JP2011185298A - Caliper body of disk brake for vehicle - Google Patents

Abstract

[PROBLEMS] To provide a caliper for a disc brake for a vehicle that can be satisfactorily attached to both the left and right sides of a vehicle body while reducing the number of parts and reducing the size of the caliper body, and that can perform air bleed operation at once. Provides a body.
SOLUTION: In each bridge portion 3b, a first liquid passage hole 12 opened to the bottom side of the cylinder hole 4 of the concave portion 11a, 11b and one working portion 3a, the concave portion 11a, 11b, and the other acting portion 3a. The second liquid passage hole 13 that opens to the bottom side of the cylinder hole 4, the first liquid passage hole 12, and the second liquid passage hole 13 communicate with each other, and the communication passage in the disk axial direction that opens to the outer surface of the action portion 3a. 14. With the caliper body 3 attached to the vehicle body, the opening of the communication passage 14 disposed above the vehicle body is used as a bleeder hole 15, and the first liquid passage hole 12 and the second liquid passage hole 13 formed in the recesses 11 a and 11 b. The openings 12 a and 13 a are sealed with a sealing plug 17.
[Selection] Figure 1

Description

  The present invention relates to a caliper body of a disc brake for a vehicle, and more particularly to a structure of a caliper body of a monocoque structure piston facing type in a disc brake used in various traveling vehicles such as a motorcycle and an automobile.

  As a vehicular disc brake, a pair of working portions arranged on both sides of the disc rotor and provided with cylinder holes and a pair of bridge portions provided on the disc entrance side and the disc exit side when the vehicle moves forward are integrated. A formed caliper body of a formed monocoque piston-opposed vehicle disc brake is known. As such a caliper body, the caliper body is formed in a symmetrical shape with respect to a center line passing through the disc shaft and the caliper body central portion, and the adjacent cylinder holes are communicated with each other through the liquid passage hole, and the disc inlet side and the disc A cylinder hole that is connected to either one of the delivery sides using a pipe member, and a through hole that opens on the outer surface of the working portion to the cylinder bore that faces the other side of the disc delivery side and the disc delivery side And a bleeder hole is formed in the opening of the through hole so that it can be attached to either the left or right side of the vehicle body with one type of caliper body (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 1-210628

  However, since the pipe material is disposed outside the caliper body, the number of parts is increased and the entire caliper body including the pipe material is enlarged. Further, when bleeding the hydraulic path, the bleeder screws attached to both bleeder holes must be loosened alternately to release the air, and the bleed operation has to be performed twice.

  Accordingly, the present invention provides a vehicle disc brake that can be mounted on either the left or right side of the vehicle body while reducing the number of parts and reducing the size of the caliper body, and can perform the air bleeding operation in one operation. The purpose is to provide a caliper body.

  In order to achieve the above object, according to a caliper body of a disc brake for a vehicle of the present invention, a pair of operating portions disposed on both sides of the disc rotor and provided with cylinder holes, a disc entry side and a disc when the vehicle moves forward In a caliper body of a monocoque piston-opposed vehicle disc brake integrally formed with a pair of bridge portions provided on the delivery side, each bridge portion includes a disc rotor outer peripheral ceiling surface and one action portion. A first liquid through hole that opens to the bottom side of the cylinder hole, a second liquid through hole that opens to the disk rotor outer peripheral side ceiling surface and the bottom side of the cylinder hole of the other working part, and The caliper body includes a first fluid passage hole and a second fluid passage hole, and a communication passage in the disk axial direction that opens to the outer surface of the action portion. Is attached to the vehicle body, a bleeder hole for discharging the air in the working fluid is formed in the opening of at least one of the communication passages arranged above the vehicle body, and each of the bridge portions is formed on the outer surface of the bridge portion. The first liquid passage hole and the opening of each of the second liquid passage holes are sealed by sealing means.

  Further, both the communication passages are opened to one working portion, bleeder holes are respectively formed in the opening portions of the both communication passages, and hydraulic fluid is supplied to the one working portion on the bottom side of the cylinder hole. A union hole and a pair of vehicle body attachment portions are provided, and the bleeder hole, the vehicle body attachment portion, the first liquid passage holes formed in both the bridge portions, and the second liquid passage holes are provided. The communication paths are formed symmetrically with respect to a first reference plane that passes through a disc shaft and a caliper body central portion in plan view of the caliper body, and the union holes are formed on the first reference plane. The first liquid passage hole and the second liquid passage hole of each of the bridge portions are respectively surfaces with respect to a second reference plane that is parallel to the side surface of the disk rotor and passes through the caliper body central portion. It may be formed symmetrically

  Further, the sealing means includes a sealing portion that seals an opening side of each first liquid passage hole and each second liquid passage hole formed on the outer surface of each bridge portion, and is continuous with the sealing portion. A shaft that is inserted into the first liquid passage hole or the second liquid passage hole with a length that reaches the intersection where the first liquid passage hole or the second liquid passage hole intersects the communication path. It is suitable that it is a sealing stopper provided with a part.

  According to the caliper body of the disc brake for a vehicle of the present invention, the first fluid passage hole, the second fluid passage hole, and the communication passage allow the hydraulic chambers facing the both sides of the disc rotor without increasing the size of the caliper body. Can communicate. In addition, with the caliper body attached to the vehicle body, a bleeder hole is formed in the opening of at least one of the communication passages arranged above the vehicle body, so that one type of caliper body is placed on the left or right side of the vehicle body. It can be attached and the cost can be reduced. Furthermore, air can be vented satisfactorily by one air venting operation, and workability can be improved.

  In addition, both communication passages are opened in one working portion, bleeder holes are formed in the opening portions of the both communication passages, and a union hole and a vehicle body mounting portion are provided in the one working portion. The hole, the vehicle body mounting portion, the first fluid passage holes, the second fluid passage holes, and the communication passages are symmetrical with respect to the first reference plane that passes through the disc shaft and the caliper body center. The union hole is formed on the first reference surface, and the first liquid passage hole and the second liquid passage hole of each bridge portion are parallel to the side surface of the disk rotor and pass through the central portion of the caliper body. By forming them symmetrically with respect to the second reference plane, it is possible to improve the workability of the caliper body. Also, since the bleeder holes are formed on both sides of the caliper body in the disc rotation direction, depending on the mounting position of the caliper body to the vehicle body, by selecting one of the bleeder holes above the vehicle body, Regardless of the mounting position, good air venting can be ensured.

  Furthermore, the shaft portion of the sealing plug that seals the opening side of the first liquid passage hole and the second liquid passage hole fills a portion that is not used as the oil passage of the first liquid passage hole and the second liquid passage hole. For this reason, it is possible to reduce as much as possible the portion where air easily accumulates, and to improve the air venting performance of the hydraulic path.

It is a top view of the disc brake for vehicles which shows one example of the present invention. It is a front view of the disk brake for vehicles similarly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is an expanded sectional view of a sealing stopper similarly.

  1 to 3 show a disk brake for a vehicle according to an embodiment of the present invention, and an arrow A in the figure indicates the rotational direction of the disk rotor during forward traveling of the vehicle. The side and the disk delivery side are when the vehicle is traveling forward.

  The vehicular disc brake 1 includes a pair of action portions 3a and 3a arranged opposite to each other with a disc rotor 2 interposed therebetween, and a pair of bridge portions 3b and 3b provided on the disc feed-in side and the disc feed-out side. The formed caliper body 3 has a monocoque structure.

  Each operating portion 3a, 3a is provided with two cylinder holes 4 opened on the disk rotor 2 side so as to face each other. In each cylinder hole 4, a piston 5 is accommodated via a piston seal 6, and is formed in a four-pot piston facing type. Between the bottom of each cylinder hole 4 and the bottom surface of each piston 5, The hydraulic chambers 7 to which the hydraulic fluid is supplied are defined, and the adjacent hydraulic chambers 7 and 7 communicate with each other through the hydraulic chamber communication portions 7a and 7a.

  On the opening side of the cylinder hole 4, friction pads 8 composed of a lining 8 a and a back plate 8 b are arranged to face each other so as to sandwich the disk rotor 2. The friction pad 8 is suspended by a pair of leg portions 9a, 9a of a hanger pin 9 spanning the disk rotor and straddling the outer periphery of the disk rotor, and torques provided respectively on the disk inlet side and the outlet side. It is movable between the receiving portions 3c and 3c in the disk axis direction.

  On the disk entrance side and the disk exit side of one working portion 3a, there are provided mounting bolt insertion holes 3d, 3d (vehicle body mounting portions of the present invention) in the radial direction of the disk, and these mounting bolt insertion holes 3d, The caliper body 3 is attached to the vehicle body by screwing a mounting bolt inserted through 3d into a caliper mounting portion provided on the vehicle body side. Further, a union hole 10 is formed from the outer surface of the same action part 3a toward the hydraulic chamber communication part 7a.

  On the ceiling surfaces of the bridge portions 3b and 3b on the disk inlet side and disk outlet side, recesses 11a and 11b having an elliptical shape in plan view are formed, respectively. The bridge portion 3b on the disk entry side includes a first liquid passage hole 12 that opens to the recess portion 11a of the bridge portion 3b and the bottom side of the cylinder hole 4 on the disk introduction side of one action portion 3a, and the recess portion. 11a and the second liquid passage hole 13 which opens to the bottom side of the cylinder hole 4 on the disk entry side of the other action portion 3a, and the first liquid passage hole 12 and the second liquid passage hole 13 are connected to each other. One end is provided with a communication path 14 in the disk axial direction that opens to the outer surface of one working portion 3a. Further, in the bridge portion 3b on the disk delivery side, similarly to the bridge portion 3b on the disk delivery side, the concave portion 11b of the bridge portion 3b and the bottom side of the cylinder hole 4 on the disk delivery side of one action portion 3a. A first liquid passage hole 12 that opens to the bottom, a second liquid passage hole 13 that opens to the concave portion 11b and the bottom side of the cylinder hole 4 on the disk delivery side of the other action portion 3a, and the first liquid passage. The hole 12 and the second liquid passage hole 13 are connected to each other, and a communication passage 14 in the disk axial direction having one end opened on the outer surface of the one action portion 3a.

  Further, the first liquid passage holes 12, 12 formed in both bridge portions 3 b, 3 b, the second liquid passage holes 13, 13, and the communication passages 14, 14 are in a disc axis and a plan view. The first liquid passage hole 12 and the second liquid passage hole 13 of each of the bridge portions 3b and 3b are disc rotors, which are formed symmetrically with respect to the first reference plane B1 passing through the caliper body center portion C1. Are formed in plane symmetry with respect to the second reference plane B2 which is parallel to the two side faces and passes through the caliper body center C1. The first reference plane B1 and the second reference plane B2 are orthogonal to each other at the caliper body center C1.

  Breeder holes 15 and 15 are formed in the openings of the communication passages 14 and 14, and bleeder screws 16 and 16 are screwed into the bleeder holes 15 and 15, respectively. In addition, a union bolt of a brake hose is screwed into the union hole 10 that opens to the one action portion 3a.

  The openings 12a and 13a of the first liquid passage hole 12 and the second liquid passage hole 13 formed in the recesses 11a and 11b are connected to the opening side and the first liquid passage hole 12 or the second liquid passage hole 13, respectively. Large diameter holes 12c and 13c are formed on the opening side and small diameter holes 12d and 13d are formed on the crossing side through stepped parts 12b and 13b formed between the crossing part C2 intersecting with 14 and sealed. Each is sealed with a stopper 17.

  The sealing plug 17 includes a sealing portion 17 a that closes the openings 12 a and 13 a of the first liquid passage hole 12 and the second liquid passage hole 13, and the first liquid passage hole 12 continuously to the sealing portion 17 a. Or the shaft part 17b which obstruct | occludes to the cross | intersection part C2 where the 2nd liquid passage hole 13 and the communicating path 14 cross | intersect is provided. The sealing portion 17a has an outer diameter corresponding to the inner diameter of the large-diameter holes 12c and 13c, the opening side of the second liquid passage hole 13 and the communication passage 14 is opened, and the outer periphery of the bottom surface is in contact with the step portions 12b and 13b. It has a bottomed cylindrical portion 17c and a sphere 17d, and the shaft portion 17b protrudes from the center of the bottom of the sealing portion 17a and has an outer diameter corresponding to the inner diameter of the small diameter holes 12d and 13d. . The bottomed cylindrical portion 17c has a large-diameter portion 17f formed on the inner peripheral surface of the opening end via a step portion 17e, and the expanded-diameter member holding portion configured by the large-diameter portion 17f and the step portion 17e A spherical body 17d is held. The diameter of the spherical body 17d can be held by the large-diameter portion 17f, and is larger than the diameter of the small-diameter portion 17g on the bottom side of the stepped portion 17e of the bottomed cylindrical portion 17c.

