TW202203743A - Electric string trimmer for enhancing usage safety - Google Patents

Abstract

An electric string trimmer is configured with a DC brushless electric motor, a cutting device and an operating device. A connecting piece is connected to the top of the DC brushless electric motor. The DC brushless electric motor at least comprises an upper cover and a lower cover. A shaft is further fixed on an outer surface of a lower groove of the lower cover. A positioning column penetrated through the upper groove of the upper cover and two bearings respectively disposed on the upper groove and the lower groove are further configured between the upper cover and the lower cover of the DC brushless electric motor, wherein, by the configuration design of stator structure and rotor structure, the rotor structure may drive the shaft of the lower cover for rotating. The operating device is provided with a rod body. A handle and a switch are disposed on the rod body, wherein the switch is electrically connected to the electric motor for achieving the advantage of usage safety enhancement.

Description

electric lawn mower

The present invention relates to an electric lawn mower, in particular to an electric lawn mower with an upper cover and a rotating cover that cover the rotor and rotate together, thereby providing an electric lawn mower with higher use safety.

At present, lawn mowers can be roughly divided into gasoline (diesel) engine lawn mowers and electric lawn mowers. Because gasoline engine lawn mowers are quite noisy during operation, the exhaust gas emitted will cause air pollution, and maintenance is inconvenient. Therefore, although its mowing function is better than that of electric lawn mowers, the general public prefers Choose an electric lawn mower that is easy to maintain, easy to operate and will not cause air pollution. In the future, with the gradual enhancement of the functions of electric lawn mowers and the gradual rise of public awareness of environmental protection, electric gardening tools will occupy a place.

Conventional electric lawn mowers, such as Taiwan Published Patent No. M450969, discloses a direct-drive electric lawn mower. The lawn mower is provided with a driving device, a cutting device and an operating device. The driving device has an external rotation type electric lawn mower. The motor, the outer rotating electric motor is connected with a connecting piece, the outer rotating electric motor is provided with a stator, a base is connected above the stator, a rotor is sleeved on its outer side, a lower cover is connected below the rotor, and a base is arranged inside the base. A rotating shaft, the end of the rotating shaft extends out of the lower cover, the operating device is connected above the connecting piece of the driving device, and has an electrical connector and a switch for being electrically connected to the external rotating electric motor, and the cutting device is connected below the rotating shaft For the end and the lower cover, when the operating device is connected to the power supply and drives the outer-rotating electric motor, the rotor of the outer-rotating electric motor drives the lower cover and the rotating shaft to pivot, and the rotating shaft and the lower cover drive the cutting device to rotate.

However, since the base is provided with a rotating shaft, the base and the lower cover will rotate relative to each other. The stator and the base of the motor are directly fixed on the top or bottom of the carrier, and the rotor, stator and other components are directly exposed, which is easy to damage, reduces the service life, and affects the safety of operation and use.

The purpose of the present invention is to provide an electric lawn mower, which uses a DC brushless electric motor, and whose upper cover and lower cover cover the stator structure and the rotor structure, so that the lower cover can be driven to rotate together, thereby improving the safety of use. Electric lawn mower.

Another object of the present invention is to provide an electric lawn mower, whereby a stator structure and a rotor structure are arranged between the upper cover and the lower cover, and the two are arranged opposite to each other, so that each of the stator structure and each of the rotor structures can be utilized. The attraction of the magnetic field force and the change of the magnetic field can achieve the relative rotation output action, so that it is not easy to generate high-temperature arcs and metal chips during phase commutation, and has less electrical noise, high reliability, long life and easy to speed up.

Another object of the present invention is to provide an electric lawn mower with a design of covering the brushless DC electric motor with a cover, which can effectively protect the motor from normal operation and improve the safety of operation and use.

The electric lawn mower that can achieve the object of the invention, the electric lawn mower at least includes a connecting piece connected to a brushless DC electric motor; wherein the brushless DC electric motor at least includes an upper cover, and one end of the upper cover is provided with an upper cover opening, And the other end is recessed with an upper groove; and a lower cover, a lower cover opening of the lower cover is opposite to the upper cover opening assembled on the upper cover, wherein the lower cover is opposite to the other end of the upper cover is more recessed with a lower cover There is a groove, and a rotating shaft is fixed on the outer surface of the lower groove of the lower cover; wherein, between the upper cover and the lower cover of the brushless DC electric motor, there is further provided an upper cover passing through the upper cover A slotted locating post and two bearings respectively arranged in the upper slot and the lower slot, and the locating post is provided with a stator structure with a plurality of locating hole fixing rings; and the inner ring wall of the lower cover is more fixed A rotor structure is provided, and the rotor structure is relatively sleeved outside the stator structure, so that the rotor structure drives the rotating shaft of the lower cover to pivot; an operating device is provided with a rod body, and one end of the rod body is connected to the DC The connecting piece of the brushless electric motor is provided with an electrical connector at the other end for connecting the power supply, and the rod body is provided with a handle and a switch, so that the electrical connector and the switch are electrically connected in the brushless DC electric motor; and a cutting device, the cutting device is installed on the other end of the brushless DC electric motor opposite to the connecting piece for mowing grass.

