JP2645531B2 - Fluid pressure cylinder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure cylinder in which a driven member is connected to a piston rod protruding from one end surface of a cylinder tube so as to reciprocate. Prevents rotation around the axis of the piston rod, and
The present invention relates to a fluid pressure cylinder in which a driven member is operated by fluid pressure.

2. Description of the Related Art In a hydraulic cylinder, as one method for preventing a driven member connected to a piston rod protruding from a through hole at one end face of a cylinder tube from rotating around the axis of the piston rod, a conventional cylinder tube is used. Means have been used in which two piston rods, which are integrally connected with protruding ends thereof, are provided in parallel.

Problems to be Solved by the Invention However, since the piston rod has low rigidity due to its circular solid cross section, bending or twisting occurs when a load or rotational force acts in the lateral direction in a state where the protruding length is long. It is unavoidable that the driven member swings or rotates in a direction perpendicular to the piston rod. For this reason, the driven member cannot be reciprocated accurately along a predetermined path while keeping the driven member in a predetermined posture, and the positioning accuracy of the driven member when the movement is stopped is low. When the members are operated by fluid pressure, there is a problem that accurate operation is difficult.

Means for Solving the Problems According to the present invention, as a means for solving the above-mentioned problems, a cylinder tube having a rectangular cross section protrudes from a through hole at one end face thereof and reciprocates with reciprocation of a piston by the action of fluid pressure. The protruding end of the piston rod is connected to a connecting portion of a slider having a U-shaped cross section having a connecting portion with the driven member at the front end, and the cylinder tube and the corresponding surfaces on both sides of the slider are tightly and in the reciprocating direction of the piston rod. A guide portion that freely fits only in relative movement in a direction parallel to the piston is provided, one end of the supply pipe parallel to the piston rod is fixed to the connection portion, and the other end of the supply pipe is provided in a supply hole formed in the cylinder tube. The air supply path is formed by inserting the air-tight part freely and reciprocally, and one end of the air supply path is used as a pressurized air supply source, and the other end is a driven member of the connection part Are connected to a supply port that matches the port.

Action and Effect of the Invention The present invention has the above-described structure, and when the piston rod is moved forward and backward by reciprocating movement of the piston by the action of fluid pressure,
Due to the fitting of the guide portion provided on the corresponding surface of the slider and the cylinder tube, the slider relatively moves with respect to the cylinder tube without rotation around the piston rod,
The driven member connected to the slider is reciprocated without rotating around the axis of the piston rod.

Here, even when a lateral load is applied from the side in a state where the piston rod protrudes largely from the through hole, the inclination with respect to the moving direction of the slider is caused by the tight fit between the cylinder tube and the guide portion of the slider. And rattling are prevented. Also. By making the slider have a rigid cross section, it is possible to prevent bending and twisting.

Therefore, the driven member can be reciprocated accurately without shifting from a predetermined path while maintaining the predetermined position, and when the movement is stopped, the position of the driven member can be determined with high accuracy. In particular, when the driven member is operated by the fluid pressure, there is an effect that the driven member can be operated accurately.

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

The fluid pressure cylinder B of the first embodiment has a guide groove 31 formed on the left and right inner surfaces of the slider 30 and a guide groove 34 formed on the left and right outer surfaces of the cylinder tube 33, and steel balls 32 held on the slider 30 side. Are adapted to be fitted freely so that the slider 30 is prevented from rotating around the axis of the piston rod 35.

In manufacturing the cylinder tube 33 and the slider 30 of the fluid pressure cylinder B, a method suitable for mass production, in which synthetic resin mixed with metal powder is injection-molded and sintered, is used. The wear resistance of the guide groove 34 of the cylinder tube 33 is enhanced by partial quenching.

A connecting plate (corresponding to a connecting portion which is a component of the present invention) 36 is fixed to the front surface of the slider 30 having a gate-shaped cross section. The connecting plate 36 has a cylinder tube 33 of a piston rod 35. The tip protruding from the through hole 37 is integrally connected by fitting the flange 38 into the mounting groove 39 of the connecting plate 36. A fluid pressure actuator (corresponding to a driven member which is a component of the present invention) 40 such as a chuck which is operated by the supply of pressurized air is attached to the front surface of the connecting plate 36. I have.

