Modular CVT design concept for niche applications · 2015-08-04 · one, two or three powersplit ranges Key element is a twin planetary unit at transmission output. Use of axial piston

VDS Getriebe GmbH | Gewerbepark 6| 4493 Wolfern | Tel. +43 (0)7253 88080-0 | Fax +43 (0)7253 88080-50 | Mail: [email protected] | www.vds-getriebe.at

Modular CVT

design concept

for niche applications

Gerhard HörmannVDS Getriebe GmbH

Gewerbepark 6, A-4493 WolfernTel.: +43 7253 88080-0 Fax: +43 7253 [email protected] www.vds-getriebe.at

June 20th,2012

2nd VDI-conference„Transmissions in Mobile Machines“

General view

Introduction

Function VTP – Transmission

Status of development VTP transmission

VTP Basic module for niche applications 70-100 kW

Examples for different vehicles

Summary

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June 20th,2012

2nd VDI-conference„Transmissions in Mobile Machines“ 3

Market situation:

There are many special vehicles with engine power 100 kW requiring CVT

transmissions.

The challenges are low production numbers and specific installation

requirements in the different vehicles.

Target:

To provide a CVT transmission module for

niche applications.

The module shall be dimensioned for

vehicle power ranges up to 100kW.

The available VTP transmission 1RH2F for

transporters defines the base for the

development of the basic module.

Introduction

June 20th,2012


VTP transmission is a continuously variable transmission based on the

principle of hydrostatic mechanical powersplit with

pure hydrostatic drive at low speeds

one, two or three powersplit ranges

Key element is a twin planetary unit at transmission output.

Use of axial piston hydros as compact units or as separate components.

Shifting from pure hydrostatic gear in first gear reverse and first gear

forward is done at synchronous speeds.

Shifting from first to second gear forward

is done with friction clutches by simultaneously

compensating the shifting gap with the hydro.

Functionality VTP transmission

June 20th,2012


VTP transmission - components

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Twin planet gear

Planetary Gear 2Reverse of outputspeed by double

planets when ginggearH2 is connected tohousing

Gearset 1, Clutch K1

Gearset 2, Clutch K2

Reverse gear, Clutch KR

Hydrostatic unitHydropump + Hydromotorback to back or separate units

Drive

Hydropump

Inputshaft

Sun gears S1 and S2Driven by hydromotor

Output:

Planetary carrier

Planetary Gear 1Ringgear H1 connected to hollow shaft, driven by

gearsets 1, 2, R

June 20th,2012


Animation VTP transmission 1RH2F

June 20th,2012


Rotation speed chart VTP 1RH2F

Hydrostatic gearPower split gear reverse 1st powersplit gearforward

Shifting done at synchronous speeds

Shifting done byfriction clutches with

shifting gapcompensation

2nd powersplit gearforward

Hydrostatic gearPower split gear reverse 1st powersplit gearforward

Shifting done at synchronous speeds

Shifting done byfriction clutches with

shifting gapcompensation

2nd powersplit gearforward

June 20th,2012


Advantages VTP transmission

Shifting from hydrostatic gear to powersplit gears at

synchronous speeds.

No interruption of drawbar pull.

Increased gear ratio in powersplit gears due to double planetary

unit.

Just two powersplit gears required for achieving sufficient

maximum speed with reasonable hydros.

High efficiency due to small hydros and low speed differences in

open friction clutches even at high travel speeds.

Robust, cost effective transmission design.

Simplified transmission versions available by modular

transmission concept.

June 20th,2012


H1F 1RH1F 1RH2F H2F

Versions VTP transmission

June 20th,2012


Status VTP transmission

Results of functional and endurance

tests show best performance

VTP transmissions available in test

vehicles Version 1RH2F

Final tests and preparations for

series production in process

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Efficiency measurement

June 20th,2012



All these vehicles have similar requirements :

Input power: 70-100kW

Rated input speed: 2200 – 3600 rpm

CVT function preferable

Production numbers of 25 up to 200

units per year

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June 20th,2012


Lockable longitudinal differential

Output area can be adapted according to specific customer requirements.Components e.g. differential should be taken over from mass production drivelines.

T/M input area adapted to fit into specific vehicles-Input speed adaptation-PTO drives-Offset requirements

VTP- basic module

Power input also possible from rear side

Rotation of the rear housing provides high flexibility in integration.


June 20th,2012


VTP Basic module

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Versions H1F, 1RH1F or H2F can be made available.

Variation of gear ratios of the 2 powersplit ranges

Adjustment of the output gear ratio according to actual requirements.

Clutch shaft, counter shaft, planetary gearset, housing are identical at all versions.

Plug in gear for reverse drive.

June 20th,2012


Main dimensions VTP transmission module / technical data

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Gear type Gear Mod ule VTP450

Input torque max 450 Nm

Output torque max 1700 Nm

Range o f ratio ∞∞∞∞ to 0,4 (CVT)

Hydrostatic concept External single un its

June 20th,2012


VTP base module + adapter gears at input and output side

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VTP Base Module

Engine flange housing

Pump drive gear

Pump/ motor for VTP variator

system

Input housings(different versions)

Dropbox plusdifferential

June 20th,2012


Transmission Configurations

Tow Tractor IMunicipal I

High mobility vehicle I

Municipal IITow Tractor I

High mobility vehicle II

June 20th,2012


Configuration: Long version with drive through pump

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Application: High Mobility Vehicle

Configuration: Module VTP H2F

Axial piston pump 45 cc – drive through

Variable axial piston motor 45 cc

Dropbox including differential

June 20th,2012


Conclusion

VTP transmission is available in 1RH2F configuration with

back-to-back hydro integrated. Test results show best

performance in function and efficiency.

This transmission defines the base for a VTP module with

external hydropump and hydromotor.

The VTP module comprehends all mechanical and electronic

parts and components required to achieve CVT function. This

provides maximum configuration flexibility for a wide range of

applications and vehicles.

Due to its modular construction and the use of standard

variators, the transmission can be adapted with affordable

investment to meet specific conditions regarding installation or

application.

Documents

Modular CVT design concept for niche applications · 2015-08-04 · one, two or three powersplit ranges Key element is a twin planetary unit at transmission output. Use of axial piston