CN200975290Y

CN200975290Y - Diesel engine thin wall cylinder sleeve

Info

Publication number: CN200975290Y
Application number: CN 200620011123
Authority: CN
Inventors: 李友谊; 陈玲; 赵瑞安
Original assignee: HUAICHAI-HUAFENG POWER Co Ltd SHANDONG
Current assignee: Huafeng Power Co., Ltd.
Priority date: 2006-10-18
Filing date: 2006-10-18
Publication date: 2007-11-14
Anticipated expiration: 2016-10-18

Abstract

The utility model discloses a thin wall cylinder cover for the diesel engine, which is composed of a cylinder cover body, the wall thickness of which is 5.0 to 6.0mm, the cylinder cover body is a spherical graphite iron noumenon containing pearlite; the prior art that the intensity of the casting iron cylinder cover is not suitable to the requirement of the thin wall cylinder cover is overcome, the cylinder extending can be performed because the power is increased and the reliability of the diesel engine is guaranteed. The technical flow is simple, and the material of the cylinder cover is of a low cost; and the basic organization of the pearlite spherical graphite iron body is a tight and rubbery pearlite whose intensity is three times higher than the normal casting iron; the utility model is of a good corrosion resistance, and the durability of which is once higher than the normal casting iron.

Description

Diesel engine thin-wall cylinder casing

Technical field

The utility model relates to a kind of diesel cylinder sleeve.

Background technique

Diesel engine is divided into dry cylinder liner diesel engine and wet cylinder liner diesel engine by its type of cooling, and the wet cylinder liner diesel engine is because its anufacturability is good, and cost of production is low, and is widely used.The wet cylinder liner diesel engine, under the prerequisite that does not change cylinder core distance and piston stroke, the size of cylinder sleeve internal diameter has determined the output power of diesel engine, so engineers and technicians improve diesel engine power by the technological means that expands cylinder (increase cylinder bore), and therefore reduces the diesel engine manufacture cost.

A technological means that expands cylinder enlarges the cylinder sleeve internal diameter exactly, because the restriction of cylinder sleeve intensity, internal diameter expands certain limit to just can not continue to expand cylinder, and it is less that this mode improves power of IC engine.

Requirement along with further raising power, another technological means that expands cylinder is the external diameter that also enlarges cylinder when enlarging cylinder bore, this method has guaranteed the intensity of cylinder sleeve, but its shortcoming is the cooling space that has dwindled cylinder sleeve external refrigeration water, worsened the operating conditions of diesel engine, the cylinder sleeve external diameter expands to a certain degree in addition, because the restriction of cylinder core distance also reaches capacity easily.

In the prior art, the cylinder sleeve of common wet cylinder liner diesel engine adopts boron cast iron, boron casting in bronze iron, chromium aluminum bronze cast iron, high phosphorus alloy cast iron, high-phosphorous iron, high-load chrome molybdenum nickel cast iron, chromium molybdenum copper boron alloy cast iron, cylinder liner body internal surface cure process adopts heat treatment process such as nitrocarburizing, laser, surface high frequency quenching, chromium plating, carries out honing processing and forms platform reticulate pattern in body internal surface (hardness HB207～360) then.More than two kinds expand the cylinder modes and on the basis of Cast iron liner, carry out, but its shortcoming is for satisfying requirement of strength, the cylinder sleeve wall thickness is generally more than 6.5mm, can not further expand cylinder to improve power, and bigger wall thickness has tied up the circulation passage space of cooling medium, reduce the cooling effect of diesel engine, and therefore reduced the working efficiency of diesel engine.

The model utility content

Technical problem to be solved in the utility model provides a kind of cylinder that can further expand under the same conditions to improve diesel engine power, reliable operation and cooling effect diesel engine thin-wall cylinder casing preferably.

For achieving the above object, the technical solution of the utility model is: diesel engine thin-wall cylinder casing, comprise the cylinder sleeve body of hollow, and the wall thickness of described cylinder sleeve is 5.0-6.0mm, described cylinder sleeve body is for containing pearlitic spheroidal graphite cast iron cylinder sleeve body.

Owing to adopt technique scheme, diesel engine thin-wall cylinder casing comprises the cylinder sleeve body of hollow, and the wall thickness of described cylinder sleeve is 5.0-6.0mm, and described cylinder sleeve body is for containing pearlitic spheroidal graphite cast iron cylinder sleeve body; Overcome the requirement of prior art medium cast iron cylinder sleeve because of intensity incompatibility thin-wall cylinder casing, thereby reached diesel engine because of increasing the reliability that power expands cylinder and guarantees diesel engine, required technology is simple, lower-cost cylinder sleeve material; And the matrix of pearlite ductile iron cylinder liner is fine and close tough pearlite, and the about Senior Three of strength ratio plain cast iron intensity doubly; Corrosion stability is good, and wear resistance is than plain cast iron cylinder sleeve double approximately (after the internal surface enhancement process or adopt isothermal quenching technique, its overall performance has bigger raising).

Description of drawings

Accompanying drawing is the utility model embodiment's a structural representation.

Embodiment

As shown in drawings, diesel engine thin-wall cylinder casing comprises the cylinder sleeve body of hollow, and the wall thickness of described cylinder sleeve 1 is 5.0-6.0mm, and described cylinder sleeve body is for containing pearlitic spheroidal graphite cast iron cylinder sleeve body.

Make the method for above-mentioned diesel engine thin-wall cylinder casing, may further comprise the steps:

First step casting blank: cast the tubulose cylinder liner blank;

The second step normalizing: cylinder liner blank is come out of the stove after 60-90 minute 880-940 ℃ of following constant temperature insulation,, adopt air cooling, air-cooled or mist is cold according to ambient temperature;

The 3rd step tempering: the cylinder liner blank after the normalizing is come out of the stove after 60-90 minute 550-600 ℃ of following constant temperature insulation, then natural cooling;

The 4th step processing: the cylinder liner blank processing after adopting machinery with tempering;

The 5th step bore area cure process: cure process is carried out on the cylinder sleeve bore surface that processes, can adopt heat treatment process such as nitrocarburizing or laser hardening or surface high frequency quenching, or adopt isothermal quenching technique.

The 6th step honing: adopt honing device with the inboard wall of cylinder liner plateau honing cross hatches.

Embodiment one: as shown in drawings, endoporus is the cylinder sleeve of Φ 105mm, according to reliability requirement, use the alloy cast iron cylinder sleeve, minimum wall thickness (MINI W.) should be more than 6.5mm, under the situation that is subjected to the cylinder core distance restriction, the cooling channel reduces greatly, and adopting wall thickness is the pearlitic ductile iron cylinder sleeve of 6.0mm, through laboratory endurance test in 1000 hours, diesel engine performance reaches designing requirement, and water temperature stability is within scope of design.

Embodiment two: as shown in drawings, endoporus is the cylinder sleeve of Φ 110mm, according to reliability requirement, use the alloy cast iron cylinder sleeve, minimum wall thickness (MINI W.) should be more than 6.5mm, if be used in high-power or marine diesel engine on the cylinder sleeve minimum wall thickness (MINI W.) should be more than 7.5mm, cylinder core distance limits and alloy cast iron cylinder sleeve wall thickness can not guarantee under the situation of reliability requirement being subjected to, adopt the pearlitic ductile iron cylinder sleeve, wall thickness is 5mm, through laboratory endurance test in 1000 hours, diesel engine performance reaches designing requirement, and water temperature stability is within scope of design.

Tear machine testing after the off-test open, obvious cavitation pitting does not take place in cylinder sleeve, measures cylinder sleeve bore greatest wear value 0.018mm, average abrasion value 0.01mm; The average 0.01mm of cylinder-liner distortion amount; Piston ring gap clearance compression increase value 0.125mm, average increase value 0.086; Piston ring gap clearance oil control increase value 0.115, average increase value 0.104.

Claims

1. diesel engine thin-wall cylinder casing comprises the cylinder sleeve body of hollow, and it is characterized in that: the wall thickness of described cylinder sleeve (1) is 5.0-6.0mm, and described cylinder sleeve body is for containing pearlitic spheroidal graphite cast iron cylinder sleeve body.

2. diesel engine thin-wall cylinder casing as claimed in claim 1 is characterized in that: the wall thickness of described cylinder sleeve (1) is 6.0mm.

3. diesel engine thin-wall cylinder casing as claimed in claim 1 is characterized in that: the wall thickness of described cylinder sleeve (1) is 5.0mm.