DESCRIPTION
Technical Description
The GL 112 allows the dynamic investigation of cam mechanisms, as used in motors for actuation of the valves. The cam mechanism consists of 4 interchangeable cam plates and 2 different tracers. A mass and a spring are used to simulate the valve. In order to demonstrate the so-called "valve wobble", the spring rate, mass and speed are adjustable within broad limits. A plotter allows the actual lift curves to be recorded. The open design allows the observation of every detail of the movement process. A stroboscope (not supplied) can be used to provide a particularly impressive view of the movement process and lift.
The experimental unit is intended for demonstration purposes in technical education. It is not suitable for use as a test stand for fatigue testing.
Learning Objectives / Experiments
- comparison of different cam forms
- lift curves for non-matching tracer
- lift curve for skipping tracer
- determination of limit speed and comparison with theory
- influence of moving mass
- influence of restoring spring rigidity
FEATURES
Specification
[1] experimental unit for investigation of cam mechanisms
[2] 4 cams: tangent, hollow cam, 2 circular cams with different head radius
[3] tappet with 2 different tracers: flat or roller tappet
[4] 3 interchangeable restoring springs
[5] electric motor with variable speed
[6] moving mass with can be lifted with 5 additional weights; attached to tappet
[7] mechanical drum plotter with plotting spring and coated paper
Technical Data
Three-phase asynchronous motor with frequency converter
- power: 250W
- speed: 60…670min-1
Cams
- 15mm lift
- opening angle: 140°
Spring rigidity
- hard: 5.026N/m
- medium: 2.601N/m
- soft: 613N/m
Masses
- additional weight: 200g
- tappet: 530g
- flat tappet: 93g
- roller: 20g
Plotter: synchronous belt drive
Optical speed sensor
Dimensions and Weight
LxWxH: 800x435x440mm (experimental unit)
LxWxH: 360x315x160mm (display and control unit)
Weight: approx. 68kg
Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery
1 experimental unit
1 display and control unit
4 cams
2 tracer
3 restoring springs
3 blocks of plotter paper
1 combination wrench
1 hexagon screwdriver, short
1 manual
