US20120134789A1 - Water Pump - Google Patents
Water Pump Download PDFInfo
- Publication number
- US20120134789A1 US20120134789A1 US13/253,579 US201113253579A US2012134789A1 US 20120134789 A1 US20120134789 A1 US 20120134789A1 US 201113253579 A US201113253579 A US 201113253579A US 2012134789 A1 US2012134789 A1 US 2012134789A1
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- Prior art keywords
- section
- pump
- shaft
- pump shaft
- outer peripheral
- 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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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/602—Drainage
- F05D2260/6022—Drainage of leakage having past a seal
Definitions
- FIG. 9 is a fragmentary front elevation showing an essential part of an eighth embodiment of the water pump according to the present invention.
- a front bearing seal 19 a and a rear bearing seal 19 b are respectively disposed at the front and rear end portions of inner and outer races 5 a, 5 b in order to prevent penetration of ducts and the like into the ball bearing 5 .
- Each bearing seal 19 a, 19 b is formed of an annular rubber material and has an outer peripheral portion fixed to an axial end portion of outer race 5 b and an inner peripheral portion slidably secured to an axial end portion of inner race 5 a thereby accomplishing sealing for the inside of ball bearing 5 .
- first two annular step portions respectively including outer peripheries 22 a, 22 b are formed around first annular face 22
- second two annular step portions respectively including outer peripheries 23 a, 23 b are formed around second annular face 22 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A water pump includes a pump shaft surrounded by a pump housing having a tubular section. A pulley having a cylindrical section and a flange wall is mounted on an end section of the pump shaft. An impeller is mounted on the other end section of the pump shaft. A mechanical seal is coaxially disposed between the tubular section and the pump shaft. A bearing is coaxially disposed between the tubular section of the pump housing and the cylindrical section of the pulley. In this water pump, the pump shaft includes a coaxial small diameter shaft section located at its first part which is located axially between the mechanical seal and the flange wall. The small diameter shaft section has a diameter smaller than a diameter of a second part of the pump shaft on which the mechanical seal is disposed so as to form an annular step portion.
Description
- This invention relates to a water pump, for example, for supplying the inside of an engine with coolant.
- A water pump as disclosed in Japanese Patent Provisional Publication No. 2004-84610 is known as one for supplying the inside of an engine with coolant. In summary, the water pump includes a pump housing inside which a pump shaft formed integral with a pulley under press-forming is disposed and rotatably supported through a ball bearing. Additionally, an impeller is fixed on a tip end section of the pump shaft. The ball bearing has an outer race fixed to the inner peripheral portion of the pulley and an inner race fixed on the outer peripheral surface of the tubular section of the pump housing. Additionally, a mechanical seal is disposed between the pump shaft and the pump housing to prevent coolant from leaking in a direction of from a pump chamber for rotatably accommodating the impeller to the ball bearing.
- However, in the water pump as disclosed in the above publication, it is difficult to completely prevent leaking of coolant from the pump chamber by the mechanical seal from the viewpoint of a structure. Accordingly, there is a fear that coolant leaking through the mechanical seal transfers through the outer peripheral surface of the pump shaft so as to penetrate into the ball bearing. As a result, the durability of the ball bearing unavoidably degraded owing to rust formation and the like.
- In view of the above actual conditions of the conventional water pump, an improved water pump according to the present invention has been devised. An object of the present invention is to provide the improved water pump configured to prevent coolant leaking through a mechanical seal from transferring through the pump shaft toward the bearing so that no coolant reaches the bearing.
- An aspect of the present invention resides in a water pump comprising a pulley including a cylindrical section located radially inward of an outer periphery of the pulley, the pulley being rotatable upon transmission of power from a driving force. A pump shaft is disposed radially inward of the cylindrical section of the pulley and fixed to the cylindrical section, the pump shaft having a first end section on which the pulley is mounted. A flange wall extends from an axial end portion of the cylindrical section of the pulley in a direction of the pump shaft. An impeller is disposed at a second end section of the pump shaft. A pump housing includes a tubular section disposed to surround the pump shaft. A mechanical seal is disposed between a radially inward side of the tubular section of the pump housing and an outer peripheral surface of the pump shaft. Additionally, a bearing is disposed between an inner peripheral surface of the cylindrical section of the pulley and the tubular section of the pump housing to rotatably support the pulley on the tubular section of the pump housing. In the above water pump, the pump shaft includes a coaxial small diameter shaft section located at its first part which is located axially between the mechanical seal and the flange wall. The small diameter shaft section has a diameter smaller than a diameter of a second part of the pump shaft on which the mechanical seal is disposed. The small diameter shaft section has an outer peripheral surface located radially inward of an outer peripheral surface of a third part of the pump shaft axially extending from the second part so as to form an annular step portion.
- Another aspect of the present invention resides in a water pump comprising a pulley including a cylindrical section located radially inward of an outer periphery of the pulley, the pulley being rotatable upon transmission of power from a driving force. A pump shaft is disposed radially inward of the cylindrical section of the pulley and fixed to the cylindrical section, the pump shaft having a first end section on which the pulley is mounted. A flange wall extends from an axial end portion of the cylindrical section of the pulley in a direction of the pump shaft. An impeller is disposed at a second end section of the pump shaft. A pump housing includes a tubular section disposed to surround the pump shaft. A mechanical seal is disposed between a radially inward side of the tubular section of the pump housing and an outer peripheral surface of the pump shaft. A bearing is disposed between an inner peripheral surface of the cylindrical section of the pulley and the tubular section of the pump housing to rotatably support the pulley on the tubular section of the pump housing. In the above water pump, the pump shaft includes a step portion located axially between the mechanical seal and the flange wall to restrict movement of adhering water transferred through the outer peripheral surface of the pump shaft from side of the mechanical seal in a direction toward the flange wall.
- A further aspect of the present invention resides in a water pump comprising a pump shaft having a first end section on which a pulley is disposed and a second end section on which an impeller is disposed. A pump housing is disposed surrounding an outer peripheral side of the pump shaft. A bearing is disposed to the pump housing to rotatably supporting the pump shaft. A mechanical seal is fixed to the pump housing and to the pump shaft and having a seal section which makes sliding at a position nearer to the impeller than to the bearing in an axial direction of the pump shaft. In the above water pump, a coaxial and annular groove is formed at the outer peripheral surface of the pump shaft and located at an axial position between the mechanical seal and the bearing to prevent adhering water from transferring in a direction toward the bearing.
