JPS6241425A - Halved plain bearing - Google Patents

Abstract

PURPOSE:To make it possible to preserve a good lubricating condition when an oil film formation is inferior at the time of start-up of an engine, by covering the inner periphery surface of a bearing with a solid lubricant layer having abrasion resistance, in a halved plain bearing for a motor car or the like. CONSTITUTION:As for a halved plain bearing 1, a sliding bearing member 1b made of such as lead bronze alloy, aluminum tin alloy, aluminum lead alloy, aluminum silicone alloy, ceramics or the like is fixed to its back plate 1a made of steel and the inner periphery surface of the sliding bearing member 1b is covered with a heat resistant solid lubricant layer 1e such as fluoro resin or molybdenum doxide or the like. And then the thickness of the solid lublicant layer 1e is desiable to be approximate 0.3-2mum. Further, to cover the inner periphery surface of the sliding bearing member 1b with a solid lubricant layer 1e, it is usually done by such methods as to execute an electrodepositing or spraycoating or the like with the solid lubricant after roughtening the surface by physical or chemical means.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a half-split flat bearing with excellent surface properties.

(Prior Art) Conventional half-plane bearings used in automobile engines and the like are shown in FIGS. 5 to 8.

The half-split flat bearing 1' shown in Fig. 5 has a steel backing metal 1'a,
A bearing material t'b made of lead-bronze alloy, aluminum-tin alloy, aluminum-lead alloy, aluminum-silicon alloy, ceramics, etc. is fixed.

The half flat bearing τ shown in FIG. 6 has an overlay layer formed by plating the inner peripheral surface of the half flat bearing 1' with a lead-tin alloy or a lead-indium alloy. That is, the reference numeral ``a'' is a steel back metal, 21b is a beveled bearing material, and 2'C is an oats-an-lay layer.

The half-flat bearing y shown in FIG. 7 has a flash layer 3'd formed by thinly plating lead-tin alloy, tin-zinc alloy, or tin on the inner peripheral surface of the half-flat bearing 1'.

That is, 3'a is a steel back metal, 3'b is a steel bearing material, and 3'd is a flash layer.

A half-flat bearing 4' shown in FIG. 8 has a flash layer provided on the inner circumferential surface of the half-flat bearing 2, similar to the half-flat bearing 3'. That is, 4'a is a steel back metal, 4'b is a beveled bearing material, 4'c is an overlay layer, and 4'd is a flash layer.

(Problems to be Solved by the Invention) In the conventional half-flat bearing as described above, there is a problem in which the surface layer seizes due to insufficient oil lubrication when the engine is started due to long engine stoppages. There is. In addition, as engines become faster and more powerful, the bearings become hotter, especially under conditions that are not conducive to oil film formation, and the bearing metal contains lead and tin, which have low melting points, so it softens and flows, leading to seizure. There is a concern that this may lead to corrosion, and there are also problems with the corrosion resistance of lead. Therefore, it is desired to develop a half-split flat bearing that is superior in reducing frictional resistance during engine startup, which is inferior to oil film formation, and also has superior frictional resistance, heat resistance, and corrosion resistance at high speeds and under high loads.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned circumstances, and it provides a half flat bearing in which the inner circumferential surface of the bearing is coated with a heat-resistant solid lubricant layer. be.

(Function) Solid lubricants have self-lubricating properties, and when the shaft is fused with the solid lubricant layer that coats the inner circumferential surface of the bearing, and when an oil film is formed during engine startup, etc. The self-lubricating properties of the solid lubricant also allow the shaft and bearings to maintain good lubrication.

(Example) An example according to the present invention will be described based on FIGS. 1 to 4.

The half flat bearing 1 shown in FIG. 1 has a steel backing 1a and a plain p bearing material 1b constructed in the same manner as the half plain bearing 1', and the inner circumferential surface of the plain bearing material 1b is made of fluorine resin or It is coated with a heat-resistant solid lubricant layer 1e such as molybdenum sulfide.

The half flat bearing 2 shown in FIG. 2 has a steel backing metal Za, a flat bearing material 2b and an overlay layer 2C constructed in the same manner as a half flat bearing. The inner circumferential surface is coated with a heat-resistant solid lubricant layer 2e such as a fluorine-based resin or molybdenum disulfide.

