JPH0223077Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to the machine frame structure of a rotating electrical machine such as a DC motor, and in particular to a locking fitting structure between a yoke and a front machine frame of a rotating electrical machine. be.

[Conventional technology]

FIG. 4 is a partial sectional view of a conventional permanent magnet rotating electrical machine disclosed in, for example, Japanese Utility Model Application Publication No. 52-155916. In the figure, 1a and 1b are housing pieces, 2 is an embrader, 3 is a rotor, 4 is a bearing, 5 is a flange, and 6 is a permanent magnet.

The rotating electric machine cited as an example of the conventional structure is constructed as described above, and the housing pieces 1a and 1b are A as shown in the figure.
The device is assembled by caulking and fixing the device to the embrar 2 using the protruding pieces provided at the portions B and B.

(Problems to be Solved by the Invention) In the structure of the conventional rotating electric machine as described above, the protruding pieces provided on the housing pieces 1a and 1b are fixed to the embrar 2 by caulking.
There was a problem that the device could not be attached and detached reliably.

This invention was made to solve these problems, and to obtain a machine frame structure for a rotating electric machine that can reduce the number of manufacturing steps and prevent water from seeping into the inside of the yoke of the rotating electric machine. With the goal.

[Means for solving problems]

The machine frame structure of a rotating electric machine according to this invention has a long hole for inserting a through bolt at the bottom of the machine frame, and a structure is established in which the central machine frame and the end machine frame are fastened with through bolts, and the machine frame has a structure in which the machine frame at the center and the machine frame at the end are fastened together with through bolts. A positioning/rotation-preventing fitting protrusion is integrally formed in the elongated hole, and the structure is such that it engages with the end machine frame in a concave-convex manner.

[Effect]

In this invention, an elongated hole for through-bolt insertion is provided at the bottom of the machine frame of the rotating electric machine, and a positioning and rotation-preventing fitting protrusion that engages with the end machine frame in a concave-convex manner is integrally formed in the elongated hole for through-bolt insertion. Therefore, the structure is easy to manufacture and the prevention function is improved.

〔Example〕

FIG. 1 is a half-sectional view of the rear half of an embodiment of this invention applied to an internal reduction starter.
2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a perspective view of the main components of FIG. 1 (or FIG. 2).

In the figure, 7 is an internal reduction starter incorporating a planetary gear reduction device 8, 9 is a front machine frame made of aluminum alloy die-casting material, and a magnetic DC motor 10 is connected to a first spigot part 9a through bolts 11.
It is fastened (screwed) by. Reference numeral 12 denotes a yoke having a bottom part 13 manufactured by deep drawing using a mild steel plate member, and a pole 14 made of a permanent magnet material is attached to the inner circumferential surface of the yoke with resin adhesive or the like. It is worn. Reference numeral 15 denotes an elongated through-bolt insertion hole into which the above-mentioned through-bolt 11 is inserted, and the elongated through-bolt insertion hole 15 is integrally provided with a pressed-out positioning/rotation-preventing fitting protrusion 16. The positioning/rotation-prevention fitting protrusion 16 is fitted into a groove 17 provided in the opening of the front machine frame 9 to prevent rotation. 18 is a rotor (armature), and an iron core 20 and a commutator 21 are mounted on the rotating shaft 19.
is fitted, and the coil 22 is wound and mounted.
23 is a brush holder, 24 is a rear machine frame,
A ball bearing 25 is attached to this, and supports the rear end portion of the rotating shaft 19 described above. 26 is a spur gear mounted on the rotating shaft 19, and a planetary gear 27 is gear-engaged with the spur gear 26. 28 is a sleeve bearing, 29 is a support pin, 30 is a flange formed integrally with the output rotating shaft 31, and 32 is a sleeve bearing 33 that is internally engaged with the planetary gear 27 and supports the output rotating shaft 31. It is an internal gear device that fits into the boss portion 34, and has a flange portion 35 provided on its outer peripheral surface.
is fitted into the second spigot part 36 of the front machine frame 9. Reference numeral 37 denotes a groove that is engaged with the above-mentioned positioning/rotation-preventing fitting protrusion 16 to prevent rotation.

In the machine frame structure of a rotating electric machine configured as described above, a DC power source (not shown) is connected to the brush holder 23, and the coil 22 wound around the rotor 18 is energized and rotated. The rotational force is transmitted to the planetary gear reduction gear 8 via the spur gear 26 on the rotating shaft 19, where the rotational force is strengthened and transmitted to the output rotating shaft 31, causing the engine to rotate. Forced. At this time, the rotational force generated in the yoke 12 and the internal gear device 32 as a reaction is caused by the above-mentioned positioning and rotation-preventing fitting protrusion 16.
It comes into contact with a concave groove 17 provided in the front machine frame 9 and receives pressure. Therefore, by arranging the through bolt 11 and the positioning/locking fitting protrusion 16 as a dowel for positioning in parallel, the number of manufacturing steps can be reduced, and the planetary gear reduction device can be installed inside the yoke 12. It is possible to prevent water from entering from the 8th side.

In addition, in the above embodiment, the case where this invention was applied between the yoke of a DC motor and the opening of the front machine frame was explained, but it can also be applied to the machine frame of a general rotating electric machine. , and similar behavior can be expected.

[Effect of idea]

As explained above, this idea has a long hole for inserting a through bolt in the bottom of the machine frame, and a positioning/rotation-preventing fitting protrusion that is engaged with the front machine frame in a concave and convex manner is integrated into the long hole for inserting a through bolt. With this simple structure, it is possible to position the center machine frame and the front machine frame and at the same time engage them with each other with a locking mechanism, which facilitates manufacturing and improves the prevention function.

[Brief explanation of drawings]

Fig. 1 is a half sectional view of the rear half showing an embodiment in which this invention is applied to an internal reduction starter, Fig. 2 is a sectional view taken along the - line in Fig. FIG. 4 is a perspective view showing the essential parts of the main constituent members in FIG. 4, and FIG. In the figure, 9 is a front machine frame, 10 is a magnetic DC motor, 11 is a through bolt, 12 is a yoke, 13 is a bottom, 15 is an elongated hole for inserting a through bolt, 16 is a positioning/rotation fitting projection, 17 is a concave groove, 18 is a rotor, and 32 is an internal gear device. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a machine frame structure of a rotating electrical machine in which a central machine frame of a rotating electrical machine and a front machine frame are fitted with pilots on the end faces of the central machine frame, a bottom portion provided at a portion where the front machine frame fits into the frame; and a long hole for inserting a through bolt for fastening the center machine frame and the front machine frame provided in the bottom portion; A positioning and anti-rotation fitting protrusion is provided by bending the punched piece of the elongated hole for inserting the through bolt, and a protrusion is provided on the front machine frame so that the positioning and anti-rotation fitting protrusion is interlocked with each other. Machine frame structure of a rotating electric machine equipped with a concave groove. (2) The above-mentioned central machine frame constitutes a yoke of a DC motor, and the above-mentioned front machine frame constitutes a front machine frame of a starter motor. Machine frame structure of the rotating electric machine described in ). (3) The rotation according to claim 1 or 2 of the utility model registration claim, characterized in that an internal gear device of a planetary gear reduction device is narrowly fixed to the spigot fitting part. Electric machine frame structure.