In a preferred embodiment of the present invention, the perimeter of the lower notch groove of the lower cover is smaller than the perimeter of the lower cover opening of the lower cover; accordingly, through the design of the lower cover, the bearing, and the lower notch groove, the The lower cover rotates stably and provides the advantage of the power required by the cutting device.

In a preferred embodiment of the present invention, the rotating shaft is further provided with a locking member, and the locking member is fastened to the rotating shaft.

In a preferred embodiment of the present invention, the connector is provided with a cover, and the cover is locked to the upper cover surface of the brushless DC electric motor by a fixing element, so that it is locked to the rod body through the fixing element superior.

In a preferred embodiment of the present invention, one side of the outer cover is connected with a plug-in rod, the end of the plug-in rod is inserted into the rod body of the operating device, and the plug-in rod is locked by the fixing element, so that it can be locked to the rod body.

In a preferred embodiment of the present invention, the cutting device is provided with a cord-turning cutter, and the cord-turning cutter is connected to the rotating shaft and the surface of the lower cover.

In a preferred embodiment of the present invention, the rotating shaft is further provided with a locking member, and the locking member is fastened to the rotating shaft, so that the rotating shaft passes through the rope rotary cutter and is fixed to the locking member.

In a preferred embodiment of the present invention, the cutting device is provided with a blade cutter, and the blade cutter is connected to the rotating shaft and the surface of the lower cover.

In a preferred embodiment of the present invention, the rotating shaft is further provided with a locking member, and the locking member is fastened to the rotating shaft, so that the rotating shaft passes through a gasket, a metal ring, and the blade cutter in sequence. and a fixing piece, so that the blade cutter) is fixed on the rotating shaft of the DC brushless electric motor through the locking member.

In a preferred embodiment of the present invention, the stator structure and the rotor structure rotate relative to each other, so that the rotor structure can drive the lower cover to rotate relative to each other, so that the cutting device and the lower cover rotate together.

Please refer to FIGS. 1 to 5 at the same time, in the first embodiment of the electric lawn mower provided by the present invention, the electric lawn mower 100 is provided with a DC brushless electric motor 11, a cutting device 50 and an operating device 40, Wherein: a connecting piece 12 is connected above the brushless DC electric motor 11 , and the brushless DC electric motor 11 at least includes an upper cover 16 , one end of the upper cover 16 is provided with an upper cover opening 161 , and the other end is recessed with an upper groove 162; and a lower cover 17, a lower cover opening 171 of the lower cover 17 is relatively assembled to the upper cover opening 161 of the upper cover 16, wherein the lower cover 17 is opposite to the other end of the upper cover 16 with a recessed groove. 172, and a rotating shaft 29 is fixed on the outer surface of the lower groove 172 of the lower cover 17; wherein, between the upper cover 16 and the lower cover 17 of the brushless DC electric motor 11 is further provided with a shaft passing through The positioning column 20 of the upper groove 162 of the upper cover 16 and the two bearings 28 respectively disposed in the upper groove 162 and the lower groove 172, and the positioning column 20 is fixed with a plurality of positioning holes 21 with a stator ring. structure 13; and a rotor structure 14 is fixed on the inner ring wall of the lower cover 17, the rotor structure 14 is relatively sleeved outside the stator structure 13, so that the rotor structure 14 drives the rotating shaft 29 of the lower cover 17 Pivoting; the operating device 40 is provided with a rod body 41, one end of the rod body 41 is connected to the connector 12 of the driving device 10, and the other end is provided with an electrical connector 42 for connecting the power supply, and the rod body 41 is provided with a The handle 43 and the switch 44 are electrically connected to the brushless DC electric motor 11 , and the electrical connector 42 and the switch 44 are electrically connected.

Accordingly, in the electric lawn mower 100 provided by the present invention, the upper cover 16 and the lower cover 17 cover the stator structure 13 and the rotor structure 14 by the arrangement design of the stator structure 13 and the rotor structure 14 , so that the stator structure 14 and the rotor are formed. The structure 14 rotates relatively and drives the lower cover 17 to rotate together, so that each of the stator structures 13 and each of the rotor structures 14 can use the attraction of the magnetic field force and the change of the magnetic field to achieve a relative rotation output action, and by having no rotating shaft and also The design of no element extending on the upper cover makes it difficult to generate high-temperature arcs and metal chips during commutation, and has less electrical noise, high reliability, long life and easy to speed up, thereby providing higher safety in use. Electric lawn mower.

In a preferred embodiment of the present invention, the circumference of the lower groove 172 of the lower cover 17 is smaller than the circumference of the lower cover opening 171 of the lower cover 17; The design enables the lower cover to rotate stably and provides the advantage of the power required by the cutting device.

Accordingly, through the change of the magnetic field between the rotor structure 14 and the stator structure 13 , the rotor structure 14 drives the lower cover 17 to rotate relative to the stator structure 13 , and also drives the power connected to the cutting device 50 . The action of mowing.

In a preferred embodiment of the present invention, the rotating shaft 29 is further provided with a locking member 31 , and the locking member 31 is fastened to the rotating shaft 29 .

In a preferred embodiment of the present invention, the connector 12 is provided with a cover 35 , and the cover 35 is locked to the surface of the upper cover 16 of the brushless DC electric motor 11 by a fixing element 36 . In a preferred embodiment of the present invention, a plug rod 37 is connected to one side of the cover 35 , and the end of the plug rod 37 is plugged into the rod body 41 of the operating device 40 and locked by the fixing element 36 on the rod body 41 .

Please refer to FIG. 3 , in a preferred embodiment of the present invention, the cutting device 50 is provided with a rotary cutter 51 , and the rotary cutter 51 is locked and connected to the rotating shaft 29 and the surface of the lower cover 17 . ; Accordingly, the rope rotary cutter 51 is generally made of nylon material, and is cut by high-speed centrifugal force to achieve the effect of cutting grass. In an embodiment of the present invention, the rotating shaft 29 is further provided with a locking member 31, and the locking member 31 is fastened to the rotating shaft 29, so that the rotating shaft 29 passes through the rope rotary cutter 51 and is fixed to the lock Firmware 31.

In a preferred embodiment of the present invention, the stator structure 13 and the rotor structure 14 rotate relative to each other, so that the rotor structure 14 can drive the lower cover 17 to rotate relative to each other, so that the cutting device 50 and the lower cover 17 together turn.

Please refer to FIG. 6 and FIG. 7, the second embodiment of the electric lawn mower provided by the present invention, the electric lawn mower 100 is provided with a DC brushless electric motor 11, a cutting device 50 and an operating device 40, but this The embodiment is different from the embodiment in FIG. 1 in that the cutting device 50 is provided with a blade cutter 52 , and the blade cutter 52 is connected to the rotating shaft 29 and the surface of the lower cover 17 . In a preferred embodiment of the present invention, the rotating shaft 29 is further provided with a locking member 31 , and the locking member 31 is fastened to the rotating shaft 29 so that a gasket 521 and a metal ring 522 are passed through the rotating shaft 29 in sequence. , the blade cutter 52 and a fixing piece 523, so that the blade cutter 52 can be fixed on the shaft 29 of the brushless DC electric motor 11 through the locking member 31; accordingly, the weeding operation can be carried out quickly and stably , and can cut hard or tough plants, which can reduce the number of cuts and save labor compared with the rope rotary cutter.

The electric lawn mower provided by the present invention has the following advantages when compared with the aforementioned cited cases: (1) The upper cover and the lower cover will cover the stator structure and the rotor structure, and drive the lower cover to rotate together, thereby providing an electric lawn mower with higher safety; (2) A stator structure and a rotor structure are arranged between the upper cover and the lower cover, and the two are arranged opposite to each other, so that each of the stator structures and each of the rotor structures can utilize the attraction of the magnetic field force and the change of the magnetic field to achieve relative rotation. The output action makes it difficult to generate high-temperature arcs and metal chips during commutation, and has less electrical noise, high reliability, long life and easy to speed up; and (3) The design of the outer cover of the brushless DC electric motor can effectively protect the normal operation of the motor and improve the safety of operation and use.

The above detailed description is a specific description of a feasible embodiment of the present invention, but this embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the technical spirit of the present invention shall be included in the within the scope of the patent in this case.

100: Electric Lawn Mower 11: DC brushless electric motor 12: Connectors 13: Stator structure 14: Rotor structure 16: upper cover 161: upper cover opening 162: Upper slot 17: Lower cover 171: Lower cover opening 172: Lower slot 20: Positioning post 21: Positioning hole 28: Bearings 29: Spindle 31: Lock firmware 35: cover 36: Fixed element 37: Insertion rod 40: Operating device 41: Rod body 42: Electrical connector 43: Grip pieces 44: switch 50: Cutting device 51: Rope Rotary Cutter 52: Blade Cutter 521: Gasket 522: Metal ring 523: Fixed piece

FIG. 1 is a three-dimensional appearance view of the first preferred embodiment of the present invention; FIG. 2 is an exploded view of a partial three-dimensional appearance of the first preferred embodiment of the present invention; FIG. 3 is a perspective partial exploded view of the brushless DC electric motor according to the first preferred embodiment of the present invention; FIG. 4 is an exploded perspective view of the brushless DC electric motor according to the first preferred embodiment of the present invention; FIG. 5 is a cross-sectional view of the brushless DC electric motor according to the first preferred embodiment of the present invention; FIG. 6 is a three-dimensional external view of the second preferred embodiment of the present invention; and FIG. 7 is a perspective partial exploded view of the second preferred embodiment of the present invention.

100: Electric Lawn Mower

11: DC brushless electric motor

12: Connectors

35: cover

37: Insertion rod

40: Operating device

41: Rod body

42: Electrical connector

43: Grip pieces

44: switch

50: Cutting device

51: Rope Rotary Cutter

Claims (10)

An electric lawn mower, comprising at least: A DC brushless electric motor (11), a connector (12) is connected above the DC brushless electric motor (11); wherein the DC brushless electric motor (11) at least comprises an upper cover (16), the upper cover (16) ) is provided with an upper cover opening (161) at one end, and a recessed upper groove (162) at the other end; and a lower cover (17), a lower cover opening (171) of the lower cover (17) is relatively assembled in the The upper cover opening (161) of the upper cover (16), wherein the lower cover (17) is further recessed with a groove (172) relative to the other end of the upper cover (16), and the lower cover (17) is provided with a recess (172). A rotating shaft (29) is further fixed on the outer surface of the groove (172); wherein, between the upper cover (16) and the lower cover (17) of the brushless DC electric motor (11), a shaft (17) through the The positioning post (20) of the upper recess (162) of the upper cover (16) and two bearings (28) respectively disposed in the upper recess (162) and the lower recess (172), and the positioning post ( 20) A plurality of positioning holes (21) are used to fix the ring with a stator structure (13); and a rotor structure (14) is fixed on the inner ring wall of the lower cover (17), and the rotor structure (14) is The rotating shaft (29) of the lower cover (17) is driven by the rotor structure (14) to pivot relative to the outside of the stator structure (13); An operating device (40) is provided with a rod body (41), one end of the rod body (41) is connected to the connecting member (12) of the DC brushless electric motor (11), and the other end is provided with a power supply for connecting An electrical connector (42) of the device is provided, and a handle (43) and a switch (44) are arranged on the rod body (41), so that the electrical connector (42) and the switch (44) are electrically connected connected to the DC brushless electric motor (11); and A cutting device (50), the cutting device (50) is installed on the other end of the DC brushless electric motor (11) opposite to the connecting piece (12). The electric lawn mower according to claim 1, wherein the circumference of the lower groove (172) of the lower cover (17) is smaller than the circumference of the lower cover opening (171) of the lower cover (17). The electric lawn mower according to claim 1, wherein the rotating shaft (29) is further provided with a locking member (31), and the locking member (31) is fastened to the rotating shaft (29). The electric lawn mower according to claim 1, wherein the connector (12) is provided with a cover (35), and the cover (35) is locked to the brushless DC electric motor (36) by a fixing element (36). 11) on the surface of the upper cover (16). The electric lawn mower according to claim 4, wherein a plug rod (37) is connected to one side of the cover (35), and the end of the plug rod (37) is plugged into the rod of the operating device (40). body (41), and is locked to the rod body (41) by the fixing element (36). The electric lawn mower as claimed in claim 1, wherein the cutting device (50) is provided with a corded rotary cutter (51), and the corded rotary cutter (51) is connected to the rotating shaft (29) and the Lower cover (17) surface. The electric lawn mower according to claim 6, wherein the rotating shaft (29) is further provided with a locking member (31), and the locking member (31) is fastened to the rotating shaft (29), so that the rotating shaft (29) The rope rotary cutter (51) is passed through and fixed to the locking member (31). The electric lawn mower according to claim 1, wherein the cutting device (50) is provided with a blade cutter (52), and the blade cutter (52) is connected to the rotating shaft (29) and the lower cover (17) SURFACE. The electric lawn mower as claimed in claim 8, wherein the rotating shaft (29) is further provided with a locking member (31), and the locking member (31) is fastened to the rotating shaft (29), so that the rotating shaft (29) A washer (521), a metal ring (522), the blade cutter (52) and a fixing piece (523) are passed through in sequence, so that the blade cutter (52) passes through the locking member (31) The shaft (29) is fixed on the brushless DC electric motor (11). The electric lawn mower according to claim 1, wherein the stator structure (13) and the rotor structure (14) rotate relatively, so that the rotor structure (14) can drive the lower cover (17) to rotate relatively, The cutting device (50) is rotated together with the lower cover (17).

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