Disc brakes

Abstract

The present invention is an improvement of a disc brake having a first pressing member and a second pressing member, for example, to make the movement of a driving member that moves in the axial direction accompanying the movement of the second pressing member smooth. In the disc brake, the second housing portion extending from the first housing portion to the outside of the rotor includes a pair of rod portions that are spaced apart in the circumferential direction and extend in the axial direction, and a pair of guide rail portions respectively provided on the pair of rod portions can hold the outer brake pad so as to be relatively movable in the axial direction, and a torque bearing portion that bears the torque acting on the outer brake pad when the disc brake is working is provided on the pair of guide rail portions. In this way, since the torque bearing portion is provided on the second housing portion, the circumferential force acting on the driving member can be suppressed, and the movement of the driving member in the axial direction can be made smooth accordingly.

Description

Technical Field

[0001] The present invention relates to a disc brake mounted on a wheel of a vehicle. Background Art

[0002] Patent document 1 describes a floating disc brake, which includes: (a) an inner brake pad and an outer brake pad, which are positioned by clamping a rotor that rotates together with the wheel; (b) a pressing device that presses the inner brake pad and the outer brake pad against the rotor; and (c) a housing that is mounted on a non-rotating body and holds the pressing device. The pressing device includes (i) a first pressing member that is held in the housing and can move toward the rotor and a second pressing member that can move in a direction away from the rotor, and (ii) a brake caliper that is held in the housing and can move relative to the direction parallel to the rotation axis of the rotor and moves with the movement of the second pressing member. In addition, the brake caliper is held in the housing via a pin that extends in a direction parallel to the rotation axis, but the central axis of the pin is not in the same plane as the central axis of the first pressing member and the second pressing member.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-020644 Summary of the invention

[0004] An object of the present invention is to improve a disk brake including a first pressing member and a second pressing member, for example, to smooth the operation of a driving member that moves in the axial direction as the second pressing member moves.

[0005] In the disc brake involved in the present invention, the housing includes a first housing portion located on the inner side of the rotor, and a second housing portion extending from the first housing portion to the outer side of the rotor, the second housing portion includes a pair of rod portions spaced apart in the circumferential direction and extending in the axial direction, a pair of guide rail portions respectively provided on the pair of rod portions can hold the outer brake pad so as to be relatively movable in the axial direction, and a torque bearing portion that bears the torque acting on the outer brake pad when the disc brake is working is provided on the pair of guide rail portions. In this way, the torque bearing portion is not provided on the driving component but is provided on the second housing portion. As a result, the circumferential force acting on the driving component can be suppressed, and the axial movement of the driving component can be made smooth accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a perspective view of a disc brake according to an embodiment of the present invention.

[0007] Figure 2 It is a side view of the above-mentioned disc brake.

[0008] Figure 3 is a rear view of the above-mentioned disc brake.

[0009] Figure 4 The above disc brake Figure 6 IV-IV cross-sectional view.

[0010] Figure 5 is a cross-sectional view of the above-mentioned disc brake.

[0011] Figure 6 It is a figure which shows the periphery of the inner brake pad of the said disc brake.

[0012] Figure 7 The above disc brake Figure 6 VII-VII sectional view.

[0013] Figure 8 The above disc brake Figure 4 VIII-VIII sectional view of the invention.

[0014] Description of Reference Numerals

[0015] 3…rotor; 4…inner brake pad; 6…outer brake pad; 8…pressing device; 10…housing; 14…brake cylinder; 16…frame; 18…first housing portion; 19…second housing portion; 24…cylinder bore; 30…first piston; 32…second piston; 46, 48…pin retaining hole; 54…first side portion; 55…second side portion; 55t…outer portion; 60, 62…pin; 80, 81…rod portion; 90, 91…guide portion; 90f, 91f…torque bearing portion; 100…leaf spring. DETAILED DESCRIPTION

[0016] Hereinafter, a disk brake provided on a wheel of a vehicle as one embodiment of the present invention will be described with reference to the drawings. The disk brake may be operated by hydraulic pressure or by electromagnetic driving force.

[0017] [Example]

[0018] The disc brake according to the present embodiment is a floating disc brake that is operated by hydraulic pressure.

[0019] like Figures 1 to 5 As shown in FIG. 1 , the disc brake includes a rotor 3 that rotates together with the wheel, an inner brake pad 4 and an outer brake pad 6 located on both sides of the rotor 3, a pressing device 8, and a housing 10 that holds the pressing device 8. The pressing device 8 includes a brake cylinder 14 and a frame 16 as a driving member. Hereinafter, there is a case where the direction parallel to the rotation axis L of the rotor 3 is simply referred to as the axial direction. In addition, in the axial direction, the side where the outer brake pad 6 is located is the outer side of the vehicle, and the side where the inner brake pad 4 is located is the inner side of the vehicle.

[0020] In addition, the inner brake pad 4 and the outer brake pad 6 respectively include back plates 4r and 6r and brake pad portions 4p and 6p as friction engagement portions held by the back plates 4r and 6r. In the inner brake pad 4 and the outer brake pad 6, the brake pad portions 4p and 6p are opposed to the rotor 3, respectively.

[0021] like Figure 7 , 8 As shown, convex parts 4a, 4b, 6a, 6b protruding outward in the radial direction are provided at the circumferentially spaced parts along the respective outer peripheries of the back plates 4r, 6r. The convex parts 4a, 4b, 6a, 6b have claw parts 4at, 4bt, 6at, 6bt protruding outward in the circumferential direction, respectively. In other words, concave parts 4ax, 4bx, 6ax, 6bx recessed in the circumferential direction are provided at the base parts in the radial direction on the outer sides of the convex parts 4a, 4b, 6a, 6b, and the radially outer parts of the concave parts 4ax, 4bx, 6ax, 6bx of the convex parts 4a, 4b, 6a, 6b are claw parts 4at, 4bt, 6at, 6bt. In addition, convex parts 4c, 6c protruding in the radial direction are provided at the middle parts of the respective outer peripheries of the back plates 4r, 6r. The tops of the convex parts 4c, 6c are almost flat.

[0022] like Figure 1 , 6 As shown, the housing 10 includes a first housing portion 18 located on the inner side of the vehicle than the rotor 3 , and a second housing portion 19 fixed to the first housing portion 18 and extending from the inner side of the rotor 3 to the outer side across the rotor 3 .

[0023] The first housing portion 18 extends substantially in the axial direction. Figure 4 , 5 As shown in FIG. 1 , a cylinder bore 24 is provided inside the first housing portion 18 and penetrates the first housing portion 18 in the axial direction. Figure 2 As shown, the central axis C of the cylinder bore 24 is parallel to the rotation axis L of the rotor 3. In the cylinder bore 24, the first piston 30 as the first pressing member and the second piston 32 as the second pressing member are respectively fitted in a liquid-tight and slidable manner via piston seals. The portion between the first piston 30 and the second piston 32 of the cylinder bore 24 is a hydraulic chamber 36, and the first piston 30 and the second piston 32 can move relative to each other in the axial direction.

[0024] In this embodiment, the portion of the cylinder bore 24 formed with the first housing portion 18 is the cylinder body, and the cylinder body, the first piston 30, the second piston 32, etc. constitute the brake cylinder 14. In addition, the center axes of the first piston 30 and the second piston 32 are almost consistent with the center axis C of the cylinder bore 24.

[0025] like Figure 1 , 3As shown, a pair of mounted portions 42, 44 are provided on both sides of the circumferential direction of the rotor-side end portion of the first housing portion 18 in the axial direction. The housing 10 is fixed to a suspension member (also referred to as a vehicle body member) such as a steering knuckle as a non-rotating body at the pair of mounted portions 42, 44.

[0026] like Figure 5 As shown in FIG. 1 , a pair of pin retaining holes 46 and 48 extending parallel to the axial direction are respectively provided on both sides of the cylinder bore 24 in the circumferential direction of the first housing portion 18. The center axis Cp of each of the pin retaining holes 46 and 48 is parallel to the center axis C of the cylinder bore 24, and as shown in FIG. Figure 3 As shown in FIG. 1 , the two disk brakes are located almost on the same plane N. In addition, when the disk brake is viewed from the side, Figure 2 , 4 As shown, the center axis C of the cylinder bore 24 and the center axis Cp of the pin retaining holes 46 , 48 are located at almost the same position.

[0027] In contrast, Figure 1 , 5 As shown in 6, the frame 16 is a rigid body formed in a substantially frame shape, and is held by the first housing portion 18 so as to be relatively movable in the axial direction.

[0028] The frame 16 includes (i) a first side portion 54 and a second side portion 55 which are spaced apart from each other in the axial direction, and (ii) a third side portion 57 and a fourth side portion 58 which connect the first side portion 54 and the second side portion 55 and are spaced apart from each other in the circumferential direction. In the present embodiment, the first side portion 54 and the second side portion 55 extend in directions substantially orthogonal to the axial direction, and the third side portion 57 and the fourth side portion 58 extend in directions intersecting the first side portion 54 and the second side portion 55, respectively.

[0029] The first side 54 and the second side 55 are located on opposite sides of the rotor 3 in the axial direction. The first side 54 is located on the inner side of the vehicle than the rotor 3 and faces the second piston 32. The second side 55 is located on the outer side of the vehicle than the rotor 3 and engages with the outer brake pad 6. Figure 5 As shown, the outer brake pad 6 is engaged with the second side portion 55 so as to be integrally movable in the axial direction, but is engaged with a gap s in the circumferential direction.

