CN108894843A - A kind of valve structure-improved - Google Patents

Abstract

A kind of valve structure-improved, it is characterized in that the air intake valve of cylinder head and at least one of periphery of drain tap is made to be recessed with protrusion, and protrusion correspond to the valve guide of cylinder head and between valve guide between be separated with a gap.It is an advantage of the invention that, contact area between valve and valve guide can be reduced, so that the pyroconductivity between valve and valve guide is substantially reduced, it can be in the case where not influencing cylinder head intake and exhaust efficiency, making the heat of valve can transmit toward top, increase the thermal expansion amount of valve axial direction, can avoid cylinder head and generate to tap abnormal sound, and can avoid the cam in cylinder head and be hit load and tired problem occurs.Furthermore make also reduce cost, and may conform to environmental requirement under a simple structure change in valve.

Description

A kind of valve structure-improved

Technical field

The present invention relates to a kind of valve structure-improved, espespecially a kind of valve structure-improved suitable in engine cylinder head.

Background technique

For general vehicle engine structure, cylinder head will include an air intake duct, an exhaust duct and a burning Room, and wherein air intake duct and exhaust duct are respectively communicated with combustion chamber.

In addition, said cylinder head can offer air intake valve channel and drain tap channel, quantity then regards this cylinder head Depending on cylinder head for several valves, and in can be installed with respectively in air intake valve conduit and drain tap conduit air intake valve with Drain tap.The top of above-mentioned air intake valve and drain tap is rocker arm chamber, and the indoor cam contact of rocker arm is in air intake valve With the top of drain tap, and the bottom of air intake valve and drain tap is then valve position.When engine is when actuation, cylinder head Temperature can increase, make air intake valve and drain tap after valve position is heated, heat can by valve position and in into Top is transferred on air valve and drain tap.

However, because air intake valve and drain tap can respectively with institute's difference in air intake valve channel and drain tap channel The inlet and outlet valve guide that group is set is in contact, therefore the heat on air intake valve and drain tap can radially be transferred to inlet and outlet Valve guide, so that not at all easy heat loss for being transferred to air intake valve and drain tap, causes air intake valve and exhaust valve The axial-temperature gradient (axial heat transfer) of door declines rapidly.

Therefore, when heat is transmitted from the valve position of air intake valve and drain tap toward top, it may occur that heat is a large amount of Lost problem will so will cause cylinder head valve clearance and generate change, opposite that cylinder head can be made to generate percussion abnormal sound, simultaneously It causes the cam in cylinder head to be hit load and the problem of fatigue occurs.Although the settling mode of early stage is to change cylinder head Interior cam contour, such as buffer area appropriate is reserved, to slow down the impact of cam, but the design of this buffer area, but can Reduce the opening area and closing time of cylinder head valve, the intake and exhaust efficiency of relative effect engine.Or early stage Zeng You factory Quotient in being arranged mercury in the valve bar portion of cylinder head, attempt transferred heat to using the high thermal conductivity degree of mercury air intake valve with The top of drain tap, however, how mercury is arranged in the valve position of cylinder head is a troubling problem, and so Design also results in increased costs, does not meet the appearance of the problems such as environmental requirement, not very ideal.

Summary of the invention

The object of the present invention is to provide a kind of valve structure-improveds, and valve is made to make a simple structure change.

The object of the present invention is achieved like this, and valve structure-improved is mounted in a cylinder head, and this cylinder head includes There are an air intake duct, an exhaust duct and a combustion chamber, and air intake duct and exhaust duct are respectively communicated to combustion chamber.

In addition, said cylinder head is interior and offers an at least air intake valve channel and an at least drain tap channel, In, an at least air intake valve channel is connected to air intake duct, and an at least drain tap channel is connected to exhaust duct, and an at least air intake valve At least one of channel and an at least drain tap channel include a valve guide.

Above-mentioned valve structure-improved includes an at least air intake valve and an at least drain tap.Wherein, at least one into Air valve is located in at least air intake valve channel in cylinder head and extends to air intake duct and relative to an at least intake valve Door moves up and down.Likewise, an at least drain tap is located in at least drain tap channel in cylinder head and prolongs It extends to exhaust duct and is moved up and down relative to an at least drain tap channel.

Characteristic of the invention is at least one of outer of an above-mentioned at least air intake valve and an at least drain tap Be recessed in week at least one protrusion, and it is above-mentioned at least one protrusion correspond to valve guide and between valve guide between be separated between one Gap.

By above structure, the contact area between valve and valve guide can be reduced, so that valve and valve Pyroconductivity between conduit can substantially reduce, and the opposite heat for making valve can be transmitted toward top, increase valve axial direction Thermal expansion amount so can be avoided cylinder head from generating and tap abnormal sound, and is same in not influencing under the intake and exhaust efficiency of cylinder head and engine When avoid the cam in cylinder head from being hit load and the problem of fatigue occur.

Furthermore since above structure only need to be in one simple structure change of work on valve, therefore being designed in this way can be reduced into This, and the requirement of environmental protection can be met.

An above-mentioned at least protrusion may include having an at least raised line or may include having an at least salient point.It is designed in structure On, because of the design of protrusion, it is opposite can reeded generations (for protrusion), therefore can also say be an at least air intake valve with At least one of periphery concave-convex surface of an at least drain tap.

The quantity of above-mentioned at least one protrusion can be a plurality of, and can angularly be convexly equipped in an at least air intake valve and at least one At least one of periphery of drain tap.

It is an advantage of the invention that in the case where not influencing cylinder head intake and exhaust efficiency, can make the heat of valve can transmit toward top, Increase the thermal expansion amount of valve axial direction, thereby can avoid cylinder head and generate to tap abnormal sound, and the cam in avoidable cylinder head by Impact load and occur fatigue problem.Furthermore make also reduce cost, and can accord under a simple structure change in valve Cyclization guaranteed request.

Detailed description of the invention

Fig. 1 is the side view of the cylinder head of a preferred embodiment of the present invention.

Fig. 2 is the cross-sectional view of the valve of a preferred embodiment of the present invention.

Main element symbol description：13 air intake valve channel of cylinder head 1 air intake duct, 11 exhaust duct, 12 combustion chamber, 14 row Raised 31 valve guides 32 of 22 drain tap of raised 21 valve guide of 15 air intake valve of air valve door 23

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Please refer to Fig. 1 be the side view of the cylinder head of a preferred embodiment of the present invention and Fig. 2 is that the present invention one is preferable The cross-sectional view of the valve of embodiment, and group is equipped with a valve structure-improved of the invention in the cylinder head 1 in schema.It is above-mentioned Cylinder head 1 uses one or four stroke cylinder heads in this present embodiment, and the structure of air inlet or exhaust is identical, therefore following only to scheme Visual angle in formula is illustrated.Cylinder head 1 in schema includes an air intake duct 11, an exhaust duct 12 and a combustion chamber 13, And air intake duct 11 therein is respectively communicated to combustion chamber 13 with exhaust duct 12.In addition, offered in cylinder head 1 in schema one into Air valve door 14 and a drain tap channel 15, and air intake valve channel 14 therein is connection air intake duct 11, exhaust valve Door 15 is connected to exhaust duct 12, and air intake valve channel 14 and drain tap channel 15 are equipped with a valve guide respectively 22,32, it can be described as air intake valve conduit in the valve guide 22 in air intake valve channel 14, the valve in drain tap channel 15 Door conduit 32 can be described as drain tap conduit.Above-mentioned 14 content of air intake valve channel is equipped with an air intake valve 2, this air intake valve 2 And it extends to air intake duct 11 and is moved up and down relative to air intake valve channel 14；Likewise, 15 content of drain tap channel is equipped with One drain tap 3, this drain tap 3 simultaneously extend to exhaust duct 12 and move up and down relative to drain tap channel 15.In addition, It is recessed with a plurality of raised 21,31, and this plurality of raised 21,31 difference respectively in the periphery of air intake valve 2 and drain tap 3 Corresponding to the valve guide 22,32 accommodated respectively in air intake valve channel 14 and drain tap channel 15 and respectively with valve A clearance t is separated between conduit 22,32.

In this present embodiment, a plurality of raised 21,31 be respectively a raised lines, and this plurality of raised 21,31 angularly divide Every the ground recessed periphery in air intake valve 2 and drain tap 3 respectively.

Therefore, by above structure, air intake valve 2 and drain tap 3 respectively with 22,32 (inlet and outlet valve of valve guide Conduit) between contact area can reduce so that air intake valve 2 and drain tap 3 are respectively between valve guide 22,32 Pyroconductivity can substantially reduce, and the opposite heat made on air intake valve 2 and drain tap 3 can be passed successfully toward top respectively Pass, therefore increase air intake valve 2 and the axial thermal expansion amount of drain tap 3, so can in do not influence cylinder head and engine into Under exhaust efficiency, avoids cylinder head from generating and tap abnormal sound, and the cam in cylinder head is avoided to be hit load and occur tired simultaneously The problem of labor.

Furthermore since above structure only need to be in making a simple structure change, therefore such as on air intake valve 2 and drain tap 3 This design can reduce cost, and can meet the requirement of environmental protection.

Difference in height by actual experiment, protrusion 21,31 is preferably designed to be 0.050mm~0.075mm, and aforementioned The amount of difference in height is extremely small, therefore the influence amplitude of the axial heat transfer sectional area for air intake valve 2 and drain tap 3, only Between -4%~-6%, that is, its influence degree can be not significant, but the difference in height of protrusion 21,31 is not with aforementioned digital model It encloses and is limited.

Though in addition, in this present embodiment, being all convexly equipped with respectively in the periphery of air intake valve 2 and drain tap 3 a plurality of convex Play 21,31, but in at least one of periphery of air intake valve 2 and drain tap 3 be convexly equipped with protrusion 21,31 also can, and it is convex 21,31 are played also may be used at least one.

Certainly, the sectional area shape of protrusion 21,31 can be varied, such as triangle, trapezoidal, semicircle etc., and protrusion 21,31 in addition to being designed to raised line, also may be designed to the raised line etc. of salient point or segmented.

It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (3)

1. a kind of valve structure-improved, is mounted in a cylinder head, which includes an air intake duct, an exhaust duct and a combustion Burn room, the air intake duct and the exhaust duct are respectively communicated to combustion chamber, in cylinder head and offer an at least air intake valve channel and An at least drain tap channel, at least an air intake valve channel is connected to the air intake duct for this, at least drain tap channel connection The exhaust duct, and at least one of an at least air intake valve channel and an at least drain tap channel include a valve Conduit；Wherein, which includes：An at least air intake valve is located in an at least air intake valve channel and prolongs It extends to the air intake duct and at least an air intake valve channel moves up and down relative to this；And an at least drain tap, it is located in this In an at least drain tap channel and extend to the exhaust duct and at least a drain tap channel moves up and down relative to this；Its It is characterized in that：It is convex that at least one of periphery of an at least air intake valve and an at least drain tap is recessed at least one Rise, and this at least one protrusion correspond to the valve guide and between the valve guide between be separated with a gap.

2. valve structure-improved as described in claim 1, it is characterised in that at least one protrusion includes an at least raised line.

3. valve structure-improved as described in claim 1, it is characterised in that the quantity of at least one protrusion is a plurality of, and is waited Angle is convexly equipped in at least one of periphery of an at least air intake valve and an at least drain tap.