Technical field
[0001]
The present invention relates to a caliper body for vehicle disc brakes.
Background technology
[0002]
Conventionally, a caliper body of a vehicle disc brake has been formed by connecting an action portion having a cylinder hole and a reaction portion having a reaction claw with a bridge portion (see, for example, Patent Document 1). .
prior art documents
patent literature
[0003]
Patent Document 1: Japanese Patent No. 5674409
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0004]
For the caliper body like the above-mentioned Patent Document 1, weight reduction has been desired. In addition, in the case of forming the caliper body by casting, it has been desired to improve the flowability of molten metal during casting.
[0005]
An object of the present invention is to provide a caliper body for a vehicle disc brake, which can be made lighter and, in the case of being formed by casting, can also improve the flowability of molten metal.
Means to solve problems
[0006]
In order to achieve the above object, a caliper body of a vehicle disc brake according to the present invention includes an action portion provided with a cylinder hole, which is arranged on the side of a disc rotor, and a bridge portion arranged across the disc rotor. In the vehicle disc brake caliper body, the bridge portion is formed with a lightening portion that gradually becomes thinner toward the center portion in the axial direction of the disc.
[0007]
Further, it is preferable that the cutout portion is formed with an inclined surface that gradually becomes thinner toward the central portion in the axial direction of the disk.
[0008]
Further, the caliper body is formed by connecting the action portion and a reaction portion having a plurality of reaction claws at the bridge portion, and the reaction portion is located at an intermediate portion between the adjacent reaction claws. , it is preferable that a reaction claw side lightening portion is formed which is concave toward the outer circumference of the disk.
[0009]
Also, the caliper body is formed by casting, the bridge portion has a sprue trace formed by cutting the sprue after casting the caliper body on the outer surface, and the lightening portion is provided on the inner surface corresponding to the sprue trace. It is preferable that it is formed.
Effect of the invention
[0010]
According to the caliper body of the vehicle disc brake of the present invention, the weight of the caliper body can be reduced by forming the lightening portion in the bridge portion, the thickness of which gradually decreases toward the central portion in the disc axial direction.
[0011]
Further, the lightening portion can be easily formed by forming an inclined surface that gradually becomes thinner toward the central portion in the axial direction of the disk.
[0012]
Further, in the caliper body formed by connecting the action portion and the reaction portion provided with the reaction force claw by the bridge portion, the reaction force claw concave toward the outer circumference of the disk is provided in the intermediate portion between the adjacent reaction force claws. Since the side lightening portion is formed, the weight of the caliper body can be further reduced.
[0013]
Furthermore, the caliper body is formed by casting, and has sprue marks on the outer surface of the bridge portion formed by cutting the sprue after casting the caliper body, and a lightening portion is formed on the inner surface of the bridge portion corresponding to the sprue mark. As a result, the molten metal flows well from the sprue provided in the bridge portion toward the action portion side and the reaction portion side, so that the casting time can be shortened and the quality of the cast product can be improved.
Brief description of the drawing
[0014]
1 is a cross-sectional view taken along line II of FIG. 2;
2 is a front view of a caliper body showing one embodiment of the present invention; FIG.
[Fig. 3] Fig. 3 is a rear view of the same caliper body.
[Fig. 4] Fig. 4 is a front view of the same vehicle disc brake.
5 is a cross-sectional view taken along the line VV in FIG. 4. FIG.
6 is a partially cross-sectional plan view of a vehicle disc brake showing an embodiment of the present invention; FIG.
7 is a cross-sectional view taken along line VII-VII of FIG. 6; FIG.
[Fig. 8] Fig. 8 is an explanatory diagram showing a casting state of a caliper body.
9 is a cross-sectional view taken along line IX-IX of FIG. 8;
MODE FOR CARRYING OUT THE INVENTION
[0015]
1 to 7 are diagrams showing one embodiment of a caliper body of a vehicle disc brake according to the present invention. Arrow A indicates the direction of rotation of a disc rotor that rotates integrally with a wheel when the vehicle moves forward. The outflow side and disc inflow side are those when the vehicle is moving forward.
[0016]
A vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a rear wheel, a caliper bracket 3 that is fixed to a vehicle body, and slide pins 4, 4 that allow the caliper bracket 3 to move in the disc axial direction. It comprises a supported caliper body 5 and a pair of friction pads 6, 6 arranged between an action portion 5a and a reaction portion 5b of the caliper body 5 so as to face each other with the disc rotor 2 interposed therebetween.
[0017]
The caliper bracket 3 includes a turn-out side caliper support arm 3a and a turn-in side caliper support arm 3b. 6 accommodating portions 3c are formed. A U-shaped torque receiving portion 3d is provided on the side surface of the output-side caliper support arm 3a on the accommodating portion side, and the distal end side of the output-side caliper support arm 3a straddles the outer circumference of the disk rotor 2. A caliper support arm 3e projects in the axial direction of the disk, and a bag-shaped slide pin insertion hole 3f is formed in the caliper support arm 3e.
[0018]
The caliper body 5 is formed by casting, and is configured by connecting the action portion 5a and the reaction portion 5b disposed on both sides of the disc rotor 2 with a bridge portion 5c straddling the outer periphery of the disc rotor 2. Between the portion 5a and the reaction portion 5b, the pair of friction pads 6, 6 are arranged to face each other with the disk rotor 2 interposed therebetween.
[0019]
The action portion 5a is formed by opening a bottomed cylinder hole 5d on the disk rotor side, in which the piston 7 is movably inserted. A chamber 8 is defined. The action portion 5a is provided with vehicle body mounting arms 5e, 5e protruding toward the disk exit side and the disc radial direction inner side, and guide arms 5f, 5f are provided on the disk entry side of the action portion 5a and the reaction portion 5b. protruded.
[0020]
The bridge portion 5c has a sprue trace 5g formed by cutting the sprue 21 after casting the caliper body 5 on the outer surface, and the inner surface 5h corresponding to the sprue trace 5g is gradually thinned toward the central portion C1 in the disk axial direction. A lightening portion 5j formed by the inclined surfaces 5i, 5i is provided.
[0021]
The reaction portion 5b is provided with a pair of reaction claws 5k, 5k. Between the reaction claws 5k, 5k is an inverted U-shaped opening that opens toward the center of the disc at a position corresponding to the cylinder hole 5d. A part 5m is formed. Further, in the intermediate portion of the opening 5m, there is formed a reaction claw side lightening portion 5n which is concave toward the outer circumference of the disc. It has a pair of reaction claw side inclined surfaces 5p, 5p that are concave in a triangular shape.
[0022]
Each friction pad 6 is constructed by bonding a lining 6a, which is in sliding contact with the side surface of the disk rotor 2, to a metal back plate 6b. The lugs 6c, which are suspended by the hanger pins 9 and protrude from the back plate 6b toward the disc-running side, are held by the torque receiving portions 3d of the caliper bracket 3, and are supported so as to be movable in the disc axial direction.
[0023]
The caliper body 5 has a slide pin 4 protruding toward the disc rotor side from a vehicle body mounting arm 5e. A slide pin 4 is protruded from the portion 3g toward the side opposite to the disc rotor, and the slide pin 4 is inserted into the vehicle body mounting arm 5e of the caliper body 5, thereby supporting the disc rotor so as to be movable in the axial direction.
[0024]
In the vehicle disc brake 1 formed in this manner, when hydraulic fluid pressurized by a separate hydraulic pressure master cylinder is supplied to the hydraulic pressure chamber 8 during braking, the piston 7 is pushed toward the disc rotor. The friction pad 6 on the working portion side is pressed against one side surface of the disc rotor 2 . Next, the caliper body 5 moves toward the action portion while being guided by the slide pins 4, 4 due to the reaction force, and the reaction claws 5k, 5k press the friction pad 6 on the reaction portion side to the other side surface of the disk rotor 2, A braking action takes place.
