JP2893754B2 - Bearing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bearing device having a built-in lubrication device.

[Prior Art] A conventional bearing device generally includes a lubrication device provided outside. Examples of the lubricating device include an oil mist lubricating device and an oil-air lubricating device.

In these lubricating devices, a mixture of fine particles of lubricant and air is supplied to the bearing device to lubricate the bearing portion, and the lubricant and the carrier (air) passing through the bearing portion are out of the bearing device. It is configured to discharge.

[Problems to be solved by the invention]

However, the bearing device provided with these lubrication devices has the following problems.

(1) Since the lubricating device is large and heavy, it is difficult to transport as well as take up space. Therefore, it is not suitable for mobile devices.

(2) The structure of the lubricating device is complicated, and the lubricating device requires a high-pressure air source and a power supply, which consumes a lot of energy and is expensive.

(3) Since the structure of the lubricating device is complicated, maintenance and inspection are difficult.

The present invention has been made in order to solve the above-described problems, and has a configuration in which a lubricating device is incorporated, thereby taking up little space, making it easy to carry, and therefore suitable for moving equipment and inexpensive. Another object of the present invention is to provide a bearing device which is easy to maintain and inspect.

[Means for solving the problem]

The bearing device provided by the present invention includes an axle box and a shaft attached to the axle box via a bearing so as to be relatively rotatable,
And the shaft has a lubricant storage tank on the outer periphery, the storage tank has a lubricant supply path on the shaft, and has a fine hole in a peripheral wall portion facing the inner peripheral surface of the shaft box, A minute gap is provided between the outer peripheral surface of the peripheral wall portion and the inner peripheral surface of the shaft box, and a spiral groove is provided on the rotating surface of the outer peripheral surface of the peripheral wall portion and the inner peripheral surface of the shaft box. In addition, a slinger is provided near the rotating side bearing of the shaft and the axle box.

[Action]

In the bearing device according to the present invention, when the lubricant is put into the storage tank through the supply path, the lubricant flows out into the minute gap between the outer peripheral surface and the inner peripheral surface of the shaft box through the fine hole in the peripheral wall portion. Or exude. This outflow or exudation is further promoted by rotation of the shaft. When the shaft (shaft box) rotates, the lubricant that has flowed out is supplied to the bearing by the pumping action of the spiral groove on the outer peripheral surface of the peripheral wall of the storage tank (the inner peripheral surface of the shaft box). At this time, the slinger promotes the supply of the lubricant to the bearing by the centrifugal force caused by the rotation of the shaft (shaft box). The lubricant used for lubrication is sequentially discharged out of the bearing device.
A substantial amount of the discharged and reduced lubricant can be replenished through the supply channel.

The pumping action of the helical groove causes a vacuum at the same time, facilitating the outflow or seepage of lubricant from the reservoir.

〔Example〕

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. This embodiment is a so-called horizontal bearing device in which a shaft is installed in a horizontal direction.

In the figure, 1 is a bearing, 2 is a shaft, and 3 is an axle box. The shaft 2 and the axle box 3 rotate relative to each other via the bearing 1. In this embodiment, the axle box 3 is fixed and the axle 2 rotates. Reference numerals 4,71,72,5,81,82 denote spacers for positioning the bearing 1. Reference numeral 73 denotes an annular nut screwed to the male screw of the shaft 2 to fix the spacers 4, 71, 72 to the shaft 2. Reference numeral 83 denotes an annular screw screwed to the female screw of the shaft box 3. These nuts are used to fix the spacers 5,81,82 to the shaft box 3. The spacers 4, 71, 72 and the nut 73 are fixed to the shaft 2 and substantially constitute a part of the shaft 2. Spacer 5,81,8
The nut 2 and the nut 83 are fixed to the axle box 3 and substantially constitute a part of the axle box 3.

Reference numeral 43 denotes a storage tank for the lubricant 9 integrally provided on the outer peripheral surface of the shaft 2. The storage tank 43 is disposed between the bearings 1 and 1, and has an annular spacer 4 provided with an annular groove 41 and a cylindrical peripheral wall portion integrally mounted on the spacer 4 so as to cover the groove 41. 42 to form a ring. The storage part of the lubricant 9 is formed in the inside. Therefore, this storage tank 43 is substantially
Is part of.

The peripheral wall portion 42 is provided with micropores by making it from a material having micropores or a porous material. The size, position and number of micropores, porosity of porous material,
The distribution, material, dimensions, and the like belong to the design items, and are appropriately determined according to the size, shape, rotation speed, oil supply amount, operating conditions, and the like of the bearing device.

422 is a spiral groove provided on the outer peripheral surface 421 of the peripheral wall portion 42 of the storage tank 43. A minute gap K is provided between the outer peripheral surface 421 of the peripheral wall portion 42 provided with the spiral groove 422 and the inner peripheral surface 51 of the spacer 5. 44 and 45 are slingers provided in spacer 4, and 711 and 721 are spacers
Slinger provided for 71 and 72. Both are formed near the bearing 1. Reference numeral 10 denotes a discharge path for the lubricant 9 provided between the spacer 71 and the spacer 81 and 11 between the spacer 72 and the spacer 82.

411 is a hole provided at the bottom of the groove 41 of the spacer 4, and 21 and 22 are holes provided on the shaft 2 and passing through the shaft 2. These three holes 411,2
Reference numerals 1 and 22 constitute a supply path 24 of the lubricant to the storage tank 43.
Reference numeral 23 denotes a stopper for the supply path 24.

The spiral groove 422 is designed to be wound in a direction that exerts an appropriate pumping action according to the rotation of the shaft 2.

That is, in this embodiment, as shown in FIG. 2, the spiral groove 422 is wound in the opposite direction to the left and right, and the lubricant 9 is supplied to the left bearing 1 and the right bearing by the pump action accompanying the rotation of the shaft 2. 1 can be supplied. Spiral groove 42
In this embodiment, the branch point in the left-right winding direction is the peripheral wall portion 4.
2 is set at the center in the width direction.

However, in general, the position of the branch point can be set to the most appropriate position according to conditions such as the size, shape, rotation speed, operating conditions, and supply amount of the lubricant 9 of the bearing device. Further, the condition number, pitch, torsion angle, direction, combination thereof, and the like of the spiral groove 422 can be appropriately set according to the same conditions.

 Next, the operation will be described.

Now, when the lubricant 9 is put into the storage tank 43 from the supply path 24, it flows out or oozes into the minute gap K through the minute hole of the peripheral wall portion. When the shaft 2 rotates in this state, the outflow of the lubricant 9 is further promoted by the centrifugal force at that time, and the outflowing lubricant 9 is transferred to the spiral groove 422 of the peripheral wall portion 42 of the storage tank 43. Is supplied to the left and right bearings 1 and 1 by the pumping action.

At this time, the slinger 44, 45, 711, 721 promotes the supply of the lubricant 9 to the left and right bearings 1, 1 by the centrifugal force accompanying the rotation of the shaft 2. The lubricant 9 used for lubrication is sequentially discharged out of the bearing device. In addition, the pump action of the spiral groove causes a vacuum at the same time, thereby promoting the outflow or seepage of the lubricant from the storage tank 43.

The amount of lubricant that has been discharged and reduced,
Can be replenished through.

(Example 2) Example 1 is an example in which the shaft 2 rotates, but when the axle box 3 rotates, a spiral groove is provided on the inner peripheral surface of the spacer 5,
If the slinger is provided in the spacers 81 and 82, the same function and effect can be expected.

A check valve, a check valve, a grease nipple, or the like can be used instead of the plug for the lubricant supply path in the above embodiment. The use of these makes it easier to replenish the lubricant and the like.

Further, although the above embodiment is directed to a horizontal bearing device, it goes without saying that the present invention can also be applied to a vertical or oblique bearing device.

〔The invention's effect〕

As described above, in the bearing device according to the present invention, the lubricant flowing or oozing out from the storage tank provided on the shaft or the axle box is pumped by the spiral groove provided on the storage tank, the axle or the axle box, and the action of the slinger. The following effect can be obtained since the bearing is fed to the bearing and lubricated.

(1) The lubricating device for the bearing is built in the bearing device, so that the bearing device is small and light as a whole, so that it can be easily transported in any place. Therefore, it is suitable for mobile equipment.

(2) It is inexpensive because it has a simple structure and does not require a high-pressure air source or a power supply for supplying lubricant.

(3) Since the structure is simple, maintenance and inspection are easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a first embodiment of the present invention, and FIG. 2 is a side view showing an embodiment of a spiral groove in a peripheral wall portion constituting a storage tank in FIG. 1 ... bearing 2 ... shaft 24 ... supply path 3 ... shaft box 42 ... peripheral wall 43 ... storage tank 422 ... spiral groove 44,45,711,721 ... slinger 73,83 ... nut 9 ... lubricant 10,11 …… Discharge channel

Claims (1)

(57) [Claims] An axle box and a shaft rotatably mounted on the axle box via a bearing, and the shaft has a lubricant storage tank on an outer periphery thereof, and the storage tank is provided with a shaft. It has a lubricant supply path, and has a fine hole in the peripheral wall facing the inner peripheral surface of the shaft box, and a minute gap is provided between the outer peripheral surface of this peripheral wall and the inner peripheral surface of the shaft box. Of the outer peripheral surface of the peripheral wall portion and the inner peripheral surface of the shaft box, a spiral groove is provided on the rotating surface, and a slinger is provided near the rotating bearing on the shaft and the shaft box. Bearing device.