JP2001032791A - Water pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing seal device for a water pump capable of almost surely preventing cooling water or steam from invading into a shaft bearing, and simultaneously preventing grease in the bearing from flowing out. SOLUTION: A seal ring on the impeller side comprises an outer ring side seal ring 151 provided with a reinforcement ring, a first auxiliary lip 1512 and a main lip 1513 formed of elastic material such as rubber and synthetic resin, and a second auxiliary lip 1514 positioned on the outer diameter side of the main lip 1513, and a shaft side seal ring 152 comprising a first cylinder part 1521 engaged with a shaft body to be fixed, an intermediate part 1522 extended on the outer diameter side of it, and a second cylinder part 1523 subsequently extended in the axial direction to rotate with the shaft body, the main lip 1513 slide contacts with an outer circumferential surface of the first cylinder part 1521 of the shaft side seal ring 152, the first auxiliary lip 1512 slide contacts with an outer circumferential surface of a rotary member on the axial direction inner side of the main lip 1513, the second auxiliary lip 1514 slide contacts with the shaft side seal ring 152 on the outer diameter side of the main lip 1513, and an outer diameter side extended part of the shaft side seal ring 152 composes a labyrinth seal with the outer ring side seal ring 151 or an outer ring 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal device for a water pump suitable for a water-cooled engine of an automobile, a bearing and a water pump, and more specifically, water, water vapor and the like enter a bearing for supporting a rotating shaft of a water pump. The present invention relates to a bearing seal device for a water pump, a bearing for a water pump, and a water pump, which prevent the grease from flowing out of the bearing at the same time.

[0002]

2. Description of the Related Art In general, a water pump for pumping cooling water for an engine is formed by supporting a rotating shaft, to which an impeller is fixed, on a casing by a plurality of bearings (rolling bearings) spaced at an axial direction. The bearing is a sealed bearing with a seal in order to prevent the cooling water from entering the bearing as in the case of a normal pump.

[0003]

However, since the running and stopping of the engine are repeated, the sealed bearing with the seal is repeatedly heated and cooled, and expands and contracts repeatedly, thereby easily impairing the sealing function.

[0004] In particular, steam generated by heating the engine cooling water during operation of the engine is likely to pass through the seal device and enter the bearing. Lubricants such as grease for lubricating the bearings are usually stored in the bearings that support the pump rotating shaft. However, when cooling water and water vapor enter the bearings as described above, the lubrication performance of the lubricants is particularly high. ,
There is a danger that poor durability results in poor lubrication, resulting in an increase in rotational resistance of the rotary shaft of the pump, seizure and the like.

A conventional bearing seal device is known, for example, from Japanese Unexamined Utility Model Publication No. 62-66026, which is disclosed in FIG. 2, FIG. 3 and FIG. As described above, the outer periphery of the bearing is fixed to the outer ring end, and a plurality of radial lips formed on the inner periphery are sealed by a seal body having a structure in which the radial lip is in sliding contact with the outer peripheral surface of the shaft. However, in this type of conventional technology, since the seal is provided only by the radial lip formed on the inner peripheral portion, steam generated by heating the engine cooling water during engine operation enters the bearing. Cheap.

[0006] Japanese Patent Application Laid-Open Publication No. Sho 60-107459 is also known, but the prior art discloses an outer ring having a plurality of radial contact lips, and a metal contacting a seal lip of the outer ring. A main seal lip of the outer ring is provided on the small diameter side, and an auxiliary seal lip is provided on the large diameter side so as to protrude outward.The inner ring has a smaller diameter than the outer ring and has a plurality of axial directions. In this structure, the main seal lip and the auxiliary seal lip are brought into contact with the respective outer peripheral surfaces of the inner ring in the axial direction, and the auxiliary seal lip contacts the inner ring at an angle of 45 °. But,
In this type of prior art, the double sealing structure of the main seal lip and the auxiliary seal lip prevents the steam generated by heating the engine cooling water during operation of the engine from entering the bearing. Was effective, but the main seal lip protruded outwardly, so that it was insufficient to prevent grease from flowing out of the bearing.

Japanese Patent Application Laid-Open No. 61-112119 is also known, but in the prior art, an outer ring having a plurality of seal lips and a U-shape which is in contact with the seal lip of the outer ring is provided. The outer lip of the outer ring is in contact with the outer periphery of the small diameter portion of the inner ring, and the inward lip is in contact with the inner periphery of the large diameter portion. However, in this prior art, since the outward lip protrudes outward, it is insufficient to prevent the grease from flowing out of the bearing.

Further, as a conventional technique, Japanese Utility Model Application Laid-Open No. 61-11 / 1986
No. 2119 is also known. However, the sealing device disclosed in Japanese Utility Model Application Laid-Open No. 61-112119 has a cylindrical portion fitted and fixed to a rotating body, an intermediate portion extending outwardly from the cylindrical portion, and a large portion extending axially following the intermediate portion. And a seal body including an outer lip in contact with the outer periphery of the cylindrical portion of the sleeve, and an inward lip in sliding contact with the inner periphery of the large-diameter cylindrical portion of the sleeve. is there. However, the prior art is not a triple seal structure, but insufficient to prevent grease from flowing out of the bearing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to almost certainly prevent cooling water, water vapor, and the like from entering a bearing. It is another object of the present invention to provide a water pump bearing seal device, a water pump bearing, and a water pump that prevent grease from flowing out of the bearing.

[0010]

The technical means for solving the above problems are as follows. A seal ring having a plurality of rows of rolling elements between an outer ring fixed to a casing and a shaft having a pulley on one end and an impeller on the other end, and fixed to both ends of the outer ring In the bearing seal device for a water pump, the seal ring on the impeller side of the seal ring is a first auxiliary lip formed of a reinforcing ring and an elastic body such as rubber or synthetic resin. An outer ring side seal ring including a main lip, a second sub lip located on the outer diameter side of the main lip, and extending outward in the axial direction; a first cylindrical portion fitted and fixed to the shaft body; A shaft-side seal ring having an intermediate portion extending more outwardly than this and a second cylindrical portion extending in the axial direction following the intermediate portion, at least the main lip of the first cylindrical portion of the shaft-side seal ring is provided. Contact the outer peripheral surface or the outer peripheral surface of the shaft, and There is that which forms the seal portion of the contact or non-contact between the second cylindrical portion of the shaft seal ring. Further, as a water pump bearing, an outer ring fixed to a casing, a rotating shaft having a pulley on one end and an impeller on the other end, and a plurality of shafts disposed between the outer ring and the shaft. A row of rolling elements, a reinforcing ring, a first sub lip and a main lip formed of an elastic body such as rubber or synthetic resin, and a second sub lip located on the outer diameter side of the main lip and extending outward in the axial direction. A first cylindrical portion fitted and fixed to the outer ring side seal ring and the shaft body having a lip, an intermediate portion extending outwardly from the first cylindrical portion, and a second cylindrical portion extending axially following the intermediate portion; A shaft-side seal ring having an impeller-side sealing device, wherein at least the main lip is in contact with the outer peripheral surface of the first cylindrical portion of the shaft-side seal ring, or is in contact with the outer peripheral surface of the shaft body; (2) The contact or non-contact between the secondary lip and the second cylindrical portion of the shaft side seal ring Is that which forms the seal portion of the touch. Further, as the water pump for water cooling of an automobile, the above-described water pump bearing having an impeller at an end and fixed to a casing is used.

[0011]

According to the structure of the present invention, the main lip is in sliding contact with the outer peripheral surface of the first cylindrical portion of the shaft side seal ring or the outer peripheral surface of the shaft body, thereby preventing foreign matter from entering from the outside. The auxiliary lip prevents the grease in the bearing from leaking,
By forming the contact portion or the non-contact seal portion between the second sub-lip and the second cylindrical portion of the shaft-side seal ring, it is possible to prevent cooling water and water vapor from entering the bearing.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the technical means of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of an essential part showing an example of a water pump incorporating the device of the present invention, and FIG. 2 is an enlarged sectional view of an essential part of FIG.

Reference numeral 10 denotes the whole of a rolling bearing for a water pump. Reference numeral 101 denotes an outer ring of the rolling bearing 10. The outer ring 101 is fixed to an inner peripheral surface of the casing 11, and a plurality of rows of raceway grooves 1011 are formed on the inner peripheral surface of the outer ring 101, and seal grooves 1012 are formed at both ends thereof. Are formed.

Reference numeral 12 denotes a shaft inserted into the outer ring 101 via a plurality of rows of rolling elements 13, and one end of the shaft 12 is provided with a pulley.
130 and an impeller 14 at the other end (see FIG. 1).
reference). 121 is a shaft body facing the raceway groove 1011 of the outer ring 101
12 is a raceway groove formed on the outer peripheral surface of FIG.

Reference numeral 15 denotes an outer ring side seal ring 151 and an axial side seal ring fixed to the seal groove 1012 of the outer ring 101 on the impeller 14 side.
An outer ring side seal ring 151 of the seal device 15 has a reinforcing ring 1511 and at least an axially inward first sub-lip 1512 formed of an elastic body such as rubber or synthetic resin and an axially outer seal ring 151. Oriented main lip 1513 and the main lip 15
13 and a second sub lip 1514 which is located on the outer diameter side and extends outward in the axial direction. In addition, the reinforcing ring 1511
One end 1511a is fixed to the outer ring 101, and the other end 1511c extends toward the shaft via an intermediate portion 1511b formed in a cylindrical shape (see FIG. 2).

Next, the shaft-side seal ring 152 is formed by using a special steel plate for corrosion resistance, for example, a stainless steel plate, and has a substantially U-shaped cross section, and is tightly fitted to the shaft body 12. It is composed of a first cylindrical portion 1521 to be fixed, an intermediate portion 1522 extending radially outward from the first cylindrical portion 1521, and a second cylindrical portion 1523 subsequently extending axially inward.

The first sub lip 1512 of the outer ring side seal ring 151 is provided inward in the axial direction, and the outer peripheral surface 122 of the shaft body 12 is provided.
The main lip 1513 is provided in the axially outward direction, and is in contact with the outer peripheral surface 1524 of the first cylindrical portion 1521 of the shaft-side seal ring 152 to form a seal portion. A seal is formed between the ring 152 and the inner peripheral surface 1525 of the second cylindrical portion 1523.

In the above embodiment, the outer ring side seal ring 151 is used.
The first sub lip 1512 is provided inward in the axial direction to
The grease in the bearing is prevented from leaking by contacting the outer peripheral surface 122 of the shaft, and the main lip 1513 is brought into contact with the outer peripheral surface 1524 of the first cylindrical portion 1521 of the shaft side seal ring 152 so that foreign matter from outside can be prevented. A seal portion is formed that serves as an intermediate seal for preventing intrusion. In this embodiment, since the first sub lip 1512 is in contact with the outer peripheral surface 122 of the shaft 12, the grease in the bearing is prevented from leaking from the fitting surface between the shaft side seal ring 152 and the shaft 12. It is also effective in preventing it. Also, the end surface 1526 of the second cylindrical portion 1523 and the outer ring side seal ring
A labyrinth seal with a clearance C is formed between the side walls 1515 of the base 151.

The second auxiliary lip of the outer ring side seal ring 151
A seal portion serving as an external seal is formed by contacting (or non-contacting) the inner peripheral surface of the second cylindrical portion 1523 of the shaft side seal ring 152 with the shaft side seal ring 152.
The cooperation between the intermediate portion 1522 and the second cylindrical portion 1523 makes it possible to shake off the cooling water and water vapor that tend to enter the bearing.

In short, the bearing seal device of the present invention is formed by the first sub lip 1512 contacting the outer peripheral surface 122 of the shaft body 12 and the main lip 1513 contacting the outer peripheral surface 1524 of the first cylindrical portion 1521. Seal portion and the second sub lip 1514
A double structure of the seal portion formed by contact with the inner peripheral surface of the cylindrical portion 1523 is formed.

The second sub lip 15 of the outer ring side seal ring 151
14 has an arm 1514a and a protrusion 1514b provided at the tip of the arm 1514a. The arm 1514a extends inward in the axial direction in parallel with the second cylindrical portion 1523 of the shaft-side seal ring 152. 2 cylindrical part
An axial seal gap is formed between the gap and the seal 1523. Also,
A protrusion 1514b provided at the tip of the arm 1514a is in contact with the inner peripheral surface of the second cylindrical portion 1523. Further, even if the contact state is changed to the non-contact state due to wear, since a labyrinth seal is formed by the axial seal gap, intrusion of cooling water, water vapor, and the like is prevented.

Further, the second cylindrical portion 15 of the shaft side seal ring 152
23 extends inward in the axial direction from the end of the outer ring 101 and has an end face
By forming a labyrinth seal with a clearance C between 1526 and the side wall 1515 of the outer ring side seal ring 151, the intrusion of cooling water and water vapor in the water pump can be suppressed.

The reinforcing ring 1511 of the outer ring side seal ring 151
Since one end 1511a is fixed to the outer ring 101 and the other end 1511c extends toward the shaft via an intermediate portion 1511b formed in a cylindrical shape, the other end 1511c is axially outside the one end 1511a. And the other end 1511c reinforces the first sub lip 1512. Therefore, the first sub lip 1512 can slidably contact the outer peripheral surface 122 of the shaft body 12 with a tight force, and it is not necessary to use a garter spring or the like.

FIG. 3 is an enlarged sectional view of a main part of a second embodiment of the present invention.
The second cylindrical portion 1523 is provided on a flange portion 1527 extending radially outward. Therefore, the side wall 1515 of the outer ring side seal ring 151
A labyrinth seal is formed by the clearance C1 between the flange portion 1527 and the flange portion 1527. The operation and effect are substantially the same as those of the first embodiment, and the description thereof is omitted.

FIG. 4 is an enlarged sectional view of a main part of a third embodiment of the present invention. The point different from the second embodiment is that the second embodiment further extends radially outward of the second cylindrical portion 1523 of the shaft-side seal ring 152. It is on the flange 1527. Therefore, a labyrinth is formed by the clearance C2 between the outer peripheral end of the flange 1527 and the inner peripheral surface 1014 of the end of the outer ring 101. The operation and effect are substantially the same as those of the second embodiment, and the description thereof is omitted.

FIG. 5 is an enlarged sectional view showing a main part of a fourth embodiment of the present invention, which differs from the first embodiment in that a first auxiliary lip 1612 and a main lip of an outer ring side seal ring 161 having a reinforcing ring 1611 are provided.
When both lips 1613 are brought into contact with the outer periphery of the first cylindrical portion 1621 of the shaft-side seal ring 162 tightly fitted and fixed to the shaft body 12, and the second cylindrical portion 1623 of the shaft-side seal ring 162 is Side wall 1628 of flange portion 1627 extending outward and end surface of outer ring 101
A labyrinth seal is formed by a gap C3 between the labyrinth seal and the gap between the labyrinth seal 103 and the gap 1013.

Accordingly, a seal portion is formed between the main lip 1613 and the outer peripheral surface 1524 of the first cylindrical portion 1621, and the labyrinth seal is formed between the side wall 1628 of the flange portion 1627 and the end surface 1013 of the outer ring 101.
It is formed by a gap C3. The flange 16
27 extends radially outward from the second cylindrical portion 1623,
The outer ring side seal ring 161 is covered in a cover shape. Therefore, it is possible to prevent the cooling water or the like from directly spraying on the outer ring side seal ring. The operation and effect are substantially the same as those of the first embodiment, and the description thereof is omitted.

FIG. 6 is an enlarged sectional view of a main part showing a fifth embodiment of the present invention. The difference from the first embodiment is that a reinforcing ring 1711 is provided.
The second sub lip 1714 of the outer ring side seal ring 171 having an axial direction extends outward in the axial direction, and at a position corresponding to the second sub lip 1714,
A second cylindrical portion 1724 made of an elastic material such as rubber or synthetic resin is formed around an outer peripheral edge portion 1723 of the shaft-side seal ring 172, and an inner peripheral surface of the second cylindrical portion 1724 and the second sub lip are formed. 1714
A non-contact type sealing portion having a clearance C4 is provided between the sealing portion and the outer peripheral surface. The second cylindrical portion 1724 is formed with an inwardly inclined end surface 1725 that does not contact the outwardly inclined end surface 1715 of the second sub lip 1714.

Further, a slight clearance C5 is formed between the end surface 1726 of the second cylindrical portion 1724 of the shaft side seal ring and the side wall 1716 of the outer ring side seal ring 171. Therefore, a labyrinth seal is formed by the second sub-lip of the outer ring side seal ring, the clearance C4, C5 between the end face of the non-contact type seal portion of the shaft side seal ring and the end face of the seal portion of the shaft side seal ring and the side wall of the outer ring seal ring. And
Intrusion of cooling water, steam, and the like can be prevented. Reference numeral 1712 denotes a first sub lip, and reference numeral 1713 denotes a main lip.

FIG. 7 is an enlarged sectional view of a main part of a sixth embodiment of the present invention. The difference from the first embodiment is that the second sub lip 1814 of the outer ring side seal ring 181 having the reinforcing ring 1811 is pivoted. A second cylindrical portion 1824 made of an elastic material such as rubber or synthetic resin around an outer peripheral edge 1823 of the shaft side seal ring 182 and a lip at a position corresponding to the second sub lip 1814. Is formed, and is provided with both a non-contact type seal portion and a contact type seal portion 1825 having a clearance C6 between the inner peripheral surface 1525 of the second cylindrical portion 1824 and the outer peripheral surface of the second auxiliary lip 1814. is there. The second cylindrical portion 1824 includes an outer inclined surface 1816 of the second sub lip 1814 and a corresponding inner inclined surface 1816.
A labyrinth seal is formed by the clearance C6 of 26.
The second cylindrical portion 1824 has a lip at the peripheral edge thereof in contact with the inner peripheral surface 1014 at the end of the outer race 101 to form a seal.

FIG. 8 is an enlarged sectional view of a main part of a seventh embodiment of the present invention, which differs from the first embodiment in that a shaft-side seal ring is provided.
152, a radially outward contact-type seal portion 1528 made of an elastic material such as rubber or synthetic resin is provided around a flange portion 1527 in which the outer peripheral edge of the second cylindrical portion 1523 is extended radially outward. is there. The lip of the contact-type seal portion 1528 contacts the inner peripheral surface 1014 of the end of the outer ring 101 to form a seal.

FIG. 9 is an enlarged sectional view of an essential part showing an eighth embodiment of the present invention. The difference from the seventh embodiment is that a shaft side seal ring is provided.
152, a radially outward contact-type seal portion 1529 made of an elastic material such as rubber or synthetic resin is provided around a flange portion 1527 in which the outer peripheral edge of the second cylindrical portion 1523 is extended radially outward. is there. Accordingly, the tip of the contact-type seal portion 1529 contacts the end face 1013 of the outer race 101 to form a seal.

FIG. 10 is an enlarged sectional view of a main part of a ninth embodiment of the present invention.
2 is a first cylindrical portion 1530 tightly fitted and fixed to the shaft body 12,
An intermediate portion 1531 extending to the outside diameter side inward in the axial direction,
Subsequent to this, the second cylindrical portion 1532 extending inward in the axial direction forms a substantially Z-shaped cross section. Accordingly, both the first sub lip 1512 and the main lip 1513 of the outer ring side seal ring 151 are in contact with the outer peripheral surface of the shaft body 12 and the end surface 1533 of the second cylindrical portion 1532 and the side surface 1515 of the outer ring side seal ring 151. A labyrinth seal is formed by the clearance C7.

[0034]

As described in each of the embodiments described above, the double sealing structure of the sealing portion can exert a low torque and strong sealing function without increasing the axial space. In particular, it functions more effectively due to the synergistic effect of the slinger action of the shaft side seal ring with the rotation of the shaft and the second sub lip.

When a contact portion or a non-contact seal portion is formed between the tip of the second cylindrical portion of the shaft side seal ring and the mating member as in the embodiment, water or steam from the outside is formed by the sealing effect. It works more effectively to prevent intrusion of foreign matters such as.

In particular, the main lip is slidably in contact with the outer peripheral surface of the first cylindrical portion of the shaft-side seal ring or the outer peripheral surface of the shaft body, thereby preventing intrusion of foreign matter from the outside and being formed inward in the axial direction. The first sub-lip prevents the grease in the bearing from leaking, and the second sub-lip forms a contact portion or a non-contact seal portion with the second cylindrical portion of the shaft side seal ring, so that the inside of the bearing is reduced. It is possible to prevent cooling water and water vapor from entering the air. Therefore, it is possible to remarkably prolong the life of the bearing, and also to achieve the effects and advantages unique to the present invention, such as the improvement of the reliability of the water pump itself.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a water pump incorporating the device of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing a third embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a fourth embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a fifth embodiment of the present invention.

FIG. 7 is an enlarged sectional view of a main part showing a sixth embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part showing a seventh embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a main part showing an eighth embodiment of the present invention.

FIG. 10 is an enlarged sectional view of a main part showing a ninth embodiment of the present invention.

[Explanation of symbols]

 101: Outer ring 11: Casing 12: Shaft 13: Rolling element 130: Pulley 14: Impeller 15: Seal device 151,161,171,181: Outer ring side seal ring 1511,1611,1711,1811: Reinforcement ring 1512,1612,1712: First sub lip 1514, 1714, 1814: second auxiliary lip 1513, 1613, 1713: main lip 152, 162, 172, 182: shaft side seal ring 1521, 1530, 1621, 1721: first cylindrical portion 1522, 1531, 1622, 1722: intermediate portion 1523, 1532, 1623,1724,1824: 2nd cylindrical part

Claims (3)

[Claims] A plurality of rows of rolling elements are provided between an outer ring fixed to a casing and a shaft body having a pulley on one end side and an impeller on the other end side, and at both ends of the outer ring. In a bearing seal device for a water pump in which a shaft and a shaft are sealed by a fixed seal ring, the seal ring on the impeller side of the seal ring is formed of a reinforcing ring and an elastic body such as rubber or synthetic resin. An outer ring side seal ring including a first sub lip, a main lip, and a second sub lip located on the outer diameter side of the main lip and extending outward in the axial direction; A shaft-side seal ring having one cylindrical portion, an intermediate portion extending outwardly from the cylindrical portion, and a second cylindrical portion extending in the axial direction following the cylindrical portion, at least the main lip of the shaft-side seal ring is provided. Contact the outer peripheral surface of the first cylindrical portion or the outer peripheral surface of the shaft , Wherein the second sub-lip forms a contact portion or a non-contact seal portion with the second cylindrical portion of the shaft-side seal ring. 2. An outer ring fixed to a casing, a rotating shaft provided with a pulley at one end and an impeller at the other end, and a plurality of rows of rollers arranged between the outer ring and the shaft. A moving body, a reinforcing ring, a first sub lip and a main lip formed of an elastic body such as rubber or synthetic resin, and a second sub lip located on an outer diameter side of the main lip and extending axially outward. A first cylindrical portion fitted and fixed to the outer ring side seal ring and the shaft body provided;
An impeller-side sealing device including a shaft-side seal ring having an intermediate portion extending more outwardly than this and a second cylindrical portion extending in the axial direction following the intermediate portion, at least the main lip is provided. A seal portion that is in contact with the outer peripheral surface of the first cylindrical portion of the shaft-side seal ring, or that is in contact with the outer peripheral surface of the shaft body, and in which the second sub lip contacts or does not contact the second cylindrical portion of the shaft-side seal ring. A bearing for a water pump, characterized by forming: 3. A water pump for water cooling of an automobile, wherein the water pump bearing has an impeller at an end and is fixed to a casing.