LU502166B1 - Hook type commutator having mica ring - Google Patents

Abstract

A hook type commutator having a mica ring includes a bushing, an insulating sleeve, a set of commutator segments, and a set of mica sheets, where the bushing and insulating sleeve each has an annular cross section, and the bushing is arranged on an internal wall of the insulating sleeve; the commutator segment and the mica sheet are arranged in an annular array with a center of the bushing as a center of a circle; adjacent two of the commutator segments are spaced with the mica sheet; and the mica sheet includes a sheet-like body, a first positioning protrusion, a second positioning protrusion, and a mica slot. According to the hook type commutator having a mica ring of the present disclosure, the structure is properly designed; on the commutator manufactured by injection moulding, the mica sheet is squeezed by adjacent two of the commutator segments to be fixed between them.

Description

DESCRIPTION LUS02166

HOOK TYPE COMMUTATOR HAVING MICA RING

TECHNICAL FIELD The present disclosure belongs to the technical field of commutators, and particularly relates to a hook type commutator having a mica ring.

BACKGROUND Commutators, commonly known as split-ring commutators, can achieve current commutation to keep motors running. Hook type commutators are typically composed of a base and copper commutator segments circumferentially arranged at the periphery of the base. Each copper commutator segment basically consists of a sheet-like main part and a hook arranged on an internal wall of the sheet-like main part. During the moulding of the commutators, the sheet-like main parts are configured in the base of the commutator by means of the hooks to be firmly combined with the base of the commutator. Most existing commutators include mica sheets through which the commutator segments are isolated. The mica sheets of traditional commutators are formed to be straight and rectangular. On the commutators manufactured by injection moulding, each mica sheet is squeezed by adjacent two of the commutator segments to be fixed between them. The mica sheets are basically separated from plastic mould cores of the commutators. When the commutators run along with the motors at a high speed, in spite of slight weights, the mica sheets which are not tightly squeezed by the commutator segments are likely to be displaced or disengaged from the surfaces of the commutators. Consequentially, the quality of the commutators is seriously affected.

SUMMARY The objective of the present disclosure is to provide a hook type commutator having a mica ring to solve the problem of failure, caused by mica sheets that are improper in structure disengage from commutator segments, of commutators in the prior art. The present disclosure adopts the following technical solutions: a hook type commutator having a mica ring includes a bushing, an insulating sleeve, a set of commutator segments, and a set of mica sheets, where the bushing as well as the insulating sleeve has an annular cross section, and the bushing is arranged on an internal wall of the insulating sleeve; the commutator segment as well as the mica sheet is arranged in an annular array with a center of the bushing as a center of a circle; adjacent two of the commutator segments are spaced with the mica sheet; and the mica sheet includes a sheet-like body, a first positioning protrusion, a second positioning protrusion, and-4/502166 mica slot.

Where, the first positioning protrusion and the second positioning protrusion are fixedly arranged at an edge, close to the center of the bushing, of the sheet-like body; the mica slot is formed between the first positioning protrusion and the second positioning protrusion; the first positioning protrusion is inserted into a first groove formed in an external wall of the insulating sleeve; the second positioning protrusion is inserted into a second groove formed in the external wall of the insulating sleeve; and a third protrusion between the first groove and the second groove is inserted into the mica slot.

According to the hook type commutator having a mica ring and manufactured by adopting the mica sheet of the above structure, firmness of the mica sheet of the commutator is enhanced; and adjacent two of the commutator segments are spaced with the specially-designed mica sheet, so that the quality of the commutator is improved.

Further, the first positioning protrusion, the second positioning protrusion, the first groove, and the second groove each have a same gourd-shaped cross section.

Further, the first positioning protrusion as well as the second positioning protrusion includes an elliptical fourth protrusion, two symmetrical U-shaped first bends, and two symmetrical arc- shaped second bends, where a first opening is formed at an end, away from the insulating sleeve, of the elliptical fourth protrusion; two ends of the elliptical fourth protrusion are respectively connected to ends, close to the elliptical fourth protrusion, of the two symmetrical U-shaped first bends; and the two symmetrical arc-shaped second bends in one-to-one correspondence with the two symmetrical U-shaped first bends are respectively connected to ends, away from the elliptical fourth protrusion, of the two symmetrical U-shaped first bends.

Further, the arc-shaped second bend outwards extends away from a center of the elliptical fourth protrusion, and is formed into a quarter-circle arc.

Further, a rectangular fifth protrusion is arranged on a side, close to the insulating sleeve, of a lower end of the sheet-like body; a first tip is formed at a lower end of the rectangular fifth protrusion; a triangular fourth groove is located in a rectangular third groove formed in the insulating sleeve; the rectangular fifth protrusion is inserted into the rectangular third groove; and the first tip is inserted into the triangular fourth groove.

Further, at least one swallow-tailed sixth protrusion is arranged at an end, close to the insulating sleeve, of the commutator segment, and is inserted into a swallow-tailed fifth groove formed in the external wall of the insulating sleeve.

Further, a rectangular seventh protrusion is arranged on a side, close to the insulating sleeve, of a lower end of the commutator segment; a second tip is formed at a lower end of the rectangular seventh protrusion; the rectangular seventh protrusion is inserted into a rectangular sixth groove formed in the insulating sleeve; and the second tip is squeezed into an internal wall of th&/502166 rectangular sixth groove. Further, a set of reinforcing rings are arranged on the insulating sleeve. Further, a set of annular seventh grooves are axially formed in a periphery of the bushing in sequence; a set of annular eighth protrusions are axially formed on the internal wall of the insulating sleeve in sequence; the bushing is coaxial with the insulating sleeve; and the annular eighth protrusions in one-to-one correspondence with the annular seventh grooves are inserted into the annular seventh grooves. Further, an elongated hole is formed in an internal wall of the bushing and located in an end, provided with hooks, of a cylinder. As can be seen from the above technical solutions, the hook type commutator having a mica ring has the following advantages: the structure is properly designed; on the commutator manufactured by injection moulding, the mica sheet is squeezed by adjacent two of the commutator segments to be fixed between them; and the gourd-shaped first positioning protrusion and gourd-shaped second positioning protrusion of the mica sheet are firmly combined with the insulating sleeve. In this way, a fastening force of the mica sheet in the commutator is greatly increased, so that the mica sheet is effectively prevented from being displaced or disengaging in a case of high-speed operation of a motor. Accordingly, the quality of the commutator is improved. Besides, a tension force is generated between the first tip on the mica sheet and a stepped end face of the commutator to a certain extent, so that the operation stability of the commutator is effectively enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a structural diagram of a hook type commutator having a mica ring of the present disclosure; FIG. 2 is a partial enlarged view of part C in FIG. 1 of the present disclosure; FIG. 3 is a partial enlarged view of part À in FIG. 1 of the present disclosure; and FIG. 4 is a partial enlarged view of part B in FIG. 1 of the present disclosure. Reference numerals: 1. bushing, 11. annular seventh groove, 12. elongated hole, 2. insulating sleeve, 21. first groove, 22. second groove, 23. third protrusion, 24. rectangular third groove, 25. triangular fourth groove, 26. swallow-tailed fifth groove, 27. rectangular sixth groove, 28. reinforcing ring, 29. annular eighth protrusion, 3. commutator segment, 31. swallow-tailed sixth protrusion, 32. rectangular seventh protrusion, 33. second tip, 4. mica sheet, 41. sheet-like body,

411. rectangular fifth protrusion, 412. first tip, 42. first positioning protrusion, 421. elliptical fourth protrusion, 422. U-shaped first bend, 423. arc-shaped second bend, 424. first opening, 43. second positioning protrusion, 44. mica slot. LUS02166

DETAILED DESCRIPTION OF THE EMBODIMENTS The embodiments of the present disclosure are described below in detail. Examples of the embodiments are shown in the drawings. The same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout the specification. The embodiments described below with reference to the drawings are illustrative, which are merely intended to explain the present disclosure, rather than to limit the present disclosure. It should be understood that, in the description of the present disclosure, the terms such as "central", "longitudinal", "transverse", "long", "wide", "thick", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise" and "anticlockwise" are intended to indicate orientations or positional relations shown in the drawings. It should be noted that these terms are merely intended to facilitate a simple description of the present disclosure, rather than to indicate or imply that the mentioned apparatus or elements must have the specific orientation or be constructed and operated in the specific orientation. Therefore, these terms may not be construed as a limitation to the present disclosure. Moreover, the terms such as "first" and "second" are used only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features denoted. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specifically defined, "a plurality of" means two or more. In the present disclosure, unless otherwise clearly specified and defined, the terms "provided", "connected with", "connected to", and "fixed" should be understood in a broad sense. For example, the connection may be a fixed connection, a detachable connection or an integrated connection, may be a mechanical connection or an electrical connection, may be a direct connection or an indirect connection with use of an intermediate medium, or may be intercommunication between two components. Those of ordinary skill in the art may understand specific meanings of the above terms in the present disclosure based on a specific situation. In the present disclosure, unless otherwise expressly specified and defined, that a first feature is "above" or "under" a second feature may include that the first feature is in direct contact with the second feature, or that the first feature and the second feature are not in direct contact with each other but are in contact by using another feature between them. In addition, that the first feature is "over", "above", and "on" the second feature includes that the first feature is directly above and diagonally above the second feature, or simply indicates that a horizontal height of the first feature is larger than that of the second feature.

