Working machine

Abstract

To provide a compact work machine.SOLUTION: A work machine has a motor 3 and a gear box 5. The gear box 5 has an opening on a rear end, and a motor spacer 80 is connected to the opening. The motor spacer 80 has a recessed part 81 on a back surface. A sensor substrate 90 is positioned by the recessed part 81, and the sensor substrate 90 is connected to the recessed part 81. The sensor substrate 90 detects a rotation state of the motor 3. Anteroposterior positions of the sensor substrate 90 and the gear box 5 are overlapped.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] Patent Document 1 discloses a power tool in which a substrate is disposed in a motor housing.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a working machine such as a power tool, improvement in workability by downsizing is required.

[0005] An object of the present invention is to provide a compact working machine.

Means for Solving the Problems

[0006] One aspect of the present invention is a working machine. This working machine includes a motor, a gearbox having a motor-side opening that opens to the motor side, a lid connected to the motor-side opening, Front a sensor board for detecting the rotational state of the motor, and has in the axial direction of the motor, the The above-mentioned existence range of the sensor board, or an element, solder, or screw head mounted on the sensor board overlaps with the rear part of the gearbox and the lid.

[0007] Another aspect of the present invention is a working machine. This working machine includes having a motor and a gearbox The gearbox has an opening on the motor side A lid is connected to the opening on the motor side Within the range where a sensor substrate for detecting the rotational state of the motor exists in the axial direction of the motor, the lid extends outward in the radial direction of the motor with respect to the sensor substrate. Detecting the rotational state of the motor in the axial direction of the motor The above-mentioned sensor group The plate the lid fits within the existing range .

[0008] In addition, any combination of the above components and those obtained by converting the expression of the present invention among methods, systems, etc. are also effective as aspects of the present invention

Effects of the Invention

[0009] According to the present invention, a compact working machine can be provided

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

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Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0011] Hereinafter, the same or equivalent components, members, etc. shown in each drawing are denoted by the same reference numerals, and repeated explanations are omitted as appropriate. The embodiments are illustrative and not restrictive of the invention. Not all features and combinations thereof described in the embodiments are necessarily essential to the invention.

[0012] (Embodiment 1) FIGS. 1 to 3 relate to the working machine 1 according to Embodiment 1 of the present invention. With reference to FIG. 1, the front-rear and vertical directions orthogonal to each other in the working machine 1 are defined. The direction perpendicular to the front-rear and vertical directions is defined as the left-right direction. The front-rear direction is parallel to the axial direction of the motor 3. The working machine 1 is a driver drill. The working machine 1 includes a housing 2.

[0013] The housing 2 includes a motor housing (body part) 2a, a handle housing (handle part) 2b, and a battery housing (battery attachment / detachment part) 2c. The motor housing 2a, the handle housing 2b, and the battery housing 2c are resin molded bodies having a left-right two-part structure.

[0014] The motor housing 2a is a cylindrical part whose central axis is substantially parallel to the front-rear direction. Air inlets 2j are provided on both left and right side surfaces of the motor housing 2a. A clutch dial 10, a sleeve 11, and a chuck part 23 are provided in front of the motor housing 2a. The chuck part 23 holds a tip tool such as a bit (not shown).

[0015] The housing 2 has a tail cover 12 that covers the rear end opening of the motor housing 2a. The tail cover 12 is made of a single resin molded body. Exhaust ports 12a are provided on both left and right sides of the tail cover 12. The exhaust port 12a may be a partial gap between the motor housing 2a.

[0016] The handle housing 2b has one end (upper end) connected to the middle part in the front - rear direction of the motor housing 2a and extends downward from the middle part. At the upper end part of the handle housing 2b, a trigger switch (operation switch) 6 for the user to switch the drive and stop of the motor 3 is provided.

[0017] The battery housing 2c is provided at the other end (lower end) of the handle housing 2b, and the battery pack 7 can be detachably mounted. The working machine 1 operates with the power of the battery pack 7. As shown in FIG. 2(B), the working machine 1 has a control board 20 inside the battery housing 2c.

[0018] As shown in FIG. 2(A), the working machine 1 has a motor 3, a speed - reduction mechanism 4, a gear box (front case) 5, a motor spacer 8, a sensor board 9, and a fan 17 inside the motor housing 2a and the tail cover 12.

[0019] The motor 3 is an inner - rotor type brushless motor and has a rotor assembly 3b and a stator assembly 3c as shown in FIG. 3. The energization of the motor 3 is controlled by a controller (microcomputer) and a switching element (inverter circuit) provided on the control board 20 shown in FIG. 2(B).

[0020] The speed - reduction mechanism 4 is held inside the gear box 5 in front of the motor 3, reduces the rotation of the motor 3, and transmits it to the chuck part 23. The gear box 5 is made of, for example, metal and has a cylindrical shape with an open rear end. A rear case 19 is provided inside the rear part of the gear box 5.

[0021] As shown in FIG. 3, the fan 17 is directly connected to the rear portion of the output shaft 3a of the motor 3 and is located within the tail cover 12. The fan 17 is a centrifugal fan driven by the motor 3, and generates cooling air for cooling the motor 3 and the like.

[0022] Due to the rotation of the fan 17, the air outside the housing 2 is taken into (suctioned into) the motor housing 2a through the intake port 2j on the side surface of the motor housing 2a, flows rearward while cooling the motor 3, is sucked into the fan 17, flows in the centrifugal direction, and is exhausted (discharged) from the exhaust port 12a.

[0023] The output shaft 3a of the motor 3 is parallel to the front-rear direction. The rear portion of the output shaft 3a is rotatably supported by the rear bearing 13. The rear bearing 13 is held by the tail cover 12. The front portion of the output shaft 3a is rotatably supported by the front bearing 14. The front bearing 14 is held by the motor spacer 8.

[0024] The motor spacer 8 is a lid that is connected to the rear end opening (motor side opening) of the gearbox 5 and closes the opening. The motor spacer 8 is, for example, a resin molded body, and is fixed to the rear end portion of the gearbox 5, for example, by rotational fitting. The rotational fitting rotates the motor spacer 8 with respect to the gearbox 5 in an aligned state and fits it in the rotational direction. The front-rear direction positions of the gearbox 5 and the motor spacer 8 overlap at least partially.

[0025] The sensor board 9 is a board for detecting the rotational position of the rotor assembly 3b (detecting the rotational state of the motor 3), and mounts a magnetic sensor such as a Hall IC (not shown) on the back surface (rear surface). The sensor board 9 is fixed to the insulator 15 for insulating the stator assembly 3c with screws 16. The sensor board 9 is located between the rotor assembly 3b and the stator assembly 3c, and the motor spacer 8. The sensor board 9 needs to be separated from the rotor assembly 3b by a certain distance or more in the front-rear direction.

[0026] The front-rear direction positions of the elements 18 such as resistance elements provided on the front surface of the sensor substrate 9, solder (not shown), and the heads of the screws 16 overlap with the rear part of the gear box 5 and the motor spacer 8. The front-rear direction positions of the sensor substrate 9 and the motor spacer 8 overlap at least partially. The front-rear direction positions of the sensor substrate 9 and the front bearing 14 overlap at least partially.

[0027] According to the present embodiment, the following effects can be achieved.

[0028] (1) Since the front-rear direction positions of the elements 18 provided on the front surface of the sensor substrate 9, solder (not shown), and the heads of the screws 16 overlap with the rear part of the gear box 5 and the motor spacer 8, compared with the case where they are not overlapped, the size of the motor housing 2a in the front-rear direction can be reduced, and a compact working machine 1 can be realized.

[0029] (2) Since the front-rear direction positions of the gear box 5 and the motor spacer 8 overlap at least partially, compared with the case where the motor spacer 8 is located behind the gear box 5 without overlap, the size of the motor housing 2a in the front-rear direction can be reduced, and a compact working machine 1 can be realized.

[0030] (3) Since the front-rear direction positions of the sensor substrate 9 and the motor spacer 8 overlap at least partially, compared with the case where the sensor substrate 9 is located behind the motor spacer 8 without overlap, the size of the motor housing 2a in the front-rear direction can be reduced, and a compact working machine 1 can be realized.

[0031] (4) Since the front-rear direction positions of the sensor substrate 9 and the front bearing 14 overlap at least partially, compared with the case where the sensor substrate 9 is located behind the front bearing 14 without overlap, the size of the motor housing 2a in the front-rear direction can be reduced, and a compact working machine 1 can be realized.

[0032] (Embodiment 2) Figures 4 to 10 relate to the working machine according to Embodiment 2 of the present invention. The main difference from Embodiment 1 is that the motor spacer 8 is replaced by a motor spacer 80, and the sensor substrate 9 is replaced by a sensor substrate 90.

[0033] The motor spacer 80 is, for example, a resin molded body and is a lid that is connected to the rear end opening (motor side opening) of the gear box 5 to close the opening. The motor spacer 80 is fixed to the rear end portion of the gear box 5, for example, by rotational fitting. The front-rear direction positions of the gear box 5 and the motor spacer 80 overlap at least in part. The motor spacer 80 has a bearing holding portion 82 for holding the front bearing 14 at the central portion on the back side. The motor spacer 80 has a recess 81 on the back surface. The recess 81 is located radially outside the bearing holding portion 82.

[0034] The sensor substrate 90 is a substrate on which a magnetic sensor such as a Hall IC for detecting the rotational position of the rotor assembly 3b is mounted on the back surface. The sensor substrate 90 is located in the recess 81 and is positioned by the recess 81. The sensor substrate 90 is connected (fixed) to the recess 81, for example, by heat caulking (heat welding) without screwing. The heat caulking portion (joint portion) 91 is the joint location of the sensor substrate 90 with respect to the motor spacer 80. The fixing of the sensor substrate 90 to the motor spacer 80 may also be by rotational fitting, adhesion, or screwing.

[0035] The thickness of the sensor substrate 90 is within the depth of the recess 81, and the sensor substrate 90 does not protrude rearward from the opening of the recess 81. That is, the sensor substrate 90 is accommodated within the range of existence of the motor spacer 80 in the front-rear direction. The front-rear direction positions of the sensor substrate 90 and the gear box 5 overlap at least in part. The front-rear direction positions of the sensor substrate 90 and the front bearing 14 overlap at least in part.

[0036] The insulator 15A is a member corresponding to the insulator 15 of Embodiment 1. However, unlike the insulator 15, since it is not necessary to fix the sensor substrate, there are no extension parts or screw seats for fixing the sensor substrate, and the structure is simple.

[0037] As shown in Fig. 8, the assembly procedure is as follows: Prepare a set of a motor spacer 80 to which a front bearing 14 and a sensor board 90 are fixed, a gear box 5 and its internal components (such as a speed reduction mechanism 4), and press-fit the output shaft 3a of the motor 3 into the front bearing 14.

[0038] Other aspects of this embodiment are the same as those of Embodiment 1.

[0039] According to this embodiment, since the sensor board 90 is arranged in the recess 81 of the motor spacer 80, the sensor board 90 is arranged closer to the front compared to the sensor board 9 of Embodiment 1. Therefore, the motor 3 can be moved forward by that amount, and the size of the motor housing 2a in the front-rear direction can be further reduced compared to Embodiment 1, realizing a compact working machine.

[0040] In addition, since the sensor board 90 is positioned by the recess 81, positioning and attachment of the sensor board 90 are easier compared to the case of screwing the sensor board 90 to the insulator 15A, and miniaturization of the insulator 15A and thereby miniaturization of the motor housing 2a are also possible.

[0041] (Embodiment 3) Figs. 11 to 13 relate to a working machine 101 according to Embodiment 3 of the present invention. In Fig. 11, the front-rear and vertical directions orthogonal to each other in the working machine 101 are defined. A direction perpendicular to the front-rear and vertical directions is defined as the left-right direction. The working machine 101 is an impact driver. The working machine 101 includes a housing 102.

[0042] The housing 102 includes a motor housing (body part) 102a, a handle housing (handle part) 102b, and a battery housing (battery attachment / detachment part) 102c. The motor housing 102a, the handle housing 102b, and the battery housing 102c are resin molded bodies having a left-right two-part structure.

[0043] The motor housing 102a is a cylindrical part whose central axis is substantially parallel to the front-rear direction. A tip tool such as a bit (not shown) is held at the front end of the motor housing 102a. The housing 102 has a tail cover 112 that covers the rear end opening of the motor housing 102a. The tail cover 112 is made of a single resin molded body.

[0044] The handle housing 102b has one end (upper end) connected to the middle part in the front-rear direction of the motor housing 102a and extending downward from the middle part. A trigger switch (operation switch) 106 for the user to switch the drive and stop of the motor 103 is provided at the upper end of the handle housing 102b.

[0045] The battery housing 102c is provided at the other end (lower end) of the handle housing 102b, and the battery pack 107 can be detachably mounted. The working machine 101 operates with the power of the battery pack 107.

[0046] As shown in FIG. 12, the working machine 101 has a motor 103, a speed reduction mechanism 104, a gear box (front case) 105, a rotary impact mechanism 125, a rear case 180, a sensor board 190, and a fan 117 inside the motor housing 102a and the tail cover 112.

[0047] The motor 103 is an inner rotor type brushless motor. The speed reduction mechanism 104 is held inside the gear box 105 in front of the motor 103, reduces the rotation of the motor 103, and transmits it to the rotary impact mechanism 125. The rotary impact mechanism 125 applies a rotary impact force to a tip tool (not shown). The gear box 105 is made of, for example, metal and has a cylindrical shape with an open rear end.

[0048] The fan 117 is directly connected to the rear part of the output shaft 103a of the motor 103 and is located inside the tail cover 112. The fan 117 is a centrifugal fan driven by the motor 103 and generates cooling air for cooling the motor 103 and the like.

[0049] The output shaft 103a of the motor 103 is parallel to the front-rear direction. The rear portion of the output shaft 103a is rotatably supported by the rear bearing 113. The rear bearing 113 is held by the tail cover 112. The front portion of the output shaft 103a is rotatably supported by the front bearing 114. The front bearing 114 is held by the rear case 180.

[0050] The rear case 180 is a lid that is connected to the rear end opening (motor side opening) of the gear box 105 and closes the opening. The rear case 180 is, for example, a resin molded body and is fixed to the rear end portion of the gear box 105 by, for example, rotational fitting. The front-rear direction positions of the gear box 105 and the rear case 180 overlap at least partially.

[0051] The rear case 180 has a recess 181 on its back surface. The recess 181 is located radially outside the front bearing 114. The sensor substrate 190 is located within the recess 181 and is positioned by the recess 181. The sensor substrate 190 is joined (fixed) to the rear case 180, for example, by heat caulking. The fixing of the sensor substrate 190 to the rear case 180 may also be by rotational fitting, adhesion, or screwing.

[0052] The thickness of the sensor substrate 190 is within the depth of the recess 181, and the sensor substrate 190 does not protrude rearward from the opening of the recess 181. That is, the sensor substrate 190 is accommodated within the range of existence of the rear case 180 in the front-rear direction. The front-rear direction positions of the sensor substrate 190 and the front bearing 114 overlap at least partially.

[0053] According to the present embodiment, similar to Embodiment 2, a compact working machine can be realized.

[0054] As described above, the present invention has been described by taking the embodiments as examples, but it is understood by those skilled in the art that various modifications are possible within the scope described in the claims for each component and each processing process of the embodiments.

Explanation of Reference Numerals

[0055] 1... Working machine, 2... Housing, 2a... Motor housing (body part), 2b... Handle housing (handle part), 2c... Battery housing (battery attachment / detachment part), 2j... Air inlet, 3... Motor, 3a... Output shaft, 3b... Rotor assembly, 3c... Stator assembly, 4... Reduction mechanism, 5... Gearbox (front case), 6... Trigger switch, 7... Battery pack, 8... Motor spacer (cover), 9... Sensor board, 10... Clutch dial, 11... Sleeve, 12... Tail cover, 12a... Exhaust port, 13... Rear bearing, 14... Front bearing, 15, 15A... Insulator, 16... Screw, 17... Fan, 18... Element, 19... Rear case, 20... Control board, 23... Chuck part, 80... Motor spacer (cover), 81... Recess, 82... Bearing holding part, 90... Sensor board, 91... Thermo-compression part (joint part), 101... Working machine, 102... Housing, 102a... Motor housing (body part), 102b... Handle housing (handle part), 102c... Battery housing (battery attachment / detachment part), 103... Motor, 103a... Output shaft, 104... Reduction mechanism, 105... Gearbox, 106... Trigger switch, 107... Battery pack, 112... Tail cover, 113... Rear bearing, 114... Front bearing, 117... Fan, 125... Rotary impact mechanism, 180... Motor spacer (cover), 190... Sensor board.

Claims

1. A motor, a gearbox having a motor-side opening that opens to the motor side, a lid connected to the motor-side opening, a sensor board for detecting the rotational state of the motor, and having, in the axial direction of the motor, the range of presence of the sensor board, or elements, solder, or the heads of screws mounted on the sensor board, overlaps with the rear part of the gearbox and the lid, A working machine characterized by this.

2. The motor has a rotor assembly and a stator assembly, The sensor board is fixed to an insulator for insulation provided in the stator assembly, The working machine according to claim 1, characterized by this.

3. The sensor board is connected to the lid, the working machine according to claim 1.

4. The lid is provided with a recess for connecting the sensor board, the working machine according to claim 1.

5. The lid has a bearing holding part for holding a bearing, The recess is located radially outside the bearing holding part, the working machine according to claim 4.

6. The sensor board is connected to the lid without using screws, the working machine according to claim 1.

7. The sensor board is positioned by the lid, the working machine according to claim 1.

8. Having a fan that generates cooling air, The gearbox is arranged in front of the motor, The fan is arranged behind the motor, the working machine according to claim 1.

9. The lid has a heat caulking part for fixing the sensor board, and the sensor board is connected to the lid by the heat caulking part, the working machine according to claim 6.

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