JP2004124714A - Water pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water pump, in which interference of a bolt fastening tool with a pulley in fixing a water pump to a fixed member is prevented and thereby a degree of freedom of bolt arrangement is increased. <P>SOLUTION: A plurality of female screw parts 12d are arranged on a pulley member 20 side of a body 12. The female screw parts 12d are fastened from an engine cylinder block 90 side by bolts 13 for fixing a body 12 with the engine cylinder block 90. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water pump, and more particularly to a water pump for an automobile.
[0002]
[Prior art]
2. Description of the Related Art A conventional water pump is disclosed in, for example, JP-A-2002-89486. The water pump includes a pulley, a shaft rotating integrally with the pulley, an impeller rotating integrally with the shaft, a body having the impeller disposed at one end thereof, and a body disposed between the body and the pulley. The bearing comprises a bearing for rotatably supporting the pulley, and a mechanical seal for sealing between the impeller and the bearing. The body is fixed to the fixing member by a bolt via a gasket.
[0003]
2. Description of the Related Art In recent years, a water pump for cooling an engine of an automobile has been considered in which a pulley, a shaft, and the like are integrally formed of an iron plate material or a resin due to needs for cost reduction and weight reduction of parts.
[0004]
However, in the case of this water pump, since the pulley and the shaft are integrated, when mounting the water pump to the engine, it is necessary to determine the mounting hole position of the body so that the bolting tool does not interfere with the pulley. For this reason, the size of the body is increased, and there have been problems such as deterioration of productivity of the body and increase in cost.
[0005]
[Patent Document 1]
JP 2002-89486 A
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and provides a water pump in which a bolt tightening tool and a pulley do not interfere with each other when a water pump is fixed to a fixing member, thereby increasing the degree of freedom in bolt arrangement. This is a technical issue.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned technical problem, the technical means taken in the invention of claim 1 has a pulley portion rotated by a winding and a winding conductive member, and has a coaxial center at the center of the pulley portion. A pulley member provided with a shaft portion, a bearing provided between the body and the pulley member to rotatably support the pulley member with respect to the body, an impeller fixed to the shaft portion, In a water pump including a mechanical seal that liquid-tightly seals between the impeller and the bearing, and a fixing member that fixes the body via a gasket, a bolt that fixes the body and the fixing member includes a bolt. A plurality of female screw portions tightened from a fixed member side are provided on the pulley member side of the body.
[0008]
According to this means, by arranging the female screw portion on the pulley member side of the body, a bolt for fixing the body and the fixing member can be tightened from the fixing member side. Can be avoided.
[0009]
According to a second aspect of the present invention, in order to solve the above-described technical problem, the female screw portion includes a nut in addition to the first aspect of the present invention. Thereby, the female screw portion can be formed as a separate member, and the selection range of the material of the female screw portion can be expanded.
[0010]
According to a third aspect of the present invention, in order to solve the above technical problem, in addition to the second aspect, the nut is welded and fixed to the body. Thereby, the water pump can be easily attached to the fixing member.
[0011]
According to a fourth aspect of the present invention, in order to solve the above technical problem, in addition to the first aspect, the female screw portion is formed by performing a burring process on the body. It is. Thereby, the female screw portion can be formed integrally with the body.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIG.
[0013]
In FIG. 1, a body 12 of a water pump 10 is fixed to an engine cylinder block (fixing member) 90 by bolts (fastening means) 13 via a gasket 80 or the like. The body 12 has a stepped cylindrical portion having a large diameter portion 12a and a small diameter portion 12b. The inner race of the bearing 14 is press-fitted and fixed to the outer peripheral surface of the small diameter portion 12b of the cylindrical portion. Note that the fixing member may be a timing chain case or the like.
[0014]
Further, the body 12 is provided with a plurality of (four in this embodiment, four) female screw portions 12d of nuts 14 to which bolts 13 for fixing the body 12 and the engine cylinder block 90 are tightened from the engine cylinder block 90 side. Is disposed on the pulley member 20 side. Therefore, when the body 12 is fixed to the engine cylinder block 90, the bolts 13 are tightened from the engine cylinder block 90 side. Thus, interference between the bolt tightening tool (not shown) and the pulley portion 18 can be avoided. Note that the nut 14 may be fixed to the body 12 by welding. Thus, the water pump 10 can be easily assembled to the engine cylinder block 90.
[0015]
The outer peripheral portion 17 a of the arm portion 17 of the shaft portion 25 is press-fitted into the outer peripheral surface of the outer race of the bearing 14. A pulley portion 18 is integrally formed outside the outer peripheral portion 17a. A belt (wrapping conductive member) 85 is wound around the outer periphery of the pulley portion 18. The pulley member 20 is constituted by the shaft portion 25 and the pulley portion 18. Note that the pulley member 20 may be formed by resin molding or the like in addition to press molding.
[0016]
The arm portion 17 of the shaft portion 25 has a cylindrical shape with a bottom, and openings 17c for discharging water droplets leaking from the mechanical seal 50 to the outside are formed in the bottom portion 17b at equal angular intervals. A bottom wall is formed at the end of the shaft portion 25 and is closed.
[0017]
An impeller 30 is fitted to the right end of the shaft portion 25 so as to be integrally rotatable. The impeller 30 is integrally formed with a base 30a, a plurality of blades 30b protruding from a peripheral edge on the right side of the base 30a, and a cylindrical hollow protrusion 30c into which the shaft 25 is fitted at the center of the base 30a. The impeller 30 may be processed by resin molding or other molding methods. The impeller 30 is provided in a water chamber 95 formed inside the engine cylinder block 90 and the like and having an opening closed by the body 12. The water chamber 95 is a component of an engine cooling water circuit (not shown).
[0018]
One end of a cylindrical space 27 defined between the outer peripheral surface of the shaft portion 25 and the inner peripheral surfaces of the large-diameter portion 12a and the small-diameter portion 12b of the body 12 (a boundary portion with the water chamber 95) is provided with a mechanical member. A seal 50 is provided to watertightly separate the outside and the water chamber 95 so that the cooling water does not leak outside. The mechanical seal 50 is fixed to the fixed ring 50a fixed to the inner peripheral side of the large-diameter portion 12a of the cylindrical portion of the body 12, and is fixed to the shaft portion 25. And a rotating ring 50b that comes into contact with the motor.
[0019]
Next, the operation of the water pump 10 of the present embodiment will be described.
[0020]
The pulley 18 is rotated by a torque transmitted from an output shaft (not shown) of the engine via the belt 85 engaged with the outer periphery of the pulley 18. As the pulley 18 rotates, the shaft 25 integrally formed with the arm 17 fixed to the inner periphery of the pulley 18 also rotates in the same direction. Then, the impeller 30 integrated with the shaft portion 25 rotates in the water chamber 95 closed by the body 12.
[0021]
Now, since the water chamber 95 is filled with the cooling water, the impeller 30 conveys the cooling water near the center of the water chamber 95 toward the outer periphery of the impeller 30 by the centrifugal force generated by the rotation of the impeller 30. . In this way, a centrifugal pump action occurs from the center of the impeller 30 to the outside. As a result, a pressure difference is generated between the vicinity of the rotation center of the impeller 30 and the outer peripheral side in the water chamber 95, and the cooling water flows from the suction port 95a provided near the rotation center of the impeller 30 into the water chamber 95. Inhaled. Then, the water is pressure-fed to the outer peripheral side by the pump action of the impeller 30 and supplied to each part to be cooled of the engine from a discharge port (not shown) provided on the outer peripheral side, and the cooling water circulates.
[0022]
FIG. 3 shows a plurality of female screw portions 12d for fixing the body 12 and the engine cylinder block 90 of the water pump 10 of the second embodiment to which the present invention is applied, formed on the pulley member 20 side of the body 12 by burring. The body 12 having the portion 12c is shown. Note that the second embodiment differs from the first embodiment only in the screw portion 12c of the body 12, and a description of the same configuration as the first embodiment will be omitted.
[0023]
The screw portion 12c can be formed integrally with the body 12, and the size of the body 12 can be reduced.
[0024]
【The invention's effect】
As described above, according to the technical measures taken in the first aspect of the present invention, the female screw portion is arranged on the pulley member side of the body, so that the bolt for fixing the body and the fixing member is fixed to the fixing member side. , It is possible to avoid interference between the bolting tool and the pulley.
[0025]
Further, according to the technical means adopted in the invention of claim 2, the female screw portion can be formed as a separate member, and the selection range of the material of the female screw portion can be expanded.
[0026]
According to the technical measures taken in the third aspect of the present invention, the water pump can be easily attached to the fixing member.
[0027]
Further, according to the technical measures taken in the invention of claim 4, the female screw portion can be formed integrally with the body, and the female screw portion can be formed at the time of molding the body.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a water pump according to a first embodiment of the present invention.
FIG. 2 is a front view of a water pump according to the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a screw portion of the water pump according to the second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 10 ... Water pump 12 ... Body 13 ... Bolt 14 ... Bearing 18 ... Pulley part 20 ... Pulley member 25 ... Shaft part 30 ... Impeller 50 ... Mechanical seal 80 ... gasket 85 ... belt (wrapping conductive member)

Claims (4)

With both sides,
A pulley member that has a pulley portion that is rotated by the winding conduction member, and that has a shaft portion that is provided coaxially at the center of the pulley portion,
A bearing that is provided between the body and the pulley member and rotatably supports the pulley member with respect to the body;
An impeller fixed to the shaft portion;
A mechanical seal for liquid-tightly sealing between the impeller and the bearing;
A water pump comprising a fixing member for fixing the body via a gasket,
A water pump, wherein a plurality of female screw portions to which bolts for fixing the body and the fixing member are tightened from the fixing member side are disposed on the pulley member side of the body. The water pump according to claim 1, wherein the female screw portion is formed of a nut. The water pump according to claim 2, wherein the nut is fixed to the body by welding. The water pump according to claim 1, wherein the female screw portion is formed by performing burring on the body.

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