Oil seal with lip piece structure and production equipment and production method thereof

Abstract

The invention discloses an oil seal with a lip piece structure and production equipment and a production method thereof, and relates to the technical field of oil seals, the oil seal comprises an inner rubber body, and the inner rubber body is provided with a sealing lip and an isolation lip; the sealing lip and the isolation lip are both arranged on the transmission shaft in a sleeving mode, a grease cavity is defined by the sealing lip, the isolation lip and the transmission shaft, and the grease cavity is filled with lubricating oil; a spiral groove is formed in the sealing lip and is communicated with the grease cavity. By arranging the grease cavity and the spiral groove, along with rotation of the transmission shaft, lubricating oil in the spiral groove can flow in the spiral direction of the spiral groove, the flowability of the lubricating oil is improved, and the lubricating oil is continuously provided for the contact position between the sealing lip and the transmission shaft along with flowing of the lubricating oil; the integrity and uniformity of oil film formation at the contact position with the transmission shaft are ensured, the friction force is further reduced, and the sealing effect is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of oil seals, and in particular to an oil seal with a lip structure and a production device and a production method thereof. Background Art

[0002] An oil seal is a seal used to prevent grease leakage and keep mechanical parts lubricated; it isolates the transmission parts that need lubrication from the output parts to ensure that the lubricating oil does not leak.

[0003] In the prior art, the oil seal is generally provided with a plurality of line segment-shaped return lines on the lip to enhance the flow of grease and improve the lubrication effect between the oil seal and the transmission shaft; and the rubber part of the oil seal lip is generally injection molded, and the injection molded oil seal will have excess material on the edge of the injection molded part, forming burrs.

[0004] However, the above oil seals and production equipment still have the following defects during use:

[0005] (1) The multiple line-segment return lines are not connected, which makes it difficult for the oil in the return lines to circulate, which makes the oil film formed between the oil seal and the transmission shaft uneven; therefore, the dynamic auxiliary sealing effect generated by the oil seal during operation is poor, and the oil pushing and heat dissipation performance are weak;

[0006] (2) When burrs appear at the rubber return line of the oil seal lip, when the oil seal is installed on the drive shaft, the burrs are squeezed against the drive shaft, which will affect the sealing performance between the oil seal and the drive shaft. Summary of the invention

[0007] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an oil seal with a lip structure and its production equipment and production method, which are used to solve the problem proposed in the above-mentioned background technology that the multiple line segment-shaped return lines set in the existing oil seal are not connected, resulting in the oil in the return oil line being difficult to circulate with each other, making the oil film formed between the oil seal and the transmission shaft not uniform.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] An oil seal with a lip structure comprises an inner rubber body, on which a sealing lip and an isolating lip are arranged; the sealing lip and the isolating lip are both sleeved on a transmission shaft, a grease cavity is formed between the sealing lip, the isolating lip and the transmission shaft, and the grease cavity is filled with lubricating oil;

[0010] A spiral groove is provided on the sealing lip, and the spiral groove is communicated with the grease cavity; a first driving mechanism is provided on the inner rubber body, and the first driving mechanism is used to promote the flow of lubricating oil in the spiral groove.

[0011] Preferably, the first driving mechanism includes a piston, a connecting shaft and a diaphragm; a circulation hole and a storage chamber are provided in the inner rubber body, one end of the circulation hole is communicated with the spiral groove, and the other end of the circulation hole is communicated with the storage chamber; the piston is slidably connected to the storage chamber, and the piston divides the storage chamber into a first oil storage chamber and an air compression chamber, and the first oil storage chamber is communicated with the circulation hole; the diaphragm is arranged in the grease chamber, the connecting shaft is arranged between the diaphragm and the piston, one end of the connecting shaft is connected to the piston, and the other end of the connecting shaft is connected to the diaphragm; the diaphragm divides the grease chamber into a second oil storage chamber and an isolation chamber, the second oil storage chamber is surrounded by a sealing lip, an isolation lip, a diaphragm and a transmission shaft, the isolation chamber is surrounded by a sealing lip, an isolation lip and a diaphragm, and the isolation chamber is communicated with the first oil storage chamber through a gap between the connecting shaft and the inner rubber body.

[0012] Preferably, the oil seal also includes a skeleton, an outer rubber body and a self-tightening spring; the inner rubber body is arranged on the inner ring of the skeleton, the outer rubber body is arranged on the outer ring of the skeleton, and the self-tightening spring is sleeved on the inner rubber body; when the inner rubber body is sleeved on the transmission shaft, the self-tightening spring is used to maintain the seal between the inner rubber body and the transmission shaft.

[0013] A production device for an oil seal with a lip structure, comprising a trimming device, the trimming device is used to trim burrs at the position of a spiral groove on the oil seal; the trimming device comprises a mounting seat, a sleeve, a trimming mechanism, a second driving mechanism and a clamping mechanism; the sleeve is arranged on the mounting seat, and the oil seal sleeve is arranged on the sleeve; the clamping mechanism is used to locate the position of the oil seal; the second driving mechanism is used to drive the trimming mechanism to move along the spiral direction of the spiral groove to trim the burrs at the position of the spiral groove;

[0014] The bottom of the sleeve is provided with a guide outlet; and / or the top of the sleeve is provided with a dome.

[0015] Preferably, the trimming mechanism includes a cutter and a guide mechanism; an opening is provided on the side wall of the sleeve, and the cutter is arranged in the opening; when the second driving mechanism drives the guide mechanism to slide along the spiral groove, the guide mechanism pushes out the burrs in the spiral groove.

[0016] Preferably, the guide mechanism comprises a guide block, a first bevel and a second bevel; the guide block is arranged on the cutter, the guide block slides adaptively in the spiral groove, the first bevel is formed at the top of the guide block, and the second bevel is formed at the bottom of the guide block; when the guide block slides in the spiral groove, the inclined burrs in the spiral groove are ejected out of the spiral groove through the first bevel and the second bevel, so that the cutter cuts the burrs;

[0017] A guide section is provided at the terminal end of the spiral groove; the guide block is hinged to the cutter, and a torsion spring is provided at the hinge position between the guide block and the cutter; when the guide block moves to the terminal end of the spiral groove, the guide block slides along the guide section, so that the cutter can continue to move to cut the burrs at the terminal end of the spiral groove.

[0018] Preferably, the second driving mechanism includes a rotating mechanism and a lifting mechanism; the rotating mechanism is used to drive the sleeve to rotate, and the lifting mechanism is used to drive the oil seal to rise and fall; the rotating mechanism includes a motor, a driving gear and a driven gear; the motor is installed on a mounting seat, the driving gear is coaxially arranged on the output shaft of the motor, the driven gear is coaxially sleeved on the sleeve, and the driving gear is meshed with the driven gear.

[0019] Preferably, the lifting mechanism comprises a mounting frame and a cylinder; the cylinder is mounted on a mounting seat, an output end of the cylinder is connected to the mounting frame, and the oil seal is arranged on the mounting frame.

[0020] Preferably, the clamping mechanism comprises a threaded rod and a top plate; at least two of the threaded rods are threadedly connected to the mounting frame, and the top plate is arranged at the end of the threaded rod; the top plate is used to clamp the oil seal.

[0021] A method for producing an oil seal having a lip structure, comprising the following steps:

[0022] Step 1: Clamping and positioning: first, the oil seal is moved to the highest position by the second driving mechanism, and then the oil seal and the sleeve are coaxially positioned and clamped by the clamping mechanism;

[0023] Step 2, spiral trimming: drive the oil seal to move by the second driving mechanism until the starting section of the spiral groove and the trimming position of the trimming mechanism are in the same plane. At this time, continue to drive the oil seal down, and at the same time drive the sleeve to rotate by the second driving mechanism, so that the trimming mechanism slides along the spiral direction of the spiral groove, and the inclined burrs in the spiral groove are pushed outward and trimmed by the trimming mechanism.

[0024] Beneficial effects of the present invention:

[0025] 1. By setting the grease chamber and the spiral groove, as the transmission shaft rotates, the lubricating oil in the spiral groove can flow along the spiral direction of the spiral groove, thereby improving the fluidity of the lubricating oil. As the lubricating oil flows, the contact position between the sealing lip and the transmission shaft is continuously provided with lubricating oil, thereby ensuring the integrity and uniformity of the oil film formed at the contact position with the transmission shaft, further reducing friction and ensuring the sealing effect;

[0026] 2. By setting the first driving mechanism, when the inner rubber body is squeezed by a certain offset as the transmission shaft rotates, the transmission shaft will produce pressure changes in the grease chamber, thereby allowing the grease in the grease chamber to circulate and exchange with the grease in the spiral groove, thereby improving the fluidity of the lubricating oil;

[0027] 3. By setting up a trimming mechanism and a second driving mechanism, the trimming mechanism can be driven to slide along the spiral direction of the spiral groove to trim the burrs on the spiral groove; at the same time, as the guide block slides in the spiral groove, the burrs on the edge of the spiral groove that are inclined toward the spiral groove can be pushed out of the spiral groove, thereby facilitating the cutter to trim the burrs and improving the trimming effect; by the guide block tightly contacting the inner wall of the spiral groove, the position between the cutter and the spiral groove is limited to prevent the cutter from over-trimming. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the oil seal of the present invention;

[0030] Figure 2 It is a schematic diagram of a partially cutaway three-dimensional structure of an oil seal of the present invention;

[0031] Figure 3 It is a three-dimensional enlarged structural schematic diagram of a partial structure of the first driving mechanism of the present invention;

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the trimming device of the present invention;

[0033] Figure 5 It is a partially cutaway three-dimensional structural schematic diagram of the trimming device of the present invention;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention;

[0035] Figure 7 It is a schematic diagram of a three-dimensional enlarged structure of the sleeve of the present invention;

[0036] Figure 8 It is a partially cutaway three-dimensional enlarged structural schematic diagram of the sleeve of the present invention;

[0037] Fig. 9 It is a schematic diagram of a three-dimensional enlarged structure of the guide block of the present invention;

[0038] Fig.10 It is a flow chart of the method of the present invention.

[0039] In the figure: 1. oil seal; 11. frame; 12. outer rubber body; 13. inner rubber body; 14. self-tightening spring; 15. sealing lip; 16. isolating lip; 17. grease chamber; 18. spiral groove; 19. first driving mechanism; 191. flow hole; 192. storage chamber; 193. piston; 194. connecting shaft; 195. diaphragm; 2. trimming device; 21. mounting seat; 22. sleeve; 23. trimming mechanism; 231 , cutter; 232, guide mechanism; 2321, guide block; 2322, first bevel; 2323, second bevel; 2324, guide section; 24, second driving mechanism; 241, rotating mechanism; 2411, motor; 2412, driving gear; 2413, driven gear; 242, lifting mechanism; 2421, mounting frame; 2422, cylinder; 25, clamping mechanism; 251, threaded rod; 252, top plate. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1-3 As shown, an oil seal with a lip structure, such as Figure 1-2 As shown, it includes an inner rubber body 13, on which a sealing lip 15 and an isolating lip 16 are arranged; the sealing lip 15 and the isolating lip 16 are both sleeved on the transmission shaft, and a grease cavity 17 is formed between the sealing lip 15, the isolating lip 16 and the transmission shaft, and the grease cavity 17 is filled with lubricating oil; a spiral groove 18 is opened on the sealing lip 15, and the spiral groove 18 is connected to the grease cavity 17; a first driving mechanism 19 is arranged on the inner rubber body 13, and the first driving mechanism 19 is used to promote the flow of lubricating oil in the spiral groove 18.

[0042] It should be noted that when the oil seal 1 is sleeved on the transmission shaft for use, the contact area between the sealing lip 15 and the transmission shaft can be reduced by setting the spiral groove 18, thereby reducing the friction force; and as the transmission shaft rotates, the lubricating oil in the spiral groove 18 can flow along the spiral direction of the spiral groove 18, thereby improving the fluidity of the lubricating oil. As the lubricating oil flows, the contact position between the sealing lip 15 and the transmission shaft is continuously provided with lubricating oil, thereby ensuring the integrity and uniformity of the oil film formed at the contact position with the transmission shaft, further reducing the friction force, and ensuring the sealing effect;

[0043] When the inner rubber body 13 is squeezed to a certain extent as the transmission shaft rotates, the transmission shaft will cause pressure changes in the grease chamber 17, thereby allowing the grease in the grease chamber 17 to circulate and exchange with the grease in the spiral groove 18, thereby improving the fluidity of the lubricating oil.

[0044] like Figure 1-3 As shown, the first driving mechanism 19 includes a piston 193, a connecting shaft 194 and a diaphragm 195; a flow hole 191 and a storage chamber 192 are provided in the inner rubber body 13, one end of the flow hole 191 is connected to the spiral groove 18, and the other end of the flow hole 191 is connected to the storage chamber 192; the piston 193 is slidably connected to the storage chamber 192, and the piston 193 divides the storage chamber 192 into a first oil storage chamber and an air compression chamber, and the first oil storage chamber is connected to the flow hole 191; the diaphragm 195 is arranged in the grease chamber 17, and the connecting shaft 194 is connected to the air compression chamber 17 ... 94 is arranged between the diaphragm 195 and the piston 193, one end of the connecting shaft 194 is connected to the piston 193, and the other end of the connecting shaft 194 is connected to the diaphragm 195; the diaphragm 195 divides the grease chamber 17 into a second oil storage chamber and an isolation chamber, the second oil storage chamber is surrounded by the sealing lip 15, the isolation lip 16, the diaphragm 195 and the transmission shaft, the isolation chamber is surrounded by the sealing lip 15, the isolation lip 16 and the diaphragm 195, and the isolation chamber is connected to the first oil storage chamber through the gap between the connecting shaft 194 and the inner rubber body 13.

[0045] It should be noted that when the transmission shaft squeezes the grease chamber 17, a certain thrust will be generated on the lubricating oil in the grease chamber 17, and at the same time, the lubricating oil will transfer the thrust to the isolation chamber, so that the pressure in the isolation chamber increases, thereby pushing the connecting shaft 194 to move, and pushing the piston 193 to move through the connecting shaft 194; at the same time, as the transmission shaft squeezes the grease chamber 17, the lubricating oil in the grease chamber 17 will enter the flow hole 191 through the spiral groove 18, and be introduced into the first oil storage chamber through the flow hole 191, thereby accelerating the flow of the lubricating oil in the spiral groove 18, increasing the oil flow rate, and facilitating the replenishment of the lubricating oil to the contact position with the transmission shaft, thereby ensuring the uniformity of the oil film; when the piston 193 moves, the air compression chamber will be compressed. When the transmission shaft returns to the center, the pressure recovery of the air compression chamber will push the piston 193 to reset, thereby causing the lubricating oil in the spiral groove 18 to flow in the opposite direction.

[0046] like Figure 1-2 As shown, the oil seal 1 also includes a skeleton 11, an outer rubber body 12 and a self-tightening spring 14; the inner rubber body 13 is arranged on the inner ring of the skeleton 11, the outer rubber body 12 is arranged on the outer ring of the skeleton 11, and the self-tightening spring 14 is sleeved on the inner rubber body 13; when the inner rubber body 13 is sleeved on the transmission shaft, the self-tightening spring 14 is used to maintain the seal between the inner rubber body 13 and the transmission shaft.

