WO2020253678A1 - 打草机及其打草头 - Google Patents

打草机及其打草头 Download PDF

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Publication number
WO2020253678A1
WO2020253678A1 PCT/CN2020/096353 CN2020096353W WO2020253678A1 WO 2020253678 A1 WO2020253678 A1 WO 2020253678A1 CN 2020096353 W CN2020096353 W CN 2020096353W WO 2020253678 A1 WO2020253678 A1 WO 2020253678A1
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WO
WIPO (PCT)
Prior art keywords
transmission member
spool
mowing
rotation axis
head
Prior art date
Application number
PCT/CN2020/096353
Other languages
English (en)
French (fr)
Inventor
郭建朋
Original Assignee
南京德朔实业有限公司
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 南京德朔实业有限公司 filed Critical 南京德朔实业有限公司
Priority to CA3144111A priority Critical patent/CA3144111A1/en
Priority to EP20826472.1A priority patent/EP3973761A4/en
Priority to AU2020297467A priority patent/AU2020297467B2/en
Publication of WO2020253678A1 publication Critical patent/WO2020253678A1/zh
Priority to US17/551,282 priority patent/US20220104431A1/en
Priority to US18/454,611 priority patent/US20230397527A1/en

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/416Flexible line cutters
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/416Flexible line cutters
    • A01D34/4161Means for feeding cutter line
    • A01D34/4162Means for feeding cutter line automatically
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/416Flexible line cutters
    • A01D34/4166Mounting or replacement of the lines
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D69/00Driving mechanisms or parts thereof for harvesters or mowers
    • A01D69/06Gearings
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D75/00Accessories for harvesters or mowers
    • A01D75/20Devices for protecting men or animals
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D2101/00Lawn-mowers

Definitions

  • the present disclosure relates to a garden tool, for example, to a lawn mower and a lawn mower.
  • the lawn mower can be used for mowing lawns in villas and gardens.
  • the lawn mowers on the market mainly use tapping to pay off the line or the spool and head shell of the mower head are controlled by a switch to generate a differential speed to pay off.
  • the user for the lawn mower in the related technology, the user cannot accurately release the length of the lawn mower according to actual needs. In fact, none of the grass cutters in the related technology can realize automatic pay-off in the true sense.
  • a mowing head with an automatic wire-paying function generally releases the mowing rope by causing a relative rotation between the head shell and the spool.
  • the automatic pay-off of the lawn mower generally requires the outside to input an instruction signal to the mower, and the mower needs to be controlled to pay off the line according to the human judgment of the operator. That is, when the operator observes that the length of the mowing rope changes and the mowing efficiency is reduced, the mowing machine is manually controlled to pay off. This includes the control of the mowing machine to accelerate or decelerate through the pay off switch to realize the connection between the head shell and the spool.
  • the speed difference between the head and the spool can be used to pay off, or the speed difference between the head shell and the spool can be achieved by hitting the grass head.
  • the mower head will produce a large speed difference when it is driven, and generally produce a speed difference of more than 30%, so as to realize the difference between the head shell and the spool.
  • some lawn mowers with automatic pay-off function in related technologies they are set to cause a speed difference between the head shell and the spool to achieve pay-off when the mower is turned on and off. Actually, effective and reliable pay-off is required.
  • a sensor is installed inside the mowing head to sense the length of the mowing rope and transmit the signal to the control unit to control the realization of the acceleration or deceleration of the mowing head. It also requires the mowing head It has a large speed difference, and the speed difference is generally required to be more than 30%, and the grass cutter that senses the signal and controls the pay-off through the sensor is not reflected in the related technology products, and it is obtained through multi-party demonstration In the actual pay-off process, there will generally be situations where the line cannot be put out or the line is too long, its reliability is extremely poor, and it cannot adapt to the more complicated working conditions of the lawn mower.
  • the present disclosure provides a mowing machine and mowing head with high pay-off reliability and high operating convenience.
  • An embodiment provides a lawn trimmer, including: a trimming head; a driving device, including a motor for driving the trimming head to rotate around a rotation axis; the trimming head includes: a spool for winding the trimming rope; a head shell, A accommodating space is formed, and the spool is at least partially accommodated in the accommodating space; a transmission member is mounted to the spool, and the transmission member includes a driving part for driving the head housing to rotate synchronously with the spool; the head housing is formed with a matching part for cooperating with the driving part;
  • the mating part is formed with a mating surface for contacting with the driving part to apply a reaction force to the driving part, and a reset surface for contacting with the driving part to apply a reaction force to the driving part; when the driving part is engaged with the mating surface, The grass head is in the working state; when the driving part is matched with the reset surface, the cutting head is in the autonomous pay-off state; when the cutting head is in the autonomous pay-off state and the driving
  • the ratio of the absolute value of the difference between the first rotational speed and the second rotational speed to the first rotational speed is greater than or equal to 0 and less than or equal to 0.1.
  • the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed to the first rotation speed is greater than or equal to 0 and less than or equal to 0.15.
  • the mowing rope has an effective length extending from the containing space, and the mowing rope has a preset value within the effective length range; when the effective length of the mowing rope is greater than the preset value, the transmission member is in the first A position; when the effective length of the mowing rope is less than the preset value, the transmission member is in the second position.
  • the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; the matching part includes first teeth distributed around the rotation axis; the head shell is formed or connected There are second teeth that can be used to reset the transmission; the first teeth and the second teeth are staggered around the axis of rotation; in a circumferential range around the axis of rotation, the second teeth have tooth surfaces that are distributed toward the axis of rotation, and the tooth surfaces have Rotating axis and gradual reset surface.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the rotation axis, and the limit part is symmetrically arranged about a symmetric plane passing through the first straight line; the limit part forms a sliding rail for the transmission member to slide.
  • the limiting member and the limiting portion include at least two contact surfaces.
  • the transmission member when the mowing head is driven by the motor to rotate around the rotation axis, the transmission member has a friction force in a straight line direction perpendicular to the rotation axis relative to the spool, and the friction force is opposite to the centrifugal force generated by the transmission member.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a lawn trimmer, including: a trimming head; a driving device, including a motor for driving the trimming head to rotate around a rotation axis; the trimming head includes: a spool for winding the trimming rope; a head shell, A accommodating space is formed, and the spool is at least partially accommodated in the accommodating space; the linkage device is used for linkage between the spool and the head shell; wherein, the linkage device includes: a transmission member that prevents the spool from being opposed to the head shell The first position of rotation and the second position that allows relative rotation between the spool and the head shell; wherein, when the transmission member is in the first position, the mowing head is in the mowing state, and the motor has the first rotational speed; In the second position, the mowing head is in the state of autonomous spooling, the motor has a second rotation speed, and the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed to the first rotation speed is greater than or equal to 0 and less
  • the ratio of the absolute value of the difference between the first rotational speed and the second rotational speed to the first rotational speed is greater than or equal to 0 and less than or equal to 0.1.
  • the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed to the first rotation speed is greater than or equal to 0 and less than or equal to 0.15.
  • the mowing rope has an effective length extending from the containing space, and the mowing rope has a preset value within the effective length range; when the effective length of the mowing rope is greater than the preset value, the transmission member is in the first A position; when the effective length of the mowing rope is less than the preset value, the transmission member is in the second position.
  • the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; the matching part includes first teeth distributed around the rotation axis; the head shell is formed or connected There are second teeth that can be used to reset the transmission; the first teeth and the second teeth are staggered around the axis of rotation; in a circumferential range around the axis of rotation, the second teeth have tooth surfaces that are distributed toward the axis of rotation, and the tooth surfaces have Rotating axis and gradual reset surface.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the rotation axis, and the limit part is symmetrically arranged about a symmetric plane passing through the first straight line; the limit part forms a sliding rail for the transmission member to slide.
  • the limiting member and the limiting portion include at least two contact surfaces.
  • the transmission member when the mowing head is driven by the motor to rotate around the rotation axis, the transmission member has a friction force in a straight line direction perpendicular to the rotation axis relative to the spool, and the friction force is opposite to the centrifugal force generated by the transmission member.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a lawn trimmer, including: a trimming head; a driving device, including a motor for driving the trimming head to rotate around a rotation axis; the trimming head includes: a spool for winding the trimming rope; a head shell, A accommodating space is formed, and the spool is at least partially accommodated in the accommodating space; the transmission member has a first position relative to the spool that prevents relative rotation between the spool and the head housing and a second position that allows relative rotation between the spool and the head housing; Among them, when the transmission member is in the first position, the mowing head is in working condition, and the transmission member rotates around the axis of rotation synchronously with the spool; when the transmission member is in the second position, the mowing head is in the state of autonomous wire-releasing, and the spool and the head Relative rotation is generated between the shells to release the mowing rope; wherein the center of mass of the transmission member deviates from the axis of rotation.
  • the transmission member When the mowing head is driven to rotate by the motor, the transmission member is subject to a tendency to move from the first position to the second position.
  • the head shell rotates around the rotation axis, it also applies resistance to the transmission member to prevent the transmission member from moving from the first position to the second position; when the cutting head is in the cutting state and the cutting rope extends to
  • the resistance applied by the head shell to the transmission member is reduced to make the transmission member move from the first position to the second position under the action of centrifugal force.
  • the transmission member when the effective length of the mowing rope is greater than the preset value, the transmission member is in the first position; when the effective length of the mowing rope is less than the preset value, the transmission member is in the second position.
  • the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; the matching part includes first teeth distributed around the rotation axis; the head shell is formed or connected There are second teeth that can be used for resetting the transmission member; the first teeth and the second teeth are staggered around the rotation axis.
  • the second tooth has a tooth surface distributed toward the rotation axis, and the tooth surface has a gradual return surface facing the rotation axis.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the axis of rotation, and the limit part is symmetrically arranged about a symmetrical plane passing through the first straight line; the limit part forms a sliding rail for the transmission member to slide.
  • the limiting member and the limiting portion include at least two contact surfaces.
  • the transmission member when the mowing head is driven by the motor to rotate around the first axis, the transmission member has a friction force in a linear direction perpendicular to the first axis relative to the spool, and the friction force is opposite to the centrifugal force generated by the transmission member.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a mowing head suitable for mowing machines and capable of being driven to rotate around a rotation axis to achieve mowing.
  • the mowing head includes: a spool for winding mowing ropes; a head shell surrounded by The accommodating space for accommodating at least a part of the spool; the transmission member, relative to the spool, has a first position that prevents relative rotation between the spool and the head housing and a second position that allows relative rotation between the spool and the head housing; when the transmission member is in the first position In position, the transmission member rotates around the rotation axis synchronously with the spool, and the mowing head is in the state of mowing; when the driving member is in the second position, relative rotation between the spool and the head shell is generated to release the mowing rope; The center of gravity deviates from the axis of rotation.
  • the transmission member When the mowing head rotates, the transmission member is subjected to a centrifugal force that makes itself have a tendency to move from the first position to the second position.
  • the transmission member When the head shell rotates around the rotation axis, the transmission member also applies centrifugal force against the transmission member.
  • the resistance that prevents the transmission member from moving from the first position to the second position; when the cutting head is in the cutting state and the length of the effective part of the cutting rope extending beyond the head shell is less than the preset value, the head shell is applied to The resistance of the transmission member is reduced to make the transmission member move from the first position to the second position under the action of centrifugal force.
  • the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; the matching part includes first teeth distributed around the rotation axis; the head shell is formed or connected There are second teeth that can be used to reset the transmission; the first teeth and the second teeth are staggered around the axis of rotation; in a circumferential range around the axis of rotation, the second teeth have tooth surfaces that are distributed toward the axis of rotation, and the tooth surfaces have Rotating axis and gradual reset surface.
  • An embodiment provides a lawn trimmer, including: a trimming head for trimming grass; a driving device including a motor for driving the trimming head to rotate around a rotation axis; and the trimming head includes: a spool for winding the trimming grass Rope;
  • the head shell is formed with an accommodation space, and the spool is at least partially accommodated in the accommodation space; the linkage device is used to realize the transmission of power between the spool and the head shell.
  • the lawn mower has a lawn mower state, and the mower is in In the working state, the linkage device drives the spool or the head shell to rotate in the first rotation direction around the rotation axis; wherein the linkage device includes: a transmission member having a first position that prevents the spool from rotating relative to the head shell in the first rotation direction and allows the spool The second position relative to the head shell rotating in the first rotation direction; the trimming head also has an automatic winding state and an autonomous pay-off state; when the trimming head is in the automatic winding state, the motor drives the spool to rotate relative to the head shell in the second position Rotate the mowing rope to the spool; when the mowing head is in the state of auto-paying off, the transmission member moves to the second position, and the spool rotates in the first rotation direction relative to the head shell to release the mowing rope; When the grass head is driven to rotate by the motor, the transmission member is subjected to a centrifugal force that makes it have a tendency to move from the
  • the head shell When the head shell rotates around the rotation axis, it also exerts a centrifugal force against the transmission member to prevent the transmission member from being moved from the first position. Resistance to movement from one position to the second position; when the mowing head is in working condition and the length of the effective part of the mowing rope extending beyond the head shell is less than the preset value, the resistance applied by the head shell to the transmission member is reduced In order to make the transmission member move from the first position to the second position under the action of centrifugal force.
  • it further includes a damping device for damping at least one of the spool and the head housing to make the lawn mower in an automatic winding state.
  • the damping device includes: a damping element for preventing the wire axis from rotating in the first direction; and the head shell rotates in the first direction in the automatic winding state.
  • the damping device includes: a damping element for preventing the head shell from rotating in the second direction; in the automatic winding state, the wire shaft rotates in the second direction.
  • the transmission member includes a driving part for driving the head housing to rotate synchronously with the spool;
  • the head housing is formed with a matching part for cooperating with the driving part;
  • the mating portion includes first teeth distributed around the rotation axis; the head shell is formed with or connected with second teeth for resetting the transmission member; the first teeth and the second teeth are staggered around the rotation axis;
  • the second tooth In a circumferential range around the rotation axis, the second tooth has a tooth surface distributed toward the rotation axis, and the tooth surface has a gradual return surface facing the rotation axis.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the rotation axis, and the limit part is symmetrically arranged about a symmetric plane passing through the first straight line; the limit part forms a sliding rail for the transmission member to slide.
  • the limiting member and the limiting portion include at least two contact surfaces.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a mowing head suitable for mowing machines and capable of being driven to rotate around a rotation axis to achieve mowing.
  • the mowing head includes: a spool for winding mowing ropes; and a head shell forming an accommodation space , The spool is at least partially accommodated in the accommodating space; the transmission member is installed to the spool, the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; wherein, the matching part A mating surface for contacting the driving part to apply a reaction force to the driving part is formed.
  • the mating surface extends in a first plane, the first plane is substantially parallel to the rotation axis, and the distance between the rotation axis and the first plane is greater than zero.
  • the distance between the rotation axis and the first plane is greater than 0 and less than or equal to 20 mm.
  • the mating surface includes an effective surface capable of exerting a reaction force, the effective surface having a projection line in a plane perpendicular to the rotation axis, the projection line including the first limit position and the second limit position, the first limit position
  • the central angle between the second extreme position and the axis of the rotation axis is greater than 0° and less than or equal to 45°.
  • the central angle between the first extreme position and the second extreme position and the axis of the rotation axis is greater than or equal to 3° and less than or equal to 40°.
  • the transmission member relative to the spool has a first position that prevents relative rotation between the spool and the head shell and a second position that allows relative rotation between the spool and the head shell;
  • the mowing rope has a self-contained space extending out Effective length, the mowing rope has a preset value within the effective length range; when the effective length of the mowing rope is greater than the preset value, the transmission member is in the first position; when the effective length of the mowing rope is less than the preset value When the transmission member is in the second position.
  • the mating portion includes first teeth distributed around the rotation axis; the head shell is formed with or connected with second teeth for resetting the transmission member; the first teeth and the second teeth are staggered around the rotation axis.
  • the second tooth has a tooth surface distributed toward the rotation axis, and the tooth surface has a gradual return surface facing the rotation axis.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the line connecting the tooth tip and the tooth bottom of the second tooth to the rotation axis 101 is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the rotation axis, and the limit part is symmetrically arranged about a symmetric plane passing through the first straight line; the limit part forms a sliding rail for the transmission member to slide.
  • the limiting member and the limiting portion include at least two contact surfaces.
  • An embodiment provides a mowing head suitable for mowing machines and capable of being driven to rotate around a rotation axis to achieve mowing.
  • the mowing head includes: a spool for winding mowing ropes; and a head shell forming an accommodation space , The spool is at least partially accommodated in the accommodating space; the transmission member is installed to the spool, the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; wherein, the matching part A mating surface for contact with the driving part to apply a reaction force to the driving part is formed.
  • the mating surface includes an effective surface capable of applying a reaction force.
  • the effective surface has a projection line in a plane perpendicular to the axis of rotation, and the projection line includes The first limit position and the second limit position, the central angle between the first limit position and the second limit position and the axis of the rotation axis is greater than 0° and less than or equal to 45°.
  • the central angle between the first extreme position and the second extreme position and the axis of the rotation axis is greater than or equal to 3° and less than or equal to 40°.
  • the transmission member relative to the spool has a first position that prevents relative rotation between the spool and the head shell and a second position that allows relative rotation between the spool and the head shell;
  • the mowing rope has a self-contained space extending out Effective length, the mowing rope has a preset value within the effective length range; when the effective length of the mowing rope is greater than the preset value, the transmission member is in the first position; when the effective length of the mowing rope is less than the preset value When the transmission member is in the second position.
  • the mating portion includes first teeth distributed around the rotation axis; the head shell is formed with or connected with second teeth for resetting the transmission member; the first teeth and the second teeth are staggered around the rotation axis.
  • the second tooth has a tooth surface distributed toward the rotation axis, and the tooth surface has a gradual return surface facing the rotation axis.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the rotation axis, and the limit part is symmetrically arranged about a symmetric plane passing through the first straight line; the limit part forms a sliding rail for the transmission member to slide.
  • the limiting member and the limiting portion include at least two contact surfaces.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a mowing head suitable for mowing machines and capable of being driven to rotate around a rotation axis to achieve mowing.
  • the mowing head includes: a spool for winding mowing ropes; and a head shell forming an accommodation space , The spool is at least partially accommodated in the accommodating space; the transmission member is installed to the spool, the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; wherein, the matching part A mating surface for contact with the driving part to apply a reaction force to the driving part is formed.
  • the mating surface has a projection line in a plane perpendicular to the rotation axis.
  • the projection line includes a first limit position and a first limit position that can apply a reaction force to the driving part.
  • the mating surface includes an effective surface capable of exerting a reaction force, and the effective surface is set between the first limit position and the second limit position.
  • An embodiment provides a mowing head suitable for mowing machines and capable of being driven to rotate around a rotation axis to achieve mowing.
  • the mowing head includes: a spool for winding mowing ropes; and a head shell forming an accommodation space , The spool is at least partially accommodated in the accommodating space; the transmission member is installed to the spool, the transmission member includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed with a matching part for matching with the driving part; wherein, the matching part A mating surface for contacting with the driving part to apply a reaction force to the driving part and a reset surface for contacting the driving part to apply a reaction force to the driving part are formed; when the driving part is engaged with the mating surface, the mowing head is in operation State; when the driving part is matched with the reset surface, the trimming head is in the state of autonomous pay-off; when the trimming head is in the autonomous payoff state and the drive part is matched with
  • the angle formed by the tangent of the first circle at the first extreme position and the tangent of the second circle at the second extreme position is less than or equal to 30°.
  • the transmission member has a first position relative to the spool to prevent relative rotation between the spool and the head shell and a second position to allow relative rotation between the spool and the head shell;
  • the mowing rope has an effective length extending from the containing space, and the mowing rope has a preset value within the effective length range; when the effective length of the mowing rope is greater than the preset value, the transmission member is in the first position; When the effective length of the mowing rope is less than the preset value, the transmission member is in the second position.
  • the mowing rope when the driving part moves to the first limit position and the second limit position, the mowing rope has a reaction force acting on the head shell, and the reset surface has the first component force for pushing the transmission member to reset and the mowing rope The second component of the opposite reaction force acting on the head shell.
  • the mating portion includes first teeth distributed around the rotation axis, the first teeth forming or connected with a mating surface; the head shell is formed or connected with a second tooth for resetting the transmission member, and the second tooth is formed or connected with a reset Surface; the first teeth and the second teeth are staggered around the axis of rotation.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the axis of rotation, and the limit part is symmetrically arranged about a symmetrical plane passing through a straight line; the limit part forms a sliding rail for the transmission part to slide, and is perpendicular to In the linear direction of the rotation axis, the limiting member and the limiting portion include at least two contact surfaces.
  • the transmission member when the mowing head is driven by the motor to rotate around the rotation axis, the transmission member has a friction force in a straight line direction perpendicular to the rotation axis relative to the spool, and the friction force is opposite to the centrifugal force generated by the transmission member.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a mowing head suitable for mowing machines and capable of being driven to rotate around a rotation axis to achieve mowing.
  • the mowing head includes: a spool for winding mowing ropes; and a head shell forming an accommodation space , The spool is at least partially accommodated in the accommodating space; the linkage device is used to achieve power transmission between the spool and the head shell; wherein the head shell is formed with an outer threading hole for inserting the mowing rope into the spool, and the spool is formed with energy
  • the mowing rope inserted into the head shell from the outer threading hole is connected to the joint part of the spool;
  • the linkage device includes: a transmission part, which is installed to the spool, and the transmission part includes a driving part for driving the head shell to rotate synchronously with the spool; the head shell is formed There is a matching part for matching with the driving part; when the cutting head rotates around the rotation axis, and when the transmission
  • a force is applied to the driving part, and the force is decomposed into a first component force along the direction perpendicular to the straight line and a second component force along the straight line direction opposite to the direction of the centrifugal force to prevent the transmission member from moving in the straight direction.
  • the spool is formed with an inner threading hole, and when the outer threading hole and the inner threading hole are located in the same radial direction, the mowing rope can pass through the outer threading hole and the inner threading hole in sequence.
  • the joint is a threading channel
  • the transmission channel penetrates the spool and connects any two inner threading holes on the spool.
  • the threading channel extends along a curve.
  • the transmission member includes a driving part for driving the head housing to rotate synchronously with the spool;
  • the head housing is formed with a matching part for cooperating with the driving part;
  • the mating portion includes first teeth distributed around the rotation axis; the head shell is formed with or connected with second teeth for resetting the transmission member; the first teeth and the second teeth are staggered around the rotation axis; Within the circumferential range of the second tooth, the second tooth has a tooth surface distributed toward the rotation axis, and the tooth surface has a gradual convex portion facing the rotation axis.
  • the tooth surface includes a first section and a second section.
  • the first section and the tooth surface of the first tooth away from the rotation axis form a section for the transmission member to move in a radial direction perpendicular to the rotation axis.
  • the second section and the tooth surface of the first tooth away from the rotation axis form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • a limit part is formed on the spool to limit the rotation of the transmission member around the axis of rotation, and the limit part is symmetrically arranged about a symmetrical plane passing through a straight line; the limit part forms a sliding rail for the transmission part to slide, and is perpendicular to In the linear direction of the rotation axis, the limiting member and the limiting portion include at least two contact surfaces.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • An embodiment provides a mowing head, which includes: a spool for winding mowing rope; a head shell formed with an accommodation space, and the spool is at least partially accommodated in the accommodation space; a linkage device used between the spool and the head shell The power transmission is realized; the head shell is formed with an outer threading hole for inserting the mowing rope into the spool, and the spool is formed with a joining part for the mowing rope inserted into the head shell from the outer threading hole to be coupled to the spool; the linkage device includes: The transmission member has a first position relative to the spool to prevent relative rotation between the spool and the head shell and a second position to allow relative rotation between the spool and the head shell; when the transmission member is in the first position, the mowing head is in operation In the state, the transmission member rotates around the axis of rotation synchronously with the spool; when the transmission member is in the second position, the mowing head is in the state of autonomous wire
  • the transmission member is mounted to the spool, and the transmission member includes a driving part for driving the head housing to rotate synchronously with the spool; the head housing is formed with a matching part for cooperating with the driving part; when the mowing head rotates around the rotation axis, When the transmission member rotates with the spool around the axis of rotation, the transmission member generates a centrifugal force along a straight line.
  • the mating part contacts the driving part and applies a force to the driving part.
  • the force is decomposed into the first component force and the first component in the direction perpendicular to the straight line.
  • a second component force along the straight line direction and opposite to the direction of the centrifugal force to prevent the transmission member from moving in the straight line direction.
  • the spool is formed with an inner threading hole, and when the outer threading hole and the inner threading hole are located in the same radial direction, the mowing rope can pass through the outer threading hole and the inner threading hole in sequence.
  • the joint is a threading channel
  • the transmission channel penetrates the spool and connects any two inner threading holes on the spool.
  • the threading channel extends along a curve.
  • the transmission member when the mowing head is driven by the motor to rotate around the rotation axis, the transmission member has a friction force in a straight line direction perpendicular to the rotation axis relative to the spool, and the friction force is opposite to the centrifugal force generated by the transmission member.
  • the mating portion includes first teeth distributed around the rotation axis, and the first teeth form or are connected with a mating surface;
  • the head shell is formed or connected with a second tooth which can be used for resetting the transmission member, and the second tooth is formed or connected with a reset surface; the first tooth and the second tooth are staggeredly distributed around the rotation axis.
  • the restoring surface includes a first section and a second section, the first section and the driving part basically do not generate an interaction force;
  • the first tooth includes a tooth surface that intersects the mating surface and is away from the rotation axis, and the second The section and the tooth surface form a guide channel for the transmission member to rotate around the rotation axis.
  • the central angle ⁇ formed by the tooth tip and the tooth bottom of the second tooth and the axis of the rotation axis is greater than or equal to 30° and less than or equal to 50°.
  • the spool is also formed or connected with a containing groove, and a biasing element is arranged in the containing groove, one end of the biasing element abuts against the bottom of the containing groove, and the other end against the transmission member.
  • the cutting head itself By setting the transmission part matched with the driving part and purely mechanical cooperation, the cutting head itself will automatically pay off when the cutting rope is shortened to the preset length to meet the length requirements of the cutting rope during cutting, without manual intervention Judging the conditions of the line-up has improved the reliability and convenience of the line-up of the lawn mower.
  • Figure 1 is a perspective view of the lawn mower
  • Figure 2 is a cross-sectional view of the grass trimmer of Figure 1;
  • FIG. 3 is an exploded view of the mowing head of the mowing machine in FIG. 1;
  • FIG. 4 is an exploded view from another perspective of the mowing head of the mowing machine in FIG. 3;
  • Figure 5 is a cross-sectional view of the spool of the lawn mower in Figure 3;
  • Fig. 6 is a perspective view of the spool and transmission member of the lawn mower in Fig. 3;
  • Figure 7 is a top view of the head shell, spool and transmission parts of the lawn mower in Figure 3;
  • Figure 8 is a cross-sectional view of the head shell, spool and transmission member of the lawn mower in Figure 3;
  • Figure 9 is a top view of the head shell of the lawn mower in Figure 3.
  • Fig. 10 is a force analysis diagram at any point on the first tooth of the head shell of the lawn mower in Fig. 9;
  • FIG. 11 is a cross-sectional view of the head shell, spool and transmission member of the lawn mower in FIG. 3 and the transmission member is located between the first tooth and the second tooth;
  • FIG. 12 is a cross-sectional view of the head shell, spool and transmission member of the lawn mower in FIG. 3 and the transmission member is pushed back by the second tooth;
  • Fig. 13 is a cross-sectional view of the head shell, spool and transmission member of the lawn mower in Fig. 12 when the transmission member is pushed back by the second tooth, and a part of the first tooth and the second tooth are deleted.
  • the lawn mower 100 shown in FIG. 1 includes a lawn mower 11, a driving device 12, an operating device 13 and a connecting device 14.
  • the mowing head 11 is used to install a mowing rope 15 to achieve the mowing function.
  • the driving device 12 is used to provide rotational power to the mowing head 11.
  • the driving device 12 includes a motor 122 and a first housing 121.
  • the motor 122 is arranged in the first housing 121.
  • the motor 122 drives the mowing head 11 to rotate the axis 101. It is the axis rotation.
  • the operating device 13 includes a handle 131, an auxiliary handle 132, a main switch 133, and a second housing 134.
  • the handle 131 and the auxiliary handle 132 are used for the user's hands to hold respectively, so that the lawn mower 100 can be operated more stably.
  • the main switch 133 may be arranged on the handle 131, and the user can directly operate the main switch 133 to control the lawn mower 100 to cut grass when holding the handle 131.
  • the second housing 134 is used to form a joint part that combines the power supply device.
  • the joint part can be combined with a battery pack to supply power to the lawn mower 100.
  • the handle 131 and the second housing 134 are formed separately.
  • the handle can also be integrally formed with the second housing.
  • the connecting device 14 includes a connecting rod for connecting the first housing 121 and the second housing 134.
  • the auxiliary handle 132 is also installed to the connecting rod, and the auxiliary handle 132 is also located between the first housing 121 and the second housing 134.
  • the lawn mower 100 further includes a shield 16, which is at least partially distributed around the lawn mower 11, which can prevent grass clippings from flying into the direction in which the user operator is standing when the lawn mower 11 controls the lawn.
  • the upper side and the lower side as shown in FIG. 1 are also defined, wherein the driving device 12 is arranged on the upper side of the mowing head 11, and the mowing head 11 is arranged below the driving device 12. side.
  • the mowing head 11 also includes a head shell 111, a spool 112 and a linkage 113.
  • the head shell 111 is formed with an accommodating space 114 that can accommodate at least a part of the spool 112 around the rotation axis 101.
  • One side of the head shell 111 forming the accommodating space 114 is the inner side of the head shell 111, and the other side of the head shell 111 opposite to the inner side is Outside.
  • the spool 112 is disposed in the accommodating space 114, that is, the spool 112 is disposed inside the head housing 111.
  • the spool 112 is used to wind the mowing rope 15, and the mowing rope 15 is used for mowing.
  • the head shell 111 is also formed with outer threading holes 111 a for the mowing rope 15 to extend to the outside of the head shell 111, and the number of the outer threading holes 111 a is two.
  • the spool 112 is also formed with an inner threading hole 112a.