- The other objects and features of this invention will become understood from the following description with reference to the accompanying drawings.
- In the drawings, like reference numerals designate like parts and elements throughout all figures, in which:
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FIG. 1 is a vertical sectional view of a first embodiment of a water pump according to the present invention; -
FIG. 2 is an exploded perspective view of the water pump ofFIG. 1 ; -
FIG. 3 is a fragmentary front elevation showing an essential part of a second embodiment of the water pump according to the present invention; -
FIG. 4 is a fragmentary front elevation partly in section showing an essential part of a third embodiment of the water pump according to the present invention; -
FIG. 5 is a fragmentary front elevation partly in section showing an essential part of a fourth embodiment of the water pump according to the present invention; -
FIG. 6 is a fragmentary front elevation showing an essential part of a fifth embodiment of the water pump according to the present invention; -
FIG. 7 is a fragmentary front elevation showing an essential part of a sixth embodiment of the water pump according to the present invention; -
FIG. 8 is a fragmentary front elevation showing an essential part of a seventh embodiment of the water pump according to the present invention; and -
FIG. 9 is a fragmentary front elevation showing an essential part of an eighth embodiment of the water pump according to the present invention. - Referring now to
FIGS. 1 and 2 of drawings, a first embodiment of a water pump according to the present invention is illustrated by the reference numeral 1. Water pump 1 is applied for a cooling system in which coolant containing anti-freezing liquid (ethylene glycol) is circulated between a radiator (not shown) and an engine (not shown) of an automotive vehicle. Water pump 1 is directly installed to a side section of a cylinder block (not shown) of the engine by means of bolt-securing or the like. Water pump 1 includes apump housing 2 having a part of apump chamber 3. Another part ofpump chamber 3 is formed in a front end section of the cylinder block. Apulley 4 is rotatably supported on an outer peripheral side ofpump housing 2 through a single ball bearing 5. Apump shaft 6 is axially disposed insidepump housing 2 and has a front orfirst end section 6 a fixed to thepulley 4. Animpeller 7 is fixed on a rear orsecond end section 6 b ofpump shaft 6 and rotatably accommodated inpump chamber 3. Amechanical seal 8 is interposed betweenpump housing 2 andpump shaft 6 to establish sealing betweenpump chamber 3 and ball bearing 5. -
Pump housing 2 is made of, for example, an aluminum alloy and formed into a one-piece structure.Pump housing 2 includes a pump housingmain body 9 and a tubular orcylindrical section 10 integral withmain body 9. Pump housingmain body 9 is located to define the part ofpump chamber 3 and is formed into a deformed annular shape.Tubular section 10 is formed integral with housingmain body 9 at a front end side and formed axially step-like and diametrically changing. Housingmain body 9 is formed at its rear end with an annular andflat installation face 9 a which is in contact with a flat surface portion located at a side section of the cylinder block. Housingmain body 9 includes an outer peripheral section (no numeral) having a plurality ofboss portions 9 c each of which is formed with a bolt-hole 9 b in which an installation bolt (not shown) is to be inserted. Additionally, this housingmain body 9 is formed thereinside with adischarge port 9 d through which coolant flowing intopump chamber 3 from a suction port (not shown) communicated with the radiator is discharged into the water jacket of the cylinder block under the rotation ofimpeller 7. - As shown in
FIGS. 1 and 2 ,tubular section 10 includes alarge diameter portion 10 a located at the side ofpump chamber 3. Anintermediate diameter portion 10 b is coaxially integral withlarge diameter portion 10 a and axially extends in the direction ofball bearing 5 fromlarge diameter portion 10 a. Asmall diameter portion 10 c is coaxially integral withintermediate diameter portion 10 b and axially extends in the direction offront end portion 6 a ofpump shaft 6 fromintermediate diameter portion 10 b. Accordingly, a diametricallystepwise space 10 d is formed inside thetubular section 10. -
Intermediate diameter portion 10 b is formed with adrain hole 11 which is vertically extends to pass through the wall of intermediate diameter portion and located at its lower side so that water droplets of coolant leaking throughmechanical seal 8 is flown downward from the drain hole. Adrain chamber 12 is formed below thedrain hole 11 and extends tolarge diameter portion 10 a in order to collect and store water droplets dropped fromdrain hole 11. Thisdrain chamber 12 has a lower end opening (no numeral) which is fluidly sealed with acap 13. - Additionally,
intermediate diameter portion 10 b is formed with a vent opening located at an upper side in the direction of gravity in order to discharge water vapor of coolant leaking frommechanical seal 8 or stored withindrain chamber 12, to the outside of water pump 1 or into the atmosphere. Further,intermediate diameter portion 10 b is formed at its inner peripheral side with anannular space chamber 15 which is defined between the inner wall ofintermediate diameter portion 10 b and the outer peripheral surface ofpump shaft 6. Thisannular space chamber 15 is vertically communicated withdrain hole 11 and ventopening 14. Furthermore,intermediate diameter portion 10 b has a cylindrical protrudingportion 10 f which is integrally formed protruding from the outer peripheral surface ofintermediate diameter portion 10 b. Cylindrical protrudingportion 10 f is formed thereinside with avent communication opening 18 through whichvent opening 14 is in communication with the atmosphere. - As shown in
FIGS. 1 and 2 ,pulley 4 is formed into a generally disc-shaped one piece structure by press-forming a metal plate material.Pulley 4 includes a centrally located cylindrical or cup-shapedfixing section 4 a into whichfront end section 6 a ofpump shaft 6 is press-fitted to be fixed there. An annular disc-shapedfirst flange wall 4 b is integral with fixingsection 4 a and radially extends from the peripheral portion of an axially one end of fixingsection 4 a. A large diametercylindrical section 4 c is integral withfirst flange wall 4 b and axially extends from the outer peripheral portion offlange wall 4 b. An annular disc-shaped large diametersecond flange wall 4 d is integral withcylindrical section 4 c and generally radially extends from the peripheral portion of an axially one end of thecylindrical section 4 c. A generally cylindricalbelt installation section 4 e is integral withsecond flange wall 4 d and axially extends from the outer peripheral portion ofsecond flange wall 4 d. - Fixing
