JP2001140830A - Coming-out preventing member for plural pins - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent easily and quickly a plurality of pins from coming out by using a single coming-out preventing member. SOLUTION: This coming-out prevent member 60 comprises a longitudinal shape and it is provided with a first notch 62 U-shaped in a longitudinal direction on one end in the longitudinal direction and a second notch 64 U-shaped substantially perpendicular with the longitudinal direction on another end in the longitudinal direction. The coming-out preventing member 60 is moved in the longitudinal direction as shown by an arrow A for fitting the first notch 62 in an annular groove 42c of one pin 42 and it is rotated clockwise around the pin 42 as shown by an arrow B in this state for fitting the second notch 64 in an annular groove 36c of another pin 36 for performing anti-loosening of a pair of pins 36 and 42. A projection 68 is engaged to a notch provided on a shoe web 18 in a state with the second notch 64 fitted in the annular groove 36c of the pin 36 for preventing return rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pair of substantially parallel pins through which a plurality of connecting members are inserted. The pins are fitted into annular grooves provided at the tips of the pins, and the pair of pins come out of the connecting members. The present invention relates to a multi-pin retaining member for preventing the occurrence of such a problem.

[0002]

2. Description of the Related Art FIG. 5 is a schematic configuration diagram of a drum brake.
On the backing plate 10, a pair of brake shoes 12, 14 having an arc shape are provided with their shoe webs 16,
At 18, they are supported by shoe hold-down devices 20 and 22 so as to be able to expand from each other. Shoe web 16,
Opposite one ends of the wheel cylinders 18 are respectively in contact with side surfaces of an anchor 24 fixed on the backing plate 10, and the other ends of the shoe webs 16, 18 are wheel cylinders fixed on the backing plate 10. 2
6 are respectively engaged with both ends.

[0003] The shoe web 1 of the brake shoe 12
A parking brake lever 28 is rotatably attached to one end by a pin 30 at one end. An adjust lever 34 having an engaging tooth 32 formed at one end is rotatably attached to a shoe web 18 of the brake shoe 14 by a pin 36 at the other end, and an adjust latch having a latching tooth 38 is provided. 40 is rotatably attached by a pin 42. The adjusting latch 40 is constantly urged by a torsion coil spring 44 in a rotational direction (clockwise in FIG. 5) in which the latching teeth 38 mesh with the engaging teeth 32 of the adjusting lever 34. The counterclockwise rotation of the adjusting lever 34 in FIG. 5 is prevented based on the engagement between the engaging teeth 32 and the engaging teeth 38, but the clockwise rotation is allowed.
The adjustment lever 34 and the adjustment latch 4
Numeral 0 is disposed on the back side of the shoe web 18 (the backing plate 10 side).

The shoe web 16 and the parking brake lever 28 of the brake shoe 12 and the brake shoe 1
A strut 46 is bridged between the shoe web 18 of No. 4 and the adjustment lever 34. A strut 4 is provided between the strut 46 and the shoe web 16.
Spring 4 that constantly urges 6 toward brake shoe 12
When the brake shoes 12 and 14 are expanded by the wheel cylinder 26, the strut 46 moves together with the brake shoes 12 and the brake shoes 14.
Is moved in a direction away from the camera. Notches (not shown) extending in directions approaching each other are respectively formed at both ends of the strut 46, and the shoe web 16 of the brake shoe 12 and the parking brake lever 28 are fitted into one of the notches, and the other. The shoe web 18 of the brake shoe 14 and the adjustment lever 34 are fitted into the notches of the brake shoe 14. In the other notch of the strut 46, a projection (not shown) is provided which projects in a direction perpendicular to the plate surface of the backing plate 10 (the front side of the paper surface of FIG. 5).
5 with a predetermined play in the left-right direction in FIG. In FIG. 5,
50 is a shoe return spring.

In such a drum brake, when the brake shoes 12, 14 are expanded by the wheel cylinder 26, the strut 46 which moves to the left in FIG.
When the amount of relative movement of the adjustment lever 34 with respect to the adjustment lever 34 that moves to the right exceeds the predetermined play, the adjustment lever 34
Is rotated clockwise of the pin 36, and the engagement position between the engagement tooth 32 of the adjustment lever 34 and the latching tooth 38 of the adjustment latch 40 is changed, so that the brake shoes 12, 14 Is automatically adjusted, and the gap (shoe gap) between the outer peripheral surfaces of the brake shoes 12 and 14 and the inner peripheral surface of the rotating drum (not shown) is automatically adjusted.

