JPH0440011Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oscillating cylinder capable of outputting axial thrust and oscillating torque around an axis to a piston rod at any time.

[Prior Art] Conventionally, as such a swing cylinder, one having a structure shown in Japanese Patent Publication No. 51-32795 has already been proposed.

The general idea is that one end of the cylinder is fixed to a main body that houses a pinion and a rack that meshes with the pinion to generate rotational force. It has a structure in which a spline shaft, one end of which is fixed to a pinion, is inserted in the axial direction of a hollow piston rod that projects outward.

The thrust in the axial direction of the piston rod is obtained by alternately applying compressed air pressure through the fluid supply and discharge ports provided at both ends of the cylinder, and the rocking motion around the shaft is transmitted from the pinion via the spline shaft. Torque is output at any time.

[Problems to be solved by the invention] However, in the conventional swing cylinder as described above, the diameter of the piston rod into which the spline is inserted has to be relatively large in order to ensure strength, and the piston rod has a large diameter. There is a disadvantage that the dimensions such as the diameter and the outer diameter of the cylinder become large, and the part of the piston rod through which the spline is inserted must be hollowed out, making the structure complicated.

Furthermore, there is also the problem that the pressure receiving area of the piston is reduced by the cross-sectional area of the spline shaft inserted into the piston rod from the piston side, and the thrust force obtained by the piston rod is impaired.

Furthermore, since the piston and piston rod are rotated inside a cylinder fixed to a rectangular housing, there is a problem in that the swinging torque obtained in the piston rod is impaired due to frictional resistance between the piston and the cylinder.

Furthermore, the fluid supply and discharge ports for driving the pinion and the piston rod are separately provided in both the main body and the cylinder, which makes the piping connected from the outside complicated. There is also the problem.

The purpose of the present invention is to provide a swinging cylinder that is small in radial dimension, has a simple structure, and can efficiently generate thrust in the axial direction of the piston rod and swinging torque around the shaft. It's about doing.

Another object of the present invention is to provide a swing cylinder that can simplify connecting piping.

[Means for solving the problem] The swing cylinder of the present invention is provided in the main body,
A drive rack that reciprocates by the fluid pressure applied from the first and second fluid supply/discharge ports, a pinion that meshes with the drive rack, and a pinion whose one end is inserted into the main body and inserted in the internal axial direction. a cylinder that swings together with the pinion when engaged with one end thereof; and a piston that is housed in the cylinder so as to be movable in the axial direction and that separates first and second fluid chambers within the cylinder. a piston rod that protrudes through a closing member whose one end is connected to the piston and whose other end closes the other end of the cylinder; and a piston rod that is interposed between the piston rod and the cylinder to restrain displacement in the axial direction of the piston rod. a rocking displacement transmitting means for transmitting the rocking displacement of the cylinder to the piston rod, and a third fluid supply which is bored through the pinion in the axial direction and has a first fluid chamber in the main body. a first fluid passage communicating with the discharge port; a second annular fluid passage formed circumferentially at the insertion end of the cylinder into the main body and communicating with a fourth fluid supply/discharge port opened in the main body;
The third fluid passage is bored in the wall surface of the cylinder in the axial direction and communicates the second fluid passage with the second fluid chamber of the cylinder.

[Operation] According to the above-mentioned means, since the torque of the cylinder oscillated by the pinion is transmitted to the piston rod by the oscillation displacement transmission member, for example, the spline structure of the pinion is coaxially inserted into the piston rod. Compared to the conventional structure in which the piston rods and cylinders are joined together by means of joints, there is no need to make the outer diameter of the piston rod or cylinder larger than necessary for the purpose of ensuring strength, and the radial dimension of the cylinder is reduced. , there is no need to perform complicated machining on the inside of the piston rod, and the structure is simplified.

In addition, since the end face of the piston in the cylinder on the pinion side is effectively used as a pressure receiving area, the piston rod can efficiently generate a large thrust with relatively small fluid pressure, and the piston rod in the cylinder Since it rotates in synchronization with the cylinder, there is no loss of rocking torque due to sliding resistance in the circumferential direction between the piston and cylinder, and the rocking torque generated by the pinion can be effectively used to drive the piston rod.

Furthermore, in the part of the main body where the pinion is housed,
Not only the first and second fluid supply and discharge ports for driving the pinion, but also the third and fourth fluid supply and discharge ports for generating axial thrust in the piston rod are centrally opened. , the piping route externally connected to the first to fourth fluid supply/discharge ports can be simplified.

[Embodiment] FIG. 1 is a sectional view showing the main parts of a swing cylinder according to an embodiment of the present invention, and FIG. 2 is a sectional view of the portion indicated by the line - in FIG. 1.

