JP2513839Y2 - Rotarian Actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotary actuator, and more particularly to a technique effective when applied to a rack-and-pinion type rotary actuator.

[Conventional technology]

The rack-and-pinion type rotary actuator is usually a rack provided axially slidably in the cylinder body, and a piston in a fluid pressure chamber formed in the cylinder body at both ends of the rack, respectively. And a pinion that meshes with the rack, and the swing shaft is fixed to the pinion. The rocking shaft is rocked in the forward rotation direction and the reverse rotation direction via the rack and the pinion by alternately applying fluid pressure to the pistons located on both sides of the rack. In some cases, two racks are engaged with the pinion in order to increase the driving force with respect to the pinion.

[Problems to be solved by the device]

However, the swing shaft of the conventional rotary actuator only swings between swing ends in the forward rotation direction and the reverse rotation direction, and it is difficult to set the swing stroke and its neutral position.

For this reason, the conventional rotary actuator is not suitable for the usage form in which the swing shaft is set to the neutral position of the swing stroke and the swing motion is performed from this neutral position, and the wide range of use of the rotary actuator is hindered. There is.

An object of the present invention is to provide a rotary actuator capable of diversifying the swing motion of the swing shaft by enabling the swing shaft to be positioned at the neutral position of the swing stroke.

[Means for solving the problem]

The rotary actuator of the present invention rotatably supports a pinion integral with a swing shaft, and a pair of racks respectively engaged with the pinion and parallel to each other is axially slidably supported on a cylinder body. A piston is located at one end of each rack and slidably provided in a fluid pressure chamber formed in the cylinder body in each axial direction. This piston swings the pinion in the forward and reverse directions. A pair of neutral position setting members are located on the other end side of each rack. The neutral position setting member is provided in a cylinder chamber formed in the cylinder body and abuts and slides on the rack between the forward end position and the backward end position distant from the forward end position to move the forward end end. When the rack abutting at the position slides in the direction opposite to the backward end position, the rack stops at the forward end position and separates from the rack. A spring for urging a spring force toward the forward end position of each neutral position setting member is provided in each cylinder chamber. When each neutral position setting member is restricted to the forward end position by the pair of first stoppers, the swing shaft is set to the neutral position. Further, the neutral position setting member pushed by the corresponding rack by driving one of the pistons contacts the second stopper at the retracted end position.

[Action]

According to the rotary actuator described above, when one piston is slid in the axial direction by the action of fluid pressure and the rack is slid in the axial direction, the swing shaft is rotated by the rotation of the pinion meshed with the rack. It is swung in one direction. On the other hand, when the other piston slides and the rack slides in the axial direction, the pinion rotates in the opposite direction and the swing shaft swings in the other direction.

Then, in these cases, when the action of the fluid pressure is released, the neutral position setting member provided on the other end side of the rack and provided in each cylinder chamber abuts the first stopper by the urging means. Returned to position. At this time, since the neutral position setting members are in contact with the rack, the neutral position setting member pushes the rack back to the forward end position of the rack, whereby the rack is integrally provided with the pinion engaged with the rack. The shaft will be set to the neutral position of the swing stroke.

As described above, according to the rotary actuator of the present invention, the swing shaft can be set to the neutral position of the swing stroke, and the swing motion can be performed in the forward and reverse directions from the neutral position. It is possible to diversify the swinging motion.

[Embodiment 1] FIG. 1 is a sectional view showing a rotary actuator according to an embodiment of the present invention, and FIG. 2 is a sectional view for explaining an operating state of the rotary actuator of FIG.

A pinion 13 is rotatably supported by the cylinder body 1 of the rotary actuator, and a swing shaft 14 is integrated with the pinion 13. In the cylinder body 1, two guide holes 4c, 5c are provided on both sides of the pinion 13.
Two racks 11 and 12 are supported in pairs in the respective guide holes 4c and 5c so as to be slidable in the axial direction.

At one end of the cylinder body 1, each rack 11,1
The fluid pressure chambers 4 and 5 are formed at one end side of the piston 2 and the pistons 15 and 16 are provided in the fluid pressure chambers 4 and 5 as a pair so as to be slidable in the axial direction. ing. In addition,
On the outer circumference of each piston 15,16, seal members 15a, 1
6a is provided. Each of the fluid pressure chambers 4 and 5 is closed by a cover 3 attached to one end surface of the cylinder body 1, and pistons 15 and 16 are provided inside the rack 1 respectively.
It incorporates springs 17,18 for pressing against 1,12.

Therefore, when a fluid such as compressed air is supplied into the fluid pressure chamber 4, the rack 11 moves leftward in the figure and the pinion 13 rotates leftward, and when the fluid is supplied into the fluid pressure chamber 5, the rack 12 moves. Moves to the left, the pinion 13 rotates to the right, and the pinion 13 swings in the forward and reverse directions.

At the other end of the cylinder body 1, each rack 11,1
Cylinder chambers 4a and 5a are formed at the other end side of 2, and neutral position setting members 6 and 7 are slidably provided in pairs in the respective cylinder chambers 4a and 5a. The respective neutral position setting members 6 and 7 are in contact with the other end surfaces of the racks 11 and 12.

The respective cylinder chambers 4a, 5a are closed by a cover 2 attached to the other end surface of the cylinder body 1, and the neutral position setting members 6, 7 are provided by springs 8, 9 provided in the respective cylinder chambers 4a, 5a. The spring forces are applied to the racks 11 and 12, respectively. The cylinder chambers 4a, 5a are communicated to the outside by the breather ports 1a, 1b, and the biasing forces of the springs 17, 18 are set to be smaller than the biasing forces of the springs 8, 9.

A stroke adjusting member 10a protruding into the cylinder chamber 4a is screwed into the screw hole 2a formed in the cover 2, and a stroke adjusting member 10b protruding into the cylinder chamber 5a is screwed into the screw hole 2b formed in the cover 2. It is screwed.

The neutral position setting members 6 and 7 are the cylinder chambers 4a and 5a, respectively.
The first stopper surface (first stopper) S1 located on the radial end surface of the rack 11 and the forward end position for setting the racks 11 and 12 to the neutral position and the second stopper surface (second stopper surface) apart from the forward end position. ) Stroke adjusting members 10a, 10 having S2
It is designed to slide between the retracted end position where it abuts b.

The pressurizing sides 4b, 5b of the fluid pressure chambers 4, 5 are connected to the supply / discharge ports 3a, 3b opened in the cover 3, respectively, and the supply / discharge ports 3a, 3b include the 3-port solenoid valves 19, 20. It is connected via a fluid pressure source 21 such as compressed air. The three-port solenoid valves 19 and 20 are controlled by signals from a control circuit (not shown).

In the state shown in FIG. 1, by supplying fluid pressure such as compressed air to the pressurizing side 4b through the supply / discharge port 3a and acting the fluid pressure on the piston 15, the piston 15 and the rack 1
1, the neutral position setting member 6 is moved to the cover 2 side against the biasing force of the spring 8, and the neutral position setting member 6 at the forward end position is
As shown in FIG. 2, the stroke adjusting member 10a moves backward until it comes into contact with the second stopper surface S2 on the right end surface.

At this time, as the rack 11 moves, the pinion 13
Is rotated counterclockwise and the rotation of the pinion 13 causes the rack 12 and the piston 16 to move toward the cover 3 side against the urging force of the spring 18, but as shown in FIG. The member 7 is the first stopper surface of the end surface of the cylinder chamber 5a.
It contacts S1 and reaches the forward end position. In this case, the distance that the rack 12 and the piston 16 move to the cover 3 side is restricted by the stroke between the forward end position and the backward end position of the neutral position setting member 6.

Further, in the state shown in FIG. 1, contrary to the above, by supplying a fluid pressure to the pressurizing side 5b through the supply / discharge port 3b and acting the fluid pressure on the piston 16, the piston 1
6, the rack 12 and the neutral position setting member 7 are moved to the cover 2 side against the biasing force of the spring 9, and the neutral position setting member 7 is brought into contact with the second stopper surface S2 on the right end surface of the stroke adjusting member 10b. Move backward until

At this time, as the rack 12 moves, the pinion 13
Is rotated in the clockwise direction, and the rotation of the pinion 13 causes the rack 11 and the piston 15 to resist the biasing force of the spring 17 and the cover 3
However, the neutral position setting member 6 contacts the first stopper surface S1 of the end surface of the cylinder chamber 5a and remains stopped at the forward end position.

 Next, the operation of this embodiment will be described.

FIG. 1 shows a state in which the supply / discharge ports 3a, 3b are opened via the solenoid valves 19, 20, respectively, and the swing shaft 14 is stopped at the neutral position of the swing stroke. That is, in this state, the neutral position setting members 6 and 7 are brought into contact with the first stopper surfaces S1 of the end surfaces of the cylinder chambers 4a and 5a by the springs 8 and 9 and are in the forward end position.

When fluid pressure is supplied from the fluid pressure source 21 to the supply / discharge port 3a via the solenoid valve 19 in a state where the swing shaft 14 is in the neutral position, the fluid pressure flows into the pressurizing side 4b and the piston 15 Acts on the right end face. Due to the action of this fluid pressure on the piston 15, as shown in FIG. 2, the piston 15, the rack 11, and the neutral position setting member 6 are moved toward the cover 2 side against the biasing force of the spring 8, and the neutral position is reached. Setting member 6 is sloak adjustment member 10
Retreat until it contacts the second stopper surface S2 on the right end surface of a,
Stop at that position.

The pinion 13 is swung counterclockwise as the rack 11 moves, and the rack 1 is moved through the pinion 13.
2. The piston 16 moves toward the cover 3 side against the urging force of the spring 18, but the neutral position setting member 7 contacts the first stopper surface S1 on the right inner end surface of the cylinder chamber 5a as shown in FIG. Contacted and stopped at the forward end position.

During such an operation, the swing shaft 14 is swung counterclockwise along with the swing of the pinion 13. When this direction is defined as the forward rotation direction, the swing shaft 14 is swung from the neutral position of the swing stroke to the swing end in the forward rotation direction.

Next, in the state shown in FIG. 2, when the fluid pressure on the pressurizing side 4b is discharged to the outside through the supply / discharge port 3a and the solenoid valve 19, the urging force of the springs 8 and 18 and the racks 11 and 12 and the pinion 13 are released.
The piston 15, the rack 11, and the neutral position setting member 6 are moved to the cover 3 side, and the piston 16 and the rack 12 are moved to the cover 2 side in synchronization with each other by the meshing with, as shown in FIG. , The neutral position setting members 6 and 7 are the cylinder chamber 4
The first stopper surfaces S1 of the end surfaces of a and 5a are brought into contact with each other and stopped at the positions of the respective forward ends.

In such an operation, the swing shaft 14 is swung clockwise along with the swing of the pinion 13, and is swung from the swing end in the forward direction to the neutral position of the swing stroke. .

As described above, according to the present embodiment, by repeatedly supplying and discharging the fluid pressure to and from the supply / discharge port 3a, the swing shaft 14 swings in the range between the swing end in the forward rotation direction and the neutral position of the swing stroke. Can be moved.

Contrary to the above, if the fluid pressure is repeatedly supplied to and discharged from the supply / discharge port 3b, the swing shaft 14 swings in the range between the swing end in the reverse direction and the neutral position of the swing stroke. It is possible to obtain a swinging motion different from the above.

Further, for example, in the state shown in FIG. 2 (the state where the swing shaft 14 is located at the swing end in the forward direction), the liquid pressure is supplied to the pressurizing side 5b through the supply / discharge port 3b, and the piston 1
6, the rack 12 and the neutral position setting member 7 are moved to the cover 2 side until the member 7 comes into contact with the second stopper surface S2 on the right end surface of the stroke adjusting member 10b. Subsequently, the liquid pressure is supplied to the pressurizing side 4b through the supply / discharge port 3a, and the piston 15, the rack 11, and the neutral position setting member 6 moved to the cover 3 side.
This member 6 is the second end of the right end surface of the stroke adjusting member 10a.
By moving to the cover 2 side until it abuts on the stopper surface S2, the swing shaft 14 swings in the range of the swing end in the forward rotation direction and the swing end in the reverse rotation direction. Can also obtain different rocking movements.

Further, according to this embodiment, the swing in the range between the neutral position and the swing end in the forward rotation direction, the swing in the range between the neutral position and the swing end in the reverse rotation direction, and the swing in the forward rotation direction are performed. By appropriately combining three types of swing motions of swings in the range of the swing end and the swing end in the reverse direction, a complicated swing motion of the swing shaft can be obtained.

The rotary actuator of the present embodiment can be used in a wide range of applications, such as in an automatic sorting device.

The present invention has been specifically described above based on the embodiments, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the scope of the invention.

[Effect of device]

According to the structure of the rotary actuator of the present invention, the following effects can be obtained.

(1). When the two neutral position restricting members forming a pair are moved to the forward end positions in contact with the first stopper, respectively, the swing shaft can be set to the neutral position. Can be oscillated in the reverse direction, and the oscillating motion of the oscillating shaft in one direction from the neutral position of the oscillating stroke and the oscillating motion in the other direction from the neutral position of the oscillating stroke can be arbitrarily performed. This can be obtained, and by appropriately combining these swinging movements, the swinging movement of the swinging shaft can be diversified.

(2). Due to the effect of (1) described above, the rotary actuator can be caused to perform complicated work.

(3). Due to the effect of (2) described above, the range of use of the rotary actuator can be expanded.

[Brief description of drawings]

FIG. 1 is a sectional view showing a rotary actuator which is an embodiment of the present invention, and FIG. 2 is a sectional view for explaining an operating state of the rotary actuator of FIG. 1 ... Cylinder body, 1a, 1b ... Breathing port, 1c, 1d ...
… Port, 1e, 1f …… Breathing port, 2,3 …… Cover, 2
a, 2b …… Screw hole, 3a, 3b …… Supply / discharge port, 4,5 …… Fluid pressure chamber, 4a, 5a …… Cylinder chamber, 4c, 5c …… Guide hole, 4e, 5e
...... Liquid pressure chamber, 6, 7 ...... Neutral position setting member, 8, 9 ...... Spring (biasing means), 10a, 10b ...... Stroke adjusting member, 11, 12
...... Rack, 13 ...... Pinion, 14 ...... Swing axis, 15,16 ...
… Piston, 17,18 …… Spring, 19,20 …… Solenoid valve, 21 ……
Liquid pressure source, S1 ... 1st stopper surface (1st stopper), S2
...... Second stopper surface (second stopper)

Claims (1)

(57) [Scope of utility model registration request] 1. A cylinder main body which rotatably supports an integral pinion on a swing shaft and axially slidably supports a pair of racks which are respectively engaged with the pinion and parallel to each other, and the respective racks. A pair of pistons that are located at one end side of the cylinder body and that are slidably provided in fluid pressure chambers formed in the cylinder body in the respective axial directions and that swing the pinion in forward and reverse directions; Is provided in a cylinder chamber formed on the other end of the rack and formed in the cylinder body, and abuts and slides on the rack between a forward end position and a backward end position apart from the forward end position. A pair of neutral position setting members that stop at the forward end position and separate from the rack when the rack that is in contact with the forward end position slides in the direction opposite to the backward end position; A spring provided in each cylinder chamber for urging a spring force toward each of the neutral position setting members toward the forward end position; A pair of first stoppers for setting the shaft to the neutral position, and a pair of second stoppers for contacting the neutral position setting member pushed by the rack corresponding thereto by the driving of one of the pistons at the retracted end position. A rotary actuator comprising: