CN101886560B - Air distribution cam - Google Patents

Air distribution cam Download PDF

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Publication number
CN101886560B
CN101886560B CN201010194766XA CN201010194766A CN101886560B CN 101886560 B CN101886560 B CN 101886560B CN 201010194766X A CN201010194766X A CN 201010194766XA CN 201010194766 A CN201010194766 A CN 201010194766A CN 101886560 B CN101886560 B CN 101886560B
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equal
cam
angle
lift
engine
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CN101886560A (en
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韩东
陈永全
李力
赖永华
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Lifan Technology Group Co Ltd
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Lifan Industry Group Co Ltd
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Abstract

The invention discloses an air distribution cam. The working section of the cam profile of the air distribution cam adopts a high-order polynomial dynamic equation, namely, H=Hmax(1+c2theta<2>+c4theta<4>+cptheta<p>+cqtheta<q>+crtheta<r>+cstheta<s>), wherein Hmax is equal to 6.4 to 6.6mm; c2 is equal to -1.6 to -1.8; c4 is equal to 0.1 to 0.2; cp is equal to 9.0 to 13.0; cq is equal to -10 to -18;cr is equal to 5 to 15; cs is equal to -0.8 to -1.6; p is equal to 12 to 18; q is equal to 15 to 20; r is equal to 22 to 35; and s is equal to 28 to 36. The base diameter phi of the cam is equal to 26.6mm; an overall wrap angle is between 170 and 190 degrees; the angle of the working section is between 120 and 150 degrees; and the angle theta1 and the theta2 of a buffer section are respectively between 20 and 30 degrees and between 20 and 30 degrees. The air distribution cam has the advantages of effectively ensuring the medium and low-rotating speed volumetric efficiency of an engine, improving the power and a torque of the engine and meeting the operating requirements, such as low rotating speed, large torque output, high durability, high reliability and high comfort, of the engine.

