Electrically-driven work machine

Abstract

To provide an electrically-driven work machine that is provided with an auxiliary substrate separately from a control substrate that controls a motor, and that can suppress electrical conduction between the auxiliary substrate and a surrounding conductive member more reliably and easily.SOLUTION: An electrically-driven work machine comprises: a motor; a control substrate that controls the motor; a conductive member electrically connected to the motor or the control substrate; and an auxiliary substrate electrically connected to the control substrate. The auxiliary substrate is one-surface substrate that has wiring patterns with electronic components mounted thereon on a first surface of back and front two surfaces, and has no wiring patterns and electronic components on a second surface, opposite to the first surface. The auxiliary substrate is positioned such that the second surface faces the conductive member.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an electric operating machine having a control board that controls a motor and an auxiliary board. [Background technology]

[0002] Patent Document 1 describes an electric work machine that is provided with a sensor board that detects the rotation of the motor in addition to a control board that controls the motor. The sensor board is attached to the rear end side of the motor so as to be perpendicular to the rotation shaft of the motor, and multiple sensor elements for detecting the rotation position are mounted on the board surface on the motor side of the sensor board.

[0003] The sensor board is a double-sided board, and a plurality of wiring patterns for supplying power to each sensor element and extracting detection signals are provided distributed on the board surface on the motor side and the opposite side to the motor. The sensor board also has a pattern for supplying current to the motor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6972690 Summary of the Invention [Problem to be solved by the invention]

[0005] In an electric operating machine, examples of the auxiliary board provided separately from the control board include, in addition to the above-mentioned sensor board, an operation board on which an operation switch or the like is mounted, a display board on which a display element such as an LED for displaying an operating state is mounted, etc. As described in Patent Document 1, when the auxiliary board is a double-sided board and wiring patterns and electronic components are provided on both sides, it is necessary to position the auxiliary board so that both sides do not come into contact with conductive members, which creates a problem in that the design of the electric operating machine becomes difficult.

[0006] That is, the first surface, which is one of the two surfaces of the auxiliary board, faces the inside of the motor or the outside of the electric work machine, so that the electronic components and wiring patterns on the first surface can be prevented from contacting the surrounding conductive materials. However, the second surface, which is the surface of the board opposite to the first surface, is likely to be arranged opposite the conductive materials inside the electric work machine. If wiring patterns and electronic components are provided on the second surface, they may be conductive to the surrounding conductive materials due to water or dust that has entered from the outside, causing the electric circuits of the auxiliary board and the control board to fail. Therefore, if the auxiliary board is configured as a double-sided board, it is necessary to design it to ensure insulation so that the wiring patterns and electronic components provided on both sides do not come into contact with the surrounding conductive materials and become conductive, which reduces the degree of freedom in design. In addition, since the electric work machine vibrates due to the rotation of the motor, it is possible that the insulation may be reduced due to this vibration.

[0007] One aspect of the present disclosure aims to more reliably and easily prevent electrical conduction between the auxiliary board and surrounding conductive components in an electric work machine that is provided with an auxiliary board separate from a control board that controls a motor. [Means for solving the problem]

[0008] An electric work machine according to one aspect of the present disclosure includes a motor, a control board that controls the motor, a conductive member electrically connected to the motor or the control board, and an auxiliary board electrically connected to the control board.

[0009] The auxiliary board is a single-sided board having a wiring pattern with electronic components mounted on a first surface thereof, and a second surface opposite to the first surface, which has no wiring pattern or electronic components. The auxiliary board is disposed so that the second surface faces the conductive member.

[0010] Thus, in the electric operating machine of the present disclosure, the auxiliary board is a single-sided board, and the second surface of the auxiliary board, which has no wiring pattern or electronic components, is disposed opposite the conductive member. Therefore, unlike when the auxiliary board is configured as a double-sided board, there is no need to arrange the auxiliary board and the conductive members so that the wiring pattern and electronic components on the second surface of the auxiliary board do not come into contact with the conductive members due to water or dust entering from the outside, which simplifies the design work of the electric operating machine.

[0011] In addition, since no wiring pattern or electronic components are provided on the second surface of the auxiliary board, the wiring pattern or electronic components on the second surface will not become conductive to surrounding conductive members due to vibrations of the electric operating machine, and such conduction will not cause damage to the circuits of the auxiliary board or control board, thereby improving the reliability of the electric operating machine. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view illustrating an external appearance of a grease discharging device according to a first embodiment. [Diagram 2] 2 is a central vertical cross-sectional view of the grease discharging device shown in FIG. 1. [Diagram 3] 2 is a perspective view showing a motor, a sensor board, and a current collecting section in the grease dispensing device. FIG. [Figure 4] 4 is a plan view showing the sensor board as viewed from the motor side. FIG. [Diagram 5] 11 is a plan view showing the sensor board as viewed from the opposite side to the motor. FIG. [Figure 6] 4 is a plan view showing a wiring pattern provided on a motor-side substrate surface of the sensor substrate. FIG. [Figure 7] 11 is a plan view showing a state in which electronic components have been removed from the motor-side board surface of the sensor board. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 1. Overview of the embodiment An embodiment may provide an electric operating machine having at least one of the following features 1 to 5.

[0014] Feature 1: Motor. Feature 2: A control board that controls the motor. Feature 3: A conductive member electrically connected to the motor or the control board.

[0015] Feature 4: An auxiliary board electrically connected to the control board. Feature 5: The auxiliary board has a wiring pattern on which electronic components are mounted on a first surface thereof, and a second surface opposite the first surface is a single-sided board that does not have the wiring pattern or the electronic components, and is arranged so that the second surface faces the conductive member.

[0016] In an electric operating machine having at least features 1 to 5, the auxiliary board is a single-sided board, and the second surface of the auxiliary board, which does not have a wiring pattern or electronic components, is disposed facing the conductive member. Therefore, the wiring pattern or electronic components on the second surface of the auxiliary board will not be electrically connected to the conductive member due to water or dust entering from the outside. Therefore, the wiring pattern or electronic components on the second surface of the auxiliary board will not be electrically connected to the conductive member, which will cause the circuits of the auxiliary board or the control board to break down, and the reliability of the electric operating machine can be improved.

[0017] An embodiment may include any one of the following features 6 to 10 in addition to or instead of at least one of the features 1 to 5 above. Feature 6: The motor is a brushless motor.

[0018] Feature 7: A detection element that detects rotation of the motor is mounted as the electronic component on the first surface of the auxiliary board. Feature 8: The detection element is a Hall element that detects the rotation of the motor from a magnetic change that accompanies the rotation of the motor.

[0019] Feature 9: The conductive member is a current collecting portion of a stator winding of the motor, and the auxiliary board is disposed between the conductive member and the motor. Feature 10: On the first surface of the sensor substrate, at positions where the wiring patterns intersect, one of the wiring patterns is cut so that the wiring patterns are not connected to each other, and the cut portion of the wiring pattern is connected to an electronic component mounted on the first surface.

[0020] In some embodiments, any combination of the above-mentioned features 1 to 10 may be used. In some embodiments, any of the above-mentioned features 1 to 10 may be excluded. 2. Specific Exemplary Embodiments The grease dispensing device 1 will be described below as an example of an electric working machine according to an embodiment of the present disclosure.

[0021] As shown in FIGS. 1 and 2, a grease dispensing device 1 of this embodiment is a so-called grease gun configured to dispense grease when a user pulls a trigger 9, and has a housing 2.

[0022] The housing 2 is constructed by assembling left and right housing halves 2a, 2b with a number of screws 3, 3.... A cylindrical motor housing section 4 is formed in the front-rear direction in the vertical center of the housing 2. A grip section 5 is formed in the front-rear direction at the top of the housing 2. A front joint section 6 is formed on the front side of the motor housing section 4. The front end of the grip section 5, which is bent downward, is joined to the front joint section 6. The rear side of the motor housing section 4 forms a rear joint section 7 that rises upward. The rear end of the grip section 5 is joined to the rear joint section 7 to form a loop.

[0023] A trigger switch 8 is housed inside the grip portion 5. The trigger switch 8 is connected to a trigger 9 that protrudes downward. A light 10 using an LED is provided on the front surface of the grip portion 5. An operation panel 70 is provided on the front upper surface of the grip portion 5 for turning the light 10 on and off and setting the amount of grease to be dispensed.

[0024] A lock-on button 12 that can maintain the retracted state of the trigger 9 is provided on the grip portion 5 in front of the trigger 9. A lock-off button 13 that restricts the pulling operation of the trigger 9 is provided below the lock-on button 12 and in front of the trigger 9.

[0025] A battery holding section 14 is formed on the rear side of the rear coupling section 7. A battery pack (e.g., rated voltage 36V) 15 can be slid from above onto the rear side of the battery holding section 14. A terminal block 16 to which the mounted battery pack 15 is electrically connected is provided in the vertical direction within the battery holding section 14.

[0026] A controller 17 is provided vertically inside the battery holding portion 14 in front of the terminal block 16. The controller 17 includes a control board 18 on which electronic components constituting a control circuit such as a microcomputer are mounted. The controller 17 controls the operation of the light 10 and a motor 20 (described later) in response to the user's operation of the trigger 9 or an operation panel 70, and causes a display circuit 72 of the operation panel 70 to display various information.

[0027] A motor 20 is accommodated within the motor housing portion 4. The motor 20 is an inner rotor type brushless motor having a stator 21 and a rotor 22 positioned inside the stator 21.

[0028] Stator 21 has a plurality (six in this embodiment) of stator windings (hereinafter simply referred to as coils) 24, 24... wound around insulators 23A, 23B provided on the front and rear end faces. Rear insulator 23B is provided with terminals (not shown) to which wires forming each coil 24 are fused, and with short-circuit members 25.

[0029] 3, the short-circuit member 25 is formed by insert-molding three short-circuiting metal fittings 26, 26··, to which three-phase power supply lines 27, 27·· are respectively connected, into a short-circuiting member body 25A made of synthetic resin. Each short-circuiting metal fitting 26 has a plurality of connection terminals 28, 28··, protruding from the short-circuiting member body 25A to the periphery, which are connected to the respective terminals of the insulator 23B, thereby connecting the coils 24 of the motor 20 in three phases.

[0030] Further, a sensor board 80 is provided between the insulator 23B and the short-circuit member 25. The sensor board 80 has three Hall elements 84A, 84B, and 84C mounted thereon for detecting the rotational position of the rotor 22, and is connected to a plurality of signal lines 82, 82....

[0031] The power supply line 27 and the signal line 82 are drawn out to the battery holding portion 14 side and connected to the control board 18 of the controller 17. The sensor board 80 corresponds to an example of the auxiliary board of the present disclosure. Details of the sensor board 80 will be described later.

[0032] Next, the rotor 22 of the motor 20 has a rotating shaft 30 at its axis. A plurality of permanent magnets 31, 31... are embedded around the rotating shaft 30. A fan 32 is attached to the front of the rotating shaft 30 in an orthogonal manner.

[0033] A plurality of air intake ports 33, 33... are formed on the left and right side surfaces of the rear coupling portion 7. The air intake ports 33 draw in outside air by the rotation of the fan 32. A plurality of exhaust ports 34, 34... are formed on the left and right side surfaces of the motor housing portion 4. The exhaust ports 34 are located radially outward and in front of the fan 32, and discharge the air drawn into the motor housing portion 4 to the outside.

[0034] The short-circuit member 25 and the sensor board 80 have a hollow disk shape, and the rotating shaft 30 is inserted into the hollow portion. A bearing 35 that supports the rear end of the rotating shaft 30 is provided behind the short-circuit member 25 and in the rear coupling portion 7.

[0035] A gear housing 40 is provided in front of the motor 20. The gear housing 40 is cylindrical, and a bracket plate 41 is attached to the rear end opening. The front end of the rotating shaft 30 penetrates the bracket plate 41 and protrudes into the gear housing 40. The bracket plate 41 holds a bearing 42 that supports the rotating shaft 30.

[0036] A reduction gear mechanism 43 is housed within the gear housing 40. The reduction gear mechanism 43 utilizes planetary gears to reduce the rotation of the rotating shaft 30 in three stages and outputs the rotation to a spindle 44 provided at the front end. A crank housing 45 extending in the vertical direction is provided at the front side of the gear housing 40. The spindle 44 protrudes from the gear housing 40 into the crank housing 45.

[0037] A crank disk 46 is provided integrally with the front end of the spindle 44 inside the crank housing 45. The crank disk 46 is provided with an eccentric pin 47 that protrudes forward. A slider 48 having a long hole 49 in the left-right direction is provided in front of the crank disk 46. The slider 48 is supported within the crank housing 45 so as to be able to move up and down, and the eccentric pin 47 is inserted into the long hole 49. The upper end of a rod-shaped plunger 50 that extends in the vertical direction is connected to the center of the lower end of the slider 48.

[0038] Therefore, when the crank plate 46 rotates together with the spindle 44, the eccentric pin 47 performs eccentric motion. Then, the slider 48 moves up and down due to the vertical stroke of the eccentric pin 47, and the plunger 50 moves up and down integrally therewith.

[0039] A cylindrical front holder 51 is formed at the lower part of the crank housing 45. A rear holder 52 that protrudes downward is provided behind the front holder 51 at the lower part of the motor housing portion 4. The rear holder 52 has front and rear legs 53, 53.

[0040] A tank 54 is supported by the front holder 51 and the rear holder 52. The tank 54 has an open front end and passes through the rear holder 52 from the rear, and the front end is screwed into the rear surface of the front holder 51. In this state, the tank 54 is connected to the front holder 51 in a position extending in the front-rear direction below the motor housing portion 4.

[0041] A rod 55 with a piston 56 at its front end is housed in the tank 54 so as to be movable in the front-rear direction. The rear end of the rod 55 protrudes from the rear end of the tank 54, and a handle 57 is provided thereon. A coil spring 58 is provided behind the piston 56 in the tank 54 to urge the piston 56 forward. A cartridge (not shown) filled with grease is housed in front of the piston 56 in the tank 54. The cartridge is pressed by the piston 56 which moves forward due to the urging of the coil spring 58, and supplies grease into the front holder 51.

[0042] A pump 60 is provided in the front holder 51. The pump 60 discharges grease supplied from the tank 54 under pressure by the up and down movement of the plunger 50. In addition to the plunger 50, the pump 60 includes an upper cylinder portion 61 and a lower cylinder portion 62. The gap between the upper cylinder portion 61 and the lower cylinder portion 62 communicates with the tank 54. A vertical discharge passage 63 is formed in the lower cylinder portion 62. A check valve 64 is provided at the bottom of the vertical discharge passage 63.

[0043] Next, a lateral discharge passage 66 communicating with the vertical discharge passage 63 is formed facing forward in the lower cylinder portion 62. A front cylinder portion 67 protruding forward is formed on the front surface of the front holder 51. The lateral discharge passage 66 is formed in the center of the front cylinder portion 67, and its front end is opened as a grease discharge port 66A. A hose 68 is connected to the front cylinder portion 67 to guide the grease discharged from the discharge port 66A to a desired location.

[0044] A relief valve 69 is provided on the right side of the front cylindrical portion 67. The relief valve 69 releases the grease to the outside when the pressure of the grease in the lateral discharge passage 66 reaches or exceeds a predetermined pressure. In the grease dispensing device 1 configured as described above, when the tank 54 containing the cartridge is connected to the front holder 51 and the user pulls the trigger 9, the control circuit implemented on the control board 18 of the controller 17 drives the motor 20 to rotate the rotating shaft 30.

[0045] That is, the controller 17 detects the rotation state of the rotor 22 based on the detection signals output from the Hall elements 84A, 84B, and 84C of the sensor board 80. Then, the controller 17 causes a three-phase current to flow in turn through each coil 24 in accordance with the detected rotation state of the rotor 22, thereby rotating the rotor 22 (in other words, the rotating shaft 30).

[0046] The rotation of the rotating shaft 30 is reduced in speed by the reduction mechanism 43 and transmitted to the spindle 44, which reduces the speed of rotation of the crank plate 46 together with the spindle 44. This causes the eccentric pin 47 to perform eccentric motion, causing the slider 48 to move up and down, and reciprocating the plunger 50 up and down.

[0047] Then, in the pump 60, the grease that has been forced downward inside the vertical discharge passage 63 of the lower cylinder portion 62 flows into the horizontal discharge passage 66 and is discharged from the discharge port 66A via the hose 68. This discharge operation is repeated as the plunger 50 reciprocates.

[0048] Next, the configuration of a sensor substrate 80 serving as an auxiliary substrate according to the present disclosure will be described with reference to FIGS. 4, the sensor board 80 has a hollow disk shape, and three Hall elements 84A, 84B, and 84C for detecting rotational position are mounted on the board surface (hereinafter referred to as the first surface) on the motor 20 side. Specifically, the Hall elements 84A, 84B, and 84C are provided on the first surface of the sensor board 80 around the rotating shaft 30 of the motor 20 at angular intervals corresponding to an electrical angle of 120 degrees.

[0049] Additionally, on the first surface of the sensor substrate 80, in areas 90A, 90B, 90C where the Hall elements 84A, 84B, 84C are mounted, chip components 85A, 86A, 85B, 86B, 85C, 86C which are bypass capacitors for absorbing noise are also mounted, respectively.

[0050] Each of the Hall elements 84A, 84B, 84C detects the rotational position of the motor 20 from a magnetic change accompanying the rotation of the rotor 22 (specifically, the permanent magnet 31), and outputs a detection signal. That is, a current is supplied to each of the Hall elements 84A, 84B, 84C from the controller 17 via the signal line 82. Then, each of the Hall elements 84A, 84B, 84C generates an electromotive force according to the magnitude of the magnetic field generated by the permanent magnets 31, 31... provided around the rotating shaft 30, and outputs a detection signal according to the electromotive force. As a result, the controller 17 can detect the rotational speed and rotational position of the motor 20 from the detection signal.

[0051] 5, on the other hand, no copper foil or electronic components for forming a wiring pattern are provided on the board surface (hereinafter, the second surface) of sensor board 80 on the side of short-circuit member 25. In other words, sensor board 80 is a single-sided board in which copper foil is provided only on the first surface and the wiring pattern is formed by the copper foil, and no electronic components are attached to the second surface.

[0052] This is because although the short-circuit member 25, which is arranged opposite the second surface of the sensor board 80, has three short-circuit fittings 26, 26... insert-molded therein, the current collecting portion 29 to which the three-phase power lines 27, 27... are connected to each of the short-circuit fittings 26, 26... is exposed.

[0053] In other words, this collecting portion 29 corresponds to an example of a conductive member of the present disclosure, and if a wiring pattern or electronic components are provided on the second surface of the sensor substrate 80, there is a risk that water or dust entering from the outside may cause electrical conductivity between the wiring pattern or electronic components on the second surface and the collecting portion 29.

[0054] Therefore, in this embodiment, the second surface of the sensor substrate 80 is not provided with any wiring patterns or electronic components, and the insulating material that serves as the base material of the sensor substrate 80 is exposed, thereby preventing the occurrence of such problems.

[0055] Next, on the first surface of the sensor substrate 80, for example, a copper foil is etched to form a wiring pattern and pads as shown in FIG. As shown in FIG. 6, a first surface of the sensor substrate 80 is provided with a power supply terminal TV, a ground terminal TG, and output terminals TA, TB, and TC as pads to which the signal lines 82 are connected by soldering or the like.

[0056] Further, on the first surface of the sensor substrate 80, wiring patterns 92V, 92G, 92A, 92B, and 92C are provided which connect these terminal portions TV, TG, TA, TB, and TC to the Hall elements 84A, 84B, and 84C, respectively.

[0057] The power supply terminal unit TV and the ground terminal unit TG are terminal units for passing the above-mentioned current by applying the power supply voltage output from the control board 18 of the controller 17 via the signal line 82 to each of the Hall elements 84A, 84B, and 84C.

[0058] Further, on the first surface of the sensor substrate 80, there are provided a power supply wiring pattern 92V and a ground wiring pattern 92G which connect the power supply terminal portion TV and the ground terminal portion TG to the power supply electrodes and ground electrodes of each of the Hall elements 84A, 84B, 84C, respectively.

[0059] The output terminals TA, TB, and TC are terminals for outputting detection signals from the Hall elements 84A, 84B, and 84C to the control board 18 of the controller 17 via the signal line 82.

[0060] Further, on the first surface of the sensor substrate 80, output wiring patterns 92A, 92B, and 92C are provided which connect the output terminal portions TA, TB, and TC to the output electrodes of the Hall elements 84A, 84B, and 84C, respectively.

[0061] The power supply wiring pattern 92V and the ground wiring pattern 92G are wiring patterns common to the Hall elements 84A, 84B, and 84C, and the output wiring patterns 92A, 92B, and 92C are wiring patterns dedicated to each of the Hall elements 84A, 84B, and 84C.

[0062] For this reason, when wiring patterns are formed on only one side of the sensor substrate 80 as in this embodiment, different wiring patterns need to cross each other. For example, in the sensor substrate 80 of this embodiment, as shown in Fig. 6, in an area 97, the output wiring pattern 92A and the power supply wiring pattern 92V need to cross each other. Similarly, in an area 98, the power supply wiring pattern 92V and the output wiring pattern 92C need to cross each other, and in an area 99, the ground wiring pattern 92G and the power supply wiring pattern 92V need to cross each other.

[0063] Therefore, in this embodiment, in each of these regions 97, 98, 99, one of the wiring patterns is cut so that the wiring patterns are not conductive to each other, and pads are formed on both ends of the cut portion for surface mounting of connecting chip components.

[0064] Specifically, in an area 97, the power supply wiring pattern 92V is cut, in an area 98, the output wiring pattern 92C of the Hall element 84C is cut, and in an area 99, the power supply wiring pattern 92V is cut.

[0065] The wiring patterns cut in the regions 97, 98, and 99 are connected to connecting chip components (for example, jumper resistors) 87, 88, and 89 mounted on the first surface of the sensor substrate 80, as shown in FIG.

[0066] 7, a protective resist 100 is applied onto the wiring patterns on the first surface of the sensor substrate 80. The resist 100 has openings at the terminal portions TV, TG, TA, TB, TC and at pad portions of the wiring patterns 92V, 92G, 92A, 92B, 92C to which chip components such as Hall elements 84A, 84B, 84C are soldered.

[0067] The above-mentioned Hall elements 84A, 84B, and 84C and chip components 85A, 86A, 85B, 86B, 85C, 86C, 87, 88, and 89 are soldered to the pad portions of the above-mentioned respective areas 90A, 90B, 90C, 97, 98, and 99.

[0068] As described above, in the grease dispensing device 1 of this embodiment, a short-circuit member 25 is provided on the rear end side of the motor 20, in which short-circuiting fittings 26, 26... are insert-molded to be connected to each coil 24 of the motor 20, sandwiching the sensor board 80 therebetween.

[0069] In this short-circuit member 25, power lines 27, 27... are connected to the short-circuiting metal fittings 26, 26..., thereby supplying power to the coils 24, 24... of each phase of the motor 20. A current collecting portion 29 to which the short-circuiting metal fittings 26, 26... and the power lines 27, 27... are connected is exposed as a conductive member.

[0070] In contrast, in this embodiment, the sensor board 80 is configured as a single-sided board in which copper foil for forming a wiring pattern is provided only on one side, and the second side of the sensor board 80 facing the short-circuit member 25 is a board surface without copper foil, and no wiring pattern or electronic components are provided thereon. In other words, in the sensor board 80, wiring patterns and pads are provided by etching the copper foil or the like only on the first side opposite the short-circuit member 25, and electronic components such as Hall elements 84A, 84B, and 84C are surface-mounted.

[0071] Therefore, according to the grease dispensing device 1 of this embodiment, even if water or dust from the outside enters the gap between the second surface of the sensor board 80 and the short-circuit member 25, the electrical circuit of the sensor board 80 will not be conductive to the current collecting portion 29 of the short-circuit member 25.

[0072] Therefore, the sensor board 80 and the control board 18 or the controller 17 electrically connected to the sensor board 80 will not break down due to the electrical circuit of the sensor board 80 being electrically connected to the current collecting portion 29 of the short-circuit member 25. This improves the reliability of the grease dispensing device 1.

[0073] In addition, a single-sided substrate is used for the sensor substrate 80, and a wiring pattern only needs to be provided on the first surface, eliminating the need for design to ensure insulation of wiring patterns and electronic components that are required when the second surface is provided. Therefore, the sensor substrate 80 of this embodiment simplifies the design work and can be realized at low cost.

[0074] In this embodiment, three Hall elements 84A, 84B, and 84C are mounted on the first surface of the sensor board 80 as detection elements for detecting the rotation of the motor 20. For this reason, the wiring pattern provided on the first surface of the sensor board 80 needs to connect the three electrodes of each Hall element to the terminals TV, TG, TA, TB, and TC connected to the control board 18 of the controller 17. Therefore, unlike when a double-sided board is used as the sensor board 80, wiring using through holes cannot be performed, making it difficult to design the wiring pattern.

[0075] However, in this embodiment, because chip components 87, 88, and 89 are used for part of the wiring pattern, designing the wiring pattern is not more difficult than when a double-sided board is used. Therefore, by configuring sensor board 80 as a single-sided board, the cost required for designing sensor board 80 does not increase, and as described above, sensor board 80 can be realized at low cost.

[0076] Furthermore, in electric operating machines, the substrate may be coated to make it waterproof and dustproof, but if the substrate is constructed as a single-sided substrate and electronic components are provided only on the copper foil side, as in the case of sensor substrate 80 of this embodiment, coating only needs to be applied to one side. Therefore, with sensor substrate 80 of this embodiment, the coating area can be halved compared to when both sides of the substrate are coated, and manufacturing costs due to coating can also be reduced.

[0077] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above-described embodiment and can be implemented in various modified forms. In the above embodiment, the grease discharge device 1 was used as an example of an electric work machine, but the present disclosure can be applied in the same manner as the above embodiment to any electric work machine that has a motor 20 as a power source and has a control board and an auxiliary board that control the motor 20.

[0078] In the above embodiment, the sensor board 80 attached to the motor 20 is used as an example of an auxiliary board electrically connected to the control board, but the auxiliary board of the present disclosure is not limited to a sensor board as long as it is a board electrically connected to the control board. For example, the auxiliary board may be an operation board on which an operation switch or the like is mounted, or a display board on which a display element such as an LED is mounted, etc.

[0079] In the above embodiment, the second surface of the sensor board 80 serving as the auxiliary board has been described as being disposed opposite the current collecting portion 29 of the short-circuit member 25 to which the power supply lines 27, 27·· are connected to the short-circuit metal fittings 26, 26··.

[0080] However, even if the auxiliary substrate of the present disclosure is arranged opposite a conductive member other than the current collecting portion 29 of the short-circuit member 25, the same effect as in the above embodiment can be obtained by making it a single-sided substrate having no wiring pattern or electronic components on the second surface facing the conductive member.

[0081] For example, the second surface of the auxiliary board may be disposed so as to face the core of the stator 21 of the motor 20, or may be disposed so as to face the speed reduction mechanism 43 that reduces the rotation speed of the rotating shaft 30 of the motor 20. In addition, the second surface of the auxiliary board may be disposed so as to face a conductive wall surface within the housing of the electric operating machine.

[0082] A plurality of functions possessed by one component in the above embodiments may be realized by a plurality of components, or a single function possessed by one component may be realized by a plurality of components. A plurality of functions possessed by a plurality of components may be realized by a single component, or a single function realized by a plurality of components may be realized by a single component. A part of the configuration of the above embodiments may be omitted. At least a part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0083] 18...control board, 20...motor, 80...sensor board, 84A to 84C...hall elements, 85A to 85C, 86A to 86C, 87, 88, 89...chip components.

Claims

1. A motor; A control board for controlling the motor; A conductive member electrically connected to the motor or the control board; an auxiliary board electrically connected to the control board; Equipped with The auxiliary board has a wiring pattern with electronic components mounted on a first surface thereof, and a second surface opposite the first surface is a single-sided board lacking the wiring pattern and electronic components, and is arranged so that the second surface faces the conductive member.

2. The electric operating machine according to claim 1 , wherein the motor is a brushless motor.

3. The electric operating machine according to claim 1 , wherein a detection element that detects rotation of the motor is mounted as the electronic component on the first surface of the auxiliary board.

4. 4. The electric operating machine according to claim 3, wherein the detection element is a Hall element that detects rotation of the motor from a magnetic change that accompanies rotation of the motor.

5. 2. The electric operating machine according to claim 1, wherein the conductive member is a current collecting portion of a stator winding of the motor, and the auxiliary board is disposed between the conductive member and the motor.

6. An electric operating machine as described in any one of claims 1 to 5, wherein, on the first surface of the auxiliary board, at a position where the wiring patterns intersect with each other, one of the wiring patterns is cut so that the wiring patterns are not connected to each other, and the cut portion of the wiring pattern is connected to the electronic component mounted on the first surface.

Images