JP2003232446A - Packing, and oil seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent leak of base oil or the like of lubricating grease from a gap between a rotary shaft and a housing supporting this in a rotation drive mechanism or the like. <P>SOLUTION: This oil seal 30 is provided with an oil seal main body 31, and a liquid absorbing body 32 concentrically jointed and integrated with it. The oil seal main body 31 is provided with a rubber lip 33, a spring 34, and a reinforcement metal ring 35. On an inner circumferential surface 36 of the reinforcement metal ring 35, the liquid absorbing body 32 in the form of a ring is jointed. By installing the oil seal 30 on an outer circumferential part of the rotary shaft 44 in the rotation drive mechanism 40, base oil or the like separated from the lubricating grease inside can be absorbed and held by the liquid absorbing body 32. Leak of base oil or the like can thus be securely prevented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing and oil used for sealing between a rotary shaft or a reciprocating shaft and a fixed housing to prevent lubricating oil from leaking from the inside and foreign substances from entering from the outside. It is about seals.

[0002]

2. Description of the Related Art In a drive mechanism having a rotary shaft of a rotary drive mechanism and a reciprocating shaft of a linear motion mechanism, grease lubrication is performed to lubricate each sliding portion inside the mechanism. In addition, a sealing mechanism using packing or an oil seal is used so that the lubricating oil does not leak to the outside from a gap in the outer peripheral portion of the rotating shaft or the reciprocating shaft.

[0003]

Here, particularly in the case of grease lubrication, even if packing or an oil seal is attached so that the grease does not leak from the lubricated portion, the base oil of the grease is separated and driven. It may ooze out to the outside or another portion inside the drive mechanism through the joint between the members forming the mechanism or from the gap between the members.

In view of this point, an object of the present invention is to reliably prevent the base oil of grease and the like from leaking out through a seal mechanism using a packing or an oil seal.

[0005]

In order to solve the above problems, the packing of the present invention comprises a rubber packing main body,
It is characterized in that it is composed of a liquid absorber joined to the packing body.

Here, in a typical configuration, the packing body and the liquid absorber have a ring shape and are joined together concentrically.

In this case, the liquid absorber can be joined to the inner peripheral surface of the packing body. Alternatively, the liquid absorber can be joined to the annular side surface of the packing body. Alternatively, the liquid absorber can be bonded to the outer peripheral surface of the packing body.

Next, the liquid absorber may be made of felt or liquid absorbing polymer.

On the other hand, the oil seal of the present invention is characterized by comprising a rubber lip and a liquid absorber joined to the rubber lip.

In this case as well, the rubber lip and the liquid absorber have a ring shape and can be concentrically joined together.

In the case where the reinforcing metal ring is concentrically joined to the rubber lip, the liquid absorber is joined to the outer peripheral surface and / or the inner peripheral surface of the reinforcing metal ring. You can

The liquid absorber may be made of felt or liquid absorbing polymer.

In the packing and the oil seal according to the present invention, since the liquid absorber is integrated, the liquid such as the base oil of the grease which is about to leak out through the packing mounting portion or the oil seal mounting portion is the liquid absorbing body. Absorbed and held by. Therefore, it is possible to surely prevent the base oil or the like from leaking to the outside or an undesired part and causing a failure or the like.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a packing and an oil seal to which the present invention is applied will be described below with reference to the drawings.

(Example of packing) FIGS. 1 (a) and 1 (b)
FIG. 4 is a cross-sectional view showing an example of packing to which the present invention is applied.
The packing 1 shown in FIG. 1A includes a rubber packing main body 2 having a substantially circular cross section, and a liquid absorbent body 3 made of felt or liquid absorbing polymer and concentrically joined to the packing main body 2. . A flat annular end surface 4 is formed on the side surface of the packing body 2, and the liquid absorber 3
Are fixed by, for example, an adhesive.

The liquid absorber 3 is provided with a disk-shaped portion 5 and an annular flange 6 protruding along the outer peripheral edge of the disk-shaped portion 5 in the direction of the central axis 1a. The flat annular end surface 7 of 6 is joined to the annular end surface 4 of the packing body 2. A circular opening 8 is formed in the central portion of the disk-shaped portion 5.

Next, the packing 11 shown in FIG.
It is composed of a ring-shaped rubber packing main body 12 and a ring-shaped felt or liquid absorbing polymer 13 made of a liquid absorbing polymer, which is concentrically joined to the packing main body 12 with an adhesive or the like around the axis 11a. . A flat circular inner peripheral surface 14 is formed on the packing body 12, and a flat circular outer peripheral surface 15 of the liquid absorber 13 is joined to the circular outer peripheral surface 14.

FIG. 1 (c) shows a part of a drive mechanism having a reciprocating shaft or a rotary shaft in which a seal mechanism is constituted by the absorbent body-integrated packings 1 and 11 thus configured. is there. As shown in this figure, the drive mechanism 20
Includes a tubular housing 21, an end plate 22 arranged on the end opening side, and an annular plate 23 arranged between the end surface of the housing 21 and the end plate 22, and penetrates through the central portions thereof. In this state, the reciprocating shaft or rotating shaft 24 is arranged so as to be reciprocally movable in the direction of the central axis 20a.

At the outer peripheral side of the reciprocating shaft or rotating shaft 24, the packing 1 is provided between the housing 21 and the annular plate 23.
Is formed, and the packing 1 is attached thereto. Further, a mounting portion for the packing 11 is formed between the end plate 22 and the annular plate 23, and the packing 11 is mounted here. These two packings 1 and 11 constitute a sealing mechanism that prevents the grease filled in the housing from leaking to the outside.

In the seal mechanism of this example, the packings 1 and 11 constituting the seal mechanism are provided with the liquid absorbers 3 and 13. Therefore, the base oil of grease which is about to leak from the sealing mechanism is absorbed and held by each liquid absorbing plate 2 or 12. As a result, it is possible to reliably prevent the base oil from leaking to the outside. In addition, foreign matter can be reliably prevented from entering from the outside.

(Example of Oil Seal) Next, an example of an oil seal to which the present invention is applied and an example of its use will be described with reference to FIG. As shown in FIG. 2A, the oil seal 30 of the present embodiment is a ring-shaped oil seal main body 31 and a ring-shaped liquid that is concentrically joined to the oil seal main body 31 about a central axis 30a. And an absorber 32.

The oil seal main body 31 is the same as a commonly used one, and in this example, a ring-shaped rubber lip 33 and a ring-shaped spring 34 attached to the rubber lip 33.
And a reinforcing metal ring 35 also attached to the outer peripheral portion of the rubber lip 33. The liquid absorber 32 is made of felt or liquid absorbing polymer, and has a rubber lip 3
3 and is joined to the inner peripheral surface 36 of the reinforcing metal ring 35.

FIG. 2B shows an example of using the oil seal 30. The illustrated example is an example in which the oil seal 30 is used as a seal mechanism of the rotary shaft 41 of the rotary drive mechanism 40. The rotation drive mechanism 40 includes a cylindrical housing 41,
Inside thereof, there is provided a rotating shaft 44 which is rotatably supported via a pair of ball bearings 42 and 43. The tip portion 44a of the rotating shaft 44 is provided in the housing 4
It projects from the open end 41a of No. 1 to the outside. A gap between the housing opening end 41a and the outer peripheral surface of the rotating shaft is sealed by an oil seal 30. Oil seal 3
No. 0 is mounted so that the rubber lip 33 side faces the outside.

In the seal mechanism using the oil seal 30, before the base oil separated from the lubricating grease inside the rotary drive mechanism 40 leaks to the outside through the gap between the housing opening end 41a and the outer peripheral surface of the rotary shaft. , Is absorbed and held by the liquid absorber 32 of the oil seal 30.
Therefore, the base oil does not leak outside.

Next, FIG. 3 (a) shows another example of the oil seal. The oil seal 50 shown in this figure has basically the same configuration as the oil seal 30 described above, but as a liquid absorber, a ring-shaped inner liquid absorber 32A joined to the inner peripheral surface 36 of the reinforcing metal ring 35. And a ring-shaped outer liquid absorber 32B joined to the outer peripheral surface 37 of the reinforcing metal ring 35.

FIG. 3B shows an example in which the oil seal 50 is used to form a seal mechanism for the rotary shaft 44 of the rotary drive mechanism 40. The rotary drive mechanism 60 is the same as that shown in FIG. By using the oil seal 50 of this example, a larger amount of oil can be absorbed and held, so that the base oil of grease can be more reliably prevented from leaking out.

(Other Embodiments) Although the packing has a circular cross section as the packing main body, the present invention can be applied to other cross sectional shapes such as a V-shaped packing. .

Similarly, the above-mentioned oil seal body has a structure with a spring and a metal ring on the outer periphery,
The present invention can be applied to oil seals having other configurations.

Further, the liquid absorbent body of the present invention can be formed of a material having a liquid absorbing property other than the felt and the liquid absorbing polymer.

Further, the shape of the liquid absorber is not limited to the above-mentioned examples, and various other shapes can be adopted, and the shape is concentric with the packing body or the oil seal body. It is also possible to join them in a non-bonded state.

Next, a detailed description of a method of joining the liquid absorber to the packing body and the oil seal body is omitted, but an appropriate joining method may be adopted depending on the materials used.

[0032]

As described above, since the packing of the present invention has the liquid absorbent body joined and integrated with the packing body, the liquid absorbent body can absorb and retain the lubricating oil and the base oil separated from the grease. is there. Therefore, according to the present invention, it is possible to reliably prevent the lubricating oil, the base oil, and the like from leaking out through the packing mounting portion.

Similarly, in the oil seal of the present invention, since the liquid absorber is joined and integrated with the oil seal body,
The liquid absorber can absorb and retain the lubricating oil and the base oil separated from the grease. Therefore, it is possible to reliably prevent the lubricating oil, the base oil, and the like from leaking through the oil seal mounting portion.

[Brief description of drawings]

1A and 1B are cross-sectional views showing examples of packings to which the present invention is applied, and FIG. 1C is an explanatory view showing examples of use of these packings.

FIG. 2A is a sectional view showing an example of an oil seal to which the present invention is applied, and FIG. 2B is an explanatory diagram showing an example of its use.

FIG. 3A is a sectional view showing another example of an oil seal to which the present invention is applied, and FIG. 3B is an explanatory view showing an example of its use.

[Explanation of symbols]

1 packing 2 packing body 3 Liquid absorber 4 Circular end face of packing body 5 Disk-shaped part of liquid absorber 6 Annular flange of liquid absorber 7 Annular end face of annular flange 11 packing 12 Packing body 13 Liquid absorber 14 Circular inner peripheral surface of packing body 15 Circular outer peripheral surface of liquid absorber 20 Drive mechanism 24 reciprocating shaft 30 oil seal 31 Oil seal body 32, 32A, 32B Liquid absorber 33 rubber lips 34 spring 35 metal ring 36 Inner peripheral surface of metal ring 37 Outer peripheral surface of metal ring 40 rotation drive mechanism 44 rotation axis 50 oil seal

[Procedure amendment]

[Submission date] February 20, 2002 (2002.2.2)
0)

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuo Yajima             1856-1 Omaki, Hodaka-cho, Minami-Azumi-gun, Nagano Prefecture             Expression Company Harmonic Drive System             In the Hotaka Factory F-term (reference) 3J006 AE14 AE46                 3J043 AA11 BA08 CA01 CA12 CA15                       CB13 DA07

Claims (10)

[Claims] 1. A packing having a rubber packing main body and a liquid absorber joined to the packing main body. 2. The packing according to claim 1, wherein the packing main body and the liquid absorber have a ring shape and are concentrically joined to each other. 3. The packing according to claim 2, wherein the liquid absorber is bonded to an inner peripheral surface of the packing body. 4. The packing according to claim 2, wherein the liquid absorber is joined to an annular side surface of the packing body. 5. The packing according to claim 2, wherein the liquid absorber is joined to an outer peripheral surface of the packing main body. 6. The packing according to claim 1, wherein the liquid absorbent body is made of felt or liquid absorbent polymer. 7. An oil seal having a rubber lip and a liquid absorber joined to the rubber lip. 8. The oil seal according to claim 7, wherein the rubber lip and the liquid absorber have a ring shape and are concentrically joined to each other. 9. The reinforcement metal ring according to claim 8, wherein a reinforcing metal ring is concentrically joined to the rubber lip, and the liquid absorbent body is joined to an outer peripheral surface and / or an inner peripheral surface of the reinforcing metal ring. Oil seal that is characterized by. 10. The oil seal according to claim 7, wherein the liquid absorber is made of felt or a liquid absorbing polymer.