Waterproof electric push rod

Abstract

The utility model discloses a waterproof electric push rod in the technical field of electric push rods, which comprises a driving assembly, a transmission assembly and a push rod assembly, the driving assembly drives the push rod assembly to work through the transmission assembly, the push rod assembly comprises an outer pipe, an inner pipe, a lead screw and a nut, one end of the outer pipe is provided with an end cover, and the end cover is provided with a sealing ring. A protection structure is arranged between the outer pipe and the end cover so as to improve the sealing waterproofness and stability between the outer pipe and the end cover, the dustproof ring is assembled in the first mounting groove and tightly attached to the outer wall of the inner pipe so as to prevent external dust from entering the outer pipe, and the supporting ring is assembled in the second mounting groove and makes contact with the outer wall of the inner pipe so as to prevent dust from entering the outer pipe. The bearing sleeve is arranged in the outer pipe to support and position the inner pipe and ensure stable operation of the inner pipe in the outer pipe, the oil seal ring is assembled in the third mounting groove and tightly attached to the outer wall of the inner pipe to prevent leakage of lubricating oil, and the inner wall of the bearing sleeve makes contact with the outer wall of the inner pipe to reduce friction during sliding of the inner pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod technical field, concretely is a waterproof electric push rod. BACKGROUND

[0002] Electric push rod is widely used in industrial, domestic, solar and medical equipment and other technical fields, such as on photovoltaic solar panel, there is extensive application, electric push rod is generally equipped with end cap, however, the sealing of outer tube, inner tube and end cap in electric push rod on the market is poor at present, traditional end cap adopts O ring or plane gasket sealing, only relies on material elasticity to realize axial compression, when the equipment is vibrated or temperature changes for a long time, the sealing surface is easy to produce micro gap, leading to dust intrusion along the gap, and, during the telescopic process of push rod, relative motion exists between inner tube and end cap, ordinary sealing element is easy to produce debris due to abrasion, accelerates sealing failure, and increases lubricating oil leakage probability. UTILITY MODEL CONTENTS

[0003] In order to overcome the insufficient of prior art scheme, the utility model provides a waterproof electric push rod, which can effectively solve the technical problem of poor sealing of outer tube, inner tube and end cap in electric push rod.

[0004] The utility model solves technical scheme that it adopts: a waterproof electric push rod, including drive assembly, transmission assembly and push rod assembly, drive assembly drives push rod assembly to work through transmission assembly, push rod assembly includes outer tube, inner tube, screw rod and nut, one end of outer tube is equipped with end cap, and protection structure is equipped between outer tube and end cap to improve the sealing waterproofness and stability between outer tube and end cap.

[0005] Further, the nut is screwed on the screw rod, one end of the inner tube is connected with the nut, a through hole is formed in the center of the end cap, the inner tube is arranged in the inner portion of the outer tube, and one end of the inner tube passes through the through hole and is slidably connected with the end cap, the transmission assembly drives one end of the screw rod to rotate, so that the nut moves along the axial direction of the screw rod, and the nut drives the inner tube to move up and down in the inner portion of the outer tube.

[0006] Further, the protection structure includes a dustproof ring, a support ring and an oil seal ring arranged on the inner wall of the end cap, the inner wall of the end cap is sequentially provided with a first mounting groove, a second mounting groove and a third mounting groove from top to bottom, the dustproof ring is arranged in the first mounting groove and tightly abuts against the outer wall of the inner tube to prevent external dust from entering the inner portion of the outer tube, the support ring is arranged in the second mounting groove and contacts the outer wall of the inner tube to support and position the inner tube, ensuring stable operation of the inner tube in the outer tube, and the oil seal ring is arranged in the third mounting groove and tightly abuts against the outer wall of the inner tube to prevent lubricating oil from leaking.

[0007] Further, the protection structure further comprises a bearing sleeve fitted in the outer tube, and an inner wall of the bearing sleeve is in contact with an outer wall of the inner tube to reduce friction when the inner tube slides.

[0008] Further, the end cover comprises an upper end portion and a lower end portion, an inner recess is formed in a bottom of the upper end portion, and a waterproof gasket is fitted in the inner recess, and the end cover is connected with the outer tube so that the waterproof gasket is clamped between the upper end portion and the outer tube to form an effective waterproof seal.

