JP2010112398A - Sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure reducing accuracy required in the centering of a shaft and a shaft hole to enhance assemblability. <P>SOLUTION: A sealing structure is equipped with: a shaft 1; a housing 2 which includes a shaft hole 20 into which the shaft 1 is inserted; and a seal member 3 which is mounted in a mounting groove 10 provided in an outer peripheral surface of a shaft 1, has a radial dimension larger than a diameter of the shaft hole 20 while being mounted in the mounting groove 10, and seals the annular gap between the shaft 1 and shaft hole 20, and the sealing structure is assembled by inserting the shaft 1 into the shaft hole 20 with the seal member 3 mounted in the mounting groove 10. The timing at which the seal member 3 is accommodated in the shaft hole 20 when the shaft 1 is inserted into the shaft hole 20, is made different from one part to another in a circumferential direction of the seal member 3. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a sealing structure in which an annular gap between a shaft and a housing having a shaft hole into which the shaft is inserted is sealed with a seal member.

  Conventionally, various types of sealing structures of this type are known (see Patent Documents 1 to 5). Here, with reference to FIG. 3, the sealing structure which concerns on a prior art example is demonstrated. FIG. 3 is a schematic cross-sectional view showing a configuration of a sealing structure according to a conventional example.

  As shown in FIG. 3, the sealing structure according to the related art seals the shaft 100, the housing 200 having the shaft hole 201 into which the shaft 100 is inserted, and the annular gap between the shaft 100 and the shaft hole 201. And a seal member 300.

  The seal member 300 is an annular member made of a rubber-like elastic body such as a so-called O-ring, and is attached to an annular attachment groove 101 provided on the outer peripheral surface of the shaft 100. The seal member 300 has an outer diameter φC set larger than the diameter φD of the shaft hole 201, and is compressed in the radial direction between the groove bottom surface of the mounting groove 101 and the inner peripheral surface of the shaft hole 201 at the time of mounting. It becomes a state. Therefore, the seal member 300 is in close contact with the groove bottom surface of the mounting groove 101 and the inner peripheral surface of the shaft hole 201, thereby sealing the annular gap between the shaft 100 and the shaft hole 201 of the housing 200.

  In the sealing structure configured as described above, before the shaft 100 is inserted into the shaft hole 201, the seal member 300 is mounted in the mounting groove 101 of the shaft 100 in advance, and the shaft 100 to which the seal member 300 is mounted is pivoted. It is assembled by inserting into the hole 201.

  As described above, since the outer diameter of the seal member 300 is set larger than the diameter of the shaft hole 201, the seal member 300 is inserted into the inner periphery of the shaft hole 201 when the shaft 100 is inserted into the shaft hole 201. The shaft 100 must be inserted while sliding on the surface. Moreover, since the mounting groove 101 is provided along the circumferential direction of the shaft 100 (direction perpendicular to the axis), the timing at which the seal member 300 contacts the shaft hole 201 or the opening edge of the shaft hole 201 is It will be the same over the entire circumference. Therefore, if the center of the shaft 100 is precisely aligned with the center of the shaft hole 201 and is not inserted straight, a part of the seal member 300 may be bitten.

However, the operation of inserting the shaft 100 straight while maintaining the state in which the centers are accurately aligned may require a certain level of arm force to support the shaft 100 depending on the size of the apparatus. Therefore, the work may be difficult for a female worker with poor arm strength, for example. In addition, when it is necessary to support with both hands, work efficiency is deteriorated.
Japanese Utility Model Publication No. 62-106089 Japanese Patent Laid-Open No. 08-061507 JP 2003-194228 A JP 2004-218672 A JP 2004-218787 A

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a sealing structure with improved assemblability.

In order to achieve the above object, the sealing structure in the present invention comprises:
The axis,
A housing having a shaft hole into which the shaft is inserted;
The shaft is mounted in a mounting groove provided on the outer peripheral surface of the shaft, and has a radial dimension larger than the diameter of the shaft hole in a state of being mounted in the mounting groove, and between the shaft and the shaft hole. A sealing member for sealing the annular gap;
With
In the sealing structure assembled by inserting the shaft into the shaft hole in a state where the seal member is mounted in the mounting groove,
The timing when the seal member is accommodated in the shaft hole when the shaft is inserted into the shaft hole is configured to be different for each portion in the circumferential direction of the seal member.

  As described above, according to the present invention, the timing at which the seal member is accommodated in the shaft hole, that is, the timing at which the seal member contacts the inner peripheral surface of the shaft hole or the opening edge of the shaft hole is different for each portion in the circumferential direction of the seal member. It is configured. Therefore, in inserting the shaft, it is only necessary to pay attention to whether or not the portion of the seal member that sequentially comes into contact with the inner peripheral surface of the shaft hole or the edge of the shaft hole is not bitten. As a result, even if the center of the shaft and the center of the shaft hole do not exactly match (even if they are slightly deviated), the shaft can be inserted into the shaft hole without causing the seal member to bite. Accordingly, the accuracy required for centering the shaft and the shaft hole is reduced, and even an inferior arm force, for example, a female worker, can be easily inserted. Further, since the insertion work with one hand is possible, the work efficiency can be improved.

  The mounting groove is formed along an annular intersection line formed by the intersection of the outer peripheral surface of the shaft and a virtual plane extending in a direction inclined with respect to the axial direction and the direction orthogonal to the axial direction. It is good that it is an annular groove.

  By installing the seal member in such a mounting groove, the timing at which the seal member fits in the shaft hole when the shaft is inserted into the shaft hole is configured to be different for each portion in the circumferential direction of the seal member. Can do.

The mounting groove is a wavy annular groove extending in the circumferential direction while meandering on the outer peripheral surface of the shaft,
The seal member may be an annular seal member curved in a shape corresponding to the shape of the mounting groove.

  By configuring the mounting groove and the seal member in this manner, the timing at which the seal member is accommodated in the shaft hole when the shaft is inserted into the shaft hole is configured to be different for each portion in the circumferential direction of the seal member. Can do.

  The width in the axial direction of the tapered surface formed at the opening edge of the shaft hole may be larger than the width in the axial direction of the region where the mounting groove is formed in the shaft.

  Thereby, the generation | occurrence | production of the biting by having shifted the timing accommodated in a shaft hole for every part of a seal member can be suppressed effectively.

  As described above, the assemblability is improved by the present invention.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

Example 1
With reference to FIG. 1, the sealing structure which concerns on Example 1 of this invention is demonstrated. FIG. 1 is a schematic diagram illustrating the configuration of the sealing structure according to the first embodiment of the present invention. FIG. 1 shows a state before the shaft is inserted into the shaft hole.

  The sealing structure according to this embodiment includes a shaft 1, a housing 2 having a shaft hole 20 into which the shaft 1 is inserted, and a seal member 3 that seals an annular gap between the shaft 1 and the shaft hole 20. I have.

  The seal member 3 is an annular member made of a rubber-like elastic body such as a so-called O-ring, and is attached to an annular attachment groove 10 provided on the outer peripheral surface of the shaft 1. The seal member 3 is set such that the radial dimension in the state in which it is mounted in the mounting groove 10 is set to be larger than the diameter of the shaft hole 20, and the groove bottom surface of the mounting groove 10 and the shaft in the state where the sealing structure is assembled. It will be in the state compressed radially between the inner peripheral surfaces of the hole 20. Accordingly, the seal member 3 is in close contact with the bottom surface of the mounting groove 10 and the inner peripheral surface of the shaft hole 20, and seals the annular gap between the shaft 10 and the shaft hole 20 of the housing 2.

  In the sealing structure configured as described above, before the shaft 1 is inserted into the shaft hole 20, the seal member 3 is mounted in the mounting groove 10 of the shaft 1 in advance, and the shaft 1 to which the seal member 3 is attached is connected to the shaft hole. It is assembled by inserting into 20. In the figure, the seal member 3 is mounted in the mounting groove 10 of the shaft 1 and the state before the shaft 1 is inserted into the shaft hole 20 is shown. The shaft 1 is inserted into the shaft hole 20 downward (in the direction indicated by the arrow in the drawing).

  A tapered surface 21 is formed at the opening edge of the shaft hole 20 in order to improve the insertability of the shaft 1 and suppress the biting of the seal member 3 when the shaft 1 is inserted. The seal member 3 mounted in the mounting groove 10 of the shaft 1 is in a state where the outer peripheral side partially protrudes outward (in the outer diameter direction) from the outer peripheral surface of the shaft 1, and as described above, The dimension in the radial direction when mounted in the mounting groove 10 is set to be larger than the diameter of the shaft hole 20. Therefore, when the shaft 1 is inserted into the shaft hole 20, a part (a part or all of the outer peripheral side) of the seal member 3 contacts and slides on the inner peripheral surface or the tapered surface 21 of the shaft hole 20. .

  In the sealing structure according to the present embodiment, the mounting groove 10 is provided to be inclined rather than perpendicular to the axial direction as in the conventional annular groove. That is, the mounting groove 10 of the present embodiment is not formed along the intersecting line formed by intersecting the outer peripheral surface of the shaft 1 and the virtual plane perpendicular to the axial direction as in the prior art. 1 is formed in an annular shape along an annular intersection line formed by the intersection of an outer peripheral surface and an imaginary plane extending in a direction inclined with respect to each of the axial direction and the direction orthogonal to the axial direction. In other words, the mounting groove 10 is located on one virtual plane in which the point closest to the tip end of the shaft 1 and the point farthest from the tip end of the shaft 1 in the mounting groove 10 includes the axis of the shaft 1, and the virtual plane When the mounting groove 10 is projected onto the virtual plane from the normal line direction, a line connecting the point closest to the tip end of the shaft 1 and the point farthest from the tip end of the shaft 1 in the mounting groove 10 is the axis line in the virtual plane. It is formed on the outer peripheral surface of the shaft 1 so as to extend in a direction inclined with respect to the orthogonal direction. Therefore, the mounting groove 10 is configured such that the position in the axial direction is different for each portion in the circumferential direction.

  When the shaft 1 is inserted into the shaft hole 20, the seal member 3 is fitted in the mounting groove 10 configured as described above (the inner peripheral surface or taper of the shaft hole 20). The timing (which comes in contact with and slides on the surface 21) is different for each portion in the circumferential direction.

  When the shaft 1 is inserted into the shaft hole 20, the seal member 3 first has a portion close to the distal end side of the shaft 1 in the seal member 3, that is, a portion indicated by reference numeral 31 in the drawing and a region near the shaft hole. 20 is brought into contact with and sliding on the inner peripheral surface 20 or the tapered surface 21. Next, in the figure, a portion indicated by reference numeral 32 and a region in the vicinity thereof (including a region opposite to the opposing direction passing through the axis center), that is, a region adjacent to the portion indicated by reference numeral 31 and the region in the vicinity thereof are axial holes. 20 is brought into contact with and sliding on the inner peripheral surface 20 or the tapered surface 21. Finally, the portion farthest from the tip end side of the shaft 1, that is, the portion indicated by reference numeral 33 in the drawing and the region in the vicinity thereof are brought into contact / sliding with the inner peripheral surface or the tapered surface 21 of the shaft hole 20.

  Here, the inclination with respect to the circumferential direction of the mounting groove 10 is set so that the width A in the axial direction of the region where the mounting groove 10 is formed in the shaft 1 is smaller than the width B in the axial direction of the tapered surface 21. Yes. As a result, when the seal member 3 comes into contact with the inner peripheral surface of the shaft hole 20 or the tapered surface 21 when the shaft is inserted, that is, a portion of the seal member 3 that first contacts the shaft hole 20 or the tapered surface 21 ( When the portion 31 and the vicinity thereof are in contact with the inner peripheral surface of the shaft hole 20 or the tapered surface 21, the entire seal member 3 is the end surface around the shaft hole opening edge of the housing 2 (end surface adjacent to the tapered surface 21). ) In the shaft hole 20 inside (in a region facing the tapered surface 21).

  According to this embodiment, the timing at which the seal member 3 is accommodated in the shaft hole 20, that is, the timing at which the seal member 3 contacts the inner peripheral surface or the tapered surface 21 of the shaft hole 20 is a portion in the circumferential direction of the seal member 3. Each is configured to be different. Therefore, in the insertion operation of the shaft 1, it is only necessary to pay attention to whether or not the portion of the seal member 3 that sequentially comes into contact with the inner peripheral surface of the shaft hole 20 or the tapered surface 21 does not bite. In the present embodiment, the insertion work may be performed while paying attention to whether or not biting occurs in the order of the vicinity of the reference numeral 31, the vicinity of the reference numeral 32, and the vicinity of the reference numeral 33 of the seal member 3.

  Thereby, even if the center of the shaft 1 and the center of the shaft hole 20 are not exactly aligned (even if they are slightly deviated), the shaft 1 is inserted into the shaft hole 20 without causing the seal member 3 to be engaged. Is possible. Therefore, the accuracy required for centering of the shaft 1 and the shaft hole 20 is reduced, and even an inferior arm force, for example, a female worker or the like, can be easily inserted. Further, since the insertion work with one hand is possible, the work efficiency can be improved. That is, the assembling property of the sealing structure can be improved.

  Further, according to the present embodiment, the portion (reference numeral 31 and the vicinity thereof) that first contacts the inner peripheral surface or tapered surface 21 of the shaft hole 20 in the seal member 3 is the inner peripheral surface or tapered surface 21 of the shaft hole 20. When contacted, the entire seal member 3 is configured to be located closer to the shaft hole 20 side than the end surface around the shaft hole opening of the housing 2 (end surface adjacent to the tapered surface 21). As a result, a portion (reference numeral 32, reference numeral 33 and the vicinity thereof) of the seal member 3 that will later come into contact with the inner peripheral surface or the tapered surface 21 of the shaft hole 20 is formed on the end surface around the shaft hole opening of the housing 2. It is suppressed more reliably that the shaft 1 and the housing 2 are caught by being caught. In other words, it is possible to effectively suppress the occurrence of biting caused by shifting the timing of being accommodated in the shaft hole for each portion of the seal member 3.

(Example 2)
With reference to FIG. 2, the sealing structure which concerns on Example 2 of this invention is demonstrated. FIG. 2 is a schematic diagram illustrating the configuration of the sealing structure according to the second embodiment of the present invention. FIG. 2 shows a state before the shaft is inserted into the shaft hole. Here, the same components as those in the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and only different portions from the first embodiment are described.

  In the present embodiment, the configuration of the mounting groove and the seal member is different from that of the first embodiment. In this embodiment, the mounting groove 10a is a corrugated annular groove extending in the circumferential direction while meandering on the outer peripheral surface of the shaft 1. Further, in this embodiment, the seal member 3a is an annular seal member curved in a corrugated shape corresponding to the shape of the mounting groove 10a.

  With such a configuration of the mounting groove 10a and the seal member 3a, the timing at which the seal member 3a is accommodated in the shaft hole 30 when the shaft 1 is inserted into the shaft hole 20 is different for each portion in the circumferential direction of the seal member 3a. It is configured as follows. That is, the seal member 3a comes into contact with and slides on the inner circumferential surface of the shaft hole 20 or the tapered surface 31 in the order of the reference numeral 31a and the vicinity thereof, the reference numeral 32a and the vicinity thereof, the reference numeral 33a and the vicinity thereof.

  In the present embodiment, the first portion accommodated in the shaft hole 20 (reference numeral 31a and the vicinity thereof) and the last portion accommodated in the shaft hole 20 (reference numeral 33a and the vicinity thereof) are 90 °. Each of the shapes is alternately formed. Thereby, the part which contacts the inner peripheral surface or the taper surface 21 of the shaft hole 20 at the same timing is configured to be formed in pairs at positions facing each other through the shaft center, and the seal member 3a at the time of shaft insertion is formed. The mounting posture is stabilized, and the biting suppression effect can be further improved.

  That is, at the time of inserting the shaft, if the seal member 3a is compressed to the inner peripheral surface of the shaft hole 20 from only one point, a portion (a surplus portion) that does not fit in the mounting groove 10a is formed in the seal member 3a. There is a concern that However, in this embodiment, since the seal member 3a is always compressed from both sides at the respective positions facing each other through the shaft center, the occurrence of the remainder of the seal member 3a is suppressed, and the biting is less likely to occur. be able to.

  The corrugated shape of the mounting groove is not limited to the configuration of the present embodiment, and may be wavy (meandering) more finely than the present embodiment, or may be wavy more than the present embodiment. It may be.

  However, if the wavy shape becomes too fine, there will be a number of portions that fit within the shaft hole 20 at the same timing, and the allowable range of the center deviation between the shaft and the shaft hole becomes narrow. End up. As a result, high accuracy is required for the centering of the shaft and the shaft hole. Therefore, it can be said that it is preferable to configure appropriately in view of the assembling property.

FIG. 1 is a schematic view of a sealing structure according to Embodiment 1 of the present invention. FIG. 2 is a schematic view of a sealing structure according to Embodiment 2 of the present invention. FIG. 3 is a schematic cross-sectional view of a sealing structure according to a conventional example.

Explanation of symbols

1 shaft 10 mounting groove 2 housing 20 shaft hole 21 taper surface 3 seal member

Claims (4)

The axis,
A housing having a shaft hole into which the shaft is inserted;
The shaft is mounted in a mounting groove provided on the outer peripheral surface of the shaft, and has a radial dimension larger than the diameter of the shaft hole in a state of being mounted in the mounting groove, and between the shaft and the shaft hole. A sealing member for sealing the annular gap;
With
In the sealing structure assembled by inserting the shaft into the shaft hole in a state where the seal member is mounted in the mounting groove,
The sealing structure is characterized in that when the shaft is inserted into the shaft hole, a timing at which the seal member is accommodated in the shaft hole is different for each portion in the circumferential direction of the seal member.   The mounting groove is formed along an annular intersection line formed by the intersection of the outer peripheral surface of the shaft and a virtual plane extending in a direction inclined with respect to the axial direction and the direction orthogonal to the axial direction. The sealing structure according to claim 1, wherein the sealing structure is an annular groove. The mounting groove is a wavy annular groove extending in the circumferential direction while meandering on the outer peripheral surface of the shaft,
The sealing structure according to claim 1, wherein the seal member is an annular seal member curved in a shape corresponding to the shape of the mounting groove.   The width in the axial direction of the tapered surface formed at the opening edge of the shaft hole is larger than the width in the axial direction of the region where the mounting groove is formed in the shaft. The sealing structure according to crab.

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