JPH0133851Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a support device for a vertical rotating body, and more specifically, to a support device that improves the vibration stability of such a rotating body.

<Prior Art> As a conventional supporting device for a vertical rotating body, there is one shown in FIG. 2, for example. This support device includes a bearing 2 that receives the shaft end of the rotating body 1, and a movable damper plate 3 to which the bearing 2 is fixed. This movable damper plate 3 is placed in a housing 4 filled with fluid such as oil, and the lower surface of the movable damper plate is placed on a stationary surface 4a at the bottom of the housing 4 via a plurality of balls 5, and is movable. The damper plate 3 is supported while maintaining a narrow gap from the stationary surface 4b of the inner step of the housing. The plurality of balls 5 are rotatably positioned at equal intervals from each other by a ring-shaped retainer 6 having holes equal to the number of balls.

According to the rotation support device as described above, when the rotating body 1 vibrates due to unbalance, the movable damper plate 3 also vibrates following the vibration, but the movable damper plate 3 is Since the viscous force of the oil acts on the movable damper plate 3 in the narrow gap between it and the still image 4b, a damping force is applied to the movable damper plate 3 to attenuate its vibration, thereby causing rotation. Vibrations of the body 1 can also be damped.

At this time, if the plurality of balls supporting the movable damper plate 3 are shifted to one side, the movable damper plate 3 is tilted and cannot move smoothly, so the balls are positioned at equal intervals from each other by a retainer.

<Problems to be solved by the invention> However, as shown in FIG. 2, the ball retainer 6 in the conventional device is constructed by placing a ring-shaped member with holes equal to the number of balls on the stationary surface 4a at the bottom of the housing 4. Since it is configured to be mounted, the contact area between the lower surface of the retainer 6 and the stationary surface 4a becomes relatively large. As a result, the viscous force of the oil restricts the smooth sliding of the retainer 6 on the stationary surface 4a, preventing smooth movement of the balls, which in turn impairs the movement of the movable damper plate 3, causing the rotating body 1 This weakens the damping force against vibrations and causes unstable vibrations such as self-excited vibrations to occur.

Therefore, this invention eliminates the drawbacks of the conventional device as described above, and provides an excellent system that allows the ball cage to slide smoothly on a stationary surface without reducing the damping force against vibrations of the rotating body. The purpose of this invention is to provide a rotating body support device with vibration stability.

<Means for solving the problem> According to this invention, instead of bringing the entire bottom surface of the ball cage into contact with the stationary surface as in the past, a plurality of minute protrusions are provided on the bottom surface of the ball cage to make the ball cage contact with the stationary surface. The above object is achieved by substantially point-contacting the ball retainer with these microprotrusions. Such point contact can reduce the viscous force of the oil present between the lower surface of the ball retainer and the stationary surface, and prevent the retainer from interfering with the smooth movement of the balls.

<Example> This invention will be further explained with reference to the example shown in FIG. In FIG. 1, the same members as those in the conventional device shown in FIG. 2 are given the same reference numerals as in FIG. 2, and the explanation thereof will be omitted. According to this invention, the thickness of the ring-shaped ball retainer 16 is made slightly smaller than that of the conventional ball retainer, and a plurality of minute protrusions 16a are provided at appropriate locations on the lower surface of the ring-shaped ball retainer 16 to project downward.

The material of the retainer 16, including the minute protrusions 16a, can be made of metal, but if it is made of fluororesin such as tetrafluoroethylene resin, the coefficient of friction will be small, and the force of restraining the balls by the retainer will be further reduced. This is preferable because it can be done.

<Effects of the invention> Since this invention has the above-mentioned configuration, smooth sliding of the ball cage on the stationary surface is ensured, and as a result, when vibration occurs in the rotating body, the vibration follows the vibration. A damping force can be reliably applied to the movable damper plate, and vibrations of the rotating body can be effectively damped.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the vertical rotating body support device of this invention, and FIG. 2 is a sectional view showing a conventional device. DESCRIPTION OF SYMBOLS 1... Rotating body, 2... Bearing, 3... Movable damper plate, 4... Housing, 4a... Stationary surface, 5...
...ball, 16...retainer, 16a...microprotrusion.

Claims (1)

[Claims for Utility Model Registration] 1. Comprising a bearing 2 for receiving the shaft end of a vertical rotating body 1 and a movable damper plate 3 to which the bearing is fixed,
In a support device for a vertical rotating body, the lower surface of the movable damper plate is placed on a stationary surface 4a via a plurality of balls 5, and each ball is rotatably positioned by a ball retainer 16 and at equal intervals from each other. A supporting device for a vertical rotating body, characterized in that a plurality of microprotrusions 16a are provided on the lower surface of the ball retainer so that the stationary surface and the ball retainer come into point contact through the microprotrusions. 2. The support device according to claim 1, in which the ball retainer 16 and the microprotrusions 16a are made of fluororesin.