JPH10169787A - Water pump sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sealing ability and easily do assembling work. SOLUTION: A water pump sealing device has the first seal member 7 made of rubber and integrally molded at one end of a metal core 7a with a lip 7b facing a water pump chamber on the surface of a water pump shaft 1, the second seal member 8 made of polyethrafluoroethylene resin and fitted to the inner diameter of the core 7a of the first seal member 7 with a lip 8a facing the water pump chamber on the surface of the water pump shaft 1, a metal backup ring 9 provided with a cylindrical portion 9a at the outer-diameter end and fitted to the inner diameter of the core 7a of the first seal member 7 with the cylindrical portion 9a facing a bearing 3 to hold the second seal member 8 in a space to the first seal member 7 and a metal ring 10 pressed and fixed into the inner periphery of the cylindrical portion 9a of the backup ring 9. The end of the first seal member 7 is bent to the ring 10 side to form the first seal member, the second seal member, the backup ring and the ring in one unit for mounting and fixing the ring 10 to the inner periphery at the outer ring end of the bearing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing, and more particularly to a rolling bearing applicable to a high temperature state.

[0002]

2. Description of the Related Art Water pumps used in automobiles are:
An impeller mounted on an end of a water pump shaft is rotated in a water pump chamber, and cooling water is circulated in a water jacket of the engine. In such a water pump bearing device, a sealing device is disposed between the bearing portion and the water pump chamber in order to prevent water from entering the bearing section side from the water pump chamber.

[0003] As a conventional water pump sealing device, for example, the one shown in FIG. 3 is known. The sealing device is provided in a housing 32 between a water pump bearing 33 for supporting the water pump shaft 31 and a water pump chamber 34 filled with cooling water. That is, in this sealing device, the water pump bearing 33 is sealed with a bearing seal 36, and a bearing case 37 outside the water pump bearing 33 and a water pump chamber 34 are partitioned by a seal case 38. The case 38 supports a sealing member 39 containing carbon, and the sealing member 3
9 is integrally fixed to the boss of the impeller 35.
A mechanical seal structure is provided which is slidably contacted by an urging force of a spring 41 with the end face of the spring.

[0004]

In the conventional water pump sealing device, troubles such as damage to the water pump bearing due to water leakage from the sliding portion or generation of so-called squeal noise in the sliding portion have been encountered for many years. It is an issue.
As one of the causes of the water leakage, the sealing member 39 of the mechanical seal may contain carbon, and if a hard foreign substance is present in the cooling water, the sliding surface may be damaged. Further, since the sealing device has a complicated structure and a large number of parts, there is a problem that the assembling operation is complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water pump sealing device which prevents generation of squealing noise and water leakage from a sliding portion and which can be easily assembled.

[0006]

As a means for solving the above-mentioned problems, a water pump sealing device for sealing between a sealed bearing and a water pump chamber, which is integrally formed on one end of a metal core. A first sealing member made of rubber and having a lip facing the water pump chamber side on the surface of the water pump shaft, and a lip fitted on the inner diameter side of the core metal of the first sealing member and a lip facing the water pump chamber on the surface of the water pump shaft. A second sealing member made of polytetrafluoroethylene resin facing the first, a cylindrical portion is formed at the outer diameter end, and the cylindrical portion is fitted to the inner diameter side of the core metal of the first sealing member so as to face the bearing side. The first seal member comprises a metal backup ring sandwiching the two seal members between the first seal members, and a metal ring body press-fitted and fixed to the inner peripheral surface of the cylindrical portion of the backup ring. The end is bent toward the ring body to integrate the first seal member, the second seal member, the backup ring, and the ring body, and the ring body is mounted and fixed to the inner peripheral surface of the outer ring end of the bearing. It is characterized by.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of a sealing device for a water pump according to the present invention, and FIG. 2 is a partially enlarged view of the sealing device for a water pump. The water pump shaft 1 is supported by a housing 2 via a water pump bearing 3. At the end of the water pump shaft 1, an impeller 5 that rotates in the water pump chamber 4 is mounted. A sealing device 6 is arranged between the water pump bearing 3 and the water pump chamber 4.

As shown in FIG. 2, the sealing device 6 is made of rubber and is formed integrally with one end of a substantially L-shaped core bar 7a and a lip 7b at the tip is directed toward the water pump chamber 4 on the surface of the water pump shaft 1. And a polytetrafluoroethylene resin (hereinafter referred to as PTFE) which is fitted on the inner diameter side of the metal core 7a of the first seal member 7 and whose lip 8a faces the water pump chamber 4 side on the surface of the water pump shaft 1. A second seal member 8 made of resin) and a cylindrical portion 9a formed at an outer diameter end portion. The cylindrical portion 9a is formed on the inner diameter side of the core metal 7a of the first seal member 7 so that the cylindrical portion faces the water pump bearing 3 side. A metal backup ring 9 that is fitted and clamps the second seal member 8 between the first seal members 7 and extends along the second seal member 8 to back up the second seal member 8.
And a metal ring 10 press-fitted and fixed to the inner peripheral surface of the cylindrical portion 9a of the backup ring 9.

One end of the core bar 7a of the first seal member 7 is embedded in the rubber body, and the other end is bent 7c so that the second seal member 8 and the backup ring 9 are connected to the core bar 7a.
a. The other end of the metal core 7a has a metal ring 10 in the cylindrical portion 9a of the backup ring 9,
After being press-fitted until the axial gap between the first seal member 7, the second seal member 8 and the backup ring 9 disappears, it is bent 7c. Thereby, the first seal member 7, the second seal member 8, the backup ring 9 and the ring 10 are integrated. Further, the ring body 10 and the inner peripheral surface 3b of the end of the outer ring 3a of the bearing 3 are press-fitted and fixed. Further, the ring 10 has a drain hole.

A peripheral groove 12 is formed in the inner peripheral surface of the end of the bearing outer ring 3a near the press-fit portion of the ring body 10, and a bearing seal member 13 for sealing the inside of the bearing is fixed. Inner lip 12a slides on the surface of the water pump shaft 1. Reference numeral 14 denotes a rolling element (a ball in the embodiment) disposed between the outer ring 3a and the shaft 1. Although only half of the bearing is described in the embodiment, a sealed bearing is used as in the conventional structure shown in FIG.

[0011]

According to the water pump sealing device of the present invention, a flexible rubber seal is disposed on the water side, and a PTFE resin seal and a backup ring which receive pressure are disposed therein, thereby improving the sealing performance. I do. In addition, the use of a PTFE resin seal improves lubricity and leads to prevention of squeal. Further, since the unit is previously unitized and attached to the bearing outer ring, the assembling work is facilitated.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a water pump sealing device of the present invention.

FIG. 2 is a partially enlarged view of the water pump sealing device of the present invention.

FIG. 3 is a partial cross-sectional view of a conventional water pump sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pump shaft 2 Housing 3 Water pump bearing 4 Water pump chamber 5 Impeller 6 Sealing device 7 First seal member 8 Second seal member 9 Backup ring 10 Ring

Claims (1)

[Claims] 1. A water pump sealing device for sealing between a hermetically sealed bearing and a water pump chamber, wherein the lip is formed integrally with one end of a metal core and has a lip on the water pump shaft surface on the water pump chamber side. A first seal member made of rubber and a second seal member made of polytetrafluoroethylene resin fitted to the inner diameter side of the core of the first seal member and the lip of which faces toward the water pump chamber on the surface of the water pump shaft. A metal portion which has a cylindrical portion formed at an outer diameter end thereof and which is fitted to the inner diameter side of the core metal of the first seal member so that the cylindrical portion faces the bearing side, and clamps the second seal member between the first seal members. A backup ring and a metal ring which is press-fitted and fixed to the inner peripheral surface of the cylindrical portion of the backup ring, and an end of the first seal member is bent toward the ring side to form a first seal member. Second sea A sealing member for a water pump, wherein the ring member, the backup ring, and the ring are integrated with each other, and the ring is mounted and fixed on the inner peripheral surface of the outer ring end of the bearing.