JP2021055777A - Connection structure - Google Patents

Abstract

To obtain a connection structure which can secure predetermined sealability even if attachment positions of two members are misaligned.SOLUTION: A connection structure of the disclosure includes: a first member provided with a pipe-like part forming a first opening end of a first passage; a second member provided with a first recessed part that a second opening end of a second passage faces, the second member fixed to the first member; and a seal member disposed between the first member and the second member and forming a third passage which allows the first passage and the second passage to communicate with each other. The seal member includes: a first peripheral wall attached to the pipe-like part at the exterior of the pipe in an elastically extended state, a second peripheral wall attached to the first recessed part in a state where its outer peripheral surface is elastically compressed by an inner peripheral surface of the first recessed part, and a third peripheral wall which is disposed between the first peripheral wall and the second peripheral wall, provided in a state where the third peripheral wall can elastically bend in a direction intersecting with an extension direction of the third passage, and is thinner than the first peripheral wall and the second peripheral wall. The second peripheral wall includes a stopper surface which contacts with the first opening end of the pipe-like part at the first peripheral wall side of the second peripheral wall.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a connection structure.

Conventionally, there is known a vehicle brake that moves and brakes a brake shoe by pulling a cable by rotating a motor (for example, Patent Document 1). In Patent Document 1, for example, a housing of an electric brake unit including a motor and a rotation linear motion conversion mechanism is attached to the back side of a backing plate.

Japanese Unexamined Patent Publication No. 2019-35463

Not limited to vehicle brakes, in a connection structure in which two members (housing and backing plate in the example of Patent Document 1) are connected, water is contained between the two members in one member or in two members. Is not desirable to infiltrate. Further, in such a connection structure, it is desirable that water can be suppressed from entering the members even if the mounting positions of the two members are displaced due to manufacturing variations or the like.

Therefore, one of the problems of the present disclosure is to obtain a connection structure capable of ensuring the required sealing property even when the mounting positions of the two members are displaced from each other, for example.

The connection structure of the present disclosure is, for example, provided with a first member provided with a tubular portion constituting the first opening end of the first passage and a first recess facing the second opening end of the second passage. A second member fixed to the member, and a seal member that is interposed between the first member and the second member and constitutes a third passage that communicates the first passage and the second passage. The sealing member is provided with a first peripheral wall that is attached to the tubular portion in a state of being elastically extended outside the pipe, and an inner peripheral surface of the first recess in the first recess. The second peripheral wall, which is mounted in a state where the outer peripheral surface is elastically compressed by the above, is interposed between the first peripheral wall and the second peripheral wall, and is elastic in the intersecting direction with the extension direction of the third passage. Including the first peripheral wall and the third peripheral wall thinner than the second peripheral wall, the second peripheral wall is provided on the first peripheral wall side of the second peripheral wall. A stopper surface that comes into contact with the first opening end of the tubular portion is provided.

In the above connection structure, the second peripheral wall is provided with a stopper surface that comes into contact with the first opening end of the tubular portion on the first peripheral wall side. According to such a configuration, for example, the entry of the tubular portion of the first member to the second peripheral wall side is suppressed by the stopper surface. That is, it is suppressed that the second peripheral wall receives an external force by the tubular member. As a result, the center (core) position of the second peripheral wall of the sealing member is displaced depending on the center (core) position of the tubular portion, and the sealing property between the outer peripheral surface of the second peripheral wall and the inner peripheral surface of the first recess is improved. It is possible to suppress the inconvenient event that causes the decrease.

FIG. 1 is an exemplary and schematic rear view of the brake device having the connection structure of the embodiment as viewed from the rear of the vehicle. FIG. 2 is an exemplary and schematic cross-sectional view of a part of the braking device having the connection structure of the embodiment, and is a view in a non-braking state. FIG. 3 is an exemplary and schematic cross-sectional view of the seal member used in the connection structure of the embodiment, and is a view in a free state. FIG. 4 is an exemplary and schematic cross-sectional view when the seal member used in the connection structure of the embodiment is attached to the tubular portion (pipe) of the first member.

Hereinafter, exemplary embodiments and modifications of the present invention will be disclosed. The configurations of the embodiments and modifications shown below, and the actions and results (effects) brought about by the configurations are examples. The present invention can also be realized by configurations other than those disclosed in the following embodiments and modifications. Further, according to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration.

Further, in the present specification, the ordinal numbers are given for convenience in order to distinguish parts, parts, etc., and do not indicate the priority order or the order.

Further, the direction in which the end portion 150a of the cable 150 approaches the braking member in the axial direction of the rotation center Ax of the rotating member 141 in FIG. 2 is indicated by D1, and is the axial direction of the rotation center Ax and the end portion of the cable 150. The direction in which the 150a is separated from the braking member is indicated by D2. Further, in the following, unless otherwise specified, the axial direction of the rotation center Ax is simply referred to as the axial direction, the radial direction of the rotation center Ax is simply referred to as the radial direction, and the circumferential direction of the rotation center Ax is simply referred to as the circumferential direction. Will be done. Further, in FIG. 1, the arrow Y indicates the outside in the vehicle width direction, and the arrow Z indicates the upper side of the vehicle.

[Embodiment]
FIG. 1 is a rear view of the brake device 2 for a vehicle from the rear of the vehicle. As shown in FIG. 1, the brake device 2 is housed inside the peripheral wall 1a of the cylindrical wheel 1. The brake device 2 is a so-called drum brake. The brake device 2 includes two brake shoes 3 which are separated from each other in the front-rear direction. The two brake shoes 3 may extend in an arc shape along the inner peripheral surface of a cylindrical drum rotor (not shown) and may have a band-shaped lining 31 on the outer peripheral surface. The drum rotor rotates integrally with the wheel 1 around the rotation center C along the vehicle width direction (arrow Y). The brake device 2 moves the two brake shoes 3 (lining 31) so as to come into contact with the inner peripheral surface of the cylindrical drum rotor. As a result, the friction between the lining 31 (brake shoe 3) and the drum rotor brakes the drum rotor and thus the wheel 1. The brake shoe 3 is an example of a braking member.

The brake device 2 includes a wheel cylinder (not shown) operated by flood control and a motor 120 operated by energization as an actuator for moving the brake shoe 3. The wheel cylinder and the motor 120 can each move two brake shoes 3. The wheel cylinder is used, for example, for braking during traveling, and the motor 120 is used, for example, for braking during parking. That is, the brake device 2 is an example of an electric parking brake. The motor 120 may be used for braking during traveling.

The brake device 2 includes a disk-shaped backing plate 4. The backing plate 4 is provided in a posture intersecting the rotation center C of the wheel 1. That is, the backing plate 4 spreads substantially along the direction intersecting the rotation center C, specifically, substantially along the direction orthogonal to the rotation center C. The components of the brake device 2 are provided on both the outside and the inside of the backing plate 4 in the vehicle width direction. The backing plate 4 directly or indirectly supports each component of the braking device 2. That is, the backing plate 4 is an example of a support member. Further, the backing plate 4 is connected to a connecting member (not shown) with the vehicle body. The connecting member is, for example, a part of the suspension (for example, an arm, a link, a mounting member, etc.). The brake device 2 can be used for both driving wheels and non-driving wheels.

The electric actuator 100 is fixed to the backing plate 4 in a state of protruding from the inner surface 4a of the backing plate 4 in the vehicle width direction to the side opposite to the brake shoe 3. The electric actuator 100 includes a housing 110, a motor 120, a speed reduction mechanism 130, a motion conversion mechanism 140, a cable 150 (FIG. 2), and a control device (not shown).

The housing 110 can be made of, for example, a metal material such as iron or aluminum alloy, or a synthetic resin material such as plastic. The housing 110 is configured by integrating a plurality of parts.

The motor 120 has, for example, a stator, a rotor, a coil, a magnet, an output shaft, and the like (all not shown). The output shaft is part of the rotor. The motor 120 is controlled by a control device to rotate the rotor and output shaft. The motor 120 may also be referred to as an actuator or a rotation source.

The speed reduction mechanism 130 includes a plurality of gears rotatably supported by the housing 110 and rotates in conjunction with the output shaft.

FIG. 2 is a cross-sectional view of a part of the electric actuator 100 in a non-braking state. The electric actuator 100 pulls the brake shoe 3 via the cable 150 to put the brake shoe 3 in the non-braking state into the braking state. The cable 150 penetrates through the through hole 4d provided in the backing plate 4. The cable 150 is an example of an operating member. As shown in FIG. 2, the cable 150 is provided so as to be movable between the non-braking position Pr and the braking position Pb. The non-braking position Pr may also be referred to as the release position. The non-braking position Pr is separated from the braking position Pb in the direction D1 (lower part of FIG. 2), and the braking position Pb is separated from the non-braking position Pr in the direction D2 (upper part of FIG. 2). The directions D1 and D2 correspond to the moving directions of the cable 150 and the cable end 151.

The motion conversion mechanism 140 includes a rotating member 141, a linear motion member 142, and a detent member 143. The motion conversion mechanism 140 is an example of a rotary linear motion conversion mechanism.

The rotating member 141 has a peripheral wall 141a and a flange 141b. The shape of the peripheral wall 141a is a cylinder centered on the rotation center Ax. Inside the peripheral wall 141a, a through hole 141c along the axial direction is provided. The center of rotation Ax is an example of the central axis.

The shape of the flange 141b is annular and plate-like. The flange 141b projects radially outward from the peripheral wall 141a. A third gear 133 of the reduction mechanism 130 is provided on the outer periphery of the flange 141b. The rotation of the rotor and the output shaft of the motor 120 is transmitted to the rotating member 141 via the reduction mechanism 130. The rotating member 141 rotates in conjunction with the rotor of the motor 120. The speed reduction mechanism 130 may also be referred to as a rotation transmission mechanism.

The peripheral wall 141a has a first extension portion 141a1 extending from the flange 141b in the direction D2 and a second extension portion 141a2 extending from the flange 141b in the direction D1. The length of the first extension portion 141a1 is longer than the length of the second extension portion 141a2.

A male screw 141d is provided on the outer circumference of the first extension portion 141a1. The center of the male screw 141d is the center of rotation Ax. The center of rotation Ax may also be referred to as the axis of rotation.

A radial bearing 161 such as a slide bush or a roller bearing is provided between the outer circumference of the second extension portion 141a2 and the inner circumference of the through hole 112a of the base 112. Further, a thrust bearing 162 such as a roller bearing is provided between the end surface 141b1 in the direction D1 of the flange 141b and the end surface 112b in the direction D2 of the base 112. The rotating member 141 is rotatably supported by the base 112 around the center of rotation Ax via these radial bearings 161 and thrust bearings 162. The rotating member 141 is rotationally driven by the second gear 132 by meshing the second gear 132 and the third gear 133 of the reduction gear mechanism 130. The base 112 is an example of a first support member.

