JPH0259012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor shaft for a general-purpose generator, and more particularly to a method for manufacturing a rotor shaft for a small-sized generator that can be transported and moved.

[Conventional technology]

Conventionally, the rotor shaft 1 consists of a head 2, a body 3, and a middle body 4, and a fitting such as a bearing (not shown) for fitting a bearing is provided at the tip of the middle body 4. Five parts of the mating shaft had been processed by cutting. In processing the shaft 1, when cutting each of the body part 3, middle body part 4, and fitting shaft 5,
Since the thickness requires at least the outer diameter of the head 2, the material yield rate is very low. Additionally, processing time costs were also a cause of soaring prices. In addition, cutting has the disadvantage that it is difficult to achieve uniform product quality.

Furthermore, even if the head 2 is entirely machined from a material having the thickness of the body 3 by hedging, the thinnest fitting shaft 5 and the middle body 4 will undergo a severe diameter reduction process. , the fitting shaft 5 and the middle body part 4 must be finished by cutting. A hole 6 is formed in the shaft 1 so as to penetrate from the head 2 to the fitting shaft 5. On one side of this hole 6, a hole 7 and a tapered hole 8 are formed to fit a drive shaft (not shown), and on the other side, a female thread 9 is carved into the inner diameter of the fitting shaft 5, and a female thread 9 is formed on the other side. is used when fitting a bearing onto the fitting shaft 5, when fitting a drive shaft from one side, or when disassembling the bearing. Therefore, having the hole 7 in the center of the shaft 1 is a serious issue in terms of quality. That is, as a rotor shaft, a winding rotor (not shown) is fixed to the shaft 1 and rotates, so if there is no hole 7 in the center, center runout will occur, and the bearing will cause uneven wear. This causes early rattling, and the vibration also causes noise. However, compared to the diameter of the hole 6 of the shaft 1, its length is long, and normally if the length of the hole 6 is five times or more the diameter, the drill will bend to one side during machining and become eccentric, resulting in uneven thickness. They penetrate through the holes and reduce the value of the product. Also, during hole drilling,
When the length of the hole is long, the cutting oil does not reach the tip of the drill sufficiently, which often causes seizure and reduces machining efficiency.

Furthermore, in order to attach a rotor for power generation to the shaft 1, the rotor and the shaft 1 are fixed with an insulator sandwiched between them, and the body 4 is knurled like a knurling process. This increases frictional resistance. However, since the rotor is made of windings, it is surprisingly heavy, and over relatively shallow irregularities such as knurling, the frictional resistance with the insulator gradually deteriorates, which may cause co-rotation. The joint rotation is
This makes it impossible to use it as a generator.

On the other hand, in order to fix the slide ring that the slide brush comes into contact with, the middle body part 4 is knurled in the same manner as described above, and the slide ring is fitted and fixed therein. The rotor shaft 1 not only serves as a shaft, but also has an important role in power generation.

[Summary of the invention]

The present invention has been made in view of the above-mentioned circumstances, and involves wrapping a rotor shaft used in a general-purpose generator around the rotor shaft, fixing an insulator sandwiched between the rotor shaft and the rotor, and fixing the insulator between the rotor shaft and the rotor. The objective is to mass-produce shafts with uniform quality by also fixing the ring.

In other words, a pipe material having a predetermined outer diameter and inner diameter is cut into a certain length as a material, a core metal that fits the inner diameter of the material is inserted into the material, and the material is hedded and upturned for heading. In a method for manufacturing a rotor shaft for a general-purpose generator, in which the head, body, middle body, and a fitting shaft with a small diameter at the other end are integrally formed to form a stepped hollow shaft, as the second material. A fitting hole and a tapered hole are cut and finished on the formed head, and gear-shaped grooves are formed on the outer periphery of the body and middle body of the second material in the longitudinal direction of the shaft. Features.

[Effect]

