JP2550701Y2 - Water pump bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a water pump bearing for an automobile.

[0002]

2. Description of the Related Art As a water pump for an automobile, an impeller is provided at one end of a pump shaft, a pulley is provided at the other end, and the impeller is rotated by driving the pulley. What circulates cooling water is known. In this water pump, a water pump bearing is press-fitted into a pump housing fixed to the engine body. This water pump bearing
An outer ring is rotatably attached to a pump shaft via a rolling element.An impeller is fixed to one end of the pump shaft in the engine body inner direction, and a pulley is fixed to the other end. I have. Then, the intermediate portion between the outer ring and the impeller, pump, is a mechanical seal to seal between the Ujingu and the pump shaft is provided. As shown in FIG. 8, the gap between the impeller end 51c of the outer race 51a of the water pump bearing 51 and the pump shaft 52 is sealed by a rubber seal member 53 reinforced by a metal ring 53b.

However, in the above-described water pump, when the sealing property of the mechanical seal is deteriorated due to aging or the like,
Cooling water enters the outer ring 51a from the impeller side, and the entered cooling water contacts a portion of the pump shaft 52 that comes into contact with the seal member 53, and rust is generated at the portion. Then, the radial sealing lip 53a of the seal member 53 comes into contact with this rusted portion and is worn out early, and the seal member 53
A gap is formed between the pump shaft 52 and the pump shaft 52, and moisture enters the inside of the bearing through the gap. As a result, there is a problem that the grease filled in the bearing deteriorates or rust occurs in the bearing, so that the water pump bearing 51 breaks down and shortens the life of the water pump.

[0004] In addition, when water condensed on the pump shaft 52 is scattered by the rotation of the pump shaft 52 and splashes near the radial sealing lip 53a, or when water vapor has passed through the mechanical seal, the sealing member 53 of the pump shaft 52 is also used.
Rust was generated at the portion in contact with, causing the same problem as described above. For this reason, improvement of the rubber forming the seal member 53 and use of an oil seal type seal member as the seal member have been proposed, but none of them has shown a sufficient effect.

[0005] Even if the seal member 53 is not worn and is normal, it is difficult to prevent water from entering the inside of the bearing if a large amount of water is applied to the vicinity of the radial sealing lip 53a. A similar problem occurred. On the other hand, in the sealing member 53, since the radial sealing lip 53a extends outward of the bearing,
The radial sealing lip 53a is separated from the pump shaft 52 by grease leaking from the inside of the bearing, and the grease leaks easily. As a result, the friction between the rolling element 54 and the pump shaft 52 increases, and there has been a problem that the bearing life is shortened.

[0006] Therefore, an object of the present invention is to provide a water pump bearing capable of improving the waterproofness of the water pump bearing and obtaining a long life water pump. Another object of the present invention is to provide a water pump bearing that can prevent leakage of grease filled in the bearing.

[0007]

In order to solve the above-mentioned problems, a water pump bearing according to the present invention is provided with an outer ring of a bearing on a pump shaft having an impeller at one end and a pulley at the other end. A water pump bearing that is rotatably mounted via a seal member that seals the inside of the bearing at both ends of the outer ring, wherein the seal member of the seal member that is disposed near the impeller, A cylindrical portion tightly fitted so as to be integrally rotatable with the pump shaft, a flange portion extending radially outward of the pump shaft, and a flange portion
A corrosion-resistant slinger having a short cylindrical portion extending in the same direction as the cylindrical portion from the outer peripheral edge of the slinger, and a seal member for sealing between the cylindrical portion of the slinger and the outer ring, and an inner peripheral portion of the seal member. Sliding contact with the outer peripheral surface of the cylindrical part of the slinger
A plurality of radial sealing lips, all of which extend toward the inside of the bearing, are formed, and one of the sealing member and the flange portion of the slinger is provided with a side sealing lip for sealing a gap therebetween. It is characterized by the following.

Further, the cylindrical portion of the upper Symbol slinger is preferably fitted in close contact with the reduced diameter portion formed in the pump shaft.

[0009]

SUMMARY OF According to Wotaponbu bearing of the above construction, in such case the sealing of the main <br/> Kanikarushiru moisture deteriorated intrudes, the moisture, the flange portion of the slinger and
The short cylinder portion and the side sealing lip are prevented from directly hitting near the contact portion between the cylindrical portion of the slinger and the seal member. Therefore, penetration of moisture into the bearing is suppressed. In addition, even when moisture enters near the contact portion between the cylindrical portion and the sealing member, or even when dew condensation occurs, the moisture is centrifugally generated by the rotation of the slinger, and the sealing is performed along the flange portion of the slinger. It is swept out of the body. Furthermore, even when the rotation is stopped, the slinger has corrosion resistance, so that it does not rust. Therefore,
Premature wear of the seal member due to contact with rust is prevented.

In addition, there are a plurality of radial sealing lips formed on the inner peripheral portion of the seal member, and all the distal ends of the radial sealing lips extend toward the inside of the bearing. of the the penetration of moisture it can be more reliably prevented co, by grease to be leaked from the bearing interior, white tightening the cylindrical portion of the radial sealing lip and the slinger but is increased. In addition, both
The direction in which the radial sealing lip extends
As a result, the slinger is assembled
When rolling in, the radial sealing lip is rolled up.
Grease from inside the bearing caused by this entanglement
Can be prevented from leaking.

Further, when the cylindrical portion of the slinger is tightly fitted to a reduced diameter portion formed on the pump shaft,
Since the distance between the outer ring and the pump shaft can be increased,
The degree of freedom in designing the seal body is increased, and the peripheral speed of the inner diameter of the seal member can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a partially cutaway view of a water pump A provided with the water pump bearing 3 of the present invention. In the water pump A, a water pump bearing 3 composed of an outer ring 31, a rolling element 32, and a pump shaft 4 is press-fitted into a pump housing 2 fixed to an engine body. An impeller 5 is fixed to one end 4a of the pump shaft 4 in the engine body inward direction, and a pulley 6 is fixed to the other end 4b.

A mechanical seal 7 for sealing a space between the pump housing 2 and the pump shaft 4 is provided between the outer ring 31 and the impeller 5.
The end 31a of the outer ring 31 on the impeller 5 side and the pump shaft 4
A seal body 1 for sealing a gap between the two is provided between the two. As shown in FIG. 1, the seal body 1 has a cylindrical part 12
b , the end of the cylindrical portion 12b on the mechanical seal 7 side
Flange portion 12 extending radially outwardly of Luo pump shaft 4
a from the outer peripheral edge of the flange portion 12a
A short cylindrical portion 12e extending in the same direction as the portion 12b .
An annular slinger 12 made of a corrosion-resistant metal such as stainless steel, and an annular seal member 11 for sealing between the cylindrical portion 12b of the slinger 12 and the outer ring 31 are provided.

The seal member 11 is made of rubber, and has a metal ring 11d for reinforcement attached thereto. Further, the outer peripheral edge 11a is fixed to the outer ring 31.
Two radial sealing lips 11 b, 11 slidably contacting the cylindrical portion 12 b of the slinger 12 are provided on the inner peripheral edge.
e is formed. The distal ends of these two radial sealing lips 11b and 11e are located inside the bearing (rolling element 3).
(In two directions), and the grease that tends to leak from the inside of the bearing increases the interference with respect to the cylindrical portion 12b.

Further, a side sealing lip 11c is formed on the seal member 11, and a tip of the side sealing lip 11c is slidably adhered to a flange portion 12a of the slinger 12. The side sealing lip 11c extends obliquely outward so that the interference with the flange portion 12 increases when a force is applied from the outside of the bearing.

[0016] If the sealing member 1 of the above configuration, in such a case where menu Kanika <br/> Lucile 7 moisture sealability is deteriorated has entered, from the water hits directly near the radial sealing lips 11b, Flange part 12a of slinger 12
And short cylindrical portion 12e, and side sealing lip 1
1c, it is possible to suppress the entry of moisture into the bearing. In addition, when a force is applied to the side sealing lip 11c from the outside of the bearing, the interference of the side sealing lip 11c with respect to the flange portion 12a increases, so that the intrusion of moisture into the inside of the bearing is more reliably prevented. be able to. In addition, even when moisture enters near the radial sealing lip 11b or when dew condensation occurs, the moisture is centrifugally generated by the rotation of the slinger 12 so that the moisture flows along the flange portion 12a and the short cylindrical portion 12e of the slinger 12. Then, it is swept out of the seal body 1. Further, even when the rotation is stopped, the slinger 12 has corrosion resistance, so that there is no possibility of rusting. Therefore, it is possible to prevent the seal member 11 from being worn early due to contact with rust. Furthermore, the above slinger 1
The rigidity of the slinger 12 is increased by the two short cylindrical portions 12e.
Prevention of deformation and thin and light weight
It is possible to improve the waterproof
Can be.

The radial sealing lip 11
b and 11e extend toward the inside of the bearing, and the grease which tends to leak from the inside of the bearing increases the interference of the radial sealing lips 11b and 11e with respect to the cylindrical portion 12b of the slinger 12. Leakage of grease from inside can be prevented. The material for forming the slinger 12 is not particularly limited as long as it has corrosion resistance. In addition to the above stainless steel, a steel material plated with a corrosion-resistant metal may be used. Further, it is preferable to apply grease to the outer peripheral surface of the seal member 11 in order to enhance the adhesion to the seal member 11.

The seal 1 of the water pump bearing 3 according to the present invention is not limited to the above embodiment. For example, as shown in FIG. 3, the slinger 12 includes the short cylindrical portion 12 formed on the outer peripheral edge 12 c of the flange portion 12 a.
e may be omitted.

In each of the embodiments shown in FIGS. 1 and 3, after attaching the seal member 11 to the outer race 31, the slinger 12 is pressed into the pump shaft 4 to combine the seal member 11 and the slinger 12. However, since the two radial sealing lips 11b and 11e extend inward of the bearing, the direction in which the two radial sealing lips 11b and 11e extend is the same as the mounting direction of the slinger 12. When incorporating the slinger 12, the radial sealing lips 11b, 11e
Does not occur, and leakage of grease from the inside of the bearing due to the winding can be prevented.

Further, as shown in FIG. 4, one of the two radial sealing lips 11f and 11g may be extended outward of the bearing. In this case, the radial sealing lip 11g With 11 g, water can be more reliably prevented from entering the bearing. However, in this case, as shown in FIGS. 1 and 3, when the slinger 12 is installed after the sealing member 11 is installed in the outer race 31, the radial sealing lip 11g is entangled to cause the initial lip shape. Since the seal member 11 and the slinger 1 may not be maintained.
It is preferable that the two are combined into the outer race 31 and the pump shaft 4 at the same time in a state where they are combined in advance. In order to simultaneously incorporate the seal member 11 and the slinger 12 in a state of being integrally combined in advance, the pump housing 2 and the flange portion 1 of the slinger 12 are required.
Since it is necessary to secure a gap S for pressing the seal member 11 inward of the bearing between the outer peripheral edge of the flange 2a and the flange portion 12a, the height h of the flange portion 12a is reduced.

Further, as shown in FIG.
Instead of the side sealing lip 11c provided in
A side sealing lip 12d may be extended from the outer peripheral edge 12c of the flange portion 12a of the slinger 12 so that the leading end contacts the seal member 11. In this case, it is preferable that the side sealing lip 12d is brought into contact with a metal ring 11d for reinforcing the sealing member 11.

FIG. 6 shows still another embodiment of the present invention. The difference between the water pump bearing 3 shown in the figure and the above embodiment is that the pump shaft 4 is provided with a reduced diameter portion 4a having a diameter smaller than the maximum outer diameter portion where the rolling elements 32 are disposed, and the reduced diameter portion 4a is provided on the reduced diameter portion 4a. The point is that the cylindrical portion 12b of the slinger 12 is fitted. According to the above-described embodiment, the interval between the outer ring 31 and the pump shaft 4 can be increased, so that the degree of freedom in designing the seal 1 can be increased. For example, when it is necessary to shorten the height h of the flange portion 12a in order to simultaneously incorporate the seal member 11 and the slinger 12 in a state where the seal member 11 and the slinger 12 are integrally combined in advance, the distance between the outer ring 31 and the pump shaft 4 is reduced. Due to the narrowness, the height h of the flange portion 12a cannot be sufficiently secured, and the flange portion 12a
Even when the short tube portion 12e cannot be formed, the height h of the slinger 12 can be secured by the reduced diameter portion 4a, and the short tube portion 12e can be formed. Further, since the amount of grease to be filled in the bearing can be increased by the provision of the reduced diameter portion 4a, grease deterioration can be delayed. Further, since the peripheral speed of the inner diameter of the seal body 1 can be reduced, the wear resistance of the seal body 1 can be improved. Therefore, the life of the water pump can be further extended, and a space-saving water pump bearing can be obtained.

The water pump bearing according to the present invention shown in FIG. 1 and the conventional water pump bearing shown in FIG. 8 were subjected to the following steam test. Evaluation Test Each of the above seals was incorporated into the automotive water pump shown in FIG. 2, and the end face of the seal on the impeller side was placed in a steam atmosphere, and the water pump was operated at 6000 rpm.
The rotation was performed at pm, and the time was measured until moisture entered from the seal into the bearing. The intrusion of moisture into the bearing was detected by conduction between an electrode provided near the seal member inside the bearing and the outer ring of the water pump bearing.

A Weibull plot was performed on the test data. FIG. 7 shows the results. 7 that the sealing body of the water pump bearing according to the invention B ₁₀ life and B ₅₀
Life (respectively, the cumulative failure probability the time until 10% and 50%) were examined, B ₁₀ life of the conventional water pump bearing seal is 96 hours, B ₅₀ life was 198 hours . On the other hand, B ₁₀ life 343 hours of the seal member of the water pump bearing according to this invention, B ₅₀ life is 725 hours, was found to be 3.6 times that of conventional respectively.

