CH676491A5 - Play-free toothed rod drive - has cable disc fixed on shaft supporting pinion - Google Patents
Play-free toothed rod drive - has cable disc fixed on shaft supporting pinion Download PDFInfo
- Publication number
- CH676491A5 CH676491A5 CH3439/88A CH343988A CH676491A5 CH 676491 A5 CH676491 A5 CH 676491A5 CH 3439/88 A CH3439/88 A CH 3439/88A CH 343988 A CH343988 A CH 343988A CH 676491 A5 CH676491 A5 CH 676491A5
- Authority
- CH
- Switzerland
- Prior art keywords
- pinion
- tension element
- disc
- toothed rod
- play
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 239000013013 elastic material Substances 0.000 claims abstract 3
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
Classifications
-
- 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
- F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
- F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
- F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
-
- 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
- F16H57/00—General details of gearing
- F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
-
- 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
- F16H57/00—General details of gearing
- F16H57/12—Arrangements for adjusting or for taking-up backlash not provided for elsewhere
- F16H2057/126—Self-adjusting during operation, e.g. by a spring
- F16H2057/127—Self-adjusting during operation, e.g. by a spring using springs
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Transmission Devices (AREA)
Abstract
The gearbox has a pinion engaging in a toothed rod without play. A draw tension element (4) elastically resilient over at least a part of its length is fixed with one end on a component connected to the toothed rod and with the other end on a disc (6) which is seated on the shaft (1) which supports the pinion (2). The rolling diameter of the tension element (4) on the disc is equal to the engagement of the tension element (4) on the disc is equal to the engagement diameter of the pinion (2). The tension element (4) is made of a substantially non-elastic cable or belt and a tension spring (5) or of an elastic material. The pinion can roll on a locally fixed toothed rod. ADVANTAGE - Weaker drive motors can be used since the tensile force applies a moment on the disc and via the shaft on the pinion to keep the teeth against the toothed rod.
Description
Die Erfindung betrifft ein Getriebe mit einem in eine Zahnstange eingreifenden Ritzel, welche federnd spielfrei gegeneinander verspannt sind.
Derartige Zahnradgetriebe finden unter anderem für die spielfreie Positionierung von computergesteuerten X/Y-Koordinatentischen Verwendung.
In üblichen Antrieben sind zwei Zahnräder vorgesehen, welche durch eine zwischen ihnen angebrachte Feder in Umfangsrichtung gegeneinander verspannt werden, so dass je ein Rad an den entgegengesetzt geneigten Zahnflanken zum Anliegen kommt. Nachteile dieser bekannten Konstruktion sind ein komplizierter Aufbau und die verhältnismässig grosse Masse, welche beschleunigt werden muss.
Ziel der Erfindung ist es, einen spielfreien Zahnstangentrieb zu schaffen, der einfach aufgebaut ist und geringe bewegte Massen aufweist, wodurch schwächere Antriebsmotoren eingesetzt werden können.
Dies wird erfindungsgemäss durch ein mindestens über einen Teil seiner Länge elastisch federnd ausgeführtes Zugelement erreicht, dessen eines Ende an einem mit der Zahnstange verbundenen Bauteil und dessen anderes Ende an einer Scheibe befestigt ist, welche auf der das Ritzel tragenden Welle sitzt, wobei der Abrolldurchmesser des Zugelements auf der Scheibe gleich dem Eingriffsdurchmesser des Ritzels ist.
Es wird also durch die Zugkraft des federnd ausgeführten Elementes ein Moment auf die Scheibe und weiter über die Welle auf das Ritzel aufgebracht, durch welches dessen Zähne dauernd zum Anliegen an die Zahnflanken der Zahnstange kommen.
Gegenüber den bekannten Vorrichtungen kann eine schmälere Zahnstange verwendet werden. Die geringeren Massen und die verminderte Reibung verbessern das Verhalten beim Anfahren und Bremsen und ergeben einen ruhigeren, schwingungsarmen Lauf.
Die Erfindung wird nun anhand der Zeichnung erläutert, welche ein erfindungsgemässes Getriebe im Aufriss und im Grundriss zeigt.
Die Ritzelwelle 1 trägt ausser dem Ritzel 2 eine Scheibe 6. Auf dieser ist ein Ende eines Seiles 4 befestigt, welches durch eine am anderen Ende angreifende Feder 5 dauernd gespannt wird. Der Abrolldurchmesser der Scheibe 6 ist gleich dem Eingriffsdurchmesser de des Ritzels 2.
Rollt nun das Ritzel 2 auf der Zahnstange 3 ab, so wird das Seil 4 auf der Scheibe 6 je nach Bewegungsrichtung auf- oder abgewickelt. Infolge der Gleichheit bleibt das gerade Seilstück mit seinem an der Feder befestigten Ende in Ruhe, so dass auch die Feder keine nennenswerte Längenänderung erfährt. Damit bleibt ein konstanter Seilzug erhalten, welcher die Zahnflanken des Ritzels 2 dauernd mit den Flanken der Zahnstange 3 in Berührung hält.
