JP2017180789A - Cable guide and vehicular brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cable guide and a vehicular brake capable of, for example, easily suppressing abrasion of a cable guide or cable.SOLUTION: A cable guide includes: a first cover part, for example, formed on a closed cross section, extending along a cable in a state of covering the cable, configured to guide the cable in a slidable manner, and forming a first lubricant storage part capable of storing lubricant between itself and the cable; and a second cover part formed in the closed cross section, extending along the cable in the state of covering the cable, forming a second lubricant storage part connecting to the first lubricant storage part and capable of storing lubricant between itself and the cable, and expanding/contracting with relative movement of the cable to the first cover part.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a cable guide and a vehicle brake.

  2. Description of the Related Art Conventionally, there is known a vehicle brake that has a motion conversion mechanism that converts the rotation of a motor into a linear motion of a cable and obtains a braking state by rotating the motor, pulling the cable, and moving a brake shoe (for example, a patent References 1, 2).

JP2015-172385A US 2013/0087418 Specification

  In such a vehicle brake, for example, the cable guide and the cable may be worn by sliding with the cable guide that guides the cable. Then, one of the subjects of this invention is obtaining the cable guide and brake for vehicles which are easy to suppress abrasion of a cable guide or a cable, for example.

  The cable guide of the present invention is, for example, a cable guide that accommodates and guides a cable that is interposed between a braking member and a driving mechanism and pulls the braking member so as to brake the wheel by the power of the driving mechanism. A first lubricant that is configured in a closed cross section, extends along the cable in a state of covering the cable, slidably guides the cable, and can accommodate a lubricant between the cables A first cover portion constituting the housing portion, and a closed cross section, extending along the cable in a state of covering the cable, and connected to the first lubricant housing portion and the lubricant between the cables The second lubricant container is configured to accommodate the first cover and fixed to the first cover without leakage of the lubricant from the first lubricant container and the second lubricant container. A first fixing portion that is separated from the first cover portion and a second fixing portion that is fixed to the cable in a state where there is no leakage of lubricant from the second lubricant accommodating portion. And a second cover portion that expands and contracts as the cable moves relative to the first cover portion. Therefore, for example, wear of a cable guide or a cable is easily suppressed by the lubricant in the cable guide. In addition, since the generation of rust and wear powder in the cable guide and the entry of rust and wear powder from the outside into the cable guide are suppressed, it is easy to stabilize the drive efficiency and improve the durability of the drive mechanism. .

  In the cable guide, for example, the first cover portion has two curved portions between both ends in the extending direction of the first cover portion. Therefore, for example, the force applied to the sliding portion of the first cover portion with the cable is more easily dispersed than when the first cover portion is provided with one curved portion. The durability of the cable is easy to improve. Further, the first cover part can be easily manufactured as compared with the case where three or more curved parts are provided in the first cover part.

  The vehicle brake according to the present invention includes the cable guide, the braking member, the drive mechanism, the cable, the support member, and a drive mechanism fixing portion that fixes the drive mechanism to the support member; A cable guide fixing portion that is different from the driving mechanism fixing portion, in which the cable guide is fixed to the support member. Therefore, for example, when removing the drive mechanism, it is not necessary to remove the cable guide from the support member, so that leakage of the lubricant is suppressed.

  In the vehicle brake of the present invention, the cable guide, the braking member, the drive mechanism, the cable, the support member, and the support member are fixed to the cable guide and the drive mechanism. And a fixing part. Therefore, for example, since the common fixing portion is shared by the cable guide and the drive mechanism, the configuration of the vehicle brake is easily simplified.

FIG. 1 is an exemplary and schematic rear view of the vehicle brake according to the first embodiment from the rear of the vehicle. FIG. 2 is an exemplary and schematic side view of the vehicular brake according to the first embodiment from the outside in the vehicle width direction. FIG. 3 is an exemplary and schematic side view of the operation of the braking member of the first embodiment, and is a diagram in a non-braking state. FIG. 4 is an exemplary schematic side view of the operation of the braking member of the first embodiment, and is a diagram in a braking state. FIG. 5 is an exemplary schematic cross-sectional view of the drive mechanism of the first embodiment, and is a view in a non-braking state. FIG. 6 is an exemplary schematic cross-sectional view of the drive mechanism according to the first embodiment, and is a diagram in a braking state. 7 is a sectional view taken along line VII-VII in FIG. FIG. 8 is an exemplary schematic view of the drive mechanism and the cable guide according to the first embodiment. FIG. 9 is an exemplary schematic view of the cable guide and the cable according to the first embodiment. FIG. 10 is an exemplary schematic cross-sectional view of a part of the cable guide according to the first embodiment. FIG. 11 is an exemplary schematic view of a first cover portion of the cable guide according to the first embodiment. FIG. 12 is an exemplary schematic view of a first cover portion of the cable guide according to the first embodiment. FIG. 13 is an exemplary schematic cross-sectional view of a second cover portion of the cable guide according to the first embodiment. FIG. 14 is an exemplary schematic view of the support member and the first cover portion of the first embodiment. FIG. 15 is an exemplary schematic view of a part of the vehicle brake according to the first embodiment and including a fixing part between the support member and the first cover part. FIG. 16 is a diagram showing a part of a cross section taken along line XVI-XVI of FIG. FIG. 17 is an exemplary schematic view of the cable guide and the cable according to the second embodiment. FIG. 18 is an exemplary schematic cross-sectional view of the drive mechanism of the second embodiment. FIG. 19 is an exemplary schematic view of the fixing portion of the cable guide according to the third embodiment. FIG. 20 is an exemplary schematic view of the first cover portion of the cable guide according to the fourth embodiment. FIG. 21 is an exemplary schematic view of a vehicle brake support member and a cable guide according to the fifth embodiment. FIG. 22 is an exemplary schematic view of the cable guide according to the fifth embodiment. FIG. 23 is an exemplary schematic view of the first cover portion of the cable guide according to the fifth embodiment. FIG. 24 is an exemplary schematic view of a metal member of the cable guide according to the fifth embodiment. FIG. 25 is an exemplary schematic view of a part of the first cover portion of the cable guide according to the sixth embodiment. FIG. 26 is an exemplary schematic view of a part of the first cover portion of the cable guide according to the seventh embodiment.

  Hereinafter, exemplary embodiments of the present invention are disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. According to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration.

  It should be noted that the following exemplary embodiments include components having similar functions. Constituent elements having similar functions are denoted by common reference numerals and redundant description may be omitted. 1 to 4, for the sake of convenience, the front in the vehicle front-rear direction is indicated by an arrow X, the outer side in the vehicle width direction (axle direction) is indicated by an arrow Y, and the upper side in the vehicle vertical direction is indicated by an arrow Z. .

  In the following, a case where the brake device 2 which is an example of a vehicle brake is applied to the left rear wheel (non-drive wheel) will be exemplified, but the present invention can be similarly applied to other wheels. It is.

(First embodiment)
<Brake device configuration>
As shown in FIG. 1, the brake device 2 is accommodated inside the peripheral wall 1 a of the cylindrical wheel 1. The brake device 2 is configured as a drum brake. That is, as shown in FIG. 2, the brake device 2 includes arc-shaped brake shoes 3 on both the front and rear sides. A cylindrical drum 4 (see FIGS. 3 and 4) is provided around the brake device 2. The drum 4 rotates integrally with the wheel 1 around the rotation center C along the vehicle width direction (Y direction). The brake device 2 moves the two brake shoes 3 so as to contact the inner peripheral surface 4 a of the cylindrical drum 4. Thereby, the drum 4 and the wheel 1 are braked by the friction between the brake shoe 3 and the drum 4. The brake shoe 3 is an example of a braking member.

  The brake device 2 includes a wheel cylinder 51 (see FIG. 2) that operates by hydraulic pressure and a motor 120 (see FIG. 5) that operates by energization as actuators that move the brake shoe 3. Each of the wheel cylinder 51 and the motor 120 can move the two brake shoes 3. The wheel cylinder 51 is used for braking during traveling, for example, and the motor 120 is used for braking during parking, for example. That is, the brake device 2 is an example of an electric parking brake. The motor 120 may also be used for braking during traveling.

  As shown in FIGS. 1 and 2, the brake device 2 includes a disk-shaped back plate 6. The back plate 6 is provided in a posture intersecting with the vehicle width direction. That is, the back plate 6 extends substantially along a direction intersecting the vehicle width direction, specifically, substantially along a direction (XZ plane) orthogonal to the vehicle width direction. As shown in FIG. 1, the components of the brake device 2 are provided on both the outer side and the inner side of the back plate 6 in the vehicle width direction. The back plate 6 supports each component of the brake device 2 directly or indirectly. That is, the back plate 6 is an example of a support member. The back plate 6 is connected to a connection member (not shown) with the vehicle body. The connection member is, for example, a part of the suspension (for example, an arm, a link, an attachment member, etc.). The opening 6b provided in the back plate 6 shown in FIG. 2 is used for coupling with the connection member. The brake device 2 can also be used for drive wheels. When the brake device 2 is used for driving wheels, an axle shaft (not shown) passes through an opening 6c provided in the back plate 6 shown in FIG. The back plate 6 is made of, for example, a metal material.

  The wheel cylinder 51 and the brake shoe 3 shown in FIG. 2 are arranged on the outer side of the back plate 6 in the vehicle width direction. The brake shoe 3 is movably supported on the back plate 6. In the present embodiment, as shown in FIG. 3, for example, the lower end 3a of the brake shoe 3 is supported by the back plate 6 so as to be rotatable around the rotation center C1. The rotation center C1 is substantially parallel to the rotation center C of the wheel 1. The wheel cylinder 51 is supported on the upper end portion of the back plate 6. The wheel cylinder 51 has two movable parts (pistons) (not shown) that can project in the vehicle front-rear direction (left-right direction in FIG. 2). The wheel cylinder 51 causes the two movable parts to protrude in response to the pressurization. The two projecting movable parts push the upper end 3b of the brake shoe 3, respectively. Due to the protrusion of the two movable parts, the two brake shoes 3 rotate around the rotation center C1 and move so that the upper end parts 3b are separated from each other in the vehicle front-rear direction. As a result, the two brake shoes 3 move outward in the radial direction of the rotation center C of the wheel 1. A belt-like lining 31 along the cylindrical surface is provided on the outer periphery of each brake shoe 3. Therefore, the lining 31 and the inner peripheral surface 4a (see FIG. 4) of the drum 4 come into contact with each other by the movement of the two brake shoes 3 to the radially outer side of the rotation center C. Due to the friction between the lining 31 and the inner peripheral surface 4a, the drum 4 and thus the wheel 1 are braked. As shown in FIG. 2, the brake device 2 includes a return member 32. When the operation of pushing the brake shoe 3 by the wheel cylinder 51 is released, the return member 32 moves from the position where the two brake shoes 3 come into contact with the inner peripheral surface 4a of the drum 4 (braking position Pb, see FIG. 4). The drum 4 is moved to a position (non-braking position Pn, initial position, see FIG. 3) that does not contact the inner peripheral surface 4a of the drum 4. The return member 32 is an elastic member such as a coil spring, for example, and gives each brake shoe 3 a force in a direction approaching the other brake shoe 3, that is, a force in a direction away from the inner peripheral surface 4 a of the drum 4. .

<Configuration and operation of moving mechanism>
Further, the brake device 2 includes a moving mechanism 8 (see FIGS. 3 and 4) that moves the two brake shoes 3 from the non-braking position Pn to the braking position Pb. The moving mechanism 8 is provided outside the back plate 6 in the vehicle width direction. As shown in FIGS. 2 to 4, the moving mechanism 8 includes a lever 81 (not shown in FIG. 2), a cable 82, and a strut 83. The lever 81 is one of the two, for example, between the brake shoe 3L on the left side of FIG. 2 and the back plate 6, so as to overlap the brake shoe 3L and the back plate 6 in the axial direction of the center of rotation C of the wheel 1. Is provided. The lever 81 is supported by the brake shoe 3L so as to be rotatable around the rotation center C2. The rotation center C2 is located on the side of the brake shoe 3L away from the rotation center C1, that is, on the upper end in FIG. 3, and is substantially parallel to the rotation center C and the rotation center C1. The cable 82 is engaged with a lower end portion 81 a on the side farther from the rotation center C <b> 2 of the lever 81 via an engagement member 84. The cable 82 moves the lower end portion 81a of the lever 81 in a direction approaching the brake shoe 3R on the right side of FIG. The cable 82 moves substantially along the back plate 6. The strut 83 is interposed between the lever 81 and the brake shoe 3R different from the brake shoe 3L on which the lever 81 is supported, and stretches between the lever 81 and the other brake shoe 3R. The connection position P1 between the lever 81 and the strut 83 is set between the rotation center C2 and the connection position P2 between the cable 82 and the lever 81.

  In such a moving mechanism 8, when the cable 82 is pulled and moved to the right side in FIGS. 3 and 4, the lever 81 moves in a direction approaching the brake shoe 3 </ b> R as shown in FIG. 4 (arrow a). The lever 81 pushes the brake shoe 3R through the strut 83 (arrow b). As a result, the brake shoe 3R rotates around the rotation center C1 from the non-braking position Pn (FIG. 3) (arrow c) and moves to a position in contact with the inner peripheral surface 4a of the drum 4 (braking position Pb, FIG. 4). . In this state, the connection position P2 between the cable 82 and the lever 81 corresponds to the power point, the rotation center C2 corresponds to the fulcrum, and the connection position P1 between the lever 81 and the strut 83 corresponds to the action point. Further, when the brake shoe 3R is in contact with the inner peripheral surface 4a and the lever 81 moves to the right side in FIGS. 3 and 4, that is, the strut 83 pushes the brake shoe 3R (arrow a), the strut 83 is stretched. Accordingly, the brake shoe 3L rotates counterclockwise in FIGS. 3 and 4 (arrow d) with the connection position P1 with the strut 83 as a fulcrum. As a result, the brake shoe 3L rotates around the rotation center C1 from the non-braking position Pn (FIG. 3) and moves to a position (braking position Pb, FIG. 4) in contact with the inner peripheral surface 4a of the drum 4. In this manner, the brake shoes 3L and 3R are moved from the non-braking position Pn to the braking position Pb by the operation of the moving mechanism 8. In the state after the brake shoe 3R contacts the inner peripheral surface 4a of the drum 4, the connection position P1 between the lever 81 and the strut 83 serves as a fulcrum. The amount of movement of the brake shoes 3L, 3R is very small, for example, 1 mm or less.

  The cable 82 is interposed between the brake shoe 3 and the drive mechanism 100 and pulls the brake shoe 3 so as to brake the wheel 1 by the power of the drive mechanism 100.

<Drive mechanism>
The driving mechanism 100 shown in FIGS. 1, 2, 5 and 6 moves the two brake shoes 3 from the non-braking position Pn to the braking position Pb via the moving mechanism 8 (see FIGS. 3 and 4). As shown in FIGS. 1 and 2, the drive mechanism 100 is located on the inner side in the vehicle width direction of the back plate 6 and is fixed to the back plate 6. The cable 82 shown in FIGS. 2 to 5 passes through an opening 6 d (see FIG. 5) provided in the back plate 6.

  As shown in FIG. 5, the drive mechanism 100 includes a housing 110, a motor 120, a speed reduction mechanism 130, and a motion conversion mechanism 140.

  The housing 110 supports the motor 120, the speed reduction mechanism 130, and the motion conversion mechanism 140. The housing 110 can be configured to include a plurality of members. In this case, the plurality of members can be combined and integrated by a coupling tool (not shown) such as a screw. The housing 110 is fixed to the back plate 6 by a fixing tool 115 such as a screw (bolt). A housing chamber R surrounded by a wall 111 is provided in the housing 110. The motor 120, the speed reduction mechanism 130, and the motion conversion mechanism 140 are accommodated in the accommodation chamber R and covered with the wall portion 111. The housing 110 may be referred to as a base, a support member, a casing, or the like. In addition, the structure of the housing 110 is not limited to what was illustrated here. The fixture 115 is also referred to as a coupler. The fixing tool 115 is an example of a driving mechanism fixing portion.

  The motor 120 is an example of an actuator, and includes a case 121 and a housing component housed in the case 121. The housing components include, for example, a stator, a rotor, a coil, and a magnet (not shown) in addition to the shaft 122. The shaft 122 protrudes from the case 121 in a direction D1 along the first rotation center Ax1 of the motor 120. The direction D1 is rightward in FIG. The motor 120 is driven by driving power based on the control signal, and rotates the shaft 122. The shaft 122 can also be referred to as an output shaft.

  Deceleration mechanism 130 includes a plurality of gears rotatably supported by housing 110. The plurality of gears are, for example, a first gear 131, a second gear 132, and a third gear 133. Deceleration mechanism 130 can be referred to as a rotation transmission mechanism.

  The first gear 131 rotates integrally with the shaft 122 of the motor 120. The first gear 131 can be referred to as a drive gear.

  The second gear 132 rotates around the second rotation center Ax2 parallel to the first rotation center Ax1. The second gear 132 includes an input gear 132a and an output gear 132b. The input gear 132a meshes with the first gear 131. The number of teeth of the input gear 132a is larger than the number of teeth of the first gear 131. Therefore, the second gear 132 is decelerated to a lower rotational speed than the first gear 131. The output gear 132b is located in the direction opposite to the direction D1 with respect to the input gear 132a. The second gear 132 can be referred to as an idler gear.

  The third gear 133 rotates around a third rotation center Ax3 that is parallel to the first rotation center Ax1. The third gear 133 meshes with the output gear 132b of the second gear 132. The number of teeth of the third gear 133 is larger than the number of teeth of the output gear 132b. Therefore, the third gear 133 is decelerated to a lower rotational speed than the second gear 132. The third gear 133 can be referred to as a driven gear. Note that the configuration of the speed reduction mechanism 130 is not limited to that illustrated here. The speed reduction mechanism 130 may be a rotation transmission mechanism other than a gear mechanism, such as a rotation transmission mechanism using a belt, a pulley, or the like.

  The motion conversion mechanism 140 includes a rotating member 141 and a linear motion member 142.

  The rotating member 141 rotates around the third rotation center Ax3. The rotating member 141 has a small diameter portion 141a and a large diameter portion 141b having a larger outer diameter than the small diameter portion 141a. The small diameter part 141a is a part located in the direction opposite to the direction D1 in the rotating member 141, and is configured in a cylindrical shape. The large diameter portion 141b is a portion of the rotating member 141 that is located in the direction D1. The large diameter portion 141b has a bottom wall portion 141b1 and a side wall portion 141b2. The bottom wall portion 141b1 projects in the radial direction from the end portion in the direction D1 of the small diameter portion 141a, and is configured in an annular shape and a plate shape. The side wall 141b2 extends in the direction D1 from the peripheral edge of the bottom wall 141b1, and is configured in a cylindrical shape. The side wall part 141b2 may be referred to as a peripheral wall part or a cylindrical wall part. The large-diameter portion 141b is provided with a concave portion 141b3 that is opened in the direction D1.

  The teeth of the third gear 133 are provided on the side wall portion 141b2 of the large diameter portion 141b. That is, the rotating member 141 is also the third gear 133. The part where the teeth of the third gear 133 are provided is an example of a driven part. The cylindrical portion 112 of the housing 110 is accommodated in the recess 141b3. In the recess 141b3, the thrust bearing 143 is located between the end 112a of the cylindrical part 112 in the direction opposite to the direction D1 and the bottom wall part 141b1. The thrust bearing 143 receives a load in the axial direction of the third rotation center Ax3. The thrust bearing 143 is a thrust roller bearing in the example of FIG. 5, but is not limited to this. The large-diameter portion 141b and the rotating member 141 are rotatably supported by the housing 110 via a thrust bearing 143.

  The small diameter portion 141 a is inserted into a radial bearing 144 housed in the first hole 113 a of the housing 110. The cross section of the first hole 113a is substantially circular. The first hole 113a extends along the axial direction of the third rotation center Ax3. The small-diameter portion 141a and thus the rotating member 141 are rotatably supported by the housing 110 via a radial bearing 144. Although the radial bearing 144 is a metal bush in the example of FIG. 5, it is not limited to this.

  The rotating member 141 is provided with a through hole 141c having a circular cross section that penetrates the small diameter portion 141a and the bottom wall portion 141b1. A female screw part 145a is provided in the through hole 141c.

  The linear motion member 142 extends along the third rotational center Ax3 and penetrates the rotational member 141. The linear motion member 142 includes a rod-like portion 142a and a connecting portion 142b.

  The rod-like portion 142 a is inserted into the through hole 141 c of the rotating member 141, the concave portion 141 b 3 of the large-diameter portion 141 b of the rotating member 141, and the second hole 113 b provided in the cylindrical portion 112 of the housing 110. The cross section of the second hole 113b is substantially circular. The second hole 113b is positioned in the direction D1 of the first hole 113a and extends along the axial direction of the third rotation center Ax3. The rod-like portion 142a has a substantially circular cross section. The rod-like portion 142 a is provided with a male screw portion 145 b that meshes with the female screw portion 145 a of the rotating member 141.

  The connecting portion 142 b is connected to the end portion 82 a of the cable 82 by the connecting member 146. As shown in FIG. 7, the connecting member 146 passes through the end portion 82 a and the connecting portion 142 b of the cable 82. The connecting member 146 is, for example, a pin.

  As shown in FIG. 7, a groove 113 c is provided on the inner surface of the second hole 113 b provided in the cylindrical portion 112 of the housing 110. The groove 113c extends with a substantially constant width and depth along the third rotation center Ax3. The groove 113c is provided at two locations across the third rotation center Ax3. The end of the connecting member 146 in the longitudinal direction is inserted into the groove 113c. The circumferential width of the third rotation center Ax3 of the groove 113c is set to be slightly larger than the width of the end portion of the connecting member 146 in the longitudinal direction. Therefore, the connection member 146 and the circumferential surface of the groove 113c are in contact with each other, so that the rotation of the connection member 146 and thus the linear motion member 142 around the third rotation center Ax3 is limited. Further, as shown in FIG. 6, the connecting member 146 is movable in the recess 141b3. That is, the connecting member 146 is positioned in the recess 141b3 in a state where the linear motion member 142 is positioned at the braking position Pb. Further, the surface 113d in the direction D1 of the groove 113c shown in FIG. 7 restricts the connection member 146 from moving in the direction D1. The surface 113d can be referred to as a stopper or a position limiter. In addition, the structure which couple | bonds the linear motion member 142 and the cable 82 is not limited to the example of FIG.

  In such a configuration, the rotation of the shaft 122 of the motor 120 is transmitted to the rotating member 141 via the speed reduction mechanism 130, and when the rotating member 141 rotates, the female screw portion 145 a of the rotating member 141 and the male screw portion of the linear motion member 142. Due to the meshing with 145b and the restriction of the rotation of the linear motion member 142 by the housing 110 in the groove 113c, the linear motion member 142 and the non-braking position Pn (FIG. 5) and the braking along the axial direction of the third rotational center Ax3 It moves between the position Pb (FIG. 6).

  The portion of the cylindrical portion 112 of the housing 110 where the groove 113c is provided is an example of a rotation limiting portion that limits the rotation of the connecting member 146 and thus the linear motion member 142 around the third rotation center Ax3. As a result, the linear motion member 142 is also an example of a guide portion that guides the linear motion member 142 along the axial direction of the third rotation center Ax3.

<Cable guide>
As shown in FIGS. 2 and 8, the brake device 2 includes a cable guide 85 that accommodates and guides the cable 82.

  As shown in FIG. 9, the cable guide 85 includes a first cover portion 86 and a second cover portion 87 fixed to the first cover portion 86. As shown in FIG. 10, the cable 82 is inserted into the first cover portion 86 and the second cover portion 87. The first cover portion 86 is also referred to as a base member or a non-stretchable member, and the second cover portion 87 is also referred to as a stretchable member or a bellows.

  As shown in FIG. 9, the first cover portion 86 extends along the cable 82 while covering the cable 82. Specifically, as shown in FIGS. 11 and 12, the first cover portion 86 is configured in a cylindrical shape. That is, the first cover portion 86 is configured with a closed cross section. The 1st cover part 86 is comprised by the metal pipes, for example. The 1st cover part 86 guides the cable 82 so that sliding is possible. The first cover part 86 is supported by the back plate 6. The first cover portion 86 is made of a metal material.

  As shown in FIGS. 11 and 12, the first cover portion 86 has a proximal end portion 86a and a distal end portion 86b opposite to the proximal end portion 86a. The base end portion 86a is inserted into the opening 6d of the back plate 6 and fixed to the back plate 6 (see FIG. 5). The first cover portion 86 includes three linear portions 86d1, 86d2, 86d3 and two curved portions 86e1, 86e2 between the base end portion 86a and the distal end portion 86b. A curved portion 86e1 is provided between the linear portion 86d1 and the linear portion 86d2, and a curved portion 86e2 is provided between the linear portion 86d2 and the linear portion 86d3.

  As shown in FIG. 10, the first cover portion 86 is provided with a through-hole 86 c extending over the base end portion 86 a and the tip end portion 86 b. The cable 82 is inserted into the through-hole 86c, and the cable 82 moves relative to the first cover portion 86. The first cover portion 86 constitutes a first lubricant accommodating portion 86 i that accommodates the lubricant 88 between the first cover portion 86 and the cable 82. The lubricant 88 is, for example, grease. The first lubricant accommodating portion 86i is included in the through hole 86c. The first cover portion 86 includes a large-diameter portion 86h1 provided at the tip portion 86b and a small-diameter portion 86h2 having an outer diameter smaller than that of the large-diameter portion 86h1. The inner diameter of the first cover portion 86 is large enough to allow the engagement member 84 provided on the cable 82 to pass through. The proximal end portion 86a is also referred to as one end portion (end portion), and the distal end portion 86b is also referred to as the other end portion (end portion).

  As shown in FIG. 9, the second cover portion 87 extends along the cable 82 while covering the cable 82. Specifically, as shown in FIG. 13, the second cover portion 87 is configured in a cylindrical shape. That is, the 2nd cover part 87 is comprised by the closed cross section. The second cover portion 87 includes a base end portion 87a, a tip end portion 87b opposite to the base end portion 87a, and a bellows-like stretchable portion 87c extending over the base end portion 87a and the tip end portion 87b. ing. Further, the second cover portion 87 is provided with a through hole 87d extending over the base end portion 87a and the tip end portion 87b via the extendable portion 87c. As shown in FIG. 10, a cable 82 is inserted into the through hole 87d. Further, the second cover portion 87 constitutes a second lubricant accommodating portion 87 e that accommodates the lubricant 88 between the second cover portion 87 and the cable 82. The second lubricant accommodating portion 87e is connected to the first lubricant accommodating portion 86i. The second lubricant accommodating portion 87e is included in the through hole 87d. The second cover portion 87 is made of, for example, an elastomer. The proximal end portion 87a is also referred to as one end portion (end portion), and the distal end portion 87b is also referred to as the other end portion (end portion).

  As shown in FIG. 10, the base end portion 87a leaks the lubricant 88 (from the base end portion 87a and the front end portion 86b) from the first lubricant containing portion 86i and the second lubricant containing portion 87e. In a state where there is no leakage (a state in which leakage is restricted), the front end portion 86b of the first cover portion 86 is fixed. Specifically, the inner periphery of the base end portion 87a accommodates the large diameter portion 86h1 of the first cover portion 86 and a large diameter portion 87f1 engaged with the large diameter portion 86h1, and a part of the small diameter portion 86h2. The small diameter part 87f2 accommodated is provided. The large-diameter portion 87f1 and the small-diameter portion 87f2 are in close contact with the large-diameter portion 86h1 and the small-diameter portion 86h2 (linear portion 86d3), and the base end portion 87a and the distal end portion 86b are sealed. In addition, annular recesses 86k and 86l are provided on the inner periphery and the outer periphery of the base end portion 87a, respectively. The base end portion 87a provided with the recesses 86k and 86l is thin, and the base end portion 87a is easily elastically deformed. Thereby, for example, even when the base end portion 87a is caught by another member and turned up, the load that causes the turn-up deformation is less likely to be transmitted to the distal end portion 87b side than the concave portions 86k and 86l. Therefore, even when the proximal end portion 87a is caught by another member, the sealing function is maintained on the distal end portion 87b side with respect to the recessed portions 86k and 86l.

  Further, the distal end portion 87b is positioned away from the first cover portion 86, and there is no leakage of the lubricant 88 (from the distal end portion 87b) from the second lubricant accommodating portion 87e (leakage is limited). In the state). Specifically, the distal end portion 87 b is caulked by a portion of the cable 82 positioned outside the first cover portion 86 and the fixing member 89, and moves together with the cable 82. Here, the cable 82 includes a core member 82c and a waterproof coating 82d that covers the outer periphery of the core member 82c. The waterproof coating 82d is made of a synthetic resin material such as nylon or PBT, for example. A waterproof coating 82d is interposed between the tip portion 87b and the core member 82c. The waterproof coating 82d may be provided only in a portion where the fixing member 89 is provided in the cable 82, may be provided over the entire length of the cable 82, or a portion where the fixing member 89 is provided in the cable 82. And may be provided on the outside of the second cover portion 87 and exposed to the outside. The proximal end portion 87a is an example of a first fixing portion, and the distal end portion 87b is an example of a second fixing portion. The waterproof coating 82d is also referred to as a resin part or a film part.

  In the second cover part 87 configured as described above, the expansion / contraction part 87c expands and contracts as the cable 82 moves relative to the first cover part 86.

  Next, the fixing structure of the cable guide 85 will be described in detail. As shown in FIG. 14, in the cable guide 85, the first cover portion 86 is fixed to the back plate 6 by welding portions 90 and 91. The first cover portion 86 is fixed to the back plate 6 at two locations (welded portions 90 and 91) that are separated from each other in the extending direction of the cable 82. Note that the first cover portion 86 may be fixed to the back plate 6 at three or more locations that are separated from each other in the extending direction of the cable 82. The welded portions 90 and 91 are an example of a cable guide fixing portion.

  As shown in FIG. 15, the welded portion 90 is provided across the base end portion 86 a of the first cover portion 86 and the edge of the opening 6 d of the back plate 6 (the surface 6 a of the back plate 6). Yes. Only a part of the entire circumference of the base end portion 86a around the cable 82 (around the central axis of the first cover portion 86) is fixed to the back plate 6 by the welded portion 90.

  As shown in FIGS. 14 and 16, the two welded portions 91 are provided near the distal end portion 87 b of the proximal end portion 87 a and the distal end portion 87 b. The two welded portions 91 fix the first cover portion 86 to the convex portion 6 e provided on the back plate 6. The two welded portions 91 are provided apart from each other around the cable 82 in the first cover portion 86.

  As can be seen from the above, in the present embodiment, the first cover portion 86 (cable guide 85) is a fixing portion different from the fixture 115 that is a fixing portion for fixing the housing 110 (drive mechanism 100) to the back plate 6. It is being fixed to the backplate 6 by the welding parts 90 and 91 which are. That is, the cable guide 85 and the drive mechanism 100 are fixed by different fixing portions.

  Further, as shown in FIG. 5, the base end portion 86 a of the first cover portion 86 is inserted into a second hole portion 113 b provided in the cylindrical portion 112 of the housing 110. A seal member 116 is interposed between the cylindrical portion 112 and the base end portion 86a. The seal member 116 is, for example, an O-ring made of an elastomer. The seal member 116 is placed in a recess 113 e provided in the housing 110. The recess 113e is formed in an annular shape surrounding the base end portion 86a. The seal member 116 seals between the housing 110 and the first cover portion 86.

  In the above configuration, the end of the cable guide 85 on the drive mechanism 100 side is opened in the housing 110, and the end of the cable guide 85 on the brake shoe 3 side is closed.

  As described above, in this embodiment, the cable guide 85 includes the first cover portion 86 having a closed cross section and the second cover portion 87 having a closed cross section. The lubricant 88 is accommodated in the first lubricant accommodating portion 86 i and the second lubricant accommodating portion 87 e of the second cover portion 87. The second cover portion 87 is a base end fixed to the first cover portion 86 in a state where there is no leakage of the lubricant 88 from the first lubricant accommodating portion 86i and the second lubricant accommodating portion 87e. A portion 87a (first fixing portion) and a distal end portion 87b (first fixing portion) which is separated from the first cover portion 86 and fixed to the cable 82 without leakage of the lubricant 88 from the second lubricant accommodating portion 87e. Two fixed portions), and expands and contracts as the cable 82 moves relative to the first cover portion 86. Therefore, for example, wear of the cable guide 85 and the cable 82 is easily suppressed by the lubricant 88 in the cable guide 85. Further, since generation of rust and wear powder in the cable guide 85 and mixing of rust and wear powder from the outside into the cable guide 85 are suppressed, the drive efficiency of the drive mechanism 100 is stabilized and the durability is improved. It is easy to be done. Therefore, for example, in the aspect in which the drive state of the drive mechanism 100 (the motor 120) is controlled based on the drive current value, it is easy to suppress the drive current value from becoming abnormal.

  In the present embodiment, for example, the first cover portion 86 includes two curved portions 86e1, 86b between the proximal end portion 86a and the distal end portion 86b that are both ends in the extending direction of the first cover portion 86. 86e2. Therefore, for example, the force applied to the sliding portion of the first cover portion 86 with the cable 82 is more easily dispersed than when the first cover portion 86 is provided with one curved portion. The durability of the cover part 86 and the cable 82 is easily improved. In addition, the first cover portion 86 can be easily manufactured as compared with the case where the first cover portion 86 is provided with three or more curved portions. In addition, the dimensional accuracy of the first cover part 86 can be easily improved as compared with the case where the entire first cover part 86 is curved.

  In the present embodiment, the first cover portion 86 is fixed to the back plate 6 (support member) at at least two locations (welded portions 90, 91) that are separated from each other in the extending direction of the cable 82. Therefore, for example, the fixing strength of the cable guide 85 and the rigidity of the back plate 6 are easily improved. In the present embodiment, since the first cover portion 86 is fixed to the back plate 6 (support member) by the welded portions 90 and 91, the fixing strength of the cable guide 85 and the rigidity of the back plate 6 are improved. Easy to be further.

  In the present embodiment, an annular seal member 116 interposed between the base end portion 86 a and the housing 110 is placed in the recess 113 e of the housing 110. Therefore, for example, the seal structure is easily simplified as compared with the aspect in which the seal member is interposed between the drive mechanism 100 and the back plate 6 and between the back plate 6 and the cable guide 85.

  In the present embodiment, the base end portion 86 a is made of a metal material, and only a part of the entire circumference around the cable 82 is fixed to the back plate 6 by the welding portion 90. Therefore, the welding time can be shortened compared to the case where the entire circumference of the base end portion 86a is welded.

  In the present embodiment, the cable 82 includes a core member 82c and a waterproof coating 82d that covers the outer periphery of the core member 82c and is interposed between the core member 82c and the base end portion 87a. Therefore, the suction of water due to the capillary phenomenon from the outside to the inside of the second cover portion 87 is suppressed.

  In the present embodiment, the inner diameter of the first cover portion 86 is such that the engagement member 84 provided on the cable 82 can pass through. Therefore, for example, when the drive mechanism 100 is attached / detached, the engagement member 84 can be passed through the first cover portion 86, so that the drive mechanism 100 is easily attached / detached.

  In the present embodiment, an example in which only a part of the entire circumference around the cable 82 in the base end portion 86a of the first cover portion 86 is fixed to the back plate 6 by the welding portion 90 is shown. Not limited to. The entire circumference around the cable 82 at the base end portion 86 a may be fixed to the back plate 6 by the welded portion 90. In this case, for example, it is possible to ensure the fixing strength of the first cover portion 86 and ensure the sealing performance between the back plate 6 and the first cover portion 86. Further, the fixing of the first cover portion 86 and the second cover portion 87 is not limited to the above-described configuration. For example, the base end portion 87a of the second cover portion 87 may be inserted and fixed to the distal end portion 86b of the first cover portion 86.

(Second Embodiment)
The present embodiment shown in FIGS. 17 and 18 is mainly different from the first embodiment in the configuration of the cable guide 85 and the fixing structure.

  As shown in FIG. 17, the cable guide 85 includes a bracket 95 in addition to the first cover portion 86 and the second cover portion 87. The bracket 95 is fixed to the outer periphery of the base end portion 86 a of the first cover portion 86. The bracket 95 has a fixing portion 95 a that is connected to the first cover portion 86 and protrudes to the outside of the first cover portion 86. As shown in FIG. 18, the fixing portion 95 a is fixed to the back plate 6 and the housing 110 by a fixing tool 115. That is, in the present embodiment, the cable guide 85 and the drive mechanism 100 are fastened to the back plate 6 together by the same fixture 115 (fixing portion). In the present embodiment, the welded portions 90 and 91 are not provided. In the present embodiment, the fixture 115 is an example of a shared fixture.

  In the above configuration, for example, the cable guide 85 and the drive mechanism 100 are fixed to the back plate 6 by the same fixing tool 115 (fixing portion), so that the configuration of the brake device 2 is easily simplified. Further, the cable guide 85 and the drive mechanism 100 can be attached and detached, and the replacement workability is improved.

(Third embodiment)
The present embodiment shown in FIG. 19 is mainly different from the first embodiment in the fixing structure of the cable guide 85. In the present embodiment, the cable guide 85 is fixed to the back plate 6 via the plate 96. The plate 96 is fixed to the convex portion 6e together with the plate 97. Specifically, the plate 96 is fixed to the convex portion 6e while being sandwiched between the convex portion 6e and the plate 97. The plate 96 extends toward the first cover portion 86 of the cable guide 85, and the end portion (tip portion) of the plate 96 on the first cover portion 86 side is a first cover portion by the welded portion 91. 86 is fixed. Moreover, in this embodiment, the base end part 86a of the 1st cover part 86 is being fixed to the backplate 6 by the welding part 91 (refer FIG. 15).

  In the above configuration, the welded portion 91 is fixed to the tip portion of the plate 96 extending toward the first cover portion 86 extending from the convex portion 6 e and the first cover portion 86. Therefore, compared with the case where the 1st cover part 86 is welded directly to the convex part 6e, a welding operation is easy.

(Fourth embodiment)
This embodiment shown in FIG. 20 is mainly different from the first embodiment in the shape of the first cover portion 86 of the cable guide 85. In the present embodiment, the small diameter portion 86h2 of the first cover portion 86 is configured to be curved over the entire length. The small diameter portion 86h2 is an example of a bending portion provided between the base end portion 86a and the tip end portion 86b. In addition, the 1st cover part 86 may be comprised by the curved shape over the full length. In this case, when the outer diameter of the first cover part 86 is substantially constant over the entire length, the first cover part 86 is easily bent.

  In the above configuration, for example, the force applied to the sliding portion of the first cover portion 86 with the cable 82 is more easily dispersed than when the linear portion is provided in the small diameter portion 86h2.

(Fifth embodiment)
The present embodiment shown in FIGS. 21 to 24 is mainly different from the first embodiment in the configuration of the cable guide 85. As shown in FIGS. 21 and 22, the cable guide 85 of the present embodiment has a metal member 98 in addition to the first cover portion 86 and the second cover portion 87 (not shown in FIGS. 21 and 22). doing. Moreover, in this embodiment, as FIG. 23 shows, the 1st cover part 86 is comprised by synthetic resin materials, such as nylon and PBT. In addition, an annular recess 86p is provided at the distal end portion 86b of the first cover portion 86, and a convex portion (not shown) of the second cover portion 87 is fitted into the recess 86p. The cover part 86 and the second cover part 87 are fixed to each other. In addition, the shape of the front-end | tip part 86b may be the same as that of 1st Embodiment.

  As shown in FIG. 24, the metal member 98 has a support portion 98a and a fixing portion 98b. The metal member 98 can be made of, for example, the same metal material as that of the back plate 6.

  As shown in FIG. 21, the support portion 98 a has a substantially U-shaped cross section and extends along the outer periphery of the first cover portion 86. The support part 98a supports the first cover part 86 in a state in which a part of the outer periphery of the first cover part 86 is covered. The first cover part 86 is fitted in the support part 98a. A concave portion 98c is provided between both end portions in the extending direction of the support portion 98a. The concave portion 98c facilitates deformation of the support portion 98a, and the support portion 98a can be easily deformed such that the support portion 98a sandwiches the first cover portion 86.

  The fixed portion 98b extends from the end portion of the support portion 98a on the back plate 6 side toward the outside of the first cover portion 86. The fixing portion 98 b is configured in a plate shape along the back plate 6 and is fixed to the back plate 6. A through hole 98d is provided in the fixed portion 98b. The fixing part 98b may be fixed to the back plate 6 and the housing 110 by a fixing tool 115 (not shown in FIG. 21) inserted into the through hole 98d, or fixed to the back plate 6 by a welding part not shown. May be.

  Further, as shown in FIG. 21, the support portion 98a and the first cover portion 86 extend obliquely with respect to the surface 98b1 overlaid on the back plate 6 in the fixing portion 98b.

  With the above configuration, since the first cover portion 86 is made of a synthetic resin material, the cable guide 85 is easily reduced in weight.

  Moreover, in this embodiment, the support part 98a and the 1st cover part 86 are extended diagonally with respect to the surface 98b1 overlaid on the back plate 6 in the fixing | fixed part 98b. Therefore, for example, in the aspect in which the cable 82 is inserted into the back plate 6 obliquely with respect to the wheel axis, the bending amount (angle) for inclining the surface 6a that supports the surface 98b1 of the cable guide 85 in the back plate 6 is set. Can be small or none at all.

