CN109057904A - A kind of Valve Train of Vehicle Engine based on VVT - Google Patents
A kind of Valve Train of Vehicle Engine based on VVT Download PDFInfo
- Publication number
- CN109057904A CN109057904A CN201810910126.0A CN201810910126A CN109057904A CN 109057904 A CN109057904 A CN 109057904A CN 201810910126 A CN201810910126 A CN 201810910126A CN 109057904 A CN109057904 A CN 109057904A
- Authority
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- China
- Prior art keywords
- splined shaft
- gradual change
- change cam
- valve
- cam
- 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
Links
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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
-
- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
-
- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/34413—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using composite camshafts, e.g. with cams being able to move relative to the camshaft
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L13/0042—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams being profiled in axial and radial direction
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A kind of Valve Train of Vehicle Engine based on VVT, it is related to technical field of engines, to solve, valve stroke and timing adjustable range currently based on VVT technology are limited to carry out accurate fuel feeding matching to driving states, when guaranteeing power output, since air inflow is unadjustable there are larger waste of fuel, the problem of usually bringing sense of discomfort to driver.The present invention includes splined shaft, hub splines, transmission mechanism and axial regulating mechanism and N number of gradual change cam, and N >=1, N are integer；The maximum longitudinal section that each gradual change cam crosses the center line of splined shaft is right-angled trapezium, and the minimum longitudinal section that each gradual change cam crosses the center line of splined shaft is isosceles trapezoid, and the profile of the cross section of gradual change cam is identical as profile of plate cam；Each gradual change cam be fixed on splined shaft and with the top plate of engine valve mandrel ends is corresponding contacts, the two sides of splined shaft are slidably provided with hub splines respectively.The present invention is suitable for vehicular engine.
Description
Technical field
The present invention relates to technical field of engines, and in particular to a kind of Valve Train of Vehicle Engine.
Background technique
In recent years, with the rapid economic development in our country, car ownership increases year by year, fuel consumption and waste
Discharge also increasingly increases, and so that the whole world is faced with the baptisms such as energy shortage and environmental disruption, is with environmental protection at present
Under the major premise of background, how efficiently to become the Main way of engine technology research and development using the energy.
VVT (Variable Valve Timing variable timing technology) is gradually to be applied to Modern Car in recent years
On one of new technology, its opening and closing moment (timing) and change valve motion liter by control engine inlet and outlet door
Journey realizes that best match to improve charge increases coefficient of charge with vehicle operational mode, the torque of engine and
Power is it is hereby achieved that further improve, to improve the fuel economy of automobile.
In traditional Design of Valve, typically required according to most outstanding properties of the vehicle to carried engine,
Proper port timing under a certain revolving speed is determined by testing, and then determines timing marks, when guaranteeing to assemble
Accurately.Having been carried out " two-part " control to inlet valve for the innovation of engine intake valve at present, (double intelligence timings are variable
Valve), admission cam shaft and exhaust cam shaft can be made in 40 ° and 35 ° (angle of crankshaft) ranges, to provide respectively and be more suitable for sending out
The valve timing of motivation operating status switches between two kinds of air inlet modes according to driving states.
Current VVT technology differs from one another on gasoline engine and diesel engine, and can coexist with turbocharging technology.In vapour
In oil machine, air and gasoline optimum mixture ratio are 14.7:1, and common engine air and oil-gas ratio are less than 10:1 at present.
At present VVT technology the problem is that valve stroke with timing adjustable range is limited to carry out to driving states
Accurate fuel feeding matching, when guaranteeing power output, since air inflow is unadjustable there are larger waste of fuel, usually gives
Driver brings the problem of sense of discomfort.
Summary of the invention
The present invention in order to solve the valve stroke currently based on VVT technology with timing adjustable range is limited can not be to driving
State carries out accurate fuel feeding matching, and when guaranteeing power output, since air inflow is unadjustable, there are larger fuel waves
The problem of taking, usually bringing sense of discomfort to driver, and a kind of Valve Train of Vehicle Engine based on VVT is provided.
The technical solution adopted by the present invention to solve the above technical problem is:
It includes splined shaft, hub splines, transmission mechanism, axial regulating mechanism and N number of gradual change cam, and N >=1, N are whole
Number；
The maximum longitudinal section of each excessively respective center line of gradual change cam is right-angled trapezium, and each gradual change cam is excessively respective
The minimum longitudinal section of center line is isosceles trapezoid, and the profile of the cross section of gradual change cam is identical as profile of plate cam；
Each gradual change cam be fixed on splined shaft and with the top plate of engine valve mandrel ends is corresponding contacts, spline
The two sides of axis are slidably provided with hub splines respectively, and bearing is provided on each hub splines, and the outer ring of two bearings is fixed
On motor body, transmission mechanism can drive splined shaft to rotate and can slide on splined shaft, and axial regulating mechanism can drive
Splined shaft axial movement.