[0009] Further, the lower end portion of the end cover penetrates into the inner portion of the outer tube, an outer wall of the lower end portion is provided with a fourth mounting groove, and a sealing ring is mounted in the fourth mounting groove and in contact with an inner wall of the outer tube to enhance the sealing between the end cover and the outer tube.

[0010] Further, the transmission assembly comprises a gear box and a transmission gear set fitted in the gear box, and an oil blocking structure covering the transmission gear set is fitted in the gear box to prevent oil splashed on the surface of the transmission gear set from splashing or leaking when the gear rotates at high speed.

[0011] Further, the outer tube is provided with at least one oil injection hole and a plugging bolt, the plugging bolt is in threaded connection with the oil injection hole to plug the oil injection hole, and the inner tube is provided with an oil injection structure, the oil injection structure is in communication with the inner cavity of the inner tube, the oil injection hole is aligned with the oil injection structure and is injected with oil, and the oil flows into the inner portion of the inner tube through the oil injection structure.

[0012] Further, a support transmission structure is arranged between the outer tube and the gear box, an outer side of the lead screw is provided with a shaft coupling, the support transmission structure is connected with the shaft coupling to assist in maintaining the coaxiality of the shaft coupling and the lead screw, and the support transmission structure is connected with the outer tube.

[0013] Further, the driving assembly comprises a mounting box and a driving member fitted in the mounting box, the gear box is provided with a positioning column connected with the mounting box, and a waterproof gasket is arranged between the mounting box and the gear box.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The protection structure is arranged between the outer tube and the end cover to improve the sealing and waterproof performance and stability between the outer tube and the end cover, the dustproof ring is fitted in the first mounting groove and tightly abuts against the outer wall of the inner tube to prevent external dust from entering the inner portion of the outer tube, the support ring is fitted in the second mounting groove and in contact with the outer wall of the inner tube to support and position the inner tube, the stable operation of the inner tube in the outer tube is ensured, the oil seal ring is fitted in the third mounting groove and tightly abuts against the outer wall of the inner tube to prevent lubricating oil from leaking, and the inner wall of the bearing sleeve is in contact with the outer wall of the inner tube to reduce friction when the inner tube slides. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention.

[0018] Figure 3 for Figure 2 Enlarged view of the structure of section A;

[0019] Figure 4 A schematic diagram showing the structure where the outer tube and end cap are separated.

[0020] Figure 5 This is a schematic diagram of the assembly of the transmission gear set and the oil baffle structure into one unit;

[0021] Figure 6 This is a schematic diagram showing the separation of the transmission gear set and the oil baffle structure.

[0022] Figure 7 An exploded view of the internal structure of the gearbox.

[0023] Figure 8 This is an isometric view of the oil baffle structure from a top angle.

[0024] Figure 9 This is an isometric view of the oil baffle structure from a bottom angle.

[0025] Figure 10 for Figure 2 Enlarged view of the structure of section B;

[0026] Figure 11 for Figure 2 Enlarged view of the structure of section C;

[0027] Figure 12 An exploded view of the structure supporting the transmission mechanism.

[0028] Numbering on the map:

[0029] 100. Outer tube; 101. Lead screw; 102. Inner tube; 103. Nut; 104. Dustproof ring; 105. End cap; 106. Support ring; 107. Waterproof gasket; 108. Sealing ring; 109. Oil seal ring; 110. Positioning protrusion; 111. Bearing sleeve; 112. Supporting protrusion; 113. Upper end; 114. Lower end; 115. Retaining ring; 116. Mounting groove; 117. Sealing bolt; 118. Oil injection hole; 119. Oil guide nozzle; 120. Oil guide groove; 121. Connecting seat; 122. Boss part; 123. Flat ball bearing; 124. Base; 125. Coupling; 126. Mounting seat;

[0030] 200. Driver components; 201. Driver parts; 202. Mounting box;

