CN110520646B - Spring moving tool - Google Patents
Spring moving tool Download PDFInfo
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- CN110520646B CN110520646B CN201880025193.2A CN201880025193A CN110520646B CN 110520646 B CN110520646 B CN 110520646B CN 201880025193 A CN201880025193 A CN 201880025193A CN 110520646 B CN110520646 B CN 110520646B
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- spring
- link
- drum brake
- intermediate region
- rebound
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
Spring-actuated tool (30) comprising: a first link (31), and a second link (32) rotatably connected to the first link (31) via a connection section (34). The first link (31) has a spring support portion (36), and the second link (32) has a locking end portion (32 b). The locking end portion (32b) is formed so as to be lockable to the upper end portion (20) of the outer plate portion (12) of the shoe web (6 b). When the connecting portion (34) is moved upward in the second direction centered on the contact portion between the locking end portion (32b) and the shoe web (6b) from an initial state in which the spring moving tool (30) is provided in the drum brake (1), the spring support portion (36) moves upward in the second direction in accordance with the movement of the connecting portion (34), and deforms the intermediate region (4a) of the rebound spring (4) upward in the second direction, thereby bringing the rebound spring (4) into a non-interfering state.
Description
Technical Field
The present disclosure relates to spring-powered travel tools.
Background
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent application publication No. 2006-242238
Disclosure of Invention
[ problem to be solved by the invention ]
In the case where the rebound spring and the bolt insertion hole (bolt insertion hole) of the anchor bracket are arranged to overlap each other as in the drum brake described in patent document 1, a tightening tool for tightening the bolt inserted through the bolt insertion hole of the anchor bracket interferes with the rebound spring when the drum brake is fixed to the vehicle body side. If the drum brake is fastened by the tightening tool from the rear side thereof in order to avoid interference between the tightening tool and the rebound spring, the space on the rear side of the drum brake is narrow, and therefore the fastening operation may become complicated. Further, if the fastening work is performed with the rebound spring removed from the drum brake, the rebound spring needs to be attached after the fastening work, and therefore, the work process of the attachment work of attaching the drum brake to the vehicle body side increases.
Therefore, an object of the present disclosure is to provide a spring moving tool capable of bringing a rebound spring into a non-interfering state in which the rebound spring does not interfere with a fastening tool at the time of fastening work of a bolt of a drum brake.
[ means for solving the problems ]
In order to solve the above-described problems, a first aspect of the present disclosure is a spring moving tool for deforming an intermediate region between both end portions of a resilient spring to one side in a second direction intersecting a first direction, the spring moving tool including a first link and a second link, in order to bring a fastening tool for fastening a bolt inserted into a bolt insertion hole and the resilient spring into an interference state in which the fastening tool and the resilient spring do not interfere with each other, when a drum brake having the anchor bracket formed with the bolt insertion hole, the pair of shoe webs arranged on both sides of the bolt insertion hole and movably supported by the anchor bracket, and the resilient spring having both end portions connected to the pair of shoe webs and extending in the first direction in the vicinity of the bolt insertion hole between the pair of shoe webs is fixed to a vehicle body side. The first link has a spring support portion on one end side capable of supporting an intermediate region of the rebound spring from the other side in the second direction. The second link has a locking portion on one end side that can be locked to a predetermined locked portion of the drum brake disposed on one side in the second direction in the intermediate region of the rebound spring, and the other end side is rotatably connected to the other end side of the first link about a rotation shaft extending in the first direction.
When the coupling portion including the rotation shafts of the first link and the second link is moved to one side in the second direction about the engagement portion of the second link from the initial state in which the spring support portion of the first link comes into contact with the intermediate region of the rebound spring in the interference state from the other side in the second direction and the engagement portion of the second link is engaged with the engaged portion of the drum brake, the spring support portion of the first link moves to one side in the second direction along with the movement of the coupling portion and the intermediate region of the rebound spring is deformed to one side in the second direction to bring the rebound spring into the non-interference state.
In the above configuration, when the rebound spring in the interfering state is set to the non-interfering state, first, the spring support portion of the first link is brought into contact with the intermediate region of the rebound spring from the other side in the second direction, and the engagement portion of the second link is engaged with the engaged portion of the drum brake. Then, the coupling portion of the first link and the second link is moved to one side in the second direction about the locking portion of the second link. As a result, the spring support portion of the first link moves to one side in the second direction in accordance with the movement of the coupling portion, and the intermediate region of the return spring is deformed to one side in the second direction, so that the return spring is in a non-interfering state. Therefore, when the drum brake is fixed to the vehicle body side, interference between the fastening tool and the rebound spring can be prevented during fastening work for inserting the bolt into the bolt insertion hole of the anchor bracket and fastening the bolt, and workability can be improved.