The half flat bearing 3 shown in FIG. 3 has a metal backing 3a, a plain bearing material 3b, and a flash layer 3d configured in the same manner as the half flat bearing y, and the inner circumferential surface of the flash layer 3d is made of fluorine resin or It is coated with a solid lubricant layer 3e having heat resistance such as molybdenum disulfide.

The half flat bearing 4 shown in FIG. 4 has a steel backing 43, a plain bearing material 4b, an automatic lay layer 4C, and a flash layer 4d in the same manner as the half flat bearing 4'. The inner peripheral surface is coated with a heat-resistant solid lubricant 4e such as a fluorine-based resin or molybdenum disulfide.

The thickness of each solid lubricant layer 1e, 2e, 3a, 4e is preferably 0.3 μm to 20 μm.

In addition, the flat bearing material 1b of the half-split flat bearing, or the automatic lay layer 2c, or the flash layer 3d.

In order to coat the inner peripheral surface of 4d with the solid lubricant layer 1e, 2e, 3c, or 4e, each surface is usually roughened physically or chemically and the solid lubricant is electrodeposited or sprayed. Although it can be done by a method such as coating, the method of coating is not limited.

Next, the effect will be explained.

Each of the half flat bearings 1, 2, 3.4 slides on the rotating shaft with a heat-resistant solid lubricant layer 1e, 2g, 3e, 4e. Good lubrication is achieved due to self-lubricating properties when the formation of

Next, an experimental example will be explained.

Conventional product A is a half-split flat bearing 2 consisting of a steel backing metal 2'a, a copper-lead alloy 2'b, and a lead-tin overlay layer 2'c, as shown in Fig. 6, and is a test product. B1 is a half-split flat bearing 2 shown in FIG. 2 coated with a steel backing metal 2a, a copper-lead alloy 2b, a lead-tin organic layer 2c, and a fluorine-based resin 2e as a solid lubricant to a thickness of 3 μm, sb, and test specimen B2. is a half-split flat bearing coated with 3 μm of molybdenum disulfide 2e as a solid lubricant in test specimen B1.

Then, 8 pieces of conventional product A, 8 pieces of test product B1, and 8 pieces of test product B
A wear test was conducted for 40 hours using four pieces of No. 2 under the following conditions.

Rotation speed: 3500 rpm Surface pressure: 560 K, 9f/i bearing back temperature = 175°C Lubricating oil a: sxE2ow-4°Hydraulic pressure: 3 K,! ilf/ci This result is 4
The number of cases in which the test was stopped due to seizure within 0 hours was 4 out of 8 for conventional product A and 2 out of 8 for test product B1.
Test product B had none.

Figure 9 shows the amount of wear after the 40 hour test.

In terms of wear amount, both test products B and B showed a remarkable decrease compared to the conventional product, and test product B in particular showed good results.

(Effects of the Invention) As understood from the above explanation, in the half-split flat bearing according to the present invention, since the solid lubricant layer slides on the shaft, especially when starting the engine, the formation of a special oil film is poor. The self-lubricating property provides a good lubrication state, and the transfer to the shaft side reduces wear on the bearing metal.

[Brief explanation of the drawing]

1, 2, 3, and 4 are diagrams showing material layers of an embodiment of a half-split flat bearing according to the present invention, and FIGS. 5, 6, and 7, respectively.
8 are diagrams showing the material layers of a conventional half-plane bearing, respectively, and FIG. 9 is a diagram showing the results of a wear test. la, 2m, 3m, 4a: Steel back metal, lb, 2b, 3
b. 4b: Subbed bearing material, 2e, 4c Nioverlay layer,
3d, 4d: flash layer, le, 2e, 3e, 4e
:Solid lubricant layer. Representative Patent Attorney 1) Toshiyuki (and 1 other person) Happy 5th figure
Figure 6 Figure 9 82 B1 A

Claims (1)

[Claims] 1. A half-flat bearing characterized in that the inner peripheral surface of the bearing is coated with a heat-resistant solid lubricant layer.