[0031] 300. Gearbox housing; 301. Upper shell; 302. Lower shell; 303. Transmission gear set; 304. Sealing gasket; 305. Oil baffle structure; 306. Second lip; 307. Connecting protrusion; 308. First lip; 309. Positioning pin; 310. Waterproof gasket; 311. Positioning block; 312. Sealing groove; 313. Oil baffle; 314. Side baffle; 315. Hollow groove. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1-4 As shown, this utility model provides a waterproof electric actuator, including a drive assembly 200, a transmission assembly, and an actuator assembly. The drive assembly 200 drives the actuator assembly to work through the transmission assembly. The transmission assembly includes a gearbox 300 and a transmission gear set 303 mounted inside the gearbox 300. The actuator assembly includes an outer tube 100, an inner tube 102, a lead screw 101, and a nut 103. The outer tube 100 is mounted on the gearbox 300 and is a hollow tubular structure with openings at both ends. The outer tube 100 is located away from the transmission gears. One end of the assembly 303 is fitted with an end cap 105, and a through hole is provided in the center of the end cap 105. The inner tube 102 is disposed inside the outer tube 100 and is slidably connected to it. One end of the inner tube 102 passes through the through hole and is slidably connected to the end cap 105. One end of the inner tube 102 is connected to a nut 103. The nut 103 is screwed onto the lead screw 101. The transmission gear assembly 303 drives one end of the lead screw 101 to rotate, so that the nut 103 moves along the axial direction of the lead screw 101, and so that the nut 103 drives the inner tube 102 to move up and down inside the outer tube 100.

[0034] The outer tube 100 and the end cover 105 are provided with a protection structure to improve the sealing and waterproofness and stability between the outer tube 100 and the end cover 105, which comprises a dustproof ring 104, a support ring 106, an oil seal ring 109 and a bearing sleeve 111, the dustproof ring 104 is a lip dustproof ring 104, the support ring 106 is a polytetrafluoroethylene support ring 106, the oil seal ring 109 is a Y-shaped oil seal ring 109, and the bearing sleeve 111 is a self-lubricating composite copper sleeve, the self-lubricating property of the self-lubricating composite copper sleeve makes it unnecessary to add additional lubricant during operation, thereby reducing the maintenance cost, and meanwhile, the composite copper material has good wear resistance and heat conductivity, which can ensure the efficient operation of the bearing sleeve 111;

[0035] The inner wall of the end cover 105 is sequentially provided with a first mounting groove 116, a second mounting groove 116 and a third mounting groove 116 from top to bottom, the dustproof ring 104 is fitted in the first mounting groove 116 and tightly adheres to the outer wall of the inner tube 102 to prevent external dust from entering the inside of the outer tube 100, the support ring 106 is fitted in the second mounting groove 116 and contacts the outer wall of the inner tube 102 to support and position the inner tube 102, thereby ensuring the stable operation of the inner tube 102 in the outer tube 100, and the oil seal ring 109 is fitted in the third mounting groove 116 and tightly adheres to the outer wall of the inner tube 102 to prevent leakage of lubricating oil, in addition, the oil seal ring 109 can further prevent external pollutants from entering the inside of the outer tube 100;

[0036] Further comprising a fixing ring 115 for fitting the bearing sleeve 111, the top end of the fixing ring 115 is provided with a positioning protrusion 110 extending outward relative to the center of the fixing ring 115, the bottom end of the fixing ring 115 is provided with a supporting protrusion 112 extending inward relative to the center of the fixing ring 115, one end of the outer tube 100 is provided with a mounting groove 116 matching the diameter of the positioning protrusion 110, the fixing ring 115 is placed in the inside of the outer tube 100 and fixed at the position of the mounting groove 116 of the outer tube 100 by the positioning protrusion 110, and the bearing sleeve 111 is arranged in the inside of the fixing ring 115 and fixed in the inside of the fixing ring 115 by the supporting protrusion 112, so that the inner wall of the bearing sleeve 111 contacts the outer wall of the inner tube 102 and the bearing sleeve 111 can normally play its role of supporting and reducing friction;

[0037] The end cover 105 comprises an upper end portion 113 and a lower end portion 114, the bottom of the upper end portion 113 is provided with an inner recess, and the inner recess is fitted with a waterproof gasket 107, when the end cover 105 is installed and connected with the outer tube 100, the waterproof gasket 107 is clamped between the upper end portion 113 and the outer tube 100 to form an effective waterproof seal;

