CN210074380U - High-strength hook-type commutator - Google Patents

Abstract

The utility model discloses a high strength hook-type commutator, make the switching-over copper sheet that the circumference was arranged including the bakelite powder base member and at bakelite powder base member excircle, the top of switching-over copper sheet is equipped with the crotch, switching-over copper sheet and the integrative pressure injection molding of bakelite powder base member, two swallow-tailed feet implant bakelite powder base member about the medial surface of switching-over copper sheet is equipped with, leave insulating distance each other between the adjacent switching-over copper sheet, insulating distance is at one section high packing bakelite powder that is close to bakelite powder base member up end, all the other partial milling flutes, the top of milling flutes has the circular arc transition, its characterized in: each dovetail foot is provided with an inner dovetail groove and an outer dovetail groove which are distributed in a stepped mode along the radial direction of the commutator, wherein the size of the outer dovetail groove is larger than that of the inner dovetail groove. The utility model has the characteristics of intensity is high, appearance quality is good.

Description

High-strength hook-type commutator

Technical Field

The utility model relates to a commutator technical field, concretely relates to hook-type commutator.

Background

The hook-type commutator comprises a bakelite powder substrate and commutation copper sheets circumferentially arranged on the excircle of the bakelite powder substrate, wherein a hook is arranged at the top of each commutation copper sheet, adjacent commutation copper sheets are separated from each other by an insulation distance (the insulation distance is filled with the bakelite powder) and are milled with grooves, and an upper dovetail pin and a lower dovetail pin are arranged on the inner side surface of each commutation copper sheet and are embedded into the bakelite powder substrate. The mechanical strength of the hook-shaped commutator with the dovetail pin structure is difficult to improve because the binding force between the dovetail pin and the bakelite powder substrate is limited. In addition, in order to prevent glue from entering an insulating groove during coil glue dripping treatment, the insulating distance is not milled through by a milling groove at a section of height close to the upper end face of the bakelite powder substrate, for a commutator copper sheet with punching notches arranged on two sides, because the lower punching surface of each punching notch is a plane, namely the tangent height of the lower punching surface on the inner side face of the commutator sheet is equal to the tangent height on the outer side face, and the milling cutter of each milling groove is a disc cutter, the milling cutter needs to mill the tangent of the lower punching surface on the inner side face of the commutator sheet during slot milling, the milling cutter needs to move upwards for a certain distance after milling the tangent of the lower punching surface on the outer side face of the commutator sheet, namely the top of each milling groove is far away from the tangent of the lower punching surface on the outer side face of the commutator sheet, and because the position of each milling groove cannot be completely aligned with the punching notch, the left position and the right position of, therefore, the commutator copper sheets on the two sides of the milling groove can be milled by a milling cutter on one side of the position of the die-cut notch, and bakelite powder hanging materials (the commutator copper sheets are yellow, and the bakelite powder hanging materials are black) are left when the other side of the commutator copper sheets cannot be milled; because the top of the milling groove is far away from the tangent line of the punching surface on the outer side surface of the commutator segment under the punching notch, the length of the bakelite powder hanging material is longer, and the appearance quality of the hook-type commutator is seriously influenced.

Disclosure of Invention

In view of the deficiencies of the prior art, the to-be-solved technical problem of the present invention is to provide a high strength hook-type commutator with the characteristics of high strength and good appearance quality.

The utility model discloses a realize through following technical scheme:

high strength hook-type commutator, including the bakelite powder base member and the switching-over copper sheet of arranging at bakelite powder base member excircle circumference, the top of switching-over copper sheet is equipped with the crotch, switching-over copper sheet and the integrative pressure casting shaping of bakelite powder base member, two dovetail feet about the medial surface of switching-over copper sheet is equipped with implant in the bakelite powder base member, leave insulating distance each other between the adjacent switching-over copper sheet, insulating distance is at one section high packing bakelite powder that is close to bakelite powder base member up end, all the other partial milling flutes, the top of milling flute has circular arc transition, its characterized in that: each dovetail foot is provided with an inner dovetail groove and an outer dovetail groove which are distributed in a stepped mode along the radial direction of the commutator, wherein the size of the outer dovetail groove is larger than that of the inner dovetail groove.

The switching-over copper sheet is the bar body before the shaping, and the lateral surface of the bar body is the arc surface, and the side is equipped with die-cut breach being close to the top position about the bar body, and the twice width of die-cut breach equals the width of insulating distance, and the upper and lower cutting face of die-cut breach is the inclined plane, and the inclined plane makes the tangent line height of cutting face on the bar body lateral surface down be greater than the tangent line height on the medial surface, the top of milling flutes is close to with the tangent line of cutting face on the bar body lateral surface down.

The inclined angle between the inclined plane and the height direction of the strip-shaped body is 30-40 degrees.

