JP7705026B2 - Work Machine - Google Patents

Description

The present invention relates to a work machine.

Patent document 1 discloses an electric power tool in which a circuit board is arranged in a motor housing.

JP 2015-180523 A

There is a demand for power tools and other work machines to be made more compact and easier to use.

The object of the present invention is to provide a compact work machine.

One aspect of the present invention is a work machine.
A motor;
a gear box having a motor side opening that opens to the motor side;
A cover body connected to the motor side opening;
a sensor board for detecting a rotation state of the motor ;
having
In the axial direction of the motor, the range in which the sensor board or an element, solder or screw head mounted on the sensor board exists overlaps with the rear of the gear box and the cover.

Another aspect of the present invention is a work machine.
A motor and a gear box,
The gear box has a motor side opening,
A cover is connected to the motor side opening,
the cover extends outward in a radial direction of the motor from a sensor substrate that detects a rotation state of the motor within an axial range of the motor,
In the axial direction of the motor, the sensor board that detects the rotation state of the motor is within the range in which the cover is present .

In addition, any combination of the above components, and conversions of the present invention between methods, systems, etc., are also valid aspects of the present invention.

The present invention provides a compact work machine.

FIG. 1 is a right side view of a work machine 1 according to a first embodiment of the present invention. 1A is a right-side cross-sectional view of a portion of the working machine 1. FIG. FIG. 2B is an enlarged view of a portion of FIG. FIG. 6 is an enlarged right side cross-sectional view of a portion of a work machine according to a second embodiment of the present invention. 5 is a cross-sectional view taken along the line CC of FIG. 4 . FIG. 11 is a rear perspective view of a portion of a working machine according to a second embodiment with a right portion of a housing removed. The right side view. FIG. 7 is a rear perspective view of the state in which the housing 2, the motor 3, etc. are removed from FIG. 6. The right side view. 9 is a rear perspective view of the working machine in the same state as in FIG. 8, as viewed from a different viewpoint than in FIG. 8. FIG. 11 is a right side view of a work machine 101 according to a third embodiment of the present invention. FIG. 2 is a right-side cross-sectional view of a portion of the work machine 101. FIG. 14 is an enlarged view of a portion of FIG. 13 .

In the following, identical or equivalent components, parts, etc. shown in each drawing are given the same reference numerals, and duplicated explanations are omitted as appropriate. The embodiments do not limit the invention but are illustrative. All features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(Embodiment 1)
1 to 3 relate to a work machine 1 according to a first embodiment of the present invention. Fig. 1 defines the front-rear and up-down directions of the work machine 1, which are perpendicular to each other. The direction perpendicular to the front-rear and up-down directions is defined as the left-right direction. The front-rear direction is a direction parallel to the axial direction of a motor 3. The work machine 1 is a driver drill. The work machine 1 includes a housing 2.

The housing 2 includes a motor housing (body section) 2a, a handle housing (handle section) 2b, and a battery housing (battery attachment/detachment section) 2c. The motor housing 2a, the handle housing 2b, and the battery housing 2c are resin molded bodies with a two-part structure divided into left and right sections.

The motor housing 2a is a cylindrical part whose central axis is approximately parallel to the front-rear direction. An intake port 2j is provided on each of the left and right side surfaces of the motor housing 2a. A clutch dial 10, a sleeve 11, and a chuck portion 23 are provided in front of the motor housing 2a. The chuck portion 23 holds a tool tip such as a bit (not shown).

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 the left and right sides of the tail cover 12. The exhaust ports 12a may be partial gaps between the tail cover 12 and the motor housing 2a.

The handle housing 2b has one end (upper end) connected to the middle part of the motor housing 2a in the front-rear direction and extends downward from said middle part. A trigger switch (operation switch) 6 that allows the user to switch the motor 3 on and off is provided at the upper end of the handle housing 2b.

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 attached. The work machine 1 operates using power from the battery pack 7. As shown in FIG. 2(B), the work machine 1 has a control board 20 inside the battery housing 2c.

As shown in FIG. 2(A), the work machine 1 has a motor 3, a reduction gear 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.

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 power supply to the motor 3 is controlled by a controller (microcomputer) and switching elements (inverter circuits) provided on the control board 20 shown in FIG. 2(B).

The reduction mechanism 4 is held in the gear box 5 in front of the motor 3, and reduces the rotation of the motor 3 before transmitting it to the chuck portion 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.

As shown in FIG. 3, the fan 17 is directly connected to the rear of the output shaft 3a of the motor 3 and is located inside the tail cover 12. The fan 17 is a centrifugal fan driven by the motor 3, and generates cooling air to cool the motor 3 and other components.

When the fan 17 rotates, air outside the housing 2 is taken in (sucked in) through the intake port 2j on the side of the motor housing 2a, flows backward 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.

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

The motor spacer 8 is a cover that is connected to the rear end opening (motor side opening) of the gearbox 5 to close said opening. The motor spacer 8 is, for example, a resin molded body, and is fixed to the rear end of the gearbox 5, for example, by rotational engagement. The rotational engagement involves rotating the motor spacer 8 in an aligned state relative to the gearbox 5 to engage with it in the rotational direction. The fore-aft positions of the gearbox 5 and the motor spacer 8 overlap at least in part.

The sensor board 9 is a board for detecting the rotational position of the rotor group 3b (detecting the rotational state of the motor 3), and is equipped with a magnetic sensor such as a Hall IC (not shown) on its rear surface. The sensor board 9 is fixed to an insulator 15 for insulating the stator group 3c with screws 16. The sensor board 9 is located between the rotor group 3b and the stator group 3c and the motor spacer 8. The sensor board 9 needs to be spaced at least a certain distance from the rotor group 3b in the front-to-rear direction.

The front-to-rear positions of elements 18 such as resistor elements provided on the front surface of the sensor board 9, solder (not shown), and heads of screws 16 overlap with the rear of the gear box 5 and the motor spacer 8. The front-to-rear positions of the sensor board 9 and the motor spacer 8 overlap at least in part. The front-to-rear positions of the sensor board 9 and the front bearing 14 overlap at least in part.

This embodiment can provide the following advantages:

(1) The front-to-rear position of the element 18 provided on the front surface of the sensor board 9, the solder (not shown), and the head of the screw 16 overlap with the rear of the gear box 5 and the motor spacer 8. This allows the front-to-rear size of the motor housing 2a to be reduced compared to when there is no overlap, resulting in a compact work machine 1.

(2) Because the gearbox 5 and the motor spacer 8 overlap at least partially in the fore-and-aft direction, the size of the motor housing 2a in the fore-and-aft direction can be reduced compared to a case in which the motor spacer 8 is located behind the gearbox 5 without overlap, and a compact work machine 1 can be realized.

(3) Because the sensor board 9 and the motor spacer 8 overlap at least partially in the fore-and-aft direction, the size of the motor housing 2a in the fore-and-aft direction can be reduced compared to a case in which the sensor board 9 is located behind the motor spacer 8 without overlap, and a compact work machine 1 can be realized.

(4) Because the sensor board 9 and the front bearing 14 overlap at least partially in the fore-and-aft direction, the size of the motor housing 2a in the fore-and-aft direction can be reduced compared to a case in which the sensor board 9 is located behind the front bearing 14 without overlap, and a compact work machine 1 can be realized.

(Embodiment 2)
4 to 10 relate to a work machine according to a second embodiment of the present invention. The main differences from the first embodiment are that the motor spacer 8 is replaced by a motor spacer 80, and the sensor board 9 is replaced by a sensor board 90.

The motor spacer 80 is, for example, a resin molded body, and is a cover body that is connected to the rear end opening (motor side opening) of the gearbox 5 to close the opening. The motor spacer 80 is fixed to the rear end of the gearbox 5, for example, by rotational fitting. The gearbox 5 and the motor spacer 80 overlap at least partially in the front-rear direction. The motor spacer 80 has a bearing holding portion 82 in the center of the rear side that holds the front bearing 14. The motor spacer 80 has a recess 81 on the rear side. The recess 81 is located radially outside the bearing holding portion 82.

The sensor board 90 is a board on which a magnetic sensor such as a Hall IC for detecting the rotational position of the rotor set 3b is mounted on the back surface. The sensor board 90 is located within the recess 81 and is positioned by the recess 81. The sensor board 90 is connected (fixed) to the recess 81, for example, by heat crimping (thermal welding) without using screws. The heat crimped portion (joint portion) 91 is the joint portion of the sensor board 90 to the motor spacer 80. The sensor board 90 can be fixed to the motor spacer 80 by rotational fitting, adhesive, or screw fastening.

The thickness of the sensor board 90 is within the depth of the recess 81, and the sensor board 90 does not protrude rearward from the opening of the recess 81. In other words, the sensor board 90 is within the range of the motor spacer 80 in the front-to-rear direction. The front-to-rear positions of the sensor board 90 and the gear box 5 overlap at least in part. The front-to-rear positions of the sensor board 90 and the front bearing 14 overlap at least in part.

The insulator 15A is a component corresponding to the insulator 15 of the first embodiment, but unlike the insulator 15, there is no need to fix the sensor board, so there is no extension or screw seat for fixing the sensor board, and it has a simple structure.

As shown in Figure 8, the assembly procedure involves preparing the motor spacer 80 to which the front bearing 14 and sensor board 90 are attached, the gear box 5, and its internal parts (such as the reduction gear mechanism 4), and then pressing the output shaft 3a of the motor 3 into the front bearing 14.

Other aspects of this embodiment are the same as those of embodiment 1.

According to this embodiment, the sensor board 90 is arranged in the recess 81 of the motor spacer 80, so the sensor board 90 is arranged closer to the front than the sensor board 9 of the first embodiment. This allows the motor 3 to be moved closer to the front, and the size of the motor housing 2a in the front-to-rear direction can be further reduced compared to the first embodiment, resulting in a compact work machine.

In addition, because the sensor board 90 is positioned by the recess 81, it is easier to position and attach the sensor board 90 compared to when the sensor board 90 is screwed to the insulator 15A, and it is also possible to reduce the size of the insulator 15A and therefore the motor housing 2a.

(Embodiment 3)
11 to 13 relate to a work machine 101 according to a third embodiment of the present invention. Fig. 11 defines the front-rear and up-down directions of the work machine 101, which are perpendicular to each other. The direction perpendicular to the front-rear and up-down directions is defined as the left-right direction. The work machine 101 is an impact driver. The work machine 101 includes a housing 102.

The housing 102 includes a motor housing (body section) 102a, a handle housing (handle section) 102b, and a battery housing (battery attachment/detachment section) 102c. The motor housing 102a, the handle housing 102b, and the battery housing 102c are resin molded bodies with a two-part structure consisting of a left and right section.

The motor housing 102a is a cylindrical part whose central axis is approximately 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.

The handle housing 102b has one end (upper end) connected to the middle part of the motor housing 102a in the front-rear direction and extends downward from the middle part. A trigger switch (operation switch) 106 that allows the user to switch between driving and stopping the motor 103 is provided at the upper end of the handle housing 102b.

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 attached to it. The work machine 101 operates using power from the battery pack 107.

As shown in FIG. 12, the work machine 101 has a motor 103, a 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.

The motor 103 is an inner rotor type brushless motor. The reduction mechanism 104 is held in the gear box 105 in front of the motor 103, and 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 tool tip (not shown). The gear box 105 is, for example, made of metal, and has a cylindrical shape with an open rear end.

The fan 117 is directly connected to the rear 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 to cool the motor 103, etc.

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

The rear case 180 is a cover that is connected to the rear end opening (motor side opening) of the gearbox 105 to close said opening. The rear case 180 is, for example, a resin molded body, and is fixed to the rear end of the gearbox 105, for example, by rotational engagement. The fore-and-aft positions of the gearbox 105 and the rear case 180 overlap at least partially.

The rear case 180 has a recess 181 on the rear surface. The recess 181 is located radially outward from the front bearing 114. The sensor board 190 is located within the recess 181 and is positioned by the recess 181. The sensor board 190 is joined (fixed) to the rear case 180 by, for example, heat crimping. The sensor board 190 may be fixed to the rear case 180 by rotational fitting, adhesion, or screw fastening.

The thickness of the sensor board 190 is within the depth of the recess 181, and the sensor board 190 does not protrude rearward from the opening of the recess 181. In other words, the sensor board 190 is contained within the range of the rear case 180 in the front-to-rear direction. The front-to-rear positions of the sensor board 190 and the front bearing 114 overlap at least partially.

According to this embodiment, a compact work machine can be realized, similar to the second embodiment.

The present invention has been described above using the embodiment as an example, but it will be understood by those skilled in the art that various modifications are possible to each component and each processing process of the embodiment within the scope of the claims.

1...working machine, 2...housing, 2a...motor housing (body section), 2b...handle housing (handle section), 2c...battery housing (battery attachment/detachment section), 2j...air intake, 3...motor, 3a...output shaft, 3b...rotor assembly, 3c...stator assembly, 4...reduction mechanism, 5...gear box (front case), 6...trigger switch, 7...battery pack, 8...motor spacer (lid body), 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 portion, 80...motor spacer (lid), 81...recess, 82...bearing holder, 90...sensor board, 91...thermal crimping portion (joint), 101...working machine, 102...housing, 102a...motor housing (body portion), 102b...handle housing (handle portion), 102c...battery housing (battery attachment/detachment portion), 103...motor, 103a...output shaft, 104...reduction mechanism, 105...gear box, 106...trigger switch, 107...battery pack, 112...tail cover, 113...rear bearing, 114...front bearing, 117...fan, 125...rotary impact mechanism, 180...motor spacer (lid), 190...sensor board.

Claims (9)

A motor;
a gear box having a motor side opening that opens to the motor side;
A cover body connected to the motor side opening;
a sensor board for detecting a rotation state of the motor ;
having
In the axial direction of the motor, the sensor board, or an area where an element, solder, or screw head mounted on the sensor board exists overlaps with the rear part of the gear box and the cover body.
A work machine characterized by: The motor includes a rotor assembly and a stator assembly,
The sensor board is fixed to an insulator provided in the stator assembly.
2. The work machine according to claim 1 . The work machine according to claim 1 , wherein the sensor board is connected to the cover. The work machine according to claim 1 , wherein the cover is provided with a recess for connecting the sensor board. The cover body has a bearing holding portion that holds a bearing,
The work machine according to claim 4 , wherein the recess is located radially outwardly of the bearing holder. The work machine according to claim 1 , wherein the sensor board is connected to the cover without being fastened by screws. The work machine according to claim 1 , wherein the sensor board is positioned by the lid. A fan is provided to generate cooling air.
The gearbox is disposed in front of the motor;
The work machine according to claim 1 , wherein the fan is disposed rearward of the motor. The work machine according to claim 6, wherein the lid has a heat crimping portion that fixes the sensor board, and the sensor board is connected to the lid by the heat crimping portion.

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