[0038] Meanwhile, the lower end 114 of the end cover 105 penetrates into the interior of the outer tube 100, and the outer wall of the lower end 114 is provided with a fourth mounting groove 116, and the fourth mounting groove 116 is mounted with a sealing ring 108, and the sealing ring 108 is in contact with the inner wall of the outer tube 100, further enhancing the sealing performance between the end cover 105 and the outer tube 100, preventing external moisture and impurities from entering the interior of the equipment from the connection between the end cover 105 and the outer tube 100;

[0039] As shown in Fig. 5-9, the gear box 300 comprises an upper shell 301 and a lower shell 302, the upper shell 301 and the lower shell 302 are closed to form a containing cavity for containing a transmission gear set 303, a sealing gasket 304 is arranged between the upper shell 301 and the lower shell 302, a first lip 308 is arranged around the lower end of the upper shell 301 near its periphery, a positioning block 311 is arranged around the lower end of the upper shell 301 near its inner periphery, and the first lip 308 and the positioning block 311 have a gap to form a sealing groove 312, the sealing gasket 304 is arranged inside the sealing groove 312, and a second lip 306 is arranged around the upper end of the lower shell 302 near its periphery, the upper shell 301 and the lower shell 302 are closed, the first lip 308 is in contact with the second lip 306 to achieve sealing and waterproofing;

[0040] The inside of the gear box 300 is arranged with an oil blocking structure 305 covering the transmission gear set 303 to prevent the oil smeared on the surface of the transmission gear set 303 from splashing or flowing away when the gear is rotating at high speed, the oil blocking structure 305 comprises an oil blocking plate 313 and a side blocking plate 314, the side blocking plate 314 is arranged around the side of the transmission gear set 303 to prevent the oil from flowing away from the side, the oil blocking plate 313 is arranged above the side blocking plate 314, the oil blocking plate 313 is above the transmission gear set 303, and the shape and size of the oil blocking plate 313 and the containing cavity are matched with each other, and the oil blocking plate 313 is provided with a connecting lug 307 connected with the upper shell 301 to fix the position of the oil blocking structure 305 in the gear box 300, in addition, the oil blocking plate 313 is provided with a hollow slot 315, so that the driving assembly 200 and the push rod assembly pass through the hollow slot 315 and are connected with the transmission gear set 303, the driving assembly 200 comprises a mounting box 202 and a driving member 201 arranged inside the mounting box 202, the driving member 201 is a conventional driving motor, the gear box 300 is provided with a positioning column 309 connected with the mounting box 202, and a waterproof gasket 310 is arranged between the mounting box 202 and the gear box 300;

[0041] As Figure 10As shown, the outer tube 100 is provided with at least one oil injection hole 118, each of which is equipped with a plugging bolt 117 threadedly connected thereto, the plugging bolt 117 being tightly connected with the oil injection hole 118 through threads to effectively plug the oil injection hole 118, and the inner tube 102 is provided with an oil injection structure, which is in communication with the inner cavity of the inner tube 102, and the oil injection hole 118 and the oil injection structure are precisely aligned in the axial direction after the movement of the inner tube 102, and then the grease is injected, so that the grease flows into the inner tube 102 through the oil injection structure;

[0042] The oil injection structure includes an oil guide nozzle 119 fixedly installed on the side wall of the inner tube 102, which is provided with an oil guide groove 120 in communication with the inner cavity of the inner tube 102, and the design of the oil guide groove 120 can ensure that the grease flows smoothly into the inner cavity of the inner tube 102, so that the grease is more effectively attached to the surface of the screw rod, and the efficiency of oil injection is improved;

[0043] As shown in the figure, Figures 11-12 The outer tube 100 and the gear box 300 are provided with a support transmission structure, the outer side of the lead screw 101 is sleeved with a shaft coupling 125, the driving member 201 drives the transmission gear set 303 to rotate, the transmission gear set 303 drives the lead screw 101 to rotate through the shaft coupling 125, the inside of the support transmission structure is rotatably connected with the shaft coupling 125 to support the shaft coupling 125 and ensure the stability of the rotation of the lead screw 101, and the outside of the support transmission structure is connected with the outer tube 100 to fix the position of the support transmission structure on the outer tube 100;

[0044] The support transmission structure includes a plane ball bearing 123 and a bearing seat, the bearing seat wraps the plane ball bearing 123 to protect the plane ball bearing 123 and prevent external dust and impurities from entering the bearing interior to affect its normal operation;

