Structural And Functional Outline - Takeuchi TB 175 Handbuch

8.1.3 Structural and functional outline

No. Part name
1 Turbine shaft
2 OiN thrower
3 Turbine side seal ring
4 Seal plate
5 Journal bearing
6 Thrust bearing
7 Compressor housing
8 M5 hexagon bolt
9 M5 spring washer
10 Compressor side clamp
11 Turbine housing
12 M6 hexagon bolt
13
Turbine side clamp
14 Lock washer
15 Bearing housing
16 Retaining ring
17 M3 countersunk flat head screw
18
Compressor wheel
19 Shaft end nut
20 Heat protector
(1) Turbine
The exhaust gas from the engine is accelerated at the nozzle portion in the turbine housing and blown onto
the turbine impeller to rotate the turbine shaft.
This is called the turbine. A seal ring and heat insulating plate are installed to prevent the bearing from
adverse influence of the gas.
(2) Compressor
The compressor impeller installed on the turbine shaft rotates with the shaft to suck and compress air for
feeding into the intake manifold.
This is called the blower or compressor.
(3) Bearings
Thrust bearing
As the turbine shaft is constantly applied with a thrust force, this bearing prevents the shaft from being
moved by the thrust force.
Radial bearing
A floating bearing is adopted. Since the bearing moves with the turbine shaft as the oil films are formed
both inside and outside the bearing, the bearing sliding speed is slower than the turbine shaft speed,
resulting in higher dynamic stability.
(4) Compressor side sealing mechanism
To prevent the intake air and oil form leaking, a seal ring and a seal plate are provided to form a double wall
structure on the rear side of the compressor impeller.
(5) Waste gate
When the blower side pressure (intake air pressure) exceeds the specified level, the exhaust gas at the
turbine inlet is partially bypassed to the exhaust discharge side to control the turbine rpm so as to maintain the
intake pressure at the specified level for improving the response to load variation in the low to medium speed
range and to minimize black smoke generation. It consists of a control assembly separated from the
turbocharger and a valve assembly installed in the turbine impeller chamber.
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8. TURBOCHARGER