A device for dismounting the short shaft and clutch in an inner-rotor motor

Abstract

This invention relates to the field of disassembly equipment technology, and in particular to a disassembly device for a short shaft and clutch inside a mid-drive motor. The disassembly device includes a base, a pressure head, and several pressure blocks. The base has a material discharge cavity in the middle, and a receiving cavity for placing the short shaft is opened on the base, which is connected to the material discharge cavity. The pressure head and pressure blocks are slidably connected, and the pressure blocks can extend into the gap between the clutch and the sealing ring. The pressure head is arranged in the connecting cavity of the short shaft. By extending the pressure blocks into the gap between the clutch and the sealing ring, and by using the cooperation of the pressure head and the push rod, the striking force is evenly transmitted to the sealing ring, realizing the smooth detachment of the sealing ring. This avoids the deflection and slippage problems caused by localized force in the traditional chisel striking method, effectively protecting the clutch and short shaft from damage and improving the recycling rate of parts.

Description

Technical Field

[0001] This invention relates to the field of disassembly equipment technology, and in particular to a disassembly device for a short shaft and clutch inside a mid-mounted motor. Background Technology

[0002] During testing, to achieve cost savings and resource reuse, it is often necessary to disassemble and recycle reusable parts inside the motor. In the internal structure of a mid-drive motor, the assembly relationship between the short shaft and the clutch is quite unique: the short shaft has a connecting cavity, and the clutch is arranged in a mounting groove opened in the lower part of the inner wall of the connecting cavity. A sealing ring is arranged at the opening of the mounting groove. The clutch includes a cage and several wedges arranged in the cage. The wedges protrude from the inner wall of the cage, and a gap is formed between the protruding part of the wedge and the sealing ring.

[0003] In existing technology, when the clutch needs to be removed from the short shaft for recycling, operators typically use the following method: insert a chisel into the end of the connecting cavity with the mating part, press the chisel against the edge of the sealing ring, and then remove the sealing ring by tapping it. After the sealing ring falls off, the clutch can then be removed. However, the above method has obvious drawbacks: during the tapping process with the chisel against the edge of the sealing ring, the force is concentrated on a local edge of the sealing ring, and the impact force generated by the tapping can easily cause the chisel to slip or deviate. This not only makes it difficult to ensure that the sealing ring falls off evenly, but also easily causes the inner wall of the connecting cavity of the short shaft, the spline mating part, and the clutch itself to be damaged during the tapping process. This results in the damage and scrapping of parts that could have been reused, reducing disassembly efficiency and yield.

[0004] Furthermore, due to the narrow internal space of the short shaft's connecting cavity and the small gap between the clutch and the sealing ring, the operator's vision is obstructed, making it difficult to accurately judge the insertion position and striking angle of the chisel, which further exacerbates the difficulty and risk of the disassembly operation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the problem that in the prior art, when a chisel is pressed against the edge of the sealing ring and the force is concentrated on the local edge of the sealing ring, the impact force generated by the hammering can easily cause the chisel to slip or deflect, and it is very easy to hit and damage the inner wall of the connecting cavity of the short shaft, the spline mating part and the clutch itself during the hammering process, resulting in the damage and scrapping of originally reusable parts, the present invention provides a disassembly device for the short shaft and the clutch in a mid-drive motor.

[0006] The technical solution adopted by this invention to solve its technical problem is: a device for disassembling the internal short shaft and clutch of a mid-mounted motor. The short shaft has a connecting cavity; The upper part of the inner wall of the connecting cavity has a mating part that matches the spline, and the lower part of the inner wall of the connecting cavity has a transition groove and a mounting groove. The mounting groove is located at the bottom of the short shaft, the transition groove is located above the mounting groove, and the clutch is arranged in the mounting groove. The mounting slot is provided with a sealing ring. The clutch includes a cage and several wedges arranged in the cage. The side of the wedge protruding from the inner wall of the cage is its inner side. There is a gap between the part of the wedge protruding from the inner wall of the cage and the sealing ring. The disassembly device includes a base, a pressure head, and several pressure blocks; The base has a material discharge cavity in the middle, and a receiving cavity for placing the short shaft is provided on the base. The receiving cavity and the material discharge cavity are connected. The pressure head and the pressure block are slidably connected, and the pressure block can extend into the gap between the clutch and the sealing ring; The pressure head is located in the connecting cavity of the short shaft. It extends into the gap between the clutch and the sealing ring through the pressure block. The pressure head and the push rod work together to evenly transmit the striking force to the sealing ring, which realizes the smooth detachment of the sealing ring. This avoids the deflection and slippage problems caused by localized force in the traditional chisel striking method, effectively protects the clutch and short shaft from damage, and improves the recycling rate of parts.

[0007] To address the issue of the sealing ring not easily separating from the clutch after falling off, requiring an additional process to remove the sealing ring and resulting in cumbersome operation, further measures were taken, including ensuring that the diameter of the material discharge cavity is larger than the diameter of the installation groove.

[0008] To address the issue that different tools are needed for the extension operation of the pressure block and the striking positioning of the sealing ring, the disassembly device further includes a push rod. The push rod includes a rod head and a rod body connected to the rod head. The diameter of the rod head is larger than the diameter of the rod body. The rod head can drive the pressing part of the pressure block to extend into the gap. The pressure head has a through hole extending along its axis, the diameter of which matches the rod body, and the through hole is used for the rod body to extend into. A positioning groove is provided on the end of the through hole near the pressure block, which is used for placing the rod head.

[0009] To address the problem of lack of guidance and difficulty in controlling the direction of movement when the pressure block slides within the pressure head, thus affecting the accurate alignment of the holding part and the gap, a further improvement is made by providing a sliding cavity extending radially along the pressure head on the side wall of the positioning groove, which is used for placing the pressure block.

[0010] To address the issue of damage to the spline mating portion when the pressure head is inserted into the connecting cavity, a limiting portion is further included on the outer periphery of the pressure head, with the diameter of the limiting portion being equal to the diameter of the transition groove. The diameter of the pressure head is smaller than the inner diameter of the mating part.

[0011] To address the issue of the pressure block's end being unable to smoothly extend into the narrow gap between the clutch and the sealing ring, the design further includes a pressure-holding portion protruding from the side of the pressure block near the clutch, capable of extending into the gap. To address the issue of the pressure block easily getting stuck when the lever head pushes against it, the design further includes an arc-shaped structure at the top and bottom corners of the pressure block on the side furthest from the clutch.

[0012] To address the issue that the pressure block may retract due to vibration or gravity after the push rod is removed, causing the holding part to come out of the gap and affecting subsequent striking operations, the disassembly device further includes a locking component. The locking component is threadedly connected to the pressure head, and the locking component can hold the pressure block in place. The pressure head has a threaded hole that communicates with the sliding cavity. The threaded hole matches the locking element, which is installed inside the threaded hole.

[0013] The beneficial effects of this invention are as follows: This invention provides a disassembly device for the short shaft and clutch inside a mid-mounted motor. By inserting a pressure block into the gap between the clutch and the sealing ring, and utilizing the cooperation of the pressure head and the push rod, the striking force is evenly transmitted to the sealing ring, achieving a smooth detachment of the sealing ring. This avoids the problems of deflection and slippage caused by localized force in the traditional chisel striking method, effectively protecting the clutch and short shaft from damage and improving the recycling rate of parts. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is the present invention. Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 This is the present invention. Figure 3 Enlarged structural diagram at point B; Figure 5 This is the present invention. Figure 3 A cross-sectional view of the rod head located in the positioning groove in the current state; Figure 6 This is a three-dimensional structural schematic diagram of the disassembly device of the present invention; Figure 7 This is a front view schematic diagram of the disassembly device of the present invention; Figure 8 This is the present invention. Figure 7 A schematic diagram of the cross-sectional structure at the CC section; Figure 9 This is a three-dimensional structural diagram of the present invention with the short shaft placed inside the base; Figure 10This is a three-dimensional structural schematic diagram of the present invention with the short axis placed inside the base from another perspective; Figure 11 This is a front view schematic diagram of the short shaft of the present invention placed on the base; Figure 12 This is the present invention. Figure 11 Schematic diagram of the cross-sectional structure at point DD; Figure 13 This is a three-dimensional structural schematic diagram of another embodiment of the present invention; Figure 14 This is the present invention. Figure 4 A schematic diagram of the structure of another embodiment under the condition.

