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Method For Operating A Continuously Variable Transmission Incorporating A Drive Belt

A technology of continuously variable transmissions and transmission belts, which is applied to transmission parts, belts/chains/gears, mechanical equipment, etc., which can solve the problems of low coolant supply temperature and low transmission overall efficiency, and achieve reduced supply flow and allowable supply Effects of temperature increase, cooling effect and/or capacity reduction

Active Publication Date: 2012-11-28
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, it has to be taken into account that the greater the supply flow and / or the lower the supply temperature of the coolant, the lower the overall efficiency of the transmission becomes because of the increased amount of power consumed by the cooling device

Method used

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  • Method For Operating A Continuously Variable Transmission Incorporating A Drive Belt
  • Method For Operating A Continuously Variable Transmission Incorporating A Drive Belt
  • Method For Operating A Continuously Variable Transmission Incorporating A Drive Belt

Examples

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Embodiment Construction

[0016] exist figure 1 In the graph of , the dots represent the corresponding HRC hardness of 25 quench-hardened transverse elements ("specimens"), while the squares represent the corresponding HRC hardness of the same specimens after they were also subjected to extended tempering at 160°C for 400 hours. HRC hardness. The latter conditions are considered to be representative of the prevailing conditions in the transmission during normal operation of the transmission. From the graph, it appears that under these conditions the hardness of the samples does not drop below the commonly applied lower threshold of 58 HRC.

[0017] exist figure 2 In the graph of , the dots represent the corresponding HRC hardness of 25 additional quench-hardened samples, while the squares represent the corresponding HRC hardness of the same samples after they were also subjected to extended tempering at 180° C. for 400 hours. From the graph, it appears that under the latter conditions the hardness ...

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PUM

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Abstract

The invention relates to a method for operating a continuously variable transmission incorporating a drive belt, which transmission further includes a cooling device for supplying a flow of a cooling agent to the drive belt. The method including the step of setting or controlling the said flow such that the temperature of the cooling agent exceeds 90 DEG C, preferably exceeds 100 DEG C and remains under 140 DEG C. This method reduces the effort required for the cooling of the transmission, i.e. improves the transmission efficiency, while still ensuring the continued proper functioning of the drive belt.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 below for operating a continuously variable transmission incorporating a drive belt, said transmission being known in the art for example according to European patent EP-A-1 167 829 . Background technique [0002] The drive belt of such a transmission is typically in the form of a so-called push belt, known per se, for example from European patent EP-A-0 626 526 . Said known push belt comprises steel transverse elements contained within the belt slidingly relative to the periphery of its annular tensile members, which primarily have the function of restraining and guiding the transverse elements . The transverse elements of said known drive belt are made of carbon comprising steel 75Cr1 comprising 0.7% to 0.8% by weight of carbon and typically between 0.35% and 0.55% by weight of chromium. Typically, annular tensile members are also made of steel, especially maraging steel, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H57/04
CPCF16H57/0489
Inventor C·J·M·范德梅尔
Owner ROBERT BOSCH GMBH