Power tool

Abstract

The present application relates to a kind of electric tools, including shell, the working assembly that the front end of shell extends forward, the motor for driving working assembly and the first grip and the second grip for user to hold, the first grip extends substantially along the first axis, and the second grip includes the first fixed part and the second fixed part connected with shell;Between the first fixed part and the second fixed part, the second axis is connected to form, from the left and right direction perpendicular to front and back direction, the first axis and the second axis intersect and the angle between the two is greater than or equal to 40 ° and less than or equal to 85 °, when user holds and operates electric tool with both hands, the angle between two hands is not too small to easily tired, also not too big so that the holding area of one hand is limited and affect use experience.

Description

Technical Field

[0001] This invention relates to a power tool, and more particularly to a power tool that is comfortable to operate and can expand the effective grip area. Background Technology

[0002] As a common type of garden power tool, a chainsaw consists of a housing, a motor housed within the housing, and a battery pack that powers the motor. To accommodate different working angles and user operating habits, chainsaws typically have a main handle on the top side of the housing and a side handle on one side of the housing. The side handle and the main handle form a certain angle. When this angle is too small, the distance between the user's two hands is too small, resulting in discomfort during operation. When this angle is too large, the user usually holds the handle in a small area where it is bent to save effort, making it unsuitable for multi-angle working scenarios.

[0003] Therefore, it is indeed necessary to provide an improved power tool to overcome the shortcomings of the existing technology. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a power tool that is comfortable to operate and can expand the effective grip area.

[0005] The present invention addresses the problems of the prior art by adopting the following technical solution: an electric tool, comprising a housing, a working component extending forward from the front end of the housing, a motor for driving the working component, and a first grip portion and a second grip portion for a user to hold. The first grip portion extends generally along a first axis, and the second grip portion includes a first fixing portion and a second fixing portion connected to the housing. The first fixing portion and the second fixing portion are connected to form a second axis. When viewed from a left-right direction perpendicular to the front-back direction, the first axis and the second axis intersect, and the angle formed between them is greater than or equal to 40° and less than or equal to 85°.

[0006] A further improvement is as follows: the first gripping part is located on the top side of the housing, the housing includes a first connecting area connected to the front end of the first gripping part and a second gripping area connected to the rear end of the first gripping part, the second gripping part is located on the side of the housing and the first fixing part is at least partially disposed in the first connecting area.

[0007] A further improvement is as follows: when viewed from the left and right direction, the intersection of the first axis and the second axis is located within the first connecting area, and the included angle between the first axis and the second axis is greater than or equal to 45° and less than or equal to 65°.

[0008] A further improvement is as follows: the power tool includes a functional component housed in the housing, the functional component including the motor, a gear assembly drivenly connected to the motor, and a gearbox for housing the gear assembly, the functional component having a contour area, and when viewed from the left and right direction, the second fixing part is at least partially located within the contour area.

[0009] A further improvement is as follows: the motor is provided with a motor shaft extending in the left-right direction, the gear assembly includes an output shaft arranged parallel to the motor shaft, and in the front-back direction, the center of the second fixing part is located between the motor shaft and the output shaft.

[0010] A further improvement is that the center of gravity of the power tool is located between the motor shaft and the output shaft in the front-to-back direction, and the center of gravity of the power tool is located between the first fixed part and the second fixed part in the up-down direction perpendicular to the front-to-back direction.

[0011] A further improvement is as follows: the working component includes a guide plate extending along the third axis, the motor shaft and the output shaft are connected to form a fourth axis, the angle between the fourth axis and the third axis is an acute angle, and the second fixing part is disposed on the lower front side of the motor shaft.

[0012] A further improvement is as follows: the second gripping part includes a first segment extending from the first fixing part, a second segment extending from the second fixing part, and a third segment connecting the first segment and the second segment. The second gripping part includes an effective gripping area located on at least one of the first segment and the third segment. The length of the effective gripping area decreases as the angle between the first axis and the second axis increases.

[0013] A further improvement is as follows: the working component includes a guide plate extending along a third axis, and the first fixing part and the second fixing part are located on both sides of the third axis in a vertical direction perpendicular to the front and back.