Compared with the prior art, the invention has the following beneficial effects:
One, present invention setting gradual change cam, gradual change cam can move axially, can electrodeless adjustment valve stroke and timing,
To realize accurately with oil, achieve the effect that fuel-efficient.
Two, the present invention can adjust the axial position of splined shaft, make valve top according to the difference of engine speed and operating condition
The contact position of bar and cam changes, and then adjusts valve stroke and timing, so that engine can obtain under high low speed
Oil-gas ratio can be increased to 11:1 or more by ideal inlet and outlet efficiency, the present invention, and can fuel-economizing 5% to 20%, promoted dynamic
Power 5% or so.
Detailed description of the invention
Fig. 1 is axonometric drawing of the present invention；
Fig. 2 is main view of the invention；
Fig. 3 is partial enlarged view at the I of Fig. 2；
Fig. 4 is side view of the invention.
Fig. 5 is the side view of gradual change cam 5.
Specific embodiment
Specific embodiment 1: illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, present embodiment it include splined shaft 1,
Hub splines 2, transmission mechanism 3, axial regulating mechanism 4 and N number of gradual change cam 5, N >=1, N are integer；
The maximum longitudinal section of the excessively respective center line 1-1 of each gradual change cam 5 is right-angled trapezium, each 5 mistake of gradual change cam
The minimum longitudinal section of respective center line 1-1 is isosceles trapezoid, profile and the profile of plate cam phase of the cross section of gradual change cam 5
Together；
Each gradual change cam 5 be fixed on splined shaft 1 and with the top plate 7 of 6 end of engine valve mandril is corresponding contacts,
The two sides of splined shaft 1 are slidably provided with hub splines 2 respectively, are provided with bearing 8 on each hub splines 2, two bearings 8
Outer ring is fixed on motor body, and transmission mechanism 3 can drive splined shaft 1 to rotate and can slide on splined shaft 1, is adjusted axially
Mechanism 4 can drive splined shaft 1 to move axially.
Specific embodiment 2: illustrate present embodiment in conjunction with Fig. 1, valve stem 6 described in present embodiment with it is described
Top plate 7 is hinged, and top plate 7 is rotated along 1 length direction of splined shaft.
Other compositions and connection relationship are same as the specific embodiment one.
Specific embodiment 3: illustrate present embodiment in conjunction with Fig. 4, the two neighboring gradual change cam of present embodiment
The angle theta of maximum longitudinal section on 5 is 30-40 °.
So set, adapting to different types of engine.
Other compositions and connection relationship are identical with embodiment two.
Specific embodiment 4: illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the packet of transmission mechanism 3 described in present embodiment
Include driven pulley 3-1, driving pulley 3-2, two thrust plate 3-3 and two thrust ball bearing 3-4；
The center driven pulley 3-1 is machined with the splined hole with the splined shaft 1 cooperation, and driven pulley 3-1 is slidably arranged
On the splined shaft 1, the two sides driven pulley 3-1 are respectively arranged with thrust ball bearing a 3-4, each thrust ball bearing 3-4
It is equipped with a thrust plate 3-3, two thrust plate 3-3 are fixed on motor body, and driving pulley 3-2 is fixed on the engine
Crankshaft 9 side, driving pulley 3-2 connects transmission by belt with driven pulley 3-1.
Present embodiment is rotated by the crankshaft 9 on engine, drives driven pulley 3-1 rotation, and then drive gradual change convex
Wheel 5 rotates the opening and closing to realize valve.
Other compositions and connection relationship are the same as the specific implementation mode 3.
Specific embodiment 5: illustrating present embodiment in conjunction with Fig. 2, Fig. 3 and Fig. 5, axially adjusted described in present embodiment
Saving mechanism 4 includes gear 4-1, rack gear 4-2, pull rod 4-3 and two pressing plate 4-4；
Gear 4-1 intermeshes with rack gear 4-2, and gear 4-1 is slidably arranged in guide rail 4-5 by motor driven, rack gear 4-2
On, guide rail 4-5 is fixed on motor body, and one end of rack gear 4-2 is connected with pull rod 4-3, and the end pull rod 4-3 is connected with pull rod
Cap 4-6, the end of the splined shaft 1 are connected with flange 4-7, and the end of flange 4-7 is machined with the hole with rod cap 4-6 cooperation,
Rod cap 4-6 is arranged in the hole of flange 4-7 and is able to rotate, and rod cap 4-6 is fixed on the end flange 4-7 by two pressing plate 4-4
In the hole in portion.
Pull rod 4-3 is cylindrical bar, and rod cap 4-6 is the plectane bigger than cylindrical bar diameter.
Present embodiment gear 4-1 drive rack moves in a straight line the axial movement to realize splined shaft 1, and then adjusts gradually
Become the position of cam 5, change the contact position of the top plate 7 of gradual change cam 5 and 6 end of valve stem, with adjust valve stroke with
Timing.
Other compositions and connection relationship are identical as specific embodiment four.
When 5 rotational angle of gradual change cam is in α angle, engine is in compression stroke and expansion stroke, starts at this time
Machine valve-closing, when 5 rotational angle of gradual change cam is in β angle, engine is in the exhaust stroke stage, when gradual change cam 5
When rotational angle is in γ angle, engine is in the intake stroke stage.By motor-driven gear 4-1, band carry-over bar is mobile,
Change valve timing and valve stroke, i.e. change gradual change cam 5 rotates the time and valve opening-closing size that γ+β angle needs.
In low engine speeds, drive splined shaft 1 to, reduction mobile far from the direction guide rail 4-5 by pushing drawing rod 4-3
Engine valve exhaust advance angle γ, valve opening is smaller, to reduce expansion work loss, increases torque；Engine turns in height
When fast, by pulling pull rod 4-3 to drive splined shaft 1 to mobile, the greater engine valve exhaust advance angle close to the direction guide rail 4-5
γ, valve opening are larger, it is ensured that have sufficient time discharge exhaust gas inside cylinder, reduce residual waste gas quantity, improve coefficient of charge.
After the present invention, coefficient of charge is greatly improved under the operating condition of middle and slow speed of revolution.This is because the air inlet in middle and slow speed of revolution
Advance angle γ is larger, and IC Intake Valve Closes are more early, can effectively reduce gas in the jar in this way and flow back in air inlet pipe, to improve
Coefficient of charge.Concrete outcome is as shown in following table one.
Table one
| Revolving speed/(rmin-1) | Coefficient of charge before optimization | Coefficient of charge after optimization |
| 2000 | 0.682 | 0.846 |
| 2400 | 0.709 | 0.900 |
| 2800 | 0.685 | 0.876 |
| 3200 | 0.702 | 0.808 |
| 3600 | 0.752 | 0.839 |
| 4000 | 0.791 | 0.839 |
| 4400 | 0.790 | 0.842 |
| 4800 | 0.811 | 0.851 |
| 5200 | 0.836 | 0.865 |
| 5600 | 0.851 | 0.858 |
| 6000 | 0.821 | 0.821 |
Claims (5)
1. a kind of Valve Train of Vehicle Engine based on VVT, it is characterised in that: it include splined shaft (1), hub splines (2),
Transmission mechanism (3), axial regulating mechanism (4) and N number of gradual change cam (5), N >=1, N are integer；
The maximum longitudinal section of the excessively respective center line (1-1) of each gradual change cam (5) is right-angled trapezium, each gradual change cam (5)
The minimum longitudinal section for crossing respective center line (1-1) is isosceles trapezoid, the profile and disc cam of the cross section of gradual change cam (5)
Profile is identical；
Each gradual change cam (5) is fixed on splined shaft (1) and corresponding with top plate (7) of engine valve mandril (6) end
Contact, the two sides of splined shaft (1) are slidably provided with hub splines (2) respectively, are provided with bearing on each hub splines (2)
(8), the outer ring of two bearings (8) is fixed on motor body, and transmission mechanism (3) can drive splined shaft (1) to rotate and can be
Splined shaft slides on (1), and axial regulating mechanism (4) can drive splined shaft (1) to move axially.
2. a kind of Valve Train of Vehicle Engine based on VVT according to claim 1, it is characterised in that: the valve
Hingedly, and top plate (7) is rotated along the splined shaft (1) length direction for mandril 6 and the top plate (7).
3. a kind of Valve Train of Vehicle Engine based on VVT according to claim 2, it is characterised in that: two neighboring
The angle (θ) of maximum longitudinal section on the gradual change cam (5) is 30-40 °.
4. a kind of Valve Train of Vehicle Engine based on VVT according to claim 3, it is characterised in that: the transmission
Mechanism (3) includes driven pulley (3-1), driving pulley (3-2), two thrust plates (3-3) and two thrust ball bearings (3-4)；
The center driven pulley (3-1) is machined with the splined hole with the splined shaft (1) cooperation, and driven pulley (3-1) is slidably set
It sets on the splined shaft (1), the two sides driven pulley (3-1) are respectively arranged with a thrust ball bearing (3-4), each thrust ball
Bearing (3-4) is equipped with a thrust plate (3-3), and two thrust plates (3-3) are fixed on motor body, driving pulley (3-
2) side of fixed crankshaft (9) on the engine, driving pulley (3-2) connect transmission by belt with driven pulley (3-1).
5. a kind of Valve Train of Vehicle Engine based on VVT according to claim 4, it is characterised in that: the axial direction
Regulating mechanism (4) includes gear (4-1), rack gear (4-2), pull rod (4-3) and two pressing plates (4-4)；
Gear (4-1) intermeshes with rack gear (4-2), and by motor driven, rack gear (4-2) is slidably arranged in leads gear (4-1)
On rail (4-5), guide rail (4-5) is fixed on motor body, and one end of rack gear (4-2) is connected with pull rod (4-3), pull rod (4-
3) end is connected with rod cap (4-6), and the end of the splined shaft (1) is connected with flange (4-7), and the end of flange (4-7) adds
Work has the hole with rod cap (4-6) cooperation, and rod cap (4-6) is arranged in the hole of flange (4-7) and is able to rotate, rod cap (4-
6) it is fixed in the hole of the end flange (4-7) by two pressing plates (4-4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810910126.0A CN109057904A (en) | 2018-08-10 | 2018-08-10 | A kind of Valve Train of Vehicle Engine based on VVT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810910126.0A CN109057904A (en) | 2018-08-10 | 2018-08-10 | A kind of Valve Train of Vehicle Engine based on VVT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109057904A true CN109057904A (en) | 2018-12-21 |
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ID=64683384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810910126.0A Pending CN109057904A (en) | 2018-08-10 | 2018-08-10 | A kind of Valve Train of Vehicle Engine based on VVT |
Country Status (1)
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2448928Y (en) * | 1998-09-25 | 2001-09-19 | 吴江 | Mechanism capable changing valve timing phase and valve lift |
| KR20040025208A (en) * | 2002-09-18 | 2004-03-24 | 대우종합기계 주식회사 | Air lntake quantity control system for a engine |
| CN201386576Y (en) * | 2009-02-13 | 2010-01-20 | 王光耀 | Novel camshaft for engine |
| CN201934195U (en) * | 2011-02-23 | 2011-08-17 | 朱成玉 | Variable distribution gas phase control mechanism of internal combustion engine |
| CN102155271A (en) * | 2011-04-01 | 2011-08-17 | 王平 | Engine control device without throttle valve |
| CN102606244A (en) * | 2012-04-01 | 2012-07-25 | 江门市硕普科技开发有限公司 | Mechanical type continuously variable valve mechanism of engine |
| CN206360741U (en) * | 2016-12-31 | 2017-07-28 | 浙江和日摇臂有限公司 | A kind of intake and exhaust rocking arm |
-
2018
- 2018-08-10 CN CN201810910126.0A patent/CN109057904A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2448928Y (en) * | 1998-09-25 | 2001-09-19 | 吴江 | Mechanism capable changing valve timing phase and valve lift |
| KR20040025208A (en) * | 2002-09-18 | 2004-03-24 | 대우종합기계 주식회사 | Air lntake quantity control system for a engine |
| CN201386576Y (en) * | 2009-02-13 | 2010-01-20 | 王光耀 | Novel camshaft for engine |
| CN201934195U (en) * | 2011-02-23 | 2011-08-17 | 朱成玉 | Variable distribution gas phase control mechanism of internal combustion engine |
| CN102155271A (en) * | 2011-04-01 | 2011-08-17 | 王平 | Engine control device without throttle valve |
| CN102606244A (en) * | 2012-04-01 | 2012-07-25 | 江门市硕普科技开发有限公司 | Mechanical type continuously variable valve mechanism of engine |
| CN206360741U (en) * | 2016-12-31 | 2017-07-28 | 浙江和日摇臂有限公司 | A kind of intake and exhaust rocking arm |
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Application publication date: 20181221 |