JPH05237459A - Vibration generator - Google Patents

Abstract

PURPOSE:To arbitrarily and steplessly alter vibromotive force even at the time of operation by arranging a plurality of rotary shafts and one phase adjusting shaft and forcibly moving the phase adjusting shaft to generate phase difference between a phase fixing gear and a phase adjusting gear. CONSTITUTION:First - fourth rotary shafts 21-24 on which a plurarity of eccentric wts. 51A-52B and a plurality of transmission gears 31-34 are externally fixed are arranged. A phase adjusting shaft 25 to which a phase fixing gear 36 made relatively non-rotatable and a phase adjusting gear 35 made relatively rotatable are externally fitted so as to be prevented from moving in the axial direction of the shaft 25 is arranged. The transmission gears 31, 32 are meshed with the phase fixing gear 36 through an intermediate gear 37 and the transmission gears 33,34 are meshed with the phase adjusting gear 35. Spiral recessed parts fitted each other are formed to the inner peripheral part of the phase adjusting gear 35 and the outer peripheral part of the phase adjusting shaft 25. By moving the phase adjusting gear in the axial direction by a hydraulic cylinder 50, phase difference is generated between the phase fixing gear 36 and the phase adjusting gear 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator applied to a vibrating pile driver, various shakers, sieving devices, and the like, and more particularly to a vibration force or an amplitude obtained by rotating an eccentric weight. It relates to those which can be arbitrarily and steplessly changed.

[0002]

2. Description of the Related Art As a vibration generator utilizing the centrifugal force generated by rotating an eccentric weight, an even number of pairs of rotating shafts to which an eccentric weight is attached are arranged in parallel with each other in a casing member. Eccentricity attached to each rotating shaft by supporting and supporting transmission gears on each rotating shaft, meshing adjacent gears, and rotating one rotating shaft group and the other rotating shaft group in opposite directions. It is generally common to offset the horizontal component of the centrifugal force generated in the weight and add the vertical component of the centrifugal force so that, for example, a vertical component can be applied to the casing member by this vertical component. Are known.

In such a vibration generator, by supporting the casing member via a spring or a damper, the entire vibration generator is vibrated at a frequency corresponding to the rotation speed of the rotary shaft. Therefore, by driving a vibration generator by supporting a pile, such as a steel sheet pile, on a casing member via a chuck or the like, a pile driving operation or a pile extracting work can be performed, and further, such a vibration generator can be shaker or sieved. By incorporating it into the device, it is possible to perform stirring work and sieving work.

[0004]

In the conventional vibration generator as described above, since the eccentric weight is fixed to the rotary shaft, it is not easy to arbitrarily change the exciting force or the amplitude during operation. . However, in such a vibration generator, the driving force required to rotate the eccentric weight in the stationary state at the start of operation is significantly larger than that after the eccentric weight reaches the rated rotation speed, so the stationary state If the drive force required for the eccentric weight to reach the rated rotation speed can be reduced, the drive source such as the motor can be downsized, and the efficiency of using energy such as power consumption can be significantly improved. it can. Therefore, there is a demand for a measure that can easily reduce the driving force required for rotation at the beginning of rotation of the rotary shaft.

Further, for example, in a vibration generator applied to a vibrating pile driving machine, in order to improve workability of pile driving and pulling out of the pile, depending on the state of the ground into which the driven pile penetrates, etc. To easily change the vibration force or amplitude,
Alternatively, there is also a demand for measures to prevent the resonance phenomenon that occurs at the time of starting and braking. To meet the above-mentioned demand, some vibration generators with variable excitation force or variable amplitude are currently considered, but all of them have a complicated structure and a large number of parts.

In view of the above point, the present invention provides a vibration generator capable of changing the exciting force or amplitude arbitrarily and steplessly even during operation, and having a simple structure, rational and easy to manufacture. The purpose is to provide.

[0007]

In order to achieve the above object, a vibration generator according to the present invention is axially supported by a casing member in parallel with each other, and an eccentric weight and a transmission gear are externally fitted and fixed to the respective members. The first rotating shaft, the second rotating shaft, the third rotating shaft, and the fourth rotating shaft, and the shafts are rotatably supported in parallel with the respective rotating shafts, and the phase-fixed gears are relatively unrotatable and the phase is adjusted. The gears each have a phase adjusting shaft fitted so as to be rotatable relative to each other and prevented from moving in the axial direction, and the transmission gears on the first rotating shaft and the second rotating shaft are meshed with each other. At the same time, the transmission gears on the third rotating shaft and the fourth rotating shaft are meshed with each other, and the movement in the axial direction is blocked by either the third rotating shaft or the fourth rotating shaft. Rotation of one of the phase fixing gear and the phase adjusting gear is performed by the first An intermediary gear that transmits to either the rolling shaft or the transmission gear on the second rotating shaft is rotatably fitted on the outside, and further, any one of the transmitting gear on the third rotating shaft and the fourth rotating shaft is attached. Phase changing means is provided which is meshed with the other of the phase fixing gear and the phase adjusting gear, and which rotates the phase adjusting gear relative to the phase adjusting shaft relative to the phase adjusting shaft.

