Self-lubricating device of gear reducer

Abstract

The utility model relates to the technical field of gear speed reducers, in particular to a self-lubricating device for a gear speed reducer, which comprises a speed reducer shell, a plurality of meshed gears are arranged in the speed reducer shell, and the gears are respectively and fixedly arranged on a driving shaft and a driven shaft. At least one oil suction structure and one oil conveying structure are arranged on the two sides of the speed reducer shell. The oil suction structure comprises an oil suction pipe, the oil suction pipe penetrates through the speed reducer shell in a sliding mode, and an oil suction opening of the oil suction pipe faces the gear. The oil conveying structure comprises an oil conveying pipe which penetrates through the speed reducer shell in a sliding mode, and an oil conveying opening of the oil conveying pipe faces the gear. According to the gear speed reducer, the technical problems that gear structures at different depth positions of the gear speed reducer are lubricated, and the oil quantity in the device is automatically controlled are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear reducers, and in particular to a self-lubricating device for a gear reducer. Background Art

[0002] A gear reducer is a device used to reduce the speed of an electric motor or other drive source while increasing torque. They are widely used in industrial automation, machinery manufacturing, robotics, conveying systems, heavy equipment and many other fields. Gear reducers usually consist of one or more gear pairs, and the reduction effect is achieved through the meshing of these gear pairs. The lubrication of gear reducers is an important part of ensuring their normal operation and extending their service life. The existing lubrication method is to regularly maintain the lubrication function of the gear reducer by manually injecting lubricating oil, but it can only be judged manually whether lubricating oil needs to be injected, which can easily lead to a lack of lubricating oil in the gear reducer, causing damage to various gear components.

[0003] The Chinese utility model patent with the name of "A Self-lubricating Reducer" and the publication number CN217003032U that has been published includes a reducer body and a reducer transmission gear assembly, a transmission main shaft, a half-tooth driven air pump assembly, an oil suction pipe assembly and an oil injection pipe assembly. The transmission main shaft is connected to the oil suction pipe assembly and the oil injection pipe assembly through the half-tooth driven air pump assembly. The input end of the oil suction pipe assembly is arranged inside the reducer body, the oil suction pipe assembly is connected to the half-tooth driven air pump assembly, the oil injection pipe assembly is arranged at the top of the reducer body, and the oil injection pipe assembly is connected to the half-tooth driven air pump assembly. The device can lubricate the gears and connecting shafts in the reducer, avoid overheating or wear of parts in the reducer, and extend the service life of the reducer.

[0004] However, the oil injection pipe assembly of the device is fixed and can only inject oil at a fixed depth and position, and cannot lubricate the gear structure at various positions of the gear reducer, which will cause part of the lubricating oil to be wasted and accumulated inside the gear reducer. Utility Model Content

[0005] The purpose of the present application is to provide a self-lubricating device for a gear reducer, which solves the technical problems of lubricating the gear structure at different depths of the gear reducer and automatically controlling the amount of oil inside the device.

[0006] In order to solve the above technical problems, the solution adopted by this application is as follows:

[0007] A self-lubricating device for a gear reducer comprises a reducer housing, wherein a plurality of meshing gears are arranged in the reducer housing, wherein the gears are respectively fixedly mounted on a driving shaft and a driven shaft, and at least one oil suction structure and an oil delivery structure are arranged on both sides of the reducer housing.

[0008] Preferably, the oil suction structure includes an oil suction pipe, which is slidably passed through the reducer housing, and the oil suction port of the oil suction pipe faces the above-mentioned gear; the oil delivery structure includes an oil delivery pipe, which is slidably passed through the reducer housing, and the oil delivery port of the oil delivery pipe faces the above-mentioned gear; a sealing gasket is provided between the oil suction pipe, the oil delivery pipe and the reducer housing.

[0009] Preferably, the oil suction structure further comprises a first oil storage chamber, the oil outlet of the oil suction pipe is arranged in the first oil storage chamber, an electromagnet is arranged in the first oil storage chamber; the oil suction pipe is slidably arranged on the first oil storage chamber.

[0010] Preferably, one end of the oil suction pipe located outside the first oil storage chamber is threadedly connected with a first nut, and the oil suction pipe and the first oil storage chamber are connected via a linear guide structure.

