JP4750006B2 - Drum brake actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operating system whose productivity of assembling work can be improved in the operating system of a brake drum. <P>SOLUTION: The operating system of the brake drum is equipped with a lever 20, a case 30 and a leaf spring 60. The lever 20 can move between a mounting work position where an insertion hole 20b of the lever 20 is exposed from the case 30 and a usage position where at least part of the insertion hole 20b is enclosed by the case 30. The leaf spring 60 is arranged so as to interfere with the lever 20 in a mid-course position between the mounting work position and the usage position. The case 30 is formed with a coupling plate 30e which regulates elastic deformation of the leaf spring 60 when the lever 20 moving from the usage position to the mounting work position has interfered with the leaf spring 60. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a drum brake operating device that operates a drum brake by being pulled by a pulling member such as a brake cable.

  In the mechanical drum brake, generally, an operation device that operates a brake by pushing and expanding a brake shoe disposed in the brake drum is used. Some mechanical drum brake operating devices include a lever to which a brake cable is attached by a connecting pin, and a housing member that rotatably supports the lever and houses the lever. When the brake cable pulls the lever, the lever presses the brake shoe with which the lever is engaged, and the housing member presses the brake shoe with which the housing member is engaged. The housing member also surrounds an insertion hole provided in the lever for inserting the connecting pin, thereby preventing the connecting pin from falling off the lever and preventing the brake cable from being detached from the drum brake. ing.

  When attaching the brake cable, in order to insert the connecting pin into the insertion hole of the lever, it is necessary to expose the entire insertion hole from the housing member. Patent Document 1 proposes an operating device that causes a lever to interfere with a leaf spring-like clip and holds the lever at a position where the entire insertion hole is exposed from the housing member (hereinafter referred to as an attachment work position).

Further, in this operating device, after the brake cable is attached to the lever by the connecting pin, the clip is elastically deformed, and the lever is moved from the attachment work position to a position where at least a part of the insertion hole is surrounded by the housing member (hereinafter, It is allowed to rotate to the use position. And the clip is suppressing that a lever returns to an attachment operation position once a lever rotates to a use position. Thus, for example, in the process of assembling the drum brake to the vehicle body, when the drum brake is transported with one end of the brake cable attached to the lever and the other end being a free end, the connecting pin is dropped. It is to be prevented.
JP 2004-108458 A

  However, the actuator disclosed in Patent Document 1 may not be reliable in the workability of the assembly work. The clip bends easily depending on the direction of rotation of the lever, but if the rigidity of the clip is low, once the lever has been rotated to the use position, the clip is elastically deformed (flexed), and the lever is attached. It will return to a position and the connection pin may fall off.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an operating device capable of improving workability of assembly work in an operating device of a drum brake.

  In order to solve the above-described problem, the drum brake operating device according to the present invention is a drum brake operating device that pushes and spreads the brake shoe to operate the brake, and has a mounted portion to which the traction member is attached. The traction member is provided so as to be movable between an attachment work position arranged for attaching the traction member to the attached portion and a use position arranged when the drum brake is used, and is braked by being pulled by the traction member. A lever that presses a shoe; and a housing member that houses the lever, exposes the mounted portion of the lever in the mounting work position, and surrounds at least a part of the mounted portion of the lever in the use position And an elastic member that interferes with the lever at a position between the attachment work position and the use position, and the housing member is removed from the use position. When the lever moves in a direction toward the working position interferes with the elastic member, having an elastic deformation restricting portion for restricting the elastic deformation of the elastic member.

  According to the present invention, it is possible to hold the lever at the installation work position during the installation work of the brake cable, and reliably prevent the lever from returning from the use position to the installation work position after the installation, thereby improving workability.

  In one aspect of the present invention, the lever includes a fulcrum portion that serves as a fulcrum when the traction member is pulled, and an interference portion that interferes with the elastic member, and the interference portion is more than the fulcrum portion than the attached portion. Provided on the side. According to this aspect, even when the rigidity of the elastic member is increased, the lever can be moved from the installation work position to the use position without having an excessively strong operating force, and workability can be improved.

