JP2002155893A - Water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a drawing ability of a shaft part of a pulley member and to reduce a shaft length. SOLUTION: This water pump comprises: a body 2; the pulley member 4; a bearing 6 allowing the pulley member 4 to rotate; and a rotating blade member 8. The pulley member 4 has a pulley part 40 rotated by a wound conduction member; and the cylindrical shaft part 50 penetrated in the shaft length direction. The shaft part 50 is substantially concentrically arranged in a center region of the pulley part 40 by drawing, and comprises: a shaft hollow chamber 51; an end opening 52 arranged at a tip end side of the shaft hollow chamber 51; and a base end opening 52 arranged at a base end of the shaft hollow chamber 51. A central boss part 80 of the rotating blade member 8 is fitted inside the shaft hollow chamber 51 of the shaft part 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pump for supplying water.

[0002]

2. Description of the Related Art A water pump for cooling an internal combustion engine of a vehicle will be described as an example. This water pump is shown in FIG.
As shown in the figure, a body 2A fixed to a mounting surface of a cylinder block of an internal combustion engine, a pulley 40A rotated by a winding conduction member, and a solid state coaxially connected to a central region of the pulley 40A. Shaft 50A and body 2A
A bearing 6A is provided between the shaft member 50A and the pulley portion 40A so as to rotate the pulley portion 40A with respect to the body 2A, and a rotating blade member 8A fitted and fixed to the shaft portion 50A. When the crankshaft of the internal combustion engine is driven, a belt 49A, which is a wrapping conductive member provided between the crankshaft and the pulley portion 40A, circulates, whereby the pulley portion 40A rotates. When the pulley portion 40A rotates, the shaft portion 5 connected to the pulley portion 40A
0A rotates in the same direction, and the rotary blade member 8A rotates in the pump chamber of the internal combustion engine. As a result, a pump action is exhibited. This type of water pump is disclosed in Japanese Patent Application Laid-Open No. Hei 4-26209.
No. 6, for example.

[0003]

According to the water pump shown in FIG. 4, the solid shaft portion 50A and the pulley portion 40A projecting toward the pump chamber 11A are separate from each other. And the solid shaft portion 50A are connected one by one, so that it is not always satisfactory in terms of weight reduction and assemblability.
In order to solve such a problem, it is conceivable to employ a pulley member in which the pulley portion 40A and the hollow shaft portion 50A with a bottom are formed by press molding from a single plate (not known at the time of filing the present application). .

[0004] In this way, the number of parts and the weight can be reduced. This shaft portion can be formed by drawing, and the tip of the shaft hollow chamber along the axial length direction is closed by a bottom wall portion. When forming a hollow shaft with a bottom having a bottom wall that closes the hollow shaft by drawing, the thickness of the peripheral wall of the shaft having the hollow with a bottom may be reduced when drawing conditions are severe. There is a limit to making the thickness uniform with high precision. The present invention has been made in view of the above circumstances, and a water pump that can secure drawability of a shaft portion integrally formed with a pulley portion of a pulley member and is advantageous in shortening the length of the shaft portion. Is the task to be solved.

[0005]

SUMMARY OF THE INVENTION A water pump according to the present invention has a body and a pulley portion rotated by a winding conduction member, and is provided substantially coaxially by drawing in a central region of the pulley portion. A pulley member having a cylindrical hollow shaft portion penetrating in the axial direction having a shaft hollow chamber, a distal opening located on the distal side of the shaft hollow chamber, and a proximal opening located on the proximal side of the shaft hollow chamber. A water pump including a bearing provided between the body and the pulley member and configured to rotate the pulley member with respect to the body, and a rotating blade member fixed to a shaft portion of the pulley member and performing a pump function. The rotating blade member has a central boss portion and a blade, and the central boss portion is fitted inside the shaft hollow chamber of the shaft portion of the pulley member. That.

According to the water pump of the present invention, the pulley member has a pulley portion rotated by a winding conduction member such as a belt, and a shaft portion integral with the pulley portion. The shaft portion is provided substantially in the central region of the pulley portion by coaxial drawing. This shaft part
A shaft hollow chamber that has a cylindrical shape penetrating in the axial direction and extends in the axial direction, a distal opening located on the distal side of the shaft hollow chamber, and a proximal opening located on the proximal side of the shaft hollow chamber. With. As described above, since the shaft portion has a cylindrical shape penetrating in the axial direction of the shaft portion and has a non-bottomed hollow shape having no bottom wall portion, the shaft portion has a bottomed hollow shape having a bottom wall portion. As compared with the above, the drawability of the peripheral wall of the shaft portion is better ensured.

