JP4823115B2 - Installing the seal ring - Google Patents

Description

  The present invention relates to a seal ring mounting method in which, for example, an annular seal ring that seals between a piston and a piston is mounted in an annular seal groove formed in an inner diameter portion of a cylindrical cylinder body.

When mounting an annular seal ring that seals between the piston that slides inside the cylinder body in the annular seal groove formed in the inner diameter of the cylindrical cylinder body, the seal ring is bent in the direction of diameter reduction. Insert it into the cylinder body.
Up to now, tools shown in FIGS. 9 and 10 have been proposed as jigs for inserting the seal ring into the cylinder body while maintaining the state in which the seal ring is bent in the reduced diameter direction.

  The jig 1 shown in FIG. 9 is disclosed in the following Patent Document 1, and forms a ring holding groove 2b on the outer periphery of the disk 2a, and at the center of the disk 2a from a predetermined portion on the ring holding groove 2b. A facing recess 2c is formed to form a seal ring holding portion 2, and a support rod 3 is provided in the axial direction of the seal ring holding portion 2, and the support rod 3 is provided with a ring locking portion at the tip thereof. The portion of the seal ring 5 mounted in the ring holding groove 2b is recessed by operating the ring locking portion with the operation rod 4 by supporting the operation rod 4 so as to be movable back and forth in the axial direction. The seal ring 5 is reduced in diameter by being bent into 2c to facilitate the operation of inserting the seal ring 5 into the cylinder body 6 and the seal ring 5 bent into the recess 2c is released to thereby release the seal ring 5c. The elastic restoring force of 5 Attaching it to Ndabodi 6 of the sealing groove 6a in.

  A jig 11 shown in FIG. 10 is disclosed in Patent Document 2 below, and a holding portion 12a for holding a part of the seal ring 5 by a first protruding portion 15 and a second protruding portion 16 and the holding portion. A seal member holding means 12 having a rod-like rod-like portion 12b to which a portion 12a is attached, and a cylindrical seal pushing means fitted and mounted on the radially outer side of the rod-like portion 12b and movable in the axial direction of the rod-like portion 12b 14 and a position regulating cylinder 19 which is mounted on the outer periphery of the seal pushing means 14 and regulates the distance from one end thereof to the first projection 15.

  The seal pushing means 14 is connected to an operating shaft 17 slidably fitted in the rod-shaped portion 12b via a connecting means 18, and moves on the rod-shaped portion 12b by operating the operating shaft 17.

  The jig 11 pushes the seal ring 5 held by the holding portion 12a into the cylinder body 6 by the operating shaft 17 in a state where the tip of the position regulating cylinder 19 is pressed against the inner diameter end portion of the cylinder body 6. Then, the seal ring 5 is attached to the seal groove 6 a in the cylinder body 6.

JP-A-8-1540 Japanese Patent Laid-Open No. 2002-355771

  However, each of the jigs 1 and 11 is composed of a large number of components and has a complicated structure, so that there is a problem that the jig itself is expensive.

  Further, in any of the jigs 1 and 11, since the deflection of the jigs 1 and 11 with respect to the axis of the cylinder body 6 cannot be restricted, the jigs 1 and 11 are indicated by arrows A and B in the respective drawings. When the seal ring 5 is removed from the jig while the 11 is swung, the seal ring 5 is inclined with respect to the axis of the cylinder body 6, unlike the posture in which the seal ring 5 is inserted. There is a possibility that it will stick to the inner diameter part of the cylinder body 6 in the posture and cannot be mounted in the seal groove 6a.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and the jig can have a simple structure with few components, and the jig for inserting the seal ring into the cylinder body is a cylinder body. It is an object of the present invention to provide a seal ring mounting method that can be inserted into a cylinder body accurately in an assumed posture without being shaken with respect to a shaft and can be securely mounted in a seal groove.

The above object is achieved by the following configuration.
(1) A seal ring mounting method according to the present invention is a seal ring mounting method in which an annular seal ring is mounted in an annular seal groove formed in an inner diameter portion of a workpiece,
The seal ring coated with a lubricant is inserted into a narrow groove that matches the inner diameter of the pipe that can be fitted into the inner diameter portion of the workpiece, and is deformed into an oval shape.
Next, by pressing the short-diameter portion of the elliptical seal ring and pushing the elliptical seal ring into the pipe, the elliptical seal ring is further bent at the short-diameter portion. Housed in,
Next, the pipe is fitted to the workpiece so that the tip of the pipe located on the opposite side to the short diameter portion of the seal ring accommodated stops before the seal groove to be mounted,
Next, the conical tip of the push rod inserted from the base end side of the pipe is inserted into the arcuate portion on the long diameter side of the elliptical seal ring which is bent at the short diameter portion in the pipe. the sealing ring is pushed out into the workpiece, said by guided substantially simultaneously the sealing groove the arc portions of the pair of the long diameter side of the seal ring, so as to fit in the seal groove by the restoring force of the seal ring Constitute.

  (2) In the configuration described in the above (1), when the seal ring is pushed out from the pipe, an extrusion bar having a conical apex angle formed at the tip is formed as an obtuse angle.

In the seal ring mounting method described above, the jig used when inserting the seal ring into the workpiece is a pipe inserted into the workpiece, and the seal ring inside the pipe is pushed out by being inserted into the pipe. Since it is comprised only with an extrusion rod, a jig | tool can be made into a simple structure with few components.
Also, the pipe, which is a jig for inserting the seal ring into the workpiece, is assumed to fit the inner diameter part of the workpiece without rattling, so that the jig will not swing with respect to the cylinder body axis. The seal ring can be accurately inserted into the workpiece while keeping the posture, and can be securely attached to the seal groove.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a seal ring mounting method according to the invention will be described in detail with reference to the drawings. In the present embodiment, the work is a cylinder body and the seal ring seals between the cylinder body and the piston.
Before describing the method of attaching the seal ring according to the present invention, a cylinder body to which the seal ring is attached by the method of attaching the seal ring according to the present invention will be described.

  FIG. 7 is an explanatory view of a first example of a cylinder body to which the seal ring is attached by the method of attaching the seal ring of the present invention, and FIG. 8 is a first view of the cylinder body to which the seal ring is attached by the method of attaching the seal ring of the present invention. It is explanatory drawing of the example of 2.

The cylinder body 21 shown in FIG. 7 is used for a wheel cylinder that expands a pair of brake shoes in a drum brake device for a vehicle. The cylinder body 21 is formed so as to penetrate through a pair of pistons 22 and 23 with the same diameter. Seal grooves 25 are respectively formed in the vicinity of both ends of the inner diameter portion 24 serving as a bore that is movably accommodated. An annular seal ring 27 that seals between the pistons 22 and 23 is attached to each seal groove 25.
Between the pair of pistons 22 and 23 is a hydraulic chamber 28 to which hydraulic pressure for driving the pistons 22 and 23 is supplied. In the hydraulic chamber 28, the pair of pistons 22 and 23 are separated from each other. A spring 29 is provided for biasing.

The cylinder body 31 shown in FIG. 8 is also used for a wheel cylinder that expands a pair of brake shoes in a drum brake device for a vehicle.
However, in the case of this cylinder body 31, the inner diameter portion 24, which is a bore for slidably housing the pair of pistons 22 and 23, is not the same diameter, but a stopper portion 32 having a reduced diameter is formed in the middle portion. . The stopper portion 32 restricts the rear end positions of the pistons 22 and 23 to prevent the pistons 22 and 23 from being pushed too much. Since the stopper portion 32 is provided, a spring for urging the pistons 22 and 23 away from each other is omitted in the hydraulic chamber 28 defined between the pair of pistons 22 and 23.

  Next, a method for attaching the seal ring of the present invention in which the seal ring 27 is attached to the seal groove 25 of the cylinder body 21 or the cylinder body 31 described above will be described.

  FIG. 1 is a longitudinal sectional view of a seal ring mounted on a cylinder body according to the seal ring mounting method according to the present invention, and FIG. 2 is an explanatory view of a first step of the seal ring mounting method according to the present invention. FIG. 4 is an explanatory view of a second step of the seal ring mounting method according to the present invention, and FIG. 4 is a second step of the seal ring mounting method according to the present invention in a state where the seal ring is inserted into the thin-walled pipe. FIG. 5 is a perspective view of the state shown in FIG. 4, and FIG. 6 is an explanatory view of a third step of the seal ring mounting method according to the present invention.

  The seal ring is attached in such a manner that a seal groove 43 formed in an annular shape in the inner diameter portion of a cylindrical cylinder body 41 shown in FIG. An annular seal ring 45 is attached.

  The cylinder body 41 shown in FIG. 6 corresponds to the cylinder bodies 21 and 31 shown in FIGS. The seal groove 43 corresponds to the seal groove 25 in FIGS. 7 and 8, and the seal ring 45 corresponds to the seal ring 27 shown in FIGS. 7 and 8.

  The seal ring 45 handled in this embodiment is formed in a longitudinal sectional structure having an outer diameter D1 shown in FIG. 1 by an elastic material such as synthetic rubber.

  The seal ring is attached by performing the first step shown in FIG. 2, the second step shown in FIGS. 3 to 5 and the third step shown in FIG. Mount on the body 41.

  In the first step, first, the seal ring 45 preliminarily coated with a lubricant (lubricating oil) is put into the narrow groove 52 of the jig 51 for forming the ring shape, so that the seal ring 45 is made into an oval shape. Deform.

  As shown in FIG. 2, the jig 51 includes a wide groove 53 having a groove width W1 that substantially matches the outer diameter D1 when the seal ring 45 is not deformed upstream, and can be fitted into the inner diameter portion of the cylinder body 41. A narrow groove 52 having a groove width W2 that substantially matches the inner diameter D2 (see FIG. 3) of the thin pipe 61 is provided downstream. The wide groove 53 and the narrow groove 52 are connected by a tapered groove 55 that gradually narrows the groove width from the wide groove 53.

  When the seal ring 45 placed in the wide groove 53 of the jig 51 is moved to the downstream side as indicated by an arrow C, the seal ring 45 is moved by the pressure applied by the lubricant applied to the seal ring 45 and the side surface of the taper groove 55. The seal ring 45 can be deformed into an elliptical shape without difficulty, and when moved to the narrow groove 52, the seal ring 45 is formed into an elliptical shape having a short diameter substantially equal to the inner diameter D2 of the thin pipe 61.

As shown in FIG. 3, a thin pipe 61 is detachably connected to the bottom surface of the narrow groove 52 of the jig 51 through a tapered hole 58 in which the inner diameter in the major axis direction of the seal ring 45 is gradually reduced. ing.
In the second step, as shown by the arrow D in FIGS. 3 and 4, the short diameter portion 47 of the elliptical seal ring 45 formed by the narrow groove 52 is formed at the lower end of the folding rod 57. The oval seal ring 45 is pressed further downward by the helical spatula 57a, and the oval seal ring 45 is pushed into the thin pipe 61 below the narrow groove 52, so that the oval seal ring 45 is further shortened as shown in FIG. The diametrical portion 47 is folded in half and accommodated in the thin pipe 61.

In the third step, the thin pipe 61 containing the seal ring 45 is removed from the jig 51, and instead the thin pipe 61 is fitted and connected to the cylinder body 41 as shown in FIG. In this process, the inner seal ring 45 is moved to the seal groove 43 of the cylinder body 41.
FIG. 6 shows a case where the seal ring 45 is attached to the seal groove 43 on the upper end side among the seal grooves 43 provided near both ends of the inner diameter portion of the cylinder body 41.

In the thin pipe 61, the tip of the thin pipe 61 (the upper end of the thin pipe 61 shown in FIGS. 3 to 5) located on the opposite side to the short diameter portion 47 of the seal ring 45 accommodated is the upper end side of the mounting target. The thin pipe 61 is fitted into the cylinder body 41 so as to stop in front of the seal groove 43.
Next, the seal ring 45 in the thin pipe 61 is pushed out into the cylinder body 41 by the push-out rod 63 whose tip is formed into a conical shape 63a and inserted from the base end side of the thin pipe 61, as shown in FIG. The seal ring 45 that has landed on the inner diameter portion of the cylinder body 41 just before the seal groove 43 is further pushed out toward the seal groove 43 side by the push-out rod 63, so that the seal ring 45 is restored to the inner diameter of the cylinder body 41. If it fits in the seal groove 43 of a part, attachment work is completion.

  When the seal ring 45 is also installed in the other seal groove 43 (the lower end side in FIG. 6) of the cylinder body 41, the first, second, and third steps are performed by changing the direction of the cylinder body 41. repeat.

  In the case of the present embodiment, as the push-out bar 63, a rod having a conical shape 63a at the tip formed at an obtuse angle of about 120 ° is used.

In the seal ring mounting method according to the embodiment described above, the jig used when inserting the seal ring 45 into the cylinder body 41 includes a thin pipe 61 inserted into the cylinder body 41, and the thin pipe 61. Since it is comprised only by the extrusion rod 63 which inserts in and pushes out the seal ring 45 in the thin pipe 61, a jig | tool can be made into a simple structure with few components.
Further, the thin-walled pipe 61 that is a jig for inserting the seal ring 45 into the cylinder body 41 is formed into a cylindrical shape that fits into the inner diameter portion of the cylinder body 41 to which the seal ring 45 is attached without looseness. Since the jig does not swing with respect to the axis of the wheel cylinder, the seal ring 45 can be accurately inserted into the cylinder body 41 in the assumed posture and can be securely attached to the seal groove 43.

  Further, in the method of attaching the seal ring of the present embodiment, the push-out rod 63 that pushes out the seal ring 45 in the thin pipe 61 has an obtuse angle at the apex of the conical shape 63a at the tip, and an elliptical shape at the skirt of the conical shape 63a. Arc positions g1 and g2 on the major axis side of the elliptical seal ring 45 bent at the minor axis portion 47 in the cylinder body 41 are two positions facing the major axis direction (two positions f1 and f2 in FIG. 6). Since the seal ring 45 is pushed in such a manner as to be interrupted, the seal ring 45 in the thin pipe 61 can be moved into the cylinder body 41 without breaking the posture of the seal ring 45 mounted in the thin pipe 61. When the seal ring 45 is pushed by the push rod 63 as it is, a pair of elliptical arcs on the major axis side located at substantially symmetrical positions with respect to the axis of the cylinder body 41 are substantially simultaneously shuffled. To be guided into the seal groove 43 of the inner diameter portion of Ndabodi 41, the restoring force of the seal ring 45 which has flexed into an elliptical, it can be reliably attached to the seal groove 43.

The specific angle of the conical shape of the push rod used in the seal ring mounting method of the present invention is not limited to 120 ° shown in the above embodiment. However, it is desirable to set the obtuse angle in the range of 90 ° to 160 °.
Further, the tip of the push bar in the shape of a cone may not be sharp but may be appropriately rounded.

  In the above embodiment, the case where the workpiece is a cylinder body has been described. However, the present invention is not limited to the cylinder body, and all cases where the seal ring is mounted in a seal groove formed in an annular shape on the inner diameter portion of the cylindrical body. It is applicable to.

It is a longitudinal cross-sectional view of the seal ring used with the installation method of the seal ring which concerns on this invention. It is explanatory drawing of the 1st process of the attachment method of the seal ring which concerns on this invention. It is explanatory drawing of the 2nd process of the attachment method of the seal ring which concerns on this invention. It is a longitudinal cross-sectional view of the state by which the seal ring was inserted in the thin pipe at the 2nd process of the attachment method of the seal ring which concerns on this invention. It is a perspective view of the state shown in FIG. It is explanatory drawing of the 3rd process of the attachment method of the seal ring which concerns on this invention. It is explanatory drawing of the 1st example of the cylinder body to which the attachment method of the seal ring of this invention is applied. It is explanatory drawing of the 2nd example of the cylinder body to which the attachment method of the seal ring of this invention is applied. It is the perspective view which showed the attachment method of the seal ring by the conventional jig | tool. It is the longitudinal cross-sectional view which showed the attachment method of the seal ring by another conventional jig | tool.

Explanation of symbols

41 Cylinder body 43 Seal groove 45 Seal ring 51 Jig 52 Narrow groove 55 Tapered groove 57 Folding bar 58 Tapered hole 61 Thin pipe 63 Extrusion bar 63a Conical shape

Claims (2)

A seal ring mounting method for mounting an annular seal ring in an annular seal groove formed in an inner diameter portion of a work,
The seal ring coated with a lubricant is inserted into a narrow groove that matches the inner diameter of the pipe that can be fitted into the inner diameter portion of the workpiece, and is deformed into an oval shape.
Next, by pressing the short-diameter portion of the elliptical seal ring and pushing the elliptical seal ring into the pipe, the elliptical seal ring is further bent at the short-diameter portion. Housed in,
Next, the pipe is fitted to the workpiece so that the tip of the pipe located on the opposite side to the short diameter portion of the seal ring accommodated stops before the seal groove to be mounted,
Next, the conical tip of the push rod inserted from the base end side of the pipe is inserted into the arcuate portion on the long diameter side of the elliptical seal ring which is bent at the short diameter portion in the pipe. the sealing ring is pushed out into the workpiece, by guiding the substantially the same time the sealing groove the arc portions of the pair of the long diameter side of the seal ring, be fitted to the seal groove by the restoring force of the seal ring A seal ring mounting method characterized by the above.   2. The method of attaching a seal ring according to claim 1, wherein when the seal ring is pushed out from the pipe, a push rod having a conical apex angle formed at a tip thereof is formed as an obtuse angle.

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