JPH08326690A - Pump - Google Patents

Abstract

PURPOSE: To improve durability of a bearing, and simplify a device structure. CONSTITUTION: In a pump provided with a pump main body 2 in which a liquid passage 2A is housed, a shaft hole 5 formed on a position facing to the liquid passage 2A in the pump main body 2, a main shaft 6 arranged on the shaft hole 5, and a bearing 9 arranged on the shaft hole 5 forming part of the pump main body 2, a sliding part A of the main shaft 6 and the bearing 9, and flow passages 11, 12 for connecting the inlet 21 and the outlet 4 of the liquid passage 2A to each other, are arranged.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pump used in, for example, a water pump for a water-cooled engine of an automobile.

[0002]

2. Description of the Related Art A conventional pump of this type is shown in FIG.
This pump is applied to a water pump such as a water-cooled engine of an automobile.
We are trying to make the 00 lighter and more compact.

That is, the water pump 100 includes a liquid passage 101 in a body 101 as a hollow pump body.
A cooling water inlet 102 and a cooling water outlet 103 forming A are provided, and a shaft hole 104 penetrating to the outside of the body 101 is provided at a position facing the liquid passage 101A of the body 101, and the main shaft 105 is provided in the shaft hole 104. The shaft hole 104 of the body 101 is inserted in order to make it lightweight and compact.
A resin bearing 106 is provided as a bearing in the formation portion of.

The resin bearing 106 is formed by molding the body 101 itself with a resin and has a function of a slide bearing. Then, in order to lubricate the resin bearing 106, the main shaft 10
5 is provided with a helical lubricating groove (not shown) in the sliding portion A between the resin bearing 106 and the resin bearing 106 for introducing the cooling water in the liquid passage 101A by the screw pump action during rotation of the main shaft 105,
Further, as shown in FIG. 4, a connecting pipe 107, which is the shaft hole 104 and connects the outside of the body 101 with respect to the sliding portion A and the cooling water outlet 103, is provided, and the inlet of the connecting pipe 107 (on the lubricating groove side) is provided. ) And the outlet (on the side of the cooling water outlet 103), the cooling water is returned from the lubrication groove to the cooling water outlet 103, that is, circulated.

By circulating the cooling water through the connecting pipe 107, the sliding portion A is prevented from being burned.

[0006]

However, in the case of the above-mentioned conventional technique, a differential pressure is generated between the inlet and the outlet of the connecting pipe 107, which can secure a flow rate sufficient to cool the sliding portion A. However, the sliding portion A is exposed to a high temperature due to insufficient cooling, which may adversely affect the life of the resin bearing 106.

In addition, Japanese Utility Model Laid-Open No. 63-190519 has been proposed as lubrication in the sliding portion between the main shaft and the slide bearing.

This utilizes the lubricating oil from an oil pump which circulates the lubricating oil in the engine.

That is, since the lubricating oil supply and discharge passages communicating with the oil pump are provided in the pump body (body) of the water pump, part of the lubricating oil from the oil pump enters the body through the supply passage. The sliding surface between the main shaft and the sliding bearing is provided to lubricate the sliding surface, and the lubricated lubricating oil is discharged from the discharge passage to the oil pan.

However, since the lubricating liquid is taken in not from the water pump but from the oil pump which is another device, it is necessary to form a connecting portion or a passage for communicating with the supply and discharge passages to the other device. However, it affects the configuration of other devices.

Further, since the lubricating liquid is oil, it is necessary to separately provide an oil seal in the sliding portion, resulting in an increase in the number of parts.

Further, since the supply and discharge passages for the lubricating oil are formed by the body composed of a plurality of constituent parts, the body cannot be molded by one molding die.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a pump capable of improving the durability of the bearing and simplifying the apparatus structure. To provide.

[0014]

In order to achieve the above object, according to the present invention, a pump main body having a liquid passage therein, and a shaft hole formed at a position of the pump main body facing the liquid passage. A pump provided with a main shaft arranged in the shaft hole and a bearing provided in a shaft hole forming portion of the pump body, a sliding portion between the main shaft and the bearing, and an inlet and an outlet of the liquid passage. It is characterized in that a flow path connecting each of and is provided.

A lubrication groove for introducing the liquid in the liquid passage may be provided on the sliding surface between the main shaft and the bearing.

It is also preferable that the lubrication groove is formed of a spiral or continuously reduced pressure passage.

Further, it is also preferable to provide a first blade arranged on the inlet side of the liquid passage of the main shaft and a second blade arranged on the shaft hole side.

However, it is also preferable that the second blade is configured to convey the liquid in the axial hole direction by the rotation of the main shaft, or a plurality of blades that are eccentrically spirally separated from the center of rotation.

In the pump having the above structure, since the inlet and the outlet of the liquid passage in which the most differential pressure is generated in the pump are connected by the flow passages through the sliding portions of the main shaft and the bearing, respectively. Due to the large differential pressure, a larger amount of liquid is introduced from the outlet side of the high pressure liquid passage to the sliding part than the amount of liquid that is introduced by the conventional lubrication groove only, and then the liquid is introduced to the inlet side of the low pressure liquid passage. Is discharged.

Further, by providing a lubricating groove in the sliding portion, a large amount of the liquid as described above is provided on the sliding surface between the main shaft and the bearing through the flow path connected to the outlet of the liquid passage by the lubricating groove. Is introduced and lubricated on the sliding surface, and the lubricated liquid is discharged to the inlet side through the flow path connected to the inlet of the liquid passage.

Further, by making the lubricating groove spiral, a large amount of liquid is introduced into the sliding surface by the screw pump action.

The liquid in the depressurization channel is depressurized by the same action as the labyrinth seal.

Further, the liquid in the liquid passage is conveyed from the pump inlet side to the pump outlet side by the first blades arranged on the inlet side of the liquid passage of the main shaft, and is arranged on the shaft hole side. The second blade prevents liquid from staying near the shaft hole and supplies the liquid to the bearing.

However, the structure in which the second blade conveys the liquid in the axial hole direction by the rotation of the main shaft is, for example,
This can be implemented by rotating a plurality of blades that are spirally eccentric from the center of rotation in the direction that conveys the liquid in the centripetal direction, and the liquid is conveyed in the axial hole direction, and the liquid is conveyed from the second blade side to the bearing. Supplied.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

(First Embodiment) FIG. 1 shows a pump according to a first embodiment, which is applied to a water pump 1 as in the conventional case.

A cooling water inlet 3 and a cooling water outlet 4 forming a liquid passage 2A are provided in the body 2 as a hollow pump body. The body 2 is fixed to the housing 20, and a pump inlet 21 to which cooling water such as antifreezing liquid is supplied from the outside formed in the housing 20 and the body 2.
And a pump outlet 22 from which the cooling water from the cooling water outlet 4 of the body 2 formed in the housing 20 is discharged. That is, the liquid passage 2A
Consists of a pump inlet 21-cooling water inlet 3-cooling water outlet 4-pump outlet 22.

A shaft hole 5 penetrating to the outside of the body 2 is provided at a position of the body 2 facing the cooling water outlet 4.
The main shaft 6 is inserted. An impeller 7 is fixed to the inner side of the body 2 of the main shaft 6, while a pulley 8 is fixed to the outer side of the body 2.

Further, a resin bearing 9 is provided in the portion where the shaft hole 5 of the body 2 is formed. In this resin bearing 9, the body 2 itself is molded of resin and has a function of a slide bearing.

Since the body 2 itself is made of resin in this way, the weight of the water pump 1 is reduced.

Further, there are through holes 10 and 10A penetrating in the vertical direction in the drawing through the shaft hole 5 on the outer side of the sliding portion A between the main shaft 6 of the body 2 and the resin bearing 9. In addition, the wall 41 of the cooling water outlet 4 of the body 2 has a through hole 42 that opens to the cooling water outlet 4. Furthermore, the wall 23 of the pump inlet 21 of the housing 20 has a through hole 24 that opens into the pump inlet 21.

Then, the through hole 10 on the lower side in the figure on the outside of the sliding portion A of the body 2 and the wall 41 of the cooling water outlet 4 of the body 2 are provided.
And the through hole 42 of the body 8 are connected by the first connecting pipe 11 as a flow path provided through the inner peripheral side of the pulley 8, and the through hole 10A on the outer side of the sliding portion A of the body 2 in the figure. The housing 20 and the through hole 24 of the wall 23 of the pump inlet 21 of the housing 20 are connected by the second connecting pipe 12 as a flow path provided through the inner peripheral side of the pulley 8.

By thus providing the first connecting pipe 11 and the second connecting pipe 12, the cooling water outlet 4 and the pump inlet 21 are communicated with each other through the shaft hole 5 and the outside of the sliding portion A. .

