JP2016080125A - Seal device of rolling bearing for water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal device of a rolling bearing for a water pump by which excellent durability can be obtained.SOLUTION: A second slinger 20 is composed of a cylinder part 21 which is externally fit to a rotating shaft 6, and a circular ring part 22 which is bent to the outside of a diameter direction from an axial one-end edge of the cylinder part 21, and one portion of the circular ring part 22 is cut and raised to form a plurality of vanes 22a. Then, the vanes 22a are made to oppose internal peripheral face side opening end parts of an intake hole and an exhaust hole which are formed in a housing. By the rotation of the vanes 22a, an airflow is generated, and water and foreign matters in the vicinity are blown out to the outside of a diameter direction, and sent to the intake hole or the exhaust hole being a communication hole.SELECTED DRAWING: Figure 1

Description

  The present invention is used to prevent the cooling water from entering a rolling bearing for supporting a rotating shaft of a water pump for circulating cooling water of an automobile engine on a housing.

  A water pump for circulating cooling water of an automobile engine is configured as shown in FIG. 3, for example. The housing 1 is formed by combining the outer half 2 and the inner half 3 in the middle, and connecting the two halves 2 and 3 with bolts 4 and 4. The inner half 3 is communicated with a water jacket of an engine (not shown) through a pipe (not shown). On the other hand, a cylindrical portion 5 is provided in the outer half portion 2, and a rotating shaft 6 is rotatably supported by a rolling bearing unit 7 inside the cylindrical portion 5. An impeller 8 is provided at the inner end (the inner end of the housing 1 and the right end in FIG. 3) of the rotating shaft 6, and a pulley is provided at the outer end (the outer end of the housing 1 and the left end in FIG. 3). 9 are fixed. During the operation of the engine, the pulley 9 is rotationally driven via the belt 10 by the crankshaft of the engine. As a result, the impeller 8 rotates in the housing 1 to circulate the cooling water in the water jacket.

The rolling bearing unit 7 is a rolling element between an outer ring raceway provided on the inner peripheral surface of the outer ring 11 fitted and fixed to the cylindrical portion 5 and an inner ring raceway provided on the outer peripheral surface of the rotary shaft 6. A plurality of rollers 12 and balls 13 are provided so as to roll freely. Such a rolling bearing unit 7 supports a large radial load applied to the rotary shaft 6 from the belt 10 via the pulley 9 and prevents the rotary shaft 6 from being displaced in the thrust direction. 1, the rotary shaft 6 is rotatably supported. Further, seal rings 14 and 14 are provided at both ends in the axial direction (left and right direction in FIG. 2) of such a rolling bearing unit 7 to prevent leakage of grease sealed inside, dust, water vapor, etc. existing outside. To prevent leakage.
Each of these seal rings 14, 14 is composed of a ring-shaped cored bar 15 and an elastic material 16 as detailed in FIG. 4. The elastic material 16 is attached to the core metal 15 so as to protrude inward in the diameter direction from the inner peripheral edge of the core metal 15, and has a plurality of seal lips 17 and 17. The inner peripheral edges of the seal lips 17 and 17 are brought into sliding contact with the outer peripheral surface of the intermediate portion of the rotating shaft 6 to seal the inside and outside of the rolling bearing unit 7.

In the case of the water pump as described above, a mechanism for preventing leakage of hot water mixed with water vapor present in the water jacket to the outside regardless of the rotation of the rotary shaft 6 inside the housing 1 is necessary. become. If the leakage amount of hot water becomes excessive, the cooling water must be replenished frequently, which is not only troublesome, but also the hot water containing water vapor enters the rolling bearing unit 7 side. This is because the durability of the rolling bearing unit 7 is adversely affected. Therefore, conventionally, a mechanical seal 18 is provided between the outer peripheral surface of the rotating shaft 6 and the inner peripheral surface of the housing 1 to prevent the hot water mixed with the water vapor from leaking to the outside. The mechanical seal 18 prevents the hot water containing water vapor flowing in the water jacket from leaking outside while allowing the rotation of the rotary shaft 6 during operation of the engine.

In a part of the housing 1 and between the mechanical seal 18 and the rolling bearing unit 7, an intake hole 23 and an exhaust hole 24, each of which is a communication hole, are provided separately in the vertical direction. The intake holes 23 and the exhaust holes 24 are provided in order to prevent hot water or water vapor leaked through the mechanical seal 18 from reaching the rolling bearing unit 7. That is, during operation of the engine, the pressure in the water jacket rises to about 0.7 to 0.9 kg / cm @ 2 (gauge pressure), for example. Accordingly, the hot water containing water vapor flowing through the water jacket passes through the mechanical seal 18 and enters the housing 1 albeit little by little. However, the water vapor or hot water entering the housing 1 in this way is discharged out of the housing 1 through the exhaust hole 24. The intake hole 23 sucks outside air into the housing 1 so that water vapor and hot water are smoothly discharged from the exhaust hole 24.

The pressure at a portion of the housing 1 facing the seal ring 14 provided at the end opening portion of the rolling bearing unit 7 does not become particularly high. For this reason, even in the case of the conventional structure shown in FIGS. On the other hand, as a structure for more reliably preventing the cooling water from entering the rolling bearing unit 7, Japanese Utility Model Laid-Open No. 3-77093 discloses a sealing device as shown in FIG. .

  First, in the case of the second example of the conventional structure shown in FIG. 5, the metal plate is bent into a U-shaped cross section at the middle portion of the rotating shaft 6 slightly on the impeller side portion from the seal ring 14a. A slinger 19 is formed and fixed by external fitting. The elastic material 16 of the seal ring 14a is provided with a total of three seal lips 17 and 17a, two on the inner peripheral edge and one on the side surface on the impeller side. Of these three seal lips 17 and 17a, one (left side in FIG. 5) of the seal lip 17 formed on the inner peripheral edge is formed on the outer peripheral surface of the rotary shaft 6 and the other ( The seal lip 17 of the right side of FIG. 5 is provided on the outer peripheral surface of the inner cylindrical portion of the slinger 19 and the seal lip 17a formed on the side surface is provided on the outer peripheral surface of the outer cylindrical portion of the slinger 19 over the entire circumference. It is in sliding contact.

  In the case of the second example of this conventional structure, a larger labyrinth action can be obtained at the seal portion than in the case of the first example shown in FIGS. For this reason, the amount of cooling water entering the rolling bearing unit 7 can be reduced, and the durability of the rolling bearing unit 7 can be improved.

Japanese Utility Model Publication No. 3-77093

  In recent years, the life of vehicles has been extended due to the permeation of resource-saving thinking, etc., and water pump rolling bearings are also required to have a longer life. Therefore, it is possible to obtain the durability superior to the case of the second example of the conventional structure shown in FIG. 5 as well as the first example of the conventional structure shown in FIGS. Realization of is desired. The present invention has been made in view of such circumstances.

The above-described problems of the present invention are achieved by the following configuration.
A rotating shaft for fixing the impeller constituting the water pump at one end, an outer ring fitted and fixed to the housing of the water pump in a state of being arranged around the intermediate portion of the rotating shaft, and provided on the inner peripheral surface of the outer ring A plurality of rolling elements provided between the outer ring raceway and the inner ring raceway provided on the outer peripheral surface of the rotating shaft, a ring-shaped cored bar, and a state protruding inward in the diameter direction from the inner peripheral edge of the cored bar It consists of an elastic material attached to a cored bar and having a plurality of seal lips, and by opening the outer peripheral edge of the cored bar to the inner peripheral edge of the opening of the outer ring on the impeller side, the opening end of the outer ring A seal ring fixed to the shaft, and an outer edge of at least one seal lip among the plurality of seal lips constituting the seal ring by being fitted and fixed to the impeller side of the seal ring at an intermediate portion of the rotation shaft The whole circumference Over and a slinger sliding contact, in the sealing device of the rolling bearing water pump with a, providing a plurality of blades on the slinger and integrally or separately.

  An air flow is generated by the rotation of the plurality of wings of the second slinger. For this reason, water and foreign matter in the vicinity of the seal lip are reduced, and the water / dust resistance of the water pump rolling bearing can be improved.

Sectional drawing of the sealing apparatus of the rolling bearing for water pumps which shows the 1st example of embodiment of this invention. Sectional drawing of the sealing apparatus of the rolling bearing for water pumps which shows the 2nd example of embodiment of this invention. Sectional drawing of the water pump which integrated the rolling bearing and the sealing device which shows the 1st example of a conventional structure. The partial expanded sectional view which shows the 1st example of the conventional sealing device. The partial expanded sectional view which shows the 2nd example.