  • the spool 112 is also formed with a threading channel 112d connecting the two inner threading holes 112a and allowing the mowing rope 15 to pass through.
  • the threading channel 112d connects any two inner threading holes on the spool, and the threading channel is arranged to extend along a curve.
  • the user can insert the mowing rope 15 through the outer threading hole 111a into the containing space 114, and then pass through the inner threading hole 112a through the threading channel 112d from the outer threading hole 111a on the opposite side Pass out to the outside of the head shell 111.
  • the mowing rope 15 needs to be wound around the spool 112, the user does not need to open the head shell 111. It is possible to directly extend the mowing rope 15 into the head shell 111 and then wind the mowing rope 15 on the spool 112 through the relative rotation of the spool 112 and the head shell 111.
  • Such a mowing head 11 is usually called an externally inserted winding. Grass head.
  • the part of the mowing rope 15 extending through the outer threading hole 111a to the outside of the head shell 111 is defined as the effective part of the mowing rope 15, and the effective part of the mowing rope 15 cuts weeds by high-speed rotation.
  • the length of the effective part of the mowing rope 15 can reach a preset value, that is, the length of the effective part of the mowing rope 15 must be greater than or equal to the predetermined value. Set value.
  • the length of the effective part of the mowing rope 15 is less than the preset value, the mowing efficiency of the mowing rope 15 may be reduced because the effective part of the mowing rope 15 is relatively short.
  • the mowing machine 100 in this embodiment can realize that when the length of the effective part of the mowing rope 15 is lower than the preset value At this time, the linkage device 113 controls the mowing rope 15 to automatically pay off to a length interval greater than or equal to the preset value.
  • the effective part of the mowing rope 15 is actually less than or equal to a limit value. When the mowing rope 15 is within this limit, on the one hand, it can effectively mowing grass and maintain a high mowing efficiency; on the other hand, the mowing rope 15 does not interfere with the shield 16, so that mowing can be continued.
  • the linkage device 113 is used to control whether the trimming head 11 is paid out.
  • the linkage device 113 has a first equilibrium state that makes the trimming head 11 unable to pay off. At this time, the trimming head 11 is in the working state; the linkage device 113 also has The grass head 11 is in the second equilibrium state where the line can be laid out. At this time, the grass head 11 is in the state of self-paying line.
  • the linkage device 113 can autonomously recognize the effective length of the mowing rope 15, and can automatically adjust the mowing head 11 to enter the first equilibrium state or the second equilibrium state according to the length of the effective part of the mowing rope 15, namely Adjust the mowing head 11 to autonomously enter the working state or autonomously pay off the line.
  • the linkage device 113 autonomously recognizes and adjusts the working state of the mowing head 11 is based on the linkage device 113 itself, and it does not need to accept the instruction signal of line setting or mowing input from the outside.
  • the indication signal mentioned here includes a signal that causes the linkage device 113 to switch modes due to external force, electrical signal, magnetic force, or other force generated by the outside on the cutting head 11. In some common indication signals, it generally includes: knocking the shell of the grass head 11 to make the spool 112 and the head shell 111 produce a speed difference to pay off; the speed of the switch is adjusted to make the spool 112 and the head shell 111 produce a speed difference.
  • the sensor induces the current change in the motor to cause a speed difference between the spool 112 and the head shell 111 to pay off.
  • the cutting head 11 in this embodiment has a constant rotation speed, and it does not need to adjust the rotation speed of the motor 122 to cause the spool 112 to produce a rotation speed change to obtain the speed difference between the head housing 111 and the spool 112 to pay off.
  • the linkage 113 when the linkage 113 is in the first equilibrium state, the spool 112 and the head housing 111 are relatively static, so that the spool 112 and the head housing 111 will be driven by the motor shaft 122a to rotate synchronously, so that at this time
  • the length of the mowing rope 15 wound on the bobbin 112 that extends from the effective part of the head shell 111 does not change, that is, the mowing rope 15 cannot be released, and the mowing head 11 is in a normal working state.
  • the linkage 113 includes a transmission member 113a, which can move freely between the bobbin 112 and the head housing 111.
  • the transmission member 113a rotates synchronously with the spool 112, and the transmission member 113a is in the first position, and the transmission member 113a also cooperates with the head housing 111 to drive the head housing 111 to rotate synchronously with the spool 112 , And the motor has the first rotational speed at this time; and when the linkage 113 is in the second equilibrium state, the transmission member 113a rotates with the spool 112, and the transmission member 113a is out of cooperation with the head shell 111, and the transmission member 113a is in the second state.
  • the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed of the motor 122 to the first rotation speed is greater than or equal to 0 and less than or equal to 0.15.
  • the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed of the motor 122 to the first rotation speed is greater than or equal to 0 and less than or equal to 0.1.
  • the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed of the motor 122 to the first rotation speed is greater than or equal to 0 and It is less than or equal to 0.05, and the ratio of the absolute value of the difference between the first rotation speed and the second rotation speed of the motor 122 to the first rotation speed approaches zero infinitely.
  • the cutting head 11 is still in the aforementioned uniform rotation range from the first speed to the second speed, and the cutting head 11 is switched between the autonomous pay-off state and the working state. It does not depend on the aforementioned speed changes.
  • the transmission member 113a is arranged between the bobbin 112 and the head housing 111 along the direction of the straight line 102.
  • the motor shaft 122a and the spool 112 rotate synchronously.
  • the transmission member 113a is provided with a transmission hole through which the spool 112 is sleeved and can rotate synchronously with the spool 112. In this way, when the motor shaft 122a drives the spool 112 to rotate, the transmission member 113a can rotate with the spool 112 synchronously.
  • the spool 112 is also formed or connected to a limiting portion 112b, and the limiting portion 112b can limit the circumferential displacement of the transmission member 113a around the rotation axis 101 direction.
  • the limiting portion 112b is a pair of protrusions arranged symmetrically with respect to a symmetrical plane passing through the straight line 102, and the transmission member 113a can be limited within the range of the limiting portion 112b when it is sleeved to the spool 112 along the direction of the rotation axis 101. And it can only produce radial displacement in a straight line direction perpendicular to the rotation axis 101.
  • the transmission member 113a is asymmetrical in mass distribution with respect to the symmetry plane passing through the rotation axis 101.
  • the center of mass G of the transmission member 113a deviates from the rotation axis 101, so that when the cutting head 11 is driven to rotate by the motor 122, the transmission member 113a is subjected to a centrifugal force that makes it have a tendency to move from the first position to the second position.
  • the head shell 111 rotates around the rotation axis 101, it also applies centrifugal force against the transmission member 113a to prevent the transmission member from moving from the first position to the second position. Resistance of the movement.
  • a biasing element 113b is also provided between the transmission member 113a and the spool 112, and the biasing element 113b may be a coil spring.
  • a receiving groove 112c is formed extending on the spool 112, and the coil spring is at least partially disposed in the receiving groove 112c.
  • One end of the coil spring abuts against the bottom of the receiving groove 112c and the other end against the transmission member 113a.
  • the center of gravity of the transmission member 113 a and the coil spring are arranged on both sides of the rotation axis 101.
  • the limiting portion 112b and the receiving groove 112c cooperate to form a sliding rail for the transmission member 113a to slide, that is, the transmission member 113a also forms a sliding connection with the spool 112.
  • the transmission member 113a When the transmission member 113a rotates with the spool 112, the transmission member 113a Centrifugal force will be generated, and the transmission member 113a is also subjected to the biasing force of the biasing element 113b.
  • the direction of the biasing force and the centrifugal force are opposite.
  • the direction of the centrifugal force and the biasing force can optionally be in the direction of the straight line 102.
  • the transmission member 113a and the spool 112 The direction constituting the sliding may also be along the straight line 102 direction.
  • the center of gravity of the transmission member 113a and the biasing element 113b are respectively arranged on two sides of a plane passing through the rotation axis 101 and perpendicular to the straight line 102.
  • the transmission member 113a when the transmission member 113a moves in the direction of the straight line 102 relative to the spool 112, it is also affected by the friction force between the transmission member 113a and the spool 112, which can effectively prevent the biasing element 113b from overcoming the centrifugal force. , To avoid the excessive flexibility of the linkage device 113 leading to misplacement.
  • the head housing 111 forms the above-mentioned accommodation space 114 around the rotation axis 101
  • the spool 112 is at least partially disposed in the accommodation space 114 formed by the head case 111
  • the transmission member 113a is at least partially located The accommodation space 114.
  • an upper bottom 111b is formed on the end of the head shell 111 near the motor 122 in the direction of the rotation axis 101.
  • the upper bottom 111b does not enclose the accommodating space 114, and the accommodating space 114 is partially opened upward, so that the motor shaft 122a passes through the upper bottom 111b.
  • the transmission member 113a Extending into the receiving space 114, the transmission member 113a partially protrudes out of the head shell 111.
  • the head shell 111 is also formed with a matching portion 111c that can be driven by the transmission member 1113a, and the transmission member 113a is formed with a driving portion 113c that cooperates with the matching portion 111c.
  • the driving part 113c is matched with the mating part 111c, a force can be transmitted between the transmission member 113a and the head shell.
  • the mating portion 111c includes a mating surface 111d and a reset surface 111e, wherein the mating surface 111d is used to contact the driving portion 113c to apply a reaction force to the driving portion 113c; the reset surface 111e is used to contact the driving portion 113c to drive
  • the driving part 113c cooperates with the mating surface 111d
  • the mowing head 11 is in a working state
  • the driving part 113c is mated with the reset surface 111e
  • the mowing head 11 is in an autonomous pay-off state.
  • the upper bottom 111b extends toward the motor 122 to form an inner ring and an outer ring. Both the inner ring and the outer ring are formed around the rotation axis 101.
  • the inner ring is formed with first teeth 111f and 111f They are external teeth formed on the inner ring and protruding toward the outer ring, the outer ring is formed with second teeth 111g, and the second teeth 111g are internal teeth formed on the outer ring and protruding toward the inner ring.
  • the first tooth 111f constitutes or forms the aforementioned mating surface 111d
  • the second tooth 111g constitutes or forms the aforementioned return surface 111e.
  • the number of first teeth 111f is multiple, and the number of second teeth 111g is also multiple.
  • the first teeth 111f and the second teeth 111g are staggered from each other, that is, In other words, the first tooth 111f and the second tooth 111g are not arranged in a diameter direction perpendicular to the rotation axis 101 at the same time.
  • the driving portion 113c on the transmission member 113a may be configured as an occlusal tooth that cooperates with the first tooth 111f and the second tooth 111g.
  • the driving portion 113c and the biasing element 113b are respectively arranged on both sides of the transmission member 113a, that is, the center of mass of the driving portion 113c and the transmission member 113a are arranged on the same side of the rotation axis 101.
  • the transmission member 113a and the bobbin 112 can move relative to the head shell 111 as a whole.
  • the direction of movement of the spool 112 relative to the head shell 111 is consistent with the direction in which the lawn mower 100 cuts grass, that is, the direction of movement of the spool 112 relative to the head shell 111 is clockwise, that is, the spool 112 at this time Relative to the head shell 111 can produce relative movement, it can be considered that the linkage device 113 at this time is in the second equilibrium state, that is, the mowing head 11 is in the autonomous pay-off state.
  • a damping device 17 is also provided.
  • the damping device 17 has a damping spool 112 or head shell 111 to rotate and enables relative rotation between the spool 112 and the head shell 111.
  • the damping device 17 may be configured as a limit pin (not shown in the figure) for restricting the rotation of the head shell 111 or the spool 112, which can be inserted into a limit hole reserved on the head shell 111 or the spool 112, To limit the rotation of the head housing 111 or the spool 112.
  • the damping device 17 can also be configured as a friction member (not shown in the figure), which can contact the spool 112 or the head shell 111, so that the difference between the head shell 111 and the spool 112 is caused Relative movement.
  • the damping device 17 can also be configured to include a one-way bearing 171 and a rotating support 172; wherein, the one-way bearing 171 enables the two parts or parts connected to it to rotate in only one Rotate relative to one direction, but cannot rotate relative to another direction of rotation.
  • the function of the rotating support 172 is to rotatably connect a part of the mowing head 11 and form a support for its rotation.
  • the rotating support can be the first housing 121 of the mowing machine 100 containing the motor 122 or other
  • a housing 121 is a fixedly connected component, such as the shield 16.
  • a one-way bearing 171 is arranged between the rotation support 172 and the head shell 111 to form a one-way rotation connection, that is, when the rotation support 172 is used as a reference, the head shell 111 can rotate in one of the rotation directions It cannot rotate in another direction.
  • the motor shaft 122a is connected to the spool 112 in a non-rotational manner so that the spool 112 can rotate in both directions relative to the rotation support. When the rotation support 172 is used as a reference, the spool 112 can rotate forward and backward.
  • the motor shaft 122a drives the spool 112 to rotate forward.
  • the transmission member provided on the spool 112 engages with the first tooth 111f to achieve torque transmission, and at the same time, a one-way circumferential drive is set.
  • the head shell 111 can rotate relative to the supporting member 172 (that is, relative to the entire lawn mower 100) and can rotate forward.
  • the spool 112 and the head shell 111 rotate synchronously, and the lawn mower 100 can execute the cutting mode.
  • the motor shaft 122a drives the spool 112 to reverse, and the head housing 111 causes the spool 112 and the head housing 111 to move relative to each other because the one-way bearing 171 prevents it from reversing.
  • the drive on the transmission member The portion 113c is disengaged from the first tooth 111f due to the reverse rotation of the motor 122, so that the lawn mower 100 can perform the autonomous winding mode.
  • the tooth surface of the first tooth 111c obliquely intersects the first straight line 102 and forms a predetermined angle.
  • the first tooth 111c is inclined toward the first rotation direction.
  • the angle between the tooth surface of the first tooth 111c and the first straight line 102 is greater than 0° and less than or equal to 45°.
  • the trimming head 11 always keeps rotating at a constant speed.
  • an interaction force F exists between the driving portion 113c and the mating surface 111d.
  • the force F is distributed along a direction perpendicular to the mating surface 111d.
  • the mating surface 111d extends in the first plane 103, the first plane 103 is substantially parallel to the rotation axis 101, and there is a preset minimum distance L between the rotation axis 101 and the first plane 103. Set the distance L to be greater than zero. With this arrangement, the aforementioned interaction force F can be generated between the mating surface 111d and the driving portion 1113. When the lowermost distance between the rotation axis and the first plane 103 is greater than 0 and less than or equal to 20 mm, the above-mentioned interaction force F has a better effect.
  • the mating surface 111d is not limited to the smooth and continuous tooth surface formed on the first tooth 111f in this embodiment.
  • the mating surface 111d may exist in any form as long as it can provide a force acting on the driving portion 113c. OK.
  • the mating surface 111d includes an effective surface capable of providing a reaction force with the driving portion 113c, and the effective surface has a projection line in a plane perpendicular to the rotation axis.
  • the projection line includes a first limit position 111da and a second limit position 111db that can generate an interaction force with the driving portion 113c.
  • the effective action surface is located between the first limit position 111da and the second limit position 111db, and the part beyond the first limit position 111da and the second limit position 111db cannot produce a reaction force with the driving part 113c.
  • the section between the limit position 111db and the section where the reaction force can be generated between the driving part 113c is defined as the effective acting surface.
