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Bi-helical toothed wheel with variable helix angle and non-encapsulating tooth profile for hydraulic gear apparatuses

A technology of hydraulic gears and hydraulic devices, which is applied in the direction of hoisting devices, components with teeth, portable lifting devices, etc., and can solve problems such as fluid packaging problems that cannot be solved

Active Publication Date: 2018-01-30
SETTIMA FLOW MECHANISMS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] In addition, the tooth profile is involute, the same cross-section as a standard spur gear unit used in a gear pump, so it does not solve the problem of fluid packing between the tooth tip and tooth root

Method used

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  • Bi-helical toothed wheel with variable helix angle and non-encapsulating tooth profile for hydraulic gear apparatuses
  • Bi-helical toothed wheel with variable helix angle and non-encapsulating tooth profile for hydraulic gear apparatuses
  • Bi-helical toothed wheel with variable helix angle and non-encapsulating tooth profile for hydraulic gear apparatuses

Examples

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Embodiment Construction

[0051] With reference to these figures, numeral 1 designates schematically as a whole a gear of the double helical profile type manufactured according to the invention.

[0052] In particular, but not exclusively, this gear is designed for use in hydraulic gearing, and the following description will refer to this specific field of application in order to simplify its description.

[0053] For a better understanding of all aspects of the invention, it is worth noting that the term "cylindrical helix" refers to a curve described by an animated point of continuous circular motion and at the same time a uniform rectilinear motion with a direction perpendicular to the plane of rotation .

[0054] Furthermore, the term "helix pitch" will hereinafter be defined as the distance traveled by the helix generating point after one complete revolution in the axial direction.

[0055] It is an object of the present invention to provide a double helical gear that can be used with the same type...

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Abstract

The invention relates to a bi-helical toothed wheel (1) with non-encapsulating profile (4) for hydraulic gear apparatuses (2), of the type bound to a support shaft (5) to form a driving or driven wheel of said hydraulic apparatus and comprising a plurality of teeth (6) extended with variable helix angle with continuous function in the longitudinal direction, wherein the teeth profile (4) keeps a shape continuity in each cross section thereof. More particularly, each tooth of the toothed wheel is longitudinally split in three zones: initial (A), central (B) and terminal (C) zones, and the central zone (B) has a variable helix angle, while the initial (A) and terminal (C) zones have a constant helix angle. The invention allows to manufacture contra-rotating rotors, having a non-encapsulatingprofile and a helix shape such as to suppress the angular point at the center of the rotors themselves and therefore all the problems related to their machining.

Description

technical field [0001] The present invention relates to a double helical gear having a non-encapsulated tooth profile suitable for engagement in hydraulic gearing. [0002] More specifically, the invention relates to a gear intended to engage non-encapsulated with a gear of the same type in a hydraulic gear unit. [0003] A typical example of a hydraulic gear unit is a rotary positive displacement gear pump. In typical examples, the gear of the present invention finds its best application, and specific reference will be made in the following description. However, the gear of the present invention can also be applied to hydraulic gear motors and / or all hydraulic devices operating via a pair of gear arrangements, which are therefore included within the scope of the present invention. Background technique [0004] As is well known in the art, rotary positive displacement gear pumps generally consist of two gears, in most cases spur-toothed, where the gear connected to the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/08F16H55/17F04C15/00F03C2/08
CPCF01C1/18F04C2/18F01C1/084F04C2/084F04C2/107
Inventor 马纽埃尔·罗西
Owner SETTIMA FLOW MECHANISMS SRL
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