JP2000088024A - Arranging structure for coil spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent hooks at vertical outer circumferential parts passing a center of a penetrating hole by opening an air ventilation groove to one part of an outer periphery of the penetrating hole excepting a buckling direction when a coil spring is expanded and contracted. SOLUTION: An air ventilation groove 7A opened perpendicularly to a penetrating hole 2, is opened to parts of vertical outer peripheral surfaces P1, P2 with respect to a center of the penetrating hole 2, and to a right outer peripheral surface of the penetrating hole 2 excepting its left outer peripheral surface. Even if the air ventilation groove 7a is opened to only the right outer peripheral surface, a good air ventilation effect is obtained. When a folk rod is moved in vertical directions and a coil spring 3 is expanded and contracted while generating buckling in the penetrating hole 2 in the vertical directions, the air ventilation groove is not formed on the outer peripheral surfaces P1, P2. As a result, the coil spring 3 is not hooked at those positions. It is thus possible to provide a good operability in which a hook feeling is not generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for disposing a coil spring.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
Through hole 2 formed substantially horizontally through transmission case 1
A coil spring 3 is provided in the interior of the coil spring 3 so as to be extendable and retractable, a pressing bolt 4 is screwed into the through hole 2 from the left end side, and a ball 5 at the other end of the coil spring 3 is engaged with an engaging portion formed on a fork rod 6. 6a, a vent groove 7 is opened in a vertical direction perpendicular to the through hole 2. In such a structure, the fork rod 6 moves in the vertical direction indicated by the arrow at the time of shifting. At this time, the coil spring 3 expands and contracts in the through hole 2 while generating a zigzag in the vertical direction. In this case, conventionally, as shown in the sectional view along the line AA in FIG.
Is opened to the entire outer periphery of the through hole 2, so that when the coil spring 3 contracts in the up and down direction when the coil spring 3 contracts, the coil spring 3 becomes the upper and lower outer periphery passing through the center of the through hole 2 as indicated by points P1 and P2. There is a problem in that a snag occurs at a part, which causes a sense of snagging during a shift operation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an arrangement structure of a coil spring which does not cause a feeling of being caught during operation. The gist of the present invention is to provide a structure in which a coil spring is provided in a through hole so as to be extendable and contractable, and a vent groove is opened at right angles to the through hole. That is, an opening is provided in a part of the outer periphery of the through hole except for the direction.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment.
Shows a cross section taken along the line AA in FIG.
In this example, the vent groove 7 opened at a right angle to the through hole 2.
A, the upper and lower outer peripheral surfaces P1, P2 with respect to the center of the through hole 2
And the opening on the right outer peripheral surface of the through-hole 2 excluding the portion and the left outer peripheral surface thereof. Even if the venting groove 7A is opened only on the right outer peripheral surface, a good air releasing effect can be obtained. 6, the fork rod 6 moves up and down as shown in FIG. 6. At this time, when the coil spring 3 expands and contracts in the through hole 2 while creating a zigzag in the up and down direction, the fork rod 6 Since the air vent groove is not formed, the coil spring 3 does not get caught in the portions of P1 and P2 as in the related art, and good operability without causing a feeling of being caught can be obtained.

FIG. 2 shows a second embodiment. In FIG. 2, the vent groove is opened only in the upper part of the outer peripheral surface on the right side of the through hole 2, as shown in FIG. When the coil spring 3 expands and contracts in the through-hole 2 due to the vertical movement of the fork rod 6, the coil spring 3 also sets P1, At the point of P2, it comes into contact with the inner peripheral surface of the through-hole 2. However, since the air vent groove 7B is not opened at the positions of P1 and P2, the coil spring 3 is not caught and good operation during shifting is performed. Property is obtained.

FIG. 3 shows a third embodiment. In FIG. 3, a center portion 1a is left on the outer periphery of the through hole 2 at the positions P1 and P2, and side surfaces are formed on the left and right sides. The vent grooves 7C, 7C are opened. Even when the vent groove 7C is opened, even if the coil spring 3 expands and contracts in the through hole 2 and a zigzag occurs in the vertical direction, Since the air vent groove 7C is not opened at the portions P1 and P2, the coil spring 3 is satisfactorily abutted on the inner peripheral surface of the through hole 2 at this portion, so that the catch does not occur as in the related art.

FIG. 4 shows a fourth embodiment. In FIG. 4, a transmission case 1 is formed so as to penetrate a transversely venting groove 7D passing through the center of the through hole 2 in the lateral direction. This lateral hole-shaped vent groove 7D can be integrally formed in a cast-out shape when the transmission case 1 is formed with a mold, and can be easily formed as a drill hole later using a drill. Things. Even when such a horizontal hole-shaped air vent groove 7D is formed, the upper and lower portions of P1 and P2 in the rough direction of the coil spring 3 are not opened, so that the coil spring 3 expands and contracts in the through hole 2. When contacting the inner peripheral surface at the points P1 and P2,
The conventional hooking does not occur.

FIG. 5 shows a fifth embodiment. In FIG. 5, as in the third embodiment of FIG. 3, upper and lower outer peripheries P1 and P2 passing through the center of the through hole 2 are shown. In this portion, the meat portion 1a is left, and the air vent grooves 7E, 7E are formed in the upper portions on both sides of the meat portion 1a.
When the coil spring 3 expands and contracts in the through hole 2, the coil spring 3 satisfactorily abuts the inner peripheral surface of the through hole 2 at the upper and lower points P 1 and P 2, thereby preventing the coil spring 3 from being caught.

As described above, the upper and lower outer peripheral points P passing through the center of the through hole 2 in the zigzag direction when the coil spring 3 expands and contracts.
A vent groove 7 is provided in a part of the outer periphery of the through hole 2 except for P1 and P2.
By opening the holes A, 7B, 7C, 7D, and 7E, grooves having a good air-venting effect without causing the coil spring 3 to be caught can be opened in the through holes.

[0010]

According to the present invention, there is provided a structure in which a coil spring is provided in a through hole so as to be extendable and retractable, and a vent groove is opened at right angles to the through hole. By opening a part of the outer periphery of the through hole except the direction of the zigzag during expansion and contraction, there is no vent groove on the outer periphery of the through hole in the zigzag direction when the coil spring expands and contracts. Sometimes, the coil spring does not get caught.

[Brief description of the drawings]

FIG. 1 is a sectional view taken on line AA of FIG. 6, showing a first embodiment.

FIG. 2 is a sectional view showing a second embodiment.

FIG. 3 is a sectional view showing a third embodiment.

FIG. 4 is a sectional view showing a fourth embodiment.

FIG. 5 is a sectional view showing a fifth embodiment.

FIG. 6 is a cross-sectional view showing an arrangement structure of a conventional coil spring.

7 is a cross-sectional view taken along the line AA of FIG. 6, illustrating a structure of a conventional vent groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission case 2 Through-hole 3 Coil spring 4 Press bolt 5 Ball 6 Fork rod 6a Engagement part 7, 7A, 7B, 7C, 7D, 7E Vent groove

Claims (1)

[Claims] 1. A structure in which a coil spring is provided in a through hole so as to be extendable and contractible, and a vent groove is opened at right angles to the through hole, wherein the vent groove is formed when the coil spring expands and contracts. The arrangement structure of the coil spring, characterized in that it is opened at a part of the outer periphery of the through hole except for one direction.