JP2021156368A - Caliper body of disc brake for vehicle - Google Patents

Abstract

To provide a caliper body of a disc brake for a vehicle capable of reducing a weight while improving connection strength of caliper half bodies.SOLUTION: Joining faces 5d, 6b of a first caliper half body 5 and a second caliper half body 6 disposed at both sides of a disc rotor 2 are abutted by a bridge portion 3a crossing over an outer periphery of the disc rotor 2, and connected by connection bolts 7 inserted to female screw holes 5e and insertion holes 6c respectively formed on the first caliper half body 5 and the second caliper half body 6 in opposition to each other so as to form a caliper body 3. Thinned portions 5f are respectively formed around the female screw holes 5e at an outer side in a disc radial direction with respect to an insertion hole connection line CL1 connecting disc rotor center-side end portions P1 of the female screw holes 5e of the joining faces 5d. Each thinned portion 5f is formed so as to gradually become shallow toward the outer side in the disc radial direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a caliper body of a vehicle disc brake, and more particularly to a split type caliper body formed by connecting a pair of caliper halves arranged on both sides of a disc rotor at a bridge portion.

Conventionally, as a split type caliper body formed by connecting a pair of caliper halves arranged on both sides of a disc rotor at a bridge portion, a lightening portion is provided inside the disc radial direction from the joint surface of the caliper halves. , There was an attempt to reduce the weight of the caliper body while maintaining the connected state between the joint surfaces (see, for example, Patent Document 1).

Utility Model Registration No. 2568937

Generally, in a split type caliper body, if undulations or roughness remain on the joint surface of the caliper semi-body, when the joint surfaces are butted and fastened with connecting bolts, there are places where the joint surfaces do not adhere to each other, resulting in joining. Since there is a possibility of affecting the adhesion between the surfaces, it is necessary to improve the processing accuracy of the joint surface and strictly control the flatness and the surface roughness.

In the above-mentioned Patent Document 1, although it is possible to reduce the weight of the caliper body while maintaining the connected state of both caliper halves, the joint surface is not wavy or roughened so that the surface of the joint surface does not remain. It is necessary to improve the processing accuracy of the above and strictly control the flatness and surface roughness, and the management of the processing accuracy of the joint surface has become complicated.

Therefore, an object of the present invention is to provide a caliper body of a disc brake for a vehicle, which can reduce complicated management of processing accuracy of a joint surface of a caliper half body.

In order to achieve the above object, in the caliper body of the vehicle disc brake of the present invention, the joint surfaces of a pair of caliper semifields arranged on both sides of the disc rotor are joined by a bridge portion straddling the outer periphery of the disc rotor. In the caliper body of a vehicle disc brake formed by connecting with a plurality of connecting bolts inserted into a plurality of connecting bolt mounting holes formed so as to face the caliper half body, at least one joint surface of the caliper half body. It is characterized by having a lightening part in the.

Further, the lightening portion is outside the insertion hole connecting line connecting the disc rotor center side ends of the connecting bolt mounting holes on the joint surface of the caliper half body in the disc radial direction, and the connecting bolt mounting holes. It is preferable that it is formed around.

Further, it is preferable to form the lightening portion gradually shallower toward the outside in the radial direction of the disc, and the lightening portion gradually becomes shallower as the distance from the connecting bolt increases.

According to the caliper body of the disc brake for a vehicle of the present invention, by providing a lightening portion on the joint surface to reduce the contact area between the joint surfaces, the contact surfaces between the joint surfaces are connected when the caliper semifields are connected. Since the pressure can be increased and the joint surfaces can be brought into close contact with each other while crushing the waviness and surface roughness of the joint surfaces, the connection strength can be increased.

Further, by providing the lightening portion, even if undulations and roughness remain on each joint surface, each joint surface can be brought into close contact with each other and the connection strength of both caliper halves can be increased. In addition, it is not necessary to improve the machining accuracy of the joint surface to strictly control the flatness and surface roughness, and it is possible to reduce the complicated management of machining accuracy. Further, by providing the lightening portion, the weight of the caliper body can be reduced.

Further, by providing the lightening portion around the connecting bolt mounting hole, the contact surface pressure around the bolt insertion hole on the joint surface can be lowered, the contact surface pressure on the outer peripheral side of the disk can be increased, and the joint surface can be increased. The overall contact surface pressure can be made as uniform as possible.

In addition, during braking, a braking reaction force acts on the caliper body, and both caliper halves try to open in a direction in which the inner side of each caliper half in the radial direction of the disc is separated from each other with the outer side of the joint surface in the radial direction of the disc as a fulcrum. However, by forming the depth of the lightening portion gradually shallower toward the outer side in the radial direction of the disc, the strength on the outer side in the radial direction of the disc can be maintained, and the joint surface can be prevented from being crushed by the compressive force.

