JP6513558B2 - Sealed structure - Google Patents

Description

  The present invention relates to a sealing structure.

Generally, in the case of sealing between a mounting member having a hole into which a rotating body such as a shaft is inserted and a rotating body inserted into the hole, after mounting a seal in a seal groove, the rotating body is inserted. It was However, large devices and the like have the risk of damaging or damaging the seal during assembly operations. It has been necessary to disassemble the device when replacing a damaged or damaged seal or a seal that has worn after a predetermined use. In a large apparatus, this disassembly work takes time. Therefore, conventionally, there is an oil seal which can perform seal replacement without omitting the side wall of the seal groove and performing the above-mentioned disassembly (for example, see Patent Document 1).

However, the oil seal consists of rubber, a metal ring and a coil spring and is pressed into the seal groove, and the cross-sectional dimension (cross-sectional area) of the seal itself is large. Along with this, the seal groove also becomes large. And the need to form a rubber ring by installing a metal ring in the mold, and after that a coil spring must also be attached, which is troublesome and costly to manufacture There was a drawback.

JP, 2010-48284, A

The problem to be solved is that, in the case of sealing between a rotating body such as a shaft and a mounting member, the rotating body is inserted after the seal is mounted in the seal groove, so a large apparatus etc. There is a risk of damaging or damaging the device and it is necessary to disassemble the device in order to replace the seal.

Therefore, in the sealing structure according to the present invention, the seal groove is integrally formed at the opening end of the rotary member insertion hole of the mounting member, and the low protrusion is integrally formed at the opening end of the seal groove. The X ring can be attached to the seal groove freely in the rotor assembly assembled state in which the body is inserted into the hole, and the X ring is provided so as to protrude from the central body and the central body in four directions. a cross-sectional shape having a sealing projection, in the transverse plane of the X ring free state, the entire radial dimension of the X ring and Z _1, the radial dimension of the central body portion and the Z ₀ Then, the height dimension of the projection represented by (Z ₁ -Z ₀ ) / 2 is set smaller than the height dimension of the low ridge portion, and the X ring is attached to the seal groove. In the seal mounted state, the X ring is held off by the low protrusion.
Further, the height dimension of the low-profile portion is set to 5% or more and 26% or less of the depth dimension of the seal groove.
Further, an induction tapered surface which is expanded radially outward on the inner peripheral surface side of the low ridge portion is formed to guide the X ring when the X ring is mounted, and the induction tapered surface Is set to 10 ° or more and 45 ° or less.

Further, the rotating body is rotatably supported by bearing means which receives loads in both axial directions.
Further, the mounting member is a reduction gear outer cylinder, and the rotating body is a reduction gear carrier provided with a plurality of gears.

According to the sealing structure of the present invention, the seal (X ring) can be attached after assembling the device (after inserting and assembling the rotating body into a mounting member such as a casing), and the device is disassembled. Since the X-ring can be replaced without any problem, the workability can be greatly improved. In addition, since the X ring is made of a single rubber, it is inexpensive as compared with the case of oil seal, it is easy to manufacture, the seal groove of the mounting member can be small, and it contributes to the downsizing of the mounting member (device). Do.

It is a principal part cross-sectional front view which shows the use condition of one Embodiment of this invention. It is a principal part cross-sectional front view which shows the rotary body assembly state and each part dimension relationship before X ring attachment. It is a side view of the X ring which explained the order of wearing. It is explanatory drawing which shows the mounting procedure of X-ring. It is explanatory drawing which shows the mounting procedure of X-ring. It is explanatory drawing which shows the mounting procedure of X-ring. It is explanatory drawing which shows the mounting procedure of X-ring. It is principal part sectional drawing which showed the specific example of a use location.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
1 and 2 show an embodiment of the present invention. In this sealing structure, the seal groove 4 is integrally formed at the opening end of the rotary member insertion hole 2 of the mounting member 1, and the low protrusion (the hooked stepped portion) 6 is formed at the opening end 5 of the seal groove 4. Are integrally formed, and the rubber X ring 8 can be mounted on the seal groove 4 freely in the rotor assembled state (right half in FIG. 2) in which the rotor 7 such as a shaft is inserted into the hole 2 In the seal mounting state (FIG. 1) in which the X ring 8 is mounted in the seal groove 4, the X ring 8 is prevented from being removed by the low protrusion portion (the hooked step portion) 6.

Overall radial dimension Z ₁ of X ring 8 105% or more of depth dimension H ₀ of seal groove 4
Set to 125% or less. If less than 105% of the radial dimension Z ₁ is the depth H _0, sealability becomes insufficient. If radial dimension Z ₁ exceeds 125% of depth dimension H ₀ , X ring 8
That the instrumentation Chakusuru to seal groove 4 becomes difficult.

The height dimension A of the low protrusion portion 6 is set to 5% or more and 26% or less of the depth dimension H ₀ of the seal groove 4. Height A is in the case of less than 5% of the depth H _0, X-ring 8 for withdrawing to the left in FIG. 1 (axial outward), pressure resistance is insufficient. If the height dimension A exceeds 26% of the depth dimension H ₀ , the X ring 8 can not be attached to the seal groove 4 under the rotating body assembled state.

  An induction tapered surface 10 is formed on the side of the inner circumferential surface 9 of the low ridge portion 6 so as to axially expand outward, and the X ring 8 is guided when the X ring 8 is attached. The inclination angle θ of the induction tapered surface 10 is set to 10 ° or more and 45 ° or less. More preferably, the inclination angle θ is 15 ° or more and 35 ° or less. If the inclination angle θ is out of the above range, the X ring 8 can not be easily guided when the X ring 8 is attached.

In further detail, as shown in the cross-sectional view of FIG. 2, the X-ring 8 has a substantially rectangular central body portion 18 and a (small circle type) seal projecting from the central body portion 18 in four directions. It is a cross-sectional shape which has the protrusion 20,20,20,20. Assuming that the overall radial dimension of the X ring 8 is Z ₁ and the radial dimension of the central body 18 is Z _{0 in} the cross section of the X ring 8 in the free state (see the left side of FIG. 2) the (Z ₁ -Z ₀₎ / 2 height Z ₂₀ of the projections 20 represented by the than the height a of the low ridges 6 and smaller.
Conversely speaking, the height dimension A of the low protrusion portion 6 is larger than the height dimension Z _{20 of the} projection 20 represented by (Z ₁ -Z ₀ ) / 2.
As a result, the protrusion 20 hooked to the low protrusion portion 6 of the X ring 8 does not separate at the time of use,
The X ring 8 is stably held in the seal groove 4.

Next, a method of mounting the X-ring 8 will be described with reference to FIGS. First, as shown in FIG. 4, a part of the X ring 8 (the circumferential position of (1) in FIG. 3) is pushed into the seal groove 4. Next, as shown in FIG. 5, a portion of the circumferential position (position of (2) in FIG. 3) opposed to the above-mentioned part of the X ring 8 is pushed into the seal groove 4. Subsequently, as shown in FIG. 6, the portions (3) and (4) of FIG. 3 are pushed into the seal groove 4. Finally, as shown in FIG. 7, (5) (6) (7) (8) in FIG.
(The remaining part) is pushed into the seal groove 4 to complete the insertion of the X ring 8 into the seal groove 4. As shown in FIG. 4 to FIG. 7, the work of pushing in the X ring 8 one by one is carried out manually by the operator, by using a working tool (jig) or by using an automatic pushing device. Do.

Next, FIG. 8 exemplifies the case where the rotating body 7 is the carrier 12 of the reduction gear. That is, FIG. 8 shows a part of an eccentric rocking gear (a reduction gear), and a reduction gear outer cylinder 13 fixed to one of the other members, and is disposed in the outer cylinder 13 and the other And a carrier 12 fixed to the other member. A crankshaft (not shown) passes through the center of the carrier 12. Further, the carrier 12 rotates around the uniaxial center L ₀ relative to the outer cylinder 13 by the swinging rotation of the swinging gear attached to the eccentric portion of the crankshaft.
That is, in FIG. 8, the mounting member 1 described in FIGS. 1 to 8 is the reduction gear outer cylinder 13, and the rotating body 7 is the reduction gear carrier 12 provided with a plurality of gears 14.

Then, as shown on the left side of FIG. 8, the X ring 8 is attached to the seal groove 4 at the opening end of the insertion hole 2 of the outer cylinder 13 (attachment member 1). The shapes and dimensional relationships of the seal groove 4 and the X ring 8 are the same as those described with reference to FIGS.
In FIG. 8, the rotating body 7 is rotatably supported by bearing means G which receives a load in the axial direction (arrow X). In the illustrated example, the above-described bearing means G is configured by two angular contact ball bearings 15 and 16.

Further, specifically, one of the angular contact ball bearing 15 is disposed in the vicinity of the X-ring 8, the inner ring 15A abuts against the stepped portion 21 of the rotary member 7 (carrier 12), the direction of arrow X ₁ giving regulating force of the stepped portion 21, also other angular contact ball bearings 16 are disposed on the opposite side of the hole 2 the mounting member 1 (the outer cylinder 13), the rotating body 7 (carrier 12) The inner ring 16A abuts on the stepped portion 22 to apply a restricting force in the arrow X ₂ direction to the stepped portion 22 so that both arrows X ₁ and X ₂ directions --- an axial direction X along the axial center L ₀ The movement of the rotating body 7 (carrier 12) is restricted to-.

Thus, a structure in which the mounting member 1 (outer cylinder 13) and the rotating body 7 (carrier 12) are rotatably supported by bearings 15 and 16 (bearing means G) receiving a load in the axial direction X. If so, even if the height dimension A is a small value of the low ridge portion 6 of the present invention, the X ring 8 does not unexpectedly protrude from the seal groove 4.
In addition, as a use place (applicable apparatus) of this invention, not only the reduction gear (gear apparatus) as shown in FIG. 8 but various fluid apparatus which has a rotating shaft, an electric motor, a transmission etc. can be mentioned. . Alternatively, the present invention can be applied to a device in which the rotating body 7 also moves in the axial direction at low speed.
In addition, angular ball bearings 15 and 16 as the above-mentioned bearing means G may be used as angular ball bearings, spherical ball bearings, thrust ball bearings, tapered roller bearings, spherical ball bearings, or flanged ball bearings (steps It may also be desirable to use a sliding bearing or the like.

The following X ring 8 is manufactured using FKM (vinylidene fluoride-based fluororubber, JIS K 6253 durometer type A hardness 80) as a material, the rotation outside diameter is φ50, and the depth dimension of the seal groove 4 H ₀ To the seal groove 4 in each case where the height dimension A (dimension A) of the low ridge portion 6 is 5.5 mm and 0 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm and 1.6 mm, respectively. Whether it can be mounted or not, and its pressure resistance were examined. Specifically, the dimensions of the X-ring 8, 2.8 mm and axial dimensions Y ₀ of the center portion shown in FIG. 2, the overall axial dimension Y ₁ 4.4 mm, the radial dimension Z ₀ of the central portion 4.6 mm, the overall radial dimension Z ₁ was 6.45 mm. The X ring 8 was (i) mountable to the rotor assembled state, and (ii) pressurized to 0.3 MPa, held for 3 minutes, and checked for leakage (desorption of the X ring). In addition, lithium soap based grease was thinly applied to the rotating body 7 as a lubricant.

According to the test results, when the A dimension is 0 mm, the pressure resistance of 0.3 MPa was not satisfied. Further, one having a dimension A of 1.6 mm could not be attached to the seal groove 4. The A dimensions of 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm and 1.4 mm were all able to be attached to the seal groove 4 and satisfy the pressure resistance of 0.3 MPa. From this test result, the height dimension A of the low ridge portion 6 is 10.9% (when the dimension A is 0.6 mm) or more 25.5% (when the dimension A is 1.4 mm) of the depth dimension H ₀ of the seal groove 4 The one set as follows is suitable for mounting on the seal groove 4 and satisfying a pressure resistance of 0.3 MPa.

The following X ring 8 is manufactured using NBR (nitrile rubber, JIS K 6253 durometer type A hardness 80) as a material, the rotation outside diameter is φ63, the depth dimension H ₀ of the seal groove 4 is 5.0 mm, And, when the height dimension A (dimension A) of the low ridge portion 6 is 0 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, the sealing groove 4 is Whether or not it was mounted and its pressure resistance were examined. Specifically, the dimensions of the X-ring 8, 3.8 mm and axial dimensions Y ₀ of the center portion shown in FIG. 2, the overall axial dimension Y ₁ 6.2 mm, the radial dimension Z ₀ of the central portion 4.2 mm, the overall radial dimension Z ₁ was 5.75 mm. The X ring 8 was (i) mountable to the rotor assembled state, and (ii) pressurized to 0.3 MPa, held for 3 minutes, and checked for leakage (desorption of the X ring). In addition, lithium soap based grease was thinly applied to the rotating body 7 as a lubricant.

The test results showed that the A dimension of 0 mm and 0.2 mm did not satisfy the pressure resistance of 0.3 MPa.
In addition, one having an A dimension of 1.0 mm could not be attached to the seal groove 4. In the case of A dimensions of 0.25 mm, 0.3 mm, 0.4 mm, 0.6 mm and 0.8 mm, mounting to the seal groove 4 was possible, and a pressure resistance of 0.3 MPa was satisfied. From this test result, the height dimension A of the low ridge portion 6 is 5.0% (when A dimension is 0.25 mm) or more and 16.0% (when A dimension is 0.8 mm) of depth dimension H ₀ of seal groove 4 The one set as follows is suitable for mounting on the seal groove 4 and satisfying a pressure resistance of 0.3 MPa.

Further, according to the first embodiment and the second embodiment, when the ratio of the height dimension A to the depth dimension H ₀ is small, the horizontally long X ring 8 is suitable, and the depth dimension H ₀ of the height dimension A When the ratio to is large, it is understood that the elongated X ring 8 is suitable. Further, it can be seen that the X ring 8 is preferably in the form of an elongated form in terms of the attachment of the X ring 8 to the seal groove 4, and the form of the X ring 8 in the form of an elongated form is preferable in terms of pressure resistance. In practice, the aspect ratio of the X ring 8 is set to a ratio according to the mounting property and the required pressure resistance.

In the present invention, the design can be changed, and for example, the aspect ratio of the X ring may be 1.

As described above, according to the present invention, the seal groove 4 is integrally formed at the opening end of the rotary member insertion hole 2 of the mounting member 1 and the low protrusion portion 6 is integrally formed at the opening end 5 of the seal groove 4. The X ring 8 can be mounted on the seal groove 4 in the rotor assembled state in which the rotor 7 is inserted into the hole 2 and the X ring 8 is mounted on the seal groove 4 The X ring 8 can be attached after assembling the device (after inserting the rotating body 7) since the X ring 8 is held off by the low ridges 6 in the seal attached state, and the device Since the X ring 8 can be replaced without disassembling, the workability can be greatly improved. In particular, since it can be installed after assembling the device, it is suitable for a place where an oil seal has been used up to now or a place where replacement work is frequently performed. Further, since the X ring 8 is made of a single rubber, the cross section of the seal can be smaller than in the case of the oil seal, and accordingly, the mounting member 1 can be made compact, and the manufacture is easy. It is cheap.

