CN1072311C - Fuel pumps for internal combustion engines - Google Patents
Fuel pumps for internal combustion engines Download PDFInfo
- Publication number
- CN1072311C CN1072311C CN96111717A CN96111717A CN1072311C CN 1072311 C CN1072311 C CN 1072311C CN 96111717 A CN96111717 A CN 96111717A CN 96111717 A CN96111717 A CN 96111717A CN 1072311 C CN1072311 C CN 1072311C
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- CN
- China
- Prior art keywords
- pump
- pumping
- chamber
- pressure
- motor
- 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.)
- Expired - Fee Related
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Reciprocating Pumps (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A pump comprises a pump chamber (3) for pumping liquid, at least one part of which comprises a pumping device (6) having a pumping area (A2); a work chamber (2) connected to a pressure liquid source, at least one part of which comprises a work device (5) having a work area (A1); and a connection device (7) pumping device which connects the work device to the pumping device, and so at least during the period when liquids need pumping by the pump, the pressure change of the work chamber influences the movement of the work device, which in turn influences the movement of the pumping device, so that a liquid can input and output from the pump chamber. The pump is characterized in that the pressure in the pump chamber is bigger than that in the work chamber.
Description
The present invention relates to pump, especially relate to the pump that is suitable as pump fuel.
By the internal-combustion engine that work is carried out in the burning of fuel oil and air, this is known.In some motor, the fuel feeding demand of motor is with relevant by the determined predetermined air stream in the position of throttle valve in the engine air inlet tube.This motor of part can be the oil spout type motor with the motor of other form, wherein measure the fuel oil input engine chamber of deal, in order to obtain to be convenient to the desirable air/fuel ratio of combustion ignition, this fuel oil preferably becomes entrained in the gas of desired amount.Obtain this air/fuel than being very important, because if this is than too high, then combustion mixture is incited somebody to action too thin so that can not be carried out combustion ignition.If should be than too little, then combustion mixture will be rich in fuel oil, so motor will typically be easy to catch fire.Usually, fail to control this air/fuel exactly than causing producing too much exhaust emissions.
Therefore, desirable is as far as possible accurately to measure the firing chamber of the fuel delivery internal-combustion engine of deal.In the system of the fuel delivery motor that will measure deal with pressurized gas, control gaseous pressure (especially combustion/draught head) and the injection timing of obtaining desirable spray characteristic (fuel-oil atmozation and/or fuel oil distribute) also are very important.For this purpose, this air or gas compressor need have usually through optional features carefully, so that reach the purpose of above-mentioned requirements.
Usually, the fuel pump that is used for conventional internal-combustion engine is an electric fuel punp, this pump according to the requirement of driving with required amount of fuel supply engine.This pump be usually located in the fuel tank and
Its size will satisfy the needs of the maximum fuel amount of motor, will allow some fuel oil recirculation in addition and returns this fuel tank.Under motor is in running on the lower load, will there be quite a large amount of Fuel Remaineds to return fuel tank, therefore, because this oil pump carries out unwanted pump oil and will consume a considerable amount of energy.This situation exists in fuel injection engine really, because this motor requires fuel pressure quite high usually, is typically 4 to 7 crust.Even because this electric fuel punp also will consume quite high energy when motor is in running on the lower load work, therefore have a large amount of heats usually from this pump and be input in the fuel oil, the result causes fuel oil to produce evaporation.
For fear of by oil pump waste energy, the fuel oil of having developed the various fuel feeding of attempting to make oil pump and motor needs the system of mating better.Usually this just requires oil pump work to be under the control of control unit (being generally electronic control unit ECU), and oil pump wherein can effectively open or close according to the demand of motor to fuel oil.One oil storage system normally is used for remaining on oil pump when closing with fuel oil with required pressure feed motor.Because the fuel demand of motor may change during use, therefore connecting and close this oil pump repeatedly will cause its accelerated wear test.Although the energy that the oil pump of this dexterity is littler than previous system consumption really, they are general more complicated more expensive and also use a return tube that passes to fuel tank usually, thereby guarantee at this injection system the fuel evaporation problem not to take place.