The spring support portion of the first link deforms the intermediate region of the rebound spring toward one side in the second direction in a state where the spring support portion abuts against the intermediate region of the rebound spring in the interference state from the other side in the second direction. In this way, the spring support portion is brought into contact with the intermediate region of the return spring from the other side in the second direction and the spring support portion is moved to the one side in the second direction, whereby the intermediate region of the return spring is deformed to the one side in the second direction.
A second aspect of the present disclosure is the spring moving tool according to the first aspect, wherein a linear distance between the spring support portion of the first link and the rotary shaft, that is, a first link distance is longer than a linear distance between the intermediate region of the rebound spring in the interference state and the engaged portion, that is, an engaged portion spring distance, in the second direction. The linear distance between the locking part of the second link and the rotating shaft, namely the second link distance, is longer than the difference between the first link distance and the distance between the springs of the locked part. The coupling portion in the initial state is disposed on the one side in the second direction with respect to the engaged portion. When the connecting portion in the initial state is moved to one side in the second direction around the locking portion of the second link, the connecting portion is moved in a direction approaching the anchor bracket.
In the above configuration, when the rebound spring in the interfering state is set to the non-interfering state, the rebound spring is first set to the initial state, and then the coupling portion between the first link and the second link is moved in a direction approaching the anchor bracket about the engaging portion of the second link.
The linear distance between the spring support portion of the first link and the rotary shaft, that is, the first link distance, is longer than the linear distance along the second direction between the middle region of the rebound spring in the interference state and the engaged portion, that is, the engaged portion inter-spring distance, and the linear distance between the engaging portion of the second link and the rotary shaft, that is, the second link distance, is longer than the difference between the first link distance and the engaged portion inter-spring distance. In the initial state, the coupling portion of the first link and the second link is disposed on one side in the second direction with respect to the engaged portion. In this way, the intermediate region of the rebound spring is deformed by the toggle mechanism having at least two links (the first link and the second link) and the one-point sliding movement portion (the spring support portion of the first link), and therefore the rebound spring can be brought from the interfering state to the non-interfering state with a relatively small force.
A third aspect of the present disclosure is the spring moving tool of the second aspect, wherein a region between the spring support portion and the rotary shaft in the first link is formed in a shape that allows the coupling portion to move toward the anchor bracket side than a virtual straight line connecting an intermediate region of the resilient spring in an interfering state when viewed from the first direction and the engaged portion.
In the above configuration, the region between the spring support portion and the rotary shaft in the first link allows the coupling portion to move toward the anchor bracket side than a virtual straight line connecting the intermediate region of the resilient spring in the interference state when viewed from the first direction and the engaged portion. When the connecting portion crosses the virtual straight line toward the anchor bracket, the restoring force of the resilient spring acts to move the connecting portion toward the anchor bracket about the engaging portion of the second link, so that the resilient spring can be maintained in a non-interfering state by the restoring force of the resilient spring.
A fourth aspect of the present disclosure is the spring moving tool of the first aspect, wherein the coupling portion is movable to a third direction side beyond a virtual straight line on the one side in the second direction with respect to the virtual straight line connecting the intermediate region of the rebound spring in the interfering state and the engaged portion of the drum brake as viewed from the first direction, the third direction being a direction intersecting both the first direction and the second direction.
A fifth aspect of the present disclosure is the spring moving tool of the fourth aspect, wherein the coupling portion is formed at a position closer to the spring than the spring moving tool
When an abutting portion between the locking portion of the second link and the engaged portion of the drum brake further extends to the one side in the second direction than the virtual straight line toward the one side in the third direction, the abutting portion acts by a restoring force of the resilient spring to move the coupling portion to the one side in the third direction and the other side in the second direction around the abutting portion between the locking portion of the second link and the engaged portion of the drum brake, thereby holding the resilient spring in the non-interfering state.
In the above-described configuration, when the connecting portion exceeds the virtual straight line on one side in the third direction, the restoring force of the resilient spring acts so that the connecting portion moves to one side in the third direction and the other side in the second direction centering on the abutting portion between the engaging portion of the second link and the engaged portion of the drum brake, and therefore the resilient spring can be held in a non-interfering state by the restoring force of the resilient spring.
[ Effect of the invention ]
According to the present disclosure, the rebound spring can be brought into a non-interfering state in which the rebound spring does not interfere with the fastening tool during the fastening operation of the bolt of the drum brake.
Drawings
Fig. 1 is a front view of a drum brake.
FIG. 2 is a sectional view taken along line II-II of FIG. 1.
Fig. 3 is a perspective view of a spring-powered shifting tool according to an embodiment of the present disclosure.
Fig. 4 is an enlarged view of a main portion of the drum brake of fig. 1.
Fig. 5A is an explanatory view of the movement of the rebound spring, showing a state before the movement.