  Hereinafter, embodiments of a seal device for a rolling bearing for a water pump according to the present invention will be described in detail with reference to the drawings. The feature of the present invention is that the slinger is devised, and the structure and operation of the other parts are the same as those of the conventional structure shown in FIGS. In addition, the same reference numerals are used and overlapping descriptions are omitted, and the configuration and operation of the slinger, which is a characteristic part of the present invention, will be described in detail below.

A first embodiment according to the present invention will be described with reference to FIG.
A metal plate is bent into an L-shaped cross section at the intermediate portion of the rotary shaft 6 between the slinger 19 as the first slinger and the mechanical seal 18 (see FIG. 3) to form an annular shape as a whole. A second slinger 20 is fixed by external fitting. That is, the second slinger 20 includes a cylindrical portion 21 that is externally fitted and fixed to the rotating shaft 6, and an annular portion 22 that is bent radially outward from one axial end edge of the cylindrical portion 21. A part of the annular portion 22 is cut and raised to form a plurality of wings 22a. And this wing | blade 22a is made to oppose the inner peripheral surface side opening edge part of the suction hole 23 and the exhaust hole 24 (refer FIG. 3) formed in the housing 1. As shown in FIG. As the wings 22a rotate, an air flow is generated, and water and foreign matter in the vicinity are blown away outward in the diametrical direction, and each is sent to the intake hole 23 or the exhaust hole 24, which are communication holes. The second slinger 20 (and also the first slinger 19) is preferably made of a stainless steel plate in order to prevent corrosion due to leaked cooling water.

  In the case of the water pump rolling bearing seal device of the present invention configured as described above, the second slinger 20 that rotates together with the rotary shaft 6 has a lot of cooling water leaked from the mechanical seal 18. This portion is fed into the intake hole 23 or the exhaust hole 24 (particularly, the exhaust hole 24), and is discharged out of the housing 1 through the intake hole 23 or the exhaust hole 24. Accordingly, the absolute amount of cooling water and foreign matter that reaches the rolling bearing unit 7 side beyond the annular portion 22 constituting the second slinger 20 is reduced. For this reason, the amount of cooling water and foreign matter entering the rolling bearing unit 7 through the seal portion formed by the slinger 19 and the seal ring 14a provided at the opening end of the rolling bearing unit 7 is extremely small. Less (close to zero). As a result, the durability of the rolling bearing unit 7 based on the entrance of cooling water or foreign matter can be prevented from being lowered, and the durability of the water jacket incorporating the rolling bearing unit 7 can be dramatically improved. .

A second embodiment according to the present invention will be described with reference to FIG.
In the case of this example, a plurality of resinous wings 22b are integrally molded with the slinger 19, and the action,
The effect is the same as in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Housing 2 Outer half part 3 Inner half part 4 Bolt 5 Cylindrical part 6 Rotating shaft 7 Rolling bearing unit 8 Impeller 9 Pulley 10 Belt 11 Outer ring 12 Roller 13 Ball 14, 14a Seal ring 15 Core metal 16 Elastic material 17, 17a Seal lip 18 Mechanical seal 19 (First) slinger 20 Second slinger 21 Cylindrical portion 22 Circular portions 22a, 22b Wings 23 Intake hole 24 Exhaust hole

Claims (1)

  A rotating shaft for fixing the impeller constituting the water pump at one end, an outer ring fitted and fixed to the housing of the water pump in a state of being arranged around the intermediate portion of the rotating shaft, and provided on the inner peripheral surface of the outer ring A plurality of rolling elements provided between the outer ring raceway and the inner ring raceway provided on the outer peripheral surface of the rotating shaft, a ring-shaped cored bar, and a state protruding inward in the diameter direction from the inner peripheral edge of the cored bar It consists of an elastic material attached to a cored bar and having a plurality of seal lips, and by opening the outer peripheral edge of the cored bar to the inner peripheral edge of the opening of the outer ring on the impeller side, the opening end of the outer ring And at least one seal lip of the plurality of seal lips constituting the seal ring by being externally fitted and fixed to the impeller side slightly at a middle portion of the rotary shaft. Tip edge In a water pump rolling bearing seal device comprising a slinger that is slidably contacted over the entire circumference of the water pump, wherein a plurality of wings are provided integrally or separately from the slinger Rolling bearing seal device.

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