EP0243351A1 - Device for transforming rotary motion into oscillatory motion - Google Patents

Device for transforming rotary motion into oscillatory motion

Info

Publication number
EP0243351A1
EP0243351A1 EP85905339A EP85905339A EP0243351A1 EP 0243351 A1 EP0243351 A1 EP 0243351A1 EP 85905339 A EP85905339 A EP 85905339A EP 85905339 A EP85905339 A EP 85905339A EP 0243351 A1 EP0243351 A1 EP 0243351A1
Authority
EP
European Patent Office
Prior art keywords
gears
gear
shafts
pair
shaft
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Withdrawn
Application number
EP85905339A
Other languages
German (de)
French (fr)
Inventor
Soon Ki Kim
Soon Yoon Han
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0243351A1 publication Critical patent/EP0243351A1/en
Withdrawn legal-status Critical Current

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
    • F16H19/08—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary motion and oscillating motion
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • 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
    • F16H27/00—Step-by-step mechanisms without freewheel members, e.g. Geneva drives
    • F16H27/04—Step-by-step mechanisms without freewheel members, e.g. Geneva drives for converting continuous rotation into a step-by-step rotary movement
    • F16H27/08—Step-by-step mechanisms without freewheel members, e.g. Geneva drives for converting continuous rotation into a step-by-step rotary movement with driving toothed gears with interrupted toothing

Definitions

  • the present invention relates to devices for transforming rotary motion into oscillatory motion using three parallel shafts and five spur gears, wherein a pair of gears is fixed to the two shafts each and meshed with each other operating as "link gears" and another a pair of gears is also fixed to the said two shafts, respectively, and the remaining one is fixed to the third shaft meshing with the second pair of gears. Except link gears one or two gears, at least, must be partially toothed gears having teeth in sector. The shaft having this partially toothed gear rotates drivingly in a certain direction meshing with other gear and transmits the gear action intermittently. Through link gears these intermittent actions are combined in an oscillatory motion.
  • crank and connecting link mechanism The most wide using mechanism to transform rotary motion into oscillatory motion at present is the crank and connecting link mechanism.
  • this normal simple crank and link mechanism has several defects. By this mechanism, it is almost impossible to get more than 90 degrees of oscillation, even not allowing to set the shaft supporting devices on both sides and giving unequal half cycle time. But it can not be neglected that the latter fuction is contributing to us as "quick return mechanism" in many kinds of machineries.
  • the objection of this invention is to settle the above mentioned defects and to provide a wider angular movement such as 180° including an intermittent oscillatory motion and also, in case of requiring, two opposite oscillating movement at same time.
  • Fig. 1 and 2 are a schematic front view and a side view showing a shaft having a partially toothed gear rotates, the other two shafts having a large gear and a smaller gear on each oscillate in opposite directions.
  • Fig. 3 and 4 are the same view as Fig. 1 and 2 except the cross sections of the three shafts are not lined in a row.
  • Fig. 5 and 6 are a schematic front view and a side view showing two shafts having a partially toothed gear and an ordinary gear on each rotate in opposite directions, the third shaft having a gear oscillates.
  • Fig. 7 is showing a set of plate cam.
  • Fig. 8 is a schematic fragmental view showing the action starting point.
  • Fig. 9 is showing a different action starting point to Fig. 8.
  • Fig. 10 is a schematic fragmental view showing one of the stub tooth on the driven gear.
  • Fig. 11 is showing one of the skewed stub tooth on the driven gear.
  • a 1 is a rotating input shaft and b 1 , b 2 are the oscillating shafts paralleled to a 1 .
  • A is a partially toothed gear having teeth in sector and is fixed to shaft a 1
  • a pair of gears B 1 and B 2 is fixed to shaft b 1 and D 2 , respectively, meshing with the gear A in turn when it rotates to R direction.
  • Another pair of big gears C 1 and C 2 meshing with each other is fixed to the shaft b 1 and b 2 , too.
  • Z A the total number of teeth (or the number of circular pitches) could be made on the gear A and Z B that of the gear B 1 or B 2 .
  • ⁇ is the number of remained teeth on gear A and ⁇ is the ⁇ egrees of the center angle both indicating the number of teeth (or the number of circular pitches) in the intercepting range between to the addendum circles of the gear A and B.
  • the oscillating angle ⁇ is also indicated by in the number of teeth or the number of circular pitches.
  • the two parallel shafts a 1 and a 2 having a pair of meshing gear C 1 and C 2 , as link gear, on each shaft and rotate in the opposite directions.
  • a pair of partially toothed gear A 1 and A 2 which size is equal or smaller to that of the link gears, is fixed.
  • the arrangement of gear A 2 is, after rotating A 1 gear to 180° around the shaft a 1 symmetrizing to the line vertical to a 1 - a 2 line and passing through to the center of the shaft b 1 .
  • the oscillating gear B is fixed to this shaft b 1 which is parallel to the rotating shafts a 1 and a 2 , meshing with the two gears A 1 and A 2 in turn.
  • the cross sections of the three shafts form a triangle. First the teeth on gear A 1 meshes with the teeth on gear B, turning it to Lo direction and then the teeth on A 2 meshes with the teeth on gear B, turning it to Ro direction.
  • ⁇ x is the maximum number of the remained tooth on the rotary input gears A 1 and A 2 , and can be obtained from the same equation, as said,
  • the action starting point would be either S 1 in Fig. 8 and S 2 in Fig. 9 or a point between these two points.
  • This invention is good to apply for the relatively low speed and light load because of the impact which arises at the action starting moment. It is also desired to reduce the stand still moment of inertia by using springs, cams and etc. To avoid the weakness of the first tooth on the gears, it is also suggested to rotate the input gear, which has the Geneva Stop cam, in the reverse direction.
  • this invention can easily be tried to apply to the wide range wiper brushes on automobiles, to the traditional wind fans oscillated by electric power, to the toys required various oscillatory motions and etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Gear Transmission (AREA)
  • Retarders (AREA)

