JPS6120731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to high-speed rotating bodies such as flyholes and motor rotors.

An example of a conventional high-speed rotating body of this type is shown in FIGS. 1 to 3.

In the figure, 1 is a disk, 2 is a shaft, and 3 is an intermediate ring. These disk 1, shaft 2, and intermediate ring 3 are bonded to each other with an adhesive. The disk 1 is made of fiber-reinforced plastic (so-called ERP resin) such as glass fiber composite material or carbon fiber composite material, the shaft 2 is made of a steel material such as carbon steel or alloy steel, and the intermediate ring 3 is made of a soft elastic material such as rubber.

In the high-speed rotating body configured as above,
FIG. 2 shows the state of deformation of each member when the disk member formed by fixing the disk 1 and the intermediate ring 3 and the shaft 2 are individually rotated about the axis 10 at an angular velocity W. In FIG. 2, dotted lines indicate the state before rotation. As shown in the figure, the amounts of radial deformation of the disc members 1 and 3 and the shaft 2 are different at the fitting portion of the two members, and the amount of deformation of the disc members 1 and 3 is much larger than that of the shaft 2. Therefore, a gap of δ is created between the two. The gap δ increases as the ratio of specific gravity/Young's modulus between the disk members 1 and 3 and the shaft 2 increases.

However, in an actual rotating body, as shown in Fig. 1, the fitting parts of the two are adhered with adhesive, and therefore, as shown in Fig. 3, σ _R is applied to the adhesive part during rotation. A tensile stress in the radial direction acts.

The conventional system shown in Figure 1 has the problem that the tensile stress σ _R causes the adhesive to peel off, creating an imbalance in the rotating body, inducing vibration, and making high-speed operation impossible. Ta.

As a means to prevent the adhesive from peeling off as described above, a protrusion extending in the axial direction is provided on the inner circumference of the disk 1, and the protrusion is pressed from the outer circumference of the disk 1 to prevent the shaft 2 from peeling off.
A method has been proposed for coupling the disk 1 with the disk 1, but in the case of such a method, high stress is generated locally in the protrusion, making high-speed operation impossible.
However, in reality, this method is rarely used.

The present invention has been made in view of the above, and an object of the present invention is to provide a rotating body that prevents the generation of vibrations and is capable of high-speed operation by preventing the occurrence of separation between the disk and the shaft during operation.

1 of the present invention with reference to FIGS. 4 and 5 below.
To explain the embodiment, 1 is a disk made of fiber-reinforced plastic (so-called FRP resin) such as glass fiber composite material or carbon fiber composite material, 2 is a shaft made of steel material such as carbon steel or alloy steel, and 4 and 5 are carbon fibers. Holding plate made of steel plate, alloy steel plate, etc., 6, 7
are bolts for fixing the holding plates 4 and 5 to the shaft 2. The disk 1 has a θ angle with respect to the axis 10.
₁ , inclined conical part 1a, θ ₂ with respect to axis 10
An inclined conical portion 1b, an inner hole 1c for fitting with the shaft 2, and a stepped portion 1d for positioning the disk 1 on the shaft 2 are formed. A stepped portion 2a is formed on the shaft 2 to be in contact with the stepped portion 1d of the disk 1.

Conical portions 4a, 5a and mounting portions 4b, 5b to the shaft 2 are formed on the presser plates 4, 5, and the mounting portions 4b, 5b are connected to the mounting surface 2 of the shaft 2 with bolts 6, 7.
b, 2c, the conical part 4
a, 5a are brought into pressure contact with the conical portions 1a, 1b of the disk 1. The above inclination angles θ ₁ and θ ₂ are
Select as appropriate between 20° and 50°.

To assemble the above rotating body, disk 1 is attached to shaft 2.
is inserted from above, and the stepped portions 1d and 2a of both are brought into contact.

Next, the conical part 4a of the holding plate 4 is pressed against the conical part 1a of the disk 1 from above, and the bolt 6 is tightened to fix the holding plate 4 to the shaft 2. Further, the conical portion 5a of the holding plate 5 is pressed against the conical portion 1b of the disk 1 from below and the bolt 7 is tightened to fix the holding plate 5 to the shaft 2. The presser plates 4 and 5 are mounted so that a slight gap exists between their inner peripheries and the outer periphery of the shaft 2 facing them.

Next, the operation of the present invention will be explained with reference to FIG.

First, as shown in FIG. 5a, the conical part 5 of the presser plate 5 is
When a is pressed against the conical portion 1b of the disk 1 from below (no pressing force is applied),
There is an initial gap of Δ1 between the mounting portion 5b of the holding plate 5 and the mounting surface 2c of the shaft 2, and an initial gap of _δO between the inner hole 1c of the disk 1 and the outer peripheral surface 2d of the shaft 2. Each exists.

Next, as shown in FIGS. 5b and b1, when the bolt 7 is tightened to secure the presser plate 5 to the shaft 2, the
1 disappears, but the presser plate 5 is bent to create a gap between the edge of the conical portion 5a and the mounting surface 2c of the shaft 2 that is approximately equal to the above △1, that is, the amount of deflection during installation △
11 is generated, and a certain surface pressure is generated between the conical portion 5a of the presser plate 5 and the conical portion 1b of the disk 1 due to the elastic deformation of the presser plate 5. In this case as well, the above-mentioned initial gap δ _O is maintained as it is.

FIG. 5c shows the state in which the rotating body is rotating around its axis 10 at a rotational angular velocity ω. In this case, when the disk 1 and shaft 2 are rotated independently at an angular velocity ω, the relative displacement in the radial direction is δ, and the axial displacement corresponding to this δ is Δ2 (Fig. 5 b1
), during the above rotation, there is a gap of △3 = △11 - △2 between the edge of the conical portion 5a of the holding plate 5 and the mounting surface 2c of the shaft 2, and the remaining holding plate 5
maintains an elastically deformed state, and a required surface pressure is maintained between its conical portion 5a and the conical portion 1b of the disk 1.

That is, the thickness of the holding plate 5 and the inclination angle θ2 are determined so that the gap Δ3 is always maintained when the rotating body is operated at a required angle ω.

As mentioned above, the difference in radial displacement that occurs at the joint between the conical portion 1b of the disk 1 and the conical portion 5a of the holding plate 5 during rotation of the rotating body is defined as the amount of deflection △11 when the holding plate 5 is attached. By absorbing the movement in the axial direction due to the elasticity of the holding plate 5, the required contact pressure is always maintained on the joint surface during the rotation of the rotating body.

The above operation is exactly the same for the upper presser plate 4.

Note that supporting the weight of the disk 1 and positioning the disk 1 and the shaft 2 in the axial direction are performed by the stepped portions 1d and 1d.
It will be held at 2a.

6 and 7 show other embodiments of the invention.

In the one shown in Fig. 6, two relatively lightweight disks 1A and 1B are attached to one shaft 2 via presser plates 4 and 5, and 2a1 is connected to disk 1 provided on shaft 2. This is a stepped part for positioning.

The one in Figure 7 has the presser plate 4 only on one side,
Fixing the holding plate 4 using locktets 8 instead of the bolts 6 and 7 in FIGS. 4 and 6,
On the opposite side, there is a stepped part 2a for positioning having an inclined surface.
2.

The functions and effects of both the above-mentioned FIGS. 6 and 7 are the same as those of FIG. 4.

FIG. 8 shows an example in which the present invention is applied to a horizontally rotating body, and in this case, the stepped portion for supporting the weight of the disk 1 unlike the ones in FIGS. 4 to 7 is unnecessary.

In each of the above embodiments, a cylindrical disk is exemplified, but the disk is not limited to a cylindrical shape, and may have a cylindrical shape, a disk with chamfered corners on the outer periphery, or a disk with a cross section so that the internal stress is approximately equal. It may be formed such that the wall thickness becomes gradually thinner toward the outer periphery.

Regarding the shape of the thin-walled presser plate, in the above embodiment, only a disc-shaped part for attaching to the shaft was exemplified, but the shape for attaching to the shaft was a conical shape (with a larger cone angle than the conical part). A shallow dish shape) or a curved conical surface may be used.

The present invention is constructed as described above, and according to the present invention, during the rotation of the rotary shaft body, the disk and the shaft are always fixed with the required surface pressure through the presser plate due to the elasticity of the presser plate. Therefore, there is no possibility of separation of the joint surface between the disk and the shaft as in the conventional case, and the rotating body can be operated safely without vibrations. Therefore, it is also possible to increase the speed of the rotating body.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a conventional rotating body, and Figure 1 is a cross-sectional view along the axis, and Figures 2 and 3 are
The figure is a diagram for explaining the action. 4 and 5 show one embodiment of the present invention,
FIG. 4 is a diagram corresponding to FIG. 1, and FIG. 5 is a diagram for explaining the operation. 6 to 8 are views corresponding to FIG. 1 showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Disc, 1a, 1b... Cone part of disk, 2... Shaft, 4, 5... Presser plate, 4a, 5a... Cone part of presser plate.

Claims (1)

[Claims] 1. In a rotating body formed by fitting a disk around the outer periphery of a rotating shaft, a conical contact surface is formed on the inner periphery of the disk, and one end of a presser plate fixed to the rotating shaft in a cantilevered manner is connected to the disk. A high-speed rotating body that is brought into pressure contact with the contact surface of.