JP7549988B2 - Side handle and work machine - Google Patents

Description

This disclosure relates to a side handle that is attached to a work machine that generates vibrations when used by a user, and to a work machine equipped with the side handle.

A hammer drill is known as a machine used to process workpieces. The output shaft, to which the tool tip is attached, is moved back and forth in the axial direction, striking the workpiece, such as concrete, with the tool tip, thereby chipping the workpiece.

This type of work machine is equipped with an impact mechanism that reciprocates the tool tip, and since the work machine body vibrates significantly in the axial direction of the output shaft, a side handle is attached to the work machine body for the operator to grasp.

Meanwhile, Patent Document 1 discloses that a switch that can be operated by a user is provided on a side handle of a work machine, and the operation of the work machine is controlled according to the operating state of the switch.
Therefore, even in a work machine such as the above-mentioned hammer drill, which generates vibrations when used by a user, it is conceivable to incorporate various electronic components such as operation switches in the side handle.

WO2017/051892

In the work machine disclosed in Patent Document 1, a power source for detection is supplied from the work machine to the side handle via a coaxial connector so that the operating state of the switch provided on the side handle can be detected on the work machine side.

This is because a coaxial connector is provided at the mounting part where the fixed shaft of the side handle is screwed into the fixing hole in the work machine body, so that the side handle can be fixed to the work machine body and a power supply path to the side handle can be secured at the same time.

However, supplying power from the work machine body to the side handle in this way requires a complex configuration, which increases costs.
Furthermore, in work machines that generate vibrations when used by a user, the part where the side handle is attached to the work machine body also vibrates, which can make the power supply path more susceptible to poor contact or broken wires, reducing the reliability of the work machine.

On the other hand, to prevent this problem, it is possible to install a secondary battery inside the side handle, supply power from this secondary battery to an electrical circuit inside the side handle, and transmit a detection signal from the electrical circuit to the work machine body via wireless communication.

However, to achieve this, the side handle needs to be designed to allow the secondary battery to be replaced and ensure that the area housing the secondary battery is waterproof, which increases the cost of the side handle.

In addition, in working machines that generate vibrations when used by a user, the part of the side handle that houses the secondary battery also vibrates, and this vibration may reduce the waterproofing.

One aspect of the present disclosure is that, in a work machine that generates vibrations when used by a user, it is desirable for the electrical circuit in the side handle to be operable without supplying power from the work machine to the side handle or providing a secondary battery in the side handle.

A side handle according to one aspect of the present disclosure is a side handle that is attached to a work machine that generates vibrations when used by a user.
The side handle is provided with a vibration power generation element configured to generate power from vibrations of the work machine and a power supply circuit configured to generate a power supply voltage from the output of the vibration power generation element. The power supply voltage generated by the power supply circuit is supplied to an electric circuit in the side handle.

Therefore, according to the side handle of the present disclosure, the electrical circuit provided in the side handle can be operated by the power generated by the vibration power generation element, and there is no need to provide a power supply path to supply power from the work machine to the side handle or to provide a secondary battery.

Therefore, the side handle disclosed herein can be realized at a lower cost than when such a power supply path or secondary battery is provided, and since the power supply path or the storage area for the secondary battery will not be damaged by vibration, the reliability of the work machine can be improved.

Here, the side handle may be attached to the work machine so that the main vibration direction of the work machine coincides with the vibration direction in which the vibration power generation element generates maximum power.
In this way, the vibration power generating element can efficiently convert the vibration of the work machine into electricity and supply it to the power supply circuit, so there is no need to use a vibration power generating element with a large power generation capacity in order to ensure the operating power of the electric circuit, and costs can be reduced.

In this case, the side handle is attached to the work machine via an annular fixing part that can be tightened around the body of the work machine, and the inner surface of the ring of the fixing part may be provided with a protrusion that abuts against the outer surface of the work machine to prevent the fixing part from rotating around the central axis of the ring.