Abstract

Dispositif permettant d'obtenir un mouvement oscillatoire à rendement élevé avec un grand angle d'oscillation, une vitesse relativement faible et une petite charge en utilisant trois arbres et cinq engrenages droits. Une paire d'engrenages ordinaires fixés sur deux arbres sont en prise l'un sur l'autre en tant qu'engrenages de liaison, tandis qu'une autre paire d'engrenages fixés sur les mêmes arbres, respectivement, sont en prise avec l'engrenage restant sur le troisième arbre des deux côtés. A l'exception des engrenages de liaison, au moins un ou deux engrenages doivent être partiellement dentés présentant des dentures divisées en secteurs. Lors de la rotation d'un arbre ne possédant qu'un engrenage partiellement denté, la paire d'arbres restants oscille. Lorsqu'une paire d'arbres possédant une paire d'engrenages partiellement dentés tournent dans des directions opposées, le troisième arbre ne possédant qu'un engrenage oscille. Pour garantir un mouvement fiable et sans à-coups, il est nécessaire d'utiliser un ensemble de cames faisant office d'un mécanisme d'arrêt par mouvement de Genève.A device for achieving high-efficiency oscillatory motion with large oscillation angle, relatively low speed and small load by using three shafts and five spur gears. A pair of ordinary gears attached to two shafts mesh with each other as link gears, while another pair of gears attached to the same shafts, respectively, mesh with each other. gear remaining on the third shaft on both sides. With the exception of the link gears, at least one or two gears must be partially toothed with teeth divided into sectors. When rotating a shaft that has only a partially toothed gear, the remaining pair of shafts oscillate. When a pair of shafts having a pair of partially toothed gears rotate in opposite directions, the third shaft having only one gear oscillates. To ensure reliable and smooth movement, it is necessary to use a set of cams that act as a Geneva stop mechanism.

Description

DEVICE FOR TRANSFORMING ROTARY MOTION INTO OSCILLATORY MOTION
TECHNICAL FIELD
The present invention relates to devices for transforming rotary motion into oscillatory motion using three parallel shafts and five spur gears, wherein a pair of gears is fixed to the two shafts each and meshed with each other operating as "link gears" and another a pair of gears is also fixed to the said two shafts, respectively, and the remaining one is fixed to the third shaft meshing with the second pair of gears. Except link gears one or two gears, at least, must be partially toothed gears having teeth in sector. The shaft having this partially toothed gear rotates drivingly in a certain direction meshing with other gear and transmits the gear action intermittently. Through link gears these intermittent actions are combined in an oscillatory motion.
BACKGROUND ART
The most wide using mechanism to transform rotary motion into oscillatory motion at present is the crank and connecting link mechanism. However, this normal simple crank and link mechanism has several defects. By this mechanism, it is almost impossible to get more than 90 degrees of oscillation, even not allowing to set the shaft supporting devices on both sides and giving unequal half cycle time. But it can not be neglected that the latter fuction is contributing to us as "quick return mechanism" in many kinds of machineries. DISCLOSURE OF INVENTION
The objection of this invention is to settle the above mentioned defects and to provide a wider angular movement such as 180° including an intermittent oscillatory motion and also, in case of requiring, two opposite oscillating movement at same time. When one of the three shafts, which has a partially toothed gear only? rotates, then the remaining a pair of shafts oscillates in opposite directions respectively. And when a pair of shafts having a pair of partially toothed gears rotates in opposite directions each other, then the gear on third shaft oscillates according to the meshing with the partially toothed gears in turn.
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 and 2 are a schematic front view and a side view showing a shaft having a partially toothed gear rotates, the other two shafts having a large gear and a smaller gear on each oscillate in opposite directions.
Fig. 3 and 4 are the same view as Fig. 1 and 2 except the cross sections of the three shafts are not lined in a row.
Fig. 5 and 6 are a schematic front view and a side view showing two shafts having a partially toothed gear and an ordinary gear on each rotate in opposite directions, the third shaft having a gear oscillates.
Fig. 7 is showing a set of plate cam.
Fig. 8 is a schematic fragmental view showing the action starting point.
Fig. 9 is showing a different action starting point to Fig. 8. Fig. 10 is a schematic fragmental view showing one of the stub tooth on the driven gear. Fig. 11 is showing one of the skewed stub tooth on the driven gear.
BEST MODE FOR CARRING OUT THE INVENTION
In Fig. 1 and 2 a1 is a rotating input shaft and b1 , b2 are the oscillating shafts paralleled to a1. A is a partially toothed gear having teeth in sector and is fixed to shaft a1, and a pair of gears B1 and B2 is fixed to shaft b1 and D2, respectively, meshing with the gear A in turn when it rotates to R direction. Another pair of big gears C1 and C2 meshing with each other is fixed to the shaft b1 and b2 , too. Now designate ZA the total number of teeth (or the number of circular pitches) could be made on the gear A and ZB that of the gear B1 or B2. α is the number of remained teeth on gear A and β is the αegrees of the center angle both indicating the number of teeth (or the number of circular pitches) in the intercepting range between to the addendum circles of the gear A and B.
In Fig. 2 d = 5 and gear A rotating to the R direction turns the gear B1 to the Lo direction. When the sector of teeth 1, 2, 3, 4, 5 comes to the place 1', 2', 3', 4', 5 , then the position of the all gear teeth of B1 and B2 becomes 1', 2", 3', 4', 5 ', , turning the shaft b1 to Lo and b2 to Ro direction with the angle Q and then the shafts b1 and b2 with their gears will stop for an instant. The next moment the teeth 1', 2', 3', 4', 5' of the gear A mesh with the teeth 1', 2', 3', 4', 5 ' of the gear B2 turning shafts b1 and b2 in the opposite directions each other with the angle θ . That is, the rotation of R direction of the shaft a1 turns the shafts b1 and b2 to the opposite directions with the angle θ.
Here designate αx the maximum number of α on gear A, then in the equation _____ _ β + 1 ≥ αx ≥ M - β + 1 » we can obtain αx which should be a whole number satisfacting in the above equation and d. is in the range αx ≥ d ≥ 1.
And in Fig.2. r = - ( α+ β - 1 ) hence θ is θ = d + β 1 (whereas r' = r - 0.5X and X is cardinal numbers such as 1, 2, 3, ..,etc. This means r' is always less than 0.5)
In the equation the oscillating angle θ is also indicated by in the number of teeth or the number of circular pitches.
As shown in Fig. 2, just after coming out the 5th tooth of the gear A from 5th and 6th tooth of the gear B2, 1st tooth of gear A starts to mesh with the 1st tooth of the gear B1 Here, if r is ½ > y > 0 , tiιen that the gear system has itself the locking cam ability to prevent free rotation of the shafts b1 and b2, but if r ≥ ½ , then the gear system has not the locking cam ability by itself. In this case a special device should be arranged to this system to prevent the free rotation of the shafts b1 and b2.
In Fig. 7 the plate cam having a locking arc Pa on plate Ca on "the driving shaft a1 and saddle curves Pb on plate Cb on the driven shafts b1 and b2 will ect as a kind of Geneva - Stop mechanism. To make this simple, attache a locking arc to the recess side of the tooth flank on αth tooth of the driving gear and a saddle curve to the space where a few tooth were pulled out from just after the αth tooth of the driven gear. Through these kinds of method, a smooth oscillatory movement can be achieved, whether T is less than X or not.
In a case, as shown in Fig. 3 and 4, the cross sections of the three shafts form a triangle, the angle <b1 a1 b2 indicate as. ω, and then αx is obtained from the following equation
ω ≥ αx + β - 1
but θ is still calculated by the equation,
θ = α + β + r' - 1
As shown in Fig. 4 while the teeth 1, 2, 3, 4 on the driving partially toothed gear come to the place 1', 2', 3', 4', rotating to L direction, b1 shaft rotates to Ro direction and while the A gear teeth comes to the place 1", 2", 3", 4", b2 shaft rotates to Ro direction, and then the both shafts will stop with a relatively long stopping time. In the above case, after the half cycle of the oscillatory motion, the stopping time is not equal to that of the one cycle. So this motion is one cycle intermittent motion."
Now, in the example shown by the Fig. 5 and 6, the two parallel shafts a1 and a2 having a pair of meshing gear C1 and C2 , as link gear, on each shaft and rotate in the opposite directions. On the said shafts a1 and a2 a pair of partially toothed gear A1 and A2, which size is equal or smaller to that of the link gears, is fixed. The arrangement of gear A2 is, after rotating A1 gear to 180° around the shaft a1 symmetrizing to the line vertical to a1 - a2 line and passing through to the center of the shaft b1. The oscillating gear B is fixed to this shaft b1 which is parallel to the rotating shafts a1 and a2, meshing with the two gears A1 and A2 in turn. In this example the cross sections of the three shafts form a triangle. First the teeth on gear A1 meshes with the teeth on gear B, turning it to Lo direction and then the teeth on A2 meshes with the teeth on gear B, turning it to Ro direction.
Here again αx is the maximum number of the remained tooth on the rotary input gears A1 and A2 , and can be obtained from the same equation, as said,
and the oscillating angle θ = α + β + r' - 1
All the examples in the above, the action starting point would be either S1 in Fig. 8 and S2 in Fig. 9 or a point between these two points.
If the action starting point comes on a point between S1 and S2, this is called to be stable, but if the action starting point comes on the point S1, it is unstable case, a special treat is required, doing the 2nd tooth of the oscillatory output gear to be a stub tooth as in Fig. 10 and 11. S2 point is also a very unstable point and should be avoided.
In any case, it can be adjusted by varying the size and form of the cams, acting as a kind of Geneva Stop mechanism and the clearance of the center distance of the shafts to get a smooth operation.
INDUSTRIAL APPLICABILITY
This invention is good to apply for the relatively low speed and light load because of the impact which arises at the action starting moment. It is also desired to reduce the stand still moment of inertia by using springs, cams and etc. To avoid the weakness of the first tooth on the gears, it is also suggested to rotate the input gear, which has the Geneva Stop cam, in the reverse direction.
By this invention, we can get a oscillatory motion in almost uniform angular velocity with high efficiency, and the oscillating angle θ can be obtained from β - to even more than 360°. And by adjusting the number and position of α on the gear, various oscillatory motions can be obtained from the relatively simple embodiment.
As first attempt, this invention can easily be tried to apply to the wide range wiper brushes on automobiles, to the traditional wind fans oscillated by electric power, to the toys required various oscillatory motions and etc.

Claims

CLAIM
1. A partially toothed gear device for transforming rotary motion into oscillatory motion, comprising five spur gears are fixed to the three parallel shafts, wherein a pair of ordinary gears is fixed to the two shafts, respectively, meshing with each other, and the remained three gears are fixed to the three, shafts, respectively, in such a way that whether a rotating input gear having teeth in sector, which is fixed to a shaft alone, meshes with the two gears in turn, or a oscillating output gear, which is fixed to a shaft alone, meshes with a pair of gears having teeth in sector, in turn, and by one or two of the rotating shafts having partially toothed gear the oscillating output motion is achieved in one or two shafts.
2. A device as claimed in claim 1 comprising the cams acting as Geneva Stop mechanism, wherein a locking arp cam is attached to the recess side of the tooth flank on the last tooth of the rotary driving gear, and a saddle curve cam is attached to the space where a few tooth were pulled out from just after the determined number of tooth of the driven gear, so as this saddle curve cam corresponds with the locking arc cam to get a smooth motion.
EP85905339A 1984-10-24 1985-10-24 Device for transforming rotary motion into oscillatory motion Withdrawn EP0243351A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR661384 1984-10-24
KR1019840006613A KR870000018B1 (en) 1984-10-24 1984-10-24 Method for converting a rotary motion into a oscillatory motion by way of intermittant motion gear

Publications (1)

Publication Number Publication Date
EP0243351A1 true EP0243351A1 (en) 1987-11-04

Family

ID=19235905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905339A Withdrawn EP0243351A1 (en) 1984-10-24 1985-10-24 Device for transforming rotary motion into oscillatory motion

Country Status (4)

Country Link
EP (1) EP0243351A1 (en)
KR (1) KR870000018B1 (en)
AU (1) AU5065085A (en)
WO (1) WO1986002706A1 (en)

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Publication number Priority date Publication date Assignee Title
JPH06154029A (en) * 1992-11-18 1994-06-03 Nippon Philips Kk Driving change mechanism for motor-driven toothbrush
CN1133830C (en) * 2000-06-23 2004-01-07 孙福山 Intermittent reciprocating rotation mechanism
CN101922538B (en) * 2010-09-02 2012-07-04 济南大学 Gear type automatic commutator
CN102106212B (en) * 2010-12-28 2012-07-25 浙江理工大学 Circle-ellipse pitch curve gear planetary system transmission case of transplanting mechanism
CN104141760B (en) * 2013-05-10 2016-12-28 上海灵钥机械设计有限公司 A kind of automatic changeover
CN104365243B (en) * 2014-10-28 2016-05-18 浙江理工大学 Circle-oval knot curved tooth cylindrical gear planetary system rotary box of transplanting mechanism
CN106553883B (en) * 2016-10-29 2019-05-28 安徽旭虹机械设备有限公司 A kind of overturning transport device
CN106542321A (en) * 2016-10-29 2017-03-29 安徽旭虹机械设备有限公司 A kind of Handling device for bar to be moved away from quenching bath
CN106629558B (en) * 2016-10-29 2018-12-11 安徽旭虹机械设备有限公司 A kind of paint kettle splendid attire line
CN106542310B (en) * 2016-10-29 2019-05-28 安徽旭虹机械设备有限公司 A kind of feeding device
CN109291073B (en) * 2018-11-02 2021-10-08 常州大学 Driving device for discrete rotation of double-freedom-degree joint of robot
CN109931387A (en) * 2019-03-05 2019-06-25 杭州天铭科技股份有限公司 A kind of transmission device
CN109931375A (en) * 2019-03-05 2019-06-25 杭州天铭科技股份有限公司 Transmission device
CN110345356B (en) * 2019-07-26 2020-11-06 义乌市凡特塑料制品有限公司 Rotary camera in non-continuous path

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DE2848352A1 (en) * 1978-01-09 1979-07-12 Dieter Zoell Driving wheel of stepped switch gear - has pins fitting into driven grooves with cylindrical parts arranged around driving and driven wheels
FR2486611A1 (en) * 1980-07-09 1982-01-15 Champagne Jean Rotary to reciprocation motion converter - has driving gears with teeth on only part of their circumference engaging driven output gear

Non-Patent Citations (1)

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Title
See references of WO8602706A1 *

Also Published As

Publication number Publication date
WO1986002706A1 (en) 1986-05-09
KR870000018B1 (en) 1987-01-28
AU5065085A (en) 1986-05-15
KR860003454A (en) 1986-05-26

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