On the other hand, a mechanical seal 13 is provided on the exposed side of the main shaft 6 of the body 2. The mechanical seal 13 may be a known one composed of a driven ring, a seat ring, a spring, etc.

The water pump 1 configured as described above
Is transmitted from the driving source (not shown) to the main shaft 6 via the pulley 8, the main shaft 6 rotates, and the cooling water flows from the pump inlet 21 → the cooling water inlet 3 → the cooling water outlet 4 → the pump outlet 22. .

According to the above construction, the pump inlet 21 which is the inlet of the liquid passage 2A where the most differential pressure is generated in the water pump 1 and the cooling water outlet 4 which is the outlet are the shaft hole 5 and the sliding portion A. Since the first and second connecting pipes 11 and 12 are connected to each other, the large differential pressure causes the cooling water guided from the cooling water outlet 4 side having a high pressure to the sliding portion A only by the conventional lubricating groove. A larger amount of cooling water than the amount is introduced, and then the cooling water is discharged to the pump inlet 21 side where the pressure is low.

As described above, since a large amount of cooling water is introduced into the sliding portion A, the resin bearing 9 is forcibly cooled, and the durability of the resin bearing 9 can be improved.

Further, since the cooling water of the water pump 1 is used for the lubrication of the resin bearing 9, the lubricating oil is used by another device as in the other conventional example (see Japanese Utility Model Laid-Open No. 63-190519). While a passage or the like is provided from a certain oil pump and is taken in, it is only necessary to replace it with the water pump 1, and there is no influence on the configuration in other devices. In addition, it is not necessary to separately provide an oil seal for sealing the lubricating oil unlike the other conventional examples using the lubricating liquid as oil. From these, the device configuration can be simplified without increasing the number of parts.

Further, since the body 2 has only the through holes 10 and 10A for connecting the first and second connecting pipes 11 and 12, the body 2 can be molded by one resin mold. Therefore, it is easy to manufacture and has excellent manufacturability.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention.
Is shown. In the above-described embodiment, as the flow path that connects the sliding portion A and the inlet of the liquid passage 2A,
The second connecting pipe 1 via the through hole 24 in the wall 23 of the pump inlet 21 as the inlet of the liquid passage 2A of the housing 20.
2 are connected, but in this embodiment, the second connection pipe 1
Instead of connecting 2 to the pump inlet 21 side, a second connecting pipe 12A facing the pump inlet 21 side is provided on the resin bearing 9 and the outer peripheral side of the main shaft 6.

With such a structure, it is not necessary to provide the through hole 24 in the housing 20 as in the first embodiment. Therefore, the water pump according to the second embodiment can be used in the housing used up to now. All you need to do is attach it, and it is highly versatile.

Since the other structure and operation are the same as those of the first embodiment, the same components are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

(Third Embodiment) In the above-mentioned embodiment, the sliding portion A between the main shaft 6 and the resin bearing 9 is a flat surface. However, as shown in FIG. 3A, the cooling water in the liquid passage 2A is A lubricating groove 30 introduced to the sliding portion A may be provided.

In this embodiment, the lubricating groove 30 is formed in a spiral shape on the outer circumference of the journal 31 of the main shaft 6. Thereby, during rotation of the main shaft 6 in a predetermined direction,
A large amount of liquid is supplied from the cooling water outlet 4 to the sliding portion A of the shaft hole 5 through the first connecting pipe 11, and the lubricating groove 30 acts on the sliding surface between the main shaft 6 and the resin bearing 9 by the action of the screw pump. It is introduced in large quantities and lubricated. After that, the cooling water is discharged to the pump inlet 21 side through the second connecting pipe 12A.

As described above, since a large amount of cooling water is introduced to the sliding surface, the cooling effect of the resin bearing 9 is enhanced, and the durability of the resin bearing 9 can be further improved.

Of course, this lubricating groove 30 may be applied to the first embodiment. However, although not shown, the cooling water after lubrication includes a through hole that is the axial hole 5 and that is provided on the inner side of the body 2 with respect to the journal 31 and that penetrates in the radial direction and the through hole 24 included in the housing 20. The second connecting pipe 12 to be connected is discharged to the pump inlet 21 side.

