JP2003206968A - Tube for preventing occurrence of abnormal noise of coil spring, and coil spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent slippage from a coil wire at a time of contact between coil wires. <P>SOLUTION: A flexible synthetic resin tube 1 is bent in an annular shape of a desired diameter. The flexible synthetic resin tube 1 is cut in a circumferential direction to form end portions 2, 3 in the circumferential direction, and the end portions 2, 3 in the circumferential direction are overlapped with each other over the whole circumference thereof in a bending direction. An overlapping part of the the end portions 2, 3 directs an axial direction of a center axis seen from the bending direction of the flexible synthetic resin tube 1 on an outer periphery of the flexible synthetic resin tube 1. In the flexible synthetic resin tube 1, the overlapping part is caught between a mounting part for a coil spring and a spring seat. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil spring mounted on a wire of a coil spring in order to avoid noise caused by contact between a coil mounting seat and a mounting portion of the coil spring or contact between coil wires. The present invention relates to a sound generation prevention tube and a coil spring equipped with the abnormal sound generation prevention tube.

[0002]

2. Description of the Related Art When a coil spring is compressed, an abnormal sound is generated due to the contact between the coil wire attachment portion and the coil attachment seat or the coil wires. In order to avoid this, the coil wire is covered with the abnormal sound generation prevention tube. For example, Japanese Unexamined Patent Publication No. 2000-304079 discloses such an abnormal noise preventing tube made of a soft synthetic resin.

[0003]

By the way, when the coil wires come into contact with each other, the coil wires come into contact with the abnormal sound generation preventing tube, and the abnormal sound generation preventing tube is displaced from the coil wire. , It may turn over and generate abnormal noise. That is, since the abnormal noise prevention tube is simply covered or fitted on the coil wire, the abnormal sound generation tube is displaced from the coil wire when the coil wires come into contact with each other, and abnormal noise is generated. It may happen.

Therefore, the present invention has been made in view of the above-mentioned problems, and a tube for preventing abnormal noise from being generated in a coil spring for preventing the coil wires from being displaced from each other when the coil wires come into contact with each other. Also, it is intended to provide a coil spring fitted with a tube for preventing the generation of abnormal noise.

[0005]

In order to solve the above-mentioned problems, a tube for preventing abnormal noise of a coil spring according to the invention as set forth in claim 1 is mounted on the coil of the coil spring fixed by a coil mounting seat. A tube for preventing abnormal noise of a coil spring attached to a mounting portion to a seat, the tube having a C-shaped cross section, the circumferential end portion or the vicinity thereof facing the coil mounting seat at the mounting portion. It is characterized by being located in.

The abnormal noise preventing tube for the coil spring according to the second aspect of the present invention is attached to the attachment portion in the abnormal noise preventing tube for the coil spring according to the first aspect of the invention. In the state, the end portions in the circumferential direction overlap each other. Further, the abnormal sound generation preventing tube of the coil spring according to the invention of claim 3 is the abnormal sound generation preventing tube of the coil spring according to the invention of claim 1, wherein the tube is attached to the attachment portion, It is characterized in that the circumferential ends are separated from each other to form a slit therebetween.

According to a fourth aspect of the present invention, there is provided an abnormal noise preventing tube for a coil spring according to the third aspect, wherein the coil spring abnormal noise preventing tube has circumferential ends. It is characterized in that it has a concavo-convex shape that is continuous over the entire circumference in the bending direction following the coil spring. Further, the abnormal sound generation preventing tube for a coil spring according to the invention of claim 5 is the abnormal sound generation preventing tube for a coil spring according to any one of claims 1 to 5, wherein: It is characterized in that the end portion has a protruding portion extending in the circumferential direction so as to intersect the facing portion.

According to a sixth aspect of the present invention, there is provided a coil spring, wherein the abnormal noise preventing tube of the coil spring according to any one of the first to fifth aspects is attached to a coil attachment seat. It is characterized by being fitted.

[0009]

According to the first aspect of the present invention, when the coil spring is attached to the coil mounting seat, the circumferential end portion or the vicinity thereof is sandwiched between the mounting portion and the coil mounting seat. , Even when the coil wires come into contact with each other due to compression of the coil spring,
The abnormal sound generation tube of the coil spring is not displaced with respect to the coil wire, and the abnormal sound can be prevented from being generated.