Based on the above structure, gear-shaped striations as shown in FIG. 5 are formed on the shafts of the trunk and middle trunk by serration processing, as shown in FIG.
The striations are formed in the longitudinal direction of the shaft and in the direction perpendicular to the rotation of the shaft.
Frictional resistance becomes stronger. Since the fitting hole and the tapered hole are finished by cutting, distortion due to plastic deformation is eliminated and the center relative to the shaft is maintained.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5. First, a material A is obtained by cutting a pipe material having a constant outer diameter a and a constant inner diameter b into a constant length. A core metal that fits into the inner diameter b of this material A is inserted, and the extrusion pin fixed to the core metal is pushed into the die from one end of the material A (the extrusion pin and die have a mold, not shown). The shaped head part 2, body part 3, middle body part 4, and fitting shaft 5 are formed so as to contract. At this time, especially the head 2
The hole 6 is formed to be thicker than the original material A, and the hole 6 is formed as a uniform hole 6 to fit a certain fitted core metal. One end of the head 2 is pressed by an extrusion pin, and the other end is received within the die by a knockout pin, so each end becomes a second material B with a planar finish. now,
This material A is helded from the head 2 side and upset processed, so the material elongates on the mating shaft 5 side.
If the length of the fitting shaft 5 becomes long, cut it again at the end of the fitting shaft 5, insert the core metal into the hole 6, push it in from the head 2 as described above, ，
The middle body part 4 and the fitting shaft 5 are upset to form an extrusion pin that comes into contact with the head 2 and the fitting shaft 5.
Push out with a knockout pin that abuts the end of the
Correct both ends to constant dimensions. In this processing, if there is a large difference in the outer diameter of each part, hot processing is performed. In addition, if there is not much difference in the outer diameter of each part, bonderite treatment (May 30, 1970)
(Japanese) Published by Nikkan Kogyo Shimbun, edited by Matsuo Miyagawa, ``Illustrated Press Processing Dictionary'', p. 184 and 290. A process in which phosphate is added to Parkerizing liquid to create a film, which causes the workpiece to slide into the mold. (used to improve the process) and then cold worked. In this case, cold working is more desirable than hot working if possible. For example, in an automobile, a shallow fitting hole 7 is formed in the head 2 of the material B, and a tapered hole 8 is formed next to the hole 7 by cutting, in order to transmit the rotation of the crankshaft. It is possible to form the holes 7 and 8 at the same time during processing, but the precision of each hole 7 and 8 is stricter than that of the hole 6, and moreover, the core metal bites into the tapered hole 8, making it difficult to remove. This can cause work to be interrupted or the core metal to break during the process, so it is finished by cutting. Further, a female thread 9 is carved into the inner diameter of the fitting shaft 5 at the other end.

Furthermore, as shown in FIG. 5, the outer peripheries of the trunk 3 and middle trunk 4 are gear-shaped and have long striations in the longitudinal direction of the shaft 1.
By performing the serration process so that it digs in and protrudes more, the product is completed by providing the striations 10.

〔Effect of the invention〕

As described above, in the present invention, a pipe material having a predetermined outer diameter and inner diameter is cut into a certain length to be used as a material, and a core bar that fits into the inner diameter of the material is inserted into the material. A method for producing a rotor shaft for a general-purpose generator, in which the head, body, and middle body are integrally formed with a fitting shaft whose other end has a small diameter by upsetting and heading together with hetting processing to form a stepped hollow shaft. A fitting hole and a tapered hole are cut and finished in the head formed as a second material, and gear-shaped grooves are formed on the outer periphery of the body and middle body of the second material in the longitudinal direction of the shaft. , the yield rate of the material is improved. The accuracy of the fitting hole and the tapered hole with respect to the outer diameter of the shaft is improved, and no vibration of the shaft occurs. The striations protrude like gears in the longitudinal direction of the shaft and are concave grooves, so even if coated with a synthetic resin such as FRP, the striations will be parallel to each other at right angles to the rotating shaft. Because of this, the frictional resistance is high, and the rotor and slide ring can be firmly integrated with the synthetic resin used as the insulator, making it possible to withstand long-term use.

Furthermore, in the finished product, a fiber pattern is formed in the longitudinal direction on the outer periphery of the shaft, which promotes the hardening characteristic of forging and forging, and densifies the structure. In addition, each hole penetrates through the shaft in a central direction, and uneven thickness does not occur. In addition, by shortening processing time, production costs can be significantly reduced, and the performance as a rotor shaft can be improved and manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is an external side view of the rotor shaft according to the present invention, Fig. 2 is a cross-sectional view of the same, Fig. 3 is an external side view of material A obtained by cutting it from a pipe material, and Fig. 4 is an external side view of the rotor shaft obtained from material A. 5th external side view of the second material
The figure is a sectional view taken along the line XX in FIG. 1. 1...(rotor) shaft, 2...head, 3...body, 4...middle body, 5...fitting shaft, 6...hole, 7...(fitting) hole, 8...tapered hole, 9...female thread, 10...
Streaks, A...Material, B...Second material.

Claims (1)

[Claims] 1 Pipe material with a specified outer diameter and inner diameter,
A material is cut to a certain length, a core metal that fits into the inner diameter of the material is inserted into the material, and the material is upturned and pressed together with a hedging process to form the head, body, middle body, etc. In a method for manufacturing a rotor shaft for a general-purpose generator in which a fitting shaft with a small diameter end is integrally formed and a stepped hollow shaft is formed, a fitting hole and a tapered hole are cut in a head formed as a second material. A method for manufacturing a rotor shaft for a general-purpose generator, characterized in that gear-shaped grooves are formed in the longitudinal direction of the shaft on the outer periphery of the body and middle body of the second material.