  In this aspect, the elastic member is a leaf spring, and is provided so as to extend from the attached portion side of the lever to the fulcrum portion side, and its end portion interferes with the interference portion of the lever. May be. In this way, since the end of the leaf spring can be configured to interfere with the lever at a position close to the fulcrum of the lever, the lever can be moved from the mounting work position to the use position with an appropriate operating force. Workability can be improved.

  Further, in this aspect, the elastic member includes a plate portion provided so as to be in contact with the elastic deformation restricting portion, a bent portion extending from the plate portion toward the lever side, and an end portion of the elastic member being the interference portion of the lever. And a base part of the extension part may be provided at a position in contact with the elastic deformation restricting part. In this way, the lever can be more reliably prevented from returning from the use position to the mounting work position.

  In the aspect of the invention, the elastic member is attached to the elastic deformation restricting portion. According to this aspect, the leaf spring can be attached to the elastic deformation restricting portion with a simple operation.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a mechanical drum brake 1 including an operating device 10 which is an example of an embodiment of the present invention. This figure mainly shows a portion where the actuating device 10 is provided in the drum brake 1. FIG. 2 is an exploded perspective view of the actuator 10, the brake cable (traction member) 50, and the connecting pin 52. 3 is a cross-sectional view taken along line iii-iii in FIG. 1, and FIG. 4 is a cross-sectional view taken along line iv-iv in FIG. As will be described later, the actuating device 10 includes a lever 20 and a case (accommodating member) 30 that accommodates the lever 20. In FIG. 3, a connecting pin 52 that connects the brake cable 50 and the lever 20 is provided. The lever 20 is disposed at a position where the entire insertion hole (attached portion) 20 b to be inserted is exposed from the case 30.

  FIG. 5 shows a state where the lever 20 is at the lower limit position in a state where the other end of the brake cable 50 attached to the lever 20 is a free end. FIG. 6 similarly shows a state where the lever 20 is at the upper limit position in a state where the other end of the brake cable 50 is a free end. In FIG. 5, the lever 20 and the case 30 are in contact with the brake shoes 2 and 3 as the lever 20 rotates downward. In FIG. 6, the lever 20 contacts the leaf spring (elastic member) 60 by rotating the lever 20 upward.

  The drum brake 1 shown in FIG. 1 is a parking brake that is used when the vehicle is parked in the example described here, and includes a pair of brake shoes 2 and 3 disposed inside the brake drum. The pair of brake shoes 2 and 3 are disposed on a back plate 7 that is fixedly attached to the vehicle body, and their end portions face each other with a space therebetween. Two shoe return springs are stretched between the brake shoe 2 and the brake shoe 3, and the brake shoes 2 and 3 are attracted to each other by the contraction force of these shoe return springs. In FIG. 1, only the shoe spring 4 on one side is shown.

  When the brake cable 50 is pulled, the brake shoes 2 and 3 are pushed and expanded in opposite directions against the contraction force of the two shoe springs by the actuator 10. As a result, the outer peripheral surfaces 2a and 3a of the brake shoes 2 and 3 are pressed against the inner wall surface 6 of the brake drum, respectively. Thereafter, for example, when the wheel tries to rotate due to the weight of the vehicle on a slope or the like, a frictional force is generated between the inner wall surface 6 and the outer peripheral surfaces 2a and 3a of the brake shoes 2 and 3, and the vehicle is braked. When the traction of the brake cable 50 is released, the brake shoes 2 and 3 are attracted by the contraction force of the shoe spring. As a result, the outer peripheral surfaces 2a and 3a of the brake shoes 2 and 3 are separated from the inner wall surface 6 of the brake drum again, and the braking force is released.

  As shown in FIG. 2, a connecting portion 51 for connecting the brake cable 50 to the lever 20 is provided at the tip of the brake cable 50. In the example described here, the connecting portion 51 is attached to the lever 20 by the connecting pin 52. Specifically, the connecting portion 51 includes a base portion 51c and a pair of plate portions 51a and 51a that rise from the base portion 51c and face each other. The plate portions 51a and 51a are provided with openings 51d and 51d. On the other hand, the lever 20 is provided with an insertion hole 20b at its end. The connecting portion 51 is attached to the lever 20 by inserting the connecting pin 52 into the insertion hole 20b and the openings 51d and 51d.

  The actuating device 10 is disposed between the brake shoes 2 and 3 above the seat portion 5b of the anchor 5 fixed to the back plate 7 and adjacent to the standing portion 5a (FIGS. 1 and 3). reference). As shown in FIG. 2, the operating device 10 includes a pin 40, a washer 41, and a leaf spring 60 in addition to the lever 20 and the case 30.

  The case 30 is formed in a pair of walls facing each other, and is arranged such that the longitudinal direction thereof faces the extension direction of the brake shoes 2 and 3 (the direction indicated by A in FIG. 3). The case 30 includes a pair of wall portions 30L and 30L that prevent the connecting pin 52 from dropping from the insertion hole 20b, a brake shoe contact portion 30a that contacts the brake shoe 3, and a pair of members that rotatably support the lever 20. It has lever support portions 30d and 30d and a connecting plate portion (elastic deformation restricting portion) 30e that spans the wall portions 30L and 30L.

  The lever 20 has a thick plate shape that is long in the extending direction of the brake shoes 2 and 3 and is disposed inside the case 30 (see FIG. 4). The lever 20 is formed with a brake shoe contact portion 20 c that contacts the brake shoe 2, an interference portion 20 f that interferes with the leaf spring 60, and a supported portion 20 e that is supported by the case 30.

  In the example described here, the opening 20 h is provided in the supported portion 20 e of the lever 20, and the openings 30 h and 30 h are provided in the lever supporting portions 30 d and 30 d of the case 30. And the pin 40 is inserted in these opening 20h, 30h, 30h. As a result, the lever 20 can rotate around the pin 40. The lever 20 has a position where the entire insertion hole 20b is exposed from the walls 30L and 30L (hereinafter referred to as an attachment work position; see FIG. 3), and at least a part of the insertion hole 20b is formed in the walls 30L and 30L. It is configured to be rotatable with respect to an enclosed position (hereinafter referred to as a use position, see FIGS. 5 and 6). The lever 20 to which the brake cable 50 is attached is located at a position where a brake shoe contact portion 20c of the lever 20 and a brake shoe contact portion 30a of a case 30 described later are in contact with the brake shoes 2 and 3, respectively (see FIG. The drum brake 1 is operated by further rotating from the position shown in FIG.

  The leaf spring 60 is disposed so as to interfere with the lever 20 that rotates between the attachment work position and the use position. In the present embodiment, the leaf spring 60 is elastically deformed to allow rotation of the lever 20 from the attachment work position to the use position. On the other hand, when the leaf spring 60 interferes with the lever 20 that rotates in the direction from the use position toward the attachment work position, the elastic deformation of the leaf spring 60 is restricted by the connecting plate portion 30 e of the case 30. Thereby, the rotation from the use position of the lever 20 toward the mounting work position is restricted. Hereinafter, the shapes of the lever 20, the case 30, and the leaf spring 60 will be described in detail.

  First, the lever 20 will be described.

  As shown in FIGS. 2 and 3, the brake shoe contact portion 20 c is formed on the brake shoe 2 side of the plate-like lever 20 and faces the end portion of the brake shoe 2. The brake shoe abutting portion 20c presses the brake shoe 2 in the expansion direction when the lever 20 is pulled by the brake cable 50 (see FIG. 5).

