JPS6360625B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a commutator for a DC motor.

[Technical background of the invention and its problems] Normally, this type of commutator has an 8-pole annular field and six coils arranged at the same pitch as shown in Fig. 8. The number of commutator pieces is 12 in the connection relationship between the commutator pieces and the coils of the commutator of a flat DC motor in which wired armature coils are arranged in a flat plate shape. 13
a, 13d, 13g, 13j are connected as a set,
In addition, each commutator piece 13b, 13e, 13h, 13k
are connected to one set, and each commutator piece 13c, 13
f, 13i, and 13l are connected as a set. The process of forming 12 commutator pieces electrically separated from each other in this way into sets of 4 every second and connecting each set using conductive wires externally was extremely troublesome.

[Purpose of the Invention] Therefore, the present invention was created to solve the above-mentioned problems, and consists of 12 commutator pieces arranged in sets of 4 pieces every second. The purpose of the present invention is to provide a commutator for a DC motor that can omit the troublesome process of external connection using conductive wires.

[Summary of the Invention] The gist of the present invention is to provide a single commutator comprising four commutator pieces each having an insertion hole at the tip disposed radially at equal intervals on the outer periphery of a flat hub. A commutator piece assembly, and two commutator piece assemblies each having four commutator pieces each having an insertion hole at the tip thereof arranged radially at equal intervals on the outer periphery of a bulging hub. , and on the other hand, forming a commutator piece fixing plate with a shaft, which has 12 protrusions arranged at 30 degree intervals on the outer peripheral edge of one side, and a recessed part near the center of one side,
The insertion holes of each commutator piece of one of the two commutator piece assemblies are inserted into the four protrusions of the commutator piece fixing plate that are shifted by 90 degrees, and expand into the recesses. Insert and secure so that the protruding hub is fitted,
The insertion holes of each commutator piece of the one commutator piece assembly are inserted and fixed into four protrusions that are shifted by 30 degrees in the circumferential direction from the four protrusions into which this is inserted and fixed, The four protrusions that are further shifted by 30 degrees in the circumferential direction from the four protrusions into which this is inserted and fixed are attached to each commutator of the other commutator segment assembly of the two commutator segment assemblies. The commutator piece is inserted into the insertion hole in such a way that the bulging hub is projected to the opposite side of the recess, and the shaft of the commutator piece fixing plate is provided with a fixture having a recess on one side. Each commutator piece assembly is fixed by press-fitting the two commutator piece assemblies so that the recess is fitted into the bulging hub of the other one of the two commutator piece assemblies. It is something.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 to 6, four commutator pieces 1 having insertion holes 8 at their tips are radially arranged at equal intervals on the outer periphery of a flat hub 10.
Two commutator pieces 2 each having an insertion hole 8 at the tip are arranged radially at equal intervals on the outer periphery of a bulging hub 9. The commutator piece aggregates 12 are each formed by punching with a press, while 12 protrusions 7 are formed on the outer peripheral edge of one side.
Arrange a, 7b, 7c (4 pieces each) at 30 degree intervals,
In addition, a commutator piece fixing plate 4 with a shaft 3 having a concave portion 13 provided near the center of one side is formed, and the four protrusions 7c of the commutator piece fixing plate 4, which are shifted by an appropriate 90 degrees, are provided with the above-mentioned two. The insertion hole 8 of each commutator piece 2 of one of the commutator piece assemblies 12
are inserted so that the bulging hubs 9 are fitted into the recesses 13, and then fixed by crushing the tips of the respective protrusions 7c by heat pressing or the like. The insertion holes 8 of each commutator piece 1 of the one commutator piece assembly 11 are inserted into the four protrusions 7b that are shifted by 30 degrees in the circumferential direction from the four protrusions 7c into which these are inserted and fixed. After inserting the respective protrusions 7b, the tips of the protrusions 7b are crushed by heating and pressing to fix them. The other commutator piece assembly 12 of the two commutator piece assemblies 12 is attached to the four protrusions 7a that are further shifted by 30 degrees in the circumferential direction from the four protrusions 7b into which these are inserted and fixed. After inserting each commutator piece 2 into the insertion hole 8 so that the bulging hub 9 projects to the opposite side of the recess 13, the tip of each protrusion 7a is crushed by heat pressing or the like. This causes it to stick. The shaft 3 of the commutator piece fixing plate 4 is provided with a fixture 5 having a recessed portion 14 on one surface of the other of the two commutator piece assemblies 12.
Each commutator piece assembly 11, 12 is fixed by press-fitting the recess 14 into the bulging hub 9.

