JP3863870B2 - Split caliper body for vehicle disc brakes - Google Patents

Description

  The present invention relates to a vehicle disc brake used for a traveling vehicle such as an automobile or a motorcycle, and more particularly, to a caliper body used for a disc brake, which is a split type, and a coupling structure of split pieces constituting the caliper body. .

As a vehicle disc brake using a split-type caliper body, the caliper body is divided from the center portion of the bridge portion into a pair of split pieces, which are divided into a disc inlet side, a disc outlet side and an intermediate portion of both split pieces. There is known a structure in which connecting bolts are inserted through three divided joint surfaces in the disk axial direction, and both divided pieces are integrally connected as a caliper body (see, for example, Patent Document 1).

  Four cylinder holes are provided opposite to each other on the working parts of the two divided pieces disposed on both sides of the disk rotor, and a piston is inserted into each of the cylinder holes in a fluid-tight and movable manner, A hydraulic chamber is defined between each piston and the bottom wall of the cylinder hole. Two ceiling openings are arranged in the center of the bridge portion in the circumferential direction of the disk, and the joint surfaces of both divided pieces are the disk entry side, the disk delivery side, and the intermediate part across the ceiling opening. It is divided into three.

A liquid passage is provided on one of the joint surfaces of the disk inlet side and the disk outlet side so as to communicate with a pair of hydraulic chambers facing each other with the disk rotor interposed therebetween. Another fluid passage is provided in communication with another pair of fluid pressure chambers facing each other with the disc rotor in between, and the two pistons are operated by two brake actuators for each of the four pistons. The body.
Japanese Patent Publication No.47-5164

  However, the above-described joining surfaces on the disk entry side and the disk delivery side are formed with the same area at the same distance from the joining surface of the intermediate portion, and either one of the disk entry side and the disk delivery side is formed. Since two joint bolts and two liquid passages are provided on the two joint surfaces of the joint surface and the intermediate portion, the pitch between the bolts of one joint surface and the joint surface of the intermediate portion is different from that of the other joint surface. It becomes longer than the pitch between bolts with the joining surface of the intermediate portion, and the connection strength acting on one joining surface by the tightening torque of the connecting bolt is reduced.

  For this reason, when the braking reaction force in the anti-disk direction from the piston during braking acts on both action parts of the caliper body, the caliper body tries to open and deform in a C shape with the bridge part as a fulcrum, One joint surface side may be greatly bent from the intermediate portion of the bridge portion where the rigidity is reduced, and the hydraulic chamber on one joint surface side may be larger than the other joint surface side, resulting in a hydraulic pressure loss.

  Also, because of the expansion of the hydraulic chamber described above, when the piston on one joint surface side returns to the bottom of the cylinder hole by releasing the braking operation, a so-called knock is pushed into the inner part of the cylinder hole by a predetermined amount or more. Backing occurs, the piston stroke is extended, and the initial braking is slightly delayed. Further, one brake operator has a large play stroke and a fluffy operation feeling without rigidity.

  Therefore, the present invention is for a vehicle that can solve the above-mentioned problems by ensuring a sufficient rigidity on one joint surface side where the pitch between bolts is long and the connection strength due to the tightening torque of the connection bolt is reduced. It aims to provide a split caliper body for disc brakes.