From the above, it can be seen that the water pump bearing according to the present invention has better water resistance than the conventional one.

[0026]

As described above, according to the invention] According to the water pump bearing according to this invention, the water passing through the main Kanikarushiru is, near the contact portion between the cylindrical portion and the seal member of the slinger
Directly contact the slinger flange and short tube,
As well as blocked by the side sealing lip . Therefore, penetration of moisture into the bearing is suppressed. Furthermore, when moisture enters near the contact portion between the above-mentioned cylindrical portion and the seal member, or even when dew condensation occurs, along with the rotation of the slinger, the moisture is centrifugally applied to the flange portion and the short cylinder portion of the slinger. Along, it is swept out of the seal body.
Further, even when the rotation of the bearing is stopped, since the slinger has corrosion resistance, there is no possibility of rusting. Therefore, it is possible to prevent the seal member from being worn out early, and it is possible to reliably prevent moisture from entering the inside of the bearing for a long period of time, and to extend the life of the water pump.

Further, the radial sealing lip, because plural rows, co the penetration of moisture into the bearing can be more reliably prevented, radial sealing lip, because all extend toward the side in the bearing, Grease leaking from the inside of the bearing increases the interference between the radial sealing lip and the cylindrical portion of the slinger, thereby preventing grease from leaking from the inside of the bearing. Moreover, the direction in which each radial sealing lip extends
Is in the same direction as the slinger mounting direction.
As a result, when incorporating slingers,
The bearing is not entangled in the bearing
Grease can be prevented from leaking from the part. Therefore, the life of the water pump can be further extended. In addition, the short tube at the outer periphery
Since the rigidity of the nga itself can be increased, its deformation
It is possible to reduce the thickness and weight of
Can be further increased.

Furthermore, according to the water pump bearing of claim 2, the space between the cylindrical portion of the slinger, since the fitted close contact with the reduced diameter portion formed in the pump shaft, the outer ring and the pump shaft The capacity can be increased, the degree of freedom in designing the seal body can be increased, and the peripheral speed of the inner diameter of the seal member can be reduced to improve the wear resistance of the seal body.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a water pump bearing according to an embodiment of the present invention.

FIG. 2 is a partially cutaway view of the water pump bearing of FIG.

FIG. 3 is a sectional view of a main part showing another embodiment.

FIG. 4 is a sectional view of a main part showing still another embodiment.

FIG. 5 is a sectional view of a main part showing still another embodiment.

FIG. 6 is a sectional view of a main part showing still another embodiment.

FIG. 7 is a Weibull plot of an evaluation test result.

FIG. 8 is a sectional view of a main part of a conventional water pump bearing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Seal body 11 Seal member 11b, 11e, 11f, 11g Radial sealing lip 11c Side sealing lip 12 Slinger 12a Flange part 12b Cylindrical part 13 Side sealing lip 3 Water pump bearing 31 Outer ring 32 Rolling element 4 Pump shaft 4a Reducing part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroyuki Miyazaki 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside the Yosei Seiko Co., Ltd. (72) Kenji Asano 3- 5-8 Minamisenba, Chuo-ku, Osaka-shi Hirose Dodoji, the inventor of Hiroseido Co., Ltd. (72) 3-5-8 Minamisenba, Chuo-ku, Osaka-shi The inside of the Hiroseiko Co., Ltd. (56) References Shokai Sho 60-167194 (JP, U) Shokai Sho57 179 650 (JP, U) Fully open sho 59-168519 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] An outer ring of a bearing is rotatably mounted via a rolling element on a pump shaft provided with an impeller at one end and a pulley at the other end, and the inside of the bearing is mounted on both ends of the outer ring. A water pump bearing provided with a seal body for sealing, wherein a seal body of the seal body, which is arranged near the impeller, is tightly fitted so as to be integrally rotatable with a pump shaft, and a radius of the pump shaft. a flange portion extending outward, off
A short cylindrical portion extending in the same direction as the cylindrical portion from the outer peripheral edge of the flange portion
And a sealing member that seals between the cylindrical portion of the slinger and the outer ring. The inner peripheral portion of the sealing member is in sliding contact with the outer peripheral surface of the cylindrical portion of the slinger, and all the distal ends are in contact therewith. Multiple extending toward the inside of the bearing
A water pump bearing having a radial sealing lip formed thereon, and a side sealing lip for sealing a gap between the sealing member and a flange portion of the slinger. 2. The slinger cylindrical portion is formed on a pump shaft.
The water pump bearing according to claim 1, wherein the water pump bearing is closely fitted to the reduced diameter portion .