JP2017067284A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which seals a gap between a rotor of a torsional damper mounted on a rotational shaft and a non-rotation stationary body of an engine case provided together with the rotor, which includes a magnetic encoder configured to measure rotation of the rotational shaft, and which can be easily manufactured.SOLUTION: A sealing device includes a metal ring 11 bridging and bonding a magnetic encoder 21 and attached to a rotor 52, and a seal structure 31 with the metal ring. The seal structure is a rotary vane structure including a rotary vane part 33. The metal ring integrally includes a fitting cylindrical part 11a attached to the rotor, and a seal formation part 11c forming the seal structure, and on an outer peripheral surface of the fitting cylindrical part, the magnetic encoder is bridged and bonded.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used, for example, in the field related to automobiles.

  Conventionally, as a technique for sensing the rotation speed and rotation angle of a crankshaft of an automobile engine, a magnetic encoder 61 is installed on a hub 52 of a torsional damper 51 as shown in FIG. A cross-linked adhesive has been developed (see Patent Document 1).

  The torsional damper 51 is obtained by connecting an inertial mass body (damper mass) 54 to a hub 52 fixed to a crankshaft (not shown) via a rubber-like elastic body (damper spring) 53, and by its resonance operation. Absorbs and attenuates torsional vibrations generated in the crankshaft.

  The magnetic encoder 61 is formed in a ring shape by a predetermined rubber-like elastic material mixed with magnetic powder, and has a number of N poles and S poles alternately arranged at a predetermined pitch on the circumference as a circumferential magnetization pattern. In combination with the magnetic sensor 71 (FIG. 10), the rotational speed and rotational angle of the crankshaft are sensed.

  In the technique of FIG. 9 described above, the magnetic encoder 61 that exhibits a sensing function is also configured to exhibit a sealing function. That is, as shown in FIG. 10, the magnetic encoder 61 is disposed close to the engine case 81 to form a minute gap c between the magnetic encoder 61 and the engine case 81, thereby forming a non-contact type labyrinth seal 91. Thus, a seal structure is set for sealing so that external foreign matters such as dust and muddy water do not enter the engine.

  In recent years, in order to reduce the weight of the torsional damper 51, as shown in FIG. 11, a window portion 55 is provided in the hub 52 (see Patent Document 2).

JP 2011-241907 A JP 2014-206247 A

  However, when the window portion 55 shown in FIG. 11 is provided in the hub 52 of the torsional damper 51 shown in FIGS. 9 and 10, there is a concern that external foreign matters such as dust and muddy water may easily enter from the window portion 55. Is done. Therefore, in order to cope with this, further improvement in sealing performance is required.

  In the techniques shown in FIGS. 9 and 10, since the magnetic encoder 61 is cross-linked and bonded directly to the hub 52, a large cross-linking mold corresponding to the size of the hub 52 must be prepared in manufacturing the magnetic encoder 61. It takes time and effort to manufacture. Therefore, a structure that is easy to manufacture is required.

  In view of the above, the present invention is a sealing device that seals between a rotating body such as a torsional damper attached to a rotating shaft and a non-rotating stationary body such as an engine case attached to the rotating body, An object of the present invention is to provide a sealing device including a magnetic encoder for measuring the rotation of a rotating shaft, and capable of facilitating the manufacture thereof.

The present invention employs the following means in order to achieve the above object.
The sealing device of the present invention is a sealing device that seals between a rotating body mounted on a rotating shaft and a non-rotating stationary body that is attached to the rotating body, and bridges a magnetic encoder that measures the rotation of the rotating shaft. A seal structure is provided with a metal ring that is bonded and attached to the rotating body, and the seal structure is a rotating blade structure including a rotating blade portion (Claim 1).

  The sealing device of the present invention having the above configuration includes a metal ring attached to a rotating body, and a magnetic encoder is bridged and bonded to the metal ring, and a rotating blade structure including a rotating blade portion is set as a seal structure by the metal ring. To do. Therefore, the counterpart component that cross-links and bonds the magnetic encoder is not a large component such as a hub of a torsional damper, but a relatively small metal ring attached to the hub, so it is necessary to prepare a large cross-linking mold. This makes it possible to facilitate the manufacture. As the shape of the metal ring, for example, a mounting cylinder part attached to the rotating body and a seal forming part forming a seal structure are integrally provided, and a magnetic encoder is cross-linked and bonded to the outer peripheral surface of the mounting cylinder part.

The seal structure is preferably as follows.
(1) A rotating blade part is provided on the outer peripheral side of the seal forming part in the metal ring.
(2) A rotating blade part is provided on the stationary body side of the seal forming part in the metal ring.
(3) A rubber molded product held by the seal forming portion in the metal ring is provided, and the rotating blade portion is provided by the rubber molded product.

  Further, as described above, the sealing device of the present invention is used, for example, in the field of automobiles. In this case, the rotating shaft is the rotating shaft of the engine, and the rotating body is a torsional damper mounted on the rotating shaft. The stationary body is an engine case. Therefore, it is possible to facilitate the manufacture of the sealing device used for such applications in the surrounding environment.

  According to the present invention, since the magnetic encoder for measuring the rotation of the rotating shaft is bridge-bonded and has the seal structure with the metal ring attached to the rotating body, the manufacturing of the sealing device can be facilitated. Moreover, since the rotary blade structure including the rotary blade portion is set as the seal structure using the metal ring, a sufficient sealing effect can be exerted against a sealing target such as an external foreign object.

Sectional drawing of the principal part of the sealing device which concerns on 1st Example of this invention. The perspective view of the rotary blade part with which the sealing device is equipped Sectional drawing of the principal part of the sealing device which concerns on 2nd Example of this invention. The perspective view of the rotary blade part with which the sealing device is equipped Cross-sectional view of the main part showing another example of the rotating blade part Sectional drawing of the principal part of the sealing device which concerns on 3rd Example of this invention. The perspective view of the rotary blade part with which the sealing device is equipped Cross-sectional view of the main part showing another example of the rotating blade part Sectional drawing of the principal part of the sealing device which concerns on a prior art example Cross-sectional view of the relevant part showing the mounting state of the sealing device Sectional drawing of the principal part of the sealing device which concerns on another prior art example

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
As shown in FIG. 1, the sealing device 1 includes a torsional damper hub (rotary body) 52 mounted on a crankshaft (rotating shaft, not shown) of a vehicle engine, and an engine arranged side by side with the hub 52. A metal ring 11 attached to the hub 52 is provided to seal the external foreign matter such as dust and muddy water from entering the engine inside I with the case (non-rotating stationary body) 81. The magnetic encoder 21 is bonded to the metal ring 11 by cross-linking, and the seal structure 31 by the metal ring 11 is set.

  The hub 52 is integrally provided with a boss portion 52a and a flange portion 52b, and a step-like attachment portion 52c to which the metal ring 11 can be attached is provided on one surface in the axial direction (case 81 side) of the flange portion 52b. . An oil seal 82 is attached to the inner peripheral surface of the engine case 81 so that the oil inside the engine I does not leak to the outside, and the seal lip 82a is slidably in contact with the outer peripheral surface of the boss portion 52a.

  The metal ring 11 includes a mounting cylinder portion 11a fitted to the outer peripheral surface of the mounting portion 52c of the hub 52, and an end surface portion extending radially inward from one axial end portion of the mounting cylinder portion 11a. 11b is integrally formed, and a seal forming portion 11c for forming the seal structure 31 is formed integrally from the inner peripheral end portion of the end surface portion 11b toward one side in the axial direction.