According to the hook-type commutator of the technical scheme, firstly, each dovetail pin is provided with the inner dovetail groove and the outer dovetail groove which are arranged along the radial direction of the commutator in a stepped mode, so that when the commutator copper sheet and the bakelite powder substrate are integrally molded by pressure injection, the bakelite powder can be filled into the inner dovetail groove and the outer dovetail groove, namely four dovetail pin structures with different sizes are added to the commutator copper sheet, the binding force between the dovetail pins and the bakelite powder substrate can be effectively improved, and the mechanical strength of the hook-type commutator is greatly improved on the premise that the dovetail pin structure in the prior art is not changed. In addition, the lower cutting face of the punching notch arranged on the two sides of the commutator copper sheet is an inclined face, and the inclined face enables the tangent height of the lower cutting face on the outer side face of the strip-shaped body to be larger than the tangent height on the inner side face, so that only the inclination angle of the inclined face is reasonably designed, the disc milling cutter can mill the tangent of the lower cutting face on the inner side face of the commutator segment when finishing milling the tangent of the lower cutting face on the outer side face of the commutator segment, and the milling cutter does not need to move upwards for a certain distance, namely the top of the milling groove does not need to be far away from the tangent of the lower cutting face on the; therefore, even if the reversing copper sheets on the two sides of the milling groove are milled by the milling cutter on one side of the position of the punching notch, and the other side of the reversing copper sheets cannot be milled to leave bakelite powder hanging materials, the length of the bakelite powder hanging materials is also very short because the top of the milling groove is close to a tangent line of the punching notch on the outer side surface of the reversing sheet, the appearance quality of the hook-type commutator is hardly influenced, and the appearance quality is ensured.

Drawings

The utility model discloses there is following figure:

figure 1 is a schematic structural diagram of the present invention,

figure 2 is a bottom view in elevation of figure 1,

figure 3 is a lateral side view of the commutation copper sheet,

figure 4 is a left side view of figure 3,

figure 5 is a top view of figure 4,

FIG. 6 is a structural view of the commutation copper sheet and the bakelite powder matrix after being integrally injection-molded.

Detailed Description

As shown in fig. 1, 2, the utility model discloses a high strength hook type commutator, make the switching-over copper sheet 1 that the circumference was arranged including bakelite powder base member 3 and at bakelite powder base member 3 excircle, switching-over copper sheet 1's top is equipped with crotch 2, switching-over copper sheet 1 and bakelite powder base member 3 integrative pressure injection molding, two dovetail feet 14 implant in the bakelite powder base member about switching-over copper sheet 1's medial surface is equipped with, leave insulating distance each other between the adjacent switching-over copper sheet 1, insulating distance is at a section highly filling bakelite powder that is close to bakelite powder base member 3 up end, all the other parts milling flutes 4, milling flutes 4's top has circular arc transition 5, every dovetail foot 14 is equipped with along the inside and outside two dovetail that commutator radial direction ladder was laid, wherein outside dovetail 15's size is greater than inboard dovetail 16.

As shown in fig. 3-5, the reversing copper sheet 1 is a strip-shaped body 10 before being formed, the outer side surface of the strip-shaped body 10 is an arc surface, the inner side surface is provided with an upper dovetail 14 and a lower dovetail 14, the top of the strip-shaped body 10 is processed along a dotted line on the upper surface of fig. 3 and then is bent to form the hook 2, the left side surface and the right side surface of the strip-shaped body 10 are provided with a punching notch 11 at a position close to the upper part, the width twice of the punching notch 11 is equal to the width of an insulation distance, an upper punching tangent plane 13 and a lower punching tangent plane 12 of the punching notch 11 are inclined planes, the height of a tangent line 121 of the lower punching tangent plane 12 on the outer side surface of the strip-shaped body 10 is larger than that of a tangent line 122 on the inner side surface, the inclined angle between. As shown in fig. 6, after the commutation copper sheet and the bakelite powder base body in fig. 3 are integrally injection molded, when the milling groove 4 is machined, the disc milling cutter only needs to move to the position of the lower line a, so that the tangent 122 of the lower punching surface on the inner side surface of the commutator segment can be milled, and the distance between the top height of the milling groove (the position of the line a) and the tangent 121 of the lower punching surface on the outer side surface of the commutator segment is very short, so that the length of the bakelite powder hanging material is very short, and the appearance quality of the hook-type commutator is ensured; in the prior art, the tangent 122 of the lower cutting face on the inner side face of the commutator segment can be milled only by moving the milling cutter to the position of the upper line B, and the distance from the top height (the position of the line B) of the milling groove to the tangent 121 of the lower cutting face on the outer side face of the commutator segment is far; so compared with the prior art, the utility model, the length that the bakelite powder hung the material on the switching-over copper sheet of milling flutes both sides can be very short, and commutator appearance quality is good.

Claims (3)

1. High strength hook-type commutator, including the bakelite powder base member and the switching-over copper sheet of arranging at bakelite powder base member excircle circumference, the top of switching-over copper sheet is equipped with the crotch, switching-over copper sheet and the integrative pressure casting shaping of bakelite powder base member, two dovetail feet about the medial surface of switching-over copper sheet is equipped with implant in the bakelite powder base member, leave insulating distance each other between the adjacent switching-over copper sheet, insulating distance is at one section high packing bakelite powder that is close to bakelite powder base member up end, all the other partial milling flutes, the top of milling flute has circular arc transition, its characterized in that: each dovetail foot is provided with an inner dovetail groove and an outer dovetail groove which are distributed in a stepped mode along the radial direction of the commutator, wherein the size of the outer dovetail groove is larger than that of the inner dovetail groove.

2. The high strength hook-type commutator according to claim 1, wherein: the switching-over copper sheet is the bar body before the shaping, and the lateral surface of the bar body is the arc surface, and the side is equipped with die-cut breach being close to the top position about the bar body, and the twice width of die-cut breach equals the width of insulating distance, and the upper and lower cutting face of die-cut breach is the inclined plane, and the inclined plane makes the tangent line height of cutting face on the bar body lateral surface down be greater than the tangent line height on the medial surface, the top of milling flutes is close to with the tangent line of cutting face on the bar body lateral surface down.

3. The high strength hook-type commutator according to claim 2, wherein: the inclined angle between the inclined plane and the height direction of the strip-shaped body is 30-40 degrees.

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