  The sealing plug 17 formed in this way has the shaft portion 17 b in the small diameter holes 12 d and 13 d of the first liquid passage hole 12 or the second liquid passage hole 13, and the first liquid passage hole 12 or the second liquid passage hole 13. The bottomed cylindrical portion 17c is fitted into the large diameter holes 12c and 13c, respectively, and the bottom surface of the bottomed cylindrical portion 17c is brought into contact with the first liquid passage hole 12 or the step portions 12b and 13b of the second liquid passage hole 13. By pushing the spherical body 17d held on the opening side of the bottomed cylindrical portion 17c into the bottom side of the bottomed cylindrical portion 17c, the spherical body 17d gets over the stepped portion 17e and enters the small diameter portion 17g. The 17g peripheral wall is expanded and expanded. As a result, the bottomed cylindrical portion 17 c is brought into close contact with the large-diameter holes 12 c and 13 c of the first liquid passage hole 12 and the second liquid passage hole 13, and the first liquid passage hole 12 and the second liquid passage hole 13 are opened. The portions 12 a and 13 a are sealed, and the shaft portion 17 b closes the first liquid passage hole 12 and the intersection C <b> 2 between the second liquid passage hole 13 and the communication path 14. Further, by sealing the openings 12a and 13a of the first fluid passage hole 12 and the second fluid passage hole 13 with the sealing plugs 17 in this way, the four fluid pressure chambers 7 and the fluid pressure chamber side communication are provided. The hydraulic path 18 including the part 10, the first liquid passage hole 12, and the second liquid passage hole 13 and including the union hole 11 and the bleeder hole 15 is formed in the caliper body 3.

  In this embodiment, as described above, the hydraulic chambers 7, 7 facing both sides of the disk rotor 2 are provided with the first liquid passage hole 12, the second liquid passage hole 13, and the communication passage 14 provided in the caliper body 3. The caliper body 3 is not increased in size. In addition, the first liquid passage holes 12, 12 and the second liquid passage holes 13, 13 and the communication passages 14, 14 are connected to the first reference plane B1 passing through the disk shaft and the caliper body center C1. Each of the first liquid passage hole 12 and the second liquid passage hole 13 is parallel to the side surface of the disc rotor 2 and passes through the caliper body center portion C1. The caliper body is formed symmetrically and has a pair of bleeder holes 15 and 15 formed on both sides in the disk rotation direction of the one action part 3a by opening each communication passage 14 on the outer surface of one action part 3a. Any one of the three upper positions of the vehicle body may be selected as the bleeder hole 15 according to the mounting position of the vehicle body 3, and good air bleedability can be ensured regardless of the mounting position of the vehicle body. As a result, one type of caliper body 3 can be attached to either the left or right side of the vehicle body, and the cost can be reduced. Furthermore, since the bleeder hole 15 can be used to bleed the hydraulic circuit satisfactorily with a single bleed operation, workability can be improved.

  For example, in this embodiment, the caliper body 3 attached to the right side of the vehicle body is arranged in the direction shown in FIG. 2 and one bleeder screw 16 located above the vehicle body is loosened to release air from the hydraulic circuit from the bleeder hole 15. The caliper body 3 attached to the left side of the vehicle body is attached to the vehicle body by reversing the attachment state shown in FIG. 2 in the vertical direction, and the other bleeder screw 16 located above the vehicle body is loosened from the bleeder hole 15 to the hydraulic circuit. Remove air.

  Further, the first liquid passage hole 12 and the second liquid passage hole 13 are provided by the shaft portion 17 b provided in the sealing plug 17 that seals the openings 12 a and 13 a of the first liquid passage hole 12 and the second liquid passage hole 13. Since the portion that is not used as the oil passage is filled, the portion where air is accumulated can be reduced as much as possible, and the air venting performance of the hydraulic circuit can be improved.

  The present invention is not limited to the case where both communication paths are opened to one action part as in the above-described embodiment, but one communication path is set to one action part and the other communication path is set to the other action. It can also be opened in the part. Furthermore, a bleeder hole of the communication path may be formed on one side, and a union hole may be formed on the other communication path. Further, in the above-described embodiment, a concave portion is formed on the disk rotor outer peripheral side ceiling surface of the bridge portion, and the first liquid passage hole and the second liquid passage hole are opened in the concave portion, but the concave portion is not provided. The first liquid passage hole and the second liquid passage hole may be opened on the disk rotor outer peripheral side ceiling surface of the bridge portion. Furthermore, it is not limited to a radial mount type caliper body provided with a mounting bolt insertion hole in the disk radial direction as a vehicle body mounting portion, but a vehicle body mounting arm that protrudes on the disk entry side and the delivery side of one working portion. And a mounting bolt insertion hole formed in the vehicle mounting arm, a vehicle body mounting portion may be formed, and the caliper body may be mounted to the vehicle body by a mounting bolt in the disk axial direction inserted through the mounting bolt insertion hole. Further, the caliper body is not limited to a 4-pot piston facing type, and may be a 2-pot or a 6-pot or more piston facing type. Further, as the sealing plug, only a sealing portion without a shaft portion or a plug can be used.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... Action part, 3b ... Bridge part, 3c ... Torque receiving part, 3d ... Mounting bolt insertion hole, 4 ... Cylinder hole, 5 ... Piston, 6 ... Piston seal, 7 ... Hydraulic chamber, 7a ... Hydraulic chamber communicating portion, 8 ... Friction pad, 8a ... Lined, 8b ... Back plate, 9 ... Hanger pin, 9a ... Leg, 10 ... Union hole, 11a, 11b ... concave portion, 12 ... first liquid passage hole, 13 ... second liquid passage hole, 12a, 13a ... opening, 14 ... communication passage, 15 ... bleeder hole, 16 ... bleeder screw, 17 ... sealing plug, 17a ... Sealing part, 17b ... shaft part, 17c ... bottomed cylindrical part, 17d ... spherical body, 17e ... step part, 17f ... large diameter part, 17g ... small diameter part

Claims (3)

A monocoque piston facing the monocoque structure, which is integrally formed with a pair of working parts arranged on both sides of the disk rotor and provided with cylinder holes, and a pair of bridge parts provided on the disk introduction side and the disk delivery side when the vehicle moves forward In the caliper body of the type of vehicle disc brake, each of the bridge portions includes a first liquid passage hole that opens to a disk rotor outer peripheral side ceiling surface and a bottom side of the cylinder hole of one action portion, and the disc rotor. The second liquid passage hole that opens to the outer peripheral side ceiling surface and the bottom side of the cylinder hole of the other action portion, the first liquid passage hole and the second liquid passage hole are communicated with each other, Each of the communication passages disposed in the upper part of the vehicle body with the caliper body attached to the vehicle body. In addition, bleeder holes for discharging the air in the working fluid are formed, and the openings of the first liquid passage holes and the second liquid passage holes formed on the outer surfaces of the bridge portions are respectively sealed with sealing means. A caliper body of a disc brake for a vehicle characterized by being stopped. A union hole that opens both the communication passages to one working portion, forms a bleeder hole in each opening of the both communication passages, and supplies hydraulic fluid to the bottom portion of the cylinder hole to the one working portion And a pair of vehicle body attachment portions, the bleeder hole, the vehicle body attachment portion, the first liquid passage holes formed in both the bridge portions, the second liquid passage holes, The communication paths are formed symmetrically with respect to a first reference plane that passes through the disc shaft and the caliper body center portion in plan view of the caliper body, and the union hole is formed on the first reference plane. The first liquid passage hole and the second liquid passage hole of each bridge portion are in plane symmetry with respect to a second reference plane that is parallel to the side surface of the disc rotor and passes through the central portion of the caliper body. A contract characterized by being formed Claim 1 for a vehicle disc caliper body of the brake according. The sealing means includes a sealing portion that seals an opening side of each first liquid passage hole and each second liquid passage hole formed on the outer surface of each bridge portion, and the sealing portion. A shaft portion that is inserted into the first liquid passage hole or the second liquid passage hole and has a length that reaches an intersecting portion where the first liquid passage hole or the second liquid passage hole intersects the communication path. The caliper body of the disk brake for vehicles according to claim 1 or 2, wherein the caliper body is a sealing plug provided with

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