JP6439382B2 - Power working machine - Google Patents

Description

  The present invention relates to a power working machine that operates a work tool with the power of a motor.

  A power work machine that operates a work tool with the power of a motor is described in Patent Document 1. The power working machine described in Patent Document 1 is a hammer drill. The hammer drill described in Patent Document 1 includes a motor provided in a housing, a tool support member that is rotated by the power of the motor and supports a work tool, and a power conversion mechanism that converts the power of the motor into a striking force. And an intermediate for transmitting the striking force to the work tool. The power conversion mechanism includes a cylindrical cylinder, a piston provided in the cylinder, and a striker disposed in the cylinder and forming a pressure chamber between the piston. The piston, the striker, and the intermediate element are operating members that move in a direction along the center line of the cylinder.

  The hammer drill can be switched between a hammer mode and a hammer drill mode. When the hammer mode is selected, the power of the motor is converted into a striking force, and the striking force is transmitted to the work tool. When the hammer drill mode is selected, in addition to the impact force being transmitted to the work tool, the rotational force is transmitted to the work tool.

  In the hammer drill described in Patent Document 1, a sensor unit is provided in a housing. The sensor unit includes a control board and a tilt sensor attached to the control board. The tilt sensor is a sensor that detects the tilt angle of the work tool with respect to 0 degrees when the work tool is pressed against the ground and the work tool is perpendicular to 0 degrees and the housing is tilted. Then, control is performed to turn on LED (light emitting diode) lamps of different colors according to the tilt angle of the work tool. In addition, the sensor unit includes an elastic member disposed so as to wrap the sensor substrate to which the tilt sensor is attached. Furthermore, the vibration transmitted to the control board can be reduced, and the tilt sensor can be prevented from being damaged.

JP 2013-94870 A

  However, the power working machine described in Patent Document 1 is limited to the provision of an elastic body between the control board and the housing, and there is a possibility that the vibration of the control board cannot be sufficiently reduced.

  The objective of this invention is providing the power working machine which can suppress that the vibration of a housing is transmitted to a control board.

The present invention is a power working machine that operates a work tool in a direction along a first axis with the power of a motor, and includes a control board that controls the motor, a board case that houses the control board, and the board case A housing supporting the motor, and an elastic body interposed between the substrate case and the housing, the housing being fixed to the first housing , the first housing housing the motor, and the substrate. A second housing housing the case , wherein the substrate case is provided on a plate portion extending in a direction along a second axis intersecting the first axis, and on an outer peripheral edge of the plate portion, and the plate portion and a side wall extending in a direction along the first axis from said elastic body, said first direction along the axis, between said plate portion first housing, and / or Is interposed between said side wall second housing.

  In the present invention, the vibration of the housing is reduced by the elastic body, and the vibration of the housing can be prevented from being transmitted to the control board.

1 is a front sectional view of an electric working machine corresponding to Embodiment 1 of the present invention. It is a block diagram which shows the control circuit of the electric working machine of FIG. It is front sectional drawing to which the principal part of the electric working machine of FIG. 1 was expanded. It is a side view of the control unit used for the electric working machine of FIG. It is sectional drawing which shows the connection structure of the connector and lead wire shown in FIG. It is sectional drawing of the display case provided in the electric working machine of FIG. It is the side view which removed the cover of the display case shown in FIG. It is front sectional drawing which shows a part of electric working machine equivalent to Embodiment 2 of this invention.

  Hereinafter, the power working machine in embodiment of this invention is demonstrated in detail based on drawing.

(Embodiment 1)
The power working machine in Embodiment 1 of this invention is demonstrated with reference to FIGS. The electric working machine 10 as a power working machine is also called a hammer drill. The electric working machine 10 is used for drilling a target such as concrete or stone.

  The electric work machine 10 includes a work machine main body 12, and the work machine main body 12 is assembled by fixing a cylinder housing 13, an intermediate case 14, a handle 15, a motor housing 20, and a bottom cover 17 to each other. The bottom cover 17 is fixed to the motor housing 20 by a screw member 162. The bottom cover 17 is disposed next to the motor housing 20 in a direction along the axis B1. A vent hole 17 a penetrating the bottom cover 17 is provided.

  The cylinder housing 13 has a cylindrical shape, and a cylindrical cylinder 18 is provided in the cylinder housing 13. The cylinder 18 is disposed around the axis A <b> 1, and a cylindrical tool holder 19 is provided concentrically with the cylinder 18. The tool holder 19 is provided in the cylinder housing 13, and the tool holder 19 is rotatably supported by the bearing 16. The cylinder 18 and the tool holder 19 are connected so as to be integrally rotatable. The tip tool 11 is attached to the tool holder 19, and the rotational force of the cylinder 18 is transmitted to the tip tool 11.

  A metal intermediate striker 21 is provided from the tool holder 19 to the cylinder 18. The intermediate striker 21 can reciprocate in the direction along the axis A1. A striker 22 that strikes the intermediate striker 21 is provided in the cylinder 18. The striker 22 can reciprocate in the direction along the axis A1. A piston 23 is disposed in the cylinder 18, and the piston 23 can reciprocate in a direction along the axis A1. An air chamber 24 is provided in the cylinder 18 between the striker 22 and the piston 23.

  The intermediate case 14 is disposed between the handle 15 and the cylinder housing 13 in a direction along the axis A1. The motor housing 20 is fixed to the cylinder housing 13 and the intermediate case 14. The arrangement range of the motor housing 20 in the direction along the axis A1 overlaps with the arrangement range of the intermediate case 14 in the direction along the axis A1. The handle 15 is bent in an arch shape, and both ends of the handle 15 are attached to the intermediate case 14. A trigger 132 and a power supply cable 25 are provided on the handle 15. In addition, a trigger switch 26 is provided on the handle 15. When the operator operates the trigger 132, the trigger switch 26 is turned on / off.

  The motor housing 20 is integrally formed of a conductive metal material, for example, aluminum. The motor housing 20 has a cylindrical shape, and a motor case 27 is disposed inside the motor housing 20. The motor case 27 is integrally formed of an insulating material such as synthetic resin. The motor case 27 has a cylindrical portion 27 a as shown in FIG. 3, and the cylindrical portion 27 a of the motor case 27 is press-fitted and fixed to the motor housing 20. The motor case 27 has a bottom portion 28 that is continuous with the cylindrical portion 27 a, and a shaft hole 29 is formed in the bottom portion 28. The inside of the motor case 27 is connected to the outside of the work machine body 12 through the shaft hole 29 and the vent hole 17a.

  A brushless motor 30 is housed in the motor case 27. The brushless motor 30 is a direct current electric motor, and the brushless motor 30 includes a cylindrical stator 31 and a rotor 32 disposed inside the stator 31. The rotor 32 includes an output shaft 33 and a rotor core 32 a fixed to the output shaft 33. In a front view of the electric work machine 10, the axis B1 that is the rotation center of the output shaft 33 intersects the axis A1, specifically, substantially orthogonal. The motor housing 20 is disposed between the bottom cover 17 and the cylinder housing 13 in a direction along the axis B1. The motor housing 20 includes a bearing support portion 34 located in the bottom cover 17. The intermediate case 14 includes a partition wall 35 extending into the cylinder housing 13, and a bearing 36 supported by the partition wall 35 and a bearing 37 supported by a bearing support portion 34 are provided. The two bearings 36 and 37 are arranged at different positions in the direction along the axis B <b> 1 of the output shaft 33. The first end portion of the output shaft 33 is disposed in the shaft hole 29, and the second end portion of the output shaft 33 is disposed in the intermediate case 14. A drive gear 38 is provided on the outer peripheral surface of the output shaft 33 at a position arranged in the intermediate case 14.

  An insulator 39 is provided in the motor case 27. The insulator 39 is disposed between the brushless motor 30 and the bearing 36 in the direction along the axis B1. The insulator 39 includes a shaft hole 40, and the output shaft 33 is disposed in the shaft hole 40. The insulator 39 is made of synthetic resin and is provided in the motor case 27 so as not to rotate. The insulator 39 is fixed to the stator 31.

  A fan 41 is provided in the motor case 27 between the insulator 39 and the bearing 36. The fan 41 is fixed to the output shaft 33, and the fan 41 rotates together with the output shaft 33 and plays a role of introducing air outside the work implement main body 12 into the work implement main body 12. The outside of the work machine body 12 and the inside of the intermediate case 14 are connected by a vent hole 14a.

  The structure of the fan 41 that cools the brushless motor 30 will be described with reference to FIG. The fan 41 is annular, and the fan 41 is attached to the output shaft 33. That is, the fan 41 rotates with the output shaft 33. The fan 41 is formed of a synthetic resin that is a nonmagnetic material, and a permanent magnet 45 is attached to the fan 41. The permanent magnet 45 is an annular body centered on the axis B <b> 1, and N poles and S poles which are different magnetic poles are alternately arranged along the circumferential direction of the permanent magnet 45.

  A connection board 47 is provided in the motor case 27. The connection substrate 47 is fixed to the insulator 39, for example. That is, the connection board 47 is attached to the stator 31 via the insulator 39. The connection board 47 is disposed between the stator 31 and the permanent magnet 45 attached to the fan 41 in the direction along the axis B1. A hole 48 penetrating the connection substrate 47 in the thickness direction is provided, and the output shaft 33 is disposed in the hole 48. The connection board 47 is formed of a non-magnetic material such as synthetic resin, and the magnetic sensors S1 to S3 are attached to the connection board 47.

  FIG. 2 shows a control circuit for controlling the electric working machine 10. The brushless motor 30 uses a commercial power supply 49 as a power source, and the power of the commercial power supply 49 flows to the coil of the brushless motor 30 via the power supply cable 25.

  The stator 31 of the brushless motor 30 includes coils U1, V1, and W1 corresponding to the U phase, the V phase, and the W phase, and the rotor core 32a has two types of permanent magnets that are spaced apart in the circumferential direction and have different polarities. Four magnets 32b are provided, and permanent magnets 32b having different polarities are alternately arranged. The three magnetic sensors S1 to S3 output detection signals indicating the rotational position of the rotor 32. The three magnetic sensors S1 to S3 are provided corresponding to the three-phase coils U1, V1, and W1. Each of the magnetic sensors S <b> 1 to S <b> 3 is a non-contact sensor that detects the magnetic force generated by the permanent magnet 45 attached to the fan 41 and converts the magnetic force into an electric signal and outputs the electric signal. Hall elements can be used for the magnetic sensors S1 to S3.

  The electric work machine 10 includes an inverter circuit 121 that controls the current supplied to the coils U1, V1, and W1. A rectifier circuit 53 for rectifying an alternating current of the commercial power supply 49 into a direct current is provided in an electric circuit between the commercial power supply 49 and the inverter circuit 121. The rectifier circuit 53 is configured by bridge-connecting a plurality of diodes 53a. A smoothing capacitor 55 is provided between the rectifier circuit 53 and the inverter circuit 121. The smoothing capacitor 55 smoothes the voltage rectified from AC to DC by the rectifier circuit 53. Further, a diode 56 and a capacitor 57 are provided between the inverter circuit 121 and the smoothing capacitor 55. The diode 56 and the capacitor 57 are arranged in series with each other. The diode 56 and the capacitor 57 are a power supply circuit that supplies power from the commercial power supply 49 to the controller 136, and the power supply cable 25 is connected to the commercial power supply 49 to stabilize the voltage applied from the commercial power supply 49 to the controller 136. .

