JP2021110408A - Sealing device - Google Patents

Abstract

To provide a sealing device which can surely prevent the intrusion of dust such as muddy water, and is excellent in the removal performance of a seal member from a housing.SOLUTION: A sealing device 1 comprises a seal member 8 having a metal ring 9 and a seal main body 10, and a rotating slinger 11. The seal member 8 further has a seal lip 12 which slides with a slide face 11a of the rotating slinger 11, dust lips 15a, 15b in which the slide face 11a and dust lip tips 13a, 13b slide with respect to each other, and which suppress the intrusion of dust 14, and a seal flange part 6 partially and tightly adhering to a housing end face 2b of the housing 2. Here, the seal flange part 6 comprises an end face tight contact part 18, an oblique bent part 19, a flange part tip part 21 and a flange part dust lip 22, and a clearance 20 is formed between the housing end face 2b and the flange part tip part 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device. More specifically, the present invention relates to a sealing device that is mainly used for construction equipment, agricultural equipment, etc., and can prevent muddy water, etc. from entering the inside of the equipment.

Conventionally, a sealing device (oil) for preventing leakage of lubricating oil on a rotating shaft in mechanical parts such as engines in transportation equipment such as automobiles, or mechanical parts in various other industrial technology fields such as construction equipment and agricultural equipment. Seal) is used.

In particular, in the case of construction equipment used at construction sites and agricultural equipment such as tractors and cultivators used on agricultural land, in addition to dust and water, foreign substances such as mud, soil and sand (hereinafter referred to as "dust"). It is expected to be used in a harsh environment where there are many). Therefore, in these devices, there is a particular demand for a sealing device in which measures are taken to prevent the intrusion of dust including muddy water and to maintain stable sealing for a long period of time.

Explaining an example of the sealing device used for agricultural equipment and the like, for example, as shown in FIG. 5, the sealing device 100 is installed between the housing 101 and the rotating shaft 102 and fixed to the housing 101. A seal member 105 having a seal body 104 formed by adhering a rubber-like elastic body on the surface of the metal ring 103 and at least a part of the metal ring 103, and an outer peripheral surface of the rotating shaft 102 facing the seal member 105. It is mainly configured with a rotating slinger 106 fitted to 102a.

The seal body 104 slides on the rotating slinger 106 fitted to the rotating shaft 102, and seals the sealing fluid 107 (for example, lubricating oil or the like) to be sealed, and the seal lip 108 and foreign matter invading from the atmosphere 109 side. It is provided with a plurality of dust strips 111a and 111b and side lips 112 and the like for preventing dust 110 such as dust from entering the sealing fluid 107 side. As a result, it is possible to prevent the sealing fluid 107 from leaking and to prevent the dust 110 containing muddy water and the like from entering the sealing fluid 107 from the atmosphere 109 side.

Further, the sealing device 100 is provided in the outer peripheral direction (corresponding to the left direction of the paper surface in FIG. 5) from one end of the contact portion 105a of the sealing member 105 (seal body 104) in close contact with the inner peripheral surface 101a of the housing 101 on the atmospheric side 109 side. ), The seal flange portion 113 is provided so as to be in close contact with the housing end surface 101b of the housing 101. The seal flange portion 113 is composed of the metal ring 103 and a part of the seal body 104 described above. When the housing end surface 101b and the seal flange portion 113 are in close contact with each other without a gap, it is possible to more reliably prevent the intrusion of dust 110 such as muddy water.

On the other hand, sealing devices and sealing members used for axles of agricultural machinery such as tractors have already been proposed (see Patent Document 2). According to this, it is a sealing device for an axle of agricultural machinery provided with a sealing member having an annular main lip and an annular side lip in contact with the annular plate portion, and the side lip has a conical ring shape in which the diameter is expanded from the annular plate portion side. It is composed of a conical cylinder portion and a lip portion in contact with the annular plate portion, and includes an annular portion having an annular shape extending radially outward in a state of being elastically curved from the conical tubular portion. The lip portion includes at least the outer peripheral edge of the surface of the annulus portion facing the annular plate portion, and the portion of the surface of the annulus portion facing the annular plate portion that is radially inner of the annulus portion is an annular plate. Those having a gap between the portions are disclosed (see claim 1 and the like in Patent Document 1).