[0016] In the diagram: 1. Short shaft, 11. Connecting cavity, 12. Butt joint, 13. Transition groove, 14. Mounting groove; 2. Clutch; 21. Cage; 22. Wedge; 3. Sealing ring; 31. Gap; 4. Base; 41. Material discharge cavity; 42. Receiving cavity; 5. Pressure head; 51. Through hole; 52. Positioning groove; 53. Sliding cavity; 54. Limiting part; 55. Threaded hole; 6. Pressing block; 61. Pressing and holding part; 7. Top post; 71. Club head; 72. Club shaft; 8. Locking components. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0018] like Figure 1 This is a schematic diagram of the structure of the present invention, showing a device for disassembling the internal short shaft and clutch of a mid-mounted motor. like Figure 3 , 12 As shown, the short shaft 1 has a connecting cavity 11; The upper part of the inner wall of the connecting cavity 11 has a mating part 12 that matches the spline, and the lower part of the inner wall of the connecting cavity 11 has a transition groove 13 and a mounting groove 14. The mounting groove 14 is located at the bottom of the short shaft 1, the transition groove 13 is located above the mounting groove 14, and the clutch 2 is arranged in the mounting groove 14. The groove of the mounting slot 14 is provided with a sealing ring 3. The clutch 2 includes a retainer 21 and a number of wedges 22 arranged in the retainer 21. The side of the wedge 22 that protrudes from the inner wall of the retainer 21 is its inner side. There is a gap 31 between the part of the wedge 22 that protrudes from the inner wall of the retainer 21 and the sealing ring 3. like Figure 3 , 4As shown in Figures 5 and 8, the disassembly device includes a base 4, a pressure head 5, and several pressure blocks 6. The base 4 has a material discharge cavity 41 in the middle and a receiving cavity 42 for placing the short shaft 1 on the base 4. The receiving cavity 42 is connected to the material discharge cavity 41. The base 4 can support the short shaft 1 and the receiving cavity 42 is matched with the short shaft 1. The pressure head 5 and the pressure block 6 are slidably connected, and the pressure block 6 can extend into the gap 31 between the clutch 2 and the sealing ring 3; The pressure head 5 is arranged in the connecting cavity 11 of the short shaft 1. It extends into the gap 31 between the clutch 2 and the sealing ring 3 through the pressure block 6. The pressure head 5 transmits the impact force to the sealing ring 3, so that the sealing ring 3 is evenly stressed and falls off smoothly, avoiding the skew damage caused by local impact and protecting the integrity of the clutch 2 and the short shaft 1.

[0019] like Figure 3 , 4 As shown in Figures 5 and 8, the diameter of the material discharge cavity 41 is larger than the diameter of the mounting groove 14, so that the detached sealing ring 3 can fall smoothly into the material discharge cavity 41, while the clutch 2 is blocked above the material discharge cavity 41, realizing the automatic separation of the sealing ring 3 and the clutch 2, which simplifies the operation process.

[0020] like Figure 3 , 4 As shown in Figures 5 and 8, the disassembly device also includes a push rod 7. The push rod 7 includes a rod head 71 and a rod body 72 connected to the rod head 71. The diameter of the rod head 71 is larger than the diameter of the rod body 72. The rod head 71 can drive the pressing part 61 of the pressure block 6 to extend into the gap 31. The corner of the rod head 71 has a chamfer, and the pressure block 6 has a chamfer that matches the rod head 71. The chamfer of the rod head 71 and the chamfer on the pressure block 6 are rounded. The pressure head 5 has a through hole 51 extending along its axial direction. The diameter of the through hole 51 matches that of the rod body 72. The through hole 51 is used for the rod body 72 to extend into it. A positioning groove 52 is provided on one end of the through hole 51 near the pressure block 6. The positioning groove 52 is used to place the rod head 71. The rod head 71 of the push rod 7 can drive the pressure block 6 to extend. The rod body 72 can be inserted into the through hole 51 to provide positioning for striking the sealing ring 3. The rod has multiple uses, which simplifies the tool structure, makes the operation smooth and convenient, and improves the disassembly efficiency.

[0021] like Figure 3 , 4 As shown in Figures 5 and 8, a sliding cavity 53 extending radially along the pressure head 5 is provided on the side wall of the positioning groove 52. The sliding cavity 53 is used for placing the pressure block 6 and provides radial sliding guidance for the pressure block 6, ensuring that the pressure block 6 accurately extends into the gap 31 in the set direction, thereby improving the accuracy of alignment and the reliability of operation.

[0022] A limiting part 54 protrudes from the outer periphery of the pressure head 5, and the diameter of the limiting part 54 is equal to the diameter of the transition groove 13. The diameter of the pressure head 5 is smaller than the inner diameter of the mating part 12. The cooperation between the limiting part 54 and the transition groove 13 limits the insertion depth of the pressure head 5, ensuring that the pressure head 5 will not touch the spline mating part 12 after it is placed in place, thus effectively protecting the spline structure of the short shaft 1.

[0023] The pressure block 6 protrudes from the side near the clutch 2 and forms a pressing part 61 that can extend into the gap 31. The protruding pressing part 61 can be adapted to the size of the gap 31, ensuring that the pressure block 6 can smoothly extend into the gap 31, providing a basis for the uniform force and subsequent detachment of the sealing ring 3.