(Sixth embodiment)
This embodiment shown in FIG. 25 is mainly different from the first embodiment in the formation of the first cover portion 86 of the cable guide 85.

  The first cover portion 86 of the present embodiment is provided with a diameter changing portion 86q. The diameter changing portion 86q has an outer diameter that decreases from the proximal end portion 86a side toward the distal end portion 86b side. The diameter changing portion 86q is provided with a surface 86r facing the back plate 6. The surface 86r is overlaid on the back plate 6. A through hole 86c passes through the surface 86r. The center 86ca of the through hole 86c in the surface 86r is eccentric with respect to the center 86ra of the surface 86r. As an example, the center 86 ca of the through hole 86 c is eccentric so that it is closer to the inside than the outside of the curve of the first cover portion 86. The center 86ca of the through hole 86c may be eccentric so that it is closer to the outside than the inside of the curve of the first cover portion 86. In this configuration, as an example, a large area of the surface 86r opposite to the eccentric side of the center 86ca of the through hole 86c can be secured. Therefore, a load can be received more on the surface 86r opposite to the eccentric side of the center 86ca of the through hole 86c.

(Seventh embodiment)
The present embodiment shown in FIG. 26 is mainly different from the first embodiment in the shape of the first cover portion 86 of the cable guide 85.

  The first cover portion 86 of the present embodiment has a large diameter portion 86s and a small diameter portion 86t. The large diameter portion 86s extends from the proximal end portion 86a toward the distal end portion 86b. The large diameter portion 86s is fixed to the back plate 6. The small diameter portion 86t extends from the large diameter portion 86s toward the distal end portion 86b. The outer diameter of the small diameter portion 86t is smaller than the outer diameter of the large diameter portion 86s. The diameter of the through hole 86c is substantially constant at the large diameter portion 86s and the small diameter portion 86t. In this configuration, for example, the large-diameter portion 86s can be easily thickened, so that the large-diameter portion 86s can be firmly fixed to the back plate 6 by welding.

  In addition, you may combine the several element in several embodiment mentioned above in the technically possible range.

  An additional note is disclosed regarding the above-described embodiment.

  The vehicle brake includes the cable guide, the braking member, the drive mechanism, the cable, and a support member.

  The first cover portion has a curved portion that is curved between both end portions of the first cover portion.

It has a surface superimposed on the surface of the support member, and includes a fixing portion connected to the first cover portion and projecting outside the first cover portion,
The first cover portion extends obliquely with respect to the surface of the fixed portion.

The first cover part is provided with a first through-hole that includes the first lubricant accommodating part and spans both ends of the first cover part,
The cable guide has a surface that is overlapped with the support member and through which the through hole passes,
The through hole in the surface is eccentric with respect to the center of the surface.

  The first cover portion was fixed to the support member at at least two points spaced from each other in the extending direction of the cable.

The drive mechanism has a housing provided with a recess,
An annular seal member interposed between the base end portion of the first cover portion and the housing was placed in the recess.

  The first cover portion is made of a metal material, and an outer peripheral portion around the cable is fixed to the support member by an annular welded portion surrounding the outer peripheral portion.

  The first cover portion is made of a metal material, and only a part along the circumferential direction of the outer peripheral portion around the cable is fixed to the support member by a welded portion.

The drive mechanism has a housing,
A fixing portion connected to the first cover portion and projecting to the outside of the first cover portion;
The fixing portion was fixed to the housing by a fixing tool.

The first cover portion is supported and has a metal member fixed to the support member,
The first cover portion was made of a synthetic resin material.

  The cable includes a core member and a waterproof coating that covers an outer periphery of the core member and is interposed between the core member and the second fixing portion.

  As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. In addition, the specifications (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, etc. are appropriately changed. Can be implemented.

  For example, in the above embodiment, the brake device 2 is configured as a leading trailing drum brake, but the present invention can also be configured as other types of brake devices.

  DESCRIPTION OF SYMBOLS 1 ... Wheel, 2 ... Brake device (brake for vehicles), 3 ... Brake shoe (braking member), 6 ... Back plate (support member), 82 ... Cable, 85 ... Cable guide, 86 ... First cover part, 86e1 86e2 ... curved portion, 86i ... first lubricant accommodating portion, 87 ... second cover portion, 87e ... second lubricant accommodating portion, 88 ... lubricant, 110 ... housing.

Claims (4)

A cable guide for receiving and guiding a cable that is interposed between a braking member and a driving mechanism and that pulls the braking member so as to brake the wheel by the power of the driving mechanism,
A first lubricant container that is configured in a closed cross section, extends along the cable in a state of covering the cable, and slidably guides the cable, and can store a lubricant between the cable and the cable. A first cover part comprising
A second lubricant containing portion configured in a closed cross section, extending along the cable in a state of covering the cable, connected to the first lubricant containing portion and capable of containing a lubricant between the cables; A first fixing portion configured to be fixed to the first cover portion in a state where there is no leakage of lubricant from the first lubricant accommodating portion and the second lubricant accommodating portion; The cable and the second fixing part fixed to the cable in a state where there is no leakage of lubricant from the second lubricant container, and the cable is fixed to the first cover part. A second cover portion that expands and contracts with relative movement;
With cable guide.   The cable guide according to claim 1, wherein the first cover portion has two curved portions between both end portions in the extending direction of the first cover portion. The cable guide according to claim 1 or 2,
The braking member;
The drive mechanism;
The cable;
A support member;
A driving mechanism fixing portion in which the driving mechanism is fixed to the support member;
A cable guide fixing portion different from the driving mechanism fixing portion, wherein the cable guide is fixed to the support member;
Brake for vehicles equipped with. The cable guide according to claim 1 or 2,
The braking member;
The drive mechanism;
The cable;
A support member;
A common fixing part that fixes the cable guide and the drive mechanism to the support member;
Brake for vehicles equipped with.

Images