GB2024980A - Mechanism for Converting Rotary Motion into Cyclically Variable Rotary Motion or Vice Versa - Google Patents

Mechanism for Converting Rotary Motion into Cyclically Variable Rotary Motion or Vice Versa Download PDF

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Publication number
GB2024980A
GB2024980A GB7829387A GB7829387A GB2024980A GB 2024980 A GB2024980 A GB 2024980A GB 7829387 A GB7829387 A GB 7829387A GB 7829387 A GB7829387 A GB 7829387A GB 2024980 A GB2024980 A GB 2024980A
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United Kingdom
Prior art keywords
crank
rotation
axes
axis
rotary motion
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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Withdrawn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
GB7829387A
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Steward G F
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Steward G F
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Publication date
Application filed by Steward G F filed Critical Steward G F
Priority to GB7829387A priority Critical patent/GB2024980A/en
Publication of GB2024980A publication Critical patent/GB2024980A/en
Withdrawn legal-status Critical Current

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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
    • F16H21/00—Gearings comprising primarily only links or levers, with or without slides
    • F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
    • F16H21/12—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for conveying rotary motion

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

Abstract

Apparatus is disclosed comprising one or two cranks 20, 22 mounted for rotation about a first axis 12 and connected by connecting rods 24, 26 to two cranks 14, 18 mounted for rotation about a second axis 16 parallel to but spaced from the first axis 12. Rotation of the first crank or cranks 20, 22 will cause the second cranks 14, 18 to rotate with relative angular speeds which vary cyclically, the variation depending on the pitch of the two axes 12, 16 and the throw of all of the cranks. The second cranks, 14, 18 can be connected for example to rotating or reciprocating parts of a mechanism whose motion is interdependent and where the cyclic variation is useful to cause the parts to move rapidly in one phase of the cycle and more slowly in another phase of the cycle. <IMAGE>

