CN201083151Y - Tent-shaped overhead four-valve gasoline engine combustion chamber - Google Patents

Abstract

A tent-shaped top-mounted four-air valve gasoline engine combustion chamber comprises a piston, a cylinder cover, a spark plug, two inlet valves and two exhaust valves, wherein the lower part of the cylinder cover is dented inwards to form a cavity; the top of the cavity is formed into two oblique planes from the middle to both sides; the two oblique planes are connected by a bulging surface; the two inlet valves and the two exhaust valves are arranged at both sides of the top of the cavity; the walls around the cavity are of a certain height and are formed into an approximate square; the top of the piston is a plane; the cavity, the inlet valves, the lower planes of the exhaust valves and the top plane of the piston are formed into a tent-shaped combustion chamber; the spark plug is arranged on the bulging surface of the top of the cavity, 1.5 mm away from the central line of the combustion chamber towards the exhaust valves; the included angle of the central line of each inlet valve and the central plane of a cylinder is 12 degrees and 2 seconds, while the included angle of the central line of each exhaust valve and the central plane of the cylinder is 11 degrees and 47 seconds. The air valve of the utility model has small included angle, which ensures the compact arrangement of the combustion chamber and improves anti-knock property and compression ratio as well as the power performance and economical efficiency of an entire engine.

Description

Tent shaped overhead four-air valve petrol engine fire chamber

Technical field

The utility model belongs to the combustion chamber of petrol engine field, particularly relates to a kind of tent-shapaed overhead four-air valve petrol engine fire chamber that improves compression ratio, improves complete machine power character and Economy.

Background technique

The combustion-chamber shape of petrol engine generally has following several: many spheries, wedge shape and basin shape.

The spark plug of wedge-section combustion chamber is setovered, because the layout of its spark plug, flame travel is long, so rate of burning is low, heat radiation is many, and the thermal efficiency is low.

The valve diameter of bowl combustion chamber is easily restricted, the intake and exhaust weak effect.

Fig. 1 is a prior art 376QE combustion chamber of petrol engine worm's eye view.As shown in Figure 1, how spherical the chamber structure of TJ376QE motor is, how spherical is formed in the firing chamber by cylinder head circular cavity 50, spark plug 20, intake valve 30, exhaust valve 40.

In petrol engine, TJ376QE petrol engine that discharge capacity is 1 liter uses commonplace, because the motor volume is little, so how spherical the structure of its firing chamber be, shortcoming is the spark plug biasing, the flame distance, and rate of burning is low, and the thermal efficiency is low.Firing chamber area and volume ratio are big, and volumetric efficiency is less.

The angle of the intake valve of TJ376QE petrol engine, exhaust valve center line and cylinder axis face is 23.5 ° in addition, and the valve angle is big, makes combustion chamber placement not compact, and compression ratio can not improve.

Summary of the invention

The utility model provides a kind of flame apart from weak point, thermal efficiency height, tent-shapaed overhead four-air valve petrol engine fire chamber that the valve angle is little for solving the technical problem that exists in the known technology.

The technological scheme that the utility model is taked for the technical problem that exists in the solution known technology is:

The utility model tent-shapaed overhead four-air valve petrol engine fire chamber, comprise: piston, cylinder head, spark plug, intake valve, exhaust valve, the inside recessed formation cavity in its cylinder head bottom, the cavity top forms two plane of inclination by the centre to both sides, and two plane of inclination are connected by crowning; Intake valve, each two of exhaust valves are distributed on two plane of inclination at cavity top; Wall has the certain altitude formation to be roughly square around the cavity; Piston head is the plane; The tent-shapaed firing chamber is formed on the lower plane of cavity and intake valve, exhaust valve and piston head plane.

Spark plug is arranged at the crowning place that two plane of inclination, cavity top join, apart from the position of firing chamber center line deflection exhaust valve 1.5mm.

The angle of intake valve center line and cylinder axis face be 12 ° 2 ', the angle of exhaust valve center line and cylinder axis face be 11 ° 47 '.

Advantage and the good effect that the utlity model has are:

The utility model tent-shapaed overhead four-air valve petrol engine fire chamber, firing chamber are the design of tent shape, are convenient to organize the gas air inlet to roll stream, spark plug can be arranged near the center line of firing chamber, shorten flame travel, so the rate of burning height, heat radiation is few, thermal efficiency height.

Piston head is the plane, can reduce firing chamber area and volume ratio, and volumetric efficiency is bigger, reaches the purpose that reduces HC gas.

In addition, the valve angle is little, makes the combustion chamber placement compactness, has not only made full use of the space, and has improved antiknock quality, can improve compression ratio and reach 10.

Mini engine is improved power character in firing chamber of the present utility model and Economy has played considerable effect.

Description of drawings

Fig. 1 is a prior art 376QE combustion chamber of petrol engine worm's eye view;

Fig. 2 is the utility model tent-shapaed overhead four-air valve petrol engine fire chamber sectional drawing;

Fig. 3 is the utility model tent-shapaed overhead four-air valve petrol engine fire chamber worm's eye view;

Fig. 4 is the utility model tent-shapaed overhead four-air valve petrol engine cylinder head part sectioned view.

Critical piece symbol description in the accompanying drawing:

1: spark plug 2: cylinder head

3: intake valve 4: exhaust valve

5: cavity 6: plane of inclination

7: crowning 8: perisporium

9: piston 10: cylinder

11: measure firing chamber altitude datum face 12: the valve seat mouth

20: spark plug 30: intake valve

40: exhaust valve 50: circular cavity

Embodiment

Followingly the utility model is described in detail with reference to drawings and Examples.

Fig. 2 is the utility model tent-shapaed overhead four-air valve petrol engine fire chamber sectional drawing; Fig. 3 is the utility model tent-shapaed overhead four-air valve petrol engine fire chamber worm's eye view.

As Fig. 2, shown in Figure 3, the utility model tent-shapaed overhead four-air valve petrol engine fire chamber, comprise: piston 9, cylinder head 2, spark plug 1, intake valve 3, exhaust valve 4, the inside recessed formation cavity 5 in its cylinder head bottom, the cavity top forms 6, two plane of inclination, two plane of inclination by the centre to both sides and is connected by crowning 7; Intake valve, each two of exhaust valves are distributed on two plane of inclination at cavity top; Wall 8 has the certain altitude formation to be roughly square around the cavity; Piston head is the plane; The tent-shapaed firing chamber is formed on the lower plane of cavity and intake valve, exhaust valve and piston head plane.

Spark plug is arranged at the crowning place that two plane of inclination, cavity top join, apart from the position of firing chamber center line deflection exhaust valve 1.5mm.

Fig. 4 is the utility model tent-shapaed overhead four-air valve petrol engine cylinder head part sectioned view.As shown in Figure 4, intake valve, exhaust valve are installed in the valve seat mouth 12 of cylinder head, the angle of intake valve center line and cylinder 10 median planes be 12 ° 2 ', the angle of exhaust valve center line and cylinder axis face be 11 ° 47 '.

Symbol 11 is arranged on the measurement firing chamber altitude datum face of firing chamber end face among Fig. 3.

The utility model tent-shapaed overhead four-air valve petrol engine fire chamber is applied on the CA3GA2 type petrol engine.

Claims (1)

1. tent-shapaed overhead four-air valve petrol engine fire chamber, comprise: piston, cylinder head, spark plug, intake valve, exhaust valve, it is characterized in that the inside recessed formation cavity in cylinder head bottom, the cavity top forms two plane of inclination by the centre to both sides, and two plane of inclination are connected by crowning; Intake valve, each two of exhaust valves are distributed on two plane of inclination at cavity top; Wall has the certain altitude formation to be roughly square around the cavity; Piston head is the plane; The tent-shapaed firing chamber is formed on the lower plane of cavity and intake valve, exhaust valve and piston head plane;

Spark plug is arranged at the crowning place at cavity top, apart from the position of firing chamber center line deflection exhaust valve 1.5mm;

The angle of intake valve center line and cylinder axis face be 12 ° 2 ', the angle of exhaust valve center line and cylinder axis face be 11 ° 47 '.

Images