WO2023202707A1 - 打草机 - Google Patents

打草机 Download PDF

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Publication number
WO2023202707A1
WO2023202707A1 PCT/CN2023/089827 CN2023089827W WO2023202707A1 WO 2023202707 A1 WO2023202707 A1 WO 2023202707A1 CN 2023089827 W CN2023089827 W CN 2023089827W WO 2023202707 A1 WO2023202707 A1 WO 2023202707A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
motor
gap
end cover
axial
Prior art date
Application number
PCT/CN2023/089827
Other languages
English (en)
French (fr)
Inventor
张煜
乔勇
李辉
Original Assignee
苏州宝时得电动工具有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 苏州宝时得电动工具有限公司 filed Critical 苏州宝时得电动工具有限公司
Publication of WO2023202707A1 publication Critical patent/WO2023202707A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/835—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes
    • A01D34/90—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator
    • A01D34/905—Vibration dampening means
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/74—Cutting-height adjustment
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/76—Driving mechanisms for the cutters
    • A01D34/78—Driving mechanisms for the cutters electric
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/835—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes
    • A01D34/90—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator

Definitions

  • the invention relates to the technical field of garden equipment, and in particular to a lawnmower.
  • the motor drives the mowing head to rotate to realize the mowing function.
  • the motor and the mowing head are connected together. Due to the uneven mass distribution of the trimming head, an unbalanced force will be generated when the trimming head rotates. This unbalanced force will cause vibration when the trimming head rotates, which will then be transmitted to the motor to drive the motor to vibrate, further causing The gripping part of the lawn mower is numb and vibrates, which affects the user experience.
  • the object of the present invention is to provide a lawnmower that reduces hand-numbing vibration.
  • a cutting device includes a cutting element and a power head that drives the cutting element.
  • the power head also includes:
  • a housing a housing; an end cover connected to the housing, and the housing and the end cover define a receiving cavity; a motor, at least partially received in the receiving cavity, and the motor is connected to the cutting element through an output shaft connected; a limiting structure, through which the motor, the housing and the end cover are relatively fixed in the circumferential direction; in the axial and radial directions, the motor and the A gap is provided between the housings so that when the motor drives the cutting element to rotate, the motor and the housing move relative to each other in the axial direction and the radial direction.
  • the width of the gap between the motor and the housing in the axial direction ranges from 0.15 mm to 1 mm.
  • the width of the gap between the motor and the housing in the radial direction ranges from 0.2 mm to 0.8 mm.
  • the motor moves with the rotation of the cutting element so that the rotation axis of the output shaft is collinear with the rotation center line of the cutting element.
  • the rotation axis of the output shaft when the motor is working and the rotation axis of the output shaft when the motor is not working form an acute angle, and the range of the acute angle is 0.4°- 2°.
  • the gaps between the motor and the housing in the axial direction and the radial direction are larger than when the motor drives the cutting element to rotate. Amplitudes in the axial direction and the radial direction.
  • the motor is an external rotor motor, including a stator, a rotor located outside the stator, and a stator bracket supporting the stator, and the gap is provided between the stator bracket and the housing. .
  • the limiting structure includes a notch and a bump matching the notch.
  • the notch and the bump are respectively provided on the housing and the stator bracket. In the circumferential direction, the The side wall of the protrusion abuts the groove wall of the notch.
  • the limiting structure includes screws, through holes and screw holes matching the screws.
  • the through holes are provided on the stator bracket, and the screw holes are respectively provided on the housing and the stator bracket.
  • the end cover wherein the screws are inserted into the screw holes and through holes to fixedly connect the end cover to the housing, and in the circumferential direction, both sides of the screws Butt against the hole wall of the through hole.
  • the cutting device is a lawnmower, and the cutting element is a lawnmower.
  • a lawn mower includes a mowing head and a power head that drives the mowing head to rotate.
  • the power head also includes: a casing, the casing including an open end; and an end cover connected to the open end of the casing. The ends are connected, and the housing and the end cover define a receiving cavity; the motor is at least partially received in the receiving cavity, the motor includes an output shaft, a rotor assembly and a stator assembly, and the output shaft extends along the axial direction and is dynamically connected to the mowing head; there is an axial preset gap and a radial preset gap between the motor and the housing, or there is an axial preset gap between the motor and the end cover. A gap and a radial preset gap are provided.
  • the axial preset gap and the radial preset gap can provide movement space, so that the motor can move relative to the mowing head.
  • the housing and/or the end cover move relative to each other in the axial direction and the radial direction.
  • the stator assembly includes a stator and a stator bracket that supports the stator, and the axial preset gap and the radial preset gap are provided between the stator bracket and the housing. ; Alternatively, the axial preset gap and the radial preset gap are provided between the stator bracket and the end cover.
  • the axial preset gap is 0.15mm-3mm.
  • the radial preset gap is 0.1mm-1mm.
  • the stator bracket includes: a mating side wall for covering the open end of the housing; a flange surface forming a step shape with the mating side wall, and the open end Set on the mating side wall, the radial preset gap is provided between the housing and the mating side wall, and the axial preset gap is provided between the open end and the flange surface between.
  • the output shaft when the motor drives the trimming head to rotate, the output shaft rotates around the first central axis.
  • the output shaft rotates.
  • the output shaft has a second central axis, the first central axis and the second central axis form an acute angle, and the acute angle ranges from 0.4° to 3°.
  • the motor is an external rotor motor
  • a first gap is provided in the axial direction between the top wall of the rotor of the motor and the housing, and the first gap is 1.5 mm to 10 mm
  • a second gap is provided in the radial direction between the side wall of the rotor of the motor and the inner wall of the housing, and the second gap is 3 mm to 10 mm.
  • the power head further includes: a first vibration-absorbing pad disposed between the motor and the end cover for reducing vibration transmission between the motor and the end cover. .
  • the stator assembly of the motor includes a stator bracket, the bottom of the stator bracket is provided with a downwardly extending protrusion, the protrusion is used to install a bearing, and the output shaft extends out of the Protruding portion; the end cap is provided with an end cap groove for mating with the protruding portion, and the bottom of the end cap groove is provided with an opening for the output shaft to pass through; the first vibration damper A pad is disposed between the protrusion and the end cap groove both axially and radially.
  • the stator assembly includes a stator bracket;
  • the power head further includes: a notch provided on the housing, and a bump provided on the stator bracket, in the circumferential direction On the top, the bump can abut against the groove wall of the notch to circumferentially limit the stator assembly; a plurality of assembly parts are distributed circumferentially around the edge of the open end, and the end cover and the The assembly part is fastened with fasteners to limit the motor's axial position.
  • a plurality of mounting parts are circumferentially distributed around the edge of the open end, and the mounting parts are provided with fastening holes; a plurality of mating holes are circumferentially distributed around the edge of the stator bracket; the end
  • the cover includes: a sink groove for mating with the open end of the housing; a plurality of sleeves circumferentially distributed at the bottom of the sink groove and facing the housing, the sleeves extending upward through the stator The mating hole of the bracket; the fastener passes through the fastening hole to perform axial fastening connection with the sleeve.
  • the power head further includes a radial preset gap provided between the outer side wall of the sleeve and the mating hole.
  • the power head further includes: a second vibration-absorbing pad disposed between the fastening hole and the fastener in the housing, and the assembly part and the sleeve. between tubes.
  • the end cap includes: an annular fastening seat, the central area of the fastening seat is axially penetrated; a stop structure is located at the bottom of the axially penetrated area, and the fastening seat is The retaining seat and the stop structure constitute the sinking groove, and a plurality of sleeves are circumferentially distributed on the edge of the stop structure.
  • a lawn mower includes a mowing head and a power head that drives the mowing head to rotate.
  • the power head also includes: a casing, and the casing includes an open end; an end cover, and all parts of the casing. The open end is connected, and the housing and the end cover define a receiving cavity; the motor is at least partially received in the receiving cavity, the motor includes an output shaft, a rotor assembly and a stator assembly, and the stator assembly includes a stator bracket.
  • the output shaft extends along the axial direction and is dynamically connected to the mowing head; it is characterized in that when the motor drives the mowing head to rotate, the outermost edge of the stator bracket is in contact with the housing. And/or there is basically no direct contact between the end covers, so that the motor can move relative to the housing and/or the end covers in the axial direction and the radial direction.
  • the output shaft when the motor drives the trimming head to rotate, the output shaft rotates around the first central axis.
  • the output shaft rotates.
  • the output shaft has a second central axis, the first central axis and the second central axis form an acute angle, and the acute angle ranges from 0.4° to 3°.
  • the motor is an external rotor motor
  • a first gap is provided in the axial direction between the top wall of the rotor of the motor and the housing, and the first gap is 1.5 mm to 10 mm
  • a second gap is provided in the radial direction between the side wall of the rotor of the motor and the inner wall of the housing, and the second gap is 3 mm to 10 mm.
  • an axial preset gap and a radial preset gap are provided between the outermost edge of the stator bracket and the housing; or, the outermost edge of the stator bracket and the end There is an axial preset gap and a radial preset gap between the covers; or, there is an axial preset gap and a radial preset gap between the outermost edge of the stator bracket, the housing and the end cover. Set a gap.
  • the power head further includes: a deformation body disposed between the outermost edge of the stator bracket and the housing and/or the end cover, so that the outermost edge of the stator bracket There is essentially no direct contact between the rim and the housing and/or the end cap.
  • the power head further includes: the deformation body is disposed between the outermost edge of the stator bracket and the axial and radial directions of the housing, or is disposed on the stator bracket. Between the outermost edge and the end cover in the axial and radial directions, or at the same time, it is provided between the outermost edge of the stator bracket and the housing and the axial sum of the outermost edge of the stator bracket and the end cover. between radials.
  • the lawn mower of the present invention includes a housing with an open end and an end cover connected to the open end of the housing.
  • the housing and the end cover define a receiving cavity, and the motor at least It is partially received in the receiving cavity, and the axial preset gap and the radial preset gap are set between the motor and the housing, or between the motor and the end cover, when the motor drives the mowing head to rotate , the axial preset clearance and the radial preset clearance can provide movement space to realize relative movement of the motor relative to the housing and/or the end cover in the axial direction and the radial direction, that is to say, the axial preset clearance
  • the clearance and radial preset clearance reserve enough space margin for the shaking of the motor itself, reducing the vibration transmitted from the motor to the housing, thereby achieving vibration reduction of the lawn mower and reducing the numbness in the user's hand.
  • Figure 1 is a schematic diagram of the head of a lawnmower according to the present invention.
  • Figure 2 is an exploded view of the power head of the lawn mower of the present invention from one perspective;
  • Figure 3 is an exploded view of the power head of the lawn mower of the present invention from another perspective;
  • Figure 4 is a schematic isometric view of the end cover of the lawn mower of the present invention.
  • Figure 5 is a sectional view of the head of the lawn mower according to the first embodiment of the present invention.
  • Figure 6 is a partial enlarged view of position A in Figure 4.
  • Figure 7 is a schematic structural diagram of the first vibration-absorbing pad of the head of the lawn mower of the present invention.
  • Figure 8 is a schematic diagram of the shaking state of the lawnmower according to the present invention.
  • Figure 9 is a cross-sectional view of the head of a lawn mower according to a second embodiment of the present invention.
  • Figure 10 is a partial enlarged view of B in Figure 9;
  • Figure 11 is a schematic structural diagram of the second vibration-absorbing pad in the second embodiment of the lawn mower of the present invention.
  • Figure 12 is a cross-sectional view of the head of a lawnmower according to the third embodiment of the present invention.
  • Figure 13 is a cross-sectional view of the head of the lawn mower according to the third embodiment of the present invention in another state;
  • Figure 14 is a cross-sectional view of another cross-sectional view of a deformed body of the head of the lawn mower according to the third embodiment of the present invention.
  • the cutting device uses a lawn mower to achieve distance, but the cutting device is not limited to a lawn mower, and may also include a brush cutter, a chain saw, a swing machine, etc.
  • the lawn mower includes a mowing head 100 that acts on the object to be cut and a power head 200 that drives the mowing head 100 .
  • the trimming head includes: a reel provided with a trimming rope for winding.
  • the power head 200 also includes: a housing 210 including an open end 2111; an end cover 230 connected to the open end 2111 of the housing 210; the housing 210 and the end cover 230 define a receiving cavity 211; a motor 220, at least partially Received in the receiving cavity 211, the motor 220 includes an output shaft 221, a rotor assembly and a stator assembly 223.
  • the output shaft 221 extends along the axial direction and is dynamically connected to the mowing head.
  • the stator assembly 223 includes a stator bracket 225, and the output shaft 221 extends along the axis. Extends in the direction and is dynamically connected to the mowing head; when the motor 220 drives the mowing head to rotate, there is basically no direct contact between the outermost edge of the stator bracket 225 and the housing 210 and/or the end cover 230, so that the motor 220 can be relatively opposite to each other. Relative movement occurs between the housing 210 and/or the end cover 230 in the axial direction and the radial direction.
  • the vibration generated by the trimming head 100 drives the motor 220 to vibrate, and the amplitude of the end of the motor 220 away from the trimming head 100 is greater than the amplitude of the end of the motor 220 close to the trimming head 100 .
  • the second gap between the motor 220 and the housing 210 gradually becomes wider to accommodate different radial amplitudes at various places on the shaft of the motor 220 without affecting the motor 220 In the case of structural strength, collision with the shell 222 is reduced.
  • the output shaft 221 rotates around the first central axis 2211 (as shown in FIG. 8 ).
  • the output shaft 221 rotates.
  • the shaft 221 has a second central axis 231 (as shown in Figure 8).
  • the first central axis 2211 and the second central axis 231 form an acute angle, that is, the angle at which the output shaft 221 deflects due to shaking, and the range of the acute angle is is 0.4°-3°.
  • the output shaft 221 of the motor 220 produces shaking at the above-mentioned angle. The shaking occurs as the trimming head 100 rotates.
  • the included angle may be 0.4°, 0.6°, 1.8° or 2°, etc.
  • the included angle is 0.6°.
  • a first gap is provided in the axial direction between the top wall of the rotor 224 of the motor 220 and the housing 210, and the first gap is 1.5 mm to 10 mm. If the first gap is too large, the size of the housing 210 will be too large if the size of the motor 220 remains unchanged, resulting in a waste of material of the housing 210 .
  • the first gap is too small, when the motor 220 drives the trimming head to rotate and the motor 220 vibrates due to uneven mass distribution of the trimming head, the top wall of the rotor 224 and the top wall of the housing 210 will come into contact, causing the The vibration of the motor 220 is transmitted to the housing 210 and then to the human hand through the connecting rod, resulting in a bad numbness experience.
  • the first gaps are 1.6mm, 2mm, and 2.5mm.
  • a second gap is provided in the radial direction between the side wall of the rotor 224 of the motor 220 and the inner wall of the housing 210, and the second gap is 3 mm to 10 mm. If the second gap is too large, the size of the housing 210 will be too large if the size of the motor 220 remains unchanged, resulting in a waste of material of the housing 210 .
  • the second gap is too small, when the motor 220 drives the trimming head to rotate and the motor 220 vibrates due to uneven mass distribution of the trimming head, the side wall of the rotor 224 and the side wall of the housing 210 will come into contact, causing the The vibration of the motor 220 is transmitted to the housing 210 and then to the human hand through the connecting rod, resulting in a bad numbness experience.
  • the second gaps are 3mm, 3.2mm, and 4.5mm. It should be noted that the second gap is a single-sided gap in the radial direction between the side wall of the rotor 224 of the motor 220 and the inner wall of the housing 210 .
  • FIGS. 1 to 8 a schematic structural diagram of a first embodiment of a lawn trimmer is shown.
  • the axial preset gap 241 and the radial preset gap 242 can provide movement space to realize the movement of the motor 220 in the axial direction D relative to the housing 210 and/or the end cover 230 (as shown in Figure 2 Relative motion occurs in the radial direction L (shown in Figure 2) and the radial direction L (shown in Figure 2).
  • the axial preset gap 241 and the radial preset gap 242 of the lawnmower provided by the present invention are set between the motor 220 and the housing 210, or between the motor 220 and the end cover 230.
  • the axial preset gap 241 and the radial preset gap 242 can provide movement space, allowing the motor 220 to move relative to the housing 210 and/or the end cover 230 in the axial direction and the radial direction, and also That is to say, the axial preset gap 241 and the radial preset gap 242 reserve enough space margin for the shaking of the motor 220 itself, reducing the vibration transmitted from the motor 220 to the casing 210, thereby achieving vibration reduction of the lawn mower and reducing vibration. Numb feeling to the user's hand.
  • the housing 210 includes an open end 2111.
  • the open end 2111 can be formed by opening one end of the housing 210 instead of closing it.
  • a plurality of mounting portions 2112 are distributed at equal angles around the edge of the open end 2111 of the housing 210.
  • the mounting portions 2112 and the open end 2111 are integrally formed.
  • the mounting portions 2112 extend radially outward from the outside of the housing 210. protrude, install
  • the fitting portion 2112 is provided with a fastening hole 254 extending generally in a direction parallel to the pivot axis (direction of the output shaft 221 ).
  • the fastening hole 254 is a through hole.
  • the motor 220 is connected to the trimming head and drives the trimming head 100 to cut the object to be cut.
  • the type of motor 220 is an external rotor motor 220.
  • the motor 220 includes an output shaft 221, a rotor assembly 224 (shown in Figure 5) and a stator assembly 223 (shown in Figure 5).
  • the output shaft 221 of the motor 220 is connected to the mowing head 100.
  • the bottom of the output shaft 221 is provided with threads connected to the mowing head.
  • the rotor assembly 224 is fixedly connected to the output shaft 221.
  • the rotor assembly includes: rotor sleeve (not marked in the figure) and magnetic parts (not marked in the figure).
  • the rotor sleeve is a hollow cylinder inside.
  • the magnetic components include multiple magnetic components, and the multiple magnetic components are evenly arranged in the circumferential direction on the inner wall of the rotor sleeve.
  • the rotor assembly may also include a rotor cover (not shown in the figure) for closing the rotor sleeve. It is understandable that the rotor sleeve and the rotor cover may also be integrally formed.
  • the stator assembly 223 is partially accommodated in the rotor sleeve, and includes: a stator bracket 225, a stator core and a coil assembly.
  • the stator core is fixed on the stator bracket 225, and the coil assembly is wound around the stator core.
  • the stator bracket 225 includes a bracket part, one end of the bracket part is inserted into the stator core and is fixedly connected to the stator core.
  • the stator bracket 225 also includes: a matching side wall 2251 (shown in Figure 6), used to cover the open end 2111 of the housing 210; a flange surface 2252 (shown in Figure 6), and a matching side wall 2251 (shown in Figure 6).
  • the side wall 2251 forms a step shape, the open end 2111 is sleeved on the mating side wall 2251, the radial preset gap 242 is provided between the housing 210 and the mating side wall 2251, and the axial preset gap 241 is provided between the open end 2111 and the mating side wall 2251. between flange surfaces 2252.
  • the bottom of the stator bracket 225 is provided with a downwardly extending protruding portion 226 (as shown in FIG. 6 ), and the output shaft 221 extends out of the protruding portion 226 .
  • the protrusion 226 provides a bearing cavity for housing the bearing.
  • the end cap 230 is installed at the open end 2111.
  • the end cap 230 is fixedly connected to the housing 210 to close the housing 210 to form the receiving cavity 211.
  • the end cover 230 is provided with a sinking groove 231 for mating with the open end 2111 of the housing 210.
  • the sinking groove is used to accommodate the stator bracket 225.
  • the sinking groove 231 is provided with a periphery corresponding to the assembly portion 2112. The threaded hole, the mounting part 2112 of the housing 210 and the threaded hole are threadedly connected through the fastener 253.
  • the end cover 230 is provided with an end cover groove 232 for cooperating with the protruding portion 226, and the bottom of the end cover groove 232 is provided with an opening for the output shaft 221 to pass through.
  • end cover groove 232 is located at the center of the sinking groove 231 .
  • the motor 220 is accommodated or at least partially accommodated in the accommodation cavity 211 , and the end cover 230 and the assembly portion 2112 are tightly connected through fasteners 253 to axially limit the motor 220 .
  • the motor 220 is prevented from being separated from the housing 210 .
  • the output shaft 221 of the motor 220 can extend out of the receiving cavity 211 through the end cover groove 232 on the end cover 230, and then be connected to the trimming head 100.
  • the motor 220 is completely contained in the receiving cavity 211 and can be connected to the trimming head 100 through another transmission shaft. The motor 220 drives the trimming head 100 through the transmission shaft.
  • the power head 200 also includes: a first vibration damping pad 260 is disposed between the motor 220 and the end cover 230 in both the axial and radial directions, for reducing vibration transmission between the motor 220 and the end cover 230 .
  • the first shock absorbing pad 260 is disposed between the protruding portion 226 and the end cover groove 232 , and the first shock absorbing pad 260 is also extended to the top edge of the end cover groove 232 .
  • the first vibration-absorbing pad 260 includes: a first annular portion 2601 (as shown in FIG. 7 ), a first annular portion 2601
  • the outer periphery of the annular peripheral wall 260 (shown in FIG. 7 ) 2 extends upward, and the second annular portion 2603 (shown in FIG. 7 ) extends outward from the annular peripheral wall 2602 .
  • the annular peripheral wall 2602 is axially located between the protruding portion 226 and the bottom surface of the end cap groove 232, and the annular peripheral wall 2602 is located radially between the protruding portion 226 and the side wall of the end cap groove 232.
  • the second annular portion 2603 extends on The edge of the top of the end cap groove 232.
  • the power head 200 also includes a limiting structure 250 (as shown in FIG. 2 ), which is used to relatively fix the motor 220 and the housing 210 in the circumferential direction, so that the motor 220 can only generate a certain amplitude in the axial and radial directions. vibration.
  • a limiting structure 250 as shown in FIG. 2 , which is used to relatively fix the motor 220 and the housing 210 in the circumferential direction, so that the motor 220 can only generate a certain amplitude in the axial and radial directions. vibration.
  • the limiting structure 250 includes: a notch 251 (shown in Figure 2) provided on the housing 210, and a bump 252 (shown in Figure 2) provided on the stator bracket 225, in the circumferential direction. In the direction, the protrusion 252 can abut against the groove wall of the notch 251 for circumferentially limiting the stator assembly 223 .
  • the bumps 252 are provided on the outer side of the stator bracket 225 in the circumferential direction of the motor 220 .
  • the notch 251 is provided on the housing 210 at the corresponding position of the bump 252, so that the notch 251 and the bump 252 cooperate with each other when the housing 210 and the stator bracket 225 are assembled.
  • the notch 251 may be formed by cutting off part of the wall surface of the housing 210 , or may be added to the outside of the housing 210 .
  • the number of the above-mentioned bumps 252 and notches 251 may be one, two, three or other multiples, and is not limited here.
  • the same notch 251 can also be provided with one or two matching bumps 252.
  • the two outer side walls of the bump 252 in the circumferential direction of the motor 220 are respectively in contact with the notch.
  • the two inner walls of 251 in the circumferential direction of the motor 220 abut against each other; when a notch 251 is provided with two bumps 252 corresponding to each other, the two bumps 252 are spaced apart and each has an outer side wall that abuts the different inner walls of the notch 251 . top.
  • the extension direction of the output shaft 221 of the motor 220 is the axial direction D
  • the direction of circular rotation around the outer circumference of the motor 220 is the circumferential direction.
  • W the direction perpendicular to the axial direction D is the radial direction L.
  • An axial preset gap 241 (shown in FIG. 6 ) and a radial preset gap 242 (shown in FIG. 6 ) are provided between the stator bracket 225 and the housing 210 or the end cover 230 .
  • the axial preset gap 241 refers to the gap between the open end 2111 and the flange surface 2252
  • the radial preset gap 242 refers to the gap between the housing 210 and the mating side wall 2251
  • the gap 242 is not a tolerance gap left for assembly, but a gap specially reserved to allow the motor 220 to move relative to the housing 210 in the axial and radial directions when the motor 220 is working.
  • the reserved gap is larger than the gap of the motor 220.
  • the amount of shaking prevents the motor 220 from contacting the housing 210, and the vibration of the motor 220 during the shaking process is not easily transmitted to the housing 210, thereby improving the holding experience of the lawn mower.
  • the axial preset gap 241 and the radial preset gap 242 can be determined according to the vibration amplitude of the motor in the axial direction and the radial direction when the motor 220 drives the trimming head 100 to rotate. The greater the amplitude of the motor 220 in the axial direction or the radial direction, the greater the corresponding preset gap. In one embodiment, in order to ensure that the motor 220 does not collide with the housing 210 or the end cover and transmit vibration, the axial preset gap 241 and the radial preset gap 242 are both larger than the axial and radial directions of the motor 220 respectively. amplitude in the direction.
  • the preset axial gap 241 (as shown in Figure 6) between the motor 220 and the housing 210 is 0.15mm-3mm.
  • the gap between the motor and the housing in the axial direction is 0.15mm-3mm.
  • the range is 0.15mm-1mm.
  • the axial preset gap 241 is provided between the open end 2111 and the flange surface 2252. If the preset axial gap 241 between the motor 220 and the housing 210 is too large, the axial size of the housing 210 will be too large. The preset axial gap 241 between the motor 220 and the housing 210 is too small. When the motor 220 drives the trimming head to rotate, the motor 220 vibrates due to uneven mass distribution of the trimming head.
  • the steps of the stator bracket 225 The surface will come into contact with the open end 2111 of the housing 210, which will transmit the vibration of the motor 220 to the housing 210 and then to the human hand, resulting in a bad numbness experience.
  • the axial preset gap 241 can be 0.15mm, 0.2mm, 0.95mm, 1mm, 2mm, 2.5mm, etc., preferably 0.2mm.
  • the preset radial gap 242 (as shown in Figure 6) between the motor 220 and the housing 210 is 0.1mm-1m.
  • the gap between the motor and the housing in the radial direction is 0.1mm-1m.
  • the range is 0.2mm-0.8mm.
  • the radial predetermined gap 242 is provided between the housing 210 and the mating side wall 2251. If the preset radial gap 242 between the motor 220 and the housing 210 is too large, and the corresponding preset radial gap 242 between the stator bracket 225 and the inner wall of the housing 210 is large, the motor 220 will be subject to a sudden impact when it is working. When the motor sways excessively in the radial direction inside the casing.
  • the preset radial gap 242 between the motor 220 and the housing 210 is too small.
  • the motor 220 drives the mowing head to rotate, the motor 220 vibrates due to the uneven mass distribution of the mowing head.
  • the coordination of the stator bracket 225 The side wall 2251 will contact the inner wall of the housing 210, which will transmit the vibration of the motor 220 to the housing 210 and then to the human hand, resulting in a bad numbness experience.
  • the gap width between the motor 220 and the housing 210 in the radial direction can be 0.2mm, 0.5mm, 0.8mm or 0.9mm, etc., preferably 0.5mm.
  • the radial preset gap 242 between the housing 210 and the mating side wall 2251 refers to a single-sided gap.
  • an axial preset gap 245 is also provided between the stator bracket 225 and the end cover 230 (as shown in FIG. 6 ).
  • the end cover 230 is provided with a sinking groove 231 opposite the open end 2111.
  • the axial preset gap 245 between the stator bracket 225 and the end cover 230 refers to the axis between the stator bracket 225 and the sinking groove 231.
  • the clearance is specifically 0.15mm-3mm. If the preset axial gap 245 between the stator bracket 225 and the end cover 230 is too large, the axial size of the power head 200 will be too large.
  • the axial preset gap 245 between the stator bracket 225 and the end cover 230 is too small, when the motor 220 drives the trimming head to rotate and the motor 220 vibrates due to uneven mass distribution of the trimming head, the stator bracket 225 Contact with the end cover 230 will transmit the vibration of the motor 220 to the housing 210 and then to the human hand through the connecting rod, resulting in a bad numbness experience.
  • the axial preset gap 245 may be 0.15mm, 0.2mm, 0.95mm, 1mm, 2mm, 2.5mm, etc., preferably 0.2mm.
  • the flange of the stator bracket 225 is smaller than the axial dimension D2 from the end surface of the open end 2111 to the bottom surface of the sinking groove 231 of the end cover 230 (as shown in FIG. 6 ).
  • a radial preset gap 246 is also provided between the stator bracket 225 and the end cover 230 (as shown in FIG. 6 ).
  • the radial predetermined gap 246 is located between the radially outermost side wall of the stator bracket 225 and the sleeve 2302 of the end cover 230 .
  • the radial preset gap 246 is between 0.1 mm and 3 m. For example: 0.2mm, 1mm, 2mm, etc., preferably 2mm.
  • the axial preset gap and the radial preset gap are set between the stator bracket and the housing, they are also set between the stator bracket and the end cover. In other embodiments, the axial preset gap and the radial preset gap may also be provided only between the stator bracket and the housing, or only between the stator bracket and the end cover.
  • embodiments of the present application also provide a second embodiment of a lawn trimmer.
  • a plurality of mounting parts 2112 are circumferentially distributed around the edge of the open end 2111 of the housing 210 , and the mounting parts 2112 are provided with fastening holes 254 ; a plurality of mating holes are circumferentially distributed around the edge of the stator bracket 225 2251 (as shown in Figure 10), the mating hole 2251 corresponds to the fastening hole 254; the end cover 280 includes: a sinking groove 231 for mating with the open end 2111 of the housing 210; a plurality of sleeves 2302 (as shown in Figure 10 shown), is circumferentially distributed at the bottom of the sinking groove 231 and faces the housing 210.
  • the sleeve 2302 extends upward and penetrates the mating hole 2251 of the stator bracket 225; the fastener 253 passes through the fastening hole 254 and the sleeve 2302 for shaft connection. Towards a tight connection.
  • the fastener 253 is a screw, and the sleeve 2302 is provided with an internal thread 255 (as shown in Figure 4).
  • the fastener 253 penetrates the fastening hole 254 of the assembly part 2112 and threadably matches with the internal thread 255 of the sleeve 2302 to achieve an axial fixed connection between the housing 210 and the end cover 280 .
  • the top of the fastening hole 254 is provided with a first countersunk hole (not marked in the figure), the bottom of the fastening hole 254 is provided with a second countersunk hole, and the fastening hole 254 is provided through the first countersunk hole. and between the second countersunk hole.
  • the sleeve 2302 penetrates the mating hole 2251 of the stator bracket 225, and the sleeve 2302 is tightly connected to the fastener 253 that penetrates the fastening hole, so that when the motor 220 is operating, the circumference of the stator bracket 225 can be limited. Rotate in the opposite direction to limit the circumferential position of the motor.
  • three assembly portions 2112 are circumferentially distributed on the edge of the open end 2111 of the housing 210
  • three mating holes 2251 are circumferentially distributed on the edge of the stator bracket 225
  • three sleeves 2302 are circumferentially distributed in the sink groove 231 At the bottom, the mating hole 2251, the fastening hole 254 and the sleeve 2302 correspond to each other.
  • the power head 200 also includes a radial predetermined gap 248 provided on the outer side wall of the sleeve 2302 and the mating hole 2251 .
  • the radial preset gap 248 between the outer side wall of the sleeve 2302 and the mating hole 2251 refers to a unilateral gap.
  • the radial preset gap 248 between the sleeve 2302 and the mating hole 2251 increases the radial space margin for motor shaking
  • the radial preset gap 248, the radial preset gap 242 and the axial preset gap. 241 jointly provide sufficient radial and axial allowance for motor shaking, reducing the vibration transmitted from the motor to the housing, thereby achieving vibration reduction of the lawnmower and reducing the numbness in the user's hand.
  • the preset radial gap 248 between the outer wall of the sleeve 2302 and the mating hole 2251 is 0.1 mm to 1 mm. If the preset radial gap 248 between the outer wall of the sleeve 2302 and the mating hole 2251 is too large, the sleeve 2302 will not be able to effectively limit the circumferential position of the stator bracket 225. During the operation of the motor 220, Circumferential rocking will occur between the sleeve 2302 and the stator bracket 225. The preset radial gap 248 between the outer wall of the sleeve 2302 and the mating hole 2251 is too small.
  • the sleeve 2302 of 280 will contact the mating hole 2251 of the stator bracket 225, which will transmit the vibration of the motor 220 to the end cover 280, thereby transmitting it to the housing 210, and finally transmit it to the human hand, causing unpleasant numbness. Hands-on experience.
  • the radial preset gap 248 between the outer side wall of the sleeve 2302 and the mating hole 2251 may be 0.2mm, 0.5mm or 0.8mm, etc., preferably 0.5mm.
  • the power head 200 also includes: a second vibration-absorbing pad 270 (as shown in FIG. 10 ), which is disposed between the fastening hole of the assembly part 2112 and the fastener 253 , and between the assembly part 2112 and the sleeve 2302 .
  • the second damping pad 270 includes: a bottom annular portion 2701 , a peripheral wall 2703 extending upward from the inner periphery of the bottom annular portion 2701 , and a top annular portion extending outward from the peripheral wall 2703 2702, the bottom annular portion 2701 is in contact with the second countersunk hole, the peripheral wall 2703 is in contact with the side wall of the fastening hole 254, and the top annular portion 2702 is arranged in contact with the first countersunk hole.
  • fastener 253 and the internal thread 255 of the sleeve 2302 are threaded together, so that the screw presses the top annular portion 2702 of the second vibration-absorbing pad 270 against the bottom of the first counterbore.
  • the second vibration damping pad 270 is used to reduce the vibration from the end cover 280.
  • the top of the sleeve 2302 is in contact with the bottom annular portion 2701 of the second vibration damping pad 270, so that the power head The structure is more stable and.
  • the end cap 280 includes: an annular fastening seat 2801, the central area of the fastening seat 2801 is axially penetrated; a stop structure 2802 is located at the bottom of the axially penetrated area, the fastening seat 2801 and the stopper
  • the stop structure 2802 forms a sinking groove (not labeled in the figure), and a plurality of sleeves 2302 are circumferentially distributed on the edge of the stop structure 2802.
  • stator bracket 225 is in contact with the sinking groove 231 of the end cover 280 to realize the axial positioning of the motor in the accommodation cavity by the end cover 280 .
  • the present application also provides a third embodiment of a lawn trimmer.
  • the lawn mower includes a mowing head and a power head 200 that drives the mowing head to rotate.
  • the power head 200 also includes: a housing 210.
  • the housing 210 includes an open end 2111; an end cover 230 connected to the open end 2111 of the housing 210.
  • the housing 210 and the end cover 230 define a receiving cavity 211; the motor 220 is at least partially received in the receiving cavity 211.
  • the motor 220 includes an output shaft 221, a rotor assembly and a stator assembly 223.
  • the stator assembly 223 includes a stator bracket 225, and the output shaft 221 is Extends in the axial direction and is dynamically connected to the mowing head; when the motor 220 drives the mowing head to rotate, there is basically no direct contact between the outermost edge of the stator bracket 225 and the housing 210 and/or the end cover 230 to realize the motor 220 Relative movement occurs in the axial direction and the radial direction relative to the housing 210 and/or the end cap 230 .
  • the fact that there is basically no direct contact between the outermost edge of the stator bracket 225 and the housing 210 and/or the end cover 230 refers to three situations. First, the outermost edge of the stator bracket 225 and the housing 210 There is basically no direct contact between them; secondly, there is basically no direct contact between the outermost edge of the stator bracket 225 and the end cover 230; thirdly, there is basically no direct contact between the outermost edge of the stator bracket 225, the housing 210 and the end cover 230. No direct contact.
  • substantially no contact means that the outermost edge of the stator bracket 225 will not contact the housing 210 and/or the end cover 230 unless there is a large impact during use. "Big impact” occurs when the motor 220 or the trimming head touches a hard foreign object, or the operator suddenly swings the trimmer.
  • stator bracket 225 refers to the side walls of the stator bracket 225 , each step surface on the stator bracket 225 , and the area of the top and bottom surfaces of the stator bracket 225 close to the side walls.
  • an axial preset gap 241 and a radial preset gap 242 are provided between the outermost edge of the stator bracket 225 and the housing 210 .
  • the open end 2111 of the housing 210 is located radially inside the side wall of the end cover 230. Therefore, the axial gap between the outermost edge of the stator bracket 225 and the housing 210 is smaller than the outermost edge of the stator bracket 225.
  • the axial gap between the outermost edge of the stator bracket 225 and the end cover 230 and the radial gap between the outermost edge of the stator bracket 225 and the housing 210 are smaller than the radial gap between the outermost edge of the stator bracket 225 and the end cover 230 , so only Consider the axial preset gap 241 and the radial preset gap 242 between the outermost edge of the stator bracket 225 and the housing 210 .
  • the preset axial gap 241 between the motor 220 and the housing 210 is 0.15mm-3mm.
  • the range of the gap between the motor and the housing in the axial direction is 0.15mm-1mm.
  • the axial preset gap 241 is provided between the open end 2111 and the flange surface 2252. If the preset axial gap 241 between the motor 220 and the housing 210 is too large, the axial size of the housing 210 will be too large. The preset axial gap 241 between the motor 220 and the housing 210 is too small.
  • the motor 220 drives the trimming head to rotate, the motor 220 vibrates due to uneven mass distribution of the trimming head.
  • the steps of the stator bracket 225 The surface will come into contact with the open end 2111 of the housing 210, which will transmit the vibration of the motor 220 to the housing 210, and then to the human hand through the connecting rod, resulting in a bad numbness experience.
  • the axial preset gap 241 may be 0.15mm, 0.2mm, 0.95mm, 1mm, 2mm, 2.5mm, etc., preferably 0.2mm.
  • the preset radial gap 242 (as shown in Figure 12) between the motor 220 and the housing 210 is 0.1mm-1m.
  • the gap between the motor and the housing in the radial direction is 0.1mm-1m.
  • the range is 0.2mm-0.8mm.
  • the radial predetermined gap 242 is provided between the housing 210 and the mating side wall 2251. If the radial preset gap 242 between the motor 220 and the housing 210 is too large, the corresponding radial preset gap 242 between the stator bracket 225 and the inner wall of the housing 210 is larger. When the motor 220 is working and receives a sudden impact, the motor sways excessively in the radial direction inside the housing.
  • the preset radial gap 242 between the motor 220 and the housing 210 is too small.
  • the motor 220 drives the mowing head to rotate, the motor 220 vibrates due to the uneven mass distribution of the mowing head.
  • the coordination of the stator bracket 225 The side wall 2251 will contact the inner wall of the housing 210, which will transmit the vibration of the motor 220 to the housing 210 and then to the human hand, resulting in a bad numbness experience.
  • the gap width between the motor 220 and the housing 210 in the radial direction can be 0.2mm, 0.5mm, 0.8mm or 0.9mm, etc., preferably 0.5mm.
  • an axial preset gap 241 and a radial preset gap 242 are provided between the outermost edge of the stator bracket 225 and the end cover 230 .
  • the open end 2111 of the housing 210 may also be located radially outside the side wall of the end cover 230. Therefore, the axial gap between the outermost edge of the stator bracket 225 and the housing 210 is larger than the outermost edge of the stator bracket 225.
  • the axial gap between the outer edge and the end cover 230, and the radial gap between the outermost edge of the stator bracket 225 and the housing 210 are larger than the radial gap between the outermost edge of the stator bracket 225 and the end cover 230, so Only the axial clearance and the radial clearance between the outermost edge of the stator bracket 225 and the end cover 230 need to be considered.
  • an axial preset gap 2410.15mm-3mm is provided between the outermost edge of the stator bracket 225 and the end cover 230, and a radial preset gap 242 is 0.1mm-1m.
  • an axial preset gap 241 and a radial preset gap 242 are provided between the outermost edge of the stator bracket 225 and the housing 210 and the end cover 230 .
  • the radial positions of the open end 2111 of the housing 210 and the side wall of the end cover 230 are approximately the same. Therefore, the axial gap between the outermost edge of the stator bracket 225 and the housing 210 needs to be considered at the same time. radial clearance, as well as axial clearance and radial clearance between the outermost edge of the stator bracket 225 and the end cover 230 .
  • the preset axial gap 241 between the outermost edge of the stator bracket 225 and the housing 210 and the end cover 230 is also 0.15mm-3mm;
  • the radial preset gap 242 between 230 is also 0.1mm-1m.
  • FIG. 13 another form in which there is basically no direct contact between the outermost edge of the stator bracket 225 and the housing 210 and/or the end cover 230 is also proposed.
  • the power head 200 also includes: a deformation body 290 disposed between the outermost edge of the stator bracket 225 and the housing 210 and/or the end cover 230, such that the outermost edge of the stator bracket 225 is in contact with the housing 210 and/or the end cover 230. There is basically no direct contact between them.
  • the motor 220 shakes, and the axial clearance and radial clearance between the motor 220 and the housing 210 and/or the end cover 230 change.
  • the deformable body 290 can be squeezed by the motor 220 to deform, causing the motor to deform. 220 is not in direct contact with the housing 210 and/or the end cap 230.
  • the deformation body 290 is disposed simultaneously between the outermost edge of the stator bracket 225 and the housing 210 and between the outermost edge of the stator bracket 225 and the end cover 230 in the axial and radial directions. In other embodiments, the deformation body 290 is disposed between the outermost edge of the stator bracket 225 and the axial and radial directions of the housing 210 , or between the outermost edge of the stator bracket 225 and the end cover 230 in the axial and radial directions. between.
  • the deformation body 290 includes: a deformation ring part 2901 and a deformation peripheral wall 2902 extending upward from the outer periphery of the deformation ring part 2901.
  • the deformation ring part 2901 is located between the stator bracket 225 and the housing 210 in the axial direction.
  • the deformation peripheral wall 2902 is radially Upward between the stator bracket 225 and the housing 210 .
  • the deformation body 290 may also be provided only between the outer peripheral surface of the stator bracket 225 and the axial direction of the housing 210, or between the outer peripheral surface of the stator bracket 225 and the axial direction of the end cover 230, or both at the same time. It is provided between the outer peripheral surface of the stator bracket 225 and the housing 210 and between the outer peripheral surface of the stator bracket 225 and the axial direction of the end cover 230 .
  • the deformation body 290 may also be provided only on the outer peripheral surface of the stator bracket 225 and the housing 210 between the radial direction, or between the outer peripheral surface of the stator bracket 225 and the radial direction of the end cover 230, or simultaneously between the outer peripheral surface of the stator bracket 225 and the housing 210, and between the outer peripheral surface of the stator bracket 225 and the end cover 230 between the radials.
  • the material of the deformation body 290 includes rubber, silicone or other soft materials.
  • the deformation body 290 is an independent part and is arranged between the stator bracket 225 and the housing 210 .
  • the deformation body 290 can also be filled and formed between the stator bracket and the casing using a secondary injection molding process.
  • the lawn mower of the present invention has a gap distributed between the motor, the housing and the end cover in the power head that drives the mowing head, and the housing passes through the limiting
  • the structure is circumferentially fixed to the motor, allowing relative movement between the motor, the casing and the end cover in the axial and radial directions. This not only reduces the vibration transmission between the motor, the casing and the end cover, but also prevents the motor from interacting with the end cover and casing.
  • the two bodies are pressed together so that the motor can shake and find its center of gravity, thus achieving vibration reduction of the lawnmower and reducing the numbness in the user's hand.

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Abstract

一种打草机，包括打草头（100）及驱动打草头（100）的动力头（200），打草机包括具有敞开端（2111）的壳体（210）和与壳体（210）的敞开端（2111）相连的端盖（230），壳体（210）和端盖（230）限定出收容腔（211），电机（220）至少部分收容于收容腔（211），轴向预设间隙（241）以及径向预设间隙（242）设置在电机（220）与壳体（210）之间，或者电机（220）与端盖（230）之间，当电机（220）驱动打草头（100）转动时，轴向预设间隙（241）和径向预设间隙（242）能够提供运动空间，实现电机（220）相对于壳体（210）和/或端盖（230）在轴向方向与径向方向上发生相对运动，也就是说轴向预设间隙（241）和径向预设间隙（242）为电机（220）自身晃动预留足够的空间余量，减少了电机（220）向壳体（210）传导的振动，从而实现打草机的减振，减轻用户麻手感。

Description

打草机 技术领域
本发明涉及园林器械技术领域，特别涉及一种打草机。
背景技术
现有技术的打草机中，由电机带动打草头旋转实现打草功能，通常电机和打草头连接在一起。由于打草头的质量分布不均匀，打草头转动时会产生一种不平衡力的作用，这种不平衡力导致打草头旋转时产生振动，进而会传递给电机带动电机振动，进一步造成打草机握持部位麻手振动，影响用户使用体验。
发明内容
本发明的目的在于提供一种减少麻手振动的打草机。
本发明的目的是通过以下技术方案实现：
一种切割装置，包括切断元件及驱动所述切断元件的动力头，所述动力头还包括：
壳体；端盖，与所述壳体相连，且所述壳体与所述端盖限定出收容腔；电机，至少部分收容于所述收容腔，所述电机通过输出轴与所述切断元件相连；限位结构，通过所述限位结构，所述电机与所述壳体和所述端盖在周向方向上相对固定；在轴向方向和径向方向上，所述电机与所述壳体间设有间隙以使得所述电机驱动所述切断元件转动时，所述电机与所述壳体在所述轴向方向与所述径向方向上发生相对运动。
在其中一个实施例中，所述电机在所述轴向方向上与所述壳体之间的间隙的宽度范围为0.15mm-1mm。
在其中一个实施例中，所述电机在所述径向方向上与所述壳体之间的间隙的宽度范围为0.2mm-0.8mm。
在其中一个实施例中，所述电机随着所述切断元件的转动而运动以使得所述输出轴的旋转轴线与所述切断元件的旋转中心线共线。
在其中一个实施例中，所述电机工作时所述输出轴的旋转轴线与所述电机不工作时所述输出轴的旋转轴线构成锐角夹角，且所述锐角夹角的范围为0.4°-2°。
在其中一个实施例中，所述电机分别在所述轴向方向上和所述径向方向上与所述壳体之间的间隙，大于所述电机驱动所述切断元件转动时所述电机分别在所述轴向方向和所述径向方向上的振幅。
在其中一个实施例中，所述电机为外转子电机，包括定子、位于所述定子外侧的转子以及支撑所述定子的定子支架，所述间隙设于所述定子支架与所述壳体之间。
在其中一个实施例中，所述限位结构包括缺口和与缺口相配合的凸块，所述缺口和凸块分别设于所述壳体和定子支架上，在所述周向方向上，所述凸块的侧壁与所述缺口的槽壁抵顶。
在其中一个实施例中，所述限位结构包括螺钉、通孔和与螺钉相配合的螺孔，所述通孔设于所述定子支架，所述螺孔分别设于所述壳体和所述端盖，其中，所述螺钉穿设于所述螺孔和通孔中将所述端盖与壳体固定连接，且在所述周向方向上，所述螺钉两侧 与所述通孔的孔壁抵顶。
在其中一个实施例中，所述切割装置为打草机，所述切断元件为打草头。
一种打草机，包括打草头及驱动所述打草头转动的动力头，所述动力头还包括：壳体，所述壳体包括敞开端；端盖，与所述壳体的敞开端相连，所述壳体与所述端盖限定出收容腔；电机，至少部分收容于所述收容腔，所述电机包括输出轴、转子组件和定子组件，所述输出轴沿轴向方向延伸且与所述打草头动力连接；所述电机与所述壳体之间设有轴向预设间隙以及径向预设间隙，或者所述电机与所述端盖之间设有轴向预设间隙以及径向预设间隙，当所述电机驱动所述打草头转动时，所述轴向预设间隙和所述径向预设间隙能够提供运动空间，实现所述电机相对于所述壳体和/或所述端盖在轴向方向与径向方向上发生相对运动。
在其中一个实施例中，所述定子组件包括定子以及支撑所述定子的定子支架，所述轴向预设间隙和所述径向预设间隙设于所述定子支架与所述壳体之间；或者，所述轴向预设间隙和所述径向预设间隙设于所述定子支架与所述端盖之间。
在其中一个实施例中，所述轴向预设间隙为0.15mm-3mm。
在其中一个实施例中，所述径向预设间隙为0.1mm-1mm。
在其中一个实施例中，所述定子支架包括：配合侧壁，用于供所述壳体的所述敞开端罩设；凸缘面，与所述配合侧壁构成台阶状，所述敞开端套设在配合侧壁上，所述径向预设间隙设于所述壳体和所述配合侧壁之间，所述轴向预设间隙设于所述敞开端和所述凸缘面之间。
在其中一个实施例中，当所述电机驱动所述打草头转动时，所述输出轴绕第一中心轴线转动，当所述电机处于未驱动打草头转动的非工作状态时，所述输出轴具有第二中心轴线，所述第一中心轴线和第二中心轴线构成锐角夹角，且所述锐角夹角的范围为0.4°-3°。
在其中一个实施例中，所述电机为外转子电机，所述电机的转子的顶壁与所述壳体在轴向上设有第一间隙，所述第一间隙为1.5mm至10mm，所述电机的转子的侧壁和所述壳体内侧壁在径向上设有第二间隙，所述第二间隙为3mm至10mm。
在其中一个实施例中，所述动力头还包括：第一减振垫，设置在所述电机和所述端盖之间，用于减小所述电机和所述端盖之间的振动传递。
在其中一个实施例中，所述电机的定子组件包括定子支架，所述定子支架底部设置有向下延伸的凸出部，所述凸出部用于安装轴承，所述输出轴伸出所述凸出部；所述端盖设置有用于与所述凸出部配合的端盖凹槽，所述端盖凹槽底部设置有供所述输出轴穿过的开孔；所述第一减振垫在轴向上和径向上均设置在所述凸出部和所述端盖凹槽之间。
在其中一个实施例中，所述定子组件包括定子支架；所述动力头还包括：设于所述壳体上的缺口，以及设于所述定子支架上的凸块，在所述周向方向上，所述凸块能够与所述缺口的槽壁抵顶，用于对所述定子组件进行周向限位；所述敞开端的边缘周向分布有多个装配部，所述端盖和所述装配部通过紧固件紧固连接来对电机进行轴向限位。
在其中一个实施例中，所述敞开端的边缘周向分布有多个装配部，所述装配部设置有紧固孔；所述定子支架的边缘周向分布有多个配接孔；所述端盖包括：沉槽，用于与所述壳体的敞开端配合；多个套筒，周向分布在所述沉槽的底部且面向所述壳体，所述套筒向上延伸贯穿所述定子支架的配接孔；紧固件，穿过所述紧固孔与所述套筒进行轴向紧固连接。
在其中一个实施例中，所述动力头还包括设置在所述套筒的外侧壁和所述配接孔的径向预设间隙。
在其中一个实施例中，所述动力头还包括：第二减振垫，设置在所述壳体中所述紧固孔和所述紧固件之间，以及所述装配部和所述套筒之间。
在其中一个实施例中，所述端盖包括：呈环状的紧固座，所述紧固座的中心区域轴向贯通；止位结构，位于所述轴向贯通区域的底部，所述紧固座和止位结构构成所述沉槽，多个所述套筒周向分布在所述止位结构的边缘。
一种打草机，包括打草头及驱动所述打草头转动的动力头，所述动力头还包括：壳体，所述壳体包括敞开端；端盖，与所述壳体的所述敞开端相连，所述壳体与所述端盖限定出收容腔；电机，至少部分收容于所述收容腔，所述电机包括输出轴、转子组件和定子组件，所述定子组件包括定子支架，所述输出轴沿轴向方向延伸且与所述打草头动力连接；其特征在于，当所述电机驱动所述打草头转动时，所述定子支架的最外缘与所述壳体和/或所述端盖之间基本无直接接触，以实现所述电机相对于所述壳体和/或所述端盖在轴向方向与径向方向上发生相对运动。
在其中一个实施例中，当所述电机驱动所述打草头转动时，所述输出轴绕第一中心轴线转动，当所述电机处于未驱动打草头转动的非工作状态时，所述输出轴具有第二中心轴线，所述第一中心轴线和第二中心轴线构成锐角夹角，且所述锐角夹角的范围为0.4°-3°。
在其中一个实施例中，所述电机为外转子电机，所述电机的转子的顶壁与所述壳体在轴向上设有第一间隙，所述第一间隙为1.5mm至10mm，所述电机的转子的侧壁和所述壳体内侧壁在径向上设有第二间隙，所述第二间隙为3mm至10mm。
在其中一个实施例中，所述定子支架的最外缘与所述壳体之间设有轴向预设间隙以及径向预设间隙；或者，所述定子支架的最外缘与所述端盖之间设有轴向预设间隙以及径向预设间隙；或者，所述定子支架的最外缘与所述壳体和所述端盖之间设有轴向预设间隙以及径向预设间隙。
在其中一个实施例中，所述动力头还包括：变形体，设置在所述定子支架的最外缘与所述壳体和/或所述端盖之间，使得所述定子支架的最外缘与所述壳体和/或所述端盖之间基本无直接接触。
在其中一个实施例中，所述动力头还包括：所述变形体设置在所述定子支架的最外缘与所述壳体的轴向和径向之间，或设置在所述定子支架的最外缘与所述端盖的轴向和径向之间，或同时设置在所述定子支架的最外缘与所述壳体以及定子支架的最外缘与所述端盖的轴向和径向之间。
与现有技术相比，本发明具有如下有益效果：本发明的打草机包括具有敞开端的壳体和与壳体的敞开端相连的端盖，壳体和端盖限定出收容腔，电机至少部分收容于收容腔，轴向预设间隙以及径向预设间隙设置在电机与所述壳体之间，或者所述电机与所述端盖之间，当电机驱动所述打草头转动时，轴向预设间隙和径向预设间隙能够提供运动空间，实现电机相对于壳体和/或所述端盖在轴向方向与径向方向上发生相对运动，也就是说轴向预设间隙和径向预设间隙为电机自身晃动预留足够的空间余量，减少了电机向壳体传导的振动，从而实现打草机的减振，减轻用户麻手感。
附图说明
以上所述的本发明的目的、技术方案以及有益效果可以通过下面的能够实现本发明 的具体实施例的详细描述，同时结合附图描述而清楚地获得。
附图以及说明书中的相同的标号和符号用于代表相同的或者等同的元件。
图1是本发明打草机头部的示意图；
图2是本发明打草机的动力头一个视角的爆炸图；
图3是本发明打草机的动力头另一个视角的爆炸图；
图4是本发明打草机中端盖的轴测示意图；
图5是本发明打草机第一实施例头部的剖示图；
图6是图4中A处的局部放大图；
图7是本发明打草机头部的第一减振垫的结构示意图；
图8是本发明打草机晃动状态示意图；
图9是本发明打草机第二实施例头部的剖视图；
图10是图9中B处的局部放大图；
图11是本发明打草机第二实施例中第二减振垫的结构示意图；
图12是本发明打草机第三实施例头部的一情况剖视图；
图13是本发明打草机第三实施例头部的另一情况剖视图；
图14是本发明打草机第三实施例头部中另一剖视图的变形体的剖视图。
具体实施方式
以下将结合附图所示的各实施方式对本申请进行详细描述。但该等实施方式并不限制本申请，本领域的普通技术人员根据该等实施方式所做出的结构、方法、或功能上的变换均包含在本申请的保护范围内。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。在所示出的实施例中，方向表示即上、下、左、右、前和后等是相对的，用于解释本申请中不同部件的结构和运动是相对的。当部件处于图中所示的位置时，这些表示是恰当的。但是，如果元件位置的说明发生变化，那么认为这些表示也将相应地发生变化。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
本申请实施例中，切割装置采用打草机进行距离，但切割装置并不仅限于打草机，也可以包括割灌机、链锯、摆动机等。
打草机包括作用于待切割物的打草头100及驱动该打草头100的动力头200。其中打草头包括：设置有为缠绕打草绳的线盘。动力头200还包括：壳体210，壳体210包括敞开端2111；端盖230，与壳体210的敞开端2111相连，壳体210与端盖230限定出收容腔211；电机220，至少部分收容于收容腔211，电机220包括输出轴221、转子组件和定子组件223，输出轴221和沿轴向方向延伸且与打草头动力连接，定子组件223包括定子支架225，输出轴221沿轴向方向延伸且与打草头动力连接；当电机220驱动打草头转动时，定子支架225的最外缘与壳体210和/或端盖230之间基本无直接接触，以实现电机220相对于壳体210和/或端盖230在轴向方向与径向方向上发生相对运动。
需要说明的是，打草头100产生的振动带动电机220振动，电机220远离打草头100一端的振幅大于电机220靠近打草头100一端的振幅。其他实施例中，电机220远离打草头100的方向上，电机220与壳体210间的第二间隙渐渐变宽，以适应电机220轴上各处的不同径向振幅，在不影响电机220结构强度的情况下，减少与外壳222碰撞。
本实施例中，当电机220驱动打草头转动时，输出轴221绕第一中心轴线2211(如图8所示)转动，当电机220处于未驱动打草头转动的非工作状态时，输出轴221具有第二中心轴线231(如图8所示)，第一中心轴线2211和第二中心轴线231构成锐角夹角，亦即输出轴221因晃动产生偏转的角度，且锐角夹角的范围为0.4°-3°。电机220的输出轴221产生上述角度的晃动，晃动随打草头100旋转而产生，设置一定晃动角度可帮助打草头100的旋转中心与电机220的输出轴221始终共线，在振动不传递给壳体210的情形下可实现减振目的，减少用户麻手感。具体的，夹角可以为0.4°、0.6°、1.8°或2°等，优选地，夹角为0.6°。
本实施例中，电机220的转子224的顶壁与壳体210在轴向上设有第一间隙，第一间隙为1.5mm至10mm。若第一间隙过大，在电机220尺寸不变的情况下，会导致壳体210的尺寸过大，造成壳体210材料的浪费。若第一间隙过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，转子224的顶壁和壳体210顶壁会接触，会将电机220的振颤传递到壳体210上，进而通过连接杆传递到人手处，产生不好的麻手体验。例如，第一间隙为1.6mm、2mm、2.5mm。
本实施例中，电机220的转子224的侧壁和壳体210内侧壁在径向上设有第二间隙，第二间隙为3mm至10mm。若第二间隙过大，在电机220尺寸不变的情况下，会导致壳体210的尺寸过大，造成壳体210材料的浪费。若第二间隙过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，转子224的侧壁和壳体210侧壁会接触，会将电机220的振颤传递到壳体210上，进而通过连接杆传递到人手处，产生不好的麻手体验。例如，第二间隙为3mm、3.2mm、4.5mm。需要说明的是，第二间隙是电机220的转子224的侧壁和壳体210内侧壁在径向上的单边间隙。
参考图1至图8示出了打草机第一实施例的结构示意图。
电机220与壳体210之间设有轴向预设间隙241以及径向预设间隙242，或者电机220与端盖230之间设有轴向预设间隙241以及径向预设间隙242，当电机220驱动打草头转动时，轴向预设间隙241和径向预设间隙242能够提供运动空间，实现电机220相对于壳体210和/或端盖230在轴向方向D(如图2所示)与径向方向L(如图2所示)上发生相对运动。
本发明提供的打草机的轴向预设间隙241以及径向预设间隙242设置在电机220与壳体210之间，或者设置在电机220与端盖230之间，当电机220驱动打草头转动时，轴向预设间隙241和径向预设间隙242能够提供运动空间，实现电机220相对于壳体210和/或端盖230在轴向方向与径向方向上发生相对运动，也就是说轴向预设间隙241和径向预设间隙242为电机220自身晃动预留足够的空间余量，减少了电机220向壳体210传导的振动，从而实现打草机的减振，减轻用户麻手感。
本实施例中，壳体210包括有敞开端2111，敞开端2111可由壳体210一端敞开、不封闭而形成。
本实施例中，壳体210的敞开端2111边缘周向等角度分布有多个装配部2112，装配部2112和敞开端2111一体成型，装配部2112自壳体210的外侧沿着径向向外凸伸，装 配部2112上设有一个大致沿着平行于枢转轴线的方向(输出轴221方向)延伸的紧固孔254。具体的，紧固孔254为通孔。
电机220与打草头连接，带动打草头100对待切割物进行切割。
本实施例中，电机220类型为外转子电机220。具体的，电机220包括输出轴221、转子组件224(如图5所示)和定子组件223(如图5所示)。电机220的输出轴221和打草头100连接，输出轴221的底部设置有与打草头连接的螺纹，转子组件224与输出轴221固定连接。
转子组件包括：转子套筒(图中未标示)和磁性件(图中未标示)。转子套筒为内部中空的圆柱体。磁性件包括多个，多个磁性件在转子套筒的内壁上呈周向均匀排列。在本实施例中，转子组件中还可以包括一个转子盖板(图中未标示)，用于封闭转子套筒，可以理解的，转子套筒与转子盖板也可以一体成型。
定子组件223部分容纳于转子套筒中，其包括：定子支架225、定子铁芯和线圈组件，定子铁芯固定在定子支架225上，线圈组件缠绕在定子铁芯上。
其中，定子支架225包括：支架部，支架部一端插入到定子铁芯中，与定子铁芯固定连接。
本实施例中，定子支架225还包括：配合侧壁2251(如图6所示)，用于供壳体210的敞开端2111罩设；凸缘面2252(如图6所示)，与配合侧壁2251构成台阶状，敞开端2111套设在配合侧壁2251上，径向预设间隙242设于壳体210和配合侧壁2251之间，轴向预设间隙241设于敞开端2111和凸缘面2252之间。
需要说明的是，定子支架225底部设置有向下延伸的凸出部226(如图6所示)，输出轴221伸出凸出部226。本实施例中，凸出部226提供容纳轴承的轴承腔室。
端盖230安装于该敞开端2111处，端盖230与壳体210固定连接可封闭壳体210形成收容腔211。
本实施例中，端盖230上设置有用于与壳体210的敞开端2111配接的沉槽231，沉槽用于容纳定子支架225，沉槽231的周边设置设置有与装配部2112对应的螺纹孔，壳体210的装配部2112和螺纹孔通过紧固件253进行螺纹紧固连接。
本实施例中，端盖230上设置有用于与凸出部226配合的端盖凹槽232，端盖凹槽232底部设置有供输出轴221穿过的开孔。
需要说明的是，端盖凹槽232，位于沉槽231的中心位置。
本实施例中，电机220收容于或至少部分收容于收容腔211中，端盖230和装配部2112通过紧固件253紧固连接来对电机220进行轴向限位。阻止电机220与壳体210分离。
本实施例中，当电机220部分收容于收容腔211内时，电机220的输出轴221可由端盖230上的端盖凹槽232延伸出收容腔211，进而与打草头100相连。在不同的实施方式中，电机220全收容于收容腔211内，并可通过另一传动轴与打草头100相连，电机220通过传动轴驱动打草头100。
动力头200还包括：第一减振垫260在轴向上和径向上均设置在电机220和端盖230之间，用于减小电机220和端盖230之间的振动传递。
本实施例中，第一减振垫260，设置在凸出部226和端盖凹槽232之间，且第一减振垫260还延伸设置在端盖凹槽232顶部边缘。
具体的，第一减振垫260包括：第一环状部2601(如图7所示)、自第一环状部2601 的外周边向上延伸的环状周壁260(如图7所示)2、以及自环状周壁2602向外延伸的第二环状部2603(如图7所示)，第一环状部2601在轴向上位于凸出部226和端盖凹槽232的底面之间，环状周壁2602在径向上位于凸出部226和端盖凹槽232侧壁之间，第二环状部2603延伸在端盖凹槽232顶部的边缘。
动力头200还包括：限位结构250(如图2所示)，用于使电机220与壳体210在周向方向上相对固定，使电机220仅能在轴向和径向上产生一定幅度的振动。
本实施例中，限位结构250包括：设于壳体210上的缺口251(如图2所示)，以及设于定子支架225上的凸块252(如图2所示)，在周向方向上，凸块252能够与缺口251的槽壁抵顶，用于对定子组件223进行周向限位。
具体的，为使壳体210与电机220在周向上固定，凸块252设于定子支架225沿电机220周向方向上的外侧面。缺口251则设于壳体210上与凸块252的相应位置，使壳体210与定子支架225在装配时缺口251和凸块252相互配合。在不同实施方式中，缺口251可以由壳体210截断部分壁面形成，或增设于壳体210外侧。
需要说明的是，上述凸块252和缺口251可以是一个、两个、三个或其他多个，在此不作限制。同一缺口251也可以对应设置相配合的一个或两个凸块252，如当一个缺口251对应设置一个凸块252时，则凸块252在电机220周向方向上的两个外侧壁分别与缺口251在电机220周向方向上的两个内侧壁抵顶；当一个缺口251对应设置两个凸块252时，两个凸块252间隔设置并各自有一个外侧壁与缺口251的不同内侧壁抵顶。
请具体参阅图2，为了便于理解，在本发明的优选实施例中，以电机220的输出轴221的延伸方向为轴向方向D，以绕电机220的外周进行圆周旋转的方向为周向方向W，以与轴向方向D垂直的方向为径向方向L。
轴向预设间隙241(如图6所示)和径向预设间隙242(如图6所示)设于定子支架225与壳体210或端盖230之间。轴向预设间隙241是指敞开端2111和凸缘面2252之间的间隙，径向预设间隙242是指壳体210和配合侧壁2251之间，轴向预设间隙241和径向预设间隙242并非装配所留的公差间隙，而是为了电机220工作时，使电机220相对于壳体210在轴向与径向上发生相对运动特意预留的间隙，预留的间隙大于电机220的晃动量，使电机220和壳体210不会接触，进而电机220在晃动过程中的振动不会轻易传导给壳体210，进而提升打草机的持握体验。
轴向预设间隙241和径向预设间隙242可根据电机220驱动打草头100转动时，电机轴向方向和径向方向上的振动幅度确定。电机220在轴向方向或径向方向的振幅越大，则对应预设间隙越大。在其中一个实施例中，为了保证电机220不与壳体210或端盖产生碰撞、传导振动，轴向预设间隙241和径向预设间隙242均大于电机220分别在轴向方向和径向方向上的振幅。
本实施例中，电机220和壳体210之间的轴向预设间隙241(如图6所示)为0.15mm-3mm，优选的，电机在轴向方向上与壳体之间的间隙的范围为0.15mm-1mm。具体的，轴向预设间隙241设于敞开端2111和凸缘面2252之间。若电机220和壳体210之间的轴向预设间隙241过大，会导致壳体210的轴向尺寸过大。电机220和壳体210之间的轴向预设间隙241过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，定子支架225的台阶面会和壳体210的敞开端2111接触，会将电机220的振颤传递到壳体210上，进而传递到人手处，产生不好的麻手体验。例如，轴向预设间隙241可以为0.15mm、0.2mm、0.95mm、1mm、2mm、2.5mm等，优选地为 0.2mm。
本实施例中，电机220和壳体210之间的径向预设间隙242(如图6所示)为0.1mm-1m，优选的，电机在径向方向上与壳体之间的间隙的范围为0.2mm-0.8mm。具体的，径向预设间隙242设于壳体210和配合侧壁2251之间。若电机220和壳体210之间的径向预设间隙242过大，相应的定子支架225和壳体210内侧壁的径向预设间隙242较大，在电机220工作时，受到骤然的冲击时，电机在壳体内部径向晃动量过大。电机220和壳体210之间的径向预设间隙242过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，定子支架225的配合侧壁2251会和壳体210内侧壁会接触，会将电机220的振颤传递到壳体210上，进而传递到人手处，产生不好的麻手体验。电机220分别径向方向与壳体210间的间隙宽度可以为0.2mm、0.5mm、0.8mm或0.9mm等，优选地为0.5mm。
需要说明的是，壳体210和配合侧壁2251之间的径向预设间隙242指代的是单边间隙。
本实施例中，定子支架225和端盖230之间也设有具有轴向预设间隙245(如图6所示)。具体的，端盖230设置有与敞开端2111对置的沉槽231，定子支架225和端盖230之间的轴向预设间隙245指代的是定子支架225和沉槽231之间的轴向间隙，具体为0.15mm-3mm。若定子支架225和端盖230之间的轴向预设间隙245过大，会导致动力头200轴向尺寸过大。若定子支架225和端盖230之间的轴向预设间隙245过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，定子支架225和端盖230之间接触，会将电机220的振颤传递到壳体210上，进而通过连接杆传递到人手处，产生不好的麻手体验。例如，轴向预设间隙245可以为0.15mm、0.2mm、0.95mm、1mm、2mm、2.5mm等，优选地为0.2mm。
本实施例中，因为定子支架225和端盖230之间具有轴向预设间隙245，且定子支架225和壳体210的敞开端2111具有轴向预设间隙245，因此定子支架225的凸缘面2252至定子支架225底面的轴向尺寸D1(如图6所示)小于敞开端2111的端面至端盖230的沉槽231底面的轴向尺寸D2(如图6所示)。
本实施例中，定子支架225和端盖230之间也设有具有径向预设间隙246(如图6所示)。径向预设间隙246位于定子支架225的径向最外的侧壁和端盖230的套筒2302之间。径向预设间隙246在0.1mm-3m之间。例如：0.2mm、1mm、2mm等，优选地为2mm。
需要说明的是，轴向预设间隙和径向预设间隙设置在定子支架与壳体之间的同时，还设置在定子支架与端盖之间。其他实施例中，轴向预设间隙和径向预设间隙还可以仅设置在定子支架与壳体之间，或者仅设置在定子支架与端盖之间。
参考图9至图11，本申请实施例还提供打草机的第二实施例。
本实施例与打草机第一实施例的相同之处在此不赘述，不同之处在于：
壳体210的敞开端2111的边缘周向分布有多个装配部2112(如图10所示)，装配部2112设置有紧固孔254；定子支架225的边缘周向分布有多个配接孔2251(如图10所示)，配接孔2251和紧固孔254对应；端盖280包括：沉槽231，用于与壳体210的敞开端2111配合；多个套筒2302(如图10所示)，周向分布在沉槽231的底部且面向壳体210，套筒2302向上延伸贯穿定子支架225的配接孔2251；紧固件253，贯穿紧固孔254与套筒2302进行轴向紧固连接。
本实施例中，紧固件253为螺钉，套筒2302内设置有内螺纹255(如图4所示)，紧 固件253贯穿装配部2112的紧固孔254与套筒2302的内螺纹255进行螺纹配合，实现壳体210和端盖280的轴向固定连接。
需要说明的是，紧固孔254的顶部设置有第一沉头孔(图中未标示)，紧固孔254底部设置有第二沉头孔，紧固孔254贯穿设置在第一沉头孔和第二沉头孔之间。
需要说明的是，套筒2302贯穿定子支架225的配接孔2251，且套筒2302和贯穿紧固孔的紧固件253紧固连接，从而在电机220工作时，能够限制定子支架225的周向转动，对电机进行周向限位。
本实施例中，壳体210的敞开端2111的边缘周向分布有三个装配部2112，定子支架225的边缘周向分布有三个配接孔2251，三个套筒2302周向分布在沉槽231的底部，配接孔2251、紧固孔254和套筒2302相对应。
动力头200还包括设置在套筒2302的外侧壁和配接孔2251的径向预设间隙248。需要说明的是，套筒2302的外侧壁和配接孔2251的径向预设间隙248指代的是单边的间隙。电机工作时，套筒2302和配接孔2251之间的径向预设间隙248增加电机晃动的径向空间余量，径向预设间隙248、径向预设间隙242以及轴向预设间隙241共同为电机晃动提供足够的径向和轴向余量，减少了电机向壳体传导的振动，从而实现打草机的减振，减轻用户麻手感。
本实施例中，套筒2302的外侧壁和配接孔2251的径向预设间隙248为0.1mm至1mm。若套筒2302的外侧壁和配接孔2251的径向预设间隙248过大，会导致套筒2302不能很好的对定子支架225起到周向限位作用，在电机220工作过程中，套筒2302和定子支架225之间会产生周向晃动。套筒2302的外侧壁和配接孔2251的径向预设间隙248过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，端盖280的套筒2302会和定子支架225的配接孔2251接触，会将电机220的振颤传递到端盖280上，从而传递至壳体210上，最终传递到人手处，产生不好的麻手体验。套筒2302的外侧壁和配接孔2251的径向预设间隙248可以为0.2mm、0.5mm或0.8mm等，优选地为0.5mm。
动力头200还包括：第二减振垫270(如图10所示)，设置在装配部2112的紧固孔和紧固件253之间，以及装配部2112和套筒2302之间。
具体的，如图11所示，第二减振垫270包括：底环状部2701、自底环状部2701的内周边向上延伸的周壁2703、以及自周壁2703向外延伸的顶环状部2702，底环状部2701和第二沉头孔抵接，周壁2703和紧固孔254侧壁接触，顶环状部2702设置在第一沉头孔抵接。需要说明的是，紧固件253和套筒2302的内螺纹255进行螺纹配合，使得螺钉将第二减振垫270的顶环状部2702压紧在第一沉孔底部。
需要说明的是，第二减振垫270用于降低来自端盖280的振动，本实施例中，套筒2302的顶部和第二减振垫270的底环状部2701抵接，使得动力头结构更加稳固和。其他实施例中，套筒2302的顶部和第二减振垫270的顶环状部2702之间具有间隙设置。
如图10所示，端盖280包括：呈环状的紧固座2801，紧固座2801的中心区域轴向贯通；止位结构2802，位于轴向贯通区域的底部，紧固座2801和止位结构2802构成沉槽(图中未标示)，多个套筒2302周向分布在止位结构2802的边缘。
需要说明的是，定子支架225的底部和端盖280的沉槽231抵接，来实现端盖280对电机在容纳腔中的轴向定位。
参考图12至图14，本申请还提供打草机的第三实施例。
本实施例与打草机第一实施例的相同之处在此不再赘述，不同之处在于：
打草机包括打草头及驱动打草头转动的动力头200，动力头200还包括：壳体210，壳体210包括敞开端2111；端盖230，与壳体210的敞开端2111相连，壳体210与端盖230限定出收容腔211；电机220，至少部分收容于收容腔211，电机220包括输出轴221、转子组件和定子组件223，定子组件223包括定子支架225，输出轴221沿轴向方向延伸且与打草头动力连接；当电机220驱动打草头转动时，定子支架225的最外缘与壳体210和/或端盖230之间基本无直接接触，以实现电机220相对于壳体210和/或端盖230在轴向方向与径向方向上发生相对运动。
本发明提供的打草机工作时，定子支架225的最外缘与壳体210和/或端盖230之间基本无直接接触，以实现电机220相对于壳体210和/或端盖230在轴向方向与径向方向上发生相对运动，也就是说在电机220工作时，在电机220发生晃动的情况下，电机220也与壳体210和/或端盖230之间基本无直接接触，减少了电机220向壳体210传导的振动，从而实现打草机的减振，减轻用户麻手感。
需要说明的是，定子支架225的最外缘与壳体210和/或端盖230之间基本无直接接触指代的是三种情况，第一，定子支架225的最外缘与壳体210之间基本无直接接触；第二，定子支架225的最外缘与端盖230之间基本无直接接触；第三，定子支架225的最外缘与壳体210和端盖230之间均基本无直接接触。
需要说明的是，基本无接触指代的是，在使用过程中除非有大的冲击，否则定子支架225的最外缘不会与壳体210和/或端盖230接触。“大的冲击”的情况例如电机220或打草头触碰到坚硬的异物，或者操作人员骤然的挥动打草机等。
需要说明的是，定子支架225的最外缘指代的是定子支架225的侧壁、定子支架225上的各个台阶面以及定子支架225的顶面和底面靠近侧壁的区域。
如图12所示，本实施例中，定子支架225的最外缘与壳体210之间设有轴向预设间隙241以及径向预设间隙242。本实施例中，壳体210的敞开端2111位于端盖230侧壁径向的内侧，因此，定子支架225的最外缘和壳体210之间的轴向间隙小于定子支架225的最外缘和端盖230之间的轴向间隙，定子支架225的最外缘和壳体210之间的径向间隙小于定子支架225的最外缘和端盖230之间的径向间隙，因此仅需要考虑定子支架225的最外缘与壳体210之间的轴向预设间隙241以及径向预设间隙242。
本实施例中，电机220和壳体210之间的轴向预设间隙241为0.15mm-3mm，优选的，电机在轴向方向上与壳体之间的间隙的范围为0.15mm-1mm。具体的，轴向预设间隙241设于敞开端2111和凸缘面2252之间。若电机220和壳体210之间的轴向预设间隙241过大，会导致壳体210的轴向尺寸过大。电机220和壳体210之间的轴向预设间隙241过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，定子支架225的台阶面会和壳体210的敞开端2111接触，会将电机220的振颤传递到壳体210上，进而通过连接杆传递到人手处，产生不好的麻手体验。例如，轴向预设间隙241可以为0.15mm、0.2mm、0.95mm、1mm、2mm、2.5mm等，优选地为0.2mm。
本实施例中，电机220和壳体210之间的径向预设间隙242(如图12所示)为0.1mm-1m，优选的，电机在径向方向上与壳体之间的间隙的范围为0.2mm-0.8mm。具体的，径向预设间隙242设于壳体210和配合侧壁2251之间。若电机220和壳体210之间的径向预设间隙242过大，相应的定子支架225和壳体210内侧壁的径向预设间隙242较大， 在电机220工作时，受到骤然的冲击时，电机在壳体内部径向晃动量过大。电机220和壳体210之间的径向预设间隙242过小，当电机220驱动打草头转动时，电机220在打草头质量分布不均匀的情况下发生振动时，定子支架225的配合侧壁2251会和壳体210内侧壁会接触，会将电机220的振颤传递到壳体210上，进而传递到人手处，产生不好的麻手体验。电机220分别径向方向与壳体210间的间隙宽度可以为0.2mm、0.5mm、0.8mm或0.9mm等，优选地为0.5mm。
其他实施例中，定子支架225的最外缘与端盖230之间设有轴向预设间隙241以及径向预设间隙242。其他实施例中，壳体210的敞开端2111还可位于端盖230侧壁径向的外侧，因此，定子支架225的最外缘和壳体210之间的轴向间隙大于定子支架225的最外缘和端盖230之间的轴向间隙，定子支架225的最外缘和壳体210之间的径向间隙大于定子支架225的最外缘和端盖230之间的径向间隙，因此仅需要考虑定子支架225的最外缘与端盖230之间的轴向间隙以及径向间隙。
需要说明的是，定子支架225的最外缘与端盖230之间设有轴向预设间隙2410.15mm-3mm，径向预设间隙242为0.1mm-1m。
在另一些实施例中，定子支架225的最外缘与壳体210和端盖230之间均设有轴向预设间隙241以及径向预设间隙242。在另一些实施例中，壳体210的敞开端2111和端盖230侧壁的径向位置近似相同，因此，需要同时考虑定子支架225的最外缘与壳体210之间的轴向间隙和径向间隙，以及定子支架225的最外缘和端盖230之间的轴向间隙和径向间隙。
需要说明的是，定子支架225的最外缘与壳体210和端盖230之间的轴向预设间隙241也为0.15mm-3mm；定子支架225的最外缘与壳体210和端盖230之间的径向预设间隙242也为0.1mm-1m。
如图13所示，还提出了定子支架225的最外缘与壳体210和/或端盖230之间基本无直接接触的另一种形式。
动力头200还包括：变形体290，设置在定子支架225的最外缘与壳体210和/或端盖230之间，使得定子支架225的最外缘与壳体210和/或端盖230之间基本无直接接触。
打草机工作时，电机220发生晃动，电机220与壳体210和/或端盖230之间的轴向间隙和径向间隙发生变化，变形体290能够被电机220挤压产生变形，使得电机220与壳体210和/或端盖230不直接接触。
如图14所示，本实施例中，变形体290设置同时设置在定子支架225的最外缘与壳体210以及定子支架225的最外缘与端盖230的轴向和径向之间。另一些实施例中，变形体290设置在定子支架225的最外缘与壳体210的轴向和径向之间，或设置在定子支架225的最外缘与端盖230的轴向和径向之间。
变形体290为包括：变形环部2901、自变形环部2901的外周边向上延伸的变形周壁2902，变形环部2901在轴向上位于定子支架225和壳体210之间，变形周壁2902在径向上位于定子支架225和壳体210之间。
其他实施例中，变形体290还可以仅设置在定子支架225的外周面与壳体210的轴向之间，或设置在定子支架225的外周面与端盖230的轴向之间，或同时设置在定子支架225的外周面与壳体210以及定子支架225的外周面与端盖230的轴向之间。
在另一些实施例中，变形体290还可以仅设置在定子支架225的外周面与壳体210 的径向之间，或设置在定子支架225的外周面与端盖230的径向之间，或同时设置在定子支架225的外周面与壳体210以及定子支架225的外周面与端盖230的径向之间。
本实施例中，变形体290的材料包括橡胶、硅胶或者其他软性材质。
本实施例中，变形体290是一个独立的零件，且设置在定子支架225和壳体210之间。其他实施例中，变形体290还可以采用二次注塑成型的工艺填充形成在定子支架和壳体之间。
与现有技术相比，本发明具有如下有益效果：本发明的打草机，在驱动打草头的动力头中设置分布于电机与壳体和端盖间的间隙，壳体则通过限位结构与电机周向固定，使电机与壳体和端盖在轴向和径向上可产生相对运动，不但减少了电机与壳体和端盖间的振动传导，还可避免电机与端盖和壳体之间顶死，让电机可晃动并自身寻找重心，从而实现打草机的减振，减轻用户麻手感。
以上述依据本申请的理想实施例为启示，通过上述的说明内容，相关工作人员完全可以在不偏离本项申请技术思想的范围内，进行多样的变更以及修改。本项申请的技术性范围并不局限于说明书上的内容，必须要根据权利要求范围来确定其技术性范围。

Claims (20)

  1. 一种打草机，包括打草头及驱动所述打草头转动的动力头，所述动力头还包括：
    壳体，所述壳体包括敞开端；
    端盖，与所述壳体的敞开端相连，所述壳体与所述端盖限定出收容腔；
    电机，至少部分收容于所述收容腔，所述电机包括输出轴、转子组件和定子组件，所述输出轴沿轴向方向延伸且与所述打草头动力连接；
    其特征在于，所述电机与所述壳体和/或端盖之间设有轴向预设间隙以及径向预设间隙，当所述电机驱动所述打草头转动时，所述轴向预设间隙和所述径向预设间隙能够提供运动空间，实现所述电机相对于所述壳体和/或所述端盖在轴向方向与径向方向上发生相对运动。
  2. 根据权利要求1所述的打草机，其特征在于，所述定子组件包括定子以及支撑所述定子的定子支架，所述轴向预设间隙和所述径向预设间隙设于所述定子支架与所述壳体之间；
    或者，所述轴向预设间隙和所述径向预设间隙设于所述定子支架与所述端盖之间。
  3. 根据权利要求2所述的打草机，其特征在于，所述轴向预设间隙为0.15mm-3mm。
  4. 根据权利要求2所述的打草机，其特征在于，所述径向预设间隙为0.1mm-1mm。
  5. 根据权利要求2所述的打草机，其特征在于，所述定子支架包括：
    配合侧壁，用于供所述壳体的所述敞开端罩设；
    凸缘面，与所述配合侧壁构成台阶状，所述敞开端套设在配合侧壁上，所述径向预设间隙设于所述壳体和所述配合侧壁之间，所述轴向预设间隙设于所述敞开端和所述凸缘面之间。
  6. 根据权利要求1所述的打草机，其特征在于，当所述电机驱动所述打草头转动时，所述输出轴绕第一中心轴线转动，当所述电机处于未驱动打草头转动的非工作状态时，所述输出轴具有第二中心轴线，所述第一中心轴线和第二中心轴线构成锐角夹角，且所述锐角夹角的范围为0.4°-3°。
  7. 根据权利要求1所述的打草机，其特征在于，所述电机为外转子电机，所述电机的转子的顶壁与所述壳体在轴向上设有第一间隙，所述第一间隙为1.5mm至10mm，所述电机的转子的侧壁和所述壳体内侧壁在径向上设有第二间隙，所述第二间隙为3mm至10mm。
  8. 根据权利要求1所述的打草机，其特征在于，所述动力头还包括：
    第一减振垫，设置在所述电机和所述端盖之间，用于减小所述电机和所述端盖之间的振动传递。
  9. 根据权利要求8所述的打草机，其特征在于，所述电机的定子组件包括定子支架，所述定子支架底部设置有向下延伸的凸出部，所述凸出部用于安装轴承，所述输出轴伸出所述凸出部；
    所述端盖设置有用于与所述凸出部配合的端盖凹槽，所述端盖凹槽底部设置有供所述输出轴穿过的开孔；
    所述第一减振垫在轴向上和径向上均设置在所述凸出部和所述端盖凹槽之间。
  10. 根据权利要求1至9所述的打草机，其特征在于，所述定子组件包括定子支架；
    所述动力头还包括：设于所述壳体上的缺口，以及设于所述定子支架上的凸块，在 所述周向方向上，所述凸块能够与所述缺口的槽壁抵顶，用于对所述定子组件进行周向限位；
    所述敞开端的边缘周向分布有多个装配部，所述端盖和所述装配部通过紧固件紧固连接来对电机进行轴向限位。
  11. 根据权利要求1至7所述的打草机，其特征在于，所述敞开端的边缘周向分布有多个装配部，所述装配部设置有紧固孔；
    所述定子支架的边缘周向分布有多个配接孔；
    所述端盖包括：沉槽，用于与所述壳体的敞开端配合；多个套筒，周向分布在所述沉槽的底部且面向所述壳体，所述套筒向上延伸贯穿所述定子支架的配接孔；
    紧固件，穿过所述紧固孔与所述套筒进行轴向紧固连接。
  12. 根据权利要求11所述的打草机，其特征在于，所述动力头还包括设置在所述套筒的外侧壁和所述配接孔的径向预设间隙。
  13. 根据权利要求11所述的打草机，其特征在于，所述动力头还包括：
    第二减振垫，设置在所述壳体中所述紧固孔和所述紧固件之间，以及所述装配部和所述套筒之间。
  14. 根据权利要求11所述的打草机，其特征在于，所述端盖包括：
    呈环状的紧固座，所述紧固座的中心区域轴向贯通；
    止位结构，位于所述轴向贯通区域的底部，所述紧固座和止位结构构成所述沉槽，多个所述套筒周向分布在所述止位结构的边缘。
  15. 一种打草机，包括打草头及驱动所述打草头转动的动力头，所述动力头还包括：
    壳体，所述壳体包括敞开端；
    端盖，与所述壳体的所述敞开端相连，所述壳体与所述端盖限定出收容腔；
    电机，至少部分收容于所述收容腔，所述电机包括输出轴、转子组件和定子组件，所述定子组件包括定子支架，所述输出轴沿轴向方向延伸且与所述打草头动力连接；其特征在于，当所述电机驱动所述打草头转动时，所述定子支架的最外缘与所述壳体和/或所述端盖之间基本无直接接触，以实现所述电机相对于所述壳体和/或所述端盖在轴向方向与径向方向上发生相对运动。
  16. 根据权利要求15所述的打草机，其特征在于，当所述电机驱动所述打草头转动时，所述输出轴绕第一中心轴线转动，当所述电机处于未驱动打草头转动的非工作状态时，所述输出轴具有第二中心轴线，所述第一中心轴线和第二中心轴线构成锐角夹角，且所述锐角夹角的范围为0.4°-3°。
  17. 根据权利要求15所述的打草机，其特征在于，所述电机为外转子电机，所述电机的转子的顶壁与所述壳体在轴向上设有第一间隙，所述第一间隙为1.5mm至10mm，所述电机的转子的侧壁和所述壳体内侧壁在径向上设有第二间隙，所述第二间隙为3mm至10mm。
  18. 根据权利要求15所述的打草机，其特征在于，所述定子支架的最外缘与所述壳体之间设有轴向预设间隙以及径向预设间隙；
    或者，所述定子支架的最外缘与所述端盖之间设有轴向预设间隙以及径向预设间隙；
    或者，所述定子支架的最外缘与所述壳体和所述端盖之间设有轴向预设间隙以及径向预设间隙。
  19. 根据权利要求15所述的打草机，其特征在于，所述动力头还包括：
    变形体，设置在所述定子支架的最外缘与所述壳体和/或所述端盖之间，使得所述定子支架的最外缘与所述壳体和/或所述端盖之间基本无直接接触。
  20. 根据权利要求19所述的打草机，其特征在于，所述动力头还包括：
    所述变形体设置在所述定子支架的最外缘与所述壳体的轴向和径向之间，或设置在所述定子支架的最外缘与所述端盖的轴向和径向之间，或同时设置在所述定子支架的最外缘与所述壳体以及定子支架的最外缘与所述端盖的轴向和径向之间。
PCT/CN2023/089827 2022-04-21 2023-04-21 打草机 WO2023202707A1 (zh)

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