JPH0658335A - Structure of bearing seal groove - Google Patents

Abstract

PURPOSE:To provide the structure of a bearing seal groove which can improve mounting property of seal member without changing the existing axial aperture of a bearing section. CONSTITUTION:In the case of an article in which seal member 14 is mounted into an annular packing groove 12 provided in the axial aperture 11 of a bearing sectin 10, and a rod member 20 is fitted into the axial aperture 11 through the seal member 14 freely rotatably or freely slidably, the seal member 14 can be mounted without difficulty, as an annular auxiliary insert groove 13 is provided in the axial aperture 11 with a step subsequently to the packing groove 12, and the seal member 14 is put in the packing groove 12 at the second stage, after it has been dropped into the auxiliary insert groove 13 at the first stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal groove structure in a bearing portion of a rod member that rotates or slides.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of a seal groove structure of a rod member in a bearing portion. That is, an annular packing groove 3 is provided in the shaft hole 2 of the bearing portion 1, and a sealing member 4, which is usually called a U-shaped packing, is attached to the packing groove 3. The seal member 4 is mounted in the packing groove 3 so as to be substantially flush with the hole surface of the shaft hole 2, and a rod member (not shown) is brought into sliding contact with the seal member 4 in a water-tight or oil-tight manner,
It is a structure that rotates or slides. The outer diameter D of the seal member 4 is formed to be larger than the hole diameter d of the shaft hole 2, and the seal member 4 can be attached to the packing groove 3 from one side 2a or the other side 2b of the shaft hole 2 while elastically deforming the seal member 4. The seal member 4 that has been pushed in and reached the packing groove 3 is elastically restored to the shaft hole 2
It is accommodated so that it is substantially flush with the hole surface of or, or slightly protrudes from the packing groove 3. In the case of such a bearing seal groove structure, when the seal member 4 is mounted in the packing groove 3,
Since a method of pushing the seal member 4 at once using the elastic deformation of the seal member 4 is adopted, if the pushing is impossible, the seal member 4 after being housed in the packing groove 3 may be locally deformed or damaged. There is. In order to eliminate such a problem, a bearing seal groove structure as shown in FIG. 5 may be used. That is, the hole diameter d ₁ on one side 2a of the shaft hole 2 is machined to be larger than the hole diameter d ₂ on the other side 2b,
The seal member 4 is inserted from the larger one side 2a in the direction of arrow A, aiming at facilitating the insertion of the seal member 4 into the shaft hole 2 and enhancing the mountability in the packing groove 3. Is. However, in the case of the conventional structure of FIG. 5, a bearing (not shown) is provided on one side 2a of the shaft hole 2.
When the mounting of the bearing is scheduled, the hole diameter d ₁ is large, so that there is a disadvantage that the size of the selected bearing must be changed.

[0003]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a bearing seal groove structure in which the mountability of the seal member is improved without changing the current shaft hole diameter of the bearing portion.

[0004]

In a bearing seal groove structure according to the present invention, a seal member is attached to an annular packing groove provided in a shaft hole of a bearing portion, and a rod member is inserted into the shaft hole through the seal member. In a rotatably or slidably fit type, an annular insertion auxiliary groove is provided following the packing groove with a step in the shaft hole, and the seal member is dropped into the insertion auxiliary groove in the first step and then in the second step. It is configured to fit in the packing groove.

[0005]

Since the seal member is dropped into the insertion assisting groove in the first stage and then accommodated in the packing groove in the second stage, it is easy to mount the seal member.

[0006]

Embodiments of the bearing seal groove structure according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a shaft hole 11 is provided in the bearing portion 10, and a rod member 20 is fitted in the shaft hole 11 so as to be rotatable or slidable. Shaft hole 1
1 is provided with an annular packing groove 12, and the packing groove 1
2 is the same U as that shown in FIGS. 4 and 5 of the conventional example.
A seal member 14 called a mold packing is attached. The rod member 20 is inserted into the seal member 14, and has a structure that ensures water tightness or oil tightness during rotation or sliding through the seal member 14.

Here, in the shaft hole 11, an insertion auxiliary groove 13 is also provided annularly following the packing groove 12. With respect to the hole diameter d _{1 of the} shaft hole 11, the groove outer diameter d ₂ of the packing groove 12
Is largely d ₁ <d ₂ , and the groove outer diameter d ₃ of the insertion assisting groove 13 is
Is smaller than the outer diameter d ₂ of the packing groove 12 and is stepped with d ₃ <d ₂ .

Therefore, with such a structure of the bearing portion 10, the seal member 14 is assembled in the packing groove 12 in the following manner. That is, as shown in FIG. 2, the seal member 1 starts from the one side 11A having the insertion assisting groove 13 of the shaft hole 11.
When inserting 4, the seal member 14 is alternately pushed from one side by the push rod 21 using an appropriate jig such as the push rod 21. One side of the seal member 14 fits comfortably and easily into the packing groove 12. The other side of the seal member 14 engages with the insertion assist groove 13 in the first stage. At this time, the seal member 1 retained in the insertion assisting groove 13 by the push rod 21
By lightly pressing one side of No. 4 in the second step, the entire sealing member 14 is easily set in the packing groove 12.

