CN114746678A - Valve stem seal - Google Patents
Valve stem seal Download PDFInfo
- Publication number
- CN114746678A CN114746678A CN202180006892.4A CN202180006892A CN114746678A CN 114746678 A CN114746678 A CN 114746678A CN 202180006892 A CN202180006892 A CN 202180006892A CN 114746678 A CN114746678 A CN 114746678A
- Authority
- CN
- China
- Prior art keywords
- inner ring
- seal
- cylindrical portion
- valve stem
- slip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The invention provides a valve stem seal which can prevent a valve stem seal (11) from falling off from a valve stem guide (61) even if a large port pressure acts on the valve stem seal (11). The valve stem seal (11) has an inner ring (21) fixed to the valve stem guide (61), a rubber-like elastic seal (31) held by the inner ring (21), and an outer ring (41) disposed on the outer peripheral side of the inner ring (21). The inner ring (21) has a cylindrical portion (22) that fits to the outer peripheral side of the valve rod guide (61), and a flange portion (23) that is provided radially inward from the upper end of the cylindrical portion (22). The outer ring (41) has a cylindrical portion (42), a spring receiving portion (43) that is provided at the lower end of the cylindrical portion (42) and receives the valve spring (101), and an inner ring disengagement prevention portion (44) that is provided at the upper end of the cylindrical portion (42) and prevents the inner ring (21) from disengaging from the stem guide (61).
Description
Technical Field
The invention relates to a valve stem seal.
Background
Conventionally, a stem seal 51 shown in fig. 3 is known (see patent document 1).
The stem seal 51 includes a reinforcing ring 52 and a seal 53 made of a rubber-like elastic material and held by the reinforcing ring 52.
For example, as shown in fig. 4, the valve stem seal 51 is attached to the upper end portion of the valve stem guide 61 in the intake/exhaust valve mechanism of the engine, and slidably contacts the outer peripheral surface of the valve stem 71, thereby playing a role of adjusting the amount of oil leakage so that the oil (not shown) in the oil chamber O does not leak to the port P side by a large amount. Reference numeral 91 denotes a cam which moves the valve stem 71 forward to open the valve 81. Reference numeral 101 denotes a valve spring which moves the valve rod 71 rearward to close the valve 81.
Further, since the port pressure (back pressure) on the port P side acts on the stem seal 51, the stem seal 51 also has an effect of stabilizing the amount of oil leakage when the port pressure is applied.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2003-343733
Disclosure of Invention
Technical problem to be solved by the invention
However, as a recent trend, low fuel consumption is demanded for the engine, and accompanying this, the port pressure tends to increase due to downsizing of the engine, provision of a turbocharger, and the like.
Therefore, a further improvement is required so that the stem seal 51 does not fall off from the stem guide 61 even if a large port pressure acts on the stem seal 51.
The present invention addresses the problem of providing a stem seal that can prevent the stem seal from falling off from a stem guide even when a large port pressure acts on the stem seal.
Means for solving the technical problem
The valve stem seal of the present invention is characterized by comprising an inner ring fixed to a valve stem guide, a rubber-like elastic seal held by the inner ring, and an outer ring disposed on the outer peripheral side of the inner ring, wherein the inner ring has a cylindrical portion fitted to the outer peripheral side of the valve stem guide, and a flange portion provided radially inward from the upper end of the cylindrical portion, and the outer ring has a cylindrical portion, a spring receiving portion provided at the lower end of the cylindrical portion and receiving a valve spring, and an inner ring disengagement prevention portion provided at the upper end of the cylindrical portion and preventing the inner ring from disengaging from the valve stem guide.
Effects of the invention
According to the present invention, it is possible to provide a stem seal that can suppress the stem seal from falling off from the stem guide even when a large port pressure acts on the stem seal.
Drawings
Fig. 1 is a sectional view showing an assembled state of a stem seal according to a first embodiment.
Fig. 2 is a sectional view showing an assembled state of a stem seal according to a second embodiment.
Fig. 3 is a half sectional view of a stem seal according to the background art.
Fig. 4 is an explanatory diagram showing an assembled state of the same stem seal.
Detailed Description
(first embodiment)
As shown in fig. 1, the stem seal 11 includes a metal inner ring 21 fixed to the stem guide 61, a rubber-like elastic seal 31 held by the inner ring 21, and a metal outer ring 41 disposed on the outer peripheral side of the inner ring 21.
The inner ring 21 integrally has a cylindrical portion 22 and a flange portion 23, the cylindrical portion 22 is fitted to the upper end outer periphery of the stem guide 61, and the flange portion 23 is provided radially inward from the upper end of the cylindrical portion 22.
