CN201250712Y - Gasoline engine - Google Patents

Abstract

The utility model relates to a gasoline engine which comprises a cylinder body, crankshafts, a plurality of air cylinders arranged in the cylinder body, pistons, connecting rods and a cylinder cover, wherein the pistons are respectively arranged in the air cylinders and reciprocate, one end of each connecting rod is hinged on a piston, and the other end of each connecting rod is hinged on a crankshaft; combustion chambers in a number matched with that of the air cylinders are arranged on the cylinder cover, and each combustion chamber is provided with at least two intake valves, at least two exhaust valves and a spark plug hole; a cylinder sleeve is arranged in each air cylinder and is tightly matched with the inside diameter of the air cylinder, and the material of the cylinder body adopts lighter material different from that of the cylinder sleeve so that the whole engine is lighter and more compact. Meanwhile, the rotating speed of the engine can be increased to 6500rpm, even to 7000rpm, the output power of the engine can be improved to above 53.5kw, and the exhaust emission of the engine is also reduced to reach the national fourth standard and the European fourth standard.

Description

A kind of petrol engine

Technical field

The utility model relates to a kind of petrol engine, relates in particular to a kind of petrol engine that is applied on the minicar.

Background technique

Petrol engine is that kinetic energy drives automobile with the Conversion of energy of gasoline, the simplest way is by obtaining kinetic energy in the engine interior burns gasoline, it is usually by connecting rod, and several big members such as distribution device, fuel supply system, lubricating system, cooling system, igniting system and starting system are formed.Wherein, connecting rod is that motor is realized work cycle, finishes the main moving parts of transformation of energy.It is made up of body group, piston rod group and crankshaft-flywheel group etc.In expansion space stroke, piston bears gaseous-pressure moving linearly in cylinder, converts rotatablely moving of bent axle to by connecting rod, and from the external outputting power of bent axle.And in air inlet, compression and exhaust stroke, flywheel releases energy and rotatablely moving of bent axle is changed into the straight line motion of piston.

The function of distribution device is according to the job order of motor and working procedure, and time opening and close intake valve and exhaust valve makes inflammable mixture or air enter cylinder, and waste gas is discharged in cylinder, realizes gas exchange process.Distribution device adopts Overhead valve formula distribution device mostly.

The function of petrol engine fuel supply system is the requirement according to motor, makes the mixed gas of some and concentration, infeeds cylinder, and waste gas after burning is discharged to the atmosphere in cylinder goes;

The function of lubricating system is to carry quantitative cleaning lubricant oil to the part surface of doing relative movement, to realize liquid friction, reduces surface friction drag, alleviates machine members.And part surface cleaned and cool off.Lubricating system is made up of oil leab, oil pump, oil filter and some valves etc. usually.

The function of cooling system is that the part heat that the part that is heated absorbs is in time distributed, and the assurance motor is worked under optimum state of temperature.The cooling system of water cooled engine is made up of cooling jacket, water pump, fan, water tank, thermostat etc. usually.

In petrol engine, the inflammable mixture in the cylinder is that electrical spark is lighted, and on the cylinder head of petrol engine spark plug is housed for this reason, and the spark plug head stretches in the firing chamber.The armamentarium that can on time produce electrical spark between sparking-plug electrode is called igniting system, and igniting system is made up of storage battery, generator, distributor, spark coil and spark plug etc. usually.

Make motor carry out the transition to working state by state of rest, must use the bent axle of external force rolling motor earlier, make piston reciprocates, inflammable mixture burning expansion work done in the cylinder, the promotion piston moves downward and makes crankshaft rotating, motor could turn round voluntarily, and work cycle could be carried out automatically.Therefore, bent axle begins to turn to motor under external force and begins the overall process of idle running automatically, is called the starting of motor.Finish the required device of starting process, be called the starting system of motor.

Above-mentioned petrolic main structure and working principle thereof are summarized, in motor, its core component is a cylinder, at present, the petrolic cylinder bore of 3 cylinders is 68.5mm, discharge capacity is 796mL, maximum speed is 5500r/min, and cylinder body is grey iron casting, such structures shape whole motor volume bigger, weight is heavier, therefore, should not be applied on the minicar, and its rotating speed is difficult to promote once again, power can only be paced up and down about 30kW, and discharging also is difficult to reach requirements at the higher level.

The model utility content

The utility model purpose is to provide in order to overcome the deficiencies in the prior art to improve engine speed, promote engine output and reduce the petrol engine that discharges.

For achieving the above object, the technical solution adopted in the utility model is: a kind of petrol engine, comprise cylinder body, be arranged on the bent axle of cylinder body below, be arranged on a plurality of cylinders that are in line and arrange in the described cylinder body, be arranged on reciprocating piston in described each cylinder, one end and the described piston connecting rod that the other end and described bent axle are hinged that is hinged, be arranged on the cylinder cap of described cylinder body top, described cylinder cap is provided with the firing chamber that is complementary with described number of cylinders, and described each firing chamber has at least two intake valves, at least two exhaust valves and a spark-plug hole are equipped with in the described cylinder with cylinder bore diameter and are closely cooperated mutually and the cylinder sleeve different with described cylinder block material.

Described cylinder block material is an aluminum alloy, and described cylinder jacket material is a grey cast iron.

Described each firing chamber has two intake valves and two exhaust valves, and described spark-plug hole is between two intake valves and two exhaust valves.

Described petrol engine cylinder cap top also is provided with twin cam shaft and adjusts valve timing mechanism, and described twin cam shaft is adjusted valve timing mechanism and is used for the unlatching moment that the intake valve and the exhaust valve of respective combustion chamber are adjusted in continuous variable ground.

Because the utilization of technique scheme, the utility model compared with prior art has following advantage: owing to be provided with cylinder sleeve in the cylinder, and cylinder body adopts two kinds of different materials to make with cylinder sleeve, the material of lightweight replaces as cylinder body being adopted more, to make that then the weight of whole motor is lighter, and make motor compact more; The rotating speed that simultaneously can promote motor is to 6500rpm, even can reach 7000rpm, and the output power of motor can be brought up to more than the 53.5kW, and the exhaust emissions of motor also is reduced, and discharging can reach state IV and Europe IV standard.

Description of drawings

Accompanying drawing 1 is a cylinder body and cylinder sleeve structural representation of the present utility model;

Accompanying drawing 2 is firing chamber of the present utility model four air valve structure schematic representation;

Accompanying drawing 3 is a petrol engine main structure schematic representation of the present utility model;

Wherein: 1, cylinder body; 2, cylinder sleeve; 3, intake valve; 4, spark-plug hole; 5, exhaust valve; 8, firing chamber; 9, bent axle; 10, connecting rod; 11, piston; 20, cylinder; 30, cylinder cap; 40, Double Over Head Camshaft is adjusted valve timing mechanism; 401, belt pulley 401; 402, timing chain; Camshaft 403;

Embodiment

Below in conjunction with accompanying drawing, describe particular content of the present utility model in detail for example:

The petrol engine of present embodiment is a four cylinder engine, shown in Figure 3 is a cylinder structural representation interactional with it, it mainly comprises cylinder 20, be arranged on the piston 11 in the cylinder 20, the connecting rod 10 that one end and piston 11 are hinged mutually, the bent axle 9 that is hinged mutually with described connecting rod 10 two 1 ends, bent axle 9 one ends are connected with flywheel, above cylinder 20, be provided with cylinder cap 30, cylinder cap 30 is formed with firing chamber 8 with the top of cylinder 20, have two intake valves 3 on the firing chamber 8, two exhaust valves 5 and a spark-plug hole 4, and spark-plug hole 4 is between two intake valves 3 and two exhaust valves 5, as shown in Figure 2.As shown in Figure 1, be equipped with in the cylinder 20 and the mutually close-fitting cylinder sleeve 2 of cylinder bore diameter, cylinder sleeve 2 is different with the material of cylinder body 1, cylinder sleeve 2 adopts grey cast iron to make, the heat-resisting quantity and the wear resistance of motor have been guaranteed like this, and cylinder body 1 is made by aluminum alloy material, so just makes that the weight of whole motor is lighter.

Adjust the unlatching moment that valve timing mechanism 40 is adjusted each valve by the camshaft that is arranged on the cylinder cap, as shown in Figure 3, the camshaft 403 that camshaft adjustment structure valve timing 40 mainly comprises belt pulley 401, is arranged on the timing chain 402 on the belt pulley 401 and is connected with described each belt pulley 401 axle center, can change the initial position of camshaft 403 by the change of driving mechanism on the belt pulley 401, thereby according to the unlatching moment of engine behavior needs adjustment inlet and outlet door, to guarantee efficient, the stable operation of motor.

Therefore, of the present utility model have a following advantage:

1, block structure is optimized Fig. 1, reduces cylinder diameter and stroke, thereby reduce engine displacement, dwindled length, the width of motor, reduced the height of motor.Adopt the cylinder body 1 and the Cast iron liner 2 of aluminum alloy, alleviated the weight of motor, accelerate the heat radiation of motor.These will make motor convenient in car load is arranged, have better flexibility.

2, the valve number of firing chamber Fig. 2 is changed into two intake valves 3, two exhaust valves 5, accelerate intake and exhaust speed, strengthen air inflow, realize promoting engine speed, increase the purpose of output power; With spark-plug hole 4 centerings, spark is produced at the mixed gas center, accelerate velocity of combustion, improve combustion efficiency, reduce exhaust gas discharging, realize environmental protection.

3, adopt Double Over Head Camshaft adjustment structural drawing valve timing 3, make inlet and exhaust valve better to regulate according to the motor needs, improve fuel availability, reduce carbon monoxide (CO), hydrocarbon (HC) and nitride discharge of harmful gases such as (NOx).This in addition structure also has significant meaning to improving engine speed.

In conjunction with the accompanying drawings the utility model has been carried out exemplary description above; obviously its specific implementation is not subjected to the restriction of said method; as long as the various transformations of having adopted method design of the present utility model and technological scheme to carry out; or directly apply to other occasion without improvement, all within protection domain of the present utility model.

Claims (4)

1, a kind of petrol engine, comprise cylinder body (1), be arranged on the bent axle (9) of cylinder body (1) below, be arranged on a plurality of cylinders (20) that are in line and arrange in the described cylinder body (1), be arranged on reciprocating piston (11) in described each cylinder (20), one end and described piston (11) connecting rod (10) that the other end and described bent axle (9) are hinged that is hinged, be arranged on the cylinder cap (30) of described cylinder body (1) top, described cylinder cap (30) is provided with the firing chamber (8) that is complementary with described cylinder (20) quantity, and described each firing chamber (8) has at least two intake valves (3), at least two exhaust valves (5) and a spark-plug hole (4) is characterized in that: be equipped with in the described cylinder (20) with cylinder bore diameter and closely cooperate mutually and the cylinder sleeve (2) different with described cylinder body (1) material.

2, petrol engine according to claim 1 is characterized in that: described cylinder body (1) material is an aluminum alloy, and described cylinder sleeve (2) material is a grey cast iron.

3, petrol engine according to claim 1, it is characterized in that: described each firing chamber (8) has two intake valves (3) and two exhaust valves (5), and described spark-plug hole (4) is positioned between two intake valves (3) and two exhaust valves (5).

4, petrol engine according to claim 2, it is characterized in that: described petrol engine cylinder cap top also is provided with twin cam shaft and adjusts valve timing mechanism (40), and described twin cam shaft is adjusted valve timing mechanism (40) and is used for the unlatching moment that the intake valve (3) and the exhaust valve (5) of respective combustion chamber (8) are adjusted in continuous variable ground.

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