JP2022041536A - Snap ring removal prevention structure and assembly component - Google Patents

Abstract

To provide a snap ring removal prevention structure which prevents falling of a snap ring from a housing and enables the snap ring to be easily assembled to the housing, and an assembly component.SOLUTION: A snap ring removal prevention structure includes: a housing having a cylindrical part, in which an opening is disposed at one axial side, and including an annular groove formed along an inner peripheral wall of the cylindrical part; a content housed in the cylindrical part; a snap ring which is disposed at the one axial side relative to the content in the cylindrical part and has a C shaped ring part having a gap disposed between both end parts in a shaft circumferential direction and in which the ring part engages with the annular groove so as to prevent the content from coming out from the opening; and a restriction part which is inserted into the gap so as to restrict a diameter of the ring part engaging with the annular groove from shrinking.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a snap ring retaining structure and assembly parts.

For example, in Patent Document 1, a drum having an inner peripheral surface fixed to a transmission case and having an annular groove formed therein, an end plate fixed to the drum so as not to rotate relative to each other, and an end plate so as not to fall off from the drum. Discloses a snap ring engaged in an annular groove, a circular shrinkage limiting portion provided on the end plate that limits the radial inward shrinkage of the snap ring, and a snap ring retaining structure provided. There is.

Japanese Unexamined Patent Publication No. 2018-179175

By the way, in the snap ring retaining structure described in Patent Document 1, since the shrinkage limiting portion limits the shrinkage of the snap ring inward in the radial direction, it is possible to prevent the snap ring from falling off from the annular groove of the drum. It will be possible.

However, in the snap ring retaining structure described in Patent Document 1, when the snap ring is attached to the drum, for example, the snap ring is smaller than the diameter of the annular groove and is reduced against the restoring force of the snap ring. The diameter is reduced so as to be larger than the diameter of the limiting portion, and the snap ring is inserted into the drum while aligning the center position of the snap ring with the center position of the reduction limiting portion. Then, the snap ring is engaged with the annular groove by expanding the diameter of the snap ring by its restoring force. Since the assembly process as described above is required, there is a problem that the snap ring cannot be easily assembled to the drum.

It is an object of the present disclosure to provide a snap ring retaining structure and assembly parts that prevent the snap ring from falling out of the housing and allow the snap ring to be easily assembled to the housing.

In order to achieve the above object, the snap ring retaining structure in the present disclosure is
A housing having a cylindrical portion in which an opening is arranged on one side in the axial direction and an annular groove formed along the inner peripheral wall of the cylindrical portion.
The contents contained in the cylindrical portion and
The cylindrical portion has a C-shaped ring-shaped portion that is arranged on one side in the axial direction with respect to the contents and a gap is arranged between both ends in the axial direction, so that the contents can be removed from the opening. A snap ring in which the ring-shaped portion engages with the annular groove so as to stop,
A limiting portion inserted into the gap so as to limit the diameter of the annular portion engaging with the annular groove, and a limiting portion.
To prepare for.

The assembly parts in this disclosure are
It is provided with the above-mentioned snap ring retaining structure.

According to the present disclosure, the snap ring can be prevented from falling off from the housing and the snap ring can be easily assembled to the housing.

FIG. 1 is an exploded perspective view of an assembled part having a snap ring retaining structure according to an embodiment of the present disclosure. FIG. 2 is a partial cross-sectional view showing a cross section of the snap ring retaining structure according to the embodiment of the present disclosure along the axis. FIG. 3 is a plan view of the bush. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 6 is a plan view of the snap ring. FIG. 7 is a partial perspective view showing the snap ring retaining structure with the housing omitted. FIG. 8 is a plan view showing the snap ring retaining structure with the housing omitted. FIG. 9 is a diagram showing an example of an assembly process of assembled parts. FIG. 10 is a diagram showing an example of an assembly process of assembled parts.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of an assembly part 100 provided with a snap ring retaining structure 100A according to an embodiment of the present disclosure. FIG. 2 is a partial cross-sectional view showing a cross section of the snap ring retaining structure 100A according to the embodiment of the present disclosure along the axis. In FIG. 2, an X-axis and a Y-axis are drawn. In FIG. 2, the left-right direction is referred to as the X direction or the radial direction, the direction away from the Y axis in the X direction is the radial outside or "+ X direction", and the direction close to the Y axis from the X direction is the radial inside or "-X". "Direction". Further, in FIG. 2, the vertical direction is referred to as a Y direction or an axial direction, an upward direction is referred to as one axial direction or "+ Y direction", and a downward direction is referred to as an axial other side or "-Y direction". Further, in FIG. 2, the direction around the Y axis is referred to as an axial direction or a circumferential direction.

