JP2007303493A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device 1 capable of preventing rotation of a metallic ring 3 relative to a housing 2, without arranging a collar part in an outer peripheral edge part of the metallic ring 3 reciprocating in the axial direction, in the sealing device 1 formed by arranging a rubber elastic body seal 4 in the metallic ring 3 reciprocating in the axial direction in the housing 2, and arranging a reference projection 3e abutting on the housing 2 by a stroke one end limit in the metallic ring 3. <P>SOLUTION: A recessed part 2a is arranged on a receiving surface of the housing 2 in response to the reference projection 3e. The reference projection 3e is inserted into the recessed part 2a so that a stroke can be freely performed. A rotation preventive mechanism 5 of the metallic ring 3 to the housing 2 is set by engaging the reference projection 3e in the circumferential direction with the recessed part 2a. The height (a) of the reference projection 3e, the depth (b) of the recessed part 2a and the stroke length (h) of the metallic ring 3, are set in the relationship of a>b>h. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used as, for example, a bonded piston seal (BPS) in a vehicle automatic transmission (A / T).

  Conventionally, as shown in FIG. 5, a rubber-made elastic seal 54 is provided on a metal ring 53 that reciprocates in the axial direction (vertical direction in the figure) within a housing 52, and the metal ring 53 has one end of its stroke. There is known a sealing device 51 provided with a reference projection 53a that abuts on the end surface portion 52a of the housing 52 (upper limit in the figure), and this sealing device 51 is used as a bonded piston seal in the automatic transmission.

  The reference protrusion 53a is provided to leave a gap 55 between the metal ring 53 and the end surface portion 52a of the housing 52 when the metal ring 53 reaches one end of its stroke, thereby ensuring an oil flow path. Further, the metal ring 53 is pressed upward in the figure by the return spring 56 when no hydraulic pressure is applied, and stops when the reference protrusion 53 a is brought into contact with the end surface portion 52 a of the housing 52. Therefore, the reference projection 53a has this name because it has a function of defining the stroke end limit of the metal ring 53 in this way.

  When the metal ring 53 is used as the piston seal, the metal ring 53 is used for fastening the clutch 57 inside the mission, and serves to seal oil, maintain hydraulic pressure, and transmit pressure. . Further, the metal ring 53 is rotated with a cylinder and a shaft constituting the housing 52, but may cause relative rotation with the cylinder as the engine rotates. At this time, since the reference protrusion 53a rubs in the circumferential direction with the receiving surface of the cylinder which is the end surface portion 52a, abnormal wear occurs on the reference protrusion 53a and the receiving surface, and the positioning function of the metal ring 53 may be impaired. . There is also a concern that contamination will increase due to wear.

  In order to cope with the above problem, as shown in FIGS. 6 and 7, a locking collar 53 b is provided on the outer peripheral edge of the metal ring 53 to prevent relative rotation, and this collar 53 b is provided on the inner surface of the housing 52. It is conceivable to engage with the groove 52b provided in the. When the inner surface of the housing 52 has a spline shape, the concave portion can be used.

  However, when the rotation preventing flange 53b is provided on the outer peripheral edge of the metal ring 53 as described above, the flange 53b protrudes further outward in the radial direction from the outer peripheral edge of the metal ring 53. For this reason, in the molding process of the metal ring 53, there arises a disadvantage that the flange 53b is damaged due to interference or the handleability of the metal ring 53 is deteriorated.

Japanese Patent Laying-Open No. 2005-249116 (FIG. 2)

  In view of the above, the present invention provides a sealing device that can prevent a metal ring from rotating relative to a housing without providing a flange on the outer peripheral edge of the metal ring that reciprocates in the axial direction. Objective.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention is provided with a rubber-made elastic seal on a metal ring reciprocating in an axial direction in a housing and at the stroke end of the metal ring. In a sealing device provided with a reference protrusion abutting against the housing, a recess is provided on the receiving surface of the housing corresponding to the reference protrusion, the reference protrusion is inserted into the recess in a freely strokeable manner, and the reference protrusion is inserted into the recess. The metal ring is prevented from rotating with respect to the housing by engaging in the circumferential direction.

The sealing device according to claim 2 of the present invention is the sealing device according to claim 1, wherein the height of the reference protrusion is a, the depth of the recess is b, and the stroke length of the metal ring is h.
a>b> h
It has the relationship of these.

  The sealing device according to claim 3 of the present invention is characterized in that in the sealing device according to claim 1 described above, a recess for oil sump is provided on the tip surface of the reference projection.

  Furthermore, a sealing device according to claim 4 of the present invention is the sealing device according to any one of claims 1 to 3, wherein the sealing device is used as a bonded piston seal in an automatic transmission for a vehicle. It is a feature.

  As described above, in the sealing device of the present invention, the metal ring is provided with the reference protrusion, and the reference protrusion protrudes not in the radial direction but in the axial direction in terms of its function, but is combined with this protrusion. If the concave portion is provided on the housing side, this makes it possible to realize a detent structure. From this point of view, in the present invention, a recess is provided on the receiving surface of the housing corresponding to the reference protrusion, the reference protrusion is inserted into the recess in a freely strokeable manner, and the reference protrusion is engaged with the recess in the circumferential direction. Therefore, we decided to set a mechanism to prevent the metal ring from rotating against the housing. The reference protrusion is in contact with the bottom surface of the recess to define the stroke end limit of the metal ring.