[0047] like Figure 1-9As shown, a production device for an oil seal with a lip structure, such as Figure 1-2 and Figure 4-5 As shown, it includes a trimming device 2, which is used to trim the burrs at the position of the spiral groove 18 on the oil seal 1; the trimming device 2 includes a mounting seat 21, a sleeve 22, a trimming mechanism 23, a second driving mechanism 24 and a clamping mechanism 25; the sleeve 22 is arranged on the mounting seat 21, and the oil seal 1 is sleeved on the sleeve 22; the clamping mechanism 25 is used to locate the position of the oil seal 1; the second driving mechanism 24 is used to drive the trimming mechanism 23 to move along the spiral direction of the spiral groove 18 to trim the burrs at the position of the spiral groove 18; the bottom of the sleeve 22 is provided with a guide outlet; and / or the top of the sleeve 22 is provided with a dome.

[0048] It should be noted that the oil seal 1 is first coaxially positioned above the sleeve 22 by the clamping mechanism 25, and then the starting end of the spiral groove 18 on the oil seal 1 is driven by the second driving mechanism 24 to be in the same plane as the trimming mechanism 23; then the oil seal 1 is driven to descend, and the sleeve 22 is driven to rotate by the second driving mechanism 24, so that the trimming mechanism 23 slides along the spiral direction of the spiral groove 18, thereby trimming the burrs on the spiral groove 18.

[0049] like Figure 2 and Figure 5 As shown, the trimming mechanism 23 includes a cutter 231 and a guide mechanism 232; an opening is provided on the side wall of the sleeve 22, and the cutter 231 is arranged in the opening; when the second driving mechanism 24 drives the guide mechanism 232 to slide along the spiral groove 18, the guide mechanism 232 pushes out the burrs in the spiral groove 18.

[0050] It should be noted that the oil seal 1 is driven to descend by the second driving mechanism 24 until the starting end of the spiral groove 18 is in the same plane with the trimming mechanism 23, that is, the guide mechanism 232 is in the same plane with the starting section of the spiral groove 18. As the oil seal 1 is driven to descend, the sleeve 22 is driven to rotate at the same time, so that the guide mechanism 232 slides along the spiral direction of the spiral groove 18, and the burrs in the spiral groove 18 are pushed out by the guide mechanism 232, so that the cutter 231 can trim the burrs at the position of the spiral groove 18. At the same time, since the spiral groove 18 is a flexible structure, the spiral groove 18 can be clamped by the cooperation of the guide mechanism 232 and the clamping mechanism 25, which can prevent the cutter 231 from over-trimming and ensure the trimming effect.

[0051] like Figure 5 and Figure 7-9As shown, the guide mechanism 232 includes a guide block 2321, a first bevel 2322 and a second bevel 2323; the guide block 2321 is provided on the cutter 231, the guide block 2321 slides in the spiral groove 18 in a matching manner, the first bevel 2322 is formed at the top of the guide block 2321, and the second bevel 2323 is formed at the bottom of the guide block 2321; when the guide block 2321 slides in the spiral groove 18, the first bevel 2322 and the second bevel 2323 are used to move the spiral groove 18 into the spiral groove 18. The inclined burr is pushed out of the spiral groove 18 so that the cutter 231 can cut the burr; a guide section 2324 is provided at the terminal end of the spiral groove 18; the guide block 2321 is hinged to the cutter 231, and a torsion spring is provided at the hinge position between the guide block 2321 and the cutter 231; when the guide block 2321 moves to the terminal end of the spiral groove 18, the guide block 2321 slides along the guide section 2324, so that the cutter 231 can continue to move to cut the burr at the terminal end of the spiral groove 18.