  The supported portion 20e is located at the end of the lever 20 on the brake shoe 2 side, and is formed so as to protrude to the brake shoe 2 side above the brake shoe contact portion 20c. A fulcrum portion 20d that is a fulcrum when the brake cable 50 is pulled is formed in the supported portion 20e. That is, in this example, as shown in FIG. 2, the supported portion 20e is provided with an opening 20h, and the inner wall of the opening 20h is a fulcrum portion 20d. When the pin 40 is inserted into the opening 20h, the fulcrum portion 20d that is the inner wall of the opening 20h contacts the outer peripheral surface of the pin 40, and the lever 20 pulled by the brake cable 50 rotates with the fulcrum portion 20d as a fulcrum. Further, the fulcrum portion 20d presses the case 30 to the brake shoe 3 side via the pin 40 when the brake cable 50 is pulled. A washer 41 that prevents the pin 40 from dropping off is attached to the end of the pin 40.

  The end portion of the lever 20 on the brake shoe 3 side is sandwiched between the plate portions 51a and 51a of the connecting portion 51, and a connecting pin 52 is inserted into an insertion hole (attached portion) 20b and openings 51d and 51d provided in the end portion. Plugged in. As a result, the brake cable 50 pulls the end of the lever 20 on the brake lever 3 side via the connecting pin 52.

  The interference portion 20f is formed so as to engage with the end portion 60g of the leaf spring 60 when the lever 20 is in the mounting operation position (see FIG. 3). In this example, as shown in FIG. 2, the interference part 20f is formed in the upper wall 20i of the lever 20, and is located on the fulcrum part 20d side from the insertion hole (attached part) 20b. Moreover, the interference part 20f is formed in a bowl shape slightly curved toward the end part 60g side of the leaf spring 60 (see FIG. 3).

  The lever 20 has a protruding portion 20t that extends from the brake shoe contact portion 20c toward the brake shoe 2 below the brake shoe contact portion 20c. The end portion of the brake shoe 2 is located between the protruding portion 20t and the supported portion 20e, and the protruding portion 20t prevents the positional relationship between the actuating device 10 and the brake shoe 2 from shifting vertically together with the supported portion 20e. is doing.

  Next, the case 30 will be described.

  The lever support portions 30 d and 30 d are formed at the end of the case 30 on the brake shoe 2 side, and have fulcrum support portions 30 i and 30 i that support the fulcrum portion 20 d of the lever 20. That is, in this example, as shown in FIG. 2, the lever support portions 30d and 30d are provided with openings 30h and 30h, and the inner walls of the openings 30h and 30h serve as fulcrum support portions 30i and 30i. The fulcrum support portions 30 i and 30 i support the fulcrum portion 20 d via the pins 40 inserted into the openings 30 h and 30 h and the opening 20 h of the lever 20.

  The pair of wall portions 30L, 30L are formed so as to connect the lever support portions 30d, 30d and the brake shoe contact portion 30a located on the brake shoe 3 side. As shown in FIG. 4, these wall portions 30 </ b> L and 30 </ b> L are formed to face each other, and the lever 20 and the connecting portion 51 are disposed therebetween. Further, the interval between the wall portions 30L and 30L is set to be slightly wider than the length of the connecting pin 52 so that it does not fall off from the lever 20 even when the connecting pin 52 moves until it abuts against one wall surface 30L. . As shown in FIG. 3, the height of the pair of wall portions 30L, 30L is set so that the entire insertion hole 20b is exposed when the interference portion 20f of the lever 20 is engaged with the leaf spring 60. Has been. Further, as shown in FIGS. 5 and 6, this height is set so as to surround the insertion hole 20 b of the lever 20 that rotates in the range of the use position from the side. As a result, the walls 30L and 30L are used when the drum brake 1 is actuated or when the drum brake 1 is transported with the other end of the brake cable 50 attached to the lever 20 being a free end. 50 prevents the lever 20 from detaching.