Inside the block-shaped main body 1, there are a plurality of rack cylinders 2 formed in parallel at predetermined intervals.
A rack cylinder 3 is provided, and both ends of the rack cylinders 2 and 3 are closed by lids 4 and 5.

Inside the plurality of rack cylinders 2 and 3,
For example, a driving rack 6 and a driven rack 7 each having teeth formed on the side surface of a cylindrical member are housed so as to be slidable in the axial direction, and are located between the rack cylinders 2 and 3 in the center of the main body 1. A pinion 9 which is provided in the
are engaged at the same time.

Rack cylinders 2 are installed at both ends of the drive rack 6.
A rack piston 10 and a rack piston 11 that are slidably moved in the axial direction inside the rack cylinder 2 are respectively fixed, and a fluid chamber is formed between the rack piston 10 and the lid body 4 inside the rack cylinder 2. R, and the fluid chamber L formed between the rack piston 11 and the lid body 5, by alternately applying fluid pressure from the outside through the fluid supply/discharge port 12 or the fluid supply/discharge port 13.
A thrust force is generated to reciprocate the pinion shaft 8 through the pinion 9 meshed with the drive rack 6.
The structure is such that swing torque can be obtained.

On the other hand, the driven rack 7, which is engaged with the pinion 9 together with the drive rack 6, is reciprocated following the rocking motion of the pinion 9 generated by the reciprocating motion of the drive rack 6, and The process end is regulated so that the process is shorter than the drive latch 6 by abutting both ends of the angle adjustment screw 14 and the angle adjustment screw 15, which are respectively screwed on. By appropriately rotating the pinions 14 and 15 to change the position of contact with the driven rack 7, the swing angle of the pinion 9 is adjusted, and the occurrence of backlash at the swing end is prevented.

A pinion shaft 8 is integrally formed, and a ball bearing 16 and a ball bearing 17 are provided on both sides of the pinion 9 housed inside the main body 1 between the pinion shaft 8 and the main body 1,
The pinion shaft 8 is configured to smoothly swing.

In this case, the end of the pinion shaft 8 protruding outside the main body 1 closes the insertion end of the cylinder 18, one end of which is rotatably inserted into the main body 1, and is connected to the cylinder 18 via the set screw 8a. The cylinder 18 is engaged with the pinion shaft 8, and the cylinder 18 is structured to swing together with the pinion shaft 8.

Furthermore, inside the cylinder 18, a piston 19 is slidably positioned inside the cylinder 18.
A piston rod 21 is housed, the piston rod 21 being connected to one end and having the other end projecting to the outside of the cylinder 18 through the closing member 20. A fluid chamber A and a fluid chamber B are formed between the pinion shaft 19 and the pinion shaft 8, respectively.

A set screw 2 is attached to the outer end of the piston rod 21.
The support member 22 is locked via the piston rod 2a, and the piston rod 21 is attached to the support member 22.
A guide bar 23 is provided parallel to the cylinder 18 and has one end slidably inserted into the wall surface of the cylinder 18 in the axial direction.
The other end is engaged and the piston rod 21
without restricting the axial displacement of cylinder 1.
The piston rod 21 and the cylinder 18 are structured to form a sliding pair so that the swinging motion of the piston rod 8 is transmitted to the piston rod 21.

A fluid passage 8b is formed inside the pinion shaft 8 so as to penetrate in the axial direction and communicate with the fluid chamber B at one end and communicate with the fluid supply/discharge port 24 formed in the main body 1 at the other end. The fluid supply/discharge port 24
Fluid pressure applied from the outside through the fluid passage 8
The piston rod 21 is configured to generate a thrust force in the direction of protruding from the cylinder 18 by acting on the fluid chamber B through the piston rod b.

A fluid passage 18a is formed in the wall surface of the cylinder 18, and one end of the fluid passage 18a is communicated with the fluid chamber A, and the other end is completely connected to the outer periphery of the insertion end of the cylinder 18 into the main body 1. An annular fluid passage 18b with a concave cross section carved around the circumference
The cylinder 18 is connected to the fluid supply/discharge port 25 through the cylinder 18 regardless of the rotational position of the cylinder 18 with respect to the main body 1 .
By applying fluid pressure to the fluid chamber A from the outside through the fluid supply/discharge port 25, the annular fluid passage 18b, and further the fluid passage 18a, a thrust in the direction of drawing the piston rod 21 into the inside of the cylinder 18 is generated. It is something that

The main body 1 is provided with a plurality of mounting holes 26 passing through the main body 1, and is fixed to a predetermined mounting device (not shown) by inserting mounting bolts (not shown) or the like therethrough. .

The operation of this embodiment will be explained below.

First, the main body 1 is attached to a device (not shown) by bolts inserted through the mounting holes 26, and the fluid supply/discharge ports 12, 13 formed in the main body 1 are attached to a device (not shown).
The fluid supply/discharge ports 24 and 25 are connected to a predetermined fluid pressure source (not shown), and the piston rod 21 is connected to a load (not shown).

When fluid pressure such as compressed air is applied to the fluid chamber B inside the cylinder 18 through the fluid supply/discharge port 24 and the fluid passage 8b inside the pinion shaft 8, the piston rod 21 protrudes from the cylinder 18. A predetermined thrust is applied to a load (not shown) connected to the piston rod 21 in the axial direction.

Conversely, the fluid supply/discharge port 25 and the annular fluid passage 18
b. When fluid pressure such as compressed air is applied to the fluid chamber A through the fluid passage 18a, the piston rod 2
1 is displaced in the direction of being drawn into the inside of the cylinder 18, and a thrust force in the direction of approaching the main body 1 is applied to a load (not shown).

On the other hand, fluid supply/discharge ports 12 and 1 formed in the main body 1
3 to the fluid chamber R inside the rack cylinder 2;
When fluid pressure such as compressed air is applied to L, a thrust is generated in the drive rack 6 in the direction of approaching the lids 5 and 4, and the pinion shaft 8 is generated through the pinion 9 meshed with the drive rack 6. In this case, a counterclockwise (clockwise) swinging torque is generated in FIG. A dynamic torque is transmitted, and the piston rod 21 is oscillated together with the cylinder 18 without being restricted from axial displacement, and a oscillating torque in a predetermined direction is applied to a load (not shown).

Further, the process end of the driven rack 7, which is reciprocated following the rocking of the pinion 9, is attached to the angle adjusting screw 14.
Since the piston rod 21 is regulated by contacting the piston rods 15 and 15, backlash at the swinging end of the piston rod 21 is prevented, and the swinging angle of the piston rod 21 can be easily adjusted from the outside.

In this way, the piston rod 21 is provided with an axial thrust and a swinging torque about the axis, respectively or simultaneously, and the load connected to the piston rod 21 is provided with a rotational motion and a linear motion at any time. It is possible to perform complex movements in combination with other movements.

Here, in this embodiment, a pinion 9 is engaged with a drive rack 6 provided inside the main body 1.
The end of the pinion shaft 8, which is integrally formed and obtains rocking torque by the reciprocating motion of the drive rack 6, is
It is engaged with the insertion end of the cylinder 18 rotatably inserted into the main body 1 via a set screw 8a, and further,
The piston rod 21 is configured to swing together with the cylinder 18 without being restricted from axial displacement via the guide bar 23 and the support member 22, so that the piston rod 21 forms a sliding pair with the cylinder 18. As a result, thrust in the axial direction and swinging torque around the shaft are outputted to the piston rod 21 at any time.

For this reason, for example, when forming a spline on the pinion shaft 8 and inserting it in the internal axial direction of the piston rod 21 to transmit rocking torque to the piston rod 21, the diameter of the piston rod 21 and the cylinder 18 is required. There is no need to make the piston rod 21 or cylinder 18 larger, and the diameters of the piston rod 21 and the cylinder 18 can be reduced, and the dimensions of the entire swing cylinder can be reduced.

Further, it is not necessary to perform processing such as making the inside of the piston rod 21 hollow or carving teeth on the inner periphery of the hollow portion for meshing with a spline, thereby simplifying the structure.

Further, the swinging torque of the pinion 9 is transmitted from the cylinder 18 to the piston rod 2 via the guide bar 23.
1, the pressure receiving area of the fluid chamber B side of the piston 19 connected to one end of the piston rod 21 does not decrease due to the connection between the piston rod 21 and the pinion shaft 8, for example, and the pressure of the piston 19 is It is possible to effectively utilize the entire end face as a pressure receiving surface to obtain a relatively large thrust on the piston rod 21, and since both the cylinder 18 and the piston rod 21 rotate synchronously, the circumferential direction of the cylinder 18 and piston 19 There is no loss of rocking torque due to the sliding resistance of the pinion 9.
The torque generated by the piston rod 21 can be effectively utilized for the swinging motion of the piston rod 21.