On the other hand, as shown in FIG. 3, when the seal member 14 is inserted from the other side 11B of the shaft hole 11 having the packing groove 12, the push rod 21 alternately pushes the seal member 14 from one side. One side of the seal member 14 is once displaced and engaged with the side of the insertion assist groove 13 in the first stage. When the other side of the seal member 14 is pushed up by the push rod 21 in this state, the one side of the seal member 14 is set in the packing groove 12. From this, as a second step, the entire seal member 14 can be easily made by lightly pushing one side of the seal member 14 retained in the insertion auxiliary groove 13 with the push rod 21 from the one side 11A of the shaft hole 11 this time. It fits in the packing groove 12.

As is apparent from this embodiment, the shaft hole 11
As a result, when selecting the bearing 22 (FIG. 1), there is no unavoidable change in size. FIG. 1 shows an example in which a dust seal 23 is attached to the shaft hole 11 as an example of the bearing seal groove structure.

[0011]

As described above, in the bearing seal groove structure according to the present invention, the sealing auxiliary member is dropped into the insertion auxiliary groove at the first stage by providing the packing auxiliary groove and the insertion auxiliary groove by step processing. In the second step, the seal member is fitted in the packing groove, so that the seal member can be easily attached without difficulty and the deformation and damage of the seal member can be prevented.

[Brief description of drawings]

FIG. 1 is an assembled sectional view of a bearing seal groove structure according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an example of an assembly procedure of the embodiment.

FIG. 3 is a sectional view showing another example of the assembling procedure of the embodiment.

FIG. 4 is an assembled sectional view of a conventional bearing seal groove structure.

FIG. 5 is an assembled sectional view of another bearing seal groove structure of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bearing part 11 Shaft hole 11A One side of shaft hole 11B The other side of shaft hole 12 Packing groove 13 Insertion auxiliary groove 14 Seal member 20 Rod member 21 Push rod 22 Bearing

[Procedure amendment]

[Submission date] October 30, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of a seal groove structure of a rod member in a bearing portion. That is, an annular packing groove 3 is provided in the shaft hole 2 of the bearing portion 1, and a sealing member 4, which is usually called a U-shaped packing, is attached to the packing groove 3. The seal member 4 is mounted in the packing groove 3 so as to be substantially flush with the hole surface of the shaft hole 2, and a rod member (not shown) is brought into sliding contact with the seal member 4 in a water-tight or oil-tight manner,
It is a structure that rotates or slides. The outer diameter D of the seal member 4 is formed to be larger than the hole diameter d of the shaft hole 2, and the seal member 4 can be attached to the packing groove 3 from one side 2a or the other side 2b of the shaft hole 2 while elastically deforming the seal member 4. The seal member 4 that has been pushed in and reached the packing groove 3 is elastically restored to the shaft hole 2
It is accommodated so that it is substantially flush with the hole surface of or, or slightly protrudes from the packing groove 3. In the case of such a bearing seal groove structure, when the seal member 4 is mounted in the packing groove 3,
Since a method of pushing the seal member 4 at once using the elastic deformation of the seal member 4 is adopted, if the pushing is impossible, the seal member 4 after being housed in the packing groove 3 may be locally deformed or damaged. There is. In order to eliminate such a problem, a bearing seal groove structure as shown in FIG. 5 may be used. That is, the step is processed to be larger than the hole diameter d ₁ on the one side 2a of the shaft hole 2 and the hole diameter d ₂ on the other side 2b,
The seal member 4 is inserted from the one side 2a of the larger shaft hole 2 in the direction of the arrow A, so that the seal member 4 can be easily inserted into the shaft hole 2 and the mountability in the packing groove 3 can be improved. Is aimed at. However, in the case of the conventional structure of FIG. 5, when a bearing (not shown) is planned to be mounted on the one side 2a of the shaft hole 2, the hole diameter d ₁ is large, so that There is the inconvenience of having to change the size.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

On the other hand, as shown in FIG. 3, when the seal member 14 is inserted from the other side 11 B having the packing groove 12 of the shaft hole 11, the seal member 14 is alternately pushed by the push rod 21 from one side. One side of the seal member 14 is once displaced and engaged with the side of the insertion assist groove 13 in the first stage. When the other side of the seal member 14 is pushed up by the push rod 21 in such a state, one side of the seal member 14 is packed in the packing groove 12
Fits in. As the second stage, this time one side 1 of the shaft hole 11
By lightly pushing one side of the seal member 14 retained in the insertion assisting groove 13 with the push rod 21 from 1A, the entire seal member 14 is easily set in the packing groove 12.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

In the bearing seal groove structure according to the present invention , the insertion assisting groove is formed by step-processing following the packing groove, so that the seal member is dropped into the insertion assisting groove in the first stage
Since it is housed in the packing groove in the second stage, the seal member can be easily and easily attached, and deformation and damage of the seal member can be prevented.

Claims (1)

[Claims] 1. A bearing seal groove structure in which a seal member is mounted in an annular packing groove provided in a shaft hole of a bearing portion, and a rod member is rotatably or slidably fitted in the shaft hole via the seal member. In the above-mentioned bearing, the annular insertion auxiliary groove is provided with a step in the shaft hole following the packing groove, and the seal member is dropped into the insertion auxiliary groove in the first stage and then accommodated in the packing groove in the second stage. Seal groove structure.