Daihatsu Develops a New Eco-Friendly, High Acceleration Performance CVT for Mini Vehicle Use

Jun. 19, 2006

DAIHATSU MOTOR CO., LTD. (Daihatsu) has developed an environmentally friendly, high acceleration performance CVT*1 for minivehicle use, and has commenced in-house manufacturing. Comprising the world's first "input-speed reduction type three-shaft gear train system" and other original components, the new CVT features enhanced fuel efficiency and smooth acceleration performance, with a lightweight, compact body.

1. World's first "input-speed reduction type three-shaft gear train system"

In this system, a reduction gear on the input shaft side of the CVT reduces and reverses speed and rotation.

Features:

(1) Enhanced transmission efficiency

Minimizes transmission loss due to belt dislocation caused by high centrifugal force.

(2) Reduced inertia of variable transmission unit

Increased torque with decreased rotational speed reduces transmission unit inertia.

(3) Fewer parts

No need for speed reduction on CVT output shaft side, thus reducing the number of shafts from 4 to 3.

2. Features of the CVT

Enhanced fuel efficiency

Feature (1) above enhances fuel efficiency by approximately 15% over Daihatsu's conventional automatic transmission vehicles, attaining a class*2 leading fuel efficiency among mini vehicles of the same category.

Smooth acceleration performance

Feature (2) above, together with the use of the world's smallest metal belt*3, increases acceleration performance by approximately 10% over Daihatsu's conventional automatic transmission vehicles, attaining powerful yet smooth acceleration from low to high speeds.

Lightweight and compact

Feature (3) above, combined with the use of the world's smallest metal belt*3, enables a compact CVT ideal for minivehicles.

*1: Continuously Variable Transmission
*2: According to Daihatsu May 2006 survey on 660 cc minivehicle engine class
*3: According to Daihatsu May 2006 survey

CVT

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