[0024] like Figure 3 , 4 As shown in Figures 5 and 8, the top and bottom corners of the pressure block 6 on the side away from the clutch 2 are arc-shaped. The arc-shaped structure reduces the frictional resistance when the pressure block 6 slides, making the radial movement of the pressure block 6 smoother, and at the same time avoiding scratches on the inner wall of the connecting cavity 11 of the short shaft 1 during the movement of the pressure block 6.

[0025] The disassembly device also includes a locking element 8, which is threadedly connected to the pressure head 5, and the locking element 8 can abut against the pressure block 6; The pressure head 5 has a threaded hole 55 that communicates with the sliding cavity 53. The threaded hole 55 matches the locking member 8. The locking member 8 is installed in the threaded hole 55. The locking member 8 reliably locks the pressure block 6 in the state where the pressure holding part 61 extends into the gap 31, ensuring that the position of the pressure block 6 remains stable during the removal of the top rod 7 and subsequent flipping and knocking, thus ensuring the reliability of the disassembly operation.

[0026] The pressure block 6 has chamfered top and bottom corners on the side away from the clutch 2, and the rod head 71 has chamfered top corner.

[0027] In another embodiment, such as Figure 13 As shown, the chamfer on the rod head 71 is a right angle so that there is enough pushing distance after the pressure block 6 and the rod head 71 come into contact, so that the pressing part 61 can enter the gap 31.

[0028] In another embodiment, such as Figure 14 As shown, the lower chamfer on the side of the pressure block 6 near the center of the pressure head 5 is a right angle, so that there is enough pushing distance after the pressure block 6 and the rod head 71 come into contact, so that the holding part 61 can enter the gap 31.

[0029] When only one chamfer of the rod head 71 and the pressure block 6 is a right angle, a larger tilt angle needs to be designed compared to when both are rounded.

[0030] Working process: The short shaft 1, which contains the clutch 2 and sealing ring 3, is placed upside down so that the mounting groove 14 of the short shaft 1 faces upward. The pressure head 5 is inserted from top to bottom into the connecting cavity 11 of the short shaft 1, and the pressure head 5 is moved downward along the connecting cavity 11 until the pressure head 5 reaches the placement surface of the short shaft 1. At this time, the limiting part 54 protruding from the outer periphery of the pressure head 5 is exactly located in the transition groove 13 in the connecting cavity 11. The diameter of the limiting part 54 is equal to the diameter of the transition groove 13. The two cooperate to limit the position of the pressure head 5, effectively preventing the pressure head 5 from extending further downward and touching the spline mating part 12 at the top of the connecting cavity 11 during subsequent operations.

[0031] Insert the rod head 71 of the push rod 7 into the positioning groove 52 at the end of the pressure head 5, so that the rod head 71 contacts the pressure block 6 arranged in the sliding cavity 53. Continue to push the push rod 7, so that the rod head 71 drives the pressure block 6 to move outward along the sliding cavity 53, that is, along the radial direction of the pressure head 5, until the pressure holding part 61 protruding near the clutch 2 extends into the gap 31 between the protruding part of the wedge block 22 of the clutch 2 and the sealing ring 3. At this time, install the locking member 8 into the threaded hole 55 on the pressure head 5 and tighten it so that the end of the locking member 8 abuts against the pressure block 6, thereby keeping the pressure block 6 in the state where the pressure holding part 61 extends into the gap 31. After locking is completed, remove the push rod 7.

[0032] The short shaft 1 equipped with the pressure head 5 is picked up and inverted so that the mounting groove 14 of the short shaft 1 faces downward. Then, the short shaft 1 is placed in the receiving cavity 42 of the base 4, and the outer wall of the short shaft 1 is positioned in conjunction with the receiving cavity 42. At this time, the material discharge cavity 41 in the middle of the base 4 is located directly below the mounting groove 14 of the short shaft 1, and the diameter of the material discharge cavity 41 is larger than the diameter of the mounting groove 14.

[0033] Insert the rod 72 of the push rod 7 into the through hole 51 of the pressure head 5 from top to bottom, so that the rod 72 extends downward along the through hole 51 until the rod head 71 at the end of the rod 72 contacts the top surface of the pressure head 5.

[0034] The operator holds a hammer and applies an impact load to the head 71 of the push rod 7. The impact kinetic energy generated by the hammer is instantly converted into impact force, which propagates downward along the axial direction of the head 71. Since the bottom surface of the head 71 is in contact with the top surface of the pressure head 5, the impact force is transmitted to the pressure head 5. The impact force moves downward along the pressure head 5. Since the vertical movement of the pressure block 6 is restricted within the sliding cavity 53, the force is transmitted to the pressure block 6. The holding part 61 of the pressure block 6 is in a state of extending into the gap 31. Because the contact force between the holding part 61 and the sealing ring 3 is transmitted to the sealing ring 3, the downward axial impact force on the sealing ring 3 overcomes the static friction and clamping force between the sealing ring 3 and the groove of the mounting groove 14. Due to the instantaneous high amplitude of the impact force, the sealing ring 3 obtains a large downward acceleration in a very short time. Under the combined action of inertial force and impact force, the sealing ring 3 is displaced downward along the axial direction, thereby disengaging from the groove of the mounting groove 14.

[0035] The detached sealing ring 3 falls into the material discharge cavity 41 of the base 4 under the action of gravity, thereby realizing the separation of the sealing ring 3 from the clutch 2.

[0036] After the sealing ring 3 falls off, the short shaft 1 is removed from the accommodating cavity 42. Since the sealing ring 3 has fallen off, the groove of the mounting groove 14 is open, and the clutch 2 can be easily removed from the mounting groove 14, completing the entire disassembly process.

[0037] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for disassembling the internal short shaft and clutch of a mid-mounted motor, characterized in that, The short shaft (1) has a connecting cavity (11); The upper part of the inner wall of the connecting cavity (11) has a mating part (12) that matches the spline. The lower part of the inner wall of the connecting cavity (11) is provided with a transition groove (13) and a mounting groove (14). The mounting groove (14) is located at the bottom of the short shaft (1). The transition groove (13) is located above the mounting groove (14). The clutch (2) is arranged in the mounting groove (14). The mounting groove (14) has a sealing ring (3) arranged in the groove. The clutch (2) includes a retainer (21) and a plurality of wedges (22) arranged in the retainer (21). The wedges (22) protrude from the inner wall of the retainer (21) on one side as their inner side. There is a gap (31) between the wedges (22) protruding from the inner wall of the retainer (21) and the sealing ring (3). The disassembly device includes a base (4), a pressure head (5), and several pressure blocks (6); The base (4) has a material discharge cavity (41) in the middle, and the base (4) has a receiving cavity (42) for placing the short shaft (1). The receiving cavity (42) and the material discharge cavity (41) are connected. The pressure head (5) and the pressure block (6) are slidably connected, and the pressure block (6) can extend into the gap (31) between the clutch (2) and the sealing ring (3); The pressure head (5) is arranged in the connecting cavity (11) of the short shaft (1).

2. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 1, characterized in that: The diameter of the material discharge cavity (41) is larger than the diameter of the mounting groove (14).

3. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 1, characterized in that: The disassembly device also includes a push rod (7), which includes a rod head (71) and a rod body (72) connected to the rod head (71). The diameter of the rod head (71) is larger than the diameter of the rod body (72). The rod head (71) can drive the pressure block (6) to extend into the gap (31). The pressure head (5) has a through hole (51) extending along its axial direction. The diameter of the through hole (51) matches that of the rod body (72). The through hole (51) is used for the rod body (72) to extend into it. The through hole (51) has a positioning groove (52) on one end near the pressure block (6), and the positioning groove (52) is used for placing the rod head (71).

4. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 3, characterized in that: The positioning groove (52) has a sliding cavity (53) extending radially along the pressure head (5) on its side wall. The sliding cavity (53) is used to place the pressure block (6).

5. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 1, characterized in that: The pressure head (5) has a protruding limiting part (54) on its outer periphery, and the diameter of the limiting part (54) is equal to the diameter of the transition groove (13). The diameter of the pressure head (5) is smaller than the inner diameter of the docking part (12).

6. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 1, characterized in that: The pressure block (6) protrudes from the side near the clutch (2) and has a pressure holding part (61) that can extend into the gap (31).

7. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 3, characterized in that: The pressure block (6) has chamfered top and bottom corners on the side away from the clutch (2), and the rod head (71) has chamfered top corner.

8. The disassembly device for the internal short shaft and clutch of a mid-mounted motor as described in claim 4, characterized in that: The disassembly device also includes a locking element (8), which is threadedly connected to the pressure head (5), and the locking element (8) can abut against the pressure block (6). The pressure head (5) has a threaded hole (55) that communicates with the sliding cavity (53). The threaded hole (55) matches the locking member (8), and the locking member (8) is installed in the threaded hole (55).

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