JPH09203405A - Split pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split pin easy to be attached/detached and usable repeatedly. SOLUTION: An inserting part 30 of an inserting leg part 12b of a split pin 10 is inserted into a through hole 3 of a ball stud 1. The split pin 1 is pushed in until it deforms elastically, so that a presser leg part 12a strides the tip end part of the ball stud 1. An elastic holding part 22, which is provided to the inserting leg part 12b and which is of nearly a letter-U-shape, is elastically deformed to flat, and the elastic holding part 22 is inserted into a through hole 3. Then, since the presser leg part 12a, which was expanded/opened, returns to its original state because of elastic force, the tip end of an engaging part 17 is connected to the through hole 3. The holding part 15 of presser leg part 12a abuts on the tip edge of the ball stud 1, the tip end part of the ball stud 1 is held/fixed by the engaging part 17 connected to the through hole 3. Stretching parts 28a, 28b of the elastic holding part 22 abut on tapered surfaces 4a, 4b of the periphery of the through hole 3, respectively, while a pressing/holding part 29 of the elastic holding part 22 abuts on the inner peripheral surface of the through hole 3, so that the split pin 10 can be installed without rattling. Owing to the elastic deformation without plastic deformation, the split pin 10 can be used repeatedly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split pin that prevents a mounting body attached to a shaft portion from falling off.

[0002]

2. Description of the Related Art Conventionally, as a split pin of this type, for example, a structure shown in FIGS. 4 to 6 has been known.

The split pin 40 shown in FIGS. 4 to 6 is
A metal-made substantially elongated rod shape is formed by folding back an intermediate portion into a substantially arc shape to form a folded portion 41, and leg portions 42, 42 are abutted and extended from the folded portion 41 in the same direction.

On the other hand, in FIGS. 5 and 6, reference numeral 44 designates a ball stud of a ball joint.
A male screw portion 46 is formed on the upper end of 44, and a through hole 47 is formed in the male screw portion 46 in the diameter direction. Further, 49 is a castle nut, and the castle nut 49 is screwed to the male screw portion 46 and has a plurality of cut grooves 50 formed radially on the one end surface thereof from the center in a radial manner.

Then, the upper end of the ball stud 44 is inserted into, for example, an insertion hole of a knuckle arm (not shown), and a male nut portion 46 of the ball stud 44 protruding from the insertion hole is formed with a castle nut 49 and a through hole 47 and a cut groove 50. Rotate and screw in until they are in line with each other. Thereafter, the leg portions 42, 42 of the split pin 40 are inserted until the folded-back portion 41 abuts on the peripheral edge of the cut groove 50 communicating with the through hole 47, and the leg portion 42 protruding from the cut groove 50 through the through hole 47. Using a jig such as pliers (not shown), the tip of the is plastically deformed and bent along the outer peripheral surface of the castle nut 49 to prevent the castle nut 49 from falling off, as shown in FIG. 5 or 6. There is.

[0006]

However, since the split pin 40 having the conventional structure shown in FIGS. 4 to 6 is plastically bent by using a jig such as pliers (not shown), the work for attaching the split pin 40 is performed. Is complicated and the legs
Depending on the bent state of 42, 42, there is a problem such as the split pin 40 rattling.

Further, when the ball joint is disassembled and maintained, the plastically bent legs 42, 42 of the split pin 40 are bent again so that they can be inserted into the through hole 47 and the cut groove 50, and the folded portion 41 is pliers. Pull out with a jig such as to remove the castle nut 49 and disassemble, so the leg part 42 of the extracted split pin 40
Is complicatedly deformed, so the
There is a problem that it is difficult to insert it into the groove 47 and the kerf 50, metal fatigue is caused by plastic bending, it cannot be reused, and cost reduction is also restricted.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a split pin which can be easily attached and detached and can be reused.

[0009]

According to a first aspect of the present invention, there is provided a split pin which is folded back to one end side and is engaged with one end side of a through hole formed in a radial direction of a shaft portion to which an attachment body is attached. A folded-back portion, an insertion leg portion extending from one end portion of the folded-back portion and inserted into the through hole, and a shaft portion extending from the other end portion of the folded-back portion in substantially the same direction as the insertion leg portion. A pressing leg portion at least a part of which abuts on the outer surface of the pressing leg portion, and a distal end portion of the pressing leg portion is formed by bending toward the base end side of the insertion leg portion,
A tip portion is provided with a locking portion that is locked to the other end side of the through hole, and after the mounting body is attached to the shaft portion, while inserting the insertion leg portion from one end of the through hole of the shaft portion, When the presser leg is elastically deformed so as to straddle the outer surface of the shaft to widen the space between the insertion leg and the presser leg, and the locking part provided at the tip of the presser leg passes the outer surface of the shaft. The tip of the locking part that elastically returns to and bends toward the base end side of the insertion leg engages the other end of the through hole, so locks on the side opposite to the insertion direction into the through hole. Since the parts are bent, it is easy to install, it is securely held and the attachment body is prevented from falling off, and it can be removed simply by elastically deforming the pair of insertion leg parts and presser foot parts to expand. It can be reused without being plastically deformed when it is attached or detached.

According to a second aspect of the present invention, in the split pin according to the first aspect, the presser leg portion is bent in a direction in which the engaging portion is bent between the engaging portion and the folding portion. A holding part that clamps and fixes the outer surface of the shaft part by elasticity with the locking part is provided.After attaching the mounting body to the shaft part, the insertion leg part is inserted into the through hole of the shaft part Section is elastically deformed so as to straddle the outer surface of the shaft section to expand the space between the insertion leg section and the presser leg section, and when the locking section passes the outer surface of the shaft section, the elastic force returns to the locking section. Of the shaft engages with the through hole, and the holding part formed by bending the holding leg part in the bending direction of the locking part locks on the outer surface of the shaft part. Since the parts are clamped and fixed, stable mounting is easy and surely held, the attachment body is prevented from falling off, and the pair of insertion legs and presser legs are expanded. The only removable and is elastically deformed, it is possible reuse without plastic deformation during detachment.

A cotter pin according to a third aspect is the cotter pin according to the first or second aspect, in which the insertion leg portion is bent so as to be wider than the diameter dimension of the through hole so as to extend into the through hole. An elastic holding part that is elastically deformed during insertion to reduce the bending width dimension was provided.After the mounting body was attached to the shaft part, it was bent wider than the diameter dimension of the through hole. While elastically deforming the elastic holding part, the insertion leg part is inserted into the through hole, and elastically deformed so that the space between the pair of pressing leg part and the insertion leg part is widened, and the locking part fixes the outer surface of the shaft part. When it passes, it returns with elastic force and bends toward the base end side of the insertion leg, and the tip of the locking part engages with the through hole, so stable and reliable mounting is possible without rattling. , While preventing the mounting body from falling off,
It can be detached only by elastically deforming the pair of legs so as to widen, and can be reused without being plastically deformed when detached.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the split pin of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a ball stud which is a shaft portion of a ball joint for an automobile, for example. The ball stud 1 has one end which can freely move in a metal-made substantially cylindrical box-shaped housing (not shown). Supported by.

A male screw portion 2 is formed on the upper portion of the ball stud 1 which is not supported by the housing. Further, the male screw portion 2 is provided with a through hole 3 in the radial direction. In addition, tapered surfaces 4a and 4b are provided at both end edges of the through hole 3 so as to expand.

Further, 6 is a castle nut as an attachment body. The castle nut 6 has an outer peripheral surface having six surfaces, and a female screw portion 7 to be screwed to the male screw portion 2 of the ball stud 1 is formed at the center. Formed into a hexagonal tubular shape. Further, on one axial end face of the castle nut 6, a plurality of notches 8 are formed radially from the center so that the diameter dimension and the width dimension of the through hole 3 are substantially the same, corresponding to each of the six faces. ing.

On the other hand, 10 is a split pin, and this split pin 10
As shown in FIGS. 1 to 3, is formed in the shape of an elongated rod whose diameter is smaller than that of the through hole, for example, made of metal or synthetic resin. Then, the split pin 10 is elastically deformable in a substantially arcuate shape so as to have a folded-back portion 11 formed around an intermediate portion which is slightly displaced to one end side. Also,
A pair of presser leg portions 12 are provided on both ends of the folded-back portion 11 so as to protrude in substantially the same direction and face each other with a predetermined gap therebetween.
A and the insertion leg portion 12b are formed.

The folded portion 11 has a diameter larger than the width dimension of the cut groove 8 of the castle nut 6 and is bent into a substantially arc shape so that it cannot be inserted into the cut groove 8.

Further, the folded-back portion 11 side, which is the base end side of the one pressing leg portion 12a, is bent in a substantially arc shape toward the side opposite to the other insertion leg portion 12b, and is a substantially L-shaped first bend. The part 13 is formed. In addition, one presser leg 12a has a first bent portion 13
The second bent portion 14 having a substantially L-shape is formed by being bent in a substantially arc shape on the side of the other insertion leg 12b located closer to the tip end side.
A holding portion 15 is provided between the first bent portion 13 and the second bent portion 14 so as to come into contact with a tip end side of a portion of the ball stud 1 which is the outer surface of the ball stud 1 to which the castle nut 6 is attached. ing.

Further, on the tip side of one of the presser leg portions 12a,
A third bent portion 16 is formed by folding back in a substantially V shape toward the other insertion leg portion 12b side and toward the base end side of the insertion leg portion 12b. A free end locking portion 17 is bent and formed on the tip side of the third bent portion 16. Also, the second
Between the bent portion 14 and the third bent portion 16, an abutting portion 18 that abuts on the tip end surface of the ball stud 1 is provided.

The contact portion 18 is formed longer than the diameter of the ball stud 1. Furthermore, the presser foot 12a
Is formed so that the tip portion of the locking portion 17 is inserted into the through hole 3 when the second bent portion 14 and the holding portion 15 contact the tip edge of the ball stud 1.

On the other hand, the folded portion which is the base end side of the insertion leg portion 12b
The eleventh side is bent in a substantially arcuate shape toward the side opposite to the one pressing leg portion 12a to form a fourth bent portion 21. Further, the insertion leg portion 12b is provided with an elastic holding portion 22 which is bent in a substantially U shape toward the contact portion 18 of the one pressing leg portion 12a. The elastic holding portion 22 is located closer to the tip end than the fourth bending portion 21 and is formed by being bent at four locations in a substantially arcuate shape to form a fifth bending portion 23, a sixth bending portion 24, and a seventh bending portion. 25 and the eighth bent portion 26.

The fourth bent portion 21 and the fifth bent portion 23
A holding portion 27 is formed between them. Further, between the fifth bent portion 23 and the sixth bent portion 24, and between the seventh bent portion 25 and the eighth bent portion 26, the tapered surfaces 4a, 4b at both end edges of the through hole 3 are formed.
Are provided with protruding portions 28a and 28b, respectively. Further, between the sixth bent portion 24 and the seventh bent portion 25, a pressure holding portion 29 that comes into contact with the inner peripheral surface of the through hole 3 is provided. The free end of the eighth bent portion 26 has an insertion portion 30 formed substantially parallel to the holding portion 27.

The elastic holding portion 22 includes the protruding portions 28a and 28b.
The pressure holding portion 29 comes into contact with the inner peripheral surface of the through hole 3 when the tape comes into contact with the tapered surfaces 4a, 4b at both ends of the through hole 3, respectively.

Further, the insertion portion 30 is formed so as to protrude from the third bent portion 16 which is the tip portion of the pressing leg portion 12a.

Next, the operation of the above embodiment will be described.

First, the male screw portion 2 of the ball stud 1 is inserted and fitted into the insertion hole of a knuckle arm (not shown).
Next, the castle nut 6 is screwed onto the male screw portion 2 protruding from the insertion hole so that the kerf 8 is located on the side where the male screw portion 2 protrudes, and the kerf 8 is substantially linear in the through hole 3 of the ball stud 1. Tighten until it connects, and attach the ball joint to the knuckle arm.

Then, the split pin 10 is attached to the pair of pressing legs 12a.
Then, the insertion leg portions 12b are positioned so as to face each other in the vertical direction, and the insertion portion 30 of the insertion leg portion 12b of the split pin 10 is inserted into the cut groove 8 of the castle nut 6 communicating with the through hole 3 of the ball stud 1. By this insertion, the longer presser foot 12a
The engaging portion 17 contacts the tip end portion of the ball stud 1, and the protruding portion 28b on the tip end side of the insertion leg portion 12b contacts the tapered surface 4a of the peripheral edge of the through hole 3.

Further, the cotter pin 10 is pushed toward the cut groove 8 so that the holding leg portion 12a on the side of the engaging portion 17 is paired with the holding leg portion 12a.
Also, the insertion leg 12b is elastically deformed so as to expand and the locking portion 17 is slid along the edge of the tip end of the ball stud 1, and the holding leg 12a is straddled over the tip end which is the outer surface of the ball stud 1. Let it go. Further, the elastic holding portion 22 of the insertion leg portion 12b inserted into the through hole 3 is elastically deformed so as to be crushed, and the elastic holding portion 22 is inserted into the through hole 3.

When the insertion leg portion 12b is further inserted into the through hole 3, the protruding portion 28a on the side of the folded portion 11 which is the base end side of the elastic holding portion 22 abuts on the tapered surface 4a of the through hole 3 and The holding portion 15 of the pressing leg portion 12a on the locking portion 17 side contacts. In this state, the split pin 10 is further pushed and further elastically deformed so that the holding portion 15 slides on the tip edge of the ball stud 1, and the fifth bent portion 23 of the other insertion leg portion 12b is tapered surface 4a.
Slide it on. By pushing in the split pin 10, the locking portion 17 passes through the tip of the ball stud 1.

When the locking portion 17 has passed the tip of the ball stud 1, the pressing leg 12a in the expanded state has its original shape toward the insertion leg 12b which is inserted into the through hole 3 by the elastic force. Then, the tip of the locking portion 17 engages with the through hole 3. When engaging the engaging portion 17 with the through hole 3, the split pin
10 moves a little in the direction to come off due to the elastic force.

By the engagement of the locking portion 17 with the through hole 3, the contact portion 18 of the pressing leg 12a on the locking portion 17 side contacts the tip surface of the ball stud 1. Further, the protruding portions 28a, 28b of the elastic holding portion 22 contact the tapered surfaces 4a, 4b of the peripheral edge of the through hole 3, respectively, and the pressing holding portion 29 of the elastic holding portion 22 contacts the inner peripheral surface of the through hole 3. Contact.

By the engagement of the locking portions 17, the split pin 10
Is prevented from coming off, the engagement of the locking portion 17 and the contact of the holding portion 15 with the ball stud 1 by the elastic force and the elastic holding portion 22.
The split pin 10 is attached without rattling due to the elastic force of.

By attaching the split pin 10,
The pressing portion 27 of the insertion leg 12b that is inserted into the through hole 3 abuts on the upper surface of the castle nut 6 in the cut groove 8, and the folded portion 11 is located below the upper end surface of the castle nut 6, so that The loosening of 6 is prevented.

On the other hand, when the split pin 10 is to be removed, the split pin 10 is moved so as to be pushed into the through hole 3 and the locking portion
Remove from 17 through hole 3. Then, the longer presser leg portion 12a is elastically deformed so as to expand from the insertion leg portion 12b which is inserted into the through hole 3, the locking portion 17 is positioned on the tip surface of the ball stud 1, and the split pin 15 is inserted. Pull out.

Therefore, the presser leg portion 12 provided with the engaging portion 17
The a is elastically deformed by straddling the tip end of the ball stud 1, the insertion leg 12b provided with the elastic holding portion 22 is inserted into the through hole 3, and the split pin 10 is easily deformed by only narrowing and pushing. It can be installed and the efficiency of installation work can be improved. Further, it is possible to easily remove the split pin 10 by simply removing the locking portion 17 that engages with the through hole 3 and elastically deforming and pulling out the split pin 10, improving disassembly and maintenance, and improving workability of assembly and removal. The serviceability can also be improved. Further, since the split pin 10 is attached and detached by elastic force without being plastically deformed, metal fatigue due to plastic deformation can be prevented, the split pin 10 can be reused, and cost can be reduced.

Further, since the engaging portion 17 is formed by folding back on the pressing leg portion 12a, the engaging portion 17 is held by the pressing portion 12a at the time of mounting.
Since it abuts on the tip end edge of the ball stud 1 so as to elastically deform in the direction of expanding, the attachment work is facilitated, and the engaging portion 17 engages the through hole 3 so that it also has a retaining function. The split pin 10 can be prevented from falling off.

Further, a holding portion for holding the tip end portion of the ball stud 1 by elastic force with the pressing leg portion 12a and the engaging portion 17.
Since 15 is provided, the split pin 10 can be attached without rattling.

Further, since the insertion leg portion 12b which is inserted into the through hole 3 is provided with the elastic holding portion 22 which is formed to be wider than the diameter dimension of the through hole 3, the elastic holding portion 22 is elastic when inserted into the through hole 3. Due to the elastic force of the deformed protrusions 28a and 28b contacting the tapered surfaces 4a and 4b of the edge of the through hole 3 respectively, and the pressure retaining portion 29 contacting the inner peripheral surface of the through hole 3, the split pin 10 is further moved. It can be installed without rattling.

Further, since the insertion portion 30 projects from the third bent portion 16 which is the tip end portion of the insertion leg portion 12a and has a rod shape in the insertion direction, it can be easily inserted into the through hole 3 and the mounting workability is further improved. Can be improved.

Further, since the folding portion 11 is located below the upper end surfaces of the elastic holding portion 22 and the castle nut 6, the rotation around the insertion leg portion 12b moves within the width dimension of the kerf 8. You can hardly rotate just by doing, split pin 10
Can be attached without rattling.

In the above embodiment, the split pin 10 is attached to the ball stud 1 of the ball joint, and the castle nut 6 is screwed to the ball stud 1.
However, not only the ball joint but also the castle nut 6 may be used, and an attachment body such as a normal nut having no cut groove 8 may be attached to a shaft portion such as a bolt having the male screw portion 2.

Further, the pressing leg portion 12a provided with the engaging portion 17 is attached so as to straddle the tip end portion of the ball stud 1 as the shaft portion, but it may be straddled in the circumferential direction of the ball stud 1. In this case, the contact portion 18 is formed in an arc shape.

A split pin having a structure not having the holding portion 15 or a split pin having a structure not having the elastic holding portion 22 can be used.

Further, although the abutment portion 18 is provided on the presser leg portion 12a in the above description, even if the abutment portion 18 is not provided, the fold pin 11 can prevent the cotter pin 10 from rotating as described above. The cotter pin 10 can be attached without sticking.

[0045]

According to the split pin of the first aspect of the present invention, while the insertion leg portion is inserted into the through hole of the shaft portion, the pressing leg portion is elastically deformed so as to straddle the outer surface of the shaft portion, and the locking portion is formed. When it passes through the outer surface of the shaft, it returns by elastic force and the tip of the locking part is inserted into the through hole and engages, so that the locking part bends in the direction opposite to the insertion direction into the through hole. Since it can be easily mounted, it can be securely attached and held, the attachment body can be prevented from falling off, and it can be removed simply by elastically deforming the pair of presser legs and insertion legs so that the composition is not deformed when attaching or detaching. Can be reused without.

According to the split pin of the second aspect, in addition to the split pin of the first aspect, a holding portion that bends in the bending direction of the engaging portion on the presser leg portion is engaged with the tip portion of the shaft portion. Since the outer surface of the shaft part is clamped and fixed by the locking part and the holding part, stable mounting can be done easily and it can be securely attached and held to prevent the mounting body from falling off, and the pair of presser legs and insertion It can be removed by simply elastically deforming the legs so that it can be reused without deformation during composition.

According to the split pin of the third aspect, in addition to the split pin of the first or second aspect, while elastically deforming the elastic holding portion that is bent wider than the diameter dimension of the through hole, the elastic holding portion is elastically deformed. Since the legs are inserted into the through holes, stable and reliable mounting can be performed easily without rattling, the mounting body can be prevented from falling off, and the pair of presser legs and the insertion legs are elastic so as to expand. It can be easily removed simply by deforming it, and can be reused without being deformed when the composition is attached or removed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a state in which a split pin according to an embodiment of the present invention is attached to a ball stud.

FIG. 2 is a plan view of the same.

FIG. 3 is a front view showing the same split pin.

FIG. 4 is a front view showing a conventional split pin.

FIG. 5 is a plan view showing a situation in which the above split pin is attached to a ball stud.

FIG. 6 is a plan view showing another situation in which the above cotter pin is attached to the ball stud.

[Explanation of symbols]

 1 Ball stud as shaft part 3 Through hole 6 Castle nut as mounting body 10 Split pin 11 Folding part 12a Holding leg part 12b Insertion leg part 15 Holding part 17 Locking part 22 Elastic holding part

Claims (3)

[Claims] 1. A fold-back portion which is formed by folding back to one end side and which is locked to one end side of a through hole which is bored in a radial direction of a shaft portion to which a mounting body is attached, and an extending portion from one end portion of this fold-back portion. An insertion leg portion that is inserted into the through hole, and a pressing leg portion that extends from the other end of the folded portion in substantially the same direction as the insertion leg portion and at least a portion of which contacts the outer surface of the shaft portion. And a locking portion that is formed by bending toward the base end side of the insertion leg portion at the tip end portion of the pressing leg portion, and has a tip end that is locked to the other end side of the through hole. Characteristic split pin. 2. The presser leg portion is bent in a direction in which the locking portion is bent between the locking portion and the folding portion, and the outer surface of the shaft portion is elastically clamped and fixed by the locking portion. The split pin according to claim 1, further comprising a holding portion. 3. An elastic holding portion in which the insertion leg portion is bent wider than the diameter dimension of the through hole and elastically deforms when the insertion leg portion is inserted into the through hole so that the bending width dimension is narrowed. The split pin according to claim 1, wherein the split pin is provided.