CN110943353A - Commutator product with reinforcing ring and manufacturing process - Google Patents

Abstract

The invention discloses a commutator product with a reinforcing ring, which comprises an bakelite powder substrate, a reinforcing ring and commutator segments circumferentially arranged on the excircle of the bakelite powder substrate, and is characterized in that: the commutator segment has the same radial thickness dimension and cross section dimension in the whole height direction of the commutator segment except the top excircle, the left and right side surfaces of the commutator segment are provided with longitudinal slots near the inner side, the longitudinal slots penetrate through the whole height of the commutator segment, and the arrangement direction of the longitudinal slots is parallel to the axial direction of the commutator; the reinforcing ring comprises a ring body, fixing pins are arranged on the inner ring of the ring body, an inserting positioning portion is arranged on the outer ring of the ring body, the inserting positioning portion is inserted between two adjacent commutator segments to insulate and separate the two adjacent commutator segments, and the inserting positioning portion is provided with an inserting connector matched with the longitudinal inserting groove. The invention has simple manufacturing process, has the characteristics of high strength and low deformation, and avoids the over-quick abrasion of the carbon brush. Meanwhile, the invention provides a manufacturing process of the commutator with the reinforcing ring.

Description

Commutator product with reinforcing ring and manufacturing process

Technical Field

The invention relates to the technical field of commutators, in particular to a product with a reinforcing ring commutators and a manufacturing process thereof.

Background

The commutator in the prior art is basically composed of an bakelite powder matrix which is integrally molded by pressure injection and commutator segments which are circumferentially arranged on the excircle of the bakelite powder matrix, wherein the inner side surface of each commutator segment is provided with a fixing pin to be combined with the bakelite powder matrix, and some commutator products are provided with reinforcing rings for improving the mechanical strength of the commutator products. In the manufacturing process of the commutator product with the structure, the segment arrangement operation is required, namely the commutator segments are inserted into the segment arrangement die core one by one, after the segment arrangement is finished, a reinforcing ring is placed in a reinforcing ring groove of the commutator segments and fixed, a rubber ring is sleeved on the excircle of the commutator segments, and finally the assembly withdrawing from the segment arrangement die core is installed in a die cavity of a pressure injection die to carry out the pressure injection molding of the commutator product, so that the manufacturing process is complicated; meanwhile, as the inner side surface of the commutator segment is provided with the fixing leg and the reinforcing ring groove, the commutator segment is difficult to ensure to have the same radial thickness dimension and the same cross section dimension in the height direction, so that each part of the commutator segment can generate thermal expansion deformation with different degrees when the commutator works, the cylindrical shape of the commutator can be irregularly deformed by the excircle of the commutator and then is irregular and circular, and the phenomena of too fast abrasion of a carbon brush, noise increase and unstable working of the commutator are caused, so that the motor cannot normally work.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a commutator product with a reinforcing ring, which has the characteristics of simple manufacturing process, high strength and low deformation and can avoid the carbon brush from being worn too fast.

The invention is implemented by the following technical scheme:

the commutator product with the reinforcing ring comprises an bakelite powder substrate, a reinforcing ring and commutator segments circumferentially arranged on the excircle of the bakelite powder substrate, and is characterized in that: the commutator segment has the same radial thickness dimension and cross section dimension in the whole height direction of the commutator segment except the top excircle, the left and right side surfaces of the commutator segment are provided with longitudinal slots near the inner side, the longitudinal slots penetrate through the whole height of the commutator segment, and the arrangement direction of the longitudinal slots is parallel to the axial direction of the commutator; the reinforcing ring comprises a ring body, fixing pins are arranged on the inner ring of the ring body, an inserting positioning portion is arranged on the outer ring of the ring body, the inserting positioning portion is inserted between two adjacent commutator segments to insulate and separate the two adjacent commutator segments, and the inserting positioning portion is provided with an inserting connector matched with the longitudinal inserting groove.

The direction of the fixed foot is the same as the longitudinal slot, the length of the fixed foot is equivalent to that of the commutator segment, the ring body is composed of an upper section and a lower section, the upper section and the lower section of the ring body are fixedly connected by the fixed foot, and the ring body, the fixed foot and the inserting positioning part are of an integrally formed structure.

The cross section of the fixing foot is in a dovetail shape.

According to the commutator product with the reinforcing ring, the reinforcing ring is designed to be of a structure that the outer circle of the reinforcing ring is provided with the plug connectors, and the plug-in grooves with the same functions as the segment arranging mold cores are formed between the adjacent plug connectors, so that the reinforcing ring not only plays a role in reinforcing the commutator segments, but also plays a role in automatically arranging the commutator segments, and the commutator segments can be automatically arranged on the reinforcing ring through the sheet inserting machine; meanwhile, the ring body of the reinforcing ring is composed of an upper section and a lower section, so that the reinforcing ring can be directly molded into the commutator, and compared with the prior art, the commutator is manufactured without the procedures of reinforcing ring placement, reinforcing ring fixation, rubber ring sleeving, piece arranging mold core withdrawing and the like, and the manufacturing process is obviously simple; in addition, because the inner side surface of the commutator segment is not provided with a fixing pin and a reinforcing ring groove, and only the left side surface and the right side surface are provided with longitudinal slots, the whole height of the commutator segment (except a small section at the top) has the same radial thickness dimension and cross section dimension, so that each part of each commutator segment can generate basically same thermal expansion deformation when the commutator works, the cylindrical shape of the commutator can be kept unchanged by the excircle of the commutator, namely the low deformation of the cylindrical shape of the commutator when the commutator works is kept, and the situations of over-fast abrasion, noise increase and unstable work caused by the irregular deformation of the cylindrical shape are avoided.