  • a central angle ⁇ is formed between the line connecting the first limit position 111da and the second limit position 111db with the axis of the rotation axis, and the center angle ⁇ is greater than 0° and less than or equal to 45°.
  • the central angle ⁇ is greater than or equal to 3° and less than or equal to 40°, the effect of the reaction force generated between the mating surface 111d and the driving portion 113c is better.
  • the torque output by the mowing head 11 also changes.
  • any point on the mating surface 111d can be used for force analysis.
  • the interaction force F between the first tooth 111f of the head shell 111 and the driving portion 113c of the transmission member 113a is distributed along a direction perpendicular to the mating surface 111d, which can be decomposed into a direction perpendicular to the line 102
  • the first force component and the second force component F1 along the direction of the straight line 102, wherein the second force component F1 is opposite to the centrifugal force F0.
  • friction is generated between the transmission member 113a and the spool 112 due to the centrifugal force F0.
  • the friction is actually generated when the transmission member 113a slides on the sliding rail formed by the stop portion 112b and the receiving groove 112c. Since the sliding rail is distributed symmetrically with respect to a plane passing through the straight line 102 and the rotation axis 101 at the same time, that is, in the straight line direction perpendicular to the rotation axis 101, the transmission member 113a and the limiting portion 112b include at least two contact surfaces, so the friction
  • the forces include F2 and F3, and F2 and F3 form a resultant force F4 distributed along the direction of the straight line 102.
  • the biasing force between the transmission member 113a and the biasing element 113b may be defined as F5.
  • F1, F4, and F5 are all distributed along the direction of the straight line 102 and deviate from the centrifugal force F0.
  • F0 is only related to the mass of the transmission member 113a, the angular velocity of the mowing head 11 and the radius of the spool 112, that is, when the aforementioned parameters are all fixed values, F0 is a constant.
  • F5 is the biasing force between the transmission member 113a and the biasing element 113b. When the elastic coefficient of the biasing element 113b is determined, F5 is also a constant.
  • the transmission member 113a cannot be separated from the first tooth 111f under the action of centrifugal force, and the entire mowing head 11 is in the first equilibrium state.
  • the torque of the mowing head 11 is small at this time, resulting in a small F1, so F0>F1+F4+F5, that is, the centrifugal force at this time is greater than that of F1, F4, and F5.
  • the transmission member 113a is separated from the first tooth 111f under the action of centrifugal force, and the entire mowing head 11 is in the second equilibrium state.
  • the spool 112 can rotate relative to the head shell 111, and the mowing head 11 starts to pay off. .
  • the angle between the mating surface 111d and the direction of the straight line 102 is 18°.
  • the torque at the output end of the motor is 0.505N ⁇ m.
  • T represents the torque at the output end of the motor
  • F represents the interaction force between the spool 112 and the transmission member 113a perpendicular to the mating surface 111d
  • R represents the force radius of an action point on the tooth surface.
  • the centrifugal force received by the transmission member 113a is less than the resultant force of the driving transmission member 113a toward the driving portion 113c meshing with the first tooth 111f on the head shell 111, and the transmission member 113a is maintained with the resultant force of all the forces received.
  • the head shell 111 is engaged.
  • the centrifugal force received by the transmission member 113a is greater than the resultant force of the driving portion 113c of the driving transmission member 113a and the first tooth 111f on the head shell 111, and then the transmission member 113a is under the action of the resultant force of all the forces received.
  • the transmission member 113a when the cutting head 11 is in the second equilibrium state, the transmission member 113a is not constrained by the first tooth 111f, and can continue to follow the straight line 102 toward the second tooth 111g under the action of centrifugal force movement.
  • the driving part 113c of the transmission member 113a moves to the second tooth 111g of the head housing 111, the driving part 113c starts to contact the reset surface 111e.
  • the reset surface 111e can push the transmission member 113a to move along the straight line 102 toward the first tooth 111f, and finally mesh with the first tooth 111f, thereby completing a wire setting and entering Until the next autonomous identification.
  • the second teeth 111g are not uniformly distributed in the circumferential direction around the rotation axis 101, and they include gradual arcs on the tooth surface facing the direction of the rotation axis 101, so as to continuously push the transmission member 113a to return to
  • the first tooth 111f is on and meshes with the first tooth 111f.
  • the central angle ⁇ formed by the line of the tooth surface of the second tooth 111g with the axis of rotation 101 is greater than or equal to 30° And less than or equal to 50°.
  • the tooth surface of the second tooth 111g close to the rotation axis 101 further includes a first section and a second section.
  • the driving part 113c of the transmission member 113a when the driving part 113c of the transmission member 113a is located in the range where the first section is located, the first section does not generate a driving force on the transmission member 113a.
  • the transmission member 113a is separated from the first tooth 111f, due to the head shell 111 is not driven at this time, it is in a stalled state, so that it rotates relative to the spool 112.
  • the driving portion 113c quickly moves to the second section and contacts the second section.
  • the mowing rope 15 is continuously released, and the reset surface 111e continuously pushes the driving part 113c to reset to the first tooth 111f.
  • the reset surface 111e in order to realize that the reset surface 111e can push the driving part 113c to reset to the first tooth, the reset surface 111e has a projection line in a plane perpendicular to the rotation axis 101, and the reset surface 111e is set within the range of the projection line It includes a first limit position 111ea and a second limit position 111eb that can push the transmission member 113a to be reset to the mating surface; also includes a first circle centered on the axis of the rotation axis 101 and passing through the first limit position 111ea to rotate The axis of the axis 101 is the center of the circle and passes through the second circle at the second limit position 111eb.
  • the angle ⁇ formed by the tangent of the first circle at the first limit position 111ea and the tangent of the second circle at the second limit position 111eb is greater than or equal to 15°.
  • the reset surface 111e When the driving part 113c is in contact with the reset surface 111e, the reset surface 111e has the first interaction force to push the driving part 113c to reset; as the relative rotation between the head housing 111 and the spool 112 continues, the driving part 113c and The return surface 111e is in direct contact more closely. At the same time, the relative speed between the head housing 111 and the spool 112 gradually increases, and the force between the return surface 111e and the drive portion 113c gradually increases until the drive portion 113c is in the second position. At the second limit position 111eb, the reset surface 111e pushes the transmission member 113a to completely reset.
  • the reset surface 111e has a second interaction force that pushes the driving part 113c to reset, wherein the first interaction force is smaller than the second interaction force.
  • the aforementioned included angle ⁇ is set to be greater than or equal to 15°, so that the reset surface has an effective length that can push the transmission member to the first position.
  • the included angle ⁇ is set to be greater than or equal to 20°, the return surface 111e can more reliably push the transmission member 113a to the first position, and the line-relaying effect of the mowing head 11 is better at this time.
  • the reset surface 111e pushes the transmission member 113a to the first position quickly, the mowing rope 15 may not be released in time and effectively.
  • the second section and the tooth surface of the first tooth 111f away from the rotation axis 101 form a guide channel 111h, which can guide the driving part 113c to return to the first position, that is, the driving part 113c and the first tooth 111f The position of engagement.
