CN203925637U - The petrolic exhaust cam of a kind of natural aspiration - Google Patents
The petrolic exhaust cam of a kind of natural aspiration Download PDFInfo
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- CN203925637U CN203925637U CN201420372912.7U CN201420372912U CN203925637U CN 203925637 U CN203925637 U CN 203925637U CN 201420372912 U CN201420372912 U CN 201420372912U CN 203925637 U CN203925637 U CN 203925637U
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Abstract
The utility model relates to the petrolic exhaust cam of a kind of natural aspiration, comprise basic circle section and cam peach, cam peach is divided into valve opening breeze way, valve opening active section, valve-closing active section and valve-closing breeze way, the valve opening breeze way of one end of basic circle section and cam peach is tangent, point of contact is valve opening buffering starting point, the valve-closing breeze way of the other end of basic circle section and cam peach is tangent, point of contact is valve-closing buffering terminal, separation between valve opening breeze way and valve opening active section is for eliminating valve clearance point completely, separation between valve opening active section and valve-closing active section is valve maximum lift point, separation between valve-closing active section and valve-closing breeze way is valve-closing point, the radius R of basic circle is 18mm, valve maximum lift is 8.0mm, the exhauxt valve opens 1mm duration is 190.5 ° ± 0.5 ° crank angle.It can promote the low side moment of torsion of motor, solves automobile under the slow-speed of revolution and accelerates unable problem.
Description
Technical field
The utility model relates to motor car engine cam, is specifically related to the petrolic exhaust cam of a kind of natural aspiration.
Background technique
Cam design key comprises valve opening stage and valve dwell period, and the power character of motor, Economy depend on valve opening duration, valve opening maximum lift and valve opening and the breeze way height of closing etc. that actuated by cams valve forms.
Engine cam design need take into account the performance index such as oil consumption, power and low side moment of torsion, and natural aspiration petrol engine in the past generally in the time of design cam in order to take into account power and oil consumption, selection can make air inlet or the exhaust cam that the valve lift duration is long, valve lift is large, but be difficult to like this take into account low side moment of torsion, and in car load coupling, the low side that motor low side moment of torsion has directly had influence on car load accelerates power character, particularly, under the motor slow-speed of revolution, when driving, client has obvious acceleration powerlessness.Therefore, need to optimize exhaust cam and promote motor low side moment of torsion, solve under the motor slow-speed of revolution and accelerate unable problem.
Summary of the invention
The purpose of this utility model is to provide a kind of natural aspiration petrolic exhaust cam, can promote the low side moment of torsion of motor, solves automobile under the motor slow-speed of revolution and accelerates unable problem.
The petrolic exhaust cam of natural aspiration described in the utility model, its molded line comprises basic circle section and cam peach, described cam peach is along being divided into counterclockwise valve opening breeze way, valve opening active section, valve-closing active section and valve-closing breeze way, the radial center of the center of circle of described basic circle section and described cam peach coincides with cam center, the valve opening breeze way of one end of described basic circle section and cam peach is tangent, point of contact is valve opening buffering starting point, the valve-closing breeze way of the other end of basic circle section and cam peach is tangent, point of contact is valve-closing buffering terminal, separation between described valve opening breeze way and valve opening active section is for eliminating valve clearance point completely, separation between described valve opening active section and valve-closing active section is valve maximum lift point, separation between described valve-closing active section and valve-closing breeze way is valve-closing point, it is characterized in that: the radius R of described basic circle is 18mm, the corresponding valve lift of valve maximum lift point is 8.0mm, the exhauxt valve opens 1mm duration is 190.5 ° ± 0.5 ° crank angle.
Further, the cornerite β of described valve opening breeze way is 10 °, and its corresponding valve lift increases to 0.09mm gradually from 0mm; The cornerite γ of valve opening active section is 59 °, and its corresponding valve lift increases to 8.0mm gradually from 0.09mm; The cornerite ε of valve-closing active section is 61 °, and its corresponding valve lift is decreased to 0.14mm gradually from 8.0mm; The cornerite λ of valve-closing breeze way is 13.75 °, and its corresponding valve lift is decreased to 0mm gradually from 0.14mm.
The utlity model has following advantage:
(1) accelerate power character demand for low side, the utility model has designed emphatically exhaust cam and has driven the corresponding maximum valve lift of exhaust valve and exhauxt valve opens duration, by dwindling the cornerite of valve opening active section and valve-closing active section, thereby optimize the valve acceleration of valve opening active section and valve-closing active section, improved the Richness of valve lift; By shortening the exhauxt valve opens duration, reduce the backflow of high-temp waste gas, reduce gas exchange loss, improve the charge of fresh air, thereby reach the effect that promotes low side moment of torsion, and then solved when client drives and accelerate unable problem under the motor slow-speed of revolution.
(2) aspect power character, the utility model is in real engine engine bench test, can make certain motor 1500rpm(rev/min) external characteristics moment of torsion lifting 3%, 2000rpm(rev/min) external characteristics moment of torsion lifting 8%, 2500rpm(rev/min) external characteristics moment of torsion lifting 4%, 3000rpm(rev/min) external characteristics moment of torsion lifting 4%.Car load low speed accelerating ability promotes average approximately 6%.
(3) the utility model is coordinating on the technological scheme basis of GDI technology and high compression ratio, and complete-vehicle oil consumption can decline 4%, and car load low speed accelerating ability promotes average approximately 12%.
Brief description of the drawings
Fig. 1 is the molded line schematic diagram of exhaust cam described in the utility model.
Fig. 2 is exhaust valve lift Parameter Map of the present utility model (abscissa is crank angle, and y coordinate is valve lift).
In figure: A-basic circle section, B-cam peach, O-cam center, L-cam maximum lift; 1-valve opening buffering starting point, 2-eliminates valve clearance point completely, 3-valve maximum lift point, 4-valve-closing point, 5-valve-closing buffering terminal.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the petrolic exhaust cam of a kind of natural aspiration, its molded line comprises basic circle section A and cam peach B, described cam peach B is along being divided into counterclockwise valve opening breeze way, valve opening active section, valve-closing active section and valve-closing breeze way, the radial center of the center of circle of described basic circle section A and described cam peach B coincides with cam center O, one end of described basic circle section A and the valve opening breeze way of cam peach are tangent, point of contact is valve opening buffering starting point 1, the other end of basic circle section A and the valve-closing breeze way of cam peach are tangent, point of contact is valve-closing buffering terminal 5, separation between described valve opening breeze way and valve opening active section is for eliminating valve clearance point 2 completely, separation between described valve opening active section and valve-closing active section is valve maximum lift point 3, separation between described valve-closing active section and valve-closing breeze way is valve-closing point 4.
Consider the factors such as layout, valve lift and the exhauxt valve opens duration of camshaft, the radius R of described basic circle A is designed to 18mm, and angle is 216.25 °.
As shown in the c point in Fig. 2, the corresponding valve lift of valve maximum lift point 3 is 8.0mm, has also determined that cam maximum lift L is that 3.979mm(is referring to Fig. 1 simultaneously).
In order to eliminate valve clearance, control valve initial velocity, the cornerite β of described valve opening breeze way is designed to 10 °, and its corresponding valve lift increases to 0.09mm from 0mm, and accordingly, the speed of valve is increased to 0.84mm/rad by 0.
The cornerite γ of valve opening active section is 59 °, and its corresponding valve lift increases to 8.0mm from 0.09mm; The valve speed maximum that valve opening is opened active section reaches 13.47mm/rad, and valve acceleration maximum reaches 47.43mm/rad
2.
The cornerite ε of valve-closing active section is 61 °, and its corresponding valve lift is decreased to 0.14mm from 8.0mm.
The cornerite λ of valve-closing breeze way is 13.75 °, and its effect is the seating velocity in order to control valve, and what unlikely generation the was larger power of taking a seat even causes valve knock-on, and its corresponding valve lift is decreased to 0mm from 0.14mm; The valve speed that valve-closing breeze way is corresponding is reduced to 0 gradually by 0.84mm/rad, and exhaust valve cuts out reposefully.
As shown in Figure 1, cushioned between terminal 5 by valve opening buffering starting point 1 to valve-closing, the exhauxt valve opens 0mm duration is 143.75 ° of cam angles, i.e. 287.5 ° of crank angles (rotating ratio between camshaft and the bent axle of four stroke engine is 1:2) (referring to a section in Fig. 2).Adopt the exhaust valve of this exhaust cam, its valve lift starts to increase to 8.0mm gradually by 1.0mm, is then decreased to gradually 1.0mm, and the exhauxt valve opens 1mm duration is 190.5 ° ± 0.5 ° crank angle (referring to the b section in Fig. 2).
The phase parameter of valve: the position that exhaust valve lift is closed 0mm is 385.5 ± 0.5 ° of crank angles.
Exhaust phase adjusted maximum magnitude is 50 ± 5 ° of crank angles, referring to the d in Fig. 2.
All by adjusting the mode of cam profile or Rocker Ratio; reaching with valve maximum lift is 8.0mm ± 0.1mm, exhauxt valve opens 1mm duration to be the design of the exhaust valve lift parameter same effect of 190.5 ± 0.5 ° of crank angles, all belongs to the utility model protection domain.
Claims (2)
1. the petrolic exhaust cam of natural aspiration, the molded line of this exhaust cam comprises basic circle section (A) and cam peach (B), described cam peach (B) is along being divided into counterclockwise valve opening breeze way, valve opening active section, valve-closing active section and valve-closing breeze way, the radial center of the center of circle of described basic circle section (A) and described cam peach (B) coincides with cam center (O), one end of described basic circle section (A) and the valve opening breeze way of cam peach are tangent, point of contact is valve opening buffering starting point (1), the other end of basic circle section (A) and the valve-closing breeze way of cam peach are tangent, point of contact is valve-closing buffering terminal (5), separation between described valve opening breeze way and valve opening active section is for eliminating valve clearance point (2) completely, separation between described valve opening active section and valve-closing active section is valve maximum lift point (3), separation between described valve-closing active section and valve-closing breeze way is valve-closing point (4), it is characterized in that: the radius R of described basic circle (A) is 18mm, the corresponding valve lift of valve maximum lift point (3) is 8.0mm, the exhauxt valve opens 1mm duration is 190.5 ° ± 0.5 ° crank angle.
2. the petrolic exhaust cam of natural aspiration according to claim 1, is characterized in that: the cornerite β of described valve opening breeze way is 10 °, and its corresponding valve lift increases to 0.09mm gradually from 0mm; The cornerite γ of valve opening active section is 59 °, and its corresponding valve lift increases to 8.0mm gradually from 0.09mm; The cornerite ε of valve-closing active section is 61 °, and its corresponding valve lift is decreased to 0.14mm gradually from 8.0mm; The cornerite λ of valve-closing breeze way is 13.75 °, and its corresponding valve lift is decreased to 0mm gradually from 0.14mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420372912.7U CN203925637U (en) | 2014-07-07 | 2014-07-07 | The petrolic exhaust cam of a kind of natural aspiration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420372912.7U CN203925637U (en) | 2014-07-07 | 2014-07-07 | The petrolic exhaust cam of a kind of natural aspiration |
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| Publication Number | Publication Date |
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| CN203925637U true CN203925637U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420372912.7U Active CN203925637U (en) | 2014-07-07 | 2014-07-07 | The petrolic exhaust cam of a kind of natural aspiration |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529213A (en) * | 2019-09-24 | 2019-12-03 | 深圳臻宇新能源动力科技有限公司 | Exhaust cam and engine with it |
| CN110593981A (en) * | 2019-09-24 | 2019-12-20 | 深圳臻宇新能源动力科技有限公司 | Intake cam and engine with same |
| CN115263483A (en) * | 2022-07-01 | 2022-11-01 | 奇瑞汽车股份有限公司 | Cam, camshaft and engine |
| CN115405395A (en) * | 2022-10-08 | 2022-11-29 | 中车资阳机车有限公司 | Camshaft based on Miller cycle technology and 280 diesel engine |
-
2014
- 2014-07-07 CN CN201420372912.7U patent/CN203925637U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110529213A (en) * | 2019-09-24 | 2019-12-03 | 深圳臻宇新能源动力科技有限公司 | Exhaust cam and engine with it |
| CN110593981A (en) * | 2019-09-24 | 2019-12-20 | 深圳臻宇新能源动力科技有限公司 | Intake cam and engine with same |
| CN115263483A (en) * | 2022-07-01 | 2022-11-01 | 奇瑞汽车股份有限公司 | Cam, camshaft and engine |
| CN115263483B (en) * | 2022-07-01 | 2024-03-26 | 奇瑞汽车股份有限公司 | Cam, cam shaft and engine |
| CN115405395A (en) * | 2022-10-08 | 2022-11-29 | 中车资阳机车有限公司 | Camshaft based on Miller cycle technology and 280 diesel engine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |