CN220134610U - Rotary seal and seal structure - Google Patents

Abstract

The utility model provides a rotary seal and a seal structure, which can adjust the pressing force of a seal lip part relative to a shaft. The rotary seal (1) according to the present utility model comprises: a reinforcing ring (2) which is an annular member; and an elastic body part (3) which is mounted on the reinforcing ring (2) and is formed by an annular elastic body. The elastic body part (3) has a sealing lip (40), and the sealing lip (40) has a sealing lip. The reinforcing ring (2) has a spring portion (10), an outer peripheral portion (20), and an inner peripheral portion (30). The outer peripheral portion (20) is an annular portion. The inner peripheral portion (30) is an annular portion and is located on the inner peripheral side of the outer peripheral portion (20). The spring portion (10) is an annular portion and extends between the outer peripheral portion (20) and the inner peripheral portion (30). The seal lip (40) is attached to the inner peripheral portion (30). The spring part (10) is elastically deformable in the radial direction.

Description

Rotary seal and seal structure

Technical Field

The present utility model relates to rotary seals and seal structures.

Background

Conventionally, in order to seal between a shaft and a hole through which the shaft is inserted, a rotary seal such as an oil seal has been used. Such rotary seals have an elastomer portion formed of an elastomer, and further have a reinforcing ring formed of a metal. The reinforcing ring imparts rigidity to the elastic body in order to stably fix the rotary seal. The sealing lip of the elastic body portion has elasticity to be in stable contact with the shaft. In the conventional rotary seal, there is a rotary seal provided with a retainer spring in order to improve the following performance of the seal lip portion with respect to the shaft. The retainer spring presses the lip tip portion of the seal lip against the shaft, and applies a pressing force against the seal lip to move the seal lip along with the vibrating shaft, the inclined shaft, or the like (for example, refer to patent document 1).

Prior art literature

Patent literature

Patent document 1: japanese patent publication No. 3278349.

Disclosure of Invention

Problems to be solved by the utility model

The pressing force of the seal lip is set to a predetermined value according to specifications such as the shape, size, material, and the like of the retainer spring. Therefore, in order to change the range of displacement of the shaft that the seal lip can follow, it is necessary to change the range to a different-sized garter spring. In this way, the conventional rotary seal cannot adjust the pressing force of the seal lip without changing the constituent members. Therefore, in the conventional rotary seal, a structure capable of adjusting the pressing force of the seal lip against the shaft is required.

The present utility model has been made in view of the above-described problems, and an object thereof is to provide a rotary seal and a seal structure capable of adjusting a pressing force of a seal lip against a shaft.

Means for solving the problems

The rotary seal according to the present utility model is a seal device for sealing between a shaft and a hole into which the shaft is inserted, comprising: a reinforcing ring which is a ring-shaped member around the axis; and an elastic body portion attached to the reinforcing ring and formed of an elastic body having a ring shape around the axis, the elastic body portion having a sealing lip, the reinforcing ring having: an outer peripheral portion which is annular around the axis; an inner peripheral portion which is located on the inner peripheral side of the outer peripheral portion and is annular about the axis; and a spring portion extending between the outer peripheral portion and the inner peripheral portion and having an annular shape around the axis, the seal lip portion being attached to the inner peripheral portion, the spring portion being elastically deformable in a radial direction.

In the rotary seal according to one aspect of the present utility model, a cross section of the spring portion along the axis is wavy.

In the rotary seal according to one aspect of the present utility model, the spring portion has at least one curved portion that is curved so as to protrude in the direction of the axis, and the curved portion extends annularly around the axis.

In the rotary seal according to one aspect of the present utility model, the spring portion has at least one side bent portion that protrudes to one side in the direction of the axis, and at least one other side bent portion that protrudes to the other side in the direction of the axis, and the one side bent portion and the other side bent portion are alternately arranged in the radial direction.

In the rotary seal according to one embodiment of the present utility model, the outer peripheral portion extends along the axis.

In the rotary seal according to one aspect of the present utility model, an end portion of the outer peripheral portion on one side in the axial direction is connected to the spring portion, and the outer peripheral portion has a portion with a reduced diameter toward an end portion on the other side in the axial direction.

In the rotary seal according to one aspect of the present utility model, the elastic body portion includes a gasket portion that contacts the hole, the seal lip portion and the gasket portion are separate from each other, and a portion of the gasket portion on at least one end portion side covers the outer peripheral portion from an outer peripheral side.

In the rotary seal according to one aspect of the present utility model, the elastic body portion includes a cover portion that covers the other end portion of the outer peripheral portion.

In the rotary seal according to one aspect of the present utility model, the inner peripheral portion extends along the axis.

In the rotary seal according to one aspect of the present utility model, an end portion of the inner peripheral portion on the other side in the direction of the axis is connected to the spring portion, and a thickness of the inner peripheral portion becomes thinner toward the end portion on the one side in the direction of the axis.

In the rotary seal according to one aspect of the present utility model, the lip tip end portion of the seal lip portion is located near the one end portion of the inner peripheral portion.

In the rotary seal according to one aspect of the present utility model, a lip tip portion of the seal lip portion faces away from the one end portion of the inner peripheral portion in the radial direction.

In the rotary seal according to one embodiment of the present utility model, the seal lip has a dust lip.

In the rotary seal according to one aspect of the present utility model, a direction along the axis toward the lip tip end side in the seal lip portion is opposite to a direction along the axis toward an end portion on the side not connected to the spring portion in the outer peripheral portion.

In the rotary seal according to one aspect of the present utility model, the thickness of the spring portion is set so that the pressing force of the seal lip portion against the shaft becomes a predetermined value.

