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Drive belt provided with a ring set with steel rings having a nitride layer and method for determining a thickness of such a nitride layer

A technology of nitrided layer and transmission belt, which is applied in the field of transmission belt, can solve the problems of not being directly applicable or not suitable for transmission belt without further consideration

Active Publication Date: 2015-09-02
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, the applicant was able to find from these data that the above common knowledge does not in fact apply to drive belt steel ring assemblies, at least not directly, without any further consideration

Method used

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  • Drive belt provided with a ring set with steel rings having a nitride layer and method for determining a thickness of such a nitride layer
  • Drive belt provided with a ring set with steel rings having a nitride layer and method for determining a thickness of such a nitride layer
  • Drive belt provided with a ring set with steel rings having a nitride layer and method for determining a thickness of such a nitride layer

Examples

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Embodiment Construction

[0027] figure 1 Shown is the center section of an existing continuously variable transmission or CVT typically applied in a motor vehicle's drive train between its engine and drive wheels. The variator comprises two pulleys 1, 2 each provided with two conical pulley discs 4, 5 in which a substantially V-shaped groove is defined Between 4, 5, one of the two conical pulley disks 4, 5 can be axially aligned along the corresponding pulley shaft 6, 7 on which the disk 4 is arranged. to move. A drive belt 3 surrounds the pulleys 1 , 2 to transmit the rotational movement ω and the accompanying torque T from one pulley 1 , 2 to the other pulley 2 , 1 . The variator usually also comprises an activation device which exerts on said at least one disc 4 an axially oriented clamping force Fax directed towards the respective other pulley disc 5, so that the belt 3 is clamped on the disc 4, the disc between 5. And, the transmission (speed) ratio between the rotational speed of the driven ...

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Abstract

A novel method of determining the thickness of the nitride layer (NL) of a heat treated steel ring (32) is provided, which steel ring is applied as part of a ring set composed of a number of concentrically nested steel rings in a drive belt for a continuously variable transmission. The method entails applying the steps of (i) performing a break strength test on the steel ring, of (ii) measuring the thickness of the resulting brittle fracture layer (BP) and of (iii) determining the thickness of the nitride layer that corresponds to the measured thickness of the brittle fracture layer from a predetermined reference for the base material of the steel ring concerned, such as a look-up table or an equation that links these two parameters together.

Description

Background technique [0001] The present disclosure relates to a drive belt used in a well-known pulley-type continuously variable transmission or CVT commonly applied to motor vehicles. A well-known type of drive belt, also known in the prior art as a push belt, is described in detail in EP-A-1403551. Known drive belts comprise a plurality of steel segments provided with at least one, but usually two, recesses each receiving a belt loop set, wherein each loop set consists of a plurality of flexible belts nested concentrically with each other. Composed of steel rings. In the prior art, the steel segments are also referred to as transverse elements, the steel rings are also referred to as hoops, hoops or endless belts, and the ring sets are also referred to as annular tensioners or carrier. In existing types of drive belts, the transverse elements are not connected to the ring set, but slide along the circumference of the ring set during operation of the CVT. The individual ...

Claims

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Application Information

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IPC IPC(8): F16G5/16
CPCF16G5/16
Inventor B·彭宁斯
Owner ROBERT BOSCH GMBH
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