JPH09196035A - Structure for connecting two members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the connecting structure, which can easily connect and disconnect two members without deforming the parts. SOLUTION: One of two members to be interlocked with each other is provided with a receiver piece 2 having a fitting hole 21, and the other of the two members is provided with a pin shaft 3 having an enlarged head part larger than the diameter of the fitting hole 21, and the pin shaft 3 is inserted in the fitting hole 21 in the condition that the enlarged head part of the pin shaft 3 is passed through the fitting hole 21 so as to prevent a loose-out thereof. In this connecting structure, a central part of the pin shaft 3 is provided with a split groove extended to the base end direction of the pin shaft from the tip of the enlarged head part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where two members that move relative to each other, for example, one member performs a linear motion and the motion is converted into a rotational motion of the other member through a connecting portion. The present invention relates to the structure of a connecting portion that connects these members.

[0002]

2. Description of the Related Art For example, when an engine intake control valve of an automobile is opened and closed by a diaphragm type actuator that responds to a negative pressure of an intake manifold, the movement of a diaphragm rod that moves linearly according to the displacement of the diaphragm is connected via a connecting portion. Is converted into rotational movement of the rotating shaft.

At this time, as one of means for connecting the diaphragm rod and the rotary shaft, as shown in FIG. 4, a receiving portion piece 52 made of synthetic resin having a mounting hole 60 at the tip of the diaphragm rod 56 is formed by the insert molding method. And the metal pin shaft 53 provided at the tip of the arm 54 of the rotary shaft 55 is inserted into the mounting hole 60. That is, the shaft portion 62 of the pin shaft 53 has a smaller diameter than the mounting hole 60, and an enlarged head portion 61 having a larger diameter than the mounting hole 60 is provided at the tip of the pin shaft 53. By elastically deforming the receiving portion piece 52, the receiving portion piece 52 passes through the mounting hole 60, and after the passage, the receiving portion piece 52 returns to its original shape, so that the pin shaft 53 is inserted so as not to come off easily. Become. The mounting hole 60 has a semicircular cross section whose peripheral surface bulges toward the center as shown in FIG. 5 so that it can be passed again when the enlarged head portion 61 is pushed with a strong force.

In this manner, the connecting portion between the linearly moving member and the rotating member is repeatedly attached and detached in consideration of workability of assembly in mass production and workability of replacement in the case of breakage. It is structured so that work can be performed.

However, due to deterioration over time, or thermal deterioration due to the heat of the engine when used as a part of an automobile, the receiving part 52 made of synthetic resin is hardened and its elasticity is lowered, and expansion occurs. Even if the head portion 61 is pushed, the mounting hole 60 may not spread easily. Therefore, if the enlarged head 61 is forcibly pushed in and the pin shaft 53 is pulled out from the mounting hole 60 when the actuator 57 is damaged and needs to be replaced, a large force is applied to the arm 54 and the rotary shaft 55, Since it is deformed, there has been a problem in that the rotating parts also have to be replaced.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention is to provide a connecting structure in which the pin shaft can be easily repeatedly attached and detached without deforming the parts even if the receiving piece loses elasticity due to deterioration or the like. It is what

[0007]

That is, of two members that move relative to each other, one member is provided with a receiving portion piece having a mounting hole, and the other member is an enlarged head having a diameter larger than that of the mounting hole. In a connecting structure in which a pin shaft having a portion is provided, and the pin shaft is inserted into the mounting hole in a state where the pin shaft passes through the expansion head and does not come out easily, The structure is such that a split groove extending in the end direction is provided.

At the time of assembly, if the tip of the enlarged head is inserted into the attachment hole, the receiving piece is deformed to widen the opening, or the split groove is closed to reduce the outer diameter of the enlarged head and easily pass through. be able to. Further, at the time of repair or replacement, if the outer diameter is reduced by closing the split groove with the enlarged head in between, the pin shaft can be pulled out without giving a large force to the parts.

Further, if the outer diameter of the tip of the enlarged head in a state where the split groove is opened is set to be slightly smaller than the mounting hole, the insertion into the mounting hole becomes easier.

[0010]

1 and 2 show an embodiment of the present invention.
A description will be given based on FIG.

The diaphragm rod 6 attached to the diaphragm of the diaphragm type actuator 7 is provided with a receiving portion piece 2 having a mounting hole 21 at the tip thereof, and the diaphragm rod 6 moves linearly in the axial direction.

The receiving piece 2 is made of synthetic resin, and has a mounting hole 21 having a uniform diameter on the central axis as shown in FIG. The diaphragm rod 6 is sandwiched and fixed in an annular groove 22 which is open to the outside.

On the other hand, in the rotating member, the rotating shaft 5 and the pin shaft 3 are connected by the arm 4. The pin shaft 3 is made of metal, and as shown in FIG.
The arm 4 is fixed by sandwiching the tip of the arm 4 in an annular groove 34 sandwiched between two flanges 33, 35 provided at the base end. The enlarged head 31 has a truncated cone shape, and a split groove 36 formed by slitting extends from the center of the enlarged head 31 to the vicinity of the base end of the pin shaft. The enlarged head 31 has a tip diameter equal to or slightly smaller than the mounting hole 21,
The base diameter is larger than the mounting hole 21. Then, when a force is applied to the enlarged head 31 to close the split groove 36, the maximum diameter of the base end of the enlarged head 31 is equal to the mounting hole 2
It is made to be equal to or slightly smaller than 1.
Further, the shaft portion 32 has a diameter slightly smaller than that of the mounting hole 21.

When the pin shaft 3 is attached to the attachment hole 21, the tip of the enlarged head 31 is inserted into the attachment hole 21 and the pin shaft 3 is pushed in, so that the enlarged head 31 is inserted into the attachment hole 21 along the inclination of the outer periphery. It is inserted, the split groove 36 is closed, and the split groove 36 passes through the mounting hole 21. When the base end of the expansion head 31 has finished passing through the mounting hole 21, the split groove 36 reopens, and the expansion head 31 plays a role of preventing the expansion head 31 from coming off easily even if a pulling force acts. It should be noted that when the split groove 36 is closed, the receiving portion piece 2 passes through the enlarged head portion 31 with little or almost no deformation, but the receiving portion piece 2 has sufficient elasticity and the pin shaft 3 When elastically deformed by a force smaller than the spring force that tries to close the split groove 36, the mounting head 21 expands so that the enlarged head portion 31 passes. In this case, when the enlarged head portion 31 has finished passing through the mounting hole 21, the mounting hole 21 returns to the original diameter, so that the pin shaft 3 is inserted and held by the enlarged head portion 31 so that it cannot be easily pulled out. It will be.

On the other hand, when the pin shaft 3 is to be removed for repair or replacement, the maximum diameter of the enlarged head 31 can be increased by pinching the tip of the enlarged head 31 with a pincer such as pliers and closing the split groove 36. Since it is equal to or smaller than the mounting hole 21, the pin shaft 3 can be pulled out from the receiving piece 2 without applying a large force to the mounting hole 21.

Therefore, according to the present invention, even if the receiving piece 2 is deteriorated and the elastic force is lost, the pin shaft 3 can be repeatedly attached and detached without any influence. Further, since the receiving portion piece 2 may be made of a non-elastic metal or the like, the diaphragm rod 6 and the receiving portion piece 2 can be integrally formed.

Since it is not necessary to force the receiving portion piece 2 to be deformed when the pin shaft 3 is attached or detached, the material of the pin shaft 3 may be softer than the receiving portion piece 2, such as synthetic resin.

Further, although the structure of the connecting portion for converting the linear movement into the rotational movement has been described in the above-mentioned embodiment, the present invention is directed to the case where the two members both perform the linear movement or both of them perform the rotational movement. The same can be applied to either of the connecting portions in the case.

[0019]

According to the present invention, the pin shaft can be easily inserted into and removed from the mounting hole with a small force, so that no unreasonable force is applied to the parts such as the arm and the rotary shaft, and therefore the attachment and detachment is possible. Sometimes does not damage the parts.

Further, since the receiving part can be attached and detached without being deformed, even if the receiving part is made of synthetic resin and the elastic force is lowered due to deterioration, it can be repeatedly attached and removed without any problem. Is.

Since it is not necessary to forcibly deform the receiving part piece at the time of attachment / detachment, the material of the receiving part piece may be one having no elastic force such as metal, and the material of the pin shaft is synthetic resin. Since the material may be softer than the receiving portion piece, the selection range of each material and molding method is widened.

Further, since the mounting hole does not have to have a complicated shape as in the conventional case, and the through hole having a uniform diameter may be used, the receiving part piece can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view at the time of assembly of FIG.

3 is a perspective view of a pin shaft used in FIG. 1. FIG.

FIG. 4 is an exploded perspective view showing a conventional example.

5 is a vertical cross-sectional view at the time of assembly of FIG.

[Explanation of symbols]

 2 Receiving member 3 Pin shaft 21 Mounting hole 31 Enlarged head 36 Split groove

Claims (2)

[Claims] 1. A pin shaft, of two members that move with respect to each other, one member having a receiving portion piece having a mounting hole and the other member having an enlarged head having a diameter larger than that of the mounting hole. In a connecting structure in which the pin shaft is inserted into the mounting hole in a state where the pin shaft passes through the enlarged head and does not come out easily, in the center of the pin shaft, from the tip of the enlarged head to the base of the pin shaft. A two-member connection structure characterized in that a split groove extending in the end direction is provided. 2. The two-member connecting structure according to claim 1, wherein the enlarged head is formed in a truncated cone shape having a tip diameter smaller than that of the mounting hole.