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To see how shift gears work, you can build in stationary gear shifting in
this demonstration model. You can do this quickly, and it demonstrates how
it functions clearly. It is important to ensure that a narrow idling area is lo-
cated between the first and second gear. Then the tooth can catch better
when the gears are shifted.
Task:
Calculate the transmission relations in first and second gear.
Solution:
1st gear: (slow): 20:10 = 2:1,
i.e., the rim rotates at half the engine revolution
2nd gear: (fast): 10:20 = 1:2,
i.e., the rim rotates at double the engine revolution
Model: Vehicle with Gear Shifting
(see the assembly instructions on page 16)
Now you can assembly this vehicle with gear shifting. In the design of every
vehicle, you must ensure that the gears take as little space as possible. The
vehicle has two gears.
12
Task:
How big are the transmission relations in first and second gear?
Solution:
In the second (fast)
gear, the transmis-
sion relation is
10
1
=
=
0,5
20
2
.
Consequently, the vehicle goes four times faster in the second gear than in
the first.
If we base our calculations on the output shaft of the engine gearbox, an-
other transmission level is added, specifically that from the two gears next
to each other with 15 teeth to the gear with 20 teeth.
This level has a transmission of
The total transmission is calculated by multiplying the two transmission lev-
els.
2
4
8
First gear:
or 2.66:1 Second gear:
*
=
1 3
3
Consequently, the wheels rotate somewhat more slowly than in the station-
ary gears (2:1 in first gear; 1:2 or 0.5:1 in second gear).
The following applies: the larger the transmission relation, the smaller the
speed at the driven gear.
Model: Gear Shifting with
Reverse Gear
(see the assembly instructions
on page 18)
In the first (slow)
gear, the trans-
mission relation
is
20
2
=
=
2
10
1
20
4
=
15
3
1
4
2
or 0,66 : 1
*
=
2 3 3
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