JPH0336941A - Motor bearing unit - Google Patents

Abstract

PURPOSE:To eliminate fluctuation of the rotation of motor by driving a slip washer by means of an anti-through member cooperating with a rotary shaft. CONSTITUTION:An anti-through member 8 arranged, cooperatably with a rotary shaft 7, at the end section projecting from the sliding bearing 6 of the rotary shaft 7 is provided with a protrusion 8a in the radial direction and the protrusion 8a is engaged with an axial protrusion 9a arranged on a washer 9. The rotary shaft 7, the anti-through member 8 and the washer 9 are arranged to rotate together when they are fixed. Since the slip washer is driven by means of the anti-through member, the coupling condition is not important, and the rotation of motor is not fluctuated by the variation of the coupling condition nor the frictional sliding noise is produced.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applicable to applications in which a rotating shaft of a rotor is supported using a sliding bearing fixed to a bearing holder provided in a frame of a stator, for example, for an axial fan. This invention relates to a bearing device for an electric motor.

[Prior Art] Figure 4 is a sectional view showing a conventional electric motor disclosed in Japanese Utility Model Application Publication No. 55-117160. (3) is a stator consisting of a stator core (4) fitted on the outer peripheral surface of this bearing holder and a winding (5) wound around it; (6) is a stator that includes a 2) is a sliding bearing made of oil-impregnated sintered alloy, for example, (7) is a rotating shaft that is supported through this sliding bearing, and (8) is a sliding bearing of this rotating shaft from the sliding bearing (6). (9) a retaining member attached to the protruding end so as to cooperate with the protruding end;
is this retaining member and the above-mentioned belly bearing (
A washer (lO) is provided between the opposite end face of the rotary shaft (7) and rotatably held with respect to the rotary shaft (7), and is fixed to the other end of the rotary shaft (7) and is attached to the stator (3). ) is a rotor having a magnet (11) facing the outer peripheral surface of the rotor.

The conventional electric motor is constructed as described above, and a magnetic field is generated by energizing the winding (5), and the rotor (10) is moved around the rotating shaft (
7), and the retaining member (8) that operates together with this rotating shaft also rotates, but the above-mentioned slip washer (9)
) may or may not rotate together depending on the thrust of the rotating shaft at that time.

[Problems to be Solved by the Invention] In the conventional electric motor having the above configuration, the slip washer may or may not slide against the retaining member, causing a change in frictional resistance, which causes variations in the rotational speed of the motor. There was a problem. Further, when the retaining member and the veri washer slide, there is a problem in that they are worn out and a sliding noise is naturally generated.

It is an object of the present invention to always keep the connection state of the sliding washer to the above-mentioned slip-off prevention member constant, so that there is no variation in the rotational speed of the electric motor.

[Means for Solving the Problems] In the bearing device for an electric motor according to the present invention, the bell washer is driven by the retaining member that moves together with the rotating shaft.

[Function] In the bearing device for the electric motor of the present invention, since the slip washer also rotates together with the rotation shaft, the frictional state between the slip washer and the retaining member is stabilized to a constant state, and therefore there is no variation in the rotational speed during the rotation of the electric motor. does not appear.

[Example] An example of the present invention will be described below. That is, in FIGS. 1 and 2, parts that are the same as or equivalent to those in the conventional one shown in FIG. The retaining member (8) of the present invention, which is provided at the protruding end of the shaft so as to move together with the rotating shaft, is provided with a convex portion (8a) in the radial direction. ) is engaged with the axial protrusion (9a) attached to the slip-off washer (9), and when these are installed, the rotating shaft (7), retaining member (8), and slip-off washer (9) are all engaged. The feature of this invention is that it rotates.

FIG. 3 shows another embodiment in which a plurality of resin flat washers (12) are inserted between a metal sliding washer (9) and the opposing surface of a sliding bearing (6) facing it. FIG. 3 is an enlarged sectional view of the main parts shown. By the way, the above-mentioned slip washer (9) may be made of resin with good sliding properties in addition to being made of metal.

Other means for engaging the retaining member and the bell washer are as follows:
It is not limited to the means shown in FIG. 2, as long as the rotation of the retaining member is transmitted to the bell washer.

[Effects of the Invention] As described above, in the bearing device for an electric motor of the present invention, the protruding end of the rotating shaft from the sliding bearing is fixed by the retaining member provided so as to move together with the rotating shaft. Since the veri washer inserted between the facing surfaces of the verri bearing is driven, there is no change in the coupling state between the two, and therefore, the rotation of the motor due to the above-mentioned change in the coupling state while the motor is rotating. This has the effect that there will be no variation in the number of parts, and that there will be no sliding noise caused by friction between the two parts.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a bearing device for an electric motor according to the present invention, and FIG. 2 is a perspective view of the main parts thereof. FIG. 3 is an enlarged sectional view of the main part of FIG. 1, and FIG. 4 is a vertical sectional view showing a conventional electric motor. In the figure, (1) is the frame, (2) is the bearing holder, and (3) is the frame.
) is the stator, (6) is the helical bearing, (7> is the rotating shaft, (
8) is a retaining member, (9) a beveled washer, (lO
) is a rotor. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a device that supports a rotating shaft of a rotor using a sliding bearing fixed to a bearing holder provided in a frame of a stator, an end portion of the rotating shaft protruding from the sliding bearing is attached to the end of the rotating shaft that moves together with the rotating shaft. A bearing device for an electric motor, characterized in that the retaining member is provided, and a sliding washer driven by the retaining member is interposed between the retaining member and an opposing end surface of the sliding bearing facing the retaining member. .