CN103883373A - Valve guide pipe and manufacturing method thereof - Google Patents
Valve guide pipe and manufacturing method thereof Download PDFInfo
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- CN103883373A CN103883373A CN201410118956.1A CN201410118956A CN103883373A CN 103883373 A CN103883373 A CN 103883373A CN 201410118956 A CN201410118956 A CN 201410118956A CN 103883373 A CN103883373 A CN 103883373A
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- valve guide
- high temperature
- temperature resistant
- guide bushing
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Abstract
The invention discloses a valve guide pipe matched with a valve rod. The valve guide pipe comprises a valve guide pipe body and a porous high temperature resistant insert which is inserted into the inner wall of the valve guide pipe body. The porous high temperature resistant insert and the valve guide pipe body form an inner cylindrical surface matched with the valve rod in a clearance mode. A large amount of machine oil can be stored in air holes of the porous high temperature resistant insert, the porous high temperature resistant insert can move up and down in a reciprocating mode along with a valve in the using process, the machine oil can form an appropriate oil film between the valve rod and the valve guide pipe body, and therefore the lubrication performance is guaranteed; in addition, the machine oil can be prevented from leaking into a combustion chamber due to the oil film, consumption of the machine oil is reduced, and the discharge performance of the complete machine is optimized. In addition, the porous high temperature resistant insert has the high temperature resistance, the porous high temperature resistant insert can be pre-buried into a casting sand mold and reliably inserted into the valve guide pipe body through iron liquid casting and solidification, and the good machining technology is achieved. Based on the valve guide pipe, the invention further provides a manufacturing method of the valve guide pipe.
Description
Technical field
The present invention relates to engine component processing technique field, be specifically related to a kind of valve guide bushing and manufacture method thereof.
Background technique
As everyone knows, distribution device is one of important component part of motor, and in working procedure, the major function of distribution device is the inlet and outlet door that opens and closes automatically each cylinder according to a specified time.Its effect is that air is supplied with inflammable mixture (petrol engine) or fresh air (diesel engine) by intake valve in time in cylinder, and in time the waste gas forming after work by combustion is discharged from exhaust valve, realize the whole process of cylinder ventilation supply.
Wherein, valve stem is done straight reciprocating motion in valve guide bushing, and the lubricant oil that splashes out by distribution device is between the two lubricated, and can guarantee valve stem action displacement reliably on the one hand, and the heat of valve stem is passed to cylinder head via valve guide bushing simultaneously.In practical work process, lubricants capacity is excessive to be easy to infiltrate cylinder and to form burning particles discharge, therefore need to control lubricants capacity, and the control of lubricants capacity will directly have influence on its lubricating condition conversely.
Based on the restriction of particulate emission index, can be by the self lubricity of lifting valve guide bushing to obtain good wear-resisting property.Traditional valve guide bushing adopts cast iron materials, in gray cast iron, the graphite of high level in use provides certain self-lubricating function, because its effect is limited, be easy to occur engine valve guide bush and valve stem bonding fault, cause valve fracture, push rod bending, serious meeting causes piston scraping, connecting rod cracking, even smashes the problems such as cylinder.
For reduce valve guide bushing and valve stem occur bonding fault may, prior art has proposed a kind of design, at valve guide bushing cylinder inwall, some circular grooves is set, can oil storage in circular groove, thereby improve its self lubricity.But, being subject to the restriction of himself structure, valve stem and valve guide bushing Contact area reduce, easily make valve guide bushing wearing and tearing aggravation, increase from valve guide bushing and valve stem clearance, make to infiltrate firing chamber inner engine oil and increase, final oil consumption raises, and causes deterioration of emission.In addition, larger with the valve guide bushing difficulty of processing of circular groove.
In view of this, urgently look for another way and improve design for valve guide bushing, promoting on its self-lubricating property basis, obtain preferably technology capability.
Summary of the invention
For above-mentioned defect, the technical problem that the present invention solves is to provide a kind of valve guide bushing of structure optimization so that valve guide bushing possesses the self lubricity of high-quality, reduce to greatest extent frictional work, there is good technology capability simultaneously.On this basis, the present invention also provides a kind of manufacture method of this valve guide bushing.
Valve guide bushing provided by the invention, for suitable with valve stem; Comprise valve guide bushing body and the high temperature resistant inserts of porous that is flush-mounted in described valve guide bushing inner body wall, and the high temperature resistant inserts of described porous forms with described valve guide bushing body the inner periphery coordinating with described valve stem clearance.
Preferably, the high temperature resistant inserts of described porous adopts porous ceramics to make.
Preferably, the high temperature resistant inserts entirety of described porous is circular.
Preferably, the circular high temperature resistant inserts of described porous is at least two that axially spaced-apart arranges, and is provided with the high temperature resistant inserts of described porous in the both sides of nearly described valve guide bushing axial end.
Preferably, the high temperature resistant inserts entirety of described porous in the shape of a spiral.
Preferably, the gap of described Spielpassung is less than 0.15mm.
Preferably, in the axial cross section of the high temperature resistant inserts of described porous, there is body shaft from the high temperature resistant inserts of described porous to the limited part stretching out.
Preferably, in the axial cross section of the high temperature resistant inserts of described porous, its outboard end has the boss that stretch out axial both sides.
The manufacture method of aforementioned valve guide bushing provided by the invention, carry out in the steps below:
A. determine the high temperature resistant inserts of described porous according to the size of described valve guide bushing;
B. high temperature resistant described porous inserts is placed in to the casting sand type of described valve guide bushing;
C. the melt and dissolved molten iron of casting;
D. the endoporus of the described valve guide bushing of cooling rear processing, makes the high temperature resistant inserts of described porous form with described valve guide bushing body the inner periphery coordinating with described valve stem clearance.
Preferably, the core of described casting sand type and outside dimension suitable section of the high temperature resistant inserts of described porous, be greater than the outside dimension of other core sections.
Compared with prior art, the present invention is embedded with the high temperature resistant inserts of porous in valve guide bushing inner body wall, and this porous is high temperature resistant, and inserts forms with valve guide bushing body the inner periphery coordinating with valve stem clearance.So arrange, the pore of the high temperature resistant inserts of porous can store a large amount of machine oil, in using process along with valve pumps, machine oil can form suitable oil film between valve stem and valve guide bushing, thereby guarantee greasy property, reduce frictional work, fundamentally solved the problems such as valve guide bushing and valve stem adhesion, wearing and tearing; In addition, the formation of this oil film can also can stop the machine oil firing chamber of bleeding simultaneously, thereby reduces consumption of lubricating oil, can effectively evade pm emission pollutant after machine oil burning, optimizes complete machine emission performance.In addition, porous is high temperature resistant, and inserts has high-temperature stability, therefore this inserts can be embedded in casting sand mold, cast and solidify by iron liquid, the high temperature resistant inserts of this porous is embedded in the cast iron body of valve guide bushing reliably, simplify course of working, there is good processing technology.
In preferred version of the present invention, in the axial cross section of the high temperature resistant inserts of this porous, there is body shaft from the high temperature resistant inserts of porous to the limited part stretching out; Like this, can prevent that it from occurring rocking at the radial and axial body with respect to valve guide bushing, make the high temperature resistant inserts of porous connect more reliably in valve guide bushing body, and then improve its working stability.
Valve guide bushing provided by the invention can be set up good coordinating with the valve stem of petrol engine or diesel engine, and the applying working condition of applicable any type of engine.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of valve guide bushing described in the first embodiment;
Fig. 2 is the overall structure schematic diagram of the high temperature resistant inserts of porous described in the first embodiment;
Fig. 3 is the structural representation of cooled semi-finished product valve guide bushing of casting described in present embodiment;
Fig. 4 is the axial cross section schematic diagram of the high temperature resistant inserts of porous shown in the second embodiment;
Fig. 5 is the axial cross section schematic diagram of the high temperature resistant inserts of porous shown in the 3rd embodiment.
In Fig. 1-Fig. 5:
Valve guide bushing body 1, interior perimeter surface 11, porous is high temperature resistant inserts 2, boss 21, interior perimeter surface 22;
Porous is high temperature resistant inserts 2', limited part 21';
Porous is high temperature resistant inserts 2 ", limited part 21 ".
