CN215774283U

CN215774283U - Grass cutter

Info

Publication number: CN215774283U
Application number: CN202121098848.4U
Authority: CN
Inventors: 焦石平; 牟国良; 高世林
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2022-02-11
Anticipated expiration: 2031-05-21

Abstract

The utility model relates to a mower, and belongs to garden tools. The mower comprises a main body; the moving assembly drives the main body to move, the moving assembly comprises at least one group of driving wheels arranged on the main body, and each driving wheel comprises a wheel body and a hub motor arranged in the wheel body and used for driving the wheel body to rotate; and a brake assembly disposed between the driving wheel and the main body, configured to lock the driving wheel and the main body to mechanically brake the driving wheel. The utility model provides a lawn mower is through setting up the brake subassembly between drive wheel and main part, and this brake subassembly adopts the mechanical braking drive wheel, compares with prior art, and the brake braking moment of torsion of this application is big, can effectual promotion braking effect, especially when lawn mower parks on the ramp, can prevent effectively during the braking that the drive wheel rotates under the effect of gravity to prevent the lawn mower gliding.

Description

Grass cutter

Technical Field

The utility model relates to a mower, and belongs to garden tools.

Background

Landscaping is now closely related to life, and lawn mowers are increasingly being used to maintain lawns and sports fields. The mower cuts grass on a traveling path through the mowing assembly, the moving assembly is driven by the motor to walk, when the mower is used, the mower needs to stop on a slope, and due to the gravity of the mower, a downward component force is generated, so that the mower slides down along the slope and cannot stand on the slope, and the safety problem is caused.

Lawn mower adopts the control motor short circuit to realize the brake among the prior art usually, specifically is: the three-phase short circuit of the motor is adopted, when the motor cuts off a power supply, the stator winding is in short circuit, and the rotor rotates through inertia. Because the rotor core has residual magnetism, a rotating magnetic field is formed, the magnetic field cuts the stator winding under the action of the rotation inertia of the motor and generates induced electromotive force in the stator winding, and because the stator winding is short-circuited by the break contact of the contactor, induced current exists in the loop of the stator winding, and the current interacts with the rotating magnetic field to generate braking torque to force the motor to stop rotating so as to achieve the purpose of braking. The short-circuit brake has the advantages of no need of special control equipment, simplicity and feasibility, but small brake torque, and the brake time which is only improved by about 1/4 compared with the free brake (the stator winding is not short-circuited), and is suitable for the occasions with small capacity, high speed motors and low brake requirements. Because the braking torque is small, the purpose of braking and stopping can not be realized on a slope with a large gradient.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mower capable of improving safety.

In order to achieve the purpose, the utility model provides the following technical scheme: a lawn mower, comprising:

a main body;

the moving assembly drives the main body to move, and comprises at least one group of driving wheels arranged on the main body, and each driving wheel comprises a wheel body and a hub motor arranged in the wheel body to drive the wheel body to rotate; and the number of the first and second groups,

a brake assembly disposed between the drive wheel and the body configured to lock the drive wheel and the body to mechanically brake the drive wheel.

Further, the brake assembly includes a locking member disposed on the main body, the locking member being configured to move toward the driving wheel under an external force to lock the driving wheel and the main body.

Further, the locking member is configured to move between a locking position and an unlocking position under the action of external force; when the locking member is in the locking position, the locking member applies a force to the drive wheel; when the locking member is in the unlocked position, the force applied by the locking member to the drive wheel is removed.

Further, the in-wheel motor has a rotor, and when the lock is in the lock position, the force of the lock is applied to the rotor.

Further, when the locking piece is located at the locking position, the locking piece abuts against the rotor.

Further, when the lock member is located at the lock position, the lock member is inserted into the rotor to interfere with the rotor in a rotation direction of the rotor.

Furthermore, a plurality of locking grooves for inserting the locking pieces are formed in the side wall of the rotor.

Further, the brake assembly further comprises a driving device for driving the locking piece to move, the driving device comprises a conductive winding and a controller for controlling the conductive winding to be powered on or powered off, and the locking piece comprises an iron core at least partially inserted into the electrical winding.

Further, the brake assembly includes a locking member disposed on the main body, the locking member configured to deform under an external force to lock the driving wheel and the main body.

Further, the brake assembly includes a locking member disposed on the driving wheel, the locking member being deformed or moved toward the main body by an external force to lock the driving wheel and the main body.

The utility model has the beneficial effects that: the utility model provides a lawn mower is through setting up the brake subassembly between drive wheel and main part, and this brake subassembly adopts the mechanical braking drive wheel, compares with prior art, and the brake braking moment of torsion of this application is big, can effectual promotion braking effect, especially when lawn mower parks on the ramp, can provide great braking moment of torsion during the braking to prevent effectively that the drive wheel from rotating under the effect of gravity, in order to prevent the lawn mower gliding.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a portion of a lawn mower according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of the portion shown in FIG. 1;

FIG. 3 is a front view of the portion shown in FIG. 1, with a partial cross-sectional configuration;

FIG. 4 is an enlarged view of the section in FIG. 3;

FIG. 5 is a schematic view of a driving wheel and locking member according to the present application;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5, showing the locking member in a locked position;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 5 with the locking member in the unlocked position;

FIG. 8 is a schematic view of another drive wheel and lock arrangement according to the present application;

fig. 9 is a sectional view taken along line B-B in fig. 8.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1 to 4, a lawn mower according to a preferred embodiment of the present invention includes a main body 10, a mowing assembly (not shown) mounted on the main body 10, a moving assembly 20 for moving the main body 10, and a braking assembly 30 disposed between the moving assembly 20 and the main body 10.

The body 10 is a frame 10, and the body 10 includes a base 11. The mowing assembly is disposed below the main body 10, and specifically, the mowing assembly is fixed on the base 11. The mowing assembly comprises a cutter disc frame, a cutter disc group arranged on the cutter disc frame and a mowing motor arranged on the cutter disc frame and used for driving the cutter disc group to rotate. The structure of the cutter disc frame, the cutter disc group and the mowing motor and the connection mode of the cutter disc group, the cutter disc frame and the frame are the prior art, and the description is omitted.

In this embodiment, the lawn mower is an intelligent lawn mower, and the lawn mower further includes a control device (not shown) disposed in the main body 10, and the control device is configured to control the moving assembly 20 to operate by itself. The control device is of prior art and will not be described in detail here.

The moving assembly 20 includes at least one set of driving wheels 21 mounted on the main body 10, and in detail, in this embodiment, the moving assembly 20 includes at least one set of front wheels and a set of rear wheels located at the front and rear sides, the set of rear wheels 20 are the driving wheels 21, and the front wheels are universal wheels, but of course, in other embodiments, the front wheels may also be provided as the driving wheels 21. The driving wheel 21 includes a wheel body 211 and a hub motor 212 disposed in the wheel body 211 to drive the wheel 21 to rotate. The hub motor 212 has a conventional structure, and the hub motor 212 includes a rotor 213 mounted in the wheel body 211 and a stator 214 disposed in the rotor 213. The stator 214 is fixed to the base 11 of the body 10 by a bracket 215.

The brake assemblies 30 are configured to lock the driving wheels 21 and the main body 10 to mechanically brake the driving wheels 21, in this embodiment, the number of the driving wheels 21 is two, and correspondingly, the brake assemblies 30 are two, and each set of the brake assemblies 30 brakes the corresponding driving wheel 21. Referring to fig. 3 to 6, the brake assembly 30 includes a locking member 31. The locking member 31 is provided on the base 11 of the main body 10, and the locking member 31 is configured to move toward the driving wheel 21 by an external force to lock the driving wheel 21 and the main body 10. Of course, in other embodiments, the locking member 31 may be fixed on the driving wheel 21, and the locking member 31 is configured to move toward the main body 10 under the action of external force to lock the driving wheel 21 and the main body 10. The purpose of locking the drive wheel 21 with the main body 10 is: the driving wheel 21 cannot rotate relative to the main body 10, i.e. the driving wheel 21 is braked.

The locking member 31 is fixed on the main body 10, the locking member 31 includes a fixing seat 32 fixed on the base 11 of the main body 10, and the locking member 31 is movably disposed on the fixing seat 32 and can move relative to the fixing seat 32. The locking member 31 is configured to move between a locked position (see fig. 6) and an unlocked position (see fig. 7) by an external force. When the locking member 31 is located at the locking position, the locking member 31 applies a force to the driving wheel 21 to brake the driving wheel 21; when the locking member 31 is in the unlocking position, the force applied by the locking member 31 on the driving wheel 21 is removed, and the locking member 31 and the driving wheel 21 have a gap (i.e. the locking member 31 is not in contact with the driving wheel 21), at this time, the driving wheel 21 can rotate under the driving of the in-wheel motor 212 inside the driving wheel to realize the movement of the mower.

Since the driving wheel 21 is the in-wheel motor 212, if the driving wheel 21 needs to be braked, it is preferable to directly brake the rotor 213, that is, when the locking member 31 is located at the locking position, the force of the locking member 31 is applied to the rotor 213, specifically, when the locking member 31 is located at the locking position, the locking member 31 abuts against the rotor 213, that is, friction is generated between the locking member 31 and the rotor 213, so as to brake the rotor 213. Of course, in other embodiments, the friction force may be applied to other positions where the in-wheel motor 212 can stop rotating, such as the wheel body 211, but if the friction force is applied to stop rotating the driving wheel 21, the service life of the wheel body 211 will be reduced, and if the friction force is applied to the rotor 213, the rotor 213 and the locking member 31 are generally rigid members to improve the braking performance, so that the service life of the driving wheel 21 will not be affected when the friction force is applied to the wheel body 211.

Since the lawn mower of the present embodiment is an intelligent lawn mower, and the stop and the operation of the intelligent lawn mower are both controlled by a program, the lawn mower further includes a driving device for driving the locking member 31 to move, and as described above, the external force for driving the locking member 31 is the force output by the driving device. Specifically, the driving device includes a conductive winding (not shown) and a controller (not shown) for controlling the conductive winding to be powered on or powered off, and the locking member 31 is an iron core partially inserted into the conductive winding. The conductive winding is arranged in the holder 32 and the controller, which may be a switch, is controlled by a control device. Indeed, the driving device may be other driving members or driving components commonly used in the prior art, such as an electric cylinder, etc., which is not limited in this application.

In this embodiment, the locking member 31 is a straight iron core 31, one end of the iron core 31 is inserted into the conductive winding, and the other end is located outside the iron core 31. In other embodiments, the locking member 31 may be a component formed by combining the material of the core 31 with other materials, such as a portion of the core 31 that can be inserted into an electrical winding, and another portion made of other materials, such as plastic.

In the present embodiment, the locking member 31 and the rotor 213 brake the driving wheel 21 by friction, in other embodiments, see fig. 8 and 9, when the locking member 31 is located at the locking position, the locking member 31 is inserted into the rotor 213 to interfere with the rotor 213 in the rotation direction of the rotor 213, for example, the locking member 31 can be inserted into the rotor 213 to brake the driving wheel 21, specifically: the side wall of the rotor 213 is formed with a plurality of locking grooves 216 into which the locking member 31 is inserted, and when the locking member 31 is inserted into one of the locking grooves 216, the interference of the rotation of the rotor 213 in the rotation direction of the rotor 213 is realized.

In the above embodiments, the driving wheel 21 is braked by the linear movement of the locking member, and in addition, the driving wheel 21 can be braked by rotating the locking member, for example, the locking member is a cam or an eccentric, after the driving device drives the locking member to rotate, the distance between the cam or the eccentric and the driving wheel 21 is changed, and if the cam or the eccentric abuts against the driving wheel 21 (usually, the rotor 213), the driving wheel 21 is braked. In addition, in other embodiments, the locking element may be configured to deform under the action of external force to lock the driving wheel and the main body, if the locking element is a spring, the locking element is disposed on the main body, the driving device drives the spring to deform to change the distance between the spring and the driving wheel 21, and if the spring deforms to abut against the driving wheel 21 (typically, the rotor 213), the driving wheel 21 brakes. The elastic sheet can also be arranged on the driving wheel, and at the moment, the locking piece deforms under the action of external force to lock the driving wheel and the main body. Furthermore, it is also possible to brake the drive wheel 21 by inserting a cam or an eccentric or a spring plate into a groove provided on the drive wheel 21 in correspondence therewith, which is not exemplified here.

Referring to fig. 1 again, in the present embodiment, the lawn mower further includes a battery pack (not shown) installed in the main body 10, and the length of the cable is not limited by the battery pack. The battery pack may be detachably mounted in the main body 10 or may be non-detachably fixed in the main body 10.

The mower further comprises a walking planning system (not shown) arranged on the main body 10, the walking planning system is in signal connection with the control assembly to plan a walking path of the mower, then the control assembly controls the moving assembly 20 to move according to the walking path, and meanwhile, the control assembly controls the mowing assembly to operate to mow. The walking planning system modulates a walking path by adopting a path planning algorithm based on an RTK technology. In other embodiments, the walking planning system may be disposed outside the main body 10 instead of on the main body 10, and the walking planning system realizes signal transmission of the control component by the communication module.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A lawn mower, comprising:

a main body;

2. The lawnmower of claim 1, wherein the brake assembly comprises a locking member disposed on the body, the locking member configured to move in a direction toward the drive wheel under an external force to lock the drive wheel and the body.

3. The mower of claim 2, wherein said lock is configured to move between a locked position and an unlocked position under an external force; when the locking member is in the locking position, the locking member applies a force to the drive wheel; when the locking member is in the unlocked position, the force applied by the locking member to the drive wheel is removed.

4. The mower of claim 3 wherein said in-wheel motor has a rotor and wherein when said lock is in said locked position, a force of said lock is exerted on said rotor.

5. The mower of claim 4 wherein said locking member abuts said rotor when said locking member is in said locked position.

6. The mower of claim 4 wherein when said lock is in said locked position, said lock is inserted into said rotor to interfere with said rotor in a direction of rotation of said rotor.

7. The mower of claim 6, wherein said side wall of said rotor defines a plurality of locking slots for receiving said locking members.

8. A lawnmower as claimed in any one of claims 2 to 7, wherein said brake assembly further comprises drive means for driving movement of said locking member, said drive means comprising an electrically conductive winding and a controller for controlling energisation or de-energisation of said electrically conductive winding, said locking member comprising an iron core at least partially inserted into said electrical winding.

9. The mower of claim 1, wherein the brake assembly comprises a locking member disposed on the main body, the locking member configured to deform under an external force to lock the drive wheel and the main body.

10. The mower of claim 1, wherein said brake assembly includes a locking member disposed on said drive wheel, said locking member being deformable or movable in a direction toward said main body by an external force to lock said drive wheel and said main body.