Another aspect of the vibration generator according to the present invention is a first rotary shaft, which is axially supported in parallel with each other by a casing member, and on which an eccentric weight and a transmission gear are externally fitted and fixed, respectively. The second rotary shaft, the third rotary shaft, the fourth rotary shaft, and the respective rotary shafts are rotatably supported in parallel with each other, and the phase-fixing gear is relatively unrotatable and the phase-adjusting gear is relatively rotatable. Has a phase adjusting shaft that is externally fitted in a state where movement in the direction is blocked, the transmission gears on the first rotating shaft and the second rotating shaft are meshed with each other, and one of them is in the above phase. One of the fixed gear and the phase adjustment gear is meshed with each other, and the transmission gears on the third rotation shaft and the fourth rotation shaft are meshed with each other,
One of them is meshed with the other of the phase fixing gear and the phase adjusting gear, and there is provided a phase changing means for rotating the phase adjusting gear relative to the phase adjusting shaft in relation to the phase adjusting shaft. Be done.

In the vibration generator according to the present invention, various types of phase changing means can be adopted. For example, a combination of driving means for forcibly moving the phase adjusting shaft in the axial direction and motion converting means for converting the linear movement of the phase adjusting shaft in the axial direction into relative rotation of the phase adjusting gear is conceivable. The phase changing means is provided on the outer peripheral portion of the phase adjusting shaft with a predetermined turning direction or a spiral groove or groove, and on the inner peripheral portion of the phase adjusting gear. And a spiral convex or concave portion slidably fitted in a circular groove or convex groove, and a driving means for forcibly moving the phase adjusting shaft in the axial direction. Or the phase changing means is provided with a pin erected on the phase adjusting shaft so as to project in the radial direction, and a spiral elongated hole continuous with the phase adjusting gear and into which the pin is inserted. With extended boss part Those composed of the phase adjustment shaft and a driving means to forcibly move axially, from, and the like.

As another aspect of the vibration generator according to the present invention, the phase adjusting shaft is not divided into a first adjusting shaft and a second adjusting shaft, and the first adjusting shaft is the second adjusting shaft. A configuration in which relative movement and relative rotation are arranged in the axial direction via a first movement conversion unit that converts linear movement into rotational movement with respect to the adjustment axis, and they are moved so as to be inserted and removed on the same axis. Alternatively, the phase adjusting gear can be configured to rotate relative to the first adjusting shaft or the second adjusting shaft. In this case, even if the phase adjusting gear is externally fitted to either one of the first adjusting shaft and the second adjusting shaft through the second motion converting means for converting the linear motion into the rotary motion. It is also possible to adopt a configuration including both the first and second motion converting means.

Further, as another aspect of the vibration generator according to the present invention, a fluid working chamber is formed between the outer peripheral portion of the phase adjusting shaft and one of the phase adjusting gears, and the fluid working chamber is formed in the fluid working chamber. By supplying and discharging the fluid, they function as phase changing means, and the phase adjusting gear may be rotated relative to the phase adjusting shaft. In this case, the fluid working chamber can be partitioned by the fixed partition wall portion fixed to the phase adjusting shaft and the movable partition wall portion fixed to the phase adjusting gear, and the fluid working chamber can be configured like a rotary cylinder.

[0012]

In the vibration generator according to the present invention having the above-mentioned structure, the first phase adjusting shaft is forced to move in the axial direction or the first phase adjusting shaft which constitutes the phase adjusting shaft. And by forcibly moving one of the second adjustment shafts in the axial direction with respect to the other,
Alternatively, by supplying and discharging the fluid to and from the fluid working chamber, the phase adjusting gear rotates relative to the phase adjusting shaft.

When the phase adjusting gear rotates relative to the phase adjusting shaft in this manner, the eccentric weights on the third rotating shaft and the fourth rotating shaft to which the rotation of the phase adjusting gear is transmitted are fixed in phase. A first rotation shaft and a second rotation shaft to which the rotation of the gear is transmitted.
Is advanced or retarded relative to the eccentric weights on the rotation axis, and a phase difference occurs between the eccentric weights. As a result, the horizontal component force generated in each eccentric weight is canceled out at all times, whereas the total value of the vertical component force generated in each eccentric weight is eccentric on the first rotating shaft and the second rotating shaft. The weight is changed according to the phase difference between the weight and the eccentric weights on the third rotation axis and the fourth rotation axis. As a result, the vibration force or the vibration force applied to the casing member via each rotation axis or The amplitude is changed.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First Embodiment: FIGS. 1 and 2 are a perspective view and a development view showing a main part of a first embodiment of a vibration generator according to the present invention.
FIG. 3 is a front view showing an example of a vibrating pile driver to which the vibration generator of the embodiment shown in FIGS. 1 and 2 is applied.

In FIG. 3, a vibrating pile driver 1 includes a hanger 5 having a hooking portion for hooking a hook 2 of a hanging means such as a crane, and four guides hanging from the hanger 5. A shock absorber 7 having a rod 6 and a pair of upper and lower coil springs 8 and 9 that are compressed to the rod 6, an electric motor 14 as a drive source supported by the hanger 5 via the shock absorber 7, a casing member 20, The vibration generator 10 of the present embodiment, which includes an exciting force generator disposed inside the casing member 20, a belt 17 for power transmission, pulleys 18 and 19, and the like, and is provided below the vibration generator 10. Also, it comprises a chuck 12 for holding a pile of steel sheet pile or the like. The vibrating pile driving machine 1 is a conventionally known one except for a vibrating force generating portion which will be described later, and not only an electric motor but also any means such as a hydraulic motor can be used as a drive source, and a shock absorber is also illustrated. Other than the above, appropriate ones can be used.

