JP2010242920A - Split type caliper body joint structure for vehicular disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight and size of a split type caliper body by reducing thicknesses of connection bolts with which both caliper halves of the split type caliper body are joined to each other, or reducing the number of the connection bolts. <P>SOLUTION: On a joint face 17 of one caliper half 8a, a fitting protruded strip 18 is formed which is protruded in the direction of a shaft 11 of a disc rotor 2 and curved circularly around the shaft 11. The cross section perpendicular to the center line of the fitting protruded strip 18 is shaped trapezoidal so that its base is narrower and its front end extends to both sides to be wider than the base. In a joint face 26 of the other caliper half 8b, a fitted groove 27 is formed which the fitting protruded strip 18 fits and whose cross section is shaped to be the same as the cross section of the fitting protruded strip 18. Near a fitting area where the fitting protruded strip fits the fitted groove, the connection bolt is arranged in a state of being inserted through the disc rotor in the axial direction. Preferably, the center position of the connection bolt is shifted from the center line of the fitting area to the disc rotor side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a split caliper body coupling structure used for a disc brake mounted on a four-wheeled vehicle or other vehicles.

  Conventionally, when a caliper body, which is a main part of a vehicle disc brake, is divided, the caliper body is divided at a bridge portion that straddles a part of the outer peripheral surface of the disc rotor and disposed on one side of both sides of the disc rotor. The caliper half that pushes the friction pad and the caliper half that pushes the friction pad disposed on the other side are manufactured separately. Then, when the caliper body is assembled, both divided surfaces of the divided bridge portion become the respective joint surfaces of both caliper halves. Therefore, the joint surfaces of both caliper halves are butted together and a plurality of connection bolts are inserted through the joint surfaces in the axial direction of the disk rotor so that the two caliper halves are joined together. As a result, the caliper body is assembled.

    Such joint surfaces of both caliper halves are generally flat surfaces perpendicular to the axial direction of the disk rotor. However, if the joint surfaces of both caliper halves are flat, when the braking action is performed by the disc brake, the caliper body is deformed so as to be opened in a C shape with the bridge portion as a fulcrum by the braking reaction force. In the split caliper body, the bending load due to opening especially concentrates on the joint surface of the caliper half and damages the joint surface, and the connecting bolt is bent and the thread is crushed. There was a problem of losing.

Therefore, “a fitting projection in the disk axial direction is formed on the joint surface of one caliper half, and a bottomed fitting recess is the same as the fitting projection on the joint surface of the other caliper half. A vehicle disc that is formed in a cross-sectional shape, and the connection bolt is inserted in the disc axial direction into the concave-convex fitting portion in which the fitting convex portion is fitted into the fitting concave portion, and both caliper halves are joined. A split caliper body connection structure in a brake is presented. And according to the coupling structure of the split caliper body, “the bending load due to the braking reaction force is wide with the connecting bolt and the uneven fitting portion in which the joint surface and the fitting convex portion fit into the fitting concave portion without a gap. Since it is supported by the area and the bending load is distributed throughout the caliper body, the burden on the joint surface and connecting bolt is reduced, the durability of the caliper half and connecting bolt is increased, and it can withstand repeated use. In addition, since the fitting projections and depressions that fit the fitting projections in the fitting recesses are on the joint surface with a large load and can withstand bending loads, deformation and damage of the joint surface are minimized. At the same time it can be kept small, it protects the connecting bolt and effectively prevents deformation such as bending and screw crushing etc. Also, since deformation of the connecting bolt is suppressed, the caliper half can be easily disassembled and the piston Detaching and replacing seals In a short period of time it can be performed conveniently "have claimed effect.
Utility model registration No. 2557639

  However, in such a split caliper body coupling structure, since the cross-sectional shape perpendicular to the center line of the fitting convex portion provided on the joint surface of one caliper half is a rectangle, the disc brakes act to When a braking reaction force is applied to open and separate both caliper halves in the axial direction of the rotor, it is almost the coupling force by each of the plurality of connecting bolts that prevents the separation. For this reason, in order to withstand the braking reaction force that attempts to open and separate the two caliper halves in the axial direction of the disc rotor, the rigidity of each of the plurality of connecting bolts that couple the caliper halves must be increased, Normally, it is necessary to make each connecting bolt thicker. Therefore, the thickness or number of connecting bolts connecting the two caliper halves is a problem for reducing the weight or size of the split caliper body.

The present invention has been made paying attention to such a conventional problem, and by dividing or reducing the number of connecting bolts connecting the two caliper halves of the divided caliper body, the divided caliper body is provided. An object of the present invention is to provide a split caliper body coupling structure for a vehicle disc brake that can reduce the weight of the vehicle.

  In order to achieve the above object, a split caliper body coupling structure for a vehicle disc brake according to the present invention is a bridge portion straddling the caliper body across a part of the outer peripheral surface of the disc rotor in a direction perpendicular to the axial direction of the disc rotor. The caliper half that pushes the friction pad disposed on one side of the disk rotor and the caliper half that pushes the friction pad disposed on the other side are separated into two parts. The joining surfaces at the divided bridge portions of the caliper halves are butted together, and the caliper halves are joined by connecting bolts that are inserted in the axial direction of the disk rotor.

  Then, on the joint surface of one caliper half, a fitting ridge that protrudes in the axial direction of the disk rotor and bends in an arc shape around the axis of the disk rotor is formed. A trapezoidal shape with a right-angled cross-sectional shape with a narrow base and a wider tip at both sides than the width of the base, and the above-mentioned fitting ridge is fitted on the joint surface of the other caliper half. The mating fitting groove is formed to have the same cross-sectional shape as that of the fitting protrusion.

  Also, the connecting bolt is inserted in the axial direction of the disk rotor in the vicinity of the fitting portion where the fitting protrusion is fitted in the fitting groove, and the center position of the connecting bolt is set to the fitting portion. It is preferable that the center line is shifted to the disk rotor side.

  A split type caliper body for a vehicle disc brake according to the present invention has an arcuate shape provided at one end of an arcuate fitting protrusion provided on the joining surface of one caliper half and an joining surface of the other caliper half. Fit one end of the fitting groove, rotate both caliper halves in opposite directions, slide the fitting ridge along the fitting groove, and fit all of the fitting ridges Fits into the groove. Then, a cross-sectional shape perpendicular to the center line of the arc-shaped fitting protrusion is formed, the width of the root is narrowed, the width of the tip is extended to both sides from the width of the root, and a trapezoid is formed. Since the cross-sectional shape is the same trapezoidal shape, even if the braking reaction force that opens the joint surfaces of both caliper halves works in the axial direction of the disk rotor, both the inclined outer surfaces of the fitting protrusions and the fitting grooves Corresponding inclined inner surfaces are closely adhered to each other, and the wide end side of the fitting protrusion cannot move toward the narrow base side of the fitting groove, and the fitting state of the protrusion and groove can be maintained. The caliper halves do not separate.

  Therefore, even if both caliper halves are in a coupled state in which the fitting ridges are only fitted in the fitting grooves, the joint surfaces of both caliper halves are crossed due to the braking reaction force of the disc brake. A large bonding force capable of resisting deformation forces such as pulling and twisting to open in the shape is obtained. Therefore, the joint surfaces of the divided bridge portions of both caliper halves are inserted in the axial direction of the disk rotor, and the thickness of the connecting bolts connecting the caliper halves is reduced, or the number of connecting bolts used is reduced. Thus, the split caliper body can be reduced in weight or size.

  Also, the connecting bolt is inserted in the axial direction of the disk rotor in the vicinity of the fitting portion where the fitting protrusion is fitted in the fitting groove, and the center position of the connecting bolt is set to the fitting portion. The coupling force by the fitting part of both caliper halves and the coupling force by the coupling bolt that shifts the center position of the coupling bolt to the disk rotor side from the center line of the fitting part. As a result, it is possible to obtain a larger bonding force that can resist deformation forces such as tension and twisting that attempt to open the joint surfaces of both caliper halves in a C shape.

Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view taken along the line AA of FIG. 3 showing an embodiment of a disc brake for a four-wheeled vehicle to which the present invention is applied, FIG. 2 is a front view of the disc brake for the four-wheeled vehicle, and FIG. It is a top view of the disc brake for motor vehicles. The disc brake 1 for a four-wheeled vehicle includes a disc rotor 2, a split caliper body 3 that sandwiches the disc rotor 2 across a part of the outer peripheral surface of the disc rotor 2, and friction that acts between each of them to perform a braking action. Each of the friction pads 4 is operated by a cylinder that is composed of the pads 4 (4a, 4b) and is installed on the split caliper body 3. In order to make the caliper body 3 into a split type, the caliper body 3 is divided into two equal parts at the bridge portion 6 (6a, 6b) with a central opening 5 (5a, 5b) straddling a part of the outer peripheral surface of the disk rotor 2. Then, the caliper half 8a that pushes the friction pad 4a with the base plate 7a disposed on one side of the both sides of the disk rotor 2 and the caliper that pushes the friction pad 4b with the base plate 7b disposed on the other side. The half body 8b can be manufactured separately, for example, by hot forging. If the central opening 5 is provided in the bridge portion 6 in this manner, the friction pads 4 with the base plates 7 accommodated therein can be replaced while the caliper body 3 is mounted on the vehicle body. However, the dividing position of the bridge portion 6 does not necessarily have to be in the center, and may be shifted to one side. In addition, 10 (10a, 10b) is a hydraulic chamber for applying hydraulic pressure to the piston 9 (9a, 9b).

  Such a caliper half body 8a is disposed so as to fit in the accommodation space inside the wheel, and the caliper half body 8b is disposed below the vehicle body. Then, the caliper half body 8a is installed outside, while the caliper half body 8b is installed inside. Therefore, at the time of manufacture, the caliper half 8a is formed in a generally arcuate plate shape as shown in FIGS. 4 and 5, and the caliper half 8b is formed in an arcuate plate shape having substantially the same shape as shown in FIGS. Form. Further, the caliper halves 8a and 8b have a generally symmetrical structure. Note that the center of each arc of the caliper halves 8 a and 8 b is the shaft 11 of the disk rotor 2.

  A caliper half 8a for outer installation is provided with a through hole 13 for screwing a positioning bolt 12 in the center of the arc-shaped peripheral edge of the disk rotor 2 to prevent rattling of both friction pads 4. Provide in the direction. Moreover, the edge part side opposite to the circular-arc-shaped peripheral part of the caliper half body 8a is wide, and it protrudes outside, and the center protrusion part 14 is formed. Further, three cylinder holes 15 (15a, 15b, 15c) are distributed inside the central projecting portion 14, and both ends of the oil flow path connecting all the cylinder holes 15 are provided at both ends of the central projecting portion 14. It guide | induces to opening of each cylindrical edge part 16 (16a, 16b).

The joint surfaces 17 (17a, 17b) of the caliper half body 8a are inner arcuate peripheral portions on both sides of the central opening 5a of the bridge portion 6a, and both have a constant width L, Is on the rotation inlet side (outlet side) of the disk rotor 2, and the other is on the rotation outlet side (inlet side). Then, in the vicinity of the center portion of the width L of each joint surface 17, as shown in FIG. 8, it protrudes in the axial direction of the disk rotor 3, and the protruding length is L ₁ , and the arc shape centering on the axis 11 of the disk rotor 3. The fitting protrusions 18 (18a, 18b) that bend in the direction are formed. Moreover, a right-angled cross-sectional shape to the center line to reduce the width L ₂ of the base of the fitting protrusion 18, is widely trapezoidal width L ₃ of the tip on either side than the width L ₂ of the base for example equal respectively extended by . In this case, for example, when L is 15 mm, it is optimal that L ₂ = L / 2 = 7.5 mm, L ₂ <L ₁ = 6 mm, α = 5 degrees, and L ₃ = 8.55 mm. Α is an angle between each outer surface on both sides of the fitting protrusion 18 and the axial direction of the disc rotor shaft 2, and α is appropriately selected between 1 and 30 degrees according to the width of L. If the width is long, α can be increased, and the larger α is, the better the coupling state with the fitting groove 27 is.

  Further, through holes 20 (20a,... 20d) for screwing the connecting bolts 19 (19a,... 19d) are used in the vicinity of both ends of each fitting protrusion 18 to connect the caliper halves 8. Each is provided so as to penetrate the disk rotor 2 in the axial direction. In that case, the center of each through-hole 20 is defined on the centerline of each corresponding fitting protrusion 18 respectively. However, the center of each through-hole 20 can be determined by being shifted from the center line of each fitting protrusion 18. In addition, 29 (29a, 29b) is a support installation hole for supporting each friction pad 4 with each base plate 7. FIG.

