JPH0578974U - Hydraulic rotary machine - Google Patents

Abstract

(57) [Summary] [Purpose] To visually check whether the lock mechanism is locked. [Structure] A hydraulic rotary machine having a cylinder block 3
The lock mechanism 21 is provided to face the recess 20 of the lock mechanism 21. The lock mechanism 21 can be fitted into the recess 20.
In the hydraulic rotary machine including a spring 25 for urging the concave portion 20 toward the concave portion 20, the piston 22 is configured to fit into the concave portion 20, and the rod is projected to the lock mechanism cap 33 screwed into the cylinder 23. A port 28 is opened, and a rod 29 interlocking with the piston 22 is inserted into the cylinder 23. The rod 29 is configured such that the outer end 29a thereof is projected to the outside from the projecting port 28 except when the lock is activated. ing. [Effect] The locked state can be confirmed by confirming that the rod outer end portion 29a is not projected to the outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic rotary machine, and more particularly to an axial-plunger type hydraulic motor that is effectively used as a drive source for a working machine such as a civil engineering construction machine.

[0002]

[Prior Art]

 As a general axial-plunger type hydraulic motor, it has a rotating cylinder block and a plurality of cylinder chambers that are formed in the cylinder block in the direction parallel to the axis, and have a communication path at each end face. , A piston that is fitted in each cylinder chamber so as to reciprocate, a valve plate that is arranged so as to slide on the end surface of the cylinder block, and a pair of intake and exhaust ports that are respectively opened in the valve plate. By rotating the cylinder block while slidingly contacting the valve plate, the cylinders and the intake / exhaust ports are intermittently communicated with each other, and a motor action is performed by the reciprocating motion of the pistons. There is something that can be done.

This type of hydraulic motor is used as a drive source for a vehicle-mounted crane.

By the way, the vehicle-mounted crane is required to ensure the safety by preventing the boom from swinging when the vehicle (hereinafter referred to as a crane vehicle) travels.

Therefore, conventionally, in a hydraulic motor for a mobile crane, a recess is formed in a cylinder block or a rotating member that rotates together with the cylinder block, and a lock mechanism composed of a cylinder device is arranged facing the recess. When the mobile crane is running, the cylinder device as a lock mechanism is operated, the piston is fitted into the recess, and the hydraulic motor is locked.

[0006]

[Problems to be solved by the device]

 However, in the conventional hydraulic motor having the lock mechanism, it is not possible to visually confirm whether or not the lock piston is fitted in the recess. Therefore, when the mobile crane runs without the hydraulic motor being locked, there is a risk that the swivel base of the mobile crane will move.

An object of the present invention is to provide a hydraulic rotary machine capable of visually confirming whether or not a lock mechanism is in a locked state.

[0008]

[Means for Solving the Problems]

 A hydraulic rotary machine according to the present invention includes a rotating cylinder block, a plurality of cylinder chambers formed in a cylinder block in a direction parallel to the axis of the cylinder block, and a plurality of cylinder chambers each having a communication passage at each end face. It has a piston that is fitted in each cylinder chamber so that it can reciprocate, and a pair of intake and exhaust ports.The cylinder block or a rotating member that rotates together with the cylinder block has a concave portion that faces each other. The lock mechanism is disposed in the liquid circuit communicating with the pair of suction and discharge ports, and the lock piston is slidable. It is equipped with a freely stored cylinder and an elastic body that is installed in this cylinder and urges the locking piston toward the concave side. In a hydraulic rotary machine configured such that when the body pressure falls below the elastic force of the elastic body, the locking piston is fitted into the recess due to the elastic force, the projection for the piston top facing the locking cylinder. A mouth is opened, and a rod that is slidably inserted into the cylinder and is capable of projecting from the projecting mouth is connected to the locking piston, and this rod is an end when the locking piston is not in a locking operation. The part is configured to be projected from the projecting port.

The hydraulic rotary machine according to the present invention is characterized in that a portion of the rod protruding from the cylinder is coated with fluorescent paint.

Further, in the hydraulic rotary machine according to the present invention, the rod detector may detect the protruding state of the rod and the rod end may be in the protruding state by the rod detector when the locking piston is locked. And an alarm device that issues an alarm when detected.

[0011]

[Action]

 According to the above-mentioned means, the rod interlocked with the piston is in a state of being depressed in the projecting port when the piston is locked, and the rod end is in a state of projecting from the projecting port at other times, By observing whether or not the end of the rod is projected from the cylinder, it is possible to visually confirm whether or not the lock mechanism is in the locked state.

Further, when the fluorescent paint is applied to the end portion of the rod, it is possible to confirm from the appearance whether or not the lock mechanism is in the locked state even at night.

Furthermore, when the protruding state of the rod is detected and an alarm is issued when the rod end is in the protruding state when the lock should be operating, an accident in the unlocked state is prevented in advance. It becomes possible.

[0014]

【Example】

 1 is a longitudinal sectional view showing a hydraulic rotary machine according to an embodiment of the present invention, FIG. 2 is an enlarged partial sectional view showing a lock release state of a lock mechanism, and FIGS. 3 (a) and 3 (b) are FIG. 2 is a sectional view taken along line aa of FIG. 1 and a sectional view taken along line bb of FIG. 1.

In this embodiment, the hydraulic rotary machine according to the present invention is configured as an axial-plunger type hydraulic motor, and includes a casing 1 formed in a substantially cylindrical shape. A rotary shaft 2 is rotatably supported and installed on a shaft center of the casing 1 via a bearing.

A cylinder block 3 formed in a substantially columnar shape is concentrically arranged and accommodated in the casing 1, and the cylinder block 3 rotates integrally with a rotary shaft 2 via a spline 4. Are combined.

A plurality of cylinder chambers 5 are arranged around the rotation axis of the cylinder block 3 at equal intervals in the circumferential direction on the same radius, and are bored in a direction parallel to the axial center. Has a cylindrical shape with one end closed and the other end open. A communication passage 6 is formed in an arc-shaped elongated hole concentric with the cylinder block 3 at a substantially central position on the closed end wall of each cylinder chamber 5, and a piston is provided in each cylinder chamber 5. 7 are reciprocally slidably inserted from the respective open ends.

A swash plate 8 is arranged at a rear position on the closed end side of the cylinder chamber 5 in the casing 1 so as to be inclined at a predetermined angle with respect to the rotating shaft 2, and is fixed to the swash plate 8. Are arranged such that a plurality of pistons 7 are reciprocally slidable in a direction parallel to the axial center and slidably in a circumferential direction of the axial center, whereby the pistons 7 respectively move the cylinder chamber 5 when the cylinder block 3 rotates. It is designed to reciprocate.

An end plate 12 is in contact with the casing 1 on the side opposite to the swash plate 8 so as to close the end face opening, and a first intake / exhaust passage 13 and a second intake / exhaust passage 14 are formed in the end plate 12, respectively. Has been done. A valve plate 15 having a substantially disc shape is substantially formed on the inner end surface of the end plate 12, and the other end surface of the valve plate 15 has an end surface on the communication passage 6 side of the cylinder block 3 which is It is slidably pressed under the bias of a compression spring 17, which is interposed between the block 3 and the rotary shaft 2 in a stored state.

A first intake / exhaust port 18 and a second intake / exhaust port 19 are arranged in the valve plate 15 symmetrically with respect to the communicating passages 6 formed in the cylinder block 3 on the same radius. The first suction / discharge port 18 is connected to the first suction / discharge passage 13, and the second suction / discharge port 19 is connected to the second suction / discharge passage 14.

A plurality of circular hole-shaped recesses 20 are provided on the outer peripheral surface of the cylinder block 3 at intervals in the circumferential direction, and are recessed in the casing 1 facing the recesses 20. A locking mechanism 21 is provided in which the device is used.

The lock mechanism 21 includes a lock piston 22 that can be fitted in the recess 20, a cylinder 23 in which the lock piston 22 is slidably fitted in a cylinder chamber 24, and a cylinder chamber of the cylinder 23. And a spring 25 that is mounted inside the valve 24 and presses the locking piston 22 toward the recess 20 side.

A control port 26 is provided on a side wall of the cylinder 23 so as to communicate with a pressure chamber 24 a of the cylinder chamber 24 opposite to the spring 25. The control port 26 drives the hydraulic motor. Is connected to a hydraulic circuit (not shown).

On the other hand, a drain port 27 is opened in the piston 22 so that the pressure chamber 24 b on the spring 25 side communicates with the inside of the casing 1 of the hydraulic motor. The drain port 27 causes the back pressure of the piston 22 to drain. It is supposed to be done.

When the hydraulic pressure in the hydraulic circuit exceeds the urging force of the spring 25, the tip (hereinafter referred to as the inner end) 22 a of the lock piston 22 is housed in the cylinder 23, and the hydraulic pressure is applied to the spring 25. When the urging force of the spring 25 is lower than the urging force of the spring 25, the inner end 22a projects from the cylinder 23 and is inserted into the recess 20 by the urging force of the spring 25.

Further, a cap 33 of the lock mechanism 21 is screwed into the cylinder 23, and a rod projecting port 28 is opened in the cap 33 at a position facing the top of the locking piston 22. A rod 29 is slidably inserted in this. One end of the rod 29 is brought into contact with the top surface of the piston 22 and is pressed by the spring 25, and the other end is slidably inserted into the projecting port 28.

As shown in FIG. 2, when the lock is released, the insertion end portion (hereinafter, referred to as an outer end portion) 29 a of the rod 29 into the projecting port is projected to the outside from the projecting port 28 of the cap 33. It has become so. Further, the outer end 29a of the rod 29 is recessed into the projecting port 28 during the lock operation.

Further, in this embodiment, a fluorescent paint layer 30 is formed on the outer end portion 29 a of the rod 29. The fluorescent coating layer 30 can be formed by applying a fluorescent coating to the end portion of the rod 29 on the protruding opening side.

Next, the operation of the hydraulic motor according to the above configuration will be described.

When the rotary shaft 2 is intended to be rotationally driven in the clockwise direction indicated by the arrow A in FIG. 3A, while the piston 7 shifts from the top dead center to the bottom dead center, the cylinder 7 If the correlation of the swash plate 8, the cylinder block 3, the valve plate 15, etc. is set so that the chamber 5 communicates with the first intake / exhaust port 18 via the communication passage 6, the high pressure oil will flow into the cylinder chamber 5. It will flow in through the first intake / exhaust passage 13, the first intake / exhaust port 18, and the communication passage 6.

Since the piston 7 is pressed by the inflow of this high-pressure oil into the cylinder chamber 5, the joint portion 11 of the piston 7 is pressed against the swash plate 8 via the shoe 9. Due to the circumferential force component of the pressing force, a torque is generated to rotate the piston 7, that is, the cylinder block 3 supporting the piston 7. Since the torque for rotating the cylinder block 3 is transmitted to the rotary shaft 2 via the spline 4, the rotary shaft 2 is rotationally driven in the direction indicated by the arrow A.

The cylinder chamber 5 communicates with the second intake / exhaust port 19 while the piston 7 moves from the bottom dead center to the top dead center as the cylinder block 3 rotates. At this time, the piston 7 is pushed back by the swash plate 8, so that the oil in the cylinder chamber 5 is discharged from the cylinder chamber 5 to the second suction / discharge passage 14 through the communication passage 6 and the second suction / discharge port 19.

In this way, the motor action is performed by repeating the inflow of high-pressure oil into the cylinder chamber 5 and the discharge from the cylinder chamber 5.

When the motor action stops and the pressure in the hydraulic circuit drops, and this pressure falls below the biasing force of the spring 25, the biasing force of the spring 25 causes the locking piston 22 to slide and the inner end 22a to move. It is inserted into the recess 20. The fitting of the locking piston 22 and the recess 20 locks the hydraulic motor.

In this way, the locking piston 22 is automatically fitted into the recess 20. Therefore, when this hydraulic motor is used as the drive source of the vehicle-mounted crane, the hydraulic motor is not locked. Therefore, it is possible to prevent the situation where the crane vehicle starts to travel unexpectedly, so that it is possible to prevent the boom from accidentally shaking when the crane vehicle travels.

Further, since the lock mechanism 21 is configured by the cylinder device, the configuration of the lock mechanism 21 can be simplified, and the hydraulic motor used in the vehicle-mounted crane can be reduced in weight and cost. Can contribute to.

Further, in this embodiment, when the lock mechanism 21 is unlocked, the outer end 29a of the rod 29 is projected from the cap 33, and when the lock is activated, the entire rod 29 is housed in the cylinder 23. By confirming whether the outer end 29a of 29 is projected from the cap 33, it is possible to confirm from the appearance whether the lock mechanism 21 is in the locked state. Therefore, the safe traveling of the mobile crane can be more reliably maintained.

In this embodiment, since the fluorescent paint layer 30 is formed on the outer end 29a of the rod 29, it is necessary to visually confirm whether the lock mechanism 21 is in the locked state even at night. You can

FIG. 4 is a partial schematic view showing a hydraulic rotary machine according to another embodiment of the present invention.

The present embodiment is different from the first embodiment in that a limit switch 31 as a rod detector for detecting the protruding state of the outer end 29a of the rod 29 is arranged near the protruding port 28 of the cap 33. In addition to being provided, an alarm 32 is connected to the limit switch 31.

According to the second embodiment, the output signal of the limit switch 31 is monitored, and when it is detected by the limit switch 31 that the rod 29 is in the protruding state during the lock operation, the alarm device 32 automatically sets. Since an alarm can be issued, it can be warned that the hydraulic motor is not locked when it should be locked due to a failure of the lock mechanism or the like.

This warning can prevent the crane vehicle from traveling in the unlocked state, so that the swivel base can be more reliably prevented from accidentally moving when the crane vehicle is traveling. You can

It is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

For example, the fluorescent paint layer 30 formed on the outer end portion 29 a of the rod 29 may be omitted. It goes without saying that the limit switch 31 and the alarm 32 may be omitted.

[0045]

[Effect of the device]

 As described above, according to the present invention, the rod interlocked with the locking piston is slidably inserted into the projecting opening of the cylinder, and the outer end portion of the rod is retained when the locking piston is not locked. Since it is configured to project from the cylinder, it is possible to visually confirm whether the lock mechanism is in the locked state or not by the presence or absence of the projection of the rod outer end.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a hydraulic rotary machine according to an embodiment of the present invention.

FIG. 2 is an enlarged partial sectional view showing a lock released state of a lock mechanism.

3A is a sectional view taken along the line aa in FIG. 1, FIG.
Is a sectional view taken along line bb.

FIG. 4 is a partial schematic view showing a hydraulic rotary machine according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Casing, 2 ... Rotating shaft, 3 ... Cylinder block,
4 ... Spline, 5 ... Cylinder chamber, 6 ... Communication path, 7 ... Piston, 8 ... Swash plate, 12 ... End plate, 13 ... 1st
Intake / exhaust passage, 14 ... Second intake / exhaust passage, 15 ... Valve plate, 1
6 ... Spring, 17 ... Compression spring, 18 ... First intake / exhaust port, 19 ... Second intake / exhaust port, 20 ... Recessed portion, 21 ...
Lock mechanism, 22 ... Locking piston, 23 ... Cylinder, 24 ... Cylinder chamber, 25 ... Spring, 26 ... Control port, 27 ... Drain port, 28 ... Projection port, 29 ... Rod, 29a ... Rod outer end portion, 30 … Fluorescent paint layer,
31 ... Limit switch, 32 ... Alarm device, 33 ... Cap.

Claims (3)

[Scope of utility model registration request] 1. A rotating cylinder block, a plurality of cylinder chambers respectively formed in the cylinder block in a direction parallel to the axis thereof, each end face having a communication passage, and reciprocating motions in each cylinder chamber. Each of which is fitted with a piston and a pair of intake and exhaust ports, a recess is formed in the cylinder block or a rotating member that rotates together with the cylinder block, and the lock mechanism is arranged opposite to this recess. The lock mechanism is provided in a lock piston that can fit in the recess and in a liquid circuit that communicates with the pair of suction and discharge ports, and the lock piston is slidably accommodated. A cylinder and an elastic body that is mounted in the cylinder and urges the locking piston toward the recess,
In a hydraulic rotary machine configured such that when the liquid pressure in the liquid circuit falls below the elastic force of the elastic body, the locking piston is fitted into the recess by the elastic force, and the piston top faces the locking cylinder. A projecting port is opened, and a rod that is slidably inserted into the cylinder and is capable of projecting from the projecting port is connected to the locking piston, and the rod has an end portion when the locking piston is not in a locking operation. The hydraulic rotating machine is characterized in that it is configured to be projected from the projecting port. 2. The hydraulic rotary machine according to claim 1, wherein a fluorescent paint is applied to a portion of the rod protruding from the cylinder. 3. A rod detector for detecting the protruding state of the rod, and an alarm device for issuing an alarm when the rod detector detects that the rod end portion is in the protruding state during the locking operation of the locking piston. The hydraulic rotary machine according to claim 1, further comprising: