Limiting tool for press fitting of oil seal

Abstract

The invention relates to the technical field of oil seal press fitting, in particular to a limiting tool for oil seal press fitting, which comprises a tool main body, a gear shaft is clamped on the outer wall of the tool main body, the tool main body is sleeved with a lantern ring, an oil seal is arranged in the lantern ring, the interior of the tool main body is slidably connected with a push-down column, and the push-down column is slidably connected with the gear shaft. The outer pushing block tightly abuts against the inner wall of the gear shaft through a mechanical structure driven by the rocker, so that the tool body is stably fixed in the gear shaft, the oil seal positioned by the tool body can be kept in the positioning state in the gear shaft in the process that the tray is turned over by 180 degrees, the oil seal cannot fall off due to the gravity effect, and the oil seal quality is improved. The problem of positioning failure caused by overturning in a traditional process is avoided, repeated operation is reduced, process continuity is improved, and synchronous press fitting of oil seals on the two sides can be achieved through the synergistic effect of an upper pressing head and a lower pressing head which are externally connected with a pressing device after an upper gear shaft and a lower gear shaft of a tray are both installed and positioned. And the total pressing time is greatly shortened.

Description

Technical Field

[0001] This invention relates to the field of oil seal press-fitting technology, specifically to a limiting tooling for oil seal press-fitting. Background Technology

[0002] As a key sealing component in the transmission system, the quality of oil seal pressing directly affects the sealing performance and service life of the equipment. In the processing of pallet-type workpieces with double toothed shaft structures, the accuracy and efficiency of oil seal pressing are particularly important.

[0003] Dual-shaft structures involve multi-shaft synchronous transmission, with a compact shaft layout and extremely high precision requirements. The oil seals must precisely fit the end faces, shoulders, and housing mounting grooves of the dual shafts. If coaxiality deviations or uneven stress on the end faces occur during press-fitting, it can easily lead to deformation of the oil seal lips and damage to the sealing surface, thereby compromising the sealing integrity of the dual-shaft linkage, causing lubricant leakage or impurity intrusion, and affecting the stability of the transmission system. When processing workpieces requiring oil seals on both shafts, current mainstream press-fitting methods are limited by the structural design and positioning of traditional press-fitting equipment. Currently, a common operation mode is single-sided step-by-step press-fitting with manual flipping for supplementary installation. During press-fitting, the operator must first fix the workpiece in a single-direction press-fitting position. After pressing one side of the oil seal, the entire workpiece must be manually or with the aid of auxiliary tooling for recalibration. The step-by-step operation mode of pressing the oil seal on one side after the other side is in place has multiple drawbacks. On the one hand, the flipping process not only adds extra time to the process, but also prevents the oil seals on both sides from being pressed synchronously, directly resulting in a significant reduction in pressing efficiency. On the other hand, during the workpiece flipping process, the oil seal on the one side that has already been pressed may undergo slight deformation due to uneven force and misalignment of the positioning reference, or the sealing lip may be scratched due to contact with the tooling table during flipping. At the same time, the secondary positioning calibration is difficult to completely guarantee the coaxiality of the two axes and the parallelism of the oil seal mounting surface, which indirectly increases the risk of dimensional deviation in oil seal pressing and lays hidden dangers for subsequent sealing performance failure. In addition, in the traditional pressing process, the cleaning of impurities and lubrication of the oil seal surface are mostly done manually, which not only increases the labor intensity of the operators, but also adds to the operation process. Summary of the Invention

