EP1012492A1 - Axial-to-rotary motor having great gear reduction - Google Patents
Axial-to-rotary motor having great gear reductionInfo
- Publication number
- EP1012492A1 EP1012492A1 EP98943130A EP98943130A EP1012492A1 EP 1012492 A1 EP1012492 A1 EP 1012492A1 EP 98943130 A EP98943130 A EP 98943130A EP 98943130 A EP98943130 A EP 98943130A EP 1012492 A1 EP1012492 A1 EP 1012492A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- drive belt
- piston
- axial
- yoke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- F16H19/06—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 flexible members, e.g. an endless flexible member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
Definitions
- the present invention generally relates to an apparatus for transforming a reciprocating movement of a reciprocatable motor of piston-cylinder type, like a pneumatic motor, a gas motor or a hydraulic motor to a constantly rotating movement in one and the same direction of one or more output shafts, and the invention is more particularly directed to such an axial-to-rotary motor in which there is used a drive belt extending over a first pulley which is fixed mounted in relation to the cylinder part of the axially reciprocatable motor and a second pulley which is mounted spaced from the axial motor, and in which the piston rod end of the reciprocatable motor is connected to a yoke which, with outer frames thereof, surrounds the two paths of the drive belt, and which comprises a coupling means, preferably a ratchet and pawl means which, at the active expelling stroke of the piston, provides a driving against one of the drive belt paths, and which, at the return stroke of the piston, provides a driving against the second drive belt path.
- a coupling means
- An apparatus for transforming a reciprocating movement to a rotating movement, or vice versa is known from the Swedish laid out publication 433.393, which discloses an axial-to-rotary transforming apparatus, in which an endless cog belt is actuated by a reciprocatally moving slide and comprising a ratchet wheel having three cog segments provided at an angle of 1 20° from each other and each having a few cogs for co-operation with the cog belt, and which cog wheel is adapted to rotate a certain distance at each end position, whereby the cogs change contact from one cog belt path to the other cog belt path.
- a disadvantage with said apparatus is that the cog belt is moving at the moment when the ratchet wheel changes contact between the two cog belt paths, whereas the slide is still standing. This leads to the appearance of a non desired play in the rotary movement.
- said known apparatus is not formed so that it can be used in combination with a pneumatic piston-cylinder apparatus.
- the driving takes place from the shaft end of the reciprocatable motor, and the drive force from the cylinder controls the change of operation while the piston rod is moving, and therefore there will be very little, if any, interruption in the drive function.
- the engagement force is determined by the magnitude of counter force emanating from the output shaft or shafts, that is by the actual load on the output shaft or shafts. This is accomplished in that one or more ratchets or pawls of the coupling means clamps the drive belt safely against the inner surface of the yoke.
- the greater counter force is applied to the output shaft the greater force is applied between the pawl or pawls and the yoke. Thanks to this construction it is possible to provide a fully effective function even using a smooth of only slightly fluted drive belt, for instance a reinforced drive belt having a rough surface, or even a conventional V-belt.
- the piston rod end of the reciprocatable motor is connected to a yoke which surrounds the two paths of the drive belt, which yoke encloses two opposed ratchet/pawl means, whereby one of said ratchet means provides a fixed clamping of a first one of the drive belt paths between said ratchet/pawl means and the inner surface of an outer frame of the yoke at the active expelling stroke of the piston, and thereby a driving of drive belt, corresponding to the expelling stroke of the reciprocatable motor, and in which the other ratchet/pawl means, at the return stroke of the piston, provides a driving against the second drive belt path, whereby the drive belt will move in one and the same direction at both piston movement directions, and whereby the shafts of the two pulleys will rotate in one and the same direction.
- the inner sides of the yoke frame are formed with a friction increasing surface, for instance a fluted or otherwise formed inner surface.
- the drive belt can be formed with a friction increasing outer surface, for instance a fluted outer surface.
- the invention also includes the possibility of forming the inner sides of the yoke with inner cog segments and the forming the outer side of the drive belt with outer cogs. Normally it is, however, quite sufficient to use a drive belt not having any cogs, even a V-belt.
- the characterizing feature of the invention is that the output shafts of the pulleys are formed with gears which are surrounded by a drive wheel having inner cogs or teeth and which is driven by the gears of the pulleys, and the shaft of which acts as a final shaft of the apparatus. Thereby said final shaft of the apparatus gets a strongly reduced rotation speed and thereby exerts a correspondingly high torque transmittance.
- the large output drive wheel acts as a type of fly wheel which overbridges the slight interruption in the driving appearing when the reciprocatable axial motor changes direction from expelling movement to retraction movement. Thereby the output wheel gets an even and practically constant rotation speed.
- figure 1 shows an embodiment of an apparatus according to the invention, for sake of clearness in a partly cut open condition.
- Figure 2 shows an alternative embodiment of a twin system comprising two pneumatic axial motors.
- Figure 3 is a cross section view along line Ill-Ill of figure 1 .
- Figure 4 is a partial view in an enlarged scale of the drive system of the apparatus including the yoke, and figure 5 shows how the yoke has been rotated 1 80° along its longitudinal axis, thereby providing a reversing of the actuation direction of the drive belt.
- axially reciprocatable motor will in the following be referred to as a pneumatic motor. It is, however, to be understood that the specification, claims and drawings also include other types of motors like gas motors or hydraulic motors.
- the apparatus shown in figure 1 comprises a pneumatic axial-to-rotary motor which co-operates with a large output wheel, and which apparatus comprises a pneumatic piston-cylinder arrangement 1 having a stationary cylinder 2 and a reciprocatable piston rod 3.
- the cylinder 1 carries, at the free end thereof, a pulley 4 mounted in a pulley holder 5.
- a second pulley 6 is mounted in a stationary pulley holder 7 spaced from the pneumatic piston- cylinder arrangement 1 .
- Each of the first pulley 4 and the second pulley 6 is mounted on a rotary output shaft 8 and 9, respectively, and each said output shafts carries a gear (cog wheel) 1 0 and 1 1 , respectively.
- An endless belt 1 2 extends over the two pulleys 4 and 6, which belt 1 2 can be a cog belt, a reinforced smooth belt, a V-belt, a chamfered or otherwise treated belt, preferably formed with an outer surface having a friction increasing surface covering.
- the belt operates with an upper and a lower drive belt path 1 2a and 1 2b, respectively.
- the two belt paths 1 2a and 1 2b are surrounded by a yoke 1 3 which is fixed anchored at the outer end of the piston rod 3 and which is formed with an upper frame part 1 4a and a lower frame part 14b inside which frame parts the belt paths 1 2a and 1 2b are slidable.
- a double acting ratchet means comprising an upper, angularly formed ratchet or pawl 1 5 which is rotatable about a pin 1 6 which is mounted at the end of the yoke located closest to the piston rod 3, and a second, angularly formed ratchet or pawl 1 7 which is rotatable about a pin 18 which is mounted adjacent the opposite end of the yoke.
- the ratchets or pawls 1 5 and 1 7 are biassed in opposite directions by a double acting spring 1 9 which is mounted between said pawls.
- the upper pawl 1 5 will, upon expelling of the piston rod 3, be forced into engagement with the inner side of the upper belt path 1 2a by the piston rod 3 of the pneumatic motor with a pressure which is proportional to the load which is applied to the output shaft or shafts 8 and 9, and which is increased to the same extent that the load on the rotation shaft is increased.
- the belt path 1 2a is thereby pressed against the inner side of the upper yoke frame part 14a and is kept clamped thereto.
- the belt can be formed with a friction increasing surface covering, and the inner side of the outer frames 14a and 14b can be fluted of correspondingly formed with a friction increasing surface.
- the lower pawl 1 7 will, at the same time, slide free of force, against the inner side of the lower belt path 1 2b.
- the apparatus may, as shown in figure 2, be formed with two or more pneumatic axial motors which act in common on the output shafts 8 and 9 and on the shaft 21 of the outer ring 20, but in which the yokes 1 3 and 1 3' of the respective axial motors are displaced a slight distance in relation to each other on the drive belts 1 2, 1 2' .
- the apparatus For providing a very high torque of the output shaft the apparatus is formed so that the gears 1 0 and 1 1 on the shafts 8 and 9 are surrounded by a large wheel 20 having inner teeth which co-operate with the gears 10 and 1 1 of the axial motor or motors, and the output shaft 21 of which gets a strongly gear reduced rotational speed and a corresponding possibility of transferring high torques.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9703231A SE510009C2 (en) | 1997-09-08 | 1997-09-08 | Device for converting a reciprocating motion into a rotary motion |
SE9703231 | 1997-09-08 | ||
PCT/SE1998/001536 WO1999013244A1 (en) | 1997-09-08 | 1998-08-28 | Axial-to-rotary motor having great gear reduction |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1012492A1 true EP1012492A1 (en) | 2000-06-28 |
Family
ID=20408175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98943130A Withdrawn EP1012492A1 (en) | 1997-09-08 | 1998-08-28 | Axial-to-rotary motor having great gear reduction |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1012492A1 (en) |
JP (1) | JP2001516001A (en) |
AU (1) | AU9099098A (en) |
SE (1) | SE510009C2 (en) |
WO (1) | WO1999013244A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103277140B (en) * | 2013-05-27 | 2015-03-25 | 长治市远路矿用设备有限责任公司 | Pneumatic motor reducer |
US9999795B1 (en) | 2016-12-15 | 2018-06-19 | Katarzyna Lucja Jarosz | Motorized rotatable exercise pole |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1774356A (en) * | 1929-01-04 | 1930-08-26 | Preston E Cloud | Windshield wiper |
US2564608A (en) * | 1950-06-21 | 1951-08-14 | James S Robbins | Hydraulic tractor drive |
US2911835A (en) * | 1956-07-05 | 1959-11-10 | Deering Milliken Res Corp | Traversing arrangement |
SE433393B (en) * | 1979-10-17 | 1984-05-21 | Elajo Invest | Movement transforming mechanism |
-
1997
- 1997-09-08 SE SE9703231A patent/SE510009C2/en not_active IP Right Cessation
-
1998
- 1998-08-28 AU AU90990/98A patent/AU9099098A/en not_active Abandoned
- 1998-08-28 EP EP98943130A patent/EP1012492A1/en not_active Withdrawn
- 1998-08-28 WO PCT/SE1998/001536 patent/WO1999013244A1/en not_active Application Discontinuation
- 1998-08-28 JP JP2000510998A patent/JP2001516001A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9913244A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE9703231L (en) | 1999-03-09 |
SE510009C2 (en) | 1999-04-12 |
AU9099098A (en) | 1999-03-29 |
JP2001516001A (en) | 2001-09-25 |
WO1999013244A1 (en) | 1999-03-18 |
SE9703231D0 (en) | 1997-09-08 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20000306 |
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AK | Designated contracting states |
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GRAG | Despatch of communication of intention to grant |
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RTI1 | Title (correction) |
Free format text: AXIAL-TO-ROTARY MOVEMENT MOTOR HAVING GREAT GEAR REDUCTION |
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RTI1 | Title (correction) |
Free format text: AXIAL-TO-ROTARY MOVEMENT MOTOR HAVING GREAT GEAR REDUCTION |
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18D | Application deemed to be withdrawn |
Effective date: 20021204 |