JPH0768972B2 - Bearing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bearing device for an electric energy meter that requires low friction torque, for example.

[Conventional technology]

FIG. 2 is a sectional view of a conventional ball bearing of this type. In the figure, 1 is a main shaft, 2 is a jewel bearing mounted on the main shaft 1, 3 is a ball, 4 is a jewel bearing mounted on a bearing retainer 5, 6 is a spring which gives an appropriate contact pressure to the bearing portion,
Reference numeral 7 is a holder, and 8 is a nut for fixing the stroke of the bearing retainer. In addition, the above jewelry bearings 2, 4 and balls 3
An appropriate amount of oil is applied between them.

Next, the operation will be described. The rotation of the main shaft 1 turns around the jewel bearing 2, the ball 3 and the jewel bearing 4 as fulcrums.
Lubricated by a certain amount of oil supplied during initial assembly during 4 The contact pressure is adjusted by the bearing retainer 5 and the spring 6.

[Problems to be Solved by the Invention]

In this conventional bearing structure, it is difficult to inject oil while the bearing is in use, since only a certain amount of oil is supplied during the structure. When the rotation of the main shaft 1 becomes unstable, the behavior of the ball 3 becomes unstable, and it makes a shock contact with the jewel bearings 2 and 4 to cause vibration, and the vibration is expanded by the spring 6 to generate a sound. There was a problem that caused.

The present invention has been made to solve the above problems, and when a rotational force of a certain torque or more is generated during use of a bearing, oil is automatically supplied to reduce the frictional force, Another object of the present invention is to obtain a bearing device capable of suppressing vibrations by utilizing the viscous resistance of oil even when the main shaft makes eccentric motion.

[Means for Solving the Problems]

A bearing device according to the present invention supports a main shaft by using two bearings, and arranges a rotor shaft having a spiral groove in an intermediate portion thereof.

[Action]

In the present invention, the main shaft is supported by the two bearings via the rotor, and the rotor rotates due to the difference in rotational torque between the two bearings, supplying oil to the bearings.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, 1 is a main shaft, A is an upper bearing which is arranged at the lower end of the main shaft 1 and directly supports the main shaft, 2 is an upper jewel bearing, 3 is a ball, and 4 is a lower jewel bearing. Reference numeral 7 is a holder (housing), 9 is an intermediate rotor shaft which supports the main shaft 1 via the upper bearing A and has a spiral groove 10 formed on the periphery thereof, and B is arranged at the lower end of the rotor shaft 9 to support the rotor shaft. 11 is an upper gem bearing embedded under the rotor shaft 9, 12 is a ball, 13 is a lower gem bearing, and this lower gem bearing 13 is a holder 7
It is embedded in the bearing retainer 14 supported by. Reference numeral 8 is a nut for setting and fixing the bearing retainer 14 at an appropriate position. Reference numeral 15 denotes a pump chamber between the rotor shaft 9 and the side wall of the holder 7, which is filled with oil 16.

The operation of the self-lubricating bearing device configured as described above will be described. The main shaft 1 is supported by a rotor shaft 9 via an upper bearing A, and the rotor shaft 9 is further supported by a lower bearing B. The pump chamber 15 is filled with oil, and the lower bearing B is constantly lubricated. Further, the rotor shaft 9 has a constant rotational torque due to the viscous resistance of oil. Here, when the rotational torque of the upper bearing becomes equal to or greater than the rotational torque due to the viscous resistance of the rotor, the rotor is attracted by the rotation of the main shaft and rotates. At this time, the pressure in the upper part of the pump chamber 15 increases due to the axial flow pumping action of the spiral groove 10 provided on the rotor shaft 9, and the oil flows upward from the gap between the holder 7 and the rotor shaft 9,
Lubricate the upper bearing A. As a result, the friction coefficient of the upper bearing decreases, the rotation of the rotor shaft 9 stops, and only the main shaft 1 rotates. Due to these effects, it is possible to constantly give a constant rotating torque and an appropriate self-lubricating effect to the main shaft due to the viscosity of the oil in the pump chamber.

Furthermore, since the inside of the holder is filled with oil, minute vibrations of the main shaft and the rotor shaft are absorbed by the viscous resistance of the oil, which is also effective in suppressing sound generation.

In addition, in the above embodiment, the watt hour meter was described,
Not only the vertical type bearing having the pivot bearing but also the radial type bearing can be used.

〔The invention's effect〕

As described above, according to the present invention, the main shaft is supported by the upper and lower two bearings at the time of the intermediate rotor, and the spiral groove having the axial flow pump action is formed around the intermediate rotor shaft, so that the proper rotation can be achieved. Effective for effective refueling and anti-vibration.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional bearing device. In the figure, 1 is a main shaft, 7 is a holder, 9 is an intermediate rotor shaft,
10 is a spiral groove, 15 is a pump chamber, 16 is oil, A is an upper bearing, and B is a lower bearing. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A main shaft is supported by two upper and lower bearings in a holder, and an intermediate rotor shaft rotatable relative to the main shaft is arranged between these two bearings.
A spiral groove having an axial flow pump action is formed on the outer periphery of the intermediate rotor shaft, and a pump chamber communicating with the upper bearing is formed between the holder and the intermediate rotor shaft to fill the pump chamber with lubricating oil. Bearing device.