EP2674583B1 - Oil supply apparatus for engine provided with two-stage relief valve - Google Patents
Oil supply apparatus for engine provided with two-stage relief valve Download PDFInfo
- Publication number
- EP2674583B1 EP2674583B1 EP12172117.9A EP12172117A EP2674583B1 EP 2674583 B1 EP2674583 B1 EP 2674583B1 EP 12172117 A EP12172117 A EP 12172117A EP 2674583 B1 EP2674583 B1 EP 2674583B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outlet side
- working fluid
- speed
- relief valve
- engine
- 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.)
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Links
- 239000012530 fluid Substances 0.000 claims description 62
- 238000005461 lubrication Methods 0.000 description 13
- 239000000446 fuel Substances 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/16—Controlling lubricant pressure or quantity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
Definitions
- the present invention relates to an oil supply apparatus for an engine provided with a two-stage relief valve, and more particularly, to an oil supply apparatus for an engine provided with a two-stage relief valve capable of reducing a rotational load of an engine and improving fuel efficiency by relieving a supply oil pressure at two stages of a medium speed range and a high speed range of the engine using the oil supply apparatus to prevent excessive supply of an oil pressure to the engine requiring lubrication.
- an engine requires a lubrication apparatus that can lubricate operating components such as a piston and a crankshaft.
- the lubrication apparatus requires an oil supply apparatus such as an oil pump that can supply a working fluid such as oil to places where a lubrication operation is needed.
- a rotor-type oil supply apparatus is connected to a crankshaft to be used to adjust an ejected amount of a working fluid in proportion to an engine speed. Accordingly, a flow rate of an ejected working fluid of a conventional oil supply apparatus is increased in proportion to the engine speed.
- DE 199 52 287 A1 discloses a pressure relief valve characterized by two flow paths that can be unblocked in order to reduce the oil pressure and consequently to supply reduced amounts of working fluid. Said flow paths are unblocked one after the other at pre-determined oil pressure conditions in such a way that at high speed-range of engine they are both kept unblocked. This apparatus does not solve the technical problem posed by the art.
- the present invention provides an oil supply apparatus for an engine provided with a two-stage relief valve, in which a sufficient amount of working fluid is supplied in proportion to an engine speed in a low speed range where sufficient lubrication is not performed and a flow rate of the working fluid is reduced in a medium and high speed range where smooth lubrication is performed to reduce a rotational load applied to a crankshaft, capable of reducing an engine load to decrease fuel consumption to improve fuel efficiency as well as improving a lubrication operation through supply of an appropriate flow rate.
- the present invention is directed to an oil supply apparatus for an engine provided with a two-stage relief valve including: an oil pump housing having an inlet side and an outlet side configured to enable entry and exit of a working fluid; a rotor mounted in the oil pump housing and driven in proportion to an engine speed; a relief valve operated by a pressure of the working fluid between the inlet side and the outlet side; and first and second flow paths formed between the inlet side and the relief valve, wherein the relief valve is elastically supported and opened in a sequence from a low speed, a medium speed, a medium/high speed, and a high speed in proportion to the engine speed, and a working fluid amount of the outlet side is returned to the inlet side through the first or second flow path in proportion to the engine speed at the medium speed and the high speed.
- the relief valve may block the first and second flow paths regardless of the working fluid pressure of the outlet side when the rotor is rotated at the low speed, may be opened by a hydraulic pressure of the outlet side to return a portion of the working fluid of the outlet side to the inlet side through the second flow path when the rotor is rotated at the medium speed, may be further opened by the hydraulic pressure of the outlet side to block the first and second flow paths when the rotor is rotated at the medium/high speed, and may be opened by the hydraulic pressure of the outlet side to return a portion of the working fluid of the outlet side to the inlet side through the first flow path when the rotor is rotated at the high speed.
- the relief valve may include: a valve housing having both ends connected to branch pipes branched from the inlet side and the outlet side, respectively; a valve body having a fluid path hole to communicate the outlet side with the second flow path at the medium speed, and installed in the valve housing to communicate the outlet side with the first flow path at the high speed; and an elastic spring mounted in the valve housing to provide a recovering force to the valve body operated by the working fluid pressure introduced from the outlet side.
- FIG. 1 is a partial cross-sectional view showing a configuration of an oil supply apparatus in accordance with an exemplary embodiment of the present invention
- FIG. 2A is a schematic view for explaining operation states of the oil supply apparatus in accordance with an exemplary embodiment of the present invention.
- arrows shown in dotted lines represent conveyance directions of the working fluid.
- An oil supply apparatus 1000 in accordance with an exemplary embodiment of the present invention includes an oil pump housing 100 and a rotor 200 configured to supply a working fluid in proportion to an engine speed, a relief valve 300 configured to return a portion of the working fluid of an output side to an input side, a first flow path 400 configured to form a flow path such that a portion of the working fluid output from the oil pump housing 100 is returned when the engine speed is at a medium speed, and a second flow path 500 configured to form a flow path such that a portion of the working fluid output from the oil pump housing 100 is returned when the engine speed is at a high speed.
- the oil pump housing 100 has inner teeth 130 formed therein, and an inlet side 110 and an outlet side 120 formed at both sides thereof and configured to receive the working fluid and discharge the working fluid at a predetermined pressure.
- a branch pipe 111 is provided at the inlet side 110 to receive the working fluid returned from the relief valve 300, and another branch pipe 121 is provided at the outlet side 120 to divide the working fluid to the relief valve 300.
- the branch pipes 111 and 121 are connected to both ends of the relief valve 300, respectively.
- the relief valve 300 includes a valve housing 310 having both ends connected to the branch pipes 111 and 121, respectively, a valve body 320 installed in the valve housing 310 and operating in a longitudinal direction thereof, and an elastic spring 330 configured to provide a constant elastic force to the valve body 320.
- the valve housing 310 has a hollow cylindrical shape, and is provided with both ends connected to the branch pipes 111 and 121 to receive a working fluid pressure from the inlet side 110 and the outlet side 120.
- the valve body 320 has a compartment 321a formed at one side thereof and configured to receive the working fluid through the branch pipe 121, and a seat surface 322 formed at the other side and on which the elastic spring 330 is mounted.
- the compartment 321a has a fluid path hole 321 through which the working fluid of the outlet side 120 is returned to the inlet side 110.
- the fluid path hole 321 is formed at a position that can be in communication with the second flow path 500 (described later) when the engine speed is at a medium speed.
- the compartment 321a is manufactured to have a length such that the first and second flow paths 400 and 500 are blocked when the engine speed is at a medium/high speed or less and the branch pipe 121 is in communication with the first flow path 400 when the engine speed is at a high speed.
- the elastic spring 330 functions to provide an elastic force to a rear portion of the valve body 320 to allow the valve body 320 to block the outlet side 120 in the valve housing 310.
- the elastic spring 330 is installed to be supported in the valve housing 310 at one end and seated on the seat surface 322 at the other end.
- the first flow path 400 and the second flow path 500 are flow paths formed to communicate between the inlet side 110 and the valve housing 310.
- the first flow path 400 and the second flow path 500 are formed to sandwich the fluid path hole 321 therebetween.
- a position of the fluid path hole 321 is shown when the valve body 320 is closed by the elastic force of the elastic spring 330 and the working fluid pressure of the inlet side 110.
- the first flow path 400 configured as described above is kept closed by the valve body 320, and is connected to be in communication with the inlet side 110 only when the valve body 320 is opened by a pressure of the outlet side 120 while the engine is rotated at a high speed.
- the second flow path 500 is kept closed by the valve body 320, and is connected to be in communication with the fluid path hole 321 to communicate the outlet side 120 with the inlet side 110 as the valve body 320 is opened by the pressure of the outlet side 120 while the engine is rotated at a medium speed.
- FIGS. 2A to 2D are schematic views for explaining operation states of the oil supply apparatus in accordance with an exemplary embodiment of the present invention
- FIG. 3 is a graph showing a relation between a pressure of a working fluid of the oil supply apparatus in accordance with an exemplary embodiment of the present invention and an engine speed.
- arrows shown in dotted lines represent a conveyance direction of the working fluid
- arrows shown in solid lines represent a returned direction of the working fluid
- a dotted line represents a pressure variation line increased in proportion to the engine speed.
- the oil supply apparatus 1000 in accordance with an exemplary embodiment of the present invention is divided into a low speed range A, a medium speed range B, a medium/high speed range C and a high speed range D, which have different pressures of the working fluid.
- the pressure of the outlet side 120 is higher than that of the inlet side 110 due to an increase in engine speed.
- the valve body 320 moves leftward in a longitudinal direction of the valve housing 310 to be opened, the fluid path hole 321 is in communication with the second flow path 500.
- the pressure of the outlet side 120 is partially returned to the inlet side 110 through the second flow path 500 to be decreased below the dotted line, which represents a graph in proportion to the engine speed, as shown in FIG. 3 .
