Assembly tool for preventing motor belt pulley from being damaged by collision

Abstract

The utility model discloses an assembly tool for preventing a motor belt pulley from being bumped, which comprises a workbench, a positioning ring, a tray and a buffer block, the workbench is provided with a first through hole, the positioning ring is fixed with the workbench and surrounds the first through hole, the tray is matched with the positioning ring, the tray is provided with a second through hole for the belt pulley to penetrate through, and the buffer block is arranged in the second through hole. The tray is provided with a plurality of radial protrusions located on the inner wall of the second through hole and used for supporting the front end cover of the motor, an assembly groove is formed between every two adjacent radial protrusions, the buffer blocks are matched with the assembly grooves, and the radius of the buffer blocks is smaller than that of the radial protrusions. In the process that the belt pulley penetrates through or retreats from the positioning ring, the belt pulley can be prevented from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of motor assembly, specifically to an assembly fixture that prevents motor pulleys from being damaged. Background Technology

[0002] The car alternator is the main power source for a car. Its function is to supply power to all electrical equipment (except the starter motor) and charge the battery while the engine is running normally.

[0003] Alternators are typically equipped with pulleys. The alternator is connected to the engine crankshaft via a belt. After the engine starts, the alternator drives the rotor to rotate via the belt, thereby generating electricity. The pulley is fixed to the rotor shaft of the alternator as a single unit. Alternatively, the pulley and rotor shaft are usually manufactured separately. During installation, the pulley is fitted onto the rotor shaft and fitted into it. A nut is then threaded onto the rotor shaft to prevent axial movement of the pulley.

[0004] Typically, the alternator's rotor shaft is passed through a workbench equipped with a locating ring. Because the outer diameter of the pulleys on most products is relatively large, the largest inner diameter of the locating ring is Φ78, leaving only a 2mm gap between it and the pulley, with a 1mm gap on each side. Before tightening the pulley to the rotor shaft, the pulley is pre-installed on the rotor shaft. Therefore, the pulley and rotor shaft need to pass through the locating ring. The front cover of the alternator is supported on the locating ring. After the pulley and rotor shaft are tightened, when removing the alternator from the workbench, the pulley needs to be removed from the tray. Both the placement and removal of the alternator are done manually. During manual placement or removal, the pulley and locating ring are prone to collision, causing scratches and exposing the bottom layer of the pulley. This can lead to rust during use, resulting in rework and repairs. Extensive rework and repairs also easily result in defective products being released. Summary of the Invention

[0005] This invention provides an assembly fixture to prevent motor pulleys from being damaged. During the process of passing the pulley through or out of the positioning ring, this invention can prevent the pulley from being damaged.

[0006] The technical solutions to the above problems are as follows:

[0007] An assembly fixture for preventing damage to the motor pulley includes a worktable and a positioning ring. The worktable has a first through hole, and the positioning ring is fixed to the worktable and surrounds the first through hole. The fixture also includes a tray and a buffer block. The tray cooperates with the positioning ring and has a second through hole for the pulley to pass through. The tray has multiple radial protrusions located on the inner wall of the second through hole for supporting the front end cover of the motor. An assembly groove is formed between two adjacent radial protrusions. The buffer block cooperates with the assembly groove, and the radius of the buffer block is smaller than the radius of the radial protrusions.

[0008] Furthermore, the tray is also provided with a support plate for supporting the buffer block, at least a portion of the support plate is located in the assembly groove, and the support plate is fixed to the inner wall of the second through hole and / or the radially protruding side wall.

[0009] Furthermore, the buffer block has an axial protrusion on its axial end face, and the support plate has a notch. The axial protrusion extends beyond the axial end face of the tray after passing through the notch.

[0010] Furthermore, the difference between the radius of the radial protrusion and the radius of the buffer block is at least 1 mm.

[0011] Furthermore, it also includes a first component for positioning and supporting the rear end cover of the motor. The first component includes a first support, a first plug-in component, and a first positioning pin. The first support is fixed to the worktable. A plurality of the first plug-in components are provided on the circumferential surface of the first support. The first plug-in component is provided with a first plug hole. One end of the first positioning pin is plugged into the first plug hole, and the other end of the first positioning pin is used to plug into the rear end cover of the motor.

[0012] Furthermore, it also includes a second component for positioning and supporting the motor cover. The second component includes a second support, a positioning post, and an elastic component. The second support is fixed to the worktable, and the positioning post is fixed to the second support. The second support is provided with multiple stepped holes around the positioning post, and an elastic component is installed in each stepped hole.

[0013] Furthermore, the elastic component includes a spring, a sleeve, and a second locating pin. One end of the sleeve is clearance-fitted with the stepped hole, the spring is located inside the sleeve, and one end of the spring is fit with the step of the stepped hole. One end of the second locating pin is located inside the sleeve, and the other end of the second locating pin is located outside the sleeve. A boss is provided on the circumferential surface of the second locating pin, and the spring is sleeved on the second locating pin, with the other end of the spring fitting with the boss.

[0014] In this invention, since the inner diameter of the second through hole is smaller than that of the first through hole and the inner diameter of the positioning ring, and the radius of the buffer block is smaller than that of the radial protrusion, if the pulley is accidentally collided with the product when the product is taken off the pallet or passed through the pallet, the pulley will only collide with the buffer block first. Since the hardness of the buffer block is much lower than that of the pulley, the buffer block can prevent the pulley from being damaged by hard collision. Attached Figure Description

[0015] Figure 1 A schematic diagram of the assembly tooling used to prevent damage to the motor pulley and the assembled motor.

[0016] Figure 2 Assembly fixtures to prevent damage to the motor pulley and a top view of the assembled motor.

[0017] Figure 3 For along Figure 1 Cross-sectional view of line AA in the middle.

[0018] Figure 4 For along Figure 1 Cross-sectional view of the middle BB line.

[0019] Figure 5 This is a 3D view of the tray.

[0020] Figure 6 This is a 3D view of the buffer block.

[0021] Labels in the attached diagram:

[0022] Workbench 1, first through hole 1a, spacer 2, tray 3, second through hole 3a, radial protrusion 3b, assembly groove 3c, support plate 3d, notch 3e, buffer block 4, axial protrusion 4a, first support 5, first plug-in component 6, first positioning pin 7, second support 8, positioning post 9, spring 10, sleeve 11, second positioning pin 12, boss 12a, third support 13, third support rod 14, fourth support 15, spindle 16, flange 17, hollow tube 18, fifth support 19, shaft 20, pulley A, motor front end cover B, motor rear end cover C, motor cover D, insulating sleeve E, wave washer F. Detailed Implementation

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on the drawings without creative effort, and these embodiments are still within the protection scope of the claims of this utility model.

[0024] like Figures 1 to 6 The assembly fixture for preventing damage to motor pulleys according to this utility model includes a worktable 1, a spacer 2, a tray 3, and a buffer block 4. The worktable 1 is provided with a first through hole 1a. The spacer 2 is fixed to the worktable 1 and surrounds the first through hole 1a. The inner diameter of the spacer 2 is equal to the inner diameter of the first through hole 1a, or the inner diameter of the spacer 2 is greater than the inner diameter of the first through hole 1a.

[0025] The tray 3 mates with the spacer 2. The tray 3 has a second through hole 3a through which the pulley A passes. The inner diameter of the second through hole 3a is smaller than that of the first through hole 1a and the inner diameter of the spacer 2. The tray 3 has multiple radial protrusions 3b located on the inner wall of the second through hole 3a for supporting the front cover B of the motor. An assembly groove 3c is formed between two adjacent radial protrusions 3b. The buffer block 4 mates with the assembly groove 3c. The buffer block 4 can be made of resin, nylon, etc. The center of the buffer block 4 is the same as the center of the radial protrusion 3b. The radius of the buffer block 4 is smaller than that of the radial protrusion 3b. The difference between the radius of the radial protrusion 3b and the buffer block 4 is at least 1 mm. For example, the radius of the buffer block 4 is 38.5 mm, the inner diameter of the radial protrusion 3b is 39.5 mm, and the difference between the radius of the radial protrusion 3b and the buffer block 4 is 1 mm.

[0026] In this invention, since the inner diameter of the second through hole 3a is smaller than that of the first through hole 1a and the inner diameter of the spacer 2, and the radius of the buffer block 4 is smaller than that of the radial protrusion 3b, if the pulley A is accidentally collided with the product by the manual removal of the product from the tray 3 or the product passing through the tray 3, the pulley A will only collide with the buffer block 4 first. Since the hardness of the buffer block 4 is much lower than that of the pulley A, the buffer block 4 can prevent the pulley A from being damaged by hard collision.

[0027] The tray 3 is also provided with a support plate 3d for supporting the buffer block 4. At least a portion of the support plate 3d is located in the assembly groove 3c, and the support plate 3d is fixed to the inner wall of the second through hole 3a and / or the side wall of the radial protrusion 3b. By supporting the buffer block 4 with the support plate 3d, the buffer block 4 can be prevented from falling off.

[0028] The buffer block 4 has an axial protrusion 4a on its axial end face, and the support plate 3d has a notch 3e. The axial protrusion 4a extends beyond the axial end face of the tray 3 after passing through the notch 3e. For example, the buffer block 4 has an axial protrusion 4a on its lower side, which extends below the axial end face of the tray 3, thereby further preventing the pulley A from colliding with the metal parts on the assembly fixture.

[0029] When fixing pulley A to the rotor shaft, the rotor shaft must not rotate. Therefore, the rear end cover C of the motor cannot be combined and fixed with the front end cover B of the motor. A clamping device is used to clamp the rotor. After the pulley A and the rotor shaft are assembled, the rear end cover C of the motor needs to be fixed with the front end cover B of the motor, and the motor cover D needs to be fixed with the rear end cover C of the motor. To facilitate assembly, this utility model also includes a first component for positioning and supporting the rear end cover C of the motor. The first component is located at the first corner of the workbench 1. The first component includes a first support 5, a first insertion component 6, and a first positioning pin 7. The first support 5 is fixed to the workbench 1. Multiple first insertion components 6 are provided on the circumferential surface of the first support 5. The first insertion component 6 is provided with a first insertion hole 6a. One end of the first positioning pin 7 is inserted into the first insertion hole 6a, and the other end of the first positioning pin 7 is used to insert into the rear end cover C of the motor.

[0030] The rear end cover C of the motor is placed on the first support 5 in advance, and the rear end cover C of the motor is inserted into the first positioning pin 7 to prevent the rear end cover C of the motor from separating from the first component. After the pulley A and the rotor shaft are assembled, the rear end cover C of the motor is directly removed from the first component and fixed to the front end cover B of the motor, which is both convenient and improves the assembly efficiency.

[0031] Based on the above, the present invention also includes a second component for positioning and supporting the motor cover D. The first component is located at the second corner of the workbench 1. The second component includes a second support 8, a positioning post 9, and an elastic component. The second support 8 is fixed to the workbench 1, and the positioning post 9 is fixed to the second support 8. The second support 8 is provided with a plurality of stepped holes around the positioning post 9, and an elastic component is installed in each stepped hole.

[0032] The elastic component includes a spring 10, a sleeve 11, and a second positioning pin 12. One end of the sleeve 11 is clearance-fitted with a stepped hole. The spring 10 is located inside the sleeve 11, and one end of the spring 10 is fit with the step of the stepped hole. One end of the second positioning pin 12 is located inside the sleeve 11, and the other end of the second positioning pin 12 is located outside the sleeve 11. A boss 12a is provided on the circumferential surface of the second positioning pin 12. The spring 10 is fitted onto the second positioning pin 12, and the other end of the spring 10 is fitted with the boss 12a.

[0033] When the motor cover D is placed on the second component, the middle part of the motor cover D engages with the positioning post 9, the positioning post 9 supports the motor cover D, and the inner wall of the motor cover D also engages with the second positioning pin 12. The second positioning pin 12 compresses the spring 10, and the inner wall of the motor cover D is supported by multiple elastic components, thereby preventing the motor cover D from rotating relative to the second component.

[0034] This utility model also includes a third component for positioning and supporting the insulating sleeve E. The third component includes a third support 13 and a third support rod 14. The third support 13 is fixed to the workbench 1, and the third support rod 14 is fixed to the third support 13. In use, the insulating sleeve E is put on the third support rod 14. In assembly, the insulating sleeve E can be removed from the third component.

[0035] This utility model also includes a fourth component for positioning and supporting pulley A. The fourth component is located at the triangular portion of the worktable 1, and the third component is located between the second and fourth components. The fourth component includes a fourth support 15 and a spindle 16. The fourth support 15 is fixed to the worktable 1, one end of the spindle 16 is fixed to the fourth support 15, and the other end of the spindle 16 is a free end. In use, pulley A is fitted onto the spindle 16, and the axial end face of pulley A mates with the axial end face of the fourth support 15.

[0036] This invention also includes a fifth component for positioning and supporting the rotor assembly. The fifth component is located at the fourth corner of the workbench 1 and includes a flange 17 and a hollow tube 18. The flange 17 is fixed to the workbench 1, one end of the hollow tube 18 is fixed to the flange 17, and the other end of the hollow tube 18 is a free end. In use, the rotor shaft is fitted with the hollow tube 18, and the flange 17 provides support for the rotor body.

[0037] This invention also includes a sixth component for supporting the waveform washer F. The sixth component is located between the first and fourth components. The sixth component includes a fifth support 19 and a shaft 20. The fifth support 19 is fixed to the worktable 1, one end of the shaft 20 is fixed to the fifth support 19, and the other end of the shaft 20 is a free end. In use, the waveform washer F is placed on the shaft 20, and the fifth support 19 provides support for the waveform washer F.

Claims

1. An assembly fixture for preventing damage to a motor pulley, comprising a worktable (1) and a spacer (2), wherein the worktable (1) has a first through hole (1a), and the spacer (2) is fixed to the worktable (1) and surrounds the first through hole (1a), characterized in that, It also includes a tray (3) and a buffer block (4). The tray (3) cooperates with the spacer (2). The tray (3) has a second through hole (3a) through which the pulley (A) passes. The tray (3) has multiple radial protrusions (3b) located on the inner wall of the second through hole (3a) and used to support the front end cover (B) of the motor. An assembly groove (3c) is formed between two adjacent radial protrusions (3b). The buffer block (4) cooperates with the assembly groove (3c). The radius of the buffer block (4) is smaller than the radius of the radial protrusions (3b).

2. The assembly fixture for preventing damage to the motor pulley according to claim 1, characterized in that, The tray (3) is also provided with a support plate (3d) for supporting the buffer block (4). At least a portion of the support plate (3d) is located in the assembly groove (3c). The support plate (3d) is fixed to the inner wall of the second through hole (3a) and / or the side wall of the radial protrusion (3b).

3. The assembly fixture for preventing damage to the motor pulley according to claim 2, characterized in that, The buffer block (4) has an axial protrusion (4a) on its axial end face, and the support plate (3d) has a notch (3e). The axial protrusion (4a) extends beyond the axial end face of the tray (3) after passing through the notch (3e).

4. The assembly fixture for preventing damage to the motor pulley according to claim 1, characterized in that, The difference in radius between the radial protrusion (3b) and the buffer block (4) is at least 1 mm.

5. The assembly fixture for preventing damage to the motor pulley according to claim 1, characterized in that, It also includes a first component for positioning and supporting the rear end cover (C) of the motor. The first component includes a first support (5), a first plug-in component (6), and a first positioning pin (7). The first support (5) is fixed to the worktable (1). Multiple first plug-in components (6) are provided on the circumferential surface of the first support (5). The first plug-in component (6) is provided with a first plug hole (6a). One end of the first positioning pin (7) is plugged into the first plug hole (6a), and the other end of the first positioning pin (7) is used to plug into the rear end cover (C) of the motor.

6. The assembly fixture for preventing damage to the motor pulley according to claim 1, characterized in that, It also includes a second component for positioning and supporting the motor cover (D), the second component including a second support (8), a positioning post (9) and an elastic component, the second support (8) being fixed to the worktable (1), the positioning post (9) being fixed to the second support (8), the second support (8) having a plurality of stepped holes around the positioning post (9), and an elastic component installed in each stepped hole.

7. The assembly fixture for preventing damage to the motor pulley according to claim 6, characterized in that, The elastic component includes a spring (10), a sleeve (11), and a second positioning pin (12). One end of the sleeve (11) is in clearance fit with the stepped hole. The spring (10) is located inside the sleeve (11) and one end of the spring (10) is in step fit with the step of the stepped hole. One end of the second positioning pin (12) is located inside the sleeve (11) and the other end of the second positioning pin (12) is located outside the sleeve (11). A boss (12a) is provided on the circumferential surface of the second positioning pin (12). The spring (10) is fitted on the second positioning pin (12) and the other end of the spring (10) is in fit with the boss (12a).

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