JPS622155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized in that the bottom plate of one end of a pair of cup-shaped diaphragms is placed on both ends of the piston in the moving direction of the piston, and the opening edge of the other end of the cup-shaped diaphragm is connected to the cylinder via a folded part. The object of the present invention is to easily connect and fix the piston to a cup-shaped diaphragm that places a bottom plate on the piston in a piston-type fluid actuating device fixed to the piston, and to connect the piston and the piston rod easily and reliably. That is.

Prior Art Conventionally, in order to fix a piston rod to a piston, as described in Japanese Patent Application Laid-open No. 56-72276, one end of the piston rod is protruded from one end wall of the piston, a nut is screwed and fixed to this protrusion, and the piston rod is fixed via the nut. A method of inserting a cotter pin to prevent loosening into the protrusion has been used, but this method not only requires a lot of effort to assemble, but also has the disadvantage that the nut, where the moving force of the piston rod is concentrated, tends to loosen.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems by reliably connecting and fixing the piston and piston rod without causing any loosening, and by eliminating the need for this connection work. This is intended to be easy to do.

Means for Solving the Problems The present invention solves the above problems by:
A piston rod is inserted into a cylinder that has pressurized fluid introduction and outlet ports on both ends of the cylinder, and the bottom wall of a cylindrical fixed body is brought into contact with one surface of a fixed flange that protrudes from the outer periphery of the piston rod. A cylindrical piston clamping body attached to the outer periphery of the fixed body is placed in contact with the other side of the fixed flange, and a piston bent inward in the opposite direction facing the clamping body The annular flange of the fixed body, which is bent outward in the opposite direction facing the bottom wall, is placed in contact with one end wall, and the annular flange of the fixed body and the one end wall surface of the piston are in contact with one another in the shape of a cup. The bottom plate at one end of the diaphragm is inserted and fixed, and the opening edge at the other end of the cup-shaped diaphragm is fixed to the cylinder via a folded part that can be rolled.
Further, the opening edge of the other end of the cup-shaped diaphragm, which has the bottom plate connected to the clamping body of the piston, is fixed to the cylinder via a folded part that can be rolled, and the piston and the fixed body are fixed with a stopper. It is what it is.

Function Since the present invention is configured as described above, there is no need to use a nut to fix the piston rod to the piston, and the fixing collar protruding from the outer periphery of the piston rod is held between the clamping body and the fixing body, and the piston is fixed to the piston. Since the forward and backward movement is transmitted to the piston rod, there is no possibility of loosening of the fixed relationship between the piston rod and the piston, unlike in the past. In addition, the clamping body and the fixed body can clamp the fixed collar by simply fixing the clamping body and the fixed body with appropriate fasteners such as screws, and the annular collar of the fixed body and one end wall of the piston are pressed together via the bottom plate. This makes assembly work easier, and the number of parts can be reduced compared to the conventional method.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 1. Reference numeral 1 denotes a cylinder, and one end of the main body 2 is connected to a front cover 4 having a fixed flange 3 protruding from the outer circumferential surface. Similarly, a rear cover 6 having a fixed flange 5 protruding from the outer circumferential surface is connected to the cylinder 1, and the fixed flanges 3 and 5 are connected with bolts 7 and nuts 8 and 9 to assemble the cylinder 1 in one piece. A piston 11 is inserted into the cylinder 1 with an appropriate sliding interval 12, and a bottom plate 14 of a cup-shaped diaphragm 13 is placed on the outer surface toward the other end, and the cup-shaped inner surface of the cup-shaped diaphragm 13 is placed on the outer peripheral surface. The other end of the cup-shaped diaphragm 13 is formed into a folded part 15 having a U-shaped cross section.
It is inserted and fixed between the end faces of. 17, a mounting flange 18 at the other end is inserted and fixed between the main body 2 of the cylinder 1 and the front cover 4 via a folded part 19;
A cup-shaped diaphragm separate from the above-mentioned one has a bottom plate 23 at one end mounted on the outer surface of one end wall 22 of the piston 11. Reference numeral 24 denotes a fixing body having an annular collar 25 projecting from one end of the outer periphery for press-fixing the bottom plate 23 to the one end wall 22. The fixing body has a U-shaped cross section, and the bottom wall 27 connecting one end of the cylindrical wall 26 is attached to a piston rod. It is in contact with one surface of a fixed collar 29 fixedly protruding from the outer periphery of 28. Reference numeral 31 denotes a clamping body that is in contact with the other surface of the fixed collar 29, and is formed separately from the piston 11.
By interposing the bottom plate 14 of the cup-shaped diaphragm 13 placed on the piston 11 and the bottom wall 27, and fixing it integrally with the fixed body 24 with a stopper 32 such as a screw, piston 1
1. The fixed body 24 and the piston rod 28 are integrally connected and fixed. Reference numeral 33 designates one pressurizing chamber provided in the cylinder 1 on the side of the clamping body 31 of the piston 11, and forms an introduction port 34 through which pressurized fluid is introduced and taken out. Reference numeral 35 designates the other pressurizing chamber provided in the cylinder 1 on the side of the fixed body 24 of the piston 11, which forms an introduction port 36 for introducing and discharging pressurized fluid. When the pressurized fluid is introduced from this introduction port 36, the piston 11
moves toward the pressurizing chamber 33 on the one hand, and moves toward the pressurizing chamber 3 on the other hand.
When pressurized fluid is introduced into the pressurizing chamber 3, the piston 11 moves in the direction of the other pressurizing chamber 35. This forward and backward movement of the piston 11 is transmitted to the piston rod 28 via the fixed collar 29 held between the clamping body 31 and the fixed body 24. Reference numeral 37 denotes a support body that supports the other end of the piston rod 28 via a bearing 38, and it projects inwardly of the front cover 4 and also projects the other end of the piston rod 28 outwards to connect the piston rod 28 to the target working mechanism. A mounting portion 39 is provided.

In the structure as described above, a nut is not used to fix the piston rod 28 to the piston 11, and the fixing collar 29 protruding from the outer periphery is held between the clamping body 31 and the fixing body 24, and the piston 11 is Since the forward and backward movement is transmitted to the piston rod 28, there is no possibility that the fixed relationship between the piston rod 28 and the piston 11 will loosen as in the conventional case. Furthermore, the clamping of the fixing collar 29 by the clamping body 31 and the fixed body 24 is achieved by attaching the clamping body 31 and the fixed body 24 to a fastener 3 such as a screw.
2, the annular collar 2 of the fixed body 24
5 and one end wall 22 of the piston 11 through the bottom plate 23, the assembly work is simple and the number of parts can be reduced compared to the conventional method.

In the above embodiment, the piston 1 of the fixed collar 29
1 was achieved by connecting the clamping body 31 formed separately from the piston 11 to the bottom wall 27 of the fixing body 24, but in other different embodiments, as shown in FIG. This is done by using the other end wall of the piston 11 as the clamping body 31 and fixing the one end wall 22 and the annular collar 25 with a stopper 32 such as a screw, without forming the clamping body 31 separately. In this case, the fixed collar 29 is a clamping body 31 formed integrally with the piston 11.
One side is in contact with the fixed body 24 and the other side is in contact with the fixed body 24.
By abutting against the bottom wall 27 of the piston rod 27 and tightening the stopper 41, the fixed collar 29 is strongly clamped between the inner surface of the clamping body 31 and the outer surface of the bottom wall 27, and the forward and backward movements of the piston 11 can be transmitted to the piston rod 28. can.
According to this second embodiment, the clamping body 31 is formed integrally with the piston 11, and the stopper 32 penetrating the clamping body 31 is not required.
There is no need to form a notch for one end to be inserted, and the pressurized liquid that permeates through the base fabric of the cup-shaped diaphragm 13 from the notch end face of the notch can be prevented from flowing out, and there is no need to drill holes in the notch. Become. Also, a clamping body 31 formed separately from the piston 11
Further, the stroke of the piston 11 in the cylinder 1 can be increased by the thickness of the head of the stopper 32 that fixes the stopper 32 to the fixed body 24, thereby making it possible to downsize the entire device. Further, in the first embodiment, a fixed flange 5 was formed, but in the second embodiment, a fixed flange 5 was formed at the connection part between the front and rear covers 4 and 6 of the main body 2.
By inserting the fixing rings 42 and 43, the main body 2 and the front and rear covers 4 and 6 are connected, eliminating the need for the fixing flanges 3 and 5.

Effects of the Invention Since the present invention is configured as described above, there is no need to use a nut to fix the piston rod to the piston, and the fixing collar protruding from the outer periphery of the piston rod is held between the clamping body and the fixing body, and the piston Since the forward and backward movements of the piston rod can be transmitted to the piston rod, there is no loosening of the fixed relationship between the piston rod and the piston, unlike in the past.
In addition, the clamping body and the fixed body can clamp the fixed collar by simply fixing the clamping body and the fixed body with appropriate fasteners such as screws, and the annular collar of the fixed body and one end wall of the piston can be pressed together through the bottom plate. This makes the assembly work simple and the number of parts can be reduced compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing a first embodiment of the present invention;
FIG. 2 is a full sectional view showing the second embodiment. 11... Piston, 13, 17... Cup-shaped diaphragm, 14, 23... Bottom plate, 15, 19...
...Folded part, 24... Fixed body, 25... Annular collar,
27...bottom wall, 28...piston rod, 29...
... Fixed collar, 31 ... Clamping body, 32 ... Stop.

Claims (1)

[Claims] 1. A piston rod is inserted into a cylinder that has pressurized fluid introduction/outlets provided at both ends of the cylinder, and the bottom wall of a cylindrical fixed body is brought into contact with one surface of a fixed collar protruding from the outer periphery of the piston rod. At the same time, on the other side of the fixed collar, a cylindrical piston clamping body attached to the outer periphery of the fixed body is placed in contact with the piston, and the piston is bent inward in the opposite direction facing the clamping body. An annular flange of a fixed body bent outward in the opposite direction facing the bottom wall is placed in contact with one end wall, and one cup is connected to the annular flange of the fixed body and one end wall of the piston. A bottom plate at one end of the cup-shaped diaphragm is inserted and fixed, and the opening edge of the other end of the cup-shaped diaphragm is fixed to the cylinder via a folded part that can be rolled, and the bottom plate is connected to the holding body of the piston. A piston type fluid operating device characterized in that the opening edge of the other end of the diaphragm is fixed to the cylinder via a folded part that can be moved in a rolling manner, and the piston and the fixed body are fixed with a stopper.