As shown in FIGS. 1 and 2, the assembly part 100 has a retaining structure 100A of the snap ring 3. The retaining structure 100A of the snap ring 3 includes a housing 1, a bush 2, a snap ring 3, and a limiting portion 26. In the following description, the annular groove 18 arranged on one side (+ Y direction) in the axial direction of the housing 1 and the snap ring 3 engaged with the annular groove 18 will be described as a representative, and the axial direction of the housing 1 and the like will be described. The description of the annular groove (not shown) arranged on the side (-Y direction) and the snap ring (not shown) engaged with the annular groove will be omitted.

The housing 1 has a cylindrical portion 12. In addition, in FIG. 1 and FIG. 2, the other side (-Y direction) in the axial direction of the cylindrical portion 12 is omitted. An opening 14 is arranged on one side (+ Y direction) of the cylindrical portion 12 in the axial direction. An annular groove 18 is formed in the inner peripheral wall 16 of the cylindrical portion 12 along the circumferential direction. The annular groove 18 has a predetermined depth on the outer side in the radial direction (+ X direction).

FIG. 3 is a plan view of the bush 2. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. As shown in FIGS. 1 to 5, the bush 2 is formed into a shaft shape by a rubber material. The bush 2 is housed in the cylindrical portion 12. The bush 2 has an expansion / contraction portion 22 and a hard portion 24.

The telescopic portion 22 is arranged at the central portion in the axial direction of the bush 2 and can be expanded and contracted in the axial direction (Y direction). On one side (+ Y direction) of the expansion / contraction portion 22 in the axial direction, a connecting portion 23 extending to one side in the axial direction is arranged. On the other side in the axial direction (-Y direction) of the expansion / contraction portion 22, the connecting portion 23 extending to the other side in the axial direction is arranged. Each of the connecting portions 23 has a connecting hole 23a.

The hard portion 24 is arranged on both sides of the telescopic portion 22 in the axial direction. Here, only the hard portion 24 arranged on one side (+ Y direction) of the expansion / contraction portion 22 in the axial direction will be described. The hard portion 24 is harder than the telescopic portion 22. That is, the elastic modulus of the hard portion 24 is smaller than the elastic modulus of the elastic portion 22.

The hard portion 24 has a small diameter surface portion 24a arranged concentrically with each other, an outer peripheral wall portion 24b, a slope portion 24c, and a large diameter surface portion 24d.

The small diameter surface portion 24a faces one side in the axial direction. A through hole 29 is provided in the center of the small diameter surface portion 24a. The connecting portion 23 penetrates through the through hole 29.

The outer peripheral wall portion 24b faces the outside in the radial direction (+ X direction). The axial one-side edge of the outer peripheral wall portion 24b is connected to the radial outer edge of the small-diameter surface portion 24a and extends to the other side in the axial direction (−Y direction). A ring-shaped portion 32 (described later) is fitted onto the outer peripheral wall portion 24b.

The slope portion 24c is connected to the other side edge in the axial direction of the outer peripheral wall portion 24b, and extends in a direction inclined in the other side in the axial direction (−Y direction) with respect to the outside in the radial direction (+ X direction).

The large-diameter surface portion 24d faces one side in the axial direction (+ Y direction). The large-diameter surface portion 24d is connected to the radial outer edge of the slope portion 24c and extends radially outward (+ X direction). The large-diameter surface portion 24d has a larger diameter than the small-diameter surface portion 24a, and is arranged on the other side (−Y direction) in the axial direction from the small-diameter surface portion 24a.

The large-diameter surface portion 24d has a seating portion 25. A ring-shaped portion 32 (described later) is seated on the seating portion 25.

The limiting portion 26 has an inclined portion 27 and a convex portion 28. The inclined portion 27 is connected to the radial outer edge of the small diameter surface portion 24a, and extends in a direction in which the inclined portion 27 is inclined to the other side in the axial direction with respect to the radial outer side.

The convex portion 28 faces one side in the axial direction. The convex portion 28 is connected to the radial outer edge of the inclined portion 27 and extends radially outward. The convex portion 28 is arranged so as to project in one axial direction (+ Y direction) from the axial direction (Y direction) of the seating portion 25. The convex portion 28 is integrally formed with the seating portion 25 (hard portion 24).

FIG. 6 is a plan view of the snap ring 3. FIG. 7 is a partial perspective view showing the housing 1 omitted in the snap ring retaining structure 100A. FIG. 8 is a plan view showing the housing 1 omitted in the snap ring retaining structure 100A. As shown in FIGS. 6 to 8, the snap ring 3 is arranged on one side (+ Y direction) in the axial direction with respect to the bush 2 in the cylindrical portion 12. The snap ring 3 has a C-shaped ring-shaped portion 32. In the ring-shaped portion 32, a gap 36 is arranged between the circumferential ends 34a and 34b.

The ring-shaped portion 32 engages with the annular groove 18 so as to prevent the bush 2 from coming out of the opening 14 (see FIG. 2). As described above, the ring-shaped portion 32 is fitted onto the outer peripheral wall portion 24b and is seated on the seating portion 25 (large diameter surface portion 24d).

A convex portion 28 is inserted into the gap 36 of the snap ring 3. As a result, the ring-shaped portion 32 is restricted from being reduced in diameter. In other words, each of the circumferential ends 28a and 28b of the convex portion 28 abuts on the circumferential ends 34a and 34b of the annular portion 32 to limit the diameter reduction of the annular portion 32.

Next, the assembly process of the assembly component 100 according to the embodiment of the present disclosure will be described with reference to FIGS. 2, 9 and 10. 9 and 10 are views showing an example of an assembly process of the assembly part 100. In the description of the assembly process of the assembly component 100, the annular groove 18 arranged on one side (+ Y direction) in the axial direction of the housing 1 and the snap ring 3 engaged with the annular groove 18 will be described as a representative. The description of the annular groove (not shown) arranged on the other side (-Y direction) of the housing 1 in the axial direction and the snap ring (not shown) engaging with the annular groove will be omitted.

First, the bush 2 is housed in the housing 1.

Next, as shown in FIG. 9, a load in the axial direction (Y direction) is input to the bush 2, and a space for the snap ring 3 to enter the housing 1 from the opening 14 is created.

Next, the connecting portion 23 of the bush 2 is passed through the ring-shaped portion 32 of the snap ring 3. Further, the ring-shaped portion 32 is reduced in diameter from the diameter of the inner peripheral wall 16 of the housing 1 and is inserted into the housing 1 through the opening 14.

Next, as shown in FIG. 10, the snap ring 3 is attached. In other words, the ring-shaped portion 32 is engaged with the annular groove 18. When attaching the snap ring 3, the axial position of the snap ring 3 and the axial position of the annular groove 18 are aligned. The position of the convex portion 28 in the circumferential direction and the position of the gap 36 in the circumferential direction are aligned with each other.

Next, the axial load on the bush 2 is removed. As a result, as shown in FIG. 2, the ring-shaped portion 32 is seated on the seating portion 25, and the convex portion 28 is inserted into the gap 36.

As a result, the assembly process of the assembly component 100 is completed. By inserting the convex portion 28 into the gap 36, the diameter of the ring-shaped portion 32 is not reduced, so that the snap ring 3 is prevented from coming off. As a result, the bush 2 is prevented from falling off from the housing 1.

The snap ring retaining structure 100A in the above embodiment has a cylindrical portion 12 in which an opening 14 is arranged on one side in the axial direction, and an annular groove 18 is formed along the inner peripheral wall 16 of the cylindrical portion 12. The housing 1, the bush 2 housed in the cylindrical portion 12, and the C-shaped ring-shaped portion 32 arranged on one side of the bush 2 in the cylindrical portion 12 in the axial direction and having a gap 36 between both ends in the axial direction. The snap ring 3 in which the annular portion 32 engages with the annular groove 18 and the annular portion 32 engaged in the annular groove 18 are restricted in diameter so as to prevent the bush 2 from coming out of the opening 14. A limiting portion 26, which is inserted into the gap 36 so as to be provided, is provided.

With the above configuration, the annular portion 32 is inserted into the housing 1 while being reduced in diameter, the axial position of the annular portion 32 and the axial position of the annular groove 18 are aligned, and the annular portion 32 is engaged with the annular groove 18. At the same time, the limiting portion 26 is inserted into the gap 36 by aligning the circumferential position of the gap 36 with the circumferential position of the limiting portion 26. As a result, since the diameter of the snap ring 3 is not reduced, the snap ring 3 can be easily assembled to the housing 1.