Fig. 5B is an explanatory view of the movement of the rebound spring, and each of the states after the movement is shown.
Fig. 6 is an explanatory view of the fastening operation of the bolt.
Detailed Description
An embodiment of the present disclosure is described below with reference to the drawings. IN each drawing, FR denotes the front of the vehicle, UP denotes the upper side, IN denotes the inside IN the vehicle width direction, and IN fig. 3, a one-dot chain line CL denotes the center axis (rotation axis) of the shaft rod of the spring moving tool. In fig. 5A, 5B, and 6, hatching of the spring moving tool is omitted for ease of understanding.
The spring moving tool 30 of the present embodiment is a tool for preventing interference between the fastening tool 17 and the rebound spring 4 of the drum brake 1 when the drum brake 1 is fastened and fixed to the vehicle body (not shown) side using the fastening tool 17.
As shown in fig. 1 and 2, the drum brake 1 has an anchor bracket 2, a pair of shoe webs 6a, 6b, and a rebound spring 4. In the following description, the direction relating to the drum brake 1 indicates the direction in a state where the drum brake 1 is fixed to the vehicle body side.
The anchor bracket 2 is formed in a substantially circular shape in side view, and has an axle insertion hole 7 in a central portion thereof through which an axle (not shown) extending in the vehicle width direction is inserted. A plurality of (8 in the present embodiment) bolt insertion holes 3 are formed around the axle insertion hole 7 of the anchor bracket 2. The drum brake 1 is fixed to a non-rotating portion 22 (see fig. 6) on the vehicle body side by inserting a bolt 5 (see fig. 6) through the bolt insertion hole 3 and fastening the bolt 5. An anchor 8 is fixed to a lower end portion of one side surface (in the present embodiment, the outer side surface in the vehicle width direction) of the anchor bracket 2, and an S-cam 9 is rotatably attached to an upper end portion thereof. The anchor 8 and the S-cam 9 are disposed at positions that are radially outward of the anchor bracket 2 with respect to the bolt insertion hole 3 and vertically sandwich the axle insertion hole 7. The anchor 8 has a pair of anchor pins 11.
The pair of shoe webs 6a and 6b each have a pair of plate portions (outer plate portion 12 and inner plate portion 13) facing each other in the vehicle width direction, are formed into a substantially semicircular shape in a side view of the vehicle, are arranged at positions spaced apart forward and rearward on the vehicle width direction outer side of the anchor bracket 2 across the axle insertion hole 7, and extend vertically in the circumferential direction. The shoe webs 6a and 6b are rotatably supported at their lower ends by the anchor bracket 2 via anchor pins 11 of the anchor 8, and at their upper ends by the S-cam 9. Brake shoes 14 are fixed to the outer sides of the shoe webs 6a, 6b in the radial direction, and the shoe webs 6a, 6b support the brake shoes 14. A rebound spring 4 for biasing the shoe webs 6a and 6b in a direction to approach each other is bridged on the upper end sides of the shoe webs 6a and 6b, and an anchor spring 15 is bridged on the lower end sides of the shoe webs 6a and 6 b. When the brake is operated, the S-cam 9 rotates, the upper end sides of the shoe webs 6a and 6b tilt in directions away from each other about the anchor pin 11 as a rotation axis against the biasing force of the rebound spring 4, and the brake shoe 14 moves radially outward by the tilting and comes into contact with the wheel (not shown) side to generate a braking force. While the brake operation is not being performed, the shoe webs 6a and 6b are biased in a direction to approach each other by the rebound spring 4, and the brake shoe 14 is held in a state of being separated from the wheel side.
The rebound spring 4 is a coil spring disposed on the vehicle width direction outer side of the anchor bracket 2 and extending in the front-rear direction (first direction) in the vicinity of the bolt insertion hole 3 (the bolt insertion holes 3a, 3b in fig. 1) between the shoe webs 6a, 6 b. Both front and rear end portions of the rebound spring 4 are connected to upper end portions of the shoe webs 6a, 6b via pins 16a, 16b provided at the upper end portions of the shoe webs 6a, 6 b. The pins 16a, 16b extend in the vehicle width direction between the outer plate portions 12 and the inner plate portions 13 at the upper end portions of the shoe webs 6a, 6b, respectively. A region 4a (hereinafter, referred to as a middle region 4a) between the front and rear end portions of the rebound spring 4 integrally includes: a pair of coil sections 18a, 18b formed in a coil shape and extending in the front-rear direction; and a rod portion 19 linearly extending in the front-rear direction between the pair of coil portions 18a, 18b, the region 4a being overlapped with the bolt insertion hole 3a in the vehicle width direction and being disposed at a position adjacent to the bolt insertion hole 3b in a side view. When the drum brake 1 is fixed to the non-rotating portion 22 (see fig. 6) on the vehicle body side, the intermediate region 4a of the rebound spring 4 (in the present embodiment, the rod-shaped portion 19 in the intermediate region 4a) interferes with the fastening tool 17 (see fig. 6) at the time of fastening the bolt 5 (see fig. 6) inserted through the bolt insertion holes 3a, 3b (hereinafter, simply referred to as the fastening time of the bolt 5). That is, the rebound spring 4 of the drum brake 1 is in a state of interfering with the fastening tool 17 at the time of fastening the bolt 5 (hereinafter, referred to as an interference state).