The present utility model relates to a sealing structure for sealing between a shaft and a hole into which the shaft is inserted, the sealing structure comprising: a rotary seal is provided with: a reinforcing ring which is a ring-shaped member around the axis; and an elastic body portion mounted to the reinforcing ring and formed of an elastic body having a ring shape around the axis; a support member that supports the rotary seal from one side in the direction of the axis in the hole; and a pressing member that presses the rotary seal from the other side in the direction of the axis in the hole, the elastic body portion having a seal lip, the reinforcing ring having: an outer peripheral portion which is annular around the axis; an inner peripheral portion which is located on the inner peripheral side of the outer peripheral portion and is annular about the axis; and a spring portion extending between the outer peripheral portion and the inner peripheral portion and having an annular shape around the axis, the seal lip portion being attached to the inner peripheral portion, the spring portion being elastically deformable in a radial direction, the outer peripheral portion extending along the axis and being connected to the spring portion at one end portion, the pressing member pressing the other end portion of the outer peripheral portion along the axis.

In the seal structure according to one aspect of the present utility model, the pressing member is a member having a ring shape around the axis line, and has a surface capable of directly or indirectly contacting the other end portion of the outer peripheral portion.

In the seal structure according to one aspect of the present utility model, the support member is a member having an annular shape around the axis, and has a surface that maintains a position of the outer peripheral portion in the direction of the axis in the hole.

In the seal structure according to one aspect of the present utility model, the surface of the support member directly or indirectly contacts the one end portion of the outer peripheral portion.

In the seal structure according to one aspect of the present utility model, the surface of the support member is in direct or indirect contact with a portion where the outer peripheral portion and the spring portion are connected.

In the seal structure according to one aspect of the present utility model, a cross section of the spring portion along the axis is wavy.

In the seal structure according to one aspect of the present utility model, the spring portion has at least one curved portion that is curved so as to protrude in the direction of the axis, and the curved portion extends annularly around the axis.

In the seal structure according to one aspect of the present utility model, the spring portion has at least one side bent portion and at least one other side bent portion, the one side bent portion is a bent portion protruding toward the one side, the other side bent portion is a bent portion protruding toward the other side, and the one side bent portion and the other side bent portion are alternately arranged in the radial direction.

In the seal structure according to one aspect of the present utility model, the outer peripheral portion has a portion having a reduced diameter toward the other end portion.

In the seal structure according to one aspect of the present utility model, the elastic body portion includes a gasket portion that contacts the hole, the seal lip portion and the gasket portion are separate from each other, and a portion of the gasket portion on at least the one end portion side covers the outer peripheral portion from the outer peripheral side.

In the seal structure according to one aspect of the present utility model, the elastic body portion includes a cover portion that covers the other end portion of the outer peripheral portion.

In the seal structure according to one aspect of the present utility model, the inner peripheral portion extends along the axis, the other end portion is connected to the spring portion, and the thickness of the inner peripheral portion becomes thinner toward the one end portion.

In the seal structure according to one aspect of the present utility model, a direction along the axis toward the lip tip end side in the seal lip portion is opposite to a direction along the axis toward an end portion on the side not connected to the spring portion in the outer peripheral portion.

In the seal structure according to one aspect of the present utility model, the thickness of the spring portion is set so that the pressing force of the seal lip portion against the shaft becomes a predetermined value.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the rotary seal and the seal structure of the present utility model, the pressing force of the seal lip against the shaft can be adjusted.

Drawings

Fig. 1 is a sectional view taken along an axis for illustrating a brief structure of a rotary seal according to an embodiment of the present utility model.

Fig. 2 is an end view showing a side of the rotary seal shown in fig. 1 with respect to an axis in cross section.

Fig. 3 is a sectional view taken along an axis for illustrating a brief structure of a seal structure according to an embodiment of the present utility model.

Fig. 4 is a cross-sectional view showing one side of the cross-section of the sealing structure shown in fig. 3 with respect to an axis.

Fig. 5 is a diagram showing a case where a force is generated in the reinforcing ring when a force toward the sealing side is applied to an end portion of the outer peripheral portion of the reinforcing ring.

Detailed Description

Hereinafter, embodiments of the present utility model will be described with reference to the drawings.

Fig. 1 is a sectional view of a cross section along an axis x for illustrating a schematic structure of a rotary seal 1 according to an embodiment of the present utility model, and fig. 2 is an end view illustrating one side of the cross section of the rotary seal 1 illustrated in fig. 1 with respect to the axis x. The rotary seal 1 according to the embodiment of the present utility model is a seal device that seals between a shaft and a hole through which the shaft is inserted. The cross section shown in fig. 1 is a cross section of a plane including the axis x. The rotary seal 1 is a sealing device for achieving sealing between a shaft and a hole into which the shaft is inserted. The rotary seal 1 is used, for example, to seal a space between a shaft that rotates about an axis of a vehicle, a general-purpose machine, or the like and a through hole of a housing through which the shaft is inserted. For example, the shaft rotates about an axis as a central axis, and a sealing object such as lubricating oil or lubricant is present in the housing. In the following description, it is assumed that the rotary seal 1 is mounted between a shaft that rotates about the axis x and a through hole of a housing through which the shaft is inserted, and seals the inside of the housing. The application target of the rotary seal 1 is not limited to this specific example, and the rotary seal 1 can be applied to various machines, devices, mechanisms, and the like.

As shown in fig. 1 and 2, the rotary seal 1 includes: the reinforcing ring 2 is a ring-shaped member around the axis x; and an elastic body portion 3 which is attached to the reinforcing ring 2 and is formed of an elastic body having a ring shape around the axis x. The elastomeric portion 3 has a sealing lip 40, said sealing lip 40 having a sealing lip. The reinforcing ring 3 has a spring portion 10, an outer peripheral portion 20, and an inner peripheral portion 30. The outer peripheral portion 20 is a portion annular about the axis x. The inner peripheral portion 30 is a portion having an annular shape around the axis x, and is located on the inner peripheral side of the outer peripheral portion 20. The spring portion 10 is a portion having an annular shape around the axis x, and extends between the outer peripheral portion 20 and the inner peripheral portion 30. The seal lip 40 is mounted to the inner peripheral portion 30. The spring portion 10 is elastically deformable in the radial direction. Hereinafter, the structure of the rotary seal 1 will be specifically described. Further, the radial direction is a direction orthogonal to the axis x. The inner peripheral side is the axis x side in the radial direction, and is the side in the arrow c direction in fig. 1, and the outer peripheral side is the side opposite to the axis x side in the radial direction, and is the arrow d direction side in fig. 1.

As shown in fig. 1 and 2, the reinforcing ring 2 has a pair of facing-away faces 2a, 2b, the faces 2a, 2b representing the contour of the reinforcing ring 2 in cross section. The spacing between the faces 2a and 2b is the thickness of the stiffener ring 2.

As shown in fig. 1 and 2, the shape of the spring portion 10 in a cross section along the axis x (hereinafter, also simply referred to as a cross-sectional shape) is, for example, wavy. Since the spring portion 10 has such a wavy cross-sectional shape, the spring portion 10 can be elastically deformed in the radial direction. The spring portion 10 has, for example, at least one bent portion 11, and the bent portion 11 is a portion that is bent so as to protrude in the direction of the axis x. The curved portion 11 extends annularly about the axis x. As shown in fig. 1 and 2, specifically, for example, the spring portion 10 has at least one seal-side bent portion 12 as one-side bent portion, the seal-side bent portion 12 being a bent portion 11 protruding toward one side in the direction of the axis x, and at least one atmosphere-side bent portion 13 as the other-side bent portion, the atmosphere-side bent portion 13 being a bent portion 11 protruding toward the other side in the direction of the axis x. The seal-side bent portions 12 and the atmosphere-side bent portions 13 are alternately arranged in the radial direction. One side in the direction of the axis x is a direction toward the sealing object side in a use state of the rotary seal 1 to be described later, in which the rotary seal 1 is attached to the application object, and the other side in the direction of the axis x is a direction toward the atmosphere side in a use state of the rotary seal 1. As shown in fig. 1, with respect to the rotary seal 1, the arrow a direction is one side in the direction of the axis x and is a direction toward the object side to be sealed (hereinafter, also referred to as "sealing side"), and the arrow b direction is the other side in the direction of the axis x and is a direction toward the atmosphere side (hereinafter, also referred to as "atmosphere side").

As shown in fig. 1 and 2, specifically, for example, the spring portion 10 has two bent portions 11, and as shown in fig. 2, one of the two bent portions 11 is a seal-side bent portion 12, and one of the two bent portions 11 is an atmosphere-side bent portion 13. The atmosphere-side bent portion 13 is provided on the outer peripheral side of the seal-side bent portion 12. As shown in fig. 2, the cross-sectional shape of the seal-side bent portion 12 is bent from the inner peripheral side toward the outer peripheral side toward the atmosphere side along the cross-sectional shape of the seal-side bent portion 12. As shown in fig. 2, the cross-sectional shape of the air-side bent portion 13 is bent from the inner peripheral side toward the outer peripheral side toward the seal side along the cross-sectional shape of the air-side bent portion 13. The seal-side bent portion 12 and the atmosphere-side bent portion 13 can be elastically deformed in a more bent and flatter manner.

As shown in fig. 2, the connecting portion 14a expands in diameter from the atmosphere side toward the seal side, and the connecting portion 14a is a portion of the spring portion 10 on the inner peripheral side of the seal side bent portion 12. As shown in fig. 2, the connecting portion 15a is widened from the sealing side to the atmosphere side, and the connecting portion 15a is a portion between the sealing side bent portion 12 and the atmosphere side bent portion 13 of the spring portion 10. As shown in fig. 2, the connecting portion 14b expands in diameter from the atmosphere side toward the seal side, and the connecting portion 14b is a portion of the spring portion 10 on the outer peripheral side of the atmosphere side bent portion 13.

Since the spring portion 10 has the bent portion 11 in this way, the spring portion can elastically expand and contract in the radial direction by the deformation of the bent portion 11. Further, the rigidity of the spring portion 10 is improved by the bent portion 11. The spring portion 10 may have a plurality of seal-side bent portions 12 and atmosphere-side bent portions 13, respectively. In this case, the same structure as that of a part or all of the above-described connection portion 14a, seal-side bent portion 12, connection portion 15a, atmosphere-side bent portion 13, and connection portion 14b is repeatedly formed in the radial direction. The spring portion 10 may have only one bent portion 11, that is, may have only one seal-side bent portion 12 or atmosphere-side bent portion 13.

As shown in fig. 2, the thickness of the cross section of the spring portion 10 is constant or substantially constant, for example, throughout the spring portion 10. The thickness of the cross section of the spring portion 10 is set to a predetermined value, for example, in a state in which the rotary seal 1 described later is used, the pressing force of the seal lip 40 against the shaft. Further, the thickness of the cross section of the spring portion 10 may not be constant throughout the spring portion 10. For example, the thickness of the cross section of the bent portion 11 may be thicker or thinner than the thickness of the cross section of the other portion of the spring portion 10.

As shown in fig. 1 and 2, the outer peripheral portion 20 extends along the axis x, and the outer peripheral portion 20 is connected to the spring portion 10 at, for example, the end on the sealing side. Specifically, the outer peripheral portion 20 is connected to an outer peripheral end of the connecting portion 14b of the spring portion 10 at a seal-side end. As shown in fig. 2, the cross-sectional shape of the outer peripheral portion 20 is, for example, an arc shape or an arc shape protruding toward the outer peripheral side. Further, for example, as shown in fig. 2, the outer peripheral portion 20 has a separation portion 22, and the separation portion 22 is a portion whose diameter decreases toward the end (end 21) on the atmosphere side. The separation portion 22 is separated from the inner peripheral surface of the through hole to the inner peripheral side in a use state of the rotary seal 1 described later. For example, as shown in fig. 2, the cross-sectional shape of the separation portion 22 is a tapered shape, and the thickness of the cross-section of the separation portion 22 becomes thinner toward the end portion 21. The thickness of the other portion of the outer peripheral portion 20 is, for example, constant or substantially constant throughout the portion.

As shown in fig. 1 and 2, the inner peripheral portion 30 extends along the axis x, and the inner peripheral portion 30 is connected to the spring portion 10 at an end on the atmosphere side, for example. Specifically, the inner peripheral portion 30 is connected to an end portion on the inner peripheral side of the connecting portion 14a of the spring portion 10 at an end portion on the atmosphere side. As shown in fig. 2, the cross-sectional shape of the inner peripheral portion 30 is, for example, an arc or circular arc protruding toward the inner peripheral side, and an end 31 as an end on the sealing side or a vicinity of the end 31 is located at the innermost peripheral side in the radial direction. In this way, the inner peripheral portion 30 is reduced in diameter toward the end portion 31 or the vicinity of the end portion 31. For example, as shown in fig. 2, the cross-sectional shape of the inner peripheral portion 30 is a tapered shape, and the thickness of the cross-section of the inner peripheral portion 30 becomes thinner toward the end portion 31.

The reinforcing ring 2 is integrally formed of the same material, and the spring portion 10, the outer peripheral portion 20, and the inner peripheral portion 30 are integrally formed portions of the reinforcing ring 2, and are integrally connected. The reinforcing ring 2 is made of, for example, metal, and examples of the metal material of the reinforcing ring 2 include stainless steel and SPCC (cold rolled steel). The reinforcing ring 2 is manufactured by, for example, press working or forging a plate-like metal material. The material of the reinforcing ring 2 is not limited to metal, and may be any material that can elastically expand and contract in the radial direction. For example, the reinforcing ring 2 may be made of resin.

As described above, the seal lip 40 has a seal lip, and a seal lip is formed. As shown in fig. 2, the seal lip 40 has a lip front end 41. The seal lip 40 has a lip tip 41, for example, in the vicinity of the seal-side end (end 40 a) of the seal lip 40. The lip distal end 41 is an annular portion protruding toward the inner peripheral side, has a predetermined amount of interference with respect to the shaft, and contacts the outer peripheral surface of the shaft in a use state of the rotary seal 1 described later. As shown in fig. 1 and 2, the seal lip 40 is attached to the inner peripheral portion 30 and extends along the axis x. The lip tip 41 of the seal lip 40 is located near the end 31 of the inner peripheral portion 30, for example. Specifically, for example, as shown in fig. 2, the lip tip portion 41 of the seal lip 41 faces radially away from the end portion 31 of the inner peripheral portion 30. The sealing lip 40 has, for example, a dust lip 42. For example, as shown in fig. 2, the dust lip 42 is formed at the end of the seal lip 40 on the atmosphere side, and extends toward the atmosphere side and the inner peripheral side.

As shown in fig. 2, the direction along the axis x toward the lip tip 41 side in the seal lip 40 is opposite to the direction along the axis x toward the end 21 in the outer peripheral portion 20. That is, the direction from the atmosphere-side end of the seal lip 40 toward the seal-side end 40a is opposite to the direction from the seal-side end of the outer peripheral portion 20 toward the atmosphere-side end 21.

As shown in fig. 1 and 2, the elastic body 3 further includes a gasket portion 50, for example. The gasket portion 50 covers the outer peripheral portion 20 from the outer peripheral side. That is, the washer portion 50 is mounted on the surface 2a of the outer peripheral portion 20. For example, the gasket portion 50 covers at least a part of the outer peripheral portion 20 from the outer peripheral side. The gasket portion 50 covers the outer peripheral portion 20 from the outer peripheral side, for example, at least at a portion on the end portion side of the sealing side. Specifically, for example, as shown in fig. 1 and 2, the gasket portion 50 is attached to the surface 2A at the transition portion 2c of the reinforcing ring 2. The transition portion 2a of the reinforcing ring 2 is a portion where the connection portion 14b of the spring portion 10 is connected to the outer peripheral portion 20 and a portion in the vicinity thereof. In the use state of the rotary seal 1 described later, the gasket portion 50 is sandwiched between the inner peripheral surface of the through hole and the outer peripheral portion 20, and is attached to the reinforcing ring 2 so as to be pressed against the inner peripheral surface of the through hole.

As shown in fig. 1 and 2, the elastic body 3 further includes a cover 60, for example. The cover 60 covers the end 21 of the outer peripheral portion 20. The elastic body 3 may not have the cover 60.

As shown in fig. 1 and 2, the seal lip 40, the gasket 50, and the cover 60 of the elastic body 3 are separated from each other. The seal lip 40 and the gasket 50 may be integrally connected to each other without being separated from each other. The gasket portion 50 and the cover portion 60 may be integrally connected to each other without being separated from each other. The seal lip 40, the gasket 50, and the cover 60 may be integrally connected to each other without being separated from each other.

Examples of the elastic body portion 3 include various rubber materials. Examples of the various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and Fluororubber (FKM). The seal lip portion 40, the gasket portion 50, and the cover portion 60 of the elastic body portion 3 are formed by cross-linking (vulcanization) forming using a forming die, for example. For example, in the cross-linking molding, the reinforcing ring 2 is placed in a molding die, and the seal lip 40, the gasket 50, and the cover 60 of the elastic body 3 are bonded to the reinforcing ring 2 by cross-linking adhesion, whereby the elastic body 3 and the reinforcing ring 2 are integrally molded. The elastic body of the elastic body portion 3 is not limited to the rubber material described above. The seal lip 40, the gasket 50, and the cover 60 may not be formed of the same elastic material.

Next, a sealing structure 4 according to an embodiment of the present utility model will be described. Fig. 3 is a sectional view taken along the axis x for illustrating a schematic structure of the seal structure 4 according to the embodiment of the present utility model. Fig. 4 is a sectional view showing one side of the section of the sealing structure 4 shown in fig. 3 with respect to the axis x. Fig. 3 shows a use state of the sealing structure 4 in which the sealing structure 4 is mounted to the applicable object. Further, the cross section shown in fig. 3 is a cross section of a plane containing the axis x. In fig. 3, a housing 100 and a shaft 110 of a machine, a device or a mechanism are shown as an example of an application object of the seal structure 4. The housing 100 and the shaft 110 are, for example, housings and shafts of general-purpose machines, devices, or mechanisms of vehicles, or the like. As shown in fig. 3, the shaft 110 is inserted through the through-hole 101 of the housing 100, and an annular space 102 is formed between the shaft 110 and the through-hole 101. The shaft 110 is supported by a bearing 103 so as to be rotatable in the housing 100. The sealing structure 4 is provided in the space 102, and seals the space 102. The object to which the seal structure 4 is applied is not limited to this.

The seal structure 4 includes the rotary seal 1, the support member 5, and the pressing member 6. The support member 5 is a member that supports the rotary seal 1 from the sealing side in the through hole 101. The pressing member 6 presses the rotary seal 1 from the atmosphere side through the through hole 101. The pressing member 6 presses the end 21 of the outer peripheral portion 20 of the reinforcing ring 2 of the rotary seal 1 along the axis x. The support member 5 supports the rotary seal 1 by pressing against the pressing member 6. The structure of the sealing structure 4 will be specifically described below. As described above, the seal structure 4 includes the rotary seal 1, and in the use state of the seal structure 4, the rotary seal 1 is attached to the application object, and the rotary seal 1 is also in the use state.

For example, as shown in fig. 3 and 4, the support member 5 is a member having a ring shape around the axis x, and has a support surface 5a. The support surface 5a is maintained at the position of the outer peripheral portion 20 of the rotary seal 1 in the direction of the axis x in the through hole 101. The support surface 5a of the support member 5 is in direct or indirect contact with the sealing-side end of the outer peripheral portion 20 or the transition portion 2c between the outer peripheral portion 20 and the spring portion 10.

The support member 5 is not movable relative to the inner peripheral surface 101a of the through hole 101 in the x-axis direction. The support member 5 is, for example, a member that can be fixed to the inner peripheral surface 101a of the through hole 101. Specifically, for example, the support member 5 is pressed into the through hole 101 and fixed to the inner peripheral surface 101a. In this case, the inner peripheral surface 101a also becomes a constituent of the seal structure 4. Instead, specifically, for example, the support member 5 is accommodated in an annular groove 101b formed in the inner peripheral surface 101a of the through hole 101, and is fixed to the inner peripheral surface 101a. In this case, the groove 101b also becomes a constituent of the seal structure 4. The support member 5 may be an endless annular member, or may be an endless annular member such as a clip.

As shown in fig. 3 and 4, the support surface 5a of the support member 5 is a plane or a surface included in a substantially plane, for example, and extends parallel or substantially parallel to a plane orthogonal to the axis x. The support member 5 has, for example, a side surface 5b, and the side surface 5b faces away from the support surface 5a. The side surface 5b is, for example, a surface parallel or substantially parallel to the support surface 5a.

In the illustrated example, the support member 5 is press-fitted and fixed to the through hole 101, and in the use state, the outer peripheral surface 5c of the support member 5 is pressed against the inner peripheral surface 101a of the through hole 101. The outer peripheral surface 5c is a surface of the support member 5 facing the outer peripheral side. The side surface 5b is in contact with the bearing 103, for example, from the atmosphere side. In this way, in the use state, the position of the support member 5 in the axis x direction is fixed to the inner peripheral surface 101a of the through hole 101. Further, the bearing surface 5a of the bearing member 5 faces the sealing side in the use state. As described above, the support member 5 may be a member separate from the housing 100, or may be integrally formed with the inner peripheral surface 101a of the through hole 101 of the housing 100.

As shown in fig. 3 and 4, the pressing member 6 is, for example, a member having a ring shape around the axis x, and has a through hole 6c. The pressing member 6 has a pressing surface 6a that can directly or indirectly contact with the end 21 of the outer peripheral portion 20 of the rotary seal 1. The pressing surface 6a is a surface facing the sealing side, for example, a surface included in a plane or a substantially plane, and extends parallel or substantially parallel to a plane orthogonal to the axis x. The through hole 6c has a size through which the shaft 110 passes. The pressing surface 6a is sized to be accommodated in the space 102 in a state where the shaft 110 passes through the through hole 6c. The pressing member 6 has a mounting surface 6b on the outer peripheral side of the pressing surface 6a, for example, and the mounting surface 6b is an annular surface. As shown in fig. 4, the mounting surface 6b is located on the atmosphere side of the pressing surface 6a in the axis x direction, and a step is formed between the mounting surface and the pressing surface 6a. The mounting surface 6b is a surface facing the sealing side. The mounting surface 6b is, for example, a plane or a plane included in a substantially plane, and extends parallel or substantially parallel to a plane orthogonal to the axis x. The attachment surface 6b faces the side surface 104 of the housing 100 extending outside the through hole 101. An annular washer 6d is attached to the attachment surface 6 b. Further, the gasket 6d may not be attached to the attachment surface 6 b. The pressing member 6 further includes a fixing member 6e for fixing the pressing member 6 to the housing 100. The fixing member 6e is, for example, a bolt. The fixing member 6e is fixed to the housing 100 through, for example, a through hole 6f formed in the pressing member 6, thereby fixing the pressing member 6 to the housing 100. When the fixing member 6e is a bolt, the fixing member 6e is screwed into the bolt hole 104a formed in the side surface 104 of the housing 100, and the pressing member 6 is fixed to the housing 100. The pressing member 6 may have a plurality of fixing members 6e, or may have one fixing member 6e. The pressing member 6 is provided with a number of through holes 6f corresponding to the fixing members 6e.

Next, the operation of the rotary seal 1 and the seal structure 4 having the above-described structure will be described. As shown in fig. 3 and 4, the seal structure 4 is provided between the housing 100 and the shaft 110, and is in a use state.