[0014] A further improvement is as follows: the first gripping part is located on the top side of the housing, and the included angle between the first axis and the third axis is between 0° and 15°.

[0015] Compared with the prior art, the present invention has the following beneficial effects: by setting the angle between the second axis formed by connecting the first fixing part and the second fixing part of the second grip and the first axis of the first grip between 40° and 85°, the angle between the two hands when the user holds and operates the power tool is not too small and easy to get tired, nor too large and the gripping area of ​​one hand is limited and affects the user experience. Attached Figure Description

[0016] Figure 1 A front view of a power tool according to a preferred embodiment of the present invention;

[0017] Figure 2 for Figure 1 Rear view of the power tool shown;

[0018] Figure 3 for Figure 1 The power tool shown is viewed from below.

[0019] Figure 4 for Figure 1 The diagram shows a power tool removing part of the housing;

[0020] Figure 5 for Figure 3 Partial cross-sectional view of the power tool shown;

[0021] Figure 6 for Figure 1 A schematic diagram of the motor and housing of the power tool shown;

[0022] Figure 7 This is a front view of a second embodiment of the second gripping part of the present invention;

[0023] Figure 8 This is a front view of a third embodiment of the second gripping part of the present invention.

[0024] Meaning of the reference numerals in the diagram:

[0025] Chainsaw 100, First Chamber 101

[0026] Second chamber 102 Third chamber 103

[0027] Effective gripping area Z housing 10

[0028] Main body 11 Battery mounting section 12

[0029] First connection region 13 Second connection region 14

[0030] First casing 15, air inlet 151

[0031] Second housing 16, air outlet 161

[0032] Working component 20 Guide plate 21

[0033] Functional component 30 Motor 31

[0034] Motor shaft 311 Controller 32

[0035] Gear assembly 33, output shaft 331

[0036] Gearbox 34, Contour Area 35

[0037] Fan 36 First grip section 40

[0038] Second gripping part 50 First fixing part 51

[0039] Second fixing part 52 First section 53

[0040] Paragraph 2, 54; Paragraph 3, 55

[0041] Separating device 60 Separating plate 61

[0042] Shield 62, Guide Wall 621

[0043] Horizontal connecting wall 622, flow guide 623

[0044] First axis X1 Second axis X2

[0045] Third axis X3 Fourth axis X4 Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0047] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0048] Please refer to Figures 1 to 4 As shown, the present invention relates to a power tool, with a chainsaw 100 as a preferred embodiment. The chainsaw 100 includes a housing 10 extending generally in a front-rear direction, a working component 20 extending forward from the front end of the housing 10, a functional component 30 at least partially housed in the housing 10, and a battery pack (not shown) detachably connected to the rear end of the housing 10.

[0049] The working component 20 includes a guide plate 21 detachably connected to the front end of the housing 10 and a chain (not shown) fixed to the outer periphery of the guide plate 21. The functional component 30 includes a motor 31 for driving the working component 20, a controller 32 electrically connected to the motor 31, a gear assembly 33 drively connected to the motor 31, and a gearbox 34 for housing the gear assembly 33. The battery pack supplies power to the motor 31 to drive the chain to rotate around the outer periphery of the guide plate 21, thereby realizing the cutting operation.

[0050] The motor 31 is an external rotor motor, which includes a motor shaft 311 extending in a left-right direction perpendicular to the front-back direction, a stator and a rotor connected to the motor shaft 311. The gear assembly 33 includes an output shaft 331 arranged parallel to the motor shaft 311, a large gear connected to one end of the output shaft 331 and a small gear connected to one end of the motor shaft 311, the small gear meshing with the large gear to transmit power.

[0051] The housing 10 includes a body portion 11 for accommodating the functional component 30 and a battery pack mounting portion 12 located at the rear end of the body portion 11. The battery pack mounting portion 12 extends obliquely to fix the battery pack obliquely to the rear end of the housing 10. The chainsaw 100 includes a first grip portion 40 and a second grip portion 50 for the user to hold. The first grip portion 40 is located on the top side of the housing 10 and is spaced apart from the body portion 11 by a certain gripping area. The housing 10 includes a first connecting area 13 connected to the front end of the first grip portion 40 and a second connecting area 14 connected to the rear end of the first grip portion 40. The first connecting area 13 is larger in the vertical direction than the second connecting area 14 in the vertical direction, so that the first grip portion 40 extends obliquely along the first axis X1. The guide plate 21 of the working component 20 extends along the third axis X3. The first axis X1 of the first grip portion 40 and the third axis X3 of the guide plate 21 form an angle of 0-15°. The obliquely set first grip portion 40 is more convenient for the user to hold.

[0052] The second grip portion 50 is located on the side of the housing 10 and includes a first fixing portion 51 and a second fixing portion 52 connected to the housing 10, a first segment 53 extending laterally from the first fixing portion 51, a second segment 54 extending laterally from the second fixing portion 52, and a third segment 55 connecting the first segment 53 and the second segment 54. The first fixing portion 51 is at least partially located within the first connecting region 13, and the second fixing portion 52 is located between the first connecting region 13 and the second connecting region 14 in the front-rear direction.

[0053] Specifically, the first fixing part 51 and the second fixing part 52 are connected to form a second axis X2, and the intersection of the first axis X1 and the second axis X2 is located within the first connecting area 13. Viewed from the left-right direction perpendicular to the front-back direction, the first axis X1 and the second axis X2 intersect, and the angle A1 formed between them is greater than or equal to 40° and less than or equal to 85°. This arrangement ensures that when the user operates the chainsaw 100, the distance between the right hand holding the first grip part 40 and the left hand holding the second grip part 50 is neither too large nor too small, resulting in a comfortable grip.

[0054] When using the chainsaw 100 for cutting, the user holds the chainsaw 100 with both hands on the grip area. To adapt to different working angles or scenarios, the user subconsciously chooses a more comfortable grip area. This subconsciously chosen grip area is called the effective grip area Z. After multiple tests, the angle between the first axis X1 and the second axis X2, the position of the second fixing part 52 fixed to the housing 10, and the position of the machine's center of gravity G are the influencing factors on the size of the effective grip area Z. The length of the effective grip area Z decreases as the angle between the first axis X1 and the second axis X2 increases.

[0055] The following will combine Figures 1 to 8 Examples are given when the second fixing part 52 is in several different positions:

[0056] like Figures 1 to 5 As shown, the functional component 30 has a contour region 35, which is formed by the outer contours of the gearbox 34 and the motor 31. When viewed from the left and right direction, the second fixing part 52 is at least partially located within the contour region 35. At this time, the angle between the first axis X1 and the second axis X2 is between 40° and 75° (including the endpoints), and the center of gravity G of the entire chainsaw 100 is located within the area surrounded by this angle range. In the vertical direction, the center of gravity G of the entire machine is located between the first fixing part 51 and the second fixing part 52. When the angle between the first axis X1 and the second axis X2 is 40°, the effective grip area Z includes the lateral grip area of ​​the first segment 53, the bent grip area between the first segment 53 and the third segment 55, and the lateral grip area of ​​the third segment 55 located above the center of gravity G. Users can choose a specific position to grip within this effective grip area Z according to different work scenarios. The user's palm is naturally facing down or tilted up at a certain angle, which is a relatively comfortable grip state, and the angle between the left and right hands is not too small to affect the operation experience. When the angle between the first axis X1 and the second axis X2 is 75°, the effective grip area Z includes the lateral grip area of ​​the first segment 53, the bent grip area between the first segment 53 and the third segment 55, and a small part of the lateral grip area of ​​the third segment 55 near the bent grip area. At this time, if the user grips the third segment 55, the left palm has a certain upward tilt angle, and the grip comfort is significantly lower than that of the above embodiment.

[0057] More optimized solutions, such as Figure 1 and Figure 4As shown, the connection between the motor shaft 311 and the output shaft 331 forms a fourth axis X4. The angle between the third axis X3 and the fourth axis X4 is an acute angle. The second fixing part 52 is located on the lower front side of the motor shaft 311. Specifically, the center of the second fixing part 52 is located between the motor shaft 311 and the output shaft 331 in the front-rear direction. At this time, the angle between the first axis X1 and the second axis X2 is between 50° and 60° (including the endpoint). The effective grip area Z includes the lateral grip area of ​​the first segment 53, the bending grip area between the first segment 53 and the third segment 55, and the lateral grip area of ​​the third segment 55 located above the center of gravity G. Users can choose a specific position to grip within the effective grip area Z according to different work scenarios. The user's palm is naturally downward or tilted upward at a certain angle, which is a relatively comfortable grip state, and the angle between the left and right hands is not too small to affect the operation experience.

[0058] like Figure 7 As shown, the second fixing part 52 is located directly below the first fixing part 51. At this time, the angle A2 between the first axis X1 and the second axis X2 is 85°. The effective grip area Z includes the lateral grip area of ​​the first segment 53 and the bent grip area between the first segment 53 and the third segment 55. Within this effective grip area Z, the user's palm naturally points downward, resulting in good grip comfort. If the second fixing part 52 is moved further forward, the effective grip area will only be part of the first segment 53 when the user grips it. When gripping other parts, the palm will tilt downward and the wrist will be bent upward. Prolonged operation can easily lead to wrist pain and a poor user experience.

[0059] like Figure 8 As shown, the second fixing part 52 is at least partially located within the outline region 35 of the motor 31 in the front-rear direction. When the center of the second fixing part 52 is flush with the rear end edge of the motor 31 in the front-rear direction, the angle A3 between the first axis X1 and the second axis X2 is 45°. At this time, when viewed from the left-right direction, the center of gravity G of the chainsaw 100 is approximately coincident with the third segment 55 of the second gripping part 50. The effective gripping area Z includes the lateral gripping area of ​​the first segment 53, the bending gripping area between the first segment 53 and the third segment 55, and the lateral gripping area of ​​the third segment 55 located above the center of gravity G.

[0060] By setting the angle between the second axis X2 formed by connecting the first fixing part 51 and the second fixing part 52 of the second grip 50 and the first axis X1 of the first grip 40 between 40° and 85°, the angle between the two hands when the user operates the power tool is not too small and easy to get tired, nor too large and the gripping area of ​​one hand is limited and affects the user experience.

[0061] The chainsaw 100 also includes a tensioning device disposed on the opposite side of the housing 10 relative to the second grip 50, the tensioning device being used to tension the chain. When tensioned, the user typically places the chainsaw 100 sideways on a table, supported by the second grip 50. Therefore, the length of the second grip 50 in the vertical direction must be sufficient to stably support the entire machine when placed sideways. In this embodiment, the first fixing part 51 and the second fixing part 52 are respectively located on both sides of the third axis X3 of the guide plate 21 in the vertical direction, thereby allowing the chainsaw 100 to be stably placed sideways on the table via the second grip 50 and the battery pack mounting part 12.

[0062] Combination Figure 5 As shown, the first fixing part 51 and the second fixing part 52 are fixed to the housing 10 by screws. The housing 10 has fixing holes, and the first fixing part 51 and the second fixing part 52 are respectively provided with mounting holes. The screws pass through the fixing holes of the housing 10 from the inside and into the mounting holes, thereby beautifying the appearance and preventing the screws from being exposed and rusting.

[0063] In the above embodiments, the second gripping part 50 is configured as a straight connection between the first fixing part 51 and the second fixing part 52. In other embodiments, in order to improve the effective gripping area, the first fixing part 51 and the second fixing part 52 may also be configured as a curved structure, such as lateral bending in the left-right direction, tilting bending in the up-down direction, or rotating bending in the front-back direction, etc., which will not be described in detail here.

[0064] Please refer to Figures 1 to 5 As shown, the housing 10 includes a first housing 15 and a second housing 16 connected to the first housing 15. The first housing 15 and the second housing 16, when assembled, form a chamber for accommodating the functional component 30. This chamber includes a first chamber 101 accommodating a motor 31, a second chamber 102 accommodating a controller 32, and a third chamber 103 accommodating a gearbox 34. The first chamber 101 and the second chamber 102 are in fluid communication. In the front-rear direction, the first chamber 101 and the second chamber 102 are staggered front-rear.

[0065] Please refer to Figure 2 and Figure 3 As shown, the housing 10 includes an air inlet 151 disposed on the side of the first housing 15 and an air outlet 161 disposed on the bottom surface of the second housing 16. The air inlet 151 and the air outlet 161 are in fluid communication, and an airflow channel is formed between the air inlet 151 and the air outlet 161. The second gripping part 50 is connected to the second housing 16. The air inlet 151 is disposed in the second chamber 102, and the air outlet 161 is disposed in the first chamber 101. That is, the second chamber 102 is in fluid communication with the outside air through the air inlet 151, and the first chamber 101 is in fluid communication with the outside air through the air outlet 161.

[0066] Combination Figure 5 and Figure 6 As shown, the functional component 30 also includes a fan 36 connected to one end of the motor shaft 311. The motor 31 and the controller 32 are located in the airflow channel between the air inlet 151 and the air outlet 161. The motor 31 drives the fan 36 to rotate to create an air pressure difference between the inside and outside of the housing 10. Under the influence of the air pressure difference, the outside air enters the second chamber 102 from the air inlet 151, passes through the controller 32, and then enters the first chamber 101. After flowing through the gap of the motor 31, it flows out of the housing 10 from the air outlet 161.

[0067] The air inlet 151 is located between the motor 31 and the battery pack in the front-to-back direction. The controller 32 is located upstream of the motor 31 and close to the air inlet 151 within the airflow channel. Figure 2 and Figure 5 As shown. In this embodiment, the motor 31 is horizontally placed in the first chamber 101, and the controller 32 is vertically placed in the second chamber 102 with one side basically against the air inlet 151. This allows the cooling airflow from the outside air to flow over the surface of the controller 32 immediately after entering the housing 10, thereby dissipating heat from the controller 32. To improve the heat dissipation effect, the dimensions of the air inlet 151 in this embodiment are approximately the same as the height of the controller 32 in the vertical direction perpendicular to the front-back and left-right directions.

[0068] The motor 31 and controller 32 are staggered in the front-to-back direction. In the left-to-right direction, the controller 32 is located between the air inlet 151 and the motor 31, the fan 36 is located on the side of the motor 31 away from the controller 32, and the air outlet 161 is located close to the fan 36. Viewed from the front-to-back direction, the controller 32 at least partially overlaps with the motor 31 or the battery pack; viewed vertically from the front-to-back direction, the controller 32 is located between the motor 31 and the battery pack and is spaced apart from them. This allows for sufficient heat dissipation space between the three main heat-generating structures—the controller 32, the motor 31, and the battery pack—preventing them from being too close together and affecting each other's heat dissipation.

[0069] The chainsaw 100 includes a partition device 60 disposed between a first chamber 101 and a second chamber 102. The partition device 60 includes a partition plate 61 extending parallel to the controller 32 and a cover 62 at least partially surrounding the fan 36. The partition plate 61 extends inward from the inner wall of the first housing 15, forming a channel for airflow between itself and the controller 32. The lateral extension length of the partition plate 61 is greater than or equal to half the lateral dimension of the controller 32 (i.e., the width of the controller 32). This is to guide air entering the air inlet 151 to flow through at least half of the surface of the controller 32, thereby improving the cooling effect of the controller 32. Furthermore, the lateral ends of the partition plate 61 are spaced a certain distance from the motor 31, allowing airflow from the first chamber 101 to enter the first chamber 101 under the guidance of the partition plate 61 after flowing over the surface of the controller 32, thereby cooling the motor 31.

[0070] Please refer to Figure 5 and Figure 6 As shown, the cover 62 is detachably connected to the second housing 16, and includes a guide wall 621 surrounding the outer periphery of the fan 36 and a transverse wall 622 connecting the guide wall 621 and the motor 31. The guide wall 621 has a guide port 623 corresponding to the air outlet 161. The guide wall 621, transverse wall 622, and partition plate 61 physically separate the first chamber 101 and the second chamber 102, allowing the hot airflow after passing through the motor 31 to flow directly out of the air outlet 161 under the guidance of the guide wall 621, without flowing back from the outer periphery of the motor 31 to the first chamber 101, thus preventing the mixing of hot and cold airflows. The transverse wall 622 and the partition plate 61 form a fluid opening connecting the first chamber 101 and the second chamber 102, through which the airflow from the controller 32 enters the second chamber 102. In addition, the air outlet 161 is located on the bottom surface of the second housing 16. The hot air flow from the motor 31 will not blow onto the user or affect the cutting operation after it flows out of the air outlet 161.

[0071] like Figure 4 As shown, the angle between the fourth axis X4 formed by the connection of the motor shaft 311 and the output shaft 331 and the third axis X3 extending from the guide plate 21 is an acute angle. That is to say, the motor 31 is set on the lower rear side or the upper rear side of the gearbox 34, thereby reducing the overall length of the machine and improving the compactness of the structure. Placing the motor 31 and the gearbox 34 at an angle also expands the space between the motor 31 and the controller 32, improving the heat dissipation performance of both. In addition, by setting the air inlet 151 between the motor 31 and the battery pack, and the controller 32 is located in the airflow channel between the air inlet 151 and the air outlet 161 and is set close to the air inlet 151, the heat dissipation effect of the whole machine is improved.

[0072] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative power tools can be developed without departing from the principles and scope of this invention. The scope of protection of this invention is defined by the claims.

Claims

1. A power tool, comprising a housing, a working assembly extending forward from a front end of the housing, a motor for driving the working assembly, and a first grip and a second grip for a user to hold, the first grip extending along a first axis, the second grip including a first fixing portion and a second fixing portion connected to the housing, the first grip located on the top side of the housing, and the second grip located on the side side of the housing; characterized in that: The first fixing part and the second fixing part are connected to form a second axis. When viewed from the left-right direction perpendicular to the front-back direction, the first axis and the second axis intersect and the angle formed between them is greater than or equal to 40° and less than or equal to 75°. The motor is at least partially located between the first axis and the second axis. The motor includes a motor shaft. The power tool includes a gear assembly with an output shaft. The motor is drively connected to the gear assembly. The first fixing part is located in front of the output shaft, and the second fixing part is located in front of the motor shaft. The power tool includes a functional component housed in the housing. The functional component includes the motor, the gear assembly, and a gearbox for accommodating the gear assembly. The functional component has a contour area formed by the outer contour of the gearbox and the motor. When viewed from the left-right direction, the second fixing part is at least partially located within the contour area.

2. The power tool according to claim 1, characterized in that: The housing includes a first connecting region connected to the front end of the first gripping part and a second gripping region connected to the rear end of the first gripping part, and the first fixing part is at least partially disposed in the first connecting region.

3. The power tool according to claim 2, characterized in that: Viewed from the left and right direction, the intersection of the first axis and the second axis is located within the first connecting area, and the included angle between the first axis and the second axis is greater than or equal to 45° and less than or equal to 65°.

4. The power tool according to claim 1, characterized in that: The motor shaft extends in the left-right direction, and the output shaft is arranged parallel to the motor shaft. In the front-back direction, the center of the second fixing part is located between the motor shaft and the output shaft.

5. The power tool according to claim 4, characterized in that: The center of gravity of the power tool is located between the motor shaft and the output shaft in the front-to-back direction, and between the first fixed part and the second fixed part in the up-down direction perpendicular to the front-to-back direction.

6. The power tool according to claim 4, characterized in that: The working component includes a guide plate extending along a third axis, the motor shaft and the output shaft are connected to form a fourth axis, the angle between the fourth axis and the third axis is an acute angle, and the second fixing part is disposed on the lower front side of the motor shaft.

7. The power tool according to claim 1, characterized in that: The second grip portion includes a first segment extending from the first fixing portion, a second segment extending from the second fixing portion, and a third segment connecting the first segment and the second segment. The second grip portion includes an effective grip area located on at least one of the first segment and the third segment. The length of the effective grip area decreases as the angle between the first axis and the second axis increases.

8. The power tool according to claim 1, characterized in that: The working assembly includes a guide plate extending along a third axis, and the first fixing part and the second fixing part are located on both sides of the third axis in a vertical direction perpendicular to the front and back.

9. The power tool according to claim 8, characterized in that: The first grip portion is located on the top side of the housing, and the angle between the first axis and the third axis is between 0° and 15°.

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