  As shown in FIG. 2, the brake shoe 3 side of the pair of wall portions 30L, 30L is joined, thereby forming an overlapping portion 30u where the two wall portions overlap. And the brake shoe contact part 30a which opposes the brake shoe 3 is formed in the up-down direction intermediate part of the said superimposition part 30u. The brake shoe contact portion 30a contacts the brake shoe 3 when the lever 20 is pulled by the brake cable 50, and presses the brake shoe 3 in the extending direction (see FIG. 5).

  The overlapping portion 30u has a pair of upper and lower projecting portions 30b and 30c that project further from the brake shoe contacting portion 30a to the brake shoe 3 side above and below the brake shoe contacting portion 30a. The protrusions 30b and 30c prevent the positional relationship between the actuator 10 and the brake shoe 3 from shifting in the vertical direction.

  The connecting plate portion 30e is formed in a plate shape, and is provided between the brake shoe contact portion 30a and the lever support portions 30d and 30d. As a result, the pair of wall portions 30L, 30L are prevented from opening and the entire case 30 is prevented from being deformed. In this example, the connecting plate portion 30e is positioned above the lever 20 disposed inside the wall portions 30L and 30L, and is connected to the wall portions 30L and 30L so as to connect the upper edge portions of the wall portions 30L and 30L. It is being handed over. Convex portions 30f and 30f projecting upward are formed on the upper wall of the connecting plate portion 30e. The convex portions 30f and 30f are formed at positions corresponding to openings 60b and 60b formed in the leaf spring 60 described later, and restrict the movement of the leaf spring 60 by fitting into the openings 60b and 60b.

  Next, the leaf spring 60 will be described. FIG. 7 is a cross-sectional view of the actuator 10 centering on the leaf spring 60 and the connecting plate portion 30e. In the drawing, the lever 20 in the attachment work position is indicated by a two-dot chain line, and the lever 20 in the use position is indicated by a solid line. The leaf spring 60 that is elastically deformed by the rotation of the lever 20 is indicated by a two-dot chain line.

  The leaf spring 60 has a clip portion 60f that sandwiches the connecting plate portion 30e, and is attached to the connecting plate portion 30e by the clip portion 60f. That is, the plate spring 60 includes an upper plate portion 60d that contacts the upper surface of the connecting plate portion 30e, a lower plate portion 60c that faces the upper plate portion 60d and contacts the lower surface of the connecting plate portion 30e, and an end portion of the upper plate portion 60d. A folded portion 60e that connects the end of the lower plate portion 60c is provided. The upper plate portion 60d, the folded portion 60e, and the lower plate portion 60c constitute a clip portion 60f, and the upper plate portion 60d and the lower plate portion 60c sandwich the connecting plate portion 30e. The upper plate portion 60d is provided with openings 60b and 60b (see FIG. 2). The movement of the leaf spring 60 is restricted by fitting the protrusions 30f and 30f of the connecting plate portion 30e into the openings 60b and 60b.

  The leaf spring 60 extends from the insertion hole 20b side of the lever 20 to the fulcrum 20d side, and the end 60g thereof is arranged to interfere with the interference portion 20f of the lever 20. Specifically, the lower plate portion 60c extends in an extending direction from one end portion where the folded portions 60e are connected, and the other end portion is provided with an extending portion 60a provided at a position in contact with the connecting plate portion 30e as an elastic deformation restricting portion. The base portion 60i is continuous. The extending portion 60a is bent obliquely downward toward the interference portion 20f of the lever 20 at a bent portion 60h located near the base portion 60i. The end portion 60g of the extending portion 60a engages with the interference portion 20f of the lever 20 at the attachment work position (see FIGS. 3 and 7). Further, when the lever 20 is about to rotate from the use position where a part of the insertion hole 20b is surrounded by the walls 30L and 30L toward the mounting work position, the interference part 20f contacts the end 60g of the extending part 60a from below. (See FIGS. 6 and 7).

