Outer casing, oil seal construction and industrial machinery

Abstract

An outer cover that can be openably sealed off the space around a grease drain port for discharging lubricant from a sealed lubricated part of an industrial machine body, the outer cover including a through hole that exposes the grease drain port when mounted on the industrial machine body; a first alignment surface disposed around the entire circumference of the through hole and facing a first contact surface disposed around the entire circumference of the grease drain port; and a second alignment surface disposed opposite to a second contact surface located around the entire outer circumference of the first contact surface; the first alignment surface can seal the entire circumference of the through hole by means of a first oil seal member compressed between the first contact surface and the first contact surface.

Description

Technical Field

[0001] The present invention relates to a housing, an oil seal structure, and an industrial machine. Prior Art

[0002] Conventionally, a lubricant discharge structure is known in which a lubricant such as grease is injected into a lubricated part to be sealed such as a speed reducer, and the used old lubricant is discharged from a grease discharge port (for example, refer to Patent Document 1). Such a lubricant discharge structure includes a pipe connected to the grease discharge port, a plug that openably closes the front end of the pipe, and a housing that stores the pipe in a state of being connected to the grease discharge port without exchanging the lubricant. By providing a hole in the housing, the plug at the front end of the pipe is exposed outside the housing, so that the plug can be removed and the lubricant can be discharged from the open front end of the pipe without removing the housing. [Prior Art Documents] [Patent Documents]

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2005-177914 Summary of the Invention

[0004] (Problems to be Solved by the Invention) However, in such a structure, a pipe, a connection member for connecting the pipe to the grease discharge port, a joint for detachably mounting the plug at the front end of the pipe, and an operation of installing the pipe are required. Therefore, it is desired to reduce the number of components, the amount of processing work, and the amount of assembly work, to perform replacement work easily at low cost without contaminating the inside with the discharged lubricant during replacement.

[0005] (Means for Solving the Problems) One embodiment of the present invention is a housing that openably closes a space around a grease discharge port for discharging a lubricant from a lubricated part sealed in an industrial machine body. The housing includes a through hole that exposes the grease discharge port when installed on the industrial machine body; a first alignment surface that is provided around the entire circumference of the through hole and faces a first contact surface provided around the entire circumference of the grease discharge port; and a second alignment surface that is disposed opposite to a second contact surface provided at a position on the entire outer circumference surrounding the first contact surface. The first alignment surface can seal the entire circumference around the through hole by a first oil seal member compressed between the first alignment surface and the first contact surface.

[0006] Further, another embodiment of the present invention is an oil seal structure. The space around the grease drain port for discharging the lubricant from the lubricated part to be sealed by the industrial machine body is enclosed in an openable manner by an outer cover. The oil seal structure includes a first contact surface disposed on the industrial machine body and arranged to surround the entire circumference of the grease drain port; a second contact surface disposed at a position surrounding the entire outer circumference of the first contact surface; a through hole provided in the outer cover to expose the grease drain port when installed on the industrial machine body; a first alignment surface arranged to face the entire circumference of the first contact surface; a second alignment surface arranged to face the entire circumference of the second contact surface; and a first oil seal member that can seal the entire circumference around the through hole by being compressed between the first alignment surface and the first contact surface.

[0007] Further, another embodiment of the present invention is an industrial machine, including an industrial machine body; an outer cover installed on the industrial machine body; and a first oil seal member sandwiched between the outer cover and the industrial machine body. The industrial machine body includes a first contact surface arranged to surround the entire circumference of the grease drain port for discharging the lubricant from the lubricated part to be sealed; and a second contact surface disposed at a position surrounding the entire outer circumference of the first contact surface. The outer cover includes a through hole to expose the grease drain port when installed on the industrial machine body; a first alignment surface arranged to face the entire circumference of the first contact surface; and a second alignment surface arranged to face the entire circumference of the second contact surface. The first oil seal member can seal the entire circumference around the through hole by being compressed between the first alignment surface and the first contact surface. Brief Description of the Drawings

[0008] [FIG. 1] is a partial longitudinal sectional view of an outer cover, an oil seal structure, and an industrial machine according to an embodiment of the present disclosure. [FIG. 2] is a partial side view of the outer cover and the industrial machine of FIG. 1. [FIG. 3] is a partial side view of the industrial machine body after installing the outer cover of FIG. 1. [FIG. 4] is a rear view of the outer cover of FIG. 2. [FIG. 5] is a partial exploded longitudinal sectional view of the outer cover, the oil seal structure, and the industrial machine of FIG. 1. [FIG. 6] is a partial longitudinal sectional view illustrating the grease discharging operation of the industrial machine of FIG. 1. Embodiments

[0009] An outer cover 12, an oil seal structure 30, and an industrial machine according to an embodiment of the present disclosure will be described below with reference to the drawings. In this embodiment, the industrial machine is described by taking the robot 1 as an example.