  • the driving portion 1113c will never be engaged with the second tooth 111g, thereby ensuring that the mowing rope 15 is released every release cycle
  • the length is limited to a small range, so as to avoid excessive release of the mowing rope 15 to increase the load of the motor 122, or the mowing rope 15 to damage the shield 16 due to the excessively long length of the mowing rope 15 being released.
  • the release of the mowing rope 15 has nothing to do with the speed change value. The mowing rope 15 is only released because the mowing rope 15 is shorter and the torque at the output end of the motor is small.

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Abstract

一种打草(100)机及其打草头(11),该打草机包括:打草头;驱动装置(12);操作装置(13);打草头包括:线轴(112);头壳(111),形成容纳空间(114);传动件(113a),设置在线轴上,并能沿一个垂直于转动轴线(101)方向的直线方向上在头壳和线轴之间自由运动;打草绳(15)具有一个自容纳空间延伸出来的有效长度,打草绳在有效长度范围内具有一个预设值;当打草绳的有效长度小于该预设值时,传动件自动释放头壳;当打草绳的有效长度大于该预设值时,传动件锁定头壳。

Description

打草机及其打草头
本申请要求申请日为2019年6月17日、申请号为201910520911.X的中国专利申请的优先权,该申请的全部内容通过引用结合在本申请中。
技术领域
本公开涉及一种花园工具,例如涉及一种打草机及其打草头。
背景技术
打草机作为一种花园类工具,可以适用于别墅草坪、花园草坪等地草的修剪。目前市面上的打草机主要采用敲击放线或通过开关控制打草头的线轴和头壳产生差速从而来进行放线的。对于用户来说,对于相关技术中的打草机而言,用户无法根据实际需求准确的放出打草绳的长度。事实上,相关技术中的打草头均无法实现真正意义上的自动放线。
一般而言,具备自动放线功能的打草头一般是通过使得头壳和线轴之间产生相对转动而使得打草绳被放出的。而使得头壳和线轴产生相对转动的方式多种多样。相关技术中,打草机的自动放线一般需要外界对打草头输入指示信号,且需要根据操作人员的人为判断控制打草机进行放线。即当操作人员观察到打草绳长短变化,打草效率降低时,人为控制打草机进行放线,这其中又包括通过放线开关控制打草机加速或减速等形式实现头壳和线轴之间速度差以实现放线,或者通过敲击打草头使得头壳和线轴之间产生速度差以实现放线。对于此类打草机而言,其在自动放线时,打草头在被驱动时均会产生较大的速度差,且一般会产生30%以上的速度差,从而实现头壳和线轴之间产生速度差。而对于相关技术中一些具备自动放线功能的打草机而言,其被设置为在打草机开、关机时,头壳和线轴之间也会产生速度差以实现放线,其无法根据实际需要进行有效且可靠的放线,在打草绳本身具备有效切割长度的前提下,这种放线需要用户将多余的打草绳剪断,其实际上在造成了一定程度的资源浪费,且对用户在实际操作过程中会造成一些不必要的困扰,严重影响了用户操作的便利性。
还有一些文献中披露了在打草头内部设置传感器,以感知打草绳的长短、并将该信号传输至控制部,以控制打草头加速或减速的实现方式,其也要求打草头具有较大的速度差,且速度差一般要求在30%以上,而通过传感器感知信号 并控制放线的打草头并未在相关技术中的产品中有所体现,且通过多方论证得出其在实际放线过程中一般会产生无法放线或放线过长的情况,其可靠性极差,无法适应打草机工作时较复杂的工况。
发明内容
本公开提供了一种放线可靠性高且操作便利性较高的打草机及其打草头。
一实施例提供一种打草机,包括:打草头;驱动装置,包括用于驱动打草头绕转动轴线转动的马达;打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;传动件,安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;其中,配合部形成有用于与驱动部接触以向驱动部施加反作用力的配合面,和用于与驱动部接触以向驱动部施加反作用力的复位面;当驱动部与配合面配合时,打草头处于工作状态;当驱动部与复位面配合时,打草头处于自主放线状态;在打草头处于自主放线状态且驱动部与复位面配合时,复位面在一个垂直于转动轴线的平面内具有一个投影线,投影线包括能推动传动件复位至与配合面配合的第一极限位置和第二极限位置;还包括以转动轴线的轴心为圆心且经过第一极限位置的第一圆周,以转动轴线的轴心为圆心且经过第二极限位置的第二圆周,第一圆周在第一极限位置处的切线与第二圆周在第二极限位置的切线形成的夹角小于等于45°;传动件相对线轴还具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;其中,在传动件处于第一位置时,打草头处于打草状态,马达具有第一转速;在传动件处于第二位置时,打草头处于自主放线状态,马达具有第二转速,第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0小于等于0.05,线轴和头壳之间产生相对转动以释放打草绳。
可选地,第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0小于等于0.1。
可选地,第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0小于等于0.15。
可选地,打草绳具有一个自容纳空间延伸出来的有效长度,打草绳在有效长度范围内具有一个预设值;当打草绳的有效长度大于该预设值时,传动件处于第一位置;当打草绳的有效长度小于该预设值时,传动件处于第二位置。
可选地,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布;在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且渐变的复位面。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过第一直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,打草头在被马达驱动绕转动轴线转动时,传动件相对线轴具有一个垂直于转动轴线的直线方向上的摩擦力,摩擦力与传动件产生的离心力方向相反。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草机,包括:打草头;驱动装置,包括用于驱动打草头绕转动轴线转动的马达;打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;联动装置,用于在线轴和头壳之间进行联动;其中,联动装置包括:传动件,相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;其中,在传动件处于第一位置时,打草头处于打草状态,马达具有第一转速;在传动件处于第二位置时,打草头处于自主放线状态,马达具有第二转速,第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0小于等于0.05,线轴和头壳之间产生相对转动以释放打草绳。
可选地,第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0小于等于0.1。
可选地,第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0小于等于0.15。
可选地,打草绳具有一个自容纳空间延伸出来的有效长度,打草绳在有效长度范围内具有一个预设值;当打草绳的有效长度大于该预设值时,传动件处于第一位置;当打草绳的有效长度小于该预设值时,传动件处于第二位置。
可选地,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布;在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且渐变的复位面。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过第一直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,打草头在被马达驱动绕转动轴线转动时,传动件相对线轴具有一个垂直于转动轴线的直线方向上的摩擦力,摩擦力与传动件产生的离心力方向相反。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草机,包括:打草头;驱动装置,包括用于驱动打草头绕旋转轴线转动的马达;打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;传动件,相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;其中,在传动件处于第一位置时,打草头处于工作状态,传动件随线轴同步的绕旋转轴线转动;在传动件处于第二位置时,打草头处于自主放线状态,线轴和头壳之间产生相对转动以释放打草绳;其中,传动件的质心偏离旋转轴线,在打草头被马达驱动转动时,传动件受到一个使得自身具有由第一位置朝向第二位置的运动趋势的离心力,头壳在绕旋转轴线转动时还向传动件施加抵抗离心力以阻止传动件由第一位置朝向第二位置的运动的阻力;在打草 头处于打草状态且打草绳伸出至头壳之外的有效部分的长度小于预设值时,头壳施加至传动件的阻力减小以使传动件在离心力作用下由第一位置朝向第二位置运动。
可选地,当打草绳的有效长度大于该预设值时,传动件处于第一位置;当打草绳的有效长度小于该预设值时,传动件处于第二位置。
可选地,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布。
可选地,在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且渐变的复位面。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,线轴上形成有限制传动件围绕旋转轴线转动的限位部,限位部关于一个经过第一直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于旋转轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,打草头在被马达驱动绕第一轴线转动时,传动件相对线轴具有一个垂直于第一轴线的直线方向上的摩擦力,摩擦力与传动件产生的离心力方向相反。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:线轴,用于缠绕打草绳;头壳,围绕形成有用于容纳至少部分线轴的容纳空间;传动件,相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;在传动件处于第一位置时,传动件随线轴同步的绕旋转轴线转动,打草头处于打草状态;在传动件处于第二位置时,线轴和头壳之间产生相对转动以释放打草绳;其中,传动件的重心偏离旋转轴线,在打草头转动时,传动件受到一个使得自身具有由第一位置朝向第二位置的运动趋势的离心力,头壳在绕旋转轴线转动时还向传动件施加抵抗离心力以阻止传动件由第一位置朝向第二位置的运动的阻力;在打草头处于打草状态且打草绳伸出至头壳之外的有效部分的长度小于预设值 时,头壳施加至传动件的阻力减小以使传动件在离心力作用下由第一位置朝向第二位置运动。
可选地,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布;在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且渐变的复位面。
一实施例提供一种打草机,包括:打草头,用于打草;驱动装置,包括用于驱动打草头绕转动轴线转动的马达;打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;联动装置,用于在线轴和头壳之间实现动力的传递,打草机具有打草状态,且在打草机处于工作状态时,联动装置驱动线轴或者头壳绕转动轴线且沿第一转动方向转动;其中,联动装置包括:传动件,具有阻止线轴相对头壳沿第一转动方向转动的第一位置和允许线轴相对头壳沿第一转动方向转动的第二位置;打草头还具有自动绕线状态和自主放线状态;在打草头处于自动绕线状态时,马达驱动线轴相对头壳沿第二转动方向转动以使打草绳缠绕至线轴;在打草头处于自主放线状态时,传动件移动至第二位置,线轴相对头壳沿第一转动方向转动以释放打草绳;其中,在打草头被马达驱动转动时,传动件受到一个使得自身具有由第一位置朝向第二位置的运动趋势的离心力,头壳在绕转动轴线转动时还向传动件施加抵抗离心力以阻止传动件由第一位置朝向第二位置的运动的阻力;在打草头处于工作状态且打草绳伸出至头壳之外的有效部分的长度小于预设值时,头壳施加至传动件的阻力减小以使传动件在离心力作用下由第一位置朝向第二位置运动。
可选地,还包括一个阻尼装置,用于阻尼线轴和头壳中的至少一个以使打草机处于自动绕线状态。
可选地,阻尼装置包括:阻尼件,用于阻止线轴向第一方向转动;在自动绕线状态下头壳向第一方向转动。
可选地,阻尼装置包括:阻尼件,用于阻止头壳向第二方向转动;在自动绕线状态下线轴向第二方向转动。
可选地,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;
可选地,配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供 传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布;
在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且具有渐变的复位面。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角α大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过第一直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;传动件,安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;其中,配合部形成有用于与驱动部接触以向驱动部施加反作用力的配合面,配合面在第一平面内延展,第一平面与转动轴线基本平行,且转动轴线与第一平面之间的距离大于0。
可选地,转动轴线与第一平面之间的距离大于0且小于等于20mm。
可选地,配合面包括能施加反作用力的有效作用面,有效作用面在一个垂直于转动轴线的平面内具有一个投影直线,投影直线包括第一极限位置和第二极限位置,第一极限位置与第二极限位置与转动轴线的轴心所夹的圆心角大于0°且小于等于45°。
可选地,第一极限位置与第二极限位置与转动轴线的轴心所夹的圆心角大于等于3°且小于等于40°。
可选地,传动件相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;打草绳具有一个自容纳空间延伸出来的有效长度,打草绳在有效长度范围内具有一个预设值;当打草绳的有效长度大于该预设值时,传动件处于第一位置;当打草绳的有效长度小于 该预设值时,传动件处于第二位置。
可选地,配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布。
可选地,在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且具有渐变的复位面。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线101的连线构成的圆心角α大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过第一直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
一实施例提供一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;传动件,安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;其中,配合部形成有用于与驱动部接触以向驱动部施加反作用力的配合面,配合面包括能施加反作用力的有效作用面,有效作用面在一个垂直于转动轴线的平面内具有一个投影直线,投影直线包括第一极限位置和第二极限位置,第一极限位置与第二极限位置与转动轴线的轴心所夹的圆心角大于0°且小于等于45°。
可选地,第一极限位置与第二极限位置与转动轴线的轴心所夹的圆心角大于等于3°且小于等于40°。
可选地,传动件相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;打草绳具有一个自容纳空间延伸出来的有效长度,打草绳在有效长度范围内具有一个预设值;当打草绳的有效长度大于该预设值时,传动件处于第一位置;当打草绳的有效长度小于该预设值时,传动件处于第二位置。
可选地,配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布。
可选地,在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分 布的齿面,齿面具有朝向转动轴线且具有渐变的复位面。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过第一直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;传动件,安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;其中,配合部形成有用于与驱动部接触以向驱动部施加反作用力的配合面,配合面在一个垂直于转动轴线的平面内具有一个投影直线,投影直线包括能向驱动部施加反作用力第一极限位置和第二极限位置,配合面包括能施加反作用力的有效作用面,有效作用面设置在第一极限位置与第二极限位置之间。
一实施例提供一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;传动件,安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;其中,配合部形成有用于与驱动部接触以向驱动部施加反作用力的配合面,和用于与驱动部接触以向驱动部施加反作用力的复位面;当驱动部与配合面配合时,打草头处于工作状态;当驱动部与复位面配合时,打草头处于自主放线状态;在打草头处于自主放线状态且驱动部与复位面配合时,复位面在一个垂直于转动轴线的平面内具有一个投影线,投影线包括能推动传动件复位至与配合面配合的第一极限位置和第二极限位置;还包括以转动轴线的轴心为圆心且经过第一极限位置的第一圆周,以转动轴线的轴心为圆心且经过第二极限位置的第二圆周,第一圆周在第一极限位置处的切线与第二圆周在第二极限位置的切线形成 的夹角小于等于45°。
可选地,第一圆周在第一极限位置处的切线与第二圆周在第二极限位置的切线形成的夹角小于等于30°。
可选地,传动件相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;
打草绳具有一个自容纳空间延伸出来的有效长度,打草绳在有效长度范围内具有一个预设值;当打草绳的有效长度大于该预设值时,传动件处于第一位置;当打草绳的有效长度小于该预设值时,传动件处于第二位置。
可选地,当驱动部运动至第一极限位置时和第二极限位置时,打草绳具有作用至头壳的反作用力,复位面具有推动传动件复位的第一分力和与打草绳作用至头壳上的反作用力相反的第二分力。
可选地,配合部包括围绕转动轴线分布的第一齿,第一齿形成或连接有配合面;头壳形成或连接有可供传动件复位的第二齿,第二齿形成或连接有复位面;第一齿和第二齿围绕转动轴线交错分布。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,打草头在被马达驱动绕转动轴线转动时,传动件相对线轴具有一个垂直于转动轴线的直线方向上的摩擦力,摩擦力与传动件产生的离心力方向相反。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;联动装置,用于在线轴和头壳之间实现动力的传递;其中,头壳形成有能供打草绳插入线轴内部的外穿线孔,线轴形成有能 供从外穿线孔插入头壳内部的打草绳结合至线轴的结合部;联动装置包括:传动件,安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;在打草头绕转动轴线转动时,且在传动件在随线轴绕转动轴线转动时,传动件产生一个沿直线方向的离心力,配合部与驱动部接触并向驱动部施加一个作用力,作用力分解为沿垂直于直线方向第一分力和沿直线方向且与离心力方向相反以阻止传动件沿直线方向移动的第二分力。
可选地,线轴形成有内穿线孔,当外穿线孔和内穿线孔位于同一径向时,打草绳能依次穿过外穿线孔和内穿线孔。
可选地,结合部为一个穿线通道,传动通道贯穿线轴并连接线轴上任意两个内穿线孔。
可选地,穿线通道沿曲线延伸。
可选地,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;
可选地,配合部包括围绕转动轴线分布的第一齿;头壳形成或连接有可供传动件复位的第二齿;第一齿和第二齿围绕转动轴线交错分布;在一个围绕转动轴线的圆周范围内,第二齿具有朝向转动轴线分布的齿面,齿面具有朝向转动轴线且具有渐变的凸起部。
可选地,齿面包括第一区段和第二区段,第一区段与第一齿远离转动轴线的齿面形成一个可供传动件沿一个垂直于转动轴线的径向活动的区段;第二区段与第一齿远离转动轴线的齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角α大于等于30°且小于等于50°。
可选地,线轴上形成有限制传动件围绕转动轴线转动的限位部,限位部关于一个经过直线的对称平面对称设置;限位部形成可供传动件滑动的滑轨,在一个垂直于转动轴线的直线方向上,限位件与限位部至少包括两个接触面。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
一实施例提供一种打草头,包括:线轴,用于缠绕打草绳;头壳,形成有容纳空间,线轴至少部分容纳在容纳空间内;联动装置,用于在线轴和头壳之 间实现动力的传递;头壳形成有能供打草绳插入线轴内部的外穿线孔,线轴形成有能供从外穿线孔插入头壳内部的打草绳结合至线轴的结合部;联动装置包括:传动件,相对线轴具有阻止线轴和头壳之间产生相对转动的第一位置和允许线轴和头壳之间产生相对转动的第二位置;在传动件处于第一位置时,打草头处于工作状态,传动件随线轴同步的绕旋转轴线转动;在传动件处于第二位置时,打草头处于自主放线状态,线轴和头壳之间产生相对转动以释放打草绳。
可选地,传动件安装至线轴,传动件包括用于驱动头壳随线轴同步转动的驱动部;头壳形成有用于与驱动部配合的配合部;在打草头绕转动轴线转动,且在传动件在随线轴绕转动轴线转动时,传动件产生一个沿直线方向的离心力,配合部与驱动部接触并向驱动部施加一个作用力,作用力分解为沿垂直于直线方向第一分力和沿直线方向且与离心力方向相反以阻止传动件沿直线方向移动的第二分力。
可选地,线轴形成有内穿线孔,当外穿线孔和内穿线孔位于同一径向时,打草绳能依次穿过外穿线孔和内穿线孔。
可选地,结合部为一个穿线通道,传动通道贯穿线轴并连接线轴上任意两个内穿线孔。
可选地,穿线通道沿曲线延伸。
可选地,打草头在被马达驱动绕转动轴线转动时,传动件相对线轴具有一个垂直于转动轴线的直线方向上的摩擦力,摩擦力与传动件产生的离心力方向相反。
可选地,配合部包括围绕转动轴线分布的第一齿,第一齿形成或连接有配合面;
头壳形成或连接有可供传动件复位的第二齿,第二齿形成或连接有复位面;第一齿和第二齿围绕转动轴线交错分布。
可选地,复位面包括第一区段和第二区段,第一区段与驱动部基本不产生相互作用力;第一齿包括有与配合面相交且远离转动轴线的齿面,第二区段与齿面形成一个可供传动件围绕转动轴线转动的引导通道。
可选地,第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
可选地,线轴还形成或连接有一个容纳槽,容纳槽内设置有一个偏压元件,偏压元件一端抵持容纳槽的槽底,另一端抵持传动件。
通过设置与驱动部配合的传动件,通过纯粹的机械配合,实现打草头本身会在打草绳缩短到预设长度时自动放线以满足打草时对打草绳的长度需求,无需人为判断放线条件,提升了打草机放线的可靠性和使用的便利性。
附图说明
图1是打草机的立体图;
图2是图1中的打草机的打草头的剖视图;
图3是图1中的打草机的打草头的爆炸图;
图4是图3中的打草机的打草头的另一视角的爆炸图;
图5是图3中的打草机的线轴的剖面图;
图6是图3中的打草机的线轴和传动件的立体图;
图7是图3中的打草机的头壳、线轴和传动件的俯视图;
图8是图3中的打草机的头壳、线轴和传动件的剖视图;
图9是图3中的打草机的头壳的俯视图;
图10是图9中的打草机的头壳的第一齿上任意一点处的受力分析图;
图11是图3中的打草机的头壳、线轴和传动件且传动件位于第一齿和第二齿之间时的剖视图;
图12是图3中的打草机的头壳、线轴和传动件且传动件在被第二齿推动复位时的剖视图;
图13是图12中的打草机的头壳、线轴和传动件且传动件在被第二齿推动复位时且删去部分第一齿和第二齿的剖视图。
具体实施方式
图1示出的打草机100包括:打草头11、驱动装置12、操作装置13和连接装置14。
如图1至图2所示,打草头11用于安装打草绳15以实现打草功能。驱动装置12用于给打草头11提供旋转的动力,驱动装置12包括马达122和第一壳体121,马达122设置在第一壳体121内,马达122驱动打草头11以转动轴线101为轴转动。操作装置13包括:把手131、辅助把手132、主开关133和第二壳体134。把手131和辅助把手132用于供用户的双手分别握持,从而能够更稳定的操作该打草机100。主开关133可以设置在把手131上,用户在握持把手131时能够直接操作主 开关133以控制打草机100进行打草。第二壳体134用于形成结合电源装置的结合部,例如,结合部能结合一个电池包给打草机100供电。在本实施方式中,把手131和第二壳体134分开形成。在一些其它实施方式中,把手也可以与第二壳体一体成型。连接装置14包括用于连接第一壳体121和第二壳体134的连接杆。辅助把手132也安装至连接杆,辅助把手132还位于第一壳体121和第二壳体134之间。打草机100还包括护罩16,护罩16至少部分围绕打草头11分布,其能防止打草头11打草时,草屑飞入至用户操作者站立方向。
为了方便说明本公开的技术方案,还定义了如图1所述的上侧和下侧,其中,驱动装置12设置在打草头11的上侧,打草头11设置在驱动装置12的下侧。
打草头11还包括:头壳111、线轴112和联动装置113。头壳111围绕转动轴线101形成有一个能至少容纳部分线轴112的容纳空间114,头壳111形成容纳空间114的一侧为头壳111的内侧,头壳111的与内侧相对的另一侧为外侧。
如图1至图4所示,线轴112设置在容纳空间114内,也即是说线轴112设置在头壳111的内侧。线轴112用于缠绕打草绳15,打草绳15用于打草。头壳111还形成有供打草绳15伸出至头壳111外侧的外穿线孔111a,外穿线孔111a的数目为2。线轴112还形成有内穿线孔112a,当内穿线孔112a和外穿线孔111a位于同一径向上时,打草绳15能够依次穿过外穿线孔111a和内穿线孔112a。示例性的,线轴112还形成有连接两个内穿线孔112a并可供打草绳15穿过的穿线通道112d。事实上,穿线通道112d连接线轴上的任意两个内穿线孔,且穿线通道被设置为沿曲线延伸。在用户需要补充打草绳15时,用户可以将打草绳15的穿过外穿线孔111a进入容纳空间114内,然后穿过内穿线孔112a贯穿穿线通道112d从相对一侧的外穿线孔111a穿出至头壳111外部。当需要向线轴112上缠绕打草绳15时,用户不需要打开头壳111。可以直接将打草绳15伸入至头壳111内部然后通过线轴112和头壳111的相对转动向线轴112上缠绕打草绳15,这样的打草头11通常称之为外插式绕线打草头。
打草绳15穿过外穿线孔111a伸出至头壳111之外的部分定义为打草绳15的有效部分,打草绳15的有效部分通过高速旋转切断杂草。为了实现对预设范围内的杂草进行打草,打草绳15的有效部分的长度能够达到一个预设值,也即是说,打草绳15的有效部分的长度有必要大于等于该预设值。当打草绳15的有效部分的长度小于该预设值时,由于打草绳15的有效部分较短,打草绳15的打草效率可能降低。为了实现打草绳15的有效部分的长度始终维持大于等于该预设 值的长度区间上,本实施方式中的打草机100可以实现当打草绳15的有效部分的长度低于预设值时,联动装置113控制打草绳15自动放线至大于等于该预设值的长度区间。为了避免打草绳15的伸出长度过长,并与护罩16产生干扰,打草绳15的有效部分实际上还小于等于一个极限值。打草绳15在该极限范围内,一方面能够有效打草并能维持较高的打草效率;另一方面,打草绳15还不至于与护罩16干扰,从而能够持续打草。
联动装置113用于控制打草头11是否放线,联动装置113具有使得打草头11不能进行放线的第一平衡状态,这时打草头11处于工作状态;联动装置113还具有使得打草头11能够放线的第二平衡状态,这时打草头11处于自主放线状态。在本实施方式中,联动装置113能够自主识别打草绳15的有效长度,并能根据打草绳15的有效部分的长度自动调整打草头11进入第一平衡状态或第二平衡状态,即调节打草头11自主进入工作状态或自主放线状态。这里需要强调的是,联动装置113自主识别并调整打草头11的工作状态是基于联动装置113自身而言的,其不需要接受外界输入的放线或打草的指示信号。这里所述的指示信号包括外界对打草头11产生的外力、电信号、磁力或其他作用力而使得联动装置113进行模式切换的信号。在一些常有的指示信号中,其一般包括:敲击打草头11的外壳使得线轴112与头壳111产生速度差从而放线;通过开关调速使得线轴112与头壳111产生速度差从而放线;通过传感器感应电机中的电流变化从而使得线轴112与头壳111产生速度差从而放线。此外,本实施方式中的打草头11转速恒定,其不需要通过调节马达122的转速以使得线轴112产生转速变化来获得头壳111与线轴112之间的速度差从而进行放线。
示例性的,当联动装置113处于第一平衡状态时,线轴112和头壳111之间相对静止,这样,线轴112和头壳111将会受到马达轴122a的驱动而同步转动,从而使得这时缠绕在线轴112上的打草绳15伸出头壳111的有效部分的长度不会发生变化,也即是说,打草绳15不能被释放,这时打草头11处于正常工作的状态。当联动装置113处于第二平衡状态时,线轴112与头壳111之间产生相对运动,这样,打草绳15在自身离心力的作用下相对线轴112被甩出,从而使得打草绳15被释放,进而打草绳15的有效部分的长度将会增大。
如图3至图4所示,在一些实施方式中,联动装置113包括一个传动件113a,其能在线轴112和头壳111之间自由运动。当联动装置113处于第一平衡状态时,传动件113a随线轴112同步转动,此时传动件113a处于第一位置,同时传动件 113a还与头壳111配合以驱动头壳111随线轴112同步转动,且此时马达具有第一转速;而当联动装置113处于第二平衡状态时,传动件113a随线轴112转动,同时传动件113a脱离与头壳111的配合,此时传动件113a处于第二位置,这时线轴112与头壳111之间能产生相对运动,且此时马达122具有第一转速。作为一种实现方式,当传动件113a处于第一位置或第二位置时,马达122的第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0且小于等于0.15。作为一种实施方式,当传动件113a处于第一位置或第二位置时,马达122的第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0且小于等于0.1。事实上,在较好的状态下,当传动件113a处于第一位置或第二位置时,马达122的第一转速和第二转速的差值的绝对值与第一转速的比值大于等于0且小于等于0.05,且马达122的第一转速和第二转速的差值的绝对值与第一转速的比值无限趋近于0。通过这样的设置,实现了打草头11无差速变化即可实现自主放线,即真正意义上的自动放线。当打草头11的传动件113a出现位移、或打草绳15因磨损或在自主放线过程中释放至预设长度,其均产生了预设的作用力,从而使得打草头11在打草绳15的荷载作用下、打草头11内部零件的相对运动等因素的影响下,打草头11本身的转速产生了预设的变化,从而使得打草头11无法始终保持理论上的绝对匀速转动,从而产生了与第一速度相异的第二速度。这里,在上述误差允许的范围内,认定打草头11由第一速度变化至第二速度仍处于前述的匀速转动的范畴内,且打草头11在自主放线状态和工作状态之间切换并不依赖于上述速度的变化。
可选的,在一个基本垂直于转动轴线101方向或与转动轴线101倾斜相交的直线102方向上,传动件113a沿直线102方向设置在线轴112和头壳111之间。马达轴122a与线轴112构成同步转动。传动件113a设置有一个传动孔,通过该传动孔套设在线轴112上,并能随线轴112同步转动。这样,当马达轴122a驱动线轴112转动时,传动件113a能随线轴112同步转动。事实上,线轴112上还形成或连接有限位部112b,限位部112b能限制传动件113a围绕转动轴线101方向的周向上产生位移。示例性的,限位部112b为一对关于经过直线102的对称平面对称设置的凸起,传动件113a沿转动轴线101方向套设至线轴112时能被限定在限位部112b的范围内,且仅能沿与转动轴线101垂直的直线方向上产生径向的位移。传动件113a在质量分布上相对经过转动轴线101的对称平面是不对称的,可选的,传动件113a的质心G偏离转动轴线101,从而在打草头11被马达122驱动转动时, 传动件113a受到一个使得自身具有由第一位置朝向第二位置的运动趋势的离心力,头壳111在绕旋转轴线101转动时还向传动件113a施加抵抗离心力以阻止传动件由第一位置朝向第二位置的运动的阻力。传动件113a与线轴112之间还设置有一个偏压元件113b,该偏压元件113b可以为一个螺旋弹簧。
可选的,线轴112上延伸形成有容纳槽112c,螺旋弹簧至少部分设置在容纳槽112c内,螺旋弹簧的一端抵持容纳槽112c的槽底、另一端抵持传动件113a。传动件113a的重心和螺旋弹簧设置在转动轴线101的两侧。此外,限位部112b与容纳槽112c配合还形成了一个可供传动件113a滑动的滑轨,即传动件113a还与线轴112构成滑动连接,当传动件113a随线轴112转动时,传动件113a将会产生离心力,同时传动件113a还受到偏压元件113b的偏压力,偏压力和离心力的方向相反,离心力和偏压力的方向可选的可以均在直线102方向上,传动件113a与线轴112构成滑动的方向也可以沿着直线102方向。传动件113a的重心和偏压元件113b分别设置在一个经过转动轴线101且垂直于直线102的平面的两侧。在一实施例中,传动件113a相对线轴112沿直线102方向运动过程中,还受到传动件113a与线轴112之间的摩擦力的作用,摩擦力可以有效的防止偏压元件113b克服离心力的作用,避免联动装置113过分灵活导致误放线。
如图3至图7所示,在本实施例中,头壳111围绕转动轴线101形成上述容纳空间114,线轴112至少部分设置在头壳111形成的容纳空间114内,传动件113a至少部分位于该容纳空间114内。示例性的,头壳111沿转动轴线101方向的靠近马达122的一端形成有上底111b,上底111b并没有封闭容纳空间114,容纳空间114向上部分敞开,从而马达轴122a穿过上底111b伸入至容纳空间114内,传动件113a部分伸出至头壳111之外。头壳111还形成有可被传动件1113a驱动的配合部111c,传动件113a形成有与配合部111c配合的驱动部113c。当驱动部113c与配合部111c配合时,传动件113a与头壳之间能传递作用力。可选的,配合部111c包括配合面111d和复位面111e,其中,配合面111d用于与驱动部113c接触以向驱动部113c施加反作用力;复位面111e用于与驱动部113c接触以向驱动部113c施加作用力;当驱动部113c与配合面111d配合时,打草头11处于工作状态;当驱动部113c与复位面111e配合时,打草头11处于自主放线状态。
如图8至图10所示上底111b朝向马达122的方向延伸形成有内圈和外圈,内圈和外圈均围绕转动轴线101形成,内圈形成有第一齿111f,第一齿111f为内圈上形成的朝向外圈突出形成的外齿,外圈形成有第二齿111g,第二齿111g为外 圈上形成的朝向内圈突出形成的内齿。其中,第一齿111f构成或形成有上述配合面111d,第二齿111g构成或形成有上述复位面111e。配合部111c其中,第一齿111f的数目为多个,第二齿111g的数目也为多个,在围绕转动轴线101的圆周方向上,第一齿111f和第二齿111g相互错开,也即是说,第一齿111f和第二齿111g并非同时设置在一个垂直于转动轴线101的直径方向上。传动件113a上的驱动部113c可以设置为与第一齿111f和第二齿111g配合的咬合齿。在本实施例中,驱动部113c和偏压元件113b分别设置在传动件113a的两侧,也即是说,驱动部113c和传动件113a的质心设置在转动轴线101的同侧。
如图12所示,当传动件113a的驱动部113c与第一齿111f或者第二齿111g啮合且马达轴122a沿第一转动方向转动,即马达轴122a顺时针转动时,传动件113a使得头壳111相对线轴112静止,也即是说,此时的线轴112与头壳111之间没有产生相对运动,可以认为这时的联动装置113处于第一平衡状态,打草机100处于正常打草的工作状态。而如图12所示,当传动件113a的驱动部113c与第一齿111f以及第二齿111g均脱离时,传动件113a和线轴112构成的整体能够相对头壳111运动。在本实施例中,线轴112相对头壳111运动的方向与打草机100打草的方向一致,即线轴112相对头壳111的运动方向为顺时针方向,也即是说,这时线轴112相对头壳111能够产生相对运动,可以认为此时的联动装置113处于第二平衡状态,也即是打草头11处于自主放线状态。
在该实施例中还设有阻尼装置17,阻尼装置17具有阻尼线轴112或头壳111转动并使得线轴112和头壳111之间能产生相对转动。示例性的,阻尼装置17可以设置为用于限制头壳111或线轴112转动的限位销(图未示出),其能插入至头壳111或线轴112上预留的限位孔中,以限制头壳111或线轴112转动。作为另一种实现方式,阻尼装置17还可以被设置为摩擦件(图未示出),其能与线轴112或头壳111接触,从而使得头壳111和线轴112之间因为差速而产生相对运动。作为另一种实现方式,阻尼装置17还可以被设置为包括一个单向轴承171和一个转动支承件172;其中,单向轴承171能使它所连接的两个零件或部分仅能在一个旋转方向上相对转动,而在另一个旋转方向上是无法相对转动的。转动支承件172的作用在于可转动地连接打草头11中的一部分并对其转动构成支承,转动支撑件可以是打草机100中容纳马达122的第一壳体121也可以是其他与第一壳体121固定连接的部件,比如护罩16。可选的,单向轴承171设置在转动支承件172和头壳111之间使它们构成单向的转动连接,即以转动支承件172作为参照物时, 头壳111能向其中一个旋向转动而不能向另一个旋向转动。马达轴122a止转地连接至线轴112以使线轴112能相对转动支撑件双向转动,既以转动支承件172作为参照物时,线轴112既能正转也能反转。
基于以上的硬件,可使马达122正转时,马达轴122a带动线轴112正转,此时设置在线轴112上的传动件通过与第一齿111f啮合实现扭矩传动,同时设置单向周向使头壳111能相对转动支承件172(即相对打草机100整体)是可以正转的。那么此时,线轴112和头壳111同步转动,打草机100可以执行切割模式。当在马达122反转时,马达轴122a带动线轴112反转,而头壳111因为单向轴承171阻止其反转而使线轴112和头壳111产生相对运动,且此时传动件上的驱动部113c由于马达122反转而与第一齿111f脱离,从而使打草机100可以执行自主绕线模式。
示例性的,如图8至图9所示,第一齿111c的齿面与第一直线102倾斜相交,并形成一个预设角度。第一齿111c朝向第一转动方向倾斜。在一些实施方式中,第一齿111c的齿面与第一直线102之间的夹角大于0°小于等于45°。在打草机100打草过程中,打草头11始终保持匀速转动,传动件113a在随线轴112匀速转动的过程中,驱动部113c与配合面111d之间会存在相互作用力F。示例性的,该作用力F沿一个垂直于配合面111d的方向分布。在本实施方式中,配合面111d在第一平面103内延伸,第一平面103与转动轴线101基本平行,且转动轴线101与第一平面之间103具有一个预设的最小距离L,该预设距离L大于0。通过这样的设置,配合面111d能与驱动部1113之间产生上述相互作用力F。当转动轴线与第一平面103之间的最下距离大于0且小于等于20mm时,上述相互作用力F的作用效果更佳。
此外,配合面111d并不限于本实施方式中的第一齿111f上形成的光滑且连续的齿面,配合面111d可以以任意的形式存在,只要其能提供一个作用于驱动部113c的作用力即可。事实上,配合面111d包括能与驱动部113c之间提供反作用力的有效作用面,该有效作用面在一个垂直于转动轴线的平面内具有一个投影直线。该投影直线包括能与驱动部113c之间产生相互作用力的第一极限位置111da和第二极限位置111db。这里定义有效作用面位于第一极限位置111da和第二极限位置111db之间,超出第一极限位置111da和第二极限位置111db以外的部分则无法与驱动部113c产生反作用力。事实上,第一极限位置111da和第二极限位置111db之间也可以存在有无法与驱动部113c之间产生反作用力的区段,这里我们不作限制,只要能在第一极限位置111da和第二极限位置111db之间的区段 能够与驱动部113c之间产生反作用力的区段,我们均定义为有效作用面。在本实施方式中,第一极限位置111da与第二极限位置111db与转动轴线的轴心的连线之间形成一个圆心角α,该圆心角α大于0°且小于等于45°。在该圆心角α的范围内,配合面111d与驱动部113c之间能有效产生的反作用力。当上述圆心角α大于等于3°且小于等于40°时,配合面111d与驱动部113c之间产生的反作用力的作用力效果更佳。
然而,打草头11在转动过程中,由于打草绳15长短的变化,打草头11输出的扭矩也随之发生变化。示例性的,打草绳15越长,打草头11输出的扭矩越大,传动件113a与头壳111之间的相互作用力也会越大;相反的,打草绳15越短,打草头11输出的扭矩越小,传动件113a与头壳111之间的相互作用力也会越小。
这里,可以取配合面111d上的任一点做受力分析。如图11所示,头壳111的第一齿111f与传动件113a的驱动部113c之间的相互作用力F沿一个垂直于配合面111d方向分布,其可被分解为垂直于直线102方向的第一分力和沿直线102方向的第二分力F1,其中第二分力F1与离心力F0方向相反。此外,传动件113a与线轴112之间还因为离心力F0的作用而产生摩擦,该摩擦实际上是传动件113a在限位部112b与容纳槽112c配合形成的滑轨中滑动时产生的。由于该滑轨关于一个同时经过直线102和转动轴线101的平面对称的分布,即在垂直于转动轴线101的直线方向上,传动件113a与限位部112b包括至少两个接触面,故该摩擦力包括F2和F3,而F2和F3形成沿直线102方向分布的合力F4。此外,上述传动件113a与偏压元件113b之间的偏压力可以定义为F5,示例性的,F1、F4、F5均沿直线102方向分布且背离离心力F0。在本实施方式中,F0仅与传动件113a的质量和打草头11的角速度及线轴112的半径有关,即在前述参数均为定值时,F0为一个常量。F5为传动件113a与偏压元件113b之间的偏压力,在偏压元件113b的弹性系数确定的情况下,F5也为常量。故而,在打草头11转动过程中,当因打草绳15的长度变化而导致打草头11负载变化过程中,仅F发生变化,即F1发生了变化;而F4为传动件113a与线轴112之间的滑动摩擦力,在传动件113a与线轴112的材质和接触面积确定的情况下,F4随F1同步变化。所以,当打草绳15大于一个预设长度时,此时打草头11的扭矩较大,导致F1也较大,从而F0<F1+F4+F5,即此时的离心力小于F1、F4和F5的作用力之和,传动件113a无法在离心力的作用下脱离第一齿111f,整个打草头11处于第一平衡状态。当打草绳15小于一个预设长度时,此时打草头11的扭矩较小,导致F1也较小,从而F0>F1+F4+F5,即此时 的离心力大于F1、F4和F5的作用力之和,传动件113a在离心力的作用下脱离第一齿111f,整个打草头11处于第二平衡状态,此时线轴112能与头壳111发生相对转动,打草头11开始放线。
在一个实施方式中,配合面111d与直线102方向之间的夹角为18°。当打草绳15有效部分的长度在大于预设值时,电机输出端的扭矩为0.505N·m。此时按照作用力反作用力原则进行力学计算:
T=F*R;
其中,这里T代表电机输出端的扭矩,F代表在一个垂直于配合面111d上线轴112和传动件113a之间的相互作用力,R代表齿面上的一个作用点的受力半径。
推导出在打草绳15的有效部分的长度在大于预设值时,传动件113a的受力如下:
F=T/R=0.505/37.5*1000=13.47N;
F1=F*sin18=13.47*sin18=4.16N;
F4=F*k=13.47*0.25=3.37N;
F5=3N;
F0=mw^2*r=0.0167*607.37*607.37*0.0014=8.62N。
由此可以得出,当打草绳15的有效部分的长度大于预设值时,传动件113a的所受到的离心力和其它合力的关系为:
8.62<4.16+3.37+3=10.53;
也即是:
F0<F1+F4+F5。
从而这时,传动件113a所受到的离心力小于驱动传动件113a朝向驱动部113c与头壳111上的第一齿111f啮合的合力,进而传动件113a在所受到的所有力的合力作用下保持与头壳111啮合。
而当打草绳15有效部分被磨短了40mm之后,电机输出端的扭矩0.265N·m。此时推导出在打草绳15的有效部分的长度被磨损的小于预设值时,传动件的受力如下:
F=T/R=0.24/37.5*1000=7.07N;
F1=F*sin18=7.07*sin18=2.18N;
F4=F*k=7.07*0.25=1.77N;
F5=3N
F0=mw^2*r=0.0167*607.37*607.37*0.0014=8.62N。
由此可以得出,当打草绳15的有效部分的长度小于预设值时,传动件113a的所受到的离心力和其它合力的关系为:
8.62>2.18+1.77+3=6.95;
也即是:
F0>F1+F4+F5。
从而此时,传动件113a所受到的离心力大于驱动传动件113a的驱动部113c与头壳111上的第一齿111f啮合的合力,进而传动件113a在所受到的所有力的合力的作用下沿直线方向运动以脱离头壳111,从而这时传动件113a允许头壳111和线轴112产生相对转动,进而这时打草绳15可以被释放。
上述展示出的一个力学计算过程仅为了便于理解打草头11在第一平衡状态下,打草头11匀速转动时,线轴112、头壳111和传动件113a之间的受力关系,在实际使用过程中,以上数据会存在预设的偏差,其并未限定本公开在其他实施方式的保护范围。
如图12至图13所示,当打草头11处于第二平衡状态时,传动件113a不受到第一齿111f的约束,并能在离心力的作用下继续沿直线102方向朝向第二齿111g运动。当传动件113a的驱动部113c运动至头壳111的第二齿111g时,驱动部113c开始与复位面111e接触。复位面111e在头壳111和线轴112之间相对转动过程中,能推动传动件113a沿直线102方向朝向第一齿111f运动,并最终与第一齿111f啮合,从而完成一次放线,并进入至下一次自主识别。在本实施方式中,第二齿111g在围绕转动轴线101的圆周方向并不均匀分布,其在朝向转动轴线101方向的齿面上包括有渐变的圆弧,从而能持续推动传动件113a复位至第一齿111f上,并与第一齿111f啮合。事实上,作为一种实现方式,在一个垂直于转动轴线101的平面内,第二齿111g的齿面的齿尖与齿底分别与转动轴线101的连线构成的圆心角β大于等于30°且小于等于50°。第二齿111g靠近转动轴线101的齿面还包括第一区段和第二区段。其中,当传动件113a的驱动部113c位于第一区段所在的范围内时,第一区段并未对传动件113a产生推动力,传动件113a在与第一齿111f脱离后,由于头壳111此时未被驱动,其处于失速状态,从而与线轴112产生相对转动。此时,驱动部113c迅速运动至第二区段,并与第二区段接触。在此过程中,打草绳15持续放出,且复位面111e持续推动驱动部113c复位至第一齿111f。示例性的,为了实现复位面111e能推动驱动部113c复位至第一齿,复 位面111e在一个垂直于转动轴线101的平面内具有一个投影线,复位面111e被设置为在该投影线范围内包括能推动传动件113a复位至与配合面配合的第一极限位置111ea和第二极限位置111eb;还包括以转动轴线101的轴心为圆心且经过第一极限位置111ea的第一圆周,以转动轴线101的轴心为圆心且经过第二极限位置111eb的第二圆周,第一圆周在第一极限位置111ea处的切线与第二圆周在第二极限位置111eb的切线形成的夹角γ大于等于15°。事实上,当驱动部113c在于复位面111e的接触过程中,当驱动部113c处于第一极限位置111ea时,此时,头壳111刚刚进入失速状态,其与线轴112之间还存在有较小的速度差,当驱动部113c与复位面111e接触时,复位面111e具备推动驱动部113c复位的第一相互作用力;随着头壳111与线轴112之间持续产生相对转动,驱动部113c与复位面111e直接的接触更加紧密,与此同时,头壳111与线轴112之间的相对速度逐渐增大,复位面111e与驱动部113c之间的作用力逐渐增大,直至驱动部113c处于第二极限位置111eb时,复位面111e推动传动件113a完全复位,此时复位面111e具备推动驱动部113c复位的第二相互作用力,其中第一相互作用力小于第二相互作用力。这里,为了使得传动件被推动并复位至第一齿,上述夹角γ被设置为大于等于15°,从而使得复位面具备能将传动件推动至第一位置的有效长度。示例性的,当夹角γ被设置为大于等于20°时,复位面111e能更可靠的将传动件113a推动至第一位置,且此时打草头11的放线效果更佳。在一实施例中,如果复位面111e较快的将传动件113a推动至第一位置,则打草绳15可能无法被及时且有效的放出。
事实上,第二区段与第一齿111f远离转动轴线101的齿面形成了一个引导通道111h,该引导通道111h能引导驱动部113c复位至第一位置,即驱动部113c与第一齿111f啮合的位置。示例性的,由于复位面111e的存在,且复位面111e连续延伸,,使得驱动部1113c始终不会与第二齿111g存在啮合的状态,从而保证了打草绳15的每个释放周期所释放的长度被限制在一个较小的范围内,从而避免打草绳15释放过量而增加了马达122的荷载或者由于打草绳15释放的长度过长使得打草绳15打坏护罩16。
事实上,在开机时,打草头11在从静止状态下加速到匀速状态时,如果打草绳15大于一个预设长度,打草绳15不会因为速度变化而放出;如果打草绳15小于一个预设长度时,打草绳15虽然会随速度变化而放出至一个大于预设长度的长度区间。在一实施例中,打草绳15的放出与速度变化值无关,仅因为打草 绳15较短,电机输出端的扭矩较小而使得打草绳15放出的。

Claims (90)

  1. 一种打草机,包括:
    打草头;
    驱动装置,包括用于驱动所述打草头绕转动轴线转动的马达;
    所述打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    传动件,安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;
    其中,所述配合部形成有用于与所述驱动部接触以向所述驱动部施加反作用力的配合面,和用于与所述驱动部接触以向所述驱动部施加反作用力的复位面;当所述驱动部与所述配合面配合时,所述打草头处于工作状态;当所述驱动部与所述复位面配合时,所述打草头处于自主放线状态;
    在所述打草头处于所述自主放线状态且所述驱动部与所述复位面配合时,所述复位面在一个垂直于所述转动轴线的平面内具有一个投影线,所述投影线包括能推动所述传动件复位至与所述配合面配合的第一极限位置和第二极限位置;
    还包括以所述转动轴线的轴心为圆心且经过所述第一极限位置的第一圆周,以所述转动轴线的轴心为圆心且经过所述第二极限位置的第二圆周,所述第一圆周在所述第一极限位置处的切线与所述第二圆周在所述第二极限位置的切线形成的夹角小于等于45°;
    所述传动件相对所述线轴还具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    其中,在所述传动件处于所述第一位置时,所述打草头处于打草状态,所述马达具有第一转速;
    在所述传动件处于所述第二位置时,所述打草头处于自主放线状态,所述马达具有第二转速,所述第一转速和所述第二转速的差值的绝对值与所述第一转速的比值大于等于0小于等于0.05,所述线轴和所述头壳之间产生相对转动以释放所述打草绳。
  2. 根据权利要求1所述的打草机,其中,
    所述第一转速和所述第二转速的差值的绝对值与所述第一转速的比值大于 等于0小于等于0.1。
  3. 根据权利要求1所述的打草机,其中,
    所述第一转速和所述第二转速的差值的绝对值与所述第一转速的比值大于等于0小于等于0.15。
  4. 根据权利要求1所述的打草机,其中,
    所述打草绳具有一个自所述容纳空间延伸出来的有效长度,所述打草绳在有效长度范围内具有一个预设值;当所述打草绳的有效长度大于该预设值时,所述传动件处于第一位置;当所述打草绳的有效长度小于该预设值时,所述传动件处于第二位置。
  5. 根据权利要求1所述的打草机,其中,
    所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;所述头壳形成有用于与所述驱动部配合的配合部;
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布;
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且渐变的复位面。
  6. 根据权利要求5所述的打草机,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  7. 根据权利要求6所述的打草机,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
  8. 根据权利要求1所述的打草机,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述第一直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  9. 根据权利要求1所述的打草机,其中,
    所述打草头在被所述马达驱动绕所述转动轴线转动时,所述传动件相对所述线轴具有一个垂直于所述转动轴线的直线方向上的摩擦力,所述摩擦力与所述传动件产生的离心力方向相反。
  10. 根据权利要求1所述的打草机,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  11. 一种打草机,包括:
    打草头;
    驱动装置,包括用于驱动所述打草头绕转动轴线转动的马达;
    所述打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    联动装置,用于在所述线轴和头壳之间进行联动;
    其中,所述联动装置包括:
    传动件,相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    其中,在所述传动件处于所述第一位置时,所述打草头处于打草状态,所述马达具有第一转速;
    在所述传动件处于所述第二位置时,所述打草头处于自主放线状态,所述马达具有第二转速,所述第一转速和所述第二转速的差值的绝对值与所述第一转速的比值大于等于0小于等于0.05,所述线轴和所述头壳之间产生相对转动以释放所述打草绳。
  12. 根据权利要求11所述的打草机,其中,
    所述第一转速和所述第二转速的差值的绝对值与所述第一转速的比值大于等于0小于等于0.1。
  13. 根据权利要求11所述的打草机,其中,
    所述第一转速和所述第二转速的差值的绝对值与所述第一转速的比值大于等于0小于等于0.15。
  14. 根据权利要求11所述的打草机,其中,
    所述打草绳具有一个自所述容纳空间延伸出来的有效长度,所述打草绳在有效长度范围内具有一个预设值;当所述打草绳的有效长度大于该预设值时, 所述传动件处于第一位置;当所述打草绳的有效长度小于该预设值时,所述传动件处于第二位置。
  15. 根据权利要求11所述的打草机,其中,
    所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;所述头壳形成有用于与所述驱动部配合的配合部;
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布;
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且渐变的复位面。
  16. 根据权利要求15所述的打草机,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  17. 根据权利要求16所述的打草机,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
  18. 根据权利要求11所述的打草机,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述第一直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  19. 根据权利要求11所述的打草机,其中,
    所述打草头在被所述马达驱动绕所述转动轴线转动时,所述传动件相对所述线轴具有一个垂直于所述转动轴线的直线方向上的摩擦力,所述摩擦力与所述传动件产生的离心力方向相反。
  20. 根据权利要求11所述的打草机,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  21. 一种打草机,包括:
    打草头;
    驱动装置,包括用于驱动所述打草头绕旋转轴线转动的马达;
    所述打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    传动件,相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    其中,在所述传动件处于所述第一位置时,所述打草头处于工作状态,所述传动件随所述线轴同步的绕所述旋转轴线转动;
    在所述传动件处于所述第二位置时,所述打草头处于自主放线状态,所述线轴和所述头壳之间产生相对转动以释放所述打草绳;
    其中,所述传动件的质心偏离所述旋转轴线,在所述打草头被所述马达驱动转动时,所述传动件受到一个使得自身具有由所述第一位置朝向所述第二位置的运动趋势的离心力,所述头壳在绕所述旋转轴线转动时还向所述传动件施加抵抗所述离心力以阻止所述传动件由所述第一位置朝向所述第二位置的运动的阻力;
    在所述打草头处于打草状态且所述打草绳伸出至所述头壳之外的有效部分的长度小于预设值时,所述头壳施加至所述传动件的阻力减小以使所述传动件在离心力作用下由所述第一位置朝向所述第二位置运动。
  22. 根据权利要求21所述的打草机,其中,
    当所述打草绳的有效长度大于该预设值时,所述传动件处于第一位置;当所述打草绳的有效长度小于该预设值时,所述传动件处于第二位置。
  23. 根据权利要求21所述的打草机,其中,
    所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;所述头壳形成有用于与所述驱动部配合的配合部;
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布。
  24. 根据权利要求23所述的打草机,其中,
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且渐变的复位面。
  25. 根据权利要求24所述的打草机,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  26. 根据权利要求21所述的打草机,其中,
    所述线轴上形成有限制所述传动件围绕所述旋转轴线转动的限位部,所述限位部关于一个经过所述第一直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述旋转轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  27. 根据权利要求21所述的打草机,其中,
    所述打草头在被所述马达驱动绕所述第一轴线转动时,所述传动件相对所述线轴具有一个垂直于所述第一轴线的直线方向上的摩擦力,所述摩擦力与所述传动件产生的离心力方向相反。
  28. 根据权利要求21所述的打草机,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  29. 一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:
