CN117620307A - Hand-held band saw - Google Patents

Abstract

The application discloses hand-held band saw includes: the shell component comprises a battery pack mounting part, wherein the battery pack mounting part is used for mounting a battery pack; the rotating wheel assembly is at least partially arranged in the shell assembly, and comprises a first rotating wheel and a second rotating wheel which are arranged basically symmetrically about a bisecting plane; the motor is arranged in the shell assembly and can drive one of the first rotating wheel and the second rotating wheel to rotate; a fan capable of generating at least one air flow in the housing assembly when the fan rotates; the control circuit board is arranged in the shell component; an air inlet and an air outlet are formed in the shell component, and when the fan rotates, air flow entering the shell component from the air inlet at least flows through the control circuit board and the motor. The application can provide a handheld band saw with good heat dissipation effect and simple heat dissipation structure.

Description

Hand-held band saw

Technical Field

The application relates to a hand-held electric tool, in particular to a hand-held band saw.

Background

Currently, hand-held band saws are quite widely used for cutting all workable metals, tubing, solids, etc., including stainless steel. Has strong heat resistance, abrasion resistance and shock resistance, and has longer service life compared with similar products. Because of the advantages of flexible and convenient use, the utility model has been widely applied to the occasions of cutting various bar materials, pipe materials and sectional materials in industry, families and the like.

The operation of motor is usually controlled through control circuit board to handheld band saw, and its during operation of handheld band saw, the temperature rise of motor and control circuit board is higher, thereby damages motor and control circuit board easily and influences the use of handheld band saw. Therefore, how to realize the effective heat dissipation of the hand-held band saw and simultaneously make the hand-held band saw compact in structure and size is a difficult problem to solve.

Disclosure of Invention

For solving the not enough of prior art, the aim at of this application provides a handheld band saw that radiating effect is good and heat radiation simple structure.

In order to achieve the above object, the present application adopts the following technical scheme: a hand-held band saw comprising: the shell component comprises a battery pack mounting part, wherein the battery pack mounting part is used for mounting a battery pack; the rotating wheel assembly is at least partially arranged in the shell assembly, and comprises a first rotating wheel and a second rotating wheel which are arranged basically symmetrically about a bisecting plane; the motor is arranged in the shell assembly and can drive one of the first rotating wheel and the second rotating wheel to rotate; a fan capable of generating at least one air flow in the housing assembly when the fan rotates; the control circuit board is arranged in the shell component; an air inlet and an air outlet are formed in the shell component, and when the fan rotates, air flow entering the shell component from the air inlet at least flows through the control circuit board and the motor.

Further, when the fan rotates, the air flow entering the shell assembly from the air inlet flows through the control circuit board and then flows through the motor.

Further, the control circuit board is positioned on one side of the bisecting plane close to the motor.

Further, the casing assembly comprises a main handle, the main handle is provided with an accommodating space, the control circuit board is arranged in the accommodating space, and the air inlet is formed in the main handle.

Further, the housing assembly includes a motor housing formed with an interior space for accommodating the motor, the interior space communicating with the accommodating space, the motor housing including a connection port from which an air flow enters the interior space.

Further, a drainage structure is arranged in the accommodating space and comprises a first guide part and a second guide part, and the first guide part and the second guide part are matched with the main handle so that air flows to the control circuit board and then flows to the connecting port.

Further, the air inlet is arranged at the rear end of the main handle, and the air outlet is arranged on the motor shell and is close to the fan.

Further, the housing assembly further includes a main handle, the control circuit board is disposed within the main handle, and the control circuit board is disposed proximate a rear end of the main handle.

Further, the motor and the battery pack mounting part are positioned at two sides of the bisecting plane; the hand-held band saw further comprises: and an auxiliary handle portion connected to the battery pack mounting portion.

Further, the housing assembly includes a main handle portion disposed substantially symmetrically about the handle center plane, the auxiliary handle portion being on the same side of the handle center plane as the motor.

The beneficial point of the application lies in: the application provides a handheld band saw with good heat dissipation effect and simple heat dissipation structure.

Drawings

FIG. 1 is a perspective view of a hand-held band saw of the present application;

FIG. 2 is a plan view of the hand-held band saw of FIG. 1;

FIG. 3 is a perspective view of the hand-held band saw of FIG. 1 from another perspective;

FIG. 4 is a perspective view of the hand-held band saw of FIG. 1 from another perspective;

FIG. 5 is a cross-sectional view of the hand-held band saw of FIG. 4 taken along the direction A-A;

FIG. 6 is a cross-sectional view of the hand-held band saw of FIG. 2 taken along the direction B-B;

FIG. 7 is a schematic view of a portion of the hand held band saw shown in FIG. 1;

FIG. 8 is a schematic view of a portion of the hand held band saw shown in FIG. 1;

FIG. 9 is a schematic illustration of the hand-held band saw guard housing of FIG. 1 shown open;

FIG. 10 is an exploded view of the locking assembly of the hand held band saw of FIG. 9;

FIG. 11 is an enlarged view of a portion of the hand-held band saw of FIG. 8;

fig. 12 is a perspective view of a stop in the locking assembly of fig. 9.

Detailed Description

A power tool, specifically a hand-held band saw 100, is shown in fig. 1. Which can drive the functional element 51, in particular a saw blade, such that the hand-held band saw 100 can drive the saw blade to cut all workable metals, tubing, solids, etc., including stainless steel.

For clarity of explanation of the technical solution of the present application, upper, lower, front, rear, left and right are defined as shown in fig. 1.

Referring to fig. 1 to 4, a power tool, specifically a hand-held band saw 100, is provided in an embodiment of the present invention, and the hand-held band saw 100 includes: a host 10 and an energy source 11, the host 10 comprising: the housing assembly 20, the power assembly 30, the rotating wheel assembly 40, the cutting assembly 50, the handle assembly 60, the switch assembly 62, the heat sink 70, and the shroud assembly 80. The energy source 11 may specifically be a direct current or an alternating current, and in this embodiment the energy source 11 is specifically a battery pack 12.

The housing assembly 20 is the main component that forms the outer shape of the hand band saw 100. The housing assembly 20 has a first space 21, the first space 21 for at least partially receiving various components within the hand-held band saw 100. Namely, the power assembly 30, the rotating wheel assembly 40, the cutting assembly 50, the switching assembly 62, and the heat sink 70 are at least partially disposed within the first space 21.

The power assembly 30 is for powering a hand-held band saw 100, the power tool comprising a motor 31, the motor 31 comprising a motor shaft 32 rotatable about a motor axis 101, the motor shaft 32 having a first distance D1 in a direction along the motor axis 101. In this embodiment, the extending direction of the motor axis 101 is substantially aligned with the up-down direction.

The rotating wheel assembly 40 is used to transmit power from the power assembly 30 to the cutting assembly 50. The rotating wheel assembly 40 includes a first rotating wheel 41 and a second rotating wheel 42, and the motor 31 is capable of driving the first rotating wheel 41 and/or the second rotating wheel 42 to move. In the present application, the motor 31 drives the first rotating wheel 41 to rotate about the first axis. The first rotating wheel 41 and the second rotating wheel 42 are arranged at intervals to form the cutting area 26, and the first rotating wheel 41 and the second rotating wheel 42 are arranged substantially symmetrically about a bisecting plane P1. The first axis is parallel or coincident with the motor axis 101.

In fact, the housing assembly 20 includes a main housing 22, a first rotating wheel housing 23, a second rotating wheel housing 24, and a motor housing 25. The first rotating wheel 41 and the second rotating wheel 42 are coupled to the main housing 22, the first rotating wheel housing 23 is formed with a first open space 231, the second rotating wheel housing 24 is formed with a second open space 241, the first rotating wheel 41 is substantially accommodated to the first open space 231, the second rotating wheel 42 is substantially accommodated to the second rotating wheel 42, that is, the first rotating wheel housing 23 substantially accommodates the first rotating wheel 41, and the second rotating wheel housing 24 substantially accommodates the second rotating wheel 42. The first rotary wheel housing 23, the second rotary housing and the motor housing 25 are fixedly connected with the main housing 22. The bisecting plane P1 is a virtual plane. The main housing 22, the first rotating wheel housing 23 and the motor housing 25 may be made of different materials, and the main housing 22 may be made of aluminum alloy. The cutting assembly 50 is adapted to output power, the cutting assembly 50 comprising a functional element 51, i.e. a saw blade. The functional element 51 is connected to the first rotating wheel 41 and the second rotating wheel 42, and the functional element 51 drives the second rotating wheel 42 to synchronously move along with the first rotating wheel 41. When the host 10 moves, the functional element 51 moves along with the first rotating wheel 41, and during the movement, the functional element 51 is at least partially located in the cutting area 26, and the functional element 51 located in the cutting area 26 approaches the workpiece to be cut, so that the workpiece is cut. The cutting assembly 50 further comprises two pairs of oppositely disposed guide assemblies 52, the guide assemblies 52 being symmetrically disposed about the median plane P1, the guide assemblies 52 being disposed adjacent the cutting zone 26, and the guide assemblies 52 being adapted to cut along a first cutting direction 103 by a portion of the saw blade located in the cutting zone 26.

The handle assembly 60 includes a main handle 61, the housing assembly 20 is connected or formed with the main handle 61, the housing assembly 20 includes the main handle 61, the main handle 61 includes a handle portion 611 for gripping by a user, and the handle portion 611 is disposed substantially symmetrically about the handle center plane P2. The handle bisecting plane P2 is a virtual plane. The main handle 61 includes a first handle housing portion 612 and a second handle housing portion 613, and a hollow accommodating space 65 is formed between the first handle housing portion 612 and the second handle housing portion 613. The main handle 61 is in this application part of the housing assembly 20.

The switch assembly 62 is used for controlling the starting and the stopping of the motor 31, the switch assembly 62 is coupled with the control circuit board 64, and the control circuit board 64 is used for connecting the switch assembly 62 and the motor 31. The switch assembly 62 is mounted on the handle portion 611, i.e. the switch assembly 62 and the control circuit board 64 are at least partially disposed in the receiving space 65, such that a user can relatively conveniently trigger the switch assembly 62 when holding the handle portion 611.

As shown in fig. 1 to 4, the case assembly 20 is connected or formed with a battery pack mounting portion 27 for mounting the battery pack 12. The battery pack mounting portion 27 is disposed adjacent to the main handle 61, and when the battery pack 12 is mounted to the battery pack 12 mount, the handle bisecting plane P2 passes through the battery pack 12. The battery pack attachment portions 27 and the motor 31 are provided on both sides of the bisecting plane P1 in the left-right direction. The battery pack 12 and the motor 31 are relatively heavy parts relative to other parts of the hand-held band saw 100, and the battery pack 12 and the motor 31 are respectively arranged at two ends of the hand-held band saw 100, so that when the battery pack 12 is mounted on the host 10, the whole weight of the hand-held band saw 100 can be relatively balanced, the hand-held band saw 100 cannot be heavier, the whole body is deflected to one side when being held and cut, and the operation of a user is facilitated.

The heat sink 70 is used to dissipate heat from the motor 31. The heat dissipation device 70 includes a fan 71, wherein the fan 71 can be driven by the motor shaft 32 to rotate, and when the fan 71 rotates, at least one air flow is formed, the air flow enters the interior of the housing assembly 20 from the air inlet and flows out from the air outlet, and at least passes through the motor 31 and the control circuit board 64 on the flow path of the air flow, so as to dissipate heat of the control circuit board 64 and the motor 31.

As one implementation mode, a plurality of air inlets are formed on the shell component, one air flow is formed from the air inlets into the shell component, namely at least 2 air flows are formed when the fan rotates, one air flow flows through the motor for radiating heat of the motor, the other air flow flows through the control circuit board for radiating heat of the control circuit board, and finally the two air flows are combined and flow out of the air outlets. Of course, the air may flow out from the plurality of air outlets.

As another implementation mode, a plurality of air inlets are formed on the shell component, one air flow is formed in the shell component from the air inlets, namely at least 2 air flows are formed when the fan rotates, one air flow flows through the motor and is used for radiating heat of the motor, the other air flow flows through the control circuit board and the motor and is used for radiating heat of the control circuit board and the motor, and finally the two air flows are combined and flow out of the air outlets. Of course, the air may flow out from the plurality of air outlets.