[0010] The robot 1 can be of any form. Here, a robot such as a vertical six-axis articulated robot, including at least one rotating joint that rotates and drives around a horizontal axis, will be taken as an example for explanation. In addition to the robot 1, industrial machinery can also be assumed to be, for example, a machine tool or an injection molding machine, etc., including a sealed lubricated part 4 such as a reducer 3, and any industrial machinery including a grease drain port 5a for discharging the used lubricant from the lubricated part 4.

[0011] As shown in FIG. 1, the robot 1 is installed on a base (not shown) fixed to a setting surface such as the ground, and includes a rotating body 2 (industrial machinery main body) that can rotate around a vertical axis. Further, the robot 1 includes a first robotic arm (not shown) that can rotate around a horizontal axis A relative to the rotating body 2.

[0012] Between the rotating body 2 and the first robotic arm, a reducer 3 is provided to reduce the rotation of a motor not shown in the figure and drive the first robotic arm to rotate around the horizontal axis A relative to the rotating body 2. The inside of the reducer 3 includes a reduction mechanism (not shown) and is filled with a lubricant such as grease to lubricate the reduction mechanism. Thus, the reducer 3, its outer shell, the rotating body 2, and the first robotic arm form a sealed lubricated part 4.

[0013] A grease drain hole 5 is provided on the rotating body 2 to communicate the inside of the reducer 3 with the outside of the robot 1. The grease drain port 5a at the front end of the grease drain hole 5 opens on the side surface perpendicular to the rotating body 2 and is normally sealed by a detachable plug 6. As shown in FIGS. 1 and 2, the grease drain hole 5 is provided on the inner side in the radial direction of the outer shape of the reducer 3 at a position higher than the horizontal axis A. This position is consistent with the appropriate lubricant filling height of the reducer 3.

[0014] In this embodiment, in the area including the horizontal axis A, the rotating body 2 and the reducer 3 are provided with a central opening 2a, 3a that penetrates along the horizontal axis A. As shown in FIG. 1, for example, a wire body 7 rising from the base side penetrates through the central openings 2a, 3a.

[0015] Although only one wire body 7 is shown in FIG. 1, a plurality of them can be provided, such as cables for driving the motor on the front end side of the first robotic arm, pipelines for water supply or gas supply, etc. The wire body 7 is wired to be fixed to the rotating body 2 by a sheet metal (not shown) fixed to the rotating body 2, and for example, a fixing member such as a nylon belt (not shown) fixes the middle position in its length direction to the rotating body 2 and then passes through the central openings 2a, 3a.

[0016] The rotating body 2 includes contact surfaces 8 and 9 (a first contact surface and a second contact surface) for mounting the later-described outer cover 12. As shown in FIG. 3, the first contact surface 8 is provided at a position surrounding the entire circumference of the oil drain port 5a and is a machined plane extending in the vertical direction. The second contact surface 9 is also a machined plane extending in the vertical direction, formed in an annular shape, and its inner edge forms an opening 10 that opens the internal space M of the rotating body 2 to the outside.

[0017] In the opening 10 in the state where the outer cover 12 is removed, there are arranged a space connected to the base side, mounting bolts 11 for mounting the speed reducer 3 to the rotating body 2, and a central opening 2a. That is to say, in the state after removing the outer cover 12 from the rotating body 2, via the opening 10 that opens to the inside of the second contact surface 9, operations such as mounting the speed reducer 3 to the rotating body 2 and wiring the wire body 7 can be carried out.

[0018] In the present embodiment, the first contact surface 8 and the second contact surface 9 are provided on the same plane and are continuously connected to each other as shown in FIG. 3. On the second contact surface 9, a plurality of screw holes 13 for mounting the outer cover 12 are provided at intervals in the circumferential direction.

[0019] The robot 1 further includes the outer cover 12 of the present embodiment mounted on the rotating body 2, and a first oil seal member 14 and a second oil seal member 15 that seal between the outer cover 12 and the rotating body 2. As shown in FIG. 4, when the outer cover 12 is mounted on the rotating body 2, the outer cover 12 includes a through hole 16 that exposes the oil drain port 5a, a first alignment surface 17 disposed opposite to the entire circumference of the first contact surface 8, and a second alignment surface 18 disposed opposite to the entire circumference of the second contact surface 9. Specifically, the first alignment surface 17 and the second alignment surface 18 may also be the unprocessed surfaces of the outer cover 12 manufactured by die casting, or the processed surfaces formed by processing the outer cover 12.

[0020] As shown in FIG. 1, the through hole 16 has a shape that gradually expands from the side of the first alignment surface 17 of the outer cover 12 to the outside surface side. In the present embodiment, although the first alignment surface 17 and the second alignment surface 18 are separated, they are provided on the same plane.

[0021] Further, an annular first oil seal groove 19 that surrounds the entire circumference around the through hole 16 is provided on the first alignment surface 17. When the second alignment surface 18 is disposed opposite to the second contact surface 9, it includes a plurality of bolt holes 21 provided at positions corresponding to the screw holes 13 of the second contact surface 9. Further, the second alignment surface 18 includes an annular second oil seal groove 20 formed along the inner edge on the edge side that is more inside the second alignment surface 18 than all the bolt holes 21.

[0022] The first oil seal member 14 is a rubber O-ring accommodated in the first oil seal groove 19. The second oil seal member 15 is an annular seal member composed of the same cross-section and material as the O-ring accommodated in the second oil seal groove 20 and preformed to fit the shape of the second oil seal groove 20.

[0023] As described above, the oil seal structure 30 of the present embodiment includes the first contact surface 8 and the second contact surface 9 provided on the rotating body 2, the through hole 16, the first alignment surface 17, and the second alignment surface 18 provided on the outer cover 12, and the first oil seal member 14 and the second oil seal member 15.

[0024] The functions of the outer cover 12, the oil seal structure 30, and the industrial machine of the present embodiment will be described below. According to the present embodiment, by removing the outer cover 12 from the rotating body 2, the internal space M of the rotating body 2 is opened due to the opening 10, so that the installation and removal operations of the speed reducer 3 and the wiring operation of the wire body 7 can be performed through the opening 10. Further, by installing the outer cover 12 of the present embodiment on the rotating body 2, the opening 10 is closed to define the internal space M in a sealed state, and the internal structures such as the space connected to the base and the wire body 7 disposed inside the opening 10 can be hidden.

[0025] When the outer cover 12 is installed on the rotating body 2, as shown in FIG. 5, the first oil seal member 14 is housed in the first oil seal groove 19 provided in the outer cover 12, and the second oil seal member 15 is housed in the second oil seal groove 20. The first oil seal member 14 and the second oil seal member 15 are held in the housed state in the first oil seal groove 19 and the second oil seal groove 20 by their elasticity or the adhesiveness of additional lubricating grease or the like.

[0026] In this state, the first alignment surface 17 and the second alignment surface 18 of the outer cover 12 face the first contact surface 8 and the second contact surface 9 of the rotating body 2 respectively, and the bolt 22 passing through the bolt hole 21 of the outer cover 12 is tightened to the corresponding screw hole 13. Thus, the first alignment surface 17 gradually approaches the first contact surface 8, and the second alignment surface 18 gradually approaches the second contact surface 9. Finally, the first oil seal member 14 is compressed between the first oil seal groove 19 and the first contact surface 8, and the second oil seal member 15 is compressed between the second oil seal groove 20 and the second contact surface 9 respectively.

[0027] That is to say, according to this embodiment, as shown in FIGS. 1 and 2, when the outer cover 12 is mounted on the rotating body 2, the drain port 5a provided on the rotating body 2 is disposed inside the through hole 16 of the outer cover 12 and is exposed to the outside. Also, the gap between the rotating body 2 and the outer cover 12 is sealed entirely by the first oil seal member 14 and the second oil seal member 15.

[0028] When performing the drain operation of the lubricated part 4 such as the speed reducer 3, as shown in FIG. 6, while maintaining the state where the outer cover 12 is mounted on the rotating body 2, the bolt 6 is removed from the drain port 5a through the through hole 16, and a new lubricant is injected through a grease supply port (not shown). Thus, the used old lubricant filled in the lubricated part 4 is pushed out from the drain port 5a and discharged to the outside of the robot 1 through the through hole 16 of the outer cover 12. That is to say, the lubricant in the lubricated part 4 is replaced with a new lubricant and filled to the specified filling degree.

