JPS5852097B2 - Vibration isolation device for rotating electrical machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolating device for a rotating electrical machine such as a rotating electrical machine with a clutch used as a drive source for an industrial sewing machine, for example.
In particular, it relates to an elastic body used in the vibration isolator.

FIG. 1 is a front view showing a main part of a rotating electric machine with a clutch used in an industrial sewing machine in cross section.

In the figure, 1 is a rotor, 2 is a flywheel, 3 is a clutch disc, 4 is an end bracket, 5 is a clutch coil, 6 is a clutch yoke, 7 is a brake coil, 8
1 is a brake yoke, 9 is a brake disc, 10 is a spline cap, 11 is a sliding shaft, 12 is an output shaft, 13 is a clutch lining, 14 is a clutch ring, 15 is a brake lining, and 16 is a brake ring.

The rotor 1 is constantly rotating, and as the rotor 1
The flywheel 2 and clutch disc 3, which are fixed to the end of the shaft, also rotate together.

When it is desired to extract rotational driving force from the output shaft 12, the clutch coil 5 is energized.

Then, a field magnetic flux is generated from the clutch yoke 6 to the clutch disk 3, and the magnetic attraction force induced by this field magnetic flux causes the clutch ring 14 to move toward the sliding shaft 1.
1 toward the clutch disc 3 side, and the clutch lining 13 engages with the clutch disc 3.

Therefore, the rotational force of the flywheel 2 is taken out from the output shaft 12 via the clutch ring 14 and the sliding shaft 11.

When it is desired to stop the rotation of the output shaft 12, the clutch coil 5 is de-energized and the brake coil 7 is energized.

Then, a field magnetic flux is generated from the brake yoke 8 to the rear wall of the clutch yoke 6, the brake ring 16, and the brake disc 9, and the magnetic attraction force induced by this field magnetic flux causes the brake ring 16 to move onto the sliding shaft 11. is moved toward the brake disc 9 side, and the brake lining 15 engages with the brake disc 9, so the output shaft 1
2 stops rotating.

When it is desired to obtain a desired rotational speed, the desired rotational speed can be obtained from the output shaft 12 by intermittently energizing the clutch coil 5 and the brake coil 7.

A mounting leg 17 is provided at a predetermined position of the rotating electrical machine, and the rotating electrical machine is fixed to a mounting base 18 such as a sewing machine table via the mounting leg 17.

A vibration isolator is provided at the mounting location of the rotating electric machine.

2 to 4 show a conventional vibration isolator, FIG. 5 shows a mounting leg of a rotating electric machine, and FIGS. 6 to 8 show a vibration isolator used in the vibration isolator.

End 19 of mounting foot 17 as shown in FIGS. 3 and 5.
has a substantially U-shaped planar shape, and an outer fitting groove 20 penetrating from the upper surface to the lower surface is formed in the center of the end portion 19.

The end portion 19 of the mounting foot 17 is fitted onto the vibration isolating member 21 shown in FIGS.
Tighten and secure.

The vibration isolating member 21 includes an elastic body 23 made of bottom rubber or the like;
It is composed of an upper pressing plate 24 and a lower pressing plate 25 made of a metal plate or the like, and these three are combined together in advance.

The elastic body 23 has a bolt insertion groove 26 in its center that penetrates from the upper surface to the lower surface, and has a substantially U-shape.Furthermore, at approximately the vertical center of the outer periphery of the elastic body 23, there is a thin wall portion on the inside. Almost U-shaped fitting groove 2, leaving 27
B is formed.

As shown in FIG. 7, the groove width W1 of the bolt insertion groove 26 is
is designed to have approximately the same size as the outer diameter d of the tightening bolt 22, and is one thin wall portion 2 of the thin wall portions 27 provided so as to face each other.
External dimension W from the outer circumferential surface of No. 7 to the outer circumferential surface of the other thin wall portion 27
2 is designed to have approximately the same size as the groove width W3 in the outer fitting groove 20 of the mounting foot 17 shown in FIG.

Furthermore, the outer dimension W4 from one outer circumferential surface to the other outer circumferential surface in the mutually opposing portions of the elastic body 23 is designed to be approximately the same as the outer dimension W at the end 19 of the mounting foot 17 shown in FIG. has been done.

The planar shapes of the upper pressing plate 24 that abuts the upper surface of the elastic body 23 and the lower pressing plate 25 that abuts the lower surface of the elastic body 23 are substantially U-shaped like the elastic body 23 .

As shown in FIGS. 2 to 4, the end 19 of the mounting leg 17 of the rotating electric machine is fitted into the fitting groove 28 of the elastic body 23, and this is brought into contact with the mounting base 18 of a sewing machine table or the like.

Then, the tightening bolt 22 is inserted into the bolt hole 29 drilled in the mounting base 18, passes through the bolt insertion groove 26 provided in the elastic body 23, and the washer 30 and spring washer are attached to the tip of the tightening bolt 22. Loosely fit 31 into nut 3
Tighten with 2.

By doing so, the rotating electrical machine is tightened and fixed to the mounting base 18 via the vibration isolating member 21.

