JP5757091B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device, and more particularly to a sealing device provided in an internal mechanism of an automatic transmission for a vehicle such as an automobile.

Conventionally, a sealing device shown in FIG. 5 is known.
In an automatic transmission of a vehicle such as an automobile, a hydraulically operated piston mechanism is provided to switch on / off of the clutch so as to turn on / off the transmission of rotational torque. A canceller 500 is provided to cancel the centrifugal oil pressure acting on the 200.

That is, this type of sealing device is disposed in the housing case 100 so as to be able to reciprocate, and includes a piston seal 220 that slides and seals with the inner peripheral surface 110 of the housing case 100. A piston 200, a clutch 300 operated by the piston 200, and a canceller seal 520 that seals and slides with the inner peripheral surface 210 of the piston 200, and forms a centrifugal canceller chamber 510 together with the piston 200, , A spring 600 disposed between the piston 200 and the centrifugal canceller 500, and a mating member 700 on the opposite side of the centrifugal canceller chamber 510 from the centrifugal canceller chamber 510. Between the mating member 700 and the centrifugal canceller 500, The outer peripheral side base 810 is the counterpart member 7. Is held at 0 side, it extends radially inward from the outer peripheral side base 810 has a structure that includes a resin material-made ring 800 with an annular plate 820 which is in contact with the plane of the centrifugal canceller 500.
Further, the mating member 700 here is a pinion shaft or a carrier of a planetary gear mechanism.

In this type of sealing device, when the piston 200 rotates, the centrifugal canceller 500 and the resin ring 800 rotate in the same direction, but inevitably rotate between the centrifugal canceller 500 and the resin ring 800. There is a difference.
And although oil exists in the inner peripheral surface side of the resin material ring 800, it was in a poor lubrication state in which oil does not intervene on the contact surface between the resin material ring 800 and the centrifugal canceller 500.

  As a result, frictional force or sliding heat causes wear or dissolution on the contact surface of the resin material ring 800 with the centrifugal canceller 500, causing a problem that the resin material ring 800 is worn and damaged early.

JP 2010-180972 A JP 2003-278798 A

  Therefore, in view of the above-mentioned situation, the resin ring is inevitably worn and damaged early in the rotational operation of the piston even in a state where a rotational difference is inevitably generated between the centrifugal canceller and the resin ring. It aims at providing the sealing device which does not have.

In order to achieve the above object, the present invention includes a piston seal that is reciprocally disposed in a housing case and that slides on and seals with an inner peripheral surface of the housing case, and forms a pressure chamber together with the housing case. A centrifugal canceller comprising a piston operated by the piston, a canceller seal sealingly sliding with a cylindrical inner peripheral surface of the piston, and forming a centrifugal canceller chamber together with the piston, and the piston And a spring disposed between the centrifugal canceller and a counterpart member on the opposite side to the centrifugal canceller chamber of the centrifugal canceller, and an outer peripheral side base portion between the counterpart member and the centrifugal canceller. It is held on the counterpart member side, extends radially inward from the outer peripheral side base, and comes into contact with the plane of the centrifugal canceller The sealing device that includes a resin-made ring with that annular plate,
The annular plate is provided with fluid supply means for supplying a fluid to a joint surface between the annular plate and the centrifugal canceller.

The present invention has the following effects.
According to the sealing device of the first aspect of the present invention, even when the rotational operation of the piston inevitably causes a rotational difference between the centrifugal canceller and the resin material ring, the resin material ring is quickly damaged by wear. The oil can be reliably supplied between the centrifugal canceller and the resin ring.

Furthermore, according to the sealing device of the second aspect of the present invention, the oil can be easily introduced between the centrifugal canceller and the resin ring, and the oil can be widely supplied due to the wedge effect.

The longitudinal cross-sectional view of the sealing device which concerns on a reference form . The expanded sectional view of the resin-made ring of FIG. The top view of the resin-made ring of FIG. The figure which showed the aspect of the resin-made rings which concern on this invention similarly to FIG. The longitudinal cross-sectional view of the sealing device which concerns on a prior art.

Hereinafter, the best mode for carrying out the present invention will be described.
A reference embodiment will be described with reference to FIGS.

