CA2080432A1 - Mechanism for converting rotary to reciprocating rotary motion - Google Patents
Mechanism for converting rotary to reciprocating rotary motionInfo
- Publication number
- CA2080432A1 CA2080432A1 CA002080432A CA2080432A CA2080432A1 CA 2080432 A1 CA2080432 A1 CA 2080432A1 CA 002080432 A CA002080432 A CA 002080432A CA 2080432 A CA2080432 A CA 2080432A CA 2080432 A1 CA2080432 A1 CA 2080432A1
- Authority
- CA
- Canada
- Prior art keywords
- planet
- driveshaft
- carrier
- housing
- gear
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F01C1/063—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents with coaxially-mounted members having continuously-changing circumferential spacing between them
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
- F02B53/02—Methods of operating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transmission Devices (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A mechanism for converting rotary to reciprocating rotary motion comprises a housing, driveshaft, crank linkage, planet, carrier, flywheel, and timing assembly. The driveshaft, journaled in the housing, carries a flywheel incorporating a ring gear. The carrier is journaled in the flywheel and carries a planet which engages the ring gear. As the flywheel revolves with the driveshaft the timing assembly turns the carrier which drives the planet around the ring gear causing a point on the planet gear pitch cylinder to execute a reciprocating motion with respect to the flywheel. A crank linkage connects the planet along the reciprocating axis to an assembly revolving with the driveshaft imparting a reciprocating rotating motion to it.
A mechanism for converting rotary to reciprocating rotary motion comprises a housing, driveshaft, crank linkage, planet, carrier, flywheel, and timing assembly. The driveshaft, journaled in the housing, carries a flywheel incorporating a ring gear. The carrier is journaled in the flywheel and carries a planet which engages the ring gear. As the flywheel revolves with the driveshaft the timing assembly turns the carrier which drives the planet around the ring gear causing a point on the planet gear pitch cylinder to execute a reciprocating motion with respect to the flywheel. A crank linkage connects the planet along the reciprocating axis to an assembly revolving with the driveshaft imparting a reciprocating rotating motion to it.
Description
2~ r, ~
MECHANISM FOR CONVERTING ROTARY TO RECIPROCATING ROTARY
MOTION
BACKGROVND OF THE INVENTION
1. Field of the Invention 5 The present invention relates to mechanisms for converting between rotary and reciprocating rotary motion.
2. Brief Description of the Prior Art Mechanisms converting the motion of vanes or pistons that reciprocate while rotating to rotary driveshaft motion and vice versa are numerous and well known in the art. A
10 typical use is in a vane engine where each of a pair of concentric vane rotors is connected by a mechanism to an output shaft. The motion of a vane rotor rotating at some constant angular frequency, while simultaneously reciprocating at twice that frequency is converted by the connected mechanism to constant rotation of the output shaft.
Mechanisms, able to generate a simple harmonic reciprocating motion component 15 (e.g. U.S. Pat. Nos. 1,330,629, 1,946,136), have few load paths and transmit power through line contacts and therefore limit capacity. Other designs, with the reciprocating component approximating simple harmonic motion (e.g. U.S. Patent No. 1,603,630), have high inertial forces which limit their speed.
OBJECTS AND SUMMARY OF THE
INVENTION
The p~incipal object of the present invention is to provide a simple, robust drive mechanism to transforrn between reGiprocating rotary and rotary motion.
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Another object of the present invention is to provide a commercially feasible drive mechanism for a pump or internal combustion engine of the reciprocating rotating type.
Other objects and advantages of the present invention will become apparent as the following description proceeds.
S In accordance with the foregoing objects, a drive mechanism of the present invention comprises a housing, driveshaft, crank linkage, planet, carrier, flywheel~ and timing assembly. Details of lubrication, bearings, fasteners and the like are not discussed as they fall within the scope of competent engineering work.
The driveshaft, journaled in the housing, carries a flywheel incorporating a ring gear.
10 The carrier is journaled in the flywheel and carries a planet which engages the ring gear.
As the flywheel revolves with the driveshaft the timing assembly turns the carrier which drives the planet around the ring gear causing a point on the planet gear pitch cylinder to execute a reciprocating motion with respect to the flywheel. A crank linkage connects the planet along the reciprocating axis to an assembly revolving with the driveshaft 15 imparting a reciprocating rotating motion to it.
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows assembled and exploded views of one embodiment of a drive mechanism incorporating the present invention.
FIG. 2 shows assembled and exploded views of a second embodiment of the present 20 invention adapted to an internal combustion engine design.
FIG. 3 shows assembled and exploded views of a third embodiment of a drive mechanism incorporating the present invention using a cam type timing assembly.
