JPH0716016U - Split pin - Google Patents

Abstract

(57) [Summary] [Configuration] Push the split pin 15 into the kerf 13 side
The locking portion 18 is elastically deformed toward the longer leg portion 17 side at the edge of 13 and the locking portion 18 is inserted into the cut groove 13. The folded portion 16 is elastically deformed to narrow the gap between the leg portions 17 and 17, and the leg portion 17 is inserted into the cut groove 13 while inserting the locking portion 18 into the through hole 7. The folded-back portion 16 is further pushed while elastically deforming at the edge of the kerf 13, so that the through hole 7
The locking portion 18 that has passed through is returned by elastic force. Folding part 16
Is released, and the tip of the locking portion 18 is brought into contact with the outer surface of the castle nut 11. The elastic portions of the folded-back portion 16 and the locking portion 18 pull the other side of each other, and the split pin 15 is attached without rattling. The folded portion 16 is pushed into the cut groove 13 side, the locking portion 18 is elastically deformed to the leg portions 17 and 17 side and inserted into the cut groove 13, the folded portion 16 is pulled, and the split pin 15 is pulled out. [Effect] The split pin 15 can be easily attached and detached, and the workability of assembling and dismounting and the serviceability can be improved. The split pin 15 can be reused, and the cost can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a split pin that prevents a mounting body attached to a shaft portion from falling off.

[0002]

[Prior art]

 Conventionally, as this type of split pin, for example, the structure shown in FIGS. 9 to 11 is known.

The split pin 40 shown in FIG. 9 to FIG. 11 is a metal-made elongated rod-shaped member, and a middle portion is folded back in an arc shape to form a folded portion 41. From this folded portion 41, a leg portion 42 is formed in the same direction. Abutting and extending toward.

On the other hand, in FIG. 11, reference numeral 44 denotes a ball joint, which has a male screw portion 46 formed at the upper end of a ball stud 45 of the ball joint 44, and a through hole 47 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 radially formed from the center on one end face thereof.

Then, the upper end of the ball stud 45 is inserted into, for example, the insertion hole 53 of the knuckle arm 52, and the male nut portion 46 of the ball stud 45 protruding from the insertion hole 53 is cut into the through hole 47 of the castle nut 49. Rotate and screw in until it is in linear communication with 50. Thereafter, the leg portion 42 of the split pin 40 is inserted until the folded-back portion 41 contacts the peripheral edge of the cut groove 50 communicating with the through hole 47, and the tip of the leg portion 42 protruding from the cut groove 50 through the through hole 47. 9 is plastically deformed along the outer peripheral surface of the castle nut 49 and bent by using a jig such as pliers (not shown) to prevent the castle nut 49 from falling off.

[0006]

However, since the cotter pin 40 having the conventional structure shown in FIGS. 9 to 11 is plastically bent by using a jig such as pliers (not shown), the cotter pin 40 can be mounted. The work is complicated and there is a problem that the split pin 40 rattles depending on the bent state of the legs 42.

Further, when the ball joint 44 is disassembled and maintained, the plastically bent leg portion 42 of the split pin 40 is bent again so that it can be inserted into the through hole 47 and the cut groove 50, and the folded portion 41 is pliers. Since the leg nut 42 of the split pin 40 that has been pulled out is complicatedly deformed because it is pulled out with a jig or the like and the castle nut 49 is removed and disassembled, the leg hole 42 and the kerf 50 are re-assembled when reassembling. In addition to being difficult to insert, there is a problem that metal fatigue is caused by plastic bending, reuse is not possible, and cost reduction is also constrained.

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 that is easily removable and can be reused.

[0009]

[Means for Solving the Problems]

 The split pin of the present invention includes a folded-back portion formed by folding back one end side into a substantially arc shape, a pair of leg portions extending from the folded-back portion to the other end side, and a tip end side of the leg portion. The leg portion is inserted into a through hole bored in the radial direction of the shaft portion, one end side of the through hole is the folding portion, and the other end is the locking portion. In a split pin that is locked and prevents the attachment body attached to the shaft part from falling off, the locking part is formed on at least one of the leg parts, and at least one of the folding part and the locking part. When elastically deformed, it can be inserted into the through hole, and in a normal state, it protrudes in the radial direction from the through hole and biases the folded portion inward of the through hole.

