Machine element or mechanism – Gearing – Teeth
Patent
1996-05-09
1997-11-04
Herrmann, Allan D.
Machine element or mechanism
Gearing
Teeth
418150, 418191, F16H 5508, F16H 3936, F01C 120
Patent
active
056827938
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This Invention concerns a pair of engaged rotors. Either rotor possesses respectively involute teeth that can mesh with the other and rotate, on one rotor there is working tooth whose height is larger than that of the involute tooth, and on other rotor there is engaged tooth groove whose form corresponds with that of the working tooth so that they can engage with each other in course of rotation. The form of the said working tooth and its corresponding groove are made up of special curves. The said pair of such rotors can be applied as rotor of fluid pumps, vacuum pumps and/or fluid motors (liquid motor or gas motor), as well as the rotor of special rotary internal combustion engines.
BACKGROUND OF THE INVENTION
The existing gear pump is structured in a pair of toothed wheels called rotors meshing with each other and rotating in the casing. This kind of pump pumps in or out fluid through the cavity between the teeth. Due to the fact that the cavity of the pump is not continuous and its bulk is not large enough and that there always survives some compressed fluid between the meshed teeth, the gear pump is not applicable in pumping gases.
A PCT application for "Rotatory Internal Combustion Engine" (International application No. PCT/BR90/00008; International application date: Aug. 16th, 1990; International patent No. WO90/02888; International patent publishing date: Mar. 7, 1991) publishes a kind of rotor used in the rotary internal combustion engine. This rotor, however, doesn't possess meshed and rotating involute teeth and the application itself gives no function formula describing the form of the working tooth and its corresponding tooth groove.
German patent application (Application No. DT.A.2330992) discloses a kind of rotor, which does possess the meshed and rotating involute teeth, working tooth and engaged tooth groove. But, like the PCT one, it publishes no function formula describing the form of the working tooth and its corresponding tooth groove. It doesn't give any detailed information on the structure of the working tooth and the tooth groove, either. In addition, the uniform rotation velocity cannot be assured when they mesh with each other.
The present invention, however, aims to present a pair of engaged rotors, along whose excircle circumferences there exist the involute teeth, the working teeth and its corresponding tooth grooves which mesh appropriately with each other and rotate, and the form of the latter two are defined by special function formulae, when the working tooth meshes with the engaged tooth groove and rotates, they have the same characteristic of equal circumferential rotation as involute tooth.
SUMMARY OF THE INVENTION
The present invention presents a pair of engaged rotors which consist of an engaged wheel, along whose excircle circumference there exist the involute teeth and the engaged tooth grooves, and of a working wheel, along whose excircle circumference there exist the involute teeth and the working teeth. The height of the working tooth is larger than that of the involute tooth and the depth of the engaged tooth groove is also larger than that of the interval between the involute teeth. The pair of rotors, which can engage with each other and rotate in a casing, characterized in that, following function formula: ##EQU1## the curve of the addendum circle thickness of the working tooth is defined by the arc corresponding to the included angle 2.PSI., with the circle centre of the working wheel as the center and with R.sub.2 as the radius. The formula is as follows: ##EQU2## the form of the said engaged groove on the engaged wheel is defined by the following function formula: ##EQU3## the bottom curve of the engaged groove is defined by the arc included by the angle (2i.PSI.) corresponding to the included angle 2.PSI. of the addendum thickness, and with the circle centre (which is that of the engaged wheel) as the circle center, and with the radius (R.sub.a +R.sub.b -R.sub.2) as the radius. The formula is: ##EQU4## Along the circumference
REFERENCES:
patent: 2870752 (1959-01-01), Breelle
patent: 3574491 (1971-04-01), Martin
patent: 3782340 (1974-01-01), Nam
patent: 4747762 (1988-05-01), Fairbairn
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