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Guide for gear rack

IP.com Disclosure Number: IPCOM000245429D
Publication Date: 2016-Mar-09
Document File: 3 page(s) / 65K

Publishing Venue

The IP.com Prior Art Database

Abstract

This technical disclosure relates to the slewing system for a forestry machine boom consisting of a pinion and two hydraulically powered gear racks which apply force on a pinion column. To avoid misalignment between the pinion and the gear rack, a guide is placed between the pinion and the gear rack. This system has only 3 elements with tolerances (pinion-guide-gear rack) and the guide between the pinion gear tip and the gear rack root gives a precise way to control the minimum distance and angle between the pinion gear and the gear rack.

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Page 01 of 3

Title: Guide for gear rack

Abstract:

This technical disclosure relates to the slewing system for a forestry machine boom consisting of a pinion and two hydraulically powered gear racks which apply force on a pinion column. To avoid misalignment between the pinion and the gear rack, a guide is placed between the pinion and the gear rack. This system has only 3 elements with tolerances (pinion-guide-gear rack) and the guide between the pinion gear tip and the gear rack root gives a precise way to control the minimum distance and angle between the pinion gear and the gear rack.

Drawings:

FIG. 1

FIG. 2



Page 02 of 3

Background:

The slewing system of a forestry machine boom consists of a pinion and two hydraulically powered gear racks which apply force on the pinion column. A typical damage of this system is high abrasion found in the gear racks and pinion.

The damage in these parts suggests strongly that there has been a misalignment between the pinion and the gear rack.

This is plausible because the gear racks can rotate freely along their longitude axis. There is no guidance to keep tooth alignment on a certain position except the mesh between the pinion and the gear rack teeth. As can be seen from damaged parts this solution is not working.

A typical solution is a fixed alignment of the gear rack. Support and thus alignment is taken from the gear housing. This solution anyhow cannot compensate misalignment coming from pinion bearings which is rather typical for forestry booms.

Brief Description of drawings:

FIG. 1 shows the arrangement of a proposed guide between a gear rack and pinion assembly in a slewing system.

FIG. 2 shows the g...