A conical surface interference coupling high pressure oil pump wheel dismounting tool

Abstract

The application discloses a kind of dismounting tools of conical face interference coupling high-pressure oil pump wheel, belong to the field of engine high-pressure oil pump wheel maintenance.The dismounting tool includes support plate, is set with threaded hole in support plate, is equipped with center screw assembly in threaded hole, the bottom of center screw assembly is connected with hex sleeve, is installed with threaded protection sleeve on hex sleeve inner wall, the both ends of support plate top are equipped with waist hole, double-end screw is equipped in waist hole, recess is set in the side surface of support plate.The application can directly separate high-pressure oil pump wheel and accessory on engine, and can reduce the dismounting space around high-pressure oil pump wheel, so as to reduce the design size and weight of surrounding parts, realize lightweight design.

Description

Technical Field

[0001] This invention relates to the field of engine high-pressure oil pump wheel repair, and specifically to a disassembly tool for a high-pressure oil pump wheel with a conical interference fit. Background Technology

[0002] Currently, high-pressure oil pump impellers in engines are widely mounted on drive shafts using a conical interference fit with a nut. This conical interference fit generates pressure between the mating surfaces of the high-pressure oil pump impeller and the drive shaft, utilizing friction to transmit torque and axial force. This connection structure offers good centering and high load-bearing capacity. However, the conical interference fit also has a drawback: an axial force must be applied to disassemble the high-pressure oil pump impeller.

[0003] In existing technology, when disassembling this type of high-pressure oil pump impeller, the high-pressure oil pump impeller and accessories are generally disassembled as a whole, and then tools are used to separate the high-pressure oil pump impeller and accessories. For example, the patent with authorization announcement number CN 212170264 U, entitled "A Gear Disassembly Tool", belongs to this type of tool. However, sometimes due to limited space, it is not possible to disassemble the high-pressure oil pump impeller and accessories as a whole, and in this case, the aforementioned tool cannot be used.

[0004] Patent CN 211439792 U, entitled "Pulley Removal Tool," allows for the direct separation of a high-pressure oil pump pulley and its accessories. To protect the pulley mounting shaft and prevent wear from direct contact between the push rod and the shaft, the patent incorporates ball bearings within the mounting groove. However, using ball bearings increases the end size, widening the distance between the pull rods on both sides. Since the engine's high-pressure oil pump pulley is relatively small, a more compact removal tool is required. Furthermore, the patent does not explain how to prevent the pull rods from bearing torque that could damage the auxiliary disassembly threaded holes on the pulley. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a disassembly tool for a high-pressure oil pump impeller with a conical interference fit. This allows for direct separation of the high-pressure oil pump impeller and accessories from the engine.

[0006] To achieve the above objectives, this invention provides a disassembly tool for a high-pressure oil pump impeller with a conical interference fit. It includes a support plate with a threaded hole. A central screw assembly is housed within the threaded hole. A hexagonal sleeve is connected to the bottom of the central screw assembly. A threaded protective sleeve is installed on the inner wall of the hexagonal sleeve. The support plate has waist holes at both ends at its top, each containing a double-ended screw. The support plate also has grooves on its sides.

[0007] Preferably, the hexagonal sleeve is made of stainless steel, the threaded protective sleeve is made of polytetrafluoroethylene, and the threaded hole is a trapezoidal threaded hole.

[0008] Preferably, the support plate has a cross-shaped boss in the central area, symmetrical grooves on both sides of the cross-shaped boss, waist holes symmetrically provided on both sides of the cross-shaped boss, and a threaded hole in the center of the cross-shaped boss.

[0009] Preferably, the central screw assembly includes a hexagonal head and a rod body. The rod body consists of a threaded rod and a pressure rod fixedly connected to the bottom of the threaded rod. The top of the hexagonal sleeve has a rod body mounting groove. Two symmetrically arranged threaded holes are provided on the side wall of the rod body mounting groove. Each threaded hole is provided with a limiting screw that mates with an annular limiting groove.

