JP3475611B2 - Sealing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used, for example, in a shaft sealing portion of various devices, and more particularly to a structure in which a sealing member is slidably attached to an outer peripheral surface of a shaft via a tubular body.

[0002]

[Prior art]

(First Conventional Example) As a conventional sealing device of this type, there is, for example, a device shown in FIG. 5 which is used for a shaft sealing portion of an engine mechanism. That is, in this sealing device 100, a seal member 101 made of a rubber-like elastic body (hereinafter referred to as rubber) is slidably attached to an outer peripheral surface of a shaft 103 via a metal outer case case 102 as a cylindrical body. It is a thing.

At one opening end of the outer can case 102,
The seal member 101 has a radially inwardly facing flange portion 104, and a recess 105 is provided on the outer periphery of the seal member 101. By fitting the flange portion 104 of the outer can case 102 into the recess 105, the seal member is formed. 101 is an outer case 102
It is attached to the non-bonded state. That is, the flange portion 104 of the outer can case 102 serves as a mounting portion for the seal member 101.

Then, the seal member 101 attached to the outer can case 102 is assembled to the shaft 103 as follows.

The shaft 103 is reciprocally inserted in a tubular guide member 106, and the guide member 106 is reciprocally movable.
Is a mating attachment member having an insertion hole 111 into which the shaft 103 is reciprocally inserted, such as the engine head 10.
Positioning is achieved by contacting the end surface of 7.

The outer diameter of the guide member 106 and the inner diameter of the outer can case 102 are substantially the same.

The outer case case 102, to which the seal member 101 is attached, is metal-fitted to the outer periphery of the guide member 106, and the lower end thereof is brought into contact with the end surface of the engine head 107 to be positioned. Further, there is a notch in the circumferential direction in the axially intermediate part of the outer can case 102, and the outer can case 102 is assembled by crimping the notch 110 to the outer peripheral surface of the guide member 106.

At this time, the seal lip 108 on the inner circumference of the seal member 101 slidably sealingly contacts the outer circumferential surface of the shaft 103, and the lower lip 109 in the drawing is the guide member 106.
It makes a sealed contact with the end face of.

(Second Conventional Example) FIG. 6 shows a sealing device according to a second conventional example. This sealing device 200
In the same manner as the first conventional example, the outer can case 202 to which the seal member 201 is attached is metal-fitted to the outer periphery of the guide member 206.

The rubber seal member 201 is attached to the inner end surface of a radially inwardly facing flange portion 204 provided at one open end portion of the outer can case 202 and further to the inner peripheral surface thereof. ing.

Then, the seal member 201 attached to the outer can case 202 is assembled to the shaft 203 as follows.

The shaft 203 is reciprocally inserted into a tubular guide member 206, and the guide member 206 is reciprocally movable.
Is a cylindrical engine head 2 to be inserted together with the shaft 203.
It is inserted and fixed in 07 and positioned.

The outer diameter of the guide member 206 and the inner diameter of the outer can case 202 are substantially the same, and a recess 205 is provided at an axially intermediate portion of the guide member 206.

The outer case case 202, to which the seal member 201 is attached, is metal-fitted to the outer periphery of the guide member 206, and the lower end thereof is brought into contact with the end surface of the engine head 207 for positioning. And the outer can case 202
The guide member 206 is assembled by caulking with the caulking portion 210 at a position corresponding to the recess 205.

At this time, the seal lip 208 on the inner periphery of the seal member 201 is slidably sealedly contacted with the outer peripheral surface of the shaft 203, and the lower lip 209 in the figure is hermetically contacted with the end surface of the guide member 206. .

(Third Conventional Example) FIG. 7 shows a sealing device according to a third conventional example. This sealing device 300
Unlike the first and second conventional examples, the rubber seal member 301 is fitted to the outer periphery of the guide member 306 with the outer can case 302, which is a so-called rubber fitting type.

The outer can case 302 is a stepped tubular body having a first flange portion 304 and a second flange portion 305 that are radially outward in the lower side of the drawing.

