JPH07259856A - Plain bearing - Google Patents

Abstract

(57) [Summary] [Structure] The surface of the lining material 3 has a spiral protrusion 3a.
Are formed, and the entire surface of the lining material 3 is made of Ni.
The intermediate layer 4 made of
Is covered with an overlay layer 5 made of Sn alloy. As a result, the spiral protrusion 5a is formed on the sliding contact surface, the pitch p'is set to 0.1 mm to 0.4 mm, and the height h'of the protrusion 5a is set.
Is set to 2 μm to 8 μm. [Effect] It is possible to provide the sliding bearing 1 having excellent seizure resistance, fatigue resistance, and corrosion wear resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide bearing, and more particularly to a slide bearing having projections formed on a sliding contact surface at a predetermined pitch.

[0002]

2. Description of the Related Art Conventionally, a slide bearing having a projection formed on a sliding contact surface has been known (for example, Japanese Patent Laid-Open No. 2-38714).

[0003]

By the way, in the above-mentioned conventional slide bearing, the relationship between the pitch of the protrusions and the height has not been particularly taken into consideration. Therefore, when the inventor of the present application studied the pitch and height of the protrusions provided on the slide bearing, good bearing performance could be obtained with the following configuration.

[0004]

That is, according to the present invention, a plurality of projections extending in the circumferential direction are formed on the surface of a lining material at a predetermined pitch in the axial direction, and the entire surface of the lining material including the projections is covered with an intermediate layer. In the sliding bearing, the entire surface of the intermediate layer is covered with an overlay layer to form a projection on the surface of the overlay layer, that is, a sliding contact surface, following the projection of the lining material. Set the surface roughness of the material to 2 μm Rz to 8 μm Rz,
The intermediate layer is made of Ni, the thickness thereof is set to 0.01 μm to 0.6 μm, and the overlay layer is made of Sn of 99.5% or more by weight percent.
The balance consists of impurities and its thickness is 2μ.
m to 8 μm, the pitch p of the protrusions formed on the sliding contact surface is set to 0.1 mm to 0.4 mm, and the height h of the protrusions is 2 μm to 8 μm.
It provides a plain bearing set to.

[0005]

According to the above-mentioned structure, as can be understood from the experimental results described later, it is possible to provide a sliding bearing excellent in seizure resistance, fatigue resistance and corrosion wear resistance.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG.
A lining material 3 made of 1-Sn-Si alloy is provided. This lining material 3 is cast, cast-rolled, sintered,
It can be produced by an appropriate method such as extrusion. In the present embodiment, the lining material 3 contains 12% by weight of S.
n, 1.5% Pb, 0.3% Mn, 1% Cu,
It is made of an alloy composed of 0.2% V, 0.1% Sb and the balance Al. The surface roughness of the lining material 3 is set to 2 μmRz to 8 μmRz, and the surface of the lining material 3 has a predetermined pitch p and height h in the axial direction.
Form a spiral protrusion 3a continuous in the circumferential direction. In this embodiment, the pitch p is 0.1 mm to 0.4 mm.
And the height h is set to 2 μm to 8 μm. The protrusions 3a do not necessarily have to be spirally continuous, and may be annular protrusions provided at a predetermined pitch p in the axial direction. The entire surface of the lining material 3 is subjected to wet etching such as electrolytic etching, electroplating or sputtering,
The intermediate layer 4 made of Ni is coated by dry plating such as ion plating. The thickness t of this intermediate layer 4
1 is set to 0.01 μm to 0.6 μm.
Further, the entire surface of the intermediate layer 4 is covered with the overlay layer 5, and the thickness t2 of the overlay layer 5 is 2 μm.
It is set to m to 8 μm. Also, the overlay layer 5 is
It comprises 99.5% by weight or more of Sn and the balance of impurities. Therefore, in this embodiment, a spiral projection 5a is formed on the surface of the overlay layer 5, that is, the sliding contact surface of the slide bearing 1, which is similar to the spiral projection 3a of the lining material 3, and the projection 5a is formed. Has a pitch p ′ and a height h ′ that are the same as the pitch p and the height h of the protrusion 3a. Next, the test results of the bearing performance of the sliding bearing of the present embodiment will be described. 2 to 3 show the plain bearing 1 of the above-mentioned embodiment and the comparative materials a to be described below.
3 shows the results of tests performed on e with respect to fatigue resistance and corrosion wear resistance. Comparative material a: a structure in which the intermediate layer and the overlay layer in the present embodiment are omitted, that is, a sliding bearing in which only the same lining material as that in the above embodiment is provided on the surface of the back metal Comparative material b: the intermediate layer in the present embodiment Sliding bearings having a configuration omitted, that is, a backing metal surface provided with the same lining material as that of the above-mentioned embodiment and the surface thereof provided with the same overlay layer as that of the above-mentioned embodiment. Pitch p
(P ') is 0.2 mm and the height h (h') of the protrusion is 4
Slide bearing with μm Comparative material d: N serving as an intermediate layer in the configuration of the present embodiment
Sliding bearing in which the thickness of i was 2 μm Comparative material e: A sliding bearing in which the overlay layer in the configuration of the present example was composed of 7.5% Sn, 5.5% In, and the balance Pb in weight%. (Test conditions for fatigue resistance) Tester: Rotating load fatigue tester Rotation speed: 8000 rpm Shaft diameter: 42 mm Surface pressure: 290 Kg / cm ² Lubricating oil: 10W-30 SE class engine oil Lubricating oil temperature: 150 ° C Oil clearance: 25 ± 5 μm Shaft material: S50C quenching (Hv500) Shaft surface roughness: 0.5 μm The Rz test was conducted until fatigue cracks occurred in the plain bearing. (Test conditions relating to corrosion wear resistance) Rotation speed: 6000 rpm (no load) Shaft diameter: 42 mm Surface pressure: 290 Kg / cm ² Lubricating oil: 7.5 W-30 SE class engine oil (no replacement, replenishment only) Lubricating oil temperature : 150 ° C. Oil clearance: 25 ± 5 μm Shaft material: S50C quenching (Hv500) Shaft surface roughness: 0.5 μm Rz A crankshaft of a gasoline engine with a displacement of 1600 cc with four in-line cylinders is rotatably supported by sliding bearings and after every 200 hours The amount of wear on the sliding contact surface of the slide bearing was measured. As can be understood from FIGS. 2 to 3, the invention product and the comparative material e are the most excellent in fatigue resistance, and the invention products and the comparative materials a to c are excellent in corrosion wear resistance, and the fatigue resistance is It is only the product of the present invention that is excellent in corrosion resistance and corrosion resistance. As is clear from the above-mentioned test results, the sliding bearing of this example is excellent in seizure resistance, fatigue resistance and corrosion wear resistance.

[0007]

As described above, according to the present invention, it is possible to improve the seizure resistance, fatigue resistance and corrosion wear resistance of the sliding bearing.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a slide bearing showing an embodiment of the present invention.

FIG. 2 is a diagram showing test results of fatigue resistance of the product of the present invention and a comparative material.

FIG. 3 is a diagram showing test results of corrosion wear resistance of the product of the present invention and a comparative material.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sliding bearing 2 ... Back metal 3 ... Lining material 3a ... Protrusion 4 ... Intermediate layer 5 ... Overlay layer t1 ... Surface roughness of lining material 3 t2 ... Thickness of intermediate layer 4

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Katsuyuki Hashizume 3-65 Midorigaoka, Toyota-shi, Aichi Otoyo Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A plurality of projections extending in the circumferential direction are formed on the surface of a lining material at a predetermined pitch in the axial direction, the entire surface of the lining material including the projections is covered with an intermediate layer, and the surface of the intermediate layer is further covered. In a sliding bearing in which the entire surface is covered with an overlay layer to form protrusions on the surface of the overlay layer, that is, the sliding contact surface, following the protrusions of the lining material, the surface roughness of the lining material is 2 μm Rz to 8 μm.
Rz is set, the intermediate layer is made of Ni, and the thickness thereof is set to 0.01 μm to 0.6 μm, and the overlay layer is 99.5% by weight.
In addition to being composed of the above Sn and the remaining impurities, the thickness thereof is set to 2 μm to 8 μm, and the pitch p of the protrusions formed on the sliding contact surface is 0.
A slide bearing characterized in that the height h of the protrusion is set to 2 μm to 8 μm while being set to 1 mm to 0.4 mm.