CN210397857U

CN210397857U - Engine PCV valve and positive crankcase ventilation system

Info

Publication number: CN210397857U
Application number: CN201920930436.9U
Authority: CN
Inventors: 侯越; 高正丽; 刘岩
Original assignee: Zhejiang Yili Automobile Parts Co ltd; Zhejiang Geely Holding Group Co Ltd
Current assignee: Zhejiang Yili Automobile Parts Co ltd; Zhejiang Geely Holding Group Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-24
Anticipated expiration: 2029-06-19

Abstract

The utility model provides an engine PCV valve, including valve body and case, the cavity has been seted up to the valve body, the inner wall of valve body is inside sunken to form the spacing groove, the case includes spacing portion, spacing portion with spacing groove cooperation installation is so that the case is rotationally not located the valve body in the cavity, the case can be followed the length direction of cavity removes. Based on this, the utility model discloses still provide a crankcase forced ventilation system, it includes above-mentioned engine PCV valve. The utility model discloses an engine PCV valve and crankcase forced ventilation system sets up the spacing groove structure in engine PCV valve's valve body is inside, and the spacing portion that the design corresponds simultaneously on the case prevents the case at the inside free rotation of valve body for no matter under any kind of operating mode, the case can not the free rotation striking valve body noise.

Description

Engine PCV valve and positive crankcase ventilation system

Technical Field

The utility model relates to an automobile engine field, concretely relates to engine PCV valve and crankcase forced ventilation system.

Background

When the engine works, high-pressure combustible mixed gas and burnt gas in the combustion chamber more or less leak into a crankcase through a gap between the piston group and the cylinder to form blow-by gas, and the components of the blow-by gas comprise unburned fuel gas, water vapor, waste gas and the like. When the blow-by gas is accumulated too much in the crankcase and cannot be discharged in time, the blow-by gas dilutes the engine oil, reduces the service performance of the engine oil, causes premature deterioration of the engine oil to cause premature wear to the engine, and in addition, the blow-by gas also causes the pressure of the crankcase to be too high to damage the sealing of the crankcase, so that the engine oil leaks and runs off. Therefore, crankcase ventilation must be implemented to prevent excessive crankcase pressures, extend engine oil life, reduce wear and corrosion of parts, and prevent engine oil leakage. Modern gasoline engines often employ Positive Crankcase Ventilation (PCV) systems, which are particularly important in the overall PCV system.

The crankcase pressure control system mainly comprises a PCV valve and a ventilation hose, wherein the PCV valve is a metering control valve and is arranged on one side of an air inlet manifold and is arranged between an engine crankcase ventilation system and the air inlet system, and the opening and closing degree of the PCV valve is determined by the vacuum degree of the air inlet manifold, so that the flow of blow-by gas in the crankcase ventilation system entering the air inlet system to participate in combustion is regulated. When the engine is at a normal speed or at a relatively slow rotating speed, the air flow is small, the blow-by gas is small, the opening degree of the PCV valve is small or even closed, and therefore the blow-by gas which is forcibly sucked into the air intake system is relatively little or even none; when the engine is accelerated or the rotation speed is relatively high, the air flow rate is large, the blow-by gas is also large, the PCV opening degree is large, and therefore the blow-by gas which is forcibly sucked into the air intake system is also relatively large. The conventional PCV valve is of a plunger type structure consisting of a valve body, a valve core, a spring and a valve cover, and when the working condition of an engine changes, such as sudden acceleration, sudden deceleration, sudden change of piston air leakage, rapid change of crankcase pressure and the like, the valve core of the PCV valve is influenced by vacuum degree to adjust the working position, the valve core and the valve body are easy to generate relative rotation to knock due to unstable airflow, and further noise is generated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the not enough of prior art, provide an engine PCV valve and crankcase forced ventilation system, carry out redesign to engine PCV valve's valve body, case to realize no matter what kind of change takes place for the engine operating mode, the case can not produce at the inside free rotation of valve body and strike the noise.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

based on the utility model discloses an aspect provides an engine PCV valve, including valve body and case, the cavity has been seted up to the valve body, the inner wall of valve body is inwards sunken to form the spacing groove, the case includes spacing portion, spacing portion with spacing groove cooperation installation is so that the case is rotationally not located the valve body in the cavity, the case can be followed the length direction of cavity removes.

The utility model discloses an engine PCV valve has set up the spacing groove structure in the inside cavity that sets up the case of valve body, and the spacing portion that the design corresponds on the case has prevented the case at the inside free rotation of valve body simultaneously for no matter under engine any kind operating mode, the case can not all be influenced by the air current and freely rotate striking valve body and send out the noise.

In one embodiment, the valve body includes six limiting grooves, the cross section of the cavity is in a hexagonal star shape, the cross section of the limiting portion of the valve element is in a triangular shape, and the cross section of the position of the valve body where the limiting portion is provided is in a hexagonal star shape.

In one embodiment, the cavity comprises an air inlet cavity and an air outlet cavity, and the valve core is arranged in the air inlet cavity.

In one embodiment, the engine PCV valve further includes an elastic member, the elastic member is disposed in the air outlet cavity, and one end of the elastic member abuts against one end of the valve element.

In one embodiment, an air outlet is further formed in the end, provided with the air outlet cavity, of the valve body, the air outlet is communicated with the air outlet cavity, and one end, far away from the valve core, of the elastic part abuts against the inner wall, close to the air inlet end of the air outlet, of the valve body.

In one embodiment, the valve element further comprises a main body part, the limiting part is arranged at one end of the main body part, and the cross sectional area of the main body part is smaller than that of the limiting part.

In one embodiment, the main body portion is cylindrical, and the diameter of the cylindrical main body portion is smaller than that of the air outlet cavity.

In one embodiment, the engine PCV valve further includes an annular oil baffle ring, the oil baffle ring is connected to one end of the valve body to cover the port of the air inlet chamber, and an opening in the oil baffle ring faces the limiting portion of the valve element.

In one embodiment, the inner diameter of the air inlet cavity is larger than the inner diameter of the air outlet cavity.

Based on the utility model discloses a further aspect provides a crankcase forced ventilation system, includes as above the engine PCV valve.

The utility model discloses a positive ventilation system of crankcase, the spacing groove structure has been add in the inside cavity that sets up the case of valve body of its engine PCV valve, adjusts the difficult noise that sends of crankcase ventilation in-process, is favorable to automobile user's the experience of taking.

Other advantages of the present invention will be described in more detail in the detailed description which follows, and in conjunction with the accompanying drawings.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation.

In the drawings:

FIG. 1 is a front view of an embodiment of an engine PCV valve of the present invention without an oil deflector installed;

FIG. 2 is a front view of a valve body of the engine PCV valve of FIG. 1;

FIG. 3 is a cross-sectional view of the engine PCV valve of FIG. 1 without an oil deflector installed;

FIG. 4 is a front view of the engine PCV valve of FIG. 1 with an oil deflector installed;

FIG. 5 is a cross-sectional view of the engine PCV valve of FIG. 1 with an oil deflector installed.

Description of reference numerals: 10. valve body 11, air inlet cavity 13, air outlet cavity 15, limiting groove 17, air outlet 20, valve core 21, limiting part 23, main body part 30, elastic part 40 and oil retaining ring

Detailed Description

To further explain the technical solution of the present invention, the present invention is explained in detail below with reference to the accompanying drawings, in which like reference numerals refer to like parts.

The utility model provides an engine PCV valve, including valve body 10, case 20 and elastic component 30, the cavity has been seted up to valve body 10, and the cavity is including going into air cavity 11 and going out air cavity 13, and the inner wall of the income air cavity 11 of valve body 10 is inside sunken to form spacing groove 15, and case 20 includes spacing portion 21, and case 20 is located into air cavity 11, and spacing portion 21 and spacing groove 15 cooperation installation are so that case 20 does not rotationally locate in the income air cavity 11 of valve body 10, case 20 can follow the length direction who goes into air cavity 11 and remove, and elastic component 30 locates out the air cavity 13 and the one end that the one end of elastic component 30 supported case 20. In this embodiment, the elastic member 30 may be a spring. Specifically, the cavity may extend through the valve body 10.

In the present embodiment, referring to fig. 1 to 3, the valve body 10 includes six limiting grooves 15, the cross section of the air inlet cavity 11 is a hexagonal star shape, the cross section of the limiting portion 21 of the valve core 20 is a triangle, and the cross section of the position of the valve body 10 where the limiting portion 21 is provided is a hexagonal star shape. The engine PCV valve of the embodiment is characterized in that six limiting grooves are formed in the valve body 10, the internal structure of the valve body 10 is changed into an inner hexagonal structure with a hexagonal star-shaped cross section, correspondingly, the limiting part 21 of the valve core 20 is designed into a triangular prism structure with a triangular cross section, and the cross section of the position, provided with the limiting part 21, of the valve core 20 is in the hexagonal star shape, so that when the valve core 20 is installed in the valve body 10, the position, provided with the limiting part 21, of the valve core 20 can be correspondingly clamped into a cavity of the inner hexagonal valve body 10, the valve core 20 is prevented from freely rotating and impacting the inner wall of the valve body 10 in the valve body 10 due to the change of the working condition of the engine, and the rest three limiting grooves of the inner hexagonal valve body 10. It will be appreciated that the cross-section of the cavity and the valve element 20 may have other shapes, such as a polygon, e.g., triangle, quadrilateral, pentagon, etc., or a triangle star, a quadrangle star, a pentagon star, etc., or an ellipse, etc., as long as the valve element 20 is not rotatable relative to the valve body 10.

In the present embodiment, as shown in fig. 3, the valve body 20 further includes a main body portion 23, the stopper portion 21 is provided at one end of the main body portion 23, and the transverse cross-sectional area of the main body portion 23 is smaller than the transverse cross-sectional area of the stopper portion 21. Specifically, the main body portion 23 is cylindrical, and the diameter of the cylindrical main body portion 23 is smaller than that of the gas outlet cavity 13. One end of the cylindrical body portion 23 away from the stopper portion 21 abuts against the elastic member 30.

In this embodiment, the inner diameter of the inlet chamber 11 is larger than the inner diameter of the outlet chamber 13.

In this embodiment, the end of the valve body 10 provided with the air outlet cavity 13 is further provided with an air outlet 17, the air outlet 17 is communicated with the air outlet cavity 13, and the end of the elastic member 30 far away from the valve core 20 abuts against the inner wall of the valve body 10 close to the air inlet end of the air outlet 17.

In the present embodiment, as shown in fig. 4 and 5, the PCV valve of the engine further includes an annular oil deflector 40, the oil deflector 40 is connected to one end of the valve body 10 to cover the port of the air inlet chamber 11, and the opening of the oil deflector 40 faces the limiting portion 21 of the valve element 20. Therefore, when the engine PCV valve is not subjected to vacuum degree regulation of the intake manifold, the engine PCV valve is in a closed state, the oil blocking ring 40 blocks the inlet of the gas passage between the valve body 10 and the valve core 21, oil gas cannot pass through the engine PCV valve, only when the engine PCV valve is subjected to vacuum degree regulation of the intake manifold, the valve core 20 is influenced by the vacuum degree in the intake manifold, the compression spring is moved along the direction of the gas outlet cavity 13, and the oil gas can flow into the gas passage in the inner hexagonal valve body 10 through the opening of the oil blocking ring 40 and sequentially passes through the gas inlet cavity 11, the gas outlet cavity 13 and the gas outlet 17 to pass through the engine PCV valve.

The utility model also provides a crankcase forced ventilation system, include as above engine PCV valve, adopt the valve body to be the novel engine PCV valve of hexagon socket head cap structure, can make and adjust the difficult noise that sends of crankcase ventilation in-process, be favorable to automobile user's the experience of taking.

The utility model provides an engine PCV valve, set up the spacing groove structure in the cavity of placing the valve core in the valve body, design the corresponding spacing portion on the valve core at the same time, prevented the free rotation of the valve core in the valve body, make no matter under any kind of operating mode of engine, the valve core will not be influenced by the air current and freely rotate and strike the valve body and send out the noise; in addition, the valve body structure can be manufactured easily through punch forming.

The above description is only for the specific embodiments of the present invention, and it should be noted that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention.

Claims

1. The PCV valve for the engine is characterized by comprising a valve body (10) and a valve core (20), wherein the valve body (10) is provided with a cavity, the inner wall of the valve body (10) is inwards sunken to form a limiting groove (15), the valve core (20) comprises a limiting part (21), the limiting part (21) is matched with the limiting groove (15) to be installed so that the valve core (20) is non-rotatably arranged in the cavity of the valve body (10), and the valve core (20) can move along the length direction of the cavity.

2. The engine PCV valve according to claim 1, wherein the valve body (10) includes six of the stopper grooves (15), the cross section of the cavity is a hexagonal star shape, the cross section of the stopper portion (21) of the spool (20) is a triangle, and the cross section of the position of the valve body (10) where the stopper portion (21) is provided is a hexagonal star shape.

3. The engine PCV valve according to claim 1, wherein the cavity comprises an air inlet chamber (11) and an air outlet chamber (13), the valve spool (20) being provided in the air inlet chamber (11).

4. The engine PCV valve according to claim 3, further comprising a resilient member (30), wherein the resilient member (30) is disposed in the outlet chamber (13), and wherein one end of the resilient member (30) abuts against one end of the valve element (20).

5. The engine PCV valve according to claim 4, wherein the end of the valve body (10) provided with the air outlet cavity (13) is further provided with an air outlet (17), the air outlet (17) is communicated with the air outlet cavity (13), and the end of the elastic member (30) far away from the valve core (20) abuts against the inner wall of the valve body (10) near the air inlet end of the air outlet (17).

6. The engine PCV valve according to claim 3, wherein the spool (20) further comprises a main body portion (23), the stopper portion (21) is provided at one end of the main body portion (23), and a cross-sectional area of the main body portion (23) is smaller than a cross-sectional area of the stopper portion (21).

7. The engine PCV valve according to claim 6, wherein the main body portion (23) is cylindrical, and wherein the diameter of the cylindrical main body portion (23) is smaller than the diameter of the outlet chamber (13).

8. The engine PCV valve according to claim 3, further comprising an annular oil deflector (40), wherein the oil deflector (40) is connected to one end of the valve body (10) to cover a port of the air inlet chamber (11), and an opening in the oil deflector (40) faces the stopper portion (21) of the valve spool (20).

9. The engine PCV valve according to claim 3, wherein the inner diameter of the air inlet chamber (11) is larger than the inner diameter of the air outlet chamber (13).

10. A crankcase ventilation system comprising an engine PCV valve according to any one of claims 1 to 9.