CN117084046A

CN117084046A - Long rod type power tool

Info

Publication number: CN117084046A
Application number: CN202210517129.4A
Authority: CN
Inventors: 山冈敏成; 何诗尧; 漆芹
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2023-11-21

Abstract

The application discloses a long rod type power tool, which comprises: a front-end device including an output assembly for outputting power and a front housing supporting the output assembly; a back end device comprising a motor and a back housing; the connecting rod assembly is used for connecting the front end device and the rear end device; the connecting rod assembly includes: a connecting rod; a transmission shaft connected to the motor and the output assembly; the transmission shaft is at least partially arranged in the connecting rod, the extending direction of the transmission shaft is basically the same as that of the connecting rod, the transmission shaft comprises a hollow shaft part, the hollow shaft part comprises a first inner wall defining a first inner hole, the part of the connecting rod for accommodating the hollow shaft part is defined as an accommodating rod, the accommodating rod comprises a second inner wall defining a second inner hole, and the weight of the whole unit length formed by the accommodating rod and the hollow shaft part is more than or equal to 300g/m and less than or equal to 500g/m. The long rod type power tool can enable a user to operate more labor-saving and convenient.

Description

Long rod type power tool

Technical Field

The application relates to the technical field of power tools, in particular to a long rod type power tool.

Background

A common long-stick type power tool generally includes: a long-rod grass trimmer, a long-rod pruning machine, a long-rod chain saw, a long-rod grinding machine and the like. In operation, a user typically needs to hold the handle to extend the output assembly to a remote working area for operation. Thus, these long-bar type power tools may include a long connecting bar assembly. The user is tired after operating the long-rod type power tool for a long time, and the working efficiency is reduced.

Content of the application

In order to solve the defects in the prior art, the application aims to provide a long rod type power tool which is convenient for a user to operate more labor-saving.

In order to achieve the above object, the present application adopts the following technical scheme:

a pole-type power tool comprising: a front-end device including an output assembly for outputting power and a front housing supporting the output assembly; a rear end device including a motor for driving the output assembly and a rear housing supporting the motor; the connecting rod assembly is used for connecting the front end device and the rear end device; the connecting rod assembly includes: the connecting rod is used for connecting the front end shell and the rear end shell; a drive shaft connected to the motor and the output assembly, the drive shaft for transmitting power between the motor and the output assembly; the transmission shaft is at least partially arranged in the connecting rod, the extending direction of the transmission shaft is basically the same as that of the connecting rod, the transmission shaft comprises a hollow shaft part, the hollow shaft part comprises a first inner wall defining a first inner hole, the part of the connecting rod for accommodating the hollow shaft part is defined as an accommodating rod, and the weight of the whole unit length formed by the accommodating rod and the hollow shaft part and the second inner wall defining a second inner hole is more than or equal to 300g/m and less than or equal to 500g/m.

In some embodiments, the weight per unit length of the containment rod is greater than or equal to 180g/m and less than or equal to 300g/m.

In some embodiments, the hollow shaft portion has a weight per unit length of 100g/m or less and 200g/m or less.

In some embodiments, the containment rod comprises a carbon fiber material.

In some embodiments, the ratio of the stiffness of the containment rod to the weight per unit length of the containment rod is greater than or equal to 150 (hrc.g)/m and less than or equal to 280 (hrc.g)/m.

In some embodiments, the density of the containment bars is greater than or equal to 1.4g/cm ³ And less than or equal to 1.8g/cm ³ 。

In some embodiments, the weight of the connecting rod is greater than or equal to 300g and less than or equal to 400g.

In some embodiments, the ratio of the weight of the connecting rod assembly to the weight of the long rod-like power tool is greater than or equal to 0.1 and less than or equal to 0.2.

In some embodiments, the ratio of the inner diameter of the first bore to the outer diameter of the hollow shaft portion is greater than or equal to 0.5 and less than or equal to 0.8.

In some embodiments, the ratio of the density of the hollow shaft portion to the density of the connecting rod is greater than or equal to 0.5 and less than or equal to 0.8.

A pole-type power tool comprising: a front-end device including an output assembly for outputting power and a front housing supporting the output assembly; a rear end device including a motor for driving the output assembly and a rear housing supporting the motor; the connecting rod assembly is used for connecting the front end device and the rear end device; wherein, the connecting rod assembly includes: a connecting rod connecting the front housing and the rear housing; a drive shaft coupled to the motor and the output assembly, the drive shaft configured to transfer power between the motor and the output assembly; the transmission shaft is at least partially arranged in the connecting rod, and the ratio of the total weight of the connecting rod and the transmission shaft to the length of the connecting rod is more than or equal to 300g/m and less than or equal to 480g/m.

A grass trimmer comprising: the front-end device comprises an output assembly for outputting power and a front shell for supporting the output assembly, and the output assembly comprises a grass cutting head for cutting grass; a rear end device including a motor for driving the output assembly and a rear housing supporting the motor; the connecting rod assembly is used for connecting the front end device and the rear end device; wherein, the connecting rod assembly includes: a connecting rod connecting the front housing and the rear housing; a drive shaft coupled to the motor and the output assembly, the drive shaft configured to transfer power between the motor and the output assembly; wherein the transmission shaft is at least partially arranged in the connecting rod, and the ratio of the total weight of the connecting rod assembly and the front end device to the bare metal weight of the grass trimmer is more than or equal to 0.3 and less than or equal to 0.42.

The application has the advantages that: the center of gravity of the long rod type power tool is reasonable in arrangement, good in balance and capable of being operated more labor-saving and convenient for a user.

Drawings

FIG. 1 is a block diagram of a long-pole type power tool of one embodiment;

FIG. 2 is a perspective view of the power tool of the long stick type of FIG. 1 with the energy source device removed;

FIG. 3 is a cross-sectional view of the power tool of the long stick type of FIG. 2;

fig. 4 is an enlarged view of a partial region in fig. 3;

FIG. 5 is an enlarged view of another partial area in FIG. 3;

FIG. 6 is a cross-sectional view of the connecting rod assembly of the long rod-like power tool of FIG. 2;

FIG. 7 is a block diagram of a power tool of one embodiment

FIG. 8 is an exploded view of an embodiment of a long-pole type power tool;

FIG. 9 is a perspective view of another embodiment of a power tool;

FIG. 10 is a perspective view of a power tool of yet another embodiment;

fig. 11 is a perspective view of a power tool of yet another embodiment.

Detailed Description

The long-pole type power tool 900 shown in fig. 1 is specifically a grass trimmer, which is used for a user to operate to break grass on a lawn, so as to achieve the purpose of repairing the lawn. It will be appreciated that the pole type power tool may be other pole type tools, may be a pole type garden tool, may be a pole type grinding tool, and may be a pole type cutting tool. More specifically, the long-pole type power tool may be a long-pole pruner, a long-pole chain saw, a long-pole sander, a long-pole lawn trimmer, a long-pole brush cutter, or the like. In fact, the technical solution disclosed in this embodiment can be adopted by long rod type power tools with a connecting rod assembly.

As shown in fig. 1, in the present embodiment, the long-pole type power tool 900 is an electric tool. It will be appreciated that in other embodiments, the long-stem type power tool 900 may also employ fuel as an energy source, with the long-stem type power tool 900 being an engine type tool. In this embodiment, the long-pole type power tool 900 is a dc tool. It will be appreciated that in other embodiments, the long-pole type power tool 900 may also be an ac tool.

As shown in fig. 1 to 3, the long-pole type power tool 900 includes: front end 910, back end 920, and connecting rod assembly 930. The front end device 910 includes an output assembly 911 and a front housing 912 for supporting the output assembly 911. The back-end apparatus 920 includes a motor 921 and a back housing 922 for supporting the motor 921. The linkage assembly 930 connects the front end device 910 and the back end device 920.

As shown in fig. 3-5, the rear end device 920 is disposed at the rear end 931 of the tie bar assembly 930. The motor 921 is for driving the output assembly 911 to move, and the rear housing 922 is formed with a first receiving cavity 9222, and the motor 921 is disposed in the first receiving cavity 9222. The backend device 920 may further include a first transmission assembly 923 for outputting power of the motor 921, the first transmission assembly 923 being disposed within the first receiving cavity 9222. The rear housing 922 is also formed with a coupling portion 9221, the coupling portion 9221 being for coupling an energy source device 924 for supplying energy to the motor 921. In the present embodiment, the motor 921 is an electric motor, and the energy source device 924 includes a battery pack detachably attached to the coupling portion 9221.

The front end device 910 is disposed at a front end 932 of the connecting rod assembly 930, and the output assembly 911 is configured to output power. In this embodiment, the pole-type power tool 900 is a grass trimmer, and the output assembly 911 includes a grass trimmer head 9111 and a second transmission assembly 9112. The front housing 912 supports the second transmission assembly 9112, the front housing 912 is formed with a second receiving cavity 9121, and the second transmission assembly 9112 is disposed within the second receiving cavity 9121. The grass cutting head 9111 is provided with a grass cutting rope 9113, and when the grass cutting head 9111 rotates, the grass cutting rope 9113 can be driven to rotate at a high speed so as to cut off grass on a lawn. It is to be appreciated that in other embodiments, the output component 911 may also be an output device that can perform other functions. For example, when the long bar-type power tool is a long bar chain saw, the output assembly includes a saw blade, a guide plate, a sprocket, and the like, and the front housing supports the sprocket and the guide plate.

The connecting rod assembly 930 includes: a connecting rod 933 and a drive shaft 934. The connecting rod 933 connects the front housing 912 and the rear housing 922, the connecting rod 933 further including a first connecting end 9331 connected to the rear housing 922 and a second connecting end 9332 connected to the front housing 912. The drive shaft 934 is used to transfer power between the motor 921 and the output assembly 911. The transmission shaft 934 connects the motor 921 and the output member 911, and power output from the motor 921 is transmitted to the output member 911 through the transmission shaft 934 to drive the output member 911 to move. The drive shaft 934 includes a first drive end 9341 and a second drive end 9342, the first drive end 9341 being coupled to the motor 921 and the second drive end 9342 being coupled to the output assembly 911. More specifically, the first drive end 9341 is coupled to a first drive assembly 923 to effect coupling of the first drive end 9341 to the motor 921, the first drive assembly 923 transmitting power between the motor 921 and the drive shaft 934. The second drive end 9342 is coupled to the second drive assembly 9112 to effect coupling of the second drive end 9342 to the output assembly 911, and the second drive assembly 9112 transfers power between the drive shaft 934 and the output assembly 911.

The connection in this embodiment may be a direct connection or an indirect connection. Direct connection means that two parts are connected together without an intermediate piece, and indirect connection means that two parts are respectively connected with at least one intermediate piece, and the two parts are connected through the intermediate piece.

In this embodiment, drive shaft 934 is at least partially disposed within connecting rod 933. The extension direction of the transmission shaft 934 is substantially the same as the extension direction of the connection rod 933. The connection rod 933 extends in the front-rear direction, and the transmission shaft 934 extends in the front-rear direction and is disposed within the connection rod 933. In the present embodiment, the connection rod 933 extends in the direction of the first straight line 901. In other embodiments, the connecting rod may not extend along a straight line, the connecting rod may extend along a curved line, or a combination of straight and curved lines, and correspondingly, the drive shaft 934 may not extend along a straight line.

As described in fig. 1 to 6, the drive shaft 934 includes a hollow shaft portion 9343, the hollow shaft portion 9343 including a first inner wall 9344, the first inner wall 9344 surrounding a first inner bore 9345. The portion of the connection rod 933 for accommodating the hollow shaft portion 9343 is defined as an accommodating rod 9333, the accommodating rod 9333 includes a second inner wall 9334, the second inner wall 9334 defines a second inner hole 9335, and the hollow shaft portion 9343 is disposed within the second inner hole 9335. The weight per unit length of the whole of the accommodation rod 9333 and the hollow shaft 9343 is greater than or equal to 300g/m and less than or equal to 500g/m. The weight per unit length of the whole of the accommodation lever 9333 and the hollow shaft portion 9343 will be explained in detail. As shown in fig. 2, in the extending direction of the connecting rod 933, an arbitrary piece of the accommodating rod 9333 is taken, and a piece of the hollow shaft portion 9343 corresponding to the accommodating rod 9333 is taken, and then the ratio of the total weight of the arbitrary piece of the accommodating rod 9333 and the piece of the hollow shaft portion 9343 to the length L of the arbitrary piece of the accommodating rod 9333 is defined as the weight per unit length of the entire body of the accommodating rod 9333 and the hollow shaft portion 9343.

Alternatively, in some embodiments, the weight per unit length of the whole of the accommodation lever 9333 and the hollow shaft portion 9343 is greater than or equal to 330g/m and less than or equal to 450g/m. Alternatively, in some embodiments, the weight per unit length of the whole of the accommodation lever 9333 and the hollow shaft portion 9343 is greater than or equal to 350g/m and less than or equal to 420g/m.

In this way, the weight of the connector rod assembly 930 and the length of the connector rod assembly 930 may be better matched. The weight of the connecting rod assembly 930 can be reduced under the condition that the length of the connecting rod assembly 930 is fixed, the user can save more labor during operation, the power consumption of the long rod type power tool 900 can be reduced, and the endurance time of the long rod type power tool 900 can be prolonged. Alternatively, where the weight of the connecting rod assembly 930 is fixed, the length of the connecting rod assembly 930 may be allowed to increase, thereby allowing the long rod-type power tool 900 to operate in a larger, more remote working area. Still alternatively, the weight of the connector rod assembly 930 and the length of the connector rod assembly 930 are matched so that the long rod-type power tool 900 performs more labor-saving work in an optimal working area.

More specifically, the weight per unit length of the accommodation lever 9333 is greater than or equal to 180g/m and less than or equal to 300g/m. The ratio of the hardness of the accommodation lever 9333 to the weight per unit length of the accommodation lever 9333 is greater than or equal to 150 (hrc.g)/m and less than or equal to 280 (hrc.g)/m. In some embodiments, the weight per unit length of the containment rod 9333 is greater than or equal to 210g/m and less than or equal to 270g/m, and the ratio of the stiffness of the containment rod 9333 to the weight per unit length of the containment rod 9333 is greater than or equal to 170 (hrc.g)/m and less than or equal to 250 (hrc.g)/m. In this way, in the case where the hardness of the accommodation lever 9333 is sufficient to support the entire long-pole-type power tool 900, the weight of the accommodation lever 9333 can also be reduced as much as possible, thereby enabling the weight of the long-pole-type power tool 900 to be reduced. The present application provides a reduced weight of the power tool 900 relative to conventional heavy stick-type power tools.

The ratio of the weight per unit length of the accommodation rod 9333 to the outer diameter of the accommodation rod 9333 is greater than or equal to 9000g/m ² And less than or equal to 10000g/m ² . In this way, in the case where the outer diameter of the accommodation lever 9333 is suitable for the user to hold, the weight of the accommodation lever 9333 is as low as possible, thereby making the overall weight of the long-rod type power tool 900 low. Furthermore, because the weight of the receiving lever 9333 is low, the center of gravity of the long-lever-type power tool 900 can be conveniently adjusted by setting the weights of the front-end device 910 and the rear-end device 920, and thus the center of gravity of the long-lever-type power tool 900 can be reasonably set to meet the ergonomic requirement.

In the present embodiment, the accommodation lever 9333 includes a carbon fiber material. In fact, it will be appreciated that the material of the receiving rod 9333 may also comprise other materials. The density of the accommodation bars 9333 is greater than or equal to 1.4g/cm ³ And less than or equal to 1.8g/cm ³ . In this way, the weight of the connecting rod 933 can be made to be greater than or equal to 300g and less than or equal to 400g, so that the weight of the connecting rod 933 can be greatly reduced relative to the weight of the whole machine. In some embodiments, the density of containment rod 9333 is greater than or equal to 1.5g/cm ³ And less than or equal to 1.7g/cm ³ The weight of the connecting rod 933 is greater than or equal to 320g and less than or equal to 380g.

The first and second drive ends 9341, 9342 of the drive shaft 934 are each disposed within the connecting rod 933. The first bore 9345 extends through the drive shaft 934 in the direction of the first straight line 901 such that the entire drive shaft 934 is hollow and the entire drive shaft 934 forms the hollow shaft portion 9343. The hollow shaft portion 9343 has a weight per unit length of greater than or equal to 100g/m and less than or equal to 200g/m. This may enable the weight of the hollow shaft portion 9343 to be reduced, the weight of the connecting rod 933 to be set smaller, and thus the weight of the entire connecting rod assembly 930 to be reduced. In this embodiment, the ratio of the weight of the connecting rod assembly 930 to the bare metal weight of the long pole type power tool 900 is greater than or equal to 0.1 and less than or equal to 0.2. It should be noted that, the weight of the connecting rod assembly 930 is the sum of the weight of the connecting rod 933 and the weight of the transmission shaft 934. In the present embodiment, after the weight of the long-pole type power tool 900 is reduced, the user does not feel tired even when working for a long time, thereby improving the working efficiency of the user, and also reducing the manufacturing cost of the long-pole type power tool 900. In some embodiments, the weight per unit length of the hollow shaft portion 9343 is greater than or equal to 180g/m and less than or equal to 220g/m, and the ratio of the weight of the connecting rod assembly 930 to the bare metal weight of the long pole type power tool 900 is greater than or equal to 0.12 and less than or equal to 0.18. The bare metal weight of the long-pole power tool 900 refers to the weight of the long-pole power tool 900 when the energy source device 924 is not mounted, that is, the weight of the main unit of the long-pole power tool 900 shown in fig. 2, and the bare metal weight refers to the weight of the long-pole power tool 900 when the battery pack is not mounted. If the energy source is a fuel source, the bare metal weight of the long-pole power tool 900 refers to the weight of the tool when the fuel tank of the fuel source is not filled with fuel. In this embodiment, the long-pole type power tool 900 is a lawnmower, and the ratio of the combined weight of the connecting rod assembly 930 and the front end device 910 to the bare metal weight of the lawnmower is greater than or equal to 0.3 and less than or equal to 0.42. In some embodiments, the ratio of the combined weight of the connecting rod assembly 930 and the front end device 910 to the bare metal weight of the lawnmower is greater than or equal to 0.35 and less than or equal to 0.4.

In this embodiment, the ratio of the total weight of the connecting rod 933 and the drive shaft 934 to the length of the connecting rod 933 is greater than or equal to 300g/m and less than or equal to 480g/m. In some embodiments, the ratio of the total weight of the connecting rod 933 and the drive shaft 934 to the length of the connecting rod 933 is greater than or equal to 350g/m and less than or equal to 450g/m. In this way, in the case where the length of the long-pole type power tool 900 satisfies the user's demand, the total weight of the connection rod 933 and the transmission shaft 934 can be as small as possible, so that the weight of the entire machine can be reduced. For the grass trimmer, since the grass trimmer is sometimes required to trim the grass at the root of the bush, the grass trimmer is required to extend to a far working area for working, and the length of the connecting rod 933 of the grass trimmer is required to be set long enough. The longer connecting rods 933 result in an increase in weight of the connecting rod assembly 930, while in the present application, the weight of the connecting rod assembly 930 is reduced by the materials and structure of the connecting rods 933 and the drive shafts 934. Therefore, the grass trimmer can also improve the working efficiency of the user under the condition of meeting the user demand.

In the present embodiment, the hollow shaft portion 9343 is made of a first material, and the connection rod 933 is made of another material different from the first material. Specifically, the connection rod 933 includes a carbon fiber material, and a ratio of a density of the hollow shaft portion 9343 to a density of the connection rod 933 is greater than or equal to 4 and less than or equal to 7. In this way, the weight of the connecting rod 933 is greatly reduced relative to the weight of the hollow shaft portion 9343, and the weight of the hollow shaft portion 9343 is also greatly reduced relative to the weight of the existing solid shaft, thereby reducing the weight of the entire connecting rod assembly 930. In some embodiments, the ratio of the density of the hollow shaft portion 9343 to the density of the connecting rod 933 is greater than or equal to 4.5 and less than or equal to 5.5.

The first inner bore 9345 is a circular bore, which reduces the machining cost and improves stability of the drive shaft 934. The ratio of the inner diameter of the first inner bore 9345 to the outer diameter of the hollow shaft 9343 is greater than or equal to 2.5 and less than or equal to 3.5. Specifically, the inner diameter of the first inner hole 9345 is greater than or equal to 18mm and less than or equal to 25mm, and the outer diameter of the hollow shaft portion 9343 is greater than or equal to 5mm and less than or equal to 10mm. In this way, not only can the size of the hollow shaft portion 9343 meet the strength requirement, but also the weight of the hollow shaft can be reduced. That is, by making the inner diameter of the first inner hole 9345 and the outer diameter of the hollow shaft portion 9343 reasonably and mutually balanced, the strength and weight of the hollow shaft portion 9343 are well matched. In this embodiment, to improve stability of the drive shaft 934, a support assembly 935 is further disposed within the connection rod 933, and the support assembly 935 is disposed between the connection rod 933 and the drive shaft 934 to support the drive shaft 934.

As shown in fig. 4 and 5, the motor 921 includes: the stator, the rotor, and the motor shaft 9211, the motor shaft 9211 outputs power to the first transmission assembly 923, the first transmission assembly 923 transmits power to the transmission shaft 934, and the rotation axis 903 of the transmission shaft 934 and the rotation axis 904 of the motor shaft 9211 are parallel to each other. The first transmission assembly 923 includes: the first gear 9231, the second gear 9232 and the first connector 9233, the second gear 9232 is meshed with the first gear 9231, and the first connector 9233 is in spline fit with the second gear 9232, so that the first connector 9233 and the second gear 9232 form synchronous rotation. Specifically, the first gear 9231 is connected to the motor shaft 9211, and the second gear 9232 is connected to the transmission shaft 934 through the first connector 9233. When the motor 921 is started, the first gear 9231 transmits power to the second gear 9232, and the second gear 9232 drives the transmission shaft 934 to rotate through the first connecting piece 9233. In this embodiment, the transmission shaft 934 is made of a first material, and the first connector 9233 is made of a second material different from the first material. In this way, the second material may be provided with a hardness that is somewhat greater than the first material, and the second material may also be more durable than the first material, so that the first connector 9233 may be more suitable for forming a spline structure. The provision of the first connector 9233 in this embodiment makes the hardness, durability, etc. of the material of the transmission shaft 934 lower than that of the spline structure formed directly on the transmission shaft 934, so that the cost of the transmission shaft 934 can be reduced. In addition, the spline structure is disposed on the first connector 9233 instead of the transmission shaft 934, so that the first inner hole 9345 on the transmission shaft 934 is a circular hole, which can reduce the cost of the transmission shaft 934 and improve the stability of the transmission shaft 934. The drive shaft 934 and the first connector 9233 form a non-removable connection to facilitate installation. Specifically, the first connector 9233 is connected to the drive shaft 934 by a weld, specifically a friction weld. The ratio of the hardness of the first connector 9233 to the hardness of the drive shaft 934 is greater than or equal to 1.05 and less than or equal to 1.6.

As shown in fig. 4 and 5, the grass-cutting head 9111 includes: the spool 9114, the head housing 9115 and the driving shaft 9116, the driving shaft 9116 is connected with the head housing 9115, the driving shaft 9116 drives the head housing 9115 to rotate, and the head housing 9115 drives the spool 9114 to rotate together so that the grass rope 9113 rotates at a high speed. It is understood that in other embodiments, the drive shaft 9116 may be coupled to the spool 9114, and the drive shaft 9116 drives the spool 9114 to rotate.

The drive shaft 934 outputs power to the second transmission assembly 9112, the second transmission assembly 9112 transmits power to the drive shaft 9116, the axis of rotation 903 of the drive shaft 934 and the axis of rotation 905 of the drive shaft 9116 obliquely intersect. The second transmission assembly 9112 includes: third gear 9117, fourth gear 9118 and second connector 9119, fourth gear 9118 meshes with third gear 9117, second connector 9119 is in spline fit with fourth gear 9118, so that second connector 9119 and fourth gear 9118 constitute synchronous rotation. Specifically, third gear 9117 is coupled to drive shaft 9116 in output assembly 911 and fourth gear 9118 is coupled to drive shaft 934 via second coupling 9119. When the transmission shaft 934 rotates, the transmission shaft 934 transmits power to the fourth gear 9118 through the second connector 9119, the fourth gear 9118 drives the third gear 9117 to rotate, and the third gear 9117 drives the driving shaft 9116 to rotate, so that the grass-mowing head 9111 rotates.

In this embodiment, the transmission shaft 934 is made of a first material, and the second connector 9119 is made of a third material different from the first material. In this way, the third material may be provided with a hardness that is somewhat greater than the first material, and the durability of the third material may also be better than the durability of the first material, so that second connector 9119 may be more suitable for forming a spline structure. The provision of second connector 9119 in the present embodiment makes the hardness, durability, etc. of the material of drive shaft 934 lower than that of the spline structure formed directly on drive shaft 934, so that the cost of drive shaft 934 can be reduced. In addition, the spline structure is disposed on second connector 9119 instead of drive shaft 934, such that first inner bore 9345 on drive shaft 934 is a circular bore, which may reduce the cost of drive shaft 934 and increase the stability of drive shaft 934. The drive shaft 934 and the second connector 9119 form a non-detachable connection, thereby facilitating installation. Specifically, second connector 9119 is connected to drive shaft 934 by a weld, specifically a friction weld. The ratio of the hardness of second connector 9119 to the hardness of drive shaft 934 is greater than or equal to 1.05 and less than or equal to 1.6. In this embodiment, the second material is the same as the third material. It will be appreciated that in other embodiments, the second material may be different from the third material.

As shown in fig. 3 and 4, the long-rod type power tool 900 further includes a circuit board assembly 94, the circuit board assembly 94 includes a circuit board 941 and a mounting case 942 for mounting the circuit board, and the mounting case 942 is made of a metal material, so that heat dissipation of the circuit board 941 is facilitated.

In this embodiment, the long-rod-type power tool 900 further includes a cable at least partially disposed within the connection rod 933, the cable passing through the connection rod 933, one end of the cable being disposed in the rear housing 922 and the other end of the cable being disposed in the front housing 912. The cable is electrically connected to the circuit board assembly 94 to control the electrical devices located at the front end 932 of the connector assembly 930. The cable is also electrically connected with the battery pack to power the power device. The electrical device may be a light emitting element disposed at the front end 932 of the connector assembly 930.

The power tool 900a of the embodiment shown in fig. 7 is embodied as a long-pole type power tool, and is embodied as a grass cutter. It will be appreciated that the power tool may also be a hand-held power tool, such as a drill, pruner, sander, or the like. Alternatively, the power tool may be a table-type tool, such as a table saw, miter saw, or the like. Alternatively, the power tool may be a hand propelled power tool, such as a hand propelled mower, a hand propelled snowplow. Alternatively, the power tool may also be a riding power tool, such as a riding lawn mower, a riding vehicle, an all-terrain vehicle, or the like. Alternatively, the power tool may also be a robotic tool, such as a mowing robot, snowplow robot, or the like.

In some embodiments, the power tool may be a power tool, which may be an electric drill, an electric light, an electric vehicle, or the like. Alternatively, the power tool may be an engine-type power tool, such as an engine-type mower, or the like.

In some embodiments, the power tool may also be a garden tool, such as a pruner, blower, mower, chain saw, or the like. Alternatively, the power tool may be a decorative tool such as a screwdriver, nail gun, circular saw, sander, or the like.

In some embodiments, the power tool may also be a vegetation care tool, such as a lawnmower, mower, pruner, chain saw, or the like. Alternatively, the power tool may be a cleaning tool such as a blower, snowplow, washer, or the like. Alternatively, the power tool may be a drill-type tool, such as a drill, a screwdriver, a wrench, a hammer, or the like. Alternatively, the power tool may be a saw-type tool, such as a reciprocating saw, a jig saw, a circular saw, or the like. Alternatively, the power tool may be a table-type tool, such as a table saw, miter saw, metal cutting machine, electric wood-milling, or the like. Alternatively, the power tool may be a sanding type tool, such as an angle grinder, sander, or the like. Alternatively, the power tool may be other power tools, such as a light, a fan, or the like.

It can be understood that as long as the power equipment with the motor can adopt the technical scheme disclosed by the embodiment, the power equipment adopting the technical scheme disclosed by the embodiment belongs to the protection scope of the application. For example, the power plant may also be a power head 902b as shown in fig. 8, the power head 902b including a motor, the power head 902b being adapted to adapt some of the output components to perform the function of the tool.

As shown in fig. 7, the power tool 900a includes: an output assembly 910a, a motor 920a, an energy source device 930a, and a support 940a. In this embodiment, the power tool 900a is a grass cutter, and the power tool 900a further includes a connecting rod assembly 950a, wherein the connecting rod assembly 950a connects the output assembly 910a at the front end 951a and the energy source device 930a at the rear end 952 a.

The output assembly 910a is disposed at a front end 951a of the connecting rod assembly 950a for outputting power. In this embodiment, the output assembly 910a includes a grass cutting head 911a, and the grass cutting head 911a can drive the grass cutting rope to cut grass when rotating at a high speed. The motor 920a is disposed at the front end 951a of the connection rod assembly 950a, and the motor 920a is used to drive the output assembly 910a. In this embodiment, the motor 920a is an electric motor, and the electric motor includes a rotating shaft for outputting power, and the rotating shaft is connected to the grass cutting head 911a to drive the grass cutting head 911a to rotate. The energy source device 930a is configured to provide energy to the motor 920 a. In this embodiment, the motor 920a is an electric motor, and the energy source device 930a is a power source device that can supply power to the electric motor, and the power source device may be a battery pack. Or in other embodiments the power supply means is an ac cable connectable to mains. In other embodiments, the motor 920a is an engine and the energy source device 930a is a fuel that can power the engine. The support 940a is for supporting at least one of the output assembly 910a, the motor 920a, and the energy source device 930a. In the present embodiment, the supporting member 940a is a housing supporting the motor 920 a.

The support in the present application may be a direct support or an indirect support. Direct support refers to the absence of other intermediate pieces between two parts such that one part directly supports the other part. Indirect support means that an intermediate member is provided between two parts, the intermediate member being supported by one part and the intermediate member supporting the other part such that the part indirectly supports the other part.

As described above, in the present embodiment, the supporting member 940a is a housing, and the housing is disposed at the front end 951a of the connecting rod assembly 950 a. The housing forms a receiving chamber in which the motor 920a is disposed such that the support 940a supports the motor 920a. Support 940a comprises a carbon fiber material, and the ratio of the density of support 940a to the tensile strength of support 940a is greater than or equal to 4.5 kg/(m) ³ MPa) and less than or equal to 15 kg/(m) ³ MPa). In this way, the density of the supporting piece 940a can be reduced as much as possible under the condition that the tensile strength of the supporting piece 940a satisfies the requirement of the supporting motor 920a, so that the mass of the supporting piece 940a can be advantageously reduced. For the grass trimmer, the supporting piece 940a has larger hardness, so that the motor 920a can be stably supported and protected, and the service life of the grass trimmer is ensured. At the same time, the support 940a is less dense, thus reducing the weight of the device at the front end 951a of the connecting rod assembly 950a, so that the user can easily move or lift the grass trimmer with less effort on the user's hand while holding the grass trimmer for work. Thus, the user does not feel tired even in long-time work, and the work efficiency is improved. At the position of In the present embodiment, the ratio of the density of the supporting member 940a to the tensile strength of the supporting member 940a is greater than or equal to 6 kg/(m) ³ MPa) and less than or equal to 12 kg/(m) ³ MPa), so that the density of the supporting piece 940a is well matched with the tensile strength of the supporting piece 940a, the problem that the tensile strength of the supporting piece 940a is insufficient to effectively protect and support the motor 920a is avoided, and the problem that the device of the front end 951a of the connecting rod assembly 950a is too heavy due to too high density of the supporting piece 940a is also avoided. Compared with the prior art grass cutting machine in which the motor housing is made of aluminum substrate or steel, the housing for accommodating the motor 920a of the present application can meet the requirement of tensile strength of the motor 920a housing of the prior art, and more importantly, the weight of the housing of the present application is reduced by nearly 50% relative to the prior art motor housing, which greatly reduces the weight of the device at the front end 951a of the grass cutting machine, and the center of gravity of the grass cutting machine is closer to the rear end 952a of the connecting rod assembly 950a, so that the requirements of ergonomics are met.

In the present embodiment, the supporting member 940a is made of a carbon fiber composite material, which is easy to manufacture and form, and has a relatively high tensile strength, and more importantly, a relatively low density. Specifically, the supporting member 940a includes: the strength of the supporting piece 940a is relatively high after the first material and the second material are compounded. In the present embodiment, the tensile strength of the supporting member 940a is greater than or equal to 100Mpa and less than or equal to 200Mpa, so that the supporting member 940a is not easily deformed. The first material is the carbon fiber material, the second material is different from the first material, the second material can be plastic, and the reinforced carbon fiber composite material is formed by compounding the carbon fiber material and the plastic. More specifically, the ratio of the weight of the carbon fiber material in support 940a to the weight of the second material in support 940a is greater than or equal to 0.3 and less than or equal to 0.6. This allows the stiffness and tensile strength of the carbon fiber composite to meet the strength requirements of the support for the motor 920a, and also allows the density of the support 940a to be reduced as much as possible. For example, in the present embodiment, the density of the supporting pieces 940a is greater than or equal to 0.9g +. cm ³ And less than or equal to 2g/cm ³ Thus, the weight of the supporting member 940a can be greatly reduced, which is advantageous in reducing the weight of the front end device and improving the center of gravity position of the power tool 900 a.

In some embodiments, the tensile strength of support 940a is greater than or equal to 120Mpa and less than or equal to 180Mpa. The ratio of the weight of the carbon fiber material in support 940a to the weight of the second material in support 940a is greater than or equal to 0.35 and less than or equal to 0.5. The density of the support 940a is greater than or equal to 1g/cm ³ And less than or equal to 1.5 g/cm ³ 。

In the present embodiment, the supporting member 940a is made of a carbon fiber composite material. The support 940a is a non-cylindrical structure. That is, support 940a is provided with non-cylindrical structures, such as containment shells, for accommodating the structure of the supported elements. The supporting member 940a of the present embodiment is a non-cylindrical body. It should be noted that if the inner side of the support member 940a is a cylindrical surface and the outer side is a non-cylindrical surface, the support member 940a is considered to be a non-cylindrical body.

The support 940a is formed of a carbon fiber composite material manufactured through a profile molding process. Specifically, the special-shaped molding process is an injection molding process. That is, the support 940a may be manufactured from a carbon fiber composite material through an injection molding process. Particularly, for the case supporting the motor 920a, the case can be manufactured at low cost through an injection molding process. Carbon fiber composites can be manufactured by a variety of low cost manufacturing processes relative to carbon fiber materials. While carbon fiber composites can be more easily processed into a variety of different shapes relative to carbon fiber materials. It should be noted that the shape of the mold corresponding to the shape of the supporting member 940a is a shaped structure, and the shaped structure is a non-cylindrical body. The mold, which is a substantially cylindrical body, is not a shaped mold, but the shaped molding process of the present embodiment employs a shaped mold. The special-shaped molding process may be a plastic molding process, which refers to the process of manufacturing the carbon fiber composite material to form the support member in the embodiment, which is the same as the plastic molding process, such as an injection molding process, a plastic suction molding process, a blow molding process, an extrusion molding process, and the like.

In the present embodiment, the motor 920a of the grass cutter is disposed at the front end 951a of the link assembly 950a, and the supporting member 940a serves as a housing supporting the motor 920 a. It will be appreciated that in other embodiments, the support may support the output assembly or the energy source device and the receiving cavity may receive the output assembly or the energy source device. For example, for the long-pole type power tool 900 of the embodiment shown in fig. 1-6, the support may support the output assembly 911. Specifically, as shown in fig. 1 and 5, the supporting member is a front housing 912 supporting the output assembly 911, the second transmission assembly 9112 is disposed in the front housing 912, and the front housing 912 supports the second transmission assembly 9112. In this way, the tensile strength of the front housing 912 of the long-pole type power tool 900 can satisfy the requirement of supporting the output member 911, and the weight of the front-end device 910 can be reduced, so that the work efficiency of the user can be improved and the position of the center of gravity of the long-pole type power tool 900 can be advantageously improved.

Indeed, not only support 940a may be made of a carbon fiber composite material, but in other embodiments, other elements in power tool 900a may also be made of a carbon fiber composite material. It will be appreciated that some of the external structural elements of the power tool that are required for tensile strength may be made of carbon fiber composite materials. At least one element in a power tool is made of a carbon fiber composite material, the tensile strength of the at least one element meeting the requirements, and the density of the at least one element also being reduced. Specifically, the ratio of the density of the at least one element to the tensile strength of the at least one element is greater than or equal to 4.5 kg/(m) ³ MPa) and less than or equal to 15 kg/(m) ³ MPa), thereby contributing to a reduction in the weight of the entire power tool. The at least one element is manufactured by an injection molding process such that the shape of the at least one element can be arbitrarily set as desired.

Another embodiment of a long-pole power tool 900b is shown in fig. 8, the long-pole power tool 900b including a connecting-rod assembly 910b, a first front-end device 920b, and a rear-end device 930b. The link assembly 910b includes a first link 911b, a second link 912b, and a connector 913b for connecting the first link 911b to the second link 912 b. In the present embodiment, the first front end device 920b and the first connecting rod 911b constitute a first output device 901b. The rear end device 930b and the second connecting rod 912b form a power head 902b, which power head 902b is a power plant capable of connecting different output devices to achieve different tool functions.

For example, in the present embodiment, the first output device 901b includes a first connecting rod 911b and a first front end device 920b, and the first front end device 920b includes a grass cutting head 921b, so that the first output device 901b can enable the long rod-type power tool 900b to be used as a grass cutting machine when the power head 902b is connected.

It will be appreciated that the long-pole type power tool 900b also includes a second output device 902b, the second output device 902b including a third connecting rod 914b and a second front end device 940b. In this embodiment, the second front-end device 940b includes: chain 941b, guide 942b, and the like. In this way, when the second output device 902b is connected to the power head 902b, the long bar-type power tool 900b can be used as a long bar-type chain saw that can trim branches.

Alternatively, in other embodiments, the pole-type power tool 900b may further include a third output device, and when the third output device is connected to the power head 902b, the pole-type power tool 900b may be used as a pole-type pruner that prunes some larger shrubs.

Specifically, in the present embodiment, the connection member 913b is mounted to the second connection rod 912b, and the connection member 913b is used to connect the first connection rod 911b or the third connection rod 914b to the second connection rod 912b. In other embodiments, the connecting member 913b may be provided on the first connecting rod 911b or the third connecting rod 914 b. The connecting piece 913b is a connecting pipe sleeved on the second connecting rod 912b, and the connecting pipe comprises a carbon fiber composite material. In this way, the structural stability of the connection pipe is stronger and the mass of the connection pipe is also reduced, thereby being more advantageous in reducing the weight of the connection rod assembly 910 b.

In the present embodiment, the density of the connecting members 913b is greater than or equal to 0.9g/cm ³ And less than or equal to 2g/cm ³ The tensile strength of the connecting member 913b is greater than or equal to 100Mpa and less than or equal to 200Mpa.

Alternatively, the ratio of the density of the connecting member 913b to the tensile strength of the connecting member 913b is greater than or equal to 4.5 kg/(m) ³ MPa) and less than or equal to 15 kg/(m) ³ MPa). The density of the connecting members 913b is greater than or equal to 1 g/cm ³ And less than or equal to 1.5g/cm ³ The tensile strength of the connecting member 913b is greater than or equal to 120Mpa and less than or equal to 180Mpa.

The power tool 900c shown in fig. 9 is a mower, which is a hand propelled power tool, with a user standing on the rear side of the mower to hold the mower's handle to push the mower across the ground. The mower comprises: an output assembly 910c, a motor, an energy source device, and a support 920c, the output assembly 910c including a blade for mowing, the motor being capable of driving the blade in rotation to cut vegetation. The energy source device is used for providing energy sources for the motor. In this embodiment, the support 920c is a chassis for supporting the motor or the output assembly 910c, the motor and the output assembly 910c are connected, and the motor and the output assembly 910c are integrally mounted to the chassis. The support 920c is made of the carbon fiber composite material in the embodiment shown in fig. 7, and the parameter characteristics of the support 940a made of the carbon fiber composite material in the embodiment of fig. 7 may also be applied to the support 920c of the present embodiment.

The power tool 900d shown in fig. 10 is a snowplow, which is a hand propelled power tool, with a user standing on the rear side of the snowplow and holding the handle of the snowplow to propel the snowplow over the ground. The snowplow comprises: the output assembly 910d, a motor, an energy source device 920d, and a support 930d, the output assembly 910d including an auger for sweeping snow, the motor being capable of driving the auger in rotation to concentrate the snow. The energy source device 920d is used to provide a source of energy to the motor. In this embodiment, the support 930d is a chassis for supporting the motor or the output assembly 910d, the output assembly 910d being mounted to the chassis. The support 930d is made of a carbon fiber composite material in the embodiment shown in fig. 7. The parameter characteristics of the support 940a made of the carbon fiber composite material in the embodiment of fig. 7 may also be applied to the support 930d of the present embodiment.

The power tool 900e shown in fig. 11 is a vehicle-type power tool that may be a riding lawn mower. The user sits on the seat of the vehicle-type power tool to drive the vehicle-type power tool to walk on the ground. The vehicle-type power tool includes an output assembly 910e, a motor 920e, an energy source device 930e, and a support 940e, the output assembly 910e including a blade for mowing, the motor 920e being capable of driving the blade to rotate to cut vegetation. The energy source device 930e is configured to provide a source of energy to the motor 920 e. In the present embodiment, the supporting member 940e is a chassis for supporting the motor 920e or the output unit 910e, the motor 920e and the output unit 910e are connected, and the motor 920e and the output unit 910e are integrally mounted to the chassis. The support 940e is made of a carbon fiber composite material in the embodiment shown in fig. 7. The parameter characteristics of the support 940a made of the carbon fiber composite material in the embodiment of fig. 7 may also be applied to the support 940e of the present embodiment. Alternatively, the support may be a front end housing 941e mounted to the front end, or may be a rear end housing 942e mounted to the rear end. The front end housing 941e or the rear end housing 942e is made of a carbon fiber composite material. Alternatively, the support may also be a frame 943e for supporting the output assembly 910 e.

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

Claims

1. A pole-type power tool comprising:

a front-end device including an output assembly for outputting power and a front housing supporting the output assembly;

a rear end device including a motor for driving the output assembly and a rear housing supporting the motor;

the connecting rod assembly is used for connecting the front end device and the rear end device;

the connecting rod assembly includes:

the connecting rod is used for connecting the front end shell and the rear end shell;

a drive shaft connecting the motor and the output assembly, the drive shaft for transmitting power between the motor and the output assembly;

the transmission shaft is at least partially arranged in the connecting rod, the extending direction of the transmission shaft is basically the same as that of the connecting rod, the transmission shaft comprises a hollow shaft part, the hollow shaft part comprises a first inner wall defining a first inner hole, the part of the connecting rod for accommodating the hollow shaft part is defined as an accommodating rod, the accommodating rod comprises a second inner wall defining a second inner hole, and the weight of the whole unit length formed by the accommodating rod and the hollow shaft part is greater than or equal to 300g/m and less than or equal to 500g/m.

2. The power tool of claim 1, wherein the weight per unit length of the receiving rod is greater than or equal to 180g/m and less than or equal to 300g/m.

3. The power tool according to claim 1, wherein the hollow shaft portion has a weight per unit length of 100g/m or less and 200g/m or less.

4. The pole-type power tool of claim 1, wherein the receiving pole comprises a carbon fiber material.

5. The power tool of claim 1, wherein the ratio of the hardness of the receiving rod to the weight per unit length of the receiving rod is greater than or equal to 150 (hrc.g)/m and less than or equal to 280 (hrc.g)/m.

6. The power tool of claim 1, wherein the density of the receiving rods is greater than or equal to 1.4g/cm ³ And is smaller than orEqual to 1.8g/cm ³ 。

7. The pole-type power tool of claim 1, wherein the weight of the connecting rod is greater than or equal to 300g and less than or equal to 400g.

8. The long bar-type power tool of claim 1, wherein a ratio of a weight of the connecting rod assembly to a bare metal weight of the long bar-type power tool is greater than or equal to 0.1 and less than or equal to 0.2.

9. The pole-type power tool of claim 1, wherein a ratio of an inner diameter of the first bore to an outer diameter of the hollow shaft portion is greater than or equal to 0.5 and less than or equal to 0.8.

10. The power tool of claim 1, wherein a ratio of a density of the hollow shaft portion to a density of the connecting rod is greater than or equal to 4 and less than or equal to 7.

11. A pole-type power tool comprising:

a connecting rod assembly connecting the front end device and the rear end device;

wherein, the connecting rod assembly includes:

a connecting rod connecting the front housing and the rear housing;

a drive shaft connecting the motor and the output assembly, the drive shaft configured to transfer power between the motor and the output assembly;

the transmission shaft is at least partially arranged in the connecting rod, and the ratio of the total weight of the connecting rod and the transmission shaft to the length of the connecting rod is greater than or equal to 300g/m and less than or equal to 480g/m.

12. A grass trimmer comprising:

the front-end device comprises an output assembly for outputting power and a front shell for supporting the output assembly, and the output assembly comprises a grass cutting head for cutting grass;

wherein, the connecting rod assembly includes:

a connecting rod connecting the front housing and the rear housing;

wherein the transmission shaft is at least partially arranged in the connecting rod, and the ratio of the total weight of the connecting rod assembly and the front end device to the bare metal weight of the grass trimmer is greater than or equal to 0.3 and less than or equal to 0.42.