[0010]

[Action]

 The cotter pin of the present invention, after the mounting body is attached to the shaft portion, is elastically deformed to a diameter smaller than the inner diameter of the through hole and inserted into the through hole, and the locking portion projects out of the through hole. The stop part returns and becomes larger than the diameter of the through hole and locks the other end side, the folded part locks one end side of the through hole, and the locking part moves toward the other end side of the through hole. Since the cotter pin can be inserted into the through hole in one operation, the cotter pin does not rattle or fall out, and the locking part is pressed to elastically deform to a smaller diameter than the through hole. By doing so, since the locking portion can be inserted into the through hole and removed, there is no plastic deformation at the time of attachment / detachment, and the split pin can be reused.

[0011]

【Example】

 An embodiment of the split pin of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 4, reference numeral 1 is a ball joint for an automobile, and this ball joint 1 includes a substantially cylindrical box-shaped housing 2 made of metal and a cylindrical ball stud 3 made of metal as a shaft portion. And one end of the ball stud 3 is allowed to float and the other end is pivotally supported in the housing 2. A flexible dust-proof cover 4 is attached to the joint between the housing 2 and the ball stud 3.

A male screw portion 6 is formed on the upper portion of the ball stud 3, and a through hole 7 is bored in the male screw portion 6 in the radial direction. Further, a conical fitting part 8 is formed on the base end side of the male screw part 6 of the ball stud 3, and the insertion hole 10 is formed so as to expand to one end side of the knuckle arm 9. It is designed to be fitted.

Reference numeral 11 denotes a castle nut as a mounting body. The castle nut 11 has an outer peripheral surface having six surfaces, and a female screw portion 12 screwed to the male screw portion 6 of the ball stud 3 is formed at the center. Formed into a hexagonal tubular shape. Further, on one end face in the axial direction of the castle nut 11, a plurality of notches 13 are formed radially from the center so as to correspond to each of the six faces.

On the other hand, 15 is a split pin, and this split pin 15 is formed in the shape of an elongated rod made of metal or synthetic resin, for example. Then, the split pin 15 is folded back in a circular arc shape so as to be elastically deformable around an intermediate portion which is slightly displaced to one end side, and a folded portion 16 is formed, and both ends of the folded pin 16 are directed in substantially the same direction. So as to project linearly, leg portions 17, 17 are formed facing each other with a predetermined gap.

The folded-back portion 16 has a diameter larger than the width dimension of the cut groove 13 of the castle nut 11 and is bent in an arc shape so that it cannot be inserted into the cut groove 13, and the outer dimension between the leg portions 17 and 17 is It is bent and formed so as to have a diameter equal to or larger than the diameter of the through hole 7 of the ball stud 3 and the width dimension of the kerf 13 of the castle nut 11.

Further, at the tip of one of the longer leg portions 17, toward the other short leg portion 17 side, and toward the outer diameter side in the axial direction from the shorter leg portion 17, The locking portion 18 is bent back in a substantially V shape so as to be elastically deformable. The distance between the tip of the locking portion 18 and the base end of the longer leg 17 on the folded-back portion 16 side is equal to or less than the distance between the facing surfaces of the castle nut 11. Is bent so that

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

The male screw portion 6 of the ball stud 3 is inserted into the insertion hole 10 of the knuckle arm 9 to fit the fitting portion 8. Next, a castle nut 11 is screwed onto the male screw portion 6 projecting from the insertion hole 10 so that the kerf 13 is located on the side where the male screw portion 6 projects, and the kerf 13 is linearly fitted in the through hole of the ball stud 3. Tighten until it communicates with, and attach the ball joint 1 to the knuckle arm 9.

Then, the bent tip portion of the engaging portion 18 of the split pin 15 is inserted into the cut groove 13 of the castle nut 11 which communicates with the through hole 7 of the ball stud 3. Further, push the split pin 15 toward the cut groove 13, and at the edge of the cut groove 13 on the outer surface side of the castle nut 11, move the lock portion 18 to the longer leg 17 side and set the maximum diameter of the lock portion 18. The engaging portion 18 is inserted into the cut groove 13 by elastically deforming by pressing at an acute angle smaller than the inner diameter of the through hole 17.

Next, the legs 17 are elastically deformed so as to narrow the gap between them, the split pin 15 is further pushed into the cut groove 13 side, and the locking portion 18 is inserted into the through hole 7, while the legs are further extended. Insert 17 into kerf 13. Then, the split pin 15 is inserted until the outer peripheral surface of the folded portion 16 comes into contact with the edge of the outer surface of the castle nut 11 of the cut groove 13.

Further, the split pin 15 is pushed further toward the kerf 13 side while the folded portion 16 is elastically deformed, and the locking portion 18 that has passed through the through hole 7 is returned so as to be expanded by elastic force. Then, the pushing back of the folding portion 16 is released, the split pin 15 is moved to the folding portion 16 side by the elastic force of the folding portion 16, the tip of the locking portion 18 abuts the outer surface of the castle nut 11, and the cut groove is formed. The castle nut 11 is sandwiched so as to pull the other side by the folded-back portion 16 contacting the edge of the 13 and the locking portion 18 contacting the outer surface of the castle nut 11. Further, the outer surface of the leg portion 17 is pressed and abutted against the inner surface of the through hole 7 and the cut groove 13 by the elastic force of expanding the space between the leg portions 17 of the folding portion 16.

The elastic force of the locking portion 18 and the folding portion 16 allows the split pin 15 to be attached without rattling.

Further, when the split pin 15 is removed, the folded portion 16 is once pushed into the cut groove 13 side, and the locking portion 18 is pressed toward the longer leg portion 17 side at an acute angle to elastically move. It is deformed, the diameter of the engaging portion 18 is made narrower than the inner diameter of the through hole 17, and the engaging portion 18 is inserted into the kerf 13.

Therefore, the split pin 15 can be easily attached by only elastic deformation in which the space between the leg portions 17, 17 is narrowed and pushed, and the efficiency of the attachment work can be improved. Further, it is possible to easily remove the split pin 15 only by pulling out the split pin 15 while elastically deforming the locking portion 18, improving disassembly and maintenance, improving workability of assembly and removal, and improving serviceability. Furthermore, since the split pin 15 is attached and detached by elastic force without being plastically deformed, metal fatigue due to plastic deformation can be prevented, the split pin 15 can be reused, and the cost can be reduced.

Further, since the outer dimension between the leg portions 17 is formed to be equal to or larger than the diameter of the through hole 7 of the ball stud 3 and the width dimension of the kerf 13 of the castle nut 11, the leg portion 17 is formed. Is pressed against the inner surface of the through hole 7 and the inner surface of the groove 13 of the castle nut 11 by the elastic force of the folded portion 16, so that this contact and the elastic force of the locking portion 18 and the folded portion 16 cause the castle nut. By sandwiching 11, the split pin 15 can be attached without rattling.

Next, a description will be given with reference to another embodiment.

In FIG. 5, reference numeral 3 designates a ball stud. As in the embodiment shown in FIGS. 1 to 4, a male nut 6 of this ball stud 3 is screwed with a castle nut 11.

Further, in FIGS. 5 to 7, reference numeral 21 is a split pin, and the split pin 21 is formed in a slender rod shape with a metal or a synthetic resin.

Then, like the split pin 15 of the embodiment shown in FIGS. 1 to 4, the split pin 21 is elastically deformed in a circular arc shape at a substantially central portion to form a folded portion 22, and the folded portion 22 is formed. Leg portions 23, 23 are formed facing each other with a predetermined gap so that both ends of the return portion 22 linearly protrude in the substantially same direction.

The folded portion 22 has a diameter larger than the width dimension of the cut groove 13 of the castle nut 11 and is bent in an arc shape so that it cannot be inserted into the cut groove 13. The outer dimension between the leg portions 23, 23 is It is formed so as to have a diameter equal to or larger than the diameter of the through hole 7 of the ball stud 3 and the width dimension of the kerf 13 of the castle nut 11.

Further, substantially leg-shaped locking portions 24 facing each other with a predetermined gap are formed at both ends of the leg portions 23, 23, and these locking portions 24, 24 are formed in a dog-legged shape. The maximum diameter of the apex 24a is formed approximately at the center of the apex 24a. It has become easy to take off.

In the locking portion 24, the outermost distance between the V-shaped top portions 24 a, 24 a is larger than the width dimension of the kerf 13 of the castle nut 11, and the base end and the folded portion 22 of the locking portion 24. It is formed so that the length dimension of the linear leg portion 23 therebetween is equal to or less than the distance between the facing surfaces of the castle nut 11.

Next, the operation of the embodiment shown in FIGS. 5 to 7 will be described.

First, similarly to the embodiment shown in FIGS. 1 to 4, a castle nut 11 is screwed onto the male screw portion 6 of the ball stud 3 so that the cut groove 13 linearly communicates with the through hole 7 of the ball stud 3. Tighten until

Then, the opposite ends of the engaging portions 24 of the split pin 21 are inserted into the cut grooves 13 of the castle nut 11 communicating with the through holes 7 of the ball stud 3. Next, the split pin 21 is pushed toward the cut groove 13, and the folded portion 22 is elastically deformed at the edge of the cut groove 13 on the outer surface side of the castle nut 11 so as to reduce the distance between the legs 23. At the same time, the tips of the engaging portions 24, 24 are brought into contact with each other to make a bid, and the top portions 24a, 24a of the engaging portions 24 are pressed against each other so as to narrow the distance between them, and are brought into a linear shape to be elastically deformed. Insert the locking portion 24 into the cut groove 13.

Further, when the split pin 21 is pushed in and the dogleg-shaped top portion 24a of the locking portion 24 passes through the kerf 13 of the castle nut 11, the return portion 22 and the locking portion 24 are about to return. Due to the elastic force, the space between the leg portions 23 and 23 and between the locking portions 24 and 24 is opened.

Then, the outer surface of the inclined portion 24c of the locking portion 24 abuts on the outer side edge of the cut groove 13 of the castle nut 11, and the outer peripheral surface of the folded portion 22 is located outside the cut groove 13 of the castle nut 11. The castle nut 11 is abutted against the edge on the surface side and is urged in the direction in which the other side is pulled so that the castle nut 11 is sandwiched between the locking portion 24 and the folded portion 22. Further, the outer surface of the leg portion 23 is pressed and brought into contact with the inner surface of the through hole 7 and the kerf 13 by the elastic force of expanding the space between the leg portions 23, 23 of the folded portion 22.

The elastic force of the engaging portion 24 and the folded portion 22 allows the split pin 21 to be attached without rattling.

When the split pin 21 is removed, the folded portion 22 is pulled to elastically deform the folded portion 22 so as to reduce the distance between the legs 23, 23, and the tip between the locking portions 24, 24 is also changed. Are abutted against each other and abutted against each other so that the distance between the tops 24a, 24a of the locking portions 24 is narrowed and elastically deformed so that the locking portions 24 pass through the kerf 13 and the through hole 7. Then, pull out the split pin 21.

Therefore, it is possible to easily attach and detach by simply pushing in and pulling out the split pin 21, and it is possible to improve mounting workability, disassembly and maintenance, and serviceability. Further, since the split pin 21 is attached and detached by elastic force without being plastically deformed, metal fatigue due to plastic deformation can be prevented, the split pin 21 can be reused, and the cost can be reduced.

Further, since the outer dimension between the leg portions 23, 23 is formed to be equal to or larger than the diameter of the through hole 7 of the ball stud 3 and the width dimension of the kerf 13 of the castle nut 11, the leg portion 23 is formed. Is pressed against the inner surface of the through hole 7 and the inner surface of the groove 13 of the castle nut 11 by the elastic force of the folded portion 22, so that the contact and the elastic force of the locking portion 24 and the folded portion 22 cause the castle nut. By sandwiching 11, the split pin 21 can be attached without rattling.

Next, still another embodiment will be described with reference to FIG.

The split pin 31 of the embodiment shown in FIG. 8 is formed in the shape of an elongated rod made of, for example, metal or synthetic resin, as in the embodiment shown in FIGS. 5 to 7.