- the valve body 320 is further pushed leftward. Accordingly, the fluid path hole 321 in communication with the second flow path 500 is blocked to prevent the pressure of the outlet side 120 from returning to the inlet side 110.
- the pressure of the outlet side 120 is increased, and at this time, since the pressure in the medium/high speed range C is reduced under the pressure already decreased from the medium speed range B as shown in FIG. 3 , the pressure is increased from the low pressure to a pressure in proportion to the engine speed.
- the flow rate of the working fluid can be supplied according to an amount required by the lubrication operation, and thus, the load applied to the engine can be reduced to decrease the fuel consumption and improve the engine output.
- the oil supply apparatus for an engine provided with a two-stage relief valve in accordance with the present invention has the following effects.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Description
- The present invention relates to an oil supply apparatus for an engine provided with a two-stage relief valve, and more particularly, to an oil supply apparatus for an engine provided with a two-stage relief valve capable of reducing a rotational load of an engine and improving fuel efficiency by relieving a supply oil pressure at two stages of a medium speed range and a high speed range of the engine using the oil supply apparatus to prevent excessive supply of an oil pressure to the engine requiring lubrication.
- In general, an engine requires a lubrication apparatus that can lubricate operating components such as a piston and a crankshaft. In particular, the lubrication apparatus requires an oil supply apparatus such as an oil pump that can supply a working fluid such as oil to places where a lubrication operation is needed.
- In particular, a rotor-type oil supply apparatus is connected to a crankshaft to be used to adjust an ejected amount of a working fluid in proportion to an engine speed. Accordingly, a flow rate of an ejected working fluid of a conventional oil supply apparatus is increased in proportion to the engine speed.
- However, since such an oil supply apparatus ejects the working fluid in proportion to the engine speed regardless of a lubrication state of a portion at which lubrication is needed, fuel efficiency of the engine may be decreased. That is, since a sufficient amount of working fluid is not supplied when the engine is started, it is necessary to supply the sufficient amount of working fluid in proportion to the engine speed. However, since the sufficient amount of working fluid can be supplied when the engine speed is at a medium speed and a high speed, if the working fluid is supplied in proportion to the engine speed, the working fluid may be excessively supplied. In addition, since unnecessary power consumption occurs in the oil supply apparatus due to supply of the excessive amount of working fluid at the medium speed and the high speed, the fuel efficiency of the engine may be decreased.
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DE 199 52 287 A1 discloses a pressure relief valve characterized by two flow paths that can be unblocked in order to reduce the oil pressure and consequently to supply reduced amounts of working fluid. Said flow paths are unblocked one after the other at pre-determined oil pressure conditions in such a way that at high speed-range of engine they are both kept unblocked. This apparatus does not solve the technical problem posed by the art. - In order to solve these problems, the present invention provides an oil supply apparatus for an engine provided with a two-stage relief valve, in which a sufficient amount of working fluid is supplied in proportion to an engine speed in a low speed range where sufficient lubrication is not performed and a flow rate of the working fluid is reduced in a medium and high speed range where smooth lubrication is performed to reduce a rotational load applied to a crankshaft, capable of reducing an engine load to decrease fuel consumption to improve fuel efficiency as well as improving a lubrication operation through supply of an appropriate flow rate.
- In order to accomplish the object, the present invention is directed to an oil supply apparatus for an engine provided with a two-stage relief valve including: an oil pump housing having an inlet side and an outlet side configured to enable entry and exit of a working fluid; a rotor mounted in the oil pump housing and driven in proportion to an engine speed; a relief valve operated by a pressure of the working fluid between the inlet side and the outlet side; and first and second flow paths formed between the inlet side and the relief valve, wherein the relief valve is elastically supported and opened in a sequence from a low speed, a medium speed, a medium/high speed, and a high speed in proportion to the engine speed, and a working fluid amount of the outlet side is returned to the inlet side through the first or second flow path in proportion to the engine speed at the medium speed and the high speed.
- In particular, the relief valve may block the first and second flow paths regardless of the working fluid pressure of the outlet side when the rotor is rotated at the low speed, may be opened by a hydraulic pressure of the outlet side to return a portion of the working fluid of the outlet side to the inlet side through the second flow path when the rotor is rotated at the medium speed, may be further opened by the hydraulic pressure of the outlet side to block the first and second flow paths when the rotor is rotated at the medium/high speed, and may be opened by the hydraulic pressure of the outlet side to return a portion of the working fluid of the outlet side to the inlet side through the first flow path when the rotor is rotated at the high speed.
