JP5886621B2 - Drive system - Google Patents

Description

  The present invention relates to a drive system, and more particularly to a mechanism for maintaining a stopped state.

  In a production line in a factory, an air cylinder is often used as a drive source. Air compressed by an air compressor is supplied to the air cylinder via a solenoid valve. The air compressor and the air cylinder are connected via a pipe, and each time the air cylinder is driven, compressed air is supplied by the switching operation of the solenoid valve.

  Applications of the air cylinder in the production line include a moving device for lifting a workpiece, a chuck device, and the like. In particular, the chuck apparatus has an advantage that the apparatus can be easily downsized as compared with the case where an electric motor is used as a driving source for opening and closing the chuck.

Japanese Patent Publication No. 02-10281 Japanese Patent Application Laid-Open No. 08-270605

  However, the drive system that drives the air compressed by the air compressor to the air cylinder via the electromagnetic valve has a problem of low energy efficiency. If it is possible to replace an electric motor at a location driven using an air cylinder, it is considered that the driving energy for performing the same driving can be reduced to 1/3.

However, as described above, it is substantially impossible to replace the air cylinder with an electric motor or the like having an equivalent force from the viewpoint of the arrangement space.
Also, in a drive system that supplies air compressed by an air compressor to an air cylinder via a solenoid valve, the air pressure in the air cylinder decreases when the solenoid valve is switched, and the tool at the tip of the rod of the air cylinder drops. There may be a case where the state immediately after the air compressor is stopped cannot be maintained due to a weight or the like. Thus, if the rod of the air cylinder moves due to a decrease in air pressure, there is a problem from the viewpoint of safety and production line accuracy.

Note that the above-described problem is not limited to a drive system having an air cylinder, and can occur in a drive system having a fluid cylinder such as a hydraulic cylinder, for example.
The present invention has been made to solve the above-described problems, and by using existing equipment to the maximum extent, it is possible to obtain high energy efficiency while suppressing an increase in equipment cost, and energy consumption. An object of the present invention is to provide a drive system that can reliably maintain the stopped state of the fluid cylinder even when the supply of is stopped.

Therefore, the present invention adopts the following configuration.
The drive system according to the present invention includes (i) a fluid cylinder, (ii) a fluid capacity control unit, and (iii) a pipe.
(I) Fluid cylinder; a first cylinder having a first cylinder container and a first piston housed in a movable state in the first cylinder container, with the first piston as a partition in the first cylinder container A chamber is constructed.

  (Ii) Fluid capacity control unit; controls the fluid capacity in the first cylinder chamber of the fluid cylinder. Specifically, the second cylinder container, the second piston housed in a movable state in the second cylinder container, and the second piston electrically connected to the second piston and movable in the second cylinder container. In the second cylinder chamber configured with the second piston as a partition in the second cylinder container, the internal volume changes due to the movement of the second piston that receives the action from the electric power source. The fluid capacity changes accordingly.

(Iii) Piping; The fluid cylinder and the fluid capacity control unit are connected in an airtight state. Specifically, the first cylinder chamber in the fluid cylinder and the second cylinder chamber in the fluid capacity control unit are connected, and the fluid in the first cylinder chamber and the second cylinder chamber is kept airtight by the connection.
In the drive system according to the present invention, the first piston of the fluid cylinder moves in conjunction with the movement of the second piston of the fluid capacity control unit. The fluid capacity control unit further includes a pin-like body that follows the movement of the second piston and moves in the same direction as the movement direction of the second piston on the second cylinder chamber side.

  In the drive system according to the present invention, in the fluid capacity control unit, when the second piston is in the first movable range, the second cylinder chamber and the piping are in the first state in which the second piston chamber is in communication with the second piston. When in the second movable range, the flow of fluid between the second cylinder chamber and the pipe is blocked by closing the opening connected to the pipe in the second cylinder chamber by the side peripheral surface of the pin-like body. It is characterized by being in the second state.

  In the drive system according to the present invention, in the fluid capacity control unit, the second piston is moved under the action of the electric power source, thereby changing the internal volume of the second cylinder chamber. Since the second cylinder chamber is hermetically connected to the first cylinder chamber of the fluid cylinder via a pipe, the fluid moves between the first cylinder chamber and the second cylinder chamber in accordance with the amount of change in the internal volume of the second cylinder chamber. Occurs, and the first piston of the fluid cylinder moves.

  As described above, in the drive system according to the present invention, the fluid (air, oil, etc.) compressed by the compressor is not supplied to the fluid cylinder via the control valve such as an electromagnetic valve, but the second in the fluid capacity control unit. Since the internal volume of the cylinder chamber is changed by the action of the electric power source, thereby moving the first piston of the fluid cylinder, fluid is supplied via a control valve such as an electromagnetic valve, thereby driving the fluid cylinder. High energy efficiency can be achieved compared to the prior art.

