CN110374706B - Symmetrical distribution cam molded line of engine - Google Patents

Symmetrical distribution cam molded line of engine Download PDF

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CN110374706B
CN110374706B CN201910658422.0A CN201910658422A CN110374706B CN 110374706 B CN110374706 B CN 110374706B CN 201910658422 A CN201910658422 A CN 201910658422A CN 110374706 B CN110374706 B CN 110374706B
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degrees
section
point
base circle
engine
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CN110374706A (en
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陈剑斌
周宋泽
凌国平
张宏飞
江学文
罗玉龙
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Ningbo Shenglong Wuhu Auto Parts Co ltd
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Ningbo Shenglong Wuhu Auto Parts Co ltd
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The invention provides an engine symmetrical distribution cam molded line, which comprises a first base circle section, a second base circle section, an ascending buffer section, a descending buffer section, an ascending working section and a descending working section which are respectively in axisymmetric distribution, wherein the contours of the first base circle section, the second base circle section, the ascending buffer section, the descending buffer section, the ascending working section and the descending working section are modeled by adopting a unified and three-time Bezier model, G2 continuous splicing of intersection points of all sections of the engine symmetrical distribution cam molded line is realized, the impact, abrasion and noise of valve seating are reduced, the working stability and durability of a distribution mechanism are ensured, and the engine performance and the service life are improved.

Description

Symmetrical distribution cam molded line of engine
Technical Field
The invention relates to the technical field of engine gas distribution parts, in particular to a symmetrical gas distribution cam molded line of an engine.
Background
The valve mechanism is one of the most complex and heavy parts in the engine structure, and the design of the valve cam profile plays a decisive role in the performance of the valve mechanism of the engine. In order to ensure the service performance and service life of the engine, the valve driven by the distribution cam is required to have good motion change rules such as lift, speed, acceleration and the like. The existing valve cam structure forms such as the equal acceleration cam, the combined polynomial cam, the higher order polynomial cam and the like have abrupt change of the curvature radius of the cam profile at the intersection point, so that the working stability and the durability of the valve mechanism are difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problems of providing an engine symmetrical distribution cam molded line which ensures the junction point G of a base circle section, a buffer section and a working section of the distribution cam 2 Continuous cam profile to reduce valve train vibration and shock caused by high order discontinuities in the cam profileImproving the performance and service life of the engine.
The technical scheme of the invention is that the symmetrical distribution cam molded line of the engine comprises a first base circle segment (1) and a second base circle segment (6), an ascending buffer segment (2) and a descending buffer segment (5), an ascending working segment (3) and a descending working segment (4) which are respectively in axisymmetric distribution, wherein the outlines of the first base circle segment (1), the second base circle segment (6), the ascending buffer segment (2), the descending buffer segment (5), the ascending working segment (3) and the descending working segment (4) are modeled by adopting a unified and rational three-time Bezier model, and the formulas of the curves of each segment are expressed as follows:
in formula 1, p i (u) is the coordinate value of each point on the cam line, and the unit is mm;B j,3 (u) controlling vertexes and basis functions of the Bezier curves of three times in each segment;
the Bezier control pointThe method comprises the following steps of:
in formula 2, the model value point V 0 To raise the buffer segment start point, the model value point V 1 To raise the end of the buffer segment, the model value point V 2 To raise the end of the working section, the form value point V 3 To lower the end of the working section, the profile point V 4 To lower the buffer segment end point, a model value point V 5 Is the lowest point of the base circle segment; various value points V i According to the base circle radius r 0 Buffer segment wrap angle alpha 0 Buffer section height h 0 Half wrap angle alpha of working section 1 Maximum valve lift H max The specific formula is determined as follows:
V 0 ＝[-r 0 sin(α 0 +α 1 ),r 0 cos(α 0 +α 1 )]equation 3-1;
V 1 ＝[-(r 0 +h 0 )sin(α 1 ),(r 0 +h 0 )cos(α 1 )]equation 3-2;
V 2 ＝[0,r 0 +h 0 +H max ]equation 3-3;
V 3 ＝[(r 0 +h 0 )sin(α 1 ),(r 0 +h 0 )cos(α 1 )]formulas 3-4;
V 4 ＝[r 0 sin(α 0 +α 1 ),r 0 cos(α 0 +α 1 )]formulas 3-5;
V 5 ＝[0,-r 0 ]，V 6 ＝V 0 ，V 7 ＝V 1 ，V 8 ＝V 2 formulas 3-6;
in formula 2, Q i Is the value point V of the overmodel i And V i+1 Is the tangential vector of (2)And->Is a cross point of (2); lambda (lambda) i 、μ i Is a constant to be determined;
tangential vector
Tangential vector intersection point Q i ：
In the formulas 4 and 5, V 6 ＝V 0 ，V 7 ＝V 1 ，V 8 ＝V 2 ；
T in formula 4 i Is a tangential vector adjusting parameter, and 0 < t i < 1, furthermore t 6 ＝t 0 ，t 7 ＝t 1 The specific constraints are as follows:
tangential vector adjustment parameter t 0 The method meets the following conditions:
tangential vector adjustment parameter t 1 : the method is determined by boundary conditions such as the linear speed, the acceleration and the like of the valve cam;
tangential vector adjustment parameter t 2 The method meets the following conditions:
tangential vector adjustment parameter t 3 : from the symmetry, get t 3 ＝1-t 1 ；
Tangential vector adjustment parameter t 4 The method meets the following conditions:
tangential vector adjustment parameter t 5 The method meets the following conditions:
respectively influencing tangential vector adjustment parameters t 0 And t 5 A kind of electronic deviceAnd->Is the middle control point of the cubic Bezier curve of the base circle segment (1):
in the formula 5 of the present invention,
respectively influencing tangential vector adjustment parameters t 4 And t 5 A kind of electronic deviceAnd->Is the middle control point of the cubic Bezier curve of the base circle segment (6):
undetermined constant lambda i The method meets the following conditions: f (lambda) i )＝(κ i /A i ) 2 (1-λ i ) 4 -2κ i /B i (1-λ i ) 2 -B i /κ i+1 λ i +1=0 equation 9;
in the formula 6 of the present invention,
in equation 6, κ i The curvature parameter at the model value point is specifically expressed as follows:
curvature parameter kappa i ：κ 0 ＝e 0 min{A 0 ,B 5 }，κ i ＝e i min{A i ,B i-1 (i=1, 2,.,. 5) equation 11;
in equation 7, e i Is a curvature adjustment variable, and 0 < e i ＜1；
Pending constant mu i The method meets the following conditions:
compared with the prior art, the symmetrical distribution cam molded line of the engine has the following advantages:
1. the two sides of the symmetrical distribution cam molded line of the engine relate to cam diametersEach side is composed of a cam base circle section, a buffer section and a working section, and G of the intersection point of each section of the cam molded line is realized through a rational three-time Bezier curve 2 And the valve mechanism is continuously spliced, so that the working stability and durability of the valve mechanism are ensured.
2. The symmetrical distribution cam type linear valve speed curve of the engine is continuous, the acceleration curve has no large abrupt change at the connecting point, the final speed and the acceleration jump of the buffer section are far smaller than the required values, and the invention is beneficial to reducing the impact, abrasion and noise of valve seating.
3. The curvature and tangential vector of the symmetrical distribution cam molded line of the engine at the molded value point can be properly modified, so that the engine distribution mechanism with different power performance requirements can be conveniently constructed.
