WO1989006742A1 - Variable lift valves - Google Patents
Variable lift valves Download PDFInfo
- Publication number
- WO1989006742A1 WO1989006742A1 PCT/GB1989/000059 GB8900059W WO8906742A1 WO 1989006742 A1 WO1989006742 A1 WO 1989006742A1 GB 8900059 W GB8900059 W GB 8900059W WO 8906742 A1 WO8906742 A1 WO 8906742A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lever
- levers
- valve
- coupling member
- camshaft
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
Definitions
- the present invention relates to an arrangement for varying the degree of valve lift in an internal combustion engine and in particular to an arrangement which permits such variation without at the same time altering the phase of opening of the valve.
- the volume of the intake charge of any cylinder varies with the operating conditions and if a fixed degree of valve lift is used under all operating conditions, as is the case in conventional engines, then the velocity of the charge through the skirt area and the resultant turbulence in the charge will vary over the engine operating range. It is clearly desirable, therefore, to be able to vary the valve lift so as to enable the air flow conditions to be optimised over the full operating range and in particular to permit higher air velocities under low speed part load conditions.
- Variable lift valves have been proposed (see for example GB 1201872, GB 1201558 and GB 682628) in which the position of a fulcrum of a rocker acting between a push rod and a valve can be varied to alter the mechanical advantage of the rocker and thereby alter the valve lift.
- Such arrangement have the disadvantage that they cannot be used in a overhead camshaft engine in which the camshaft is mounted in line with and above the valve stems.
- a mechanism for achieving variable lift of a valve of an internal combustion engine having a fixed profile overhead camshaft characterised by a lever arrangement interposed between the camshaft and the valve, which lever arrangement includes a first fixed fulcrum lever acted upon by the camshaft, a second fixed fulcrum lever arranged to actuate the valve and a coupling member movable relative to the fulcrums of the two levers for transmitting the movement of the first lever to the second lever.
- Each of the two levers may be constructed as a single arm lever but, depending upon the geometry of the cylinder head, one or both of the levers may alternatively be two armed levers. It is important in all cases that one arm of the first lever should overlie an arm of the second lever so that movement of one can be directly transmitted to the other.
- the travel of the second lever will vary with the position of the coupling member and in some cases, depending upon the lift height and the separation of the levers, the lower lever may overlap the position of the upper lever in a horizontal plane. Collision between the levers can be avoided by offsetting one of the levers to one side in the horizontal plane but this step alone would cause a bending moment to be applied to the coupling between the levers. It is therefore preferred in this case for the first lever to be bifurcated and to straddle the second lever. This bifurcation of the first lever is also effective to prevent direct collision between the first lever and the valve spring retainer plate.
- the coupling member between the levers may comprise a roller movable along the length of the overlapping lever arms.
- a roller may be supported on a sheet metal cage and movement of the roller can be effected by a rack and pinion mechanism in which the rack is constituted by or supported on the cage while the pinion can be formed on or driven by the shaft on which one of the levers is journalled.
- the coupling member may consist of a roller carried by a further lever pivotably mounted on the outer end of an arm projecting from the shaft on which one of the levers is journalled. As the latter shaft is turned, the further levers for all the cylinders are moved in unison to vary the positions of their respective rollers relative to the first and second levers of the valves.
- Figure l is a schematic representation of a prior art arrangement for achieving variable valve lift
- Figure 2 is a plan view of an embodiment of the present invention.
- FIG 3 shows a similar view to that of Figure 1 of the embodiment of the invention shown in Figure 2.
- a camshaft 10 acting on a valve 18 against the force of the valve spring 20 by way of a train comprising a cam follower 12 and a rocker lever 14 pivotable about a fulcrum 16.
- the position of the fulcrum 16 is adjustable to vary the mechanical advantage of the lever and thereby adjust the maximum lift of the valve 18 even though the cam 10 has a fixed profile.
- the mechanism of the fulcrum 16 comprises two blocks 24 and 26 joined to one another by a pivot pin 28.
- the block 26 can slide along a track 22 while the block 24 can slide along the length of the rocker lever 14, which is also formed with a suitable track for guiding the block 24.
- the fulcrum mechanism prevents movement of the rocker lever 14 out of the plane of the drawing.
- the embodiment of the present invention illustrated in Figures 2 and 3 overcomes this problem and comprises two interacting levers 50 and 52 interposed between the camshaft 10' and the valve 18'.
- the lever 50 is a fixed fulcrum lever pivotable about a shaft 54 and acted upon directly by the camshaft 10'.
- the lever 52 has two arms 52a and 52b which move in unison about a shaft 56.
- the lever arm 52a is disposed below the lever 50 and is moved by the latter through a coupling member 58 which is shown as being a pin.
- the resulting movement of the lever arm 52b causes the valve 18' to be opened against the action of the valve spring (not shown) .
- the mechanical advantage of the mechanism comprising the levers 50 and 52 depends upon the position of the coupling member 58.
- the coupling member 58 is mounted on a link arm 60 assembly formed of two plates straddling the coupling member 58 and pivotable about the axis of a pin 62 passing through an adjusting arm 64 projecting radially from the shaft 56 and mounted for rotation with the shaft 56.
- the adjusting arm 64 moves the position of the pin 62 which now moves the link arm 60 to reposition the coupling member 58 between the two levers 50 and 52a. The closer the coupling member 58 to the shaft 54, the less the lift of the valve 18'.
- the levers 50 and 52a will both rotate relative to the coupling member 58 during the opening of the valve and only line contact can be maintained.
- the coupling member has been shown as a pin rather than a flat block.
- line contact may cause severe wear and it is possible to substitute for the pin a two part block which incorporates a bearing surface, in a manner analogous to the block shown in Figure 1.
- valve springs 20 are relatively stiff and one or other of the springs of an engine is compressed at any angle of the camshaft 10. Thus if movement of all the coupling members 58 is effected simultaneously, then the force required must exceed the resistant of the valve springs. However, there are times when each coupling member associated with one of cylinder can be moved with minimal effort, namely when the valve is fully closed. To take advantage of this, one may stagger the movement of the individual coupling members so that each member 58 fulcrum is moved when it presents a minimum resistance. For example, the coupling-member 58 may be moved by way of a spring biased .lost motion mechanism arranged between the adjusting arm 64 and the shaft 56.
- the spring in the lost motion mechanism is sufficiently strong to move the coupling member 58 when the valve is closed but not otherwise. ' • If the coupling members 58 of all the cylinders are to be adjusted, then the shaft 56 is rotated to compress the springs of all the lost motion mechanisms. However, the individual link arms 60 will not move and displace their coupling members 58 until such time as the associated valve is closed and the coupling member 58 is not compressed between the two levers 50 and 52.
- the preferred embodiment of the invention can thus be seen to permit valve lift to be varied in an engine with an overhead camshaft arranged above the valves and to offer the additional advantage of enabling adjustment by a particularly simple and effective control system.
- the effort required for movement of the control system can be minimal this being important in order to avoid power losses.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A mechanism is described for achieving variable lift of a valve of an internal combustion engine having an overhead camshaft (10) disposed above the valves (18'). The mechanism comprises two levers (50, 52) both pivoted about fixed fulcrums and a coupling member (58) which is movable along overlapping arms of the two levers (50, 52) to vary the mechanical advantage and thereby vary the valve lift in dependence upon the position of the coupling member (58).
Description
VARIABLE LIFT VALVES
The present invention relates to an arrangement for varying the degree of valve lift in an internal combustion engine and in particular to an arrangement which permits such variation without at the same time altering the phase of opening of the valve.
The volume of the intake charge of any cylinder varies with the operating conditions and if a fixed degree of valve lift is used under all operating conditions, as is the case in conventional engines, then the velocity of the charge through the skirt area and the resultant turbulence in the charge will vary over the engine operating range. It is clearly desirable, therefore, to be able to vary the valve lift so as to enable the air flow conditions to be optimised over the full operating range and in particular to permit higher air velocities under low speed part load conditions.
The prior art discloses arrangements which permit the geometry of the intake port to be varied with the same aim in mind but these are less effective in the control of the air velocities since it is at the skirt area that the velocity is of importance and the closer the control mechanism is to this region, the more effective it will prove.
Variable lift valves have been proposed (see for example GB 1201872, GB 1201558 and GB 682628) in which the position of a fulcrum of a rocker acting between a push rod and a valve can be varied to alter the mechanical advantage of the rocker and thereby alter the valve lift. Such arrangement have the disadvantage that they cannot be used in a overhead camshaft engine in which the camshaft is mounted in line with and above the valve stems.
According to the present invention, there is provided a mechanism for achieving variable lift of a valve of an internal combustion engine having a fixed profile overhead camshaft, characterised by a lever arrangement interposed between the camshaft and the valve, which lever arrangement includes a first fixed fulcrum lever acted upon by the camshaft, a second fixed fulcrum lever arranged to actuate the valve and a coupling member movable relative to the fulcrums of the two levers for transmitting the movement of the first lever to the second lever.
Each of the two levers may be constructed as a single arm lever but, depending upon the geometry of the cylinder head, one or both of the levers may alternatively be two armed levers. It is important in all cases that one arm of the first lever should overlie an arm of the second lever so that movement of one can be directly transmitted to the other.
The travel of the second lever will vary with the position of the coupling member and in some cases, depending upon the lift height and the separation of the levers, the lower lever may overlap the position of the upper lever in a horizontal plane. Collision between the levers can be avoided by offsetting one of the levers to one side in the horizontal plane but this step alone would cause a bending moment to be applied to the coupling between the levers. It is therefore preferred in this case for the first lever to be bifurcated and to straddle the second lever. This bifurcation of the first lever is also effective to prevent direct collision between the first lever and the valve spring retainer plate.
The coupling member between the levers may comprise a roller movable along the length of the overlapping lever arms. Such a roller may be supported on a sheet metal
cage and movement of the roller can be effected by a rack and pinion mechanism in which the rack is constituted by or supported on the cage while the pinion can be formed on or driven by the shaft on which one of the levers is journalled.
As an alternative, the coupling member may consist of a roller carried by a further lever pivotably mounted on the outer end of an arm projecting from the shaft on which one of the levers is journalled. As the latter shaft is turned, the further levers for all the cylinders are moved in unison to vary the positions of their respective rollers relative to the first and second levers of the valves.
It is an important advantage of the invention that the point of contact of the second lever with the valve does not vary with the valve lift and consequently a conventional hydraulic tappet may be incorporated in the second levers so that free play between the cam and valve is taken up at all times. In this case, oil pressure to the hydraulic tappets may be transmitted along the support shaft and the second levers.
The invention will now be described further, by way of example, with reference to the accompanying drawings, in which:
Figure l is a schematic representation of a prior art arrangement for achieving variable valve lift,
Figure 2 is a plan view of an embodiment of the present invention, and
Figure 3 shows a similar view to that of Figure 1 of the embodiment of the invention shown in Figure 2.
In Figure 1, there is shown a camshaft 10 acting on a valve 18 against the force of the valve spring 20 by way of a train comprising a cam follower 12 and a rocker lever 14 pivotable about a fulcrum 16.
Whereas the fulcrum of the rocker lever of conventional engine is usually fixed, in the arrangement shown in Figure 1, the position of the fulcrum 16 is adjustable to vary the mechanical advantage of the lever and thereby adjust the maximum lift of the valve 18 even though the cam 10 has a fixed profile. To this end, the mechanism of the fulcrum 16 comprises two blocks 24 and 26 joined to one another by a pivot pin 28. The block 26 can slide along a track 22 while the block 24 can slide along the length of the rocker lever 14, which is also formed with a suitable track for guiding the block 24. Though movable in the plane of the drawing, because of the tracks, the fulcrum mechanism prevents movement of the rocker lever 14 out of the plane of the drawing.
While a mechanism as shown in Figure 1 can vary valve lift in an engine in which the cam 10 is mounted to one side of the valves 18, it cannot be used in overhead camshaft engines in which the camshaft is arranged above the stems of the valves.
The embodiment of the present invention illustrated in Figures 2 and 3 overcomes this problem and comprises two interacting levers 50 and 52 interposed between the camshaft 10' and the valve 18'. The lever 50 is a fixed fulcrum lever pivotable about a shaft 54 and acted upon directly by the camshaft 10'. The lever 52 has two arms 52a and 52b which move in unison about a shaft 56. The lever arm 52a is disposed below the lever 50 and is moved by the latter through a coupling member 58 which is shown as being a pin. The resulting movement of the lever arm 52b causes the valve 18' to be opened against the action of the valve spring (not shown) .
The mechanical advantage of the mechanism comprising the levers 50 and 52 depends upon the position of the coupling member 58. To permit this: position to be adjusted, the coupling member 58 is mounted on a link arm 60 assembly formed of two plates straddling the coupling member 58 and pivotable about the axis of a pin 62 passing through an adjusting arm 64 projecting radially from the shaft 56 and mounted for rotation with the shaft 56.
If the shaft 56 is rotated, the adjusting arm 64 moves the position of the pin 62 which now moves the link arm 60 to reposition the coupling member 58 between the two levers 50 and 52a. The closer the coupling member 58 to the shaft 54, the less the lift of the valve 18'.
In any one position of the coupling member 58, the levers 50 and 52a will both rotate relative to the coupling member 58 during the opening of the valve and only line contact can be maintained. For this reason, the coupling member has been shown as a pin rather than a flat block. However, such line contact may cause severe wear and it is possible to substitute for the pin a two part block which incorporates a bearing surface, in a manner analogous to the block shown in Figure 1.
The valve springs 20 are relatively stiff and one or other of the springs of an engine is compressed at any angle of the camshaft 10. Thus if movement of all the coupling members 58 is effected simultaneously, then the force required must exceed the resistant of the valve springs. However, there are times when each coupling member associated with one of cylinder can be moved with minimal effort, namely when the valve is fully closed. To take advantage of this, one may stagger the movement of the individual coupling members so that each member 58 fulcrum is moved when it presents a minimum resistance.
For example, the coupling-member 58 may be moved by way of a spring biased .lost motion mechanism arranged between the adjusting arm 64 and the shaft 56. The spring in the lost motion mechanism is sufficiently strong to move the coupling member 58 when the valve is closed but not otherwise. '• If the coupling members 58 of all the cylinders are to be adjusted, then the shaft 56 is rotated to compress the springs of all the lost motion mechanisms. However, the individual link arms 60 will not move and displace their coupling members 58 until such time as the associated valve is closed and the coupling member 58 is not compressed between the two levers 50 and 52.
If it is desired to incorporate a hydraulic tappet then this may be placed between the tip of the valve 18' and the lever arm 52b. Oil for the hydraulic tappet can be supplied along the pivot shaft 56 and the lever arms 52b.
The preferred embodiment of the invention can thus be seen to permit valve lift to be varied in an engine with an overhead camshaft arranged above the valves and to offer the additional advantage of enabling adjustment by a particularly simple and effective control system. The effort required for movement of the control system can be minimal this being important in order to avoid power losses.
Claims
1. A mechanism for achieving variable lift of a valve of an internal combustion engine having a fixed profile overhead camshaft, characterised by a lever arrangement interposed between the camshaft and the valve, which lever arrangement includes a first fixed fulcrum lever (50) acted upon by the camshaft (10'), a second fixed fulcrum lever (52) arranged to actuate the valve (18') and a coupling member (58) movable relative to the fulcrums of the two levers (50,52) for transmitting the movement of the first lever (50) to the second lever (52).
2. A mechanism as claimed in claim 1, wherein each of the two levers (50,52) is constructed as a single arm lever.
3. A mechanism as claimed in claim 1, wherein one or both of the levers (50,52) is a two armed lever.
4. A mechanism as claimed in any preceding claim, wherein the coupling member (58) between the levers (50,52) comprises a pin movable (58) along the length of the overlapping lever arms (50,52a).
5. A mechanism as claimed in claim 4, wherein the coupling member comprises a pin (58) carried by a further lever (60) pivotably mounted on the outer end of an arm (64) projecting from the shaft (56) on which one of the levers (52) is journalled.
6. A mechanism as claimed in any preceding claim, wherein a hydraulic tappet is arranged between the valve actuating lever (52b) and the end of the valve (18').
7. A mechanism as claimed in claim 6, wherein oil pressure to the hydraulic tappets is transmitted along a pivot shaft (56) about which the second levers (52) are mounted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1989605922 DE68905922T2 (en) | 1988-01-22 | 1989-01-20 | VARIABLE VALVE LIFT DEVICE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8801425 | 1988-01-22 | ||
| GB8801425A GB2214570A (en) | 1988-01-22 | 1988-01-22 | Variable lift i.c. engine valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1989006742A1 true WO1989006742A1 (en) | 1989-07-27 |
Family
ID=10630375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1989/000059 Ceased WO1989006742A1 (en) | 1988-01-22 | 1989-01-20 | Variable lift valves |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5031584A (en) |
| EP (1) | EP0397776B1 (en) |
| GB (1) | GB2214570A (en) |
| WO (1) | WO1989006742A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10036373A1 (en) * | 2000-07-18 | 2002-02-14 | Herbert Naumann | Hubventilsteuerungen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5596960A (en) * | 1995-10-02 | 1997-01-28 | Ford Motor Company | Internal combustion engine |
| GB9703605D0 (en) * | 1997-02-21 | 1997-04-09 | T & N Technology Ltd | Operating mechanisms for valves |
| GB2323630B (en) * | 1997-03-26 | 2000-09-06 | T & N Technology Ltd | Operating mechanisms for valves |
| US5970932A (en) * | 1997-12-02 | 1999-10-26 | Panzer | Rocker arm assembly |
| US6189497B1 (en) | 1999-04-13 | 2001-02-20 | Gary L. Griffiths | Variable valve lift and timing camshaft support mechanism for internal combustion engines |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235981A1 (en) * | 1986-02-28 | 1987-09-09 | General Motors Corporation | Variable valve lift/timing mechanism |
| WO1987007323A1 (en) * | 1986-05-21 | 1987-12-03 | Bennett Automotive Technology Pty. Ltd. | Engines for use with gaseous fuels |
| EP0294682A1 (en) * | 1987-06-11 | 1988-12-14 | The Jacobs Manufacturing Company | Rocker arm decoupler |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR992780A (en) * | 1948-08-24 | 1951-10-23 | Trigger timing mechanism in the exhaust valves of four-stroke engines | |
| GB682628A (en) * | 1949-07-20 | 1952-11-12 | Carl Friedrich Wilhelm Borgwar | Improvements in or relating to induction systems for internal combustion engines |
| US3422803A (en) * | 1967-06-07 | 1969-01-21 | Gen Motors Corp | Internal combustion engine construction and method for operation with lean air-fuel mixtures |
| US3413965A (en) * | 1967-07-13 | 1968-12-03 | Ford Motor Co | Mechanism for varying the operation of a reciprocating member |
| JPS55137305A (en) * | 1979-04-13 | 1980-10-27 | Nissan Motor Co Ltd | Valve lift for internal combustion engine |
| JPS6226562Y2 (en) * | 1981-03-10 | 1987-07-08 | ||
| FR2519375B1 (en) * | 1981-12-31 | 1986-07-11 | Baguena Michel | VARIABLE VALVE FOR FOUR-STROKE ENGINE |
| US4459946A (en) * | 1982-05-17 | 1984-07-17 | Investment Rarities, Incorporated | Valve actuating apparatus utilizing a multi-profiled cam unit for controlling internal combustion engines |
| JPS59168211A (en) * | 1983-03-11 | 1984-09-21 | Honda Motor Co Ltd | Valve gear with shutdown function for internal combustion engines |
| JPS59168212A (en) * | 1983-03-11 | 1984-09-21 | Honda Motor Co Ltd | Valve operation control device for internal combustion engines |
| JPS60228717A (en) * | 1984-04-27 | 1985-11-14 | Suzuki Motor Co Ltd | Variable device of valve lift in four-cycle engine |
| US4699094A (en) * | 1986-05-27 | 1987-10-13 | General Motors Corporation | Rocker arm and hydraulic lash adjuster with load/motion control button |
| SE464367B (en) * | 1987-02-26 | 1991-04-15 | Volvo Ab | VALVE MECHANISM CONTROLS A DISTRICT VALVE |
-
1988
- 1988-01-22 GB GB8801425A patent/GB2214570A/en not_active Withdrawn
-
1989
- 1989-01-20 EP EP89902393A patent/EP0397776B1/en not_active Expired - Lifetime
- 1989-01-20 WO PCT/GB1989/000059 patent/WO1989006742A1/en not_active Ceased
- 1989-01-20 US US07/548,897 patent/US5031584A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235981A1 (en) * | 1986-02-28 | 1987-09-09 | General Motors Corporation | Variable valve lift/timing mechanism |
| WO1987007323A1 (en) * | 1986-05-21 | 1987-12-03 | Bennett Automotive Technology Pty. Ltd. | Engines for use with gaseous fuels |
| EP0294682A1 (en) * | 1987-06-11 | 1988-12-14 | The Jacobs Manufacturing Company | Rocker arm decoupler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10036373A1 (en) * | 2000-07-18 | 2002-02-14 | Herbert Naumann | Hubventilsteuerungen |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2214570A (en) | 1989-09-06 |
| EP0397776A1 (en) | 1990-11-22 |
| GB8801425D0 (en) | 1988-02-24 |
| EP0397776B1 (en) | 1993-04-07 |
| US5031584A (en) | 1991-07-16 |
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