WO2020064005A1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
WO2020064005A1
WO2020064005A1 PCT/CN2019/109429 CN2019109429W WO2020064005A1 WO 2020064005 A1 WO2020064005 A1 WO 2020064005A1 CN 2019109429 W CN2019109429 W CN 2019109429W WO 2020064005 A1 WO2020064005 A1 WO 2020064005A1
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WO
WIPO (PCT)
Prior art keywords
air inlet
air
head
motor
heat dissipation
Prior art date
Application number
PCT/CN2019/109429
Other languages
English (en)
Chinese (zh)
Inventor
张响亮
吉绍山
马建英
Original Assignee
苏州宝时得电动工具有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201811161412.8A external-priority patent/CN110962016B/zh
Priority claimed from CN201811158952.0A external-priority patent/CN110962079A/zh
Application filed by 苏州宝时得电动工具有限公司 filed Critical 苏州宝时得电动工具有限公司
Publication of WO2020064005A1 publication Critical patent/WO2020064005A1/fr

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    • 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

Definitions

  • the invention relates to the technical field of electric tools, in particular to a handheld electric tool.
  • Hand-held electric tools are driven by a motor-driven work head.
  • the user grasps work tools that perform cutting, drilling, and grinding on the workpiece.
  • work tools For example, angle grinders, sanders, electric circular saws, etc. require users to hold the tools for operation.
  • the motor In work, the motor needs to be powered on. Current flows through the winding to generate a magnetic field, which causes the rotor to rotate and output torque. At the same time, the current will also generate a lot of heat in the winding.
  • the angle grinder also known as a grinder or disc grinder, is a hand-held power tool that uses a wheel to cut or grind. It is mainly used to cut, grind, and brush metal and stone. Wait.
  • the traditional angle grinder enters the wind from one end of the handle, first cools the handle, then guides the wind to the end of the motor, passes through the motor, and finally winds out from the front of the motor to cool the handle and the motor.
  • the fan is installed at one end of the motor.
  • the cooling air is driven by the fan from one end of the motor to the other end, which makes the cooling air path longer.
  • the temperature of the cooling air is low, and the part of the motor at this stage has a good cooling effect; at the end of the air path, the temperature of the cooling air is high, and the part of the motor in this stage has a poor cooling effect.
  • the traditional hand-held power tool has a long air path, a single air path, and a small air volume, and the cooling effect of the motor and the whole machine is not good.
  • a hand-held power tool includes a motor, which has a motor casing and an output shaft, and the motor casing is provided with air inlet holes and air outlet holes.
  • the casing includes a head housing that houses the motor, and The holding portion is arranged at an angle, and the casing is provided with an air inlet and an air outlet; a fan is connected to the output shaft; wherein, the motor housing has oppositely arranged head ends and tail ends, and the air inlet hole includes a first An air inlet hole and a second air inlet hole provided at the tail end.
  • the air outlet hole is provided between the head end and the tail end, and the output shaft protrudes from the head end.
  • the above technical solution has at least the following technical effects: a first heat dissipation air path entering the motor housing from the first air inlet hole, a first heat dissipation airflow from the air outlet hole, and electric power entering from the second air inlet hole are formed in the angle grinder housing.
  • the above two cooling air passages increase the amount of air entering the motor casing, and the lengths of the two cooling air passages are relatively short, which prevents the higher temperature cooling air from flowing in the motor, which can not only reduce the inside of the head case.
  • the temperature can also enhance the cooling effect on the motor, reduce the temperature rise of the motor, and improve the overall cooling and cooling effect.
  • the air outlet is disposed on the head case near the air outlet.
  • the air inlet includes a tail air inlet, and the tail air inlet is located near the tail end of the head shell; a first heat dissipation air duct is formed in the head shell, and the first heat dissipation air duct is inside the motor casing.
  • the first cooling air duct enters the air from the tail air inlet, flows through the second cooling air path, and exhausts the air from the air outlet.
  • the air inlet includes a head-end air inlet, and the head-end air inlet is provided near the head end of the head shell; a second heat dissipation air duct is formed in the head shell, and the second heat dissipation air duct and the motor casing When the fan is driven to rotate by the output shaft, the second cooling air duct enters air from the air inlet at the head end, flows through the second cooling air path, and exhausts air from the air outlet.
  • the air inlet includes a handle air inlet provided on the holding portion, a third heat dissipation air duct is formed in the casing, the third heat dissipation air duct is in communication with the first heat dissipation air path, and the fan is driven to rotate by the output shaft At this time, the wind entering from the air inlet of the handle flows through the third heat dissipation air duct and enters the motor casing through the first air inlet.
  • the air inlet includes a handle air inlet provided on the holding portion, a third heat dissipation air duct is formed in the casing, the third heat dissipation air duct is in communication with the first heat dissipation air path, and the fan is driven to rotate by the output shaft At this time, the wind entering from the air inlet of the handle flows through the third heat dissipation air duct and enters the motor casing through the first air inlet.
  • the air inlet includes a handle air inlet provided on the holding part, a third heat dissipation air duct is formed in the casing, the third heat dissipation air duct is in communication with the second heat dissipation air path, and the fan is driven to rotate by the output shaft At this time, the wind entering from the air inlet of the handle flows into the motor casing through the second air inlet after flowing through the third heat dissipation air duct.
  • an electronic component is included in the holding part, including at least a circuit board and a switch assembly; wherein a heat sink is provided on the circuit board, the switch assembly is electrically connected to the circuit board, and the wind entering from the handle air inlet passes through Electronic component.
  • the holding portion includes two Huff-type shells, and the handle air inlet is symmetrically disposed on the two Huff-type shells.
  • an isolation rib is provided between the inner wall of the holding portion, the outer wall of the motor housing, and the inner wall of the casing.
  • the isolation rib separates the air outlet hole from the first air inlet hole, so that The wind entering the handle air inlet enters the inside of the motor casing through the first air inlet.
  • an isolation rib is provided between the inner wall of the holding portion, the outer wall of the motor casing and the inner wall of the casing, and the isolation rib separates the air outlet hole from the second air inlet hole, so that The wind entering the handle air inlet enters the inside of the motor casing through the second air inlet.
  • the tail air inlet is disposed on a side wall and / or an end wall of the head shell.
  • the first air inlet and / or the head air inlet is provided with a protective net.
  • the fan is disposed near the air outlet.
  • a working head and a transmission shaft sleeved on the output shaft are further included, and the working head is connected to the transmission shaft.
  • two bearings are provided on the transmission shaft at intervals along the axial direction of the transmission shaft to support the transmission shaft.
  • the transmission shaft is further provided with a locking ring, the locking ring is provided with a locking groove, and a locking component that can be matched with the locking groove is also provided in the radial direction of the transmission shaft to lock the rotation of the transmission shaft. motion.
  • the locking assembly includes a lock button, a latch connected to the lock button, and an elastic member sleeved on the latch; the latch can overcome the resistance of the elastic member and cooperate with the slot to lock the transmission. With the rotational movement of the shaft, the elastic member is configured to provide an elastic force to reset the bayonet.
  • a battery pack mounting portion is provided at an end of the holding portion remote from the head shell; the handheld power tool includes a battery pack removably connected to the battery pack mounting portion, and the battery pack is disposed to extend along the longitudinal axis.
  • the shape is long, and the holding part has a longitudinally extending axis of the holding part.
  • the battery pack has a mounting end mated with the battery pack mounting part and a bottom plane of the battery pack opposite to the mounting end. The angle is set, and the longitudinal axis is perpendicular to the output shaft axis.
  • the central axis of the grip is perpendicular to the axis of the output shaft.
  • a hand-held power tool includes: a casing, including a head casing, and a holding portion disposed at an angle of the head casing; a motor, disposed in the head casing, having a motor casing, an output shaft, and a fan; and the motor casing
  • An air inlet is provided on the body; the motor housing has oppositely arranged head ends and tail ends, and the output shaft extends from the head end.
  • the air inlet holes include a first air inlet hole provided at the head end and a second air inlet hole provided at the tail end.
  • the air hole and the fan are arranged between the first air inlet hole and the second air inlet hole, and an air outlet hole is also provided on the motor casing near the fan.
  • FIG. 1 is a schematic structural diagram of a handheld power tool head shell according to a first embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a handheld power tool head shell according to a second embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a handheld power tool head shell according to a third embodiment of the present invention.
  • FIG. 4 is a cross-sectional view taken along A-A shown in FIG. 1;
  • FIG. 5 is a schematic structural diagram of a handheld power tool according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a holding portion of a handheld power tool according to an embodiment of the present invention.
  • Fig. 7 is a sectional view taken along C-C shown in Fig. 6;
  • FIG. 8 is a schematic diagram of another angle structure of a hand-held power tool according to an embodiment of the present invention.
  • FIG. 9 is a schematic perspective view of a state where a casing of a hand-held power tool according to the present invention is separated from a battery pack.
  • FIG. 10 is a schematic diagram of a motor of a handheld power tool according to the present invention.
  • FIG. 11 is another schematic perspective view of the motor of the handheld power tool according to the present invention.
  • FIG. 12 is a cross-sectional view of a motor of a handheld power tool according to the present invention.
  • the first embodiment of the present invention provides a hand-held power tool 100, which can improve the overall heat dissipation and cooling effect.
  • the handheld power tool 100 includes a casing, which includes a head casing 110 and a holding portion 130 disposed at an angle to the head casing 110.
  • the casing is provided with an air inlet and an air outlet.
  • the motor 120 is disposed in the head case 110 and has an output shaft 126, a motor case, and a fan.
  • the motor case is provided with air inlet holes and air outlet holes 176.
  • the output shaft 126 of the motor 120 is connected to a transmission mechanism, and the transmission mechanism is connected to the work head 150 to drive the work of the work head 150.
  • the output shaft can also be connected directly to the work head.
  • the working head 150 may be a cutting sheet for cutting, a grinding sheet for grinding, a polishing sheet for polishing, or the like.
  • a safety shield 114 is fixedly connected to the outer side of the working head 150, and has a posture of semi-enveloping the working head 150. Other shields can be added according to the working mode to prevent sputtering of grinding particles and the like, thereby further improving safety.
  • a safety shield 114 is provided on the outside of the working head 150 for use as a matte shield, and a cutting shield may also be provided to improve safety.
  • the electric machine 120 includes a stator provided in a housing of the electric machine 120, wherein the stator is in interference fit with the housing of the electric machine 120.
  • the stator belongs to the stationary part of the motor 120, and its main function is to generate a rotating magnetic field.
  • an interference fit is set between the stator and the housing of the motor 120 to ensure that the stator is in a relatively stationary state.
  • the motor casing has opposite head ends 122 and tail ends 124, and the output shaft protrudes from the head ends.
  • the air inlet hole includes a first air inlet hole 123 provided at the head end and a second air inlet hole 125 provided at the tail end.
  • the output shaft protrudes from the head end, which is convenient for assembling the working head or other transmission mechanism.
  • the working head 150 is driven and rotated by the output shaft, and may be directly driven or rotated by the output shaft 126 through the transmission mechanism.
  • the transmission mechanism can be connected to and driven by the output shaft 126.
  • the holding portion 130 is connected to the head case 110, and the holding portion 130 is disposed at an angle to the head case 110.
  • the central axis of the holding portion and the axis of the output shaft may be perpendicular or may be disposed at other angles.
  • the air outlet 177 is disposed on the head case 110 near the air outlet 176, so that the wind flowing out from the air outlet can be directly and quickly discharged from the air outlet to the outside of the cabinet.
  • the air inlet includes a tail air inlet 173, and the tail air inlet 173 is provided near the tail end of the head shell; a first heat dissipation air duct is formed in the head shell, and the first heat dissipation duct and the second heat dissipation in the motor casing are formed.
  • the first cooling air duct enters air from the tail air inlet, flows through the second cooling air path, and exhausts air from the air outlet.
  • the air flowing from the tail end air inlet into the casing enters the motor casing, which can cool the motor, and the tail air inlet is far away from the output shaft and far from the work area, so there is less dust and iron debris in the incoming wind.
  • the tail air inlet may be disposed on a side wall and / or an end wall of the head shell.
  • the air inlet also includes a head-end air inlet 172, which is located in the head case near the head end 122; a second heat-radiating air duct is formed in the head case 110, and the The first heat dissipation air path communicates.
  • the second heat dissipation air duct enters the air from the air inlet at the head end, flows through the second heat dissipation air path, and exhausts the air from the air outlet.
  • the air flowing from the tail air inlet into the casing enters the motor casing, which can effectively cool the motor.
  • a protective net is provided at the first air inlet and / or the air inlet at the first end. Since the first air inlet and the head-end air inlet 172 are relatively close to the working head 150, when the work head 150 is in a working state, especially in a sanding condition, a large amount of workpiece debris is easily removed from the head-end air inlet 172. Inhalation enters the inside of the housing of the motor 120 through the first air inlet, which affects the operation of the motor 120.
  • the first air inlet and / or the head air inlet 172 is provided with a protective net, which can largely prevent workpiece debris from entering the interior of the housing of the motor 120.
  • the mesh number of the protective net (the larger the mesh number, the smaller the mesh hole diameter) is generally 60 to 140. If the mesh number is too small, the mesh size is too large, and the workpiece debris easily passes through the mesh and cannot prevent it. If the mesh size is too large, the mesh size is too small, which affects the air intake effect.
  • the number and shape of the air inlets are not limited. On the premise of ensuring the strength of the housing of the motor 120, multiple air inlets may be provided, and the shape may be circular, oval, rectangular, or the like.
  • the heat source of the motor 120 is the motor core.
  • the casing of the motor 120 is provided with a plurality of air inlet holes, so that the wind entering from the air inlet at the head end or the air inlet at the tail end can flow more through the inside of the housing of the motor 120 , For the motor 120 core cooling and cooling.
  • the wind entering from the air inlet at the head end or the air inlet at the tail end will also flow through the exterior of the housing of the motor 120 to improve the heat dissipation effect.
  • Wind holes 176 may be provided at intervals around the circumferential contour of the casing of the motor 120, or a cylindrical opening may be opened along the circumferential contour of the casing of the motor 120 to form the ventilation holes 176.
  • the wind flowing through the inside of the housing of the motor 120 is discharged from the air outlet 176 and directly flows to the air outlet 177.
  • the air inlet also includes a handle air inlet 171 provided at the holding portion 130.
  • a third heat dissipation air duct is formed in the grip portion 130, and the third heat dissipation air duct is in communication with the first heat dissipation air path.
  • the third cooling air duct is connected with the first cooling air path. After entering the air from the first air inlet, first cool the holding part, then enter the head shell, cool the motor, and then discharge it from the air outlet. Lowering the temperature of the holding part makes the holding operation more comfortable, and also reduces the temperature of the head shell and the motor, ensuring the working efficiency and the life of the motor.
  • an electronic component is disposed in the holding portion 130 and includes at least a circuit board 132 and a switch assembly 190.
  • a circuit board 132 is disposed in the holding portion 130, and a heat sink 134 is disposed on the circuit board 132.
  • the circuit board 132 is electrically connected to the battery pack 160.
  • the circuit board 132 constitutes a part of the working circuit.
  • the circuit board 132 is an electronic component and is easy to generate heat and heat during work. Therefore, a heat sink 134 is provided on the circuit board 132. In order to reduce the temperature rise of the circuit board 132.
  • the heat sink 134 can be made of aluminum alloy, has good thermal conductivity, and can dissipate heat to the circuit board 132.
  • the grip portion 130 is provided with a handle air inlet 171, and the wind entering from the handle air inlet 171 can take away the grip 130
  • the heat generated inside enters the inside of the housing of the motor 120 through the air inlet, takes away the heat generated by the motor 120, flows out from the air outlet 176, and exhausts the air from the air outlet 177 to form a third heat dissipation air duct.
  • the motor 120 is further connected with a magnetic ring 129 to suppress high-frequency noise.
  • a magnetic ring 129 is provided between the switching element 198 and the motor 120.
  • the magnetic ring 129 can be used to reduce noise and improve the performance of the handheld power tool 100. Improve operator comfort.
  • an isolation rib 112 is provided between the inner wall of the holding portion 130, the outer wall of the housing of the motor 120 and the inner wall of the head case 110. It is isolated from the first air inlet so that the wind entering from the handle air inlet 171 can enter the motor 120 through the first air inlet.
  • the function of the isolation rib 112 is to guide the wind from the holding portion 130, and to block the wind from the holding portion 130 from being directly discharged through the air outlet 176 and the air outlet 177, so that the wind from the holding portion 130 can be blocked.
  • first end 122 of the motor 120 More through the first end 122 of the motor 120, enter the inside of the housing of the motor 120 through the first air inlet, and then discharge the head shell 110 to increase the heat radiation path of the wind from the holding portion 130, and play the role of the heat from the holding portion 130. Greater cooling effect of wind.
  • the holding portion 130 is further provided with a switch assembly 190.
  • the switch component 190 is electrically connected to the circuit board 132.
  • the switch component 190 is used to control the on-off of the working circuit, and then control the working state of the handheld power tool 100.
  • the switch assembly 190 includes a switch button 192 provided outside the grip portion 130, a switch lever 194 provided in the grip portion 130 connected to the switch button 192, a return spring 196 connected to the switch lever 194, and a switch lever 194,
  • the switching element 198 is connected to the return spring 196.
  • the switch assembly 190 is also electrically connected to the motor 120, specifically, the switch element 198 is electrically connected to the motor 120 to control the working state of the motor 120.
  • the circumferential contour size of the holding portion 130 matches the holding range of the hand, which is convenient for the operator to hold the operation for a long time.
  • Electronic components and the like are also provided in the holding portion 130 to constitute a working circuit to control the operation of the motor 120.
  • the traditional motor is set in the grip, and the motor generates a certain amount of heat during work, and this heat is transferred to the grip, so that when the operator uses the handheld power tool in the grip, the heat is transferred to the operator's On the hand, it affects the comfort of the operator.
  • the motor 120 is disposed in the head case 110, the holding portion 130 is connected to the head case 110, and the holding portion 130 and the head case 110 are disposed at an angle.
  • the motor 120 is disposed in the head housing 110 and is close to the working head 150, which can also reduce the torque output path of the motor 120 and reduce the loss of torque in the transmission process.
  • the holding portion 130 and the head case 110 are disposed at an angle. It can be understood that the holding portion 130 and the head case 110 are neither parallel nor collinear. The specific angle is determined according to the actual production to facilitate the operation of the operator. .
  • the holding portion 130 is disposed at an angle to the head shell 110, which can also be understood as the central axis X of the holding portion 130 and the axis Y of the output shaft 126 are not parallel, that is, the central axis X of the holding portion 130 and the output shaft 126
  • the axis Y is neither coincident or side-by-side.
  • the central axis X of the holding portion 130 is perpendicular to the axis Y of the output shaft 126.
  • the head shell 110 and the holding portion 130 From the external shape, the head shell 110 and the holding portion 130 have an approximately vertical relationship.
  • the hand-held power tool 100 is in the shape of a gun as a whole, and has a more compact structure in the axial direction of the output shaft 126.
  • the connection between the holding portion 130 and the head shell 110 is basically located in the middle of the head shell 110, which is convenient for operators to hold and operate.
  • the holding portion 130 includes two Huff-type housings symmetrically.
  • the handle air inlets 171 are symmetrically disposed on the two Huff-type housings, and the wind entering from the handle air inlets 171 passes through the circuit board 132.
  • Huff-type housing is also called half-type housing, which is a common way of forming the housing in power tools. Most of the housing is divided into two parts along the axis of the housing, which facilitates the assembly of components in the housing. internal.
  • the gripping portion 130 is usually formed by joining two symmetrical parts to facilitate disassembly and maintenance of the components in the gripping portion 130.
  • the handle air inlet 171 is located at the position of the holding portion 130 and is close to the circuit board 132 to ensure entry from the handle air inlet 171.
  • the wind can pass through the circuit board 132 to cool and cool the circuit board 132.
  • the hand-held power tool 100 further includes a battery pack 160.
  • a battery pack mounting portion 1628 is provided at an end of the grip portion away from the head case.
  • the battery pack 160 can be mated with the battery pack mounting portion 1628 in an insertion manner in a direction indicated by an arrow R.
  • the battery pack 160 is fixedly connected or detachably connected to the holding portion 130, and provides a power source for the work of the handheld power tool 100.
  • a battery pack or a battery pack composed of a plurality of batteries is installed in the battery pack 160.
  • the battery may be a rechargeable battery or a non-rechargeable battery.
  • the battery pack 160 has a mounting end 1632 matching the battery pack mounting portion 1628 and a bottom plane 1636 of the battery pack opposite the mounting end 1632.
  • the battery pack 160 is provided with a plurality of batteries (not shown in the figure) arranged in parallel.
  • the battery pack 160 is arranged in an elongated shape extending along the longitudinal axis Z, and the longitudinal axis Z is perpendicular to the output shaft axis Y in different planes.
  • the angle of inclination of the axis of the holding portion and the bottom plane of the battery pack is between 100 and 120 degrees.
  • the holding part is connected to the middle part of the head shell, and the holding part and the head shell are T-shaped.
  • the axis of the grip portion passes through the head case and the battery pack.
  • the length of the grip is set between 85mm and 115mm.
  • the projection of the center of gravity of the handheld power tool to the plane of the bottom surface of the battery pack falls within the outline of the bottom surface of the battery pack, so that the bottom surface of the battery pack can support the handheld power tool upright on the horizontal plane.
  • the transmission mechanism includes a hollow transmission shaft 142 sleeved on the output shaft 126.
  • the portion of the output shaft 126 protruding from the head end 122 has a certain length, but is not directly connected to the working head 150. Instead, a hollow transmission shaft 142 is provided around the output shaft 126, and the transmission shaft 142 and the output shaft 126 are in interference. In cooperation, the output shaft 126 can drive the transmission shaft 142 to rotate. In this way, the entire motor 120 can be prevented from being replaced after the output shaft 126 is damaged, and only the transmission shaft 142 needs to be replaced, which reduces the maintenance cost.
  • the double bearings can further ensure the rotation stability of the transmission shaft 142 and reduce the chattering phenomenon of the transmission shaft 142.
  • the rotation stability of the working head 150 is also improved, and the working head is improved. 150 working accuracy.
  • the transmission shaft 142 is also sleeved with a locking ring 144, the locking ring 144 is provided with a locking groove 146, and a locking component 180 that can cooperate with the locking groove 146 is also provided in the radial direction of the transmission shaft 142 to lock the transmission Rotating motion of the shaft 142.
  • a locking ring 144 with a slot 146 is also sleeved around the transmission shaft 142.
  • the lock ring 144 is located between two bearings.
  • the lock ring 144 and the transmission shaft 142 are also arranged in an interference fit.
  • the locking assembly 180 is first mated with the slot 146 to prevent the rotation of the locking ring 144, thereby preventing the rotation of the transmission shaft 142, and then the work is replaced. Head 150.
  • the locking assembly 180 can prevent the transmission shaft 142 from rotating when the working head 150 is replaced, which facilitates the replacement of the working head 150 and improves work efficiency.
  • the locking assembly 180 includes a lock shaft button 182, a latch 186 connected to the lock shaft button 182, and an elastic member 184 sleeved on the latch 186.
  • the latch 186 can overcome the resistance of the elastic member 184 to move and Cooperating with the slot 146 to lock the rotational movement of the transmission shaft 142, the elastic member 184 is configured to provide an elastic force to reset the latch pin 186.
  • the drive bayonet 186 moves against the resistance of the elastic member 184 toward the transmission shaft 142 until the bayonet 186 and the groove 146 cooperate to lock the transmission shaft 142.
  • the elastic member 184 Compressed. Because an elastic member 184, such as a spring, is provided between the latch 186 and the lock shaft button 182, when the lock shaft button 182 is no longer pressed, the elastic force when the spring recovers pushes the lock pin 186 to reset.
  • the hand-held power tool 100 includes a casing, which includes a head casing 110 and a holding portion 130 disposed at an angle to the head casing 110.
  • the casing is provided with an air inlet and an air outlet.
  • the motor 120 is disposed in the head case 110 and has an output shaft 126, a motor case, and a fan.
  • the motor case is provided with air inlet holes and air outlet holes 176.
  • the motor casing has opposite head ends 122 and tail ends 124, and the output shaft protrudes from the head ends.
  • the air inlet hole includes a first air inlet hole 123 provided at the head end and a second air inlet hole 125 provided at the tail end.
  • the air outlet 177 is disposed on the head case 110 near the air outlet 176, so that the wind flowing out from the air outlet can be directly and quickly discharged from the air outlet to the outside of the cabinet.
  • the air inlet includes a tail air inlet 173, and the tail air inlet 173 is provided near the tail end of the head shell; a first heat dissipation air duct is formed in the head shell, and the first heat dissipation duct and the second heat dissipation in the motor casing are formed.
  • the wind is connected.
  • the first cooling air duct enters air from the tail air inlet, flows through the second cooling air path, and exhausts air from the air outlet.
  • the tail air inlet may be disposed on a side wall and / or an end wall of the head shell.
  • the holding portion 130 is connected to the head case 110, and the holding portion 130 is disposed at an angle to the head case 110.
  • the central axis of the holding portion and the axis of the output shaft may be perpendicular or may be disposed at other angles.
  • An electronic component is disposed in the holding portion 130 and includes at least a circuit board 132 and a switch assembly 190.
  • a circuit board 132 is disposed in the holding portion 130, and a heat sink 134 is disposed on the circuit board 132.
  • the circuit board 132 is electrically connected to the battery pack 160.
  • the circuit board 132 constitutes a part of the working circuit.
  • the circuit board 132 is an electronic component and is easy to generate heat and heat during work. Therefore, a heat sink 134 is provided on the circuit board 132. In order to reduce the temperature rise of the circuit board 132.
  • the heat sink 134 can be made of aluminum alloy, has good thermal conductivity, and can dissipate heat to the circuit board 132.
  • the air inlet also includes a handle air inlet 171 provided on the holding portion 130, and a third heat radiating duct is formed in the holding portion 130.
  • the heat dissipation air duct is in communication with the first heat dissipation air path.
  • an isolation rib 112 is provided between the inner wall of the holding portion 130, the outer wall of the housing of the motor 120, and the inner wall of the head case 110. It is isolated from the first air inlet so that the wind entering from the handle air inlet 171 can enter the motor 120 through the first air inlet.
  • the function of the isolation rib 112 is to guide the wind from the holding portion 130, and to block the wind from the holding portion 130 from being directly discharged through the air outlet 176 and the air outlet 177, so that the wind from the holding portion 130 can be blocked.
  • first end 122 of the motor 120 More through the first end 122 of the motor 120, enter the inside of the housing of the motor 120 through the first air inlet, and then discharge the head shell 110 to increase the heat radiation path of the wind from the holding portion 130, and play the role of the heat from the holding portion 130. Greater cooling effect of wind.
  • the third embodiment of the present invention provides another hand-held power tool with the same or similar structure as the first embodiment, and details are not described herein again.
  • the hand-held power tool 100 includes a casing, which includes a head casing 110 and a holding portion 130 disposed at an angle to the head casing 110.
  • the casing is provided with an air inlet and an air outlet.
  • the motor 120 is disposed in the head case 110 and has an output shaft 126, a motor case, and a fan.
  • the motor case is provided with air inlet holes and air outlet holes 176.
  • the motor casing has opposite head ends 122 and tail ends 124, and the output shaft protrudes from the head ends.
  • the air inlet hole includes a first air inlet hole 123 provided at the head end and a second air inlet hole 125 provided at the tail end.
  • the air outlet 177 is disposed on the head case 110 near the air outlet 176, so that the wind flowing out from the air outlet can be directly and quickly discharged from the air outlet to the outside of the cabinet.
  • the air inlet includes a tail air inlet 173, and the tail air inlet 173 is provided near the tail end of the head shell; a first heat dissipation air duct is formed in the head shell, and the first heat dissipation duct and the second heat dissipation in the motor casing are formed.
  • the wind is connected.
  • the first cooling air duct enters air from the tail air inlet, flows through the second cooling air path, and exhausts air from the air outlet.
  • the tail air inlet may be disposed on a side wall and / or an end wall of the head shell.
  • the air inlet also includes a head-end air inlet 172, which is located in the head case near the head end 122; a second heat-radiating air duct is formed in the head case 110, and the The first heat dissipation air path communicates.
  • the second heat dissipation air duct enters the air from the air inlet at the head end, flows through the second heat dissipation air path, and exhausts the air from the air outlet.
  • the air flowing from the tail air inlet into the casing enters the motor casing, which can effectively cool the motor.
  • a protective net is provided at the first air inlet and / or the air inlet at the first end. Since the first air inlet and the head-end air inlet 172 are relatively close to the working head 150, when the work head 150 is in a working state, especially in a sanding condition, a large amount of workpiece debris is easily removed from the head-end air inlet 172. Inhalation enters the inside of the housing of the motor 120 through the first air inlet, which affects the operation of the motor 120.
  • the first air inlet and / or the head air inlet 172 is provided with a protective net, which can largely prevent workpiece debris from entering the interior of the housing of the motor 120.
  • the mesh number of the protective net (the larger the mesh number, the smaller the mesh hole diameter) is generally 60 to 140. If the mesh number is too small, the mesh size is too large, and the workpiece debris easily passes through the mesh and cannot prevent it. If the mesh size is too large, the mesh size is too small, which affects the air intake effect.
  • the holding portion 130 is connected to the head case 110, and the holding portion 130 is disposed at an angle to the head case 110.
  • the central axis of the holding portion and the axis of the output shaft may be perpendicular or may be disposed at other angles.
  • An electronic component is disposed in the holding portion 130 and includes at least a circuit board 132 and a switch assembly 190.
  • a circuit board 132 is disposed in the holding portion 130, and a heat sink 134 is disposed on the circuit board 132.
  • the circuit board 132 is electrically connected to the battery pack 160.
  • the circuit board 132 constitutes a part of the working circuit.
  • the circuit board 132 is an electronic component and is easy to generate heat and heat during work. Therefore, a heat sink 134 is provided on the circuit board 132. In order to reduce the temperature rise of the circuit board 132.
  • the heat sink 134 can be made of aluminum alloy, has good thermal conductivity, and can dissipate heat to the circuit board 132.
  • the air inlet also includes a handle air inlet 171 provided on the holding portion 130, and a third heat radiating duct is formed in the holding portion 130.
  • the heat dissipation air duct is in communication with the second heat dissipation air path.
  • an isolation rib 112 is provided between the inner wall of the holding portion 130, the outer wall of the housing of the motor 120, and the inner wall of the head case 110, and the isolation rib 112 will open the air outlet 176. It is isolated from the first air inlet so that the wind entering from the handle air inlet 171 can enter the motor 120 through the first air inlet.
  • the function of the isolation rib 112 is to guide the wind from the holding portion 130, and to block the wind from the holding portion 130 from being directly discharged through the air outlet 176 and the air outlet 177, so that the wind from the holding portion 130 can be blocked. More through the first end 122 of the motor 120, enter the inside of the housing of the motor 120 through the first air inlet, and then discharge the head shell 110 to increase the heat radiation path of the wind from the holding portion 130 and exert the Greater cooling effect of wind.

Abstract

La présente invention concerne une machine-outil portative (100), comprenant un moteur (120) ayant un carter de moteur et un arbre de sortie (126), et le carter de moteur étant pourvu d'un trou d'entrée d'air et d'un trou de sortie d'air (176) ; un boîtier, comprenant un boîtier de tête (110) qui accueille le moteur et une portion de préhension (130) disposée selon un angle donné par rapport au boîtier de tête (110), le boîtier étant pourvu d'une entrée d'air et d'une sortie d'air (177) ; et un ventilateur (128), relié à l'arbre de sortie (126). Le carter de moteur comporte une extrémité de tête (122) et une extrémité de queue (124) disposées en regard l'une de l'autre, le trou d'entrée d'air comprend un premier trou d'entrée d'air (123) situé au niveau de l'extrémité de tête (122) et un deuxième trou d'entrée d'air (125) situé au niveau de l'extrémité de queue (124), le trou de sortie d'air (176) est situé entre l'extrémité de tête (122) et l'extrémité de queue (124), et l'arbre de sortie (126) fait saillie à partir de l'extrémité de tête (122). Lorsque le ventilateur (128) est entraîné en rotation au moyen de l'arbre de sortie (126), un premier passage d'air de dissipation de chaleur, dans lequel de l'air pénètre à l'intérieur du carter de moteur par le premier trou d'entrée d'air (123) et sort par le trou de sortie d'air (176), et un deuxième passage d'air de dissipation de chaleur, dans lequel de l'air pénètre dans le carter de moteur par le deuxième trou d'entrée d'air (125) et sort par le trou de sortie d'air (176), sont formés dans le carter de moteur, de sorte que de l'air peut s'écouler dans le carter de moteur à travers au moins deux passages d'air de dissipation de chaleur dans la machine-outil portative (100), ce qui augmente la quantité d'entrée d'air du carter de moteur et améliore l'effet de dissipation de chaleur du boîtier de tête (110) et du moteur (120).
PCT/CN2019/109429 2018-09-30 2019-09-30 Machine-outil portative WO2020064005A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201811161412.8A CN110962016B (zh) 2018-09-30 2018-09-30 角磨机
CN201811161412.8 2018-09-30
CN201811158952.0A CN110962079A (zh) 2018-09-30 2018-09-30 手持式工具
CN201811158952.0 2018-09-30

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WO2020064005A1 true WO2020064005A1 (fr) 2020-04-02

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DE102020210635A1 (de) 2020-08-20 2022-02-24 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine

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TWI750884B (zh) * 2020-11-04 2021-12-21 朝程工業股份有限公司 電動工具

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