Cap, sealing structure, and industrial machine

Abstract

A cover for closing a space around a grease discharge port for discharging a lubricant from a hermetically sealed portion to be lubricated of an industrial machine body in an openable manner, the cover being provided with: a through-hole for exposing the grease discharge port in a state in which the cover is attached to the industrial machine body; a first mating surface provided around the through-hole over the entire circumference thereof and facing a first support surface provided around the grease discharge port over the entire circumference thereof; and a second mating surface disposed so as to face the second support surface over the entire circumference, the second support surface being provided at a position surrounding the outside of the first support surface over the entire circumference, and the first mating surface being capable of sealing the circumference of the through-hole over the entire circumference by means of a first sealing member compressed between the first mating surface and the first support surface.

Description

Technical Field

[0001] This invention relates to covers, sealing structures, and industrial machinery. Background Technology

[0002] Previously, a lubricant discharge structure was known that injects lubricant such as grease into a sealed lubricated part such as a speed reducer, and discharges used old lubricant from the grease discharge port (for example, see Patent Document 1).

[0003] The lubricant discharge structure includes: a tube connected to a grease drain port; a plug that can be opened to close the front end of the tube; and a cap that directly accommodates the tube when it is not being replaced, with the tube connected to the grease drain port. By providing a hole in the cap and allowing the plug at the front end of the tube to protrude from the cap, the plug can be removed and the lubricant discharged from the open front end of the tube without removing the cap.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-177914 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] However, this structure requires a tube, a connecting component for connecting the tube to the grease drain port, a connector for attaching a plug to the front end of the tube in a removable manner, and the tube installation process. Therefore, it is desirable to minimize the number of components, machining time, and assembly time, and to perform replacement operations easily and at low cost without contaminating the inside with lubricant discharged during replacement.

[0009] Solution for solving the problem

[0010] One aspect of the invention is a cover characterized in that the cover can be opened to close the space around a grease drain port for discharging lubricant from a sealed lubricated part of an industrial machine body. The cover includes: a through hole that exposes the grease drain port when the cover is installed on the industrial machine body; a first mating surface disposed around the through hole over its entire circumference and facing a first support surface disposed around the grease drain port over its entire circumference; and a second mating surface disposed opposite the second support surface over its entire circumference, the second support surface being disposed at a position surrounding the outside of the first support surface over its entire circumference. The first mating surface can seal the space around the through hole over its entire circumference using a first sealing member compressed between the first mating surface and the first support surface.

[0011] Another aspect of the present invention is a sealing structure, characterized in that the sealing structure utilizes a cover to close the space around a grease drain port in an openable manner, the grease drain port being used to discharge lubricant from a sealed lubricated part of an industrial machinery body, the sealing structure comprising: a first support surface and a second support surface disposed on the industrial machinery body, the first support surface being disposed around the grease drain port in a circumferential manner, and the second support surface being disposed on the outer side of the first support surface in a circumferential manner; a through hole, a first mating surface, and a second mating surface disposed on the cover, the through hole exposing the grease drain port when the cover is installed on the industrial machinery body, the first mating surface being disposed opposite the first support surface in a circumferential manner, and the second mating surface being disposed opposite the second support surface in a circumferential manner; and a first sealing member, which is compressed between the first mating surface and the first support surface to seal the space around the through hole in a circumferential manner.

[0012] Another aspect of the present invention is an industrial machine, characterized in that the industrial machine comprises: an industrial machine body; a cover mounted on the industrial machine body; and a first sealing member sandwiched between the cover and the industrial machine body. The industrial machine body comprises: a first support surface disposed around a grease outlet for discharging lubricant from a sealed lubricated part throughout its entire circumference; and a second support surface disposed around the outer side of the first support surface throughout its entire circumference. The cover comprises: a through hole that exposes the grease outlet when the cover is mounted on the industrial machine body; a first mating surface disposed opposite to the first support surface throughout its entire circumference; and a second mating surface disposed opposite to the second support surface throughout its entire circumference. The first sealing member is compressed between the first mating surface and the first support surface, thereby sealing the area around the through hole throughout its entire circumference. Attached Figure Description

[0013] Figure 1 This is a partial longitudinal sectional view illustrating a cover, sealing structure, and industrial machinery according to one embodiment of the present invention.

[0014] Figure 2 yes Figure 1 A partial side view of the cover and industrial machinery.

[0015] Figure 3 It is being disassembled Figure 1 A partial side view of the main body of an industrial machine in its covered state.

[0016] Figure 4 yes Figure 2 Rear view of the cover.

[0017] Figure 5 Yes Figure 1 An exploded longitudinal sectional view illustrating the cover, sealing structure, and industrial machinery.

[0018] Figure 6 Yes Figure 1 A partial longitudinal sectional view illustrating the degreasing operation of industrial machinery. Detailed Implementation

[0019] Hereinafter, an embodiment of the cover 12, sealing structure 30, and industrial machinery of the present invention will be described with reference to the accompanying drawings.

[0020] In this embodiment, robot 1 is used as an example of industrial machinery for explanation.

[0021] As robot 1, any form of robot can be adopted. Here, a robot with at least one rotary joint driven to rotate around a horizontal axis, such as a vertical six-axis multi-joint robot, will be used for illustration.

[0022] As industrial machinery, in addition to robot 1, any industrial machinery such as machine tool or injection molding machine can be conceived. The industrial machinery has a closed lubricated part 4 such as reducer 3, and has a grease outlet 5a from which the used lubricant is discharged.

[0023] like Figure 1 As shown, robot 1 has a rotating body (industrial mechanical body) 2, which is supported so that it can rotate about a vertical axis relative to a base (not shown) fixed to a surface such as the ground. In addition, robot 1 has a first arm (not shown), which is supported so that it can rotate about a horizontal axis A relative to the rotating body 2.

[0024] A reducer 3 is provided between the rotating body 2 and the first arm. This reducer 3 reduces the rotation of a motor (not shown) and drives the first arm to rotate about a horizontal axis A relative to the rotating body 2. The reducer 3 has a reduction mechanism (not shown) inside and is filled with a lubricant such as grease for lubricating the reduction mechanism. Thus, the reducer 3 constitutes a lubricated part 4 sealed by its housing, the rotating body 2, and the first arm.

[0025] The rotating body 2 is provided with a grease drain hole 5 that connects the interior of the reducer 3 to the exterior of the robot 1. The grease drain port 5a at the front end of the grease drain hole 5 opens to the vertical side of the rotating body 2 and is normally closed by a removable plug 6. Figure 1 as well as Figure 2As shown, the drain hole 5 is provided, for example, inside the radial outer shape of the speed reducer 3 and at a position higher than the horizontal axis A. This position is consistent with the filling level of the lubricant recommended in the speed reducer 3.

[0026] In the present embodiment, the rotating body 2 and the speed reducer 3 have a central opening 2a, 3a penetrating along the horizontal axis A in the region including the horizontal axis A. As Figure 1 shown, the central openings 2a, 3a penetrate, for example, a linear body 7 standing up from the base side.

[0027] The linear body 7 is Figure 1 shown as only one in the figure, but may have multiple ones, such as cables for driving motors arranged on the front end side of the first arm, pipes for water supply or gas supply, etc. The linear body 7 is, for example, fixed by a fixing member such as a nylon band not shown in the figure, and is routed to a sheet metal part not shown fixed to the rotating body 2 in such a manner that it penetrates the central openings 2a, 3a after fixing a mid-position in its length direction to the rotating body 2.

[0028] The rotating body 2 has support surfaces (first support surface and second support surface) 8, 9 for mounting the following cover 12. As Figure 3 shown, the first support surface 8 is a machined plane provided at a position surrounding the drain port 5a in the entire circumference and extending in the vertical direction. The second support surface 9 is also a machined plane extending in the vertical direction and is formed in a ring shape, and an inner edge thereof forms an opening 10 through which the internal space M of the rotating body 2 opens to the outside.

[0029] In the opening 10 in the state where the cover 12 is removed, a space continuous with the base side, mounting bolts 11 for mounting the speed reducer 3 on the rotating body 2, and the central opening 2a are arranged. That is, in the state where the cover 12 is removed from the rotating body 2, via the opening 10 opening inside the second support surface 9, installation work of the speed reducer 3 on the rotating body 2, wiring work of the linear body 7, etc. can be performed.

[0030] In the present embodiment, the first support surface 8 and the second support surface 9 are provided on the same plane and are Figure 3 shown as being continuous with each other. A plurality of threaded holes 13 for mounting the cover 12 are provided at intervals in the circumferential direction on the second support surface 9.

[0031] The robot 1 further includes: the cover 12 of the present embodiment, which is mounted on the rotating body 2; and a first sealing member 14 and a second sealing member 15, which seal between the cover 12 and the rotating body 2.