Further, since the central boss of the rotary blade member is fitted inside the shaft hollow chamber of the shaft portion of the pulley member, the central boss portion of the rotary blade member is fitted outside the shaft portion of the pulley member. As compared with the case where the shaft portion is protruded toward the rotary blade member in the axial direction of the shaft portion, the degree of protrusion is reduced, which is advantageous for shortening the shaft length of the shaft portion. Good drawability of the shaft portion is ensured.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a water pump according to the present invention, at least one of the following embodiments can be adopted. The rotating blade member has a bottomed hollow central boss having a closed wall, and a blade protruding in a direction opposite to the center boss in the axial direction of the shaft portion. The central boss portion is fitted inside the shaft hollow chamber of the shaft portion, and the shaft hollow chamber of the shaft portion can be closed in a non-communicating state by the closing wall of the central boss portion. Since the shaft hollow chamber of the shaft portion is closed by the closing wall in a non-communicating state, water leakage to the shaft hollow chamber can be prevented. Since the central boss projecting in the direction opposite to the blade is fitted inside the shaft, it is advantageous for shortening the axial length of the shaft. The body may adopt a form formed by press-forming or rolling-forming a metal plate. The body can adopt a form having a drain chamber for storing water leaking from the pump chamber. At least one of the body and the pulley portion may have a bent portion that is applied to the bearing to increase the holding performance of the bearing. Therefore, a form in which the body has a curved portion can be adopted. Further, a form in which the pulley portion has a curved portion can be adopted. Providing the bent portion that can function as a stopper in this way improves the bearing resistance of the bearing. -The form which interposes an insertion member between at least one of a body and a pulley part and a bearing can be employ | adopted. Therefore, a mode in which the insertion member is interposed between the body and the bearing can be adopted. Further, a mode in which an insertion member is interposed between the pulley portion and the bearing can be adopted. It is advantageous to adjust the size of the body, the pulley, and the bearing by the insertion member. The body and the insertion member may be connected by a welded portion, may be connected by a caulked portion, or may be connected by a press-fitting structure. The pulley portion and the insertion member may be connected by a welding portion, may be connected by a caulking portion, or may be connected by a press-fitting structure. The insert may be rigid. If the insertion member has high rigidity, the rigidity of the body and the pulley portion can be supplemented, which is advantageous for improving the mounting strength of the water pump. In order to increase rigidity, the thickness of the insertion member can be made larger than the thickness of the body and the thickness of the pulley portion. However, the thickness is not limited to this, and may be approximately the same as the thickness of the body and the thickness of the pulley portion, or may be thin. The insertion member may have a cylindrical shape coaxial with the shaft portion, but is not limited thereto, and may have a plate shape. The shaft portion may be a hollow cylindrical shape having a diameter substantially equal over the axial length. Further, the shaft portion may have a hollow cylindrical shape with a plurality of steps having a plurality of diameters varying over the axial length. When the shaft portion has a cylindrical hollow shape with a plurality of steps, the diameter of the shaft portion can be reduced stepwise so as to gradually decrease toward the tip, so that the drawability of the shaft portion is further improved. . In this case,
It may be a two-stage type having two kinds of inner diameters, a three-stage type having three kinds of inner diameters, or a four-stage type having four kinds of inner diameters. It is possible to adopt a structure in which the diameter (inner diameter, outer diameter) of the shaft part is increased as the distance from the internal combustion engine increases in the axial direction of the shaft part. The body may be configured to face the inner peripheral surface of the bearing, or may be configured to face the outer peripheral surface of the bearing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be specifically described below with reference to FIG.

In a cylinder block 10 constituting the internal combustion engine 1 which is a base to which the water pump is mounted, a pump chamber 11 communicating with a cooling water passage is formed so as to open at a mounting surface 13. In FIG. 1, an arrow X1 direction indicates a direction from the outside toward the inside of the cylinder block 10 of the internal combustion engine 1 in the axial direction of the shaft portion 50. The arrow X2 direction indicates a direction from the inside of the cylinder block 10 of the internal combustion engine 1 to the outside in the axial length direction of the shaft portion 50. The water pump is fixed to the mounting surface 13 of the cylinder block 10 and has a body 2, a pulley member 4, a bearing 6, and a rotary blade member 8. Body 2
Is fixed to the mounting surface 13 of the cylinder block 10 constituting the internal combustion engine 1 by a bolt (not shown) passing through the mounting hole 2x. The body 2 is formed by pressing or rolling a single metal plate (generally a steel). The body 2 has a mounting flange portion 20 applied to the mounting surface 13 of the cylinder block 10 via a ring-shaped seal portion 14, and a tubular portion 21 formed in a central region of the mounting flange portion 20. Cylindrical part 21
Has a stepped hollow cylindrical shape, a first cylindrical portion 22 extending in the axial direction, and a second cylindrical portion having a diameter set smaller than the diameter of the first cylindrical portion 22 and extending in the axial direction. 23, a third cylindrical portion 24 having a diameter set to be smaller than the diameter of the second cylindrical portion 23 and extending along the axial direction, and a direction perpendicular to the axis connecting the first cylindrical portion 22 and the second cylindrical portion 23. Along the first vertical wall portion 25 and the second cylindrical portion 23 in the direction perpendicular to the axis connecting the second tubular portion 23 and the third tubular portion 24.
And an upright wall portion 26.

The pulley member 4 is made of metal, and
And a hollow cylindrical shaft portion 50 that penetrates in the axial direction and has a pulley portion 40 that is rotated by a belt 49 as a winding conduction member that is circulated by the crankshaft. Pulley part 40 and shaft part 50
Is formed from a single metal plate. The pulley portion 40 has an outer ring portion 41 along the axial length direction and a standing wall portion 42 along the direction perpendicular to the axis,
It is formed by press molding. The shaft portion 50 is formed into a hollow cylindrical shape by drawing, and is formed substantially coaxially with the pulley portion 40 so as to be continuous from the inner peripheral side of the standing wall portion 42 of the pulley portion 40 in the central region of the pulley portion 40. Have been. The shaft portion 50 includes a shaft hollow chamber 51 extending in an axial length direction defined by a peripheral wall, and a distal end side of the shaft hollow chamber 51 (the cylinder block 10 of the internal combustion engine 1).
Side) and a base opening 53 located on the base end side of the shaft hollow chamber 51 (the side opposite to the cylinder block 10 of the internal combustion engine 1). Shaft part 50
Has a hollow cylindrical shape with a circular cross section, and is lighter. Therefore, the diameter of the shaft portion 50 is substantially constant along the axial length direction, but is not limited thereto. In the present embodiment, as shown in FIG. 1, the tip 50 p of the shaft portion 50 extends in the direction of the arrow X1 along the axial direction thereof, but has not reached the pump chamber 11 of the cylinder block 10 of the internal combustion engine 1. And has not yet reached the mounting surface 13 of the cylinder block 10. However, it is not limited to this.

