JP2014101821A - Water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump capable of suppressing direct intrusion of foreign substances such as water and dust into a ball bearing from working holes.SOLUTION: A water pump includes a driving shaft 7 rotatably supported inside of a pump housing 2 through a ball bearing 4, a pulley 5 integrally connected to a large-diameter shaft portion 7a of the driving shaft through an end wall 5a, an impeller 8 connected to a small-diameter shaft portion 7c of the driving shaft, a cylindrical portion 5b integrally disposed on an outer periphery of the end wall, a metallic insert 6 fixed to an inner periphery of the cylindrical portion for press-fitting and holding the ball bearing, and a plurality of working holes 5e penetrating through the end wall. The metallic insert has a cylindrical body 6a and a flange portion 6b formed by radially bending an end portion of the body, and a circular locus Q connecting an outer edge, of each working hole is disposed at an inner side with respect to an inner peripheral face 6c of the metallic insert.

Description

  The present invention relates to a water pump used to supply cooling water for cooling an internal combustion engine, for example, into the internal combustion engine.

  As a conventional water pump, what is described in the following patent document 1 is known.

  Briefly, the water pump includes a pump housing having a pump chamber therein, a synthetic resin drive shaft rotatably supported in the pump chamber, and a disk-shaped end wall at one end of the drive shaft. A pulley made of synthetic resin that is integrally coupled through a ball bearing, a ball bearing that is provided on the inner peripheral side of the pulley via a cylindrical metal insert, and a roller that is integrally rotatable on the other end of the drive shaft. And a mechanical seal provided between the impeller and the pulley.

  In addition, a plurality of work holes are provided at equidistant positions in the circumferential direction of the end wall. Each of the working holes is for inserting a jig for press-fitting the outer ring of the ball bearing into the metal insert into the pulley when assembling the constituent members.

  That is, when the components are assembled, a press-fitting jig is brought into contact with the front end surface of the flange portion integrally formed with the front end edge of the metal insert, and the outer ring of the ball bearing is press-fitted into the inner peripheral surface of the metal insert. It is supposed to be.

Japanese Patent Laid-Open No. 2002-349481

  However, each of the working holes has a relatively large inner diameter because the press-fitting jig is inserted to press the outer ring of the ball bearing from the axial direction. The diameter of the circular locus connecting the outer end edges of the holes is larger than the outer diameter of the outer ring of the ball bearing. As a result, foreign matters such as water and dust can easily enter the ball bearing through each work hole, and water and dust can easily adhere to the ball bearing, resulting in rust and the like. There is a risk of lowering.

  The present invention has been devised in view of the actual situation of the conventional water pump, and provides a water pump capable of suppressing entry of foreign matters such as water and dust into the ball bearing from the respective working holes. Is.

According to the first aspect of the present invention, a pump housing having a pump chamber therein, a drive shaft rotatably supported in the pump housing, and one end of the drive shaft are integrally coupled via an end wall. A pulley formed integrally with the drive shaft by a synthetic resin material, a cylindrical metal member fixed to the inner periphery of a cylindrical portion integrally formed on the outer periphery of the end wall of the pulley, and the metal member A bearing that is interposed between the pump housing and rotatably supports the drive shaft, and an impeller that is housed in the pump chamber and that is integrally rotatable with the other end of the drive shaft. And comprising
A plurality of holes are formed in the end wall so as to penetrate along the axial direction, the holes are disposed on the inner side of the inner peripheral surface of the metal insert, and a part of the metal insert is disposed on the inner surface of the end wall. And between the bearing end surface facing the inner surface.

  According to the present invention, the holes are arranged on the inner side in the radial direction of the inner peripheral surface of the metal insert, and the diameter of the holes is reduced, so that water, dust, and the like are discharged from the holes in the ball bearing direction. It is possible to suppress entry into

It is a longitudinal section of a 1st embodiment of a water pump concerning the present invention. It is a disassembled perspective view of the water pump in this embodiment. It is A arrow directional view of FIG. It is a longitudinal cross-sectional view of the pulley integrally molded with the drive shaft provided for this embodiment. It is a front view of the pulley provided for this embodiment. It is a front perspective view of the metal insert provided to this embodiment. It is a front view of the metal insert provided to this embodiment. It is a longitudinal cross-sectional view of the metal insert provided to this embodiment. It is a disassembled perspective view of the impeller provided to this embodiment. It is a back perspective view of the impeller provided for this embodiment. It is a front perspective view of the metal insert which shows 2nd Embodiment of this invention. It is a front perspective view of the metal insert which shows 3rd Embodiment of this invention. It is a front perspective view of the metal insert which shows 4th Embodiment of this invention. It is a front perspective view of the metal insert which shows 5th Embodiment of this invention. It is a front perspective view of the metal insert which shows 6th Embodiment of this invention.

Hereinafter, each embodiment of the water pump according to the present invention will be described in detail with reference to the drawings.
[First Embodiment]
The water pump 1 is applied to a cooling device that circulates an antifreeze liquid (ethylene glycol) that is cooling water between a radiator of an automobile and an internal combustion engine.

  As shown in FIGS. 1 and 2, the water pump 1 is attached to a side of a cylinder block outside the figure of the internal combustion engine by bolts, and has a pump housing 2 having a pump chamber 3 in a front end portion on the cylinder block side, A pulley 5 rotatably supported by a ball bearing 4 as a single bearing on the front end side of the pump housing 2, a metal insert 6 interposed between the pulley 5 and the ball bearing 4, The pump housing 2 is inserted into the pump housing 2. One end of the drive shaft 7 is integrally formed with the pulley 5. The other end of the drive shaft 7 is fixed to the pump housing 3. An impeller 8 and a mechanical seal 9 interposed between the pump housing 2 and the drive shaft 7 to seal between the pump chamber 3 and the ball bearing 4. It is configured as.

  The pump housing 2 is integrally formed of an aluminum alloy material, the housing body 10 on the pump chamber 3 side is formed in a deformed annular shape, and a cylindrical portion having a step diameter is formed on the rear end side of the housing body 10. 11 is integrated.

  The housing body 10 is formed with a flat annular mounting surface 10a that abuts against a flat portion at the side of the cylinder block at the front end, and a mounting bolt that is screwed and fixed to the cylinder block is inserted through the outer periphery. A plurality of boss portions 10c constituting the bolt hole 10b are provided.

  In addition, a discharge port 10d that discharges cooling water flowing into the pump chamber 3 from a radiator-side intake port (not shown) into the water jacket in the cylinder block as the impeller 8 rotates is provided inside the housing body 10. Is formed.

  As shown in FIGS. 1 and 2, the cylindrical portion 11 includes a large-diameter portion 11a on the pump chamber 3 side, a medium-diameter portion 11b extending from the large-diameter portion 11a in the ball bearing 4 direction, And a small-diameter portion 11c extending from the middle-diameter portion 11b to one end side of the drive shaft 7.

  In the middle diameter portion 11b, a drain hole 12 through which a water droplet leaking from the mechanical seal 9 flows downward is formed penetrating in the vertical direction, and below the drain hole 12 A drain chamber 13 for storing water drops dripped from the drain hole 12 is formed across the inside of the large diameter portion 11a. The drain chamber 13 is liquid-tightly sealed with a drain cap 14 at the lower end opening.

  Further, an air release hole 15 is formed on the upper side in the gravity direction of the medium diameter portion 11b to discharge the water vapor of the cooling water leaked from the mechanical seal 9 or stored in the drain chamber 13 or the like. Has been. Furthermore, an annular space chamber 16 is formed between the inner diameter portion 11b and the drive shaft 7, and the annular space chamber 16 includes the drain hole 12 and an air opening hole. 15 is communicated in the vertical direction. In addition, a cylindrical bulging portion 11e that forms an air communication hole 23 that connects the air opening hole 15 and the atmosphere is integrally formed on the outer periphery of the medium diameter portion 11b.

  The ball bearing 4 is a general one, and as shown in FIGS. 1 and 2, an inner ring 4a press-fitted into the small diameter portion 11, an outer ring 4b press-fitted into the insert 6, and the inner ring 4a. And a plurality of balls 4c provided between the outer ring 4b and the outer ring 4b via a cage.

  The inner ring 4a is restricted in its maximum axial press-fitting position by an annular protrusion 11d provided at the front end edge of the medium diameter part 11b of the cylindrical part 11, while the outer ring 4b is controlled by positioning of the inner ring 4a. The position in the axial direction is naturally set by press-fitting into the insert 6.

  A pair of first and second seal members 17 and 18 are provided at the front and rear ends of the ball bearing 4 in the axial direction, as shown in FIGS. The both seal members 17 and 18 are arranged to face each other so as to cover both sides of the ball bearing 4 in the axial direction.

  The first seal member 17 is fixed in a sandwiched state between the annular projecting portion 11d on the medium diameter cylindrical portion 11b side and one end surface of the inner ring 4a.

  On the other hand, the second seal member 18 is fixed in a sandwiched state between the second seal member 18 and the other end surface of the inner ring 6a by a retainer 20 as a holding member.

  As shown in FIGS. 1 to 5 and 9, the pulley 5 is integrally formed with the drive shaft 7 by a synthetic resin material mixed with glass fiber, and is arranged on one end side of the drive shaft 7. A disk-shaped end wall (connection wall) 5a, a large-diameter cylindrical portion 5b bent in the axial direction of the drive shaft 7 from the outer peripheral edge of the end wall 5a, and a projecting projecting on the outer peripheral surface of the cylindrical portion 5b Belt mounting portion 5c.

  As shown in FIGS. 1, 2, 4 and 5, the end wall 5a is formed with six working holes 5e extending in the axial direction at substantially equal intervals in the circumferential direction. Reinforcing ribs 19 that are a plurality of convex portions in the radial direction from substantially the center position are integrally provided.

  Further, the end wall 5a is set so that the width area of the outer peripheral surface 5g located on the outer side in the radial direction of each working hole 5e is larger than that of the conventional one.

  As shown in FIG. 5, each of the working holes 5e has a diameter smaller than that of the conventional one, and is arranged close to the center of the end wall 5a, and has a circular locus Q (which connects the outer edges). An alternate long and short dash line is disposed inside the diameter α of the inner peripheral surface 6c of the metal insert, and an annular projection 5f is formed on the outer hole edge.

  Each work hole 5e serves as a work hole into which the press-fitting jig S is inserted when the inner ring 4a of the ball bearing 4 is press-fitted into the outer periphery of the small-diameter part 11c of the cylindrical part 11. In addition, it has a role of discharging water vapor evaporated from the inside of the drain chamber 13 and the like and reaching the inside of the small diameter portion 11c to the outside.

  The protrusion 5f has an effect of suppressing water from entering the work holes 5e.

  In the belt mounting portion 5c, a transmission belt wound around a driving pulley fixed to a tip portion of a crankshaft (not shown) is wound around an outer periphery formed in a cross-sectionally corrugated tooth shape to transmit a rotational force. It is like that.

  As shown in FIGS. 1, 2, 4, and 5, the reinforcing rib 19 includes a protruding portion 19 a formed at a radial center position of the outer surface of the end wall 5 a, and an outer peripheral edge of the protruding portion 19 a. And six extending portions 19b extending in the radial direction.

  Each extending portion 19b is disposed between each working hole 5e, extends radially outward from each corner portion 19c, and has the same length as the outer diameter of the end wall 5a. It is extended radially. A small-diameter projection 21 is integrally provided at the center of the projection 19a. This protrusion 21 is a resin inlet, that is, a gate at the time of injection molding.

  As shown in FIGS. 1, 2, and 4, the metal insert 6 is integrally provided on the inner peripheral side of the cylindrical portion 5 b.

  As shown in FIGS. 1, 4, and 6 to 8, the metal insert 6 includes a cylindrical main body 6 a and a flange portion 6 b that is integrally provided at one axial end of the main body 6 a. At the time of resin molding of the pulley 5, the flange portion 6b is buried in the cylindrical portion 5b and fixed integrally therewith.

  The length of the main body 6a in the axial direction is set to be substantially the same as the length in the axial direction of the cylindrical portion 5b, and the outer ring 4b of the ball bearing 4 is press-fitted and fixed to the inner peripheral surface 6c after molding. It has become so.

  The flange portion 6b is formed such that an end edge of the main body 6a on the end wall 5a side is bent in the radial direction along the inner surface of the end wall 5a, and an outer peripheral edge is formed in a wave shape (unevenness). This wave shape restricts the metal insert 6 from idling on the inner periphery of the cylindrical portion 5b, and also prevents the metal insert 6 from coming out from the inner peripheral surface of the cylindrical portion 5b in the axial direction.

  As shown in FIGS. 1 and 2, the drive shaft 7 is formed in a stepped diameter shape by a synthetic resin material mixed with glass fiber, and is joined to the center of the end wall 5a from the axial direction. 7a, a medium-diameter shaft portion 7b provided on the other end side of the large-diameter shaft portion 7a via a stepped portion 7e, and a small-diameter shaft portion 7c provided at an end portion on the impeller 8 side of the medium-diameter shaft portion 7b. It is composed of

  As shown in FIGS. 1 and 9, the medium-diameter shaft portion 7b is formed with two parallel side surfaces 7d and 7d having a two-sided width at the tip side.

  A storage chamber (not shown) that stores water blocked by the mechanical seal 9 is formed in the lower part of the annular space chamber 16, and the storage chamber is closed by a drain cap 14.

  The impeller 8 is integrally formed of a synthetic resin material. As shown in FIGS. 1 to 3, 9, and 10, the impeller 8 is integrally integrated with the substantially disc-shaped base 8 a and the front side central portion of the base 8 a from the axial direction. A cylindrical shaft portion 8b that protrudes from the shaft 8 and eight blade portions 8c that are formed radially from the outer peripheral surface of the shaft portion 8b.

  The base portion 8a is formed to have a predetermined thickness and rotates with a gap on the rear surface of the pump chamber 3.

  The shaft portion 8b is formed with a protrusion 8d extending from the shaft portion 8b on the back surface, and a fixing hole 8e is formed in the inner axial direction including the protrusion 8d.

  In the fixing hole 8e, two side-width side surfaces 7d, 7d on the front end side of the medium-diameter shaft portion 7b of the drive shaft 7 and a small-diameter shaft portion 7c are inserted and arranged, and the both sides are formed on a part of the insertion side. Opposing surfaces 8g and 8g having a two-sided width with which the surfaces 7d and 7d are fitted are formed, and are prevented from rotating between the both 7d, 7d, 8g and 8g. The distal end of the small diameter shaft portion 7c protrudes from the distal end surface of the shaft portion 8b, and is fixed by press-fitting a push nut 22 into the protruding distal end portion of the small diameter shaft portion 7c.

  Further, as shown in FIGS. 2, 3, 9, and 10, the base 8 a has two pairs from the center of the fixing hole 8 e to the radial center of the outer periphery of the base 8 a from the front to the back. A small-diameter through-hole 8f is formed.

The mechanical seal 9 is a general one, and includes a cartridge portion 9 a fixed to the inner peripheral surface of the medium diameter portion 11 b of the cylindrical portion 11 and a sleeve portion supported on the outer peripheral surface of the drive shaft 7. 9b and a seal portion 9c which is provided between the inner peripheral side of the cartridge portion 9a and the outer peripheral side of the sleeve portion 9b and slides.
[Effects of First Embodiment]
Therefore, according to this embodiment, when the crankshaft of the engine is rotationally driven and the pulley 5 is rotationally driven, the impeller 5 is rotated via the drive shaft 7 integrally formed with the pulley 5. Pumping action, cooling water to the discharge port 1
The entire internal combustion engine is cooled by pumping from 0d to the water jacket of the engine.

  In the present embodiment, each of the working holes 5e has a circular trajectory Q connecting the outer end edges disposed inside the diameter α of the inner peripheral surface 6c of the metal insert 6, and The diameter of the working hole 5e is small.

  As a result, as each work hole 5e is reduced in diameter, water, dust, etc. enter the inner surface side of the end wall 5a from the work hole 5e and flow toward the ball bearing 4. Can be suppressed.

  In addition, since the protrusions 5f formed on the outer edge of each working hole 5e function as a weir, the intrusion of water into each working hole 5e can be further suppressed.

  Furthermore, the entire work hole 5e is arranged close to the center side of the end wall 5a, so that the area of the outer peripheral surface 5g of the end wall 5a can be made larger than that of the prior art and the rigidity of the outer peripheral surface 5g. Will improve. When the outer ring 4b of the ball bearing 4 is press-fitted into the inner peripheral surface 6c of the metal insert 6 from the axial direction, a press-fitting jig is applied to the outer peripheral surface 5g of the end wall 5a, as shown by a one-dot chain line in FIG. S can be brought into contact.

  Further, the body 6a of the metal insert 6 is formed to have substantially the same axial length as the inner peripheral surface of the cylindrical portion 5b, and is disposed so as to contact the inner surface of the end wall 5a. The engine heat generated therein is transmitted from the pump housing 2 and the ball bearing 4.

  Here, the heat transferred to the metal insert 6 becomes a high temperature of around 120 ° C. during normal operation of the engine and 140 ° C. during high load operation. In addition, since the metal insert 6 is fixed to the inner periphery of the cylindrical portion 5b of the synthetic resin pulley 5 that hardly transmits heat, the heat of the metal insert 6 is kept warm by the cylindrical portion 5b. become. Further, since the flange portion 6b of the metal insert 6 is bent in the radial direction along the inner surface of the end wall 5a, heat is easily held in the flange portion 6b, and the heat retaining effect of the metal insert 6 is improved. Can be made.

  Thereby, for example, water enters the inner surface side of the end wall 5 a from each of the working holes 5 e, and is slightly inside, that is, the inner peripheral surface 6 c of the metal insert 6 between the inner surface of the end wall 5 a and the ball bearing 4. Even if it accumulates in a part of the metal, it evaporates due to the heat of the metal insert 6 and is discharged to the outside from the work hole 5e. In particular, the water collected in a part of the inner peripheral surface 6c moves to the flange portion 6b side of the metal insert 6 due to the centrifugal force caused by the rotation of the pulley 5, so that the evaporability is further improved. For this reason, the penetration | invasion to the said ball bearing 4 is lost, and generation | occurrence | production of rust can be suppressed.

  Further, the sleeve portion 9b of the mechanical seal 9 is actively cooled by the cooling water flowing in the direction of the mechanical seal 9 by the two through holes 8f formed in the impeller 8, and the sliding with the drive shaft 7 is performed. The seizure due to dynamic friction can be effectively suppressed.

  Most of the cooling water that has flowed in the direction of the mechanical seal 9 is blocked by the mechanical seal 9 from flowing into the inner diameter portion 11b of the drive shaft 7, but a part of the cooling water is, for example, a slide of the mechanical seal 9. It leaks from the moving seal portion 9c and flows along the outer peripheral surface of the drive shaft 7 toward the medium diameter portion 11b. When the flowing cooling water reaches the stepped portion 7e, it is cut at the outer peripheral edge of the stepped portion 7e with the action of the rotational centrifugal force of the drive shaft 7, and from the drain hole 12 through the annular space chamber 16. It is dropped into the drain chamber 13 and collected and stored individually.

  Further, by arranging the working hole 5e inside the diameter α of the inner peripheral surface 6c of the metal insert 6, the pulley 5 can be formed by injection compression molding which is a kind of injection molding. The strength of the wall 5a can be improved. Injection compression molding is a method in which a mold is injected and filled with a resin, and thereafter, a compression force is applied to perform molding again so as to obtain a molded product having a desired shape.

  In this embodiment, after filling the mold with resin, the movable member for forming the working hole 5e is moved from the metal insert 6 side to form the working hole 5e.

  Usually, when the shape of the working hole 5e is formed by injection filling of resin, since the resin is filled radially from the gate which is the protrusion 21, it flows so as to avoid the working hole 5e, and then merges. For this reason, a boundary (weld) is generated at the junction, and the strength may be reduced.

However, according to this embodiment, the injection compression molding is used, and after the resin is injected and filled, the molding is performed by applying a compression force so as to obtain the shape of the working hole 5e, thereby improving the strength without generating welds. Can be planned.
[Second Embodiment]
FIG. 11 shows a second embodiment in which the center of the flange portion 6b of the metal insert 6 is formed eccentric from the center of the cylindrical portion 5b.

  Therefore, by arranging the flange portion 6b of the metal insert 6 eccentrically, the insert 6 is prevented from idling on the inner periphery of the cylindrical portion 5b as in the first embodiment, and the cylindrical portion 5b. Can be prevented from exiting from the inner circumference of the.

In addition, since the other configuration is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.
[Third Embodiment]
FIG. 12 shows a third embodiment, in which the flange portion 6b of the metal insert 6 is changed to an elliptical shape.

  Therefore, by forming the flange portion 6b of the metal member 6 in an elliptical shape, the insert 6 is prevented from idling on the inner periphery of the cylindrical portion 5b as in the first embodiment, and the cylinder The escape from the inner periphery of the portion 5b can be suppressed.

In addition, since the other configuration is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.
[Fourth Embodiment]
FIG. 13 shows a fourth embodiment in which grooves are cut out at equal intervals along the axial direction on the outer periphery of the flange portion 6 b of the metal insert 6.

  Therefore, by forming grooves at equal intervals along the outer peripheral axis direction of the flange portion 6b of the metal insert 6, the insert 6 idles on the inner periphery of the cylindrical portion 5b as in the first embodiment. And can be prevented from coming out from the inner periphery of the cylindrical portion 5b.

In addition, since the other configuration is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.
[Fifth Embodiment]
FIG. 14 shows a fifth embodiment in which the flange portion 6b of the metal insert 6 is changed to a polygonal shape.

  Therefore, by forming the flange portion 6b of the metal insert 6 in a polygonal shape, the insert 6 is prevented from idling on the inner periphery of the cylindrical portion 5b as in the first embodiment, and the cylinder The escape from the inner periphery of the portion 5b can be suppressed.

  In this embodiment, an octagon is used, but a pentagon may be used if it is a polygon.

Since the other configuration is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.
[Sixth Embodiment]
FIG. 15 shows a sixth embodiment in which the flange portion 6b of the metal insert 6 is changed into a concentric shape.

  Therefore, by forming the flange portion 6b of the metal insert 6 on a concentric circle, the insert 6 can be prevented from coming out from the inner periphery of the cylindrical portion 5b.

  In addition, since the other configuration is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.

  The present invention is not limited to the configuration of each of the embodiments described above, and the configuration can be changed without departing from the spirit of the invention.

The technical ideas of the invention other than the claims ascertained from the embodiment will be described below.
[Claim a] In the water pump according to claim 1,
A water pump comprising a seal member provided on one or both sides in the axial direction of the bearing so as to cover the bearing and having an elastic portion that contacts an outer ring of the bearing.

According to the present invention, even if water penetrates from each of the working holes, most of the water is evaporated and dried by heat as described above, but the other part also penetrates the bearing by the seal member. Can be prevented.
[Claim b] In the water pump according to claim a,
The water pump according to claim 1, wherein the seal member is fixed between the bearing and the holding member by a holding member fixed to the housing.

According to this invention, the sealing member can be firmly fixed by the holding member.
[Claim c] In the water pump according to claim 1,
A water pump, wherein a protrusion is provided along an outer edge of the working hole.

According to this invention, it is possible to suppress water from entering the working hole due to the damming effect of the protrusions.
[Claim d] In the water pump according to claim 1,
The water pump according to claim 1, further comprising a mechanical seal that seals between the housing and the drive shaft.
The metal member has a main body whose outer periphery is held by the cylindrical portion, and a flange portion which is bent on the end wall side of the main body and radially outward, and the flange portion is buried in the cylindrical portion. A water pump characterized by
[Claim f] In the water pump according to claim e,
The flange part of the said metal member is a water pump characterized by the outer peripheral surface being formed in uneven | corrugated shape.

According to this invention, it is possible to suppress slipping of the metal member and escape from the inner periphery of the cylindrical portion due to the uneven shape.
[Claim g] In the water pump according to claim e,
An axial impeller side end surface of the metal member main body is formed to be flush with an axial impeller side end surface of the cylindrical portion.
(Claim h) In the water pump according to claim 1,
The outer surface of the end wall is provided with radial reinforcing ribs.

  According to this invention, the strength of the end wall can be increased by the reinforcing ribs, and water and dust can be prevented from entering the working hole.

DESCRIPTION OF SYMBOLS 1 ... Water pump 2 ... Pump housing 3 ... Pump chamber 4 ... Ball bearing (bearing)
5 ... pulley 5a ... end wall (connection wall)
5b ... Cylindrical part 5e ... Working hole (hole)
5f ... Projection 6 ... Metal insert (metal member)
6a ... main body 6b ... flange portion 7 ... drive shaft 8 ... impeller 9 ... mechanical seal 10 ... housing main body 11 ... cylindrical portion 17 ... first seal member (seal member)
18 ... Second seal member (seal member)
19 ... Reinforcing rib 20 ... Retainer (holding member)
Q ... locus S ... press fitting jig

Claims (2)

A pump housing having a pump chamber therein;
A drive shaft rotatably supported in the pump housing;
A pulley integrally coupled to one end of the drive shaft via an end wall, and formed integrally with the drive shaft by a synthetic resin material;
A cylindrical metal member fixed to the inner periphery of the cylindrical portion integrally formed on the outer periphery of the end wall of the pulley;
A bearing interposed between the metal member and the pump housing to rotatably support the drive shaft;
An impeller that is housed in the pump chamber and provided integrally with the other end of the drive shaft;
With
A plurality of holes are formed in the end wall so as to penetrate along the axial direction, the holes are disposed on the inner side of the inner peripheral surface of the metal insert, and a part of the metal insert is disposed on the inner surface of the end wall. And a water pump interposed between the bearing end surface facing the inner surface. A pump housing having a pump chamber therein;
A drive shaft rotatably supported in the pump housing;
A pulley integrally coupled to one end of the drive shaft via a connecting wall, and formed integrally with the drive shaft by a synthetic resin material;
A cylindrical metal member fixed to a disk-shaped inner periphery integrally formed on the outer periphery of the connecting wall of the pulley;
A bearing interposed between the metal member and the pump housing to rotatably support the drive shaft;
And an impeller that is housed in the pump chamber and provided so as to be integrally rotatable at the other end of the drive shaft,
At least one hole is provided on the inner peripheral side of the metal member of the connecting wall, and a part of the metal member in the axial direction is provided so as to face between the connecting wall and the bearing, and the metal member A water pump characterized in that a flange portion extending outward in the diametrical direction is provided at an end portion on the connecting wall side.

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