US20050045129A1 - Oil supply structure for continuously variable valve timing apparatus - Google Patents
Oil supply structure for continuously variable valve timing apparatus Download PDFInfo
- Publication number
- US20050045129A1 US20050045129A1 US10/749,232 US74923203A US2005045129A1 US 20050045129 A1 US20050045129 A1 US 20050045129A1 US 74923203 A US74923203 A US 74923203A US 2005045129 A1 US2005045129 A1 US 2005045129A1
- Authority
- US
- United States
- Prior art keywords
- oil supply
- oil
- supply pipe
- variable valve
- valve timing
- 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
Images
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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/022—Chain drive
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/024—Belt drive
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34436—Features or method for avoiding malfunction due to foreign matters in oil
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34436—Features or method for avoiding malfunction due to foreign matters in oil
- F01L2001/3444—Oil filters
-
- 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
- F01L2301/00—Using particular materials
Definitions
- the present invention relates to an oil supply structure for a continuously variable valve timing apparatus and, more particularly, to an oil supply structure for improving the response of a continuously variable valve timing apparatus.
- a rotor vane type continuously variable valve timing apparatus compares a rotating phase of a cam shaft with that of a cam shaft sprocket to rotate a cam shaft relative to a cam shaft sprocket to thereby advance or delay the rotating phase of the cam shaft.
- the cam shaft is rotated in the opposite rotating direction of the cam shaft sprocket relative to the cam shaft sprocket to delay the rotating phase
- the rotating phase is to be advanced, the cam shaft is rotated in the same rotating direction as that of the cam shaft sprocket relative to the cam shaft sprocket to advance the rotating phase.
- a power source that advances or delays the cam shaft relative to the cam shaft sprocket is oil pressure supplied from an oil pump.
- oil pressure supplied from an oil pump.
- the present invention provides an oil supply structure for a continuously variable valve timing apparatus adapted to automatically increase oil pressure supplied to the continuously variable valve timing apparatus when oil temperature rises, thereby enabling the continuously variable valve timing apparatus to provide a reliable response over an entire operating range of an engine.
- the oil supply structure for a continuously variable valve timing apparatus comprises a plurality of bimetal blocks that are disposed at an oil supply pipe between an oil pump and a continuously variable valve timing apparatus and are changed in shapes thereof by an increased oil pressure to thereby reduce a cross-sectional area of the oil supply pipe.
- FIG. 1 is a schematic constitutional drawing for illustrating an oil supply structure of a continuously variable valve timing apparatus according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view for illustrating an installed state of bimetal blocks in the oil supply pipe of FIG. 1 ;
- FIG. 3 is a schematic drawing for illustrating a reduced state of a cross-section of an oil supply pipe as compared with that of FIG. 2 ;
- FIG. 4 is a schematic view of the installed state of bimetal blocks in FIG. 3 as seen from a lateral surface.
- an oil supply structure for a continuously variable valve timing apparatus includes a rotor vane type actuator 7 mounted between a cam shaft sprocket 3 and a cam shaft 5 to enable a rotation of the cam shaft 5 relative to the cam shaft sprocket 3 .
- Sprocket 3 is connected to a crankshaft 1 by a belt or chain.
- An oil control valve 15 is also disposed for receiving oil pumped by an oil pump 11 from an oil pan 9 via an oil supply pipe 13 and supplying the oil to the variable valve timing actuator 7 by adjusting an oil passage.
- the oil control valve 15 is controlled by an electric signal provided from a controller 17 for receiving signals of various sensors and controlling advanced angles and delayed angles of the valve.
- the oil supply pipe 13 is equipped with a filter 19 for filtering oil supplied to the variable valve timing apparatus.
- the oil supply pipe 13 is mounted with a plurality of bimetal blocks 21 that are disposed between the oil pump 11 and the continuously variable valve timing apparatus.
- Bimetal blocks 21 change to shape in response to an increased oil temperature to thereby reduce the cross section of the oil supply pipe 13 .
- the bimetal blocks 21 are disposed at an inner side of the oil supply pipe 13 with a metal having a smaller thermal expansion coefficient mounted at an outer side of the oil supply pipe 13 and with a metal of larger thermal expansion coefficient such that when temperature rises, a free end, being changed in shape thereof, is moved into the inner side of the oil supply pipe 13 (See FIG. 4 ).
- bimetal blocks are arranged inside the oil supply pipe 13 , each in an equal interval therebetween along a circumferential direction.
- the free end of the bimetal blocks is made to change toward an inner side of the oil supply pipe 13 , where the free end is changed in shape thereof in a high temperature region out of temperature ranges of the oil flowing in the oil supply pipe 13 .
- the bimetal blocks 21 do not change in shape toward the inner side of the oil supply pipe 13 in a relatively low temperature region among temperature ranges in which the temperature of oil flowing in the oil supply pipe 13 can be changed.
- the bimetal blocks 21 change in shape in a temperature region where oil flowing in the oil supply pipe 13 is increased in temperature sufficient to reduce the viscosity, and as the bimetal blocks 21 approache an inner side of the oil supply pipe 13 , the cross section of the oil supply pipe 13 is decreased.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
An oil supply structure for a continuously variable valve timing apparatus wherein a plurality of bimetal blocks change in shape based on oil temperature in an oil supply pipe, whereby, when an oil temperature rises, oil pressure supplied to a variable valve timing apparatus is automatically increased to provide the variable valve timing apparatus with a reliable response over an entire operating range.
Description
- This application claims priority of Korean Application No. 10-2003-0061475, filed on Sep. 3, 2003, the disclosure of which is incorporated fully herein by reference.
- The present invention relates to an oil supply structure for a continuously variable valve timing apparatus and, more particularly, to an oil supply structure for improving the response of a continuously variable valve timing apparatus.
- A rotor vane type continuously variable valve timing apparatus compares a rotating phase of a cam shaft with that of a cam shaft sprocket to rotate a cam shaft relative to a cam shaft sprocket to thereby advance or delay the rotating phase of the cam shaft. In other words, when a rotating phase of a cam shaft is to be delayed in comparison with a cam shaft sprocket, the cam shaft is rotated in the opposite rotating direction of the cam shaft sprocket relative to the cam shaft sprocket to delay the rotating phase, and when the rotating phase is to be advanced, the cam shaft is rotated in the same rotating direction as that of the cam shaft sprocket relative to the cam shaft sprocket to advance the rotating phase.
- A power source that advances or delays the cam shaft relative to the cam shaft sprocket is oil pressure supplied from an oil pump. When engine revolution is low and oil temperature is high, there are cases where oil pressure becomes low enough to prevent the variable valve timing apparatus from being fully supplied with oil.
- When a cam shaft rotates in a direction opposite from that of the cam shaft sprocket, an operational friction of the cam shaft rather becomes conducive to the rotation of the cam shaft, so that a decreased oil pressure does not pose a big problem.
- However, there is a drawback in that the response of a continuously variable valve timing apparatus is decreased when oil temperature is increased to result in a decrease in viscosity and engine revolution is decreased to reduce the output pressure of an oil pump although a cam shaft should overcome an operational friction for rotation and a high oil pressure is needed during a control of an advanced angle.
- The present invention provides an oil supply structure for a continuously variable valve timing apparatus adapted to automatically increase oil pressure supplied to the continuously variable valve timing apparatus when oil temperature rises, thereby enabling the continuously variable valve timing apparatus to provide a reliable response over an entire operating range of an engine.
- In accordance with a preferred embodiment of the present invention, the oil supply structure for a continuously variable valve timing apparatus comprises a plurality of bimetal blocks that are disposed at an oil supply pipe between an oil pump and a continuously variable valve timing apparatus and are changed in shapes thereof by an increased oil pressure to thereby reduce a cross-sectional area of the oil supply pipe.
- For a better understanding of the nature and objects of the present invention, reference should be made to the following detailed description with the accompanying drawings, in which:
-
FIG. 1 is a schematic constitutional drawing for illustrating an oil supply structure of a continuously variable valve timing apparatus according to an embodiment of the present invention; -
FIG. 2 is a cross-sectional view for illustrating an installed state of bimetal blocks in the oil supply pipe ofFIG. 1 ; -
FIG. 3 is a schematic drawing for illustrating a reduced state of a cross-section of an oil supply pipe as compared with that ofFIG. 2 ; and -
FIG. 4 is a schematic view of the installed state of bimetal blocks inFIG. 3 as seen from a lateral surface. - A preferred embodiment of the present invention will now be described in detail with reference to the annexed drawings, where the present embodiment is not limiting the scope of the present invention but is given only as an illustrative purpose.
- Referring to
FIG. 1 , an oil supply structure for a continuously variable valve timing apparatus according to a preferred embodiment of the present invention includes a rotor vane type actuator 7 mounted between acam shaft sprocket 3 and acam shaft 5 to enable a rotation of thecam shaft 5 relative to thecam shaft sprocket 3.Sprocket 3 is connected to a crankshaft 1 by a belt or chain. Anoil control valve 15 is also disposed for receiving oil pumped by anoil pump 11 from anoil pan 9 via anoil supply pipe 13 and supplying the oil to the variable valve timing actuator 7 by adjusting an oil passage. - The
oil control valve 15 is controlled by an electric signal provided from acontroller 17 for receiving signals of various sensors and controlling advanced angles and delayed angles of the valve. Theoil supply pipe 13 is equipped with afilter 19 for filtering oil supplied to the variable valve timing apparatus. - Furthermore, as shown in the drawing with an enlarged cross-sectional view of the structure, the
oil supply pipe 13 is mounted with a plurality ofbimetal blocks 21 that are disposed between theoil pump 11 and the continuously variable valve timing apparatus. Bimetal blocks 21 change to shape in response to an increased oil temperature to thereby reduce the cross section of theoil supply pipe 13. - The bimetal blocks 21 are disposed at an inner side of the
oil supply pipe 13 with a metal having a smaller thermal expansion coefficient mounted at an outer side of theoil supply pipe 13 and with a metal of larger thermal expansion coefficient such that when temperature rises, a free end, being changed in shape thereof, is moved into the inner side of the oil supply pipe 13 (SeeFIG. 4 ). - Preferably, four bimetal blocks are arranged inside the
oil supply pipe 13, each in an equal interval therebetween along a circumferential direction. The free end of the bimetal blocks is made to change toward an inner side of theoil supply pipe 13, where the free end is changed in shape thereof in a high temperature region out of temperature ranges of the oil flowing in theoil supply pipe 13. - Next, the operation of the oil supply structure in the continuously variable valve timing apparatus thus constructed will be described.
- The
bimetal blocks 21 do not change in shape toward the inner side of theoil supply pipe 13 in a relatively low temperature region among temperature ranges in which the temperature of oil flowing in theoil supply pipe 13 can be changed. - As a result, oil flows in the
oil supply pipe 13 under conventional pressure, such that an appropriate level of oil pressure can be supplied to theoil control valve 15 and the continuously variable valve timing actuator 7 in a not-so-low oil viscosity state regardless of an engine running at a high speed or a low speed, thereby enabling the continuously variable valve timing apparatus in a stable manner. - The bimetal blocks 21 change in shape in a temperature region where oil flowing in the
oil supply pipe 13 is increased in temperature sufficient to reduce the viscosity, and as thebimetal blocks 21 approache an inner side of theoil supply pipe 13, the cross section of theoil supply pipe 13 is decreased. - Consequently, the oil flowing in the
oil supply pipe 13 with a reduced cross section rises in pressure, and the oil pressure thus increased can be stably supplied in an appropriate pressure level necessary for operation of the continuously variable valve timing apparatus regardless of whether the engine running at a high speed or a low speed range. - As apparent from the foregoing, there is an advantage in the oil supply structure for a continuously variable valve timing apparatus thus described according to the embodiment of the present invention in that a plurality of bimetal blocks change in shape due to oil temperature in an oil supply pipe, whereby, when an oil temperature rises, oil pressure supplied to the variable valve timing apparatus is automatically increased, thereby providing the variable valve timing apparatus with a reliable response over an entire operating range.
Claims (5)
1. An oil supply structure for a continuously variable valve timing apparatus comprising a plurality of bimetal blocks that are disposed at an oil supply pipe between an oil pump and said continuously variable valve timing apparatus, said blocks changing in shape due to increased oil pressure to thereby reduce the cross-sectional area of said oil supply pipe.
2. The structure as defined in claim 1 , wherein said bimetal blocks comprise a metal with a smaller thermal expansion coefficient disposed at an inner side of said oil supply pipe and a metal with larger thermal expansion coefficient disposed at an outer side of said oil supply pipe, such that a free end of said bimetal blocks moves toward an inner side of said oil supply pipe in response to higher temperatures among temperature ranges experienced by oil flowing in said oil supply pipe.
3. The structure as defined in claim 1 , wherein said bimetal blocks are arranged inside said oil supply pipe in equal intervals around a circumferential direction.
4. An oil supply structure for a continuously variable valve timing apparatus, comprising:
an oil pump;
an oil supply pipe communicating with said oil pump for supplying oil to said apparatus; and
temperature responsive restriction means disposed in said oil supply pipe between the oil pump and said apparatus for increasing oil supply pressure at oil temperatures about a critical range.
5. The oil supply structure of claim 4 , wherein said temperature responsive restriction means comprises bimetal block disposed around an inner circumference of said oil supply pipe, an end of said blocks bending inward in response to temperatures above the critical range.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020030061475A KR20050023912A (en) | 2003-09-03 | 2003-09-03 | oil supply structure for continuous variable valve timing apparatus |
KR10-2003-0061475 | 2003-09-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050045129A1 true US20050045129A1 (en) | 2005-03-03 |
Family
ID=34214802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/749,232 Abandoned US20050045129A1 (en) | 2003-09-03 | 2003-12-30 | Oil supply structure for continuously variable valve timing apparatus |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050045129A1 (en) |
JP (1) | JP3963168B2 (en) |
KR (1) | KR20050023912A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1780383A1 (en) * | 2005-10-31 | 2007-05-02 | Hitachi, Ltd. | Hydraulic control system for internal combustion engine |
US20080264200A1 (en) * | 2005-12-16 | 2008-10-30 | Schaeffler Kg | Feeder for a Camshaft Adjuster |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009293503A (en) * | 2008-06-05 | 2009-12-17 | Hitachi Automotive Systems Ltd | Valve timing control device for internal combustion engine |
JP6414100B2 (en) * | 2016-02-23 | 2018-10-31 | マツダ株式会社 | Engine oil supply device |
-
2003
- 2003-09-03 KR KR1020030061475A patent/KR20050023912A/en not_active Application Discontinuation
- 2003-12-22 JP JP2003425936A patent/JP3963168B2/en not_active Expired - Fee Related
- 2003-12-30 US US10/749,232 patent/US20050045129A1/en not_active Abandoned
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1780383A1 (en) * | 2005-10-31 | 2007-05-02 | Hitachi, Ltd. | Hydraulic control system for internal combustion engine |
US20070095316A1 (en) * | 2005-10-31 | 2007-05-03 | Hitachi, Ltd. | Hydraulic control system for internal combustion engine |
US7409937B2 (en) | 2005-10-31 | 2008-08-12 | Hitachi, Ltd. | Hydraulic control system for internal combustion engine |
US20080264200A1 (en) * | 2005-12-16 | 2008-10-30 | Schaeffler Kg | Feeder for a Camshaft Adjuster |
US8146549B2 (en) | 2005-12-16 | 2012-04-03 | Schaeffler Technologies Gmbh & Co. Kg | Feeder for a camshaft adjuster |
Also Published As
Publication number | Publication date |
---|---|
JP3963168B2 (en) | 2007-08-22 |
JP2005076629A (en) | 2005-03-24 |
KR20050023912A (en) | 2005-03-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BU, SUNG-HYUP;REEL/FRAME:014860/0129 Effective date: 20031226 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |