JP2913070B2 - Mounting method of sealing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of mounting a sealing device used for a water pump bearing of an automobile engine, for example.

<Prior Art> As shown in FIG. 3, a water pump bearing for an automobile engine includes a shaft 21, an outer ring 22, and rolling elements 23 and 24 provided in a double row between the two. Sealing devices 25,... Are provided outside of 23, 24, respectively.

The sealing device 25 mounted on the water pump bearing may fall off due to severe vibration or large internal pressure,
For this reason, it is necessary to make the attachment strength to the outer ring 22 a certain strength or more.

What has been devised from the necessity as described above is the sealing device shown in FIGS. 4 (A) and 4 (B).

In this sealing device, the core is composed of a single sealing member 26 in which an elastic body is baked. A step 26a is formed at an intermediate diameter position between the inside and outside of the seal member 26, and a portion 26b having an outside diameter from the step 26a is inclined toward the inside of the bearing before being attached to the bearing.

In mounting, first, the seal member 26 is inserted between the shaft 21 and the outer ring 22, and the tip of the outer diameter portion 26b is inserted into the fitting groove of the outer ring 22.

Next, the sealing member 26 is pushed in by a pushing jig 27. The jig 27 has an outer diameter portion of the sealing member 26.
A pressing portion 27a for pressing the 26b and a reference surface 27b for regulating the pressing position are formed. Then, the pressing portion 27a of the jig 27 is applied to the reference of the outer diameter portion 26b of the seal member 26, and in this state, the jig 27 is pushed in until the reference surface 27b contacts the end surface of the outer ring 22. By this pushing, the outer diameter portion 26b of the seal member 26 rises along the radial direction, and its tip bites into the fitting groove. Thus, the seal member 26 is fixed to the outer race 22 with a large mounting strength.

<Problems to be Solved by the Invention> On the other hand, in addition to the above-described sealing device, as a sealing device attached to another bearing, a sealing member 28 and a slinger 29 as shown in FIG. There are those that are composed of

Such a sealing device with a slinger has the advantage that the number of lips of the sealing member 28 can be increased to enhance the sealing effect.

If such a slinged seal is used for a water pump bearing, the seal should be more reliable. In that case, if the conventional structure was used for the water pump bearing,
In order to ensure the strength of attachment of the seal member to the outer ring at a certain level or more, a large space is required in dimensions, which greatly imposes restrictions on bearing design. Therefore, a seal member having high mounting strength in a small space is required. For this purpose, it is desirable that the seal member be of a type in which an outer diameter portion is deformed and fitted to an outer ring.

As described above, as a sealing device suitable for a water pump bearing, a sealing device with a slinger and a sealing member of a type in which an outer diameter portion is deformed and fitted to an outer ring can be considered. Such sealing devices are laborious to install.

This is because, at the time of attachment, it is necessary to first attach a seal member using a pushing jig as shown in FIG. 4 (B), and then attach a slinger to the inner peripheral side of the seal member. The mounting process involves two steps, which is troublesome.

The present invention has been made in view of the above-described problems, and allows a sealing device with a slinger to be attached to a bearing by a single pushing operation, thereby simplifying an attachment process and using a sealing device. It is an object to secure a seal.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides an outer ring with a slinger and a seal member deforming an outer diameter portion of the seal member so as to stand up in the radial direction. A method for attaching a sealing device to be fitted to a bearing, comprising: providing a pushing jig having a pressing portion for pressing an outer diameter portion of a sealing member and a concave portion in which a slinger can be fitted; By fitting the slinger into the recess of the above, the assembly consisting of the slinger and the seal member is held by a jig, and the assembly of the seal member and the slinger is pushed into the inside of the outer ring by the jig, so that the seal member The outer diameter portion is deformed into an upright shape along the radial direction to fit the outer ring, and a slinger is mounted on the inner peripheral side.

<Operation> In the above method, in a state where the seal member and the slinger are combined with each other, the jig is attached to the inner peripheral side of the outer ring by a single pushing operation.

In the mounted state, the outer diameter portion of the seal member stands up and its tip bites into the fitting groove of the outer ring, so that the mounting strength is large. Further, by providing a large number of lips in contact with the slinger on the sealing member, the sealing performance is improved.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a sectional view of a sealing device and a jig used for carrying out the method of the present invention.

The sealing device includes a sealing member 1 and a slinger 2.

The seal member 1 is obtained by baking an elastic body 1B such as rubber on a cored bar 1A, and has a step 1c at an intermediate diameter position between the inner and outer sides. 1d is formed. The outer diameter portion 1d is inclined toward the inside of the bearing from a position slightly closer to the outer periphery than the step portion 1c in a state before mounting on the bearing, and at the time of mounting, as described later, along the radial direction. By standing upright, its tip bites into the fitting groove of the bearing outer ring. The elastic member 1B on the inner diameter side of the seal member 1 has two radial lips 1
e, 1f and one side lip 1g are formed. Each of the radial lips 1e, 1f extends inward in the axial direction.

