JP7210352B2 - vehicle brake - Google Patents

Description

The present disclosure relates to vehicle brakes.

Conventionally, a drum brake is known in which one end of a shoe hold-down pin is supported by a backing plate (Patent Document 1). In this drum brake, a spring is arranged on the opposite side of the backing plate with respect to the brake shoe, and the spring is interposed between the other end of the shoe hold-down pin and the brake shoe. A spring supported at the other end biases the brake shoe toward the backing plate. The shoe hold-down pin is supported by being pushed against the backing plate by the biasing force of the spring.

Japanese Unexamined Patent Application Publication No. 2011-2071

In this type of drum brake, when installing or removing the shoe hold-down pin, the spring is elastically compressed, so it is necessary to support the shoe hold-down pin on both sides of the backing plate in the vehicle width direction. It was time consuming and costly.

Therefore, one of the objects of the present invention is, for example, to create a new brake shoe that makes it possible to reduce the labor and cost required for assembling and replacing parts necessary for urging the brake shoe toward the backing plate. To obtain a vehicle brake having a simple structure.

A vehicle brake according to the present disclosure includes, for example, a backing plate having a first surface facing in a first direction parallel to the center of rotation of a wheel, and a backing plate movably provided along the first surface to brake the wheel. a braking member; a first supporting member provided in a state of protruding from the first surface in the first direction; and a biasing member supported by the first supporting member and biasing the braking member toward the first surface. a force member; and a second support member having an elastic body attached to the backing plate and supporting the first support member in a swingable manner, the elastic body connecting the first support member to the backing plate. In order to be detachable from and to be supported on the opposite side of the first direction so that it can be prevented from coming off, it has a portion that is flexibly deformable in a radial direction that intersects with the first direction, and the portion is in the radial direction The stopper is prevented from coming off by abutting against the first surface in a state of being open toward the outside .

Since the drum brake has, for example, the second support member that is attached to the backing plate and rockably supports the first support member, the worker can easily assemble the first support member. can be done. Therefore, for example, there is an advantage that labor and costs in assembly work and maintenance work are easily reduced compared to a conventional structure in which support members need to be supported from both sides in the vehicle width direction. .

FIG. 1 is a schematic and exemplary side view of the vehicle brake of the first embodiment when viewed outward in the vehicle width direction. FIG. 2 is a cross-sectional view taken along the line II--II in FIG. 3 is a schematic and exemplary side view of the assembly of the first embodiment; FIG. 4 is a schematic and exemplary perspective view of the assembly of the first embodiment; FIG. FIG. 5 is a schematic and exemplary cross-sectional view of the vehicle brake of the second embodiment at the same position as in FIG. FIG. 6 is a schematic and exemplary perspective view of the second support member of the second embodiment as seen from the inside in the vehicle width direction. FIG. 7 is a schematic and exemplary perspective view of the second support member of the second embodiment as seen from the outside in the vehicle width direction. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 6. FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 6. FIG. FIG. 10 is a schematic and exemplary cross-sectional view of a second support member of a modified example of the second embodiment at the same position as in FIG.

Illustrative embodiments of the invention are disclosed below. The configurations of the embodiments shown below and the actions and results (effects) brought about by the configurations are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Moreover, according to the present invention, at least one of various effects (including derivative effects) obtained by the configuration can be obtained.

Also, the embodiments and variations disclosed below include similar components. Therefore, hereinafter, common reference numerals are given to those similar components, and duplicate descriptions are omitted. In this specification, ordinal numbers are used only to distinguish parts, members, regions, positions, directions, etc., and do not indicate order or priority.

Moreover, all drawings are schematic and exemplary. Hereinafter, in each figure, the arrow X indicates the front of the vehicle, the arrow Y indicates the outer side in the vehicle width direction, and the arrow Z indicates the upper side of the vehicle. The front X, the vehicle width direction outer Y, and the upper Z are orthogonal to each other. It should be noted that, in the following description, unless otherwise specified, the direction indicates the direction in which the device is installed in the vehicle.

[First embodiment]
[Configuration of brake device]
FIG. 1 is a side view of the brake device 10 as viewed outward in the vehicle width direction, and FIG. 2 is a sectional view taken along line II-II of FIG.

The braking device 10 is housed inside a cylindrical wheel peripheral wall (not shown). The brake device 10 is a so-called drum brake. The brake device 10 has two brake shoes 11 (see FIG. 2, but only one is shown) separated in the front-rear direction. Only one of the two brake shoes 11 is shown in FIG. The two brake shoes 11 extend arcuately along the inner peripheral surface of a cylindrical drum rotor (not shown). The drum rotor rotates integrally with the wheel around a rotation center C along the vehicle width direction (direction Y). The brake device 10 moves two brake shoes 11 so as to come into contact with the inner peripheral surface of a cylindrical drum rotor. As a result, the friction between the brake shoe 11 and the drum rotor brakes the drum rotor and the wheel. The brake shoe 11 is an example of a braking member. The brake device 10 is an example of a vehicle brake.

The brake device 10 includes, as actuators for moving the brake shoes 11, a wheel cylinder (not shown) operated by hydraulic pressure and an electric actuator 100 (a motor 120 thereof) operated by energization. The wheel cylinder and electric actuator 100 can each move two brake shoes 11 . The wheel cylinders are used, for example, for braking while the vehicle is running, and the electric actuator 100 is used, for example, for braking during parking. That is, the brake device 10 is an example of an electric parking brake. The electric actuator 100 may be used for braking during running.

The braking device 10 has a backing plate 12 . The shape of the backing plate 12 is substantially disc-shaped. The backing plate 12 is provided in a posture that intersects the center of rotation C of the wheel. That is, the backing plate 12 spreads generally along the direction intersecting the center of rotation C, specifically along the direction perpendicular to the center of rotation C. As shown in FIG.

The backing plate 12 is connected to a connecting member (not shown) for connection with the vehicle body. The connecting member is, for example, part of the suspension (eg, arm, link, mounting member, etc.). The braking device 10 of this embodiment can be applied to both drive wheels and non-drive wheels.

Also, the backing plate 12 directly or indirectly supports each component of the brake device 10 . Components of the brake device 10 are arranged both on the vehicle width direction outer side and inner side of the backing plate 12 . The wheel cylinders, the brake shoes 11, and the like are provided outside the outer surface 12a of the backing plate 12 in the vehicle width direction. Further, as shown in FIG. 1, the electric actuator 100 is provided inside the inner surface 12b of the backing plate 12 in the vehicle width direction. As shown in FIG. 2, the outer surface 12a and the inner surface 12b each intersect the vehicle width direction and are substantially orthogonal to the vehicle width direction. The outer surface 12a faces outward in the vehicle width direction, and the inner surface 12b faces inward in the vehicle width direction. The outer surface 12a is an example of the first surface, and the vehicle width direction outward (direction Y) is an example of the first direction.

[Configuration of electric actuator]
The electric actuator 100 is fixed to the backing plate 12 on the side opposite to the brake shoes 11 with respect to the inner surface 12b of the backing plate 12 on the inner side in the vehicle width direction. The electric actuator 100 includes a housing 110, a motor 120, a deceleration mechanism 130, a motion conversion mechanism 140, a cable (not shown), and a controller (not shown).

As shown in FIG. 1, the housing 110 extends in a circumferential direction, a tangential direction, or parallel to a direction orthogonal to the center of rotation C of the wheel. Further, when viewed in the axial direction of the rotation center C, the housing 110 extends in a direction crossing and orthogonal to the radial direction. However, the position, attitude, extension direction, etc. of the housing 110 are not limited to this example.

As shown in FIG. 1 , housing 110 supports motor 120 , speed reduction mechanism 130 , and motion conversion mechanism 140 . Housing 110 has lower case 111 and upper case 112 . The housing 110 has an overall elongated cylindrical shape, and a cylindrical lower case 111 and a cylindrical upper case 112 are connected in series. The lower case 111 and the upper case 112 are integrated by means of fasteners such as screws and bolts, insert molding, or the like.

Lower case 111 is made of, for example, a metal material such as an aluminum alloy. In this case, the lower case 111 can be manufactured by die casting, for example. The base end 111a of the lower case 111 is fixed to the inner surface 12b of the backing plate 12 in the vehicle width direction by means of a fastener such as welding, screws or bolts. The proximal end 111 a is the proximal end of the electric actuator 100 . The lower case 111 is also called a base, a body, or the like.

Also, the upper case 112 is made of, for example, a synthetic resin material such as plastic.

In such a configuration, the motor 120 is housed in the upper case 112 and the motion conversion mechanism 140 is housed in the lower case 111 . At least one of lower case 111 and upper case 112 accommodates speed reduction mechanism 130 .

The motor 120 has, for example, a stator, rotor, coils, magnets, an output shaft, etc. (none of which are shown). The output shaft is part of the rotor. Motor 120 is controlled by a controller to rotate the rotor and output shaft. Motor 120 may also be referred to as an actuator or a source of rotation.

The reduction mechanism 130 includes a plurality of gears rotatably supported by the housing 110, rotates in conjunction with the output shaft of the motor 120, and reduces speed.

The motion conversion mechanism 140 has a rotating member, a linear motion member, and a detent guide (all not shown). The motion conversion mechanism 140 is an example of a rotation/linear motion conversion mechanism.

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

In the above configuration, the rotation of the output shaft of motor 120 is transmitted to the rotating member of motion conversion mechanism 140 via reduction mechanism 130 . The motion converting mechanism 140 has, for example, a screw mechanism. In this case, the rotating member is provided with one of the male thread and the female thread that mesh with each other, and the linear motion member is provided with the other of the male thread and the female thread. The housing 110 is provided with a detent guide that restricts the rotation of the linear motion member and guides it in the linear motion direction. In such a configuration, the detent guide restricts the rotation of the linear motion member and guides the linear motion member in the linear motion direction, so the linear motion member linearly moves according to the rotation of the rotary member. As the linear motion member linearly moves, an operating member such as a cable or rod interlocking with the linear motion member linearly moves, and in conjunction with the operating member, the brake shoe 11 moves between a braking position (not shown) and a non-braking position. It moves to and from a braking position (not shown). The state in which the brake shoe 11 is positioned at the braking position is the braking state, and the state in which the brake shoe 11 is positioned at the non-braking position is the non-braking state.

[Schematic configuration of drum brake]
Each of the brake shoes 11 has a substantially arc shape. As shown in FIG. 2, the brake shoe 11 has a shoe web 11a and a shoe rim 11b. The shape of the shoe web 11a is a plate-like and arc-like shape that intersects the vehicle width direction. The shoe rim 11b has a partial cylindrical shape along the inner peripheral surface (not shown) of the peripheral wall of the drum rotor. extends along. As shown in FIG. 2, the shoe web 11a and the shoe rim 11b are integrated in a substantially T-shape in a cross section parallel to the vehicle width direction. A lining 11c is fixed to the outer peripheral surface of the shoe rim 11b by adhesion or the like. The support mechanism 200 slidably (movably) supports the brake shoe 11 along the outer surface 12 a of the backing plate 12 .

[Brake shoe support mechanism]
As shown in FIG. 2, the support mechanism 200 has a pin assembly 210, a coil spring 220 and a retainer 230. As shown in FIG.

3 is a side view of the pin assembly 210 included in the support mechanism 200, and FIG. 4 is a perspective view of the pin assembly 210. FIG. As shown in FIGS. 3 and 4, pin assembly 210 has pin 211 and retaining member 212 . The pin assembly 210 is plane-symmetrical with respect to a virtual plane passing through the center axis Ax of the extension 211a of the pin 211 and along the plane of FIG. It is symmetrical with respect to Hereinafter, the axial direction of the central axis Ax is simply referred to as the axial direction, the radial direction of the central axis Ax is simply referred to as the radial direction, and the circumferential direction of the central axis Ax is simply referred to as the circumferential direction. Pin assembly 210 is one example of an assembly.

The pin assembly 210 is moved in the direction I1 from the inner side of the backing plate 12 in the vehicle width direction (the left side in FIG. 2) in a posture extending along the vehicle width direction as shown in FIG. , and attached to the backing plate 12 with the flange 211b of the pin 211 and the holding member 212 sandwiching the edge of the through hole 12c in the vehicle width direction. Through hole 12c is an example of an opening. The direction I1 is also referred to as the insertion direction or mounting direction of the pin assembly 210, and in the present embodiment is the vehicle width direction outward as an example.

In this embodiment, as an example, the pin 211 is made of a metallic material such as ferrous material, and the holding member 212 is made of an elastomer such as synthetic rubber. The holding member 212 is integrated with the pin 211 by adhesion, integral molding (insert molding), or the like. The holding member 212 is fixed so as to surround the extension 211 a of the pin 211 . In other words, as shown in FIG. 2, extension 211a is integrated with holding member 212 while penetrating through hole 212a provided in holding member 212 . In addition, a rotation preventing structure or a retaining structure may be provided between the outer peripheral surface of the extension portion 211a and the inner peripheral surface of the through hole 212a. The holding member 212 is an example of an elastic body.

As shown in FIG. 2 , the pin 211 protrudes outward in the vehicle width direction from the outer surface 12a of the backing plate 12 . Pin 211 is an example of a first support member.

As shown in FIG. 3, the pin 211 has an extension 211a, a flange 211b and a hook 211c. Note that the flange 211b can also be called a bottom or wide end, and the hook 211c can also be called a head or a narrow end. In the mounting posture shown in FIG. 2, the flange 211b is positioned inside the extending portion 211a in the vehicle width direction, and the hook 211c is positioned outside the extending portion 211a in the vehicle width direction. That is, the flange 211b is the inner end of the pin 211 in the vehicle width direction, and the hook 211c is the outer end of the pin 211 in the vehicle width direction.

The extending portion 211a has a substantially columnar shape and extends in the vehicle width direction.

The flange 211b protrudes radially outward from the outer peripheral surface 211a1 of the extension 211a at the vehicle width direction outer end of the extension 211a. An end surface 211b1 on the inner side in the vehicle width direction of the flange 211b has a circular planar shape orthogonal to the vehicle width direction. The outer end surface 211b2 of the flange 211b in the vehicle width direction has a conical shape, and the outer diameter of the end surface 211b2 gradually tapers outward in the vehicle width direction.

Moreover, the hook 211c has a half-moon and plate shape. The hook 211c has two vehicle width direction inner end faces 211c1 and 211c2 and a vehicle width direction outer end face 211c3.

One end surface 211c1 protrudes leftward in FIG. 3 from the outer peripheral surface 211a1 of the extending portion 211a, and the other end surface 211c2 protrudes from the outer peripheral surface 211a1 of the extending portion 211a to the right in FIG. protrudes to Both of the end faces 211c1 and 211c2 face inward in the vehicle width direction and have a substantially rectangular shape.

Further, the end face 211c3 has a curved cylindrical shape protruding outward in the vehicle width direction from the tip of the end faces 211c1 and 211c2.

Further, as shown in FIG. 4, the outer diameter D1 of the extension portion 211a is greater than the thickness Th1 of the hook 211c, the maximum width W1 of the hook 211c is greater than the outer diameter D1, and the backing is greater than the maximum width W1. The inner diameter D2 (see FIG. 2) of the through hole 12c of the plate 12 is large, and the outer diameter D3 of the flange 211b is larger than the inner diameter D2. That is, the expression Th1<D1<W1<D2<D3 holds for the thickness Th1, the outer diameter D1, the maximum width W1, the inner diameter D2, and the outer diameter D3.

Therefore, the pin 211 can be inserted into the through hole 12c of the backing plate 12 from the hook 211c side. As shown in FIG. 2, the extension 211a extends along the vehicle width direction, the hook 211c is positioned outside the extension 211a in the vehicle width direction, and the flange 211b is positioned inside the extension 211a in the vehicle width direction. As for the posture, it can be inserted into the through hole 12c from the inside of the backing plate 12 in the vehicle width direction as shown by the arrow I1 (direction I1), and the end surface 211b2 of the flange 211b contacts the edge of the through hole 12c. You can move it to any position. Here, as described above, the outer diameter D3 of the flange 211b is larger than the inner diameter D2 of the through hole 12c. Therefore, in the mounting posture of the pin assembly 210 to the backing plate 12 shown in FIG. function as a retainer for the outer side in the vehicle width direction.

On the other hand, as shown in FIG. 2, the holding member 212 is partially inserted into the through hole 12c of the backing plate 12 and extends outwardly from the through hole 12c in the vehicle width direction when attached to the pin assembly 210. partially protruding or exposed. Hereinafter, the portion of the holding member 212 that is inserted into the through hole 12c is referred to as a first portion 212b, and the portion that protrudes or is exposed outward in the vehicle width direction from the through hole 12c is referred to as a second portion 212c (FIGS. 4). The first portion 212b is adjacent to the flange 211b on the outside in the vehicle width direction, and the second portion 212c is adjacent to the first portion 212b on the outside in the vehicle width direction. The first portion 212b may also be referred to as an inner portion or an insertion portion, and the second portion 212c may also be referred to as an outer portion, a protruding portion, or an exposed portion.

As shown in FIGS. 3 and 4, the first portion 212b has two side surfaces 212b1, two projecting surfaces 212b2, and two inclined surfaces 212b3.

The two side surfaces 212b1 are orthogonal to the radial direction and parallel to each other. The two protruding surfaces 212b2 have convex curved and cylindrical shapes extending substantially along the circumferential direction, and are positioned between the two side surfaces 212b1. The distance from the central axis Ax of the projecting surface 212b2 is greater than the distance from the central axis Ax of the side surface 212b1.

Here, in this embodiment, the maximum width W2 (see FIG. 4) between the two projecting surfaces 212b2 is larger than the inner diameter D2 (see FIG. 2) of the through hole 12c. Therefore, the first portion 212b is inserted into the through-hole 12c in an elastically compressed state, in other words, is press-fitted. Further, in this embodiment, the width W6 (see FIG. 3) between the two side surfaces 212b1 is smaller than the inner diameter D2 of the through hole 12c. Therefore, even when the first portion 212b is press-fitted, a gap is formed between the two side surfaces 212b1 and the edge (inner peripheral surface) of the through hole 12c. It becomes easy to swing in the direction in which the two side surfaces 212b1 face (the left-right direction in FIG. 3).

The inclined surfaces 212b3 are positioned on the side opposite to the flange 211b with respect to the projecting surface 212b2, that is, adjacent to the outer side in the vehicle width direction, and are inclined away from the central axis Ax as they are closer to the flange 211b. With this configuration, the inclined surface 212b3 functions as a guide when the pin assembly 210 is moved in the direction I1 and the first portion 212b is inserted into the through hole 12c. In addition, although the inclined surface 212b3 has a planar shape, it is not limited to this.

Also, the second portion 212c has two side surfaces 212c1, two projecting surfaces 212c2, and two claws 212c3.

The two side surfaces 212c1 are orthogonal to the radial direction and parallel to each other. The two protruding surfaces 212c2 have convex curved and cylindrical shapes substantially along the circumferential direction, and are positioned between the two side surfaces 212c1. The distance from the central axis Ax of the projecting surface 212c2 is greater than the distance from the central axis Ax of the side surface 212c1.

The two side surfaces 212b1 of the first portion 212b and the two side surfaces 212c1 of the second portion 212c are axially offset and circumferentially offset by 90°. The two protruding surfaces 212b2 of the first portion 212b and the two protruding surfaces 212c2 of the second portion 212c are axially shifted and circumferentially shifted by 90°.

As shown in FIG. 3 , the claw 212c3 is positioned adjacent to the flange 211b side, that is, the inner side in the vehicle width direction with respect to each projecting surface 212c2. It protrudes while being inclined inward in the vehicle width direction and radially outward so as to separate from the . Further, the outer surface 212c4 of the claw 212c3 is inclined away from the central axis Ax as it is closer to the flange 211b. A recessed portion 212c5 recessed outward in the vehicle width direction is provided radially inward with respect to the tip of the claw 212c3. Here, the inner diameter D2 of the through-hole 12c of the backing plate 12 is larger than the width W4 between the root portions of the two claws 212c3, that is, the maximum width W4 between the two projecting surfaces 212c2, and the inner diameter D2 is larger than the inner diameter D2. A width W5 between the tips of the claws 212c3 is large. That is, a formula of W4<D2<W5 holds for the width W4, the inner diameter D2, and the width W5.

With this configuration, outer surface 212c4 acts as a guide when pin assembly 210 is moved in direction I1 (see FIG. 2) and second portion 212c is inserted into through hole 12c. Further, when the second part 212c is inserted into the through hole 12c, if the outer surface 212c4 shown in FIG. , a radially inward force acts from the edge of the through hole 12c. As a result, the claw 212c3 elastically bends radially inward and retracts. Furthermore, when the pin assembly 210 is moved in the direction I1, the first portion 212b is inserted into the through hole 12c, and the pawl 212c3 is pulled out of the through hole 12c, the force from the edge of the through hole 12c disappears. As a result, as shown in FIG. 2, the claw 212c3 returns radially outward due to elasticity, and the claw 212c3 overlaps the edge of the through hole 12c on the outside in the vehicle width direction. As a result, the claw 212c3 functions to prevent the pin assembly 210 from coming off inward in the vehicle width direction. Thus, the claws 212c3, the outer surface 212c4, and the flange 211b can function as a snap fit mechanism 240 when attaching the retaining member 212 to the edge of the through hole 12c. In addition, in the mounted state, the circumference of the edge of the through hole 12c is in contact with both the claw 212c3 and the flange 211b, and is elastically sandwiched between the claw 212c3 and the flange 211b. As a result, the pin assembly 210 is attached to the backing plate 12 while protruding outwardly from the backing plate 12 in the vehicle width direction. The holding member 212 swingably supports the pin 211 by its elasticity. The holding member 212 is an example of a second support member.

