JPS6286198A - Cylinder for internal combustion engine - Google Patents

Abstract

PURPOSE:To develop a cylinder having a sliding surface which has self-lubricity and is highly resistant to wear by forming many fine grooves on the inside surface of a cylinder for an internal combustion engine, depositing a dispersion plating film in the grooves and forming recesses for holding a lubricating oil. CONSTITUTION:The fine grooves 2 having 5-500mum width and 5-500mum depth are formed on the inside sliding surface of the cylinder 1 for the internal combustion engine at a ratio of 10-50% of the area of the inside sliding surface. The self-lubricating dispersion plating film 3 consisting of Ni-P-BN or Ni-BN and having 5-100mum thickness is deposited to the inside surface of the grooves 2 and the fine recess 4 to hold the lubricating oil is formed to the surface thereof. Such inside surface in the sliding part of the cylinder has the excellent self-lubricity by holding the lubricating oil in the recess 4 and has the excellent wear resistance by sliding with a piston.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to cylinders for internal combustion engines. More specifically, the present invention relates to a cylinder for an internal combustion engine that has sliding surfaces that are self-lubricating, have excellent wear resistance, and have excellent lubricant retention properties.

b. Conventional technology In order to make the piston slide smoothly and to prevent wear due to friction with the piston, lubricating oil is supplied to the sliding surface of the cylinder of an internal combustion engine, and hard material is applied to the sliding surface of the cylinder. Countermeasures have been taken such as applying a chromium plating film or a dispersion plating film formed by eutectoiding hard 16 particles, lubricating fine particles, etc. to a matrix of nickel, cobalt, etc.

Problems to be Solved by the C0 Invention However, even with the above method, sufficient effects in terms of wear resistance and self-lubricating properties cannot be expected.

The inventors of the present invention have made extensive studies to obtain a sliding surface that has higher wear resistance and retains lubricating oil better, and as a result, the inventors have created fine grooves on the sliding surface that retain lubricating oil. The inventors have discovered that the above object can be achieved by forming a concave portion for retaining lubricating oil by breaking the dispersion plating film in the groove, and have arrived at the present invention.

Means for Solving Problem d1, that is, the present invention, in order to achieve the above object, has a width of 5 to 500 μm and a depth of 5 to 500 μm on the sliding surface of the cylinder.
The area occupied by the groove on the sliding surface is 10 to 5 μm.
0%, and a plating film rg5~10 is applied to this.
The present invention provides a cylinder for an internal combustion engine, which is coated with a self-lubricating dispersion plating film of 0 μm and has minute recesses on its sliding surface that hold 18 lubricating oil.

The cylinder of the internal combustion engine of the present invention can be manufactured by machining or the like.
It can be obtained by carving grooves of predetermined dimensions on the sliding surface and then applying self-irradiated dispersion plating to a predetermined thickness on the surface.

The grooves have a width of 5 to 500 μm and a depth of 5 to 500 μm, and are uniformly distributed on the sliding surface so that the area occupied by the grooves is 10 to 50% of the area of the sliding surface. to form. Its cross-sectional shape has a thickness of 5 to 100 μm on the surface.
It is not particularly limited as long as it has a shape that forms fine recesses that can hold lubricating oil when a self-lubricating dispersion plating film is applied thereto.

In FIG. 1, 1 is a cylinder, 2 is a groove, 3 is a plating film, 4 is a formed minute recess, and 5 is lubricating oil held in the recess 4. The above 42 is, for example, from FIG. 2(A) to
It has a cross-sectional shape as shown in (D), and has a pattern as shown in Figures 3 (^) to (D), and has a cross-sectional shape of
Carve uniformly over the main part or the entire sliding surface at a ratio of 50%.

In addition, self-lubricating dispersion plating can be used, for example, with Ni-BN (
BN: boron nitride) plating or N1-P-BN
Plating is used, and the plating film thickness is 5 to 100. +1m.

Preferably it is 10 to 50 μm, and is carried out, for example, by the following plating method.

Plating bath composition: (nickel sulfamate bath) nickel chloride: N1CJz ・6LO15g/e boric acid
: Ih[lOx 45 g/1
Sodium saccharin: 3g/l boron nitride (hexagonal crystalline fine particles) 20g/l plating conditions, valley 1 = 50~60°C current density: 10
~20 A/dm” Plating time: 2-40 m1n.

Anode: Temporary electrolytic nickel (using an anode bag) II↑
・The cylinder of the internal combustion engine of the present invention, which is configured as above, uses a heating method using a cathode rocker and air agitation. Lubricating oil 5 is retained,
This allows the piston to slide smoothly and improve wear resistance.

r8 Effects of the Invention In the cylinder of the internal combustion engine of the present invention, a plating film adheres to the grooves cut into the sliding surface to form a recess, and the recess has lubricating oil retaining properties. Therefore, the cylinder of the internal combustion engine of the present invention has excellent lubricant retention properties and is less prone to scuffing. Furthermore, since it has a self-lubricating dispersion plating film, it also has excellent wear resistance.

[Brief explanation of drawings]

FIG. 1 is an enlarged schematic sectional view illustrating the sliding surface of the cylinder of the internal combustion engine of the present invention, and FIGS. An enlarged longitudinal sectional view showing the shape, and FIGS. 3(A) to (D>) are schematic diagrams showing patterns of grooves carved on the sliding surface. ■...Sliding surface, 2...Groove, 3 ... Self-lubricating dispersion plating film, 4 ... Concavity, 5 ... Lubricating oil. Patent applicant Suzuki Motor Corporation (and one other person)

Claims (1)

[Claims] (1) The sliding surface of the cylinder has a width of 5 to 500 μm and a depth of 5
The area occupied by the groove on the sliding surface is 1
0 to 50%, and then plated with a thickness of 5 to 50%.
Cylinder for an internal combustion engine characterized by having a self-lubricating dispersion plating film of 100 µm in thickness and having minute recesses formed on the sliding surface to retain lubricating oil (2) The plating film is made of nickel-phosphorus. A cylinder for an internal combustion engine according to claim 1, comprising a boron nitride or nickel-boron nitride dispersion plating film.