The axle sealing device for agricultural machinery having the above configuration makes it difficult for muddy water or the like to enter between the side lip and the sleeve even when the tightening allowance of the side lip is large, so that the wear of the side lip is not promoted. Further, it is disclosed that the contact surface pressure on the sleeve can be maintained for a long period of time, and the sealing property is maintained even in an environment exposed to muddy water or the like.

JP-A-2017-219176

However, the conventional sealing device may cause the following problems. That is, as shown in FIG. 5, a seal flange portion extending in a direction orthogonal to one end of the contact portion of the seal member with respect to the housing end surface of the housing in order to prevent dust such as muddy water from entering. The whole was formed in close contact.

Therefore, when removing the seal member from the housing, it is necessary to insert a tool such as a flat-blade screwdriver with a sharp tip between the end face of the housing and the seal flange to pry open the close contact between the housing and the seal flange. It became. Therefore, an excessive amount of labor is required to remove the seal member, and a large amount of time may be required for these operations.

Further, since it can be forcibly opened with a tool such as a flat-blade screwdriver, there is a possibility that the end face of the housing may be damaged by the flat-blade screwdriver or the like when removing the seal member. As a result, even if a new seal member is attached, a slight gap is generated between the end face of the housing and the seal flange portion, and there is a risk that muddy water or the like may enter through the gap.

Therefore, in view of the above circumstances, the present invention provides stable sealing performance while reliably preventing the intrusion of dust including foreign substances such as muddy water even in a harsh usage environment such as agricultural equipment, and removes the seal member. It is an object of the present invention to provide a sealing device having excellent workability in which the sealing member can be easily removed from the housing in the replacement work.

According to the present invention, a sealing device that solves the above problems is provided below.

[1] A seal body is provided which is installed between a housing and a rotating shaft and is attached to the housing and is formed by adhering a rubber-like elastic body on the surface of at least a part of the metal ring and the metal ring. A sealing device including a sealing member and a rotating slinger fitted to the outer peripheral surface of the rotating shaft, wherein the sealing member is a sliding surface of the rotating slinger facing the inner peripheral surface of the housing of the housing. A seal lip that slides to seal the sealing fluid to be sealed, and dust that is provided at a position on the atmosphere side of the seal lip and the sliding surface and the tip of the dust strip slide to enter from the atmosphere side. The dust strip for suppressing the intrusion into the sealing fluid side and the contact portion in contact with the inner peripheral surface of the housing are bent and extended from one end on the atmospheric side toward the outer peripheral direction of the rotating shaft. A sealing device further comprising a sealing flange portion that is in close contact with at least a part of the housing end surface of the housing that is orthogonal to the inner peripheral surface of the housing.

[2] The seal flange portion includes an end face close portion that is in close contact with the housing end face, and an obliquely bent portion that is obliquely bent and extended in a direction away from the housing end face from one end of the end face close portion. A flange portion tip that is bent and extended from one end of the diagonally bent portion so as to be parallel to the housing end face and forms a gap with the housing end face, and a flange portion tip that is close to the housing end face. The sealing device according to the above [1], which includes a flange portion dust strip extending in the direction of the housing and having a lip tip in close contact with the housing end face.

[3] The sealing device according to the above [2], wherein the flange portion dust strip is formed of a rubber-like elastic body and elastically deforms when the lip tip comes into close contact with the housing end face.

[4] The seal member is provided between the dust strip and the seal flange portion, and further has an orthogonal contact surface orthogonal to the sliding surface of the rotating slinger and a side lip on which the tip of the side lip slides. The sealing device according to any one of [1] to [3].

According to the sealing device of the present invention, a predetermined gap (space) is formed between the housing end face and the seal flange portion. In other words, a step is provided between the end face of the housing and the tip end of the flange portion of the seal flange portion.

As a result, the seal member can be easily removed from the housing without damaging the seal member and the end face of the housing, and the workability of the removal work and the replacement work of the seal member can be improved.

Further, even if muddy water or the like tries to enter the gap formed by the housing end face and the seal flange portion, the flange portion dust strip in which the lip tip is in close contact with the housing end face can prevent dust such as muddy water from entering the gap. can.

It is an enlarged sectional view of the main part which shows the schematic structure of the sealing device of this embodiment. It is an enlarged sectional view of the main part which shows the vicinity of the seal flange part of a sealing device. It is an enlarged sectional view of the main part which shows the vicinity of the seal flange part in the state which is attached to a housing. It is explanatory drawing which shows typically an example of the removal of a seal member by a removal jig. It is explanatory drawing which shows the schematic structure of an example of the sealing device used for the conventional agricultural machinery and the like.

Hereinafter, embodiments of the sealing device of the present invention will be described in detail with reference to the drawings. The sealing device according to the embodiment of the present invention is not limited to the ones shown below, and various design changes, modifications, improvements, etc. can be made without departing from the gist of the present invention. be.

As shown in FIGS. 1 to 4, the sealing device 1 according to the embodiment of the present invention is installed between the housing 2 and the rotating shaft 3, and is composed of the air 4 and the lubricating oil (corresponding to the sealing fluid in the present invention). It seals between the stored oil tank 5 and the oil tank 5.

Here, FIG. 1 is an enlarged cross-sectional view of a main part which is cut along the axial direction X of the rotating shaft 3 and is partially enlarged, showing a schematic configuration of the sealing device 1 of the present embodiment. FIG. 3 is an enlarged cross-sectional view of a main part showing the vicinity of the seal flange portion 6 of the sealing device 1, FIG. 3 is an enlarged cross-sectional view of the main part showing the vicinity of the seal flange portion 6 mounted on the housing 2, and FIG. It is explanatory drawing which shows typically an example of the removal of a seal member 8 by a jig 7. In addition, in FIG. 1, in order to specifically explain the sealing device 1 of the present embodiment, a part of the configuration of the housing 2 and the rotating shaft 3 is shown together with the configuration of the sealing device 1. There is. Further, FIGS. 3 and 4 also show a part of the configuration of the housing 2.

As shown mainly in FIG. 1, the sealing device 1 of the present embodiment is installed between the housing 2 and the rotating shaft 3, and has a rubber-like elastic body on the metal ring 9 and at least a part of the surface 9a of the metal ring 9. The seal member 8 is provided with the seal body 10 formed by adhering the above, and the rotary slinger 11 fitted to the outer peripheral surface 3a of the rotary shaft 3 is mainly provided.

The metal ring 9 formed as a part of the seal member 8 exhibits a substantially annular structure. The material constituting the metal ring 9 is not particularly limited, and for example, a well-known metal material such as stainless steel or SPCC (cold rolled steel) can be used, and such a metal material is pressed. By performing well-known metal processing such as processing and forging, it is possible to form a desired shape.

On the other hand, the seal body 10 formed by adhering to at least a part of the surface 9a of the metal ring 9 can use various materials as a rubber-like elastic body that can be elastically deformed with respect to stress. For example, nitrile. Well-known synthetic rubbers such as rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM) can be used.

The seal body 10 can be molded by, for example, cross-linking (vulcanization) molding using a molding die. At the time of this cross-linking molding, by arranging the metal ring 9 in the molding die, the seal body 10 is adhered to the metal ring 9 by cross-linking (vulcanization) adhesion, and the metal ring 9 and the seal body 10 are integrally formed. Can be molded. As a result, the sealing member 8 in the sealing device 1 of the present embodiment is formed.

On the other hand, as shown in FIG. 1, the rotary slinger 11 is fitted to the outer peripheral surface 3a of the rotary shaft 3, has a substantially annular shape, and has a seal lip 12 and dust strips 15a, 15b of the seal body 10. It has a substantially L-shaped cross section that slides on the side lip 23 (details will be described later). Since the configuration of the rotary slinger 11 in the sealing device 1 is well known, detailed description thereof will be omitted here. By providing the seal member 8 and the rotary slinger 11 so as to be provided, it is possible to stably seal between the atmosphere 4 side and the oil tank 5 side.