Further, the seal member 301 is also a tubular body, and has a seal lip 308 having a wedge-shaped cross section that projects inward in the radial direction at one opening end and an outside in the radial direction at the other opening end. It has an oriented flange portion 310.

The outer can case 302 is fitted around the outer periphery of the seal member 301, and the inner end surface of the first flange portion 304 is attached by contacting the flange portion 310 of the seal member 301. That is, the cylindrical portion 311 and the first flange portion 304 of the outer can case 302 are mounting portions for the seal member 301.

Then, the seal member 301 attached to the outer can case 302 is assembled to the shaft 303 as follows.

The shaft 303 is reciprocally inserted in a cylindrical guide member 306, and the guide member 306 is reciprocally movable.
Is stepped, and the large diameter portion 312 is inserted and fixed together with the shaft 303 into the hole 313 of the engine head 307 such that the end surface of the engine head 307 and the step surface 315 are substantially flush with each other.

The seal member 301 is the guide member 3
The outer can case 302 is rubber-fitted to the outer periphery of the outer case 06, and the inner end surface of the second flange portion 305 of the outer can case 302 comes into contact with the end surface of the engine head 307 to be positioned and the assembly is completed.

At this time, the flange portion 310 of the seal member 301 has the first flange portion 304 of the outer can case 302, the step surface 315 of the guide member 306, and the engine head 3.
The lip 309, which is attached to the end surface of the guide member 307 and is axially provided on the inner circumference of the seal member 301, sealingly contacts the outer peripheral surface of the small diameter portion 314 of the guide member 306. The seal lip 308 of the seal member 301 is the shaft 303.
Is in slidable sealing contact with the outer peripheral surface of the.

Further, the first flange portion 304 and the second flange portion 305 of the outer can case 302 are formed by the spring 31.
The seats 6 and 317 are in contact with each other.

(Fourth Conventional Example) FIG. 8 shows a sealing device according to a fourth conventional example. This sealing device 400
Is a rubber seal member 401 as in the third conventional example.
Is fitted to the outer circumference of the guide member 406 with the outer can case 402 by rubber.

The outer can case 402 is a tubular body having a radially outward flange portion 404 on the lower side in the drawing.
An annular concave portion 4 opening inward in the radial direction at an axially intermediate portion of 5
07 are formed.

Further, the seal member 401 is also a tubular body, and has a seal lip 408 having a wedge-shaped cross section that protrudes inward in the radial direction at one of the opening ends, and the other opening end faces outward in the radial direction. The first flange portion 410 is included. Further, a second flange portion 411 extending radially outward from the first flange portion 410 is provided at a root portion of the seal lip 408 at a predetermined axial distance from the first flange portion 410.

The outer can case 402 is fitted around the outer periphery of the seal member 401. At this time, the first flange portion 410 of the seal member 401 is aligned with the annular recess 40 of the outer can case 402.
7 and the end surface of the second flange portion 411 abuts on the end surface of the tubular portion 405 of the outer can case 402 to be positioned and attached. That is, the tubular portion 405 of the outer can case 402 and the annular recess 407 serve as a mounting portion for the seal member 401.

The seal member 401 attached to the outer can case 402 is assembled to the shaft 403 as follows.

The shaft 403 is reciprocally inserted in a tubular guide member 406 having a step 413.

The seal member 401 is the guide member 4
The outer can case 402 is rubber-fitted to the outer circumference of the cylindrical portion 412 of the outer can case 06, and the flange portion 404 of the outer can case 402 is
The end surface of is brought into contact with the end surface of the step portion 413 of the guide member 406 to be positioned, and the assembly is completed.

At this time, a plurality of lips 409 axially provided on the inner periphery of the seal member 401 are in sealing contact with the outer peripheral surface of the cylindrical portion 412 of the guide member 406. The seal lip 408 of the seal member 401 slidably sealingly contacts the outer peripheral surface of the shaft 403.

Further, the flange portion 4 of the outer can case 402.
Reference numeral 04 is a seat against which a spring (not shown) abuts.

