ITCS990019A1 - HELICAL GEAR WHEELS WITH VARIABLE RADIUS AND CONSTANT THRUST ANGLE. - Google Patents
HELICAL GEAR WHEELS WITH VARIABLE RADIUS AND CONSTANT THRUST ANGLE. Download PDFInfo
- Publication number
- ITCS990019A1 ITCS990019A1 IT99CS000019A ITCS990019A ITCS990019A1 IT CS990019 A1 ITCS990019 A1 IT CS990019A1 IT 99CS000019 A IT99CS000019 A IT 99CS000019A IT CS990019 A ITCS990019 A IT CS990019A IT CS990019 A1 ITCS990019 A1 IT CS990019A1
- Authority
- IT
- Italy
- Prior art keywords
- gear wheels
- variable radius
- helical gear
- motion
- constant thrust
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000021615 conjugation Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/08—Profiling
- F16H55/084—Non-circular rigid toothed member, e.g. elliptic gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H35/00—Gearings or mechanisms with other special functional features
- F16H2035/003—Gearings comprising pulleys or toothed members of non-circular shape, e.g. elliptical gears
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
- Gears, Cams (AREA)
Description
DESCRIZIONE DELL'INVENZIONE INDUSTRIALE DAL TITOLO: DESCRIPTION OF THE INDUSTRIAL INVENTION TITLE:
Ruote dentate elicoidali a raggio variabile e ad angolo di spinta costante. Helical gear wheels with variable radius and constant thrust angle.
Descrizione generale del campo di intervento dell’invenzione· General description of the field of intervention of the invention
Le ruote dentate a raggio variabile trovano svariate applicazioni, ma Fino ad ora la loro progettazione era estremamente difficoltosa, ed erano spesso costruite per taglio delle stesse con. dentatrici i cui avanzamenti erano controllati indipendentemente sui due assi, in modo da generare profili coniugati, senza tuttavia che fosse determinabile a priori la continuità di trasmissione del moto. Gear wheels with variable radius find various applications, but until now their design was extremely difficult, and they were often built by cutting them with. gearboxes whose advances were independently controlled on the two axes, so as to generate conjugated profiles, without however determining the continuity of motion transmission a priori.
La recente domanda di Brevetto Italia No. CS96A000010, depositato 25/7/96, aveva introdotto la possibilità di progettare ruote dentare a raggio variabile e ad angolo di spinta costante, attraverso l’integrazione di un'equazione che rappresentava l'ingranamento di due dentature ad angolo di spinta costante se le primitive del moto erano date ed erano continue con la loro derivata. Tali dentature potevano poi essere costruite ricorrendo a semplici fresatrici a controllo numerico. The recent Italian Patent Application No. CS96A000010, filed 25/7/96, had introduced the possibility of designing variable radius and constant thrust angle gear wheels, through the integration of an equation that represented the meshing of two teeth with constant thrust angle if the motion primitives were given and were continuous with their derivative. These gears could then be built using simple numerically controlled milling machines.
Un successivo sviluppo numerico, mai fino ad ora pubblicato, aveva consentito di ricavare ruote a raggio variabile anche a partire da primitive del moto note per punti, facendo uso dellecosì dette splines. A subsequent numerical development, never published until now, had made it possible to derive wheels with variable radius also starting from motion primitives known by points, making use of the so-called splines.
Tuttavia tutte queste ruote erano sino ad oggi a denti diritti, il che poteva dare dei problemi di continuità del moto non indifferenti, o quanto meno costringevano all'usó di elevati angoli di spinta. Vantaggio però delle ruote costruite con il metodo illustrato nel brevetto e delle quali si era richiesto brevetto era che la possibilità di controllare la continuità del moto della ruota prima della costruzione, nonché quella di poterne fare anche una verifica di resistenza sempre prima della costruzione. However, all these wheels until now had straight teeth, which could cause problems of continuity of motion that were not indifferent, or at least forced the use of high thrust angles. However, the advantage of the wheels built with the method illustrated in the patent and for which a patent was requested was that the possibility of checking the continuity of the motion of the wheel before construction, as well as being able to also make a resistance check always before construction.
Convenzionalmente, le ruote elicoidali possono essere pensate come delle ruote dentate cilindriche a gradini nelle quali la dimensione del gradino diviene infinitamente piccola. Nelle mote dentate elicoidali tradizionali la generazione di tali ruote può essere facilmente messa a fuoco, pensando di far ruotare rigidamente ognuno di questi gradini di un certo angolo in modo tale che ogni fianco dei denti formi delle eliche che si avvolgono sul cilindro di base. Nel nostro caso non si può parlare di cilindro, ma la spirale dovrebbe avvolgere un solido ottenuto per estrusione delle primitive. Conventionally, helical wheels can be thought of as stepped cylindrical gear wheels in which the step size becomes infinitely small. In traditional helical toothed wheels, the generation of these wheels can be easily focused, thinking of making each of these steps rigidly rotate by a certain angle in such a way that each flank of the teeth forms helices that wind on the base cylinder. In our case we cannot speak of a cylinder, but the spiral should wrap around a solid obtained by extrusion of the primitives.
Quindi è evidente che la rotazione rigida del gradino immaginario porterebbe alla formazione di un solido dalla forma irregolare (il raggio, per un dato angolo, varierebbe con la profondità) il quale metterebbe perciò in contatto contemporaneamente punti nei quali il rapporto di trasmissione risulta essere diverso e quindi anche le velocità periferiche anche diverse. Risulta chiaro, quindi che le ruote dentate a rapporto di trasmissione variabile non si possono pensare con la classica procedura delle mote tradizionali. Therefore it is evident that the rigid rotation of the imaginary step would lead to the formation of a solid with an irregular shape (the radius, for a given angle, would vary with the depth) which would therefore put in contact at the same time points in which the transmission ratio is different. and therefore also the peripheral speeds also different. It is therefore clear that variable transmission ratio gear wheels cannot be conceived with the classic procedure of traditional wheels.
La presente invenzione invece, facendo uso della succitata equazione dell'ingranamento, applicata facendo nuove integrazioni a partire da punti posti lungo le primitive del moto a vari valori di angolo, simmetrici rispetto all'angolo assunto come incrocio tra il profilo del dente e la primitiva del moto, permette di calcolare e quindi di costruire i profili di ruote dentate elicoidali che incrementano l'arco di azione delle stesse assicurandone il regolare ingranamento. Se sono noti infatti i punti coniugati corrispondenti ad un determinato angolo di rotazione delle due primitive, lungo due profili di diverso punto di partenza, allora risulteranno anche coniugati tutti i punti giacenti lungo il segmento che congiunge detti punti. Non solo, ma le superfici di contatto saranno localmente ortogonali all'angolo di spin The present invention, on the other hand, making use of the aforementioned meshing equation, applied by making new additions starting from points placed along the motion primitives at various angle values, symmetrical with respect to the angle assumed as the intersection between the tooth profile and the primitive of motion, it allows to calculate and therefore to construct the profiles of helical gear wheels that increase the arc of action of the same ensuring their regular meshing. In fact, if the conjugate points corresponding to a determined angle of rotation of the two primitives are known, along two profiles with different starting points, then all the points lying along the segment joining said points will also be conjugated. Not only that, but the contact surfaces will be locally orthogonal to the spin angle
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT99CS000019 IT1314702B1 (en) | 1999-12-15 | 1999-12-15 | VARIABLE SPOKE GEAR WHEELS AND PUSHING ANGLE. |
PCT/IT2000/000524 WO2001044693A1 (en) | 1999-12-15 | 2000-12-15 | Variable radius helical gears |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT99CS000019 IT1314702B1 (en) | 1999-12-15 | 1999-12-15 | VARIABLE SPOKE GEAR WHEELS AND PUSHING ANGLE. |
Publications (2)
Publication Number | Publication Date |
---|---|
ITCS990019A1 true ITCS990019A1 (en) | 2000-03-15 |
IT1314702B1 IT1314702B1 (en) | 2002-12-31 |
Family
ID=11348388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT99CS000019 IT1314702B1 (en) | 1999-12-15 | 1999-12-15 | VARIABLE SPOKE GEAR WHEELS AND PUSHING ANGLE. |
Country Status (2)
Country | Link |
---|---|
IT (1) | IT1314702B1 (en) |
WO (1) | WO2001044693A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1371848B1 (en) * | 2002-06-12 | 2006-01-04 | Mario Antonio Morselli | Gear pump with spline function generated gear profile |
US6887055B2 (en) | 2002-10-25 | 2005-05-03 | Mario Antonio Morselli | Positive-displacement rotary pump |
FR2871541B1 (en) * | 2004-06-14 | 2006-08-04 | Jean Marc Baggio | START-UP ASSISTING SYSTEM USING VARIABLE-RAYED-SPEED WHEELS |
US7892129B2 (en) | 2006-06-08 | 2011-02-22 | Vmt Technologies Llc | Variable speed transmission with variable orbital path |
US8109852B2 (en) | 2006-06-08 | 2012-02-07 | Vmt Technologies Llc | Variable speed transmission with rotating and orbiting drive gears |
US9188205B2 (en) | 2009-09-08 | 2015-11-17 | Gary D. Lee | Moon gear assembly |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB561067A (en) * | 1942-10-30 | 1944-05-03 | Paul Grodzinski | Improvements in eccentric gear mechanism |
-
1999
- 1999-12-15 IT IT99CS000019 patent/IT1314702B1/en active
-
2000
- 2000-12-15 WO PCT/IT2000/000524 patent/WO2001044693A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
IT1314702B1 (en) | 2002-12-31 |
WO2001044693A1 (en) | 2001-06-21 |
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