[0011] Preferably, the oil suction structure also includes a first oil tank, which is provided with a one-way valve component, and the flow direction of the one-way valve component is from inside the first oil tank to outside the first oil tank; the first oil tank is connected to the first oil storage chamber through an oil suction pipe; a piston is provided in the first oil tank, and the piston is connected to the output end of the first motor.

[0012] Preferably, the one-way valve member includes a one-way valve cylinder, a one-way valve plate, and a spring.

[0013] Preferably, the one-way valve cylinder is fixedly mounted on the first oil tank, with one end of the one-way valve cylinder closed and the other end connected to the first oil tank; an air hole is provided on the side wall of the one-way valve cylinder, and the gas in the first oil tank is discharged into the external environment through the air hole; a one-way valve plate is slidably mounted in the one-way valve cylinder to intercept the internal cavity of the one-way valve cylinder, and the one-way valve plate is connected to the closed end of the one-way valve cylinder by a spring; when the spring is at a normal expansion and contraction amount, the position of the one-way valve plate intercepts the internal cavity of the one-way valve cylinder, and the air hole is not connected to the first oil tank, forming a closed space.

[0014] Preferably, a filter is provided at the connection point between the oil suction pipeline and the first oil storage chamber.

[0015] Preferably, a first stopper is provided on the oil suction pipe, and when the oil suction pipe moves linearly to the limit position, the first stopper contacts the inner wall of the first oil storage cavity to limit the oil suction pipe from continuing to move.

[0016] Preferably, the oil delivery structure also includes a second oil storage chamber, an oil delivery pipe is slidably arranged on the second oil storage chamber, one end of the oil delivery pipe located outside the second oil storage chamber is threadedly connected with a nut, the oil delivery pipe and the second oil storage chamber are connected by a linear guide structure, and the oil inlet of the oil delivery pipe is located in the second oil storage chamber.

[0017] Preferably, the oil delivery structure also includes a second oil tank, in which lubricating oil is stored, a piston is provided in the second oil tank, the piston is connected to the output end of the second motor, and the second oil tank is connected to the second oil storage chamber through an oil delivery pipeline.

[0018] Preferably, a second stopper is provided on the oil pipeline, and when the oil pipeline moves linearly to the limit position, the second stopper contacts the inner wall of the second oil storage cavity to limit the oil pipeline from continuing to move.

[0019] The technical solution of the present application has at least the following advantages and beneficial effects:

[0020] 1. In the utility model, the oil suction pipe and the oil delivery pipe are slidably arranged on the reducer housing, thereby adjusting the depth of the oil suction pipe and the oil delivery pipe in the reducer.

[0021] 2. In the present invention, an electromagnet is arranged in the first oil storage chamber to collect iron filings in the reducer.

[0022] 3. In the utility model, a one-way valve is provided on the first oil tank to control the connection between the inner chamber of the first oil tank and the external air, so that the gas in the chamber is discharged into the external environment in a one-way manner, thereby realizing the oil absorption function.

[0023] 4. In the utility model, the oil suction structure is provided to suck the oil from the reducer, and the oil delivery structure is provided to deliver the oil to the reducer, and the lubricating oils in the two structures will not be mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional structural schematic diagram of the oil absorption structure in the utility model;

[0025] Figure 2 It is a cross-sectional structural schematic diagram of the oil delivery structure in the utility model;

[0026] Figure 3 It is a cross-sectional structural schematic diagram of the one-way valve member in the utility model;

[0027] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of A.

[0028] In the figure: 1-reducer housing; 2-gear; 3-driving shaft; 4-driven shaft; 51-oil suction pipe; 52-first oil storage chamber; 53-first nut; 54-first oil through port; 55-first block; 57-electromagnet; 58-sealing gasket; 59-first motor; 61-oil delivery pipe; 62-second oil storage chamber; 63-second nut; 64-second oil through port; 65-second block; 66-second motor; 67-second oil tank; 68-second valve cover; 521-oil suction pipe; 591-first oil tank; 592-first valve cover; 593-one-way valve cylinder; 594-one-way valve plate; 595-spring; 621-oil delivery pipe. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. If the terms "center", "upper", "lower", "inner", "outer", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the figure, or the orientation or position relationship in which the product of the application is usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. It should also be noted that unless otherwise clearly specified and limited, if the terms "set", "install", and "connect" appear, they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] Example

[0032] Please refer to Figure 1-Figure 4 The utility model provides a self-lubricating device for a gear reducer, including a reducer housing 1, a gear 2, a driving shaft 3, a driven shaft 4, an oil suction mechanism, an oil delivery structure, and a contact sensor 596.

[0033] In the prior art, a plurality of meshing gears 2 are arranged in a reducer housing 1, and the gears 2 are respectively fixedly mounted on a driving shaft 3 and a driven shaft 4 to form a complete gear reducer as a whole.

[0034] Furthermore, at least one oil suction structure and an oil delivery structure are provided on both sides of the reducer housing 1. The oil suction structure sucks out excess lubricating oil leaving the meshing point of the gear 2 in the gear reducer. When the amount of lubricating oil in the gear reducer is low, the oil delivery structure delivers oil to the gear 2.

[0035] Furthermore, the oil suction structure includes an oil suction pipe 51 , a first oil storage chamber 52 , a first nut 53 , a first oil passage 54 , a first stopper 55 , an electromagnet 57 , and a sealing gasket 58 .

[0036] Specifically, a plurality of oil suction pipes 51 are slidably arranged on the reducer housing 1, pass through the reducer housing 1 and are adjacent to the gear 2 inside the reducer. The plurality of oil suction pipes 51 are slidably arranged in the first oil storage chamber 52. The oil suction pipes 51 pass through the first oil storage chamber 52 and the reducer housing 1 in sequence. One end of the oil suction pipe 51 located outside the first oil storage chamber 52 is threadedly connected with the first nut 53. The first nut 53 is rotatably installed on the first oil storage chamber 52. The oil suction pipe 51 is located in the first oil storage chamber 52 and is fixedly installed with a first stopper 55. The oil suction pipe 51 is located in the first oil storage chamber 52 and is provided with a first oil port 54 through the wall of the pipe.

[0037] A guide block is provided on the outer wall of the oil suction pipe 51, and a guide groove is provided in the first oil storage chamber 52, which is slidably connected to the guide block. The first nut 53 is rotated by the limiting action of the guide block and the guide groove, driving the oil suction pipe to move linearly. The first stopper 55 is used to limit the displacement limit position of the oil suction pipe 51 when it moves linearly, so as to prevent it from being separated from the first oil storage chamber 52.

[0038] Preferably, the oil suction port of the oil suction pipe 51 is close to the gear 2, which can more effectively suck out the overflowed lubricating oil and the lubricating oil mixed with iron filings outside the gear. By manually turning the first nut 53, the length of the oil suction pipe 51 extending into the reducer housing 1 can also be adjusted. The oil suction port of the oil suction pipe 51 is adjusted to different depths for gears 2 at different positions, so as to more quickly suck out the lubricating oil at different positions in the gear reducer.

[0039] The oil outlet of the oil suction pipe 51 is a first oil opening 54 opened on the wall of the oil suction pipe 51 . The oil outlet position of the oil suction pipe 51 is designed so that when the oil suction pipe 51 moves to the extreme position relative to the first oil storage chamber 52 , it is still located in the first oil storage chamber 52 .

[0040] In addition, the oil suction pipe 51 slides from the outside to the inside in sequence through the first oil storage chamber 52, and an electromagnet 57 is fixedly installed on the inner wall of the first oil storage chamber 52, and the electromagnet 57 corresponds to the oil suction pipe 51 one by one; a sealing gasket 58 is fixedly arranged on the hole surface where the oil suction pipe 51 slides relatively with the first oil storage chamber 52 and the gear reducer housing 1, so that when the oil suction pipe 51 slides, the lubricating oil will not leak into another space environment through the sliding pores thereof.

[0041] Preferably, when the oil suction pipe 51 is sucking oil, the electromagnet 57 will be activated by an electric control signal to generate magnetism, so that iron filings mixed in the lubricating oil entering the first oil storage chamber 52 through the oil suction pipe 51 are magnetically attracted by the electromagnet 57 and collected and stored in the first oil storage chamber 52. A filter is provided between the first oil storage chamber 52 and the subsequent connecting pipe to filter out the iron filings to ensure that the iron filings are only located in the first oil storage chamber 52.

[0042] The iron filings are gathered by electromagnets for easy collection.

[0043] The first oil storage chamber 52 is connected to the gear reducer housing 1 by a quick-release connector. When cleaning the iron filings in the first oil storage chamber 52 later, the oil suction pipe 51 is moved to the extreme position relative to the first oil storage chamber 52, so that the oil suction pipe 51 is separated from the gear reducer housing 1, and then the first oil storage chamber 52 is separated from the gear reducer housing 1 by the quick-release connector. Then the first oil storage chamber 52 can be removed to clean the iron filings.

[0044] The quick-release connector is a prior art, and there are various quick-release connectors with different structures on the market, such as screws, buckles, etc. This embodiment does not limit or explain them in detail.

[0045] Furthermore, the oil suction structure also includes an oil suction pipeline 521, a first motor 59, a first oil tank 591, a first valve cover 592, and a one-way valve member.

[0046] Specifically, one side of the first oil storage chamber 52 is connected to the oil suction pipe 521, and the oil suction pipe 521 includes multiple connecting pipes and a junction pipe (multiple connecting pipes are evenly arranged on the junction pipe, and the junction pipe is a single pipe), and the junction pipe is connected to the upper side wall of the first oil tank 591.

[0047] The top plate of the first oil tank 591 is provided with a first valve cover 592 which can be opened to expose the internal chamber; a piston is arranged in the chamber of the first oil tank 591, and the bottom of the piston is fixedly connected to the driving shaft of the first motor 59; the first motor 59 is fixedly arranged outside the reducer housing 1, at the bottom of the first oil tank 591, and a one-way valve is arranged on the upper side wall of the first oil tank 591.

[0048] Preferably, when the oil suction structure sucks oil, the first motor 59 drives the piston to slide back and forth in the chamber of the first oil tank 591, and continuously discharges the air in the first oil tank 591 through the one-way valve member provided at the top of the first oil tank 591, thereby changing the air pressure in the first oil tank 591 to realize pump suction.

[0049] The one-way valve controls the connection between the inner chamber of the first oil tank 591 and the external air, and the one-way valve allows the gas in the chamber of the first oil tank 591 to be discharged into the external environment in a one-way manner.

[0050] When the piston moves downward, the volume of the chamber space for oil absorption inside the first oil tank 591 increases, the air pressure decreases, and the one-way valve is closed by the internal low pressure. The internal space of the first oil tank 591 is not connected to the external air, and the first oil tank 591 pumps lubricating oil from the first oil storage chamber 52;

[0051] When the piston moves upward, the volume of the chamber space for oil absorption in the first oil tank 591 becomes smaller, and the air pressure increases. The one-way valve is opened by the internal high pressure, and the first oil tank 591 is connected to the external air. The air pressure is kept balanced, and the lubricating oil that has been pumped into the first oil tank 591 moves upward with the piston, but the liquid level will not exceed the height of the one-way valve, so it will not be pumped out of the first oil tank 591.

[0052] The piston repeats the above-mentioned action, so that the chamber in the first oil tank 591 is slowly filled with lubricating oil, thereby realizing the oil suction function of the oil suction structure; after the first oil tank 591 is filled with lubricating oil, the first valve cover 592 can be opened manually to clean the lubricating oil in the first oil tank 591.

[0053] The one-way valve element includes a one-way valve cylinder 593 , a one-way valve plate 594 , and a spring 595 .

[0054] Specifically, the one-way valve cylinder 593 is fixedly installed on the upper part of the side wall of the first oil tank 591, one end of the one-way valve cylinder 593 is closed, and the other end is connected to the first oil tank 591; the side wall of the one-way valve cylinder 593 is provided with an air hole, and the gas in the chamber of the first oil tank 591 is discharged into the external environment through the air hole. A one-way valve plate 594 is slidably installed in the one-way valve cylinder 593 to intercept the internal cavity of the one-way valve cylinder 593, and the one-way valve plate 594 is connected to the closed end of the one-way valve cylinder 593 through a spring 595. The position of the one-way valve plate 594 in the one-way valve cylinder 593 determines whether the air hole of the one-way valve is connected to the first oil tank 591, thereby controlling the one-way valve cylinder 593 to release and close the air. When the spring 595 is in the normal expansion and contraction amount, the position of the one-way valve plate 594 intercepts the internal cavity of the one-way valve cylinder 593, and is not connected to the air hole, forming a closed space.

[0055] When the oil suction structure is sucking oil, the one-way valve cylinder 593 is in a sealed state, the air hole is not connected to the internal chamber of the first oil tank 591, and the chamber space volume of the first oil tank 591 increases. At this time, the lubricating oil is sucked into the first oil tank 591 through the oil suction pipe 51 under the suction force of negative pressure; then the first motor 59 controls the piston to slide toward the top of the first oil tank 591, and the one-way valve plate 504 slides to the side of the cavity away from the first oil tank 591 due to the higher air pressure in the sealed space, so that the air hole is connected to the internal chamber of the first oil tank 591, the air pressure in the first oil tank 591 tends to be balanced, and the internal air is discharged into the external environment through the air hole.

[0056] In some embodiments, the oil delivery structure includes an oil delivery pipe 61 , a second oil storage chamber 62 , a second nut 63 , a second oil port 64 , a second stopper 65 , a second motor 66 , a second oil tank 67 , a second valve cover 68 , and an oil delivery pipeline 621 .

[0057] Furthermore, the oil delivery pipe 61 is slidably arranged on the reducer housing 1, passes through the reducer housing 1 and is adjacent to the gear 2 inside the reducer housing 1, a guide block is arranged on the outer wall of the oil delivery pipe 61, the second oil storage chamber 62 is provided with a guide groove slidably connected to the guide block, a plurality of oil delivery pipes 61 are slidably arranged in the second oil storage chamber 62, the oil delivery pipe 61 passes through the second oil storage chamber 62, one end of the oil delivery pipe 61 located outside the second oil storage chamber 62 is threadedly connected to the second nut 63, and the second nut 63 is rotatably mounted on the second oil storage chamber On the cavity 62, the oil pipe 61 is located in the cavity of the second oil storage cavity 62 and a second stopper 65 is fixedly installed. The oil pipe 61 is located in the cavity of the second oil storage cavity 62 and a second oil through port 64 is provided through the wall of the tube. The second oil through port 64 serves as the oil inlet of the oil pipe. A sealing gasket 58 is fixedly provided on the hole surface where the oil pipe 61, the second oil storage cavity 62 and the gear reducer housing 1 slide relative to each other, so that when the oil pipe 61 slides, the lubricating oil will not leak into another space environment through the sliding pores.

[0058] The cooperation between the guide block and the guide groove ensures that when the second nut rotates, the oil pipe 61 can only move linearly, and the second stopper 65 limits the movement of the oil pipe 61 to the extreme position so that it will not be separated from the second oil storage chamber 67.

[0059] One side of the second oil storage chamber 62 is connected to the oil pipeline 621, and the oil pipeline 621 includes multiple connecting pipes and a junction pipe (multiple connecting pipes are evenly arranged on the junction pipe, and the junction pipe is a single pipe). The junction pipe is connected to the upper part of the side wall of the second oil tank 67. A piston is arranged in the chamber of the second oil tank 67, and the bottom of the piston is fixedly connected to the driving shaft of the second motor 66. The second motor 66 is fixedly arranged on the outside of the reducer housing 1 and is located at the bottom of the second oil tank 67. A second valve cover 68 that can be opened and closed is fixedly arranged on the top of the second oil tank 67.

[0060] Preferably, the oil delivery structure is similar to the oil suction structure. When delivering oil, the piston moves upward from the bottom of the second oil tank 67, squeezes the lubricating oil stored in the second oil tank 67, squeezes it into the second oil storage chamber 63, and drips the new lubricating oil into the adjacent gear structure through the oil delivery pipe 61 to achieve the lubrication function.

[0061] By setting a second oil storage chamber 62 with a larger oil storage space in the oil delivery structure, a storage buffer medium is provided for the lubricating oil delivered to the reducer by the second oil tank 67, thereby preventing the pump oil pressure in the second oil tank 67 from being too high, so that the lubricating oil under high pressure is directly pumped into the relatively small pipe of the oil delivery pipe 61, causing the oil delivery pipe 61 to rupture.

[0062] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution of the present invention, and the scope of the present invention is defined by the attached claims.

Claims

1. A self-lubricating device for a gear reducer, comprising a reducer housing (1), wherein a plurality of meshing gears (2) are arranged in the reducer housing (1), wherein the gears (2) are respectively fixedly mounted on a driving shaft (3) and a driven shaft (4), wherein: At least one oil suction structure and one oil delivery structure are arranged on both sides of the reducer housing (1); The oil suction structure comprises an oil suction pipe (51), the oil suction pipe (51) is slidably inserted through the reducer housing (1), and the oil suction port of the oil suction pipe (51) faces the gear (2); the oil delivery structure comprises an oil delivery pipe (61), the oil delivery pipe (61) is slidably inserted through the reducer housing (1), and the oil delivery port of the oil delivery pipe (61) faces the gear (2); and a sealing gasket (58) is provided between the oil suction pipe (51), the oil delivery pipe (61) and the reducer housing (1).

2. According to the self-lubricating device of the gear reducer as claimed in claim 1, it is characterized in that: The oil suction structure further comprises a first oil storage chamber (52), the oil outlet of the oil suction pipe (51) is arranged in the first oil storage chamber (52), an electromagnet (57) is arranged in the first oil storage chamber (52); the oil suction pipe (51) is slidably arranged on the first oil storage chamber (52).

3. According to the self-lubricating device of the gear reducer as claimed in claim 2, it is characterized in that: One end of the oil suction pipe (51) located outside the first oil storage chamber (52) is threadedly connected to a first nut (53), and the oil suction pipe (51) and the first oil storage chamber (52) are connected via a linear guide structure.

4. The self-lubricating device of a gear reducer according to claim 1, characterized in that: The oil suction structure further comprises a first oil tank (591), a one-way valve member is provided on the first oil tank (591), and the flow direction of the one-way valve member is from inside the first oil tank (591) to outside the first oil tank (591); the first oil tank (591) is connected to the first oil storage chamber (52) via an oil suction pipeline (521); a piston is provided in the first oil tank (591), and the piston is connected to the output end of the first motor (59).

5. A self-lubricating device for a gear reducer according to claim 4, characterized in that: The one-way valve element comprises a one-way valve cylinder (593), a one-way valve plate (594), and a spring (595); The one-way valve cylinder (593) is fixedly mounted on the first oil tank (591), one end of the one-way valve cylinder (593) is closed, and the other end is connected to the first oil tank (591); an air hole is arranged on the side wall of the one-way valve cylinder (593), and the gas in the first oil tank (591) is discharged into the external environment through the air hole; a one-way valve plate (594) is slidably mounted in the one-way valve cylinder (593) to intercept the internal cavity of the one-way valve cylinder (593), and the one-way valve plate (594) is connected to the closed end of the one-way valve cylinder (593) through a spring (595); when the spring (595) is at a normal extension and contraction amount, the position of the one-way valve plate (594) intercepts the internal cavity of the one-way valve cylinder (593), and the air hole is not connected to the first oil tank (591), thereby forming a closed space.

6. The self-lubricating device of a gear reducer according to claim 4, characterized in that: A filter screen is provided at the connection point between the oil suction pipeline (521) and the first oil storage chamber (52).

7. The self-lubricating device of a gear reducer according to claim 1, characterized in that: A first stopper (55) is provided on the oil suction pipe (51). When the oil suction pipe (51) moves linearly to a limit position, the first stopper (55) contacts the inner wall of the first oil storage cavity (52), thereby limiting the oil suction pipe (51) from continuing to move.

8. The self-lubricating device of a gear reducer according to claim 1, characterized in that: The oil delivery structure also includes a second oil storage chamber (62), an oil delivery pipe (61) is slidably arranged on the second oil storage chamber (62), one end of the oil delivery pipe (61) located outside the second oil storage chamber (62) is threadedly connected with a nut, the oil delivery pipe (61) and the second oil storage chamber (62) are connected via a linear guide structure, and the oil inlet of the oil delivery pipe (61) is located in the second oil storage chamber (62).

9. A self-lubricating device for a gear reducer according to claim 8, characterized in that: The oil delivery structure also includes a second oil tank (67), in which lubricating oil is stored. A piston is provided in the second oil tank (67), and the piston is connected to the output end of the second motor (66). The second oil tank (67) is connected to the second oil storage chamber (62) via an oil delivery pipeline (621).

10. The self-lubricating device of a gear reducer according to claim 8, characterized in that: A second stopper (65) is provided on the oil delivery pipe (61). When the oil delivery pipe (61) moves linearly to a limit position, the second stopper (65) contacts the inner wall of the second oil storage chamber (62) to limit the oil delivery pipe (61) from continuing to move.

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