FIG. 4 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a cross-sectional view taken along the line II-II of FIG. It is a front view of the disc brake for a vehicle which shows an example of one embodiment of this invention. It is also a side view of a vehicle disc brake. Similarly, it is a rear view of a vehicle disc brake. It is also a plan view of a vehicle disc brake.

1 to 6 are views showing an example of a form of a caliper body of a vehicle disc brake of the present invention. The arrow A indicates the rotation direction of the disc rotor that rotates integrally with the wheels when the vehicle is moving forward, and the disc feeding side and the disc turning side described below are defined as when the vehicle is moving forward.

The vehicle disc brake 1 of this embodiment is a disc rotor 2 that rotates integrally with wheels, a caliper body 3 that is attached to a vehicle body on one side of the disc rotor 2, and a disc rotor inside the caliper body 3. It is provided with a pair of friction pads 4 and 4 arranged so as to face each other with the 2 in between.

The caliper body 3 abuts the first caliper half body 5 arranged on the outside of the vehicle body of the disc rotor 2 and the second caliper half body 6 arranged on the inside of the vehicle body of the disc rotor 2 at the bridge portion 3a, 3 It is formed by connecting both caliper semifields 5 and 6 with the connecting bolts 7, 7 and 7 of the book. Cylinder holes 5a, 5a, 6a, 6a are formed to face each other on the disc entry side and the disk exit side of both caliper halves 5 and 6, and a piston 8 is formed in each cylinder hole 5a, 6a. Each is interpolated and formed in a 4-pot piston opposed type. A hydraulic chamber 9 is defined between each piston 8 and the bottom walls of the cylinder holes 5a and 6a, and each hydraulic chamber 9 communicates with a liquid passage 10. Further, in the first caliper half body 5, a union hole 5b for supplying the hydraulic fluid to the hydraulic chamber 9 is provided in the central portion in the circumferential direction of the disc, and a brewer 11 for discharging mixed air in the hydraulic fluid is provided on the disc feeding side. Further, vehicle body mounting boss portions 5c and 5c in the radial direction of the disc having insertion holes for mounting bolts for mounting the caliper body 3 to the vehicle body are provided on the disc feeding side and the disc feeding side, respectively.

The bridge portion 3a includes a disk feeding side bridge portion 3b arranged on the disk feeding side, a disc feeding side bridge portion 3c arranged on the disc feeding side, a disc feeding side bridge portion 3b, and a disc feeding. It has a central bridge portion 3d arranged between the side bridge portions 3c, between the central bridge portion 3d and the disk feeding side bridge portion 3b, and between the central bridge portion 3d and the disc feeding side bridge portion 3c. Ceiling openings 3e are formed between the two.

The first caliper half body 5 has each connecting bolt 7 on each joint surface 5d that is associated with the second caliper half body 6 by the disc feeding side bridge portion 3b, the disc feeding side bridge portion 3c, and the central bridge portion 3d. Each female screw hole 5e (connecting bolt mounting hole of the present invention) into which the male screw portion 7a of the above screw is screwed is open, and an insertion hole connecting line connecting the disc rotor center side end P1 of each female screw hole 5e on each joint surface 5d. A lightening portion 5f is formed on the outer side of the CL1 in the radial direction of the disk and around the female screw hole 5e. Further, the depth of each lightening portion 5f is formed so as to gradually become shallower toward the outside in the radial direction of the disc.

The second caliper half body 6 has a connecting bolt 7 on each joint surface 6b that is associated with the second caliper half body 6 by the disc feeding side bridge portion 3b, the disc feeding side bridge portion 3c, and the central bridge portion 3d. The insertion holes 6c (connecting bolt mounting holes of the present invention) are opened facing the female screw holes 5e, and the male screw portion 7a of the connecting bolts 7 inserted from the insertion holes 6c is screwed into the female screw holes 5e. Will be concluded.

The friction pad 4 includes a lining 4a that is in sliding contact with the disc rotor 2 and a back plate 4b on which the lining 4a is mounted. , 4c are projected, and the friction pads 4c and 4c are instructed to be movable in the disc axial direction by accommodating the ear pieces 4c and 4c in the pad guide grooves 3f and 3f formed in the caliper body 3.

The caliper body 3 formed as described above is formed by matching the joint surfaces 5d, 5d, 5d of the first caliper half body 5 with the joint surfaces 6b, 6b, 6b of the second caliper half body 6, and each insertion hole. The first caliper half body 5 and the second caliper half body 6 are connected by inserting the connecting bolts 7 from 6c and screwing and fastening the male screw portions 7a of the connecting bolt 7 into the opposite female screw holes 5e. NS.