[Effects of the Invention] Since the present invention is configured as described above, in use, the commutator of the present invention is connected to a rotor rotating between the magnetic poles of the NS of a flat DC motor, as shown in FIG. Since it can be installed around the axis of the coil, 12 commutator pieces can be installed every two pieces instead of the conventional one.
It is possible to omit the troublesome process of forming individual sets and connecting each set using conductive wires externally.

Furthermore, each commutator piece 2 of one of the two commutator piece assemblies 12 is inserted into the four protrusions 7c of the commutator piece fixing plate 4 that are shifted by an appropriate 90 degrees. The hole 8 is inserted and fixed in such a manner that the bulging hub 9 is fitted into the recess 13, and this is inserted into the four protrusions 7c that are shifted by 30 degrees in the circumferential direction from the inserted and fixed four protrusions 7c. The insertion hole 8 of each commutator piece 1 of the one commutator piece assembly 11 is inserted and fixed into the projection part 7b, and this is further 30 degrees in the circumferential direction from the four inserted and fixed projection parts 7b. The insertion holes 8 of the respective commutator pieces 2 of the other commutator piece assembly 12 of the two commutator piece assemblies 12 are inserted into the four protrusions 7a that are offset from each other.
By inserting and fixing the bulge-shaped hub 9 to the opposite side of the recess 13, one commutator piece of the two commutator piece assemblies 12 is fixed to the commutator piece fixing plate 4. Assembly 12, one commutator piece assembly 1
When the other one of the first and second commutator strip assemblies 12 is inserted and fixed, the bulge shape of the two commutator strip assemblies 12 is formed in the recess 13 of the commutator strip fixing plate 4. Since the protruding directions of the hubs 9 are alternately fitted, each commutator piece assembly 11, 12
There is no need to electrically insulate between them. Therefore, it is also possible to omit the process of forming insulation slits for attaching insulation, which was conventionally necessary between the commutator pieces 1 and 2 of each commutator piece assembly 11 and 12.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway normal view, FIG. 2 is a cross-sectional view taken along the line A-B in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-- 4 shows a commutator piece assembly having a bulging hub, A is a front view, B is a sectional view, and FIG. 5 shows a commutator piece assembly having a flat hub. 6 shows the assembly of the shaft and the commutator piece fixing plate, A is the front view, B is the sectional view, and FIG. 7 shows the commutator of the present invention. A cross-sectional view of the installed state in a flat DC motor, Figure 8 shows an 8-pole 6-coil Y
FIG. 3 is a developed view of a connected state of a commutator piece and a coil of a flat direct current motor. DESCRIPTION OF SYMBOLS 1... Commutator piece, 2... Commutator piece, 3... Shaft, 4... Commutator piece fixing plate, 5... Fixture, 6
...Insulating part, 7a...Protrusion, 7b...Protrusion,
7c...Protrusion, 8...Insertion hole, 9...Hub, 1
0...Hub, 11...Commutator piece assembly, 12...
Commutator piece assembly, 13... recess, 14... recess.

Claims (1)

[Claims] 1. One commutator piece assembly consisting of four commutator pieces each having an insertion hole at the tip arranged radially at equal intervals on the outer periphery of a flat hub, and a bulging hub. On the outer periphery, two commutator pieces assemblies are formed by radially arranging four commutator pieces each having an insertion hole at the tip at equal intervals.On the other hand, on one outer periphery, 12
A commutator piece fixing plate with a shaft is formed by arranging protrusions at 30 degree intervals and a recess near the center of one side,
The insertion holes of each commutator piece of one of the two commutator piece assemblies are inserted into the four protrusions that are shifted by degrees, so that the bulging hub is fitted into the recess. Each commutator piece of the one commutator piece assembly is inserted into four protrusions that are offset by 30 degrees in the circumferential direction from the four protrusions that have been inserted and fixed. The hole was inserted and fixed, and this was further shifted by 30 degrees in the circumferential direction from the four inserted and fixed protrusions.
The insertion hole of each commutator piece of the other commutator piece assembly of the two commutator piece assemblies is formed in the protrusion so that the bulged hub protrudes to the opposite side of the recess. In addition to inserting and fixing, a fixing device having a recessed portion on one side is attached to the shaft of the commutator piece fixing plate to the bulging hub of the other commutator piece assembly of the two commutator piece assemblies. 1. A commutator for a DC motor, characterized in that each commutator piece assembly is fixed by being press-fitted so that a recess is fitted into the commutator.