[0010] Preferably, the threaded hole is a tapered hole, and the limiting screw is a tapered limiting screw.

[0011] Preferably, the bottom of the central screw assembly is provided with a plurality of ball bearing mounting holes, and ball bearings are installed in the ball bearing mounting holes.

[0012] Preferably, the ball bearing mounting holes are evenly spaced at the bottom of the central screw assembly.

[0013] Preferably, the ball is made of stainless steel, and the diameter of the ball 3 is selected according to GB / T 308.1 "Rolling bearings - Balls - Part 1: Steel balls" standard, with a nominal diameter of 2mm.

[0014] Preferably, the threaded protective sleeve is annular, and the bottom of the hexagonal sleeve has a circular mounting groove that mates with the threaded protective sleeve. The circular mounting groove is not connected to the rod mounting groove.

[0015] Preferably, the outer wall of the threaded protective sleeve is provided with a limiting tenon, and the inner wall of the circular mounting groove is provided with an annular groove that cooperates with the limiting tenon.

[0016] Preferably, the cross-sectional shape of the limiting tenon is an isosceles trapezoid with a height of 0.1 mm, and the depth of the annular groove is 0.2 mm.

[0017] Preferably, the threaded protective sleeve has four evenly spaced disassembly grooves on its top. When the threaded protective sleeve needs to be removed for replacement, the short side of an "L"-shaped repair tool is inserted into the disassembly groove, hooked into the groove, and the threaded protective sleeve is pulled out.

[0018] Preferably, the inner wall of the threaded protective sleeve has a first chamfer at the bottom, and the outer wall of the threaded protective sleeve has a second chamfer at the top. The first chamfer guides the threaded protective sleeve to be quickly nested into the threaded section at the front end of the drive shaft, and the second chamfer guides the threaded protective sleeve to be quickly installed into the hexagonal sleeve.

[0019] Preferably, one end of the double-ended screw is fixed in the waist hole by a hexagonal flange nut, and the other end is used to fix the disassembly tool of the high-pressure oil pump wheel onto the high-pressure oil pump wheel.

[0020] Preferably, the top of the groove is provided with a limiting hole.

[0021] The beneficial effects of this invention are:

[0022] 1. This invention can directly separate the high-pressure oil pump wheel and accessories from the engine, and can reduce the disassembly space around the high-pressure oil pump wheel, thereby reducing the design size and weight of surrounding parts and achieving lightweight design.

[0023] 2. This invention balances the disassembly torque by having workers apply force to the support plate, which can effectively prevent the double-ended stud from twisting and the high-pressure oil pump shaft from rotating, thus preventing damage to the fastening threads of the high-pressure oil pump wheel on the drive shaft and the auxiliary disassembly threaded holes on the high-pressure oil pump wheel.

[0024] 3. This invention does not subject to axial impact loads during disassembly, which can effectively prevent damage to the bearings of the high-pressure oil pump during disassembly.

[0025] 4. This invention directly machines ball bearing mounting holes onto the central screw, eliminating the need for ball bearings, resulting in a more compact structure and reduced costs. The ball bearing mounting holes maintain the clearance between the balls, preventing them from rubbing against each other and ensuring a more even load distribution. With the same mounting hole inner diameter and the same ball diameter, more balls can be used compared to ball bearings, allowing for greater axial force loads. Attached Figure Description

[0026] Figure 1 This is a perspective view of the present invention;

[0027] Figure 2 This is a structural diagram of the support plate of the present invention;

[0028] Figure 3 This is a structural diagram of the central screw assembly of the present invention;

[0029] Figure 4 This is a perspective view of the hexagonal sleeve of the present invention;

[0030] Figure 5 for Figure 4 Partial cross-sectional view;

[0031] Figure 6 This is a structural diagram of the threaded protective sleeve of the present invention;

[0032] Figure 7 This is a structural diagram of the present invention mounted on a high-pressure oil pump impeller;

[0033] Figure 8 This is a structural diagram of the present invention in use.

[0034] Figure label:

[0035] 1. Support plate, 11. Threaded hole, 12. Waist hole, 13. Groove, 14. Cross boss, 141. Limiting hole.

[0036] 2. Center screw assembly, 21. Hexagonal head, 22. Threaded rod, 23. Pressure rod, 231. Annular limiting groove, 24. Ball bearing,

[0037] 3. Hexagonal sleeve; 31. Rod mounting groove; 32. Threaded hole; 33. Limit screw; 34. Circular mounting slot.

[0038] 4. Threaded protective sleeve, 41. Limiting tenon, 42. Disassembly groove, 43. First chamfer, 44. Second chamfer.

[0039] 5. Double-ended screw, 51. Hexagonal flange nut

[0040] 6. High-pressure oil pump wheel, 61. Auxiliary disassembly threaded hole

[0041] 7. Wrench

[0042] 8 timing chain chambers

[0043] 9. High-pressure oil pump drive shaft. Detailed Implementation

[0044] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0045] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0046] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] Example

[0051] like Figures 1-6 The disassembly tool for the high-pressure oil pump impeller with a conical interference fit shown includes a support plate 1. The support plate 1 has a cross-shaped boss 14 in its central area, and symmetrical grooves 13 on both sides of the cross-shaped boss 14. A limiting hole 141 is provided at the top of each groove 13. Symmetrical waist holes 12 are provided on both sides of the cross-shaped boss 14 of the support plate 1. Double-ended screws 5 are installed within the waist holes 12. One end of the double-ended screw 5 is fixed within the waist hole 12 by a hexagonal flange nut 51, and the other end is used to fix the wheel disassembly tool onto the high-pressure oil pump impeller.

[0052] A threaded hole 11 is provided at the center of the cross-shaped boss 14. A central screw assembly 2 is provided inside the threaded hole 11. The central screw assembly 2 includes a hexagonal head 21 and a rod body. The rod body consists of a threaded rod 22 and a pressure rod 23 fixedly connected to the bottom of the threaded rod 22. An annular limiting groove 231 is provided in the middle area of ​​the pressure rod 23. A rod body mounting groove 31 is provided at the top of the hexagonal sleeve 3. Two symmetrically arranged threaded holes 32 are provided on the side wall of the rod body mounting groove 31. Each threaded hole 32 is provided with a limiting screw 33 that mates with the annular limiting groove 231. Several ball bearing mounting holes are provided at the bottom of the central screw assembly 2, and balls 24 are installed in the ball bearing mounting holes.

[0053] The bottom of the central screw assembly 2 is connected to a stainless steel hexagonal sleeve 3. A polytetrafluoroethylene (PTFE) threaded protective sleeve 4 is installed on the inner wall of the hexagonal sleeve 3. The threaded protective sleeve 4 is annular, and the bottom of the hexagonal sleeve 3 has a circular mounting groove 34 that mates with the threaded protective sleeve 4. A limiting tenon 41 is provided on the outer wall of the threaded protective sleeve 4, and an annular groove that mates with the limiting tenon 41 is provided on the inner wall of the circular mounting groove 34. Four disassembly grooves 42 are evenly spaced on the top of the threaded protective sleeve 4. A first chamfer 43 is provided at the bottom of the inner wall of the threaded protective sleeve 4, and a second chamfer 44 is provided at the top of the outer wall of the threaded protective sleeve 4.

[0054] The following describes the operating procedure for using the disassembly tool for the above-mentioned high-pressure oil pump impeller with a conical interference fit:

[0055] The first step is to assemble the high-pressure oil pump wheel disassembly tool. Press the threaded protective sleeve 4 into the circular mounting groove 34 at the bottom of the hexagonal sleeve 3 until its limiting tenon 41 is engaged in the annular groove on the inner wall of the circular mounting groove 34. Apply grease to the threaded rod 22 of the center screw assembly 2 and screw it into the threaded hole 11 on the support plate 1. Apply grease to the ball bearing 24 and install it into the ball bearing 24 mounting hole at the bottom of the center screw assembly 2. Then insert the center screw assembly 2 into the rod mounting groove 31 of the hexagonal sleeve 3, apply thread-locking adhesive to the limiting screw 33, screw it into the threaded hole 32 and tighten it.

[0056] like Figures 7-8 As shown, the second step involves positioning the disassembly tool for the high-pressure oil pump wheel. Screw one end of each of the two double-ended screws 5 into the two auxiliary disassembly threaded holes 61 of the high-pressure oil pump wheel 6. Then, fix the other ends of the two double-ended screws 5 into the two waist holes 12 using hexagonal flange nuts 51, thereby securing the high-pressure oil pump wheel disassembly tool. If the timing chain chamber 8 obstructs the groove 13 on the support plate 1, preventing the wrench 7 from being inserted into the groove 13, rotate the center screw assembly 2 clockwise to adjust the support plate 1 and the hexagonal sleeve 3 to a suitable height difference. Finally, fit the hexagonal sleeve 3 onto the threaded section at the front end of the drive shaft.

[0057] The third step is to disassemble the high-pressure oil pump wheel. Insert the wrench into the groove 13 on the support plate 1 until the retractable steel ball on the head of the wrench 7 is engaged in the limiting hole 141 of the cross boss 14. Place the wrench with the socket on the hexagonal head 21 of the central screw assembly 2 and apply torque clockwise. During this process, the central screw assembly 2 rotates clockwise, and the trapezoidal thread on the threaded rod 22 applies an outward thrust and a clockwise torque to the support plate 1.

[0058] After the support plate 1 bears the outward thrust of the trapezoidal thread on the threaded rod 22, it will apply an outward thrust to the hexagonal flange nuts 51 on both sides. The hexagonal flange nuts 51 apply a tensile force to the double-ended screw 5 through the thread, which in turn applies a tensile force to the high-pressure oil pump wheel 6, i.e., the disassembly force of the high-pressure oil pump wheel 6.

[0059] At the same time, the support plate 1 generates an inward thrust on the trapezoidal thread on the threaded rod 22, which pushes the pressure rod 23 to press the ball 24. The ball 24 is pressed by the force to press the hexagonal sleeve 3, and the hexagonal sleeve 3 is pressed by the force to press the high-pressure oil pump drive shaft 9, thus generating a force.

[0060] When the disassembly force F1 does not exceed the maximum static friction between the high-pressure oil pump wheel 6 and the high-pressure oil pump drive shaft 9, the high-pressure oil pump wheel 6 applies a forward pulling force to the high-pressure oil pump drive shaft 9, while the hexagonal sleeve 3 applies a backward pressure F2 to the drive shaft. The two are perfectly balanced, so the high-pressure oil pump drive shaft 9 does not apply an axial force to the high-pressure oil pump bearing and thus damage the bearing.

[0061] The clockwise torque applied to the support plate 1 by the trapezoidal thread on the threaded rod 22 is balanced by the force applied by the hand to the wrench 7, so the support plate 1 will not apply torque to the two double-ended screws 5 and damage the auxiliary disassembly threaded hole a1 on the high-pressure oil pump wheel 6.

[0062] There are balls 3 between the pressure rod 23 and the hexagonal sleeve 3. The friction between them is much less than the friction between the hexagonal sleeve 3 and the high-pressure oil pump drive shaft 9. Therefore, the central screw assembly 2 will not transmit torque to the hexagonal sleeve 3, and thus will not cause relative rotation between the hexagonal sleeve 3, the threaded protective sleeve 4, and the high-pressure oil pump drive shaft 9. This effectively delays the wear of the threaded protective sleeve 4 and avoids damage to the threads at the front end of the drive shaft. Similarly, because the central screw assembly 2 does not transmit torque to the hexagonal sleeve 3, the high-pressure oil pump wheel 6 will not apply torque to the two double-ended screws 5, thereby damaging the auxiliary disassembly threaded hole 61 on the high-pressure oil pump wheel 6.

[0063] When the disassembly force exceeds the maximum static friction between the high-pressure oil pump wheel 6 and the high-pressure oil pump drive shaft 9, the high-pressure oil pump wheel 6 will detach from the high-pressure oil pump drive shaft 9. At the same moment of detachment, the force exerted by the high-pressure oil pump wheel disassembly tool on the high-pressure oil pump drive shaft 9 will also disappear. Therefore, at this time, the high-pressure oil pump drive shaft 9 will not exert an axial force on the high-pressure oil pump bearing and damage the bearing.

[0064] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A disassembly tool for a high-pressure oil pump impeller with a conical interference fit, characterized in that: The system includes a support plate (1), on which a threaded hole (11) is provided. A central screw assembly (2) is provided inside the threaded hole (11). A hexagonal sleeve (3) is connected to the bottom of the central screw assembly (2). A threaded protective sleeve (4) is installed on the inner wall of the hexagonal sleeve (3). Waist holes (12) are provided at both ends of the top of the support plate (1). A double-ended screw (5) is provided inside the waist holes (12). A groove (13) is provided on the side of the support plate (1). The central screw assembly (2) It includes a hexagonal head (21) and a rod body. The rod body consists of a threaded rod (22) and a pressure rod (23) fixedly connected to the bottom of the threaded rod (22). The pressure rod (23) has an annular limiting groove (231) in the middle area. The top of the hexagonal sleeve (3) has a rod body mounting groove (31). The side wall of the rod body mounting groove (31) has two symmetrically arranged threaded holes (32). Each threaded hole (32) is provided with a limiting screw (33) that cooperates with the annular limiting groove (231).

2. The disassembly tool for the high-pressure oil pump impeller with a conical interference fit according to claim 1, characterized in that: The support plate (1) has a cross boss (14) in the center area, and symmetrical grooves (13) are provided on both sides of the cross boss (14). Waist holes (12) are provided symmetrically on both sides of the cross boss (14) of the support plate (1). A threaded hole (11) is provided in the center of the cross boss (14).

3. The disassembly tool for the high-pressure oil pump impeller with a conical interference fit according to claim 1, characterized in that: The bottom of the central screw assembly (2) is provided with several ball bearing mounting holes, and ball bearings (24) are installed in the ball bearing mounting holes.

4. The disassembly tool for the high-pressure oil pump impeller with a conical surface interference fit according to claim 1, characterized in that: The threaded protective sleeve (4) is annular, and the bottom of the hexagonal sleeve (3) is provided with a circular mounting groove (34) that matches the threaded protective sleeve (4).

5. The disassembly tool for the high-pressure oil pump impeller with a conical surface interference fit according to claim 4, characterized in that: The outer wall of the threaded protective sleeve (4) is provided with a limiting tenon (41), and the inner wall of the circular mounting groove (34) is provided with an annular groove that cooperates with the limiting tenon (41).

6. The disassembly tool for the high-pressure oil pump impeller with a conical interference fit according to claim 1, characterized in that: The top of the threaded protective sleeve (4) is provided with a disassembly groove (42), and there are four disassembly grooves (42) evenly spaced on the top of the threaded protective sleeve (4).

7. The disassembly tool for the high-pressure oil pump impeller with a conical interference fit according to claim 1, characterized in that: The inner wall of the threaded protective sleeve (4) is provided with a first chamfer (43) at the bottom and the outer wall of the threaded protective sleeve (4) is provided with a second chamfer (44) at the top.

8. The disassembly tool for the high-pressure oil pump impeller with a conical interference fit according to claim 1, characterized in that: One end of the double-ended screw (5) is fixed in the waist hole (12) by a hexagonal flange nut (51), and the other end is used to fix the wheel disassembly tool to the high-pressure oil pump wheel.

9. The disassembly tool for the high-pressure oil pump impeller with a conical interference fit according to claim 1, characterized in that: The top of the groove (13) is provided with a limiting hole (141).

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