    线轴,用于缠绕打草绳;
    头壳,围绕形成有用于容纳至少部分所述线轴的容纳空间;
    传动件,相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    其中,在所述传动件处于所述第一位置时,所述传动件随所述线轴同步的绕所述旋转轴线转动,所述打草头处于打草状态;
    在所述传动件处于所述第二位置时,所述线轴和所述头壳之间产生相对转动以释放所述打草绳;
    所述传动件的重心偏离所述旋转轴线,在所述打草头转动时,所述传动件受到一个使得自身具有由所述第一位置朝向所述第二位置的运动趋势的离心力,所述头壳在绕所述旋转轴线转动时还向所述传动件施加抵抗所述离心力以阻止所述传动件由所述第一位置朝向所述第二位置的运动的阻力;
    在所述打草头处于打草状态且所述打草绳伸出至所述头壳之外的有效部分的长度小于预设值时,所述头壳施加至所述传动件的阻力减小以使所述传动件在离心力作用下由所述第一位置朝向所述第二位置运动。
  30. 根据权利要求29所述的打草头,其中,
    所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;所述头壳形成有用于与所述驱动部配合的配合部;
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布;
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且渐变的复位面。
  31. 一种打草机,包括:
    打草头,用于打草;
    驱动装置,包括用于驱动所述打草头绕转动轴线转动的马达;
    所述打草头包括:
    线轴,用于缠绕所述打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    联动装置,用于在所述线轴和所述头壳之间实现动力的传递,所述打草机具有打草状态,且在所述打草机处于所述工作状态时,所述联动装置驱动所述线轴或者所述头壳绕所述转动轴线且沿第一转动方向转动;
    其中,所述联动装置包括:
    传动件,具有阻止所述线轴相对头壳沿所述第一转动方向转动的第一位置和允许所述线轴相对所述头壳沿所述第一转动方向转动的第二位置;
    所述打草头还具有自动绕线状态和自主放线状态;在所述打草头处于自动绕线状态时,所述马达驱动所述线轴相对所述头壳沿所述第二转动方向转动以使所述打草绳缠绕至所述线轴;在所述打草头处于自主放线状态时,所述传动件移动至所述第二位置,所述线轴相对所述头壳沿所述第一转动方向转动以释放打草绳;
    其中,在所述打草头被所述马达驱动转动时,所述传动件受到一个使得自身具有由所述第一位置朝向所述第二位置的运动趋势的离心力,所述头壳在绕所述转动轴线转动时还向所述传动件施加抵抗所述离心力以阻止所述传动件由 所述第一位置朝向所述第二位置的运动的阻力;
    在所述打草头处于工作状态且所述打草绳伸出至所述头壳之外的有效部分的长度小于预设值时,所述头壳施加至所述传动件的阻力减小以使所述传动件在离心力作用下由所述第一位置朝向所述第二位置运动。
  32. 根据权利要求31所述的打草机,其中,
    还包括一个阻尼装置,用于阻尼所述线轴和所述头壳中的至少一个以使所述打草机处于所述自动绕线状态。
  33. 根据权利要求32所述的打草机,其中:
    所述阻尼装置包括:
    阻尼件,用于阻止所述线轴向第一方向转动;
    在所述自动绕线状态下所述头壳向所述第一方向转动。
  34. 根据权利要求32所述的打草机,其中:
    所述阻尼装置包括:
    阻尼件,用于阻止所述头壳向第二方向转动;
    在所述自动绕线状态下所述线轴向第二方向转动。
  35. 根据权利要求31所述的打草机,其中,
    所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;所述头壳形成有用于与所述驱动部配合的配合部;
  36. 根据权利要求31所述的打草机,其中,
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布;
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且具有渐变的复位面。
  37. 根据权利要求36所述的打草机,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  38. 根据权利要求36所述的打草机,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角α大于等于 30°且小于等于50°。
  39. 根据权利要求31所述的打草机,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述第一直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  40. 根据权利要求31所述的打草机,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  41. 一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    传动件,安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;
    其中,所述配合部形成有用于与所述驱动部接触以向所述驱动部施加反作用力的配合面,所述配合面在第一平面内延展,所述第一平面与所述转动轴线基本平行,且所述转动轴线与所述第一平面之间的距离大于0。
  42. 根据权利要求41所述的打草头,其中,
    所述转动轴线与所述第一平面之间的距离大于0且小于等于20mm。
  43. 根据权利要求41所述的打草头,其中,
    所述配合面包括能施加所述反作用力的有效作用面,所述有效作用面在一个垂直于转动轴线的平面内具有一个投影直线,所述投影直线包括第一极限位置和第二极限位置,所述第一极限位置与所述第二极限位置与所述转动轴线的轴心所夹的圆心角大于0°且小于等于45°。
  44. 根据权利要求43所述的打草头,其中,
    所述第一极限位置与所述第二极限位置与所述转动轴线的轴心所夹的圆心角大于等于3°且小于等于40°。
  45. 根据权利要求41所述的打草头,其中,
    所述传动件相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第 一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    所述打草绳具有一个自所述容纳空间延伸出来的有效长度,所述打草绳在有效长度范围内具有一个预设值;当所述打草绳的有效长度大于该预设值时,所述传动件处于第一位置;当所述打草绳的有效长度小于该预设值时,所述传动件处于第二位置。
  46. 根据权利要求41所述的打草头,其中,
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布。
  47. 根据权利要求46所述的打草头,其中,
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且具有渐变的复位面。
  48. 根据权利要求47所述的打草头,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  49. 根据权利要求46所述的打草头,其中,
    所述第二齿的齿尖与齿底分别与转动轴线101的连线构成的圆心角α大于等于30°且小于等于50°。
  50. 根据权利要求41所述的打草头,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述第一直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  51. 一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    传动件,安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;
    其中,所述配合部形成有用于与所述驱动部接触以向所述驱动部施加反作用力的配合面,所述配合面包括能施加所述反作用力的有效作用面,所述有效作用面在一个垂直于转动轴线的平面内具有一个投影直线,所述投影直线包括第一极限位置和第二极限位置,所述第一极限位置与所述第二极限位置与所述转动轴线的轴心所夹的圆心角大于0°且小于等于45°。
  52. 根据权利要求51所述的打草头,其中,
    所述第一极限位置与所述第二极限位置与所述转动轴线的轴心所夹的圆心角大于等于3°且小于等于40°。
  53. 根据权利要求51所述的打草头,其中,
    所述传动件相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    所述打草绳具有一个自所述容纳空间延伸出来的有效长度,所述打草绳在有效长度范围内具有一个预设值;当所述打草绳的有效长度大于该预设值时,所述传动件处于第一位置;当所述打草绳的有效长度小于该预设值时,所述传动件处于第二位置。
  54. 根据权利要求51所述的打草头,其中,
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布。
  55. 根据权利要求54所述的打草头,其中,
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且具有渐变的复位面。
  56. 根据权利要求55所述的打草头,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  57. 根据权利要求54所述的打草头,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
  58. 根据权利要求51所述的打草头,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述第一直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  59. 根据权利要求51所述的打草头,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  60. 一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    传动件,安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;
    其中,所述配合部形成有用于与所述驱动部接触以向所述驱动部施加反作用力的配合面,所述配合面在一个垂直于转动轴线的平面内具有一个投影直线,所述投影直线包括能向所述驱动部施加反作用力第一极限位置和第二极限位置,所述配合面包括能施加所述反作用力的有效作用面,所述有效作用面设置在所述第一极限位置与所述第二极限位置之间。
  61. 一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    传动件,安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;
    其中,所述配合部形成有用于与所述驱动部接触以向所述驱动部施加反作用力的配合面,和用于与所述驱动部接触以向所述驱动部施加反作用力的复位面;当所述驱动部与所述配合面配合时,所述打草头处于工作状态;当所述驱动部与所述复位面配合时,所述打草头处于自主放线状态;
    在所述打草头处于所述自主放线状态且所述驱动部与所述复位面配合时,所述复位面在一个垂直于所述转动轴线的平面内具有一个投影线,所述投影线包括能推动所述传动件复位至与所述配合面配合的第一极限位置和第二极限位置;
    还包括以所述转动轴线的轴心为圆心且经过所述第一极限位置的第一圆周,以所述转动轴线的轴心为圆心且经过所述第二极限位置的第二圆周,所述第一圆周在所述第一极限位置处的切线与所述第二圆周在所述第二极限位置的切线形成的夹角小于等于45°。
  62. 根据权利要求61所述的打草头,其中,
    所述第一圆周在所述第一极限位置处的切线与所述第二圆周在所述第二极限位置的切线形成的夹角小于等于30°。
  63. 根据权利要求61所述的打草头,其中,
    所述传动件相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    所述打草绳具有一个自所述容纳空间延伸出来的有效长度,所述打草绳在有效长度范围内具有一个预设值;当所述打草绳的有效长度大于该预设值时,所述传动件处于第一位置;当所述打草绳的有效长度小于该预设值时,所述传动件处于第二位置。
  64. 根据权利要求61所述的打草头,其中,
    当所述驱动部运动至所述第一极限位置时和所述第二极限位置时,所述打草绳具有作用至所述头壳的反作用力,所述复位面具有推动传动件复位的第一分力和与所述打草绳作用至所述头壳上的反作用力相反的第二分力。
  65. 根据权利要求61所述的打草头,其中,
    所述配合部包括围绕转动轴线分布的第一齿,所述第一齿形成或连接有所述配合面;
    所述头壳形成或连接有可供所述传动件复位的第二齿,所述第二齿形成或连接有所述复位面;所述第一齿和所述第二齿围绕所述转动轴线交错分布。
  66. 根据权利要求65所述的打草头,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转 动的引导通道。
  67. 根据权利要求65所述的打草头,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
  68. 根据权利要求61所述的打草头,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  69. 根据权利要求61所述的打草头,其中,
    所述打草头在被所述马达驱动绕所述转动轴线转动时,所述传动件相对所述线轴具有一个垂直于所述转动轴线的直线方向上的摩擦力,所述摩擦力与所述传动件产生的离心力方向相反。
  70. 根据权利要求61所述的打草头,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  71. 一种打草头,适用于打草机,能被驱动绕转动轴线转动以实现打草,该打草头包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    联动装置,用于在所述线轴和所述头壳之间实现动力的传递;
    其中,所述头壳形成有能供所述打草绳插入所述线轴内部的外穿线孔,所述线轴形成有能供从所述外穿线孔插入所述头壳内部的打草绳结合至所述线轴的结合部;
    所述联动装置包括:传动件,安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;在所述打草头绕所述转动轴线转动时,且在所述传动件在随所述线轴绕转动轴线转动时,所述传动件产生一个沿直线方向的离心力,所述配合部与所述驱动部接触并向所述驱动部施加一个作用力,所述作用力分解为沿垂直于直线方向第一分力和沿所述直线方向且与所述离心力方向相反以阻止所述传动件沿所述直线方向移动的第二分 力。
  72. 根据权利要求71所述的打草头,其中,
    所述线轴形成有内穿线孔,当所述外穿线孔和所述内穿线孔位于同一径向时,所述打草绳能依次穿过所述外穿线孔和所述内穿线孔。
  73. 根据权利要求72所述的打草头,其中,
    所述结合部为一个穿线通道,所述传动通道贯穿所述线轴并连接所述线轴上任意两个内穿线孔。
  74. 根据权利要求73所述的打草头,其中,
    所述穿线通道沿曲线延伸。
  75. 根据权利要求71所述的打草头,其中,
    所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;所述头壳形成有用于与所述驱动部配合的配合部;
  76. 根据权利要求71所述的打草头,其中,
    所述配合部包括围绕转动轴线分布的第一齿;
    所述头壳形成或连接有可供所述传动件复位的第二齿;所述第一齿和所述第二齿围绕所述转动轴线交错分布;
    在一个围绕所述转动轴线的圆周范围内,所述第二齿具有朝向转动轴线分布的齿面,所述齿面具有朝向转动轴线且具有渐变的凸起部。
  77. 根据权利要求76所述的打草头,其中,
    所述齿面包括第一区段和第二区段,所述第一区段与所述第一齿远离所述转动轴线的齿面形成一个可供所述传动件沿一个垂直于所述转动轴线的径向活动的区段;所述第二区段与所述第一齿远离所述转动轴线的齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  78. 根据权利要求76所述的打草头,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角α大于等于30°且小于等于50°。
  79. 根据权利要求71所述的打草头,其中,
    所述线轴上形成有限制所述传动件围绕所述转动轴线转动的限位部,所述限位部关于一个经过所述直线的对称平面对称设置;所述限位部形成可供所述传动件滑动的滑轨,在一个垂直于所述转动轴线的直线方向上,所述限位件与所述限位部至少包括两个接触面。
  80. 根据权利要求71所述的打草头,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
  81. 一种打草头,包括:
    线轴,用于缠绕打草绳;
    头壳,形成有容纳空间,所述线轴至少部分容纳在所述容纳空间内;
    联动装置,用于在所述线轴和所述头壳之间实现动力的传递;
    其中,所述头壳形成有能供所述打草绳插入所述线轴内部的外穿线孔,所述线轴形成有能供从所述外穿线孔插入所述头壳内部的打草绳结合至所述线轴的结合部;
    所述联动装置包括:
    传动件,相对所述线轴具有阻止所述线轴和头壳之间产生相对转动的第一位置和允许所述线轴和所述头壳之间产生相对转动的第二位置;
    在所述传动件处于所述第一位置时,所述打草头处于工作状态,所述传动件随所述线轴同步的绕所述旋转轴线转动;在所述传动件处于所述第二位置时,所述打草头处于自主放线状态,所述线轴和所述头壳之间产生相对转动以释放所述打草绳。
  82. 根据权利要求1所述的打草头,其中,
    所述传动件安装至所述线轴,所述传动件包括用于驱动头壳随所述线轴同步转动的驱动部;
    所述头壳形成有用于与所述驱动部配合的配合部;
    在所述打草头绕所述转动轴线转动,且在所述传动件在随所述线轴绕转动轴线转动时,所述传动件产生一个沿直线方向的离心力,所述配合部与所述驱动部接触并向所述驱动部施加一个作用力,所述作用力分解为沿垂直于直线方向第一分力和沿所述直线方向且与所述离心力方向相反以阻止所述传动件沿所述直线方向移动的第二分力。
  83. 根据权利要求81所述的打草头,其中,
    所述线轴形成有内穿线孔,当所述外穿线孔和所述内穿线孔位于同一径向时,所述打草绳能依次穿过所述外穿线孔和所述内穿线孔。
  84. 根据权利要求83所述的打草头,其中,
    所述结合部为一个穿线通道,所述传动通道贯穿所述线轴并连接所述线轴 上任意两个内穿线孔。
  85. 根据权利要求84所述的打草头,其中,
    所述穿线通道沿曲线延伸。
  86. 根据权利要求1所述的打草头,其中,
    所述打草头在被所述马达驱动绕所述转动轴线转动时,所述传动件相对所述线轴具有一个垂直于所述转动轴线的直线方向上的摩擦力,所述摩擦力与所述传动件产生的离心力方向相反。
  87. 根据权利要求81所述的打草头,其中,
    所述配合部包括围绕转动轴线分布的第一齿,所述第一齿形成或连接有所述配合面;
    所述头壳形成或连接有可供所述传动件复位的第二齿,所述第二齿形成或连接有所述复位面;所述第一齿和所述第二齿围绕所述转动轴线交错分布。
  88. 根据权利要求87所述的打草头,其中,
    所述复位面包括第一区段和第二区段,所述第一区段与所述驱动部基本不产生相互作用力;所述第一齿包括有与所述配合面相交且远离所述转动轴线的齿面,所述第二区段与所述齿面形成一个可供所述传动件围绕所述转动轴线转动的引导通道。
  89. 根据权利要求87所述的打草头,其中,
    所述第二齿的齿尖与齿底分别与转动轴线的轴心构成的圆心角β大于等于30°且小于等于50°。
  90. 根据权利要求81所述的打草头,其中,
    所述线轴还形成或连接有一个容纳槽,所述容纳槽内设置有一个偏压元件,所述偏压元件一端抵持所述容纳槽的槽底,另一端抵持所述传动件。
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