  The magnetic encoder 21 is formed in an annular shape and is bonded to the outer peripheral surface of the mounting cylinder portion 11 a of the metal ring 11 by cross-linking. The magnetic encoder 21 is formed in a ring shape by a predetermined rubber-like elastic material mixed with magnetic powder, and has a number of N poles and S poles alternately arranged at a predetermined pitch on the circumference as a circumferential magnetization pattern. In combination with a magnetic sensor (not shown), the rotational speed and rotational angle of the crankshaft are sensed.

  The seal forming portion 11c in the metal ring 11 is formed in a cylindrical shape. The cylindrical seal-forming portion 11c extends toward the case 81 and is disposed close to the case 81 to form a minute gap c between the case 81 and the metal ring 11 and the case 81. A non-contact type labyrinth seal 32 is formed.

  Further, in this embodiment, as shown in FIG. 2 in particular, on the outer peripheral side of the seal forming portion 11c, external foreign matters such as dust and muddy water to be sealed by wind force (aerodynamics) generated during rotation are directed outward in the radial direction. A rotary blade structure including a rotary blade portion 33 to be scattered is provided.

  The rotating blade part 33 is provided with a plurality of (eight in the figure) blades (blade-like protrusions) 33a on the circumference in a uniform manner, and each of the blades 33a is directed radially outward from the outer peripheral surface of the seal forming part 11c. Is provided. The blades 33a are formed of a predetermined rubber-like elastic body and bonded to the outer peripheral surface of the seal forming portion 11c. However, the material may be other materials such as metal.

  In the sealing device 1 having the above-described configuration, the magnetic encoder 21 is bridge-bonded and a seal structure 31 by the metal ring 11 attached to the hub 52 is provided. Specifically, a non-contact type is provided between the metal ring 11 and the case 81. The labyrinth seal 32 is provided and the rotating blade structure including the rotating blade portion 33 is provided on the metal ring 11. Therefore, it is possible to seal the foreign matter such as dust and muddy water from entering the engine interior I. it can. Further, since the magnetic encoder 21 is provided, it is possible to sense the number of rotations and the rotation angle of the crankshaft.

  Further, since the magnetic encoder 21 is cross-linked and bonded to the metal ring 11 attached to the hub 52, it is necessary to prepare a large-sized cross-linking mold as compared with the case where the magnetic encoder 21 is directly bonded to the hub 52 by cross-linking. Manufacturing can be facilitated, for example.

Second embodiment ...
In the metal ring 11 in the first embodiment shown in FIGS. 1 and 2, the blades 33a of the rotary blade portion 33 are formed separately from the cylindrical seal forming portion 11c and then attached to the seal forming portion 11c. However, since the metal ring 11 is often manufactured by a sheet metal pressing method, it is conceivable that the blades 33a are integrally formed during the pressing process. In this case, as shown in FIG. 3 and FIG. 4, the blade 33a is formed by cutting into the cylindrical seal forming portion 11c and rising from the seal forming portion 11c. A recess 33b is provided adjacent to the blade 33a as a processing mark after the raising. According to this embodiment, the blades 33a can be integrally formed at the time of press working, so that the metal ring 11 including the rotating blade portion 33 can be manufactured easily and at low cost. Other configurations of the sealing device 1 shown in FIGS. 3 and 4 are the same as those of the first embodiment.

  Further, a rubber molded product held by the seal forming portion 11c in the metal ring 11 may be provided, and the rotary blade portion 33 may be formed by this rubber molded product. In this case, the rubber molded product has an annular mounting portion. And a plurality of circumferentially provided blades.

  As an example of providing such a rubber molded product, in the example shown in FIG. 5A, the rubber molded product 34 is held on the outer peripheral side of the seal forming portion 11c in the metal ring 11 by means such as fitting, bonding or integral molding. The rubber molded product 34 is integrally provided with an annular (tubular) attachment portion 34a and a plurality of circumferentially provided blades 34b provided on the outer peripheral side of the attachment portion 34a. .

  The cross-sectional shape of the annular mounting portion 34a may be an L-shaped cross section formed by a combination of a cylindrical portion 34c and an end surface portion 34d as shown in FIG. 5B. In this case, the mounting portion 34a is a deformation of the blade 34b. It is possible to increase the blade holding force for suppressing the above. Further, as shown in FIG. 5C, a hook-shaped engagement portion 34e may be provided at one end of the attachment portion 34a, and the engagement portion 34e may be inserted into one end of the seal forming portion 11c. Rubber has the advantage of being lighter and easier to handle than metal.

Third embodiment ...
As shown in FIG. 6, the sealing device 1 includes a torsional damper hub (rotary body) 52 mounted on a crankshaft (rotating shaft, not shown) of a vehicle engine and an engine arranged side by side with the hub 52. A metal ring 11 attached to the hub 52 is provided to seal the external foreign matter such as dust and muddy water from entering the engine inside I with the case (non-rotating stationary body) 81. The magnetic encoder 21 is bonded to the metal ring 11 by cross-linking, and the seal structure 31 by the metal ring 11 is set.

  The hub 52 is integrally provided with a boss portion 52a and a flange portion 52b, and a step-like attachment portion 52c to which the metal ring 11 can be attached is provided on one surface in the axial direction (case 81 side) of the flange portion 52b. . An oil seal 82 is attached to the inner peripheral surface of the engine case 81 so that the oil inside the engine I does not leak to the outside, and the seal lip 82a is slidably in contact with the outer peripheral surface of the boss portion 52a.

  The metal ring 11 includes a mounting cylinder portion 11a fitted to the outer peripheral surface of the mounting portion 52c of the hub 52, and an end surface portion extending radially inward from one axial end portion of the mounting cylinder portion 11a. 11b is integrally formed, and a seal forming portion 11c for forming the seal structure 31 is formed integrally from the inner peripheral end portion of the end surface portion 11b toward one side in the axial direction.

  The magnetic encoder 21 is formed in an annular shape and is bonded to the outer peripheral surface of the mounting cylinder portion 11 a of the metal ring 11 by cross-linking. The magnetic encoder 21 is formed in a ring shape by a predetermined rubber-like elastic material mixed with magnetic powder, and has a number of N poles and S poles alternately arranged at a predetermined pitch on the circumference as a circumferential magnetization pattern. In combination with a magnetic sensor (not shown), the rotational speed and rotational angle of the crankshaft are sensed.

  The seal forming portion 11c in the metal ring 11 is integrally formed from a cylindrical portion 11f continuous from the inner peripheral end portion of the end surface portion 11b and from one axial end portion of the cylindrical portion 11f toward the radially inward direction. As shown in FIG. 7 on the side of the engine case 81 of the flange portion 11g, dust or mud water that is to be sealed with wind power (aerodynamics) generated during rotation is formed as a seal structure 31. A rotary blade structure is provided that includes a rotary blade portion 33 that scatters external foreign matters such as the like toward the outside in the radial direction.

  The rotating blade portion 33 is provided with a plurality of (eight in the figure) blades (blade-like protrusions) 33a on the circumference in a uniform manner, and the blades 33a are respectively provided from the flange portion 11g toward one axial direction, that is, toward the engine case 81. It has been. The blades 33 a are not in contact with the engine case 81, and set a minute gap c between the blade 33 a and the engine case 81. Since the blade 33a is formed by cutting the flange portion 11g and rising from the seal forming portion 11c, the seal forming portion 11c is provided with a recess 33b adjacent to the blade 33a as a processing mark after the blade 33a is started up. ing.

  In the sealing device 1 having the above-described configuration, the magnetic encoder 21 is bridged and bonded, and the seal structure 31 is provided by the metal ring 11 attached to the hub 52. Specifically, the metal ring 11 includes the rotating blade portion 33. Since the blade structure is provided, it can be sealed so that external foreign matters such as dust and muddy water do not enter the engine interior I. Further, since the magnetic encoder 21 is provided, it is possible to sense the number of rotations and the rotation angle of the crankshaft.

  Further, since the magnetic encoder 21 is cross-linked and bonded to the metal ring 11 attached to the hub 52, it is necessary to prepare a large-sized cross-linking mold as compared with the case where the magnetic encoder 21 is directly bonded to the hub 52 by cross-linking. Manufacturing can be facilitated, for example.

  Moreover, since the hollow is not provided in the cylindrical part 11f of the seal formation part 11c in the metal ring 11, it is difficult for dust to enter the engine.

  About the said rotary blade part 33, the rubber molded product hold | maintained by the seal formation part 11c in the metal ring 11 may be provided, and you may make it form the rotary blade part 33 with this rubber molded product, In this case, a rubber molded product Is integrally provided with an annular mounting portion and a plurality of circumferential blades.

  As an example of providing such a rubber molded product, in the example shown in FIG. 8A, the rubber molded product is provided on one end surface in the axial direction of the flange portion 11g in the seal forming portion 11c of the metal ring 11, that is, on the end surface on the engine case 81 side. 34 is held by means such as adhesion or integral molding, and the rubber molded product 34 is provided on the annular mounting portion 34a and one end surface in the axial direction of the mounting portion 34a, that is, the end surface on the engine case 81 side. A plurality of blades 34b on the circumference are integrally provided.

  As shown in FIG. 8B, the cross-sectional shape of the annular mounting portion 34a may be an L-shaped cross section composed of a combination of the end face portion 34d and the cylindrical portion 34c. In this case, the annular mounting portion 34a is formed on the inner peripheral side of the flange portion 11g. The rubber molded product 34 can be attached to the flange portion 11g by inserting (fitting) the cylindrical portion 34c. Further, as shown in FIG. 8C, a hook-like engagement portion 34e is provided at the inner peripheral end portion of the attachment portion 34a, and the engagement portion 34e is engaged with the inner peripheral end portion of the flange portion 11g. It is also conceivable to prevent the rubber molded product 34 from coming off from the flange portion 11g. Rubber has the advantage of being lighter and easier to handle than metal.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Metal ring 11a Mounting cylinder part 11b, 34d End surface part 11c Seal formation part 11f Cylindrical part 11g, 52b Flange part 21 Magnetic encoder 31 Seal structure 32 Labyrinth seal 33 Rotary blade part 33a, 34b Blade 33b Recess 34 Rubber Molded product 34a Mounting portion 34c Tube portion 34e Engaging portion 52 Hub (rotating body)
52a Boss part 52c Attachment part 81 Engine case (non-rotating stationary body)
82 Oil seal c Minute gap

Claims (5)

A sealing device that seals between a rotating body attached to a rotating shaft and a non-rotating stationary body provided alongside the rotating body,
A magnetic encoder that measures the rotation of the rotating shaft is cross-bonded and has a seal structure with a metal ring attached to the rotating body,
The sealing device is a rotary blade structure including a rotary blade portion. The sealing device according to claim 1.
The metal ring is integrally provided with a mounting cylinder portion attached to the rotating body and a seal forming portion forming the seal structure,
A sealing device, wherein the magnetic encoder is cross-linked and bonded to an outer peripheral surface of the mounting cylinder portion. The sealing device according to claim 2.
The sealing device according to claim 1, wherein the rotating blade portion is provided on an outer peripheral side or stationary body side of the seal forming portion in the metal ring. The sealing device according to claim 2.
A rubber molded product held by the seal forming portion in the metal ring;
The sealing device, wherein the rotating blade portion is provided by the rubber molded product. The sealing device according to any one of claims 1 to 4,
The rotating shaft is a rotating shaft of a vehicle engine, the rotating body is a hub of a torsional damper attached to the rotating shaft of the vehicle engine, and the stationary body is an engine case. Sealing device.

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