JP4005894B2 - Brake cable connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection device of a brake cable enabling simple, sure cable-connecting work by employing a simple structure. <P>SOLUTION: A connection pin 43 is inserted in a single hole 23p formed in one of opposing pieces 23b of a strut 23 rotatably pivoting a plate-like operation lever 24 housed in a space 23c, and a holding member 30 for holding the connection pin 43 is rotatably installed outside. A cable end 42 is inserted into the space 23c of the strut 23 from a cable towing direction so as to align connection holes 42c, 24f and 42c of the connection pin 43, the cable end 42 and the operation lever 24, and the connection pin 43 are automatically inserted in these holes by an elastic force of the holding member 30. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical shoe extension device, and more particularly, to a brake cable connecting device for connecting a brake cable to a mechanical operating mechanism including a strut and an operation lever as main components.
[0002]
[Prior art]
This type of brake cable connecting device includes a plate-like operation lever, a strut that is pivotally supported by accommodating the operation lever inside, and a mechanical operation mechanism that includes a pivot pin. This mechanical actuating mechanism is arranged between a pair of brake shoes. By pulling the brake cable connected to the control lever, the control lever rotates relative to the pivot point of the strut, and both directions are opposite to each other. It is a mechanism that expands.
In the conventional brake cable connecting device, the operating lever and the strut are contracted by the urging force of the shoe return spring in the direction opposite to the expansion direction, and the operating lever abuts on the connecting portion of the strut, The connection hole of the operation lever for connecting the connection pin is in a state protruding from the opening of the strut. (See, for example, paragraph 0015 of Patent Document 1)
[0003]
In addition, after the brake cable is connected to the operation lever, a holding member (clip) formed by bending in a substantially U-shape is sandwiched and engaged with the strut so that the operation lever is positioned in the space of the strut. It has become. (See paragraphs 0008 and 0017 of Patent Document 1)
[0004]
[Patent Document 1]
JP 2001-349360 A (page 3-5, FIG. 2-8)
[0005]
[Problems to be solved by the invention]
According to the connection device of the prior serial and brake cables, the operating lever and the strut is deflated me than the biasing force of the shoe return spring in a direction opposite to the direction of extension of the brake shoes each other, the operating lever connecting portion of the strut those Touching.
In order to establish this relationship in consideration of manufacturing dimensional tolerances, it is necessary to provide a gap between the brake shoes and the anchor.
This gap is further increased when the brake cable is connected to the operation lever, and is maximized when the brake cable is operated.
In order to apply the braking force, it is necessary to rotate the brake shoe until it fills one of these spaces depending on the direction of rotation of the brake drum. As a result, a stronger impact load is applied to the anchor, which is disadvantageous in terms of strength. As well as making a loud impact sound.
[0006]
Further, the holding member to prevent the coming off from the strut, it is necessary to perform the fitting process for prevention out both parts of the holding member and the strut, the processing cost is increased.
[0007]
Further, the separate holding member is not only difficult to handle but may be lost.
[0008]
Moreover, operations that match engaged by sandwiched strut pushes the holding member when connecting the brake cable is required, further increasing the working steps.
Further, there may forget the only assembling of the holding member, and further, there is also a risk that not assembled to a normal state by mistake assembly of the holding member.
[0009]
The present invention has been made in view of the above points, and an object of the present invention is to provide a brake cable connection device that can easily and reliably perform a brake cable connection operation with a simple structure. There is.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a brake cable connecting device according to the present invention includes a strut that engages with one brake shoe, a plate-like operation lever that engages with the other brake shoe, and a play of the operation lever. Brake cable equipped with a cable end that forms a pair of ear pieces with a distance through which the end portions can be inserted, and the operating lever can be accommodated in the space between the opposing pieces of the strut and the base end portion can be rotated And the free end of the operating lever is inserted between the pair of ear pieces of the cable end and connected with a connecting pin, and when the brake cable is pulled, the operating lever supports the supporting portion with the strut. In the brake operating mechanism that rotates relative to each other and expands in the opposite direction to each other, one of the struts is placed on the rotation trajectory of the connecting hole formed in the operation lever. A hole through which the connecting pin is inserted is formed in the opposing piece, the holding member is rotatably mounted on the one opposing piece, and the connecting pin inserted and disposed in the one opposing piece is provided with an elastic force of the holding member. When the cable member end of the brake cable is inserted into the space of the strut and the holding member is rotated in the anti-cable pulling direction by the ear piece of the cable end, the connecting pin is connected by the elastic force of the holding member. Is configured to fit into a connecting hole formed in the ear piece of the cable end and a connecting hole of the operation lever.