Die Federkraft muss ausreichen, um beim Anfahren in eine Richtung und beim Bremsen in die entgegengesetzte Richtung ein Abheben der Zahnflanken durch die Beschleunigungskräfte zu verhindern. Beim Anfahren und Bremsen in die andere Richtung bewirken die Beschleunigungskräfte ein zusätzliches Anpressen.
Anstelle der Verbindung eines im wesentlichen nicht elastischen Seiles mit einer Feder könnte auch ein Zugelement verwendet werden, welches als ganzes elastisch ausgeführt ist, also beispielsweise aus Gummi oder Kunststoff besteht und/oder nachgiebig gewebt ist. Auch könnte die Zugfeder durch eine hydraulische oder pneumatische Einheit ersetzt werden.
Mit einem erfindungsgemässen Zugelement könnte auch ein Antrieb spielfrei gemacht werden, in welchem eine Zahnstange durch einen ortsfesten Antrieb längsverschoben wird. In diesem Fall müsste das eine Ende des Zugelementes an der Zahnstange oder an einem mit dieser verbundenen Teil befestigt werden.
The invention relates to a transmission with a pinion engaging in a rack, which are spring-loaded against each other without play.
Such gear transmissions are used, among other things, for the play-free positioning of computer-controlled X / Y coordinate tables.
In conventional drives, two gear wheels are provided, which are braced against one another in the circumferential direction by a spring arranged between them, so that one wheel comes to rest on the oppositely inclined tooth flanks. Disadvantages of this known construction are a complicated structure and the relatively large mass, which has to be accelerated.
The aim of the invention is to provide a backlash-free rack and pinion drive which is simple in construction and has low moving masses, which means that weaker drive motors can be used.
This is achieved according to the invention by means of a tension element which is designed to be resilient over at least part of its length, one end of which is fastened to a component connected to the toothed rack and the other end of which is fastened to a disk which sits on the shaft carrying the pinion, the rolling diameter of the Tension element on the disc is equal to the engagement diameter of the pinion.
A moment is thus applied to the disk by the tensile force of the resilient element and further to the pinion via the shaft, by means of which the teeth constantly come into contact with the tooth flanks of the rack.
Compared to the known devices, a narrower rack can be used. The lower masses and the reduced friction improve the behavior when starting and braking and result in a quieter, low-vibration run.
The invention will now be explained with reference to the drawing, which shows a transmission according to the invention in elevation and in plan.
In addition to the pinion 2, the pinion shaft 1 carries a disk 6. One end of a rope 4 is fastened to this, which is continuously tensioned by a spring 5 acting on the other end. The rolling diameter of the disk 6 is equal to the engagement diameter de of the pinion 2.
If the pinion 2 now rolls on the rack 3, the rope 4 is wound up or unwound on the disk 6 depending on the direction of movement. As a result of the equality, the straight piece of rope with its end attached to the spring remains at rest, so that the spring does not experience any significant length change either. This maintains a constant cable pull that keeps the tooth flanks of the pinion 2 in constant contact with the flanks of the rack 3.
The spring force must be sufficient to prevent the tooth flanks from lifting off due to the acceleration forces when moving off in one direction and braking in the opposite direction. When starting and braking in the other direction, the acceleration forces cause additional pressure.
Instead of connecting a substantially non-elastic rope to a spring, a tension element could also be used which is designed as a whole to be elastic, that is to say, for example, consists of rubber or plastic and / or is flexibly woven. The tension spring could also be replaced by a hydraulic or pneumatic unit.
With a tension element according to the invention, a drive could also be made free of play, in which a toothed rack is longitudinally displaced by a stationary drive. In this case, one end of the tension element would have to be attached to the rack or to a part connected to it.
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT234387 | 1987-09-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH676491A5 true CH676491A5 (en) | 1991-01-31 |
Family
ID=3532587
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH3439/88A CH676491A5 (en) | 1987-09-17 | 1988-09-15 | Play-free toothed rod drive - has cable disc fixed on shaft supporting pinion |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH676491A5 (en) |
DE (1) | DE8811179U1 (en) |
IT (1) | IT1227352B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110248773A (en) * | 2017-03-09 | 2019-09-17 | Abb瑞士股份有限公司 | Static torque regulating device, the industrial robot including the device and the method for adjusting static torque |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0674314A (en) * | 1992-08-24 | 1994-03-15 | Ishida Co Ltd | Effective length reducing device for load spring |
-
1988
- 1988-09-03 DE DE8811179U patent/DE8811179U1/en not_active Expired
- 1988-09-14 IT IT8821935A patent/IT1227352B/en active
- 1988-09-15 CH CH3439/88A patent/CH676491A5/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110248773A (en) * | 2017-03-09 | 2019-09-17 | Abb瑞士股份有限公司 | Static torque regulating device, the industrial robot including the device and the method for adjusting static torque |
CN110248773B (en) * | 2017-03-09 | 2023-05-09 | Abb瑞士股份有限公司 | Static torque adjusting device, industrial robot comprising the device and method for adjusting static torque |
Also Published As
Publication number | Publication date |
---|---|
DE8811179U1 (en) | 1988-12-15 |
IT1227352B (en) | 1991-04-08 |
IT8821935A0 (en) | 1988-09-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased |