CN102900560A

CN102900560A - Diamond-like carbon membrane piston ring

Info

Publication number: CN102900560A
Application number: CN2012102391176A
Authority: CN
Inventors: 吕万杰
Original assignee: Zhejiang Poli Auto Spare Parts Manufacturing Co Ltd
Current assignee: Zhejiang Poli Auto Spare Parts Manufacturing Co Ltd
Priority date: 2012-07-05
Filing date: 2012-07-05
Publication date: 2013-01-30

Abstract

The invention discloses a diamond-like carbon membrane piston ring and aims to provide the diamond-like carbon membrane piston ring which is better than an existing piston ring in aspects of abrasive resistance, elasticity, and bonding strength between a diamond-like carbon membrane layer and a base piston ring material. A multi-layer type interlayer is sequentially bonded on the outer layer of the base piston ring material, and a diamond-like carbon membrane is covered on the outer periphery of the interlayer. The diamond-like carbon membrane piston ring is characterized in that the interlayer comprises a chromium nitride layer and a titanium carbide layer which are sequentially bonded on the outer sphere of the base piston ring material. A transition structure with a hardness gradient gradually increasing from the core to the surface of the piston ring enables the surface of the piston ring to have high hardness, especially have great elasticity and higher bonding strength with the base material, so that great low-abrasion speed and low-friction factor are realized, and the diamond-like carbon membrane piston ring meets requirements of environmental protection and is long in service life.

Description

The quasi cobalt carbon diaphragm piston ring

Technical field

The present invention relates to the piston ring that motor is used, say more specifically a kind of wear-resistant, low friction factor quasi cobalt carbon diaphragm piston ring.

Background technique

Present in-engine piston normally with the friction component in road, two roads to three, such as compression ring, oil ring, claims piston ring usually.Compression ring wherein is the annular solid design that is strip, and be installed on the piston, and form closed state between the cylinder, oil ring in cylinder except playing sealing, it mainly has been the effect of frizing behind the cloth oil, be unlikely to the machine oil overflow in the firing chamber, because the oil film of cylinder wall is supplied by oil ring, and engine at work, oil ring is to be responsible for the unnecessary machine oil of countercylinder wall to striking off, and traditional piston ring is deposited certain deficiency at bulk strength and elastic effect, so that poorly sealed, the probability of loss is relatively high, and shorten working life, and work as oil ring because of strength deficiency, elastic effect is not good, the top layer face is not done special processing, and when the phenomenon that abrasion is arranged produces, cause the consumption of machine oil large, also be that engine is when beginning burn oil, when the piston tightness not good, relatively cause the combustion efficiency step-down, even it is unstable the engine running to occur, the situation of difficulty in starting affects effective output of engine power.

Because piston ring is in relative motion at a high speed with cylinder always; in order to reduce the wearing and tearing of piston ring; there is now structure to adhere to a diamond-like carbon films at the top layer of piston ring face; to improve the hardness of piston ring surface; utilize this quasi cobalt carbon diaphragm layer to the protection of piston ring; prevent that piston ring from wearing and tearing too early, with the working life of jigger lifting piston ring.But nonetheless, the adhesive strength of the wear resistance of its piston ring, elasticity, working life and diamond-like carbon films and piston ring base material etc. or unsatisfactory.

Summary of the invention

The purpose of this invention is to provide a kind of better quasi cobalt carbon diaphragm piston ring of adhesive strength than existing piston ring wear resistance and elasticity and diamond-like carbon films and piston ring base material.

In order to reach above-mentioned requirements technological scheme of the present invention be: at the base material skin of this piston ring sequentially in conjunction with the mesosphere with multiple layer, outer periphery in the mesosphere covers a diamond-like carbon film again, it is characterized in that described mesosphere is to comprise with the base material skin at piston ring sequentially to be combined with chromium nitride layer, titanium carbide layer.

Be provided with hard chromium layers between described base material skin and the chromium nitride layer.

Described piston ring refers to compression ring or oil ring.

Quasi cobalt carbon diaphragm piston ring according to the such scheme design, the transition structure that the core of this piston ring increases to the gradual change of surface hardness gradient, make the surface of piston ring that higher hardness be arranged, especially make it that preferably elasticity is arranged, has very high combination force with base material, reach better low abrasion speed, low friction coefficient, and meet the long lifetime diamond-like carbon film piston ring of environmental regulation.

Description of drawings

Fig. 1 is the stereogram of invention piston ring;

Fig. 2 is the piston ring that mesosphere of the present invention is comprised of chromium nitride layer, titanium carbide layer, the partial cross section figure when contacting with cylinder wall;

Fig. 3 is at the partial enlarged drawing at A place among Fig. 2;

Fig. 4 is the piston ring that mesosphere of the present invention is comprised of hard chromium layers, chromium nitride layer, titanium carbide layer, the partial cross section figure when contacting with cylinder wall;

Fig. 5 is at the partial enlarged drawing at B place among Fig. 4.

Among the figure: 1, ring body; 2, spring; 3, the recessed section of putting; 4, breach; 5, concave ring groove; 6, open-work; 7, base material; 8, mesosphere; 9, diamond-like carbon film; 10, chromium nitride layer; 11, titanium carbide layer; 12, hard chromium layers.

Embodiment

The invention will be further described below in conjunction with accompanying drawing with by embodiment.

The piston ring structure form of the present invention design is with the oil ring of engine inner carrier ring as embodiment as shown in Figure 1, it comprise a ring body 1, and a spring 2 consist of, coil spring 2 wherein is to be close to the recessed section 3 of putting that is set in ring body 1, forming the breach 4 with extension at ring body 1 one ends, is the concave ring groove 5 that is recessed into and be provided with the open-work 6 of a plurality of circumferential distributions in the bottom of concave ring groove 5 in the outer periphery of ring body 1.

Fig. 2, Fig. 3 are the cross-sectional views of this piston ring, as seen from the figure, at base material 7 skins of ring body 1 sequentially in conjunction with the mesosphere 8 with multiple layer, 8 outer periphery covers a diamond-like carbon film 9 again in the mesosphere, and base material 7 skins that described mesosphere 8 is included in piston ring sequentially are combined with chromium nitride layer 10, titanium carbide layer 11.Also can also be at described base material 7 be provided with hard chromium layers 12 such as Fig. 4, shown in Figure 5 between 10 layers of the outer and chromium nitrides.

Said structure is so that the hardness gradient that the piston ring top layer face that consists of obtains different hardness layer layer structure gradually, that is hardness 7 interfaces from the piston ring face to the base material are progressively reduction, with reach better low abrasion speed, low friction coefficient, and and base material 1 between have than high-bond, can effectively prevent peeling off of diamond-like carbon film 9, prolong the working life of piston ring.

Above-described embodiment just to the hardness gradient of oil ring gradually a layer structure be described, certainly, comprise yet that the hardness gradient of other piston ring has this gradually protection domain of also listing this patent in of layer structure, such as the oil ring of compression ring, other structural types etc.

Claims

1. quasi cobalt carbon diaphragm piston ring, at the base material skin of this piston ring sequentially in conjunction with the mesosphere with multiple layer, outer periphery in the mesosphere covers a diamond-like carbon film again, it is characterized in that described mesosphere is to comprise with the base material skin at piston ring sequentially to be combined with chromium nitride layer, titanium carbide layer.

2. quasi cobalt carbon diaphragm piston ring according to claim 1 is characterized in that being provided with hard chromium layers between described base material skin and the chromium nitride layer.

3. quasi cobalt carbon diaphragm piston ring according to claim 1 is characterized in that described piston ring refers to compression ring or oil ring.