  Further, it is preferable that the height of the reference protrusion is set to be larger than the depth of the recess, whereby an oil flow path is provided between the metal ring and the housing with the reference protrusion in contact with the bottom surface of the recess. It can be secured. Further, it is preferable that the depth of the concave portion is set to be larger than the stroke length of the metal ring, thereby preventing the reference protrusion from dropping from the concave portion over the entire stroke of the metal ring. . Furthermore, it is preferable to provide an oil reservoir dent on the tip end surface of the protrusion, whereby the oil stored in the dent exerts the effect of suppressing the wear of the reference protrusion tip surface and the recess bottom surface.

  The present invention has the following effects.

  That is, in the sealing device according to claim 1 of the present invention, as described above, the metal ring rotation preventing structure with respect to the housing is formed by the combination of the reference projection of the metal ring and the corresponding recess provided on the receiving surface of the housing. Therefore, the metal ring can be prevented from rotating with respect to the housing without providing a flange on the outer peripheral edge of the metal ring that reciprocates in the axial direction. The reference protrusion is formed so as to protrude toward one side in the axial direction on the plane of the metal ring, and does not protrude radially outward from the outer peripheral edge of the metal ring. Therefore, as in the case of providing a collar on the outer peripheral edge of the metal ring, it is possible to prevent the collar from being damaged due to interference or the handling of the metal ring from being deteriorated in the metal ring molding process. Can do.

  In addition, the reference protrusion that exhibits the anti-rotation function as described above has been conventionally provided on the metal ring as a protrusion having a function of defining the stroke end limit of the metal ring. It is not newly provided to set (however, height adjustment is necessary). Therefore, although the metal ring has the same structure as the conventional one, it has a function of preventing rotation in addition to the function of defining the stroke end limit, so that the metal ring part can be multifunctionalized.

  In addition to this, in the sealing device according to claim 2 of the present invention, since the height of the reference protrusion is set larger than the depth of the recess, the metal ring and the housing are placed in a state where the reference protrusion is in contact with the bottom of the recess. In addition, the oil flow path can be secured in between, and the depth of the recess is set to be larger than the stroke length of the metal ring, so that the reference projection is not dropped from the recess over the entire stroke of the metal ring. And the anti-rotation function by the reference protrusion and the recess can be maintained.

  Moreover, in the sealing device according to claim 3 of the present invention, since the oil reservoir dent is provided on the tip surface of the reference protrusion, the oil stored in the dent suppresses the occurrence of wear on the reference protrusion tip surface and the recess bottom surface. be able to.

  Furthermore, according to the fourth aspect of the present invention, the effects of the first to third aspects can be obtained for the bonded piston seal in the automatic transmission for a vehicle.

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

  FIG. 1 shows a cross section of the main part of a sealing device 1 according to an embodiment of the present invention, and FIG. 2 shows a plan view of the sealing device 1. 2 shows the metal ring 3 in a plan view and the cylinder 2B of the housing 2 in a sectional view for convenience of drawing. FIG. 3 is an enlarged view of part A of FIG. The sealing device 1 according to the embodiment is used as a bonded piston seal in an automatic transmission for a vehicle, and is configured as follows.

  That is, the sealing device 1 has a rubber ring-like seal 4 attached to a metal ring 3 reciprocating in the axial direction (vertical direction in FIG. 1) in a housing 2 and has a stroke end limit on the metal ring 3. A reference projection 3e that contacts the end surface of the housing 2 is provided at the upper end limit in FIG. 1, and a recess 2a is provided on the receiving surface of the housing 2 corresponding to the reference projection 3e. A rotation prevention mechanism 5 for the metal ring 3 with respect to the housing 2 is set by inserting 3e into the recess 2a in a freely strokeable manner and engaging the reference protrusion 3e with the recess 2a in the circumferential direction.

  The metal ring 3 is formed in an annular shape by sheet metal pressing, and cylindrical portions 3b and 3c are integrally formed on the inner and outer circumferences of the annular flat portion 3a. A reference protrusion 3e is integrally formed on the flat surface portion 3a so as to be located on the inner peripheral side of the step portion 3d. A plurality of reference protrusions 3e are provided at predetermined intervals on the circumference. The cylindrical portion 3c on the outer peripheral side is a pressing portion that presses the multi-plate clutch 6 during operation, and has an outward flange portion 3f at the tip thereof. In the comparative example shown in FIG. 5 and FIG. 6, the flange 53b for preventing rotation is provided on the outer peripheral edge of the flange 3f, but such a flange 53b is not provided at all in this embodiment. . The metal ring 3 is sometimes called a piston or a piston body for an automatic transmission because of its function.

  The housing 2 is composed of a combination of an inner peripheral side shaft 2A and an outer peripheral side cylinder 2B, and a recess 2a is provided on the end surface of the cylinder 2B corresponding to the reference protrusion 3e. As described above, a plurality of the reference protrusions 3e are provided at predetermined intervals on the circumference, and a plurality of the recesses 2a are also provided at predetermined intervals on the circumference.

  As shown in an enlarged view in FIG. 3, the reference protrusion 3e is inserted into the recessed portion 2a so as to be freely strokeable in the axial direction, and is engaged with the recessed portion 2a in the circumferential direction to thereby form a metal with respect to the housing 2. A rotation stop mechanism 5 for the ring 3 is set. The reference protrusion 3e defines the stroke end limit of the metal ring 3 by contacting the bottom surface of the recess 2a.

  The height a of the reference protrusion 3e is set to be greater than the depth b of the recess 2a (a> b). Therefore, the metal ring 3 and the housing 2 are in a state where the reference protrusion 3e is in contact with the bottom surface of the recess 2a. A gap 7 in the axial direction is left between the two and an oil passage is secured. The depth b of the recess 2a is set to be larger than the stroke length (distance) h of the metal ring 3 (b> h), so that the reference protrusion 3e extends from the recess 2a over the entire stroke of the metal ring 3. It is prevented from falling off.

  In the sealing device 1 configured as described above, the reference projection 3e is combined with the recess 2a provided in the housing 2 in addition to the function of defining the stroke end limit of the metal ring 3 by contacting the end surface portion of the housing 2. It has a function of preventing the metal ring 3 from rotating relative to the housing 2 by engaging with 2a in the circumferential direction. The reference projection 3e is formed so as to project toward one side in the axial direction on the plane of the metal ring 3, and does not project radially outward from the outer peripheral edge of the metal ring 3. Accordingly, it is possible to prevent the flange from being damaged due to interference or the handling of the metal ring 3 from being deteriorated in the molding process of the metal ring 3 as in the case where the flange is provided at the outer peripheral edge of the metal ring 3. be able to.

  Further, since the height a of the reference protrusion 3e is set to be greater than the depth b of the recess 2a, the reference ring 3e is in contact with the bottom surface of the recess 2a, so that the metal ring 3 and the housing 2 A gap 7 is set between them, and an oil flow path is secured. Therefore, smooth operation of the device can be ensured.

  Further, since the depth b of the recess 2a is set to be greater than the stroke length h of the metal ring 3, the reference projection 3e does not fall out of the recess 2a over the entire stroke of the metal ring 3. . Therefore, the anti-rotation function by the reference protrusion 3e and the recess 2a can be maintained over the entire stroke of the metal ring 3.

  In the above embodiment, the tip surface of the reference projection 3e is formed in a flat shape. However, the tip surface of the projection 3e may be provided with a recess 3g as shown in FIG. When the recess 3g is provided at the tip of 3e, the oil stored in the recess 3g exerts an effect of suppressing wear on the tip surface of the reference projection 3e and the bottom surface of the recess 2a. Further, it is possible to expect a buffering action at the moment when the tip surface of the reference protrusion 3e comes into contact with the bottom surface of the recess 2a by the oil stored in the recess 3g. The recess 3g is usually provided at one location on one projection 3e, but a plurality of smaller ones may be provided. Further, a rubber film may be attached to the tip surface of the reference protrusion 3e in order to ensure a buffering action.

Sectional drawing of the principal part of the sealing device which concerns on the Example of this invention. Top view of the sealing device Part A enlarged view of FIG. Sectional drawing which shows the other example of a shape of a reference | standard protrusion Sectional drawing of the sealing device which concerns on a prior art example Sectional drawing of the principal part of the sealing device which concerns on a comparative example Top view of the sealing device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Housing 2A Shaft 2B Cylinder 2a Recessed part 3 Metal ring 3a Plane part 3b, 3c Cylindrical part 3d Step part 3e Reference protrusion 3f Flange part 3g Depression 4 Seal 5 Non-rotating mechanism 6 Multi-plate clutch 7 Gap

Claims (4)

A rubber ring-like seal (4) is provided on the metal ring (3) reciprocating in the axial direction within the housing (2), and the metal ring (3) contacts the housing (2) at one end of the stroke. In the sealing device (1) provided with the reference protrusion (3e) in contact,
A recess (2a) is provided on the receiving surface of the housing (2) corresponding to the reference protrusion (3e), the reference protrusion (3e) is inserted into the recess (2a) in a freely strokeable manner, and the reference protrusion (3e) ) In the circumferential direction with respect to the recess (2a) to set a detent mechanism (5) for the metal ring (3) with respect to the housing (2). The sealing device according to claim 1.
The height of the reference protrusion (3e) is a, the depth of the recess (2a) is b, and the stroke length of the metal ring (3) is h.
a>b> h
A sealing device characterized by having the following relationship: The sealing device according to claim 1.
A sealing device, wherein a recess (3g) for oil sump is provided on the tip surface of the reference projection (3e). The sealing device according to any one of claims 1 to 3,
The sealing device (1) is used as a bonded piston seal in an automatic transmission for a vehicle.

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