The bearing 6 enables the pulley member 4 to rotate with respect to the body 2, and includes a ring-shaped outer ring 60,
It has a ring-shaped inner ring 61 and a plurality of rolling elements 62 interposed therebetween. The bearing 6 includes the body 2 and the pulley member 4
And is held between. Specifically, the bearing 6 is provided between the outer peripheral surface of the third cylindrical portion 24 having a small diameter in the cylindrical portion 21 of the body 2 and the inner peripheral surface of the outer ring portion 41 of the pulley portion 40. I have. Therefore, the inner peripheral surface of the bearing 6 is
The outer peripheral surface of the bearing 6 is held by the outer ring portion 41 of the pulley portion 40. As described above, since the bearing 6 is held by using the third cylindrical portion 24 having the smallest diameter among the cylindrical portions 21 of the body 2, it is possible to cope with a reduction in the diameter of the bearing 6.

In this embodiment, the third cylindrical portion 24 of the body 2 and the inner peripheral surface of the bearing 6 are press-fitted and fixed. The outer ring portion 41 of the pulley portion 40 of the pulley member 4 and the outer peripheral surface of the bearing 6 are press-fitted and fixed. By press-fitting and fixing, the holding performance with respect to the bearing 6 is ensured, and the bearing 6 has improved withdrawal resistance. Further, the second upright wall portion 26 of the cylindrical portion 21 of the body 2 is applied as a stopper to the shaft end 6a of the bearing 6 (on the side facing the cylinder block 10 of the internal combustion engine 1), so that the holding property for the bearing 6 is further ensured. As a result, the pull-out resistance of the bearing 6 is further improved.

The rotary blade member 8 is formed by press molding, is made of metal, and has a central boss portion 8 formed by drawing.
0 and a plurality of blades 86 integrally held by the central boss 80. The central boss 80 is the shaft 50
Are located on the opposite side of the blade 86 in the axial direction of the blade. The central boss portion 80 of the rotary blade member 8 has a hollow shape with a bottom, and includes a pipe body 82 having a hollow chamber 81 and a pipe body 82.
Has a closing wall 83 for closing the distal end side of the hollow chamber 81. The central boss 80 provided on the opposite side of the rotary blade member 8 from the blade 86 is connected to the shaft portion 5 of the pulley member 4.
No. 0 is press-fitted and fixed inside the shaft hollow chamber 51.
In other words, the outer wall surface of the pipe pair 82 of the central boss portion 80 of the rotary blade member 8 is pressed against the inner wall surface of the shaft portion 50 of the pulley member 4 that defines the shaft hollow chamber 51.
As shown in FIG. 1, the closing wall 83 of the central boss portion 80 of the rotary blade member 8 enters the shaft hollow chamber 51 in a state where the shaft portion 50 of the pulley member 4 penetrates, and closes the shaft hollow chamber 51. However, the inside of the shaft hollow chamber 51 is kept in a non-communicating state, so that water in the pump chamber 11 of the cylinder block 10 is prevented from leaking into the shaft hollow chamber 51 of the shaft section 50. The hollow chamber 81 of the pipe body 82 of the rotary vane member 8 directly faces the pump chamber 11 of the cylinder block 10. This is advantageous for increasing the volume of the pump chamber 11.

The shaft portion 50 of the pulley member 4 and the body 2
Between them, a sealing means 9 is provided using press-fitting. The sealing means 9 includes a ring-shaped sealing plate 90 provided between the second cylindrical portion 23 of the body 2 and the shaft portion 50 to seal the pump chamber 11, and a known mechanical seal 91. The sealing means 9 prevents the water in the pump chamber 11 of the cylinder block 10 from leaking to the bearing 6 side.

As shown in FIG. 1, since the peripheral wall of the shaft 50 and the peripheral wall of the pipe body 82 of the rotary blade member 8 have a double wall structure, the shaft 5 provided with the sealing means 9 is provided.
It is also advantageous for enhancing 0. The cylindrical portion 2 of the body 2
A ring-shaped gap 29 is formed between the first third cylindrical portion 24 and the shaft portion 50. Since the gap 29 is covered by the pulley portion 40, it cannot be visually recognized from the outside.

In use, an endless belt 49, which is a winding conductive member, is bridged between the crankshaft of the internal combustion engine 1 and the outer ring portion 41 of the pulley portion 40 of the pulley member 4. When the internal combustion engine 1 is driven to drive its crankshaft and the belt 49 circulates, the pulley member 4 including the pulley portion 40 and the shaft portion 50 rotates integrally. Therefore, the blades 86 of the rotary blade member 8 connected to the shaft portion 50 rotate in the same direction in the pump chamber 11 of the internal combustion engine 1, and the water in the pump chamber 11 is sent in the centrifugal direction, and the pump action by the blades 86 is performed. Is exerted, and the cooling water circulates in a water passage (not shown) of the cylinder block 10.

As described above, according to this embodiment, the pulley member 4 is rotated by the belt 49.
0 and a shaft portion 50 integrated with the pulley portion 40,
The shaft portion 50 has a hollow cylindrical shape penetrating in the axial direction, and includes a shaft hollow chamber 51 and a shaft hollow chamber 5.
1 and a proximal end opening 53 located on the proximal end side of the shaft hollow chamber 51. As described above, the shaft portion 50 has a hollow cylindrical shape penetrating in the axial length direction thereof, and is a non-bottomed hollow shape having no bottom wall portion. Compared with a certain case, the drawability (deep drawability) of the shaft portion 50 of the pulley member 4 is improved.

Further, in the present embodiment, the rotary blade member 8
The central boss portion 80 is fitted in the shaft hollow chamber 51 of the shaft portion 50 of the pulley member 4. Therefore, as shown in FIG. 4, unlike the case where the center boss portion of the rotary blade member is fitted to the outside of the shaft portion of the pulley member, the tip 50p in the axial direction of the shaft portion 50 is connected to the rotary blade member 8.
Is reduced. That is, the tip 50p in the axial direction of the shaft portion 50 according to the present embodiment does not have to be excessively protruded toward the pump chamber 11 so as to protrude much into the pump chamber 11 of the cylinder block 10. As described above, in this embodiment, the degree of protrusion of the shaft portion 50 of the pulley member 4 in the axial direction in the axial direction is reduced toward the rotary blade member 8, that is, toward the pump chamber 11. The length can be shortened. Also in this sense, the drawability (deep drawability) of the shaft portion 50 is ensured.

Therefore, in this embodiment, even when the draw forming conditions are severe, the uniformity of the thickness of the peripheral wall of the shaft portion 50 is improved. As a result, even when the pulley member 4 rotates, especially when the pulley member 4 rotates at a high speed, the shaft portion 50 of the pulley member 4 is more advantageous for balancing the rotational balance. If the rotation balance of the shaft portion 50 is further balanced in this way and the axial runout of the shaft portion 50 is further suppressed, it is possible to contribute to further improving the reliability of the sealing means 9 provided near the shaft portion 50, The durability of the bearing 6 that rotatably supports the shaft portion 50 can also be improved. The rotation speed of the pulley member 4 varies depending on the operating condition of the internal combustion engine 1 (at the time of starting or at the time of high-speed operation).
It is in the range of 0-10000 rpm.

Further, in the present embodiment, the shaft length of the shaft portion 50 is reduced as compared with the case where the central boss portion of the rotating blade member is fitted outside the shaft portion of the pulley member as described above. Therefore, the center of gravity of the rotary blade member 8 can be brought closer to the bearing 6 in the axial direction of the shaft portion 50, which is advantageous for smooth rotation of the rotary blade member 8.

Further, according to this embodiment, the shaft end 6a of the bearing 6
The second upright wall portion 26 of the tubular portion 21 of the body 2 is applied as a stopper, so that the holding property to the bearing 6 and the pull-out resistance are secured. Further, as shown in FIG.
0 and the peripheral wall of the pipe body 82 of the rotating blade member 8 are 2
Because of the heavy wall structure, it is also advantageous for strengthening the shaft portion 50. In this case, if work hardening of the drawn peripheral wall of the shaft 50 and the drawn pipe 82 of the rotary blade member 8 can also be expected,
It is more advantageous for strengthening the peripheral wall of the slab.

As described above, according to this embodiment, the shaft portion 50 has a cylindrical shape penetrating in the axial direction thereof and has a non-bottomed hollow shape having no bottom wall portion. Good draw formability. Therefore, even when the axial length of the shaft portion 50 is set to be long, the shaft portion 50
This is advantageous to draw forming without hindrance, and is advantageous in coping with a case where a design structure in which the axial length of the shaft portion 50 is set to be longer due to various circumstances is adopted.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The second embodiment has basically the same configuration as the first embodiment, and has basically the same operation and effect as the first embodiment. Portions common to the first embodiment are denoted by common reference numerals. Hereinafter, the description will focus on different parts. Also in this embodiment, the pulley member 4
Is a pulley part 40 rotated by a belt 49 as a winding conductive member, and a shaft part 50 integrated with the pulley part 40.
And The shaft portion 50 is formed by drawing so as to form a hollow cylindrical shape penetrating in the axial length direction, and includes a shaft hollow chamber 51, a tip opening 52 located on the tip side of the shaft hollow chamber 51, and a shaft hollow chamber. And a base end opening 53 located on the base end side of the base 51. Thus, the shaft portion 5
0 has a cylindrical shape penetrating in the axial direction thereof,
Since it is a non-bottomed hollow shape having no bottom wall, drawability (deep drawability) of the shaft portion 50 of the pulley member 4 is ensured.

In this embodiment, the rotating blade member 8 is also provided.
The central boss 80 of the rotary blade member 8 is fitted into the shaft hollow chamber 51 of the shaft 50 of the pulley member 4.
Compared to the case where the shaft portion 5 is fitted to the outside of the
The axial length of 0 can be shortened. Also in this sense, the drawability (deep drawability) of the shaft portion 50 is ensured. That is, unlike the case where the central boss portion of the rotary blade member is fitted to the outside of the shaft portion of the pulley member as shown in FIG. The degree of protrusion toward the member 8, that is, the side toward the pump chamber 11, is reduced, and the tip 50 p in the axial direction of the shaft portion 50 protrudes excessively toward the pump chamber 11 so as to protrude into the pump chamber 11 in a large amount. You don't have to.

Therefore, in the present embodiment, even when the draw forming conditions are severe, the thickness of the peripheral wall of the shaft portion 50 formed by the draw forming can be made more uniform. As a result, even when the pulley member 4 rotates, especially when rotating at high speed, the shaft portion 5 of the pulley member 4
At 0, the balance of the rotational balance is further improved. If the balance of the rotational balance is further improved and the axial runout of the shaft portion 50 of the pulley member 4 is further suppressed, it is possible to further contribute to further increase the reliability of the sealing means 9 in the vicinity of the shaft portion 50, and the shaft portion 50 The durability of the rotatably supported bearing 6 can be further improved.

The body 2 is formed by pressing or rolling a single metal plate. As shown in FIG. 2, the body 2 includes a mounting flange portion 20 applied to the mounting surface 13 of the cylinder block 10 via a ring-shaped seal portion 14, and a cylindrical shape formed in a central region of the mounting flange portion 20. And a part 21. Cylindrical part 21
Is a first cylindrical portion 22 along the axial direction, a second cylindrical portion 23 having a diameter set smaller than the diameter of the first cylindrical portion 22 and extending along the axial direction, and a second cylindrical portion 23. A third cylindrical portion 24 having a diameter set smaller than the diameter and extending in the axial direction, and a first cylindrical portion extending in a direction perpendicular to the axis connecting the first cylindrical portion 22 and the second cylindrical portion 23.
It has an upright wall portion 25 and a second upright wall portion 26 extending in a direction perpendicular to the axis and connecting the second tubular portion 23 and the third tubular portion 24.

The body 2 is applied as a stopper to the shaft end 6a of the bearing 6 (on the side facing the cylinder block 10 of the internal combustion engine 1) as a first curved portion 3 for improving the holding performance of the bearing 6.
Has 1. The first bent portion 31 is formed by bending the second standing wall portion 26. That is, as shown in FIG.
The second tubular portion 23, the second standing wall portion 26, and the third tubular portion 24 are substantially S-shaped in cross section along the axial direction of the shaft portion 50, and are applied to the shaft end 6a of the bearing 6. The first curved portion 31 is formed.

