WO2021109603A1 - 切割工具 - Google Patents
切割工具 Download PDFInfo
- Publication number
- WO2021109603A1 WO2021109603A1 PCT/CN2020/106748 CN2020106748W WO2021109603A1 WO 2021109603 A1 WO2021109603 A1 WO 2021109603A1 CN 2020106748 W CN2020106748 W CN 2020106748W WO 2021109603 A1 WO2021109603 A1 WO 2021109603A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- motor
- cutting tool
- saw blade
- circuit board
- Prior art date
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Classifications
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- 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
- B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
- B23D45/16—Hand-held sawing devices with circular saw blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B9/00—Portable power-driven circular saws for manual operation
- B27B9/02—Arrangements for adjusting the cutting depth or the amount of tilting
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- 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
- B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
- B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
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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
-
- 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
- B25F5/008—Cooling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
- B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
Definitions
- the invention relates to a cutting tool, in particular to an electric circular saw.
- the layout includes the following structure: the mainframe housing includes a first housing and a second housing; the first housing extends longitudinally and includes a first end for connecting the second housing and a first end for connecting to the power supply device. Two ends, and the middle position of the first housing is configured as a handle for the user to grasp; the second housing contains the motor and the transmission mechanism.
- this layout is not limited by the size of the motor, and the radial size of the handle is designed within a reasonable range, which is convenient to hold; but this type of electric circular saw still uses the traditional
- the brushless motor has a large motor size and low cutting efficiency; while the electric circular saw using a brushless motor generally adopts a D-shaped handle layout, the whole machine has a large structural size, poor portability, and the brushless motor itself will also have a significant increase in heat output. Case.
- the technical problem to be solved by the present invention is to provide an electric circular saw, which solves the technical problems of low cutting efficiency and poor heat dissipation through a reasonable structure design and the adoption of a brushless motor.
- a cutting tool including: an output shaft for installing a saw blade; a motor for driving the output shaft to rotate; the motor is a brushless motor and has A motor shaft; a fan, driven by the motor shaft, for generating a cooling air flow; a transmission device, arranged between the output shaft and the motor shaft, for transmitting the power of the motor to the output shaft, And the motor shaft is parallel to the output shaft; the bottom plate is provided with a saw blade through hole for the saw blade to pass through; the housing includes a first housing and a second housing; the first housing has A first end and a second end, the first end is used to connect to a second housing, the second end is used to connect to a power supply device; the second housing accommodates the motor and the transmission device; the The housing is rotatably connected with the bottom plate through a pivot axis parallel to the output shaft for adjusting the cutting depth; the circuit board is housed in the housing; wherein, the first housing is also provided
- the circuit board is arranged in the first end of the first housing.
- the fan is arranged at one end of the motor shaft close to the saw blade; a cooling air hole is opened on the housing, and the cooling air hole includes a first air inlet and a first outlet.
- the casing is located on the radially outer side of the fan; when the fan rotates, the cooling airflow includes entering the casing from the first air inlet hole, and then exiting the casing from the first air outlet hole
- the first cooling airflow of the body the first cooling airflow dissipates heat for the motor.
- the cooling air hole further includes a second air inlet hole, and the second air inlet hole is opened in the first housing and located between the circuit board and the plane of the saw blade;
- the housing is provided with a first rib assembly; guided by the first rib assembly, when the fan rotates, the cooling air flow further includes entering the housing from the second air inlet , And then a second cooling airflow flowing out of the housing from the first air outlet; the second cooling airflow dissipates heat from the circuit board.
- the cooling air hole further includes a second air outlet, and the second air outlet is opened in the first housing and located between the circuit board and the plane of the saw blade;
- a second rib assembly is provided inside the casing; when the fan rotates, under the guidance of the second rib assembly, the cooling airflow further includes entering the casing from the first air inlet hole, And the second cooling airflow flowing out of the housing from the second air outlet; the second cooling airflow sequentially flows through the motor and the circuit board.
- the fan is arranged at an end of the motor shaft away from the saw blade; a cooling air hole is opened on the housing, and the cooling air hole includes a first air inlet and a first outlet.
- the first air inlet is opened in the first housing, located between the circuit board and the saw blade plane; the first air outlet is opened in the second housing, located A second rib assembly is also provided inside the housing; when the fan rotates, under the guidance of the second rib assembly, the cooling airflow includes the cooling airflow formed in the housing
- the first cooling airflow in the body the first cooling airflow enters the housing from the first air inlet, sequentially flows through the circuit board, the motor, and finally flows out from the first air outlet The housing.
- the cooling air hole further includes a second air inlet hole, which is opened in the second housing and in a direction parallel to the motor shaft, so The second air inlet hole is located between the motor and the transmission device; when the fan rotates, under the guidance of the second rib assembly, the cooling air flow further includes a first airflow formed in the housing Two cooling airflow; the second cooling airflow enters the housing from the second air inlet hole, flows through the motor, and then flows out of the housing from the first air outlet hole.
- the circuit board is arranged at the second end of the first housing, and the fan is arranged at an end of the motor shaft close to the saw blade;
- the cooling air hole includes a An air inlet, a first air outlet, and a second air outlet; the first air inlet is opened on the end of the second housing away from the saw blade; the first air outlet The hole is opened in the second casing and is located on the radially outer side of the fan; the second air outlet is opened in the first casing and is arranged close to the circuit board.
- the circuit board is arranged between the pivot axis and the handle portion.
- the range of the radial circumference of the handle part is between 130 mm and 150 mm.
- the first housing extends along a first axis, and the first axis is perpendicular to the axis of the motor shaft.
- the transmission device adopts a primary transmission, including a driving gear supported on the motor shaft and a driven gear supported on the output shaft; the transmission ratio range of the primary transmission Between 2 and 6.5, the number of teeth of the driven gear is between 12 and 35.
- the cutting depth of the cutting tool is not less than 38 mm.
- a fixed depth slide rail is provided on the bottom plate, the center of the circle corresponding to the fixed depth slide rail is located on the pivot axis, and the fixed depth slide rail and the saw blade are located respectively Both sides of the first housing.
- a cutting tool comprising: an output shaft for installing a saw blade; a motor for driving the output shaft to rotate; the motor is a brushless motor, And has a motor shaft; a transmission device, arranged between the output shaft and the motor shaft, for transmitting the power of the motor to the output shaft, and the motor shaft is parallel to the output shaft; a bottom plate, provided There is a saw blade through hole for the saw blade to pass through; the housing includes a first housing and a second housing; the first housing has a first end and a second end, the first end Used to connect the second housing, the second end is used to connect the power supply device; the second housing contains the motor and the transmission device; wherein, the first housing is also provided for the user to grasp When the user grips the handle portion for cutting operations, the saw blade is located on the left side of the first housing.
- the cutting tool provided according to the present invention includes a first housing and a second housing.
- the first housing has a first end for connecting the second housing and a second end for connecting a power supply device; the second housing
- the body contains a brushless motor and a transmission device; and when the fan rotates, the motor and the circuit board are arranged in the cooling air flow path.
- Fig. 1 is a perspective view of a cutting tool provided by the first embodiment of the present invention
- Figure 2 is a front view of the cutting tool shown in Figure 1, when the cutting tool is at the maximum depth of cut;
- Figure 3 is a rear view of the cutting tool shown in Figure 1;
- Figure 4 is a top view of the cutting tool shown in Figure 1;
- Figure 5 is a front view of the cutting tool shown in Figure 1, when the cutting tool is at the minimum depth of cut;
- Figure 6 is a structural schematic diagram of the cutting tool shown in Figure 1 that can be effectively supported by the bottom plate when cutting a workpiece, at this time, the movable shield is in a folded state;
- Fig. 7 is a structural diagram of the cutting tool shown in Fig. 1 that can be effectively supported by the bottom plate when it is standing still. At this time, the saw blade has been removed and the movable shield is in a folded state;
- Figure 8 is a front view of the cutting tool shown in Figure 1 after extending the bottom plate;
- Figure 9 is a right side view of the cutting tool shown in Figure 1, the main part is shown in cross-section, in which the first housing has been removed;
- Fig. 10 is a structural diagram of the cutting tool shown in Fig. 3 after the right half shell is removed;
- Fig. 11 is a three-dimensional structure diagram of the cutting tool shown in Fig. 1 from another angle of view. At this time, the cutting tool is in the minimum cutting depth state;
- FIG. 12 is a plan view for describing the cooling air flow of the first embodiment, in which the main part is shown in cross section;
- FIG. 13 is a plan view for describing the cooling air flow of the second embodiment, in which the main part is shown in cross section;
- FIG. 14 is a plan view for describing the cooling airflow of the third embodiment, in which the main part is shown in cross section;
- 15 is a plan view for describing the cooling airflow of the fourth embodiment, in which the main part is shown in cross section;
- Figure 16 is a rear view of the cutting tool provided by the fifth embodiment of the present invention.
- Figure 17 is a structural diagram of the cutting tool shown in Figure 16 after the right half shell is removed;
- Fig. 18 is a plan view for describing the cooling airflow of the fifth embodiment, in which the main part is shown in cross section;
- 19 is a plan view for describing the cooling airflow of the sixth embodiment, in which the main part is shown in cross section;
- FIG. 20 is a front view of the cutting tool provided by the seventh embodiment of the present invention.
- Figure 21 is a rear view of the cutting tool shown in Figure 20;
- FIG. 22 is a structural diagram of the cutting tool shown in FIG. 21 after removing the right half shell, wherein the circuit board is arranged in the second end of the first shell;
- FIG. 23 is a plan view for describing the cooling airflow of the seventh embodiment, in which the main part is shown in cross section;
- 24 is a plan view for describing the cooling airflow of the eighth embodiment, in which main parts are shown in cross section;
- 25 is a plan view for describing the cooling airflow of the ninth embodiment, in which the main part is shown in cross section;
- the first embodiment of the present invention provides a cutting tool 100, in particular an electric circular saw, including: an output shaft 14 for mounting the saw blade 12;
- the motor has a motor shaft; a transmission device arranged between the output shaft 14 and the motor shaft is used to transmit the movement of the motor to the output shaft 14;
- the housing 20 is used to house the motor, transmission device and other parts;
- the assembly, attached to the housing 20, includes a fixed guard 24 for covering the upper half of the saw blade 12 and a movable guard 26 rotatable relative to the fixed guard 24;
- the bottom plate 28 is movably connected to the fixed guard 24 via the fixed guard 24
- a bottom surface 29 of a bottom plate for contact with a workpiece is formed thereon.
- the bottom plate 28 has a saw blade through hole 22 through which the saw blade 12 can protrude downward from the bottom surface 29 of the bottom plate.
- directional terms such as front, back, left, right, up and down, etc., are relative to the direction of normal use of the cutting tool 100, for example, the forward direction of the cutting tool 100 is defined as Front, the direction opposite to the advancing direction of the cutting tool 100 is rear and so on.
- the housing 20 includes a first housing 21 and a second housing 23 connected to the first housing 21.
- the first housing 21 is symmetrically arranged with respect to the first plane P.
- the plane where the saw blade 12 is defined is the saw blade plane
- the first plane P is parallel to the saw blade plane.
- the first housing 21 extends in the longitudinal direction, and has a first end and a second end respectively located in the extending direction thereof.
- the extension direction of the first housing 21 is defined as the first axis X direction.
- the first end of the first housing 21 close to the output shaft 14 is connected to the second housing 23; the second end of the first housing 21 away from the output shaft 14 is connected to the power supply device 30.
- the power supply device 30 is used to provide power for the cutting tool 100.
- the second end of the first housing 21 is provided with a coupling portion 210, and the coupling portion 210 is used to connect the power supply device 30.
- the power supply device 30 is a battery pack
- the coupling part 210 is used to detachably connect the battery pack 30.
- the middle position of the first housing 21 is configured as a handle 211, which is convenient for the user to grasp when using the cutting tool 100 to perform a cutting operation.
- a safety switch 32 and a power switch 34 are provided near the handle 211.
- the power switch 34 is used to turn on or turn off the motor.
- the power switch 34 can only be triggered when the safety switch 32 is pressed. In other words, the motor can be started only after two actions. Thus, the danger caused by a single operation is avoided.
- the user grasps the handle portion 211 the user's hand grasping the handle portion 211 can trigger the safety switch 32 and the power switch 34 to turn on or turn off the cutting tool 100.
- a circuit board is also provided inside the first housing 21, and one or all of the drive circuit and the control circuit are mounted on the circuit board.
- the drive circuit includes a switching element, which is triggered by a power switch 34 for switching and supplying to the motor.
- the power; the control circuit is used to drive the aforementioned drive circuit.
- the first housing 21 is assembled from a left half-shell 212 and a right half-shell 213 symmetrical about the first plane P by screws.
- the left half shell 212 is fixedly connected to the fixed shield 24 by screws.
- the first housing 21 may also be integrally formed.
- "Integrally" should in particular be understood as at least materially connected, for example through welding processes, bonding processes, injection processes and/or other processes deemed meaningful by the skilled person, and/or advantageously understood as being in one block Forming, for example, by casting from a casting and/or by a single-component or multi-component injection molding method and preferably manufactured from a single blank.
- first housing 21 and the second housing 23 may also be integrally formed.
- the second housing 23 is arranged at the first end of the extension direction of the first housing 21, and is roughly cylindrical, and houses a motor and a transmission device in it, and the axis of the motor shaft and the output
- the axis of the shaft is parallel and perpendicular to the plane of the saw blade.
- the axis of the motor shaft is also perpendicular to the first axis X direction of the first housing 21.
- the second housing 23 is assembled from the motor housing portion 25 and the reduction gear box 27 with screws.
- the motor 16 is accommodated in the motor accommodating portion 25, and the transmission device is accommodated in the reduction box 27.
- the fixed shield 24, the reduction box 27, and the motor receiving portion 25 are arranged in sequence, and the three are fixedly connected by screws.
- the shield assembly adopts a conventional design in the prior art, which includes a fixed shield 24 with an arc structure and a movable shield 26 that rotates relative to the fixed shield 24.
- the fixed shield 24 is located on the left side of the reduction box 27.
- the fixed shield 24 is fixedly connected to the reduction gear box 27.
- the movable shield 26 is sleeved in the fixed shield 24 and can rotate around the axis of the output shaft 14 to be folded into the fixed shield 24.
- the output shaft 14 extends into the fixed shield 24, and the saw blade 12 and the output shaft 14 are detachably connected.
- different types of saw blades 12 can be used according to the material of the object to be cut.
- the saw blade 12 is arranged in a fixed guard 24, and almost half of its outer circumference is covered by a fixed guard 24.
- the movable guard 26 rotates in the fixed guard 24 to block or leak the lower half of the saw blade 12.
- the operator manually pushes the opening member 25 to rotate the movable shield 26 to expose part of the serrations. .
- the bottom plate 28 is movably connected with the fixed shield 24.
- a connecting seat 38 is provided on the front side of the bottom plate 28, and the connecting seat 38 is pin-connected to the fixed shield 24 so that the fixed shield 24 can rotate relative to the bottom plate 28.
- the axis on which the pin is defined is the pivot axis X1.
- the pivot axis X1 is parallel to the axis of the motor shaft.
- the cutting depth of the cutting tool 100 is defined as the distance that the saw blade 12 protrudes from the bottom surface 29 of the base plate.
- the handle portion 211 drives the fixed shield 24 to rotate until the distance that the saw blade 12 protrudes from the bottom surface 29 of the bottom plate is the maximum, the cutting tool 100 is at the maximum cutting depth position, and the cutting depth at this time is the maximum cutting depth, as shown in FIG. 2.
- the handle 211 drives the fixed shield 24 to rotate until the distance between the saw blade 12 and the bottom surface 29 of the base plate is the smallest, the cutting tool 100 is at the minimum cutting depth position, and the cutting depth at this time is the minimum cutting depth, as shown in FIG. 5.
- the cutting tool 100 also includes a fixed-depth adjustment mechanism and a fixed-depth locking mechanism.
- the fixed-depth adjustment mechanism includes a longitudinally extending fixed-depth slide rail 31 provided on one of the bottom plate 28 and the housing 20, and a fixed-depth slide rail 31 provided on the other of the bottom plate 28 and the housing 20. Depth sliding member 33.
- the fixed-depth slide rail 31 may be an arc-shaped guide rail, and the center of the circle corresponding to the arc in which the guide rail is located is located on the pivot axis X1.
- the extending direction of the fixed depth slide rail 31 can also be approximately perpendicular to the bottom surface 29 of the bottom plate.
- the fixed depth slider 33 slides in the fixed depth slide rail 31 to adjust the distance that the saw blade 12 extends from the bottom surface 29, thereby adjusting the saw blade. 12 cutting depth.
- the extension direction of the fixed depth slide rail 31 is substantially perpendicular to the bottom surface 29 and does not require the fixed depth slide rail 31 to extend along a straight line, as long as it has a longitudinal extension direction substantially perpendicular to the bottom surface 29.
- the fixed-depth locking mechanism can keep the fixed-depth sliding member 33 at a certain position relative to the slide rail 31, so that the saw blade 12 can maintain a certain distance from the bottom surface 29, so that a groove of a certain depth can be cut in the workpiece.
- the fixed-depth locking mechanism can be a conventional structure such as a threaded locking mechanism, a cam locking mechanism, etc., and the details are not repeated here.
- the fixed depth adjusting mechanism and the fixed depth locking mechanism are provided on one side of the right half shell 213.
- the fixed-depth slide rail 31 is fixedly arranged on the bottom plate 28. In the cutting travel direction of the cutting tool, the depth-fixing slide rail 31 is located on the right side of the first housing 21.
- the fixed-depth sliding member 33 is fixedly arranged on the first housing 21.
- the second housing 23 is distributed on both sides of the first plane P, and the coupling portion 210 is also arranged symmetrically with respect to the first plane P, which is beneficial for the center of gravity of the entire cutting tool 100 to be along a vertical axis to the first plane P.
- the direction is set closer to the first plane P, so the center of gravity of the entire cutting tool 100 can be closer to the middle position of the handle 211, so that when the user uses the cutting tool 100, the stability is higher and the vibration is smaller.
- the second housing 23 may also be integrally provided with the aforementioned reduction gear box 27 and the motor receiving portion 25.
- the bottom plate 28 is a rectangular bottom plate, the length direction of which is the cutting travel direction of the cutting tool 100 (the direction indicated by the arrow b in FIG. 2 ), and the width direction thereof is perpendicular to the cutting travel direction of the cutting tool 100.
- the bottom plate 28 includes a long side 281 extending along the cutting travel direction of the cutting tool 100 and a short side 282 perpendicular to the long side 281.
- the long side 281 includes a left side and a right side disposed oppositely.
- the short side 282 includes a front side and a rear side disposed oppositely, the front side is disposed forward, and the rear side is disposed rearward.
- the bottom plate 28 may have other shapes, for example, the bottom plate is a circular bottom plate.
- the cutting tool 100 By designing the projection of the center of gravity of the cutting tool 100 to fall on the bottom plate 28 in the direction perpendicular to the bottom surface 29 of the bottom plate, so that the center of gravity of the cutting tool 100 is set forward; thus when the cutting tool 100 is placed horizontally through the bottom plate 28 When on the work surface, it can be effectively supported by the bottom plate 28. At this time, the user does not need to apply a force parallel to the direction of the motor shaft on the cutting tool 100, and the cutting tool 100 will not tip over, which improves the user experience. It should be noted that the cutting tool 100 mentioned here refers to the cutting tool 100 to which the battery pack 30 is not connected.
- the main purpose of arranging the center of gravity of the cutting tool 100 is how to arrange the motor and the reduction gear.
- the projection of the reduction box 27 is designed to fall on the bottom plate 28, and the projection of the motor accommodating portion 25 is designed to fall on the bottom plate 28 at least partially.
- the projection of the center of gravity of the cutting tool 100 can fall on the bottom plate 28.
- the cutting tool 100 is powered by the battery pack 30.
- the connection method (including electrical connection and mechanical connection) of the connecting portion 210 and the battery pack 30 is a commonly used connection method in the prior art, and the detailed description thereof is omitted here. It should be noted that when the cutting tool 100 is connected to the battery pack 30 through the joint 210, the projection of the center of gravity of the cutting tool 100 still falls on the bottom plate 28 in the direction perpendicular to the bottom surface 29 of the bottom plate.
- the cutting tool 100 may also be powered in other ways, such as by providing a cable plug on the cutting tool 100 to connect to the mains power, or connecting to the mains power through an adapter.
- the projection of the center of gravity of the cutting tool 100 is designed to fall on the bottom plate 28 , so that the center of gravity of the cutting tool 100 is set forward, so that when the cutting tool 100 is placed horizontally on the work surface through the bottom plate 28, regardless of whether the cutting tool 100 is in use or standing, regardless of the cutting depth of the cutting tool 100, the cutting The tool 100 can be effectively supported by the bottom plate 28 and placed on the work surface stably without tipping, which improves the user experience.
- the projection of the center of gravity of the cutting tool 100 is designed to fall on the bottom plate 28, so that when the cutting tool 100 passes through the bottom plate 28 When placed horizontally on the work surface, regardless of whether the cutting tool 100 is in use or standing still, regardless of the cutting depth of the cutting tool 100, the cutting tool 100 can be effectively supported by the bottom plate 28 and placed on the work surface stably.
- the battery pack 30 is slidingly connected to the joint 210.
- the joint 210 defines a removal axis Y.
- the joint 210 includes a first part 2101 at one end of the removal axis Y and a first part 2101 at one end of the removal axis Y. Except for the second part 2102 at the other end of the axis Y, the second part 2102 is closer to the output shaft 14 than the first part 2101.
- the lower end of the coupling part 210 is closer to the output shaft 14.
- the center of gravity of the battery pack 30 is set more forward, which is beneficial to the balance of the cutting tool 100.
- the direction of the removal axis Y defined by the joint 210 is the sliding direction of the battery pack 30.
- the angle formed by the first axis X of the longitudinal extension direction of the first housing 21 and the sliding direction Y of the battery pack 30 is ⁇ , and the angle range of ⁇ is between 15° and 90. Moreover, when ⁇ is 90°, when the sliding direction Y of the battery pack 30 is perpendicular to the extension direction of the handle 211, the center of gravity of the battery pack 30 is further forward, so that the center of gravity of the cutting tool 100 is further forward, and the center of gravity of the cutting tool 100 is further forward. The stability is better.
- the cutting tool 100 can be effectively supported by the bottom plate 28 during the cutting operation.
- the bottom plate 28 when cutting, the bottom plate 28 is placed on the work surface B, and the bottom surface 29 of the bottom plate is in contact with the work surface B.
- the work surface B can be the object to be cut or the guide placed above the object.
- the bottom plate One of the purposes of 28 is to contact the working surface B to make the cutting stable, and the other purpose is to make the whole machine stable and prevent tipping;
- Another possible situation is that when the cutting tool 100 is placed on the bottom plate 28, it can be effectively supported by the bottom plate 28 without falling over.
- the saw blade 12 has been removed, and the movable shield 26 is housed in the fixed shield 24.
- the working table surface B can be used to place the cutting tool 100 The storage surface of the shelf.
- the cutting tool 100 is not affected by other external forces, and the cutting tool 100 can be effectively supported by the bottom plate 28 without falling.
- the size of the bottom plate 28 is a conventional size, and the center of gravity of the cutting tool 100 is changed by rationally arranging the second housing 23 containing the transmission device and the motor.
- the cutting tool 100 can be effectively supported by increasing the size of the bottom plate 28.
- the size of the bottom plate 28 may not be larger, and the size of the bottom plate 28 should be designed within a reasonable range based on the consideration of the sense of operation.
- the dashed part of the bottom plate 28' is an increased part of the existing conventional size bottom plate 28, and the size of the bottom plate 28' can be selected according to the saw blade 12 used. Specifically, when assembling a saw blade 12 with a diameter in the range of 80-90mm, the preferred length range of the bottom plate 28': 150-220mm, which can be enlarged to 280mm; and when assembling a saw blade 12 with a diameter in the range of 110-130mm, the bottom plate 28' 'Preferred length range: 190-245mm, can be enlarged to 300mm.
- the bottom plate 28' of the cutting tool 100 is a detachable structure, so when a different type of saw blade 12 is assembled, the bottom plate 28' of a different size can be replaced.
- the transmission device is a single-stage transmission, and the transmission ratio ranges from 2 to 6.5.
- the transmission device includes a driving gear 38 supported on the motor shaft 17 and a driven gear 40 supported on the output shaft 14.
- the driving gear 38 moves synchronously with the motor shaft 17, and the output shaft 14 moves synchronously with the driven gear 40.
- the driving gear 38 drives the driven gear 40 to rotate, thereby driving the saw blade 12 mounted on the output shaft 14 to rotate to cut the workpiece.
- the end of the motor shaft 17 is integrally provided with the aforementioned driving gear 38; the output shaft 14 is fixedly connected with a driven gear 40, for example, the driven gear 40 is connected to the output shaft 14 through a key connection.
- the cutting depth of the cutting tool 10 is the distance that the saw blade 12 protrudes from the bottom surface 29 of the base plate. That is to say, during the cutting process of the cutting tool 10, only the part of the saw blade 12 passing through the through hole 22 can realize the cutting function.
- cutting tools 10 with different specifications mentioned here all refer to the cutting tools 10 with a single-stage gear transmission.
- the rotation speed of the saw blade 12 affects the cutting quality and cutting efficiency of the cutting tool 10.
- the higher the rotation speed of the saw blade 12 the higher the quality of sawing and the higher the efficiency of sawing.
- too high rotation speed may cause the serrations to be thrown away from the saw blade body; and too high rotation speed also represents a certain degree of danger. Therefore, it is necessary to select a reasonable speed range to bring a good cutting quality and a win-win operation safety.
- the rotation speed of the saw blade 12 of the cutting tool 10 is between 4500-6500 rpm.
- the speed range of the motor 16 of the conventional cutting tool 10, especially the electric circular saw is between 10000-35000 rpm, and thus it is determined that the transmission ratio of the cutting tool 10 is between 2 and 6.5.
- the transmission ratio can be expressed as the ratio between the rotation speed of the motor 16 and the rotation speed of the saw blade 12, or can be expressed as the gear ratio between the driven gear 40 and the driving gear 36 in a single-stage transmission device.
- the number of teeth of the driving gear 38 applied to the cutting tool 10 is relatively fixed.
- the number of teeth of the driving gear 38 rotatably supported on the motor shaft 17 is between 5-8. Therefore, the number of teeth of the driven gear 40 in this embodiment can be roughly estimated, and the number of teeth of the driven gear is between 12-35.
- m represents the modulus of the gear
- z represents the number of teeth of the gear.
- the modulus of the gear is positively related to the strength of the gear teeth and the life of the gear. That is, the greater the module of the gear, the higher the strength of the gear teeth, and the longer the life of the gear meshing transmission.
- the diameter size of the gear also increases, which is not conducive to the increase of the maximum cutting depth of the cutting tool 10. For this reason, it is necessary to take into account the life of the gear and the maximum cutting depth of the cutting tool, and choose the module of the gear reasonably.
- the motor 16 is an inner rotor motor, and the rotation speed of the inner rotor motor is in the range of 20000-35000 rpm.
- the cutting tool 100 using an inner rotor motor has a transmission ratio ranging from 3 to 6.5. Preferably, the transmission ratio ranges between 4-5.
- the motor 16 is an external rotor motor, and the rotation speed of the external rotor motor is in the range of 10000-15000 rpm.
- the cutting tool 100 using an external rotor motor has a transmission ratio ranging between 2-3.
- the transmission ratio is in the range of 2-2.5.
- the cutting tool 100 of this embodiment has a gear ratio ranging between 2 and 6.5, and the number of teeth of the driven gear 40 is between 12 and 35.
- the maximum depth of cut of the cutting tool 10 will be greater than 38mm.
- the motor accommodating portion 25 and the handle portion 211 for accommodating the motor 16 are provided independently.
- the size of the handle portion 211 can be designed within a reasonable range without being limited by the size of the motor 16, so as to achieve a good holding experience.
- the radial circumference of the handle portion 211 is about 140 mm, which is smaller than the radial dimensions of the first end and the second end of the first housing 21; the motor is a brushless motor.
- the brushless motor 16 has a higher output power than the brush motor; but at the same time, the heat dissipated by the brushless motor 16 itself will also increase; and the circuit board used to control the power supply of the motor 16 The heat emitted will also increase.
- the cutting tool 100 is also provided with a heat dissipation device.
- the heat dissipation device includes a heat dissipation fan 42 and a heat dissipation fin 44.
- the heat dissipation fan 42 is driven by the motor shaft 17 to generate cooling airflow;
- the heat dissipation fin 44 is formed with heat dissipation ribs for guiding the flow direction of the cooling airflow.
- the cooling fan 42 is fixedly installed on the motor shaft 17. When the motor 16 is started, the cooling fan 42 rotates synchronously to generate a cooling airflow.
- the heat sink 44 is fixedly connected with the circuit board, and uses the principle of heat conduction to conduct the heat generated by the circuit board to itself, and then is cooled by the cooling airflow, thereby dissipating heat for the circuit board.
- the heat sink 44 is designed into a plate-like structure to maximize the contact area with the circuit board.
- the cutting tool 100 In order to generate cooling air flow, the cutting tool 100 also needs to be provided with cooling air holes.
- the location of the cooling air holes must be such that the cooling air flow can at least flow through the circuit board and the motor 16 so as to be able to dissipate the circuit board and the motor 16.
- the circuit board and the motor 16 need to be arranged in the circulation path of the cooling air flow. In this way, when the motor 16 is started and the cooling fan 42 rotates, external air can flow into the cutting tool 100 through the cooling air holes to form a cooling airflow; and, in the process of flowing to the cooling fan 42, the cooling airflow flows through at least the circuit board and The motor 16 finally flows out through the cooling air hole.
- the circuit board 36 is arranged at the first end of the first housing 21, and the heat dissipation fan 42 is arranged at the end of the motor shaft 17 close to the saw blade 12. Further, it is defined that a reference plane passing through the motor shaft and perpendicular to the plane of the saw blade is defined as a reference plane, and the circuit board 36 is located on the side of the reference plane close to the second end and does not intersect the reference plane.
- a cooling air hole is also provided on the casing 20.
- the cooling air hole communicates with the inside and the outside of the housing 20 and includes: a first air inlet hole 46, as shown in FIG. 10; a second air inlet hole 48, as shown in FIG. 1; and a first air outlet hole 50, as shown in FIG. 11 Shown.
- the first air inlet hole 46 is opened on the end face of the second housing 23 opposite to the saw blade 12; that is, the first air inlet hole 46 is opened on the end face of the second housing 23 away from the saw blade 12 .
- the second air inlet 48 is opened in the left half shell 212 and is located between the saw blade plane and the circuit board 36; the first air outlet 50 is opened in the second shell 23 and is located on the radially outer side of the fan 42.
- the circuit board 36 is arranged on the radially outer side of the fan 42, the negative pressure generated by the rotation of the heat dissipating fan 42 inside the air guide ring 52 is effectively used to generate the air flow through the circuit board 36 from the second air inlet hole 48. Cooling airflow.
- the housing 20 is also provided with a first rib assembly for guiding the cooling air flow in the housing 20.
- the first rib assembly mainly includes a first rib 35 disposed in the second housing 23, and the cooling airflow is defined by the first rib 35 and the inner wall of the second housing 23. Flow in space.
- the power switch 34 is normally triggered, the motor 16 is activated, and the saw blade 12 rotates, thereby cutting the workpiece to be cut.
- the heat dissipation fan 42 rotates to form a negative pressure, which drives external air into the cutting tool 100 to dissipate heat.
- the cooling airflow includes a first cooling airflow and a second cooling airflow.
- the first cooling airflow enters the interior of the housing 20 from the first air inlet 46, first flows through the motor 16, and flows out of the housing 20 from the first air outlet 50; the second cooling air enters from the second air inlet 48
- the casing 20 flows through the circuit board 36 and the motor 16 successively, and finally flows out from the first air outlet 50.
- the second cooling airflow first flows through the circuit board 36 and the heat sink 44 to dissipate heat; then the second cooling airflow is guided to the second housing 23 away from the saw
- the end of the fin 12 merges with the first cooling airflow entering the interior of the cutting tool 100 through the first air inlet 46, and flows through the space defined by the rotor and the stator of the motor 16 to dissipate heat for the motor 16. Therefore, the cutting tool 100 of this embodiment can provide more airflow for the motor 16 to dissipate heat, and the motor 16 can dissipate heat more adequately.
- the heat sink 44 includes a plurality of fin-shaped ribs.
- the circuit board 36 is arranged in the housing 20, in order to reduce the flow resistance of the cooling airflow and optimize the cooling effect, the extending direction of the space defined by the adjacent flaky ribs will follow the flow direction of the cooling airflow.
- the heat dissipation scheme of the cutting tool of the present invention will also change.
- the cutting tool 100a provided by the second embodiment of the present invention has basically the same structure as the cutting tool 100 provided by the first embodiment. The difference is that the rib assembly that guides the airflow has a different configuration. . Specifically, in the cutting tool 100 a of this embodiment, a second rib assembly is formed inside the housing 20.
- the heat dissipation fan 42 is arranged at the end of the motor shaft 17 close to the saw blade 12; the circuit board 36 is arranged at the first end of the first housing 21 and is located at One side of the aforementioned reference plane.
- the cooling air holes include a first air inlet 46a, a first air outlet 50a and a second air outlet 52a.
- the first air inlet 46a is provided on the end surface of the second housing 23 opposite to the saw blade 12;
- the first air outlet 50a is provided on the second housing 23 and is located on the radially outer side of the fan 42;
- the air outlet 52 a is opened on the left half shell 212 and is located between the plane of the saw blade and the circuit board 36.
- the cooling fan 42 rotates to form a negative pressure, which drives external air into the inside of the housing 20.
- the cooling airflow includes a first cooling airflow that enters the housing 20 from the first air inlet 46a and flows out from the first air outlet 50a. The first cooling airflow dissipates heat for the motor 16.
- the cooling airflow also includes entering the housing 20 from the first air inlet 46a and from the second air outlet 52a.
- the second cooling air flow out of the housing 20.
- the second cooling airflow first flows through the motor 16 to dissipate heat from the motor 16, and then flows through the circuit board 36 to dissipate heat from the circuit board 36, and finally flows out from the second air outlet 52a.
- the cutting tool 100b provided in the third embodiment of the present invention has basically the same structure as the cutting tool 100 provided in the first embodiment, and the difference is that the installation position of the cooling fan 42 is different. Specifically, the heat dissipation fan 42 is arranged at an end of the motor shaft 17 away from the saw blade 12.
- the cooling air hole includes a first air inlet hole 46b and a first air outlet hole 50b.
- the first air inlet 46b is opened in the second housing 23, and in a direction parallel to the motor shaft 17, the first air inlet 46b is located between the motor 16 and the transmission device.
- the first air outlet 50 b is opened in the left half shell 212 between the plane of the saw blade and the circuit board 36.
- the cooling fan 42 rotates to form a negative pressure, which drives external air into the housing 20.
- the heat-dissipating airflow includes a first cooling airflow that enters the housing 20 from the first air inlet 46b and flows out of the housing 20 from the first air outlet 50b.
- the first cooling airflow first flows through the motor 16 to dissipate heat for the motor 16; then flows through the circuit board 36 to dissipate heat for the circuit board 36.
- the cutting tool 100c provided by the fourth embodiment of the present invention has basically the same structure as the cutting tool 100 provided by the first embodiment, and the difference is that the heat dissipation fan 42 and the rib assembly are different. Specifically, the heat dissipation fan 42 is arranged at an end of the motor shaft 17 away from the saw blade 12; and the aforementioned second rib assembly is formed inside the housing 20.
- the cooling air holes include a first air inlet 46c, a second air inlet 48c, and a first air outlet 50c.