  The inverter circuit 121 is a three-phase full bridge inverter circuit, and includes switching elements Tr1 to Tr6. Each of the switching elements Tr1 to Tr6 is an insulated gate bipolar transistor (IGBT). The switching element Tr1 includes a collector C1, a gate G1, and an emitter E1. The switching element Tr2 includes a collector C2, a gate G2, and an emitter E2. The switching element Tr3 includes a collector C3, a gate G3, and an emitter E3. The switching element Tr4 includes a collector C4, a gate G4, and an emitter E4. The switching element Tr5 includes a collector C5, a gate G5, and an emitter E5. The switching element Tr6 includes a collector C6, a gate G6, and an emitter E6. The collectors C1, C3, and C5 are connected to the positive electrode 49a of the commercial power supply 49, respectively, and the collectors C1, C3, and C5 are connected in parallel to each other. That is, the collectors C1, C3, and C5 are on the high side.

  The emitter E1 and the collector C2 are connected in parallel with each other and connected to the lead wire 58. The emitter E3 and the collector C4 are connected in parallel with each other and connected to the lead wire 62. Further, the emitter E5 and the collector C6 are connected in parallel to each other and connected to the lead wire 65. Further, a voltage as a control signal is applied to the gates G1 to G6. Further, the emitters E2, E4, E6 are respectively connected to the negative electrode 49b of the commercial power source 49, and the emitters E2, E4, E6 are connected in parallel to each other. That is, the emitters E2, E4, E6 are on the low side.

  In addition, a lead wire 60 connected to the coil U1 is provided, and a connector 59 for connecting the lead wire 58 and the lead wire 60 is provided. A lead wire 64 connected to the coil V1 is provided, and a connector 63 for connecting the lead wire 62 and the lead wire 64 is provided. A lead wire 67 connected to the coil W1 is provided, and a connector 66 for connecting the lead wire 67 and the lead wire 65 is provided.

  The lead wires 58, 62, and 65 are each covered with a protective tube 143 as shown in FIG. The lead wire 58 is connected to the insertion hole 59a of the connector 59, the lead wire 62 is inserted into the insertion hole 63a of the connector 63, and the lead wire 65 is inserted into the insertion hole 66a of the connector 66. The lead wires 60, 64, and 67 are each covered with a protective tube 143.

  Furthermore, a heat shrinkable tube 145 is provided to cover the connection points between the connectors 59, 63, 66 and the protective tubes 143, respectively. Each protective tube 143 is made of an insulating material such as silicone rubber. For example, polyolefin is used for each heat shrinkable tube 145. Each heat-shrinkable tube 145 prevents each protective tube 143 from coming out of the insertion holes 59a, 63a, 66a of the connectors 59, 63, 66. Conductive plugs 169 are attached to the end portions of the lead wires 58, 62, and 65, and the plugs 169 are disposed in the connectors 59, 63, and 66, respectively. The connectors 59, 63, 66, the plug 169, and the lead wires 60, 64, 67 are pressed from the outside in the radial direction to be crimped, and the plug 169 is fixed to the lead wires 58, 62, 65. The plug 169 is connected to the lead wires 60, 64, and 67, respectively.

  The lead wires 146 and 147 connecting the control board 71 and the power supply cable 25 are covered with a protective tube 148. It is also possible to connect the lead wires 146 and 147 and the power supply cable 25 using a connector and a heat shrinkable tube in the same manner as described above.

  And the commutation operation | movement with respect to each coil U1, V1, W1 is controlled by controlling the timing which turns on and off the control signal input into the gates G1-G6 of the switching elements Tr1-Tr6, and the ON period, ie, a duty ratio. Is done.

  The motor control unit 133 calculates and outputs a control signal for controlling the inverter circuit 121. The motor control unit 133 includes a controller 136, a control signal output circuit 134, a rotor position detection circuit 135, a motor rotation speed detection circuit 68, and a motor current detection circuit 69. The detection signals of the magnetic sensors S1 to S3 are sent to the rotor position detection circuit 135. The rotor position detection circuit 135 detects the rotational position of the rotor 32.

  The rotor position detection circuit 135 processes a signal indicating the rotational position of the rotor 32. The signal output from the rotor position detection circuit 135 is sent to the controller 136 and the motor rotation number detection circuit 68. The motor rotation speed detection circuit 68 detects the motor rotation speed, and the signal output from the motor rotation speed detection circuit 68 is input to the controller 136.

  The motor current detection circuit 69 is connected to both ends of the current detection resistor 122, and the motor current detection circuit 69 detects a current value flowing through the brushless motor 30. A signal output from the motor current detection circuit 69 is input to the controller 136. The controller 136 includes a microprocessor that processes control signals and a memory, and the memory stores a control program, arithmetic expressions, data, and the like. The controller 136 processes the signal input from the motor rotation speed detection circuit 68 and calculates the actual rotation speed of the rotor 32. The signal output from the controller 136 is input to the control signal output circuit 134, and the inverter circuit 121 is controlled by the control signal input from the control signal output circuit 134.

