CN106050359A

CN106050359A - PCV valve

Info

Publication number: CN106050359A
Application number: CN201610682149.1A
Authority: CN
Inventors: 许涛; 李龙超; 杜鹏; 阮仁宇; 滕建耐; 侯亦波; 张良超; 刘芯娟; 杨冰; 张增光; 张辰; 朱东生
Original assignee: Anhui Jianghuai Automobile Group Corp
Current assignee: Anhui Jianghuai Automobile Group Corp
Priority date: 2016-08-17
Filing date: 2016-08-17
Publication date: 2016-10-26
Anticipated expiration: 2036-08-17
Also published as: CN106050359B

Abstract

The invention relates to the technical field of valves and discloses a PCV valve. The PCV valve comprises a valve seat, a valve core, a spring and a valve tube. A portion, extending into the valve tube and matched with the same, of the valve core comprises a valve core guide section and a valve core non-guide section. The valve core guide section axially extends along the valve core by a preset distance from the end face of one end, extending into the valve tube, of the valve core. A blow-by gap between the valve core and the valve tube is 0.3-0.5mm, and the valve core is provided with an auxiliary blow-by passage. The PCV valve has advantages that friction and abnormal noise caused by lateral deviation of the valve core are eliminated, and blow-by flow control can be effectively guaranteed.

Description

A kind of Pcv valve

Technical field

The present invention relates to valve class technical field, particularly relate to a kind of Pcv valve.

Background technology

When electromotor works, owing to there is certain gap between piston and casing wall, between piston ring and casing wall, therefore Having part combustion mixture to scurry in crankcase, if this part gas blowby is discharged not in time, machine oil will be caused to go bad, oil sealing leaks The problems such as oil.And the key components and parts being responsible for controlling to discharge gas blowby flow is exactly Pcv valve.

With reference to Fig. 1～4, Pcv valve mainly includes valve seat 1', spool 2', spring 3', valve pipe 4', and its effect is according to starting The change of machine operating mode is automatically adjusted the crankcase gas leakage entering cylinder.

Specifically, when the engine is not in operation, spool 2' is pressed on valve seat 1' by spring 3', thus close crankcase with The path of inlet manifold, as shown in Figure 1.

When engine idle or when slowing down, owing to intake manifold vacuum is maximum, spool 2' under the active force of vacuum, Overcoming spring force to be attracted to right-hand member, when the suction equalization of spring force and vacuum, spool 2' stops mobile.Now, Pcv valve Circulation area depends on the gap between the non-guide section of spool 2' and valve pipe, and now between spool 2' and valve pipe 4' Gap is the least, as shown in Figure 2.But during due to idling, crankcase gas leakage is the least, although therefore Pcv valve aperture is the least, also foot So that gas blowby enters inlet manifold.

When engine load raises, the vacuum of inlet manifold reduces, and under spring force, spool 2' is to moving to left Dynamic, the gap between non-guide section and the valve pipe 4' of spool 2' becomes big, as shown in Figure 3.At this moment become big due to the aperture of air throttle, Crankcase gas leakage also increases, and the biggest Pcv valve aperture can make more crankcase gas blowby be inhaled into inlet manifold.

When electromotor is in big load operation, intake manifold vacuum reduces further, and promotion spool 2' is continued by spring 3' Continuing and move to left, now, the circulation area of Pcv valve depends on the gap between the guide section of spool 2' and valve pipe, and now Pcv valve is opened Degree becomes much larger, as shown in Figure 4.Because electromotor will produce more crankcase gas blowby, so only Pcv valve is opened during big load When spending the biggest, crankcase gas blowby just can be made to fully enter inlet manifold.

For ensureing the circulation area of gas blowby, between spool 2' and valve pipe 4', all can there is bigger gap, generally 0.5～ 1mm, it is contemplated that strength problem, spool 2' mostly is metal material, and under gravity, poppet head easily deviates valve pipe Center is downward, causes producing between poppet head and valve pipe friction, thus sends the noise of " giving a tongue-lashing ", affects the comfort level of vehicle With NVH performance.

Summary of the invention

It is an object of the invention to provide a kind of Pcv valve, to eliminate abnormal sound, and can effectively control crankcase gas blowby stream Amount, improves car load comfortableness.

To achieve these goals, the invention provides following technical scheme:

A kind of Pcv valve, including valve seat, spool, spring and valve pipe, described spool stretches into its portion coordinated of described valve Guan Bingyu Dividing and include spool guide section and spool non-guide section, described spool guide section stretches into the end face of described valve pipe one end from described spool Start the axis direction along described spool and extend predeterminable range；Gas blowby gap between described spool and described valve pipe be 0.3～ 0.5mm, described spool is additionally provided with auxiliary blow-by gas passage.

Above-mentioned Pcv valve, described auxiliary blow-by gas passage includes being located on the sidewall of described spool and to the inside of described spool The gas blowby inlet hole extended, also includes the gas blowby venthole connected with described gas blowby inlet hole, and described gas blowby venthole extends to described Spool stretches into the end face of described valve pipe end.

Above-mentioned Pcv valve, described gas blowby inlet hole is arranged along the axis direction being perpendicular to described spool.

Above-mentioned Pcv valve, described gas blowby inlet hole runs through described spool and arranges.

The dead in line of above-mentioned Pcv valve, the centrage that described gas blowby portals and described spool.

Above-mentioned Pcv valve, the flow area that the flow area of described gas blowby inlet hole portals more than described gas blowby.

Above-mentioned Pcv valve, the length of described spool guide section is equal with the length of described spool non-guide section.

Above-mentioned Pcv valve, when middle-low load, the non-guide section of spool coordinates with valve pipe, determines the circulation area of Pcv valve； When high load capacity, the guide section of spool coordinates with valve pipe, determines the circulation area of Pcv valve.

The beneficial effects of the present invention is:

The Pcv valve that the present invention provides, in one end that spool coordinates with valve pipe, has carried out adding bulk processing to the termination of spool, Strengthen the guide effect of spool, it is to avoid bias occurs, eliminates the friction between spool and valve pipe and abnormal sound.Meanwhile, spool Inside is provided with auxiliary blow-by gas passage, compensate for the gas blowby gap between poppet head and valve pipe and diminishes and cause air leak amount not Profit impact, it is ensured that the effective control to air leak amount.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to institute in embodiment Need the accompanying drawing used to be briefly described, and by combining accompanying drawing, the specific embodiment of the present invention is made the most specifically Bright, wherein:

Fig. 1 is existing Pcv valve closed mode figure；

Working state schematic representation when Fig. 2 is existing Pcv valve vehicle idling or deceleration；

Fig. 3 is existing Pcv valve working state schematic representation when vehicle load increases；

Fig. 4 is existing Pcv valve working state schematic representation when the big load of vehicle；

The sectional view of the Pcv valve that Fig. 5 provides for the embodiment of the present invention.

Wherein, the label declaration in above-mentioned accompanying drawing is as follows:

1'-valve seat, 2'-spool, 3'-spring, 4'-valve pipe；

1-valve seat, 2-spool, 3-spring, 4-valve pipe；

21-spool guide section, 22-spool non-guide section, 23-gas blowby air inlet, 24-gas blowby venthole.

Detailed description of the invention

In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with specific embodiment pair This programme is discussed in detail further.

The embodiment of the present invention provide Pcv valve, its structure as it is shown in figure 5, include valve seat 1, spool 2, spring 3 and valve pipe 4, Wherein, described spool 2 stretches into described valve pipe 4 and the part that coordinates with it includes spool guide section 21 and spool non-guide section 22, The length of described spool guide section 21 can arrange equal with the length of described spool non-guide section 22.

The end face that described spool guide section 21 stretches into described valve pipe 4 one end from described spool 2 starts the axle along described spool 2 Line direction extends predeterminable range, and the gas blowby gap between described spool 2 and described valve pipe 4 is 0.3～0.5mm, with prior art Comparing, described spool 2 has carried out adding bulk processing, this enhances the guide effect to spool 2, it is to avoid eccentric, thus eliminates valve Friction between core 2 and valve pipe 4 and abnormal sound.It addition, be additionally provided with auxiliary blow-by gas passage on described spool 2, because described spool 2 adds After Cu, described spool guide section 21, gas blowby gap between described spool non-guide section 22 and described valve pipe 4 all diminish, this meeting Reduce the circulation area of Pcv valve, and then affect the discharge characteristic of Pcv valve so that it is do not mate with engine blow-by gas amount, ultimately result in Crankcase pressure is abnormal, and arranges described auxiliary blow-by gas passage and can make up this deficiency, it is ensured that the effective management to air leak amount.

With reference to Fig. 5, described auxiliary blow-by gas passage includes being located on the sidewall of described spool 2 and to the inside of described spool 2 The gas blowby inlet hole 23 extended, also includes the gas blowby venthole 24 connected with described gas blowby inlet hole 23, and described gas blowby portals 24 extensions The end face of described valve pipe 4 one end is stretched into described spool 2.Crankcase gas blowby is except between described spool 2 and described valve pipe 4 Outside gap is got rid of, also enter described spool 2 from described gas blowby inlet hole 23, and portalled 24 discharges by described gas blowby.

In order to ensure to assist the circulation of blow-by gas passage gas smooth and easy, preferably use following measures, described gas blowby inlet hole 24 edge The axis direction being perpendicular to described spool 2 is arranged；Described gas blowby inlet hole 23 runs through described spool 2 and arranges；Described gas blowby portals 24 The dead in line of centrage and described spool 2；Further, the flow area of described gas blowby inlet hole 23 goes out more than described gas blowby The flow area in hole 24, in a preferred embodiment, the internal diameter of described valve pipe is 6.3mm, spool guide section diameter 5.4mm, the described a diameter of 1.5mm of gas blowby inlet hole, described gas blowby portals 24 a diameter of 1mm.

The structure of the present invention, feature and action effect, above institute are described in detail above according to graphic shown embodiment State only presently preferred embodiments of the present invention, but the present invention is not to limit practical range, every structure according to the present invention shown in drawing Want made change, or be revised as the Equivalent embodiments of equivalent variations, still without departing from description and diagram contained spiritual time, All should be in protection scope of the present invention.

Claims

1. a Pcv valve, including valve seat, spool, spring and valve pipe, described spool stretches into its part coordinated of described valve Guan Bingyu Including spool guide section and spool non-guide section, the end face that described spool guide section stretches into described valve pipe one end from described spool is opened Begin to extend predeterminable range along the axis direction of described spool；It is characterized in that, between the gas blowby between described spool and described valve pipe Gap is 0.3～0.5mm, and described spool is additionally provided with auxiliary blow-by gas passage.

Pcv valve the most according to claim 1, it is characterised in that described auxiliary blow-by gas passage includes being located at described spool The gas blowby inlet hole extended on sidewall and to the inside of described spool, also includes the gas blowby venthole connected with described gas blowby inlet hole, Described gas blowby venthole extends to described spool and stretches into the end face of described valve pipe end.

Pcv valve the most according to claim 2, it is characterised in that described gas blowby inlet hole is along the axis being perpendicular to described spool Direction is arranged.

Pcv valve the most according to claim 3, it is characterised in that described gas blowby inlet hole runs through described spool and arranges.

Pcv valve the most according to claim 4, it is characterised in that the centrage that described gas blowby portals and the axle of described spool Line overlaps.

6. according to the Pcv valve according to any one of Claims 1 to 5, it is characterised in that the flow area of described gas blowby inlet hole is big In the flow area that described gas blowby portals.

7. according to the Pcv valve according to any one of Claims 1 to 5, it is characterised in that the length of described spool guide section and institute The length stating spool non-guide section is equal.

8., according to the Pcv valve according to any one of Claims 1 to 5, it is characterised in that when middle-low load, the non-of spool is led Coordinate with valve pipe to section, determine the circulation area of Pcv valve；When high load capacity, the guide section of spool coordinates with valve pipe, determines PCV The circulation area of valve.