JPS5840771Y2 - Motor with washer damper - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an excellent motor for sound-deadening young fruit.

BACKGROUND ART Conventionally, particularly in motors such as inductor-type synchronous motors in which the rotor moves in steps, an important issue has been how to reduce the noise generated between the rotor shaft and the bearing.

For example, as shown in FIG. 1, the upper case 3 and/or A bearing part (5 is a grease reservoir provided near the bearing part) provided in the lower case 4 is covered with a lid 3at4a made of plastic or the like.

), and the upward movement of this rotating shaft 1a is controlled by known means, such as attaching an E-ring or forming a stepped portion to engage a part of the upper case 3. In the conventional type inductor type motor, in which the downward movement is similarly restrained by It was not possible to prevent the vehicle from colliding with the wall of the hole and causing noise.

However, in order to rotate smoothly with the rotor, there must be a gap of an appropriate size between the rotating shaft 1a and the bearing hole, but it is impossible to fix the bearing holes in the upper and lower cases so that their centers are completely aligned. Since this is almost impossible due to manufacturing technology, in practice the diameter of the bearing hole should be increased to account for the misalignment of the upper and lower cases, and as a result, the noise caused by bumping and sliding as the motor rotates increases. Because it does.

Conventionally, in order to eliminate the above drawbacks, methods such as attaching an automatic alignment mechanism or performing sizing processing after temporary assembly of the case were adopted, which resulted in a large number of parts, or increased processing man-hours and assembly. The disadvantage was that it increased the number of man-hours and the cost of manufacturing the motor.

In view of the above, the present invention was devised for the purpose of eliminating the drawbacks of conventional products.A grease reservoir is provided near both bearing holes of the motor case, and a hole with a diameter smaller than the diameter of the above-mentioned bearing holes is provided on the rotating shaft. It is an object of the present invention to provide a motor having a novel structure in which a washer having the above-mentioned grease is fitted and the washer is installed in the grease reservoir.

The present invention will be explained below with reference to a drawing (FIG. 2) showing a preferred embodiment in which the present invention is implemented in an inductor type synchronous motor.

In the figure, 6 is a rotor made of a permanent magnet, and 6a is a rotating shaft of the rotor.

A stator 7 is fixed to an upper case 8 and/or a lower case 9 of the motor, and is configured to generate an alternating magnetic field by means of a coil (not shown).

10 and 11 are grease reservoirs formed near the bearing hole 8a of the upper case 8 and near the bearing hole 9a of the lower case 9, filled with a lubricant such as grease oil, and a lid 8b made of plastic or the like; It is covered with 9b.

Further, in the drawings, the upward movement of the rotating shaft 6a is restrained by well-known means such as an E-ring (not shown), similar to the above-mentioned conventional one, and the downward movement is similarly restrained, or by a lid. Suppressed by 9b.

Reference numerals 12 and 13 designate washers having through holes formed therein for the rotating shaft of the rotor.

The washer is made of a material, such as fluorocarbon resin, which has excellent wear resistance, oil resistance, and heat resistance, and has low frictional resistance.

Bearing hole 8a of upper case 8 and lower case 9
The diameter of the bearing hole 9a is made somewhat larger than the diameter of the rotating shaft 6a, taking into consideration the misalignment that occurs when the upper and lower cases are assembled, and the diameter of the through holes in the washers 12 and 13 is made to be slightly larger than the diameter of the rotating shaft 6a. The bearing hole 8a is slightly larger than the diameter of the shaft 6a, and
It is formed smaller than the diameter of 9a.

For example, if the diameter of the rotating shaft 6a is Q, 8 mm, the diameter of the bearing holes in the upper and lower cases is 0.835 to 0.815.
It is desirable that the diameter of the through hole of the washer be approximately 0.815 to 0.805 mm.

The motor of the present invention is composed of the above-mentioned parts, and therefore the number of parts is only increased in number of washers compared to the conventional simplest model shown in Fig. 1. It has been pointed out that the first advantage of this motor is that it has a simpler structure, requires fewer assembly and processing steps, and lower manufacturing costs than the improved motor.

Now, in the case of the inductor type monitor of the above embodiment, since the rotor 6 rotates intermittently for each pole, a force is obtained that moves the rotor in a direction perpendicular to its center of rotation. Washer 12,1 closer to the soot
It collides with the wall of the through hole No. 3 and then moves along with the washer.

In the above, the washers 12 and 13 are made of a material such as Teflon as described above, and the washers are buried in grease, which acts as a damper, so that the rotating shaft 6a penetrates through the washers 12 and 13. Even if you collide with the wall of the hole,
The volume of impact noise or sliding noise caused by this is very small, and even if the rotating shaft 6a eventually hits the bearing holes 8a and 9a in the upper and lower cases, the energy of the collision will be absorbed by the above-mentioned grease. Since it is weakened by the effect, the generated sound volume will be extremely small.

As mentioned above, the second advantage of the motor of the present invention is that the noise generated during rotation is small.

In addition, it is possible to provide washers 12 and 13.
Of course, this is effective in stabilizing the rotation of the.

Incidentally, in the above embodiment, an inductor type synchronous motor has been described, but the present invention can of course be applied to other types of motors.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional inductor type synchronous motor, and FIG. 2 is a sectional view of an embodiment of the present invention. 1... Rotor, 1a... Rotating shaft, 2
...Stator, 3...Top case, 4
...Lower case, 5...Grease reservoir, 6
...Rotor, 6a...Rotating shaft, 7.
...Stator 8...Upper case, 9.
...Lower case, 10, 11...Grease reservoir, 12,13...Washer.

Claims (1)

[Scope of utility model registration request] A lubricant reservoir filled with lubricant is provided in the vicinity of the bearing hole of the case through which the rotating shaft of the rotor passes, and a lubricant reservoir is provided on the rotating shaft with a lubricant reservoir formed of 7-Tun resin or the like, with a diameter less than the diameter of the bearing hole. A motor with a washer damper, characterized in that a washer having a hole is fitted therein, and the washer is immersed in the lubricant.