In addition, whether the work of electric fuel punp is no matter control according to fuel demand or other and all requires the use electric energy, and this point is under some use occasion, application as mini engine, such as motor scooter, outboard motor etc. may be shortcomings.
Another shortcoming of electric fuel punp is that this pump and corresponding power supply and controlling component are quite expensive.This point is a particular importance to the application of the above-mentioned mini engine of mentioning and/or the country very crucial to the cost of saving motor manufacturer and the end user situation of developing country (for example).
In some use occasion, such as motor scooter, it also is important that engine weight and space keep minimum.Therefore to be used for this use occasion be disadvantageous to electric fuel punp.
Therefore, the purpose of this invention is to provide a kind of internal-combustion engine pump, it can avoid waste energy, cost low, do not need electric energy when using, and weight is low, volume is little.
For achieving the above object, by the present invention, provide a kind of like this internal-combustion engine pump, it comprises: a booster cavity that is used for pumping liquid, this booster cavity have a pumping district; An actuation chamber that is communicated with a pressure fluid source, this actuation chamber has an activation zone, and this activation zone is different with the pumping district; One connection set, be used to connect activation zone and pumping district, so, at least need carry out pump period by this pump at liquid, the motion of the variable effect activation zone of pressure in this actuation chamber, this transfers again to influence the motion in pumping district, also this liquid is exported from this booster cavity so that make liquid supply with this booster cavity, wherein this pressure liquid source is provided by motor, and has constant relatively pressure reduction between this pumping liquid and pressure fluid.
This pump preferably has pressure amplification effect, and the pressure in the comparable actuation chamber of pressure that wherein produces in pressure in the booster cavity or the booster cavity is bigger.Act on pressure maximum in the described booster cavity in other words greater than pressure maximum by the output of described pressure fluid source.For this purpose, this activation zone is preferably greater than this pumping district.Consider this point, the opposite working of this pumping installations and actuator is long-pending can be calculated, thereby makes the pressure maximum that reaches desirable in the booster cavity.
Preferably, this pump is the two-fluid ejecting system pumping fuel of internal-combustion engine.Preferably a kind of two stroke crankcase scavenged of this internal-combustion engine.
This connection set is preferably by a connection chamber.This connection chamber communicates with atmosphere typically, or be used at this pump under the situation of the fuel oil that the pumping internal-combustion engine uses, it is communicated on the area that can reduce any danger relevant with fuel leakage, such as being communicated with the main air intake of motor or directly being communicated with engine crankcase under the situation of two-stroke crankcase scavenging motor.By this mode, any fuel leakage by this pump-unit all will be back in the motor, therefore avoid any result of occurring of not wishing.
This connection set is preferably a member of rigid pipe form basically, and two ends act on actuator and pumping installations respectively.
Preferably a kind of compressible fluid of this pressure fluid is as a kind of gas.
The fuel oil that is used for internal-combustion engine by the liquid of pump pumping.The fuel oil that the present invention simultaneously also is particularly useful for using in the IC engine supply is especially by an injection system fuel feeding.Can expect also other liquid of pumping expediently, as engine lubricating oil.
In the two stroke engine according to the work of crankcase scavenging principle, this actuation chamber is directly linked on the engine crankcase.In this motor,, require the pressure in the engine crankcase is amplified in order to obtain desired desirable fuel pressure.This point can be obtained less than the area of actuator by the area that makes this pumping installations.
The fuel oil that the motor that has realized that the fuel injection system that adopts two-fluid will measure deal sprays in company with pressurized gas and has some advantages, and is all the more so in the time of especially in the firing chamber that fuel oil is directly sprayed into two-cycle engine.
In this system, except that needs are provided with a pressure oil-source, also need a pressure gas source and pressure regulator, controlling the pressure reduction of oil between gentle, regulate thereby produce accurately fuel metering.
Accordingly, in a preferred embodiment, the fluid source that is used for this pump is one and is used for pressed gas supplied with and will measures the air compressor of the fuel injection of deal to the fuel injection system of motor.By this mode, although when not having regulator and compressor characteristics to change, still can reach and keep the desirable constant relatively pressure reduction between fuel oil and the pressed gas.Although the variation of compressor operating can cause gas pressure change, this pressure reduction will be maintained.This point is useful especially, as everybody knows in this oil/gas jet system, especially be that oil/draught head is an important Control Parameter in the system that finishes by " pressure-time " principle (not being that very sensitive positive displacement meter amount is opposite with variation to oil/draught head for example) at those fuel meterings.
Preferably this pumping installations or this actuator both or one of be diaphragm-type.
This pump is by the work of engine operation frequency.Even since the required oil mass of motor when high relatively load also comparatively speaking seldom, each circulate this actuator and pumping installations only need be done less relatively motion at motor.Therefore, this just makes that the application of diaphragm is that a kind of desirable low cost is selected.The motion that this each diaphragm is needed relatively little causes having only quite little stress on this each diaphragm.
Because this each diaphragm is quite cheap, but convection cell provides good sealing, have low frictional loss and have quickish dynamic response, so their use is particularly advantageous.Above-mentioned last specific character is excellent especially profit under the situation of fuel pumps for internal combustion engines, especially in this case all the more so, promptly when amount of fuel quite few, and engine speed is when quite high, the pumping of this pump is the fuel oil of (i.e. " demand " type pump) motor requirement constantly.In addition, different with the assembly that adopts piston and slipper seal with regard to production, do not require close tolerance or special surface finishment, so also there is superiority in the use of this each diaphragm.Because in fact this assembly does not need to carry out machining, therefore the processing cost of whole assembly is extremely low.
In a preferred embodiment, the liquid that is pumped is to carry with the deal of metering discontinuously in the downstream of pump.
By other form of the present invention, this pump can be used as the metering type pump, and wherein this actuation chamber first quarter stream device is connected with this pressure fluid source.By means of the pressure that adopts in this actuation chamber of throttling arrangement may command, therefore control moving or stroke of this actuator, this just can control moving or stroke of this pumping installations by this connection set.
The present invention can be suitable as the fuel metering pump further details can understand expressly with reference to the patent application in the trial of Australia of the applicant.The application number of this application is NO.PN3915, and the applying date is May 30 nineteen ninety-five, and the content of this application is incorporated herein by reference to.
Under the situation of multi-cylinder crankcase scavenging two-cycle engine, the crankcase that is preferably a cylinder is connected with actuation chamber as mentioned above, and the crankcase of the cylinder of another out of phase links to each other with this connection chamber.This will cause these actuator two ends to exist pressure bigger between bigger pressure reduction and actuation chamber and the booster cavity to amplify.This also will cause in that to refuel the power that acts in the pump in the stroke bigger.The number of degrees of other cylinder out of phase can change between 90 ° to 270 °, but will find that in this regard 180 ° is special tool superiority.
This booster cavity can be provided with into and outlet valve.Advance better characteristic with outlet valve and can comprise and make into and go out the valve biasing, so that this oiling valve drops to certain level according to the pressure in this booster cavity and responds when following and trend towards opening.Open when similarly, this outlet valve pressure of being biased in this actuation chamber surpasses certain level.Suitable biased member comprises spring and similar device.But this advances with the outlet valve one-way type.
This actuating or pumping installations can be by same mode by spring or similar device biasings, so that this booster cavity remains on and refuels or the oil suction state.
When motor is used for providing power to automobile/motor scooter etc., often change fuel demand according to operator's the needs that require.This change can the maximum fuel supply rate when peak output is worked changes to the zero fuel supply rate of neutral run duration when automobile downhill.When latter event, oil pump needn't be supplied with any point fuel oil to motor.
Therefore, in a preferred embodiment, be subjected to do the time spent from the pressure surge of pressure fluid source even work as this actuation chamber, this pumping installations can not carry out pumping yet when not needing pumping liquid or fuel oil.
In the example that provides,,, therefore can not produce pumping (so yet not work done of pump) because the outlet of this booster cavity can not be discharged any fuel oil although actuation chamber is subjected to the crankcase pressure wave action.Therefore, carry by this pump or the fuel oil of pumping can be better be complementary with total fuel demand of motor.This has just obtained desirable low-cost pattern, and this pattern causes energy dissipation to reduce to minimum so that the degree that does not have.
In a preferred embodiment of the invention, particularly when the time as the fuel of internal combustion engine pump, this pump can be arranged in the fuel tank, and the transport pipe that fuel oil is defeated by motor is arranged in the pipeline that fluid pressure source (for example crankcase under the situation of two stroke engine) and this pump are coupled together.Because the pumping of this fuel oil depends on the pressure at this obtainable fluid pressure source in actuation chamber place, the pipeline that therefore connects fluid pressure source and pump exists any crackle or leakage part that pump can't be worked, thereby stops this pump pumping fuel.This transport pipe can be arranged in the pressural fluid supply line road with one heart, therefore provides extra protection for this transport pipe.This structure is particularly useful in marine engine, and the existence of pressure transport pipe this moment (in this case between fuel tank and motor) may cause the secure context worry.This structure has been alleviated this worry, because if transport pipe breaks, the supply that then activates the pressed gas of this pump also will lose.
Although the present invention is particularly suitable for direct injection ic engine, this pump also can be used in the carburetor type motor.
This pump can be used as spare part or auxiliary equipment is sold.Because wherein each diaphragm with wearing and tearing service time, therefore sells separately these diaphragms or will be more suitably with secondary diaphragm with the kit form sale with primary diaphragm.
Said pump is suitable for producing the pressure that can be equal to mutually with the pressure by the generation of electric fuel oil metering pump, but the present invention's pump is with more cheap mode work.Should understand that also not as motor-drive pump, the present invention's pump does not have to cause that fuel oil carries out the motor of undesirable heating and evaporation.Therefore, can not adopt special cooling fuel oil with the present invention and eliminate the device of steam.
From the explanation of the preferred embodiment shown in the reference accompanying drawing, will more clearly understand the present invention.Wherein:
Fig. 1 is the generalized section of fuel pump of the present invention.
The present invention's fuel pump comprises: a housing 1 is arranged at a booster cavity 3 and an actuation chamber 2 in this housing 1.This booster cavity 3 is limited by the pumping installations of a primary diaphragm 6 forms and forms.This booster cavity 3 also is provided with oiling valve 4 and outlet valve 5, and links to each other with oil inlet passage 9 through this oiling valve 4, links to each other with oil discharge passage 10 through this outlet valve 5.Fuel oil is by these booster cavity 3 pumpings.
This actuation chamber 2 is limited by the actuator of a secondary diaphragm 15 forms and forms.Connection set 7 mechanically links to each other this secondary diaphragm 15 with primary diaphragm 6.Therefore, any motion of secondary diaphragm 15 will be directly passed to this primary diaphragm 6.
This actuation chamber 2 is communicated with the crankcase of motor (not shown) by a connecting tube joint 8 that is bearing on this housing 1.Therefore, this actuation chamber 2 is subjected to the effect of the fluctuation air pressure in this crankcase.
Between this primary diaphragm 6 and secondary diaphragm 15, be provided with a connection chamber 14.This connection chamber 14 communicates with atmosphere by vent 11.Therefore this secondary diaphragm 15 is subjected to the crankcase pressure effect facing to a side of this actuation chamber 2, and in motor each cycle period, this pressure is being lower than barometric pressure and is being higher than between the barometric pressure circulation change usually.Yet this secondary diaphragm 15 always is subjected to being essentially at least the effect of atmospheric pressure facing to an opposite side of this connection chamber.Therefore, in motor each cycle period, this secondary diaphragm 15 will away from or move towards this booster cavity 3.Because primary diaphragm 6 is directly connected on this secondary diaphragm 15, so the also direct shuttling movement by the shuttling movement of this secondary diaphragm 15 of this primary diaphragm 6.
Therefore, when this crankcase pressure is lower than barometric pressure, this secondary diaphragm will move away from this booster cavity 3, this primary diaphragm 6 will move equally, this will cause producing a vacuum in this booster cavity 3, thereby cause oiling valve 4 to be opened, so fuel oil can flow into this booster cavity 3, this outlet valve 5 keeps cutting out simultaneously.Correspondingly, when crankcase pressure is higher than barometric pressure, this secondary diaphragm 15 will be shifted to this booster cavity 3, thereby cause that this primary diaphragm is also in identical direction motion, finally cause this oiling valve 4 to be closed, and outlet valve 5 is opened, therefore with fuel delivery in motor and/or its injection system.
The activation zone A1 of this secondary diaphragm 15 is bigger than the pumping district A2 of this secondary diaphragm 6.Therefore the variation in pressure in the actuation chamber 2 is amplified effectively, forms higher variation in pressure in this booster cavity 3.Therefore, needed fuel pressure can be supplied with by this fuel pump.
Because the motion made according to the circular wave of gas pressure in the engine crankcase by secondary diaphragm 15 of fuel pump of the present invention activates, so the present invention do not need to use electric fuel punp, and the motion of this secondary diaphragm 15 is used to drive this fuel pump.
Also it is contemplated that and have other alternative pressure gas source.For example, be used to the pressurized air from air compressor in the two-fluid ejecting system, this air compressor also can provide fuel pump used pressure gas source.Irrelevant with this pressure gas source, the present invention can be provided at pressure reduction constant relatively between pumping fuel and the pressure gas source.
Claims (26)
1. internal-combustion engine pump, it comprises: a booster cavity that is used for pumping liquid, this booster cavity have a pumping district; An actuation chamber that is communicated with a pressure fluid source, this actuation chamber has an activation zone, and this activation zone is different with the pumping district; One connection set, be used to connect activation zone and pumping district, so, at least need carry out pump period by this pump at liquid, the motion of the variable effect activation zone of pressure in this actuation chamber, this transfers again to influence the motion in pumping district, also this liquid is exported from this booster cavity so that make liquid supply with this booster cavity, wherein this pressure liquid source is provided by motor, and has constant relatively pressure reduction between this pumping liquid and pressure fluid.
2. pump according to claim 1 is characterized in that: activation zone is greater than the pumping district, so this pump can produce pressure and amplify, so the pressure that produces in the pressure in this booster cavity or this booster cavity is greater than the pressure of this actuation chamber.
3. pump according to claim 1, it is characterized in that: it comprises that also a connection set passes connection chamber wherein.
4. as pump as described in the claim 2, it is characterized in that: it comprises that also a connection set passes connection chamber wherein.
5. as pump as described in the claim 3, it is characterized in that: this connection chamber is communicated with atmosphere.
6. as pump as described in the claim 3, it is characterized in that: this connection chamber is to be communicated with the suction port of motor.
7. as pump as described in the claim 3, it is characterized in that: this motor is that two-stroke crankcase scavenged and this connection chamber are communicated with engine crankcase.
8. as pump as described in the claim 4, it is characterized in that: this connection chamber is communicated with atmosphere.
9. as pump as described in the claim 4, it is characterized in that: this connection chamber is to be communicated with the suction port of motor.
10. as pump as described in the claim 4, it is characterized in that: this motor is that two-stroke crankcase scavenged and this connection chamber are communicated with engine crankcase.
11. as pump as described in each in the claim 3 to 10, it is characterized in that: this connection set is the rigid pipe form, and the motion in this activation zone and this pumping district is coupled together.
12. as claim 1 to 10 pump as described in each, it is characterized in that: this pump is used to a kind of two-fluid ejecting system pumping fuel of internal-combustion engine.
13. as claim 1 to 6 each, pump as described in 8 or 9, it is characterized in that: this motor is two stroke crankcase scavenged.
14. as claim 1 to 10 pump as described in each, it is characterized in that: this pressure fluid is a kind of compressible fluid.
15. as claim 1 to 6 each, pump as described in 8 or 9, it is characterized in that: this motor is the two-stroke crankcase scavenged, and pressure fluid source is in the crankcase.
16. as pump as described in the claim 15, it is characterized in that: this motor comprises one group of cylinder, the crankcase of a cylinder is connected on this actuation chamber, and the crankcase of another out of phase cylinder is connected with this connection chamber.
17. as claim 1 to 10 pump as described in each, it is characterized in that: pressure fluid source is an air compressor that is used for to the injection system supply pressure gas of motor.
18. as claim 1 to 10 pump as described in each, it is characterized in that: at least one of this pumping chamber and actuation chamber comprises a diaphragm, this diaphragm provides the pumping district in described pumping chamber or the activation zone of described actuation chamber.
19. as pump as described in the claim 11, it is characterized in that: at least one of this pumping chamber and actuation chamber comprises a diaphragm, this diaphragm provides the pumping district in described pumping chamber or the activation zone of described actuation chamber.
20. as pump as described in the claim 12, it is characterized in that: at least one of this pumping chamber and actuation chamber comprises a diaphragm, this diaphragm provides the pumping district in described pumping chamber or the activation zone of described actuation chamber.
21. as pump as described in the claim 13, it is characterized in that: at least one of this pumping chamber and actuation chamber comprises a diaphragm, this diaphragm provides the pumping district in described pumping chamber or the activation zone of described actuation chamber.
22. as claim 1 to 10 pump as described in each, it is characterized in that: the liquid of institute's pumping is carried to the downstream of this pump with the deal of metering discontinuously.
23. as claim 1 to 10 pump as described in each, it is characterized in that: it also comprises and prevents the device that carries out pumping under the predetermined operating mode of motor.
24., it is characterized in that it also comprises and being arranged between this actuation chamber and the pressure fluid source to control the throttling arrangement of the pressure in this actuation chamber as claim 1 to 10 pump as described in each.
25. as claim 1 to 10 pump as described in each, it is characterized in that: when as the internal-combustion engine oil pump, this pump is positioned at fuel tank, and has the transport pipe of fuel delivery being given motor, this transport pipe is arranged in pressure fluid source and the supply pipeline that pump links to each other.
26. as pump as described in the claim 25, it is characterized in that: fuel feed pipe is arranged in the supply pipeline with one heart.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPN3911 | 1995-06-30 | ||
| AUPN3911A AUPN391195A0 (en) | 1995-06-30 | 1995-06-30 | Fuel pumps for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1148139A CN1148139A (en) | 1997-04-23 |
| CN1072311C true CN1072311C (en) | 2001-10-03 |
Family
ID=3788247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96111717A Expired - Fee Related CN1072311C (en) | 1995-06-30 | 1996-06-28 | Fuel pumps for internal combustion engines |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH09119356A (en) |
| CN (1) | CN1072311C (en) |
| AU (1) | AUPN391195A0 (en) |
| TW (1) | TW311160B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206325B (en) * | 2013-04-23 | 2015-11-11 | 成都恒高机械电子有限公司 | A kind of fuel pump with safety valve |
| CN212928034U (en) * | 2020-09-08 | 2021-04-09 | 中国第一汽车股份有限公司 | High-pressure gasoline supply device |
| CN113137363B (en) * | 2021-04-26 | 2022-03-29 | 长春工业大学 | Valveless double-cavity resonance piezoelectric drive type insulin pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3467021A (en) * | 1968-02-12 | 1969-09-16 | Mec O Matic Inc | Fluid pressure operated pump |
-
1995
- 1995-06-30 AU AUPN3911A patent/AUPN391195A0/en not_active Abandoned
-
1996
- 1996-06-28 CN CN96111717A patent/CN1072311C/en not_active Expired - Fee Related
- 1996-06-28 TW TW085107839A patent/TW311160B/zh active
- 1996-07-01 JP JP8171332A patent/JPH09119356A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3467021A (en) * | 1968-02-12 | 1969-09-16 | Mec O Matic Inc | Fluid pressure operated pump |
Also Published As
| Publication number | Publication date |
|---|---|
| AUPN391195A0 (en) | 1995-07-27 |
| JPH09119356A (en) | 1997-05-06 |
| CN1148139A (en) | 1997-04-23 |
| TW311160B (en) | 1997-07-21 |
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