Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Patent
1998-05-26
2000-09-05
Knight, Anthony
Seal for a joint or juncture
Seal between relatively movable parts
Piston ring or piston ring expander or seat therefor
277460, 277474, F16J 920
Patent
active
061131075
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to a piston ring for an internal combustion engine or an air compressor, in particular, to a self-lubricated and -adjusted piston ring.
BACKGROUND OF THE INVENTION
After having been worn out, a piston ring and a cylinder liner are subject to an insufficient sealing betweenwith, and an insufficient compression in the cylinder, whereby resulting in, when an engine is running, a waste of fuel, a reduced power output, as well as difficulty to cold restarting of a stopped engine. In the internal combustion engine industry, piston rings are considered to be parts that wear out quickly. The efforts for increasing the service life of piston rings have been concentrated on improvement in anti-abrasion materials and producing processes for manufacturing them. But insufficient sealing is mainly caused by worn-out liners or rings. The piston rings replaced frequently because they wear out replacing the piston rings required, wherein dismounting and then mounting the engine, resulting in a waste of time and labor and influences its service. The inventors of this invention provided a piston compression ring assembly as a solution to overcome the above problems (China Patent No. 75790). However, the lubrication of the assembly, is not good enough, and also needs further improvements.
SUMMARY OF THE INVENTION
An object of the invention is to provide a self-lubricated and self-adjusted piston compression ring with longer service life in order to improve the above mentioned poor lubrication and to overcome the vulnerability of abrasion.
To achieve the above object, the piston rings of this invention are so arranged that each set of the rings consist of a preliminary ring member and a secondary ring member, which engage each other on their respective smooth sides. Cross sections of the preliminary and secondary ring members are in the form of a trapezoid or rectangle with an angular nick. A notch for accommodating lubricant oil is combined of the nicks. Inner and outer diameters of the preliminary ring member are equal to those of the secondary ring member respectively.
BRIEF DESCRIPTION IN DRAWINGS
Thereafter the invention is illustrated with the aids of attached drawings, wherein,
FIG. 1 is a schematic half cut away view showing a self-lubricated and -adjusted piston compression ring arranged on a piston according to the invention;
FIG. 2 is a schematic top view showing a circumferential relation of radial cuts among rings being mounted on a piston according to the invention;
FIG. 3 is a section view along A--A direction on FIG. 2;
FIG. 4a is a cross section view of a notch in a form of R for accommodating lubricant oil in an embodiment according to the invention;
FIG. 4b is a cross section view of a notch in form of V for accommodating lubricant oil in an another embodiment according to the invention; and
FIG. 4c is a cross section view of a notch in form of U for accommodating lubricant oil in a still another embodiment according to the invention.
Thereafter embodiments according to the invention are illustrated in detail with reference to the attached drawings, wherein the reference numbers in the drawings are interpreted as follows:
1--Piston; 2--Oil Checking Ring; 3--Pin Hole in the Piston
4--Preliminary Ring Member; 5--Secondary Ring Member.
As shown in the drawings, two oil checking rings and three piston compression rings are arranged on a piston in an internal combustion engine in X195 Serial made in China.
Conventionally, one oil checking ring and two piston compression rings, or one oil checking ring and three piston compression rings, or two oil checking rings and three piston compression rings, are mounted on a piston in other serials. In general, two or three piston compression rings each with a single radial cut are arranged on an average piston. Two piston compression rings are arranged on a piston (not at the same level) in a circumferential span of 180.degree., while three compression rings are in a span of 120.degree..
Whereas, a self-lubri
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patent: 3774920 (1973-11-01), Sievenpiper
Cai Ping
Cai Xiaoshan
Wang Baodong
Xue Chuansi
Zhang Yumin
Knight Anthony
Pickard Alison K.
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