According to the second aspect of the invention, since the end portions in the circumferential direction overlap each other in the state where the abnormal sound generation preventing tube is attached to the attachment portion, the attachment portion and the coil attachment seat are separated from each other. It is possible to surely hold it between them, and it is possible to surely prevent the deviation of the abnormal sound generation tube of the coil spring with respect to the coil wire. Further, according to the invention described in claims 3 and 4,
Since the noise prevention tube of the coil spring can be attached to the coil spring attachment part from the slit formed by the circumferential end portions being separated from each other, the noise prevention tube of the coil spring can be easily coiled. It can be attached to the attachment site of the spring.

According to the fifth aspect of the present invention, for example, the body portion (for example, the intermediate portion) of the protruding portion is sandwiched between the attachment portion and the coil attachment seat, so that the coil spring for the coil wire is provided. It is possible to securely prevent the abnormal sound generation prevention tube from being displaced. Further, according to the invention of claim 6, the coil spring prevents generation of abnormal noise during compression.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In this embodiment, the present invention is applied to a soft synthetic resin tube.
1 is a plan view of the soft synthetic resin tube 1, FIG. 2 is an enlarged cross-sectional view of the soft synthetic resin tube 1 taken along the line AA in FIG. 1, and FIG. 3 is a soft synthetic resin tube. Tube 1
Shows a part of.

As shown in FIGS. 1 to 3, the soft synthetic resin tube 1 is formed into a ring shape having a desired diameter. Further, the soft synthetic resin tube 1 has circumferential end portions 2 and 3 which are separated from each other in the circumferential direction, and the circumferential end portions 2 and 3 overlap each other in the entire bending direction. It has a shape. Here, the overlapping portions of the circumferential end portions 2 and 3 are the soft synthetic resin tube 1
2 is located on the outer periphery of the flexible synthetic resin tube 1 in the axial direction (downward in FIG. 2) of the central axis as seen from the bending of the tube 1. The soft synthetic resin tube 1 is, for example, a soft synthetic resin tube made of soft polyurethane, polyacetal, nylon, or the like.

The circumferential end portions 2 and 3 are overlapped with each other, because the soft synthetic resin tube 1 is molded with an elastic force so as to reduce its diameter.
That is, if the circumferential end portions 2 and 3 are expanded in the circumferential direction so that the circumferential end portions 2 and 3 do not overlap, the soft synthetic resin tube 1 forms an annular body having a C-shaped cross section. Like The soft synthetic resin tube 1 having such a shape is fitted to the seat attachment portion 101 of the coil spring 100, as shown in FIG. Here, the soft synthetic resin tube 1 is attached to the seat attachment portion 101 by pushing the circumferential ends 2 and 3 and pushing the seat attachment portion 101 into the soft synthetic resin tube 1.

Further, by making the inner diameter of the soft synthetic resin tube 1 slightly smaller than the diameter of the coil wire of the coil spring 100, the soft synthetic resin tube 1
Tightens the coil spring 100, and as shown in FIGS. 1 to 3, the circumferential ends 2 and 3 overlap each other over the entire circumference. The portion where the circumferential end portions 2 and 3 overlap each other is located at the facing portion of the spring seat 202, which will be described later, in the seat mounting portion 101.

In this way, the coil spring 100 fitted with the soft synthetic resin tube 1 has its seat attachment portion 101 fixed to the cylinder tube 201 of the shock absorber as shown in FIG. It is fitted and attached to 202. As a result, the soft synthetic resin tube 1 is sandwiched between the spring seat 202 and the seat mounting portion 101 of the coil spring 100 in a state where the circumferential ends 2 and 3 overlap each other.

Here, the seat mounting portion 101 is a coil mounting seat to which the coil spring 100 is fixed, and thus the seat mounting portion 101 is a mounting portion to the coil mounting seat. The soft synthetic resin tube 1 is configured as described above, and is attached to the coil spring 100. Next, the effect will be described. When the coil spring 100 is compressed, as shown in FIG.
Coil wire 10 on the upper side of the sheet attachment portion 101 of 0
2 may be displaced, and the upper coil wire 102 may come into contact with the soft synthetic resin tube 300 covering the seat attachment portion 101 of the coil spring 100. At this time, if a force F1 that pushes downward is generated on the upper coil wire 102, a force F2 in the tangential direction of the outer periphery of the seat attachment portion 101 is a force that displaces the soft synthetic resin tube 300 with respect to the coil wire. Acts as. In such a case, the soft synthetic resin tube 300 may be displaced or curled up with respect to the coil wire.
At this time, abnormal noise occurs.

However, in the soft synthetic resin tube 1 to which the present invention is applied, as described above, the spring seat 202 and the coil spring 1 are provided at both ends in the circumferential direction.
It is sandwiched between the sheet mounting portion 101 and the sheet mounting portion 101. As a result, the coil spring 100 is compressed to attach the coil spring 100 to the mounting portion 10.
Even if 1 contacts the upper coil wire, the circumferential end 2,
Since both ends of 3 are sandwiched between the spring seat 202 and the seat attachment portion 101 of the coil spring 100, it is possible to prevent the coil wire from being displaced or curled up. Can be prevented. Also, the circumferential ends 2, 3
Since they are overlapped and sandwiched over the entire circumference, it is possible to prevent such displacement and turning over over the entire circumference.

Further, the pinching between the spring seat 202 and the seat mounting portion 101 is ensured by the coil spring 100 being compressed by the force F3 shown in FIG. 5, that is, the coil. As the compressive force F3 of the spring 100 increases, the clamping force increases as a reaction force of the coil spring 100, so that it is possible to reliably prevent the coil wire from slipping and turning over. Further, the above-described example is the case where the coil spring 100 is compressed and bound, but the same applies when the coil spring 100 rebounds, that is, when the force acts in the direction opposite to the force F2 shown in FIG. In addition, the soft synthetic resin tube 1 can prevent the coil wire from slipping and turning over, and can prevent the generation of abnormal noise.

Further, since the openings are formed by expanding the circumferential ends 2 and 3, the coil wire can be easily mounted. The present invention is not limited to being applied as the above-mentioned embodiment. That is, the soft synthetic resin tube 1 may be provided with several drainage holes 5 as shown in FIG. For example, the drainage holes 5 are formed in the portion of the soft synthetic resin tube 1 that faces the circumferential ends 2 and 3, and are provided at equal intervals on the circumference.

In FIG. 8, a soft synthetic resin tube 1 having such a drainage hole 5 is fitted to a seat mounting portion 101 of a coil spring 100, and the seat mounting portion 101 is mounted to an upper spring seat 202. The figure is shown. In this way, the soft synthetic resin tube 1 is fitted to the seat attachment portion 101 of the coil spring 100, so that the water that has entered between the coil wire and the soft synthetic resin tube 1 is discharged to the outside. Will be able to. As a result, it is possible to prevent rust from being generated on the coil wire.

Further, in the above-described embodiment, the soft synthetic resin tube 1 is shaped such that the portion sandwiched between the spring seat 202 and the seat attachment portion 101 of the coil spring 100 overlaps the entire circumference. I am doing it. However, it is not limited to this. For example, as shown in FIGS. 9A to 9D, the circumferential end portions 2 and 3 form slits,
The shape may be such that the circumferential end portions 2 and 3 do not overlap between the spring seat 202 and the seat attachment portion 101 of the coil spring 100. 9A to 9D show a part of the soft synthetic resin tube 1 as in the case of FIG.

Here, the slit shape is a wave shape as shown in FIG. 9A, or a larger wave shape than that in FIG. 9A as shown in FIG. 9B. Or
As shown in FIG. 9 (C), it has a saw-tooth shape, or as shown in FIG. 9 (D), it has a step-wave shape. It should be noted that it can be said that the shape of the circumferential end portions 2 and 3 is a concavo-convex shape that is continuous over the entire circumference, or the protruding portions that project in the circumferential direction at the circumferential end portions 2 and 3. Can be said to have been formed.

FIG. 10 shows a state in which such a soft synthetic resin tube 1 is fitted to the seat mounting portion 101 of the coil spring 100, and the seat mounting portion 101 is fitted to the spring seat 202. Figure 11
9 (A) to 9 (D) show the soft synthetic resin tube 1 shown in FIGS. 9 (A) to 9 (D) in which the shapes of the circumferential end portions 2 and 3 are different from each other, as shown in FIG. The figure seen from the B direction is shown.

Here, the portions of the circumferential ends 2 and 3 which are sandwiched between the spring seat 202 and the seat mounting portion 101 may be the ends of the protrusions or protrusions, or the protrusions or It may be the body of the protrusion. When the body portion of the convex portion or the protruding portion is sandwiched, that is, when the protruding end of the convex portion or the protruding portion is pulled out from between the spring seat 202 and the seat mounting portion 101, the spring seat 202 and the seat mounting portion 10
It can be said that the convex portion or the protruding portion continuously intersects with No. 1.

As described above, by forming the slits so that the circumferential end portions 2 and 3 do not overlap between the spring seat 202 and the seat mounting portion 101 of the coil spring 100, As previously mentioned,
In addition to the effect of preventing the coil wire from slipping and turning over and preventing the generation of abnormal noise, the soft synthetic resin tube 1 can be easily attached to the coil wire. That is, as compared with the case where the circumferential ends 2 and 3 are overlapped with each other as described above, the coil wire can be easily attached.

If the circumferential end portions 2 and 3 are sandwiched between the spring seat 202 and the seat mounting portion 101 by the body portion of the convex portion or the protruding portion, the soft synthetic resin tube 1 becomes It is possible to reliably prevent misalignment of the coil wire. In addition, as shown in FIG.
Since the slits formed by the circumferential end portions 2 and 3 form a gap, the soft synthetic resin tube 1 fitted to the seat attachment portion 101 attached to the lower spring seat 202 is shown in FIG. As shown, the gap functions as a drain hole.

As shown in FIG. 13, the water drainage hole 5 may be provided in the soft synthetic resin tube 1 having the shape shown in FIG. In this case, the drain hole 5 comes to function when the soft synthetic resin tube 1 is fitted to the seat attachment portion 101 attached to the upper spring seat 202, as shown in FIG. . Although the shape in which the circumferential ends 2 and 3 do not overlap each other has been described by giving a specific shape, the shape is not limited to this.

Further, in the above-described embodiment, the abnormal noise preventing tube of the coil spring has been described as a soft synthetic resin tube formed of a material such as soft polyurethane, polyacetal or nylon. It is not limited. The tube for preventing the abnormal noise generation of the coil spring may be made of another material. Further, in addition to the above-described embodiment, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-304079, applying an adhesive to the inner peripheral surface of the soft synthetic resin tube 1 may be used together. It is possible. In this case, the soft synthetic resin tube 1 can significantly prevent the displacement with respect to the coil wire.

[Brief description of drawings]

FIG. 1 is a plan view showing a soft synthetic resin tube according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a soft synthetic resin tube taken along the line AA in FIG.

FIG. 3 is a perspective view showing a part of a soft synthetic resin tube.

FIG. 4 is a perspective view showing a soft synthetic resin tube fitted to a seat attachment portion of a coil spring.

FIG. 5 is a cross-sectional view showing a state in which a seat mounting portion of a coil spring fitted with a soft synthetic resin tube is mounted on a spring seat.

FIG. 6 is a diagram used for explaining a case where a seat attachment portion of the coil spring and an upper portion thereof contact each other due to compression of the coil spring.

FIG. 7 is a plan view showing a soft synthetic resin tube provided with a drain hole.

FIG. 8 is a view used for explaining the function of the water drain hole.

FIG. 9 is a perspective view showing a part of a soft synthetic resin tube having a shape in which circumferential end portions do not overlap each other.

FIG. 10 is a front view showing a state in which a seat mounting portion of a coil spring in which a soft synthetic resin tube having a shape in which circumferential end portions do not overlap each other is fitted is attached to a spring seat.

11 is a plan view showing a part of a soft synthetic resin tube as viewed from the direction of arrow B in FIG.

FIG. 12 is a diagram used for explaining that a gap is formed between the circumferential ends when the circumferential ends do not overlap each other.

FIG. 13 is a view used for explaining that a gap functions as a drain hole between circumferential end portions.

[Explanation of symbols]

1 Soft synthetic resin tube 2,3 Circumferential end 5 drainage holes 100 coil spring 101 Seat attachment site

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomohiro Kageyama             Nissan, Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan             Inside the automobile corporation F-term (reference) 3J059 AE10 BA02 DA46

Claims (6)

[Claims] 1. A tube for preventing abnormal noise of a coil spring fixed by a coil mounting seat, the coil spring being mounted at a mounting part of the coil mounting seat, the tube having a C-shaped cross section and having a circle shape. A tube for preventing abnormal noise from being generated in a coil spring, wherein a circumferential end portion or a portion in the vicinity thereof is located at an opposite portion of the coil mounting seat in the mounting portion. 2. The tube for preventing abnormal noise from being generated in a coil spring according to claim 1, wherein the end portions in the circumferential direction overlap each other in a state where the coil spring is attached to the attachment portion. 3. The coil spring according to claim 1, wherein the circumferential ends are spaced apart from each other and a slit is formed therebetween when the coil spring is mounted on the mounting portion. Tube for. 4. The abnormal noise generation of the coil spring according to claim 3, wherein each circumferential end has a concavo-convex shape which is continuous over the entire circumference in the curving direction following the coil spring. Prevention tube. 5. The end portion in the circumferential direction has a projecting portion extending in the circumferential direction so as to intersect the facing portion, according to any one of claims 1 to 4. A tube for preventing abnormal noise from being generated in the coil spring. 6. A coil spring according to any one of claims 1 to 5, wherein the abnormal noise preventing tube of the coil spring is fitted to a mounting portion to be mounted on a coil mounting seat. .