Title:
CYLINDER IN ALUMINUM ALLOY AND ITS PREPARATION
Document Type and Number:
Japanese Patent JPS5551162
Kind Code:
A
Abstract:
PURPOSE:To facilitate manufacture, and to promote durability, by executing plating pre-treatment to a wall surface of a cylinder hole, by electrodepositing an iron layer on the wall surface by currents with high current density and by producing tortoise- shaped grooves to said iron layer. CONSTITUTION:An iron plating liquid contains 150-250g/l metal iron and 20- 50g/lboric acid, and its pH is 0.2-0.6 and its liquid temperature is 50-80 deg.C. Currents are conducted for 30-60 seconds while using this plating liquid. Thus, an iron layer with 20-80 micron thickness and 500-700 hardness Hv is electrodeposited. A large number of deep, tortoise-shaped grooves 5 are yielded to the iron layer 3. The grooves 5 house matter produced dur to wear and infinitesimal solid matter entering from the outside, and the damage of a sliding surface 6 can effectively be prevented by decreasing friction between the sliding surface 6 and an outer surface of a piston or an outer surface of a piston ring, thus providing a cylinder with excellent durability.
Inventors:
NINAGAWA CHIKATADA
OZAKI TADASHI
YONEKAWA MINORU
HARADA HITOSHI
OZAKI TADASHI
YONEKAWA MINORU
HARADA HITOSHI
Application Number:
JP12432578A
Publication Date:
April 14, 1980
Filing Date:
October 09, 1978
Export Citation:
Assignee:
KYORITSU KK
International Classes:
C25D3/20; F16J10/02; F16J10/04; (IPC1-7): F16J10/02
Domestic Patent References:
| JPS5240688A | 1977-03-29 | |||
| JP36007754A | ||||
| JPS5315011A | 1978-02-10 | |||
| JP30005063A |