Opposed piston type disc brake device

Abstract

To provide an opposed piston type disc brake device which prevents a communication pipe from floating, and which can improve efficiency of assembly work and reduce the tensile stress applied to a connection between the communication pipe and a caliper compared to the related art.SOLUTION: A communication pipe 3 includes a pipe body 26, a pair of flare nuts 27a, 27b, and a cover tube 28 which covers a part of the pipe body 26 and is in contact with a caliper 2 with a fastening margin, the cover tube being made of an elastic material. The cover tube 28 is pressed against the caliper 2 only in one predetermined direction other than central axis directions of the flare nuts 27a, 27b. The cover tube 28 does not have the fastening margin in the central axis directions of the flare nuts 27a, 27b.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to an opposed-piston disc brake device. [Background technology]

[0002] Disc brake devices are widely used to brake automobiles and motorcycles. When braking with a disc brake device, a pair of pads arranged on both axial sides of a rotor that rotates with the wheel are pressed against both axial sides of the rotor by a piston. Various structures of such disc brake devices have been known in the past, but opposed piston type disc brake devices with pistons on both axial sides of the rotor are increasingly being used in recent years because they can provide a stable braking force.

[0003] 42 to 45 show an opposed piston type disc brake device 100 of a conventional structure described in JP 2022-1782 A (Patent Document 1).

[0004] The opposed-piston disc brake device 100 comprises a caliper 102 arranged to cover from the radial outside a disk-shaped rotor 101 that rotates with the wheel and fixed to the vehicle body, and a pair of pads 103a, 103b supported for axial movement relative to the caliper 102 and arranged on both axial sides of the rotor 101.

[0005] It should be noted that, with respect to the opposed piston type disc brake device 100, the axial direction, circumferential direction, and radial direction refer to the axial direction, circumferential direction, and radial direction of the rotor 101 that rotates together with the wheel, unless otherwise specified.

[0006] The caliper 102 includes an inner body 104 disposed axially inward of the rotor 101, and an outer body 105 disposed axially outward of the rotor 101. Note that the axially inner side refers to the upper side in Fig. 42 and the lower side in Fig. 43 which are the center side in the width direction of the vehicle when the opposed piston type disc brake device 100 of a conventional structure is assembled to the vehicle, and the axially outer side refers to the lower side in Fig. 42 and the upper side in Fig. 43 which are the outer side in the width direction of the vehicle when the opposed piston type disc brake device 100 is assembled to the vehicle.

[0007] The inner body 104 has a plurality of inner cylinders 106. An inner piston 107 is fitted in each of the inner cylinders 106 so as to be displaceable in the axial direction.

[0008] The outer body 105 has a plurality of outer cylinders 108. An outer piston 109 is fitted into each of the outer cylinders 108 so as to be axially displaceable.

[0009] The inner body 104 has an inner oil hole (not shown) therein for supplying and discharging brake oil to the deep parts of the inner cylinders 106. The inner oil hole communicates with the deep parts of each of the inner cylinders 106.

[0010] The outer body 105 has an outer oil hole (not shown) formed therein for supplying and discharging brake oil to the deep parts of the outer cylinders 108. The outer oil hole communicates with the deep parts of each of the outer cylinders 108.

[0011] One circumferential end of each of the inner oil hole and the outer oil hole is connected by a communication pipe 110. This allows the inner oil hole and the outer oil hole to communicate with each other. The other circumferential end of each of the inner oil hole and the outer oil hole is blocked by a bleeder screw 111.

[0012] The inner body 104 and the outer body 105 are connected in the axial direction by a rotation-in side connecting portion 112 , a rotation-out side connecting portion 113 , and an intermediate connecting portion 114 .

[0013] In the opposed piston type disc brake device 100 of the conventional structure, one circumferential side corresponds to the rotation-in side when the vehicle moves forward, and the other circumferential side corresponds to the rotation-out side when the vehicle moves forward.

[0014] During braking, brake oil is sent from the master cylinder to the inner oil hole through a brake hose connected to the inner body 104. This pushes the inner piston 107 axially out of the inner cylinder 106, and presses the pad 103a supported by the inner body 104 against the axially inner surface of the rotor 101. Also, brake oil is sent from the inner oil hole to the outer oil hole through the communication pipe 110. This pushes the outer piston 109 axially out of the outer cylinder 108, and presses the pad 103b supported by the outer body 105 against the axially outer surface of the rotor 101. As a result, the rotor 101 is tightly clamped from both axial sides by the pair of pads 103a, 103b, and the vehicle is braked.

[0015] The communicating pipe 110 is disposed around the caliper 102 so as to cover one circumferential side of the caliper 102. The communicating pipe 110 has a pipe body 115, a pair of flare nuts 116a, 116b, and a covering tube 117.

[0016] The pipe body 115 is made of metal and has a substantially U-shape when viewed in the radial direction.

[0017] The pair of flare nuts 116a and 116b are aligned along the central axis O. a , O bare disposed approximately parallel to each other, and are provided at both end portions of the pipe body 115 to be capable of relative rotation with respect to the pipe body 115. One flare nut 116a is provided at one end portion of the pipe body 115, and is screwed and connected to one circumferential side portion of the inner body 104. The other flare nut 116b is provided at the other end portion of the pipe body 115, and is screwed and connected to one circumferential side portion of the outer body 105.

[0018] In the opposed piston type disc brake device 100 of the conventional structure, the central axes O of the pair of flare nuts 116a and 116b are a , O b 42 and 43). Therefore, the central axis direction of the flare nuts 116a, 116b approximately coincides with the circumferential direction.

[0019] The covering tube 117 is made of an elastic material and has a cylindrical shape. The covering tube 117 covers the middle part of the pipe body 115.

[0020] The covering tube 117 is in contact with the caliper 102 with an interference therebetween, with one flare nut 116a being screwed and connected to the inner body 104 and the other flare nut 116b being screwed and connected to the outer body 105.

[0021] Specifically, the covering tube 117 is in contact with a first contact surface 118 and a second contact surface 119 provided on the rotation-inlet connecting portion 112 constituting the caliper 102 with a tightening margin. The first contact surface 118 is flat and faces one side in the circumferential direction. In contrast, the second contact surface 119 is flat, disposed at a substantially right angle to the first contact surface 118, and faces radially outward.

[0022] In the opposed piston type disc brake device 100 of the conventional structure, the covering tube 117 made of an elastic material is brought into contact with the caliper 102 with a tightening margin, thereby preventing the communicating tube 110 from lifting off the caliper 102 and preventing a gap from occurring between the covering tube 117 and the caliper 102. This prevents the unpainted parts of the surface of the caliper 102 that are covered by the covering tube 117 from being exposed, and also prevents the communicating tube 110 from interfering with the wheels arranged around the opposed piston type disc brake device 100. [Prior art documents] [Patent documents]

[0023] [Patent Document 1] Patent Publication No. 2022-1782 Summary of the Invention [Problem to be solved by the invention]

[0024] When the flare nuts 116a and 116b are screwed to the inner body 104 and the outer body 105, the flare nuts 116a and 116b are screwed to the central axis O. a , O b The flare nuts 116a, 116b are rotated about the center axis direction to move the communicating tube 110 in a circumferential direction that generally coincides with the central axis direction of the flare nuts 116a, 116b so as to approach the caliper 102. Specifically, the communicating tube 110 is moved to the other circumferential side, which is the proximal side with respect to the caliper 102.

[0025] However, in the opposed piston type disc brake device 100 of the conventional structure, the covering tube 117 is brought into contact with the first contact surface 118 facing one circumferential side with a tightening margin, so when the communicating tube 110 is moved to the other circumferential side, it is necessary to increase the amount of elastic deformation of the covering tube 117 relative to the first contact surface 118. This increases the tightening torque of the flare nuts 116a, 116b, and there is a possibility that the efficiency of the assembly work of the opposed piston type disc brake device 100 will decrease.

