TW554361B - Rotating electrical component - Google Patents

Abstract

The purpose of the present invention is to provide the rotating electrical components, in which the assembling work can be easily and accurately carried out without using high-accuracy positioning jigs by contriving the shape of the rotating body. The invention is provided with the followings: an operating shaft 12, which can be rotatably supported by the fixing member 5; and the rotating body 8, which is mounted to the operation shaft 12 and is capable of rotating together with the operation shaft to output electrical signals. The operation shaft 12 has a small-diameter section 12a, which is formed at its rear end, and a large-diameter section 12b, which is positioned on the front side of the small-diameter section 12a and has a diameter larger than that of the section 12a. The rotating body 8 has a small-diameter hole 8f, which is formed on its rear end side, and a large-diameter hole 8e positioned on the front side of the hole 8f, in which the large-diameter hole 8e is communicated with the small-diameter hole 8f and has a diameter larger than that of the small-diameter hole 8f. The rotating body 8 is mounted on the operation shaft 12 by inserting the small-diameter section 12a into the small-diameter hole 8f through the large-diameter hole 8e, and by press-contacting the large-diameter section 12b with the large-diameter hole 8e.

Description

554361 A7 B7

[Detailed description of the invention] [Technical field to which the invention belongs] The present invention relates to rotary electrical parts, such as encoders and variable resistors, which are suitable for electronic equipment such as televisions and video recorders. [Conventional Technique] The following is a drawing for explaining a conventional rotary electrical component. FIG. 10 is a cross-sectional view of a main part of a conventional rotary electrical component. A conventional rotating electrical component will now be described with reference to Fig. 10, in which the insulating panel 51 is a circular thin plate-like shape. A resistor and a current collector (not shown) are formed on the front surface thereof. The fixing member 52 is made of a metal material and has the following parts: a circular thin plate-shaped upper wall portion 52a; a side wall portion 52b formed downward from a side edge of the upper wall portion 52a; and a center of the upper wall portion 52a A bearing portion 52d having a through hole 52c protruding from the front side and a protrusion 52e protruding from the upper wall portion 52a toward the rear side near the bearing portion 52d. The women's board 54 is mounted on the fixing part 52 through a claw part (not shown) and an upper wall part 52a through an overview 53 ′, so that an insulating substrate 51 is placed in front of the mounting board 54. On the status. The rotating body 55 includes a molded article made of synthetic resin, and includes: a substantially cylindrical base portion 55a; a substantially circular mounting hole 55b formed in the center of the base portion 55a; and a circular portion extending from the base portion 55a in the radial direction. 55c; and a plurality of concave-convex portions 5 5d formed on the circular portion 55c; and a sliding member 55e is embedded in the rear side surface of the circular portion 55c. The ratchet spring meal 56 is made of thin metal material. It is roughly ring-shaped and has a size ranging from -4-This paper applies the Chinese National Standard (CNS) A4 specification (210X297 mm)

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554361 A7 B7 V. Description of the invention (2) The protruding portion 5 6 a of the arm portion protruding rearward, the ratchet spring 56 is riveted to the protrusion 52 e of the fixing member 52, and the protruding portion 56 a is elastically connected to the rotating body. 55 on the uneven portion 55d. At the same time, due to the rotation of the rotating body 55, the convex portion 56a repeatedly engages with and disengages from the concave-convex portion 55d, thereby generating a click feeling. The operating shaft 57 is made of a metal material, and has a knob portion 57a, a flange portion 57b connected to the knob portion 57a and larger than the outer dimension of the knob portion 57a, and extending rearwardly from the flange portion 57b. The fitting portion 5 7 c, an elliptical worn-out portion 5 7 d provided on the front end of the fitting portion 5 7 c, and a thin-shaft guide portion 57 e formed at the front end of the worn-out portion 57 d. The operation shaft 57 is inserted into the through hole 52c of the bearing portion 5 2 d of the fixing member 52 from the front side, and is inserted until the flange portion 57b contacts the front end portion of the bearing portion 52d. Specifically, when the operation shaft 57 is inserted, the fitting portion 57c is pressed into the mounting hole 55b of the rotating body 55, and the fitting portion 57c and the mounting hole 5 5b are strongly engaged. At the same time, the guide portion 5 7 e is inserted into a guide hole 54 a formed in the center of the t-mount plate 54. In such a mounting operation of the operation shaft 57, the fitting portion 57 c and the mounting hole 55 b are configured in the same shape, and both of them are strongly fitted from the vicinity of the entrance of the mounting hole 5 5 b. Therefore, the fitting portion 57 c must be fitted. Press into the mounting hole 55b. Therefore, the operating shaft 57 must be mounted by press-fitting in a state where the mating portion 57c and the mounting hole 55b are held in a radial position by a monthly positioning fixture. The rotating electrical parts in the conventional technology have the above-mentioned structure. By rotating the operation shaft 5 7, the rotating body 5 5 and the operation shaft 5 7 rotate together, and the sliding member 55 e slides on the resistance, thereby changing the resistance value and outputting the voltage. Changed. ______ · 5-This paper size is suitable for towel @ g 家 standard (CNS) △ Grid (21Qχ Tearing Love) ------- Binding

554361

[Problems to be Solved by the Invention] The prior art rotating electrical parts have the above-mentioned structure and operate in the above manner. However, when the operation shaft 57 is mounted, it is necessary to position and hold the fitting portion 57c and the mounting hole in a radial direction using a clamp. 5 5b is pressed in the state, so there is a problem that the writing industry is complicated and the mass production performance is poor. The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a rotary-type electrical component capable of performing assembly operations with high accuracy and simplicity by improving the shape of an operating shaft and a rotating body without using a positioning fixture of a South precision. . [Means for Solving the Problem] As a first solution to the above-mentioned problem, the rotary electrical component of the present invention is provided with an operation shaft rotatably supported on a fixed member, and t is attached to the operation shaft to perform the operation. The shaft rotates a rotating body that outputs an electric signal together, wherein the operation shaft has a small diameter portion formed at a rear end and a large diameter portion located on a front side of the small diameter portion and having a larger diameter than the small diameter portion. A small diameter hole formed on the rear end side and a large diameter hole communicating with the small diameter hole and located on the front side and larger than the diameter of the small diameter hole; the small diameter portion is inserted into the small diameter via the large diameter hole; Further, the rotary body is mounted on the operation shaft by crimping the large-diameter portion into the large-diameter hole. In addition, as a second solution, a protruding portion is provided in the large-diameter hole of the rotating body of the rotating electrical component of the present invention, and the large-diameter portion of the operating shaft is in a state of crushing the protruding portion. Then, it is crimped into the large-diameter hole for installation.

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V. Explanation of the invention (4) The third solution of the external material, the rotating electrical parts of the present invention, the protrusion 邛 / σ is formed by extending the axial direction of the operation shaft, and is formed in a relative manner. ^ 外 '为The fourth solution is that the large-diameter hole of the rotating electrical part of the present invention is formed into an ellipse, and at the same time, the aforementioned protrusions are provided on the four corners of the large-diameter hole.: Two = Five solutions are provided in the present invention. Rotary electrical appliance =: The protruding portion in the large-diameter hole is set close to the small-diameter hole. Before the large-diameter portion invites the small-diameter portion to be broken, the small-diameter portion is inserted into the small-diameter portion. In the diameter hole. In addition, 1 is the sixth solution, and the small-diameter portion of the rotating electrical component of the present invention is in close contact with the small-diameter hole. In addition, as a seventh solution, the rotation of the present invention The stepped portion I between the large-diameter portion and the small-diameter portion of the operating shaft of the electric appliance is provided with a tapered portion, and the rotating body has a space between the small-diameter hole and the large-diameter hole and is positive to the drawing direction. Cross The stepped portion forms a space portion between the stepped portion of the tapered portion and the stepped portion in a state where the large-diameter portion is fixedly housed in the large-diameter hole. 〃 [Brief description of the figure] Fig. 1 is a rotary type of the present invention. A cross-sectional view of a main part of an electric appliance. Fig. 2 is a diagram of the rotation type electric appliance of the present invention as viewed from the front side. * Fig. 3 is a diagram of the rotation type electric appliance of the present invention as viewed from the rear side. At this time, the paper size is in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) 554361 A7 B7 V. Description of the invention (5 Fig. 4 is an enlarged view showing the protruding portion of the rotating body of the rotating electrical part of the present invention. Fig. 5 is a sectional view taken along the line 5-5 in Fig. 2. Fig. 6 is a perspective view of a ratchet spring of the rotary electric part of the present invention. Fig. 7 is a front view of an operating shaft of the rotary electric part of the present invention. The figure seen when the operating shaft of the rotating electrical component of the present invention is viewed from the rear side. Fig. 9 is an explanatory view showing the operating shaft of the rotating electrical component of the present invention during the insertion process. A cross-sectional view of the main parts of the rotating electrical parts of the technology. [Embodiments of the invention] The drawings of the rotating electrical parts of the present invention will be described below. FIG. 丨 is a sectional view of the main parts of the rotating electrical parts of the present invention, FIG. 2 FIG. 3 is a view when the rotating body of the rotating electrical component of the present invention is viewed from the front side, FIG. 3 is a view when the rotating body of the rotating electrical component of the present invention is viewed from the rear side, and FIG. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 2, and FIG. 6 is a perspective view of a ratchet spring of the rotary electric part of the present invention, and FIG. 7 is a perspective view of the ratchet spring of the rotary electric part of the present invention. Rotary electric parts are front views of the operating shaft of the part. FIG. 8 is a diagram when the operating shaft of the rotary electric part of the present invention is viewed from the rear side, and FIG. 9 shows the operation of the rotary electric part of the present invention. An illustration of a shaft in the middle of the insertion process. The rotating electrical parts of the present invention will now be described with reference to FIGS. 1 to 9, wherein:

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554361 V. Description of the invention U) The bottom wall portion 1 is formed of a molded product of synthetic resin and has a thin circular plate shape. A sliding member 2 and a terminal portion communicating with the sliding member 2 are embedded in the bottom wall portion 1. 3 sheet metal body. In addition, the sliding member 2 projects forward from the front side surface of the bottom wall portion 1, and the terminal portion projects from the side surface of the bottom wall portion i. The cylindrical portion 4 is formed of a synthetic resin molded product and has a cylindrical base portion 粍; a stepped portion 4b formed from a substantially intermediate portion of the base portion 4a toward the center and extending in the circumferential direction; the cylindrical portion 4 surrounds the bottom wall portion丨 configuration. The fixing member 5 is made of a metal material, and includes a circular thin plate-shaped upper wall portion 5a, and a bearing portion 5c having a through hole 5b formed to protrude forward from a central portion of the upper wall portion 5 & A claw support portion 5d of a concave portion on the front side surface of the upper wall portion 5a; and a protrusion 5e formed to protrude from a side surface of the rear portion of the upper wall portion 5a. The mounting plate 6 is made of a thin metal plate, and includes a support portion 6a having a substantially circular plate shape, four claw portions 6b extending forward from the support portion 6a, and mounting legs 6c extending rearward of the support portion 6a. The mounting plate 6 is in a state where the fixing member 5 and the bottom wall portion 1 and the cylindrical portion 4 are clamped by the engagement of the claw portion 6b extending forward and the claw supporting portion 5 (1 of the fixing member 5. Specifically, «儿The support portion 6 a is in contact with the rear side surface of the bottom wall portion 1 and is in contact with the rear side surface of the stepped portion 4 b of the cylindrical portion 4. In this way, the bottom wall portion i, the cylindrical portion 4 and the fixing member 5 form a cylindrical shape. The accommodating portion 7. The rotating body 8 is formed of a synthetic resin molded product and has: a circular portion 8a having a substantially circular plate shape; an elliptical mounting hole 8b formed in the center of the circular portion 8a; On the front side, it spans about 300 degrees around the mounting hole 8b. This paper is sized to fit the country @ 家 standard (CNS) M specifications (⑽χ⑽ 公 爱)