[0025]
As shown in FIGS. 8 and 9, the caliper body 5 of this embodiment is cast using a caliper body casting mold 23 which is a combination of a plurality of molds 22. The bridge portion 5c of the caliper body casting mold 23 is The sprue 21 is provided in the portion to be formed. The molten metal introduced from the sprue 21 smoothly flows to the action portion 5a side and the reaction portion 5b side while being guided by the inclined surfaces 5i, 5i forming the lightening portion 5j, as indicated by the arrows. After casting, the caliper body casting is subjected to machining of the sprue 21 to form a sprue trace 5g, and is subjected to finishing, threading, and the like to form the caliper body 5 .
[0026]
As described above, in the caliper body 5 of the present embodiment, the sprue 21 is provided in the bridge portion 5c located in the central portion of the caliper body 5 during casting, and the molten metal is introduced from the sprue 21, and the sprue mark 5g is formed. The inner surface 5h is provided with a lightening portion 5j formed of inclined surfaces 5i, 5i that gradually become thinner toward the central portion in the axial direction of the disk. It flows well in the mold 23, improving the flowability of the molten metal. The molten metal smoothly flows over the reaction claws 5k and 5k while being guided by the claw-side inclined surfaces 5p and 5p, so that the casting time can be shortened and the quality of the cast product can be improved. Further, the weight of the caliper body 5 can be reduced by the lightening portion 5j and the reaction force claw side lightening portion 5n.
[0027]
It should be noted that the caliper body of the vehicle disc brake of the present invention is not limited to being formed by casting as in the above embodiment, but may be formed by forging. can be achieved. Moreover, the number of pistons is arbitrary, and the number of reaction claws is also arbitrary accordingly. Further, the shape of the lightening portion may be any shape such as an arcuate surface as long as the shape gradually becomes thinner toward the central portion in the axial direction of the disk. Further, the reaction force claw side lightening portion may not be provided. Further, the caliper body of the present invention is not limited to a pin slide type caliper body having an action portion, a reaction portion, and a bridge portion, and can also be applied to a piston facing type caliper body.
Code explanation
[0028]
DESCRIPTION OF SYMBOLS 1... Vehicle disc brake 2... Disc rotor 3... Caliper bracket 3a... Outlet-side caliper support arm 3b... Inlet-side caliper support arm 3c... Accommodating part 3d... Torque receiving part 3e... Caliper support Arm 3f Slide pin insertion hole 3g Slide pin attachment portion 4 Slide pin 5 Caliper body 5a Action portion 5b Reaction portion 5c Bridge portion 5d Cylinder hole 5e Car body attachment arm 5f... guide arm 5g... sprue mark 5h... inner surface 5i... sloped surface 5j... lightening part 5k... reaction claw 5m... opening 5n... reaction claw side lightening part 5p... Reaction claw side inclined surface 6 Friction pad 6a Lining 6b Back plate 6c Ear piece 7 Piston 8 Fluid pressure chamber 9 Hanger pin 21 Sprue 22 Mold 23 …caliper body casting mold

We Claim:

The scope of the claims

[Claim 1]
In a caliper body for a vehicle disc brake, the caliper body for a vehicle disc brake includes an action portion having a cylinder hole disposed on a side portion of a disc rotor, and a bridge portion disposed across the disc rotor, wherein the bridge portion extends in the disc axial direction. A caliper body for a vehicle disc brake, characterized in that a lightening portion that gradually becomes thinner toward a central portion is formed.
[Claim 2]
2. A caliper body for a vehicle disc brake according to claim 1, wherein said recessed portion is formed with an inclined surface that gradually becomes thinner toward said central portion in the axial direction of the disc.
[Claim 3]
The caliper body has the action portionand a reaction portion provided with a plurality of reaction claws are connected by the bridge portion, and the reaction portion is concave toward the outer circumference of the disk at an intermediate portion of the adjacent reaction claws. 3. The caliper body of a vehicle disc brake according to claim 1, wherein a reaction force pawl side lightening portion is formed.
[Claim 4]
The caliper body is formed by casting, the bridge portion has a sprue mark formed on the outer surface thereof by cutting the sprue after casting the caliper body, and the lightening portion is formed on the inner surface corresponding to the sprue mark. A caliper body for a vehicle disc brake according to any one of claims 1 to 3, characterized in that the caliper body is