JPH0232909Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a viscous damper, particularly a viscous damper in which a viscous fluid is sealed inside.

[Prior art]

Figures 1a and 1b are explanatory diagrams of a conventional viscous damper, in which 1 is a rotating machine, and 2 is a rotating shaft 1 of this rotating machine 1.
-1 is a viscous damper fixed to the viscous damper; 3 and 4 are a case and a cover forming the outer cover; 7 is a bearing fixed to the viscous damper 2; and 8 is a bearing 7 rotatably supported within the outer cover. A flywheel, 9, a viscous liquid such as oil injected into the gap between the flywheel 8, the inner surface of the case 3, and the cover 4, 4-1
indicates a window provided in the cover 4 for injecting the liquid 9, and 11 indicates a plug for closing the window 4-1.

Since conventional viscous dampers use liquid as the element that provides the damping function, the materials of the case 3 and cover 4 and the joint 5-
1, 5-2, the joint 5-3 between the window 4-1 of the cover 4 and the plug 11, the fitting dimensions and fixing means of the window 4-1 and the plug 11 are variously devised, but the sealing performance is maintained. It was difficult to do so.

In other words, it is difficult to prevent the sealed liquid 9 from leaking to the outside, and the reasons for this are as follows.
The rotary machine 1 is connected to the shaft 1-1 on which the damper 2 is mounted.
The self-generated heat is transferred to the inside of the damper 2 via the case 3 and the bearing 7, and the liquid 9 inside the damper 2 is
However, since the remaining air expands and the internal pressure increases, the sealing structure of the three joints 5-1, 5-2, and 5-3 may be slightly damaged.

There is also a structure in which a plug 11 for sealing the window 4-1 is applied with adhesive and press-fitted into the window 4-1, which is the injection hole for the liquid 9 to be sealed. There are also many cases where the leakage prevention function is not sufficient.

As described above, in conventional viscous dampers, it is difficult to prevent the liquid sealed inside to provide a damping function from leaking to the outside, and its effectiveness has been poor.

In order to eliminate this drawback, as shown in FIG. 2, the window 4-1 serving as a liquid inlet is sealed with a thin film seal 6 made of a soft material that is easily deformable and does not allow the liquid 9 sealed inside to pass through. There are things,
In this way, the thin film seal 6 can absorb the increase in internal pressure caused by the expansion of the liquid 9 and residual air sealed in the damper 2 due to the increase in internal temperature, which is a problem in the prior art.

That is, assuming that the left side of the thin film seal 6 in FIGS. 3a and 3b is inside the damper, when pressure is applied to the thin film seal 6 as shown by the arrow due to an increase in internal pressure, it protrudes outward as shown in FIG. 3c. Transform it so that

The above phenomenon occurs because the increase in internal volume due to the deformation of the thin film seal 6 is accompanied by an increase in internal pressure.
This absorbs changes in internal pressure and prevents them from affecting the joint.

However, such a thin film seal 6 is not suitable for the window 4-1.
It was extremely difficult to mount it in a liquid-tight manner.

[Purpose of invention]

An object of the present invention is to obtain a viscous damper in which a thin film seal that is easily deformable and does not allow liquid to pass through can be very easily and liquid-tightly attached to a window provided in the viscous damper that has a liquid sealed therein.

[Summary of the idea]

The viscous damper of the present invention has a flywheel rotatably disposed inside a sealed jacket, a viscous liquid is sealed in the gap between the flywheel and the inner surface of the jacket, and a part of the jacket is filled with a viscous liquid. In a viscous damper in which a window is bored and the window is sealed with a thin film seal that is easily deformable and impermeable to liquid, the thin film seal is fixed to the window by bushing, and the thin film seal has a large diameter flange in contact with the outer surface of the jacket. and a bottomed cylindrical part that fits into the window, the window has a step on its inner peripheral surface with a small diameter part near the outside and a large diameter part near the inside, and the bushing has a step having a small diameter part near the outside and a large diameter part near the inside. a large-diameter flange that contacts the outer surface of the jacket through the large-diameter flange of the thin-film seal; a bottomless cylindrical portion that fits into the window via the bottomed cylindrical portion of the thin-film seal; It is characterized by comprising an overhang-shaped flange portion that fits into the step of the window via a bottomed cylindrical portion.

[Structure of the idea]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 4, a step 4-2 is formed on the inner circumferential surface of the window 4-1 of the cover 4, with a smaller diameter on the protruding side and a larger diameter on the inner side. As illustrated, the thin film seal 6 is formed into a bottomed cylindrical shape having a large diameter flange. As shown in FIG. 6, the thin film seal 6 is attached to the window 4-1 through the bottomed cylindrical portion of the thin film seal 6 to fix the thin film seal 6 to the window 4-1 in a liquid-tight manner. -1, and a large-diameter flange that contacts the end surface of the cover 4 through the large-diameter flange of the thin film seal 6. The window 4 is provided on the outer periphery of the fitting portion with 1.
By forming an overhang-shaped flange portion 10-1 having a shape corresponding to the step 4-2 in FIG. Ensure that a close mounting condition as shown in the figure is obtained.

[Effect of idea]

The viscous damper of the present invention has the great advantage of being able to extremely easily fix the thin film seal 6 to the window 4-1 in a liquid-tight manner with a single touch using the bushing 10.

[Brief explanation of drawings]

Figures 1a and b show a conventional viscous damper attached to a rotating machine, as well as a sectional view and a front view showing the internal structure of the damper, and Figure 2 shows a conventional viscous damper attached to a rotating machine. Third sectional view showing the state and internal structure of the damper
Figures a, b, and c are cross-sectional views for explaining the state of deformation due to changes in internal pressure of a thin film seal used to seal a window, Figure 4 is a schematic cross-sectional view of a window in an embodiment of the present invention, and Figure 5 is a cross-sectional view of the thin film seal, No. 6
The figure is a cross-sectional view of the bushing, and FIG. 7 is a cross-sectional view of the window section in an assembled state. 1... Rotating machine, 1-1... Shaft, 2... Viscous damper, 3... Case, 4... Cover, 4-1...
Window, 4-2... Step, 5-1, 5-2, 5-3...
...joint part, 6...thin film seal, 7...shaft bearing, 8...
...Fly foil, 9...Liquid, 10...Butching, 10-1...Brim portion, 11...Bung.

Claims (1)

[Scope of utility model registration request] A flywheel is rotatably disposed inside a sealed outer cover, a viscous liquid is sealed in the gap between the flywheel and the inner surface of the outer cover, a window is bored in a part of the outer cover, and a window is formed in a part of the outer cover. In a viscous damper sealed with a thin film seal that is easily deformable and impermeable to liquid,
The thin film seal is fixed to the window by bushing, and the thin film seal includes a large diameter flange that contacts the outer surface of the outer cover and a bottomed cylindrical portion that fits into the window, and the window has an inner peripheral surface thereof. The bushing has a step having a small diameter at a portion close to the outside and a large diameter at a portion close to the inside, and the bushing has a large diameter flange that contacts the outer surface of the jacket through the large diameter flange of the thin film seal, and a step between the thin film seal and the outer cover. a bottomless cylindrical part that fits into the window through the bottomed cylindrical part of the thin film seal; and an overhang-shaped collar part that fits into the step of the window through the bottomed cylindrical part of the thin film seal. A viscous damper characterized by: