CN214787608U - Crankcase forced ventilation valve for improving NVH performance - Google Patents
Crankcase forced ventilation valve for improving NVH performance Download PDFInfo
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- CN214787608U CN214787608U CN202022747423.3U CN202022747423U CN214787608U CN 214787608 U CN214787608 U CN 214787608U CN 202022747423 U CN202022747423 U CN 202022747423U CN 214787608 U CN214787608 U CN 214787608U
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- hollow valve
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- pressure regulating
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Abstract
The utility model discloses a positive ventilation valve of crankcase for improving NVH performance, which comprises a shell, one end of the shell is provided with an air inlet and the other end is provided with an air outlet, an O-shaped retainer ring is embedded on the step surface of the air inlet end in the shell, the positive ventilation valve is characterized in that the inner cavity of the shell is provided with a hollow valve core which can move along the axial direction of the shell, the closed end of the hollow valve core faces towards the air inlet and the open end of the hollow valve core faces towards the air outlet, the side wall of the hollow valve core near the closed end is provided with at least one vent hole for communicating the air inlet and the air outlet, the side wall of the hollow valve core near the open end is in sliding fit with the inner wall of the shell, the end surface of the closed end of the hollow valve core is in sealing connection with the O-shaped retainer ring without external force, a pressure regulating spring is embedded in the hollow valve core, one end of the pressure regulating spring is propped against the step surface in the hollow valve core and the other end is propped against the end surface of the air outlet end in the shell, the valve core has the advantage of reducing the sound of knocking the shell by the valve core.
Description
Technical Field
The utility model relates to a crankcase forced ventilation valve especially relates to a crankcase forced ventilation valve for improving NVH performance.
Background
The function of a crankcase ventilation system (PCV system) is to prevent gases in the crankcase from being vented to the atmosphere. During engine operation, a portion of the combustible mixture and combustion products may be allowed to escape into the crankcase, which if not removed in time, may accelerate deterioration of the engine oil and cause corrosion of the components. But is not allowed to vent directly to the atmosphere because of the hydrocarbons contained therein. Therefore, it is generally introduced into the intake pipe by a PCV system and burned in the combustion chamber. The most important control element in the PCV system is the PCV valve for automatically adjusting the amount of gas flowing from the crankcase to the intake pipe according to changes in engine operating conditions.
English acronym for Noise, Vibration, and Harshness (Noise, Vibration, Harshness, NVH). This is a comprehensive measure of the quality of a vehicle's manufacture and gives the vehicle user the most immediate and surface experience. The NVH problem of vehicles is one of the concerns of various large vehicle manufacturing enterprises and component enterprises in the international automotive industry. Statistics show that 1/3 failure problem of the whole automobile is related to NVH problem of the automobile, and nearly 20% of research and development cost of each large company is consumed for solving the NVH problem of the automobile.
The existing positive crankcase ventilation valve (PCV valve) structure is shown in fig. 1, and includes a housing 1, an air inlet 2 is provided at one end of the housing 1, an air outlet 3 is provided at the other end of the housing 1, a valve core 4 capable of moving along the axial direction of the housing 1 is provided in an inner cavity of the housing 1, a buffer spring 5 close to the air inlet 2 and a pressure regulating spring 6 close to the air outlet 3 are provided, the buffer spring 5 is sleeved outside the valve core 4, one end of the pressure regulating spring 6 abuts against the valve core 4 and the other end abuts against a valve core sheet 7 in the housing 1, one end of the pressure regulating spring 6 is connected to the inner wall of the housing 1, and the other end is in a free state. The buffer spring 5 acts on the valve core 4 to enable the valve core 4 to seal the air inlet 2; the pressure regulating spring 6 is used for preventing the front end of the valve core 4 from moving forward under pressure difference and blocking the air outlet 3, the front section of the valve core 4 is provided with a slope, so that a gap with an adjustable size is formed between the valve core 4 and the shell 1, and the valve core 4 regulates the air flow between the air inlet 2 and the air outlet 3 in a reciprocating motion mode along the inner cavity of the shell 1.
When the engine does not run, the PCV valve is closed under the action of the buffer spring 5; when the engine runs, the valve core 4 compresses the buffer spring 5 under the action of large vacuum of the air inlet pipe of the engine, and the valve core 4 moves forwards along the axial direction of the shell 1, so that the gap between the valve core 4 and the inner wall of the shell 1 is reduced, and the flow entering the air inlet pipe is reduced. When the intake pressure or the rotating speed is unstable, the valve core 4 can vibrate up and down and continuously impact the inner wall of the PCV casing, so that larger noise is generated.
Disclosure of Invention
The utility model aims to solve the technical problem that a crankcase forced ventilation valve for improving NVH performance is provided.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides a crankcase forced draft valve for improving NVH performance, includes the casing, the one end of casing have the air inlet and its other end has the gas outlet, the step face of air inlet end in the casing on the inlay card be provided with O type retaining ring, the inner chamber of casing be provided with can follow its axial displacement's hollow valve core, the blind end orientation of hollow valve core the air inlet and its open end orientation the gas outlet, the hollow valve core on be close to the lateral wall of blind end and be provided with at least one and be used for the intercommunication the air inlet with the air vent, the hollow valve core on be close to the lateral wall of open end with the inner wall sliding fit of casing.
The hollow valve core is internally embedded with a pressure regulating spring, one end of the pressure regulating spring is propped against the step surface in the hollow valve core, and the other end of the pressure regulating spring is propped against the step surface at the air outlet end in the shell.
A buffer spring is arranged between the end face of the open end of the hollow valve core and the step face of the air outlet end in the shell, and the buffer spring is sleeved on the periphery of the pressure regulating spring.
The cylinder that the cavity case has the step for the outer wall and reduces in proper order to the open end diameter from its blind end, the little diameter section outer wall cover of cavity case be equipped with pressure regulating spring, pressure regulating spring one end top lean on the outer step face of cavity case on and its other end top lean on in the middle step face in the casing on, the open end terminal surface of cavity case with the casing in be provided with buffer spring between the gas outlet end step face.
The end face of the closed end of the hollow valve core is in sealing connection with the O-shaped retainer ring under the action of no external force.
The center of the end face of the closed end of the hollow valve core is provided with a circular truncated cone-shaped bulge which plays a role in guiding gas, and the outer diameter of the circular truncated cone-shaped bulge is smaller than the inner diameter of the O-shaped retainer ring.
The hollow valve core is made of light materials.
Compared with the prior art, the utility model has the advantages of
1. The outer diameter of the valve core is in precise clearance fit with the inner diameter of the shell, so that the sound generated when the valve core knocks the inner wall of the shell is reduced;
2. the valve core is made of light materials such as aluminum and the like, so that abnormal sound generated by knocking the retainer ring when the valve core is reset is reduced;
3. and a buffer spring is added to prevent the pressure regulating spring from being compressed and the valve core from knocking the end face of the valve body to generate abnormal sound.
Drawings
FIG. 1 is a schematic diagram of a prior art PCV valve;
FIG. 2 is a schematic structural diagram of a PCV valve in embodiment 1 of the present invention
Fig. 3 is a first schematic structural diagram of a hollow valve element in embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a hollow valve element in embodiment 1 of the present invention;
fig. 5 is a cross-sectional view of a hollow valve element in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a PCV valve in embodiment 2 of the present invention
Fig. 7 is a first schematic structural diagram of a hollow valve element in embodiment 2 of the present invention;
fig. 8 is a second schematic structural view of a hollow valve element in embodiment 2 of the present invention;
fig. 9 is a sectional view of a hollow valve element in embodiment 2 of the present invention;
fig. 10 is a schematic structural diagram of a PCV valve according to embodiment 3 of the present invention
Fig. 11 is a first schematic structural view of a hollow valve element in embodiment 3 of the present invention;
fig. 12 is a second schematic structural view of a hollow valve element in embodiment 3 of the present invention;
fig. 13 is a sectional view of a hollow valve element according to embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example 1
A positive crankcase ventilation valve for improving NVH performance is disclosed, as shown in FIG. 2, FIG. 3, FIG. 4 and FIG. 5, which comprises a casing 1, one end of the casing is provided with an air inlet 2 and the other end is provided with an air outlet 3, an O-shaped retainer ring 8 is embedded on the step surface of the air inlet end in the casing 1, a hollow valve core 4 capable of moving along the axial direction of the hollow valve core is arranged in the inner cavity of the casing 1, the closed end of the hollow valve core 4 faces the air inlet 2 and the open end faces the air outlet 3, at least one vent hole 9 for communicating the air inlet 2 with the air outlet 3 is arranged on the side wall of the hollow valve core 4 close to the closed end, and the side wall of the hollow valve core 4 close to the open end is in sliding fit with the inner wall of the casing 1.
In this embodiment, a pressure regulating spring 5 is embedded in the hollow valve core 4, one end of the pressure regulating spring 5 abuts against a step surface in the hollow valve core 4, and the other end abuts against a step surface at the air outlet end in the housing 1. The end face of the closed end of the hollow valve core 4 is hermetically connected with the O-shaped retainer ring 8 under the action of no external force. The center of the end face of the closed end of the hollow valve core 4 is provided with a truncated cone-shaped bulge 10 which plays a role in guiding gas, and the outer diameter of the truncated cone-shaped bulge 10 is smaller than the inner diameter of the O-shaped retainer ring 8. The hollow valve core 4 is made of light materials.
Example 2
As shown in fig. 6, 7, 8 and 9, the difference from embodiment 1 is that: a buffer spring 6 is arranged between the end face of the opening end of the hollow valve core 4 and the step face of the air outlet end in the shell 1, and the buffer spring 6 is sleeved on the periphery of the pressure regulating spring 5.
Example 3
As shown in fig. 10, 11, 12 and 13, the difference from embodiment 1 is that: the cylinder that hollow valve core 4 has the step for the outer wall and reduces in proper order from its blind end to open end diameter, the minor diameter section outer wall cover of hollow valve core 4 is equipped with pressure regulating spring 5, pressure regulating spring 5 one end top is leaned on the outer step face of hollow valve core 4 and its other end top is leaned on the middle step face in casing 1 (be located between 2 end step faces of air inlet of casing 1 and 3 end step faces of gas outlet), be provided with buffer spring 6 between the open end terminal surface of hollow valve core 4 and the gas outlet end step face in the casing 1.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Those skilled in the art should also realize that changes, modifications, additions, or substitutions can be made without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a crankcase forced draft valve for improving NVH performance, includes the casing, the one end of casing have the air inlet and its other end has the gas outlet, the air inlet in the casing end step face on the inlay card be provided with O type retaining ring, its characterized in that: the inner cavity of the shell is provided with a hollow valve core capable of moving along the axial direction of the shell, the closed end of the hollow valve core faces the air inlet, the open end of the hollow valve core faces the air outlet, the side wall of the hollow valve core close to the closed end is provided with at least one vent hole for communicating the air inlet and the air outlet, and the side wall of the hollow valve core close to the open end is in sliding fit with the inner wall of the shell.
2. A positive crankcase ventilation valve for improving NVH performance according to claim 1 wherein: the hollow valve core is internally embedded with a pressure regulating spring, one end of the pressure regulating spring is propped against the step surface in the hollow valve core, and the other end of the pressure regulating spring is propped against the step surface at the air outlet end in the shell.
3. A positive crankcase ventilation valve for improving NVH performance according to claim 2 wherein: a buffer spring is arranged between the end face of the open end of the hollow valve core and the step face of the air outlet end in the shell, and the buffer spring is sleeved on the periphery of the pressure regulating spring.
4. A positive crankcase ventilation valve for improving NVH performance according to claim 1 wherein: the cylinder that the cavity case has the step for the outer wall and reduces in proper order to the open end diameter from its blind end, the little diameter section outer wall cover of cavity case be equipped with pressure regulating spring, pressure regulating spring one end top lean on the outer step face of cavity case on and its other end top lean on in the middle step face in the casing on, the open end terminal surface of cavity case with the casing in be provided with buffer spring between the gas outlet end step face.
5. A positive crankcase ventilation valve for improving NVH performance according to claim 1 wherein: the end face of the closed end of the hollow valve core is in sealing connection with the O-shaped retainer ring under the action of no external force.
6. A positive crankcase ventilation valve for improving NVH performance according to any one of claims 1-5, wherein: the center of the end face of the closed end of the hollow valve core is provided with a circular truncated cone-shaped bulge which plays a role in guiding gas, and the outer diameter of the circular truncated cone-shaped bulge is smaller than the inner diameter of the O-shaped retainer ring.
7. A positive crankcase ventilation valve for improving NVH performance according to claim 6, wherein: the hollow valve core is made of light materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022747423.3U CN214787608U (en) | 2020-11-24 | 2020-11-24 | Crankcase forced ventilation valve for improving NVH performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022747423.3U CN214787608U (en) | 2020-11-24 | 2020-11-24 | Crankcase forced ventilation valve for improving NVH performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214787608U true CN214787608U (en) | 2021-11-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022747423.3U Active CN214787608U (en) | 2020-11-24 | 2020-11-24 | Crankcase forced ventilation valve for improving NVH performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214787608U (en) |
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2020
- 2020-11-24 CN CN202022747423.3U patent/CN214787608U/en active Active
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