[0032] As Figure 4As shown, the cover 12 includes: a through hole 16, which exposes the grease drain port 5a when the cover 12 is installed on the rotating body 2; a first mating surface 17, which is arranged to face the first support surface 8 throughout its circumference; and a second mating surface 18, which is arranged to face the second support surface 9 throughout its circumference. Specifically, the first mating surface 17 and the second mating surface 18 can be either die-cast to produce the cover 12, thus using a surface that does not require machining, or they can be machined surfaces formed by machining the cover 12.

[0033] like Figure 1 As shown, the through hole 16 has a shape that gradually expands from the first mating surface 17 side of the cover 12 toward the outer surface side. In this embodiment, the first mating surface 17 and the second mating surface 18 are separate, but are provided on the same plane.

[0034] Furthermore, the first mating surface 17 is provided with an annular first sealing groove 19 that surrounds the through hole 16 throughout its entire circumference. The second mating surface 18 has a plurality of bolt holes 21 located at positions corresponding to the threaded holes 13 of the second support surface 9 when configured opposite to the second support surface 9. In addition, the second mating surface 18 has an annular second sealing groove 20 formed along its inner edge at a position closer to its inner edge than all the bolt holes 21.

[0035] The first sealing component 14 is a rubber O-ring that is accommodated in the first sealing groove 19.

[0036] The second sealing member 15 is formed with the same cross-section and material as the O-ring accommodated in the second sealing groove 20, and is a ring-shaped sealing member pre-formed according to the shape of the second sealing groove 20.

[0037] As described above, the sealing structure 30 of this embodiment includes: a first support surface 8 and a second support surface 9, which are disposed on the rotating body 2; a through hole 16, a first mating surface 17 and a second mating surface 18, which are disposed on the cover 12; and a first sealing member 14 and a second sealing member 15.

[0038] The following describes the functions of the cover 12, the sealing structure 30, and the industrial machinery in this embodiment.

[0039] According to this embodiment, since the internal space M of the rotating body 2 is opened through the opening 10 by removing the cover 12 from the rotating body 2, the installation and removal of the reducer 3 and the wiring of the line body 7 can be performed through the opening 10.

[0040] Furthermore, by installing the cover 12 of this embodiment onto the rotating body 2, the opening 10 is closed and the internal space M is defined as a sealed state, which can hide the internal structure such as the space continuous with the base and the line body 7 disposed in the opening 10.

[0041] like Figure 5 As shown, when the cover 12 is installed on the rotating body 2, the first sealing member 14 is accommodated in the first sealing groove 19 provided in the cover 12, and the second sealing member 15 is accommodated in the second sealing groove 20. The first sealing member 14 and the second sealing member 15 are held in the first sealing groove 19 and the second sealing groove 20 respectively in an accommodated state by their elasticity or by the adhesiveness of the additionally used grease, etc.

[0042] In this state, the first mating surface 17 and the second mating surface 18 of the cover 12 are respectively aligned with the first support surface 8 and the second support surface 9 of the rotating body 2, and the bolts 22 passing through the bolt holes 21 of the cover 12 are tightened into the corresponding threaded holes 13. As a result, the first mating surface 17 approaches the first support surface 8, and the second mating surface 18 approaches the second support surface 9. Consequently, the first sealing member 14 is compressed between the first sealing groove 19 and the first support surface 8, and the second sealing member 15 is compressed between the second sealing groove 20 and the second support surface 9.

[0043] That is, according to this embodiment, such as Figure 1 as well as Figure 2 As shown, if the cover 12 is installed on the rotating body 2, the grease outlet 5a provided in the rotating body 2 is disposed inside the through hole 16 of the cover 12 and exposed to the outside. In addition, the gap between the rotating body 2 and the cover 12 is sealed by the first sealing member 14 and the second sealing member 15 throughout the entire circumference.

[0044] When performing grease removal operations from the lubricated parts 4 of the reducer 3, such as... Figure 6 As shown, with the cover 12 installed on the rotating body 2, the plug 6 is removed from the grease drain port 5a through the through hole 16, and new lubricant is filled into the grease supply port (not shown). Thus, the used old lubricant filled in the lubricated part 4 is pushed out from the grease drain port 5a and discharged to the outside of the robot 1 through the through hole 16 of the cover 12. That is, the lubricant in the lubricated part 4 is replaced with new lubricant and filled to a predetermined filling level.

[0045] In this case, according to this embodiment, the gap between the rotating body 2 and the cover 12 is sealed by the first sealing member 14 around the grease outlet 5a throughout its entire circumference. Therefore, the lubricant discharged from the grease outlet 5a does not pass through the gap between the rotating body 2 and the cover 12 and enter the internal space M of the rotating body 2, but is instead discharged to the outside through the through hole 16, as indicated by the arrow.

[0046] That is, according to the cover 12, sealing structure, and industrial machinery of this embodiment, the area around the grease drain port 5a is directly sealed by the first sealing member 14 disposed between the first support surface 8 of the rotating body 2 and the first mating surface 17 of the cover 12. As a result, the installation work of the tube, the connecting member for connecting the tube to the grease drain port 5a, the connector for detachably installing the plug 6 at the front end of the tube, and the tube itself, which are required in the past, is not needed.

[0047] Therefore, it has the following advantages: the number of parts, processing time, and assembly time can be kept low, and costs can be reduced. Moreover, even without the use of pipes, the inner side of the rotating body 2, such as the line body 7, will not be contaminated by the lubricant discharged during replacement, and the lubricant replacement operation can be carried out easily.

[0048] Since a first sealing member 14 is provided to seal the grease drain port 5a and a second sealing member 15 is provided to seal the entire opening 10, the second sealing member 15 can be omitted in applications where a high level of sealing of the internal space M of the rotating body 2 is not required. For example, in robots used in environments with less fog and dust, the second sealing member 15 is not needed, which can suppress the increase in cost caused by excessive protection.

[0049] Furthermore, according to this embodiment, since the first support surface 8 and the second support surface 9 of the rotating body 2 are arranged in the same plane, processing is easy. Additionally, since the first mating surface 17 and the second mating surface 18 of the cover 12 are also arranged in the same plane, processing is easy.

[0050] In addition, since the through hole 16 of the cover 12 has a shape that expands outward, it is easy to remove the plug 6 from the outside, and the lubricant discharged from the grease drain port 5a can easily flow out and be easily wiped away.

[0051] Furthermore, the first support surface 8 and the second support surface 9 of the rotating body 2, and the first mating surface 17 and the second mating surface 18 of the cover 12 can also be arranged in the same plane. If the cover 12 can be arranged in a position where the first support surface 8 is close to the first mating surface 17 and the second support surface 9 is close to the second mating surface 18 when it is installed on the rotating body 2, then it is not necessary to arrange them in the same plane.

[0052] In this embodiment, a cover 12 having both a first sealing groove 19 and a second sealing groove 20 is used; however, it may also have only the first sealing groove 19. As described above, in applications where sealing the internal space M of the rotating body 2 is not required, the second sealing groove 20 itself may not be required for the installation of the second sealing member 15.

[0053] In this embodiment, O-rings or equivalent sealing components are used as the first sealing member 14 and the second sealing member 15, but flat gaskets may also be used instead. When an O-ring is used as the first sealing member 14 and a gasket is used as the second sealing member 15, as described above, the second sealing groove 20 of the cover 12 may be omitted. Furthermore, when both the first sealing member 14 and the second sealing member 15 are gaskets, both the first sealing groove 19 and the second sealing groove 20 may be omitted.

[0054] In addition, an example is given of a first sealing groove 19 provided on the first mating surface 17 of the cover 12 and a second sealing groove 20 provided on the second mating surface 18. However, alternatively, a first sealing groove 19 may be provided on the first support surface 8 of the rotating body 2 and a second sealing groove 20 may be provided on the second support surface 9.

[0055] Taking the grease drain port 5a in the reducer 3 between the rotating body 2 and the first arm as an example, it can also be applied to other lubricated parts such as reducers and gearboxes in other joints. Furthermore, while a vertical six-axis articulated robot has been used as an example of industrial machinery, it can also be applied to other types of robots, machine tools, injection molding machines, and other industrial machinery.

[0056] The various embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described above. In these embodiments, various additions, conversions, modifications, partial deletions, etc., can be made without departing from the spirit of the invention, or without departing from the content of the claims and the idea and spirit of the present invention derived therefrom. For example, in the embodiments described above, the order of each action and the order of each process are shown as examples, and are not limited thereto.

[0057] The following notes further disclose the above-described embodiments and variations.

[0058] Postscript 1

[0059] A cover that can be opened to close the space around a grease drain port for discharging lubricant from a sealed, lubricated part of an industrial machine body.

[0060] The cover includes: a through hole that exposes the grease drain port when the cover is mounted on the main body of the industrial machinery; a first mating surface disposed around the through hole over its entire circumference and facing a first support surface disposed around the grease drain port over its entire circumference; and a second mating surface disposed opposite to a second support surface over its entire circumference, the second support surface being disposed at a position surrounding the outer side of the first support surface over its entire circumference.

[0061] The first mating surface can seal the area around the through hole throughout its circumference using a first sealing member that is compressed between the first mating surface and the first support surface.

[0062] Appendix 2

[0063] In the cover described in Appendix 1, a first sealing groove is provided on the first mating surface. The first sealing groove surrounds the periphery of the through hole throughout its entire circumference and is capable of accommodating the first sealing component.

[0064] Appendix 3

[0065] In the cover described in Appendix 2, a second sealing groove is provided on the second mating surface, the second sealing groove extending over the entire circumference and accommodating a compressed second sealing member between the second mating surface and the second support surface.

[0066] Appendix 4

[0067] In any of the caps described in Appendix 1 to 3,

[0068] The second support surface is provided with a plurality of threaded holes spaced apart circumferentially.

[0069] The second mating surface is provided with a plurality of bolt holes, which are located at positions corresponding to the threaded holes and allow the bolts to pass through.

[0070] Appendix 5

[0071] In any one of the appendices 1 to 4, the first sealing element is an O-ring.

[0072] Appendix 6

[0073] In any one of the appendices 1 to 5, the first mating surface and the second mating surface are disposed on the same plane.

[0074] Postscript 7

[0075] A sealing structure that utilizes a cover to close the space around a grease drain port in an openable manner, the grease drain port being used to discharge lubricant from a sealed, lubricated part of an industrial machine body.

[0076] The sealing structure includes:

[0077] The first support surface and the second support surface are disposed on the main body of the industrial machinery. The first support surface is disposed around the grease outlet in the entire circumference. The second support surface is disposed on the outer side of the first support surface in the entire circumference.

[0078] A through hole, a first mating surface, and a second mating surface are provided in the cover. The through hole exposes the grease drain port when the cover is installed on the main body of the industrial machinery. The first mating surface is disposed opposite to the first support surface throughout its entire circumference, and the second mating surface is disposed opposite to the second support surface throughout its entire circumference.

[0079] The first sealing member is compressed between the first mating surface and the first supporting surface, thereby sealing the area around the through hole throughout its circumference.

[0080] Postscript 8

[0081] In the sealing structure described in Appendix 7, a first sealing groove is provided on the first mating surface or the first supporting surface. The first sealing groove surrounds the grease outlet around its entire circumference and is capable of accommodating the first sealing component.

[0082] Postscript 9

[0083] In the sealing structure described in Appendix 8, a second sealing groove is provided on the second mating surface or the second supporting surface. The second sealing groove extends over the entire circumference and accommodates a compressed second sealing component between the second mating surface and the second supporting surface.

[0084] Postscript 10

[0085] In any of the sealing structures described in Appendix 7 to 9

[0086] The second support surface is provided with a plurality of threaded holes spaced apart circumferentially.

[0087] The second mating surface is provided with a plurality of bolt holes, which are located at positions corresponding to the threaded holes and allow the bolts to pass through.

[0088] Postscript 11

[0089] In any one of the sealing structures described in Appendix 7 to 10, the first sealing component is an O-ring.

[0090] Postscript 12

[0091] In any one of the sealing structures described in Appendix 7 to 11, the first support surface and the second support surface are disposed on the same plane.

[0092] Postscript 13

[0093] An industrial machine includes: a main body; a cover mounted on the main body; and a first sealing member sandwiched between the cover and the main body.

[0094] The industrial machinery body includes: a first support surface disposed around a grease outlet for discharging lubricant from a sealed lubricated part, covering its entire circumference; and a second support surface disposed on the outer side surrounding the first support surface, covering its entire circumference.

[0095] The cover includes: a through hole, which exposes the grease drain port when the cover is mounted on the main body of the industrial machinery; a first mating surface disposed opposite to the first support surface over its entire circumference; and a second mating surface disposed opposite to the second support surface over its entire circumference.

[0096] The first sealing member is compressed between the first mating surface and the first supporting surface, thereby sealing the area around the through hole throughout its circumference.

[0097] Explanation of reference numerals in the attached figures

[0098] 1: Robots (industrial machinery)

[0099] 2: Rotating body (main body of industrial machinery)

[0100] 4: Lubricated part

[0101] 5a: Fat removal port

[0102] 8: Support surface (first support surface)

[0103] 9: Support surface (second support surface)

[0104] 12: Cover

[0105] 13: Threaded hole

[0106] 14: First sealing component

[0107] 15: Second sealing component

[0108] 16: Through hole

[0109] 17: First mating surface

[0110] 18: Second mating surface

[0111] 19: First sealing groove

[0112] 20: Second sealing groove

[0113] 21: Bolt hole

[0114] 22: Bolt

Claims

1. A lid, characterized in that, The cover closes the space around the grease drain port in an openable manner, the grease drain port being used to discharge lubricant from the enclosed lubricated part of the industrial machinery body. The cover includes: a through hole, which exposes the grease outlet when the cover is installed on the main body of the industrial machinery; and a first mating surface, which is disposed around the through hole over the entire circumference and faces a first support surface disposed around the grease outlet over the entire circumference. And a second mating surface, which is disposed opposite to the second support surface over the entire circumference, the second support surface being located on the outer side surrounding the first support surface over the entire circumference. The first mating surface can seal the area around the through hole throughout its circumference using a first sealing member that is compressed between the first mating surface and the first support surface.

2. The cover according to claim 1, characterized in that, A first sealing groove is provided on the first mating surface. The first sealing groove surrounds the periphery of the through hole throughout its entire circumference and is capable of accommodating the first sealing component.

3. The cover according to claim 2, characterized in that, A second sealing groove is provided on the second mating surface. The second sealing groove extends over the entire circumference and is accommodated in a second sealing component that is compressed between the second mating surface and the second support surface.

4. The cap according to any one of claims 1 to 3, characterized in that, The second support surface is provided with a plurality of threaded holes spaced apart circumferentially. The second mating surface is provided with a plurality of bolt holes, which are located at positions corresponding to the threaded holes and allow the bolts to pass through.

5. The cover according to any one of claims 1 to 4, characterized in that, The first sealing component is an O-ring.

6. The cap according to any one of claims 1 to 5, characterized in that, The first mating surface and the second mating surface are disposed on the same plane.

7. A sealing structure, characterized in that, The sealing structure utilizes a cover to close the space around the grease drain port in an openable manner. The grease drain port is used to discharge lubricant from the enclosed lubricated part of the industrial machinery body. The sealing structure includes: The first support surface and the second support surface are disposed on the main body of the industrial machinery. The first support surface is disposed around the grease outlet in the entire circumference. The second support surface is disposed on the outer side of the first support surface in the entire circumference. The cover has a through hole, a first mating surface, and a second mating surface. The through hole exposes the grease drain port when the cover is installed on the main body of the industrial machinery. The first mating surface is arranged opposite to the first support surface throughout the entire circumference, and the second mating surface is arranged opposite to the second support surface throughout the entire circumference. as well as The first sealing member is compressed between the first mating surface and the first supporting surface, thereby sealing the area around the through hole throughout its circumference.

8. The sealing structure according to claim 7, characterized in that, A first sealing groove is provided on the first mating surface or the first supporting surface. The first sealing groove surrounds the grease outlet around its entire circumference and is capable of accommodating the first sealing component.

9. The sealing structure according to claim 8, characterized in that, A second sealing groove is provided on the second mating surface or the second supporting surface. The second sealing groove extends over the entire circumference and is accommodated in a second sealing component that is compressed between the second mating surface and the second supporting surface.

10. The sealing structure according to any one of claims 7 to 9, characterized in that, The second support surface is provided with a plurality of threaded holes spaced apart circumferentially. The second mating surface is provided with a plurality of bolt holes, which are located at positions corresponding to the threaded holes and allow the bolts to pass through.

11. The sealing structure according to any one of claims 7 to 10, characterized in that, The first sealing component is an O-ring.

12. The sealing structure according to any one of claims 7 to 11, characterized in that, The first support surface and the second support surface are disposed on the same plane.

13. An industrial machine, characterized in that, The industrial machinery includes: a main body; a cover mounted on the main body; and a first sealing member sandwiched between the cover and the main body. The industrial machinery body includes: a first support surface disposed around a grease outlet for discharging lubricant from a sealed lubricated part, covering its entire circumference; and a second support surface disposed on the outer side surrounding the first support surface, covering its entire circumference. The cover includes: a through hole, which exposes the grease outlet when the cover is installed on the main body of the industrial machinery; and a first mating surface, which is disposed opposite to the first support surface throughout its entire circumference. And a second mating surface, which is configured to face the second support surface across the entire circumference. The first sealing member is compressed between the first mating surface and the first supporting surface, thereby sealing the area around the through hole throughout its circumference.

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