  The caliper half 8b for inner installation is provided with a through hole 21 for screwing the positioning bolt 12 in the center of the arc-shaped peripheral edge. Furthermore, a through hole 22 for injecting hydraulic fluid, for example oil, is provided in the center of the caliper half 8b, and the edge opposite to the arc-shaped peripheral edge is widened with the oil injection hole 22 at the center, and protrudes outward. Thus, the central protrusion 23 is formed. Three cylinder holes 24 (24 a, 24 b, 24 c) are dispersedly arranged inside the central protrusion 23, and both ends of the oil flow path connecting all the cylinder holes 24 are provided at both ends of the central protrusion 23. It guide | induces to opening (not shown) of each cylindrical edge part 25 (25a, 25b).

  The joint surfaces 26 (26a, 26b) of the caliper half body 8b are arcuate peripheral edges on both sides of the central opening 5b of the bridge portion 6b, and both have a constant width L, Is on the rotation inlet side (outlet side) of the disk rotor 2, and the other is on the rotation outlet side (inlet side). Then, in the vicinity of the center portion of the width L of each joint surface 26, fitting grooves 27 (27a, 27b) that retreat in the axial direction of the disk rotor 3 and bend in an arc shape around the shaft 11 of the disk rotor 3 are respectively provided. Form. At that time, the cross-sectional shape perpendicular to the center line of the fitting groove 27 is made the same as the cross-sectional shape of the fitting protrusion 18. However, a gap of 2/100 to 5/1000 mm is provided between the outer surface of the fitted protrusion 18 and the inner surface of the groove 27.

  Further, bolt receiving holes 28 (28 a,... 28 d) for screwing the connecting bolts 19 are provided in the vicinity of both end portions of the fitting grooves 27 so as to be retracted in the axial direction of the disk rotor 2. In addition, 30 (30a, 30b) is a friction pad support installation hole, and 31 (31a, 31b) is an installation hole for attaching the disc brake 1 to the lower side of the vehicle body.

  When the caliper body 3 is assembled using such caliper halves 8a and 8b, first, the fitting ridges 18a and 18b provided on the joint surfaces 17a and 17b of the caliper half 8a and the caliper halves 8b are joined. The fitting grooves 27a and 27b provided on the surfaces 26a and 26b are associated with each other, and the corresponding ends are fitted together. Then, as shown in FIG. 9, both the caliper halves 8 are rotated in opposite directions, and the respective fitting protrusions 18 are slid along the corresponding fitting grooves 27, and the respective fitting protrusions are moved. All the strips 18 are fitted into the respective fitting grooves 27. Then, both the caliper halves 8 divided by the bridge portion 6 can be integrally coupled by fitting both fitting protrusions 18 and both fitting grooves 27. Therefore, the four caliper halves 8 are further coupled using the four connecting bolts 19. Then, the coupling structure that is the basis of the caliper body 3 is completed.

  Therefore, the basic structure of the caliper body 3 is used and attached to the lower side of the vehicle body so as to straddle a part of the outer peripheral surface of the disc rotor 2, and friction pads are provided at predetermined positions of the caliper halves 8 on both sides of the disc rotor 2. After mounting 4 etc., both caliper halves 8 are further coupled using positioning bolts 12 for preventing rattling of the friction pads 4. Then, at the same time as the caliper body 3 is completed, the disc brake 1 is completed and can be mounted on the vehicle body. The pistons 9 and the like are respectively attached to the caliper halves 8 before the caliper halves 8 are coupled.

  In this way, when the disc brake 1 is mounted on the vehicle body, even if a braking reaction force that opens the joint surfaces 17 and 26 of both caliper halves 8 acts in the axial direction of the disc rotor 2 due to the braking action of the brakes, The corresponding inclined outer side surfaces of the mating ridges 18 and the corresponding inner surfaces of the respective mating grooves 27 are closely bonded to each other, and the wide distal end sides of the respective mating ridges 18 sandwich the width of the fitting groove 27. Cannot move toward the base of And since the fitting state of each protrusion 18 and the groove | channel 27 can each be kept favorable, both the caliper halves 8 do not isolate | separate.

  Therefore, even if both the caliper halves 8 are in a state in which the fitting ridges 18 are merely fitted to each other corresponding to the fitting grooves 27, a large coupling force can be obtained. Due to the reaction force, the joint surfaces 17 and 26 of both caliper halves 8 can resist deformation forces such as pulling and twisting to open the half-shape. Therefore, the joint surfaces 17 and 26 in the divided bridge portions 6 of the two caliper halves 8 are inserted in the axial direction of the disk rotor 2, and the thickness of the connecting bolt 19 that couples both the caliper halves 8 is reduced, or The split caliper body 3 can be reduced in weight or size by reducing the number of connecting bolts 19 to be used.