Description

A kind of valve cam
Technical field
The present invention relates to a kind of engine fittings, particularly the engines distribution cam on the motor tricycle.
Background technique
The valve cam molded lines has significant effects to engine performance, and the choose reasonable valve timing guarantees that best inflation effect is unusual important problem for improving engine performance.At present, widely used cam profile design method has sinusoidal parabolic shape, combination polynomial type and high-order moment type etc. in the petrol engine field.Wherein the cam profile of high-order moment type is because of its acceleration diagram smooth degree height, and the advantage that the distribution device leveling style is easy to guarantee is most widely used.
Motor tricycle motor on the Domestic market is continued to use the design concept of rev-happy engine always and is developed, and the general maximum net performance number of the output characteristics of motor appears at about speed of crankshaft 9000r/min; Maximum torque appears at about speed of crankshaft 7500r/min.The working stroke design of tradition high speed engine is shorter, therefore when guaranteeing high speed the intake efficiency of motor acceleration is less so the lift of valve cam active section molded lines generally adopts, the relatively large line design of linear velocity, the distribution device traveling comfort is relatively poor, the noise of motor complete machine is bigger, and be difficult to satisfy the engine for motorcycle slow-speed of revolution nowadays, high pulling torque, serviceability is strong, reliability is high, the usage requirement of travelling comfort.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of tricycle engine valve cam, with guarantee in the motor, slow-revving charging efficiency.
Technological scheme of the present invention is as follows: a kind of tricycle engine valve cam, and its cam profile active section adopts the high-order moment dynamic equation, and its equation is:
H＝H max(1+c 2θ 2+c 4θ 4+c pθ p+c qθ q+c rθ r+c sθ s)
Wherein: H is a cam lift, and Hmax is the cam maximum lift,
θ is a cam angle degree, and p.q.r.s is an index;
Its key is: in the above-mentioned equation:
Hmax＝6.4～6.6mm
c 2＝-1.6～-1.8 c 4＝0.1～0.2
c p＝9.0～13.0 c q＝-10～-18 c r＝5～15 c s＝-0.8～-1.6
p＝12～18 q＝15～20 r＝22～35 s＝28～36
Cam base circle diameter ￠=26.6mm;
Total cornerite is 170 °～190 °; The active section angle is 120 °～150 °;
Breeze way angle θ 1=20～30 °, θ 2=20～30 °.
Adopt above technological scheme, by selecting the made valve cam of basic parameter of the present invention, its cam profile acceleration diagram is smooth, continuous and do not have sudden change, and distribution device operates steadily, and can effectively control the motor total noise of centrifuge; Simultaneously, valve cam of the present invention adopts less total cornerite (170 °～190 °) and short breeze way (θ 1=20～30 °; θ 2=20～30 °), effectively improved motor in, charging efficiency during the slow-speed of revolution, thereby guaranteed motor in, power and moment of torsion have tangible lifting during the slow-speed of revolution.
The contrast of 150ml engine test bench characteristic output test data is as shown in the table before and after using the present invention:
150ml engine test bench characteristic test data contrasts before and after using the present invention
Figure BSA00000150036100031
As can be known, (4000～6500r/min) times Engine torque remains at more than the 11.0N.m, and maximum power is 7.67Kw when 7500r/min at speed of crankshaft to use motor behind the valve cam of the present invention from last table; Maximum Torque is 11.5N.m when 5000r/min; Engine cylinder head temperature≤200 ℃, motor consumption minimization rate≤311.05g/ (Kw.h).
As preferably, the corresponding relation of described cam angle degree and cam lift forms the lift table, and this lift table is:
Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm)
90 0.0000 120 0.2764 150 2.9097 180 6.5000 210 2.9965 240 0.3158 270 0.0004
91 0.0002 121 0.3038 151 3.0699 181 6.4921 211 2.8492 241 0.2872 271 0.0000
92 0.0008 122 0.3345 152 3.2343 182 6.4747 212 2.7054 242 0.2619 272 0.0000
93 0.0019 123 0.3688 153 3.4024 183 6.4476 213 2.5651 243 0.2398 273 0.0000
94 0.0037 124 0.4068 154 3.5739 184 6.4109 214 2.4287 244 0.2205 274 0.0000
95 0.0062 125 0.4484 155 3.7483 185 6.3645 215 2.2961 245 0.2038 275 0.0000
96 0.0096 126 0.4937 156 3.9249 186 6.3083 216 2.1675 246 0.1895 276 0.0000
97 0.0139 127 0.5430 157 4.1029 187 6.2423 217 2.0430 247 0.1771 277 0.0000
98 0.0191 128 0.5962 158 4.2816 188 6.1662 218 1.9226 248 0.1663 278 0.0000
99 0.0254 129 0.6534 159 4.4599 189 6.0801 219 1.8064 249 0.1565 279 0.0000
100 0.0327 130 0.7147 160 4.6366 190 5.9841 220 1.6944 250 0.1472 280 0.0000
101 0.0409 131 0.7802 161 4.8105 191 5.8785 221 1.5866 251 0.1379
102 0.0500 132 0.8500 162 4.9802 192 5.7633 222 1.4830 252 0.1285
103 0.0599 133 0.9240 163 5.1442 193 5.6389 223 1.3837 253 0.1187
104 0.0704 134 1.0025 164 5.3011 194 5.5058 224 1.2885 254 0.1086
105 0.0813 135 1.0855 165 5.4494 195 5.3653 225 1.1976 255 0.0982
106 0.0922 136 1.1731 166 5.5882 196 5.2186 226 1.1108 256 0.0876
107 0.1032 137 1.2653 167 5.7169 197 5.0668 227 1.0282 257 0.0771
108 0.1139 138 1.3623 168 5.8356 198 4.9109 228 0.9496 258 0.0666
109 0.1242 139 1.4640 169 5.9447 199 4.7519 229 0.8752 259 0.0565
110 0.1341 140 1.5706 170 6.0440 200 4.5906 230 0.8048 260 0.0469
111 0.1436 141 1.6822 171 6.1337 201 4.4278 231 0.7384 261 0.0381
112 0.1529 142 1.7987 172 6.2136 202 4.2643 232 0.6760 262 0.0301
113 0.1623 143 1.9201 173 6.2837 203 4.1008 233 0.6175 263 0.0231
114 0.1725 144 2.0467 174 6.3439 204 3.9377 234 0.5630 264 0.0170
115 0.1840 145 2.1782 175 6.3944 205 3.7757 235 0.5123 265 0.0120
116 0.1974 146 2.3148 176 6.4349 206 3.6152 236 0.4655 266 0.0079
117 0.2130 147 2.4563 177 6.4657 207 3.4567 237 0.4225 267 0.0048
118 0.2312 148 2.6027 178 6.4868 208 3.3005 238 0.3833 268 0.0026
119 0.2523 149 2.7539 179 6.4982 209 3.1470 239 0.3477 269 0.0012
Beneficial effect: the present invention reaches the requirement that cooperates the slow-speed of revolution, high pulling torque engine for motorcycle port timing better by the lifting curve (cam profile) that changes valve cam, thereby effectively guaranteed in the motor, slow-revving charging efficiency, the power and the moment of torsion of motor have been promoted, engine low rotation speed, high pulling torque output have been satisfied, the usage requirement that serviceability is strong, reliability is high, travelling comfort is good.
Description of drawings
Fig. 1 is an outline drawing of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is a lifting curve sketch of the present invention.
Fig. 4 is a velocity curve sketch of the present invention.
Fig. 5 is an acceleration diagram sketch of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
To shown in Figure 5, longer as Fig. 1 at the slow-speed of revolution, high pulling torque engine for motorcycle working stroke, characteristics such as piston is less, and the inlet and outlet door is less; Guarantee in bent axle, motor has sufficient intake efficiency during the slow-speed of revolution, the present invention redesigns the molded lines of valve cam, its active section adopts high-order moment dynamic equation, its equation is:
H＝H max(1+c 2θ 2+c 4θ 4+c pθ p+c qθ q+c rθ r+c sθ s)
Wherein: H is a cam lift, and Hmax is the cam maximum lift,
θ is a cam angle degree, and p.q.r.s is an index;
It is characterized in that: in the above-mentioned equation:
Hmax＝6.4～6.6mm
c 2＝-1.6～-1.8 c 4＝0.1～0.2
c p＝9.0～13.0 c q＝-10～-18 c r＝5～15 c s＝-0.8～-1.6
p＝12～18 q＝15～20 r＝22～35 s＝28～36
Cam base circle diameter ￠=26.6mm;
Total cornerite is 170 °～190 °; The active section angle is 120 °～150 °;
Breeze way angle θ 1=20～30 °, θ 2=20～30 °.
With the 150ml motor is example, and the corresponding relation of described cam angle degree and cam lift forms the lift table, and this lift table is:
Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm) Angle (θ) Lift (mm)
90 0.0000 120 0.2764 150 2.9097 180 6.5000 210 2.9965 240 0.3158 270 0.0004
91 0.0002 121 0.3038 151 3.0699 181 6.4921 211 2.8492 241 0.2872 271 0.0000
92 0.0008 122 0.3345 152 3.2343 182 6.4747 212 2.7054 242 0.2619 272 0.0000
93 0.0019 123 0.3688 153 3.4024 183 6.4476 213 2.5651 243 0.2398 273 0.0000
94 0.0037 124 0.4068 154 3.5739 184 6.4109 214 2.4287 244 0.2205 274 0.0000
95 0.0062 125 0.4484 155 3.7483 185 6.3645 215 2.2961 245 0.2038 275 0.0000
96 0.0096 126 0.4937 156 3.9249 186 6.3083 216 2.1675 246 0.1895 276 0.0000
97 0.0139 127 0.5430 157 4.1029 187 6.2423 217 2.0430 247 0.1771 277 0.0000
98 0.0191 128 0.5962 158 4.2816 188 6.1662 218 1.9226 248 0.1663 278 0.0000
99 0.0254 129 0.6534 159 4.4599 189 6.0801 219 1.8064 249 0.1565 279 0.0000
100 0.0327 130 0.7147 160 4.6366 190 5.9841 220 1.6944 250 0.1472 280 0.0000
101 0.0409 131 0.7802 161 4.8105 191 5.8785 221 1.5866 251 0.1379
102 0.0500 132 0.8500 162 4.9802 192 5.7633 222 1.4830 252 0.1285
103 0.0599 133 0.9240 163 5.1442 193 5.6389 223 1.3837 253 0.1187
104 0.0704 134 1.0025 164 5.3011 194 5.5058 224 1.2885 254 0.1086
105 0.0813 135 1.0855 165 5.4494 195 5.3653 225 1.1976 255 0.0982
106 0.0922 136 1.1731 166 5.5882 196 5.2186 226 1.1108 256 0.0876
107 0.1032 137 1.2653 167 5.7169 197 5.0668 227 1.0282 257 0.0771
108 0.1139 138 1.3623 168 5.8356 198 4.9109 228 0.9496 258 0.0666
109 0.1242 139 1.4640 169 5.9447 199 4.7519 229 0.8752 259 0.0565
110 0.1341 140 1.5706 170 6.0440 200 4.5906 230 0.8048 260 0.0469
111 0.1436 141 1.6822 171 6.1337 201 4.4278 231 0.7384 261 0.0381
112 0.1529 142 1.7987 172 6.2136 202 4.2643 232 0.6760 262 0.0301
113 0.1623 143 1.9201 173 6.2837 203 4.1008 233 0.6175 263 0.0231
114 0.1725 144 2.0467 174 6.3439 204 3.9377 234 0.5630 264 0.0170
115 0.1840 145 2.1782 175 6.3944 205 3.7757 235 0.5123 265 0.0120
116 0.1974 146 2.3148 176 6.4349 206 3.6152 236 0.4655 266 0.0079
117 0.2130 147 2.4563 177 6.4657 207 3.4567 237 0.4225 267 0.0048
118 0.2312 148 2.6027 178 6.4868 208 3.3005 238 0.3833 268 0.0026
119 0.2523 149 2.7539 179 6.4982 209 3.1470 239 0.3477 269 0.0012
From accompanying drawing and above-mentioned explanation as can be known, cam profile of the present invention adopts that acceleration is big, the less molded lines design of linear velocity, and acceleration diagram is smooth, continuously and do not have sudden change, and distribution device operates steadily, and can effectively control the motor total noise of centrifuge; Simultaneously, valve cam of the present invention adopts less total cornerite (170 °～190 °) and short breeze way (θ 1=20～30 °; θ 2=20～30 °), effectively improved motor in, charging efficiency during the slow-speed of revolution, thereby guaranteed motor in, power and moment of torsion have tangible lifting during the slow-speed of revolution.

Claims (2)

1. valve cam, its cam profile active section adopts high-order moment dynamic equation, and its equation is:
H＝H max(1+c 2θ 2+c 4θ 4+c pθ p+c qθ q+c rθ r+c sθ s)
Wherein: H is a cam lift, and Hmax is the cam maximum lift,
θ is a cam angle degree, and p.q.r.s is an index;
It is characterized in that: in the above-mentioned equation:
Hmax＝6.4～6.6mm
c 2＝-1.6～-1.8?c 4＝0.1～0.2
c p＝9.0～13.0?c q＝-10～-18?c r＝5～15?c s＝-0.8～-1.6
p＝12～18?q＝15～20?r＝22～35?s＝28～36
Cam base circle diameter ￠=26.6mm;
Total cornerite is 170 °～190 °; The active section angle is 120 °～150 °;
Breeze way angle θ 1=20～30 °, θ 2=20～30 °.
2. valve cam according to claim 1 is characterized in that: the corresponding relation of described cam angle degree and cam lift forms the lift table, and this lift table is:
Figure DEST_PATH_RE-FSB00000560475100011
CN201010194766XA 2010-06-08 2010-06-08 Air distribution cam Expired - Fee Related CN101886560B (en)

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102486104B (en) * 2010-12-31 2013-11-06 上汽通用五菱汽车股份有限公司 Exhaust cam of small gasoline engine
CN102486103B (en) * 2010-12-31 2013-09-11 上汽通用五菱汽车股份有限公司 Air admission cam for small gasoline engine
CN102330580B (en) * 2011-10-24 2013-03-06 力帆实业(集团)股份有限公司 Engine camshaft for gerontic motor tricycle
CN104389651A (en) * 2014-10-31 2015-03-04 力帆实业(集团)股份有限公司 Inlet cam for supercharged direct injection gasoline engine
CN105484818B (en) * 2016-01-06 2018-09-28 重庆金桥机器制造有限责任公司 The automobile-used single cylinder cam of motor
CN107687353B (en) * 2017-08-22 2020-06-16 哈尔滨工程大学 Integrated low-noise cam molded line of internal combustion engine

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Publication number Priority date Publication date Assignee Title
CN2095285U (en) * 1991-05-10 1992-02-05 湖南长沙汽车发动机研究所 Non-impact cam special for high-speed strengthened gasoline engine
CN101131103A (en) * 2007-08-23 2008-02-27 天津一汽夏利汽车股份有限公司 Symmetrical intake and exhaust cam of three-cylinder gasoline engine
CN201730649U (en) * 2010-06-08 2011-02-02 力帆实业(集团)股份有限公司 Tricycle engine distribution cam

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN2095285U (en) * 1991-05-10 1992-02-05 湖南长沙汽车发动机研究所 Non-impact cam special for high-speed strengthened gasoline engine
CN101131103A (en) * 2007-08-23 2008-02-27 天津一汽夏利汽车股份有限公司 Symmetrical intake and exhaust cam of three-cylinder gasoline engine
CN201730649U (en) * 2010-06-08 2011-02-02 力帆实业(集团)股份有限公司 Tricycle engine distribution cam

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陈美芳.应用MATLAB设计柴油机七项式动力凸轮型线.《现代制造工程》.2007,(第4期),47-50. *
黄劲枝.6105型柴油机配气机构的七项式动力凸轮优化设计.《建设机械技术与管理》.1996,10-11. *

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