As shown in fig. 3 and 4, the support member 5 is fixed to the through hole 101 of the housing 100 in the use state, and the side surface 5b contacts the bearing 103 from the atmosphere side. In this way, the position of the support member 5 in the axis x direction is fixed in the through hole 101.

As shown in fig. 3 and 4, the rotary seal 1 is fitted in a through hole 101 formed in the housing 100 in a use state. In the through-hole 101 of the housing 100, a space between the outer peripheral surface 111 of the shaft 110 and the inner peripheral surface 101a of the through-hole 101 is sealed by the rotary seal 1. Specifically, the rotary seal 1 is fitted into the through hole 101, the gasket portion 50 is compressed between the outer peripheral portion 20 of the reinforcing ring 2 and the inner peripheral surface 101a of the through hole 101, and the gasket portion 50 is pressed against the inner peripheral surface 101a of the through hole 101. Thereby, the seal between the rotary seal 1 and the through hole 101 is achieved on the outer peripheral side. The lip tip 41 of the seal lip 40 of the elastic body 20 is slidably in contact with the outer peripheral surface 111 of the shaft 110. Thereby, sealing between the rotary seal 1 and the shaft 110 is achieved on the inner peripheral side. This can prevent leakage of the sealing object such as the lubricant oil or the lubricant stored in the casing 100 to the outside. As shown in fig. 3 and 4, in the use state, the dust lip 42 is slidably in contact with the outer peripheral surface 111 of the shaft 110, and foreign matter can be prevented from entering the inside from the outside of the housing 100.

As shown in fig. 3 and 4, the gasket portion 50 of the rotary seal 1 is in contact with the support surface 5a of the support member 5 from the atmosphere side. Thereby, the rotary seal 1 is supported by the support member 5 from the sealing side in the direction of the axis x. In addition, in the case where the gasket portion 50 is not formed to the transition portion 2c of the reinforcing ring 2, the transition portion 2c of the reinforcing ring 2 or the sealing-side end portion of the outer peripheral portion 20 of the reinforcing ring 2 is in contact with the support surface 5a of the support member 5.

As shown in fig. 3 and 4, the pressing member 6 is fixed to the housing 100 in the use state. In the use state, the shaft 110 passes through the through hole 6c, and the shaft 110 protrudes outside the housing 100. The mounting surface 6b faces the side surface 104 of the housing 100 via the gasket 6 d. The pressing member 6 is fixed to the housing 100 by a plurality of bolts 6e as fixing members 6e, for example. The pressing member 6 may be fixed to the housing 100 by an adhesive or the like. By the fixation with the fixing member 6e, the washer 6d is compressed between the mounting surface 6b of the pressing member 6 and the side surface 104 of the housing 100. Thereby, foreign matter can be prevented from entering between the pressing member 6 and the housing 100.

As shown in fig. 3 and 4, in the use state, the pressing surface 6a enters the space 102, contacts the cover 60, and presses the end 21 of the outer peripheral portion 20 of the reinforcing ring 2 toward the seal side in the direction of the axis x. As a result, a force (pressing force F) of magnitude F toward the sealing side in the direction of the axis x is applied to the end portion 21 of the outer peripheral portion 20. The protruding amount g (see fig. 4) as the distance in the x-axis direction between the pressing surface 6a and the mounting surface 6b is adjusted to a predetermined value. Specifically, in the use state, the protruding amount g is adjusted by the pressing member 6 so that the end 21 of the outer peripheral portion 20 of the reinforcing ring 2 is pressed toward the seal side by a desired amount in the direction of the axis x.

As described above, the seal structure 4 is mounted to the housing 100 and the shaft 110, and is in a use state. In the illustrated example, the axis of the shaft 110 coincides with the axis x of the seal structure 4 in the use state, and the axis of the shaft 110 is the axis x. Further, the axis of the shaft 110 may not coincide with the axis x of the rotary seal 1.

As described above, in the use state, the end portion 21 of the outer peripheral portion 20 of the reinforcing ring 2 is pressed toward the seal side in the direction of the axis x with the pressing force F of the magnitude F. On the other hand, the end portion of the outer peripheral portion 20 on the sealing side is supported by the support member 5 via the gasket portion 50, and cannot move to the sealing side. Therefore, the outer peripheral portion 20 is deformed in a further curved manner, and a part of the surface 2a of the outer peripheral portion 20 is pressed against the inner peripheral surface 101a of the through hole 101. By this reaction force, a force (pressing force F1) of magnitude F1 directed radially inward is generated at the end 31 of the inner peripheral portion 30 of the reinforcing ring 2 or in the vicinity of the end 31. By the pressing force F1, the seal lip 40 is pressed against the outer peripheral surface 111 of the shaft 110. In this way, a pressing force (pressing force F1) based on the pressing force F pressing the end portion 21 of the outer peripheral portion 20 is applied to the pressing force of the seal lip 40 against the shaft 110.

The pressing force based on the pressing force F pressing the end portion 21 of the outer peripheral portion 20 can be adjusted by adjusting the pressing force F. Since the pressing force F for pressing the end portion 21 of the outer peripheral portion 20 changes according to the amount by which the end portion 21 of the outer peripheral portion 20 is pressed by the pressing member 6 to move toward the sealing side in the direction of the axis x, the pressing force of the sealing lip 40 can be adjusted by adjusting the amount of movement of the end portion 21 of the outer peripheral portion 20 (the amount of movement toward the sealing side in the direction of the axis x). Specifically, for example, the pressing force (pressing force F1) of the seal lip 40 can be adjusted by adjusting the amount of entrance α (see fig. 4), which is the distance in the direction of the axis x between the pressing surface 6a of the pressing member 6 and the side surface 104 of the housing 100. For example, the amount of penetration α can be adjusted by adjusting the amount of screwing the bolt 6e as the fixing member 6e into the housing 100. For example, a plurality of pressing members 6 having different protruding amounts g may be prepared, and the amount of penetration α may be adjusted by selecting the pressing member 6.

