TW202012796A - Fluid pressure cylinder - Google Patents

Abstract

Provided is a fluid pressure cylinder of a stroke adjustment type in which a failure is less likely to occur. This fluid pressure cylinder is configured such that: a first abutment part is provided to the rear face side of a first piston and is configured to be enterable into a third section through a communication port of a partition wall so as to be abuttable against a second abutment part; and the second abutment part is provided to the front face side of a second piston, and is configured, when being in abutment against the first abutment part, to restrict rearward movement of a first piston member.

Description

Fluid pressure cylinder

The invention relates to a fluid pressure cylinder.

As the fluid pressure cylinder, for example, a structure shown in FIG. 1 of the present application has been proposed. The cylinder portion 4 in the work holding device of Patent Document 1 also has the structure shown in FIG. 1 of the present application. As shown in FIG. 1 of the present application, such a conventional fluid pressure cylinder includes a cylinder 10, a first piston member 20, and a second piston member 30. The internal space of the cylinder 10 is partitioned by the partition wall 14 into a first cylinder chamber 10a located on the front side and a second cylinder chamber 10b located on the rear side.

In the conventional fluid pressure cylinder shown in FIG. 1 of the present application, when the second piston member 30 is configured to move forward, the first piston member 20 can only move back and forth within a narrow range on the front side of the first cylinder chamber 10a When the second piston member 30 is moved backward, the second abutment portion 30a is moved backward by a corresponding degree, so that the stroke range of the first piston member 20 can be expanded backward.

【Existing technical documents】

【Patent Document】

Patent Document 1: Japanese Patent Laid-Open No. 2015-013338

In the conventional fluid pressure cylinder shown in FIG. 1 in this case, the structure in which the sleeve portion 32 of the second piston member 30 enters the area A ₂ of the first cylinder chamber 10a is adopted.

In the fluid pressure cylinder shown in FIG. 1 of the present application, in a state where the pressure in the region A ₂ is increased to the set value and the first piston member 20 is moved to the forward end, the pressure in the region A ₄ is increased to cause the second piston member 30 After advancing, the pressure in area A ₂ will become higher than the above set value. When the pressure in the area A ₂ exceeds the set value, the cylinder 10 or the first piston member 20 and the like are deformed, and there is a danger that the fluid pressure cylinder may malfunction.

The present invention has been made to solve the above-mentioned problems, and provides a fluid pressure cylinder that is less prone to malfunction.

According to the present invention, there is provided a fluid pressure cylinder including a cylinder tube, a first piston member, and a second piston member. Here, the cylinder has a first cylinder chamber, a second cylinder chamber, and a partition wall. The partition wall is provided to divide the first cylinder chamber and the second cylinder chamber, and a communication port is formed. The second cylinder chamber is arranged behind the first cylinder chamber. The first piston member has a first piston and a first contact portion, and the first cylinder chamber is divided into a first area and a second area. The second piston member has a second piston and a second contact portion, and the second cylinder chamber is divided into a third area and a fourth area. The first piston is accommodated in the first cylinder chamber, and the second piston is accommodated in the second cylinder chamber. The first region is located on the front side of the first piston, the second region is located on the rear side of the first piston, the third region is located on the front side of the second piston, and the fourth region is located on the rear side of the second piston. The first contact portion is provided on the rear surface side of the first piston, and is configured to enter the third area through the communication port of the partition wall so as to contact the second contact portion. The second abutting portion is provided on the front surface side of the second piston, and is configured to restrict the first piston member from moving backward when abutting on the first abutting portion.

In the configuration of the present invention, the first contact portion enters the third area of the second cylinder chamber, and the first contact portion and the second contact portion contact. As a result, in a state where the pressure in the second region of the first cylinder chamber is increased to the set value and the first piston member is advanced, even if the pressure in the fourth region of the second cylinder chamber increases, the second piston member is advanced As a result, after the first abutting portion and the second abutting portion are in contact, it is still possible to prevent the pressure in the second area from being higher than the above-mentioned set value. As a result, the fluid pressure cylinder is less likely to malfunction.

Preferably, a fluid pressure cylinder is provided in which the first piston member further has a cylindrical insertion portion. The columnar insertion portion is provided on the rear surface side of the first piston, and is in a state of sliding contact with the inner peripheral surface of the communication port and movable in the front-rear direction, and the communication port is inserted, and the The rear end portion of the columnar insertion portion is formed as a first contact portion.

Preferably, a fluid pressure cylinder is provided in which the first piston member further has a rear shaft portion and a release recess. The second piston member further has a rear shaft insertion hole and a sleeve portion. The rear shaft portion is provided so as to penetrate the second cylinder chamber in the front-rear direction, and is provided to protrude rearward from the rear surface side of the first piston. The rear shaft portion insertion hole is inserted through the rear shaft portion, and the sleeve portion is provided on the front surface side of the second piston member where the rear shaft portion insertion hole is provided. The release concave portion is provided on the rear surface side of the columnar insertion portion, and is configured to release the sleeve portion when the first abutting portion and the second abutting portion abut.

It is preferable to provide a fluid pressure cylinder in which the second contact portion is configured not to enter the second area through the communication port of the partition wall.

It is preferable to provide a fluid pressure cylinder in which the first piston member retreats when the pressure in the first region is higher than the pressure in the second region, advances when the pressure in the second region is higher than the pressure in the first region, and the second piston member When the pressure in the third zone is higher than the pressure in the fourth zone, it will retreat, and when the pressure in the fourth zone is higher than the pressure in the third zone, it will advance.

Preferably, a fluid pressure cylinder is provided, wherein the third area is external air pressure.

It is preferable to provide a fluid pressure cylinder in which the stroke range of the first piston member is adjusted by the change of the front-rear position of the second piston member.

It is preferable to provide a fluid pressure cylinder including a cylinder, a first piston member, and a second piston member,

Wherein, the cylinder has a first cylinder chamber and a second cylinder chamber arranged on the rear side of the first cylinder chamber, and a communication port is provided in the partition wall separating the first cylinder chamber and the second cylinder chamber,

The first piston member has a first piston housed in the first cylinder chamber and a first contact portion provided on the rear surface side of the first piston,

The second piston member has a second piston housed in the second cylinder chamber and a second abutment portion provided on the front surface side of the second piston,

Among them, the first cylinder chamber is divided into a first region located on the front side of the first piston and a second region located on the rear side of the first piston,

The second cylinder chamber is divided into a third area located on the front side of the second piston and a fourth area located on the rear side of the second piston,

When fluid is supplied to the first area and the pressure in the first area increases, the pressure is applied to the front surface side of the first piston, and the first piston member retreats,

When fluid is supplied to the second region and the pressure in the second region increases, the pressure is applied to the rear surface side of the first piston, and the first piston member advances,

When the fluid is supplied to the fourth area and the pressure in the fourth area increases, the pressure is applied to the rear surface side of the second piston, and the second piston member advances,

The first abutment portion and the second abutment portion abut against each other through the communication port, thereby restricting the movement of the first piston member to the rear,

The stroke range of the first piston member is adjusted by changing the front-rear position of the second piston member,

The first contact portion is provided in a state where it can enter the second area through the communication port,

The second contact portion is provided so as not to enter the second area

Furthermore, the third area is open to the outside atmosphere.

10‧‧‧Cylinder

10a‧‧‧1st cylinder room

10b‧‧‧Cylinder room 2

11‧‧‧Front wall

12‧‧‧ Rear wall

13‧‧‧ Zhoubi

14‧‧‧ next door

14a‧‧‧Connecting port

20‧‧‧The first piston part

20a‧‧‧The first contact part

21‧‧‧ 1st piston

22‧‧‧ Output shaft

23‧‧‧Column insertion part

23a‧‧‧Release recess

24‧‧‧ Rear shaft

30‧‧‧The second piston part

30a‧‧‧The second contact part

30b‧‧‧ Rear shaft insertion hole

31‧‧‧ 2nd Piston

32‧‧‧Sleeve part

A ₁ ‧‧‧ is located on the front side of the first piston in the first cylinder chamber

A ₂ ‧‧‧ located in the area behind the first piston in the first cylinder chamber

A ₃ ‧‧‧ is located on the front side of the second piston in the second cylinder chamber

A ₄ ‧‧‧ located in the area behind the second piston in the second cylinder chamber

C ₁ ‧‧‧ Flow path connecting area A ₁ and port P ₁

C ₂ ‧‧‧ Flow path connecting area A ₂ and port P ₂

C ₃ ‧‧‧ Flow path connecting area A ₃ and port P ₃

C ₄ ‧‧‧ Flow path connecting area A ₄ and port P ₄

L ₁ ‧‧‧ Centerline of fluid pressure cylinder

P ₁ ‧‧‧ port of flow path C ₁

P ₂ ‧‧‧ port of flow channel C ₂

P ₃ ‧‧‧ port of flow channel C ₃

P ₄ ‧‧‧ port of C ₄

S ₁ ‧‧‧The stroke range of the first piston member when the second piston member is located at the forward end of the second cylinder chamber

S ₂ ‧‧‧The stroke range of the first piston part when the second piston part is located at the rear end of the second cylinder chamber

FIG 1 is a shows a conventional fluid pressure cylinder containing sectional view showing a state in which the center line L ₁ of the cut plane.

FIG 2 shows a fluid pressure cylinder is an embodiment of the present invention comprising a cross-sectional view of a state after the center line L ₁ of the cut plane, wherein the second piston member located at the forward end of the second cylinder chamber, a first 1 The piston member is located at the forward end in the first cylinder chamber.

3 is a cross-sectional view showing a state in which the fluid pressure cylinder according to the embodiment of the present invention is cut by a plane including its center line L ₁ , in which the second piston member is located at the forward end in the second cylinder chamber. 1 The piston member retracts to a position where the first abutting portion and the second abutting portion abut.

4 is a cross-sectional view showing a state in which the fluid pressure cylinder according to the embodiment of the present invention is cut by a plane including its center line L ₁ , in which the second piston member is located at the retreating end in the second cylinder chamber. 1 The piston member is located at the retreating end in the first cylinder chamber.

The preferred embodiment of the fluid pressure cylinder of the present invention will be described in detail using the drawings. 2 to FIG. 4 is a fluid pressure cylinder according to the present invention comprises a cross-sectional view showing a state in which the center line L ₁ of the cut plane. FIG. 2 is a diagram showing that the second piston member 30 is located at the advancing end in the second cylinder chamber 10b and the first piston member 20 is located at the advancing end in the first cylinder chamber 10a. FIG. 3 is a diagram showing the second piston member 30 located at the forward end of the second cylinder chamber 10 b and the first piston member 20 retracted to the position where the first contact portion 20 a and the second contact portion 30 a contact. FIG. 4 is a diagram showing a case where the second piston member 30 is located at the retreating end in the second cylinder chamber 10b and the first piston member 20 is located at the retreating end in the first cylinder chamber 10a.

As shown in FIGS. 2 to 4, the fluid pressure cylinder of this embodiment includes a cylinder 10, a first piston member 20, and a second piston member 30. Hereinafter, each component constituting the fluid pressure cylinder of this embodiment will be described in order.

1. Cylinder

The cylinder 10 is a hollow cylindrical member, and its internal space is partitioned by the partition wall 14 into a first cylinder chamber 10a located on the front side and a second cylinder chamber 10b located on the rear side. In the central portion of the partition wall 14, a communication port 14a communicating the first cylinder chamber 10a and the second cylinder chamber 10b is provided. In the fluid pressure cylinder according to this embodiment, the cylinder 10 is composed of the front wall portion 11 forming the front side portion thereof, the rear wall portion 12 forming the rear side portion thereof, and the connecting front wall portion 11 and the rear wall portion 12 The cylindrical peripheral wall portion 13 is configured in combination. The partition wall 14 is provided in a flange shape from the inner peripheral portion of the peripheral wall portion 13.

Provided connecting the first cylinder chamber 10a in the cylinder 10 area A ₁ and a port (Port) P channel C ₁ is _1, connected to the first cylinder chamber 10a in the area A ₂ and the port P channel ₂ C ₂ , region of the connection of the second cylinder chamber 10b and a port P a _{3 3} C ₃ channel region connecting the second cylinder chamber 10b and the ports a _{4 4} P channel C _4. Wherein, the area A ₁ refers to an area located on the front side of the first piston 21 in the first cylinder chamber 10 a; the area A ₂ refers to an area located on the rear side of the first piston 21 in the first cylinder chamber 10 a; The area A ₃ refers to an area located on the front side of the second piston 31 in the second cylinder chamber 10b; the area A ₄ refers to an area located on the rear side of the second piston 31 in the second cylinder chamber 10b. The area A ₁ corresponds to the first area, the area A ₂ corresponds to the second area, the area A ₃ corresponds to the third area, and the area A ₄ corresponds to the fourth area.

Among the ports P ₁ , P ₂ , P ₃ , and P ₄ , the ports P ₁ , P ₂ , and P ₄ pass through a switching valve and a fluid pressure supply source (not shown in the fluid pressure cylinder of this embodiment) Pressure supply source) connection. Safety valves V ₁ , V ₂ , and V ₄ are provided in the flow paths C ₁ , C ₂ , and C ₄ , respectively. Valve V1 is configured to open when the supply of fluid from the pressure port P ₁ and the fluid pressure is not supplied to the port P ₁ and the fluid pressure supplied to the port P _2. The safety valve V _{2 is} configured to open when fluid pressure is supplied from the port P ₂ and fluid pressure is not supplied to the port P _{2 but is} supplied to the port P ₁ . The safety valve V _{4 is} configured to open when fluid pressure is supplied from the port P ₄ and fluid pressure is not supplied to the port P _{4 but is} supplied to the port P ₅ . The port P ₅ is a port dedicated for opening the safety valve V ₄ , which is the same as the ports P ₁ , P ₂ , and P ₄ , and is connected to the fluid pressure supply source through a switching valve (not shown). Thereby, the areas A ₁ and A _{2 of the} first cylinder chamber 10 a and the area A _{4 of} the second cylinder chamber 10 b can supply or discharge the fluid pressure (the hydraulic pressure in the fluid pressure cylinder of the present embodiment). When the fluid pressure is not supplied to the ports P ₁ , P ₂ , P ₄ , and P ₅ , the area is sealed to position the fluid pressure of the area corresponding to the port. On the other hand, the port P ₃ is open to the outside air. Thus, the area A _{3 of} the second cylinder chamber 10b is maintained in a state where the external air pressure is maintained. In addition, in the embodiment, although the configuration in which the area A ₃ maintains the external air pressure has been described, it is not limited to this, and may be a predetermined pressure other than the external air pressure. In addition, the pressure in the area A ₃ may vary.

2. The first piston part

In the fluid pressure cylinder of this embodiment, the first piston member 20 includes the first piston 21, the output shaft portion 22, the cylindrical insertion portion 23, and the rear shaft portion 24.

The first piston 21 is a flange-shaped portion housed in the first cylinder chamber 10a, and is a portion that divides the first cylinder chamber 10a into a region A ₁ and a region A ₂ and receives pressure from the regions A ₁ and A ₂ . That is, when the fluid pressure is supplied to the area A ₁ and the pressure in the area A ₁ is higher than the pressure in the area A ₂ , the pressure applied to the front side of the first piston 21 from the fluid supplied to the area A ₁ causes the first piston 21 moves backward into the first cylinder chamber 10a, and the first piston member 20 also moves backward. The first piston member 20 can also retreat by discharging the fluid pressure from the area A2. On the other hand, when the fluid pressure is supplied to the area A ₂ so that the pressure in the area A ₂ is higher than the pressure in the area A ₁ , the pressure applied to the rear surface side of the first piston 21 from the fluid supplied to the area A ₂ The piston 21 enters the first cylinder chamber 10a, and at the same time, the first piston member 20 also advances. The first piston member 20 can be advanced through a fluid pressure is discharged from the area A _1. Thereby, by switching the pressure in the area A ₁ and the area A ₂ , the output shaft portion 22 of the first piston member 20 can be moved in the front-rear direction.

The output shaft portion 22 is provided so as to protrude forward from the center portion of the front surface of the first piston 21, and the front end side protrudes forward from the front end surface of the cylinder 10. The output shaft portion 22 is a portion that outputs the operation of the first piston member 20 to the outside of the cylinder 10. When assembling the fluid pressure cylinder of this embodiment to a work holding device, the front end side of the output shaft portion 22 is connected to a wedge plunger housed inside the chuck through a drawing tube or plunger, etc. moves back and forth direction of the output shaft section 22 is converted into movement in a direction perpendicular thereto (the center line L ₁ is the center of the radial direction) on, and executed using the chuck jaw operation. Further, when the fluid pressure cylinder according to the present embodiment is assembled to the workpiece gripping means, not shown by the rotation drive mechanism (motor or the like), and the cylinder 10 is formed around the center line L ₁ may be configured to rotate, to make the The chuck portion can also rotate around the center line L ₁ .

The columnar insertion portion 23 is a columnar portion provided to protrude rearward from the central portion of the rear surface of the first piston 21. The columnar insertion portion 23 is formed as a portion that is inserted into the communication port 14a of the partition wall 14 and slidingly contacts the inner peripheral surface of the communication port 14a and moves in the front-rear direction (moves integrally with the first piston 21). Thereby, even if the first piston member 20 is moved in the front-rear direction, the outer peripheral surface of the cylindrical insertion portion 23 can maintain the state of contact with the inner peripheral surface of the communication port 14a, and therefore, the area A of the first cylinder chamber 10a ₂ and the area A _{3 of} the second cylinder chamber 10b do not communicate with each other. In other words, the cylindrical insertion portion 23 has a function as a plug of the communication port 14a.

The first abutting portion 20 a is annularly provided on the peripheral portion of the rear end surface of the columnar insertion portion 23. In addition, the peripheral part of the rear end surface of the cylindrical insertion part 23 corresponds to the rear end part of the cylindrical insertion part. The first contact portion 20a is a portion for contacting with the second contact portion 30a of the second piston member 30 described later. In addition, a release recess 23a is provided in the center of the rear end surface of the cylindrical insertion portion 23. As shown in FIG. 3, when the first contact portion 20a abuts on the second contact portion 30a, the release recess 23a is a portion for releasing the sleeve portion 32, so that the sleeve portion of the second piston member 30 32 does not interfere with the cylindrical insertion portion 23 of the first piston member 20. The release recess 23a can suppress the front-rear length of the cylinder 10 and increase the rigidity of the cylinder 10.

In the embodiment, the cylindrical insertion portion 23 is provided on the rear surface side of the first piston 21, and the rear end portion of the cylindrical insertion portion 23 is the first contact portion 20 a. As a result, the embodiment can simplify the structures of the first piston member 20 and the second piston member 30.

The rear shaft portion 24 is provided so as to protrude rearward from the central portion of the rear surface of the first piston 21 (the central portion of the rear surface of the cylindrical insertion portion 23 in the fluid pressure cylinder of the present embodiment). The rear shaft portion 24 extends from the rear end surface of the cylinder tube 10 to the protruding position through the second cylinder chamber 10b. As a result, the first piston member 20 is stabilized in the cylinder 10. As described later, the rear shaft portion 24 also serves as a guide for the second piston member 30.

3. The second piston part

In the fluid pressure cylinder of this embodiment, the second piston member 30 includes the second piston 31 and the sleeve portion 32.

The second piston 31 is a flange-shaped portion housed in the second cylinder chamber 10b, and divides the second cylinder chamber 10b into a region A ₃ and a region A ₄ , and receives the pressure of the region A ₄ . That is, when the pressure in the area A ₄ is higher than the pressure in the area A ₃ (external air pressure), the pressure applied from the fluid supplied to the area A ₄ to the rear surface side of the second piston 31 causes the second piston 31 to enter the second In the cylinder chamber 10b, the second piston member 30 also advances.

When the pressure in the area A ₃ can be higher than the pressure in the area A ₄ , the second piston member 30 can be retracted. However, as described above, in the fluid pressure cylinder of the present embodiment, the area A ₃ is connected to the outside. Since the air is open, the pressure in the area A ₃ cannot be higher than the external air pressure, that is, it is not a structure capable of retreating the second piston member 30 by increasing the pressure in the area A ₃ . In this regard, in the fluid pressure cylinder of the present embodiment, when the fluid pressure in the region A ₄ of the second cylinder chamber 10b is discharged and the pressure is reduced, if the pressure in the region A ₁ of the first cylinder chamber 10a is increased, the first piston member 20 retreats, the first abutting portion 20a of the first piston member 20 abuts the second abutting portion 30a described later, and the first piston member 20 pushes the second piston member 30 backward, so that the second The piston member 30 is retracted.

The sleeve portion 32 is provided so as to protrude forward from the center of the front surface of the second piston 31. The central portion of the second piston 31 and the sleeve portion 32 is provided with a rear shaft portion insertion hole 30b, and the rear shaft portion 24 of the first piston member 20 is inserted into the rear shaft portion insertion hole 30b. Thus, the second piston member 30 can slide stably in the front-rear direction in the second cylinder chamber 10b through the rear shaft portion 24. In addition, when the first piston member 20 moves in the front-rear direction, the rear shaft portion 24 of the first piston member 20 can slide stably through the inner peripheral surface in the rear shaft portion insertion hole 30b. An annular second contact portion 30a is provided near the root of the sleeve portion 32 on the front surface of the second piston 31.

As described above, the second abutment portion 30a is applied to the portion that abuts the first abutment portion 20a of the first piston member 20. When the second piston member 30 is in a state where it cannot move rearward (the state in which the pressure in the region A ₄ of the second cylinder chamber 10b is increased, or the second piston member 30 is in the state of the retracted end in the second cylinder chamber 10b), When the first piston member 20 is retracted and the first abutting portion 20a of the first piston member 20 abuts on the second abutting portion 30a, the first piston member 20 is in a state where it cannot move further rearward. Thus, when the pressure in the region A ₄ of the second cylinder chamber 10b is increased to form a state where the second piston member 30 moves toward the forward end in the second cylinder chamber 10b, the stroke range of the first piston member 20 can be shortened to As shown in the stroke range S ₁ in FIG. 3. In the workpiece holding means (gripper Changer by replaceable workpiece gripping jaw apparatus), the normal stroke range S of the stroke range as _a gripping piece.

When the second piston member 30 is in a state where it can move rearward (the second piston member 30 is located in a forward position from the retreating end in the second cylinder chamber 10b, and the pressure in the area A ₄ of the second cylinder chamber 10b is low ), the pressure in the area A ₁ of the first cylinder chamber 10a is increased to retreat the first piston member 20. When the first abutting portion 20a of the first piston member 20 abuts on the second abutting portion 30a, the second piston The member 30 is pushed rearward by the first piston member 20 and moves rearward. When the second piston member 30 is located at the retreating end in the second cylinder chamber 10b, the stroke range of the first piston member 20 can be extended to the stroke range S ₂ in FIG. 4. In the above-mentioned workpiece gripping device (workpiece gripping device capable of exchanging the jaws by the automatic jaw replacement device), this stroke range S ₂ can be used as the stroke range when the jaws are replaced.

4. Summary

As described above, in the fluid pressure cylinder of the present embodiment, by moving the second piston member 30 in the front-rear direction and changing the front-rear position of the second contact portion 30a that restricts the movement of the first piston member 20 to the rear, it is possible to adjust the second 1 The stroke range of the piston member 20. In addition, the fluid pressure cylinder of the present embodiment allows the second abutting portion 30a to enter the area A _{2 of the} first cylinder chamber 10a, instead of allowing the first abutting portion 20a and the second abutting portion 30a to abut The first contact portion 20a enters the area A _{3 of} the second cylinder chamber 10b to contact the first contact portion 20a and the second contact portion 30a.

Thus, in the fluid pressure cylinder of the present embodiment, even if the second cylinder is raised by increasing the pressure in the area A ₂ of the first cylinder chamber 10a to the set value and moving the first piston member 20 to the forward end The pressure in the area A ₄ of the chamber 10b advances the second piston member 30, and the pressure in the area A ₂ can still be maintained at the above-mentioned set value. Therefore, the cylinder 10, the first piston member 20, and the like are not easily deformed, and the fluid pressure cylinder is less likely to malfunction. In addition, when the first piston member 20 is retracted, the first contact portion 20a enters the area A _{3 of} the second cylinder chamber 10b, and the area A ₃ is open to the outside air, so that the pressure of the area A ₃ can be maintained at the outside air pressure nearby. Therefore, in the fluid pressure cylinder of the present embodiment, the structure is not limited to the area A ₂ , and the pressure in other areas such as the area A ₃ does not exceed the set value, so that failures are less likely to occur.

In contrast to this, in the conventional fluid pressure cylinder, as described below, the pressure in the area A ₂ is likely to increase.

When the fluid is compressible fluid such as air, shown in Figure 1, the second piston member 30 along the forward portion of the sleeve 32 enters into the region A _2, thereby resulting in reducing the apparent volume area A _2, A ₂ is area The pressure rises. In addition, when the fluid supplied to the fluid pressure cylinder is an incompressible fluid such as oil, the pressure in the area A ₂ increases. That is, when the area of the front end surface (second contact portion 30a) of the sleeve portion 32 is S _A , the pressure in the area A ₂ is P _A , and the area of the rear surface of the second piston 31 (from the area A ₄ The area of the pressure-bearing portion of the fluid is S _B , and the pressure in the area A ₄ is P _B , which forms P _A according to the Pascal principle. S _A =P _B. S _B relationship, this time, since the front end surface of the sleeve portion 32 of the area of the area S _B S _A rear surface of the second piston 31 is very small compared to the pressure area A ₂ of the region is much higher than P _A A ₄ the pressure P _B.

In the fluid pressure cylinder of the present invention, the fluid supplied to the areas A ₁ and A _{2 of the} first cylinder chamber 10 a or the area A ₄ of the second cylinder chamber 10 b is not particularly limited, and may be gas (air, etc.), but Liquid is preferred. In this way, a large driving force can be output from the output shaft portion 22 of the first piston member 20. On the other hand, in the case of supplying liquid, compared with the case of supplying gas, the pressure in the area A ₂ and the like is less likely to increase, and the cylinder 10 or the first piston member 20 is less likely to be deformed, so the fluid pressure cylinder constituting the present invention is used The importance of the constituents involved has increased. As the liquid supplied to the regions A ₁ , A ₂ , and A ₃ , oil or the like is preferable.

10‧‧‧Cylinder

10a‧‧‧1st cylinder room

10b‧‧‧Cylinder room 2

14‧‧‧ next door

14a‧‧‧Connecting port

20‧‧‧The first piston part

20a‧‧‧The first contact part

21‧‧‧ 1st piston

22‧‧‧ Output shaft

24‧‧‧ Rear shaft

30‧‧‧The second piston part

30a‧‧‧The second contact part

30b‧‧‧ Rear shaft insertion hole

32‧‧‧Sleeve part

A1‧‧‧ Located in the area on the front side of the first piston in the first cylinder chamber

A2‧‧‧ Located in the area behind the first piston in the first cylinder chamber

A3‧‧‧ Located on the front side of the second piston in the second cylinder chamber

A4‧‧‧ Located in the area behind the second piston in the second cylinder chamber

Claims (7)

A fluid pressure cylinder includes a cylinder, a first piston member, and a second piston member, wherein, The cylinder includes a first cylinder chamber, a second cylinder chamber, and a partition wall, The partition wall is provided to separate the first cylinder chamber and the second cylinder chamber, and a communication port is formed, The second cylinder chamber is arranged behind the first cylinder chamber, The first piston member has a first piston and a first abutting portion, and divides the first cylinder chamber into a first area and a second area, The second piston member has a second piston and a second abutting portion, and divides the second cylinder chamber into a third area and a fourth area, The first piston is accommodated in the first cylinder chamber, and the second piston is accommodated in the second cylinder chamber, The first region is located on the front side of the first piston, the second region is located on the rear side of the first piston, the third region is located on the front side of the second piston, and the fourth region is located on the rear side of the second piston. The first contact portion is provided on the rear surface side of the first piston, and is configured to be able to enter the third area through the communication port of the partition wall to contact the second contact portion, The second abutting portion is provided on the front surface side of the second piston, and is configured to restrict the first piston member from moving backward when abutting the first abutting portion. The fluid pressure cylinder according to claim 1, wherein, The first piston member further has a cylindrical insertion portion, The columnar insertion portion is provided on the rear surface side of the first piston, and is slidably in contact with the inner peripheral surface of the communication port and movable in the front-rear direction, and is inserted into the communication port, and the The rear end portion of the columnar insertion portion is formed as a first contact portion. The fluid pressure cylinder according to claim 2, wherein, The first piston member further has a rear shaft portion and a release recess, The second piston member further has a rear shaft insertion hole and a sleeve portion, The rear shaft portion is provided so as to penetrate the second cylinder chamber in the front-rear direction, and is provided to protrude rearward from the rear surface side of the first piston, The rear shaft portion insertion hole is inserted through the rear shaft portion, The sleeve portion is provided on the front surface side of the second piston member where the rear shaft portion insertion hole is provided, The release concave portion is provided on the rear surface side of the columnar insertion portion, and is configured to release the sleeve portion when the first abutting portion and the second abutting portion abut. The fluid pressure cylinder according to any one of claim 1 to claim 3, wherein The second contact portion is configured not to enter the second area through the communication port of the partition wall. The fluid pressure cylinder according to any one of claim 1 to claim 3, wherein The first piston member retreats when the pressure in the first region is higher than the pressure in the second region, and the pressure in the second region is higher than the pressure in the first region. The second piston member retreats when the pressure in the third zone is higher than the pressure in the fourth zone, and advances when the pressure in the fourth zone is higher than the pressure in the third zone. The fluid pressure cylinder according to any one of claim 1 to claim 3, wherein the third region is external air pressure. The fluid pressure cylinder according to any one of claim 1 to claim 3, wherein The stroke range of the first piston member is adjusted by the change of the front-rear position of the second piston member.

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