WO1999047835A1 - A crank assembly intended for an internal combustion engine - Google Patents

A crank assembly intended for an internal combustion engine Download PDF

Info

Publication number
WO1999047835A1
WO1999047835A1 PCT/AU1999/000170 AU9900170W WO9947835A1 WO 1999047835 A1 WO1999047835 A1 WO 1999047835A1 AU 9900170 W AU9900170 W AU 9900170W WO 9947835 A1 WO9947835 A1 WO 9947835A1
Authority
WO
WIPO (PCT)
Prior art keywords
longitudinal axis
shaft
link shaft
internal gear
rotation
Prior art date
Application number
PCT/AU1999/000170
Other languages
French (fr)
Inventor
Peter Bortolin
Original Assignee
Peter Bortolin
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 Peter Bortolin filed Critical Peter Bortolin
Priority to AU29140/99A priority Critical patent/AU2914099A/en
Publication of WO1999047835A1 publication Critical patent/WO1999047835A1/en

Links

Classifications

    • 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
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • 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
    • F16H21/16—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and reciprocating motion
    • F16H21/18—Crank gearings; Eccentric gearings
    • F16H21/22—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric
    • F16H21/30—Crank gearings; Eccentric gearings with one connecting-rod and one guided slide to each crank or eccentric with members having rolling contact
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
    • F16H25/14—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation perpendicular to the axis of rotation

Definitions

  • the present invention relates to crank mechanisms and more particularly, but not exclusively to crank mechanisms for internal combustion engines.
  • crank assembly having: a primary shaft having a longitudinal axis about which the primary shaft is driven; a link shaft having a longitudinal axis and being attached to the primary shaft to transmit power thereto; coupling means attaching the link shaft to the primary shaft so as to provide for rotation of the link shaft about the longitudinal axis of the link shaft, as well as rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft; cam means engaging the link shaft to govern rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft; an internal gear surrounding the longitudinal axis of the primary shaft; an external gear mounted on the link shaft and fixed thereto while being meshingly engaged with the internal gear so that rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft will cause rotation of the link shaft about the longitudinal axis of the link shaft, the external gear being maintained in meshing engagement with the internal gear by the cam means; and a connecting rod being attached to the link shaft to permit relative rotation therebetween,
  • Figure 1 is a schematic side elevation of a crank mechanism for an internal combustion engine
  • Figure 2 is a schematic end elevation of the crank mechanism of Figure 1;
  • FIGS. 3, 4 and 5 schematically depict modifications of the crank mechanism of
  • the crank mechanism 10 includes a support 12 which rotatably supports a primary shaft 13 for rotation about its longitudinal axis 14.
  • the primary shaft 13 is attached to a flywheel 15.
  • a link shaft 16 Drivingly connected to the shaft 13 is a link shaft 16, by means of a universal coupling mechanism 17.
  • the coupling mechamsm 17 provides for the transfer of rotary power from the shaft 16 to the shaft 13, while still permitting rotation of the longitudinal axis 18 of the shaft 16, about the longitudinal axis 14.
  • the extremity of the shaft 16 is provided with a cam follower in the form of a roller 19.
  • the roller 19 is rotatable about the axis 18 and engages a cam surface 20 of a cam member 21.
  • an external gear 22 Fixed to the shaft 16 is an external gear 22 which is meshingly engaged with an internal gear 23.
  • the cam surface 20 via the roller 19 maintains the external gear 22 in meshing engagement with the internal gear 23.
  • the connecting rod 11 is also attached to the shaft 16 by means of a pivot assembly 24 enabling rotation of the shaft relative to the rod 11.
  • the piston associated with the connecting rod 11 causes movement of the shaft 16 and therefore rotation about the longitudinal axis 14.
  • Meshing engagement of the gears 22 and 23 causes rotation of the shaft 16 about its longitudinal axis 18 and therefore rotation of the shaft 13 about its longitudinal axis 14.
  • the internal gear 23 is provided with two arcuate portions 25 joined by generally linear portions 26.
  • the cam surface 20 is of a similar configuration.
  • the external gear 22 is generally circular in configuration.
  • the internal gear is circular in configuration with a centre at the intersection of the axis 27 and 28.
  • the cam member 21 has its external cam surface 20 of a corresponding configuration, that is circular. 3
  • the stroke of the piston is equal to the displacement of the cam follower 19 from the position "E" to the position "F".
  • the stroke of the engine can remain the same but the tongue is increased at the shaft 16.
  • the rod 11 is attached to the shaft 16 by a roller bearing 37.
  • the connecting rod 11 may be directly pivotally attached to the gear 22. Such an attachment may typically include the universal joint.
  • the cam member 21 is elongated so that the external surface 20 has 2 generally parallel co-extensive linear portions 29 and 30, with arcuate end portions 31.
  • the internal gear 23 has corresponding configuration in that it includes linear portions 32 joined by an arcuate portion 33.
  • the external gear 22 is circular in configuration matching the end portions 33.
  • the rod 11 is attached to the gear 22 adjacent the periphery thereto. The stroke of the engine will not change, however the tongue delivered to the shaft 16 will increase.
  • the internal gear 23 is of a "D" configuration in that it includes a linear portion 34 and an arcuate portion 35.
  • the cam member 21 is of a complimentary configuration in that it also includes a linear portion 36 and an arcuate portion 37.
  • the gear 22 is circular.
  • the linear portions 34 and 36 would correspond to the power stroke of the piston.

Abstract

The crank assembly can include a connecting rod (11) to be attached to the piston of the engine. The rod (11) is attached to an external gear (22) which meshingly engages with an internal gear (23). The gear (22) via a cam follower (19) also engages a cam member (21). In a preferred form the cam member (21) and internal gear (23) have a linear portion corresponding to the power stroke of an associated piston.

Description

1
A CRANK ASSEMBLY INTENDED FOR AN INTERNAL COMBUSTION ENGINE
Technical Field
The present invention relates to crank mechanisms and more particularly, but not exclusively to crank mechanisms for internal combustion engines.
Background of the Invention
Internal combustion engines are limited in that the torque is limited to the configuration of the crank assembly.
Object of the Invention It is the object of the present invention to overcome or substantially ameliorate the above disadvantage.
Summary of the Invention
There is disclosed herein a crank assembly having: a primary shaft having a longitudinal axis about which the primary shaft is driven; a link shaft having a longitudinal axis and being attached to the primary shaft to transmit power thereto; coupling means attaching the link shaft to the primary shaft so as to provide for rotation of the link shaft about the longitudinal axis of the link shaft, as well as rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft; cam means engaging the link shaft to govern rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft; an internal gear surrounding the longitudinal axis of the primary shaft; an external gear mounted on the link shaft and fixed thereto while being meshingly engaged with the internal gear so that rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft will cause rotation of the link shaft about the longitudinal axis of the link shaft, the external gear being maintained in meshing engagement with the internal gear by the cam means; and a connecting rod being attached to the link shaft to permit relative rotation therebetween, which connecting rod is driven so as to cause rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft.
Brief Description of the Drawings
A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings wherein:
Figure 1 is a schematic side elevation of a crank mechanism for an internal combustion engine;
Figure 2 is a schematic end elevation of the crank mechanism of Figure 1; and 2
Figures 3, 4 and 5 schematically depict modifications of the crank mechanism of
Figures 1 and 2.
Detailed Description of the Preferred Embodiments In the accompanying drawings there is schematically depicted a crank mechamsm
10 having a connecting rod 11 extending to a piston of an internal combustion engine. Accordingly, the connecting rod 11 is driven.
The crank mechanism 10 includes a support 12 which rotatably supports a primary shaft 13 for rotation about its longitudinal axis 14. The primary shaft 13 is attached to a flywheel 15.
Drivingly connected to the shaft 13 is a link shaft 16, by means of a universal coupling mechanism 17. The coupling mechamsm 17 provides for the transfer of rotary power from the shaft 16 to the shaft 13, while still permitting rotation of the longitudinal axis 18 of the shaft 16, about the longitudinal axis 14. The extremity of the shaft 16 is provided with a cam follower in the form of a roller 19. The roller 19 is rotatable about the axis 18 and engages a cam surface 20 of a cam member 21.
Fixed to the shaft 16 is an external gear 22 which is meshingly engaged with an internal gear 23. The cam surface 20 via the roller 19 maintains the external gear 22 in meshing engagement with the internal gear 23.
Also attached to the shaft 16 is the connecting rod 11 by means of a pivot assembly 24 enabling rotation of the shaft relative to the rod 11. The piston associated with the connecting rod 11 causes movement of the shaft 16 and therefore rotation about the longitudinal axis 14. Meshing engagement of the gears 22 and 23 causes rotation of the shaft 16 about its longitudinal axis 18 and therefore rotation of the shaft 13 about its longitudinal axis 14.
The internal gear 23 is provided with two arcuate portions 25 joined by generally linear portions 26. In that respect it should be appreciated that the cam surface 20 is of a similar configuration. The external gear 22 is generally circular in configuration. The above described preferred embodiment has the advantage that an internal combustion engine incorporating the crank mechanism 10, has increased torque. If so required, the crank mechanism 10 may be re-configured so as to provide an associated piston with a conventional stroke length, while still increasing the torque.
In the embodiments of figures 3 to 5, the reference numerals employed in the previous drawings have been continued.
In the embodiment of figure 3, the internal gear is circular in configuration with a centre at the intersection of the axis 27 and 28. The cam member 21 has its external cam surface 20 of a corresponding configuration, that is circular. 3
In this embodiment the stroke of the piston is equal to the displacement of the cam follower 19 from the position "E" to the position "F". Thus the stroke of the engine can remain the same but the tongue is increased at the shaft 16. In this embodiment the rod 11 is attached to the shaft 16 by a roller bearing 37. In the embodiment of figure 3 the connecting rod 11 may be directly pivotally attached to the gear 22. Such an attachment may typically include the universal joint.
In the embodiment of figure 4, the cam member 21 is elongated so that the external surface 20 has 2 generally parallel co-extensive linear portions 29 and 30, with arcuate end portions 31. The internal gear 23 has corresponding configuration in that it includes linear portions 32 joined by an arcuate portion 33. The external gear 22 is circular in configuration matching the end portions 33. The rod 11 is attached to the gear 22 adjacent the periphery thereto. The stroke of the engine will not change, however the tongue delivered to the shaft 16 will increase.
In the embodiment of figure 5, the internal gear 23 is of a "D" configuration in that it includes a linear portion 34 and an arcuate portion 35. The cam member 21 is of a complimentary configuration in that it also includes a linear portion 36 and an arcuate portion 37.
The gear 22 is circular.
The linear portions 34 and 36 would correspond to the power stroke of the piston.

Claims

4CLAIMS:
1. A crank assembly having: a primary shaft having a longitudinal axis about which the primary shaft is driven; a link shaft having a longitudinal axis and being attached to the primary shaft to transmit power thereto; coupling means attaching the link shaft to the primary shaft so as to provide for rotation of the link shaft about the longitudinal axis of the link shaft, as well as rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft; cam means engaging the link shaft to govern rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft; an internal gear surrounding the longitudinal axis of the primary shaft; an external gear mounted on the link shaft and fixed thereto while being meshingly engaged with the internal gear so that rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft will cause rotation of the link shaft about the longitudinal axis of the link shaft, the external gear being maintained in meshing engagement with the internal gear by the cam means; and a connecting rod being attached to the link shaft to permit relative rotation therebetween, which connecting rod is driven so as to cause rotation of the longitudinal axis of the link shaft about the longitudinal axis of the primary shaft.
2. The crank assembly of claim 1, wherein the cam means includes a cam surface with a linear portion to correspond with a power stroke of an associated piston, the internal gear having a corresponding linear portion.
3. The assembly of claim 2, wherein the cam member has a further linear portion, with the linear portions being generally parallel and co-existence, the internal gear having a further linear portion, the linear portions of the internal gear being generally parallel and co-extensive.
4. The assembly of claim 2, wherein said cam member has an arcuate portion extending from the linear portion, with said internal gear having a corresponding arcuate portion.
5. The assembly of claim 2, wherein said cam member is circular in configuration and said internal gear is also of a circular configuration.
6. The assembly of any one of claims 1 to 5, wherein said external gear is circular in configuration.
7. A crank assembly substantially as hereinbefore described with reference to figures 1 and 2, or any one of figures 3 to 5.
PCT/AU1999/000170 1998-03-18 1999-03-17 A crank assembly intended for an internal combustion engine WO1999047835A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29140/99A AU2914099A (en) 1998-03-18 1999-03-17 A crank assembly intended for an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPP2408A AUPP240898A0 (en) 1998-03-18 1998-03-18 Efficiency
AUPP2408 1998-03-18

Publications (1)

Publication Number Publication Date
WO1999047835A1 true WO1999047835A1 (en) 1999-09-23

Family

ID=3806670

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1999/000170 WO1999047835A1 (en) 1998-03-18 1999-03-17 A crank assembly intended for an internal combustion engine

Country Status (2)

Country Link
AU (1) AUPP240898A0 (en)
WO (1) WO1999047835A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1332302A1 (en) * 2000-10-06 2003-08-06 Peter Bortolin Power transmission apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G.D. HISCOX, "Mechanical Movements Devices and Appliances", Published 1899, by N. WHENLEY & CO (NEW YORK), Item 900 MANGLE RACK, Item 900 MANGLE RACK, Item 891 CRANK SUBSTITUTE, Item 897 RECIPROCATING RECTILINEAR MOTION. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1332302A1 (en) * 2000-10-06 2003-08-06 Peter Bortolin Power transmission apparatus
EP1332302A4 (en) * 2000-10-06 2005-08-03 Peter Bortolin Power transmission apparatus

Also Published As

Publication number Publication date
AUPP240898A0 (en) 1998-04-09

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