CN205189989U - Tapered engine valve structure in valve stem area - Google Patents
Tapered engine valve structure in valve stem area Download PDFInfo
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- CN205189989U CN205189989U CN201520978897.5U CN201520978897U CN205189989U CN 205189989 U CN205189989 U CN 205189989U CN 201520978897 U CN201520978897 U CN 201520978897U CN 205189989 U CN205189989 U CN 205189989U
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- valve
- valve stem
- truncated cones
- guide bushing
- stem
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Abstract
The utility model relates to a tapered engine valve structure in valve stem area, it includes the valve, valve guide and seat circle, spiracular valve stem runs through valve guide, the middle part of valve stem contains truncation circle conic section, the spiracular valve retainer of the truncation circle lower extreme that conic section is coaxial with the valve stem and the diameter is great orientation, truncation circle conic section's lower extreme diameter is greater than valve guide's internal diameter and the internal diameter that the upper end diameter is less than valve guide, closed with the whole careful sealing label of the round conic section's of truncation the conical surface in the interior drill way of valve guide lower extreme when valve retainer coordinated with a circle is sealed, valve guide's hole and valve stem left the clearance within a definite time when valve retainer and seat circle broke away from. This scheme has been solved among the prior art because the fit clearance between valve and seat circle results in the valve in the problem of closing the in -process slope.
Description
Technical field
The utility model relates to automotive engine valves, specifically a kind of engine valve structure of valve stem band tapering.
Background technique
The inlet and outlet door of motor car engine is the precision parts of canned motor suction port and relief opening, for controlling the air inlet of gas, the exchange process of exhaust in motor.They isolate the working space of sealing cylinder from the external world.Usually, valve and cylinder head top race form taper fit, reach the effect of sealed combustion chamber.The motion of valve is driven by driving mechanisms such as camshafts, and linear reciprocating motion under the leading role of valve guide bushing, realizes the opening and closing of valve.A kind of valve of motor disclosed in CN202673385U, this patent is improved traditional air valve structure, the frustoconical bevel angle in valve retainer conical surface portion is reduced to 20 °, when this kind of improvement makes valve work and the air valve seat ring conical surface normal force of colliding more reduce, simultaneously due to the reduction of normal force, the plastic deformation of the valve retainer conical surface also diminishes, and the slippage between valve and air valve seat ring also diminishes.
In order to ensure the motion of valve, be Spielpassung between valve guide bushing and valve, consider valve expand with heat and contract with cold effect and lubrication needs operationally, this gap is generally designed at about 0.03 ~ 0.07mm simultaneously.The existence of matching gap easily causes valve in closing process medium dip, causes air valve drop to be partially formed in a flash strong unbalance loading with seat ring and impacts, destroy the intensity of sealing area, and long-time so use exists the risk of seal failure.
Summary of the invention
The purpose of this utility model is the engine valve structure providing a kind of valve stem band tapering, and it can solve because the matching gap between valve and seat ring causes valve in the problem of closing process medium dip.
The technical solution of the utility model is as follows:
An engine valve structure for valve stem band tapering, comprises valve, valve guide bushing and seat ring, and the valve stem of valve runs through valve guide bushing.The middle part of valve stem comprises a truncated cones section, truncated cones section and lower end that diameter larger coaxial with valve stem is towards the valve retainer of valve, the lower end diameter of truncated cones section is greater than the internal diameter of valve guide bushing and upper end diameter is less than the internal diameter of valve guide bushing, when valve retainer coordinates with seat seal, the inner orifice of valve guide bushing lower end and the conical surface complete cycle of truncated cones section seal and fit, and leave gap when valve retainer and seat ring depart between the endoporus of valve guide bushing and valve stem.
Further, the part that described valve stem is positioned at below truncated cones section is equal with the lower end diameter of truncated cones section, and the part that valve stem is positioned at more than truncated cones section is equal with the upper end diameter of truncated cones section.
Further, the tapering of described truncated cones section is 1:50 ~ 1:150.
Further, the matching gap between described truncated cones section and valve guide bushing endoporus is-0.05 ~ 0.02mm, and the valve stem matching gap be positioned between the part of more than truncated cones section and valve guide bushing endoporus is 0.03 ~ 0.07mm.
Further, when described valve stem is positioned at lower limit position, the upper end of truncated cones section is concordant with the lower end of valve guide bushing.
This programme is designed to the form with tiny tapering by one of valve stem section; part with tapering is in the to-and-fro motion of valve guide bushing oral area; in valve-closing process; the matching gap of valve stem and valve guide bushing reduces gradually; produce the effect of automatic centering; reach the effect that valve valve stem in closing process does not tilt thus, thus impacting with the unbalance loading of seat ring in a flash of improving that valve retainer takes a seat, the sealing surface of protection valve retainer and seat ring.
Accompanying drawing explanation
Fig. 1 is the view of ideally air valve drop;
Fig. 2 is the view of air valve drop in prior art;
Fig. 3 is the mated condition schematic diagram of air valve drop moment valve retainer and seat ring in Fig. 2;
Fig. 4 is the view of the utility model when air valve drop;
Fig. 5 is the view of the utility model when valve opening.
Embodiment
Below in conjunction with drawings and Examples, the utility model will be further described.
An engine valve structure for valve stem band tapering, comprises the existing structure shown in Fig. 1: valve 1, valve guide bushing 2 and seat ring 3, and the valve stem of valve 1 runs through valve guide bushing 2.Realized the sealing process of engine chamber by the cooperation of valve 1 and seat ring 3, in the ideal situation, when valve 1 is taken a seat and closed, the ring surface forming a whole circle with seat ring 3 contacts existing valve 1 structure shown in Fig. 1.But there is matching gap between valve 1 and valve guide bushing 2, matching gap is generally designed to 0.03 ~ 0.07mm, when valve stem departs from valve guide bushing 2 run-off the straight, valve 1 takes a seat view instantaneously as shown in Figures 2 and 3.For statement needs, Fig. 2 and Fig. 3 is only structural schematic diagram.Contacted by origination point in the moment that valve 1 is taken a seat, this point of contact 4 is the Contact-impact point of valve 1 and seat ring 3, and valve 1 is taken a seat moment, and point of contact 4 will bear higher impulsive load.And the opposite side 5 of valve retainer 9 does not now contact with seat ring 3, withstand shocks load hardly.Along with the increase of engine on time, due to the difference of stressing conditions, the wear extent of seat ring 3 is more and more uneven, finally brings the risk of seal failure between valve 1 and seat ring 3.
Cone structure of the present utility model is the problem in order to avoid valve stem departs from, specifically the middle part of valve stem is designed to a truncated cones section 6, truncated cones section 6 and lower end that diameter larger coaxial with valve stem is towards the valve retainer 9 of valve 1, the lower end diameter of truncated cones section 6 is greater than the internal diameter of valve guide bushing 2 and upper end diameter is less than the internal diameter of valve guide bushing 2, when valve retainer 9 and seat ring 3 are sealed and matched, the inner orifice of valve guide bushing 2 lower end and the conical surface complete cycle of truncated cones section 6 seal and fit, gap is left between the endoporus of valve guide bushing 2 and valve stem when valve retainer 9 and seat ring 3 depart from.Due to the existence of truncated cones section 6, valve 1 is in the process of taking a seat, and the matching gap cone angle between valve stem and valve guide bushing 2 reduces, and forms automatic centering effect, thus ensure that valve 1 realizes even contact at take a seat valve retainer 9 and seat ring 3 instantaneously.Valve stem is under the leading role of valve guide bushing 2, and upper and lower straight line motion, can reach more satisfactory state when valve 1 is taken a seat, as shown in Figure 4.Improve seat ring 3 to wear and tear uneven phenomenon, can ensure that valve 1 and seat ring 3 have good sealability for a long time.
The part 7 that described valve stem is positioned at truncated cones section less than 6 is equal with the lower end diameter of truncated cones section 6, the part 8 that valve stem is positioned at truncated cones section more than 6 is equal with the upper end diameter of truncated cones section 6, make valve stem lower half portion more bigger than the diameter of valve stem upper half part, the whole bar portion even transition of valve stem.
The taper design of the truncated cones section 6 of valve stem is 1:50 ~ 1:150.
Matching gap between described truncated cones section 6 and valve guide bushing 2 endoporus is-0.05 ~ 0.02mm, and the valve stem matching gap be positioned between the part 8 of truncated cones section more than 6 and valve guide bushing 2 endoporus is 0.03 ~ 0.07mm.When described valve stem is positioned at lower limit position, the upper end of truncated cones section 6 is concordant with the lower end of valve guide bushing 2, namely be that the valve stem part 8 of truncated cones section more than 6 has one section can stretch in valve guide bushing 2, as shown in Figure 5, matching gap and the existing conventional design of this part valve stem and valve guide bushing 2 are consistent, namely recommend employing 0.03 ~ 0.07mm, ensure effective motion guide.
Claims (5)
1. the engine valve structure of a valve stem band tapering, comprise valve, valve guide bushing and seat ring, the valve stem of valve runs through valve guide bushing, it is characterized in that: the middle part of valve stem comprises a truncated cones section, truncated cones section and lower end that diameter larger coaxial with valve stem is towards the valve retainer of valve, the lower end diameter of truncated cones section is greater than the internal diameter of valve guide bushing and upper end diameter is less than the internal diameter of valve guide bushing, when valve retainer coordinates with seat seal, the inner orifice of valve guide bushing lower end and the conical surface complete cycle of truncated cones section seal and fit, gap is left between the endoporus of valve guide bushing and valve stem when valve retainer and seat ring depart from.
2. the engine valve structure of a kind of valve stem band tapering according to claim 1, it is characterized in that: the part that described valve stem is positioned at below truncated cones section is equal with the lower end diameter of truncated cones section, the part that valve stem is positioned at more than truncated cones section is equal with the upper end diameter of truncated cones section.
3. the engine valve structure of a kind of valve stem band tapering according to claim 1 and 2, is characterized in that: the tapering of described truncated cones section is 1:50 ~ 1:150.
4. the engine valve structure of a kind of valve stem band tapering according to claim 3, it is characterized in that: the matching gap between described truncated cones section and valve guide bushing endoporus is-0.05 ~ 0.02mm, the valve stem matching gap be positioned between the part of more than truncated cones section and valve guide bushing endoporus is 0.03 ~ 0.07mm.
5. the engine valve structure of a kind of valve stem band tapering according to any one of claim 1,2,4, is characterized in that: when described valve stem is positioned at lower limit position, the upper end of truncated cones section is concordant with the lower end of valve guide bushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520978897.5U CN205189989U (en) | 2015-12-01 | 2015-12-01 | Tapered engine valve structure in valve stem area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520978897.5U CN205189989U (en) | 2015-12-01 | 2015-12-01 | Tapered engine valve structure in valve stem area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205189989U true CN205189989U (en) | 2016-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520978897.5U Active CN205189989U (en) | 2015-12-01 | 2015-12-01 | Tapered engine valve structure in valve stem area |
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| Country | Link |
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| CN (1) | CN205189989U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796848A (en) * | 2021-01-08 | 2021-05-14 | 太原理工大学 | Novel double-rocker four-valve mechanism of single-cylinder diesel engine |
| CN114109552A (en) * | 2021-12-15 | 2022-03-01 | 镇江维纳特气门科技有限公司 | Internal combustion engine intake valve convenient to adjust |
-
2015
- 2015-12-01 CN CN201520978897.5U patent/CN205189989U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796848A (en) * | 2021-01-08 | 2021-05-14 | 太原理工大学 | Novel double-rocker four-valve mechanism of single-cylinder diesel engine |
| CN114109552A (en) * | 2021-12-15 | 2022-03-01 | 镇江维纳特气门科技有限公司 | Internal combustion engine intake valve convenient to adjust |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |