JPH0637614U - Fastening ring - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an inexpensive new shape fastening element that can realize high gripping force and high center matching when fixing or holding a rotating body or the like on a shaft. A ring having a plurality of arcuate elastic bodies of the same shape that are chained together to form a ring, and all of the arcuate elastic bodies have the same protrusion direction inward or outward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is applied to a general rotating machine or the like by press-fitting between the rotating body and the shaft to fix the rotating body to the shaft, or by winding or closely contacting the shaft to hold the rotating body on the shaft. The present invention relates to a ring-shaped fastening element similar to a retaining ring, which is used for a long time.

[0002]

[Prior art]

 Keys, splines, snap rings, and the like are conventionally known as fastening elements for fixing or holding a rotating body to a shaft. (Kiyoshi Onishi, "Introduction to Mechanical Design" p36, published by Rikagakusha)

The key is most typically a prismatic one, and is pressed into an axial groove dug between the rotating body and the shaft to fix the rotating body to the shaft. The spline shaft is a shaft in which mountain-shaped parts corresponding to some keys are directly cut out at equal intervals, and a groove that fits into this is also carved on the rotating body. This rotating body is press-fitted onto the spline shaft and fixed. These keys and splines each have a large force for the rotating body to grasp the shaft, and can transmit a sufficiently large torque from the shaft to the rotating body.

A retaining ring is a typical example of which is shown in FIG. 2. The retaining ring is slightly enlarged in the circumferential direction by utilizing the spring action of the retaining ring in a groove cut in the shaft. It has the function of holding the rotating body that has been fitted and fitted into the shaft so that it does not come out of the shaft.

[Problems to be solved by the device]

However, each of these fastening elements has some drawbacks. Fixing with a key has the drawback that the center of the rotor deviates from the center of the shaft by the difference between the inner diameter of the rotor and the outer diameter of the shaft. In the spline, the center of the shaft and the center of the rotating body are sufficiently coincident with each other, but there is a drawback in that machining is time-consuming and expensive.

Further, the conventional snap ring also has drawbacks. The retaining ring essentially grasps the axis only on the line D-D 'in Fig. 2, and it cannot be said that it has a sufficiently high grasping force. It is essential to provide the shaft with a groove for fitting the retaining ring so that it does not move in the axial direction, and the retaining ring cannot be fixed at any position on the shaft. Further, the conventional snap ring has a small elasticity, and there is a drawback that the range of the shaft diameter to which one snap ring can fit is narrow.

The present invention has been made under such a background, that is, an inexpensive new shape capable of realizing a high grasping force and a high center matching when fixing or holding a rotating body or the like on a shaft. The purpose is to provide a fastening element.

[Means for Solving the Problems]

As shown in FIG. 3 and FIG. 4, the shape of the fastening element of the structure according to the present invention is such that a plurality of arc-shaped or U-shaped elastic bodies (1) are connected to form a ring. It was done. Then, all of the arcuate elastic parts are made to have the same shape, and the projection directions of all the arcuate parts are set to the inner side as shown in FIG. 3 or the outer side as shown in FIG. And Therefore, the joining portion (2) and the apex portion (3) of the arcs adjacent to each other are present on the circumferences of the concentric circles A and B, respectively. The number of arc-shaped portions is set to an appropriate number of 4 or more depending on the purpose of use, and the cross-sectional shape is appropriately selected such as circular, rectangular or trapezoidal.

[Action]

When an external force is applied to such a ring, the ring deforms concentrically. For example, in Fig. 1, when the C and C'parts of the ring indicated by the solid line are pushed inward, the ring is deformed like the ring shape indicated by the dotted line, and the line connecting the arc joints after the deformation and the apex of the arc are formed. The connecting lines are all circular and concentric with that before deformation.

The ring thus deformed is fitted into the hole of the rotating body having an inner diameter slightly larger than the inner diameter of the ring (the diameter of the circle formed by the arcuate joints) in the abandoned state, and the external force is removed. Due to the spring action of the part, it expands concentrically and is fixed to the inner surface of the hole. In this way, the ring closely adheres to the inner surface of the hole at all of the many arcuate joints, so that a strong adhesive force is exhibited.

When it is desired to attach a ring to the shaft, an outwardly bent ring as shown in FIG. 4 can be used to obtain the same action as described above, that is, concentric deformation and strong gripping force. .

【Example】

FIG. 5 shows an example in which the ring according to the present invention is used for fixing to a shaft of a rotating body. Here, the ring (4) is first mounted inside the hole of the rotating body (5). Then, the shaft (6) having a tapered tip is press-fitted into this hole and fixed. Due to the strong gripping force of the ring, a large torque can be transmitted from the shaft to the rotating body. This embodiment has the advantage that the matching of the center of the rotating body and the center of the shaft is guaranteed for the key system, and the cost is low for the spline system. Furthermore, the method of directly press-fitting the tapered shaft into the hole of the rotating body has the advantage that the rotating body can be fixed at the desired axial position regardless of the taper angle due to the elasticity of the ring. ing.

As shown in FIG. 6, the rotating body (5) may be sandwiched between two rings (4) and fixed at an arbitrary position on the shaft (6). In this case, slippage may occur between the rotor side surface and the ring side surface, but this can be solved by providing the rotor side surface with protrusions or depressions that match the ring side surface shape. This is a convenient fixing method that is applied to plastic gears that do not have the disadvantage of processing such a rotating body.

On the other hand, the ring according to the present invention can be used as an alternative to a snap ring for holding a rotating body by a shaft or for holding a shaft by a rotating body. In this case, as described above, the groove is not necessary and the ring can be set at any position. However, it is also possible to dig a groove and install a ring with a small grasping force with a small number of arcuate portions. At this time, since the elasticity of the ring is large, one ring can handle a large range of the shaft outer diameter and the rotor hole diameter.

[Effect of device]

The fastening ring according to the present invention has a very simple shape and can be mass-produced at low cost. Then, as described in detail above, the ring can be wound around the shaft or inscribed in the hole of the rotating body to exhibit high adhesion, and the rotating body or shaft can be held at any position. In addition, the flexibility of the ring size at this time is high. If this ring is inserted between the shaft and the rotating body, those fastened bodies having a large torque transmission force and a high center conformity can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a modification of a fastening ring according to the present invention.

FIG. 2 is a diagram of a retaining ring, which is one of the conventional fastening elements.

FIG. 3 is a view of a fastening ring according to the present invention.

FIG. 4 is a view of a fastening ring according to the present invention.

FIG. 5 is an example in which the fastening ring according to the present invention is applied to fixing the rotating body to the shaft.

FIG. 6 is an example in which the fastening ring according to the present invention is applied to fix the rotating body to the shaft.

[Explanation of symbols]

 A, A'Circle connecting arc junctions, or section B, B'Circle connecting arc vertices, or section C, C'External force application point D, D'Axis contact point 1 Arc shape Elastic body 2 Arc joint 3 Arc top 4 Ring 5 Rotator 6 Axis

Claims (1)

[Scope of utility model registration request] 1. A plurality of arcuate elastic bodies of the same shape are chained to form a ring, and all of the arcuate elastic bodies have the same inward or outward protrusion direction. ring.