CN217002849U - Dust-proof sealing structure - Google Patents

Abstract

The utility model relates to a dust seal structure, which aims to install a dust seal device more simply. The dust seal structure (1) includes a dust seal device (2) and an annular groove (3) for mounting the dust seal device. The groove (3) is provided in an opening (5) of the housing (4) through which the opening (P) passes. The rod (6) of the shock absorber passes through the opening (P). The dust seal device (2) includes an elastic body portion (10) and a coil spring (20) attached to the elastic body portion. The elastic body portion (10) has a base portion (11) and a seal lip (12) protruding outward from the base portion (11). A coil spring (20) is attached to the base (11). The trough (3) can accommodate the base (11) and has an inlet surface (31) and a support surface (32). The inlet surface is an annular surface continuous with the outer opening surface (51) of the opening (5), and the support surface is an annular surface continuous with the inner opening surface (52) of the opening (5). The inlet face is inclined outwardly.

Description

Dust-proof sealing structure

Technical Field

The present invention relates to a dust seal structure, and more particularly to a dust seal structure for sealing a space between a reciprocating shaft and a housing opening through which the shaft passes.

Background

Conventionally, a suspension device of a vehicle is provided with a damper for suppressing vibration of a vehicle body. The shock absorber includes a cylindrical housing and a shaft inserted into the housing and supported by the housing so as to be capable of reciprocating, and generates a damping force by the action of a fluid in the housing to stabilize the vehicle body. In such a damper, a dust seal device is used to seal a space around a shaft and prevent foreign matter such as muddy water, rainwater, dust, etc. from entering an internal space. Specifically, a dust seal device is provided to seal the interior of the housing so as to seal a space between the shaft and the opening of the housing through which the shaft passes.

In a conventional dust seal device used for a mono-tube type shock absorber, there is a dust seal device formed of a rubber-like elastic material, and such a dust seal device is attached to an annular groove formed in an opening portion of a housing.

SUMMERY OF THE UTILITY MODEL

Problems to be solved by the utility model

In conventional annular grooves to which a dust seal device is attached, there are grooves having a rectangular cross-sectional shape, and dust seal devices attached to these grooves have been known. The attachment of the dust seal device made of the rubber-like elastic material to the groove is performed by pressing the dust seal device from the outside of the case to the opening portion, but the work of attaching the dust seal device to the groove having the rectangular cross section as described above sometimes takes a long time. Therefore, conventionally, a dust seal structure including a dust seal device and an annular groove for mounting an opening portion of the dust seal device is required to have a structure capable of simplifying mounting of the dust seal device to the annular groove.

The utility model provides a dust seal structure capable of more simply mounting a dust seal device.

Means for solving the problems

In order to achieve the above object, a dust seal structure according to the present invention is a dust seal structure for sealing a space between a reciprocating shaft and an opening of a housing through which the shaft passes, the dust seal structure including: a dust seal device; and an annular groove provided in an opening portion of the housing through which the opening passes, the dust seal device being mounted in the groove, the dust seal device including: an elastic body portion which is an elastic body annularly arranged around an axis; and a coil spring attached to the elastic body portion and having a ring shape around the axis, the elastic body portion including: a base portion that is an annular portion; and a seal lip which is an annular portion protruding from the base portion toward one side in the axial direction, wherein the coil spring is attached to the base portion, the groove is capable of accommodating the base portion, and has an inlet surface and a support surface, the inlet surface is an annular surface which is continuous with a surface of the opening portion facing the opening on one side in the axial direction, the support surface is an annular surface which is continuous with a surface of the opening portion facing the opening on the other side in the axial direction, and the inlet surface is inclined toward one side in the axial direction.

Effect of utility model

According to the dust seal structure of the present invention, the dust seal device can be mounted more easily.

Drawings

Fig. 1 is a sectional view showing a one-side cross section along an axis of a dust seal structure according to an embodiment of the present invention.

Fig. 2 is a sectional view of a section of the dust seal device along the axis in the dust seal configuration shown in fig. 1.

Fig. 3 is a sectional view of a groove in the dust seal structure shown in fig. 1, taken along an axis.

Fig. 4 is a sectional view of a shock absorber including a dust seal configuration in an embodiment of the utility model, taken along an axis.

Fig. 5 is a cross-sectional view of a dust seal device according to a modification of the dust seal device according to the embodiment of the present invention, the cross-section being taken along an axis.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a sectional view showing a one-side cross section along an axis x of a dust seal structure 1 according to an embodiment of the present invention, and fig. 1 shows a state where the dust seal structure 1 is attached to a groove 3. Fig. 2 is a sectional view of a section of the dust seal device 2 along the axis x in the dust seal structure 1 shown in fig. 1, and fig. 3 is a sectional view of a section of the groove 3 along the axis x in the dust seal structure 1 shown in fig. 1. In fig. 3, the vicinity of the groove 3 of the housing of the shock absorber is shown. Hereinafter, for convenience of explanation, the direction of the arrow a (see fig. 1) in the axis x direction (one side in the axis x direction) is set to the outside, and the direction of the arrow b (see fig. 1) in the axis x direction (the other side in the axis x direction) is set to the inside. The inner side is specifically the side where the object to be sealed is located, and the outer side is specifically the atmosphere side. In a direction perpendicular to the axis x (hereinafter, also referred to as "radial direction"), a direction away from the axis x (direction of arrow c in fig. 1) is an outer peripheral side, and a direction toward the axis x (direction of arrow d in fig. 1) is an inner peripheral side. In addition, the axis x is a virtual line.

The dust seal structure 1 in the embodiment of the present invention is used to seal a space between a shaft that reciprocates and a housing opening through which the shaft passes. The dust seal structure 1 is used, for example, for a mono-tube type shock absorber of a suspension device of a vehicle, and as described later, seals a space between a rod as a shaft and an opening portion of a housing. The dust seal structure 1 is not limited to a mono-tube type shock absorber for a suspension device of a vehicle.

As shown in fig. 1 to 3, a dust seal structure 1 according to an embodiment of the present invention includes a dust seal device 2 and an annular groove 3 to which the dust seal device 2 is attached. The groove 3 is provided in the one-cylinder type damper, specifically, in the opening 5 of the housing 4 through which the opening P passes. A rod 6 as a damper of the shaft passes through the opening P (see fig. 4). The dust seal device 2 includes: an elastic body portion 10 which is an elastic body annular around an axis x; and a coil spring 20 mounted on the elastic body portion 10 and having a ring shape about the axis x. The elastic body portion 10 includes: a base 11, which is a ring-shaped portion; and a seal lip 12 which is an annular portion projecting outward (arrow a direction side) from the base portion 11. The coil spring 20 is mounted to the base 11. The tank 3 can house the base 11 and has an inlet surface 31 and a support surface 32. The inlet surface 31 is an annular surface that is continuous on the outside with a surface (outside opening surface 51) of the opening 5 facing the opening P. The support surface 32 is an annular surface that is continuous on the inside with a surface (inside opening surface 52) of the opening 5 facing the opening P. The inlet face 31 is inclined outward. The dust seal structure 1 will be specifically described below.

As described above, the dust seal device 2 includes the base 11 and the seal lip 12, and further includes the coil spring 20 attached to the base 11. As shown in fig. 1 and 2, the base portion 11 is, for example, an annular or substantially annular portion having an axis x as a central axis or a substantially central axis, and a cross section along the axis x (hereinafter, also simply referred to as "cross section") has a rectangular-like shape. Specifically, the base 11 has a pressing surface 13 and a supported surface 14 as a pair of surfaces facing away from each other in the x-axis direction. The pressing surface 13 is a surface located outside the supported surface 14. The base 11 has an outer peripheral side surface 15, and the outer peripheral side surface 15 is an annular surface connected to an outer peripheral end of the pressing surface 13 and an outer peripheral end of the supported surface 14. As shown in fig. 2, the outer peripheral side surface 15 is, for example, a curved surface that protrudes outward, and in the illustrated example, the outer portion in the cross section protrudes outward, and has a protruding portion 15a that is a portion protruding outward. An outer peripheral end 11a, which is a portion on the outer peripheral side of the base 11, is configured to be receivable in the groove 3.

The seal lip 12 extends from the base portion 11, for example, as shown in fig. 2, from an end portion on the inner peripheral side of the base portion 11. As shown in fig. 1 and 2, the seal lip 12 is a cylindrical portion extending along the axis x, and has, for example, a conical cylindrical surface or a substantially conical cylindrical surface having the axis x as a central axis or a substantially central axis on an inner peripheral side surface and an outer peripheral side surface, respectively. As shown in fig. 2, the cross-sectional shape of the seal lip 2 is a trapezoidal or substantially trapezoidal cross-sectional shape having a radial width that increases from the end on the base portion 11 side toward the end on the outer side. The seal lip 12 has a seal lip tip portion 16 formed in the shock absorber so as to be able to contact the rod 6, and the seal lip tip portion 16 is formed at an outer end portion (tip portion 12a) of the seal lip 12. The seal lip tip portion 16 is a portion that protrudes inward on the tip portion 12a of the seal lip 12.

As shown in fig. 1 and 2, the cross section of the seal lip distal end portion 16 projects in a V-shape or substantially V-shape toward the inner peripheral side so as to form an end portion on the inner peripheral side (lip distal end 16 a). The seal lip tip portion 16 extends annularly about the axis x, and the lip tip portion 16a extends along a line that describes a circle or a substantial circle centered or substantially centered on the axis x.

The elastic body portion 10 is a member integrally formed of the same material, and the base portion 11 and the seal lip 12 are portions of the elastic body portion 10 integrally formed. The elastic body 10 is, for example, a rubber-like elastic body.

Specifically, as shown in fig. 1 and 2, the coil spring 20 is mounted inside the base 11. The coil spring 20 is embedded in the outer peripheral end portion 11a of the base portion 11, for example. The entire coil spring 20 may be embedded in the outer peripheral end portion 11a of the base 11, or a part of the coil spring 20 may be embedded in the outer peripheral end portion 11a of the base 11. The coil spring 20 is, for example, vulcanization bonded to the base 11. In this case, for example, the dust seal 2 is integrally vulcanization molded together with the coil spring 20, whereby the coil spring 20 is vulcanization bonded to the base portion 11. The coil spring 20 is provided to apply a force to the base portion 11, the force pressing the outer peripheral end portion 11a of the base portion 11 against the groove 3.

As described above, the groove 3 is provided in the opening 5 of the housing 4 of the mono-tube type shock absorber. The housing 4 is specifically a cylindrical housing, and an opening 5 is provided in a disc-shaped portion at one end of the housing 4. The opening 5 forms an opening P through which the rod 6 passes. The opening 5 has an outer opening surface 51 at a position outside the groove 3, and an inner opening surface 52 at a position inside the groove 3. The outer opening surface 51 is a cylindrical surface or a substantially cylindrical surface having the axis x as a center axis or a substantially center axis, and the inner opening surface 52 is a cylindrical surface or a substantially cylindrical surface having the axis x as a center axis or a substantially center axis.

The groove 3 is provided between the outer opening surface 51 and the inner opening surface 52, and the groove 3 is a groove recessed toward the outer periphery side from the outer opening surface 51 and recessed toward the outer periphery side from the inner opening surface 52. The groove 3 has an inlet surface 31 and a support surface 32, and has a bottom surface 33, and the bottom surface 33 is an annular surface connected to an outer peripheral end of the inlet surface 31 and an outer peripheral end of the support surface 32.

Specifically, as shown in fig. 3, inlet face 31 is inclined outward with respect to a virtual plane passing through an end portion (outer peripheral end 31a) on the outer peripheral side of inlet face 31 and orthogonal to axis x. The inlet surface 31 is, for example, reduced in diameter toward the outside in the axis x direction. Specifically, for example, as shown in fig. 3, the inlet surface 31 is a conical cylindrical surface or a substantially conical cylindrical surface extending along the axis x. For example, the inlet surface 31 is a conical cylindrical surface or a substantially conical cylindrical surface having the axis x as a central axis or a substantially central axis.

For example, as shown in fig. 3, the support surface 32 is a circular or substantially circular ring extending along a virtual plane orthogonal to the axis x, and specifically, for example, extends parallel or substantially parallel to a virtual plane orthogonal to the axis x. For example, as shown in fig. 3, the bottom surface 33 is a cylindrical surface extending along the axis x, and specifically, is a cylindrical surface or a substantially cylindrical surface having the axis x as a central axis or a substantially central axis. As shown in fig. 3, the diameter d1 of the end portion on the inner peripheral side of the inlet surface 31 is larger than the diameter d2 of the end portion on the inner peripheral side of the support surface 32. That is, the support surface 32 is further expanded to the inner peripheral side than the inlet surface 31. The diameter of the outer opening surface 51 of the opening 5 is larger than the diameter of the inner opening surface 52.

The base 11 of the dust seal 2 is able to contact the inlet face 31 and the support face 32 of the tank 3. For example, a width w1 (see fig. 2) of the outer peripheral end 11a of the base 11 in the direction of the axis x is smaller than a distance (width w2) between the inner peripheral end of the inlet face 31 and the support face 32 in the direction of the axis x (see fig. 3). Thereby, the supported surface 14 of the base 11 can be in contact with the supporting surface 32 of the groove 3, and the end portion (outer peripheral end 13a) on the outer peripheral side of the pressing surface 13 of the base 11 can be in contact with the inlet surface 31. Further, the diameter of the end portion on the outer peripheral side of the protruding portion 15a of the outer peripheral side surface 15 of the base 11 is larger than the diameter of the bottom surface 33 of the groove 3.

As shown in fig. 1, in the dust seal structure 1, a dust seal device 2 is attached to a groove 3. Specifically, the outer peripheral end 11a of the base 11 of the dust seal device 2 is housed in the groove 3, and the dust seal device 2 is fixed to the groove 3. As described above, since the supported surface 14 of the base 11 can contact the supporting surface 32 of the groove 3, in the dust seal structure 1, the supported surface 14 of the base 11 contacts the supporting surface 32 of the groove 3, and the base 11 is supported by the supporting surface 32 of the groove 3. Further, the outer peripheral end 13a of the pressing surface 13 of the base 11 contacts the inlet surface 31. In this way, in the dust seal structure 1, the outer peripheral end 13a of the pressing surface 13 of the base 11 contacts the inlet surface 31, the supported surface 14 of the base 11 contacts the supporting surface 32 of the groove 3, and the base 11 is sandwiched between the inlet surface 31 and the supporting surface 32 of the groove 3.

Further, since the diameter of the end portion on the outer peripheral side of the protruding portion 15a on the outer peripheral side surface 15 of the base 11 is larger than the diameter of the bottom surface 33 of the groove 3, the protruding portion 15a on the outer peripheral side surface 15 of the base 11 is pressed against the bottom surface 33 of the groove 3 in the dust seal structure 1. Further, since the coil spring 20 is embedded in the outer peripheral end portion 11a of the base portion 11, the projecting portion 15a of the outer peripheral side surface 15 of the base portion 11 is also pressed against the bottom surface 33 of the groove 3 by the force of the coil spring 20.

In this way, in the dust seal structure 1, the outer peripheral end portion 11a of the base portion 11 is sandwiched between the inlet surface 31 and the support surface 32 of the groove 3, and the outer peripheral end portion 11a of the base portion 11 is pressed against the bottom surface 33 of the groove 3 by the elastic force due to compression and the force of the coil spring 20. Further, the portion near the outer peripheral end 13a of the pressing surface 13 of the base 11 is pressed against the entrance surface 31 of the groove 3 by the elastic force due to the compression of the outer peripheral end 11a of the base 11 and the force of the coil spring 20, and the base 11 is further pressed against the support surface 32 of the groove 3 by the reaction force. In this way, the base 11 is firmly fixed to the tank 3. Further, since at least a part of the coil spring 20 overlaps the entrance surface 31 of the groove 3 when viewed in the direction x of the axis, the base 11 is less likely to be detached from the groove 3 by the coil spring 20.

On the other hand, when the dust seal device 2 is attached to the groove 3, the dust seal device 2 is press-fitted into the opening P of the opening 5 and the dust seal device 2 is press-fitted into the groove 3, but since the inlet surface 31 of the groove 3 is inclined outward, the base 11 is guided by the inlet surface 31 when the base 11 is attached to the groove 3. Therefore, the work of attaching the base 11 to the groove 3 is facilitated. The diameter of the outer opening surface 51 is larger than that of the inner opening surface 52, and the diameter of the end portion on the inner peripheral side of the inlet surface 31 of the groove 3 is larger than that of the end portion on the inner peripheral side of the support surface 32. This also facilitates the work of attaching the base 11 to the groove 3. In this way, the dust seal structure 1 can firmly fix the dust seal device 2 to the groove 3 and can simplify the attachment of the dust seal device 2 to the groove 3.

As described above, according to the dust seal structure 1 of the embodiment of the present invention, the dust seal device 2 can be more easily attached to the groove 3.

Next, the operation of the dust seal structure 1 having the above-described structure will be described. Fig. 4 is a sectional view of a cross section along the axis x of the monotube type shock absorber 100 including the dust seal structure 1. Fig. 4 shows a structure in the vicinity of the dust seal structure 1. In fig. 4, the damper 100 is shown with the rod 6 removed, and the rod 6 is indicated by a two-dot chain line.

As shown in fig. 4, the dust seal structure 1 is provided in a cylindrical housing 4, specifically, in an opening 5 provided at the center or substantially the center of an end of the housing 4. Further, an opening P through which a rod 6 supported to be capable of reciprocating passes is formed in the opening portion 5, and the rod 6 passes through the opening portion 5.

As described above, the outer peripheral end 11a of the base portion 11 of the dust seal device 2 is attached to the groove 3 formed in the opening portion 5, and the dust seal device 2 is fixed to the housing 4. In the damper 100, the seal lip tip portion 16 of the seal lip 12 is in contact with the outer peripheral surface 6a of the rod 6 so that the rod 6 can slide. This seals the dust seal device 2 and the rod 6 outside the inner opening 52 of the opening 5, and prevents foreign matter such as muddy water, rainwater, dust, and the like from entering the housing 4 from the outside.

Next, a description will be given of the dust seal device 7 according to a modification of the dust seal device 1. Fig. 5 is a cross-sectional view of a dust seal 7 according to a modification of the dust seal 1, the cross-section being taken along the axis x. Fig. 5 shows only one side of the cross section of the dust seal 7. The dust seal device 2 is different in structure of the outer peripheral side of the tip end portion of the seal lip of the dust seal device 7 and is different in that a coil spring 8 as a coil spring is provided. Hereinafter, the dust seal 7 will be described with respect to a structure having the same or similar function as the dust seal 2, using the same reference numerals, omitting the description thereof, and a different structure will be described.

As shown in fig. 5, the dust seal 7 has a seal lip 17, and the outer peripheral side portion of the outer end (tip side) of the seal lip 17 has a shape different from that of the seal lip 12 of the dust seal 2. An annular groove 17b recessed inward is formed in a surface facing the outer peripheral side of a tip portion 17a which is an outer end portion of the seal lip 17. The groove 17b can receive the coil spring 8. Further, an annular protrusion 17c protruding outward is formed at a portion adjacent to the groove 17b on the outer side of the surface facing the outer peripheral side of the distal end portion 17 a. The coil spring 8 can be prevented from falling off from the seal lip 17 by the protruding portion 17 c.

As shown in fig. 5, in the dust seal device 7, a coil spring 8 is attached to a groove 17b of a seal lip 17, and a tightening force as a force for tightening a rod 6 is applied to a seal lip tip 16 of the seal lip 17 by the coil spring 8. Therefore, in the shock absorber 100 provided with the dust seal structure having the dust seal device 7, the sealing performance of the seal lip can be improved by the pressing force of the coil spring 8, and the dust-proof performance as the performance of preventing foreign matters from entering the housing 4 can be improved.

The embodiments of the present invention have been described above, but the present invention is not limited to the dust seal structure of the above-described embodiments of the present invention, and includes all the embodiments included in the concept of the present invention and the claims. In order to achieve at least part of the above-described problems and effects, the respective structures may be selectively combined as appropriate. For example, the shape, material, arrangement, dimensions, and the like of each member in the above embodiments can be appropriately changed according to a specific use mode of the present invention.

The application target of the dust seal structure of the present invention is not limited to the above-described one-cylinder type shock absorber, and the dust seal structure of the present invention can be applied to all or some of various vehicles, general-purpose machines, and the like that can use the present invention.

Description of the symbols

1 … dustproof sealing structure

2. 7 … dustproof sealing device

3 … groove

4 … casing

5 … opening part

6 … rod

6a … outer peripheral surface

8 … coil spring

10 … elastomeric body

11 … base

11a … outer peripheral end portion

12. 17 … sealing lip

12a, 17a … tip end portion

13 … pressing surface

14 … supported surface

15 … peripheral side surface

15a … projection

16 … seal lip tip end

16a … lip tip

17b … groove

17c … projection

20 … spiral spring

31 … inlet face

31a … outer peripheral end

32 … bearing surface

33 … bottom surface

51 … outer opening surface

52 … inner side opening surface

100 … shock absorber

d1, d2 … diameter

Opening of P …

w1, w2 … Width

The x … axis.

Claims (15)

1. A dust seal structure for effecting sealing of a space between a reciprocating shaft and an opening of a housing through which the shaft passes, the dust seal structure characterized by comprising:

a dust seal device; and

an annular groove provided in an opening portion of the housing through which the opening passes, the dust seal device being mounted in the groove,

the dust sealing device includes: an elastic body portion which is an elastic body annular around an axis; and a coil spring mounted to the elastic body portion and having a ring shape around the axis,

The elastic body portion includes: a base portion that is an annular portion; and a seal lip which is an annular portion protruding from the base portion toward one side in the axial direction,

the coil spring is mounted to the base portion,

the trough is capable of receiving the base and has an inlet face and a support face,

the inlet surface is an annular surface that is continuous with a surface of the opening portion facing the opening on one side in the axial direction,

the support surface is an annular surface that is continuous with a surface of the opening portion facing the opening on the other side in the axial direction,

the inlet is inclined to face one side in the axial direction.

2. The dust seal structure according to claim 1,

the inlet surface is inclined to one side in the axial direction with respect to a plane passing through an end portion of the inlet surface on the outer peripheral side and perpendicular to the axis.

3. The dust seal structure according to claim 1,

the inlet surface is reduced in diameter toward one side in the axial direction.

4. The dust seal structure according to claim 3,

the inlet face is a conical or substantially conical cylinder face extending along the axis.

5. The dust seal structure according to claim 1,

the base is contactable with the inlet face and the support face.

6. The dust seal structure according to claim 1,

the width in the axial direction of the end portion on the outer peripheral side of the base portion is smaller than the interval in the axial direction between the end portion on the inner peripheral side of the inlet face and the support face.

7. The dust seal structure according to claim 1,

the diameter of the end portion on the inner peripheral side of the inlet surface is larger than the diameter of the end portion on the inner peripheral side of the support surface.

8. The dust seal structure according to claim 1,

the coil spring is embedded in an outer peripheral portion of the base.

9. The dust seal structure according to claim 8,

the coil spring is vulcanization bonded to the base.

10. The dust seal structure according to claim 1,

the bearing surface extends along a plane orthogonal to the axis.

11. The dust seal structure according to claim 1,

the base portion has a pair of faces facing away in the axial direction,

The other surface of the pair of surfaces of the base portion in the axial direction is in contact with the support surface.

12. The dust seal structure according to claim 1,

the seal lip extends from a portion on the inner peripheral side of the base portion.

13. The dust seal structure according to claim 1,

the groove has a bottom surface which is an annular surface connected to an outer peripheral end of the inlet surface and an outer peripheral end of the support surface.

14. The dust seal structure according to claim 1,

the dust seal device includes another coil spring that applies a tightening pressure to the seal lip, the tightening pressure being a force that tightens the shaft,

the other coil spring is mounted to the seal lip.

15. The dust seal structure according to claim 1,

the groove is provided in an opening portion of a housing of the mono-tube shock absorber.

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