JPH0139926Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a C-shaped retaining ring. A retaining ring for a shaft used to engage with an annular engagement groove provided at one end of a connecting shaft to inhibit movement of the rotating shaft or to prevent an object fitted onto the connecting shaft from coming off, and various other types. It fits into an engagement surrounding concave groove formed on the inner circumferential surface of one end of a hole in a frame of a device or other frame to stop the shaft inserted into the hole in the normal position or to prevent it from coming off the hole. This relates to a retaining ring for a hole to be used.

(Prior Art) This type of C-shaped retaining ring has, for example, a C-shaped annular main body with the maximum width at the center and the width gradually narrowing toward both separated ends, and the circumference of this annular main body. It is known that a plurality of inward adjustment bent portions are formed at regular intervals along the direction, and projecting portions are provided on the outside of both ends of the annular main body with through holes for engaging and disengaging the tip of the pliers ( Tokuko Showa 53-18659
(see issue). This C-shaped retaining ring is made by engaging the tip of the pliers with the through hole of the above-mentioned overhanging part, separating it and expanding the annular main body, and forming an annular engagement groove with a constant diameter at one end of the rotating shaft or connecting shaft. I'm trying to make it engage.

(Problem to be solved by the invention) As mentioned above, the conventional C-shaped retaining ring is formed by making the width at the center the maximum width and gradually narrowing the width toward both ends of the C-shaped annular main body. By forming the inward adjustment bent portion in the main body, the range in which the annular main body can expand is increased with maximum stress in the central portion.

However, according to the above conventional example, the inward adjustment bent portions are formed at regular intervals along the circumferential direction of the annular main body, so the expansion effect cannot be maximized, and the expansion shape is close to a circle. It becomes a thing. Therefore, there was a drawback that it was difficult to adapt the width of a constant diameter to the annular engagement groove.

In addition, since the centers of the outer edge line forming the outer edge of the annular main body and the inner edge line forming the fitting circular arc portion of the inward adjustment bending portion do not coincide with each other, when used as a retaining ring, the area of the abutting portion is The width is determined by the width at the end of the ring, and the area of the annular main body cannot be used effectively.

The present invention has been developed in view of the above circumstances, and has a wider expansion range than conventional C-shaped retaining rings, which allows for fitting into the annular engagement groove of large shafts with different diameters. It is an object of the present invention to provide a C-shaped retaining ring that can be easily used in conjunction with a retaining ring and that can effectively utilize the area of the annular main body when used as a retaining ring.

(Means for solving the problems) The present invention takes the following measures to achieve the above object.

That is, a C-shaped annular main body is formed by making the width at the center the maximum width and gradually narrowing the width toward both separated ends, and a plurality of inward adjustment bent parts are symmetrically formed in the direction of the center of the C-shaped annular main body. do.

The plurality of inward adjustment bent portions are adjusted such that the bending depth of the portions closer to the narrowed and separated ends is increased so that the inner edges of the inward adjustment bent portions are on the same circular line. , the inner edge of the inward adjustment bend is formed into a plurality of segmented fitting circular arc parts.

Further, the circumferential width of the inward adjustment bent portion becomes smaller toward both ends of the annular main body.

Further, the outer edge line forming the outer edge of the annular main body and the inner edge line forming the fitting circular arc portion of the inward adjustment bending portion are concentric circles having the same center and radii R and R'.

(Function) The present invention has the maximum width at the center as described above,
A plurality of inward adjustment bent portions are formed on the annular main body whose width is gradually narrowed toward both ends of the separated annular main body so that the bending depth in the center direction of the annular main body can be gradually increased toward both ends of the annular main body. The inner edge of the adjustment bent portion is located on the same circular line to form a fitting circular arc portion that is divided into a plurality of parts, and at the same time, the circumferential width of the inward adjustment bent portion is made smaller toward both ends of the annular main body. ing.

Therefore, when the tips of the pliers are inserted into the through holes at both ends of the annular main body and the holes are expanded, the annular main body is opened by the interconnected adjustment action of the plurality of inward adjusting bends and the arcuate portion formed by gradually decreasing the width. can be expanded as much as possible.

In addition, since the outer edge line forming the outer edge of the annular main body and the inner edge line forming the fitting circular arc portion of the inwardly bent portion are concentric circles with the same center and radii R and R',
When installed as a retaining ring, the effective area of the contact portion can be increased over the entire circumference of the annular main body, and its functionality can be improved.

(Example) Next, an example of implementation of the present invention will be described in detail with reference to the drawings.

The width of the central part 1 is set to the maximum width, and the width of the annular main body 3 is gradually narrowed toward the separated ends 2 and 2'. A plurality of inward adjustment bent portions 5 are symmetrically formed, the bending depth of which gradually increases as it approaches both ends of the annular main body.

The outer circular line 6 forming the outer edge of the annular main body 3 and the inner circular edge 7 forming the inner edge (fitting circular arc portion 12) of the inward adjustment bending portion 5 are radiuses that share the same center 8 as shown in FIG. The inner bottom of the bottom part 11 of the inward adjusting bent part 5 is formed into a concentric circle of R and R', and the inner bottom of the bottom part 11 of the inward adjustment bent part 5 is located on a circular line 10 of radius l centered on the eccentric point 9 on the center line 4 slightly above the center 8. The plurality of inward adjustment bent portions 5 arranged symmetrically with 11' have a deeper depth as they are closer to the separated ends 2, 2' of the annular main body 3, and are provided with a fitting circular arc portion 12. The width of the bottom portion 11 is made small.

Also, the center line 4 slightly below the center 8
The inner edge 16 of the circular arc portion 15 of the annular main body 3 formed by the plurality of inward adjustment bent portions 5 is located on a circular line 14 having a radius l′ centered on the upper eccentric point 13, The width of the circular arc portion 15 is the closer to the separated ends 2, 2' of the annular main body 3, the wider the width of the circular arc portion 15 is.
As shown in the figure, it is narrower.

and a through hole 17 that engages the tip of the pliers;
17', the separated ends 2 of the annular main body 3,
One of the two ends 2' is provided with a step notch 18, and both ends 2, 2' are formed asymmetrically.

Incidentally, the reference numeral 19 in the drawings is an inclined surface for engagement provided on one side of the fitting circular arc portion 12.

According to this embodiment, the joint adjustment effect of the inward adjusting bent portions 5 and the arcuate portion 15, which are formed symmetrically with a gradually decreasing width, and the circumferential width of the inward adjusting bent portions 5 are adjusted at both ends of the annular main body 3. Since it is formed so that it becomes smaller toward the parts 2 and 2', the annular main body 3 can be expanded more widely than a conventional retaining ring for a shaft. As a result, it can be adapted to the annular engagement groove of a large shaft with a certain degree of diameter difference, and
There is an advantage that the degree of freedom in deforming the annular main body 3 is widened, for example, in that it can be deformed into an elliptical shape and can be easily adapted to the annular engagement groove of the shaft.

Further, since both ends 2 and 2' of the annular main body 3 are formed in an asymmetrical shape, an engaging inclined surface 19 is provided on the fitting circular arc portion 12, and an inclined surface is formed on the inner peripheral surface of one side of one end of the shaft. By looking at both ends 2 and 2' of the annular main body 3 when engaging the annular main body 3 with the provided annular engagement groove, the annular main body 3 can be quickly and accurately engaged with the annular engagement groove without the risk of turning the front and back sides wrong. can be combined.

Furthermore, since the outer edge line forming the outer edge of the annular main body and the inner edge line forming the fitting circular arc part of the inward adjustment bending part are concentric circles with the same center and radii R and R', it can be installed as a retaining ring for the shaft. In this case, the effective area of the contact portion becomes large over the entire circumference of the annular main body 3, and its functionality can be improved.

In this embodiment, a C-shaped retaining ring used as a retaining ring for a shaft has been described, but a similar configuration can also be used as a retaining ring for a hole.

(Effects of the invention) According to the invention, the circumferential width of the inward adjustment bent portion is formed to become smaller toward both ends of the annular main body. The expansion action of the main body can be increased, and the degree of freedom of deformation of the annular main body can be increased.

In addition, since the outer edge line forming the outer edge of the annular main body and the inner edge line forming the fitting circular arc portion of the inward adjusting bending portion are concentric circles with the same center and radii R and R', when attached as a retaining ring, , the effective area of the contact portion can be increased over the entire circumference of the annular main body, and its functionality can be improved.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a front view, FIG. 2 is a sectional view taken along line A-A', and FIG. 3 is a side view. 1... Central part, 2, 2'... Both ends, 3... Annular main body, 4... Center line, 5... Inward adjustment bending part,
7...Inner circle line, R'...radius.

Claims (1)

[Scope of utility model registration request] Both ends 2 are separated by making the width of the center part 1 the maximum width,
The annular main body 3 is formed into a C-shape with the width gradually narrowing toward 2', and the bending depth toward the center of the C-shaped annular main body 3 is made to extend toward both ends 2, 2' of the annular main body 3. Then, the fitting circular arc portion 12 of the bottom portion 11 is made to coincide with the inner edge line 7 of the radius R′, and its circumferential width becomes smaller toward both ends 2, 2′ of the annular main body 3. A plurality of inward adjustment bent portions 5 are formed as shown in FIG. A C-shaped retaining ring characterized by concentric circles with the same radii R and R'.