JP2587351Y2 - pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump used for a water pump for a water-cooled engine of an automobile, for example.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional pump of this type. That is, this pump includes a pump body 100 having a hollow inside, a shaft hole 101 formed through the pump body 100 so as to face the inside of the pump body 100, and a main shaft 102 inserted into the shaft hole 101. An impeller 103 fixed inside the pump body 100 of the main shaft 102, and a pump body 1 of the main shaft 102
00, a pulley 104 fixed to the outside,
And a mechanical seal 106 as a sealing member for sealing an annular gap between the shaft hole 101 and the main shaft 102.

The bearing 105 is provided between the main shaft 102 to which the pulley 104 is fixed and the shaft hole 101. Therefore, the mechanical seal 106 and the mechanical seal 106 are adjacent to each other at a predetermined interval in the axial direction.

In the pump constructed as described above, a driving force from a driving source (not shown) is transmitted to a main shaft 102 via a pulley 104, and the main shaft 102 rotates in a predetermined direction, so that an impeller 103 rotates and a pump body 100 rotates. The internal fluid is circulated.

[0005]

However, in the case of the prior art described above, since the bearing 105 and the mechanical seal 106 are arranged adjacent to each other with a predetermined axial separation therebetween, the leakage from the mechanical seal 106 has occurred. Although the fluid is discharged to the atmosphere through the discharge hole 107 from the shaft hole 101 between the bearing 105 and the mechanical seal 106, the fluid also flows toward the bearing 105, and the fluid leaking into the bearing 105 mixes, and gradually. The bearing 105 is deteriorated, and the life of the bearing 105 is significantly reduced.

[0006] Further, there is a structural defect that the mechanical seal 106 entraps rust water generated by the leakage of the fluid into the metal bearing 105 and reduces the sealing performance.

The pulley 104 of the prior art has a substantially cylindrical shape with a closed portion having a closed portion in the axial direction.
The ambient temperature is high and the bearing 105 is more disadvantageous.

As described above, the life of the pump itself is shortened.

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 life.

[0010]

In order to achieve the above object, according to the present invention, a shaft penetrating through a pump body is provided.
A cylindrical portion having a hole formed therein and inserted into an axial hole of the cylindrical portion.
And the main shaft is fixed to the inside of the pump body of the main shaft.
A pulley fixed to the outer side of the impeller and the pump body,
The pulley fixed to the outer peripheral portion of the cylindrical portion and the pump body
A bearing for rotatably held with respect to, contact in the axial direction
Disposed on the inner side of the pump body with respect to the bearing,
Seal that seals the annular gap between the shaft hole of the cylindrical part and the main shaft
And a member , wherein the pulley has an axial direction.
And a hole that communicates with the annular gap,
And a vane for generating a flow, the cylindrical portion, the axial direction
The annular gap between the bearing and the sealing member in the
A discharge hole is provided for communicating with the outside of the pump body .

[0011]

In the pump having the above structure, since the pulley is rotatably held on the cylindrical portion via the bearing, the fluid leaked from the seal member mounted in the shaft hole. Does not flow out of the shaft hole of the pump body. Therefore, since the leaked fluid does not enter the bearing, the bearing does not deteriorate. In addition, the annular gap from the pulley
Air and air flow through holes and vanes communicating between
The leaked fluid is forcibly formed by forming a passage for
The fluid is discharged to the outside and no longer flows into the bearing.
Therefore, deterioration of the bearing is further suppressed. In addition, the cooling effect of the bearing
Fruit can be expected.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. In FIG. 1 showing a pump according to an embodiment of the present invention, reference numeral 1 denotes a pump applied to a water pump for a water-cooled engine of an automobile. The pump 1 is fixed to the inside of the pump body 2 via a pulley 5 that is driven by an engine as a drive source and is fixed to the outside of the pump body 2 of the main shaft 4 inserted into the shaft hole 3 of the pump body 2. The rotation is transmitted to the impeller 6, and the cooling water, eg, LL, which is a fluid inside the pump body 2
C (Long life Coolant-engine coolant) is circulated.

The pump 1 has a pump body 2 having a hollow inside, a shaft hole 3 formed through the pump body 2 so as to face the inside of the pump body 2, and inserted into the shaft hole 3. Main shaft 4, an impeller 6 fixed to the inside of the pump main body 2 of the main shaft 4, a pulley 5 fixed to the outside of the pump main body 2 of the main shaft 4, and a pulley 5 rotatably held with respect to the pump main body 2. And a mechanical seal 8 as a seal member for sealing an annular gap between the shaft hole 3 and the main shaft 4.

The case 9, which is the portion of the pump body 2 where the shaft hole 3 is formed, is a separate body and is fixed to the open end of the pump body 2 in a liquid-tight manner. The case 9 is made of resin and includes a cylindrical portion 91 having the shaft hole 3 formed therein and a fixing portion 92 projecting radially outward for fixing to the pump body 2.

The shaft hole 3 is stepped, and the inside of the pump body 2 has a small diameter portion 31 and the outside of the pump body 2 has a large diameter portion 32.
It is made. Then, the mechanical seal 8 is mounted in the large diameter portion 32. Further, a concave portion 93 having a larger diameter than the large diameter portion 32 is formed in the small diameter portion 31 inside the pump body 2. The main shaft 4 is connected to the shaft hole 3 through the bush 10 fitted on the inner surface of the small diameter portion 31.
Inside, both ends protrude from case 9 and are inserted.

A resin impeller 6 is fitted and fixed to the main shaft 4 inside the pump body 2. A resin-made pulley 5 is fitted and fixed to the outside of the pump body 2 of the main shaft 4 via a pulley bush 11, and the pulley 5 is provided by a ball bearing 7 provided between the inner circumference of the pulley 5 and the outer circumference of the case 9. 5 is rotatably held with respect to the pump body 2.

The pulley 5 has a columnar shape, and is provided with a mounting recess 51 for mounting the ball bearing 7 on the pump body 2 side in the axial direction when fitted and fixed to the main shaft 4. For this reason, the radially central portion of the pulley 5 becomes the convex portion 52 and the outer peripheral portion becomes the rim 55, and the convex portion 52 is inserted into the large diameter portion 32 of the shaft hole 3.

The width of the mounting recess 51 is larger than the width of the ball bearing 7 to be mounted. At the bottom of the mounting recess 51, a hole 53 smaller than the width of the mounting recess 51 penetrates the bottom and has an entire circumference.
In this hole 53, a blade 54 is provided on the entire circumference, so that when the pulley 5 rotates, outside air flows to the pump body 2 side.

[0019] Then, the convex portion 52 of the pulley 5 is inserted into the large diameter portion 32 of the axial hole 3, the pulley 5 via a pulley bush 1 1 is fitted and fixed to the main shaft 4. At this time, FIG.
As shown in the figure, there are gaps between the outer peripheral surface of the convex portion 52 and the large diameter portion 32 of the shaft hole 3 and between the bottom surface of the mounting concave portion 51 and the end face of the opening of the cylindrical portion 91 of the case 9 forming the large diameter portion 32 of the shaft hole 3. have.

When the pulley 5 is fitted and fixed, the outer peripheral surface of the mounting concave portion 51 of the pulley 5, that is, the inner peripheral surface of the rim 55 of the pulley 5 is the outer ring 71 of the ball bearing 7.
The outer peripheral surface of the cylindrical portion 91 of the case 9 forms an inner ring 72, and the ball bearing 7 is mounted and fixed between the inner periphery of the pulley 5 and the outer periphery of the case 9. At this time, there is a gap between the bottom surface of the mounting recess 51 and the ball bearing 7.

In the large-diameter portion 32 of the shaft hole 3, the bush 10 fitted and fixed to the small-diameter portion 31 of the pulley 5 and the bush 10, between the main shaft 4 and the large-diameter portion 32, A mechanical seal 8 for sealing an annular gap between the large diameter portions 32 is mounted. The mechanical seal 8 may be a known one including a driven ring, a seat ring, a spring, and the like.

The shaft hole 3 is provided between the end face of the projection 52 of the pulley 5 of the cylindrical portion 91 of the case 9 and the end face of the mechanical seal 8.
The discharge hole 12 penetrating from the large diameter portion 32 to the outside is formed to be inclined toward the pump body 2.

The pump 1 thus configured transmits a driving force from an engine (not shown) to the main shaft 4 via a belt (not shown) attached to the outer periphery of the pulley 5 and the pulley 5. When the main shaft 4 rotates in a predetermined direction, the impeller 6 rotates to circulate the cooling water inside the pump body 2.

At this time, the ball bearing 7 attached and fixed between the inner peripheral surface of the pulley 5 and the outer peripheral surface of the case 9 holds the belt tension of the belt attached to the outer periphery of the pulley 5 and reduces the diameter of the shaft hole 3. Bush 1 fitted and fixed in the section 31
0 is receiving a radial load.

In the pump having the above-described structure, the ball bearing 7 and the mechanical seal 8 are separately provided on the outside and inside of the case 9 and at a distance from each other, so that the cooling water leaking from the mechanical seal 8 is provided. Hardly flows into the ball bearing 7. In the present embodiment, between the bottom surface of the mounting concave portion 51 of the pulley 5 and the ball bearing 7, between the bottom surface of the mounting concave portion 51 and the opening end surface of the cylindrical portion 91 of the case 9, and the outer peripheral surface of the convex portion 52 of the pulley 5 and the shaft hole. 3 has a gap between the large diameter portions 32 and the cylindrical portion 91 of the case 9.
A discharge hole 12 is provided at a position between the pulley 5 and the mechanical seal 8.
Therefore, the passage 13 is formed from the blade 54 of the pulley 5 to the discharge hole 12.

Therefore, when the pulley 5 rotates, the air flow generated by the blades 54 of the pulley becomes the air flow A passing through the passage 13, and the cooling water and gas leaked by the air flow A are forcibly discharged. It is discharged to the atmosphere via 12. That is, since the leaked cooling water does not flow into the ball bearing 7, deterioration of the ball bearing 7 does not occur, and rust water does not bite into the mechanical seal 8 unlike the related art.

Further, the ambient temperature is lowered by the flow A of the air, and the ball bearing 7 has a cooling effect.

Since the blades 54 of the pulley 5 have a compound curvature in order to smoothly generate the air flow A, machining by cutting requires a cost. Therefore, in the present embodiment, the processing cost is reduced by using resin injection molding. Further, the surface has good smoothness.

As described above, the environmental conditions of the ball bearing 7 and the mechanical seal 8 are improved, so that the life of the pump is improved.

In the above embodiment, the bearing using the ball bearing 7 has been described as an example. However, the present invention is not limited to the ball bearing, and other bearings such as a roller bearing may be used. Further, the seal member is not limited to the mechanical seal 8 but may be an oil seal or the like.

Further, the pump body and the shaft hole forming portion have been described as being separate from each other as an example.

[0032]

[0033]

According to the present invention, the pulley is rotatably held on a cylindrical portion via a bearing with the above configuration and operation. The leaked fluid does not flow out of the shaft hole of the pump body. Therefore, the leaked fluid does not enter the bearing and does not deteriorate. In addition, Pooh
Holes and blades communicating with the annular gap from the
By forming a passage for air flow through the outlet,
Fluid is forced out and fluid flows into the bearing
And the deterioration of the bearing is further suppressed. Ma
In addition, a cooling effect of the bearing can be expected.

Further, since the bearing does not deteriorate, rust water does not bite into the seal member as in the prior art.

As described above, the life of the pump can be improved by improving the environmental conditions of the bearing and the seal member.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a main part of a pump according to an embodiment of the present invention, and FIG. 1B is a perspective view of a pulley of FIG.

FIG. 2 is a longitudinal sectional view of a main part of a conventional pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Pump body 3 Shaft hole 31 Small diameter part 32 Large diameter part 4 Main shaft 5 Pulley 51 Mounting concave part 52 Convex part 53 Hole 54 Blade 55 Rim 6 Impeller 7 Ball bearing (bearing) 71 Outer ring 72 Inner ring 8 Mechanical seal (seal member) 9 Case 91 Cylindrical part 92 Fixed part 93 Recess 10 Bush 11 Pulley bush 12 Drain hole 13 Passage

Claims (1)

(57) [Scope of request for utility model registration] An axial hole is formed to penetrate the pump body.
A cylindrical part, a main shaft inserted into a shaft hole of the cylindrical part, an impeller fixed to the pump body inside side of the main shaft, and
A pulley fixed to the outside of the pump body, and the pulley fixed to the outer peripheral portion of the cylindrical portion;
And a bearing for rotatably holding the pump relative to the bearing in the axial direction and closer to the inside of the pump body than the bearing in the axial direction.
And seals an annular gap between the shaft hole of the cylindrical portion and the main shaft.
Wherein the pulley penetrates in the axial direction and communicates with the annular gap.
Hole, and a blade for generating a flow of air in the hole, wherein the cylindrical portion is provided between the bearing and the seal member in the axial direction.
To allow the annular gap to communicate with the outside of the pump body.
Pump comprising the Deana.