JP2002339313A - Forward and backward movement switching device of vibration compaction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forward and backward movement switching device of a vibration compaction machine capable of preventing such a phenomenon causing a problem that a forward and backward movement switching shaft of a vibration exciter is suddenly pushed in the direction of the backward movement when a worker pushes a forward and backward movement lever from a forward movement to the position of the backward movement at one stretch in the case that a compaction of the ground is executed by the vibration compaction machine having the comparatively light weight body, since a phase of an eccentric pendulum is quickly made in the direction of the backward movement, the body is going to make the backward movement from the forward movement all at once to start the backward movement of a rolling compaction plate in a state of an attitude inclined backward and that the road surface is kicked up with the back end of the rolling compaction plate. SOLUTION: The forward and backward movement switching device is constituted of a cylindrical follower shaft 12 in the vibration exciter 3, a piston 21 for inserting the forward and backward movement switching shaft 4 inserted into a hydraulic cylinder 7 on a coaxial line with the follower shaft into the inside of the hydraulic cylinder 7, a basic shaft section 20 inside of the follower shaft 12 engaged with a spiral groove 18 of an interior wall of a follower gear boss 17 fitting both ends of a pin 24 projected to a direction at right angles to the direction of an axis to the circumference of the follower shaft 12 through a slot 19 provided along the direction of an axis of the follower shaft 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration for changing the phase of rotation of one eccentric pendulum with respect to the other eccentric pendulum of a pair of eccentric pendulums in an exciter and moving the body back and forth by a combined vector. The present invention relates to an improvement of a forward / reverse switching device in a compacting machine.

[0002]

2. Description of the Related Art Heretofore, among a pair of eccentric pendulums in an exciter, a phase of rotation of one of the eccentric pendulums with respect to the other eccentric pendulum has been changed, and a forward / backward movement of the body has been achieved by a resultant vector. The forward / backward switching mechanism of the vibration compaction machine transmits the rotation of the forward / backward lever to the rotation switching mechanism of the eccentric pendulum by mechanical means via a link or cable, and the hydraulic power is supplied by the rotation of the forward / backward lever. It is known that the power is generated and transmitted to the rotation switching mechanism of the eccentric pendulum by the hydraulic power means. Examples of the use of the hydraulic power means include Japanese Patent Publication No. 61-48997, Japanese Patent Application Laid-Open No. 63-60306, JP-B-5-17323, JP-A-6-33413, JP-A-7-286306 and the like.

[0003] The above-mentioned vibration compaction machine using hydraulic power for the forward / reverse switching mechanism includes a hydraulic cylinder of a forward / backward switching shaft for changing the phase of an eccentric pendulum in an exciter, and a front / rear side provided on a handle of the body. A hydraulic hose is connected to a forward / reverse switching hand pump having a forward / reverse lever, and the piston in the forward / backward switching hand pump is moved by operating the forward / backward lever to connect the forward / backward switching shaft of the vibration generator with the hydraulic cylinder. Communicate hydraulic power.

[0004] Of the above-mentioned mechanism using hydraulic power for the forward / reverse switching mechanism, a relatively large vibration compacting machine having a body weight of 300 kg or more is provided with a forward / reverse switching shaft by rotation of an eccentric pendulum of an exciter. The mechanical return force generated by the handwheel is large, and even if the forward / reverse lever of the forward / reverse switching hand pump provided on the body handle or the like is manually rotated, the mechanical return force cannot be countered. As shown in JP-A-48997, JP-A-63-60306, and JP-A-7-286306, a hydraulic pressure is provided between a hydraulic cylinder of a forward / reverse switching shaft in an exciter and a forward / reverse switching hand pump on a body handle. A servo mechanism capable of supplying auxiliary pressure from a hydraulic tank via a pump is provided.

[0005] On the other hand, of the above-mentioned type using a hydraulic power for the forward / reverse switching mechanism, a general-purpose vibration compacting machine having a body weight of 300 kg or less is a machine generated on a forward / reverse switching shaft by rotation of an eccentric pendulum of an exciter. Since the target return force is not so large and the forward / reverse lever of the forward / reverse switching hand pump provided on the body handle or the like can be manually rotated easily with respect to this mechanical return force, the forward / backward switching in the vibration generating device is performed. There is no need to provide a hydraulic assist servo mechanism between the hydraulic cylinder of the shaft and the forward / reverse switching hand pump on the fuselage handle. As a forward / backward switching hand pump provided on the fuselage handle, it can be switched back and forth with a light operating force. A forward switching hand pump is known from JP-A-2000-17607.

[0006]

In a light vibration compaction machine having a body weight of 300 kg or less, the mechanical return force generated on the forward / reverse switching shaft by the rotation of the eccentric pendulum of the vibration generating device is not so large. A switching hand pump such as -17607 has the advantage that the forward / reverse lever of the forward / backward switching hand pump can be easily turned manually in opposition to the mechanical return force. In this case, JP 200
In the switching hand pump of No. 0-17607, when the body is switched from reverse to forward, the cam of the lever rotation shaft is separated from the piston in the pump body, and this piston exerts a mechanical return force on the forward / reverse switching shaft. As a result, the eccentric pendulum is gradually phased forward in the forward direction by the mechanical return force, so that the machine body moves forward without any trouble.

On the other hand, in the above-mentioned switching hand pump, when the body is switched from forward to reverse, the piston is pushed in the direction opposite to the mechanical return force generated on the forward / reverse switching shaft by the rotational force of the cam of the lever rotating shaft. When a powerful worker pushes the lever in the reverse direction at once, resisting the mechanical return force, the piston in the switching hand pump body is rapidly pushed out, and the phase of the eccentric pendulum in the reverse direction is rapidly increased. Will be performed. As a result, as shown in FIG.
With the rear end B as a fulcrum, the front end C of the pressing plate A is tilted so as to float up and travels backward in that posture. B
In such a case, a motion of kicking up and digging occurs, which causes a problem of hindering appropriate compaction action.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the conventional light-weight vibration compacting machine of this type, the present invention has improved the forward / backward switching shaft of the vibration generator. When the operator pushes the forward / backward lever to the reverse position at a stroke while resisting the mechanical return force, the pressure oil in the switching hand pump body resists the mechanical return force against the hydraulic cylinder. The spring in the forward / reverse switching shaft provided in the driven shaft of the vibration exciter absorbs a part of the pushing force, and immediately the phase of the driven shaft eccentric pendulum in the backward direction The object of the present invention is to provide a forward / reverse switching device in which the eccentric pendulum smoothly moves in the reverse direction while gradually resisting the mechanical return force without gradually performing the reverse movement, so that the aircraft can smoothly move to the reverse direction. Things.

According to the first aspect of the present invention, as a specific means therefor, there is provided a forward / reverse switching device provided on a forward / reverse switching shaft of an exciter, which is provided with an eccentric pendulum for changing a phase with respect to a drive shaft eccentric pendulum. A cylindrical driven shaft, a hydraulic cylinder protruding at one end of an exciter case coaxial with the driven shaft, and a forward / reverse switching shaft inserted into the driven shaft and the hydraulic cylinder. , The forward and backward switching shaft, through a piston inserted into the hydraulic cylinder, through a long hole provided along the axial direction of the driven shaft, both ends of a pin projecting in a direction orthogonal to the axial direction, the driven shaft And a spring disposed in the driven shaft between the base shaft and the piston, the base being engaged with the spiral groove of the inner wall of the boss of the driven gear fitted on the outer periphery of the driven gear. It is characterized by the following.

