JPS60129430A - Fluid pressurizing device - Google Patents

Abstract

PURPOSE:To provide a stroke larger than that obtained by ring-like bellows, by forming only one concave surface in each of thin plates connecting between rigid plates, along the peripheral direction of the latter, having a maximum radius of curvature with respect to the outside. CONSTITUTION:Two ring-like rigid plates 15, 16 are connected together at their outer edges and at their inner edges by means of thin plates 17, 18 each of which forms only one concave surface along the peripheral direction of the plates 15, 16, having a muximum radius of curvature with respect to the outside. Due to this connection a doughnut-like space is defined between the rigid plates 15, 16 and the thin plates 17, 18. Further, the outside surfaces of both rigid plates 15, 16 are used as pressurizing surfaces which are storked by pressurized fluid which is introduced under pressure into the doughnut-like space 19. With this arrangement, a stoke which is larger than that obtained by conventionally used ring like-bellows may be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluid pressurizing device that generates pressurizing force using pressurized fluid, such as a pressurizer. [Prior Art and its Problems] A typical example of a conventional fluid pressurizing device is a hydraulic cylinder, which is used, for example, to press and brake a friction plate in a clutch device. This hydraulic cylinder presses and brakes the friction plate by stroking the piston with hydraulic pressure and generates a pressurizing force, but if the piston is formed into a ring shape, the compact structure allows it to be used in a narrow ring-shaped area. It becomes possible to apply a large pressing force to the However, the cylinder and piston, which are formed in a "J" shape, are difficult to machine because of their complicated structure, and unless they are machined with great precision, they can cause oil leaks and reduce work efficiency.

In order to solve this problem, the present inventor previously proposed the use of a ring-shaped bellows made of a thin plate layer that expands and contracts when pressurized fluid is injected therein, instead of a hydraulic cylinder. However, although this ring-shaped bellows can solve the above manufacturing problem, it is difficult to apply to applications that require a large stroke because it can only provide a small stroke due to internal stress. Ta.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a fluid pressurizing device that can generate a larger stroke than conventional ring-shaped bellows.

[Structure of the invention]

The fluid pressurizing device of the present invention that achieves the above object has two ring-shaped rigid plates whose outer peripheries and inner peripheries are connected to each other.
Each concave surface having a maximum radius of curvature relative to the outside is connected to each other by a thin plate formed along the circumferential direction, and this connection forms a donut-shaped space inside surrounded by the rigid plate and the thin plate. , the outer surfaces of the two rigid plates are respectively used as pressurizing surfaces, and the pressurizing surfaces are stroked by pressurized fluid pressurized into the donut-shaped space.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

FIG. 1 shows a planetary gear mechanism clutch using the fluid pressurizing device of the present invention. In this Figure 1, 1
is a casing, and an input shaft 2 is provided on one side of the casing, and an output shaft 3 is provided on the other side.
A planetary gear mechanism 4 is interposed between them. A sun gear 5 is fixed to the end of the input shaft 2, and planet gears 6 are arranged around the sun gear 5 so as to mesh therewith. This planetary gear 6 is rotatably supported by a shaft 7a of a carrier 7 fixed to the output shaft 2. Further, a ring-shaped internal gear 8 meshes with the outer periphery of the planetary gear 6.

The internal gear 8 is not fixed to the casing 1 and is in a floating state, and has a lip portion 8a extending in the radial direction on its outer periphery. A friction plate 9 faces this rib portion 8a, and a ring-shaped fluid pressurizing mechanism IO according to the present invention is provided on the back side of the friction plate 9. The friction plate 9 meshes with a spline 11 formed on the inner surface of the casing 1 and is slidable in the axial direction. Further, the ring-shaped fluid pressurizing mechanism 10 is fixed via a supply pipe 12 installed inside the casing 1, and hydraulic oil is supplied and discharged via the supply pipe 12.

As shown in FIGS. 2A and 2B and enlarged in FIG. They are formed by connecting and welding the inner peripheral edges to each other with highly elastic metal thin plates 17 and 18, respectively. Due to such joining, the rigid plates 15, 16 and the thin metal plates 17.
A donut-shaped space 19 surrounded by 18 is formed. The above thin metal plate 17.1'8: is preferably made of a material with high elasticity such as steel.I have one concave surface with a maximum curvature and radius R relative to the outside as shown here. This is so that it is surrounded along the circumferential direction.

In the case of Fig. 2.3, the welded ends of the thin metal plates 17 and 18 are the rigid plates 15 and 15.・This type of connection is most desirable in order to obtain the maximum radius of curvature on the circumferential surface, but from the viewpoint of making welding easier, the As shown in Figure 4, a thin metal plate 17. i
The ends of s may be welded so as to be in contact with the outer and inner edges of the rigid plate 15.16. Even in the case of the fourth m', it is necessary to take great care to form only one concave surface with a maximum radius of curvature R on the metal thin plates 17 and 18 to the outside.

When hydraulic oil is supplied from the supply pipe 12 to the fluid pressurizing mechanism 10 described above, only the supporting surface side of the casing shown in FIG. While expanding the thin metal plates 17 and 18 toward the outside, the front and rear rigid plates 15 and 16 are stroked so as to be relatively spaced apart. Due to such relative separation movement, the rigid plate 15. ．． The outer surfaces of the internal gears 16 serve as pressure surfaces, and press the friction square plate 9 toward the internal gear 8 (3a). Due to this pressing, the internal gear 8 is pressed against the friction plate 9 and the casing 1. Since the shaft I is clamped and fixed in between, the power of the input shaft 2 is transmitted to the output shaft 3 via the planetary gear mechanism 4.

On the other hand, when the supply of hydraulic oil is released, the fluid pressurizing mechanism 10 returns to its original position due to the elastic recovery force of the thin metal plates 17 and 18, so the friction plate 9 separates from the rib 8a and the internal gear 8
make it idle again. Therefore, power transmission from the input shaft 2 to the output shaft 3 is interrupted.

As is clear from the theoretical calculations described below, the fluid pressurizing mechanism 10 described above is composed of a ring-shaped rigid plate 15.1 made of a thin metal plate 27.28 having a large number of folds as shown in FIG.
Ring-shaped bellows 20 connecting the inner and outer edges of 6
The axial stroke of the rigid plate 15,16 can be significantly increased compared to the above.

That is, in each of the devices shown in Fig. 3 and Fig. 5, the distance between the rigid plates 15 and 16 when no hydraulic oil is applied is l, and the bispanability when hydraulic oil of internal pressure P is applied. Let the relative strokes of plates 15 and 16 be δb in the case of FIG. 3, respectively.

If the case of Fig. 5 is δa, each stroke δ
b and δa can be calculated as follows. That is, the radius of curvature R of the concave surface of the former thin plate 17.18 is 12/2.
, the radius of curvature r of the concave surface of the latter thin plate 27.28 is β/4X
2 (because the number of folds is 4), but ζ (however, E is the elastic modulus of the thin plate, and ■ is the section modulus of the thin plate). Therefore, the above (J), (From the 2+ formula, δb = 16
δa is obtained. That is, it can be seen that in the case of the fluid pressurizing mechanism according to the present invention shown in FIG. 3, a stroke 16 times that of the ring-shaped bellows having four folds, which is a comparative example shown in FIG. 5, can be obtained.

Also, looking at the stress acting on the thin metal plate due to the internal pressure of the hydraulic oil, in the case of the comparative example shown in Fig. 5, the numerous folds of the thin plate 27 and 28 alternately form both concave portions and convex portions to the outside. Therefore, expansion is applied to the convex portions, and compression is applied to the concave portions. The latter compression results in a buckling action on the thin metal sheet, and the former expansion results in a tensile action, but from the viewpoint of material mechanics, the strength of a thin metal sheet against the former is greater than against the latter. have. Therefore, in the case of the bellows shown in Fig. 5, the structure is unstable as the strength is distributed, but in the fluid pressurizing mechanism according to the present invention shown in Fig. 3, only one of the four parts is provided. Therefore, only compression acts, and the strength can be uniformly strengthened compared to the bellows shown in FIG.

Although it is optimal for the rigid plate and the thin plate to be made of metal as in the above embodiment, other elastic materials such as carbon fiber reinforced resin may be used if necessary.

〔Effect of the invention〕

As described above, in the fluid pressurizing device of the present invention, the shape of the thin plate connecting the outer circumferential edges and the inner circumferential edges of two ring-shaped rigid plates, respectively, has the maximum radius of curvature relative to the outside. Since the structure is such that only one concave surface is formed along the circumferential direction, as is clear from the theoretical calculations above, the relative stroke of the bisectable plate, which becomes the pressure surface, can be adjusted to have multiple folds. It can be greatly increased compared to a bloated velvet woman.

In addition, since the thin plate has only one concave surface with respect to the outside, it is possible to apply only compression that increases the strength against the internal pressure of the pressurized fluid, and the multi-fold bellows Its strength can be uniformly strengthened compared to .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a planetary gear mechanism clutch device incorporating the fluid pressurizing mechanism of the present invention. Figure A. B shows a fluid pressurizing mechanism provided in the clutch device, FIG. 2A is a longitudinal sectional view, and FIG. 2B is a front view showing only the right half;
Figure 3 is an enlarged sectional view of the main part of the mechanism in Figure 2, and Figure 4 is (
FIG. 5 is an enlarged cross-sectional view of the main part of a comparative example that is not based on the present invention. IO... Fluid pressurizing mechanism (device), 12... Supply pipe, 15.16... Ring-shaped rigid plate, 17° 18...
・Thin metal plate, 19...Doughnut-shaped space. Agent Patent Attorney Shin Ogawa - Patent Attorney Masaru Noguchi Patent Attorney Kazuhiko Saishita Figure 1 Figure 2 (A) (B) 7 Figure 3 Figure 4 Figure 2

Claims (1)

[Claims] "(2 pieces of Lf forming 6° shape) Raw board 0 The outer peripheral edges and the inner peripheral edges are each made with one concave surface that is concave with the maximum radius of curvature with respect to the outside; A tube is connected to each other by the thin plates formed by the above-mentioned thin plates, and this connection forms a donut hollow shape surrounded by the rigid plate and the thin groove on the inside.The outer surface of the two rigid plates is used as the pressure surface. A fluid pressurizing device characterized in that the pressurizing surface is stroked by pressurized fluid pressurized into the doughnut-shaped space.