In the sealing device 1 of the present embodiment, the sealing main body 10 constituting the sealing member 8 projects toward the sliding surface 11a of the rotating slinger 11 arranged so as to face the inner peripheral surface 2a of the housing of the housing 2. The seal lip 12 for sealing the lubricating oil to be sealed stored in the oil tank 5 by sliding with the sliding surface 11a, and the position on the atmosphere 4 side of the seal lip 12 (below the paper surface in FIG. 1). (Corresponding to the direction), the sliding surface 11a and the respective dust strip tips 13a and 13b slide, and the dust 14 (see FIG. 3) that tries to enter from the atmosphere 4 side is on the oil tank 5 side (sealing fluid side). It also has a pair of dust strips 15a and 15b that prevent intrusion into the dust strips 15a and 15b.

In the sealing device 1 of the present embodiment, the configurations of the sealing lip 12 and the dust strips 15a and 15b are integrally formed as a partial configuration of the sealing main body 10. That is, it can be formed by press working at the same time as cross-linking (vulcanization) molding of the seal body 10. Therefore, the seal lip 12 and the dust strips 15a and 15b are each formed of the same rubber-like elastic body, and can be elastically deformed with respect to stress.

In the sealing device of the present invention, the seal lip, dust strip, etc. are not limited to the above. It may be connected using a well-known joining technique such as vulcanization) bonding. In this case, the seal lip and dust strip may be formed by using rubber-like elastic bodies of the same type and material, or different rubber-like elastic bodies of different types and materials may be used. do not have.

As shown in FIG. 1, the seal lip 12 in the sealing device 1 of the present embodiment has the rotating shaft 3 and the rotating shaft 3 so that the flat portion of the sealing lip tip 12a slides toward the sliding surface 11a of the rotating slinger 11. A part of the slinger 11 protrudes toward the rotary slinger 11 so as to have a substantially trapezoidal cross section. Then, by sliding the flat portion of the seal lip tip 12a with the sliding surface 11a, it is possible to seal between the atmosphere 4 side and the oil tank 5 side. As a result, the lubricating oil (sealing fluid) stored in the oil tank 5 does not leak to the atmosphere 4.

Further, the seal member 8 includes a metal coil spring 16 provided at a position close to the seal lip 12. By providing such a configuration, the seal lip tip 12a facing the sliding surface 11a of the rotating slinger 11 can be pressed toward the sliding surface 11a.

As a result, the tense force applied to the seal lip tip 12a of the seal lip 12 can be stably maintained, and the sliding between the seal lip 12 and the rotary slinger 11 is possible. As a result, the space between the atmosphere 4 and the oil tank 5 can be reliably sealed, and the problem that the lubricating oil stored in the oil tank 5 leaks to the atmosphere 4 side can be avoided, and the rotating shaft 3 is stabilized at a predetermined rotation speed. It becomes possible to rotate it.

Further, the sealing device 1 of the present embodiment is provided at a position on the atmosphere 4 side of the configuration of the seal lip 12, and has one end of the dust strip tips 13a and 13b that slide with the sliding surface 11a of the rotating slinger 11. It includes a pair of dust strips 15a and 15b formed by holding them on the side. As a result, even if the dust 14 (see FIG. 3) containing muddy water or the like tries to enter the oil tank 5, the dust strips 15a and 15b provided in front of the seal lip 12 reliably regulate the arrival of the dust 14 (see FIG. 3). be able to. In particular, since the pair of dust strips 15a and 15b are formed side by side, it is possible to more reliably prevent the dust 14 containing muddy water and the like from entering the oil tank 5 side.

The dust strips 15a and 15b are formed so as to project in an oblique direction (corresponding to the lower right direction of the paper surface in FIG. 1) toward the atmosphere 4 side and the rotation axis 3 side. As a result, the dust 14 that is about to move from the atmosphere 4 side to the oil tank 5 side along the axial direction X of the rotating shaft 3 (corresponding to the movement from the lower side of the paper surface to the upper side of the paper surface in FIG. 1) is slid by the rotating slinger 11. Since the moving surface 11a and the dust strip tips 13a and 13b slide, respectively, the movement of the dust 14 is restricted by the dust strips 15a and 15b.

In particular, since a pair of dust strips 15a and 15b are provided side by side, even if the dust strip 15b near the atmosphere 4 side (corresponding to the lower side of the paper surface in FIG. 1) is passed, the dust strip 15a near the oil tank 5 side is provided. This can prevent the intrusion of dust 14. Therefore, the dust 14 that has entered from the atmosphere 4 side rarely reaches the vicinity of the seal lip 12.

In addition, the sealing member 8 of the sealing device 1 of the present embodiment is in the outer peripheral direction of the rotating shaft 3 from one end of the contact portion 17 in contact with the inner peripheral surface 2a of the housing 2 on the atmosphere 4 side (FIGS. 1 to 1). It further has a seal flange portion 6 that is bent and extended toward the left side of the paper surface in No. 4) and is at least partially in close contact with the housing end surface 2b orthogonal to the housing inner peripheral surface 2a.

More specifically, the seal flange portion 6 is bent obliquely in a direction away from the end face close portion 18 which is in close contact with the housing end face 2b and one end of the end face close portion 18 from the housing end face 2b. A flange portion tip 21 that is bent and extended along the housing end surface 2b from one end of the extended diagonally bent portion 19 and a gap 20 can be formed between the diagonally bent portion 19 and the housing end surface 2b. The flange portion dust strip 22 is provided so as to extend from the flange portion tip portion 21 in an oblique direction close to the housing end surface 2b and the lip tip 22a is in close contact with the housing end surface 2b.

Here, the seal flange portion 6 is configured as a part of the seal member 8 described above, and is mainly formed in a state where the metal ring 9 and the seal body 10 are laminated on each other. The metal ring 9 side mainly faces the housing 2 and the housing end face 2b, while the seal body 10 side formed of the rubber-like elastic body mainly faces the atmosphere 4.

Therefore, in the end face close portion 18, a part of the metal ring 9 is in direct contact with the housing end face 2b. On the other hand, the diagonally bent portion 19 extending from the end face close portion 18 and the flange portion tip portion 21 extending from the diagonally bent portion 19 are separated from each other because the housing end face 2b and the metal ring 9 do not come into direct contact with each other. It is formed to do. As a result, as shown in FIGS. 3 and 4, a gap 20 having a desired shape is formed between the housing end surface 2b and the obliquely bent portion 19 and the flange portion tip portion 21. That is, a desired step is formed between the housing end surface 2b and the metal ring 9 of the flange portion tip portion 21.

Further, the seal flange portion 6 has a configuration that extends over the flange portion dust strip 22 extending from the flange portion tip portion 21 as another configuration. As a part of the seal main body 10 constituting the seal member 8, the flange portion dust strip 22 is pressed by a rubber-like elastic body in the same manner as the seal lip 12 and the like, similarly to the seal lip 12 and the dust strips 15a and 15b described above. It is integrally formed by processing. Therefore, the flange portion dust strip 22 itself is also formed so as to be elastically deformable with respect to stress.

The flange portion dust strip 22 has a connection point with the flange portion tip portion 21 as a base point, and the lip tip 22a of the flange portion dust strip 22 can be elastically deformed along the deformation direction A (see the arrow in FIG. 2). .. As a result, when the seal member 8 is attached to the housing 2, the lip tip 22a is slightly pressed toward the outer peripheral direction side of the rotating shaft 3 and is in a deformed state (see FIG. 3).

In this case, the elastically deformed flange portion dust strip 22 is subjected to a restoring force that tries to return from the elastically deformed state (see FIG. 3) to the original state (see FIG. 2) that is not subjected to the elastic deformation. That is, a force is applied by the lip tip 22a to press the housing end face 2b. As a result, the lip tip 22a of the flange portion dust strip 22 is in close contact with the housing end surface 2b.

As a result, the housing end face 2b and the lip tip 22a of the flange portion dust strip 22 are in close contact with each other without a gap, and the dust 14 is in close contact with the housing end face 2b and the lip tip 22a and the lip tip 22a (see the arrow in FIG. 3). Invasion from is regulated. That is, dust 14 containing muddy water or the like can easily enter the gap 20 which is a space surrounded by the housing end surface 2b, the flange portion dust strip 22, the diagonally bent portion 19 of the seal flange portion 6, and the flange portion tip portion 21. become unable. As a result, the sealing property in the sealing device 1 can be maintained.

Further, when the sealing device 1 of the present embodiment removes the sealing member 8 from the housing 2, for example, as shown in FIG. 4, a substantially L-shaped removing jig 7 having a bent tip is used. The insertion portion 7a of the removal jig 7 is inserted into the close close position B of the housing end surface 2b and the seal member 8, and the insertion portion 7a is brought into the gap 20 to hook the seal member 8 and facilitate the removal work. Can be done.

That is, a part of the end surface of the seal flange portion 6 is compared with the conventional sealing device 100 (see FIG. 5) described above in which the entire seal flange portion 113 is in close contact with the housing end surface 101b of the housing 101. Since the close contact portion 18 and the close contact position B between the close contact portion 18 and the lip tip 22a of the flange portion dust strip 22 separated from the end face close contact portion 18 are in close contact with the housing end face 2b, the insertion portion 7a of the removal jig 7 is inserted without difficulty. It becomes possible. Since the flange portion dust strip 22 is formed of a rubber-like elastic body as described above, it can be easily elastically deformed with respect to stress, and the operation of inserting the removal jig 7 is compared with the conventional case. It can be easily done with a relatively small force.

As a result, the workability required for removing the seal member 8 can be significantly shortened. Further, since the seal member 8 can be removed without applying an excessive force, it is possible to minimize the deformation of the seal member 8 and the damage to the housing end surface 2b due to prying open as in the conventional case. As a result, there is less risk of deterioration of the sealing property due to scratches on the end face 2b of the housing, and stable sealing property can be maintained for a long period of time.

Further, as another configuration, the sealing device 1 of the present embodiment is provided between the dust strips 15a and 15b and the seal flange portion 6 as shown in FIG. 1, and is provided on the sliding surface 11a of the rotating slinger 11. It has a side lip 23 on which an orthogonal orthogonal contact surface 11b and a side lip tip 23a slide. Here, the side lip 23 has substantially the same configuration as the dust strips 15a and 15b already described, and can be integrally formed by a rubber-like elastic body like the dust strips 15a and 15b. Further, since the side lip itself has a well-known configuration, detailed description thereof will be omitted here.

By providing the side lip 23, it is possible to regulate the movement of the dust 14 at a position closer to the atmosphere 4 before the dust 14 invading from the atmosphere 4 side reaches the pair of dust strips 15a and 15b. In other words, the orthogonal contact surface 11b orthogonal to the sliding surface 11a of the rotating slinger 11 and the side lip tip 23a slidably come into contact with each other, so that the atmosphere along the direction orthogonal to the axial direction X of the rotating shaft 3 The movement of the dust 14 from the 4 side, in other words, the movement of the dust 14 from the outer peripheral direction of the rotating shaft 3 to the axis direction (corresponding to the paper surface left direction to the paper surface right direction in FIG. 1) can be regulated. This further prevents the dust 14 from reaching the seal lip 12. That is, it is possible to more reliably prevent dust such as muddy water from entering the oil tank 5 side.

As shown above, the sealing device 1 of the present embodiment has a characteristic configuration relating to the seal flange portion 6 which is at least partially in close contact with the housing end face 2b and can form a gap 20 between the housing end face 2b. By providing the above, the workability for removing the seal member 8 can be improved. As a result, as compared with the conventional sealing member 105 (see FIG. 5), it is possible to obtain excellent effects such as more efficient removal work and suppression of scratches on the end face 2b of the housing.

On the other hand, even if a gap 20 is formed between the housing end surface 2b and the housing end surface 2b, dust 14 such as muddy water can enter the gap 20 by providing a configuration that covers the flange portion dust strip 22 provided in the seal flange portion 6. Can be prevented. Thereby, it is possible to regulate the movement of the dust 14 to the oil tank 5 side from between the housing end surface 2b and the seal member 8.

Further, according to the sealing device 1 of the present embodiment, the sealing member 8 is provided with a pair of dust strips 15a and 15b and, if necessary, a side lip 23, so that the sealing lip is similar to the conventional sealing device 100. The movement of the dust 14 can be reliably regulated before reaching 12. That is, it is possible to stably maintain the high sealing property (sealing property), which is the original function of the sealing device 1, and to improve the workability of the removal work and the like.

The sealing device of the present invention is a mechanical part in various industrial technical fields, particularly a mechanical part capable of exhibiting high sealing performance even in a harsh usage environment where a large amount of dust such as muddy water such as construction equipment and agricultural equipment is present. Can be used as a sealing device.

1,100: Sealing device 2,101: Housing 2a, 101a: Housing inner peripheral surface 2b, 101b: Housing end surface 3,102: Rotating shaft 3a, 102a: Outer peripheral surface 4,109: Atmosphere 5: Oil tank (sealing fluid)
6,113: Seal flange 7: Detachment jig 7a: Insertion 8,105: Seal member 9,103: Metal ring 9a: Surface 10,104: Seal body 11,106: Rotating slinger 11a: Sliding surface 11b : Orthogonal contact surface 12,108: Seal lip 12a: Seal lip tip 13a: Dustrip tip 13b: Dustrip tip 14,110: Dust 15a, 15b, 111a, 111b: Dustrip 15b: Dustrip 16: Coil spring 17, 105a : Contact portion 18: End face close portion 19: Diagonal bending portion 20: Gap 21: Flange portion tip portion 22: Flange portion dust strip 22a: Lip tip 23, 112: Side lip 23a: Side lip tip 107: Sealing fluid A: Deformation direction B: Close position X: Axial direction

Claims (4)

Installed between the housing and the rotating shaft,
A seal member attached to the housing and provided with a metal ring and a seal body formed by adhering a rubber-like elastic body to the surface of at least a part of the metal ring.
A sealing device including a rotating slinger fitted to the outer peripheral surface of the rotating shaft.
The seal member is
A seal lip that slides on the sliding surface of the rotating slinger facing the inner peripheral surface of the housing of the housing and seals the sealing fluid to be sealed.
A dust strip provided at a position on the atmosphere side of the seal lip, the sliding surface and the tip of the dust strip slide to prevent dust that has entered from the atmosphere side from entering the sealing fluid side.
At least the housing end surface of the housing, which is bent and extended from one end of the contact portion in contact with the inner peripheral surface of the housing on the atmospheric side toward the outer peripheral direction of the rotation shaft and is orthogonal to the inner peripheral surface of the housing. A sealing device further having a seal flange portion that is partially in close contact. The seal flange portion is
An end face close portion that is in close contact with the housing end face,
An obliquely bent portion that is obliquely bent and extended in a direction away from the end face of the housing from one end of the end face close portion, and a diagonally bent portion.
A flange portion tip portion that is bent and extended from one end of the diagonally bent portion so as to be parallel to the housing end face and forms a gap between the housing end face and the flange portion.
The sealing device according to claim 1, further comprising a flange portion dust strip extending from the flange portion tip portion toward the housing end face and having a lip tip in close contact with the housing end face. The flange dust strip
Formed of a rubber-like elastic body,
The sealing device according to claim 2, wherein the lip tip is elastically deformed when it comes into close contact with the housing end face. The seal member is
Provided between the dust strip and the seal flange portion
The sealing device according to any one of claims 1 to 3, further comprising an orthogonal contact surface orthogonal to the sliding surface of the rotating slinger and a side lip on which the tip of the side lip slides.

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