JPH07117090B2 - Retaining ring - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining ring which can be used as a shaft groove, a hole groove, or a shaft hole.

[0002]

2. Description of the Related Art Conventional snap rings for shaft grooves or hole grooves include various shapes called C type and E type.
For example, in a C-shaped retaining groove for a shaft groove, the tip of the attachment / detachment tool is inserted into the insertion holes at both ends, the space between both ends is widened to increase the inner diameter, and the shaft groove can be fitted and removed freely. Shaped hole groove snap ring inserts the tip of the detachable tool into the insertion holes at both ends, narrows the space between both ends to reduce the outer diameter, and can be fitted into and removed from the groove on the hole surface. Also, there is an advantage that attachment and detachment work is easy.

However, since the above-mentioned snap ring has a structure in which both end portions are open and separated from each other, the snap ring and the groove portion and the body to be fixed are fitted in the groove portion of the shaft or the hole. In addition, it is unavoidable that a non-fitting portion and a non-fixing portion are formed between both end portions, and this is particularly remarkable for a hole having a large gap between both end portions. (Refer to JP-B-48-9444)

There is a double-wound retaining ring as a solution to such a problem. The structure of this snap ring is that the band member having a rectangular cross section is substantially double-wound and has an annular shape, so that the non-fitting portion and non-fixing portion as in the case of the C-shaped snap ring cannot be provided. There is.

However, due to the double winding structure, there is a structural problem that the attaching and detaching work is very troublesome. For example, in order to fit into the groove portion of the hole, one end portion must be axially separated and placed in the groove portion, and while pressing this end portion, the other end portion must be sequentially inserted and fitted. When removing, the end portion on the hole opening side must be moved to the axial center side to be removed from the groove portion and drawn out to the hole opening, and then the other end portion must be sequentially removed from the groove portion and drawn out. Further, the same procedure is required for the work of attaching and detaching to the groove of the shaft, and the attaching and detaching work is very troublesome.

As described above, the C-shaped snap ring has an advantage that it can be easily attached and detached, but it has an unavoidable disadvantage that a non-fitting portion and a non-fixing portion are formed. Although the wheel has the advantage that neither the non-fitting portion nor the non-fixing portion can be used, it has problems such as the fact that the attachment and detachment work is very troublesome due to the double winding.

The Applicant has proposed to solve the above-mentioned problem by using FIG.
We are developing the retaining ring illustrated in. The structure of this retaining ring is such that the overlapping thickness of the overlapping portions 52 of both end portions 51 of the substantially annular retaining ring body 50 is equal to the thickness of the retaining ring body,
Both the overlapping portions 52 are slidable in a substantially circumferential direction and elastically returnable to each other, and when the fitting portion is fitted in the groove portion of the shaft or the hole, a non-fitting portion cannot be formed and a stable fitting condition can be obtained. In addition, since there is no fixed portion between the fixed body and the fixed body, a stable fixed state can be obtained. In the attachment / detachment work, the retaining ring main body diameter can be enlarged / reduced by sliding the overlapping portions in the circumferential direction, so that the attachment / detachment work can be easily performed. Further, it can be used not only as a shaft groove or a hole groove , but also as a shaft / hole combination, which is advantageous in terms of production and economy. (Patent application 5-14
(See No. 9343)

However, a problem common to the above C-shaped retaining ring is the work of inserting the attachment / detachment tool into the insertion holes 53 at both ends when attaching / detaching the retaining ring to / from the shaft or the groove of the hole. Since this insertion work has a small diameter, the insertion hole 53 is difficult to catch accurately at one time even with only one insertion hole 53, let alone a considerable concentration force to finish inserting the insertion holes 53 at both ends at once. Skill level is required.

Further, the insertion hole 53 is opened in one of the overlapping portions 52, and the rear side of the inserting hole 53 is located in the other overlapping portion.
In the case of being blocked by 52, when the attachment / detachment tool is inserted into the insertion hole, the leading end abuts against the overlapping portion 52 on the rear side and is blocked, so that it cannot be inserted in a penetrating manner. As a result, the tip of the attachment / detachment tool is caught in the hole surface, and there is a risk of disengagement, and because the elastic force of the retaining ring itself is strong, the retaining ring jumps when disengaged. Is afraid. In addition, the width of the retaining ring cannot be reduced because it is of the insertion type.

[0010]

The problem to be solved by the invention is to quickly and easily engage the attaching / detaching tool for the shaft groove or the hole groove with the retaining ring before the attaching / detaching operation of the retaining ring to / from the groove portion of the shaft or the hole. By doing so, it is possible to safely attach and detach the shaft or the groove portion of the hole in a reliable engagement state.

