System for preventing gear hopout in a tooth clutch in a vehicle transmission

Active Publication Date: 2011-07-21
VOLVO LASTVAGNAR AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0001]The present invention relates to vehicle transmissions, and more particularly to a system for preventing gea

Problems solved by technology

Unfortunately, the material volume that can be plastically deformed in a rolling operation is small.
There are some applications where conventionally made back-tapered clutch teeth have been shown to have insufficient self-retaining action.
Some retarder operating conditions have shown to cause problems in a planetary range section as in FIG. 2.
This urge for relative motion may turn into an unstable state if the friction between the contacting clutch teeth is large and the self-retaining action from for instance back taper is insufficient.
Thereby, no torque can be transferred by the rang

Method used

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  • System for preventing gear hopout in a tooth clutch in a vehicle transmission
  • System for preventing gear hopout in a tooth clutch in a vehicle transmission
  • System for preventing gear hopout in a tooth clutch in a vehicle transmission

Examples

Experimental program
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Embodiment Construction

[0037]When studying FIG. 3 and FIG. 4 it can be noted that the misalignment of the engaging sleeve 351 will lead to a varying degree of engagement along the periphery with the clutch teeth of the second gearwheel 354. The lowest degree of engagement is where the axial gap 365 is largest. During rotation, this varying degree of engagement will require a relative motion between the clutch and spline teeth in contact of the engaging sleeve 351, input shaft 352 and second gearwheel 354. In order to prevent gear hopout, it is vital that this relative motion takes place. Thereby, friction will occur between the teeth in contact. In FIG. 4, the friction component of the sleeve clutch force 363 is referred to as 363f. Similarly, the friction component of the sleeve spline force 364 is referred to as 364f. In order to enable the relative motion between the contacting teeth, substantially the parallel component 363p of the sleeve clutch force 363 must be larger than the sum of the friction fo...

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Abstract

A system is provided for preventing gear hopout in a tooth clutch in a vehicle transmission, the tooth clutch including an engaging sleeve having sleeve clutch teeth. The tangent function for at least one of driving back-taper angle and braking back-taper angle is larger than the average value of clutch coefficient of friction and spline coefficient of friction multiplied by the sum of unity and the ratio of clutch teeth pitch diameter and spline teeth pitch diameter.

Description

BACKGROUND AND SUMMARY[0001]The present invention relates to vehicle transmissions, and more particularly to a system for preventing gear hopout in tooth clutches that are subjected to misalignment due to forces acting on rotating parts they connect.BACKGROUND OF THE INVENTION[0002]Tooth clutches are frequently used in stepped vehicle transmissions to engage and disengage the gears. A tooth clutch can rotatably connect a main part with a substantially coaxial connectable part. Normally, an engaging sleeve is used as an interconnecting member between these two parts. This engaging sleeve is often rotatably fixed but axially moveable with respect to said main part by means of, for instance, splines. On the engaging sleeve there are clutch teeth at the end that faces the connectable part. These clutch teeth need to be compatible with corresponding clutch teeth on the connectable part. These two sets of clutch teeth can be brought into mesh with each other by moving the engaging sleeve ...

Claims

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Application Information

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IPC IPC(8): F16D11/10
CPCF16D11/10F16D2023/0675F16D2011/008F16D2011/002
Inventor HEDMAN, ANDERSERHARO, HANSKARLSSON, BENGT
Owner VOLVO LASTVAGNAR AB
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