  In the above embodiment, both the caliper halves 8 are placed on the center line of each fitting portion between each fitting protrusion 18 provided on each caliper half 8 constituting the caliper body 3 and each fitting groove 27 corresponding thereto. Although the case where the center positions of the connecting bolts 19 to be connected are matched has been described, the center positions of the through holes 20 through which the connecting bolts 19 are inserted as shown in FIG. , 26 on the disk rotor 2 side, the coupling force by each fitting portion between each fitting protrusion 18 of each caliper half 8 and each corresponding fitting groove 27, and each fitting portion thereof The joint surfaces 17 and 27 of the two caliper halves 8 are pulled, twisted, and so on by the coupling force of the connecting bolts 19 whose center position is slightly shifted from the center line to the disk rotor 2 side. Great bonding force that can resist the deformation force It is possible to obtain.

  Further, in the above-described embodiment, both the caliper halves 8 used when the central opening 5 is provided in the bridge portion 6 of the caliper body 3 have been described. However, both the caliper halves are not provided with such a central opening. The joint surface, the fitting ridge, the fitting groove, etc. provided on can be made continuous without being divided.

  In the above embodiment, the case where the fitting protrusion 18 is provided in one caliper half 8a and the fitting groove 27 is provided in the other caliper half 8b has been described, but the fitting is performed in one caliper half. A protrusion and a fitting groove can be provided, and a fitting groove and a fitting protrusion corresponding to the other caliper half can be provided.

FIG. 4 is a longitudinal sectional view taken along line AA of FIG. 3 showing an embodiment of a disc brake for a four-wheeled vehicle to which the present invention is applied. It is a front view of the disc brake for the four-wheeled vehicle. It is a top view of the disc brake for the four-wheeled vehicle.

It is an external view of the outer caliper half which comprises the split-type caliper body of the disc brake for the four-wheel vehicles. It is an inner surface figure of the caliper half for the outside. It is an external view of the caliper half for the inner side constituting the split caliper body. It is an inner surface figure of the caliper half for the inside.

It is a fragmentary end elevation which shows the fitting protrusion vicinity of the caliper half for the outside. It is a perspective view which shows the assembly | attachment start state of the both caliper halves which comprise the division | segmentation type caliper body. It is an inner surface figure which shows the deformation | transformation form of the caliper half for the outside.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper body 4 ... Friction pad 5 ... Center part opening 6 ... Bridge part 7 ... Base plate 8 ... Caliper half body 9 ... Piston 10 ... Hydraulic chamber 11 ... Shaft 12 of disc rotor 2 ... Positioning bolts 13, 20, 21 ... Through holes 14, 23 ... Center protrusions 15, 24 ... Cylinder holes 16, 25 ... Cylindrical ends 17, 26 ... Joint surface 18 ... Fitting ridges 19 ... Connecting bolts 22 ... Oil injection hole 27 ... fitting groove 28 ... bolt receiving hole 29, 30 ... friction pad support installation hole 31 ... mounting hole

Claims (2)

A caliper half that divides the caliper body into a direction perpendicular to the axial direction of the disk rotor at the bridge portion that spans a part of the outer peripheral surface of the disk rotor and pushes the friction pads disposed on one side of both sides of the disk rotor. And the caliper half that pushes the friction pad disposed on the other side are separated from each other, the joint surfaces at the divided bridge portions of both caliper halves are butted together, and both caliper halves are further connected to the disk. A split caliper body coupling structure for a vehicle disk brake that is coupled by a connecting bolt that is inserted in the axial direction of the rotor, and protrudes in the axial direction of the disk rotor on the joint surface of one caliper half to A fitting ridge that bends in an arc shape with the center at the center is formed, a cross-sectional shape perpendicular to the center line of the fitting ridge is formed, the width of the root is narrowed, and the width of the tip is extended to both sides of the width of the root. And a wide trapezoidal shape, and a fitting groove into which the fitting protrusion is fitted is formed on the joint surface of the other caliper half with the same cross-sectional shape as the fitting protrusion. A split caliper body coupling structure for vehicle disc brakes.   The connecting bolt is inserted in the axial direction of the disk rotor in the vicinity of the fitting portion where the fitting protrusion is fitted in the fitting groove, and the center position of the connecting bolt is the center of the fitting portion. 2. A split caliper body coupling structure for a disc brake for a vehicle according to claim 1, wherein the disc caliper body is shifted to the disc rotor side from the wire.

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