[0026] Increasing the interference of the covering tube 117 with respect to the first contact surface 118 is advantageous in terms of preventing the communicating pipe 110 from floating up, but if the interference is too large, excessive tensile stress may be applied to the connection between the communicating pipe 110 and the caliper 102. As a result, the sealing performance of the connection may decrease, and the defective rate of the opposed piston type disc brake device 100 may increase.

[0027] The present invention has been made to solve the above-mentioned problems, and has an object to provide an opposed-piston type disc brake device that can improve the efficiency of assembly work compared to conventional techniques while preventing the connecting pipe from floating up relative to the caliper, and can reduce the tensile stress applied to the connection between the connecting pipe and the caliper. [Means for solving the problem]

[0028] An opposed-piston disc brake device according to one aspect of the present invention includes a caliper and a communication pipe. The caliper includes an inner body having an inner cylinder, and an outer body having an outer cylinder. The communication pipe is disposed around the caliper and connects the inner cylinder and the outer cylinder. The communicating pipe has a pipe body, a pair of flare nuts that are provided at both ends of the pipe body so as to be able to rotate relative to the pipe body with their respective central axes arranged approximately parallel to each other, and that are threadedly connected to the inner body and the outer body, respectively, and a covering tube made of an elastic material that covers a portion of the pipe body and is in contact with the caliper with a tightening margin. In the opposed-piston disc brake device according to one aspect of the present invention, the covering tube has no interference with the caliper in the central axis direction of the flare nut. In this specification and claims, "approximately parallel" means not only completely parallel but also substantially parallel.

[0029] In the opposed-piston disc brake device according to one aspect of the present invention, a gap can be provided between the covering tube and the caliper in the direction of the central axis of the flare nut. Alternatively, in the opposed-piston disc brake device according to one aspect of the present invention, the covering tube and the caliper can be brought into contact with each other without any interference in the central axial direction of the flare nut (zero touch).

[0030] In the opposed-piston disc brake device according to one aspect of the present invention, the covering tube can be pressed against the caliper only in one predetermined direction other than the central axis direction of the flare nut. Alternatively, in the opposed-piston disc brake device according to one aspect of the present invention, the covering tube can be pressed against the caliper in a plurality of predetermined directions other than the central axis direction of the flare nut.

[0031] In the opposed-piston disc brake device according to one aspect of the present invention, the covering tube can be pressed against the caliper in a direction substantially perpendicular to the central axis direction of the flare nut. In this specification and claims, the term "approximately perpendicular" refers to not only a completely perpendicular direction but also a substantially perpendicular direction. Specifically, it includes cases where the angle deviation from the completely perpendicular direction is 15 degrees or less.

[0032] In the opposed-piston disc brake device according to one aspect of the present invention, the central axis direction of the flare nut can be approximately aligned in the circumferential direction, and the covering tube can be pressed against a surface of the caliper facing radially outward. Alternatively, the central axis direction of the flare nut can be made to substantially coincide with the circumferential direction, and the covering tube can be pressed against a surface of the caliper that faces radially inward. Alternatively, the central axis direction of the flare nut can be made to substantially coincide with the circumferential direction, and the covering tube can be pressed against a surface of the caliper facing inward in the axial direction or a surface facing outward in the axial direction. In this specification and the claims, the term "approximately the same" means not only a perfect match but also a substantial match.

[0033] In the opposed-piston disc brake device according to one aspect of the present invention, the central axis direction of the flare nut can be made to substantially coincide with the radial direction.

[0034] In an opposed-piston type disc brake device according to one aspect of the present invention, the caliper further has a connecting portion connecting a circumferential end of the inner body and a circumferential end of the outer body, and the covering tube can be pressed against the connecting portion. In the opposed-piston disc brake device according to one aspect of the present invention, the covering tube can be pressed against another portion of the inner body, the outer body, or the caliper.

[0035] In the opposed-piston disc brake device according to one aspect of the present invention, a surface of the caliper with which the covering tube comes into contact with an interference can be made flat. In the opposed-piston disc brake device according to one aspect of the present invention, the surface of the caliper with which the covering tube contacts with a tightening margin can be a concave-convex surface having a concave-convex shape, a stepped surface having a stepped shape, or a curved surface having a curved shape in a cross section perpendicular to the central axis of the flare nut.

[0036] In an opposed-piston disc brake device according to one aspect of the present invention, the central axes of the pair of flare nuts and the surfaces of the caliper with which the covering tube contacts with a tightening margin can be arranged approximately parallel to each other.

[0037] In the opposed-piston disc brake device according to one aspect of the present invention, the covering cylinder may have a cylindrical shape in a free state. Alternatively, in the opposed-piston disc brake device according to one aspect of the present invention, the covering tube may have a rectangular tube shape in a free state.

[0038] In the opposed-piston disc brake device according to one aspect of the present invention, the caliper may have a protrusion at a portion that comes into contact with the covering tube.

[0039] In the opposed-piston disc brake device according to one aspect of the present invention, the covering tube may have a protrusion at a portion that comes into contact with the caliper.

[0040] In the opposed-piston disc brake device according to one aspect of the present invention, the protrusion can be caused to protrude in a direction substantially perpendicular to the central axis of the flare nut.

[0041] In the opposed-piston disc brake device according to one embodiment of the present invention, the protrusion can be arranged on an orthogonal plane that passes through positions that are equidistant to the central axes of the pair of flare nuts and is perpendicular to the imaginary plane that includes the central axes of the pair of flare nuts.

[0042] In the opposed piston type disc brake device according to one embodiment of the present invention, the protrusion can be any one of a prismatic shape (including a triangular prism shape, a square prism shape, etc.), a pyramidal shape (including a triangular prism shape, a square prism shape, etc.), a cylindrical shape (including a semi-cylinder shape), a conical shape, and a hemispherical shape.

[0043] In an opposed-piston disc brake device according to one embodiment of the present invention, one or more of the protrusions may be provided on either the caliper or the covering tube, or one or more of the protrusions may be provided on both the caliper and the covering tube.

[0044] In the opposed-piston disc brake device according to one aspect of the present invention, the covering tube can be composed of a tube main body covering the pipe main body, and the protrusion provided on a surface of the tube main body. In this case, the thickness of the tubular body can be made greater than the thickness of the protrusion. In the opposed-piston disc brake device according to one aspect of the present invention, the dimensions of the tubular main body and the protrusions in the axial direction of the tubular main body may be different from each other or may be the same from each other. Effect of the Invention

[0045] According to an opposed-piston disc brake device of one aspect of the present invention, it is possible to prevent the communicating pipe from floating up relative to the caliper, while improving the efficiency of assembly work compared to conventional techniques and reducing the tensile stress applied to the connection between the communicating pipe and the caliper. [Brief description of the drawings]

[0046] [Figure 1] FIG. 1 is a front view showing an opposed piston type disc brake device according to a first embodiment. [Diagram 2] FIG. 2 is a plan view showing an opposed piston type disc brake device according to a first example of the embodiment. [Diagram 3] FIG. 3 is a side view of the opposed piston type disc brake device according to the first embodiment, as viewed from the rotation inlet side. [Figure 4] FIG. 4 is a side view of the opposed piston type disc brake device according to the first embodiment, as viewed from the rotation side. [Diagram 5] FIG. 5 is a bottom view showing the opposed piston type disc brake device according to the first embodiment. [Figure 6] FIG. 6 is a rear view showing the opposed piston type disc brake device according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line BB in FIG. 1, which passes through the centers of three cylinders arranged radially outward. [Figure 9] FIG. 9 is a partially enlarged view of FIG. [Figure 10]FIG. 10(A) is a partially enlarged view of FIG. 5, and FIG. 10(B) is a view in which the communication pipe is omitted from FIG. 10(A). [Figure 11] FIG. 11(A) is a partially enlarged view of FIG. 7, and FIG. 11(B) is a view in which the communication pipe is omitted from FIG. 11(A). [Figure 12] FIG. 12 is a partially enlarged view of FIG. [Figure 13] FIG. 13 is a perspective view showing an opposed-piston type disc brake device according to a first example of an embodiment, as viewed from the axially outer side, the radially outer side, and the rotation side. [Figure 14] FIG. 14 is a perspective view of an opposed-piston type disc brake device according to a first example of an embodiment, viewed from the axially inner side, the radially outer side, and the rotation side. [Figure 15] FIG. 15 is a perspective view of an opposed-piston type disc brake device according to a first example of an embodiment, viewed from the axially outer side, the radially inner side, and the rotation side. [Figure 16] FIG. 16 is a perspective view showing an opposed-piston type disc brake device according to a first example of an embodiment, as viewed from the axially inner side, the radially inner side, and the rotation side. [Figure 17] FIG. 17 shows a connecting pipe taken out from an opposed-piston disc brake device according to a first example of an embodiment, in which (A) is a front view, (B) is a plan view, (C) is a bottom view, (D) is a right side view, (E) is a left side view, and (F) is a rear view. [Figure 18] FIG. 18 is a cross-sectional view taken along line CC in FIG. [Figure 19] FIG. 19 is a view illustrating the opposed piston type disc brake device according to the first embodiment, taken out of the communication pipe, and explaining the pressing direction against the caliper. [Figure 20] FIG. 20 is a diagram showing a second example of the embodiment, and corresponds to FIG. [Figure 21] FIG. 21 is a diagram showing a second example of the embodiment, and corresponds to FIG. [Figure 22] FIG. 22 is a diagram showing a second example of the embodiment, and corresponds to FIG. [Figure 23]FIG. 23 is a diagram showing a second example of the embodiment, and corresponds to FIG. [Figure 24] FIG. 24 is a diagram showing a second example of the embodiment, and corresponds to FIG. [Diagram 25] FIG. 25 is a partially enlarged view of FIG. 20 showing a second example of the embodiment. [Figure 26] FIG. 26(A) is a partially enlarged view of FIG. 21, and FIG. 26(B) is a view in which the connecting pipe is omitted from FIG. 26(A). [Figure 27] FIG. 27(A) is a partially enlarged view of FIG. 24, and FIG. 27(B) is a view in which the connecting pipe is omitted from FIG. 27(A). [Figure 28] FIG. 28 is a perspective view of an opposed-piston type disc brake device according to a second embodiment, viewed from the axially outer side, the radially outer side, and the rotation-in side. [Figure 29] FIG. 29 is a perspective view of an opposed-piston type disc brake device according to a second embodiment, viewed from the axially inner side, radially outer side, and rotation-in side. [Diagram 30] FIG. 30 is a perspective view of an opposed-piston type disc brake device according to a second embodiment, viewed from the axially outer side, radially inner side, and rotation-in side. [Diagram 31] FIG. 31 is a diagram showing a second example of the embodiment, and corresponds to FIG. [Diagram 32] FIG. 32 is a diagram showing a third example of the embodiment, and corresponds to FIG. [Diagram 33] FIG. 33 is a diagram showing a third example of the embodiment, and corresponds to FIG. [Diagram 34] FIG. 34 is a diagram showing a third example of the embodiment, and corresponds to FIG. [Diagram 35] FIG. 35 is a schematic view taken along the line D in FIG. 34(A) showing a third example of the embodiment. [Diagram 36] FIG. 36 is a diagram showing a modification of the third example of the embodiment, which corresponds to FIG. [Figure 37] FIG. 37 is a diagram showing a fourth example of the embodiment, and corresponds to FIG. [Figure 38]FIG. 38 is a diagram showing a fourth example of the embodiment, and corresponds to FIG. [Figure 39] FIG. 39 is a diagram showing a fourth example of the embodiment, and corresponds to FIG. [Diagram 40] FIG. 40 is a schematic view taken along the line E in FIG. 39(A) showing a fourth example of the embodiment. [Diagram 41] FIG. 41 is a diagram showing a modification of the fourth example of the embodiment, and corresponds to FIG. [Diagram 42] FIG. 42 is a plan view showing an opposed piston type disc brake device of a conventional structure. [Diagram 43] FIG. 43 is a bottom view showing an opposed piston type disc brake device of a conventional structure. [Diagram 44] FIG. 44 is a cross-sectional view taken along the line FF in FIG. [Diagram 45] FIG. 45 is a partially enlarged view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] [First Example of Implementation] The first example of the embodiment will be described with reference to FIGS. 1 to 19. FIG.

[0048] The opposed piston type disc brake device 1 of this embodiment is used for braking an automobile, and includes a caliper 2, a communication pipe 3, and a pair of pads 4a, 4b.

[0049] In this specification and claims, unless otherwise specified, the terms "axial direction," "circumferential direction," and "radial direction" refer to the axial direction, circumferential direction, and radial direction of the disk-shaped rotor 5 (see Fig. 2) that rotates together with the wheel. The front-to-back directions in Fig. 1, 6, 7, 9, and 11, the up-down directions in Fig. 2, 5, 8, 10, and 12, and the left-to-right directions in Fig. 3 and 4 correspond to the axial direction, and the center side of the width direction of the vehicle when the opposed piston type disc brake device 1 is assembled to the vehicle is referred to as the axial inner side, and the outer side of the width direction of the vehicle when the opposed piston type disc brake device 1 is assembled to the vehicle is referred to as the axial outer side. Also, the left-right direction in Fig. 1, Fig. 2, Fig. 5 to Fig. 12, and the front-back direction in Fig. 3 and Fig. 4 correspond to the circumferential direction, the right side in Fig. 1, Fig. 2, Fig. 5, Fig. 7 to Fig. 12, the left side in Fig. 6, the front side in Fig. 3, and the back side in Fig. 4 are referred to as one circumferential side, and the left side in Fig. 1, Fig. 2, Fig. 5, Fig. 7 to Fig. 12, the right side in Fig. 6, the back side in Fig. 3, and the front side in Fig. 4 are referred to as the other circumferential side. In this example, the one circumferential side corresponds to the inflow side when the vehicle moves forward, and the other circumferential side corresponds to the outflow side when the vehicle moves forward. In addition, the up-and-down directions in Figures 1, 3, 4, 6, 7, 9 and 11, and the front-to-back directions in Figures 2, 5, 8, 10 and 12 correspond to the radial direction, and the upper sides of Figures 1, 3, 4, 6, 7, 9 and 11, the front sides of Figures 2, 8 and 12, and the back sides of Figures 5 and 10 are referred to as the radial outer sides, and the lower sides of Figures 1, 3, 4, 6, 7, 9 and 11, the back sides of Figures 2, 8 and 12, and the front side of Figures 5 and 10 are referred to as the radial inner sides.

[0050] Caliper The caliper 2 is disposed so as to cover a portion of the circumferential direction of the rotor 5 from the radially outer side, and is supported and fixed to a knuckle constituting a suspension device. The caliper 2 is integrally formed by forging a material made of a light alloy such as an aluminum alloy or an iron-based alloy, and supports a pair of pads 4a, 4b so as to be movable in the axial direction. The caliper 2 has an overall boat-like shape, and as shown in Figures 1 and 6, has a substantially bow-like shape when viewed in the axial direction.

[0051] The caliper 2 includes an inner body 6, an outer body 7, an inlet side connecting portion 8, an outlet side connecting portion 9, and an intermediate connecting portion 10.

[0052] The inner body 6 and the outer body 7 are disposed on either side of the rotor 5 in the axial direction so as to sandwich the rotor 5 therebetween.

[0053] The inner body 6 is disposed axially inward of the rotor 5. The inner body 6 has a plurality of (five in the illustrated example) inner cylinders 11. An inner piston 12 is fitted into each of the inner cylinders 11 so as to be displaceable in the axial direction.

[0054] 8, the inner body 6 has an inner-side oil hole 13 therein for supplying and discharging brake oil to the deepest part of the inner cylinder 11. The inner-side oil hole 13 extends in the circumferential direction and communicates with the deepest parts of each of the inner cylinders 11.

[0055] The inner body 6 has a connection port 14 for connecting a brake hose (not shown). The connection port 14 communicates with the inner side oil passage hole 13.

[0056] The outer body 7 is disposed axially outward of the rotor 5. The outer body 7 has a plurality of (five in the illustrated example) outer cylinders 15. An outer piston 16 is fitted into each of the outer cylinders 15 so as to be displaceable in the axial direction.

[0057] 8, the outer body 7 has an outer oil hole 17 therein for supplying and discharging brake oil to the deepest portion of the outer cylinder 15. The outer oil hole 17 extends in the circumferential direction and communicates with the deepest portion of each of the outer cylinders 15.

[0058] The other circumferential end portions of the inner-side oil hole 13 and the outer-side oil hole 17 are open toward the other circumferential side at the other circumferential sides of the inner body 6 and the outer body 7, respectively.

[0059] The other circumferential ends of the inner-side oil hole 13 and the outer-side oil hole 17 are connected to each other by a communication pipe 3. This allows the inner-side oil hole 13 and the outer-side oil hole 17 to communicate with each other.

[0060] 12, the other circumferential end of each of the inner-side oil hole 13 and the outer-side oil hole 17 is provided with a female thread portion 18. Flare nuts 27a, 27b (described below) that constitute the communicating pipe 3 are screwed into the female thread portion 18. The female thread portion 18 of the inner-side oil hole 13 and the female thread portion 18 of the outer-side oil hole 17 are disposed parallel to each other.

[0061] A conical concave pressed surface 19 is provided at the other circumferential end of each of the inner-side oil hole 13 and the outer-side oil hole 17, at a portion on the inner side (one circumferential side) of the female thread portion 18. A seal surface 32 provided at the end of a pipe main body 26 (described later) constituting the communicating pipe 3 is pressed against the pressed surface 19.

[0062] One circumferential end of each of the inner-side oil hole 13 and the outer-side oil hole 17 opens toward one circumferential side at one circumferential side of each of the inner body 6 and the outer body 7.

[0063] One circumferential end of each of the inner oil hole 13 and the outer oil hole 17 is closed by a bleeder screw 20 .

[0064] As shown in FIG. 7, each of the inner body 6 and the outer body 7 includes a pin 21 and a guide groove 22 for supporting the pads 4a, 4b movably in the axial direction.

[0065] The pin 21 is provided on the radially inner side of one circumferential side of each of the inner body 6 and the outer body 7, and is arranged parallel to the central axis of the rotor 5. The pin 21 is supported and fixed to each of the inner body 6 and the outer body 7. A pair of pins 21 supported and fixed to each of the inner body 6 and the outer body 7 are arranged coaxially with each other. Of the pair of pins 21, a tip portion of one pin 21 supported and fixed to the inner body 6 protrudes axially outward from the axial outer side surface of the inner body 6 and faces the axial inner side surface of the rotor 5 via a gap. On the other hand, a tip portion of the other pin 21 supported and fixed to the outer body 7 protrudes axially inward from the axial inner side surface of the outer body 7 and faces the axial outer surface of the rotor 5 via a gap. The tip portions of each of the pair of pins 21 are configured in a substantially cylindrical shape and have a cylindrical outer peripheral surface shape.

[0066] The guide groove 22 is provided in a guide wall portion 23 provided to protrude in the axial direction on the axially inner side of the other circumferential side portion of each of the inner body 6 and the outer body 7. The guide groove 22 is provided in a radial middle portion of the guide wall portion 23, and opens to the axial side surface (side surface on the rotor 5 side) and one circumferential side surface of the guide wall portion 23, respectively.

[0067] The rotation-inlet side connecting portion 8 and the rotation-outlet side connecting portion 9 are each disposed radially outside the rotor 5, and axially connect the circumferential ends of the inner body 6 and the outer body 7. The rotation-inlet side connecting portion 8 and the rotation-outlet side connecting portion 9 are each curved in an arc along the outer circumferential edge of the rotor 5, and cover the rotor 5 from the radial outside with a predetermined gap therebetween.

[0068] The rotation-in side connecting portion 8 connects circumferential ends of the inner body 6 and the outer body 7 together in the axial direction.

[0069] The outlet side connecting portion 9 connects the other circumferential ends of the inner body 6 and the outer body 7 to each other in the axial direction.

[0070] As shown in Figures 10(B) and 11(B), the outlet-side coupling part 9 has a contact surface 24 at the axial middle part of the end part on the other circumferential side. The contact surface 24 is provided on the end face on the other circumferential side of the outlet-side coupling part 9, is flat, and faces radially inward. The contact surface 24 is disposed radially inward from the female thread parts 18 provided on each of the inner body 6 and the outer body 7. The contact surface 24 is also aligned with the central axis of the female thread parts 18 provided on each of the inner body 6 and the outer body 7 and the central axis O of the flare nuts 27a, 27b (described later) that constitute the communicating pipe 3. a , O b In this example, the contact surface 24 has a substantially square shape with its axial width and circumferential width being substantially the same.

[0071] The outlet side connecting portion 9 has a pair of inclined surfaces 25a, 25b on both axial sides of the contact surface 24, which extend radially outward as they move away from the contact surface 24 in the axial direction.

[0072] The intermediate connecting portion 10 is disposed radially outward of the rotor 5, and axially connects circumferential intermediate portions of the inner body 6 and the outer body 7. The intermediate connecting portion 10 is spaced apart from the rotation-inlet side connecting portion 8 and the rotation-outlet side connecting portion 9 in the circumferential direction.

[0073] <Communication pipe> The communication pipe 3 is disposed around the caliper 2 so as to cover the other circumferential side portion of the caliper 2 from the other circumferential side.

[0074] The communication pipe 3 has a pipe body 26, a pair of flare nuts 27a, 27b, and a covering tube .

[0075] The pipe body 26 is made of metal and has a substantially U-shape when viewed in the radial direction.

[0076] The pipe body 26 has an axial extension portion 29 that extends in an approximately linear manner in the axial direction so as to straddle the rotor 5, and a pair of circumferential extension portions 30a, 30b that extend from both axial ends of the axial extension portion 29 toward one circumferential side and radially outward.

[0077] With the communicating pipe 3 connected to the caliper 2, the axially extending portion 29 is disposed radially inside the end portion on the other circumferential side of the outlet-side connecting portion 9.

[0078] As shown in Fig. 18, the pipe body 26 has bent portions 31 at both ends, each of which has a larger outer diameter than the remaining portions. That is, a pair of circumferentially extending portions 30a, 30b constituting the pipe body 26 has a bent portion 31 at one end in the circumferential direction. The bent portion 31 has a substantially V-shaped cross section and a conical convex seal surface 32 facing one circumferential side. The bent portion 31 functions as a retainer for the flare nuts 27a, 27b.

[0079] The pair of flare nuts 27a, 27b have a substantially cylindrical shape and each have a central axis O. a , O b In a state in which the flare nuts 27a, 27b are arranged approximately parallel to each other, the flare nuts 27a, 27b are provided at both end portions of the pipe body 26 so as to be capable of relative rotation with respect to the pipe body 26. Specifically, the flare nuts 27a, 27b are loosely fitted into portions of the circumferential extending portions 30a, 30b that are offset from the bent portion 31 to the other circumferential side so as to be capable of relative rotation with respect to the circumferential extending portions 30a, 30b.

[0080] The flare nuts 27a, 27b have an external thread portion 33 on the outer circumferential surface. The flare nuts 27a, 27b have an outer diameter larger than that of the bent portion 31.

[0081] Of the flare nuts 27a, 27b, the flare nut 27a is loosely fitted into one circumferential end of the circumferential extension portion 30a, which is arranged axially inward from the rotor 5, and is threadedly connected to the other circumferential side portion of the inner body 6.