Furthermore, the fluid supply and discharge ports 12 and 13 that generate a swinging torque in the piston rod 21 and the fluid supply and discharge ports 24 and 25 that generate an axial thrust are formed concentrated in the main body 1, so that the swinging cylinder It is possible to simplify the piping connected to the

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

[Effects of the invention] (1) A drive rack provided within the main body and reciprocated by fluid pressure acting from the first and second fluid supply/discharge ports, and a pinion meshed with the drive rack; a cylinder whose one end is inserted into the main body and is engaged with one end of the pinion inserted in the internal axial direction so as to be swung together with the pinion; a piston that separates first and second fluid chambers within the cylinder; and a piston rod that has one end connected to the piston and whose other end projects through a closing member that closes the other end of the cylinder. , a rocking displacement transmitting means interposed between the piston rod and the cylinder and transmitting rocking displacement of the cylinder to the piston rod without restricting the axial displacement of the piston rod; a first fluid passage that is drilled through in the axial direction and communicates the first fluid chamber with a third fluid supply/discharge port provided in the main body; an annular second fluid passage formed in the direction and communicating with a fourth fluid supply/discharge port opened in the main body; and an annular second fluid passage formed in the wall surface of the cylinder in the axial direction Since the structure includes a third fluid passage communicating with the second fluid chamber of the cylinder,
For example, compared to the case where the swinging torque of the pinion is transmitted to the piston rod by inserting a spline shaft, one end of which is connected to the pinion, in the internal axial direction of the piston rod, it is necessary to There is no need to increase the diameter more than necessary, the dimensions are reduced, and there is no need to perform complicated machining on the inside of the piston rod, simplifying the structure.

In addition, the pressure receiving area of the piston connected to one end of the piston rod is not impaired due to, for example, connection with a pinion, and fluid pressure can be effectively used to obtain a large thrust on the piston rod. Since the cylinder, piston, and piston rod all rotate synchronously, there is no loss of rocking torque due to sliding resistance in the circumferential direction between the piston and cylinder, and pinion torque is effectively used to drive the piston rod. be able to.

Furthermore, the first and second fluid supply/discharge ports that generate rocking torque in the piston rod, and the third and fourth fluid supply/discharge ports that generate axial thrust are formed centrally in the main body. Therefore, the piping connected to the swing cylinder from the outside can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a main part of a swing cylinder according to an embodiment of the present invention, and FIG. 2 is a sectional view of the portion indicated by a line - in FIG. 1... Main body, 2, 3... Rack cylinder, 4,
5... Lid body, 6... Drive rack, 7... Driven rack, 8... Pinion shaft, 8a... Set screw, 8b
...Fluid passage (first fluid passage), 9... Pinion, 10, 11... Rack piston, 12... Fluid supply/discharge port (first fluid supply/discharge port), 13... Fluid supply/discharge port ( 2nd fluid supply/discharge port), 14, 15... Angle adjustment screw, 16, 17... Ball bearing, 18... Cylinder, 18a... Fluid passage (third fluid passage),
18b... annular fluid passage (second fluid passage), 1
9... Piston, 20... Closing member, 21... Piston rod, 22... Support member, 22a... Set screw, 23... Guide bar, 24... Fluid supply/discharge port (third fluid supply/discharge port) , 25...Fluid supply/discharge port (fourth fluid supply/discharge port), 26...Mounting hole, A...Fluid chamber (second fluid chamber), B...Fluid chamber (first fluid chamber), R, L...Fluid chamber.

Claims (1)

[Claims for Utility Model Registration] (1) A drive rack provided in the main body and reciprocated by fluid pressure acting from first and second fluid supply/discharge ports, and a drive rack meshed with the drive rack. a pinion, a cylinder whose one end is inserted into the main body and which is engaged with one end of the pinion that is inserted in the internal axial direction and thereby oscillates together with the pinion; and which moves into the cylinder in the axial direction. a piston that is freely housed and separates first and second fluid chambers within the cylinder; and a closing member that has one end connected to the piston and the other end that closes the other end of the cylinder and protrudes through it. a piston rod, a rocking displacement transmitting means interposed between the piston rod and the cylinder and transmitting rocking displacement of the cylinder to the piston rod without restricting axial displacement of the piston rod, and the pinion. a first fluid passage axially penetrating through the interior of the main body and communicating the first fluid chamber with a third fluid supply/discharge port provided in the main body; and insertion of the cylinder into the main body. an annular second fluid passage formed in the circumferential direction at the end and communicating with a fourth fluid supply/discharge port opened in the main body; A rocking cylinder comprising a third fluid passage that communicates a fluid passage with the second fluid chamber of the cylinder. (2) A utility model characterized in that the rocking displacement transmission means comprises a polygonal through hole bored in the closing member, and the piston rod inserted into the through hole and having a polygonal cross section. A swing cylinder according to registered claim 1. (3) The rocking displacement transmission means is provided parallel to the piston rod with a support member engaged with the outer end of the piston rod, and one end is slidably inserted into the wall surface of the cylinder,
The swing cylinder according to claim 1, which is a registered utility model, and further comprises a guide bar whose other end is engaged with the support member. (4) A driven rack that reciprocates following the swinging of the pinion is engaged with the pinion, and by regulating the process end of the driven rack, the pinion swings through the cylinder. The swinging cylinder according to claim 1, wherein the swinging angle of the piston rod is adjusted.