JP3318528B2 - Forward and backward operation mechanism of vibration compaction machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eccentric pendulum that rotates on a parallel axis and changes the phase of rotation of one eccentric pendulum with respect to the other eccentric pendulum, and moves the body forward and backward by a combined vector. The present invention relates to a forward and backward operation mechanism in a relatively large vibration compacting machine to be operated.

[0002]

2. Description of the Related Art Conventionally, a vibration compaction machine of this type which changes the phase of rotation of one eccentric pendulum with respect to the other eccentric pendulum among a pair of eccentric pendulums and gives forward / backward movement to the body by a combined vector thereof. Among them, various types are known, and among those using hydraulic power for forward / reverse switching operation for changing the rotation phase of one eccentric pendulum, for example, Japanese Patent Publication No. Sho 61-48997 JP-A-63-60306, JP-B-5-17323, and JP-A-7-286306 (Japanese Patent No. 2513586).

[0003] In these vibration compactors, a spiral groove is provided inside a driven gear on a driven shaft that receives rotation from a drive shaft, and a pin that engages with the spiral groove of the driven gear is provided in the driven shaft. A eccentric pendulum on the driven shaft is provided with respect to an eccentric pendulum on the drive shaft by providing a forward / backward switching shaft having the same and moving the forward / backward switching shaft in the axial direction and rotating a driven gear having a spiral groove. Is common in that the phase of the rotation is changed.

[0004]

Among the compacting machines described above, the compacting machine disclosed in Japanese Patent Publication No. 61-48997 has a driven shaft as a cylinder, a forward / reverse switching shaft as a piston, and a pendulum on the driven shaft as a drive shaft. The combined thrust to rotate in combination with the upper pendulum gives the piston-like forward / reverse switching shaft a mechanical return force to move to one side of the cylindrical driven shaft, and the pressure provided at one end of the cylindrical driven shaft. In the medium chamber, an external pressure supply device applies an oil pressure against a mechanical return force of the piston-like forward / reverse switching shaft, and the supply amount of the pressure oil is variably adjusted so that the driven gear is driven. It is characterized in that the rotation angle can be selected to a position suitable for changing the phase of the eccentric pendulum.

However, in this compacting machine, a combined thrust of the rotating eccentric pendulum opposes a mechanical return force for moving the piston-like forward / reverse switching shaft to one side of the cylinder, and an external pressure supply device. Since the means for sending oil pressure into the pressure medium chamber provided at one end of the cylindrical driven shaft is a hand-operated pump, the piston is moved forward and backward by the switching shaft receiving the maximum mechanical return force and From the forward or reverse maximum speed position moving to one side,
A large amount of labor is required to switch the hand-operated pump to the opposite side to pump the pressure oil into the pressure medium chamber. Especially, in the case of a compacting machine having a large body weight, the switching operation force becomes heavy and cannot be operated. There is a point.

In the compacting machine disclosed in Japanese Patent Publication No. 5-17323, a forward / reverse switching shaft is arranged in a driven shaft so as to be able to maintain neutrality by springs on both sides, and pistons are provided at both ends of the forward / backward switching shaft, respectively. And a cylinder,
Both cylinders are connected to an external pressure supply device, and pressurized oil is sent from the external pressure supply device into one of the cylinders so that the forward / reverse switching shaft can be moved. As for the machine, the means for sending hydraulic pressure into each cylinder is a hand-operated type pump, and therefore, as with the compacting machine of the above-mentioned JP-B-61-48997, it is necessary to send a large amount of oil into the cylinder. There is a problem that it requires labor and cannot be used for a compacting machine having a large switching operation force and a large body weight.

On the other hand, in the compacting machine disclosed in Japanese Patent Application Laid-Open No. 63-60306, a piston and a cylinder are provided at one end of a forward / reverse switching shaft in a driven shaft, and the cylinder is provided with three directions of forward, reverse and neutral. A switching valve is provided, and a hydraulic pump circuit in which these valves always return to a neutral position by the force of a spring is connected, and pressure oil is supplied to the cylinder from the pressure of the hydraulic pump through a forward valve and a reverse valve. This compacting machine has the advantage that the pressure oil by the power of the hydraulic pump can be sent to the cylinder at one end of the forward / reverse switching shaft, so that the switching operation force is light and the speed can be controlled. On the other hand, since the switching valve always returns to the neutral position due to the force of the spring, the operation lever cannot be fixed and held at any tilted position. There is a problem that it is difficult.