As shown in fig. 4, 5A, and 5B, in the drum brake 1, the upper end portion 20 of the outer plate portion 12 of the shoe webs 6a, 6B is disposed at a position spaced apart from the intermediate region 4a of the rebound spring 4 to the upper side (one side) in the second direction (the direction indicated by the one-dot chain line 10 in fig. 5A and 5B) intersecting the front-rear direction (the first direction). In the present embodiment, of the shoe webs 6a and 6b, a locking end portion 32b of a spring moving tool 30 described later is locked to an upper end portion (a predetermined locked portion) 20 of the outer plate portion 12 of the rear shoe web 6 b. Fig. 4 shows a use position of the spring moving tool 30 when the drum brake 1 is used, by a two-dot chain line.
The spring moving tool 30 is a tool for bringing the rebound spring 4 and the fastening tool 17 into a non-interference state (hereinafter referred to as a non-interference state with reference to fig. 5B and 6) from an interference state in which the rebound spring 4 and the fastening tool 17 interfere with each other at the time of fastening the bolt 5, and includes, as shown in fig. 3, a first link 31 and a second link 32. The ends of the first link 31 and the second link 32 are rotatably connected to each other via a shaft rod 33 linearly extending in a predetermined direction around a rotation axis CL of the shaft rod 33. In the following description, the direction of the spring moving tool 30 refers to a direction in an initial state (hereinafter referred to as an initial state with reference to fig. 5 a) in which the spring moving tool 30 is provided in the drum brake 1 in order to change the rebound spring 4 from the interfering state to the non-interfering state.
As shown in fig. 3, 5A, and 5B, the first link 31 integrally includes a first arm portion 31a and a support plate portion 31B. The first arm portion 31a is a plate body intersecting the vehicle width direction, and extends downward from a connection portion 34 (including a rotation axis CL of the shaft rod 33) connected to the second link 32. The shaft rod 33 and the rotating shaft CL of the coupling portion 34 coupled to the second link 32 extend in the front-rear direction (first direction). The first arm portion 31a has a bent portion 35 extending in the front-rear direction at a predetermined height position between the upper end and the lower end thereof, and is formed in a mountain shape protruding outward in the vehicle width direction. The support plate portion 31b is a plate body intersecting the vertical direction, and extends inward in the vehicle width direction from the lower end of the first arm portion 31 a. The support plate portion 31b has a groove-like spring support portion 36 on the upper surface side. That is, the first link 31 has a spring support portion 36 on a lower end side (one end side), and an upper end side (the other end side) is coupled to the second link 32. The spring support portion 36 is a groove extending in the front-rear direction in a state of being recessed downward from the upper surface of the support plate portion 31b, and is formed in a shape of engaging with the rod-shaped portion 19 in the intermediate region 4a of the rebound spring 4 from below.
The second link 32 has a second arm portion 32a extending downward from the connecting portion 34 with the first link 31, and a locking end portion (locking portion) 32b integrally provided at the tip end of the second arm portion 32 a. That is, the second link 32 has a locking end portion 32b on a lower end side (one end side), and an upper end side (the other end side) is connected to the first link 31. The second arm portion 32a is a plate body intersecting with the vehicle width direction. The locking end portion 32b is a plate body having a substantially L-shaped cross section, which is bent inward in the vehicle width direction from the front end of the second arm portion 32a and then bent downward, and is formed so as to be lockable to the upper end portion 20 of the outer plate portion 12 of the shoe web 6 b. The locking end portion 32B has an abutment surface portion 37, and the abutment surface portion 37 abuts against the upper end portion 20 of the outer plate portion 12 from above in a state where the locking end portion 32B is locked to the upper end portion 20 of the outer plate portion 12 of the shoe web 6B from above (see fig. 5A and 5B).
Next, the lengths of the first link 31 and the second link 32 when the spring moving tool 30 is viewed from the front-rear direction will be described with reference to fig. 5A. Fig. 5A illustrates an initial state in which the spring support portion 36 of the support plate portion 31b of the first link 31 abuts against the rod-shaped portion 19 of the rebound spring 4 in the interference state from the lower side in the second direction (the direction indicated by the one-dot chain line 10 in fig. 5A), the locking end portion 32b of the second link 32 is locked to the upper end portion 20 of the outer plate portion 12 of the shoe web 6b, and the abutment surface portion 37 (see fig. 3) abuts against the upper end portion 20 of the outer plate portion 12 from the upper side in the second direction.
