TW201943986A - Sealing mechanism and device with the same characterized by suppressing an external force from acting on the oil slinger, so as to prevent the oil slinger from deviating from a predetermined position - Google Patents

Abstract

The present patent application relates to a sealing mechanism of sealing the space between a shaft member and a casing receiving at least one portion of the shaft member. In one embodiment, the sealing mechanism includes: an oil slinger disposed on the outer peripheral surface of the shaft member; a sealing member disposed between the casing and the oil slinger; and a cover member used to prevent the oil slinger from being exposed to the outer space. The cover member is configured to cover at least one portion of an end surface of the oil slinger and is integrally formed with the shaft member.

Description

Sealing mechanism and device having the same

The present invention relates to a sealing mechanism for preventing a fluid located in a device from flowing out of the device and a fluid from the outside flowing into the device, and a device having the sealing mechanism.

There is known a sealing mechanism that seals between a rotating member and a housing that houses the rotating member.

The previous sealing mechanism is disclosed in Japanese Patent Laid-Open No. 2009-150417 (Patent Document 1). The publication discloses a sealing mechanism having a sealing member and an oil-throwing cup surrounded by the sealing member. The oil sling cup is provided so as to surround the joint member on the outer side of the joint device. The oil sling cup plays a role of preventing the sealing member from deforming when the sealing member is assembled to the joint device.
[Prior technical literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-150417

[Problems to be solved by the invention]

Regarding the sealing member disclosed in Patent Document 1, the oil-throwing cup is exposed to the outer space. Therefore, external force may be applied to the oil sling cup by using washing water or the like, which may cause the oil sling cup to deviate from a designated installation position. In addition, there is a problem in that the oil throw-off cup falls off from the installation position due to vibration or the like.

An object of the present invention is to provide a sealing mechanism capable of suppressing an external force from acting on an oil sling cup, and a device having the sealing mechanism.
[Technical means to solve the problem]

One embodiment of the present invention relates to a sealing mechanism for sealing between a shaft member and a housing that houses at least a part of the shaft member. The sealing mechanism includes: an oil sling cup provided on the outer peripheral surface of the shaft member; a sealing member provided between the housing and the oil sling cup; and a cover member that prevents at least a part of the oil sling cup Exposed.

An embodiment of the present invention is a device including: a shaft member; a housing that accommodates at least a portion of the shaft member; and a sealing mechanism that seals the shaft member and the housing. In this device, the sealing mechanism is provided with an oil sling cup provided on an outer peripheral surface of the shaft member, a sealing member provided between the housing and the oil sling cup, and a cover member which prevents the above At least a part of the oil cup is exposed.

In the sealing mechanism according to an embodiment of the present invention, the cover member is configured to cover at least a part of the end surface of the oil-throwing cup.

In the sealing mechanism according to an embodiment of the present invention, the cover member is formed integrally with the shaft member.

In a sealing mechanism according to an embodiment of the present invention, in a radial direction of the shaft member, an interval between an outer peripheral surface of the cover member and an inner peripheral surface of the housing is larger than a size of the sealing member in an extended posture.

In the sealing mechanism according to an embodiment of the present invention, the height of the cover member in the radial direction of the shaft member is the same as or lower than the height of the oil throw cup in the direction.

A sealing mechanism according to an embodiment of the present invention includes an elastic member provided between the oil sling cup and an outer peripheral surface of the shaft member, and the elastic member has a recessed portion.

In the sealing mechanism according to an embodiment of the present invention, the elastic member includes a cylindrical portion, and the recessed portion is disposed in the cylindrical portion.

In a sealing mechanism according to an embodiment of the present invention, the elastic member includes a cylindrical portion and a flange portion extending from the cylindrical portion to a radially inner side of the shaft member. The recessed portion is disposed at a corner portion between the cylindrical portion and the flange portion.

The sealing mechanism according to the above-mentioned embodiment of the present invention can be preferably used for various devices.
[Effect of the invention]

By suppressing the external force from acting on the oil-throwing cup, it is possible to prevent the oil-throwing cup from deviating or falling off from the set position.

FIG. 1 is a cross-sectional view of a device 10 including a sealing mechanism 1 according to an embodiment of the present invention.

The device 10 includes a shaft member 4, a housing 5, and a sealing mechanism 1. A sealing mechanism 1 according to an embodiment of the present invention seals between the shaft member 4 and the housing 5. Thereby, the sealing mechanism 1 seals the internal space of the device 10 from the external space.

The device 10 includes a sealing mechanism 1, a shaft member 4, and a case 5, but the constituent elements of the device 10 are not limited to these. That is, the device 10 may include components other than the sealing mechanism 1, the shaft member 4, and the housing 5.

The device 10 is, for example, a reduction gear. The device 10 may be a device other than a speed reducer. The shaft member 4 is, for example, a member rotated by a reduction gear. The shaft member may also be a rotatable rotating member. The sealing mechanism 1 is not intended to be provided only in a specific device, and can be applied to any device including a rotating member.

The shaft member 4 according to an embodiment of the present invention is configured to rotate around a specified rotation axis. The shaft member 4 has a cylindrical shape, a cylindrical shape, or another shape. FIG. 1 shows two arrows extending parallel to the rotation axis of the shaft member 4. One of the arrows (the arrow toward the right side of the paper surface) is oriented in a direction parallel to the rotation axis of the shaft member 4 and toward the internal space of the housing 5. The other one of the arrows (the arrow toward the left side of the paper surface) is oriented A direction parallel to the rotation axis of the shaft member 4 and facing the outer space of the housing 5.

A casing 5 according to an embodiment of the present invention is arranged coaxially or substantially coaxially with the shaft member 4. At least one of the shaft member 4 and the housing 5 according to an embodiment of the present invention rotates about a rotation axis. The shaft member 4 may be rotated relative to the fixed housing 5, and the housing 5 may be rotated relative to the fixed shaft member 4.

A housing 5 according to an embodiment of the present invention has an internal space, and a part of the shaft member 4 is accommodated in the internal space. Components other than the shaft member 4 of the device 10 can also be accommodated in the internal space of the casing 5. As an example, a gear unit that can be connected to the shaft member 4 may be housed in the internal space of the housing 5.

A sealing mechanism 1 according to an embodiment of the present invention is provided in a ring-shaped space between the shaft member 4 and the casing 5, thereby sealing the internal space of the casing 5 from the external space.

The shaft member 4 according to an embodiment of the present invention has an outer peripheral surface 14. The inner peripheral surface of the sealing mechanism 1 is in close contact with the outer peripheral surface 14 of the shaft member 4.

A casing 5 according to an embodiment of the present invention has an inner peripheral surface 15. The outer peripheral surface 23 of the sealing mechanism 1 is in close contact with the inner peripheral surface 15 of the casing 5. As described above, the sealing mechanism 1 is disposed between the inner peripheral surface 15 of the housing 5 and the outer peripheral surface 14 of the shaft member 4.

A sealing mechanism 1 according to an embodiment of the present invention includes an oil sling cup 2 and a sealing member 3. The oil sling cup 2 includes a cylindrical portion 11 and a flange portion 12 that protrude from an end portion of the cylindrical portion 11 toward a radially inner side of the shaft member 4. The oil shaker 2 may include components other than the cylindrical portion 11 and the flange portion 12. In one embodiment, the oil sling cup 2 is provided in close contact with the outer peripheral surface 14 of the shaft member 4. As shown in the figure, the oil flick cup 2 may be provided on the outer peripheral surface 14 of the shaft member 4 through the elastic member 17. The elastic member 17 is an elastically deformable member such as rubber. As a material of the elastic member 17, a well-known material which can be elastically deformed can be used suitably.

The cylindrical portion 11 of the oil sling cup 2 is formed in a cylindrical shape in part or in whole. One or both ends of the cylindrical portion 11 may be chamfered.

The sealing mechanism 1 includes a cover member 16 configured and arranged so as to prevent the oil sling cup 2 from being exposed to an external space. The cover member 16 is configured and arranged to prevent at least a part of the oil sling cup 2 from being exposed.

In the device 10 according to an embodiment of the present invention, the cover member 16 prevents external force from acting on the oil sling cup 2, so that the oil sling cup 2 can be prevented from deviating or falling off from the installation position.

In the illustrated embodiment, the cover member 16 is provided integrally with the shaft member 4. Thereby, as compared with the case where a cover member is attached after the sealing mechanism 1 is assembled, the assembling operation of the sealing mechanism 1 to the device 10 can be made more efficient.

In one embodiment of the present invention, the cover member 16 is configured to cover at least a part of the end surface 2 a of the oil sling cup 2. Accordingly, it is possible to suppress an external force from acting on the end surface 2 a of the oil sling cup 2. The end surface 2 a is an end surface opposite to the internal space of the casing 5 in a direction along the rotation axis of the casing 5. By covering at least a part of the end surface 2 a of the oil sling cup 2 with the cover member 16, it is possible to effectively prevent an external force acting on the oil sling cup 2 from being pushed inwardly of the housing 5. This can effectively prevent the oil sling cup 2 from deviating from the installation position, and in particular, can prevent the oil sling cup 2 from moving closer to the inside of the housing 5 than the original installation position. If the oil sling cup 2 moves toward the inside of the casing 5, it will cause the device 10 to be damaged due to interference between other components of the device 10 and the oil sling cup 2. The cover member 16 prevents or inhibits the end surface 2 a of the oil-throwing cup 2 from moving toward the inside of the casing 5, so that the device 10 can be prevented from being damaged.

In one embodiment of the present invention, the height H1 of the cover member 16 in the radial direction of the shaft member 4 (hereinafter sometimes referred to as "radial direction") is the same as the height H2 of the oil cup 2 in the direction. Or lower than that. The oil sling cup 2 and the sealing member 3 are pressed between the outer peripheral surface 14 of the shaft member 4 and the inner peripheral surface 15 of the housing 5. If the height of the cover member 16 is high, and therefore the step difference between the cover member 16 and the outer peripheral surface 14 of the shaft member 4 becomes large, the deformation amount of the oil throwing cup 2 and the sealing member 3 becomes larger when the press is pushed in, and the oil throwing cup 2 and the sealing member 3 are easily damaged. By making the height H1 of the cover member 16 the same as the height H2 of the oil cup 2 in the direction, or lower than the height H2 of the oil cup 2 in the direction, the sealing member 3 and the oil cup can be prevented 2 is broken when pressed. In one embodiment of the present invention, the height H1 of the cover member 16 in the radial direction of the shaft member 4 is the same as the height H3 of the elastic member 17 in the direction, or becomes the height of the elastic member 17 in the direction. H3 or more. Thereby, it is possible to suppress an external force from acting on the oil sling cup 2. Thereby, it is possible to prevent deviation or fall-off of the oil flick cup 2 from the installation position.

In FIG. 1, the sealing member 3 is pressed between the outer peripheral surface 14 of the shaft member 4 and the inner peripheral surface 15 of the housing 5, and thus is contracted in the radial direction of the shaft member 4. The seal member 3 assumes an extended position due to its own elasticity when no external compressive force is applied. Therefore, regarding the size of the seal member in the radial direction of the shaft member 4, the size when taking the extended posture is larger than the size when taking the curved posture shown in FIG. In one embodiment of the present invention, the height H1 of the cover member 16 in the radial direction is determined in such a manner that the outer peripheral surface 16a of the cover member 16 in the radial direction and the inner peripheral surface 15 of the housing 5 The interval is larger than the dimension of the seal member 3 in the extended position in the radial direction of the shaft member 4. Thereby, the outer peripheral surface 16 a of the cover member 16 is located closer to the radially inner side of the shaft member 4 than the end face or end portion of the seal member 3 in the radial direction in the extended posture. This prevents interference between the sealing member 3 and the cover member 16 when the sealing member 3 is assembled to the device 10. Therefore, the assembling operation of the sealing member 3 to the device 10 can be made efficient, and breakage of the sealing member 3 can be prevented.

Next, a sealing mechanism 1 according to another embodiment of the present invention will be described with reference to FIG. 2. In the sealing mechanism 1 shown in FIG. 2, the elastic member 17 is different from the sealing mechanism 1 shown in FIG. 1 in that it has a recess 13. Since the oil sling cup 2 has an interference amount, when the oil sling cup 2 is pressed into the shaft member 4, friction resistance from the outer surface 14 of the shaft member 4 acts on the oil sling cup 2. If the resistance becomes large, there is a problem that the oil throwing cup 2 cannot be inserted into a predetermined installation position. In addition, if the oil throwing cup 2 is forced into it, it may cause the deformation and breakage of the oil throwing cup 2.

To cope with this problem, in the sealing mechanism 1 of FIG. 2, the elastic member 17 includes a recessed portion 13. The elastic member 17 may include only one recessed portion 13, or may include two recessed portions 13 as shown in FIG. 2. The recessed portion 13 may be provided on the surface of the elastic member 17 that faces the outer peripheral surface 14 of the shaft member 4.

With this recessed portion 13, even when the resistance of the self-shaft member 4 to the elastic member 17 increases when the oil flick cup 2 is pushed in, the elastic member 17 can be moved toward the space defined by the recessed portion 13 The movement reduces the resistance from the shaft member 4 to the oil sling cup 2. Therefore, it becomes easy to insert the oil flick cup 2 into a predetermined installation position.

In the illustrated embodiment, the elastic member 17 includes a cylindrical portion 18 that surrounds the rotation shaft of the shaft member 4. The concave portion 13 may be provided in the cylindrical portion 18.

In the illustrated embodiment, the elastic member 17 includes a flange portion 19 extending from an end portion of the cylindrical portion 18 to a radially inner side of the shaft member 4 and a corner portion 28 located between the cylindrical portion 18 and the convex portion. Between the edges 19. The concave portion 13 may be provided in the corner portion 28. Thereby, the elastic member 17 can be moved toward the space defined by the recessed portion 13 provided at the corner portion 28 when the oil sling cup 2 is pressed in, so that the oil sling cup 2 can be easily inserted into a predetermined installation position.

The number and size of the recessed portions 13 provided in the elastic member 17 can be appropriately set in consideration of the resistance acting on the oil shaker 2 and other conditions.

The cylindrical portion 11 of the oil slinger 2 includes an inner peripheral surface 21 and an outer peripheral surface 20 which is opposite to the inner peripheral surface 21. In the illustrated embodiment, an elastic member 17 is provided on the inner peripheral surface 21 of the cylindrical portion 11 and the outer peripheral surface 14 of the shaft member 4. An adhesive layer may be provided instead of the elastic member 17. With this bonding layer, the oil flick cup 2 is bonded to the outer peripheral surface 14 of the shaft member 4. A member other than the adhesive layer may be provided on the inner peripheral surface 21 of the cylindrical portion 11 and the outer peripheral surface 14 of the shaft member 4.

When the oil throwing cup 2 is pressed into the shaft member 4, a jig, not shown, which determines the installation position with respect to the shaft member 4 may also be used.

Referring to FIG. 1 again, the sealing member 3 will be further described. The sealing member 3 according to an embodiment of the present invention includes a main ring portion 24 having a ring shape around the rotation axis of the shaft member 4. The main ring portion 24 includes: a cylindrical portion 241 having a cylindrical shape; an inner end portion 243 which is disposed more inward than the cylindrical portion 241 in the radial direction of the shaft member 4; and a connecting portion 242 which connects the cylindrical portion 241 is connected to the inner end portion 243. The connection portion 242 has a substantially ring shape. The sealing member 3 is arranged such that the outer peripheral surface 23 (of the cylindrical portion 241) of the main ring portion 24 is in contact with the inner peripheral surface 15 of the housing 5. The inner end portion 243 includes a ring-shaped main lip 25 and a ring-shaped dust lip 26. A spring ring 27 is provided outside the main lip 25 in the radial direction of the shaft member 4.

The dust lip 26 is an inner end portion 243 of the main ring portion 24 protruding obliquely toward the outer space and the radially inner side of the shaft member 4. The dust lip 26 prevents foreign matter such as dust floating in the external space from entering the internal space.

The front end of the dust lip 26 is in contact with the outer peripheral surface 20 of the cylindrical portion 11. While at least one of the shaft member 4 and the housing 5 is rotating, the front end of the dust lip 26 rubs against the cylindrical portion 11. In one embodiment, the oil sling cup 2 is formed of a material having better wear resistance than the shaft member 4. Therefore, it is possible to suppress abrasion of the oil flick cup 2 caused by contact with the dust lip 26.

The main lip 25 is in contact with the outer peripheral surface 20 of the cylindrical portion 11. A spring ring 27 is provided on the outside of the main lip 25 in a radial direction of the shaft member 4 so as to surround the main lip 25. The spring ring 27 applies a force to the main lip 25 toward the radially inner side of the shaft member 4. Thereby, the main lip 25 is in close contact with the outer peripheral surface 20 of the cylindrical portion 11. Thereby, the liquid (for example, lubricating oil) accommodated in the internal space can be prevented from leaking to the external space between the main lip 25 and the outer peripheral surface 20 of the cylindrical portion 11.

During the rotation of at least one of the shaft member 4 and the housing 5, the main lip 25 rubs against the cylindrical portion 11 of the oil sling cup 2. As described above, in one embodiment, the oil sling cup 2 is formed of a material having better wear resistance than the shaft member 4. Therefore, it is possible to suppress abrasion of the oil flick cup 2 caused by contact with the main lip 25.

The sealing mechanism 1 may include other sealing members in addition to the sealing member 3. The other sealing member is provided adjacent to the sealing member 3. The other sealing member is provided so as to surround the rotation axis of the shaft member 4. This other sealing member may be arranged on the outside (outer space side) in the direction of the rotation axis of the shaft member 4.
[Industrial availability]

The principle of the above embodiment can be applied to various mechanical equipment.

1‧‧‧sealing mechanism

2‧‧‧ Shake Oil Cup

2a‧‧‧face

3‧‧‧sealing member

4‧‧‧ Shaft member

5‧‧‧shell

10‧‧‧ device

11‧‧‧ tube

12‧‧‧ flange

13‧‧‧ recess

14‧‧‧outer surface

15‧‧‧Inner peripheral surface

16‧‧‧ Cover member

16a‧‧‧outer surface

17‧‧‧ Elastic member

18‧‧‧ tube

19‧‧‧ flange

20‧‧‧ outer surface

21‧‧‧Inner peripheral surface

23‧‧‧outer surface

24‧‧‧Main Ring Department

25‧‧‧ main lip

26‧‧‧ dust lips

27‧‧‧Spring ring

28‧‧‧ Corner

241‧‧‧Cylinder

242‧‧‧ Connection Department

243‧‧‧ inside end

H1‧‧‧ height

H2‧‧‧ height

H3‧‧‧ Height

FIG. 1 is a schematic cross-sectional view of a sealing mechanism according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a sealing mechanism according to another embodiment of the present invention.

Claims (9)

A sealing mechanism is used for sealing between a shaft member and a housing accommodating at least a part of the shaft member, and comprises: An oil throwing cup, which is arranged on the outer peripheral surface of the shaft member; A sealing member provided between the housing and the oil cup; and A cover member that prevents at least a part of the oil flick cup from being exposed. The sealing mechanism according to claim 1, wherein the cover member is configured to cover at least a part of an end surface of the oil-throwing cup. The sealing mechanism according to claim 1 or 2, wherein the cover member is formed integrally with the shaft member. The sealing mechanism according to any one of claims 1 to 3, wherein in a radial direction of the shaft member, an interval between an outer peripheral surface of the cover member and an inner peripheral surface of the housing is larger than the seal member in an extended posture Of the size. The sealing mechanism according to any one of claims 1 to 4, wherein in the radial direction of the shaft member, the height of the cover member is the same as or lower than the height of the oil shaker. A device having: Shaft member A housing that houses at least a portion of the shaft member; and A sealing mechanism that seals between the shaft member and the housing; and The aforementioned sealing mechanisms include: An oil throwing cup, which is arranged on the outer peripheral surface of the shaft member; A sealing member provided between the housing and the oil cup; and A cover member that prevents at least a part of the oil flick cup from being exposed. A sealing mechanism which seals between a shaft member and a housing that houses at least a part of the shaft member, and The sealing mechanism has: An oil throwing cup, which is arranged on the outer peripheral surface of the shaft member; A sealing member provided between the housing and the oil cup; and The elastic member has a recessed portion and is provided between the oil sling cup and an outer peripheral surface of the shaft member. The sealing mechanism according to claim 7, wherein the elastic member includes a cylindrical portion, and the recessed portion is disposed in the cylindrical portion. The sealing mechanism according to claim 8, wherein the elastic member includes a flange portion extending from the cylindrical portion to a radially inner side of the shaft member, The recessed portion is disposed at a corner portion between the cylindrical portion and the flange portion.