JP4042473B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device used in, for example, an automatic transmission for automobiles, and the like, and is a sealing device used to prevent damage due to centrifugal hydraulic pressure acting on a hydraulic piston of an automatic transmission.
[0002]
[Prior art]
As automatic transmissions used in automobiles and the like, CVT (Continuously Variable Transmission) and the like are widely known in which a multi-plate clutch is connected by a pressing force of a piston that moves by receiving hydraulic pressure to perform shift control.
[0003]
A schematic configuration of the CVT shift switching unit is shown in FIG. 6 and will be briefly described. FIG. 6 illustrates a cross-sectional configuration of only one side of the rotating shaft in accordance with the conventional practice (the opposite side has the same symmetrical structure).
[0004]
In FIG. 6, an annular piston chamber 11 is formed by the outer peripheral surface of the shaft 10 which is a rotating shaft and a housing provided with a multi-plate clutch on the inner side (not shown).
[0005]
In the piston chamber 11, a bottomed cylindrical piston member (not shown) is disposed so as to be capable of stroke in the axial direction above a bonded canceller seal (BCS, also referred to as a cancel plate) 1 as a sealing device.
[0006]
A bonded canceller seal 1 whose axial movement is restricted is attached to the outer periphery of the shaft 10.
[0007]
On the surface (the lower surface in FIG. 6) opposite to the piston chamber 11 of the bondet canceller seal 1, a protrusion 2 is provided closer to the inner peripheral side.
[0008]
A snap ring 12 serving as a locking member is disposed on the inner peripheral side of the protrusion 2 so as to be attached to the shaft 10, and the snap ring 12 locks the protrusion 2 of the bondet canceller seal 1 to bond the canceller. The movement of the seal 1 in the axial direction is restricted and the eccentricity is prevented.
[0009]
Further, a seal lip 3 as a seal portion is provided at the outer peripheral end of the bondet canceller seal 1, and the seal lip 3 is an outer peripheral side cylindrical portion of a bondet piston seal (BPS) disposed on the piston chamber 11 side. Sealing contact with the inner peripheral surface.
[0010]
A plurality of coil springs 13 for urging the bondet piston seal in the direction away from the bondet canceller seal 1 are arranged in the circumferential direction on the piston chamber 11 side of the bondet canceller seal 1. Yes.
[0011]
In the above configuration, when the oil pressure acts on the pressure chamber provided on the opposite side of the bondet canceller seal 1 (upper side in FIG. 6) of the bondet piston seal and the pressure rises, the bondet piston seal is attached to the coil spring 13. Stroke toward the bondet canceller seal 1 against the force, and press the multi-plate clutch at the end of the outer cylindrical portion of the bondet piston seal (the end extending downward in FIG. 6) to connect the power. Do.
[0012]
When releasing the transmission of power by the multi-plate clutch, the pressure in the pressure chamber is lowered and oil is supplied to the oil chamber between the bondet piston seal and the bondet canceller seal 1 to thereby reduce the coil. The bondet piston seal is stroked to the opposite side of the bondet canceller seal 1 by the urging force of the spring 13.
[0013]
Thus, the bondet piston seal and the bondet canceller seal 1 rotate and move in the axial direction under the hydraulic pressure, and the seal lip 3 and the like function as a seal member formed integrally with the base material. .
[0014]
[Problems to be solved by the invention]
In the bonded canceller seal 1 having such a configuration, the region K in FIG. 6 is viewed from the direction of the arrow (that is, the bottom surface of the bonded canceller seal 1 in FIG. 6 is shown). It is assumed that the shape of the projections 2 to be latched is four, which is chamfered with the inner corner 2a contacting the snap ring 12 being rounded, and the outer corner 2c is left with a corner. It was.
[0015]
In the shape of the protrusion 2 shown in FIG. 7, when the bondet canceller seal 1 receives pressure (centrifugal oil pressure), stress concentration occurs in the corner 2c on the outer peripheral side of the protrusion 2, and the bondet canceller seal 1 Was a cause of damage.