At this time, the lightening portion 5f is located outside the insertion hole connecting line CL1 connecting the disc rotor center side ends P1 of each female screw hole 5e of the first caliper half body 5 in the disc radial direction and around the female screw hole 5e. By forming the above, the contact area between the joint surfaces 5d, 5d, 5d and the joint surfaces 6b, 6b, 6b can be reduced and the contact surface pressure can be increased, and the undulations and roughness of the joint surfaces 5d, 6b can be increased. It is possible to increase the connection strength by bringing the joint surfaces 5d and 6b into close contact with each other while crushing the radius. Further, by providing the lightening portion 5f, the weight of the caliper body 3 can be reduced.

Further, since each lightening portion 5f is provided around each female screw hole 5e, the contact surface pressure decreases around the female screw holes 5e and the insertion holes 6c of the joint surfaces 5d and 6b, and the contact surface pressure on the outer peripheral side of the disk. In addition to being able to increase the pressure, the contact surface pressure of the entire joint surfaces 5d and 6b can be made as uniform as possible.

Further, in the caliper body 3, a braking reaction force acts during braking, and the first caliper half body 5 and the second caliper half body 6 have the first caliper half body 5 and the second caliper half body 6 as fulcrums on the outer sides of the joint surfaces 5d and 6b in the disc radial direction. The inside of the semifield 5 and the second caliper semifield 6 in the radial direction of the disc try to open in a direction in which they are separated from each other. , The strength of each joint surface 5d on the outer side in the radial direction of the disk is maintained, and it is possible to suppress the collapse due to the compressive force.

As described above, by providing the lightening portions 5f, 5f, 5f, even if the joint surfaces 5d, 6b have waviness or roughness, the joint surfaces 5d, 6b are brought into close contact with each other, and the first caliper and a half Since the connection strength between the body 5 and the second caliper half body 6 can be increased, it is not necessary to improve the processing accuracy of the joint surfaces 5d and 6b and strictly control the flatness and surface roughness as in the conventional case. It is possible to reduce the complicated management of processing accuracy.

The caliper body of the present invention is not limited to the above-described embodiment, and the shape of the bridge portion is arbitrary, and a caliper body having no ceiling opening may be used. Further, the present invention can be applied not only to a 4-pot piston-opposed caliper body but also to a 2-pot piston-opposed caliper body, and further can be applied to a 6-pot or more piston-opposed caliper body. .. Further, the lightening portion may be provided at any position on the joint surface, and may be formed on the joint surface of both caliper semifields. Further, the lightening portion does not have to be formed gradually shallower toward the outside in the radial direction of the disc, and may be formed at the same depth.

Further, the lightening portion may be provided outside in the radial direction of the disk from the insertion hole connecting line passing through the central axis of each female screw hole, and this may cause the connecting bolt to fall even if the lightening portion is provided. No. Further, the present invention is not limited to the one applied to the piston-opposed caliper body as in the above-described embodiment, but can also be applied to the split type pin slide type caliper body.

1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... Bridge part, 3b ... Disc feeding side bridge part, 3c ... Disc feeding side bridge part, 3d ... Central bridge part, 3e ... Ceiling opening Part, 3f ... Pad guide groove, 4 ... Friction pad, 4a ... Lining, 4b ... Back plate, 4c ... Ear piece, 5 ... First caliper half body, 5a ... Cylinder hole, 5b ... Union hole, 5c ... Body mounting boss Part, 5d ... Joint surface, 5e ... Female screw hole, 5f ... Lightening part, 6 ... Second caliper half body, 6a ... Cylinder hole, 6b ... Joint surface, 6c ... Insertion hole, 7 ... Connecting bolt, 7a ... Male threaded part , 8 ... Piston, 9 ... Hydraulic chamber, 10 ... Liquid passage, 11 ... Brewer

Claims (3)

The joint surfaces of a pair of caliper halves arranged on both sides of the disc rotor are joined by a bridge portion straddling the outer periphery of the disc rotor, and inserted into a plurality of connecting bolt mounting holes formed so as to face the caliper halves. In the caliper body of a vehicle disc brake formed by connecting a plurality of connecting bolts, the caliper body of the vehicle disc brake is characterized in that a lightening portion is provided on the joint surface of at least one of the caliper semifields. .. The lightening portion is outside the insertion hole connecting line connecting the disc rotor center side ends of the connecting bolt mounting holes on the joint surface of the caliper half body in the disc radial direction, and around the connecting bolt mounting holes. The caliper body of a vehicle disc brake according to claim 1, wherein the caliper body is formed. The caliper body of a vehicle disc brake according to claim 1 or 2, wherein the depth of the lightening portion is gradually formed to be shallow toward the outside in the radial direction of the disc.

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