[0004] The purpose of this invention is to provide a limiting fixture for oil seal press-fitting. This addresses the problem mentioned in the background section that existing limiting press-fitting processes generally employ a single-sided, step-by-step press-fitting method combined with manual flipping and re-fitting, resulting in low press-fitting efficiency and negatively impacting the press-fitting sealing performance.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a limiting fixture for oil seal press-fitting, comprising a fixture body, a gear shaft being snapped onto the outer wall of the fixture body, a collar being fitted onto the fixture body, an oil seal being disposed inside the collar, a push post being slidably connected inside the fixture body, a tightening mechanism being disposed on the push post, the tightening mechanism including a wedge-shaped member fixedly connected to the bottom of the push post, a drive member being rotatably connected to the fixture body, a crank arm being fixedly connected to the bottom of the drive member, a rocker arm being fixedly connected to the end of the drive member away from the crank arm, and a rocker arm being rotatably connected to the end of the push post at the end of the drive member away from the drive member, a plurality of push blocks being slidably connected inside the fixture body, a side groove being formed on the push block, the wedge-shaped member being slidably connected to the side groove, and a top cover being fixedly connected to the outer wall of the fixture body, the top cover being disposed on a lubrication mechanism.

[0006] Preferably, the lubrication mechanism includes lubricating components fixedly connected to both sides of the top cover. A spray pipe is provided through the interior of each of the two lubricating components. A spray cylinder is fixedly connected to one end of the spray pipe inside the lubricating component. A lower rod is slidably connected inside the spray cylinder. An upper rod is slidably connected to the end of the lower rod away from the spray cylinder. A top ring is fixedly connected to the end of the upper rod.

[0007] Preferably, a pressing spring is fixedly connected to the outer wall of the top ring, and the end of the pressing spring away from the top ring contacts the outer wall of the lower rod. The end of the spray pipe located outside the lubricating component is connected to a nozzle, and an upper nozzle is provided on the nozzle.

[0008] Preferably, the lubricating component has an air storage chamber and an oil storage chamber fixedly connected inside, the air storage chamber is connected to an air supply pipe, the nozzle is connected to an air jet pipe, the end of the air supply pipe away from the air storage chamber is connected to the air jet pipe, and the end of the air jet pipe is provided with a lower nozzle.

[0009] Preferably, the gas supply pipe is provided with a switch box, and a flip shaft is rotatably connected inside the switch box. Baffles are provided on both sides of the flip shaft. A gear is fixedly connected to the end of the flip shaft. A rack is slidably connected to the back of the switch box. The rack and the gear are meshed. A return spring is fixedly connected to the outer wall of the rack. A push plate is rotatably connected to the end of the rack. A blocking member is fixedly connected to the bottom of the push plate. The end of the blocking member away from the push plate is fixedly connected to the outer wall of the rack.

[0010] Preferably, a mounting plate is fixedly connected to the outer side wall of the top ring, and an outward pusher is fixedly connected to the mounting plate, with an inclined surface at the end of the outward pusher.

[0011] Preferably, an oil delivery pipe is provided inside the oil storage chamber, and the end of the oil delivery pipe away from the oil storage chamber is connected to the inside of the nozzle.

[0012] Preferably, the lubricating element has a sliding connection to a lower pressure block inside, and one end of the lower pressure block inside the lubricating element contacts the top ring.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The mechanical structure driven by the rocker arm achieves a tight contact between the push block and the inner wall of the gear shaft, so that the main body of the tooling is stably fixed inside the gear shaft. After the oil seal is positioned by the main body of the tooling, it can remain in the position within the gear shaft during the 180-degree rotation of the pallet and will not fall off due to gravity. This avoids the positioning failure problem caused by rotation in traditional processes, reduces repetitive work, and improves the continuity of the process. Combined with the upper and lower pressure heads of the external pressing device, the oil seals on both sides can be pressed synchronously through the synergistic action of the upper and lower pressure heads after the upper and lower gear shafts on the pallet have been installed and positioned. Compared with the traditional single-sided multi-stage pressing mode, the total pressing time is greatly shortened.

[0014] 2. During the pressing process, high-pressure gas can be automatically injected through the linkage of the mechanical structure to completely blow away impurities attached to the oil seal surface, avoiding wear caused by impurities on the oil seal surface during pressing. After the impurities are cleaned, lubricating oil can be accurately injected simultaneously to provide uniform lubrication for oil seal pressing, effectively improving the sealing performance of the oil seal after pressing and extending the service life of the workpiece. Compared with manual cleaning and lubrication, it not only improves efficiency but also avoids the uncertainty of human operation and ensures the stability of processing quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the oil seal and tooling body in the installation state of the present invention; Figure 3 This is a schematic diagram of the internal structure of the tooling body of the present invention; Figure 4 This is a schematic diagram of the push-down column structure of the present invention; Figure 5 This is a partial structural diagram of the lubricating component of the present invention; Figure 6 This is a partial structural diagram of the tooling body of the present invention; Figure 7 for Figure 6 Enlarged view of A in the middle; Figure 8 This is a schematic diagram of the spray nozzle structure of the present invention; Figure 9 for Figure 8 Enlarged view of B in the middle; Figure 10 This is a schematic diagram of the internal structure of the nozzle of the present invention; Figure 11 This is a schematic diagram of the tooling body and gear shaft in the installation state of the present invention; Figure 12 This is a partial structural diagram of the present invention; Figure 13 This is a schematic diagram of the crimped state structure of the present invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Tooling body; 2. Outer push block; 3. Top cover; 4. Lubricating component; 5. Lower pressure block; 6. Wedge-shaped component; 7. Rocker arm; 8. Collar; 9. Oil seal; 10. Drive component; 11. Crank arm; 12. Lower push column; 13. Air storage chamber; 14. Oil storage chamber; 15. Air supply pipe; 16. Switch box; 17. Tilting shaft; 18. Baffle; 19. Nozzle; 20. Nozzle head; 21. Spray cylinder; 22. Top ring; 23. Pressing spring; 24. Upper rod; 25. Lower rod; 26. Mounting plate; 27. Outer push component; 28. Inclined surface; 29. ​​Gear; 30. Rack; 31. Return spring; 32. Push plate; 33. Blocking component; 34. Upper nozzle; 35. Gear shaft; 36. Oil supply pipe; 37. Lower nozzle; 38. Air jet pipe. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figure 1 - Figure 13 A limiting fixture for oil seal press fitting includes a fixture body 1, a gear shaft 35 snapped onto the outer wall of the fixture body 1, a collar 8 fitted on the fixture body 1, an oil seal 9 disposed inside the collar 8, a push post 12 slidably connected inside the fixture body 1, a tensioning mechanism disposed on the push post 12, the tensioning mechanism including a wedge 6 fixedly connected to the bottom of the push post 12, a drive member 10 rotatably connected to the fixture body 1, a crank arm 11 fixedly connected to the bottom of the drive member 10, a rocker arm 7 fixedly connected to the end of the drive member 10 away from the crank arm 11, the end of the crank arm 11 away from the drive member 10 rotatably connected to the end of the push post 12, a plurality of push blocks 2 slidably connected inside the fixture body 1, the push blocks 2 having side grooves, the wedge 6 slidably connected to the side grooves, and a top cover 3 fixedly connected to the outer wall of the fixture body 1, the top cover 3 being provided with a lubrication mechanism.

[0019] The lubrication mechanism includes lubrication components 4 fixedly connected to both sides of the top cover 3. Both sides of the lubrication components 4 have a nozzle 19 running through them. One end of the nozzle 19 located inside the lubrication component 4 is fixedly connected to a spray cylinder 21. A lower rod 25 is slidably connected inside the spray cylinder 21. An upper rod 24 is slidably connected to the end of the lower rod 25 away from the spray cylinder 21. A top ring 22 is fixedly connected to the end of the upper rod 24.

[0020] A pressing spring 23 is fixedly connected to the outer wall of the top ring 22. The end of the pressing spring 23 away from the top ring 22 is in contact with the outer wall of the lower rod 25. The nozzle 19 is connected to a nozzle 20 at one end outside the lubricating component 4. An upper nozzle 34 is provided on the nozzle 20.

[0021] In this embodiment, when using the oil seal press-fit limiting fixture, the operator first puts the collar 8 onto the fixture body 1, and the oil seal 9 inside the collar 8 is also initially positioned. Then, the fixture body 1 is inserted into the gear shaft 35. After the basic installation is completed, the operator turns the rocker arm 7 to the right. The rocker arm 7 drives the drive component 10 to rotate. The crank arm 11 fixed at the bottom of the drive component 10 rotates synchronously. The end of the crank arm 11 away from the drive component 10 pushes the lower push column 12 to slide downward along the inside of the fixture body 1. The wedge-shaped part 6 at the bottom of the lower push column 12 pushes multiple outer push blocks 2 toward the fixture body. 1. External movement, pressing against the inner wall of the gear shaft 35, thereby achieving a stable fixation of the tooling body 1 within the gear shaft 35 and preventing it from falling off on its own. Since gear shafts 35 are provided on both the upper and lower sides of the pallet to be processed, after the tooling body 1 is installed and fixed within one gear shaft 35, the operator can use an external machine to rotate the pallet 180 degrees, so that the gear shaft 35, which was originally facing upwards, turns downwards. At this time, since the oil seal 9 has been positioned within the gear shaft 35 through the tooling body 1, it will not fall off due to gravity. Then, repeat the above steps to complete the installation of the tooling body 1 on the other gear shaft 35.

[0022] The external pressing device is equipped with two sets of pressing heads, one upper and one lower. The upper pressing head is a movable structure. After the tooling body 1 is installed in both the upper and lower gear shafts 35, the lower pressing head is raised to the positioning position and kept fixed. When the upper pressing head is driven to move downward, it first contacts the lower pressing block 5 on the tooling body 1. Under the continuous pressing action, it drives the tray carrying the product to move downward synchronously until the lower pressing block 5 on the tooling body 1 at the bottom of the tray is completely in contact with the fixed lower pressing head. At this time, under the continuous pressing of the upper pressing head and the fixed cooperation of the lower pressing head, the upper and lower tooling bodies 1 are pressed at the same time, thereby pressing the matching oil seal 9 into the corresponding gear shaft 35.

[0023] Example 2: Please refer to Figure 1 - Figure 13The lubricating component 4 has an air storage chamber 13 and an oil storage chamber 14 fixedly connected inside. An air supply pipe 15 is connected inside the air storage chamber 13. An air jet pipe 38 is provided inside the nozzle 19. The end of the air supply pipe 15 away from the air storage chamber 13 is connected to the air jet pipe 38. A lower nozzle 37 is provided at the end of the air jet pipe 38.

[0024] A switch box 16 is provided on the gas pipe 15. A rotating shaft 17 is rotatably connected inside the switch box 16. Baffles 18 are provided on both sides of the rotating shaft 17. A gear 29 is fixedly connected to the end of the rotating shaft 17. A rack 30 is slidably connected to the back of the switch box 16. The rack 30 and the gear 29 are meshed. A return spring 31 is fixedly connected to the outer wall of the rack 30. A push plate 32 is rotatably connected to the end of the rack 30. A blocking member 33 is fixedly connected to the bottom of the push plate 32. The end of the blocking member 33 away from the push plate 32 is fixedly connected to the outer wall of the rack 30.

[0025] A mounting plate 26 is fixedly connected to the outer side wall of the top ring 22, and an outward pusher 27 is fixedly connected to the mounting plate 26. The end of the outward pusher 27 is provided with a bevel 28.

[0026] An oil supply pipe 36 is connected to the inside of the oil storage chamber 14, and the end of the oil supply pipe 36 away from the oil storage chamber 14 is connected to the inside of the nozzle 19.

[0027] The lubricating component 4 has a sliding connection to a lower pressure block 5, and one end of the lower pressure block 5 located inside the lubricating component 4 is in contact with the top ring 22.

[0028] In this embodiment, during the pressing process, the lower pressing block 5 first moves into the lubricating component 4, overcoming the elastic force of the pressing spring 23 and pushing the upper rod 24 to retract into the lower rod 25. The top ring 22 at the end of the upper rod 24 drives the mounting plate 26 to move synchronously towards the switch box 16. The external pusher 27 fixed on the mounting plate 26 moves synchronously. The inclined surface 28 at the end of the external pusher 27 contacts the push plate 32 on the back of the switch box 16 and pushes it to move. The push plate 32 drives the rack 30 to slide away from the external pusher 27, overcoming the elastic force of the return spring 31. The rack 30 and the switch box 16... The gears 29 on the 6 mesh with each other. When the rack 30 moves, it drives the gears 29 to rotate. The rotating shaft 17, which is fixed to the gears 29, rotates 90 degrees. The baffles 18 on both sides of the rotating shaft 17 change from the original state of vertically blocking the switch box 16 to the horizontal state. At this time, the high-pressure gas in the gas storage chamber 13 enters the rear section of the gas supply pipe 15 through the switch box 16. It is then transported to the jet pipe 38 through the gas supply pipe 15. Finally, the lower nozzle 37 at the end of the jet pipe 38 blows obliquely onto the surface of the oil seal 9, blowing away the impurities attached to the surface of the oil seal 9 and preventing impurities from causing wear on the surface of the oil seal 9 during the subsequent pressing process.

[0029] When the upper rod 24 is fully retracted into the lower rod 25, the top ring 22 contacts the end of the lower rod 25. Under the continuous pressure of the pressure head, the lower rod 25 is pushed into the spray nozzle 21. At this time, the push plate 32 contacts the end of the mounting plate 26 without the external pusher 27. After losing the thrust of the external pusher 27, the rack 30 drives the push plate 32 to return to its original position under the elastic force of the return spring 31. The gear 29 and the flip shaft 17 flip in opposite directions, and the baffle 18 returns to the vertical state to block the switch box 16. The high-pressure gas supply is interrupted, and the lower nozzle 37 stops blowing. During the process of the lower rod 25 being pushed into the spray nozzle 21, the lubricating oil stored in the spray nozzle 21 is squeezed into the spray pipe 19 and transported to the nozzle 20 through the spray pipe 19. The upper nozzle 34 of the nozzle 20 sprays obliquely onto the surface of the oil seal 9, providing lubrication guarantee for the subsequent pressing of the oil seal 9.

[0030] After the oil seal 9 is installed, the operator reverses the rocker arm 7, and the drive component 10 drives the crank arm 11 to rotate in the opposite direction. The lower push column 12 slides upward along the inside of the tooling body 1. Since the wedge 6 is connected to the outer push block 2 through the side groove, when the wedge 6 is driven to move upward, it will pull each outer push block 2 back into the tooling body 1 through the guiding action of the side groove. At this time, the tooling body 1 can be removed from the gear shaft 35. When the pressure head no longer presses the lower pressure block 5, the elastic force of the pressing spring 23 pushes the upper rod 24 and the lower rod 25 back to their original positions. The mounting plate 26 drives the outer push component 27 to reset. When the right angle at the end of the outer push component 27 contacts the push plate 32, it only pushes it to flip upward and will not drive the rack 30 to move. Therefore, the gear 29 and the flip shaft 17 will not rotate again. During the process of the lower rod 25 being pulled out of the spray nozzle 21 and reset, it will draw the lubricating oil in the oil storage chamber 14 through the oil supply pipe 36 to replenish the inside of the spray nozzle 21, preparing for the next use.

[0031] It should be noted that both the gas storage chamber 13 and the oil storage chamber 14 are equipped with replenishment ports to promptly replenish high-pressure gas and lubricating oil. Both the oil supply pipe 36 and the gas supply pipe 15 are equipped with one-way valves to effectively prevent fluid backflow. Both the upper nozzle 34 and the lower nozzle 37 are designed at an angle to ensure that the sprayed lubricating oil and high-pressure gas can fully cover the surface of the oil seal 9. This technical solution uses low-viscosity lubricating oil, which, combined with the smaller upper nozzle 34, can achieve uniform spraying under high pressure to ensure lubrication effect.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A limiting fixture for oil seal press fitting, comprising a fixture body (1), wherein a gear shaft (35) is engaged with the outer wall of the fixture body (1), characterized in that, A collar (8) is fitted onto the tooling body (1), and an oil seal (9) is provided inside the collar (8). A push column (12) is slidably connected inside the tooling body (1), and a tensioning mechanism is provided on the push column (12). The tensioning mechanism includes a wedge-shaped part (6) fixedly connected to the bottom of the push column (12). A drive component (10) is rotatably connected to the tooling body (1), and a crank arm (11) is fixedly connected to the bottom of the drive component (10). A rocker arm (7) is fixedly connected to the end of the component (10) away from the crank arm (11). The end of the crank arm (11) away from the drive component (10) is rotatably connected to the end of the push column (12). Multiple push blocks (2) are slidably connected inside the tooling body (1). Side grooves are provided on the push blocks (2). The wedge-shaped component (6) is slidably connected to the side grooves. A top cover (3) is fixedly connected to the outer wall of the tooling body (1). A lubrication mechanism is provided on the top cover (3).

2. The limiting fixture for oil seal press-fitting according to claim 1, characterized in that: The lubrication mechanism includes lubricating components (4) fixedly connected to both sides of the top cover (3). A nozzle (19) is provided through the interior of both sides of the lubricating components (4). A spray cylinder (21) is fixedly connected to one end of the nozzle (19) inside the lubricating component (4). A lower rod (25) is slidably connected inside the spray cylinder (21). An upper rod (24) is slidably connected to one end of the lower rod (25) away from the spray cylinder (21). A top ring (22) is fixedly connected to the end of the upper rod (24).

3. The limiting fixture for oil seal press-fitting according to claim 2, characterized in that: A pressing spring (23) is fixedly connected to the outer wall of the top ring (22). The end of the pressing spring (23) away from the top ring (22) is in contact with the outer wall of the lower rod (25). The nozzle (20) is connected to the end of the nozzle (19) outside the lubricating component (4). The nozzle (20) is provided with an upper nozzle (34).

4. The limiting fixture for oil seal press-fitting according to claim 2, characterized in that: The lubricating component (4) has an air storage chamber (13) and an oil storage chamber (14) fixedly connected inside. An air supply pipe (15) is connected inside the air storage chamber (13). An air jet pipe (38) is provided inside the nozzle (19). The end of the air supply pipe (15) away from the air storage chamber (13) is connected to the air jet pipe (38). A lower nozzle (37) is provided at the end of the air jet pipe (38).

5. The limiting fixture for oil seal press-fitting according to claim 4, characterized in that: A switch box (16) is provided on the gas pipe (15). A rotating shaft (17) is rotatably connected inside the switch box (16). Baffles (18) are provided on both sides of the rotating shaft (17). A gear (29) is fixedly connected to the end of the rotating shaft (17). A rack (30) is slidably connected to the back of the switch box (16). The rack (30) and the gear (29) are meshed. A return spring (31) is fixedly connected to the outer wall of the rack (30). A push plate (32) is rotatably connected to the end of the rack (30). A blocking member (33) is fixedly connected to the bottom of the push plate (32). The end of the blocking member (33) away from the push plate (32) is fixedly connected to the outer wall of the rack (30).

6. The limiting fixture for oil seal press-fitting according to claim 2, characterized in that: An installation plate (26) is fixedly connected to the outer side wall of the top ring (22), and an outward pusher (27) is fixedly connected to the installation plate (26). The end of the outward pusher (27) is provided with a bevel (28).

7. The limiting fixture for oil seal press-fitting according to claim 4, characterized in that: An oil delivery pipe (36) is provided inside the oil storage chamber (14), and one end of the oil delivery pipe (36) away from the oil storage chamber (14) is connected to the inside of the nozzle (19).

8. A limiting fixture for oil seal press-fitting according to claim 2, characterized in that: The lubricating component (4) has a sliding connection to a lower pressure block (5), and one end of the lower pressure block (5) located inside the lubricating component (4) is in contact with the top ring (22).

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