In addition, the height dimension A of the low-profile portion 6 is 5% to 26% of the depth dimension H ₀ of the seal groove 4.
Since the following setting is made, mounting to the seal groove 4 is possible, and an appropriate pressure resistance is provided.
Further, an induction tapered surface 10 is formed on the inner peripheral surface 9 side of the low ridge portion 6 so as to axially expand outward, and the X ring 8 is guided when the X ring 8 is mounted. Since the inclination angle θ of the induction tapered surface 10 is set to 10 ° or more and 45 ° or less, the X ring 8 can be smoothly and easily introduced to the seal groove 4 when the X ring 8 is attached. .

The X-ring 8 has a cross-sectional shape having a central body 18 and sealing projections 20, 20, 20, 20 projecting from the central body 18 in four directions. Assuming that the overall radial dimension of the X ring 8 is Z ₁ and the radial dimension of the central body portion 18 is Z _{0 in} the cross section of the X ring 8, then (Z ₁ −Z ₀ ) / 2 Since the height dimension Z ₂₀ of the protrusion 20 to be set is set smaller than the height dimension A of the low protrusion portion 6, the sealing protrusion 20 of the X ring 8 may be elastically deformed excessively. This can prevent the X ring 8 from coming out of the seal groove 4.

Further, since the rotating body 7 is rotatably supported by the bearing means G receiving loads in both axial directions, the rotating body 7 does not move in the axial direction, and the X ring 8 is sealed. It is possible to further prevent the protrusion from the groove 4.
Further, since the mounting member 1 is the reduction gear outer cylinder 13 and the rotating body 7 is the reduction gear carrier 12 provided with a plurality of gears 14, the reduction gear can be made compact.

DESCRIPTION OF SYMBOLS 1 Mounting member 2 (For rotary body insertion) hole part 4 Seal groove 5 Opening end 6 Low protrusion part (hooked stepped part)
7 Rotor 8 X Ring 9 Inner circumferential surface
10 induction taper surface
12 career
13 Outer cylinder
18 Central body
20 projection A height dimension G bearing means H ₀ depth dimension θ inclination angle

Claims (5)

A seal groove (4) is integrally formed at the opening end of the rotary member insertion hole (2) of the mounting member (1), and a low protrusion (6) is formed at the opening end (5) of the seal groove (4). , And the X ring (8) can be freely mounted in the seal groove (4) in the rotor assembled state where the rotor (7) is inserted into the hole (2) ,
The X-ring (8) has a central body portion (18) and a sealing projection (20) (20) (20) (20) projecting from the central body portion (18) in four directions. Surface shape,
In the cross section of the X ring (8) in the free state, the overall radial dimension of the X ring (8) is (Z ₁ ), and the radial dimension of the central body portion (18) is (Z ₀ ) Then, the height dimension (Z ₂₀ ) of the protrusion (20) represented by (Z ₁ -Z ₀ ) / 2 is smaller than the height dimension (A) of the low protrusion portion (6) Set,
Sealed structure characterized in that the X ring (8) is held by the low ridge portion (6) in a seal mounted state in which the X ring (8) is mounted in the seal groove (4). . The sealing structure according to claim 1, wherein the height dimension (A) of the low ridge portion (6) is set to 5% or more and 26% or less of the depth dimension (H ₀ ) of the seal groove (4).   An induction tapered surface (10) is formed on the inner peripheral surface (9) side of the low ridge portion (6) to axially expand outward, and the X ring (8) is mounted when the X ring (8) is attached. The sealing structure according to claim 1 or 2, wherein the angle of inclination (θ) of the induction tapered surface (10) is set to 10 ° or more and 45 ° or less. A sealing structure according to claim 1, 2 or 3, wherein said rotating body (7) is rotatably pivotally supported by bearing means (G) receiving loads in both axial directions . The mounting member (1) is a reduction gear outer cylinder (13),
The rotating body (7) is sealed structure Zotai according to claim 4, wherein the reduction gear carrier having a plurality of gear (14) (12).

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