[0034]

By the way, in the above-mentioned first and second conventional examples, the seal members 101, 20 are provided.
The outer case cases 102 and 202 to which 1 is attached are metal-fitted to the guide members 106 and 206.
Therefore, since the notches 110 and the crimping portions 210 provided in the axially intermediate portions of the outer can cases 102 and 202 crimp the outer peripheries of the guide members 106 and 206, the outer can cases 102 and 202 and the guides. Since the fitting portion of the members 106 and 206 is a so-called metal touch, the tolerance between the outer can cases 102 and 202 and the guide members 106 and 206 must be tight.

In the third and fourth conventional examples, the seal members 301 and 401 are rubber-fitted to the outer circumferences of the guide members 306 and 406 by the outer can cases 302 and 402. Therefore, the axial lengths of the seal members 301 and 401 are required, and the axial lengths of the seal lips 308 and 408 that are in sliding contact with the outer peripheral surfaces of the shafts 303 and 403 are long. Thereby, the seal member 301,
It is necessary to change the engine mechanism related to the 401, which in turn leads to a drastic change in the production line.

Further, in the third and fourth conventional examples, since the seats of the springs are provided in the outer can cases 302 and 402, the springs of the springs are changed depending on the size of the seat in the radial direction and the axial position. It becomes necessary to change the diameter, the set load, or the like, or to change the positions of the end surface of the engine head 307 and the end surface of the step 413 of the guide member 406.

From the above, the application of the sealing device is limited and lacks versatility.

Further, in the first and second conventional examples, after the outer can cases 102 and 202 are assembled to the guide members 106 and 206, the step of crimping with the notch 110 and the crimping portion 210 is performed. Assembling is complicated because it is necessary.

In addition, since the caulking portion interferes with the guide members 106 and 206 during the assembling of the outer can cases 102 and 202, the caulking portion is particularly depressed during use after the assembling, and the outer can case is 102, 202 and guide member 10
There is play between 6,206. This allows the outer can 1
Seal members 101, 2 attached to 02, 202
The sealing performance of No. 02 becomes unstable and the sealing property is deteriorated. Therefore, the outer can case 102 is to have strength, requires quenching, and is complicated to manufacture.

Further, even in the outer can cases 302 and 402 provided with the spring seats in the third and fourth conventional examples, the spring force is applied to the seats, so that the strength is given. Quenching is required and manufacturability is poor.

The present invention has been made to solve the above-mentioned problems of the prior art. The purpose of the present invention is to facilitate the manufacture and assembly, and to provide a sealing device having excellent versatility. To provide.

[0042]

In order to achieve the above object, in the present invention, a seal member having a seal lip slidably sealingly contacting the outer peripheral surface of a reciprocating movable shaft, and the seal member. A guide member having a mounting surface on which the movable shaft is inserted, an insertion hole into which the movable shaft is inserted, and a groove portion provided on an outer periphery at a predetermined axial position, and a mounting portion to which the seal member is mounted. A tubular body fitted to the outer periphery of the guide member, the movable shaft being
Both the insertion hole into which the guide member is inserted and fixed, and the groove
The claw provided at the lower end of the tubular body facing the groove portion in the groove portion.
The guide part that guides and crimps
When fitting the tubular body to the outer periphery of the guide member
The claw is guided and caulked in the groove,
It is characterized in that the tubular body is positioned .

Further , it is preferable that the inclination of the tapered surface provided on the guide portion is larger than the inclination of the tapered surface provided on the groove portion.

In the sealing device having the above structure, the seal member is placed on the placing surface of the guide member, and in this state, the tubular body is fitted to the outer periphery of the guide member, and the lower end of the tubular body is fitted. By crimping the claw provided on the outer peripheral surface of the guide member at a groove provided at a predetermined position in the axial direction, the sealing member is sandwiched between the mounting portion provided on the tubular body and the mounting surface of the guide member, and the guide is provided. It is assembled to the member. At this time, the seal lip of the seal member slidably sealingly contacts the outer peripheral surface of the movable shaft reciprocally inserted into the insertion hole of the guide member.