Description

SPECIFICATION Mechanism-for Converting Rotary Motion into Variable Reciprocating Motion or Fluctuating Rotary Motion or Vice Versa This invention relates to apparatus for converting substantially constant angular speed rotary motion into variable speed reciprocatory or rotary motion or vice versa.
There are various situations in technology where it is desirable that a member should rotate at an angular speed which is not constant but which varies cyclically. Equally there are other situations where it is desirable that a member should move in a reciprocating motion in which the speed in one direction is considerably faster than the speed in the opposite direction. The present invention is concerned with situations of this type.
According to the invention, there is provided apparatus including at least three crank elements arranged for rotation about at least two axes offset one from the other, each crank element arranged for rotation about one of the axes being arranged to be connected by a connecting element to a crank element arranged for rotation about another of the axes.
In one form of the invention at least two of the crank elements are arranged for rotation about one of the axes.
According to one aspect of the invention, the apparatus includes four crank elements, two being arranged for rotation about one of the axes and two being arranged for rotation about another of the axes.
According to a further aspect of the invention, means is provided for varying the distance by which the one axis is off set from the other.
An embodiment of the invention is discussed with reference to the accompanying drawings in which Figures 1 to 4 are schematic illustrations of a mechanism in successive positions of a rotational cycle.
In the drawings there is shown a mechanism including a rotor or disc 10 comprising two cranks 20 and 22 mounted for rotation about an axis 12 which is fixed in space, the rotor 10 being shown in each successive illustration displaced in an anti-clockwise sense through 90 degrees from the position shown in the previous illustration; a third crank 14 mounted behind the rotor 10 for rotation about a second axis 1 6 which is fixed in space and is off set from the first axis 12; and a fourth crank 18 which is mounted for rotation also about the second axis 1 6.
The first crank 20 is rotationally displaced 180 degrees or other angle from the second crank 22.
The third crank 14 is connected to the crank 20 by means of a first connecting rod 24. The fourth crank 18 is connected to the crank 22 by means of a second connecting rod 26.
If the rotor 10 is rotated by a suitable prime mover (not shown) at a constant angular speed, the first crank 20 will drive the third crank 14, causing it to rotate and the second crank 22 will drive the fourth crank 1 8 also causing it to rotate.
Now the important feature of the mechanism is that, while each crank will in one cycle of the mechanism rotate through 360 degrees, the angle A between the third and fourth cranks 14 and 18 will vary in the cycle. This is a consequence of the fact that the rotational speed of the crank 1 4 varies during a cycle with respect to that of the crank 1 8. This variation can itself be altered by changing the distance by which the one axis 1 2 is off set from the second axis 1 6 and also by changing the throw of any of the cranks.
One way of employing the mechanism is to connect the crank 1 6 to a first reciprocating part of a machine and the crank 18 to a second reciprocating part of a machine. These connections can be brought about by any known means such as screws, spirals, cams, connecting rods or the like, or a combination thereof.
Moreover, the two cranks 16 and 18 can be connected together by means, for example, of a differential arrangement which is itself connected to a rotating or reciprocating part of a machine. In the latter case, the part could thus be arranged to move, for example, slowly in one direction, and rapidly in the opposite direction.
The crank 18 is mounted on a hollow shaft which is itself carried on suitable bearings. The crank 1 6 is mounted on an inner shaft which is received in the bore of the hollow shaft. The free ends of the shafts can thus be connected up as described above.
It will be clear that the apparatus can be used in the reverse sense, i.e. to change variable angular speed rotary motion into constant speed rotary motion.
The eccentricity can be changed over through concentricity to the opposite hand or sense, producing similar motions of the opposite attitude.
The invention has many applications. For example it can be applied to driving a positive displacement rotary pump, compressor or metering pump or reciprocating double piston machines.
The cranks 20 and 22 need not be fixed one with respect to the other but could be arranged to be separately driven in any suitable manner.
Claims
1. Apparatus including at least three crank elements arranged for rotation about at least two axes off set one from the other, each crank element arranged for rotation about one of the axes being arranged to be connected by a connecting element to a crank element arranged for rotation about another of the axes.
2. Apparatus according to claim 1, in which at least two of the crank elements are arranged for rotation about one of the axes.
3. Apparatus according to claim 1 or claim 2, including four crank elements, two being arranged for rotation about one of the axes and two being arranged for rotation about another of the axes.
4. Apparatus according to any one of claims 1
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Mechanism-for Converting Rotary Motion into Variable Reciprocating Motion or Fluctuating Rotary Motion or Vice Versa This invention relates to apparatus for converting substantially constant angular speed rotary motion into variable speed reciprocatory or rotary motion or vice versa. There are various situations in technology where it is desirable that a member should rotate at an angular speed which is not constant but which varies cyclically. Equally there are other situations where it is desirable that a member should move in a reciprocating motion in which the speed in one direction is considerably faster than the speed in the opposite direction. The present invention is concerned with situations of this type. According to the invention, there is provided apparatus including at least three crank elements arranged for rotation about at least two axes offset one from the other, each crank element arranged for rotation about one of the axes being arranged to be connected by a connecting element to a crank element arranged for rotation about another of the axes. In one form of the invention at least two of the crank elements are arranged for rotation about one of the axes. According to one aspect of the invention, the apparatus includes four crank elements, two being arranged for rotation about one of the axes and two being arranged for rotation about another of the axes. According to a further aspect of the invention, means is provided for varying the distance by which the one axis is off set from the other. An embodiment of the invention is discussed with reference to the accompanying drawings in which Figures 1 to 4 are schematic illustrations of a mechanism in successive positions of a rotational cycle. In the drawings there is shown a mechanism including a rotor or disc 10 comprising two cranks 20 and 22 mounted for rotation about an axis 12 which is fixed in space, the rotor 10 being shown in each successive illustration displaced in an anti-clockwise sense through 90 degrees from the position shown in the previous illustration; a third crank 14 mounted behind the rotor 10 for rotation about a second axis 1 6 which is fixed in space and is off set from the first axis 12; and a fourth crank 18 which is mounted for rotation also about the second axis 1 6. The first crank 20 is rotationally displaced 180 degrees or other angle from the second crank 22. The third crank 14 is connected to the crank 20 by means of a first connecting rod 24. The fourth crank 18 is connected to the crank 22 by means of a second connecting rod 26. If the rotor 10 is rotated by a suitable prime mover (not shown) at a constant angular speed, the first crank 20 will drive the third crank 14, causing it to rotate and the second crank 22 will drive the fourth crank 1 8 also causing it to rotate. Now the important feature of the mechanism is that, while each crank will in one cycle of the mechanism rotate through 360 degrees, the angle A between the third and fourth cranks 14 and 18 will vary in the cycle. This is a consequence of the fact that the rotational speed of the crank 1 4 varies during a cycle with respect to that of the crank 1 8. This variation can itself be altered by changing the distance by which the one axis 1 2 is off set from the second axis 1 6 and also by changing the throw of any of the cranks. One way of employing the mechanism is to connect the crank 1 6 to a first reciprocating part of a machine and the crank 18 to a second reciprocating part of a machine. These connections can be brought about by any known means such as screws, spirals, cams, connecting rods or the like, or a combination thereof. Moreover, the two cranks 16 and 18 can be connected together by means, for example, of a differential arrangement which is itself connected to a rotating or reciprocating part of a machine. In the latter case, the part could thus be arranged to move, for example, slowly in one direction, and rapidly in the opposite direction. The crank 18 is mounted on a hollow shaft which is itself carried on suitable bearings. The crank 1 6 is mounted on an inner shaft which is received in the bore of the hollow shaft. The free ends of the shafts can thus be connected up as described above. It will be clear that the apparatus can be used in the reverse sense, i.e. to change variable angular speed rotary motion into constant speed rotary motion. The eccentricity can be changed over through concentricity to the opposite hand or sense, producing similar motions of the opposite attitude. The invention has many applications. For example it can be applied to driving a positive displacement rotary pump, compressor or metering pump or reciprocating double piston machines. The cranks 20 and 22 need not be fixed one with respect to the other but could be arranged to be separately driven in any suitable manner. Claims
1. Apparatus including at least three crank elements arranged for rotation about at least two axes off set one from the other, each crank element arranged for rotation about one of the axes being arranged to be connected by a connecting element to a crank element arranged for rotation about another of the axes.
2. Apparatus according to claim 1, in which at least two of the crank elements are arranged for rotation about one of the axes.
3. Apparatus according to claim 1 or claim 2, including four crank elements, two being arranged for rotation about one of the axes and two being arranged for rotation about another of the axes.
4. Apparatus according to any one of claims 1 to 3, in which means is provided for varying the distance by which the one axis is off set from the other in any direction.
5. Apparatus substantially as herein described.
6. Apparatus substantially as herein described with reference to the accompanying drawing.
GB7829387A 1978-07-11 1978-07-11 Mechanism for Converting Rotary Motion into Cyclically Variable Rotary Motion or Vice Versa Withdrawn GB2024980A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7829387A GB2024980A (en) 1978-07-11 1978-07-11 Mechanism for Converting Rotary Motion into Cyclically Variable Rotary Motion or Vice Versa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7829387A GB2024980A (en) 1978-07-11 1978-07-11 Mechanism for Converting Rotary Motion into Cyclically Variable Rotary Motion or Vice Versa