According to the above-described object, the first aspect of the present invention will be described with reference to the drawings. The caliper body (3) is separated from the bridge portion (3e) straddling the outside of the disk rotor (2) by a pair of split pieces (3a, 3b) , each of the three pieces (3f, 3g, 3h) divided into the disk inlet side, the disk outlet side, and the intermediate part of both divided pieces (3a, 3b) . A split type in which the connecting bolts (6a, 6c, 6b) are inserted in the disk axial direction and the pair of split pieces (3a, 3b) are connected together, facing both sides of the disk rotor (2). Two cylinder holes (7) are respectively provided on the disk delivery side and the disk delivery side of the action portions (3c, 3d) of both divided pieces (3a, 3b) to be disposed, (7) Ekimitsu且the piston (8) to the respective By interpolation movably, respectively hydraulic pressure chamber between the bottom wall of each piston (8) and the cylinder bore (7) (9a, 9b, 10a, 10b) defines an opposing disk rotation exit side A fluid passage (12a) communicating the two fluid pressure chambers (10a, 10b) is provided in the joint surface (3g) on the disk delivery side, and the two fluid pressure chambers (9a, 9b) on the opposite side of the disk delivery side. A split caliper body for a vehicle disc brake in which a liquid passage (11a) communicating with the intermediate portion is provided in the joint surface (3h) of the intermediate portion , the three connecting bolts (6a, 6c, 6b) and the 2 The two liquid passages (11a, 12a) are on the outer peripheral side of the disk rotor (2), and the connecting bolt (6c) between the connecting bolt (6c) and the liquid passage (11a) on the joint surface (3h) of the intermediate portion. On the disk inlet side and the liquid passage (11a) The connecting bolt (6b) of the connecting surface (3g) on the disk outlet side and the liquid passage (12a) are connected to the disk outlet side, the connecting bolt (6b) is connected to the disk inlet side, and the liquid passage (12a) is provided. the outlet side disk rotation, each arranged side by side, as well as larger than the area of the junction surface of the disk rotation exit side area of the joint surface of the disk rotation entrance side of (3g) (3f), said disk The pitch between bolts (P1) between the joining surface (3g) on the delivery side and the joining surface of the intermediate portion (3h) is the bolt between the joining surface (3f) on the disk entry side and the joining surface of the intermediate portion (3h). It is characterized by being set longer than the interval pitch (P2) . Further, according to a second aspect of the present invention, the caliper body (3) is divided into a pair of divided pieces (3a, 3b) from a bridge portion (3e) straddling the outside of the disc rotor (2) , and both divided pieces (3a, 3b) are separated . 3b) , one connecting bolt (6a, 6c, 6b) is connected to the disk shaft on each of the three joint surfaces (3f, 3g, 3h) divided into the disk inlet side, the disk outlet side and the intermediate part. A split type that is inserted in the direction and integrally connects the pair of split pieces (3a, 3b) , both split pieces (3a, 3b) disposed opposite to both sides of the disk rotor (2 ) Two cylinder holes (7) are provided oppositely on the disk delivery side and the disk delivery side of the action portions (3c, 3d) of the cylinder, and a piston (8) is provided in each of the cylinder holes (7). dense and by interpolation movably, Siri and each piston (8) Defining respective fluid pressure chambers (9a, 9b, 10a, 10b) and between the bottom wall of da hole (7), communicating two liquid chambers of the disk rotation entrance side (9a, 9b) opposed A liquid passage is provided in the joint surface (3f) on the disk inlet side, and another liquid passage communicating with the two fluid pressure chambers (10a, 10b) on the opposite disk outlet side is joined to the intermediate portion. A split caliper body for a vehicle disc brake provided on a surface (3h) , wherein the three connecting bolts (6a, 6c, 6b) and the two liquid passages (11a, 12a) are connected to the disc rotor (2 ) And the connecting bolt (6c) and the liquid passage on the joint surface (3h) of the intermediate portion, the liquid passage is on the disk inlet side, and the connecting bolt (6c) is on the disk outlet side. The connecting bolt (6a) on the joint surface (3f) on the disk entry side and The liquid passage is a passage in the disk rotation entrance side, connecting bolt (6a) to the outlet side disk rotation, each arranged side by side, the area of the bonding surface of the disk rotation inlet and outlet (3f) wherein the disk times while larger than the area of the joint surface of the outlet side (3 g), the joint surface of the disk rotation entrance side (3f) and the intermediate portion of the bolt pitch between the bonding surface of the (3h), the junction of the disk rotation exit side It is characterized in that it is set longer than the pitch between bolts between the surface (3g) and the joint surface of the intermediate portion (3h) .

  According to the present invention, of the joining surfaces on the disk entry side or the disk delivery side of the bridge portion, the joining surface having the longer pitch between the bolts from the intermediate portion projects in a wider area than the shorter joining surface. Thus, the rigidity against the braking reaction force is increased, and the U-shaped deformation can be suppressed as much as the other joint surface side. As a result, there is almost no hydraulic loss due to expansion of the hydraulic pressure chamber on the joint surface side where the pitch between the bolts is long, and the hydraulic fluid supplied to the fluid pressure chamber is made effective as in the case of the shorter joint surface side. This makes it possible to perform highly efficient braking, effectively prevent piston knockback and initial braking delay due to increased piston stroke, and eliminate the extra play stroke in the brake operator. It is possible to have a good operation feeling with a sense of rigidity.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The disc brake 1 includes a disc rotor 2 that rotates in the direction of arrow A, a caliper body 3 that is attached to the vehicle body at one side of the disc rotor 2, and a caliper body 3 that faces the disc rotor 2 with the disc rotor 2 interposed therebetween. The four friction pads 4, 4, 5, and 5 are formed in the caliper body 3. The two fluid pressure chambers 9 a and 9 b on the disk feed-in side and the two fluid pressure chambers 10 a on the disk feed-out side in the caliper body 3. , 10b are two systems that are hydraulically operated by separate brake operators (not shown).

  The caliper body 3 is divided into a pair of divided pieces 3a and 3b by cutting the central portion of the bridge portion 3e in the circumferential direction of the disk, and the divided parts 3a and 3b have a disk feeding side, a disk feeding side, and an intermediate part. A split caliper body in which three connecting bolts 6a, 6b, 6c are inserted in the disk axial direction into the three joint surfaces 3f, 3g, 3h, and both split pieces 3a, 3b are connected integrally. Car body mounting brackets 3i and 3j integrally formed with one of the divided pieces 3a are fixed to a vehicle body (not shown) with bolts.

  Each of the divided pieces 3a and 3b includes half of the bridge portion 3e and action portions 3c and 3d disposed on both sides of the disc rotor 2, and faces both action portions 3c and 3d with the disc rotor 2 interposed therebetween. The pistons 8 are respectively inserted into the four cylinder holes 7 having the same diameter. Hydraulic chambers 9 a, 9 b, 10 a, 10 b are defined between the piston 8 and the bottom wall of the cylinder hole 7, and the two hydraulic chambers 9 a, 9 b on the disk inlet side with the disk rotor 2 interposed therebetween. Are communicated through the liquid passages 11a and 11a, and the two fluid pressure chambers 10a and 10b on the disk delivery side are communicated through the liquid passages 12a and 12a.

  Each cylinder hole 7 is provided with a square seal 13 and a dust seal 14 that are fitted to the piston 8 with an interference fit. The square seal 14 holds the piston 8 so as to be movable in the cylinder axial direction. Further, the insides of the hydraulic chambers 9a, 9b, 10a, 10b are sealed in a liquid-tight manner, and dust and water are prevented from entering the cylinder hole 7 by the dust seal 13.

  Each piston 8 is arranged with its tip slightly protruding from the opening of the cylinder hole 7, and the friction pads 4, 4, 5, 5 are provided on the front surface of the four pistons 8, one by one. ing. The friction pads 4 and 5 are each composed of a lining 15 and a metal back plate 16, and the upper portions of the back plates 16 and 16 facing each other with the disc rotor 2 interposed therebetween, with each lining 15 facing the disc rotor 2 side. A hanger pin 17 is inserted through the hanger pin 17 and suspended so as to be movable in the disk axial direction. The pad spring 18 is provided between the back plate 16 and the hanger pin 17 so as to be urged inward in the disk. Yes.

  At the center of the bridge portion 3e divided into the divided pieces 3a, 3b, two ceiling openings 19, 19 are sized so that the friction pads 4, 4, 5, 5 can be inserted into and removed from the front surface of the piston 8. The joint surfaces 3f, 3g, and 3g are arranged at three locations on the disk insertion side, the extraction side, and the intermediate portion sandwiching the ceiling openings 19, 19, by forming both ceiling openings 19, 19 in parallel. 3h is divided.

  In addition to the brackets 3i and 3j and the liquid passages 11a and 12a, the one divided piece 3a on the vehicle body mounting side has union holes 20a and 20b for introducing hydraulic fluid, and bolt holes 21a and 21b for connecting the divided pieces. , 21c. In addition to the liquid passages 11b and 12b, the other divided piece 3b includes bleeder holes 22a and 22b for discharging mixed air in the working fluid, and bolt holes 21a, 21b and 21c for connecting the divided pieces. Is provided. The bleeder holes 22a and 22b are opened on the upper surfaces of the bleeder boss portions 3k and 3m projecting from the joint portions 3h and 3g on the intermediate portion and the disk delivery side, and a bleeder screw 23 is screwed to each of these openings. Yes.

  The union hole 20a on the disk entry side of the divided piece 3a opens in the intermediate joint surface 3h together with the liquid passage 11a communicating with the hydraulic chamber 9a on the disk entry side, and the union hole 20b on the disk delivery side A fluid passage 12a that communicates with the fluid delivery chamber 10a on the disk delivery side and an opening on the joint surface 3g on the disk delivery side, and three joint surfaces 3f on the disk delivery side, the delivery side, and the intermediate portion, Bolt holes 21a, 21b, and 21c are formed in 3g and 3h by female screw holes.

  Further, in the divided piece 3b, a liquid passage 11a communicating with the hydraulic pressure chamber 9b on the disk feed-in side opens in the intermediate joint surface 3h together with one bleeder hole 22a, and communicates with the hydraulic pressure chamber 10b on the disk feed-out side. The liquid passage 12a is opened to the joint surface 3g on the disk delivery side together with the other bleeder hole 22b, and further connected to the joint surfaces 3f, 3g, and 3h on the disk delivery side, the delivery side, and the intermediate portion. Bolt holes 21a, 21b, and 21c having a diameter larger than that of the bolts 6a to 6c are formed.

  In the joining surface 3g on the disk delivery side and the joining surface 3h on the intermediate part of each divided piece 3a, 3b, the liquid is placed in the bolt hole 21a with respect to the joining surface 3f on the disk entry side in which only the bolt hole 21a is formed. Since the passage 12a or the liquid passage 11a is arranged side by side, the distance between the centers of the bolt hole 21b on the disk delivery side and the bolt hole 21c on the intermediate part, that is, the connecting bolts 6b, 6c on the disk delivery side and the intermediate part. The pitch P1 is inevitably longer than the center-to-center distance between the disk insertion side bolt hole 21a and the intermediate bolt hole 21c, that is, the pitch P2 between the disk insertion side and the intermediate connection bolts 6a and 6c. .

  For this reason, on the disk delivery side of the bridge portion 3e, the connection strength due to the tightening torque of the connection bolts 6b and 6c on the disk delivery side and the intermediate part is lower than that on the disk delivery side. The joint surfaces 3g, 3g on both sides of the disk 3a, 3b are formed in an area approximately twice as large as the joint surface 3f on the disk entry side, and the joint surface 3f on the disk entry side is formed on the disk delivery side. By abutting both joint surfaces 3g, 3g having a larger area, a high rigidity force against a braking reaction force is ensured on the disk delivery side of the bridge portion 3e.

  Next, the operation of this embodiment configured as described above will be described. The two union holes 20a and 20b are supplied with hydraulic fluid that has been pressurized by a hydraulic master cylinder for each brake system by a driver's braking operation. The hydraulic fluid introduced into the union hole 20a on the disk entry side branches the liquid passages 11a and 11a and enters the hydraulic chambers 9a and 9b, and pushes the pistons 8 and 8 toward the opening of the cylinder hole 7. Thus, the lining 15 of the front friction pad 4 is pressed against the side surface of the disk rotor 2. The hydraulic fluid introduced into the union hole 20b on the disk delivery side branches the liquid passages 12a and 12a and enters the hydraulic chambers 10a and 10b, and pushes the pistons 8 and 8 toward the opening of the cylinder hole 7. The lining 15 of the front friction pad 5 is pressed against the side surface of the disk rotor 2.

  A braking reaction force in the anti-disk direction acts from the pistons 8 and 8 on the action portions 3c and 3d at the time of braking, respectively, and the caliper body 3 tries to open and deform in a C shape with the bridge portion 3e as a fulcrum. On the disk entry side from the intermediate part of the bridge portion 3e, the disk connection side with a short bolt pitch P2 and the large connection strength due to the tightening torque of the connection bolts 6a and 6c at the intermediate part act to suppress the C-shaped deformation as much as possible. To do. Further, on the disk delivery side from the intermediate part of the bridge portion 3e having a long pitch P1 between the bolts, the joining surfaces 3g and 3g on the disk delivery side larger than the joining surface 3f on the disk delivery side are abutted in a wide area. As a result, the rigidity against the braking reaction force is increased, and the U-shaped deformation can be suppressed as much as possible in the same manner as the disk insertion side.

  As a result, in the brake system on the disk delivery side, as with the brake system on the disk delivery side, there is almost no fluid pressure loss due to the expansion of the fluid pressure chambers 9a and 9b, and the fluid is supplied to both fluid pressure chambers 9a and 9b. The hydraulic fluid can be effectively utilized to perform highly efficient braking, and the knockback of the piston 8 and the delay of the initial braking due to the increase of the piston stroke can be effectively prevented. The brake operator of this brake system can have a good operation feeling with rigidity as in the brake system on the disk entry side.

  In the above embodiment, the caliper body for two systems has been described. However, the present invention is not limited to the number of systems, and at least one of the joining surfaces on the disk entry side and the disk delivery side is provided. The present invention can be applied to any caliper body having a liquid passage and having different pitches between bolts on the three joint surfaces of the disk inlet side, the disk outlet side, and the intermediate portion.

FIG. 2 is a cross-sectional view taken along the line II in FIG. 1 is a partially cutaway plan view of a disc brake showing an embodiment of the present invention. The front view of the disc brake which shows one example of this invention IV-IV sectional view of FIG. 3 showing an example of the present invention VV sectional view of FIG.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Hydraulic type disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a, 3b ... Divided piece, 3c, 3d ... Action part, 3e ... Bridge part, 3f ... Joining surface on the disk entrance side, 3g ... Disc Bonding surface on the delivery side, 3h ... joining surface in the middle part, 4,5 ... friction pad, 6a, 6b, 6c ... connecting bolt, 9a, 9b, 10a, 10b ... hydraulic chamber, 11a, 12a ... liquid passage, DESCRIPTION OF SYMBOLS 15 ... Lining of the friction pads 4 and 5 16 ... Back plate of the friction pads 4 and 5 19 ... Ceiling opening part, 21a, 21b, 21c ... Bolt hole, A ... Rotation direction of the disc rotor 2, P1 ... Disc rotation Pitch of connecting bolts 6b and 6c on the side and the intermediate part, P2... Pitch of connecting bolts 6a and 6c on the disk feed-in side and the intermediate part

Claims (2)

The caliper body (3) is divided into a pair of divided pieces (3a, 3b) from the bridge portion (3e) straddling the outside of the disk rotor (2) , and the disk entry side and the disk of both divided pieces (3a, 3b) One connecting bolt (6a, 6c, 6b) is inserted through the three joint surfaces (3f, 3g, 3h) divided into the delivery side and the intermediate portion in the disk axial direction, and the pair of pairs split pieces (3a, 3b) of a split type connecting together, the working portion of both split pieces disposed to face both sides of the disc rotor (2) (3a, 3b) of (3c, 3d) Two cylinder holes (7) are provided opposite to each other on the disk delivery side and the disk delivery side, and a piston (8) is inserted into each of the cylinder holes (7) in a liquid-tight and movable manner, each piston (8) and the bottom wall of the cylinder bore (7) Each hydraulic chamber in (9a, 9b, 10a, 10b ) fraction forms the opposing disk rotation exit side of the two hydraulic chambers (10a, 10b) and the delivery side of the fluid passage communicating (12a) the disk rotation The vehicle disc is provided with a fluid passage (11a) provided on the joining surface (3g) of the intermediate portion and a fluid passage (11a) communicating the two fluid pressure chambers (9a, 9b) on the opposite side of the disc feeding side. A split caliper body for a brake, wherein the three connecting bolts (6a, 6c, 6b) and the two liquid passages (11a, 12a) are on the outer peripheral side of the disk rotor (2) and the intermediate portion The connecting bolt (6c) on the joint surface (3h) and the liquid passage (11a) have the connecting bolt (6c) on the disk inlet side, the liquid passage (11a) on the disk outlet side, and the disk outlet side. Connecting bolt (6 g) ) Said fluid passage (12a) and at the connection bolt (6b) into the disk rotation entrance side and a fluid passage (12a) on the outlet side disk rotation, each arranged side by side, the bonding surface of side exit the disk rotation area bonding surfaces of the disk rotation entrance side of (3 g) as well as larger than the area of the (3f), between the bolt and the joint surface of the disk rotation exit side (3 g) and the bonding surface of the intermediate portion (3h) The split type of a vehicle disc brake characterized in that the pitch (P1) is set longer than the pitch (P2) between bolts of the joining surface (3f ) on the disk entry side and the joining surface of the intermediate portion (3h). Caliper body. The caliper body (3) is divided into a pair of divided pieces (3a, 3b) from the bridge portion (3e) straddling the outside of the disk rotor (2) , and the disk entry side and the disk of both divided pieces (3a, 3b) One connecting bolt (6a, 6c, 6b) is inserted through the three joint surfaces (3f, 3g, 3h) divided into the delivery side and the intermediate portion in the disk axial direction, and the pair of pairs split pieces (3a, 3b) of a split type connecting together, the working portion of both split pieces disposed to face both sides of the disc rotor (2) (3a, 3b) of (3c, 3d) Two cylinder holes (7) are provided opposite to each other on the disk delivery side and the disk delivery side, and a piston (8) is inserted into each of the cylinder holes (7) in a liquid-tight and movable manner, each piston (8) and the bottom wall of the cylinder bore (7) Defining respective fluid pressure chambers (9a, 9b, 10a, 10b ) to the bonding surfaces of the two hydraulic chambers (9a, 9b) wherein a fluid passage which communicates disc times the inlet side of the opposing disk rotation to the entry side (3f) and a disc brake for a vehicle in which another fluid passage communicating with the two fluid pressure chambers (10a, 10b) on the disk delivery side facing each other is provided on the joint surface (3h) of the intermediate portion. Divided caliper bodies, wherein the three connecting bolts (6a, 6c, 6b) and the two liquid passages (11a, 12a) are arranged on the outer peripheral side of the disk rotor (2) and at the intermediate portion. Of the connecting bolt (6c) and the liquid passage on the joining surface (3h), the liquid passage is on the disk entry side, the connection bolt (6c) is on the disk delivery side, and the joining surface (3f) on the disk entry side is The liquid passage between the connecting bolt (6a) and the liquid passage The disk rotation entrance side, connecting bolt (6a) to the outlet side disk rotation, each arranged side by side, the bonding surface area of the disk rotation exit side of the bonding surface of the disk rotation inlet and outlet (3f) (3 g while larger than the area of) the bonding surface of the disk rotation entrance side (3f) and the intermediate portion of the bolt pitch between the bonding surface of the (3h), the bonding surface of the disk rotation exit side (3 g) and intermediate portion A split caliper body for a disk brake for a vehicle, wherein the split brake caliper body is set to be longer than a pitch between bolts to a joint surface of (3h) .

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