JP7464139B2 - Work Machine - Google Patents

Description

The present invention relates to a work machine having a housing that supports an actuating member, a handle connected to the housing and held by an operator, and a battery pack attached to the handle.

An example of a work machine having a housing that supports an actuating member, a handle connected to the housing and held by an operator, and a battery pack attached to the handle is described in Patent Document 1. The electric tool as a work machine described in Patent Document 1 has a housing that accommodates a motor, a handle connected to the housing and held by an operator, a motor, a control unit, and a cylinder provided in the housing, a piston and a striker as an actuating unit provided reciprocally within the cylinder, a holder that supports the cylinder and the intermediate striker and is rotatable within the housing, a tool tip supported by the holder, a power conversion mechanism that transmits the rotational force of the motor to the piston, and a rotation transmission mechanism that transmits the rotational force of the motor to the holder.

The handle is attached to the housing with a shaft as a pivot point. A battery pack is provided so as to be attachable to and detachable from the handle. The handle has a guide rail, and the battery pack has a guided portion. With the guide rail and the guided portion engaged, the battery pack is slid relative to the handle, and the battery pack is attached to and detached from the handle.

Furthermore, a trigger is provided on the handle, and when the operator operates the trigger, the control unit supplies power from the battery pack to the motor, causing the motor to rotate. The rotational force of the motor is transmitted to the piston by the power conversion mechanism, causing the piston to reciprocate within the cylinder. When the piston is operated, the air pressure in the cylinder increases, causing the striker to strike the intermediate striker. The striking force received by the intermediate striker is transmitted to the tip tool. In addition, the rotational force of the motor is transmitted to the holder by the rotation transmission mechanism, and the rotational force of the holder is transmitted to the tip tool. When the housing vibrates due to the operation of the piston and striker, the handle can rotate around the shaft as a fulcrum.

International Publication No. 2019/003742

The inventors of the present application recognized the problem that when vibrations of the housing are transmitted to the handle, the battery pack vibrates relative to the handle.

The object of the present invention is to provide a work machine capable of suppressing vibration of the battery pack relative to the handle.

One embodiment of the work machine has an operating member operated in the axial direction by a motor, a housing supporting the operating member, a handle connected to the housing so as to be rotatable around a pivot axis extending along a direction perpendicular to the axial direction and held by an operator, and a battery pack attached to the handle, wherein the pivot axis is located within the arrangement area of the battery pack when viewed in the axial direction of the pivot axis.

According to one embodiment of the work machine, it is possible to suppress vibration of the battery pack relative to the handle.

1 is a front sectional view of a hammer drill according to a first embodiment of the present invention; FIG. 2 is a front view of the hammer drill of FIG. 1 . 11 is a front view showing a process of attaching and detaching the battery pack to the hammer drill. FIG. 4 is a side cross-sectional view taken along line IV-IV in FIG. 1. FIG. 2 is a partial front cross-sectional view of the hammer drill of FIG. 1 . FIG. 5 is a partial front sectional view of a hammer drill according to a second embodiment of the present invention. FIG. 11 is a front cross-sectional view showing the handle of the hammer drill of the second embodiment, which is rotatable relative to the housing. FIG. 7 is a partial front cross-sectional view of the hammer drill of FIG. 6 .

Below, several embodiments included in the working machine of the present invention will be described in detail with reference to the drawings. In this embodiment, a hammer drill is disclosed as an example of a working machine. A hammer drill is an impact working machine that uses a tip tool to perform work such as drilling holes in an object, chipping an object, or crushing an object. The object includes concrete and stone.

(First embodiment) The hammer drill of the first embodiment is shown in Figures 1, 2, 3, 4 and 5. The hammer drill 10 comprises a housing 11, an electric motor 12, a power conversion mechanism 13, a rotational force transmission mechanism 14, an operating unit 15 and a handle 16. The housing 11 is assembled by fixing a cylinder case 17, a gear case 18 and a motor case 19 to each other. In addition, an operator holds the handle 16 in his/her hand, and the handle 16 is rotatable relative to the housing 11.

The cylinder case 17 is cylindrical. A cylindrical tool holder 20 is provided concentrically with the cylinder case 17. The tool holder 20 is provided on both the inside and outside of the cylinder case 17, and is rotatably supported by the cylinder case 17 via bearings 21. The tool holder 20 has a holding hole 22, and a tool tip 23 is inserted into the holding hole 22. In addition, an annular tapered surface 24 is provided on the inner surface of the holding hole 22.

The cylinder 25 is provided from within the cylinder case 17 to within the gear case 18, and the cylinder 25 and the tool holder 20 are provided concentrically. A portion of the cylinder 25 is located within the retaining hole 22. The cylinder 25 and the tool holder 20 are connected so as to be able to rotate together around the center line A1. In addition, a side handle 17A is attached to the outer surface of the cylinder case 17 to be gripped by the operator.

A metallic intermediate striker 26 is provided extending from the retaining hole 22 into the cylinder 25. The intermediate striker 26 is capable of operating in a direction along the center line A1 of the cylinder 25. The intermediate striker 26 has a large diameter portion 27. The outer diameter of the large diameter portion 27 is larger than the outer diameter of other portions of the intermediate striker 26. A striker 28 that strikes the intermediate striker 26 is provided within the cylinder 25. The striker 28 is capable of operating in a direction along the center line A1. Furthermore, an annular stopper 29 is provided within the tool holder 20. The stopper 29 does not move in a direction along the center line A1 relative to the tool holder 20.

A piston 30 is provided in the cylinder 25, and the piston 30 is operable in a direction along the center line A1. An air chamber 31 is provided in the cylinder 25 between the striker 28 and the piston 30. The piston 30, the striker 28 and the intermediate striker 26 form the operating section 15. In addition, a breathing hole and an anti-dry strike hole are provided which penetrate radially through the cylinder 25. The breathing hole and the anti-dry strike hole are passages which connect the inside of the cylinder 25 to the outside of the cylinder 25.

The gear case 18 is disposed between the handle 16 and the cylinder case 17 in a direction along the center line A1. The motor case 19 is fixed to the cylinder case 17 and the gear case 18. The motor case 19 is cylindrical, and the electric motor 12 is housed inside the motor case 19. The electric motor 12 is, for example, a brushless motor, and has a stator 32 and a rotor 33 disposed inside the stator 32. The rotor 33 is fixed to the output shaft 34. The output shaft 34 has a drive gear 35. The output shaft 34 is supported by a bearing 36 so as to be rotatable about the center line A2. The center line A2 is a virtual line indicating the center of rotation of the output shaft 34. FIG. 1 shows an example in which the center lines A1 and A2 intersect at a predetermined angle, for example, 90 degrees. When power is supplied to the electric motor 12, the output shaft 34 rotates, and when the power supply to the electric motor 12 is stopped, the output shaft 34 stops.

The power conversion mechanism 13 is provided in the housing 11. The power conversion mechanism 13 is a mechanism that converts the rotational force of the output shaft 34 of the electric motor 12 into the operating force of the piston 30. The power conversion mechanism 13 has a crankshaft 37, a driven gear 38, a crank pin 39, and a connecting rod 40. The crankshaft 37 is rotatably provided in the gear case 18. The center line A3, which is the center of rotation of the crankshaft 37, is parallel to the center line A2. The driven gear 38 is provided on the crankshaft 37, and the driven gear 38 and the drive gear 35 mesh with each other. The crank pin 39 is attached to the crankshaft 37. The crank pin 39 is provided at a position eccentric to the center line A3. The connecting rod 40 connects the crank pin 39 and the piston 30. When the rotational force of the output shaft 34 is transmitted to the crankshaft 37 via the driven gear 38, the piston 30 operates, that is, reciprocates, in the cylinder 25 in a direction along the center line A1.

The rotational force transmission mechanism 14 is provided within the housing 11. The rotational force transmission mechanism 14 is a mechanism that transmits the rotational force of the output shaft 34 to the cylinder 25 and the tool holder 20. The rotational force transmission mechanism 14 has a rotating shaft 41, a driven gear 42, bevel pinions 43, 44, and a clutch 45. The rotating shaft 41 is rotatable about a center line A4. The driven gear 42 and the bevel pinion 43 are provided on the rotating shaft 41, and the driven gear 42 meshes with the drive gear 35.

Furthermore, a cylindrical bevel gear 44 is attached to the outer peripheral surface of the cylinder 25. The bevel gear 44 is rotatable around the center line A1 relative to the cylinder 25. The bevel gear 44 is rotatably supported by the gear case 18 via a bearing 46. The bevel gear 44 meshes with the bevel pinion 43. The clutch 45 is attached to the outer peripheral surface of the cylinder 25. The clutch 45 is a sleeve that rotates integrally with the cylinder 25 and is movable in a direction along the center line A1 relative to the cylinder 25.

The mode switching dial 47 is provided on the outer surface of the housing 11, for example, on the outer surface of the gear case 18. The operator can switch between the rotary impact mode and the impact mode by operating the mode switching dial 47. When the operator operates the mode switching dial 47, the clutch 45 moves in a direction along the center line A1. Then, when the rotary impact mode is selected, the clutch 45 connects the rotational force transmission path between the bevel gear 44 and the cylinder 25. Therefore, the rotational force of the output shaft 34 is transmitted to the cylinder 25 via the driven gear 42, the rotating shaft 41, and the bevel gear 44, and the cylinder 25 and the tool holder 20 rotate integrally. On the other hand, when the impact mode is selected, the clutch 45 cuts off the rotational force transmission path between the bevel gear 44 and the cylinder 25. Therefore, the rotational force of the bevel gear 44 is not transmitted to the cylinder 25, and the cylinder 25 and the tool holder 20 do not rotate.

The handle 16 has a grip 48, a connection portion 49 connected to the grip 48, and a battery attachment portion 50. A trigger 51 and a trigger switch 52 are provided on the handle 16. The connection portion 49 is movably connected to the gear case 18 via a regulating mechanism 53 shown in Figure 5. The regulating mechanism 53 has a stopper 54, a contact member 55, and an elastic member 56. The stopper 54 is attached to the gear case 18, and the contact member 55 is attached to the connection portion 49. The stopper 54 and the contact member 55 are both made of steel. The elastic member 56 is a cylinder made of synthetic rubber, and is interposed between the stopper 54 and the contact member 55. Figure 5 shows an example in which multiple elastic members 56 are provided.

The battery mounting section 50 is connected to the motor case 19 so as to be rotatable around a rotation axis B1. The rotation axis B1 is a virtual line or a center of rotation in mechanical engineering, and is not an object. The battery mounting section 50 has a terminal 57 shown in FIG. 5 and a guide rail 58 shown in FIG. 3. The guide rail 58 is arranged in a straight line parallel to the center line A1. A control circuit 59 and an inverter circuit 60 are provided in the motor case 19. The control circuit 59 is a microcomputer having an input port, an output port, a central processing unit, etc. The inverter circuit 60 is connected to the stator 32 and has a plurality of switching elements. The trigger switch 52 is connected to the control circuit 59 by a signal cable 61, and the terminal 57 is connected to the control circuit 59 by a power cable 77. The control circuit 59 controls the inverter circuit 60.

A battery pack 62 is also provided in the battery attachment section 50. The battery pack 62 has a storage case 63, a cover 64 that covers the opening of the storage case 63, and a plurality of battery cells 65 housed within the storage case 63 and the cover 64. A board 66 is provided within the cover 64, and the board 66 is electrically connected to the battery cells 65. A terminal 67 is also provided on the board 66. As shown in Figure 3, a guide groove 72 is provided in the cover 64. The guide groove 72 is arranged in a straight line.

When the operator slides the battery pack 62 linearly relative to the battery mounting portion 50 and inserts the guide rail 58 into the guide groove 72, the battery pack 62 is attached to the battery mounting portion 50. When the battery pack 62 is attached to the battery mounting portion 50, the terminals 67 and 57 are electrically connected. As shown in Figure 2, when the battery pack 62 is attached to the battery mounting portion 50, the battery mounting portion 50 is positioned between the connection portion 49 and the battery pack 62 in the direction along the center line A2. When the battery pack 62 is removed from the battery mounting portion 50, the terminals 67 and 57 are electrically disconnected.

An example of how the hammer drill 10 is used is as follows. When the tool tip 23 is separated from the object W1, the handle 16 is stopped in the initial position shown in FIG. 3. The operator holds the side handle 17A with the first hand and the grip 48 with the second hand to press the tool tip 23 against the object W1. Then, the intermediate striker 26 is moved toward the air chamber 31 by the reaction force of the tool tip 23 being pressed against the object W1, the large diameter portion 27 comes into contact with the stopper 29, and the intermediate striker 26 stops. The striker 28 also closes the blank strike prevention hole. Furthermore, the handle 16 is rotated clockwise in FIG. 1 around the rotation axis B1, and the elastic member 56, which receives a load from the contact member 55, is elastically deformed. When the elastic member 56 is deformed by a predetermined amount, the handle 16 stops at the operating position shown in FIG. 5.

When the operator applies an operating force to the trigger 51 to turn on the trigger switch 52, the control circuit 59 controls the inverter circuit 60 to supply power from the battery pack 62 to the electric motor 12. The rotational force of the output shaft 34 of the electric motor 12 is converted by the power conversion mechanism 13 into the operating force of the piston 30, which reciprocates within the cylinder 25.

When the piston 30 operates in a direction away from the tool holder 20, air is sucked into the air chamber 31 through the breathing hole. Next, when the piston 30 operates to approach the tool holder 20, the pressure in the air chamber 31 rises, causing the striker 28 to strike the intermediate striker 26. The striking force received by the intermediate striker 26 is applied to the object W1 via the tool tip 23. Whether the rotational impact mode or impact mode is selected, the piston 30 reciprocates within the cylinder 25 while the output shaft 34 of the electric motor 12 is rotating, and the tool tip 23 is struck intermittently.

On the other hand, when the rotary impact mode is selected, the rotational force of the output shaft 34 is transmitted to the cylinder 25, causing the cylinder 25 to rotate. The rotational force of the cylinder 25 is transmitted to the tip tool 23 via the tool holder 20. In this way, the hammer drill 10 transmits impact force and rotational force to the tip tool 23. In contrast, when the impact mode is selected, the rotational force of the output shaft 34 is not transmitted to the cylinder 25 and the tool holder 20.

When the operating force on the trigger 51 is released and the trigger switch 52 is turned off, the control circuit 59 stops the electric motor 12. Also, when the tool tip 23 is moved away from the object W1, the handle 16 is rotated counterclockwise around the pivot axis B1 by the elastic restoring force of the elastic member 56 shown in FIG. 5, and the handle 16 is stopped at the initial position shown in FIG. 3. In this way, the handle 16 can be rotated around the pivot axis B1 relative to the housing 11 within a predetermined angle range, that is, between the initial position and the operating position. The predetermined angle by which the handle 16 can be rotated relative to the housing 11 is determined according to the amount of gap between the stopper 54 and the contact member 55 and the amount of elastic deformation of the elastic member 56.

Furthermore, when the tip tool 23 is separated from the object W1, both the intermediate striker 26 and the striker 28 are separated from the piston 30 by their own weight. Then, the large diameter portion 27 comes into contact with the tapered surface 24, and both the intermediate striker 26 and the striker 28 stop. As a result, the blank strike prevention hole is opened and the air chamber 31 is connected to the outside of the cylinder 25. Therefore, even if an operating force is applied to the trigger 51 to rotate the output shaft 34 of the electric motor 12 and operate the piston 30, the pressure in the air chamber 31 does not increase and no striking force is applied to the tip tool 23. In other words, blank strikes can be prevented.

When the output shaft 34 of the electric motor 12 is rotated to operate the piston 30 and the striker 28 strikes the intermediate striker 26, the housing 11 vibrates in a direction along the center line A1. When the vibration of the housing 11 is transmitted to the handle 16, the handle 16 vibrates about the rotation axis B1 relative to the housing 11. There is also a possibility that the battery pack 62 will vibrate relative to the handle 16.

The hammer drill 10 disclosed in this embodiment is capable of suppressing the vibration of the battery pack 62 relative to the handle 16. A mechanism for suppressing the vibration of the battery pack 62 will be specifically described. A first arm 68 is provided on the motor case 19. As shown in FIG. 1, the first arm 68 protrudes from the motor case 19 in a direction intersecting the center line A2. As an example, the first arm 68 extends from the motor case 19 in a direction along the center line A1. In the direction along the center line A1, the arrangement range of the cylinder case 17, the arrangement range of the motor case 19, and the arrangement range of the first arm 68 are different. In the direction along the center line A1, the arrangement range of the motor case 19 is located between the arrangement range of the cylinder case 17 and the arrangement range of the first arm 68. In other words, the first arm 68 extends in a direction opposite to the direction in which the cylinder case 17 protrudes relative to the motor case 19.

Furthermore, as shown in FIG. 4, two first arms 68 are provided at a distance from each other in the direction along the rotation axis B1. Each of the two first arms 68 has an insertion hole 69. The insertion hole 69 penetrates the first arm 68 in the direction along the rotation axis B1. As shown in FIG. 2, the insertion hole 69 is circular when viewed in the axial direction of the rotation axis B1. Furthermore, as shown in FIGS. 2 and 3, a second arm 70 is provided on the battery mounting portion 50. The second arm 70 extends from the battery mounting portion 50 in the direction along the center line A2. The first arm 68 and the second arm 70 form a support mechanism 73.

Also, as shown in FIG. 3, when viewed in the axial direction of the pivot axis B1, the placement area of the first arm 68 and the placement area of the second arm 70 overlap. FIG. 3 shows an example in which the entire placement area of the first arm 68 is included within the placement area of the second arm 70. Two second arms 70 are provided at intervals in the direction along the pivot axis B1 as shown in FIG. 4. The first arm 68 is provided between the second arms 70 in the direction along the pivot axis B1 as shown in FIG. 4. Each second arm 70 has a protrusion 71. The protrusion 71 extends in the direction along the pivot axis B1. The protrusion 71 is a sleeve provided centered on the pivot axis B1.

As shown in Figure 3, when viewed in the axial direction of the pivot axis B1, the outer peripheral shape of the protrusion 71 is circular. The two protrusions 71 are separately arranged in the insertion holes 69. In this way, the two protrusions 71 are respectively engaged with the first arms 68, and the handle 16 is supported by the motor case 19 via the first arms 68. In this way, because the support mechanism 73 is provided, the handle 16 can be rotated within a predetermined angle range around the pivot axis B1 relative to the housing 11.

The battery pack 62 attached to the battery mounting section 50 is located between the first support arms 68 in the direction along the pivot axis B1. In the example of Figs. 1 and 5, ten battery cells 65 are provided in the housing case 63. The battery cells 65 are arranged in two rows, with five cells in each row. The battery cells 65 are secondary batteries that can be charged and discharged, and the battery cells can be any of lithium ion batteries, nickel hydrogen batteries, lithium ion polymer batteries, and nickel cadmium batteries. The battery pack 62 is a DC power source. When the battery pack 62 is attached to the battery mounting section 50 as shown in Fig. 3, a part of the arrangement area of the first arm 68 and a part of the arrangement area of the second arm 70 are located within the arrangement area of the battery pack 62. Also, as shown in Fig. 2, when viewed in the axial direction of the pivot axis B1, the pivot axis B1 is located within the arrangement area of the battery pack 62.

As a result, when the handle 16 is vibrated around the pivot axis B1 relative to the housing 11, the battery pack 62 can be prevented from vibrating relative to the battery mounting section 50. This can prevent the terminals 57 and 67 from rubbing against each other. This can also prevent wear on the guide rail 58 and the guide groove 72. This can also prevent the battery pack 62 from moving inadvertently along the guide rail 58 and the guide groove 72, and can prevent the battery pack 62 from coming off the battery mounting section 50. This can also prevent an increase in the moment applied to the handle 16 around the pivot axis B1. This can therefore prevent the handle 16 from vibrating relative to the housing 11 around the pivot axis B1, and can reduce the load on the elastic member 56.

2, when viewed in the axial direction of the pivot axis B1, the center of gravity G1 of the battery pack 62 is located within the arrangement area E1 of the ten battery cells 65. Moreover, when viewed in the axial direction of the pivot axis B1 as in FIGS. 2 and 3, and when viewed in a perpendicular direction relative to the pivot axis B1 and center line A2 as in FIG. 4, the pivot axis B1 and the center of gravity G1 overlap. In other words, the pivot axis B1 passes through the center of gravity G1. Note that "the pivot axis B1 and the center of gravity G1 overlap" includes the center of gravity G1 being located within the arrangement range of the protrusion 71 when viewed in the axial direction of the pivot axis B1 shown in FIG. 3. Therefore, an increase in the moment applied to the battery pack 62 around the pivot axis B1 can be suppressed, and the battery pack 62 can be reliably suppressed from vibrating relative to the battery mounting section 50.

(Second embodiment) The hammer drill 10 of the second embodiment is shown in Figures 6, 7 and 8. In the configuration of the hammer drill 10 of the second embodiment, the same components as those of the hammer drill 10 of the first embodiment are given the same reference numerals as those of the hammer drill 10 of the first embodiment. The hammer drill 10 of the second embodiment has a support mechanism 74 that enables the handle 16 to rotate relative to the housing 11. Comparing the hammer drill 10 of the first embodiment with the hammer drill 10 of the second embodiment, the configuration of the support mechanism 73 and the configuration of the support mechanism 74 are different.

The support mechanism 74 has a guide groove 75 and a protrusion 76. The guide groove 75 is provided in the housing 11, for example, the motor case 19. The guide groove 75 is an arc-shaped hole or recess centered on the rotation axis B2. The protrusion 76 is provided in the battery mounting section 50. The rotation axis B2 is a virtual line or a rotation center in mechanical engineering, and the rotation axis B2 is not an object. The protrusion 76 is an arc-shaped rail or rib centered on the rotation axis B2. The arrangement range of the protrusion 76 centered on the rotation axis B2 is narrower than the arrangement range of the guide groove 75 centered on the rotation axis B2. The guide groove 75 and the protrusion 76 are provided on the same virtual circle C1 centered on the rotation axis B2 and at a position spaced apart from the rotation axis B2. The protrusion 76 is arranged in the guide groove 75, and the protrusion 76 can move in an arc shape centered on the rotation axis B1 within the guide groove 75.

When the hammer drill 10 of the second embodiment is viewed from the side as in Figures 6 and 8, the pivot axis B2 is located outside the arrangement area of the housing 11 and outside the arrangement area of the battery mounting part 50. For convenience, a portion of the imaginary circle C1 within a predetermined angle range is shown.

6 and 8, when the hammer drill 10 is viewed from the side, the pivot axis B2 is located within the arrangement area of the battery pack 62 when the battery pack 62 is attached to the battery attachment portion 50. Furthermore, when the battery pack 62 is attached to the battery attachment portion 50, the pivot axis B2 is located within the arrangement area E1. Furthermore, when the battery pack 62 is attached to the battery attachment portion 50, the pivot axis B2 is located at a position eccentric to the center of gravity G1 of the battery pack 62.

In the hammer drill 10 of the second embodiment, when the handle 16 vibrates relative to the housing 11, the protrusion 76 moves within the guide groove 75 around the pivot axis B2. That is, the handle 16 is vibrated within a predetermined angle range around the pivot axis B2. Furthermore, when viewed in a vertical direction relative to the pivot axis B2, the pivot axis B2 is located within the arrangement area of the battery pack 62. This makes it possible to suppress vibration of the battery pack 62 relative to the battery mounting portion 50. Therefore, the hammer drill 10 of the second embodiment can obtain the same effect as the hammer drill 10 of the first embodiment.

(Supplementary matters) An example of the technical meaning of the matters disclosed in this embodiment is as follows. The hammer drill 10 is an example of a work machine. The electric motor 12 is an example of a motor. The operating unit 15 is an example of an operating member. The housing 11 is an example of a housing. The handle 16 is an example of a handle. The battery pack 62 is an example of a battery pack. The connection unit 49 is an example of a first connection unit. The battery attachment unit 50 is an example of a second connection unit. The elastic member 56 is an example of an elastic member.

Figures 1, 2, 3, 5, 6, 7, and 8 are each an example of an "axial view of the rotation axis." A direction along center line A1 or a direction parallel to center line A1 is an example of an "operating direction of the operating member." In other words, center line A1 is a virtual line that indicates the operating direction of the operating member. A direction along center line A2 or a direction parallel to center line A2 is an example of a "direction intersecting the operating direction of the operating member."

The pivot axes B1 and B2 are each an example of a pivot axis. The center of gravity G1 is an example of the center of gravity of the battery pack. The first arm 68 is an example of a first element. The insertion hole 69 is an example of an insertion hole and a first engagement portion. The second arm 70 is an example of a second element. The protrusion 71 is an example of a second engagement portion. The guide groove 75 is an example of a first engagement portion. The protrusion 76 is an example of a second engagement portion. The guide rail 58 and the guide groove 72 are examples of a guide portion.

A diagram showing a hammer drill in a plane including center lines A1, A2, or in a plane parallel to center lines A1, A2, is an example of a "front view of the hammer drill." Also, a diagram showing a hammer drill in a plane including at least one of center lines A1 or A2 and perpendicular to the rotation axis is an example of a "view in the axial direction of the rotation axis."

The working machine is not limited to the disclosed embodiments, and various modifications are possible without departing from the spirit of the invention. For example, the working machine includes a hammer drill that applies a rotational force, an impact force along the center line, and a rotational force about the center line to the tool tip, as well as a hammer that applies an impact force along the center line to the tool tip, but does not apply a rotational force about the center line. The power conversion mechanism may be a cam mechanism instead of a crank mechanism. The electric motor may be either a brushless motor or a brushed motor.

The pivot axis may be either a virtual line in mechanical engineering or a solid object. For example, a protrusion, a cylinder, or a sleeve may be defined as the pivot axis. Furthermore, the pivot axis as an object may be provided in the housing, and a through hole into which the pivot axis as an object is inserted may be provided in the handle. Furthermore, the through hole into which the object as the pivot axis is inserted may be any of a through hole, a recess, or a groove. Furthermore, the housing may be a configuration called a casing, a body, or a main body of a work machine. Furthermore, "centered on the pivot axis" may also be defined as "with the pivot axis as the fulcrum."

Furthermore, the working machine may be one in which a virtual line indicating the operating direction of the operating member intersects with a center line indicating the center of rotation of the motor, or the virtual line and the center line are parallel, or the virtual line and the center line are arranged concentrically.

This embodiment also discloses the following work machine:

A work machine having a motor, an operating member operated by the motor, a housing supporting the motor and the operating member, a handle rotatably connected to the housing via a support mechanism and held by an operator, and a battery pack attached to the handle, the rotation axis of the support mechanism being located within the arrangement area of the battery pack when viewed in a vertical direction relative to the operating direction of the operating member and the center line of rotation of the motor. The battery pack is attached and detached to and from the handle along the operating direction of the operating member.

10...hammer drill, 11...housing, 12...electric motor, 15...actuating part, 16...handle, 49...connection part, 50...battery mounting part, 56...elastic member, 58...guide rail, 62...battery pack, 68...first arm, 69...insertion hole, 70...second arm, 71, 76...projection, 72, 75...guide groove, B1, B2...rotation axis, G1...center of gravity

Claims (12)

an actuating member actuated axially by a motor;
a housing supporting the actuating member;
a handle connected to the housing so as to be rotatable about a rotation axis extending along a direction perpendicular to the axial direction and held by an operator;
a battery pack attached to the handle;
A work machine having
The work machine, wherein the pivot shaft is located within an arrangement area of the battery pack when viewed in the axial direction of the pivot shaft. The handle is
a first connection portion connected to the housing;
a second connection portion connected to the housing and spaced apart from the first connection portion in a direction intersecting the axial direction when viewed in the axial direction of the rotation shaft;
having
The work machine according to claim 1 , wherein the battery pack is attached to the second connection portion. The work machine according to claim 2 , wherein the second connection portion is provided between the first connection portion and the battery pack in a direction intersecting the axial direction when viewed in the axial direction of the rotating shaft. The first connection portion is connected to the housing via an elastic member,
The work machine according to claim 2 or 3, wherein the second connection portion includes the rotation shaft and is connected to the housing so as to be rotatable about the rotation shaft. The work machine according to any one of claims 1 to 4, wherein the pivot shaft overlaps with the center of gravity of the battery pack when viewed in the axial direction of the pivot shaft. The work machine according to any one of claims 1 to 4, wherein the rotating shaft is provided at a position eccentric from the center of gravity of the battery pack when viewed in the axial direction of the rotating shaft. a first element provided in the housing and having a circular insertion hole centered on the rotation axis;
a second element provided on the handle and rotated about the rotation shaft while being inserted into the insertion hole of the first element;
7. A work machine according to any one of claims 1 to 6, comprising: The work machine according to claim 7, wherein the first element and the second element are provided in a plurality of elements spaced apart from one another in a direction along the rotation axis. A first engagement portion provided on the housing;
a second engagement portion provided on the handle and movable along the first engagement portion while engaged with the first engagement portion;
However, it is further provided,
The work machine according to claim 1 , wherein the handle is rotatable about the rotation shaft relative to the housing in a state in which the first engagement portion and the second engagement portion are engaged with each other. The work machine according to claim 9, wherein the first engaging portion and the second engaging portion are provided on the same circumference centered on the rotating shaft and at a position spaced apart from the rotating shaft when viewed in the axial direction of the rotating shaft. The work machine according to any one of claims 1 to 10, further comprising a guide portion for sliding the battery pack relative to the handle so that the battery pack can be attached to and detached from the handle. the motor is an electric motor that rotates by power supplied from the battery pack,
12. The work machine according to claim 1, wherein the electric motor and the actuating member are provided in the housing.

Images