By configuring the fixing part of the side handle in this way, it becomes possible to arbitrarily set the direction in which the side handle protrudes from the work machine before the annular fixing part is tightened and fixed around the main body of the work machine.

In addition, by tightening the fixing parts around the main body of the work machine, the protrusions on the inner surface between the fixing parts come into contact with the outer surface of the work machine, and the side handle is positioned and fixed to the work machine.

Therefore, the operator can adjust the direction in which the side handle protrudes from the work machine to a direction that makes it easier for the operator to grip the side handle and perform work.
Next, the side handle may be provided with at least two vibration power generation elements.

In this case, at least two vibration power generation elements may be arranged so that the vibration directions that generate maximum power are perpendicular to each other, so that the vibration in the main vibration direction of the work machine is divided into vibrations in two perpendicular directions to generate power.

By arranging two vibration power generation elements in this way, it becomes possible to generate approximately the same amount of power as when one vibration power generation element is fixed to the side handle so that the vibration direction coincides with the main vibration direction of the work machine.

To achieve this, at least two vibration power generation elements should each be connected to a rectifier circuit that rectifies the AC power generated by the vibrations and converts it into DC power, and the rectifier circuits should be connected in series with each other so that the converted DC power can be added and output to the power supply circuit.

In this case, even if the attachment angle of the side handle with respect to the work machine around the central axis changes, the desired generated power can be obtained by the vibration of the work machine.
Therefore, when the side handle is attached to the work machine via a ring-shaped fixing part that can tighten around the main body of the work machine, the tightening operation around the main body of the work machine using the fixing part can be performed by rotating the side handle around the central axis.

In this case, the fixing part may be composed of a tightening band, a connecting part that connects both ends of the tightening band, a threaded part that extends from the connecting part to the opposite side of the tightening band, a nut part that screws into the threaded part, and a receiving part that is provided between the work machine and the side handle.

Then, the threaded portion is inserted into the side handle in the direction of the central axis, the nut portion is fixed inside the side handle, and the receiving portion is placed between the work machine and the side handle so that it surrounds the threaded portion and the connecting portion and abuts against the periphery of the main body of the work machine that is fastened by the fastening band.

By configuring the fixing part in this way, the nut part screwed onto the threaded part can be rotated by rotating the side handle around the central axis. Then, depending on the direction of rotation of the side handle, the connecting part to which the threaded part extends can be moved in the direction in which the tightening band tightens around the main body of the work machine, or in the direction in which the tightening band is loosened.

Therefore, by rotating the side handle, the side handle can be firmly fixed to the work machine via the fixing part, and by loosening the fastening band, the direction in which the side handle protrudes from the work machine can be adjusted as desired.

Next, it is preferable that the electrical circuit in the side handle has a wireless communication function. In this way, not only can power be supplied to the electrical circuit, but also information obtained within the side handle can be transmitted to the work machine body or a nearby communication terminal without using a signal line.

The side handle may be provided with an acceleration sensor that detects acceleration in the vibration direction of the work machine, or may be provided with a switch that can be operated by the operator.
Furthermore, if the side handle is equipped with an acceleration sensor, the electrical circuit may be configured to transmit the acceleration detected by the acceleration sensor to the work machine body or a nearby communication terminal via wireless communication function.

When the electrical circuit is configured in this way, the amount of vibration (i.e., exposure) that a worker holding the side handle receives from the work machine can be stored on the work machine itself or in a nearby communication terminal.

In addition, if the side handle is equipped with a switch, the electrical circuit may be configured to transmit the operating state of the switch to the control unit of the work machine body via wireless communication.

When the electrical circuit is configured in this manner, the operation state of the switch is transmitted to the control unit of the work machine body, allowing the control unit of the work machine body to switch control of the work machine according to the operation state of the switch.

Next, a work machine according to another aspect of the present disclosure is a work machine that generates vibrations when used by a user, and includes a main body housing and a side handle that protrudes from the main body housing and can be gripped by the user.

The side handle is configured as the side handle of the present disclosure described above. Therefore, the working machine of the present disclosure can also achieve the same effects as those described above.
The main housing may include an output shaft to which the tool bit is attached, and an impact mechanism that strikes the workpiece with the tool bit by reciprocating the output shaft in the axial direction.

In a work machine with a main body housing configured in this way, the main body housing vibrates when struck by the striking mechanism, and the vibration causes the vibration power generation element in the side handle to generate electricity, achieving the same effect as above.

1 is a perspective view showing an overall configuration of a hammer drill according to a first embodiment; FIG. 2 is a schematic diagram showing a configuration of a fixing portion between the hammer drill and the side handle. 10 is an explanatory diagram illustrating the arrangement of the vibration power generation element in the side handle. FIG. FIG. 4 is a block diagram showing a circuit configuration within the side handle. FIG. 11 is a block diagram showing a modified example of the circuit configuration in the side handle. 13 is an explanatory diagram showing the appearance of a fixing portion of a side handle of a second embodiment. FIG. 4 is an explanatory diagram showing the configuration of a fixing part and the arrangement of two vibration power generating elements in a side handle. FIG. 4 is a circuit diagram showing a configuration of a power supply path from two vibration power generating elements to a power supply circuit. FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[First embodiment]
The hammer drill 2 of this embodiment is used to perform chipping and drilling operations on a workpiece (e.g., concrete) by striking a tip tool such as a hammer bit in the longitudinal direction and rotating it around the longitudinal axis.

As shown in FIG. 1, the hammer drill 2 is mainly composed of a main body housing 10 that forms the outer shell of the hammer drill 2. A tip tool 4 (see FIG. 2) is removably attached to the tip region of the main body housing 10 via a cylindrical tool holder 6 that serves as an output shaft.

The tool tip 4 is inserted into the bit insertion hole of the tool holder 6 and is held in a state in which it can move back and forth relative to the tool holder 6 in the axial direction, but its relative rotation in the circumferential direction around the axial direction is restricted.

The main body housing 10 is mainly composed of a motor housing 12 that houses a motor, and a gear housing 14. The gear housing 14 is provided with a motion conversion mechanism, a striking element 30 (see FIG. 2) that serves as a striking mechanism, a rotation transmission mechanism, a mode switching mechanism, etc.

A hand grip 16 is connected to the main housing 10 on the side opposite the tool holder 6 to which the tool tip 4 is attached. The hand grip 16 is formed with a gripping portion 16A that is held by the operator. This gripping portion 16A is elongated in a direction (the up-down direction in FIG. 1) that intersects with the long axis of the tool tip 4 (in other words, the central axis of the tool holder 6), and a part of the gripping portion 16A is located on the extension line (long axis line) of the long axis of the tool tip.

In the hand grip 16, one end of the gripping portion 16A (the side closest to the longitudinal axis of the tool tip 4) is connected to the gear housing 14, and the other end of the gripping portion 16A (the side away from the longitudinal axis of the tool tip 4) is connected to the motor housing 12.

For the sake of convenience, in the following explanation, the tool 4 side is referred to as the front and the hand grip 16 side as the rear in the longitudinal direction of the tool 4. Also, in the direction perpendicular to the longitudinal direction of the tool 4 and in which the grip 16A extends (the up-down direction), the side of the connection between the hand grip 16 and the gear housing 14 is referred to as the top, and the side of the connection between the hand grip 16 and the motor housing 12 is referred to as the bottom.

The long axis of the tool tip 4 attached to the tool holder 6 (in other words, the central axis of the tool holder 6 as the output axis) is the Z axis, the up-down direction perpendicular to the Z axis is the Y axis, and the left-right direction perpendicular to these axes (in other words, the width direction of the main housing 10) is the X axis (see Figure 2).

The gear housing 14 is disposed on the front side of the main body housing 10 in the longitudinal direction of the tool bit 4, and the motor housing 12 is disposed below the gear housing 14. A hand grip 16 is connected to the rear of the gear housing 14.

In the motor housing 12, the motor is positioned so that its rotation axis intersects with an axis (i.e., the Z-axis) that extends in the longitudinal direction of the tool tip 4, and the motor's rotation axis extends in the vertical direction of the hammer drill 2.

In addition, two battery packs 22, 24 that serve as power sources for the hammer drill 2 are provided behind the motor storage area in the motor housing 12. These two battery packs 22, 24 are detachably attached to a battery attachment section 20 provided below the motor housing 12.

A motor control unit is provided above the battery attachment section 20 (in other words, below the hand grip 16) to receive power from the battery packs 22, 24 and drive and control the motor.

The rotation of the motor's rotating shaft is converted to linear motion by the motion conversion mechanism and then transmitted to the impact element 30, which generates an impact force in the direction of the long axis (Z-axis) of the tool tip 4. The rotation of the motor's rotating shaft is also decelerated by the rotation transmission mechanism and then transmitted to the tool tip 4, which is then driven to rotate around the long axis (Z-axis). The motor is driven based on the pulling operation of the trigger 18 located on the hand grip 16.

The hammer drill 2 of this embodiment has, as drive modes, a hammer mode, a hammer drill mode, and a drill mode.
In the hammer mode, the tool tip 4 performs a striking motion in the Z-axis direction, and striking work is performed on the workpiece. In the hammer drill mode, the tool tip 4 performs a striking motion in the Z-axis direction and a rotating motion about the Z-axis. In this way, hammer drilling work is performed on the workpiece. In the drill mode, the tool tip 4 does not perform a striking motion, but only a rotating motion about the Z-axis. In this way, drilling work is performed on the workpiece. This drive mode is switched by a mode switching mechanism.

The configurations of the motion conversion mechanism, striking element 30, rotation transmission mechanism, etc. are described in, for example, JP 2018-58190 A and are publicly known technologies, so detailed explanations will be omitted here.

In the hammer mode and hammer drill mode, the striking element 30 in the gear housing 14 causes the tip tool 4 fixed to the tool holder 6 to reciprocate in the Z-axis direction to strike the workpiece, causing the hammer drill 2 to vibrate with the Z-axis direction as the main vibration direction.

In addition, in the hammer drill mode and drill mode, the tip tool 4 fixed to the tool holder 6 rotates around the Z axis, so when the tip tool 4 bites into the workpiece, the hammer drill 2 may be swung around in the opposite direction to the rotation direction of the tip tool 4.

For this reason, a side handle 50 is attached via an annular fixing part 40 to the outer periphery of the tip region of the gear housing 14 from which the bit 4 protrudes.
The side handle 50 is intended to be held by the user, similar to the hand grip 16. Therefore, the user can firmly hold the hammer drill 2 by holding the grip portion 16A of the hand grip 16 and the grip portion 50A of the side handle 50 with the left and right hands.

As shown in FIG. 2, the fixing part 40 is annular with a portion of the ring open. The open end portions are bent outward from the ring, with a nut 44 embedded in one bent portion 41 and a screw 46 that can be screwed into the nut 44 being inserted into the other bent portion 42. The screw 46 is wide on the side opposite the nut 44 so that the user can tighten it with their fingers when screwed into the nut 44.

The inner peripheral surface of the ring of the fixing part 40 is provided with a plurality of protrusions 48 spaced at predetermined intervals in the circumferential direction. These protrusions 48 are configured to be able to fit into a plurality of recesses 15A spaced at predetermined intervals in the circumferential direction in the barrel part 15 that constitutes the outer peripheral surface for mounting the side handle in the gear housing 14.

The fixing part 40 can therefore be fixed to the gear housing 14 by rotating it around the barrel part 15 around the Z axis, fitting each of the convex parts 48 into each of the concave parts 15A of the barrel part 15 at the desired rotational position, and then tightening the screw 46 into the nut 44. In this fixed state, the fixing part 40 is fixed to the hammer drill 2 so that it cannot rotate around the Z axis.

The side handle 50 is fixed to the tip of the bent portion 42 of the fixing portion 40 through which the screw 46 is inserted. Therefore, before fixing the side handle 50 to the gear housing 14, the ring of the fixing portion 40 can be expanded to allow the protruding direction of the side handle 50 from the hammer drill 2 to be set as desired around the Z axis.

In other words, the direction in which the side handle 50 protrudes from the hammer drill 2 can be set arbitrarily from the downward direction shown in FIG. 1 to the left or right, or upward, so that the user can easily grip it.

Next, the side handle 50 is provided with a circuit board 54 on which a vibration power generation element 52 is mounted, as shown in FIG.
The vibration power generation element 52 is a device configured to generate power through vibration, for example, using a piezoelectric element, and the vibration power generation element 52 is fixed within the side handle 50 via the circuit board 54 so that the vibration direction that generates maximum power is the Z-axis direction.

Therefore, the vibration direction of the vibration power generation element 52 coincides with the main vibration direction of the hammer drill 2 caused by the impact element 30 as the impact mechanism, and when the hammer drill 2 is driven in the hammer mode and hammer drill mode, the vibration power generation element 52 vibrates in the same direction as the hammer drill 2. The vibration power generation element 52 generates electricity from this vibration and outputs AC power according to the vibration period.

As shown in FIG. 4 , the circuit board 54 on which the vibration power generating element 52 is mounted also has a power storage element 56 , a power supply circuit 58 , an acceleration sensor 60 , and a wireless communication circuit 62 provided thereon.
Here, the power storage element 56 rectifies the AC power output from the vibration power generation element 52 to charge the capacitor, thereby storing DC power in the capacitor. The power supply circuit 58 generates a power supply voltage (constant DC voltage) for driving the acceleration sensor and the wireless communication circuit 62 from the DC power stored in the power storage element 56, and supplies this voltage to each of these components.

The acceleration sensor 60 is fixed to the circuit board 54 and detects acceleration. The wireless communication circuit 62 wirelessly transmits the acceleration detected by the acceleration sensor 60 to a preset destination via the antenna 64, and stores the acquired acceleration information at the destination.

The destination of the transmission from the wireless communication circuit 62 can be set to a nearby communication terminal 70 such as a smartphone, or a wireless communication circuit 72 provided in the motor control unit 26 of the hammer drill 2, etc.

For example, when the wireless communication circuit 72 provided in the motor control unit 26 receives a transmission signal from the side handle 50 via the antenna 74, it outputs the received signal to the MCU 76 in the motor control unit 26.

The MCU 76 then calculates the amount of vibration exposure at the side handle 50 from the received signal and stores it in memory 77. As a result, the amount of vibration exposure by the user holding the side handle 50 is accumulated in memory 77, and a manager can protect workers from vibration disorders by checking the amount of exposure stored in memory 77.

In addition, if a communication terminal 70 such as a smartphone is set as the destination of the wireless communication circuit 62, the communication terminal 70 or the host server of the communication terminal 70 can monitor the worker's vibration exposure and take safety measures.

As described above, the side handle 50 of this embodiment is provided with a vibration power generation element 52 that generates power from the vibration of the hammer drill 2, and a power supply circuit 58 that generates a power supply voltage from the output from the vibration power generation element 52. The acceleration sensor 60 and wireless communication circuit 62, which are electrical circuits provided in the side handle 50, operate by receiving the power supply voltage generated by the power supply circuit 58.

Therefore, there is no need to provide a power line for supplying power from the main body of the hammer drill 2 to the side handle 50 or a secondary battery in order to operate the acceleration sensor 60 or the wireless communication circuit 62. This prevents the power line from being disconnected or the secondary battery storage section from breaking due to vibrations of the hammer drill 2, improving the reliability of the hammer drill 2.

The side handle 50 is attached to the hammer drill 2 via an annular fixing part 40 that can be tightened around the barrel part 15 of the gear housing 14 using a screw 46. Therefore, although the direction in which the side handle 50 protrudes from the hammer drill 2 can be changed, the side handle 50 cannot rotate around its central axis, and the vibration direction in which the vibration power generation element 52 generates maximum power does not change due to the rotation of the side handle 50.

The vibration power generating element 52 is provided inside the side handle 50 so that the vibration direction in which it generates maximum power coincides with the main vibration direction of the hammer drill 2 caused by the striking element 30, so that the vibration of the hammer drill 2 can be efficiently converted into electric power. Therefore, there is no need to use a vibration power generating element 52 with a large power generation capacity in order to ensure the operating power of the acceleration sensor 60 and the wireless communication circuit 62, thereby reducing costs.
[Modification]
In the above embodiment, the side handle 50 is described as being provided with the acceleration sensor 60 and the wireless communication circuit 62 as electric circuits that operate by receiving power from the power supply circuit 58 .

In contrast, as shown in FIG. 5, the side handle 50 may be provided with an electric circuit including a switch 68 that can be operated by the operator and a wireless communication circuit 62. In this case, the wireless communication circuit 62 may transmit the operating state of the switch 68 to the motor control unit 26 of the hammer drill 2.

That is, in the motor control unit 26, the MCU 76 is configured to drive the motor (brushless motor) 13 in the motor housing 12, for example, via a gate drive circuit 78 and an inverter 79. In this case, if the operation state of the switch is transmitted from the wireless communication circuit 62 to the wireless communication circuit 72 of the motor control unit 26, the MCU 76 can control the drive of the motor 13 according to the operation state of the switch 68.

In addition, in the above embodiment, the vibration power generation element 52 is described as being one, but multiple vibration power generation elements 52 may be provided to ensure the operating power of the electrical circuitry within the side handle 50.

In this case, the plurality of vibration power generating elements 52 are arranged so that the vibration direction in which the maximum power is generated coincides with the main vibration direction of the hammer drill 2. The output from each vibration power generating element 52 is stored in the power storage element 56, and the stored power is combined and input to the power supply circuit 58.
[Second embodiment]
Next, a second embodiment of the present disclosure will be described.

The side handle 50 of this embodiment is attached to the hammer drill 2 for use, similar to the first embodiment, but differs from the first embodiment in the configuration of the fixing part 80 for fixing to the barrel part 15 of the hammer drill 2, and in the number and arrangement of the vibration power generation elements 52.

As shown in FIG. 6, the fixing portion 80 of this embodiment includes a tightening band 82 that is wrapped around the barrel portion 15 of the hammer drill 2 to tighten the barrel portion 15, and a receiving portion 84 that is provided between the barrel portion 15 and the side handle 50.

The receiving portion 84 is brought into contact with the barrel portion 15 when the tightening band 82 is tightened to the barrel portion 15, thereby fixing the side handle 50 to the hammer drill 2. The surface that comes into contact with the outer peripheral surface of the barrel portion 15 has multiple protrusions 85.

This protrusion 85, like the protrusion 48 provided on the fixing part 40 in the first embodiment, fits into the recess 15A provided on the barrel part 15 to determine the protruding direction of the side handle 50 from the hammer drill 2.

In FIG. 6, the drawing on the left side is a side view of the side handle 50 attached to the hammer drill 2, viewed from a direction perpendicular to the Z axis, and the drawing on the right side is a front view of the side handle 50, viewed from the Z axis direction.

Next, as shown in FIG. 7, the receiving portion 84 is hollow and has openings at both circumferential ends of the surface that abuts against the outer circumferential surface of the barrel portion 15. From the openings at both ends, both ends of the tightening band 82 wrapped around the barrel portion 15 are pulled into the hollow internal space.

In addition, in the internal space of the receiving portion 84, both ends of the tightening band 82 are connected by a connecting portion 86. The connecting portion 86 is provided with a screw portion 88 that extends to the opposite side of the tightening band 82 (i.e., the side handle 50 side).

The screw portion 88 is rod-shaped and has a screw thread formed around its periphery. The screw portion 88 passes through insertion holes provided in the receiving portion 84 and the side handle 50, and is inserted into the internal space of the side handle 50 in the direction of the central axis P of the side handle 50.

Meanwhile, a nut portion 90 that can be screwed onto the inserted threaded portion 88 is integrally provided in the internal space of the side handle 50 .
Therefore, according to the fixing portion 80 of this embodiment, by rotating the side handle 50 about its central axis P relative to the receiving portion 84, the nut portion 90 can be moved in the direction of the central axis of the screw portion 88.

Then, as the nut portion 90 moves, both ends of the tightening band 82 are pulled toward the side handle 50, and the tightening band 82 is tightened around the barrel portion 15, or the tightening band 82 loosens its grip on the barrel portion 15.

For this reason, the side handle 50 of this embodiment can be fixed to the hammer drill 2 by rotating it around the central axis P. Also, by rotating the side handle 50 in the opposite direction to when it was tightened, the tightening by the tightening band 82 can be loosened and the protruding direction of the side handle 50 from the hammer drill 2 can be adjusted.

When the fixing portion 80 is configured as described above, the rotation angle of the side handle 50 about the central axis P when the side handle 50 is fixed to the hammer drill 2 changes with respect to the Z axis, which is the main vibration direction of the hammer drill 2, as shown on the right side of Figure 7.

For this reason, in the side handle 50 of this embodiment, unlike the first embodiment, the vibration direction of the vibration power generation element 52 provided inside the grip portion 50A cannot be aligned with the main vibration direction of the hammer drill 2.

In this embodiment, two vibration power generation elements 52A, 52B are provided in the grip portion 50A of the side handle 50. The two vibration power generation elements 52A, 52B are arranged so that the vibration directions that generate maximum power are perpendicular to each other around the central axis P of the side handle 50.

As a result, the vibration power generation elements 52A, 52B can generate power by dividing the vibration in the main vibration direction of the hammer drill 2 into vibrations in two perpendicular directions. Therefore, for example, if the vibration power generation elements 52A, 52B have the same specifications as the vibration power generation element 52 of the first embodiment, the total power output from the two vibration power generation elements 52A, 52B due to the vibration of the hammer drill 2 will be approximately the same as the output from the vibration power generation element 52 of the first embodiment.

Therefore, in this embodiment of the side handle 50, even if the rotation angle around the central axis P when fixed to the hammer drill 2 changes, the power required to operate the electrical circuit within the side handle 50 can be obtained stably.

In order to obtain such stable power, the power supply paths from the two vibration power generating elements 52A and 52B to the power supply circuit 58 are configured as shown in FIG.
8, the outputs from the vibration power generating elements 52A, 52B are full-wave rectified by full-wave rectifier circuits 53A, 53B each composed of four diodes. The full-wave rectified DC power is then output to capacitors 56A, 56B each constituting a power storage element, and each of the capacitors 56A, 56B is charged.

Further, the full-wave rectifier circuits 53A, 53B and the capacitors 56A, 56B are connected in series to each other so that the DC powers can be added together and output to the power supply circuit.
In other words, the negative terminals of the full-wave rectifier circuit 53A and the capacitor 56A are connected to the positive terminals of the full-wave rectifier circuit 53B and the capacitor 56B, and the power supply circuit 58 is supplied with a DC voltage between the positive terminal of the capacitor 56A and the negative terminal of the capacitor 56B.

As a result, the power supply circuit 58 is supplied with power that is a combination of the power generated by each vibration power generation element 52A, 52B, and the power supply circuit 58 is able to generate a power supply voltage in response to the vibration of the hammer drill 2.
[Other embodiments]
Although the embodiments for carrying out the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be carried out in various modified forms.

For example, in the above embodiment, a hammer drill 2 whose drive mode can be switched between hammer mode, hammer drill mode, and drill mode has been described as an example of a work machine. However, the present disclosure can be applied to any work machine that generates vibrations when used by a user.

In other words, the side handle of the present disclosure can be applied in the same manner as in the above embodiment even to a work machine that does not have the function of rotating the output shaft and has only a striking mechanism such as the striking element 30. It can also be applied in the same manner as in the above embodiment to a work machine that has an engine as a power source, a work machine that vibrates by piston movement such as an air nailer, or a work machine that reciprocates a cutting or polishing tool tip with a reciprocating mechanism.

Furthermore, multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Further, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Further, part of the configuration of the above embodiments may be omitted. Further, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

2... hammer drill, 30... striking element, 50... side handle, 52... vibration power generation element, 58... power supply circuit, 60... acceleration sensor, 62... wireless communication circuit, 68... switch.

Claims (8)

A side handle attached to a work machine that generates vibrations when used by a user,
a vibration power generation element configured to generate power by vibration of the work machine;
a power supply circuit configured to generate a power supply voltage from an output from the vibration power generation element;
an electric circuit configured to operate by receiving a power supply voltage generated by the power supply circuit;
With
At least two of the vibration power generation elements are provided,
the at least two vibration power generation elements are arranged so that the vibration directions in which they generate maximum power are perpendicular to each other, and are configured to generate power by dividing a vibration in a main vibration direction of the work machine into vibrations in the two perpendicular directions,
the at least two vibration power generating elements are each connected to a rectifier circuit that rectifies AC power generated by vibration and converts it into DC power;
A side handle of a work machine , wherein the rectifier circuits are configured to be connected in series with each other so as to add up the converted DC powers and output the sum to the power supply circuit . A side handle attached to a work machine that generates vibrations when used by a user,
a vibration power generation element configured to generate power by vibration of the work machine;
a power supply circuit configured to generate a power supply voltage from an output from the vibration power generation element;
an electric circuit configured to operate by receiving a power supply voltage generated by the power supply circuit;
an acceleration sensor for detecting acceleration in a vibration direction of the work machine;
Equipped with
A side handle of a work machine, wherein the electrical circuit has a wireless communication function and is configured to transmit the acceleration detected by the acceleration sensor to the work machine body or a communication terminal in the vicinity via the wireless communication function. A side handle attached to a work machine that generates vibrations when used by a user,
a vibration power generation element configured to generate power by vibration of the work machine;
a power supply circuit configured to generate a power supply voltage from an output from the vibration power generation element;
an electric circuit configured to operate by receiving a power supply voltage generated by the power supply circuit;
A switch that can be operated by an operator;
Equipped with
A side handle of a work machine, wherein the electrical circuit has a wireless communication function and is configured to transmit the operation state of the switch to a control unit of the work machine body via the wireless communication function. The side handle is attached to the work machine via an annular fixing part that can be fastened around the main body of the work machine,
The side handle of a work machine according to any one of claims 1 to 3, wherein the fixing portion is configured to tighten around the main body of the work machine by rotating the side handle around the central axis of the side handle . The fixing portion is
A tightening band disposed around a main body of the working machine;
a connecting portion that connects both ends of the tightening band;
a threaded portion extending from the connecting portion to a side opposite to the fastening band and inserted into the side handle in a central axial direction of the side handle;
a nut portion fixed in the side handle and screwed onto the threaded portion;
a receiving portion provided between the work machine and the side handle so as to surround the screw portion and the connecting portion and to abut against the periphery of the main body of the work machine fastened by the fastening band;
The side handle of claim 4 , further comprising: 6. The side handle of a work machine according to claim 5 , wherein the tightening band is provided with a protrusion that abuts against an outer peripheral surface of the work machine to prevent the fixing portion from rotating around the main body of the work machine. A work machine that generates vibrations when used by a user,
A main body housing;
a side handle protruding from the main body housing and capable of being gripped by a user;
The work machine includes a side handle according to any one of claims 1 to 6 . The main body housing includes:
an output shaft to which a tool tip is attached;
an impact mechanism that impacts a workpiece with the tip tool by reciprocating the output shaft in an axial direction;
The work machine according to claim 7 , wherein the work machine vibrates when struck by the striking mechanism.