Further, as shown in FIG. 2, a bottom wall 230a of the cup-shaped retainer 230 is provided with a through hole 230b through which the hook 211c of the pin 211 is passed. The bottom wall 230a is perpendicular to the central axis Ax, and the cross section perpendicular to the central axis Ax of the through hole 230b has an oval or rectangular shape elongated in the direction perpendicular to the paper surface of FIG. It penetrates in the axial direction (vehicle width direction). Further, the bottom wall 230a accommodates the hook 211c in a posture in which the longitudinal direction of the hook 211c and the longitudinal direction of the through hole 230b are perpendicular to each other, that is, the posture shown in FIG. A recess 230c is provided to limit the rotation of the . A portion of the bottom wall 230a forming the recess 230c functions as a detent for the hook 211c and thus the pin assembly 210. As shown in FIG. In addition, since the anti-rotation prevents the hook 211c from coming out of the through hole 230b inward in the vehicle width direction, the bottom wall 230a provided with the recess 230c also functions as a retaining mechanism for the pin assembly 210. there is

In addition, the coil spring 220 is elastically disposed between the peripheral edge portion 230d of the retainer 230 and the shoe web 11a (brake shoe 11) while surrounding the pin assembly 210 with its winding center extending in the vehicle width direction. intervening in a compressed state. The coil spring 220 is supported by the hook 211c of the pin 211 through the retainer 230 and biases the shoe web 11a toward the outer surface 12a of the backing plate 12. As shown in FIG. Coil spring 220 is an example of a biasing member. Note that the biasing member may be different from the coil spring 220, such as a leaf spring.

Referring to FIG. 2, the assembly work of the support mechanism 200 will be described. First, the operator inserts the shoe web 11a into the backing plate 12 with the pin assembly 210 attached to the through hole 12c of the backing plate 12. , the hook 211c and extension 211a of the pin 211 are passed through the through hole 11a1 of the shoe web 11a, and the shoe web 11a is brought into contact with the outer surface 12a of the backing plate 12 at a predetermined position. The direction I2 is also referred to as the insertion direction or mounting direction of the pin 211, and as an example, is the vehicle width direction inward.

Next, with the coil spring 220 interposed between the shoe web 11a and the retainer 230, the operator brings the retainer 230 closer to the hook 211c in the direction I2 from the outside in the vehicle width direction. Then, the operator presses the retainer 230 inward in the vehicle width direction, thereby elastically compressing the coil spring 220 in the vehicle width direction, and inserts the hook 211c into the through hole 230b. Finally, the operator rotates the retainer 230 by 90° around the central axis Ax with the hook 211c passing through the through hole 230b, and releases the pressing force inward in the vehicle width direction, thereby moving the hook 211c into the recess 230c. fit inside. Thereby, the support mechanism 200 is attached to the backing plate 12 .

Further, as shown in FIG. 1, in this embodiment, the electric actuator 100 covers the through hole 12c of the backing plate 12 from the inside in the vehicle width direction. With such a configuration, after the electric actuator 100 is attached, the operator cannot support the pin assembly 210 from the inside in the vehicle width direction as in the conventional art. In this regard, in the present embodiment, the operator attaches the pin assembly 210 before the electric actuator 100 is attached, so that the pin 211 protrudes substantially outward in the vehicle width direction from the backing plate 12. The state can be maintained, and the worker can attach the shoe web 11a, the coil spring 220, and the retainer 230 without supporting the pin 211 from the inside of the backing plate 12 in the vehicle width direction.

As described above, in this embodiment, the pin 211 (first support member) is attached to the backing plate 12 via the holding member 212 (second support member). With such a configuration, the operator does not need to support the pins from both sides of the backing plate, unlike the conventional configuration in which the pins are attached to the backing plate by the elastic force of the elastic member. Attachment and detachment of the containing pin assembly 210 can be performed more easily or more quickly.

Further, in this embodiment, the holding member 212 , at least a part of which is an elastic body, supports the pin 211 so as to swing with respect to the backing plate 12 . Therefore, the pin 211 can swing following the movement of the brake shoe 11 between the braking position and the release position. Such a configuration prevents the brake shoe 11 from becoming difficult to move due to the pin 211 , for example, the brake shoe 11 is caught on the pin 211 .

Also, in this embodiment, the holding member 212 has a snap-fit mechanism 240 that attaches the pin assembly 210 (assembly) including the pin 211 to the backing plate 12 . With such a configuration, an operator can, for example, attach the pin 211 to the backing plate 12 more easily or more quickly.

Further, in this embodiment, the holding member 212 is attached to the edge of the through hole 12 c (opening) of the backing plate 12 . With such a configuration, for example, the operator can more easily or quickly attach the holding member 212 to the backing plate 12 using the through hole 12c.

Moreover, in the present embodiment, at least part of the holding member 212 is inserted into the through hole 12c. According to such a configuration, the holding member 212 can prevent water from entering the drum brake through the through hole 12c.

[Second embodiment]
FIG. 5 is a cross-sectional view of the support mechanism 200A of the brake device 10A of this embodiment at the same position as in FIG. As shown in FIG. 5, the support mechanism 200A has pins 211, holding members 250, coil springs 220, and spring retainers 230A. The pin 211 and the coil spring 220 respectively have the same configurations as the pin 211 and the coil spring 220 of the first embodiment. However, the holding member 250 is different from the holding member 212 of the first embodiment. The spring retainer 230A may be different from the retainer 230 of the first embodiment, or may have the same configuration.

Further, in the first embodiment, the pin 211 and the holding member 212 are fixedly integrated as the pin assembly 210, whereas in the present embodiment, the pin 211 and the holding member 250 are detachable (separable). possible). In the first embodiment, the holding member 212 attached to the backing plate 12 is fixed near the flange 211b of the pin 211. 211c is detachably held. Along with this, the posture of the pin 211 is opposite to that of the first embodiment. That is, in this embodiment, the hook 211c is positioned inside the backing plate 12 in the vehicle width direction, and the flange 211b is positioned outside the backing plate 12 in the vehicle width direction. The pin 211 is an example of a first support member, and the holding member 250 is an example of a second support member.

Furthermore, the point that the pin 211 is attached to the holding member 250 after the holding member 250 is independently attached to the backing plate 12 is also different from the first embodiment. That is, in the present embodiment, the holding member 250 is attached to the backing plate 12 so as to approach the backing plate 12 from the inside in the vehicle width direction in the direction I1. After that, when the coil spring 220 is set, the pin 211 is brought close to the backing plate 12 in the direction I2 from the outside in the vehicle width direction, and is exposed outside the backing plate 12 in the vehicle width direction of the holding member 250. The hook 211 c is inserted into the holding member 250 from the portion, and the hook 211 c is held inside the holding member 250 . The direction I1 is also referred to as the insertion direction or the mounting direction of the holding member 250, and in the present embodiment is the vehicle width direction outward as an example. The direction I2 is also referred to as the insertion direction or mounting direction of the pin 211, and in the present embodiment is the vehicle width direction inward as an example.

6 is a perspective view of the holding member 250 seen from the inside in the vehicle width direction, FIG. 7 is a perspective view of the holding member 250 seen from the outside in the vehicle width direction, FIG. 8 is a cross-sectional view of VIII-VIII in FIG. , and FIG. 9 is a sectional view taken along line IX-IX of FIG. In the drawing, the central axis Ax is the central axis of the holding member 250 and also the central axis of the pin 211 attached to the holding member 250 .

As shown in FIGS. 6 and 7, holding member 250 has body 251 and cover 252 . Moreover, as shown in FIGS. 8 and 9, the holding member 250 further has a retainer 230 . The retainer 230 has the same configuration as the retainer 230 of the first embodiment.

In this embodiment, as an example, body 251 and cover 252 are made of an elastomer such as synthetic rubber. Body 251 and cover 252 are an example of an elastic body. 8 and 9, the cover 252 covers the opening of the recess 251b3 in a state where the retainer 230 is accommodated in the recess 251b3 of the body 251, and the peripheral edge 251b5 of the opening and the peripheral edge 252a of the cover 252 are aligned. are fixed, the body 251, the cover 252, and the retainer 230 are integrated. The body 251 and the cover 252 are joined by adhesion, for example, but not limited to this.

As shown in FIGS. 6 and 7, the body 251 has legs 251a attached to the backing plate 12 and a cup 251b that accommodates the retainer 230. As shown in FIGS. The leg portion 251a may also be referred to as a mounting portion, and the cup 251b may also be referred to as an accommodating portion.

As shown in FIGS. 6 to 9, the leg 251a is provided with a recessed groove 251c that is recessed radially inward from the outer periphery of the leg 251a at a position adjacent to the cup 251b in the axial direction. The groove 251c surrounds the outer periphery of the leg portion 251a. As shown in FIG. 5, the holding member 250 is inserted into the groove 251c by inserting the edge of the through-hole 12c of the backing plate 12 into the groove 251c. It is attached to the backing plate 12 by holding the edge of the through-hole 12c between adjacent portions (bottom wall 251b1 and part of the peripheral wall 251f) on both sides.

An outer peripheral surface 251d of a portion of the leg portion 251a adjacent to the concave groove 251c on the vehicle width direction outer side has a tapered shape that tapers toward the vehicle width direction outer side. With such a configuration, the outer peripheral surface 251d functions as a guide when the holding member 250 is moved in the direction I1 and the leg portion 251a is inserted into the through hole 12c. Further, when the leg portion 251a is inserted into the through-hole 12c, if the outer peripheral surface 251d abuts the edge of the through-hole 12c, the inclination of the outer peripheral surface 251d causes the outer peripheral surface 251d and the peripheral wall 251f to move toward the through-hole. A radially inward force acts from the edge of 12c. As a result, the peripheral wall 251f elastically bends radially inward. Furthermore, when the holding member 250 is moved in the direction I1 and the edge of the through-hole 12c is inserted into the groove 251c, the force from the edge of the through-hole 12c disappears, and the peripheral wall 251f elastically moves radially outward. As a result, portions of the holding member 250 adjacent to both sides of the groove 251c in the vehicle width direction (parts of the bottom wall 251b1 and the peripheral wall 251f) sandwich the edge of the through hole 12c. Thus, the peripheral wall 251f, the outer peripheral surface 251d, and the bottom wall 251b1 can function as a snap-fit mechanism 240A when attaching the holding member 250 to the through hole 12c. An enlarged portion 251e1 (diameter enlarged portion) is provided at the outer end portion in the vehicle width direction of the opening 251e inside the peripheral wall 251f so that the peripheral wall 251f is appropriately bent. The leg portion 251a is an example of a mounting portion.

As shown in FIGS. 8 and 9, the leg portion 251a is provided with an opening 251e through which the hook 211c of the pin 211 is passed. The opening 251e penetrates the leg portion 251a in the vehicle width direction (axial direction). As described in the first embodiment, the hook 211c has a rectangular cross-sectional shape perpendicular to the central axis Ax. Therefore, the cross-sectional shape of the opening 251e in the axial direction is elongated in the longitudinal direction of the cross section of the hook 211c and short in the short side direction of the cross section of the hook 211c so that the hook 211c can pass through. Alternatively, it has a rectangular shape. 8 shows a cross section of the holding member 250 along the lateral direction of the opening 251e, and FIG. 9 shows a cross section of the holding member 250 along the longitudinal direction of the opening 251e. The minor axis Ds1 (see FIG. 8) of the opening 251e is longer than the thickness Th1 (see FIG. 4) of the hook 211c, and the major axis Dl1 (see FIG. 9) of the opening 251e is the maximum width W1 (see FIG. 4) of the hook 211c. ).

Further, as shown in FIGS. 6 and 7, the cross-sectional shape of the leg portion 251a forming the peripheral wall 251f surrounding the opening 251e, which is perpendicular to the central axis Ax, conforms to the cross-sectional shape of the opening 251e. has an oval shape. In the present embodiment, the cross section perpendicular to the central axis Ax of the through hole 12c of the backing plate 12 also has an elongated shape in accordance with the shape of the leg portion 251a. The leg portion 251a and the edge of the through hole 12c function as a detent that restricts the rotation of the leg portion 251a and thus the holding member 250 relative to the backing plate 12 about the central axis Ax.

As shown in FIG. 5, when the holding member 250 is attached to the backing plate 12, the outer end of the leg portion 251a in the vehicle width direction and the opening 251e protrude or are exposed to the outer side of the backing plate 12 in the vehicle width direction. are doing.

As shown in FIGS. 8 and 9, the cup 251b has a bottom wall 251b1 and a peripheral wall 251b2. The bottom wall 251b1 has a disc shape orthogonal to the central axis Ax, and the peripheral wall 251b2 has a conical shape that widens inward in the vehicle width direction. A retainer 230 is accommodated in a recess 251b3 surrounded by the bottom wall 251b1 and the peripheral wall 251b2.

The bottom wall 251b1 and the peripheral wall 251b2 have a shape adapted to the retainer 230 and have a detent structure to prevent the retainer 230 from rotating around the central axis Ax.

Here, as described in the first embodiment, the bottom wall 230a of the retainer 230 is provided with the recess 230c that restricts the rotation of the hook 211c around the central axis Ax. The bottom wall 230a is orthogonal to the central axis Ax, and the recessed portion 230c is recessed outward in the vehicle width direction. It has a circular or rectangular shape. The minor axis Ds2 (see FIG. 9) of the recess 230c is slightly longer than the thickness Th1 (see FIG. 4) of the hook 211c, and the major axis Dl2 (see FIG. 8) of the recess 230c is the maximum width W1 (see FIG. 4) is slightly longer. When the hook 211c is accommodated, the rotation of the hook 211c about the central axis Ax is restricted by the bottom wall 230a of the retainer 230 forming the recess 230c having such a cross-sectional shape.

As shown in FIG. 5, bottom wall 230a supports hook 211c. 8 and 9, the longitudinal direction of the opening 251e provided in the leg portion 251a (the direction perpendicular to the paper surface of FIG. 8, the lateral direction of FIG. 9) and the longitudinal direction of the recess 230c of the retainer 230 ( 8 and the direction perpendicular to the paper surface of FIG. 9) are perpendicular to each other, and the short direction of the opening 251e (the left and right direction of FIG. 8 and the direction perpendicular to the paper surface of FIG. 9) and the width direction of the concave portion 230c. The hand direction (the direction perpendicular to the paper surface of FIG. 8, the left-right direction in FIG. 9) is orthogonal to each other. That is, there is a difference of 90° around the central axis Ax between the attitude in which the hook 211c is supported by the bottom wall 230a and the attitude in which the hook 211c can pass through the through hole 230b. Therefore, the bottom wall 230a supports the hook 211c, that is, the pin 211, and prevents the hook 211c from rotating through the through hole 230b by 90 degrees due to the structure forming the recess 230c shown in FIGS. This prevents the hook 211c from slipping outward in the vehicle width direction from the through hole 230b. The retainer 230 is an example of the base member, and the bottom wall 230a provided with the recess 230c is an example of the support portion and an example of the retaining structure.

A bottom wall 251b1 of the cup 251b is provided with a concave portion 251b4 that accommodates a convex portion 230e that protrudes on the opposite side of the concave portion 230c of the retainer 230. As shown in FIG. The recessed portion 251b4 is recessed outward in the vehicle width direction, and the shape of the cross section perpendicular to the central axis Ax of the recessed portion 251b4 is an oval or rectangular shape that accommodates the convex portion 230e having an oval or rectangular cross section. It has a rectangular shape. When the protrusion 230e is accommodated, the bottom wall 251b1 forming the recess 251b4 limits the rotation of the protrusion 230e and thus the retainer 230 around the central axis Ax.

A peripheral edge portion 251b5 of the opening of the cup 251b is located radially outside the peripheral edge portion of the retainer 230 and is aligned with the peripheral edge portion of the retainer 230, in other words, flush with the peripheral edge portion.

As shown in FIGS. 6-9, the cover 252 has a disk-like shape. A peripheral edge portion 252a of the cover 252 is joined to a peripheral edge portion 251b5 of the cup 251b. Cup 251 b and cover 252 entirely cover retainer 230 .

A peripheral portion 252a of the cover 252 is provided with a plurality of notches 252b. As shown in FIG. 6, the cutouts 252b are provided at predetermined intervals around the peripheral portion 252a, for example, at regular intervals (90° intervals) around the central axis Ax. As shown in FIGS. 8 and 9, the notch 252b extends radially inwardly from the outer periphery of the peripheral edge portion 252a and axially penetrates the cover 252. As shown in FIGS. The notch 252b connects the outside and the inside of the cover 252 . In the attached state of the holding member 250, the notch 252b functions as a drain hole and an air vent hole.

As shown in FIG. 5, the spring retainer 230A is provided with a through hole 230g through which the hook 211c of the pin 211 passes but the flange 211b does not pass. As shown in FIG. 5 , the peripheral edge of spring retainer 230A supports the peripheral edge of coil spring 220 .

Referring to FIG. 5, the assembling operation of the support mechanism 200A will be described. First, the worker attaches the holding member 250 to the through-hole 12c of the backing plate 12, and further, with the shoe web 11a arranged, the pin 211, the spring retainer 230A, and the coil spring 220 are brought close to the backing plate 12 and the shoe web 11a in the direction I2 from the outside in the vehicle width direction.

Next, the operator presses the spring retainer 230A inward in the vehicle width direction, thereby elastically compressing the coil spring 220 in the vehicle width direction between the shoe web 11a and the hook 211c of the holding member 250. It is inserted into the opening 251e. Finally, when the hook 211c passes through the through hole 230b of the retainer 230, the operator rotates the pin 211 by 90° around the central axis Ax to release the pressing force inward in the vehicle width direction. is accommodated in the recess 230c. Thereby, the support mechanism 200A is attached to the backing plate 12 .

As described above, in the present embodiment, the holding member 250 (second support member) detachably supports the leg portion 251a (mounting portion) attached to the backing plate 12 and the hook 211c (pin 211). and a bottom wall 230a (retaining structure) of the retainer 230 provided with a concave portion 230c for accommodating the hook 211c. According to such a configuration, for example, the pin 211 (first support member) can be attached to the backing plate 12 via the holding member 250 attached to the backing plate 12, and the pin can be attached to the backing plate as in the conventional configuration. Since there is no need to support from both sides of the pin 211 (first support member), attachment and detachment of the pin 211 (first support member) can be performed more easily or more quickly.

Also in this embodiment, the holding member 250 , at least a part of which is an elastic body, supports the pin 211 so as to swing with respect to the backing plate 12 . Therefore, according to the present embodiment, for example, the brake shoe 11 is prevented from becoming difficult to move due to the pin 211 , such as the brake shoe 11 being caught by the pin 211 .

In addition, in this embodiment, the holding member 250 has a retainer 230 (base member) that supports the hook 211c and prevents the hook 211c from coming off, a body 251 and a cover 252 (elastic body). there is According to such a configuration, for example, in the holding member 250, a member (the body 251 and the cover 252) that pivotally supports the pin 211 and a member (the body 251 and the cover 252) that detachably support the pin 211 and prevent the pin 211 from falling out are provided. Since the member (retainer 230) that holds the member (retainer 230) can be separated, each function can be achieved more reliably or with higher accuracy.

Further, in this embodiment, the holding member 250 is attached to the edge of the through hole 12c (opening) of the backing plate 12, is inserted into the through hole 12c, and covers the through hole 12c. According to such a configuration, the holding member 250 can prevent water from entering the drum brake through the through hole 12c.

[Modification of Second Embodiment]
FIG. 10 is a cross-sectional view of a holding member 250A of a modified example at the same position as in FIG. In this modification, body 251A entirely covers retainer 230 . A cover 251g which is integrated with the body 251A and which is a part of the body 251A is in contact with the retainer 230 . However, when the hook 211c of the pin 211 is inserted into the opening 251e from the outside in the vehicle width direction in the direction I2, the cover 251g is pushed by the hook 211c and separated from the retainer 230 in the direction I2. and the cover 251g, a space for accommodating the hook 211c is formed. The holding member 250A is an example of a second support member, and the body 251A and the cover 251g are examples of elastic bodies.

Even with such a configuration, the same effects as those of the second embodiment can be obtained. Further, according to this modification, for example, the number of parts of the holding member 250A (second support member) can be further reduced, and the labor and cost of manufacturing can be further reduced. Furthermore, according to this modified example, for example, it is possible to more reliably prevent water from entering the drum brake through the through hole 12c.

Although the embodiment of the present invention has been illustrated above, the above embodiment is an example and is not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, replacements, combinations, and modifications can be made without departing from the scope of the invention. In addition, specifications such as each configuration and shape (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) may be changed as appropriate. can be implemented.

For example, in the above embodiment, the vehicle brake has an electric actuator, but the present invention can also be applied to a vehicle brake that does not have an electric actuator.

Reference Signs List 10, 10A Brake device (vehicle brake) 11 Brake shoe (braking member) 12 Backing plate 12a Outer surface (first surface) 12c Through hole (opening, edge) 100 Electric actuator 210... Pin assembly (assembly), 211... Pin (first support member), 212... Holding member (elastic body, second support member), 220... Coil spring (biasing member), 230... Retainer (second embodiment) base member), 230a... Bottom wall (supporting part, retaining structure), 240, 240A... Snap fit mechanism, 250, 250A... Holding member (second supporting member), 251, 251A... Body (elastic body), 251a . . . Leg portion (mounting portion), 252, 251g .. Cover (elastic body), C .

Claims (6)

a backing plate having a first surface facing in a first direction parallel to the center of rotation of the wheel;
a braking member movably provided along the first surface for braking the wheel;
a first support member provided in a state of protruding from the first surface in the first direction;
a biasing member supported by the first support member and biasing the braking member toward the first surface;
a second support member having an elastic body attached to the backing plate and rockably supporting the first support member;
with
The elastic body is flexurally deformable in a radial direction intersecting the first direction in order to detachably support the first support member with respect to the backing plate and prevent it from coming off in the opposite side of the first direction. A vehicular brake that has a portion, and is prevented from slipping off by contacting the first surface in a state where the portion opens outward in the radial direction . an integrated assembly of the first support member and the second support member;
2. The vehicle brake according to claim 1, wherein said second support member has a snap-fit mechanism attached to said backing plate. The second support member includes a mounting portion that is mounted on the backing plate, a support portion that detachably supports the first support member, and a support portion that prevents the first support member from coming off. 2. The vehicle brake according to claim 1, further comprising a retaining structure. 4. The vehicle brake according to claim 3, wherein said second support member has a base member integrated with said elastic body and having said support portion and said retaining structure. The backing plate is provided with an opening,
5. Any one of claims 1 to 4, wherein the second support member is attached to the edge of the opening while at least partially covering the opening or being at least partially inserted into the opening. Vehicle brakes according to one. 6. A vehicle brake according to claim 5, further comprising an electric actuator positioned opposite said braking member with respect to said opening for actuating said braking member.

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