[0016]
Further, as shown in FIG. 8A when the region K in FIG. 6 is viewed from the direction of the arrow (that is, the bottom surface of the bondet canceller seal 1 in FIG. 6), the bondet canceller seal 1 is pressurized (centrifugal oil pressure). As a result, stress concentration occurs in a region indicated by O in the vicinity of the protrusion 2, which causes damage to the bondet canceller seal 1. As shown in FIG. 8 (b) showing a CC cross section of FIG. 8 (a), in this conventional technique, the outer peripheral part of the protrusion 2 and the rising part of the peripheral part in the radial direction become the vertical surface 23 rising vertically. It was.
[0017]
The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a sealing device excellent in pressure resistance that prevents damage due to pressure.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a cylindrical portion extending in the axial direction and an outer peripheral end seal portion which is provided outward from one end portion of the cylindrical portion and is in sliding contact. And an outward flange portion and a projection provided inward from the other end portion of the cylindrical portion and abutting on the outer peripheral surface of the snap ring attached to the inner peripheral shaft on the other axial surface In the sealing device including the inward flange portion, the inner peripheral side surface of the projection is a vertical surface that is vertically raised at the center, and toward the both ends, the axial direction other side of the inward flange portion wherein the edge of the boundary between the surface has an inclined surface which rises gradually from the edge so as to increase in accordance with both smoothness when Ru extends along the outer peripheral surface of said snap ring is toward both ends from the center .
[0026]
Therefore, only the center of the inner periphery of the protrusion is in contact with the locking member, and the center of the inner periphery of the protrusion secures the retaining property with the locking member, and the stress concentrates even when the sealing device receives pressure. Both ends of the inner circumference of the inner wall rise gently and relax the stress, making it difficult for the stress to become excessive, preventing the sealing device from being damaged, and having excellent pressure resistance.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0030]
(First Reference Example ) A reference example will be described with reference to FIGS. 1A and 1B are a plan view and a cross-sectional view showing a protrusion of a bondet canceller seal according to a first reference example . FIG. 1A is a view of a region K in FIG. It is. FIG. 6 is a half cross-sectional view showing a schematic configuration of a shift switching unit fitted with a bondet canceller seal.
[0031]
A bondet canceller seal (BCS, also referred to as a cancel plate) 1 as a sealing device in FIG. 1 is used for a gear changeover unit such as a CVT equipped with the bondet canceller seal 1 shown in FIG. It is. Since the entire configuration of the shift switching unit has been described in the prior art, the description thereof is omitted here.
[0032]
As shown in FIG. 6, the bondet canceller seal 1 is a disk-shaped member formed by pressing a plate material made of a metal material by pressing or the like, and roughly has a cylindrical portion 1 a extending in the axial direction and the cylindrical portion 1 a. An outward flange portion 1b that spreads outward from the end on the piston member side and an inward flange portion 1c that is provided inward from the other end of the tubular portion 1a are integrally formed.
[0033]
The upper surface (the surface on the piston chamber side) of the inward flange portion 1c is a flat surface that is substantially perpendicular to the shaft, and a coil spring 13 that biases a bonded piston seal (BPS) is provided on the inward flange portion 1c. One end is in contact with the outer peripheral side of this plane.
[0034]
A seal lip 3 is provided at the outer peripheral end of the outward flange portion 1b, and the seal lip 3 is in sealing contact with the inner peripheral surface of the outer peripheral side cylindrical portion of the bondet piston seal.
[0035]
Then, on the surface of the bondet canceller seal 1 opposite to the piston chamber 11 (the lower surface in FIG. 6), four protrusions 2 are arranged in the circumferential direction from the inner peripheral side. The protrusion 2 is locked by a snap ring 12 attached to the shaft 10, thereby restricting the movement of the bondet canceller seal 1 in the axial direction and preventing eccentricity.
[0036]
Here, as a feature of the protrusion 2 of the bonded canceller seal 1 according to the present reference example , as shown in FIG. 1A, the shape of the protrusion 2 is only at the inner corner 2a in contact with the snap ring 12. The corner 2b on the outer peripheral side is also chamfered with a rounded shape. That is, all the corners 2a and 2b of the protrusion 2 are rounded so that the corners 2a and 2b are not sharp.
[0037]
By forming the protrusion 2 in such a shape, even when the bondet canceller seal 1 is subjected to pressure (centrifugal oil pressure), the radius of the corner 2b on the outer peripheral side of the protrusion 2 disperses the stress generated in the protrusion 2, and the protrusion 2 2 does not cause stress concentration in the outer peripheral side corner 2b, can prevent the bondet canceller seal 1 from being damaged, and has excellent pressure resistance.
[0038]
(Second Reference Example ) FIGS. 2 and 3 show a second reference example . 2A and 2B are a plan view and a half sectional view showing a protrusion of the bondet canceller seal according to the second reference example , and FIG. 3 is a half showing another example of the protrusion of the bondet canceller seal according to the second reference example. It is sectional drawing.
[0039]
As a feature of the protrusion 2 of the bonded canceller seal 1 according to this reference example , as shown in FIG. 2 (b), which is a cross section taken along the line AA of FIG. 2 (a), at least the outer periphery and the radial periphery of the protrusion 2 are Unlike the conventional vertical rising side, it has a gentle rising side. Specifically, at least the outer periphery of the protrusion 2 and the side surface of the periphery in the radial direction are formed as an R surface 21 that is gently recessed and raised in an R shape. The R surface 21 is formed on the outer circumference and the circumference in the radial direction excluding the inner circumference of the protrusion 2 shown in the region B of FIG. Further, it is desirable that the dimension of the R surface 21 is maximized with respect to the height of the protrusion 2 because it is more effective.
[0040]
By forming the side surface of the region B of the protrusion 2 so as to rise gently, even if the bondet canceller seal 1 is subjected to pressure (centrifugal oil pressure), the range in which the stress generated in the vicinity of the protrusion 2 is increased. The stress concentration in the region O in the vicinity of the protrusion 2 is alleviated and it is difficult for the stress to become excessive, the damage of the bondet canceller seal 1 can be prevented, and the pressure resistance can be excellent.
[0041]
In addition, although the R surface 21 raised in the shape of the dent R is given as the gentle side surface of the protrusion 2, it is not limited to this, and a vertical surface such as a gently inclined taper surface 22 as shown in FIG. The same effect can be obtained with different inclined surfaces.
[0042]
Moreover, although the gentle side surface of the protrusion 2 is formed in the region B in FIG. 2A which is the outer periphery and the radial periphery excluding the inner periphery of the protrusion 2, the shape of the snap ring 12 is not limited thereto. If the entire circumference including the inner circumferential surface of the protrusion 2 is changed to a gentle side surface by changing (preventing interference), the effect is further improved.
[0043]
The (implementation of Embodiment) FIG. 4, the form of implementation is shown. Figure 4 is a plan view and a cross-sectional view showing the protrusion of Bonn debt canceller seal according to an exemplary implementation.
[0044]
As a feature of the protrusion 2 of the bonded canceller seal 1 according to the present embodiment, FIG. 1 is a cross-sectional view taken along line AA ′ to CC ′ of the protrusion 2 in FIG. 1B of the first embodiment. As shown in (c), the inner periphery of the protrusion 2 is different from the vertically rising side surface, and the center is a vertically rising side surface, and the side surface becomes gentler toward both ends. Specifically, the EE ′ cross section of FIG. 4B showing the center of the protrusion 2 is such that the side surface of the inner periphery rises vertically as shown in FIG. 4C and goes from the center of the protrusion 2 to both ends. The DD ′ section and the FF ′ section in the middle of FIG. 4B gently raise the side surface of the inner periphery as shown in FIG. 4C. The inner peripheral side surface is further gently formed from the center toward both ends.
[0045]
By forming the inner peripheral side surface of the protrusion 2 so as to rise gently from the center toward both ends, only the central vertical side surface of the inner periphery of the protrusion 2 contacts the snap ring 12, and the protrusion 2 The center of the inner periphery of the protrusion secures the retaining property with the snap ring 12, and even if the bondet canceller seal 1 receives pressure (centrifugal oil pressure), both ends of the inner periphery of the protrusion 2 where stress concentrates rise gently. The stress is relaxed and the stress is not excessively increased, the bondet canceller seal 1 can be prevented from being damaged, and the pressure resistance can be improved.
[0046]
In the present embodiment, the outer periphery other than the inner periphery of the protrusion 2 and the radial periphery also have the effect as a side surface that rises gently like the second reference example .
[0047]
In addition, this shape can be applied even when a general oil seal requires setting of equidistant protrusions on the metal ring.
[0048]
( Third Reference Example) FIG. 5 shows a third reference example. FIG. 5 is a plan view showing protrusions of a bondet canceller seal according to a third reference example.