The case where the first feature is "beneath", "below", arkd/502166 "under" the second feature includes that the first feature is directly below and diagonally below the second feature, or simply indicates that the altitude of the first feature is lower than that of the second feature.

Embodiment 1 As shown in FIG. 1, a hook type commutator having a mica ring includes a bushing 1, an insulating sleeve 2, a set of commutator segments 3, and a set of mica sheets 4. Where, the bushing 1 as well as the insulating sleeve 2 has an annular cross section, and the bushing 1 is arranged on an internal wall of the insulating sleeve 2. The commutator segment 3 as well as the mica sheet 4 is arranged in an annular array with a center of the bushing 1 as a center of a circle, and adjacent two of the commutator segments 3 are spaced with the mica sheet 4. The mica sheet 4 includes a sheet-like body 41, a first positioning protrusion 42, a second positioning protrusion 43, and a mica slot 44, where the first positioning protrusion 42 and the second positioning protrusion 43 are fixedly arranged at an edge, close to the center of the bushing 1, of the sheet-like body 41; the mica slot 44 is formed between the first positioning protrusion 42 and the second positioning protrusion 43; the first positioning protrusion 42 is inserted into a first groove 21 formed in an external wall of the insulating sleeve 2; the second positioning protrusion 43 is inserted into a second groove 22 formed in the external wall of the insulating sleeve 2; and a third protrusion 23 between the first groove 21 and the second groove 22 is inserted into the mica slot 44. Embodiment 2 As shown in FIG. 2, the first positioning protrusion 42, the second positioning protrusion 43, the first groove 21, and the second groove 22 each have a same gourd-shaped cross section.

In this structure, the first positioning protrusion 42 as well as the second positioning protrusion 43 includes an elliptical fourth protrusion 421, two symmetrical U-shaped first bends 422, and two symmetrical arc-shaped second bends 423, where a first opening 424 is formed at an end, away from the insulating sleeve 2, of the elliptical fourth protrusion 421; two ends of the elliptical fourth protrusion 421 are respectively connected to ends, close to the elliptical fourth protrusion 421, of the two symmetrical U-shaped first bends 422; and the two symmetrical arc-shaped second bends 423 in one-to-one correspondence with the two symmetrical U-shaped first bends 422 are respectively connected to ends, away from the elliptical fourth protrusion 421, of the two symmetrical U-shaped first bends 422. In addition, the arc-shaped second bend 423 outwards extends away from a center of the elliptical fourth protrusion 421, and is formed into a quarter- circle arc.

By adoption of the structure, the mica sheet 4 can be connected to the insulating sleeve 2 more tightly, so that the stability of the whole commutator is improved.

Embodiment 3 LU502166 As shown in FIG. 3, a rectangular fifth protrusion 411 is arranged on a side, close to the insulating sleeve 2, of a lower end of the sheet-like body 41; a first tip 412 is formed at a lower end of the rectangular fifth protrusion 411; a triangular fourth groove 25 is located in a rectangular third groove 24 formed in the insulating sleeve 2; the rectangular fifth protrusion 411 is inserted into the rectangular third groove 24; and the first tip 412 is inserted into the triangular fourth groove

25. As the first tip 412 is clamped in the triangular fourth groove 25, a centrifugal force affecting the mica sheets is partially counteracted during operation of the commutator, so that the stability of the mica sheets is improved. In addition, at least one swallow-tailed sixth protrusion 31 is arranged at an end, close to the insulating sleeve 2, of the commutator segment 3, and is inserted into a swallow-tailed fifth groove 26 formed in the external wall of the insulating sleeve 2. Embodiment 4 As shown in FIG. 4, a rectangular seventh protrusion 32 is arranged on a side, close to the insulating sleeve 2, of a lower end of the commutator segment 3; a second tip 33 is formed at a lower end of the rectangular seventh protrusion 32; the rectangular seventh protrusion 32 is inserted into a rectangular sixth groove 27 formed in the insulating sleeve 2; and the second tip 33 is squeezed into an internal wall of the rectangular sixth groove 27. In addition, a set of annular seventh grooves 11 are axially formed in a periphery of the bushing 1 in sequence; a set of annular eighth protrusions 29 are axially formed on the internal wall of the insulating sleeve 2 in sequence; the bushing 1 is coaxial with the insulating sleeve 2; and the annular eighth protrusions 29 in one- to-one correspondence with the annular seventh grooves 11 are inserted into the annular seventh grooves 11. During assembly, the second tip 33 is tightly squeezed into the rectangular sixth groove 27 to make the rectangular seventh protrusion 32 be in interference fit with the rectangular sixth groove 27, so that the stability in a connection process is improved. In addition, a set of reinforcing rings 28 are arranged on the insulating sleeve 2; an elongated hole 12 is formed in an internal wall of the bushing 1 and located in an end, provided with hooks, of a cylinder. The above described are merely preferred implementations of the present disclosure. It should be noted that for a person of ordinary skill in the art, several improvements may further be made without departing from the principle of the present disclosure, but such improvements should also be deemed as falling within the protection scope of the present disclosure.

Claims (10)

CLAIMS LU502166

1. A hook type commutator having a mica ring, comprising a bushing (1), an insulating sleeve (2), a set of commutator segments (3), and a set of mica sheets (4), wherein the bushing (1) and insulating sleeve (2) each has an annular cross section, and the bushing (1) is arranged on an internal wall of the insulating sleeve (2); the commutator segment (3) and the mica sheet (4) are arranged in an annular array with a center of the bushing (1) as a center of a circle; adjacent two of the commutator segments (3) are spaced with the mica sheet (4); and the mica sheet (4) comprises a sheet-like body (41), a first positioning protrusion (42), a second positioning protrusion (43), and a mica slot (44), wherein the first positioning protrusion (42) and the second positioning protrusion (43) are fixedly arranged at an edge, close to the center of the bushing (1), of the sheet-like body (41); the mica slot (44) is formed between the first positioning protrusion (42) and the second positioning protrusion (43); the first positioning protrusion (42) is inserted into a first groove (21) formed in an external wall of the insulating sleeve (2); the second positioning protrusion (43) is inserted into a second groove (22) formed in the external wall of the insulating sleeve (2); and a third protrusion (23) between the first groove (21) and the second groove (22) is inserted into the mica slot (44).

2. The hook type commutator having a mica ring according to claim 1, wherein the first positioning protrusion (42), the second positioning protrusion (43), the first groove (21), and the second groove (22) each have a same gourd-shaped cross section.

3. The hook type commutator having a mica ring according to claim 1, wherein the first positioning protrusion (42) and the second positioning protrusion (43) each comprises an elliptical fourth protrusion (421), two symmetrical U-shaped first bends (422), and two symmetrical arc- shaped second bends (423), wherein a first opening (424) is formed at an end, away from the insulating sleeve (2), of the elliptical fourth protrusion (421); two ends of the elliptical fourth protrusion (421) are respectively connected to ends, close to the elliptical fourth protrusion (421), of the two symmetrical U-shaped first bends (422); and the two symmetrical arc-shaped second bends (423) in one-to-one correspondence with the two symmetrical U-shaped first bends (422) are respectively connected to ends, away from the elliptical fourth protrusion (421), of the two symmetrical U-shaped first bends (422).

4. The hook type commutator having a mica ring according to claim 3, wherein the arc-shaped second bend (423) outwards extends away from a center of the elliptical fourth protrusion (421), and is formed into a quarter-circle arc.

5. The hook type commutator having a mica ring according to claim 1, wherein a rectangular fifth protrusion (411) is arranged on a side, close to the insulating sleeve (2), of a lower end of the sheet-like body (41); a first tip (412) is formed at a lower end of the rectangular fifth protrusidit/502166 (411); a triangular fourth groove (25) is located in a rectangular third groove (24) formed in the insulating sleeve (2); the rectangular fifth protrusion (411) is inserted into the rectangular third groove (24); and the first tip (412) is inserted into the triangular fourth groove (25).

6. The hook type commutator having a mica ring according to claim 1, wherein at least one swallow-tailed sixth protrusion (31) is arranged at an end, close to the insulating sleeve (2), of the commutator segment (3), and is inserted into a swallow-tailed fifth groove (26) formed in the external wall of the insulating sleeve (2).

7. The hook type commutator having a mica ring according to claim 6, wherein a rectangular seventh protrusion (32) is arranged on a side, close to the insulating sleeve (2), of a lower end of the commutator segment (3); a second tip (33) is formed at a lower end of the rectangular seventh protrusion (32); the rectangular seventh protrusion (32) is inserted into a rectangular sixth groove (27) formed in the insulating sleeve (2); and the second tip (33) is squeezed into an internal wall of the rectangular sixth groove (27).

8. The hook type commutator having a mica ring according to claim 1, wherein a set of reinforcing rings (28) are arranged on the insulating sleeve (2).

9. The hook type commutator having a mica ring according to claim 1, wherein a set of annular seventh grooves (11) are axially formed in a periphery of the bushing (1) in sequence; a set of annular eighth protrusions (29) are axially formed on the internal wall of the insulating sleeve (2) in sequence; the bushing (1) is coaxial with the insulating sleeve (2); and the annular eighth protrusions (29) in one-to-one correspondence with the annular seventh grooves (11) are inserted into the annular seventh grooves (11).

10. The hook type commutator having a mica ring according to claim 8, wherein an elongated hole (12) is formed in an internal wall of the bushing (1) and located in an end, provided with hooks, of a cylinder.