[0011]
According to the connection device of the prior serial and brake cables, a simple structure of only mounting the holding member to the strut advance, while preventing falling off of the connection pin can be held to the strut, handleability Ibakari either lost There is no fear.
Furthermore, the operation of connecting the free end portion of the operation lever and the brake cable can be easily performed simply by pushing the brake cable.
Further, after connecting the free end portion of the operating lever and the brake cable by connecting the connecting pins, a part of the holding member and the opposing piece of the strut can reliably prevent the connecting pins from coming out. There is no worry of forgetting to engage the holding member.
[0012]
Furthermore, the present invention may be configured such that in the brake cable connecting device described above, the rotation shaft of the holding member is a common shaft with the rotation shaft of the operation lever.
In the present invention, there is no need to newly provide a pivot shaft for the holding member, and the cost is low.
[0013]
Further, according to the present invention, in the above-described brake cable connecting device, the holding member can be brought into contact with the cable end of the brake cable, the driven piece urged toward the approaching direction by the operating piece, and these A connecting portion for connecting the base ends of the two pieces to transmit the rotation of the operating piece to the driven piece;
In the present invention, the formation of the holding member is relatively simple and inexpensive.
[0014]
Further, according to the present invention, in any one of the brake cable connecting devices described above, a guide portion for guiding the cable end of the brake cable is formed on the opposing piece of the strut.
In the present invention, since the end portion of the brake cable can be reliably guided to the predetermined coupling position, the workability of connecting the brake cable and the free end portion of the operation lever is improved.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a brake cable connecting device according to the present invention will be described with reference to the drawings.
[0016]
Embodiments of the present invention will be described with reference to the drawings. Note that “upper / lower” and “left / right” in this description are based on FIG. 1 unless otherwise specified.
1 to 3 show a state where the connection of the brake cable is completed.
A pair of brake shoes 12 and 13 are movably mounted on a back plate 11 fixed to the stationary part 10 of the vehicle body by a shoe hold mechanism (not shown), and a lower adjacent end thereof is described later. The upper adjacent end (not shown) is coupled by a connecting member.
A pair of upper and lower shoe return springs stretched between the brake shoes 12 and 13 (only the lower lower shoe return spring 19 is shown) abuts both ends of the brake shoes 12 and 13 with the anchor 16 and the connecting member. The state is maintained.
A mechanical operating mechanism 22 that expands the lower adjacent ends of the brake shoes 12 and 13 includes a strut 23, an operating lever 24, a pivot pin 25 and a locking washer 26. The brake shoes 12 and 13 are inserted adjacent to each other.
The strut 23 has a space formed therein so as to surround the operation lever 24.
[0017]
The anchor 16 has an upright portion 16a and a seat portion 16b with a substantially L-shaped cross section, and the seat portion 16b sandwiches the back plate 11 between the mounting bolts 20, 21 and corresponding nuts (not shown). Thus, it is fixed to the stationary part 10 of the vehicle body.
[0018]
FIG. 4 is an exploded perspective view of the mechanical operating mechanism 22, the holding member 30, the brake cable 40, and the connecting pin 43, and the components will be described in detail with reference to this.
The strut 23, which is one of the constituent members of the mechanical operating mechanism 22, is composed of two plate-like opposing pieces 23a and 23b. The left sides of the opposing pieces 23a and 23b are overlapped and adhered by welding or the like. A wide space (gap) 23c is formed at an intermediate portion in the longitudinal direction, and a space (gap) 23d narrower than the space 23c is connected to the right. The overlapped portion of the left side of the strut 23, a shoe engagement groove 23e is formed, pivot holes 23f, 23f are formed on the right side.
Skirt-like extended portions 23g and 23g having an increased opposing distance are formed at the skirts on the cable pulling direction side of both opposing pieces 23a and 23b, and either one of the opposing pieces (23a in the present embodiment). 4, a pair of guide portions 23h and 23j are formed in a substantially C shape as shown in FIG. 4, and the brake cable 40 is connected to the operation lever 24 by the extended portions 23g and 23g and the pair of guide portions 23h and 23j. The cable end 42 can be guided to a predetermined position in the wide space 23c when coupled to the free end 24e.
Incidentally, extension 23 g, 23 g and the pair of guide portions 23h, 23j is not an essential configuration elements.
[0019]
In this example, a holding member 30 having a function to be described later is added to the mechanical operating mechanism 22.
In this example, the other facing piece 23b of the holding member 30 is rotatably mounted on the other facing piece 23a, and the one facing piece 23a is provided for restricting the rotation of the operation lever 24 in the anti-cable pulling direction within a certain range. lever stopper 23k is projected to narrow space 23d, the other part of the outer end surface of the proximal end portion side of the facing plates 23b, the holding member 30 a stopper for limiting the rotation in a range of 23m and 23n are projected.
Further, a single hole 23p through which the connecting pin 43 can be inserted is formed in the other facing piece 23b. The single hole 23p is a hole for holding the connecting pin 43 inserted from one side of the strut 23 in cooperation with the holding member 30 before the brake cable 40 is connected to the free end 24e of the operating lever 24. Yes, as long as it is formed on the rotation locus of the connecting hole 24f formed in the free end 24e of the operation lever 24 to be described later.
[0020]
The operation lever 24, which is a constituent member of the mechanical operating mechanism 22, is composed of a single plate and is accommodated so as to be sandwiched between the spaces 23c and 23d of the strut 23.
A shoe engagement groove 24b is formed in the right base 24a of the operation lever 24, and a pivot hole 24d through which the pivot pin 25 is inserted into one projection 24c that defines the shoe engagement groove 24b. , And a stopper washer 26 is attached to the tip of the pivot pin 25 inserted through the pivot holes 23f, 24d, and 23f of the strut 23 and the operation lever 24, and the operation lever 24 is rotated with respect to the strut 23. It is pivotally supported.
The upper end surface of the operation lever 24 abuts on the lever stopper 23k of the strut 23, whereby the clockwise rotation in FIG.
A connecting hole 24f is formed in the free end 24e on the left side of the operation lever 24 so that a cable end 42 fixed to an end of an inner cable 41 constituting a brake cable 40 to be described later can be connected via a connecting pin 43. Has been.
[0021]
Note that the struts 23 and the operation lever 24 constituting the mechanical operating mechanism 22 have their outer end surfaces (sliding contact surfaces) 23s, 24h on the cable pulling direction side as shown in FIG. It is slidably in contact with the part.
[0022]
As shown in FIG. 5, the holding member 30 is formed by bending a sheet steel plate so that the overall shape is substantially U-shaped, and includes an operating piece 31, a driven piece 32 opposite to the operating piece 31, It is comprised by the connection part 33 which connects between the base end parts of 31 and 32 across.
Connection holes 31 a and 32 a are formed in the base end portions of both pieces 31 and 32.
An intermediate portion between the base end portion and the free end portion of the operating piece 31 is bent so as to be offset in a direction approaching the driven piece 32, and a bent piece 31b protruding perpendicularly from one side end of the free end portion is provided. Is formed.
A protrusion 32 c is formed on the inner surface of the distal end portion 32 b that has a bowl shape of the free end portion of the driven piece 32 toward the operating piece 31.
The protrusion 32c has a mountain shape or an arc shape in cross section, and can be formed by pressing or the like. In order to reduce the spring constant between the base end portion and the free end portion of the driven piece 32 of this example, a U-shaped portion 32d is formed by bending the plate piece into a bow shape, but this is not essential.
[0023]
As shown in FIG. 1, the holding member 30 has a base end portion of both pieces 31 and 32 that is externally mounted on the right side of the other facing piece 23 b constituting the strut 23, and a pivotal support of the base end portion of the facing piece 23 b. The hole 23f and the connection holes 31a and 32a at the base ends of both pieces 31 and 32 are aligned and pivotally supported by the pivot pin 25. In the state where the holding member 30 is pivotally supported, the entire length of the operating piece 31 is such that the bent piece 31b of the free end can abut against the outer end surface of the cable end 42, and a part of the free end is a single unit of the strut 23. The dimension is set so as to block the hole 23p and prevent the connection pin 43 from passing therethrough. Further, in the state where the holding member 30 is pivotally supported by the pivot pin 25, the total length of the driven piece 32 is set to a dimension such that the protrusion 32 c of the tip end portion 32 b reaches the center of the single hole 23 p of the strut 23. The overall length of the operating piece 31 and the driven piece 32 is set to the dimensions of the above, when the holding member 30 receives the insertion force of the cable end 42 during assembly of the brake cable 40 is rotated, the follower piece 32 This is because the connecting pin 43 is automatically inserted into and connected to the cable end 42 and the connecting holes 42c, 24f, 42c of the operating lever 24 using the elastic force of the above.
[0024]
As shown in FIGS. 2 to 4, the brake cable 40 includes an inner cable 41, an outer casing 44, and the like, and one end portion on the drum brake side is arranged as follows.
