JP2517345Y2 - E type retaining ring - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention enables the removal force of the E-shaped retaining ring fitted to the shaft to be smaller than that of the conventional E-shaped retaining ring. Regarding the retaining ring.

[Conventional technology]

JIS standards have been established for E-type retaining rings, and JIS standard products are generally used.

FIG. 6 is a front view of an E-shaped retaining ring A for a shaft established by JIS standard, and FIG. 7 is a state in which the E-shaped retaining ring A is fitted in a retaining ring insertion groove 1 provided around a shaft S. The longitudinal sectional view of the E-shaped retaining ring A is shown.

The material of the E-shaped retaining ring A is steel for springs or stainless steel for springs.
As shown in the figure, the inner diameter d is slightly smaller than the outer dimension of the snap ring insertion groove 1, and the inner peripheral surface is provided with a recess 2 for facilitating elastic deformation. Further, an opening surface 3 having a wider distance from the inner peripheral surface toward the outer peripheral surface is provided, and a pushed protrusion 4 is formed at a position where the opening surface 3 and the outer peripheral surface intersect.

The conventional E-shaped retaining ring A having the above-described structure is attached to the shaft S.
In order to fit into the retaining ring insertion groove 1, the opening surface 3 is pressed against the retaining ring insertion groove 1 to elastically expand the opening surface 3
The die retaining ring A is fitted into the retaining ring insertion groove 1 of the shaft S (7th
See figure).

The E-shaped retaining ring A fitted on the shaft S has a function of positioning the parts fitted on the shaft S or preventing the parts from coming off.

When removing the E-shaped retaining ring A, as shown in FIG. 8, the pressing portions 6 are provided on both sides of the concave portion 5 provided in the central portion of the tip.
When the tip of the pushed projection 4 is pressed by the pressing tool T having a groove formed therein, the inner peripheral surface side end 3a of the opening surface 3 slides on the shaft S and the interval between the inner peripheral surface side end 3a increases. When elastic deformation occurs and the distance between the end portions 3a on the inner peripheral surface side expands to the diameter of the retaining ring insertion groove 1, the E-shaped retaining ring A is removed from the shaft.

[Problems to be solved by the device]

As shown in FIG. 8, the force by which the pressing tool T presses the pushed protrusion 4 is F, and the contact point between the shaft S and the inner peripheral surface side end 3a is P.
If the distance from the contact point P to the extension line of the pressing force F is l, a moment of F × l is required to elastically deform the E-shaped retaining ring A into a detachable shape.

However, since the shaft S is installed in a narrow space inside the machine, the E-shaped retaining ring A is small, and therefore the distance l is small, so that the E-shaped retaining ring A can be subjected to a detachable elastic deformation. The pressing tool T requires a considerably large pressing force F.

Therefore, it is not easy to remove the E-shaped retaining ring A by extending the pushing tool T into a narrow space and applying a large pushing force F.

The present invention aims to solve the above problems, and provides an E-shaped retaining ring A that can be removed with a smaller pressing force than conventional.

[Means for solving the problem]

In order to achieve the above object, the E-shaped retaining ring of the present invention has an inner peripheral surface fitted in a retaining ring insertion groove formed around a shaft and a space from the inner peripheral surface toward the outer peripheral surface. When the pressing tool presses the tip of the push-out projection for removal formed by the opening surface and the outer peripheral surface, the end portion on the inner peripheral surface side of the opening surface is the above-mentioned. In an E-shaped snap ring in which the distance between the inner peripheral surface side ends elastically expands and is removed from the shaft while slidingly contacting the shaft, the portion of the outer peripheral surface located on the opening surface side is the outer peripheral surface. By forming parallel surfaces having a distance substantially equal to the diameter of the surface, the distance between the two driven projections is made substantially equal to the outer peripheral surface, and the width of the E-shaped retaining ring is not wider than the diameter of the outer peripheral surface. In the range, from the contact point between the inner peripheral surface side end and the shaft to the extension line of the pressing force of the pressing tool Distance is characterized in that it has a maximum.

[Action]

The operation of the E-type retaining ring configured as described above is as follows.

Since the width of the E-shaped retaining ring of the present invention is not larger than the diameter of the outer peripheral surface of the E-shaped retaining ring, the work of attaching to and detaching from the shaft in the narrow space inside the machine is the same as the conventional E-type retaining ring. It's nothing more difficult than a retaining ring.

(Fitting to the shaft) As with the conventional E-shaped snap ring, the opening surface of the E-shaped snap ring is pressed against the groove for inserting the snap ring of the shaft to elastically expand the width of the opening surface for inserting the snap ring. Fit in the groove.

The E-shaped retaining ring of the present invention is more rigid than the conventional E-shaped retaining ring because the portion of the outer peripheral surface located on the side of the opening surface is a parallel surface having a distance substantially equal to the diameter of the outer peripheral surface. Is slightly larger, and therefore the force of fitting on the shaft is slightly larger than the conventional one.

(Removal from the shaft) When the two pressed projections of the E-shaped retaining ring fitted to the shaft are pressed by the pressing tool, the inner peripheral surface side end of the opening surface slides on the shaft and both inner peripheral surfaces The E-shaped retaining ring is disengaged from the shaft when the distance between the side ends elastically expands and becomes equal to the diameter of the shaft.

If the pressing force of the pressing tool is F, the contact point between the inner peripheral surface side end and the shaft is P, and the distance from the contact point P to the extension line of the pressing force is l, it can be removed to the E-type retaining ring. In order to apply elastic deformation, a moment of F × l is required, but in the E-shaped snap ring of the present invention, the distance between the pushed projections is wider than that of the conventional E-shaped snap ring. Therefore, the distance 1 may be larger than that of the conventional E-shaped snap ring and the pressing force F may be smaller than that of the conventional E-shaped snap ring, which facilitates the removal work of the E-shaped snap ring.

〔Example〕

The present invention will be described with reference to the drawings.
The drawing shows a front view of the E-shaped retaining ring A ₁ of the present invention, and FIG. 4 shows its longitudinal sectional view.

The E-shaped retaining ring A ₁ is provided with an opening surface 7 having a wider distance from the inner peripheral surface 10 fitted in the retaining ring insertion groove 1 of the shaft S toward the outer peripheral surface 11, and the outer peripheral surface 11 is opened. A portion located on the surface 7 side is a parallel surface having a distance substantially equal to the diameter of the outer peripheral surface 11.
Since it is formed on the outer peripheral surface 11, the distance between the pushed projections 8 formed at the intersections of the opening surface 7 and the outer peripheral surface 11 is substantially equal to the diameter of the outer peripheral surface 11.

The outer peripheral surface 11 except the parallel surface 11a is semicircular as in the conventional example, but an E-shaped retaining ring A ₁ is provided at a position opposite to the opening surface 7 in this semicircular portion. A concave pushed surface 9 used when fitting to the shaft S is formed.

The concave pushed surface 9 has an effect of preventing the tip of the pressing tool from slipping along the outer peripheral surface 11 when the tip of the pressing tool is pressed.

This concave pushed surface 9 is not essential,
For example, when the shape of the tip of the pressing tool is matched with the contour of the outer peripheral surface 11, the tip of the pressing tool is less likely to slip. Therefore, as shown in FIG. The retaining ring A ₂ may be used.

If the material of the E-type retaining ring A ₁ is spring steel or stainless steel for springs, use the E-type retaining ring A ₃ with the recess 2 on the inner peripheral surface 10 as shown in FIG. But you can
When the material is a plastic material, it is not necessary to provide the hollow 2 on the inner peripheral surface 10.

Since the E-type retaining rings A _{1 to} A ₃ are attached and removed in the same manner, the action of the E-type retaining ring A ₁ will be described with reference to FIG.

Since the width of the E-shaped retaining ring A ₁ is not larger than the diameter of the outer peripheral surface 11, mounting on the shaft S in a narrow space inside the machine,
The removal work is not more difficult than the conventional E-shaped retaining ring A.

(Fitting to Shaft) The fitting method of the E-shaped snap ring A _{1 to} the shaft S is the same as that of the conventional example, and the opposite side of the opening surface 7 of the E-shaped snap ring A ₁ is pressed with a pressing tool (not shown). Pressing the opening surface 7 into the retaining ring insertion groove 1 of the shaft S
When it is pressed against, when the gap of the opening surface 7 pressed by the shaft S expands elastically, and the spacing of the inner peripheral surface end side 7a of the opening surface 7 becomes the same as the diameter of the snap ring insertion groove 1. Then, the snap ring insertion groove 1 passes through the opening surface 7, and after passing, the E-shaped snap ring
Most of the elastic deformation of A ₁ is restored, and E remains due to the remaining elastic force.
The die retaining ring A ₁ is fitted into the retaining ring insertion groove 1.

The E-shaped retaining ring A _{1 has} a shape in which the portion of the outer peripheral surface 11 located on the side of the opening surface 7 is a parallel surface 11a having an interval substantially equal to the diameter of the outer peripheral surface 11, so that the rigidity is the same as that of the conventional E-shaped stopper. Ring A
Is slightly larger than the conventional one, and therefore, the force of fitting on the shaft S is slightly larger than the conventional one.

(Removal from Shaft) In order to remove the E-shaped retaining ring A ₁ fitted on the shaft S from the shaft S, as shown in FIG. When pressed by the pressing portion 6, the inner peripheral surface side end portions 7a of the opening surface 7 are in sliding contact with the shaft S while both inner peripheral surface side end portions are in contact with each other.
The E-shaped retaining ring A ₁ is disengaged from the shaft S when the space of 7a expands elastically and the space becomes equal to the diameter of the shaft S.

When the pressing force of the pressing tool T is F, the contact point between the inner peripheral surface side end portion 7a and the shaft S is P, and the distance from the extension line of the pressing force F of the pressing tool T to the contact point P is l, E Mold retaining ring A ₁ is used as axis S
To remove it further, a moment of F × l is required, but since the E-type retaining ring A ₁ of the present invention has a larger distance l than the conventional E-type retaining ring A ₁ , the E-type retaining ring A ₁ The pressing force F required for elastically deforming to a detachable state is smaller than in the conventional case.

Therefore, although the E-shaped retaining ring A ₁ has the same width as the conventional E-shaped retaining ring A, the work for removing the E-shaped retaining ring A ₁ is easier than that of the conventional one.

[Effect of device]

Since the present invention is constructed as described above,
The width of the die retaining ring is the same as the width of the conventional E retaining ring, and the work of attaching and detaching to the shaft in the narrow space inside the machine can be performed in the same manner as the conventional one.

Although the fitting force of the E-shaped retaining ring on the shaft has increased slightly compared to the conventional model, the pressing force required to remove the E-shaped retaining ring is small, and the E-shaped retaining ring is better than the shaft in a narrow space. It became easier to remove the retaining ring.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a front view of an E type snap ring showing an embodiment of the present invention, and FIG. 2 is an E type showing another embodiment of the present invention. FIG. 3 is a front view of a retaining ring, FIG. 3 is a front view of an E-type retaining ring showing another embodiment of the present invention, FIG. 4 is a vertical sectional view of FIG. 1, and FIG. 6 is a front view of a conventional E-shaped snap ring, FIG. 7 is a vertical sectional view of a conventional E-shaped snap ring fitted to a shaft, and FIG. 8 is a conventional E-shaped snap ring. It is a front view explaining the removal state of a wheel. A, A ₁ , A ₂ ...... E type snap ring, P …… contact point, S …… axis, T
...... Pressing tool, F ... Pressing force, l ... Distance from contact point to extension line of pressing force, 1 ... Retaining ring insertion groove, 7 ... Opening surface, 7a ... Inner peripheral surface of opening surface Side end portions, 8 ... Pushed protrusions, 10 ... Inner peripheral surface, 11 ... Outer peripheral surface, 11a ... Parallel surfaces having a distance substantially equal to the diameter.

Claims (1)

(57) [Scope of utility model registration request] Claim: What is claimed is: 1. An opening surface having an inner peripheral surface fitted into a retaining ring insertion groove formed around a shaft, and an opening surface having a wider interval from the inner peripheral surface toward the outer peripheral surface. The inner peripheral surface side end portion of the opening surface is in sliding contact with the shaft when the tip of the pushing projection for removal formed by the outer peripheral surface and the outer peripheral surface is pressed by the pressing tool. In an E-shaped retaining ring whose end portions are elastically expanded and removed from a shaft, a portion of the outer peripheral surface located on the opening surface side is a parallel surface having a distance substantially equal to the diameter of the outer peripheral surface. By making the space between the both driven projections substantially equal to the outer peripheral surface, the inner peripheral surface side end portion and the shaft can be formed within a range in which the width of the E-shaped retaining ring is not wider than the diameter of the outer peripheral surface. E is characterized by maximizing the distance from the point of contact with the extension line of the pressing force of the pressing tool. The retaining ring.