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DESCRIPTION OF THE PREFERRED
EMBODIMENT
Figure 1 shows a drive mechanism embodying the present invention. The embodiment shown provides a single load path and incorporates a geared timing 5 arrangement.
The driveshaft 1) is journaled in bore H-l in the housing H. A flywheel F is affixed to the driveshaft. The flywheel has a bore F-1 parallel to the driveshaft incorporating a ring gear F-2. The carrier C is journaled in the flywheel bore F-1. The carrier has a bore C-l to accommodate the planet P. The planet shaft P-1 is journaled in the carrier 10 bore C-l with the planet gear P-2 engaging the ring gear F-2. The pitch diameter of the ring gear is twice that of the planet gear. The carrier incorporates a timing gear C-2 which engages a sun gear H-2, stationary on the housing. The pitch diameter of the sun gear is twice that of ~he timing gear. As the flywheel revolves with the driveshaft it drives the timing gear against the sun gear causing the carrier to revolve. The carrier 15 drives the planet around the ring gear causing a point on the planet gear pitch cylinder to execute a reciprocating motion relative to the flywheel. The timing and sun gears are timed so that this reciprocating motion is normal to the line joining the driveshaft and carrier axes. A crankpin P-3, on the planet, has its axis parallel to that of the planet and passing through a point on the planet gear pitch cylinder. A slider S is rotatably mounted 20 on the crankpin and rests in a slot M-l, part of a driven mechanism M coaxial with and pivoted about the driveshaft. The slider imparts a reciprocating rotating motion to the driven mechanism when the driveshaft is turned. Typically, the driven mechanism may be a vane rotor in a vane engine or pump.
-, - - . - - : ~ , -: :
- : :
Figure 2 shows a pair of drive mechanisms, each with three load paths, in an arrangement of a vane rotor engine.
Drive mechanisms, combined to share the same flywheel and timing mechanism, may be independently timed for individual output phasing, allowing more than one 5 mechanism to be driven.
The use of circular gears results in the reciprocating component of the motion of the driven mechanism being approximately sinusoidal. Pure sinusoidal and other motion profiles are feasible using non-circular gears.
The path of the crankpin P-3 need not be normal to the line joining the driveshaft and 10 carrier axes. For example, if the path is oriented along the line, the pinion may be directly connected to drive a piston in a rotating piston engine.
The crank linkage may incorporate one or more pivoting links rather than a slider.
An alte~native timing assembly may be comprised of a cam and roller arrangement as illustrated in FIG. 3 wherein a roller R on a pin PN, affixed to the planet gear pitch 15 cylinder parallel to the crankpin, is guided by a cam CM, affixed to the housing. causing the pin to reciprocate as the drive shaft rotates. In the embodiment shown, two rollers are used with an external cam, with the relative timing of the rollers maintained by the crankarm CA. The crankarm also serves as a connecting link (at CA-l) to the driven mechanism.
20 It will be understood from the examples cited, that the construction and arrangement of the various parts of the invention can be varied without departing from the scope of the invention or from the general mode of operation.
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While a certain illustrative embodiment of the present invention has been shown in the drawings and described in considerable detail, there is no intention to limit the invention to the specific forms disclosed. The intention is to cover all modifications, alternative constructions, equivalents and uses falling within the spirit and scope of the 5 invention as expressed in the appended claims.
,. . .
; ~- , . .: : , .- . .
MECHANISM FOR CONVERTING ROTARY TO RECIPROCATING ROTARY
MOTION
BACKGROVND OF THE INVENTION
1. Field of the Invention 5 The present invention relates to mechanisms for converting between rotary and reciprocating rotary motion.
2. Brief Description of the Prior Art Mechanisms converting the motion of vanes or pistons that reciprocate while rotating to rotary driveshaft motion and vice versa are numerous and well known in the art. A
10 typical use is in a vane engine where each of a pair of concentric vane rotors is connected by a mechanism to an output shaft. The motion of a vane rotor rotating at some constant angular frequency, while simultaneously reciprocating at twice that frequency is converted by the connected mechanism to constant rotation of the output shaft.
Mechanisms, able to generate a simple harmonic reciprocating motion component 15 (e.g. U.S. Pat. Nos. 1,330,629, 1,946,136), have few load paths and transmit power through line contacts and therefore limit capacity. Other designs, with the reciprocating component approximating simple harmonic motion (e.g. U.S. Patent No. 1,603,630), have high inertial forces which limit their speed.
OBJECTS AND SUMMARY OF THE
INVENTION
The p~incipal object of the present invention is to provide a simple, robust drive mechanism to transforrn between reGiprocating rotary and rotary motion.
.. . . . .
- . - ~.~ . : .. - .
.. . .. ' : ~ . ; .. ~ . .'.' ~ : : .
~.
- --2~
Another object of the present invention is to provide a commercially feasible drive mechanism for a pump or internal combustion engine of the reciprocating rotating type.
Other objects and advantages of the present invention will become apparent as the following description proceeds.
S In accordance with the foregoing objects, a drive mechanism of the present invention comprises a housing, driveshaft, crank linkage, planet, carrier, flywheel~ and timing assembly. Details of lubrication, bearings, fasteners and the like are not discussed as they fall within the scope of competent engineering work.
The driveshaft, journaled in the housing, carries a flywheel incorporating a ring gear.
10 The carrier is journaled in the flywheel and carries a planet which engages the ring gear.
As the flywheel revolves with the driveshaft the timing assembly turns the carrier which drives the planet around the ring gear causing a point on the planet gear pitch cylinder to execute a reciprocating motion with respect to the flywheel. A crank linkage connects the planet along the reciprocating axis to an assembly revolving with the driveshaft 15 imparting a reciprocating rotating motion to it.
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows assembled and exploded views of one embodiment of a drive mechanism incorporating the present invention.
FIG. 2 shows assembled and exploded views of a second embodiment of the present 20 invention adapted to an internal combustion engine design.
FIG. 3 shows assembled and exploded views of a third embodiment of a drive mechanism incorporating the present invention using a cam type timing assembly.
!. . ~ ,, . ~ . ' ' ` . ': . ' . ' ' . ''' . ~ '~ . ': . ` '` . '' :' - ` ':'` ` .: ' '. ' . .
: ' :, : ' I
.: ' .. ' ' : . ~ ~ , :' x~
DESCRIPTION OF THE PREFERRED
EMBODIMENT
Figure 1 shows a drive mechanism embodying the present invention. The embodiment shown provides a single load path and incorporates a geared timing 5 arrangement.
The driveshaft 1) is journaled in bore H-l in the housing H. A flywheel F is affixed to the driveshaft. The flywheel has a bore F-1 parallel to the driveshaft incorporating a ring gear F-2. The carrier C is journaled in the flywheel bore F-1. The carrier has a bore C-l to accommodate the planet P. The planet shaft P-1 is journaled in the carrier 10 bore C-l with the planet gear P-2 engaging the ring gear F-2. The pitch diameter of the ring gear is twice that of the planet gear. The carrier incorporates a timing gear C-2 which engages a sun gear H-2, stationary on the housing. The pitch diameter of the sun gear is twice that of ~he timing gear. As the flywheel revolves with the driveshaft it drives the timing gear against the sun gear causing the carrier to revolve. The carrier 15 drives the planet around the ring gear causing a point on the planet gear pitch cylinder to execute a reciprocating motion relative to the flywheel. The timing and sun gears are timed so that this reciprocating motion is normal to the line joining the driveshaft and carrier axes. A crankpin P-3, on the planet, has its axis parallel to that of the planet and passing through a point on the planet gear pitch cylinder. A slider S is rotatably mounted 20 on the crankpin and rests in a slot M-l, part of a driven mechanism M coaxial with and pivoted about the driveshaft. The slider imparts a reciprocating rotating motion to the driven mechanism when the driveshaft is turned. Typically, the driven mechanism may be a vane rotor in a vane engine or pump.
-, - - . - - : ~ , -: :
- : :
Figure 2 shows a pair of drive mechanisms, each with three load paths, in an arrangement of a vane rotor engine.
Drive mechanisms, combined to share the same flywheel and timing mechanism, may be independently timed for individual output phasing, allowing more than one 5 mechanism to be driven.
The use of circular gears results in the reciprocating component of the motion of the driven mechanism being approximately sinusoidal. Pure sinusoidal and other motion profiles are feasible using non-circular gears.
The path of the crankpin P-3 need not be normal to the line joining the driveshaft and 10 carrier axes. For example, if the path is oriented along the line, the pinion may be directly connected to drive a piston in a rotating piston engine.
The crank linkage may incorporate one or more pivoting links rather than a slider.
An alte~native timing assembly may be comprised of a cam and roller arrangement as illustrated in FIG. 3 wherein a roller R on a pin PN, affixed to the planet gear pitch 15 cylinder parallel to the crankpin, is guided by a cam CM, affixed to the housing. causing the pin to reciprocate as the drive shaft rotates. In the embodiment shown, two rollers are used with an external cam, with the relative timing of the rollers maintained by the crankarm CA. The crankarm also serves as a connecting link (at CA-l) to the driven mechanism.
20 It will be understood from the examples cited, that the construction and arrangement of the various parts of the invention can be varied without departing from the scope of the invention or from the general mode of operation.
. . , ,, .. ;
- , , ' , . ' ' . . . .
. .
., . , - . ~ ~ ~ , .- . . : ~ :
.
. ~ - . ~................ . .
. ~ ' . ., . ~.