However, in this vibration isolator, as described above, the groove width W1 of the bolt insertion groove 26 of the elastic body 23 is approximately the same as the outer diameter d of the tightening bolt 22, and the groove width W1 of the bolt insertion groove 26 of the elastic body 23 is approximately the same as the outer diameter d of the tightening bolt 22, and The outer dimension W2 of the thin wall portion 27 to the outer circumferential surface of the mounting foot 17 is
The groove width W3 of the outer fitting groove 20 is designed to be approximately the same size as the width W3 of the outer fitting groove 20.

Therefore, when the vibration isolating member 21 is attached to the mounting foot 17, a portion of the inner peripheral surface of the thin portion 27 is already in contact with the tightening bolt 22, and a portion of the outer peripheral surface is already in contact with the mounting foot 17, respectively.

Therefore, when the tightening bolt 22 is tightened, there is no escape space due to compressive deformation of the thin wall portion 27 between the mounting foot 17 and the tightening bolt 22, and the thin wall portion 27 becomes locally hard, allowing the elastic body 23 to function as a vibration absorber. The vibration of the rotating electrical machine is reduced, and the tightening bolt 2 is transmitted through the hardened thin wall portion 27.
2 to the sewing machine table, which is the mounting base 18.

In order to improve this problem, vibration isolating members as shown in FIGS. 9 to 11 have been proposed.

In this vibration isolating member 21, the groove width W1 of the bolt insertion groove 26 is designed to be approximately the same size as the outer diameter d of the tightening bolt 22, as in the conventional case.

One thin wall portion 2 of the thin wall portions 27 provided to face each other
External dimension W from the extrinsic surface of No. 7 to the outer peripheral surface of the other thin wall portion 27
2 is designed to be slightly shorter than the groove width W3 in the outer fitting groove 20 of the mounting leg 17.

Further, a relatively thin connecting portion 33 connecting the upper end edge to the lower end edge of the fitting groove 28 is installed on the outer circumferential portion of both ends of the fitting groove 28 formed in the elastic body 23. A jetty 34 for positioning is formed.

The jetties 34 on both sides face each other, and the interval W between them is
6 is slightly shorter than the outer dimension W of the mounting foot 17 shown in FIG.

By designing W2 to be shorter than W3 as mentioned above,
An escape area is created due to compressive deformation of the thin wall portion 27, and the problem of the thin wall portion 27 becoming locally hard as in the prior art is eliminated.

Also, if W2 is simply made shorter than W3, mounting foot 1
When installing the vibration isolating member 21 on the T, the vibration isolating member 21 shakes and cannot be positioned, but as mentioned above, the opposite jetty 3
4.34, and the interval W6 is the outer dimension W5 of the mounting foot 17.
If it is made shorter, the vibration isolating member 21 can be positioned by the jetty 34.

However, this vibration isolator is not without drawbacks.

That is, when the vibration isolating member 21 is attached to the mounting foot 17, the fitting state of the mounting foot 17 and the vibration isolating member 21 cannot be accurately visually observed from the outside due to the communication portion 33 formed on the outer periphery of the fitting groove 28. .

Therefore, if the vibration isolating member 21 is mounted diagonally with respect to the mounting foot 17, even if W2 is made shorter than W3 and a gap is provided between the mounting foot 17 and the thin part 27, the mounting foot 17 will partially and the thin wall portion 27 come into contact with each other, and the thin wall portion 27 becomes locally hard during tightening, reducing the vibration damping effect.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration isolating device for a rotating electrical machine that eliminates the drawbacks of the prior art and can reliably exhibit a vibration damping effect.

In order to achieve this objective, the present invention is characterized in that a positioning protrusion is formed on the bottom surface of the insertion groove formed on the outer periphery of the elastic body.

Next, a vibration isolating member according to an embodiment of the present invention will be explained with reference to FIGS. 12 to 14.

The vibration isolating member 21 includes an elastic body 23, an upper pressing plate 24 disposed on the upper surface thereof, and a lower suppressing plate 2 disposed on the lower surface thereof.
It consists of 5.

The elastic body 23 is made of synthetic rubber or the like, and has a substantially U-shape in which a bolt insertion groove 26 is provided in the center thereof and extends from the upper surface to the lower surface.

Further, a substantially U-shaped fitting groove 2 is provided at a substantially central portion of the outer periphery of the elastic body 23 in the vertical direction, leaving a thin wall portion 27 on the inside.
8 is formed.

Furthermore, a protrusion 35 is provided on the bottom surface of the fitting groove 28 and is continuous over almost the entire length of the fitting groove 28 except for the folded portion.

By providing the protrusion 35 over almost the entire length of the fitting groove 28 in this manner, fitting into the mounting foot 17 becomes smooth.

As shown in FIG. 13, the groove width W of the bolt insertion groove 26 is
1 is designed to have approximately the same size as the outer diameter d of the tightening bolt 22, and is provided so as to be opposite to each other. (
The outer dimension up to the bottom surface is designed to be slightly shorter than the groove width W3 in the outer fitting groove 20 of the mounting foot 17.

Furthermore, the outer dimension W7 from the outer circumferential surface of one protrusion 35 to the outer circumferential surface of the other protrusion 35 is designed to be approximately the same size or slightly longer than the groove width W3 in the external fitting groove 20 of the mounting foot 17. ing.

Therefore, when the vibration isolating member 21 is attached to the mounting foot 17, the vibration isolating member 21 is positioned by the protrusion 35, and can be visually observed from the outside so that the vibration isolating member 21 can be installed in a normal state.

In addition, a space is formed between the part of the thin part 27 where the protrusion 35 is not provided and the mounting foot 17, and when the thin part 27 is compressed and deformed by the tightening force of the tightening bolt 22, the protrusion 35 and its Since the thin portion 27 in the vicinity can escape toward the space, the thin portion 27 does not become locally hard, and a sufficient vibration-proofing effect can be obtained.

In FIG. 12, it is convenient to fix the portion of the elastic body 23 in contact with the vertical wall 36 of the lower pressing plate 25 integrally to the vertical wall 36 by baking or gluing.

At this time, rather than fixing the elastic body 23 portion to the entire surface of the standing wall 36, for example, only the lower half of the standing wall 36 is fixed, and the elastic body 23 portion can slide against the standing wall 36 on the upper half. By doing so, even better vibration damping effects can be obtained.

That is, when the elastic body 23 is compressed in the vertical direction by the tightening force of the tightening bolt 22 via the upper pressing plate 24 and the lower pressing plate 25, the elastic body 23 portion is fixed to the entire surface of the vertical wall 36. If so, the compressive deformation of the elastic body 23 will not be performed smoothly and the surface hardness will increase.

On the other hand, as mentioned above, a part of the elastic body 23 is
If the elastic body 23 is firmly fixed, the compressive deformation of the elastic body 23 will be smooth and no increase in hardness will occur.

FIG. 15 is a diagram showing the vibration isolation characteristics of each vibration isolation device.

The curved line in the figure uses the vibration isolation members shown in Figures 6 to 8.
Curve B is a characteristic curve of a vibration isolator using the vibration isolator shown in Figures 9 to 11, and curve C is a characteristic curve of a vibration isolator using the vibration isolator shown in Figures 12 to 14, respectively. It was measured.

As is clear from this figure, in the case where the vibration isolating members shown in Figures 6 to 8 are used, the entire elastic body between the tightening bolt and the mounting foot becomes hard and the vibration isolating function is lost. Since the amplitude decreases extremely, the amplitude due to vibration is small as shown by curve A.

By using the vibration isolating members shown in Figures 9 to 11, the transmission of vibration can be significantly prevented, but the vibration isolating members are often tightened and fixed at an angle. , the anti-vibration properties are not satisfactory.

Compared to these, in the present invention, the vibration isolating member can always be installed normally, so the effect of providing an escape place for the elastic body can be reliably exhibited, and as shown in curve C, the vibration to the mounting base is reduced. transmission can be suppressed as much as possible.

The present invention has the above-mentioned configuration, and the mounting state of the vibration isolating member can be visually confirmed, and an excellent vibration isolating effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view with the main parts of the rotating electrical machine in cross section, Figs. 2 and 3 are cutaway front views and bottom views of a conventional vibration isolator, and Fig. 4 is a view taken from above the line I-I in Fig. 3. 5 is a plan view of the mounting foot of a rotating electrical machine, FIGS. 6 and 7 are cutaway front and bottom views of a vibration isolating member used in a conventional vibration isolator, and FIG. Side view seen from above the II-It line, No. 9
10 and 10 are a cutaway front view and a bottom view of the conventionally proposed vibration isolating member, FIG. 11 is a side view seen from above the line ■-■ in FIG. 10, and FIGS. 12 and 13 are the vibration isolation member of the present invention A cut front view and a bottom view of a vibration isolating member used in a vibration device, FIG. 14 is a side view seen from above line IV-11+' in FIG. 13, and FIG.
The figure shows the vibration isolation characteristics of each vibration isolation device. 17...Mounting foot, 18...Mounting base,
21... Vibration isolation member, 22... Tightening bolt, 23... Elastic body, 26... Bolt insertion groove, 27... Thin wall portion, 28...Inset groove, 35...Protrusion.

Claims (1)

[Scope of Claims] 1. An elastic body having a substantially U-shaped planar shape in which a bolt insertion groove is provided that penetrates from the upper surface to the lower surface of the central portion, and the insertion groove is formed by leaving a thin wall portion on the outer periphery; A rotating electrical machine having a substantially U-shaped mounting foot that fits into a fitting groove, a mounting base for mounting this rotating electrical machine, and a bolt insertion groove of the elastic body that is inserted into the bolt insertion groove and the rotating electrical machine is inserted through the elastic body. A vibration isolator for a rotating electric machine, comprising a tightening bolt for tightening and fixing the mounting foot to the mounting base, the vibration isolating device for a rotating electric machine, characterized in that a protrusion is provided on the bottom surface of the insertion groove of the elastic body. 2. The vibration isolator for a rotating electric machine according to claim 1, wherein the protrusion of the elastic body is continuously provided over substantially the entire length of the insertion groove.