As other embodiments, one or more air inlets are formed on the housing assembly, and an air flow is formed from the air inlets into the housing assembly, that is, at least one air flow is formed when the fan rotates, and the one or more air flows flow through the motor and the control current board, and finally flows out from the air outlet. This embodiment is described in detail below.

When the fan 71 rotates, an air flow a is formed, and the air flow a enters the interior of the housing assembly 20 from the air inlet 72 and flows out from the air outlet 73. On the way that the air flow a flows, at least passes through the motor 31 and the control circuit board 64, thereby dissipating heat from the control circuit board 64 and the motor 31.

When the fan 71 rotates, the air enters the housing assembly 20 from the air inlet 72, passes through the control circuit board 64 on the flow path of the air flow a, flows to the motor 31, and finally flows out from the air outlet 73. When the hand-held band saw 100 is in operation, the motor 31 rotates at a high speed, and a large amount of heat is generated by the motor 31, namely, the heat generated by the motor 31 is higher than the heat generated by the control circuit board 64, that is, the temperature of the air flow A flowing through the motor 31 is higher than the temperature of the air flow A flowing through the control circuit board 64, and the air flow A dissipates heat to the control circuit board 64 and the motor 31 better through the arrangement, so that the normal operation of the hand-held band saw is ensured.

The air flow a inlet is provided on the main handle 61 and the air flow a outlet is provided on the motor housing 25. The fan 71 may be a centrifugal fan 71, and when the fan 71 rotates, the centrifugal fan 71 generates negative pressure to suck the air flow a into the accommodating space 65 of the main handle 61 from the air flow a inlet, and then flows into the inner space 251 of the motor housing 25, and finally is discharged from the air outlet 73 of the motor housing 25, thereby forming heat dissipation to the motor 31 and the control circuit board 64, and prolonging the life of the motor 31 and the control circuit board 64.

The control circuit board 64 is disposed in the accommodation space 65, specifically, the control circuit board 64 is located on the side of the bisecting plane P1 near the motor 31, that is, the control circuit board 64 is disposed on the left side of the bisecting plane P1 in the left-right direction, the motor 31 is disposed on the left side of the bisecting plane P1, and the battery pack mounting portion 27 is disposed on the right side of the bisecting plane P1. I.e. the control circuit board 64 is arranged adjacent to the motor 31. The accommodation space 65 in which the control circuit board 64 is provided communicates with the inner space 251 in which the motor 31 is provided, forming a flow passage of the air flow a. The motor housing 25 is formed with a connection port 252, and the air flow a entering the accommodation space 65 directly enters the inner space 251 from the connection port 252. The motor housing 25 includes a first motor housing 253 and a second motor housing 254, both the first motor housing 253 and the second motor housing 254 are fixedly connected with the main housing 22, and the first motor housing 253 and the second motor housing 254 are combined to form a connection port 252 communicating with the accommodation space 65. The connection port 252 is at least partially located within the accommodation space 65. The first handle housing portion 612 is formed with a through hole through which the motor housing 25 at least partially extends into the accommodating space 65, the through hole being in communication with the connection port 252. Of course, the interior space 251 and the accommodation space 65 may also be in communication, i.e. indirectly, via a third party through space. A control circuit board 64 is provided at the rear end of the main handle 61, adjacent to the motor 31. In order to achieve the above-mentioned heat dissipation path a, the air inlet 72 is disposed adjacent to the control circuit board 64, or the control circuit board 64 and the motor 31 are disposed between the air inlet 72 and the air outlet 73. If the control circuit board 64 is disposed on the right side of the bisecting plane P1, not only is the control circuit board 64 required to be spatially disposed, but also the host computer needs to leave enough space for disposing the heat dissipation channel, and in order to make the structure of the host computer reasonable, the heat dissipation channel is disposed to be narrow and long under this condition, so that the heat dissipation effect of the host computer is poor. The air intake 72 is provided at the rear end of the main handle 61. The air inlet 72 and the air outlet 73 are adjacently arranged, that is, the distance between the heat dissipation channels between the air inlet 72 and the air outlet 73 is relatively short, so that the air duct between the air inlet 72 and the air outlet 73 can be arranged relatively widely, and the heat dissipation is convenient to fully dissipate.

In the direction extending along the motor axis 101, the fan 71 is disposed at the upper end of the motor 31, and the connection port 252 is disposed at least 90% at the lower end of the motor 31, so that the air flow a entering through the connection port 252 can sufficiently flow through the motor 31 and be discharged from the air outlet 73.

As shown in fig. 5, 8 and 11, a control circuit board 64 is provided in the rear end of the main handle 61, and a specific control circuit board is provided in the accommodation space 65 in an inclined manner. The heat sink 70 further includes a drainage structure 74, wherein the drainage structure 74 is fixedly disposed in the accommodating space 65 and disposed between the air inlet 72 and the control circuit board 64. The control circuit board 64 is obliquely disposed in the accommodation space 65, and the control circuit board 64 forms a space with the rear end of the main handle 61, and the drainage structure 74 is disposed in the space. The flow directing structure 74 is used to direct the airflow a toward the control circuit board 64. The drainage structure 74 is at least partially disposed between the air intake 72 and the connection port 252. The drainage structure 74 includes: a first guide 741 and a second guide 742. The first guiding portion 741, the second guiding portion 742 are connected to the first handle housing portion 612 and the second handle housing portion 613, the first guiding portion 741 is partially connected to the second guiding portion 742, and the first guiding portion 741, the second guiding portion 742, the first handle housing portion 612 and the second handle housing portion 613 are connected to form a stop structure for limiting the air flow a from entering from the air inlet 72 and directly entering the inner space 251. The first guide 741 extends substantially along the first direction 102, wherein the first direction 102 obliquely intersects the motor axis 101. The air flow a entering from the air inlet 72 is guided by the first guiding portion 741 to flow upward in the first direction 102, that is, the air flow a is guided to flow sufficiently to the control circuit board 64, so as to sufficiently dissipate heat.

The shroud assembly 80 is coupled to the housing assembly 20 for substantially covering the first rotating wheel 41 and the second rotating wheel 42. The shroud assembly 80 is movably coupled to the housing assembly 20 such that the shroud assembly 80 has at least a first state and a second state during movement of the shroud assembly 80, and such that when the shroud assembly 80 is in the first state, the shroud assembly 80 is relatively fixed to the housing assembly 20 and is capable of substantially covering the rotatable wheel assembly 40, which may also be understood as the shroud assembly 80 being locked relative to the housing assembly 20. When the shroud assembly 80 is in the second state, the shroud assembly 80 is relatively movable with respect to the housing assembly 20, which may also be understood as the shroud assembly 80 being in a released state with respect to the housing assembly 20.

The hand band saw 100 further includes a locking device 81, the locking device 81 being movably coupled to the housing assembly 20, the locking device 81 being configured to lock and unlock the shroud assembly 80 to transition the shroud assembly 80 between the first and second states. The locking means 81 comprises at least one set of locking assemblies 82.

The lock assembly 82 includes a driver 821, a stopper 822, a biasing member 823, and an abutment 824. The driver 821 has a retainable open position and a closed position. The drive member 821 is user-actuatable to drive the drive member 821 to an open position or a closed position, and when the drive member 821 is in the open position, the guard assembly 80 is in a second state, at which point the user can open the guard assembly 80, replace a saw blade, or clean debris, etc. When the driving member 821 is in the closed position, the cover assembly 80 may be in the first state or may still be in the second state, and when the cover assembly 80 is in the first state, the cover assembly 80 and the housing assembly 20 remain relatively fixed, and at this time, the user may start the motor 31 to perform cutting. When the drive assembly is in the closed position and the sheath assembly 80 is in the second state, the sheath assembly 80 will always be in the active state. The stop 822 cooperates with the driver 821 so that the driver 821 can be maintained in either the open or closed position. The biasing member 823 always provides a driving force to the driving member 821 so that the driving member 821 is always kept at the current position without external force driving. The abutting piece 824 abuts against the driving piece 821. In this way, the user can open or close the locking assembly 82 only by driving the driving member 821, so as to lock or release the cover assembly 80, and the driving member 821 is always at the current position under the condition of external force driving, that is, the user can release or lock the cover assembly 80 by only one step when operating the driving member 821, thereby facilitating the operation of the user.

As shown in fig. 9, 10 and 12, the stopper 822 is fixedly connected to the main housing 22, and in this embodiment, the stopper 822 is fixedly connected to the main housing 22 by a screw. The stopper 822 is formed with a sliding groove 825 and a movable space 826. The sliding groove 825 protrudes out of the movable space 826, that is, the sliding groove 825 is at least partially disposed outside the movable space 826, the biasing member 823 is at least partially disposed in the movable space 826, one end of the biasing member 823 abuts against the main housing 22, the other end abuts against the abutting member 824, when the abutting member 824 is forced to move toward the main housing 22, the biasing member 823 is forced to compress in the movable space 826, when the external force applied to the abutting member 824 is eliminated, the biasing member 823 rebounds, and the other end of the biasing member 823 continues to abut against the abutting member 824. The abutment member 824 is at least partially disposed in the movable space 826, and one end of the abutment member 824 abuts against the biasing member 823 and the other end abuts against the driving member 821, and it is understood that the driving force of the biasing member 823 is transmitted to the driving member 821 through the abutment member 824. The moving member portion is disposed within the slide groove 825, and the driving member 821 is movable with respect to the slide groove 825.

The driver 821 cooperates with the stop 822 to switch between an open position and a closed position in which the driver 821 is retainable, the driver 821 including a first contact surface 827 and a second contact surface 828, the first and second contact surfaces 827, 828 not being in a plane, the first contact surface 827 being in contact with the abutment 824 when the driver 821 is in the open position and the second contact surface 828 being in contact with the abutment 824 when the driver 821 is in the closed position. Specifically, the driving member 821 is capable of rotating relative to the stopper 822, the driving member 821 is formed with two cylindrical connection portions 829 protruding outward, the two connection portions 829 are disposed in the sliding groove 825 of the stopper 822, and the driving force of the biasing member 823 makes the outer wall of the connection portion 829 always contact at least with the inner wall of the sliding groove 825.

The shroud assembly 80 includes at least one shroud housing 83, the shroud housing 83 being rotatably coupled to the main housing 22. In the present embodiment, the shroud assembly 80 includes a shroud housing 83, and the shroud housing 83 cooperates with the first and second rotating wheel housings 23, 24 to substantially enclose the first and second open spaces 231, 241. The shroud housing 83 includes a stop 831, the stop 831 being capable of mating with the drive 821. The stop 831 contacts the driving member 821 when the shroud assembly 80 is in the first state so that the shroud assembly 80 and the housing assembly 20 remain substantially fixed relative to each other, and the stop 831 does not contact the driving member 821 when the shroud assembly 80 is in the second state, such that the shroud housing 83 is rotatable relative to the main housing 22. As other embodiments, the shield housing may be separate from the main housing, i.e., the shield housing may be separate from the main housing when the shield assembly is in the second state, i.e., the shield housing may be separate from the main housing as a single, separately located component. It will be appreciated that the user may remove the shield housing when the locking assembly is in the open position, or may continue cutting by placing the drive member in the open position and then placing the shield housing alone when the user does not want to install the shield housing. Of course, when the user wants to use the shield shell, the user only needs to install the shield shell on the host machine and drive the driving piece to be in the closed position.

As another possible embodiment, the locking assembly 82 may not be provided with an abutment member 824, i.e. the biasing member 823 directly abuts the driving member 821, which can also achieve the above-mentioned function.

The locking assembly 82 is disposed near the cutting area 26, and the locking assembly 82 may be provided with a set of locking shield housing 83 and main housing 22, and of course, two sets of locking assemblies 82 may be provided, and in this embodiment, the two sets of locking assemblies 82 are disposed symmetrically about the bisecting plane P1 on both sides of the cutting area 26. When the driving members 821 of the two sets of locking assemblies 82 are both in the open position, the shield housing 83 can be opened and rotated relative to the main housing 22. It should be noted that the two sets of locking assemblies 82 are substantially identical in structure and are only disposed in different positions.

The first rotating wheel housing 23 is provided with an elongated chip discharge port 232, and the chip discharge port 232 is used to discharge excess chips carried by the saw blade during cutting by the saw blade when the main machine 10 is in operation. The exhaust port 232 is disposed on the first rotating wheel housing 23 in contact with the shield housing 83 and adjacent the cutting area 26. A plurality of exhaust ports 232 may be disposed on the first rotating wheel housing 23.

As shown in fig. 1, the handle assembly 60 further includes an auxiliary handle portion 66, the auxiliary handle portion 66 being for a user to grasp, and the user can grasp the handle portion 611 with one hand and the auxiliary handle portion 66 with the other hand while using the host computer 10. The arrangement is convenient for the user to hold. The auxiliary handle portion 66 is fixedly connected to the housing assembly 20, and further, the auxiliary handle portion 66 is disposed on both sides of the middle split plane P1 with respect to the motor 31 in the left-right direction, and the auxiliary handle portion 66 is disposed on the front side of the handle middle split plane P2 with respect to the motor 31 in the front-rear direction. It will be appreciated that the handle portion 611 is not in line with the auxiliary handle portion 66, and that the auxiliary handle portion 66 is fixedly connected to the battery pack mounting portion 27, specifically, the auxiliary handle portion 66 is connected to the battery pack mounting portion 27 by screws. That is, the auxiliary handle portion 66 is provided on the side surface of the battery pack mounting portion 27, so that the user can conveniently control the cutting direction of the hand-held band saw 100 and can conveniently operate the hand-held band saw 100 when using both hands to control the hand-held band saw 100.

The foregoing has outlined and described the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the present application in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the present application.

Claims (10)

1. A hand-held band saw comprising:

the shell component comprises a battery pack mounting part, wherein the battery pack mounting part is used for mounting a battery pack;

the rotating wheel assembly is at least partially arranged in the shell assembly, and comprises a first rotating wheel and a second rotating wheel which are arranged basically symmetrically about a bisecting plane;

the motor is arranged in the shell assembly and can drive one of the first rotating wheel and the second rotating wheel to rotate;

a fan capable of generating at least one air flow within said housing assembly when rotated;

the control circuit board is arranged in the shell component;

an air inlet and an air outlet are formed in the shell component, and when the fan rotates, air flow entering the shell component from the air inlet at least flows through the control circuit board and the motor.

2. The hand-held band saw of claim 1, wherein when the fan rotates, air flowing into the housing assembly from the air inlet flows through the motor after flowing through the control circuit board.

3. The hand-held band saw of claim 2, wherein the control circuit board is located on a side of the split face adjacent the motor.

4. The hand-held band saw of claim 3, wherein the housing assembly includes a main handle defining a receiving space, the control circuit board being disposed in the receiving space, the air inlet being disposed on the main handle.

5. The hand-held band saw of claim 4, wherein the housing assembly includes a motor housing defining an interior space for receiving the motor, the interior space in communication with the receiving space, the motor housing including a connection port from which the air flow enters the interior space.

6. The hand-held band saw of claim 5, wherein a drainage structure is disposed in the receiving space, the drainage structure including a first guide portion and a second guide portion, the first guide portion and the second guide portion cooperating with the main handle to enable the airflow to flow to the control circuit board and then to the connection port.

7. The hand-held band saw of claim 4, wherein the air inlet is disposed at a rear end of the main handle and the air outlet is disposed on the motor housing proximate to the fan.

8. The hand-held band saw of claim 1, wherein the housing assembly further comprises a main handle, the control circuit board is disposed within the main handle, and the control circuit board is disposed proximate a rear end of the main handle.

9. The hand-held band saw of claim 1, wherein the motor and the battery pack mounting portion are located on either side of the split face;

the hand-held band saw further comprises: and an auxiliary handle portion connected to the battery pack mounting portion.

10. The hand-held band saw of claim 9, wherein the housing assembly includes a main handle portion disposed substantially symmetrically about a handle bisecting plane, the auxiliary handle portion being on the same side of the handle bisecting plane as the motor.