WO2022134281A1

WO2022134281A1 - Handheld lithium battery garden working head driving device having front motor

Info

Publication number: WO2022134281A1
Application number: PCT/CN2021/075398
Authority: WO
Inventors: 柳金梅; 曹惠昌; 李敏
Original assignee: 绿友机械集团股份有限公司
Priority date: 2020-12-25
Filing date: 2021-02-05
Publication date: 2022-06-30
Also published as: CN112751455A

Abstract

A handheld lithium battery garden working head driving device having a front motor, comprising a lithium battery, a battery shell (1), a control handle (2), a connection rod (3), a brushless motor (4), and a working rod (5). The rear end of the connection rod (3) is sleeved with the control handle (2) and connected to the battery shell (1); a motor controller is mounted in the battery shell (1), and the lithium battery is inserted in the battery shell (1); the brushless motor (4) is connected between the connection rod (3) and the working rod (5); the brushless motor (4) comprises a rear end cover (41) connected to the front end of the connection rod (3), a rotor assembly (42), a stator assembly (44), and a front end cover (43) connected to the rear end of the working rod (5); a rotor body of the brushless motor (4) is connected to a transmission shaft (6); the transmission shaft (6) is located in the working rod (5); and the brushless motor (4) is located at a balance position of the whole machine in a hanging state, i.e., the brushless motor is close to the front end of a lifting handle (7).

Description

Handheld lithium battery garden work head drive device in front of the motor

technical field

The invention belongs to the field of garden machinery, in particular to a hand-held lithium battery garden work head driving device with a front motor.

Background technique

Traditional garden tools are powered by gasoline engines by connecting different working heads to achieve grass cutting, pruning, and hedge trimming. Due to factors such as high cost, high noise, and environmental pollution, they are gradually being replaced by electric motors.

At present, there are two main layout forms of the drive motor for the electric garden tools on the market: one is that the motor is arranged at the front end of the working rod and directly drives the working head. Although this form improves the transmission efficiency, the weight is concentrated on the remote end of the hand-held , increases the holding torque during work, the operator is more laborious, and the comfort is poor, and the dust and moisture in the work will cause motor pollution and easily lead to damage to the motor; the other is that the motor is set at the rear of the machine, Through the transmission shaft, the working head is driven to work. In this way, due to the long distance between the power and the working parts, the vibration is obvious, and the transmission loss is large, which affects the work efficiency, and the rear motor is generally combined with the battery, or plugged in. The battery has a complex structure and a large volume.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hand-held lithium battery garden work head driving device in front of the motor which reduces the holding torque and makes the whole machine have high balance.

To achieve the above object, the present invention adopts the following technical solutions:

A hand-held lithium battery garden work head driving device in front of a motor, comprising a lithium battery, a battery shell, a control handle, a connecting rod, a brushless motor and a working rod, the rear end of the connecting rod is connected with a control handle and a battery shell, the A motor controller is installed in the battery shell and a lithium battery is inserted, the brushless motor is connected between the connecting rod and the working rod, and the brushless motor includes a rear end cover connected with the front end of the connecting rod, a stator assembly, a rotor The assembly and the front end cover connected with the upper rear end of the working rod, the rotor body of the brushless motor is connected with the transmission shaft, the transmission shaft is located in the working rod, and the brushless motor is located at the balance position in the hooked state of the whole machine , that is, close to the front end of the handle.

The brushless motor includes a rear end cover, a rotor assembly, a stator assembly and a front end cover; the rotor assembly includes a rotor, a motor shaft and a bearing, and the stator assembly includes a stator and a middle section of the motor housing, a front end cover and a rear end cover It is not only an integral part of the motor casing but also the bearing seat of the motor shaft bearing.

Preferably, a detachable handle is installed on the rear end cover near the connecting rod.

Preferably, a detachable handle is installed on the connecting rod near the rear end cover.

Preferably, the front end cover and the rear end cover of the brushless motor are respectively sleeved with the working rod and the connecting rod.

Preferably, the circumference of the outer casing of the inner rotor brushless motor is covered with cooling ribs.

Beneficial effects of the present invention: the present invention arranges the motor between the handle and the working head, and is as close to the handle as possible, which can reduce the holding torque and make the whole machine have high balance. At the same time, because the transmission shaft is greatly shortened, the power transmission loss is reduced, and the vibration is reduced. The motor shell is of non-standard structure, the stator is embedded in it, and the exterior is covered with heat dissipation ribs, which meets the functional requirements under the premise of the coordination of the appearance of the whole machine.

Description of drawings

In order to illustrate the embodiments of the present invention more clearly, the embodiments will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of the three-dimensional structure of the present invention.

Fig. 2 is a partial cross-sectional plan structure schematic diagram of the present invention.

3 to 6 are schematic diagrams of the structure of the present invention connecting different working heads.

Detailed ways

The following examples are only used to illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention, and are described together first.

As shown in Figures 1 and 2, it is a hand-held lithium battery garden work head driving device with a front motor of the present invention, including a battery shell 1, a control handle 2, a connecting rod 3, a brushless motor 4 and a working rod 5. The rear end of the connecting rod 3 is connected to the control handle 2, the connecting rod 3 plays the role of connection and wiring, the control handle 2 and the rear part of the connecting rod are connected to the battery case 1, and the battery case 1 is installed with a motor controller, The lithium battery is locked after being inserted from the rear end of the battery case, and can be quickly taken out through the release button; the brushless motor 4 is connected between the connecting rod 3 and the working rod 5, and the brushless motor 4 includes a connection with the front end of the connecting rod The rear end cover 41, the stator assembly 44, the rotor assembly 42, and the front end cover 43 that is quickly plugged with the rear end of the working rod, the rear end cover 41 is fixedly connected with the rear end of the casing of the stator assembly by screws, and the front end cover 43 and the front end of the casing of the stator assembly are fixedly connected by screws, the front end cover, the rear end cover and the corresponding motor shaft are respectively provided with bearings. The shape of the brushless motor is a shuttle shape with two thin ends and a thick middle, and the middle is the stator. The outer casing of the assembly has a front end cover and a rear end cover at both ends; the motor shaft of the brushless motor 4 is plugged or screwed with the transmission shaft 6, the transmission shaft 6 is located in the working rod 5, and the brushless motor is located in the whole. The balance position of the machine in the hooked state, that is, close to the front end of the handle.

The handle 7 is a three-dimensional curved and streamlined design. While the holding distance between its holding point and the rear control handle meets the requirements of use, its fixed fulcrum is as close as possible to the rear end cover of the motor or mounted on the rear end cover. The back-tilted design meets ergonomic requirements.

When the working head for high-altitude work is to be installed, a rubber handle cover 8 can be set on the connecting rod close to the brushless motor, which is convenient for high-altitude work.

The outer casing of the middle section of the motor can be an extruded aluminum part, which is easy to cut into different lengths to meet different motor power requirements. The circumference of the outer casing of the motor is covered with cooling ribs, and the front and rear covers are injection molded parts or die-cast aluminum parts with symmetrical or asymmetrical structures.

As shown in Figure 3, it is the structure of installing the working head of the lawn mower and brush cutter; as shown in Figure 4, it is the structure of installing the extension pole hedge trimmer; as shown in Figure 5, the high branch saw is installed in the present invention As shown in Figure 6, it is the structure of the flexible shaft lawn mower installed in the present invention. Connect different work heads for grass cutting, pruning, hedge trimming and more. The working rod is generally driven by a hard shaft, while for a curved working rod, a flexible shaft is required.

The motor of the present invention is arranged at the front end of the handle and is close to the handle, or the handle is fixed on the rear end cover of the motor, and the motor shaft is inserted or screwed with the transmission shaft in the working rod, so as to transmit the power to the working head; The lithium battery and the controller are integrated into the plastic shell at the end, which balances the weight of the whole machine and reduces the labor intensity of the operator.

Claims

A hand-held lithium battery garden work head driving device with a front motor, which is characterized in that it includes a battery shell, a control handle, a connecting rod, a brushless motor and a working rod, and a control handle is sleeved at the rear end of the connecting rod and is connected to a battery A motor controller is installed in the battery case and a lithium battery is inserted, the brushless motor is connected between the connecting rod and the working rod, and the brushless motor includes a rear end cover connected with the front end of the connecting rod, a rotor The assembly, the stator assembly and the front end cover connected with the rear end of the working rod, the rotor body of the brushless motor is connected with the transmission shaft, the transmission shaft is located in the working rod, and the brushless motor is located in the hanging state of the whole machine. At the balance position, that is, close to the front end of the handle.
The hand-held lithium battery garden work head drive device in front of the motor according to claim 1, wherein the rotor assembly includes a rotor, a motor shaft and a bearing, the stator assembly includes a stator and a middle-section casing of the motor, a front cover and a rear cover The end cover is both an integral part of the motor housing and a bearing seat for the motor shaft bearing.
The hand-held lithium battery garden work head driving device in front of the motor according to claim 1, wherein a detachable handle is installed on the rear end cover close to the connecting rod.
The hand-held lithium battery garden work head driving device in front of the motor according to claim 1, wherein a detachable handle is installed on the connecting rod close to the rear end cover.
The hand-held lithium battery garden work head driving device in front of the motor according to claim 1, wherein the front end cover and the rear end cover of the brushless motor are respectively sleeved with the working rod and the connecting rod.
The hand-held lithium battery garden work head driving device in front of the motor according to claim 1, wherein the circumference of the outer casing of the brushless motor is covered with heat dissipation ribs.