[0030] The third side 57 and the fourth side 58 are respectively extended toward the inner side and the outer side of the vehicle of the rotor 3. Figure 5 , 7 As shown in FIG. 8 , the inner brake pad 4 and the outer brake pad 6 are not provided beyond the radial outer sides thereof but beyond the rotor 3 .

[0031] like Figure 1 , 3As shown in Figures 5, 6, 7, etc., the frame 16 is formed in a symmetrical shape relative to a symmetry plane Q extending in the axial direction, and the plane N is almost orthogonal to the symmetry plane Q.

[0032] In addition, the symmetry plane Q of the frame 16 does not necessarily pass through the central axis C of the cylinder bore 24. The symmetry plane Q may pass through the central axis C or may not pass through the central axis C. On the other hand, it can be considered that the plane N is substantially orthogonal to the plane including the central axis C of the cylinder bore 24 (the same as the central axis of the first piston 30 and the central axis of the second piston 32) and the rotation axis L.

[0033] In addition, if Figure 3 , 5 As shown, a pair of pins 60, 62 extending in the axial direction are mounted at positions symmetrical to the symmetry plane Q of the first side portion 54 of the frame 16, in other words, at positions equidistant (z=z) from the symmetry plane Q in a state of protruding toward the rotor 3. The pins 60, 62 are provided at positions opposing the pair of pin holding holes 46, 48 formed in the first housing portion 18 so as to be relatively movable relative to the pin holding holes 46, 48. In other words, the frame 16 is held in the housing 10 in a posture in which the center axes Cy of the pins 60, 62 are substantially aligned with the center axes Cp of the pin holding holes 46, 48. The frame 16 is held in the housing 10 via the pins 60, 62 so as to be relatively movable in the axial direction.

[0034] When the frame 16 is mounted on the housing 10, the center axis C of the cylinder bore 24 (also the center axis of the first piston 30 and the second piston 32) and the center axis Cy of the pins 60 and 62 are located on almost the same plane N. In this specification, "located on the same plane N" means "almost" or "actually" located on the same plane N. The same also applies to "being (located) at the same position" and "orthogonal", which means "almost" or "actually" being (located) at the same position and "almost" or "actually" being orthogonal.

[0035] In addition, the pins 60 and 62 include first pin portions 70a and 70b and second pin portions 72a and 72b, respectively. The first pin portions 70a and 70b are located on the frame 16 side, and the second pin portions 72a and 72b are connected to the portions of the first pin portions 70a and 70b protruding from the frame 16, respectively. The first pin portions 70a and 70b and the second pin portions 72a and 72b can move in the axial direction integrally with the frame 16.

[0036] In addition, in the top-down perspective, Figure 5 , 6As shown, the average axial length y1 of the first side 54 is longer than the average axial length y2 of the second side 55 (y1>y2). When the required rigidity with respect to the force in the axial direction is obtained mainly by the first side 54, the second side 55 can be made thinner. In addition, the outer side of the vehicle, that is, the space on the side where the second side 55 is located is relatively limited. Therefore, in particular, when the disc brake is installed on a wheel with an in-wheel motor, it is effective to make the second side 55 thinner.

[0037] In order to hold the frame 16 to the housing 10 via the pair of pins 60 and 62 , it is preferable that the length y1 of the first side portion 54 is long.

[0038] For example, the length y2 of the second side 55 can be shorter than 2 / 3 (y2<2×y1 / 3) of the length y1 of the first side 54. In addition, the length y2 of the second side 55 can be shorter than 1 / 2 (y2<y1 / 2), shorter than 1 / 3 (y2<y1 / 3), shorter than 1 / 4 (y2<y1 / 4), shorter than 1 / 5 (y2<y1 / 5), etc. of the length y1 of the first side 54.

[0039] In addition, if Figure 4 As shown in FIG. 1 , the second side portion 55 is formed into a cross-sectional shape in which the radial length of the outer side portion 55t is longer and the radial length of the inner side portion 55i is shorter. Therefore, compared with the case where the cross-sectional area is the same and the cross-sectional shape is formed into a substantially rectangular shape, the bending rigidity with respect to the force in the axial direction applied when the disc brake is in operation can be increased. In other words, by making the cross-sectional shape a shape with greater bending rigidity, the length y2 of the axial direction of the second side portion 55 can be reduced accordingly. In addition, by making the radial length of the outer side portion 55t longer than that of the inner side portion 55i, it is possible to add a logo or the like to the outer side surface of the outer side portion 55t to improve the appearance design.

[0040] Furthermore, since the frame 16 is held by the housing 10 at the first side 54 via the pair of pins 60 and 61 , the frame 16 can be easily processed compared to the case where the frame 16 is held by the third side 57 and the fourth side 58 .

[0041] like Figure 1 , 6 As shown in FIG. 1 , the second housing portion 19 includes: a pair of rod portions 80, 82, which are generally frame-shaped in a plan view, are spaced apart in the circumferential direction, and extend in the axial direction; and connecting portions 83, 84, which connect the pair of rod portions 80, 82 and generally extend in the circumferential direction. Figure 7 , 8 As shown, the inner brake pad 4 and the outer brake pad 6 are respectively held by a pair of rod portions 80 and 82 so as to be movable in the axial direction.

[0042] In this embodiment, the pair of rods 80, 82 respectively have a pair of convex rail portions 90, 91 that are provided to protrude toward the mutually opposite sides and extend in the axial direction, and the outer brake pad 6 and the inner brake pad 4 are held at the claw portions 4at, 4bt, 6at, 6bt by the pair of convex rail portions (hereinafter, sometimes referred to as rail portions) 90, 91. For example, a notch extending in the axial direction is formed at the outer peripheral side of the mutually opposite sides of the rods 80, 82, and the pair of rail portions 90, 91 are formed in a shape formed at the inner peripheral side of the notch.

[0043] In addition, when the outer brake pad 6 and the inner brake pad 4 are held by the claws 4at, 4bt, 6at, 6bt on the pair of rails 90, 91, respectively, there is a small gap between the bottom surface of the recessed portions 6ax, 6bx, 4ax, 4bx and the facing surfaces 90f, 91f of the rails 90, 91. The facing surfaces 90f, 91f of the rails 90, 91 function as torque receiving portions.

[0044] In this embodiment, a leaf spring 100 is provided as an elastic member to hold the inner brake pad 4 and the outer brake pad 6 in the radial direction and in the circumferential direction. Figure 1 , 6 As shown, the leaf spring 100 suppresses the vibration of the outer brake pad 6 and the inner brake pad 4 in the radial direction and the circumferential direction. The leaf spring 100 includes a middle portion 102 located in the middle of the axial direction, an inner brake pad retaining portion 104 located on the inner side of the vehicle of the middle portion 102, and an outer brake pad retaining portion 106 located on the outer side of the vehicle of the middle portion 102. These middle portion 102, the inner brake pad retaining portion 104, and the outer brake pad retaining portion 106 are connected to each other. The leaf spring 100 is retained by a pair of guide rail portions 90, 91 at the middle portion 102. In this embodiment, the inner brake pad 4 and the outer brake pad 6 are retained by one leaf spring 100, so the number of components can be reduced compared with the case based on two leaf springs.

[0045] like Figure 1 , 4 As shown in FIGS. 7 and 8, the inner brake pad retaining portion 104 is elastically engaged with the convex portion 4a of the back plate 4r of the inner brake pad 4 in the circumferential direction (dragging direction) and elastically engaged with the convex portion 4c from the radial outer side. Thus, the circumferential and radial vibrations of the inner brake pad 4 are suppressed. Similarly, the outer brake pad retaining portion 106 is elastically engaged with the convex portion 64a of the back plate 6r of the outer brake pad 6 in the circumferential direction (dragging direction) and elastically engaged with the convex portion 6c in the radial direction.

[0046] In this way, the leaf spring 100 holds the inner brake pad 4 and the outer brake pad 6 in the circumferential direction and the radial direction, and therefore the inner brake pad 4 and the outer brake pad 6 can be well held regardless of the mounting position of the disc brake relative to the wheel.

[0047] In addition, the leaf spring 100 holds the inner brake pad 4 and the outer brake pad 6 while applying elastic force in the circumferential direction (dragging direction). Therefore, when the disc brake is working, even if the pushing force (hydraulic pressure in this embodiment) pressing the inner brake pad 4 and the outer brake pad 6 is small, the circumferential vibration of the inner brake pad 4 and the outer brake pad 6 can be well suppressed.

[0048] In addition, when the inner brake pad 4 is held on the second housing portion 19, the inner brake pad 4 is inserted between the pair of rod portions 80 and 82 from the rotation axis L side of the rotor 3 while the pair of convex portions 4a and 4b of the back plate 4r are elastically deformed in a tilted posture. In addition, the inner peripheral side surfaces of the claw portions 4at and 4bt of the convex portions 4a and 4b are respectively abutted against the radial outer side surfaces 90h and 91h of the pair of guide rail portions 90 and 91. Thus, the inner brake pad 4 is held on the pair of guide rail portions 90 and 91 so that the claw portions 4at and 4bt can move in the axial direction. The same is true for the outer brake pad 6.

[0049] In this way, the inner brake pad 4 and the outer brake pad 6 are held on the pair of rods 80 and 81 by the pair of guide rails 90 and 91, so that the installation performance can be improved and the workability can be improved. That is, compared with the case where the pair of rods 80 and 81 are provided with recesses corresponding to the pair of protrusions 4a, 4b, 6a, 6b provided on the outer periphery of the inner brake pad 4 and the outer brake pad 6 and the protrusions 4a, 4b, 6a, 6b are engaged with the recesses to hold them, in this embodiment, the inner brake pad 4 and the outer brake pad 6 can be easily held on the pair of rods 80 and 81.

[0050] In addition, as long as the claws 4at, 4bt, 6at, 6bt of the inner brake pad 4 and the outer brake pad 6 are respectively engaged with the pair of rail portions 90, 91, high dimensional accuracy is not required for the pair of rail portions 90, 91 and the claws 4at, 4bt, 6at, 6bt. Thus, the manufacturing cost can be reduced.

[0051] The disc brake constructed as described above is operated by the hydraulic pressure of the hydraulic chamber 36 of the brake cylinder 14. A force corresponding to the hydraulic pressure of the hydraulic chamber 36 is applied to the first piston 30 and the second piston 32. The first piston 30 is moved in the axial direction toward the rotor 3, and the inner brake pad 4 is pressed against the rotor 3. The second piston 32 is moved in the axial direction in the direction away from the rotor 3, and the frame 16 is moved in the axial direction, and the outer brake pad 6 is pressed against the rotor 3. The inner brake pad 4 and the outer brake pad 6 press the rotor 3 from both sides to perform friction engagement. In this way, the disc brake is operated to suppress the rotation of the rotor 3 and the rotation of the wheel.

[0052] In addition, when the wheel is Figure 7 , 8 When the disc brake is operated by rotating in the direction indicated by the arrow X (hereinafter referred to as the rotation direction X), the torque in the rotation direction X acts on the inner brake pad 4 and the outer brake pad 6, and the circumferential force Fg acts on the center of gravity Gin and Gout of the inner brake pad 4 and the outer brake pad 6, respectively.

[0053] like Figure 7 As shown, the inner brake pad 4 is moved in the X direction, and the bottom of the recessed portion 4ax of the back plate 4r contacts the opposing surface 90f of the guide rail portion 90 of the rod portion 80 of the second housing portion 19. The opposing surface 90f of the guide rail portion 90 of the rod portion 80 receives the torque acting on the inner brake pad 4, and the opposing surface 90f serves as a torque receiving portion.

[0054] In addition, the reaction force Ft at the torque receiving portion 90f generates a moment M on the inner brake pad 4. And the rotation of the inner brake pad 4 caused by the moment M is received by the outer side surface 91h in the radial direction of the guide rail portion 91. And, by the reaction force Fa on the outer side surface 91h, a moment M′ in the opposite direction to the moment M acts on the inner brake pad 4. And, by suppressing the change of the posture of the inner brake pad 4 by these moments M and M′, the posture stability can be improved.

[0055] The same is true for the outer brake pad 6. Figure 8 As shown, by the movement of the outer brake pad 6 in the X direction, the bottom of the recessed portion 6ax of the back plate 6r contacts the facing surface 90f of the guide rail portion 90, and the torque acting on the outer brake pad 6 is received by the torque receiving portion 90f.

[0056] Furthermore, the reaction force Ft at the torque receiving portion 90f generates a moment M on the outer brake pad 6. Furthermore, the outer side surface 91h in the radial direction of the guide rail portion 91 receives the rotation of the outer brake pad 6 caused by the moment M, and the moment M′ acts by the reaction force Fa on the outer side surface 90h. The change in the posture of the outer brake pad 6 is suppressed by these moments M and M′.

[0057] When the wheel rotates in the direction opposite to the X direction, the facing surface 91 f of the rail portion 91 serves as a torque receiving portion, and the moment M is received by the radially outer side surface 90 h of the rail portion 90 .

[0058] In this way, the torque acting on the inner brake pad 4 and the outer brake pad 6 is borne by the housing 10 instead of the frame 16. Therefore, the force acting on the circumferential direction of the frame 16 can be suppressed, so that the axial movement of the frame 16 can be smoothed. In addition, since the force acting on the third side 57 and the fourth side 58 can be suppressed, the third side 57 and the fourth side 58 can be made lighter, the frame 16 and the disc brake can be made lighter, and the cost can be reduced.

[0059] In addition, the frame 16 is held on the housing 10 via a pair of pins 60 and 62 so as to be relatively movable in the axial direction. Furthermore, the central axis Cp of the pair of pins 60 and 62 and the central axis C of the first piston 30 and the second piston 32 are located on almost the same plane and are substantially located at the same position when the disc brake is viewed from the side. Therefore, the frame 16 can be further smoothly moved in the axial direction.

[0060] The disc brake is not limited to a hydraulic brake, and may be an electric brake driven by an electric motor, etc. In addition, the present invention may be implemented in various forms with various changes and improvements based on the knowledge of those skilled in the art, in addition to the above-described embodiments.

[0061] [Inventions that can be protected]

[0062] (1) A disc brake is a floating disc brake, which includes: an inner brake pad and an outer brake pad, which are positioned by sandwiching a rotor that rotates together with a wheel of a vehicle; a pressing device that presses the inner brake pad and the outer brake pad against the rotor; and a housing mounted on a non-rotating body and holding the pressing device, wherein the pressing device includes: one or more first pressing members that are held in the housing and can move toward the rotor and one or more second pressing members that can move in a direction away from the rotor; and a driving member that is held in the housing and can move relatively in an axial direction that is parallel to the rotation axis of the rotor, moves along with the movement of the one or more second pressing members, and presses the outer brake pad. The movable block is pressed against the above-mentioned rotor, and the above-mentioned shell includes a first shell part which is arranged at a position closer to the inner side of the above-mentioned vehicle than the above-mentioned rotor and holds the above-mentioned one or more first pressing parts and the above-mentioned one or more second pressing parts, and a second shell part which extends and protrudes from the first shell part toward a position closer to the outer side of the above-mentioned vehicle than the above-mentioned rotor, and the above-mentioned second shell part includes a pair of rod parts which are separated in the circumferential direction and extend in the above-mentioned axial direction, and each of the above-mentioned pair of rod parts respectively has a pair of guide rail parts which are arranged at mutually opposing parts and extend in the above-mentioned axial direction, and the above-mentioned outer brake block can be held on the above-mentioned pair of guide rail parts so as to be relatively movably in the above-mentioned axial direction, and the above-mentioned outer brake block is provided with a torque bearing part which bears the torque acting on the above-mentioned outer brake block.

[0063] The inner brake pad may also be held by the pair of guide rail portions of the pair of rod portions so as to be relatively movable in the axial direction.

[0064] (2) A disc brake according to item (1), wherein the pair of guide rail portions are respectively provided at mutually opposing portions in the circumferential direction of the pair of rod portions in a state of protruding in directions approaching each other, and the torque receiving portion is respectively provided at mutually opposing portions of the pair of guide rail portions.

[0065] (3) A disc brake according to item (1) or (2), wherein the outer brake pad includes a pair of protrusions that protrude radially outward from circumferentially spaced portions along the outer periphery of the outer brake pad, and the outer brake pad is retained on the pair of guide rails by engaging the pair of protrusions with the pair of guide rails, respectively.

[0066] The pair of convex parts may each have a claw part. For example, when a concave part recessed in the circumferential direction is provided at the base part of each of the pair of convex parts on the outer side in the circumferential direction, the radial outer side of the concave part serves as the claw part.

[0067] (4) A disc brake according to any one of items (1) to (3), wherein the inner brake pad is held on the pair of guide rails so as to be relatively movable in the axial direction, and the disc brake includes an elastic member that elastically presses the inner brake pad and the outer brake pad in the radial direction and the circumferential direction respectively, and the elastic member is held on the pair of guide rails.

[0068] The elastic member can be a leaf spring.

[0069] (5) A disc brake according to any one of items (1) to (4), wherein the driving member includes a plurality of pins spaced apart in the circumferential direction and extending in the axial direction, and is retained on the housing via the plurality of pins so as to be relatively movable in the axial direction, and the center axes of the plurality of pins, the center axes of the one or more first pressing members, and the center axes of the one or more second pressing members are located on the same plane.

[0070] In a side view of the disc brake, the central axes of the plurality of pins, the central axes of the one or more first pressing members, and the central axes of the one or more second pressing members are located at substantially the same position.

[0071] The central axes of the plurality of pins, the central axes of the first pressing members, and the central axes of the second pressing members are parallel to each other or extend almost on the same straight line. There is a case where at least one of the central axes of the first pressing members and at least one of the central axes of the second pressing members are almost on the same straight line. In addition, the housing may be provided with a pin and the driving member may be provided with a pin holding hole.

[0072] (6) The disc brake according to item (5), wherein the driving member is symmetrical with respect to a symmetry plane extending parallel to the axial direction, and the plane extends orthogonally to the symmetry plane of the driving member.

[0073] (7) The disc brake according to item (6), wherein a pair of pins as the plurality of pins are provided at positions symmetrical with respect to the symmetric plane of the driving member.

[0074] (8) A disc brake according to item (5), wherein the pressing device comprises a first pressing member and a second pressing member whose central axes extend in a straight line with each other, and the plane extends orthogonally to a plane including the central axis of the first pressing member, the central axis of the second pressing member and the rotation axis of the rotor.

[0075] (9) The disc brake according to any one of items (5) to (8), wherein a pair of pin retaining holes are provided in circumferentially spaced portions of the housing so as to be parallel to each other and extend in the axial direction.

[0076] The central axes of the pair of pin holding holes are parallel to a straight line (a straight line extending from the central axis of the first pressing member and the central axis of the second pressing member). In addition, the central axes of the pair of pin holding holes are located on both sides of the straight line.

[0077] The frame is held by the housing so as to be relatively movable in the axial direction by holding the pair of pins in the pair of pin holding holes so as to be relatively movable in the axial direction.

[0078] (10) A disc brake according to item (9), wherein the driving member comprises a first side opposite to the second pressing member and a second side opposite to the outer brake pad, the pair of pins are arranged on the first side of the driving member, and the pair of pin retaining holes are opened toward the first side and are arranged on the first housing portion.

[0079] The driving member can be formed into a substantially frame shape. The symmetry plane passes through the midpoint of the first side portion and the second side portion, and the pair of pins are arranged at positions symmetrical to the symmetry plane.

[0080] (11) A disc brake according to any one of items (1) to (10), wherein the driving member comprises a first side portion opposite to the second pressing member and a second side portion opposite to the outer brake pad, and the length of the second side portion in the axial direction is shorter than that of the first side portion.

[0081] The axial length of the second side portion may be shorter than 2 / 3, 1 / 2, 1 / 3, 1 / 4, 1 / 5, or the like of the axial length of the first side portion.

[0082] The driving member includes a third side and a fourth side connecting the first side and the second side, the third side and the fourth side extending in a direction intersecting the first side and the second side and being spaced apart in the circumferential direction.

[0083] (12) The disc brake according to item (11), wherein the cross section of the second side portion is formed in a shape such that a portion on the outer side of the vehicle in a radial direction is longer than a portion on a side facing the outer brake pad.

[0084] The bending rigidity with respect to the force applied to the driving member in the axial direction can be increased.

[0085] (13) A disc brake, which is a floating disc brake, includes: an inner brake pad and an outer brake pad, which are positioned by sandwiching a rotor that rotates together with a wheel of a vehicle; a pressing device that presses the inner brake pad and the outer brake pad against the rotor; and a housing that is mounted on a non-rotating body and holds the pressing device, wherein the pressing device includes: one or more first pressing members that are held by the housing and can move toward the rotor and one or more second pressing members that can move in a direction away from the rotor; and a driving member that is held by the housing via a plurality of pins so as to be relatively movable in an axial direction that is parallel to the rotation axis of the rotor, moves along with the movement of the one or more second pressing members, and presses the outer brake pad against the rotor, wherein the central axes of the one or more first pressing members, the central axes of the one or more second pressing members, and the central axes of the plurality of pins are located on the same plane.

[0086] The disc brake described in this item can adopt the technical features described in any one of items (1) to (12).

[0087] (14) The disc brake according to item (13), wherein the driving member is symmetrical with respect to a symmetry plane extending in a direction parallel to the axial direction, and the plane is orthogonal to the symmetry plane.

[0088] (15) A disc brake according to item (13) or (14), wherein, in a side view of the disc brake, the center axes of each of the plurality of pins, the center axes of each of the one or more first pressing members, and the center axes of each of the one or more second pressing members are located at the same position.

[0089] (16) A disc brake according to any one of items (13) to (15), wherein the driving member includes a first side portion opposite to the one or more second pressing members and a second side portion opposite to the outer brake pad, and the plurality of pins are mounted on the first side portion in a posture extending along the axial direction.

[0090] (17) A disc brake according to any one of items (13) to (16), wherein a pair of pin retaining holes extending in the axial direction are provided in portions spaced apart along the circumferential direction of the first housing portion, and the driving member is retained in the first housing portion in a movably axial direction by retaining a pair of pins as one of the plurality of pins provided in the driving member in the pair of pin retaining holes formed in the first housing portion.

[0091] (18) The disc brake according to item (16) or (17), wherein, in the driving member, the length of the second side in the axial direction is shorter than the length of the first side in the axial direction.

[0092] (19) A disc brake is a floating disc brake, comprising: an inner brake pad and an outer brake pad, which are positioned by clamping a rotor that rotates together with a wheel of a vehicle; a pressing device that presses the inner brake pad and the outer brake pad against the rotor; and a housing that is mounted on a non-rotating body and holds the pressing device, wherein the pressing device comprises: one or more first pressing members that are held in the housing and can move toward the rotor and one or more second pressing members that can move in a direction away from the rotor; and a driving member that can move in a direction that is in contact with the rotor. The driving member is held relatively movable in the axial direction parallel to the rotation axis on the housing, moves along with the movement of the one or more second pressing members, and presses the outer brake pad against the rotor. The driving member forms a generally frame shape, including a first side opposite to the one or more second pressing members, a second side opposite to the outer brake pad, and a third side and a fourth side which are circumferentially spaced from each other and connect the first side with the second side, and the length of the second side in the axial direction is shorter than the length of the first side in the axial direction.

[0093] The disc brake described in this item can adopt the technical features described in any one of items (1) to (18).

[0094] (20) The disc brake according to item (19), wherein the length of the second side in the axial direction is shorter than 1 / 2 of the length of the first side in the axial direction.

[0095] The axial length of the second side portion may be shorter than 1 / 3, shorter than 1 / 4, or shorter than 1 / 5 of the axial length of the first side portion.

[0096] (21) A disc brake according to item (19) or (20), wherein the cross-section of the second side portion is shaped such that a portion on the outer side of the vehicle in a radial direction is longer than a portion on a side facing the outer brake pad.

Claims

1. A disc brake is a floating disc brake, comprising: The inner brake pad and the outer brake pad are positioned to sandwich a rotor that rotates together with the wheel of the vehicle; A pressing device presses the inner brake pad and the outer brake pad against the rotor; as well as A housing is mounted on the non-rotating body and holds the pressing device, Wherein, the pressing device comprises: one or more first pressing members held by the housing and movable toward the rotor and one or more second pressing members movable in a direction away from the rotor; and a driving member held by the housing so as to be relatively movable in an axial direction parallel to the rotation axis of the rotor, and moving along with the movement of the one or more second pressing members to press the outer brake pad against the rotor, The housing includes a first housing portion that is disposed at an inner side of the vehicle than the rotor and holds the one or more first pressing members and the one or more second pressing members, and a second housing portion that extends from the first housing portion toward an outer side of the vehicle than the rotor. The second housing portion includes a pair of rod portions spaced apart in the circumferential direction and extending in the axial direction, and each of the pair of rod portions has a pair of guide rail portions provided at mutually opposing portions and extending in the axial direction. The outer brake pad is held by the pair of guide rails so as to be relatively movable in the axial direction, and a torque receiving portion for receiving torque acting on the outer brake pad is provided on the pair of guide rails. The outer brake pad includes a pair of convex portions, each of which is provided at a portion separated from the outer peripheral portion of the outer brake pad in a circumferential direction and protrudes outward in a radial direction, and the outer brake pad is retained on the pair of guide rail portions by engaging the pair of convex portions with the pair of guide rail portions, respectively. The outer brake pad includes, in addition to the convex portion, a pair of concave portions located radially inward of the convex portion. The pair of guide rails are respectively provided at mutually opposing portions of the pair of rods in the circumferential direction in a state of protruding in a direction approaching each other, and respectively include radially outer side surfaces facing radially outer sides and opposing surfaces protruding in the circumferential direction and opposing each other. The outer brake pad is held on the pair of guide rails in the following state: The bottom surfaces of the radial inner sides of the pair of convex parts of the outer brake pad are respectively in contact with the outer side surfaces of the pair of guide rail parts, and there are gaps between the bottom surfaces of the pair of concave parts of the outer brake pad and the opposing surfaces of the pair of guide rail parts. By the movement of the outer brake pad in the circumferential direction, the bottom surface of the recessed portion contacts the opposing surface of the guide rail portion, and the opposing surface receives the torque acting on the outer brake pad, thus forming the torque receiving portion. When the wheel rotates, the torque acting on the outer brake pad is received by the guide rail portion of the second case portion included in the case, not by the frame serving as the driving member.

2. The disc brake according to claim 1, wherein: The inner brake pad is held on the pair of guide rails so as to be relatively movable in the axial direction. The disc brake includes an elastic member that elastically presses the inner brake pad and the outer brake pad in the radial direction and the circumferential direction, respectively. The one elastic member is held by the pair of rail portions.

3. The disc brake according to claim 1, wherein: The driving member includes a plurality of pins that are spaced apart in the circumferential direction and extend in the axial direction, and is held by the housing via the plurality of pins so as to be relatively movable in the axial direction. The central axes of the plurality of pins, the central axes of the one or more first pressing members, and the central axes of the one or more second pressing members are located on the same plane.

4. The disc brake according to claim 3, wherein: The driving member is formed in a shape symmetrical with respect to a symmetry plane extending parallel to the axis direction. The plane extends orthogonally to the plane of symmetry of the drive member.

5. The disc brake according to claim 4, wherein: A pair of pins as the plurality of pins are respectively arranged at positions symmetrical with respect to the symmetry plane of the driving member, A pair of pin holding holes that are parallel to each other and extend in the axial direction are respectively provided at circumferentially spaced portions of the housing.

6. The disc brake according to any one of claims 1 to 5, wherein: The driving member includes a first side portion facing the one or more second pressing members and a second side portion facing the outer brake pad. The length of the second side portion in the axial direction is shorter than that of the first side portion.

7. The disc brake according to claim 6, wherein: The length of the second side portion in the axial direction is shorter than 1 / 3 of the length of the first side portion in the axial direction.

8. The disc brake according to claim 6, wherein: The cross section of the second side portion is shaped such that a portion on the outer side of the vehicle in the radial direction is longer than a portion on the side facing the outer brake pad.

9. The disc brake according to claim 7, wherein: The cross section of the second side portion is shaped such that a portion on the outer side of the vehicle in the radial direction is longer than a portion on the side facing the outer brake pad.

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