VRT200 VRT205 29051001231

Structure of Transmission

VRT200 transmission is mainly composed of three parts: torque converter, transmission box (clutch box) and transfer case (PTO), as shown in Fig. 2-1. Power from engine is processed by the transmission (slowdown and increase torsion) and outputted via the PTO. By engaging the KR gears in the transmission box, backward driving of the vehicle can be realized.

Fig. 2-2

1 Lubricating oil valve 2 Oil filler of transmission box 3 Oil filler of transfer case 4 Oil dipstick of transfer case 5 Parking brake 6 Brake disc 7 Oil drain plug of transfer case 8 Oil pan 9 Transmission control valve 10 Power takeoff (PTO) 11 Filter 12 Turbine

Torque Converter

Structure of torque converter

Fig. 2-3

1 Elastic plate 2 Front cover 3 Turbine 4 Guide wheel 5 Pump impeller 6 Turbine shaft 7 Guide wheel seat

Torque converter is composed of elastic plate, front cover, pump impeller, guide wheel, turbine and turbine shaft. The guide wheel seat is fixed on torque converter housing, the transfer gear is fixed with front cover and supported on guide wheel seat by needle bearings. Front cover, pump impeller, guide wheel and turbine are all adopt unitary structure, which are connected with guide wheel seat by spline.

2. Power transmission line of torque converter

Power input: The outer bolts of elastic plate are connected with engine flywheel, while the inner bolts are connected with torque converter front cover and pump impeller, so as to transmit power from engine to the converter.

Power output of torque converter is separated into two parts:

(1) Output by turbine shaft, one end of turbine shaft is connected with turbine module by spline, the other end is connected with front/rear baffle shaft by spline too. So as to transmit one part of power to the transmission.

(2) Output by the transfer gear that secured together with front cover, power from the transfer gear passes through two transition wheels to drive the working pump and steering pump.

Fig. 2-4

Oil supply of torque converter

Two oil galleries are processed in/on torque converter guide wheel seat, the outside one is oil inlet of torque converter, while the inner one is oil outlet. An inlet relief valve is installed in the inlet port of torque converter housing (guide wheel seat), which is used to control the inlet oil pressure. While the outlet oil pressure is controlled by counterbalance valve that installed on lubricating oil valve assembly. The contact area between guide wheel seat excircle and the transfer gear, and contact area between turbine shaft and guide wheel seat inner bore are sealed by seal rings that made from polyester material. Refer to Fig. 2-5 for oil supply diagram of torque coveter.

Fig. 2-5

Clutch Box (Transmission Box)

Structure of clutch box

Fig. 2-6

1 Torque converter 2 Transition gear for KR gears 3 K1/K2 clutch shaft assembly 4 KF/KR clutch shaft assembly 5 Intermediate shaft 6 K3/K4clutch shaft assembly

Clutch box consists of 4 shafts and 6 similarly structured gear clutches. K1 and K2 clutch, K3 and K4 clutch, and KF and KR clutch are respectively installed on three clutch shafts. An intermediate shaft is installed in the middle of the three clutch shafts. By engagement of the intermediate gear and gears that installed on three clutch shafts, forward-4-reverse-4 gear function can be realized. Inner ends of the four shafts are supported by torque converter housing, while the outer ends are supported by transmission box housing.

2. Power transmission line of clutch box

Power from torque converter passes through turbine shaft to KF/KR clutch shaft in clutch box (by engaging of KF gear and intermediate gear). A transition gear is designed between KR gear and intermediate gear to carry out speed reduction, torque increasing and power transfer direction. And then power passes through gears in clutch box to transfer case.

3. Clutch assembly

Clutch is mainly composed of clutch shaft, isolation carrier (two-way oil cylinder block), piston, drive and driven friction plates, clutch hub, pressure plate, gear assembly (gear, ring gear), return spring and bearings.

Fig. 2-7

1 Clutch shaft 2 Bearing 3 Gear assembly 4 Pressure plate

The pressure oil delivered by transmission control valve, flows into oil cylinder through oil gallery inside the clutch shaft, to push the piston to move and press the friction plate against the pressure plate. And then power outputs via the ring gear (gear assembly) that connected with drive friction plate.

(1) KF/KR clutch

Installation site of clutch assembly

KF/KR clutch assembly is installed in top of transmission box, supported on torque