PCV valve

Abstract

The utility model provides a PCV valve, and relates to the field of PCV valve structures. The PCV valve comprises a valve body assembly, a valve element and a valve element, wherein a containing cavity is formed in the valve body assembly; a fixing part is formed at the first end of the valve element in the extending direction; the spring assembly comprises a buffer spring and a compression spring which are correspondingly matched with the containing cavity, and the two ends of the buffer spring are connected with the inner wall of the containing cavity and the fixing part respectively, so that the buffer spring is always in a compressed state; the pressure spring is correspondingly arranged on the outer side portion of the valve element in a sleeving mode and is in interference fit with the valve element. Therefore, the stability of the buffer spring can be improved, and the buffer spring is effectively prevented from colliding with the inner wall of the valve cover under the disturbance of airflow; in addition, the buffer spring can support the first end of the valve element, further, the compression spring is arranged to be in interference fit with the valve element, the second end of the valve element can be supported, and therefore swinging of the valve element under the airflow disturbance effect can be effectively avoided.

Description

Technical Field

[0001] This application relates to the field of PCV valve structures, and in particular to a PCV valve. Background Technology

[0002] The PCV valve is an important component of the crankcase forced ventilation system. Its main function is to utilize the pressure difference between the intake manifold and the crankcase to draw the separated oil and gas into the combustion chamber for re-combustion, while automatically controlling the flow rate of crankcase gas entering the intake manifold and combustion chamber according to engine operating conditions. PCV valves have two basic structures: diaphragm type and valve core type. However, the diaphragm in the diaphragm type PCV valve is prone to damage and deformation due to prolonged contact with oil vapor, thus affecting the stability of the PCV valve's flow rate. Therefore, the valve core type PCV valve is currently more widely used.

[0003] Existing spool-type PCV valves mainly consist of a valve seat, valve plate, valve cover, valve spool, compression spring, and buffer spring. The buffer spring is a free spring of a specific length, primarily used to prevent the valve spool from rapidly moving upwards and impacting the valve cover when the engine is idling. However, under other operating conditions, the buffer spring is in an uncompressed state. Under airflow disturbances, the buffer spring is prone to shifting and oscillating, colliding with the valve cover orifice wall, leading to abnormal engine noise. Furthermore, the valve spool of existing spool-type PCV valves lacks effective support, making it susceptible to oscillation and impact with the valve plate under airflow disturbances, also causing abnormal engine noise. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a PCV valve to solve the problem that the buffer spring and valve core in the existing valve core type PCV valve are prone to swinging under airflow disturbance, which leads to abnormal engine noise.

[0005] To achieve the above objectives, this utility model provides a PCV valve, wherein the PCV valve comprises:

[0006] The valve body assembly has a receiving cavity;

[0007] A valve core is located in the receiving cavity and is capable of reciprocating along the extending direction of the receiving cavity; a fixing portion is formed at the first end of the extending direction of the valve core;

[0008] The spring assembly includes a buffer spring and a compression spring that are adapted to the receiving cavity. The two ends of the buffer spring are respectively connected to the inner wall of the receiving cavity and the fixing part, so that the buffer spring is always in a compressed state. The compression spring is correspondingly sleeved on the outer part of the valve core and is interference-fitted with the valve core.

[0009] Preferably, the valve body assembly includes a valve cover and a valve seat connected in sequence, the valve cover and the valve seat respectively forming a first inner cavity and a second inner cavity; a valve plate is provided at a first end of the valve seat near the valve cover, and a through hole is formed at the first end of the valve plate and the valve seat, the first inner cavity communicating with the second inner cavity through the through hole to form the receiving cavity.

[0010] Preferably, the second end of the valve core in the extending direction is located in the second inner cavity, and the first end of the valve core in the extending direction extends through the through hole into the first inner cavity.

[0011] Preferably, along the extending direction of the valve core, the valve core sequentially forms a guide section, a variable flow section, a constant flow section, and a limiting section; the fixing part is located on the end face of the guide section away from the variable flow section.

[0012] Preferably, the fixing part is formed as a columnar structure protruding from the guide section; the buffer spring is formed as a shuttle-shaped structure and located in the first inner cavity, the inner wall of the first end of the first inner cavity has a protrusion, the two ends of the buffer spring are respectively connected to the protrusion and the fixing part and are both formed as interference fit; the maximum diameter of the buffer spring is adapted to the inner wall of the first inner cavity.

[0013] Preferably, along the extension direction of the valve core, the outer diameters of the guide section, the variable flow section, the constant flow section, and the limiting section increase sequentially.

[0014] Preferably, both the guide section and the variable flow section are formed as variable diameter columnar structures;

[0015] Along the extension direction of the valve core, the outer diameter of the guide section gradually increases, and the diameter of the first end of the guide section is smaller than the diameter of the second end of the guide section;

[0016] Along the extension direction of the valve core, the outer diameter of the variable flow section gradually increases, and the diameter of the first end of the variable flow section is smaller than the diameter of the second end of the variable flow section.

[0017] Preferably, both the constant flow section and the limiting section are formed into cylindrical structures, the outer diameter of the constant flow section is smaller than the inner diameter of the through hole, and the outer diameter of the limiting section is larger than the outer diameter of the through hole.

[0018] Preferably, the compression spring is formed in a spindle-shaped structure and is located in the second inner cavity, and both ends of the compression spring are formed with the valve core in an interference fit; the maximum diameter of the compression spring is adapted to the inner wall of the second inner cavity.

[0019] Preferably, the valve cover further forms a third inner cavity for communicating with the intake manifold, the third inner cavity communicating with the first inner cavity.

[0020] According to the PCV valve of this invention, a fixing part is provided at the end of the valve core, and the two ends of the buffer spring are respectively connected to the inner wall of the receiving cavity and the fixing part, so that the buffer spring is always in a compressed state. This increases the stability of the buffer spring and effectively prevents the buffer spring from impacting the inner wall of the valve cover under airflow disturbance. In addition, the buffer spring also supports the first end of the valve core. Furthermore, by setting the compression spring corresponding to the receiving cavity to be interference-fitted with the valve core, it can support the second end of the valve core, thus effectively preventing the valve core from swaying under airflow disturbance. Based on this, the PCV valve of this invention can effectively eliminate the influence of airflow on the buffer spring and valve core, thereby preventing abnormal noise from the engine caused by the shaking of the buffer spring and valve core.

[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the first state of the PCV valve according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the second state of the PCV valve according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the third state of the PCV valve according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the valve core according to an embodiment of the present invention.

[0027] Icons: 1-Valve cover; 10-First inner cavity; 11-Third inner cavity; 2-Valve seat; 20-Second inner cavity; 21-Valve plate; 22-Through hole; 23-Small hole; 30-Buffer spring; 31-Compression spring; 4-Valve core; 40-Fixing part; 41-Guide section; 42-Variable flow section; 43-Constant flow section; 44-Limit section. Detailed Implementation

[0028] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0029] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0030] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0031] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0032] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0033] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0034] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0035] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0036] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0037] This utility model provides a PCV valve, such as Figures 1 to 4 As shown, the PCV valve includes a valve body assembly, a valve core 4, and a spring assembly. The valve body assembly forms a receiving cavity, and the valve core 4 and the spring assembly are correspondingly disposed in the receiving cavity. The valve core 4 is capable of reciprocating along the extending direction of the receiving cavity. The specific structure and connection relationship of the above-mentioned parts of the PCV valve according to this utility model will be described in detail below.

[0038] In this embodiment, as Figure 1As shown, the valve body assembly includes a valve cover 1 and a valve seat 2 connected in sequence. The valve cover 1 and the valve seat 2 respectively form a first inner cavity 10 and a second inner cavity 20. A valve plate 21 is provided at the first end of the valve seat 2 near the valve cover 1. A through hole 22 is formed at the first end of the valve plate 21 and the valve seat 2, so that the first inner cavity 10 can communicate with the second inner cavity 20 through the through hole 22 to form the aforementioned receiving cavity. Further, the extending direction of the first inner cavity 10 and the second inner cavity 20 is the same as the connection direction of the valve cover 1 and the valve body, and this direction is the extending direction of the valve core 4 and the movement direction of the valve core 4, which helps to improve the consistency of the overall structure of this PCV valve. In addition, the valve cover 1 also forms a third inner cavity 11 for communicating with the intake manifold, and the third inner cavity 11 communicates with the first inner cavity 10; the second end of the valve seat 2 (away from the valve cover 1) forms a small hole 23 for communicating the second inner cavity 20 with the crankcase. It should be noted that the specific structure and assembly relationship of components such as valve cover 1 and valve seat 2 are all existing technologies, and therefore will not be described in detail.

[0039] Furthermore, in this embodiment, as Figure 4 As shown, the valve core 4 is formed as a columnar structure. Along its extension direction, the valve core 4 sequentially forms a guide section 41, a variable flow section 42, a constant flow section 43, and a limiting section 44. Furthermore, the end where the guide section 41 is located is formed as the first end of the valve core 4, and the end where the limiting section 44 is located is formed as the second end of the valve core 4. The second end of the valve core 4 in the extension direction is located in the second inner cavity 20, while the first end of the valve core 4 in the extension direction extends through the through hole 22 into the first inner cavity 10.

[0040] Specifically, if Figure 4 As shown, both the guide section 41 and the variable flow section 42 are formed as variable diameter cylindrical structures. Along the extension direction of the valve core 4, the outer diameter of the guide section 41 gradually increases, and the diameter of the first end of the guide section 41 is smaller than the diameter of the second end of the guide section 41. Similarly, along the extension direction of the valve core 4, the outer diameter of the variable flow section 42 gradually increases, and the diameter of the first end of the variable flow section 42 is smaller than the diameter of the second end of the variable flow section 42. In addition, the constant flow section 43 and the limiting section 44 are both formed as cylindrical structures. The outer diameter of the constant flow section 43 is smaller than the inner diameter of the through hole 22 (the constant flow section 43 and the through hole 22 form a clearance fit, and the fit clearance is small), and the outer diameter of the limiting section 44 is larger than the outer diameter of the through hole 22.

[0041] More specifically, along the extension direction of the valve core 4, the outer diameters of the guide section 41, the variable flow section 42, the constant flow section 43, and the limiting section 44 increase sequentially, that is, the minimum outer diameter of the variable flow section 42 is greater than the maximum outer diameter of the guide section 41, and the outer diameter of the constant flow section 43 is greater than the maximum outer diameter of the variable flow section 42.

[0042] In this embodiment, when the engine is stopped (e.g. Figure 1 As shown, the guide section 41 extends into the first cavity, and the gap between the guide section 41 and the through hole 22 is relatively large. Thus, when the engine is running, the guide section 41 can provide initial guidance for the reciprocating motion of the valve core 4. Setting the guide section 41 as a variable diameter structure also helps to improve the stability of the overall structure of the valve core 4, thereby facilitating the realization of the inherent function of the valve core 4 to change the flow rate.

[0043] Furthermore, the variable flow section 42 forms the variable flow region of the valve core 4, which is the main working area of ​​the valve core 4. Within this region, the diameter of the valve core 4 varies at different height positions. When the engine is under low load (e.g., ...), the diameter changes accordingly. Figure 2 As shown), when the throttle opening is small, the pressure difference between the intake manifold and the crankcase is large, and the valve core 4 moves to a higher position, that is, the valve core 4 engages with the through hole 22 of the valve plate 21 at the second end of the variable flow section 42, with a small engagement clearance, resulting in a smaller flow rate; however, when the engine is under high load (such as...), the throttle opening is small, the pressure difference between the intake manifold and the crankcase is large, and the flow rate is small. Figure 3 As shown, with a larger throttle opening and a smaller pressure difference between the intake manifold and crankcase, the valve core 4 descends to a lower position. This means the first end of the variable flow section 42 of the valve core 4 engages with the through hole 22 of the valve plate 21, resulting in a larger clearance and thus a larger flow rate. Through optimized design of the valve core 4's diameter, the valve core 4 and the through hole 22 of the valve plate 21 maintain the optimal clearance at different heights, enabling precise control of the PCV valve flow rate.

[0044] Furthermore, when the engine is idling or decelerating (not shown in the figure), the valve core 4 moves to the high position, that is, the valve core 4 engages with the through hole 22 of the valve plate 21 in the constant flow section 43, and the engagement gap is very small, so the flow rate is very small.

[0045] It should be noted that there are no specific restrictions on the specific specifications of the various parts of the valve core 4, such as the length and diameter of each part. They should be determined based on the actual situation, such as the specifications of the valve plate 21 and the specifications of the PCV valve, as long as the above technical effects can be achieved.

[0046] In this embodiment, as Figures 1 to 3As shown, the spring assembly includes a buffer spring 30 disposed in the first cavity. The buffer spring 30 is formed into a shuttle-like shape, thereby increasing the stability of the buffer spring 30 through structural cooperation, so as to avoid it shaking and producing abnormal noise under airflow disturbance. Specifically, a fixing part 40 is provided at the first end of the valve core 4 in the extension direction. The fixing part 40 is specifically formed into a columnar structure protruding from the guide section 41. Correspondingly, a protrusion is also formed on the inner wall of the first end of the first inner cavity 10. The two ends of the buffer spring 30 are respectively connected to the protrusion and the fixing part 40 and are both formed with an interference fit, that is, the end of the buffer spring 30 is fixed by the valve cover 1 and the valve core 4. Further, the maximum diameter of the buffer spring 30 is adapted to the inner wall of the first inner cavity 10, that is, the maximum diameter of the buffer spring 30 is in critical contact with the first inner cavity 10. In this way, the inner wall of the first inner cavity 10 can support the buffer spring 30 without friction.

[0047] Thus, the above structure achieves stable support for the buffer spring 30. Additionally, the buffer spring 30 can guide the reciprocating motion of the valve core 4 and support the first end of the valve core 4. It should be noted that there are no specific limitations on the spring constant and other parameters of the buffer spring 30, as long as the aforementioned technical effect is achieved; however, it is necessary to ensure that the buffer spring 30 is always in a compressed state within the working range of the valve core 4 (this can be achieved by adjusting the natural length of the buffer spring 30) to ensure the buffering effect of the buffer spring 30 on the valve core 4.

[0048] In this embodiment, as Figures 1 to 3 As shown, the spring assembly also includes a compression spring 31 disposed in the second cavity. The compression spring 31 is also formed into a spindle-shaped structure and is correspondingly sleeved on the outer side of the valve core 4. Both ends of the compression spring 31 are formed with an interference fit to the valve core 4, and its maximum diameter is adapted to the inner wall of the second cavity. That is, the maximum diameter of the compression spring 31 is in critical contact with the first inner cavity 10. In this way, the inner wall of the second inner cavity 20 can support the compression spring 31 without friction. The compression spring 31 can then support the second end of the valve core 4. In other words, the spring assembly can prevent the valve core 4 from swinging under the action of airflow and producing abnormal noise.

[0049] According to the PCV valve of this utility model, a fixing part 40 is provided at the end of the valve core 4, and the two ends of the buffer spring 30 are respectively connected to the inner wall of the receiving cavity and the fixing part 40. The buffer spring 30 is set to be adapted to the first inner cavity 10 (that is, the inner wall of the first inner cavity 10 limits the buffer spring 30 at the maximum diameter), which can increase the stability of the buffer spring 30 and effectively prevent the buffer spring 30 from hitting the inner wall of the valve cover 1 under the disturbance of airflow. In addition, the buffer spring 30 can also support the first end of the valve core 4. Furthermore, by setting the compression spring 31 adapted to the second inner cavity 20 to be interference fit with the valve core 4, it can support the second end of the valve core 4 (the inner wall of the second inner cavity 20 limits the compression spring 31 at the maximum diameter), which can effectively prevent the valve core 4 from swinging under the disturbance of airflow. Based on this, the PCV valve of this utility model can effectively eliminate the influence of airflow on the buffer spring 30 and valve core 4, thereby avoiding the occurrence of abnormal noise in the engine due to the shaking of the buffer spring 30 and valve core 4.

[0050] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A PCV valve, characterized in that, The PCV valve includes: The valve body assembly has a receiving cavity; A valve core is located in the receiving cavity and is capable of reciprocating along the extending direction of the receiving cavity; a fixing portion is formed at the first end of the extending direction of the valve core; The spring assembly includes a buffer spring and a compression spring that are adapted to the receiving cavity. The two ends of the buffer spring are respectively connected to the inner wall of the receiving cavity and the fixing part, so that the buffer spring is always in a compressed state. The compression spring is correspondingly sleeved on the outer part of the valve core and is interference-fitted with the valve core.

2. The PCV valve according to claim 1, characterized in that, The valve body assembly includes a valve cover and a valve seat connected in sequence. The valve cover and the valve seat respectively form a first inner cavity and a second inner cavity. A valve plate is provided at a first end of the valve seat near the valve cover. A through hole is formed at the first end of the valve plate and the valve seat. The first inner cavity communicates with the second inner cavity through the through hole to form the receiving cavity.

3. The PCV valve according to claim 2, characterized in that, The second end of the valve core in the extending direction is located in the second inner cavity, and the first end of the valve core in the extending direction extends through the through hole into the first inner cavity.

4. The PCV valve according to claim 3, characterized in that, Along the extending direction of the valve core, the valve core sequentially forms a guide section, a variable flow section, a constant flow section, and a limiting section; the fixing part is located on the end face of the guide section away from the variable flow section.

5. The PCV valve according to claim 4, characterized in that, The fixing part is formed as a columnar structure protruding from the guide section; the buffer spring is formed as a shuttle-shaped structure and is located in the first inner cavity, the inner wall of the first end of the first inner cavity has a protrusion, the two ends of the buffer spring are respectively connected to the protrusion and the fixing part and are both formed as interference fit; the maximum diameter of the buffer spring is adapted to the inner wall of the first inner cavity.

6. The PCV valve according to claim 4, characterized in that, Along the extension direction of the valve core, the outer diameters of the guide section, the variable flow section, the constant flow section, and the limiting section increase sequentially.

7. The PCV valve according to claim 6, characterized in that, Both the guide section and the variable flow section are formed as variable diameter columnar structures; Along the extension direction of the valve core, the outer diameter of the guide section gradually increases, and the diameter of the first end of the guide section is smaller than the diameter of the second end of the guide section; Along the extension direction of the valve core, the outer diameter of the variable flow section gradually increases, and the diameter of the first end of the variable flow section is smaller than the diameter of the second end of the variable flow section.

8. The PCV valve according to claim 6, characterized in that, Both the constant flow section and the limiting section are formed into cylindrical structures. The outer diameter of the constant flow section is smaller than the inner diameter of the through hole, and the outer diameter of the limiting section is larger than the outer diameter of the through hole.

9. The PCV valve according to claim 8, characterized in that, The compression spring is formed into a spindle-shaped structure and is located in the second inner cavity. Both ends of the compression spring are formed with the valve core in an interference fit. The maximum diameter of the compression spring is adapted to the inner wall of the second inner cavity.

10. The PCV valve according to claim 2, characterized in that, The valve cover also has a third inner cavity for communicating with the intake manifold, the third inner cavity being in communication with the first inner cavity.

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