Lecture 13 - Transmission II

Question 1

Variable speed transmissions

Answer 1

Under the assumption of a traction motor with a single characteristic point, various characteristic points or a characteristic curve are obtained at the output of the torque converter

Question 2

Characteristic map of a 4 speed transmission

Answer 2

Characteristic map of a combustion engine can be generated through fuel supply
• The starting gap must overcome with a rotational speed converter
• The mapping is to be set in such a way that the remaining gaps of the gearbox output characteristic map are as small as possible

Question 3

Draw the characteristic map of a continuosly variable transmission (13.1)

Answer 3

draw

Question 4

How are implemented continuosly variable transmissions?

Answer 4

In vehicle technology continuosly variable transmissions are implemented as hydrodinamic torque converters

Question 5

What is impeller characteristic?

Answer 5

The impeller wheel of hydrodynamic torque converter develops a torque that is proportional to the square of the motor revolutions

Question 6

What happens with the combination of a combustion engine and a hydrodynamic torque converter?

Answer 6

Only the part coincident with the impeller characteristic is exploited by the motor characteristic map

Question 7

What are hydro-mechanic gears?

Answer 7

Are hydro-dynamic converters to which a mechanic step-transmission is up or down-streamed

Question 8

How does the converter acts?

Answer 8

The start-up converter acts as a speed transmission and as a 1st gear, while breaking, the converter is used as a retarder

Question 9

What happens when filling a converter only partly with oil?

Answer 9

Filling the converter only partly with oil results in an accordinly reduced torque this circumstance is exploited for slow shunting motors

Question 10

Traction Units on Rail vehicles?

Answer 10

Energy generation: combustion engine

energy transformation and distribution: diesel-mechanical drive, diesel hydraulic drive, diesel electric drive

Question 11

Motor control in electric machines

Answer 11

b1: electromechanical vehicle control with direct current

b2,b3: electronic vehicle control

Question 12

Identify the parts of an axle drive with a constant gear ratio between electric motor and wheelset (13.2)

Answer 12

identify