  Next, a method of attaching the brake cable 50 to the operating device 10 and an operation of the operating device 10 at the time of installation work will be described with reference to FIGS. 3, 5, and 7.

  When the brake cable 50 is attached, first, the lever 20 supported so as to be rotatable with respect to the case 30 is rotated upward and disposed at the attachment work position, and the lever 20 at the attachment work position is held by the leaf spring 60. That is, the lever 20 is held in a state where the entire insertion hole 20b of the lever 20 is exposed from the wall portions 30L and 30L of the case 30. Then, the leaf spring 60 is slid in the expansion direction with the connecting plate portion 30e being sandwiched until the convex portions 30f, 30f of the connecting plate portion 30e fit into the openings 60b, 60b. As a result, the end portion 60g of the leaf spring 60 engages with the interference portion 20f of the lever 20, and holds the lever 20 in the mounting work position (see FIG. 3).

  Thereafter, the connecting portion 51 of the brake cable 50 is inserted into the case 30 from below, and the connecting pin 52 is inserted into the openings 51 d and 51 d of the connecting portion 51 and the insertion hole 20 b of the lever 20. As a result, the brake cable 50 is attached to the lever 20.

  Thereafter, when the lever 20 is pulled by the brake cable 50, for example, and rotated from the mounting operation position to the use position, the leaf spring 60 is elastically deformed to allow the lever 20 to rotate. That is, as indicated by a two-dot chain line in FIG. 7, the lower plate portion 60c of the leaf spring 60 is tilted starting from the folded portion 60e. When the lever 20 further rotates, the engagement between the lever 20 and the leaf spring 60 is released (see FIG. 5). At this time, the leaf spring 60 is restored by its elastic force, and the lower plate portion 60c and the upper plate portion 60d grip the connecting plate portion 30e again.

  Once the lever 20 is rotated to the use position, when it is going to rotate in the direction from the use position to the mounting work position, the elastic deformation of the leaf spring 60 is restricted by the connecting plate part 30e as an elastic deformation restricting part. That is, as shown in FIG. 7, the interference portion 20f comes into contact with the end portion 60g of the extending portion 60a from below and tries to push up the lower plate portion 60c, but the connecting plate portion 30e is connected to the lower plate portion 60c and the extending portion. The upward tilting of the base 60i of 60a is restricted. At this time, the lever 20 receives a reaction force in the direction in which the extending portion 60a extends from the extending portion 60a, and its rotation is restricted. Therefore, the lever 20 does not return to the mounting work position again. For example, when the drum brake 1 is transported with the other end of the brake cable 50 being a free end, the connecting pin 52 is prevented from falling off. The

  After the brake cable 50 is attached to the lever 20 and the brake cable 50 is pulled, the interference portion 20f of the lever 20 gets over the end portion 60g of the leaf spring 60, so that the brake cable 50 and the brake shoe 2 are used. The lever 20 whose movement is not constrained can be freely rotated only within the range of the use position. That is, the lever 20 rotates from a position where the insertion hole 20b is at the upper limit position (position shown in FIG. 6) to a position where the insertion hole 20b is at the lower limit position (position shown in FIG. 5).

  Note that the method of attaching the brake cable 50 is not limited to the method described above. For example, in the method described above, after the lever 20 supported so as to be rotatable with respect to the case 30 is disposed at the attachment work position, the leaf spring 60 is attached to the connecting plate portion 30e, and the lever 20 is held at the attachment work position. It was like that. However, for example, the leaf spring 60 may be first attached to the connecting plate portion 30e of the case 30, and then the pin 40 may be inserted while holding the lever 20 in the attachment work position.

  In the operating device 10 described above, the leaf spring 60 is attached to the connecting plate portion 30e, and the leaf spring 60 is disposed so as to interfere with the lever 20 that moves between the attachment work position and the use position. When the lever 20 is about to move from the use position to the attachment work position, the elastic deformation of the leaf spring 60 is restricted by the connecting plate part 30e as an elastic deformation restricting part. Therefore, the lever can be securely held at the installation work position during the installation work of the brake cable 50, and after the installation, the lever can be prevented from returning from the use position to the installation work position, and workability can be improved.

It is a top view of the mechanical drum brake provided with the actuator which is an example of one embodiment of the present invention. It is a disassembled perspective view of the said actuator, a brake cable, and a connection pin. It is sectional drawing of the said operating device, and has shown the state which the insertion hole of a lever is exposed from the case. It is the iv-iv sectional view taken on the line of FIG. It is sectional drawing of the said operating device, and the mode that a lever exists in a lower limit position in the state in which the other end of the brake cable attached to the lever is a free end is shown. In this figure, the lever rotates and the lever and the case are in contact with the brake shoe. It is sectional drawing of the said operating device, and the mode that a lever exists in an upper limit position in the state in which the other end of a brake cable is a free end is shown. In this figure, the lever rotates and the lever contacts the leaf spring (elastic member). It is sectional drawing of the actuator which shows a leaf | plate spring and the connection board part of a case centering.

Explanation of symbols

  1 drum brake, 2, 3 brake shoe, 4 shoe return spring, 5 anchor, 10 actuator, 20 lever, 20b insertion hole (attached part), 20d fulcrum part, 20f interference part, 30 case (accommodating member), 30e Connecting plate portion (elastic deformation regulating portion), 50 brake cable (traction member), 60 leaf spring (elastic member), 60d upper plate portion, 60c lower plate portion, 60a extending portion, 60f clip portion.

Claims (4)

An actuating device for a drum brake that pushes a brake shoe and activates the brake;
An accommodating member having a pair of wall portions and a connecting plate portion spanned between the pair of wall portions;
A lever that is disposed between the pair of wall portions and has a mounted portion to which a traction member is attached , wherein the attached portion is attached to the pair of the traction member for the attachment work to the mounted portion. move between and arranged Ru mounting work position so as to be exposed from the wall portion, and said at least partially located between said pair of walls use position arranged in use the drum brake of the attached portion of the A lever provided so as to be pulled by the pulling member and press the brake shoe;
The base plate includes a first plate portion and a second plate portion that are connected to each other, and the first plate portion and the second plate portion sandwich both surfaces of the connection plate portion, An elastic member attached to the connecting plate part,
The first plate portion is elastically deformable starting from the base end portion, and the tilt of the first plate portion in a direction away from the connection plate portion is allowed, and the tilt in the opposite direction is the connection plate. Regulated by the Department,
The distal end side of the first plate portion is provided at a position that interferes with the lever that moves between the attachment work position and the use position,
In the process in which the lever moves from the attachment work position toward the use position, the lever comes into contact with the tip portion in a direction separating the first plate portion from the connection plate portion, and the lever is moved from the use position to the use position. In the process of moving toward the mounting work position, it hits the opposite direction with respect to the tip.
An actuating device for a drum brake. The actuating device for a drum brake according to claim 1,
The lever has a fulcrum portion that becomes a fulcrum when towing by the towing member, and an interference portion that interferes with the elastic member,
The interference part is provided on the fulcrum part side from the attached part,
An actuating device for a drum brake. The actuating device for a drum brake according to claim 2,
The first plate portion of the elastic member is provided so as to extend from the attached portion side of the lever to the fulcrum portion side, and an end portion thereof interferes with the interference portion of the lever.
An actuating device for a drum brake. The actuating device for a drum brake according to claim 3,
The elastic member has an extending portion that bends and extends from the first plate portion toward the lever side on the distal end side of the first plate portion , and an end portion of which is in contact with the interference portion of the lever. Have
The base of the extending portion is provided at a position in contact with the connecting plate portion.
An actuating device for a drum brake.

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