JP2007024290A - Opposed piston type disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve an inexpensive and lightweight structure for improving rigidity of a caliper 5b and preventing the unprepared fall of pads 10a, 11a from the caliper 5b. <P>SOLUTION: Wall parts 24, 24 are provided at the circumferential center part of an opening 22 provided radially outside between both outer and inner body parts 3b, 4b, and both end side parts of a pad pin 23 are supported to these respective wall parts 24, 24 to extend the pad pin 23 between both body parts 3b, 4b. The respective pads 10a, 11a are supported to intermediate parts of the pad pin 23 in a freely displaceable manner in the axial direction of a rotor. Both ends of an intermediate rib 34 are connected to the radial outside of the rotor rather than the inserted portions of both end side parts of the pad pin 23 in the respective wall parts 24, 24. The intermediate rib 34 is extended between both body parts 3b, 4b in a state of covering the radial outside of the rotor, at the intermediate part of the pad pin 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement of an opposed piston type disc brake in which pistons are provided on both sides of a rotor in a state of facing each other among disc brakes used for braking an automobile.

  Disc brakes are widely used to brake automobiles. At the time of braking by the disc brake, a pair of pads arranged on both sides in the axial direction of the rotor rotating together with the wheels are pressed against both side surfaces of the rotor by the piston. Conventionally, various types of disc brakes have been known. However, the opposed piston type disc brake, which is provided with pistons on both sides of the rotor so as to face each other, can obtain a stable braking force. In recent years, use cases have increased. FIG. 12 shows a first example of a conventional structure of an opposed piston type disc brake described in Patent Document 1, for example. This opposed piston type disc brake 1 is provided with calipers 5 composed of an outer body portion 3 and an inner body portion 4 at both side positions sandwiching a rotor 2, and an outer cylinder and an inner cylinder are respectively provided in the body portions 3 and 4, respectively. The openings are provided in a state of being opposed to each other via the rotor 2. The outer piston and the inner piston are fitted in the outer cylinder and the inner cylinder so as to be liquid-tight and displaceable in the axial direction of the rotor 2. Further, an outer pad is supported on the outer body 3 and an inner pad is supported on the inner body 4 so as to be displaceable in the axial direction of the rotor 2.

  During braking, pressure oil is fed into the outer cylinder and the inner cylinder, and the outer pad and the inner pad are pressed against both the inner and outer side surfaces of the rotor 2 by the outer piston and the inner piston. In the case of the structure described in Patent Document 1 shown in FIG. 12, the outer body part 3 and the inner body part 4 formed separately from each other are connected by a plurality of connecting bolts, and the caliper 5 is connected. It is said.

  13 to 14 show a second example of the conventional structure of the opposed piston type disc brake described in Patent Document 2. FIG. Also in the case of this opposed piston type disc brake 1a, the outer and inner body portions 3a and 4a are coupled by a plurality of coupling bolts 6 and 7 in the same manner as the disc brake 1 shown in FIG. The caliper 5a is used. Further, between the body portions 3a and 4a, the central portion of the opening 8 provided on the outer side in the radial direction of the rotor 2 (upper side in FIGS. 13 and 14) in the circumferential direction (left and right direction in FIG. 13) In addition, the pad pin 9 is provided in a state of being spanned between the body parts 3a and 4a.

  Then, the intermediate portion of the pad pin 9 is slidable in the axial direction in each through hole 13 provided in the central portion in the circumferential direction of the rotor 2 of the pressure plates 12 and 12 constituting the outer pad 10 and the inner pad 11, respectively. Is inserted. Further, the side surfaces of the first and second protrusions 14 and 15 provided at both circumferential ends of the pressure plates 12 and 12 are connected to the lower surface of the intermediate portion of the coupling pins 6 and 6 and the opening 8. Are opposed to both side edges in the circumferential direction. At the time of braking, pressure oil is sent to outer cylinders and inner cylinders (not shown) provided on the body parts 3a and 4a, and the outer and inner pistons are fitted by the outer and inner pistons (not shown) fitted to the cylinders. The pads 10 and 11 are pressed against both side surfaces of the rotor 2.

