CN201835933U

CN201835933U - Six-cylinder natural gas fuel engine

Info

Publication number: CN201835933U
Application number: CN201020261056XU
Authority: CN
Inventors: 支大新
Original assignee: HONG KONG HENGLI INDUSTRIAL Co Ltd
Current assignee: Punctuality Consulting Co. Ltd.
Priority date: 2010-07-16
Filing date: 2010-07-16
Publication date: 2011-05-18
Anticipated expiration: 2020-07-16

Abstract

The utility model discloses a six-cylinder natural gas fuel engine. A quenching layer with hardness of HRC 43 plus or minus 3 and depth of 0.6mm to 1.5 mm is arranged on the inner peripheral edge of the intake valve of an engine cylinder cover, a stellite layer with hardness of 30HRC to 40 HRC and depth of 0.8mm is arranged on the outer peripheral edge of the intake valve which is matched with the cylinder cover intake valve, a flow guide pit with depth of 2.95 mm is arranged at the top of the piston of the engine, and the volume of the flow guide pit is 13.33mL. The six-cylinder natural gas fuel engine retains high dynamic performance, and the decrease of power torque is basically controlled within 10 percent; and the engine greatly improves durability, and the average continuous running life is over 6,000 hours.

Description

6 cylinder natural gas fueled engines

Technical field

The utility model relates to 4.4 liters 6 cylinder natural gas fueled engines.

Background technique

Motor car engine is by body, connecting rod, distribution device, cooling system, lubricating system, compositions such as fuel system and igniting system.The working procedure of motor is to utilize piston to move back and forth to finish a work cycle, comprises air inlet, compression, work done, four processes of exhaust.Available engine has two kinds of gasoline and diesel engine by the fuel branch.And along with the further developing of society, rock gas has become the green clean energy resource of a kind of safety and environmental protection, super quality and competitive price compared to gasoline, diesel oil.And along with increasingly sharpening of pollution of atmosphere, the exhaustion day by day of petroleum resources, remaining high of gas price, the cheap relatively rock gas of cost is as the cleaning alternative fuel, get more and more people's extensive concerning day by day, yet the existing motor car engine that is applicable to gasoline has following problem if directly use rock gas:

1, use rock gas instead after because rock gas belongs to the dried fuel of gaseous state, do not have lubrication property, cause being dry friction between intake valve and the valve port, thereby cause the premature wear of engine intake valve and valve port serious.

2, use rock gas instead after, because rock gas is a vaporized fuel, this occupies certain volume ratio fuel in cylinder, the air quantity that causes sucking cylinder reduces, charging efficiency descends, and the air quantity that sucks cylinder has reduced the also corresponding minimizing of Fan Ying fuel with it, therefore cause the engine power moment of torsion to descend, fall is about 15% to 20%.

The model utility content

In view of this, the purpose of this utility model is to provide a kind of 6 cylinder natural gas fueled engines that can effectively address the above problem, motor of the present utility model adds through improving its structure on the basis of existing 6 cylinder gasoline engines, makes it be applicable to gas material.

6 cylinder natural gas fueled engines in the utility model are that one deck hardness is set is that HRC43 ± 3, the degree of depth are the quench hardened case of 0.6-1.5mm to the inlet valve port inner circumference edge at engine cylinder cap, simultaneously in the intake valve outer periphery that cooperate with described cylinder head inlet valve port one deck hardness being set is that 30-40HRC, the degree of depth are the stellite layer (Stellite) of 0.8mm, it is 2.95 millimeters water conservancy diversion pit that the piston head of described motor is provided with the degree of depth, and the volume of this water conservancy diversion pit should be 13.33 milliliters mutually.

Stud with Wear-resistant, high-temperature resistant alloy seat ring in the exhaust doorway of described engine cylinder cap, in the exhaust valve outer periphery that cooperate with described cylinder head exhaust doorway one deck hardness being set is that 30-40HRC, the degree of depth are the stellite layer of 0.8mm.

The outer periphery of described intake valve and exhaust valve are processed with the groove that is used for the described stellite layer of built-up welding.

Described quench hardened case is shaped via the direct quenching of high frequency hardening head.

Described stellite layer is positioned at the annular sealing strip place of described intake valve or exhaust valve outer periphery.

6 cylinder natural gas fueled engines in the utility model have not only kept higher power performance, and power moment of torsion fall basic controlling is in 10%, and endurance quality then is greatly improved, and average running life continuously was above 6000 hours.

Description of drawings

Fig. 1 is that the master of 6 Cylinder engines in the utility model looks schematic representation;

Fig. 2 is positioned at the cross-sectional schematic at inlet valve port place for engine cylinder cap in the utility model;

Fig. 3 is the enlarged diagram of part shown in the A among Fig. 2;

Fig. 4 is the structural representation of intake valve or exhaust valve in the utility model;

Fig. 5 is the structural representation of thermostat in the utility model;

Fig. 6 is the structural representation of thermostat in the utility model;

Fig. 7 is the part cross-sectional schematic of piston in the utility model.

Embodiment

The specific embodiment of the utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1,6 Cylinder engines in the utility model are identical with the structure and the working principle of existing 6 cylinder gasoline engines, because 6 cylinder gasoline engines are mature technologies, therefore each parts and the working principle to motor is not described in detail, and only the improvements of doing at 6 cylinder gasoline engines is described in detail below.

At first, because rock gas belongs to the dried fuel of gaseous state, there is not lubrication property, cause easily between valve and the valve port dry friction taking place, for this reason, as shown in Figures 2 and 3, at inlet valve port 2 inner circumference edges of engine cylinder cap 1 one deck hardness being set is that HRC43 ± 3, the degree of depth are the quench hardened case 3 of 0.6-1.5mm, simultaneously in intake valve 4 outer periphery that cooperate with cylinder head 1 inlet valve port 2 one deck hardness being set is that 30-40HRC, the degree of depth are the stellite layer 5 of 0.8mm, as shown in Figure 4.The quench hardened case 3 of cylinder head 1 is to utilize the high frequency hardening head that each inlet valve port 2 is quenched successively, and the metallographic structure of quench hardened case 3 mainly is a martensite.The outer periphery of intake valve 4 are that the annular sealing strip place forms groove by machining earlier, insert the stellite layer 5 of built-up welding again in groove, and the degree of depth of this built-up welding is 0.8mm.Because stellite is a kind of high temperature resistant, anti abrasive Materials with High Strength, behind the built-up welding stellite, makes the wear-resisting property of intake valve sealing strip be largely increased.

Equally, also do same the processing in the outer periphery of the exhaust valve of cylinder head 1, to cooperate the Wear-resistant, high-temperature resistant alloy seat ring that studs with in the engine cylinder cap exhaust doorway with intake valve.

Secondly, as shown in Figure 7, do not do change for keeping original cylinder head, cylinder body and bent axle machining line, the structure of each piston 8 is improved, the degree of depth that is about to the water conservancy diversion pit 9 at piston 8 tops is kept to 2.95 millimeters, and the volume that makes water conservancy diversion pit 9 is 13.33 milliliters.Because after the volume of piston 8 top water conservancy diversion pits 9 reduced, whole combustion chamber volume is corresponding to be reduced, compression ratio brings up to present 9.5 by original 9.0.Can effectively reduce the decline degree of using power behind the rock gas, moment of torsion instead.

In addition,, can do further optimization, just make the cam angle of intake and exhaust change 103.5 degree into, be equivalent to inlet and exhaust valve and open overlapping angle and reduce 2 Shaft angles of writing music by 104.5 to the cam profile and the port timing of motor in order further to improve power and moment of torsion.The locating stud of motor and the first cylinder exhaust cam angle change 4.83 degree into by 3.25 degree, are equivalent to the exhaust valve angle of advanced opening and postpone 3.2 Shaft angles of writing music, and whole port timing is also whole postpones 3.2 Shaft angles of writing music.After port timing is adjusted, the pairing rotating speed point of Maximum Torque further is offset to the low speed direction, the charging efficiency and the maximum torque of the middle low speed of original gasoline engine model are further enhanced, thereby partial offset gasoline change behind the rock gas and reduce the moment of torsion fall that causes because of charging efficiency; Simultaneously, suitably improve engine compression ratio,, promote power, the moment of torsion of original gasoline engine model comprehensively by improving the engine combustion thermal efficiency, thus power, loss of machine of torque that the part compensation descends and brings because of charging efficiency.

Except that the reinforcement of above-mentioned necessity improved, the motor of using rock gas instead and be raw material can also further improve following content, but because these improve all is to adopt market ripe, therefore only did simple declaration:

1, adopt the platinum spark plug, behind the employing platinum spark plug, required ignition voltage reduces, but spark is stronger than common spark plug, and ignition performance is stable, has eliminated the phenomenon of catching fire substantially.

2, replace original roller chain with compound tooth-shaped chain, reduced the transmission noise, prolong the working life of chain.

3, the cooling system of motor generally is made up of water tank, water pump, radiator, fan, thermostat, water-thermometer and cock of water drain, the throttle orifice diameter of thermostat is increased to 33mm by original 27mm, as shown in Figure 5 and Figure 6, thereby can make flow increase about 50%, the first temperature of opening that makes motor is reduced to 80 ℃ by original 87 ℃; The standard-sized sheet temperature is reduced to 93 ℃ by original 100 ℃, the cold air effect be improved significantly.

Improve through above-mentioned reinforcement, adopt gas material after, not only kept higher power performance, power moment of torsion fall basic controlling is in 10%, and endurance quality then is greatly improved, average running life continuously was above 6000 hours.

The above is a preferred embodiment of the present utility model only, is not to be used for limiting to claim of the present utility model, and the equivalent structure that all utilization the utility model specifications and accompanying drawing content are done changes, and all in like manner is contained in the scope of the present utility model.

Claims

1. cylinder natural gas fueled engines, it is characterized in that, at the inlet valve port inner circumference edge of engine cylinder cap one deck hardness being set is that HRC43 ± 3, the degree of depth are the quench hardened case of 0.6-1.5mm, simultaneously in the intake valve outer periphery that cooperate with described cylinder head inlet valve port one deck hardness being set is that 30-40HRC, the degree of depth are the stellite layer of 0.8mm, it is 2.95 millimeters water conservancy diversion pit that the piston head of described motor is provided with the degree of depth, and the volume of this water conservancy diversion pit should be 13.33 milliliters mutually.

2. 6 cylinder natural gas fueled engines according to claim 1, it is characterized in that, the exhaust doorway of described engine cylinder cap studs with Wear-resistant, high-temperature resistant alloy seat ring, and in the exhaust valve outer periphery that cooperate with described cylinder head exhaust doorway one deck hardness being set is that 30-40HRC, the degree of depth are the stellite layer of 0.8mm.

3. 6 cylinder natural gas fueled engines according to claim 2 is characterized in that the outer periphery of described intake valve and exhaust valve are processed with the groove that is used for the described stellite layer of built-up welding.

4. 6 cylinder natural gas fueled engines according to claim 2 is characterized in that, described quench hardened case is shaped via the direct quenching of high frequency hardening head.

5. 6 cylinder natural gas fueled engines according to claim 2 is characterized in that described stellite layer is positioned at the annular sealing strip place of described intake valve or exhaust valve outer periphery.