As shown in FIG. 2, the pulley portion 40 of the pulley member 4 is applied as a stopper to the shaft end 6c of the bearing 6 (the side facing the cylinder block 10 of the internal combustion engine 1) to hold the bearing 6. It has a second musical composition part 32 for improving the performance. Second
The bent portion 32 is formed by bending the upright wall portion 42 of the pulley portion 40. In other words, the upright wall portion 42 of the pulley portion 40 has a substantially C-shaped or V-shaped portion in a cross section along the axial length direction of the shaft portion 50, and is applied to the shaft end 6 c of the bearing 6. The second bent part 32 is formed. Thereby, the pull-out resistance of the bearing 6 is improved.

Further, the third cylindrical portion 2 of the cylindrical portion 21 of the body 2
Between the inner ring 4 and the inner ring 61 of the bearing 6, an inner insertion member 94 having a cylindrical shape is inserted substantially coaxially. A cylindrical outer insertion member 96 is also substantially coaxially inserted between the outer ring portion 41 of the pulley portion 40 and the outer ring 60 of the bearing 6. The insertion of the outer insertion member 96 and the inner insertion member 94 in this manner is advantageous for adjusting the diameters of the bearing 6, the pulley portion 40, and the body 2. Further, since the inner insertion member 94 and the outer insertion member 96 have high rigidity, they are also advantageous in supplementing the rigidity of the outer ring portion 41 of the pulley portion 40 and the rigidity of the third cylindrical portion 24 of the body 2, and The assembling strength of the pump can be improved.

In this embodiment, the interference between the outer insertion member 96 and the bearing 6 is set relatively large, and the interference between the inner insertion member 94 and the bearing 6 is set relatively large.
The interference between the outer insertion member 96 and the outer ring portion 41 of the pulley member 4 is set relatively small, and the interference between the inner insertion member 94 and the body 2 is set relatively small.

In FIG. 2, the direction of arrow X1 indicates the direction from the outside toward the inside of the internal combustion engine 1 in the axial direction of the shaft portion 50, and the direction of arrow X2 indicates the direction of the inside of the internal combustion engine 1 in the axial direction of the shaft portion 50. Indicates the direction away from the outside. The shaft end 96a of the outer insertion member 96 on the internal combustion engine 1 side protrudes from the shaft end 6a of the bearing 6 in the direction of the arrow X1. Shaft end 41a of outer ring 41 of pulley 40
Also protrude in the direction of arrow X1 so as to move away from the bearing 6. Further, as described above, the shaft end 96a of the outer insertion member 96 protruding in the direction of arrow X1 so as to move away from the bearing 6
The shaft end 41 a of the outer ring portion 41 of the pulley portion 40 is connected by a welded portion 95. In this way, the welded portion 95 can be kept away from the bearing 6, which is advantageous for reducing or avoiding the effect of heat on the bearing 6 during welding, and further improving the reliability of the bearing 6. Can contribute to

As shown in FIG. 2, the shaft end 94c of the inner insertion member 94 (the side facing the cylinder block 10 of the internal combustion engine 1) protrudes in a direction away from the bearing 6, that is, in the direction of arrow X2. The shaft end 24c of the third tubular portion 24 of the tubular portion 21 of the body 2 (the cylinder block 10 of the internal combustion engine 1)
Arrow X2 so as to move away from the bearing 6 as well.
Projecting in the direction. As described above, the shaft end 94c of the inner insertion member 94 protruding in the direction of the arrow X2 so as to move away from the bearing 6 and the shaft end 24c of the third tubular portion 24 of the tubular portion 21 of the body 2 are connected by the welded portion 97. Have been. By doing so, the welded portion 97 can be kept away from the bearing 6, which is advantageous for reducing or avoiding the influence of heat on the bearing 6 during welding, and further improving the reliability of the bearing 6. Can contribute.

In recent years, further improvement in the reliability of the belt 49 has been increasingly demanded. Outer ring part 4 of pulley part 40
1 is a belt on which the belt 49 is erected, and if the outer ring portion 41 of the pulley portion 40 is distorted, the belt 49
Is not preferred in terms of further improving the reliability of the device. In this regard, as shown in FIG.
According to this embodiment in which the welding portion 95 is formed at the shaft end 41a protruding in the arrow X1 direction, it is advantageous to suppress the distortion of the outer ring portion 41 of the pulley portion 40 during welding, and The welded portion 95 can be kept as far as possible from the belt 49 provided on the outer peripheral surface of the outer ring portion 41. Therefore, it is possible to prevent the belt 49 from being erected on the heat affected zone, which is advantageous for improving the reliability of the belt 49.
Note that the inner insertion member 94 and the body 2 may be connected to each other or the outer insertion member 96 and the pulley member 4 may be connected to each other by a caulking portion or a bolt instead of the welding portions 95 and 97.

As shown in FIG. 2, the rotary blade member 8 has a central boss 80 formed by deep drawing and a plurality of blades 86 integrally held by the central boss 80. The central boss portion 80 is provided with the blade 8 in the axial direction of the shaft portion 50.
6 is located on the opposite side. The central boss portion 80 of the rotary blade member 8 has a hollow shape with a bottom, and has a pipe body 82 having a hollow chamber 81 and a closing wall 83 for closing the distal end side of the hollow chamber 81 of the pipe body 82. . A central boss portion 80 provided on the rotating blade member 8 on the side opposite to the blade 86
Is the shaft cavity 5 of the shaft portion 50 of the pulley member 4.
1 is press-fitted and fixed inside. In other words, the outer wall surface of the pipe body 82 of the central boss portion 80 of the rotary blade member 8 is pressed against the inner wall surface of the shaft portion 50 of the pulley member 4 that defines the hollow shaft chamber 51. The closing wall 83 of the central boss portion 80 of the rotary blade member 8 closes the shaft hollow chamber 51 in communication with the shaft portion 50 of the pulley member 4 in a non-communicating state. Leakage into the shaft hollow chamber 51 is prevented. The hollow chamber 81 of the pipe body 82 of the rotary blade member 8 is the pump chamber 1
Facing one.

Third Embodiment Hereinafter, a third embodiment of the present invention will be described in detail with reference to FIG. The third embodiment has basically the same configuration as the first embodiment, and has basically the same operation and effect as the first embodiment. Portions common to the first embodiment are denoted by common reference numerals. Hereinafter, the description will focus on different parts. Also in this embodiment, the pulley member 4 has a pulley part 40 rotated by a belt 49 that is a winding conduction member, and a shaft part 50 integrated with the pulley part 40. The shaft portion 50 has a cylindrical shape penetrating in the axial direction, and has a shaft hollow chamber 51, a distal end opening 52 located at a distal end side of the shaft hollow chamber 51, and a proximal end side of the shaft hollow chamber 51. And a proximal opening 53. As described above, the shaft portion 50 has a cylindrical shape penetrating in the axial direction thereof and has a non-bottomed hollow shape without a bottom wall portion. (Deep drawing formability) is ensured.

Further, also in this embodiment, the rotary blade member 8
The central boss 80 of the rotary blade member 8 is fitted into the shaft hollow chamber 51 of the shaft 50 of the pulley member 4.
Compared to the case where the shaft portion 5 is fitted to the outside of the
The axial length of 0 can be shortened. Also in this sense, the drawability (deep drawability) of the shaft portion 50 is ensured. That is, since the center boss 80 of the rotating blade member 8 can be arranged toward the pulley 40, that is, in the direction of the arrow X2 in FIG. 3, the center boss of the rotating blade member as shown in FIG. Is fitted to the outside of the shaft portion of the pulley member, the tip 50p in the axial direction of the shaft portion 50 is connected to the rotating blade member 8 side, that is, the pump chamber 11
Of the shaft portion 50 is reduced.
The tip 50p in the axial direction may not be excessively projected into the pump chamber 11.

Therefore, even when the drawing conditions are severe, unevenness in the thickness of the peripheral wall of the shaft portion 50 formed by drawing can be suppressed. As a result, the pulley member 4
Is rotated, especially when the pulley member 4 rotates at a high speed.
The rotation balance of the shaft portion can be further balanced, and the reliability of the mechanical seal near the shaft portion 50 can be further improved, and the durability of the bearing 6 that rotatably supports the shaft portion 50 can be further improved. Can also be planned.

The body 2 is formed by pressing or rolling a single metal plate. The body 2 has a mounting flange portion 20 applied to the mounting surface 13 of the cylinder block 10 via a ring-shaped seal portion 14, and a tubular portion 21 formed in a central region of the mounting flange portion 20. The cylindrical portion 21 has a stepped cylindrical shape, and has a first cylindrical portion 22 extending in the axial direction and a first cylindrical portion 22 having a diameter set to be larger than the diameter of the first cylindrical portion 22 and extending in the axial direction. A second cylindrical portion 23, a third cylindrical portion 24 having a diameter set smaller than the diameter of the second cylindrical portion 23 and extending along the axial length direction;
A first standing wall portion 25 extending in a direction perpendicular to the axis connecting the first tube portion 22 and the second tube portion 23, and a second standing wall extending in a direction perpendicular to the axis connecting the second tube portion 23 and the third tube portion 24. And a part 26.
The second cylindrical portion 23, the first standing wall portion 25, and the second standing wall portion 26 form a drain chamber 35. Even if the water in the pump chamber 11 has passed through the sealing means 9,
Is stored in the drain chamber 35. The water that has excessively accumulated in the drain chamber 35 is discharged from the drain hole 36 in the second standing wall portion 26 of the body 2.

In this embodiment, as shown in FIG.
The inner peripheral surface of the bearing 6 faces the shaft portion 50, and the outer peripheral surface of the bearing 6 faces the third cylindrical portion 24 of the body 2 via the insertion member 96. The shaft portion 50 of the pulley member 4 has a multi-stage shaft structure having a plurality of diameters (inner diameter, outer diameter). That is, the shaft portion 50 has a large-diameter first shaft portion 50m and a coaxial second shaft portion 50n having a diameter set to be smaller than the diameter of the first shaft portion 50m. As described above, since the shaft portion 50 has a cylindrical shape with a plurality of steps, the diameter of the shaft portion 50 can be gradually reduced from a large diameter to a small diameter.
The drawability of 0 is further improved, and it is easy to cope with the case where the shaft length of the shaft portion 50 is set long.

Therefore, as shown in FIG.
The zero tip 50p reaches the mounting surface 13 of the cylinder block 10 of the internal combustion engine 1 in the direction of the arrow X1, and reaches the pump chamber 11 of the cylinder block 10 of the internal combustion engine 1. However, the present invention is not limited thereto, and the tip of the shaft portion 50 may not reach the mounting surface 13 of the cylinder block 10 of the internal combustion engine 1 in the direction of arrow X1.

The first shaft portion 50m having a diameter larger than the diameter of the second shaft portion 50n and the third cylindrical portion 24 of the body 2
, A ring-shaped bearing 6 is provided. This makes it possible to cope with a case where the diameter of the bearing 6 is large. A large diameter of the bearing 6 is advantageous for improving the reliability of the bearing 6 and extending its life.

As shown in FIG. 3, the pulley portion 40 of the pulley member 4 is applied as a stopper to the shaft end 6c of the bearing 6 (the side facing the cylinder block 10 of the internal combustion engine 1) to hold the bearing 6. It has a second musical composition part 32 for improving the performance. Second
The bent portion 32 is formed by bending the upright wall portion 42 of the pulley portion 40. In other words, the vertical wall portion 42 of the pulley portion 40 has a substantially C-shaped or V-shaped portion in a cross section along the axial length direction of the shaft portion 50, and is applied to the shaft end 6 c of the bearing 6 as a stopper. A second bent portion 32 is formed. Thereby, the pull-out resistance of the bearing 6 is improved.

As shown in FIG. 3, the third cylindrical portion 2 of the body 2
A cylindrical insertion member 96 is inserted substantially coaxially between the outer ring 4 of the bearing 6 and the outer ring 60 of the bearing 6. Inserting the insertion member 96 in this manner is advantageous for adjusting the diameters of the bearing 6 and the body 2. Further, it is also advantageous to supplement the rigidity of the third tubular portion 24 of the tubular portion 21 of the body 2. The standing wall portion 42 of the pulley portion 40 of the third cylindrical portion 24 of the body 2
Shaft end 24c is ΔM in the direction of arrow X2
(See FIG. 3) The shaft end 96c of the insertion member 96 on the side of the upright wall portion 42 of the pulley portion 40 projects from the bearing 6 in the direction of arrow X2 by ΔM (see FIG. 3). The insertion member 9 thus protruding from the bearing 6 in the direction of the arrow X2.
6 and the shaft end 24c of the third cylindrical portion 24 of the body 2
Are connected by a welded portion 98. By doing so, the welded portion 98 can be kept away from the bearing 6, which can contribute to the improvement of the reliability of the bearing 6 and further improve the durability of the bearing 6.

As shown in FIG. 3, the axial length of the cylindrical insertion member 96 is set longer than the axial length of the third cylindrical portion 24 of the body 2. Accordingly, the shaft end 96a of the insertion member 96 on the side of the internal combustion engine 1 is located on the side of the rotary blade member 8 in the axial length direction of the shaft portion 1 with respect to the third cylindrical portion 24 of the body 2, that is, in the direction of arrow X1 (see FIG. ) Projecting. The shaft end 96a of the bearing 6 is held by using the shaft end 96a of the insertion member 96 projecting in the arrow X1 direction. By doing so, the bearing 6 is connected to the rotating blade member 8.
, That is, in the direction of arrow X1 as much as possible, which can contribute to shortening of the axial length of the water pump. Note that, instead of the welding portion 98, the insertion member 96 and the body 2 may be connected by a caulking portion.

The rotary blade member 8 has a central boss 80 formed by deep drawing, and a plurality of blades 86 integrally held by the central boss 80. The central boss portion 80 is located on the side opposite to the blade 86 in the axial direction of the shaft portion 50. The central boss portion 80 of the rotary blade member 8 has a hollow shape with a bottom, and has a pipe body 82 having a hollow chamber 81 and a closing wall 83 for closing the distal end side of the hollow chamber 81 of the pipe body 82.
have. A central boss portion 80 provided on the rotating blade member 8 on the side opposite to the blade 86 is press-fitted and fixed inside the shaft hollow chamber 51 of the shaft portion 50 of the pulley member 4. In other words, the central boss 8 of the rotary blade member 8
The outer wall surface of No. 0 is pressed against the inner wall surface of the shaft portion 50 of the pulley member 4 that defines the hollow shaft chamber 51. The closing wall 83 of the central boss portion 80 of the rotary blade member 8 closes the shaft hollow chamber 51 of the shaft section 50 of the pulley member 4, and water in the pump chamber 11 leaks into the shaft hollow chamber 51 of the shaft section 50. Has been prevented. The hollow chamber of the pipe body 82 of the rotary blade member 8 faces the pump chamber 11.

(Other Example) According to the above-described embodiment, the center boss portion 80 provided on the opposite side of the rotary blade member 8 from the blade 86 is the shaft hollow chamber 51 of the shaft portion 50 of the pulley member 4. Is press-fitted and fixed inside, but is not limited to press-fitting and may be fixed by welding or may be fixed by mechanical caulking. The above embodiment is applied to a water pump for water supply provided in an internal combustion engine of a vehicle, but may be a water pump for water supply provided in another engine. The shape and size of each component are not limited to the above-described embodiments and examples, and can be appropriately changed without departing from the gist. In addition, the present invention is not limited to only the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the gist. The words described in the above embodiments and examples can be described in the claims even if they are part.

(Supplementary Note) The following technical idea can be understood from the above description. (Additional Item 1) A boss attached to a base having a pump chamber, a pulley rotated by a winding conductive member, and a shaft hollow chamber provided substantially coaxially in a central region of the pulley. A pulley member having a hollow cylindrical shaft portion penetrating in the axial direction having a distal end opening located on the distal end side of the shaft hollow chamber and a proximal end opening located on the proximal end side of the shaft hollow chamber, and the body A bearing provided between the shaft and the pulley member, the bearing being rotatable with respect to the body, a central boss fixed to a shaft of the pulley member, and a pump function provided at the central boss. And a rotary wing member having a blade that plays the role of a water pump, wherein the central boss portion of the rotary blade member has a hollow chamber directly facing the pump chamber of the base. Flop. This is advantageous for increasing the volume of the pump chamber and improving the pump capacity. In this case, the cylindrical shaft portion may be formed in a form other than drawing. (Additional Item 2) In Additional Item 1, the central boss portion and the blade of the rotary blade member are arranged in opposite directions in the axial length direction of the shaft portion, and the central boss portion of the rotary blade member is A water pump, wherein the water pump is fitted inside the shaft hollow chamber of a shaft portion of a pulley member. The shaft length of the shaft portion can be reduced. Further, it is possible to suppress water from entering the hollow shaft chamber. (Additional Item 3) A shaft hollow chamber and a tip end of the shaft hollow chamber are provided, which have a pulley section rotated by a wrapping conductive member, and are provided substantially coaxially by drawing in a central region of the pulley section. A pulley member having a cylindrical shaft portion penetrating in the axial direction having a distal end opening located on the side and a proximal end opening located on the proximal end side of the shaft hollow chamber; and A fluid pump, comprising: a bearing provided between the pulley member and the bearing to rotate the pulley member with respect to the body; and a rotary blade member fixed to a shaft of the pulley member. The drawability of the shaft part of the pulley member is secured,
Even when drawing conditions are severe, the uniformity of the thickness of the peripheral wall of the shaft portion is improved, which is advantageous for further balancing the rotational balance in the shaft portion of the pulley member. (Supplementary claim 4) The water pump or the fluid pump according to any one of the preceding claims, wherein the tip of the shaft portion has not reached the pump chamber of the internal combustion engine or has entered the pump chamber. This is advantageous for shortening the axial length of the shaft portion. (Supplementary note 5) In each claim or each supplementary note, the central boss portion of the rotating blade member protrudes in a direction opposite to the blade, and is located outward of a mounting surface of an engine such as an internal combustion engine in the axial direction of the shaft portion. A water pump or a fluid pump. The axial length of the shaft portion can be reduced, which is advantageous for shortening the axial length of the water pump. (Supplementary claim 6) The water pump or the fluid pump according to each of the claims or the supplementary claims, wherein the central boss portion of the rotary blade member has a hollow chamber directly facing the pump chamber. This is advantageous for increasing the volume of the pump chamber and improving the pump capacity. (Supplementary claim 7) The water pump or the fluid pump according to each claim or each supplementary claim, wherein at least one of the body and the pulley member has a stopper for a bearing. (Additional Item 8) A water pump or a fluid pump according to any one of the preceding claims or each of the additional items, wherein at least one of the body and the pulley member has a curved portion that functions as a stopper for the bearing. (Additional Item 9) The water pump or the fluid pump according to any one of the preceding claims, wherein an insertion member is interposed between at least one of the body and the pulley portion and the bearing.

[0049]

According to the water pump of the present invention,
The pulley member has a pulley portion that is rotated by a bell that is a winding conductive member, and a shaft portion that is integral with the pulley portion. The shaft portion has a hollow cylindrical shape penetrating in the axial length direction, and includes a shaft hollow chamber, a distal opening located at a distal end side of the shaft hollow chamber, and a proximal opening located at a proximal end side of the shaft hollow chamber. With As described above, since the shaft portion has a cylindrical shape penetrating in the axial direction of the shaft portion and has a non-bottomed hollow shape having no bottom wall portion, the shaft portion has a bottomed hollow shape having a bottom wall portion. Compared with the above, the drawability (deep drawability) of the shaft portion of the pulley member is better ensured.

Further, according to the water pump of the present invention, the central boss portion of the rotary blade member is fitted inside the shaft hollow chamber of the shaft portion of the pulley member, and the central boss portion of the rotary blade member is connected to the pulley member. The shaft length of the shaft portion can be reduced as compared with the case where the shaft portion is fitted to the outside of the shaft portion. That is, unlike the case where the central boss portion of the rotating blade member is fitted to the outside of the shaft portion of the pulley member, as shown in FIG. The degree of protrusion toward the member side, that is, the side toward the pump chamber, is reduced, and it is not necessary to excessively protrude toward the pump chamber so that a large amount of the axial end of the shaft portion protrudes into the pump chamber.

As described above, according to the water pump of the present invention, the shaft length of the shaft portion of the pulley member can be shortened, so that the drawability (deep drawability) of the shaft portion is ensured.

Therefore, according to the water pump of the present invention, the uniformity of the wall thickness of the peripheral wall of the shaft portion is improved even when the conditions for drawing are severe. As a result, even when the pulley member rotates, particularly when the pulley member rotates at high speed, it is advantageous to further balance the rotational balance in the shaft portion of the pulley member. When the rotational balance is balanced in this way, it is advantageous for improving the durability of the bearing and extending the life. Further, when the sealing means is provided in the vicinity of the shaft portion, it is advantageous for improving the durability of the sealing means and extending the life.

[Brief description of the drawings]

FIG. 1 is a sectional view of a water pump according to a first embodiment.

FIG. 2 is a sectional view of a water pump according to a second embodiment.

FIG. 3 is a sectional view of a water pump according to a third embodiment.

FIG. 4 is a cross-sectional view of a water pump according to the related art.

[Explanation of symbols]

In the figure, 1 is an internal combustion engine, 2 is a body, 4 is a pulley member, 4
Reference numeral 0 denotes a pulley portion, 50 shaft portion, 51 denotes a shaft hollow chamber, 52 denotes a distal end opening, 53 denotes a base end opening, 6 denotes a bearing, 8 denotes a rotating blade member, 80 denotes a central boss portion, 83 denotes a closing wall, and 9 denotes a seal. Means are shown.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Nakajo 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki Co., Ltd. (72) Inventor Junya Yamamoto 2-1-1 Asahi-cho, Kariya-shi, Aichi Aisin Seiki F term (reference) 3H033 AA01 AA15 BB01 BB06 CC01 CC05 DD01 DD25 DD30 EE05

Claims (2)

[Claims] 1. A shaft hollow and a tip of the shaft hollow, which have a body and a pulley rotated by a winding conductive member, and are provided substantially by coaxial drawing in a central region of the pulley. A pulley member having a cylindrical shaft portion penetrating in the axial length direction having a distal end opening located on the side and a proximal end opening located on the proximal end side of the shaft hollow chamber; and A water pump including: a bearing provided between the pulley member, the bearing being rotatable with respect to the body; and a rotating blade member having a pump function and fixed to a shaft portion of the pulley member. The rotary blade member has a central boss portion and a blade, and the central boss portion is fitted inside the shaft hollow chamber of the shaft portion of the pulley member. Data pump. 2. The rotating blade member according to claim 1,
A hollow boss having a closed bottom and having a closed bottom, and a blade protruding in a direction opposite to the center boss in the axial direction of the shaft, the center boss of the rotary blade member; The water pump is characterized in that the portion is fitted inside a shaft hollow chamber of the shaft portion, and the shaft hollow chamber of the shaft portion is closed off by the closing wall.