Invention name: Caliper body for vehicle disc brakes
Technical field
[0001]
The present invention relates to a caliper body of a disc brake for a vehicle, and more specifically, a pair of working portions arranged to face each other with the disc rotor interposed therebetween and a bridge portion connecting the pair of acting portions straddling the outer peripheral side of the disc rotor. Regarding the caliper body of the equipped piston-opposed vehicle disc brake.
Background technology
[0002]
Conventionally, as a caliper body of a disc brake for a vehicle, a pair of action parts arranged to face each other across the disc rotor and a bridge part that straddles the outer peripheral side of the disc rotor and connects the pair of action parts are integrally provided to act. The portion has a plurality of cylinder holes provided in the circumferential direction of the disc and a hydraulic fluid communication hole for communicating the bottom sides of adjacent cylinder holes with each other, and the bridge portion is formed on the disc entry side when the vehicle is moving forward. An intermediate bridge formed between the disc entry side bridge portion, the disc exit side bridge portion formed on the disc exit side when the vehicle is moving forward, and the intermediate portion between the entry side bridge portion and the exit side bridge portion. In addition to having a portion, there was a case in which a ceiling opening was provided between the intermediate bridge portion and the disc entry side bridge portion and between the intermediate bridge portion and the disc exit side bridge portion (for example). , Patent Document 1).
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Unexamined Patent Publication No. 2011-163401
Outline of the invention
Problems to be solved by the invention
[0004]
Generally, the caliper body of a disc brake for a vehicle is provided with a pair of working parts arranged opposite to each other with the disc rotor sandwiched between them, and a bridge part straddling the outer peripheral side of the disc rotor and connecting the pair of working parts. , The disc entry side bridge portion formed on the disc entry side when the vehicle is moving forward, the disc exit side bridge portion formed on the disc exit side when the vehicle is moving forward, and the entry side bridge portion and the exit side. It has an intermediate bridge portion formed in the middle portion of the bridge portion, and has a ceiling opening between the intermediate bridge portion and the disc entry side bridge portion and between the intermediate bridge portion and the disc exit side bridge portion. In the case where each part is provided, the stress applied to the caliper body during braking is lower around the intermediate bridge part than on the disc feeding side, disc turning side, and inside in the disc radial direction, and the variation in this stress is the caliper during braking. It was one of the factors that caused the body to partially deform. Therefore, it is desired to keep the rigidity around the intermediate bridge portion of the caliper body low and maintain a good balance of stress applied to the caliper body during braking.
[0005]
However, in the above-mentioned Patent Document 1, since the hydraulic fluid communication hole is formed in a cylindrical shape on the central axis of both cylinder holes and the rigidity of the central portion of the caliper body in the radial direction of the disk is reduced, it is intermediate during braking. The difference between the stress applied around the bridge portion and the stress applied to the center portion of the caliper body in the radial direction of the disk was large. For this reason, the amount of deformation of the caliper body during braking, particularly the inner end portion in the radial direction of the disc, becomes large, and there is a risk that a good brake feeling cannot be obtained.
[0006]
Therefore, according to the present invention, the vehicle can obtain a good brake feeling by suppressing the rigidity around the intermediate bridge portion to a low level by utilizing the hydraulic fluid communication hole, maintaining a good balance of stress applied to the caliper body during braking, and obtaining a good brake feeling. It is intended to provide a caliper body for disc brakes.
Means to solve problems
[0007]
In order to achieve the above object, the caliper body of the vehicle disc brake of the present invention is arranged so as to face each other across the disc rotor, and has a pair of action parts having a cylinder part having a cylinder hole for inserting a piston inside, and the above-mentioned A bridge portion that straddles the outer peripheral side of the disc rotor and connects the pair of the working portions is provided, and the acting portion communicates with a plurality of cylinder holes provided in the circumferential direction of the disc and the bottom sides of adjacent cylinder holes. The bridge portion has a working fluid communication hole for allowing the vehicle to move forward, and the bridge portion has a disc feeding side bridge portion formed on the disc feeding side when the vehicle is moving forward and a disc turning side formed on the disc feeding side when the vehicle is moving forward. It has a side bridge portion, an intermediate bridge portion formed between the disc entry side bridge portion and the disk exit side bridge portion, and between the intermediate bridge portion and the disc entry side bridge portion. In the caliper body of a vehicle disc brake in which a ceiling opening is provided between the intermediate bridge portion and the disc feeding side bridge portion, the hydraulic fluid communication hole is formed in the central portion in the radial direction of the disc. It is characterized in that it is formed so as to be offset outward in the radial direction of the disc from the central axis of each cylinder hole.
[0008]
Further, it is preferable that the hydraulic fluid communication hole is formed at a position where a virtual plane passing through the central axes of the adjacent cylinder holes passes through the inside of the hydraulic fluid communication hole.
[0009]
Further, it is preferable that the intermediate bridge portion is formed at a position corresponding to the outer side in the radial direction of the disk of the hydraulic fluid communication hole.
[0010]
Further, the length of the gap portion formed between the opposing cylinder portions in the cylinder axial direction is formed to have a length having a minimum clearance for inserting the piston into the cylinder hole, and the pair of the above. The length of the working portion from the central axis of the cylinder hole to the inner wall of the central portion of the intermediate bridge portion in the disk rotation direction in the direction orthogonal to the central axis is from the central axis to the disk radial direction of the cylinder portion. It is preferably formed shorter than the length in the direction orthogonal to the central axis up to the inner end.
[0011]
Further, it is preferable that the axial length of the cylinder hole and the axial length of the piston are the same.
[0012]
Further, it is preferable to attach a pad spring for urging a pair of friction pads arranged so as to sandwich the disc rotor inward in the radial direction of the disc to the disc feeding side bridge portion and the disc feeding side bridge portion.
[0013]
Further, vehicle body mounting portions are provided on the disc feeding side and the disc turning side when the vehicle is moving forward, and the vehicle body mounting portion is a mounting bolt insertion hole in the disc radial direction through which the vehicle body mounting bolt is inserted. It is good to have each.
[0014]
Further, it is preferable that one of the acting portions is provided with a vehicle body mounting portion and a lightening portion is formed on the one acting portion side of the intermediate bridge portion.
[0015]
Further, the acting portion is provided with a plurality of cylinder holes provided in the circumferential direction of the disk facing each other, and the lightening portion is provided at least on both sides of the intermediate bridge portion in the disk rotation direction. It is preferable that the rib portion extending toward the bottom wall of the hole is formed by removing the meat while leaving the rib portion in the intermediate bridge portion.
[0016]
Further, it is preferable to form a second lightening portion on the other working portion side of the intermediate bridge portion.
[0017]
Further, it is preferable that the second lightening portion has a smaller projected area of ​​the caliper body from the outside in the radial direction of the disk than the lightening portion.
[0018]
Further, the acting portion is provided with a plurality of cylinder holes provided in the circumferential direction of the disk facing each other, and the second lightening portion is provided at least on both sides of the intermediate bridge portion in the disk rotation direction. It is preferable that the rib portion extending toward the bottom wall of the cylinder hole is formed by lightening while leaving the rib portion in the intermediate bridge portion.
[0019]
Further, the projected area of ​​the one acting portion from the anti-disc rotor side of the one acting portion is smaller and the depth is shallower than that of the lightening portion inside the disc radial direction. It is preferable to form a third lightening portion.
[0020]
Further, it is preferable that the vehicle body mounting portion is provided on the disc feeding side and the disc turning side when the vehicle is moving forward, and is provided with mounting bolt insertion holes in the radial direction of the disc through which the vehicle body mounting bolts are inserted.
Effect of the invention
[0021]
According to the caliper body of the disc brake for a vehicle of the present invention, the rigidity of the intermediate bridge portion can be suppressed to be low by moving the formation position of the hydraulic fluid communication hole closer to the intermediate bridge portion, and the stress applied to the caliper body during braking can be suppressed. A good balance can be maintained. As a result, it is possible to prevent the caliper body from being partially deformed during braking, and a good brake feeling can be obtained. Further, since the rigidity of the intermediate bridge portion can be suppressed to a low level without changing the shape of the appearance by using the hydraulic fluid communication hole, the appearance of the caliper body can be kept good.
[0022]
Further, the hydraulic fluid communication hole is formed at a position where a virtual plane passing through the central axis of the adjacent cylinder holes passes through the inside of the hydraulic fluid communication hole, so that the air bleeding property of the hydraulic fluid is improved. By adjusting the length outward in the radial direction of the disk, the rigidity of the intermediate bridge portion can be suppressed to an appropriately low level.
[0023]
Further, by forming the intermediate bridge portion at a position corresponding to the outside of the hydraulic fluid communication hole in the radial direction of the disk, the rigidity of the intermediate bridge portion can be accurately adjusted by finely adjusting the size, shape and position of the hydraulic fluid communication hole. Can be fine-tuned to.
[0024]
Further, by forming the length of the gap portion formed between the pair of cylinder portions facing each other in the cylinder axial direction into a length having a minimum clearance for inserting the piston into the cylinder hole, the caliper body can be formed. The length in the cylinder axial direction can be shortened. Further, the pair of action portions sets the length from the central axis of the cylinder hole to the inner wall of the central portion of the intermediate bridge portion in the disk rotation direction in the direction orthogonal to the central axis of the cylinder hole from the central axis of the cylinder portion. By forming the length to the inner end in the radial direction of the disk shorter than the length in the direction orthogonal to the central axis, the central axis of the cylinder hole and the inner wall of the bridge portion are brought close to each other to ensure the rigidity of the caliper body. The caliper body can be made smaller and lighter.
[0025]
Further, since the axial length of the cylinder hole and the axial length of the piston are the same, the length in the cylinder axial direction can be shortened, and the load (generated stress) on the bridge portion can be suppressed. Rigidity can be increased while reducing the size of the caliper body.
[0026]
Further, the bridge portion has a disc feeding side bridge portion, a disc feeding side bridge portion, and an intermediate bridge portion, and a friction pad is provided on the disc feeding side bridge portion and the disc feeding side bridge portion. By attaching the pad springs that urge the inside in the radial direction, it is possible to suppress the rattling of the friction pad without enlarging the caliper body.
[0027]
Further, vehicle body mounting portions are provided on the disc feeding side and the disc turning side when one of the acting portions is moving forward, and the vehicle body mounting portion has mounting bolt insertion holes in the disc radial direction through which the vehicle body mounting bolts are inserted. Since each is equipped, it can be applied to a radial mount type caliper body that can secure the rigidity of the caliper body.
[0028]
Furthermore, by forming a lightening portion on one of the acting portions of the intermediate bridge portion, the rigidity of the intermediate bridge portion is suppressed to a low level, the balance of stress applied to the caliper body during braking is maintained well, and the brake feeling is improved. be able to. Further, since one of the acting portions is provided with a vehicle body mounting portion and is fixed to the vehicle body, even if the rigidity of one acting portion side of the intermediate bridge portion is suppressed to be low by the lightening portion, one acting portion is used during braking. Is not likely to be deformed. Further, the lightening portion makes it possible to reduce the weight of the caliper body.
[0029]
Further, the lightening portion is formed by lightening the rib portion extending toward the bottom wall of the cylinder hole of one of the acting portions while leaving the rib portion extending toward the bottom wall of the cylinder hole in the intermediate bridge portion. The rigidity of the wall can be increased, the deformation of the caliper body during braking can be suppressed, and the brake feeling can be improved.
[0030]
Furthermore, by forming a second lightening portion on the other working portion side of the intermediate bridge portion, the rigidity of the intermediate bridge portion is further suppressed to a lower level. It is possible to maintain a good balance of stress applied to the caliper body during braking and further reduce the weight of the caliper body.
[0031]
Further, the second lightening portion formed on the other working portion side that is not fixed to the vehicle body has an intermediate bridge portion because the projected area of ​​the caliper body from the outside in the disc radial direction is smaller than that of the lightening portion. Even if the rigidity of the other acting portion is suppressed, there is no possibility that the other acting portion will be deformed during braking.
[0032]
Further, the second lightening portion is formed in a state where the rib portion extending toward the bottom wall of the cylinder hole of the other acting portion is left in the intermediate bridge portion, so that the rib portion forms the bottom wall of the cylinder hole. The rigidity can be increased, the deformation of the caliper body during braking can be suppressed, and the brake feeling can be improved.
[0033]
In addition, the projected area of ​​one acting portion from the anti-disc rotor side is smaller than that of the lightening portion in the radial direction of the disc, and the depth is shallow. By forming the portion, the caliper body can be further reduced in weight.
[0034]
Further, vehicle body mounting portions are provided on the disc feeding side and the disc turning side when one of the acting portions is moving forward, and the vehicle body mounting portion has mounting bolt insertion holes in the disc radial direction through which the vehicle body mounting bolts are inserted. When applied to each of the radial mount type caliper bodies, the disc turn-out side and turn-in side of the caliper body, which are prone to stress during braking, are fixed to the vehicle body, and the amount of deformation of the caliper body during braking is large in the disc radial direction. The deformation on the inside can be suppressed, and it is possible to reliably suppress the difference in the amount of deformation between the disc feeding side and the disc feeding side.
A brief description of the drawing
[0035]
FIG. 1 is a front view of a vehicle disc brake showing an example of one embodiment of the present invention.
[Fig. 2] Similarly, it is a rear view of a vehicle disc brake.
[Fig. 3] Similarly, it is a plan view of a vehicle disc brake.
FIG. 4 is a sectional view taken along line IV-IV of FIG.
5 is a sectional view taken along line VV of FIG. 1. FIG.
6 is a sectional view taken along line VI-VI of FIG. 1. FIG.
FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG.
8 is a sectional view taken along line VIII-VIII of FIG.
Mode for carrying out the invention
[0036]
1 to 8 are views showing an example 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.
[0037]
The vehicle disc brake 1 is arranged on both sides of the disc rotor 2, the disc rotor 2 that rotates integrally with the wheels, the monocock structure piston-opposed caliper body 3 that is attached to the vehicle body on one side of the disc rotor 2, and the disc rotor 2. A pair of friction pads 4 and 4 to be provided, a feed-in side pad spring 5 for urging the friction pads 4 and 4 on the inner side in the disc radial direction and the disc feeding side, and the friction pads 4 and 4 on the inner side in the disc radial direction. It is provided with a feeding side pad spring 6 that urges the vehicle.
[0038]
The caliper body 3 is integrally formed with a pair of action portions 3a and 3a and a bridge portion 3b that straddles the disc rotor 2 and connects the pair of action portions 3a and 3a. It is arranged in the middle of the disk insertion side bridge portion 3c to be arranged, the disk ejection side bridge portion 3d arranged on the disk ejection side, and the disk entry side bridge portion 3c and the disk ejection side bridge portion 3d. An intermediate bridge portion 3e is provided, and a first ceiling opening 3f is provided between the intermediate bridge portion 3e and the disk entry side bridge portion 3c. A second ceiling opening 3g is formed between them.
[0039]
Each working portion 3a is provided with a pair of cylinder portions 3h having cylinder holes 7 and 7 having the same diameter opened on the disc rotor 2 side arranged in the disk circumferential direction, and a piston 8 is a piston seal in each cylinder hole 7. It is housed via a 9 and a dust seal 10. A hydraulic chamber 11 to which the hydraulic fluid is supplied is defined between the bottom side of each cylinder hole 7 and the piston 8, and the adjacent hydraulic chambers 11 and 11 communicate with each other through the hydraulic fluid communication hole 12. Has been done.
[0040]
As shown in FIG. 8, each hydraulic fluid communication hole 12 is formed at a position where a virtual plane P1 connecting the central axes CL1 and CL1 of the adjacent cylinder holes 7 and 7 passes through the inside of the hydraulic fluid communication hole 12. At the same time, the central portion C1 of the working fluid communication hole 12 in the radial direction of the disk is formed so as to be offset outward in the radial direction of the disk from the central axis CL1 of each cylinder hole 7, and is formed in an elongated cross section. Further, when the caliper body 3 is attached to the vehicle body, on the disc rotation side of the caliper body 3 which is above the vehicle body, one acting portion 3a arranged on the outside of the vehicle body to the disc rotating side of the other acting portion 3a A liquid passage hole 13 is formed toward the hydraulic chamber 11 of the above, and a liquid passage hole 13 is formed from the other working portion 3a toward the hydraulic chamber 11 on the disk ejection side of the one working portion 3a. The liquid passage holes 13 and 13 are crossed, and a union hole 14 is formed in the opening of one liquid passage hole 13, and a brewer hole for mounting the brewer 15 is formed in the opening of the other liquid passage hole 13. ..
[0041]
As shown in FIG. 7, friction pad accommodating portions 3i for accommodating friction pads 4 and 4 are formed in each of the acting portions 3a and 3a, respectively. Each friction pad accommodating portion 3i is formed on the cylinder hole 7 side of the disc entry side surface 3j of the first ceiling opening 3f and on the inside of the disk entry side surface 3j in the disk radial direction. It is provided with a surface 3k and a torque receiving surface 3n on the discharge side formed on the cylinder hole 7 side and inside in the radial direction of the disk with respect to the disk rotation side surface 3m of the second ceiling opening 3g, and the disk insertion side surface 3j. There is a torque receiving surface 3p on the turning side between the and the torque receiving surface 3k on the turning side, and a torque receiving part 3q on the feeding side is located between the disc turning side surface 3m and the torque receiving surface 3n on the turning side. Each is formed. Further, an insertion side mounting recess 3r for attaching the entry side pad spring 5 is formed on the inner side surface in the disk radial direction of the central portion of the disk entry side bridge portion 3c in the disk axial direction, and the disk exit side bridge portion 3d On the inner side surface in the radial direction of the disc at the center of the disc axial direction, a feeding-side mounting recess 3s for mounting the feeding-side pad spring 6 is formed.
[0042]
In the intermediate bridge portion 3e, the first lightening portion 16 (the lightening portion of the present invention) is formed on the outer wall on the one working portion 3a side, and the second lightening portion 17 is formed on the outer wall on the other working portion 3a side. Has been done. The first lightening portion 16 is lightened in a state where a pair of rib portions 16a and 16a extending toward the outer surface of the bottom wall of the cylinder holes 7 and 7 of one of the acting portions 3a are left in the intermediate bridge portion 3e. Is formed. As shown in FIG. 3, the second lightening portion 17 is formed to have a smaller projected area in a plan view than the first lightening portion 16, that is, a projected area of ​​the caliper body 3 from the outside in the disc radial direction. A pair of rib portions 17a and 17a extending toward the outer surface of the bottom wall of the cylinder holes 7 and 7 of the other working portion 3a are formed by lightening the intermediate bridge portion 3e.
[0043]
As shown in FIG. 1, one of the acting portions 3a has a projected area at the inner end portion in the radial direction of the disk at an intermediate position on the outer surface of the bottom wall of the cylinder holes 7 and 7 as compared with the first lightening portion 16 in the front view. A third lightening portion 18 is formed which is small, that is, the projected area of ​​one of the acting portions 3a from the anti-disc rotor side is small, and the depth is shallow.
[0044]
Further, the caliper body 3 is provided with mounting boss portions 19 and 19 (vehicle body mounting portions of the present invention) in the radial direction of the disc on the disc feeding side and the disc turning side of one of the acting portions 3a, and each mounting boss portion. It is a radial mount type caliper body in which mounting bolt insertion holes 19a in the radial direction of the disc are formed in 19, and each mounting boss portion 19 and a caliper mounting portion (not shown) provided on the vehicle body side are mounted. It is connected by a vehicle body mounting bolt (not shown) that is inserted into the bolt insertion hole 19a.
[0045]
Further, as shown in FIG. 6, the caliper body 3 has a length L3 of a gap formed between the opposing cylinder portions 3h and 3h in the cylinder axial direction when the piston 8 is assembled to the caliper body 3. It is formed to have a length having a minimum clearance for inserting the piston 8 into the cylinder hole 7, and further, the axial length L2 of the cylinder hole 7 and the axial length L6 of the piston 8 are substantially the same. As shown in FIG. 7, the pair of action portions 3a and 3a are perpendicular to the central axis CL1 from the central axis CL1 of the cylinder hole 7 to the inner wall 3t of the intermediate bridge portion 3e. The length L4 is formed shorter than the length L5 in the direction orthogonal to the central axis CL1 from the central axis CL1 to the inner end of the cylinder portion 3h in the disc radial direction.
[0046]
Each friction pad 4 is composed of a lining 4a that is in sliding contact with the side surface of the disc rotor 2 and a metal back plate 4b to which the lining 4a is attached. Ear pieces 4c and 4c are projected from the disc entry side and the disk ejection side on the outer side of the back plate 4b in the disc radial direction, and the ear pieces 4c and 4c are used as the entry side torque receiving portion 3p and the ejection side. By supporting the torque receiving stage portion 3q, the friction pads 4 and 4 are supported so as to be movable in the disc axial direction. Further, a pair of projecting pieces 4d and 4d projecting outward in the disc radial direction are provided on the outer surface of the back plate 4b in the radial direction of the disc on the pad center side of the ear pieces 4c and 4c, and the pair of projecting pieces are provided. A recess 4e is formed on the outer surface in the radial direction of the disk between them.
[0047]
In this embodiment, as described above, by moving the formation position of the hydraulic fluid communication hole 12 closer to the intermediate bridge portion 3e, the rigidity of the intermediate bridge portion 3e can be suppressed to a low level, and the balance of stress applied to the caliper body 3 during braking can be suppressed. Can be kept good. As a result, it is possible to prevent the caliper body 3 from being deformed during braking, and a good brake feeling can be obtained. Further, by utilizing the hydraulic fluid communication hole 12, the rigidity of the intermediate bridge portion can be suppressed to be low without changing the shape of the appearance, and the appearance of the caliper body 3 can be kept good.
[0048]
Further, the hydraulic fluid communication hole 12 is formed at a position where the virtual plane P1 connecting the central axes CL1 and CL1 of the adjacent cylinder holes 7 and 7 passes through the inside of the hydraulic fluid communication hole 12, and the hydraulic fluid communication hole 12 is formed. Since the central portion C1 of the disk 12 in the radial direction of the disk is formed so as to be offset outward from the central axis CL1 of each cylinder hole 7 in the radial direction of the disk and is formed in an oval cross section, the air bleeding property of the working fluid can be improved. It can be made good, and the rigidity of the intermediate bridge portion 3e can be suppressed to be appropriately low by adjusting the length outward in the radial direction of the disk.
[0049]
Further, by forming the intermediate bridge portion 3e at a position corresponding to the outer side of the hydraulic fluid communication hole 12 in the radial direction of the disk, the size, shape and position of the hydraulic fluid communication hole 12 can be finely adjusted to form the intermediate bridge portion 3e. The rigidity of the can be finely adjusted. Further, mounting bolt insertion holes 19a are formed on the disc feeding side and the disc turning side of one of the acting portions 3a, respectively, and a caliper mounting portion provided with mounting bolts inserted into the mounting bolt insertion holes 19a on the vehicle body side. By screwing the caliper body 3 into the vehicle body, the amount of deformation of the caliper body during braking is large. This can be reliably suppressed.
[0050]
Further, as described above, the caliper body 3 has an intermediate bridge formed by forming a first lightening portion 16 on one acting portion side of the intermediate bridge portion 3e and a second lightening portion 17 on the other acting portion side. It is possible to suppress the rigidity of the portion 3e to a low level, maintain a good balance of stress applied to the caliper body 3 during braking, and improve the brake feeling. Further, since one of the acting portions 3a is fixed to the vehicle body by the mounting bolts inserted into the mounting boss portions 19 and 19, it is intermediated by the first lightening portion 16.Even if the rigidity of one of the bridge portions 3e on the acting portion side is suppressed to a low level, there is no possibility that the one acting portion 3a will be deformed during braking.
[0051]
Further, the first lightening portion 16 is lightened in a state where the rib portions 16a and 16a extending toward the bottom walls of the cylinder holes 7 and 7 provided in one of the acting portions 3a are left in the intermediate bridge portion 3e. The second lightening portion 17 is also formed in a state in which the rib portions 17a and 17a extending toward the bottom walls of the cylinder holes 7 and 7 provided in the other working portion 3a are left in the intermediate bridge portion 3e. The rib portions 16a, 16a, 17a, 17a can increase the rigidity of the bottom wall of each cylinder hole 7, suppress the deformation of the caliper body 3 during braking, and improve the brake feeling. Can be planned. Further, by providing the first lightening portion 16, the second lightening portion 17, and the third lightening portion 18, the weight of the caliper body 3 can be reduced.
[0052]
Further, as described above, in the caliper body 3, the length L3 of the gap portion formed between the opposing cylinder portions 3h and 3h in the cylinder axial direction causes the piston 8 to be assembled to the caliper body 3. The length of the caliper body 3 in the direction of the central axis CL1 of the cylinder hole 7 can be shortened by being formed to have a length having a minimum clearance for insertion into the cylinder hole 7. Further, the length L4 from the central axis CL1 of the cylinder hole 7 to the inner wall 3t of the intermediate bridge portion 3e in the direction orthogonal to the central axis CL1 is extended from the central axis CL1 to the inner end of the cylinder portion 3h in the disk radial direction. By forming the length shorter than the central axis CL1 and the length L5 in the direction orthogonal to the central axis CL1, the central axis CL1 of the cylinder hole 7 and the inner wall 3t of the intermediate bridge portion 3e are brought close to each other to ensure the rigidity of the caliper body 3. The caliper body 3 can be made smaller and lighter.
[0053]
Further, since the axial length L2 of the cylinder hole 7 and the axial length L6 of the piston 8 are the same, the length of the caliper body 3 in the cylinder axial direction can be shortened, and the bridge portion 3b The load (generated stress) on the caliper body 3 can be suppressed, and the caliper body 3 can be miniaturized and the rigidity can be increased.
[0054]
Further, the disc feeding side bridge portion 3d and the disc feeding side bridge portion 3c are provided with a feeding side pad spring 5 for urging friction pads 4 and 4 inward in the radial direction of the disc, and a feeding side pad spring 6. By attaching each of them, it is possible to suppress the rattling of the friction pad without enlarging the caliper body. Further, by integrally forming the pair of action portions 3a and 3a and the bridge portion 3b, the rigidity of the caliper body 3 can be further increased.
[0055]
The caliper body 3 of the present invention is not limited to the caliper body formed in the 4-pot piston opposed type as in the above-described embodiment, and may have three or more pistons arranged facing each other. Further, the diameter of the cylinder hole is arbitrary, and pistons having different diameters may be arranged so as to face each other. Further, the length in the radial direction of the hydraulic fluid communication hole disk is not limited to the one longer than the radius of the cylinder hole and is arbitrary.
[0056]
Further, the caliper body of the present invention is not limited to the monocoque structure as in the above-described embodiment, and can be applied to a split type caliper body. Further, the caliper body is not limited to the radial mount type, and a pair of vehicle body mounting portions are projected from the working portion, and mounting bolt insertion holes in the disk axial direction for inserting the vehicle body mounting bolts are formed in the vehicle body mounting portions. It can also be applied to the axial mount type caliper body.
[0057]
Further, in the piston-opposed caliper body of 6 pots or more, the rib portion formed in the intermediate bridge portion extends at least toward the bottom wall of the cylinder hole provided on both sides of the intermediate bridge portion in the disk rotation direction. It suffices if it is extended, and it may be provided so as to extend toward the bottom walls of all the cylinder holes, or it may be provided so as to extend toward the bottom walls of the cylinder holes provided at both ends in the disk rotation direction. be. Further, it does not matter if the second lightening portion and the third lightening portion are not provided, and it is not necessary to form the lightening portion with the rib portion left.
Code description
[0058]
1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... Acting part, 3b ... Bridge part, 3c ... Disc feeding side bridge part, 3d ... Disc feeding side bridge part, 3e ... Intermediate bridge part 3, 3f ... 1st ceiling opening, 3g ... 2nd ceiling opening, 3h ... Cylinder part, 3i ... Friction pad accommodating part, 3j ... Disc insertion side surface, 3k ... Intrusion side torque receiving surface, 3m ... Disc rotation Side surface, 3n ... Feeding side torque receiving surface, 3p ... Turning side torque receiving part, 3q ... Turning side torque receiving part, 3r ... Turning side mounting recess, 3s ... Turning side mounting recess, 3t ... Inner wall 4, 4 ... Friction pad, 4a ... Lining, 4b ... Back plate, 4c ... Ear piece, 4d ... Projection piece, 4e ... Recess, 5 ... Enter side pad spring, 6 ... Exit side pad spring, 7 ... Cylinder hole, 8 ... Piston, 9 ... Piston seal, 10 ... Dust seal, 11 ... Hydraulic chamber, 12 ... Hydraulic fluid communication hole, 13 ... Liquid passage hole, 14 ... Union hole, 15 ... Brewer, 16 ... First lightening part, 16a ... Rib part, 17 ... 2nd lightening part, 17a ... Rib part, 18 ... 3rd lightening part, 19 ... Mounting boss part, 19a ... Mounting bolt insertion hole
The scope of the claims
[Claim 1]
A pair of working parts having a cylinder part internally provided with a cylinder hole for inserting a piston, which is arranged so as to face each other across the disc rotor, and a bridge part connecting the pair of the working parts across the outer peripheral side of the disc rotor. The working portion has a plurality of cylinder holes provided in the circumferential direction of the disc and a hydraulic fluid communication hole for communicating the bottom sides of adjacent cylinder holes with each other, and the bridge portion is used when the vehicle is moving forward. The disc feeding side bridge portion formed on the disc feeding side, the disc feeding side bridge portion formed on the disc feeding side when the vehicle is moving forward, the disc feeding side bridge portion, and the disc feeding side bridge. It has an intermediate bridge portion formed in the middle portion of the portion, and is between the intermediate bridge portion and the disc entry side bridge portion, and between the intermediate bridge portion and the disc exit side bridge portion. In the caliper body of a vehicle disc brake provided with ceiling openings, the hydraulic fluid communication hole is formed so that the central portion in the radial direction of the disc is offset outward in the radial direction of the disc from the central axis of each cylinder hole. A caliper body for vehicle disc brakes.
[Claim 2]
The vehicle disc brake according to claim 1, wherein the hydraulic fluid communication hole is formed at a position where a virtual plane passing through the central axes of the adjacent cylinder holes passes through the inside of the hydraulic fluid communication hole. Caliper body.
[Claim 3]
The caliper body of a vehicle disc brake according to claim 1 or 2, wherein the intermediate bridge portion is formed at a position corresponding to the outer side of the hydraulic fluid communication hole in the radial direction of the disc.
[Claim 4]
The length of the gap portion formed between the opposing cylinder portions in the cylinder axial direction is formed so as to have a minimum clearance for inserting the piston into the cylinder hole, and the pair of the acting portions. Is that the length from the central axis of the cylinder hole to the inner wall of the central portion of the intermediate bridge portion in the disc rotation direction in the direction orthogonal to the central axis is inside the disk radial direction of the cylinder portion from the central axis. The caliper body of a vehicle disc brake according to claim 1, wherein the caliper body of the vehicle disc brake according to claim 1 is formed so as to be formed shorter than the length in the direction orthogonal to the central axis up to the end portion.
[Claim 5]
The caliper body of a vehicle disc brake according to claim 4, wherein the axial length of the cylinder hole and the axial length of the piston are the same.
[Claim 6]
A feature is that pad springs are attached to the disc feeding side bridge portion and the disc feeding side bridge portion to urge a pair of friction pads arranged so as to sandwich the disc rotor inward in the radial direction of the disc. The caliper body of the vehicle disc brake according to claim 4 or 5.
[Claim 7]
On the other hand, vehicle body mounting portions are provided on the disc feeding side and the disc turning side when the vehicle is moving forward, and the vehicle body mounting portions have mounting bolt insertion holes in the radial direction of the disc into which the vehicle body mounting bolts are inserted. The caliper body of a vehicle disc brake according to any one of claims 1 to 6, wherein the caliper body is provided.
[Claim 8]
The caliper for a vehicle disc brake according to claim 1, wherein one of the acting portions includes a vehicle body mounting portion and a lightening portion is formed on one acting portion side of the intermediate bridge portion. body.
[Claim 9]
The working portion is provided with a plurality of cylinder holes provided in the circumferential direction of the disc facing each other, and the lightening portion is at least the cylinder holes provided on both sides of the intermediate bridge portion in the disc rotation direction. The caliper body of a vehicle disc brake according to claim 8, wherein the rib portion extending toward the bottom wall is formed by removing the lightening while leaving the rib portion extending toward the bottom wall in the intermediate bridge portion.
[Claim 10]
The caliper body of a vehicle disc brake according to claim 8 or 9, wherein a second lightening portion is formed on the other working portion side of the intermediate bridge portion.
[Claim 11]
The caliper body of a vehicle disc brake according to claim 10, wherein the second lightening portion has a smaller projected area of ​​the caliper body from the outside in the disc radial direction than the lightening portion.
[Claim 12]
The working portion is provided with a plurality of cylinder holes provided in the circumferential direction of the disc facing each other, and the second lightening portion is provided at least on both sides of the intermediate bridge portion in the disc rotation direction. The caliper body of a vehicle disc brake according to claim 10 or 11, wherein a rib portion extending toward the bottom wall of the hole is formed by lightening the rib portion while leaving the intermediate bridge portion.
[Claim 13]
A third portion of the one acting portion that is projected inward in the radial direction of the disk from the lightening portion and that the projected area of ​​the one acting portion from the anti-disc rotor side is smaller than that of the lightening portion and has a shallow depth. The caliper body of a vehicle disc brake according to any one of claims 8 to 12, wherein a lightening portion is formed.
[Claim 14]
The vehicle body mounting portion is provided on the disc feeding side and the disc turning side when the vehicle is moving forward, and is provided with mounting bolt insertion holes in the radial direction of the disc into which the vehicle body mounting bolts are inserted. The caliper body of the vehicle disc brake according to any one of items 8 to 13.