CN1702331A - Water pump - Google Patents

Abstract

The invention relates to a water pump comprising a belt pulley which receives a torque rotation coming from a drive source and is provided with a shaft part extending along the shaft core from the center, an impeller which is fixed to the shaft part and rotates together with the shaft part, a body which forms a water chamber positioned together with the impeller, a cylinder part extending out of the body in terms of a cylinder, a bearing which can rotatablely support the pulley at the cylinder part, and a shaft sealing element which separates the bearing from the water chamber through sealing. The invention is characterized in that the shaft sealing element and the bearing are at least partially configured to be overlapped with each other and the shaft part is integrated with the pulley into a whole through a metal sheet so as to enable the shaft part to rotate.

Description

Water pump

Technical field

The present invention relates to a kind of circuit water pump that is used for the freezing mixture of internal-combustion engine.

Background technique

A kind of water pump is disclosed in Japanese Patent Laid Open Publication NO.262096/1992, the one columnar supporting part around a rotatingshaft is arranged in the pump case of this water pump, the outer end of this rotatingshaft is protruding from this supporting part, fuses with the cylindrical shape belt pulley that centers on this supporting part.One bearing is arranged between the outer surface of the internal surface of this belt pulley and this supporting part, and a Sealing and bearing arranged concentric are only arranged, and is arranged between the internal surface and this rotatingshaft of this supporting part.

As shown in figure 12, disclosed water pump has the lip-deep supporting part of connection or the main body 2A of the cylinder block that is fixed to internal-combustion engine in Japanese Patent Laid Open Publication NO.262096/1992, one belt pulley part 40A by the transfer member driving, one is connected to the solid shaft portion 50A in the center portion of belt pulley part 40A coaxially, one makes the bearing 6A that belt pulley part 40A rotates with respect to main body 2A and installs and fixes rotary blade part 8A on this shaft portion 50A between main body 2A and belt pulley part 40A.When the bent axle of internal-combustion engine is driven, hang over the last belt 49A that constitutes transfer member of bent axle and belt pulley part 40A and be driven to rotate, and then drive pulley part 40A rotates.When belt pulley part 40A rotated, the shaft portion 50A that is connected on the belt pulley part 40A also rotated with identical direction, and then the indoor rotary blade part 8A of unipump is also together rotated, and historical facts or anecdotes has showed pumping operation.

And, according to Japanese Patent Laid Open Publication NO.149822/1990, it discloses water pump, in this water pump, one belt pulley is set to the bearings part around pump case, and a tap hole is formed on the bottom of a buffer cell, and this buffer cell is formed on the bearing that a Sealing is provided with part and bearings part and is provided with between the part, this tap hole leads to the internal surface of belt pulley, forms a water storage part at the internal surface place of belt pulley.

Simultaneously, according to the water pump of the prior art, when the freezing mixture that leaks from shaft seal (mechanical seal) was invaded bearing, just expose such shortcoming: promptly, bearing was etched, and slip resistance increase or bearing are damaged.

Therefore, according to the water pump of prior art,, except shaft seal, between the internal surface of housings support part and rotatingshaft, a plurality of Sealings are set in order to prevent to invade bearing from the freezing mixture that shaft seal leaks.Yet, structure although it is so can prevent freezing mixture intrusion bearing, but a problem has also appearred, promptly, the quantity of the parts that link to each other with housing has increased, and it is very complicated that the shape of parts and manufacturing become, and owing to not only need shaft seal, also need above-mentioned Sealing, so the cost of parts has also improved.

And, according to water pump shown in Figure 12, the solid shaft portion and the belt pulley that stretch out to the pump chamber side partly are separated from one another, when water pump is combined, the belt pulley part is connected in proper order with solid shaft portion, is being unsafty aspect lightweight water pump of formation and the combination property therefore.

In addition, in prior art water pump (as Japanese Patent Laid Open Publication NO.149822/1990), the liquid that partly leaks from the water storage of the internal surface that is formed on belt pulley arrives the external peripheral surface as the belt pulley of the belt land surface of belt pulley.As everyone knows, the transmission of the rotatory force of belt pulley realizes by means of the friction between belt and the belt pulley by rotatingshaft, and belt constitutes the rotatory force conveying means, therefore when liquid adheres on the belt land surface of belt pulley, can cause friction to reduce, cause that rotatory force transmits loss.And belt is generally made by rubber, therefore has belt because of having adhered to the problem that liquid is heaved, and its intensity has also reduced.

Summary of the invention

Therefore, the purpose of this invention is to provide a kind of can preventing and invade water pump bearing, that size is little, in light weight and simple in structure from the freezing mixture that shaft seal leaks.

Except above-mentioned purpose, the technical problem that the present invention will solve provides the water pump that a kind of drawability and then help that can guarantee that the belt pulley with pulley partly forms the shaft portion of one shortens the length of shaft portion.

The technical problem that another will solve of the present invention provides a kind of can preventing and arrives belt land surface and size water pump little, in light weight and simple in structure from the liquid that shaft seal leaks.

According to an aspect of the present invention, provide a kind of water pump that addresses the above problem, this water pump comprises:

One belt pulley, this belt pulley is by accepting moment of torsion from driving source and rotate and having the shaft portion that extends along an axis direction of heart position therein;

One impeller that is fixed on the described shaft portion and together rotates with described shaft portion;

One main body, the hydroecium that this main body formation one and impeller are arranged together;

One cylindrical portions may of stretching out with cylindrical shape from described main body;

One supports the bearing of described belt pulley rotationally in cylindrical portions may; With

One is used for described bearing and described hydroecium are sealed the shaft seal that separates;

It is characterized in that described shaft seal is fixed between the inner circumferential surface of the external peripheral surface of described cylindrical portions may and main body; Described axial region forms one by metal sheet and described belt pulley, so that the axial region rotation;

Described impeller comprises that one has the central boss part and the blade of end hollow shape, this has end hollow shape to have a closure wall, blade stretches out in the axial length direction of the described shaft portion in direction upper edge opposite with central boss, the central boss of described impeller partly is installed on the inside of axle hollow chamber of described shaft portion, and the axle hollow chamber of this shaft portion seals not circulation status by closure wall.

Best, shaft portion comprises a hollow chamber, and impeller comprises central boss part and blade, and this central boss partly is installed on the inside of axle hollow chamber of shaft portion.

The outer shroud of bearing is connected to the inner circumferential surface of a belt pulley, ring is connected on the external peripheral surface of cylindrical portions may in it, shaft seal is connected on the inner circumferential surface of cylindrical portions may, and in the shaft seal and the space between the bearing of belt pulley, belt pulley has the extension that reaches an outside along diametric(al).

According to most preferred embodiment of the present invention, the interior ring of bearing is connected on the external peripheral surface that is formed on the cylindrical portions may on the main body, shaft seal is connected on the inner circumferential surface of cylindrical portions may, therefore, the at least a portion that is usually placed in vertically the locational shaft seal that extends and bearing can arranged superposed, and then shortens the shaft portion length in the axial direction of water pump.Thus, the size of water pump is dwindled and its installation capability raising.

The pulley of using among the present invention has belt pulley part and partly forms the shaft portion of one with this belt pulley, this belt pulley part by one around transfer member as a belt drives.Shaft portion is positioned at the center portion of belt pulley part, and is through the extruding calendering, coaxial with it basically.Axial region is divided into the cylindrical shape of direction extension along the axial length, has the axle hollow chamber of direction extension along the axial length, and a front opening and that is arranged on the forward end of a hollow chamber is arranged on the cardinal extremity opening of the terminal side of a hollow chamber.In this way, shaft portion has the cylindrical shape of direction extension along the axial length, and is the hollow shape of the no end that does not have the underside wall part, therefore, compare with the situation that end hollow space is arranged, guaranteed the extruding drawability of the circumference wall of shaft portion admirably with underside wall part.

And, the central boss of rotary blade part partly is installed to the inside of axle hollow chamber of the shaft portion of pulley, thereby compare with the situation of outside that the central boss of rotary blade part partly is installed to the shaft portion of pulley, reduced the degree of stretching out that fore-end stretches out to the rotary blade part side on the axial length direction of shaft portion, therefore, such structure helps shortening the axial length of shaft portion, and, guaranteed the extruding drawability of shaft portion admirably because of this reason.

According to a most preferred embodiment of the present invention, the liquid that leaks from shaft seal falls into a part that is positioned at belt pulley and stretches out laterally on diametric(al).Thus, realized water cutting effect, can prevent that flowing to the liquid that causes on the belt land surface with the belt pulley of belt lacing by liquid adheres on the belt.

The extension of belt pulley can store the liquid of the amount (prearranging quatity) suitable with its volume.In this case, by controlling device, the level of stored liquid always can keep below the inner circumferential surface of belt land surface, therefore can prevent the inner circumferential surface of stored liquid intrusion belt land surface.

Description of drawings

Fig. 1 is the sectional view of first embodiment's of the present invention water pump;

Fig. 2 is the sectional view of second embodiment's of the present invention water pump;

Fig. 3 is the sectional view of major component of the 3rd embodiment's of the present invention water pump;

Fig. 4 is the sectional view of major component of the 4th embodiment's of the present invention water pump;

Fig. 5 is the sectional view of the 5th embodiment's of the present invention water pump;

Fig. 6 is the sectional view of the 6th embodiment's of the present invention water pump;

Fig. 7 is the sectional view of the 7th embodiment's of the present invention water pump;

Fig. 8 is the sectional view of the 8th embodiment's of the present invention water pump;

Fig. 9 is the front view of the 8th embodiment's of the present invention water pump;

Figure 10 is the sectional view of the 9th embodiment's of the present invention water pump;

Figure 11 is the front view of the 9th embodiment's of the present invention water pump; With

Figure 12 is the sectional view of a prior art water pump.

Embodiment

Fig. 1 is the sectional view of first embodiment's of the present invention water pump.

In Fig. 1, water pump 101 is made of a belt pulley 110, an impeller 130, a bearing 140, a shaft seal 150, a housing (main body) 160 and a Sealing 180.

Belt pulley 110 is made the cylinder cup-shaped, and at the center of bottom surface one shaft portion 120 is arranged, and this part is outstanding from drum on away from the direction of bottom surface.The outer periphery surface of shaft portion 120 and belt pulley 110 is provided with one heart.Belt pulley 110 is made through the steel plate of corrosion-resistant treatments as one by punching press one disk shaped part.Just, the belt pulley 110 with belt pulley spare and shaft portion 120 is made through punching press and/or extrusion process by a metal sheet.Shaft portion 120 is made hollow circle tube as shown in the figure.

Impeller 130 can be described as a kind of unshrouded impeller, has a foundation 130b and several blade 130c that stretches out from it.Formed groove part 130a is the center coupling shaft part 120 that is used at the foundation 130b of impeller 130.In this embodiment, couple together via press fit between groove part 130a and the shaft portion 120, can not rotate each other.

Housing 160 comprises a main body 162, and this main body 162 has one and sucks part, a transport portion, and a not shown in the drawings and groove part 161, one main body underside portion 164 are connected on the end face of main body 162.Main body 162 can be an aluminium mold product, also can be to make one with the cylinder block or the Timing Belt housing (timing belt case) of motor.

Main body underside portion 164 is made disc-shape substantially, diameter less than the cylindrical portions may 163 of the outer diameter of main body 162 on away from the direction of main body 162 near stretching out at its center.Main body underside portion 164 is made through the steel plate of corrosion-resistant treatments as one by punching press one disk shaped part.Main body 162 and main body underside portion 164 are connected by bolt via Sealing 180, and be not shown in the drawings.Thus, formed the space of the groove part and the maintenance water-stop between the main body underside portion 164 of main body 162.

Above-mentioned space has constituted a hydroecium 170, and impeller 130 is positioned at this hydroecium 170.

The inner circumferential surface 163a of the cylindrical portions may 163 of main body underside portion 164 links to each other with the external peripheral surface 150b of shaft seal 150, passes through press fit between the two, can not relatively rotate each other.And the external peripheral surface of shaft portion 120 links to each other with the inner circumferential surface 150a of shaft seal 150, equally also is to connect through press fit.Here, though do not illustrate in the drawings, inside and outside circumferential surface 150a and 150b are relatively turnable each other.Shaft portion 120 is supported by shaft seal 150 with respect to housing 160 rotationally.Here, shaft seal 150 is the mechanical seal known to a kind of public.

And the external peripheral surface 163b of the cylindrical portions may 163 of main body underside portion 164 links to each other via ring 140a in the press fit and, can not relatively rotate each other.Simultaneously, the inner circumferential surface of belt pulley 110 can not link to each other via press fit each other with the outer shroud 140b of bearing 140 with relatively rotating.Here, bearing 140 is a kind of known rolling bearings.

Thus, belt pulley 110 is supported by housing 160 by bearing 140, and both are rotatable toward each other.

The position of shaft seal 150 and bearing 140, on axle direction, each part part overlaid at least.

First embodiment's of various details working condition.

Belt pulley 110 is driven by the rotatory force from the output shaft of motor, and is not shown in the drawings, through the belt of the external peripheral surface that is stretched over belt pulley 110, not shown in the figures.Along with the rotation of belt pulley 110, the shaft portion 120 that forms one with belt pulley 110 also rotates with identical direction.And, with the also rotation in the hydroecium 170 of housing 160 of impeller 130 of shaft portion 120 one.

Now, freezing mixture is filled in the hydroecium 170, and therefore, by the centrifugal force that rotation produced by impeller 130, the freezing mixture at the center of close hydroecium 170 is carried by impeller 130 on the excircle direction of impeller 130.In this way, carry out center from impeller 130 by centrifugal force to its outside pumping.Thus, in hydroecium 170, produce pressure difference between the center of rotation of close impeller 130 and its outer periphery, freezing mixture sucks from the suction port that a unshowned center of rotation near impeller 130 enters water pump 101.

And the pumping by impeller 130, freezing mixture is pressed into outer circumference portion, and is transported to the each several part of the motor that needs cooling by a unshowned delivery port that is positioned at outer circumference portion.

In view of being full of freezing mixture in the hydroecium 170, belt pulley 110 communicates with atmosphere by a plurality of hole 110a.But sealed 180 in the gap between main body 162 and the main body underside portion 164 seals airtightly, and shaft portion 120 seals by shaft seal 150 is set airtightly.

As mentioned above, first embodiment according to the invention, bearing 140 and shaft seal 150 are connected on the same parts, i.e. the external peripheral surface 163b of the cylindrical portions may 163 of main body underside portion 164 and inner circumferential surface 163a.Thus, can be arranged in same position at bearing 140 and the shaft seal 150 of aiming at layout on the axle direction at least in part on axle direction usually, promptly two parts can overlap each other in the axial direction.Therefore, shorten water pump 101 length in the axial direction, and then improved the installation capability of water pump 1 on motor.

(second embodiment)

Fig. 2 is the sectional view of second embodiment's of the present invention water pump 201.Fig. 2 only is that with the different of Fig. 1 the partial shape of shaft portion 220 and main body underside portion 264 is different, other identical with first embodiment, therefore with respect to the reference character among Fig. 1, adopting increases by 200 reference character, and the description of having omitted the part identical with first embodiment.

In Fig. 2, on the end face 220a of shaft portion 220, provide a through hole 220b.Through hole 220b is used to connect impeller 230 and shaft portion 220, via press fit, can not rotate toward each other, is used for axially impeller 230 being positioned.When a blade 230c of impeller 230 and the gap between the housing 260 were very big, the pumping capacity of impeller 230 can reduce, and when this gap is very little, impeller 230 might takes place again collide with housing 260.Therefore, the link position of impeller 230 and shaft portion 220 needs high degree of accuracy in the axial direction.

Yet by provide through hole 220b on the end face 220a of shaft portion 220, impeller 230 and shaft portion 220 can be connected, and measure its position by inserting anchor clamps, so impeller 230 can accurately connected on its position on the axle direction.

Simultaneously, the distance between belt pulley 210 and the impeller 230 is determined by the length of the shaft portion 220 that connects two parts in the axial direction.Therefore, shaft portion 220 needs certain length.Yet, when by a disk shaped part when punching press forms an elongated hollow shape, can go up in the part (corresponding to the end face 220a of shaft portion 220) of the bottom that constitutes this elongate hollow shape and form fold or crackle.Therefore, through hole 220b is set, can prevents to form fold or crackle by end face 220a at shaft portion 220, thus the formability energy when improving belt pulley 210 and making.

And, on the side end face of the cylindrical portions may 263 of the main body underside portion 264 of belt pulley 210 sides, be provided with the flange portion 265 that an one is shaped, this flange portion 265 is by amounting to bending on the direction of its diameter and form dwindling, make on the whole circumference of cylindrical portions may, dwindle its diameter greater than the external peripheral surface 250b of shaft seal 250.Formed the space 266 of a flute profile by the inner circumferential surface 263a of flange portion 265, shaft seal 250 and cylindrical portions may 263.Channel 266 work are as follows.Very little freezing mixture leaks and can produce in shaft sealing part 250, and this is its feature.

Yet the freezing mixture that leaks from shaft seal 250 temporarily is stored in the channel 266 that inner circumferential surface 263a and flange portion 265 by shaft seal 250, cylindrical portions may 263 form.The amount of the freezing mixture that leaks from shaft seal 250 is seldom, so freezing mixture can overflow and arrives zone near bearing 240 hardly from channel 266.

And the freezing mixture that is stored in the leakage in the channel 266 rotates the frictional heat evaporation that is produced by bearing 240, be discharged to the outside from the hole 210a that is formed on belt pulley 210, and the freezing mixture that leaks can not arrive near the bearing 240.

As mentioned above, according to second embodiment of the present invention, end face 220a place by shaft portion 220 is provided with through hole 220b, can improve the degree of accuracy of axial link position when impeller 230 is connected on the shaft portion 220, and has improved the formability of shaft portion 220 and belt pulley 210.

And, form flange portion 265 by the end face of amounting to bending cylinder part 263 on the direction of dwindling its diameter in belt pulley 210 sides, make on the whole circumference of cylindrical portions may, dwindle its diameter greater than the external peripheral surface 250b of shaft seal 250, be provided with channel 266, this space can temporarily store the freezing mixture that leaks from shaft seal 250, and near the freezing mixture intrusion bearing 240 that prevents to leak.

(the 3rd embodiment)

Fig. 3 is the sectional view of major component of the 3rd embodiment's of the present invention water pump 301.The different piece of Fig. 3 and Fig. 1 is the shape of main body underside portion 364, other part is identical with first embodiment, therefore reference character is different from reference character among Fig. 1 adding 300 beginnings, and the description of having omitted the part identical with first embodiment.

Among Fig. 3, end in the cylindrical portions may 363 of the main body underside portion 364 of belt pulley 310 sides, be provided with the flange portion 365 that an one is shaped, this flange portion 365 forms by amount to bending on the direction of its diameter of increase greater than the diameter of the interior ring 340a of bearing 340.In the axial direction gap is very little between flange portion 365 and the bearing 340.Thus, can form a labyrinth shape 366 that between an end face of the bearing 340 of belt pulley 310 sides and a end face, has a very little gap at the flange portion 365 of housing 360 sides.By means of labyrinth shape 366, be difficult to invade the end face of bearing 340 from the freezing mixture of shaft seal 350 leakages.

As mentioned above, according to the 3rd embodiment of the present invention, by means of integrally formed flange portion 365 by amounting to crooked, this amounts to bending is to make on its direction greater than the interior ring 340a of bearing 340 at the diameter of belt pulley 310 sides at the end face of the cylindrical portions may 363 of increase main body underside portion 364, can form labyrinth shape 366 in the end of bearing 340 in belt pulley 310 sides.Thus, can prevent that leaking the freezing mixture that produces from shaft seal 350 invades the inside of bearing 340 from the end face of bearing 340.

(the 4th embodiment)

Fig. 4 is the sectional view of the 4th embodiment's of the present invention water pump.

The different piece of Fig. 4 and Fig. 1 is the shape of main body underside portion 464, other part is identical with first embodiment, therefore reference character is different from reference character among Fig. 1 adding 400 beginnings, and the description of having omitted the part identical with first embodiment.

Main body underside portion 464 has a cylindrical portions may 467, and this part has a minor diameter that links to each other with the interior ring of bearing 440.And, also being provided with a cylindrical portions may 468, the major diameter of this part links to each other with the external peripheral surface of shaft seal 450, and also the side with main body 462 links to each other.Cylindrical portions may 467 is made of the parts identical with main body underside portion 464 with 468.The cylindrical portions may 467 and the large diameter cylindrical portions may 468 of minor diameter have formed step shape.

Thus, shaft seal 450 and bearing 440 can arranged superposed on its diametric(al), and therefore, the size of belt pulley 410 on diametric(al) reduced.So just improved the installation capability of water pump on motor.

And the inner diameter of bearing can be less than the outer diameter of shaft seal, and therefore, the outside dimensions of bearing can be dwindled, and its weight and manufacture cost have all reduced.

(the 5th embodiment)

Describe the 5th embodiment of the present invention in detail with reference to Fig. 5 below.

The cylinder block 510 that constitutes internal-combustion engine 501 is the foundations that link to each other with water pump, and this cylinder block 510 has a pump chamber 511, and this pump chamber 511 communicates with a cooling water passage, and surperficial 513 places are opened wide in connection.

In Fig. 5, direction of arrow X1 represent axial length direction along shaft portion 550 from the outside direction to the inside of the cylinder block 510 of internal-combustion engine 501.Direction of arrow X2 represents that inside along the axial length direction of shaft portion 550 from the cylinder block 510 of internal-combustion engine 501 is to outside direction.

Water pump is fixed on the connection surface 513 of cylinder block 510, and has a main body 502, a pulley 504, a bearing 506 and a rotary blade part 508.Main body 502 utilizes the unshowned bolt of attachment hole 502x of passing to the connection surface 513 of the cylinder block 510 that constitutes internal-combustion engine 501.Main body 502 is made by punching press or metal plate component of roll extrusion (normally steel plate).

Main body 502 has a flange connector part 520, and this part 520 links to each other with the surface 513 that is connected of cylinder block 510 through the hermetic unit 514 of a ring-type, also has a cylindrical portions may 521 that is formed on its center portion.

The shape of cylindrical portions may 521 is hollow cylinders of a ladder, and has first cylindrical portions may 522 of direction along the axial length, one along the axial length its diameter of direction less than second cylindrical portions may 523 of first cylindrical portions may 522, one along the axial length its diameter of direction less than the 3rd cylindrical portions may 524 of second cylindrical portions may 523, one along the first upstanding wall part 525 that is connected first cylindrical portions may 522 and second cylindrical portions may 523 with axially perpendicular direction, and an edge is connected the second upstanding wall part 526 of second cylindrical portions may 523 and the 3rd cylindrical portions may 524 with axially perpendicular direction.

Pulley 504 is made of metal, and has a belt pulley part 540 by a belt 549 driven rotary, this belt 549 drives around the bent axle of transfer member by internal-combustion engine 501 as one, pulley 504 also has a shaft portion 550, and this part 550 is to insert the hollow circle tube of axial length direction.The pulley 504 that comprises belt pulley part 540 and shaft portion 550 is made by a metal sheet.Belt pulley part 540 have one along the axial length direction outer ring portion 541 and one along with the upstanding wall part 542 of axially perpendicular direction, and make by punching press.

Shaft portion 550 is made the drum of hollow by extruding calendering, and makes basic coaxially with belt pulley part 540, joins continuously with the inner circumference limit of the upstanding wall part 542 of belt pulley part 540.Shaft portion 550 has a upwardly extending axle hollow chamber 551 in axial length side that is separated by a circumferential wall, one is arranged on the front opening 552 of the forward end (cylinder block 510 sides of internal-combustion engine 501) of a hollow chamber 551, and a cardinal extremity opening 553 that is arranged on the terminal side (with cylinder block 510 opposite sides of internal-combustion engine 501) of a hollow chamber 551.

Shaft portion 550 is because its transverse section of formation is the circle of a hollow circle tube, and it is light making its weight.Therefore, the diameter of shaft portion 550 basically along the axial length direction be continuous, yet its diameter is not limited to this.According to this embodiment, as shown in Figure 5, though the front end 550p of shaft portion 550 direction along the axial length extends on arrow X1 indicated direction, front end 550p does not arrive the pump chamber 511 of the cylinder block 510 of internal-combustion engine 501, does not arrive the connection surface 513 of cylinder block 510.But the present invention is not limited thereto.

Bearing 506 turns pulley 504 relative main bodys 502, and has the outer shroud 560 of a ring-type, interior ring 561 and a plurality of ball body 562 that is arranged on therebetween of a ring-type.Bearing 506 is between main body 502 and pulley 504.Particularly, bearing 506 has in cylindrical portions may 521 between the inner circumferential surface of outer ring portion 541 of the external peripheral surface of the 3rd cylindrical portions may 524 of minor diameter and belt pulley part 540.

Therefore, the inner circumferential surface of bearing 506 is located by the 3rd cylindrical portions may 524 of main body 502, and the external peripheral surface of bearing 506 is located by the outer ring portion 541 of belt pulley part 540.In this way, bearing 506 utilizes the 3rd cylindrical portions may 524 that has minimum diameter in the cylindrical portions may 521 of main body 502 to locate, and therefore can dwindle the diameter of bearing 506.

According to this embodiment, be firm press fit between the 3rd cylindrical portions may 524 of main body 502 and the inner circumferential surface of bearing 506.The outer ring portion 541 of the belt pulley part 540 of pulley 504 and the external peripheral surface of bearing 506 also are firm press fits.By means of the firm press fit of these parts, guaranteed the performance that installs and fixes of bearing 506, improved the anti-detachment performance of bearing 506.And, the second upstanding wall part 526 of the cylindrical portions may 521 of main body 502 relies on an axial end 506a (opposite side of the cylinder block 510 of internal-combustion engine 501) of bearing 506 as a retainer, guaranteed the performance that installs and fixes of bearing 506 better, and its anti-detachment performance has been further improved also.

Rotary blade part 508 is made by metal stamping, and has a central boss part 580 and an a plurality of blade 586 that is remained one by central boss part 580 of being made by the extruding calendering.Central boss part 580 is arranged on along the relative side of the axial length direction of shaft portion 550 and blade 586.

The central boss part 580 of rotary blade part 508 is made of the lower hollow shape, and has a tubular body 582, and this tubular body 582 has the closure wall 583 of forward end that a hollow chamber 581 and is used for the hollow chamber 581 of closed tube body 582.The central boss part 580 of opposite side that is positioned at the blade 586 of rotary blade part 508 is connected to the inside of axle hollow chamber 551 of the shaft portion 550 of pulley 504 with firm press fit.In other words, the outer wall surface of the tubular body 582 of the central boss part 580 of rotary blade part 508 is press-fit into the inner wall surface with the pulley 504 that separates of axle hollow space 551 of shaft portion 550.

As shown in Figure 5, the closure wall 583 of the central boss part 580 of rotary blade part 508 enters a hollow chamber 551 with the insertion state of the shaft portion 550 of pulley 504, the inside of sealing axle hollow chamber 551, make the inside of a hollow chamber 551 become not connected state, prevent that the pump chamber 551 interior water of cylinder block 510 are bled into the axle hollow chamber 551 of shaft portion 550.

And the hollow chamber 581 of the tubular body 582 of rotary blade part 508 is directly relative with the pump chamber of cylinder block 510 511.In this case, this constituted mode helps increasing the volume of pump chamber 511.

Utilization is provided with seal arrangement 509 at the shaft portion 550 of pulley 504 and the press fit between the main body 502.Sealing plate 590 and a known mechanical seal 591 that sealing device 509 seals the ring-type of pump chamber 511 by being used between second cylindrical portions may 523 of main body 502 and shaft portion 550 constitute.By means of seal arrangement 509, can prevent that the pump chamber 511 interior water of cylinder block 510 are bled into bearing 506 sides.

As shown in Figure 5, the circumferential wall of the circumferential wall of shaft portion 550 and the tubular body 582 of rotary blade part 508 has constituted a double-walled construction, and such structure is good for the shaft portion 550 that reinforcement has seal arrangement 509.And, between the 3rd cylindrical portions may 524 of the cylindrical portions may 521 of main body 502 and shaft portion 550, formed an annular gap 529.And gap 529 is covered by belt pulley part 540, therefore can not find out this gap 529 from the outside.

In used embodiment, will constitute on the outer ring portion 541 of belt pulley part 540 that endless-belt 549 around transfer member hangs over the bent axle of internal-combustion engine 501 and pulley 504.

When driving bent axles by driving internal-combustion engine 501, the pulley 504 that includes belt pulley part 540 and shaft portion 550 is together rotated with it.Thereby, the blade 586 that is connected to the rotary blade part 508 on the shaft portion 550 rotates with identical direction in the inside of the pump chamber 511 of internal-combustion engine 501, water in the pump chamber 511 is transferred on the centrifugal force direction, realized the pumping operation that undertaken by blade 586, the water that is used to cool off is in the inner loop of the water channel of unshowned cylinder block 510.

As mentioned above, according to this embodiment, pulley 504 has the belt pulley part 540 that driven by belt 549 and forms the shaft portion 550 of one with belt pulley part 540, shaft portion 550 is drums of the direction hollow of extending along the axial length, and have a hollow chamber 551, be arranged on a hollow chamber 551 forward end front opening 552 and be arranged on the cardinal extremity opening 553 of the terminal side of a hollow chamber 551.

In this way, shaft portion 550 constitutes with the drum of the hollow of direction extension along the axial length, and be a hollow shape that does not have the no end of underside wall part, therefore, compare with the situation of the hollow shape that the end is arranged, improved the drawability (deep rolling performance) of the shaft portion 550 of pulley 504 with underside wall part.

And, according to this embodiment, pack into the inside of axle hollow chamber 551 of shaft portion 550 of pulley 504 of the central boss part 580 of rotary blade part 508.Therefore, different with partly pack into the situation of outside of shaft portion of pulley of the central boss of rotary blade part shown in Figure 12, the degree that front end 550p stretches out to rotary blade part 508 sides in the axial length direction of shaft portion 550 has reduced.

Just, according to this embodiment, a lot of in the axial length direction front end 550p of shaft portion 550 can exceedingly not stretch to the pump chamber 511 that pump chamber 551 sides so that front end 550p stretch into cylinder block 510.

In this way, according to this embodiment, fore-end has promptly reduced to the degree of stretching out that pump chamber 511 sides are stretched out to rotary blade part 508 in the axial length direction of the shaft portion 550 of pulley 504, and then can realize shortening the axial length of shaft portion 550.And, can also guarantee the drawability (deep rolling performance) of shaft portion 550.

Therefore, according to this embodiment,, also can improve the uniformity of wall thickness of the circumferential wall of shaft portion 550 even under the situation of serious calendering.Therefore, even under the situation of rotating belt wheel component 504, especially, under the situation of pulley 504 high speed rotating, this structure is very helpful for the formation of the rotary balance of the shaft portion 550 of balance pulley 504.

When the rotary balance of shaft portion 550 during, also further limited the skew of the axle core of shaft portion 550 in this way by further balance.This structure can also improve near the reliability of the seal arrangement 509 the shaft portion 550, and improves the durability of the bearing 506 of back shaft part 550 rotationally.And though along with the variation of the running state (during startup, running at high speed) of internal-combustion engine 501, revolution can be different, and the revolution of pulley 504 generally is in 700 to 10000rpm the scope.

According to this embodiment, as mentioned above, different with partly pack into the situation of outside of shaft portion of pulley of the central boss of rotary blade part, can shorten the axial length of shaft portion 550, therefore this structure helps on the axial length direction of shaft portion 550 center of gravity of rotary blade part 508 is converted to bearing 506 sides, and helps to make rotary blade part 508 to rotate reposefully.

According to this embodiment, the second upstanding wall part 526 of the cylindrical portions may 521 of main body 502 relies on the axial end 506a of bearing 506, as a retainer, and then the maintenance performance and the anti-detachment performance of assurance bearing 506.

And, as shown in Figure 5, constituted double-walled construction by the circumferential wall of the tubular body 582 of the circumferential wall of shaft portion 550 and rotary blade part 508, so this structure is good to the structure of strengthening shaft portion 550.

In this case, when occurring through the shaft portion 550 of extruding calendering and during through the work sclerosis of the circumferential wall of the tubular body 582 of the rotary blade part 508 of extruding calendering, this structure is also benefited to the circumferential wall of strengthening shaft portion 550.

As mentioned above, according to this embodiment, shaft portion 550 is upwardly extending cylindrical shapes in axial length side, and is the hollow shape of the no end that does not have the underside wall part, so its drawability is splendid.Therefore, even when the axial length dimension of shaft portion 550 is very big, this structure is also benefited to unhinderedly rolling shaft portion 550, though at the axial length that adopts setting shaft part 550 under the multiple situation all under the situation of long project organization, this structure also is good.

(the 6th embodiment)

6 the 6th embodiment of the present invention described below with reference to accompanying drawings.The 6th embodiment's structure and the 5th embodiment are basic identical, and have identical substantially service behaviour, also can reach the effect identical substantially with the 5th embodiment.Represent with identical mark with the 5th part that embodiment is identical.

To be described at its difference below.According to this embodiment, pulley 604 has by the belt pulley part 640 that drives as the belt 649 around transfer member with belt pulley part 640 and forms the shaft portion 650 of one.Shaft portion 650 is made by the extruding calendering, have the hollow cylinder shape that direction is along the axial length extended, and have a hollow chamber 651, be arranged on a hollow chamber 651 forward end front opening 652 and be arranged on the cardinal extremity opening 653 of the terminal side of a hollow chamber 651.

In this way, shaft portion 650 is drums of direction extension along the axial length, and is the hollow shape of the no end that does not have the underside wall part, has therefore guaranteed the drawability (deep rolling performance) of the shaft portion 650 of pulley 604.

According to this embodiment, the central boss part 680 of rotary blade part is loaded into the inside of axle hollow chamber 651 of the shaft portion 650 of pulley 604, compare with pack into the situation of outside of shaft portion 650 of pulley 604 of the central boss part 680 of rotary blade part, can shorten the axial length of shaft portion 650.

And, guaranteed the drawability (deep rolling performance) of shaft portion 650 because of this point.Promptly, different with partly pack into the situation of outside of shaft portion of pulley of the central boss of rotary blade part of the prior art shown in Figure 12, the degree that front end 650p stretches out to the rotary blade part side in the axial length direction of shaft portion 650, promptly the degree of stretching out of stretching out to pump chamber 611 sides has reduced, and front end 650p can excessively not stretch to pump chamber 611 sides in the axial length direction of shaft portion 650, and that front end 605p is stretched in the pump chamber 611 is a lot.

Therefore, according to this embodiment,, also can improve the uniformity of wall thickness of the circumferential wall of the shaft portion of making by calendering 650 even under the situation of serious calendering.Therefore, even under the situation of rotating belt wheel component 604, especially, under the situation that pulley 604 is at full speed rotated, this structure is very helpful for the formation of the rotary balance of the shaft portion 650 of balance pulley 604.

When rotary balance is further improved, also further limited pulley 604 shaft portion 650 the axle core skew, this structure can also improve near the reliability of the seal arrangement 609 the shaft portion 650, and improves the durability of the bearing 606 of back shaft part 650 rotationally.

Main body 602 is made by punching press or metal plate component of roll extrusion.As shown in Figure 6, main body 602 has a flange connector part 620, and this part 620 links to each other with the surface 613 that is connected of cylinder block 610 through the hermetic unit 614 of a ring-type, also has a cylindrical portions may 621 that is formed on its center portion.

Cylindrical portions may 621 has first cylindrical portions may 622 of direction along the axial length, one along the axial length its diameter of direction less than second cylindrical portions may 623 of first cylindrical portions may 622, one along the axial length its diameter of direction less than the 3rd cylindrical portions may 624 of second cylindrical portions may 623, one along the first upstanding wall part 625 that is connected first cylindrical portions may 622 and second cylindrical portions may 623 with axially perpendicular direction, and an edge is connected the second upstanding wall part 626 of second cylindrical portions may 623 and the 3rd cylindrical portions may 624 with axially perpendicular direction.

Main body 602 has one first curved section 631, and this part 631 relies on the axial end 606a (opposite side of the cylinder block 610 of internal-combustion engine 601) of bearing 606, as a retainer, is used to improve the maintenance performance of bearing 606.First curved section 631 is formed by the crooked second upstanding wall part 626.Just, as shown in Figure 6, second cylindrical portions may 623, the second upstanding wall part 626 and the 3rd cylindrical portions may 624 constitute transverse section that is roughly S shape and first curved section 631 that forms the axial end 606a that relies on bearing 606 along the axial length direction of shaft portion 650.

As shown in Figure 6, the belt pulley part 640 of pulley 604 has one second curved section 632, this part 632 relies on the axial end 606c (opposite side of the cylinder block 610 of internal-combustion engine 601) of bearing 606, as a retainer, is used to improve the maintenance performance of bearing 606.Second curved section 631 is formed by a crooked upstanding wall part 642.In other words, the part of the upstanding wall part 642 of belt pulley part 640 constitutes one and is roughly the transverse section of C shape or V-arrangement and forms second curved section 632 of the axial end 606c that relies on bearing 606 on the axial length direction of shaft portion 650.Whereby, improved the anti-detachment performance of bearing 606.

And, the 3rd cylindrical portions may 624 of the cylindrical portions may 621 of main body 602 and bearing 606 one between the ring 661, the inserting member 694 of a drum inserts therebetween basically coaxially in the inboard.And between an outer shroud 660 of outer ring portion 641 of belt pulley part 640 and bearing 606, the inserting member 696 of drum side outside inserts basically coaxially.

When the inserting member 696 of opposite side and the inserting member 694 in the inboard insert in this way, this structure helps reaching the adjustment to each diameter dimension of bearing 606, belt pulley part 640 and main body 602.And, the inboard inserting member 694 and the inserting member 696 in the outside have high rigidity, therefore, such structure helps improving the rigidity of the 3rd cylindrical portions may 624 of the rigidity of outer ring portion 641 of belt pulley part 640 and main body 602, and improves the water pump integral intensity.

According to this embodiment, the interference between the inserting member 696 of the opposite side of bearing 606 is arranged to relatively large, and also is arranged to relatively large at the inserting member 694 of inboard and the interference between the bearing 606.Interference between the outer ring portion 641 of the inserting member 696 in the outside and pulley 604 is arranged to less relatively, and, also be arranged to less relatively in the inserting member 694 and the interference between the main body 602 of inboard.

In Fig. 6, inner direction is pointed in the outside of arrow X1 direction indication along the axial length direction of shaft portion 650 from internal-combustion engine 601, and arrow X2 direction indication is along the axial length direction of shaft portion 650 direction away from the inside directed outwards of internal-combustion engine 601.Axial end 696a in internal-combustion engine 601 sides of the inserting member 696 in the outside stretches out the axial end 606a that is higher than bearing 606 along arrow X1 direction.One axial end 641a of the outer ring portion 641 of belt pulley part 640 stretches out away from bearing 606 along arrow X1 direction.

And as mentioned above, the axial end 641a in the outer ring portion 641 of the axial end 696a of the inserting member 696 in the outside and belt pulley part 640 that stretches out on arrow X1 direction away from bearing 606 is linked together by welding portion 695.Whereby, welding portion 695 is away from bearing 606, such structure help alleviating or the heat avoiding producing in the welding process to the influence of bearing 606, and then improve the reliability of bearing 606.

As shown in Figure 6,, just, stretch out along stretching out at the axial end 694c (opposition side of the cylinder 610 of internal-combustion engine 601) of the inserting member 694 of inboard along the direction of arrow X2 away from the direction of bearing 606.And an axial end 624c of the 3rd cylindrical portions may 624 of the cylindrical portions may 621 of main body 602 (opposition side of the cylinder 610 of internal-combustion engine 601) also stretches out along the direction of arrow X2, away from bearing 606.

As mentioned above, the axial end 624c in the 3rd cylindrical portions may 624 of the cylindrical portions may 621 of the axial end 694c of the inserting member 694 of inboard and main body 602 that stretches out away from bearing 606 along the direction of arrow X2 is linked together by welding portion 697.Whereby, welding portion 697 is away from bearing 606, and such structure helps alleviating or the heat avoiding producing in the welding process impacts bearing 606, and then improves the reliability of bearing 606.

In recent years, require to improve the reliability of belt 649 more and more.The outer ring portion 641 and the belt 649 of belt pulley part 640 are installed together, and therefore when producing pulling force on the outer ring portion 641 in belt pulley part 640, from the reliability of further improvement belt 649, such structure is not preferred.

In this respect, as shown in Figure 6, according to this embodiment, welding portion 695 is formed on the axial end 641a that stretches out along arrow X1 direction of outer ring portion 641 of belt pulley part 640, such structure helps limiting the pulling force of the outer ring portion 641 of welding middle belt pulley part 640, and welding portion 695 can be as much as possible away from the belt on the external peripheral surface that hangs over outer ring portion 641 649.

Therefore, can avoid belt hung over and be subjected to welding heat affected position, help improving the reliability of belt 649 like this.And, replacing welding portion 695 and 697, the inserting member 694 in the inboard also can be connected by riveted joint or bolt with main body 602, and the inserting member 696 in the outside also can be connected with aforesaid way with pulley 604.

As shown in Figure 6, rotary blade part has central boss part 680 and the blade of handling through deep rolling 686 a plurality of and these central boss part 680 formation one.Central boss part 680 is arranged on the opposition side of blade 686 on the axial length direction of shaft portion 650.

The central boss part 680 of rotary blade part is one end hollow shape to be arranged, and has a tubular body 682, and this tubular body 682 has the closure wall 683 of a forward end that a hollow chamber 681 and is used for the hollow chamber 681 of closed tube body 682.The central boss part 680 of opposition side that is positioned at the blade 686 of rotary blade part is press-fit into the inside of axle hollow chamber 651 of the shaft portion 650 of pulley 604 securely.

In other words, the outer wall surface of the tubular body 682 of the central boss part 680 of rotary blade part is press-fit into the inner wall surface of the axle hollow chamber 651 of the shaft portion 650 of separating pulley 604.The closure wall 683 of the central boss part 680 of rotary blade part has been sealed axle hollow chamber 651, make the phase circulation status of axle hollow chamber 651 of the shaft portion 650 of belt pulley part 604 become not connected state, and then prevent that the water in the pump chamber 611 from leaking into the axle hollow space 651 of shaft portion 650.

And the hollow chamber 681 of the tubular body 682 of rotary blade part is relative with pump chamber 611.

(the 7th embodiment)

7 the 7th embodiment of the present invention described below with reference to accompanying drawings.The 7th embodiment's structure and the 5th embodiment are basic identical, and have identical substantially service behaviour, also can reach the effect identical substantially with the 5th embodiment.Represent with identical mark with the 5th part that embodiment is identical.

To be described at its difference below.According to this embodiment, pulley 704 has by the belt pulley part 740 that drives as the belt 749 around transfer member with belt pulley part 740 and forms the shaft portion 750 of one.Shaft portion 750 has the hollow cylinder shape that direction is along the axial length extended, and have a hollow chamber 751, be arranged on a hollow chamber 751 forward end front opening 752 and be arranged on the cardinal extremity opening 753 of the terminal side of a hollow chamber 751.

In this way, shaft portion 750 is drums of direction extension along the axial length, and is the hollow shape of the no end that does not have the underside wall part, has therefore guaranteed the drawability (deep rolling performance) of the shaft portion 750 of pulley 704.

According to this embodiment, the central boss part 780 of rotary blade part 708 is loaded into the inside of axle hollow chamber 751 of the shaft portion 750 of pulley 704, compare with pack into the situation of outside of shaft portion 750 of pulley 704 of the central boss part 780 of rotary blade part 708, can shorten the axial length of shaft portion 750.

And, guaranteed the drawability (deep rolling performance) of shaft portion 750 because of this point.Just, the central boss part 780 of rotary blade part 708 can be configured to point to belt pulley part 740 promptly along the direction of the arrow X2 among Fig. 7, therefore different with partly pack into the situation of outside of shaft portion of pulley of the central boss of rotary blade part of the prior art shown in Figure 12, the degree that front end 750p stretches out to rotary blade part 708 sides on the axial length direction of shaft portion 750 has promptly reduced to the degree of stretching out that pump chamber 711 sides are stretched out, and front end 750p can exceedingly not stretch to pump chamber 711 sides on the axial length direction of shaft portion 750.

Therefore, even under the situation of serious calendering, also can limit nonuniformity by the wall thickness of the circumferential wall that rolls the shaft portion 750 that forms.Therefore, even under the situation of rotating belt wheel component 704, especially, under the situation that pulley 704 is at full speed rotated, this structure helps the formation of rotary balance of the shaft portion 750 of balance pulley 704, and can improve near the reliability of the mechanical seal the shaft portion 750, and improve the durability of the bearing 706 of back shaft part 750 rotationally.

Main body 702 is made by punching press or metal plate component of roll extrusion.Main body 702 has the flange connector parts 720 that surface 713 links to each other that are connected through the hermetic unit 714 of a ring-type and cylinder block 710, also has a cylindrical portions may 721 that is formed on its center portion.

The shape of cylindrical portions may 721 is cylindrical bodys of a ladder, and has first cylindrical portions may 722 of direction along the axial length, one along the axial length its diameter of direction greater than second cylindrical portions may 723 of first cylindrical portions may 722, one along the axial length its diameter of direction less than the 3rd cylindrical portions may 724 of second cylindrical portions may 723, one along the first upstanding wall part 725 that is connected first cylindrical portions may 722 and second cylindrical portions may 723 with axially perpendicular direction, and an edge is connected the second upstanding wall part 726 of second cylindrical portions may 723 and the 3rd cylindrical portions may 724 with axially perpendicular direction.

Even second cylindrical portions may 723, the first upstanding wall part 725 and the second upstanding wall part 726 have formed a drain chamber 735. when the process of the water in the pump chamber 711 seal arrangement 709, water also is stored in the drain chamber 735 of main body 702.The water that excessively is stored in the drain chamber 735 is discharged from the discharge orifice 736 of the second upstanding wall part 726 of main body 702.

As shown in Figure 7, according to this embodiment, the inner circumferential surface of bearing 706 is relative with shaft portion 750, and the external peripheral surface of bearing 706 is relative with the 3rd cylindrical portions may 724 of main body 702 through inserting member 796.And the shaft portion 750 of belt wheel parts 704 is made of an axle with a plurality of steps of a plurality of diameters (inner diameter, outer diameter).Just, shaft portion 750 has a large diameter the first axle part and divides 750m and a diameter coaxial with it to divide the second axle part of 750m to divide 750n less than the first axle part.

In this way, shaft portion 750 is one to have the columnar structured of a plurality of ladders, therefore, shaft portion 750 can be squeezed into stepped to minor diameter from major diameter calendering, the extruding drawability of shaft portion 750 has also further been improved, and, be easy to also realize that the axial length with shaft portion 750 is set at long situation.

Therefore, as shown in Figure 7, the front end 750p of shaft portion 750 arrives the connection surface 713 of the cylinder block 710 of internal-combustion engine 701 on the direction of arrow X1, and the inside of the pump chamber 711 of the cylinder block 710 of arrival internal-combustion engine 701.Yet the present invention is not limited thereto, and the front end of shaft portion 750 also can not arrive the connection surface 713 of the cylinder block 710 of the internal-combustion engine 701 on the direction of arrow X1.

The bearing 706 of ring-type divides greater than the second axle part between the 3rd cylindrical portions may 724 that the first axle part of 750n divides 750m and main body 702 at diameter.Whereby, for the big situation of the diameter dimension of bearing 706, also can be suitable for.And when the diameter dimension of bearing 706 was big, this structure helped the improvement of bearing reliability and the raising in working life.

As shown in Figure 7, the belt pulley part 740 of pulley 704 has one second curved section 732, this part 732 relies on the axial end 706c (opposition side of the cylinder block 710 of internal-combustion engine 701) of bearing 706, as a retainer, is used to improve the maintenance performance of bearing 706.Second curved section 732 is formed by a upstanding wall part 742 of curved belt wheel part 740.In other words, the upstanding wall part 742 of belt pulley part 740 has the part that a transverse section is roughly C shape or V-arrangement along the axial length direction of shaft portion 750, and formation relies on second curved section 732 of the axial end 706c of bearing 706 as a retainer.Whereby, can improve the anti-detachment performance of bearing 706.

As shown in Figure 7, between the outer shroud 760 of the 3rd cylindrical portions may 724 of main body 702 and bearing 706, a columnar inserting member 796 inserts therebetween substantially coaxially.When inserting member 796 inserted in this way, resulting structure helped realizing the adjustment of each diameter dimension of bearing 706 and main body 702.

And such structure helps increasing the rigidity of the 3rd cylindrical portions may 724 of the cylindrical portions may 721 of main body 702.Axial end 724c in the 3rd cylindrical portions may 724 of the main body 702 of upstanding wall 742 sides of belt pulley part 740 stretches out Δ M (as shown in Figure 7) along direction shown in the arrow X2 from bearing 706.

Axial end 796c at the inserting member 796 of upstanding wall part 742 sides of belt pulley part 740 stretches out Δ M (as shown in Figure 7) along direction shown in the arrow X2 from bearing 706.The axial end 724c of the axial end 796c of the inserting member 796 that stretches out from bearing 706 in this way along direction shown in the arrow X2 and the 3rd cylindrical portions may 724 of main body 702 couples together with welding portion 798.Connect in this way, make that welding portion 798 can be away from bearing 706, such structure helps the raising of bearing reliability, and can improve the durability of bearing 706.

As shown in Figure 7, the axial length of columnar inserting member 796 is configured to the axial length greater than the 3rd cylindrical portions may of main body 702.Therefore, the axial end 796a of the inserting member 796 of internal-combustion engine 701 sides stretches out Δ K (as shown in Figure 7) to rotary blade part 708 sides from the 3rd cylindrical portions may 724 of main body 702, promptly on the axial length direction of the shaft portion shown in the arrow X1 750.

The part of axial end 796a by utilizing inserting member 796 is stretched out on the direction shown in the arrow X1 in this way, fixes the axial end 706a side of bearing 706.Thus, such structure helps bearing 706 is relied on rotary blade part 708 sides, promptly helps shortening the axial length dimension of water pump in direction shown in the arrow X1.

And, replacing welding portion 798, inserting member 796 and main body 702 can couple together with a riveting portion.

Rotary blade part 708 has central boss part 780 and the blade of handling through deep rolling 786 a plurality of and central boss part 780 formation one.Central boss part 780 is arranged on the opposition side of blade 786 along the axial length direction of shaft portion 750.

The central boss part 780 of rotary blade part 708 is one the hollow shape at the end to be arranged, and has a tubular body 782, and this tubular body 782 has the closure wall 783 of forward end that a hollow chamber 781 and is used for the hollow chamber 781 of closed tube body 782.The central boss part 780 of opposite side that is positioned at the blade 786 of rotary blade part 708 is press-fit into the inside of axle hollow chamber 751 of the shaft portion 750 of pulley 704 securely.

In other words, the outer wall surface of the central boss part 780 of rotary blade part 708 is press-fit into the inner wall surface of the axle hollow chamber 751 of the shaft portion 750 of separating pulley 704.The axle hollow chamber 751 of the shaft portion 750 of the closure wall 783 sealing pulley 704 of the central boss part 780 of rotary blade part 708 prevents that the water in the pump chamber 711 is bled into the axle hollow chamber 751 of shaft portion 750.

And the hollow chamber of the tubular body 782 of rotary blade part 708 is relative with pump chamber 711.

Though according to the above embodiments, the central boss part that is positioned at the opposite side of rotary blade part is press-fit into the inside of axle hollow chamber of the shaft portion of pulley securely, but the central boss part also can be press-fit in it securely, and can be to be fixed to the upper, or utilize the mode of machine riveting to be fixed to the upper with welding method.Though the above embodiments are to be used in to be installed to be used to the water pump carrying and feed water on the car combustion engine, present embodiment also is applicable to the water pump that being used on the motor that is installed to other carries and feed water.

(the 8th embodiment)

The sectional view of Fig. 8 shows the present invention and is used for the 8th embodiment on the engine water pump.

In Fig. 8, water pump 801 comprises a belt pulley 810, an impeller 830, a bearing 840, a shaft seal (shaft sealing) 850, a housing (body) 860 and a Sealing 880.

Belt pulley 810 is one the cylindrical shape at the end to be arranged basically, and the end face of one side (being the right side shown in the figure) opens wide, and at opposite side (being the left side shown in the figure) an end face 810a is arranged.

The drum surface of belt pulley 810 has an outwardly directed extension 811 in end face 810a side (in the axial direction side of belt pulley) in its whole circumference upper edge diametric(al), the diameter of drum surface is reduced, belt pulley 810 has the drum surface 810b that extends to a side, has constituted a belt land surface.

And end face 810a has a step part 810c, stretch out with taper shape to a side near the heart therein, and shaft portion (axle) 820 extends with cylindrical shape near middle mind-set one side of step part 810c.Groove part shown in Fig. 8 and 9 (intercommunicating pore) 810d is formed between step part 810c and the end face 810a, is used for the inside and outside connection of belt pulley.

Here all step part 810c, shaft portion 820, extension 811 and belt land surface 810b all with belt pulley 810 concentric settings.Belt pulley 810 can be by punching press one plate as one through the steel plateelement of corrosion-resistant treatments and form, and perhaps belt pulley 810 also can be made and carried out corrosion-resistant treatments after making by steel plate.For example, the body portion 864 of body or housing 860 is handled and is made through punching press or roll extrusion by a metal sheet.Belt pulley 810 with shaft portion 820 of a hollow circle tube is made through punching press and/or extrusion process by metal sheet.

Impeller 830 is a kind of, can be described as opening impeller, has a discoidal foundation 830b and several blade 830c that stretch out from it.Center at the foundation 830b of impeller 830 is formed with an extension 830a, is used to insert an inner circumferential surface of shaft portion 820.According to this embodiment, extension 830a and shaft portion 820 are connected to each other through press fit, relative to can not rotating, thereby guarantee liquid seal between housing 860 and outside liquid.

Housing 860 has a main body 862, and this part 862 has an intake section 862a, and a delivery port, a not shown and recessed portion 861 and are connected to the main body underside portion 864 on the end face of main body 862.Main body 862 can be an aluminium mold product for example, also can be to make one with the cylinder block or the timing tape housing of motor.

Main body underside portion 864 is made disc-shape substantially, and near its center, diameter stretches out on the direction away from main body 862 less than the cylindrical portions may 863 of the outer diameter of main body underside portion 864.Main body underside portion 864 is made through the steel plate of corrosion-resistant treatments as one by punching press one disk shaped part.Main body 862 and main body underside portion 864 are connected by bolt via Sealing 880, and be not shown in the drawings.Thus, the groove part 861 of main body 862 and the space of the maintenance liquid seal between the main body underside portion 864 have been formed.

Above-mentioned space has constituted a hydroecium 870, and impeller 830 is positioned at this hydroecium 870.

The inner circumferential surface 863a of the cylindrical portions may 863 of main body underside portion 864 links to each other with the external peripheral surface of shaft seal 850, passes through press fit between the two, can not relatively rotate each other.And the external peripheral surface of shaft portion 820 links to each other with the inner circumferential surface of shaft seal 850, equally also is to connect through press fit, can not relatively rotate each other.Here, the inside and outside circumferential surface of shaft seal 850 is relatively turnable each other.Shaft seal 850 is a kind of known mechanical seal device.

And the external peripheral surface 863b of the cylindrical portions may 863 of main body underside portion 864 links to each other with an interior ring of bearing 840 via press fit, can not relatively rotate each other.Simultaneously, the inner circumferential surface 810e of the belt land surface 810b of belt pulley 810 can not link to each other via press fit each other with the outer shroud of bearing 840 with relatively rotating.Here, bearing 840 is a kind of known rolling bearings.

Thus, belt pulley 810 is supported by bearing 840, and is rotatable with respect to housing 860.

The 8th embodiment's of various details working condition.

Belt pulley 810 is driven through the belt 890 that engages with the belt land surface 810b of belt pulley 810 by the rotatory force of the unshowned in the drawings output shaft from motor.Along with the rotation of belt pulley 810, the shaft portion 820 that forms one with belt pulley 810 also rotates with identical direction.And, with the also rotation in the hydroecium 870 of housing 860 of impeller 830 of shaft portion 820 one.

Now, freezing mixture is filled in the hydroecium 870, and therefore, by the centrifugal force that rotation produced by impeller 830, the freezing mixture at the center of close hydroecium 870 is carried by impeller 830 on the excircle direction of impeller 830.In this way, carry out center from impeller by centrifugal force to its outside pumping.Thus, in hydroecium 870, produce pressure difference between the center of rotation of close impeller 830 and its outer periphery, freezing mixture sucks hydroecium 870 inside from the intake section 862a of the center of rotation of close impeller 830.

And the pumping by impeller 830, freezing mixture is pressed into outer circumference portion, and is transported to the each several part of the motor that needs cooling by a unshowned delivery port that is positioned at outer circumference portion.

In view of being full of freezing mixture in the hydroecium 870, belt pulley 810 communicates with atmosphere by groove part 810d.But sealed 880 in the gap between main body 862 and the main body underside portion 864 seals airtightly, and the gap between shaft portion 820 and the main body underside portion 864 seals by disposed axle Sealing 850 airtightly.

As mentioned above, according to the 8th embodiment of the present invention, shaft seal 850 is arranged between the external peripheral surface of shaft portion 820 of the inner circumferential surface 863a of cylindrical portions may 863 of main body underside portion 864 and belt pulley 810.As its characteristic, the leakage meeting that appears at the freezing mixture in the shaft seal 850 seldom.

For example, under the state of rest of motor, if freezing mixture leaks at shaft seal 850 places, between the inner circumferential surface 863a of the freezing mixture that leaks through shaft portion 820 and cylindrical portions may 863, arrive the inner space 812 of the ring-type that separates by the inner circumferential surface 811a of the inner circumferential surface 810e of the belt land surface 810b of belt pulley 810 and extension 811 and end face 810a and step part 810c.

As shown in Figure 8, the bottom of inner space 812 is made of the inner circumferential surface 810e of belt land surface 810b and the inner circumferential surface 811a of extension 811.Here, the position on the substantially horizontal of the inner circumferential surface 811a of the extension shown in the figure 811 is lower than the position on the substantially horizontal of the inner circumferential surface 810e of belt land surface 810b.Therefore, the freezing mixture of leakage can not be stored near the inner circumferential surface 810e of belt land surface 810b in the inner space 812, but is stored in the inner circumferential surface 811a side of extension 811.

Simultaneously, shown in Fig. 8 or 9, end face 810a has groove part 810d (controlling device).In this case, groove part 810d shown in lower position, the position than on the substantially horizontal of the inner circumferential surface 810e of belt land surface 810b on open wide.Thus, the freezing mixture of leakage can be discharged to the outside of belt pulley 810 apace from groove part 810d.The freezing mixture of discharging is derived from the end face 810a of belt pulley 810, and falls from the external peripheral surface 811b of extension 811.

In this case, in the axial direction along reach the outside on the diametric(al) on its whole circumference, therefore, because the existence of extension 811, freezing mixture can not arrive drum surface (belt land surface) 810b to extension 811 in belt pulley 810 sides.Therefore, the opposite influence that can avoid damage (heaving or the decline of intensity of belt) to the belt rubber parts or the drying medium composition in the freezing mixture to adhere on the belt being caused, thereby the working life that can improve belt.

But also can prevent between belt land surface and the belt reduction of the friction that the intervention owing to freezing mixture causes and then the slippage of the belt that causes, therefore can avoid the appearance of the loss of pump driving torque, also can prevent the wearing and tearing of the belt that the slippage owing to belt causes.

Though bearing 840 is arranged between the external peripheral surface 863b of the inner circumferential surface 810e of belt land surface 810b of belt pulley 810 and cylindrical portions may 863, freezing mixture can not be stored near the bearing but be stored in extension 811 places.Therefore, need not consider that the freezing mixture that leaks can invade the inside of bearing.Thus, can prevent the reduction of bearing lubrication grease quality and the appearance of bearing internal corrosion, therefore the working life that also can improve bearing.

(the 9th embodiment)

The sectional view of Figure 10 shows the present invention and is applied to the 9th embodiment on the engine water pump.And the 9th embodiment and the 8th embodiment's the different structures that only are belt pulley, therefore, for the 8th the identical parts of embodiment, reference character is to add 900 on the 8th embodiment's reference character, and has omitted the description to same section.

In Figure 10, water pump 901 comprises a belt pulley 910, an impeller 930, a bearing 940, a shaft seal 950, a housing 960 and a Sealing 980.

Belt pulley 910 has one first end surfaces (first annular surface) 913b, this surface is by form a drum that the cardinal principle at the end arranged with right-angle bending one drum surface (the first drum surface 913a), one end face of one side opens wide, and has an end face 910a at opposite side, in a side, by forming one second drum surface 913c with the right-angle bending first end surfaces 913b, and extend this surface to opposite side, the one columnar shaft portion (the 3rd drum surface 920) that forms with the right-angle bending second end surfaces 913d with second end surfaces (second annular surface) 913d that forms at the opposite side right-angle bending second drum surface 913c and also extends this surface to this side.

Belt 990 engages with the external peripheral surface 913a1 of the first drum surface 913a, and the external peripheral surface 913a1 of the first drum surface 913a is as the belt land surface of belt pulley 910.The first annulus 912a (first space) that stretches out to belt pulley 910 1 sides with the horizontal end face of tunnel-shaped is separated out by the inner circumferential surface 913a2 of the first drum surface 913a of belt pulley 910, the other end surface 910a, the first end surfaces 913b of belt pulley 910 and the external peripheral surface 913c1 of the second drum surface 913c.

The end surfaces 910a of belt pulley 910 is and the perpendicular annular surface of the first drum surface 913a as shown in figure 11, to have the predetermined length at sensing center, and open wide from here.

And, the first drum surface 913a stretches out laterally in whole circumference upper edge diametric(al) and forms an extension 911, and this part 911 is formed near the angle part that the first drum surface 913a by end surfaces 910a and belt pulley 910 constituted (the axial direction side of belt pulley 910).

And, have one and fall the horizontal end face of tunnel-shaped and be separated into by inner circumferential surface 913c2, the second end surfaces 913b of the second drum surface 913c and the external peripheral surface 920a of shaft portion 920 to second annulus (second space) 912b that the opposite side of belt pulley 910 stretches out.In the office, bight that constitutes by the second drum surface 913c and the second end surfaces 912b, be provided with one and be used to groove part 910d (connected part) that the first annulus 912a and the second annulus 912b are connected.

Here, the first drum surface 913a, the first end surfaces 913b, the second drum surface 913c, the second end surfaces 913d, the first and second annulus 912a and 912b and all coaxial setting of shaft portion 920.

Belt pulley 910 utilizes a plate-like piece, makes via plastic deformation such as punching press through the steel plate of corrosion-resistant treatments as one.Perhaps, belt pulley 910 also can be carried out corrosion-resistant treatments with steel plate again after via plastic deformation such as punching press and made by steel plate.

And the interior ring of bearing 940 is connected to through press fit on the external peripheral surface 963b of cylindrical portions may 963 of main body underside portion 964, can not rotate toward each other.The outer shroud of bearing 940 is connected to through press fit on the inner circumferential surface 913c2 of the second drum surface 913c of belt pulley 910, can not rotate toward each other.Here, bearing 940 is a kind of known rolling bearings.

Thus, belt pulley 910 is supported by housing 960 by bearing 940, and both are rotatable toward each other.

The 9th embodiment's of various details working condition.

Similar to above-mentioned the 8th embodiment, shaft seal 950 is arranged between the external peripheral surface 920a of shaft portion 920 of the inner circumferential surface 963a of cylindrical portions may 963 of main body underside portion 964 and belt pulley 910.As its characteristic, the leakage meeting that appears at the freezing mixture in the shaft seal 950 seldom.

For example, under the state of rest of motor,, between the inner circumferential surface 963a of the freezing mixture of leakage through shaft portion 920 and cylindrical portions may 963, arrive the second annulus 912b of belt pulley 910 if freezing mixture leaks at shaft seal 950 places.Groove part (circulation part) 910d shown in the second annulus 912b the left side below open wide, therefore, the lower end shown in the freezing mixture of leakage is directed to through groove part 910d.

The first annulus 912a is separated out at the excircle place of the second annulus 912b.The freezing mixture that leaks is directed to the first annulus 912a through groove part 910d.Here, the end surfaces 910a that separates the belt pulley 910 of the first annulus 912a extends a predetermined length on the direction of reduced, then open wide.Thus, a certain amount of freezing mixture of leakage can be stored among the first annulus 912a.

When the amount of the freezing mixture that leaks from shaft seal 950 during more than above-mentioned prearranging quatity, the end surfaces 910a that the freezing mixture of leakage is crossed belt pulley 910 flow to the outside of the first annulus 912a from opening 910b.Flow to its outside freezing mixture and be directed at the end surfaces 910a of belt pulley 910, and shown in lower direction on flow out.

And freezing mixture arrives extension 911 and falls.The external peripheral surface of extension 911 shown in substantially horizontal on the position be lower than the position of the external peripheral surface 913a1 of the first drum surface 913a, therefore because the existence of extension 911 is arranged, freezing mixture can not arrive the external peripheral surface 913a1 that engages with belt 990.

Therefore, the opposite influence that can avoid damage (heaving or the decline of intensity of belt) to the belt rubber parts or the drying medium composition in the freezing mixture to adhere on the belt being caused, thereby the working life that can improve belt.

But also the reduction that can prevent between engaging surface and the belt friction that the intervention owing to freezing mixture causes makes the belt slippage and then the appearance of the pump driving torque loss that causes, can also prevent the wearing and tearing of the belt that the slippage owing to belt causes.

Though bearing 940 is arranged in the second annulus 912b between the inner circumferential surface 913c2 of the cylindrical portions may 963 and the second drum surface 913c, but by means of groove part 910d, the freezing mixture that leaks from shaft seal 950 can not be stored in the second annulus 912b, but flows out to the first annulus 912a immediately.

Therefore, need not consider that the freezing mixture that leaks can invade the inside of bearing.Thus, can prevent the reduction of bearing lubrication grease quality and the appearance of bearing internal corrosion, therefore the working life that also can improve bearing.

Owing to can make a lot of visibly different embodiments of the present invention under the prerequisite that does not depart from aim of the present invention and scope, therefore, what can expect is that except defined in its appended claim, the present invention is not limited to each certain embodiments.

Claims (4)

1. water pump, this water pump comprises:

One belt pulley, this belt pulley rotates and has the shaft portion that extends along axis direction of heart position therein from the moment of torsion of a driving source by accepting one;

One impeller, it is fixed on the described shaft portion and with described shaft portion and together rotates;

One main body, the hydroecium that this main body formation one and impeller are arranged together;

One cylindrical portions may of stretching out with cylindrical shape from described main body;

One supports the bearing of described belt pulley rotationally in cylindrical portions may; With

One shaft seal, it drives described bearing and the sealing of described hydroecium;

It is characterized in that described shaft seal is fixed between the inner circumferential surface of cylindrical portions may of the external peripheral surface of described shaft portion of belt pulley and main body, make shaft seal and bearing be arranged to small part overlapping; Described axial region forms one by metal sheet and described belt pulley, so that the axial region rotation.

2. water pump as claimed in claim 1 is characterized in that, the outer shroud of bearing is connected on the inner circumferential surface of belt pulley, and ring is connected on the external peripheral surface of cylindrical portions may in it, and shaft seal is connected on the inner circumferential surface of cylindrical portions may.

3. water pump as claimed in claim 2 is characterized in that, a part that is connected to the impeller on the shaft portion is one bag of shape, and opens wide at the end face of the shaft portion that is fixed to the side on the impeller.

4. water pump as claimed in claim 1 is characterized in that described shaft portion comprises a hollow chamber, and described impeller comprises central boss part and blade, and this central boss partly is installed on the inside or outside of axle hollow chamber of described shaft portion.

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