Publications (1)

Publication Number Publication Date
GB2024980A true GB2024980A (en) 1980-01-16

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194611B (en) * 1986-01-27 1990-01-24 American Sterilizer Co High angle link hinge
WO2004000628A1 (en) * 2002-06-20 2003-12-31 Bless Werner M Progressive translation mechanism
RU2252350C1 (en) * 2003-11-05 2005-05-20 Пожбелко Владимир Иванович Gearing leverage
EA007686B1 (en) * 2005-02-01 2006-12-29 Иссыккульский Государственный Университет Им К. Тыныстанова Hinged-lever mechanism of variable structure
EA007709B1 (en) * 2005-02-01 2006-12-29 Иссыккульский Государственный Университет Им К. Тыныстанова Hinged-lever mechanism of variable structure
RU2307269C1 (en) * 2006-01-12 2007-09-27 Евгений Павлович Тихонов Rotation transmitting device
EP3163121A3 (en) * 2015-10-27 2017-05-31 Shih-Ming Huang Multi-link rotation structure

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194611B (en) * 1986-01-27 1990-01-24 American Sterilizer Co High angle link hinge
WO2004000628A1 (en) * 2002-06-20 2003-12-31 Bless Werner M Progressive translation mechanism
US7258364B2 (en) * 2002-06-20 2007-08-21 Werner Bless Progressive translation mechanism
RU2252350C1 (en) * 2003-11-05 2005-05-20 Пожбелко Владимир Иванович Gearing leverage
EA007686B1 (en) * 2005-02-01 2006-12-29 Иссыккульский Государственный Университет Им К. Тыныстанова Hinged-lever mechanism of variable structure
EA007709B1 (en) * 2005-02-01 2006-12-29 Иссыккульский Государственный Университет Им К. Тыныстанова Hinged-lever mechanism of variable structure
RU2307269C1 (en) * 2006-01-12 2007-09-27 Евгений Павлович Тихонов Rotation transmitting device
EP3163121A3 (en) * 2015-10-27 2017-05-31 Shih-Ming Huang Multi-link rotation structure
CN106969106A (en) * 2015-10-27 2017-07-21 黄明仕 Multi-connecting-rod rotating structure
CN106969106B (en) * 2015-10-27 2019-02-15 黄明仕 Multi-connecting-rod rotating structure

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)