JP2002122100A - Water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump capable of preventing reduction of evaporation efficiency of cooling water collected in a water collection part, even if the pump body is miniaturized. SOLUTION: This water pump is provide with an impeller 7, attached to a rotary shaft 4 supported rotatably in the pump body 1 via a bearing 3 to circulate cooling water in a cooling system and a sealing member 8, provided between the bearing 3 and the impeller 7 to prevent leakage of cooling water to a bearing 4 side from an impeller 7 side. The water collection part 1b, formed by drilling a hole in the pump body 1 from the direction crossing an axial line of the rotary shaft 4, and a drain hole 1c for leading cooling water leaking from the sealing member 8 into the water collection part 1b are formed in the lower part of the pump body 1. Even if the outside diameter of the pump body 1 is reduced, the area for contact of cooling water collected in the water collection part 1b with atmospheric air will not change, so that the evaporation efficiency of cooling water will not be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water pump mainly used for a water-cooled internal combustion engine.

[0002]

2. Description of the Related Art In a conventional water-cooled internal combustion engine, a water pump is provided in a cooling system, and the water pump circulates cooling water in the cooling system to cool the internal combustion engine.

As a water pump of this type, for example, a pump described in Japanese Utility Model Publication No. 6-23760 is known.

In the water pump disclosed in the above publication, a pump body b is mounted on a cylinder block a as shown in FIG. 5, and a rotary shaft c is rotatably supported on the pump body b via a bearing i.

A driving pulley d is attached to one end of the rotating shaft c. The driving pulley d is rotated by a crankshaft (both not shown) via an endless belt or the like, so that the other end of the rotating shaft c is rotated. The impeller e attached to the end is rotationally driven.

The impeller e is accommodated in a housing f formed between the pump body b and the cylinder block a, and receives the cooling water sucked from the cooling water inlet g with the rotation of the impeller e to the cooling water outlet h. It is configured to cool the internal combustion engine by discharging more and circulating it to the cooling system.

A mechanical seal j is provided between the housing f and the bearing i in order to prevent the cooling water in the housing f from leaking to the bearing i side. Some water leakage occurs.

[0008] If water leaks even slightly from the water pump, it is easy to be mistaken as a failure of the water pump.
And a water reservoir m communicating therewith is provided so that the cooling water leaked from the mechanical seal j is stored in the water reservoir m, thereby preventing water leakage from the water pump.

On the other hand, as shown in FIG. 5, a water reservoir m provided in the water pump disclosed in the above publication pierces a lower part of the pump body b from a direction parallel to the rotation axis c to form a cylindrical body parallel to the rotation axis c. And the opening of the water reservoir m is closed by a plug n.
Since the cooling water accumulated in the air cannot be discharged to the outside, the cooling water is evaporated to the atmosphere from the exhaust port p using the heat of the internal combustion engine transmitted from the cylinder block a.

For this reason, if the cooling water accumulated in the water reservoir m is not efficiently evaporated, the water reservoir m overflows and causes water leakage. It is necessary to make the contact area between the cooling water accumulated in m and the atmosphere sufficiently large.

In order to reduce the size of the water pump,
Although the drive pulley d is provided so as to cover the periphery of the pump body b, if the drive pulley d is reduced in diameter to increase the rotation speed of the water pump, the outer diameter of the pump body b also needs to be reduced to match the drive pulley d. There is.

[0012]

However, in the case where a water reservoir m having a cylindrical shape is provided so as to be parallel to the rotation axis c as in the water pump disclosed in the above-mentioned publication, the outer diameter of the pump body b is adjusted in accordance with the driving pulley d. When the diameter of the water reservoir is reduced, the inner diameter of the water reservoir m must be reduced as shown in FIG. There is a problem that the evaporation efficiency is reduced, the cooling water accumulated in the water reservoir m overflows, and water leakage occurs.

Further, since a lower part of the pump body b is formed by drilling the lower part of the pump body b in the axial direction of the rotating shaft c, a drain outlet k for guiding water leaking from the mechanical seal to the water reservoir m, Exhaust port p for discharging evaporated cooling water to the atmosphere
Has to be drilled obliquely from the housing side of the pump body b, so that there is a problem that it takes time to process the drain drain port k and the exhaust port p.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and does not reduce the evaporation efficiency of the cooling water accumulated in the water reservoir, and facilitates processing of the drain outlet. It is an object of the present invention to provide a water pump having a structure.

[0015]

According to a first aspect of the present invention, there is provided a pump body mounted on a body to be mounted, rotatably supported via a bearing in the pump body, and having one end rotated. A rotating shaft connected to the drive source, an impeller attached to the other end of the rotating shaft, and circulating cooling water in a cooling system of the attached body; and a bearing provided between the bearings and the bearing from the impeller side. A water pump having a seal member for preventing cooling water from leaking to the side, wherein a water reservoir portion and a seal member are formed by piercing the pump body in a lower part of the pump body from a direction intersecting the axis of the rotating shaft. A drain outlet for guiding the leaked cooling water to the water reservoir is formed, and an opening of the water reservoir is sealed by a sealing means.

According to the above configuration, even when the outer diameter of the drive pulley or the pump body is reduced to increase the rotation speed of the impeller, the area where the cooling water stored in the water reservoir contacts the atmosphere does not change. Since the cooling efficiency does not decrease and the cooling water does not leak from the water reservoir even after long-term use, there is no fear that the water pump is erroneously recognized as having failed.

After the water reservoir is pierced, the drain outlet can be pierced from the opening of the water reservoir, so that the drain outlet can be easily processed.

According to a second aspect of the present invention, an exhaust port for discharging cooling water evaporated from a water reservoir to the atmosphere is provided above the pump body.

According to the above configuration, the cooling water evaporated from the water reservoir is discharged to the atmosphere from the exhaust port and does not stay in the pump body, so that the efficiency of cooling water evaporation can be further improved.

According to a third aspect of the present invention, the exhaust port is provided on the same axis as the drain outlet.

With the above configuration, when the drain outlet is pierced, the exhaust outlet can also be pierced at the same time, so that the exhaust outlet can be easily processed.

According to a fourth aspect of the present invention, an eaves-shaped projection is provided on the upper part of the pump body so as to cover the upper part of the exhaust port.

With the above structure, it is possible to prevent foreign matter such as dust falling from above from entering the pump body through the exhaust port.

According to a fifth aspect of the present invention, in order to achieve the above object, the projecting portion is formed in an annular shape.

With the above structure, the dust d falling from above
Foreign matter from the left and right directions as well as such foreign matter can be prevented from entering the pump body through the exhaust port.

According to a sixth aspect of the present invention, the water reservoir and the drain outlet are formed so as to be orthogonal to the axis of the rotating shaft.

According to the above configuration, since the water reservoir and the drain outlet can be pierced from a direction perpendicular to the rotation axis, these processes can be performed easily and accurately, and the water reservoir and the drain outlet are inclined with respect to the axis. Compared to when piercing
Since the length of the pump body can be reduced, the size of the water pump can be reduced.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS.

FIG. 1 is a front view of the water pump, and FIG. 2 is a sectional view taken along the line AA of FIG.

The pump body 1 of the water pump is attached to an attached member 2 such as a cylinder block by a fixing tool (not shown) such as a bolt.

A bearing 3 is fitted in the pump body 1, and a rotary shaft 4 is horizontally and rotatably supported on the bearing 3.

One end of the rotating shaft 4 protrudes outside the pump body 1, and the center of the driving pulley 5 is fixed to the tip.

The drive pulley 5 is formed in a substantially bowl shape, and is provided so as to cover the periphery of the pump body 1 in order to reduce the size of the water pump, and is provided by an endless belt wound around the outer peripheral surface. The rotary shaft 4 is connected to a crankshaft (both not shown), and the rotary shaft 4 is driven to rotate by an endless belt or the like by the crankshaft.

The other end of the rotary shaft 4 protrudes into a housing 6 formed between the pump body 1 and the member 2 to be mounted, and an impeller 7 is mounted at the tip.

The housing 6 has a cooling water inlet 6a and a cooling water outlet 6b connected to a cooling system such as a cooling water passage provided in the member 2 to be mounted. The cooling water sucked in from the cooling water inlet 6a is discharged from the cooling water outlet 6b and circulated to the cooling system, whereby the internal combustion engine is cooled by the cooling water.

On the other hand, a seal member 8 such as a mechanical seal is provided between the bearing 3 and the impeller 7 to prevent the cooling water in the housing 6 from leaking to the bearing 3 side.

The seal member 8 has a seal ring 8a fixed to the pump body 1 side and a seal ring 8b fixed to the rotary shaft 4 side.
A structure is adopted in which the cooling water on the housing 6 side is prevented from leaking to the bearing 3 side by pressing the a and 8b against each other by the elastic means 8c such as a spring. .

In the lower part of the pump body 1, a water reservoir 1b for storing the cooling water leaked from the seal member 8 is provided.
A drain outlet 1c for guiding the leaked water to the water reservoir 1b is formed.

The water reservoir 1b is formed by drilling a lower part of the pump body 1b in a direction perpendicular to the axis of the rotating shaft 4, and is formed in a cylindrical shape whose center is perpendicular to the axis of the rotating shaft 4. The inner diameter D and the length L are set in accordance with the amount of cooling water leaking from the seal member 8, and the opening 1d opening on the lower surface of the pump body 1 is sealed by a sealing means 9 such as a plug. Have been.

After draining the cooling water leaking from the sealing member 8 to the water reservoir 1b, the drain outlet 1c is formed with the axis of the rotary shaft 4 from the opening 1d side of the water reservoir 1b after processing the water reservoir 1b. The pump body 1 is formed by piercing the pump body 1 in a direction orthogonal to the opening. The pump body 1 is opened at a position that is not blocked by the bearing 3 and the seal member 8.
When processing c, an exhaust port 1e for exhausting the cooling water evaporated from the water reservoir 1b to the atmosphere is also perforated, and foreign matter such as dust is discharged from the exhaust port 1e above the exhaust port 1e. An eave-shaped protruding portion 1f for preventing intrusion into the inside 1 is protruded.

As shown in FIG. 1, the projecting portion 1f is formed in an annular shape so that foreign matter can be prevented from entering from the left and right directions.

Although 1 g is a ventilation port opened above the water reservoir 1b so as to communicate with the atmosphere, it is not particularly necessary to provide it.

Next, the operation of the water pump constructed as described above will be described. The impeller 7 rotates with the rotation of the rotating shaft 4, and the cooling water sucked in from the cooling water inlet 6a is discharged from the cooling water outlet 6b to cool the water. Water is circulated to the cooling system to cool the internal combustion engine, but the seal member 8 has some water leakage due to its characteristics.

The cooling water leaked from the seal member 8 is guided to the water reservoir 1b by the drain outlet 1c, and is collected by the water reservoir 1b.
However, since the pump body 1 is attached to the heat-receiving member 2 such as a cylinder block, the water reservoir 1 b
The cooling water inside is heated and evaporates.

The evaporated cooling water is supplied to the annular space 10 formed between the bearing 3 and the seal member 8 through the drain outlet 1c.
Through the exhaust port 1e opened at the upper part of the annular space 10.
Since the cooling water is further discharged to the atmosphere, the cooling water stored in the water storage portion 1b does not overflow, thereby reliably preventing water leakage from the water pump.

On the other hand, in order to increase the rotation speed of the impeller 7,
When the diameter of the driving pulley is reduced as in the modified examples shown in FIGS. 3 and 4, it is necessary to reduce the outer diameter of the pump body 1, particularly the diameter of the lower part of the pump body 1 in accordance with the driving pulley 5.

For this reason, the length L of the water reservoir 1b provided at the lower part of the pump body 1 is smaller than that of the water pump shown in FIG. 2, and the amount of stored cooling water is also smaller.

However, in the embodiment of the present invention, since the water reservoir 1b is formed by drilling in a direction perpendicular to the axis of the rotating shaft 4, even if the outer diameter of the pump body 1 is reduced, There is no need to reduce the inner diameter D of the water reservoir 1b.

As a result, the contact area between the cooling water stored in the water storage section 1b and the atmosphere can be made the same as that of the water pump shown in FIG. 2, so that the evaporation efficiency of the cooling water does not decrease.

The drain outlet 1c and the exhaust port 1e for guiding the cooling water leaked from the seal member 8 to the water reservoir 1b are also in a direction perpendicular to the axis of the rotating shaft 4, so that the water reservoir 1b is perforated. When drilling, the drilling can be performed at the same time, so that the processing becomes easy.

In the above embodiment, the water reservoir 1b,
Although the drain port 1c and the exhaust port 1e are formed so as to be perpendicular to the axis of the rotating shaft 4, they may be provided to be slightly inclined.

[0052]

According to the present invention, as described in detail above, the pump body is pierced in the lower part of the pump body in a direction intersecting the axis of the rotating shaft to collect the water leaking from the water reservoir and the sealing member. Since the drain outlet leading to the drainage section is formed and the opening of the water reservoir is sealed by sealing means, the water is collected even when the outer diameter of the drive pulley or the pump body is reduced to increase the rotation speed of the impeller. The area where the cooling water stored in the part contacts the atmosphere does not change, so that the cooling water evaporation efficiency does not decrease, so that the cooling water does not leak from the water storage part even when used for a long time. Therefore, there is almost no fear that the water pump is mistaken as having failed.

After the water reservoir is pierced, the drain outlet can be pierced from the opening of the water reservoir, so that the drain outlet can be easily processed, and the pump body is provided with a water drain above the pump body. Since an exhaust port is provided to discharge the evaporated cooling water to the atmosphere, the cooling water evaporated from the water reservoir is exhausted to the atmosphere from the exhaust port and does not stay in the pump body. It can be further improved.

Further, since the exhaust port is provided on the same axis as the drain drain port, the exhaust port can be drilled at the same time as the drain drain port is drilled. An eaves-shaped projection is provided on the upper part of the pump body so as to cover the upper part of the exhaust port, so that it is possible to prevent foreign matter such as dust falling from above from entering the pump body from the exhaust port.

Further, if the projecting portion is formed in an annular shape, not only foreign matter such as dust d falling from above but also foreign matter from the left and right directions can be prevented from intruding into the pump body through the exhaust port, and the water reservoir can be formed. If the part and the drain outlet are formed so as to be orthogonal to the axis of the rotating shaft, the water reservoir and the drain outlet can be pierced from a direction orthogonal to the rotating shaft, so that these processes can be performed easily and accurately. Since the length of the pump body can be reduced as compared with the case where the water reservoir and the drain outlet are formed obliquely with respect to the axis, the size of the water pump can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a water pump according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a modification of the water pump according to the embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view showing a conventional water pump.

FIG. 6 is a sectional view showing a conventional water pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump body 1b Water reservoir 1c Drain drain 1d Opening 1e Exhaust port 1f Projection 2 Member to be attached 3 Bearing 4 Rotary shaft 6 Housing 7 Impeller 8 Seal member 9 Sealing means

Claims (6)

[Claims] 1. A pump body mounted on a body to be mounted, a rotary shaft rotatably supported in the pump body via a bearing and having one end connected to a rotary drive source, and the other end of the rotary shaft. And an impeller for circulating cooling water in a cooling system of the attached body, and a seal member provided between the bearing and the impeller and for preventing cooling water from leaking from the impeller side to the bearing side. A water pump comprising: a water reservoir formed by piercing the pump body in a lower part of the pump body in a direction intersecting with the axis of the rotating shaft; and a water reservoir for cooling water leaking from the seal member. A water pump, wherein a drain outlet leading to the water reservoir is formed, and an opening of the water reservoir is sealed by sealing means. 2. The water pump according to claim 1, wherein an exhaust port for discharging cooling water evaporated from the water reservoir to the atmosphere is provided above the pump body. 3. The water pump according to claim 2, wherein the exhaust port is provided on the same axis as the drain outlet. 4. An eaves-like projection is provided on an upper part of the pump body so as to cover an upper part of the exhaust port.
Or the water pump according to 2. 5. The water pump according to claim 4, wherein said projecting portion is formed in an annular shape. 6. The water pump according to claim 1, wherein the water reservoir and the drain outlet are formed in a direction orthogonal to an axis of the rotating shaft.