Here, the adjustment lever 34 and the adjustment latch 40 are attached to the brake shoe 14 as shown in FIG. 6 by C-type washers 52 and 54, respectively.
Is usually mounted on the pins 36, 42. FIG. 7 is a view showing a section taken along the line VII-VII in FIG. 6, in which the pin 36 has a large-diameter head portion 36a and a shaft portion 36b.
The shaft portion 36b is provided in the through holes 18h and 34h provided in the adjustment lever 34, respectively.
4 and the shoe web 1
Annular groove 3 provided at the tip of shaft portion 36b protruding from
The C-type washer 52 is fitted into the inside of the brake shoe 14 so that the pull-out is prevented, and the adjustment lever 34 is attached to the brake shoe 14 so as not to be detached. The pin 42 is also not shown, but similarly the head 42
a, a shaft portion 42b, and an annular groove 42c. The C-type washer 54 is fitted into the annular groove 42c to prevent the pull-out, and the adjust latch 40 is permanently attached to the brake shoe 14. It is supposed to be. The C-type washers 52, 54 are provided with annular grooves 36c, 42c.
After being fitted into the opening, the opening end is caulked with pliers, pliers, or the like to prevent them from falling off. The brake shoe 14, the adjustment lever 34, and the adjustment latch 40 in FIG. 6 are slightly different in shape from those in FIG. 5, but are functionally the same.

[0007]

However, in order to prevent a plurality of pins from slipping out, it is troublesome and time-consuming to fit a C-type washer into each of the annular grooves. was there.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable a plurality of pins to be easily and quickly stopped using a single stopper member. It is to make.

[0009]

In order to achieve the above object, a first aspect of the present invention is to fit a pair of substantially parallel pins penetrating a plurality of connecting members into annular grooves respectively provided at the tips of the pins. A plurality of pin retaining members for preventing the pair of pins from coming out of the connecting member, wherein (a)
(B) a U-shaped first notch which is provided at one end in the longitudinal direction in the longitudinal direction and is fitted into one of the annular grooves of the pair of pins, c) a U-shaped second notch provided at the other end or intermediate portion in the longitudinal direction at a substantially right angle to the longitudinal direction and fitted into the other annular groove of the pair of pins. It is characterized by.

According to a second aspect of the present invention, in the multi-pin retaining member according to the first aspect, the first notch is fitted in the annular groove of the one pin and is rotated around the one pin. A disengagement preventing portion that is engaged with the other pin or the connecting member to prevent the second notch from rotating in the opposite direction while being fitted in the annular groove of the other pin. It is characterized by having.

[0011]

According to such a multi-pin retaining member, the first notch is fitted into the annular groove of one of the pins, and the second notch is rotated around the one of the pins. Since the pins can be retained only by fitting them into the annular grooves of the pins, the operation can be performed easily and quickly compared to the case where each pin is retained using a C-type washer or the like. It can be carried out. In particular, the second having a detachment prevention portion
In the present invention, caulking or the like after fitting is not required, and the work is further facilitated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is suitably applied to, for example, a pair of pins for rotatably attaching an adjust lever and an adjust latch for automatic adjustment of a shoe gap to a brake shoe of a drum brake. Similarly, the present invention can be similarly applied to retaining of various other pins that can be passed through the connecting member.

It is sufficient that at least one second notch is provided at the other end or intermediate portion in the longitudinal direction, but it is also possible to provide a plurality of second notches to simultaneously prevent the removal of three or more pins. it can. These second notches may be provided in the circumferential direction around the first notch.

Although the present invention basically has a long shape extending in the direction connecting the first notch and the second notch, it may be bent or provided with an extra portion depending on the arrangement conditions.
It can be modified as needed. In addition, at least a portion provided with the first notch and the second notch,
Although it has a plate shape that can be fitted in the annular groove, the whole may be made of a plate material.

It is made of an elastically deformable plate, and is bent so that the portion provided with the first notch and the second notch is separated from the connecting member, so that the pin is pulled by the elasticity of the retaining member. It is also possible to apply a force, and it is possible to bring the plurality of connecting members into close contact with each other and to prevent rattling due to dimensional errors.

The annular grooves of a pair of pins that are substantially parallel are usually provided so as to be located in a plane that is substantially perpendicular to the axis of the pins. However, when the connecting member has a step, The present invention can be applied even when the annular grooves of the pair of pins are located in different planes that are substantially parallel to each other, such as when the thickness of the plurality of connecting members is different. For example, a plate-shaped retaining member can be handled by bending the intermediate portion into a crank shape.

The detachment preventing portion of the second invention is provided, for example, when the thickness of the projection near the second notch is smaller than the width of the annular groove or the protrusion engaging with the notch (including the hole) provided in the connecting member. It is preferable that the engaging portion bent at a substantially right angle adjacent to the notch is configured to maintain the engagement state with the connecting member or the pin by the elasticity of the retaining member. When the first invention is carried out, the second notch is fitted into the annular groove of the other pin, and then a part of the retaining member is caulked to engage with the other pin or the connecting member to return. Rotation may be prevented.

In the case of being made of a plate material, the first
In order to facilitate the work of fitting the notch into the annular groove of one pin and then rotating around one pin to fit the second notch into the annular groove of the other pin, It is desirable to provide a gripping portion to be gripped with a finger or a tool at a substantially right angle at the other end.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1A and 1B are views showing a retaining member 60 according to an embodiment of the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a right side view of FIG. As described above, this is used for preventing the pins 36 and 42 of the drum brake shown in FIG. In the present embodiment, the brake shoe 14 and the adjustment lever 34 connected by the pin 36 and the brake shoe 14 and the adjustment latch 40 connected by the pin 42 correspond to a plurality of connection members. The annular grooves 36c and 42c of the pair of pins 36 and 42 are
The pins 36 and 42 are positioned in a plane substantially perpendicular to the axis thereof, that is, in a common plane substantially the same as the upper surface of the shoe web 18 (the surface on the front side of the paper in FIG. 2A). ing.

The retaining member 60 includes the annular grooves 36c and 4c.
It is made of an elastically deformable plate that is substantially the same as or thinner than the groove width of 2c, has a longitudinal shape,
One end 60a in the longitudinal direction is provided with a first U-shaped notch 62 in the longitudinal direction, while the other end 60c in the longitudinal direction is provided.
Is provided with a U-shaped second notch 64 substantially perpendicular to the longitudinal direction. The width of the first notch 62 and the second notch 64 is the same as or slightly larger than the diameter of the groove bottom of the annular grooves 42c and 36c, and fits into the annular grooves 42c and 36c. It is possible. In this embodiment, the diameters of the bottoms of the annular grooves 42c and 36c are substantially the same.

Such a retaining member 60 is shown in FIG.
First, as shown by arrow A, the first notch 62 is moved in the longitudinal direction as shown by arrow A to fit into the annular groove 42c of one of the pins 42, and then the pin 42 as shown by arrow B in that state.
Of the second notch 64 to the other pin 36
May be fitted into the annular groove 36c. The other end 60c of the retaining member 60 is provided with a grip 66 bent and raised at a substantially right angle along the longitudinal direction on the side opposite to the second notch 64, and the grip 66 is pressed with a finger or a tool. By gripping, the mounting operation can be easily performed.

In the intermediate portion 60b in the longitudinal direction, a notch 18a formed in the shoe web 18 of the brake shoe 14 as shown in FIG. At the corresponding position, a projection 68 projecting toward the shoe web 18 side is provided, and when engaged with the notch 18a, the retaining member 60 rotates in the opposite direction, that is, returns to the counterclockwise direction of the pin 42 and rotates. The two notches 64 are prevented from coming off the pins 36. The protrusion 68 corresponds to a detachment prevention portion, and is provided by a punch or the like.

As shown in FIG. 1 (b), the retaining member 60 also has an intermediate portion 60 provided with the projection 68.
b, both ends 6 where notches 62 and 64 are provided
0a and 60c are bent so as to slightly rise from the shoe web 18, and the annular groove 4 provided at a position substantially the same as or slightly protruding from the upper surface of the shoe web 18.
When the notches 62 and 64 are fitted in the 2c and 36c, the intermediate portion 60b is elastically pressed against the upper surface of the shoe web 18. As a result, a tensile force is applied to the pair of pins 36 and 42, and the adjusting lever 3 attached to the brake shoe 14 by the pins 36 and 42.
4 and the play of the adjustment latch 40 are suppressed. In addition, the protrusion 68 is elastically engaged with the notch 18a, and the return rotation of the retaining member 60 is reliably prevented regardless of the vibration of the wheel or the like.

As described above, according to the retaining member 60 of the present embodiment, the first notch 62 is fitted into the annular groove 42c of the one pin 42, and is rotated around the one pin 42 to form the second notch 62. By simply fitting the notch 64 into the annular groove 36c of the other pin 36, it is possible to prevent the pins 42, 36 from being removed. The operation can be performed easily and quickly as compared with the case. Moreover, in the present embodiment, when the second notch 64 is rotated until it is fitted into the annular groove 36c of the other pin 36, the projection 68 is engaged with the notch 18a so that the return rotation is prevented. Therefore, caulking or the like after fitting is not required, and the work is further facilitated.

The retaining member 60 according to the present embodiment is made of an elastically deformable plate material.
Since both end portions 60a and 60c fitted into 36 are bent in a direction to float from shoe web 18, intermediate portion 60b is connected to shoe web 18 in the mounted state.
, And the pulling force is relatively applied to the pins 36 and 42 to suppress the play of the adjustment lever 34 and the adjustment latch 40, and the engagement state between the projection 68 and the notch 18a is favorably maintained. Thus, the return rotation of the retaining member 60 is reliably prevented.

In the above embodiment, the projection 68 and the notch 18
4, the return rotation is prevented. However, for example, as shown in FIG. 4, the width of the annular groove 36c is made larger than the thickness of the retaining member 60, and A pair of engaging portions 70 are provided by bending both sides of the open end by approximately 90 °, and the engaging portions 70 and the shaft portions 36 b of the pins 36 are provided.
It is also possible to prevent the return rotation of the retaining member 60 by engaging with the tip of the stopper. The engagement between the engaging portion 70 and the tip of the shaft portion 36b is determined by the elasticity of the retaining member 60.
C is satisfactorily held by being urged in a direction away from the shoe web 18. The engagement portion 70 corresponds to a disengagement prevention portion. In FIG. 4, a pair of engaging portions 70 are provided on both sides of the opening end of the second notch 64, but may be provided on only one of them. 4A is a plan view corresponding to FIG. 2A, and FIG. 4B is a sectional view taken along line BB in FIG.

The embodiments of the present invention have been described in detail with reference to the drawings. However, these embodiments are merely examples, and for example, the first notch provided in the longitudinal direction is configured to engage with the pin 36. For example, the present invention can be implemented in various modified and improved aspects based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a plurality of pin retaining members according to an embodiment of the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a right side view of FIG.

FIGS. 2A and 2B are views showing an example of use of the retaining member of FIG. 1, wherein FIG. 2A is a plan view of the brake shoe attached to the brake shoe, and FIG.

FIG. 3 is a cross-sectional view showing a detachment prevention portion of the retaining member of FIG. 1;

4A and 4B are diagrams showing another example of a detachment prevention portion of the retaining member of FIG. 1, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line BB in FIG.

FIG. 5 is a plan view showing an example of a brake drum in which the retaining member of FIG. 1 is preferably used, which is a conventional example.

FIG. 6 is a plan view showing one brake shoe in which a pair of pins are prevented from coming off by C-type washers, respectively, and is a view corresponding to FIG. 2 (a).

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

[Explanation of symbols]

14: Brake shoe (connecting member) 34: Adjust lever (connecting member) 36, 42: Pin 36c, 42c: Annular groove 4
0: Adjust latch (connecting member) 60: Prevention member 62: First notch 64: Second notch 68: Projection (separation prevention part) 70: Engagement part (separation prevention part)

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3J037 AA08 BB03 JA02 3J058 AA03 AA07 AA13 AA17 AA24 AA28 AA33 AA37 BA64 CA07 FA01

Claims (2)

[Claims] 1. A plurality of pins, each of which is fitted in an annular groove provided at a tip of a pair of substantially parallel pins penetrating a plurality of connecting members to prevent the pair of pins from coming out of the connecting members. A pin retaining member, which has a longitudinal shape, and is formed in a longitudinal direction at one end portion in the longitudinal direction, and has a U-shape which is fitted in the annular groove of one of the pair of pins. A first notch; a U-shaped second notch provided at the other end or intermediate portion in the longitudinal direction at a substantially right angle to the longitudinal direction and fitted into the other annular groove of the pair of pins; A multi-pin retaining member comprising: 2. The first notch is fitted into the annular groove of the one pin, and is rotated around the one pin so that the second notch is inserted into the annular groove of the other pin. The pin according to claim 1, further comprising: a disengagement prevention portion that is engaged with the other pin or the connecting member in the fitted state to prevent the return pin from rotating in the opposite direction. Retaining member.