JPS5939209Y2 - bearing - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing for high surface pressure used in construction machinery and the like.

Figures 1 and 2 show the structure and function of the conventional one.
FIG. 1 is a cross-sectional view, FIG. 1 and FIG. 2 are side views, and FIG. 2 is a cross-sectional view showing its operating situation.

In the figure, 1' is the pin, 2' and 3' are the frames that support the pin 1'', 4' is the bearing bushing housing, 5' is the bearing back metal, and 6' is the coating on the bearing back metal 5' with the same thickness b. It is a solid lubricant.

The load acts in the direction F, and the bearing bush housing 4' swings in the directions of arrows A and B.

However, when the load F acts on the bearing bush 4', since it is supported by the bin 1' frames 2' and 3', the second
Deflect as shown in the figure.

Therefore, the solid lubricant 6' coated on the bearing back metal 5' generates high surface pressure at both ends I, J of the bearing, and as shown in FIG. solid lubricant 6
There was a problem in that the pin (shaft) 1' came into direct contact with the bearing back metal 5', causing seizure.

In FIG. 2, the upper half above the center line shows the shape of the film after baking, and the half below the center line shows the film shape before use.

Therefore, the object of the present invention is to provide a bearing that eliminates the above-mentioned drawbacks and improves the life of the solid lubricant coating.

The feature of the present invention is that, instead of the conventional coating of solid lubricant on the inner peripheral surface of the bearing bushing having the same thickness in the axial direction, the present invention takes into account the deflection of the shaft and The thickness of the coating on the surface is made thicker than in the center of the bearing to prevent seizure on both end faces of the bearing and greatly extend the life of the solid lubricant coating.

An embodiment of the present invention will be described in detail below with reference to FIG.

FIG. 3 shows the structure of the present invention, and the figure is a sectional view.

The pin and pedestal are of conventional bearing construction as in FIG.

1 is a pin (shaft), 4 is a bearing housing, 5 is a bearing bushing (bearing back metal) that has a hole enlarged in the shape of a drum from the center of the bearing along the bearing end face, and 6 is a solid lubricant coated on the bearing back metal 5. It is a drug.

In the figure, the upper half of the center line shows the state when in use.
The lower half shows the state before use.

As described above, the coating thickness of the solid lubricant 6 at the center of the bearing is h, and gradually increases along the curvature of the shaft 1 toward the bearing end, and the coating thickness becomes H at the bearing end.

(H2h+δ, where the amount of shaft deflection at the bearing end is δ).

As described above, the solid lubricant 6 is coated on the inner circumferential surface of the bearing back metal 5, which has a hole enlarged in a drum shape from the center of the bearing along the end face of the bearing, so that the dimensions after coating have the same inner diameter.

Next, to explain its action, when the load F acts and sliding begins, the solid lubricant 6 coating on the end of the bearing wears out, causing the I
', J' part), the state is in the upper half of the center line in FIG. 3, and the state shifts to a steady state.

In conventional bearings, there was a problem that the shaft came into contact with the bearing backing metal at the bearing end, but in this embodiment, since the coating thickness at the bearing end is thicker, the shaft does not come into contact with the bearing backing metal 5.

Immediately after sliding starts, high surface pressure is applied to both ends of the bearing due to the deflection of the shaft 1, causing rapid wear of the bearing ends, but once the solid lubricant film wears out until it becomes the same shape as the curvature of the eaves 1. , an even contact pressure acts on the sliding surface (it is considerably lower than the contact pressure at the bearing end immediately after sliding starts).

) The amount of wear decreases and shifts to steady wear.

In the conventional type, abnormal wear at the bearing end causes the shaft to come into contact with the bearing back metal at the bearing end, causing seizure, resulting in a very short solid lubricant coating life. Focusing on the abnormal wear phenomenon of the bearing end due to the deflection of the shaft, the coating life can be improved by increasing the thickness of the solid lubricant 6 coating on the bearing end by the amount of shaft deflection.

In short, according to the present invention, a solid lubricant is coated on the inner circumferential surface of the bearing back metal, which has an enlarged drum-shaped hole from the center of the bearing along the bearing end surfaces, so that the inner diameter is the same. Seizing is prevented and the double film life of the solid lubricant is improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional bearing, Fig. 1 is a side view thereof,
FIG. 2 is a cross-sectional view showing its operating condition, and FIG. 3 is a cross-sectional view showing an embodiment of the bearing according to the present invention. 1...Shaft (pin), 4...Bearing housing, 5...Bearing bush (bearing back metal), 6...
...Solid lubricant.

Claims (1)

[Scope of utility model registration request] A bearing characterized in that a solid lubricant is coated on the inner peripheral surface of a bearing back metal having a hole enlarged in the shape of a drum from the center of the bearing along the end surface of the bearing so that the inner diameter is the same.