Further, in the compacting machine disclosed in Japanese Patent Application Laid-Open No. 7-286306, similarly to the compacting machine described in Japanese Patent Publication No. 5-17323, the forward / reverse switching shaft can be maintained neutral in the driven shaft by springs on both sides. And a piston and a cylinder are provided at both ends of the forward / reverse switching shaft, respectively.
A hydraulic pump circuit equipped with a three-way switching valve for forward, reverse, and neutral is connected to both cylinders as an external pressure supply device, and forward and backward switching is performed by sending pressure oil from either valve to each cylinder. The shaft is switched to any one of forward, reverse and neutral directions.

However, in this compacting machine, hydraulic oil can be supplied to the cylinders at both ends of the forward / reverse switching shaft by the power of a hydraulic pump, so that the switching operation force can be reduced, but switching to forward and backward valves is performed. Therefore, all the hydraulic oil from the hydraulic pump is sent in that direction, and the forward and reverse speeds are set to the running state with the highest speed. Therefore, there is a problem that the running speed cannot be adjusted to an arbitrary speed. .

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in a conventional vibration compacting machine of this type, and is provided with a method for changing the phase of rotation of one eccentric pendulum in an exciter. For the forward switching operation, using a hydraulic pump circuit having a servo function as an external pressure supply device, even if the body weight is 500 kg or more, a large compaction machine,
The switching operation of the forward / reverse switching shaft can be made extremely light, and the operating lever can be set at any position between the fastest forward speed and the farthest reverse position so that the vehicle can run at a desired speed. It is intended to provide a compacting machine.

[0011] The present invention, as a specific means for that,
An eccentric pendulum that can change the phase of rotation with respect to the eccentric pendulum on the other axis is provided on one of the interlocked parallel axes, and forward and backward switching is performed within the eccentric pendulum axis to change the phase of the eccentric pendulum. The forward / backward switching shaft is slidably inserted, and the forward / backward switching shaft is axially moved at one end on the axis of the forward / backward switching shaft by hydraulic pressure against a mechanical return force generated by rotation of the eccentric pendulum. In a vibration compaction machine equipped with a vibrating device having a hydraulic cylinder for switching the rotation of the pendulum in the forward / backward direction, a forward / backward operating device connected to the hydraulic cylinder is provided at one end in a cylindrical body. It has a piston which receives the mechanical return force applied from the direction of the forward / reverse switching shaft inside, and has an operating rod for forward / reverse switching at the other end in the body, and is provided at a central portion in the body. A spool for a servo valve mechanism for supplying pressure oil sent from a hydraulic pump outside the body as a pressure opposed to the mechanical return force to the outside of the piston is provided between the piston and the forward / backward switching operation rod. Are arranged via a spring.

An exciter for introducing pressure oil as a mechanical return force applied from a direction of a forward / reverse switching shaft of an exciter between a spool in a center portion of the body and an inner side of the piston, toward the inner side of the piston. Pump having a side hydraulic flow path and supplying pressure oil sent from a hydraulic pump outside the body as a pressure opposed to the mechanical return force between the spool and the outside of the piston in an outward direction of the piston. Side hydraulic passage.

Further, the spool is moved to the left and right by the operation of the operation rod by the operation of the operation rod. And a hydraulic flow path for feeding the piston outward through one concave groove provided on the outer periphery of the spool in the body, and the outside of the piston via the other concave groove provided on the outer periphery of the spool by movement of the spool. A tank-side circuit is provided for releasing pressure oil returned from the direction through the hydraulic flow path to the tank.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a vibration compaction machine according to the present invention will be described with reference to an embodiment shown in the drawings. As shown in FIG. It basically comprises a forward / backward operating device 20 provided with a hydraulic servo valve mechanism for operating the forward / backward switching shaft 12 of the device 1.

The vibrating device 1 has a drive shaft 3 to which rotation is transmitted from an engine (not shown) via a pulley 2, and a driven shaft 4 arranged in parallel with the drive shaft 3.
An eccentric pendulum 5 is fixed on the driven shaft 4, and a similar eccentric pendulum 6 is mounted on the driven shaft 4 so as to be able to change the phase with respect to the drive shaft eccentric pendulum 5.

A driven gear 7 is provided at the center of the driven shaft 4 so as to be rotatable with respect to the shaft 4 and not to be movable in the axial direction. The rotation is transmitted from a drive gear 8 fixed to the center of the motor. The driven gear 7 is provided with a spiral groove 10 that is inclined with respect to the axis of the boss 9 on the inner wall of the boss 9.

On the other hand, the driven shaft 4 has a cylindrical shape,
In the portion where the driven gear 7 is located, elongated holes 11 are respectively formed along opposing shaft walls along the axial direction.
A forward / reverse switching shaft 12 is inserted into the driven shaft 4 so as to be rotatable and movable in the axial direction.

The forward / reverse switching shaft 12 has a large-diameter portion 13 that slides on the inner diameter of the driven shaft 4 and a small-diameter portion 14 protruding from one end of the large-diameter portion 13. A piston 15 is provided at the tip of the part 14 via a bearing 16,
The piston 15 is inserted into a hydraulic cylinder 18 provided at one end of an exciter case 17 located on the axis of the driven shaft 4.

Further, a pin 19 is embedded in the large-diameter portion 13 of the forward / reverse switching shaft 12 so as to be orthogonal to the axial direction of the switching shaft 12. It penetrates the hole 11 and engages in the spiral groove 10 in the inner wall of the driven shaft 4.

A piston 15 at one end of the forward / reverse switching shaft 12
In a state in which no external hydraulic pressure acts on the hydraulic cylinder 18 in which the driven gear 7 is inserted, when the rotation from the driving gear 8 is transmitted to the driven gear 7, the forward / reverse switching shaft 12
The lead angle of the spiral groove 10, the lead angle direction, and the driven angle are determined by the fact that both ends of the pin 19 pass through the elongated hole 11 of the driven shaft 4 and engage in the spiral groove 10 on the inner wall of the driven shaft 4. A mechanical return force that is pushed rightward in FIG. 1 is applied along with the rotation direction of the gear 7. The state in which the forward / reverse switching shaft 12 has moved to the rightmost side in the drawing corresponds to the phase in which the eccentric pendulum 6 of the driven shaft 4 moves forward or backward with respect to the eccentric pendulum 5 of the drive shaft 3, for example, at the fastest traveling speed. This means that it has rotated to the position.

On the other hand, a hydraulic cylinder 18 into which a piston 15 at one end of the forward / reverse switching shaft 12 is inserted is connected to one end of the forward / backward operating device 20 provided outside. As shown in FIG. 2, the forward / reverse operating device 20 is configured such that the forward / reverse switching shaft 12 in the driven shaft 4 is connected to the spiral groove 10 of the driven gear 7.
To receive a mechanical return force in the right direction,
Utilizing pressure oil sent from an external hydraulic pump 41, a force that resists the mechanical return force is applied to the hydraulic cylinder 18 or a forward / reverse switching shaft that overcomes the mechanical return force. 12 is pushed back in the opposite left (reverse) direction of FIG.

The forward / reverse operating device 20 is shown in FIGS.
As shown in the figure, in the right end chamber 21a at one end of the body 21,
An operation rod 22 inserted so that an outer end thereof is connected to a forward / backward operation lever 23, and a spool 24 inserted into the central chamber 21b so as to be operated by the operation rod 22.
And a piston 29 inserted into the other left end chamber 21c to be operated by the spool 24,
The vibrating device 1 is installed in the central chamber 21b having the spool 24.
An exciter-side circuit 45 connected to the hydraulic cylinder 18 is provided.

As shown in FIG. 2 and FIG.
The inside of the right end chamber 21a of 1 is a cylinder 26,
The operation rod 22 having a large-diameter portion 22a at its inner end is slidably inserted. A hole 22b is provided at the inner end having the large-diameter portion 22a. On the outer peripheral surface of the inner end, a spring receiver 25 having an inner protrusion 25a at one end engaging with the right end of the large diameter portion 22a and an outer protrusion 25b at the other end abutting against the inner wall of the central chamber 21b of the body 21 is provided. A spring 27 is fitted between the outer projection 25b of the spring receiver 25 and the right end of the cylinder 26 to hold the operation rod 22 at a neutral position.
Is inserted.

The inside of the left side chamber 21c of the body 21 is a hydraulic cylinder 28, and the piston 29
The rod 30 protruding to the right of the piston 29 is slidably inserted into a bearing 31 provided on the side of the center chamber 21b of the left chamber 21c. Inside the rod 30, there is provided a hole 30a having a right end opening toward the central chamber 21b, and a spring 32 having one end projecting into the central chamber 21b is arranged in the hole 30a. .

On the other hand, in the central chamber 21b of the body 21,
A hole 3 for coaxially communicating the right chamber 21a and the left chamber 21c.
3 is provided, and the spool 24 is inserted into the hole 33.
Is slidably disposed, and a space between a flange 34a protruding from the outer periphery of the right end of the spool 24 and the operation rod 22 is supported by a spring 35 disposed in a hole 22b of the operation rod 22. The distance between the flange 34b protruding from the outer periphery of the left end of the
The spool 24 is supported by the spring 32 disposed in the hole 30a, and the spool 24 is held at a predetermined position in the center of the central chamber 21b by the springs 32 and 35 on both sides with uniform spring pressure.

As shown in FIG.
b, the length of the hole 33 for inserting the spool is determined by the flanges 34a and 34b
Is set slightly shorter than the interval between the central chamber 21b and the springs 32 and 35 on both sides.
In a state where the hole 33 is held at a predetermined position in the center, a gap 3 is formed between the right end of the hole 33 and the flange 34a on the right side of the spool 24.
6a and a long recess 38 at the left end of the hole 33 between the left side flange 34b of the spool 24 and a gap 36b. The right end of 30 can enter.

A pair of left and right concave grooves 39 and 40 are provided at a predetermined interval in the center of the spool 24, and a central chamber 21b into which the spool 24 is inserted.
Is provided with a tank-side circuit 44 connected to the tank-side port T of the hydraulic pump 41 disposed outside the body 21 at a position connected to the concave groove 40 on the left side of the spool 24.

On the other hand, although not shown in FIG. 2 and FIG. 3, as shown in FIG.
Of the hydraulic pump 4 toward the side of the hole 33 where
A pump-side circuit 42 connected to the first pump-side port P is provided, and an upper surface of the hole 33 at an intermediate portion between the concave grooves 39 and 40 passes from the center chamber 21b to the left side chamber 21c to the inside of the hydraulic cylinder 28. Is provided with a hydraulic flow path 43 communicating to the left side of the piston 29 in FIG.

Further, as shown in FIG. 4, the vibrating device 1 is mounted on another portion of the side surface of the central chamber 21b so as to be parallel to the pump-side circuit 42 connected to the pump-side port P of the hydraulic pump 41. A vibration generating device side circuit 45 communicating with the hydraulic cylinder 18 of the forward / reverse switching shaft 12 is provided. The circuit 45 is provided with a piston 29 in the hydraulic cylinder 28 through the center chamber 21b and the left chamber 21c. A hydraulic flow path 46 having a check valve 47 communicating to the right side is provided.

The reference numeral 48 in FIG.
2 shows a relief valve for discharging air mixed in the hydraulic cylinder 18 of the forward / reverse switching shaft 12 in FIG.

When the compacting machine having the above structure is used and the body is to be kept neutral, as shown in FIG.
The operation lever 23 of the forward / reverse operation device 20 is set at the neutral position. In this state, the spool 24 of the forward / reverse operating device 20
Is located at the center of the body center chamber 21 b by the spring pressures of the left and right springs 32 and 35, so that the hydraulic passage 43 for sending pressure oil to the left side of the piston 28 in the hydraulic cylinder 29 is Grooves 39, 40
, The pump side circuit 42 is closed, and the operating rod 22 receiving the rightward spring pressure by the right spring 35 is moved by the spring 27 via the outer spring receiver 25 to the right spring. Since the operation rod 22 receives the pressure, the operation rod 22 connected to the operation lever 23 maintains the neutral position even when the hand is released.

At this time, the forward / reverse switching shaft 12 of the vibration generator 1 shown in FIG. 1 is also located at the center of the driven shaft 7.
As a result, the hydraulic oil in the hydraulic cylinder 18 of the vibration generating device 1 is subjected to a mechanical return force in the rightward direction.
Through the hydraulic passage 46 to the right side of the piston 29 in the hydraulic cylinder 28, and the piston 29 is pushed leftward in the hydraulic cylinder 28 from the position shown in FIG.

When the piston 29 is pushed leftward, the spool 24 is moved leftward by the right spring 35 because the neutral position of the operation rod 22 is fixed by the outer spring 27 as described above. become. The leftward movement of the spool 24 is caused by the fact that the right flange 34 a of the spool 24 is
Is a small distance abutting the edge of the

When the spool 24 moves to the left, as shown in FIG. 5, a concave groove 39 communicating with the right pump side circuit 42 on the outer peripheral surface of the spool 24 forms a hydraulic flow path communicating with the left side of the piston 28 in the hydraulic cylinder 28. Connect with 43,
Pressure oil sent from the pump side circuit 42 of the hydraulic pump 41 is sent to the left side of the piston 29 in the hydraulic cylinder 28. As the amount of pressurized oil gradually increases, it overcomes the force of pushing the piston 29 applied from the direction of the hydraulic cylinder 18 of the vibrating device 1 to the left,
This time, the piston 29 will be pushed back to the right,
The spool 24 is moved to the right by the left spring 32. The rightward movement of the spool 24 is a slight distance at which the left flange 34 b of the spool 24 abuts the end of the concave portion 38 at the left end of the hole 33.

When the spool 24 moves to the right, as shown in FIG.
, The flow of the pressure oil sent from the pump side circuit 42 to the left side of the piston 29 in the hydraulic cylinder 28 through the hydraulic flow path 43 is cut off, and the pressure oil is again sent from the vibration generator side circuit 45. It flows into the right side of the piston 29 of the hydraulic cylinder 28 through the hydraulic passage 46 and pushes the piston 29 back to the left.

As a result, when the operation lever 23 is maintained in the neutral position, the piston 29 is pushed to the left in the hydraulic cylinder 28 by the mechanical return force from the vibration device side circuit 45. The spool 24 moves to the left and the pump-side circuit 42 is opened by the connection between the concave groove 39 and the hydraulic flow path 43, and the pressure oil pushes the piston 29 back to the right in the hydraulic cylinder 28. Moves to the right, and the hydraulic flow path 43 is positioned between the grooves 39 and 40, thereby closing the circuit of the pump side circuit 42, and the piston 29 is returned to the left side again by the mechanical return force from the vibration generator side circuit 45. The neutral position is maintained while automatically repeating the push-out direction.

That is, in this compacting machine, the body weight is 50
0 kg or more, and when the operation lever 23 is operated, even if a strong mechanical return force corresponding to the weight of the machine body is received from the vibration device 1, the mechanical return force is applied. When the piston 29 is pushed to the left, the circuit of the pump-side circuit 42 opens at the next moment and resists the mechanical return force. Further, at this time, as shown in FIG. 2, the operation lever 23 is placed at a position where the operation lever 23 can be held neutral by the spring 27 outside the spring receiver 25 in the operation rod 22, so that the force for holding the operation lever 23 by hand is reduced. This is not necessary, and the aircraft body can be held at the neutral position even if the hand is released from the operation lever 23.

When the body is to be advanced from neutral, as shown in FIG. 6, the operation lever 23 is continuously pushed to the fastest forward position on the left side of the drawing, or an arbitrary speed setting between neutral and fastest forward is set. What is necessary is just to hold | maintain in an angular position.

When the operating lever 23 is continuously pushed from the neutral position to the leftmost forward speed position, the spool 24 is first pushed by the operating rod 22 to the left in the drawing, so that the phenomenon is first shown in FIG. As shown in FIG. 6, the hydraulic passage 43 by the pump-side circuit 42 is opened, and the piston 29 is pushed rightward. As a result, the spool 32 is pushed to the right by the spring 32, thereby closing the hydraulic passage 43 by the pump-side circuit 42 as shown in FIG. It flows into the cylinder 28 to the right of the piston 29.

Even if the pressure oil from the vibration device side circuit 45 flows to the right side of the piston 29 in the hydraulic cylinder 28, the pressure oil on the left side of the piston 29 is supplied to both the hydraulic passages 43 by the pump side circuit 42 as shown in FIG. The piston 29 is stopped by the balance between the left and right pressure oils because the piston 29 is closed in the middle of the concave grooves 39 and 40. When the operating rod 22 is further pushed to the left from this state, the spool 24 moves to the left, the concave groove 39 connects to the hydraulic flow path 43, the pump-side circuit 42 opens, and the piston 29 is pushed to the right. As a result, the spool 24 moves to the right again and the pump-side circuit 42
Finally, the piston 29 is gradually moved to a position where the right end of the piston 29 abuts the right end of the body left end chamber 21c as shown in FIG. Reach.

When the operating lever 23 is fixed at an arbitrary position in the middle of being pushed from the neutral position toward the fastest forward position, the spool 24 is moved by the operating rod 22 to the left at a predetermined position by the right spring 35. Since the pushed state is continued, as shown in FIG. 5, the spool 24 moves to the left, the concave groove 39 connects to the hydraulic passage 43, opens the pump side circuit 42, and pushes the piston 29 to the right. Become.

As a result, the spool 24 moves to the right, and this time the hydraulic passage 43 is moved to the concave grooves 39, 4 of the spool 24.
0, the pump-side circuit 42 is closed, so that the pressure oil from the vibrator-side circuit 45 flows to the right side of the piston 29 in the hydraulic cylinder 28 and presses the piston 29 to the right. At this time, since the operation rod 22 continues to be pressed to the left at a predetermined position against the spring pressure of the right spring 35, the spool 24 is forced to the left by the operation rod 22. The operation of opening the pump side circuit 42 and pushing the piston 29 to the right again is repeated, and the state in which the body advances at a predetermined speed is maintained.

On the other hand, when the body is moved backward, as shown in FIG. 7, the operation lever 23 is continuously pulled from the neutral position to the position of the fastest reverse position on the right side of the drawing, or an arbitrary speed setting between the neutral position and the fastest reverse position. What is necessary is just to hold | maintain in an angular position.

[0]
[042] In the case where the operation lever 23 is continuously pulled from the neutral position to the rightmost reverse speed position, as shown in FIG.
Since the operating rod 22 is pulled rightward by resisting the spring pressure of the spring 27 on the outer periphery of the spring receiver 25, the spring force of the right spring 35 is reduced. 40 is connected to the hydraulic passage 43. At this time, the hydraulic flow path 43 is shut off from the pump side circuit 42 and the left concave groove 40 is connected to the tank side circuit 44 communicating with the tank side port T. The hydraulic oil on the left is the hydraulic flow path 4
3 through the concave groove 40 and is discharged from the tank side circuit 44 toward the tank. When the pressure oil on the left side of the piston 29 of the hydraulic cylinder 28 is discharged to the tank side circuit 44, the pressure oil is supplied from the vibrating device side circuit 45 to the right side of the piston 29 of the hydraulic cylinder 28 to move the piston 29 to the left side. To push back to
The spring force of the left spring 32 decreases and the spool 24
Is moved to the left, and the hydraulic flow path 43 is
The hydraulic passage 43 is closed in the middle of the above, the outflow to the tank side circuit 44 is cut off, and the piston 29 stops due to the balance of the left and right pressure oils.

When the operating rod 22 is further pulled to the right from this state, the spring force of the right spring 35 decreases, so that the spool 24 moves to the right again, and the concave groove 4 on the left.
0 is connected to the hydraulic flow path 43 so that the pressure oil on the left side of the piston 29 of the hydraulic cylinder 28 passes through the concave groove 40 and the tank side circuit 4
After the oil is discharged from the tank 4 toward the tank, the pressure oil flows into the right side of the piston 29 of the hydraulic cylinder 28 from the vibration device side circuit 45 to push the piston 29 to the left, thereby moving the spool 24 to the left again. Finally, the piston 29 is gradually moved until the left end of the piston 29 comes into contact with the left end of the body left end chamber 21c as shown in FIG. 6 while repeating the operation of closing the inflow of the pressure oil from the vibration device side circuit 45. It shifts and reaches the fastest state.

When the operating lever 23 is fixed at an arbitrary position while being pushed from the neutral position to the fastest reverse position, the operating rod 22 is pulled to the right side, so that the spring force of the right spring 35 is increased. Drops and the spool 2
4 continues to be pulled to the right at a predetermined position by the spring 32 on the left side.
4 moves to the right, the concave groove 40 connects to the hydraulic flow path 43,
The pressure oil on the left side of the piston 29 of the hydraulic cylinder 28 is discharged from the hydraulic passage 43 through the concave groove 40 to the tank-side circuit 44.

When the pressure oil on the left side of the piston 29 of the hydraulic cylinder 28 is discharged to the tank-side circuit 44, the pressure oil is supplied from the vibrator-side circuit 45 to the right side of the piston 29 of the hydraulic cylinder 28 to move the piston 29 to the left. To push back to
The spring force of the left spring 32 decreases and the spool 24
Is moved to the left, and the hydraulic flow path 43 is
The hydraulic flow passage 43 is closed in the middle of the above, and the outflow to the tank side circuit 44 is blocked to release the restraining force pushing the piston 29 to the left. The spool 24 moves to the right side due to a decrease in the spring pressure of the right side spring 35 and opens the pump side circuit 42 because the state of being pulled to the right side at a predetermined position continues against Then, the motion of pushing the piston 29 to the right again is repeated, and the state in which the body moves backward at a predetermined speed is maintained.

[0047]

As described above, in the forward and backward operation mechanism of the compacting machine according to the present invention, one end in the cylindrical body is
A body for receiving a mechanical return force generated by the rotation of the eccentric pendulum applied from the direction of the forward / backward switching shaft in the exciter, and having a forward / backward switching operation rod at the other end of the body; In the center part, a spool for a servo valve mechanism for supplying pressure oil sent from a hydraulic pump outside the body as a pressure opposed to a mechanical return force from the vibration source side to the outside of the piston is provided. Since the springs are arranged between the piston and the operation rod for switching between forward and backward movements, respectively,
Even with a large compacting machine of 0 kg or more, by sending pressure oil opposing the mechanical return force of the vibration generator side from the hydraulic pump to this forward / reverse operating device, the switching operating force of the operating lever is light, Moreover, it is possible to provide an airframe capable of controlling a desired speed at any position in forward and backward traveling at the position where the operation lever is operated.

Further, according to this forward / reverse operating mechanism, the spool is disposed between the piston and the operating rod via the respective springs. As a force for operating the operating rod, the spool is provided via the pulling. It requires only a small force to move the spool a short distance and does not require the force to directly operate the piston, so the operation is light and easy to work, and even if you release your hand from the operation lever in the neutral state, the operation lever will remain Since the neutral state is automatically maintained, there is no danger of the aircraft going out of control and the safety can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a vibrating device in a vibration compaction machine of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a forward and backward operation device in the vibration compaction machine of the present invention.

FIG. 3 is an enlarged cross-sectional view of a configuration of a central portion of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a cross-sectional view of a state in which a pump-side circuit is open when the forward-reverse operation device is in a neutral position.

FIG. 6 is a cross-sectional view showing the state of the forward / reverse operation device at the maximum forward speed.

FIG. 7 is a cross-sectional view illustrating a state at the time of the maximum reverse speed of the forward / reverse operation device.

FIG. 8 is a hydraulic circuit diagram of the forward / reverse operating device.

[Explanation of symbols]

1: Exciter, 2: Pulley, 3: Drive shaft,
4: driven shaft, 5, 6: eccentric pendulum, 7: driven gear,
8: drive gear, 9: boss, 10: spiral groove, 11:
Long hole, 12: forward and backward switching shaft, 13: large diameter part, 1
4: Small diameter part, 15: Piston, 16: Bearing,
17: Exciter case, 18: Hydraulic cylinder, 1
9: pin, 20: forward and backward operation device, 21: body,
21a: body right end room, 21b: body center room,
21c: body left end room, 22: operation rod, 22
a: large diameter portion, 22b: hole, 23: operation lever, 2
4: spool, 25: spring receiver, 25a: inner protrusion, 25b: outer protrusion, 26: cylinder, 27:
Spring, 28: Hydraulic cylinder, 29: Piston, 30: Rod, 30a: Hole, 31: Bearing,
32: spring, 33: hole, 34a, 34b:
Tsuba, 35: Spring, 36a, 36b: Clearance,
37, 38: concave portion, 39, 40: concave groove, 41: hydraulic pump, 42: pump side circuit, 43: hydraulic channel,
44: tank side circuit, 45: vibration device side circuit, 46:
Hydraulic flow path, 47: Check valve, 48: Relief valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E01C 19/34 B06B 1/16

Claims (3)

(57) [Claims] 1. An eccentric pendulum for changing the phase of rotation with respect to an eccentric pendulum on the other axis is provided on one of the linked parallel axes, and the phase of the eccentric pendulum is changed in the axis of the eccentric pendulum. Slidably inserted through the forward / backward switching shaft for rotation, and one end of the forward / backward switching shaft on the axis of the forward / backward switching shaft is hydraulically opposed to a mechanical return force generated by the rotation of the eccentric pendulum. In a vibration compaction machine equipped with a vibrating device having a hydraulic cylinder for switching the rotation of a pendulum in a forward and backward direction by moving the pendulum in an axial direction, a cylinder body is used as a forward and backward operating device connected to the hydraulic cylinder. One end of the body has a piston for receiving a mechanical return force applied in the direction of the forward / reverse switching shaft to the inside, and the other end of the body has a forward / backward switching operation rod. In the center part, a spool for a servo valve mechanism for supplying pressure oil sent from a hydraulic pump outside the body as a pressure opposing the mechanical return force to the outside of the piston is switched between the piston and the forward / reverse movement. Forward and backward operating mechanism of a vibration compacting machine, wherein each operating mechanism is disposed with a spring between the operating rod and the operating rod. 2. A mechanism for introducing pressure oil as a mechanical return force applied from a direction of a forward / reverse switching shaft of a vibrating device between a spool in a center portion of a body and an inside of a piston toward an inside of the piston. A hydraulic oil passage having a vibration device-side hydraulic flow path, and pressure oil sent from a hydraulic pump outside the body as a pressure opposed to the mechanical return force between the spool and the outside of the piston is supplied to the outside of the piston. The forward / backward operation mechanism of the vibration compaction machine according to claim 1, further comprising a pump-side hydraulic flow path. 3. A hydraulic pump is provided with a hydraulic fluid from a hydraulic pump by moving the spool to the left and right by a moving operation of the operating rod on a spool in the center of the body supported via springs between the piston and the operating rod. And a hydraulic flow path for feeding the piston outward through one concave groove provided on the outer periphery of the spool in the body, and the outside of the piston via the other concave groove provided on the outer periphery of the spool by movement of the spool. 2. The forward / backward operation mechanism for a vibration compacting machine according to claim 1, further comprising a tank-side circuit for allowing pressure oil returned from the direction through the hydraulic flow path to escape to the tank.