[0029] In this case, according to this embodiment, the gap between the rotating body 2 and the outer cover 12 around the drain port 5a is sealed entirely by the first oil seal member 14. Therefore, the lubricant pushed out from the drain port 5a does not enter the internal space M of the rotating body 2 through the gap between the rotating body 2 and the outer cover 12, but is all discharged to the outside through the through hole 16 as shown by the arrow.

[0030] That is to say, according to the outer cover 12, the oil seal structure and the industrial machine of this embodiment, the first oil seal member 14 provided between the first contact surface 8 of the rotating body 2 and the first alignment surface 17 of the outer cover 12 directly seals around the drain port 5a. Thus, the conventionally required pipes, the connection components for connecting the pipes to the drain port 5a, the connectors for detachably mounting the bolt 6 at the front end of the pipes, and the installation work of the pipes are no longer required.

[0031] Therefore, it has the advantage that the number of components, the amount of processing work, and the amount of assembly work can be reduced, thereby reducing costs. Moreover, even without using pipes or the like, it is possible to prevent the lubricant discharged during replacement from contaminating the interior of the rotating body 2 such as the wire body 7, and the lubricant replacement work can be easily performed.

[0032] Since the first oil seal member 14 for sealing the grease discharge port 5a and the second oil seal member 15 for the entire sealing opening 10 are provided separately, in applications where high sealing performance is not required in the internal space M of the rotating body 2, the second oil seal member 15 can be omitted. For example, a robot used in an environment with less moisture or dust does not require the second oil seal member 15, and the cost increase due to overprotection can be avoided.

[0033] Moreover, according to the present embodiment, since the first contact surface 8 and the second contact surface 9 of the rotating body 2 are arranged in the same plane, it is easy to process. Also, since the first alignment surface 17 and the second alignment surface 18 of the outer cover 12 are also arranged in the same plane, it is easy to process. Moreover, since the through hole 16 of the outer cover 12 has a shape that expands outward, the operation of removing the bolt 6 from the outside is easy, and it is easy for the lubricant discharged from the grease discharge port 5a to flow out and easy to wipe off.

[0034] The first contact surface 8 and the second contact surface 9 of the rotating body 2, and the first alignment surface 17 and the second alignment surface 18 of the outer cover 12 may not be arranged in the same plane. As long as, when the outer cover 12 is installed on the rotating body 2, the arrangement positions are such that the first alignment surface 17 and the first contact surface 8, and the second alignment surface 18 and the second contact surface 9 are in close contact, they do not need to be arranged in the same plane.

[0035] Moreover, in the present embodiment, although the outer cover 12 including both the first oil seal groove 19 and the second oil seal groove 20 is adopted, it may only include the first oil seal groove 19. As described above, in applications where it is not necessary to seal the internal space M of the rotating body 2, the second oil seal groove 20 for installing the second oil seal member 15 may not be provided.

[0036] Further, in the present embodiment, although an O-ring or an equivalent oil seal member is used as the first oil seal member 14 and the second oil seal member 15, instead, a flat gasket may be used. When an O-ring is used as the first oil seal member 14 and a gasket is used as the second oil seal member 15, as described above, the second oil seal groove 20 of the outer cover 12 may not be required. Further, when gaskets are used as both the first oil seal member 14 and the second oil seal member 15, neither the first oil seal groove 19 nor the second oil seal groove 20 may be required.

[0037] Further, although an example has been given of providing the first oil seal groove 19 on the first alignment surface 17 of the outer cover 12 and the second oil seal groove 20 on the second alignment surface 18, instead, the first oil seal groove 19 may be provided on the first contact surface 8 of the rotating body 2 and the second oil seal groove 20 may be provided on the second contact surface 9.

[0038] Although the drain port 5a in the speed reducer 3 between the rotating body 2 and the first robotic arm has been taken as an example, it can also be applied to lubricated parts such as speed reducers and gearboxes of other joints. Further, although an industrial machine has been exemplified as a vertical six-axis multi-joint robot, it can also be applied to other types of robots, machine tools, injection molding machines, and other industrial machines.

[0039] The embodiments of the present disclosure have been described in detail, but the present disclosure is not limited to the above-described embodiments. These embodiments can be subjected to various additions, replacements, changes, partial deletions, etc. within the scope of not departing from the gist of the present invention or within the scope of not departing from the content described in the claims and the ideas and spirits derived from their equivalents. For example, in the above-described embodiments, the order of each operation and the order of each process are one of the exemplary examples and are not limited thereto.

[0040] Regarding the above-described embodiments and variations, the following additional remarks are disclosed. [Additional Remark 1] An outer cover that encloses the space around a drain port for discharging a lubricant from a lubricated part sealed by an industrial machine body in an openable manner, the outer cover comprising: A through hole that exposes the drain port when installed on the industrial machine body; A first alignment surface provided around the entire circumference of the through hole, facing a first contact surface provided around the entire circumference of the drain port; and A second alignment surface disposed opposite to a second contact surface provided at a position on the entire outer circumference surrounding the first contact surface; The first alignment surface can seal the entire circumference around the through hole by means of a first oil seal member compressed between the first contact surface.

[0041] [Supplementary Note 2] The outer cover as described in Supplementary Note 1, wherein on the first alignment surface, there is provided a first oil seal groove that surrounds the entire circumference around the through hole and can accommodate the first oil seal member.

[0042] [Supplementary Note 3] The outer cover as described in Supplementary Note 2, wherein on the second alignment surface, there is provided a second oil seal groove that extends to the entire circumference and accommodates a second oil seal member compressed between the second contact surfaces.

[0043] [Supplementary Note 4] The outer cover as described in any one of Supplementary Notes 1 to 3, wherein on the second contact surface, a plurality of screw holes are provided at intervals in the circumferential direction; On the second alignment surface, a plurality of bolt holes are provided at positions corresponding to the screw holes for a bolt to pass through.

[0044] [Supplementary Note 5] The outer cover as described in any one of Supplementary Notes 1 to 3, wherein the first oil seal member is an O-ring.

[0045] [Supplementary Note 6] The outer cover as described in any one of Supplementary Notes 1 to 3, wherein the first alignment surface and the second alignment surface are arranged on the same plane.

[0046] [Supplementary Note 7] An oil seal structure, which can openably seal the space around a drain port for discharging lubricant from a lubricated part to be sealed from an industrial machine body by means of an outer cover. The oil seal structure includes: A first contact surface, which is arranged on the industrial machine body and is set to surround the entire circumference around the drain port; A second contact surface, which is arranged at a position surrounding the entire outer circumference of the first contact surface; A through hole, which is provided in the outer cover and exposes the drain port when the outer cover is installed on the industrial machine body; A first alignment surface, which is arranged to face the entire circumference of the first contact surface; A second alignment surface, which is arranged to face the entire circumference of the second contact surface; and A first oil seal member can seal the entire circumference around the through hole by being compressed between the first alignment surface and the first contact surface.

[0047] [Supplementary Note 8] The oil seal structure according to Supplementary Note 7, wherein a first oil seal groove that surrounds the entire circumference around the drain port and can accommodate the first oil seal member is provided on the first alignment surface or the first contact surface.

[0048] [Supplementary Note 9] The oil seal structure according to Supplementary Note 8, wherein a second oil seal groove that extends to the entire circumference and accommodates a second oil seal member compressed between the second contact surfaces is provided on the second alignment surface or the second contact surface.

[0049] [Supplementary Note 10] The oil seal structure according to any one of Supplementary Notes 7 to 9, wherein a plurality of screw holes are provided on the second contact surface at intervals in the circumferential direction; On the second alignment surface, a plurality of bolt holes are provided at positions corresponding to the screw holes for a bolt to pass through.

[0050] [Supplementary Note 11] The oil seal structure according to any one of Supplementary Notes 7 to 9, wherein the first oil seal member is an O-ring.

[0051] [Supplementary Note 12] The oil seal structure according to any one of Supplementary Notes 7 to 9, wherein the first alignment surface and the second alignment surface are arranged on the same plane.

[0052] [Supplementary Note 13] An industrial machine, comprising: An industrial machine body; A housing, mounted on the industrial machine body; and A first oil seal member, sandwiched between the housing and the industrial machine body; The industrial machine body includes: A first contact surface, provided to surround the entire circumference around a drain port for discharging lubricant of a lubricated part to be sealed; and A second contact surface, provided at a position surrounding the entire outer circumference of the first contact surface; The housing includes: A through hole that exposes the drain port when mounted on the industrial machine body; a first alignment surface configured to face the first contact surface in a circumferential manner; and a second alignment surface configured to face the second contact surface in a circumferential manner; By being compressed between the first alignment surface and the first contact surface, the first oil seal member can seal the entire circumference around the through hole.

[0053] 1: Robot 2: Rotating body 2a: Central opening 3: Reducer 3a: Central opening 4: Lubricated part 5: Oil drain hole 5a: Oil drain port 6: Bolt 7: Cable body 8: First contact surface 9: Second contact surface 10: Opening 11: Mounting bolt 12: Housing 13: Threaded hole 14: First oil seal member 15: Second oil seal member 16: Through hole 17: First alignment surface 18: Second alignment surface 19: First oil seal groove 20: Second oil seal groove 21: Bolt hole 22: Bolt 30: Oil seal structure A: Horizontal axis M: Internal space

Claims

1. An outer casing that can be openably closed around a grease drain port for discharging lubricant from a sealed lubricated part of an industrial machine body, the outer casing comprising: A through hole, which exposes the grease drain port when mounted on the industrial machinery body; a first alignment surface, which is disposed around the entire circumference of the through hole and faces a first contact surface disposed around the entire circumference of the grease drain port. And a second alignment surface, disposed opposite to a second contact surface located at a position surrounding the entire outer circumference of the first contact surface; the first alignment surface can seal the entire circumference around the through hole by means of a first oil seal component compressed between it and the first contact surface.

2. The outer cover as described in claim 1, wherein, On the first alignment surface, there is a first oil seal groove that surrounds the entire circumference of the through hole and can accommodate the first oil seal component.

3. The outer cover as described in claim 2, wherein, On the second alignment surface, there is a second oil seal groove, which extends to the full circumference and is accommodated between the second contact surface and a second oil seal component that is compressed.

4. The outer cover as described in any one of claims 1 to 3, wherein, On the second contact surface, a plurality of screw holes are provided at circumferential intervals; on the second alignment surface, a plurality of bolt holes are provided at positions corresponding to the screw holes, through which a bolt passes.

5. The outer cover as described in any one of claims 1 to 3, wherein, The first oil seal component is an O-ring.

6. The outer cover as described in any one of claims 1 to 3, wherein, The first alignment surface and the second alignment surface are disposed on the same plane.

7. An oil seal configuration that can be openably sealed by an outer cover around a grease drain port for discharging lubricant from a sealed lubricated part of an industrial machine body, the oil seal configuration comprising: A first contact surface, fitted to the industrial machinery body, is configured to surround the entire circumference of the grease drain port; a second contact surface, fitted to the industrial machinery body, is positioned to surround the entire circumference of the outer side of the first contact surface; a through hole is provided in the outer cover, exposing the grease drain port when mounted on the industrial machinery body; a first alignment surface is provided in the outer cover, configured to face the first contact surface around its entire circumference; a second alignment surface is provided in the outer cover, configured to face the second contact surface around its entire circumference; and a first oil seal component, which, by being compressed between the first alignment surface and the first contact surface, can seal the entire circumference of the through hole.

8. The oil seal construction as described in claim 7, wherein, On the first alignment surface or the first contact surface, there is a first oil seal groove that surrounds the entire circumference of the grease outlet and can accommodate the first oil seal component.

9. The oil seal construction as described in claim 8, wherein, On the second alignment surface or the second contact surface, there is a second oil seal groove, which extends to the full circumference and is accommodated between the second contact surface and a second oil seal component that is compressed.

10. The oil seal construction as described in any one of claims 7 to 9, wherein, On the second contact surface, a plurality of screw holes are provided at circumferential intervals; on the second alignment surface, a plurality of bolt holes are provided at positions corresponding to the screw holes, through which a bolt passes.

11. The oil seal construction as described in any one of claims 7 to 9, wherein, The first oil seal component is an O-ring.

12. The oil seal construction as described in any one of claims 7 to 9, wherein, The first alignment surface and the second alignment surface are disposed on the same plane.

13. An industrial machine, comprising: One type of industrial machinery body; An outer cover is installed on the main body of the industrial machinery; The device includes a first oil seal component sandwiched between the outer casing and the industrial machinery body; the industrial machinery body includes: a first contact surface configured to surround a grease drain port for discharging lubricant from a sealed lubricated part; and a second contact surface configured to surround the outer circumference of the first contact surface; the outer casing includes: a through hole exposing the grease drain port when mounted on the industrial machinery body; a first alignment surface configured to face the first contact surface around its entire circumference; and a second alignment surface configured to face the second contact surface around its entire circumference; the first oil seal component can seal the entire circumference of the through hole by being compressed between the first alignment surface and the first contact surface.

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