- the first air inlet 46c is opened in the left half shell 212, located between the saw blade plane and the circuit board 36;
- the second air inlet 48c is opened in the second housing 23, and in the direction parallel to the motor shaft 17 Above, the second air inlet 48c is located between the motor 16 and the transmission device;
- the first air outlet 50c is opened in the second housing 23 and is located radially outside of the heat dissipation fan 42.
- the cooling fan 42 rotates to drive external air into the inside of the housing 20.
- the cooling airflow includes a first cooling airflow that enters the housing 20 from the first air inlet 46c and flows out of the housing 20 from the first air outlet 50c, and flows into the housing 20 from the second air inlet 48c and flows from the first air inlet 48c.
- An air outlet 50c flows out of the second cooling airflow from the housing 20.
- the first cooling airflow flows through the circuit board 36 and the motor 16 successively to dissipate heat.
- the position of the circuit board 36 is fixed. That is, the circuit boards 36 are all arranged at the first end of the first housing 21, which is located on the side of the reference plane close to the second end.
- the circuit board 36 may also be arranged in other positions of the housing 20. As shown in FIGS. 16-19, the circuit board 36 may be provided with the first end of the first housing 21 and pass through the aforementioned reference plane. That is, the circuit board 36 intersects the reference plane.
- Figures 16-18 show a cutting tool 100d according to a fifth embodiment of the present invention.
- the circuit board 36 is arranged at the first end of the first housing 21 and passes through the aforementioned reference plane; and the heat dissipation fan 42 is arranged at the end of the motor shaft 17 close to the saw blade 12, and the housing 20 is formed with The aforementioned first rib assembly.
- the cooling air holes include a first air inlet 46d, a second air inlet 48d, and a first air outlet 50d.
- the first air inlet 46d is opened on the end surface of the second housing 23 opposite to the saw blade 12;
- the second air inlet 48d is opened on the left half of the housing 212, located between the plane of the saw blade and the circuit board 36 ;
- the first air outlet 50d is opened in the second housing 23, located at the radial outer side of the cooling fan 42.
- the motor 16 is started, the cooling fan 42 rotates, and external air is driven into the housing 20.
- the cooling airflow includes a first cooling airflow and a second cooling airflow.
- the first cooling airflow enters the housing 20 from the first air inlet 46d, and after flowing through the motor 16, flows out of the housing 20 from the first air outlet 50d;
- the second cooling airflow enters from the second air inlet 48d Inside the housing 20, it flows through the circuit board 36, the motor 16, and finally flows out from the first air outlet 50d.
- the cutting tool 100e provided in the sixth embodiment of the present invention has basically the same structure as the cutting tool 100d provided in the fifth embodiment, and the difference lies in that the dissipating fan 42 and the rib assembly are arranged differently. Specifically, the heat dissipation fan 42 is arranged at an end of the motor shaft 17 away from the saw blade 12, and a second rib assembly is formed inside the housing 20.
- the cooling air holes include a first air inlet 46e, a second air inlet 48e and a first air outlet 50e.
- the first air inlet 46e is opened on the left half shell 212, located between the saw blade plane and the circuit board 36;
- the second air inlet 48e is opened on the second housing 23, and is parallel to the motor shaft 17 along the edge.
- the second air inlet 48e is located between the motor 16 and the transmission device;
- the first air outlet 50e is opened in the second housing 23 and is located on the radially outer side of the fan 42.
- the cooling airflow includes a first cooling airflow that enters the housing 20 from the first air inlet 46e, and flows out of the housing 20 from the first air outlet 50e, and flows into the housing 20 from the second air inlet 48e, and flows from The second cooling airflow flowing out of the casing 20 from the first air outlet 50e.
- the first cooling airflow first passes through the circuit board 36 to dissipate heat from the circuit board 36, then flows through the motor 16, dissipates heat from the motor 16, and finally flows out from the first air outlet 50e.
- the circuit board 36 may also be arranged at the second end of the first housing 21, close to the power supply device 30, as shown in FIGS. 20-25.
- Figures 20-23 show a cutting tool 100f according to a seventh embodiment of the present invention.
- the circuit board 36 is arranged at the second end of the first housing 21; and the heat dissipation fan 42 is arranged at one end of the motor shaft 17 close to the saw blade 12.
- the cooling air holes include a first air inlet 46f, a first air outlet 50f, and a second air outlet 52f.
- the first air inlet 46f is opened at the end of the second housing 23 opposite to the saw blade 12.
- the end surface of the second housing 23 opposite to the saw blade 12 and the outer peripheral surface are both provided with a first air inlet 46f.
- the first air outlet 50 f is opened in the second housing 23 and located on the radially outer side of the fan 42; the second air outlet 52 f is opened at the second end of the first housing 21 and is located close to the circuit board 36.
- the housing 20 is also provided with a third rib assembly for guiding the flow of the cooling airflow in the housing 20.
- the cooling fan 42 rotates to drive external air into the inside of the housing 20.
- the cooling airflow includes a first cooling airflow entering the housing 20 from the first air inlet 46f and out of the housing 20 from the first blowing hole 50f, and from the first air inlet 46f enters the interior of the housing 20 and flows out of the second cooling airflow of the housing 20 from the second air outlet 52f.
- the first cooling airflow dissipates heat for the motor 16, and the second cooling airflow sequentially flows through the motor 16 and the circuit board 36 to dissipate heat.
- the cutting tool 100g provided by the eighth embodiment of the present invention has basically the same structure as the cutting tool 100f provided by the seventh embodiment, and the difference lies in that the arrangement of the rib assembly is different. Specifically, a fourth rib assembly is formed inside the housing 20.
- the heat dissipation fan 42 is arranged at one end of the motor shaft 17 close to the saw blade 12.
- the composition and function of the cooling air holes have changed.
- the cooling air holes include a first air inlet 46g, a second air inlet 48g, and a first air outlet 50g.
- the first air inlet 46g is opened on the end of the second housing 23 away from the saw blade 12;
- the second air inlet 48g is opened on the first housing 21 and is located close to the circuit board 36;
- the first air outlet 50g is opened in the second housing 23 and located on the radially outer side of the heat dissipation fan 42.
- the cooling fan 42 rotates to drive external air into the inside of the housing 20.
- the cooling airflow includes a first cooling airflow that enters the housing 20 from the first air inlet 46g and flows out of the housing 20 from the first air outlet 50g, and from the second air inlet 48g enters the casing 20 and flows out of the second cooling airflow of the casing 20 from the first air outlet 50g.
- the first cooling airflow dissipates heat for the motor 16, and the second cooling airflow sequentially flows through the circuit board 36 and the motor 16 to dissipate heat.
- the cutting tool 100h provided in the ninth embodiment of the present invention has basically the same structure as the cutting tool 100f provided in the seventh embodiment, and the difference lies in that the setting of the cooling fan 42 is different.
- the heat dissipation fan 42 is arranged at an end of the motor shaft 17 away from the saw blade 12.
- the cooling air holes include a first air inlet 46h, a second air inlet 48h and a first air outlet 50h.
- the first air hole 46h is provided with a second housing 23, and in a direction parallel to the motor shaft 17, the first air inlet 46h is located between the motor 16 and the transmission device; the second air inlet 48h is opened in The first housing 21 is arranged close to the circuit board 36; the first air outlet 50h is opened at the end of the second housing 23 opposite to the saw blade 12. Specifically, the first air outlet 50h is opened on the end surface and the circumferential surface of the second housing 23.
- the cooling fan 42 rotates to drive external air into the inside of the housing 20.
- the cooling airflow includes the first cooling airflow entering the housing 20 from the first air inlet 46h and out of the housing 20 from the first air outlet 50h, and from the second air inlet 48h enters the casing 20 and flows out of the second cooling airflow of the casing 20 from the first air outlet 50h.
- the first cooling airflow flows through the motor 16 to dissipate heat for the motor 16; the second cooling airflow sequentially flows through the circuit board 36, and the motor 16 dissipates heat.
- the circuit board 36 may also be arranged in the second housing 23.
- the space for accommodating the circuit board 36 is directly formed on the second housing 23, and the first housing 21 extends from the handle portion along the first axis X.
- the circuit board 36 is arranged in the housing 20 and is located between the pivot axis X1 and the holding portion 211.
- the circuit board 36 may be provided independently of the first housing 21 and the second housing 23.
- the cooling airflow can also flow through the circuit board 36 and the motor 16 to dissipate heat.
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Abstract
一种切割工具(100),包括:输出轴(14);无刷电机;风扇(42);传动装置;电路板(36);壳体(20),包括第一壳体(21)和第二壳体(23);第一壳体(21)具有在其延伸方向的第一端和第二端;第一端用于连接第二壳体(21),第二端用于连接电源装置(30);第二壳体(23)收容电机(16)与传动装置;第一壳体(21)还设有把手部(211),当用户抓握把手部(211)进行切割操作时,锯片(12)位于第一壳体(21)的左侧;并且,当风扇(42)转动时,电机(16)以及电路板(36)均布置在冷却气流的通路中。与现有技术相比,提供的切割工具通过合理的结构设计以及高速电机的选用,取得了高效率以及散热良好的技术效果。
Description
本申请要求了申请日为2019年12月6日,申请号为201922178356.5的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本发明涉及一种切割工具,尤其是一种电圆锯。
近年来,为了尺寸以及高效率,已研究用于手提式电动圆锯的新型布局方式。该布局方式包括如下的结构:主机壳体包括第一壳体和第二壳体;第一壳体纵长延伸,包括用于连接第二壳体的第一端以及用于连接电源装置的第二端,并且第一壳体的中部位置被构造为供用户抓握的把手;第二壳体内收容电机和传动机构。
区别于传统的将电机布置在把手的布局方式,此种布局可以不受电机尺寸的限制,将把手的径向尺寸设计在合理的范围内,方便握持;但该类电圆锯仍采用传统的有刷电机,电机尺寸大且切割效率低;而采用无刷电机的电圆锯一般采用D形手柄布局,整机结构尺寸大,便携性差,并且无刷电机本身也会出现输出热量大幅增加的情况。
发明内容
本发明所要解决的技术问题是提供一种电圆锯,其通过结构的合理设计以及无刷电机的采用,解决了切割效率低以及散热差的技术问题。
为解决上述技术问题,本发明的技术方案是:一种切割工具,包括:输出轴,用于安装锯片;电机,用于驱动所述输出轴转动;所述电机为无刷电机,并具有电机轴;风扇,由所述电机轴驱动,用于产生冷却气流;传动装置,设置在所述输出轴与所述电机轴之间,用于将所述电机的动力传递给所述输出轴,并且所述电机轴与输出轴平行;底板,设有锯片通孔用于使得所述锯片从中穿过;壳体,包括第一壳体和第二壳体;所述第一壳体具有第一端和第二端,所述第一端用于连接第二壳体,所述第二端用于连接电源装置;所述第二壳体收容所述电机与所述传动装置;所述壳体通过平行于所述输出轴的枢转轴线可转动地与所述底板连接,用于调节切割深度;电路板,收容在所述壳体内;其中,所述第一壳体还设有供用户抓握的把手部,当用户抓握所述把手部进行切割操作时,所述锯片位于所述第一壳体的左侧;并且当所述风扇转动时,所述电路板 与所述电机均布置在所述冷却气流的通路中。
一种可能的实施方式中,所述电路板布置在所述第一壳体的第一端内。
一种可能的实施方式中,所述风扇布置在所述电机轴的靠近所述锯片的一端;所述壳体上开设有冷却气孔,所述冷却气孔包括第一进风孔和第一出风孔;所述第一进风孔开设在所述第二壳体,位于所述第二壳体的与所述锯片相对的一侧;所述第一出风孔开设在所述第二壳体,位于所述风扇的径向外侧;所述风扇转动时,所述冷却气流包括从所述第一进风孔进入所述壳体,然后从所述第一出风孔流出所述壳体的第一冷却气流,所述第一冷却气流为所述电机散热。
一种可能的实施方式中,所述冷却气孔还包括第二进风孔,所述第二进风孔开设在所述第一壳体,位于所述电路板与所述锯片平面之间;所述壳体内部设置有第一筋板组件;在所述第一筋板组件引导下,当所述风扇转动时,所述冷却气流还包括从所述第二进风孔进入所述壳体,然后从所述第一出风孔流出所述壳体的第二冷却气流;所述第二冷却气流为所述电路板散热。
一种可能的实施方式中,所述冷却气孔还包括第二出风孔,所述第二出风孔开设在所述第一壳体,位于所述电路板与所述锯片平面之间;所述壳体内部设置有第二筋板组件;所述风扇转动时,在所述第二筋板组件引导下,所述冷却气流还包括从所述第一进风孔进入所述壳体,并从所述第二出风孔流出所述壳体的第二冷却气流;所述第二冷却气流依次流经所述电机,所述电路板。
一种可能的实施方式中,所述风扇布置在所述电机轴的远离所述锯片的一端;所述壳体上开设有冷却气孔,所述冷却气孔包括第一进风孔和第一出风孔;所述第一进风孔开设在所述第一壳体,位于所述电路板与所述锯片平面之间;所述第一出风孔开设在所述第二壳体,位于所述风扇的径向外侧;所述壳体内部还设有第二筋板组件;所述风扇转动时,在所述第二筋板组件的引导下,所述冷却气流包括形成在所述壳体内的第一冷却气流,所述第一冷却气流自所述第一进风孔进入所述壳体,依次流经所述电路板,所述电机,并最终自所述第一出风孔流出所述壳体。
一种可能的实施方式中,所述冷却气孔还包括第二进风孔,所述第二进风孔开设在所述第二壳体,且在沿平行于所述电机轴的方向上,所述第二进风孔位于所述电机与所述传动装置之间;所述风扇转动时,在所述第二筋板组件的引导下,所述冷却气流还包括形成在所述壳体的第二冷却气流;所述第二冷却气流自所述第二进风孔进入所述壳体,流经所述电机后,自所述第一出风孔流 出所述壳体。
一种可能的实施方式中,所述电路板设置在所述第一壳体的第二端,并且所述风扇布置在所述电机轴的靠近所述锯片的一端;所述冷却气孔包括第一进风孔、第一出风孔、以及第二出风孔;所述第一进风孔开设在所述第二壳体的,远离所述锯片的端部;所述第一出风孔开设在所述第二壳体,位于所述风扇的径向外侧;所述第二出风孔开设在所述第一壳体,靠近所述电路板设置。
一种可能的实施方式中,所述电路板布置在所述枢转轴线与所述把手部之间。
一种可能的实施方式中,所述把手部的径向周长的范围在130mm至150mm之间。
一种可能的实施方式中,所述第一壳体沿第一轴线延伸,并且所述第一轴线与所述电机轴的轴线垂直。
一种可能的实施方式中,所述传动装置采用一级传动,包括支承在所述电机轴上的主动齿轮以及支承在所述输出轴上的从动齿轮;所述一级传动的传动比范围在2-6.5之间,所述从动齿轮的齿数范围在12-35之间。
一种可能的实施方式中,当安装至所述输出轴的锯片直径在110-130mm时,所述切割工具的切割深度不小于38mm。
一种可能的实施方式中,所述底板上设有定深滑轨,所述定深滑轨对应的圆心位于所述枢转轴线上,并且所述定深滑轨与所述锯片分别位于所述第一壳体的两侧。
为解决上述技术问题,本发明的另一个技术方案是:一种切割工具,包括:输出轴,用于安装锯片;电机,用于驱动所述输出轴转动;所述电机为无刷电机,并具有电机轴;传动装置,设置在所述输出轴与所述电机轴之间,用于将所述电机的动力传递给所述输出轴,并且所述电机轴与输出轴平行;底板,设有锯片通孔用于使得所述锯片从中穿过;壳体,包括第一壳体和第二壳体;所述第一壳体具有第一端和第二端,所述第一端用于连接第二壳体,所述第二端用于连接电源装置;所述第二壳体收容所述电机与所述传动装置;其中,所述第一壳体还设有供用户抓握的把手部,当用户抓握所述把手部进行切割操作时,所述锯片位于所述第一壳体的左侧。
根据本发明提供的切割工具,其包括第一壳体和第二壳体,第一壳体具有用于连接第二壳体的第一端和用于连接电源装置的第二端;第二壳体内部收容 无刷电机和传动装置;并且风扇转动时,电机以及电路板均布置在冷却气流的通路中。通过布局的合理设置以及无刷电机的采用,本发明的切割工具取得了高效率和散热良好的技术效果。
下面结合附图和实施方式对本发明作进一步说明。
图1为本发明第一实施方式提供的切割工具的立体图;
图2为图1所示的切割工具的主视图,此时切割工具位于最大切深状态;
图3为图1所示的切割工具的后视图;
图4为图1所示的切割工具的俯视图;
图5为图1所示的切割工具的主视图,此时切割工具位于最小切深状态;
图6为图1所示的切割工具在切割工件时,其能被底板有效支撑的结构示意图,此时,活动护罩处于收折状态;
图7为图1所示的切割工具在静置时,其能被底板有效支撑的结构示意图,此时,锯片已被拆除且活动护罩处于收折状态;
图8为图1所示的切割工具在延伸底板后的主视图;
图9为图1所示的切割工具的右视图,主要部分以横截面示出,其中第一壳体已被拆除;
图10为图3所示的切割工具在拆除右半壳体后的结构图;
图11为图1所示的切割工具在另一视角下的立体结构图,此时,切割工具位于最小切深状态;
图12是用于描述第一实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
图13是用于描述第二实施方式的冷却气流的俯视图,其中其中主要部分以横截面示出;
图14是用于描述第三实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
图15是用于描述第四实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
图16为本发明第五实施方式提供的切割工具的后视图;
图17为图16所示的切割工具在拆除右半壳体后的结构图;
图18是用于描述第五实施方式的冷却气流的俯视图,其中主要部分以横截 面示出;
图19是用于描述第六实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
图20为本发明第七实施方式提供的切割工具的主视图;
图21为图20所示的切割工具的后视图;
图22是图21所示的切割工具在拆掉右半壳体后的结构图,其中电路板布置在第一壳体的第二端内;
图23是用于描述第七实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
图24是用于描述第八实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
图25是用于描述第九实施方式的冷却气流的俯视图,其中主要部分以横截面示出;
下面参照附图描述本发明的示例性实施方式。应当理解,这些具体的说明仅用于示教本领域技术人员如何实施本发明,而不用于穷举本发明的所有可行的方式,也不用于限制本发明的范围。
如图1至图12所示,本发明第一实施方式提供一种切割工具100,尤其是一种电圆锯,包括:用于安装锯片12的输出轴14;用于驱动输出轴14转动的电机,电机具有电机轴;设置在输出轴14与电机轴之间的传动装置,用于将电机的运动传递给输出轴14;壳体20,用于收容电机、传动装置等零件;护罩组件,附接到壳体20上,包括用于覆盖锯片12上半部分的固定护罩24以及可相对固定护罩24转动的活动护罩26;底板28,经由固定护罩24活动连接到壳体20上,其上形成有用于与工件接触的底板底面29。底板28具有锯片通孔22,锯片12能够穿过通孔22从底板底面29向下突出。
在本发明的描述中,除非另外指出,方向术语,如前、后、左、右、上和下等,都是相对于正常使用该切割工具100的方向,如定义切割工具100的前进方向为前,与切割工具100的前进方向相反的方向为后等。
如图1、4所示,壳体20包括第一壳体21和与第一壳体21连接的第二壳体23。
第一壳体21关于第一平面P对称设置。此处,定义锯片12所在的平面为锯片平面,该第一平面P与锯片平面平行。第一壳体21沿纵长方向延伸,具有分 别位于其延伸方向的第一端和第二端。此处,定义第一壳体21的延伸方向为第一轴线X方向。
第一壳体21的靠近输出轴14的第一端与第二壳体23连接;第一壳体21的远离输出轴14的第二端与电源装置30连接。电源装置30用于为切割工具100提供动力。具体的,第一壳体21的第二端设置有结合部210,结合部210用于连接电源装置30。
本实施方式中,电源装置30为电池包,结合部210用于可拆卸地连接电池包30。
第一壳体21的中部位置被构造成把手部211,方便用户在利用切割工具100进行切割操作时抓握。如图2所示,把手部211附近设置有安全开关32以及电源开关34。其中,电源开关34用于开启或关闭电机。并且,电源开关34只有在安全开关32被按下时方能被触发。也就是说,必须经过两次动作,电机才能被启动。由此,避免了单次操作带来的危险。在用户抓握把手部211时,用户的抓握把手部211的手能够触发安全开关32与电源开关34,以启动或关闭切割工具100。
第一壳体21的内部还设有电路板,电路板上安装有驱动电路和控制电路的一个或全部,其中驱动电路包括有开关元件,开关元件由电源开关34触发,用于切换提供给电机的电力;控制电路用于驱动前述驱动电路。
本实施方式中,第一壳体21由关于第一平面P对称的左半壳体212与右半壳体213通过螺钉组装而成。并且,左半壳体212通过螺钉与固定护罩24固定连接。
一种可能的实施方式中,第一壳体21也可以一体地形成。“一体地”尤其是应当理解为至少材料锁合地连接,例如通过焊接工艺、粘接工艺、注射工艺和/或技术人员认为有意义的其他工艺,和/或有利地理解为在一个块中成形,例如通过由一个铸件的铸造和/或通过以单组份或多组分注射成形方法并且优选为由一个单个的毛坯制造。
一种可能的实施方式中,第一壳体21与第二壳体23也可以一体地形成。
如图1、4所示,第二壳体23设置在第一壳体21的延伸方向的第一端,大致呈圆筒状,其内收容有电机和传动装置,并且电机轴的轴线与输出轴的轴线平行,且垂直于锯片平面。电机轴的轴线也垂直于第一壳体21的第一轴线X方向。
本实施方式中,第二壳体23由电机收纳部25以及减速箱27通过螺钉组装而成。其中,电机收纳部25内收容有电机16,减速箱27内收容有传动装置。在沿平行于电机轴的轴线方向上,固定护罩24、减速箱27、电机收纳部25依次排布, 三者通过螺钉固定连接。
请结合图1、2,护罩组件采用现有技术中的常规设计,其包括弧形结构的固定护罩24,以及相对固定护罩24转动的活动护罩26。其中,固定护罩24位于减速箱27的左侧。
本实施方式中,固定护罩24与减速箱27固定连接。活动护罩26套设在固定护罩24内,可围绕输出轴14的轴线转动以收折至固定护罩24内。输出轴14伸入至固定护罩24内,锯片12与输出轴14之间为可拆卸连接。在实际工作中,可根据被切割物的材质采用不同类型的锯片12。锯片12设置在固定护罩24内,其外圆周几乎上面一半被固定护罩24覆盖,活动护罩26在固定护罩24内转动以遮挡或漏出锯片12的下半部分。该活动护罩26与固定护罩24之间具有动护罩打开件25,请结合图1,在使用切割工具100时,操作者手动推动打开件25而使活动护罩26转动而露出部分锯齿。
底板28与固定护罩24活动连接。具体的,底板28的前侧上设置有连接座38,该连接座38与固定护罩24之间销连接,以使得该固定护罩24可相对底板28转动。此处,定义销所处的轴线为枢转轴线X1。枢转轴线X1与电机轴的轴线平行。当固定护罩24相对于底板28围绕枢转轴线X1转动时,固定护罩24与底板28之间的相对位置会发生变化,从而导致切割工具100具有不同的切割深度,如图2、图5所示。固定护罩24的转动为通过在把手部211上施加力,而使把手部211相对底板28转动,从而带动固定护罩24相对底板28转动。
这里,切割工具100的切割深度定义为:锯片12伸出底板底面29的距离。当把手部211带动固定护罩24转动至锯片12伸出底板底面29的距离最大时,切割工具100处于最大切割深度位置,此时的切割深度为最大切割深度,如图2所示。当把手部211带动固定护罩24转动至锯片12伸出底板底面29的距离最小时,切割工具100处于最小切割深度位置,此时的切割深度为最小切割深度,如图5所示。
切割工具100还包括定深调节机构和定深锁紧机构。定深调节机构包括设置在底板28和壳体20中的一个上的纵长延伸的定深滑轨31、设置在底板28和壳体20中的另一个上与定深滑轨31配接的定深滑动件33。定深滑轨31可以是弧形导轨,其导轨所在的圆弧对应的圆心位于枢转轴线X1上。当然,定深滑轨31的延伸方向也可以大致垂直于底面底板底面29,定深滑动件33在定深滑轨31内滑动即可调节锯片12伸出底面29的距离,从而调节锯片12的切 割深度。定深滑轨31的延伸方向大致垂直于底面29并不要求定深滑轨31沿直线延伸,只要具有大致垂直于底面29的纵长延伸方向即可。
定深锁紧机构可以使定深滑动件33相对滑轨31保持在某一特定的位置,从而使锯片12保持特定的距离伸出底面29,进而可以在工件上切出特定深度的槽。定深锁紧机构可以是螺纹锁紧机构、凸轮锁紧机构等常规结构,具体不再赘述。
本实施方式中,如图3所示,定深调节机构和定深锁紧机构设置在右半壳体213的一侧。其中,定深滑轨31固定设置在底板28上。在切割工具的切割行进方向上,定深滑轨31位于第一壳体21的右侧。定深滑动件33固定设置在第一壳体21上。
本实施方式中,第二壳体23分布在第一平面P的两侧,结合部210也关于第一平面P对称设置,从而有利于整个切割工具100的重心在沿垂直于第一平面P的方向更加靠近第一平面P设置,故整个切割工具100的重心能够更靠近把手部211的中间位置,使得用户在使用切割工具100时,稳定性更高,振动更小。
一种可能的实施方式中,第二壳体23也可以一体设置有上述减速箱27以及电机收纳部25。
此处,为了保证切割工具100在进行切割操作时的稳定性,避免用户在对切割工具100施以前进的作用力的同时,还需对切割工具100施以平行于电机轴方向的控制力,本发明的切割工具100的重心的投影落在底板28上。
结合图2和图4,于垂直于底板底面29的方向(图2中箭头a所指方向)上,切割工具100的重心的投影落在底板28上。
本实施方式中,底板28为矩形底板,其长度方向为切割工具100的切割行进方向(图2中箭头b所指方向),其宽度方向垂直切割工具100的切割行进方向。详细的,底板28包括沿切割工具100的切割行进方向延伸的长侧边281和垂直该长侧边281的短侧边282。长侧边281包括相对设置的左侧边和右侧边。短侧边282包括相对设置的前侧边和后侧边,该前侧边靠前设置,该后侧边靠后设置。当然,在其他实施例中,底板28可以为其他形状,如底板为圆形底板。
通过在垂直于底板底面29的方向上,将切割工具100的重心的投影设计成落在底板28上,以使切割工具100的重心偏前设置;从而当切割工具100在通过底板28被水平放置在工作台面上时,其能被底板28有效支撑。此时,用户 无须对切割工具100施以平行于电机轴方向的作用力,切割工具100也不会发生倾倒,提高用户体验感。需要说明的是,这里所说的切割工具100指的是:未连接有电池包30的切割工具100。
请结合图1至图4,常规的设计中,在切割工具100的整体重量中,收容有电机以及传动装置的第二壳体23占据的重量比例最大。所以,布置切割工具100的重心主要目的在于如何布置电机和减速装置。
本实施方式中,在垂直底板底面29的方向上,将减速箱27的投影设计成落在底板28上,电机容纳部25的投影设计成至少部分落在底板28上。如此设置,可以使切割工具100的重心的投影落在底板28上。
本实施方式中,切割工具100采用电池包30供电。而结合部210与电池包30的连接方式(包括电连接及机械连接)为现有技术中常用的连接手段,此处,不再对其详细描述。需要说明的是,当该切割工具100通过结合部210连接电池包30时,在垂直底板底面29的方向上,该切割工具100的重心的投影仍落在底板28上。
当然,在其他实施方式中,切割工具100也可采用其他方式供电,如通过在切割工具100上设置线缆插头以与市电电连接,或者通过适配器与市电电连接。
此处,当切割工具100不使用电池包30供电或者当切割工具100未安装电池包30时,在垂直于底板底面29的方向上,将切割工具100的重心的投影设计成落在底板28上,以使切割工具100的重心偏前设置,从而当切割工具100通过底板28水平放置在工作台面上时,不论切割工具100是在使用或静置,不论切割工具100位于何种切割深度,切割工具100均可被底板28有效支撑,平稳放置在工作台面上,不会发生倾倒的问题,提高用户体验感。
而当切割工具100使用电池包30供电时,同样的,在垂直于底板底面29的方向上,通过将切割工具100的重心的投影设计成落在底板28上,从而当切割工具100通过底板28水平放置在工作台面上时,不论切割工具100是在使用或静置,不论切割工具100处于何种切割深度,切割工具100均可被底板28有效支撑,平稳放置在工作台面上。
在切割工具100采用电池包30供电时,为了使得切割工具100能被底板28有效支撑,电池包30与第一壳体21的纵长延伸轴线X之间存在一定的位置关系。请结合图2,本实施方式中,电池包30与结合部210滑移连接,结合部 210定义了一移除轴线Y,结合部210包括位于移除轴线Y一端的第一部2101及位于移除轴线Y的另一端的第二部2102,该第二部2102相较于第一部2101更靠近输出轴14。即,结合部210的下端更靠近输出轴14。如此,当电池包30安装在结合部210上后,电池包30的重心更加靠前设置,从而有利于切割工具100的平衡。此处,结合部210所定义的移除轴线Y的方向即为电池包30的滑移方向。
请结合图2,第一壳体21的纵长延伸方向第一轴线X与电池包30的滑移方向Y所形成的夹角为β,β的角度范围在15°至90之间。并且,当β为90°时,电池包30的滑移方向Y与把手部211的延伸方向垂直时,电池包30的重心更加靠前,从而切割工具100的重心更加靠前,切割工具100的平稳性更好。
下面将结合附图6-7,说明切割工具100放置在工作台面B上时,通过将切割工具100的重心的投影设计成落在底板28上,底板28能够有效支撑切割工具100的情况。
一种可能的情况是,切割工具100在进行切割操作时,其能被底板28有效支撑。请结合图6,在切割时,底板28放置在工作台面B上,其底板底面29与工作台面B接触,该工作台面B可以是被切割物也可以是置于切割物上方的导向件,底板28的目的之一在于与工作面B接触以使切割稳定,另一目的在于使整机平稳,防止倾倒;
另一种可能的情况是,切割工具100被静置在底板28上时,其能被底板28有效支撑,不发生倾倒。此时,锯片12已被拆除,活动护罩26被收容于固定护罩24内。请结合图7,在未切割时,切割工具100上未安装锯片12,切割工具100通过底板28放置在工作台面B上,此时的工台作面B可为用于放置切割工具100的搁物架的置物面。此时,除自身重力以及工作面B对其的支持力外,切割工具100不受其他外力作用,切割工具100能被底板28有效的支撑,不发生倾倒。
上述实施方式中,底板28的尺寸为常规尺寸,切割工具100的重心通过合理布置收容有传动装置以及电机的第二壳体23而改变。
一种可能的实施方式中,可以通过增加底板28尺寸的方式将切割工具100有效的支撑。当然,底版28的尺寸也不是越大也好,也需基于操作感的考量,将底板28的尺寸设计在合理的范围内。
如图8所示,底板28’的虚线部分为相对现有的常规尺寸的底板28所增长的部分,底板28’的尺寸可以根据所使用的锯片12来进行选择。具体的,当装配直径为80-90mm范围的锯片12时,底板28’优选长度范围:150-220mm,可放大至280mm;而当装配直径为110-130mm范围的锯片12时,底板28’优选长度范围:190-245mm,可放大至300mm。
在实际使用中,切割工具100的底板28’为可拆卸结构,所以,当装配不同类型的锯片12时,可以选择更换不同尺寸底板28’。
本实施方式中,传动装置为单级传动,传动比范围在2-6.5之间。
如图9所示,传动装置包括支承在电机轴17上的主动齿轮38,以及支承在输出轴14上的从动齿轮40。其中,主动齿轮38与电机轴17同步运动,输出轴14与从动齿轮40同步运动。电机16转动时,主动齿轮38带动从动齿轮40转动,从而驱动安装在输出轴14上的锯片12转动以切割工件。
一种可能的实施方式中,电机轴17的末端一体设置有前述主动齿轮38;输出轴14上固定连接有从动齿轮40,诸如,从动齿轮40通过键连接的方式连接至输出轴14。
如前文所述,切割工具10的切割深度为锯片12伸出底板底面29的距离。也就是说,在切割工具10的切割过程中,只有穿过通孔22的那部分锯片12才能实现切割的功能。
请结合图9,当转动把手部211,使得锯片12伸出底板底面29的距离最大时,切割工具10处于最大切割深度位置,最大切割深度L可以表示为:L=R2-R1-L1-L2-L3,其中,R2表示锯片12的半径,R1表示从动齿轮40的齿顶圆半径,L1表示在沿垂直于底板底面29的方向上,减速箱27的外壁到底板底面29的距离;L2表示在沿垂直于底板底面29的方向上,减速箱27的壁厚;L3表示在沿垂直于底板底面29的方向上,从动齿轮40的最低点到减速箱27内壁的距离。
需要指出的是,不同规格的切割工具10,其所具有的L1、L2以及L3的尺寸差别很小。也就是说,真正能够影响切割工具10的最大切割深度的因素是锯片12的直径大小以及从动齿轮40的齿顶圆直径大小。
故,同一款切割工具10,其安装的锯片12的直径越大,其所具有的最大切割深度也就越大;安装相同锯片12的不同规格的切割工具10,其具有的从动齿轮40的齿顶圆的直径越小,其所具有的最大切割深度也就越大。
需要说明的是,此处我们所说的具有不同规格的切割工具10,均是指采用 了单级齿轮传动的切割工具10。
为了提高切割工具10的最大切割深度,提高其切割效率,我们在设计切割工具10的传动装置时,可以从从动齿轮40的齿顶圆尺寸入手,合理的选择相关的参数。
具体的,锯片12的转速会影响切割工具10的切割质量与切割效率。以切割工具10锯切木材时为例,锯片12的转速越高,锯切的质量就越高,锯切效率也越高。但因为锯片12的锯齿是通过焊接工艺连接至锯片本体上的,过高的转速可能会使得锯齿被甩离锯片本体;并且过高的转速也代表着一定的危险性。所以,需要选择合理的转速范围以带来良好的切割质量以及操作安全的双赢。本实施方式中,切割工具10的锯片12的转速在4500-6500rpm之间。而常规的应用于切割工具10,尤其是电圆锯的电机16的转速范围在10000-35000rpm之间,由此确定了切割工具10的传动比在2-6.5之间。
本实施方式中,传动比可以表示为电机16的转速与锯片12的转速之间的比值,也可以表示为单级传动的传动装置中,从动齿轮40与主动齿轮36的齿数比。而应用在切割工具10上的主动齿轮38的齿数,相对来说是固定的。诸如现有的电圆锯中,转动地支承在电机轴17上的主动齿轮38的齿数在5-8之间。由此,本实施方式中的从动齿轮40的齿数可以大致推算出来,从动齿轮的齿数在12-35之间。
我们知道,齿轮的齿顶圆直径d可以表示为:d=m*z。其中,m表示齿轮的模数,z表示齿轮的齿数。齿轮的模数与齿轮轮齿的强度以及齿轮的寿命正相关。即,齿轮的模数越大,齿轮轮齿的强度越高,齿轮啮合传动的寿命也就越长。但另一方面,随着齿轮的模数增大,齿轮的直径尺寸也增大,这不利于切割工具10的最大切割深度的提高。为此,需要兼顾齿轮的寿命以及切割工具的最大切割深度切深,合理选择齿轮的模数。
一种可能的实施方式中,电机16选用内转子电机,内转子电机的转速范围在20000-35000rpm之间。对应选用了内转子电机的切割工具100,其具有的传动比范围在3-6.5之间。优选的,传动比范围在4-5之间。
一种可能的实施方式中,电机16选用外转子电机,外转子电机的转速范围在10000-15000rpm之间。对应选用了外转子电机的切割工具100,其具有的传动比范围在2-3之间。优选的,传动比范围在2-2.5之间。
由此,本实施方式的切割工具100,其具有的传动比范围在2-6.5之间,从 动齿轮40的齿数在12-35之间。当装配直径为110mm-130mm的锯片12时,该切割工具10的最大切深将大于38mm。
区别于传统切割工具中将电机16收容于把手部211的设计,本实施方式中,收容电机16的电机收纳部25与把手部211独立设置。如此,把手部211的尺寸可以不受电机16尺寸的限制,设计在一个合理的范围内,以实现良好的握持体验。与此同时,我们也可以根据实际的切割需求,选择功率较大的电机。
本实施方式中,把手部211的径向周长约为140mm,小于第一壳体21的第一端以及第二端的径向尺寸;电机则选用无刷电机。
相同结构尺寸下,无刷电机16具有比有刷电机更高的输出功率;但同时,无刷电机16本身所散发的热量也会增加;并且,用以控制电机16的电力供给的电路板所散发的热量也会增加。为此,切割工具100还设置有散热装置。
散热装置包括散热风扇42以及散热片44。其中,散热风扇42由电机轴17驱动,用以产生冷却气流;散热片44上形成有散热筋,用于引导冷却气流的流向。
散热风扇42固定安装在电机轴17上。电机16启动时,散热风扇42随之同步转动以产生冷却气流。
散热片44与电路板固定连接,利用热传导的原理将电路板所产生的热量传导至其自身,再经冷却气流冷却,从而为电路板散热。为了加强散热片44的散热效果,散热片44被设计成板状结构,以求与电路板之间最大的接触面积。
为了产生冷却气流,切割工具100上还需设置冷却气孔。本发明中,冷却气孔的设置位置必须使得冷却气流至少能够流经电路板以及电机16,从而能够对电路板以及电机16进行散热。也就是说,电路板以及电机16需设置在冷却气流的流通通路中。如此,当电机16启动,散热风扇42旋转时,外部空气能够经由冷却气孔流入切割工具100的内部,形成冷却气流;并且,在流往散热风扇42的过程中,冷却气流至少流经电路板和电机16,最后再经由冷却气孔流出。
请参阅图10-12,下面将对第一实施方式的切割工具100的散热方案进行说明。
本实施方式中,电路板36布置在第一壳体21的第一端,散热风扇42布置在电机轴17的靠近锯片12的一端。进一步的,定义经过电机轴且垂直于锯片平面的为基准平面,电路板36位于基准平面的靠近第二端的一侧,与基准平面不相交。
电机16启动时,为了产生能够为电机16以及电路板36散热的冷却气流,壳 体20上还设置有冷却气孔。冷却气孔连通壳体20的内、外部,包括:第一进风孔46,如图10所示;第二进风孔48,如图1所示;以及第一出风孔50,如图11所示。
具体的,第一进风孔46开设在第二壳体23的,与锯片12相对的端面上;即,第一进风孔46开设在第二壳体23的远离锯片12的端面上。第二进风孔48开设在左半壳体212,位于锯片平面与电路板36之间;第一出风孔50开设在第二壳体23,位于风扇42的径向外侧。
由于电路板36布置在风扇42的径向外侧,因此通过有效利用导风圈52内侧的由散热风扇42的旋转产生的负压,产生自第二进风孔48进入的流经电路板36的冷却气流。
壳体20内部还设有第一筋板组件,用于引导冷却气流在壳体20内部的流通。具体的,如图12所示,第一筋板组件主要包括设置在第二壳体23内的第一筋板35,冷却气流在第一筋板35与第二壳体23的内壁所限定的空间中流动。
如图3、12所示,在切割操作中,在底板底面29抵接待切割工件的状态下,电源开关34正常触发,电机16启动,锯片12旋转,从而切割待切割工件。与此同时,散热风扇42旋转形成负压,驱动外部空气进入切割工具100的内部,为其散热。
具体的,散热风扇42旋转后,在第一筋板组件的引导下,冷却气流包括第一冷却气流和第二冷却气流。其中,第一冷却气流自第一进风孔46进入壳体20内部,首先流经电机16,并自第一出风孔50流出壳体20;第二冷却气流自第二进风孔48进入壳体20,先后流经电路板36,电机16,并最终自第一出风孔50流出。
本实施方式中,在第一筋板组件的引导下,第二冷却气流首先流经电路板36和散热片44、为其散热;然后第二冷却气流被引导至第二壳体23的远离锯片12的端部,与经由第一进风孔46进入切割工具100的内部的第一冷却气流汇合,共同流过电机16的转子和定子所限定的空间,为电机16散热。故,本实施方式的切割工具100,能提供更多的气流为电机16散热,电机16的散热更为充分。
进一步的,如图10所示,散热片44包括若干片状筋。在将电路板36布置在壳体20中时,为了减小冷却气流的流动阻力,优化冷却效果,相邻片状筋所限定空间的延伸方向将顺着冷却气流的流动方向。
随着电路板36,散热风扇42的设置位置不同,本发明的切割工具的散热方 案也会发生变化。
如图13所示,本发明第二实施方式提供的切割工具100a与第一实施方式提供的切割工具100的结构基本相同,其不同之处在于:对气流起引导作用的筋板组件的设置不同。具体的,本实施方式的切割工具100a,壳体20内部形成有第二筋板组件。
本实施方式中,关于切割工具100a如何散热,冷却气孔的作用以及冷却气流的形成大致描述如下:
如图13所示,与第一实施方式相同,本实施方式中,散热风扇42设置在电机轴17的靠近锯片12的一端;电路板36设置在第一壳体21的第一端,位于前述基准平面的一侧。冷却气孔包括第一进风孔46a,第一出风孔50a以及第二出风孔52a。其中,第一进风孔46a设置在第二壳体23的与锯片12相对的端面上;第一出风孔50a设置在第二壳体23上,位于风扇42的径向外侧;第二出风孔52a开设在左半壳体212上,位于锯片平面与电路板36之间。
电机16启动时,散热风扇42旋转形成负压,驱动外部空气进入壳体20的内部。与第一实施方式类似,冷却气流包括自第一进风孔46a进入壳体20,自第一出风孔50a流出的第一冷却气流。第一冷却气流为电机16散热。
与第一实施方式不同的是,在第二筋板组件的引导下,当散热风扇42旋转时,冷却气流还包括自第一进风孔46a进入壳体20,并自第二出风孔52a流出壳体20的第二冷却气流。第二冷却气流首先流经电机16,为电机16散热,然后流经电路板36,为电路板36散热,并最终自第二出风孔52a流出。
如图14所示,本发明第三实施方式提供的切割工具100b与第一实施方式提供的切割工具100的结构基本相同,其不同之处在于:散热风扇42的安装位置有所不同。具体的,散热风扇42布置在电机轴17的远离锯片12的一端。
本实施方式中,关于切割工具100b如何散热,冷却气孔各自的作用以及冷却气流的形成大致描述如下:
如图14所示,本实施方式中,冷却气孔包括第一进风孔46b和第一出风孔50b。其中,第一进风孔46b开设在第二壳体23,并且在沿平行于电机轴17的方向上,第一进风孔46b位于电机16与传动装置之间。第一出风孔50b开设在左半壳体212,位于锯片平面与电路板36之间。
电机16启动时,散热风扇42旋转形成负压,驱动外部空气进入壳体20内部。在第一筋板组件的引导下,散热气流包括自第一进风孔46b进入壳体20内部,并 自第一出风孔50b流出壳体20的第一冷却气流。第一冷却气流首先流过电机16,为电机16散热;然后流经电路板36,为电路板36散热。
如图15所示,本发明第四实施方式提供的切割工具100c与第一实施方式提供的切割工具100的结构基本相同,其不同之处在于:散热风扇42以及筋板组件的设置有所不同。具体的,散热风扇42布置在电机轴17的远离锯片12的一端;并且壳体20内部形成有前述第二筋板组件。
本实施方式中,关于切割工具100c如何散热,冷却气孔各自的作用以及冷却气流的形成大致描述如下:
如图15所示,冷却气孔包括第一进风孔46c,第二进风孔48c以及第一出风孔50c。其中,第一进风孔46c开设在左半壳体212,位于锯片平面与电路板36之间;第二进风孔48c开设在第二壳体23,且在沿平行电机轴17的方向上,第二进风孔48c位于电机16与传动装置之间;第一出风孔50c开设在第二壳体23,位于散热风扇42的径向外侧。
电机16启动时,散热风扇42旋转,驱动外部空气进入壳体20的内部。冷却气流包括自第一进风孔46c进入壳体20内部,并自第一出风孔50c流出壳体20的第一冷却气流,以及自第二进风孔48c流入壳体20,并自第一出风孔50c流出壳体20的第二冷却气流。第一冷却气流先后流经电路板36,电机16,为其散热。
前述实施方式中,电路板36的位置是固定的。即,电路板36均布置在第一壳体21的第一端,位于基准平面的靠近第二端的一侧。
一种可能的实施方式中,电路板36也可以布置在壳体20的其他位置。如图16-19所示,电路板36可以设置第一壳体21的第一端,并穿过前述基准平面。即,电路板36与基准平面相交。
图16-18示出了本发明第五实施方式的切割工具100d。本实施方式中,电路板36布置在第一壳体21的第一端,穿过前述基准平面;并且,散热风扇42设置在电机轴17的靠近锯片12的一端,壳体20内部形成有前述第一筋板组件。
与第一实施方式类似,本实施方式中,冷却气孔包括第一进风孔46d,第二进风孔48d以及第一出风孔50d。其中,第一进风孔46d开设在第二壳体23的与锯片12相对的端面上;第二进风孔48d开设在左半壳体212上,位于锯片平面与电路板36之间;第一出风孔50d开设在第二壳体23,位于散热风扇42的径向外侧。
本实施方式中,关于切割工具100d如何散热,冷却气孔各自的作用以及冷却气流的形成大致描述如下:
电机16启动,散热风扇42旋转,驱动外部空气进入壳体20内部。在第一筋板组件的引导下,冷却气流包括第一冷却气流和第二冷却气流。其中,第一冷却气流自第一进风孔46d进入壳体20内部,在流经电机16后,自第一出风孔50d流出壳体20;第二冷却气流自第二进风孔48d进入壳体20内部,先后流经电路板36,电机16,并最终自第一出风孔50d流出。
如图19所示,本发明第六实施方式提供的切割工具100e与第五实施方式提供的切割工具100d的结构基本相同,其区别在于,散热风扇42以及筋板组件的设置有所不同。具体的,散热风扇42布置在电机轴17的远离锯片12的一端,壳体20内部形成有第二筋板组件。
为了能够形成冷却电路板36以及电机16的冷却气流,壳体20上开设有冷却气孔。冷却气孔包括第一进风孔46e,第二进风孔48e以及第一出风孔50e。其中,第一进风孔46e开设在左半壳体212上,位于锯片平面与电路板36之间;第二进风孔48e开设在第二壳体23,且在沿平行于电机轴17的方向上,第二进风孔48e位于电机16与传动装置之间;第一出风孔50e开设在第二壳体23,位于风扇42的径向外侧。
本实施方式中,关于切割工具100e如何散热,冷却气孔各自的作用以及冷却气流的形成大致描述如下:
电机16启动时,散热风扇42旋转,驱动外部空气进入壳体20内部。冷却气流包括自第一进风孔46e进入壳体20内部,并自第一出风孔50e流出壳体20的第一冷却气流,以及自第二进风孔48e流入壳体20内部,并自第一出风孔50e流出壳体20的第二冷却气流。
同样的,第一冷却气流首先经过电路板36,为电路板36散热,然后流经电机16,为电机16散热,并最终自第一出风孔50e流出。
一种可能的实施方式中,也可以将电路板36布置在第一壳体21的第二端,靠近电源装置30设置,如图20至25所示。
图20-23示出了本发明第七实施方式的切割工具100f。其中,电路板36设置在第一壳体21的第二端;并且,散热风扇42布置在电机轴17的靠近锯片12的一端。
冷却气孔包括第一进风孔46f,第一出风孔50f以及第二出风孔52f。其中,第一进风孔46f开设在第二壳体23的与锯片12相对的端部。具体的,第二壳体23的与锯片12相对的端面,以及外周面均开设有第一进风孔46f。第一出风孔50f 开设在第二壳体23,位于风扇42的径向外侧;第二出风孔52f开设在第一壳体21的第二端,靠近电路板36设置。
壳体20内还设置有第三筋板组件用于引导冷却气流在壳体20内的流动。
本实施方式中,关于切割工具100f如何散热,冷却气孔各自的作用以及冷却气流的形成大致描述如下:
电机16启动时,散热风扇42旋转,驱动外部空气进入壳体20的内部。在第三筋板组件的引导下,冷却气流包括自第一进风孔46f进入壳体20内部,并自第一吹风孔50f流出壳体20的第一冷却气流,以及自第一进风孔46f进入壳体20内部,并自第二出风孔52f流出壳体20的第二冷却气流。第一冷却气流为电机16散热,第二冷却气流先后流经电机16以及电路板36,并为其散热。
如图24所示,本发明第八实施方式提供的切割工具100g与第七实施方式提供的切割工具100f的结构基本相同,区别之处在于:筋板组件的设置有所不同。具体的,壳体20内部形成有第四筋板组件。
与第七实施方式类似,散热风扇42布置在电机轴17的靠近锯片12的一端。但由于筋板组件的设置不同,冷却气孔的组成及其作用发生了变化。
具体的,如图24所示,冷却气孔包括第一进风孔46g,第二进风孔48g以及第一出风孔50g。其中,第一进风孔46g开设在第二壳体23的,远离锯片12的端部;第二进风孔48g开设在第一壳体21,靠近电路板36设置;第一出风孔50g开设在第二壳体23,位于散热风扇42的径向外侧。
电机16启动时,散热风扇42旋转,驱动外部空气进入壳体20的内部。在第四筋板组件的引导下,冷却气流包括自第一进风孔46g进入壳体20,并自第一出风孔50g流出壳体20的第一冷却气流,以及自第二进风孔48g进入壳体20,并自第一出风孔50g流出壳体20的第二冷却气流。第一冷却气流为电机16散热,第二冷却气流先后流经电路板36,电机16,并为其散热。
如图25所示,本发明第九实施方式提供的切割工具100h与第七实施方式提供的切割工具100f的结构基本相同,区别之处在于:散热风扇42的设置有所不同。
请参见图25,本实施方式中,散热风扇42设置在电机轴17的远离锯片12的一端。冷却气孔包括第一进风孔46h,第二进风孔48h以及第一出风孔50h。其中,第一风孔46h开设置第二壳体23,并且在沿平行于电机轴17的方向上,第一进风孔46h位于电机16与传动装置之间;第二进风孔48h开设在第一壳体21,靠近电 路板36布置;第一出风孔50h开设在第二壳体23的与锯片12相对的端部。具体的,第一出风孔50h开设在第二壳体23的端面以及圆周面上。
本实施方式中,关于切割工具100h如何散热,冷却气孔各自的作用以及冷却气流的形成大致描述如下:
电机16启动时,散热风扇42旋转,驱动外部空气进入壳体20的内部。在第三筋板组件的引导下,冷却气流包括自第一进风孔46h进入壳体20,并从第一出风孔50h流出壳体20的第一冷却气流,以及自第二进风孔48h进入壳体20,并从第一出风孔50h流出壳体20的第二冷却气流。第一冷却气流流经电机16,为电机16散热;第二冷却气流先后流经电路板36,电机16,为其散热。
一种可能的实施方式中,电路板36也可以设置在第二壳体23。大致结构请参考图10-12。此处,将收容电路板36的空间直接形成在第二壳体23上,第一壳体21自把手部沿第一轴线X延伸。通过冷却气孔的合理布置,在电机16驱动散热风扇42转动时,冷却气流也可以流经电路板36以及电机16,为其散热。
一种可能的实施方式中,电路板36设置在壳体20内,并位于枢转轴线X1与握持部211之间。
一种可能的实施方式中,电路板36可以独立于第一壳体21、第二壳体23设置。此处,通过冷却气孔的合理布置,在电机16驱动散热风扇42转动时,冷却气流也可以流经电路板36以及电机16,为其散热。
以上已经描述了本公开的实施方式,上述说明是示例性的,并非穷尽性的,并且也不限于所披露的各实施方式。在不偏离所说明的实施方式的范围和精神的情况下,对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择,旨在最好地解释各实施方式的原理、实际应用或对市场中的技术改进,或者使本技术领域的其它普通技术人员能理解本文披露的各实施方式。
Claims (15)
- 一种切割工具,包括:输出轴,用于安装锯片;电机,用于驱动所述输出轴转动;所述电机为无刷电机,并具有电机轴;风扇,由所述电机轴驱动,用于产生冷却气流;传动装置,设置在所述输出轴与所述电机轴之间,用于将所述电机的动力传递给所述输出轴,并且所述电机轴与输出轴平行;底板,设有锯片通孔用于使得所述锯片从中穿过;壳体,包括第一壳体和第二壳体;所述第一壳体具有第一端和第二端,所述第一端用于连接第二壳体,所述第二端用于连接电源装置;所述第二壳体收容所述电机与所述传动装置;所述壳体通过平行于所述输出轴的枢转轴线可转动地与所述底板连接,用于调节切割深度;电路板,收容在所述壳体内;其特征在于,所述第一壳体还设有供用户抓握的把手部,当用户抓握所述把手部进行切割操作时,所述锯片位于所述第一壳体的左侧;并且当所述风扇转动时,所述电路板与所述电机均布置在所述冷却气流的通路中。
- 如权利要求1所述的切割工具,其特征在于,所述电路板布置在所述第一壳体的第一端内。
- 如权利要求2所述的切割工具,其特征在于,所述风扇布置在所述电机轴的靠近所述锯片的一端;所述壳体上开设有冷却气孔,所述冷却气孔包括第一进风孔和第一出风孔;所述第一进风孔开设在所述第二壳体,位于所述第二壳体的与所述锯片相对的一侧;所述第一出风孔开设在所述第二壳体,位于所述风扇的径向外侧;所述风扇转动时,所述冷却气流包括从所述第一进风孔进入所述壳体,然后从所述第一出风孔流出所述壳体的第一冷却气流,所述第一冷却气流为所述电机散热。
- 如权利要求3所述的切割工具,其特征在于,所述冷却气孔还包括第二进风孔,所述第二进风孔开设在所述第一壳体,位于所述电路板与所述锯片平面之间;所述壳体内部设置有第一筋板组件;在所述第一筋板组件引导下,当所述风扇转动时,所述冷却气流还包括从所述第二进风孔进入所述壳体,然后从所述第一出风孔流出所述壳体的第二冷却气流;所述第二冷却气流为所述电路板散热。
- 如权利要求3所述的切割工具,其特征在于,所述冷却气孔还包括第二出风孔,所述第二出风孔开设在所述第一壳体,位于所述电路板与所述锯片平面之间;所述壳体内部设置有第二筋板组件;所述风扇转动时,在所述第二筋板组件引导下,所述冷却气流还包括从所述第一进风孔进入所述壳体,并从所述第二出风孔流出所述壳体的第二冷却气流;所述第二冷却气流依次流经所述电机,所述电路板。
- 如权利要求2所述的切割工具,其特征在于,所述风扇布置在所述电机轴的远离所述锯片的一端;所述壳体上开设有冷却气孔,所述冷却气孔包括第一进风孔和第一出风孔;所述第一进风孔开设在所述第一壳体,位于所述电路板与所述锯片平面之间;所述第一出风孔开设在所述第二壳体,位于所述风扇的径向外侧;所述壳体内部还设有第二筋板组件;所述风扇转动时,在所述第二筋板组件的引导下,所述冷却气流包括形成在所述壳体内的第一冷却气流,所述第一冷却气流自所述第一进风孔进入所述壳体,依次流经所述电路板,所述电机,并最终自所述第一出风孔流出所述壳体。
- 如权利要求6所述的切割工具,其特征在于,所述冷却气孔还包括第二进风孔,所述第二进风孔开设在所述第二壳体,且在沿平行于所述电机轴的方向上,所述第二进风孔位于所述电机与所述传动装置之间;所述风扇转动时,在所述第二筋板组件的引导下,所述冷却气流还包括形成在所述壳体的第二冷却气流;所述第二冷却气流自所述第二进风孔进入所述壳体,流经所述电机后,自所述第一出风孔流出所述壳体。
- 如权利要求1所述的切割工具,其特征在于,所述电路板设置在所述第一壳体的第二端,并且所述风扇布置在所述电机轴的靠近所述锯片的一端;所述冷却气孔包括第一进风孔、第一出风孔、以及第二出风孔;所述第一进风孔开设在所述第二壳体的,远离所述锯片的端部;所述第一出风孔开设在所述第二壳体,位于所述风扇的径向外侧;所述第二出风孔开设在所述第一壳体,靠近所述电路板设置。
- 如权利要求1所述的切割工具,其特征在于,所述电路板布置在所述枢转轴线与所述把手部之间。
- 如权利要求1所述的切割工具,其特征在于,所述把手部的径向周长的范围在130mm至150mm之间。
- 如权利要求1所述的切割工具,其特征在于,所述第一壳体沿第一轴 线延伸,并且所述第一轴线与所述电机轴的轴线垂直。
- 如权利要求1所述的切割工具,其特征在于,所述传动装置采用一级传动,包括支承在所述电机轴上的主动齿轮以及支承在所述输出轴上的从动齿轮;所述一级传动的传动比范围在2-6.5之间,所述从动齿轮的齿数范围在12-35之间。
- 如权利要求12所述的切割工具,其特征在于,当安装至所述输出轴的锯片直径在110-130mm时,所述切割工具的切割深度不小于38mm。
- 如权利要求1所述的切割工具,其特征在于,所述底板上设有定深滑轨,所述定深滑轨对应的圆心位于所述枢转轴线上,并且所述定深滑轨与所述锯片分别位于所述第一壳体的两侧。
- 一种切割工具,包括:输出轴,用于安装锯片;电机,用于驱动所述输出轴转动;所述电机为无刷电机,并具有电机轴;传动装置,设置在所述输出轴与所述电机轴之间,用于将所述电机的动力传递给所述输出轴,并且所述电机轴与输出轴平行;底板,设有锯片通孔用于使得所述锯片从中穿过;壳体,包括第一壳体和第二壳体;所述第一壳体具有第一端和第二端,所述第一端用于连接第二壳体,所述第二端用于连接电源装置;所述第二壳体收容所述电机与所述传动装置;其特征在于,所述第一壳体还设有供用户抓握的把手部,当用户抓握所述把手部进行切割操作时,所述锯片位于所述第一壳体的左侧。
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US (1) | US20220297209A1 (zh) |
EP (1) | EP4070901A4 (zh) |
CN (3) | CN212704724U (zh) |
WO (1) | WO2021109603A1 (zh) |
Cited By (1)
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EP4302909A3 (en) * | 2022-06-13 | 2024-03-13 | Milwaukee Electric Tool Corporation | Cut-off saw with a splash guard |
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CN212704724U (zh) * | 2019-12-06 | 2021-03-16 | 苏州宝时得电动工具有限公司 | 切割工具 |
JP1710836S (ja) * | 2021-09-22 | 2022-03-25 | 携帯用電気カッター本体 | |
CN113733249B (zh) * | 2021-09-23 | 2023-02-28 | 江苏大艺科技股份有限公司 | 一种电动工具 |
EP4391314A1 (en) * | 2022-12-09 | 2024-06-26 | Milwaukee Electric Tool Corporation | Power tool motor rotor configurations |
CN117324679B (zh) * | 2023-10-18 | 2024-04-09 | 张家港飞腾复合新材料股份有限公司 | 一种防偏移铝复合板切割装置及其切割方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN213411880U (zh) | 2021-06-11 |
CN212704724U (zh) | 2021-03-16 |
EP4070901A1 (en) | 2022-10-12 |
CN112916953A (zh) | 2021-06-08 |
EP4070901A4 (en) | 2023-06-14 |
US20220297209A1 (en) | 2022-09-22 |
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