[0045] The gear box 300 is equipped with a mounting seat 126 for fixing the bearing seat, the bearing seat comprises a connecting seat 121 and a base 124, the base 124 is arranged inside the mounting seat 126 and is fastened with the mounting seat 126 by bolts, so that the bearing seat is fixed on the gear box 300 as a whole, and a stable mounting base is provided for the plane ball bearing 123, the bottom end of the connecting seat 121 is provided with a boss part 122, the inner wall of the boss part 122 is provided with internal threads for threaded connection with the base 124, the plane ball bearing 123 is arranged on the end face of the base 124, the connecting seat 121 is connected with the base 124 and wraps the plane ball bearing 123 inside, the bottom of the outer tube 100 is provided with a positioning groove matched with the boss part 122, and the inner wall of the outer tube 100 is provided with internal threads for threaded connection with the connecting seat 121, so that the bearing seat is fixed on the outer tube 100 by positioning and threaded connection, and the stable position of the supporting transmission structure is further ensured, so that the stability of the rotation of the lead screw 101 is further ensured.

[0046] Compared with the conventional technology:

[0047] 1. The sealing and waterproof stability between the outer tube 100 and the end cover 105 is improved by arranging the protection structure between the outer tube 100 and the end cover 105, the dustproof ring 104 is arranged inside the first mounting groove 116 and tightly abuts against the outer wall of the inner tube 102, so as to prevent external dust from entering the inside of the outer tube 100, the supporting ring 106 is arranged inside the second mounting groove 116 and contacts the outer wall of the inner tube 102, so as to support and position the inner tube 102 and ensure the stable operation of the inner tube 102 in the outer tube 100, the oil seal ring 109 is arranged inside the third mounting groove 116 and tightly abuts against the outer wall of the inner tube 102, so as to prevent the leakage of lubricating oil, and the inner wall of the bearing sleeve 111 contacts the outer wall of the inner tube 102, so as to reduce the friction when the inner tube 102 slides;

[0048] 2. The oil blocking structure 305 covering the transmission gear set 303 is arranged inside the gear box 300, so as to prevent the oil splashed on the surface of the transmission gear set 303 from splashing or flowing away when the gear rotates at high speed, and the side baffle 314 is arranged around the side of the transmission gear set 303, so as to prevent the oil from flowing away from the side, by this design, the oil is firmly retained on the surface of the gear when the gear rotates at high speed, and the gear can be fully lubricated at all times, so as to ensure its long-term stable operation, significantly prolong the service life, and the structure also greatly reduces the risk of gear wear and damage caused by poor lubrication;

[0049] 3. By setting the oil injection hole 118 on the outer tube 100 and the oil injection component on the inner tube 102, the oil injection component is the oil guide nozzle 119 fixedly installed on the side wall of the inner tube 102, the oil guide nozzle 119 is provided with the oil guide groove 120 in communication with the inner cavity of the inner tube 102, and each oil injection hole 118 is provided with the plugging bolt 117 threadedly connected therewith, the plugging bolt 117 is tightly connected with the oil injection hole 118 through the thread, so as to effectively plug the oil injection hole 118, and after moving the inner tube 102 to accurately align the oil injection hole 118 with the oil guide nozzle 119 in the axial direction, injecting the oil, so that the oil flows into the inner tube 102 through the oil guide groove 120, the design of the oil guide groove 120 can ensure that the oil flows smoothly into the inner cavity of the inner tube 102, so that the oil is more effectively attached to the surface of the screw rod, and the oil injection efficiency is improved;

[0050] 4. By setting the support transmission structure between the outer tube 100 and the gear box 300, the inside of the support transmission structure is rotatably connected with the shaft coupling 125, so as to support the shaft coupling 125 and ensure the stability of the rotation of the screw rod 101, and the outside of the support transmission structure is connected with the outer tube 100, so as to fix the position of the support transmission structure on the outer tube 100. In addition, compared with the traditional electric push rod, the planar ball bearing 123 is first placed on the end face of the base 124, the connecting seat 121 is connected with the base 124 and wraps the planar ball bearing 123 inside, and then the bearing seat is fixed on the outer tube 100 through positioning and threaded connection, so as to realize the removal of the planar ball bearing 123 from the internal space of the gear box 300, reduce the volume and weight of the gear box 300, and further reduce the overall cost, and eliminate the gap problem that may be caused by the traditional bolt connection, avoid the decrease of precision and reliability caused by the loosening of the bolt, and improve the transmission precision of the push rod from the root, and significantly enhance the performance and reliability of the whole mechanical system.

[0051] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A waterproof electric push rod, comprising a driving assembly, a transmission assembly and a push rod assembly, the driving assembly drives the push rod assembly to work through the transmission assembly, the push rod assembly comprises an outer tube, an inner tube, a lead screw and a nut, characterized in that, One end of the outer tube is equipped with an end cover, and a protection structure is arranged between the outer tube and the end cover to improve the sealing and waterproof performance and stability between the outer tube and the end cover.

2. A waterproof electric push rod according to claim 1, characterized in that, The nut is screwed on the screw rod, one end of the inner tube is connected with the nut, a through hole is arranged at the center of the end cover, the inner tube is arranged in the outer tube, one end of the inner tube passes through the through hole and is connected with the end cover in a sliding mode, and the transmission assembly drives one end of the screw rod to rotate, so that the nut moves along the axial direction of the screw rod, and the nut drives the inner tube to move up and down in the outer tube.

3. The waterproof electric push rod according to claim 1, characterized in that, The protection structure comprises a dustproof ring, a supporting ring and an oil seal ring which are equipped on the inner wall of the end cover, the inner wall of the end cover is sequentially provided with a first mounting groove, a second mounting groove and a third mounting groove from top to bottom, the dustproof ring is equipped in the first mounting groove and closely contacts with the outer wall of the inner tube to prevent external dust from entering the inner tube, the supporting ring is equipped in the second mounting groove and contacts with the outer wall of the inner tube to support and position the inner tube, thereby ensuring the stable operation of the inner tube in the outer tube, and the oil seal ring is equipped in the third mounting groove and closely contacts with the outer wall of the inner tube to prevent the leakage of lubricating oil.

4. A waterproof electric push rod according to claim 3, characterized in that, The protection structure further comprises a bearing sleeve which is equipped in the inner tube, and the inner wall of the bearing sleeve contacts with the outer wall of the inner tube to reduce the friction when the inner tube slides.

5. The waterproof electric push rod according to claim 1, wherein, The end cover comprises an upper end portion and a lower end portion, an inner recess is arranged at the bottom of the upper end portion, a waterproof gasket is equipped in the inner recess, and the end cover is connected with the outer tube, so that the waterproof gasket is clamped between the upper end portion and the outer tube to form an effective waterproof seal.

6. A waterproof electric push rod according to claim 5, characterized in that The lower end portion of the end cover penetrates into the inner tube, the outer wall of the lower end portion is provided with a fourth mounting groove, a sealing ring is arranged in the fourth mounting groove, and the sealing ring contacts with the inner wall of the outer tube to enhance the sealing performance between the end cover and the outer tube.

7. The waterproof electric push rod according to claim 1, wherein, The transmission assembly comprises a gear box and a transmission gear set which is equipped in the gear box, and an oil blocking structure is arranged in the gear box to cover the transmission gear set, so as to prevent the oil on the surface of the transmission gear set from splashing or flowing away when the gear rotates at a high speed.

8. The waterproof electric push rod according to claim 1, wherein, The outer tube is provided with at least one oil injection hole and a plugging bolt, the plugging bolt is threadedly connected with the oil injection hole to plug the oil injection hole, the inner tube is provided with an oil injection structure which is in communication with the inner cavity of the inner tube, the oil injection hole is aligned with the oil injection structure, and oil is injected into the oil injection structure, so that the oil flows into the inner tube through the oil injection structure.

9. A waterproof electric push rod according to claim 7, characterized in that, A supporting transmission structure is arranged between the outer tube and the gear box, the outer side of the screw rod is provided with a shaft coupling, the supporting transmission structure is connected with the shaft coupling to assist in maintaining the coaxiality of the shaft coupling and the screw rod, and the supporting transmission structure is connected with the outer tube.

10. The waterproof electric push rod according to claim 7, characterized in that, The driving assembly comprises a mounting box and a driving member which is equipped in the mounting box, the gear box is provided with a positioning column which is connected with the mounting box, and a waterproof gasket is arranged between the mounting box and the gear box.

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