[0011]

In order to solve the above-mentioned problems, a substantially annular retaining ring main body is directed toward both ends of the retaining ring body except for the left and right concentric outer edges. It is formed in a non-concentric shape in which the width between the inner peripheral edge and the inner peripheral edge is gradually narrowed, and the overlapping thickness of the overlapping portions at the ends at the left and right ends is equal to the thickness of the retaining ring body, and the tapered overlapping surfaces at both ends. The overlapping portions formed of are formed so as to be slidable in a substantially circumferential direction and elastically recoverable from each other, and the shaft groove engaging / disengaging insertion holes are formed at the both sides of the overlapping portions.
The groove groove engaging / disengaging engagement groove is formed in the jaw-like portion on the outer edge side of both ends opposite to the tip of the end in such a manner that the groove bottom is continuous with the outer periphery of the retaining ring body without a step and is recessed toward the tip of the end. It is characterized by having done.

In the present invention, the overlapping length in the circumferential direction of the overlapped portions at both ends may be formed to have a ratio relationship that slightly exceeds the slide length of the overlapped portion when the diameter of the retaining ring body is increased. Even when the diameter of the retaining ring body is expanded, it expands and contracts while maintaining the polymerization relationship of the overlapping part,
The polymerization relationship is not lost. Further, in the embodiment in which the taper angle of the overlapping surface at both ends is about 30 to 50 degrees, the thin portion at both ends is limited to the tapered overlapping portion, and the length of the overlapping portion in the circumferential direction is limited. Since each of the snap ring has a small size, the snap ring can be fitted to the snap ring with equal strength, and the snap ring can be evenly contacted and fixed to the fixed body.
The material is a known member, and examples thereof include metal such as a spring member and resin such as engineer plastic.

[0013]

In the non-circular retaining ring main body, the width of the outer peripheral edge with respect to the inner peripheral edge is gradually narrowed toward the both end portions except the concentric left and right end portions. Formed concentrically, the overlapping thickness of the overlapping portions at the ends at the left and right ends is equal to the thickness of the snap ring body, and the overlapping portions formed by the tapered overlapping surfaces at both ends slide and move in a substantially circumferential direction. It is formed so as to be elastically recoverable, and a shaft groove engaging / disengaging insertion hole is formed on each side of the overlapping portion at both ends, and a hole groove engaging portion is provided at the outer edge side of both ends facing the tip of the end. Since the disengagement engaging groove is formed such that the groove bottom is continuous with the outer peripheral edge of the snap ring body without a step and is recessed toward the tip of the end, the outer edge portion on the side of the engaging groove for engaging and disengaging the hole groove is a guide. To guide the movement of the detachable tool toward the engaging groove smoothly. To serve as engaging groove aspects groove bottom is recessed in the end tip side Komu query the detachable tool.

Thus, when attaching / detaching to / from the hole groove, the engaging / disengaging groove can be securely engaged by simply putting the detachable tool on the outer edge portion of the side of the hole groove engaging / disengaging engagement groove and operating it. Even if you do not have much experience, you can quickly and accurately engage the attachment / detachment tool with the attachment / detachment tool, and reduce the diameter of the retaining ring body with the attachment / detachment tool to attach / detach it quickly to / from the groove of the hole. be able to. The engagement state of the attachment / detachment tool with respect to the engagement / disengagement groove for engaging / disengaging the hole groove can be a mode in which the tip of the attachment / detachment tool projects toward the rear side of the engagement groove for engagement, and is a stable engagement according to the conventional insertion hole type The fitting state is obtained, and there is no concern about the snapping of the snap ring due to disengagement. Also, when attaching and detaching the shaft to the groove part, by inserting and removing the insertion tool into the insertion hole, it can be used for the shaft groove and for both the shaft groove and the hole groove. It is also advantageous in terms of aspect. When the shaft or the groove of the hole is fitted, a non-fitting portion cannot be formed, and a stable fitting condition can be obtained, and a non-fixing portion cannot be formed between the fixed body and a stable fixing. You can get the status.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates an embodiment of the retaining ring of the present invention, which is of a type that serves both as an axial groove and a hole groove. The snap ring body 1 having a substantially annular shape has a substantially rectangular transverse cross section with the short side as the thickness and the long sides as the front and back surfaces. Concentric left and right ends 2, 3
Except for the above, it is formed in a non-concentric shape in which the width between the outer peripheral edge gradually narrows from the intermediate portion toward the left and right ends, and the left and right end portions 2 and 3 of the overlapping shape are formed in the circumferential direction. Sliding allows elastic reduction and expansion.

The left and right end portions 2 and 3 are superposed in such a manner that the back surface of the superposed portion 2a at the tip of the left end portion 2 and the surface of the superposed portion 3a at the end of the right end portion 3 are in contact with each other, and the superposed thickness of the superposed portions 2a, 3a. Has the same thickness as that of the snap ring body 1 and utilizes the elastic deformation and elastic return force of the snap ring body 1 to slide and elastically return to each other substantially in the circumferential direction. The left and right overlapping portions 2a and 3a are formed such that the overlapping surfaces are tapered at about 35 degrees, and when the retaining ring is reduced in diameter, the overlapping portion 2a is on the right end 3 surface side and the overlapping portion 3a is on the left end. The rear side of the section 2 is mounted on each side. Further, when elastically returning after the diameter of the retaining ring is expanded, the overlapping portions 2a and 3a can guide each other in the original overlapping state.

A hole groove engaging / disengaging groove 4 is formed in a jaw-shaped base portion 2b facing the tip of the end portion on the outer edge side of the left end portion 2.
Similarly, a hole-shaped groove engaging / disengaging engagement groove 4 is formed in the jaw-shaped base portion 3b facing the end tip on the outer edge side of the right end portion 3, and the groove bottom is continuous with the outer periphery of the retaining ring body without a step and It is formed in a concave shape that enters toward the tip of the end, and when attaching and detaching the hole to the groove part, the attachment and detachment tool is engaged with the left and right hole groove engaging and disengaging engagement grooves 4 and 4, and the retaining ring is attached by the attachment and detachment tool. The diameter of the main body 1 is reduced so that it can be attached and detached.

A shaft groove engaging / disengaging insertion hole 5 is provided on the side of the overlapping portion 2a of the left end 2, and a shaft groove engaging / disengaging insertion hole 5 is provided on the side of the overlapping portion 3a of the right end 3 from the front side to the back side. When the shaft is inserted into or removed from the groove part of the shaft, a detachable tool is inserted into the left and right shaft groove engaging / disengaging insertion holes 5 and 5 to engage with the shaft groove 1 It is designed to be enlarged and removable.

Thus, when attaching / detaching to / from the hole groove, the attaching / detaching tool is simply operated by applying the tip of the tool to the outer peripheral edge portion on the side of the hole groove engaging / disengaging engagement grooves 4 and 4, and the outer peripheral edge portion is guided. By acting as, it is possible to securely engage the tip of the attachment / detachment tool with the engagement groove, and the engagement work of the attachment / detachment tool with respect to the retaining ring can be performed quickly and accurately at a time without much experience. By reducing the diameter of the retaining ring body 1 with a tool, the retaining ring body 1 can be quickly attached to and detached from the groove portion of the hole.

At the time of attachment / detachment to / from the groove portion of the shaft, the tip of the attachment / detachment tool can be easily inserted by inserting it into the shaft groove engaging / disengaging insertion holes 5 and 5 for shaft groove or hole groove engaging / disengaging. The engaging grooves 4 and 4 and the shaft groove engaging / disengaging insertion holes 5 and 5 can be selectively used for quick and reliable attachment / detachment work, and both the shaft groove and the hole groove can be used as both the shaft groove and the hole groove. Can also be used for

The engagement state of the detachable tool with respect to the engaging / disengaging groove / grooves 4, 4 can be set such that the tip of the detachable tool is engaged with the rear end of the engaging groove 4, 4 protruding. Desorption insertion hole 5,
A stable engagement state similar to that of inserting and engaging with 5 is obtained, and there is no fear of a snapping accident of the snap ring due to disengagement.

When the shaft or the groove of the hole is fitted, a non-fitting portion cannot be formed, and a stable fitting condition can be obtained. In addition, a non-fixing portion cannot be formed between the object and the fixed body, which is stable. A fixed state can be obtained. Further, it can be used not only as a shaft or as a hole, but also as a shaft and a hole, which is advantageous in terms of manufacturing and economics.

Since the thin portions at the left and right end portions 2 and 3 are limited to the tapered overlapping portions 2a and 3a, and the circumferential lengths of the overlapping portions 2a and 3a are small,
Each part of the snap ring can be fitted to the groove portion with equal strength, and each part of the snap ring can evenly contact and fix the object to be fixed. In addition, since the overlapping portions 2a and 3a work by guiding each other in the original overlapping state when elastically returning after the diameter of the retaining ring is expanded,
Even if the length of the overlapping portions 2a and 3a in the circumferential direction is small, the original overlapping state can be surely restored.

Since the snap ring body 1 has a substantially rectangular cross section with the thickness on the short side and the front and back sides on the long side, the strength of fitting of the shaft or the hole into the square groove of the cross section is high and excellent. There is.

FIG. 2 illustrates an attaching / detaching tool used for attaching / detaching the retaining ring of the present invention to a groove portion of a hole or a shaft. The attaching / detaching tool 10 shown in FIG. The front end is formed to have an outward shape, and the bent engagement portion 11 at the front end can be reliably engaged with the left and right hole groove engaging / disengaging engagement grooves 4 and 4. The detachable tool 20 shown in (B) is for a shaft groove, and the tip is formed inward> shape, and the bent engaging portion 21 at this tip is inserted into the left and right shaft groove engaging / disengaging holes 5, 5. 5
Is surely engaged with.

[0026]

EFFECT OF THE INVENTION A. According to claim 1, at the time of attachment / detachment to / from the hole groove, only by operating the attachment / detachment tool by applying the tip of the attachment / detachment to the outer peripheral edge portion on the side of the engaging groove for engaging / disengaging the hole groove, the outer peripheral edge portion functions as a guide edge. , The tip of the detachable tool can be securely engaged with the engagement groove, and the engaging work of the detachable tool with respect to the retaining ring can be performed quickly and accurately at a time without much experience. By reducing the diameter of the main body, it is possible to quickly attach / detach to / from the groove portion of the hole.

B. According to the same paragraph, when attaching / detaching to / from the groove portion of the shaft, the tip of the attachment / detachment tool can be easily inserted by inserting it into the shaft groove engaging / disengaging insertion hole, and the hole groove engaging / disengaging engaging groove or The shaft groove engaging / disengaging insertion hole can be properly used for quick and reliable attachment / detachment work, and the shaft groove and the hole groove can be used for both the shaft groove and the hole groove.

C. According to the same paragraph, the engagement state of the attachment / detachment tool with respect to the engagement groove for engagement / disengagement of the hole groove can be changed to a mode in which the tip of the attachment / detachment tool protrudes and engages with the rear side of the engagement groove, and A stable engagement state similar to the insertion engagement is obtained, and there is no fear of the snap ring jumping accident due to disengagement.

D. According to the above paragraph, when the shaft or the groove of the hole is fitted, the non-fitting portion cannot be formed, and a stable fitting condition can be obtained. The fixed state can be obtained.
And it can be used as a shaft or hole, and can also be used as a shaft and a hole.
It is also advantageous in terms of production and economy.

E. According to the same paragraph, the thin parts at both left and right ends are limited to the tapered overlapped part, and the circumferential length of the overlapped part is small, so that each part of the retaining ring has equal strength to the groove part. It can be fitted, and even with respect to the fixed object, it can be fixed by equally contacting each part of the snap ring. Further, when the snap ring is elastically restored after the diameter is expanded, the overlapped portions guide each other in the original overlapped state, so that even if the length of the overlapped portion in the circumferential direction is small, the original overlapped portion can be reliably made. Can return to the state.

[Brief description of drawings]

1A and 1B show an axial groove / hole groove combined type in one embodiment of a retaining ring of the present invention, FIG. 1A is a front view, and FIG. 1B is a bottom view.

FIG. 2 is a partial front view showing an example of a detachable tool used for the retaining ring of the present invention, (A) shows a detachable tool for a hole groove, (B)
Shows a detachable tool for the shaft groove.

FIG. 3 is a front view illustrating a conventional retaining ring.

[Explanation of symbols]

 1 retaining ring main body 2 left end 2a left end overlapped part 2b left end base (jaw-like part) 3 right end 3a right end overlapped part 3b right end base (jaw-like part) 4 hole groove engaging / disengaging engagement Groove 5 Insertion hole for shaft groove engagement / disengagement 10,20 Detachable tool 11,21 Engagement part of detachable tool

Claims (1)

[Claims] 1. A mode in which a substantially annular retaining ring main body has an outer peripheral edge with respect to an inner peripheral edge, the width between the inner peripheral edge and the outer peripheral edge is gradually narrowed toward both end portions except for the left and right concentric end portions. The non-concentric circles are formed, and the overlapping thickness of the overlapping portions at the ends at the left and right ends is equal to the thickness of the main body of the snap ring, and the overlapping portions consisting of the tapered overlapping surfaces at both ends are arranged in a substantially circumferential direction. It is formed so that it can slide and elastically return, and a shaft groove engaging / disengaging insertion hole is formed beside each overlapping portion of the both ends, and a hole is formed in the jaw-like portion on the outer edge side of both ends facing the tip of the end. A retaining ring, wherein the engagement groove for engaging and disengaging the groove is formed in such a manner that the groove bottom is continuous with the outer peripheral edge of the retaining ring main body without a step and is recessed toward the end tip side.