As shown in detail in FIGS. 1 and 2, the vibrating force generating portion provided on the casing member 20 has a first rotating shaft 21 and a portion substantially right next to the first rotating shaft 21. A second rotating shaft 22 arranged in parallel, to which the rotational driving force from the electric motor 14 is transmitted via the pulley 19;
The third rotating shaft 23 and the fourth rotating shaft 24, which are arranged below and parallel to the first rotating shaft 21 and the second rotating shaft 21, 22 and the third rotating shaft 23 and the fourth rotating shaft 23, 24, respectively. Phase adjusting shaft 2 arranged substantially parallel to them just below the intermediate position
5 and.

In this embodiment, the phase adjusting shaft 25 is shown below the third and fourth rotating shafts 23 and 24, but the phase adjusting shaft 25 does not correspond to the rotating shafts 21 and 24.
It will be clear that its position is not limited below it, provided that it is arranged parallel and rotatable with respect to 22, 23, 24. As shown in FIG. 2, each of the rotating shafts 21 to 24 has both ends at the side wall 20 of the casing member 20.
a and 20b are rotatably supported by bearings 26 and 27,
The first transmission gear 3 is attached to each of the rotating shafts 21 to 24.
The first, second transmission gear 32, the third transmission gear 33, and the fourth transmission gear 34 are externally fitted and fixed by the key 43. Of these transmission gears 31 to 34, the first rotary shaft 2
The transmission gears 31, 32 on the first and second rotating shafts 22 are meshed with each other, and the third rotating shaft 23 and the fourth rotating shaft 23
The transmission gears 33 and 34 on the rotary shaft 24 are meshed with each other.

In addition to the above-mentioned third transmission gear 33, the third rotating shaft 23 has a phase-fixing gear fixed to a phase adjusting shaft 25, which will be described later, in a state in which axial movement is blocked. The rotation is controlled by the second transmission gear 32 on the second rotation shaft 22.
The intermediary gear 37 that transmits to the outside is rotatably fitted over the bearing 45. Further, the eccentric weights 51B and 5B are provided at the central portions of the first rotary shaft 21 and the third rotary shaft 23.
The eccentric weights 51Aa and 51Ab (51B) are fixed to the second rotary shaft 22 and the fourth rotary shaft 24 in the vicinity of both ends thereof.
Aa and 51Ab are combined and reference numeral 51A is used) and 52Aa and 52Ab (52Aa and 52Ab are used together and reference numeral 52A is used), which are integrally fitted and fixed by a spline 29.

The rotary shafts 21 to 24 and the transmission gear 31
To 34 and the eccentric weights 51A, 52A, 51B, 52B, the fixing means is not limited to the connection by the key or the spline as shown here, and any means can be used as long as they can function as the fixing means. But it should be clear. On the other hand, on one end side of the phase adjusting shaft 25, a double-acting type cylinder 50 with an automatic lock device is arranged as a driving means for moving the phase adjusting shaft 25 in the casing member 20. The transmission of the propulsive force from the cylinder 50 to the phase adjustment shaft 25 is performed between the box-shaped connection portion 55 provided at the tip of the piston rod of the cylinder 50 and the T-shaped connection portion 56 provided at one end of the phase adjustment shaft 25. It is designed to be performed via a pair of thrust bearings 58 which are interposed. It should be noted that the cylinder 50 has a supply / discharge port 66 for supplying / discharging hydraulic oil from the outside to the oil chambers before and after the cylinder 50.
68 is provided.

On the other end of the phase adjusting shaft 25, an appropriate position detector is arranged to control the amount of movement of the phase adjusting shaft 23. In this embodiment, the casing member 2
The position detector 60 of the differential transformer type, which is attached to No. 0 and into which the iron core or the like provided at the other end of the phase adjusting shaft 25 is inserted, is arranged. It is also possible to use.

The phase adjusting shaft 25 is provided with a spiral concave-convex portion 53 having a relatively gentle turning gradient on the outer peripheral portion closer to one end side from the center thereof in a predetermined turning direction (right-hand screw type or left-hand screw type). ), And a spline 54 is provided closer to the other end side than the center thereof. The phase adjusting gear 35 and the phase fixing gear 3 are attached to the phase adjusting shaft 25.
6 and 6 are arranged. The phase adjusting gear 35 and the phase fixing gear 36 are rotatably supported by bearing saddles 39 and 40 provided in association with the casing member via bearings 47 and 48, but are phase-shifted in a state in which axial movement is blocked. The phase adjustment gear 35 is fitted on the adjustment shaft 25.
Is provided with a spiral concavo-convex portion 46 slidably fitted to the spiral concavo-convex portion 53 provided on the phase adjusting shaft 25 on the inner peripheral portion thereof, and the third transmission gear 33 on the third rotating shaft 23 is provided. Is engaged with. Further, the phase-fixing gear 36 is provided with a spline-shaped concave-convex portion 49 on its inner peripheral portion, which is externally fitted and fixed to the spline 54 provided on the phase-adjusting shaft 25. It is meshed with the gear 37.

The above-mentioned eccentric weights 51A, 52A, 5
1B and 52B each have a central angle of 180, for example.
Approximate fan shape (semi-circular) of eccentric weight 51A, 52
One thickness of A is about half of the eccentric weights 51B and 52B, and the eccentric weights 51A and 52A and the eccentric weights 51B and
The weight and shape of the 52B are determined so that the eccentric moments are the same, and the 52B is positioned so as to be balanced in the left-right direction.

In this embodiment, as described above, the eccentric weight 51 is used.
By setting the arrangement and shape of A, 52A, 51B, 52B, the radius of gyration of each transmission gear 31-34 can be made smaller than that of the eccentric weights 51A, 52A, 51B, 52B. Depending on each rotation axis 2
The distance between 1 and 24 can be reduced, and the device can be made compact.

However, the eccentric weights 51A, 52A,
The shapes, thicknesses, arrangements, etc. of the 51B and 52B are not limited to those described above, and the weight, shape, and positioning are performed so that the eccentric moments are the same and that the left and right are balanced. Of course, it is good. In addition, each gear 31 to 36
The specifications, such as the number of teeth, are the same, and they rotate at a constant speed in the meshed state.

In the vibration generator 10 of the present embodiment having the above-described structure, the rotational driving force of the motor 14 is transmitted from the pulley 19 to the second rotary shaft 22 via the belt 17.
→ Second transmission gear 32 → First transmission gear 31 and intermediate gear 37 → Phase fixing gear 36 → Phase adjusting shaft 25 → Spiral concavo-convex portions 53 and 46 → Phase adjusting gear 35 sequentially transmitted to the first rotation Shaft 21, second rotating shaft 22, and phase adjusting shaft 25
Rotate in synchronization with each other, and the rotation of the phase adjustment shaft 23 is sequentially transmitted to the phase adjustment gear 35 → the third transmission gear 33 and the third rotation shaft 23 → the fourth transmission gear 34 and the fourth rotation shaft 24. To be done.

Here, when the phase adjustment shaft 25 is forcibly moved in the axial direction by the cylinder 50, the spiral concavo-convex portion 53 provided on the outer peripheral portion of the phase adjustment shaft 25 and the inner peripheral portion of the phase adjustment gear 35 are provided. The phase-adjustment gear 35 is engaged with the spiral concavo-convex portion 53 provided on the.
By the circumferential component force of the phase adjustment shaft 23, the phase adjustment shaft 23 is relatively rotated with respect to the phase adjustment gear 36 according to the moving distance of the phase adjustment shaft 23, and the phase thereof is advanced or delayed. Rotate together.

When the phase of the phase adjusting gear 35 changes with respect to the phase fixing gear 36 in this way, the phases of the third and fourth rotating shafts 23, 24 and the eccentric weights 52B, 52A attached thereto are changed. The eccentric weights 51B and 51A attached to the first and second rotating shafts change at the same angle. As a result, the vibration force or amplitude applied to the casing member 20 via the rotary shafts 21 to 24 is changed.

In this case, the horizontal component of centrifugal force generated in the eccentric weights 51A, 52A, 51B, 52B attached to the rotary shafts 21 to 24 is canceled and the vertical component of centrifugal force is added. The vertical component force gives the casing member 20 a vertical exciting force or amplitude.
Then, as shown in FIG. 4A, the eccentric weight 51
The phase difference θ between A and 51B and eccentric weights 52A and 52B is 18
When it is set to 0 °, the curves a and b in FIG.
As shown by, the excitatory forces or amplitudes obtained from them cancel each other out to zero. On the other hand, the phase adjustment shaft 25 is moved to move the phase adjustment gear 35 to the phase fixed gear 3
When rotated by 180 ° with respect to 6, the eccentric weights 51A and 51B and the eccentric weights 52A and 52B as shown in FIG. 4C.
The phase difference θ of 0 becomes 0, and as shown in FIG. 5C, the amount as the sum of the exciting force or the amplitude obtained by only one eccentric weight, that is, the amount obtained by only one eccentric weight is 2
A doubling excitatory force or amplitude (shown by dashed line c in FIG. 5C) is obtained. Note that FIG. 4B shows a case where the phase difference θ is 90 ° which is between the above-mentioned FIG. 4A and FIG. 4C, and as in the case of FIG. The amount of exciting force or amplitude indicated by c is obtained.

Therefore, for example, when the vibration generator 10 is started, the eccentric weights 51A and 52B and the eccentric weight 52 are
The phase difference θ between A and 52B is 18 as shown in FIG. 4A.
If it is set to 0 °, the state becomes the same as when a balanced flywheel is started, and the phase difference θ between these is gradually changed from 180 ° to 0 during the period until the electric motor 14 reaches the rated rotation speed after starting. If the phase adjusting shaft 23 is moved so as to be decreased, the eccentric weights can be smoothly rotated without requiring a large driving force. Therefore, the electric motor 14 can be sufficiently small in size. It can fulfill its role and save energy.

In the above example, an electric motor is used as the power source for generating the exciting force, but the power source is not limited to this, and a hydraulic motor or the like may be used. Further, although the cylinder 50 is used as the driving means for the phase adjusting shaft 25, instead of this, for example, a driving means composed of a motor, a worm gear, a thrust shaft and the like may be used.