The third gear 133 is made of a synthetic resin material such as plastic, and the disk 141b2 of the peripheral wall 141a and the flange 141b excluding the third gear 133 can be made of a metal material such as iron or an aluminum alloy. In this embodiment, iron is used as an example. In this case, the rotating member 141 can be configured, for example, by insert molding. The rotating member 141, including the third gear 133, may be integrally formed of a metal material.

The linear motion member 142 has a side wall 142a and a flange 142b. The side wall 142a is arranged radially outward with respect to the rotating member 141 and extends in the axial direction. The side wall 142a surrounds the rotation center Ax and the rotation member 141, and the shape of the side wall 142a is a cylinder centered on the rotation center Ax. The side wall 142a may also be referred to as a peripheral wall. Inside the side wall 142a, a through hole 142c is provided along the axial direction. The rotating member 141 penetrates through the through hole 142c in the axial direction.

The shape of the flange 142b is polygonal and plate-like. The flange 142b projects radially outward from the side wall 142a.

The side wall 142a has a first extension 142a1 extending from the flange 142b in the direction D2 and a second extension 142a2 extending from the flange 142b in the direction D1. The length of the first extension 142a1 is longer than the length of the second extension 142a2.

On the inner surface of the through hole 142c, a female screw 142d that meshes with the male screw 141d of the rotating member 141 is provided. The female screw 142d is provided adjacent to the end of the through hole 142c in the direction D1. The female screw 142d is provided in the section from the end of the through hole 142c in the direction D1 to the position where it is aligned radially with the flange 142b, and is not provided in the end of the through hole 142c in the direction D2. Further, the flange 142b is surrounded by a detent member 143 extending in the axial direction.

The detent member 143 has a side wall 143a. The side wall 143a is arranged radially outward with respect to the flange 142b and extends axially. The side wall 143a surrounds the rotation center Ax and the rotation member 141, and the shape of the side wall 143a is tubular. The side wall 143a may also be referred to as a peripheral wall.

The detent member 143 is fixed to a housing 110 such as a cover 111 or a base 112. Therefore, it can be said that the detent member 143 is a part of the housing 110. Further, a minute gap is provided between the outer surface 142b1 of the flange 142b and the inner surface 143a1 of the side wall 143a in a state parallel to each other, and both the outer surface 142b1 and the inner surface 143a1 extend in a direction intersecting the circumferential direction. ..

Therefore, the rotation of the outer surface 142b1 around the rotation center Ax is restricted by the inner surface 143a1, and thereby the rotation of the linear motion member 142 is restricted by the rotation prevention member 143. On the other hand, since both the outer surface 142b1 and the inner surface 143a1 extend in the axial direction, the inner surface 143a1 does not hinder the axial movement of the outer surface 142b1. That is, the detent member 143 can guide the linear motion member 142 along the axial direction (linear motion direction) while prohibiting the rotation of the linear motion member 142 around the rotation center Ax. The detent member 143 is an example of the second support member. The inner surface 143a1 may also be referred to as a guide portion.

At the end of the detent member 143 in the direction D2, a bottom wall 143b protruding inward in the radial direction from the side wall 143a is provided. The bottom wall 143b is provided with a through hole 143b1 that penetrates in the axial direction. The bottom wall 143b has an annular and plate-like shape, and may also be referred to as an inward flange. The inner edge of the through hole 143b1 is arranged radially outward from the side wall 142a of the linear motion member 142.

The cable 150 penetrates the through hole 141c of the rotating member 141 and extends in the axial direction. One end in the axial direction (not shown) is coupled to a movable member that operates the brake shoe 3. Further, a cable end 151 is coupled to an end portion 150a (upper end in FIG. 2) as the other end in the axial direction. The cable end 151 has a tubular portion 151a and a flange 151b. The cable end 151 is fixed to the cable 150 by crimping the tubular portion 151a from the outside. The flange 151b projects radially outward from the side wall 142a of the linear motion member 142 and the bottom wall 143b of the detent member 143. The cable 150 and cable end 151 can be made of, for example, a metallic material. The cable end 151, along with the cable 150, is an example of an actuating member. The cable end 151 is an example of a fixing member.

The cable end 151 and the linear motion member 142 are not integrated and are configured to be separable in the axial direction. Here, the cable 150 is pulled in a direction (direction D1, downward in FIG. 2) in which the braking member is in the non-braking state by a return member (a urging member, an elastic member) such as a spring (not shown). The electric actuator 100 is configured so that the urging force of the return member always acts on the cable 150 within the movement range of the cable 150 (the range in which the brake is used). However, due to the configuration of the brake device 2, the urging force of the return member becomes smaller as the braking state approaches the non-braking state. Further, in the braking state, tension is generated in the cable 150 according to the rigidity of the drum brake. In such a configuration, a force is transmitted between the linear motion member 142 and the cable 150 via the cable end 151. Therefore, the cable end 151 can also be referred to as a transmission member (first transmission member).

The control device that controls the motor 120 is, for example, an ECU (electronic control unit). A part of the control device may be composed of hardware such as a central processing unit (CPU) or a controller that executes software, or the control device may be composed entirely of hardware. The control device may also be referred to as a control unit.

The motor 120 is an example of an actuator, and has a case 121 and a housing component housed in the case 121. The accommodating parts include, for example, a stator, a rotor, a coil, a magnet (not shown), and the like, in addition to the shaft 122. The shaft 122 projects from the case 121 in the direction D1 (lower side of FIG. 2) along the first rotation center Ax1 of the motor 120. The motor 120 is driven by driving power based on the control signal to rotate the shaft 122. The shaft 122 may be referred to as an output shaft.

The reduction mechanism 130 includes a plurality of gears rotatably supported by the housing 110. The plurality of gears are, for example, the first gear 131, the second gear 132, and the third gear 133.

The first gear 131 rotates integrally with the shaft 122 of the motor 120. The first gear 131 may be referred to as a drive gear. The second gear 132 rotates around a 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 rotation speed lower than that of the first gear 131. The output gear 132b is located behind the input gear 132a in the direction D1 (downward in FIG. 2). The second gear 132 may be referred to as an idler gear. The third gear 133 rotates around a rotation center Ax 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 rotation speed lower than that of the second gear 132. The third gear 133 may be referred to as a driven gear. The configuration of the speed reduction mechanism 130 is not limited to that exemplified here. The speed reduction mechanism 130 may be a rotation transmission mechanism other than the gear mechanism, such as a rotation transmission mechanism using a belt, a pulley, or the like.

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 male screw 141d of the rotating member 141 and the female screw 142d of the linear motion member 142 The linear motion member 142 moves in the axial direction due to the meshing of the members and the limitation of the rotation of the outer surface 142b1 of the linear motion member 142 by the inner surface 143a1 of the detent member 143. Therefore, the cable 150 moves between the braking position Pb and the non-braking position Pr along the axial direction as the linear motion member 142 moves.

The rotation of the shaft 122 of the motor 120 controlled by the control device in one direction (hereinafter referred to as braking rotation direction) causes the cable 150 to move in the direction D2, and when the braking member is in the braking state, the tension of the cable 150 is increased. This increases, which increases the rotational load of the motor 120, which in turn increases the drive current of the motor 120. Therefore, for example, the control device detects that the cable 150 has reached the braking position Pb because the drive current of the motor 120 exceeds the threshold value, and stops supplying the drive current to the motor 120 at that time. As a result, the rotation of the output shaft is stopped, and the cable 150 is located at the braking position Pb.

The rotation of the motor 120 shaft 122 in the other direction (hereinafter referred to as the release rotation direction) controlled by the control device causes the cable 150 to move from the braking position Pb to the direction D1, and the cable end 151 of the detent member 143. It moves to the non-braking position Pr in contact with the bottom wall 143b. In this state, the braking member is separated from the rotating member (not shown, for example, the brake drum), and the electric braking state by the electric actuator 100 is released. The bottom wall 143b restricts the cable end 151 from moving beyond the bottom wall 143b to the side opposite the braking position Pb from the non-braking position Pr, that is, in the direction D1. The detent member 143 is an example of a stopper. Further, the bottom wall 143b may also be referred to as a positioning portion for positioning the cable 150 at the non-braking position Pr, and the detent member 143 may also be referred to as a movement limiting member.

Further, as described above, in the present embodiment, the cable end 151 and the linear motion member 142 are not integrated and can be separated in the axial direction. Therefore, when the shaft 122 of the motor 120 further rotates in the release rotation direction from the state where the cable 150 is arranged at the non-braking position Pr, the male screw 141d and the female screw 142d are engaged with each other and the rotation of the linear motion member 142 by the detent member 143. By stopping, the linear motion member 142 is separated from the cable end 151 in the direction D1. That is, in a state where the cable 150 is arranged at the non-braking position Pr and the operation of the motor 120 is stopped, a gap is formed in the axial direction between the linear motion member 142 and the cable end 151.

The control device measures the time (rotation time) for rotating the motor 120 from the state where the cable 150 is in the braking position Pb and the number of rotations of the shaft 122, so that the linear motion member 142 moves from the cable end 151 to the direction D1. The operation of the motor 120 is stopped at a position where the motor 120 is separated. At this time, the rotation time and the number of rotations are set between the stopped linear motion member 142 and another member (for example, the second gear 132, the flange 141b of the rotary member 141, etc.) separated from the linear motion member 142 in the direction D1. In other words, it is set so as not to come into contact with or interfere with other members.

Further, as shown in FIG. 2, the electric actuator 100 includes a coil spring (not shown) that urges the cable 150 in the direction D1. The coil spring is interposed between the bottom wall 111a (wall) of the cover 111 separated from the cable end 151 in the direction D2 and the flange 151b of the cable end 151, and its winding center is arranged along the rotation center Ax. , The cable end 151 is urged in the direction D1 with respect to the housing 110. The coil spring is a so-called compression spring that is incorporated in an elastically compressed state and is used in a compressed state within its operating range. The coil spring urges the cable end 151 in direction D1 with respect to the cover 111 (housing 110) in both the non-braking position Pr and the braking position Pb of the cable 150 and the cable end 151. .. The coil spring may be a trapezoidal spring whose diameter gradually decreases toward the direction D1 or a trapezoidal spring whose diameter gradually decreases toward the direction D2. The coil spring may also be referred to as a first urging member. The coil spring is not an essential component.

Further, the electric actuator 100 has a rotating member 141 and a guide member 113 adjacent to the direction D1. The guide member 113 has an annular shape and guides the cable 150 inside the through hole 112a of the base 112. The guide member 113 is made of, for example, an elastomer or a synthetic resin material. A ring (not shown) adjacent to the guide member 113 and the direction D1 may be provided. The ring is made of an elastic material such as an elastomer, is interposed between the guide member 113 and the stepped surface 112c of the base 112 in the axial direction, and is incorporated in a state of being elastically compressed in the axial direction. The guide member 113 and thus the rotating member 141 are urged against the housing 110) in the direction D2, and the rotating member 141 is pressed against the linear motion member 142 or the detent member 143 (housing 110). The ring may also be referred to as a second urging member. Instead of the ring, a second urging member having a form different from that of the elastomer, such as a disc spring or a coil spring, may be provided.

As shown in FIG. 2, the housing 110 (base 112) is fixed to the backing plate 4. The backing plate 4 and the housing 110 (base 112) are connected by a binder 62 such as a screw. The backing plate 4 is provided with a surface 4a intersecting the rotation center Ax at a position facing the housing 110. Further, the housing 110 is provided with an end surface 110a intersecting the rotation center Ax at a position facing the backing plate 4. The backing plate 4 and the housing 110 are connected with the surface 4a and the end surface 110a in contact with each other. The binder 62 is not limited to the screw, and may be a binder different from the screw, such as a rivet. Further, in the following, the bonded state between the backing plate 4 and the housing 110 is simply referred to as a bonded state.

The end surface 110a of the housing 110 is provided with a bottomed cylindrical recess 110b. The shape of the side surface 110c of the recess 110b is a cylindrical surface. Further, an open end 112d of the through hole 112a is provided at a substantially central position of the bottom surface 110d of the recess 110b. In other words, the recess 110b faces the open end 112d of the through hole 112a. The bottom surface 110d of the recess 110b is annular and flat. The bottom surface 110d may also be referred to as a stepped surface or a flange surface. The through hole 112a is a passage of the cable 150 and is an example of the second passage. Further, the opening end 112d is an example of the second opening end, the recess 110b is an example of the first recess, and the housing 110 (base 112) is an example of the second member.

The backing plate 4 is provided with a through hole 4d at a position facing the recess 110b in the combined state. Further, a reinforcing plate 61 extending along the backing plate 4 is provided on the opposite side of the housing 110 (base 112) with respect to the backing plate 4 in the combined state. The reinforcing plate 61 is provided with a through hole 61a that overlaps with the through hole 4d. A pipe 84 is fixed to the backing plate 4 by, for example, welding. The pipe 84 penetrates the through hole 61a and the through hole 4d. Further, the tip portion including the end portion 84a of the pipe 84 has entered the recess 110b in a coupled state. The passage 84b in the pipe 84 is a passage of the cable 150 and is an example of the first passage. Further, the end portion 84a is an example of the first open end, the pipe 84 (the tip portion) is an example of the tubular portion, and the backing plate 4 is an example of the first member.

A seal member 200 as shown in FIG. 3 is arranged in the recess 110b. The sealing member 200 is generally tubular and is attached to both the pipe 84 and the housing 110 (base 112) to form the passage 200a of the cable 150. The passage 200a constitutes a third passage between the passage 84b (first passage) and the through hole 112a (second passage) in the pipe 84. That is, in the present embodiment, the sealing member 200 has a required sealing property even when the mounting position is displaced between the two members to be connected, that is, the pipe 84 and the housing 110 (base 112). To secure. Therefore, the backing plate 4, the pipe 84, the housing 110 (base 112), and the seal member 200 constitute the connection structure 170.

As shown in FIGS. 3 and 4, the seal member 200 includes, for example, an elastomer 210 and a core member 220. The elastomer 210 has an integrally molded first peripheral wall 211, a second peripheral wall 212, and a third peripheral wall 213. In the present embodiment, as an example, the elastomer 210 is molded with the core member 220 set in the molding die (not shown) of the elastomer 210. That is, the elastomer 210 and the core member 220 are integrated by insert molding. The elastomer 210 is made of, for example, a rubber-based material, and may be made of a soft synthetic resin or the like. Note that FIG. 3 is an example of a cross-sectional view showing the seal member 200 in a free state before being mounted on the pipe 84. Further, FIG. 4 is an example of a cross-sectional view of the seal member 200 showing a state of being mounted on the pipe 84.

As shown in FIG. 4, the first peripheral wall 211 is attached to the outer peripheral surface of the tip portion of the pipe 84 in a state of being elastically extended outside the pipe. Therefore, the first peripheral wall 211 seals between the inner circumference thereof and the outer periphery of the tip end portion of the pipe 84.

As shown in FIG. 4, the second peripheral wall 212 is attached to the recess 110b of the housing 110 in a state of being elastically compressed by the side surface 110c. Further, the seal member 200 is in a state in which the end surface 212a of the second peripheral wall 212 of the seal member 200 and the bottom surface 110d of the recess 110b are in contact with each other or a slight gap t is maintained (FIG. 4 shows a state in which the gap t is open). Is arranged in the recess 110b. That is, the seal member 200 is arranged in the recess 110b, and the second peripheral wall 212 is arranged in a state where it is not compressed (a state where it is not crushed) with respect to the direction D2. In this way, the second peripheral wall 212 seals between the outer circumference thereof and the inner circumference (side surface 110c) of the recess 110b. As shown in FIG. 3, the outer diameter of the second peripheral wall 212 becomes smaller as it approaches the end face 212a, and the workability when pushing into the recess 110b is improved while maintaining the sealing performance. ..

The third peripheral wall 213 is provided between the first peripheral wall 211 and the second peripheral wall 212. As shown in FIGS. 3 and 4, the thickness t3 of the third peripheral wall 213 is smaller than the thicknesses t1 and t2 of the first peripheral wall 211 and the second peripheral wall 212. In other words, the third peripheral wall 213 is thinner than the first peripheral wall 211 and the second peripheral wall 212. Further, as shown in FIG. 4, the third peripheral wall 213 is provided so as to be bendable in a direction intersecting the extending direction (direction D2) of the passage 200a. For example, even if misalignment (eccentricity) occurs in the direction along the surface 4a (end surface 110a) between the housing 110 (base 112) and the pipe 84 caused by the dimensional tolerance between the recess 110b and the pipe 84, the misalignment amount. Is absorbed by the bending of the third peripheral wall 213. As a result, a structure is realized in which the surface pressure on the inner circumference (side surface 110c) of the outer peripheral recess 110b of the second peripheral wall 212 is kept substantially uniform over the entire circumference and the sealing performance between the two is maintained. Similarly, by bending the third peripheral wall 213, the surface pressure on the inner circumference of the first peripheral wall 211 and the outer circumference of the tip portion of the pipe 84 is kept substantially uniform over the entire circumference, and the sealing performance between the two is maintained. Realize.

By the way, the pipe 84 made of a hard material such as metal is often used in a bent state, and there are variations in shape. When such a pipe 84 is inserted into the passage 200a of the seal member 200, if the end portion 84a of the pipe 84 further enters the region of the second peripheral wall 212, the second peripheral wall 212 becomes the pipe 84. It may imitate (deform) the shape. That is, the eccentric absorption effect due to the bending of the third peripheral wall 213 cannot be sufficiently obtained. As a result, the surface pressure on the inner circumference (side surface 110c) of the outer peripheral recess 110b of the second peripheral wall 212 may become partially non-uniform (seal biased state), and the sealing performance between the two may deteriorate. is there.

Therefore, the second peripheral wall 212 of the seal member 200 of the present embodiment is provided with a stopper surface 214 that comes into contact with the end portion 84a (first opening end) of the pipe 84 on the first peripheral wall 211 side of the second peripheral wall 212. ing. In the case of the present embodiment, the stopper surface 214 is provided at an end portion (end surface) of the second peripheral wall 212 facing the first peripheral wall 211 as an example. The stopper surface 214 can be formed, for example, as a part of a ridge portion 212b protruding toward the inner diameter side at a position on the first peripheral wall 211 side of the inner peripheral surface of the second peripheral wall 212. The inner diameter of the ridge portion 212b is formed to be smaller than the outer diameter of the pipe 84 on which the seal member 200 is mounted. That is, when the seal member 200 is attached to the pipe 84 from the side of the first peripheral wall 211, the end portion 84a of the pipe 84 abuts on the stopper surface 214 and is inserted into the region of the second peripheral wall 212 beyond that. Is suppressed. That is, the eccentricity of the pipe 84 does not contribute to the shape of the second peripheral wall 212, the eccentric absorption effect due to the bending of the third member is sufficiently exerted, and the inner circumference (side surface 110c) of the concave portion 110b on the outer periphery of the second peripheral wall 212 is sufficiently exhibited. ) Is kept substantially uniform over the entire circumference, and the sealing property between the two is maintained. The stopper surface 214 may also be referred to as a contact surface or an insertion prevention surface. Further, the ridge portion 212b may also be referred to as a protrusion portion, a contact portion, or a shoulder portion.

Further, by providing the stopper surface 214 on the second peripheral wall 212, when the pipe 84 is inserted into the seal member 200, the end portion 84a comes into contact with the stopper surface 214 without considering the excessive insertion as described above. Can be pushed in. As a result, it is possible to prevent the pipe 84 from being completely mounted in an inclined posture with respect to the seal member 200, and stable assembly work can be performed. Therefore, the surface pressure on the inner circumference of the first peripheral wall 211 and the outer circumference of the tip portion of the pipe 84 can be kept substantially uniform over the entire peripheral region, and the sealing property between the two can be maintained. Further, when the work of attaching the seal member 200 to the pipe 84 is performed, the end portion 84a comes into contact with the stopper surface 214, so that a reaction force is generated. As a result, it is possible to determine whether or not the completion of the insertion work of the pipe 84 is correct or not depending on the presence or absence of the reaction force from the stopper surface 214. For example, even when the assembly work is performed by an operator or an automatic assembly machine, it is possible to easily determine whether or not the insertion (mounting) is completed. As a result, it can contribute to the improvement and stabilization of assembly quality.

As shown in FIGS. 3 and 4, the connection position between the second peripheral wall 212 and the third peripheral wall 213 is on the outer peripheral side of the stopper surface 214. In this case, the connection position may be on the outer peripheral side where the end portion 84a of the pipe 84 does not come into contact with the third peripheral wall 213 when the end portion 84a is inserted into the seal member 200. Therefore, the connection position may partially overlap the region defined as the stopper surface 214 as long as the end portion 84a does not come into contact with the third peripheral wall 213. With this structure, when the pipe 84 is inserted toward the stopper surface 214, it is possible to prevent the end portion 84a from coming into contact with the third peripheral wall 213. As a result, for example, the third peripheral wall 213, which is thinner than the first peripheral wall 211 and the second peripheral wall 212, is affected by the contact with the end portion 84a, or the third peripheral wall 213 and the end portion are affected. It is possible to avoid the inconvenience that the free bending of the third peripheral wall 213 is hindered by the contact with the 84a and the eccentric absorption effect of the pipe 84 with respect to the recess 110b is reduced.

Further, the inner peripheral diameter of the second peripheral wall 212 is increased from the inner peripheral diameter D11 on the stopper surface 214 side to the inner peripheral diameter D12 on the side facing the opening end 112d (second opening end). That is, the inner peripheral surface of the second peripheral wall 212 is a tapered surface. That is, the rigidity of the stopper surface 214 (convex portion 212b) is reduced by thinning. As a result, for example, even when the pipe 84 is inserted in an inclined state, the stopper surface 214 easily follows the inclination, and the insertion posture of the pipe 84 affects the surface pressure of the outer peripheral surface of the second peripheral wall 212. It is possible to reduce the possibility of doing so.

In the case of FIGS. 3 and 4, the stopper surface 214 is provided at the end of the second peripheral wall 212 facing the first peripheral wall 211. In this case, it is possible to prevent the pipe 84 from applying an external force that reduces the sealing performance of the second peripheral wall 212 to the second peripheral wall 212. That is, the stable sealing performance of the second peripheral wall 212 can be sufficiently exhibited. Further, since the stopper surface 214 is provided at the end of the first peripheral wall 211 side, the pipe 84 is not restrained from the second peripheral wall 212. That is, the pipe 84 supported (sealed) by the first peripheral wall 211 can be smoothly displaced with respect to the second peripheral wall 212 due to the bending effect of the third peripheral wall 213, and the misalignment is sufficiently absorbed. Will be done. As a result, the sealing performance of the first peripheral wall 211 can be sufficiently exhibited.

In this way, the stopper surface 214 may be designed so that the pipe 84 is not inserted in a range where the second peripheral wall 212 affects the surface pressure on the side surface 110c. Therefore, in the modified example, the stopper surface 214 may be set at a position shifted from the end surface of the second peripheral wall 212 on the first peripheral wall 211 side to the opening end 112d side, for example. In this case, the pipe 84 does not have to apply an external force to the core member 220 existing inside the second peripheral wall 212. When the core member 220 receives an external force from the pipe 84, the core member 220 moves following the pipe 84, and the second peripheral wall 212 (elastomer 210) surrounding the core member 220 also moves. As a result, the surface pressure on the outer peripheral surface of the second peripheral wall 212 becomes non-uniform, and the sealing performance deteriorates. On the other hand, if the stopper surface 214 is set so that the insertion of the pipe 84 can be stopped within the range where the external force from the pipe 84 does not reach the core member 220, the position of the core member 220 does not move from the pipe 84. The external force of is applied only to the elastomer 210 of the second peripheral wall 212. In this case, the elasticity of the elastomer 210 absorbs the external force from the pipe 84. That is, it is possible to suppress the change in the surface pressure of the outer peripheral surface of the second peripheral wall 212.

As described above, there is a degree of freedom in the forming position of the stopper surface 214, which can contribute to the improvement of the design degree of freedom of the stopper surface 214.

In the above description, an example is shown in which the stopper surface 214 is formed on the ridge portion 212b protruding toward the inner diameter side of the second peripheral wall 212. That is, an example is shown in which the stopper surface 214 is formed in a ring shape on the first peripheral wall 211 side of the second peripheral wall 212. In this case, a stopper surface 214 having a stable contact surface can be obtained. In the modified example, the stopper surface 214 may be formed intermittently at equal intervals in the inner peripheral direction of the second peripheral wall 212, for example. In this case, the material cost of the elastomer 210 can be reduced, which can contribute to the cost reduction. Further, when the pipe 84 is tilted and inserted into the seal member 200, the stopper surface 214 can be easily followed by the end portion 84a, and the insertion posture of the pipe 84 is the surface of the outer peripheral surface of the second peripheral wall 212. It is possible to reduce the influence on the pressure.

Further, in the seal member 200 shown in FIG. 3, an example in which the stopper surface 214 is formed as a part of the second peripheral wall 212 has been described, but the stopper surface 214 may be formed by another member. For example, by mounting a ring-shaped stopper member on the second peripheral wall 212, a seal member 200 having the same stopper surface 214 as in FIG. 3 may be realized. For example, if the stopper member is made of metal, a hard synthetic resin, or the like, the wear performance of the pipe 84 can be improved. Further, the rigidity of the second peripheral wall 212 can be increased. In this case, for example, a part of the core member 220 may be projected toward the first peripheral wall 211 side of the inner diameter of the second peripheral wall 212 to have a stopper surface function, and the same effect can be obtained. Can be done.

As described above, in the present embodiment, the seal member 200 includes the first peripheral wall 211 mounted on the pipe 84 (tubular portion) provided on the backing plate 4 (first member) and the housing 110 (second member). It has a second peripheral wall 212 attached to the recess 110b (first concave portion) provided in the member), and a third peripheral wall 213 located between the first peripheral wall 211 and the second peripheral wall 212. The third peripheral wall 213 is provided so as to be elastically bendable in the direction of intersection with the extending direction of the passage 200a (third passage). Further, the third peripheral wall 213 is thinner than the first peripheral wall 211 and the second peripheral wall 212. Therefore, according to the present embodiment, for example, even when the pipe 84 and the recess 110b are attached in a state of being displaced in the eccentric direction, the third peripheral wall 213 is oriented in the above-mentioned crossing direction (deviation direction, eccentric direction). Due to the elastic bending deformation of the seal member 200, the sealability of the seal member 200 in the connection structure 170 between the pipe 84 and the housing 110 can be easily ensured while suppressing the local stress increase and thus the damage of the seal member 200. Further, for example, the second peripheral wall 212 includes a stopper surface 214 that comes into contact with the end portion 84a (first opening end) of the pipe 84 on the first peripheral wall 211 side of the second peripheral wall 212. Therefore, according to the present embodiment, for example, when the seal member 200 is attached to the pipe 84 from the first peripheral wall 211 side, the end portion 84a of the pipe 84 comes into contact with the stopper surface 214, and the second portion beyond that. It is possible to prevent the peripheral wall 212 from being inserted into the region. As a result, it is possible to prevent the pipe 84 from deforming the second peripheral wall 212, and the surface pressure on the inner circumference (side surface 110c) of the concave portion 110b on the outer periphery of the second peripheral wall 212 is kept substantially uniform over the entire peripheral region. It is possible to improve the maintenance performance of the sealing property between the two.

Further, in the present embodiment, for example, the connection position between the second peripheral wall 212 and the third peripheral wall 213 is set to the outer peripheral side from the stopper surface 214. Therefore, according to the present embodiment, for example, when the pipe 84 is inserted toward the stopper surface 214, it is possible to prevent the end portion 84a from coming into contact with the third peripheral wall 213. As a result, the thin third peripheral wall 213 is affected by the durability due to the contact with the end portion 84a of the pipe 84, or the third peripheral wall 213 is free due to the contact between the third peripheral wall 213 and the end portion 84a. It is possible to avoid the inconvenience that the bending is hindered and the eccentric absorption effect of the pipe 84 with respect to the recess 110b is reduced.

Further, in the present embodiment, for example, the inner peripheral diameter of the second peripheral wall 212 is increased from the stopper surface 214 side to the side facing the opening end 112d (second opening end). Therefore, according to the present embodiment, for example, the rigidity of the stopper surface 214 (convex portion 212b) can be reduced by thinning. As a result, for example, even when the pipe 84 is inserted in an inclined state, the stopper surface 214 easily follows the inclination, and the insertion posture of the pipe 84 affects the surface pressure of the outer peripheral surface of the second peripheral wall 212. It is possible to reduce the possibility of doing so.

Further, in the present embodiment, for example, the seal member 200 is formed of an elastomer 210. Therefore, according to the present embodiment, for example, high sealing performance for the housing 110 and the pipe 84 can be obtained by the elasticity of the elastomer 210. Further, by forming the stopper surface 214 with the elastomer 210, for example, when the seal member 200 is attached to the pipe 84, the correctness of the completion of the insertion work of the pipe 84 is determined based on the presence or absence of the reaction force from the stopper surface 214. It becomes possible to make it. Therefore, it can contribute to the improvement and stabilization of assembly quality. The seal member 200 may be at least elastic and water resistant, but may be further provided with, for example, oil resistance and heat resistance. The seal member 200 may be made of, for example, a synthetic resin material in addition to the elastomer 210.

Further, in the present embodiment, for example, the stopper surface 214 is provided at the end of the second peripheral wall 212 facing the first peripheral wall 211. Therefore, according to the present embodiment, it is possible to reliably prevent the pipe 84 from being inserted into the inner peripheral portion of the second peripheral wall 212. As a result, it is possible to prevent the pipe 84 from applying an external force that reduces the sealing performance of the second peripheral wall 212 to the second peripheral wall 212, so that the stable sealing performance of the second peripheral wall 212 can be sufficiently exhibited. Can be done. Further, the pipe 84 can be prevented from being restrained from the second peripheral wall 212. That is, the pipe 84 supported (sealed) by the first peripheral wall 211 can be smoothly displaced with respect to the second peripheral wall 212 due to the bending effect of the third peripheral wall 213, and the first peripheral wall 211 makes it possible to smoothly displace the pipe 84. The sealing performance can be fully exhibited.

Although the embodiments and modifications of the present invention have been illustrated above, the above-described embodiments and modifications are merely examples, and the scope of the invention is not intended to be limited. The above-described embodiment and modification can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the gist of the invention. In addition, specifications such as each configuration and shape (structure, type, direction, type, size, length, width, thickness, height, number, arrangement, position, material, etc.) are changed as appropriate. Can be carried out.

1 ... Wheel, 2 ... Brake device, 4 ... Backing plate (first member), 84 ... Pipe (tubular part), 84a ... End (first opening end), 84b ... Passage (first passage), 110 ... Housing (Second member), 110b ... Recessed (first recess), 112a ... Through hole (second passage), 112d ... Open end (second opening end), 200 ... Seal member, 200a ... Passage (third passage), 211 ... 1st peripheral wall, 212 ... 2nd peripheral wall, 213 ... 3rd peripheral wall, 214 ... Stopper surface.

Claims (5)

A first member provided with a tubular portion constituting the first opening end of the first passage, and
A second member, which is provided with a first recess facing the second opening end of the second passage and is fixed to the first member,
A seal member that is interposed between the first member and the second member and constitutes a third passage that communicates the first passage and the second passage.
It is a connection structure with
The seal member is
The first peripheral wall, which is attached to the tubular portion in a state of being elastically extended outside the tube,
A second peripheral wall mounted on the first recess with the outer peripheral surface elastically compressed by the inner peripheral surface of the first recess.
It is provided between the first peripheral wall and the second peripheral wall so as to be elastically bendable in the direction of intersection with the extending direction of the third passage, and the first peripheral wall and the second peripheral wall are provided. With a thinner third wall,
Including
The second peripheral wall is a connection structure provided with a stopper surface in contact with the first opening end of the tubular portion on the first peripheral wall side of the second peripheral wall. The connection structure according to claim 1, wherein the connection position between the second peripheral wall and the third peripheral wall is on the outer peripheral side of the stopper surface. The connection structure according to claim 1 or 2, wherein the inner peripheral diameter of the second peripheral wall is increased from the stopper surface side to the side facing the second opening end. The connection structure according to any one of claims 1 to 3, wherein the seal member is formed of an elastomer. The connection structure according to any one of claims 1 to 4, wherein the stopper surface is provided at an end of the second peripheral wall facing the first peripheral wall.

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