Heavy truck release bearing unit with anti-skid structure and its production process

Abstract

The present invention relates to a heavy truck separation bearing unit with an anti-skid structure and its production process, belonging to the technical field of bearing units, including an inner ring, the inner ring end face is provided with a center sleeve, the center sleeve is provided with a U-shaped slot integrated with the center sleeve, the outer periphery of the inner ring is provided with an outer cover that is inserted and sleeved with the U-shaped slot, an outer ring that is nested and connected with the outer cover is provided between the outer cover and the inner ring, a retaining frame is provided between the outer ring and the inner ring, and a plurality of steel balls that are distributed in an annular manner with equal spacing and are nested and connected with the retaining frame are provided in the retaining frame. It has the characteristics of compact structure, high load-bearing capacity, good wear resistance, good running stability and long service life. It plays a great role in meeting axial loads and preventing circumferential slippage.

Description

Technical Field

[0001] The invention relates to the technical field of bearing units, and in particular to a heavy truck release bearing unit with an anti-slip structure and a production process thereof. Background Art

[0002] The heavy truck release bearing unit has a large working load, high temperature, harsh environment, and is not fixed during operation. The shortcomings of existing products are as follows:

[0003] 1) The connection between parts is unreliable, the product is prone to loosening, wears out quickly during use, and has a short lifespan;

[0004] 2) The internal space of the bearing is small, the design load capacity is low, and the life is short;

[0005] 3) Without relevant measuring equipment, product design performance cannot be accurately verified. Summary of the invention

[0006] The present invention mainly solves the problems of low load-bearing capacity, rapid wear, poor running stability and short service life in the prior art, and provides a heavy truck release bearing unit with anti-skid structure and its production process, which has the characteristics of compact structure, high load-bearing capacity, good wear resistance, good running stability and long service life. It plays a great role in meeting axial load and preventing circumferential slip.

[0007] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0008] A heavy-duty truck separation bearing unit with an anti-skid structure comprises an inner ring, a center sleeve is provided on the end face of the inner ring, a U-shaped groove which is integrated with the center sleeve is provided on the center sleeve, an outer cover which is embedded and sleeved with the U-shaped groove is provided on the periphery of the inner ring, an outer ring which is nested and connected with the outer cover is provided between the outer cover and the inner ring, a retaining frame is provided between the outer ring and the inner ring, and a plurality of steel balls which are distributed in an annular shape with equal intervals and are nested and connected with the retaining frame are provided in the retaining frame.

[0009] Preferably, the end surface of the outer cover is provided with a plurality of layers of wave springs which are nested and connected with the inner ring in a slot-like manner.

[0010] Preferably, a spline inner sleeve is provided in the center sleeve and is fixedly connected to the center sleeve in an inserting manner.

[0011] Preferably, a spring washer is provided between the outer ring and the center sleeve.

[0012] Preferably, both ends of the retaining frame are provided with a multi-lip skeleton sealing ring which is nested, connected and fixed with the inner wall of the outer ring.

[0013] Preferably, the U-shaped slot is provided with a riveting notch for riveting and crimping with the outer cover.

[0014] Preferably, the production process of the heavy truck release bearing unit with an anti-slip structure comprises the following steps:

[0015] Step 1: When processing the center sleeve, collect the SPCC material, use a micrometer to confirm the thickness of the material, ensure that the thickness reaches 2.26mm~2.3mm, and check whether the material has cracks and rust defects, and pull the material to the punch feeding area. SPCC was originally the name of the steel material of the Japanese standard (JIS) "general cold-rolled carbon steel sheet and strip". Many countries or companies directly use it to indicate the same type of steel they produce, such as Baosteel Q / BQB402 standard has SPCC. Its chemical composition and mechanical properties are equivalent to Chinese grades Q195 and Q215A.

[0016] Step 2: Adjust the punch die. First, take out the blanking die corresponding to the model, select a 50T ordinary punch press, and use high-pressure gas to blow away foreign matter on the punch press work surface; use bolts to fix the upper die in the middle of the upper work surface of the punch press, place the lower die on the lower work surface of the punch press, adjust the punch slide to make the upper and lower dies fully contact, and then use the pressing plate to fix the lower die on the lower work surface of the punch press, manually adjust the punch press to make the upper work surface of the punch press slide up and down, and observe whether the upper and lower dies fit smoothly.

[0017] Step 3: Take out the forming die corresponding to the model, select an ordinary punch press of 100-200T, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the upper die in the middle of the upper work surface of the punch press, place the lower die on the lower work surface of the punch press, adjust the slider of the punch press to make the upper and lower dies fit completely, then use the pressing plate to fix the lower die on the lower work surface of the punch press, and then manually adjust the punch press to make the work surface on the punch press slide up and down, so that the upper and lower dies can slide smoothly.

[0018] Step 4: Carry out turning, positioning with inner hole, turning end face and inner chamfer.

[0019] Step 5: Take out the lathe fixture corresponding to the model, select the CNC lathe, use high-pressure gas to blow away foreign matter on the lathe worktable; fix the inner hole of the blank in the middle of the lathe fixture. There is no gap between the inner end face of the blank and the fixture, adjust the oil pressure to 4-6MPa, try to tighten and select the required tool, call out the processing program of the corresponding model, zero reference; close the safety door, conduct a test run, and conduct production processing after the sample is qualified.

[0020] Step 6: When milling the groove, take out the milling machine fixture corresponding to the model, select the corresponding milling machine, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the fixture in the middle of the work surface of the milling machine, install the machined product on the milling machine fixture, manually adjust the positioning block so that the product is located on the center line of the work table, select a suitable milling cutter, adjust the milling cutter processing position, adjust the milling end position, and start the milling process on the milling machine.

[0021] Step 7: When milling the two ears, take out the milling machine fixture corresponding to the model, select the corresponding milling machine, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the fixture in the middle of the work surface of the milling machine, install the machined product on the milling machine fixture, manually adjust the positioning block to make the product located on the center line of the work table, ensure that the center line and the center line of the fixture coincide, use the pressure plate to press the product, select a suitable disc milling cutter with a diameter of more than 50 mm, adjust the milling cutter processing position, ensure that the symmetry of the two ears is within 0.2 mm, adjust the milling end position, and start the milling process on the milling machine.

[0022] Step 8: When quenching the two ears, select the corresponding high-frequency machine, take out the induction coil and fixture corresponding to the model, install the fixture and induction coil, use high-pressure gas to blow away foreign matter on the fixture surface, fix the induction coil, adjust the product to be located in the middle of the induction coils on both sides, adjust the coil position, make the gap between the coil and the center sleeve ear between 1 and 2 mm, and the same on both sides; adjust the induction current and time according to the process documents, test processing, ensure that the product hardened layer is ≥1.5mm; hardness is ≥50HRC, and after the test processing is qualified, start the equipment for batch processing.

[0023] Step 9: Assemble, take out various parts from the warehouse, remove the outer packaging of steel balls, outer covers and center sleeves, and clean them with 120# gasoline or cleaning agent; note that steel balls of different specifications must be cleaned separately and cannot be mixed; cleaning needs to be used within 2 working days before use, otherwise it is necessary to do rust prevention and clean again before use.

[0024] a. According to the size of the inner ring, outer ring and steel ball, select the appropriate inner ring and outer ring to assemble the steel balls. There are 12 steel balls to make the clearance meet the requirements.

[0025] b. Use a copper pin to evenly push the steel balls between the inner and outer rings apart, insert a retainer, then insert the stamping die, and install the retainer on the other side so that the rivets and holes correspond one to one.

[0026] c. Adjust the oil pressure of the hydraulic press to 80MPa, place the mold into the pressure zone of the hydraulic press, start the hydraulic press, and apply pressure to the rivets of the cage so that the rivets can completely rivet the cage.

[0027] d. Move the product parts to the greasing area and install the multi-lip skeleton seal on one side.

[0028] e. Select the oil head corresponding to the product. Note that the grease grade inside the oil head must be consistent with the grease grade in the grease pump. If they are consistent, remove the grease in the oil head, then adjust the air pressure of the grease pump to make the air pressure between 0.2 and 0.4 MPa, continuously adjust the positioning nut of the grease pump, try to inject grease, so that the grease output reaches 8 to 10 g at a time, and finally tighten the positioning nut; if the grease grade in the oil head is inconsistent with the grease grade in the grease pump, production cannot be carried out before the grease in the oil head is removed; press the foot pedal once to inject grease once; when injecting grease, insert the product completely into the oil head, then press the foot pedal once, and after the air pressure sound stops, rotate the bearing by hand for more than 0.5 turns, and then pull out the bearing. Only in this way can one grease injection be completed.

[0029] f. Install the multi-lip skeleton seal on the other side.

[0030] g. Use a no-go gauge to conduct 100% inner diameter inspection on the center sleeves received. Unqualified products will be discarded and qualified products will be transferred to the next process.

[0031] h. Move the qualified center sleeve, outer cover and bearing parts into the curling area; adjust the curling machine and adjust the working pressure to 3-5MPa; take out the corresponding curling mold, first put the outer cover into the curling mold, put the bearing into the outer cover, and then put the wave spring and center sleeve in order; press the switch, first press the center sleeve and outer cover together, and then push the roller to squeeze the outer cover into the groove of the center sleeve.

[0032] i. Pull the rolled product into the riveting area, take out the corresponding riveting tooling, and adjust the oil pressure to 50-80MPa; adjust the working position of the hydraulic press head, put the product to be riveted into the tooling, push it into the hydraulic working area, turn on the equipment switch, and the hydraulic press head moves downward to rivet the outer cover and the center sleeve gap.

[0033] j. Move the riveted product to the centering force testing area, replace the test mandrel of the centering force tester with the mandrel corresponding to the product; put the inner hole of the product to be tested into the mandrel; adjust the dynamometer on the tester and return it to zero; turn the measuring wrench of the tester to make the measuring head of the dynamometer point to the product, slowly turn the wrench to change the pointer of the dynamometer, and continue to turn the wrench until the pointer of the dynamometer no longer increases. Note the reading of the dynamometer pointer, which is the centering force of the product measured this time, and then turn the wrench back; rotate the product on the mandrel about 120°; repeat the above steps and measure the centering force of the product again; finally, rotate the product about 120° twice, repeat the above steps, and measure the centering force four times; usually the centering force value measured for the first time is not included, and the average value of the last three measurements is the centering force of the product being tested.

[0034] k. Place the qualified product on the workbench, take out the appropriate spring pressing die, place the product with the inner ring facing upwards, take out the three-layer wave spring and place it in the mouth of the inner ring. Place the pressing die on the three-layer wave spring and place it in the working area of ​​the air press. Adjust the air pressure of the air press to 0.4-0.6MPa, start the press, and press the three-layer wave spring (2) into the inner ring groove without rebounding.

[0035] As a preferred method, take out a piece of material and transport it between the dies for a test punch. Adjust the slider on the punch press so that the upper die can punch into the lower die by more than 0.5 mm. Check the appearance of the punch material to confirm that the die is installed correctly and there are no burrs on the edge of the blanking material. Then use screws to lock the slider of the punch press. Then use high-pressure gas to blow clean the working platform and the surface of the die. Use a brush to apply a small amount of lubricating oil on the surface of the die. Place a receiving basket in the blanking area of ​​the punch press, turn on the power, adjust the pedal height, make the foot position ergonomic, and complete the molding production process.

[0036] Preferably, move the blanking basket to the waiting area, take out the blanking material, and put it into the lower die of the mold. The edge of the material is completely consistent with the concave area of ​​the lower die of the mold and cannot exceed it. Then adjust the slider on the punch so that the upper die can punch into the lower die more than 1.0 mm, and check the appearance of the test punch to confirm that the mold is installed correctly and there are no burrs on the edge of the product. Then use the screw to lock the punch slider, and then use high-pressure gas to blow clean the working platform and the mold surface, apply a small amount of lubricating oil on the edge of the mold with a brush, place the receiving basket in the blanking area of ​​the punch, turn on the power, and adjust the pedal height to make the foot position ergonomic.

[0037] Preferably, after quenching the two ears, select the corresponding grinder to grind the two ears, take out the fixture corresponding to the model, install the fixture, and use high-pressure gas to blow away foreign matter on the fixture surface; fix the product, adjust the grinding wheel position of the grinder, adjust the feed speed and grinding wheel speed of the grinder, and ensure that the height difference between the ears on both sides is ≤0.1mm.

[0038] The present invention can achieve the following effects:

[0039] The present invention provides a heavy truck release bearing unit with an anti-skid structure and a production process thereof, which, compared with the prior art, has the characteristics of compact structure, high load-bearing capacity, good wear resistance, good running stability and long service life, and plays a great role in meeting axial load and preventing circumferential slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of the present invention.

[0041] Figure 2 It is a front view structural schematic diagram of the present invention.