Furthermore, it goes without saying that the arrangement of the eccentric weights and the gears, and the arrangement of the rotary shafts 21 to 23 and the phase adjusting shaft 23 can be changed appropriately. In this case, for example, by disposing the phase adjusting shaft 25 between the first and second rotating shafts 21 and 22 and the third and fourth rotating shafts 23 and 24,
As shown in the exploded view of FIG. 6, the phase-locking gear 36 can be directly meshed with the second transmission gear 32, and thus, in such a case, without using the intermediate gear 37 shown in FIG. The effect similar to the example is obtained.

Second Embodiment: FIG. 7 is a sectional view showing a main part of a second embodiment of a vibration generator according to the present invention, and FIG. 8 is a partially cutaway perspective view thereof. In the second embodiment, a portion corresponding to the phase adjusting shaft 25 in the first embodiment is a phase adjusting shaft 70 including a first adjusting shaft 71 and a second adjusting shaft 72 having a two-divided configuration. , This phase adjustment shaft 7
Since the parts other than 0 and its peripheral parts are common to the above-mentioned first embodiment, such parts are designated by common reference numerals and their duplicate description is omitted.

The first adjusting shaft 7 constituting the phase adjusting shaft 70
The first adjustment shaft 71 of the first and second adjustment shafts 72 is
As shown in detail in FIGS. 7 and 8, a tubular shaft is formed, a spline 78 extending straight in the axial direction is formed on the outer peripheral portion thereof, and a first spiral uneven portion 73 is engraved on the inner peripheral portion thereof. One end thereof is connected to a tip end of a piston rod 65 of a hydraulic cylinder 50 described later via a bearing 69 in a rotatable state and in a state in which relative movement in the axial direction is blocked. Further, the second adjusting shaft 72 has a second outer peripheral portion on one end side which is fitted to the first spiral concavo-convex portion 73.
Spirally corrugated portion 74 is engraved, is connected to the first adjusting shaft 71 at the second spiral corrugated portion 74 portion, and the other end is connected to the side wall 20 b of the casing member via the bearing 42.
It is rotatably supported by.

A double-acting hydraulic cylinder 50 with an automatic locking device, which serves as a driving means for moving the first adjusting shaft 71 in the axial direction, is attached to a wall portion 20c attached to the casing member 20. It is installed. The hydraulic cylinder 50 has supply / discharge ports 66, 68 for supplying / discharging hydraulic oil from a hydraulic unit arranged outside, and the piston rod 65 thereof is moved forward / backward according to the supply / discharge amount of hydraulic oil. , To control the amount of movement of this piston rod 65,
Although not shown, for example, a position detector such as a differential transformer type is arranged.

On the outer peripheral side of the first adjusting shaft 71, the phase adjusting gear 35 meshing with the third transmission gear 33 is coupled to the spline 78 and externally fitted, and the second adjusting gear 71 is also fitted to the second adjusting gear 71.
A phase fixing gear 36 meshing with the second transmission gear 32 is fixed by a key 77 on the outer peripheral side of the adjusting shaft 72. In the vibration generator 10 of the present embodiment having the above-described configuration, the rotational driving force of the motor 14 is the belt 1
Via the second rotary shaft 22 → second transmission gear 32 → first transmission gear 32 and intermediate gear 37 → phase fixing gear 36.
→ second adjustment shaft 72 → second and first spiral concavo-convex portion 7
4, 73 → the first adjustment shaft 71 → the phase adjustment gear 35 are sequentially transmitted, and the first rotation shaft 21, the second rotation shaft 22, and the phase adjustment shaft 70 (the first adjustment shaft 71 and the second adjustment shaft) are transmitted. Axis 7
2) rotates synchronously, and the rotation of the phase adjustment shaft 70 causes the rotation of the phase adjustment gear 35 → the third transmission gear 33 and the third rotation shaft 23 → the fourth transmission gear 34 and the fourth rotation shaft 24.
Are sequentially transmitted to.

When the hydraulic cylinder 50 forcibly moves the first adjusting shaft 71 in the axial direction, the first adjusting shaft 71 is forced to move.
The first spiral concavo-convex portion 73 engraved on the inner peripheral portion of the adjustment shaft 71 and the second spiral concavo-convex portion 74 engraved on the outer peripheral portion of the second adjustment shaft 72 are fitted to each other. Therefore, the first adjustment shaft 7
The first and second adjustment shafts 72 have spiral concave and convex portions 73 and 74.
By the circumferential component force of the first adjusting shaft 71, the first adjusting shaft 71 rotates relative to the first adjusting shaft 71, and the phase adjusting gear 3 on the first adjusting shaft 71 rotates.
The phase of No. 5 is advanced or delayed with respect to the fixed phase gear 36 on the second adjustment shaft 72, and in this state, the phase adjustment gear 35 and the phase fixed gear 36 rotate integrally with the phase adjustment shaft 70.

When a phase difference occurs between the phase adjusting gear 35 and the fixed phase gear 36 in this way, the third and fourth rotary shafts 2 and 2 are different from the first and second rotary shafts 21 and 22.
3, 24 rotate relative to each other, and the first and second rotation shafts 21, 2
Eccentric weights 51B and 51A attached to the second eccentric weight 52 and eccentric weights 52 attached to the third and fourth rotating shafts 21 and 22.
A phase difference is generated between B and 52A, which causes the vibration force or the amplitude applied to the casing member 20 via each of the rotary shafts 21 to 24 to change, which is the same as in the first embodiment described above. The effect is obtained.

