MBD Simulation on IC Engine Valve Train

Design and MBD Simulation on IC Engine Valve Train

Aim: Design and Motion analysis of IC Engine Valve Train using Solidworks Multi-Body Dynamics.

Theory: A valve train or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combustion chamber, while the exhaust valves control the flow of spent exhaust gasses out of the combustion chamber once combustion is completed.

It consists of five components :

• Cam
• Push Rod
• Rocker Arm
• Valve
• Valve Mount

The valvetrain consists of all the components responsible for transferring the rotational movement of the camshaft into the opening and closing of the intake and exhaust valves. Typical components are listed below in order from the crankshaft to the valves.

Camshaft:

The timing and lifting profile of the valve opening events is controlled by a camshaft, using a neatly designed log in a rotating hole. The camshaft is driven by the crankshaft and - in the case of an engine with a stroke - rotates at the speed of the crankshaft.

Movement is transferred from the crankshaft to the most common camshaft with a ruble time belt, a metallic timing chain, or a set of gears.

Pushrod:

Pushrods are long, thin metal wires used by engines that run over a valve to transfer movement from the camshaft to the valves. The lower end of the pushrod is made up of a lifter, where the camshaft connects. The camshaft lobe moves upwards, which moves the pushrod. The upper end of the fist passes over the arm of the rocker, which opens the valve.

Rocker arm:

Depending on the design used, the valves are fitted with a rocker arm, finger, or bucket tappet. The engines on the camshaft use fingers or a bucket tappet, where the camel meets. The engines that go above the valve use rocker arms, called pushrod and pivot in the shaft or in each ball files to operate the valves.

Valves:

Most modern engines use a poppet type pistol, although slide valve slide valves and rotating valves are also sometimes used. Poppet valves are usually opened by a camshaft lobe or rocker arm, and closed by an integrated spring called a valve spring.

The float valve occurs when the spring valve fails to control the inertia of the valve train at high engine speed (RPM)

Valve mount: Acts a spring for the valve.

Assembly of IC Engine valve train:

Drawing of CAM for Case 01 and Case 02:

Case 01:

Case 02:

Procedure for Motion Analysis:

1. Initially, we will model the components of all 5 components in Solidworks and the unit should be MMGS.
2. After that we will open the Solidworks meeting to begin collecting the five parts of the Solidworks meeting.
3. In this case, the materials we will use will be Cast Carbon Steel.
4. Now that we have completed the meeting and outline the steps we will take to analyze the motion and that we will go further and click on the Solidworks movement.
5. We will now define this car on cam axis as at 1500 rpm it is on time clockwise.
6. In this case 1 we will keep the distance from the source to the snow of the circle as small as 11mm and case 2 as 13.5mm.
7. We will now explain the connection between Cam and Push Rod and then Push Rod and Rocker Arm and then Rocker Arm and Valve.
8. We will now install Spring between Valve and Valve Mount with a hardness of 10N / mm and a distance of about 35mm.
9. Now From the definition of our components we can convert motion analysis to 9000 frames per second.
10. Now we can count and go and get results and locations after the count.

Results:

Case 01:-

Cam and Push Rod:

Linear Displacement of Valve:

Pushrod and Rocker arm:

Rocker arm and Valve in X-Direction:

Rocker arm and Valve (Magnitude):

Case 02:

Cam and Pushrod:

The linear displacement of Valve:

Push Rod and Rocker Arm:

Rocker arm and Valve in X-Direction:

Rocker Arm and Valve ( Magnitude):

The formula for calculation of the distance is:

L = R1 - R2 + (cl)

where cl is the cam lift

All units are in mm

Observation:

With the rise of the Cam, the direct flow of the valve also increased. Therefore, the height of the Valve depends on the composition of the Cam.

The interaction between the Rocker Arm and the valve in relation to the X-direction Force enables communication only in the X-direction. But in the X-directional power you have all the good and the bad when Valve moves up and down.

CAD Parts link:

https://drive.google.com/drive/folders/1gtIEZIKiZDeyU1H1gApxP2eul8-fMOdJ?usp=sharing

Animation Link:

https://youtu.be/gPKWuyNewHk

https://youtu.be/dQzu-h03Xck

Reference: https://www.wikipedia.org/