WO2023101021A1 - Work machine - Google Patents
Work machine Download PDFInfo
- Publication number
- WO2023101021A1 WO2023101021A1 PCT/JP2022/044624 JP2022044624W WO2023101021A1 WO 2023101021 A1 WO2023101021 A1 WO 2023101021A1 JP 2022044624 W JP2022044624 W JP 2022044624W WO 2023101021 A1 WO2023101021 A1 WO 2023101021A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator
- transmission mechanism
- motor
- housing
- machine according
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 146
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000005192 partition Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/02—Construction of casings, bodies or handles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D49/00—Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws
- B23D49/10—Hand-held or hand-operated sawing devices with straight saw blades
- B23D49/16—Hand-held or hand-operated sawing devices with straight saw blades actuated by electric or magnetic power or prime movers
Definitions
- the present invention relates to working machines.
- a work machine As an example of a work machine, a work machine is known that includes an electric motor, an output section driven by the motor, and a transmission mechanism that transmits the power of the motor to the output section.
- Patent Literature 1 discloses a working machine called a saver saw (also called a reciprocating saw) having a gear case capable of accommodating the transmission mechanism.
- a gear case front housing that houses a transmission mechanism
- a motor case that houses a motor
- a handle case rear housing that houses electrical components other than the motor. and are configured as separate parts.
- the motor and the transmission mechanism are accommodated in separate housings (cases), so it is necessary to assemble the respective housings with high precision. If the housings are not assembled with high precision and the relative positions of the housings change, the axial accuracy of assembly deteriorates, and the operation of the motor and the transmission mechanism may be hindered.
- An object of the present invention is to provide a work machine having a suitable motor (stator) support structure. Another object of the present invention is to provide a work machine that can be easily assembled. Another object of the present invention is to provide a work machine capable of suppressing an increase in size.
- a work machine includes a motor having a stator and a rotor, a resin main housing that houses the motor, an output section that is driven by the motor, and a transmission mechanism that transmits the power of the motor to the output section.
- a metal transmission mechanism housing comprising: a transmission mechanism accommodating portion that accommodates the transmission mechanism; and a stator support portion that is positioned on the outer periphery of the stator and supports the stator; and a main housing made of resin that accommodates the stator.
- Another working machine of the present invention includes a motor having a stator and a rotor, a resin main housing containing the motor and having a regulating portion, an output portion driven by the motor, and the output portion. and a metal transmission mechanism housing containing the transmission mechanism and provided with a fitted portion, wherein the stator includes the motor While being fitted with the fitted portion in a direction along the rotation axis of , movement in a direction away from the transmission mechanism housing is restricted by the restricting portion.
- the present invention it is possible to realize a work machine having a suitable motor (stator) support structure. Furthermore, assembly can be easily performed in the work machine. Furthermore, it is possible to suppress an increase in size of the working machine.
- FIG. 2 is a side view showing the internal structure of the working machine of FIG. 1;
- FIG. 2 is a plan view showing the structure of the working machine of FIG. 1;
- FIG. 4 is a cross-sectional view showing the structure taken along line AA of FIG. 3;
- FIG. 2 is a perspective view showing the structure of a transmission mechanism housing assembled to the work machine of FIG. 1;
- FIG. 6 is a perspective view showing the structure of the transmission mechanism housing of FIG. 5 viewed from below;
- FIG. 2 is an exploded view showing the structure of a transmission mechanism assembled to the working machine of FIG. 1;
- FIG. 2 is an exploded view showing a support structure for a motor assembled to the work machine of FIG. 1;
- FIG. 2 is a perspective view showing the internal structure of a left main housing assembled to the work machine of FIG. 1;
- FIG. 2 is a cross-sectional view showing the support structure of the motor by the main housing in the work machine of FIG. 1, cut along the rotating shaft of the motor;
- FIG. 2 is a cross-sectional view showing a state in which the support structure of the stator by the transmission mechanism housing in the work machine of FIG. 1 is cut in a direction perpendicular to the rotating shaft of the motor and viewed from below;
- FIG. 2 is a cross-sectional view showing a state in which the supporting structure of the bearing holder by the transmission mechanism housing in the work machine of FIG. 1 is cut in a direction perpendicular to the rotating shaft of the motor and viewed from below;
- FIG. 2 is a cross-sectional view showing a cooling air passage in the work machine of FIG. 1;
- a work machine 10 shown in FIGS. 1 to 4 is also called a saver saw, and has a blade 17 as a tip tool.
- the work machine 10 includes a motor 11 having a stator (a part of a current-carrying part) 11a and a rotor 11d, a main housing 12 made of resin that houses the motor 11, a plunger (output part) 35 that is driven by the motor 11, and a transmission mechanism 40 that transmits the power of the motor 11 to the plunger 35 .
- Motor 11 is a brushless motor.
- the main housing 12 includes a body portion (upper portion) 12h, a motor case (lower portion) 15, a handle 14, and a mounting portion (power supply portion) 16.
- a transmission mechanism 40 is housed in the body portion 12h, and the motor case 15
- the motor 11 is housed in the .
- the motor 11 has a stator 11a and a rotor 11d.
- the rotor 11d is integrated with the rotating shaft 11e, and the rotor 11d and the rotating shaft 11e are configured to rotate integrally.
- the rotating shaft 11e is rotatably supported by a bearing 27 located above and a bearing 28 located below.
- the rotor 11d is positioned inside the stator 11a. That is, the motor 11 is an inner rotor type motor.
- the upper end of the motor case 15 and the upper end of the handle 14 are connected to the body portion 12h, respectively, while the lower end of the motor case 15 and the lower end of the handle 14 are connected to the mounting portion 16, respectively. That is, the motor case 15 and the handle 14 extend downward from above substantially parallel to each other.
- a trigger 20 is provided at the upper end portion of the handle 14, and the mounting portion 16 is configured so that the battery pack 13 can be mounted thereon.
- a blade 17 as a tip tool is attached to a blade attachment portion 19 provided at the tip of the plunger 35 .
- a base 18 is rotatably provided at the tip of the body portion 12h, and the workpiece is pressed against the base 18 during cutting.
- the mounting portion 16 connected to the lower side of the motor case 15 is provided with a plurality of intake ports 15a as air inlets, while the body portion 12h connected to the upper side of the motor case 15 is provided with a plurality of air outlets. is provided with an exhaust port 15b. Therefore, the air taken in from the intake port 15a as cooling air passes through the inside of the motor case 15 and is discharged to the outside from the exhaust port 15b.
- the main housing 12 is composed of a hard resin portion 12a and a soft resin portion 12b, and the hard resin portion 12a and the soft resin portion 12b are integrally formed.
- the hard resin portion 12a is made of synthetic resin such as polycarbonate, for example.
- the soft resin portion 12b is mainly arranged on the surface of a portion such as the handle 14 that requires gripping force, or a portion where there is concern that the main housing 12 side or the contact object may be damaged due to contact with materials or the ground. It is made of, for example, an elastomer material or the like.
- the main housing 12 has a right main housing 12c and a left main housing 12d as left and right housing halves. Assembled. As shown in FIG.
- support portions 12e, 12f, and 12i that protrude inward (toward the transmission mechanism housing 23) are provided on the main body portion 12h of the main housing 12 and the inner wall of the motor case 15. As shown in FIG.
- the support portion 12e protruding from the inner surface of the main body portion 12h is positioned outside the transmission mechanism housing 23 radially outside the gear 29 accommodated in the transmission mechanism accommodation portion 23a. Positioning of the transmission mechanism housing 23 with respect to the main housing 12 is performed by abutting thereon.
- the transmission mechanism housing 23 positioned radially outwardly of the gear 29 is partially circular in conformity with the outer shape of the gear 29, and is supported by a support portion 12e consisting of a plurality of ribs spaced vertically and horizontally.
- the transmission mechanism housing 23 is preferably positioned.
- An air passage is formed between the ribs of the support portion 12e.
- a partition wall 12g is provided on the inner surface of the main housing 12. As shown in FIG.
- the partition wall 12 g is a wall (rib) that supports the transmission mechanism housing 23 .
- the partition wall 12g also functions as a wall portion that partitions the internal space of the main housing 12 in the front-rear direction. Although only the support portions 12e, 12f, 12i and partition wall 12g of the left main housing 12d are shown in FIG. 9, similar support portions 12e, 12f, 12i and partition wall 12g are formed in the right main housing 12c.
- the work machine 10 is provided with a metal transmission mechanism housing 23 that accommodates a transmission mechanism 40 that transmits the power of the motor 11 shown in FIG.
- the transmission housing 23 is a single piece molded from a metal such as an aluminum alloy.
- the transmission mechanism housing 23 includes a transmission mechanism accommodating portion 23a that accommodates the transmission mechanism 40, and a stator support portion (fitted portion) 23b that is positioned on the outer periphery of the stator 11a and supports the stator 11a.
- the transmission mechanism housing portion 23a and the stator support portion 23b are formed integrally, and the stator support portion 23b is a support portion extending from the transmission mechanism housing portion 23a toward the stator 11a side (downward side). .
- the transmission mechanism housing 23 is a substantially L-shaped housing.
- a transmission mechanism accommodating portion 23 a that accommodates the transmission mechanism 40 is arranged inside the main body portion 12 h of the main housing 12 , and a stator support portion 23 b that supports the stator 11 a is arranged inside the motor case 15 of the main housing 12 . be.
- the stator support portion 23b is also configured to position the rotor 11d and the rotating shaft 11e in the axial direction. Therefore, the stator support portion 23b can be said to be a motor support portion, and can also be said to be a rotor support portion.
- a trigger switch 20a is provided at the upper end of the handle 14 and operates in conjunction with the trigger 20.
- the mounting portion 16 connected to the lower side of the motor case 15 has a trigger switch 20a for controlling the driving of the motor 11.
- a controller (energization section) 21 is provided.
- the trigger switch 20a and the controller 21 are electrically connected by a wiring 22 routed inside the handle 14 and the mounting portion 16, respectively.
- the transmission mechanism accommodating portion 23a of the transmission mechanism housing 23 is arranged inside the main body portion 12h, and the transmission mechanism is arranged inside the motor case 15 connected to the lower side of the main body portion 12h.
- a stator support portion 23b of the housing 23 is arranged.
- electrical components current-carrying parts
- the transmission mechanism housing 23 covers the current-carrying section including at least one of the stator 11a and the controller 21 (in the working machine 10 of the present embodiment, the stator 11a is the transmission mechanism housing). 23 is covered by the stator support 23b). Therefore, at least part of the stator 11 a is covered by the transmission mechanism housing 23 and also covered by the main housing 12 . Further, the transmission mechanism housing 23 is entirely covered with the main housing 12 . Since a portion of the transmission mechanism housing region 24 and a portion of the electrical component housing region 25 overlap within the motor case 15, it is possible to prevent the working machine 10 from increasing in size.
- the entire transmission mechanism housing 23 is covered with the main housing 12, but a portion of the transmission mechanism housing 23 is covered with the main housing 12 and the other portion is covered with another housing.
- the transmission mechanism housing 23 may be configured to be housed therein, or may be configured so that the entire transmission mechanism housing 23 is housed in a separate housing that is a separate portion (separate member) from the main housing 12 .
- the entire transmission mechanism housing 23 is covered with the main housing 12, the number of parts can be reduced.
- the stator support portion 23b of the transmission mechanism housing 23 is provided with a stator 11a including a stator core 11b around which a stator coil 11c is wound and an insulator 11h made of an insulating member.
- a sensor substrate 21a mounted with a Hall IC for detecting the rotational position of the motor 11 (rotor 11d or rotating shaft 11e) is attached to the stator 11a (insulator 11h). Accordingly, the sensor substrate 21a is configured to be held by the transmission mechanism housing 23 (the stator support portion 23b).
- a pinion (not shown) is provided at the upper end of the rotating shaft 11 e configured to rotate integrally with the rotor 11 d , and the pinion is meshed with the gear 29 .
- the rotary shaft 11e is held by an upper bearing 27 at its upper portion and by a lower bearing 28 at its lower portion. That is, the lower bearing 28 provided on the rotating shaft 11e is supported by a bearing holder 26 made of resin.
- a centrifugal fan (fan) 51 for supplying air in the radial direction of the rotating shaft 11e is provided on the rotating shaft 11e of the motor 11. As shown in FIG. A fan guide 50 is provided on the stator 11a side of the centrifugal fan (fan) 51 to guide the flow of air.
- a gear 29 meshing with the rotating shaft 11e of the motor 11 rotates about a rotating shaft 30 supported by the transmission mechanism accommodating portion 23a.
- the gear 29 is provided with a crank 34 that rotates together with the gear 29, and the crank 34 rotates eccentrically as the gear 29 rotates.
- the crank 34 is provided with a plunger (output portion) 35, and when the crank 34 rotates eccentrically, the plunger 35 reciprocates. Further, the reciprocating motion of the plunger 35 causes the blade 17 attached to the blade attachment portion 19 at the tip of the plunger 35 to reciprocate.
- the reciprocating motion of the plunger 35 is guided by two rollers 36 provided inside the body portion 12h.
- a counterweight 37 is provided at the upper end of the crank 34 .
- the counterweight 37 also reciprocates.
- the plunger 35 and the counterweight 37 are provided so as to operate 180 degrees out of phase with each other. For example, when the plunger 35 advances, the counterweight 37 retracts, and when the plunger 35 retracts, the counterweight 37 advances. Thereby, the counterweight 37 cancels out the vibration caused by the operation of the plunger 35 .
- a plurality of steel balls 31 are arranged on the lower surface of the gear 29 , and the plurality of steel balls 31 are supported by strut washers 32 . Furthermore, a damper 33 is provided below the strut washer 32 . Therefore, the gear 29 tilts when receiving a reaction force, but the damper 33 is structured to absorb the reaction force, thereby suppressing the gear 29 from tilting.
- the rotating shaft 11e of the motor 11 and the gear 29 are meshed by a helical gear. configured to be granted.
- the lower end of the rotating shaft 11e of the motor 11 is supported by the bearing holder 26 via the lower bearing 28, but when the load is high, the rotating shaft 11e is pulled upward, so the bearing The holder 26 is not disengaged by being biased downward, and the support structure for the motor 11 is structured so as not to be easily disassembled.
- the battery pack 13 contains a plurality of battery cells 13a and power is supplied from the battery pack 13 to the motor 11 .
- the trigger 20 of the handle 14 is operated by the operator, the trigger switch 20a incorporated in the handle 14 is actuated, the power for the cutting operation is output from the controller 21, and the motor current is supplied to the motor 11. .
- the motor 11 operates, and when the crank 34 rotates eccentrically due to the rotation of the gear 29, the plunger 35 reciprocates (moves back and forth).
- the blade 17 attached to the tip of the plunger 35 reciprocates (moves back and forth) to perform cutting.
- the motor 11 is a brushless motor
- the controller 21 is equipped with a plurality of switching elements (inverter circuits) for controlling the motor 11 and a control section (microcontroller) for on/off controlling the switching elements.
- the transmission mechanism housing 23 is a metal housing integrally formed with a transmission mechanism accommodating portion 23a arranged in the upper portion and a stator support portion 23b arranged in the lower portion. It is composed of a box-shaped (container-shaped) transmission mechanism accommodating portion 23a and an annular (cylindrical)-shaped stator support portion 23b. That is, the transmission mechanism accommodating portion 23a and the stator support portion 23b are each part of a single component (the transmission mechanism housing 23) and are configured inseparably.
- the stator support portion 23b extends downward from the transmission mechanism housing portion 23a.
- the transmission mechanism housing portion 23a houses the transmission mechanism 40, and the stator support portion 23b supports the stator 11a.
- a side wall 23c of the transmission mechanism accommodating portion 23a is provided with a plurality of screw bosses 23d. is screwed.
- a plurality of ribs 23c1 are formed on the side wall 23c.
- a bearing portion 23j that supports the rotating shaft 11e of the motor 11 and a bearing portion 23k that supports the rotating shaft 30 of the gear 29 are provided at the bottom of the transmission mechanism accommodating portion 23a. ing.
- the bearing portion 23j has a circular motor shaft opening 23g in which the rotary shaft 11e is arranged, and the bearing portion 23k has a circular transmission mechanism shaft opening 23h in which the rotary shaft 30 is arranged.
- the bearing portion 23j and the bearing portion 23k are provided with a plurality of ribs 23e and 23f extending in the radial direction of the respective rotating shafts 11e and 30, and have a circular motor shaft opening 23g and a circular transmission mechanism shaft opening.
- the center positions of the portions 23h are ensured with high accuracy so as not to shift.
- At least a gear 29 as a transmission mechanism 40 and an eccentrically rotating crank 34 attached to the gear 29 are provided in the transmission mechanism accommodating portion 23 a of the transmission mechanism housing 23 .
- the crank 34 is provided with a plunger 35 as an output portion via a sleeve 41 . More specifically, the crank 34 is engaged with the hole 35a of the plunger 35 via the sleeve 41, and when the crank 34 rotates eccentrically due to the rotation of the gear 29, the plunger 35 reciprocates.
- a blade attachment portion 19 is provided at the tip of the plunger 35 via an O-ring 39 , and a blade 17 is attached to the blade attachment portion 19 covered with a dust guard 38 .
- the plunger 35 reciprocates with its tip portion guided by a roller 36 .
- the O-ring 39 is held in a groove formed in the front end portion of the transmission mechanism housing 23 .
- a plurality of steel balls 31 are arranged in a circle on the lower surface side of the gear 29 . These steel balls 31 are supported by strut washers 32 and are in contact with the lower surface of the gear 29 . Furthermore, a damper 33 is provided below the strut washer 32 . As a result, the damper 33 absorbs the reaction force that the gear 29 receives, and the inclination of the gear 29 can be suppressed.
- the plunger 35 is supported by guide members 42 arranged on both left and right sides so as to be able to reciprocate on guide members 42 attached via bolts 35b.
- a groove is formed inside the guide member 42, and the side portion of the plunger 35 is inserted into this groove. Thereby, the plunger 35 is supported by the left and right guide members 42 so as to be able to reciprocate (back and forth).
- a counterweight 37 is provided at the upper end of the crank 34 and operates 180 degrees out of phase with the plunger 35 . That is, when the crank 34 rotates eccentrically, the counterweight 37 also reciprocates, so that the counterweight 37 cancels the vibration caused by the operation of the plunger 35 .
- the counterweight 37 is reciprocally supported by metal guides 46 arranged on both left and right sides, and each guide 46 is supported by a rubber damper 47 . As a result, the damper 47 absorbs the vibration of the counterweight 37 when it moves.
- the left and right guides 46 are supported by spacers 43, respectively, and a metal plate 44 for pressing the guide member 42 of the plunger 35 is tightened from above by bolts 44a.
- the counterweight 37 is supported by guides 46 via a plurality of steel balls 45 arranged in grooves 37b formed on the side surfaces of the counterweight 37. As shown in FIG. That is, a plurality of steel balls 45 are sandwiched between guides 46 provided on both left and right sides of the counterweight 37, and the guides 46 can reciprocate (forward and backward) through the plurality of steel balls 45. supported by A plurality of steel balls 45 are also arranged in the holes 37 a on the upper surface of the counterweight 37 , and these steel balls 45 are pressed by the upper cover 49 of the transmission mechanism housing 23 .
- the stator 11a is directly supported by the transmission mechanism housing 23 made of metal. Accordingly, assembly of the housing can be easily performed without requiring high assembly accuracy.
- the transmission mechanism accommodating portion 23a that accommodates the transmission mechanism 40 and the stator support portion 23b that supports the stator 11a are integrally molded, screws for assembling these two housings are not required. Therefore, since the number of screw bosses can also be reduced, it is possible to suppress an increase in the size of work machine 10 due to the provision of screw bosses. Furthermore, since the number of screws can be reduced, cost reduction of the work machine 10 can be achieved.
- the stator support portion 23b includes a plurality of extension portions 23b1 extending downward (toward the stator 11a) from the transmission mechanism housing portion 23a, a connection portion 23b2 connecting the two extension portions 23b1, and an extension portion 23b1. and a connecting portion 23b2, a rib 23b4 provided on the outer side of the extending portion 23b1, and a fitted portion 23b5 provided on the inner side of the extending portion 23b1.
- a total of four extending portions 23b1 are formed, two on the left side of the transmission mechanism housing 23 and two on the right side.
- the connection portion 23b2 is connected to the lower ends of the two extending portions 23b1 located on the left side or the right side and spaced apart in the front-rear direction.
- the connecting portion 23b2 is formed in a substantially arc shape (partially annular shape).
- the opening 23b3 is a space that communicates the inside and the outside of the stator support portion 23b.
- the opening 23b3 serves as a path for air sent from the centrifugal fan 51.
- the opening 23b3 is an opening (space) surrounded by the extending portion 23b1 and the connecting portion 23b2 and extending in a direction parallel to the rotating shaft 11e.
- the opening 23 b 3 also functions as a thinned portion for reducing the weight of the transmission mechanism housing 23 .
- the rib 23b4 is a portion that engages with the main housing 12. As shown in FIG.
- the rib 23b4 also functions as a reinforcing rib that makes it difficult for the extending portion 23b1 to bend in the left-right direction.
- the fitted portion 23b5 is a portion of the extending portion 23b1 that is recessed toward the outside, and is a portion that fits (engages) with the stator 11a directly or indirectly. Due to the recessed fitted portion 23b5, a step is generated at the upper end portion of the fitted portion 23b5, and this portion serves as an abutment portion 23b6 against which a fan guide 50 (to be described later) abuts.
- the abutting portion 23b6 is provided on each of the four extending portions 23b1.
- FIG. 8 assembly of the stator 11a and the rotor 11d (rotary shaft portion) to the stator support portion 23b of the transmission mechanism housing 23 will be described with reference to FIGS. 8 to 10.
- FIG. First the rotor 11d, the rotating shaft 11e, the centrifugal fan 51, the bearing 27, and the bearing 28 are unitized (as a rotating shaft portion).
- the unitized bearing 27 is attached to the transmission mechanism housing 23 .
- the rotor 11 d , the rotating shaft 11 e and the centrifugal fan 51 are held by the transmission mechanism housing 23 .
- the fan guide (positioning member) 50 fitted to the outer periphery of the stator 11a the fan guide 50 and the fitted portion 23b5 are fitted from the lower side of the stator support portion 23b. That is, the stator 11a is inserted in the direction (vertical direction) along the rotating shaft 11e of the motor 11 and fitted with the stator support portion 23b (fitted portion 23b5). Specifically, the four support portions 50a of the ring-shaped fan guide 50 that guides the air flow generated by the centrifugal fan 51 are press-fitted inside the stator support portion 23b (fitted portion 23b5). The stator 11a is fitted to the fan guide 50 (supporting portion 50a) fitted to the stator supporting portion 23b.
- a chamfered portion 50c is formed on the outer surface (upper end) of the support portion 50a of the fan guide 50 so that it can be easily fitted into the stator support portion 23b.
- the ring-shaped fan guide 50 is partially formed with a notch 50b for an air passage. As shown in FIG. 10, the fan guide 50 inserted (fitted) into the stator support portion 23b (fitted portion 23b5) abuts against the abutting portion 23b6 of the stator support portion 23b, thereby preventing upward movement. Regulated.
- the bearing holder 26 made of resin is fitted inside the annular stator support portion 23b from below.
- a chamfered portion 26b is also formed on the outer surface of the support portion 26a of the bearing holder 26 so that it can be easily fitted into the stator support portion 23b (fitted portion 23b5).
- the stator support portion 23 b is provided so as to cover the support portion 50 a of the fan guide 50 and the support portion 26 a of the bearing holder 26 .
- both the transmission mechanism housing 23 and the stator core 11b are made of metal, and when the stator core 11b is directly press-fitted into the transmission mechanism housing 23, the metals are fitted together. can be difficult to do.
- the support portion 50a of the fan guide 50 and the support portion 26a of the bearing holder 26 are each made of resin, and are easily crushable compared to the transmission mechanism housing 23 and the stator core 11b.
- the resin positioning member fan guide 50
- the stator support portion 23b transmission mechanism housing 23
- stator 11a since the resin positioning member (fan guide 50) is interposed between the stator support portion 23b (transmission mechanism housing 23) and the stator 11a, press fitting can be easily performed by crushing the positioning member. This makes it easier for a person to manually insert the stator core 11b into the stator support portion 23b.
- an electrically insulating (made of resin) positioning member is interposed between the stator 11a and the transmission mechanism housing 23 (stator support portion 23b).
- the stator 11a is supported by the transmission mechanism housing 23 via an insulating member.
- an insulating fan guide 50 is interposed between the stator 11 a and the transmission mechanism housing 23 . In this way, while the transmission mechanism housing 23 supports the stator 11a, it is possible to electrically insulate between the stator 11a having the conducting portion and the transmission mechanism housing 23 made of metal.
- the extension portion 23b1 of the stator support portion 23b moves radially around the rotation shaft 11e (a direction along a plane extending in the front, rear, left, and right directions). ), it tries to deform in this direction, but since the connecting portion 23b2 connects the extending portions 23b1, the extending portions 23b1 are restrained from being relatively separated from each other. Thus, the extension portion 23b1 (fitted portion 23b5) can be prevented from being separated from the stator 11a.
- a positioning member for positioning the stator 11a is provided on the outer peripheral portion of the stator 11a, and the stator 11a is supported by the stator support portion 23b of the transmission mechanism housing 23 via the positioning member.
- a fan guide 50 that serves as a guide for the centrifugal fan 51 and a bearing holder 26 that holds the lower bearing 28 are provided as positioning members for the stator 11a. That is, the stator 11a is supported by the stator support portion 23b of the transmission mechanism housing 23 without using fasteners such as screws. In other words, the stator 11a is supported by the stator support portion 23b of the transmission mechanism housing 23 by fitting.
- the fan guide 50 and the bearing holder 26 as positioning members for the stator 11a, the parts can be shared, and the cost of the work machine 10 can be reduced. Further, there is no need to provide a detent structure for the stator 11a or the transmission mechanism housing 23, and the structure around the motor can be simplified.
- the upper bearing 27 is fixed by a bearing lock 27a, and the lower bearing 28 is fixed by a bearing lock 28a.
- the stator 11a and the rotating shaft (rotor 11d, rotating shaft 11e, etc.) are held in the transmission mechanism housing 23 by a certain amount of holding force in the axial direction (vertical direction) by press-fitting or bearing locking. When it is urged in the direction, it is detached from the stator support portion 23b.
- the stator 11a and the rotary shaft can be pulled out of the transmission mechanism housing 23 if they are strongly pulled downward.
- the main housing 12 regulates axial movement of the stator 11a and the rotating shaft portion (rotor 11d, rotating shaft 11e, etc.).
- the support portion 12f of the main housing 12 is a restricting portion that restricts movement of the stator 11a in the direction away from the transmission mechanism 40 (the downward direction).
- the lower end of the stator support portion 23b also abuts on the support portion 12f.
- the bearing holder 26 when the right main housing 12c and the left main housing 12d are assembled, the bearing holder 26 is supported from below by the support portion 12f of the main housing 12, and the transmission mechanism housing 23 is also supported by the support portions 12e and 12i of the main housing 12. Supported by The bearing holder 26 axially supports a bearing 28 that supports the rotating shaft 11e, and axially supports the stator 11a (stator core 11b) from bottom to top. Therefore, when the bearing holder 26 is restricted from moving downward, the downward movement of the rotating shaft 11e and the stator 11a is also restricted. In other words, by assembling the right main housing 12c and the left main housing 12d, fixing the positions of the stator 11a and the rotor 11d is completed. In other words, the stator 11a is fixed to the transmission mechanism housing 23 by screws for assembling the right main housing 12c and the left main housing 12d.
- FIG. 11 is a bottom view of a section around the stator support portion 23b in the front, rear, left, and right directions at a position below the support portion 12f.
- the outer peripheral portion of the stator 11a is formed with four protrusions 11f projecting outward in the circumferential direction.
- the support portion 50a of the fan guide 50 is fitted so as to cover each of these four projections 11f, and is engaged in the clockwise and counterclockwise directions in FIG. 11 (rotation prevention portion S2). .
- stator support portion 23b of the transmission mechanism housing 23 is fitted so as to cover the four support portions 50a at each of the four support portions 50a, and engages in the clockwise and counterclockwise directions in FIG. ing.
- the fan guide 50 is prevented from rotating by the transmission mechanism housing 23 and the stator 11a is prevented from rotating by the fan guide 50 .
- the rotation of the transmission mechanism housing 23 with respect to the main housing 12 is also prevented by engaging the rib 23b4 provided on the outside of the extension portion 23b1 with (the concave portion of) the support portion 12f.
- the ribs 23b4 are provided on each of the four extending portions 23b1, and are engaged with the support portion 12f at a total of four locations, two on each side.
- the fan guide 50 is provided with a protrusion 50d, and a recess 11g is provided on the outer periphery of the stator 11a. In addition, it is possible to prevent the stator 11a from being incorrectly assembled with respect to the fan guide 50 (the anti-rotation portion S1).
- FIG. 12 is a bottom view of a cross section in the front, rear, left, and right directions at a position just above the bearing 28.
- a chamfered portion 26b is formed on each of the four support portions 26a of the bearing holder 26.
- projections 23b7 are formed at four locations (fitted portions 23b5) corresponding to the circumferential support portions 26a of the stator support portion 23b of the transmission mechanism housing 23.
- the rotation of the bearing holder 26 can be prevented by engaging the protrusions 23b7 of the stator support portion 23b at four locations (rotation prevention portions S3). More specifically, the front left and rear right protrusions 23b7 with respect to the rotation shaft 11e restrict the clockwise rotation of the bearing holder 26 in FIG. The protrusion 23b7 restricts the counterclockwise rotation of the bearing holder 26 in FIG.
- the rotation of the centrifugal fan 51 provided on the rotating shaft 11e of the motor 11 generates a negative pressure below the centrifugal fan 51, and air (outside air) is taken into the working machine 10. .
- air is taken in from the intake port 15 a of the main housing 12 (air passage 52 ), mainly passes through the inside of the stator 11 a and reaches the centrifugal fan 51 .
- the air reaching the centrifugal fan 51 is blown radially outward by the centrifugal fan 51 .
- the air blown radially outward by the centrifugal fan 51 hits the inner wall of the main housing 12 and is guided in the moving direction.
- the support portion 12i and the fan guide 50 are provided below the centrifugal fan 51, the air hitting the inner wall of the main housing 12 is suppressed from flowing downward. Therefore, the air hitting the inner wall of the main housing 12 mainly flows upward.
- the air that is blown upward by the centrifugal fan 51 passes through the side surface of the transmission mechanism housing 23 and then exits through the exhaust port 15b of the main housing 12 (air passage 54).
- the space outside the transmission mechanism accommodating portion 23a in the left-right direction is partitioned in the front-rear direction by the partition wall 12g, so that the air blown from the centrifugal fan 51 does not flow forward.
- the fan guide 50 is formed with the notch 50b, the air passing through the outer periphery of the stator 11a can flow into the centrifugal fan 51 through the notch 50b (air passage 53).
- the stator support portion 23b is provided with an opening portion 23b3 that is an opening penetrating in the radial direction (horizontal direction).
- the stator support portion 23b has a tubular shape without a hole, it becomes difficult to flow air to the outside of the transmission mechanism housing 23, but in the case of the present embodiment, it is possible to create an air passage by the opening portion 23b3. can.
- the air from the centrifugal fan 51 is immediately sent to the outside of the transmission mechanism housing 23, so that the air flows smoothly.
- the air from the centrifugal fan 51 may first pass through the transmission mechanism housing 23 and then be discharged to the outside of the transmission mechanism housing 23 through a through hole or the like.
- a through hole serving as an air passage is provided above the centrifugal fan 51, but the transmission mechanism accommodating portion 23a filled with lubricant (grease) is positioned immediately above the stator support portion 23b.
- stator support portion 23b (stator 11a) slightly downward, which may lead to an increase in the size of the main body. Therefore, the configuration of the present application in which the opening 23b3 is positioned radially outward of the centrifugal fan 51 is more suitable for the working machine.
- the intake port 15a and the exhaust port 15b are provided in the right main housing 12c and the left main housing 12d, respectively, so that cooling air can be supplied to the left and right sides of the stator 11a and the transmission mechanism housing 23, respectively.
- a plurality of ribs 23c1 are formed on the side wall 23c of the transmission mechanism housing 23. These ribs function as radiating fins, and air flows outside the ribs 23c1, so that the transmission mechanism housing 23 can be cooled appropriately. can be done.
- the present invention is not limited to the above embodiments, and can be modified in various ways without departing from the scope of the invention.
- the stator support portion 23b is positioned below the transmission mechanism housing 23.
- the stator support portion 23b (stator 11a) is positioned behind the transmission mechanism housing 23.
- the present invention can be applied to work machines such as grinders and jigsaws that use a metal transmission mechanism housing.
- the present invention can also be applied to a system that uses an AC power supply instead of a battery pack (battery), that is, a system that has a power cord.
- the number of extension portions 23b1 is four, it may be more or less.
- the main housing 12 is composed of the hard resin portion 12a and the soft resin portion 12b, it may be composed of only the hard resin portion.
- Main housing 12a Hard resin portion 12b Soft resin portion 12c Right main housing 12d Left main housing 12e Supporting portion 12f Supporting portion (restriction portion) 12g Partition wall 12h Body portion 12i Supporting portion 13 Battery pack 13a Battery cell 14 Handle 15 Motor case 15a Intake port 15b Exhaust port 16 Mounting part 17 Blade 18 Base 19 Blade mounting part 20
- Trigger 20a Trigger switch 21 Controller (energizing portion) 21a Sensor substrate 22 Wiring 23 Transmission mechanism housing 23a Transmission mechanism accommodating portion 23b Stator support portion (fitted portion) 23c side wall 23d screw boss 23e, 23f rib 23g motor shaft opening 23h transmission mechanism shaft opening 23b7 protrusion 23j, 23k bearing 24 transmission mechanism housing region , 25... Electric component housing area 26...
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The present invention allows easy assembly of a work machine. A work machine 10 comprises: a motor 11 having a stator 11a and a rotor 11d; a main housing 12 that is made of a resin, and stores the motor 11; a plunger 35 that is driven by the motor 11; a transmission mechanism 40 that transmits the power of the motor 11 to the plunger 35; and a transmission mechanism housing 23 that is made of a metal, and stores the transmission mechanism 40. A blade 17 is attached to the plunger 35. The transmission mechanism housing 23 has a stator support part that is located on an outer peripheral part of the stator 11a, and supports the stator 11a.
Description
本発明は、作業機に関する。
The present invention relates to working machines.
作業機の一例として、電動のモータと、前記モータによって駆動される出力部と、前記出力部に前記モータの動力を伝達する伝達機構と、を備える作業機が知られている。
As an example of a work machine, a work machine is known that includes an electric motor, an output section driven by the motor, and a transmission mechanism that transmits the power of the motor to the output section.
上述のような作業機として、例えば、特許文献1には、前記伝達機構を収容可能なギヤケースを備えたセーバソーとも(レシプロソーとも)呼ばれる作業機が開示されている。
As a working machine as described above, for example, Patent Literature 1 discloses a working machine called a saver saw (also called a reciprocating saw) having a gear case capable of accommodating the transmission mechanism.
上述の特許文献1に記載された作業機(セーバソー)では、伝達機構を収容するギヤケース(フロントハウジング)と、モータを収容するモータケースと、モータ以外の電気部品を収容するハンドルケース(リヤハウジング)とがそれぞれ別部品として構成されている。
In the work machine (saber saw) described in Patent Document 1, a gear case (front housing) that houses a transmission mechanism, a motor case that houses a motor, and a handle case (rear housing) that houses electrical components other than the motor. and are configured as separate parts.
このような作業機では、モータと伝達機構とが別々のハウジング(ケース)に収容されるため、それぞれのハウジングを精度よく組付ける必要がある。それぞれのハウジングが精度よく組付けられずに各ハウジングの相対位置が変化すると、組付けの軸精度等が悪化し、モータや伝達機構の動作に支障を来たす恐れがある。
In such a work machine, the motor and the transmission mechanism are accommodated in separate housings (cases), so it is necessary to assemble the respective housings with high precision. If the housings are not assembled with high precision and the relative positions of the housings change, the axial accuracy of assembly deteriorates, and the operation of the motor and the transmission mechanism may be hindered.
また、別々のハウジング同士を組付けるのにねじ等の固定具が必要となるため、固定具による部品点数の増加及びコスト増加が発生する恐れがある。また、ねじボスによって作業機が大型化する懸念がある。
In addition, since fasteners such as screws are required to assemble separate housings, there is a risk that the fasteners will increase the number of parts and increase costs. In addition, there is a concern that the work machine will become large due to the screw boss.
本発明の目的は、好適なモータ(ステータ)の支持構成を有する作業機を提供することである。さらに、組付けを容易に行うことが可能な作業機を提供することである。さらに、大型化を抑制することが可能な作業機を提供することである。
An object of the present invention is to provide a work machine having a suitable motor (stator) support structure. Another object of the present invention is to provide a work machine that can be easily assembled. Another object of the present invention is to provide a work machine capable of suppressing an increase in size.
本発明の作業機は、ステータ及びロータを有するモータと、前記モータを収容する樹脂製のメインハウジングと、前記モータによって駆動される出力部と、前記出力部に前記モータの動力を伝達する伝達機構と、前記伝達機構を収容する伝達機構収容部と、前記ステータの外周に位置して前記ステータを支持するステータ支持部と、を備える金属製の伝達機構ハウジングと、前記ステータ支持部に支持された前記ステータを収容する樹脂製のメインハウジングと、を有する。
A work machine according to the present invention includes a motor having a stator and a rotor, a resin main housing that houses the motor, an output section that is driven by the motor, and a transmission mechanism that transmits the power of the motor to the output section. a metal transmission mechanism housing comprising: a transmission mechanism accommodating portion that accommodates the transmission mechanism; and a stator support portion that is positioned on the outer periphery of the stator and supports the stator; and a main housing made of resin that accommodates the stator.
また、本発明の他の作業機は、ステータ及びロータを有するモータと、前記モータを収容するとともに、規制部を備えた樹脂製のメインハウジングと、前記モータによって駆動される出力部と、前記出力部に前記モータの動力を伝達する伝達機構と、前記伝達機構を収容するとともに、被嵌合部を備えた金属製の伝達機構ハウジングと、を有する作業機であって、前記ステータは、前記モータの回転軸に沿った方向で前記被嵌合部と嵌合されるとともに、前記規制部によって前記伝達機構ハウジングから離間する方向の移動が規制される。
Another working machine of the present invention includes a motor having a stator and a rotor, a resin main housing containing the motor and having a regulating portion, an output portion driven by the motor, and the output portion. and a metal transmission mechanism housing containing the transmission mechanism and provided with a fitted portion, wherein the stator includes the motor While being fitted with the fitted portion in a direction along the rotation axis of , movement in a direction away from the transmission mechanism housing is restricted by the restricting portion.
本発明によれば、好適なモータ(ステータ)の支持構成を有する作業機を実現できる。さらに、作業機において組付けを容易に行うことができる。さらに、作業機の大型化を抑制することができる。
According to the present invention, it is possible to realize a work machine having a suitable motor (stator) support structure. Furthermore, assembly can be easily performed in the work machine. Furthermore, it is possible to suppress an increase in size of the working machine.
以下、本発明の実施の形態について、図面を用いて詳細に説明する。本実施の形態の説明で用いる複数の図において、同じ要素には同じ符号を付してある。本実施の形態では作業機の一例として、先端工具を電動モータにより駆動する電動の作業機について説明する。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same elements are denoted by the same reference numerals in a plurality of drawings used in the description of the present embodiment. In the present embodiment, as an example of a working machine, an electric working machine that drives a tip tool by an electric motor will be described.
図1~図4に示される作業機10は、セーバソーとも呼ばれ、先端工具としてブレード17が取り付けられている。作業機10は、ステータ(通電部の一部)11a及びロータ11dを有するモータ11と、モータ11を収容する樹脂製のメインハウジング12と、モータ11によって駆動されるプランジャ(出力部)35と、プランジャ35にモータ11の動力を伝達する伝達機構40と、を有している。モータ11はブラシレスモータである。
A work machine 10 shown in FIGS. 1 to 4 is also called a saver saw, and has a blade 17 as a tip tool. The work machine 10 includes a motor 11 having a stator (a part of a current-carrying part) 11a and a rotor 11d, a main housing 12 made of resin that houses the motor 11, a plunger (output part) 35 that is driven by the motor 11, and a transmission mechanism 40 that transmits the power of the motor 11 to the plunger 35 . Motor 11 is a brushless motor.
メインハウジング12は、本体部(上部)12h、モータケース(下部)15、ハンドル14及び装着部(電源供給部)16を備えており、本体部12hには伝達機構40が収容され、モータケース15にはモータ11が収容されている。モータ11はステータ11aと、ロータ11dを有する。ロータ11dは回転軸11eと一体化されており、ロータ11dと回転軸11eは一体的に回転するように構成される。回転軸11eは上側に位置するベアリング27と、下側に位置するベアリング28によって回転可能に支持される。ロータ11dはステータ11aの内側に位置する。すなわちモータ11はインナーロータ型のモータである。モータケース15の上端部及びハンドル14の上端部がそれぞれ本体部12hに接続され、一方、モータケース15の下端部及びハンドル14の下端部がそれぞれ装着部16に接続されている。すなわち、モータケース15及びハンドル14は、互いに略平行に上方から下方に向かって延びている。そして、ハンドル14の上端部にはトリガ20が設けられ、装着部16は、電池パック13が装着可能に構成される。
The main housing 12 includes a body portion (upper portion) 12h, a motor case (lower portion) 15, a handle 14, and a mounting portion (power supply portion) 16. A transmission mechanism 40 is housed in the body portion 12h, and the motor case 15 The motor 11 is housed in the . The motor 11 has a stator 11a and a rotor 11d. The rotor 11d is integrated with the rotating shaft 11e, and the rotor 11d and the rotating shaft 11e are configured to rotate integrally. The rotating shaft 11e is rotatably supported by a bearing 27 located above and a bearing 28 located below. The rotor 11d is positioned inside the stator 11a. That is, the motor 11 is an inner rotor type motor. The upper end of the motor case 15 and the upper end of the handle 14 are connected to the body portion 12h, respectively, while the lower end of the motor case 15 and the lower end of the handle 14 are connected to the mounting portion 16, respectively. That is, the motor case 15 and the handle 14 extend downward from above substantially parallel to each other. A trigger 20 is provided at the upper end portion of the handle 14, and the mounting portion 16 is configured so that the battery pack 13 can be mounted thereon.
先端工具であるブレード17は、プランジャ35の先端に設けられたブレード取付部19に取り付けられる。本体部12hの先端にはベース18が回動可能に設けられており、切断加工時には、ベース18に被加工物を押し当てて切断加工が実施される。
A blade 17 as a tip tool is attached to a blade attachment portion 19 provided at the tip of the plunger 35 . A base 18 is rotatably provided at the tip of the body portion 12h, and the workpiece is pressed against the base 18 during cutting.
モータケース15の下方に接続される装着部16には、空気の入り口として複数の吸気口15aが設けられ、一方、モータケース15の上方に接続される本体部12hには、空気の出口として複数の排気口15bが設けられている。したがって、冷却風として吸気口15aから取り込まれた空気は、モータケース15の内部を通って排気口15bから外部に排出される。
The mounting portion 16 connected to the lower side of the motor case 15 is provided with a plurality of intake ports 15a as air inlets, while the body portion 12h connected to the upper side of the motor case 15 is provided with a plurality of air outlets. is provided with an exhaust port 15b. Therefore, the air taken in from the intake port 15a as cooling air passes through the inside of the motor case 15 and is discharged to the outside from the exhaust port 15b.
メインハウジング12は、硬質樹脂部12aと軟質樹脂部12bとからなり、硬質樹脂部12aと軟質樹脂部12bとが一体成形によって形成される。硬質樹脂部12aは、例えば、ポリカーボネート等の合成樹脂からなる。一方、軟質樹脂部12bは、主にハンドル14等のグリップ力を必要とする箇所や、材料や地面等への接触によってメインハウジング12側または接触対象への傷つきが懸念される箇所の表面に配置され、例えば、エラストマ材等からなる。また、メインハウジング12は、図3に示されるように、左右2つのハウジング半体として右側メインハウジング12c及び左側メインハウジング12dを有し、これら2つのハウジング半体を突き合わせることによってメインハウジング12が組み立てられる。図9に示されるように、メインハウジング12の本体部12hやモータケース15の内壁には、内側(伝達機構ハウジング23側)に突出した支持部12e,12f,12iが設けられている。本体部12hの内面から突出する支持部12eは伝達機構収容部23aに収容されたギヤ29の径方向外側に位置する伝達機構ハウジング23の外方に位置しており、伝達機構ハウジング23の外面に当接してメインハウジング12に対する伝達機構ハウジング23の位置決めを行っている。ギヤ29の径方向外側に位置する伝達機構ハウジング23はギヤ29の外形に合わせて部分的に円形となっているが、前後上下に離間した複数のリブからなる支持部12eがこの部分を支持することで好適に伝達機構ハウジング23の位置決めを行っている。なお、支持部12eにおけるリブとリブの間には風路が形成される。また、メインハウジング12の内面には隔壁12gが設けられている。隔壁12gは、伝達機構ハウジング23を支持する壁(リブ)である。隔壁12gは、メインハウジング12の内部空間を前後方向で区画する壁部としても機能する。図9には左側メインハウジング12dの支持部12e,12f,12i,隔壁12gのみ図示されているが、右側メインハウジング12cにも同様の支持部12e,12f,12i,隔壁12gが形成されている。
The main housing 12 is composed of a hard resin portion 12a and a soft resin portion 12b, and the hard resin portion 12a and the soft resin portion 12b are integrally formed. The hard resin portion 12a is made of synthetic resin such as polycarbonate, for example. On the other hand, the soft resin portion 12b is mainly arranged on the surface of a portion such as the handle 14 that requires gripping force, or a portion where there is concern that the main housing 12 side or the contact object may be damaged due to contact with materials or the ground. It is made of, for example, an elastomer material or the like. As shown in FIG. 3, the main housing 12 has a right main housing 12c and a left main housing 12d as left and right housing halves. Assembled. As shown in FIG. 9, support portions 12e, 12f, and 12i that protrude inward (toward the transmission mechanism housing 23) are provided on the main body portion 12h of the main housing 12 and the inner wall of the motor case 15. As shown in FIG. The support portion 12e protruding from the inner surface of the main body portion 12h is positioned outside the transmission mechanism housing 23 radially outside the gear 29 accommodated in the transmission mechanism accommodation portion 23a. Positioning of the transmission mechanism housing 23 with respect to the main housing 12 is performed by abutting thereon. The transmission mechanism housing 23 positioned radially outwardly of the gear 29 is partially circular in conformity with the outer shape of the gear 29, and is supported by a support portion 12e consisting of a plurality of ribs spaced vertically and horizontally. Thus, the transmission mechanism housing 23 is preferably positioned. An air passage is formed between the ribs of the support portion 12e. A partition wall 12g is provided on the inner surface of the main housing 12. As shown in FIG. The partition wall 12 g is a wall (rib) that supports the transmission mechanism housing 23 . The partition wall 12g also functions as a wall portion that partitions the internal space of the main housing 12 in the front-rear direction. Although only the support portions 12e, 12f, 12i and partition wall 12g of the left main housing 12d are shown in FIG. 9, similar support portions 12e, 12f, 12i and partition wall 12g are formed in the right main housing 12c.
また、図2に示されるように、作業機10には、図4に示されるモータ11の動力をプランジャ35に伝達する伝達機構40を収容する金属製の伝達機構ハウジング23が設けられている。伝達機構ハウジング23はアルミニウム合金などの金属によって成形される単一部品である。伝達機構ハウジング23は、伝達機構40を収容する伝達機構収容部23aと、ステータ11aの外周に位置してステータ11aを支持するステータ支持部(被嵌合部)23bと、を備えている。詳細には、伝達機構収容部23aとステータ支持部23bとは一体に成形され、ステータ支持部23bは、伝達機構収容部23aからステータ11a側(下方側)に向けて延在する支持部である。したがって、伝達機構ハウジング23は、略L字形状のハウジングである。そして、伝達機構40が収容される伝達機構収容部23aは、メインハウジング12の本体部12h内に配置され、ステータ11aを支持するステータ支持部23bは、メインハウジング12のモータケース15内に配置される。詳細は後述するが、ステータ支持部23bはロータ11d及び回転軸11eに対して軸方向での位置決めを行うようにも構成されている。従ってステータ支持部23bは、モータ支持部とも言えるし、ロータ支持部とも言える。また、ハンドル14内の上端部には、トリガ20と連動して動作するトリガスイッチ20aが設けられ、さらに、モータケース15の下方に接続される装着部16内には、モータ11の駆動を制御するコントローラ(通電部)21が設けられている。トリガスイッチ20aとコントローラ21とは、ハンドル14及び装着部16のそれぞれの内部に亘って引き回された配線22によって電気的に接続されている。
Further, as shown in FIG. 2, the work machine 10 is provided with a metal transmission mechanism housing 23 that accommodates a transmission mechanism 40 that transmits the power of the motor 11 shown in FIG. The transmission housing 23 is a single piece molded from a metal such as an aluminum alloy. The transmission mechanism housing 23 includes a transmission mechanism accommodating portion 23a that accommodates the transmission mechanism 40, and a stator support portion (fitted portion) 23b that is positioned on the outer periphery of the stator 11a and supports the stator 11a. Specifically, the transmission mechanism housing portion 23a and the stator support portion 23b are formed integrally, and the stator support portion 23b is a support portion extending from the transmission mechanism housing portion 23a toward the stator 11a side (downward side). . Therefore, the transmission mechanism housing 23 is a substantially L-shaped housing. A transmission mechanism accommodating portion 23 a that accommodates the transmission mechanism 40 is arranged inside the main body portion 12 h of the main housing 12 , and a stator support portion 23 b that supports the stator 11 a is arranged inside the motor case 15 of the main housing 12 . be. Although the details will be described later, the stator support portion 23b is also configured to position the rotor 11d and the rotating shaft 11e in the axial direction. Therefore, the stator support portion 23b can be said to be a motor support portion, and can also be said to be a rotor support portion. A trigger switch 20a is provided at the upper end of the handle 14 and operates in conjunction with the trigger 20. Further, the mounting portion 16 connected to the lower side of the motor case 15 has a trigger switch 20a for controlling the driving of the motor 11. A controller (energization section) 21 is provided. The trigger switch 20a and the controller 21 are electrically connected by a wiring 22 routed inside the handle 14 and the mounting portion 16, respectively.
作業機10では、図2に示されるように、本体部12h内に伝達機構ハウジング23の伝達機構収容部23aが配置されるとともに、本体部12hの下方に接続されるモータケース15内に伝達機構ハウジング23のステータ支持部23bが配置される。一方、ハンドル14、装着部16及びモータケース15内に亘って配線22、コントローラ21及びステータ11a等の電装部品(通電部)が配置される。したがって、伝達機構ハウジング23が配置される領域である伝達機構ハウジング領域24と、コントローラ21及びステータ11a等の電装部品が配置される電装部品収容領域25とが、モータケース15内で重複している。別の表現で述べると、伝達機構ハウジング23は、ステータ11aまたはコントローラ21のうちの少なくとも何れか一方を含む通電部を覆っている(本実施の形態の作業機10では、ステータ11aが伝達機構ハウジング23のステータ支持部23bによって覆われている)。したがって、ステータ11aの少なくとも一部は、伝達機構ハウジング23によって覆われ、かつ、メインハウジング12によっても覆われている。さらに、伝達機構ハウジング23は、該伝達機構ハウジング23の全部がメインハウジング12によって覆われている。なお、伝達機構ハウジング領域24の一部と電装部品収容領域25の一部とが、モータケース15内で重複していることで、作業機10が大型化することを抑制できる。また、本実施の形態の場合、伝達機構ハウジング23の全部がメインハウジング12によって覆われているが、伝達機構ハウジング23の一部がメインハウジング12に覆われ、かつ他の部分が別のハウジングに収容されるように構成してもいいし、伝達機構ハウジング23の全部がメインハウジング12とは別部分(別部材)となる別ハウジングに収容されるように構成してもいい。なお、本実施の形態においては、伝達機構ハウジング23の全部がメインハウジング12によって覆われているため、部品点数の削減を図ることができる。
In the working machine 10, as shown in FIG. 2, the transmission mechanism accommodating portion 23a of the transmission mechanism housing 23 is arranged inside the main body portion 12h, and the transmission mechanism is arranged inside the motor case 15 connected to the lower side of the main body portion 12h. A stator support portion 23b of the housing 23 is arranged. On the other hand, electrical components (current-carrying parts) such as wiring 22, controller 21, stator 11a, etc. are arranged over handle 14, mounting part 16 and motor case 15. As shown in FIG. Therefore, a transmission mechanism housing area 24 in which the transmission mechanism housing 23 is arranged and an electrical component accommodation area 25 in which electrical components such as the controller 21 and the stator 11a are arranged overlap within the motor case 15. . In other words, the transmission mechanism housing 23 covers the current-carrying section including at least one of the stator 11a and the controller 21 (in the working machine 10 of the present embodiment, the stator 11a is the transmission mechanism housing). 23 is covered by the stator support 23b). Therefore, at least part of the stator 11 a is covered by the transmission mechanism housing 23 and also covered by the main housing 12 . Further, the transmission mechanism housing 23 is entirely covered with the main housing 12 . Since a portion of the transmission mechanism housing region 24 and a portion of the electrical component housing region 25 overlap within the motor case 15, it is possible to prevent the working machine 10 from increasing in size. Further, in the case of the present embodiment, the entire transmission mechanism housing 23 is covered with the main housing 12, but a portion of the transmission mechanism housing 23 is covered with the main housing 12 and the other portion is covered with another housing. The transmission mechanism housing 23 may be configured to be housed therein, or may be configured so that the entire transmission mechanism housing 23 is housed in a separate housing that is a separate portion (separate member) from the main housing 12 . In this embodiment, since the entire transmission mechanism housing 23 is covered with the main housing 12, the number of parts can be reduced.
図4に示されるように、伝達機構ハウジング23のステータ支持部23bには、ステータコイル11cが巻き付けられたステータコア11bと、絶縁部材からなるインシュレータ11hとを含むステータ11aが設けられている。また、ステータ11a(インシュレータ11h)には、モータ11(ロータ11dまたは回転軸11e)の回転位置を検出するためのホールICを搭載したセンサ基板21aが取り付けられる。従って、センサ基板21aは伝達機構ハウジング23(ステータ支持部23b)に保持されるように構成される。ロータ11dと一体的に回転するように構成された回転軸11eには上端部にピニオン(不図示)が設けられており、当該ピニオンがギヤ29と噛み合っている。回転軸11eは、上部が上側ベアリング27によって保持され、下部が下側ベアリング28によって保持されている。つまり、回転軸11eに設けられた下側ベアリング28は、樹脂製のベアリングホルダ26によって支持されている。また、モータ11の回転軸11eには、回転軸11eの径方向に空気を供給する遠心ファン(ファン)51が設けられている。遠心ファン(ファン)51のステータ11a側には、空気の流れをガイドするためのファンガイド50が設けられる。
As shown in FIG. 4, the stator support portion 23b of the transmission mechanism housing 23 is provided with a stator 11a including a stator core 11b around which a stator coil 11c is wound and an insulator 11h made of an insulating member. A sensor substrate 21a mounted with a Hall IC for detecting the rotational position of the motor 11 (rotor 11d or rotating shaft 11e) is attached to the stator 11a (insulator 11h). Accordingly, the sensor substrate 21a is configured to be held by the transmission mechanism housing 23 (the stator support portion 23b). A pinion (not shown) is provided at the upper end of the rotating shaft 11 e configured to rotate integrally with the rotor 11 d , and the pinion is meshed with the gear 29 . The rotary shaft 11e is held by an upper bearing 27 at its upper portion and by a lower bearing 28 at its lower portion. That is, the lower bearing 28 provided on the rotating shaft 11e is supported by a bearing holder 26 made of resin. A centrifugal fan (fan) 51 for supplying air in the radial direction of the rotating shaft 11e is provided on the rotating shaft 11e of the motor 11. As shown in FIG. A fan guide 50 is provided on the stator 11a side of the centrifugal fan (fan) 51 to guide the flow of air.
なお、モータ11の回転軸11eと噛み合うギヤ29は、伝達機構収容部23aに支持される回転軸30を中心に回転する。ギヤ29には、ギヤ29と一緒に回転するクランク34が設けられており、クランク34は、ギヤ29の回転とともに偏心回転する。また、クランク34には、プランジャ(出力部)35が設けられており、クランク34が偏心回転すると、プランジャ35が往復動する。さらに、プランジャ35の往復動により、プランジャ35の先端のブレード取付部19に取り付けられたブレード17が往復動する。プランジャ35の往復動は、本体部12h内に設けられた2つのローラ36によってガイドされる。
A gear 29 meshing with the rotating shaft 11e of the motor 11 rotates about a rotating shaft 30 supported by the transmission mechanism accommodating portion 23a. The gear 29 is provided with a crank 34 that rotates together with the gear 29, and the crank 34 rotates eccentrically as the gear 29 rotates. Further, the crank 34 is provided with a plunger (output portion) 35, and when the crank 34 rotates eccentrically, the plunger 35 reciprocates. Further, the reciprocating motion of the plunger 35 causes the blade 17 attached to the blade attachment portion 19 at the tip of the plunger 35 to reciprocate. The reciprocating motion of the plunger 35 is guided by two rollers 36 provided inside the body portion 12h.
また、クランク34の上側の端部には、カウンタウエイト37が設けられている。クランク34が偏心回転すると、カウンタウエイト37も往復動する。このとき、プランジャ35とカウンタウエイト37とは、互いに位相が180°ずれて動作するように設けられている。例えば、プランジャ35が前進すると、カウンタウエイト37は後退し、プランジャ35が後退すると、カウンタウエイト37は前進する。これにより、カウンタウエイト37は、プランジャ35の動作によって起こる振動を相殺している。
A counterweight 37 is provided at the upper end of the crank 34 . When the crank 34 rotates eccentrically, the counterweight 37 also reciprocates. At this time, the plunger 35 and the counterweight 37 are provided so as to operate 180 degrees out of phase with each other. For example, when the plunger 35 advances, the counterweight 37 retracts, and when the plunger 35 retracts, the counterweight 37 advances. Thereby, the counterweight 37 cancels out the vibration caused by the operation of the plunger 35 .
また、ギヤ29は、その下面に複数のスチールボール31が配置され、これら複数のスチールボール31はストラスワッシャ32によって支持されている。さらに、ストラスワッシャ32の下部にはダンパ33が設けられている。したがって、ギヤ29は反力を受けると傾くが、ダンパ33がその反力を吸収する構造となっており、ギヤ29が傾くことを抑制している。
A plurality of steel balls 31 are arranged on the lower surface of the gear 29 , and the plurality of steel balls 31 are supported by strut washers 32 . Furthermore, a damper 33 is provided below the strut washer 32 . Therefore, the gear 29 tilts when receiving a reaction force, but the damper 33 is structured to absorb the reaction force, thereby suppressing the gear 29 from tilting.
また、モータ11の回転軸11eとギヤ29とは、はすば歯車による噛み合いとなっており、プランジャ35に掛かる負荷が急激に大きくなると、回転軸11eには、上方に引っ張られるように力が付与されるように構成されている。作業機10では、モータ11の回転軸11eの下側の端部が下側ベアリング28を介してベアリングホルダ26によって支持されいるが、高負荷時においては回転軸11eが上方に引っ張られるためにベアリングホルダ26が下方向へ付勢されて外れることはなく、モータ11の支持構造が容易に分解されない構造となっている。
Further, the rotating shaft 11e of the motor 11 and the gear 29 are meshed by a helical gear. configured to be granted. In the work machine 10, the lower end of the rotating shaft 11e of the motor 11 is supported by the bearing holder 26 via the lower bearing 28, but when the load is high, the rotating shaft 11e is pulled upward, so the bearing The holder 26 is not disengaged by being biased downward, and the support structure for the motor 11 is structured so as not to be easily disassembled.
また、電池パック13には、複数の電池セル13aが内蔵されており、電池パック13からモータ11に電力が供給される。作業者によってハンドル14のトリガ20が操作されると、ハンドル14に内蔵されているトリガスイッチ20aが作動し、コントローラ21から切断動作のための電力が出力され、モータ11にモータ電流が供給される。これにより、モータ11が作動し、ギヤ29の回転によりクランク34が偏心回転すると、プランジャ35が往復動(前後動)する。その結果、プランジャ35の先端に取り付けられたブレード17が往復動(前後動)し、切断加工が実施される。モータ11はブラシレスモータであり、コントローラ21には、モータ11を制御するための複数のスイッチング素子(インバータ回路)や、スイッチング素子をオンオフ制御するための制御部(マイクロコントローラ)が搭載されている。
Further, the battery pack 13 contains a plurality of battery cells 13a and power is supplied from the battery pack 13 to the motor 11 . When the trigger 20 of the handle 14 is operated by the operator, the trigger switch 20a incorporated in the handle 14 is actuated, the power for the cutting operation is output from the controller 21, and the motor current is supplied to the motor 11. . As a result, the motor 11 operates, and when the crank 34 rotates eccentrically due to the rotation of the gear 29, the plunger 35 reciprocates (moves back and forth). As a result, the blade 17 attached to the tip of the plunger 35 reciprocates (moves back and forth) to perform cutting. The motor 11 is a brushless motor, and the controller 21 is equipped with a plurality of switching elements (inverter circuits) for controlling the motor 11 and a control section (microcontroller) for on/off controlling the switching elements.
次に、作業機10に組付けられる伝達機構ハウジング23の詳細構造について説明する。図5及び図6に示されるように、伝達機構ハウジング23は、上部に配置される伝達機構収容部23aと、下部に配置されるステータ支持部23bとが一体に形成された金属製のハウジングであり、箱状(容器状)に形成された伝達機構収容部23aと円環状(筒状)に形成されたステータ支持部23bとから構成されている。すなわち、伝達機構収容部23aとステータ支持部23bとはそれぞれ単一部品(伝達機構ハウジング23)の一部であり、分離不能に構成される。ステータ支持部23bは、伝達機構収容部23aから下方に向かって延びており、伝達機構収容部23aには伝達機構40が収容され、ステータ支持部23bにはステータ11aが支持される構造となっている。図5に示されるように、伝達機構収容部23aの側壁23cには複数のねじボス23dが設けられており、伝達機構ハウジング23は、これらねじボス23dにおいて後述する上部カバー49(図7参照)がねじ固定される。また、側壁23cには複数のリブ23c1が形成される。また、図6に示されるように、伝達機構収容部23aの底部には、モータ11の回転軸11eを支持する軸受部23jと、ギヤ29の回転軸30を支持する軸受部23kとが設けられている。軸受部23jは、回転軸11eが配置される円形のモータ軸用開口部23gを備え、軸受部23kは、回転軸30が配置される円形の伝達機構軸用開口部23hを備えている。軸受部23j及び軸受部23kには、それぞれの回転軸11e,30の径方向に延びる複数のリブ23e,23fが設けられており、円形のモータ軸用開口部23g及び円形の伝達機構軸用開口部23hのそれぞれの中心位置がずれないように高い精度で確保されている。
Next, the detailed structure of the transmission mechanism housing 23 assembled to the working machine 10 will be described. As shown in FIGS. 5 and 6, the transmission mechanism housing 23 is a metal housing integrally formed with a transmission mechanism accommodating portion 23a arranged in the upper portion and a stator support portion 23b arranged in the lower portion. It is composed of a box-shaped (container-shaped) transmission mechanism accommodating portion 23a and an annular (cylindrical)-shaped stator support portion 23b. That is, the transmission mechanism accommodating portion 23a and the stator support portion 23b are each part of a single component (the transmission mechanism housing 23) and are configured inseparably. The stator support portion 23b extends downward from the transmission mechanism housing portion 23a. The transmission mechanism housing portion 23a houses the transmission mechanism 40, and the stator support portion 23b supports the stator 11a. there is As shown in FIG. 5, a side wall 23c of the transmission mechanism accommodating portion 23a is provided with a plurality of screw bosses 23d. is screwed. A plurality of ribs 23c1 are formed on the side wall 23c. Further, as shown in FIG. 6, a bearing portion 23j that supports the rotating shaft 11e of the motor 11 and a bearing portion 23k that supports the rotating shaft 30 of the gear 29 are provided at the bottom of the transmission mechanism accommodating portion 23a. ing. The bearing portion 23j has a circular motor shaft opening 23g in which the rotary shaft 11e is arranged, and the bearing portion 23k has a circular transmission mechanism shaft opening 23h in which the rotary shaft 30 is arranged. The bearing portion 23j and the bearing portion 23k are provided with a plurality of ribs 23e and 23f extending in the radial direction of the respective rotating shafts 11e and 30, and have a circular motor shaft opening 23g and a circular transmission mechanism shaft opening. The center positions of the portions 23h are ensured with high accuracy so as not to shift.
次に、作業機10における伝達機構40の構造について図7を用いて詳細に説明する。伝達機構ハウジング23の伝達機構収容部23aには、伝達機構40として少なくともギヤ29と、ギヤ29に取り付けられた偏心回転するクランク34とが設けられる。また、クランク34には、出力部としてプランジャ35がスリーブ41を介して設けられている。詳細には、プランジャ35の孔部35aにスリーブ41を介してクランク34が係合しており、ギヤ29の回転によってクランク34が偏心回転すると、プランジャ35が往復動する。プランジャ35の先端にはOリング39を介してブレード取付部19が設けられ、さらに、ダストガード38に覆われた状態のブレード取付部19にブレード17が取り付けられている。プランジャ35は、その先端部がローラ36によってガイドされて往復動する。Oリング39は伝達機構ハウジング23の前端部分に形成された溝に嵌り込んで保持されている。
Next, the structure of transmission mechanism 40 in work machine 10 will be described in detail with reference to FIG. At least a gear 29 as a transmission mechanism 40 and an eccentrically rotating crank 34 attached to the gear 29 are provided in the transmission mechanism accommodating portion 23 a of the transmission mechanism housing 23 . Further, the crank 34 is provided with a plunger 35 as an output portion via a sleeve 41 . More specifically, the crank 34 is engaged with the hole 35a of the plunger 35 via the sleeve 41, and when the crank 34 rotates eccentrically due to the rotation of the gear 29, the plunger 35 reciprocates. A blade attachment portion 19 is provided at the tip of the plunger 35 via an O-ring 39 , and a blade 17 is attached to the blade attachment portion 19 covered with a dust guard 38 . The plunger 35 reciprocates with its tip portion guided by a roller 36 . The O-ring 39 is held in a groove formed in the front end portion of the transmission mechanism housing 23 .
ギヤ29の下面側には複数のスチールボール31が円形上に配置されており、これら複数のスチールボール31はストラスワッシャ32によって支持されるとともに、ギヤ29の下面に接触している。さらに、ストラスワッシャ32の下部にはダンパ33が設けられている。これにより、ギヤ29が受ける反力をダンパ33によって吸収し、ギヤ29が傾斜することを抑制できる。
A plurality of steel balls 31 are arranged in a circle on the lower surface side of the gear 29 . These steel balls 31 are supported by strut washers 32 and are in contact with the lower surface of the gear 29 . Furthermore, a damper 33 is provided below the strut washer 32 . As a result, the damper 33 absorbs the reaction force that the gear 29 receives, and the inclination of the gear 29 can be suppressed.
プランジャ35は、ボルト35bを介して取り付けられるガイド部材42上を往復動可能なように、左右両側に配置されたガイド部材42によって支持されている。ガイド部材42の内側には、溝が形成されており、この溝にプランジャ35の側部が入り込んでいる。これにより、プランジャ35は、往復動(前後動)可能なように左右のガイド部材42によって支持されている。
The plunger 35 is supported by guide members 42 arranged on both left and right sides so as to be able to reciprocate on guide members 42 attached via bolts 35b. A groove is formed inside the guide member 42, and the side portion of the plunger 35 is inserted into this groove. Thereby, the plunger 35 is supported by the left and right guide members 42 so as to be able to reciprocate (back and forth).
また、クランク34の上側の端部には、プランジャ35と180°位相がずれて動作するカウンタウエイト37が設けられている。すなわち、クランク34が偏心回転すると、カウンタウエイト37も往復動し、これにより、カウンタウエイト37は、プランジャ35の動作による振動を相殺している。カウンタウエイト37は、左右両側に配置された金属製のガイド46によって往復動可能なように支持されており、それぞれのガイド46は、ゴム製のダンパ47で支持されている。これにより、カウンタウエイト37の移動時の振動は、ダンパ47によって吸収される。また、左右のガイド46は、それぞれスペーサ43によって支持されており、さらに、プランジャ35のガイド部材42を押さえ付けるメタルプレート44が上方からボルト44aによって締め付けられて固定されている。カウンタウエイト37は、該カウンタウエイト37の側面に形成された溝部37bに配置される複数のスチールボール45を介してガイド46によって支持されている。すなわち、カウンタウエイト37の左右両側に設けられたガイド46との間に複数のスチールボール45が挟み込まれており、これら複数のスチールボール45を介してガイド46によって往復動(前後動)可能なように支持されている。また、カウンタウエイト37の上面の孔部37aにも複数のスチールボール45が配置されており、これら複数のスチールボール45は、伝達機構ハウジング23の上部カバー49によって押圧されている。すなわち、伝達機構ハウジング23の上部カバー49を枠状のシール材48を介して複数のボルト49aによって固定すると、カウンタウエイト37の上面に配置された複数のスチールボール45は、上部カバー49に接触し、これにより、カウンタウエイト37は位置決めされる。
A counterweight 37 is provided at the upper end of the crank 34 and operates 180 degrees out of phase with the plunger 35 . That is, when the crank 34 rotates eccentrically, the counterweight 37 also reciprocates, so that the counterweight 37 cancels the vibration caused by the operation of the plunger 35 . The counterweight 37 is reciprocally supported by metal guides 46 arranged on both left and right sides, and each guide 46 is supported by a rubber damper 47 . As a result, the damper 47 absorbs the vibration of the counterweight 37 when it moves. The left and right guides 46 are supported by spacers 43, respectively, and a metal plate 44 for pressing the guide member 42 of the plunger 35 is tightened from above by bolts 44a. The counterweight 37 is supported by guides 46 via a plurality of steel balls 45 arranged in grooves 37b formed on the side surfaces of the counterweight 37. As shown in FIG. That is, a plurality of steel balls 45 are sandwiched between guides 46 provided on both left and right sides of the counterweight 37, and the guides 46 can reciprocate (forward and backward) through the plurality of steel balls 45. supported by A plurality of steel balls 45 are also arranged in the holes 37 a on the upper surface of the counterweight 37 , and these steel balls 45 are pressed by the upper cover 49 of the transmission mechanism housing 23 . That is, when the upper cover 49 of the transmission mechanism housing 23 is fixed with a plurality of bolts 49a via a frame-shaped sealing member 48, the plurality of steel balls 45 arranged on the upper surface of the counterweight 37 come into contact with the upper cover 49. , thereby positioning the counterweight 37 .
以上のように作業機10では、金属製の伝達機構ハウジング23によって直接ステータ11aを支持するため、伝達機構ハウジング23に対するステータ11aの位置精度を確保することができる。これにより、ハウジングの組付けにおいて高い組付け精度を必要とすることがなく、組付けを容易に行うことができる。
As described above, in the work machine 10, the stator 11a is directly supported by the transmission mechanism housing 23 made of metal. Accordingly, assembly of the housing can be easily performed without requiring high assembly accuracy.
また、伝達機構40を収容する伝達機構収容部23aと、ステータ11aを支持するステータ支持部23bとが一体に成形されているため、これら2つのハウジングを組付けるためのねじが不要になる。したがって、ねじボスの数も削減できるため、ねじボスを設けることによる作業機10の大型化を抑制することができる。さらに、ねじの本数を減らすことができるため、作業機10のコスト低減化を図ることができる。
Further, since the transmission mechanism accommodating portion 23a that accommodates the transmission mechanism 40 and the stator support portion 23b that supports the stator 11a are integrally molded, screws for assembling these two housings are not required. Therefore, since the number of screw bosses can also be reduced, it is possible to suppress an increase in the size of work machine 10 due to the provision of screw bosses. Furthermore, since the number of screws can be reduced, cost reduction of the work machine 10 can be achieved.
ステータ支持部23bは、伝達機構収容部23aから下方(ステータ11a側)に延在する複数の延在部23b1と、2つの延在部23b1を相互に接続する接続部23b2と、延在部23b1と接続部23b2とで囲われる開口部23b3と、延在部23b1の外側部分に設けられるリブ23b4と、延在部23b1の内側に設けられる被嵌合部23b5と、を有する。延在部23b1は伝達機構ハウジング23の左側に2つ、右側に2つの計4つ形成されている。接続部23b2は、左側または右側に位置する前後方向に離間した2つの延在部23b1の下端に接続されるものである。接続部23b2は略円弧状(部分的な円環状)に形成される。開口部23b3はステータ支持部23bの内部と外部とを連通する空間である。開口部23b3は遠心ファン51から送られる空気の通り道となる。また、開口部23b3は、延在部23b1と接続部23b2とで囲われる回転軸11eと平行な方向に沿って延びる開口(空間)である。開口部23b3は、伝達機構ハウジング23の重量を低減させるための減肉部としても機能する。リブ23b4はメインハウジング12と係合する部分である。リブ23b4は、延在部23b1が左右方向に撓みにくくする補強リブとしての機能も有する。被嵌合部23b5は、延在部23b1において外側に向かって凹む部分であり、ステータ11aと直接または間接的に嵌合(係合)する部分である。凹となる被嵌合部23b5によって、被嵌合部23b5の上端部には段差が発生し、この部分が後述するファンガイド50が突き当たる突き当て部23b6となる。突き当て部23b6は4つある延在部23b1のそれぞれに設けられる。
The stator support portion 23b includes a plurality of extension portions 23b1 extending downward (toward the stator 11a) from the transmission mechanism housing portion 23a, a connection portion 23b2 connecting the two extension portions 23b1, and an extension portion 23b1. and a connecting portion 23b2, a rib 23b4 provided on the outer side of the extending portion 23b1, and a fitted portion 23b5 provided on the inner side of the extending portion 23b1. A total of four extending portions 23b1 are formed, two on the left side of the transmission mechanism housing 23 and two on the right side. The connection portion 23b2 is connected to the lower ends of the two extending portions 23b1 located on the left side or the right side and spaced apart in the front-rear direction. The connecting portion 23b2 is formed in a substantially arc shape (partially annular shape). The opening 23b3 is a space that communicates the inside and the outside of the stator support portion 23b. The opening 23b3 serves as a path for air sent from the centrifugal fan 51. As shown in FIG. The opening 23b3 is an opening (space) surrounded by the extending portion 23b1 and the connecting portion 23b2 and extending in a direction parallel to the rotating shaft 11e. The opening 23 b 3 also functions as a thinned portion for reducing the weight of the transmission mechanism housing 23 . The rib 23b4 is a portion that engages with the main housing 12. As shown in FIG. The rib 23b4 also functions as a reinforcing rib that makes it difficult for the extending portion 23b1 to bend in the left-right direction. The fitted portion 23b5 is a portion of the extending portion 23b1 that is recessed toward the outside, and is a portion that fits (engages) with the stator 11a directly or indirectly. Due to the recessed fitted portion 23b5, a step is generated at the upper end portion of the fitted portion 23b5, and this portion serves as an abutment portion 23b6 against which a fan guide 50 (to be described later) abuts. The abutting portion 23b6 is provided on each of the four extending portions 23b1.
次に、図8~図10を用いてステータ11a及びロータ11d(回転軸部)の伝達機構ハウジング23のステータ支持部23bへの組付けについて説明する。まず、ロータ11dと、回転軸11eと、遠心ファン51と、ベアリング27と、ベアリング28とを(回転軸部として)ユニット化する。次に、ユニット化された状態のベアリング27を伝達機構ハウジング23に取り付ける。こうして、ロータ11dと、回転軸11eと、遠心ファン51とが伝達機構ハウジング23に保持される。次に、ステータ11aの外周にファンガイド(位置決め部材)50を嵌合させた状態で、ステータ支持部23bの下方側からファンガイド50と被嵌合部23b5に嵌め込む。つまり、ステータ11aは、モータ11の回転軸11eに沿った方向(上下方向)に挿入されてステータ支持部23b(被嵌合部23b5)と嵌合される。具体的には、遠心ファン51によって発生する空気流のガイドとなるリング状のファンガイド50が有する4本の支持部50aが、ステータ支持部23b(被嵌合部23b5)の内側に圧入によって嵌め込まれ、ステータ支持部23bに嵌合したファンガイド50(支持部50a)にステータ11aが嵌合するように構成される。このため、ファンガイド50の支持部50aの外側の表面(上端)には、ステータ支持部23bに嵌め込み易いように面取り部50cが形成されている。また、リング状のファンガイド50には、その一部に風路用の切欠部50bが形成されている。図10に示すように、ステータ支持部23b(被嵌合部23b5)に挿入(嵌合)されたファンガイド50はステータ支持部23bの突き当て部23b6に当接し、これによって上方向の移動を規制される。
Next, assembly of the stator 11a and the rotor 11d (rotary shaft portion) to the stator support portion 23b of the transmission mechanism housing 23 will be described with reference to FIGS. 8 to 10. FIG. First, the rotor 11d, the rotating shaft 11e, the centrifugal fan 51, the bearing 27, and the bearing 28 are unitized (as a rotating shaft portion). Next, the unitized bearing 27 is attached to the transmission mechanism housing 23 . Thus, the rotor 11 d , the rotating shaft 11 e and the centrifugal fan 51 are held by the transmission mechanism housing 23 . Next, with the fan guide (positioning member) 50 fitted to the outer periphery of the stator 11a, the fan guide 50 and the fitted portion 23b5 are fitted from the lower side of the stator support portion 23b. That is, the stator 11a is inserted in the direction (vertical direction) along the rotating shaft 11e of the motor 11 and fitted with the stator support portion 23b (fitted portion 23b5). Specifically, the four support portions 50a of the ring-shaped fan guide 50 that guides the air flow generated by the centrifugal fan 51 are press-fitted inside the stator support portion 23b (fitted portion 23b5). The stator 11a is fitted to the fan guide 50 (supporting portion 50a) fitted to the stator supporting portion 23b. For this reason, a chamfered portion 50c is formed on the outer surface (upper end) of the support portion 50a of the fan guide 50 so that it can be easily fitted into the stator support portion 23b. The ring-shaped fan guide 50 is partially formed with a notch 50b for an air passage. As shown in FIG. 10, the fan guide 50 inserted (fitted) into the stator support portion 23b (fitted portion 23b5) abuts against the abutting portion 23b6 of the stator support portion 23b, thereby preventing upward movement. Regulated.
ファンガイド50の支持部50aとステータ11aをステータ支持部23bの内側に嵌め込んだ後、樹脂製のベアリングホルダ26を下方側から円環状のステータ支持部23bの内側に嵌め込む。このとき、ベアリングホルダ26の支持部26aの外側の表面にも、ステータ支持部23b(被嵌合部23b5)に嵌め込み易いように面取り部26bが形成されている。以上のようにステータ支持部23bは、ファンガイド50の支持部50aとベアリングホルダ26の支持部26aとに被さるように設けられている。ここで、伝達機構ハウジング23とステータコア11bは両方とも金属であり、伝達機構ハウジング23にステータコア11bを直接圧入する場合、金属同士の嵌め合いとなるため、手でステータコア11bをステータ支持部23bに挿入することが困難となる場合がある。ファンガイド50の支持部50aとベアリングホルダ26の支持部26aとはそれぞれ樹脂製であり、伝達機構ハウジング23やステータコア11bと比較して潰れやすく形成することが容易である。本実施の形態の場合、ステータ支持部23b(伝達機構ハウジング23)とステータ11aとの間に樹脂製の位置決め部材(ファンガイド50)を介在させたため、当該位置決め部材を潰すことで容易に圧入が可能となり、人間の手によってステータコア11bをステータ支持部23bに挿入することが容易となる。さらに、面取り部50c,26bが形成されているため、ステータ支持部23bとの嵌合を滑らかに行うことができる。また、本実施の形態の場合では、電気的な絶縁性を有する(樹脂製の)位置決め部材をステータ11aと伝達機構ハウジング23(ステータ支持部23b)の間に介在させている。言い換えると、ステータ11aは絶縁部材を介して伝達機構ハウジング23に支持されている。より詳細には、絶縁性を有するファンガイド50がステータ11aと伝達機構ハウジング23の間に介在している。こうすることで、伝達機構ハウジング23でステータ11aを支持しながら、通電部分を有するステータ11aと金属である伝達機構ハウジング23との間を電気的に絶縁することができる。また、ステータ11aをステータ支持部23bと嵌合(圧入)させることで、ステータ支持部23bの延在部23b1は、回転軸11eを中心とした放射方向(前後左右方向に延びる平面に沿った方向)に付勢されるため、この方向に変形しようとするが、接続部23b2が延在部23b1同士を接続しているため、延在部23b1同士が相対的に離間することを抑制し、これによって延在部23b1(被嵌合部23b5)がステータ11aから離間することを抑制することができる。
After the support portion 50a of the fan guide 50 and the stator 11a are fitted inside the stator support portion 23b, the bearing holder 26 made of resin is fitted inside the annular stator support portion 23b from below. At this time, a chamfered portion 26b is also formed on the outer surface of the support portion 26a of the bearing holder 26 so that it can be easily fitted into the stator support portion 23b (fitted portion 23b5). As described above, the stator support portion 23 b is provided so as to cover the support portion 50 a of the fan guide 50 and the support portion 26 a of the bearing holder 26 . Here, both the transmission mechanism housing 23 and the stator core 11b are made of metal, and when the stator core 11b is directly press-fitted into the transmission mechanism housing 23, the metals are fitted together. can be difficult to do. The support portion 50a of the fan guide 50 and the support portion 26a of the bearing holder 26 are each made of resin, and are easily crushable compared to the transmission mechanism housing 23 and the stator core 11b. In the case of the present embodiment, since the resin positioning member (fan guide 50) is interposed between the stator support portion 23b (transmission mechanism housing 23) and the stator 11a, press fitting can be easily performed by crushing the positioning member. This makes it easier for a person to manually insert the stator core 11b into the stator support portion 23b. Furthermore, since the chamfered portions 50c and 26b are formed, fitting with the stator support portion 23b can be performed smoothly. In the case of the present embodiment, an electrically insulating (made of resin) positioning member is interposed between the stator 11a and the transmission mechanism housing 23 (stator support portion 23b). In other words, the stator 11a is supported by the transmission mechanism housing 23 via an insulating member. More specifically, an insulating fan guide 50 is interposed between the stator 11 a and the transmission mechanism housing 23 . In this way, while the transmission mechanism housing 23 supports the stator 11a, it is possible to electrically insulate between the stator 11a having the conducting portion and the transmission mechanism housing 23 made of metal. In addition, by fitting (pressing) the stator 11a into the stator support portion 23b, the extension portion 23b1 of the stator support portion 23b moves radially around the rotation shaft 11e (a direction along a plane extending in the front, rear, left, and right directions). ), it tries to deform in this direction, but since the connecting portion 23b2 connects the extending portions 23b1, the extending portions 23b1 are restrained from being relatively separated from each other. Thus, the extension portion 23b1 (fitted portion 23b5) can be prevented from being separated from the stator 11a.
ステータ11aをステータ支持部23bと嵌合させた後、ベアリングホルダ26を下方側からステータ支持部23bの内側に嵌め込むと、ベアリングホルダ26の支持部26aの上端部とステータコア11bとが突き当たる(図10参照)。これにより、ベアリングホルダ26が位置決めされ、その結果、ステータ11aのステータ支持部23bへの位置決めが成される。また、この嵌め込みによってベアリングホルダ26にはベアリング28が嵌合し、これによって回転軸11eとベアリング28が軸方向で位置決めされる。すなわち、ステータ支持部23bによって保持されるベアリングホルダ26によって、ベアリング28が保持され、回転軸11eの軸方向及び径方向の位置決めが成される。
After fitting the stator 11a with the stator support portion 23b, when the bearing holder 26 is fitted into the stator support portion 23b from below, the upper end portion of the support portion 26a of the bearing holder 26 abuts against the stator core 11b (Fig. 10). Thereby, the bearing holder 26 is positioned, and as a result, the stator 11a is positioned to the stator support portion 23b. Moreover, the bearing 28 is fitted into the bearing holder 26 by this fitting, whereby the rotating shaft 11e and the bearing 28 are axially positioned. That is, the bearing 28 is held by the bearing holder 26 held by the stator support portion 23b, and the rotation shaft 11e is positioned in the axial and radial directions.
以上のように作業機10では、ステータ11aの外周部にステータ11aを位置決めする位置決め部材が設けられており、ステータ11aは、上記位置決め部材を介して伝達機構ハウジング23のステータ支持部23bによって支持される。そして、作業機10では、ステータ11aの位置決め部材として、遠心ファン51のガイドとなるファンガイド50及び下側ベアリング28を保持するベアリングホルダ26が設けられている。すなわち、ステータ11aは、ねじ等の固定具を使用することなく伝達機構ハウジング23のステータ支持部23bによって支持される。言い換えると、ステータ11aは、伝達機構ハウジング23のステータ支持部23bにより嵌合によって支持される。ステータ11aの位置決め部材として、ファンガイド50やベアリングホルダ26を利用することにより、部品を兼用することができ、作業機10のコスト低減化を図ることができる。また、ステータ11aや伝達機構ハウジング23に回り止め構造を設ける必要がなく、モータ周りの構造を容易にすることができる。なお、上側ベアリング27は、ベアリングロック27aによって動かないように固定され、下側ベアリング28は、ベアリングロック28aによって動かないように固定されている。なお、圧入やベアリングロックによって、ステータ11aと回転軸部(ロータ11d、回転軸11eなど)は軸方向(上下方向)に関してある程度の保持力によって伝達機構ハウジング23に保持されるが、強い力で下方向に付勢されるとステータ支持部23bから脱落するようになっている。すなわち、この段階(メインハウジング12に収容される前)では、ステータ11aと回転軸部(ロータ11d、回転軸11eなど)は下方向に強く引っ張れば伝達機構ハウジング23から抜けてしまう。本願では下記のように、ステータ11aと回転軸部(ロータ11d、回転軸11eなど)の軸方向に関する移動の規制をメインハウジング12によって行う。
As described above, in the work machine 10, a positioning member for positioning the stator 11a is provided on the outer peripheral portion of the stator 11a, and the stator 11a is supported by the stator support portion 23b of the transmission mechanism housing 23 via the positioning member. be. In the work machine 10, a fan guide 50 that serves as a guide for the centrifugal fan 51 and a bearing holder 26 that holds the lower bearing 28 are provided as positioning members for the stator 11a. That is, the stator 11a is supported by the stator support portion 23b of the transmission mechanism housing 23 without using fasteners such as screws. In other words, the stator 11a is supported by the stator support portion 23b of the transmission mechanism housing 23 by fitting. By using the fan guide 50 and the bearing holder 26 as positioning members for the stator 11a, the parts can be shared, and the cost of the work machine 10 can be reduced. Further, there is no need to provide a detent structure for the stator 11a or the transmission mechanism housing 23, and the structure around the motor can be simplified. The upper bearing 27 is fixed by a bearing lock 27a, and the lower bearing 28 is fixed by a bearing lock 28a. The stator 11a and the rotating shaft (rotor 11d, rotating shaft 11e, etc.) are held in the transmission mechanism housing 23 by a certain amount of holding force in the axial direction (vertical direction) by press-fitting or bearing locking. When it is urged in the direction, it is detached from the stator support portion 23b. That is, at this stage (before being housed in the main housing 12), the stator 11a and the rotary shaft (rotor 11d, rotary shaft 11e, etc.) can be pulled out of the transmission mechanism housing 23 if they are strongly pulled downward. In the present application, as described below, the main housing 12 regulates axial movement of the stator 11a and the rotating shaft portion (rotor 11d, rotating shaft 11e, etc.).
ベアリングホルダ26を嵌め込んだ後、図3に示される右側メインハウジング12cと左側メインハウジング12dを組付けると、図10に示されるように、ベアリングホルダ26の下側にメインハウジング12の内壁に設けられた支持部12fが入り込む。すなわち、メインハウジング12の支持部12fがベアリングホルダ26の下端に突き当たる。これにより、ベアリングホルダ26が下方側に抜けなくなる(下方向への移動が規制される)。ここで、メインハウジング12の支持部12fは、ステータ11aが伝達機構40から離間する方向(下方側に向かう方向)に移動することを規制する規制部である。また、ステータ支持部23bの下端部も支持部12fに当接する。したがって、右側メインハウジング12cと左側メインハウジング12dを組付けると、ベアリングホルダ26がメインハウジング12の支持部12fによって下側から支持されるとともに、伝達機構ハウジング23もメインハウジング12の支持部12e,12iによって支持される。なお、ベアリングホルダ26は回転軸11eを支持するベアリング28を軸方向で支持するとともに、下から上に向かってステータ11a(ステータコア11b)を軸方向で支持する。従って、ベアリングホルダ26が下方へ移動しないように規制されると、回転軸11eとステータ11aの下方向への移動も規制される。言い換えると、右側メインハウジング12cと左側メインハウジング12dを組付けることで、ステータ11aとロータ11dの位置固定が完了する。さらに、別の表現をすると、右側メインハウジング12cと左側メインハウジング12dとを組付けるためのねじによって、ステータ11aの伝達機構ハウジング23に対する固定が成される。
After fitting the bearing holder 26, when the right side main housing 12c and the left side main housing 12d shown in FIG. 3 are assembled, as shown in FIG. The support portion 12f that has been pushed in is entered. That is, the support portion 12f of the main housing 12 abuts against the lower end of the bearing holder 26. As shown in FIG. As a result, the bearing holder 26 does not come off downward (downward movement is restricted). Here, the support portion 12f of the main housing 12 is a restricting portion that restricts movement of the stator 11a in the direction away from the transmission mechanism 40 (the downward direction). The lower end of the stator support portion 23b also abuts on the support portion 12f. Therefore, when the right main housing 12c and the left main housing 12d are assembled, the bearing holder 26 is supported from below by the support portion 12f of the main housing 12, and the transmission mechanism housing 23 is also supported by the support portions 12e and 12i of the main housing 12. Supported by The bearing holder 26 axially supports a bearing 28 that supports the rotating shaft 11e, and axially supports the stator 11a (stator core 11b) from bottom to top. Therefore, when the bearing holder 26 is restricted from moving downward, the downward movement of the rotating shaft 11e and the stator 11a is also restricted. In other words, by assembling the right main housing 12c and the left main housing 12d, fixing the positions of the stator 11a and the rotor 11d is completed. In other words, the stator 11a is fixed to the transmission mechanism housing 23 by screws for assembling the right main housing 12c and the left main housing 12d.
次に、作業機10におけるステータ11aの回り止めについて説明する。図11は、支持部12fの下側の位置における、ステータ支持部23b周辺の前後左右方向の断面を下から見た図である。図11に示されるように、ステータ11aの外周部には、その周方向の4箇所に外側に向けて突出した凸部11fが形成されている。これら4箇所の凸部11fそれぞれに対してファンガイド50の支持部50aが被さるように嵌合し、図11中における時計回り方向及び反時計回り方向で係合している(回り止め部S2)。さらに、4箇所の支持部50aそれぞれにおいて、それぞれの支持部50aに被さるように伝達機構ハウジング23のステータ支持部23bが嵌合し、図11中における時計回り方向及び反時計回り方向で係合している。これにより、ファンガイド50が伝達機構ハウジング23によって回り止めされるとともに、ステータ11aがファンガイド50によって回り止めされる。また、延在部23b1の外側に設けられるリブ23b4が支持部12f(の凹部)に係合することで、メインハウジング12に対する伝達機構ハウジング23の回り止めも行われる。リブ23b4は4つある延在部23b1のそれぞれに設けられており、左右2か所ずつの計4か所で支持部12fと係合する。
Next, detents of the stator 11a in the work machine 10 will be described. FIG. 11 is a bottom view of a section around the stator support portion 23b in the front, rear, left, and right directions at a position below the support portion 12f. As shown in FIG. 11, the outer peripheral portion of the stator 11a is formed with four protrusions 11f projecting outward in the circumferential direction. The support portion 50a of the fan guide 50 is fitted so as to cover each of these four projections 11f, and is engaged in the clockwise and counterclockwise directions in FIG. 11 (rotation prevention portion S2). . Furthermore, the stator support portion 23b of the transmission mechanism housing 23 is fitted so as to cover the four support portions 50a at each of the four support portions 50a, and engages in the clockwise and counterclockwise directions in FIG. ing. As a result, the fan guide 50 is prevented from rotating by the transmission mechanism housing 23 and the stator 11a is prevented from rotating by the fan guide 50 . Further, the rotation of the transmission mechanism housing 23 with respect to the main housing 12 is also prevented by engaging the rib 23b4 provided on the outside of the extension portion 23b1 with (the concave portion of) the support portion 12f. The ribs 23b4 are provided on each of the four extending portions 23b1, and are engaged with the support portion 12f at a total of four locations, two on each side.
また、ファンガイド50には突起部50dが設けられるとともに、ステータ11aの外周部に凹部11gが設けられ、突起部50dが凹部11gに嵌合することで、ステータ11aのファンガイド50に対する回り止めを行うとともに、ステータ11aのファンガイド50に対する誤組を防止することができる(回り止め部S1)。
The fan guide 50 is provided with a protrusion 50d, and a recess 11g is provided on the outer periphery of the stator 11a. In addition, it is possible to prevent the stator 11a from being incorrectly assembled with respect to the fan guide 50 (the anti-rotation portion S1).
次に、作業機10におけるベアリングホルダ26の回り止めについて説明する。図12は、ベアリング28のすぐ上の位置における前後左右方向の断面を下から見た図である。図12に示されるように、ベアリングホルダ26の4箇所の支持部26aのそれぞれには、面取り部26bが形成されている。一方、伝達機構ハウジング23のステータ支持部23bの周方向の支持部26aに対応する4箇所(被嵌合部23b5)には、突起部23b7が形成されており、ベアリングホルダ26の支持部26aとステータ支持部23bの突起部23b7とが、4箇所(回り止め部S3)で係合することにより、ベアリングホルダ26を回り止めすることができる。より詳細には、回転軸11eに対して前左と後右の突起部23b7がベアリングホルダ26の図12中の時計回り方向の回転を規制し、回転軸11eに対して前右と後左の突起部23b7がベアリングホルダ26の図12中の反時計回り方向の回転を規制する。
Next, the anti-rotation of the bearing holder 26 in the work machine 10 will be described. FIG. 12 is a bottom view of a cross section in the front, rear, left, and right directions at a position just above the bearing 28. FIG. As shown in FIG. 12, a chamfered portion 26b is formed on each of the four support portions 26a of the bearing holder 26. As shown in FIG. On the other hand, projections 23b7 are formed at four locations (fitted portions 23b5) corresponding to the circumferential support portions 26a of the stator support portion 23b of the transmission mechanism housing 23. The rotation of the bearing holder 26 can be prevented by engaging the protrusions 23b7 of the stator support portion 23b at four locations (rotation prevention portions S3). More specifically, the front left and rear right protrusions 23b7 with respect to the rotation shaft 11e restrict the clockwise rotation of the bearing holder 26 in FIG. The protrusion 23b7 restricts the counterclockwise rotation of the bearing holder 26 in FIG.
次に、作業機10における冷却用風路について説明する。図13に示されるように、モータ11の回転軸11eに設けられた遠心ファン51の回転により、遠心ファン51の下方に負圧が発生し、作業機10の内部に空気(外気)が取り込まれる。具体的には、空気は、メインハウジング12の吸気口15aから取り込まれ(風路52)、主にステータ11aの内側を通過し遠心ファン51に至る。そして、遠心ファン51に至った空気は遠心ファン51によって径方向外方に送風される。遠心ファン51によって径方向外方に送風された空気は、メインハウジング12の内壁に当たって移動方向がガイドされる。ここで、遠心ファン51の下方には、支持部12iとファンガイド50が設けられているため、メインハウジング12の内壁に当たった空気が下方向へ流れることが抑制される。従って、メインハウジング12の内壁に当たった空気は、主として上方向に流れる。遠心ファン51から送風されて上方向に流れる空気は、伝達機構ハウジング23の側面を通過した後、メインハウジング12の排気口15bから外部に抜ける(風路54)。伝達機構収容部23aの左右方向外側の空間は、隔壁12gによって前後方向で区画されるため、遠心ファン51から送風された空気は前方に流れて行かないように構成される。また、ファンガイド50には切欠部50bが形成されているため、切欠部50bを介してステータ11aの外周を通る空気を遠心ファン51に流入させることができる(風路53)。
Next, the cooling air passage in work machine 10 will be described. As shown in FIG. 13, the rotation of the centrifugal fan 51 provided on the rotating shaft 11e of the motor 11 generates a negative pressure below the centrifugal fan 51, and air (outside air) is taken into the working machine 10. . Specifically, air is taken in from the intake port 15 a of the main housing 12 (air passage 52 ), mainly passes through the inside of the stator 11 a and reaches the centrifugal fan 51 . Then, the air reaching the centrifugal fan 51 is blown radially outward by the centrifugal fan 51 . The air blown radially outward by the centrifugal fan 51 hits the inner wall of the main housing 12 and is guided in the moving direction. Here, since the support portion 12i and the fan guide 50 are provided below the centrifugal fan 51, the air hitting the inner wall of the main housing 12 is suppressed from flowing downward. Therefore, the air hitting the inner wall of the main housing 12 mainly flows upward. The air that is blown upward by the centrifugal fan 51 passes through the side surface of the transmission mechanism housing 23 and then exits through the exhaust port 15b of the main housing 12 (air passage 54). The space outside the transmission mechanism accommodating portion 23a in the left-right direction is partitioned in the front-rear direction by the partition wall 12g, so that the air blown from the centrifugal fan 51 does not flow forward. Further, since the fan guide 50 is formed with the notch 50b, the air passing through the outer periphery of the stator 11a can flow into the centrifugal fan 51 through the notch 50b (air passage 53).
ここで、ステータ支持部23bによって覆われる遠心ファン51から伝達機構ハウジング23の外側へ空気を流すためには、空気の通り道が必要となる。そこで、本実施の形態では、径方向(左右方向)に貫通する開口となる開口部23b3をステータ支持部23bに設けている。例えば、ステータ支持部23bを穴のない筒形状とした場合、伝達機構ハウジング23の外側に空気を流すことが難しくなるが、本実施の形態の場合、開口部23b3によって空気の通り道を作ることができる。特に、開口部23b3は遠心ファン51の径方向外側に位置しているため、遠心ファン51からの空気はすぐに伝達機構ハウジング23の外部に送られるので、空気の流れが円滑になる。なお、遠心ファン51からの空気が最初に伝達機構ハウジング23の内部を通り、その後貫通穴などを介して伝達機構ハウジング23の外部に排出されるように構成してもよい。この場合、例えば遠心ファン51の上方に空気の通り道となる貫通穴を設けることが想定されるが、ステータ支持部23bのすぐ上に潤滑剤(グリス)が充填される伝達機構収容部23aが位置するため、ステータ支持部23b(ステータ11a)の位置を少し下側にオフセットさせる必要があり、本体の大型化を招く可能性がある。従って、開口部23b3を遠心ファン51の径方向外側に位置させる本願形態が作業機においてはより好適である。
Here, an air passage is required to allow air to flow from the centrifugal fan 51 covered by the stator support portion 23b to the outside of the transmission mechanism housing 23 . Therefore, in the present embodiment, the stator support portion 23b is provided with an opening portion 23b3 that is an opening penetrating in the radial direction (horizontal direction). For example, if the stator support portion 23b has a tubular shape without a hole, it becomes difficult to flow air to the outside of the transmission mechanism housing 23, but in the case of the present embodiment, it is possible to create an air passage by the opening portion 23b3. can. In particular, since the opening 23b3 is positioned radially outward of the centrifugal fan 51, the air from the centrifugal fan 51 is immediately sent to the outside of the transmission mechanism housing 23, so that the air flows smoothly. Alternatively, the air from the centrifugal fan 51 may first pass through the transmission mechanism housing 23 and then be discharged to the outside of the transmission mechanism housing 23 through a through hole or the like. In this case, for example, it is assumed that a through hole serving as an air passage is provided above the centrifugal fan 51, but the transmission mechanism accommodating portion 23a filled with lubricant (grease) is positioned immediately above the stator support portion 23b. Therefore, it is necessary to offset the position of the stator support portion 23b (stator 11a) slightly downward, which may lead to an increase in the size of the main body. Therefore, the configuration of the present application in which the opening 23b3 is positioned radially outward of the centrifugal fan 51 is more suitable for the working machine.
これにより、ステータ11a及び伝達機構ハウジング23を冷却することができる。なお、吸気口15a及び排気口15bは、右側メインハウジング12cと左側メインハウジング12dのそれぞれに設けられており、ステータ11a及び伝達機構ハウジング23のそれぞれの左右両側に冷却風を供給することができる。また、伝達機構ハウジング23の側壁23cには、複数のリブ23c1が形成されており、これが放熱フィンとして機能するとともに、リブ23c1の外側を空気が流れるので、伝達機構ハウジング23を好適に冷却することができる。
Thereby, the stator 11a and the transmission mechanism housing 23 can be cooled. The intake port 15a and the exhaust port 15b are provided in the right main housing 12c and the left main housing 12d, respectively, so that cooling air can be supplied to the left and right sides of the stator 11a and the transmission mechanism housing 23, respectively. Further, a plurality of ribs 23c1 are formed on the side wall 23c of the transmission mechanism housing 23. These ribs function as radiating fins, and air flows outside the ribs 23c1, so that the transmission mechanism housing 23 can be cooled appropriately. can be done.
本発明は上記実施の形態に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。例えば、上記実施の形態においては、伝達機構ハウジング23の下方にステータ支持部23bが位置する場合を説明したが、伝達機構ハウジング23の後方にステータ支持部23b(ステータ11a)が位置するように構成しても良い。また、作業機としてセーバソーの形態を説明したが、グラインダやジグソーなど、金属製の伝達機構ハウジングを用いる作業機には本願発明を適用可能である。また、電池パック(電池)の代わりに交流電源を用いる方式、つまり電源コードを有する方式にも本発明は適用可能である。また、延在部23b1は4つとしたが、それより多くても少なくてもよい。また、メインハウジング12は、硬質樹脂部12aと軟質樹脂部12bとにより構成したが、硬質樹脂部のみによって構成することも可能である。
The present invention is not limited to the above embodiments, and can be modified in various ways without departing from the scope of the invention. For example, in the above embodiment, the stator support portion 23b is positioned below the transmission mechanism housing 23. However, the stator support portion 23b (stator 11a) is positioned behind the transmission mechanism housing 23. You can Also, although the form of the saber saw has been described as the work machine, the present invention can be applied to work machines such as grinders and jigsaws that use a metal transmission mechanism housing. The present invention can also be applied to a system that uses an AC power supply instead of a battery pack (battery), that is, a system that has a power cord. Also, although the number of extension portions 23b1 is four, it may be more or less. Further, although the main housing 12 is composed of the hard resin portion 12a and the soft resin portion 12b, it may be composed of only the hard resin portion.
10…作業機、11…モータ、11a…ステータ(通電部)、11b…ステータコア、11c…ステータコイル、11d…ロータ、11e…回転軸、11f…凸部、11g…凹部、12…メインハウジング、12a…硬質樹脂部、12b…軟質樹脂部、12c…右側メインハウジング、12d…左側メインハウジング、12e…支持部、12f…支持部(規制部)、12g…隔壁、12h…本体部、12i…支持部、13…電池パック、13a…電池セル、14…ハンドル、15…モータケース、15a…吸気口、15b…排気口、16…装着部、17…ブレード、18…ベース、19…ブレード取付部、20…トリガ、20a…トリガスイッチ、21…コントローラ(通電部)、21a…センサ基板、22…配線、23…伝達機構ハウジング、23a…伝達機構収容部、23b…ステータ支持部(被嵌合部)、23c…側壁、23d…ねじボス、23e,23f…リブ、23g…モータ軸用開口部、23h…伝達機構軸用開口部、23b7…突起部、23j,23k…軸受部、24…伝達機構ハウジング領域、25…電装部品収容領域、26…ベアリングホルダ(位置決め部材)、26a…支持部、26b…面取り部、27…上側ベアリング、27a…ベアリングロック、28…下側ベアリング、28a…ベアリングロック、29…ギヤ、30…回転軸、31…スチールボール、32…ストラスワッシャ、33…ダンパ、34…クランク、35…プランジャ(出力部)、35a…孔部、35b…ボルト、36…ローラ、37…カウンタウエイト、37a…孔部、37b…溝部、38…ダストガード、39…Oリング、40…伝達機構、41…スリーブ、42…ガイド部材、43…スペーサ、44…メタルプレート、44a…ボルト、45…スチールボール、46…ガイド、47…ダンパ、48…シール材、49…上部カバー、49a…ボルト、50…ファンガイド(位置決め部材)、50a…支持部、50b…切欠部、50c…面取り部、50d…突起部、51…遠心ファン(ファン)、52,53,54…風路、S1,S2,S3…回り止め部
DESCRIPTION OF SYMBOLS 10... Working machine, 11... Motor, 11a... Stator (energization part), 11b... Stator core, 11c... Stator coil, 11d... Rotor, 11e... Rotating shaft, 11f... Convex part, 11g... Concave part, 12... Main housing, 12a Hard resin portion 12b Soft resin portion 12c Right main housing 12d Left main housing 12e Supporting portion 12f Supporting portion (restriction portion) 12g Partition wall 12h Body portion 12i Supporting portion 13 Battery pack 13a Battery cell 14 Handle 15 Motor case 15a Intake port 15b Exhaust port 16 Mounting part 17 Blade 18 Base 19 Blade mounting part 20 Trigger 20a Trigger switch 21 Controller (energizing portion) 21a Sensor substrate 22 Wiring 23 Transmission mechanism housing 23a Transmission mechanism accommodating portion 23b Stator support portion (fitted portion) 23c side wall 23d screw boss 23e, 23f rib 23g motor shaft opening 23h transmission mechanism shaft opening 23b7 protrusion 23j, 23k bearing 24 transmission mechanism housing region , 25... Electric component housing area 26... Bearing holder (positioning member) 26a... Support part 26b... Chamfered part 27... Upper bearing 27a... Bearing lock 28... Lower bearing 28a... Bearing lock 29... Gear 30 Rotating shaft 31 Steel ball 32 Struct washer 33 Damper 34 Crank 35 Plunger (output part) 35a Hole 35b Bolt 36 Roller 37 Counterweight , 37a... hole, 37b... groove, 38... dust guard, 39... O-ring, 40... transmission mechanism, 41... sleeve, 42... guide member, 43... spacer, 44... metal plate, 44a... bolt, 45... steel Ball 46 Guide 47 Damper 48 Sealing material 49 Top cover 49a Bolt 50 Fan guide (positioning member) 50a Supporting part 50b Notch 50c Chamfer 50d Protrusions 51... Centrifugal fan (fan) 52, 53, 54... Air passages S1, S2, S3... Detent parts
Claims (15)
- ステータ及びロータを有するモータと、
前記モータによって駆動される出力部と、
前記出力部に前記モータの動力を伝達する伝達機構と、
前記伝達機構を収容する伝達機構収容部と、前記ステータの外周に位置して前記ステータを支持するステータ支持部と、を備える金属製の伝達機構ハウジングと、
前記ステータ支持部に支持された前記ステータを収容する樹脂製のメインハウジングと、を有する、作業機。 a motor having a stator and a rotor;
an output driven by the motor;
a transmission mechanism that transmits power of the motor to the output unit;
a metal transmission mechanism housing including a transmission mechanism accommodating portion that accommodates the transmission mechanism; and a stator support portion that is positioned on the outer periphery of the stator and supports the stator;
a main housing made of resin that accommodates the stator supported by the stator support portion. - ステータ及びロータを有するモータと、
前記モータを収容するとともに、規制部を備えた樹脂製のメインハウジングと、
前記モータによって駆動される出力部と、
前記出力部に前記モータの動力を伝達する伝達機構と、
前記伝達機構を収容するとともに、被嵌合部を備えた金属製の伝達機構ハウジングと、
を有する作業機であって、
前記ステータは、前記モータの回転軸に沿った方向で前記被嵌合部と嵌合されるとともに、前記規制部によって前記伝達機構ハウジングから離間する方向の移動が規制される、作業機。 a motor having a stator and a rotor;
a resin main housing containing the motor and provided with a restricting portion;
an output driven by the motor;
a transmission mechanism that transmits power of the motor to the output unit;
a metal transmission mechanism housing containing the transmission mechanism and having a fitted portion;
A work machine having
The stator is a work machine that is fitted with the fitted portion in a direction along the rotation shaft of the motor, and is restricted from moving in a direction away from the transmission mechanism housing by the restricting portion. - 前記メインハウジングは、前記ステータが前記伝達機構から離間する方向に移動することを規制する規制部を含む、請求項1に記載の作業機。 The working machine according to claim 1, wherein the main housing includes a restricting portion that restricts movement of the stator in a direction away from the transmission mechanism.
- 前記ステータ支持部は、前記伝達機構収容部からステータ側に向けて延在している、請求項1に記載の作業機。 The working machine according to claim 1, wherein the stator support portion extends from the transmission mechanism housing portion toward the stator side.
- 前記モータの駆動を制御するコントローラを有し、
前記伝達機構ハウジングは、前記ステータまたは前記コントローラのうちの少なくとも一方を含む通電部を覆っている、請求項1または2に記載の作業機。 having a controller for controlling driving of the motor;
The work machine according to claim 1 or 2, wherein the transmission mechanism housing covers a current-carrying section including at least one of the stator and the controller. - 前記ステータの少なくとも一部は、前記伝達機構ハウジングによって覆われ、かつ、前記メインハウジングによって覆われている、請求項1または2に記載の作業機。 The working machine according to claim 1 or 2, wherein at least part of said stator is covered by said transmission mechanism housing and is covered by said main housing.
- 前記伝達機構ハウジングの一部または全部は、前記メインハウジングによって覆われている、請求項6に記載の作業機。 The working machine according to claim 6, wherein part or all of said transmission mechanism housing is covered with said main housing.
- 前記ステータの外周部に前記ステータを位置決めする位置決め部材が設けられ、
前記ステータは、前記位置決め部材を介して前記伝達機構ハウジングによって支持される、請求項1または2に記載の作業機。 A positioning member for positioning the stator is provided on the outer peripheral portion of the stator,
3. The working machine according to claim 1, wherein said stator is supported by said transmission mechanism housing via said positioning member. - 前記モータの回転軸にファンが設けられ、
前記位置決め部材は、前記ファンを支持するファンガイドである、請求項8に記載の作業機。 A fan is provided on the rotating shaft of the motor,
The working machine according to claim 8, wherein the positioning member is a fan guide that supports the fan. - 前記モータの回転軸にベアリングが設けられ、
前記位置決め部材は、前記ベアリングを保持するベアリングホルダである、請求項8に記載の作業機。 A bearing is provided on the rotating shaft of the motor,
The working machine according to claim 8, wherein the positioning member is a bearing holder that holds the bearing. - 前記位置決め部材は、樹脂部材である、請求項8に記載の作業機。 The work machine according to claim 8, wherein the positioning member is a resin member.
- 前記ステータは、絶縁部材を介して前記伝達機構ハウジングに支持される、請求項1または2に記載の作業機。 3. The working machine according to claim 1, wherein said stator is supported by said transmission mechanism housing via an insulating member.
- 前記ステータ支持部には、前記ステータの径方向に貫通する開口部が設けられる、請求項1に記載の作業機。 The working machine according to claim 1, wherein the stator support portion is provided with an opening penetrating through the stator in a radial direction.
- 前記モータによって回転するファンを有し、
前記開口部は、前記ファンが回転した際の空気の通り道となるように構成される、請求項13に記載の作業機。 having a fan rotated by the motor;
14. The working machine according to claim 13, wherein the opening is configured to be an air passage when the fan rotates. - 前記伝達機構ハウジングに支持された状態の前記モータが、前記メインハウジングに収容されるように構成される、請求項1に記載の作業機。 The work machine according to claim 1, wherein the motor supported by the transmission mechanism housing is housed in the main housing.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-197267 | 2021-12-03 | ||
JP2021197267 | 2021-12-03 | ||
JP2022-115659 | 2022-07-20 | ||
JP2022115659 | 2022-07-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023101021A1 true WO2023101021A1 (en) | 2023-06-08 |
Family
ID=86612442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/044624 WO2023101021A1 (en) | 2021-12-03 | 2022-12-02 | Work machine |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2023101021A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017142092A1 (en) * | 2016-02-19 | 2017-08-24 | 株式会社マキタ | Work tool |
JP6440554B2 (en) * | 2015-04-01 | 2018-12-19 | 株式会社マキタ | Rechargeable reciprocating saw |
WO2020137358A1 (en) * | 2018-12-28 | 2020-07-02 | 工機ホールディングス株式会社 | Working machine |
JP2021062579A (en) * | 2019-10-16 | 2021-04-22 | 株式会社マキタ | Reciprocating saw |
-
2022
- 2022-12-02 WO PCT/JP2022/044624 patent/WO2023101021A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6440554B2 (en) * | 2015-04-01 | 2018-12-19 | 株式会社マキタ | Rechargeable reciprocating saw |
WO2017142092A1 (en) * | 2016-02-19 | 2017-08-24 | 株式会社マキタ | Work tool |
WO2020137358A1 (en) * | 2018-12-28 | 2020-07-02 | 工機ホールディングス株式会社 | Working machine |
JP2021062579A (en) * | 2019-10-16 | 2021-04-22 | 株式会社マキタ | Reciprocating saw |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11701722B2 (en) | Reciprocating tool | |
US10814517B2 (en) | Chain saw | |
US11045939B2 (en) | Power tool | |
WO2020218073A1 (en) | Work tool | |
JP2013119129A (en) | Power tool | |
JP7136202B2 (en) | power tools | |
CN113369537A (en) | Electric tool | |
US20230121902A1 (en) | Impact tool | |
US20230173599A1 (en) | Power tool | |
WO2023101021A1 (en) | Work machine | |
US20230302622A1 (en) | Electric work machine | |
JP7159627B2 (en) | power tools | |
WO2021033473A1 (en) | Electric powered working machine | |
JP7458162B2 (en) | grinder | |
WO2021033410A1 (en) | Electric work machine | |
JP7526012B2 (en) | Electric tool | |
JP7382190B2 (en) | rotary tool | |
JP7274857B2 (en) | reciprocating tool | |
US11685036B2 (en) | Motor mounting assembly for a power tool | |
JP7409051B2 (en) | electrical equipment | |
US20230405775A1 (en) | Compact impact tool | |
JP2021142591A (en) | Electric power tool | |
JP2023061297A (en) | impact tool | |
JP2022141450A (en) | Electric tool | |
JP2023179279A (en) | Impact tool |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22901451 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023565116 Country of ref document: JP |