The seal 31 integrally has a seal lip 32, which is held by the flange portion 23 of the inner ring 21 and slidably contacts the outer peripheral surface of the valve stem 71, and an inner peripheral seal portion 33, which is held by the cylindrical portion 22 of the inner ring 21 and contacts the outer peripheral surface of the valve stem guide 61 in a stationary state. A garter spring 34 is fitted to the seal lip 32.
The inner peripheral seal portion 33 is interposed between the cylindrical portion 22 of the inner ring 21 and the stem guide 61 and is compressed in the radial direction during assembly, and thus a fitting margin of the cylindrical portion 22 of the inner ring 21 with respect to the stem guide 61 is set. Therefore, the cylindrical portion 22 of the inner ring 21 is fitted and fixed to the stem guide 61 via the inner peripheral seal portion 33.
Since the seal 31 is bonded (cross-linked and bonded) to the inner ring 21, the seal 31 and the inner ring 21 are formed as an integral molded article.
An annular recessed portion 62 is provided on the outer peripheral surface of the stem guide 61, an annular projecting portion 35 is provided on the inner peripheral surface of the inner peripheral seal portion 33 in correspondence with the recessed portion 62, and the projecting portion 35 is fitted into the recessed portion 62 and engaged in the axial direction, thereby providing a disengagement preventing engagement portion 36 that prevents the inner ring 21 from coming off the stem guide 61.
However, since the port pressure tends to increase in recent years as described above, there is a possibility that the slip-off preventing effect is insufficient only by the slip-off preventing engagement portion 36 configured to engage the convex portion 35 and the concave portion 62 made of a rubber-like elastic material which is more easily elastically deformed than metal.
Therefore, in the present embodiment, the following measures are taken to increase the slip-off prevention effect.
That is, in the first embodiment, as described above, the metal outer ring 41 is disposed on the outer peripheral side of the inner ring 21.
The outer ring 41 has a cylindrical portion 42 disposed on the outer peripheral side of the cylindrical portion 22 of the inner ring 21, and a flange-like spring receiving portion (also referred to as a spring seat) 43 for receiving one end of the valve spring 101 is integrally provided at the lower end of the cylindrical portion 42 so as to face radially outward.
An inner ring slip-off prevention portion 44 for preventing the inner ring 21 from slipping off from the stem guide 61 is integrally provided at the upper end of the cylindrical portion 42, and in the present embodiment, the inner ring slip-off prevention portion 44 is provided as a flange-shaped slip-off prevention portion disposed on the slip-off side (upper side) of the flange portion 23 of the inner ring 21.
The spring receiving portion 43 is pressed against the cylinder head 111 by the valve spring 101 at the time of assembly, whereby the outer ring 41 is fixed to the cylinder head 111. Therefore, even if the inner ring 21 is about to fall off upward from the stem guide 61, the flange portion 23 comes into contact with the inner ring falling-off prevention portion 44 and stops, and therefore, the fall-off of the inner ring 21 and the fall-off of the stem seal 11 can be suppressed.
The flange portion 23 and the inner ring slip-off prevention portion 44 may be in contact with each other in the initial state, but an axial initial gap c1 may be set between the flange portion 23 and the inner ring slip-off prevention portion 44 as shown in the drawing. When the initial clearance c1 in the axial direction is set in this way, it is possible to prevent a situation in which the outer ring 41 is short of size and the spring receiving portion 43 does not contact (seat) the cylinder head 111. In this case, the slip-off prevention function can be exerted after the inner ring 21 has moved by the amount of the initial clearance c 1. A part of the seal 31 may be interposed between the flange portion 23 and the inner ring slip-off preventing portion 44.
Further, a radial gap c2 may be set as shown in the drawing between the cylindrical portion 22 of the inner ring 21 and the cylindrical portion 42 of the outer ring 41, and when the radial gap c2 is set as described above, the outer ring 41 does not interfere with the inner ring 21 when the outer ring 41 is assembled by a post-assembly method, and therefore, the post-assembly operation of the outer ring 41 can be easily performed.
Further, since the seal 31 and the inner ring 21 are formed as an integrally molded product, if there are finished products or commercially available products having the same structure, they can be used as they are.
(second embodiment)
In the first embodiment described above, the inner ring slip-off preventing portion 44 is provided as a flange-like slip-off preventing portion disposed on the slip-off side of the flange portion 23 of the inner ring 21, but instead, the inner ring slip-off preventing portion 44 may be provided as a cylindrical slip-off preventing portion fitted into the inner ring 21.
That is, as shown in fig. 2, an inner ring slip-off preventing portion 44 for preventing the inner ring 21 from slipping off from the stem guide 61 is integrally provided at the upper end of the cylindrical portion 42 of the outer ring 41, and in the present embodiment, the inner ring slip-off preventing portion 44 is provided as a cylindrical slip-off preventing portion fitted to the outer periphery of the lower end of the cylindrical portion 22 of the inner ring 21.
In the second embodiment, the fitting is a so-called metal fitting in which metals are fitted to each other, and the inner ring retaining portion 44 is firmly fitted and fixed to the cylindrical portion 22 of the inner ring 21. Therefore, even if the inner ring 21 is to be separated upward from the stem guide 61, the inner ring 21 is held by the inner ring separation prevention portion 44, and therefore, the separation of the inner ring 21 and the separation of the stem seal 11 can be suppressed.
The other configurations and operational effects of the stem seal 11 according to the second embodiment are the same as those of the stem seal 11 according to the first embodiment. Therefore, the same reference numerals as those in fig. 1 are assigned to fig. 2 and the description thereof is omitted.
In the first and second embodiments, the material of the outer ring 41 is not limited to metal, and may be other materials. As a modification, the outer ring 41 may be formed of, for example, a resin material.
Description of reference numerals:
11 valve stem seal
21 inner ring
22 cylindrical part
23 Flange part
31 sealing element
32 sealing lip
33 inner peripheral seal part
34 clamping spring
35 convex part
36 anti-release engaging part
41 outer ring
42 cylindrical part
43 spring receiving part
44 inner ring slip-off prevention part
61 valve stem guide
62 recess
71 valve stem
101 valve spring
111 working cylinder cover
c1, c 2.
Claims (3)
1. A valve stem seal characterized in that,
the valve rod seal includes an inner ring fixed to a valve rod guide, a rubber-like elastic seal held by the inner ring, and an outer ring disposed on an outer peripheral side of the inner ring,
the inner ring has a cylindrical portion fitted to an outer peripheral side of the stem guide, and a flange portion provided radially inward from an upper end of the cylindrical portion,
the outer ring has a cylindrical portion, a spring receiving portion provided at a lower end of the cylindrical portion and receiving a valve spring, and an inner ring detachment prevention portion provided at an upper end of the cylindrical portion and preventing the inner ring from detaching from the valve stem guide.
2. The valve stem seal of claim 1,
the inner ring slip-off preventing portion is provided as a flange-like slip-off preventing portion disposed on a slip-off side of the flange portion.
3. The valve stem seal of claim 1,
the inner ring slip-off preventing portion is provided as a cylindrical slip-off preventing portion fitted in the cylindrical portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-079733 | 2020-04-28 | ||
| JP2020079733 | 2020-04-28 | ||
| PCT/JP2021/004719 WO2021220576A1 (en) | 2020-04-28 | 2021-02-09 | Valve stem seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114746678A true CN114746678A (en) | 2022-07-12 |
Family
ID=78331906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180006892.4A Pending CN114746678A (en) | 2020-04-28 | 2021-02-09 | Valve stem seal |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2021220576A1 (en) |
| CN (1) | CN114746678A (en) |
| WO (1) | WO2021220576A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3907001A1 (en) * | 1988-05-13 | 1989-11-23 | Goetze Ag | ASSEMBLY DEVICE FOR VALVE SPRING ADJUSTERS OF INTERNAL COMBUSTION ENGINES |
| JPH056109U (en) * | 1991-07-05 | 1993-01-29 | エヌオーケー株式会社 | Oil seal |
| US6901902B1 (en) * | 2004-02-25 | 2005-06-07 | Freudenberg-Nok General Partnership | Two-piece valve stem seal |
| US9500106B2 (en) * | 2009-05-20 | 2016-11-22 | Freudenberg—NOK General Partnership | Two-piece valve stem seal |
| US9416690B2 (en) * | 2009-07-30 | 2016-08-16 | Freudenberg-Nok General Partnership | Reduced inertia valve stem seal flange |
| US10557389B2 (en) * | 2018-04-04 | 2020-02-11 | Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. | Gasket for a valve of an internal combustion engine |
-
2021
- 2021-02-09 WO PCT/JP2021/004719 patent/WO2021220576A1/en active Application Filing
- 2021-02-09 JP JP2022518611A patent/JPWO2021220576A1/ja active Pending
- 2021-02-09 CN CN202180006892.4A patent/CN114746678A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021220576A1 (en) | 2021-11-04 |
| JPWO2021220576A1 (en) | 2021-11-04 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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