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Multi-range continuously variable transmission

A continuously variable transmission, multi-range technology, applied to the transmission device, belt/chain/gear, mechanical equipment, etc., can solve the problems of poor efficiency, decoupling of the transmission device, and inability to drive continuously

Active Publication Date: 2018-01-16
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This means that the efficiency is relatively poor especially in the range where the planet rolls
[0003] Furthermore, known from DE 102 61 990 A1 is a multi-range continuously variable transmission with fixed shiftable gears, for example provided for starting or for top speed, wherein, however, the shifting device is decoupled
Therefore, there is only one stepless range, which does not enable stepless travel in all travel ranges

Method used

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  • Multi-range continuously variable transmission
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Embodiment Construction

[0018] exist figure 1 A simplified cross-sectional view of a multi-range continuously variable transmission according to the present invention is shown in . The multi-range continuously variable transmission 1 is particularly well suited for use in commercial vehicles, since the vehicle is driven at low rotational speeds but with high output-side torque. The multi-range continuously variable transmission 1 is used, for example, in tractors.

[0019] Conventional multi-range continuously variable transmissions have the disadvantage, in particular, of interrupting the force flow during a range change between two operating ranges. This interruption of traction also makes it difficult to switch over when starting a heavily loaded vehicle on an incline. A cost-effective improved shifting between operating ranges is provided by the multi-range continuously variable transmission 1 according to the invention. Here, in particular, full-load switching between these two operating rang...

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Abstract

The invention relates to a multi-range continuously variable transmission having a continuously adjustable transmission and at least two switching stages for forming at least two operating ranges with continuously variable transmission ratios. The invention is characterized by at least one direct gear stage bridged across the transmission, which has a specific transmission ratio for forming a range change between the operating ranges.

Description

technical field [0001] The invention relates to a multi-range continuously variable transmission (CVT) having a continuously adjustable transmission and at least two switching stages for forming at least two The operating range of the stepless transmission ratio. A continuously variable transmission is called a CVT, where the letter CVT stands for continuously variable transmission. Background technique [0002] In order to increase the transmission ratio range of the overall transmission, that is to say its expansion range, it is known from EP 2169277 to arrange a planetary gearshift downstream of the continuously variable transmission. The planetary gear contains a dual range shifter and a reverse shifter. In the case of higher input torques, for example for commercial vehicle applications, the output-side planetary gear must be dimensioned particularly large. This means that the efficiency is relatively poor especially in the range of planetary rolls. [0003] Further...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H37/02
CPCF16H37/021F16H2037/025F16H37/022
Inventor B·瓦尔特
Owner SCHAEFFLER TECH AG & CO KG
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