Fig. 5 shows the application of the end portion 21 of the outer peripheral portion 20 of the reinforcing ring 2 in the direction of the axis xA diagram of the situation of the forces generated in the reinforcement ring 2 when the forces of magnitude F are directed towards the sealing side. F as shown in FIG. 5 _N ＝F _a11 +F _b2 。In addition, F _b2 =sin ψ·fb=sin ψ·cos θ·f. Thus, the first and second substrates are bonded together, a certain attenuation occurs in the force via the seal-side bent portion 12 and the atmosphere-side bent portion 13. Since the damping coefficient K is K < 1, the pressing force F1 (F _N ' is->Due to->The changes of psi and theta are small, so that +.>Regarded as a constant, F _N ' proportional to F. From this, it is apparent that the pressing force F applied to the end portion 21 of the outer peripheral portion 20 of the reinforcing ring 2 can adjust the pressing force F1 (F _N '). That is, it is known that the pressing force F applied to the end portion 21 of the outer peripheral portion 20 of the reinforcing ring 2 can adjust the pressing force generated by the seal lip 41.

As described above, according to the rotary seal 1 according to the embodiment of the present utility model, the pressing force of the seal lip 40 against the shaft 110 can be adjusted. Further, according to the seal structure 4 according to the embodiment of the present utility model, the pressing force of the seal lip 40 against the shaft 110 can be adjusted.

As described above, the cross-sectional shape of the spring portion 10 is wavy, and the reinforcing ring 2 is elastically deformable in the radial direction. Therefore, the elasticity and toughness of the reinforcing ring 2 can be improved by the spring portion 10. Accordingly, even when the shaft 110 is displaced greatly, the seal lip 40 can follow the shaft 110, and the pressing force of the seal lip 40 against the shaft 110 can be maintained, or the reduction in the pressing force of the seal lip 40 against the shaft 110 can be suppressed. In this way, the spring portion 10 can improve the following performance of the seal lip 40 with respect to the shaft 110, and can improve the sealing performance. Further, by adjusting the thickness of the spring portion 10, the elasticity, toughness, and rigidity of the reinforcing ring 2 can be adjusted to desired elasticity, toughness, and rigidity.

As described above, the cross-sectional shape of the inner peripheral portion 30 of the reinforcing ring 2 is tapered, and the thickness of the cross-section of the inner peripheral portion 30 becomes thinner toward the end portion 31. Therefore, the flexibility in the radial direction of the inner peripheral portion 30 is high, and the variation of the shaft 110 can be quickly followed. This allows the seal lip 40 to quickly follow the movement of the shaft 110. In this way, the rotary seal 1 can improve the following performance of the seal lip 40 with respect to the shaft 110, and thus can improve the sealing performance of the rotary seal 1.

Further, the shape of the rotary seal 1 can ensure the strength and rigidity required for the rotary seal 1 while reducing the mass of the rotary seal 1. Therefore, the stability of the sealing structure of the rotary seal 1 can be improved.

Further, as described above, according to the rotary seal 1 and the seal structure 4, a plurality of rotary seals 1 of different specifications are prepared, and the rotary seal 1 is selected, whereby it is not necessary to adjust the pressing force of the seal lip 40 against the shaft 110. Furthermore, the rotary seal 1 has no clamping spring. Therefore, the number of components of the rotary seal 1 can be reduced, the productivity can be improved, and the cost can be reduced.

Further, in the case where the end portion 21 of the outer peripheral portion 20 of the reinforcing ring 2 is covered with the cover portion 60, it is possible to prevent other rotary seals 1 or other members from being damaged when a plurality of rotary seals 1 are overlapped or when the rotary seals 1 are attached or detached. In this way, the cover 60 facilitates handling of the rotary seal 1.

The present utility model has been described above by way of the above embodiments, but the technical scope of the present utility model is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or modifications can be made to the above-described embodiments. It is apparent from the description of the claims that such changes and modifications are also included in the technical scope of the present utility model.

The embodiments described above are for easy understanding of the present utility model, and are not intended to limit the explanation of the present utility model. The above embodiments are not limited to the use object of the present utility model, and the present utility model can include all objects as the use object. The components and their arrangement, materials, conditions, shapes, sizes, and the like in the above embodiments are not limited to those exemplified, and can be appropriately changed. For example, the present utility model includes differences in implementation of manufacturing tolerances and the like. The constituent elements shown in the different embodiments may be partially replaced or combined within a range not contradictory in technology. The respective structures can be appropriately and selectively combined to achieve at least some of the above-described problems and effects.

Symbol description

1: rotary seal

2: reinforcing ring

2a, 2b: flour with a plurality of grooves

2c: transition portion

3: elastomer part

4: sealing structure

5: support member

5a: bearing surface

5b: side surface

5c: an outer peripheral surface

6: pressing member

6a: pressing surface

6b: mounting surface

6c: through hole

6d: gasket ring

6e: fixing component

6f: through hole

10: spring part

11: bending part

12: sealing side bending part

13: atmospheric side bending part

14a, 14b, 15a: connecting part

20: peripheral portion

21: end portion

22: separation part

30: inner peripheral portion

31: end portion

40: sealing lip

40a: end portion

41: lip front end

50: gasket part

60: cover part

100: shell body

101: through hole

101a: an inner peripheral surface

101b: groove(s)

102: space of

103: bearing

104: side surface

110: shaft

111: an outer peripheral surface

F. F1: pressing force

g: protrusion amount

x: shaft

Alpha: amount of entry

Claims (29)

1. A rotary seal for effecting a seal between a shaft and a bore into which the shaft is inserted, the rotary seal comprising:

a reinforcing ring which is a ring-shaped member around the axis; and

an elastic body part mounted on the reinforcing ring and formed of an elastic body having a ring shape around the axis,

the elastomeric portion having a sealing lip, the sealing lip having a sealing lip,

The reinforcing ring has: an outer peripheral portion which is annular around the axis; an inner peripheral portion which is located on the inner peripheral side of the outer peripheral portion and is annular about the axis; and a spring portion extending between the outer peripheral portion and the inner peripheral portion and having a ring shape around the axis,

the sealing lip is mounted to the inner peripheral portion,

the spring portion is elastically deformable in a radial direction.

2. The rotary seal of claim 1, wherein,

the cross section of the spring part along the axis is wavy.

3. The rotary seal of claim 2, wherein,

the spring portion has at least one bending portion which is a portion bent in such a manner as to protrude in the direction of the axis,

the bend extends annularly about the axis.

4. The rotary seal of claim 3, wherein,

the spring portion has at least one side bent portion, which is a bent portion protruding to one side in the direction of the axis, and at least one other side bent portion, which is a bent portion protruding to the other side in the direction of the axis,

The one-side bent portions and the other-side bent portions are alternately arranged in the radial direction.

5. The rotary seal of claim 1, wherein,

the outer peripheral portion extends along the axis.

6. The rotary seal of claim 5, wherein,

an end portion of the outer peripheral portion on one side in the direction of the axis is connected to the spring portion,

the outer peripheral portion has a portion with a reduced diameter toward the other end in the direction of the axis.

7. The rotary seal of claim 6, wherein,

the elastomeric portion has a gasket portion in contact with the bore,

the sealing lip and the gasket portion are separate from each other,

the gasket portion covers the outer peripheral portion from the outer peripheral side at least at a portion on the one end portion side.

8. The rotary seal of claim 6, wherein,

the elastomer part is provided with a cover part,

the cover portion covers the other end portion of the outer peripheral portion.

9. The rotary seal of claim 1, wherein,

the inner peripheral portion extends along the axis.

10. The rotary seal of claim 9, wherein,

an end portion of the inner peripheral portion on the other side in the direction of the axis is connected to the spring portion,

The thickness of the inner peripheral portion becomes thinner toward one end in the direction of the axis.

11. The rotary seal of claim 10, wherein,

the lip tip end portion of the seal lip portion is located near the one end portion of the inner peripheral portion.

12. The rotary seal of claim 11, wherein,

the lip tip end portion of the seal lip portion faces away from the one end portion of the inner peripheral portion in the radial direction.

13. The rotary seal of claim 1, wherein,

the sealing lip has a dust lip.

14. The rotary seal of claim 1, wherein,

the direction along the axis in the sealing lip toward the lip tip end side is opposite to the direction along the axis in the outer peripheral portion toward the end portion on the side not connected to the spring portion.

15. The rotary seal of claim 1, wherein,

the thickness of the spring portion is set so that the pressing force of the seal lip portion against the shaft becomes a predetermined value.

16. A seal structure for effecting a seal between a shaft and a bore into which the shaft is inserted, the seal structure comprising:

a rotary seal is provided with: a reinforcing ring which is a ring-shaped member around the axis; and an elastic body portion mounted to the reinforcing ring and formed of an elastic body having a ring shape around the axis;

A support member that supports the rotary seal from one side in the direction of the axis in the hole; and

a pressing member that presses the rotary seal from the other side in the direction of the axis in the hole,

the elastomeric portion having a sealing lip, the sealing lip having a sealing lip,

the reinforcing ring has: an outer peripheral portion which is annular around the axis; an inner peripheral portion which is located on the inner peripheral side of the outer peripheral portion and is annular about the axis; and a spring portion extending between the outer peripheral portion and the inner peripheral portion and having a ring shape around the axis,

the sealing lip is mounted to the inner peripheral portion,

the spring portion is elastically deformable in a radial direction,

the outer peripheral portion extends along the axis and is connected to the spring portion at the one end portion,

the pressing member presses the end portion of the other side of the outer peripheral portion along the axis.

17. The seal structure of claim 16, wherein,

the pressing member is a member having a ring shape around the axis and has a surface capable of directly or indirectly contacting the other end of the outer peripheral portion.

18. The seal structure of claim 16, wherein,

the support member is a member that is annular about the axis, and has a surface that maintains a position of the outer peripheral portion in the hole in a direction of the axis.

19. The seal structure of claim 18, wherein,

the surface of the support member is in direct or indirect contact with the one end portion of the outer peripheral portion.

20. The seal structure of claim 18, wherein,

the surface of the support member is in direct or indirect contact with a portion where the outer peripheral portion and the spring portion are connected.

21. The seal structure of any one of claims 16 to 20, wherein,

the cross section of the spring part along the axis is wavy.

22. The seal structure of claim 21, wherein,

the spring portion has at least one bending portion which is a portion bent in such a manner as to protrude in the direction of the axis,

the bend extends annularly about the axis.

23. The seal structure of claim 22, wherein,

the spring part has at least one side bent part, and has at least one other side bent part, the one side bent part is a bent part protruding toward the one side, the other side bent part is a bent part protruding toward the other side,

The one-side bent portions and the other-side bent portions are alternately arranged in the radial direction.

24. The seal structure of claim 16, wherein,

the outer peripheral portion has a portion with a reduced diameter toward the other end portion.

25. The seal structure of claim 16, wherein,

the elastomeric portion has a gasket portion in contact with the bore,

the sealing lip and the gasket portion are separate from each other,

the gasket portion covers the outer peripheral portion from the outer peripheral side at least at a portion on the one end portion side.

26. The seal structure of claim 16, wherein,

the elastomer part is provided with a cover part,

the cover portion covers the other end portion of the outer peripheral portion.

27. The seal structure of claim 16, wherein,

the inner peripheral portion extends along the axis, and the other end portion is connected to the spring portion,

the thickness of the inner peripheral portion becomes thinner toward the one-side end portion.

28. The seal structure of claim 16, wherein,

the direction along the axis in the sealing lip toward the lip tip end side is opposite to the direction along the axis in the outer peripheral portion toward the end portion on the side not connected to the spring portion.

29. The seal structure of claim 16, wherein,

the thickness of the spring portion is set so that the pressing force of the seal lip portion against the shaft becomes a predetermined value.