JPH0242061Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a geared reversible electric motor that rotates in both forward and reverse directions, and particularly relates to improvements in the bearing portion thereof.

[Conventional technology]

An example of the configuration of a conventional electric motor of this type is shown in FIG. In the figure, reference numeral 1 denotes a housing, and this housing integrally has a bearing boss portion 1d and a gear box 1c protruding on the opposite side from the bearing boss portion. A stator 2 having a structure in which an armature coil 2b is wound around an iron core 2a is supported on the outer periphery of the bearing boss portion 1d. A load-side bearing 4 and a drive-side bearing 4' are fitted inside the end of the bearing boss 1d closer to the gearbox 1c and the end opposite to the gearbox, respectively, and these bearings rotate the rotating shaft 3. freely supported.

The rotating shaft 3 has a gear part 7 such as a helical gear at one end, and the gear part 7 is connected to the gear box 1c.
The inner rings 4a and 4a' of the load-side bearing 4 and the drive-side bearing 4' are press-fitted into the inner rings 4a and 4a', respectively. A bowl-shaped iron rotor yoke 6 is attached to the other end 3a of the rotating shaft 3.
The yoke 6 is arranged so that its peripheral wall concentrically surrounds the stator 2, and a permanent magnet 8 is attached to the inner periphery of the peripheral wall of the yoke 6. A rotor 9 is constituted by the yoke 6 and the magnets 8, and the magnetic poles of the rotor are arranged opposite to the magnetic pole portions of the stator 2 with a predetermined gap interposed therebetween.

The inner ring 4a of the load-side bearing 4 is fixed to the rotating shaft 3 by a snap ring 5 fitted in a groove formed in the rotating shaft 3. Further, one end of the outer ring 4b of the load-side bearing on the rotor 9 side is brought into contact with the bearing contact portion 1a formed in the housing 1, and the outer ring 4b is brought into contact with the bearing contact portion 1a formed in the housing 1.
b movement toward the rotor 9 side is restricted. Furthermore, a snap ring 10 for fixing the outer ring is fitted into a groove 1b provided in the housing 1, and the snap ring 10 is brought into contact with the side surface of the other end of the outer ring 4b, and the snap ring locks the gear box 1 of the outer ring 4b.
Movement to the c side is restricted.

A snap spring 5' fitted in a groove formed in the rotating shaft 3 is brought into contact with the side surface of the inner ring 4a' of the drive side bearing 4', and this snap spring 5' pulls the inner ring 4a' toward the rotor side. Movement is restricted.

A gear 11 constituting a transmission is housed in the gearbox 1c together with a gear portion 7 provided on the rotating shaft 3, and an output shaft 13 of the transmission is led out to the outside from a gearbox cover 12 that closes an end of the gearbox. There is. The output of the electric motor is reduced or increased in speed by a transmission and then transmitted to the output shaft 13.

The main body of the electric motor, which consists of a rotating shaft 9 and a stator 2, is covered with a cup-shaped cover 1 fixed to a housing 1.
Covered by 4.

[The problem that the idea attempts to solve]

As mentioned above, in a reversible electric motor equipped with gears, thrust forces in both forward and reverse directions act on the rotating shaft. Movement of the outer ring 4b toward the gearbox is regulated by restricting movement toward the rotor and by bringing a snap spring 10 attached to the housing into contact with the outer ring 4b.

However, if the structure is such that the movement of the outer ring 4b of the load-side bearing toward the gearbox 1c is restricted by the snap spring 10 attached to the housing 1, it is necessary to form a groove 1b in the housing 1 by boring into which the snap spring 10 is fitted. Therefore, there was a problem that the processing was extremely troublesome and the manufacturing cost was high.

An object of the present invention is to provide a reversible electric motor that can restrict movement of the outer ring of the load side bearing toward the gearbox side without performing troublesome boring work on the housing.

[Means to solve the problem]

As shown in FIG. 1 showing an embodiment of the reversible electric motor to which the present invention is directed, a bearing boss portion 1
d and a gearbox 1c protruding on the opposite side from the bearing boss, a stator 2 supported on the outer periphery of the bearing boss 1d, an end side of the bearing boss 1d closer to the gearbox, and A load side bearing 4 and a drive side bearing 4' are respectively positioned on the opposite end side of the gear box and fitted inside the bearing boss portion, and a gear portion 7 is provided at one end of the bearing boss portion. The rotary shaft 3 is press-fitted into the inner rings 4a and 4a' of the load side bearing 4 and the drive side bearing 4', respectively, while the rotary shaft 3 is positioned in the gearbox.
A rotor 9 is attached to the other end and reversibly drives the rotating shaft. Inner ring 4 of load side bearing 4
a is fixed to the rotating shaft 3 by a snap spring 5, and one end of the outer ring 4b of the load-side bearing 4 on the rotor 9 side is brought into contact with a bearing abutting portion 1a formed in the housing, and the rotor of the outer ring 4b is Movement to the side is restricted.

The present invention makes it possible to restrict the movement of the outer ring of the load-side bearing in such an electric motor without using a snap spring.
A stopper member 15 is provided in the gearbox 1c and is disposed with a gap between the outer ring 4b of the load side bearing 4 and faces the side surface of the other end of the outer ring 4b of the load side bearing 4 in a non-contact state, and the stopper member 15 is attached to the housing. It is characterized by being fixed against the

[Effect]

When the stopper member 15 is provided as described above, there is no need to attach a snap ring to the housing, so there is no need to perform boring on the housing, and the manufacturing cost of the reversible electric motor can be reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG.

FIG. 1 shows the main parts of an embodiment of the present invention, and in this figure, the same parts as those in FIG. 2 are given the same reference numerals. In the electric motor of this embodiment, a plurality of stopper members 15 are attached to the inside of a cover 12 that closes the open end of a gearbox 1c provided in the housing 1. Each stopper member 15 is arranged at a distance from the gear part 7 of the rotating shaft so as not to come into contact with the gear part 7, and one end thereof is fixed to the gear box cover 12 by a screw 16. Each stopper member 1
5 extends toward the load-side bearing 4 in parallel with the rotating shaft 3, and the end surface of the tip 15a is connected to the side surface of the other end of the outer ring 4b of the bearing 4 through a predetermined gap d (non-contact). ) are placed opposite each other. The other configurations are similar to the example shown in FIG.

As mentioned above, if the stopper member 15 is provided in the gearbox 1c and the stopper member is opposed to the side surface of the outer ring 4b of the load side bearing in a non-contact state, there is no need to attach a snap ring for fixing the outer ring as in the conventional case. Also, the movement of the outer ring 4b can be restricted. Therefore, it is not necessary to form a groove for attaching the snap spring in the housing by boring, so there is no need to perform complicated machining on the housing, and manufacturing costs can be reduced. The stopper member 15 can be easily installed because it can be placed inside the gearbox and fixed by appropriate means. Therefore, the load-side bearing 4 can be easily fixed against thrust force.

Further, in this embodiment, a plurality of stopper members 15 are screwed to the gearbox cover 12 in advance, and each stopper member 15 can be secured by simply screwing the gearbox cover 12 to the open end of the gearbox 1c of the housing. Positioning can be easily performed all at once.

In the above embodiment, each stopper member 15 is attached to the gearbox cover 12 that closes the opening of the gearbox 1c, but the present invention is not limited to this. For example, each stopper member 15 is attached to the gearbox cover 12. It can also be formed integrally with 12.

[Effect of idea]

As described above, according to the present invention, the stopper member, which is disposed with a gap between it and the gear part of the rotating shaft and faces the side surface of the other end of the outer ring of the load side bearing in a non-contact state, is attached to the housing. Since the movement range of the outer ring of the load side bearing on the gearbox side is restricted by fixing the outer ring to the outer ring, there is no need to provide a snap ring for fixing the outer ring. Therefore, it is not necessary to form a groove for attaching the snap spring in the housing, so there is no need to perform troublesome boring into the housing, and the manufacturing cost of the electric motor can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention, and FIG. 2 is a partially sectional front view of a conventional electric motor. 1...Housing, 1a...Bearing contact part, 1c
...Gearbox, 1d...Bearing boss part, 2...
Stator, 3...Rotating shaft, 4...Load side bearing, 4a
...Inner ring, 4b...Outer ring, 4'...Drive side bearing,
4a'...Inner ring, 4b'...Outer ring, 5, 5'...Snat spring, 7...Gear section, 9...Rotor, 15
...Stopper member.

Claims (1)

[Claims for Utility Model Registration] A housing 1 that integrally includes a bearing boss portion 1d and a gear box 1c protruding on the opposite side from the bearing boss portion, and a stator 2 supported on the outer periphery of the bearing boss portion of the housing. , a load-side bearing 4 and a drive-side bearing 4' that are fitted inside the bearing boss and are respectively positioned at an end of the bearing boss 1d closer to the gearbox and an end opposite to the gearbox. and a rotating shaft having a gear portion 7 at one end and press-fitted into the inner rings 4a and 4a' of the load side bearing 4 and the drive side bearing 4', respectively, with the gear portion positioned inside the gear box. 3, and a rotor 9 attached to the other end of the rotating shaft 3 to reversibly drive the rotating shaft, the load side bearing 4
The inner ring 4a of the load side bearing 4 is fixed to the rotating shaft 3 by a snap spring 5, and the outer ring 4a of the load side bearing 4
In the reversible electric motor, one end of the outer ring 4b on the rotor 9 side is brought into contact with a bearing contact portion 1a formed in the housing to restrict the movement of the outer ring 4b toward the rotor side, wherein the gear of the rotating shaft A stopper member 15 is disposed with a gap between the stopper member 15 and the stopper member 15 and faces the side surface of the other end of the outer ring 4b of the load side bearing in a non-contact state.
A reversible electric motor characterized in that a stopper member is provided in the gearbox 1c and the stopper member is fixed to the housing.