  In the work machine body 12, a control board 71 on which a rectifier circuit 53, a smoothing capacitor 55, a diode 56, a capacitor 57, an inverter circuit 121, a current detection resistor 122, and a controller 136 are provided. The control board 71 is disposed outside the motor housing 20 and in the intermediate case 14. The control board 71 is disposed outside the motor housing 20 in the radial direction centered on the axis B1. The control board 71 is disposed between the motor housing 20 and the handle 15 in a direction along the axis A1. The thickness direction of the control board 71 is the same as the radial direction around the axis B.

  The control board 71 is integrally formed of an insulating material, for example, a synthetic resin. The arrangement range of the control board 71 in the direction along the axis B1 overlaps with the arrangement range of the motor housing 20 in the direction along the axis B1. Furthermore, signal lines 75 are provided for sending the signals of the magnetic sensors S1 to S3 separately to the rotor position detection circuit 135, respectively.

  The switching elements Tr <b> 1 to Tr <b> 6 each have three terminals connected to the collector, emitter, and gate, and the three terminals are fixed to the control board 71. The switching elements Tr1, Tr3, Tr5 are arranged in one row, and the switching elements Tr2, Tr4, Tr6 are arranged in one row. Further, the switching elements Tr1, Tr3, Tr5 and the switching elements Tr2, Tr4, Tr6 are arranged in parallel. One heat sink 78 that contacts the switching elements Tr1, Tr3, Tr5 is provided. One heat sink 78 is fixed to the switching elements Tr1, Tr3, Tr5 by a screw member 155.

  A heat sink 79 in contact with the switching element Tr2, a heat sink 80 in contact with the switching element Tr4, and a heat sink 81 in contact with the switching element Tr6 are provided. The heat sink 79 is fixed to the switching element Tr2 by the screw member 155, the heat sink 80 is fixed to the switching element Tr4 by the screw member 155, and the heat sink 81 is fixed to the switching element Tr6 by the screw member 155. The heat sinks 78 to 81 are made of a metal having thermal conductivity, such as aluminum or copper. The heat sinks 78 to 81 cool the switching elements Tr1 to Tr6 by transferring heat of the switching elements Tr1 to Tr6 to the air.

  As shown in FIG. 4, a heat sink 168 is attached to the rectifier circuit 53. The surface 168a of the heat sink 168 is flat, and the surface 168a is inclined with respect to the axis B1. The surface 168a is inclined in a direction close to the switching element Tr5.

  Further, a substrate case 82 is provided on the side of the brushless motor 30 in the radial direction centered on the axis B1. The substrate case 82 is disposed outside the motor housing 20. The substrate case 82 is fixed to the motor housing 20 using a screw member. The control board 71 is attached to the board case 82. A storage chamber 161 is formed between the substrate case 82 and a cover 160 provided on the intermediate case 14. The substrate case 82 is disposed in the accommodation chamber 161. The substrate case 82 has a tray shape having a plate portion 83 disposed in parallel with the axis B <b> 1 and a side wall 84 provided on the outer peripheral edge of the plate portion 83. The side wall 84 projects away from the motor housing 20 and in a direction along the axis A1. The substrate case 82 is integrally formed of an insulating material, for example, a synthetic resin. The plate portion 83 is disposed between the motor housing 20 and the control board 71 in the direction along the axis A1. The substrate case 82 includes a plurality of boss portions 82a provided outside the side wall 84, and a screw member is inserted into the hole 82b of the boss portion 82a.

  The control board 71 is disposed in a space surrounded by the side wall 84, and the control board 71 is parallel to the plate portion 83. Cylindrical portions 85 and 86 that are continuous with the plate portion 83 are provided, and a passage 87 is provided in the cylindrical portions 85 and 86. A hole 90 that penetrates the motor case 27 is provided, and a hole 89 that penetrates the motor housing 20 is provided. The cylinder portion 85 is disposed in the hole portions 89 and 90. A hole 88 that penetrates the control board 71 in the thickness direction is provided, and the cylindrical portion 86 is disposed in the hole 88. A storage chamber 161 is formed between the substrate case 82 and the cover 160. The passage 87 connects the inside of the motor case 27 and the accommodation chamber 161. The lead wires 60, 64, 67 and the signal line 75 are passed through the passage 87.

  Further, the intermediate case 14 is provided with a cover 160 that covers the substrate case 82. The intermediate case 14 and the motor housing 20 are fixed to each other, the cover 160 covers the substrate case 82, and an accommodation chamber 161 is formed between the cover 160 and the substrate case 82. A control unit 130 is configured by the substrate case 82 and the control substrate 71 to which electrical components are attached.

  In the process of assembling the control unit 130, the resin layer 200 is formed by pouring resin into the substrate case 82 in a state where the control substrate 71 is housed in the substrate case 82 and solidifying the resin. The resin layer 200 covers the entire surface of the control board 71 and is in close contact with the surface of the control board 71. The resin layer 200 is waterproof and dustproof for the control unit 130. In FIG. 4, the resin layer 200 is omitted for convenience. The electrical components are elements that control the rotational speed, rotational speed, torque, and rotational direction of the brushless motor 30. The electrical components are the rectifier circuit 53, the switching elements Tr1 to Tr6, the smoothing capacitor 55, the diode 56, the capacitor 57, and the current. A detection resistor 122 and a controller 136 are included.

  Further, a display plate case 141 is provided in the intermediate case 14. The display panel case 141 is disposed outside the accommodation chamber 161. The arrangement area of the display panel case 141 is different from the arrangement area of the control unit 130 in the direction along the axis B1. The display panel case 141 includes a substrate holder 98 that is fixed to a partition in the cylinder housing 13 and a cover 96 that covers the operation substrate 91 attached to the substrate holder 98. A storage chamber 159 is formed by the cover 96 and the substrate holder 98, and a gap between the cover 96 and the substrate holder 98 is sealed with a sealing material such as a resin coating or silicon rubber. An operation substrate 91 is provided in the storage chamber 159. The operation board 91 is provided with an operation switch 51, an energizing lamp 92 that displays whether power is supplied, and a speed display lamp 157. Both the energization lamp 92 and the speed display lamp 157 are LED lamps. The operation substrate 91 is held by the intermediate case 14 via the substrate holder 98.

  An electric wire 93 for connecting the operation board 91 and the control board 71 is provided. An opening 158 is provided between the substrate holder 98 and the cover 96, and the electric wire 93 is passed through the opening 158. A socket portion 167 for connecting the electric wire 93 and the control board 71 is provided. The opening 158 connects the inside of the control unit 130 and the storage chamber 159 of the display panel case 141. A window portion 95 is opened in the intermediate case 14, and a cover 96 is disposed on the window portion 95.

  An operation button 97 is attached to the cover 96, and when the operator operates the operation button 97, the operation switch 51 is operated, and an operation signal of the operation switch 51 is input to the controller 136, and the controller 136 receives the target rotation speed. Switch. The target rotation speed can be switched, for example, in four stages, and four speed display lamps are provided. Further, the cover 96 includes a speed display unit 52 and an energization display unit 163 that display the target rotational speed stage of the brushless motor 30. The cover 96 is integrally formed of synthetic resin and has light transmittance. For this reason, the operator can visually recognize the light of the energization lamp 92 and the speed display lamp 157 from the outside of the display panel case 141. The speed display lamp 157 corresponding to the selected target rotational speed is turned on, and the speed display lamp 157 corresponding to the unselected target rotational speed is turned off. In addition, when the power supply cable 25 is connected to the commercial power supply 49, the power supply lamp 92 is turned on, and when the power supply cable 25 is disconnected from the commercial power supply 49, the power supply lamp 92 is turned off.

  The power conversion mechanism 120 that converts the rotational force of the output shaft 33 of the brushless motor 30 into the reciprocating force of the piston 23 will be described. First, a crankshaft 106 is rotatably provided in the intermediate case 14. The crankshaft 106 is parallel to the output shaft 33, and a driven gear 107 provided on the crankshaft 106 is engaged with the drive gear 38. A crankpin 108 that is eccentric from the rotation center of the crankshaft 106 is attached to the crankshaft 106.

  Further, a connecting rod 109 is provided for connecting the crank pin 108 and the piston 23 so that power can be transmitted. When the rotational force of the output shaft 33 is transmitted to the crankshaft 106 and the crankpin 108 revolves, the piston 23 reciprocates within the cylinder 18. The power conversion mechanism 120 includes a crankshaft 106, a crankpin 108, and a connecting rod 109.

  Next, a mechanism for converting the rotational force of the output shaft 33 into the rotational force of the cylinder 18 will be described. A rotational force transmission shaft 110 is rotatably provided in the cylinder housing 13, and a driven gear 111 is provided. The driven gear 111 meshes with the drive gear 38. The rotational force transmission shaft 110 is rotatably supported by bearings 113 and 114. For this reason, the rotational force of the output shaft 33 is transmitted to the rotational force transmission shaft 110. Further, a bevel gear 115 is provided on the rotational force transmission shaft 110.

  On the other hand, a cylindrical bevel gear 116 is attached to the outer periphery of the cylinder 18, and the bevel gear 116 can rotate with respect to the cylinder 18. The bevel gear 116 meshes with the bevel gear 115. A sleeve 117 that rotates integrally with the cylinder 18 and is movable in the direction along the axis A <b> 1 is attached to the outer periphery of the cylinder 18. The electric working machine 10 includes a mode switching dial 123, and when the operator operates the mode switching dial 123, the sleeve 117 moves in a direction along the axis A1. Further, a clutch mechanism for engaging or releasing the sleeve 117 and the bevel gear 116 is provided.

  When the sleeve 117 moves along the axis A <b> 1 with respect to the cylinder 18, the sleeve 117 is engaged with the bevel gear 116 so as to transmit power, or the sleeve 117 is released from the bevel gear 116. When the sleeve 117 is engaged with the bevel gear 116, the rotational force of the rotational force transmission shaft 110 is transmitted to the cylinder 18. On the other hand, when the sleeve 117 is released from the bevel gear 116, the rotational force of the rotational force transmission shaft 110 is not transmitted to the cylinder 18.

  A usage example of the electric working machine 10 will be described. When the operator operates the trigger 132 and the trigger switch 26 is turned on or off, a signal output from the trigger switch is sent to the controller 136. When the on signal of the trigger switch is input to the controller 136, the control signal output from the control signal output circuit 134 is input to the inverter circuit 121, and the switching elements Tr1 to Tr6 are individually turned on and off, and the coils U1, A current flows sequentially through V1 and W1. Then, the coils U1, V1, W1 and the permanent magnet 32b cooperate to form a rotating magnetic field, and the rotor 32 of the brushless motor 30 rotates.

  The controller 136 performs control to bring the actual rotational speed of the rotor 32 closer to the target rotational speed. The actual rotational speed of the rotor 32 is controlled by adjusting the voltage applied to the coils U1, V1, and W1. Specifically, it is performed by adjusting the duty ratio of the ON signal applied to the gates G1 to G6 of the switching elements Tr1 to Tr6 of the inverter circuit 121. When the rotor 32 of the brushless motor 30 rotates, the rotational force of the output shaft 33 is converted into the reciprocating force of the piston 23 by the power conversion mechanism 120, and the piston 23 reciprocates in the cylinder 18.

