WO2010024400A1

WO2010024400A1 - Disc brake

Info

Publication number: WO2010024400A1
Application number: PCT/JP2009/065096
Authority: WO
Inventors: 健藤木
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2008-08-29
Filing date: 2009-08-28
Publication date: 2010-03-04
Also published as: JP2010054038A

Abstract

A simply configured disc brake and an actuator for the disc brake. A rotation stop mechanism (130) is provided between a push rod (122) and a fixed ramp member (65) of a ball-ramp mechanism (62). The rotation stop mechanism (130) permits linear motion of the push rod (122) while restricting relative rotation between the push rod (122) and the fixed ramp member (65) by causing the push rod (122) and the fixed ramp member (65) to be in contact with each other in the direction of rotation of a movable ramp member (67) of the ball-ramp mechanism (62).

Description

Disc brake

The present invention relates to a disc brake.

As a disc brake used for vehicle braking, there is a parking brake combined type disc brake (see, for example, Patent Document 1).

Japanese National Patent Publication No. 3-503202

The structure of the above-described disc brake, particularly the actuator, was complicated.

Therefore, an object of the present invention is to provide a disc brake capable of simplifying the structure.

The disc brake of the present invention is provided with a rotation mechanism that allows linear movement of the push rod while abutting each other in the rotation direction of the moving ramp member and restricting relative rotation between the fixed ramp member and the push rod. In the fixed lamp member, the locking portion of the cover member can be inserted and locked.

According to the present invention, the structure can be simplified.

1 is a side sectional view showing a disc brake of a first embodiment according to the present invention. It is a partial expanded side sectional view which shows the principal part of the disc brake of 1st Embodiment which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS The disc brake actuator which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a side view, (b) is side sectional drawing. The fixed ramp member which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a B1 arrow directional view of (a), (c) is (a). It is C1 arrow line view. The push rod which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a side view, (b) is B2 arrow directional view of (a). The cover member which comprises the disc brake of 1st Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a B3 arrow view of (a), (c) is C3 of (a). It is an arrow view. FIG. 5 is a side sectional view showing the first half of the assembly procedure of the disc brake actuator constituting the disc brake of the first embodiment according to the present invention in the order of (a) to (c). FIG. 6 is a side sectional view showing the second half of the assembly procedure of the disc brake actuator constituting the disc brake of the first embodiment according to the present invention in the order of (a) to (c). It is a principal part expanded side sectional view which shows the assembly | attachment condition of the actuator for disk brakes to the disk brake of 1st Embodiment which concerns on this invention in order of (a), (b). It is a partial expanded side sectional view which shows the principal part of the disc brake of 2nd Embodiment which concerns on this invention. The fixed ramp member which comprises the disc brake of 2nd Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a B4 arrow view of (a), (c) is (a). It is C4 arrow line view. The cover member which comprises the disc brake of 2nd Embodiment which concerns on this invention is shown, (a) is a top view, (b) is a sectional side view. It is sectional drawing which shows the cover member and fixed lamp member which comprise the disk brake of 2nd Embodiment which concerns on this invention, (a) shows the state which latched the cover member to the fixed lamp member, (b) is a cover. The state which the latching to the fixed lamp member of a member is released is shown. It is a partial expanded side sectional view which shows the principal part of the disc brake of 3rd Embodiment which concerns on this invention. FIG. 15 is a sectional view taken along line XX of FIG. 14 showing a caliper member constituting the disc brake of the third embodiment according to the present invention.

Embodiments according to the present invention will be described below with reference to the drawings.
“First Embodiment”
A first embodiment according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the disc brake 10 of the first embodiment is slidably supported in a state of being disposed on both sides via a disc 12 on a carrier (not shown) fixed to a non-rotating portion of the vehicle. A pair of pads 13 and a caliper 14 supported by the carrier so as to be slidable along the axial direction of the disk 12 and sandwiching the pair of pads 13 from both sides.

The caliper 14 has a cylinder tube portion 15 and a cylinder bottom portion (bottom portion) 16 that closes one end of the cylinder tube portion 15, and has a bottomed tube in which the cylinder opening portion 17 is opposed to the disk 12 of one pad 13 on the opposite side. Cylinder 18, a disk path portion 19 extending from one side of the cylinder 18 in the radial direction across the outer periphery of the disk 12, and the other pad 13 from the opposite side of the cylinder 18 of the disk path portion 19. A caliper member 21 having a claw portion 20 extending so as to face the opposite side of the disc 12 is provided. The inner peripheral surface of the cylinder tube portion 15 is referred to as a bore 22.

A central through hole 26 penetrating along the axial direction of the bore 22 is formed in the cylinder bottom portion 16 of the caliper member 21 at the center position of the bore 22, and outside the central through hole 26 in the radial direction of the bore 22. A pin hole 27 is formed at a position from the bore 22 side to a predetermined depth position. A cylindrical stop pin 28 is fitted in the pin hole 27. The central through hole 26 has a stepped shape including a main hole 29 and a large-diameter hole 30 formed at the end of the main hole 29 on the bore 22 side. A cylindrical portion 31 that is coaxial with the central through hole 26 and a plurality of ribs 32 that extend radially outward from the cylindrical portion 31 are formed outside the cylinder bottom portion 16.

Further, the bore 22 of the cylinder tube portion 15 of the caliper member 21 is formed with a fitting hole 35 having a constant diameter closest to the cylinder bottom portion 16, and in the vicinity of the end of the fitting hole 35 on the cylinder opening portion 17 side. An annular ring groove 36 having a diameter larger than that of the fitting hole 35 is formed coaxially. Further, in the bore 22 of the cylinder tube portion 15, an intermediate hole 37 having a larger diameter than the fitting hole 35 and the ring groove 36 is formed coaxially on the cylinder opening 17 side with respect to the ring groove 36. A sliding hole 38 having a smaller diameter than the intermediate hole 37 and a larger diameter than the fitting hole 35 and the ring groove 36 is formed closer to the cylinder opening 17 than the intermediate hole 37. Further, an annular seal groove 39 having a diameter larger than that of the fitting hole 35 is coaxially formed in the bore 22 of the cylinder cylindrical portion 15 in the vicinity of the end portion of the sliding hole 38 on the cylinder opening portion 17 side. An annular boot groove 40 having a diameter larger than that of the fitting hole 35 is coaxially formed on the cylinder opening 17 side of the seal groove 39. A tapered chamfer 41 is formed at the position of the cylinder opening 17.

The caliper 14 is formed in a covered cylinder shape having a cylindrical portion 45 and a lid portion 46, and is slidable in the sliding hole 38 of the cylinder 18 of the caliper member 21 with the lid portion 46 side facing the pad 13 side. The piston 47 to be fitted, the annular piston seal 48 that is held in the seal groove 39 of the cylinder 18 and seals the gap between the piston 47 and the bore 22 of the cylinder 18, and one end of the cylinder 18 described above. The boot groove 40 is fitted into the boot groove 40, and the other end has a stretchable boot 50 fitted into the boot groove 49 in the outer peripheral portion on the lid portion 46 side of the piston 47. On the lid portion 46 side of the piston 47, a through hole 51 penetrating inside and outside is formed so as to open into the boot groove 49, and a boot 50 is attached so as to close the through hole 51.

The caliper 14 is caused to slide in the sliding hole 38 of the cylinder 18 by the brake hydraulic pressure introduced between the cylinder 18 and the piston 47 and project in the direction of the pad 13 from the cylinder 18. By holding the pair of pads 13 from both sides by the piston 47 and the claw portion 20, the pads 13 are pressed against the disk-shaped disc 12.

The pair of pads 13 includes a back plate 55 that is held by a carrier (not shown) and pressed by the piston 47 or the claw portion 20, and a friction material 56 that is joined to the back plate 55 and contacts the disk 12. . The pair of pads 13 has a shim 57 attached to the back plate 55 so as to cover it, and abut against the piston 47 or the claw portion 20 via the shim 57.

As described above, the piston 47 is protruded from the cylinder 18 toward the claw portion 20 by the brake hydraulic pressure introduced into the cylinder 18 from a master cylinder (not shown) during normal braking by depressing the brake pedal. The pair of pads 13 is pressed against the disk 12 to generate a braking force. However, the piston 47 is mechanically protruded into the cylinder 18 instead of such a brake fluid pressure. A parking brake mechanism 61 is provided that presses the disc 12 to generate a braking force.

As shown in FIG. 2, the parking brake mechanism 61 has a ball ramp mechanism 62 that is disposed in the cylinder 18 of the caliper member 21 with a part protruding outward from the central through hole 26 of the cylinder bottom 16. .

The ball ramp mechanism 62 includes a fixed ramp member 65 disposed in the cylinder 18 and in contact with the cylinder bottom portion 16, a ball 66 provided on the opposite side of the fixed ramp member 65 from the cylinder bottom portion 16, and the ball 66 as a fixed ramp. A moving ramp member 67 is provided so as to be interposed between the member 65 and the member 65.

The fixed ramp member 65 is formed by forging. The fixed ramp member 65 has a disk-like bottom portion 71 that contacts the cylinder bottom portion 16 and a cylindrical shape as a whole from the outer peripheral edge of the bottom portion 71 to one side in the axial direction. It is formed in a cup shape having a side wall portion 72 that rises. As shown in FIGS. 3 and 4, the bottom 71 is formed with a through hole 73 penetrating in the axial direction at the center thereof, and also in the axial direction between the through hole 73 and the side wall 72. A rotation stop hole (regulating portion, fixing portion) 74 is formed. Further, on the bottom surface of the bottom portion 71, as shown in FIG. 4A, a ramp groove 75 whose depth varies in the circumferential direction at a position different from the through hole 73 and the stop hole 74 is provided in the circumferential direction. A plurality (specifically, three locations) are formed concentrically at equal positions.

Here, as shown in FIG. 2, the stop hole 74 allows the stop pin 28 fitted in the pin hole 27 of the cylinder bottom portion 16 to be inserted, whereby the fixed ramp member 65 is inserted into the cylinder 18. Is prevented against rotation. In other words, the fixed ramp member 65 is provided on the cylinder bottom portion 16 so as not to rotate by the stop pin 28, in other words, the rotation direction is restricted with respect to the cylinder 18 by the stop hole 74 and the rotation is impossible. Further, the ramp groove 75 shown in FIG. 4 (a) has a recess 75a that can hold the ball 66 deepest at the center in the circumferential direction, and the depth becomes deeper toward the sides of the recess 75a in the circumferential direction. A shallow inclined portion 75b is formed.

As shown in FIG. 4 (b), the fixed ramp member 65 has an axial hole 78 in a shape extending in the axial direction with a constant width in the circumferential direction and extending away from the bottom 71, as shown in FIG. As shown in FIG. 4A, a plurality (specifically, three locations) are formed at equal positions in the circumferential direction. Further, as shown in FIG. 4C, a hook-shaped hole (locking hole) 79 is formed at a position between all the axial holes 78 adjacent in the circumferential direction. That is, the same number of bowl-shaped holes 79 as the axial holes 78 are formed (specifically, three places).

The bowl-shaped hole 79 includes an axial hole (first hole) 81 formed from the side opposite to the bottom 71 of the side wall 72 to the front of the bottom 71 in the axial direction, and a continuous circle in the axial hole 81. It consists of a radial hole (second hole) 82 formed adjacent to the circumferential direction in the axial direction of the side wall portion 72 in the radial direction. In other words, the axial hole 81 has a shape that extends away from the bottom 71 in the axial direction of the side wall 72, and the radial hole 82 does not escape to the side opposite to the bottom 71 in the axial direction of the side wall 72. It has a shape. As shown in FIG. 4A, each of the axial holes 81 is formed in correspondence with the ramp groove 75, and is formed in alignment with the ramp groove 75 in the circumferential direction.

As shown in FIG. 4 (c), the axial hole 81 and the radial hole 82 described above allow the bowl-shaped hole 79 to be connected to a narrow portion 85 having a constant width that is narrow in the circumferential direction on the opposite side to the bottom portion 71. The bottom portion 71 is a wide portion 86 having a constant width wider than the narrow portion 85 in the circumferential direction, and the wide portion 86 and the narrow portion 85 are arranged in the circumferential direction of the side wall portion 75. One side is aligned, and the opposite side is stepped. As a result, the side wall portion 75 is a standing wall having a constant width in the circumferential direction between the side where the narrow portion 85 and the wide portion 86 are continuous and the axial hole 78 and standing in the axial direction of the fixed ramp member 65. A constant width in the circumferential direction between the wide portion 86 and the axial hole 78 on the stepped side of the portion 88, the wide portion 86 and the narrow portion 85, which is erected in the axial direction of the fixed lamp member 65. A locking extension wall 90 that extends in the circumferential direction so as to partially cover the wide portion 86 from the end wall 89 and the end opposite to the bottom portion 71 of the standing wall 89 to form a narrow portion 85. And have. A locking protrusion 91 that protrudes in the direction of the bottom 71 is formed at the end of the locking extension wall 90 opposite to the standing wall 89. The bottom surface of the wide portion 86 and the bottom surface of the locking extension wall portion 90 are parallel to the bottom surface of the bottom portion 71.

Here, in the fixed lamp member 65, the position of the bottom surface of the wide portion 86 that is the end portion of the flange-shaped hole 79 on the bottom portion 71 side is more than the position of the bottom surface that is the end portion of the axial hole 78 on the bottom portion 71 side. It is on the bottom 71 side. Further, in the fixed ramp member 65, the height from the bottom 71 is higher in the standing wall portion 89 in which the locking extension wall portion 90 is formed in the upper portion than in the standing wall portion 88 having a constant width. The positions of the fixed lamp member 65 in the axial direction of the lower surface that is the end portion on the bottom 71 side of the extending wall portion 90 and the upper surface that is the end portion on the side opposite to the bottom portion 71 of the standing wall portion 88 with a constant width are aligned. ing. Further, in the bowl-shaped hole 79, an axial hole 81 formed in the axial direction is made larger than the diameter of the ball 66, and the ball 66 is fixed to the fixed ramp member via the axial hole 81 from the side wall 72 side. 65, and the ball 66 is inserted in this manner, so that the axial groove 81 formed in the axial direction is aligned with the circumferential position of the lamp groove 75 formed in the bottom portion 71. It is possible to arrange it by a short distance movement.

2 and 3, the moving ramp member 67 includes a shaft portion 95 and a disk portion 96 that is coaxial with the shaft portion 95 from one end of the shaft portion 95 and extends in the radial direction. A ball holding recess 97 is formed on the surface of the disc portion 96 on the shaft portion 95 side. Further, a chamfered portion 98 is formed on the outer diameter side of the disc portion 96 on the side opposite to the shaft portion 95, and a relief recess 99 is formed in the center. The shaft portion 95 of the moving ramp member 67 has an insertion portion 101 having a constant diameter on the disc portion 96 side, and an annular fitting groove 102 is formed on the opposite side of the insertion portion 101 from the disc portion 96. A serration 103 is formed over the entire circumference on the tip side of the joint groove 102, and a male screw 104 is formed on the end portion on the tip side further than the serration 103.

As shown in FIG. 2, the moving ramp member 67 has a shaft portion 95 of the fixed ramp member 65 while the ball 66 is accommodated in the ball holding recess 97 in a state where the ball 66 is disposed in the ramp groove 75 of the fixed ramp member 65. The shaft portion 95 is further inserted into the central through hole 26 of the cylinder bottom portion 16 so as to protrude outward from the cylinder bottom portion 16. Here, in the central through hole 26 of the cylinder bottom portion 16, a collar 108 having a flange portion 107 formed at one end on the main hole portion 29 side of the main hole portion 29 and the large diameter hole portion 30 causes the flange portion 107 to have a large diameter. The O-ring 109 is fitted to the bore 22 side from the flange portion 107 of the large-diameter hole 30. The moving ramp member 67 is inserted inside the O-ring 109 and the collar 108 at the insertion portion 101 of the shaft portion 95, and the O-ring 109 seals the gap between the moving ramp member 67 and the cylinder 18.

The engaging groove 102, the serration 103, and the male screw 104 of the shaft portion 95 of the moving ramp member 67 protrude outward from the cylinder 18. A shaft cover 111 is disposed inside the cylindrical portion 31 of the cylinder 18, and a plate-like operating member 112 is attached in the direction perpendicular to the axis so as to fit the serration 103 of the shaft portion 95 of the moving ramp member 67. The nut 113 is screwed onto the male screw 104 of the shaft portion 95. The operating member 112 is non-rotatably fitted to the shaft portion 95 of the moving ramp member 67 by the serration 103. When the nut 113 is fastened to the shaft portion 95, the operating member 112 is fixed integrally to the moving ramp member 67. The Here, the shaft cover 111 extends in a tapered shape from a cylindrical base portion 115 fitted to the cylindrical portion 31 of the cylinder 18 and an inner peripheral side of one end of the base portion 115 in the axial direction. An inner cover portion 116 that fits into the fitting groove 102 and an outer cover portion 117 that extends from the outer peripheral side of the one end of the base portion 115 in a front-opening shape and abuts against the cylinder 18 side surface of the operating member 112. Yes.

As described above, the operating member 112 is integrally coupled to the moving ramp member 67 outside the cylinder 18, and an operation member including a parking brake lever or a parking brake pedal provided in the cab is operated. When the operating member 112 receives a rotation input, the ball ramp mechanism 62 rotates the moving ramp member 67 coupled to the operating member 112 according to the rotation of the operating member 112. Then, according to the rotation of the moving ramp member 67, the ball 66 held in the ball holding recess 97 moves the ramp groove 75 of the fixed ramp member 65 from the recess 75a to the inclined portion 75b, thereby moving the moving ramp member 67 along the axis. It will move directly in the direction. That is, the ball ramp mechanism 62 converts the rotational motion of the operating member 112 into the linear motion of the moving ramp member 67. The axial hole 78 of the fixed ramp member 65 is a gap between the disc portion 96 of the moving ramp member 67 and the bottom portion 71 of the fixed ramp member 65 located closest to the cylinder bottom portion 16 from the opening side of the fixed ramp member 65. Is formed to extend to the vicinity. More specifically, the axial hole 78 of the fixed ramp member 65 is formed on the surface on the cylinder bottom 16 side of the disc portion 96 of the moving ramp member 67 located closest to the cylinder bottom 16 from the opening side of the fixed ramp member 65. Extends to position.

The parking brake mechanism 61 includes a sliding disc 121 disposed on the opposite side of the shaft portion 95 of the disc portion 96 of the moving ramp member 67 of the ball ramp mechanism 62 in the cylinder 18, and the sliding disc 121 as a circle. A push rod 122 that abuts on the disk part 96 via the sliding disk 121 so as to be sandwiched between the plate part 96 and moves in the axial direction of the cylinder 18 by receiving the direct-acting pressing force of the moving ramp member 67. And have. That is, the push rod 122 is disposed in the cylinder 18 and moves in the same direction by the linear motion of the ball ramp mechanism 62. A through hole 120 is formed at the center of the sliding disk 121.

The push rod 122 has substantially the same diameter as the end surface opposite to the shaft portion 95 of the disc portion 96 of the moving ramp member 67, and receives the direct-acting pressing force of the moving ramp member 67 via the sliding disc 121. It has a disk-shaped flange portion 123 and a screw shaft portion (screw portion) 124 that protrudes in the shape of a shaft from the center of the flange portion 123 to the side opposite to the moving ramp member 67. As shown in FIG. 5, a plurality of protrusions 125 having a constant width in the circumferential direction projecting radially outward (that is, in the outer diameter direction) from the outer peripheral portion of the flange portion 123 at equal positions in the circumferential direction. Specifically, three places are formed. As shown in FIG. 2, the protrusion 125 is an inclined portion that is inclined so as to be positioned on the opposite side of the screw shaft portion 124 toward the radially outer side along the chamfered portion 98 of the disk portion 96 of the moving ramp member 67. 126 and a slide portion 127 protruding outward from the tip of the inclined portion 126 along the radial direction. Further, the push rod 122 is formed with a positioning convex portion 128 that protrudes opposite to the screw shaft portion 124 at the center of the flange portion 123. When the sliding disk 121 is sandwiched between the positioning convex part 128 and the moving ramp member 67, the positioning convex part 128 is fitted into the through hole 120 of the sliding disk 121 and enters the escape concave part 99 of the moving ramp member 67. Is held in the center. In the push rod 122, the inclined portions 126 of the plurality of protrusions 125 are along the chamfered portion 98 of the moving ramp member 67, so that the flange portion 123 side can be kept coaxial with the moving ramp member 67. Yes.

Since the push rod 122 receives the direct-acting pressing force of the moving ramp member 67, the screw shaft portion 124 transmits the direct-acting pressing force of the moving ramp member 67 and outputs the direct acting. The push rod 122 is fitted with a plurality of protrusions 125 slidably in a one-to-one manner in the plurality of axial holes 78 of the fixed ramp member 65 at the slide part 127 at the tip. As a result, the push rod 122 is in a state in which the rotation around the axis is restricted with respect to the fixed ramp member 65, and is movable in the axial direction by sliding the slide portion 127 through the axial hole 78 (that is, separated). And proximity is possible). Here, a plurality of protrusions 125 of the push rod 122 and a plurality of axial holes 78 of the fixed ramp member 65 are provided between the fixed ramp member 65 and the push rod 122, and in the rotational direction of the moving ramp member 67. A rotation stop mechanism 130 that allows linear movement of the push rod 122 while restricting relative rotation between the fixed ramp member 65 and the push rod 122 is configured. In other words, the plurality of axial holes 78 of the fixed ramp member 65 guide the push rod 122 so that it can linearly move while restricting the relative rotation of the push rod 122.

The parking brake mechanism 61 has a substantially cylindrical clutch member 132 that is disposed in the cylinder 18 and is screwed onto the screw shaft portion 124 of the push rod 122 with a female screw 131 formed on the inner diameter side.

Here, the inner diameter side of the piston 47 is a small diameter inner diameter portion 135 having a small diameter on the lid portion 46 side, and an intermediate inner diameter portion 136 having a larger diameter than the small diameter inner diameter portion 135 on the opening side. The opening side of the portion 136 is a large-diameter inner diameter portion 137 having a larger diameter. Between the small-diameter inner diameter portion 135 and the intermediate inner-diameter portion 136, in order from the small-diameter inner-diameter portion 135 side, a tapered surface portion 139 is formed so as to be continuous with the small-diameter inner-diameter portion 135 so that the intermediate inner-diameter portion 136 side has a larger diameter. A stepped portion 140 having an annular step shape with a larger diameter than the large-diameter side of 139, and a tapered surface portion 141 that is continuous with the stepped portion 140 so as to have a larger diameter on the intermediate inner diameter portion 136 side and continues to the intermediate inner diameter portion 136. Are formed coaxially with the small-diameter inner diameter portion 135 and the intermediate inner diameter portion 136.

Further, on the inner diameter side of the piston 47, a communication groove 142 penetrating the intermediate inner diameter portion 136 and the tapered surface portion 141 is formed along the axial direction so as to connect the large diameter inner diameter portion 137 and the stepped portion 140. An annular locking groove 143 is formed in the intermediate inner diameter portion 136, and the above-described through hole 51 is formed on the lid portion 46 side of the small diameter inner diameter portion 135.

The front end side of the clutch member 132 is a fitting portion 147 that fits into the small-diameter inner diameter portion 135 of the piston 47, and a flange portion 148 that is adjacent to the fitting portion 147 and extends in the radial direction is formed. . A tapered portion 149 that contacts the tapered surface portion 141 of the piston 47 is formed coaxially on the fitting portion 147 side of the flange portion 148. An annular seal groove 150 is formed in the fitting portion 147 of the clutch member 132. A ring-shaped clutch member seal 151 is held in the seal groove 150. The clutch member seal 151 seals a gap between the fitting portion 147 of the clutch member 132 and the small diameter inner diameter portion 135 of the piston 47. In the clutch member 132, the end on the fitting portion 147 side of the inner peripheral portion where the female screw 131 is formed is closed with a lid 152.

Here, when the moving ramp member 67 is moved to the push rod 122 side by rotating the moving ramp member 67 of the ball ramp mechanism 62, it is pressed by the moving ramp member 67 and the push rod 122 is moved in the axial direction. The clutch member 132 is linearly moved in the axial direction by being pushed by the push rod 122, and the clutch member 132 is brought into contact with the tapered surface portion 141 of the piston 47 at the taper portion 149 so that the piston 47 is moved to the cylinder 18. Forcibly slide toward the pad 13 side. That is, the clutch member 132 transmits the direct-acting pressing force of the moving ramp member 67 to the piston 47.

The screw shaft portion 124 of the push rod 122 and the female screw 131 of the clutch member 132 have a clearance that can move in the axial direction by a predetermined amount without rotating between the push rod 122 and the clutch member 132. .

Further, the above-described hole 51 on the lid portion 46 side of the piston 47 is for opening the gap between the piston 47 and the clutch member 132 to the atmosphere.

The parking brake mechanism 61 has an adjusting portion 155 that adjusts the position of the clutch member 132 and the push rod 122 in the cylinder 18. The adjusting portion 155 is supported between the piston 47 and the flange portion 148 of the clutch member 132 by a retaining ring 156 that is locked in a locking groove 143 formed in the intermediate inner diameter portion 136 of the piston 47. When the piston 47 moves in the axial direction by the brake fluid pressure introduced into the cylinder 18, the piston 47 is caused to follow the piston 47 while rotating the clutch member 132 with respect to the push rod 122 which is substantially stopped. Move in the axial direction. Further, the adjustment portion 155 does not rotate the clutch member 132 relative to the push rod 122 when the push rod 122 linearly moves in the axial direction. As a result, the screw shaft portion 124 and the female screw 131 cause the clutch member 132 to rotate. 132 is moved linearly together with the push rod 122.

The parking brake mechanism 61 is interposed between the cover member 160 provided so as to cover a part of the push rod 122, the flange portion 123 of the push rod 122, and the piston 47 side of the cover member 160. Is engaged with a push rod biasing spring (push rod biasing member) 161 that biases the ball lamp mechanism 62 toward the ball ramp mechanism 62 and a ring groove 36 of the cylinder 18 to lock the cover member 160 to the cylinder 18. A retaining ring 162 that restricts movement in the direction of the cylinder opening 17 is provided. The cover member 160, the push rod biasing spring 161, and the retaining ring 162 are also disposed in the cylinder 18. In other words, the cover member 160 holds the push rod biasing spring 161 with the push rod 122.

The cover member 160 has a ring-shaped bottom portion 165 into which the clutch member 132 is inserted, and a side wall portion 166 extending from the outer peripheral edge of the ring-shaped bottom portion 165 to one side in the axial direction as shown in FIG. It has a cup shape. The side wall portion 166 is a cylindrical base portion 170 in which a portion connected to the ring-shaped bottom portion 165 has a cylindrical shape with a certain length in the axial direction. Further, the side wall 166 has a long extending portion 171 that extends from the cylindrical base portion 170 along the axial direction to the opposite side of the ring-shaped bottom portion 165 with a constant width narrow in the circumferential direction. A plurality of (specifically, three) positions are formed, and a short length that is shorter than the long extension portion 171 and that extends to the opposite side of the ring-shaped bottom portion 165 along the axial direction with a constant width that is wider in the circumferential direction. A plurality (specifically, three) of extending portions 172 are formed at equal positions in the circumferential direction.

Here, the cover member 160 has a short extending portion 172 formed on one side of the long extending portion 171 adjacent in the circumferential direction, and as a result, on both sides in the circumferential direction of the short extending portion 172. As shown in FIG. 6 (b), on the one hand, a narrow groove 173 having a shape with a constant width narrow in the circumferential direction and extending in the opposite direction to the cylindrical base 170 along the axial direction is formed on the other side. A wide groove 174 having a constant width wider than the groove 173 and extending in the axial direction opposite to the cylindrical base 170 is formed. A plurality (specifically, three locations) of narrow-cut grooves 173 are also formed at equal positions in the circumferential direction, and a plurality (specifically, three positions) of wide-cut grooves 174 are also formed at equal positions in the circumferential direction. ing.

The end of the long extension portion 171 opposite to the ring-shaped bottom portion 165 is bent radially outward to form a long position locking portion (first locking portion) 175, and the ring of the short extension portion 172 The end opposite to the bottom 165 is also bent outward in the radial direction to form a short position locking part (second locking part) 176. Both the long position locking portion 175 and the short position locking portion 176 that are formed to be shifted from each other in the circumferential direction are parallel to the ring-shaped bottom portion 165. As described above, since the extension length of the long extension portion 171 is longer than the extension length of the short extension portion 172, the long position locking portion 175 of the long extension portion 171 has a length from the ring-shaped bottom portion 165. The distance is longer than the distance from the ring-shaped bottom part 165 of the short position locking part 176 of the short extension part 172. In other words, the short position locking portion 176 is formed on the ring-shaped bottom 165 side of the cover member 160 relative to the long position locking portion 175. In other words, the long position locking portion 175 of the long extension portion 171 and the short position locking portion 176 of the short extension portion 172 are arranged on the outer periphery of the opening opposite to the ring-shaped bottom portion 165 in the cover member 160, respectively. A plurality of locations are alternately formed at intervals in the direction.

As shown in FIG. 2, the cover member 160 is locked to the cylinder bottom 16 side of the retaining ring 162 held in the ring groove 36 of the cylinder tube portion 15 in the short position locking portion 176, and as a result, Movement in the direction of the cylinder opening 17 is restricted. Further, the cover member 160 is configured such that the long position locking portion 175 of the long extending portion 171 can be inserted and locked into the hook-shaped hole 79 of the fixed ramp member 65. Specifically, as shown in FIG. 4C, the long position locking portion 175 of the long extension portion 171 is disposed in the radial hole 82 of the flanged hole 79 of the fixed ramp member 65, and the side wall portion 72. The locking projection 91 and the standing wall 89 are locked to the locking extension wall 90. The flange-shaped hole 79 has a height of the wide portion 86 larger than the thickness of the long position locking portion 175 of the cover member 160, and as a result, the long position locking portion 175 of the cover member 160 is moved from the locked state to the long position. The locking portion 175 is formed so as to be movable in the direction of the bottom portion 71 of the fixed ramp member 65.

The ball ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 shown in FIG. 2 are assembled into the caliper member 21 in a preassembled and cartridge state. Become.

