JPH04302777A - Ring of multiplex winding - Google Patents

Abstract

PURPOSE:To obtain a ring of multiplex winding having two functions, one as the performance of a snap ring and the other as the performance of a seal member. CONSTITUTION:A first turn of winding 6 is overlapped on its starting end portion 6a, and, after having been turned through an angle of more than 360 deg., a second turn of winding 7 is turned, while its starting end portion 7a is being gradually outwardly moved in a gentle manner, so that its terminating end portion 7b may go over the starting end portion 7a of the second winding turn 7 to overlap this turn 7 at a portion where the inside and the outside diameter of the second winding turn 7 become fixed. By this, the first turn 6 and the second turn 7 become likely to be elastically deformed in the radial direction. As a result, when the ring is used by being fitted to a shaft or to a housing, it will be pressure contact with a mating member to have a sealing performance.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a multi-wound ring made by winding a plurality of elastic strips in a spiral shape in the axial direction.
Especially regarding rings with sealing properties.

0002

2. Description of the Related Art As a multi-wound ring of this type, there is a double-wound ring (R) (trade name Spirolox) as shown in FIGS. 7 and 8. This is made by winding spring steel of a fixed plate width and plate thickness in a spiral shape in the axial direction and in a tight manner.

0003

[Problem to be solved by the invention] The double-wound ring (R
) has a 360° holding surface and can withstand high thrust loads, so it can be used by fitting into an annular groove formed on the outer peripheral surface of the shaft or the inner peripheral surface of the cylindrical body. It is used as a retaining ring to prevent relative movement of the cylindrical body in the axial direction, or simply as a spacer ring.

[0004] The above-mentioned double-wound ring (R) has only a very small amount of elasticity in the radial direction, since it is simply wound strips of a certain shape so that the inner and outer diameters are the same. I haven't.

Therefore, for example, as shown in FIG.
Slider (3) inserted between 1) and housing (2)
) in the axial direction is controlled by an annular groove (
At the same time, the relatively high pressure fluid (4) supplied between the shaft (1) and the housing (2) is attempted to be sealed by the ring (R). When this occurs, a slight gap will be created between the fitting part of the shaft (1) and the ring (R) and the abutment surface between the ring (R) and the housing (2), which will prevent fluid (4) from leaking. Can not do it. In such a case, it is necessary to maintain airtightness between the shaft (1) and the housing (2) by using an O-ring (not shown), which is undesirable as it increases the number of parts and man-hours.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a multi-wound structure in which one ring has the dual functions of a retaining ring and a sealing member. The goal is to provide a ring.

[0007]

[Means for Solving the Problems] The above object is to provide a multi-wound ring in which a strip made of an elastic material is spirally wound in a plurality of rings, in which the second and subsequent turns are wound at a required period of 360° or more. This can be achieved by alternating the inner and outer diameters in two stages, large and small.

[0008]

[Operation] Due to the difference in the inner and outer diameters of the ring wound first and the ring wound later, the ring becomes more likely to be elastically deformed in the radial direction. Therefore, when used by fitting into a shaft or a housing, for example, it comes into pressure contact with the mating member and has sealing properties.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. As shown in FIGS. 1 to 4, the multi-wound ring (5) of the present invention is made of an elastic metal material such as a piano wire (hard steel wire), an oil-tempered wire, or a stainless steel wire with a predetermined plate width. It is formed into a thick strip and then tightly wound into a spiral ring shape.

That is, after winding the first layer (6) to a point slightly exceeding 360° so as to overlap its starting end (6a), the second layer (7) is wound around its starting end (6a). By gradually changing the winding start) (7a) outward (diameter expansion direction) in an arc shape, the inner and outer diameters are displaced in the diameter expansion direction by approximately 1/2 of the plate width of the first weight (6). At the same time, the terminal end (end of winding) (7b) overlaps with the point where the inner and outer diameters are constant beyond the starting end (7a) of the second double stitch (7), as shown in FIG. It is wound to the point where it becomes a triple winding.

[0011] When wound in this manner, the inner and outer diameters of the ring (5) will inevitably become a perfect circle, and the diameter will expand in either the first layer (6) or the second layer (7). Alternatively, when a load is applied in the direction of radial reduction, the material becomes relatively elastically deformed in the radial direction. At this time, since the diameter of the starting end (7a) of the second double eyelet (7) is gradually expanded, the whole is elastically deformed uniformly.

FIG. 5 shows an example of the use of the multi-wound ring (5), in which the annular groove (1a) of the shaft (1) is similar to the conventional one.
The shaft (1) and the slider (3) fitted thereto are fitted into the housing (2) while the ring (5) is slightly reduced in diameter, with the ring (5) tightly fitted on the outside. It is.

[0013] By doing this, it goes without saying that the slider (3) is prevented from moving in the axial direction (to the right in the figure).
Due to the elastic force that causes the ring (5) to expand in diameter, the inner peripheral end of the first ring (6) is at the bottom of the annular groove (1a), and the outer peripheral end of the second ring (7) is at the bottom of the annular groove (1a). On the inner peripheral surface of (2),
Because they are in pressure contact with each other, even if high-pressure fluid (4) is supplied between the shaft (1) and the housing (2), the amount that leaks through the multi-wound ring (5) to the slider (3) is effectively reduced. Can be controlled.

FIG. 6 shows an example of a quadruple multi-wound ring (8) by alternating the inner and outer diameters in two large and small steps. The contact area with (2) increases, resulting in better sealing performance.

In the above embodiment, since the width and thickness of the first ring (6) and the second ring (7) are the same, there is an advantage that a band plate having a constant shape can be used. There is.

The present invention is not limited to the above embodiments, but can take various forms. For example, in the embodiment, the width and thickness of the first layer and the second and subsequent layers are the same, but they may be changed as appropriate depending on the width and depth of the annular groove (1a). .

Furthermore, the multi-wound ring (5) of the above embodiment (
8) can also be used as a hole, that is, by being fitted into the housing (2) side. The inner and outer peripheral surfaces of the rings (5) and (8) may be plated with chrome or the like to increase wear resistance.

An elastic synthetic resin material may be used as the material for the rings (5) and (8). The number of turns of the ring is
Of course, the present invention is not limited to the above embodiments.

[0019]

Effects of the Invention According to the present invention, since the present invention has both the functions of a retaining ring and a sealing member, when used in a place where a retaining ring and airtightness are required, for example, a sealing member such as an O-ring can be used. There is no need to provide a , the number of parts and man-hours are reduced, and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a right side view as well.

FIG. 3 is a longitudinal side view taken along line A-A in FIG. 1;

4 is an enlarged cross-sectional plan view taken along line BB in FIG. 3; FIG.

FIG. 5 is an explanatory diagram showing an example of use of the present invention.

FIG. 6 is an explanatory diagram showing an example of use of another embodiment of the present invention.

FIG. 7 is a front view of a conventional ring.

FIG. 8 is a right side view as well.

FIG. 9 is an explanatory diagram showing an example of the use of a conventional ring.

[Explanation of symbols]

(1) Axis
(2) Housing (3) Slider
(4) Fluid (
5) Multi-wound ring
(6) First layer (6a) Starting end
(7) Second grade (7a)
Starting end
(7b) End part (8) Multi-wound ring

Claims (3)

[Claims] Claim 1: In a multi-wound ring made of a plurality of spirally wound strips made of an elastic material, the inner and outer diameters of the second and subsequent turns are changed in size by 2 degrees at a required cycle of 360° or more.
A multi-wound ring characterized by alternating stages. 2. The multi-wound ring according to claim 1, wherein the portion where the inner and outer diameters change gradually and gently expands or contracts in diameter. 3. The multi-wound ring according to claim 1, wherein the ring wound first and the ring wound later have the same width and thickness.