.
... . . . .
. ~ .. . ...
- ~ ~
- . . ~ .. :,.. ... . .. ..
2" 'r`~' )_~
While a certain illustrative embodiment of the present invention has been shown in the drawings and described in considerable detail, there is no intention to limit the invention to the specific forms disclosed. The intention is to cover all modifications, alternative constructions, equivalents and uses falling within the spirit and scope of the 5 invention as expressed in the appended claims.
,. . .
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Claims (5)
1. A mechanism, capable of converting rotary motion to reciprocating rotary motion and comprising:
- a housing - a driveshaft mounted to rotate in said housing;
- a flywheel mounted on said driveshaft and angularly fixed to rotate in constant angular alignment with said driveshaft and having at least one axially extending bore, radially spaced from said driveshaft, incorporating a ring gear;
- a carrier journaled in said bore and having an axially extending bore radially spaced from the carrier centerline;
- a planet journaled in said bore in said carrier and having a gear to engage said ring gear;
- a timing mechanism controlling the orientation of the carrier relative to the housing;
- a linkage connecting the planet and a driven mechanism.
- a housing - a driveshaft mounted to rotate in said housing;
- a flywheel mounted on said driveshaft and angularly fixed to rotate in constant angular alignment with said driveshaft and having at least one axially extending bore, radially spaced from said driveshaft, incorporating a ring gear;
- a carrier journaled in said bore and having an axially extending bore radially spaced from the carrier centerline;
- a planet journaled in said bore in said carrier and having a gear to engage said ring gear;
- a timing mechanism controlling the orientation of the carrier relative to the housing;
- a linkage connecting the planet and a driven mechanism.
2. A drive mechanism as claimed in claim 1 in which said timing mechanism comprises a timing gear coaxial with and affixed to the carrier and adapted to engage a sun gear affixed to said housing and coaxial with said driveshaft.
3. A drive mechanism as claimed in claim 1 in which said linkage comprises a crankpin on the planet, with its axis parallel to that of the planet and passing through a point on the planet gear pitch cylinder.
4. A drive mechanism as claimed in claim 3 in which said crankpin engages a slider and said slider rests in a slot of said driven mechanism.
5. A drive mechanism as claimed in claim 1 in which said timing mechanism comprises:
- a pin affixed to and coaxial with a point on the pitch cylinder of at least one said planet;
- a roller on said pin;
- a cam affixed to said housing, engaging said roller and guiding it.
- a pin affixed to and coaxial with a point on the pitch cylinder of at least one said planet;
- a roller on said pin;
- a cam affixed to said housing, engaging said roller and guiding it.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002080432A CA2080432A1 (en) | 1992-10-13 | 1992-10-13 | Mechanism for converting rotary to reciprocating rotary motion |
| EP93921766A EP0616661A1 (en) | 1992-10-13 | 1993-10-13 | Mechanism for converting rotary to reciprocating rotary motion |
| PCT/CA1993/000411 WO1994009268A1 (en) | 1992-10-13 | 1993-10-13 | Mechanism for converting rotary to reciprocating rotary motion |
| AU51053/93A AU5105393A (en) | 1992-10-13 | 1993-10-13 | Mechanism for converting rotary to reciprocating rotary motion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002080432A CA2080432A1 (en) | 1992-10-13 | 1992-10-13 | Mechanism for converting rotary to reciprocating rotary motion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2080432A1 true CA2080432A1 (en) | 1994-04-14 |
Family
ID=4150536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002080432A Abandoned CA2080432A1 (en) | 1992-10-13 | 1992-10-13 | Mechanism for converting rotary to reciprocating rotary motion |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0616661A1 (en) |
| AU (1) | AU5105393A (en) |
| CA (1) | CA2080432A1 (en) |
| WO (1) | WO1994009268A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9175562B2 (en) * | 2011-03-29 | 2015-11-03 | Breville Pty Limited | Rotary engine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1332064A (en) * | 1963-12-16 | |||
| US3776202A (en) * | 1972-05-25 | 1973-12-04 | B Mesa | Rotary engine with sun gear drive |
| GB1556950A (en) * | 1977-09-28 | 1979-12-05 | Baer J S | Rotary fluidmachine |
-
1992
- 1992-10-13 CA CA002080432A patent/CA2080432A1/en not_active Abandoned
-
1993
- 1993-10-13 AU AU51053/93A patent/AU5105393A/en not_active Abandoned
- 1993-10-13 WO PCT/CA1993/000411 patent/WO1994009268A1/en not_active Application Discontinuation
- 1993-10-13 EP EP93921766A patent/EP0616661A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AU5105393A (en) | 1994-05-09 |
| EP0616661A1 (en) | 1994-09-28 |
| WO1994009268A1 (en) | 1994-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |