JPS5969508A - Piston type hydraulic actuator - Google Patents

Abstract

PURPOSE:To secure such an actuator as being small in slide resistance in a piston and capable of sliding the piston in proportion to the pressurizing force of a pressure fluid, by making up each piston installed on both ends of a piston rod so as to cause it to couple with a cylinder via a cuplike diaphragm. CONSTITUTION:Each of front-rear covers 3 and 4 is secured to both ends of a cylinder body 2, and a piston rod 12 is slidably guided by a bearing 10 secured tight to the inner surface of this cylinder body 2 with a screw 11. From both sides at the central part of the piston rod 12, each of fixed projecting parts 13 and 14 is installed, which project outward from a long hole 15 made up in a side axial direction of the cylinder body 2. In addition, each of pistons 16 and 17 is secured to both ends of the piston rod 12, and these pistons 16 and 17 are coupled with the cylinder body 12 via each of cuplike diaphragms 23 and 24 carrying each of turnup parts 27 and 28 capable of rolling movements. With this method, pressure chambers 33 and 34 are made up inside the cylinder body 2 and thereby those of leading in-and-out passages 35 and 36 formed in these fixed projecting parts 13 and 14 are forced to open.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston-type fluid operating device using a force pump-like diaphragm. is exposed to the atmosphere, so the pressure receiving area of the fluid pressure applied to the piston in one direction and the pressure receiving area of the fluid pressure in the other direction are equal to the cross-sectional area of the piston rod in the piston on the piston rod forming side. However, the piston is different from a piston that does not form a piston rod, and as a result of the difference in pressure receiving area, the piston moves in the direction in which the piston rod is formed even if the same fluid pressurizing force is applied to one direction and the other direction of the piston at the same time. Therefore, in order to balance the force of movement of the piston in one direction and the other, it was necessary to apply a pressure equal to the cross-sectional area of the piston rod to the piston, which was extremely difficult to adjust. . In addition, when the piston rod connected to the piston is exposed to the atmosphere, it must be sealed with a sealing material such as a gasket or an O-ring, but this sealing material creates strong resistance to the piston rod when the piston slides, causing stress. This has resulted in the drawback that the sliding movement of the piston, which is precisely proportional to the pressurizing force of the pressurized fluid, is extremely difficult. In order to eliminate this drawback, the present invention considered a method in which the piston and piston rod are fixedly positioned and the cylinder is moved forward and backward. This method has the advantage of significantly reducing sliding resistance compared to the conventional method and making the pressure receiving area of the fluid pressure the same in one direction of the piston and in the direction of the pond. Since it connects the inlet and outlet pipes, the pressurized fluid inlet and outlet pipes also move as the cylinder moves forward and backward, causing bending and tension in the inlet and outlet pipes, so the sliding resistance of the piston rod is reduced. It has not been possible to completely eliminate this, and it has been difficult to ensure that the piston slides in proportion to the pressurizing force of the pressurized fluid.

The present invention reliably eliminates the drawbacks mentioned in (-) above, and includes a fixed protrusion that is slidably fixed in the cylinder via a bearing, a fixed protrusion provided on the side surface of the cylinder, and a piston at both ends. A piston rod provided with a bottom plate is connected to the outer end of each piston, and a cup-shaped diaphragm is fixed to the sill through a folded part that can be rolled. And this power pump-shaped diaphragm and Schilling-
A pair of pressurized chambers are formed between both end walls provided in the axial direction, and pressurized fluid is introduced through the piston rod through the end face of the fixed protrusion so that one end of each pressurized chamber is opened. By forming it in this way, it is possible to equalize the pressure receiving area of the pressurized fluid in one direction of the piston and in the direction of the pond, and completely eliminate the tightening resistance of the seal member to the screw and bolt. Since the pressurized fluid inlet and outlet passages are drilled and formed in the fixedly located piston rod, the pressurized fluid inlet and outlet pipes do not move as the cylinder moves forward and backward. The sliding resistance of the piston is extremely small.

An example of this will be explained below with reference to the drawings. (1) is a cylinder, one cylinder main body (2) has a front cover (3) at one end, and a rear cover (4) at the other end. They are connected and fixed by fixing rings (5) and (6), respectively, and both end walls (7
) (8) is formed. (10) is the cylinder body (
2) is a bearing fixed to the inner surface of the piston rod (12) by a screw (11), formed by a slide bearing,
is slidably fixed. (13) (+4.) is a fixed protrusion protruding from both axial sides of this piston rod (12), and extends outward from a long (15) bored in the axial direction of the side surface of the cylinder body (2). It protrudes and is fixed to an appropriate device in which the product of the present invention will be installed. (16) and (17) are pistons fixed to both ends of this piston rod (12) with fixing screws (18) and (19), and the inner peripheral surfaces of the main body (2) and the front and rear covers (3) and (4) An appropriate sliding interval (21) (22) is formed between the two. (23) (24
) is a bottom plate (25) on both end surfaces of the pistons (16) and (17).
A cup-shaped diaphragm coated with (26), made of a thin film made of a composite of a cloth such as polyester and a rubber-like elastic body, and capable of rolling movement formed by sliding intervals (21) and (22). - The mounting parts (31, 32) at one end are attached to the front and rear covers (3) (4>) and the cylinder body (2) through folded parts (27, 28) having a U-shaped cross section. (33) and (34) are this cup-shaped diaphragm (
23) (24) and both end walls (7) (8) of Siringu (1)
) The pressurized chamber is connected to a fluid supply device via a seven-lead regulator (not shown) that controls the flow of pressurized fluid. (35036) is an introduction/outlet passage for introducing and extracting pressurized fluid from the fluid supply device into the pressurizing chambers (33), (34,), and the inside of the piston rod (12) from each end face of the fixed protrusion u3) (14). Penetrate and fixing screw (
The cup-shaped diaphragms (23) (24) are formed so that one end thereof is opened to the pressurizing chambers (33) (34) through the inlet ports (37) and (38) of the diaphragms 1, 8) and (19).
), the pressure receiving area of the pressurized fluid is made the same.

In other different embodiments, the fixed protrusion protrudes only on the - side of the piston rod (12), and the inlet/outlet passage (35) (36
) may be formed in parallel, and the inlet and outlet passages (35) and (3
6) with a separate fixed protrusion having an inlet/outlet passage (35) (
36). (41) is a working protrusion that is fixed and protrudes from the front cover (3) of the cylinder (1), and is formed into an appropriate shape so as to be convenient for attaching a member corresponding to the purpose of the device in which the product of the present invention is installed. do.

'' In a double-unit configuration, a constant pressure fluid is introduced from the fluid supply device via a bleed type regulator, etc., and is supplied to the pressurized chambers (33) (34) from the outlet passages (35) (36).
,), the pressurized chamber (
The piston rod (12) is placed on the pressure chamber (34) or (33) side which is supplied with weak pressure fluid from (33) or (34).
) tries to move, but as mentioned above, the piston rod (
12) fixes the fixed protrusions (13) and (14) at appropriate positions of the device using the present invention, so the piston rod (
12) and the pistons (16) (17>) are held in place while the cylinder (1) is moved together with the working protrusion (41) into the folded portion (23) (24) of the cup-shaped gouya 7 ram (23) (24).
27)<28) 7- Move while rolling. This movement occurs only when there is a difference in the pressure of the pressure fluid supplied to the pressurizing chambers (33) and (34) because the pressure receiving areas of the camp-shaped Guya 7 rams (23) and (24) are the same, As in the case where a piston rod protrudes from the pressure receiving side of one or the other piston, and the pressure receiving areas of the pistons are made different,
Even if there is a pressure difference in the pressure fluid, the piston will not be able to operate or will not operate beyond the pressure difference.

Therefore, if pressure fluid of the same pressure is introduced into the pressurizing chambers (33) (34,) through the bleed type regulator, it will flow through the cup-shaped Guyar 7 rams (23, 24) into the piston (1).
6) The pressure applied to (17) is easily balanced. In addition, the piston rod (12) is not connected to sealing materials such as banking or O-rings as in the past, and the cylinder (1), which moves forward and backward, is not connected to pressure fluid inlet and outlet pipes, etc. Fluid introduction and outlet passages (35) (36
) is formed on the fixedly positioned piston rod (12), so there is no sliding resistance on the moving cylinder (1), and the pressure chambers (33) and (34) It becomes possible to transmit approximately the same output as the applied pressure fluid to the cylinder (1), and if a constant pressure is supplied to the inlet and outlet passages (35) and (36) via a Bully 1ζ' type regulator, etc. It becomes possible to always supply an output corresponding to the supply pressure to the working protrusion (41). The supply pressure to the working protrusion (41) is
Since the cylinder (1) and pistons (16) and (17) do not change even if they move relative to each other, it is useful when scribing lines on the surface of a workpiece that is to be mechanized. -1- Even if the workpiece is made of a material that is easily damaged and has small irregularities on the surface, it is possible to always contact the scribing sword etc. with the same pressure to the workpiece surface. The follow-up contact pressure can be easily set by the pressure of the pressurized fluid. Therefore, in addition to the ``double scoring device'', it can also be used as a ``tracing'' device that moves the cutter following a template or model to reproduce the shape of the template or model on the workpiece. 79- In addition, the present invention enables an extremely wide range of applications.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. (1)・・・・・・・・・・・・Cylinder (7)(
8)・・・・・・・・・Both end walls (10)...
・・・・・・・・・・・・Bearing (12)・・・・・・・
...Piston rod (13) (14)...
... Fixed protrusion (16) (17) ......
Pistons (23) (24)...Power pump-shaped guyafram (25) (26)...Bottom plate (2
7)(28)・・・・・・・・・Folding part (31)(
32)...Mounting part (33) (34,
)・・・・・・・・・・・・ Pressurized chamber (35) (36)・・
......Introduction exit route 10- JP-A-59-69508 (4)

Claims (1)

[Claims] A piston rod that is slidably fixed inside the cylinder via a bearing, has a fixed protrusion on the side that projects outside the cylinder, and has pistons on both ends, and a bottom plate is connected to the outer end of each piston. Between the cup-shaped gouya 7 ram fixed to the cylinder through the folded part that allows rolling movement of the attachment part of the other end opening, and the cup-shaped gouya 7 ram and both end walls provided in the axial direction of the cylinder. A piston type device comprising: a pair of pressurizing chambers formed in the pressurizing chamber; and an inlet/outlet passage for pressurized fluid passing through the piston rod from the end face of the fixed protrusion so as to open one end of each of the pressurizing chambers. Fluid operated device.