- In addition, the relief valve may include: a valve housing having both ends connected to branch pipes branched from the inlet side and the outlet side, respectively; a valve body having a fluid path hole to communicate the outlet side with the second flow path at the medium speed, and installed in the valve housing to communicate the outlet side with the first flow path at the high speed; and an elastic spring mounted in the valve housing to provide a recovering force to the valve body operated by the working fluid pressure introduced from the outlet side.
- The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail example embodiments thereof with reference to the attached drawings, in which:
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FIG. 1 is a partial cross-sectional view showing a configuration of an oil supply apparatus in accordance with an exemplary embodiment of the present invention; -
FIGS. 2A to 2D are schematic views for explaining operation states of the oil supply apparatus in accordance with an exemplary embodiment of the present invention; and -
FIG. 3 is a graph showing a relation between a pressure of a working fluid of the oil supply apparatus in accordance with an exemplary embodiment of the present invention and an engine speed. - Hereinafter, example embodiments of the present invention will be described in detail with reference to the accompanying drawings. Terms used herein and the following claims should not be construed as limited to conventional or dictionary definition but as meanings and concepts meeting with the technical spirit of the present invention based on the principle that the inventor could appropriately define concepts of the terms to described the best mode of the invention.
- Accordingly, it will be appreciated by those skilled in the art that the detailed description given herein with respect to these figures is for explanatory purposes as the invention extends beyond these limited embodiments, and various equivalents, modifications and variations may be made in these embodiments without departing from the principles and spirit of the general inventive concept.
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FIG. 1 is a partial cross-sectional view showing a configuration of an oil supply apparatus in accordance with an exemplary embodiment of the present invention, andFIG. 2A is a schematic view for explaining operation states of the oil supply apparatus in accordance with an exemplary embodiment of the present invention. InFIG. 2A , arrows shown in dotted lines represent conveyance directions of the working fluid. - An
oil supply apparatus 1000 in accordance with an exemplary embodiment of the present invention includes anoil pump housing 100 and arotor 200 configured to supply a working fluid in proportion to an engine speed, arelief valve 300 configured to return a portion of the working fluid of an output side to an input side, afirst flow path 400 configured to form a flow path such that a portion of the working fluid output from theoil pump housing 100 is returned when the engine speed is at a medium speed, and asecond flow path 500 configured to form a flow path such that a portion of the working fluid output from theoil pump housing 100 is returned when the engine speed is at a high speed. - Hereinafter, these components will be described in detail as follows.
- The
oil pump housing 100 hasinner teeth 130 formed therein, and aninlet side 110 and anoutlet side 120 formed at both sides thereof and configured to receive the working fluid and discharge the working fluid at a predetermined pressure. - In particular, a
branch pipe 111 is provided at theinlet side 110 to receive the working fluid returned from therelief valve 300, and anotherbranch pipe 121 is provided at theoutlet side 120 to divide the working fluid to therelief valve 300. Thebranch pipes relief valve 300, respectively. - The
rotor 200 is a rotary body, which is conventionally connected to a crankshaft of an engine and driven in proportion to a speed of the engine. In particularly, therotor 200 hasouter teeth 210 formed at an outer circumference thereof. Theouter teeth 210 compress a space between theinner teeth 130 and theouter teeth 210 to pressurize the working fluid filled therein as therotor 200 is rotated. Driving of therotor 200 is conventionally performed by a well known configuration of a rotor-type oil pump, and thus, detailed description thereof will be omitted. - The
relief valve 300 includes avalve housing 310 having both ends connected to thebranch pipes valve body 320 installed in thevalve housing 310 and operating in a longitudinal direction thereof, and anelastic spring 330 configured to provide a constant elastic force to thevalve body 320. - The
valve housing 310 has a hollow cylindrical shape, and is provided with both ends connected to thebranch pipes inlet side 110 and theoutlet side 120. - The
valve body 320 has acompartment 321a formed at one side thereof and configured to receive the working fluid through thebranch pipe 121, and aseat surface 322 formed at the other side and on which theelastic spring 330 is mounted. - In particular, the
compartment 321a has afluid path hole 321 through which the working fluid of theoutlet side 120 is returned to theinlet side 110. Here, thefluid path hole 321 is formed at a position that can be in communication with the second flow path 500 (described later) when the engine speed is at a medium speed. - In addition, the
compartment 321a is manufactured to have a length such that the first andsecond flow paths branch pipe 121 is in communication with thefirst flow path 400 when the engine speed is at a high speed. - The
elastic spring 330 functions to provide an elastic force to a rear portion of thevalve body 320 to allow thevalve body 320 to block theoutlet side 120 in thevalve housing 310. Theelastic spring 330 is installed to be supported in thevalve housing 310 at one end and seated on theseat surface 322 at the other end. - The
first flow path 400 and thesecond flow path 500 are flow paths formed to communicate between theinlet side 110 and thevalve housing 310. Here, thefirst flow path 400 and thesecond flow path 500 are formed to sandwich thefluid path hole 321 therebetween. In addition, as shown inFIG. 2A , a position of thefluid path hole 321 is shown when thevalve body 320 is closed by the elastic force of theelastic spring 330 and the working fluid pressure of theinlet side 110. - The
first flow path 400 configured as described above is kept closed by thevalve body 320, and is connected to be in communication with theinlet side 110 only when thevalve body 320 is opened by a pressure of theoutlet side 120 while the engine is rotated at a high speed. - In addition, the
second flow path 500 is kept closed by thevalve body 320, and is connected to be in communication with thefluid path hole 321 to communicate theoutlet side 120 with theinlet side 110 as thevalve body 320 is opened by the pressure of theoutlet side 120 while the engine is rotated at a medium speed. -
FIGS. 2A to 2D are schematic views for explaining operation states of the oil supply apparatus in accordance with an exemplary embodiment of the present invention; andFIG. 3 is a graph showing a relation between a pressure of a working fluid of the oil supply apparatus in accordance with an exemplary embodiment of the present invention and an engine speed. In addition, inFIGS. 2A to 2D , arrows shown in dotted lines represent a conveyance direction of the working fluid, and arrows shown in solid lines represent a returned direction of the working fluid, and inFIG. 3 , a dotted line represents a pressure variation line increased in proportion to the engine speed. - As will be described below, the
oil supply apparatus 1000 in accordance with an exemplary embodiment of the present invention is divided into a low speed range A, a medium speed range B, a medium/high speed range C and a high speed range D, which have different pressures of the working fluid. - First, in the low speed range A, for example, when the engine speed is less than 1000 RPM, as shown in
FIG. 2A , since the magnitude of a force obtained by summing the pressure of theinlet side 110 and the elastic force of theelastic spring 330 is larger than that by the pressure of theoutlet side 120, both thefirst flow path 400 and thesecond flow path 500 are kept closed by thevalve body 320. As a result, the pressure of the working fluid output from theoutlet side 120 is increased in proportion to the RPM of therotor 200, i.e., the engine speed. - In addition, in the medium speed range B, for example, when the engine speed is between 1000 and 3000 RPM, as shown in
FIG. 2B , the pressure of theoutlet side 120 is higher than that of theinlet side 110 due to an increase in engine speed. As a result, as thevalve body 320 moves leftward in a longitudinal direction of thevalve housing 310 to be opened, the fluid path hole 321 is in communication with thesecond flow path 500. - Accordingly, the pressure of the
outlet side 120 is partially returned to theinlet side 110 through thesecond flow path 500 to be decreased below the dotted line, which represents a graph in proportion to the engine speed, as shown inFIG. 3 . - In addition, in the medium/high speed range C, for example, when the engine speed is between 3000 and 3500 RPM, as shown in
FIG. 2C , as the pressure of theoutlet side 120 is higher than that of the medium speed range B, thevalve body 320 is further pushed leftward. Accordingly, the fluid path hole 321 in communication with thesecond flow path 500 is blocked to prevent the pressure of theoutlet side 120 from returning to theinlet side 110. - Therefore, the pressure of the
outlet side 120 is increased, and at this time, since the pressure in the medium/high speed range C is reduced under the pressure already decreased from the medium speed range B as shown inFIG. 3 , the pressure is increased from the low pressure to a pressure in proportion to the engine speed. - Finally, in the high speed range D, for example, when the engine speed is 3500 RPM or more, as shown in
FIG. 2D , as the pressure of theoutlet side 120 is higher than that of the medium/high speed range C, thevalve body 320 is further pushed leftward. Accordingly, thefirst flow path 400 blocked by thevalve body 320 is opened, a hydraulic pressure of theoutlet side 120 is partially returned to theinlet side 110 to decrease an output hydraulic pressure as shown inFIG. 3 . - As described above, as the present invention relieves the supply oil pressure at two stages of the medium speed range and the high speed range of the vehicle, the flow rate of the working fluid can be supplied according to an amount required by the lubrication operation, and thus, the load applied to the engine can be reduced to decrease the fuel consumption and improve the engine output.
- As can be seen from the foregoing, the oil supply apparatus for an engine provided with a two-stage relief valve in accordance with the present invention has the following effects.
- 1) Since the large amount of working fluid is supplied when the substantial lubrication is not performed, for example, at the beginning of the engine start, and the supply amount of the working fluid is reduced to supply an appropriate amount of working fluid required for the lubrication when the excessive working fluid is supplied, for example, at the engine speed in the medium speed range and the high speed range, a lubrication effect can be increased.
- 2) As the working fluid amount is reduced in the medium speed range and the high speed range, the rotational load applied to the crankshaft is reduced, and thus, the fuel consumption of the engine is also reduced, improving the fuel efficiency.
- 3) Since the load applied to the engine by the oil supply apparatus in the medium/high speed is reduced, the engine output in this range is improved.
- 4) The structure can be simplified to obtain the effect of the present invention at a minimum cost.
- While the invention has been shown and described with reference to certain example embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
- An oil supply apparatus for an engine provided with a two-stage relief valve, comprising:an oil pump housing (100) having an inlet side (110) and an outlet side (120) configured to enable entry and exit of a working fluid;- a rotor (200) mounted in the oil pump housing (100) and driven in proportion to an engine speed;a relief valve (300) operated by a pressure of the working fluid between the inlet side (110) and the outlet side (120); andfirst and second flow paths (400, 500) formed between the inlet side (110) and the relief valve (300),wherein the relief valve (300) is elastically supported and opened in a sequence from a low speed, a medium speed, a medium/high speed, anda high speed in proportion to the engine speed, and a working fluid amount of the outlet side (120) is returned to the inlet side (110) through the first or second flow path (400 or 500) in proportion to the engine speed at the medium speed and the high speed,SAID APPARATUS BEING CHARACTERISED IN THATthe relief valve (300) blocks the first and second flow paths (400, 500) regardless of the working fluid pressure of the outlet side (120) when the rotor (200) is rotated at the low speed,is opened by a hydraulic pressure of the outlet side (120) to return a portion of the working fluid of the outlet side (120) to the inlet side (110) through the second flow path (500) when the rotor (200) is rotated at the medium speed,is further opened by the hydraulic pressure of the outlet side (120) to block the first and second flow paths (400, 500) when the rotor (200) is rotated at the medium/high speed, andis opened by the hydraulic pressure of the outlet side (120) to return a portion of the working fluid of the outlet side (120) to the inlet side (110) through the first flow path (400) when the rotor (200) is rotated at the high speed.
- The oil supply apparatus according to claim 1, wherein the relief valve (300) comprises:a valve housing (310) having both ends connected to branch pipes (111, 121) branched from the inlet side (110) and the outlet side (120), respectively;a valve body (320) having a fluid path hole (321) to communicate the outlet side (120) with the second flow path (500) at the medium speed,and installed in the valve housing (310) to communicate the outlet side (120) with the first flow path (400) at the high speed; andan elastic spring (330) mounted in the valve housing (310) to provide a recovering force to the valve body (320) operated by the working fluid pressure introduced from the outlet side (120).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12172117.9A EP2674583B1 (en) | 2012-06-15 | 2012-06-15 | Oil supply apparatus for engine provided with two-stage relief valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12172117.9A EP2674583B1 (en) | 2012-06-15 | 2012-06-15 | Oil supply apparatus for engine provided with two-stage relief valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2674583A1 EP2674583A1 (en) | 2013-12-18 |
EP2674583B1 true EP2674583B1 (en) | 2016-07-20 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12172117.9A Active EP2674583B1 (en) | 2012-06-15 | 2012-06-15 | Oil supply apparatus for engine provided with two-stage relief valve |
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EP (1) | EP2674583B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106762014A (en) * | 2015-11-23 | 2017-05-31 | 湖南机油泵股份有限公司 | A kind of novel efficient lubricating oil pump |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19631296C2 (en) * | 1996-08-02 | 1999-06-10 | Ford Global Tech Inc | Device for limiting the oil pressure in the lubricating oil circuit of an internal combustion engine |
JP2001050411A (en) * | 1999-08-04 | 2001-02-23 | Unisia Jecs Corp | Relief valve device |
JP2004232670A (en) * | 2003-01-28 | 2004-08-19 | Aisin Seiki Co Ltd | Relief valve mechanism of oil pump |
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2012
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