CN108301889A - Engine exhaust valve structure - Google Patents
Engine exhaust valve structure Download PDFInfo
- Publication number
- CN108301889A CN108301889A CN201810171972.5A CN201810171972A CN108301889A CN 108301889 A CN108301889 A CN 108301889A CN 201810171972 A CN201810171972 A CN 201810171972A CN 108301889 A CN108301889 A CN 108301889A
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- CN
- China
- Prior art keywords
- exhaust valve
- valve rod
- valve
- rod
- exhaust
- 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.)
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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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
-
- 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
- F01L3/24—Safety means or accessories, not provided for in preceding sub- groups of this group
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
A kind of engine exhaust valve structure, exhaust valve rod is passed through from valve seating and valve guide bushing from lower to upper, valve collet is installed on the top of exhaust valve rod, the outside installation spring seat of honour of valve collet, valve spring is sleeved on exhaust valve rod, it is equipped with valve lash adjusting screw in the top on exhaust valve rod top, the axial line of the valve lash adjusting screw and the axial line of exhaust valve rod are point-blank, end cap is set between valve lash adjusting screw and exhaust valve rod, the end cap is by the blind hole kink of its bottom end on exhaust valve rod, there is gap between the bottom surface and the end face on exhaust valve rod top of the blind hole.The present invention can make exhaust valve rod generate rotation because of engine luggine in the moment of exhaust valve closing, can effectively prevent exhaust valve rod hot-spot, exhaust valve rod is avoided to be burnt；Only the stress on its axial line, the abrasion between exhaust valve rod and valve guide bushing reduce, effectively prevent exhaust valve rod and be broken exhaust valve rod at work.
Description
Technical field
The invention belongs to technical field of engines, specifically, being related to a kind of engine exhaust valve structure.
Background technology
Exhaust valve rod is mounted in engine cylinder head, is play a part of to seal and control exhaust, is important on engine
Parts.The mounting means of existing exhaust valve rod is as shown in Fig. 2, valve guide bushing is installed at the middle part of accommodating hole 1a on cylinder head 1
2, valve seating 3 is installed in bottom, and exhaust valve rod 4 is passed through from valve seating 3 and valve guide bushing 2 from lower to upper, on the top of exhaust valve rod 4
End installation valve collet 5, the arc cam 5a of valve collet inner wall are caught on exhaust valve rod 4 in corresponding circular arc-shaped ring groove,
The outside pocketed springs seat of honour 6 of valve collet 5 is sleeved on 7 lower end of valve spring on exhaust valve rod 4 by 2 middle part of valve guide bushing
Annular convex platform limit, upper end is limited by the spring seat of honour 6.The valve lash adjusting screw 8 that control exhaust valve rod moves downward is pacified
On rocking arm 9, locked by nut 12.When cam pushes rocking arm 9 to rotate clockwise certain angle as shown in Figure 2 around rocker arm shaft 11
When, the valve lash adjusting screw 8 on rocking arm 9 depresses exhaust valve rod 4, makes exhaust valve rod 4 together with the spring seat of honour 6 relative to cylinder
First 1 moves downward, and valve spring 7 is compressed, and the conical surface of 4 bottom end of exhaust valve rod leaves valve seating 3, and exhaust valve is opened, engine
The exhaust gas that acting generates is discharged from exhaust valve；After the completion of exhaust, under the action of 7 elastic force of valve spring, exhaust valve rod 4 together with
The spring seat of honour 6 is moved upwards relative to cylinder head 1, so that the conical surface of 4 bottom end of exhaust valve rod is closed with valve seating seat, exhaust valve closing.
It since temperature is unbalanced when exhaust valve is vented, is easy to form " hot spot " at certain positions of valve seating 3,4 bottom end of exhaust valve rod cone
When continuously higher with temperature " hot spot " seat closes at the same position in face, " hot spot " just extends on valve-face, generation exhaust valve
The failures such as bar scaling loss.