[0042] In the figure: inner ring 1, wave spring 2, outer cover 3, spline inner sleeve 4, center sleeve 5, multi-lip skeleton seal ring 6, U-shaped groove 7, spring washer 8, retaining frame 9, steel ball 10, outer ring 11, riveted notch 12. DETAILED DESCRIPTION

[0043] The technical solution of the invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0044] Example: Figure 1 and Figure 2 As shown, a heavy truck separation bearing unit with an anti-skid structure includes an inner ring 1, a center sleeve 5 is provided on the end face of the inner ring 1, and a spline inner shaft sleeve 4 is provided in the center sleeve 5 and is fixedly connected with the center sleeve 5 by a snap-fitting sleeve. The center sleeve 5 is provided with a U-shaped slot 7 which is integrated with the center sleeve 5, and the U-shaped slot 7 is provided with a riveting notch 12 which is riveted and crimped with the outer cover 3. An outer cover 3 which is snap-fitted with the U-shaped slot 7 is provided on the periphery of the inner ring 1, and three layers of wave springs 2 which are connected by a snap-fitting slot are provided on the end face of the outer cover 3. An outer ring 11 which is connected by a snap-fitting slot is provided between the outer cover 3 and the inner ring 1, and a spring washer 8 is provided between the outer ring 11 and the center sleeve 5. A retainer 9 is provided between the outer ring 11 and the inner ring 1, and 12 steel balls 10 which are distributed in an annular manner with equal intervals and are connected by a snap-fitting sleeve are provided in the retainer 9. Both ends of the retainer 9 are provided with a multi-lip skeleton sealing ring 6 which is connected by a snap-fitting slot and is fixed with the inner wall of the outer ring 11.

[0045] The production process of the heavy truck release bearing unit with anti-skid structure includes the following steps:

[0046] Step 1: When processing the center sleeve 5, pick up the SPCC material, use a micrometer to confirm the thickness of the material, ensure that the thickness reaches 2.3mm, and check whether the material has cracks and rust defects, and pull the material to the feeding area of ​​the punch press.

[0047] Step 2: Adjust the punch die. First, take out the blanking die corresponding to the model, select a 50T ordinary punch press, and use high-pressure gas to blow away foreign matter on the punch press work surface; use bolts to fix the upper die in the middle of the upper work surface of the punch press, place the lower die on the lower work surface of the punch press, adjust the punch slide to make the upper and lower dies fully contact, and then use the pressing plate to fix the lower die on the lower work surface of the punch press, manually adjust the punch press to make the upper work surface of the punch press slide up and down, and observe whether the upper and lower dies fit smoothly.

[0048] Take out a piece of material and transport it between the dies for a test punch. Adjust the slider on the punch press so that the upper die can punch into the lower die by more than 0.5mm. Check the appearance of the punch to confirm that the die is installed correctly and there are no burrs on the edge of the blanking material. Then use the screws to lock the slider of the punch press. Then use high-pressure gas to blow clean the working platform and the surface of the die. Use a brush to apply a small amount of lubricating oil on the surface of the die. Place a receiving basket in the blanking area of ​​the punch press, turn on the power, adjust the pedal height, make the foot position ergonomic, and complete the molding production process.

[0049] Step 3: Take out the forming die corresponding to the model, select an ordinary punch press of 100-200T, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the upper die in the middle of the upper work surface of the punch press, place the lower die on the lower work surface of the punch press, adjust the slider of the punch press to make the upper and lower dies fit completely, then use the pressing plate to fix the lower die on the lower work surface of the punch press, and then manually adjust the punch press to make the work surface on the punch press slide up and down, so that the upper and lower dies can slide smoothly.

[0050] Move the blanking basket to the waiting area, take out the blanking material, and put it into the lower die of the mold. The edge of the material and the concave area of ​​the lower die of the mold are completely consistent and cannot exceed. Then adjust the slider on the punch press so that the upper die can punch into the lower die more than 1.0 mm, and check the appearance of the test punch material to confirm that the mold is installed correctly and there are no burrs on the edge of the product. Then use the screw to lock the punch press slider, and then use high-pressure gas to blow clean the working platform and the mold surface, use a brush to apply a small amount of lubricating oil on the edge of the mold, place the receiving basket in the blanking area of ​​the punch press, turn on the power, and adjust the pedal height to make the foot position ergonomic.

[0051] Step 4: Carry out turning, positioning with inner hole, turning end face and inner chamfer.

[0052] Step 5: Take out the lathe fixture corresponding to the model, select the CNC lathe, use high-pressure gas to blow away foreign matter on the lathe worktable; fix the inner hole of the blank in the middle of the lathe fixture. There is no gap between the inner end face of the blank and the fixture, adjust the oil pressure to 4-6MPa, try to tighten and select the required tool, call out the processing program of the corresponding model, zero reference; close the safety door, conduct a test run, and conduct production processing after the sample is qualified.

[0053] Step 6: When milling the groove, take out the milling machine fixture corresponding to the model, select the corresponding milling machine, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the fixture in the middle of the work surface of the milling machine, install the machined product on the milling machine fixture, manually adjust the positioning block so that the product is located on the center line of the work table, select a suitable milling cutter, adjust the milling cutter processing position, adjust the milling end position, and start the milling process on the milling machine.

[0054] Step 7: When milling the two ears, take out the milling machine fixture corresponding to the model, select the corresponding milling machine, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the fixture in the middle of the work surface of the milling machine, install the machined product on the milling machine fixture, manually adjust the positioning block to make the product located on the center line of the work table, ensure that the center line and the center line of the fixture coincide, use the pressure plate to press the product, select a suitable disc milling cutter with a diameter of more than 50 mm, adjust the milling cutter processing position, ensure that the symmetry of the two ears is within 0.2 mm, adjust the milling end position, and start the milling process on the milling machine.

[0055] Step 8: When quenching the two ears, select the corresponding high-frequency machine, take out the induction coil and fixture corresponding to the model, install the fixture and induction coil, use high-pressure gas to blow away foreign matter on the fixture surface, fix the induction coil, adjust the product to be located in the middle of the induction coils on both sides, adjust the coil position, make the gap between the coil and the center sleeve ear between 1 and 2 mm, and the same on both sides; adjust the induction current and time according to the process documents, test processing, ensure that the product hardened layer is ≥1.5mm; hardness is ≥50HRC, and after the test processing is qualified, start the equipment for batch processing.

[0056] After completing the quenching of the two ears, select the corresponding grinder to grind the two ears, take out the fixture corresponding to the model, install the fixture, and use high-pressure gas to blow away foreign matter on the fixture surface; fix the product, adjust the grinding wheel position of the grinder, adjust the feed speed and grinding wheel speed of the grinder, and ensure that the height difference of the ears on both sides is ≤0.1mm.

[0057] Step 9: Assemble, take out various parts from the warehouse, remove the outer packaging of steel ball 10, outer cover 3 and center sleeve 5, and clean them with 120# gasoline or cleaning agent; note that steel balls of different specifications must be cleaned separately and cannot be mixed; cleaning needs to be used within 2 working days before use, otherwise it is necessary to do rust prevention and clean again before use.

[0058] a. According to the size of inner ring 1, outer ring 11 and steel ball 10, select appropriate inner ring 1 and outer ring 11 to assemble steel ball 10. There are 12 steel balls 10 so that the clearance meets the requirements.

[0059] b. Use a copper pin to evenly push the steel ball 10 between the inner ring 1 and the outer ring 11, insert a retainer 9, then insert the stamping die, and install the retainer 9 on the other side so that the rivets and holes correspond one to one.

[0060] c. Adjust the oil pressure of the hydraulic press to 80 MPa, place the mold into the pressure zone of the hydraulic press, start the hydraulic press, and apply pressure to the rivets of the retainer 9 so that the rivets can completely rivet the retainer 9.

[0061] d. Move the product parts to the greasing area and install the multi-lip skeleton seal ring 9 on one side.

[0062] e. Select the oil head corresponding to the product. Note that the grease grade inside the oil head must be consistent with the grease grade in the grease pump. If they are consistent, remove the grease in the oil head, then adjust the air pressure of the grease pump to 0.3MPa, continuously adjust the positioning nut of the grease pump, try to inject grease, so that the grease output reaches 9g at a time, and finally tighten the positioning nut. If the grease grade in the oil head is inconsistent with the grease grade in the grease pump, production cannot be carried out before the grease in the oil head is removed. Press the foot pedal once to inject grease once. When injecting grease, insert the product completely into the oil head, then press the foot pedal once, and after the air pressure sound stops, rotate the bearing by hand for more than 0.5 turns, and then pull out the bearing. Only in this way can the grease be injected once.

[0063] f. Install the multi-lip skeleton seal ring 9 on the other side.

[0064] g. Use a go-through gauge to conduct 100% inner diameter inspection on the center sleeve 5. Unqualified products will be discarded and qualified products will be transferred to the next process.

[0065] h. Move the qualified center sleeve 5, outer cover 3 and bearing parts into the curling area; adjust the curling machine and adjust the working pressure to 4MPa; take out the corresponding curling mold, first put the outer cover 3 into the curling mold, put the bearing into the outer cover 3, and then put the wave spring 2 and center sleeve 5 in order; press the switch, first press the center sleeve 5 and the outer cover 3 together, and then push the roller to squeeze the outer cover 3 into the groove of the center sleeve 5.

[0066] i. Pull the rolled product into the riveting area, take out the corresponding riveting tooling, and adjust the oil pressure to 70MPa; adjust the working position of the hydraulic press head, put the product to be riveted into the tooling, push it into the hydraulic working area, turn on the equipment switch, and the hydraulic press head moves downward to rivet the notches of the outer cover 3 and the center sleeve 5.

[0067] j. Move the riveted product to the centering force testing area, replace the test mandrel of the centering force tester with the mandrel corresponding to the product; put the inner hole of the product to be tested into the mandrel; adjust the dynamometer on the tester and return it to zero; turn the measuring wrench of the tester to make the measuring head of the dynamometer point to the product, slowly turn the wrench to change the pointer of the dynamometer, and continue to turn the wrench until the pointer of the dynamometer no longer increases. Note the reading of the dynamometer pointer, which is the centering force of the product measured this time, and then turn the wrench back; rotate the product on the mandrel about 120°; repeat the above steps and measure the centering force of the product again; finally, rotate the product about 120° twice, repeat the above steps, and measure the centering force four times; usually the centering force value measured for the first time is not included, and the average value of the last three measurements is the centering force of the product being tested.

[0068] k. Place the qualified products on the workbench, take out the appropriate spring pressing die, place the product with the inner ring facing upwards, take out the three-layer wave spring 2 and put it into the mouth of the inner ring 1, place the pressing die on the three-layer wave spring 2 and put it into the working area of ​​the air press, adjust the air pressure of the air press to 0.5MPa, start the press, so that the three-layer wave spring 2 is pressed into the groove of the inner ring 1 and cannot bounce out.

[0069] In summary, the heavy truck release bearing unit with anti-skid structure and its production process have the characteristics of compact structure, high load-bearing capacity, good wear resistance, good running stability and long service life. It plays a great role in meeting axial load and preventing circumferential slip.

[0070] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A production process for a heavy truck release bearing unit with an anti-slip structure, characterized in that: The heavy truck separation bearing unit with an anti-slip structure comprises an inner ring (1), a center sleeve (5) is provided on the end face of the inner ring (1), a spline inner shaft sleeve (4) is provided in the center sleeve (5) and is fixedly connected to the center sleeve (5) in an embedded manner, the center sleeve (5) is provided with a U-shaped groove (7) which is integrated with the center sleeve (5), the outer periphery of the inner ring (1) is provided with an outer cover (3) which is embeddedly connected to the U-shaped groove (7), the U-shaped groove (7) is provided with a spline inner shaft sleeve (4) which is fixedly connected to the center sleeve (5) in an embedded manner, The outer cover (3) is provided with a riveted notch (12) riveted and crimped with the outer cover (3), the end surface of the outer cover (3) is provided with a plurality of layers of wave springs (2) connected to the inner ring (1) in a slot-like manner, an outer ring (11) connected to the outer cover (3) is provided between the outer cover (3) and the inner ring (1), a retaining frame (9) is provided between the outer ring (11) and the inner ring (1), and a plurality of steel balls (10) are provided in the retaining frame (9) and are distributed in an annular manner with equal intervals and are connected to the retaining frame (9) in a nested manner; The production process of the heavy truck release bearing unit includes the following steps: Step 1: When processing the center sleeve (5), collect the SPCC material, use a micrometer to confirm the thickness of the material, ensure that the thickness reaches 2.26mm~2.3mm, and check whether the material has cracks and rust defects, and pull the material to the punch feeding area; Step 2: Adjust the punching die. First, take out the blanking die corresponding to the model, select a 50T ordinary punching machine, and use high-pressure gas to blow away foreign matter on the punching machine's work surface. Use bolts to fix the upper die in the middle of the punching machine's upper work surface, place the lower die on the punching machine's lower work surface, adjust the punching machine's slider to make the upper and lower dies fully contact, and then use the pressing plate to fix the lower die on the punching machine's lower work surface. Manually adjust the punching machine to make the punching machine's work surface slide up and down, and observe whether the upper and lower dies fit smoothly. Step 3: Take out the forming die corresponding to the model, select a 100-200T ordinary punch press, and use high-pressure gas to blow away foreign matter on the punch press work surface; use bolts to fix the upper die in the middle of the upper work surface of the punch press, place the lower die on the lower work surface of the punch press, adjust the punch press slider to make the upper and lower dies fit completely, then use the pressing plate to fix the lower die on the lower work surface of the punch press, and then manually adjust the punch press to make the work surface on the punch press slide up and down, so that the upper and lower dies can slide smoothly; Step 4: Carry out turning, locate the inner hole, turn the end face and inner chamfer; Step 5: Take out the lathe fixture corresponding to the model, select the CNC lathe, use high-pressure gas to blow away the foreign matter on the lathe worktable; fix the inner hole of the blank in the middle of the lathe fixture; there is no gap between the inner end face of the blank and the fixture, adjust the oil pressure to 4-6MPa, try to tighten and select the required tool, call out the processing program of the corresponding model, and zero the reference; close the safety door, conduct a test run, and carry out production processing after the sample is qualified; Step 6: When milling the groove, take out the milling machine fixture corresponding to the model, select the corresponding milling machine, and use high-pressure gas to blow away foreign matter on the punching machine work surface; use bolts to fix the fixture in the middle of the milling machine work surface, install the machined product on the milling machine fixture, manually adjust the positioning block so that the product is located on the center line of the work table, select a suitable milling cutter, adjust the milling cutter processing position, adjust the milling end position, and start the milling process on the milling machine; Step 7: When milling the two ears, take out the milling machine fixture corresponding to the model, select the corresponding milling machine, and use high-pressure gas to blow away foreign matter on the work surface of the punch press; use bolts to fix the fixture in the middle of the work surface of the milling machine, install the machined product on the milling machine fixture, manually adjust the positioning block to make the product located on the center line of the work table, ensure that the center line and the center line of the fixture coincide, use the pressing plate to press the product, select a suitable disc milling cutter of more than φ50mm, adjust the milling cutter processing position, ensure that the symmetry of the two ears is within 0.2mm, adjust the milling end position, and start the milling process of the milling machine; Step 8: When quenching the two ears, select the corresponding high-frequency machine, take out the induction coil and fixture corresponding to the model, install the fixture and induction coil, use high-pressure gas to blow away foreign matter on the fixture surface, fix the induction coil, adjust the product to be located in the middle of the induction coils on both sides, adjust the coil position, make the gap between the coil and the center sleeve ear between 1 and 2 mm, and the same on both sides; adjust the induction current and time according to the process documents, test processing, ensure that the product hardened layer is ≥1.5mm; hardness is ≥50HRC, and start the equipment for batch processing after the test processing is qualified; Step 9: Assemble, take out the various parts from the warehouse, remove the outer packaging of the steel ball (10), the outer cover (3) and the center sleeve (5), and clean them with 120# gasoline or cleaning agent; a. According to the sizes of the inner ring (1), the outer ring (11) and the steel balls (10), select appropriate inner rings (1) and outer rings (11) to assemble the steel balls (10). There are 12 steel balls (10) to ensure that the clearance meets the requirements. b. Use a copper pin to evenly push the steel ball (10) between the inner ring (1) and the outer ring (11), insert a retainer (9), then insert the stamping die, and install the retainer (9) on the other side so that the rivets and holes correspond to each other. c. Adjust the oil pressure of the hydraulic press to 80 MPa, place the mold into the pressure zone of the hydraulic press, start the hydraulic press, and apply pressure to the rivets of the retainer (9) so that the rivets can completely rivet the retainer (9); d. Move the product parts to the greasing area and install the multi-lip skeleton seal ring (6) on one side; e. Select the oil head corresponding to the product. Note that the grease grade inside the oil head should be consistent with the grease grade in the grease pump. If they are consistent, remove the grease in the oil head, then adjust the air pressure of the grease pump to make the air pressure between 0.2 and 0.4 MPa, continuously adjust the positioning nut of the grease pump, try to inject grease, so that the grease output reaches 8 to 10 g at a time, and finally tighten the positioning nut; if the grease grade in the oil head is inconsistent with the grease grade in the grease pump, production cannot be carried out before the grease in the oil head is removed; press the foot pedal once to inject grease once; when injecting grease, fully insert the product into the oil head, then press the foot pedal once, wait for the air pressure sound to stop, rotate the bearing by hand for more than 0.5 circles, and then pull out the bearing, so that one-time grease injection is considered complete; f. Install the multi-lip skeleton seal ring (6) on the other side; g. Use a go-through gauge to inspect the inner diameter of the center sleeve (5) 100%. Unqualified products will be discarded, and qualified products will be transferred to the next process; h. Move the qualified center sleeve (5), outer cover (3) and bearing parts into the curling area; adjust the curling machine to adjust the working pressure to 3-5 MPa; take out the corresponding curling die, first put the outer cover (3) into the curling die, put the bearing into the outer cover (3), and then put the wave spring (2) and the center sleeve (5) in order; press the switch, first press the center sleeve (5) and the outer cover (3) together, and then push the roller to squeeze the outer cover (3) into the groove of the center sleeve (5); i. Pull the rolled product into the riveting area, take out the corresponding riveting tooling, and adjust the oil pressure to 50-80 MPa; adjust the working position of the hydraulic press head, put the product to be riveted into the tooling, push it into the hydraulic working area, turn on the equipment switch, and the hydraulic press head moves downward to rivet the notches of the outer cover (3) and the center sleeve (5); j. Move the riveted product to the centering force testing area, replace the test mandrel of the centering force tester with the mandrel corresponding to the product; put the inner hole of the product to be tested into the mandrel; adjust the dynamometer on the tester and return it to zero; turn the measuring wrench of the tester to make the measuring head of the dynamometer point to the product, slowly turn the wrench to change the pointer of the dynamometer, and continue to turn the wrench until the pointer of the dynamometer no longer increases. Note the reading of the dynamometer pointer as the centering force of the product being tested, and then turn the wrench back; rotate the product on the mandrel about 120°; repeat the above steps and measure the centering force of the product again; finally, rotate the product about 120° twice, repeat the above steps, and measure the centering force four times; the centering force value of the first measurement is not included, and the average value of the last three measurements is the centering force of the product being tested; k. Place the qualified product on the workbench, take out the appropriate spring pressing die, place the product with the inner ring facing upward, take out the three-layer wave spring (2) and place it on the mouth of the inner ring (1), place the pressing die on the three-layer wave spring (2) and place it in the working area of ​​the air press, adjust the air pressure of the air press to 0.4-0.6MPa, start the pressing, and press the three-layer wave spring (2) into the groove of the inner ring (1) without rebounding.

2. The production process of the heavy truck release bearing unit with anti-slip structure according to claim 1, characterized in that: A spring washer (8) is provided between the outer ring (11) and the center sleeve (5).

3. The production process of the heavy truck release bearing unit with anti-slip structure according to claim 1, characterized in that: Both ends of the retaining frame (9) are provided with a multi-lip skeleton sealing ring (6) which is nested, connected and fixed to the inner wall of the outer ring (11).

4. The production process of the heavy truck release bearing unit with anti-slip structure according to claim 1, characterized in that: Take out a piece of material and transport it between the molds for a test punch. Adjust the slider on the punch press so that the upper mold can punch into the lower mold more than 0.5mm. Check the appearance of the punch to confirm that the mold is installed correctly and there are no burrs on the edge of the blanking material. Then use screws to lock the punch press slider. Then use high-pressure gas to blow clean the working platform and the mold surface. Use a brush to apply a small amount of lubricating oil on the mold surface. Place a receiving basket in the blanking area of ​​the punch press, turn on the power, adjust the pedal height, make the foot position ergonomic, and complete the molding production process.

5. The production process of a heavy truck release bearing unit with an anti-slip structure according to claim 1, characterized in that: Move the blanking basket to the waiting area, take out the blanking material, and put it into the lower die of the mold. The edge of the material and the concave area of ​​the lower die of the mold are completely consistent and cannot exceed. Then adjust the slider on the punch press so that the upper die can punch into the lower die more than 1.0 mm, and check the appearance of the test punch material to confirm that the mold is installed correctly and there are no burrs on the edge of the product. Then use the screw to lock the punch press slider, and then use high-pressure gas to blow clean the working platform and the mold surface, use a brush to apply a small amount of lubricating oil on the edge of the mold, place the receiving basket in the blanking area of ​​the punch press, turn on the power, and adjust the pedal height to make the foot position ergonomic.

6. The production process of a heavy truck release bearing unit with an anti-slip structure according to claim 1, characterized in that: After completing the quenching of the two ears, select the corresponding grinder to grind the two ears, take out the fixture corresponding to the model, install the fixture, and use high-pressure gas to blow away foreign matter on the fixture surface; fix the product, adjust the grinding wheel position of the grinder, adjust the feed speed and grinding wheel speed of the grinder, and ensure that the height difference of the ears on both sides is ≤0.1mm.

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