Preferably, in determining the undetermined constant lambda i 、μ i When using formula 2, lambda 4 、μ 4 Directly from the intermediate control point of the second base circle segment (6)And->The determination is specifically expressed as follows:
λ 5 、μ 5 can be directly controlled by the middle control point of the first base circle segment (1)And->The determination is specifically expressed as follows:
preferably, the basic design parameters of the symmetrical distribution cam profile of the engine of the present invention are selected as follows,
corresponding to the basic design parameters, the rational three-time Bezier model parameters of the symmetrical distribution cam molded line of the engine are as follows:
corresponding to the basic design parameters and the rational cubic Bezier model parameters of the symmetrical valve cam molded line of the engine, the tappet lift values controlled by the symmetrical valve cam molded line of the engine are as follows:
drawings
FIG. 1 is a schematic view of an engine symmetric distribution cam profile of the present invention.
FIG. 2 is a schematic illustration of the engine symmetric distribution cam profile construction process of the present invention.
FIG. 3 is a valve lifter lift curve for engine symmetric distribution cam profile control of the present invention.
FIG. 4 is a graph of the valve speed profile control of the symmetrical distribution cam profile of the engine of the present invention.
FIG. 5 is a graph of the valve acceleration profile for engine symmetric distribution cam profile control of the present invention.
FIG. 6 is a valve spring curve for engine symmetric distribution cam profile control of the present invention.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification.
In the drawings, the thickness, size and shape of the object have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "including," "containing," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Furthermore, when an expression such as "… at least one" occurs after a list of features listed, the entire listed feature is modified rather than modifying a separate element in the list.
As shown in fig. 1, the symmetrical distribution cam molded line of the engine of the invention comprises a first base circle segment 1, an ascending buffer segment 2, an ascending working segment 3, a descending working segment 4, a descending buffer segment 5 and a second base circle segment 6 which are respectively in axisymmetric distribution.
As shown in FIG. 2, in the construction process of the symmetrical distribution cam molded line of the engine, the molded value point V i The connection points of the sections of the symmetrical distribution cam type line of the engine,is the value point V of the overmodel i Is the tangential of (Q) i Is the tangential->And->Cross point of->For the middle control point of the cubic Bezier curve of the first base circle segment 1, +.>Is the intermediate control point of the cubic Bezier curve of the second base circle segment 6.
The contours of the first base circle segment 1, the rising buffer segment 2, the rising working segment 3, the falling working segment 4, the falling buffer segment 5 and the second base circle segment 6 are modeled by adopting a unified rational cubic Bezier model, and the formulas of curves of all the segments are expressed as follows:
in formula 1, p i (u) is the coordinate value of each point on the cam line, and the unit is mm;B j,3 (u) controlling vertexes and basis functions of the Bezier curves of three times in each segment;
the Bezier control pointThe method comprises the following steps of:
in formula 2, the model value point V 0 To raise the starting point of buffer segment 2, the model value point V 1 To raise the end point of buffer segment 2, the model value point V 2 To raise the end point of the working section 3, the model value point V 3 To lower the end of the working section 4, a profile point V 4 To lower the end point of buffer segment 5, the model value point V 5 Is the lowest point of the base circle segment;
various value points V i According to the base circle radius r 0 Buffer segment wrap angle alpha 0 Buffer section height h 0 Half wrap angle alpha of working section 1 Maximum valve lift H max The specific formula is determined as follows:
V 0 ＝[-r 0 sin(α 0 +α 1 ),r 0 cos(α 0 +α 1 )]equation 3-1;
V 1 ＝[-(r 0 +h 0 )sin(α 1 ),(r 0 +h 0 )cos(α 1 )]equation 3-2;
V 2 ＝[0,r 0 +h 0 +H max ]equation 3-3;
V 3 ＝[(r 0 +h 0 )sin(α 1 ),(r 0 +h 0 )cos(α 1 )]formulas 3-4;
V 4 ＝[r 0 sin(α 0 +α 1 ),r 0 cos(α 0 +α 1 )]formulas 3-5;
V 5 ＝[0,-r 0 ]，V 6 ＝V 0 ，V 7 ＝V 1 ，V 8 ＝V 2 formulas 3-6;
in formula 2, Q i Is the value point V of the overmodel i And V i+1 Is the tangential vector of (2)And->Is a cross point of (2); lambda (lambda) i 、μ i Is a constant to be determined;
tangential vector
Tangential vector intersection point Q i ：
In the formulas 4 and 5, V 6 ＝V 0 ，V 7 ＝V 1 ，V 8 ＝V 2 ；
T in formula 4 i Is a tangential vector adjusting parameter, and 0 < t i < 1, furthermore t 6 ＝t 0 ，t 7 ＝t 1 The specific constraints are as follows:
tangential vector adjustment parameter t 0 The method meets the following conditions:
tangential vector adjustment parameter t 1 : the valve cam linear speed, acceleration and other boundary conditions determine that the valve cam linear speed, acceleration and other boundary conditions can take a tested value of 0.5;
tangential vector adjustment parameter t 2 The method meets the following conditions:
tangential vector adjustment parameter t 3 : from the symmetry, get t 3 ＝1-t 1 ；
Tangential vector adjustment parameter t 4 The method meets the following conditions:
tangential vector adjustment parameter t 5 The method meets the following conditions:
respectively influencing tangential vector adjustment parameters t 0 And t 5 A kind of electronic deviceAnd->The first is the intermediate control point of the cubic Bezier curve of the base circle segment 1:
in the formula 5 of the present invention,
respectively influencing tangential vector adjustment parameters t 4 And t 5 A kind of electronic deviceAnd->Is the intermediate control point of the cubic Bezier curve of the second base circle segment 6:
undetermined constant lambda i The method meets the following conditions: f (lambda) i )＝(κ i /A i ) 2 (1-λ i ) 4 -2κ i /B i (1-λ i ) 2 -B i /κ i+1 λ i +1=0 equation 9;
in the formula 6 of the present invention,
in equation 6, κ i The curvature parameter at the model value point is specifically expressed as follows:
curvature parameter kappa i ：κ 0 ＝e 0 min{A 0 ,B 5 }，κ i ＝e i min{A i ,B i-1 (i=1, 2,.,. 5) equation 11;
in equation 7, e i Is a curvature adjustment variable, and 0 < e i ＜1；
Pending constant mu i The method meets the following conditions:
determining a pending constant lambda i 、μ i When using formula 2, lambda 4 、μ 4 Directly from the intermediate control point of the second base circle segment 6Andthe determination is specifically expressed as follows:
λ 5 、μ 5 directly byThe first is the intermediate control point +.>And->The determination is specifically expressed as follows:
with reference to the currently mature engine performance parameters, the design parameters of the symmetrical distribution cam profile of the engine are selected as follows:
base radius r 0 (mm) 15.5
Buffer section wrap angle alpha 0 (deg) 25
Working section half wrap angle alpha 1 (deg) 60
Buffer section height h 0 (mm) 0.25
Valve maximum lift H max (mm) 7.14
Rise buffer end speed v 0 (mm/rad) 0.344～1.432
Valve jerk J (mm/rad) 3 ) <1000
Corresponding to the basic design parameters, the rational three-time Bezier model parameters of the symmetrical distribution cam molded line of the engine are as follows:
corresponding to the basic design parameters and the rational cubic Bezier model parameters of the symmetrical distribution cam molded line of the engine, the tappet lift values controlled by the symmetrical distribution cam molded line of the engine are as follows:
fig. 3 to 6 are valve motion law curves of the engine symmetrical distribution cam molded line control of the present invention, wherein fig. 3 is a tappet lift curve, fig. 4 is a valve velocity curve, fig. 5 is a valve acceleration curve, and fig. 6 is a valve jump curve. The valve velocity curve characterizes the first derivative of the tappet lift curve, the valve acceleration curve characterizes the second derivative of the tappet lift curve, and the valve jump curve characterizes the third derivative of the tappet lift curve. The valve speed curve controlled by the symmetrical distribution cam molded line of the engine is continuous, the acceleration curve has no large abrupt change at the connecting point, the final speed and the acceleration jump degree of the buffer section are far smaller than the target value, and the adoption of the symmetrical distribution cam molded line of the engine is beneficial to reducing the impact, abrasion and noise of valve seating.

Claims (3)

1. The utility model provides an engine symmetry formula distribution cam molded lines, is first base circle section (1) and second base circle section (6), rising buffer section (2) and decline buffer section (5), rising work section (3) and decline work section (4) that axisymmetric distributes respectively, its characterized in that: the first base circle section (1), the second base circle section (6), the ascending buffer section (2), the descending buffer section (5), the ascending working section (3) and the descending working section (4) are modeled by adopting a unified and rational three-time Bezier model, and the formulas of curves of the sections are expressed as follows:
in formula 1, p i (u) is the coordinate value of each point on the cam line, and the unit is mm;B j,3 (u) controlling vertexes and basis functions of the Bezier curves of three times in each segment;
the Bezier control pointThe method comprises the following steps of:
in formula 2, the model value point V 0 To raise the buffer segment start point, the model value point V 1 To raise the end of the buffer segment, the model value point V 2 To raise the end of the working section, the form value point V 3 To lower the end of the working section, the profile point V 4 To lower the buffer segment end point, a model value point V 5 Is the lowest point of the base circle segment; various value points V i According to the base circle radius r 0 Buffer segment wrap angle alpha 0 Buffer section height h 0 Half wrap angle alpha of working section 1 Maximum valve lift H max The specific formula is determined as follows:
V 0 ＝[-r 0 sin(α 0 +α 1 ),r 0 cos(α 0 +α 1 )]equation 3-1;
V 1 ＝[-(r 0 +h 0 )sin(α 1 ),(r 0 +h 0 )cos(α 1 )]equation 3-2;
V 2 ＝[0,r 0 +h 0 +H max ]equation 3-3;
V 3 ＝[(r 0 +h 0 )sin(α 1 ),(r 0 +h 0 )cos(α 1 )]formulas 3-4;
V 4 ＝[r 0 sin(α 0 +α 1 ),r 0 cos(α 0 +α 1 )]formulas 3-5;
V 5 ＝[0,-r 0 ]formulas 3-6;
in formula 2, Q i Is the value point V of the overmodel i And V i+1 Is the tangential vector of (2)And->Is a cross point of (2); lambda (lambda) i 、μ i Is a constant to be determined;
tangential vector
Tangential vector intersection point Q i ：
In the formulas 4 and 5, V 6 ＝V 0 ，V 7 ＝V 1 ，V 8 ＝V 2 ；
T in formula 4 i Is a tangential vector adjusting parameter, and 0 < t i < 1, furthermore t 6 ＝t 0 ，t 7 ＝t 1 The specific constraints are as follows:
tangential vector adjustment parameter t 0 The method meets the following conditions:
tangential vector adjustment parameter t 1 : the method is determined by boundary conditions such as the linear speed, the acceleration and the like of the valve cam;
tangential vector adjustment parameter t 2 The method meets the following conditions:
tangential vector adjustment parameter t 3 : from the symmetry, get t 3 ＝1-t 1 ；
Tangential vector adjustment parameter t 4 The method meets the following conditions:
tangential vector adjustment parameter t 5 The method meets the following conditions:
respectively influencing tangential vector adjustment parameters t 0 And t 5 A kind of electronic deviceAnd->Is the intermediate control point of the cubic Bezier curve of the first base circle segment (1):
in the formula 6 of the present invention,
respectively influencing tangential vector adjustment parameters t 4 And t 5 A kind of electronic deviceAnd->Is the intermediate control point of the cubic Bezier curve of the second base circle segment (6):
undetermined constant lambda i The method meets the following conditions: f (lambda) i )＝(κ i /A i ) 2 (1-λ i ) 4 -2κ i /B i (1-λ i ) 2 -B i /κ i+1 λ i +1=0 equation 9;
in the formula 9 of the present invention,
in equation 9, κ i The curvature parameter at the model value point is specifically expressed as follows:
curvature parameter kappa i ：κ 0 ＝e 0 min{A 0 ,B 5 }，κ i ＝e i min{A i ,B i-1 (i=1, 2,.,. 5) equation 11;
in equation 11, e i Is a curvature adjustment variable, and 0 < e i ＜1；
Pending constant mu i The method meets the following conditions:
2. the engine symmetrical distribution cam profile of claim 1, wherein:
using equation 2, lambda 4 、μ 4 Directly from the intermediate control point of the second base circle segment (6)And->The determination is specifically expressed as follows:
λ 5 、μ 5 can be directly controlled by the middle control point of the first base circle segment (1)And->The determination is specifically expressed as follows:
3. the engine symmetrical distribution cam profile according to claim 1 or 2, characterized in that: the basic design parameters of the symmetrical distribution cam molded line of the engine are as follows, and the base radius r 0 Is 15.5mm, the wrap angle alpha of the buffer section 0 25 deg. and half wrap angle alpha of working section 1 60deg, buffer section height h 0 0.25mm, valve maximum lift H max End speed v of rising buffer section of 7.14mm 0 Is 0.344-1.432 mm/rad, and the valve jump J is<1000mm/rad 3 ；
The parameters of the rational cubic Bezier model of the symmetrical distribution cam molded line of the engine are as follows, and the tangential vector adjustment parameter t i Wherein, when i is 0, 1,2, 3, 4, 5, 6 and 7 respectively, the corresponding t i Values were 0.0678, 0.73, 0.5, 0.27, 0.9322, 0.5, 0.0678, 0.73 in this order; undetermined constant lambda i Wherein, when i is 0, 1,2, 3, 4, 5, respectively, the corresponding lambda i 0.3205, 0.6795, 0.6795, 0.3205, 0.4624, 0.4624 in this order; pending constant mu i Wherein i is 0, 1,2, 3, 4, 5, respectively, corresponding μ i 0.3205, 0.6795, 0.6795, 0.3205, 0.4624, 0.4624 in this order;
the tappet lift values of the symmetrical distribution cam type line control of the engine are as follows, when the cam angles are 95 degrees, 100 degrees, 105 degrees, 110 degrees, 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, 155 degrees, 160 degrees, 165 degrees, 170 degrees, 175 degrees, 180 degrees, 185 degrees, 190 degrees, 195 degrees, 200 degrees, 205 degrees, 210 degrees, 215 degrees, 220 degrees, 225 degrees, 230 degrees, 235 degrees, 240 degrees, 245 degrees, 250 degrees, 255 degrees, 260 degrees and 265 degrees respectively, the lifter lift is 0mm, 0.0303915mm, 0.0965168mm, 0.1679772mm, 0.2234911mm, 0.25mm, 8625 mm, 0.3982634mm, 0.6932617mm, 1.2055983mm, 1.9361093mm, 2.8447349mm, 3.8611462mm, 4.8977917mm, 5.8605824mm, 6.6557182mm, 7.1934177mm, 7.39mm, 7.1934177mm, 6.6557182mm, 5.8605824mm, 4.8977917mm, 3.8611462mm, 2.84473493mm, 1.9361093mm, 1.2055983mm, 0.6932617mm, 0.3982634mm, 0.276669mm, 0.25mm, 0.2234911mm, 0.1679772mm, 0.09651683mm, 0.0303915mm, 0mm.
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CN105751116A (en) * 2016-04-11 2016-07-13 湖州圣龙汽车动力系统有限公司 Clamping device for cam sheet on assembly type cam shaft
CN105863765A (en) * 2016-05-18 2016-08-17 宁波圣龙汽车动力系统股份有限公司 Sliding type cam shaft with variable valve lift
CN107630729A (en) * 2017-08-31 2018-01-26 哈尔滨工程大学 A kind of Motor Cam Valve and its lifting curve with cosine constant speed model breeze way determine method
CN211648270U (en) * 2019-07-22 2020-10-09 湖州圣龙汽车动力系统有限公司 Symmetrical distribution cam molded line of engine

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