JPS61116117A - Plain bearing - Google Patents

Abstract

PURPOSE:To make rotation accuracy preventable from lowering due to wear in a bush, by using a taper adjuster, while utilizing pressure of a fluid and giving preload to a bearing all the time. CONSTITUTION:When air is fed out of an X direction, a piston 12 is forcibly pressure to a taper jig 10 by dint of air pressure. This taper jig 10 and a split type bush 9 both have a split each whereby each of their inner diameters is contracted by force of the piston 12. That is to say, a clearance between the split type bush 9 and a rotary shaft 9 becomes narrowed, therefore the rotary shaft 8 performs sliding rotation together with the split bush 8 without any deflection. Accordingly, the split bush constantly holds constant force on the rotary shaft, thus rotational accuracy in the shaft or rollers, etc., is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sliding bearing that can rotate a shaft, rollers, etc. with small runout.

Conventional structure and its problems Conventional bearings that require high-precision rotation are, as shown in Figure 1, an angular pole bearing 2a on the rotating shaft 1;
2b and spacers 3 and 4 in the center to form an angular pole bearing 2a.

The rotating shaft 1 was held by applying preload to the inner ring of 2b using a spacer 3 and a bolt 5, and to the outer ring using a phthalo ring 7 and a spacer 4.

However, in the above configuration, no matter how large the preload is, there is a limit to eliminating the runout of the rotating shaft 1 due to dimensional errors between the bearing poles, machining errors in the inner rail, etc., and due to wear of the poles, etc. The preload changes,
It had the disadvantage that the accuracy changed.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the conventional bearings, and aims to provide an entire bearing mechanism with less runout.

Composition of the Invention The present invention provides a split-type push made of a bearing material that is inserted into a rotating shaft and has notches on the circumference in a cylinder tube, the outer periphery of which is machined into a tapered shape, and a plurality of splits that are equally spaced. A piston is inserted into a taper jig arranged at an angle, and a piston is combined so as to circumscribe the taper jig, and the piston is actuated by fluid pressure,
The taper jig is wedge-shaped and tightened into the piston, and at the same time, the split pusher constantly holds the rotating shaft with a constant force, which improves the rotation accuracy of the shaft or rollers, etc. In addition, it is possible to follow the wear of the split pusher and maintain rotation accuracy.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. 8 is a rotating shaft, 9 is made of a bearing material such as brass, and as shown in Fig.
) The split pusher 1o has a tapered outer periphery as shown in FIG. 11 is a seat for receiving the taper jig 10; 12 is a taper jig arranged at equal angles;
151L is a piston machined with an inner taper that is the same as the outer taper of the taper jig 10 to a suitable depth; 13 is a cylinder tube that holds the bearing of the present invention; 14 is a lid of the cylinder tube 13 having a fluid inlet; 151L .

The piston 12 and the cylinder tube 13 are inserted into the rotating shaft 8 together with the seat 11 15b. seat 1
1 prevents the split pusher 9 from being removed. on the other hand,
A cylinder is formed by the piston 12, cylinder tube 13, and lid 14, and is arranged so that the inner taper of the piston 12 and the outer taper of the taper jig 1o are in contact with each other.

When air is now supplied from the X direction, the piston 12 is pressed against the taper jig 10 by air pressure. The taper jig 10 and the split pusher 9 have a split 9 as shown in FIGS. 2 and 3, and the inner diameter is reduced by the force of the piston 12. In other words, the gap between the split mold push 9 and the rotating shaft 8 becomes smaller, and the rotating shaft 8 can move the split mold push 9 without swinging.
and rotate smoothly.

Effects of the Invention As described above, the present invention improves rotational accuracy by always tightening with a constant force using a combination of split die push and split die taper jig, and also uses taper alignment as a tightening method. By using fluid pressure to constantly apply a preload, it prevents rotation accuracy from decreasing due to push wear, which has a great effect on accuracy and maintenance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional sliding bearing, Fig. 2 is a sectional view of a sliding bearing according to an embodiment of the present invention, Fig. 3 is a perspective view of a split type push of the same bearing, and Fig. 4 is a sectional view of a sliding bearing according to an embodiment of the present invention. It is a perspective view of a tool. 9...Split type push, 10...Taper jig,
11... Seat, 12... Piston, 13.
...Cylinder tube, 14... Lid. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] Inside the cylinder tube, a split push made of bearing material that is inserted into the rotating shaft and has notches on the inner periphery is machined into a tapered outer periphery and multiple splits are arranged at equal angles. A piston is inserted into the jig and further circumscribed by the taper jig, and when the piston is actuated by fluid pressure, the taper jig is pressed into the piston in a wedge shape and tightened. The sliding bearing has a mechanism in which the split pusher is continuously held on the rotating shaft with a constant force at the same time.