Embodiment
Core of the present invention be to provide a kind of for the suitable valve guide bushing of valve stem, by the configuration of the high temperature resistant inserts of porous, can guarantee the self lubricity of valve guide bushing, there is good technology capability simultaneously.Illustrate present embodiment below in conjunction with Figure of description.
Embodiment 1:
Refer to Fig. 1, this figure is the overall structure schematic diagram of valve guide bushing described in the first embodiment, for the clear core design that this programme is shown, this figure is axially to analyse and observe the working state schematic representation of measuring the cubing of valve seat conical surface height described in present embodiment, and this figure is the form performance of axially analysing and observe.
This valve guide bushing is made up of two major components: valve guide bushing body 1 and the high temperature resistant inserts 2 of porous that is flush-mounted in this valve guide bushing body 1 inwall, and the high temperature resistant inserts 2 of porous forms with valve guide bushing body 1 and the inner periphery of valve stem (not shown) Spielpassung; That is to say, the interior perimeter surface 22 of inserts 2 that porous is high temperature resistant is identical with interior perimeter surface 11 diameters of valve guide bushing body 1, jointly forms the inner periphery of valve guide bushing, and in working procedure, the two works simultaneously.Particularly, the pore of porous is high temperature resistant inserts 2 can store a large amount of machine oil, in using process along with valve pumps, machine oil can form suitable oil film between valve stem and valve guide bushing, thereby guarantee greasy property, meanwhile, the formation of this oil film can also stop the machine oil firing chamber of bleeding.
In this programme, porous is high temperature resistant, and inserts 2 adopts silicon carbide (SiC) to make, and it is circular that entirety is; Please also refer to Fig. 2, the figure shows the overall structure schematic diagram of the high temperature resistant inserts 2 of porous shown in Fig. 1.Silicon carbide (SiC) is a kind of Inorganic Non-metallic Materials, there is high hardness, high wear resistance, friction factor is low, thermal expansion coefficient is low and the good characteristic such as resistance to chemical attack, so arrange, circular porous is high temperature resistant inserts 2 is except providing storage area for lubricant oil, it has higher wear resistance can play good wear-resisting effect, can avoid because wearing and tearing cause the excessive possibility that causes machine oil to bleed firing chamber of matching gap; Valve guide bushing body 1 adopts cast iron materials, suitable with the valve guide bushing body 1 playing the guiding role, and obtains best work and enables.
Wherein, the material of porous is high temperature resistant inserts 2 is selected to be not limited to and is adopted silicon carbide (SiC), for example, and stupalith etc.; As long as should be appreciated that meet porous, the aforementioned function needs such as high temperature resistant all can.
Based on the high-temperature stability of silicon carbide (SiC), this valve guide bushing can be embedded into high temperature resistant porous inserts 2 in the casting sand type of described valve guide bushing, is cast and is solidified by iron liquid, and high temperature resistant porous inserts 2 is embedded in valve guide bushing body 1 reliably.
The manufacture method of this valve guide bushing of brief description below, specifically carry out in the steps below:
First, determine the high temperature resistant inserts 2 of SiC porous according to the size of valve guide bushing; For valve guide bushing, can determine that the high temperature resistant inserts 2 of SiC porous of corresponding size is to be flush-mounted in valve guide bushing body 1.
Then, high temperature resistant SiC porous inserts 2 is placed in to the casting sand type of valve guide bushing, shown in figure, is provided with the high temperature resistant inserts 2 of porous in the both sides axial end of nearly valve guide bushing; That is to say, high temperature resistant the SiC porous of certain size inserts 2 is fixed in casting system, and core plays the effect of moulding and the high temperature resistant inserts 2 of fixing SiC porous.
Next, the melt and dissolved molten iron of casting.Because the fusing point of SiC material is up to 3500 ℃, and thermal expansion coefficient is little; And molten iron temperature is only 1400 ℃ of left and right, before and after cast molding, the high temperature resistant inserts 2 of SiC porous is unchanged.
Finally, the endoporus of cooling rear processing valve guide bushing, makes the high temperature resistant inserts 2 of porous form with valve guide bushing body 1 inner periphery coordinating with valve stem clearance; In order to obtain good formation oil film, the size of inner periphery preferably meets matching gap and is less than 0.15mm.So far complete the processing of valve guide bushing.
In order to ensure the quality of fit between valve guide bushing and valve stem, be convenient to carry out the processing of interior cylinder matching surface, can do further to optimize to the core internal diameter of casting sand type, the core 3 of casting sand type and outside dimension D suitable section of the high temperature resistant inserts 2 of porous, be greater than the outside dimension d of other core sections, the structural representation of the cooled semi-finished product valve guide bushing of casting.So setting, removes processing by cast iron materials more than needed in casting blank, concordant with the interior perimeter surface of the high temperature resistant inserts 2 of SiC porous to the cast iron of valve guide bushing body 1, and reduces the surface roughness of cast iron.Specifically as shown in Figure 2.
It should be noted that, circular porous is high temperature resistant, and inserts 2 is not limited to two shown in figure, according to the size of actual valve conduit and manufacture cost, can be set to one, or other are a plurality of for spaced vertically.
In addition,, except circular, porous is high temperature resistant inserts also can entirety (not shown) in the shape of a spiral, obtains better self-lubricating effect; Certainly, than the high temperature resistant inserts of circular porous, the difficulty of processing of the high temperature resistant inserts of helical porous is larger, therefore the high temperature resistant inserts 2 of circular porous is optimal case.
In this programme, in the axial cross section of porous is high temperature resistant inserts 2, its outboard end has the boss 21 stretching out axial both sides, can make the high temperature resistant inserts 2 of porous connect more reliably valve guide bushing body 1 is interior.Here, boss 21 is for preventing that it is at the radial and axial limited part that rocks of occurring with respect to valve guide bushing body 1, and the function based on limited part needs, and can also adopt other structural types; As long as this design concept of application: in the axial cross section of the high temperature resistant inserts of porous, there is body shaft from the high temperature resistant inserts of porous to the limited part stretching out, in the scope of all protecting in the application's request.The for example high temperature resistant inserts of porous shown in following two embodiments.
Embodiment 2:
Refer to Fig. 4, this figure is the axial cross section schematic diagram of the high temperature resistant inserts of porous shown in the second embodiment.
Compared with the first embodiment, described in this programme, the high temperature resistant inserts 2' of porous is also circular, difference is only, described in this programme, the high temperature resistant inserts 2' of porous adopts silicon nitride class porous ceramic film material to make, its limited part 21' has adopted different structures, as shown in Figure 4, and in its axial cross section, this limited part 21' successively decreases and extends to form to both sides size from the body shaft of the high temperature resistant inserts 2' of porous, substantially triangular in shape.
Embodiment 3:
Refer to Fig. 5, this figure is the axial cross section schematic diagram of the high temperature resistant inserts of porous shown in the 3rd embodiment.
" be also circular, difference is only, the high temperature resistant inserts 2 of porous " adopts alumina type porous ceramics to make, its limited part 21 " magnitude setting difference described in this programme for compared with first and second embodiment, the high temperature resistant inserts 2 of porous described in this programme.As shown in Figure 5, in its axial cross section, two boss that the body shaft of this limited part 21 " from the high temperature resistant inserts 2 of porous " is stretched out to both sides.
Identical with the first embodiment, the high temperature resistant inserts of porous can be embedded in the casting sand type of described valve guide bushing equally described in second and third embodiment, is cast and is solidified by iron liquid.Do not repeat them here.
In addition it should be noted that, except silicon carbide, silicon nitride and alumina type porous ceramics, porous is high temperature resistant, and inserts can also adopt aluminium nitride class porous ceramics to make.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a valve guide bushing, for suitable with valve stem; It is characterized in that, comprising:
Valve guide bushing body; With
Porous is high temperature resistant inserts, be flush-mounted in the inwall of described valve guide bushing body, and the high temperature resistant inserts of described porous forms with described valve guide bushing body the inner periphery coordinating with described valve stem clearance.
2. valve guide bushing according to claim 1, is characterized in that, described porous is high temperature resistant, and inserts adopts porous ceramics to make.
3. valve guide bushing according to claim 2, is characterized in that, described porous is high temperature resistant, and inserts entirety is circular.
4. valve guide bushing according to claim 3, is characterized in that, the circular high temperature resistant inserts of described porous is at least two that axially spaced-apart arranges, and is provided with the high temperature resistant inserts of described porous in the both sides of nearly described valve guide bushing axial end.
5. valve guide bushing according to claim 2, is characterized in that, inserts entirety that described porous is high temperature resistant in the shape of a spiral.
6. according to the valve guide bushing described in any one in claim 1 to 5, it is characterized in that, the gap of described Spielpassung is less than 0.15mm.
7. according to the valve guide bushing described in any one in claim 1 to 5, it is characterized in that, in the axial cross section of the high temperature resistant inserts of described porous, thering is body shaft from the high temperature resistant inserts of described porous to the limited part stretching out.
8. valve guide bushing according to claim 7, is characterized in that, in the axial cross section of the high temperature resistant inserts of described porous, its outboard end has the boss that stretch out axial both sides.
9. the manufacture method of valve guide bushing as described in any one in claim 1 to 8, is characterized in that, this manufacture method is carried out in the steps below:
A. determine the high temperature resistant inserts of described porous according to the size of described valve guide bushing;
B. high temperature resistant described porous inserts is placed in to the casting sand type of described valve guide bushing;
C. the melt and dissolved molten iron of casting;
D. the endoporus of the described valve guide bushing of cooling rear processing, makes the high temperature resistant inserts of described porous form with described valve guide bushing body the inner periphery coordinating with described valve stem clearance.
10. the manufacture method of valve guide bushing according to claim 9, is characterized in that, the core of described casting sand type and outside dimension suitable section of the high temperature resistant inserts of described porous are greater than the outside dimension of other core sections.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410118956.1A CN103883373B (en) | 2014-03-27 | 2014-03-27 | Valve guide pipe and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410118956.1A CN103883373B (en) | 2014-03-27 | 2014-03-27 | Valve guide pipe and manufacturing method thereof |
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| CN103883373A true CN103883373A (en) | 2014-06-25 |
| CN103883373B CN103883373B (en) | 2017-01-18 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353859A (en) * | 2014-10-29 | 2015-02-18 | 济南鑫杰机械制造有限公司 | Fixing part for drilling of liner plate |
| CN105081225A (en) * | 2015-08-28 | 2015-11-25 | 台州日井泵业有限公司 | Assembly method of runner insert in water pump head |
| EP3040526A1 (en) * | 2014-12-30 | 2016-07-06 | General Electric Company | Multi-material valve guide system and method |
| CN107842405A (en) * | 2017-10-27 | 2018-03-27 | 江苏金山动力科技有限公司 | Easy-to-mount valve guide bushing |
| CN112627927A (en) * | 2019-09-24 | 2021-04-09 | 上海汽车集团股份有限公司 | Engine valve guide pipe and machining method thereof |
| CN113878106A (en) * | 2021-09-27 | 2022-01-04 | 上海宝钢铸造有限公司 | Sand-catching baffle type cooling pipe and molding method thereof |
| CN114033523A (en) * | 2021-10-31 | 2022-02-11 | 东风商用车有限公司 | Air valve guide pipe of engine and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353859A (en) * | 2014-10-29 | 2015-02-18 | 济南鑫杰机械制造有限公司 | Fixing part for drilling of liner plate |
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| CN105081225A (en) * | 2015-08-28 | 2015-11-25 | 台州日井泵业有限公司 | Assembly method of runner insert in water pump head |
| CN107842405A (en) * | 2017-10-27 | 2018-03-27 | 江苏金山动力科技有限公司 | Easy-to-mount valve guide bushing |
| CN112627927A (en) * | 2019-09-24 | 2021-04-09 | 上海汽车集团股份有限公司 | Engine valve guide pipe and machining method thereof |
| CN113878106A (en) * | 2021-09-27 | 2022-01-04 | 上海宝钢铸造有限公司 | Sand-catching baffle type cooling pipe and molding method thereof |
| CN114033523A (en) * | 2021-10-31 | 2022-02-11 | 东风商用车有限公司 | Air valve guide pipe of engine and manufacturing method thereof |
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|---|---|
| CN103883373B (en) | 2017-01-18 |
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