Koganei Corporation

Howa Machinery, Ltd.

Akiyoshi Horikawa

Mitsuo Noda

Hiroshi Yoshida

Naoki Minowa

Yuta Ohmura

Tsuyoshi Yonezawa

Yu Takebayashi

An object of the present invention is to provide a fluid pressure cylinder improved in assembling performance so as to easily fix a partition wall to a cylinder main body. A plurality of pistonsandare incorporated in a cylinder main body, axially aligned with each other, reciprocable in an axial direction, and respectively provided with piston rodsand. A partition wallis attached to the cylinder main bodyso as to form pressure chambersand. A stopper space is formed by an engagement grooveprovided to the partition walland a slitformed so as to extend in a transverse direction of the cylinder main body. A stopperis inserted in the stopper space in the transverse direction of the cylinder main bodyso as to fix the partition wallto the cylinder main body

Fluid pressure cylinder

A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit for absorbing an impact force without bending the reciprocating rod. The shock absorber has a hollow rod provided with a through hole. The hollow rod is mounted within an outer cylindrical body. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force toward one end portion side of the hollow rod is applied to the outer cylindrical body by a compression coil spring. An annular piston provided in the hollow rod partitions the accommodating space into two liquid chambers. When the impact force is applied to the hollow rod, the liquid flows from one liquid chamber to another liquid chamber through a gap, whereby a resistance force is applied to the hollow rod.

Shock absorber

A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod and an outer cylindrical body mounted axially movably relatively to and outside the hollow rod. An accommodating space is formed between the hollow rod and the outer cylindrical body. The hollow rod carries an annular piston, which partitions the accommodating space into two liquid chambers. A compression spring biases the outer cylindrical body toward one end of the hollow rod. When an impact forces the outer cylindrical body toward the other end of the hollow rod, liquid flows from one of the liquid chambers to the other through a gap, so that a resistance force is applied to the annular piston.

A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod provided with a through hole and an outer cylindrical body mounted outside the hollow rod so as to be movable axially relatively and attached to the reciprocating unit. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force in a direction of being relatively directed to one end portion side of the hollow rod is applied to the outer cylindrical body by a compression coil spring. An annular piston for partitioning an accommodating space into two liquid chambers is provided in the hollow rod. When the impact force is applied to the hollow rod so as to be slid to the hollow rod, the liquid flows from one liquid chamber to another liquid chamber through a gap, whereby a resistance force is applied to the annular piston.

A shock absorber is attached coaxially with a reciprocating rod driven by a reciprocating unit to prevent a bending moment from being applied to the reciprocating rod in absorbing an impact force. The shock absorber has a hollow rod and an outer cylindrical body mounted axially movably relatively to and outside the hollow rod. An accommodating space is formed between the hollow rod and the outer cylindrical body. A spring force in a direction of being relatively directed to one end portion side of the hollow rod is applied by a compression spring to the outer cylindrical body. The hollow rod is provided with an annular piston which partitions the accommodating space into two liquid chambers. When an impact force in a direction of being relatively directed to the other end side of the hollow rod is applied to the outer cylindrical body, liquid flows from one of the liquid chambers to the other through a gap, so that a resistance force is applied to the annular piston.

A pair of cylinder holesare formed in a cylinder tubein the axial direction, a slitis formed between these cylinder holes, and an iron plateis inserted in the slit covering the whole range of the movement of the pistonsin the cylinder holes. Spacersmade of a synthetic resin are interposed on both sides of the iron plateto reliably hold the iron platein the slit. The iron platedisposed between the cylinder holes works to decrease the repulsive force acting between the inner magnetsof the pistons and produce an attracting force between the iron plateand the inner magnets, and a contact surface pressure between the wear ringsof the pistonsand the wall surfaces of the cylinder holescan be adjusted to a suitable value.

Magnet type rodless cylinder

A pair of independent cylinder holesare formed in a cylinder tubeof a flat outer shape. When a pressurized fluid is alternately supplied into the cylinder tubethrough a portformed in an end cap, the internal pressure for operating the cylinders acts uniformly on the cylinder tubegreatly decreasing stress and deflection of the cylinder tube

Repulsive magnetic forces in the axial direction of cylinder tubes act between the rowsof inner magnets of pistonsaccommodated in two cylinder tubes, and the inner magnetsof the pistonscome to a halt being slightly deviated relative to the outer magnetsin the axial direction of the tube. Due to this deviation, a magnetic holding force Fc is produced between the inner and outer magnets. Since the magnetic holding force Fc is produced in a static state, a smooth movement can be attained from a static state suppressing the occurrence of a stick slip phenomenon at the start of movement as compared to the prior art, which does not produce the magnetic holding force in a static state.

A magnet type rodless cylinder provided with a slide magnetically coupled with a piston arranged in a cylinder tube and a slide able to move outside of the cylinder tube. The slide has a connection mount detachably attached to it. When attaching the connection mount, the position where the connection mount and an end cap strike/contact becomes the striking/contacting position of the piston. When using a rodless cylinder without a connection mount, the distance between the slide and an end cap when the piston is positioned at the striking/contacting position becomes longer than the striking/contacting distance due to the removal of the connection mount. Therefore, external dampers able to strike/contact the slide are detachably attached to the end caps at the slide sides. Due to this, regardless of the use or nonuse of a connection mount, the piston and slide can always stop at the striking/contacting position.

Rodless cylinder

The elastomer dampers are disposed at both ends of the actuator cylinder in order to stop the piston moving in the cylinder at its stroke ends. The elastomer damper includes a pair of the protruding portions which abut the piston at its stroke end. The protruding portion has an tapered shape in which the cross sectional area thereof gradually decreases from the base to the top. Therefore, when the piston abuts the protruding portions and compresses the protruding portions, the braking force exerting on the piston gradually increases without sudden change. Therefore, the piston decelerates smoothly at its stroke ends. Further, since the top surface of the protruding portion is formed as a flat plane and the top surface is connected to the tapered side surface of the protruding portion by a round surface, no stress concentration occurs at this portion. Therefore, cracks or breakage of the material do not occur in the top surface even after a long operating time of the actuating cylinder.

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Tokyo, Japan

Akiyoshi Horikawa