As shown in fig. 5A, a linear distance (first link distance) L1 between the spring receiving portion 36 of the first link 31 (in the present embodiment, the upper surface of the spring receiving portion 36) and the rotation axis CL (see fig. 3) of the shaft rod 33 is longer than a linear distance (engaged portion spring distance) L3 in the second direction (L1 > L3) between the rod-shaped portion 19 (in the present embodiment, the lower surface of the rod-shaped portion 19) of the rebound spring 4 in the interference state and the upper surface of the upper end portion 20 of the outer plate portion 12 of the shoe web 6 b. A linear distance (second link distance) L2 between the abutment surface portion 37 (see fig. 3) of the locking end portion 32b of the second link 32 and the rotation axis CL of the spindle 33 is longer than a difference between the distance L1 of the first link 31 and the distance L3 of the drum brake 1 (L2 > L1-L3). The connection portion 34 in the initial state is arranged above the upper end portion 20 of the outer plate portion 12 of the shoe web 6b in the second direction.
Next, the operation when fixing the drum brake 1 to the vehicle body side will be described based on fig. 5A, 5B, and 6. When the drum brake 1 is fixed to the vehicle body side, first, as shown in fig. 5A, the spring support portion 36 of the support plate portion 31b of the first link 31 is brought into contact with the rod-shaped portion 19 of the rebound spring 4 in the interfering state from the second direction lower side, the locking end portion 32b of the second link 32 is locked to the upper end portion 20 of the outer plate portion 12 of the shoe web 6b, and the abutment surface portion 37 is brought into contact with the upper end portion 20 of the outer plate portion 12 from the second direction upper side, so that the above-described initial state is achieved. Next, the connecting portion 34 between the first link 31 and the second link 32 is tilted (moved) upward toward the inside in the vehicle width direction (the direction toward the anchor bracket 2) (or, in other words, toward the third direction) with the abutting surface portion 37 of the locking end portion 32b of the second link 32 and the abutting portion of the upper end portion 20 of the outer plate portion 12 of the shoe web 6b as the center. That is, the connecting portion 34 is moved upward in the second direction about the contact portion between the locking end portion 32b of the second link 32 and the outer plate portion 12 of the shoe web 6 b. As shown in fig. 5B, the spring support portion 36 of the first link 31 moves upward in the second direction in accordance with the movement of the coupling portion 34, and deforms the intermediate region 4a of the return spring 4 upward in the second direction, thereby bringing the return spring 4 into a non-interfering state. Then, the connecting portion 34 of the first link 31 and the second link 32 is moved inward in the vehicle width direction than the virtual straight line 10 along the second direction connecting the rod-shaped portion 19 of the rebound spring 4 in the interfering state as viewed from the front-rear direction and the upper end portion 20 of the outer plate portion 12 of the shoe web 6B (see fig. 5B). That is, the region between the spring support portion 36 and the rotation axis CL of the shaft rod 33 in the first link 31 is formed in a shape that avoids contact with the shoe web 6b (the member constituting the drum brake 1) and allows the connecting portion 34 to move inward in the vehicle width direction with respect to the virtual straight line 10 (in the present embodiment, the first arm portion 31a is formed in a mountain shape, and the support plate portion 31b is formed in a shape extending inward in the vehicle width direction from the lower end of the first arm portion 31 a). When the connecting portion 34 crosses the virtual straight line 10 inward in the vehicle width direction on the upper side than the abutting portion between the locking end portion 32b of the second link 32 and the outer plate portion 12 of the shoe web 6b, the restoring force of the rebound spring 4 acts so that the connecting portion 34 moves downward inward in the vehicle width direction (anchor bracket side) with the center of the abutting portion between the locking end portion 32b of the second link 32 and the outer plate portion 12 of the shoe web 6 b. That is, the return spring 4 is held in the non-interfering state by the restoring force of the return spring 4. Finally, as shown in fig. 6, in a state where the rebound spring 4 is held in a non-interfering state by the spring moving tool 30, the bolt insertion hole 3 of the anchor bracket 2 is made to communicate with the bolt insertion hole 23 of the non-rotating portion 22 on the vehicle body side, the bolt 5 is inserted into the bolt insertion holes 3, 23, the bolt 5 inserted into the bolt insertion holes 3, 23 is screwed with the nut 24, and the bolt 5 is tightened by the tightening tool 17. After the bolt 5 is tightened to fasten the drum brake 1 to the vehicle body side, the connecting portion 34 between the first link 31 and the second link 32 of the spring moving tool 30 is moved outward in the vehicle width direction (in a direction away from the anchor bracket 2) about the abutting portion between the locking end portion 32b of the second link 32 and the outer plate portion 12 of the shoe web 6b, and the spring moving tool 30 is removed. In fig. 5B, the rod-shaped portion 19 of the return spring 4 before movement (in a disturbance state) is shown by a two-dot chain line.
In the spring moving tool 30 configured as described above, when fastening work is performed to insert the bolt 5 into the bolt insertion hole 3 of the anchor bracket 2 and fasten the bolt 5 when the drum brake 1 is fixed to the vehicle body side, interference between the fastening tool 17 and the rebound spring 4 can be prevented, and workability can be improved.
Further, the spring support portion 36 of the first link 31 deforms the intermediate region 4a of the resilient spring 4 upward in the second direction in a state where it abuts against the rod-shaped portion 19 of the intermediate region 4a of the resilient spring 4 in the interference state from the lower side in the second direction. As described above, since the intermediate region 4a of the rebound spring 4 is deformed upward in the second direction by bringing the spring support portion 36 into contact with the intermediate region 4a of the rebound spring 4 from the lower side in the second direction and moving the spring support portion 36 upward in the second direction, friction between the spring support portion 36 and the rebound spring 4 can be suppressed, and damage to the rebound spring 4 can be suppressed.
Therefore, according to the present embodiment, the rebound spring 4 can be brought into a non-interfering state in which it does not interfere with the fastening tool 17 at the time of fastening the bolt 5 of the drum brake 1.
Further, a linear distance L1 between the spring bearing portion 36 of the first link 31 and the rotation axis CL is longer than a linear distance L3 along the second direction between the intermediate region 4a of the rebound spring 4 in the interference state and the upper end portion 20 of the outer plate portion 12 of the shoe web 6b, and a linear distance L2 between the abutment surface portion 37 of the locking end portion 32b of the second link 32 and the rotation axis CL is longer than a difference between the distance L1 of the first link 31 and the distance L3 of the drum brake 1. The connecting portion 34 in the initial state is arranged above the upper end portion 20 of the outer plate portion 12 of the shoe web 6b in the second direction. In this way, the intermediate region 4a of the rebound spring 4 is deformed by the toggle mechanism having at least two links (the first link 31 and the second link 32) and the one-position sliding portion (the spring support portion 36 of the first link 31), and therefore the rebound spring 4 can be brought from the interfering state to the non-interfering state with a relatively small force.
In addition, the region between the spring support portion 36 and the rotation axis CL of the shaft rod 33 in the first link 31 is formed in a shape that allows the coupling portion 34 to move further inward in the vehicle width direction than the virtual straight line 10. That is, the first link 31 allows the connecting portion 34 to move inward in the vehicle width direction with respect to the virtual straight line 10, and therefore, the return spring 4 can be held in the non-interfering state by the restoring force of the return spring 4.
In the present embodiment, the intermediate region 4a of the rebound spring 4 is configured by the pair of coil portions 18a and 18b and the rod portion 19, but the present invention is not limited thereto, and for example, the entire region of the intermediate region 4a may be a coil spring. In this case, the spring support portion 36 of the first link 31 is formed in a shape that can support a coil spring.
In the present embodiment, the groove-shaped spring support portion 36 is provided in the first link 31, but the present invention is not limited to this, and at least a pair of convex portions (spring support portions) protruding upward may be provided on the upper surface of the support plate portion 31b of the first link 31 at positions spaced apart from the vehicle width direction, or a J-shaped hook (spring support portion) may be provided instead of the support plate portion 31b of the first link 31.
In the present embodiment, the engaged portion on the other side to which the locking end portion 32b of the second link 32 is locked is set as the upper end portion 20 of the outer plate portion 12 of the shoe web 6b, but the present invention is not limited to this, and a desired portion of the drum brake 1 that is disposed on the second direction side (upper side in the present embodiment) of the intermediate region 4a of the rebound spring 4 can be set as the engaged portion.
In the present embodiment, the second link 32 is provided with the locking end portion 32b having a substantially L-shaped cross section, but the present invention is not limited thereto, and the locking end portion 32b may be provided in various shapes corresponding to the shape of the locked portion (in the present embodiment, the upper end portion 20 of the outer plate portion 12 of the shoe web 6 b).
In the present embodiment, the first arm portion 31a is formed in a mountain shape, and the support plate portion 31b extends inward in the vehicle width direction from the lower end of the first arm portion 31a, so that the region between the spring support portion 36 and the rotation axis CL of the shaft rod 33 in the first link 31 is formed in a shape that allows the connecting portion 34 to move inward in the vehicle width direction with respect to the virtual straight line 10. The region between the spring support portion 36 of the first link 31 and the rotation axis CL of the shaft rod 33 may be formed in another shape that avoids contact with the components that constitute the drum brake 1 and allows the coupling portion 34 to move further inward in the vehicle width direction than the virtual straight line 10.
In the present embodiment, the initial-state connecting portion 34 is disposed at the second-direction upper side of the upper end portion 20 of the outer plate portion 12 of the shoe web 6b, but the present invention is not limited to this, and for example, the initial-state connecting portion 34 may be disposed at the second-direction lower side of the upper end portion 20 of the outer plate portion 12 of the shoe web 6 b.
In the present embodiment, when the rebound spring 4 is brought from the interfering state to the non-interfering state, the connecting portion 34 is moved inward in the vehicle width direction with respect to the virtual straight line 10, but the connecting portion 34 may not be moved inward in the vehicle width direction with respect to the virtual straight line 10.
In the present embodiment, the bolt 5 is fastened by tightening the head of the bolt 5 on the vehicle width direction outer side of the anchor bracket 2 with the fastening tool 17, but in the case where the nut 24 is provided on the vehicle width direction outer side of the anchor bracket 2, the bolt 5 may be fastened by tightening the nut 24 with the fastening tool 17.
In the present embodiment, the rebound spring 4 extending in the front-rear direction (first direction) is moved upward in the vertical direction (second direction), but the first direction and the second direction are not limited thereto. For example, the rebound spring extending in the vertical direction (first direction) may be moved to one side in the front-rear direction (second direction).
The present disclosure has been described above based on the above embodiments, but the present disclosure is not limited to the above embodiments, and it goes without saying that the present disclosure may be appropriately modified without departing from the scope of the present disclosure. That is, it is needless to say that other embodiments, examples, application techniques, and the like performed by those skilled in the art based on the embodiment are all included in the scope of the present disclosure.
For example, in the above embodiment, the drum brake 1 in which the lower end sides of the shoe webs 6a and 6b are rotatably supported by the anchor bracket 2 via the anchor pins 11 of the anchors 8 and the upper end sides are in contact with the S-cams 9 is illustrated, but the drum brake is not limited to this, and a drum brake in which the shoe webs 6a and 6b are tilted by the wheel cylinders instead of the S-cams 9, or a drum brake in which the wheel cylinders are provided between the upper end portions and the lower end portions of the shoe webs 6a and 6b and the entire shoe webs 6a and 6b are moved in directions away from each other when the brake is operated may be used.
The present application is based on the japanese patent application filed on 17.4.4.2017 (japanese application 2017-.
[ Industrial Applicability ]
The present invention has an effect of enabling the rebound spring to be in a non-interfering state without interfering with a fastening tool at the time of fastening work of a bolt of a drum brake, and is useful for a spring moving tool or the like.
[ description of reference numerals ]
1: drum brake
2: anchoring support
3: bolt through hole
4: rebound spring
4 a: middle area of rebound spring
5: bolt
6a, 6 b: a pair of hoof webs
12: outer plate part of hoof web
17: fastening tool
20: upper end portion of outer plate portion of shoe web
30: spring moving tool
31: first connecting rod
32: second connecting rod
32 b: end stop (stop part)
34: connecting part
36: spring support
Claims (5)
1. A spring moving tool for deforming an intermediate region between both end portions of a resilient spring to one side of a second direction intersecting with a first direction, when a drum brake having an anchor bracket formed with a bolt insertion hole, a pair of shoe webs arranged on both sides of the bolt insertion hole and movably supported by the anchor bracket, and the resilient spring having both end portions coupled to the pair of shoe webs and extending in the first direction in the vicinity of the bolt insertion hole between the pair of shoe webs is fixed to a vehicle body side, in order to bring a non-interference state in which a fastening tool for fastening a bolt inserted through the bolt insertion hole and the resilient spring do not interfere with each other into an interference state in which the fastening tool and the resilient spring do not interfere with each other,
the spring moving tool includes:
a first link having, on one end side, a spring support portion capable of supporting the intermediate region of the rebound spring from the other side in the second direction, and
a second link having a locking portion on one end side that can be locked to a predetermined locked portion of the drum brake disposed on the one side in the second direction in the intermediate region of the rebound spring, and having the other end side rotatably coupled to the other end side of the first link about a rotation shaft extending in the first direction;
when the coupling portion including the rotation shaft of the first link and the second link is moved to the one side in the second direction about the engagement portion of the second link from an initial state in which the spring support portion of the first link is brought into contact with the intermediate region of the rebound spring in the interference state from the other side in the second direction and the engagement portion of the second link is engaged with the engaged portion of the drum brake, the spring support portion of the first link moves to the one side in the second direction along with the movement of the coupling portion, and the intermediate region of the rebound spring is deformed to the one side in the second direction to bring the rebound spring into the non-interference state.
2. The spring travel tool of claim 1,
a linear distance between the spring support portion of the first link and the rotation shaft, that is, a first link distance, is longer than a linear distance between the intermediate region of the rebound spring in the interference state and the engaged portion in the second direction, that is, an engaged portion and an inter-spring distance;
a second link distance, which is a linear distance between the locking portion and the rotary shaft of the second link, is longer than a difference between the first link distance and a distance between the locked portion and the spring;
the coupling portion in the initial state is disposed on the one side in the second direction with respect to the engaged portion;
when the connecting portion in the initial state is moved to the one side in the second direction about the engaging portion of the second link, the connecting portion is moved in a direction approaching the anchor bracket.
3. The spring travel tool of claim 2,
a region between the spring support portion and the rotation shaft in the first link is formed in a shape that allows the coupling portion to move toward the anchor bracket side than a virtual straight line connecting the intermediate region of the rebound spring and the engaged portion in the interference state when viewed from the first direction.
4. The spring travel tool of claim 1,
the coupling portion is movable on the one side in the second direction with respect to a virtual straight line connecting the intermediate region of the rebound spring and the engaged portion of the drum brake in the interference state as viewed from the first direction, so as to exceed the virtual straight line from a side in a third direction on which the first link side is provided to the one side in the third direction, the third direction being a direction intersecting both the first direction and the second direction, with respect to an abutting portion between the engaging portion of the second link and the engaged portion of the drum brake.
5. The spring travel tool of claim 4,
when the coupling portion exceeds the virtual straight line on the one side in the third direction from the abutting portion between the locking portion of the second link and the engaged portion of the drum brake, the coupling portion is moved to the one side in the third direction and the other side in the second direction around the abutting portion between the locking portion of the second link and the engaged portion of the drum brake by a restoring force of the resilient spring, and the resilient spring is held in the non-interfering state.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-081144 | 2017-04-17 | ||
| JP2017081144A JP6807053B2 (en) | 2017-04-17 | 2017-04-17 | Spring moving tool |
| PCT/JP2018/014863 WO2018193889A1 (en) | 2017-04-17 | 2018-04-09 | Spring movement tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110520646A CN110520646A (en) | 2019-11-29 |
| CN110520646B true CN110520646B (en) | 2021-01-29 |
Family
ID=63856561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880025193.2A Active CN110520646B (en) | 2017-04-17 | 2018-04-09 | Spring moving tool |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6807053B2 (en) |
| CN (1) | CN110520646B (en) |
| PH (1) | PH12019502336A1 (en) |
| WO (1) | WO2018193889A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312702A (en) * | 1995-05-15 | 1996-11-26 | Nisshinbo Ind Inc | Automatic clearance adjuster for drum brake |
| CN101460759A (en) * | 2006-06-01 | 2009-06-17 | 汽车产品意大利（Sv）有限责任公司 | Drum brakes |
| CN201424105Y (en) * | 2009-06-08 | 2010-03-17 | 三阳工业股份有限公司 | Drum type brake mechanism |
| CN102889325A (en) * | 2011-07-22 | 2013-01-23 | 任秀军 | Drum brake with adjusting modules |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5534346Y2 (en) * | 1975-11-22 | 1980-08-14 | ||
| JPS6221783Y2 (en) * | 1980-09-25 | 1987-06-03 | ||
| DE102012218072A1 (en) * | 2012-10-03 | 2014-06-12 | Hilti Aktiengesellschaft | Hand-held tool device with a braking device for braking a machining tool |
-
2017
- 2017-04-17 JP JP2017081144A patent/JP6807053B2/en active Active
-
2018
- 2018-04-09 CN CN201880025193.2A patent/CN110520646B/en active Active
- 2018-04-09 WO PCT/JP2018/014863 patent/WO2018193889A1/en active Application Filing
-
2019
- 2019-10-14 PH PH12019502336A patent/PH12019502336A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312702A (en) * | 1995-05-15 | 1996-11-26 | Nisshinbo Ind Inc | Automatic clearance adjuster for drum brake |
| CN101460759A (en) * | 2006-06-01 | 2009-06-17 | 汽车产品意大利（Sv）有限责任公司 | Drum brakes |
| CN201424105Y (en) * | 2009-06-08 | 2010-03-17 | 三阳工业股份有限公司 | Drum type brake mechanism |
| CN102889325A (en) * | 2011-07-22 | 2013-01-23 | 任秀军 | Drum brake with adjusting modules |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018179183A (en) | 2018-11-15 |
| WO2018193889A1 (en) | 2018-10-25 |
| PH12019502336A1 (en) | 2020-09-14 |
| JP6807053B2 (en) | 2021-01-06 |
| CN110520646A (en) | 2019-11-29 |
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