TO DESIGN AND ANALYSE THE MOTION STUDY OF IC ENGINE VALVE MECHANISM

AIM: TO DESIGN AND ANALYSE THE MOTION STUDY OF IC ENGINE VALVE MECHANISM USING SOLIDWORKS.

OBJECTIVE:

• To create 3D models for all parts.
• To perform motion analysis by rotating the input cam at 1500 rpm.
• To obtain a plot for Valve lift.
• To obtain a plot for contact force between cam and push rod.
• To obtain a plot for contact force between push rod and rocker arm.
• To obtain a plot for contact force between rocker arm and valve
• To export the results to a spreadsheet.
• To create motion study for two conditions-

Study number	Cam lift	Speed (in rpm)	Material
1	3.5 mm	1500	Cast carbon steel
2	6 mm	1500	Cast carbon steel

OVERVIEW AND CALCULATION:

Engine valves are used in engines to allow air or air-fuel mixture to enter into the cylinder (through inlet valve) and also to push exhaust gases (through outlet valve) from the cylinder at a specific time during the engine cycle.

A complete mechanism is involved in actuating the inlet and exhaust valves (opening & closing) through the motion of different components come in valve train. A cam is used as a drive to actuate the valve and this cam rotates at half of the speed of crankshaft in a four-stroke engine. Following are the various components of valve train.

1. Cam
2. Push rod
3. Rocker arm
4. Valve
5. Valve mount

Calculation-

For Cam lift 3.5 mm:

D1 = 25 mm R1 = 12.50 mm

D2 = 10 mm R2 = 5 mm

L = 10.5 mm

For Cam lift 6 mm:

D1 = 25 mm R1 = 12.50 mm

D2 = 10 mm R2 = 5 mm

L = 13.5 mm

3D MODELS:

1. Cam

2. Push rod

3. Rocker arm

4. Valve

5. Valve mount

6. Assembly

Material -

BODY OF CONTENT:

1. Study-1 (3.5mm cam lift)

Firstly, we will set up the Cam speed to 1500 rpm, as -

Then, making contacts between the parts, as –

Setting up gravity to Y-axis, as -

Now, Adding the spring, as -

Then we will get the plot as by clicking on result and plots section -

2. Study-2 (6 mm cam lift)

Firstly, we will set up the Cam speed to 1500 rpm, as -

Then, making contacts between the parts, as –

Setting up gravity to Y-axis, as -

Now, Adding the spring, as -

Then we will get the plot as by clicking on result and plots section -

RESULTS:

1. Study-1 (3.5mm cam lift)

Valve lift

Contact force between Cam and Push rod

Contact force between Push rod and rocker arm

Contact force between Rocker arm and Valve

2. Study-2 (6 mm cam lift)

Valve lift

Contact force between cam and push rod

Contact force between push rod and rocker arm

Contact force between Rocker arm and Valve

Drive link for 3D parts, Results in ExcelSheet

https://drive.google.com/file/d/1vj8gHooOqwS81MNrAHJUnImuE4sHu9V8/view?usp=sharing

Animation video