JPS6343026A - Sealing device for water pump - Google Patents

Abstract

PURPOSE:To improve the fitting accuracy into a cylinder chamber by holding the outer ring of a bearing at one end section and providing a main body supporting a fixed ring, sealing belows, a holding case of a rotary ring, and a spring. CONSTITUTION:A stepped shaft 11 is assembled in a cylinder chamber 121, and a drain hole 20 is provided on an outer ring 141. Bellows 18 are brought into close contact with an inner wall 121a, the peripheral stepped section 25 of a main body 17 is coupled with the outer ring 141, and a bearing seal 144 is held by an end face 172a. Accordingly, the inside of the main body 17 and the drain hole 20 are communicated, and the main body 17 and a bearing 14 are integrated. When a metal ring 151 and a resin ring 152 of a holding case 15 are fixed to the stepped shaft 11, a rotary ring 153 and a fixed ring 21 are pressed by the force of a spring 22; the holding case 15, main body 17, bellows 18, and fixed ring 21 are integrated, thus no sealing drift occurs between the rotary ring 153 and fixed ring 21 at the time of assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a water pump sealing device for sealing a water pump bearing.

BACKGROUND OF THE INVENTION Conventionally, a water pump used in an automobile or the like has a shaft 3 supported within a housing 1 by a bearing 5, as shown in FIG. An impeller 10 is attached to one end of the shaft 3, and a sealing device 30 is provided on the shaft 3 between the impeller IO and the bearing 5. As shown in FIG. 5, in this sealing device 30, a ring-shaped mandrel 6 having a U-shaped cross section is inserted into a shaft 3 in a cylinder chamber 2 of a housing l, and an outer peripheral portion 6a of this mandrel 6 is inserted into a cylinder. The mandrel 6 is attached by being pressed against the inner wall 2a of the chamber 2. Further, between the mandrel 6 and the bearing 5, there is provided a ring-shaped partition wall member 7 made of resin and having a plurality of notches 9°9, . . . on the circumference of the outer periphery. This partition member 7 has its outer periphery fitted into the inner wall 2a of the cylinder chamber 2, and is mounted between the bearing 5 and the mandrel 6 with its both sides abutting the bearing 5 and the mandrel 6, respectively. . Further, a mechanical seal 4 is provided on the shaft 3 on the opposite side of the partition member 7 with the mandrel 6 interposed therebetween. On the other hand, a drain hole 8 is provided in the cylinder chamber 2 corresponding to the location where the partition wall member 7 exists.

Water leaking from the mechanical seal 4 and entering the partition wall member 7 is discharged to the outside through the drain holes 8 from the notches 9° 9, . . . in the partition wall member 7.

<Problems to be Solved by the Invention> However, since the conventional sealing device 30 described above is constructed by combining the mandrel 6, the partition wall member 7, etc., the number of parts is large, the installation work is complicated, and the cost is high. There is a problem with rising prices. In addition, in the conventional sealing device described above, the installation accuracy of the mechanical seal 4 is the sum of the accuracy of the partition wall member 7 and the core metal 6, which are separate members, so the installation accuracy inevitably deteriorates and there is a risk of water leakage. There is. Further, since the structure of the mandrel 6 is complicated, there is a problem in that it is difficult to process and costs are high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sealing device for a water pump that allows a mechanical seal to be mounted with high precision, has a small number of parts, is easy to assemble, and is inexpensive.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the water pump sealing device of the first invention has a water pump sealing device that faces a water drain hole at one end that abuts the outer ring of the bearing that is fitted into the cylinder chamber of the housing. a cylindrical body whose outer diameter portion communicates with the inside through a passage, and which supports a fixing ring at the other end; a bellows that seals between the inner wall of the cylinder chamber and the main body by contacting the inner wall of the cylinder chamber; and a holding case that is fixed to the inner ring of the bearing and supports the rotating ring in opposition to the fixed ring. and a spring provided between the main body and the fixed ring to press the fixed ring against the rotating ring via the bellows.

Further, the water pump sealing device of the second invention has one end surface abutting the outer ring fitted into the cylinder chamber of the housing, and holds a bearing seal protruding inward at one end,
Further, an outer diameter portion facing the drain hole at one end communicates with the inside through a passage, while a cylindrical body supporting a fixing ring at the other end, and surfaces of the body and the fixing ring facing each other. a bellows that covers and seals between the main body and the fixing ring, and further contacts an inner wall of the cylinder chamber to seal between the inner wall and the main body; A holding case is provided between the main body and the fixing ring, and a holding case that holds the rotating ring facing the rotating ring and has an extending portion that extends along the inner ring and has an outer circumferential surface in sliding contact with the bearing seal. I was told,
The apparatus is characterized by comprising a spring that presses the fixed ring against the rotating ring via the bellows.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In FIG. 1, 11 is a stepped shaft of the water pump that also serves as an inner ring, 12 is a housing having a cylinder chamber 121,
14 is an outer ring 141, 142° 142, ..., a retainer 143, and a bearing seal [44] is a bearing section; 15 is a holding case that holds a ceramic rotating ring 153;
Reference numeral 17 indicates a cylindrical main body made of hot water-resistant polyamide resin that holds a fixing ring 21 made of carbon at its end face, and reference numeral 18 indicates a bellows made of rubber.

The main body 17 includes a cylinder chamber 12 as shown in FIG.
It is formed of one end 172 of a cylindrical shape having a diameter smaller than the inner diameter of 1, and the other end 171 of a cylindrical shape continuous with this one end 172 and having a diameter slightly larger than this one end 172. The one end portion 172 has six cutout holes 24° 24, . . . formed at equal intervals along the circumferential direction. This notch hole 24.24. . . communicates with a water drain hole 20 of the housing 12, which will be described later. A circumferential portion 25 having a rectangular cross section and fitting into the end portion 141 a of the outer ring 141 is formed at the outer circumferential end of the one end portion 172 . On the other hand, the other end portion 171 has an end groove 3I formed therein. A tapered portion 171a is formed at the outer peripheral end of this end groove 31. Other end 1
At the inner circumferential end of 71, two bundle parts 32, 32 are provided in the circumferential direction.

As shown in Figure 1, the bellows 18 is formed into a ring shape, and has an annular groove 181 formed on the outer circumferential side of one end thereof, and bends the inner circumferential side of the other end radially outward to form a bent portion. 1
82 is formed.

The fixing ring 21 has an annular protrusion 2II formed on its front surface, and an annular groove 2 II on its rear surface corresponding to the annular protrusion 211.
12, and four portions 213, 213 are formed on the inner diameter portion, into which the protrusions 32, 32 of the other end portion 171 of the main body 17 are fitted.

Then, the protrusions 32 32 of the other end 171 of the main body 17 are fitted into the recesses 213 , 213 of the fixing ring 21 to support the fixing ring 21 and to prevent the fixing ring 21 from rotating. Also, between the main body 17 and the fixing ring 21, a tapered portion 171 at the outer peripheral end of the other end 171 of the main body 17 is provided.
The outer wall of the annular groove 181 of the bellows 18 is tightly fitted into the annular groove 212 of the fixing ring 21.
The bent portion 182 of the main body 17 is fitted into the other end portion 1 of the main body 17.
The intermediate portion between the outer peripheral end and the inner peripheral end of the bellows 18 is brought into close contact with the end face groove 31 of the bellows 18 to seal the mutually opposing surfaces of the main body 17 and the fixing ring 21.
The three members, the "l" and the bellows 18, are firmly adhered to seal them, and the spring 22 is compressed between the main body 17 and the fixing ring 21 via the bellows 18 at both ends.In this way, Since the main body 17, the fixing ring 21, and the bellows 18 are manufactured by firmly bonding them together, manufacturing is simple.
Further, since the structure does not use a mandrel which is complicated in structure and expensive to manufacture as in the conventional example, it is possible to reduce the number of parts at low cost.

On the other hand, the holding case 15 includes a metal ring 15 having a U-shaped cross section and an end groove, and a resin ring 152 having a U-shaped cross section and a long cylindrical portion 152a that is in close contact with the end groove of the metal ring 151. A rotary ring +53 is integrally fixed and held in the end groove of the metal ring 151 of the holding case 15 via a resin ring 152.Resin ring 152 At the end of the cylindrical portion 152a, there is a bent portion 15 bent radially outward.
2b is formed.

A stepped shaft 11 is supported by a bearing 14 within the cylinder chamber 121 of the housing 12 . Cylinder chamber 12
1, a drain hole 20 is provided near one end 141a of the outer ring 141 of the bearing 14.

Then, the outer peripheral surface 181a of the bellows 18 is connected to the cylinder chamber 1.
21 and one end 1 of the main body 17.
72 is fitted into one end 141a of the outer ring 141, and the bearing seal 144 is fitted on the end surface 172a of the one end 172.
hold. In this way, the notch holes 24, 24, .
4° 24, . . . and the space between the inner wall 121a of the cylinder chamber 121 and one end portion 172 of the main body 17, a passage is formed in which the inside of the main body 17 and the drain hole 20 communicate with each other. Further, the main body 17 and the bearing 14 are integrated.

In this way, the cylinder chamber 1 is constructed by integrating the main body 17, the bellows 18, and the fixing ring 21 without using a metal core as in the conventional example.
21, the installation work is easy. on the other hand,
The holding case 15 includes the cylindrical portion 1 of the metal kema ring 151.
51a and the cylindrical portion 152a of the resin ring 152 are fitted into the outer peripheral surface 112 of the stepped shaft 11, and the bent portion 152b of the cylindrical portion 152a of the resin ring 152 is inserted into the stepped portion I of the stepped shaft 11.
ll and is fixed to the stepped shaft 11. In this way, the contact surface 153a of the rotating ring 153 and the fixed ring 21
The contact surfaces 211a of the annular protrusion 211 face each other and abut against each other, and are pressed by the force of the spring 22. In this way, holding case 1
5 and main body 17. Since the bellows 18 and the fixed ring 21 are integrated, there will be no seal deviation between the rotating ring +53 and the fixed ring 21 during assembly. Accuracy during assembly can be improved.

Further, the seal between the main body 17 and the cylinder chamber 121 is achieved by the sealing by the outer peripheral surface 181a of the bellows 18, and the seal between the rotating ring 153 and the fixed ring 21 is achieved by pressing the fixed ring 21 against the rotating ring 153 by the spring 22. Since the main body 17 is made of a metal material, the workability during assembly can be improved, and the space A between the main body 17 and the bearing 14 can be almost completely sealed from the outside of the main body 7. In addition, one end 172 of the main body 17 has a notch hole 24, 24°.
. . , even if water enters the space A from the outside, it is discharged to the outside from the drain hole 20 of the housing 12 through the notch holes 24, 24° . . . of the main body 17. Therefore, water does not accumulate in the space A, and rusting and damage of the bearing 14 due to water can be prevented.

In the bearing sealing device shown in FIG. 3, a main body 17 holds a bearing seal 144 that protrudes inward, and a cylindrical portion 251a, that is, an extension portion of a resin ring 251 extends along the axial direction, and the bearing seal 144 The main body 17 is in sliding contact with the lip portion 144a.
, the bearing seal 144 and the cylindrical portion 25 of the resin ring 251
1a to the space, and the external water drain hole 20 is inserted through the notch holes 24, 24... of the one end portion 172 of the main body 17.
We have secured a passageway that connects to the Note that the bearing seal 144 may be a rotating seal type that is not held by the main body [7].

<Effects of the Invention> As is clear from the above description, the water pump sealing device of the first invention includes a main body that abuts the outer ring of the bearing at one end and supports a fixing ring at the other end; A bellows that seals between the main body and the fixed ring and between the inner wall of the cylinder chamber and the main body, a holding case that holds the rotating ring facing the fixed ring, and a spring that presses the fixed ring against the rotating ring. Because it is equipped with this, it can be easily and accurately installed into the cylinder chamber, and since it does not use a core metal like in conventional models, the number of parts can be reduced, costs can be reduced, and the structure can be simplified. can.

According to the water pump sealing device of the second invention, in addition to the effects of the first invention, the extending portion of the holding case extends to the sealing member of the bearing and is sealed with the sealing member. Therefore, a passage through which water entering from the outside can be discharged can be secured by the main body, the holding case, and the bearing seal. Therefore, water that has entered between the main body and the bearing can be easily drained to the outside.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view of the partition member of the above embodiment, Fig. 3 is a sectional view showing an embodiment of a different invention, and Figs. 4.5 are conventional It is a sectional view showing an example. 11... Inner ring, 12... Housing, 121...
Cylinder chamber, 14... Bearing, 15... Holding case,
17...Body.

Claims (2)

[Claims] (1) A cylindrical body whose outer diameter portion facing the drain hole at one end that abuts the outer ring of the bearing fitted into the cylinder chamber of the housing communicates with the inside through a passage, while supporting a fixing ring at the other end. and a bellows that covers opposing surfaces of the main body and the fixing ring to seal between the main body and the fixing ring, and further contacts an inner wall of the cylinder chamber to seal between the inner wall and the main body. a holding case that is fixed to the inner ring of the bearing and supports the rotating ring in opposition to the fixed ring; and a holding case that is provided between the main body and the fixed ring and that supports the fixed ring through the bellows. A water pump sealing device characterized by comprising a spring that presses against a rotating ring. (2) One end surface is in contact with the outer ring fitted into the cylinder chamber of the housing, and one end holds a bearing seal that protrudes inward, and furthermore, the outer diameter portion facing the drain hole at the one end is inside by a passage. a cylindrical body that communicates with the cylinder while supporting a fixing ring at the other end; a cylindrical body that covers opposing surfaces of the body and the fixing ring to seal between the body and the fixing ring; a bellows that contacts an inner wall of the chamber and seals between the inner wall and the main body; and a bellows fixed to the inner ring of the bearing;
a holding case that holds the rotary ring opposite to the fixed ring and has an extension part that extends along the inner ring and has an outer circumferential surface in sliding contact with the bearing seal; A sealing device for a water pump, comprising: a spring provided between the fixed ring and the rotating ring through the bellows.