CN1260463C - Gasoline engine valve guide tube - Google Patents

Abstract

The present invention relates to an air valve guide tube for a gasoline engine, which comprises an air inlet valve guide tube and an exhaust valve guide tube. The present invention is characterized in that the air inlet valve guide tube cast iron materials, and the weight percentage contents of the cast iron materials are that C is 3.1 to 3.4%, Si is 1.9 to 2.3%, Mn is 0.6 to 0.9%, S is less than or equal to 0.12%, P is less than or equal to 0.12%, and Fe takes the rest percentage. The exhaust valve guide tube adopts powder metallurgical materials, and the weight percentage contents of the powder metallurgical materials are that C is 0.9 to 2.0%, Cu is 2 to 6%, impurities are less than or equal to 1.0%, and Fe takes the rest percentage. When used, the present invention can effectively enhance the engine reliability and lower the engine failure rate.

Description

A kind of petrol engine valve guide bushing

Technical field

The present invention relates to the distribution device of reciprocating piston type, four stroke engine, particularly a kind of petrol engine valve guide bushing is the improvement of prior art.

Background technique

At present, its structural type and the main performance index of petrol engine such as 491Q type petrol engine, XC4G24 type petrol engine, 495QF-E type petrol engine are respectively:

Sequence number	Project
						1	Cylinder number	Vertical 4 cylinders in upright arrangement	Vertical 4 cylinders in upright arrangement	Vertical 4 cylinders in upright arrangement	Vertical 4 cylinders in upright arrangement
2	Cylinder bore (mm)	91	91	95	95
						3	Piston stroke (mm)	86	86	95	86
4	Total displacement (L)	2.237	2.237	2.693	2.438
						5	Rated power (kW)	70	76	110	90
6	Rated speed	4600	4600	4800	4800
						7	Maximum Torque (N.m)	178	193	235	210
8	The fuel delivery mode	The single-point EFI	Closed loop control, the multipoint fuel bank injection	Closed loop control, the multipoint fuel sequence-injection	Closed loop control, the multipoint fuel sequence-injection
						9	The cylinder liner pattern	Integrated type	Integrated type	Integrated type	Integrated type
10	Compression ratio	8.8	8.8	9.5	9
						11	Valve is arranged	Overhead	Overhead	Overhead	Overhead
12	The camshaft configuration	The underlying single camshaft	The underlying single camshaft	Double Over Head Camshaft	SOHC Single Overhead Camshaft
						13	The tappet pattern	Hydraulic type	Hydraulic type	Mechanical type	Mechanical type
14	Types of combustion chamber	Half wedge shape	Half wedge shape	Wedge shape	Wedge shape

In the prior art, the material that the valve guide bushing of above-mentioned vehicle gasoline engine etc. (intake valve conduit, exhaust valve guide) is adopted has powder metallurgy and two kinds of materials of cast iron, and the selected material of inlet and outlet door is identical, but according to actual production and use condition, the inlet and outlet door is choice of powder metallurgical material or cast iron materials simultaneously, and all the reliability to petrol engine has considerable influence.

Inlet and outlet door conduit is simultaneously during the choice of powder metallurgical material: can satisfy the wear resistance requirement of petrol engine valve guide bushing, but because all there is hole in powdered metallurgical material inside, petrol engine is when the air inlet operating mode, degree of vacuum is bigger in the intake manifold, very easily machine oil is sucked in the firing chamber from hole, thereby cause petrol engine catastrophe failures such as burn oil, cylinder, piston premature wear to occur.

When inlet and outlet door conduit is selected cast iron materials for use simultaneously: can prevent effectively that machine oil is inhaled into the firing chamber, but because cast iron materials inside does not have to store the hole of machine oil, petrol engine is when the exhaust operating mode, the work under bad environment of exhaust valve easily causes exhaust valve, exhaust valve guide catastrophe failures such as heavy wear even ablation to occur owing to insufficient lubrication.

Because the continuous increase of China's expressway is had higher requirement to the reliability of motor.

Summary of the invention

Purpose of the present invention is intended to overcome above-mentioned deficiency of the prior art, by the material of change valve guide bushing, thereby provides a kind of petrol engine valve guide bushing that improves engine reliability, reduces the engine failure rate.

Content of the present invention is: a kind of petrol engine valve guide bushing comprises: intake valve conduit and exhaust valve guide, and its feature part is:

Described intake valve conduit adopts cast iron materials, and the weight percentage of this cast iron materials consists of: C 3.1～3.4%, Si 1.9～2.3%, Mn 0.6～0.9%, S≤0.12%, P≤0.12%, surplus are Fe;

Described exhaust valve guide adopts powdered metallurgical material, and the weight percentage of this powdered metallurgical material consists of: C 0.9～2.0%, Cu 2～6%, surplus are Fe, impurity≤1.0%.

The production and processing technology of the powdered metallurgical material that the cast iron materials that described intake valve conduit adopts, described exhaust valve guide adopt is same as the prior art, slightly.

Compared with prior art, the present invention has following characteristics:

(1) the intake valve conduit adopts cast iron materials: because degree of vacuum is higher in the intake duct, the intake valve conduit adopts cast iron materials can prevent that the machine oil in the valve cage from entering the firing chamber, can prevent catastrophe failures such as cylinder premature wear, piston ring that motor causes because of burn oil be stuck effectively; Simultaneously, because intake duct, intake valve temperature are lower, working environment is better relatively, and is less demanding to lubricating condition, and the residual machine oil of engine valve stem can guarantee proper lubrication fully, has improved the reliability of motor effectively;

(2) exhaust valve guide adopts powdered metallurgical material: owing to air outlet flue, exhaust valve operating temperature height, work under bad environment, lubricating condition is had relatively high expectations, and exhaust valve guide adopts powdered metallurgical material can guarantee proper lubrication, anti-air-stop gate, valve guide bushing premature wear fault; Simultaneously, degree of vacuum is very low in the air outlet flue, and motor can not be inhaled into the firing chamber because of the machine oil in the valve cage and cause starting machine burning machine fault;

(3) take the present invention, by 400 model machines that adopt the new material manufacturing are compared test with 400 model machines that adopt old made, improving front engine burn oil rate of fault is 11%, improve rear engine burn oil fault and leveled off to zero, simultaneously, the motor after improving 150 hours stand reliability trials and 16000 kilometers road reliability trials have been carried out, all no abnormal wearing and tearing of valve, valve guide bushing, reach the raising engine reliability, reduced engine failure rate purpose;

(4) take optimized technical scheme of the present invention, solved long-term unsolved problem, obtained unforeseeable technique effect, have obvious improvement, and practical.

Description of drawings

Fig. 1 is a part intake valve assembly structural representation in the embodiment of the invention;

Fig. 2 is a part exhaust valve assemblies structural representation in the embodiment of the invention.

Among the figure: 1-intake valve, 2-intake valve conduit, 3-cylinder head, 4-intake duct, 5-exhaust valve, 6-exhaust valve guide, 7-air outlet flue.

Embodiment

Embodiment 1-4:

Referring to each accompanying drawing.A kind of petrol engine valve guide bushing comprises: intake valve conduit and exhaust valve guide;

Described intake valve conduit 2 adopts cast iron materials, and the weight percentage composition of this cast iron materials sees the following form:

Embodiment numbers weight % component	1	2	3	4
					C	3.1	3.2	3.3	3.4
Si	1.9	2.0	2.1	2.3
					Mn	0.6	0.7	0.8	0.9
Fe	Surplus	Surplus	Surplus	Surplus
					S	≤0.12	≤0.12	≤0.12	≤0.12
P	≤0.12	≤0.12	≤0.12	≤0.12

Described exhaust valve guide 6 adopts powdered metallurgical material, and the weight percentage composition of this powdered metallurgical material sees the following form:

Embodiment numbers weight % component	1	2	3	4
					C	0.9	0.9	2.0	2.0
Cu	2	3.5	4.5	6
					Fe	Surplus	Surplus	Surplus	Surplus
Impurity	≤1.0	≤1.0	≤1.0	≤1.0

The production and processing technology of the powdered metallurgical material that the cast iron materials that described intake valve conduit adopts, described exhaust valve guide adopt is same as the prior art, slightly.

The foregoing description is used for petrol engine such as 491Q Series Gasoline Engines, 4G24 Series Gasoline Engines, 495QF-E type petrol engine, can effectively improve petrolic reliability, reduce rate of fault.

The invention is not restricted to the foregoing description, content of the present invention is described all can implement and have described good result.

Claims (1)

1, a kind of petrol engine valve guide bushing, comprising: intake valve conduit and exhaust valve guide is characterized in that:

Described intake valve conduit adopts cast iron materials, and the weight percentage of this cast iron materials consists of: C 3.1～3.4%, Si 1.9～2.3%, Mn 0.6～0.9%, S≤0.12%, P≤0.12%, surplus are Fe;

Described exhaust valve guide adopts powdered metallurgical material, and the weight percentage of this powdered metallurgical material consists of: C 0.9～2.0%, Cu 2～6%, surplus are Fe, impurity≤1.0%.

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