In the drive system according to the present invention, it is also possible to install the fluid capacity control unit at a position away from the fluid cylinder while using the fluid cylinder such as an existing chuck device as it is. Therefore, it is possible to realize a production line having high energy efficiency while using existing equipment as much as possible.
In the drive system according to the present invention, when the second piston in the fluid capacity control unit is in the second movable range, the opening connected to the pipe in the second cylinder chamber is closed by the side peripheral surface of the pin-like body. It has become. In the drive system according to the present invention, by adopting this configuration, if the electric power source is stopped when the second piston is in the second movable region, the fluid between the pipe and the second cylinder chamber can be stopped. Since the flow is blocked, the second piston does not move undesirably. Therefore, in the drive system according to the present invention, if the drive of the system is stopped while the second piston is in the second movable range, the position of the first piston of the fluid cylinder is maintained in the state immediately after the stop. It is excellent from the viewpoint of safety and production line accuracy.

Although it is conceivable to use a motor with a brake as the electric power source, from the viewpoint of cost and high design freedom, the first piston of the fluid cylinder can be surely used without using a motor with a brake. The drive system according to the present invention that can maintain the stopped state is superior from the viewpoint of equipment cost.
Therefore, the drive system according to the present invention can obtain high energy efficiency while suppressing an increase in equipment cost by using the existing equipment to the maximum, and even when the supply of energy is stopped. The stopped state of the fluid cylinder can be reliably maintained.

In the drive system according to the present invention, for example, the following variation configuration can be adopted.
In the drive system according to the present invention, when the above configuration is adopted, a third cylinder chamber is formed in the first cylinder container of the fluid cylinder on the opposite side of the first cylinder chamber with the first piston as a boundary. The fluid capacity control unit has a fourth cylinder chamber in which the internal volume changes in an inversely proportional relationship with the change in the internal volume of the second cylinder chamber due to the action from the electric power source. The cylinder chamber and the fourth cylinder chamber in the fluid capacity control unit are connected by a second pipe, and the fluid in the third cylinder chamber and the fourth cylinder chamber is hermetically maintained by the connection, and the fluid capacity control unit The 4 cylinder chamber side further has a second pin-like body that follows the movement of the second piston and moves in the same direction as the movement direction of the second piston. When the piston is in the third movable range, the opening connected to the second pipe in the fourth cylinder chamber is closed by the side peripheral surface of the second pin-shaped body, whereby the fourth cylinder chamber and the second pipe are closed. It is also possible to adopt a configuration in which a third state is reached in which the fluid flow is interrupted.

Thus, by controlling both volumes of the first cylinder chamber and the third cylinder chamber in the fluid cylinder by the fluid capacity control unit, the first piston of the fluid cylinder can be controlled with high accuracy.
Moreover, when the 2nd piston in a fluid capacity | capacitance control part exists in a 3rd movable region, it becomes the structure by which the opening connected to 2nd piping in a 4th cylinder chamber is obstruct | occluded by the side peripheral surface of a 2nd pin-shaped body. . Further, by adopting this configuration, if the electric power source is stopped when the second piston is in the third movable region, the fluid flow between the second pipe and the fourth cylinder chamber is interrupted. Therefore, the second piston does not move undesirably. Therefore, when the above configuration is adopted, the position of the first piston of the fluid cylinder is maintained in the state immediately after the stop even when the driving of the system is stopped while the second piston is in the third movable range. Therefore, it is excellent in terms of safety and production line accuracy.

  In the drive system according to the present invention, when the above configuration is adopted, the first and second openings of the cylindrical body having the linear cylinder shaft are the first and second openings in the second cylinder container in the fluid capacity control unit. The second piston is movable along the cylinder axis in the second cylinder container, and the fourth cylinder chamber is defined as a boundary between the second piston and the second cylinder chamber. It is comprised on the opposite side of the cylinder axis direction, and the pin-like body projects from the end face of the second piston facing the second cylinder chamber along the cylinder axis into the second cylinder chamber, and the second pin-like body is The second piston protrudes from the end face facing the fourth cylinder chamber into the fourth cylinder chamber along the cylinder axis. And the 1st recessed part which accepts insertion of a pin-shaped body in an airtight state is opened in the 1st end wall, and the 2nd end wall receives the insertion of the 2nd pin-like body in an airtight state. 2 recesses are provided, the piping is connected to the second cylinder chamber via the first recess, and the second piping is connected to the fourth cylinder chamber via the second recess. Can also be adopted.

  The above effect can also be obtained when a specific configuration as described above is employed. That is, when the pin-like body is inserted into the first recess, the opening connected to the pipe provided on the first end wall is blocked by the side peripheral surface of the pin-like body, and the second piston is prevented from moving undesirably. Thus, undesired movement of the first piston in the fluid cylinder is also suppressed. Similarly, when the second pin-like body is fitted in the second recess, the opening connected to the pipe provided on the second end wall is closed by the side peripheral surface of the second pin-like body, and the second piston is not allowed. The desired movement is suppressed, and the undesired movement of the first piston in the fluid cylinder is also suppressed.