[0052] It should be noted that the guide block 2321 slides closely against the inner wall of the spiral groove 18. By setting the first bevel angle 2322 and the second bevel angle 2323, the guide block 2321 as a whole is similar to a conical structure. As the guide block 2321 slides in the spiral groove 18, the burrs on the edge of the spiral groove 18 that are inclined toward the inside of the spiral groove 18 can be pushed out of the spiral groove 18, thereby facilitating the cutter 231 to trim the burrs and improving the trimming effect. By closely contacting the guide block 2321 with the inner wall of the spiral groove 18, the position between the cutter 231 and the spiral groove 18 is limited, preventing the cutter 231 from trimming excessively.

[0053] When the guide block 2321 moves to the end of the spiral groove 18, since the cutter 231 is set behind the guide block 2321, if the guide block 2321 moves to the end of the spiral groove 18 and cannot move, the cutter 231 will not trim the burrs at the end of the spiral groove 18; therefore, through the setting of the guide section 2324, the guide block 2321 can continue to slide, and then the cutter 231 can trim the burrs at the end of the spiral groove 18, thereby improving the trimming efficiency.

[0054] like Figure 4-6As shown, the second driving mechanism 24 includes a rotating mechanism 241 and a lifting mechanism 242; the rotating mechanism 241 is used to drive the sleeve 22 to rotate, and the lifting mechanism 242 is used to drive the oil seal 1 to rise and fall; it can be understood that the present application does not limit the specific structure and installation method of the rotating mechanism 241 and the lifting mechanism 242, and only one feasible specific scheme is provided below: the rotating mechanism 241 includes a motor 2411, a driving gear 2412 and a driven gear 2413; the motor 2411 is installed on the mounting seat 21, the driving gear 2412 is coaxially arranged on the output shaft of the motor 2411, the driven gear 2413 is coaxially sleeved on the sleeve 22, and the driving gear 2412 is meshed with the driven gear 2413; the lifting mechanism 242 includes a mounting frame 2421 and a cylinder 2422; the cylinder 2422 is installed on the mounting seat 21, the output end of the cylinder 2422 is connected to the mounting frame 2421, and the oil seal 1 is arranged on the mounting frame 2421.

[0055] It should be noted that the motor 2411 drives the driving gear 2412 to rotate, which in turn drives the driven gear 2413 to rotate, and the driven gear 2413 drives the sleeve 22 to rotate; at the same time, the cylinder 2422 drives the oil seal 1 on the mounting frame 2421 to rise and fall, and through the cooperation of the rotating mechanism 241 and the lifting mechanism 242, the trimming mechanism 23 is driven to trim along the spiral direction of the spiral groove 18; a controller is also provided on the mounting seat 21, and the controller is a prior art, which is not shown in the figure and will not be described again; the controller is electrically connected to the motor 2411 and the cylinder 2422, respectively, and is used to synchronously control the operation of the rotating mechanism 241 and the lifting mechanism 242.

[0056] like Figure 4-6 As shown, it can be understood that the present application does not limit the specific structure and installation method of the clamping mechanism 25, and only one feasible solution is provided below; the clamping mechanism 25 includes a threaded rod 251 and a top plate 252; at least two threaded rods 251 are threadedly connected to the mounting frame 2421, and the top plate 252 is arranged at the end of the threaded rod 251; the top plate 252 is used to clamp the oil seal 1.

[0057] It should be noted that the outer diameter of the sleeve 22 is the same as the inner diameter of the oil seal 1. When clamping and positioning the oil seal 1, the oil seal 1 is first sleeved on the sleeve 22, and then the multiple threaded rods 251 are rotated respectively so that the multiple top plates 252 clamp and fix the oil seal 1; in order to further improve the clamping and positioning effect coaxial with the sleeve 22, the clamping mechanism 25 can be replaced by a three-jaw chuck structure to achieve self-centering clamping. The three-jaw chuck structure is a prior art and is not drawn in the figure and will not be described in detail.

[0058] like Figure 1-10 As shown, a method for producing an oil seal with a lip structure comprises the following steps:

[0059] Step 1: Clamping and positioning: first, the oil seal 1 is moved to the highest position by the second driving mechanism 24, and then the oil seal 1 and the sleeve 22 are coaxially positioned and clamped by the clamping mechanism 25;

[0060] Step 2, spiral trimming: the oil seal 1 is driven to move by the second driving mechanism 24 until the starting section of the spiral groove 18 and the trimming position of the trimming mechanism 23 are in the same plane. At this time, the oil seal 1 continues to be driven downward, and the sleeve 22 is driven to rotate by the second driving mechanism 24, so that the trimming mechanism 23 slides along the spiral direction of the spiral groove 18, and the inclined burrs in the spiral groove 18 are pushed outward and trimmed by the trimming mechanism 23.

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An oil seal with a lip structure, comprising an inner rubber body (13), wherein the inner rubber body (13) is provided with a sealing lip (15) and an isolation lip (16); characterized in that: The sealing lip (15) and the isolation lip (16) are both sleeved on the transmission shaft, and a grease cavity (17) is formed between the sealing lip (15), the isolation lip (16) and the transmission shaft, and the grease cavity (17) is filled with lubricating oil; The sealing lip (15) is provided with a spiral groove (18), and the spiral groove (18) is communicated with the grease chamber (17); the inner rubber body (13) is provided with a first driving mechanism (19), and the first driving mechanism (19) is used to promote the flow of lubricating oil in the spiral groove (18).

2. The oil seal with a lip structure according to claim 1, characterized in that: The first driving mechanism (19) comprises a piston (193), a connecting shaft (194) and a diaphragm (195); a circulation hole (191) and a storage chamber (192) are provided in the inner rubber body (13); one end of the circulation hole (191) is communicated with the spiral groove (18), and the other end of the circulation hole (191) is communicated with the storage chamber (192); the piston (193) is slidably connected to the storage chamber (192), and the piston (193) divides the storage chamber (192) into a first oil storage chamber and an air compression chamber, and the first oil storage chamber is communicated with the circulation hole (191); the diaphragm (195) is arranged in the grease chamber (17), and the connecting shaft (194) is arranged in the grease chamber (17). A connecting shaft (194) is arranged between the diaphragm (195) and the piston (193); one end of the connecting shaft (194) is connected to the piston (193), and the other end of the connecting shaft (194) is connected to the diaphragm (195); the diaphragm (195) divides the grease chamber (17) into a second oil storage chamber and an isolation chamber; the second oil storage chamber is surrounded by a sealing lip (15), an isolation lip (16), the diaphragm (195) and a transmission shaft; the isolation chamber is surrounded by a sealing lip (15), an isolation lip (16) and the diaphragm (195), and the isolation chamber is connected to the first oil storage chamber through a gap between the connecting shaft (194) and the inner rubber body (13).

3. The oil seal with a lip structure according to claim 2, characterized in that: The oil seal with a lip structure also includes a frame (11), an outer rubber body (12) and a self-tightening spring (14); the inner rubber body (13) is arranged on the inner ring of the frame (11), the outer rubber body (12) is arranged on the outer ring of the frame (11), and the self-tightening spring (14) is sleeved on the inner rubber body (13); when the inner rubber body (13) is sleeved on the transmission shaft, the self-tightening spring (14) is used to maintain the seal between the inner rubber body (13) and the transmission shaft.

4. The production equipment of an oil seal with a lip structure according to any one of claims 1 to 3, characterized in that: The invention comprises a trimming device (2), wherein the trimming device (2) is used to trim burrs at the position of a spiral groove (18) on an oil seal (1); the trimming device (2) comprises a mounting seat (21), a sleeve (22), a trimming mechanism (23), a second driving mechanism (24) and a clamping mechanism (25); the sleeve (22) is arranged on the mounting seat (21), and the oil seal (1) is sleeved on the sleeve (22); the clamping mechanism (25) is used to locate the position of the oil seal (1); the second driving mechanism (24) is used to drive the trimming mechanism (23) to move along the spiral direction of the spiral groove (18) to trim the burrs at the position of the spiral groove (18); The bottom of the sleeve (22) is provided with a guide outlet; and / or the top of the sleeve (22) is provided with a dome.

5. The production equipment of an oil seal with a lip structure according to claim 4, characterized in that: The trimming mechanism (23) comprises a cutter (231) and a guide mechanism (232); an opening is provided on the side wall of the sleeve (22), and the cutter (231) is arranged in the opening; when the second driving mechanism drives the guide mechanism (232) to slide along the spiral groove (18), the guide mechanism (232) pushes out the burrs in the spiral groove (18).

6. The production equipment of an oil seal with a lip structure according to claim 5, characterized in that: The guide mechanism (232) comprises a guide block (2321), a first bevel (2322) and a second bevel (2323); the guide block (2321) is arranged on the cutter (231), the guide block (2321) slides adaptively on the spiral groove (18), the first bevel (2322) is formed at the top of the guide block (2321), and the second bevel (2323) is formed at the bottom of the guide block (2321); when the guide block (2321) slides in the spiral groove (18), the inclined burrs in the spiral groove (18) are pushed out of the spiral groove (18) by the first bevel (2322) and the second bevel (2323), so that the cutter (231) cuts the burrs; The terminal end of the spiral groove (18) is provided with a guide section (2324); the guide block (2321) is hinged to the cutter (231), and a torsion spring is provided at the hinge position between the guide block (2321) and the cutter (231); when the guide block (2321) moves to the terminal end of the spiral groove (18), the guide block (2321) slides along the guide section (2324), so that the cutter (231) can continue to move to cut the burrs at the terminal end of the spiral groove (18).

7. The production equipment of an oil seal with a lip structure according to claim 4, characterized in that: The second driving mechanism (24) comprises a rotating mechanism (241) and a lifting mechanism (242); the rotating mechanism (241) is used to drive the sleeve (22) to rotate, and the lifting mechanism (242) is used to drive the oil seal (1) to rise and fall; the rotating mechanism (241) comprises a motor (2411), a driving gear (2412) and a driven gear (2413); the motor (2411) is mounted on a mounting seat (21), the driving gear (2412) is coaxially arranged on an output shaft of the motor (2411), the driven gear (2413) is coaxially sleeved on the sleeve (22), and the driving gear (2412) is meshed with the driven gear (2413).

8. The production equipment of an oil seal with a lip structure according to claim 7, characterized in that: The lifting mechanism (242) comprises a mounting frame (2421) and a cylinder (2422); the cylinder (2422) is mounted on a mounting seat (21), an output end of the cylinder (2422) is connected to the mounting frame (2421), and the oil seal (1) is arranged on the mounting frame (2421).

9. The production equipment of an oil seal with a lip structure according to claim 4, characterized in that: The clamping mechanism (25) comprises a threaded rod (251) and a top plate (252); at least two of the threaded rods (251) are threadedly connected to the mounting frame (2421), and the top plate (252) is arranged at the end of the threaded rod (251); the top plate (252) is used to clamp the oil seal (1).

10. The method for producing an oil seal with a lip structure according to any one of claims 4 to 9, characterized in that: The following steps are involved: Step 1: Clamping and positioning: first, the oil seal (1) is moved to the highest position by the second driving mechanism (24), and then the oil seal (1) and the sleeve (22) are coaxially positioned and clamped by the clamping mechanism (25); Step 2, spiral trimming: the oil seal (1) is driven to move by the second driving mechanism (24) until the starting section of the spiral groove (18) and the trimming position of the trimming mechanism (23) are in the same plane, at which time the oil seal (1) is driven to descend, and at the same time, the sleeve (22) is driven to rotate by the second driving mechanism (24), so that the trimming mechanism (23) slides along the spiral direction of the spiral groove (18), and the inclined burrs in the spiral groove (18) are pushed outward and trimmed by the trimming mechanism (23).

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