The slinger 2 includes a cylindrical portion 2a and an annular plate 2b. Tube
2a is fitted on the outer periphery of the shaft, and two radial lips 1e and 1f of the seal member 1 are in sliding contact with the outer periphery. The annular plate 2b rises in the radial direction from the outer end of the cylindrical portion 2a,
Side lip 1g slides on the inner surface. At the outer diameter end of the annular plate 2b, there is an inward folded portion 2c.

Reference numeral 3 denotes a pressing jig of the sealing device. The jig 3 has a pressing portion 3a, a reference surface 3b, and a concave portion 3c. The pressing portion 3a is for pressing the outer diameter portion 1d of the seal member 1 to be deformed to an upright state, and protrudes in the axial direction at a radial position corresponding to the outer diameter portion 1d. The reference surface 3b is for restricting the pushing position of the sealing device, and comes into contact with the end surface of the outer race. The recess 3c is for fitting the slinger 2 therein, and has an inner diameter on the inner peripheral side of the pressing portion 3a, into which the slinger 2 fits in the axial direction.

Next, FIG. 2 (A) shows a method of mounting the sealing device having the above configuration.
Description will be made based on (B).

First, each lip 1e, 1f, 1g of the sealing member 1 is
Sealing member 1 and slinger 2 so as to contact corresponding portions of
And the slinger 2 is fitted in the concave portion 3c of the jig 3 in the combined state. Slinger 2 is concave
Since the seal member 1 is held in the outer periphery of the cylindrical portion 2 a of the slinger 2, the assembly of the seal member 1 and the slinger 2 is eventually held by the jig 3.

And, by the jig 3 holding the assembly in this way,
As shown in FIG. 2A, the sealing member 1 and the slinger 2
Are set at fixed positions between the shaft 4 and the outer ring 5. In this state, the outer diameter portion 1d of the seal member 1 is still inclined toward the inside of the bearing.

With the assembly thus set, the jig 3 is pushed inward in the axial direction. Due to this pushing, the pressing portion 3a presses the base of the outer diameter portion 1d, so that the outer diameter portion 1d rises along the radial direction as shown in FIG. Cut into the fitting groove. Thus, the seal member 1 is fixed to the outer race 5 with a large mounting strength.

When the outer diameter portion 1d rises, the reference surface 3a of the jig 3
Abuts against the end face of the outer race 5, so that further pushing is prevented.

Simultaneously with the pressing of the outer diameter portion 1d, the slinger 2 is moved to the concave portion 3c.
As a result, it is pushed on the shaft 4 and is mounted at an axial position corresponding to the seal member 1.

In this manner, the sealing member 1 and the slinger 2 are attached to the fixed positions by a single pressing operation of the jig 3.
Thereafter, the jig 3 may be retracted.

In the mounted state, the outer diameter portion 1d of the seal member 1 stands up and its tip bites into the fitting groove of the outer ring 5, so that the mounting strength is extremely large. Further, since the two radial lips 1e and 1f of the seal member 1 and the one side lip 1g are in contact with the slinger 2, the number of sealing locations is increased and the sealing performance is improved.

<Effects of the Invention> As described above, according to the present invention, a sealing device including a sealing member and a slinger can be mounted on a bearing by a single pushing operation of a jig, and the mounting process is simplified. .

Further, in the mounted state, the outer diameter of the seal member rises and its tip bites into the fitting groove of the outer ring, so that the mounting strength is extremely large and does not fall off even when subjected to severe vibration or large internal pressure.

Further, the seal member can be provided with a number of lips that come into contact with the slinger, and these lips can enhance the sealing performance.

[Brief description of the drawings]

1 and 2 relate to one embodiment of the present invention, and FIG. 1 is a cross-sectional view of a sealing device and a jig used for carrying out the present invention.
2 (A) and 2 (B) are cross-sectional views showing the mounted state. 3 to 5 relate to a conventional example, FIG. 3 is a half sectional view of a water pump bearing, FIGS. 4 (A) and 4 (B) are sectional views showing a mounting state of a sealing device, and FIG. It is sectional drawing of the sealing device of FIG. DESCRIPTION OF SYMBOLS 1 ... Seal member, 1d ... Outer diameter part for deformation, 2 ... Slinger, 3 ... Jig, 3a ... Pressing part, 3b ... Reference surface, 3c ...
Recess, 4 ... shaft, 5 ... outer ring.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16J 15/32 311

Claims (1)

(57) [Claims] 1. A method of attaching a sealing device fitted to an outer ring to a bearing with a slinger and deforming an outer diameter portion of the sealing member so as to rise in a radial direction, the sealing member comprising: A pressing jig having a pressing portion for pressing the outer diameter portion of the above and a concave portion in which the slinger can be fitted is prepared, and the slinger is fitted in the concave portion of the jig, so that the slinger and the sealing member are provided. The assembly consisting of and is held by a jig, and the assembly of the seal member and the slinger is pushed into the inside of the outer ring by the jig to deform the outer diameter portion of the seal member into an upright shape in the radial direction. A method of mounting a sealing device, comprising fitting an outer ring and mounting a slinger on an inner peripheral side thereof.