JPS61285047A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To enable the right angle degree of the shaft end on the load side to the end face on the load side, to be easily shown at a high precision, by providing the both ends of the shaft with center holes, and by processing the end face of a bearing bracket on the load side based on the center holes. CONSTITUTION:Center holes 1b, 1c having concentricity with the outer diameter of a shaft 1 are bored through the both ends of the shaft 1. After a bearing bracket 2 on the load side and a bearing bracket 7 on the counter-load side are fitted at both ends of the shaft 1, the end face 2a on the load side of the bearing bracket 2 on the load side is processed on the basis of the center holes 1b, 1c. As the result, the right angle degree of a shaft center to the end face 2a on the load side can be shown at a high precision, and the process can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotating electric machine that rotates with high precision and high speed.

[Technical background of the invention and its problems] The conventional method will be explained using FIGS. 5 and 6. Fifth
The figure is a new front view of a rotating electrical machine, and Figure 6 is Vl-V of Figure 5.
FIG. The rotor 6 is press-fitted into the shaft 1 and rotatably attached to the load side ball bearing 3 and the anti-load side ball bearing 8.

The load-side ball bearing 3 is held by the load-side bearing bracket 2, which is fitted with a rabbet 2b of the load-side bearing bracket and a load-side rabbet 4a of the frame. Similarly, on the anti-load side, the rabbet 7a of the ring bracket and the anti-load side rabbet 4b of the frame are fitted. The stator core 5 and the rotor core 6 press-fitted into the frame 4 maintain a proper air gap and form a rotation In. For example, a gear or other transmission equipment is attached to the load-side shaft end 1a of the shaft, and the casing of the transmission equipment, etc.
When fixing the end face 2a of the load-side bearing bracket to
(within 3 trm) If not strictly maintained, high-speed rotation [1] will cause a large amount of vibration. In order to prevent this, one method is to check the concentricity of the rabbets 2b of the load-side bearing brackets 1 and 2, the housing hole of the load-side ball bearing 3, and the load-side bearing bracket end 2a; The concentricity of the rabbet 7a of the frame 5 and the anti-load side ball bearing 8, and the concentricity of the load side rabbet 4a of the frame 5 and the anti-load side rabbet 4b are calculated to be within the target accuracy (here, 0.03 seconds).
), and it is difficult to keep the total to this accuracy using current normal processing methods. Therefore, in manufacturing these rotating M machines, each part is processed using normal processing methods to achieve normal processing accuracy, and then the main parts of the rotating electrical machine are assembled as shown in Figure 5. 11 is attached to the load-side shaft end 1a with the V-block magnet 11 as a reference, and the dial gauge 12
Attach the probe to measure the end surface 2a of the load side bearing bracket, rotate the shaft 1, and the reading on the dial gauge 12 indicates the target accuracy (here 0.03 m+)
I fixed it by hitting it with Hammer 13 so that it was within the range.

Furthermore, if the accuracy could not be corrected even with Hammer 13, it would be disassembled again and the parts would be reworked.

In this way, with the conventional method, it is extremely unstable to ensure the perpendicularity between the load side shaft end 1a and the load side bearing bracket end face 2a, and because it is a trial-and-knocker, it often relies on the intuition of the operator, resulting in poor product accuracy. There were large variations in the results, and a lot of work time was required. Moreover, since it is hit with hammer 13, the load side,
Ball bearings 3.8 on the anti-load side were also experiencing problems such as ball dents and cracks.

[Purpose of the Invention] The present invention was carried out to overcome the drawbacks of the conventional method, and is to easily and precisely adjust the perpendicularity between the load-side shaft end and the load-side bearing bracket end face with high precision (here, within 0.03M). To provide a rotating electric machine which can be obtained without fear of damage to each part.

[Summary of the Invention] The end face of the load-side bearing bracket is machined using center holes provided at both ends of the shaft to obtain a predetermined squareness.

[Embodiments of the invention] The structure of the invention will be explained with reference to FIGS. 1 to 4.

However, parts that are the same as those in the prior art will be described using the same reference numerals.

FIG. 1 is a front view including a partial cross section of a rotary FFI machine showing an embodiment of the present invention, in which a shaft 1 is rotatably attached to a load side bearing bracket 2 via a load side ball bearing 3, and a load side bearing The rabbet 2b of the bracket is fitted with the load-side rabbet 4a of the frame. A stator core 5 is press-fitted into the frame 4, and is attached to the frame 4 so that an appropriate air gap can be maintained between it and the rotor core 6, which is press-fitted into the shaft 1. The anti-load side rabbet 4b of the frame 4 is fitted with the rabbet 7a of the anti-load side bearing bracket 7, and the anti-load side bearing bracket 7 is rotatably attached to the shaft 1 via a ball bearing 8. Furthermore, center holes 1b and 1C remain at both ends of the shaft 1, which served as references when machining the outer diameter of this shaft. Further, the load side bearing bracket 2 has a load side end face 2a, which forms a reference when attaching the rotating electric machine.

Examples of machining of the rotation ff1lfi are shown in FIGS. 3 and 4.

FIG. 4 is a view taken along the line IV-IV in FIG. 3.

The center hole 1C on the anti-load side is rotatably fixed to the drive disk 18 via the drive-side center 17, and the anti-load side bracket 7 hits the rubber 14 via the rubber holder 15 and the rubber mounting plate 16, and is rotatably fixed to the drive disc 18 via the drive-side center 17. It is fixed to the disk 18 and allows the main body of the rotating electric machine except for @1 to rotate. Further, the center hole 1b on the load side is held by the center 19 on the driven side.

Further, a bearing roller 20 rotatably attached to a block 21 is in contact with the load side shaft end 1a.

In order to process the load side end surface 2a, an air rotary tool 23 rotated by compressed air supplied from an air hose 24 is provided horizontally perpendicular to the axis of the rotating electrical machine.
The processing tool 22 is attached to the tip.

Next, the processing method will be explained. Hole 1b to load side center
The shaft 1 whose outer periphery is machined with reference to the center hole 1C on the opposite load side should maintain its concentricity unless bending occurs during the process. If the rotary shaft electric machine main body is rotated in the direction of arrow Z in FIG. A load-side end surface 2a with a high load side can be obtained.

The load side end 2a obtained in this way is completely unaffected by the rabbets of the load side bearing bracket 2, frame 4, anti-load side bearing bracket 7, and the concentricity of the housing hole of the ball bearing, and is highly accurate. can get.

Further, the bearing roller 20 plays a role of preventing chatter from occurring by rotating the rotating electric machine body. When machining the load side end face 2a, the machining allowance is extremely small (for example, within 0.1111), and the machining tool 22 is also a grinding wheel or the like dressed in a direction perpendicular to the axis 1, thereby obtaining a good finished surface and perpendicular accuracy. , reducing cutting resistance and preventing deformation and damage to the motor body.

As mentioned above, by performing all machining according to a certain standard, it is possible to easily obtain a motor with a highly accurate squareness. In addition, this method does not require the use of a special processing machine, and can be processed using an ordinary lathe by making a simple jig.

[Effects of the Invention] As described above, since mechanical processing can be performed according to a fixed standard, a highly accurate perpendicularity between the load-side shaft end and the load-side end face can be easily obtained without any variation between products, allowing for high-speed rotation. This greatly contributes to the suppression of imaging after installation into imaging equipment.

Furthermore, since the end face on the load side is machined with a light load, it is possible to prevent harmful damage caused by conventional hammering.

[Brief explanation of drawings]

Fig. 1 is a front view including a partial cross section of a rotating electrical machine showing an embodiment of the present invention, Fig. 2 is a side view in the direction of the m/-m line arrow in Fig. 1, and Fig. 3 is a detailed view of the present invention. FIG. 2 is a side view of the explanatory diagram in the direction of the arrows ``■-■''. 1... Shaft, 1a... Load side shaft end, 1b... Load side center hole, 1C... Anti-load side center hole, 2... Load side bearing bracket, 2a...
・Load side end face, 7... Anti-load side bearing bracket. Agent Patent Attorney Kensuke Chika (one idiot) Figure 1 Figure 2 Figure 5 Figure 4 Figure 6 Figure 6

Claims (1)

[Claims] After assembling a rotating electric machine using the above parts, a center hole that is concentric with the shaft outer diameter provided at both ends of the shaft, a bearing bracket that clamps both ends of this center hole at the center, and then using both ends of the center hole as a reference. A rotating electrical machine characterized by having a machined end face of a load-side bearing bracket.