Further, as shown in FIG. 3B, a lubricating groove 30A may be provided in which a spirally and continuously narrowed flow passage is provided on the outer peripheral surface of the journal 31 of the main shaft 6, and FIG.
As shown in (c), the flow path may be gradually narrowed. With such a configuration, the cooling water is depressurized by the lubricating groove 30A by the same action as the labyrinth seal. Therefore, the sealing means used on the outer end face side of the body 2 is not limited to the complicated mechanical seal 13 as in each of the above-described embodiments, but a simple sealing member such as an oil seal can suffice, and the weight can be reduced by reducing the number of constituent parts. And cost reduction can be realized.

In each of the above embodiments, the bearing using the resin bearing is described as an example for the purpose of weight reduction, but of course, other materials can be similarly applied.

(Embodiment 4) In the above embodiment, the pressure difference between the pump inlet 21 and the outlet 22 where the maximum pressure difference is generated when the pump is operating is utilized. However, this differential pressure depends on the rotational speed of the main shaft 6.

In a water-cooled engine for an automobile as an example to which the present invention is applied, the water-cooled engine is operated at a rotational speed of several hundred rpm at idling and several thousand rpm at high speed, depending on the operating state of the water-cooled engine. .

Therefore, in the state where the main shaft of the pump is connected to the water-cooled engine and is operated, the rotational speed of the blades changes, and the pressure difference generated also changes accordingly. In particular, there is a case where the pressure difference is low at the time of idling and the flow rate of the cooling water flowing into the sliding portion A between the main shaft 6 and the resin bearing 9 may not be sufficiently secured, which affects the durable life of the resin bearing 9. There is a problem.

In the fourth embodiment, the pump inlet 21
Even if the pressure difference between the outlet 22 and the outlet 22 is small, a means for achieving the problem of supplying a sufficient amount of cooling water to the sliding portion A of the main shaft 6 and the resin bearing 9 is shown.

In FIG. 4A, the same components as those in the embodiment of the invention described above are designated by the same reference numerals and the description thereof will be omitted.

Reference numeral 51 denotes a first vane disposed on the inlet side of the liquid passage of the main shaft, by which the cooling water in the liquid passage is conveyed from the pump inlet side to the pump outlet side. And a pressure difference is generated. Further, reference numeral 52 is a second blade disposed on the resin bearing 9 side as the shaft hole side, and is integrally formed on the back side of the first blade 51 in the present embodiment.

When the rotation speed of the spindle 6 is low, the first
In the third to third embodiments, since the second blade 52 is not provided, the cooling water in the vicinity of the shaft hole 5 stays, and the cooling water in the sliding portion A does not circulate and becomes a high temperature. In some cases, the vapor lock phenomenon may occur, but the second vane 52 prevents the cooling water in the vicinity of the shaft hole 5 from moving and staying. Circulate.

FIG. 4 (b) is a view of the second wing 52 as seen from the BB surface of FIG. 4 (a). The second blade 52 includes a plurality of blades that are eccentric to the center of rotation in a spiral manner, and transports cooling water in the centripetal direction during low-speed rotation. With this configuration, even when the pump is operated at a low speed, the cooling water is forcibly poured into the shaft hole 5 and enters the sliding surface A to compensate for the cooling and lubricating effect of the sliding surface A.

However, when the pump is rotated at a high speed, the second blade 52 also conveys the cooling water in the centrifugal direction, but in this state, the first connecting pipe 11 and the second connecting pipe 11
Since the cooling water is sufficiently supplied and discharged by the connecting pipe 12, cooling and lubrication of the sliding surface A will not be insufficient.

The shape of the second wing 52 is not limited to the application of any other shape, and a propeller shape or a screw shape may be provided on the side of the shaft hole 5 or the shaft hole 5 It is possible to convey the cooling water in the vicinity, and the cooling water on the sliding surface A circulates accordingly.

[0059]

The present invention has the above-mentioned structure and operation, and the inlet and outlet of the liquid passage in the pump where the most differential pressure is generated are respectively formed in the flow passages through the sliding portions of the main shaft and the bearing. Because they are connected, the large differential pressure
A larger amount of liquid is introduced from the outlet side of the high pressure liquid passage to the sliding part than the amount of liquid introduced by the conventional lubrication groove only, and then the liquid is discharged to the inlet side of the low pressure liquid passage. Become.

As described above, since a large amount of liquid is introduced into the sliding portion, the bearing is forcibly cooled, and the durability of the bearing can be improved.

Further, as mentioned above, since the liquid of the pump is used for the lubrication of the sliding portion, the conventional example (actually developed 63
No. 190519), the lubricating oil is taken in from an oil pump, which is another device, by providing a passage or the like, but only the pump according to the present invention needs to be replaced, and the other devices have a structural influence. There is no. In addition, it is not necessary to separately provide an oil seal for sealing the lubricating oil unlike the above-mentioned conventional example using the lubricating liquid as oil. From these,
The device configuration can be simplified without increasing the number of parts.

Further, since the pump body is merely connected to the inlet and the outlet of the liquid passage through the flow passage, and it is not necessary to provide the flow passage in the pump body, the pump body can be molded by one molding die. Because it is possible, it is easy to manufacture and has excellent manufacturability.

Further, by providing a lubricating groove in the sliding portion, a large amount of liquid as described above is formed on the sliding surface between the main shaft and the bearing through the flow path connected to the outlet of the liquid passage by the lubricating groove. Is introduced and lubricated on the sliding surface, and the lubricated liquid is discharged to the inlet side through the flow path connected to the inlet of the liquid passage.

As described above, since a large amount of liquid is introduced into the sliding surface, the cooling effect of the bearing is enhanced and the durability of the bearing can be further improved.

Further, by making the lubricating groove spiral, a large amount of liquid is introduced into the sliding surface by the action of the screw pump, and the durability of the bearing is further improved.

Further, since the liquid in the depressurized flow path is depressurized by the same action as the labyrinth seal, the sealing means for sealing between the pump body and the main shaft may also have a simple structure, and the weight and cost can be reduced. The effect that can contribute to.

Further, by the second blade disposed on the side of the shaft hole, when the pump is operated at low speed,
Even when the pressure difference between the pump inlet side and the outlet side is not large, the liquid in the vicinity of the shaft hole is prevented from accumulating, and the liquid in the bearing is transported and circulated, improving the durability of the bearing. To do.

Further, in the case where the second wing rotates in a direction in which a plurality of wings eccentrically spirally eccentric from the center of rotation convey the liquid in the centripetal direction, the main shaft rotates to cause the axial hole direction. The liquid is conveyed to the bearing and the liquid is supplied to the bearing from the second blade side.

[Brief description of drawings]

FIG. 1 is a front sectional view of essential parts showing a first embodiment in which the present invention is applied to a water pump.

FIG. 2 is a front sectional view of an essential part showing a second embodiment in which the present invention is applied to a water pump.

FIG. 3 is a partially sectional front view showing a sliding portion between a main shaft and a resin bearing as a third embodiment.

FIG. 4 is a front sectional view of essential parts of a water pump according to a fourth embodiment.

FIG. 5 is a front sectional view of a main part of a conventional water pump.

[Explanation of symbols]

 1 Water Pump (Pump) 2 Body (Pump Body) 2A Liquid Passage 3 Cooling Water Inlet 4 Cooling Water Outlet 41 Wall 42 Through Hole 5 Shaft Hole 6 Main Spindle 7 Impeller 8 Pulley 9 Resin Bearing (Bearing) 10, 10A Through Hole 11th 1 Connection Pipe (Flow Path) 12, 12A Second Connection Pipe (Flow Path) 13 Mechanical Seal 20 Housing 21 Pump Inlet 22 Pump Outlet 23 Wall 24 Through Hole 30, 30A Lubrication Groove 31 Journal 51 First Blade 52 Second wing

Claims (7)

[Claims] 1. A pump body containing a liquid passage, a shaft hole formed in the pump body at a position facing the liquid passage, a main shaft arranged in the shaft hole, and a shaft hole of the pump body. A pump provided with a bearing provided in a forming part, wherein a pump is provided, which is provided with a flow path that connects a sliding part between the main shaft and the bearing and an inlet and an outlet of the liquid passage. 2. The pump according to claim 1, wherein a lubricating groove for introducing the liquid in the liquid passage is provided on a sliding surface between the main shaft and the bearing. 3. The pump according to claim 2, wherein the lubricating groove has a spiral shape. 4. The pump according to claim 2, wherein the lubricating groove is a depressurized flow passage that is continuously narrowed. 5. A first wing provided on the inlet side of the liquid passage of the main shaft, and a second wing provided on the shaft hole side. , 2, 3 or 4 pump. 6. The pump according to claim 5, wherein the second blade conveys the liquid in the axial hole direction by the rotation of the main shaft. 7. The pump according to claim 5, wherein the second vane is a plurality of vanes spirally eccentric from the center of rotation.