To prevent exhaust valve rod conical surface hot-spot, exhaust valve rod from needing to rotate about the axis thereof automatically at work, arrange in this way
Repeatedly seat closes on the same hot spot of valve seating at valve stem conical surface neither one position, and the exhaust valve rod conical surface and valve seating are mutual
Wiping, helps to prevent combustion products from depositing, and improves heat transfer condition, is burnt to can avoid exhaust valve rod, improves sealing
Performance；Meanwhile exhaust valve rod rotation can also reduce the chance that the viscous long-pending object that its conical surface adheres to clings valve seating, ensure exhaust valve
What bar moved back and forth is smoothed out, and the temperature in exhaust valve rod bottom end tapering is made to tend to uniform.
As shown in Fig. 2, in the internal combustion engine of existing structure, the axial line of valve lash adjusting screw 8 and exhaust on rocking arm 9
There is a little offset between the axial line of door rod 4, about in 0.5mm or so, the pressure of valve lash adjusting screw 8 row each in this way
Valve stem 4, when making exhauxt valve opens, exhaust valve rod 4 can all occur slightly to rotate.The shortcomings that this structure is：
1, the bad control of offset between valve lash adjusting screw axial line and exhaust valve rod axial line, exhaust valve rod
Unobvious are rotated about the axis thereof at work, and still because of hot-spot scaling loss can occur for the exhaust valve rod conical surface.
2, there are offsets can lead to exhaust valve rod between valve lash adjusting screw axial line and exhaust valve rod axial line
By lateral pressure, offset is bigger, and the lateral pressure suffered by exhaust valve rod is bigger, so that between exhaust valve rod and valve guide bushing
The abrasion for generating bigger, can cause exhaust valve rod to be broken, so as to shorten its service life when serious.
Invention content
Technical problem to be solved by the present invention lies in a kind of engine exhaust valve structure is provided, to effectively prevent exhaust valve
Bar hot-spot reduces the abrasion between exhaust valve rod and valve guide bushing.
Technical scheme is as follows：A kind of engine exhaust valve structure, the middle part installation of accommodating hole on cylinder head
Valve seating is installed in valve guide bushing, bottom, and exhaust valve rod is passed through from valve seating and valve guide bushing from lower to upper, in exhaust valve rod
Valve collet is installed on top, the outside installation spring seat of honour of valve collet, be sleeved on valve spring upper end on exhaust valve rod by
The spring seat of honour limits, and lower end is limited by the annular convex platform in the middle part of valve guide bushing, and gas is equipped in the top on the exhaust valve rod top
Door gap adjustment screws, the valve lash adjusting screw are mounted on rocking arm, and key is：The valve lash adjusting screw
Axial line and exhaust valve rod axial line point-blank, end is set between valve lash adjusting screw and exhaust valve rod
Cap, the end cap by the blind hole kink of its bottom end on exhaust valve rod, the end face of the bottom surface and exhaust valve rod top of the blind hole
Between have gap.
Using above technical scheme, in the top kink end cap of exhaust valve rod, i.e., exhaust valve rod end and end cap blind hole it
Between be gap-matched, when cam pushes rocking arm to be rotated around rocker arm shaft, and the valve lash adjusting screw on rocking arm presses down, gas
Door gap adjustment screws are first pressed against end cap, and valve collet is made to do micro movement downwards relative to exhaust valve rod (because of valve collet
Arc cam on inner wall is more smaller than the circular arc-shaped ring groove on matched exhaust valve rod), subsequent valve collet and spring
Seat of honour compression valve spring, end cap are moved to the bottom surface contact exhaust valve rod end face of blind hole, push exhaust valve rod together on spring
Seat and valve collet move downward, and the conical surface of exhaust valve rod bottom end is made to leave valve seating, and exhaust valve is opened；It is shaken when cam acts on
After power on arm fades away, under the action of valve spring elastic force, exhaust valve rod is upward together with the spring seat of honour and valve collet
Movement makes the conical surface of exhaust valve rod bottom end be closed with valve seating seat, exhaust valve closing.In the moment of exhaust valve closing, due to end cap
There is gap, exhaust valve rod to be in free state, such engine between the bottom surface and the end face on exhaust valve rod top of upper blind hole
The vibration that operating generates will cause exhaust valve rod to rotate, and the rotating effect of exhaust valve rod is apparent, so as to effectively anti-
Only exhaust valve rod hot-spot improves heat transfer condition, avoids exhaust valve rod from being burnt, improve its sealing performance；Meanwhile between valve
Point-blank, compared with the background art, valve clearance is adjusted for the axial line of gap adjusting screw and the axial line of exhaust valve rod
When screw depresses exhaust valve rod every time, exhaust valve rod is the stress on its axial line, will not be again by lateral pressure, such exhaust valve
Abrasion between bar and valve guide bushing reduces, and the reciprocating motion of exhaust valve rod can be smoothed out, and effectively prevent exhaust valve rod
It is broken, substantially prolongs its service life.
Preferable scheme is that the bottom surface of above-mentioned end cap is contacted with the top surface of valve collet, the bottom surface of blind hole and row in end cap
Gap with 0.05-0.1mm between the end face on valve stem top.Gap mistake between blind hole bottom surface and exhaust valve rod top surface
Small, the bottom surface of end cap blind hole is contacted with exhaust valve rod always, is be easy to cause exhaust valve rod rotation unobvious or is turned motionless at all；It is blind
Gap between hole bottom surface and exhaust valve rod top surface is excessive, then end cap top surface contacted with valve lash adjusting screw, end cap bottom surface
It is contacted with valve collet, will also result in exhaust valve rod rotation unobvious or turns motionless at all.
Advantageous effect：The present invention can be such that exhaust valve rod generates because of engine luggine in the moment of exhaust valve closing to turn
Dynamic, the rotating effect of exhaust valve rod is apparent, can effectively prevent exhaust valve rod hot-spot, improves heat transfer condition, avoids exhaust valve
Bar is burnt, and improves its sealing performance；Exhaust valve rod at work only with valve lead on its axial line by stress, exhaust valve rod
Abrasion between pipe reduces, and the reciprocating motion of exhaust valve rod can be smoothed out, effectively prevent exhaust valve rod and be broken, greatly
Its service life is extended greatly.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of background technology.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples：
As shown in Figure 1, valve seating 3, valve are installed in the middle part installation valve guide bushing 2 of accommodating hole 1a, bottom on cylinder head 1
Conduit 2 and valve seating 3 with 1 tight fit of cylinder head.Exhaust valve rod 4 is passed through from valve seating 3 and valve guide bushing 2 from lower to upper,
Valve collet 5 is installed on the top of exhaust valve rod 4, the arc cam 5a of 5 inner wall of valve collet, which is caught on exhaust valve rod 4, to be corresponded to
Circular arc-shaped ring groove in, and arc cam 5a is more smaller than matched circular arc-shaped ring groove.It is set in the outside of valve collet 5
The spring seat of honour 6,7 upper end of valve spring being sleeved on exhaust valve rod 4 are limited by the spring seat of honour 6, and lower end is by 2 middle part of valve guide bushing
Annular convex platform limit.The valve lash adjusting screw 8 that control exhaust valve rod 4 moves downward is mounted on the end of rocking arm 9, by spiral shell
Mother 12 locks, and the middle part of rocking arm 9 is sleeved on rocker arm shaft 11, and rocking arm 9 can be rotated around rocker arm shaft 11.The valve clearance adjusts spiral shell
Point-blank with the axial line of exhaust valve rod 4, such exhaust valve rod 4 is at work only in its axle center for the axial line of nail 8
Stress on line, the abrasion between exhaust valve rod 4 and valve guide bushing 2 reduce, and the reciprocating motion of exhaust valve rod 4 can be smoothed out,
Exhaust valve rod 4 is effectively prevented to be broken.
It is further known that, end cap 10, the end cap are set between valve lash adjusting screw 8 and exhaust valve rod 4 from Fig. 1
10 by the blind hole kink of its bottom end on exhaust valve rod 4, i.e., clearance fit between end cap 10 and exhaust valve rod 4, end cap 10
Bottom surface is contacted with the top surface of valve collet 5, has gap in end cap 10 between the end face on 4 top of the bottom surface of blind hole and exhaust valve rod
The size of L, the gap L are 0.05-0.1mm.Gap L is too small, and the bottom surface of 10 blind hole of end cap is contacted with exhaust valve rod 4 always, holds
Exhaust valve rod 4 is easily caused to rotate unobvious or turn motionless at all；Gap L is excessive, then 10 top surface of end cap adjusts spiral shell with valve clearance
8 contact of nail, 10 bottom surface of end cap are contacted with valve collet 5, be will also result in exhaust valve rod rotation unobvious or are turned motionless at all.
Working principle of the present invention is as follows：When cam (not shown) pushes rocking arm 9 suitable as shown in Figure 1 around rocker arm shaft 11
Hour hands rotate, and when the valve lash adjusting screw 8 on rocking arm 9 being made to press down, valve lash adjusting screw 8 is first pressed against end cap
10, so that valve collet 5 is done micro movement, 6 compression valve of subsequent valve collet 5 and the spring seat of honour downwards relative to exhaust valve rod 4
Spring 7, end cap 10 are moved to bottom surface 4 end face of contact exhaust valve rod of blind hole, push exhaust valve rod 4 gentle together with the spring seat of honour 6
Grille clip 5 moves downward, and the conical surface of 4 bottom end of exhaust valve rod is made to leave valve seating 3, and exhaust valve is opened；When cam acts on rocking arm 9
On power disappear after, under the action of 7 elastic force of valve spring, exhaust valve rod 4 is transported upwards together with the spring seat of honour 6 and valve collet 5
It is dynamic, make 3 conjunctions of the conical surface and valve seating of 4 bottom end of exhaust valve rod, exhaust valve closing.In the moment of exhaust valve closing, due to end cap
There is on 10 between the end face on 4 top of the bottom surface of blind hole and exhaust valve rod gap, exhaust valve rod 4 to be in free state, send out in this way
The vibration that motivation operating generates will cause exhaust valve rod 4 to rotate, and to effectively prevent exhaust valve rod hot-spot, avoid exhaust valve
Bar is burnt.
Claims (1)
1. a kind of engine exhaust valve structure, the middle part installation valve guide bushing (2) of accommodating hole (1a), bottom on cylinder head (1)
Valve seating (3) is installed, exhaust valve rod (4) is passed through from valve seating (3) and valve guide bushing (2) from lower to upper, in exhaust valve rod (4)
Top installation valve collet (5), valve collet (5) outside installation the spring seat of honour (6), be sleeved on exhaust valve rod (4)
Valve spring (7) upper end is limited by the spring seat of honour (6), and lower end is limited by the annular convex platform in the middle part of valve guide bushing (2), in the row
The top on valve stem (4) top is equipped with valve lash adjusting screw (8), which is mounted on rocking arm (9)
On, it is characterised in that：The axial line of the valve lash adjusting screw (8) is with the axial line of exhaust valve rod (4) in straight line
On, end cap (10) is set between valve lash adjusting screw (8) and exhaust valve rod (4), which passes through its bottom end
Blind hole kink is on exhaust valve rod (4), and the bottom surface of the end cap (10) is contacted with the top surface of valve collet (5), in end cap (10)
Gap with 0.05-0.1mm between the bottom surface of blind hole and the end face on exhaust valve rod (4) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810171972.5A CN108301889A (en) | 2018-03-01 | 2018-03-01 | Engine exhaust valve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810171972.5A CN108301889A (en) | 2018-03-01 | 2018-03-01 | Engine exhaust valve structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108301889A true CN108301889A (en) | 2018-07-20 |
Family
ID=62849388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810171972.5A Withdrawn CN108301889A (en) | 2018-03-01 | 2018-03-01 | Engine exhaust valve structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108301889A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611172A (en) * | 2019-02-01 | 2019-04-12 | 中国科学院金属研究所 | A kind of long-life engine valve |
-
2018
- 2018-03-01 CN CN201810171972.5A patent/CN108301889A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611172A (en) * | 2019-02-01 | 2019-04-12 | 中国科学院金属研究所 | A kind of long-life engine valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180720 |