The structure of the forward / reverse switching shaft is such that the piston of the forward / reverse switching shaft is moved to the outermost position in the hydraulic cylinder by the mechanical return force generated on the forward / reverse switching shaft by the rotation of the spiral groove in the inner wall of the boss of the driven gear. Even when the piston is pushed to the directional position, the flanged end of one end of the piston rod extending to the back of the piston is located inside one end of the cylindrical driven shaft, and the base of the forward / reverse switching shaft and the back of the piston It is preferred that the spring disposed between the flange-shaped end and the flange-shaped end is configured to always be able to compress and expand within the driven shaft.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a forward / reverse switching device according to the present invention will be described with reference to an embodiment shown in the drawings. As shown in FIGS. It comprises a forward / backward switching shaft 4 of a vibrating device 3 provided on a compaction plate 2 and a forward / backward switching hand pump 6 provided above an operation handle 5 of the vibration compacting machine 1. As shown in FIG. 1, a hydraulic hose is provided between a hydraulic cylinder 7 provided at one end coaxially with the forward / reverse switching shaft 4 in a vibration body case 3a for accommodating the vibration generating device 3, and a forward / reverse switching hand pump 6. 8 are connected.

The vibrating device 3 has a drive shaft 11 to which rotation is transmitted from the engine 9 of FIG. 2 via a pulley 10, and a driven shaft 12 disposed in parallel with the drive shaft 11.
An eccentric pendulum 13 is fixed to the drive shaft 11 and a similar eccentric pendulum 14 is attached to the driven shaft 12.
3 is mounted so that the phase can be changed.

A driven gear 16 is provided at a central portion of the driven shaft 12 so as to be rotatable with respect to the shaft 12 and to be immovable in the axial direction. The rotation is transmitted from a drive gear 15 fixed to the center of the motor. Further, the driven gear 16 is provided with a spiral groove 18 which is inclined with respect to the axis of the boss 17 on the inner wall of the boss 17.

On the other hand, the driven shaft 12 is formed in a cylindrical shape, and in the portion where the driven gear 16 is located, elongated holes 19 are formed in opposing shaft walls along the axial direction, respectively. The forward / reverse switching shaft 4 is inserted into the driven shaft 12 so as to be rotatable and movable in the axial direction.

The forward / reverse switching shaft 4 includes a base shaft portion 20 having a thickness which slides on the inner peripheral surface of the driven shaft 12 and a vibration generator case 3a.
The piston 21 is slidably inserted into the hydraulic cylinder 7 protruding from one end of the piston 21 and a spring 22 disposed between the base shaft portion 20 and the piston 21.

A piston rod 21a having a flange-shaped end 23 having the same diameter as the base shaft portion 20 at the rear end is rotatably extended on the rear surface of the piston 21 via a bearing 21b, and moves forward and backward. As shown in FIG. 1, the piston 2
1 is pushed out to the outermost (rightward) position in the hydraulic cylinder 7, the rear flanged end 23 is located inside one end of the cylindrical driven shaft 12, and the forward / reverse switching shaft 4 The spring 22 arranged between the base shaft portion 20 and the flange-shaped end portion 23 of the piston rod 21a is configured so that compression and extension can be repeated within the driven shaft 12 at all times.

The base shaft portion 20 of the forward / reverse switching shaft 4 includes:
A pin 24 is embedded so as to be orthogonal to the axial direction of the switching shaft 4, and both ends of the pin 24 pass through the elongated hole 19 of the driven shaft 12 and engage in the spiral groove 18 in the inner wall of the driven shaft 12. I agree.

When no external hydraulic pressure acts on the hydraulic cylinder 7 in which the piston 21 at one end of the forward / reverse switching shaft 4 is inserted, the rotation from the drive gear 15 is transmitted to the driven gear 16. And the forward / reverse switching shaft 4
Since both ends of the pin 24 penetrate through the elongated hole 19 of the driven shaft 12 and engage in the spiral groove 18 on the inner wall of the driven gear 16, the lead angle of the spiral groove 18, the lead angle direction, and the driven gear 16 Along with the rotation direction, a mechanical return force that is pushed rightward in FIG. 1 is applied. The state where the forward / reverse switching shaft 4 has moved to the far right in the drawing is the driven shaft 1.
This means that the second eccentric pendulum 14 has rotated forward or backward with respect to the eccentric pendulum 13 of the drive shaft 11, for example, to a phase position where the eccentric pendulum 13 travels at the fastest speed.

On the other hand, the hydraulic cylinder 7 into which the piston 21 at one end of the forward / reverse switching shaft 4 is inserted is connected to the front end connection port 25 of the forward / reverse switching hand pump 6 and the hose 8 provided outside.
Connected through. The forward / reverse switching hand pump 6 receives the hose 8 from the inside of the hydraulic cylinder 7 when the forward / reverse switching shaft 4 in the driven shaft 12 receives a mechanical rightward return force by the spiral groove 18 of the driven gear 16. And the mechanical return force is transmitted through the shaft, and overcomes the mechanical return force to move the forward / reverse switching shaft 4 as shown in FIG.
It has a function to push back in the opposite left (reverse) direction.

As the forward / reverse switching hand pump 6, as shown in FIG. 3, for example, the one disclosed in Japanese Patent Application Laid-Open No. 2000-17607 can be used. The hand pump 6 is provided in a pump body 26 mounted on an upper end of the operation handle 5 of the body, and a cylinder 27 provided at a tip (left side in FIG. 3) of the body 26.
And a piston 28 inserted into the cylinder 27,
An oil chamber 29 provided at the other end (right side in FIG. 3) of the pump body 26, and a forward / reverse lever 3 pivotally mounted in the oil chamber 29
0 and a cam 33 having a roller 34 in contact with a rod 32 protruding from the piston 28 on a rotation shaft 31 of the forward / reverse lever 30, and a connection port 25 provided at the tip of the piston 28 vibrates. It is electrically connected to the hydraulic cylinder 7 of the device 3 via a hose 8.

The forward / reverse levers 30 are provided at both ends of a rotating shaft 31 which is mounted in an oil chamber 29 at the other end of the body 26 in a direction perpendicular to the axial direction of the cylinder 27. Is rotated between a forward position indicated by a dotted line and a reverse position indicated by a chain line. As shown by the solid line in FIG. 3, the relationship between the cam 33 provided on the rotating shaft 31 and the piston 28 is such that the cam 3
3 rotates rightward, and the piston 28 receives a mechanical return force from the direction of the forward / reverse switching shaft 4 of the vibration generating device 3 to protrude rightward, and rotates the lever 30 in the reverse direction as shown by a chain line. When it moves, the cam 33 rotates to the left and the piston 2
8 is configured to be pushed to the left side in opposition to the mechanical return force from the forward / reverse switching shaft 4 direction of the vibration generator 3.

The piston 28 is provided so as to be pushed in the direction of an oil chamber 29 provided with a lever rotation shaft 31 by a spring 35 disposed on the connection port 25 side in the cylinder 27. The piston 28 is provided with a hollow portion 36 at the end on the connection port 25 side (left side in FIG. 3), and has a smaller inner diameter than the hollow portion 36 on the lever rotation shaft 31 side of the hollow portion 36. A hole 37 is provided,
The rod 32 is inserted into the hole 37 so that the shaft end 32a protrudes toward the lever rotation shaft 31 side. further,
As shown in FIG. 3, outside the hole 37 in the piston 28, a pressure oil flow path 38 communicating the lever rotation shaft 31 side of the piston 28 with the inside of the hollow portion 36 is provided in parallel with the hole 37. Have been.

The rod 32 is provided with a ball 39 at the end on the connection port 25 side, and a flange 40 is provided on the outer peripheral surface of the ball 39 closer to the lever rotation shaft 31 side. The rod 32 is prevented from moving in the direction of the lever rotation shaft 31 by the engagement of the step 40 with the step portion 41 at the boundary between the hollow portion 36 and the hole 37.

At the end of the rod 32 having the ball 39 on the connection port 25 side, there is provided a valve seat 43 having a flow path 42 for closing the end of the piston hollow portion 36 on the connection port 25 side. The inside of the seat 43 and the flange 4 of the rod 32
A spring 4 weaker than the spring 35 between 0 and
When the rod 32 is pushed toward the lever rotation shaft 31 by the spring 44, the ball 3
9 is separated from the valve seat flow path 42, and a flow path for pressure oil is formed between the left connection port 25 side and the right oil chamber 29 side in FIG.

As described above, FIG. 3 shows a state in which the forward / reverse lever 30 is rotated to the forward position. In this state, the cam 33 is rotated to the right in the drawing, and the piston 2 is rotated.
8 moves to the right side in the cylinder 27 by receiving the pressing force of the left spring 35 and the pressurized oil by the mechanical return force of the vibrating device 3 from the forward / reverse switching shaft 4 direction, and the airframe moves in the fastest forward state. To run. In this fastest forward position, the rod 3
Since the valve seat 2 is pushed rightward by the spring pressure of the spring 44, the valve seat passage 42 is opened, and the pressure oil in the cylinder 27 flows toward the oil chamber 29 through the passage 38. Note that, in this state, the forward / reverse switching shaft 4 of the vibration generating device 3 is
As shown in FIG. 5A, the driven shaft 12 and the hydraulic cylinder 7 have moved to the right.

On the other hand, when the forward / reverse lever 30 of the forward / reverse switching hand pump 6 is rotated in the direction of the reverse position as shown in FIG. 5b, and the piston 21 in the hydraulic cylinder 7 is pushed toward the left driven shaft 12 as shown in FIG. 5B.

As shown in FIG. 5B, when the piston 21 in the hydraulic cylinder 7 is pushed to the left by hydraulic oil from the direction of the hand pump 6 for forward / reverse switching, the forward / backward switching shaft 4 is connected to the piston 21 and the base shaft. Since the spring 22 is interposed between the piston 21 and the piston 21, the pushing force of the piston 21 is not directly transmitted to the base shaft portion 20 as it is, but part of the base shaft portion 20 is absorbed by the intermediate spring 22 and the base shaft portion 20 The driven gear boss 17 is moved to a shorter distance than the moving amount, that is, to an intermediate portion of the spiral groove 18.

As shown in FIG. 5B, the fact that the base shaft portion 20 is located at the intermediate portion of the spiral groove 18 in the driven gear boss 17 means that the aircraft has not yet started to reverse, so to speak, It has been moved to the neutral position. On the other hand, in this state, since the pushing force of the hydraulic oil from the direction of the hand pump 6 for forward / reverse switching is maintained in the hydraulic cylinder 7, this time, as shown in FIG. The spring force of the spring 22 pushes the base shaft portion 20 to the left side of the spiral groove 18, whereby the body moves backward.

[0029]

According to the forward / reverse switching device of the present invention, the driven shaft 12 of the vibration generating device 3 and the forward / backward switching shaft 4 provided in the hydraulic cylinder 7 coaxial with the driven shaft 12 are connected to the piston 21.
, A base shaft portion 20, and a spring 22 interposed therebetween.
Therefore, even if the operator pushes the lever 30 to the reverse position at a stretch while resisting the mechanical return force,
Rather than the piston 21 directly moving the base shaft portion 20 to the left side position of the spiral groove 18 in the driven gear boss 17 and immediately switching to reverse, the piston 21 compresses the spring 22 in the hydraulic cylinder 7 and Then, the base shaft portion 20 is moved to the left side position of the spiral groove 18 in the driven gear boss 17 by the repulsive force of the spring, and the reverse movement is started.

Therefore, since the mechanical return force of the vibrating device is small as in the case of a lightweight type compacting machine having a body weight of 300 kg or less, the worker resists the lever 30 against the mechanical return force and immediately moves to the reverse position. According to the forward / reverse switching device of the present invention, even if the operation of pushing the spring 22 is performed, the spring 22 of the forward / reverse switching shaft 4 first absorbs the impact force, and then the repulsive force of the spring 22 The movement of the base shaft portion 20 in the reverse direction is to be performed, and the phase of the eccentric pendulum in the reverse direction is smoothly performed while gradually resisting the mechanical return force, and the aircraft body smoothly shifts to the reverse direction. Can be. As a result, according to the apparatus of the present invention, when the lever is pushed at a stroke to the reverse position, which occurs in the conventional type of a compacting machine, the eccentric pendulum moves from the forward direction to the reverse direction rapidly. By changing, the fuselage tilts backward, and the problem of the rolled board kicking up the roadbed can be reliably eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view showing the internal structure of a vibration generating device including a forward / reverse switching shaft according to the present invention.

FIG. 2 is a side view of a vibration compaction machine provided with the vibration generating device of the present invention.

FIG. 3 is a side view of the forward / reverse switching hand pump at the time of forward operation.

FIG. 4 is a side view of the hand pump during forward / reverse switching when the vehicle is in a reverse operation.

FIGS. 5A and 5B are partial plan views showing the state of movement of the forward / reverse switching shaft according to the present invention from forward movement to reverse movement, where a is the fastest forward movement state, b is neutral, and c is the fastest backward movement state.

FIG. 6 is a side view showing a phenomenon that occurs at the time of switching the backward movement of the conventional vibration compacting machine.

[Explanation of symbols]

 1: Vibration compaction machine 2: Rolling plate 3: Vibration device 3a: Vibration body case 4: Forward / reverse switching shaft 5: Operation handle 6: Forward / reverse switching hand pump 7: Hydraulic cylinder 8: Hydraulic hose 9: Engine 10 : Pulley 11: Drive shaft 12: Drive shaft 13: Drive shaft eccentric pendulum 14: Drive shaft eccentric pendulum 15: Drive gear 16: Drive gear 17: Boss 18: Spiral groove 19: Slot 20: Base shaft 21: Piston 22: Spring 23: Flange-shaped end 24: Pin 25: Tip connection port 26: Pump body 27: Cylinder 28: Piston 29: Oil chamber 30: Forward / reverse lever 30: Rod 31: Lever rotation axis 32: Rod 33: Cam 34 : Roller 35: Spring 36: Hollow part 37: Small hole 38: Pressure oil flow path 39: Ball 40: Flange 41: Step part 42: Flow path 43: Valve seat 44 Spring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Mochiki 3825 Kurohama, Hasuda City, Saitama Prefecture (72) Inventor Shoka Okayasu 1718-19 Leapto, Hasuda City, Saitama Prefecture (72) Inventor Yoshiho Harashima 1 Kurihara, Kuki City, Saitama Prefecture -5-10 F term (reference) 2D052 AD13 AD15 AD19 BC07 BC09 CA15 CA16 DA33 5D107 AA14 AA16 BB10 DD10 DE10

Claims (2)

[Claims] 1. A forward / reverse switching device provided on a forward / backward switching shaft of an exciter, comprising: a cylindrical driven shaft provided with an eccentric pendulum for changing a phase with respect to a drive shaft eccentric pendulum; A hydraulic cylinder protruding from one end of an exciter case on a coaxial line, and a forward / reverse switching shaft inserted into the driven shaft and the hydraulic cylinder, wherein the forward / backward switching shaft is Both ends of a pin protruding in a direction perpendicular to the axial direction through a piston inserted in the inside of the piston and an elongated hole provided along the axial direction of the driven shaft, and a boss of a driven gear fitted to the outer periphery of the driven shaft. A forward / backward switching device for a vibration compaction machine, comprising: a base shaft portion in a driven shaft engaged with a spiral groove of an inner wall; and a spring disposed in the driven shaft between the base shaft portion and a piston. 2. The forward / reverse switching shaft is driven by a mechanical return force generated on the forward / reverse switching shaft by rotation of a spiral groove in the inner wall of the boss of the driven gear.
Even when the piston is pushed out to the outermost position in the hydraulic cylinder, the flanged end of one end of the piston rod extending to the back of the piston is located inside one end of the cylindrical driven shaft, and the base shaft of the forward / reverse switching shaft is provided. 2. A spring disposed between said portion and said flange-shaped end on the back side of said piston is configured to always be able to compress and extend within said driven shaft.
Forward / backward switching device for vibration compaction machines.