Meanwhile, the invention provides a process for manufacturing the commutator product, which adopts the technical scheme that:

a manufacturing process of a commutator with a reinforcing ring is characterized by comprising the following steps of ① forming commutator segments, forming longitudinal slots on the left side surface and the right side surface of each commutator segment, ② forming the reinforcing ring, arranging fixing pins on the inner ring of the reinforcing ring, arranging inserting positioning parts on the outer ring of the reinforcing ring, ③ automatically inserting the commutator segments onto the reinforcing ring through an automatic insert machine, ④ placing the reinforcing ring inserted with the commutator segments into a die cavity of an injection molding die, injecting wood powder into the die cavity, then performing injection molding on the commutator segments, the reinforcing ring and the wood powder together, ⑤ opening the die and taking out a commutator product with the reinforcing ring.

Drawings

The invention has the following drawings:

figure 1 is a top view in elevation of a commutator product of the invention,

figure 2 is an axial cross-sectional view of a commutator product of the invention,

figure 3 is a connecting structure diagram of a segment and a reinforcing ring of the commutator product of figure 1,

fig. 4 is a structural view of the reinforcement ring of fig. 3.

Detailed Description

As shown in the figure, the commutator product with the reinforcing ring comprises an bakelite powder substrate 1, a reinforcing ring 3 and commutator segments 2 circumferentially arranged on the excircle of the bakelite powder substrate, wherein the commutator segments 2 have the same radial thickness dimension and cross section dimension in the whole height direction of the commutator segments except the top excircle, the left side and the right side of the commutator segments 2 are provided with arc-shaped longitudinal slots 21 at positions close to the inner sides, the longitudinal slots 21 penetrate through the whole height of the commutator segments 2, and the arrangement direction of the longitudinal slots 21 is parallel to the axial direction of the commutator; the reinforcing ring 3 comprises a ring body 31, a fixing pin 33 is arranged on the inner ring of the ring body 31, the arrangement direction of the fixing pin 33 is the same as that of the longitudinal slot 21, the length of the fixing pin 33 is equivalent to that of the commutator segments 2 (equal to the length which is slightly smaller than the commutator segments), the cross section of the fixing pin 33 is in a dovetail shape, an inserting positioning part 32 is arranged on the outer ring of the ring body 31, the inserting positioning part 32 is inserted between two adjacent commutator segments 2 to insulate and separate the two adjacent commutator segments 2, and two sides of the inserting positioning part 32 are provided with inserting connectors matched with the longitudinal slot 21; the ring body 31 is composed of an upper section and a lower section, the upper section and the lower section are connected and fixed by the fixing feet 33, and the ring body 31, the fixing feet 33 and the inserting positioning part 32 are of an integrally formed structure.

The invention relates to a manufacturing process of a commutator product with a reinforcing ring, which comprises the following steps of ① forming a commutator segment, forming longitudinal slots on the left side surface and the right side surface of the commutator segment, ② forming the reinforcing ring, arranging fixing pins on the inner ring of the reinforcing ring, arranging inserting positioning parts on the outer ring of the reinforcing ring, ③ automatically inserting the commutator segment onto the reinforcing ring through an automatic insert machine, ④ placing the reinforcing ring inserted with the commutator segment into a die cavity of an injection die, injecting wood flour into the die cavity, then performing injection molding on the commutator segment, the reinforcing ring and the wood flour together, and ⑤ opening the die to obtain the commutator product with the reinforcing ring.

Claims (4)

1. The commutator product with the reinforcing ring comprises an bakelite powder substrate, a reinforcing ring and commutator segments circumferentially arranged on the excircle of the bakelite powder substrate, and is characterized in that: the commutator segment has the same radial thickness dimension and cross section dimension in the whole height direction of the commutator segment except the top excircle, the left and right side surfaces of the commutator segment are provided with longitudinal slots near the inner side, the longitudinal slots penetrate through the whole height of the commutator segment, and the arrangement direction of the longitudinal slots is parallel to the axial direction of the commutator; the reinforcing ring comprises a ring body, fixing pins are arranged on the inner ring of the ring body, an inserting positioning portion is arranged on the outer ring of the ring body, the inserting positioning portion is inserted between two adjacent commutator segments to insulate and separate the two adjacent commutator segments, and the inserting positioning portion is provided with an inserting connector matched with the longitudinal inserting groove.

2. The commutator product with reinforcing rings of claim 1, wherein: the direction of the fixed foot is the same as the longitudinal slot, the length of the fixed foot is equivalent to that of the commutator segment, the ring body is composed of an upper section and a lower section, the upper section and the lower section of the ring body are fixedly connected by the fixed foot, and the ring body, the fixed foot and the inserting positioning part are of an integrally formed structure.

3. The commutator product with reinforcing rings of claim 2, wherein: the cross section of the fixing foot is in a dovetail shape.

4. A manufacturing process of a commutator with a reinforcing ring is characterized by comprising the following steps of ① forming commutator segments, forming longitudinal slots on the left side surface and the right side surface of each commutator segment, ② forming a reinforcing ring, arranging fixing pins on the inner ring of the reinforcing ring, arranging inserting positioning parts on the outer ring of the reinforcing ring, ③ automatically inserting the commutator segments onto the reinforcing ring through an automatic insert machine, ④ placing the reinforcing ring inserted with the commutator segments into a die cavity of an injection molding die, injecting wood powder into the die cavity, then performing injection molding on the commutator segments, the reinforcing ring and the wood powder together, and ⑤ opening the die to obtain a commutator product with the reinforcing ring.

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