[0082] Specifically, as shown in FIG. 12, the flare nut 27a is threadedly connected to the other circumferential side of the inner body 6 by screwing the male threaded portion 33 on the outer peripheral surface into the female threaded portion 18 on the inner side oil hole 13.

[0083] Furthermore, when the male thread portion 33 is screwed into the female thread portion 18, the bent portion 31 provided on the circumferentially extending portion 30a is pressed toward one side in the circumferential direction by the flare nut 27a, thereby pressing the seal surface 32 of the bent portion 31 against the pressed surface 19 provided on the inner-side oil hole 13. This brings the seal surface 32 and the pressed surface 19 into close contact (surface contact), ensuring the tightness of the connection between the communicating pipe 3 and the inner body 6.

[0084] Of the flare nuts 27a, 27b, the other flare nut 27b is loosely fitted into one circumferential end of the circumferential extension portion 30b, which is arranged axially outside the rotor 5, and is threadedly connected to the other circumferential side portion of the outer body 7.

[0085] Specifically, the flare nut 27b is threadedly connected to the other circumferential side of the outer body 7 by screwing the male threaded portion 33 on its outer peripheral surface into the female threaded portion 18 on the outer side oil hole 17.

[0086] Furthermore, when the male thread portion 33 is screwed into the female thread portion 18, the bent portion 31 provided on the circumferentially extending portion 30b is pressed toward one circumferential side by the flare nut 27b, thereby pressing the seal surface 32 of the bent portion 31 against the pressed surface 19 provided on the outer-side oil hole 17. This brings the seal surface 32 and the pressed surface 19 into close contact with each other, ensuring the tightness of the connection between the communicating pipe 3 and the outer body 7.

[0087] In the opposed piston type disc brake device 1 of this embodiment, the central axes O of the pair of flare nuts 27a and 27b are the same. a , O b Therefore, the central axis direction of the flare nuts 27a, 27b substantially coincides with the circumferential direction.

[0088] The covering tube 28 is made of an elastic material such as rubber, and has a cylindrical shape in a free state. The covering tube 28 covers an axial middle portion of the axial extension portion 29 constituting the pipe body 26. As a result, the covering tube 28 is disposed radially inside the end portion on the other circumferential side of the rotation-side connecting portion 9 constituting the caliper 2. In addition, the central axis of the covering tube 28 is disposed approximately parallel to the central axis of the rotor 5.

[0089] The covering tube 28 is in contact with the caliper 2 with an interference therebetween, with one flare nut 27a being screwed and connected to the inner body 6 and the other flare nut 27b being screwed and connected to the outer body 7.

[0090] However, in this example, the covering tube 28 does not have a tightening margin with respect to the caliper 2 in the central axis direction (circumferential direction) of the flare nuts 27a, 27b.

[0091] In this example, the covering tube 28 is pressed against the caliper 2 only in one predetermined direction other than the central axis direction of the flare nuts 27a, 27b. In other words, the covering tube 28 is pressed against the caliper 2 only in one direction, and the pressing direction of the covering tube 28 against the caliper 2 does not coincide with the central axis direction of the flare nuts 27a, 27b.

[0092] Specifically, the covering tube 28 contacts only the contact surface 24 of the caliper 2 that faces the radial inside and is provided on the rotation-side connecting portion 9, and is pressed against the contact surface 24 toward the radial outside (upper side in Figs. 9 and 11(A), back side in Fig. 10(A)) that is substantially perpendicular to the central axis direction of the flare nuts 27a, 27b. Therefore, the covering tube 28 is pressed against the caliper 2 only toward the radial outside, and is in contact with the caliper 2 with only a radial tightening margin. Therefore, the covering tube 28 does not have a circumferential tightening margin that substantially coincides with the central axis direction of the flare nuts 27a, 27b with respect to the caliper 2. A gap 34 is provided between the covering tube 28 and the caliper 2 in the central axis direction of the flare nuts 27a, 27b.

[0093] In this example, the covering tube 28 is in contact only with the contact surface 24 of the caliper 2, so a gap is provided between the radially outer portion of the outer circumferential surface of the covering tube 28 and the inclined surfaces 25a, 25b provided on both axial sides of the contact surface 24. Therefore, only the radially outer portion of the axially intermediate portion of the covering tube 28 that is in contact with the contact surface 24 is elastically deformed.

[0094] In this example, the covering tube 28 is pressed only radially outward against the caliper 2, and therefore, during the operation of connecting the communicating pipe 3 to the caliper 2, the movement (motion) of the covering tube 28 is restricted only to the radially outward movement by the caliper 2. In other words, the movement of the covering tube 28 in any direction other than the radially outward direction can be performed without being restricted by the caliper 2.

[0095] In this example, the axial dimension of the covering tube 28 is larger than the axial width of the contact surface 24. In the illustrated example, the axial dimension of the covering tube 28 is approximately five times the axial width of the contact surface 24. Also, the outer diameter of the covering tube 28 is larger than the circumferential width of the contact surface 24.

[0096] The other circumferential end of the covering tube 28 is disposed at approximately the same circumferential position as the other circumferential end of the outlet-side coupling portion 9. However, the other circumferential end of the covering tube 28 may be disposed on the other circumferential side of the other circumferential end of the outlet-side coupling portion 9, or may be disposed on the one circumferential side.

[0097] When connecting the communication pipe 3 to the caliper 2, first, with the radially outer end of the covering tube 28 in contact with the contact surface 24, the flare nuts 27a, 27b are inserted into the other circumferential ends of the inner side oil hole 13 and the outer side oil hole 17, respectively, and the flare nuts 27a, 27b are aligned with the central axis O. a , O bAs a result, the male threaded portions 33 provided on the outer peripheral surfaces of the flare nuts 27a, 27b are screwed into the female threaded portions 18 provided on the inner-side oil hole 13 and the outer-side oil hole 17, and the entire communicating pipe 3 is moved to one circumferential direction that is closer to the caliper 2, in the circumferential direction that approximately coincides with the central axis direction of the flare nuts 27a, 27b. Then, the sealing surfaces 32 provided on the ends on both sides of the pipe body 26 are pressed against the pressed surfaces 19 provided on the inner-side oil hole 13 and the outer-side oil hole 17, respectively.

[0098] <pad> Each of the pair of pads 4a, 4b includes a lining 35 and a metal pressure plate 36 that supports the back surface of the lining 35.

[0099] The pressure plate 36 has an ear portion 37 at a radially intermediate portion of the end portion on the other circumferential side, the ear portion 37 protruding toward the other circumferential side beyond the lining 35 .

[0100] The ear portion 37 is configured in a substantially rectangular plate shape, and is engaged with the guide grooves 22 provided in each of the inner body 6 and the outer body 7 so as to be movable in the axial direction.

[0101] The pressure plate 36 has a generally triangular protruding plate portion 38 that protrudes from the lining 35 in the circumferential direction at a radially inner portion of one end portion in the circumferential direction. An insertion hole 39 is formed in the protruding plate portion 38, penetrating in the axial direction. The insertion hole 39 is generally rectangular in the axial view, and opens only on both axial sides of the protruding plate portion 38. The pins 21 provided on the inner body 6 and the outer body 7 are loosely inserted into the inside of the insertion hole 39. As a result, the insertion hole 39 is engaged with the pin 21 so as to be axially movable.

[0102] As described above, each of the pads 4a, 4b is supported axially movably with respect to the inner body 6 and the outer body 7 by engaging the ears 37 with the guide grooves 22 so as to be axially movably, and by engaging the pins 21 with the insertion holes 39 so as to be axially movably. Note that various conventionally known structures may be adopted as the support structure for the pair of pads with respect to the caliper.

[0103] A shim plate 40 made of a metal plate such as a stainless steel plate is attached to the rear side of the pressure plate 36 so as to cover the rear surface of the pressure plate 36 .

[0104] The opposed piston type disc brake device 1 of this example further includes a pair of pad springs 41a, 41b. The pad springs 41a, 41b press the pads 4a, 4b radially inward to prevent rattling of the pads 4a, 4b when not braking.

[0105] During braking by the opposed piston type disc brake device 1 of this embodiment, brake oil is sent from the master cylinder to the inner oil hole 13 through a brake hose (not shown) connected to the connection port 14 of the inner body 6. This pushes the inner piston 12 axially out of the inner cylinder 11, and presses the pad 4a supported by the inner body 6 against the axially inner surface of the rotor 5. Also, brake oil is sent from the inner oil hole 13 to the outer oil hole 17 through the communication pipe 3. This pushes the outer piston 16 axially out of the outer cylinder 15, and presses the pad 4b supported by the outer body 7 against the axially outer surface of the rotor 5. As a result, the rotor 5 is tightly sandwiched from both axial sides by the pair of pads 4a, 4b, and the vehicle is braked.

[0106] According to the opposed piston type disc brake device 1 of this example as described above, while preventing the communicating pipe 3 from floating up relative to the caliper 2, the efficiency of assembly work can be improved compared to conventional structures, and excessive tensile stress can be prevented from being applied to the connection between the communicating pipe 3 and the caliper 2.

[0107] That is, in this example as well, the covering tube 28 made of an elastic material is brought into contact with the caliper 2 with a tightening margin, so that the communicating tube 3 can be prevented from floating up from the caliper 2 and a gap can be prevented from occurring between the covering tube 28 and the caliper 2. This makes it possible to prevent the unpainted portion of the surface of the caliper 2 that is covered by the covering tube 28 from being exposed, and also to prevent the communicating tube 3 from interfering with the wheels arranged around the opposed piston type disc brake device 1.

[0108] Particularly in this example, covering tube 28 does not have a tightening margin in the central axis direction of flare nuts 27a, 27b. In this example, covering tube 28 is not pressed against caliper 2 in the central axis direction of flare nuts 27a, 27b, but is pressed only radially outwardly, approximately perpendicular to the central axis direction of flare nuts 27a, 27b, against contact surface 24 of caliper 2. This allows covering tube 28 to have only a radial tightening margin, and does not have a tightening margin in the central axis direction (circumferential direction) of flare nuts 27a, 27b.

[0109] 19, when the entire communicating pipe 3 is moved in one circumferential direction to screw-connect the flare nuts 27a, 27b to the inner body 6 and the outer body 7, there is no need to increase the amount of elastic deformation of the covering tube 28 relative to the contact surface 24. Therefore, there is no need to increase the tightening torque when screwing-connecting the flare nuts 27a, 27b. As a result, according to the opposed piston type disc brake device 1 of this embodiment, the efficiency of the assembly work can be improved compared to the conventional structure.

[0110] In this embodiment, the contact surface 24 is aligned with the central axis O of the flare nuts 27a and 27b. a , O b Since the covering tube 28 is disposed approximately parallel to the contact surface 24, the amount of elastic deformation of the covering tube 28 relative to the contact surface 24 when the communicating tube 3 is moved to one side in the circumferential direction can be kept constant. This makes it possible to effectively prevent the tightening torque of the flare nuts 27a, 27b from increasing.

[0111] In addition, in this example, when connecting the communicating pipe 3, the covering tube 28 can be moved in any direction except the radially outward direction without being restricted by the caliper 2. Therefore, even if there is dimensional variation in the pipe body 26, the variation can be absorbed by moving the covering tube 28. Therefore, from this point of view as well, the efficiency of the assembly work of the opposed piston type disc brake device 1 can be improved.

[0112] In addition, in this embodiment, the covering tube 28 has only a radial tightening margin, and does not have a tightening margin in the central axis direction of the flare nuts 27a, 27b, so that the tensile stress applied to the connection part between the communicating tube 3 and the caliper 2 can be reduced compared to the conventional structure. Therefore, it is possible to prevent the seal surface 32 provided at the end of the pipe body 26 from being separated from the pressed surface 19, and a gap from being generated between the seal surface 32 and the pressed surface 19. This ensures the sealing performance of the connection part between the communicating tube 3 and the caliper 2. As a result, the opposed piston type disc brake device 1 of this embodiment can reduce the defect rate. Also, even if the tightening margin of the covering tube 28 with respect to the contact surface 24 is increased, the tensile stress applied to the connection part between the communicating tube 3 and the caliper 2 is not affected, so by increasing the tightening margin, the effect of preventing the communicating tube 3 from floating up can be improved.

[0113] Furthermore, in this example, the covering tube 28 is pressed radially outward against the contact surface 24 provided on the outlet side connecting portion 9, so that the outlet side connecting portion 9 can prevent the axial extension portion 29 from floating radially outward due to vibrations, etc. applied when the vehicle is traveling, thereby effectively preventing interference between the communicating pipe 3 and the wheel.

[0114] Also, in this example, only the axial middle portion of the covering tube 28 is in contact with the contact surface 24, and not the entire axial direction of the covering tube 28. This makes it possible to reduce the range of the pipe body 26 where movement relative to the caliper 2 is restricted due to contact with the caliper 2, making it easier to deform the pipe body 26. Therefore, even if the pipe body 26 has dimensional variations, it is possible to prevent the ease of connecting the communicating pipe 3 from decreasing.

[0115] [Second Example of the Implementation Form] The second embodiment will be described with reference to FIGS.

[0116] The opposed piston type disc brake device 1a of this embodiment differs from the first embodiment in the manner in which the covering tube 28 contacts the caliper 2a.

[0117] The caliper 2a in this example has a protruding portion 42 that protrudes in the circumferential direction at the radially inner end of one circumferential end of the turn-in side connecting portion 8a. In the illustrated example, the caliper 2a has the protruding portion 42 not only at the turn-in side connecting portion 8a but also at the turn-out side connecting portion 9a.

[0118] The protruding portion 42 has a contact surface 24a on its radially outer surface. The contact surface 24a is flat and faces radially outward. The contact surface 24a is aligned with the central axis O of the flare nuts 27a and 27b that constitute the communicating pipe 3. a , O b are arranged approximately parallel to each other.

[0119] The contact surface 24a has a generally rectangular shape with an axial width greater than a circumferential width.

[0120] In the opposed piston type disc brake device 1a of this example, the communicating pipe 3 connects one circumferential end of each of the inner-side oil hole 13 provided in the inner body 6 and the outer-side oil hole 17 provided in the outer body 7. The other circumferential end of each of the inner-side oil hole 13 and the outer-side oil hole 17 is blocked by a bleeder screw 20.

[0121] The communication pipe 3 is disposed around the caliper 2a so as to cover one circumferential side of the caliper 2a from one circumferential side.

[0122] In this example, the covering tube 28 constituting the communicating pipe 3 does not have a tightening margin in the central axis direction (circumferential direction) of the flare nuts 27a, 27b relative to the caliper 2a when one flare nut 27a is screwed and connected to the inner body 6 and the other flare nut 27b is screwed and connected to the outer body 7. The covering tube 28 is pressed against the caliper 2a only in one predetermined direction other than the central axis direction of the flare nuts 27a, 27b.

[0123] Specifically, the covering tube 28 contacts only the contact surface 24a of the caliper 2a facing radially outward, which is provided on the rotation-in side connecting portion 8a, and is pressed against the contact surface 24a toward the radially inner side (the lower side in Figs. 25 and 27(A), the back side in Fig. 26(A)) that is substantially perpendicular to the central axis direction of the flare nuts 27a, 27b. Therefore, the covering tube 28 is pressed against the caliper 2a only toward the radially inner side, and is in contact with the caliper 2a with only a radial interference. Therefore, the covering tube 28 does not have a circumferential interference that substantially coincides with the central axis direction of the flare nuts 27a, 27b with respect to the caliper 2a. A gap 34a is provided between the covering tube 28 and the caliper 2a in the central axis direction of the flare nuts 27a, 27b.

[0124] Only the radially inner portion of the covering tube 28 that is in contact with the contact surface 24a is elastically deformed. In this example, since the axial dimension of the covering tube 28 is smaller than the axial width of the contact surface 24a, the entire axial portion of the covering tube 28 is in contact with the contact surface 24a and is elastically deformed.

[0125] In the above-described embodiment, the covering tube 28 is not pressed against the caliper 2a in the central axis direction of the flare nuts 27a, 27b, but is pressed against the contact surface 24a of the caliper 2a only in the radially inward direction substantially perpendicular to the central axis direction of the flare nuts 27a, 27b. This allows the covering tube 28 to have only a radial tightening margin, and does not allow the covering tube 28 to have a tightening margin in the central axis direction (circumferential direction) of the flare nuts 27a, 27b.

[0126] 31, when the entire communicating pipe 3 is moved to the other circumferential side to screw-connect the flare nuts 27a, 27b to the inner body 6 and the outer body 7, the amount of elastic deformation of the covering tube 28 with respect to the contact surface 24a does not need to be increased. Therefore, the tightening torque when screwing-connecting the flare nuts 27a, 27b does not need to be increased. Also, since the covering tube 28 has only a radial tightening margin and does not have a tightening margin in the central axis direction of the flare nuts 27a, 27b, the tensile stress applied to the connection between the communicating pipe 3 and the caliper 2a can be reduced compared to the conventional structure.

[0127] Also in this embodiment, the contact surface 24a is aligned with the central axis O of the flare nuts 27a and 27b. a , O b Since the covering tube 28 is disposed approximately parallel to the contact surface 24a, the amount of elastic deformation of the covering tube 28 with respect to the contact surface 24a when the communicating tube 3 is moved to the other circumferential direction can be made constant.

[0128] Furthermore, when connecting the communicating pipe 3, the covering tube 28 can be moved in any direction except the radially inward direction without being restricted by the caliper 2a. Therefore, even if there is dimensional variation in the pipe body 26, the variation can be absorbed by moving the covering tube 28. Therefore, from this point of view as well, the efficiency of the assembly work of the opposed piston type disc brake device 1a can be improved. The other configurations and effects are the same as those of the first embodiment.

[0129] [Third Example of the Implementation Form] The third embodiment will be described with reference to FIGS.

[0130] An opposed-piston type disc brake device 1b of this embodiment differs from the first embodiment in the manner in which the covering tube 28 contacts the caliper 2b.

[0131] Caliper 2b has a surface 43 facing radially inward at an axially intermediate portion of the end portion on the other circumferential side of rotation-side connecting portion 9b. A protrusion 44 protruding radially inward, which is a direction perpendicular to the central axis direction of flare nuts 27a, 27b, is provided at an axially intermediate portion of surface 43. In the illustrated example, surface 43 is configured to have a flat shape, and only one protrusion 44 is provided on surface 43. However, the surface may be configured from a surface other than a flat surface, and multiple protrusions may be provided.

[0132] In the illustrated example, the protrusion 44 has a triangular prism shape and extends in the circumferential direction. The axial width of the protrusion 44 decreases toward the radially inner side. The shape of the protrusion is not limited to a triangular prism shape, and may be a square prism shape, a cylindrical shape (including a semi-cylindrical shape), or the like.

[0133] In the illustrated example, the radial protrusion amount of the protrusion 44 is constant in the circumferential direction and is smaller than the thickness of the covering tube 28. However, the protrusion amount of the protrusion 44 may be varied in the circumferential direction, for example, by making it larger toward one circumferential side.

[0134] As shown in FIG. 32, the protrusion 44 is aligned with the central axis O of each of the pair of flare nuts 27a, 27b that constitute the communication pipe 3. a , O b In the imaginary plane α including the center axis O of each of the pair of flare nuts 27a, 27b, a , O b The distances (X1, X2) to the object are equal to each other, and the object is disposed on an orthogonal plane β that passes through the position (Y) and is orthogonal to the virtual plane α.

[0135] In this example, the covering tube 28 contacts a protrusion 44 provided on the rotation-side connecting portion 9b of the caliper 2b, and is pressed against the protrusion 44 radially outward (upper side in Figs. 32 and 35) substantially perpendicular to the central axis direction of the flare nuts 27a, 27b. Therefore, the covering tube 28 is pressed against the caliper 2b only radially outward, and is in contact with the caliper 2b with only a radial interference. Therefore, the covering tube 28 does not have a circumferential interference that substantially coincides with the central axis direction of the flare nuts 27a, 27b.

[0136] In this example, the covering tube 28 is pressed against and in contact with only the protrusion 44. However, both axial sides of the portion of the covering tube 28 that is in contact with the protrusion 44 can also be brought into contact with the surface 43 (pressed radially outward).

[0137] In the above-described embodiment, since the covering tube 28 is pressed against the protrusion 44 of the caliper 2b, the surface pressure on the caliper 2b can be increased compared to when the covering tube 28 is pressed against a flat surface. This allows the amount of elastic deformation of the covering tube 28 to be increased, and the tightening margin of the covering tube 28 against the caliper 2b to be increased. Therefore, even if there is dimensional variation in the pipe body 26 of the communicating tube 3, it becomes possible to press the covering tube 28 against the caliper 2b with a sufficiently large force, and the covering tube 28 can be effectively prevented from floating up from the caliper 2b.

[0138] In addition, in this example, since the protrusions 44 are disposed on the orthogonal plane β, the dimensions (X1, X2) of the portions of the pipe body 26 on both axial sides of the protrusions 44 can be made sufficiently long. Therefore, the portions of the pipe body 26 on both axial sides of the protrusions 44 can be easily deformed, so that even if the pipe body 26 has dimensional variations, the workability of connecting the communicating pipe 3 can be prevented from decreasing.

[0139] In this example, a case has been described in which a protrusion 44 protruding radially inward is provided, but as in the modified example shown in Figure 36, the covering tube 28 can also be pressed radially inward against the protrusion 44 protruding radially outward.

[0140] [Fourth Example of the Implementation Form] The fourth embodiment will be described with reference to FIGS.

[0141] In the opposed piston type disc brake device 1c of this embodiment, the contact mode of the covering tube 28a with the caliper 2 is different from that of the first embodiment.

[0142] Similar to the structure of the first example of the embodiment, the caliper 2 in this example has a planar contact surface 24 facing radially inward at the axial middle portion of the other circumferential end of the output side connecting portion 9.

[0143] In this example, the covering tube 28a constituting the communication pipe 3a is composed of a tube body 45 having a cylindrical shape and a protrusion 46.

[0144] The cylindrical main body 45 covers an axially intermediate portion of the axially extending portion 29 that constitutes the pipe main body 26 .

[0145] The protrusion 46 is provided at one location in the circumferential direction at the axially intermediate portion of the outer peripheral surface of the tubular body 45. In this example, the protrusion 46 is provided at the radially outer end of the outer peripheral surface of the tubular body 45. In other words, the protrusion 46 protrudes from the outer peripheral surface of the tubular body 45 toward the radially outer side, which is a direction perpendicular to the central axis direction of the flare nuts 27a, 27b. In the illustrated example, only one protrusion 46 is provided at the axially intermediate portion of the outer peripheral surface of the tubular body 45, but multiple protrusions may be provided.

[0146] In the illustrated example, the protrusion 46 has a square prism shape. Note that the shape of the protrusion is not limited to a square prism shape, and it is also possible to adopt a triangular prism shape, a pyramid shape, a cylindrical shape (including a semi-cylinder shape), a cone shape, a hemisphere shape, etc.

[0147] In the illustrated example, the radial height of the protrusion 46 (the radial distance from an imaginary plane including the central axis of the covering tube 28a) is constant in the circumferential direction. However, the radial height of the protrusion 46 may be varied in the circumferential direction, for example, by increasing the radial height toward one circumferential side.

[0148] As shown in FIG. 37, the protrusion 46 is aligned with the central axis O of each of the pair of flare nuts 27a, 27b that constitute the communication pipe 3a. a , O b In the imaginary plane α including the center axis O of each of the pair of flare nuts 27a, 27b, a , O b The distances (X1, X2) to the object are equal to each other, and the object is disposed on an orthogonal plane β that passes through the position (Y) and is orthogonal to the virtual plane α.

[0149] In this example, the protrusion 46 of the covering tube 28a contacts the contact surface 24 provided on the rotation-side connecting portion 9, and is pressed against the contact surface 24 radially outward (upper side in Figs. 37 and 40) substantially perpendicular to the central axis direction of the flare nuts 27a, 27b. Therefore, the covering tube 28a is pressed against the caliper 2 only radially outward, and is in contact with the caliper 2 with only a radial tightening margin. Therefore, the covering tube 28a does not have a circumferential tightening margin with respect to the caliper 2 that substantially coincides with the central axis direction of the flare nuts 27a, 27b.

[0150] In this example, only the protrusion 46 of the covering tube 28a contacts the contact surface 24, and the portion of the outer circumferential surface of the tube body 45 that is not aligned with the protrusion 46 does not contact the contact surface 24. However, the portions of the outer circumferential surface of the tube body 45 that are on both axial sides of the protrusion 46 can also be brought into contact with the contact surface 24 (pressed radially outward).

[0151] In the above-described embodiment, the projection 46 of the covering tube 28a is pressed against the contact surface 24 of the caliper 2, so that the surface pressure on the caliper 2 can be increased compared to the case where the cylindrical outer peripheral surface is pressed against the flat contact surface. This allows the covering tube 28a to be largely elastically deformed, and the tightening margin of the covering tube 28a with respect to the caliper 2 can be increased. Therefore, even if there is dimensional variation in the pipe body 26 of the communicating tube 3a, it is possible to press the covering tube 28a against the caliper 2 with a sufficiently large force, and the covering tube 28a can be effectively prevented from floating up from the caliper 2.

[0152] In addition, in this example, since the protrusion 46 is disposed on the orthogonal plane β, the dimensions (X1, X2) of the portions of the pipe body 26 on both axial sides of the protrusion 46 can be made sufficiently long. Therefore, the portions of the pipe body 26 on both axial sides of the protrusion 46 can be easily deformed, so that even if the pipe body 26 has dimensional variations, the workability of connecting the communicating pipe 3a can be prevented from decreasing. The other configurations and effects are the same as those of the structures of the first and third examples of the embodiment.

[0153] In this example, the protrusion 46 provided on the outer peripheral surface of the covering tube 28a is pressed against the contact surface 24 facing radially inward, but as in the modified example shown in Figure 41, the protrusion 46 provided on the outer peripheral surface of the covering tube 28a can also be pressed radially inward against the contact surface 24 facing radially outward.

[0154] Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be modified as appropriate without departing from the technical concept of the invention. Furthermore, the structures of the examples of the embodiment can be combined as appropriate as long as no contradiction occurs.

[0155] The technical concept of the present invention is not limited to a structure in which the central axes of a pair of flare nuts that constitute a communicating pipe are arranged in the circumferential direction of the rotor, but can also be applied to a structure in which the central axes are arranged in other directions, such as the radial direction of the rotor.

[0156] When implementing the present invention, the number and arrangement of the inner cylinders and outer cylinders are not limited to the structures of the examples of the embodiments, and can be changed as appropriate. [Explanation of symbols]

[0157] 1, 1a, 1b, 1c Opposed piston type disc brake device 2, 2a, 2b Caliper 3, 3a communication pipe 4a, 4b pads 5 Rotor 6 Inner Body 7 Outer Body 8, 8a Inlet side connection part 9, 9a, 9b Retraction side connection part 10 Intermediate connection 11 Inner cylinder 12 Inner piston 13 Inner oil passage 14 Connection port 15 Outer cylinder 16 Outer piston 17 Outer oil passage 18 Female thread 19 Pressed surface 20 Bleeder screw 21 pin 22 Guide groove 23 Guide wall 24, 24a contact surface 25a, 25b sloped surface 26 Pipe body 27a, 27b flare nut 28, 28a Covered tube 29 Axial extension section 30a, 30b Circumferential extension part 31 Bend 32 Sealing surface 33 Male thread 34, 34a Gap 35 Lining 36 Pressure Plate 37 Ears 38 Overhang plate part 39 Insertion hole 40 Shim plate 41a, 41b Pad spring 42 Overhang 43 sides 44 Protrusion 45 Cylinder body 46 Protrusion 100 Opposed piston type disc brake device 101 Rotor 102 Caliper 103a, 103b Pads 104 Inner Body 105 Outer Body 106 Inner Cylinder 107 Inner Piston 108 Outer Cylinder 109 Outer piston 110 Communication pipe 111 Bleeder screw 112 Turn entry side connection part 113 Output side connection part 114 Intermediate connection 115 Pipe body 116a, 116b flare nut 117 Covered tube 118 1st contact surface 119 Second contact surface

Claims

1. a caliper including an inner body having an inner cylinder and an outer body having an outer cylinder; a communication pipe disposed around the caliper and connecting the inner cylinder and the outer cylinder, the communicating pipe includes a pipe body, a pair of flare nuts that are provided at both ends of the pipe body so as to be rotatable relative to the pipe body with their respective central axes disposed approximately parallel to each other, and that are screw-connected to the inner body and the outer body, respectively, and a covering tube made of an elastic material that covers a portion of the pipe body and is in contact with the caliper with a tightening margin; The covering tube does not have a tightening margin in a central axis direction of the flare nut with respect to the caliper. Opposed piston type disc brake device.

2. 2. The opposed-piston type disc brake device according to claim 1, wherein a gap is provided between the covering tube and the caliper in the direction of a central axis of the flare nut.

3. 2. The opposed-piston type disc brake device according to claim 1, wherein the covering tube is pressed against the caliper only in one predetermined direction other than the direction of a central axis of the flare nut.

4. 4. The opposed-piston type disc brake device according to claim 3, wherein the covering tube is pressed against the caliper in a direction substantially perpendicular to a central axis of the flare nut.

5. The central axis direction of the flare nut is substantially aligned with the circumferential direction, The covering tube is pressed against a surface of the caliper facing radially outward.

5. An opposed piston type disc brake device according to claim 4.

6. The central axis direction of the flare nut is substantially aligned with the circumferential direction, The covering tube is pressed against a surface of the caliper facing radially inward.

5. An opposed piston type disc brake device according to claim 4.

7. the caliper further includes a connecting portion that connects a circumferential end portion of the inner body and a circumferential end portion of the outer body, The covering tube is pressed against the connecting portion.

2. An opposed piston type disc brake device according to claim 1.

8. 2. The opposed-piston type disc brake device according to claim 1, wherein a surface of said caliper with which said covering tube comes into contact with said caliper with an interference is a flat surface.

9. 9. The opposed-piston type disc brake device according to claim 8, wherein a central axis of each of the pair of flare nuts and a surface of the caliper with which the covering tube comes into contact with the caliper with an interference are disposed approximately parallel to each other.

10. 2. The opposed piston type disc brake device according to claim 1, wherein the caliper has a protrusion at a portion that comes into contact with the covering tube.

11. 2. The opposed piston type disc brake device according to claim 1, wherein the covering tube has a protrusion at a portion that comes into contact with the caliper.

12. 12. The opposed-piston disc brake device according to claim 10, wherein the protrusion protrudes in a direction substantially perpendicular to a central axis of the flare nut.

13. 12. The opposed-piston disc brake device according to claim 10 or 11, wherein the protrusions are disposed on an orthogonal plane that passes through positions that are equidistant to the central axes of the pair of flare nuts and is orthogonal to the imaginary plane including the central axes of the pair of flare nuts.

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