The bush 2 has a seating portion 25 on which the ring-shaped portion 32 is seated, and the limiting portion 26 is a convex portion protruding axially unilaterally from the axial position of the seating portion 25 so as to be inserted into the gap 36. Has 28. As a result, when the ring-shaped portion 32 is seated on the seating portion 25, the convex portion 28 is inserted into the gap 36. This also makes it possible to easily assemble the snap ring 3 to the housing 1.

Each of the circumferential ends 28a and 28b of the convex portion 28 abuts on each of the circumferential ends 34a and 34b of the annular portion 32 so as to limit the diameter reduction of the annular portion 32. This makes it possible to reliably prevent the ring-shaped portion 32 from shrinking in diameter.

When the convex portion 28 is integrally formed with the seating portion 25. As a result, the number of parts is reduced, so that the manufacturing cost can be reduced. Further, the same effect can be obtained even if the convex portion 28 is formed as a separate part from the seating portion 25 and fixed to the seating portion 25 by welding or fastening.

The bush 2 is arranged on the other side in the axial direction of the bush 2 and can be expanded and contracted in the axial direction. , And the convex portion 28 and the seating portion 25 are arranged on the hard portion 24. As a result, since the convex portion 28 and the seating portion 25 are hard, the convex portion 28 and the like are not easily deformed, the diameter reduction amount of the ring-shaped portion 32 is small, and the diameter reduction of the ring-shaped portion 32 is more reliably prevented. Is possible.

According to the above embodiment, the convex portion 28 of the limiting portion 26 and the seating portion 25 of the bush 2 are integrally formed. In other words, the limiting portion 26 and the bush 2 are integrally formed. The present disclosure is not limited to this, and may be a separate body. In this case, the limiting portion 26 is arranged on one side in the axial direction with respect to the bush 2.

Further, according to the above embodiment, the content housed in the housing 1 is the bush 2, but the present disclosure is not limited to this, for example, the content housed in the housing 1 and prevented from falling off by the snap ring 3. Anything may be used as long as it is a thing.

In addition, the above embodiments are merely examples of the embodiment of the present disclosure, and the technical scope of the present disclosure should not be construed in a limited manner by these. .. That is, the present disclosure can be implemented in various forms without departing from its gist or its main characteristics.

The present disclosure is suitably used for assembly parts having a snap ring retaining structure that prevents the snap ring from falling out of the housing and is required to easily assemble the snap ring to the housing.

1 housing 2 bush
3 Snap ring 12 Cylindrical part 14 Opening part 16 Inner peripheral wall 18 Circular groove 22 Telescopic part 23 Connecting part 23a Connecting hole 24 Hard part 24a Small diameter surface part 24b Outer peripheral wall part 24c Slope part 24d Large diameter surface part 25 Seating part 26 Restriction part 27 Part 28 Convex part 28a, 28b Circumferential end 29 Through hole 32 Ring-shaped part
34a, 34b Circumferential end 36 Gap 100 Assembly parts 100A Snap ring retaining structure

Claims (6)

A housing having a cylindrical portion in which an opening is arranged on one side in the axial direction and an annular groove formed along the inner peripheral wall of the cylindrical portion.
The contents contained in the cylindrical portion and
The cylindrical portion has a C-shaped ring-shaped portion that is arranged on one side in the axial direction with respect to the contents and a gap is arranged between both ends in the axial direction, so that the contents can be removed from the opening. A snap ring in which the ring-shaped portion engages with the annular groove so as to stop,
A limiting portion inserted into the gap so as to limit the diameter of the annular portion engaging with the annular groove, and a limiting portion.
Snap ring retaining structure. The content has a seating portion on which the ring-shaped portion is seated.
The limiting portion has a convex portion that projects axially to one side of the axial position of the seating portion so as to be inserted into the gap.
The snap ring retaining structure according to claim 1. Both ends in the axial direction of the convex portion abut on both ends in the axial direction of the annular portion so as to limit the diameter reduction of the annular portion.
The snap ring retaining structure according to claim 2. The convex portion is formed integrally with the seating portion.
The snap ring retaining structure according to claim 2 or 3. The contents have a cushioning bush and
The bush is
An elastic part that is arranged on the other side in the axial direction of the bush and can be expanded and contracted in the axial direction,
A hard portion that is arranged on one side in the axial direction of the telescopic portion and is harder than the telescopic portion, and a hard portion.
Equipped with
The convex portion and the seating portion are arranged on the hard portion.
The snap ring retaining structure according to any one of claims 2 to 4. The snap ring retaining structure according to any one of claims 1 to 5 is provided.
Assembly parts.

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