  In the drive system according to the present invention, when the above configuration is adopted, each of the pin-like body and the second pin-like body includes a columnar portion having a side peripheral surface parallel to the cylinder axis and a tapered portion at the tip. In the second state, the opening connected to the pipe is closed by the side peripheral surface of the cylindrical portion of the pin-shaped body, and in the third state, the opening is connected by the side peripheral surface of the cylindrical portion of the second pin-shaped body. It is also possible to employ a configuration in which the opening connected to the two pipes is closed.

  In the case of adopting the above configuration, when the system is stopped in the second state, the fluid from the first cylinder chamber of the fluid cylinder passes through the piping to the second cylinder chamber of the fluid capacity control unit. Even if it tries to flow in, the inlet of the second cylinder chamber is closed at the side peripheral surface of the cylindrical portion of the pin-like body, so that no force component toward the cylinder axis direction is applied to the second piston. That is, the side peripheral surface of the cylindrical portion of the pin-like body is parallel to the cylinder axis, the direction in which the fluid pressure is applied to the side peripheral surface is the direction orthogonal to the cylinder axis, and the pressure from the pipe is the second The component with respect to the cylinder axis direction which is the moving direction of the piston is “0”.

Similarly, when the system is stopped in the third state, even if fluid from the third cylinder chamber of the fluid cylinder attempts to flow into the fourth cylinder chamber of the fluid capacity control unit via the second pipe, Since the inlet of the fourth cylinder chamber is closed at the side peripheral surface of the cylindrical portion of the pin-like body, no force component toward the cylinder axis direction is applied to the second piston.
In the drive system according to the present invention, when the above configuration is adopted, a configuration is adopted in which a fluid adjustment unit for replenishing or reducing the internal fluid is connected to at least one of the pipe and the second pipe. You can also. If the fluid adjusting unit is provided as described above, the piping or the second piping is caused by a fluid leakage or the like due to factors over time between the fluid cylinder and the fluid capacity control unit and the piping and the second piping. Even when the pressure of the fluid enclosed in the fluid fluctuates, the fluid pressure can be maintained within a predetermined range. Therefore, the positional accuracy related to the movement of the fluid cylinder can be maintained high.

In addition, when performing maintenance of a drive system regularly, it is not necessary to necessarily provide a fluid adjustment part.
In the drive system according to the present invention, when the above configuration is employed, a configuration in which the fluid adjusting unit replenishes or reduces the internal fluid based on the ambient temperature may be employed. The pressure of the fluid strongly depends on the ambient temperature even in the external environment. For this reason, when the ambient temperature changes, the fluid cylinder's moving accuracy may decrease, but as described above, the fluid adjustment unit that replenishes and reduces the internal fluid based on the ambient temperature is being configured. If it is made to include, the fluctuation | variation of the fluid pressure accompanying the change of ambient temperature can be suppressed, and the movable precision of a fluid cylinder can be maintained highly.

  In the drive system according to the present invention, when the above configuration is employed, a configuration in which the fluid is air may be employed. In addition to air, for example, a gas such as nitrogen gas or a liquid such as oil can be employed as the fluid.

It is a model perspective view which shows schematic structure of the drive system 1 which concerns on Embodiment 1 of this invention. 2 is a schematic cross-sectional view showing a detailed configuration of the drive system 1. FIG. It is a schematic cross section which shows a part of structure of the air capacity | capacitance control part 13 in a movable state. It is a schematic cross section which shows a part of structure of the air capacity | capacitance control part 13 in a stop state. It is a schematic cross section which shows schematic structure of the drive system 2 which concerns on Embodiment 2 of this invention. It is a schematic cross section which shows schematic structure of the drive system 3 which concerns on Embodiment 3 of this invention. It is a schematic cross section which shows schematic structure of the drive system 4 which concerns on Embodiment 4 of this invention. It is a schematic cross section which shows schematic structure of the drive system 5 which concerns on Embodiment 5 of this invention.

In the following, carrying in order to carry out the present invention will be described with reference to the drawings.
Note that the embodiments according to the following description are used as examples for easily explaining the structural features of the present invention and the operational effects obtained from the characteristic configurations. Therefore, the present invention is not limited to the following modes except for essential features.
[Embodiment 1]
1. Schematic Configuration of Drive System 1 A schematic configuration of the drive system 1 according to Embodiment 1 of the present invention will be described with reference to FIG.

As shown in FIG. 1, in the drive system 1 according to the present embodiment, an air cylinder 16 and an air capacity control unit 13 are connected by two pipes 14 and 15. A rotation shaft 131 extends from the air capacity control unit 13 toward the left rear side in the X-axis direction, and is connected to the rotation shaft 111 of the gear box 11 via the coupler 12.
An electric motor 10 is attached to the gear box 11. The rotational driving force from the electric motor 10 is input to the air capacity control unit 13 via the gear box 11.

The drive system 1 also includes a controller 17 that monitors and controls the rotation angle of the electric motor 10, and the connection wiring 101 of the electric motor 10 is connected to the controller 17.
In the drive system 1, the rotation shaft 111 of the gear box 11 rotates according to the rotation of the power shaft of the electric motor 10 (arrow A), so that the rod 161 of the air cylinder 16 appears and disappears (arrow). B).

2. Detailed Configuration of Drive System 1 A detailed configuration of the drive system 1 according to the first embodiment will be described with reference to FIG. In FIG. 2, a part of the configuration of the drive system 1 is extracted and drawn.
As shown in FIG. 2, the air capacity control unit 13 includes a piston 133 that is movable in the cylinder axis direction in the cylinder container 130. The piston 133 is formed with a gear and meshes with a gear 132 connected to the rotation shaft 131. Therefore, the piston 133 is movable to the left and right in the cylinder axis direction according to the rotation amount of the gear 132.

  The space in the cylinder container 130 of the air capacity control unit 13 is partitioned into a cylinder chamber 130a and a cylinder chamber 130b with the piston 133 as a boundary. A concave portion 130c provided so as to extend in the cylinder axis direction is communicated with the cylinder chamber 130a, and a pipe 14 is connected to the concave portion 130c. Similarly, a recess 130d provided so as to extend in the cylinder axis direction is communicated with the cylinder chamber 130b, and a pipe 15 is connected to the recess 130d.

On the piston 133, a pin-shaped body 134 is formed to project toward the cylinder chamber 130a, and a pin-shaped body 135 is formed to project toward the cylinder chamber 130b. The pin-like bodies 134 and 135 are fitted in the recesses 130c and 130d in an airtight state, respectively.
The air cylinder 16 includes a piston 162 that is movable in the cylinder axis direction in a cylinder container 160. A rod 161 is connected to the piston 162. A space in the cylinder container 160 in the air cylinder 16 is partitioned into a cylinder chamber 160a and a cylinder chamber 160b with the piston 162 as a boundary. The cylinder chamber 160 a is connected to the cylinder chamber 130 a of the air capacity control unit 13 through the pipe 14. Similarly, the cylinder chamber 160 b of the air cylinder 16 is connected to the cylinder chamber 130 b of the air capacity control unit 13 through the pipe 15.

3. Pin-shaped bodies 134 and 135 and recesses 130c and 130d
The relationship between the pin-like bodies 134 and 135 and the recesses 130c and 130d and the effects produced by the drive system 1 will be described with reference to FIGS.
First, as shown in FIG. 3, the piston 133 is moved rightward or leftward in the Y-axis direction by the rotational drive of the electric motor 10 (arrow D). At this time, the volume of the cylinder chambers 130a and 130b (the cylinder chamber 130b is not shown in FIG. 3) is changed, and the air corresponding to the changed volume becomes the recesses 130c and 130d (the recess 130d is shown in FIG. 3). It is pushed through the pipes 14 and 15 through the pipes 14 and 15 through the pipes 14 and 15. As a result, the volumes of the cylinder chambers 160a and 160b of the air cylinder 16 connected to the pipes 14 and 15 change, and the piston 162 moves (see FIG. 2).

As shown in FIG. 3, an O-ring 136 is attached to the peripheral surface facing the recesses 130c and 130d (the recess 130d is not shown in FIG. 3) to ensure airtightness.
Next, as shown in FIG. 4, when the drive of the air cylinder 16 is to be stopped in the drive system 1, the pin-like bodies 134 and 135 are inserted into the recesses 130c and 130d (the pin-like body). (See FIG. 2 for 135 and recess 130d).

Each of the pin-like bodies 134 and 135 is formed integrally with a base portion having a cylindrical shape and a tip portion having a tapered shape. The recesses 130c and 130d correspond to the shapes of the pin-like bodies 134 and 135, respectively.
When the pin-like bodies 134 and 135 are inserted into the recesses 130c and 130d up to the root portion, the O-ring 136 is brought into an airtight state, and the opening 130e is closed at the lower end portion in the Z-axis direction. Specifically, the lower end portion in the Z-axis direction of the opening 130e is closed by the side peripheral surfaces of the cylindrical portions of the pin-like bodies 134 and 135.

As described above, when the pin-like bodies 134 and 135 are fitted in the recesses 130c and 130d, the openings connected to the pipes 14 and 15 are blocked by a part of the side peripheral surface of the cylindrical portion. Thereby, the movement of the piston 162 in the air cylinder 16 is suppressed.
Here, when the supply of electric power to the electric motor 10 is stopped in the state shown in FIG. 4 and an external force is applied to the rod 161 of the air cylinder 16, the rod 161 is connected to the opening 130 e via the pipe 14. Pressure is applied in proportion to the force applied to the.

However, as shown in FIG. 4, the side peripheral surface of the cylindrical portion of the pin-shaped body 134 is orthogonal to the axial direction (Z-axis direction) of the opening 130 e, and the piston is driven by the pressure from the pipe 14. There is no force component that causes 133 to move in the Y-axis direction. The same applies to the relationship between the pin-shaped body 135, the recess 130d, and the pipe 15.
Therefore, in the drive system 1 according to the present embodiment, the stopped state of the air cylinder 16 can be reliably maintained even when the energy supply (power supply to the electric motor 10) is stopped.

