JP2018009593A - Fluid pressure cylinder - Google Patents

Abstract

A fluid pressure cylinder capable of holding a position of a piston rod for a long time is provided. A hydraulic cylinder 100 includes a piston rod 3 that is connected to one side surface 2a of the piston 2 and linearly moves together with the piston 2, and a lock device 10 that holds the position of the piston 2. The lock device 10 includes: A rod-shaped member 11 connected to the other side surface 2b of the piston 2 and linearly moving together with the piston 2, and a pinion 13 supported by the rotating shaft 12 and converting the linear motion of the rod-shaped member 11 into rotating motion. Alternatively, the position of the piston 2 is held by locking the pinion 13. [Selection] Figure 1

Description

  The present invention relates to a fluid pressure cylinder.

  Patent Document 1 describes a fluid pressure cylinder driven by fluid pressure.

JP 2000-130408 A

  In the fluid pressure cylinder described in Patent Document 1, the position of the piston rod can be held at an arbitrary position by a control valve that supplies and discharges the working fluid. However, since the working fluid may leak from the control valve, it is difficult to maintain the position of the piston rod for a long time. Although it is possible to provide a check valve in the flow path for supplying and discharging the working fluid, it is not possible to completely prevent the working fluid from leaking even with the check valve. It was difficult to maintain the position.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluid pressure cylinder that can hold the position of a piston rod for a long time.

  A first invention includes a cylinder tube, a piston slidably accommodated in the cylinder tube, linearly moving in the cylinder tube, a piston rod connected to one side surface of the piston and linearly moving together with the piston, and a position of the piston And a locking device that is connected to the other side surface of the piston and linearly moves together with the piston, and a rotating body that is supported by the rotating shaft and converts the linear motion of the rod-shaped member into rotational motion. The position of the piston is maintained by locking the rotating shaft or the rotating body.

  In the first invention, the position of the piston and the piston rod connected to the piston is maintained by locking the rotating shaft or the rotating body by the locking device.

  The second invention is characterized in that the locking device presses the outer peripheral surface of the rotating shaft.

  According to a third aspect of the present invention, the lock device further includes a lock cylinder provided coaxially with the rotation shaft. The lock cylinder is slidably received in the housing, and the first working chamber and the second chamber are accommodated in the housing. A lock piston that is partitioned into a working chamber, a lock member that is connected to the lock piston and moves along the outer peripheral surface of the rotating shaft, and a bias that is housed in the first working chamber and biases the lock piston toward the second working chamber. And a pressing member that converts the urging force of the urging portion that acts on the lock member in the axial direction of the rotation shaft via the lock piston into the radial direction of the rotation shaft, and presses the lock member against the outer peripheral surface of the rotation shaft A fluid supply port that is formed in the housing and guides the fluid to the second working chamber, and the lock piston resists the biasing force of the biasing portion by guiding the fluid to the second working chamber through the fluid supply port. do it Wherein the pressing of the locking member is released by moving.

  In the second and third inventions, the rotation shaft can be mechanically locked by the locking device, so that the position of the piston rod can be maintained for a long time.

  According to a fourth aspect of the invention, the lock device presses a side surface of the rotating body.

  According to a fifth aspect of the present invention, the lock device includes a lock cylinder provided coaxially with the rotation shaft. The lock cylinder is slidably received in the housing, and the first working chamber and the second operation are accommodated in the housing. A lock piston that is partitioned into a chamber, a biasing portion that is housed in the first working chamber and biases the lock piston in a direction of pressing the lock piston against the side surface of the rotating body, and is formed in the housing and guides fluid to the second working chamber. A fluid supply port, and the fluid is guided to the second working chamber through the fluid supply port, so that the lock piston moves against the urging force of the urging portion to release the pressure of the lock piston. It is characterized by that.

  In the fourth and fifth inventions, since the rotating body can be mechanically locked by the locking device, the position of the piston rod can be maintained for a long time.

  According to the fluid pressure cylinder of the present invention, the position of the piston rod can be maintained for a long time.

It is a conceptual diagram in the axial direction of the fluid pressure cylinder which concerns on 1st Embodiment of this invention. It is sectional drawing in the axial direction of the locking device which concerns on 1st Embodiment of this invention. It is sectional drawing in the axial direction of the locking device which concerns on 2nd Embodiment of this invention.

<First Embodiment>
The first embodiment of the present invention will be described below with reference to FIGS. Here, the fluid pressure cylinder is described as a hydraulic cylinder in which water is used as a working fluid. However, the fluid pressure cylinder uses other liquid such as hydraulic oil, gas such as air or nitrogen, etc. as the working fluid. There may be.

  First, the structure of the hydraulic cylinder 100 according to the first embodiment will be described. The hydraulic cylinder 100 is mounted on a food processing apparatus or the like.

  As shown in FIG. 1, a hydraulic cylinder 100 includes a cylindrical cylinder tube 1, a piston 2 that is slidably received in the cylinder tube 1 and linearly moves in the cylinder tube 1, and one side surface 2 a of the piston 2. And a piston rod 3 that moves linearly together with the piston 2 and a lock device 10 that holds the position of the piston 2. The piston rod 3 has one end connected to the piston 2 and the other end extending to the outside of the cylinder tube 1 and connected to a member or device (not shown).

  The piston 2 partitions the inside of the cylinder tube 1 into a rod side chamber 1a and an anti-rod side chamber 1b. When water discharged from the pump P is supplied to the rod side chamber 1a through the control valve V, the piston 2 and the piston rod 3 move in a direction (left direction in FIG. 1) to reduce the anti-rod side chamber 1b, and the hydraulic cylinder 100 Operates in contraction. At this time, the water in the non-rod side chamber 1b is discharged to the tank T through the control valve V. On the other hand, when the water discharged from the pump P is supplied to the anti-rod side chamber 1b through the control valve V, the piston 2 and the piston rod 3 move in the direction of reducing the rod side chamber 1a (right direction in FIG. 1). Then, the hydraulic cylinder 100 is extended. At this time, the water in the rod side chamber 1a is discharged to the tank T through the control valve V.

  The locking device 10 is connected to the other side surface 2b of the piston 2 and linearly moves with the piston 2, and a pinion 13 as a rotating body that is supported by the rotary shaft 12 and converts the linear motion of the rod-shaped member 11 into rotational motion. And a lock cylinder 20 (see FIG. 2) provided coaxially with the rotary shaft 12. The rod-shaped member 11, the rotating shaft 12, and the pinion 13 are accommodated in the housing 21.

  One end of the rod-shaped member 11 passes through the housing 21 and the cylinder tube 1 and is connected to the other side surface 2 b of the piston 2. A rack portion 11 a that meshes with the gear portion of the pinion 13 is formed on the outer peripheral surface of the rod-shaped member 11. A rack and pinion mechanism that converts linear motion into rotational motion is configured by the rack portion 11 a of the rod-shaped member 11 and the gear portion of the pinion 13.

  As shown in FIG. 2, the lock cylinder 20 is slidably accommodated in a housing 21 and is coupled to the lock piston 22 and the lock piston 22 that divide the housing 21 into a first working chamber 21 a and a second working chamber 21 b. A lock member 23 that moves along the outer peripheral surface 12a of the rotary shaft 12, a spring 24 that is housed in the first working chamber 21a and that urges the lock piston 22 toward the second working chamber 21b, and a lock When the member 23 abuts, the urging force of the spring 24 acting on the lock member 23 in the axial direction of the rotary shaft 12 via the lock piston 22 is converted into the radial direction of the rotary shaft 12, and the lock member 23 is rotated. 12 is provided with a pressing member 25 that presses the outer peripheral surface 12a, and a fluid supply port 21c that is formed in the housing 21 and guides fluid to the second working chamber 21b. The lock piston 22 is provided with a seal member 30 that seals between the outer peripheral surface of the lock piston 22 and the inner peripheral surface of the housing 21. The fluid supplied to the second working chamber 21b may be water supplied to the rod side chamber 1a and the anti-rod side chamber 1b, or may be different types of fluid such as hydraulic oil or gas.

  The housing 21 is provided with a pair of bearings 27 that support the rotating shaft 12. The housing 21 is provided with a guide member 26 that is in sliding contact with the outer peripheral surface of the lock member 23 and guides the axial movement of the lock member 23. The lock member 23 is inserted through a through hole 26 a provided in the guide member 26. The guide member 26 is provided with a seal member 31 that seals between the outer peripheral surface of the lock member 23 and the inner peripheral surface of the through hole 26a.

  The lock member 23 is formed of a cylindrical member. The rotary shaft 12 is movably inserted into the lock member 23. A tapered surface 23b is formed on the outer periphery of the distal end portion 23a of the lock member 23 such that the outer diameter decreases toward the distal end. A slit (not shown) extending in the axial direction from the end surface is formed at the distal end portion 23 a of the lock member 23. Thereby, the front-end | tip part 23a of the lock member 23 can be elastically deformed to radial direction.

  The pressing member 25 includes a through hole 25a through which the rotary shaft 12 is inserted. A contact portion 25b that contacts the tapered surface 23b of the lock member 23 is provided at an end portion of the through hole 25a that faces the lock member 23.

  Next, the operation of the locking device 10 will be described.

  First, the case where the rotating shaft 12 is locked by the locking device 10 will be described. In this case, the fluid in the second working chamber 21b is discharged through the fluid supply port 21c. Thereby, the lock member 23 is moved toward the pressing member 25 (right direction in FIG. 2) together with the lock piston 22 by the urging force of the spring 24. When the tapered surface 23b of the lock member 23 comes into contact with the contact portion 25b of the pressing member 25, the distal end portion 23a of the lock member 23 is deformed radially inward due to the wedge effect. Thereby, the front-end | tip part 23a of the lock member 23 is pressed by the outer peripheral surface 12a of the rotating shaft 12, and the rotating shaft 12 is locked.

  Next, a case where the lock of the rotating shaft 12 by the lock device 10 is released will be described. In this case, the fluid is supplied into the second working chamber 21b through the fluid supply port 21c. As a result, the lock piston 22 moves toward the first working chamber 21a (leftward in FIG. 2) together with the lock member 23 against the urging force of the spring 24. When the distal end portion 23a of the lock member 23 is separated from the contact portion 25b of the pressing member 25, the distal end portion 23a of the lock member 23 is released from the pressed state and returns to its original shape. Thereby, the lock | rock of the rotating shaft 12 is cancelled | released.

  The operation of the hydraulic cylinder 100 configured as described above will be described.

  By switching the control valve V, when the water discharged from the pump P is supplied to the rod side chamber 1a or the anti-rod side chamber 1b through the control valve V, the piston 2 moves together with the piston rod 3 and the rod-shaped member 11. The linear motion of the rod-shaped member 11 is converted into the rotational movement of the pinion 13. At this time, when the rotating shaft 12 is locked by the locking device 10, the pinion 13 supported by the rotating shaft 12, the rod-shaped member 11 engaged with the pinion 13, the piston 2 connected to the rod-shaped member 11, and the piston The movement of the piston rod 3 connected to 2 is restricted. That is, in the state where the rotating shaft 12 is locked by the locking device 10, the movement of the piston 2 and the piston rod 3 is restricted, so that the positions are maintained.

  Further, when the locked state of the rotating shaft 12 by the locking device 10 is released as described above, the rotating shaft 12 is allowed to rotate, so that the rotational motion of the pinion 13 and the linear motion of the rod-shaped member 11 are also allowed. . Therefore, linear movement of the piston 2 and the piston rod 3 is allowed, and the piston 2 and the piston rod 3 are driven according to the operation of the control valve V.

  As described above, the position of the piston 2 and the piston rod 3 can be maintained by locking the rotating shaft 12 by the locking device 10 and the fluid is guided to the second working chamber 21b through the fluid supply port 21c. The pressing of the member 23 is released, and the piston 2 and the piston rod 3 can be moved.

  According to the above 1st Embodiment, there exist the following effects.

  In the hydraulic cylinder 100, the position of the piston rod 3 is held by mechanically locking the rotating shaft 12 by the locking device 10, and therefore the position of the piston rod 3 can be held for a long time.

Second Embodiment
With reference to FIG. 3, the hydraulic cylinder 200 which concerns on 2nd Embodiment of this invention is demonstrated. Below, it demonstrates centering on a different point from 1st Embodiment mentioned above, the same code | symbol is attached | subjected to the structure same as 1st Embodiment, and description is abbreviate | omitted.

  The hydraulic cylinder 100 of the first embodiment includes the lock device 10 in which the lock member 23 presses the outer peripheral surface 12a of the rotating shaft 12, whereas the hydraulic cylinder 200 of the second embodiment has the lock pistons 122A and 122B having the pinion 13. It differs in that a locking device 50 is provided to press the side surfaces 13A and 13B. This will be specifically described below.

  The lock device 50 includes two lock cylinders 120 </ b> A and 120 </ b> B provided coaxially with the rotary shaft 12. Since the lock cylinder 120A and the lock cylinder 120B have the same configuration, the following description will focus on the lock cylinder 120A. The lock cylinder 120B has the same reference numeral in the drawing for the same configuration as the lock cylinder 120A. A description thereof will be omitted. The configuration of the lock cylinder 120A is identified by “A”, and the configuration of the lock cylinder 120B is identified by “B”.

  The lock cylinder 120A is housed in the housing 121, is slidably accommodated in the housing 121, and is divided into the first working chamber 121A and the second working chamber 130, and the first working chamber 121A. A spring 24A as an urging portion for urging the lock piston 122A in a direction in which the piston 122A is pressed against the side surface 13A of the pinion 13, and a fluid supply port 121C that is formed in the housing 121 and guides the fluid to the second working chamber 130 .

  The lock piston 122A is formed in an annular shape. The rotary shaft 12 is inserted through the lock piston 122A. The lock piston 122A seals between the outer peripheral surface of the lock piston 122A and the inner peripheral surface of the housing 121, and seals between the inner peripheral surface of the lock piston 122A and the outer peripheral surface 12a of the rotary shaft 12. A sealing member 32A is provided.

  The second working chamber 130 is partitioned by the housing 121 and the lock pistons 122A and 122B. The second working chamber 130 accommodates the rod-shaped member 11 and the pinion 13. Even if the fluid supplied to the second working chamber 130 through the fluid supply port 121C is water supplied to the rod side chamber 1a and the anti-rod side chamber 1b as in the first embodiment, different types of fluid such as hydraulic oil and gas are used. It may be a thing.

  Next, the operation of the locking device 50 will be described.

  First, the case where the pinion 13 is locked by the locking device 50 will be described. In this case, the fluid in the second working chamber 130 is discharged through the fluid supply port 121C. Thereby, lock piston 122A, 122B moves toward the pinion 13 with the urging | biasing force of spring 24A, 24B. When the lock pistons 122A and 122B abut against the side surfaces 13A and 13B of the pinion 13, and the lock pistons 122A and 122B are pressed against the side surfaces 13A and 13B of the pinion 13 by the urging force of the springs 24A and 24B, the pinion 13 is locked. Is done.

  Next, a case where the lock of the pinion 13 by the lock device 50 is released will be described. In this case, the fluid is supplied into the second working chamber 130 through the fluid supply port 121C. Thereby, the lock pistons 122A and 122B move away from the pinion 13 against the urging force of the springs 24A and 24B. Accordingly, the pinion 13 is released from the pressed state by the lock pistons 122A and 122B. Accordingly, the lock of the pinion 13 is released.

  As described above, the position of the piston 2 and the piston rod 3 can be maintained by locking the pinion 13 by the locking device 50, and the fluid is guided to the second working chamber 130 through the fluid supply port 121C. The pressing of 122A and 122B is released, and the piston 2 and the piston rod 3 can be moved.

  In the above-described embodiment, the lock cylinders 120A and 120B are provided. However, only one of the lock cylinders 120A and 120B may be provided.

  Since the operations of the piston 2 and the piston rod 3 are the same as those in the first embodiment, the description thereof is omitted.

  According to the above 2nd Embodiment, there exist the following effects.

  In the hydraulic cylinder 200, the position of the piston rod 3 is held by mechanically locking the rotary shaft 12 by the lock device 50, so that the position of the piston rod 3 can be held for a long time.

  Hereinafter, the configuration, operation, and effect of the embodiment of the present invention will be described together.

  The fluid pressure cylinders (hydraulic cylinders 100 and 200) are slidably accommodated in the cylinder tube 1, the piston 2 that moves linearly in the cylinder tube 1, and one side surface 2a of the piston 2. A piston rod 3 that linearly moves together with the piston 2 and locking devices 10 and 50 that hold the position of the piston 2 are provided. The locking devices 10 and 50 are connected to the other side surface 2b of the piston 2 and linearly move together with the piston 2. And a rotating body (pinion 13) that is supported by the rotating shaft 12 and converts linear motion of the rod-shaped member 11 into rotating motion, and locks the rotating shaft 12 or the rotating body (pinion 13). The position of the piston 2 is maintained.

  According to this configuration, the position of the piston 2 and the piston rod 3 connected to the piston 2 is maintained by locking the rotating shaft 12 or the rotating body (pinion 13) by the locking devices 10 and 50.

  The fluid pressure cylinder (water pressure cylinder 100) is characterized in that the locking device 10 presses the outer peripheral surface 12a of the rotating shaft 12.

  In the fluid pressure cylinder (hydraulic cylinder 100), the lock device 10 further includes a lock cylinder 20 provided coaxially with the rotary shaft 12, and the lock cylinder 20 is slidably accommodated in the housing 21 and the housing 21. A lock piston 22 that divides the housing 21 into a first working chamber 21a and a second working chamber 21b, a lock member 23 that is connected to the lock piston 22 and moves along the outer peripheral surface 12a of the rotating shaft 12, and a first working chamber A biasing portion (spring 24) that is housed in 21a and biases the lock piston 22 toward the second working chamber 21b, and a biasing portion that acts on the lock member 23 in the axial direction of the rotary shaft 12 via the lock piston 22 A pressing member 25 that converts the biasing force of the (spring 24) in the radial direction of the rotary shaft 12 and presses the lock member 23 against the outer peripheral surface 12a of the rotary shaft 12, and a housing. And a fluid supply port 21c for guiding a fluid to the second working chamber 21b. The fluid piston 21 is provided with a biasing portion by guiding the fluid to the second working chamber 21b through the fluid supply port 21c. By moving against the biasing force of the (spring 24), the pressing of the lock member 23 is released.

  According to these structures, since the rotating shaft 12 can be mechanically locked by the locking device 10, the position of the piston rod 3 can be held for a long time.

  The fluid pressure cylinder (water pressure cylinder 200) is characterized in that the locking device 50 presses the side surfaces 13A and 13B of the rotating body (pinion 13).

  In the fluid pressure cylinder (hydraulic pressure cylinder 200), the lock device 50 further includes lock cylinders 120 </ b> A and 120 </ b> B provided coaxially with the rotary shaft 12, and the lock cylinders 120 </ b> A and 120 </ b> B slide on the housing 121 and the housing 121. Lock pistons 122A and 122B that are freely accommodated and divide the housing 121 into first working chambers 121A and 121B and a second working chamber 130, and are accommodated in the first working chambers 121A and 121B. Biasing portions (springs 24A, 24B) for urging the lock pistons 122A, 122B in a direction to be pressed against the side surfaces 13A, 13B of the pinion 13), and a fluid that is formed in the housing 121 and guides the fluid to the second working chamber 130 Supply port 121C, and through fluid supply port 121C 2 When the fluid is guided to the working chamber 130, the lock pistons 122 </ b> A and 122 </ b> B move against the biasing force of the biasing portions (springs 24 </ b> A and 24 </ b> B) to release the press of the lock pistons 122 </ b> A and 122 </ b> B. It is characterized by.

  According to this configuration, since the rotating body (pinion 13) can be mechanically locked by the locking device 50, the position of the piston rod 3 can be held for a long time.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  By supplying fluid to the first working chambers 21a, 121A, and 121B at the time of locking, in addition to the springs 24A and 24B, the lock pistons 22A, 122A, and 22B are driven by the pressure of the fluid supplied to the first working chambers 21a, 121A, and 121B. You may comprise so that 122B may be energized.

  The hydraulic cylinders 100 and 200 may be a double rod type. In this case, the rod-shaped member 11 may be protruded from the housing 21.

DESCRIPTION OF SYMBOLS 100, 200 ... Hydraulic cylinder (fluid pressure cylinder), 1 ... Cylinder tube, 2 ... Piston, 2a ... Side surface, 2b ... Side surface, 3 ... Piston rod, 10 ... Lock device, 11 ... rod-shaped member, 11a ... rack part, 12 ... rotating shaft, 12a ... outer peripheral surface, 13 ... pinion (rotary body), 13A ... side surface, 20 ... Lock cylinder, 21 ... housing, 21a ... first working chamber, 21b ... second working chamber, 21c ... fluid supply port, 22 ... lock piston, 23 ... lock member, 23a ... tip part, 23b ... taper surface, 24, 24A, 24B ... spring (biasing part), 25 ... pressing member, 25b ... contact part, 50 ... lock device , 120A, 120B... Lock cylinder, 121 ... housing, 121A, 121B ... first working chamber, 121C ... fluid supply port, 122A, 122B ... lock piston, 130 ... second operating chamber

Claims (5)

A cylinder tube;
A piston slidably accommodated in the cylinder tube and linearly moving in the cylinder tube;
A piston rod connected to one side of the piston and linearly moving with the piston;
A locking device for holding the position of the piston,
The locking device is
A rod-shaped member connected to the other side surface of the piston and linearly moving together with the piston;
A rotating body that is supported by a rotating shaft and converts linear motion of the rod-shaped member into rotational motion,
A fluid pressure cylinder characterized by holding the position of the piston by locking the rotating shaft or the rotating body.   The fluid pressure cylinder according to claim 1, wherein the locking device presses an outer peripheral surface of the rotating shaft. The lock device further includes a lock cylinder provided coaxially with the rotating shaft,
The lock cylinder is
A housing;
A lock piston that is slidably received in the housing and divides the housing into a first working chamber and a second working chamber;
A lock member connected to the lock piston and moving along an outer peripheral surface of the rotary shaft;
An urging portion that is accommodated in the first working chamber and urges the lock piston toward the second working chamber;
The urging force of the urging portion acting on the lock member in the axial direction of the rotation shaft is converted to the radial direction of the rotation shaft via the lock piston, and the lock member is pressed against the outer peripheral surface of the rotation shaft. A pressing member to
A fluid supply port formed in the housing for guiding fluid to the second working chamber,
When the fluid is guided to the second working chamber through the fluid supply port, the lock piston is released against the urging force of the urging portion, so that the pressing of the lock member is released. The fluid pressure cylinder according to claim 2.   The fluid pressure cylinder according to claim 1, wherein the locking device presses a side surface of the rotating body. The lock device further includes a lock cylinder provided coaxially with the rotating shaft,
The lock cylinder is
A housing;
A lock piston that is slidably received in the housing and divides the housing into a first working chamber and a second working chamber;
A biasing portion that is accommodated in the first working chamber and biases the lock piston in a direction of pressing the lock piston against a side surface of the rotating body;
A fluid supply port formed in the housing for guiding fluid to the second working chamber,
The fluid is guided to the second working chamber through the fluid supply port, so that the lock piston moves against the urging force of the urging portion, thereby releasing the lock piston. The fluid pressure cylinder according to claim 4.

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