CN219678284U

CN219678284U - Tool assembly

Info

Publication number: CN219678284U
Application number: CN202320314156.1U
Authority: CN
Inventors: 郭凯峰; 李建青
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-09-12
Anticipated expiration: 2033-02-24

Abstract

The utility model relates to a tool assembly, which comprises a motor, a commutator connected to the motor and a pressing device for connecting the commutator to the motor, wherein the motor comprises a motor shaft extending along the axial direction and an iron core fixedly connected to the motor shaft, the commutator is connected to the motor shaft, and the iron core, the commutator and the pressing device are sequentially arranged along the axial direction; the commutator is provided with a positioning groove positioned at one side facing the pressing device, the pressing device is provided with a positioning block matched with the positioning groove, and the positioning block is accommodated in the positioning groove so as to fix the commutator relative to the iron core along the axial interval. According to the utility model, the positioning block of the pressing device is matched with the positioning groove of the commutator to limit the rotation of the commutator, so that the pressing device can push the commutator to move from the first position to the second position in the axial direction without rotation, and the rotor is prevented from being changed by deflection caused by traction rotation of the winding wire during the process of fixing the commutator to the second position, thereby influencing the overall performance of the motor.

Description

Tool assembly

[ field of technology ]

The utility model relates to a tool assembly, in particular to a tool assembly for positioning a commutator during pressing.

[ background Art ]

The existing processing technology of the single-insulation series excited machine rotor comprises the following steps: firstly, fixing an iron core on a motor shaft, and pressing a commutator into the iron core at a certain distance, so that an iron core groove of at least one iron core is opposite to a commutation groove or a mica sheet of the commutator, wherein the process is generally called primary pressing of the commutator; and then winding, and then performing secondary pressing-in of the commutator, namely pressing the commutator to a final fixed position along a motor shaft, wherein the processing technology can obtain a relatively abundant winding space and does not influence the performance of the motor.

However, when the commutator is secondarily pressed in, the enameled wires wound between the iron cores have rotary pull force on the commutator and the iron cores, and when the rotary pull force is larger than the slip torque between the commutator and the motor shaft, the commutator slips relative to the iron core groove, so that deflection occurs between the commutator and the iron cores to influence the motor performance.

In view of the foregoing, it is desirable to provide an improved tooling assembly that overcomes the shortcomings of the prior art.

[ utility model ]

Aiming at the defects of the prior art, the utility model aims to provide a tooling assembly for positioning during pressing in of a commutator.

The utility model solves the problems in the prior art by adopting the following technical scheme: the tooling assembly comprises a motor, a commutator connected to the motor and a pressing device for connecting the commutator to the motor, wherein the motor comprises a motor shaft extending along the axial direction and an iron core fixedly connected to the motor shaft, the commutator is connected to the motor shaft, and the iron core, the commutator and the pressing device are sequentially arranged along the axial direction; the commutator is provided with a positioning groove positioned at one side facing the pressing device, the pressing device is provided with a positioning block matched with the positioning groove, and the positioning block is accommodated in the positioning groove so as to fix the commutator relative to the iron core along the axial interval.

The further improvement scheme is as follows: the commutator includes a sleeve portion fixed to the motor shaft, the positioning groove is configured as a circular groove recessed inward from an axial end face of the sleeve portion, and the positioning block is configured as a cylinder extending from the axial end face of the press-in device toward the sleeve portion.

The further improvement scheme is as follows: the commutator comprises a sleeve part fixed to the motor shaft and an annular part extending from the axial end face of the sleeve part towards the press-in device, and the positioning groove is formed by inwards sinking from the axial end face of the annular part.

The further improvement scheme is as follows: the commutator includes a first position unsecured to the core and a second position secured to the core, the commutator being at a greater axial spacing from the core when in the first position than the commutator is at the second position.

The further improvement scheme is as follows: the positioning grooves and the positioning blocks are at least two, and the positioning grooves and the positioning blocks are respectively and symmetrically arranged relative to the center of the motor shaft, so that the pressing device can push the commutator to move from the first position to the second position in the axial direction without rotation.

The further improvement scheme is as follows: the motor comprises a winding at least partially wound around the core, the winding being axially connected between the core and the commutator, the commutator being in a stretched state when in the first position and in a relaxed state when in the second position.

The further improvement scheme is as follows: the iron core is provided with a plurality of iron core grooves which are distributed at intervals, the commutator is provided with a plurality of reversing grooves which are distributed at intervals, and at least one iron core groove and the reversing grooves are aligned in the axial direction.

The further improvement scheme is as follows: the commutator and the iron core are fixed to the motor shaft in an interference fit mode.

The further improvement scheme is as follows: the tool assembly comprises a limiting device used for fixing the motor shaft, and the limiting device is arranged on one side, away from the axial direction of the commutator, of the iron core.

The further improvement scheme is as follows: the limiting device is provided with a boss for propping against one axial end of the motor shaft, the pressing device is provided with a containing groove for containing the other axial end of the motor shaft, and the motor shaft is non-rotatably fixed between the limiting device and the pressing device.

Compared with the prior art, the utility model has the following beneficial effects: the positioning block of the pressing device is matched with the positioning groove of the commutator to limit the rotation of the commutator, so that the pressing device can push the commutator to move from a first position to a second position in an axial direction without rotation, and the rotor is prevented from being changed by deflection caused by traction rotation of a winding wire during the process of fixing the commutator to the second position, thereby influencing the overall performance of the motor; in addition, the setting of the constant head tank of commutator can also discharge the unnecessary air of commutator in the shaping in-process to promote the performance of commutator.

[ description of the drawings ]

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings:

FIG. 1 is a schematic view of a tooling assembly according to a preferred embodiment of the present utility model, wherein the commutator is in a first position;

FIG. 2 is a schematic view of the assembly of FIG. 1 with the commutator in a second position;

FIG. 3 is a partial exploded view of the tooling assembly of FIG. 2;

FIG. 4 is a schematic view of the press-in device shown in FIG. 3 at another angle;

fig. 5 is a schematic view of the commutator shown in fig. 3.

Meaning of reference numerals in the drawings:

tool assembly 100 motor 10

Motor shaft 11 core 12

Core plate 121 core slot 122

Slot wedge 123 winding 13

Commutator 20 segments 21

Fixed leg 211 reversing groove 22

Annular portion 231 of sleeve portion 23

Positioning groove 24 press-fitting structure 30

Holding groove 311 of pressing device 31

Locating block 312 stop 32

Boss 321 attachment device 33

[ detailed description ] of the utility model

The utility model will be described in further detail with reference to the drawings and embodiments.

The terminology used in the present utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The words such as "upper", "lower", "front", "rear", "left", "right", etc., indicating an azimuth or a positional relationship are merely based on the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices/elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

Referring to fig. 1 and 2, an embodiment of the present utility model relates to a tooling assembly 100, which includes a motor 10, a commutator 20 connected to the motor 10, and a press-fit structure 30 for connecting the commutator 20 to the motor 10. The motor 10 includes a motor shaft 11 extending in an axial direction, a core 12 fixedly connected to the motor shaft 11, and a winding 13 at least partially wound to the core 12.

The press-fitting structure 30 includes a press-fitting device 31 for pushing the commutator 20 toward the motor 10 to connect the commutator 20 to the motor 10, a stopper 32 for fixing one end of the motor shaft 11 in the axial direction, and a connecting device 33 for connecting the stopper 32 and the press-fitting device 31. In the axial direction, the limiting device 32 is disposed on one side of the core 12 away from the commutator 20 in the axial direction, and the limiting device 32, the core 12, the commutator 20 and the press-in device 31 are sequentially arranged in the axial direction. The iron core 12 and the commutator 20 are connected to the motor shaft 11 at a certain distance, and the iron core 12 and the commutator 20 are fixed on the motor shaft 11 in an interference fit manner.

As shown in fig. 3 to 5, the limiting device 32 is provided with a boss 321 abutting against one axial end of the motor shaft 11, one end of the motor shaft 11 facing the boss 321 is provided with an axially recessed groove (not shown), and the boss 321 extends into the groove to enable the motor shaft 11 to be in non-rotatable abutting connection with the boss 321; the press-in device 31 is provided with a receiving groove 311 for receiving the other end of the motor shaft 11 in the axial direction, and the motor shaft 11 is non-rotatably fixed between the stopper 32 and the press-in device 31 by engagement of the boss 321 with the motor shaft 11.

The commutator 20 includes a cylindrical sleeve portion 23 fixed to the motor shaft 11, a plurality of commutator segments 21 at least partially spaced apart from the outer periphery of the sleeve portion 23, and a commutator slot 22 between two adjacent commutator segments 21. The sleeve portion 23 is provided with a central groove for accommodating the motor shaft 11. Each commutator segment 21 has one end near the core 12 extending in a radial direction perpendicular to the axial direction to form a fixing leg 211, and the fixing leg 211 is provided with an open slot (not shown) in which the winding 13 is fixed.

The core 12 includes a plurality of core segments 121 arranged at intervals, a plurality of core slots 122 between adjacent core segments 121, and a center slot (not shown) for accommodating the motor shaft 11. The diameters of the central groove of the commutator 20 and the central groove of the iron core 12 are slightly smaller than the dimension of the motor shaft 11 where the two are fixed, so that the iron core 12 and the commutator 20 are fixed on the motor shaft 11 in an interference fit mode.

The winding wire is partially wound around the core segment 121 and partially wound around the fixing leg 211 of the commutator segment 21 to constitute the winding 13 connected between the core 12 and the commutator 20. The number of commutation slots 22 and core slots may be the same or the number of commutation slots 22 may be twice as many as core slots 122 depending on the different performance requirements of the motor 10. Wherein at least one commutation slot 22 is disposed in axial alignment with the core slot 122.

The motor 10 further includes a plurality of slot wedges 123 secured within the core slots 122, the slot wedges 123 being configured in an elongated shape. Each slot wedge 123 is filled between two adjacent core segments 121 to cover between the core slot and the winding 13 to seal the core slot from the winding 13 being thrown away during high speed rotation of the rotor of the motor 10.

To facilitate winding of the winding wire, the commutator 20 includes a first position not secured to the core 12 and a second position secured to the core 12. The axial spacing of commutator 20 from core 12 is greater when in the first position than when commutator 20 is in the second position.

The commutator 20 further includes an annular portion 231 extending from an axial end surface of the sleeve portion 23 toward the press-fitting means 31, the annular portion 231 having an outer diameter smaller than that of the sleeve portion 23, thereby facilitating the discharge of surplus air from the outer periphery of the annular portion 231 during the molding of the commutator 20.

The commutator 20 is provided with at least two positioning grooves 24 positioned on one side facing the press-in device 31, and the positioning grooves 24 are formed by being recessed inwards from the axial end face of the annular part 231; the side of the pressing device 31 facing the commutator 20 is provided with a positioning block 312 matched with the positioning groove 24, and the positioning block 312 protrudes from the end surface of the pressing device 31 to be accommodated in the positioning groove 24 so as to fix the commutator 20 relative to the iron core 12 along the axial interval. In this embodiment, the positioning slots 24 and the positioning blocks 312 are arranged in two, and the positioning slots 24 and the positioning blocks 312 are respectively arranged in a central symmetry manner relative to the motor shaft 11.

In the present embodiment, the positioning groove 24 is provided on the annular portion 231, but in other embodiments, the annular portion 231 may not be provided, the positioning groove 24 may be formed by being recessed inward directly on the axial end surface of the sleeve portion 23, and the excessive air may be discharged through the positioning groove 24. In addition, the positioning groove 24 may be a circular groove in the present embodiment, or may be a groove with another shape; the positioning block 312 may be cylindrical in shape in the present embodiment or may be configured in other shapes corresponding to the positioning groove 24.

As shown in fig. 1, the commutator 20 is in a first position, at this time, the commutator 20 is fixed on the motor shaft 11 by interference fit and is disposed at a distance from the iron core 12, where the distance is set to be an optimal distance for winding the winding wire, and is usually a fixed value preset in the press-fitting process; after winding the winding wire to form the winding 13, the winding 13 is connected between the iron core 12 and the commutator 20, and the commutator 20 receives a rotation pulling force given by the winding wire due to the cross connection of part of the winding wire; the positioning block 312 of the pressing device 31 cooperates with the positioning groove 24 of the commutator 20 to limit the rotation of the commutator 20, and even if the pressing device 31 pushes the commutator 20 in the axial direction to move toward the second position, the commutator 20 does not rotate due to the rotation pulling force given by the winding wire, and the deflection angle of the winding wire is always kept consistent, i.e., the commutator 20 moves to the second position without rotation relative to the iron core 12, as shown in fig. 2.

In the first position, the winding wire is wound onto the core 12 and the commutator 20, the winding 13 being substantially in tension; after the commutator 20 has been moved to the second position by pushing against the pressing means 31, the winding 13 is substantially in a relaxed state. The stretched and relaxed states described herein are two relative terms and do not refer specifically to the fact that the winding 13 must be in a tight or very loose state.

According to the utility model, the positioning block 312 of the pressing device 31 is matched with the positioning groove 24 of the commutator 20 to limit the rotation of the commutator 20, so that the pressing device 31 can push the commutator 20 to move from the first position to the second position in the axial direction without rotation, and the rotor is prevented from being changed by deflection caused by traction rotation of a winding wire during the process of fixing the commutator 20 to the second position, thereby influencing the overall performance of the motor 10.

The present utility model is not limited to the above-described embodiments. Those of ordinary skill in the art will readily appreciate that many other alternatives to the tooling assembly of the present utility model are possible without departing from the principles and scope of the present utility model. The protection scope of the present utility model is subject to the claims.

Claims

1. The tooling assembly comprises a motor, a commutator connected to the motor and a pressing device for connecting the commutator to the motor, wherein the motor comprises a motor shaft extending along the axial direction and an iron core fixedly connected to the motor shaft, the commutator is connected to the motor shaft, and the iron core, the commutator and the pressing device are sequentially arranged along the axial direction; the method is characterized in that: the commutator is provided with a positioning groove positioned at one side facing the pressing device, the pressing device is provided with a positioning block matched with the positioning groove, and the positioning block is accommodated in the positioning groove so as to fix the commutator relative to the iron core along the axial interval.

2. The tooling assembly according to claim 1, wherein: the commutator includes a sleeve portion fixed to the motor shaft, the positioning groove is configured as a circular groove recessed inward from an axial end face of the sleeve portion, and the positioning block is configured as a cylinder extending from the axial end face of the press-in device toward the sleeve portion.

3. The tooling assembly of claim 1, wherein the commutator includes a sleeve portion fixed to the motor shaft and an annular portion extending from an axial end face of the sleeve portion toward the press-in device, and the positioning groove is formed recessed inward from the axial end face of the annular portion.

4. The tooling assembly according to claim 1, wherein: the commutator includes a first position unsecured to the core and a second position secured to the core, the commutator being at a greater axial spacing from the core when in the first position than the commutator is at the second position.

5. The tooling assembly of claim 4, wherein: the positioning grooves and the positioning blocks are at least two, and the positioning grooves and the positioning blocks are respectively and symmetrically arranged relative to the center of the motor shaft, so that the pressing device can push the commutator to move from the first position to the second position in the axial direction without rotation.

6. The tooling assembly of claim 5, wherein: the motor comprises a winding at least partially wound around the core, the winding being axially connected between the core and the commutator, the commutator being in a stretched state when in the first position and in a relaxed state when in the second position.

7. The tooling assembly of claim 6, wherein: the iron core is provided with a plurality of iron core grooves which are distributed at intervals, the commutator is provided with a plurality of reversing grooves which are distributed at intervals, and at least one iron core groove and the reversing grooves are aligned in the axial direction.

8. The tooling assembly according to claim 1, wherein: the commutator and the iron core are fixed to the motor shaft in an interference fit mode.

9. The tooling assembly according to claim 1, wherein: the tool assembly comprises a limiting device used for fixing the motor shaft, and the limiting device is arranged on one side, away from the axial direction of the commutator, of the iron core.

10. The tooling assembly of claim 9, wherein: the limiting device is provided with a boss for propping against one axial end of the motor shaft, the pressing device is provided with a containing groove for containing the other axial end of the motor shaft, and the motor shaft is non-rotatably fixed between the limiting device and the pressing device.