section 4 a is formed with anair vent opening 4 f which is located at the central part of fixingsection 4 a to pierce the wall of the central part in order to accomplish a smooth press-fitting operation forpump shaft 6. Acover member 17 which will be discussed after is press-fitted onfitting section 4 a at the outer peripheral surface. - As illustrated in
FIG. 2 ,flange wall 4 b is formed with a plurality of through-holes 16 which are arranged at circumferentially generally equal intervals and along a circumference which is located at a radially central part offlange wall 4 b. These through-holes 16 serve as operational holes through which jigs (not shown) for press-fitting are inserted when aninner race 5 a ofball bearing 5 is press-fitted on the outer peripheral surface ofsmall diameter portion 10 c oftubular section 10. Besides, these through-holes 16 serve to discharge water vapor vaporized from the inside ofdrain chamber 12 and reaching the inside ofsmall diameter portion 10 c, to the outside. Accordingly, the position or the diameter of each through-hole 16 is suitably set to accomplish the above-discussed serves. -
Cylindrical section 4 c ofpulley 4 is so configured thatouter race 5 b ofball bearing 5 is press-fitted and fixed inside thecylindrical section 4 c at the inner peripheral surface. Accordingly, the axial length ofcylindrical section 4 c is slightly larger than that ofouter race 5 b ofball bearing 5, and the inner diameter ofcylindrical section 4 c is slightly smaller that the outer diameter ofouter race 4 c to effectively accomplish the press-fitting ofball bearing 5. -
Second flange wall 4 d ofpulley 4 formed bent to protrude in the direction ofimpeller 7 thereby obtaining a stiffness thereof. -
Belt installation section 4 e ofpulley 4 includes an outer peripheral portion having annular projections each of which projects radially outward and has a generally triangular cross-section. A transmission belt (not shown) passed on a drive pulley (not shown) fixed on a tip end section of a crankshaft (not shown) of the engine is further passed on the outer peripheral portion ofbelt installation section 4 e so that a rotational force of the crankshaft is transmitted topulley 4. -
Cover member 17 is formed of a thin metal plate and generally cup-shaped.Cover member 17 is disposed in such a manner as to cover the front surfaces offirst flange wall 4 b,cylindrical section 4 c andsecond flange wall 4 d. Additionally,cover member 17 has a centrally locatedcylindrical section 17 a which is press-fitted and fixed on the outer peripheral surface of fixingsection 4 a of thepulley 4. Anannular disc section 17 b is integral withcylindrical section 17 a and radially outwardly extends from the peripheral portion of an axial end of thecylindrical section 17 a. The inner surface ofdisc section 17 b covers the whole opposite surface offirst flange wall 4 b and disposed opposite tofirst flange wall 4 b forming an annular space S between thedisc section 17 b andfirst flange wall 4 b. Further, alarge diameter section 17 c is integral withdisc section 17 b and radially outwardly extends from the outer peripheral portion ofdisc section 17 b.Large diameter section 17 c is formed tapered in a direction of fromrear end section 6 b to thefront end section 6 a ofpump shaft 6. An annular outerperipheral section 17 d is integral withlarge diameter section 17 c and radially outwardly extends from the outer peripheral portion oflarge diameter section 17 c. Outerperipheral section 17 d is perpendicular to the axis ofpump shaft 6 and disposed opposite to the inner peripheral surface ofbelt installation section 4 e forming a clearance S3 while opposite to the front or inner surface of thesecond flange wall 4 d forming a slight annular clearance S1. Accordingly, thiscover member 17 closes the front end parts of through-holes 16 offirst flange wall 4 b thereby preventing penetration of dusts and the like from the outside while discharging water vapor evaporated fromdrain chamber 12 and the like and passing through through-holes 16, to the outside through clearances S, S1, S3. -
Ball bearing 5 is a general one and includesinner race 5 a press-fitted onsmall diameter portion 10 c,outer race 5 b press-fitted incylindrical section 4 c, and a plurality ofballs 5 c rotatably disposed between inner andouter races inner race 5 a is restricted by anannular projection 10 e formed at the front end portion ofintermediate diameter portion 10 b oftubular section 10. An axial position ofouter race 5 b can be set according to the positioning ofinner race 5 a when the inner race is press-fitted incylindrical portion 4 c. Additionally, an annular clearance S2 is formed between the front end portion ofball bearing 5 andfirst flange wall 4 b so as to introduce water vapor and the like toward through-holes 16. - A
front bearing seal 19 a and arear bearing seal 19 b are respectively disposed at the front and rear end portions of inner andouter races ball bearing 5. Each bearingseal outer race 5 b and an inner peripheral portion slidably secured to an axial end portion ofinner race 5 a thereby accomplishing sealing for the inside ofball bearing 5. - Additionally, also as illustrated in
FIG. 2 , ashield plate 20 formed of a thin and annular plate is fixed upon being interposed betweeninner race 5 a andannular projection 10 e ofintermediate diameter portion 10 b. Thisshield plate 20 is disposed in such a manner as to cover the rear end side or face ofball bearing 5 to prevent penetration of dusts and the like intoball bearing 5 from the outside. - As shown in
FIGS. 1 and 2 , pumpshaft 6 is formed of a metal material and has a generally equal outer diameter throughout whole the length.Pump shaft 6 is formed at its outerperipheral surface 6 c with a coaxial annular groove under cutting-out thereby defining a smalldiameter shaft section 21, located at a generally axially central part ofpump shaft 6. This smalldiameter shaft section 21 is formed at a position betweenmechanical seal 18 andfirst flange wall 4 b, i.e., at a position abutting onannular space chamber 15 so that the smalldiameter shaft section 21 is located insideannular space chamber 15. Smalldiameter shaft section 21 is interposed between a firstannular face 22 at the side ofmechanical seal 8 and a secondannular face 23 at the opposite side. The outer peripheral surface ofpump shaft 6 is contiguous with the outer peripheral surface of smalldiameter shaft section 21 through each of first and second annular faces 22, 23, forming an annular step portion. - Each of first and second annular faces 22, 23 is formed perpendicular to the axis of
pump shaft 6 and respectively haveouter peripheries hole 11 and ventopening 14 throughannular space chamber 15. Additionally, smalldiameter shaft section 21 has an axial length W of about 2 mm, corresponding to a width (W) between first and second annular faces 22, 23. A radial width D of each of first and second annular faces 22, 23 is set to be about 1 mm. The radial width D corresponds to a depth of the annular groove defined between first and second annular faces 22, 23, or a radial distance between the outer peripheral surface of smalldiameter shaft section 21 and the outer peripheral surface ofpump shaft 6. It is to be noted that the above-mentioned length W and distance D may be respectively set to be not less than 2 mm and not less than 1 mm. -