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554361 Description of the invention (A recessed portion 8c formed in the range of 7 $; and a plurality of concave-convex portions 8d formed in the radial direction near the outer periphery of the circular portion. The mounting hole 讣 has an enlarged large-diameter hole 8e located forward. An elliptical small-diameter hole 8f provided on the large-diameter hole 8e and smaller in diameter than the large-diameter hole 8e; a step formed in the radial direction between the large-diameter hole and the small-diameter hole 8f. In addition, such as As shown in FIGS. 4 and 5, in the present embodiment, near the small-diameter hole 8f, protrusions 讣 extending from the stepped portion 8g to the front side are formed, and the protrusions 讣 are formed on the four corners of the large-diameter hole 8e. The protruding portion 8h is formed in an elongated shape in this embodiment, but it is not limited to this, and may be merely a protrusion. In addition, a plurality of protrusions may be arranged in a row or arranged side by side. The insulating substrate 9 is composed of a thin circular plate, and has a recessed portion 9a formed in a recessed manner from the outer edge on the rear side and printed to form a plurality of patterns 10 as shown in Fig. 3. The insulating substrate 9, as shown in Fig. 3, In a state where the recessed portion is engaged with the claw portion 8k of the rotating body 8, It is integrally mounted on the rear side of the rotating body 8. The ratchet spring sauce 11 is made of a thin metal material, and, as shown in FIG. 6, has a flat base body 11a folded into a substantially <-shaped shape; from this base body 1U obliquely formed pair of 4 folds 1 1 b; a protruding portion 11c protruding from the front end of one bend 丨 丨 b to the rear side; a through hole formed in the center nd: formed in the through hole 1 1 d A rectangular hole 1 1 ^ between the protrusion 1 1 c. The rotating body 8 and the ratchet spring 丨 丨 which are integrated with the insulating substrate 9 are accommodated in the guana 7, and the base body of the ratchet spring 1 1 丨 a It is elastically connected to the upper wall portion 5a of the fixing member 5, and the bending piece 11b elastically presses the rotating body 8. The vicinity of the outer edge of the rear side of the rotating body 8 becomes a stepped portion pressed toward the cylindrical portion 4.

This paper size applies to China National Standard (CNS) A4 (210X -10-$ 7mm)

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Line 4 4554361 A7

On the front side while being held. In addition, the protrusion of the fixing member 5 passes through the rectangular hole 丨 丨 e of the ratchet spring 11 so that the ratchet spring 丨 丨 does not shift. In addition, the protrusion 5e is located in the recessed part 8 (: inside of the rotating body 8). When the rotating body 8 integrated with the insulating substrate 9 is held, the sliding member 2 is in contact with the insulating substrate 9. By the rotation of the rotating body 8, the pattern 10 repeatedly contacts the sliding member 2 without contact, and is output from the terminal portion 3. Pulse signal. In addition, when the rotating body 8 rotates, the protruding portion 11 (of the ratchet spring 丨 丨 repeatedly engages and disengages with the uneven portion 8d of the rotating body 8 to generate a click feeling. Operation shaft 1 2 is made of a metal rod-shaped body and has a small-diameter portion 1 2 a formed on the rear end side; a large-diameter portion 1 2 extending from the small-diameter portion 1 2 a to the front side and having a larger diameter than the small-diameter portion 1 2 a b; a rotating portion 1 2 c extending forward from the large diameter portion 1 2 b; a tapered portion 1 2 d is provided on a stepped portion between the small diameter portion 1 2 a and the large diameter portion 1 2 b, and From the small-diameter portion 丨 2 a to the worn-out portion I2e of the large-diameter portion 12 b, the small-diameter portion 12 a and the large-diameter portion 12 b The operation shaft 12 is inserted from the front side of the through hole 5 b of the fixing member 5. During the insertion, as shown in FIG. 9, the small diameter portion 1 2 a is guided by the small diameter hole 8 f. In the state where the center of the rotating body 8 and the operating shaft 12 is determined, the large-diameter portion 1 2 b has a worn-out portion 1 2 e — the surface is broken by four protruding portions 8 h, and one side is pressed into the large direct control hole 8. e. At this time, before the large-diameter portion 1 2 b crushes the protruding portion 8 h, the small-diameter portion 12 a is inserted into the small-diameter hole 8 f, and the small-diameter hole 8 f is blocked and enlarged before the protruding portion 8 h is crushed. The diameter hole 8e is plugged, so the gas generated when the protruding portion is crushed 8 h remains in the large diameter hole 8e. In addition, in this embodiment, the small diameter portion 12a and the small diameter Hole 8 f is tightly fitted ______- 11 &gt; This paper size applies Chinese National Standard (CNS) A4 (210X297 mm) 554361 A7 ___ B7 V. Description of the invention (9), so the large diameter hole 8 e is completely In the state of a cock, the gas can be reliably retained in the large-diameter hole 8 e. In addition, as shown in FIG. A space portion 13 is generated between the step portion 8 g of the body and the tapered portion 12 d of the operation portion 2, and the gas is retained in the space portion 13, so that the gas can stay more reliably in the large-diameter hole 8 e. This insertion The operation shaft 12 can be smoothly inserted into the operation shaft 12 in the state of determining the center. At the end of the insertion, the protruding portion 811 can be crushed and the large-diameter portion 1 2b can be pressed in. The high-precision positioning jig can be inserted easily without any center displacement. At the same time, the front end of the small-diameter portion 12a is riveted with a jig, and the operation shaft j2 and the rotating body 8 are reliably fixed. In addition, since the large-diameter hole 8 e and the small-diameter hole 8 f are both oval-shaped, the large-diameter portion 2 b and the small-diameter portion 2 a are shaped like sugar circles due to the abraded portion 1 2 e, so these become flowers. When the keys are combined, the rotating body 8 rotates together with the operation shaft 12. At the same time, when the rotating body 8 rotates, the protrusion 5 e of the fixing member 5 moves within the recessed portion 8 c. When rotated to a certain angle or more, the protrusion 5 e contacts the wall portion of the recessed portion 8 c and stops. Role of the device. Therefore, the rotating body 8 can be rotated within a predetermined range of the rotation angle. The rotating electrical component of the present invention has the above-mentioned structure, and its operation will be described next. When the operating shaft 12 rotates, the rotating body 8 rotates together with the operating shaft 12 and the insulating substrate 9 rotates, so that the sliding member 2 repeatedly and circularly丨 〇 By making contact or non-contact, a pulse signal can be output from the terminal portion 3. At this time, the protruding portion 11c of the ratchet spring 11 and the concave-convex portion 8 (1) of the rotating body 8 are repeatedly engaged and disengaged, and a knocking feeling is generated, giving the operator a sense of rhythm. The rotating electrical component of the present invention has the above-mentioned structure And with the square above