The sealing device according to the reference embodiment is disposed in the housing case 1 so as to be capable of reciprocating, and includes a piston seal 22 that slides in a sealed manner with the inner peripheral surface 11 of the housing case 1. A centrifugal canceller 5 which includes a piston 2 which is actuated by the piston 2, a canceller seal 52 which slides in sliding contact with the inner peripheral surface 21 of the piston 2 and forms a centrifugal canceller chamber 51 together with the piston 2, , There is a spring 6 disposed between the piston 2 and the centrifugal canceller 5, and a counterpart member 7 exists on the opposite side of the centrifugal canceller 5 from the centrifugal canceller chamber 51, and between the counterpart member 7 and the centrifugal canceller 5, The outer peripheral side base 81 is held on the counterpart member 7 side, extends radially inward from the outer peripheral side base 81, and comes into contact with the plane of the centrifugal canceller 5. That has a configuration in which an annular plate 82 resin made ring 8 provided with.

The annular plate 82 is formed with fluid supply means 9 for supplying a fluid to the joint surface between the annular plate 82 and the centrifugal canceller 5.
As shown in FIGS. 2 and 3, the fluid supply means 9 has a groove 91 extending on the surface of the annular plate 82 on the centrifugal canceller 5 side from the inner peripheral end side to the outer side in the radial direction and closed at the tip. Are provided in a plurality of radial shapes.
And this groove | channel 91 becomes thin, so that it goes to radial direction outer side, and it is designed so that the cross-sectional area may become small.
The radial length of the groove 91 is slightly shorter than the radial length of the annular plate 82. For this reason, the radially outer end of the groove 91 is in a closed state.

  By adopting such a mode, even when the rotational movement of the piston 2 inevitably causes a rotational difference between the centrifugal canceller 5 and the resin material ring 8, the resin material ring 8 is quickly damaged by wear. Can be avoided.

  Further, the resin material ring 8 includes an opposing annular plate 83 facing the annular plate 82 substantially in parallel, and the annular plate 82 and the opposing annular plate 83 form an annular space 84.

Further, the resin material ring 8 is provided with an engaging protrusion 85 that engages with the counterpart member 7 side.
For this reason, the resin-made ring 8 can be easily held on the counterpart member 7 side.
The mating member 7 is a pinion shaft or a carrier of a planetary gear mechanism.

Next, an embodiment of the resin material ring 8 according to the present invention will be described with reference to FIG.
That is, the fluid supply means 9 is a through hole 92 provided on the circumference of the annular plate 82.
The through hole 92 is designed to be narrowed from the counterpart member 7 side toward the centrifugal canceller 5 side.

This facilitates the inflow of oil between the centrifugal canceller and the resin material ring, and can supply oil widely due to the wedge effect.
Furthermore, by setting it as such an aspect, oil can be reliably supplied between the centrifugal canceller 5 and the resin material ring 8 by the centrifugal force which acts on the oil confined in the resin material ring 8.

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

  It is suitably used for a sealing device provided in an internal mechanism of an automatic transmission for a vehicle such as an automobile.

DESCRIPTION OF SYMBOLS 1 Housing case 2 Piston 3 Clutch 5 Centrifugal canceller 6 Spring 7 Counterpart member 8 Plastic material ring 9 Fluid supply means 81 Outer peripheral side base 82 Annular plate 83 Opposing annular plate 84 Annular space 91 Groove 92 Through-hole

Claims (2)

The housing case (1) includes a piston seal (22) that is disposed so as to reciprocate and slides in a sealed manner with the inner peripheral surface (11) of the housing case (1). 21), a piston (2) that is actuated by the piston (2), and a canceller seal that slides tightly on the cylindrical inner peripheral surface (21) of the piston (2). 52), a centrifugal canceller (5) that forms a centrifugal canceller chamber (51) with the piston (2), and a spring (between the piston (2) and the centrifugal canceller (5)) 6) and a counterpart member (7) on the opposite side of the centrifugal canceller chamber (51) of the centrifugal canceller (5), and between the counterpart member (7) and the centrifugal canceller (5), So An outer peripheral base (81) is held on the counterpart member (7) side, extends radially inward from the outer peripheral base (81), and is in contact with the plane of the centrifugal canceller (5) (82) ) And a resin ring (8) that forms an annular space (84) by an opposed annular plate (83) facing the annular plate (82) substantially in parallel with the annular plate (82). Fluid supply for supplying fluid to the joint surface between the annular plate (82) and the centrifugal canceller (5) through a through hole (92) provided on the circumference of the annular plate (82). A sealing device provided with means (9). The sealing device according to claim 1, wherein the through hole (92) is designed to be narrowed from the counterpart member (7) side toward the centrifugal canceller (5) side .

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