The other end of the guide pipe 45 having one end fixed to the seat 16b of the anchor 16 extends through the back plate 11 and the stationary part 10 of the vehicle body. One end of the brake cable 40 is inserted into the guide pipe 45 and the casing cap 44 a of the outer casing 44 is fitted into the other end of the guide pipe 45 and is fastened by a retaining ring 46.
The cable end 42 fixed to the end portion of the inner cable 41 is formed with a pair of ear pieces 42b and 42b spaced from each other so as to be able to accommodate the operation lever 24 in the plate thickness direction. Connection holes 42c and 42c for connecting the connection pins 43 are formed in the ear pieces 42b and 42b.
The free end portion 24e of the operation lever 24 is accommodated between the pair of ear pieces 42b, 42b, and the connection holes 42c, 42c and the connection hole 24f of the operation lever 24 are aligned to be connected by the connection pin 43.
[0025]
Next, a method for connecting a brake cable will be described with reference to FIGS.
6 and 7 show the main part of the mechanical operating mechanism 22 before the brake cable 40 is connected to the operating lever 24. The free end 24e of the operating lever 24 is located in the wide space 23c of the strut 23. FIG. and, retaining member 30 is assembled in advance to the right in FIG. 6 facing plate 23b of the strut 23 via the pivot pin 25.
The connecting pin 43 inserted in the single hole 23p of the strut 23 is located between the free end portion of the operating piece 31 of the holding member 30 and the tip end portion 32b of the driven piece 32, and the inner side surface of the connecting pin 43 is the holding member 30. The connecting pin 43 is prevented from projecting into the wide space 23c of the strut 23, and is elastically stored in the entire driven piece 32. It is held by force.
Further, when holding the connecting pin 43 on the holding member 30, the holding member 30 is rotated in the cable pulling direction so that the protrusion 32 c is positioned on the cable pulling direction side of the connecting pin 43.
[0026]
Next, when the inner cable 41 is pinched and inserted into the guide pipe 45 as indicated by arrows in FIG. 7, the ear pieces 42 b and 42 b of the cable end 42 fixed to the end of the inner cable 41 are wide spaces of the struts 23. The free end 24e of the operation lever 24 is reached through 23c.
Meanwhile, while the cable end 42 is guided by the extended portions 23g and 23g formed on the strut 23 and the pair of guide portions 23h and 23j, the ear pieces 42b and 42b are opposed to the free end portion 24e of the operation lever 24 and the strut 23. It is inserted into the gap between the pieces 23a and 23b and guided in the direction of the connection position. When the inner cable 41 is further pushed in, the operation lever 24 and the holding member 30 are rotated about the pivot pin 25 in the anti-cable pulling direction.
[0027]
The rotation operation of the operation lever 24 and the holding member 30 will be described in detail. When the inner cable 41 of the brake cable 40 is pushed in, the ear piece 42b of the cable end 42 first comes into contact with the bent piece 31b of the holding member 30, and only the holding member 30 rotates about the pivot pin 25. . Subsequently, the base portion 42a that connects the pair of ear pieces 42b and 42b contacts the operation lever 24, and thereafter, the operation lever 24 and the holding member 30 rotate together. (Fig. 8)
[0028]
At this time, the rotation of the operating piece 31 is transmitted to the opposite driven piece 32 through the connecting portion 33, so that the driven piece 32 rotates (follows) in the same direction as the operating piece 31, and moves to the distal end portion 32 b of the driven piece 32. The formed protrusion 32 c rides on the connecting pin 43 and reaches the center position of the single hole 23 p of the strut 23. (Fig. 9)
[0029]
The pair of guide portions 23h and 23j formed in the strut 23 match the positions of the connecting holes 42c, 24f and 42c of the cable end 42 and the operating lever 24, and the single hole 23p for receiving the connecting pin 43 has an operating lever. since that is formed on a rotation locus of the connecting hole 24f of 24, comprising a single-hole 23p of the strut 23, the connecting hole 42c of the cable end 42 and the operating lever 24, 24f, to 42c are aligned on the same axis .
[0030]
When the holding member 30 is rotated, the connecting pin 43 is pushed and connected to the connecting holes 42c, 24f and 42c of the operating lever 24 by the elastic force stored in the driven piece 32, and the protrusion 32c is formed in the single hole 23p. The tip is inserted and protrudes into the space 23c of the strut 23.
After the connection pin 43 is connected, the outer casing 44 is fixed to the guide pipe 45, and the connection work between the brake cable 40 and the mechanical operation mechanism 22 is completed.
In the present invention, the insertion operation of the connecting pin 43 is completed by a simple operation of simply pushing the brake cable 40, and the connection work between the free end 24e of the operation lever 24 and the cable end 42 of the brake cable 40 is ensured . You can line Ukoto.
[0031]
At this time, the connecting pin 43 is restricted from being pulled out by the opposing piece 23 a of the strut 23 and the protrusion 32 c of the holding member 30.
For this reason, the connecting pin 43 is always located in the wide space 23c of the strut 23, and the cable end 42 is not inadvertently detached from the operation lever 24 while the drum brake is being transported or while the vehicle is traveling.
[0032]
Moreover, the mechanical actuating mechanism 22 according to the invention, which is pre-serial, although an example was placed on the head of the mounting bolt 20, 21 of the anchor 16 in the duo-servo type drum brake, intended to be limited to this For example, when the anchor 16 has a pin-shaped anchor pin shape, the mechanical operation mechanism 22 may be placed directly on the back plate 11.
[0033]
【The invention's effect】
As described above, according to the present invention, the connection work between the brake cable and the mechanical operation mechanism can be performed by a simple operation of simply pushing the brake cable 40 by simply attaching the holding member to the strut in advance. It can be done reliably.
[Brief description of the drawings]
FIG. 1 is a front view of a mechanical operating mechanism of a drum brake equipped with a brake cable connecting device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. -III sectional view [Fig. 4] Perspective view of brake cable connecting device [Fig. 5] Perspective view of holding member [Fig. 6] Front view of mechanical operating mechanism before insertion of connecting pin [Fig. 7] Sectional view of the mechanical operating mechanism before insertion [FIG. 8] Explanatory view of the mechanical operating mechanism at the time of inserting the connecting pin [FIG. 9] Explanatory view of the mechanical operating mechanism at the time of inserting the connecting pin [FIG. Explanation of symbols]
10 body immobile portion 11 back plate 12, 13 the brake shoes 16 anchor 20, 21 mounting bolt 22 mechanical actuation mechanism 23 struts 23a, 23b facing plate 23c wider space 23d narrow space 23e shoe engagement groove 23f pivot hole 23g Extension part 23h, 23j Guide part 23k Lever stopper 23m, 23n Stopper 23p Single hole 23s Outer end surface 24 Operation lever 24a Base part 24b Shoe engagement groove 24c (One) Protrusion part 24d Pivot hole 24e Free end part 24f Connection hole 24h Outer end face 25 Pivoting pin 25 Stop washer 30 Holding member 31 Actuating piece 31a Connection hole 31b Bending piece 32 Driven piece 32a Connection hole 32b Tip part 32c Projection 32d U-shaped part 33 Connection part 40 Brake cable 41 Inner cable 42 Cable end 42a Base 42b Ear piece 42 Connecting hole 43 connecting pin 44 the outer casing 44a housing cap 45 a guide pipe 46 Lock Washer

Claims (4)

A cable end formed with a strut that engages with one brake shoe, a plate-like operation lever that engages with the other brake shoe, and a pair of ear pieces that have a space through which the free end of the operation lever can be inserted. A brake cable, and an operation lever is accommodated in a space between the opposing pieces of the strut so that its base end portion is pivotally supported, and the free end portion of the operation lever is connected to a pair of ears of the cable end. In the brake operating mechanism in which the operation lever rotates relative to the pivot point of the strut as a fulcrum, and both extend in opposite directions when the brake cable is pulled by being inserted into a piece and connected by a connecting pin. ,
Forming a hole through which the connection pin is inserted into one opposing piece of the strut on the rotation trajectory of the connection hole formed in the operation lever;
The holding member is rotatably mounted on the one opposing piece,
Holding the connecting pin inserted and arranged in the one opposing piece by the elastic force of the holding member;
When the cable end of the brake cable is inserted into the space of the strut and the holding member is rotated in the anti-cable pulling direction by the end piece of the cable end, the connecting pin is connected to the cable end by the elastic force of the holding member. It is characterized by being configured to fit into a connection hole formed in the ear piece and a connection hole of the operation lever.
Brake cable connection device.     The brake cable connecting device according to claim 1, wherein the rotation shaft of the holding member is a common shaft with the rotation shaft of the operation lever.     3. The holding piece according to claim 1 or 2, wherein the holding member is capable of coming into contact with a cable end of a brake cable, a driven piece urged toward the approaching direction by the operating piece, and base ends of the two pieces. And a connecting part for transmitting the rotation of the operating piece to the driven piece.     4. The brake cable connecting device according to claim 1, wherein a guide portion for guiding the cable end of the brake cable is formed on the opposing piece of the strut.

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