Crankshaft flange center hole needle bearing dismounting device

Abstract

The utility model discloses a crankshaft flange center hole needle bearing dismounting device and belongs to the field of mechanical maintenance tools. The device comprises a puller body, a screw and a sleeve, one end of the puller body is provided with a puller tensioning head, an annular boss and a depth limiting block, and the other end of the puller body is provided with a holding end. The screw rod is arranged in the puller body in a penetrating mode, an inverted-cone-shaped screw rod head at the front end of the screw rod supports the puller tensioning head, and a handle nut and a tensioning head adjusting and controlling nut are arranged at the rear end of the screw rod. The sleeve is adopted to ensure that the axial lead of the needle bearing is consistent with the axial lead of the tool in the dismounting process, and the precision is controlled; the depth limiting block acts with the shell of the needle bearing to be disassembled, and the insertion depth of the puller tensioning head is guaranteed. According to the device, the handle nut is rotated to act with the base end of the sleeve, then the puller body and the screw pull out the needle bearing to be disassembled together, in the process, the thread rotating motion is converted into axial linear motion, and force needed in the disassembling process is greatly reduced; the labor intensity is reduced, and the working comfort and safety are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical maintenance tool field, concretely is a kind of crankshaft flange center hole needle roller bearing dismounting device. BACKGROUND

[0002] The needle roller bearing in the center hole of the crankshaft flange of the engine serves as a guide bearing and plays a key role in supporting the front end of the input shaft of the transmission. This bearing replaces sliding friction with low-friction rolling contact, which not only ensures high-precision coaxiality of the crankshaft and the center line of the input shaft of the transmission, but also significantly reduces wear, noise and vibration during operation, which is of great significance to improving power transmission efficiency, prolonging the service life of key components and improving the comfort performance of the vehicle. During engine maintenance and analysis, the dismounting of the needle roller bearing is a common and important task. However, the existing dismounting aids have many technical defects. The traditional drawbar tool is made of a single material and uses a direct pulling method, which is prone to deformation or breakage of the drawbar due to material fatigue after long-term high-frequency use. Alternatively, the operator may over-expand the head of the drawbar, causing stress concentration and tool failure. In addition, to facilitate operation, existing drawbar devices are generally provided with a long shaft, but the long shaft is prone to elastic deformation and radial oscillation during pulling, causing the grab head to disengage from the bearing end face, which not only causes dismounting failure, but also may scratch the surface of the crankshaft or cause the needle roller of the bearing to scatter, posing a safety hazard. SUMMARY

[0003] To solve the problems in the prior art, the utility model provides a kind of crankshaft flange center hole needle roller bearing dismounting device to solve the problem of the material of existing device not durable, easy to wear, unreasonable structure, for improving maintenance efficiency, reducing labor load, safeguarding operation safety, with important technical value and economic significance.

[0004] The utility model provides the technical scheme that the technical problem is solved: a kind of crankshaft flange center hole needle roller bearing dismounting device, it includes drawbar main body, screw rod and sleeve;The front end of the drawbar main body is provided with drawbar tension head and annular boss acting into the needle roller bearing to be dismounted, and the rear end of the drawbar main body is gripping end;

[0005] The screw rod is arranged in the drawbar main body, the front end of the screw rod is provided with inverted conical screw head, and the inverted conical inclined surface of the inverted conical screw head is in action with the inner inclined surface of the drawbar tension head;The rear end of the screw rod is provided with tension head control nut and handle nut;

[0006] The sleeve is arranged on the outside of the drawbar main body, the front end of the sleeve is sleeve guide section, and the rear end of the sleeve is sleeve base end;The tail end of the screw rod is arranged out of the sleeve base end.

[0007] Further, the front end of the drawbar main body is also provided with depth limiting block.

[0008] Further, the depth limiting block is arranged at the inner side of the annular boss, and the height of the depth limiting block is greater than the outer diameter of the annular boss.

[0009] Further, the tension head regulating nut is arranged on the puller main body, and is used for locking the puller main body and the screw rod.

[0010] Further, the handle nut is arranged on the sleeve base end, and rotating the handle nut drives the screw rod to move towards the outside of the sleeve.

[0011] Further, the puller main body is internally provided with a puller through hole, and the sleeve base end is provided with a sleeve through hole, and the screw rod passes through the puller through hole and the sleeve through hole in sequence.

[0012] Further, the puller main body, the screw rod, the sleeve and the to-be-disassembled needle bearing are arranged on the same axial line.

[0013] Further, the sleeve is provided with a groove for observing the state of the puller main body and the pulling-out state of the to-be-disassembled needle bearing.

[0014] Further, the sleeve guide end of the sleeve is arranged on the crankshaft flange guide wheel.

[0015] The puller main body, the sleeve and the screw rod are all made of quenched material, so as to improve the wear resistance and stability.

[0016] The device comprises a sleeve, a screw rod and a puller main body, the front end of the screw rod is a reverse conical screw rod head, and the reverse conical screw rod head is arranged on the puller tension head of the front section of the puller main body.

[0017] The device adopts the sleeve to ensure that the axial line of the needle bearing is consistent with the axial line of the tool during disassembly, control the precision, and avoid the elastic deformation and radial swing during the pulling process.

[0018] Traditional puller tools often require significant force from the operator to successfully disassemble needle roller bearings through direct pulling. This invention, however, transforms the rotational motion of the threaded shaft into axial linear motion, greatly reducing the force required for disassembly. This not only reduces the operator's workload but also minimizes fatigue and injury risks caused by prolonged exertion, improving work comfort and safety. Attached Figure Description

[0019] Fig. 1 This is a perspective view of a crankshaft flange center hole needle roller bearing disassembly device.

[0020] Fig. 2 This is a top view of a crankshaft flange center hole needle roller bearing disassembly device.

[0021] Fig. 3 This is a side view of a crankshaft flange center hole needle roller bearing disassembly device.

[0022] Fig. 4 This is a schematic diagram of the operation of a crankshaft flange center hole needle roller bearing disassembly device.

[0023] Fig. 5 This is a diagram showing the fit between the needle roller bearing to be disassembled and the puller body (without screws).

[0024] Fig. 6 This is a diagram showing the fit between the needle roller bearing to be disassembled and the puller body (with screws).

[0025] In the diagram: 1. Puller body, 2. Puller tensioning head, 2a. Inner inclined surface of tensioning head, 3. Annular boss, 4. Depth limiting block, 5. Puller through hole, 6. Grip end, 7. Screw, 8. Inverted conical screw head, 8a. Inverted conical inclined surface, 9. Sleeve, 10. Groove, 11. Sleeve through hole, 12. Sleeve base end, 13. Sleeve guide end, 14. Tensioner adjusting nut, 15. Handle nut, 16. Crankshaft flange center hole, 17. Crankshaft flange guide wheel, 18. Needle roller bearing to be disassembled. Detailed Implementation

[0026] like Figs. 1 to 4 The device shown is a crankshaft flange center hole needle roller bearing disassembly device, including puller body 1, screw 7 and sleeve 9; puller body 1, screw 7, sleeve 9 and needle roller bearing 18 to be disassembled are on the same axis.

[0027] The front end of the puller body 1 is configured to act on the puller tension head 2 and the annular boss 3 inside the needle roller bearing 18 to be disassembled, and the rear end of the puller body 1 is the gripping end 6; the front end of the puller body 1 is also configured with a depth limiting block 4. The depth limiting block 4 is located inside the annular boss 3, and the height of the depth limiting block 4 is greater than the outer diameter of the annular boss 3.

[0028] Screw rod 7 is provided in the puller body 1, the front end of the screw rod 7 is provided with an inverted taper screw head 8, the inverted taper slope 8a of the inverted taper screw head 8 acts with the tension head inner slope 2a of the puller tension head 2; the rear end of the screw rod 7 is provided with a tension head control nut 14 and a handle nut 15; the tension head control nut 14 acts on the puller body 1, used to lock the puller body 1 and the screw rod 7. The handle nut 15 acts on the sleeve base end 12, rotating the handle nut 15 drives the screw rod 7 to move towards the outside of the sleeve.

[0029] The sleeve 9 is provided on the outside of the puller body 1, the front end of the sleeve 9 is a sleeve guide section 13, the rear end of the sleeve 9 is a sleeve base end 12; the tail end of the screw rod 7 passes out of the sleeve base end 12. The sleeve 9 is provided with a groove 10 for observing the state of the puller body 1 and the pulling out of the to-be-removed needle bearing 18. The sleeve guide end 13 of the sleeve 9 acts on the crankshaft flange guide wheel 17.

[0030] The puller body 1 is provided with a puller through hole 5 inside, the sleeve base end 12 is provided with a sleeve through hole 11, the screw rod 7 passes through the puller through hole 5 and the sleeve through hole 11 in turn.

[0031] The puller body 1 is the core structure of the whole device, the front end is provided with a depth limiting block 4, an annular boss 3 and a puller tension head 2 in turn; the puller tension head 2 is provided with a cross-shaped gap for subsequent expansion, the puller tension head 2 can accurately horizontally align the to-be-removed needle bearing 18 in the crankshaft flange center hole 16, and can be smoothly inserted into the to-be-removed needle bearing 18. The annular boss 3 can act on the to-be-removed needle bearing 18 during the tensioning process, and firmly fix the to-be-removed needle bearing 18, providing stable fixing force for pulling out operation. When the puller tension head 2 is inserted into the to-be-removed needle bearing 18 to a specified depth, the depth limiting block 4 will tightly contact with the shell of the to-be-removed needle bearing 18, so as to accurately control the insertion depth of the puller tension head 2, and ensure the accuracy of subsequent operation. The other end of the puller body 1 is provided with a holding end 6, the operator can stabilize the device by clamping the holding end 6, and facilitate subsequent operation.

[0032] The screw rod 7 is provided in the puller through hole 5 of the puller body 1, the front end is an inverted taper screw head 8, the inverted taper slope 8a is provided on the inverted taper screw head 8.

[0033] The rotating tension head regulating nut 14 acts on the tail end of the puller body 1, so that when the screw rod 7 moves relative to the puller body 1, the inverted tapered surface 8a interacts with the tension head inner inclined surface 2a of the puller tension head 2, gradually supporting the puller tension head 2, so that the annular boss 3 acts on the disassembled needle bearing 18, realizing the tensioning and fixing of the disassembled needle bearing 18. At this time, the tension head regulating nut 14 locks the puller body 1 and the screw rod 7. The handle nut 15 is arranged on the outer side of the sleeve 9, and the operator can rotate the handle nut 15 clockwise. The handle nut 15 acts on the sleeve base end 12, drives the screw rod 7 and the puller body 1 to move linearly backward, so as to smoothly pull out the disassembled needle bearing 18 from the crank flange center hole 16.

[0034] The sleeve 9 can be sleeved on the crank flange guide wheel 17, which is designed in a non-interference fitting mode to ensure that the sleeve 9 can be smoothly sleeved into the crank flange guide wheel 17, avoiding additional resistance or jamming during disassembly. The sleeve 9 is provided with a groove 10, through which the operator can observe the state of the puller body 1 and the pulling-out condition of the disassembled needle bearing 18. One end of the sleeve 9 is a sleeve guide end 13 for guiding the sleeve 9 to be sleeved into the crank flange guide wheel 17, and the other end is a sleeve base end 12 provided with a sleeve through hole 11. The screw rod 7 can pass through the sleeve through hole 11, so that the sleeve 9, the screw rod 7 and the disassembled needle bearing 18 are on the same axis, ensuring the accuracy and stability of the disassembly process.

[0035] When the above technical scheme is detected, the crankshaft is first fixed to ensure that it does not move during disassembly. Then, the puller tension head 2 is horizontally aligned with the disassembled needle bearing 18 in the crank flange center hole 16, and is smoothly inserted into the needle bearing until the depth limiting block 4 tightly abuts the shell of the disassembled needle bearing 18, ensuring that the puller tension head 2 reaches the required depth position.

[0036] Then, the clamping holding end 6 is clamped, the tension head regulating nut 14 is rotated clockwise along the screw rod to the position close to the holding end, the tension head regulating nut 14 is tightened with a wrench, the inverted tapered surface 8a of the inverted tapered screw rod head 8 interacts with the tension head inner inclined surface 2a of the puller tension head 2, the inverted tapered screw rod head 8 moves backward relative to the puller tension head 2, gradually supporting the puller tension head 2, until the annular boss 3 firmly fixes the shell of the disassembled needle bearing 18.

[0037] Next, adjust the sleeve 9 to the groove 10 mouth upward, convenient for the operator to observe the state of the puller body 1. From the sleeve guide end 13 into the screw 7, and from the sleeve base end 12 sleeve through hole 11. The sleeve guide end 13 without interference into the crank flange guide wheel 17, so that the disassembly needle bearing 18, sleeve 9 and screw 7 can be adjusted to the same axis.

[0038] Finally, the handle nut 15 clockwise along the screw 7 forward to the sleeve base end 12, continue to clockwise nut 15, handle sleeve base end 12, screw 7 and puller body 1 together with the rear linear motion. From the groove 10 observation port can be seen from the crank flange center hole 16 gradually pulled out the disassembly needle bearing 18, so that the whole process is completed.

[0039] The device of the puller body, sleeve, screw are all quenched, with high wear resistance and stability, solve the traditional puller tool fatigue deformation or fracture problem. The device can be disassembled and assembled, so that the tool is more convenient and fast in maintenance and maintenance. Ensure that the tool is always in good working condition, prolong its service life.

[0040] The above only for the preferred embodiment of the present application, and not to limit the present application, any modification, equivalent replacement and improvement within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A disassembly device for a crankshaft flange center hole needle roller bearing, characterized in that: It includes the puller body (1), screw rod (7) and sleeve (9); The front end of the puller body (1) is provided with a puller tension head (2) acting on the to-be-removed needle bearing (18) and an annular boss (3), and the rear end of the puller body (1) is a holding end (6); The screw rod (7) is arranged in the puller body (1), the front end of the screw rod (7) is provided with an inverted conical screw rod head (8), the inverted conical surface (8a) of the inverted conical screw rod head (8) is in action with the inner inclined surface (2a) of the puller tension head (2), and the rear end of the screw rod (7) is provided with a tension head control nut (14) and a handle nut (15); The sleeve (9) is arranged outside the puller body (1), the front end of the sleeve (9) is a sleeve guide end (13), the rear end of the sleeve (9) is a sleeve base end (12), and the tail end of the screw rod (7) penetrates through the sleeve base end (12).

2. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The front end of the puller body (1) is further provided with a depth limiting block (4).

3. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 2, characterized in that: The depth limiting block (4) is arranged inside the annular boss (3), and the height of the depth limiting block (4) is greater than the outer diameter of the annular boss (3).

4. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The tension head control nut (14) acts on the puller body (1) and is used for locking the puller body (1) and the screw rod (7).

5. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The handle nut (15) acts on the sleeve base end (12), and rotating the handle nut (15) drives the screw rod (7) to move towards the outside of the sleeve.

6. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The puller body (1) is internally provided with a puller through hole (5), the sleeve base end (12) is provided with a sleeve through hole (11), and the screw rod (7) penetrates through the puller through hole (5) and the sleeve through hole (11) in sequence.

7. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The puller body (1), the screw rod (7), the sleeve (9) and the to-be-removed needle bearing (18) are on the same axial line.

8. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The sleeve (9) is provided with a groove (10) for observing the state of the puller body (1) and the pulling-out condition of the to-be-removed needle bearing (18).

9. A device for removing a needle bearing from a central bore of a crankshaft flange according to claim 1, characterized in that: The sleeve guide end (13) of the sleeve (9) acts on the crank flange guide wheel (17).

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