JPH0554822U - Plain bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To enable self-circulating lubrication with a simple structure and low cost. [Structure] A spiral continuous oil groove (11) is formed in the inner peripheral surface (10I) of the bush (10) and opens toward the outer peripheral surface of the rotating shaft (8) and extends along the axis of the rotating shaft (8). The outer peripheral surface of the rotating shaft (8) and the inner peripheral surface (10I) of the bush (10) are oil-tightly sealed outside the front end (11L) and the rear end (11R) of the continuous oil groove (11). And continuous oil groove (11)
The front end (11L) and the rear end (11R) are connected by a pipe (15).

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a slide bearing having a bush fitted between a stationary body and a rotary shaft.

[0002]

[Prior Art]

 Plain bearings are widely used in all types of machinery and equipment due to their simple structure. The structure of such a slide bearing will be described when it is used in the C-frame press machine shown in FIG.

In FIG. 1, a crankshaft (rotating shaft) 2 having an eccentric portion 3 is supported at both ends by a slide bearing formed by fitting a bush 10 between a frame (stationary body) 1 and a rotating shaft (2). Has been done. Further, the bush 10 is also fitted to the eccentric portion 3, and the connecting rod [the rotating shaft (3) is considered to be a stationary body on the outside thereof. ] 6 is fitted and also forms a plain bearing. In addition, 4 is a key and 5 is a main gear.

Lubrication of each slide bearing is performed by selecting either the grease lubrication method or the forced circulation lubrication method in consideration of the magnitude of the load or the rotation speed of the rotating shaft (2). ..

[0005]

[Problems to be solved by the device]

 However, although the grease lubrication method is simple, it cannot be collected, and the grease leaks out, impairing the appearance. Further, there is a disadvantage that it is not suitable for high speed rotation. On the other hand, the forced circulation lubrication method solves the problems of the grease lubrication method, but it is expensive because it requires the installation of oil tanks, pumps, safety devices, and other equipment. There is also a drawback that the layout space becomes large.

An object of the present invention is to provide a plain bearing which has a simple structure and can be lubricated and supplied at low cost.

[0007]

[Means for Solving the Problems]

 A slide bearing according to the present invention is a slide bearing in which a bush is fitted between a stationary body and a rotating shaft, wherein the bush has an inner peripheral surface that opens toward an outer peripheral surface of the rotating shaft and that has the rotating shaft. Is provided with a spiral continuous oil groove extending along the axis of, and the outer peripheral surface of the rotary shaft and the inner peripheral surface of the bush are oil-tightly sealed outside the leading end and the rear end of the continuous oil groove. It is characterized in that the front end and the rear end of the continuous oil groove are connected by a pipe.

[0008]

[Action]

 In the present invention having the above-described configuration, oil is filled in the oil-sealed continuous oil groove and the communication pipe. Here, when the rotary shaft makes a rotational movement, the continuous oil groove has a spiral shape, and thus the oil moves around the continuous oil groove along with the rotary shaft from the front end side to the rear end side due to its viscosity. It is then circulated through the pipe. Therefore, oil can always be stably supplied between the rotating shaft and the bush.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. First Embodiment This first embodiment is shown in FIG. 1 and constitutes a slide bearing for rotatably supporting the middle of the rotary shaft 8.

In FIG. 1, the sliding bearing comprises a stationary body (bearing) 9 and a bush 10 fitted between the stationary body 9 and the rotary shaft 8. On the inner peripheral surface 10I of the bush 10, a continuous oil groove 11 extending in the axial direction of the rotary shaft 8 is spirally provided. The continuous oil groove 11 opens toward the outer peripheral surface of the rotary shaft 8.

An oil supply port 12L is provided at the tip 11L of the continuous oil groove 11, and an oil drain port 11R is provided at the rear end 11R. The oil supply port 12L and the oil discharge port 11R are connected by a pipe 15. Outside the front end 11L and the rear end 11R, the outer peripheral surface of the rotary shaft 8 and the inner peripheral surface 10I of the bush 10 are oil-tightly sealed by seal members 20L and 20R. Therefore, oil can be filled in the circulation system including the continuous oil groove 11, the oil supply / discharge ports 12L and 12R, and the pipe 15.

When the rotary shaft 8 rotates in a predetermined direction, the oil vibrates around the rotary shaft 8 due to viscosity, and the oil flows in the spiral continuous oil groove 11 from the left side to the right side in FIG. 1 in this embodiment. Move to. Then, it flows through the oil discharge port 12R and the pipe 15 and is circulated again to the oil supply port 12L.

This self-circulation becomes stronger as the rotation speed of the rotary shaft 8 is higher and the viscosity of the oil is higher. Of course, the pressurized oil is constantly renewed and supplied between the bush 10 and the rotary shaft 8.

Therefore, according to this embodiment, the spiral continuous oil groove 11 is provided on the inner peripheral surface 10I of the bush 10, and the front end 11L and the rear end 11R of the bush 10 are connected and connected by the pipe 15 and their outer sides. Since the oil-tight seals (20L, 20R) are used, it is possible to use the rotational movement of the rotary shaft 8 to self-circulate the oil. Therefore, compared to the conventional forced circulation lubrication system, the structure is simple and the cost is low, and the circulation performance is always smooth and stable.

As shown by the chain double-dashed line in FIG. 1, the life of oil can be extended by providing an oil tank 16 in the middle of the pipe 15. Alternatively, the middle of the continuous oil groove 11 and the pipe 15 may be connected by a branch pipe 15 '.

Second Embodiment A second embodiment is shown in FIG. This is the case of a slide bearing that supports one end of the rotating shaft 8. In such a structure, an oil chamber 21 is provided in the stationary body (bearing) 9, and this oil chamber 21 forms one seal member and a part of the continuous oil groove 11.

Therefore, in the case of this embodiment as well, in addition to the same operational effect as in the case of the first embodiment, a relatively large amount of oil can be stored in the oil chamber 21, so that a more stable self-circulation can be performed. ..

[0018]

[Effect of the device]

 According to the present invention, a spiral continuous oil groove is provided on the inner peripheral surface of the bush, and the tip and the rear end of the bush are communicatively connected by a pipe and oil-tightly sealed on the outside thereof. Self-circulating refueling can be performed by utilizing the rotary motion. Therefore, compared to the conventional forced circulation lubrication system, the structure is simple and the cost is low, and the circulation performance is always smooth and stable.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a second embodiment of the present invention.

FIG. 3 is a side sectional view for explaining a conventional example.

[Explanation of symbols]

 1 Frame 2 Crankshaft 3 Eccentric part 8 Rotating shaft 9 Stationary body (bearing) 10 Bushing 10I Inner peripheral surface 11 Continuous oil groove 11L Tip 11R Rear end 12L Oil supply port 12R Oil discharge port 15 Piping 16 Oil tank 20L, 20R Sealing member 21 Oil chamber (fuel filler, seal member)

Claims (1)

[Scope of utility model registration request] 1. A plain bearing having a bush fitted between a stationary body and a rotary shaft, wherein the bush has an inner peripheral surface that opens toward an outer peripheral surface of the rotary shaft and that is axially aligned with the rotary shaft. A spiral continuous oil groove extending along is provided, and the outer peripheral surface of the rotary shaft and the inner peripheral surface of the bush are oil-tightly sealed outside the front end and the rear end of the continuous oil groove, and the front end of the continuous oil groove is formed. A plain bearing characterized in that the rear end and the rear end are connected by piping.