CN107237709B - High-power diesel engine fuel cam and its design method - Google Patents
High-power diesel engine fuel cam and its design method Download PDFInfo
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- CN107237709B CN107237709B CN201710479477.6A CN201710479477A CN107237709B CN 107237709 B CN107237709 B CN 107237709B CN 201710479477 A CN201710479477 A CN 201710479477A CN 107237709 B CN107237709 B CN 107237709B
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- Prior art keywords
- cam
- radius
- idler wheel
- contact stress
- fuel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a kind of high-power diesel engine fuel cam and design method, each factor meetsRelationship.Under prescribed conditions, according to certain correlation, system, the structural parameters for reasonably having selected high-power diesel engine fuel cam, fuel cam is effectively guaranteed with enough stiffness and strength to bear its contact stress between roller for fuel injection pump, velocity of plunger is improved, the requirement of high-power diesel engine high compression ratio, high injection pressure and more maximum discharge grade is met；Enormously simplify the selection course of fuel cam design parameter.
Description
Technical field
The present invention relates to Diesel Engine Technique Fields, and in particular to a kind of high-power diesel engine fuel cam and its design side
Method.
Background technique
Fuel cam is the important component of diesel engine.Combustion position in cylinder of diesel engine includes burning opportunity and heat release rule
Rule, is heavily dependent on the molded line of fuel cam.The major parameter of fuel cam molded line includes: base radius, most rises higher
Journey, molded line shape etc..With diesel engine power continually strengthen and continuous improvement of the environment to emission request, improve fuel oil
Spraying pressure is always to improve one of the main path of diesel engine performance.And the raising of fuel-injection pressure, it is convex to will lead to fuel feeding
Contact stress between wheel and roller for fuel injection pump is higher and higher.If the base radius and roller for fuel injection pump speed mistake of fuel cam
Small, it is excessive and damage the type face of cam roller to will lead to the contact stress between cam and idler wheel, and the velocity of plunger of injection pump
It does not reach requirement yet.Therefore, for guarantee fuel cam there are enough stiffness and strength to bear it between roller for fuel injection pump
Contact stress, it is more as big as possible to always want to its base radius in design, but this will receive diesel engine general layout again
The limitation of the factors of condition.The way of the prior art is typically all repeatedly to choose by rule of thumb not referring to existing similar type
Same fuel feeding base radius, is repeated the checking computations of contact stress and installation site size.
Summary of the invention
The object of the invention is to overcome the deficiency of the above-mentioned prior art, provide a kind of high-power diesel engine fuel cam and
Its design method.
The technical scheme adopted by the invention is that a kind of design method of high-power diesel engine fuel cam, feature exist
In satisfaction
Relationship determine each factor of fuel cam, in formula: R0: radius of cam base-circle；V: contact stress maximum rolling
Wheel speed；FT: the resultant force of plunger force and spring force；Rc: contact stress maximum cam contact radius；Rf: roller radius；Sc: it connects
Touch stress；L: roller widths；μc: cam material Poisson's ratio；μr: idler wheel material Poisson's ratio；Ec: cam material elasticity modulus；Er:
Idler wheel material elasticity modulus；hi: contact stress maximum idler wheel lift；hmax: idler wheel maximum lift；Lh: camshaft is in body chamber
Minimum revolution distance；Z: the axial gap of camshaft；M: the gap of cam type surface and body；hc: the initial locating distance of injection pump
From；C: fuel injection pump body height；E: fitting body height；H: fuel filler height on camshaft distance of shaft centers cylinder head；R: high-pressure oil pipe
Elbow radius；F: the thread depth of oil spout oil pump outlet valve interface；
A kind of high-power diesel engine fuel cam, it is characterised in that its each factor meets
Relationship, in formula: R0: radius of cam base-circle；V: contact stress maximum wheel speeds；FT: plunger force and spring force
Resultant force；Rc: contact stress maximum cam contact radius；Rf: roller radius；Sc: contact stress；L: roller widths；μc: it is convex
Take turns material Poisson's ratio；μr: idler wheel material Poisson's ratio；Ec: cam material elasticity modulus；Er: idler wheel material elasticity modulus；hi: contact
Stress maximum idler wheel lift；hmax: idler wheel maximum lift；Lh: minimum revolution distance of the camshaft in body chamber；Z: camshaft
Axial gap；M: the gap of cam type surface and body；hc: the initial mounting distance of injection pump；C: fuel injection pump body height；E: high
Pressure oil union body height；H: fuel filler height on camshaft distance of shaft centers cylinder head；R: high-pressure oil pipe elbow radius；F: injection pump
The thread depth of delivery valve interface.
The beneficial effects of the present invention are: under prescribed conditions, according to certain correlation, system reasonably selects big function
The structural parameters of rate Fuel Injection Mechanism of Diesel Engine cam, be effectively guaranteed fuel cam with enough stiffness and strength come bear its with
Contact stress between roller for fuel injection pump, improves velocity of plunger, meets high-power diesel engine high compression ratio, high injection pressure
And the requirement of more maximum discharge grade；Enormously simplify the selection course of fuel cam design parameter.
Detailed description of the invention
Fig. 1 is the fuel cam schematic view of the mounting position of the embodiment of the present invention.
In the figure, it is marked as fuel inlet on 1- cylinder head；2- block upper surface；3- cushion block；4- camshaft center.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiment in invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
1. determining fuel cam base radius lower limit value
Fuel cam base radius lower limit value should meet following formula
Each parameter listed by table 1 is provided as injection pump supplier:
Table 1
It brings each parameter listed by table 1 into formula (1), obtains R0 >=62.81mm, i.e. fuel cam base radius lower limit value.
2. determining fuel cam base radius upper limit value
Fuel cam base radius upper limit value should meet following formula
R0≤min[(Lh+M-Z-hmax), (H-R-F-hc- C-E)] formula (2)
According to the requirement of general layout in design, there is each parameter listed by table 2:
Table 2
It brings each parameter listed by table 2 into formula (2), obtains R0≤ 82.5mm, i.e. fuel cam base radius upper limit value.
3. choosing the practical adopted value of fuel cam base radius
In 62.81mm≤R0In the range of≤82.5mm, the selection practical adopted value of fuel cam base radius is 80mm.Most
The fuel cam critical data such as the following table 3 designed eventually:
Table 3
By data in table as it can be seen that the Max.contact stress between cam and idler wheel is 1801.4084N/mm2, less than being advised in table 1
Fixed limits value 1900N/mm2, therefore design rationally and meet the requirements.
Claims (2)
1. a kind of design method of high-power diesel engine fuel cam, it is characterised in that meet
Relationship determine each factor of fuel cam, in formula: R0: radius of cam base-circle；V: contact stress maximum wheel speeds；FT:
The resultant force of plunger force and spring force；Rc: contact stress maximum cam contact radius；Rf: roller radius；Sc: contact stress；L:
Roller widths；μc: cam material Poisson's ratio；μr: idler wheel material Poisson's ratio；Ec: cam material elasticity modulus；Er: idler wheel material bullet
Property modulus；hi: contact stress maximum idler wheel lift；hmax: idler wheel maximum lift；Lh: minimum revolution of the camshaft in body chamber
Distance；Z: the axial gap of camshaft；M: the gap of cam type surface and body；hc: the initial mounting distance of injection pump；C: injection pump
Upper body height；E: fitting body height；H: fuel filler height on camshaft distance of shaft centers cylinder head；R: high-pressure oil pipe elbow radius；F:
The thread depth of oil spout oil pump outlet valve interface.
2. a kind of high-power diesel engine fuel cam, it is characterised in that its each factor meets
Relationship, in formula: R0: radius of cam base-circle；V: contact stress maximum wheel speeds；FT: the resultant force of plunger force and spring force；
Rc: contact stress maximum cam contact radius；Rf: roller radius；Sc: contact stress；L: roller widths；μc: cam material pool
Loose ratio；μr: idler wheel material Poisson's ratio；Ec: cam material elasticity modulus；Er: idler wheel material elasticity modulus；hi: contact stress is maximum
Idler wheel lift；hmax: idler wheel maximum lift；Lh: minimum revolution distance of the camshaft in body chamber；Z: between the axial direction of camshaft
Gap；M: the gap of cam type surface and body；hc: the initial mounting distance of injection pump；C: fuel injection pump body height；E: high-pressure oil pipe connects
Head body height；H: fuel filler height on camshaft distance of shaft centers cylinder head；R: high-pressure oil pipe elbow radius；F: oil spout oil pump outlet valve connects
The thread depth of mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479477.6A CN107237709B (en) | 2017-06-22 | 2017-06-22 | High-power diesel engine fuel cam and its design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479477.6A CN107237709B (en) | 2017-06-22 | 2017-06-22 | High-power diesel engine fuel cam and its design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107237709A CN107237709A (en) | 2017-10-10 |
| CN107237709B true CN107237709B (en) | 2019-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710479477.6A Active CN107237709B (en) | 2017-06-22 | 2017-06-22 | High-power diesel engine fuel cam and its design method |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB896030A (en) * | 1958-12-13 | 1962-05-09 | Bosch Gmbh Robert | Improvements in or relating to cams |
| DE3622143A1 (en) * | 1986-07-02 | 1988-01-14 | Daimler Benz Ag | Sliding pair comprising a control cam and a valve actuating lever |
| JPH11229825A (en) * | 1998-02-12 | 1999-08-24 | Yamaha Motor Co Ltd | Valve gear |
| CN105221316A (en) * | 2015-10-19 | 2016-01-06 | 北京理工大学 | A kind of isobaric fuel cam molded line parameterization design method |
| CN106677852B (en) * | 2016-12-30 | 2019-02-26 | 北京理工大学 | A kind of Valve-train Cam design method |
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2017
- 2017-06-22 CN CN201710479477.6A patent/CN107237709B/en active Active
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| CN107237709A (en) | 2017-10-10 |
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Effective date of registration: 20200907 Address after: No.82 Xingfa Road, Lvshun Economic Development Zone, Dalian City, Liaoning Province Co-patentee after: CRRC Dalian Co.,Ltd. Patentee after: Dalian CRRC Diesel Engine Co., Ltd Address before: 116022 Shahekou, Liaoning, China No. 51 The Strip Patentee before: CRRC Dalian Co.,Ltd. |
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