JP2007177995A - Disc brake actuator provided with parking operation mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for preventing a camshaft 32 from coming off simply by effecting a normal parts-assembly works without providing specified parts for coming-off prevention. <P>SOLUTION: A parking operation mechanism is made up of an adjusting spindle 26a of an adjuster mechanism 26, and a camshaft 32 having a parking lever 30 at one end to give an axial thrust to the adjusting spindle 26a by rotation. The adjusting spindle 26a pushes a first roller plug 34 to the camshaft 32 by means of a first rolling roller 36 on the spring force of a spring 26d acting on a holder 48 engaged with the adjusting spindle 26a. The camshaft 32 is prevented from coming off by engagement of both end-faces of the first rolling roller 36, the end inner face of the holder 48, and the end inner face of cam grooves 32a, 32b formed in the camshaft 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disc brake operating device having a parking operation mechanism on one end side of a caliper that slidably supports a piston incorporating an adjuster mechanism.

  Conventionally, a camshaft is arranged in a direction orthogonal to the adjustment spindle as a rotation-linear motion conversion part of the parking operation mechanism of the disc brake operating device, and the camshaft interlocked with the parking lever is rotated. There has been known one in which an axial thrust is applied to an adjustment spindle by a thrust rod engaged with a formed cam groove (see, for example, Patent Document 1). In such a conventional disc brake operating device, as shown in FIG. 11, one end of the thrust rod 2 is engaged with a cam groove 1a formed in the camshaft 1, and the other end of the thrust rod 2 is the adjusting spindle 3. Is in contact with a groove 3a provided at the end of the groove. A parking lever 5 connected to a brake operation cable is fixed to the protruding portion 1 b protruding from the cam shaft hole 4 of the camshaft 1. The outer periphery on the front end side of the protruding portion 1b of the camshaft 1 is surrounded by a return spring 6. One end of the return spring 6 is engaged with the parking lever 5, and the other end is engaged with a stop pin 8 erected on the caliper 7. ing. The stop pin 8 is provided with a plate-shaped presser spring 9 and urges the camshaft 1 toward the bottom of the camshaft hole 4. Therefore, even if the camshaft 1 is about to come out of the camshaft hole 4, the camshaft 1 is pressed by the pressing spring 9 to prevent the camshaft 1 from falling off.

  When used as a parking brake while the vehicle is stopped, the parking lever 5 rotates the camshaft 1 and the thrust rod 2 presses the adjusting spindle 3 to drive a piston (not shown) by operating the brake operation cable. Then, the friction pad is pressed against the rotor, and a braking force as a parking brake can be applied to the vehicle. When the operation of the brake operation cable is released, the camshaft 1 is returned to the initial position by the return spring 6 and the brake action is released.

JP-A-9-25971 (paragraphs 0011 to 0013, paragraph 0018, FIG. 9)

  The conventional rotation / linear motion converting portion described in Patent Document 1 requires a plate-shaped holding spring 9 to prevent the camshaft 1 from falling off, and is assembled in a narrow gap between the camshaft 1 and the stop pin 8. In other words, the assembly work takes time and effort.

  The present invention has been made paying attention to such problems, and prevents the camshaft from falling off in the normal part assembly process without preparing a special part to prevent the camshaft from falling off. It is an object of the present invention to provide a disc brake actuating device having a parking operation mechanism that can be used.

  In order to solve the above-mentioned problems, a disc brake actuating device having a parking operation mechanism according to claim 1 of the present invention is provided on one end side of a caliper that slidably supports a piston incorporating an adjuster mechanism. In the disc brake actuating device provided with a parking operating mechanism, the operating mechanism includes an adjusting spindle of the adjuster mechanism, a camshaft orthogonal to the adjusting spindle and having a parking lever at one end, and adjusting the camshaft. A rotation-linear motion conversion unit disposed between the spindle and the camshaft that applies axial thrust to the adjustment spindle by the rotation of the camshaft. The rotation / linear motion conversion unit includes a first roller plug in contact with and engaging with the adjusting spindle, and a cam groove in the cam shaft that rotates between the cam shaft and the first roller plug while rotating. A first rolling roller held on the camshaft, a second roller plug abutting and engaging the caliper housing, and a cam groove on the camshaft that rolls between the camshaft and the second roller plug while rotating. It is comprised with the 2nd rolling roller hold | maintained inside. Further, due to the spring force of the spring acting on the holder engaged with the adjustment spindle, the adjustment spindle presses the first roller plug to the camshaft side via the first rolling roller, and the holder has an inner surface at its end. The positions of both ends of the first rolling roller are restricted in the axial direction.

  According to a second aspect of the present invention, there is provided a disc brake actuating device having the parking operation mechanism according to claim 2, wherein the disc brake actuating device has the parking operation mechanism according to claim 1, wherein the holder Has a substantially hat-shaped cross section, and a hook portion that holds one end of the spring is formed on one side, and a locking portion that engages with the adjusting spindle is formed on the other side.

  According to a third aspect of the present invention, there is provided a disc brake actuating device having the parking operation mechanism according to claim 3, wherein the disc has the parking operation mechanism according to any one of claims 1 to 2. The brake operating device, wherein the first and second rolling rollers are partially accommodated in a cam groove formed in a cam shaft in a state where each of the first and second rolling rollers is arranged in the vertical direction. The position of the lower end surface of the roller is regulated in the axial direction by a roller support ring provided on the camshaft.

  According to a fourth aspect of the present invention, there is provided a disc brake actuating device having the parking operation mechanism according to claim 4, wherein the disc has the parking operation mechanism according to any one of claims 1 to 3. A brake operating device, wherein the first roller plug includes one substrate portion and a pair of sliding blade portions, and the first roller plug is disposed on one surface of the substrate portion with respect to the axial direction of the adjustment spindle. A cam surface is formed in which the rolling roller is brought into rolling contact and the depth in the axial direction is gradually changed in the width direction of the substrate portion. Further, the pair of sliding blade portions are bent at right angles from one end in the width direction of the substrate portion toward one side in the axial direction. The second roller plug uses a member having the same shape as the first roller plug in a state where the axial direction and the width direction are reversed from those of the first roller plug. Then, the first roller plug and the second roller plug are made to face each other on one side of the substrate part on which the cam surface is formed, and the sliding blade parts are arranged in the width direction of the substrate part. Are combined in a state of being superimposed on each other.

  According to a fifth aspect of the present invention, there is provided a disc brake actuating device comprising the parking operation mechanism according to claim 5, wherein the disc brake actuating device comprises the parking operation mechanism according to claim 4, wherein An engaging projection formed on the other side of the substrate portion of the first and second roller plugs at a portion deviating from the center of the substrate portion, and a portion where the substrate portion of the first roller plug abuts on the inner surface of the caliper housing The first and second roller plugs are positioned based on engagement with an engagement recess formed in the head of the adjustment spindle.

  According to a sixth aspect of the present invention, there is provided a disc brake actuating device having the parking operation mechanism according to claim 6, wherein the disc has the parking operation mechanism according to any one of claims 1 to 3. A brake operating device, wherein the first roller plug includes one first substrate portion and a pair of first sliding blade portions, and the first substrate portion of the first substrate portion with respect to the axial direction of the adjustment spindle. A first cam surface is formed on one surface, which causes the first rolling roller to be in rolling contact with each other and gradually change the depth in the axial direction in the width direction of the first substrate portion. Further, the pair of first sliding wing portions are bent at right angles from both ends in the width direction of the first substrate portion toward one side in the axial direction. The second roller plug includes one second substrate portion and a pair of second sliding blade portions. The first roller plug has a first surface on one side of the second spindle portion in the axial direction of the adjustment spindle. The second rolling roller is brought into rolling contact with one surface of the substrate portion, and the depth in the axial direction is gradually changed in the direction opposite to the first cam surface in the width direction of the second substrate portion. A second cam surface is formed. Further, the pair of second sliding blade portions are bent at right angles to a direction approaching the first roller plug from one end in the width direction to both ends in the width direction of the second substrate portion. The interval between the outer surfaces of the second sliding blades is equal to or less than the interval between the inner surfaces of the pair of first sliding blades. Then, the first roller plug and the second roller plug are made to face each other on each of the substrate portions forming the cam surface, and the first and second sliding blade portions are The first and second substrate portions are combined in a state of being overlapped with each other in the width direction.

  Furthermore, of the present invention, a disc brake actuating device having the parking operation mechanism according to claim 7 is the disc brake actuating device having the parking operation mechanism according to claim 6, wherein An engaging protrusion formed on the other side surface of the first substrate portion of the one roller plug at a portion deviating from the center of the first substrate portion, and the first substrate portion of the first roller plug is protruded by the inner surface of the caliper housing. The first roller plug is positioned based on the engagement with the engaging recess formed in the contact portion, and the inner surface of the pair of first sliding blades and the pair of second sliding blades The second roller plug is positioned based on the engagement.

  According to a first aspect of the present invention, the disc brake actuating device having the parking operation mechanism according to the first aspect of the present invention is configured to press the adjusting spindle toward the camshaft side through the first roller plug and the first rolling roller. Since the position of both ends of the first rolling roller is regulated in the axial direction on the inner surface of the end portion of the holder, which serves as a spring receiving portion to be used, the first pull-out preventing part is not prepared, and the first Of the camshaft holding the rolling roller in the cam groove is prevented. Therefore, it is possible to prevent the camshaft from dropping in a normal part assembling process without preparing a special part for preventing the camshaft from falling off.

  According to a second aspect of the present invention, there is provided a disc brake actuating device comprising the parking operation mechanism according to the second aspect of the present invention. The holding function of the first rolling roller can be achieved.

  According to a third aspect of the present invention, there is provided a disc brake actuating device comprising the parking operation mechanism according to the third aspect, wherein the lower end surfaces of the first and second rolling rollers provided on the camshaft are positioned in the axial direction. The regulating roller support ring can prevent the first rolling roller from coming out of the cam shaft and the cam shaft from coming out to the parking lever side.

  According to a fourth aspect of the present invention, there is provided the disc brake actuating device having the parking operation mechanism according to the fourth aspect, wherein the first roller plug and the second roller plug are connected to each other in the same direction. It can be used in reverse. For this reason, it is possible to reduce the cost by simplifying the production of parts and the management of parts while keeping the types of parts small.

  According to a fifth aspect of the present invention, there is provided a disc brake actuating device including the parking operation mechanism according to the fifth aspect of the present invention, by reliably positioning the first roller plug and the second roller plug. It is possible to stabilize the operation state.

  According to a sixth aspect of the present invention, the disc brake actuating device having the parking operation mechanism according to the sixth aspect constitutes the second roller plug that is displaced in the axial direction of the adjusting spindle when the parking brake is actuated. None of the pair of second sliding wings is in sliding contact with the inner surface of the caliper housing. For this reason, even when the caliper housing is made of a lightweight but relatively soft metal material such as an aluminum alloy, it is possible to prevent the inner surface of the caliper housing from being worn.

  Furthermore, in the present invention, the disc brake actuating device provided with the parking operation mechanism according to claim 7 can ensure the positioning of the first roller plug and the second roller plug, thereby enabling the parking mechanism. It is possible to stabilize the operation state.

[First example of embodiment]
FIGS. 1-8 has shown the 1st example of embodiment of this invention corresponding to the invention of Claims 1-5. As shown in FIG. 1, the disc brake operating device of this example includes a fluid-operated service brake mechanism (SM) including a caliper 20 and a piston assembly 22 and a parking operation mechanism (PM). The piston assembly 22 includes a piston 24 that receives fluid pressure when the service brake is applied and slides within the caliper 20, and an adjuster mechanism 26 for compensating brake pad wear and preventing over-adjustment. The caliper 20 is slidably supported with respect to the fixed support 28.

  As the adjuster mechanism 26, a conventionally known reversible screw type is used. The reversible screw type adjuster mechanism 26 includes an adjustment spindle 26a having a reversible screw, an adjustment sleeve 26b screwed to the spindle 26a, a bearing 26c for supporting the rotation of the adjustment sleeve 26b, a spring 26d, and the like. The If the wear of the brake pads 29, 29 exceeds a specified value, the adjustment sleeve 26b moves forward with respect to the adjustment spindle 26a, and the retracted position of the piston 24 advances when the brake is released, and the brake pads 29, 29 are worn. Is compensated.

  If excessive brake fluid pressure is applied to the piston 24, the adjustment spindle 26a moves forward together with the adjustment sleeve 26b against the spring force of the spring 26d, so that the adjustment sleeve 26b rotates relative to the adjustment spindle 26a. It cannot move and over-adjustment is prevented.

  The parking operation mechanism (PM) includes a parking lever 30, a camshaft 32, and a rotation-linear motion converter. The parking lever 30 is operated by a brake wire, and the central axis XX (FIG. 2) of the adjustment spindle 26a. When the camshaft 32 arranged so as to be orthogonal to the reference) rotates, the rotation-linear motion conversion unit operates. The rotation / linear motion conversion unit is held in a cam groove 32a that rolls between the first roller plug 34 that engages with the adjustment spindle 26a and the camshaft 32 and the first roller plug 34 while rotating. The first rolling roller 36 and the housing 38 connected to the end of the caliper 20 on the side opposite to the rotor (the right end in FIG. 1) (the caliper 20 may have a structure including the housing 38) are uneven. The second roller plug 40 to be joined, and the second rolling roller 42 held in the cam groove 32b that rolls between the cam shaft 32 and the second roller plug 40 while rotating. . Note that the first rolling roller 36 and the second rolling roller 42 are arranged symmetrically with respect to the center of the camshaft 32.

  In addition, the first roller plug 34 and the second roller plug 40 are assembled with members having the same shape in a state where the axial direction and the width direction are reversed. That is, the first roller plug 34 includes a single substrate portion 61 and a pair of sliding wing portions 35a and 35b. A cam surface 62 is formed on one surface of the substrate portion 61 with respect to the axial direction of the adjustment spindle 26a. The cam surface 62 is for rolling contact with the first rolling roller 36, and the depth in the axial direction is gradually changed in the width direction of the substrate portion 61 (vertical direction in FIG. 1). Yes. The pair of sliding blade portions 35a and 35b are bent at right angles from both ends in the width direction of the substrate portion 61 toward one axial side (the right side in FIG. 1).

  On the other hand, the second roller plug 40 has a member having the same shape as that of the first roller plug 34 assembled in the housing 38 with the axial direction and the width direction reversed from those of the first roller plug 34. . That is, in a state where the first roller plug 34 and the second roller plug 40 are assembled between the head portion 27 of the adjustment spindle 26a and the bottom portion of the housing 38, the first roller plug 34 and the second roller plug 40 are assembled. The two-roller plug 40 is opposed to one side of the substrate portions 61 and 61 where the cam surfaces 62 and 62 are formed. Further, the sliding blade portions 35 a and 35 b are arranged alternately and overlap each other in the width direction of the substrate portion 61.

  The cam surfaces 62, 62 are the outer circumferential surfaces of the cam grooves 32a, 32b of the cam shaft 32 on which the first and second rolling rollers 36, 42 roll, and the first and second roller plugs 34, 40. The inner surface is a rolling curved surface for applying axial thrust to the first and second rolling rollers 36 and 42 when the camshaft 32 rotates.

  The first and second roller plugs 34 and 40 are formed of a material having higher hardness than the aluminum alloy or the like constituting the housing 38, like an iron-based alloy such as bearing steel or high-speed steel. Therefore, the thrust from the first and second rolling rollers 36, 42 is received by the hard roller plugs 34, 40, and deformation and wear between the rolling rollers 36, 42 and the roller plugs 34, 40 are minimized. At the same time, the axial thrust can be reliably transmitted to the adjusting spindle 26a and the housing 38. Further, even when the size of the first and second rolling rollers 36 and 42 and the shape of the rolling curved surface of the rotation-linear motion converting portion are changed, only the first and second roller plugs 34 and 40 are replaced. Yes.

  The second roller plug 40 is formed with an engaging protrusion 40 a extending toward the housing 38, and engages with an engaging recess 38 a formed in the housing 38. Then, the first roller plug 34 and the second roller plug 40 are reliably positioned to stabilize the operation state of the parking mechanism. As described above, the first roller plug 34 has the same shape as the second roller plug 40. As shown in FIG. 4, the first roller plug 34 also has an engaging projection 34a, and the head of the adjusting spindle 26a. 27 is engaged with an engaging recess 27a formed in the 27. In this way, the first roller plug 34 and the second roller plug 40 have the same shape, so that the parts can be shared.

  The engaging position of the first roller plug 34 with respect to the adjusting spindle 26a (the engaging position of the engaging protrusion 34a and the engaging recess 27a) and the engaging position of the second roller plug 40 with respect to the housing 38 are (engaging protrusion). 40a is engaged with the engagement recess 38a), and is provided at a position eccentric with respect to the central axis XX of the adjusting spindle 26a. For this reason, the second roller plug 40 is provided with respect to the housing 38 with respect to the central axis XX. Rotation around is prevented. Since the engaging protrusions 34a and 40a can be simultaneously formed when the first roller plug 34 and the second roller plug 40 are formed by forging (forging), the manufacturing process is also simple.

  Next, the structure and assembly of the first and second roller plugs 34 and 40 will be described in detail with reference to FIGS. Since the first and second roller plugs 34 and 40 have the same shape, the structure will be described only for the first roller plug 34 shown in FIG. The first roller plug 34 includes a main body 34b and a pair of rectangular sliding wing portions 35a and 35b opposed to each other in the diametrical direction, and the above-described engagement protrusion 34a is formed on the main body 34b. The inner surfaces of the sliding wing portions 35 a and 35 b are finished to be flat surfaces, and the outer surface of one of the sliding wing portions 35 a is formed as a partial cylindrical surface capable of sliding contact with the cylindrical inner surface 38 b of the housing 38. On the other hand, the other sliding wing 35b is finished to be flat on both the inner and outer surfaces.

  As shown in FIG. 5, the first and second roller plugs 34 and 40 are assembled with the sliding blade portions 35a and 35b of the first roller plug 34 and the sliding blade portions 41a and 41b of the second roller plug 40. Are alternately fitted, and the camshaft 32 slides on the inner surface of the sliding blade portion 35b on the inner side of the first roller plug 34 and the inner surface of the sliding blade portion 41b on the inner side of the second roller plug 40. Abutting support is possible. The sliding blade portion 35b and the sliding blade portion 41a, and the sliding blade portion 35a and the sliding blade portion 41b are slidably fitted to each other in the central axis XX direction of the adjustment spindle 26a. They are in agreement. Accordingly, the camshaft 32 rotates around the central axis YY (see FIG. 3a) of the camshaft 32 orthogonal to the central axis XX of the adjustment spindle 26a, and in the direction of the central axis XX of the adjustment spindle 26a. Only allowed with movement. Therefore, the insertion port 38A {see FIGS. 2 and 3) of the housing 38 is a large hole through which the camshaft 32 can move in the direction of the central axis XX.

  As described above, the second roller plug 40 is prevented from rotating around the central axis XX with respect to the housing 38, and the first roller plug 34 is configured such that the sliding blade portions are opposed to the second roller plug 40. The first roller plug 34 cannot be rotated about the central axis XX because it is fitted so that it is in line contact with the outer peripheral surface of the camshaft 32 in the axial direction. In addition, the engagement position of the first roller plug 34 with respect to the adjustment spindle 26a is provided at a position that is eccentric with respect to the center axis XX of the adjustment spindle 26a. The rotation is prevented.

  Next, details of each component of the parking operation mechanism and an assembling procedure will be described with reference to FIGS. As shown in the exploded perspective view before assembly in FIG. 2, the adjustment spindle 26 a is engaged with the reversible screw portion 31 that is screwed with the adjustment sleeve 26 b (see FIG. 1), and the engagement protrusion 34 a of the first roller plug 34. And a head portion 27 having an engaging concave portion 27a. A seal groove 33 as shown in FIGS. 1 to 4 is formed in a ring shape in the intermediate shaft portion connecting the head portion 27 and the reversible screw portion 31, and a seal ring 44 (see FIG. 1-3) is inserted.

  A stop clip 46 is locked in a ring groove 38c (see FIGS. 1, 3 and 6) formed at the end of the housing 38 on the adjustment spindle 26a side. The stop clip 46 and the first roller plug 34 are connected to each other. As shown in FIGS. 1, 3, and 6, a spring 26 d is disposed via a flange 48 a of the holder 48. Therefore, when the spring 26d is set, the adjustment spindle 26a is always urged rightward (in FIG. 1) via the holder 48. In the holder 48, a through hole 48b is formed. In FIG. 2, when the holder 48 is assembled, the adjustment spindle 26a is fitted into the through hole 48b of the holder 48 from the right direction, and the head 27 of the adjustment spindle 26a, the first As shown in FIG. 7, the roller plug 34 is set so as to pass through a part of the roller plug 34 and to hold both ends of the first rolling roller 36 with its position regulated in the axial direction.

  As shown in FIGS. 6 and 7, the cylindrical outer peripheral surface of the holder 48 is partially formed in a pair of flat surfaces 48c parallel to each other in the diametrical direction. The both ends of the first rolling roller 36 arranged in the above are supported so as to be sandwiched up and down, and can be held at all times even if the first rolling roller 36 rolls. Further, a roller support ring 50 is provided on the distal end side (lower end side) of the camshaft 32. When the camshaft 32 is inserted from the insertion port 38A of the housing 38, as shown in FIGS. The first and second rolling rollers 36 and 42 partially accommodated in 32a and 32b are supported so as not to fall downward from the camshaft 32. Further, the cam support 32 is supported by the roller support ring 50 so that the first rolling roller 36 remains and the camshaft 32 does not come out upward (on the parking lever 30 side).

  As shown in FIG. 3A, a parking lever 30 for rotating the camshaft 32 about the axis Y-Y axis which is the axial center direction of the camshaft 32 is fitted to one end of the camshaft 32. Match. The parking lever 30 is restrained from moving in the Y-Y-axis direction by a nut 54 that is screwed into a base end 32c (upper end, see FIG. 2) of the camshaft 32 via a washer 53. As shown in FIGS. 2 and 3A, the dust boot 56 disposed between the camshaft 32 and the insertion port 38A is provided with a locking claw 58a of a boot holder 58 engaged with the insertion port 38A. To prevent dust and moisture from entering the rotation-linear motion converter from the outside.

  A torsion coil spring 60 is crowned on the outer peripheral surface of the nut 54, and one end thereof is engaged with the housing 38, and the other end 60 a (see FIG. 2) is engaged with the parking lever 30. The torsion coil spring 60 acts to always return the camshaft 32 to the initial position after the parking lever 30 is operated.

  As a procedure for assembling the parking operation mechanism, first, the second roller plug 40 is inserted into the cylindrical hole 38B formed in the housing 38, and the engaging protrusion 40a of the second roller plug 40 and the housing 38 are formed. Engage with the engaging recess 38a. Further, the first and second rolling rollers 36 and 42 partially accommodated in the cam grooves 32 a and 32 b of the cam shaft 32 are held by the roller support ring 50 with their positions regulated in the axial direction. The camshaft 32 is inserted from the insertion port 38A of the housing 38 with the dust boot 56, the boot holder 58, the parking lever 30, the washer 53, the nut 54, and the torsion coil spring 60 assembled at the upper end. The downward movement of the camshaft 32 is prevented by the boot holder 58 coming into contact with the housing 38 as shown in FIG. After the camshaft 32 is inserted, the torsion coil spring 60 is locked to the housing 38 and the parking lever 30.

  On the other hand, the engaging protrusion 34a of the first roller plug 34 is fitted into the engaging recess 27a formed in the head 27 of the adjusting spindle 26a, and the adjusting spindle 26a and the first roller plug 34 are combined. An assembly in which a seal ring 44 is fitted into a seal groove 33 formed in the intermediate shaft portion, and a holder 48 and a spring 26d are sequentially fitted from the reversible screw portion 31 side of the adjustment spindle 26a toward the first roller plug 34 side. Is inserted from the cylindrical hole 38 </ b> B of the housing 38.

  Finally, as shown in FIG. 3 (b), the retaining clip 46 is locked in the ring groove 38 c of the housing 38. As a result, the first roller plug 34 is pressed to the right through the holder 48 by the spring force of the spring 26d, and the camshaft 32 is moved through the first and second rolling rollers 36, 42 to the first. The first and second roller plugs 34 and 40 are sandwiched. As a result, the rotation / linear motion conversion portion is accommodated in the housing 38, the adjustment spindle 26a is movable in the direction of the axis XX, the camshaft 32 can be rotated about the axis YY, and the axis X -Supported so that it can move in the X direction.

  The holder 48 has a substantially hat-shaped cross section (substantially silk hat shape), and as shown in FIG. 6, a flange portion 48a that receives one end of the spring 26d, a flat portion 48c that sandwiches the first rolling roller 36, It is comprised by the latching | locking part 48d engaged with the head 27 of the adjustment spindle 26a. In the state where the holder 48 is set at the assembly position, the upper and lower flat portions 48c hold the both end surfaces 36a of the first rolling roller 36 in the axial direction so that the camshaft 32 is held. The movement in the direction of its own central axis YY is restrained by the holder 48 via the first rolling roller 36, and there is no possibility that the camshaft 32 will come out upward from the insertion hole 38A. In this manner, it is possible to prevent the camshaft 32 from falling off in a normal part assembling process without preparing a special part for preventing the camshaft 32 from falling off.

  Next, the operation of the rotation / linear motion conversion unit will be described. From the initial position where the first and second rolling rollers 36 and 42 are respectively sandwiched between the camshaft 32 and the first and second roller plugs 34 and 40, the camshaft 32 is moved by the parking lever 30 as shown in FIG. In this case, the first rolling roller 36 rotates to the required position while rotating between the cam groove 32a of the cam shaft 32 and the rolling curved surface of the first roller plug 34. Revolve. Similarly, the second rolling roller 42 revolves to a required position while rotating between the cam groove 32b of the cam shaft 32 and the rolling curved surface of the second roller plug 40.

  When the first and second rolling rollers 36 and 42 move to a required position corresponding to the amount of rotation of the camshaft 32, the first roller plug 34 moves to the left and gives an axial thrust to the adjustment spindle 26a. At the same time, the second roller plug 40 moves to the right and gives an axial thrust to the housing 38.

  When the parking brake is operated, by pulling a brake wire (not shown) connected to one end of the parking lever 30, the camshaft 32 rotates about the Y-Y axis, and the first rolling An axial thrust in the XX axis direction is applied to the adjustment spindle 26a via the roller 36 and the first roller plug 34, and at the same time, the XX is applied to the housing 38 via the second rolling roller 42 and the second roller plug 40. Axial thrust in the axial direction can be applied. The axial thrust applied to the adjusting spindle 26a is transmitted to one (inner side, right side in FIG. 1) brake pad 29 via the adjusting sleeve 26b and the piston 24. On the other hand, the axial thrust applied to the housing 38 moves the caliper 1 slidably supported by the fixed support 28 in the right direction in FIG. 1 (the outer side, FIG. 1). It is transmitted to the brake pad 29 on the left side, and a braking force can be applied to the rotor.

[Second Example of Embodiment]
FIGS. 9-10 has shown the 2nd example of embodiment of this invention corresponding to Claims 1-3,6,7. In the case of this example, the first roller plug 34A and the second roller plug 40A have different shapes. The first roller plug 34A includes one first substrate portion 63 and a pair of first sliding wing portions 64, 64. The first roller plug 34A has a first surface of the first embodiment described above on one side of the first substrate portion 63. A first cam surface 65 similar to the cam surface 62 of the example is formed. The pair of first sliding blade portions 64, 64 are arranged on one side in the axial direction from both ends in the width direction of the first substrate portion 63, similarly to the sliding blade portions 41 a, 41 b of the first example of the embodiment described above. It is bent at a right angle toward.

On the other hand, the second roller plug 40A includes one second substrate portion 66 and a pair of second sliding wing portions 67 and 67, and one side of the second substrate portion 66 has the first substrate portion 63 mounted on one side thereof. A second cam surface 68 for gradually changing the depth dimension is formed on the surface facing the one surface. When the direction in which the depth dimension of the second cam surface 68 changes is compared with the first cam surface 65, the direction of rotation of the camshaft 32 is the same direction, and the width direction of the substrate portions 63, 66 is the same. The reverse direction. The pair of second sliding wings 67 and 67 are bent at right angles in the direction approaching the first roller plug 34A from one end in the axial direction from both ends in the width direction of the second substrate 66. The distance D ₆₇ between the outer surfaces of the pair of second sliding blade portions ₆₇ , ₆₇ is equal to or less than the distance D ₆₄ between the inner surfaces of the pair of first sliding blade portions 64, ₆₄ (D ₃₇ ≦ D ₆₄ ).