Impeller 7 is formed as a one-piece structure by press-forming and includes a cylindrical press-fittedfixing section 7 a which is press-fitted and fixed onrear end section 6 b ofpump shaft 6. A plurality ofblades 7 b are integral with fixingsection 7 a and radially extend from an axially end portion of fixingsection 7 a. Fixingsection 7 a is formed at its central part with anair vent opening 7 c for the purpose of smoothing a press-fit operation ofpump shaft 6. -
Mechanical seal 8 is a general one and includes acartridge section 8 a fixed to the inner peripheral surface ofintermediate diameter portion 10 b oftubular section 10. Asleeve section 8 b is supported on outerperipheral surface 6 c ofpump shaft 6. Aseal section 8 c is disposed between the inner peripheral surface ofcartridge section 8 a and the outer peripheral surface ofsleeve section 8 b and configured to make a fluid tight seal under sliding. - With the above arranged embodiment, when the crankshaft of the engine (driving source) is rotated to drivingly rotate
pulley 4,impeller 7 is rotated throughpump shaft 6 to make a pumping action so that coolant is fed under pressure fromdischarge port 9 d to the water jacket of the engine thereby accomplishing cooling of the engine. - At this time, a major part of high pressure coolant in
pump chamber 3 is prevented from flowing to the side of the front end section ofpump shaft 6 under the action ofmechanical seal 8; however, a part of high pressure coolant leaks out through slidingseal section 8 c ofmechanical seal 8 and flows through outerperipheral surface 6 c ofpump shaft 6 to the side of thefront end section 6 a ofpump shaft 6. When this flowing coolant reaches firstannular face 22 ofpump shaft 6, it splashes outwardly fromouter periphery 22 a of the firstannular face 22 to reachannular space chamber 15 under a centrifugal force due to rotation ofpump shaft 6, followed by dropping throughdrain hole 11 intodrain chamber 12 to be collected and stored there. Specifically, since firstannular face 22 is formed perpendicular to the axis ofpump shaft 6, coolant transferring through outerperipheral surface 6 c ofpump shaft 6 is rapidly cut atouter periphery 22 a of firstannular face 22 and splashes outwardly, and then drops throughdrain hole 11 intodrain chamber 12 to be stored there. Accordingly, almost whole coolant leaking throughmechanical seal 8 can be prevented from reaching the side of secondannular face 23 through the outer peripheral surface of smalldiameter shaft section 21 under effective coolant cutting and splashing effects by firstannular face 22. - Additionally, even if a small amount of coolant flows through the outer peripheral surface of small
diameter shaft section 21 to the side offront end section 6 a ofpump shaft 6, it flows to secondannular face 23 and cut byouter periphery 23 a of secondannular face 23 so as to splash outwardly thereby being drained intodrain chamber 12. This coolant stored indrain chamber 12 vaporizes to form water vapor. A major part of water vapor of coolant leaking throughmechanical seal 8 is discharged out of water pump 1 thoughannular space chamber 15 and thevent opening 14. Even in case that this water vapor flows fromannular space chamber 15 into annular clearance S2 through acylindrical passage 24 formed between the outer peripheral surface ofpump shaft 6 and the inner peripheral surface ofsmall diameter portion 10 c oftubular section 10, it flows into the clearance S through through-holes 16 and then moves through a clearance betweencover member 17 andpulley 4 to be discharged out from annular clearances S1, S3. - As discussed above, almost whole coolant which leaks through
mechanical seal 8 to be flown into smalldiameter shaft section 21 through outerperipheral surface 6 c ofpump shaft 6 can be effectively cut and splash so as to drop intodrain chamber 12 throughdrain hole 11, thereby sufficiently preventing coolant leaking throughmechanical seal 8 from flowing intoball bearing 5. Furthermore, even if a small amount of coolant flows through the outer peripheral surface of smalldiameter shaft section 21 ofpump shaft 6 to the side offront end section 6 a ofpump shaft 6, it can be effectively cut by and splash from outer periphery of secondannular face 23 so as to be drop intodrain chamber 12 throughdrain hole 11 thereby sufficiently preventing it from penetration intoball bearing 5. Moreover, water vapor discussed above is also smoothly discharged out of water pump 1 through vent opening 14, annular clearance S2, through-holes 16 and clearances S, S1, S3 thereby preventing it from penetration intoball bearing 5. Additionally, the inside ofball bearing 5 is sealed with bearingseals ball bearing 5. - Further, cover 17 can prevent penetration of dusts and the like into
ball bearing 5 through through-holes 16 from the outside. Besides, under the action ofshield plate 20, penetration of dusts and the like intoball bearing 5 through the outside around theintermediate portion 10 b of cylindrical section 19 can be prevented. - As a result, formation of rust inside
ball bearing 5 can be effectively prevented while avoiding penetration of dusts and the like into theball bearing 5, thus improving the durability ofball bearing 5. - Furthermore, the outer peripheral surface of small
diameter shaft section 21 of the pump shaft is formed simply cylindrical, and therefore the small diameter shaft section can be readily formed by machining such as cutting or grinding. - Hereinafter, discussion will be made on a variety of further embodiments including respectively modified examples of configurations each of which is around small
diameter shaft section 21 ofpump shaft 6, with reference toFIGS. 3 to 9 in which the same reference numerals as those in the first embodiment designate like parts and elements. -
FIG. 3 illustrates an essential part of a second embodiment of the water pump according to the present invention, in which smalldiameter shaft section 21 ofpump shaft 6 is extended to the tip end offront end section 6 a so that the diameter of the front end section is equal to that of the small diameter shaft section. Accordingly, only firstannular face 22 exists so that no second annular face (23) exists; however, coolant or water flowing through outerperipheral surface 6 c ofpump shaft 6 can be effectively cut and splash under the action of firstannular face 22. -
FIG. 4 illustrates an essential part of a third embodiment of the water pump according to the present invention, in whichsmall diameter section 21 ofpump shaft 6 is extended to the tip end offront end section 6 a similarly to in the second embodiment. Firstannular face 22 is frustoconical and tapered in a direction toward the mechanical seal so that an inner periphery (no numeral) of firstannular face 22 is axially withdrawn in a direction towardmechanical seal 8 relative toouter periphery 22 a. Thus, an outer peripheral portion (includingouter periphery 22 a) of the annular step portion is formed having an acute angle in section. Accordingly, with this embodiment, coolant or water flowing through outerperipheral surface 22 a in a direction of from the side ofmechanical seal 8 to smalldiameter shaft section 21 is securely cut and splash under the action of the sharp edge-like outer peripheral portion. As a result, a water cutting and splashing effect can be further improved thereby sufficiently preventing water from transferring to smalldiameter shaft section 21. -
FIG. 5 illustrates an essential part of a fourth embodiment of the water pump according to the present invention, in which firstannular face 22 is frustoconical and tapered in a direction toward the mechanical seal so that an outer peripheral portion (includingouter periphery 22 a) of the annular step portion is formed having an acute angle in section, similarly to in the third embodiment. Secondannular face 23 is formed perpendicular to the axis ofpump shaft 6. - Accordingly, the similar effect as in the third embodiment can be obtained by the first
annular face 22. Additionally, even if a small amount of coolant or water is transferred through the outer peripheral surface ofsmall diameter section 21, it can be cut and splash by secondannular face 23. -
FIG. 6 is an essential part of a fifth embodiment of the water pump according to the present invention, in which firstannular face 22 is formed perpendicular to the axis ofpump shaft 6 similarly to in the first and second embodiments whereas the secondannular face 23 is formed frustoconical and tapered in a direction toward themechanical seal 8 so that the inner periphery of secondannular face 23 is axially withdrawn in a direction toward the mechanical seal relative toouter periphery 23 a. - With this embodiment, effective water cutting and splashing actions can be obtained by first
annular face 23. Furthermore, since secondannular face 23 is formed tapered in the direction toward the mechanical seal, water cutting and splashing actions are reduced; however, the rigidity ofpump shaft 6 is increased thereby suppressing development of a concentrated stress in a direction of bending. -
FIG. 7 illustrates an essential part of a sixth embodiment of the water pump according to the present invention, which is basically similar to the first embodiment with the exception that the outerperipheral surface 6 c ofpump shaft 6 is formed gently tapered in a direction of from the side offront end section 6 a to the side ofrear end section 6 b. Accordingly, an outer peripheral portion (includingouter periphery 22 a) of the annular step portion is naturally formed having a large acute angle in section, whereas an outer peripheral portion (including anouter periphery 23 a) of the other annular step portion is naturally formed having a small obtuse angle in section. - Hence, a good water cutting and splashing effect can be obtained particularly by the outer peripheral portion (including
outer periphery 22 a) of the annular step portion including firstannular face 22. -
FIG. 8 illustrates an essential part of a seventh embodiment of the water pump according to the present invention, in which firstannular face 22 includes coaxial two annular faces (no numerals) which are different in diameter and axially separate from each other so that the two annular faces are connected through a cylindrical outer peripheral surface which is smaller in diameter than outerperipheral surface 6 c ofpump shaft 6 thereby to form first two annular step portions, while firstannular face 23 includes coaxial two annular faces (no numerals) which are different in diameter and axially separate from each other so that the two annular faces are connected through a cylindrical outer peripheral surface which is smaller in diameter than outerperipheral surface 6 c ofpump shaft 6 thereby to form second two annular step portions, in which first and second annular faces 22, 23 are generally symmetrical to each other. Thus, the first two annular step portions respectively includingouter peripheries annular face 22, while the second two annular step portions respectively includingouter peripheries annular face 22. - Accordingly, an effective water cutting and splashing effect can be obtained by the two annular step portions (respectively including
outer peripheries outer peripheries -
FIG. 9 illustrates an essential part of a fifth embodiment of the water pump according to the present invention, which is basically similar to the first embodiment with the exception that smalldiameter shaft section 21 ofpump shaft 6 is integrally provided with a coaxialannular projection section 25 which is located at its axially central part and has an outer diameter equal to that ofpump shaft 6.Annular projection section 25 projects radially outward from the outer peripheral surface of smalldiameter shaft section 21 and has opposite annular faces 25 a, 25 b which are perpendicular to the axis ofpump shaft 6. In this embodiment, first and second annular faces 22, 23 are perpendicular to the axis ofpump shaft 6 similarly toannular faces - Accordingly, the almost whole water flown upon being transferred through outer
peripheral surface 6 c ofpump shaft 6 is first cut and splash byouter periphery 22 a of firstannular face 22. Even if a part of such water flows in a direction ofannular projection section 25 through the outer peripheral surface of smalldiameter shaft section 21, it is further cut and splashes byouter periphery 25 c ofannular face 25 a ofannular projection section 25 so as to drop in a direction ofdrain hole 11. Hence, under such double water cutting and splashing actions, water hardly flows in a direction of secondannular face 23 overannular face 25 a. Even if a part of water flows in the direction of secondannular face 23, water can be cut and splash byouter periphery 25 d ofannular face 25 b of theannular projection section 25 and byouter periphery 23 a of secondannular face 23 so as to be prevented from flowing in a direction towardball bearing 5. Additionally, by virtue ofannular projection section 25, smalldiameter shaft section 21 ofpump shaft 6 is increased in its strength thereby making it possible to be sufficiently endurable to bending deformation and torsional deformation. - The present invention is not limited to the above embodiments, in which, for example, the axial length W of small
diameter shaft section 21 and the radial width D of first or secondannular face annular face ball bearing 5 has been shown and described to be used as a bearing forpulley 4, it will be appreciated that it may be replaced with, for example, a plane bearing or a needle bearing. Further, although firstannular face 22 has been shown and described as being formed perpendicular to the axis ofpump shaft 6 in the first embodiment or the like, it will be understood that the first annular face may be formed slightly tapered in a direction towardmechanical seal 8 or in a direction towardball bearing 5 forming a small angle (in section) to a plane perpendicular to the axis ofpump shaft 6. - Next, discussion will be made technical ideas (a) to (q) grasped from the above embodiments, other than those recited in claims.
- A basic idea of the present invention resides in a water pump comprising: a pulley including a cylindrical section located radially inward of an outer periphery of the pulley, the pulley being rotatable upon transmission of power from a driving force; a pump shaft disposed radially inward of the cylindrical section of the pulley and fixed to the cylindrical section, the pump shaft having a first end section on which the pulley is mounted; a first flange wall extending from a first axial end portion of the cylindrical section of the pulley in a direction of the pump shaft; an impeller disposed at a second end section of the pump shaft; a pump housing including a tubular section disposed to surround the pump shaft; a mechanical seal disposed between a radially inward side of the tubular section of the pump housing and an outer peripheral surface of the pump shaft; and a bearing disposed between an inner peripheral surface of the cylindrical section of the pulley and the tubular section of the pump housing to rotatably support the pulley on the tubular section of the pump housing; wherein the pump shaft includes a coaxial small diameter shaft section located at its first part which is located axially between the mechanical seal and the flange wall, the small diameter shaft section having a diameter smaller than a diameter of a second part of the pump shaft on which the mechanical seal is disposed, the small diameter shaft section having an outer peripheral surface located radially inward of an outer peripheral surface of a third part of the pump shaft axially extending from the second part so as to form a first annular step portion.
- (a) In the water pump as recited in the basic idea, the outer peripheral surface of the small diameter shaft section of the pump shaft is cylindrical.
- With this idea, since the outer peripheral surface of the small diameter shaft section is simply cylindrical, the small diameter shaft section can be readily formed by cutting or grinding.
- (b) In the water pump as recited in the basic idea, the small diameter shaft section of the pump shaft is formed at a part of the pump shaft. The diameter of the small diameter shaft section is smaller than a diameter of a fourth part of the pump shaft extending to the first end section of the pump shaft. The outer peripheral surface of the small diameter shaft section is located radially inward of an outer peripheral surface of the fourth part of the pump shaft so as to form a second annular step portion.
- With this idea, even if water is transferred through the outer peripheral surface of the small diameter shaft section so as to move to the side of the flange wall, water can be cut and splash by the periphery of an annular face forming the second step portion, thereby effectively restricting movement of water in a direction toward the flange wall, i.e., in a direction toward the bearing.
- (c) In the water pump as recited at (b5), the outer peripheral surface of the fourth part of the pump shaft and the outer peripheral surface of the small diameter shaft section are connected to each other through at least one annular face which is perpendicular to an axis of the pump shaft or tapered in a direction away from the first flange wall.
- With this idea, since the second annular step portion is formed tapered, the strength of the pump shaft is increased.
- (d) In the water pump as recited in the basic idea, the tubular section of the pump housing includes a first portion defining thereinside a drain chamber for storing a liquid having a volume, and a second portion defining a drain hole for introducing liquid dropped from the annular step portion into the drain chamber. The drain chamber and the drain hole are located under the annular step portion in a direction of gravity. The drain chamber is open to the atmosphere.
- With this idea, liquid stored in the drain chamber is evaporated to release to the atmosphere.
- (e) In the water pump as recited at (d), the tubular section of the pump housing includes a third portion defining thereinside an annular space chamber located around the outer peripheral surface of the small diameter shaft section, and a fourth portion defining a vent opening for venting vapor. The drain hole is formed above the annular space chamber in the direction of gravity, while the vent opening is formed below the annular space chamber in the direction of gravity.
- (f) In the water pump as recited in the basic idea, the pump shaft is formed continuously tapered in an axial direction of from the side of the flange wall to the side of the impeller. The outer peripheral surface of the third part of the pump shaft and the outer peripheral surface of the small diameter shaft section are connected through at least one annular face forming the first annular step portion, the annular face being perpendicular to the axis of the pump shaft.
- With this idea, water transferred through the tapered outer peripheral surface of the pump shaft from the side of the mechanical seal can be effectively cut and splash by a peripheral portion having an acute angle, formed by the tapered outer peripheral surface and the annular face.
- (g) In the water pump as recited in the basic idea, the pulley includes a second flange wall extending from the cylindrical section at a second axial end portion opposite to the first axial end portion, and a belt installation section which axially extends from the outer peripheral portion of the second flange wall.
- (h) In the water pump as recited in the basic idea, the pulley and the first flange wall are formed integral with each other.
- (i) In the water pump as recited at (h), the pump shaft and the first flange wall are formed separate from each other, in which the first end section of the pump shaft is fixed to the first flange wall.
- (j) In the water pump as recited in the basic idea, the first flange wall is formed with a plurality of through-holes.
- With this idea, by using these through-holes, the bearing can be fixed between the cylindrical section of the pulley and the tubular section of the pump housing from an axial direction with a jig, and water vapor passed through the mechanical seal can be discharged to the outside.
- (k) In the water pump as recited in the basic idea, the first annular step portion is formed to have a plurality of annular step portions.
- (l) In the water pump as recited at (k), the small diameter shaft section includes a plurality of coaxial small diameter shaft sections so as to form a plurality of annular step portions.
- (m) In the water pump as recited in the basic idea, the bearing includes an inner race, an outer race, and a bearing seal which is fixed to one of the inner and outer races and slidable to the other race.
- By virtue of this bearing seal, water and the like can be prevented from penetrating to the inside of the bearing.
- (n) In the water pump as recited in the basic idea, the outer peripheral surface of the small diameter shaft section is located radially inward of the outer peripheral surface of the third part of the pump shaft by not less than 1 mm which corresponds to a height of the annular step portion.
- (o) A water pump comprising: a pulley including a cylindrical section located radially inward of an outer periphery of the pulley, the pulley being rotatable upon transmission of power from a driving force; a pump shaft disposed radially inward of the cylindrical section of the pulley and fixed to the cylindrical section, the pump shaft having a first end section on which the pulley is mounted; a flange wall extending from an axial end portion of the cylindrical section of the pulley in a direction of the pump shaft; an impeller disposed at a second end section of the pump shaft; a pump housing including a tubular section disposed to surround the pump shaft; a mechanical seal disposed between a radially inward side of the tubular section of the pump housing and an outer peripheral surface of the pump shaft; and a bearing disposed between an inner peripheral surface of the cylindrical section of the pulley and the tubular section of the pump housing to rotatably support the pulley on the tubular section of the pump housing; wherein the pump shaft includes a step portion located axially between the mechanical seal and the flange wall to restrict movement of adhering water transferred through the outer peripheral surface of the pump shaft from the side of the mechanical seal in a direction toward the flange wall.
- (p) A water pump comprising: a pump shaft having a first end section on which a pulley is disposed and a second end section on which an impeller is disposed; a pump housing disposed surrounding an outer peripheral side of the pump shaft; a bearing disposed to the pump housing to rotatably supporting the pump shaft; and a mechanical seal fixed to the pump housing and to the pump shaft and having a seal section which makes sliding at a position nearer to the impeller than to the bearing in an axial direction of the pump shaft; wherein a coaxial and annular groove is formed at the outer peripheral surface of the pump shaft and located at an axial position between the mechanical seal and the bearing thereby to prevent adhering water from transferring in a direction toward the bearing.
- (q) The water pump as recited at (p), the annular groove has an axial width of not less than 2 mm.
- The entire contents of Japanese Patent Applications P2010-263386, filed Nov. 26, 2010, are incorporated herein by reference.
- Although the invention has been described above by reference to certain embodiments and examples of the invention, the invention is not limited to the embodiments and examples described above. Modifications and variations of the embodiments and examples described above will occur to those skilled in the art, in light of the above teachings. The scope of the invention is defined with reference to the following claims.
Claims (20)
1. A water pump comprising:
a pulley including a cylindrical section located radially inward of an outer periphery of the pulley, the pulley being rotatable upon transmission of power from a driving force;
a pump shaft disposed radially inward of the cylindrical section of the pulley and fixed to the cylindrical section, the pump shaft having a first end section on which the pulley is mounted;
a first flange wall extending from a first axial end portion of the cylindrical section of the pulley in a direction of the pump shaft;
an impeller disposed at a second end section of the pump shaft;
a pump housing including a tubular section disposed to surround the pump shaft;
a mechanical seal disposed between a radially inward side of the tubular section of the pump housing and an outer peripheral surface of the pump shaft; and
a bearing disposed between an inner peripheral surface of the cylindrical section of the pulley and the tubular section of the pump housing to rotatably support the pulley on the tubular section of the pump housing;
wherein the pump shaft includes a coaxial small diameter shaft section located at its first part which is located axially between the mechanical seal and the flange wall, the small diameter shaft section having a diameter smaller than a diameter of a second part of the pump shaft on which the mechanical seal is disposed, the small diameter shaft section having an outer peripheral surface located radially inward of an outer peripheral surface of a third part of the pump shaft axially extending from the second part so as to form a first annular step portion.
2. A water pump as claimed in claim 1 , wherein the outer peripheral surface of the third part of the pump shaft and the outer peripheral surface of the small diameter shaft section are connected to each other through at least one annular face which is perpendicular to an axis of the pump shaft or tapered in a direction approaching the mechanical seal.
3. A water pump as claimed in claim 1 , wherein the tubular section of the pump housing includes a first portion defining thereinside a drain chamber for storing a liquid having a volume, and a second portion defining a drain hole for introducing liquid dropped from the annular step portion into the drain chamber, the drain chamber and the drain hole being located under the first annular step portion in a direction of gravity.
4. A water pump as claimed in claim 1 , wherein the outer peripheral surface of the small diameter shaft section of the pump shaft is cylindrical.
5. A water pump as claimed in claim 1 , wherein the small diameter shaft section of the pump shaft is formed at a part of the pump shaft, the diameter of the small diameter shaft section being smaller than a diameter of a fourth part of the pump shaft extending to the first end section of the pump shaft, the outer peripheral surface of the small diameter shaft section being located radially inward of an outer peripheral surface of the fourth part of the pump shaft so as to form a second annular step portion.
6. A water pump as claimed in claim 5 , wherein the outer peripheral surface of the fourth part of the pump shaft and the outer peripheral surface of the small diameter shaft section are connected to each other through at least one annular face which is perpendicular to an axis of the pump shaft or tapered in a direction away from the first flange wall.
7. A water pump as claimed in claim 3 , wherein the drain chamber is open to the atmosphere.
8. A water pump as claimed in claim 7 , wherein the tubular section of the pump housing includes a third portion defining thereinside an annular space chamber located around the outer peripheral surface of the small diameter shaft section, and a fourth portion defining a vent opening for venting vapor, the drain hole being formed above the annular space chamber in the direction of gravity, the vent opening being formed below the annular space chamber in the direction of gravity.
9. A water pump as claimed in claim 1 , wherein the pump shaft is formed continuously tapered in an axial direction of from side of the flange wall to side of the impeller, the outer peripheral surface of the third part of the pump shaft and the outer peripheral surface of the small diameter shaft section being connected through at least one annular face forming the first annular step portion, the annular face being perpendicular to the axis of the pump shaft.
10. A water pump as claimed in claim 1 , wherein the pulley includes a second flange wall extending from the cylindrical section at a second axial end portion opposite to the first axial end portion, and a belt installation section which axially extends from an outer peripheral portion of the second flange wall.
11. A water pump as claimed in claim 1 , wherein the pulley and the first flange wall are formed integral with each other.
12. A water pump as claimed in claim 11 , wherein the pump shaft and the first flange wall are formed separate from each other, the first end section of the pump shaft being fixed to the first flange wall.
13. A water pump as claimed in claim 1 , wherein the first flange wall is formed with a plurality of through-holes.
14. A water pump as claimed in claim 1 , wherein the first annular step portion is formed to have a plurality of annular step portions.
15. A water pump as claimed in claim 14 , wherein the small diameter shaft section includes a plurality of coaxial small diameter shaft sections so as to form a plurality of annular step portions.
16. A water pump as claimed in claim 1 , wherein the bearing includes an inner race, an outer race, and a bearing seal which is fixed to one of the inner and outer races and slidable to the other race.
17. A water pump as claimed in claim 1 , wherein the outer peripheral surface of the small diameter shaft section is located radially inward of the outer peripheral surface of the third part of the pump shaft by not less than 1 mm which corresponds to a height of the annular step portion.
18. A water pump comprising:
a pulley including a cylindrical section located radially inward of an outer periphery of the pulley, the pulley being rotatable upon transmission of power from a driving force;
a pump shaft disposed radially inward of the cylindrical section of the pulley and fixed to the cylindrical section, the pump shaft having a first end section on which the pulley is mounted;
a flange wall extending from an axial end portion of the cylindrical section of the pulley in a direction of the pump shaft;
an impeller disposed at a second end section of the pump shaft;
a pump housing including a tubular section disposed to surround the pump shaft;
a mechanical seal disposed between a radially inward side of the tubular section of the pump housing and an outer peripheral surface of the pump shaft; and
a bearing disposed between an inner peripheral surface of the cylindrical section of the pulley and the tubular section of the pump housing to rotatably support the pulley on the tubular section of the pump housing;
wherein the pump shaft includes a step portion located axially between the mechanical seal and the flange wall to restrict movement of adhering water transferred through the outer peripheral surface of the pump shaft from side of the mechanical seal in a direction toward the flange wall.
19. A water pump comprising:
a pump shaft having a first end section on which a pulley is disposed and a second end section on which an impeller is disposed;
a pump housing disposed surrounding an outer peripheral side of the pump shaft;
a bearing disposed to the pump housing to rotatably supporting the pump shaft; and
a mechanical seal fixed to the pump housing and to the pump shaft and having a seal section which makes sliding at a position nearer to the impeller than to the bearing in an axial direction of the pump shaft;
wherein a coaxial and annular groove is formed at the outer peripheral surface of the pump shaft and located at an axial position between the mechanical seal and the bearing to prevent adhering water from transferring in a direction toward the bearing.
20. A water pump as claimed in claim 19 , wherein the annular groove has an axial width of not less than 2 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-263386 | 2010-11-26 | ||
JP2010263386A JP5197722B2 (en) | 2010-11-26 | 2010-11-26 | Water pump |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120134789A1 true US20120134789A1 (en) | 2012-05-31 |
Family
ID=46049991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/253,579 Abandoned US20120134789A1 (en) | 2010-11-26 | 2011-10-05 | Water Pump |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120134789A1 (en) |
JP (1) | JP5197722B2 (en) |
CN (1) | CN102478015A (en) |
DE (1) | DE102011117897A1 (en) |
Cited By (7)
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US20140064931A1 (en) * | 2012-08-29 | 2014-03-06 | Hitachi Automotive Systems, Ltd. | Water pump |
US20180156219A1 (en) * | 2015-07-23 | 2018-06-07 | Eagle Industry Co., Ltd. | Shaft-sealing device and submersible pump |
US10240617B2 (en) * | 2015-07-01 | 2019-03-26 | Schaeffler Technologies AG & Co. KG | Water pump bearing with active condensate purging system |
US20190242395A1 (en) * | 2018-02-05 | 2019-08-08 | Bestway Inflatables & Material Corp. | Pumps with a waterproof structure |
US10968810B2 (en) * | 2016-06-27 | 2021-04-06 | Schaeffler Technologies AG & Co. KG | Thermal management module |
AU2019391769B2 (en) * | 2018-12-04 | 2023-02-02 | Gates Corporation | Axial flux motor water pump |
US20230243363A1 (en) * | 2022-02-02 | 2023-08-03 | Mahle International Gmbh | Delivery device for delivering a liquid |
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WO2015098293A1 (en) * | 2013-12-27 | 2015-07-02 | 日立オートモティブシステムズ株式会社 | Water pump and method for producing water pump |
JP6266388B2 (en) * | 2014-03-12 | 2018-01-24 | 日立オートモティブシステムズ株式会社 | Water pump |
CN104373370A (en) * | 2014-09-11 | 2015-02-25 | 河南飞龙(芜湖)汽车零部件有限公司 | Compact water pump |
CN104824749B (en) * | 2015-05-05 | 2017-01-18 | 德御坊创新食品(北京)有限公司 | Black soya bean and dark plum drink and preparation method thereof |
JP2020133539A (en) * | 2019-02-21 | 2020-08-31 | 株式会社久保田鉄工所 | Electric water pump |
DE102022001410A1 (en) | 2022-04-25 | 2023-10-26 | Mercedes-Benz Group AG | Mechanical pump for a motor vehicle |
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US9611858B2 (en) * | 2012-08-29 | 2017-04-04 | Hitachi Automotive Systems, Ltd. | Water pump with reinforcement rib |
US10240617B2 (en) * | 2015-07-01 | 2019-03-26 | Schaeffler Technologies AG & Co. KG | Water pump bearing with active condensate purging system |
US20180156219A1 (en) * | 2015-07-23 | 2018-06-07 | Eagle Industry Co., Ltd. | Shaft-sealing device and submersible pump |
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Also Published As
Publication number | Publication date |
---|---|
JP5197722B2 (en) | 2013-05-15 |
DE102011117897A1 (en) | 2012-05-31 |
CN102478015A (en) | 2012-05-30 |
JP2012112340A (en) | 2012-06-14 |
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Legal Events
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AS | Assignment |
Owner name: HITACHI AUTOMOTIVE SYSTEMS, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MURAKAMI, SHINGO;ONIGATA, JUNICHIRO;REEL/FRAME:027240/0790 Effective date: 20110913 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |