PCV valve, engine and vehicle

Abstract

The utility model provides a PCV valve, an engine and a vehicle, and the PCV valve comprises a valve body which is provided with an air inlet, a containing cavity and an air outlet which are sequentially communicated; the plunger assembly is arranged in the containing cavity and comprises a plunger body and a sealing plug, the sealing plug is arranged at the end, close to the air inlet, of the plunger body, the sealing plug is a flexible piece and comprises a main body part and a protruding part which are connected, and the protruding part is arranged on the side, away from the plunger body, of the main body part in a protruding mode; the outer diameter of the main body part is larger than that of the protruding part, and the shape and the size of the protruding part are matched with the shape and the size of the air inlet respectively. Through the arrangement, the sealing plug is used for absorbing vibration, so that collision noise generated by the PCV valve when the plunger body is seated is effectively reduced; the shape and the size of the protruding part are matched with the shape and the size of the air inlet, so that the protruding part can be tightly inserted into the air inlet, and the sealing performance of the PCV valve is improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a PCV valve, an engine and a vehicle. Background Art

[0002] The PCV valve (Positive Crankcase Ventilation Valve) is an important component in a car engine. The function of the PCV valve is to discharge the blowby gas in the crankcase to prevent the blowby gas from accumulating in the crankcase, thereby ensuring the normal operation of the engine.

[0003] In recent years, the automobile industry has developed rapidly. As the heart of the car, the performance of the engine has also attracted much attention. People require the engine to have a higher load, and the high load will inevitably lead to increased blowby in the crankcase. The PCV valve needs to have better sealing to ensure its own working accuracy; among them, the increase in blowby causes the PCV valve to open and close frequently and the plunger to sit frequently, resulting in a loud impact sound, causing the engine NVH performance to deteriorate.

[0004] Therefore, how to improve the sealing performance of the PCV valve while reducing the impact noise of the PCV valve has become an urgent problem to be solved. Utility Model Content

[0005] In view of this, the present application provides a PCV valve, an engine, and a vehicle, which can improve the sealing performance of the PCV valve while reducing the impact noise of the PCV valve.

[0006] Specifically, the following technical solutions are included:

[0007] In a first aspect, an embodiment of the present application provides a PCV valve, comprising:

[0008] The valve body is provided with an air inlet, a receiving cavity and an air outlet which are connected in sequence;

[0009] A plunger assembly is arranged in the accommodating cavity, and the plunger assembly includes a plunger body and a sealing plug. The sealing plug is arranged at one end of the plunger body close to the air inlet. The sealing plug is a flexible member, and the sealing plug includes a connected main body and a protruding portion. The protruding portion is protruding on the side of the main body away from the plunger body, and the outer diameter of the main body is larger than the outer diameter of the protruding portion. The shape and size of the protruding portion are respectively adapted to the shape and size of the air inlet.

[0010] In an optional embodiment, a first rounded corner structure is arranged between the side wall of the air inlet and the end wall of the accommodating cavity, and the first rounded corner structure is in the shape of an arc surface.

[0011] In an optional embodiment, a second rounded corner structure is arranged between the protruding portion and the main body portion, the second rounded corner structure is in an arc shape, and the shape and size of the second rounded corner structure are respectively matched with the shape and size of the first rounded corner structure.

[0012] In an optional embodiment, the PCV valve further includes a first spring, wherein the first spring is sleeved on the outside of the plunger body;

[0013] The accommodating cavity includes a first cavity and a second cavity, the first cavity is connected to the air inlet, the second cavity is connected to the exhaust port, the inner diameter of the first cavity is larger than the inner diameter of the second cavity, so as to form a first step surface between the first cavity and the second cavity, and the first step surface is used to abut against the first spring.

[0014] In an optional embodiment, the PCV valve further includes a valve seat, which is annular and disposed on a side wall of the second cavity, and is used for the plunger body to pass through the valve seat.

[0015] In an optional embodiment, the plunger assembly also includes a plunger tail, which is arranged at an end of the plunger body away from the sealing plug, and the outer diameter of the plunger tail is smaller than the outer diameter of the plunger body, and the outer diameter of the plunger tail is smaller than the inner diameter of the exhaust port.

[0016] In an optional embodiment, the PCV valve further includes a second spring, wherein the second spring is sleeved on the outside of the plunger tail;

[0017] The inner diameter of the second cavity is greater than the inner diameter of the exhaust port, so as to form a second step surface between the second cavity and the exhaust port, and the second step surface is used to abut against the second spring.

[0018] In an optional embodiment, the PCV valve further includes a flexible sleeve, wherein the flexible sleeve covers an outer wall of the valve body.

[0019] In a second aspect, an embodiment of the present application provides an engine, comprising a PCV valve provided by any embodiment of the first aspect.

[0020] In a third aspect, an embodiment of the present application provides a vehicle, comprising the engine provided by the embodiment of the second aspect.

[0021] The beneficial effects of the technical solution provided in the embodiment of the present application include at least: by setting the sealing plug as a flexible part, the sealing plug is used to absorb vibration, and the collision between the plunger body and the inner wall of the valve body is reduced, so that the collision noise generated by the PCV valve when the plunger body is seated is effectively reduced, which helps to improve the NVH performance of the engine; by setting the sealing plug to include a main body and a protruding part, and the shape and size of the protruding part are respectively matched with the shape and size of the air inlet, so that the protruding part can be tightly inserted into the air inlet, thereby increasing the sealing area of ​​the sealing plug and the air inlet, and improving the sealing performance of the PCV valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 One of the structural schematic diagrams of the PCV valve provided in the embodiment of the present application;

[0024] Figure 2 The second structural schematic diagram of the PCV valve provided in the embodiment of the present application;

[0025] Figure 3 This is the third structural schematic diagram of the PCV valve provided in the embodiment of the present application.

[0026] The reference numerals in the figures represent respectively:

[0027] 1-valve body; 11-air inlet; 12-accommodating chamber; 121-first chamber; 122-second chamber; 123-first step surface; 124-second step surface; 13-exhaust port;

[0028] 21- plunger body; 22- sealing plug; 221- main body; 222- raised part; 23- plunger tail; 24- boss;

[0029] 3-first rounded corner structure; 4-second rounded corner structure; 5-first spring; 6-valve seat; 7-second spring; 8-flexible sleeve.

[0030] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0033] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as those generally understood by those of ordinary skill in the art. Some technical terms appearing in the embodiments of the present application are explained below.

[0034] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 3 As shown, an embodiment of the present application provides a PCV valve, including a valve body 1 and a plunger assembly. Exemplarily, the PCV valve is made of plastic material.

[0036] The valve body 1 is provided with an air inlet 11, a receiving cavity 12 and an air outlet 13 which are connected in sequence. Figure 1 As shown, the inside of the valve body 1 is composed of an air inlet 11, a receiving chamber 12 and an exhaust port 13 from left to right, wherein the air inlet 11 is used to communicate with the crankcase, and the exhaust port 13 is used to communicate with the intake pipe of the engine.

[0037] The plunger assembly is arranged in the accommodating cavity 12, and the plunger assembly includes a plunger body 21 and a sealing plug 22. The sealing plug 22 is arranged at one end of the plunger body 21 close to the air inlet 11. The sealing plug 22 is a flexible member. The sealing plug 22 includes a connected main body 221 and a protrusion 222. The protrusion 222 is protruded on the side of the main body 221 away from the plunger body 21, and the outer diameter of the main body 221 is larger than the outer diameter of the protrusion 222. The shape and size of the protrusion 222 are respectively adapted to the shape and size of the air inlet 11.

[0038] Specifically, the vacuum degree of the engine's intake pipe determines the opening and closing and the degree of opening of the PCV valve. Under the action of the air pressure difference, the plunger assembly moves along the length direction of the plunger body 21, thereby opening or closing the PCV valve.

[0039] Exemplarily, the sealing plug 22 is made of rubber, silicone or other materials. The sealing plug 22 has elastic deformation capability, can absorb vibration, and reduce the collision between the plunger body 21 and the inner wall of the valve body 1, so that the collision noise generated by the PCV valve when the plunger body 21 is seated is effectively reduced.

[0040] like Figure 1 As shown, the plunger body 21 extends in the horizontal direction, and the sealing plug 22 is located at the left end of the plunger body 21. Exemplarily, the plunger body 21 is roughly cylindrical, and the end of the plunger body 21 close to the air inlet 11 has a boss 24, the outer diameter of the boss 24 is larger than the outer diameter of the plunger body 21, and the sealing plug 22 is sleeved on the outer side of the boss 24, and the outer diameter of the main body 221 is larger than the outer diameter of the plunger body 21 and the outer diameter of the protrusion 222.

[0041] Exemplarily, the inner diameter of the accommodating chamber 12 is slightly larger than the outer diameter of the main body 221 , so that a gap is formed between the main body 221 and the valve body 1 for the blow-by gas to flow and be discharged.

[0042] The shape of the protrusion 222 is adapted to the shape of the air inlet 11, which means that the shape of the protrusion 222 is the same as the shape of the air inlet 11, for example, the cross-sectional profile shape of the protrusion 222 and the cross-sectional profile shape of the air inlet 11 are both circular.

[0043] The size of the protrusion 222 is adapted to the size of the air inlet 11, which means that the cross-sectional perimeter of the air inlet 11 is equal to or slightly larger than the cross-sectional perimeter of the protrusion 222, so that the protrusion 222 can be just inserted into the air inlet 11 for sealing.

[0044] By providing the raised portion 222, the sealing area between the sealing plug 22 and the air intake port 11 is increased, thereby improving the sealing performance of the PCV valve. On the one hand, under the low-load condition of the engine, the amount of blowby gas in the crankcase entering the air intake port 11 is reduced, thereby reducing the amount of blowby gas discharged by the PCV valve, which is beneficial to reducing pollution to the atmosphere; on the other hand, the vacuum degree of the exhaust port 13 increases after the blowby gas is discharged, and the sealing performance of the air intake port 11 is improved. Therefore, the pressure difference between the air intake port 11 and the exhaust port 13 will be more obvious, thereby improving the sensitivity and working accuracy of the PCV valve and ensuring the working effect of the PCV valve.

[0045] Exemplarily, when the protrusion 222 is inserted into the air inlet 11 , a surface of the main body 221 facing away from the plunger body 21 abuts against an inner wall of the valve body 1 , further increasing the sealing area.

[0046] Exemplarily, the inner wall of the valve body 1 is provided with a guide rail structure, and the sealing plug 22 is cooperatively connected with the guide rail structure to drive the plunger body 21 to move along its own length direction.

[0047] The PCV valve provided in the embodiment of the present application, by setting the sealing plug 22 as a flexible part, uses the sealing plug 22 to absorb vibration, reduces the collision between the plunger body 21 and the inner wall of the valve body 1, so that the collision noise generated by the PCV valve when the plunger body 21 is seated is effectively reduced, which helps to improve the NVH performance of the engine; by setting the sealing plug 22 to include a main body 221 and a protrusion 222, and the shape and size of the protrusion 222 are respectively matched with the shape and size of the air inlet 11, the protrusion 222 can be tightly inserted into the air inlet 11, thereby increasing the sealing area of ​​the sealing plug 22 and the air inlet 11, and improving the sealing performance of the PCV valve.

[0048] In a further embodiment, a first rounded structure 3 is provided between the side wall of the air inlet 11 and the end wall of the accommodating chamber 12, and the first rounded structure 3 is in the shape of an arc surface. It can be understood that the end wall of the accommodating chamber 12 is the accommodating chamber 12 at the Figure 1 The inner walls at the left and right ends are arranged opposite to each other.

[0049] Specifically, the first rounded structure 3 is formed by rounding the corners between the air inlet 11 and the accommodating cavity 12 .

[0050] The first fillet structure 3 is provided, which is not only helpful to reduce stress concentration, but also can avoid collision between the protrusion 222 and the inner wall of the valve body 1 during the process of inserting the protrusion 222 into the air inlet 11, which is helpful to increase the service life of the PCV valve.

[0051] In a further embodiment, a second rounded structure 4 is disposed between the protrusion 222 and the main body 221 . The second rounded structure 4 is in an arc shape, and the shape and size of the second rounded structure 4 are respectively adapted to the shape and size of the first rounded structure 3 .

[0052] like Figure 2 As shown, by providing a second rounded structure 4 between the protruding portion 222 and the main body 221 , a smooth transition is achieved between the protruding portion 222 and the main body 221 .

[0053] The shape of the second rounded corner structure 4 is adapted to the shape of the first rounded corner structure 3, which means that the shape of the second rounded corner structure 4 is the same as the shape of the first rounded corner structure 3; the size of the second rounded corner structure 4 is adapted to the size of the first rounded corner structure 3, which means that the area of ​​the second rounded corner structure 4 is equal to the area of ​​the first rounded corner structure 3.

[0054] By setting the shape and size of the second rounded structure 4 to match the shape and size of the first rounded structure 3 respectively, the second rounded structure 4 can fully fit with the first rounded structure 3, thereby increasing the contact area between the sealing plug 22 and the inner wall of the valve body 1 when the protrusion 222 is inserted into the air inlet 11, reducing the gap between the sealing plug 22 and the inner wall of the valve body 1, and improving the sealing effect of the PCV valve.

[0055] In a further embodiment, the PCV valve further includes a first spring 5, which is sleeved on the outer side of the plunger body 21. The accommodating chamber 12 includes a first cavity 121 and a second cavity 122, wherein the first cavity 121 is connected to the air inlet 11, and the second cavity 122 is connected to the exhaust port 13, and the inner diameter of the first cavity 121 is greater than the inner diameter of the second cavity 122, so as to form a first step surface 123 between the first cavity 121 and the second cavity 122, and the first step surface 123 is used to abut against the first spring 5.

[0056] like Figure 1 As shown, the left end of the first spring 5 is connected to the boss 24. The outer diameter of the first spring 5 is greater than the inner diameter of the second cavity 122, so that the first spring 5 can abut against the first step surface 123.

[0057] By providing the first spring 5, the elastic force of the first spring 5 is utilized to enhance the vibration isolation capability of the PCV valve, which is helpful to reduce the impact noise; and the abutment between the first spring 5 and the first step surface 123 helps the PCV valve to reset from the open state to the closed state.

[0058] In a further embodiment, the PCV valve further includes a valve seat 6 , which is annular and disposed on the side wall of the second cavity 122 , and the valve seat 6 is used for the plunger body 21 to pass through.

[0059] like Figure 1 As shown, the valve seat 6 is arranged on the side of the second cavity 122 close to the first cavity 121, and the inner ring diameter of the valve seat 6 is equal to or slightly larger than the outer diameter of the plunger body 21, so that the plunger body 21 can pass through the valve seat 6 while ensuring the sealing performance of the plunger body 21 when passing through the valve seat 6, so that it is difficult for blow-by gas to enter the second cavity 122 from the first cavity 121, thereby preventing blow-by gas from being discharged from the exhaust port 13. Figure 3 As shown, the plunger assembly moves to the right and the plunger body 21 is inserted into the valve seat 6 . At this time, the blow-by gas can enter the first cavity 121 from the air inlet 11 , but cannot enter the second cavity 122 from the first cavity 121 .

[0060] In a further embodiment, the plunger assembly also includes a plunger tail 23, which is arranged at an end of the plunger body 21 away from the sealing plug 22, and the outer diameter of the plunger tail 23 is smaller than the outer diameter of the plunger body 21, and the outer diameter of the plunger tail 23 is smaller than the inner diameter of the exhaust port 13.

[0061] like Figure 1 As shown, the plunger tail 23 is connected to the right end of the plunger body 21. By setting the outer diameter of the plunger tail 23 smaller than the inner diameter of the exhaust port 13, the exhaust port 13 can accommodate the plunger tail 23, thereby preventing the plunger tail 23 from being squeezed or collided with the exhaust port 13.

[0062] In a further embodiment, the PCV valve further includes a second spring 7, which is sleeved on the outside of the plunger tail 23. The inner diameter of the second cavity 122 is larger than the inner diameter of the exhaust port 13, so as to form a second step surface 124 between the second cavity 122 and the exhaust port 13, and the second step surface 124 is used to abut against the second spring 7.

[0063] like Figure 1 As shown, the second spring 7 is connected to the right end surface of the plunger body 21. The outer diameter of the second spring 7 is greater than the inner diameter of the exhaust port 13, so that the second spring 7 can abut against the second step surface 124.

[0064] By providing the second spring 7, the elastic force of the second spring 7 is utilized to further enhance the vibration isolation capability of the PCV valve, which is beneficial to reducing the impact noise.

[0065] In a further embodiment, the PCV valve further includes a flexible sleeve 8 , which covers the outer wall of the valve body 1 .

[0066] The flexible sleeve 8 is made of rubber, silicone and other materials. By covering the flexible sleeve 8 on the outside of the valve body 1, the aesthetics of the PCV valve is improved while absorbing the collision energy between the PCV valve and other components when the engine is running, thereby improving the stability of the PCV valve.

[0067] An embodiment of the present application also provides an engine, comprising the PCV valve provided by any of the above embodiments.

[0068] On the other hand, an embodiment of the present application also provides a vehicle, comprising the engine provided by the above embodiment.

[0069] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0070] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0071] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A PCV valve, characterized in that: The PCV valve comprises: The valve body (1) is provided with an air inlet (11), a receiving cavity (12) and an air outlet (13) which are connected in sequence; A plunger assembly is arranged in the accommodating cavity (12), the plunger assembly comprising a plunger body (21) and a sealing plug (22), the sealing plug (22) being arranged at one end of the plunger body (21) close to the air inlet (11), the sealing plug (22) being a flexible member, the sealing plug (22) comprising a main body (221) and a protruding portion (222) connected to each other, the protruding portion (222) being protruding from a side of the main body (221) away from the plunger body (21), the outer diameter of the main body (221) being larger than the outer diameter of the protruding portion (222), and the shape and size of the protruding portion (222) being respectively adapted to the shape and size of the air inlet (11).

2. The PCV valve according to claim 1, characterized in that: A first rounded corner structure (3) is arranged between the side wall of the air inlet (11) and the end wall of the accommodating cavity (12), and the first rounded corner structure (3) is in the shape of an arc surface.

3. The PCV valve according to claim 2, characterized in that: A second rounded corner structure (4) is arranged between the protruding portion (222) and the main body portion (221); the second rounded corner structure (4) is in the shape of an arc surface, and the shape and size of the second rounded corner structure (4) are respectively matched with the shape and size of the first rounded corner structure (3).

4. The PCV valve according to claim 1, characterized in that: The PCV valve further comprises a first spring (5), wherein the first spring (5) is sleeved on the outer side of the plunger body (21); The accommodating cavity (12) comprises a first cavity (121) and a second cavity (122), wherein the first cavity (121) is connected to the air inlet (11), and the second cavity (122) is connected to the air outlet (13), and the inner diameter of the first cavity (121) is greater than the inner diameter of the second cavity (122), so as to form a first step surface (123) between the first cavity (121) and the second cavity (122), and the first step surface (123) is used to abut against the first spring (5).

5. The PCV valve according to claim 4, characterized in that: The PCV valve further comprises a valve seat (6), wherein the valve seat (6) is annular and is arranged on the side wall of the second cavity (122), and the valve seat (6) is used for allowing the plunger body (21) to pass through.

6. The PCV valve according to claim 4, characterized in that: The plunger assembly also includes a plunger tail (23), which is arranged at an end of the plunger body (21) away from the sealing plug (22), and the outer diameter of the plunger tail (23) is smaller than the outer diameter of the plunger body (21), and the outer diameter of the plunger tail (23) is smaller than the inner diameter of the exhaust port (13).

7. The PCV valve according to claim 6, characterized in that: The PCV valve further comprises a second spring (7), wherein the second spring (7) is sleeved on the outer side of the plunger tail (23); The inner diameter of the second cavity (122) is greater than the inner diameter of the exhaust port (13), so as to form a second step surface (124) between the second cavity (122) and the exhaust port (13), and the second step surface (124) is used to abut against the second spring (7).

8. The PCV valve according to claim 1, characterized in that: The PCV valve further comprises a flexible sleeve (8), wherein the flexible sleeve (8) covers the outer wall of the valve body (1).

9. An engine, characterized in that: The engine comprises the PCV valve according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the engine of claim 9.

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