Introduction to Analytical Methods for Internal Combustion Engine Cam Mechanisms

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Thus, the first, second, and third cam followers 7, 8, 9 are held in mutually sliding contact for relative angular movement. With the first through third cam followers 7, 8, 9 being thus disconnected, the second and third cam followers 8, 9, which slidingly contact the raised portions 3, are not angularly moved, keeping the intake valves 1a, 1b closed. The second and third cam followers 8, 9 are not affected by the angular movement of the first cam follower 7 in sliding contact with the cam 5. During low-speed operation of the engine, therefore, fuel consumption is reduced inasmuch as the intake valves 1a, 1b remain closed or inoperative.

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When the engine is to operate at a high speed, the first through third cam followers 7, 8, 9 are interconnected by the first and second selective couplings 21, 22, as shown in FIG. More specifically, the pistons 23 are forced by the supplied hydraulic pressure into the second guide holes 35 while pressing the stoppers 24 against the resilient forces of the springs 25 until the stoppers 24 are pressed against the steps The first through third cam followers 7, 8, 9 are interconnected by the first and second selective couplings 21, 22 so that they are caused to swing in unison by the cam 5.

As a consequence, the intake valves 1a, 1b alternately open and close the respective intake ports at the valve timing and valve life according to the profile of the cam 5. The camshaft 2 has a cam 5 and a pair of adjacent annular raised portions 3 disposed on one side of the cam 5. The first and third cam followers 7, 9 are held in sliding contact with the raised portions 3, respectively, and engage the intake valves 1a, 1b, respectively.

The second cam follower 8 is held in sliding contact with the cam 5. The intake valves 1a, 1b are controlled in different speed ranges by the mechanism shown in FIGS. In the low-speed range, the intake valves 1a, 1b remain closed or inoperative since the first and third cam followers 7, 9 are not angularly moved.

In the high-speed range, the intake valves 1a, 1b are caused to alternately open and close their intake ports according to the cam profile of the cam 5. According to a still further embodiment shown in FIGS.

Introduction to Internal Combustion Engine Lecture-02 (Bangla)

The raised portion 3 has a circumferential profile in the shape of a circle corresponding to the base circles 4b, 5b of the low- and high-speed cams 4, 5. The low-speed cam 4 has a cam lobe 4a projecting radially outwardly from the base circle 4b, and the high-speed cam 5 has a cam lobe 5a projecting radially outwardly from the base circle 5b to a greater extent than the cam lobe 4a, the cam lobe 5a also having a larger angular extent than the cam lobe 4a.

The first cam follower 7 is held in sliding contact with the raised portion 3, whereas the second and third cam followers 8, 9 are held in sliding contact with the low- and high-speed cams 4, 5, respectively. The first cam follower 7 has a pair of arm ends engageable with the upper ends of the valve stems of a pair of intake valves 1a, 1b. The first through third cam followers 7, 8, 9 shown in FIG. The structure of FIG.

In the low-speed range, the first through second cam followers 7, 8, 9 are disconnected from each other as shown in FIG. In the medium-speed range, the first and second cam followers 7, 8 are interconnected, while the first and third cam followers 7, 9 are disconnected from each other, as shown in FIG. Thus, the intake valves 1a, 1b are operated by the low-speed cam 4. In the high-speed range, the first through third cam followers 7, 8, 9 are interconnected as shown in FIG.

In FIG. The first and second cam followers 7, 8 are held in sliding contact with the low- and high-speed cams 4, 5, and the third cam follower 9 engaging the intake valves 1a, 1b is held in sliding contact with the raised portion 3. The mechanism shown in FIG. In the medium-speed range, the first and third cam followers 7, 9 are interconnected, while the first and second cam followers 7, 8 are disconnected from each other, as shown in FIG.

While the intake valves 1a, 1b are shown as being operated by each of the valve operating mechanisms, exhaust valves may also be operated by the valve operating mechanisms according to the present invention.

In such a case, unburned components due to exhaust gas turbulence can be reduced in low-speed operation of the engine, whereas high engine output power and torque can be generated by reducing resistance to the flow of an exhaust gas from thee combustion chamber in high-speed operation of the engine. Although certain preferred embodiments have been shown and described, it should be understood that many changes and modifications may be made therein without departing from the scope of the appended claims.

Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : A valve operating mechanism for operating a plurality of valves of a particular cylinder of an internal combustion engine includes a camshaft rotatable in synchronism with rotation of the internal combustion engine and having at least one cam. At least one of a plurality of cam followers slidably engages the cam for selectively operating the valves according to a cam profile of the cam.

The cam followers are selectively interconnected and disconnected to operate the valves in different speed ranges of the internal combustion engine, the speed ranges including a range in which all of the valves remain inoperative. The valves remain inoperative by the annular portion or portions and are operated in a high-speed range by the cam, or selectively in low- and high-speed ranges by low- and high-speed ranges. We claim: 1. A valve operating mechanism for operating a plurality of valves of a particular cylinder of an internal combustion engine, comprising: a camshaft rotatable in synchronism with rotation of the internal combustion engine and having at least one cam;.

A valve operating mechanism according to claim 1, wherein said camshaft has two annular raised portions with one positioned on each said of said cam, said cam followers including cam followers which slidably engage said raised portions, respectively, for controlling said valves, said means including means for selectively keeping said valves inoperative in said range with said raised portions and operating said valves in a high-speed range with said cam.

A valve operating mechanism according to claim 1, wherein said camshaft has an annular raised portion positioned adjacent to said cam, said cam followers including a cam follower which slidably engages said raised portion for controlling said valves, said means including means for selectively keeping said valves inoperative in said range with said raised portion and operating said valves in a high-speed range with said cam.

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Improvement in CAM Shaft Design: An Experimental Application and Recommendation

A valve operating mechanism according to claim 1, wherein said camshaft has two adjacent annular raised portions positioned on one side of said cam, said cam followers including cam followers which slidably engage said raised portions, respectively, for controlling said valves, said means including means for selectively keeping said valves inoperative in said range with said raised portions and operating said valves in a high-speed range with said cam.

A valve operating mechanism according to claim 1, wherein said camshaft has an annular raised portion, a low-speed cam, and a high-speed cam, said raised portion being positioned between said low- and high-speed cams, said cam followers including cam followers which slidably engage said low- and high-speed cams, respectively, and a cam follower which slidably engages said raised portion for controlling said valves, said means including means for selectively keeping said valve inoperative in said range with said raised portion and operating said valves in a low-speed range with said low-speed cam and in a high-speed range with said high speed cam.

A valve operating mechanism according to claim 1, wherein said camshaft has an annular raised portion, a low-speed cam, and a high-speed cam, said low-speed cam being positioned between said raised portion and said high-speed cams, said cam followers including cam followers which slidably engage said low- and high-speed cams, respectively, and a cam follower which slidably engages said raised portion for controlling said valves, said means including means for selectively keeping said valves inoperative in said range with said raised portion and operating said valves in a low-speed range with said low-speed cam and in a high-speed range with said cam.

A valve operating mechanism for operating a plurality of valves of a particular cylinder of an internal combustion engine, comprising: a camshaft carrying an annular raised portion for maintaining said valves in a closed condition and cam means having a cam profile for sequentially opening and closing said valves,. A valve operating mechanism as recited in claim 7 in which said cam means includes a cam profile comprising a base circle and a cam lobe extending radially therefrom and said annular raised portion has a diameter corresponding substantially to that of said base circle.

A valve operating mechanism as recited in claim 8 in which said first cam follower means is a bifurcate member effective to operatively connect said valves to said raised portion. A valve operating mechanism as recited in claim 9 in which said cam means includes a low-speed and a high-speed cam and said interconnecting and disconnecting means including means for connecting and disconnecting said second cam follower means to said first cam followers means for operation of said first cam follower means in response to either said raised portion, said low-speed cam or said high-speed cam.

A valve operating mechanism as recited in claim 10 in which said interconnecting and disconnecting means are effective to selectively connect said first cam follower means with the adjacent second cam follower means. A valve operating mechanism as recited in claim 11 in which said first cam follower means is positioned intermediate the respective of said second cam follower means and said interconnecting and disconnecting means are effective to selectively connect said first cam follower means with either or both of said respective second cam follower means.

USA en. In this dissertation, shows the considerable freedom in positioning of the microphones - distance and plane with respect to the source, and being able to detect the characteristic frequency spectrum of the engine and consequently diagnosis using advanced signal processing.

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The acoustic and vibration spectrums obtained for different rollers are presented on which following conclusions can be drawn. It is observed from the amplitude of frequency has decreased considerably. Using Time Domain Spectrums With comparison of time domain spectrum, it is observed that an RMS value was decreased by the use of new point contact roller in engine of motorcycle.

TusharKiran, S. Vidler Automotive engine performance. Desai, Prof. Fathi Al-Shamma, Faiz F. Mustafa, Sahar M. Zayas, S. Cardona, L. Jordi, Analysis and synthesis of the displacement function of the follower in constant-breadth cam mechanisms, Mechanism and Machine Theory, 44, , ArunavaBiswas, Michael Stevens, Gary L. Simolowo, M. Bamiro, Ph. Number 1. May Yuan L. Lai, Jui P. Hung, and Jian H. Methods Appl. Michalski, J. Marszalek, K. Troncossi, G. Dalpiaz and A. Dispersion diagrams of a water-loaded cylindrical shell obtained from the structural and acoustic responses of the sensor array along the shell B.

Introduction To Analytical Methods For Internal Combustion Engine Cam Mechanisms

Jung ; J. Ryue ; C. Hong 3 ; W.


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