JPH06323305A - Fluid pressure cylinder - Google Patents

Abstract

PURPOSE:To save space by independently driving plural driven bodies by one fluid pressure cylinder with the appropriate action line to the driven bodies. CONSTITUTION:A required number of cylinder chambers 12, 13 are connected in tandem, and pistons 15, 18 are fitted into the respective cylinder chambers 12, 13 to form a fluid pressure cylinder. Rods 16, 19 rigidly fixed to the pistons are formed into coaxial multi-shaft structure and driven independently by each fluid pressure cylinder, and each cylinder has the same action line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure cylinder driven by a fluid pressure such as compressed air or pressure oil.

[0002]

2. Description of the Related Art Of the fluid pressure cylinders, a conventional pneumatic cylinder will be described with reference to FIG.

The open end of the cylinder tube 1 is airtightly closed by a collar 2, a piston 3 is fitted in the cylinder tube 1 in an airtight and slidable manner, and a piston rod 4 is fixed to the piston 3. The piston rod 4 penetrates the collar 2 in an airtight and slidable manner.

The inside of the cylinder tube 1 is partitioned by a piston 3, a head side pressure chamber 5 and a rod side pressure chamber 6 are formed, and a port 7 is connected to the head side pressure chamber 5 and the port 7 is shown in the drawing. Not connected to the air pressure source via a switching valve. Also, a port 8 is provided in the rod side pressure chamber 6.
Are communicated with each other, and the port 8 communicates with an air pressure source via a switching valve (not shown).

When the head side pressure chamber 5 is communicated with the air pressure source from the port 7, air pressure acts on the head side pressure chamber 5 to move the piston 3 to the left in the figure, and also from the port 8 to the rod side. When the pressure chamber 6 is communicated with the air pressure source, air pressure acts on the rod side pressure chamber 6 to move the piston 3 to the right in the figure. Thus, the piston rod 4 can be moved in a desired direction by appropriately switching a switching valve (not shown) to select a communication state between the head side pressure chamber 5, the rod side pressure chamber 6 and the air pressure source.

[0006]

However, as is clear from the structure of the fluid pressure cylinder, one fluid pressure cylinder drives one driven body, and when there are a plurality of driven bodies. Has required as many fluid pressure cylinders as there are driven bodies. Therefore, the storage space for the fluid pressure cylinders is required for the number of fluid pressure cylinders. Further, since each fluid pressure cylinder has an independent structure and the respective action lines cannot be overlapped, the action center of the driven body and the action center of the fluid pressure cylinder may be different depending on the mode of acting on the driven body. Occasionally, the eccentricity had to be eccentric.

In view of the above situation, the present invention drives a plurality of driven bodies individually by one fluid pressure cylinder to save space and obtain a proper line of action for the driven bodies. Is what you are trying to do.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a required number of cylinder chambers are connected in tandem, and a piston is fitted into each cylinder chamber to form a fluid pressure cylinder. It is characterized by having a structure.

[0009]

The hydraulic cylinders are independently driven, and each cylinder has the same line of action.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The cylinder tube 10 has a first cylinder chamber 12 and a second cylinder chamber 13 which are partitioned by a partition wall 11. The first cylinder chamber 12 is airtightly closed by a rod cover 14, and the first cylinder chamber 12 is formed. The first piston 15 is fitted in the airtight and slidable manner. The first
A rod 16 fixed to the piston 15 penetrates the rod cover 14 in an airtight and slidable manner.

The second cylinder chamber 13 has a head cover 1
A second piston 18 is airtightly and slidably fitted in the second cylinder chamber 13 by being airtightly closed by 7. A rod 19 fixed to the second piston 18 is concentric with the rod 16, and penetrates the partition wall 11, the first piston 15, and the rod 16 in an airtight and slidable manner, and the tip of the rod 19 is the rod. It projects from 16.

The first piston 1 in the first cylinder chamber 12
A port 20 communicates with the rod side partitioned by 5, and a port 21 communicates with the head side, and a port 22 communicates with the rod side partitioned by the second piston 18 of the second cylinder chamber 13. However, the port 23 communicates with the head side.

The operation will be described below.

When compressed air is supplied from the port 21 from the state shown in the drawing, the first piston 15 moves leftward in the drawing. At this time, if compressed air is being supplied to the second cylinder chamber 13 from the port 22, the second piston 18 remains pushed rightward, and only the rod 16 projects. It should be noted that the rod 19 has a length that further projects from the rod 16 even when the rod 16 is maximally projected.

Next, when compressed air is supplied from the port 23 in the state shown in the drawing, the second piston 18 moves leftward, and the rod 19 projects leftward. The port 20
If compressed air is further supplied to the first cylinder chamber 12, the first piston 15 does not move while being pushed rightward.

Further, when compressed air is supplied from the port 21 to the first cylinder chamber 12 and from the port 23 to the second cylinder chamber 13 in the illustrated state, the first piston 15 and the second piston 15 respectively.
The pistons 18 respectively move to the left and the rods 16 and 19 project.

The first piston 15 and the second piston 18 are to the left of the first cylinder chamber 12 and the second cylinder chamber 13,
When the rods 16 and 19 move to the right from the protruding state, compressed air may be supplied from the ports 20 and 22, respectively.

As described above, the first piston 15 and the second piston 15
The pistons 18 have the same line of action and also drive independently.

Although air is used as the working fluid in the above embodiment, a liquid such as oil may be used, and the cylinder chamber is connected in tandem with 3 or 4, and the rod is triplet or quadruple. If penetrated, fluid pressure cylinders 3 and 4 having the same line of action can be constructed.

[0021]

As described above, according to the present invention, since a plurality of fluid pressure cylinders can be integrated into one, size reduction can be achieved, and the operation centers of the plurality of fluid pressure cylinders can be integrated on one axis. In addition, the degree of freedom in arranging the driven body is increased, and the action line with respect to the driven body can be optimized.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

 12 1st cylinder chamber 13 2nd cylinder chamber 15 1st piston 16 rod 18 2nd piston 19 rod

Claims (1)

[Claims] 1. A fluid pressure cylinder is constructed by connecting a required number of cylinder chambers in tandem, and pistons are fitted in the respective cylinder chambers, and a rod fixed to the pistons has a concentric multiaxial structure. Fluid pressure cylinder.