554361 A7 -------- B7 V. Description of the invention (10) Operation 'In this embodiment, the large-diameter hole 8 e is crimped to the large-diameter portion 1 2b by the protruding portion 8 h, but the convex portion The exit portion 8h is not necessary, and the diameter of the large straight follower hole 1 2 b may be made narrower toward the rear. In addition, although the encoder has been described as an example in the above embodiment, it is needless to say that it can be applied to rotating electrical parts such as a variable resistor. ADVANTAGE OF THE INVENTION The operating shaft of the rotating electrical component of this invention has a small-diameter part formed in the rear end, and a large-diameter part located in the front side of this small-diameter part and larger than a small-diameter part, and a rotating body has the rear-end side. The small-diameter hole and the large-diameter 4 'small diameter portion which is located on the front side and communicates with the small-diameter hole is larger than the small-diameter hole. With a large diameter hole, the rotating body is mounted on the operating shaft. With this structure, the operating shaft can be attached to the large diameter hole by crimping the large diameter portion to the large diameter hole in a state where the small diameter hole is centered. On the rotating body, it is possible to assemble the operating shaft with high accuracy and simplicity without the need for a 1¾ precision positioning jig. In addition, a protruding portion is provided in the large-diameter hole of the rotating body of the rotary electrical component of the present invention, and the large-diameter portion of the operating shaft is pressure-fixed and fixedly installed in the large-diameter hole in a state of breaking the protruding portion, so that The large-diameter portion can be reliably crimped and fixed into the large-diameter hole. In addition, since the protruding portion of the rotary electrical component of the present invention is formed to extend in the axial direction of the operation shaft and is formed relatively at the same time, the large-diameter portion can be crimped and fixed to the large-diameter hole more reliably. ~ In addition ‘because the large-diameter hole of the rotating electrical part of the present invention is oval

554361 A7 B7 V. Description of the invention (11) Shaped and the protrusions are set on the four corners of the large diameter hole. With this configuration, uniform pressure can be applied to the large diameter portion, and the operating shaft can be perfectly aligned with the axial direction. Since the crimping is performed in a parallel state, the large-diameter portion can be more reliably fixed in the large-diameter hole. In addition, the protruding portion provided in the large-diameter hole of the rotating electrical part of the present invention is provided near the small-diameter hole. Before the large-diameter portion breaks the protruding portion, the small-diameter portion is inserted into the small-diameter hole. Before the protruding part is crushed, the large-diameter hole is plugged by the small-diameter part, so the gas and the like stay in the large-diameter hole, so the gas and the like will not diffuse into the part, and can provide a highly reliable rotating electrical part. In addition, since the large-diameter portion only needs to be pressed into the large-diameter hole at the end of the insertion process, assembly work is simplified. In addition, since the small-diameter portion and the small-diameter hole of the rotating electrical part of the present invention are fitted in a close state, the inside of the large-diameter hole is surely plugged. Therefore, gas and the like remain in the large-diameter hole, so Gas and the like do not spread into the parts, but can provide highly reliable rotating electrical parts. In addition, a tapered portion is provided in a stepped portion between the large-diameter portion and the small-diameter portion of the operating shaft of the rotating electrical part of the present invention, and the rotating body has a direction orthogonal to the axis direction between the small-diameter hole and the large-diameter hole. The stepped portion is formed in a state where the large-diameter portion is crimped and fixed to the large-diameter hole, and a space portion is formed between the tapered portion and the stepped portion, so that gas generated when the protruding portion is crushed is retained. In this space portion, since the gas and the like reliably stay in the large-diameter hole, the gas and the like do not diffuse into the part, and a highly reliable rotating electrical component can be provided. ____-14-The paper size (CNS) A4 size (χ 297 public love)-Binding

554361 A7 B7 V. Description of the invention (12) [Element symbol description] 1 Bottom wall portion 2 Slide member 3 Terminal portion 4 Cylinder portion 4 a Base portion 4b Stepped portion 5 Fixing member 5a Upper wall portion 5b Through hole 5 c Bearing portion 5d Claw supporting portion 5e Protrusion 6 Mounting plate 6 a Supporting portion 6b Claw portion 6 c Mounting foot 7 Receiving portion 8 Rotating body 8a Round portion 8b Mounting hole 8c Concave strip portion 8d Concave and convex P 8e Large diameter hole binding

Line-15-This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) 554361 A7 B7 V. Description of the invention (l3) 8f Small diameter hole 8g Stepped portion 8h Protruded portion 8k Claw portion 9 Insulating substrate 9 a recessed part 10 pattern 10 11 ratchet spring 1 la base lib bent part 11c protruding P 1 Id through hole lie rectangular hole 12 operating shaft 12a small diameter part 12b large diameter part 12c rotating part 12d tapered part 12e wear-off part 13 Ministry of Space. -16-This paper size applies to China National Standard (CNS) A4 (210X297 mm)

Claims (1)

554361 A8 B8 C8 D8 6. Scope of patent application 1. A rotating electrical part, which is characterized by: an operation shaft rotatably supported on a fixed member, and an operation shaft mounted on the operation shaft and rotating together with the operation shaft. A rotating body that outputs an electric signal; the operating shaft has a small diameter portion formed on the rear end side, and a large diameter portion located on the front side of the small diameter portion and having a larger diameter than the small diameter portion; the rotating body has a rear end side A small diameter hole that communicates with the small diameter hole and is located on the front side and has a larger diameter than the small diameter hole; inserting the small diameter portion into the small diameter hole through the large diameter hole and inserting the large diameter The portion is crimped to the large-diameter hole to mount the rotating body to the operation shaft. 2 · According to the rotating electrical part of the scope of application for a patent, in which a protruding portion is provided in the large diameter hole of the rotating body, and the large diameter portion of the operation shaft is crimped in a state where the protruding portion is broken. It is fixedly installed in the aforementioned large diameter hole. 3. The rotating electrical part according to the second item of the application, wherein the above-mentioned four output portions are formed to extend along the axial direction of the operation shaft, and are formed to face each other. 4. For example, the rotating electrical component of item 2 or 3, wherein the large-diameter hole is #circular and the protrusions are provided on four corners of the large-hole. 5. For the rotating electrical parts with the scope of patent application No. 2 or 3, the protruding portion provided in the large-diameter hole is located near the small-diameter hole, and the protrusion is worn out in the large-diameter portion. Previously, the aforementioned small-diameter national materials (CNS) -17-554361 A8 B8 C8 D8 six patent application scopes were inserted into the aforementioned small-diameter holes. • Rotary electrical parts such as those in claim 2 or 3, in which the small-diameter portion and the small-diameter hole are fitted in a close state. • If the rotating electrical parts of the second or third item of the patent application, wherein a tapered portion is provided at the stepped portion between the large diameter portion and the small diameter portion of the aforesaid shaft, the rotating body is disposed between the small diameter hole and the small diameter hole. A step portion orthogonal to the axial direction is provided between the large-diameter holes, and a space portion is formed between the tapered portion and the step portion in a state where the large-diameter portion is press-fitted into the large-diameter hole. -18-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)