Cylinder tube of fluid pressure cylinder B of the first embodiment
33 has a plurality of supply holes 41 formed in parallel with the advancing and retreating direction of the piston rod 35, while a connecting plate on the slider 30 side is formed.
The front ends of a plurality of supply pipes 42 whose axes are aligned with the supply holes 41 are fixed to 36. Each supply pipe 42
Guide cap 43 fixed to the front of cylinder tube 33
By passing through the guide hole 44 of the
Each of them is inserted freely into the corresponding supply hole 41 so as to advance and retreat.

A plurality of air supply paths 45 parallel to the piston rod 35 are formed by the supply holes 41 and the supply pipes 42. The front end of each air supply passage 45 is formed as a supply port 46 that opens to the front surface of the connecting plate 36 and matches a port (not shown) of the fluid pressure actuator 40, and the rear end of each air supply passage 45 is a cylinder. The connection port 47 opens to the rear end face of the tube 33 and is connected to a pressurized air supply source (not shown) via a switching valve.

Further, a pair of mounting portions 48a, 48b projecting downward from the lower edge are formed at both front and rear end positions of the left side plate portion of the slider 30, and a screw portion is formed on an outer periphery on a rear surface of the front mounting portion 48a. Stopper 49a with shock absorber was
In the state protruding rearward, and is screwed so that the protrusion length can be adjusted by rotation, on the front surface of the rear mounting portion 48b, a stopper 49b also having a threaded portion on the outer periphery,
It is screwed in such a manner as to project in the forward direction and to adjust the projection length by rotation. On the left side surface of the cylinder tube 33, a stopper block 50 having both front and rear surfaces corresponding to stoppers 49a and 49b is fixed.

Further, a mounting groove 51 is formed on the right side surface of the cylinder tube 33 in parallel with the reciprocating direction of the piston rod 35,
A magnetic sensor 54 that detects the position of the piston 52 by reacting to the magnetism of the permanent magnet 53 externally fitted to the piston 52 is fitted in the mounting groove 51 so that the mounting position in the front-rear direction can be adjusted.

The fluid pressure cylinder B of the first embodiment has the above configuration,
The rotation of the slider 30 around the piston rod 35 by fitting the steel ball 32 held on the slider 30 side into the two guide grooves 31 and 34,
Since the twisting and bending are prevented, the displacement of the movement path of the fluid pressure actuator 40, the change in the posture during the movement, and the deviation between the stop position and the posture when the movement is stopped are extremely small.

While the fluid pressure actuator 40 moves back and forth, each air supply passage 45 expands and contracts as the supply pipe 42 advances and retreats with respect to the supply hole 41. The fluid pressure actuator 40 operates by the supply and discharge of pressurized air performed through these air supply passages 45.

As described above, the supply of the pressurized air to the hydraulic actuator 40 is performed by the air supply passage 45 provided in the cylinder tube 33 and the slider 30. Therefore, it is necessary to directly connect an air hose to the hydraulic actuator 40. There is no. Accordingly, there is no possibility that the hose is bent due to the movement of the fluid pressure actuator 40 and interferes with or catches on the surrounding devices.

The forward and backward movements of the fluid pressure actuator 40 are stopped when the stoppers 49a and 49b abut against the stopper block 50. Performed by

Further, during the movement of the fluid pressure actuator 40, it is possible to detect that the piston 52 has reached a predetermined position by the magnetic sensor 54 attached to an appropriate position of the attachment groove 51 of the cylinder tube 33. When the fluid pressure actuator 40 reaches a desired position, the movement thereof can be stopped.

FIG. 4 shows a hydraulic cylinder C according to a second embodiment of the present invention.

In the second embodiment, the slider 55 is provided with a piston rod 56.
Means for preventing rotation around will be described.

Sliding grooves 58, 58 having a wedge-shaped cross section parallel to the piston rod 56 are formed on both left and right outer surfaces of the cylinder tube 57. On the other hand, sliding grooves 58
In addition, mounting grooves 59 having a rectangular cross section are formed so as to correspond to the above, and the front and rear end portions are not opened at the front and rear end surfaces of the cylinder tube 57. A fitting body 60 that is elongated in the front-rear direction is fitted into these mounting grooves 59 so as to be immovable in the front-rear direction and move only in the direction of contact and separation with respect to the sliding groove 58 of the cylinder tube 57. The fitting body 60 is formed with a ridge 61 projecting toward the cylinder tube 57 and having a wedge-shaped cross section inclined at the same angle as the sliding groove 58. And
The fitting body 60 has a screw 62 whose outer surface is screwed to the slider 55.
As a result, the protrusion 61 is held by the slider 55 in a state in which only the slide in the front-rear direction is freely fitted in the slide groove 58 by being pressed toward the cylinder tube 57 side.

The fluid pressure cylinder C of the second embodiment having the above-described configuration is
When the piston rod 56 advances and retreats, the fitting body 60 of the slider 55
The ridge 61 slides only in the front-rear direction without moving up, down, left and right along the sliding groove 58 of the cylinder tube 57. As a result, the rotation of the slider 55 around the piston rod 56 is prevented, the movement path, stop position, and posture of the driven member (not shown) are extremely slightly suppressed, and the fluid pressure cylinder C operates with high accuracy.

When the surface of the ridge 61 of the fitting body 60 is worn by sliding contact with the sliding groove 58, the screw 62 is tightened to push the fitting body 60 toward the cylinder tube 57, so that the ridge 61 is formed. It is possible to avoid rattling between the sliding groove 61 and the sliding groove 58.

In the fluid pressure cylinder C of the second embodiment, a ridge 61 is provided on the slider 55 side so as to fit into the sliding groove 58 formed in the cylinder tube 57. May be provided on the cylinder tube side and fitted into a guide groove formed in the slider.

FIG. 5 shows a fluid pressure cylinder D according to a third embodiment of the present invention.

In the third embodiment, a pair of left and right precision ball slides 64, 64 are used to prevent the slider 63 from rotating. The precision ball slide 64 has an elongated movable guide 65a having a U-shaped cross section, and a rectangular cross section having a rectangular cross section in which only relative movement in the length direction is freely fitted via a steel ball 66 into a concave portion of the movable guide 65a. It comprises an elongated movable guide 65b. Each precision ball slide 64 has a mounting groove formed on the outer surface of a cylinder tube 68 by a movable guide 65a having a U-shaped cross section in a state in which the relative movement direction of both movable guides 65a and 65b is parallel to the piston rod 67. Inside 69, movable guides 65b having a rectangular cross section are fixed to the inner surface of the slider 63 by screws 70, respectively.

A mounting groove 71 is formed in a portion of the cylinder tube 68 protruding outward from a lower portion on the lower right outer surface, in parallel with the piston rod 67, and a magnetic sensor 72 is mounted at a predetermined position of the mounting groove 71. On the other hand, a permanent magnet 73 is embedded at a lower position of the right side plate portion of the slider 63, and the permanent magnet 73 moves near the mounting groove 71 as the slider 63 moves.

When the slider 63 moves back and forth in accordance with the reciprocation of the piston rod 67, the slider 63 moves up, down, left, and right by fitting the two movable guides 65a, 65b of the pair of left and right precision ball slides 64, 64. It moves only in the front-back direction without any movement. Thus, the rotation of the slider 63 around the piston rod 67 is prevented, and the movement path, the stop position, and the posture of the driven member (not shown) are very slightly suppressed.

In the third embodiment, the permanent magnet 73 is buried in the slider 63 so as to pass near the magnetic sensor 72, so that the permanent magnet 73 and the magnetic sensor There is an advantage that the distance to 72 can be shortened and detection can be performed with high accuracy.

Next, the fluid pressure cylinder E of the fourth embodiment of the present invention
Explanation will be given based on FIG. 7 and FIG.

In the fourth embodiment, a miniature air-type linear way 75 is used as a means for preventing the rotation of the slider 74. The miniature air-type linear way 75 has a long movable guide body 76a having a rectangular cross section, and a short movable guide body having a U-shaped cross section arranged so as to straddle the movable guide body 76a.
76b, the two movable guides 76a and 76b are provided with a plurality of steel balls 77 rotatably held on the left and right inner surfaces of the movable guide 76b having a U-shaped cross section, thereby enabling the lengthwise direction Fitted so that only relative movement is possible.

The miniature air type linear way 75 with this configuration is
With the relative movement direction of the two movable guides 76a and 76b parallel to the piston rod 83, the movable guide 76a having a rectangular cross section
Is fixed by a bolt 80 to a concave portion 79 formed on the upper surface of the cylinder tube 78 over substantially the entire length thereof, and a movable guide 76b having a U-shaped cross section is formed in a concave portion formed on the lower surface of the upper plate portion of the slider 74. It is fixed to the rear end position of 81 by a bolt 82.

The slider 74 has a plurality of supply holes 84 formed at both front and rear end surfaces thereof in parallel with the piston rod 83. A pipe block 85 is fixed to the rear end of the cylinder tube 78 so as to correspond to the rear end face of the slider 74. The pipe block 85 has a plurality of supply holes 84 whose axes are aligned with the supply holes 84. The rear end of the supply pipe 86 is fixed. Each supply pipe 86 penetrates a guide hole 88 of a guide cap 87 fixed to the rear end face of the slider 74 in a state where the airtightness is maintained, so that each of the supply pipes 86 is freely inserted into the corresponding supply hole 84 so as to advance and retreat.

A plurality of air supply passages 89 parallel to the piston rod 83 are formed by the supply holes 84 and the supply pipes 86. The front end of each air supply passage 89 is open to the front surface of a connecting plate 90 fixed to the front end of the slider 74 and serves as a supply port 91 that matches a port of a fluid pressure actuator (not shown). The end portion is open to the rear surface of the piping block 85 and forms a connection port 92 connected to a pressurized air supply source (not shown) via a switching valve.

Further, as shown in FIG. 7, on the lower surface of the cylinder tube 78, a mounting groove 93 for mounting the hydraulic cylinder E to a mounting member such as a bracket (not shown) is provided over the entire length in the length direction of the cylinder tube 78. It is formed throughout.

The fluid pressure cylinder E of the fourth embodiment has the above configuration,
As the piston rod 83 advances and retreats, the slider 74 moves back and forth without rotating around the piston rod 83 due to the engagement of the two movable guides 76a and 76b of the miniature air type linear way 75. Therefore, the fluid pressure actuator is
It moves in the front-rear direction while maintaining a predetermined route and a predetermined posture with high accuracy.

Also, while the fluid pressure actuator moves back and forth,
The operation is performed by pressurized air supplied through the air supply passage 89.

[Brief description of the drawings]

The accompanying drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view of the first embodiment, FIG. 2 is a longitudinal sectional view thereof, FIG. FIG. 5 is a partially cutaway front view of the second embodiment, FIG. 5 is a partially cutaway front view of the third embodiment, FIG. 6 is a longitudinal sectional view of the fourth embodiment, and FIG. It is a partially notched front view. B, C, D, E: fluid pressure cylinder, 33, 57, 68, 78: cylinder tube, 5, 52: piston, 37: through hole, 35, 56,
67, 83: Piston rod, 30, 55, 63, 74: Slider, 3
1, 34: guide groove, 32: steel ball (sphere), 36, 90: connecting plate (connecting part), 40: fluid pressure actuator (driven member), 41, 8
4: Supply hole, 42, 86: Supply pipe, 45, 89: Air supply path, 4
6, 91: supply port, 47, 92: connection port, 58: sliding groove, 6
1: Ridge, 65a, 65b, 76a, 76b: Movable guide

Claims (1)

(57) [Claims] A piston rod protruding from a through hole at one end face of a cylinder tube having a rectangular cross section and reciprocating with the movement of a piston by the action of fluid pressure. The slider has a U-shaped cross section, and the connecting portions of the slider and the cylinder tube and the corresponding surfaces on both sides of the slider can be freely moved tightly and only in a relative movement in a direction parallel to the reciprocating direction of the piston rod. A guide part for fitting is provided, one end of a supply pipe parallel to the piston rod is fixed to the connection part, and the other end of the supply pipe is hermetically and freely inserted into a supply hole formed in the cylinder tube. To form an air supply path, one end of the air supply path is aligned with the pressurized air supply source, and the other end is aligned with the port of the driven member of the connecting portion. Fluid pressure cylinder, characterized in that in communication with the port.