[0049]
The feature of the protrusion 2 of the bonded canceller seal 1 according to the present reference example is that the protrusion 2 is formed in an annular protrusion that goes around the shaft 10 around, unlike the conventional technique and the above-described embodiment.
[0050]
If the inner peripheral side surface can be locked so as to be locked to the snap ring 12 attached to the shaft 10 so that the inner peripheral side surface is substantially vertical or the like, the outer peripheral side surface has any shape (for example, gentle May be a slope).
[0051]
In such a protrusion 2, even if the bondet canceller seal 1 receives pressure (centrifugal oil pressure), the protrusion 2 that is an annular protrusion does not concentrate stress, and the stress is dispersed and is not easily excessively stressed. It is possible to prevent the bondet canceller seal 1 from being damaged and to have excellent pressure resistance.
[0052]
Further, the shape of the projection 2 which is an annular projection is a simple annular shape, and since the shape is simplified, it is easy to manufacture without causing cracks in the vicinity of the projection during press manufacturing.
[0053]
【The invention's effect】
As described above, in the present invention, the corner on the outer peripheral side of the protrusion is also rounded, so that even if the annular member receives pressure, the rounded corner on the outer peripheral side of the protrusion disperses the stress generated in the projection, Stress concentration does not occur in the corners on the outer peripheral side, the annular member can be prevented from being damaged, and the pressure resistance can be excellent.
[0054]
Further, in the present invention, at least the outer periphery of the protrusion and the periphery in the radial direction are gentle side surfaces, so that even if the sealing device receives pressure, the range of receiving stress in the vicinity of the protrusion is widened. The stress concentration is alleviated and the stress is hardly increased, the sealing device can be prevented from being damaged, and the pressure resistance can be improved.
[0055]
Furthermore, in the present invention, the inner periphery of the protrusion is a side surface that rises vertically at the center and gently rises toward both ends, so that only the center of the inner periphery of the protrusion comes into contact with the locking member. The center of the inner circumference of the projection ensures the retention with the locking member, and even if the sealing device receives pressure, both ends of the inner circumference of the protrusion where stress concentrates rise gently to ease the stress and overstress It becomes difficult to become, it can prevent that a sealing device is damaged, and it can be excellent in pressure | voltage resistance.
[Brief description of the drawings]
FIGS. 1A and 1B are an enlarged plan view and a cross-sectional view showing a protrusion of a bondet canceller seal according to a first reference example . FIGS.
FIGS. 2A and 2B are an enlarged plan view and a half sectional view showing a protrusion of a bondet canceller seal according to a second reference example . FIGS.
FIG. 3 is a half sectional view showing another example of a protrusion of a bondet canceller seal according to a second reference example .
4 is a plan view and a cross-sectional view showing an enlarged projection of Bonn debt canceller seal according to an exemplary implementation.
FIG. 5 is an enlarged plan view showing a protrusion of a bondet canceller seal according to a third reference example.
FIG. 6 is a half cross-sectional view showing a schematic configuration of a shift switching unit.
FIG. 7 is an enlarged plan view showing protrusions of a conventional bonded canceller seal.
FIGS. 8A and 8B are a plan view and a half sectional view showing, in an enlarged manner, protrusions of a conventional bonded canceller seal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bonded canceller seal 1a Cylindrical part 1b Outward flange part 1c Inward flange part 2 Protrusion 2a, 2b Corner 3 Seal lip 10 Shaft 11 Piston chamber 12 Snap ring 13 Coil spring 21 R surface 22 Tapered surface

Claims (1)

A cylindrical portion extending in the axial direction;
An outward flange portion provided outward from one end portion of the tubular portion, and having a seal portion at an outer peripheral end in sliding contact;
An inward flange portion that is provided inward from the other end portion of the cylindrical portion and has a protrusion on the other surface in the axial direction that comes into contact with the outer peripheral surface of the snap ring attached to the inner peripheral shaft;
In a sealing device comprising:
The inner peripheral side surface of the protrusion is a vertical surface that rises vertically at the center, and as it goes to both ends, the edge of the boundary with the surface on the other axial side of the inward flange portion is the outer peripheral surface of the snap ring . And a sloping surface that gently rises from the edge so as to increase gradually from the center toward both ends .

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