  When the piston 23 moves in a direction approaching the crankshaft 106, the pressure in the air chamber 24 decreases and the striker 22 moves away from the intermediate striker 21. When the striker 22 moves away from the intermediate striker 21, air is not sucked into the air chamber 24. Further, after the piston 23 reaches the top dead center, the piston 23 moves from the top dead center toward the bottom dead center, and the pressure in the air chamber 24 increases. Then, the striker 22 strikes the intermediate striker 21. The striking force applied to the intermediate striking element 21 is transmitted to the object via the tip tool 11. Thereafter, while the output shaft 33 of the brushless motor 30 is rotating, the striker 22 reciprocates in the cylinder 18, and the striker 22 strikes the intermediate striker 21 intermittently.

  On the other hand, the rotational force of the output shaft 33 of the brushless motor 30 is transmitted to the rotational force transmission shaft 110 via the driven gear 111. When the mode switching dial 123 is operated and the impact / rotation mode is selected, the rotational force of the rotational force transmission shaft 110 is transmitted to the cylinder 18 and the cylinder 18 rotates. The rotational force of the cylinder 18 is transmitted to the tip tool 11 through the tool holder 19. Thus, the electric working machine 10 transmits the striking force and the rotational force to the tip tool 11. On the other hand, when the mode switching dial 123 is operated and the striking mode is selected, the rotational force of the rotational force transmission shaft 110 is not transmitted to the cylinder 18.

  Further, when the output shaft 33 of the brushless motor 30 rotates, the fan 41 rotates, and air outside the work machine body 12 passes through the vent hole 17a and the shaft hole 29 and is sucked into the motor case 27. And the heat of the brushless motor 30 is transmitted to air, and the brushless motor 30 is cooled. Further, air outside the motor housing 20 is introduced into the intermediate case 14 through the vent hole 14a. For this reason, air flows along the substrate case 82 accommodated in the accommodation chamber 161, and heat of the rectifier circuit 53 and the switching elements Tr1 to Tr6 is transmitted to the air. Therefore, the temperature rise of the rectifier circuit 53 and the switching elements Tr1 to Tr6 is suppressed.

  Since the air introduced into the intermediate case 14 is given a moving direction along the surface 168a of the heat sink 168, the amount of air contacting the switching elements Tr1 to Tr6 can be increased as much as possible. The cooling efficiency is improved. The air deprived of heat from the rectifier circuit 53 and the switching elements Tr <b> 1 to Tr <b> 6 is introduced into the motor case 27 through the passage 87. Air sucked into the motor case 27 by the rotation of the fan 41 is discharged into the cylinder housing 13 by the fan 41, passes through an exhaust port provided in the cylinder housing 13, and is discharged to the outside of the work machine body 12.

  In the electric working machine 10 of the present embodiment, the piston 23, the striker 22, and the intermediate striker 21 operate in the direction along the axis A1. Further, the striking force applied to the tip tool 11 is generated in the direction along the axis A1. That is, the work machine body 12 vibrates in the direction along the axis A1. The thickness direction of the control board 71 is the same as the direction along the axis A1, and the length direction of the control board 71 is parallel to the axis B1. When the work implement body 12 vibrates in the direction along the axis A <b> 1, vibration is transmitted to the control board 71 in the thickness direction.

  The electric working machine 10 of the present embodiment includes a vibration suppression mechanism that suppresses the control unit 130 from vibrating in the direction in which the impact force is applied to the tip tool 11, that is, the direction along the axis A1. The vibration suppressing mechanism includes elastic bodies 152 to 154 provided on the substrate case 82. The elastic body 152 is fixed to the outer surface of the plate portion 83, and the elastic body 153 is fixed to the edge of the side wall 84. The elastic body 152 is provided with the same thickness over the entire outer surface of the plate portion 83. The elastic body 152 is in contact with the motor housing 20 in a state where the substrate case 82 is attached to the motor housing 20. Further, an elastic body 154 is fixed to the boss portion 82a. In a state where the intermediate case 14 and the motor housing 20 are fixed, the elastic body 153 and the elastic body 154 are in contact with the intermediate case 14.

  The elastic bodies 152 to 154 are integrally formed of rubber-like elastic bodies, and the elastic bodies 152 to 154 are fixed to the substrate case 82 using a double-sided tape. The elastic bodies 152 to 154 may be fixed to the substrate case 82 using an adhesive.

  The elastic body 152 and the elastic body 153 are arranged at different positions in the direction along the axis A1. The substrate case 82 is disposed between the elastic body 152 and the elastic body 153 in the direction along the axis A1. The elastic body 154 may be disposed at the same position as the elastic body 153 in the direction along the axis A1, or may be disposed at a position different from the elastic body 153 in the direction along the axis A1. .

  In the electric working machine 10 according to the present embodiment, since the elastic bodies 152 and 153 are provided between the substrate case 82 and the work machine body 12 that supports the board case 82, the vibration of the work machine body 12 is controlled by the control unit. Transmission to 130 can be suppressed. In particular, when the work implement body 12 vibrates in the direction along the axis A1, the elastic bodies 152 and 153 reduce vibration. For this reason, it can suppress that the vibration of the working machine main body 12 is transmitted to the control unit 130. Therefore, it is possible to suppress the vibration of the electrical component attached to the control board 71.

  Furthermore, since the control board 71 can be reinforced by accommodating the control board 71 in the board case 82, the control board 71 can be prevented from being distorted by the vibration of the work machine body 12. For example, a structure in which the work piece main body is assembled by fixing the component pieces divided into two in the direction along the axis A1 to each other will be described. In the case where the control board is sandwiched and supported by the two divided pieces, it is also conceivable that the two pieces are displaced from each other due to the vibration of the work implement body. As a result of the displacement of the two constituent pieces, the control board may be distorted and damaged.

  Even if the work machine main body has a structure in which the control board is sandwiched and supported by two divided pieces, if the control board 71 is accommodated in the board case 82 as in the present embodiment, the two pieces are displaced. Is not transmitted to the control board 71, and the distortion of the control board 71 can be suppressed. Further, the resin layer 200 is formed by filling the substrate case 82 with resin. For this reason, the resin layer 200 can absorb external force to further suppress the distortion of the control board 71 and can also protect the control board 71 from dust and the like.

  Furthermore, since the storage chamber 159 for storing the operation substrate 91 is closed by the substrate holder 98 and the cover 96, foreign matters generated at the work site, such as dust, processed powder, and broken pieces, enter the storage chamber 159. Can be prevented. Therefore, it is possible to suppress the visibility of the speed display lamp 157 and the energization lamp 92 from decreasing. The display panel case 141 may be disposed in a path through which cooling air flows. Even in this case, since the operation substrate 91 is closed by the substrate holder 98 and the cover 96 as described above and has good sealing properties, even if dust is sucked into the work machine body 12 together with the cooling air, the operation substrate 91 is accommodated. It is possible to prevent dust from entering the chamber 159 and to suppress the visibility of the display panel case 141 from being lowered.

  Furthermore, since the lead wires 58, 62, 65 connected to the control board 71 are covered with the protective tube 143 and the heat shrinkable tube 145, the lead wires 58, 62, 65 even if the work machine body 12 vibrates. Can avoid contact with surrounding objects, for example, the heat sink 78, and disconnection of the lead wires 58, 62, 65 can be prevented.

  The correspondence between the configuration of the electric working machine 10 of the first embodiment and the configuration of the present invention will be described. The brushless motor 30 corresponds to the motor of the present invention, and the tip tool 11 corresponds to the work tool of the present invention. The electric work machine 10 corresponds to the power work machine of the present invention, the control board 71 corresponds to the control board of the present invention, the board case 82 corresponds to the board case of the present invention, and the work machine body 12 The motor housing 20 corresponds to the housing of the present invention, the axis A1 corresponds to the first axis of the present invention, and the axis B1 corresponds to the second axis of the present invention.

  The elastic bodies 152, 153, and 154 correspond to the elastic body of the present invention, the elastic body 152 corresponds to the first elastic body of the present invention, and the elastic body 153 corresponds to the second elastic body of the present invention. The elastic body 154 corresponds to the third elastic body of the present invention. The intermediate striker 21, the striker 22, and the piston 23 correspond to the striking mechanism of the present invention, the motor housing 20 corresponds to the first housing of the present invention, and the intermediate case 14 corresponds to the second housing of the present invention. To do. The plate portion 83 corresponds to the plate portion of the present invention, the side wall 84 corresponds to the side wall of the present invention, the boss portion 82a corresponds to the boss portion of the present invention, and the output shaft 33 corresponds to the output shaft of the present invention. The resin layer 200 corresponds to the resin layer of the present invention.

(Embodiment 2)
The power working machine in Embodiment 2 of this invention is demonstrated with reference to FIG. 8 and FIG. 1 are different in the arrangement position of the control unit 130 of the electric working machine 10. The electric working machine 10 shown in FIG. 8 uses the control circuit of FIG. The control unit 130 shown in FIG. 8 is disposed between the brushless motor 30 and the bottom cover 17 in a direction along the axis B1. The cover 160 shown in FIG. 3 is not provided in FIG. Further, the control board 71 is arranged in a direction intersecting the axis B1 when the electric work machine 10 is viewed from the front. A recess 164 is provided on the inner surface of the bottom cover 17, and the substrate case 82 is disposed in the recess 164. The plate portion 83 is in contact with the bottom surface of the recess 164.

  Elastic bodies 165 and 166 are provided between the inner peripheral surface of the recess 164 and the side wall 84. The elastic bodies 165 and 166 are arranged at different positions in the direction along the axis A1. The elastic bodies 165 and 166 are disposed on both sides of the substrate case 82 in the direction along the axis A1. The elastic bodies 165 and 166 are interposed between the substrate case 82 and the bottom cover 17. The elastic bodies 165 and 166 are made of the same material as the elastic bodies 152, 153 and 154. The elastic bodies 165 and 166 may be fixed to the substrate case 82 or may be fixed to the inner peripheral surface of the recess 164. Further, an elastic body may be provided between the plate portion 83 and the concave portion 164. In this case, vibration in the direction along the output shaft 33 is transmitted to the control board 71 via the board case 82. Can be suppressed.

  Further, in FIG. 8, the connection substrate 47 is fixed to the stator 31. The magnetic sensors S1 to S3 provided on the connection board 47 detect the magnetic force generated by the permanent magnet 32b of the rotor 32 and output a signal. In FIG. 8, it is also possible to connect the control board 71 and the signal line 75 using the connector, the heat shrinkable tube, and the protective tube shown in FIG.

  In the electric working machine 10 shown in FIG. 8, when the hitting work is performed and the working machine body 12 vibrates in the direction perpendicular to the axis B1, that is, the direction along the axis A1 in FIG. Is reduced. For this reason, it can suppress that the control unit 130 vibrates in the direction along axis A1 of FIG. Furthermore, a resin layer similar to the resin layer 200 of FIG. 3 may be formed in the substrate case 82 shown in FIG. Therefore, the electric working machine 10 of the second embodiment can obtain the same effects as the electric working machine 10 of the first embodiment. The elastic bodies 165 and 166 correspond to the elastic body of the present invention, and the bottom cover 17 corresponds to the housing of the present invention.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the elastic bodies as the vibration suppressing mechanism may be provided separately or may be integrated as a whole. The elastic body in the present invention is a cushioning material that reduces vibration. Further, the elastic body as the vibration suppressing mechanism may be interposed between the substrate case and the motor housing and between the substrate case and the intermediate case. That is, the elastic body may be fixed to the motor housing and the cover of the intermediate case. When the substrate case is fixed to the motor housing, the elastic body fixed to the motor housing contacts the substrate case. When the intermediate case is fixed to the motor housing, the elastic body provided in the intermediate case comes into contact with the substrate case.

  In the electric working machine of the present invention, power is supplied to the brushless motor from a commercial power source, that is, an AC power source. On the other hand, the electric working machine of the present invention includes an electric working machine in which a battery pack as a DC power source is attached to the working machine main body and the electric power of the battery pack is supplied to the brushless motor. The electric working machine of the present invention only needs to operate the tip tool with the power of the electric motor.

  The electric working machine of the present invention includes a hammer drill and a hammer driver that apply rotational force and axial striking force to the tip tool. The electric working machine of the present invention includes an impact driver and an impact drill that apply a rotational force and a striking force in the rotational direction to the tip tool. Furthermore, the electric working machine includes a driver, a drill, a grinder, and a sander that apply only a rotational force to the tip tool. The electric working machine of the present invention includes a hammer and a nailing machine that applies only an axial striking force to the tip tool. The electric working machine of the present invention includes a jigsaw and a saver saw that reciprocate the tip tool. The work tool includes a tool for crushing an object, a driver bit for tightening or loosening a screw member, and a saw blade for cutting the object. The electric motor as a power source includes an induction motor in addition to a brushless motor. Motors as power sources include hydraulic motors and pneumatic motors in addition to electric motors. The power conversion mechanism includes a cam mechanism in addition to the crank mechanism.

  DESCRIPTION OF SYMBOLS 10 ... Electric working machine, 11 ... Tip tool, 12 ... Working machine main body, 14 ... Intermediate case, 17 ... Bottom cover, 20 ... Motor housing, 21 ... Intermediate striker, 22 ... Strike child, 23 ... Piston, 30 ... Brushless Motor 33, output shaft 71, control board 82, substrate case, 83 plate section 82 a boss section 84 side wall 152 153 154 165 166 elastic body A 1 B 1 axis

Claims (12)

A power working machine that operates a work tool in a direction along the first axis with the power of a motor,
A control board for controlling the motor;
A substrate case for accommodating the control substrate;
A housing for supporting the substrate case;
An elastic body interposed between the substrate case and the housing;
Have
The housing is
A first housing containing the motor;
A second housing fixed to the first housing and containing the substrate case;
With
The substrate case is
A plate portion extending in a direction along a second axis intersecting the first axis;
A side wall provided on an outer peripheral edge of the plate portion and extending in a direction along the first axis from the plate portion;
With
The elastic working machine is interposed between the plate portion and the first housing and / or between the side wall and the second housing in a direction along the first axis. .   The power working machine according to claim 1, wherein a resin layer that covers the control board is formed in the board case. The power work machine according to claim 1 or 2, wherein the substrate case is disposed outside the first housing at a side of the motor in a radial direction of the output shaft of the motor. Operates in a direction along the first axis in the power of the motor and the striking mechanism for applying a striking force to the working tool, the are al provided in the housing, any one of claims 1 to 3 Power working machine as described in. The elastic body is disposed between the plate portion and the first housing and between the side wall and the second housing in a direction along the first axis . The power work machine of any one of Claims . In front view including said first axis, said first axis, said second axis as the rotational axis of the output shaft of the motor, are arranged to cross, the power working machine according to claim 5 . The elastic body is in a direction along the first axis,
A first elastic body interposed between the plate portion and the first housing;
A second elastic body interposed between the tip of the side wall and the second housing;
The power working machine according to claim 1, comprising:   The power working machine according to claim 7, wherein the first elastic body is provided over the entire outer surface of the plate portion. A power working machine that operates a work tool with the power of a motor,
A control board for controlling the motor;
A substrate case for accommodating the control substrate;
A housing for supporting the substrate case;
An elastic body interposed between the substrate case and the housing;
Have
The housing includes a first housing that houses the motor,
The substrate case includes a boss portion into which a screw member is inserted for fixing to the first housing,
The elastic working machine is a power working machine having a third elastic body interposed between the boss portion and the substrate case. A power working machine that operates a work tool with the power of a motor,
A control board for controlling the motor;
A substrate case for accommodating the control substrate;
A housing for supporting the substrate case;
An elastic body interposed between the substrate case and the housing;
Have
The housing includes a first housing that houses the motor,
The substrate case includes a boss portion into which a screw member is inserted for fixing to the first housing,
The elastic body is a power working machine having a third elastic body provided at the boss portion . The substrate case includes a boss portion into which a screw member is inserted for fixing to the first housing,
The power working machine according to claim 1 , wherein the elastic body has a third elastic body interposed between the boss portion and the screw member . The housing includes a second housing fixed to the first housing and containing the substrate case,
The power working machine according to claim 10, wherein the elastic body is interposed between the substrate case and the first housing and / or between the substrate case and the second housing .

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