  In the case of this example, the first roller plug 34A and the second roller plug 40A, each having the shape as described above, are formed with the cam surfaces 65 and 68 among the substrate portions 63 and 66, respectively. The first and second sliding blade portions 64 and 67 are overlapped with each other with respect to the width direction (vertical direction in FIG. 10) of the first and second substrate portions 63 and 66. Combined with state. Since the surfaces of the first and second sliding blade portions 64 and 67 that are in sliding contact with each other are planes parallel to the central axis of the adjustment spindle 26a, the second roller plug 40A, together with the adjustment spindle 26a, It can be displaced in the direction of the central axis of the adjusting spindle 26a.

  Further, in the case of this example, an engagement protrusion 40a formed on the other side surface of the first substrate 63 of the first roller plug 34A at a portion off the center of the first substrate 63, and the housing 38 The first roller plug 34A is positioned based on engagement with an engagement recess 38a formed in a portion where the first substrate 63 of the first roller plug 34A abuts on the inner surface. Further, the second roller plug 40A is positioned based on the engagement between the inner surfaces of the pair of first sliding blade portions 64, 64 and the pair of second sliding blade portions 67, 67, and parking. The operation state of the mechanism is stabilized.

  According to the structure of the disc brake operating device having the parking operation mechanism of the present example configured as described above, when the parking brake is operated, it is displaced in the axial direction of the adjusting spindle 26a (the left-right direction in FIG. 9). None of the pair of second sliding wing portions 67 and 67 constituting the second roller plug 40 </ b> A is in sliding contact with the inner surface of the housing 38. For this reason, even when the housing 38 is made of a light but relatively soft metal material such as an aluminum alloy and the second roller plug 40A is made of a hard iron-based alloy, the inner surface of the housing 38 is worn. Can be prevented.

  In the case of this example, the arrangement direction of the camshaft 32 is different in the direction perpendicular to the first example of the embodiment described above. However, the arrangement direction of the camshaft 32 is selected by design in any structure. Since the configuration and operation of the other parts are the same as those in the first example of the above-described embodiment, redundant description is omitted.

  Although two examples of the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the two examples of these embodiments. For example, in each example of the embodiments, a floating caliper type is used. (Floating caliper type) Although the example applied to the disc brake has been described, the present invention can also be applied to a fixed caliper type (opposite piston type) disc brake.

It is sectional drawing of the principal part of the disc brake actuator provided with the operation mechanism for parking of the 1st example of embodiment of this invention. It is a disassembled perspective view of the operating mechanism for parking similarly. (A) is assembly sectional drawing of a rotation-linear motion conversion part similarly, (b) is AA sectional drawing of Fig.3 (a). It is a perspective view of an adjustment spindle and a 1st roller plug. It is an assembly perspective view of the 1st roller plug and the 2nd roller plug. It is a partial notch perspective view of the rotation-linear motion conversion part which shows the detail of a holder. It is a perspective view which shows the holding state of the 1st rolling roller by a holder. It is a perspective view which shows the holding state of both rolling rollers by the ring provided in the cam shaft. It is sectional drawing similar to FIG. 1 which shows the 2nd example of embodiment of this invention. It is BB sectional drawing of FIG. It is a fragmentary sectional view of the operating mechanism for parking in the conventional disc brake actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cam shaft 1a Cam groove 2 Thrust rod 3 Adjustment panel 3a Concave groove 4 Cam shaft hole 5 Parking lever 6 Return spring 7 Caliper 8 Stop pin 9 Pressing spring 20 Caliper 22 Piston assembly 24 Piston 26 Adjuster mechanism 26a Adjustment spindle 26b Adjustment sleeve 26b 26c Bearing 26d Spring 27 Adjustment spindle head 27a Engaging recess 28 Support 29 Brake pad 30 Parking lever 31 Reversible screw 32 Camshaft 32a, 32b Cam groove 32c Base end of camshaft 33 Sealing groove 34, 34A First roller plug 34a engaging protrusion 34b main body 35a, 35b sliding blade part 36 first rolling roller 36a end face 38 housing (caliper housing)
38A Insertion port 38B Cylindrical hole
38a engagement recess 38b cylindrical inner surface 38c ring groove 40, 40A second roller plug 40a engagement projection 41a, 41b sliding blade 42 second rolling roller 44 seal ring 46 retaining clip 48 holder 48a collar 48b through hole 48c Flat surface 48d Locking portion 50 Roller support ring 53 Washer 54 Nut 56 Dust boot 58 Boot holder 58a Locking claw 60 Torsion coil spring 60a Torsion coil spring other end 61, 61a Substrate portion 62 Cam surface 63 First substrate portion 64 First Sliding blade portion 65 First cam surface 66 Second substrate portion 67 Second sliding blade portion 68 Second cam surface (PM) Parking operation mechanism (SM) Service brake mechanism

Claims (7)

  In a disc brake actuator having a parking operation mechanism on one end side of a caliper that slidably supports a piston incorporating an adjuster mechanism, the operation mechanism includes an adjustment spindle of the adjuster mechanism, the adjustment spindle, A camshaft which is orthogonal and has a parking lever at one end, and a rotation-linear motion conversion portion which is disposed between the camshaft and the adjustment spindle and which gives axial thrust to the adjustment spindle by rotation of the camshaft, The rotation / linear motion conversion portion is held in a cam groove of the cam shaft that rotates between the first roller plug and the first roller plug that abuts and engages with the adjusting spindle and rotates between the cam shaft and the first roller plug. A first roller, a second roller plug in contact with the caliper housing, a camshaft and the second roller while rotating; The adjustment spindle is constituted by a second rolling roller held in the cam groove of the camshaft that rolls between the plug and the spring force of the spring acting on the holder engaged with the adjustment spindle. For parking, the first roller plug is pressed toward the camshaft side via the first rolling roller, and the holder restricts the positions of both ends of the first rolling roller in the axial direction on the inner surface of the end. Disc brake actuator with operating mechanism.   2. The holder according to claim 1, wherein the holder has a substantially hat-shaped cross section, and a hook portion that holds one end of the spring is formed on one side, and a locking portion that engages with the adjustment spindle is formed on the other side. Disc brake actuating device equipped with a parking operation mechanism.   The first and second rolling rollers are partially housed in cam grooves formed in the cam shaft in a state in which the first and second rolling rollers are arranged in the vertical direction. The disc brake operating device provided with the parking operation mechanism according to any one of claims 1 to 2, wherein the position is regulated in the axial direction by a roller support ring provided on the disc.   The first roller plug includes one substrate portion and a pair of sliding blade portions, and the first rolling roller is brought into rolling contact with one surface of the substrate portion with respect to the axial direction of the adjustment spindle. Forming a cam surface that gradually changes the depth in the axial direction in the width direction of the substrate portion, and the pair of sliding blade portions are directed from one end in the width direction of the substrate portion toward one axial direction. The second roller plug is a member that has the same shape as the first roller plug in a state where the axial direction and the width direction are reversed with respect to the first roller plug. The first roller plug and the second roller plug are opposed to each other on one side of the respective substrate portions on which the cam surface is formed, and the sliding blade portions are mutually connected with respect to the width direction of the substrate portion. In a superimposed state Are combined saw, disc brake actuator having a parking operation mechanism according to any one of claims 1 to 3.   An engaging protrusion formed on the other side of the substrate portion of the first and second roller plugs at a portion deviating from the center of the substrate portion, and a substrate portion of the first roller plug is protruded by the inner surface of the caliper housing. The parking operation mechanism according to claim 4, wherein the first and second roller plugs are positioned based on engagement with a contact portion and an engagement recess formed on a head of the adjustment spindle. Disc brake actuator equipped with.   The first roller plug includes a first substrate portion and a pair of first sliding blade portions, and the first roller plug is disposed on one side of the first substrate portion with respect to the axial direction of the adjustment spindle. A first cam surface is formed, which causes the rolling roller to come into rolling contact with the first cam surface to gradually change the depth in the axial direction with respect to the width direction of the first substrate portion. One substrate portion is bent at a right angle from both ends in the width direction toward one side in the axial direction, and the second roller plug includes one second substrate portion and a pair of second sliding blade portions. Then, with respect to the axial direction of the adjusting spindle, the second rolling roller is brought into rolling contact with one surface of the second substrate portion facing the one surface of the first substrate portion, and the depth in the axial direction is With respect to the width direction of the second substrate portion, gradually in the direction opposite to the first cam surface. A second cam surface to be changed is formed, and the pair of second sliding wing portions are perpendicular to a direction approaching the first roller plug from one end in the width direction to both ends in the width direction of the second substrate portion. The distance between the outer surfaces of the pair of second sliding wings is less than or equal to the distance between the inner surfaces of the pair of first sliding wings, and the first roller plug and the The second roller plug is made to oppose one side of each substrate part on which the cam surface is formed, and the first and second sliding blade parts are arranged on the first and second substrate parts. The disc brake operating device provided with the operating mechanism for parking according to any one of claims 1 to 3, which are combined in a state where they are overlapped with each other in the width direction.   An engaging protrusion formed on the other side surface of the first substrate portion of the first roller plug at a portion off the center of the first substrate portion, and a first substrate portion of the first roller plug on the inner surface of the caliper housing. The first roller plug is positioned on the basis of engagement with an engagement recess formed in a portion that abuts against the inner surface of the pair of first sliding blade portions and the pair of second sliding blades. The disc brake actuating device provided with the parking operation mechanism according to claim 6, wherein the second roller plug is positioned based on engagement with a portion.

Images