CN210686080U - Novel valve oil seal - Google Patents
Novel valve oil seal Download PDFInfo
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- CN210686080U CN210686080U CN201921872564.9U CN201921872564U CN210686080U CN 210686080 U CN210686080 U CN 210686080U CN 201921872564 U CN201921872564 U CN 201921872564U CN 210686080 U CN210686080 U CN 210686080U
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Abstract
The utility model relates to a novel valve oil seal, which comprises a rubber body, wherein a framework is vulcanized in the rubber body to form a valve oil seal, and a spring groove is arranged on the outer journal at the upper end of the valve oil seal and an oil seal spring is arranged; a sealing lip is arranged on the inner side of the upper end of the valve oil seal, and a pressure-reducing and temperature-reducing lip is arranged on the lower section of the sealing lip to form a secondary lip; wherein, the pressure and temperature reducing lip is circumferentially provided with a recess to form an oil storage tank; an automatic centering lip is arranged on the inner side of the rubber body between the sealing lip and the pressure-reducing and temperature-reducing lip, and a plurality of salient points are uniformly arranged on the automatic centering lip in the circumferential direction, so that the automatic centering lip is formed into a salient point lip; the end face formed by the rubber body at the lower end of the valve oil seal and the oil seal framework is provided with a bottom surface seal, and the bottom surface seal structure is composed of one or more sealing ribs. The novel automatic centering lip seal adopts the automatic centering lip to stabilize the position of the seal lip; the pressure reduction and temperature reduction lip is adopted to prevent air leakage, so that a stable working environment is maintained for the sealing lip, the leakage amount is stable and controllable, and the service life of the oil seal is prolonged.
Description
Technical Field
The utility model relates to a sealing device between automobile engine valve stem and valve guide specifically is a novel valve oil blanket.
Background
With the rapid development of the automobile industry, users have higher and higher requirements on the reliability, the sealing performance and the like of an engine assembly. The valve oil seal is one of important parts of an engine valve group and is mainly used for sealing an engine valve guide rod, so that engine oil can be prevented from entering an air inlet (exhaust) pipe to cause engine oil loss, mixed gas of gasoline and air and exhaust waste gas can be prevented from leaking, and engine oil of an engine can be prevented from entering a combustion chamber.
The valve oil seal is one kind of oil seal, and is formed by vulcanizing metal skeleton and rubber together, and the sealing lip is equipped with self-tightening spring or steel wire. The valve oil seal works in a high-speed reciprocating motion on a valve guide rod, is in contact with gasoline and engine oil, and has the highest temperature of 200 ℃, so that the valve seal needs to be made of a material with excellent heat resistance and oil resistance, and the material is usually made of fluororubber.
The valve oil seal is required to supply a small amount of lubricating oil in order to lubricate between the valve guide rod and the guide sleeve, and simultaneously, excessive lubricating oil is prevented from entering a combustion chamber of a cylinder for combustion, so the valve oil seal is also called as flow control seal. The parameter design of the valve oil seal is crucial to the sealing of the valve oil seal, and the shape of the sealing lip is designed into a sharp corner or a fillet, the size of the R value of the axial distance from the center line of the spring to the minimum diameter size of the lip, the interference magnitude of the lip, the angles of two reciprocating motions and the like are important factors influencing the flow rate. If the lip is sharp, the initial sealing is good, but the lip is free of lubrication, easy to wear and short in service life; if the lip is a fillet, the fillet has large flow and small flow; the magnitude of the spring force is the key for prolonging the service life of the guide rod oil seal. At present, with the increase of the rotating speed of an automobile engine and the continuous increase of emission, the requirements on the valve oil seal are stricter and stricter.
Automotive engines generate power by combusting fuel in cylinders to do work. In order to improve the output power, various automobile factories change a naturally aspirated engine into a turbocharged engine, after supercharging, the pressure and the temperature of the engine during working are greatly increased, the pressure difference between a medium side and a combustion chamber is increased, and meanwhile, high-temperature hot gas in the combustion chamber can flee to a main lip, so that the temperature of the lip of an oil seal is obviously increased; and because of the concentricity of the valve seat ring and the inner hole of the valve pipe, the eccentricity generated by the clearance between the valve rod and the guide pipe enables the radial force of the valve oil seal acting on the valve rod to be reduced unilaterally, thereby increasing the oil leakage of the oil seal, reducing the sealing action of the valve oil seal with the traditional structure, easily causing the engine oil leakage, causing the engine oil sintering to generate carbon deposition, and greatly shortening the service life of the traditional valve oil seal. Therefore, a valve oil seal which has better sealing performance, is not easy to leak engine oil and has long service life needs to be developed.
The middle lip of the valve oil seal disclosed in EP2241730a1 cannot store oil, the seal lip cannot exhaust gas, and the friction cannot be solved, while the middle lip of the valve oil seal disclosed in EP1890058a1 cannot store oil, although the seal lip exhausts gas in an intermittent state, the friction continues to exist.
The valve oil seal with the air sealing lip structure provided by CN202065025U also cannot store oil.
The invention content is as follows:
the utility model aims at providing a leakproofness is good, can solve because pressure and temperature when turbocharged engine work all rise greatly, and the problem that the machine oil leakage quantity increase leads to the machine oil sintering to produce the carbon deposit, and the function of oil storage is realized to lip in the while, specially provides a novel valve oil blanket.
Therefore, the technical scheme of the utility model is that the novel valve oil seal comprises a rubber body, a framework is vulcanized in the rubber body to form the valve oil seal, and a spring groove is arranged on the outer journal at the upper end of the valve oil seal and an oil seal spring is arranged; the inboard sealing lip that is equipped with of valve oil seal upper end its characterized in that: the lower section of the sealing lip is provided with a pressure-reducing and temperature-reducing lip to form a second lip; wherein, the pressure and temperature reducing lip is circumferentially provided with a recess to form an oil storage tank; an automatic centering lip is arranged on the inner side of the rubber body of the valve oil seal between the sealing lip and the pressure-reducing and temperature-reducing lip.
The further improvement lies in that: the automatic centering lip is provided with a plurality of salient points along the circumferential direction, so that the lip can be automatically centered to form a salient point lip.
The further improvement lies in that: the end face formed by the rubber body at the lower end of the valve oil seal and the oil seal framework is provided with a bottom surface seal, and the bottom surface seal structure is composed of one or more sealing ribs.
The further improvement lies in that: the circumferential central line position of the automatic centering lip is lower than the circumferential central line of the oil seal spring.
Has the advantages that:
the novel automatic centering lip seal adopts the automatic centering lip to stabilize the position of the seal lip; the pressure reduction and temperature reduction lip is adopted to prevent air leakage, so that a stable working environment is maintained for the sealing lip, the leakage amount is stable and controllable, and the service life of the oil seal is prolonged.
When the back pressure is increased, the pressure-reducing and temperature-reducing lip is tightly contacted with the valve rod, the bottom pressure is isolated, so that the pressure cannot reach the sealing lip part, and meanwhile, the hot gas blown up by a combustion chamber cannot reach the sealing lip part due to the prevention of the lip, so that a stable working environment is maintained for the sealing lip, and the service life of the oil seal is prolonged; the pressure and temperature reducing lips are in a two-way lip structure form, so that the air pressure of the sealing lip can be reduced, and a little oil can be stored between the pressure and temperature reducing lips for lubrication;
if the valve rod is eccentric, the valve rod can be slightly contacted by the automatic centering lip in a point shape, so that the sealing lip opening is automatically corrected, the automatic centering lip structure adopts a plurality of convex points, the contact surface is less, and the friction force can be reduced.
The middle lip can be automatically stabilized in position, so that the main lip is automatically corrected, and the problems of eccentric wear and the like caused by the fact that the inner diameters of the valve guide rod and the valve guide pipe are not concentric are solved.
The determination of the position of the centre line allows the seal lip to be automatically corrected.
The bottom sealing structure is composed of one or more sealing ribs, and can prevent lubricating oil from leaking into the cavity from a gap between the outer diameter of the valve guide pipe and the cylinder head cover.
Description of the drawings:
fig. 1 is a schematic sectional structure of the present invention.
Figure 2 is a schematic view of one stage of vulcanization of the present invention.
FIG. 3 is a schematic diagram of the two-stage vulcanization of the present invention
In the figure, 1 is a rubber body, 2 is a framework, 3 is an oil seal spring, 4 is a seal lip, 5 is an automatic centering lip, 51 is a convex point, 6 is a pressure and temperature reduction lip, 61 is a concave point, and 7 is bottom surface seal.
Detailed Description
The utility model is shown in figures 1-3.
A novel valve oil seal comprises a rubber body 1, a framework 2 is vulcanized in the rubber body 1 to form a valve oil seal, a spring groove is arranged on an outer journal at the upper end of the valve oil seal, and an oil seal spring 3 is installed; a sealing lip 4 is arranged on the inner side of the upper end of the valve oil seal, and a pressure-reducing and temperature-reducing lip 6 is arranged on the lower section of the sealing lip 4 to form a secondary lip; wherein, the pressure and temperature reducing lip 6 is circumferentially provided with a recess 61 to form an oil storage tank; an automatic centering lip 5 is arranged on the inner side of the rubber body 1 of the valve oil seal between the sealing lip 4 and the pressure-reducing and temperature-reducing lip 6.
The automatic centering lip 5 is uniformly provided with a plurality of salient points 51 along the circumferential direction, so that the automatic centering lip 5 forms a salient point lip.
The end face formed by the rubber body 1 and the framework 2 at the lower end of the valve oil seal is provided with a bottom surface seal 7, and the bottom surface seal structure is composed of one or more sealing ribs.
The circumferential central line position of the automatic centering lip 5 is lower than the circumferential central line of the oil seal spring 3.
FIG. 2 shows that the rubber body 1 and the framework 2 are molded and vulcanized into a whole by a rubber mold.
Fig. 3 is a two-stage vulcanized, trim sleeve spring 3.
Claims (4)
1. A novel valve oil seal comprises a rubber body (1), a framework (2) is vulcanized in the rubber body (1) to form a valve oil seal, a spring groove is arranged on an outer journal at the upper end of the valve oil seal, and an oil seal spring (3) is installed; valve oil blanket upper end inboard be equipped with sealing lip (4), its characterized in that: the lower section of the sealing lip (4) is provided with a pressure-reducing and temperature-reducing lip (6) to form a second lip; wherein, a depression (61) is arranged on the pressure and temperature reducing lip (6) in the circumferential direction to form an oil storage tank; an automatic centering lip (5) is arranged on the inner side of the valve oil seal rubber body (1) between the sealing lip (4) and the pressure-reducing and temperature-reducing lip (6).
2. A novel valve oil seal according to claim 1, characterized in that: the automatic centering lip (5) is uniformly provided with a plurality of salient points (51) in the circumferential direction, so that the automatic centering lip (5) forms a salient point lip.
3. A novel valve oil seal according to claim 1, characterized in that: the end face formed by the rubber body (1) and the framework (2) at the lower end of the valve oil seal is provided with a bottom surface seal (7), and the structure of the bottom surface seal (7) consists of one or more sealing ribs.
4. A novel valve oil seal according to claim 1, characterized in that: the circumferential central line position of the automatic centering lip (5) is lower than the circumferential central line of the oil seal spring (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921872564.9U CN210686080U (en) | 2019-11-02 | 2019-11-02 | Novel valve oil seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921872564.9U CN210686080U (en) | 2019-11-02 | 2019-11-02 | Novel valve oil seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210686080U true CN210686080U (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921872564.9U Active CN210686080U (en) | 2019-11-02 | 2019-11-02 | Novel valve oil seal |
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| CN (1) | CN210686080U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627928A (en) * | 2020-12-10 | 2021-04-09 | 潍柴动力股份有限公司 | Valve stem sealing sleeve, valve and engine |
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2019
- 2019-11-02 CN CN201921872564.9U patent/CN210686080U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627928A (en) * | 2020-12-10 | 2021-04-09 | 潍柴动力股份有限公司 | Valve stem sealing sleeve, valve and engine |
| CN112627928B (en) * | 2020-12-10 | 2022-04-26 | 潍柴动力股份有限公司 | Valve stem sealing sleeve, valve and engine |
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