JPH04244634A - Flywheel - Google Patents

Abstract

PURPOSE:To disperse the eccentricity of each wheel plate to make the eccentric quantity of a flywheel less by providing plural doughnut-shaped wheel plates, and piling up the wheel plates with their rotation made one by one as much as a fixed angle to unite them for forming a wheel body. CONSTITUTION:A wheel plate 6 is formed of a doughnut-shaped metallic plate, and its central part is provided with a center hole 7, and moreover a pair of holes 9 are formed on the periphery of the plate 6. In addition to that, a pair of projections 10 are formed at a position where rotation has been made as much as a fixed angle, namely a piling up angle theta=90 deg., with a distance from the center P to a pair of the holes 9 adopted as a radius R. The wheel plate 6 is positioned by rotating the wheel plate 6 on the right side as much as theta=90 deg. to the wheel plate 6 on the left side to fit the projection 10 in the hole 9, and this action is repeated to pile up the plural wheel plates 6 for forming a wheel body 13, and the wheel body 13 is thread-fixed to a connecting plate for forming a flywheel.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel used as a rotating member in electrophotography and the like.

0002

[Prior Art] Conventionally, as a flywheel used as a rotating member in electrophotography, for example,
There is one disclosed in Japanese Patent No. 173765. In this case, in an electrophotographic photoreceptor in which a flange (hereinafter referred to as a flywheel) is attached to an opening at the end of a drum serving as a cylindrical base, a stepped portion is formed in the outer peripheral area of the flywheel, and the stepped portion is There is a device that prevents rotational vibration of the drum by attaching it to the end opening of the drum using an adhesive.

0003

[Problems to be Solved by the Invention] In the conventional flywheels mentioned above, the material is generally made of iron or the like, and those made by integrally molding a plurality of these flywheels are made of sheet metal. In comparison, the cost is high and the weight is heavy. Furthermore, in the case of overlapping sheet metals, since the plurality of sheet metals are fixed using a shaft, there is a problem in that the weight increases if the moments of inertia are the same when assembled. Further, when the same shaped sheet metal is made using the same mold, if the mold is eccentric, there is a problem in that the eccentric portions are piled up due to overlapping of the sheet metals.

FIGS. 4 to 6 show conventional examples as specific examples. First, as a first conventional example, as shown in Fig. 4, the flywheel 1 has a shape in which a region A located at the center of the rotating shaft 2 is punched out in order to have a light weight and a large moment of inertia. There is. However, when this shape is integrated and made using iron materials, etc., the cost is considerably higher than that of sheet metal due to the process. Further, as a second conventional example, as shown in FIGS. 5 and 6, there is one in which three sheets of metal 3 are stacked one on top of the other, thereby reducing costs. In this case, a hole 3a is formed in the center of each sheet metal 3, and a screw hole 3b is formed in the periphery of the hole 3a.
A plurality of flywheels 1 can be integrally fixed to the fixture 4 by inserting the protrusion 4a which becomes the rotation axis of the fixture 4 into the fixture 4 and fastening with the screw 5 through the screw hole 3b. However, in such a configuration, since the protrusion 4a serving as the rotation axis is used for positioning, the thick part near the rotation axis cannot be removed, and as a result, the weight is heavier than the first conventional example. There is a tendency to

[0005]

[Means for Solving the Problem] In the invention as set forth in claim 1, a plurality of donut-shaped wheel plates having a center hole serving as a rotation axis are provided in the center, and each of these wheel plates has a hole in the center. The wheel body is formed by rotating the wheels by a certain angle around the center and overlapping them and integrating them.
This wheel body was fixed to a connecting member.

[0006] In the invention according to claim 2, claim 1
In the described invention, the wheel plate has a pair of holes formed in the peripheral portion thereof located on a straight line passing through the center point of the center hole, and the pair of holes are formed at a certain angle around the center point of the center hole. A pair of protrusions that fit into the holes were formed at the rotated positions of the peripheral portion.

[0007] In the invention according to claim 3, claim 1
Or in the invention described in 2, the number M of wheel plates is m=360°, where the overlapping angle of the wheel plates is θ.
/θ was set to an integer multiple.

[0008]

[Operation] In the invention as claimed in claim 1, since the wheel plates are rotated by a certain angle and stacked one on top of the other, when the wheel plates are made using the same mold, the eccentricity of the wheel plate caused by the eccentricity of the mold is reduced. As a result, the amount of eccentricity of the flywheel as a whole of the wheel plate can be reduced.

In the invention as claimed in claim 2, since the holes and protrusions are formed in the peripheral area of each wheel plate, it is possible to reduce the wall thickness near the rotating shaft located at the center of the wheel plate. , This makes it possible to reduce the weight of the entire wheel plate.

In the third aspect of the invention, the eccentricity of the wheel plate due to the eccentricity of the mold is canceled out, so that the entire flywheel can have a well-balanced structure.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. The wheel plate 6 is made of a donut-shaped sheet metal, and is composed of a center part and a peripheral part formed around the center part. A center hole 7 is formed in its center. Further, a pair of holes 9 are formed in the peripheral portion on a straight line 8 passing through the center point P of the center hole 7, and a radius from the center point P to the pair of holes 9 is formed with the center point P as the center. R is a constant angle, that is, the overlapping angle θ = 90°
At the rotated position, a pair of protrusions 1 that fit into the holes 9 are provided.
0 is formed. Therefore, since the pair of protrusions 10 are also located on the same straight line 8 passing through the center point P, the holes 9 and protrusions 10 are formed alternately on the radius R at an angle of θ=90°. It turns out. Also, the angle between the hole 9 and the protrusion 10 is 1/2 of the 90° angle, that is, 45°.
A hole 11 for screw penetration is located on the radius r (r<R).
is formed. In this case, the holes 11 are provided facing each other on a straight line 12 passing through the center point P, and are arranged at a constant angle 9
Four pieces are formed with an interval of 0°.

[0012] When the wheel plates 6 constructed in this manner are stacked on top of each other, as shown in FIG.
By rotating the wheel plate 6 located on the right side by θ=90° with respect to the wheel plate 6 on the left side, the hole 9 and the protrusion 1 are formed.
0 can be fitted, thereby making it possible to perform positioning. By repeating such operations, a plurality of wheel plates 6 can be stacked on top of each other as shown in FIG. 2, thereby making it possible to create the wheel body 13. Finally, the wheel body 13
A flywheel centered around a rotating shaft 16 as shown in FIG. 3 is created by passing screws (not shown) into the holes 11 of each wheel plate 6 and fixing them in the screw holes 15 formed in the connecting plate 14 as a connecting member. can do.

Further, in this embodiment, the number M of the wheel plates 6 is m, where the overlapping angle of the wheel plates 6 is θ.
= 360°/θ is set to an integral multiple. That is,
Here, since θ=90°, m=4, so that the number M is an integral multiple of 4, that is, 8 wheel plates 6 are superimposed. Generally, when making sheet metals of the same shape using the same mold, the sheet metals will also be eccentric due to the eccentricity of the mold. However, as in this embodiment, the wheel plate 6 is rotated at 90°.
By rotating and fixing each piece and stacking 4 pieces,
It becomes possible to offset the eccentricity of the wheel plate 6 due to the eccentricity of the mold, thereby achieving a well-balanced configuration. Note that the pair of holes 9 and protrusions 10 that fit into each other are shaped differently, so when they are rotated and fixed, they can only be fixed in one direction, which makes assembly easier and more accurate. can.

Furthermore, as mentioned above, the hole 9 and the protrusion 10 are provided on the wheel plate 6 and the wheel plate 6 is fixed by these, so that the thickness of the central part near the rotation axis can be removed, which makes it possible to It is also possible to further reduce the weight. Further, since the weight can be reduced in this way, a number of wheel plates can be stacked and mounted, and the number of the plates can be changed as necessary. Therefore, this means that a large number of sheets can be used for models that require a large moment of inertia value, and a small number of sheets can be used for models that require a small moment of inertia value.
Functions can be changed with the same parts, further expanding the range of applications.

[0015]

[Effects of the Invention] The invention according to claim 1 provides a plurality of donut-shaped wheel plates each having a center hole in the center that serves as a rotation axis, and each of these wheel plates is rotated at a certain angle with respect to the center hole. The wheel body is formed by rotating and overlapping and integrating, and this wheel body is fixed to the joining member, so when wheel plates are made from the same mold, the eccentricity of the wheel plate caused by the eccentricity of that mold is dispersed. Therefore, the amount of eccentricity of the flywheel as a whole of the wheel plate can be reduced.

According to a second aspect of the invention, the wheel plate has a pair of holes formed in a peripheral portion located on a straight line passing through the center point of the center hole, and the pair of holes are located at the center point of the center hole. Since a pair of protrusions that fit into the holes are formed at the peripheral portion rotated by a certain angle around the wheel plate, it is possible to reduce the wall thickness near the rotation axis located at the center of the wheel plate. This makes it possible to further reduce the weight of the entire wheel plate.

In the third aspect of the invention, the number M of the wheel plates is m=
Since it is set to an integral multiple of 360°/θ, the eccentricity of the wheel plate due to the eccentricity of the mold is canceled out, and the flywheel as a whole can have a well-balanced configuration.

[Brief explanation of the drawing]

FIG. 1 is a front view of wheel plates stacked on top of each other, showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing how a plurality of wheel plates are stacked one on top of the other.

FIG. 3 is a side view of the flywheel.

FIG. 4 shows a first conventional example, in which (a) is a front view of the flywheel, and (b) is a side view thereof.

FIG. 5 shows a second conventional example, in which (a) is a front view of the flywheel, and (b) is a side view.

FIG. 6 is an exploded perspective view showing a second conventional example.

[Explanation of symbols]

6 Wheel plate 7 Center hole 8 Straight line 9 holes １０　　Protrusion 13 Wheel plate 14 Connecting member P Center point

Claims (3)

[Claims] [Claim 1] A plurality of donut-shaped wheel plates each having a center hole serving as a rotation axis are provided in the center, and these wheel plates are rotated one by one by a certain angle around the center hole to be stacked and integrated. A flywheel characterized in that a wheel body is formed by this, and the wheel body is fixed to a coupling member. 2. The wheel plate has a pair of holes formed in a peripheral portion thereof located on a straight line passing through the center point of the center hole,
The flywheel according to claim 1, characterized in that a pair of protrusions that fit into the holes are formed at positions in the peripheral portion of the pair of holes rotated by a certain angle about the center point of the center hole. . 3. The flywheel according to claim 1, wherein the number M of the wheel plates is set to an integral multiple of m=360°/θ, where θ is an overlapping angle of the wheel plates. .