That is, first, as shown in FIG. 7A, the fixed lamp member 65 is arranged with the bottom portion 71 facing downward, and as shown in FIG. 7B, the lamp groove 75 of the bottom portion 71 of the fixed lamp member 65 is arranged. A ball 66 is disposed on the surface. At this time, the lamp groove is aligned with the axial hole 81 in the circumferential direction through the axial hole 81 of the bowl-shaped hole 79 formed in the side wall 72 of the fixed ramp member 65 from the side. Thus, the height difference with the ramp groove 75 at the time of charging is shortened to suppress jumping and the like. The ball 66 thrown into the ramp groove 75 stops at its own weight in the recess 75a shown in FIG.

Next, as shown in FIG. 7C, from the upper side, the moving ramp member 67 is inserted into the inside of the side wall portion 72 of the fixed ramp member 65 with the shaft portion 95 positioned downward, and the shaft portion 95 is inserted into the fixed ramp member. The disc portion 96 is mounted on the ball 66 through the through hole 73 of 65. Then, the ball 66 is fitted into the ball holding recess 97 by appropriately rotating the moving ramp member 67.

Next, as shown in FIG. 8A, after the sliding disk 121 is laid on the disk part 96 of the moving ramp member 67 so that the position of the through hole 120 is aligned with the escape recess 99, the push rod 122 is mounted. The sliding part 127 of the projection 125 is inserted into the axial hole 78 of the fixed ramp member 65 with the flange 123 side facing down, and the positioning convex part 128 is inserted into the through hole 120 and the escape concave part 99 while sliding. Mounted on the plate 121.

Next, as shown in FIG. 8B, the push rod biasing spring 161 is mounted on the flange portion 123 of the push rod 122 so that the screw shaft portion 124 of the push rod 122 is inserted inside.

Next, as shown in FIG. 8 (c), the cover member 160 has the long-position locking portion 175 and the short-position locking portion 176 on the lower side, and the screw shaft portion of the push rod 122 inside the side wall portion 166. 124 and the push rod urging spring 161 are inserted, and the screw shaft portion 124 of the push rod 122 is inserted so as to be inserted inside the ring-shaped bottom portion 165.

As described above, the ball 66, the moving ramp member 67, the sliding disc 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 are assembled in this order to the fixed ramp member 65, as shown in FIG. The phase of the long extending portion 171 is matched with the narrow portion 85 of the flange-shaped hole 79 of the fixed ramp member 65 shown in FIG. 4C, and the cover member 160 is pressed toward the fixed ramp member 65, and FIG. 6), the long position locking portion 175 of the long extension portion 171 shown in FIG. 6 is inserted into the narrow portion 85 shown in FIG. When the stop portion 175 is positioned below the locking protrusion 91, the cover member 160 is rotated relative to the fixed ramp member 65, and the long position locking portion 175 is locked and extended within the wide portion 86. Exit wall And it is positioned vertically lower side of the 90, to release the pressing.

Then, as shown in FIGS. 4C and 8C, the long-position locking portion 175 of the cover member 160 abuts on the locking extension wall portion 90 by the biasing force of the push rod biasing spring 161. . Due to the urging force of the push rod urging spring 161, the state in which the long position locking portion 175 of the long extending portion 171 of the cover member 160 is in contact with the locking extending wall portion 90 of the fixed ramp member 65 is maintained. The member 65 is locked in the bowl-shaped hole 79. In addition, as shown in FIG. 4C, the long position locking portion 175 has the cover member 160 fixed to the fixed ramp member in a state where the rotation is restricted by the locking protrusion 91 and the standing wall portion 89 of the fixed ramp member 65. 65 is attached. In this state, the phase of the short position locking portion 176 of the short extension portion 172 matches the phase of the narrow width portion 85 of the fixed ramp member 65, and the short position locking portion 176 of the short extension portion 172 is wide. Insertion into the narrow portion 85 becomes possible. In addition, in a state where the phase of the long position locking portion 175 of the long extension portion 171 is matched to the phase of the narrow width portion 85 so that the above attachment is possible, the short position locking portion 176 of the short extension portion 172 is set. Is adjusted to the phase of the standing wall portion 88 having a low height, and the height of the standing wall portion 88 is obtained by inserting the long position locking portion 175 of the long extension portion 171 into the narrow width portion 85 and the locking projection portion. The height is such that the short position locking portion 176 of the short extension portion 172 contacts after being positioned below 91.

Through the above-described actuator assembly process, the ball ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 are covered with the cover member 160 in the flange-shaped hole 79 of the side wall 72 of the fixed ramp member 65. The long position locking portion 175 is inserted and locked to be assembled in advance into a cartridge. Thus, the actuator assembly (disc brake actuator) shown in FIGS. 8C and 3 is composed of the ball ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161, and the cover member 160. 180 is assembled.

Next, an insertion step of inserting the actuator assembly 180, which is an assembly in the actuator assembly step, into the cylinder 18 of the caliper member 21 is performed. In this insertion step, the caliper member 21 shown in FIG. 2 is arranged with the cylinder bottom 16 facing downward, the locking pin 28 is fitted into the pin hole 27, and the collar 108 and the O-ring 109 are arranged in the central through hole 26. To do. Then, the actuator assembly 180 is inserted into the cylinder 18 of the caliper member 21 from the cylinder opening 17 with the shaft portion 95 side of the moving ramp member 67 at the head. At this time, the shaft portion 95 of the moving ramp member 67 is inserted inside the O-ring 109 and the collar 108 of the central through hole 26, and the stop pin 28 is inserted into the stop hole 74 of the fixed ramp member 65. As a result, the fixed ramp member 65 comes into contact with the cylinder bottom 16. As a result, the actuator assembly 180 is disposed in the cylinder 18. At this time, as shown in FIG. 9A, the short position locking portion 176 of the cover member 160 of the actuator assembly 180 is positioned at substantially the same position as the ring groove 36 of the cylinder tube portion 15.

Next, a locking process for mounting the retaining ring 162 to the cylinder 18 is performed. That is, the retaining ring 162 is inserted from the cylinder opening 17 shown in FIG. 2, and the short position locking portion 176 of the cover member 160 is pressed by the retaining ring 162 as shown in FIG. When the cover member 160 is pushed slightly toward the cylinder bottom 16 while the biasing spring 161 is contracted, the retaining ring 162 is fitted into the ring groove 36 and attached to the cylinder 18, and the cover member 160 is positioned at a short position. The stop 176 is locked. At this time, as shown in FIG. 4C, the short-position locking portion 176 is in phase with the narrow portion 85 of the fixed ramp member 65, and therefore enters the narrow portion 85. Interference with the fixed lamp member 65 is avoided, and the pushing-in of the cover member 160 is allowed. In this way, the actuator assembly 180 is prevented from being detached from the cylinder by the retaining ring 162.

As shown in FIG. 9B, the cover member 160 has the short position locking portion 176 locked to the retaining ring 162 by the above-described locking process of the retaining ring 162 to the cylinder 12. In this state, the long-position locking portion 175 is moved away from the locking extension wall portion 90 of the fixed ramp member 65 in the direction opposite to the retaining ring 162 (in the direction of the bottom portion 71 of the fixed ramp member 65). become. That is, in the above-described locking step, the long position locking portion 175 of the cover member 160 is fixed to the fixed ramp member from the locked state of the hook-shaped hole 79 of the fixed ramp member 65 and the long position locking portion 175 of the cover member 160. In this step, the cover member 160 is locked to the caliper member 21 via the retaining ring 162 by releasing the locking state between the long position locking portion 175 and the hook-shaped hole 79. As shown in FIG. 2, the cover member 160 is pressed against the retaining ring 162 by the urging force of the push rod urging spring 161 in such a state that the cover member 160 is locked to the caliper member 21 with the retaining ring 162. At the same time, the push rod 122 is pressed against the moving ramp member 67 of the ball ramp mechanism 62 through the sliding disk 121, the moving ramp member 67 is moved to the ball 66, the ball 66 is moved to the fixed ramp member 65, and the fixed ramp member 65 is moved to the cylinder. Each will be pressed against the bottom 16.

On the other hand, the clutch member 132 to which the clutch member seal 151 is attached is fitted to the piston 47, and the adjusting portion 155 is locked to the piston 47 by the retaining ring 156, so that the piston 47, the clutch member 132, and the adjusting portion 155 are engaged. Is another piston assembly 181.

In the caliper member 21, the piston seal 48 inserted from the cylinder opening portion 17 is fitted into the seal groove 39 of the cylinder cylinder portion 15, and one side of the boot 50 is fitted to the boot groove 40 of the cylinder 18. The piston assembly 181 is fitted into the sliding hole 38 of the cylinder cylinder portion 15 with the opening side of the piston 47 as the head, and the screw 131 of the actuator assembly 180 is screwed to the female screw 131 of the clutch member 132. The shaft portion 124 is screwed. Accordingly, the piston assembly 181 is disposed in the cylinder 18. Then, the other side of the boot 50 is fitted into the boot groove 49 of the piston 47.

Before and after this, the fitting groove of the moving ramp member 67 in which the shaft cover 111 is fitted inside the cylindrical portion 31 of the cylinder bottom portion 16 and the tip of the inner cover portion 116 projects from the cylinder bottom portion 16. 102. Then, after the operating member 112 is fitted into the serration 103 of the moving ramp member 67, the nut 113 is screwed into the male screw 104.

The caliper 14 is assembled as described above.

In the disc brake 10 having such a configuration, when a parking brake lever or a parking brake pedal (not shown) is operated, the operating member 112 rotates and the moving ramp member 67 of the ball ramp mechanism 62 rotates. The ball 66 is moved in the ramp groove 75 of the fixed ramp member 65, and is pushed by the ball 66 to move linearly. Then, the moving ramp member 67 moves the push rod 122 through the axial hole 78 of the fixed ramp member 65 fixed to the cylinder 18 while moving the slide portion 127 of the projection 125 of the protrusion 125. Move in the direction of. Then, the clutch member 132 moves integrally with the push rod 122 to move the piston 47 in the direction of the disk 12 and mechanically press the pair of pads 13 against the disk 12.

On the other hand, when the brake fluid pressure is introduced between the cylinder 18 and the piston 47 by a brake operation with a normal brake pedal, the fluid pressure acts on the piston 47 with respect to the pressure receiving area by the piston seal 48 and the direction of the disk 12 However, the hydraulic pressure also acts on the clutch member 132 with respect to the pressure receiving area by the clutch member seal 151 to generate a propulsive force in the direction of the disk 12. The piston 47 is pushed by moving in the axial direction without rotating by the screw clearance of the screw shaft portion 124 of the push rod 122.

When the brake fluid pressure is further introduced into the cylinder 18 and becomes equal to or higher than the predetermined fluid pressure, the clutch member 132 is pressed against the piston 47 by the fluid pressure acting on the clutch member 132, and the fluid pressure is applied to the piston 47. As a result, a driving force in the direction of the disk 12 is generated, and a hydraulic pressure is also applied to the clutch member 132 to generate a driving force in the direction of the disk 12.

Here, in order to advance and retract the rotatable clutch member 132 for pressing the piston 47, the push rod 122 having the screw shaft portion 124 screwed to the female screw 131 of the clutch member 132 is in a state in which the rotation is restricted. Therefore, the caliper member 21 needs to be provided. And in above-mentioned patent document 1, rotation of a push rod is stopped with the spring cover which covers a push rod energizing spring, this spring cover is fixed to a fixed lamp member, and is prevented from rotating. By preventing rotation with respect to the caliper member, the push rod is prevented from rotating with respect to the caliper member, and a total of three detents are required, which complicates the structure. In addition, since the push rod is prevented from rotating by a spring cover made of a plate material, there is a concern about durability as a rotation stopper. In addition, since the spring cover is provided with a push rod urging spring receiver and a push rod rotation stop mechanism, the spring cover needs a certain level of strength to receive the rotational force of the push rod. Since it is impossible to form a hole or the like for venting air in order to suppress the air, it is difficult for air to escape when filling the brake fluid.

On the other hand, according to the first embodiment, the push is performed while abutting each other in the rotation direction of the moving ramp member 67 between the fixed ramp member 65 and the push rod 122 of the ball ramp mechanism 62 and restricting the relative rotation. Since the rotation stop mechanism 130 that allows the linear movement of the rod 122 is provided, the push rod 122 is prevented from rotating by the rotation stop mechanism 130 and the fixed ramp member 65 (or the push rod 122) is prevented from rotating around the caliper member 21. By doing so, the push rod 122 and the fixed ramp member 65 can be prevented from rotating with respect to the caliper member 21 with a total of two detents, and the structure can be simplified.

Further, since the fixed ramp member 65, which is a thick hard member of the ball ramp mechanism 62, is provided with a rotation stop mechanism 130 that allows linear movement of the push rod 122 while restricting relative rotation, the spring cover is provided with Compared with a case where a push rod rotation stop mechanism is provided, durability as a rotation stop can be improved.

Further, according to the first embodiment, the ball ramp mechanism 62, the push rod 122, the push rod biasing spring 161 and the cover member 160 are inserted into the flanged hole 79 of the side wall portion 72 of the fixed ramp member 65. A step of assembling and assembling the actuator assembly 180 by inserting and locking the position locking portion 175, a step of inserting the actuator assembly 180 into the cylinder 18 of the caliper 14, and a step of mounting the retaining ring 162 on the cylinder 18 And the step of releasing the locking state between the long-position locking portion 175 of the cover member 160 and the hook-shaped hole 79 and locking the cover member 160 to the caliper 14 via the retaining ring 162. Can be simplified, and assembly work can be facilitated.

Further, according to the first embodiment, the protrusion 125 of the flange portion 123 of the push rod 122 is rotated by the moving ramp member 67 in the axial hole 78 formed in the side wall portion 72 of the fixed ramp member 65 of the ball ramp mechanism 62. The cover member 160 holds the push rod biasing spring 161 between the push rod 122 and the hook member 160 formed on the side wall portion 72 of the fixed ramp member 65. The push rod 122 and the push rod biasing spring 161 are connected to the ball ramp mechanism by inserting and locking a plurality of long position locking portions 175 disposed in the hole 79 on the outer periphery of the opening side at intervals in the circumferential direction. 62. In this way, if the fixed ramp member 65 (or push rod 122) that prevents the push rod 122 from rotating is prevented from rotating on the caliper member 21, the push rod 122 and the fixed ramp member 65 can be locked at a total of two positions. The caliper member 21 can be prevented from rotating, and the structure can be simplified.

In addition, a plurality of long-position locking portions 175 disposed on the outer periphery of the opening side at intervals in the circumferential direction are inserted and locked in the flange-shaped holes 79 formed in the side wall portion 72 of the fixed lamp member 65. Since the cover member 160 holds the push rod 122 and the push rod biasing spring 161 between the ball ramp mechanism 62, the cover member 160 does not need to be attached to the fixed ramp member 65 by caulking. The quality can be stabilized and the manufacturing cost can be reduced.

Further, the projection 125 of the push rod 122 is prevented from rotating in the rotational direction of the moving ramp member 67 by the axial hole 78 formed in the fixed ramp member 65, and the cover member 160 is pushed by the push rod biasing spring 161. The cover member 160 is inserted into and locked with the hook-shaped hole 79 formed in the fixed ramp member 65 while the cover member 160 is held between the push rod 122 and the push rod 122. The urging spring 161 is held between the ball ramp mechanism 62 and the urging spring 161. Therefore, the cover member 160 does not receive the rotational force of the push rod 122 and only receives the push rod biasing spring 161. Compared with the case where the cover member is provided with a push rod rotation stop mechanism, the

grooves

173 and 174 can be formed, and air can be easily released when the brake fluid is filled.

As mentioned above, although the detail of 1st Embodiment was demonstrated, the effect of 1st Embodiment is shown below.

According to the first embodiment, between the fixed ramp member 65 of the ball ramp mechanism 62 and the push rod 122, the axial hole 78 formed in the side wall portion 72 of the fixed ramp member 65 and the flange of the push rod 122. The protrusion 123 is formed in the portion 123 and enters the axial hole 78, and the push rod 122 is allowed to linearly move while restricting relative rotation by bringing them into contact with each other in the rotational direction of the moving ramp member 67. Since the rotation stop mechanism 130 is provided, if the push rod 122 is prevented from rotating with respect to the fixed ramp member 65 by the rotation stop mechanism 130 and the fixed ramp member 65 is prevented from rotating around the caliper member 21, a total of two places are provided. The push rod 122 can be prevented from rotating with respect to the caliper member 21 by preventing rotation, and the structure can be simplified.

Further, a rotation stop mechanism that allows linear movement of the push rod 122 while restricting relative rotation by allowing the protrusion 125 to enter the axial hole 78 of the fixed ramp member 65 made of a thick hard member of the ball ramp mechanism 62. Since 130 is configured directly, durability as a detent can be improved as compared with a case where a push rod rotation stop mechanism is provided in the spring cover. In addition, the cover member 160 only receives the push rod urging spring 161. Compared with the case where the cover member receives the push rod urging spring and the cover member is provided with a push rod detent mechanism, the air is not filled when the brake fluid is filled. It becomes easy to come off.

Further, the rotation stop mechanism 130 is formed on the protrusion 125 protruding in the outer diameter direction from the flange portion 123 that receives the pressing force of the moving ramp member 67 of the push rod 122 and the side wall portion 72 of the fixed ramp member 65, Since it comprises the axial hole 78 into which the projection 125 of the flange portion 123 is inserted, the push rod 122 can be prevented from rotating with respect to the fixed ramp member 65 with a simple structure.

Further, since the axial hole 78 is formed to extend from the opening side of the fixed ramp member 65 to the vicinity of the gap between the bottom 71 of the fixed ramp member 65 and the moving ramp member 67, the fixed ramp member is filled when the brake fluid is filled. Air between the moving lamp member 67 and the moving lamp member 67 is easily removed.

The cover member 160 formed in a cup shape holds the push rod biasing spring 161 between the push rod 122 and a plurality of long position locking portions 175 provided at intervals on the outer periphery of the opening side. The cover member 160 can be locked to the fixed ramp member 65 with a simple structure, and the push rod 122 is inserted and locked into the hook-shaped hole 79 formed in the side wall portion 72 of the fixed ramp member 65. The push rod urging spring 161 is held between the cover member 160 and the ball ramp mechanism 62 with a simple structure. Moreover, it is not necessary to attach the cover member 160 to the fixed lamp member 65 by caulking, so that the attachment quality is stabilized and the manufacturing cost can be reduced.

Further, in order to lock the long position locking portion 175 of the cover member 160 in the flange-shaped hole 79 formed in the radial direction after the axial hole is formed in the side wall portion 72 of the fixed ramp member 65, the cover member 160 and The cover member 160 can be easily locked to the fixed ramp member 65 by utilizing relative rotation with the fixed ramp member 65.

The hook-shaped hole 79 is formed so that the long position locking portion 175 can move in the direction of the bottom portion 71 of the fixed ramp member 65 from the locked state of the long position locking portion 175 of the cover member 160. Therefore, by moving the cover member 160 toward the bottom portion 71 of the fixed ramp member 65, the locked state of the cover member 160 to the fixed ramp member 65 can be released.

In addition, according to the first embodiment, the ball ramp mechanism 62 that converts the rotational motion of the operating member 112 into linear motion is configured, and the axial hole 78 is provided in the fixed ramp member 65 that is non-rotatably provided in the cylinder bottom portion 16. A protrusion 125 protruding in the outer diameter direction is provided on the flange portion 123 of the push rod 122 to which the clutch member 132 that contacts the piston 47 is screwed, and the axial hole 78 is a protrusion 125 of the flange portion 123 of the push rod 122. The push rod 122 is fixed in order to guide the push rod 122 to move in a linear motion while restricting the relative rotation between the fixed ramp member 65 and the push rod 122 by contacting with each other in the rotation direction of the moving ramp member 67. Rotation prevention by the projection 125 and the axial hole 78 with respect to the ramp member 65 and a fixed run In detent total two places with detent to the caliper member 21 of the member 65 may be detent against the caliper member 21, the structure can be simplified.

Further, the fixed ramp member 65 is fitted to the cylinder 18 by fitting the bottom portion 71 where the ramp groove 75 is formed, the side wall portion 72 where the axial hole 78 is formed, and the rotation pin 28 of the cylinder bottom portion 16. Therefore, the fixed ramp member 65 can be formed in a thick and hard shape.

Further, since the axial hole 81 of the bowl-shaped hole 79 is formed larger than the ball 66 and is disposed corresponding to the ramp groove 75, the ball 66 is inserted from the side through the axial hole 81. Thus, it can be put into the ramp groove 75 aligned in the circumferential direction, and the height difference from the ramp groove 75 at the time of throwing can be shortened to suppress jumping and the like.

A long-position locking portion 175 that is disposed in the radial hole 82 of the bowl-shaped hole 79 and can be locked to the side wall portion 72 of the fixed ramp member 65, and a long-position locking that is shifted from the long-position locking portion 175 in the circumferential direction. Since the short-position locking portion 176 formed on the ring-shaped bottom portion 165 side of the cover member 160 with respect to the portion 175 is provided, the short-position locking portion 176 is locked to the cylinder 18 by the retaining ring 162, thereby fixing the fixed lamp. The locking of the long position locking portion 175 that has been locked to the member 65 can be released.

Further, according to the first embodiment, the fixed ramp member 65, the ball 66, and the moving ramp member 67 of the ball ramp mechanism 62, the sliding disc 121, the push rod 122, the push rod biasing spring 161, and the cover member. 160 is assembled into the actuator assembly 180 by inserting and locking the long-position locking portion 175 of the cover member 160 into the hook-shaped hole 79 of the side wall portion 72 of the fixed ramp member 65, and the actuator assembly 180. Is inserted into the cylinder 18 of the caliper 14, the step of attaching the retaining ring 162 to the cylinder 18, the locking state of the long position locking portion 175 of the cover member 160 and the hook-shaped hole 79 is released, And a step of locking the cover member 160 to the caliper 14 via the retaining ring 162. Work can also be facilitated.

Further, in order to release the locked state by moving the long position locking portion 175 in the direction of the bottom portion 71 of the fixed ramp member 65 from the locked state of the hook-shaped hole 79 and the long position locking portion 175 of the cover member 160. By the step of locking the cover member 160 to the caliper 14 via the retaining ring 162, the locked state of the hook-shaped hole 79 and the long position locking portion 175 can be released.

In addition, the actuator assembly 180 assembles the ball 66, the moving ramp member 67, the sliding disc 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 in this order to the fixed ramp member 65, thereby fixing the fixed ramp member. 65 and the cover member 162 are rotated relative to each other so that the long-position locking portion 175 of the cover member 160 is locked in the bowl-shaped hole 79 of the side wall portion 72 of the fixed ramp member 65. Can be assembled.

Further, by providing the axial hole 79 and the bowl-shaped hole 79 in the side wall portion 72 of the fixed ramp member 65, the opening area of the side wall portion 72 can be widened, so that the air bleeding property when filling the brake fluid can be improved. .

Further, since the narrow groove 173 and the wide groove 174 are provided in the side wall portion 166 of the cover member 160, the cover member 160 can be easily locked to the assembling jig by using these. Can do. And since the opening area of the side wall part 166 can be enlarged by these, the air bleeding property at the time of brake fluid filling can be improved.
“Second Embodiment”
Next, a second embodiment will be described mainly based on FIGS. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

Also in the second embodiment shown in FIG. 10, between the fixed ramp member 65 of the ball ramp mechanism 62 and the push rod 122, the axial hole 78 formed in the side wall portion 72 of the fixed ramp member 65 and the push rod 122. And a protrusion 125 that enters the axial hole 78 and makes them abut against each other in the rotational direction of the moving ramp member 67, thereby restricting the relative rotation of the push rod 122. An allowable rotation stop mechanism 130 is provided.

In the second embodiment, a part of the fixed ramp member 65 of the ball ramp mechanism 62 and a part of the cover member 160 are different from the first embodiment.

The fixed ramp member 65 of the second embodiment is also formed by forging. As shown in FIG. 11, the bottom portion in which the through hole 73, the stop hole 74, and the ramp groove 75 are formed as in the first embodiment. 71 and a cup having a side wall 72 slightly different from that of the first embodiment, which rises from the outer peripheral edge of the bottom 71 to the axial direction side as a whole and has a constant cylindrical shape.

As in the first embodiment, the side wall 72 is formed with an axial hole 78 having a shape extending in the axial direction with a constant width in the circumferential direction and extending to the side opposite to the bottom 71. Further, flange-shaped holes (locking holes) 200 having a shape different from that of the first embodiment are formed at positions between all the axial holes 78 adjacent to each other in the circumferential direction of the side wall portion 72. The bowl-shaped holes 200 are also formed in the same number as the axial holes 78 (specifically, three places).

The bowl-shaped hole 200 has a shape in which holes are formed in the radial direction after the holes are formed in the axial direction. That is, an axial hole (hole) 201 formed from the side opposite to the bottom 71 of the side wall 72 to the front of the bottom 71 in the axial direction, and the axial hole 201 adjacent to the axial hole 201 in the circumferential direction. It consists of a radial hole (hole) 202 formed through in the radial direction in an intermediate portion in the axial direction. In other words, the axial hole 201 has a shape that extends away from the bottom 71 in the axial direction of the side wall 72, and the radial hole 202 does not escape to the side opposite to the bottom 71 in the axial direction of the side wall 72. It has a shape. The axial hole 201 is a wide portion 204 having a constant width that is wide in the circumferential direction from the end of the side wall 72 opposite to the bottom 71 to the position of the end of the radial hole 202 on the bottom 71 side. The bottom portion 71 side of the wide portion 204 is a narrow portion 205 having a constant width narrower in the circumferential direction.

By the

axial holes

201 and 202, the side wall portion 72 is formed with a standing wall portion 206 between the side opposite to the radial hole 202 of the axial hole 201 and the axial hole 78. A standing wall 207 is formed between the radial hole 202 side of the hole 201 and the axial hole 78.

The standing wall 206 has a wide wall 208 having a constant width that is wide in the circumferential direction, formed on the bottom 71 side, and a constant width that is narrow in the circumferential direction, formed on the side opposite to the bottom 71 of the wide wall 208. The narrow wall portion 209 has a narrow wall portion 209. The wide wall portion 208 and the narrow wall portion 209 have the same position on the axial hole 78 side, and the position on the axial hole 201 side is made different in a step shape. Is provided.

The standing wall portion 207 is formed on the bottom portion 71 side and has a wide wall portion 210 having a constant width that is wide in the circumferential direction, and a constant width portion having a narrow width in the circumferential direction that is formed on the opposite side of the bottom portion 71 of the wide wall portion 210. The narrow wall portion 211 and a locking extension wall portion 212 having a constant width wide in the circumferential direction formed on the opposite side of the bottom portion 71 of the narrow wall portion 211, and these wide wall portions 210. The narrow wall portion 211 and the locking extension wall portion 212 are provided so that the positions on the axial hole 78 side coincide with each other and the positions on the

axial holes

201 and 202 side are made different in steps.

The bottom surface of the axial hole 201, the top surfaces of the

wide wall portions

208 and 210, and the bottom surface of the locking extension wall portion 212 are parallel to the bottom surface of the bottom portion 71.

Here, in the fixed lamp member 65, the position of the bottom surface of the narrow portion 205 that is the end portion on the bottom portion 71 side of the bowl-shaped hole 200 is more than the position of the bottom surface that is the end portion on the bottom portion 71 side of the axial hole 78. Is also on the bottom 71 side. Further, in the fixed ramp member 65, the heights of the standing wall portion 206 and the standing wall portion 207 from the bottom portion 71 are the same.

As shown in FIG. 12, the cover member 160 has a ring-shaped bottom portion 165 similar to that of the first embodiment, and extends from the outer peripheral edge of the ring-shaped bottom portion 165 to one side in the axial direction. It has a cup shape with a slightly different side wall portion 166. The side wall portion 166 is mainly composed of a cylindrical base portion 230 that is connected to the ring-shaped bottom portion 165 and has a cylindrical shape with a certain length in the axial direction. There are a plurality (specifically, three locations) of locking portions 231 bent radially outward from the opposite side at equal positions in the circumferential direction. In other words, the locking portions 231 are arranged on the outer periphery on the opening side of the cover member 160 with a space therebetween, and are parallel to the ring-shaped bottom portion 165. The width of the locking portion 231 is slightly narrower than the width of the wide portion 204 of the bowl-shaped hole 200 of the fixed lamp member 65 shown in FIG.

As shown in FIG. 10, the cover member 160 is locked to the cylinder bottom portion 16 side of the retaining ring 162 held in the ring groove 36 of the cylinder tube portion 15 in the locking portion 231. As a result, the cylinder opening Movement in the direction of the portion 17 is restricted. Further, the cover member 160 has a locking portion 231 that can be inserted and locked into the bowl-shaped hole 200 of the fixed ramp member 65. Specifically, the locking portion 231 is locked to a locking extension wall portion 212 that forms the radial hole 202 of the bowl-shaped hole 200 of the fixed ramp member 65.

Also in the second embodiment, the ball ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 are assembled in advance into the cartridge and assembled into the caliper member 21. It will be.

That is, first, similarly to the first embodiment, the fixed ramp member 65 is disposed with the bottom portion 71 facing downward, the ball 66 is disposed in the ramp groove 75 of the bottom portion 71, and the moving ramp member 67 is disposed on the shaft portion 95. Is inserted into the through hole 73 of the fixed lamp member 65, and the disk portion 96 is mounted on the ball 66.

Next, after the sliding disc 121 is laid on the disc portion 96 of the moving ramp member 67, the slide portion 127 of the projection 125 is inserted into the axial hole 78 of the fixed ramp member 65 with the flange portion 123 side down. In addition, the push rod 122 is mounted on the sliding disc 121 while the positioning convex portion 128 is inserted into the through hole 120 and the escape concave portion 99, and the screw shaft portion 124 of the push rod 122 is inserted inside. The push rod biasing spring 161 is mounted on the flange portion 123 of the push rod 122.

Next, the cover member 160 is put on the push rod 122 and the push rod urging spring 161 with the locking portion 231 on the lower side.

Then, the phase of the locking portion 231 shown in FIG. 12 is matched with the wide portion 204 of the bowl-shaped hole 200 of the fixed ramp member 65 shown in FIG. While the urging spring 161 is contracted, the locking portion 231 is inserted into the wide portion 204, and when the locking portion 231 comes into contact with the bottom surface of the wide portion 204 and stops, the cover member 160 is rotated to As shown in FIG. 13A, the locking portion 231 is inserted into the radial hole 202 to release the pressure.

Then, as shown in FIG. 11 (b), the locking portion 231 is located between the locking extension wall portion 212 and the wide wall portion 210, that is, vertically below the locking extension wall portion 212. Due to the urging force of the push rod urging spring 161 shown in FIG. 10, the locking portion 231 comes into contact with the locking extension wall portion 212. Accordingly, the state in which the locking portion 231 is in contact with the locking extension wall portion 212 by the biasing force of the push rod biasing spring 161 is maintained, and the cover member 160 is attached to the fixed ramp member 65.

Through the above actuator assembly process, the ball ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161 and the cover member 160 are covered with the cover member 160 in the bowl-shaped hole 200 of the side wall 72 of the fixed ramp member 65. Is inserted into and locked in advance to be assembled into a cartridge. In this manner, the actuator assembly 180 including the ball ramp mechanism 62, the sliding disk 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 is assembled.

Next, an insertion step of inserting the actuator assembly 180, which is an assembly in the actuator assembly step, into the cylinder 18 of the caliper member 21 is performed. In this insertion step, as in the first embodiment, a rotation pin 28, a collar 108 and an O-ring 109 are arranged on the caliper member 21 arranged with the cylinder bottom 16 facing downward. Then, the actuator assembly 180 is inserted into the cylinder 18 of the caliper member 21. Also at this time, the shaft portion 95 of the moving ramp member 67 is inserted inside the O-ring 109 and the collar 108 of the central through hole 26, and the stop pin 28 is inserted into the stop hole 74 of the fixed ramp member 65. As a result, the fixed ramp member 65 comes into contact with the cylinder bottom 16. At this time, the engaging portion 231 of the cover member 160 of the actuator assembly 180 is positioned closer to the cylinder bottom 16 than the end of the ring groove 36 of the cylinder cylinder 15 on the cylinder bottom 16 side.

Next, a retaining ring locking process for attaching the retaining ring 162 to the cylinder 18 is performed. That is, the retaining ring 162 is inserted into the cylinder 18 from the cylinder opening 17 and is fitted into the ring groove 36. At this time, the retaining ring 162 and the cover member 160 of the actuator assembly 180 are separated from each other due to the positional relationship.

Next, the cover member 160 is released from the locking state of the locking portion 231 of the cover member 160 and the hook-shaped hole 200 of the fixed ramp member 65, and the cover member 160 is locked to the caliper member 21 via the retaining ring 162. A locking process is performed. That is, the cover member 160 of the actuator assembly 180 is rotated while being slightly pressed toward the cylinder bottom 16 side, so that the locking portion 231 is pivoted from the radial hole 202 of the fixed ramp member 65 as shown in FIG. By moving the directional hole 201 toward the wide portion 204, the directional hole 201 is released from the locking extension wall portion 212, that is, the bowl-shaped hole 200, and the locking state is released. When the pressing is released when the locking portion 231 comes into contact with the narrow wall portion 209 of the standing wall portion 206, the cover member 160 causes the locking portion 231 to be fixed to the fixed ramp member by the biasing force of the push rod biasing spring 161. The cover member is stopped by moving to the opposite side of the cylinder bottom 16 while moving within the wide portion 204 of 65 and bringing the locking portion 231 into contact with the retaining ring 162 as shown in FIG. As a result, the retaining ring 162 fitted in the ring groove 36 latches the locking portion 231 of the cover member 160. As a result, the locking portion 231 of the cover member 160 is detached from the fixed ramp member 62 and the cover member 160 is detached from the fixed ramp member 62, and the actuator assembly 180 is prevented from being detached from the cylinder by the retaining ring 162. It becomes.

In this state, the cover member 160 is pressed against the retaining ring 162 by the biasing force of the push rod biasing spring 161, and the push rod 122 is pressed against the moving ramp member 67 of the ball ramp mechanism 62 via the sliding disk 121. The moving ramp member 67 is pressed against the ball 66, the ball 66 is pressed against the fixed ramp member 65, and the fixed ramp member 65 is pressed against the cylinder bottom 16.

After that, as in the first embodiment, the piston seal 48 is fitted into the seal groove 39 of the cylinder tube portion 15 and one side of the boot 50 is fitted into the boot groove 40 of the cylinder 18 before the piston assembly. 181 is fitted into the cylinder tube portion 15, and the screw shaft portion 124 of the push rod 122 of the actuator assembly 180 is screwed into the female screw 131 of the clutch member 132. Then, the other side of the boot 50 is fitted into the boot groove 49 of the piston.

According to the disc brake 10 of the second embodiment, as in the first embodiment, the fixed ramp member 65 of the ball ramp mechanism 62 and the push rod 122 are in contact with each other in the rotational direction of the moving ramp member 67. Since the rotation stop mechanism 130 that allows the linear motion of the push rod 122 while restricting the relative rotation is provided, the push rod 122 is prevented from rotating with respect to the fixed ramp member 65 by the rotation stop mechanism 130, thereby fixing the fixed ramp. If the member 65 is prevented from rotating on the caliper member 21, the push rod 122 can be prevented from rotating with respect to the caliper member 21 with a total of two detents, and the structure can be simplified.

Further, according to the manufacturing method of the disc brake 10 of the second embodiment, the ball ramp mechanism 62, the push rod 122, the push rod biasing spring 161 and the cover member 160 are connected to the bowl-shaped hole of the side wall portion 72 of the fixed ramp member 65. 200 is assembled by inserting and locking the locking portion 231 of the cover member 160 into the actuator assembly 180, the actuator assembly 180 is inserted into the cylinder 18 of the caliper 14, and the retaining ring is attached to the cylinder 18. 162, and a step of releasing the locking state between the locking portion 231 of the cover member 160 and the hook-shaped hole 200 and locking the cover member 160 to the caliper 14 via the retaining ring 162. Therefore, the structure can be simplified and the assembling work can be facilitated.

Further, according to the actuator assembly 180 of the second embodiment, the protrusion 125 of the flange portion 123 of the push rod 122 is moved to the axial hole 78 formed in the side wall portion 72 of the fixed ramp member 65 of the ball ramp mechanism 62. The cover member 160 holds the push rod biasing spring 161 between the push rod 122 and the side wall 72 of the fixed ramp member 65 while the member 67 is in contact with the rotation direction of the member 67 and is prevented from rotating. The push rod 122 and the push rod biasing spring 161 are moved by inserting and locking a plurality of locking portions 231 disposed on the outer periphery of the opening side at intervals in the circumferential direction in the formed bowl-shaped hole 200. It is held between the ball ramp mechanism 62. In this way, if the fixed ramp member 65 that prevents the push rod 122 from rotating is prevented from rotating on the caliper member 21, the push rod 122 can be prevented from rotating relative to the caliper member 21 by a total of two detents. And the structure can be simplified.

In addition, by inserting and locking a plurality of locking portions 231 arranged at intervals in the circumferential direction on the opening side outer periphery in the flange-shaped hole 200 formed in the side wall portion 72 of the fixed lamp member 65, Since the cover member 160 holds the push rod 122 and the push rod biasing spring 161 with the ball ramp mechanism 62, it is not necessary to attach the cover member 160 to the fixed ramp member 65 by caulking, and the attachment quality is improved. In addition to being stable, the manufacturing cost can be reduced.

Further, the projection 125 of the push rod 122 is prevented from rotating in the rotational direction of the moving ramp member 67 by the axial hole 78 formed in the fixed ramp member 65, and the cover member 160 is pushed by the push rod biasing spring 161. The push rod 122 and the push rod biasing spring 161 are moved by inserting and locking the locking portion 231 in the hook-shaped hole 200 formed in the fixed ramp member 65 while holding the push rod 122 between the push rod 122 and the push rod 122. Since the cover member 160 only receives the push rod urging spring 161 to be held between the ball ramp mechanism 62 and the cover member receives the push rod urging spring, the cover member is provided with a push rod detent mechanism. Compared to the above, air is easier to escape when filling the brake fluid.

As mentioned above, although the detail of 2nd Embodiment was demonstrated, the effect of 2nd Embodiment is shown below.

According to the second embodiment, the cover member 160 formed in a cup shape holds the push rod urging spring 161 between the push rod 122 and a plurality of openings provided on the opening side outer periphery at intervals. Since the locking portion 231 is inserted and locked into the hook-shaped hole 200 formed in the side wall portion 72 of the fixed ramp member 65, the cover member 160 can be locked to the fixed ramp member 65 with a simple structure. The push rod 122 and the push rod biasing spring 161 are held between the cover member 160 and the ball ramp mechanism 62 with a simple structure. Moreover, it is not necessary to attach the cover member 160 to the fixed lamp member 65 by caulking, so that the attachment quality is stabilized and the manufacturing cost can be reduced.

Further, since the locking portion 231 of the cover member 160 is locked in the flange-shaped hole 200 formed in the radial direction after the axial hole is formed in the side wall 72 of the fixed lamp member 65, the cover member 160 and the fixed lamp The cover member 160 can be easily locked to the fixed ramp member 65 by utilizing the relative rotation with the member 65.

Further, according to the second embodiment, the fixed ramp member 65, the ball 66, and the moving ramp member 67 of the ball ramp mechanism 62, the sliding disc 121, the push rod 122, the push rod biasing spring 161, and the cover member. 160 is assembled into the actuator assembly 180 by inserting and locking the locking portion 231 of the cover member 160 into the hook-shaped hole 200 of the side wall 72 of the fixed ramp member 65, and the actuator assembly 180 is calipered. 14, inserting the retaining ring 162 into the cylinder 18, releasing the locking state between the locking portion 231 of the cover member 160 and the hook-shaped hole 200, Through which the cover member 160 is locked to the caliper 14, the structure can be simplified and the assembly work can be performed. It is possible to squid.

Further, the cover member 160 of the actuator assembly 180 is rotated, and the locking portion 231 is released from the radial hole 202 of the flange-shaped hole 200 of the fixed ramp member 65 to release the locking state. The retaining ring 162 can be mounted in the ring groove 36 of the cylinder 18 before the retaining portion 231 is detached from the bowl-shaped hole 200, and this mounting operation can be facilitated.

In addition, the actuator assembly 180 assembles the ball 66, the moving ramp member 67, the sliding disc 121, the push rod 122, the push rod biasing spring 161, and the cover member 160 in this order to the fixed ramp member 65. 65 and the cover member 162 are rotated relative to each other so that the locking portion 231 of the cover member 160 is locked in the hook-shaped hole 200 of the side wall portion 72 of the fixed ramp member 65, so that the actuator assembly 180 is more easily assembled. Can do.
“Third Embodiment”
Next, a third embodiment will be described mainly based on FIGS. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

Also in the third embodiment shown in FIG. 14, between the fixed ramp member 65 and the push rod 122 of the ball ramp mechanism 62, the axial hole 78 and the push rod 122 formed in the side wall portion 72 of the fixed ramp member 65. And a protrusion 125 that enters the axial hole 78 and makes them abut against each other in the rotational direction of the moving ramp member 67, thereby restricting the relative rotation of the push rod 122. An allowable rotation stop mechanism 130 is provided.

And in 3rd Embodiment, the structure which stops the fixed ramp member 65 with respect to the caliper member 21 differs from 1st Embodiment. That is, in the first embodiment, the pin hole 27 of the cylinder bottom portion 16, the stop pin 28, and the stop hole of the fixed lamp member 65 provided to prevent the fixed lamp member 65 from rotating with respect to the caliper member 21. 74 is not provided in the third embodiment. Instead, as shown in FIG. 15, there is a stop groove 240 which is recessed radially outwardly in the inner peripheral portion of the fitting hole 35 of the cylinder tube portion 15 and extends in the axial direction to come out to the intermediate hole 37 side. A plurality of (specifically, three locations) are formed at equal intervals in the circumferential direction, and the slide portion 127 of the projection 125 constituting the rotation stop mechanism 130 of the push rod 122 shown in FIG. 78 is slidably fitted to 78 and is also slidably fitted to the non-rotating groove 240 of the caliper member 21 at a non-rotating convex portion 241 that protrudes radially outward from the fixed ramp member 65.

That is, the protrusion 125 protruding in the outer diameter direction from the flange portion 123 of the push rod 122 enters the axial hole 78 formed in the side wall portion 72 of the fixed ramp member 65 at the slide portion 127. As a result, the slide portion 127 of the protrusion 125 abuts on the axial hole 78 in the rotational direction of the moving ramp member 67 and moves along the axial hole 78 while restricting relative rotation with the axial hole 78. become. As a result, the push rod 122 is allowed to move linearly in the axial direction in a state where the relative rotation with respect to the fixed ramp member 65 is restricted. At the same time, the anti-rotation convex portion 241 of the protrusion 125 enters the anti-rotation groove 240 formed in the cylinder tube portion 15, and the anti-rotation convex portion 241 moves into the anti-rotation groove 240. It moves along the stop groove 240 while abutting in the rotation direction 67 and restricting relative rotation with the stop groove 240. Thereby, the push rod 122 is allowed to move in the axial direction in a state where the relative rotation with respect to the cylinder 18 is restricted. That is, the protrusion 125 protruding in the outer diameter direction from the flange portion 123 that receives the pressing force of the moving ramp member 67, the axial hole 78 of the fixed ramp member 65, and the stop groove 240 of the cylinder 18 are While permitting the direction movement, the rotation direction of the push rod 122 with respect to the cylinder 18 is restricted, and the rotation direction of the fixed ramp member 65 with respect to the cylinder 18 is also restricted.

In the third embodiment, in the assembling process of inserting and assembling the actuator assembly 180, which is an assembly in the same actuator assembling process as in the first embodiment, into the cylinder 18 of the caliper member 21, the caliper member 21 is attached to the cylinder bottom portion 16. The collar 108 and the O-ring 109 are disposed in the central through hole 26. Then, the actuator assembly 180 is inserted into the cylinder 18 of the caliper member 21 from the cylinder opening 17 with the shaft portion 95 side of the moving ramp member 67 at the head. At this time, the shaft portion 95 of the moving ramp member 67 is inserted inside the O-ring 109 and the collar 108 of the central through hole 26, and the rotation of the slide portion 127 protruding in the radial direction from the fixed ramp member 65 of the push rod 122 is stopped. The convex portion 241 is inserted into the rotation stop 240 of the cylinder 18 so that the fixed ramp member 65 is brought into contact with the cylinder bottom portion 16. The subsequent steps are the same as in the first embodiment.

In the disc brake 10 of the third embodiment having such a configuration, when a parking brake lever (not shown) or a parking brake pedal (not shown) is operated, the operating member 112 rotates and the moving ramp member 67 of the ball ramp mechanism 62 rotates. The moving ramp member 67 of the ball ramp mechanism 62 moves the ball 66 in the ramp groove 75 of the fixed ramp member 65, whereby the moving ramp member 67 is pushed by the ball 66 and moves linearly. Then, the moving ramp member 67 is pushed while moving the slide portion 127 of the projection 125 by the axial hole 78 of the fixed ramp member 65 and the rotation projection 241 of the projection 125 by the rotation groove 240 of the cylinder 18. The rod 122 is moved in the direction of the disk 12 without rotating with respect to the cylinder 18. Then, the clutch member 132 moves integrally with the push rod 122 to move the piston 47 in the direction of the disk 12 and mechanically press the pair of pads 13 against the disk 12.

The details of the third embodiment have been described above. The operational effects of the third embodiment will be described below.

A protrusion 125 protruding in the outer diameter direction from the flange portion 123 of the push rod 122 is inserted into an axial hole 78 formed in the side wall portion 72 of the fixed ramp member 65 to prevent the push rod 122 from rotating with respect to the fixed ramp member 65. The rotation stop mechanism 130 is configured, and the cylinder 18 is also restricted in the rotational direction. Accordingly, since a stop pin is not required, the number of parts can be reduced, and a pin hole is formed in the cylinder bottom portion 16, a stop pin is fitted into the pin hole, and a stop hole is formed in the fixed ramp member 65. Therefore, the manufacturing cost can be reduced. In addition, as compared with the case where the rotation stop hole of the fixed ramp member 65 is fitted to the rotation stop pin of the cylinder bottom portion 16, the visual positioning is relatively easy, and the assembly work can be facilitated.

10 disc brake; 12 disc; 13 pad; 14 caliper; 16 cylinder bottom (bottom); 18 cylinder; 21 caliper member; 47 piston; 62 ball ramp mechanism; 65 fixed ramp member; 66 ball; 67 moving ramp member; 71 bottom 72 side wall portion; 74 stop hole (regulation portion, fixed portion); 75 ramp groove; 78 axial hole (axial hole); 79, 200 bowl-shaped hole (locking hole); 81 axial hole (first) 82; radial hole (second hole); 112 operating member; 122 push rod; 123 flange portion; 124 screw shaft portion (screw portion); 125 protrusion; 130 rotation mechanism; 132 clutch member; 161 push Rod biasing spring (Push rod urging member); 162 retaining ring; 160 cover member; 175 long position locking portion (locking portion, first locking portion); 176 short position locking portion (locking portion, second locking portion) 180 actuator assembly (disc brake actuator); 201 axial hole (hole); 202 radial hole (hole); 231 locking part

Claims

A caliper that slidably fits a piston into a bottomed cylindrical cylinder and presses a pair of pads against the disk by sliding the piston;
A fixed ramp member provided at the bottom of the cylinder in a non-rotatable manner, a moving ramp member coupled to an operating member that receives rotational input and rotating in response to the rotation of the operating member, and these fixed ramp members; A ball ramp mechanism having a ball provided between the moving ramp member;
A push rod having a threaded portion for receiving a linear pressing force of the moving ramp member and screwing a clutch member that transmits the linear pressing force of the moving ramp member to the piston;
A push rod biasing member that biases the push rod toward the ball ramp mechanism;
A cover member for holding the push rod biasing member with the push rod,
Between the fixed ramp member and the push rod is provided a rotation stop mechanism that allows linear movement of the push rod while abutting each other in the rotational direction of the moving ramp member and restricting relative rotation,
The disc brake according to claim 1, wherein the locking portion of the cover member is insertable / lockable.
The push rod has a flange portion that receives the direct-acting pressing force of the moving ramp member, and a protrusion that protrudes from the flange portion in the outer diameter direction,
The fixed ramp member includes a bottom portion in which a lamp groove is formed, a side wall portion in which an axial hole into which a projection of the flange portion is inserted is formed, and a restriction portion that restricts the rotation direction with respect to the cylinder. Have
The disc brake according to claim 1, wherein the anti-rotation mechanism includes the protrusion and the axial hole.
3. The disc brake according to claim 2, wherein the axial hole is formed to extend from the opening side of the fixed ramp member to the vicinity of the gap between the bottom of the fixed ramp member and the moving ramp member. .
2. The disc brake according to claim 1, wherein the fixed ramp member is formed with a bowl-shaped hole into which a locking portion of the cover member can be inserted and locked.
5. The disc brake according to claim 4, wherein the bowl-shaped hole is formed larger than the ball and is arranged corresponding to the ramp groove.
The plurality of locking portions include a first locking portion that is disposed in the second hole of the bowl-shaped hole and can be locked to a side wall portion of the fixed lamp member, and a periphery from the first locking portion. 5. The disc brake according to claim 4, further comprising a second locking portion that is shifted in a direction and is formed closer to the bottom side of the cover member than the first locking portion.
5. The disc brake according to claim 4, wherein the hook-shaped hole accommodates the locking portion of the cover member so as to be movable from the locked state toward the bottom portion of the fixed ramp member. .
5. The disk according to claim 4, wherein the fixed lamp member and the cover member are rotated relative to each other, and the locking portion of the cover member is locked in the bowl-shaped hole of the side wall portion of the fixed lamp member. brake.
The cover member is formed in a cup shape and is provided with a plurality of locking portions arranged at intervals on the outer periphery of the opening side,
The said bowl-shaped hole has the 1st hole formed in the axial direction, and the 2nd hole formed in the radial direction succeeding to this 1st hole, It is characterized by the above-mentioned. Disc brake as described.