In the above description, in the above-mentioned embodiment, the first adjustment is provided as the first motion converting means for converting the linear motion into the rotary motion in order to give the phase adjustment gear 35 and the phase fixed gear 36 a phase difference. The first spiral concave-convex portion 73 is engraved on the inner peripheral portion of the shaft 71, and the second adjusting shaft 72 is also provided.
The second spiral fitting portion 73 fitted to the outer peripheral portion of the first spiral concave-convex portion 73.
However, the means for giving the phase difference to the phase adjusting gear 35 and the phase fixing gear 36 is not limited to this.

As another aspect, as shown in FIGS. 9 and 10, the first adjusting shaft 71 is engraved with the first spiral uneven portion 73 and the first spiral uneven portion is formed on the outer peripheral portion. 73
The second adjusting shaft 72 having the second spiral concave-convex portion 74 fitted therein is used, and the first adjusting shaft 71 is used as the second motion converting means for converting the linear motion into the rotary motion. The outer peripheral portion of the first spiral concavo-convex portion 7 formed on the inner peripheral portion thereof.
The first phase adjusting gear 35 is engraved with the third spiral concave-convex portion 75 having a phase opposite to that of the first phase adjusting gear 71 and is externally fitted to the first adjusting shaft 71.
The third outer surface of the first adjusting shaft 71 is engraved on the inner peripheral portion of the
Fourth spiral concavo-convex portion 76 that fits into the spiral concavo-convex portion 75 of
May be formed. In this case, a phase difference is given to the phase adjusting gear 35 and the phase fixing gear 36 by the double feeding means having the opposite phase, so that at least one of the first adjusting shaft 71 and the second adjusting shaft 72 is provided. It is possible to reduce the amount of movement in the axial direction by half.

As yet another aspect, the first motion converting means is not provided, and the first adjusting shaft 71 and the second adjusting shaft are connected by, for example, a spline connection that is relatively movable in the axial direction. The phase difference may be given to the pair of phase adjusting gears 35 and 36 only by the second motion converting means. Embodiment 3 FIGS. 11 and 12 are a partially cutaway front view and a perspective view showing a main part of a vibration generator according to a third embodiment of the present invention.

Also in this third embodiment, the portions corresponding to the respective portions of the above-mentioned first and second embodiments are designated by the common reference numerals and their duplicate description will be omitted. The phase adjusting shaft 90 of this embodiment is also below the third and fourth rotating shafts 23 and 24, parallel to them, and both ends thereof are bearings 69 and 4.
Is rotatably supported by the side walls 20a, 20b via 7 in a state in which relative movement in the axial direction is blocked,
As shown in detail in FIGS. 11 and 13, two hydraulic passages 91 and 92 are formed in the inside thereof, and one end portion of the hydraulic passages 91 and 92 is covered with a seal member 67 and a spacer 48.
9 is covered. Spacer 48 and cover member 49
The supply / discharge passage 9 communicating with the hydraulic passages 91, 92.
3, 94 are formed, and the drain passage 79 is connected to the rear end thereof. The supply / discharge passages 93, 94
Hydraulic fluid from an externally installed hydraulic unit is supplied to and discharged from the hydraulic system through a piping system in which a switching valve and the like are interposed, and the hydraulic fluid is supplied to a hydraulic working chamber 100 described later through the hydraulic passages 91 and 92. It is supplied and discharged from it.

A phase fixing gear 36 meshing with the second transmission gear 32 is externally fitted and fixed to the phase adjusting shaft 90 by means of a key 77, and a phase adjustment gear 35 meshing with the third transmission gear 33. Is externally fitted while being prevented from moving in the axial direction. The phase adjustment gear 35 is the phase adjustment shaft 9
It is possible to rotate relative to 0, one side of which is shown in FIG.
As shown in detail in FIG. 1 and FIG. 12, a working chamber forming member 99 is connected and surrounded by the outer periphery of the phase adjusting shaft 90 and the side portion of the phase adjusting gear 35 in the working chamber forming member 99. A sleeve-shaped hydraulic working chamber 100 is formed.
The hydraulic working chamber 100 is sealed with an appropriate sealing material or the like, and the inside thereof is, as shown in detail in FIG.
The fixed partition wall portion 95 fixed to the phase adjustment shaft 90 by the pin 11 and the bolt 13 and the movable partition wall portion 96 fixed to the phase adjustment gear 35 by the bolt 15 form the first working chamber 101 and the second working chamber 102. It is divided into One end of the hydraulic passage 91 is opened at the end of the first working chamber 101 on the fixed partition wall portion 95 side, and one end of the hydraulic passage 92 is opened at the end of the second working chamber 102 on the fixed partition wall portion 95 side.

In the vibration generator 10 of the present embodiment having the above-mentioned structure, in the state where the hydraulic oil from the hydraulic unit is filled in the hydraulic working chamber through the hydraulic passages 91 and 92, Belt 17 rotates
Via the second rotary shaft 22 → second transmission gear 32 → first
Of the first rotating shaft 2 through the transmission gear 31 and the intermediate gear 37 of the
The first and second rotating shafts 22 and the phase adjusting shaft 90 rotate in synchronization with each other, and the rotation of the phase adjusting shaft 90 causes the hydraulic working chamber 1 to rotate.
00 → phase adjustment gear 35 → third transmission gear 33 → fourth transmission gear 34 are sequentially transmitted.

Here, by switching the valve position of the hydraulic piping system, the hydraulic oil is discharged from the first working chamber 101 through the hydraulic passage 91 and the hydraulic passage 92 is supplied to the second working chamber 102, for example.
When the hydraulic oil is supplied through the movable partition wall portion 96, the movable partition wall portion 96 rotates around the phase adjustment shaft 90 together with the phase adjustment gear 35 (for example, from the state shown in FIG. 18A to the state shown in FIG. 18B). Therefore, the phase adjustment gear 35 rotates relative to the phase fixed gear 36, and a phase difference occurs between them, and in such a state, the phase adjustment gear 35 and the phase fixed gear 36
Rotates integrally with the phase adjustment shaft 90.

When a phase difference is generated between the phase adjusting gear 35 and the phase adjusting gear 36 in this way, the eccentric weight 51 attached to the first and second rotating shafts 21 and 22.
B and 51A and the 3rd and 4th eccentric weights 52A and 52B connected to the 3rd and 4th rotating shafts 23 and 24, a phase difference arises, and thereby each rotating shaft 21-24. The vibrating force or the amplitude applied to the casing member 20 via the is changed, and the same effect as that of the above-described embodiment can be obtained.

[0046]

As is apparent from the above description, according to the vibration generator of the present invention, the phase adjustment shaft is forcibly moved in the axial direction or relative to the first adjustment shaft. By forcibly moving the second adjustment shaft in the axial direction or by supplying / discharging the fluid to / from the fluid working chamber, the phase adjustment gear rotates relative to the phase adjustment shaft, and the phase adjustment gear is adjusted. The first and second rotary shafts, to which the rotation of one of the phase adjustment gear and the fixed phase gear is transmitted, because they rotate together with the phase adjustment shaft in the state where a phase difference occurs between the gear and the phase fixed gear. Between the eccentric weights attached to the eccentric weights and the eccentric weights coupled to the third and fourth rotation shafts to which the rotations of the other of them are transmitted. The horizontal component forces that occur are always offset On the other hand, the total value of the vertical component force generated in each eccentric weight is changed according to the phase difference between the eccentric weights, and as a result, the vibration force applied to the casing member via each rotary shaft changes. As a result, the vibrating force can be changed arbitrarily and steplessly even during operation, and the advantage that the structure is extremely simple, rational, and easy to manufacture can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a first embodiment of a vibration generator according to the present invention.

FIG. 2 is a development view of the first embodiment.

FIG. 3 is a front view showing an example of a vibrating pile driver to which the vibration generating device according to the present invention is applied.

FIG. 4 is a diagram provided for explaining an operation of the first embodiment.

FIG. 5 is a diagram for explaining the operation of the first embodiment.

FIG. 6 is a development view of an example in which the intermediate gear of the first embodiment is unnecessary.

FIG. 7 is a development view of a second embodiment of the vibration generator according to the present invention.

FIG. 8 is a perspective view of a main part of the second embodiment.

FIG. 9 is a cross-sectional view provided for explaining a modified example of the second embodiment.

FIG. 10 is a perspective view provided for explaining a modified example of the second embodiment.

FIG. 11 is a partially cutaway front view of the main part of the third embodiment.

FIG. 12 is a perspective view of a main part of the third embodiment.

FIG. 13 is a diagram which is used for describing an operation of the third embodiment.

[Explanation of symbols]

10-Vibration generator 51A, 52A-Eccentric weight 14-Motor 51B, 52B-Eccentric weight 20-Casing member 60-Position detector 21-First rotating shaft 70-Phase adjusting shaft 22-Second rotating shaft 71-First Adjusting Shaft 23-Third Rotating Shaft 72-Second Adjusting Shaft 24-Fourth Rotating Shaft 73,74,75,7
6-spiral uneven portion 25-phase adjusting shaft 90-phase adjusting shaft 31-34-transmission gear 91,92-hydraulic passage 35-phase adjusting gear 95-fixed partition wall 36-fixed phase gear 96-movable partition wall 46, 53-spiral uneven portion 100-hydraulic working chamber 50-cylinder 101-first working chamber 102-second working chamber

Claims (14)

[Claims] 1. A first rotary shaft, a second rotary shaft, a third rotary shaft, and a third rotary shaft, which are axially supported in parallel with each other in a casing member and to which an eccentric weight and a transmission gear are externally fitted and fixed, respectively. Four
Of the rotating shafts of the phase-fixed gears and the phase-adjustment gears that cannot rotate relative to each other and the phase-adjustment gears can rotate relative to each other. An adjusting shaft, and the transmission gears on the first rotating shaft and the second rotating shaft are meshed with each other, and
In the state where the transmission gears on the third rotating shaft and the fourth rotating shaft are meshed with each other and axial movement is blocked by either the third rotating shaft or the fourth rotating shaft, the phase The rotation of one of the fixed gear and the phase adjustment gear is changed to the first
And a transmission gear on the second rotation shaft is rotatably fitted on the intermediate gear, and further, any one of the transmission gears on the third rotation shaft and the fourth rotation shaft. Is meshed with the other of the phase fixing gear and the phase adjusting gear, and is provided with phase changing means for rotating the phase adjusting gear relative to the phase adjusting shaft in relation to the phase adjusting shaft. Vibration generator. 2. A first rotary shaft, a second rotary shaft, a third rotary shaft, and a third rotary shaft, which are axially supported in parallel with each other by a casing member and to which an eccentric weight and a transmission gear are externally fitted and fixed, respectively. Four
Of the rotating shafts of the phase-fixed gears and the phase-adjustment gears that cannot rotate relative to each other and the phase-adjustment gears can rotate relative to each other. An adjusting shaft, and the transmission gears on the first rotating shaft and the second rotating shaft are meshed with each other, and
One of them is meshed with one of the phase fixing gear and the phase adjusting gear, and the transmission gears on the third rotating shaft and the fourth rotating shaft are meshed with each other, and one of them is Vibrations that are meshed with the other of the phase fixing gear and the phase adjusting gear and that are provided with phase changing means for rotating the phase adjusting gear relative to the phase adjusting shaft in relation to the phase adjusting shaft. Generator. 3. A phase changing means, a motion converting means for converting a linear movement of the phase adjusting shaft in the axial direction into a rotational movement of the phase adjusting gear, and a driving means for forcibly moving the phase adjusting shaft in the axial direction. 3. The vibration generator according to claim 1, wherein the vibration generator is composed of: 4. The phase changing means is provided on a spiral concave-convex portion provided on an outer peripheral portion of the phase adjusting shaft and on an inner peripheral portion of the phase adjusting gear, and slidably fitted to the spiral concave-convex portion. The vibration generating device according to claim 1 or 2, comprising a spiral concave-convex portion and drive means for forcibly moving the phase adjustment shaft in the axial direction. 5. The phase changing means is provided in a spiral groove or ridge provided on an outer peripheral portion of the phase adjusting shaft and on an inner peripheral portion of the phase adjusting gear, and slides on the spiral groove or ridge. 3. The vibration generator according to claim 1, comprising a convex portion or a concave portion that is movably fitted and a driving unit that forcibly moves the phase adjustment shaft in the axial direction. .. 6. The phase changing means is provided with a pin erected on the phase adjusting shaft so as to project in the radial direction and a spiral elongated hole continuous with the phase adjusting gear and into which the pin is fitted. The vibration generator according to claim 1 or 2, further comprising: an extended boss portion; and a drive unit for forcibly moving the phase adjustment shaft in the axial direction. 7. The phase adjusting shaft comprises a first adjusting shaft and a second adjusting shaft, and the first adjusting shaft converts the linear motion into a rotary motion with respect to the second adjusting shaft. Drive means arranged so as to be relatively movable and relatively rotatable in the axial direction via the motion converting means, and the phase changing means forcibly moving at least one of the first adjusting shaft and the second adjusting shaft in the axial direction. The vibration generator according to claim 1 or 2, which is configured to include the vibration generator. 8. The phase adjusting shaft comprises a first adjusting shaft and a second adjusting shaft, and the first adjusting shaft is arranged so as to be relatively movable and relatively rotatable in the axial direction with respect to the second adjusting shaft. And the phase adjustment gear converts linear motion into rotary motion.
Is externally fitted to one of the first adjusting shaft and the second adjusting shaft so as to be relatively rotatable through the motion converting means of
3. The phase changing means includes a driving means for forcibly moving at least one of the first adjusting shaft and the second adjusting shaft in the axial direction.
The vibration generator described in 1. 9. The phase adjusting shaft comprises a first adjusting shaft and a second adjusting shaft, and the first adjusting shaft converts a linear motion into a rotary motion with respect to the second adjusting shaft. The phase adjusting gear is arranged so as to be relatively movable and relatively rotatable in the axial direction via the motion converting means, and the phase adjusting gear converts the linear motion into the rotary motion via the second motion converting means. A drive unit that is fitted onto one of the two adjustment shafts so as to be relatively rotatable, and that the phase changing unit forcibly moves at least one of the first adjustment shaft and the second adjustment shaft in the axial direction. The vibration generator according to claim 1 or 2, which is configured to include the vibration generator. 10. A first motion converting means is engraved on the inner periphery of the first adjustment shaft and on the outer periphery of the second spiral shaft and on the outer periphery of the second adjustment shaft. 10. The vibration generating device according to claim 7, wherein the vibration generating device is configured with a second spiral concavo-convex portion fitted to the spiral concavo-convex portion. 11. The second motion converting means includes a third spiral concave-convex portion engraved on one inner peripheral portion of the phase adjusting gear, a first adjusting shaft on which the phase adjusting gear is fitted, and 10. A fourth spiral concavo-convex portion which is engraved on the outer circumference of one of the second adjusting shafts and fits into the third spiral concavo-convex portion. The vibration generator described. 12. A vibration generator according to claim 9, wherein the rotation conversion directions of the first motion conversion means and the second motion conversion means are the same. 13. The phase changing means has a fluid working chamber formed between the outer peripheral portion of the phase adjusting shaft and the phase adjusting gear,
The vibration generator according to claim 1 or 2, wherein the phase adjusting gear is configured to rotate relative to the phase adjusting shaft by supplying / discharging a fluid to / from the fluid working chamber. 14. The vibration generation according to claim 13, wherein the fluid working chamber is partitioned by a fixed partition wall portion fixed to the phase adjusting shaft and a movable partition wall portion fixed to the phase adjusting gear. apparatus.