JP2006292006A - Brake disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake disk capable of reducing the number of components related to torque transmission to a required minimum, fitting a braking body and a mounting member with excellent fitting accuracy and transmitting torque based on the fitted relation between them. <P>SOLUTION: The brake disk is provided with at least the annular braking body 1 and the mounting member 2 mounted to the center region of the braking body 1. The braking body 1 is formed with a circular fitting recessed part 17 having an outline formed along a circle centering on an offset axis X offset by a predetermined distance from a rotation axis C. The mounting member 2 is formed with a circular fitting part 23 having an outline formed along the circle centering on the offset axis X. Based on the fitted relation between the circular fitting recessed part 17 and the circular fitting part 23, the braking body 1 and the mounting member 2 are integrally rotatable to realize torque transmission between them. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brake disc for a disc brake.

  Many brake discs, which are main components of a disc brake device, are configured by mounting a disc-shaped or cylindrical mounting member in the central region of an annular braking body. In such a type of brake disk, a pin or rivet connection structure (see Patent Documents 1 and 2) is used as a structure for connecting the brake body and the mounting member so that torque transmission between the brake body and the mounting member can be integrally rotated. Some have adopted a fastening structure with a key or serration at a bolt hole site (see Patent Documents 3 and 4). A serration can be regarded as a structure in which a plurality of keys are collected.

  However, when transmitting torque via a rod-like connecting material such as a pin or rivet, the mechanical strength of each bar-like connecting material is limited, so a design that increases the number of rod-like connecting materials to ensure durability I have to take it. In that case, the number of component parts increases, and the number of manufacturing processes and manufacturing costs tend to increase.

  On the other hand, it is also conceivable to employ a fitting structure similar to a key or serration as a connection structure for transmitting torque between the annular braking body and the disc-shaped or cylindrical mounting member. However, in general, there is a limit to increasing the processing accuracy of the key and keyway, so it is difficult to improve the fitting accuracy between the brake member and the mounting member that are in a mutual fitting relationship to a certain limit or more. It is difficult to prevent the occurrence of backlash between the two.

Japanese Utility Model Publication No. 60-126736 JP 2003-130102 A JP 2003-320932 A Japanese Patent Laid-Open No. 2005-54999

  The object of the present invention is to minimize the number of components related to torque transmission, and to enable the braking body and the mounting member to be fitted with excellent fitting accuracy. It is an object of the present invention to provide a brake disc capable of transmitting torque based on the above.

  The invention according to claim 1 is a brake disk comprising an annular braking body and a mounting member attached to a central region of the braking body. One of the braking body and the mounting member includes a braking body. A circular fitting recess having a contour along a circle drawn around an offset axis (X) offset by a predetermined distance with respect to the rotation axis (C) of the brake body and the mounting member. On the other side, a circular fitting portion having a contour along a circle drawn around the offset axis (X) is formed so as to correspond to the circular fitting concave portion, and the circular fitting concave portion and the circular fitting are formed. The brake disc is characterized in that the braking body and the mounting member can be integrally rotated during rotation about the rotation axis (C) based on the fitting relationship with the portion.

  According to a second aspect of the present invention, there is provided a brake disk comprising an annular braking body and an attachment member attached to a central region of the braking body. The braking body includes a rotation axis (C) of the braking body. A circular fitting recess having a contour along a circle drawn with an offset axis (X) offset by a predetermined distance as a center is formed, and the mounting member is adapted to correspond to the circular fitting recess. A circular fitting portion having a contour along a circle drawn around the offset axis (X) is formed, and the rotation axis is based on the fitting relationship between the circular fitting concave portion and the circular fitting portion. The brake disk is characterized in that the brake member and the mounting member can be rotated together during rotation about (C).

  According to a third aspect of the present invention, in the brake disc according to the second aspect of the present invention, the peripheral edge of the circular fitting recess of the braking portion is fitted with the circular fitting portion of the mounting member in the circular fitting concave portion of the braking body. By attaching a pressing plate in the vicinity, the mounting member cannot be detached from the circular fitting recess of the braking body.

[Action]
In the brake disk according to any one of claims 1 to 3, the circular fitting recess and the circular fitting portion in the braking body and the mounting member are centered on an offset axis (X) offset by a predetermined distance with respect to the rotation axis (C) of the braking body. It is formed as a circular fitting recess or fitting portion having a contour along a circle drawn as. Therefore, when the entire brake disc is rotated around the rotation axis (C) of the braking body, the braking body and the mounting member are formed by a circular fitting recess and a circular fitting portion that are eccentric with respect to the rotation axis (C). Relative rotation is impossible based on the fitting relationship. That is, as long as this brake disk is attached to an axle or the like and used in such a manner that the brake disc is rotated around the rotation axis (C), the brake body and the attachment member are connected so as to be integrally rotatable and can transmit torque to each other.

  According to the third aspect of the present invention, the mounting member is detached from the circular fitting concave portion of the braking body in the rotation axis (C) direction by a relatively simple structure in which the holding plate is fixed near the periphery of the circular fitting concave portion of the braking portion. Or it can prevent falling off.

  According to the brake disk of each claim, between the brake body and the mounting member based on the fitting relationship between the circular fitting recess and the circular fitting portion that are eccentric with respect to the rotation axis (C) of the braking body. Therefore, the number of components related to torque transmission can be reduced as compared with the conventional example in which torque transmission is performed via a rod-like connecting material such as a pin or a rivet. In addition, the circular fitting recess and the circular fitting portion in the braking body and the mounting member have an outline along a circle drawn with the offset axis (X) as the center, so that it is very easy to form a machining with a machine tool (for example, a lathe). It is. Furthermore, since the circular shape is the most basic and simple shape in machining, the machining accuracy can be improved, and the fitting accuracy between the circular fitting recess and the circular fitting portion can be improved to prevent backlash. It can be avoided in advance.

  An embodiment in which the present invention is embodied in a ventilated brake disc will be described with reference to the drawings. As shown in FIGS. 1 to 5, the brake disk includes an annular braking body 1, a substantially short cylindrical mounting member 2 attached to the central region of the braking body 1, and an annular pressing plate 3. Has been.

  As shown in FIGS. 1 to 3, the annular brake body 1 is formed by integrally molding cast iron (for example, flake graphite cast iron) by casting. The braking body 1 includes a first annular disc portion 11 and a second annular disc portion 12 that are connected to each other by a plurality of connecting ribs 13 that extend radially between the annular disc portions 11 and 12. They are connected, and have a ventilated structure in which air passages 14 extending radially are secured between adjacent connecting ribs 13. The outer side surfaces of the first and second annular disk portions 11 and 12 serve as braking surfaces (sliding surfaces) that make frictional contact with the brake caliper brake brake.

  The first annular disc portion 11 of the brake body 1 is formed with at least a first circular fitting concave portion 16 and a second circular fitting concave portion 17 as a two-stage concave portion in the central region. More specifically, a first circular fitting recess 16 having a relatively shallow depth is formed on the outer surface of the first annular disk portion 11, and the first circular fitting recess 16 is formed inside the first circular fitting recess 16. A deeper second circular fitting recess 17 is formed.

  The first circular fitting recess 16 is formed in a circular shape having a contour along a circle drawn around the rotation axis C of the braking body 1 (which coincides with the rotation axis of the axle when attached to the axle). (See FIGS. 1 and 2B). The inner diameter of the first circular fitting recess 16 is equal to the outer diameter of the annular pressing plate 3, and the depth of the first circular fitting recess 16 is equal to the thickness of the annular pressing plate 3. For this reason, the annular pressing plate 3 can be fitted to the first circular fitting recess 16. A plurality of screw holes 18 (eight in this example) are arranged and formed at equiangular intervals in the bottom area of the first circular fitting recess 16.

  The second circular fitting recess 17 is inside the first circular fitting recess 16 and is a circle drawn around an offset axis X offset by a predetermined distance d with respect to the rotation axis C of the braking body 1. It is formed in the circular shape which has the outline along (refer FIG.1 and FIG.2 (B)). The inner diameter of the second circular fitting recess 17 is equal to the outer diameter of a circular fitting portion 23 of the mounting member 2 described later, and the depth of the second circular fitting recess 17 (first circular fitting recess). The depth with respect to the bottom surface of 16 is equal to the thickness of the circular fitting portion 23 of the mounting member 2. For this reason, the circular fitting portion 23 of the mounting member 2 can be fitted into the second circular fitting recess 17.

  As shown in FIGS. 1 and 4, the attachment member 2 is formed by integrally molding an aluminum alloy by casting. The mounting member 2 includes a disk-shaped axle mounting flange 21, a short cylindrical cylindrical wall 22 provided at the outer peripheral edge of the flange 21, and a circular shape provided in a bowl shape around the cylindrical wall 22. And a fitting portion 23.

  The axle mounting flange 21 of the mounting member 2 expands in a direction (radial direction) perpendicular to the rotation axis C common to the mounting member 2 and the braking body 1. The cylindrical wall 22 extends rearward from the outer peripheral edge of the axle mounting flange 21 in parallel with the rotation axis C. The axle mounting flange 21 is formed with a central large hole 24 for passing the axle at the center position, and a plurality of bolt insertion holes 25 (five in this example) are equiangular at positions surrounding the central large hole 24. Arranged and formed at intervals.

  The circular fitting portion 23 of the mounting member 2 is provided so as to project from the rear end edge of the cylindrical wall 22 outward in the radial direction over the entire circumference of the cylindrical wall 22. However, as shown in FIGS. 4A to 4C, the circular fitting portion 23 has a rotation axis common to the brake body 1 and the mounting member 2 so as to correspond to the second circular fitting concave portion 17. It is formed in a circular shape having a contour along a circle drawn around the offset axis X offset by a predetermined distance d with respect to C. Therefore, the contour of the circular fitting portion 23 and the contour (circular shape) of the axle mounting flange 21 or the cylindrical wall 22 are not in a concentric relationship but in an eccentric relationship with each other.

  As shown in FIGS. 1 and 5, the pressing plate 3 is formed by integrally molding an aluminum alloy by casting. The presser plate 3 has an annular shape with a predetermined thickness, and both the outer peripheral edge and the inner peripheral edge have a contour along a circle drawn around the rotation axis C common to the brake body 1 and the mounting member 2. is doing. A plurality of screw-through holes 31 (eight in this example) are arranged and formed in the pressing plate 3 at equal angular intervals. These screw through holes 31 correspond to the respective screw holes 18 in the bottom area of the first circular fitting recess 16 of the braking body 1.

  In assembling the brake disk, as shown in FIGS. 1 to 3, first, the circular fitting portion 23 of the mounting member 2 is fitted into the second circular fitting recess 17 of the brake body 1. Then, it is preferable that the outer surface of the circular fitting portion 23 is substantially flush with the bottom surface of the first circular fitting recess 16, and the circular fitting portion 23 of the mounting member 2 is the second circular fitting of the braking body 1. Fit into the recess 17. Next, the holding plate 3 is inserted into the first circular fitting recess 16 of the braking body 1. Then, it is preferable that the outer surface of the pressing plate 3 is substantially flush with the outer surface of the first annular disc portion 11 of the braking body 1, and the pressing plate 3 is formed in the first circular fitting recess 16 of the braking body 1. Fit. Then, the screws 4 are attached to the screw through holes 31 from the outer side (front) side of the presser plate 3, and the screws 4 are screwed into the screw holes 18 of the brake body 1. The pressing plate 3 is fixed to the vicinity of the periphery of the second circular fitting recess 17 of the braking body 1. As a result, the pressing plate 3 fixed to the brake body 1 prevents the mounting member 2 from being detached from the second circular fitting recess 17 in the axial direction and is integrated with the brake body 1.

[Operation and Effect of Embodiment]
In the brake disk of the present embodiment, the second circular fitting recess 17 of the braking body 1 and the circular fitting portion 23 of the mounting member 2 are circles centered on the offset axis X that is offset with respect to the rotation axis C (that is, true It is formed as a circular fitting recess or fitting portion having a contour along a circle or a perfect circle. Therefore, when the brake disc is actually attached to the axle and the disc is rotated about the rotation axis C, the second circular fitting recess 17 and the circular fitting portion 23 which are eccentric with respect to the rotation axis C are fitted. Based on the joint relationship, the brake body 1 and the mounting member 2 cannot be rotated relative to each other, and both function as an integral disk capable of transmitting torque to each other.

  According to the present embodiment, between the braking body 1 and the mounting member 2 based on the fitting relationship between the second circular fitting recess 17 and the circular fitting part 23 that are eccentric with respect to the rotation axis C of the braking body 1. Therefore, the number of components related to torque transmission is small compared to the conventional example in which torque transmission is performed via a rod-like connecting material such as a pin or rivet. Therefore, manufacturing costs and the like can be suppressed. It should be noted that the screw 4 used in the present embodiment is not a part involved in torque transmission, and therefore does not cause an increase in manufacturing cost or the like.

  According to the present embodiment, the second circular fitting recess 17 of the braking body 1 and the circular fitting portion 23 of the mounting member 2 have contours along a circle centered on the offset axis X, so that a general purpose such as a lathe is used. It is extremely easy to form with a machine tool. Further, since the circular shape is the most basic and simple shape, it is possible to improve the processing accuracy related to tolerances. Therefore, it is possible to improve the fitting accuracy between the second circular fitting recess 17 and the circular fitting portion 23 and prevent the occurrence of backlash. If there is no backlash, vibration and unpleasant noise during braking can be suppressed.

  By the way, elliptical shapes and polygonal shapes (for example, regular hexagonal shapes) are generally regarded as basic and simple shapes, but these shapes are still much more complex and accurate than a perfect circle shape. Drawing complex outlines requires complex and cumbersome process control. According to the recognition of those skilled in the machining field, it is difficult to improve the processing accuracy of elliptical and polygonal shapes as much as the perfect circular shape, and furthermore, the fitting accuracy is so high that there is no backlash when fitting. It is very difficult to increase. Therefore, in this embodiment, the contours of the second circular fitting recess 17 of the braking body 1 and the circular fitting portion 23 of the mounting member 2 are particularly further circular (perfect circle or perfect circle).

  [Modification]: In the above embodiment, the pressing plate 3 is fixed to the braking body 1 using the screws 4, but fasteners such as rivets may be used instead of the screws 4.

  [Modification]: In the above embodiment, the circular fitting portion 23 is provided on the mounting member 2 side, while the second circular fitting concave portion 17 corresponding to the circular fitting portion 23 is provided on the braking body 1 side. . Instead of this, a fitting structure in which the concave-convex relationship is reversed, in which a circular fitting portion is provided on the side of the braking body 1 and a circular fitting concave portion corresponding to the circular fitting portion is provided on the mounting member 2 side. May be adopted.

The disassembled perspective view of the brake disc according to one Embodiment. (A) is a front view of the assembled brake disc, (B) is a sectional view taken along line A-C-A 'of (A). FIG. 3 is a rear view of the brake disc shown in FIG. (A) is a front view of an attachment member, (B) is a sectional view taken along line B-C-B 'of (A), and (C) is a rear view of the attachment member. (A) is a front view of a pressing plate, (B) is a cross-sectional view taken along line Q-Q in (A).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Brake body, 2 ... Mounting member, 3 ... Holding plate, 4 ... Screw, 16 ... 1st circular fitting recessed part of a braking body, 17 ... 2nd circular fitting recessed part of braking body (Centering on an offset axis line) Circular fitting recess), 23... Circular fitting portion of the mounting member, C... Rotation axis, X.

Claims (3)

In a brake disc comprising an annular braking body and a mounting member attached to the central region of the braking body,
One of the brake body and the mounting member has a circular fitting recess having a contour along a circle drawn around an offset axis (X) offset by a predetermined distance with respect to the rotation axis (C) of the brake body And the other of the braking body and the mounting member has a circular fitting portion having a contour along a circle drawn around the offset axis (X) so as to correspond to the circular fitting recess. Is formed,
Based on the fitting relationship between the circular fitting recess and the circular fitting portion, the braking body and the mounting member can be integrally rotated during rotation about the rotation axis (C). brake disc. In a brake disc comprising an annular braking body and a mounting member attached to the central region of the braking body,
The brake body is formed with a circular fitting recess having a contour along a circle drawn around an offset axis (X) offset by a predetermined distance with respect to the rotation axis (C) of the brake body, The mounting member is formed with a circular fitting portion having a contour along a circle drawn around the offset axis (X) to correspond to the circular fitting recess,
Based on the fitting relationship between the circular fitting recess and the circular fitting portion, the braking body and the mounting member can be integrally rotated during rotation about the rotation axis (C). brake disc.   In a state where the circular fitting portion of the mounting member is fitted to the circular fitting concave portion of the braking body, the attachment member is fixed to the circular shape of the braking body by fixing a pressing plate near the periphery of the circular fitting concave portion of the braking portion. The brake disk according to claim 2, wherein the brake disc cannot be detached from the fitting recess.

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