ZF Description VT1F 040323.pdf

ZF GETRIEBE N.V. SINT-TRUIDEN

Description

Automatic Gearbox

VT1F

Davy Geuns

June 2003

Table of contents

General Description VT1F 4

1. Introduction 4

2. Conventional Autom. Transmission vs. Continuously Var. Transmission 6

3. Basic Principles of Continuously Variable Transmission 7

4. Shift Positions 8

5. Functionality in Park and Neutral 9

6. Normal Operation 9

7. Transmission Communication 10

8. Related Car Components 10

8.1 Centre Controle LEDs 10

8.2 Instument Cluster Display 10

8.3 Selector Lever Mechanics 10

8.4 Torsional Damper 11

9. Towing of the Vehicle 11

10. Drain and Refill 11

II.

Transmission Layout 12

1. Group One – Mechanical Torque Flow 13

1.1 Planetary Gear Set 13

1.2 Multiplate clutches 14

1.3 Pulley and Steel Belt 15

1.4 Pinion Shaft 16

1.5 Differential 16

1.6 Mechanical Operation 17

1.6.1 Selector Lever in the Park or Neutral Position 17

1.6.2 Selector Lever in the Drive Position 18

1.6.3 Selector Lever in the Reverse Position 19

2. Group Two – Control System 20

2.1 Oil Pump 20

2.2 Valves 21

2.3 Pitot system 21

2.4 Sensing Shoe 22

2.5 Oil Temperature Sensor 22

3. Group Three – External Connections 23

3.1 Park / Neutral Switch 23

3.2 Oil Cooler Locations 24

3.3 Transmission Secondary Speed Sensor 25

3.4 Selector Shaft 26

3.5 Connector 26

III. Strategies 27

1. Behaviour in Specific Situations 27

1.1 Idle when Drive is Selected 27

1.2 Take Off / Pulling Away 27

1.3 Light Throttle Acceleration in Drive or Sport 27

1.4 Kick Down in Drive or Sport 28

1.5 Emergency Stop 28

1.6 Reverse Running 28

1.7 Fault Mode 28

2. CVT Software 29

3. Transmission Reset and Reference 30

IV. Adaptation Procedures 31

Description Transmission VT1F

Page 4 of 31

Automatic Gearbox – VT1F

Fig. 1: Gearbox and selector mechanism

I. General description VT1F

1. Introduction

The stepless shifting pattern of the transmission provides a very comfortable drive, as well as

having full vehicle performance, available at any time.

Description Transmission VT1F

Page 5 of 31

The advantages of using an automatic transmission of this type are:

- Low engine revolutions at constant speeds.

- Improved emission control/fuel consumption.

- Low noise, vibration and harshness levels.

- Smooth acceleration.

- Flexible driving on mountain roads.

Fig. 2:

CVT box

Fig. 3:

Bell Housing

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