  Further, in the drive system 1 according to the present embodiment, the air compressed by the compressor is not supplied to the air cylinder via the electromagnetic valve, but the internal volume of the cylinder chambers 130a and 130b in the air capacity control unit 13 is electrically driven. Since it is changed by the rotational drive of the motor 10 and thereby the piston 162 of the air cylinder 16 is moved, higher energy efficiency can be realized as compared with the prior art using an electromagnetic valve.

In the drive system 1 according to the present embodiment, for example, the air capacity control unit 13 can be installed at a position away from the air cylinder 16 while using the air cylinder 16 such as an existing chuck device as it is. is there. Therefore, it is possible to realize a production line having high energy efficiency while using existing equipment as much as possible.
In the drive system 1 according to the present embodiment, the cylinder chamber 160a of the air cylinder 16 and the cylinder chamber 130a of the air capacity control unit 13 through the pipe 14 have, for example, 1 × 10 ⁵ [Pa] to 9 × 10 ⁵ [Pa] air is filled.

[Embodiment 2]
A drive system 2 according to Embodiment 2 of the present invention will be described with reference to FIG. In FIG. 5, element parts having the same configuration as that of the drive system 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted below.
As shown in FIG. 5, the drive system 2 according to the present embodiment is characterized in that an air replenishing device is provided in addition to the configuration of the drive system 1 according to the first embodiment. Specifically, the air replenishing device includes an air cylinder, pipes 19 to 21 connecting the air cylinder 18 and the pipes 14 and 15, and valves 22 and 23 inserted in the middle of the pipes 20 and 21. It is configured. Among these, the valves 22 and 23 can be manually opened and closed by the system operator, for example, but a pressure sensor or the like capable of constantly monitoring the air pressure in the pipes 14 and 15 is provided, and based on the measurement results. It is also possible to automatically open and close.

  In the drive system 2 according to the present embodiment, in addition to the components of the drive system 1 according to the first embodiment, an air replenishing device having an air tank 18 and the like is provided. Even when the airtightness is reduced due to factors over time (deterioration, etc.) between the portion 13 and the pipes 14 and 15, the air pressure in the pipes 14 and 15 is kept within a predetermined range. Can be maintained. Therefore, the positional accuracy related to the movement of the air cylinder 16 can be maintained high.

Further, since the drive system 2 according to the present embodiment includes all the components of the drive system 1 according to the first embodiment, the effects produced by the drive system 1 according to the first embodiment are similarly described. Can play.
When considering the state of airtight connection such as between the air cylinder 16 and the air capacity control unit 13 and the pipes 14 and 15, it is not always necessary to provide an air replenishing device in the system.

[Embodiment 3]
The configuration of the drive system 3 according to Embodiment 3 of the present invention will be described with reference to FIG. Also in FIG. 6, element parts having the same configuration as that of the drive system 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted below.
As shown in FIG. 6, in the drive system 3 according to the present embodiment, the form of the air capacity control unit 24 is different from that of the drive system 1 according to the first embodiment. Specifically, the air capacity control unit 24 has two spaces partitioned from each other at a position where the gear 242 is provided in the cylinder container 240, and the pistons 243 and 247 are accommodated in the respective spaces. The pistons 243 and 247 are movable to the left and right in the cylinder axis direction, and a gear that meshes with the gear 242 is provided.

  In the cylinder container 240, the cylinder chamber 240a and the cylinder chamber 240f are partitioned by the piston 243, and the cylinder chamber 240b and the cylinder chamber 240h are partitioned by the piston 247. Similarly to the air capacity control unit 13 according to the first embodiment, the cylinder chambers 240a and 240b are provided with recessed portions 240c and 240d that communicate with each other, and project from the pistons 243 and 247 in the cylinder axis direction. The pin-like bodies 244 and 245 can be fitted in an airtight state.

The recess 240 c is connected to the pipe 14, and the recess 240 d is connected to the pipe 15.
On the other hand, the cylinder chambers 240f and 240h are connected to the outside through communication holes 240g and 240i. Thereby, even when the pistons 243 and 247 move, the cylinder chambers 240f and 240h are maintained at atmospheric pressure.
The drive system 3 according to the present embodiment includes the air capacity control unit 24 configured as described above, and when the gear 242 rotates as the electric motor rotates, the piston 243 and the piston 247 move in opposite directions. To do. As a result, one volume of the cylinder chambers 240a and 240b increases and the other volume decreases. Due to such a volume change, the rod 161 of the air cylinder 16 appears and disappears as shown by the arrow B, as in the drive system 1 according to the first embodiment.

  The drive system 3 according to the present embodiment has the air capacity control unit 24 having a different configuration from the drive system 1 according to the first embodiment. However, the same effect can be obtained. Further, in the drive system 3 according to the present embodiment, the two piston chambers 240a and 240b are configured by the two pistons 243 and 247, and the volume adjustment of the cylinder chambers 240a and 240b at the initial stage is higher. Workability can be realized. That is, if the fine adjustment of each position of the piston 243 and the piston 247 can be performed individually, the initial adjustment can be performed more easily than the drive system 1 according to the first embodiment.

[Embodiment 4]
The configuration of the drive system 4 according to Embodiment 4 of the present invention will be described with reference to FIG. In FIG. 7 as well, element parts having the same configuration as those of the drive systems 1 and 2 according to the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted.
As shown in FIG. 7, the drive system 4 according to the present embodiment is characterized in that a temperature correction device is provided in addition to the configuration of the drive system 2 according to the second embodiment. Specifically, the temperature correction device includes correction cylinders 25, 27, 29, and 31 and pipes 26 and 30 as main elements.

  The correction cylinders 25 and 27 include cylinder containers 250 and 270, respectively, and pistons 251 and 271 are housed in the cylinder containers 250 and 270 in a movable state. Cylinder chambers 250a, 250b, 270a, and 270b are defined inside the cylinder containers 250 and 270, respectively, with pistons 251 and 271 as boundaries. The cylinder chamber 250 a in the correction cylinder 251 communicates with the pipe 14 via the pipe 26.

The cylinder chambers 250b and 270b in the cylinder containers 250 and 270 are released through the openings 250c and 270c, respectively.
Similarly, the cylinders 290 and 310 are divided into cylinder chambers 290a, 290b, 310a and 310b with the pistons 291 and 311 as boundaries, and the cylinder chambers 290b and 310b have openings 290c, Released through 310c. The cylinder chamber 290 a of the cylinder container 290 in the correction cylinder 29 is communicated with the pipe 15 through the pipe 30.

The piston 251 of the correction cylinder 25 and the piston 271 of the correction cylinder 27 are connected to each other by a connecting rod 28, and the piston 291 of the correction cylinder 29 and the piston 311 of the correction cylinder 31 are connected to each other by a connecting rod 32. Yes.
Here, each of the cylinder chamber 270a of the correction cylinder 27 and the cylinder chamber 310a of the correction cylinder 31 is filled with a high thermal expansion fluid. As an example of the high thermal expansion fluid, for example, paraffin can be employed. As the high thermal expansion fluid, a material other than paraffin can be used, and it is desirable to use a substance having a high linear expansion coefficient. When paraffin is employed, the linear expansion coefficient α is 110 × 10 ⁻⁶ [/ ° C.], and the volume expansion coefficient β is expressed by the following mathematical formula.
[Equation 1] β = 3α
As shown in FIG. 7, in the drive system 4 including the temperature correction device having the above-described configuration, for example, when the external air temperature rises and the pressure of the air in the pipes 14 and 15 tends to increase, the correction cylinder 27 The high thermal expansion fluid enclosed in the cylinder chamber 270a and the cylinder chamber 310a of the correction cylinder 31 also expands. For this reason, the volume of the cylinder chamber 270a of the correction cylinder 27 and the volume of the cylinder chamber 310a of the correction cylinder 31 increase, and the pistons 271 and 311 move. Then, the pistons 251 and 291 respectively connected to the pistons 271 and 311 by the connecting rods 28 and 32 also move, and the volumes of the cylinder chambers 250a and 290a are expanded.

The degree of expansion of the volumes of the cylinder chambers 250a and 290a is proportional to the volume expansion of the cylinder chambers 270a and 310a in proportion to the rising temperature.
When the ambient temperature of the system decreases, the temperature correction device moves in the reverse direction.
In the drive system 4 having the above-described configuration, the pipes 14 and 15 and the cylinder chambers 160a and 160b of the air cylinder 16 and the cylinder chamber of the air capacity control unit 13 are operated even when the ambient temperature rises and falls. The air pressure sealed in 130a and 130b is maintained in a predetermined range. Therefore, in the drive system 4 according to the present embodiment, in addition to the effects exhibited by the drive system 2 according to the second embodiment, the system is driven with high accuracy even when the ambient temperature rises and falls. be able to.

For the high thermal expansion fluid sealed in the cylinder chamber 270a of the correction cylinder 27 and the cylinder chamber 310a of the correction cylinder 31, it is possible to use a substance other than paraffin adopted as an example, but in that case Considering the linear expansion coefficient of each substance, for example, a gear or the like is inserted between the piston 251 and the piston 271 and between the piston 291 and the piston 311, so that the movable stroke x of the pistons 271 and 311 is increased. On the other hand, the same effect can be obtained by making the movable stroke y of the pistons 251 and 291 satisfy the following expression.
[Expression 2] y = k × x
In the above formula, “k” is a coefficient based on the difference in thermal expansion coefficient between the air sealed in the pipes 14 and 15 and the high thermal expansion fluid sealed in the cylinder chambers 270a and 310a.

[Embodiment 5]
The configuration of the drive system 5 according to Embodiment 5 of the present invention will be described with reference to FIG. In FIG. 8 as well, element parts having the same configuration as that of the drive system 1 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIG. 8, in the drive system 5 according to the present embodiment, two air cylinders 36 and 46 are connected to one air capacity control unit 13. The air cylinders 36 and 46 have the same configuration, and the pistons 362 and 462 are accommodated in the cylinder containers 360 and 460 in a movable state. Then, the rods 361 and 461 attached to the pistons 362 and 462 appear and disappear in the directions of arrows D and E due to the change in the air capacity of the cylinder chambers 360a, 360b, 460a, and 460b in the cylinder containers 360 and 460.

  In the drive system 5 according to the present embodiment, the pipe 44 connected to the cylinder chamber 130a of the air capacity control unit 13 is branched halfway, and is connected to the cylinder chamber 360a of the air cylinder 36 and the cylinder chamber 460a of the air cylinder 46. It is connected. Similarly, the pipe 45 connected to the cylinder chamber 130b of the air capacity control unit 13 is also branched in the middle, and is connected to the cylinder chamber 360b of the air cylinder 36 and the cylinder chamber 460b of the air cylinder 46.

In the drive system 5 having the above-described configuration, when the piston 133 in the air capacity control unit 13 moves rightward toward the paper surface, the piston 362 of the air cylinder 36 and the piston of the air cylinder 46 according to the amount of movement. Both 462 move leftward toward the page.
Conversely, when the piston 133 in the air capacity control unit 13 moves leftward toward the paper surface, the piston 362 of the air cylinder 36 and the piston 462 of the air cylinder 46 move rightward toward the paper surface according to the amount of movement. To do.

When the movement direction of the piston 362 of the air cylinder 36 and the piston 462 of the air cylinder 46 is to be reversed, the connection of the piping 44 and the piping 45 to the air cylinder 36 is reversed or the piping to the air cylinder 46 is reversed. This can be realized by reversing the connection between the pipe 44 and the pipe 45.
In the case of adopting the above configuration, the two air cylinders 36 and 46 can be driven without using a solenoid valve, and high energy efficiency can be obtained as described above.

[Other matters]
In the drive systems 1, 2, 3, and 4 according to the above-described first, second, third, and fourth embodiments, one air capacity control unit 13 and 24 is provided for one air cylinder 16, but the present invention. Then, the number of air cylinders controlled by one air capacity control unit 13, 24 may be two or more.

As described above, when the drive of two or more air cylinders is controlled by one air capacity control unit 13, 24, the configuration of the drive system 5 according to the fifth embodiment is adopted, It is possible to select an air cylinder to be driven by an opening / closing operation by inserting an opening / closing valve in a pipe with the air capacity control units 13, 24.
In the first, second, third, fourth, and fifth embodiments, the rotational driving force of the electric motor 10 is transmitted to the pistons 133, 243, and 247 via the gears 132 and 242, and the pistons 133, 243, and 247 are movable. However, in the present invention, the electric power source is not limited to the electric motor 10 that outputs the rotational driving force. For example, a linear motor or an electromagnetic solenoid can be used as the electric power source.

Further, as in the driving system 3 according to the third embodiment, in addition to the case where the air capacity control unit 24 includes the two pistons 243 and 247, an air capacity control unit including three or more pistons is employed. You can also.
In the drive systems 1, 2, 3, 4, and 5 according to the first, second, third, fourth, and fifth embodiments, air is used as an example of the fluid. Liquids such as oil can also be used.

  In the drive systems 1, 2, 3, and 4 according to the first, second, third, and fourth embodiments, the volume of fluid in both the two cylinder chambers 160a and 160b of the air cylinder 16 is controlled. However, according to the present invention, it is not always necessary to control the air (fluid) capacity by the air (fluid) capacity control unit for both of the two cylinder chambers sandwiching the piston in the air cylinder. However, in driving the air cylinder, it is necessary to control the piston movement in one direction with a negative pressure, so it is desirable to control the fluid in both cylinder chambers sandwiching the piston.

  In the drive systems 1, 2, 3, 4, and 5 according to the first, second, third, fourth, and fifth embodiments, the pin-like bodies 134, 135, 244, and 245 in the air capacity control units 13 and 24 are pistons. Although the form directly joined to the ends of 133, 243 and 244 is taken as an example, the pin-like body is attached to the piston so that the pin-like body is movable in conjunction with the movement. If possible, the present invention is not limited to this. For example, the pin-shaped body is not directly joined to the piston, but is moved in conjunction with the gear 132 shown in FIG. 2 so that it can move between the cylinder chamber and the pipe within a certain range of motion. The fluid flow path can also be blocked.

  As for the form of the pin-shaped body, not only the hollow pin-shaped bodies 134 and 135 shown in FIG. 2 and the like, but also a solid pin-shaped body or a pin-shaped body having a rectangular cross-sectional shape can be adopted. .

  The present invention is useful for constructing a drive system with high energy efficiency while suppressing the equipment cost by maximizing the use of existing equipment.

1, 2, 3, 4, 5. Drive system 10. Electric motor 11. Gearbox 12. Coupler 13,24. Air capacity control unit 14, 15, 19, 20, 21, 26, 30, 44, 45. Piping 16, 36, 46. Air cylinder 17. Controller 18. Air cylinder 22,23. Valve 25, 27, 29, 31. Correction cylinder 28, 32. Connecting rod 101. Connection wiring 111,131. Rotating shafts 130, 160, 240, 250, 270, 290, 310, 360, 460. Cylinder containers 130a, 130b, 160a, 160b, 240a, 240b, 240f, 240h, 250a, 250b, 270a, 270b, 290a, 290b, 310a, 310b, 360a, 360b, 460a, 460b. Cylinder chambers 130c, 130d, 240c, 240d. Recesses 130e, 240g, 240i, 250c, 270c, 290c, 310c. Opening 132,242. Gears 133, 162, 243, 247, 251, 271, 291, 311, 362, 462. Pistons 134, 135, 244, 245. Pin-shaped body 136. O-ring 161,361,461. rod

Claims (6)

The first cylinder chamber includes a first cylinder container and a first piston housed in a movable state in the first cylinder container, and the first cylinder chamber is configured with the first piston as a partition in the first cylinder container. A fluid cylinder,
A fluid capacity controller for controlling a fluid capacity in the first cylinder chamber of the fluid cylinder;
A pipe connecting the fluid cylinder and the fluid capacity control unit in an airtight state;
With
The fluid capacity control unit includes a second cylinder container, a second piston housed in a movable state in the second cylinder container, and the second piston electrically connected to the second piston. An electric power source that is movable in the cylinder container, and the second cylinder chamber configured with the second piston as a partition in the second cylinder container receives the action from the electric power source. The fluid capacity changes as the internal volume changes due to the movement of the piston,
The pipe connects between the first cylinder chamber in the fluid cylinder and the second cylinder chamber in the fluid capacity control unit, and the fluid in the first cylinder chamber and the second cylinder chamber is hermetically sealed by the connection. Is retained,
The first piston of the fluid cylinder moves in conjunction with the movement of the second piston of the fluid capacity control unit,
On the second cylinder chamber side of the fluid capacity controller, there is further provided a pin-like body that follows the movement of the second piston and moves in the same direction as the movement direction of the second piston,
In the fluid capacity control unit,
When the second piston is in the first movable range, the second cylinder chamber and the pipe are in a first state in a communication state,
When the second piston is in the second movable range, an opening connected to the pipe in the second cylinder chamber is closed by a side peripheral surface of the pin-like body, so that the second cylinder chamber and the pipe are closed. flow of said fluid a shall such the second state is blocked between,
The drive system , wherein the fluid is air . In the first cylinder container of the fluid cylinder, a third cylinder chamber is configured on the opposite side of the first cylinder chamber with the first piston as a boundary,
The fluid capacity control unit has a fourth cylinder chamber in which the internal volume changes in an inverse proportion to the change in the internal volume of the second cylinder chamber due to the action from the electric power source,
The third cylinder chamber in the fluid cylinder and the fourth cylinder chamber in the fluid capacity control unit are connected by a second pipe, and the fluid in the third cylinder chamber and the fourth cylinder chamber is connected by the connection. Airtight,
The fluid capacity control unit further includes a second pin-like body that follows the movement of the second piston and moves in the same direction as the movement direction of the second piston, on the fourth cylinder chamber side. And
In the fluid capacity control unit, when the second piston is in the third movable range, an opening connected to the second pipe in the fourth cylinder chamber is blocked by a side peripheral surface of the second pin-like body. The drive system according to claim 1, wherein the third system is configured such that the fluid flow between the fourth cylinder chamber and the second pipe is blocked. In the fluid capacity control unit,
The second cylinder container is a container in which first and second openings of a cylinder having a linear cylinder axis are sealed by first and second end walls,
The second piston is movable along the cylinder axis in the second cylinder container,
The fourth cylinder chamber is configured on the opposite side of the cylinder axis direction from the second cylinder chamber with the second piston as a boundary,
The pin-like body protrudes from the end face of the second piston facing the second cylinder chamber along the cylinder axis into the second cylinder chamber,
The second pin-like body protrudes from the end face of the second piston facing the fourth cylinder chamber along the cylinder axis into the fourth cylinder chamber,
The first end wall is opened with a first recess for receiving the pin-like body in an airtight state,
The second end wall is provided with a second recess for receiving the insertion of the second pin-like body in an airtight state,
The pipe is connected to the second cylinder chamber via the first recess;
The drive system according to claim 2, wherein the second pipe is connected to the fourth cylinder chamber via the second recess. Each of the pin-like body and the second pin-like body is composed of a columnar portion having a side peripheral surface parallel to the cylindrical axis, and a tapered portion at the tip.
In the second state, an opening connected to the pipe is closed by a side peripheral surface of the columnar portion of the pin-shaped body,
4. The drive system according to claim 3, wherein in the third state, an opening connected to the second pipe is closed by a side peripheral surface of the columnar portion of the second pin-like body. 5. The drive according to claim 2, wherein at least one of the pipe and the second pipe is connected to a fluid adjusting unit for replenishing or reducing an internal fluid. system. The drive system according to claim 5, wherein the fluid adjustment unit performs the replenishment or reduction based on an ambient temperature.

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