  Although not shown, in Patent Documents 3 and 4, similarly to the structures described in Patent Documents 1 and 2, both the outer and inner body parts are combined with a plurality of connecting bolts to form calipers. An opposed piston type disc brake is described. On the other hand, as described in Patent Documents 5 and 6, an opposed piston type disc brake having a caliper in which an outer body portion and an inner body portion are integrated (integrated molding) is also conventionally known. ing. In the case of the structures described in Patent Documents 5 and 6, unlike the structure shown in FIGS. 12 to 14 described above, the labor for coupling and fixing the outer and inner body parts is not required. The assembly workability of the opposed piston type disc brake is advantageous.

  However, as shown in FIGS. 12 to 14, the outer and inner body parts 3, 3a, 4, 4a are connected by a plurality of connecting bolts 6, 7 to form calipers 5, 5a. In the case of the structure including the caliper, the caliper 5 described in Patent Documents 5 and 6 is provided with a so-called integrated caliper in which the outer and inner body portions are integrated. There is still room for improvement in terms of improving the rigidity of 5a. For example, in the case of the structure described in Patent Document 2 shown in FIGS. 13 to 14 described above, reaction force is applied to the outer body portion 3a and the inner body portion 4a in a state where the outer and inner pistons are pressed against the rotor 2 during braking. The two body portions 3a and 4a are deformed in the direction in which the distance between them increases, and the amount of brake fluid fed into each of the outer and inner cylinders needs to be increased correspondingly. Getting worse.

  In order to prevent the deterioration of the brake pedal operation feeling due to such a cause, conventionally, an opening provided on the outer side in the radial direction of the rotor between the outer and inner body parts in order to improve the rigidity of the caliper. It is considered that an intermediate reinforcing portion called a center bridge is provided in the central portion in the circumferential direction of the rotor, and the outer and inner body portions are coupled to each other by the intermediate reinforcing portion. However, like the structure shown in FIGS. 13 to 14, the outer and inner pads 10 and 11 are supported by a single pad pin 9 so as to be freely displaceable in the axial direction of the rotor 2. A structure provided with a reinforcing portion has not been known so far.

  On the other hand, although not shown, the caliper is provided with the intermediate reinforcing portion as described above, and the intermediate reinforcing portion of the opening provided on the radially outer side of the rotor between the outer and inner body portions. It is also conceivable to provide a pair of pad pins on both sides of the opening in a state of being spanned over the opening. In the case of such a structure, through-holes penetrating in the axial direction are formed in the protrusions provided in pairs in the circumferential direction both ends of the pressure plates of the outer and inner pads, and the pad pins are inserted into these through-holes. The intermediate part is inserted through the rotor so as to be freely displaceable in the axial direction. With this configuration, the pads are supported with respect to the caliper so as to be displaceable in the axial direction of the rotor. However, in the case of an opposed piston type disc brake having an intermediate reinforcing portion and a pair of pad pins on both sides of the intermediate reinforcing portion, not only the number of pad pins is increased, but also these pad pins are inserted. It is necessary to form two protrusions on each of the outer and inner pads. For this reason, the cost and weight of the opposed piston type disc brake increase.

  Although not shown, it is also possible to omit the pad pins for supporting the outer and inner pads on the caliper with the caliper having the intermediate reinforcing portion as described above. In this case, both end portions of each pad are supported so as to be displaceable in the axial direction of the rotor by engagement portions provided on the radially inner side of the rotor of both the outer and inner body portions. However, when such a structure is adopted for a disc brake for a two-wheeled vehicle, the outer and inner pads may be inadvertently dropped from the caliper. That is, in a two-wheeled vehicle, when a tire replacement operation is performed, the tire and the rotor are integrally detached from the body of the two-wheeled vehicle. For this reason, when the caliper is provided with the intermediate reinforcing part and does not have a pad pin, when the tire is replaced, after the rotor is removed from between the outer and inner pads, each of these pads is displaced to the partial side. As a result, each of these pads may inadvertently fall out of the caliper. As another inconvenience, when the pad pin is omitted in this way, when the caliper is assembled to a vehicle such as an automobile together with the outer and inner pads, the operator prevents the caliper from falling off while preventing the caliper from falling off. Need to be attached to the vehicle body, and it takes time and effort to assemble.

Japanese Utility Model Publication No. 5-27364 Japanese Utility Model Publication 5-26350 JP 2001-271856 A Utility Model Registration No. 2656698 JP 2001-107994 A Japanese Patent Laid-Open No. 1-210628

  In view of the circumstances as described above, the present invention has a structure in which an intermediate reinforcing portion is provided at the center in the circumferential direction of the rotor of the caliper opening in order to improve the rigidity of the caliper constituting the opposed piston type disc brake. The invention was invented to realize an inexpensive and lightweight structure capable of preventing inadvertent removal of the pad from the caliper.

  The opposed piston type disc brake according to the present invention, for example, as shown in FIGS. 12 to 14 described above, together with the wheels, as in the opposed piston type disc brake described in Patent Documents 1 and 2 and conventionally known. A caliper having an outer body portion and an inner body portion provided with a rotating rotor interposed therebetween, an outer cylinder and an inner cylinder provided opposite to each other on these body portions, and liquid-tight in each of the cylinders A piston fitted in a freely displaceable manner with respect to the axial direction of the rotor, and a pair of pads that freely support the displacement in the axial direction.

In particular, in the opposed piston type disc brake of the present invention, a pad pin is spanned between the two body parts at the circumferential center part of the opening provided radially outward between the two body parts. Provided. Further, the pads are supported by the pad pins so as to freely move in the axial direction of the rotor. Further, an intermediate reinforcing portion is provided at the center in the circumferential direction of the opening, and the intermediate reinforcing portion is spanned between the body portions so as to cover at least the radially outer side of the pad pin.
In the present specification and claims, unless otherwise specified, “circumferential direction” refers to the circumferential direction (= rotation direction) of the rotor, and similarly, “radial direction” refers to the radial direction of the rotor. Say.

  In the case of the opposed piston type disc brake of the present invention configured as described above, an intermediate reinforcing portion is provided at the center in the circumferential direction of the opening provided radially outside between the outer and inner body portions, and this intermediate reinforcing is provided. Since the part is spanned between the two body parts, the caliper can be improved in rigidity as compared with the case where the intermediate reinforcing part is not provided as shown in FIGS. .

  In addition, a pad pin is provided across the body portion between the two body portions at the center portion in the circumferential direction of the opening provided radially outside between the two body portions, and each pad is provided on the pad pin. A displacement in the axial direction of the rotor is freely supported. Further, the intermediate reinforcing portion is spanned between the body portions so as to cover at least the radially outer side of the intermediate portion of the pad pin. For this reason, in order to freely support the displacement of each pad in the axial direction with respect to the caliper, it is sufficient to provide only one pad pin, and the number of parts can be reduced, and the cost and weight can be reduced. Moreover, since each pad is supported on the caliper via the pad pin, even when the tire is replaced when the structure of the present invention is used for a two-wheeled vehicle, the caliper is assembled to the vehicle, etc. It is possible to effectively prevent the pads from being inadvertently dropped from the caliper. In addition, it is easy to use those pads having a symmetrical shape with respect to the center in the circumferential direction of the rotor, and it becomes easy to share the inner and outer pads. As a result, according to the present invention, it is possible to obtain a lightweight and inexpensive structure capable of improving the caliper rigidity and preventing inadvertent removal of each pad from the caliper.

When the present invention is implemented, preferably, as described in claim 2, the intermediate reinforcing portion has a concave portion opposed to the outer peripheral surface in the axial direction of the pad pin in the radial direction of the rotor.
According to this preferred configuration, the outer surface of the intermediate reinforcing portion of the caliper protrudes more outward in the radial direction of the rotor than the other portions of the caliper while achieving both high-quality caliper rigidity and prevention of the pad from falling off. Can be suppressed. For this reason, the caliper can be reduced in weight and size, and the space for arranging the caliper can be effectively used (the layout can be improved). In addition, when changing tires or using a disc brake, it is possible to more effectively prevent other parts or stepping stones from accidentally colliding with the intermediate portion of the pad pin, and damage to the pad pin can be more effectively prevented.

More preferably, a heat radiating through hole penetrating in the radial direction of the rotor is formed in the intermediate reinforcing portion.
According to this more preferable configuration, when the end of the heat radiating through hole is opened on the same side as the traveling direction of the vehicle in a state where the caliper is assembled to the vehicle, regardless of the presence of the intermediate reinforcing portion, The air in the caliper whose temperature has risen due to heat generated by friction between the rotor and each pad can be efficiently discharged out of the caliper by the traveling wind. For this reason, it is possible to easily dissipate heat generated during braking to the surroundings while improving the rigidity of the caliper, and to effectively suppress the temperature rise of the caliper.

  1 to 6 show Embodiment 1 of the present invention. The disc brake 1b according to the present embodiment includes a caliper 5b disposed in a state of straddling the rotor 2 (FIGS. 2 to 5) that rotates together with the wheels. The caliper 5b is integrally formed by casting a light alloy such as an aluminum alloy or an iron-based alloy, and the axial direction of the rotor 2 (the vertical direction in FIG. 2, the front and back directions in FIGS. 3 and 4, and FIG. 5). Left and right direction) outer body 3b and inner body 4b arranged on both sides, and a pair of connecting parts 16 that connect both ends of the body parts 3b and 4b in the circumferential direction (left and right direction in FIGS. 1 to 4). , 16. In the case of this embodiment, two for each of the body parts 3b and 4b, a total of four outer and inner cylinders 17 (only the inner cylinder 17 is shown in FIG. 3, and the outer cylinder is not shown). The outer and inner pistons 19 and 20 are fitted in the respective cylinders 17 in a liquid-tight manner and so as to be displaceable in the axial direction of the rotor 2. The cylinders 17 communicate with each other through oil passages provided in the body parts 3b, 4b and at least one of the connecting parts 16. Therefore, if the pressure oil is supplied to or discharged from any cylinder 19 through the oil supply port 36 provided in the inner body portion 4b, the pressure oil can be supplied to or discharged from all the cylinders 19. Note that the end of the oil passage, which is the upper end when installed in the vehicle, is closed with a bleeder screw 21.

  Further, a pad pin 23 is supported in a state of being spanned between the body parts 3b and 4b at the center part in the circumferential direction of the opening part 22 provided radially outwardly between the body parts 3b and 4b. is doing. That is, wall portions 24, 24 projecting in the radial direction are provided at the peripheral portions on the radially outer side of the positions of the opening portions 22 of these body portions 3 b, 4 b, and the rotor 2 is provided at the circumferential center portion of these wall portions 24, 24. Support holes 25a and 25b (FIGS. 4 and 5) penetrating in the axial direction are formed concentrically with each other. The pad pin 23 has a bowl-like shape with a large-diameter head 26 provided at the base end (the left end in FIGS. 1 and 5, the lower end in FIG. 2, the front end in FIG. 3), and the distal end (see FIG. A locking hole 27 penetrating in the radial direction of the pad pin 23 is formed in the right end portions 1 and 5, the upper end portion in FIG. 2, and the left end portion in FIG. 6. The diameter of the head portion 26 is larger than the inner diameters of the support holes 25a and 25b formed in the body portions 3b and 4b. Then, the pad pin 23 is inserted through the support hole 25b of the inner body portion 4b and the support hole 25a of the outer body portion 3b in order with the tip portion first, and the pad pin 23 protruding from the support hole 25a of the outer body portion 3b. A clip 28 as a retaining member is locked in a locking hole 27 present at the tip. As shown in detail in FIG. 6, the clip 28 is made of a metal wire such as a hard steel wire or other spring material, and a pair of leg portions bent in the same direction from both ends of the base portion 29. 30a, 30b, and one leg 30a is linearly inserted into the locking hole, and the other leg 30b is formed with an arc 31 that can be engaged with the outer peripheral surface of the pad pin 23. Thus, the clip 28 can be prevented from coming off from the locking hole 27. The pad pin 23 that locks the clip 28 is restricted by the clip 28 and the head 26 from being displaced in the axial direction with respect to the caliper 5b, and is hung between the body parts 3b and 4b. It is supported by the caliper 5b in the delivered state.

  Further, the outer and inner pads 10a and 11a are supported on the intermediate portion of the pad pin 23 so as to be freely displaced in the axial direction of the rotor 2. That is, each of these pads 10a and 11a includes a pressure plate 12 and 12 and a lining 38 and 38 attached to one side of each of the pressure plates 12 and 12, and the center in the circumferential direction of each of the pressure plates 12 and 12 is provided. Protrusions 32 and 32 projecting radially outward are formed on the part. In addition, elongated holes 33 and 33 that are long in the circumferential direction of the rotor 2 are formed in the protrusions 32 and 32, respectively. And the intermediate part of the said pad pin 23 is penetrated by these long holes 33 and 33 so that sliding in the axial direction is possible. As a result, the pads 10a and 10b are supported by the pad pin 23 supported by the caliper 5b so as to be freely displaced in the axial direction of the rotor 2. Further, in this state, the flat portions 39, 39 existing in the radially outward portions of the pressure plates 12, 12 constituting the pads 10a, 11a on both sides in the circumferential direction are connected to the inner sides of the connecting portions 16, 16. The side surfaces (surfaces on the sides facing each other between the connecting portions 16 and 16) are in contact with or in close proximity to each other. The plane portions 39 and 39 of the pressure plates 12 and 12 and the inner side surfaces of the connecting portions 16 and 16 can be brought into surface contact with each other.

  Further, an intermediate rib 34, which is an intermediate reinforcing portion, is provided in a state of being spanned between the body portions 3b and 4b at the center in the circumferential direction of the opening 22 of the caliper 5b. That is, on the outer side in the radial direction of the rotor 2 from the portions where the support holes 25a and 25b through which the portions near both ends of the pad pin 23 are inserted in the wall portions 24 and 24 provided in the both body portions 3b and 4b, Both ends of the intermediate rib 34 are joined. Such an intermediate rib 34 is integrally formed with the outer and inner body portions 3b and 4b. Further, a concave portion 35 having a substantially U-shaped cross section opened to the pad 10a, 10b side is formed in the intermediate portion in the longitudinal direction of the intermediate rib 34, and the pressure plate of each of the pads 10a, 10b is formed in the concave portion 35. The tip portions of the protrusions 32, 32 provided at the circumferential central portions of 12, 12 are inserted. Further, an intermediate portion of the pad pin 23 located between the pads 10 a and 10 b is opposed to the concave portion 35 in the radial direction of the rotor 2. The intermediate portion of the pad pin 23 covers the radially outer side of the rotor 2 with the intermediate rib 34.

  At the time of braking, the linings 11 and 11 of the outer and inner pads 10a and 11a supported by the body parts 3b and 4b with the rotor 2 being sandwiched by the pistons 19 and 20 are disposed on both side surfaces of the rotor 2. Braking is performed by pressing.

  In the case of the opposed piston type disc brake of the present embodiment configured as described above, an intermediate reinforcing portion is provided at the center in the circumferential direction of the opening 22 provided radially outside between the outer and inner body portions 3b and 4b. An intermediate rib 34 is provided, and this intermediate rib 34 is stretched between the body parts 3b and 4b. For this reason, as shown in FIGS. 12 to 14 described above, the rigidity of the caliper 5b can be improved as compared with the case where the intermediate rib 34 is not provided. Further, providing the intermediate rib 34 at the central portion in the circumferential direction of the opening 22 can contribute to the most improvement in rigidity (as compared with the case where the intermediate rib 34 is provided in another part).

  In addition, a pad pin 23 is provided at the center in the circumferential direction of the opening portion 22 in a state of being spanned between the body portions 3b and 4b, and the pads 10a and 10b are provided at intermediate portions of the pad pin 23. Is supported freely in the axial displacement of the rotor 2. The intermediate rib 34 is stretched between the body parts 3b and 4b so as to cover the radially outer side of the intermediate part of the pad pin 23. For this reason, in order to support the pads 10a and 10b with respect to the caliper 5b so as to be freely displaced in the axial direction, it is only necessary to provide one pad pin 23, which reduces the number of components, reduces the cost and reduces the weight. Can be planned. Moreover, since the pads 10a and 10b are supported on the caliper 5b via the pad pins 23, when the tire is changed when the structure of this embodiment is used for a two-wheeled vehicle, the caliper 5b It is possible to effectively prevent the pads 10a and 10b from being inadvertently dropped from the caliper 5b even when assembled to a vehicle. Moreover, it is easy to use those pads 10a and 10b that have a symmetrical shape with respect to the center in the circumferential direction of the rotor 2, and it is easy to share the inner and outer pads 10a and 10b. As a result, according to the present invention, it is possible to obtain a lightweight and inexpensive structure that can improve the rigidity of the caliper 5b and prevent the pads 10a and 10b from being accidentally dropped from the caliper 5b.

  Furthermore, in the case of the present embodiment, the intermediate rib 34 has a concave portion 35 that faces the outer peripheral surface of the intermediate portion of the pad pin 23 in the radial direction of the rotor 2. Therefore, while improving the rigidity of the caliper 5b and preventing the pads 10a and 10b from falling off at a high level, the outer surface of the intermediate rib 34 of the caliper 5b is more radially outward than the other parts of the caliper 5b. It is possible to suppress a large protrusion. For this reason, the caliper 5b can be reduced in weight and size, and the space in which the caliper 5b is disposed can be effectively used (an improvement in layout can be achieved). In addition, when changing tires or using the disc brake 1b, it is possible to more effectively prevent other parts or stepping stones from accidentally colliding with the intermediate portion of the pad pin 23, and more effectively prevent damage to the pad pin 23. it can. Further, since the intermediate rib 34 and the pad pin 23 are at the same position in the circumferential direction of the rotor 2, the part area that blocks the opening 22 is small, and the heat dissipation is good.

  Next, FIGS. 7 to 10 show Embodiment 2 of the present invention. In the case of the disc brake 1c of this embodiment, a plurality of lengthwise intermediate portions (three locations in the illustrated example) of the intermediate portion in the lengthwise direction of the intermediate rib 34a that spans the outer and inner body portions 3b and 4b. In addition, heat-dissipating through-holes 37, 37 that respectively penetrate in the radial direction of the rotor 2 (FIGS. 8 to 11) are formed. When the disc brake 1c is used, the caliper 5c is connected to the one connecting portion 16 (left side in FIGS. 7 to 10) provided with the bleeder screw 21 on the upper end side and the other connecting portion 16 (right side in FIGS. 7 to 10). Assemble the vehicle on the lower end side. And among the both ends of each said heat radiating through-holes 37 and 37, the inner edge part inside the radial direction of the rotor 2 is opened on the same side as the advancing direction of a vehicle. Therefore, when the vehicle moves forward, the traveling wind passes through the opening 22 and the heat radiating through holes 37 and 37 from the inside to the outside of the caliper 5b in the directions indicated by arrows a and b in FIGS.

In the case of the present embodiment configured as described above, the inner end portions of the heat dissipation through holes 37 and 37 are opened on the same side as the traveling direction of the vehicle with the caliper 5c assembled to the vehicle as described above. Thus, regardless of the presence of the intermediate rib 34a, the air in the caliper 5c whose temperature has increased due to heat generated by friction between the rotor 2 and the pads 10a and 10b at the time of braking can be efficiently transferred to the outside of the caliper 5c by the traveling wind. Can be discharged. Therefore, while improving the rigidity of the caliper 5c, heat generated during braking can be easily dissipated to the surroundings, and the temperature rise of the caliper 5c can be effectively suppressed.
Since other configurations and operations are the same as in the case of the above-described first embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  In the case of each of the embodiments described above, the intermediate reinforcing portions provided on the calipers 5b and 5c are the intermediate ribs 34 and 34a formed integrally with the outer and inner body portions 3b and 4b. For example, both the outer and inner body parts and the intermediate reinforcing part are separate members, and both ends of the intermediate reinforcing part are fastened with bolts or the like to both the body parts. It may be a member or a member joined by welding or the like. Further, the support structure of the pad pin 23 with respect to the calipers 5b and 5c is such that a male screw portion is formed at the end of the pad pin 23, and this male screw portion is screwed into an axial screw hole provided in a part of the calipers 5b and 5c. -By tightening, the calipers 5b and 5c can be combined. In addition to adopting such a coupling structure of the male screw portion and the screw hole, it is also possible to adopt a structure in which the clip 28 is locked to the locking hole 27 formed in the pad pin 23 as in the above-described embodiments. it can.

  Further, in each of the above-described embodiments, the case where the present invention is applied to a structure including so-called integrated calipers 5b and 5c in which the outer body portion 3b and the inner body portion 4b are integrated has been described. . However, the present invention can also be implemented in a structure including a so-called split type caliper in which the outer and inner body portions are coupled by a plurality of coupling bolts to form a caliper.

The perspective view which shows Example 1 of this invention. FIG. The figure seen from the lower part of FIG. FIG. BB sectional drawing of FIG. The perspective view which takes out the pad pin from FIG. 1 and shows the engagement state of a front-end | tip part and a clip. The perspective view which shows Example 2 of this invention. FIG. The figure seen from the lower part of FIG. CC sectional drawing of FIG. DD sectional drawing of FIG. The perspective view which shows the 1st example of the disk brake conventionally known. Sectional drawing which shows the 2nd example. EE sectional drawing of FIG.

Explanation of symbols

1, 1a, 1b, 1c Disc brake 2 Rotor 3, 3a, 3b Outer body part 4, 4a, 4b Inner body part 5, 5a, 5b, 5c Caliper 6 Coupling bolt 7 Coupling bolt 8 Opening 9 Pad pin 10, 10a Outer pad 11 11a Inner pad 12 Pressure plate 13 Through hole 14 First protrusion 15 Second protrusion 16 Connection part 17 Inner cylinder 19 Outer piston 20 Inner piston 21 Bleeder screw 22 Opening 23 Pad pin 24 Wall parts 25a, 25b Support hole 26 Head 27 Locking hole 28 Clip 29 Base part 30a, 30b Leg part 31 Arc part 32 Projection part 33 Long hole 34, 34a Intermediate rib 35 Recessed part 36 Lubrication port 37 Heat radiating through hole 38 Lining 39 Flat part

Claims (2)

A caliper having an outer body portion and an inner body portion provided with a rotor that rotates together with the wheels, an outer cylinder and an inner cylinder provided opposite to each other on these body portions, and liquid-tight in each of these cylinders An opposed piston type disc brake comprising a piston fitted in a freely displaceable manner in the axial direction of the rotor, and a pair of pads that are supported in a freely displaceable manner in the axial direction.
A pad pin is provided across the two body parts at the center in the circumferential direction of the opening provided radially outwardly between the two body parts, and the pads are attached to the pad pins in the axial direction of the rotor. The intermediate body is provided with an intermediate reinforcing part at the center in the circumferential direction of the opening, and the intermediate reinforcing part covers at least the intermediate part of the pad pin in the radial direction. Opposite piston type disc brake characterized by being spanned between. The opposed piston type disc brake according to claim 1, wherein the intermediate reinforcing portion has a concave portion opposed to the outer circumferential surface of the axial intermediate portion of the pad pin in the radial direction of the rotor.

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