The split pin 31 has the same shape as the split pin 21 of the embodiment shown in FIGS. 5 to 7, an arcuate folded-back portion 22, a straight leg portion (not shown), and a dogleg-shaped locking. The portions 24 are formed, and the locking portions 24 are formed so as to be staggered, as shown in FIG.

Further, the split pin 31 can be attached and detached only by pushing in and pulling out, as in the split pin 21 of the embodiment shown in FIGS. 5 to 7.

At the time of this attachment and detachment, the folded-back portion 22 is elastically deformed so that the distance between the legs is shortened, and the locking portion 24 has its tip abutted as in the embodiment shown in FIGS. 5 to 7. There is no bidding in contact with each other, and they are staggered in parallel so that they intersect. Therefore, the ball stud 3 can be inserted into the through hole 7 more easily.

In the embodiment shown in FIGS. 1 to 4, the embodiment shown in FIGS. 5 to 7, and the embodiment shown in FIG. 8, the split pins 15, 21, 31 are attached to the ball stud 3 of the ball joint 1. We have explained how to prevent the castle nut 11 from being attached and screwed to the ball stud 3. However, not only the ball joint 1 but also the castle nut 11 is not used, but a normal nut having no kerf 13 is attached to the male screw portion 6. It can also be attached to the shaft.

In this case, the engaging portions 18, 24 and the folded portions 16, 22 are brought into contact with the peripheral edge of the through hole 7 by a competition due to elastic force, and the split pins 15, 21, 31 are rattled. The nuts are attached without contact, and the end faces of the nuts come into contact with the folded portions 16 and 22 and the locking portions 18 and 24 protruding from the through hole 7 to prevent the nuts from falling off.

[0050] Further, without using the shaft portion having the male screw portion 6 and the nut, for example, the split pins 15, 21, 31 are attached to the rod-shaped shaft portion so that the annular and tubular mounting bodies do not fall off. But you can.

[0051]

[Effect of device]

 According to the split pin of the present invention, the locking portion is elastically deformed to a diameter smaller than the inner diameter of the through hole and inserted into the through hole, the folding portion locks one end side of the through hole, and the locking portion causes the folding portion. Since the biasing force is applied toward the other end of the through hole, the cotter pin can be inserted into the through hole in one operation, and the cotter pin does not rattle or fall out. By elastically deforming to a diameter smaller than the through hole, the locking part can be inserted and removed inside the through hole, so there is no plastic deformation when attaching or detaching, so the cotter pin can be reused. it can.

[Brief description of drawings]

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

FIG. 2 is a plan view showing the same split pin.

FIG. 3 is a front view of the same.

FIG. 4 is a partially cutaway side view showing a situation where the ball stud is attached to the same.

FIG. 5 is a plan view in which a part of the situation in which the cotter pin is attached to a ball stud showing another embodiment is cut away.

FIG. 6 is a plan view showing the same split pin.

FIG. 7 is a front view of the same.

FIG. 8 is a front view showing still another embodiment of the same split pin.

FIG. 9 is a plan view in which a part of a state in which the cotter pin of the conventional example is attached to a ball stud is cut away.

FIG. 10 is a plan view showing the same cotter pin.

FIG. 11 is a partially cutaway side view showing a situation in which the ball stud is attached to the same.

[Explanation of symbols]

 3 Ball stud as shaft 7 Through hole 11 Castle nut as mount 15,21,31 Split pin 16,22 Folding part 17,23 Leg part 18,24 Locking part

Claims (1)

[Scope of utility model registration request] 1. A folded-back portion formed by folding back one end into a substantially arcuate shape, a pair of legs extending from the folded-back portion to the other end, and a distal end of the leg. The leg portion is inserted into a through hole that is bored in the radial direction of the shaft portion, one end side of the through hole is the folded portion, and the other end is the lock portion. In the split pin for preventing the attachment body attached to the shaft portion from falling off, the locking portion is formed on at least one of the leg portions,
The elastic member can be inserted into the through hole when at least one of the folded portion and the locking portion is elastically deformed, and normally projects in the radial direction from the through hole and biases the folded portion inward of the through hole. Split pin characterized by that.