Puller structure for disassembling conical ball bearing of cam shaft

Abstract

According to the puller structure for disassembling the conical ball bearing of the cam shaft, the bearing to be disassembled can be pressed and disassembled after being placed in the alignment notch, the disassembling efficiency of the bearing is improved, and the manufacturing cost is low. The device comprises a placing seat, the upper surface of the placing seat is provided with a concave profiling positioning groove, the profiling positioning groove comprises a shaft body suspension cavity, a bearing suspension cavity and a shaft body supporting notch groove, the shaft body supporting notch groove is formed corresponding to one end side of the length direction of the placing seat, and clamping jaws are arranged on the two sides of the shaft body supporting notch groove; the opposite distance between the clamping jaws is smaller than the outer diameter of an inner ring of a cam shaft conical ball bearing and larger than the outer diameter of a corresponding shaft body, a supporting block is arranged at the bottom of the shaft body supporting notch groove, the upper surface of the supporting block is used for supporting the shaft body, and a penetrating threaded hole is formed in the front end, corresponding to the shaft body suspension cavity, of the containing base. The tip cone comprises a stud section and a tip cone body, and the tip end of the tip cone body is used for abutting against the end face position of the small-diameter end of the shaft body.

Description

Technical Field

[0001] This utility model relates to the technical field of camshaft bearing disassembly, specifically a puller structure for disassembling camshaft tapered ball bearings. Background Technology

[0002] In a typical four-stroke diesel engine, the camshaft speed of the fuel injection pump is half the crankshaft speed. To ensure high injection pressure and precise injection advance angle (within 1° of crankshaft rotation), the transmission between the diesel engine and the fuel injection pump must have sufficient strength and rigidity. For proper lubrication of the moving parts of the fuel injection pump (camshaft, tappets, etc.), a lubrication circuit should be connected to the engine's lubrication passages. When the camshaft rotates, the interaction between the roller tappets and the plunger spring causes the plunger to reciprocate within the plunger sleeve, generating pressure and injecting fuel through the delivery valve, high-pressure fuel line, and injector into the diesel engine cylinder. As a crucial component within the NB pump, the camshaft requires the disassembly of tapered ball bearings during assembly for clearance or instantaneous pressure adjustments. Existing technology typically employs a three-jaw puller for disassembly, which necessitates adjusting each jaw to grip the corresponding end of the bearing. This requires precise alignment of the three jaws for disassembly, resulting in low disassembly efficiency. Therefore, there is an urgent need to develop a puller structure that can improve disassembly efficiency. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a puller structure for disassembling tapered ball bearings on camshafts. After placing the bearing to be disassembled in the alignment notch, it can be press-fitted for disassembly, which improves the disassembly efficiency of the bearing and has low manufacturing cost.

[0004] A puller structure for disassembling tapered ball bearings on camshafts, characterized in that it comprises:

[0005] The placement seat has a concave contour positioning groove on its upper surface. The contour positioning groove includes a shaft suspension cavity, a bearing suspension cavity, and a shaft support notch. The shaft support notch is provided on one end of the placement seat along its length. Claws are provided on both sides of the shaft support notch. The opposing distance between the claws is less than the outer diameter of the inner ring of the camshaft tapered ball bearing and greater than the outer diameter of the corresponding shaft. A support block is provided at the bottom of the shaft support notch. The upper surface of the support block is used to support the shaft. A through threaded hole is provided at the front end of the placement seat corresponding to the shaft suspension cavity.

[0006] And a top cone, which includes a stud section and a top cone body, the tip of which is used to abut against the end face of the small diameter end of the shaft.

[0007] The stud section is threadedly connected to the through threaded hole. The top cone body is located in the shaft suspension cavity. The outer end of the stud section is exposed in the mounting seat. The tapered ball bearing of the camshaft is placed in the bearing suspension cavity. The inner ring of the tapered ball bearing is in close contact with the inner wall of the chuck and the inner wall of the support block, respectively. The tip of the top cone body abuts against the end face of the small diameter end of the camshaft shaft. The operator drives the stud section to rotate, thereby moving the tapered ball bearing relative to the small diameter end area of ​​the camshaft, thus completing the disassembly of the tapered ball bearing.

[0008] Its further features are:

[0009] The placement base includes a base plate, two side plates, a front plate, a rear plate, and a top cover plate;

[0010] A threaded hole mounting seat is fixed to the inner surface of the front end plate. The threaded hole mounting seat is provided with an axially penetrating through threaded hole. A through hole is opened at the corresponding position of the front end plate. A reinforcing plate is also welded to the outer surface of the front end plate. A guide hole is provided on the reinforcing plate at the position corresponding to the through hole, which prevents the through threaded hole from deforming or shifting.

[0011] The upper cover plate is a cover area corresponding to the threaded hole mounting seat. The upper cover plate is provided with corresponding notches corresponding to the positions of the shaft suspension cavity, bearing suspension cavity, and shaft support notch groove. The upper cover plate is welded to the corresponding upper surfaces of the two side plates, the front plate, and the rear plate.

[0012] The rear end plate has a notch corresponding to the shaft support notch slot. The bottom area of ​​the rear end plate is the support block, and the two sides of the rear end plate are the corresponding claws, which makes the claw manufacturing simple and quick.

[0013] The stud section of the top cone also includes a driving end;

[0014] The drive end is exposed outside the placement seat and has a hexagonal structure, which allows the top cone to be reliably driven toward the rear end plate by a wrench or power tool.

[0015] By adopting this utility model, the small-diameter end of the camshaft with tapered ball bearings and the tapered ball bearings are both placed in the contour positioning groove, so that the inner ring end face of the tapered ball bearings is in close contact with the inner wall of the chuck and the inner wall of the support block, respectively, and the camshaft shaft is supported on the upper surface of the support block, so that the tip of the top cone body abuts against the end face of the small-diameter end of the camshaft shaft. The operator drives the stud section to rotate, thereby moving the tapered ball bearings relative to the small-diameter end area of ​​the camshaft, thus completing the disassembly of the tapered ball bearings. There is no need to adjust the position of the chucks. After placing the bearing to be disassembled in the alignment notch, it can be pressed and disassembled. This improves the disassembly efficiency of the bearings, and the entire puller structure does not need to be tightly sealed, resulting in low manufacturing costs. Attached Figure Description

[0016] Figure 1 This is a top view of the placement base of this utility model;

[0017] Figure 2 for Figure 1 The left view;

[0018] Figure 3 for Figure 1 The right view;

[0019] Figure 4 This is a front view of the top cone of this utility model;

[0020] Figure 5 A top view of the assembly of a camshaft with tapered ball bearings being disassembled;

[0021] The names corresponding to the serial numbers in the diagram are as follows:

[0022] 1. Tapered ball bearing; 2. Camshaft;

[0023] The components include: a base plate 10, a bottom plate 11, a side plate 12, a front end plate 13, a through hole 131, a rear end plate 14, a top cover plate 15, a reinforcing plate 16, a guide hole 161, a top cone 20, a stud section 21, a top cone body 22, a tip 221, a drive end 23, a contour positioning groove 30, a shaft suspension cavity 31, a bearing suspension cavity 32, a shaft support notch groove 33, a chuck 40, a support block 50, a threaded hole mounting base 60, and a through threaded hole 61. Detailed Implementation

[0024] A puller structure for disassembling tapered ball bearings on camshafts, see Figures 1-5 It includes a placement seat 10 and a top cone 20;

[0025] The upper surface of the placement seat 10 is provided with a concave contour positioning groove 30, which includes a shaft suspension cavity 31, a bearing suspension cavity 32, and a shaft support notch 33. The shaft support notch 33 is provided on one end of the placement seat 10 along its length. Claws 40 are provided on both sides of the shaft support notch 33. The opposing distance between the claws 40 is less than the outer diameter of the inner ring of the camshaft tapered ball bearing 1 and greater than the outer diameter of the shaft at the corresponding position of the camshaft 2. A support block 50 is provided at the bottom of the shaft support notch 33. The upper surface of the support block 50 is used to support the shaft at the corresponding position of the camshaft 2. A through threaded hole 61 is provided at the front end of the placement seat 10 corresponding to the shaft suspension cavity 31.

[0026] The top cone 20 includes a stud section 21 and a top cone body 22. The tip 221 of the top cone body 22 is used to abut against the end face of the small diameter end of the camshaft 2.

[0027] The stud section 21 is threaded through the threaded hole 61. The top cone body 22 is located in the shaft suspension cavity 31. The outer end of the stud section 21 is exposed in the placement seat 10. The tapered ball bearing 1 of the camshaft 2 is placed in the bearing suspension cavity 32. The inner ring of the tapered ball bearing 1 is in close contact with the inner wall of the pawl 40 and the inner wall of the support block 50, respectively. The tip 221 of the top cone body 22 abuts against the end face of the small diameter end of the camshaft 2. The operator drives the stud section 21 to rotate, thereby moving the tapered ball bearing 1 relative to the small diameter end area of ​​the camshaft 2, thus completing the disassembly operation of the tapered ball bearing 1.

[0028] In practice, to reduce manufacturing costs, the placement base 10 is obtained through assembly and welding;

[0029] The placement seat 10 includes a base plate 11, two side plates 12, a front plate 13, a rear plate 14, and a top cover plate 15;

[0030] A threaded hole mounting seat 60 is fixed to the inner surface of the front end plate 13. The threaded hole mounting seat 60 is provided with an axial through threaded hole 61. A through hole 131 is opened at the corresponding position of the front end plate 13. A reinforcing plate 16 is also welded to the outer surface of the front end plate 13. A guide hole 161 is provided on the reinforcing plate 16 at the position of the through hole, which prevents the through threaded hole 61 from deforming or shifting.

[0031] The upper cover plate 15 is a cover area corresponding to the threaded hole mounting seat 60. The upper cover plate 15 is provided with corresponding notches corresponding to the positions of the shaft suspension cavity 31, bearing suspension cavity 32, and shaft support notch 33. The upper cover plate 15 is welded to the corresponding upper surfaces of the two side plates 12, the front end plate 13, and the rear end plate 14.

[0032] The rear end plate 14 has a notch corresponding to the shaft support notch 33. The bottom area of ​​the rear end plate 14 is the support block 50, and the two sides of the rear end plate 14 are the corresponding claws 40, which makes the claws 40 simple and quick to manufacture.

[0033] The stud section 21 of the top cone 20 also includes a drive end 23;

[0034] The drive end 23 is exposed outside the mounting base 10 and has a hexagonal structure, which allows the top cone to be reliably driven toward the rear end plate by a wrench or power tool.

[0035] Its working principle is as follows: The small diameter end of the camshaft with tapered ball bearings and the tapered ball bearings are both placed in the contour positioning groove, so that the inner ring end face of the tapered ball bearings is in close contact with the inner wall of the chuck and the inner wall of the support block, respectively, and the camshaft shaft is supported on the upper surface of the support block, so that the tip of the top cone body abuts against the end face of the small diameter end of the camshaft shaft. The operator drives the stud section to rotate, thereby moving the tapered ball bearings relative to the small diameter end area of ​​the camshaft, thus completing the disassembly of the tapered ball bearings. It does not require adjustment of the chuck position. After the bearing to be disassembled is placed in the alignment notch, it can be pressed and disassembled, which improves the disassembly efficiency of the bearings. Moreover, the entire puller structure does not require tight separation, resulting in low manufacturing cost.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A puller structure for disassembling tapered ball bearings on camshafts, characterized in that, It includes: The placement seat has a concave contour positioning groove on its upper surface. The contour positioning groove includes a shaft suspension cavity, a bearing suspension cavity, and a shaft support notch. The shaft support notch is provided on one end of the placement seat along its length. Claws are provided on both sides of the shaft support notch. The opposing distance between the claws is less than the outer diameter of the inner ring of the camshaft tapered ball bearing and greater than the outer diameter of the corresponding shaft. A support block is provided at the bottom of the shaft support notch. The upper surface of the support block is used to support the shaft. A through threaded hole is provided at the front end of the placement seat corresponding to the shaft suspension cavity. And a top cone, which includes a stud section and a top cone body, the tip of which is used to abut against the end face of the small diameter end of the shaft. The stud section is threadedly connected to the through threaded hole. The top cone body is located in the shaft suspension cavity. The outer end of the stud section is exposed in the mounting seat. The tapered ball bearing of the camshaft is placed in the bearing suspension cavity. The inner ring of the tapered ball bearing is in close contact with the inner wall of the chuck and the inner wall of the support block, respectively. The tip of the top cone body abuts against the end face of the small diameter end of the camshaft shaft. The operator drives the stud section to rotate, thereby moving the tapered ball bearing relative to the small diameter end area of ​​the camshaft, thus completing the disassembly of the tapered ball bearing.

2. The puller structure for disassembling tapered ball bearings of camshafts according to claim 1, characterized in that: The placement base includes a base plate, two side plates, a front plate, a rear plate, and a top cover plate.

3. A puller structure for disassembling tapered ball bearings of a camshaft according to claim 2, characterized in that: A threaded hole mounting base is fixed to the inner surface of the front end plate. The threaded hole mounting base is provided with an axially penetrating through threaded hole. A through hole is opened at the corresponding position of the front end plate. A reinforcing plate is also welded to the outer surface of the front end plate. A guide hole is provided on the reinforcing plate at the position corresponding to the through hole.

4. A puller structure for disassembling tapered ball bearings of a camshaft according to claim 3, characterized in that: The upper cover plate is a cover area corresponding to the threaded hole mounting seat. The upper cover plate is provided with corresponding notches at the positions of the shaft suspension cavity, bearing suspension cavity, and shaft support notch groove. The upper cover plate is welded to the corresponding upper surfaces of the two side plates, the front plate, and the rear plate.

5. A puller structure for disassembling tapered ball bearings of camshafts according to claim 4, characterized in that: The rear end plate has a notch corresponding to the shaft support notch groove. The bottom area of ​​the rear end plate is the support block, and the two sides of the rear end plate are the corresponding claws.

6. A puller structure for disassembling tapered ball bearings of camshafts according to claim 1, characterized in that: The stud section of the top cone also includes a driving end.

7. A puller structure for disassembling tapered ball bearings of a camshaft according to claim 6, characterized in that: The drive end is exposed on the placement base and has a hexagonal structure.

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