As described above, the claw provided at the lower end of the tubular body is caulked in the groove portion of the guide member so that the sealing member is sandwiched between the mounting portion of the tubular body and the mounting surface of the guide member. Since it is not necessary to mount by fitting as in the prior art, it is not necessary to tighten the tolerance for fitting the tubular body and the guide member. As a result, manufacturing becomes easy.

Further, as described above, since the seal member is mounted on the mounting surface of the guide member and then sandwiched by the mounting portion of the cylindrical body, the seal member is mounted, so that the guide member can be mounted on the mating mounting member. Since there is no need for positioning, the engine head need not be changed, and the degree of freedom in setting the axial length of the seal lip in sliding contact with the movable shaft is increased. From these things, the applicable range is expanded and a sealing device excellent in versatility can be provided.

By providing a guide portion for guiding the claw provided at the lower end of the tubular body to the groove of the guide member on the mating mounting member, the claw guides when the tubular body is assembled to the outer periphery of the guide member. Since it is guided by the part and caulked in the groove, it is easy to assemble and the caulking process can be reduced,
Easy to manufacture.

Further, since the seal member is attached by crimping the claws as described above, it is not necessary to give strength to the material of the entire tubular body, so that it is not necessary to perform quenching as in the conventional case. , Easy to manufacture.

[0049]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. In FIG. 1, which shows a sealing device according to an embodiment of the present invention, reference numeral 1 denotes the entire sealing device. In this embodiment, as in the case of the prior art, it is used, for example, in a shaft sealing portion of an engine mechanism. It is composed.

The sealing device 1 generally has a seal member 4 having a seal lip 3 slidably sealingly contacting an outer peripheral surface of a movable shaft (hereinafter referred to as a shaft) 2 and a mounting surface on which the seal member 4 is mounted. A tubular member having a guide member 5 having an insertion hole 52 into which the shaft 2 is reciprocally inserted, and an attachment portion fitted to the outer periphery of the guide member 5 and to which the seal member 4 is attached. And an outer can case 6 as

The outer can case 6 is a metal tubular body, and is shown in FIG.
As shown in FIG. 3, the opening at the upper end has a radially inward flange portion 61, and the lower end is provided with a plurality of downwardly extending claws 7 (two equal distributions in this embodiment).

The guide member 5 into which the outer can case 6 is fitted is a tubular member having an insertion hole 52 into which the shaft 2 is reciprocally inserted, the outer diameter of which is the cylinder of the outer can case 6. It is almost the same as the inner diameter of the portion 62. The mounting surface 51 on which the seal member 4 is mounted is substantially flat,
The outer peripheral edge is tapered. Further, on the outer peripheral surface, a groove portion 53 that opens radially outward is formed at a predetermined position in the axial direction.

The groove portion 53 has a trapezoidal cross-section having tapered surfaces 54 and 55 at both ends in the axial direction which become smaller inward in the radial direction.

The seal member 4 is made of a rubber-like elastic material, and has a mounting portion 41 mounted on the mounting surface 51 of the guide member 5 and a seal lip 3 slidably sealingly contacting the outer peripheral surface of the shaft 2. Made of.

The mounting portion 41 has a rectangular cross section and is provided with a seal lip 3 extending axially from the inner peripheral portion thereof. The seal lip 3 has a wedge-shaped cross section, and a spring 8 that applies a tightening force to the shaft 2 is attached to the outer periphery of the seal lip 3.

Now, the assembly of the seal member 4 with the outer can case 6 to the shaft 2 will be described with reference to FIG.

The shaft 2 is reciprocally inserted into the insertion hole 52 of the guide member 5, and this guide member 5 is inserted and fixed together with the shaft 2 into the insertion hole 91 of the engine head 9 as a mating attachment member. ing. At this time, the end surface 92 of the engine head 9 is located slightly above the upper opening edge of the groove portion 53 of the guide member 5. Further, the opening end of the insertion hole 91 of the engine head 9 is a tapered surface 93 whose diameter increases outward in the axial direction.

The inclination of the tapered surface 93 of the engine head 9 is slightly larger than the inclination of the tapered surface 54 of the groove 53 of the guide member 5.

The guide member 5 is attached to the engine head 9.
The mounting portion 41 of the seal member 4 is mounted on the mounting surface 51 of the guide member 5 in a state in which is positioned. After that, when the outer can case 6 is fitted on the outer periphery of the guide member 5, the claw 7 provided at the lower end of the outer can case 6 is tapered by the tapered surface 93 of the engine head 9 in the groove portion 53 of the guide member 5. Guided to abut surface 54. At this time, since the tapered surface 93 of the engine head 9 is larger than the inclination of the tapered surface 54 of the groove portion 53, the claw 7 of the outer can case 6 is crimped to the groove portion 53 and the outer can case 6 is
Positioned with respect to.

By thus crimping the claw 7 into the groove portion 53, the mounting portion 41 of the seal member 4 is sandwiched between the flange portion 61 of the outer can case 6 and the mounting surface 51 of the guide member 5 to seal. The member 4 is assembled to the guide member 5. At this time, the outer peripheral portion of the mounting portion 41 is mounted on the mounting surface 51 of the guide member 5.
Has cut into the taper part of the outer peripheral edge. Therefore, the flange portion 61 serves as a mounting portion for the seal member 4.

By mounting the seal member 4 in this manner, the seal lip 3 of the seal member 4 is moved to the guide member 5.
The outer peripheral surface of the shaft 2 reciprocally inserted into the insertion hole 51 is slidably and sealingly contacted.

In the sealing device having the above structure, the claw 7 provided at the lower end of the outer can case 6 is provided with the groove 53 of the guide member 5.
By caulking, the mounting portion 41 of the seal member 4 is joined by the flange portion 61 of the outer can case 6 and the mounting surface 51 of the guide member 5.
Is sandwiched and installed. As described above, since the mounting is not performed by fitting as in the prior art, it is not necessary to tighten the tolerance for fitting the outer can case 6 and the guide member 5, and for example, light fitting or loose fitting may be performed. ,
Easy to manufacture.

Since the seal member 4 is attached by being sandwiched as described above, the seal performance is stable and the sealability is improved regardless of the fitting force between the outer can case 6 and the guide member 5. To do.

In addition, since the seal member 4 does not need to be vulcanized and bonded to the outer case 6, it is easy to manufacture.

Since the mounting portion 41 of the seal member 4 is mounted on the mounting surface 51 of the guide member 5 as described above, it is mounted by being sandwiched by the flange portion 61 of the outer can case 6, Since the positioning of the outer can case 6 and the engine head 9 is irrelevant, there is no need to change the engine head 9 and the degree of freedom in setting the axial length of the seal lip 3 slidingly contacting the shaft 2 is high. Become. From these things, the applicable range is expanded and a sealing device excellent in versatility can be provided.

Then, the outer head case 6 is attached to the engine head 9.
Since the pawl 7 provided on the lower end of the guide member 5 has a tapered surface 93 as a guide portion for guiding the groove portion 53 of the guide member 5, when the outer can case 6 is assembled on the outer periphery of the guide member 5, the pawl 7 is tapered. Since it is guided by 93 and is caulked in the groove portion 53, the assembling becomes easy, and the assembling property can be improved. Further, since the caulking process can be reduced, the manufacturing can be facilitated.

Furthermore, since the seal member 4 is attached by crimping the claw 7 as described above, the outer can case 6
Since it is not necessary to give strength to the entire material, it is not necessary to perform quenching as in the conventional case, and the manufacturing is easy.

When the outer can case has a spring seat, the outer can case 6A as shown in FIG. 4 is used.
It should be done. That is, the flange portion 63 extending radially outward may be provided at the lower end of the tubular portion 62A.

In this case, by caulking the claw 7 in the groove of the guide member, the flange 63, which serves as the spring seat of the outer case 6A, is axially positioned. Therefore,
As shown in the above-mentioned third and fourth conventional examples, it is not necessary to position the spring seat by contacting the end face of the mating mounting member. It is possible to provide a sealing device having a wide range of applications with members and excellent in versatility.

Further, since the structure and operation of the outer can case 6A are the same as those of the outer can case 6 described above, the same effects as those of the outer can case 6 described above can be obtained.

In the above embodiment, in order to improve the assemblability, the engine head 9 as the mating mounting member is provided with the tapered surface 93 as the guide portion, but the assemblability is not shown. Although it may be a little worse, the seal member can be assembled by simply crimping the claw into the groove even if there is no guide part, so it is easier to assemble than the prior art, so even if there is no guide part good.

[0072]

As described above, according to the present invention, the claw provided at the lower end of the tubular body is caulked in the groove portion of the guide member so that the mounting portion of the tubular body and the mounting surface of the guide member can be formed. The seal member can be sandwiched between and attached. As described above, since the mounting is not performed by fitting as in the prior art, it is not necessary to tighten the tolerance for fitting the tubular body and the guide member, and the manufacturing is facilitated.

Furthermore, since the seal member is attached by being sandwiched as described above, the seal performance is stable and the sealability is improved regardless of the fitting force between the tubular body and the guide member. You can

Further, as described above, since the seal member is mounted on the mounting surface of the guide member and then sandwiched between the mounting portions of the tubular body, the seal member is mounted. It has nothing to do with positioning. This eliminates the need for changing the engine head, for example, and increases the degree of freedom in setting the axial length of the seal lip that is in sliding contact with the movable shaft. From these things, the applicable range is expanded and a sealing device excellent in versatility can be provided.

By providing a guide portion for guiding the claw provided at the lower end of the tubular body to the groove of the guide member on the mating attachment member, the claw guides when the tubular body is assembled to the outer periphery of the guide member. Since the groove is guided by the portion and the groove is crimped, the assembling becomes easy, and the assembling property can be improved. Moreover, since the caulking process can be reduced, the manufacturing can be facilitated.

Further, since the sealing member is attached by crimping the claws as described above, it is not necessary to give strength to the material of the entire tubular body, and thus it is not necessary to perform quenching as in the conventional case. , Easier to manufacture.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts in a state where a sealing device according to an embodiment of the present invention is incorporated into a shaft.

FIG. 2 is a cross-sectional view of essential parts showing the assembly of the sealing device of FIG.

3 (a) is a cross-sectional view of an outer can case of the sealing device of FIG. 1, and FIG. 3 (b) is a bottom view.

FIG. 4 (a) shows another outer case, which is a cross-sectional view taken along the line AA of FIG. 4 (b), and FIG. 4 (b) is a bottom view.

FIG. 5 is a cross-sectional view of a sealing device according to a first conventional example.

FIG. 6 is a sectional view of a sealing device according to a second conventional example.

FIG. 7 is a sectional view of a sealing device according to a third conventional example.

FIG. 8 is a cross-sectional view of essential parts of a sealing device according to a fourth conventional example.

[Explanation of symbols]

1 Sealing device 2 axes (movable axis) 3 seal lip 4 Seal member 41 Placement section 5 Guide member 51 Placement surface 52 insertion hole 53 groove 54,55 Tapered surface 6,6A outer can case (cylindrical body) 61 Flange part (mounting part) 62, 62A tubular part 63 Flange 7 nails 8 springs 9 engine head (counterpart mounting member) 91 insertion hole 92 End face 93 Tapered surface (guide)

Claims (2)

(57) [Claims] 1. A seal member having a seal lip slidably sealingly contacting an outer peripheral surface of a reciprocating movable shaft, a mounting surface on which the seal member is mounted, and an insertion hole into which the movable shaft is inserted. A guide member having a groove portion provided at an outer periphery at a predetermined position in the axial direction, and a cylindrical body having an attachment portion to which the seal member is attached and fitted to the outer periphery of the guide member. In the sealing device, the guide member is inserted and fixed together with the movable shaft.
A hole and provided at the lower end of the tubular body facing the groove.
The other side having a guide portion that guides the claw to the groove portion and crimps it.
The tubular member is attached to the outer circumference of the guide member by the mounting member.
When mating, the pawl is guided in the groove and
The sealing device is characterized in that the tubular body is positioned . 2. An inclination of a taper surface provided on the guide portion
Is larger than the inclination of the tapered surface provided in the groove.
The sealing device according to claim 1, wherein: