CN215601946U

CN215601946U - Rear-walking type self-pushing working machine

Info

Publication number: CN215601946U
Application number: CN202120893833.0U
Authority: CN
Inventors: 朱荣根
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2022-01-25
Anticipated expiration: 2031-04-27

Abstract

The utility model discloses a backward-walking self-pushing working machine, which comprises: the main machine comprises a walking component and a motor for driving the walking component; a handle device connected to the host; the handle device includes: an operating member including a grip portion for a user to grip; a connecting rod assembly including a first connecting rod connected to the main body; a pressure sensor for sensing a thrust force applied to the handle device to drive the walk-behind self-propelled working machine, wherein the walk-behind self-propelled working machine further includes a trigger for applying a force to the pressure sensor and a support made of a first material, the trigger forming or being connected with a slider, the support supporting the slider, the slider being made of a second material different from the first material; when the operating member is pushed, relative movement is generated between the support member and the slider, which deforms the pressure sensor. The backward-walking type self-propelled working machine has high reliability.

Description

Rear-walking type self-pushing working machine

Technical Field

The utility model relates to a garden tool, in particular to a walk-behind self-propelled working machine.

Background

The lawn mower is a rear-walking self-propelled working machine, and a user can stand at the rear side of the lawn mower to push the lawn mower to walk so as to trim domestic lawn. When a user pushes the lawn mower on the lawn for a long time to trim the lawn, a large physical force is consumed. In order to reduce the labor intensity of operators in mowing, self-walking mowers are available on the market. In some existing lawn mowers with self-propelled function, the self-propelled function needs to be controlled manually, and only a constant speed can be output, so that a user can only follow the lawn mower and carry out the lawn mowing operation. In some lawn mowers capable of adapting to the walking speed of users, self-walking systems contained in the lawn mowers are complex in structure and many in parts, and the self-walking systems are prone to failure or reduced in detection accuracy after long-term use.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide the backward-walking type self-propelled working machine which is higher in reliability and more accurate in detection.

In order to achieve the above object, the present invention adopts the following technical solutions:

a walk-behind, self-propelled work machine comprising: the main machine comprises a walking component and a motor for driving the walking component; a handle device connected to the host; the handle device includes: an operating member including a grip portion for a user to grip; a connecting rod assembly including a first connecting rod connected to the main body; a pressure sensor for sensing a thrust force applied to the handle device to drive the walk-behind self-propelled working machine, wherein the walk-behind self-propelled working machine further includes a trigger for applying a force to the pressure sensor and a support made of a first material, the trigger forming or being connected with a slider, the support supporting the slider, the slider being made of a second material different from the first material; when the operating member is pushed, relative movement is generated between the support member and the slider, which deforms the pressure sensor.

In some embodiments, the maximum amount of relative movement of the support member with respect to the slide member is less than or equal to 2 mm.

In some embodiments, the coefficient of friction between the support and the slider is greater than 0 and equal to or less than 0.3.

In some embodiments, the coefficient of friction between the support and the slider is greater than 0 and equal to or less than 0.1.

In some embodiments, the support member is a metal member and the sliding member is a plastic member.

In some embodiments, the first material is a first metal and the second material is a second metal.

In some embodiments, the support member is formed with a support hole centered on the first straight line, and the slider member is at least partially disposed within the support hole; the support hole includes a first hole wall portion having a first inner diameter and a second hole wall portion having a second inner diameter, the sliding member is in contact with the first hole wall portion, the sliding member is also in contact with the second hole wall portion, and the first inner diameter is larger than the second inner diameter.

In some embodiments, the first aperture wall portion and the second aperture wall portion are located at different positions on the first straight line.

In some embodiments, the support member is coupled to the operating member and the slider member is coupled to the connecting rod assembly.

In some embodiments, the handle device further includes a housing formed with a first receiving cavity into which the first connecting rod extends, and the pressure sensor is disposed outside the housing.

In some embodiments, the operating member is formed with a second accommodating chamber, and the pressure sensor is disposed in the second accommodating chamber.

In some embodiments, the operating member is disposed outside the housing and the support member is at least partially disposed within the housing.

The utility model has the advantages that: the pressure sensor of the backward-walking self-propelled working machine is more accurate in detection and higher in reliability.

Drawings

Fig. 1 is a perspective view of a walk-behind self-propelled working machine;

FIG. 2 is a perspective view of a handle arrangement of a portion of the walk-behind self propelled working machine of FIG. 1;

FIG. 3 is a plan view of the structure shown in FIG. 2;

FIG. 4 is a cross-sectional view of the structure shown in FIG. 2;

FIG. 5 is an enlarged view of a portion of the area of FIG. 4;

FIG. 6 is an enlarged view of the support, slider and pretensioning element of FIG. 5;

FIG. 7 is a plan view of the portion of the handle arrangement of FIG. 3 with the operating member separated;

FIG. 8 is an enlarged view of a portion of the area of FIG. 7;

FIG. 9 is a plan view of the structure of FIG. 7 with a portion of the housing removed;

FIG. 10 is an enlarged view of a portion of the area of FIG. 9;

FIG. 11 is an exploded view of a portion of the handle arrangement of FIG. 2;

FIG. 12 is a cross-sectional view of the pressure sensor and trigger member of FIG. 4 with the pressure sensor substantially undeformed;

FIG. 13 is a cross-sectional view of the pressure sensor and trigger of FIG. 4 with the pressure sensor deformed;

FIG. 14a is a plan view of another embodiment trigger member;

FIG. 14b is a plan view of another embodiment of a pressure sensor and trigger;

FIG. 14c is a plan view of a pressure sensor and trigger of yet another embodiment;

FIG. 15 is a perspective view of a handle arrangement in another embodiment of a lawn mower;

FIG. 16 is a plan view of the handle arrangement of FIG. 15;

FIG. 17 is a cross-sectional view of the handle arrangement of FIG. 15;

FIG. 18 is a perspective view of the handle arrangement of FIG. 15 with the first housing portion removed;

FIG. 19 is an enlarged view of a portion of the area of FIG. 17;

fig. 20 is an enlarged view of a portion of the area in fig. 18.

Detailed Description

The utility model is described in detail below with reference to the figures and the embodiments.

The walk-behind self-propelled working machine as shown in fig. 1 is embodied as a lawnmower 300 for trimming grass. In other embodiments, the walk-behind self-propelled working machine may also be a snow sweeper, a small cart or other working machines with self-propelling functions.

As shown in fig. 1, the lawn mower 300 includes: a main body 301 and a handle device 30. The host 301 includes: blade assembly 302, chassis 303, running assembly 304, and motor 305. The blade assembly 302 is used to perform the cutting function, the chassis 303 is used to house the blade assembly 302, the traveling assembly 304 supports the chassis 303, the motor 305 is used to drive the blade assembly 302 to rotate, and the motor 305 can also drive the traveling assembly 304 to rotate.

The handle device 30 is connected to the host 301, and the handle device 30 is connected to the rear end of the host 301. The handle means 30 is for operation by a user. The handle assembly 30 is also rotatable relative to the main body 301 to accommodate users of different heights. The handle device 30 can also rotate to a folded state relative to the main body 301, and at this time, the lawn mower 300 occupies a small space, so that the lawn mower 300 can be conveniently stored.

As shown in fig. 1 to 6, the handle device 30 includes: the operating member 31, the connecting rod assembly 32, the housing 33, the sensing device 34a, the triggering assembly 35 and the pretensioning element 36, wherein the sensing device 34a comprises the pressure sensor 34. The operating member 31 includes a holding portion 311, a first mounting portion 312, and a second mounting portion 313, the holding portion 311 is used for being held by a user, and the first mounting portion 312 and the second mounting portion 313 are respectively provided at both ends of the holding portion 311. In the present embodiment, the first mounting portion 312 extends along a first straight line 300a, and the second mounting portion 313 extends along a second straight line 300b parallel to the first straight line 300 a. When the user needs to push the lawn mower 300 to mow the lawn, the user may stand at the rear side of the handle device 30 and hold the grip 311 with a hand to apply a forward pushing force to the grip 311, so that the lawn mower 300 may be driven to walk on the ground.

The connecting rod assembly 32 is used to connect the operating member 31 and the main body 301. The connecting rod assembly 32 includes a first connecting rod 321 and a second connecting rod 322, one end of the first connecting rod 321 is connected to the main body 301, and the other end is connected to the first mounting portion 312. One end of the second link lever 322 is connected to the main unit 301, and the other end is connected to the second mounting portion 313. The first connecting rod 321 extends along a first straight line 300a, and the second connecting rod 322 extends along a second straight line 300b parallel to the first straight line 300 a.

The housing 33 extends in the left-right direction, and the housing 33 connects the first connecting rod 321 and the second connecting rod 322. The handle device 30 further includes a trigger 390 for actuating the blade assembly 302, the trigger 390 being rotatably coupled to the housing 33. The housing 33 is formed with a first receiving cavity 331, and the first connecting rod 321 extends into the first receiving cavity 331 along a first straight line 300 a. The housing 33 is also in fixed connection with the connecting rod assembly 32.

The pressure sensor 34 is used to sense the pushing force applied to the handle arrangement 30 to drive the mower 300 forward. In the present embodiment, the pressure sensor 34 is a resistance strain gauge sensor. In other embodiments, the pressure sensor may also be a piezoelectric film type sensor, or the pressure sensor may also be a ceramic type sensor. The trigger assembly 35 can apply a force to the pressure sensor 34 when the grip portion 311 is pushed, and the trigger assembly 35 can drive the pressure sensor 34 to deform. Thus, when the user pushes the grip 311, the trigger assembly 35 applies a force to the pressure sensor 34, and the pressure sensor 34 deforms and generates an electrical signal. The mower 300 may further comprise signal processing means to which the electrical signal generated by the pressure sensor 34 is sent, and a controller to which the signal processing means sends the processed signal, which in turn controls the mower 300 to walk on the ground and causes the mower 300 to accelerate when the user-applied thrust increases and also causes the mower 300 to decelerate when the user-applied thrust decreases. When the user accelerates walking, the thrust applied to the handle device 30 by the user increases, and the controller also controls the forward speed of the mower 300 to increase. Likewise, when the user decelerates walking, the pushing force applied by the user to the handle device 30 decreases, and the controller also controls the forward speed of the mower 300 to decrease. Therefore, the advancing speed of the mower 300 is adapted to the walking speed of the user, the phenomenon that the mower 300 pulls the user to run is avoided, and the use comfort of the user is improved.

In the present embodiment, the ratio of the component force of the pushing force received by the grip portion 311 in the direction of the first straight line 300a to the amount of deformation of the pressure sensor 34 in the direction of the first straight line 300a is not less than 40N/mm and not more than 1200N/mm. Alternatively, in another embodiment, the ratio of the component force of the pushing force received by the grip 311 along the first straight line 300a to the deformation of the pressure sensor 34 along the first straight line 300a is greater than or equal to 1200N/mm and less than or equal to 5000N/mm.

In the present embodiment, the pressure sensor 34 is connected to the operation member 31, and the trigger assembly 35 is connected to the connecting rod assembly 32. Thus, the pressure sensor 34 and the operation member 31 constitute a first unit movable together, and the trigger unit 35 and the link unit 32 constitute a second unit movable together. Thus, the position of the trigger assembly 35 in the direction of the first line 300a following the link rod assembly 32 is maintained, while the pressure sensor 34 moves along with the operating member 31, thereby reducing the number of moving parts, facilitating the installation of the pressure sensor 34 and the trigger assembly 35, and simplifying the structure of the mower 300. Meanwhile, because the operating member 31 may be deformed or shaken during operation, for example, positions of the first mounting portion 312 and the second mounting portion 313 are changed, the position of the trigger assembly 35 relative to the connecting rod assembly 32 in the direction of the first straight line 300a is kept fixed, so that the connecting rod assembly 32 can relatively stably apply an acting force to the pressure sensor 34, thereby improving the detection accuracy of the pressure sensor 34 and also ensuring that the lawn mower 300 is reliable after long-term use.

Specifically, as shown in fig. 5 to 11, in the present embodiment, the trigger assembly 35 includes: a trigger 351 and a slider 352, the trigger 351 being adapted to contact the pressure sensor 34 to apply a force to the pressure sensor 34. The slider 352 is used to connect the triggering member 351 to the first connecting rod 321, and in this embodiment, the slider 352 and the triggering member 351 are two distinct pieces. In other embodiments, the slider 352 may be integrally formed with the trigger 351. In the present embodiment, the slider 352 is connected to the link assembly 32 by a connecting pin 391, the connecting pin 391 extending in a direction perpendicular to the first straight line 300 a.

The operating member 31 is formed with a second accommodating chamber 314, and the second accommodating chamber 314 is formed at one end of the first mounting portion 312 remote from the grip portion 311. Second receiving chamber 314 is open to connector rod assembly 32, and pressure sensor 34 is disposed within second receiving chamber 314. In the present embodiment, the pressure sensor 34 is mounted to the first mounting portion 312, and the pressure sensor 34 is fixedly connected to the first mounting portion 312 by a screw 392. The triggering assembly 35 is mounted to the connecting rod assembly 32, and specifically, the sliding member 352 of the triggering assembly 35 is fixedly connected to the first connecting rod 321, and the positions of the sliding member 352 and the triggering member 351 in the direction of the first line 300a are kept in synchronization. The pressure sensor 34 is disposed outside the housing 33, which facilitates assembly of the pressure sensor 34. When the pressure sensor 34 is severely deformed after long-term use or the pressure sensor 34 detects a failure, the user can replace the pressure sensor 34 more conveniently. In other embodiments, it is also possible to have the pressure sensor mounted to the connecting rod assembly and the trigger assembly mounted to the first mounting portion.

As shown in fig. 5, 8 and 10, the triggering member 351 is at least partially disposed in the second receiving chamber 314. As shown in fig. 10 to 13, the trigger 351 includes a trigger portion 351a, and the trigger portion 351a includes a trigger surface 351b for contacting the pressure sensor 34. In this embodiment, the triggering member 351 is a ball, the triggering portion 351a is a spherical portion, and the triggering surface 351b is a spherical surface. The pressure sensor 34 is formed with a hole, specifically, a through hole 341, and a spherical surface is inserted into the through hole 341 to contact an edge of the through hole 341. In other embodiments, the hole formed in the pressure sensor for contact with the trigger may also be a blind hole. As shown in fig. 12, when the triggering member 351 is in contact with the pressure sensor 34 but no force or a small force F is applied to the pressure sensor 34, the position of the through hole 341 is not substantially changed, and the triggering surface 351b is in contact with the edge of the through hole 341 and applies a uniform force F to one turn of the edge, so that the force F applied by the triggering member 351 to the pressure sensor 34 extends along the first straight line 300 a. As shown in fig. 13, when the trigger 351 applies a large force F to the pressure sensor 34, the pressure sensor 34 deforms, the position of the through hole 341 changes, but the through hole 341 is still symmetrical with respect to the plane passing through the first straight line 300a, so that the force F applied by the trigger 351 to the pressure sensor 34 still extends along the first straight line 300 a. In this way, the spherical surface on the triggering member 351 is in contact with the through hole 341, so that the acting force F received by the pressure sensor 34 extends substantially along the first straight line 300a, thereby improving the detection accuracy. The ball portion is a part of one ball. The ball portion may be part of a standard ball or may be part of a ball-like shape, for example a duck egg-like shape. That is, the shape of the sphere portion is not strictly required to be a part of a standard sphere, and all the solutions that can substantially achieve the technical effect of the present invention of improving the detection accuracy are within the protection scope of the present invention.

In the present embodiment, the area of the projection of the triggering surface 351b in the plane perpendicular to the first straight line 300a is larger than the area of the projection of the through-hole 341 in the plane. Thus, even when the pressure sensor 34 is deformed, the ball rotates, and the trigger surface 351b is always in contact with the through hole 341 by the spherical surface. The projection of the portion of the triggering surface 351b in contact with the through hole 341 in a plane perpendicular to the first straight line 300a is still symmetrical with respect to the first straight line 300a, so that the force F exerted by the triggering surface 351b on the pressure sensor 34 still extends along the first straight line 300 a.

The pressure sensor 34 is connected to the operating member 31, the triggering member 351 is disposed between the pressure sensor 34 and the connecting rod assembly 32, and the position of the triggering member 351 relative to the connecting rod assembly 32 in the direction along the first straight line 300a is kept fixed, so that the detection error caused by the position movement of the ball can be further reduced. In other embodiments, the pressure sensor may be coupled to the linkage assembly and the trigger member may be coupled to the operating member, the trigger member being a ball disposed between the operating member and the pressure sensor, the pressure sensor being held fixed relative to the linkage assembly in the first linear direction.

It is understood that the triggering surface 351b is at least a portion of a spherical surface. In this embodiment, the triggering surface 351b is a complete sphere.

In other embodiments, the trigger may not be shaped as a ball. For example, in the embodiment shown in fig. 14, the triggering member 451 includes a main body portion 451c and a spherical portion 451a for contacting the pressure sensor, the spherical portion 451a is a part of a sphere, and the triggering surface 451b formed by the spherical portion 451a for contacting the pressure sensor is a half sphere. Similarly, it will be appreciated that in other embodiments, the spherical portion 451a may be integrally formed with the slider such that a force in the direction of the first line 300a may be applied to the pressure sensor as long as the slider has a spherical portion 451a formed at its end.

In the embodiment shown in fig. 14a, the triggering surface 451b is a half sphere. In other embodiments, the ratio of the area of the trigger surface to the spherical surface corresponding thereto may be any value.

In the embodiment shown in fig. 14b, the pressure sensor 452 is formed with a triggered surface 452a for contacting the triggering surface 453a of the triggering member 453, the triggered surface 452a is shaped as a portion of a sphere, and the triggering surface 453a may be a flat surface. In this embodiment, the triggered surface 452a is a hole wall of a hole, and the hole wall is a part of a spherical surface.

Alternatively, as shown in fig. 14c, the triggered surface 454a formed by the pressure sensor 454 is a surface of a sphere portion protruding upwards, the surface of the sphere portion is a part of a spherical surface, and the triggering surface 455a of the triggering member 455 can be a plane surface.

The pretensioning element 36 is used to bias the trigger assembly 35 such that the trigger assembly 35 applies a pretension to the pressure sensor 34. In this way, the nonlinear electrical signal output by the pressure sensor 34 at the time of the initial deformation can be filtered out, thereby improving the accuracy of the processed signal of the signal processing device.

The handle device 30 further includes a support 37, the support 37 is used for supporting the sliding member 352, and the support 37 is disposed in the first accommodating chamber 331 formed in the housing 33. The support 37 is also fixedly connected to the operating member 31. The support 37 can also be considered as part of the first entity, so that the support 37, the operating member 31 and the pressure sensor 34 constitute the first entity described above. When the user applies a pushing force to the grip portion 311, the support member 37, the operation member 31, and the pressure sensor 34 together generate a slight movement in the direction of the first straight line 300a with respect to the second body. It should be noted that the distance of the movement of the first body relative to the second body is less than or equal to 3 mm, and the movement of the first body relative to the second body is used for providing a stroke for the trigger 351 to deform the pressure sensor 34. That is, the first body moves along the first straight line 300a by the same distance as the moving stroke of the triggering member 351 and the magnitude of the deformation of the pressure sensor 34. Therefore, the movement of the operation member 31, the pressure sensor 34, and the support member 37 with respect to the link assembly 32 is very small, and the user does not substantially feel the movement of the operation member 31, the pressure sensor 34, and the support member 37 with respect to the link assembly 32. Alternatively, it is also considered that the user does not move the operation member 31, the pressure sensor 34, and the support member 37 relative to the link assembly 32.

In the present embodiment, the operation member 31 and the pressure sensor 34 are both disposed outside the housing 33, and the support member 37 is disposed inside the housing 33. The screw 392 passes through the support 37, the pressure sensor 34 and the operating member 31 in this order, thereby fixedly connecting the three together as a first unit. The support member 37 is formed with a support hole 371, and the slider 352 includes a sliding portion 352a provided inside the support hole 371 and a driving portion 352b contacting the trigger 351. The pretensioner element 36 is disposed in the first accommodation chamber 331 formed in the housing 33, and the pretensioner element 36 biases the driving portion 352 b. In the present embodiment, the biasing element 36 is a spring, and further, the biasing element 36 is a belleville spring, which is fitted over the sliding portion 352a and supports the driving portion 352 b. In other embodiments, the pretensioning element 36 can also be a helical spring, and the pretensioning element 36 can also be a rubber. The pretensioning element 36 indirectly biases the triggering member 351 through the slider 352, so that the triggering member 351 is always in contact with the pressure sensor 34.

When the operating member 31 is pushed, the first body moves relative to the second body, the support member 37 moves relative to the sliding member 352 along the first line 300a to deform the pressure sensor 34 by the same stroke as the first body moves relative to the second body, and the maximum value of the relative movement of the support member 37 relative to the sliding member 352 is 3 mm or less. In the present embodiment, in fact, the sliding member 352 is fixed relative to the main frame 301, and the supporting member 37 moves together with the operating member 31 relative to the main frame 301, so that the supporting member 37 and the sliding member 352 move relatively. Because the movement is relative, the support member 37 moves relative to the slider 352, which can also be considered as movement of the slider 352 relative to the support member 37.

In other embodiments, the slider 352 may be formed with a sliding hole into which the support 37 extends to support the slider 352.

In this embodiment, the support 37 is made of a first material and the slider 352 is made of a second material, different from the first material. The supporting member 37 and the sliding member 352 are made of different materials, respectively, so that the supporting member 37 and the sliding member 352 have different viscosities, thereby reducing the friction coefficient between the supporting member 37 and the sliding member 352. In this way, when the relative movement is generated between the support 37 and the slider 352, the friction force generated between the support 37 and the slider 352 is small, so that the pressure sensor 34 can sense the pushing force applied to the grip 311 by the user more accurately, the detection accuracy of the pressure sensor 34 is improved, and the reliability of the lawnmower 300 is improved.

The coefficient of friction between the support 37 and the slider 352 is greater than 0 and equal to or less than 0.3, which makes the force transmitted to the pressure sensor 34 more accurate. Further, the friction coefficient between the support 37 and the slider 352 is greater than 0 and equal to or less than 0.1. In order to further reduce the influence of the frictional force between the support 37 and the slider 352 on the pushing force applied by the user, the coefficient of friction between the support 37 and the slider 352 is greater than 0 and equal to or less than 0.05.

Specifically, in the present embodiment, the supporting member 37 is a metal member, and the sliding member 352 is a plastic member. In other embodiments, the supporting member may be a plastic member, and the sliding member may be a metal member. Alternatively, in one embodiment, the first material is a first metal and the second material is a second metal, i.e., the support and the slider are each made of two different metal materials.

The surface roughness Ra of the support 37 is 10 nm or less, and the surface roughness Ra of the slider 352 is 10 nm or less. More specifically, the surface roughness Ra of the support 37 is 3.2 nm or less, and the surface roughness Ra of the slider 352 is 3.2 nm or less. In this way, when the support member 37 and the slider 352 are relatively moved, the friction force between the support member 37 and the slider 352 is small, so that the measurement value of the thrust detected by the pressure sensor 34 is more accurate. In other embodiments, the support member and the sliding member may be made of the same material, for example, the support member and the sliding member are made of plastic. In this case, in order to reduce the friction factor between the support member and the sliding member, the surface of the support member or the sliding member may be plated with a metal layer, for example, chrome-plated on the surface of the support member or the sliding member, so that the surface roughness of the support member and the sliding member may be reduced. It should be noted that, when the surface of the supporting member or the sliding member is plated with the material layer, the surface roughness of the supporting member or the sliding member refers to the surface roughness of the material layer.

As shown in fig. 6, the support hole 371 is centered on the first straight line 300 a. The sliding portion 352a is partially disposed in the support hole 371. The support hole 371 has a first hole wall portion 371a and a second hole wall portion 371 b. The first hole wall portion 371a and the second hole wall portion 371b are located at different positions in the direction along the first straight line 300 a. The first aperture wall portion 371a has a first inner diameter and the second aperture wall portion 371b has a second inner diameter, the first inner diameter being greater than the second inner diameter. That is, the first hole wall portion 371a and the second hole wall portion 371b are cylindrical holes having different inner diameters, respectively. The slider 352 is formed with a step structure 352c so that the slider 352 can be brought into contact with both the first hole wall portion 371a and the second hole wall portion 371b, and thus the contact area of the slider 352 with the support 37 can be reduced, thereby further reducing the influence of the force exerted by the slider 352 and the support 37 upon the relative movement, and further improving the accuracy of the pushing force applied to the grip portion 311 by the user detected by the pressure sensor 34.

Fig. 15 shows a perspective view of a handle device 50 of another lawn mower, which may be another walk-behind self-propelled working machine having a handle device 50. As shown in fig. 15 to 20, the lawn mower may have the same main body as the lawn mower 300, and the handle device 50 have the same operating member 51, connecting rod assembly 52, sensing device 54a, trigger assembly 55 and pretensioning element. The main differences are: the housing 33 in the mower 300 is fixedly connected to the connecting rod assembly 32, and the housing 53 in the mower is fixedly connected to the operating member 51. The structure of the lawn mower 300 that can be applied to the present embodiment may be the same as that of the present embodiment, and will not be described in detail.

The operating member 51 includes a grip portion 511 for being gripped by a user, and both ends of the grip portion 511 in an extending direction thereof are defined as a first end 511a and a second end 511b, respectively. The operating member 51 further includes a first mounting portion 512 and a second mounting portion 513, the first mounting portion 512 including a first mounting end 512a for mounting the sensing device 54a or the trigger 551, and the second mounting portion 513 including a second mounting end 513a for mounting the sensing device 54a or the trigger 551. The sensing device 54a comprises a pressure sensor 54 for sensing the thrust applied to the handle device 50 to actuate the mower, and the trigger 551 is capable of applying a force to the pressure sensor 54 to actuate the deformation of the pressure sensor 54 when the grip 511 is subjected to the thrust. The first mounting portion 512 is disposed at a first end 511a of the grip portion 511, and the second mounting portion 513 is disposed at a second end 511b of the grip portion 511. In the present embodiment, the first mounting end 512a is formed with a first mounting cavity 512b, the second mounting end 513a is formed with a second mounting cavity, the number of the pressure sensors 54 is 2, and the two pressure sensors 54 are respectively disposed in the first mounting cavity 512b and the second mounting cavity. Trigger 551 is capable of applying a force to pressure sensor 54 in the direction of first line 500 a.

The handle device 50 further includes a support member 57 for supporting the operating member 51 and fixedly connected to the operating member 51, and the pressure sensor 54 is also fixedly connected to the support member 57 and the operating member 51. The trigger assembly 55 further includes a slider 552, the slider 552 being fixedly coupled to the connecting rod assembly 52. The support member 57 is also formed with a support hole 571 through which the slider 552 passes to contact the trigger 551. When a user applies a force to the grip portion 511, the first unit including the operating member 51, the support member 57, and the pressure sensor 54 is slightly displaced relative to the second unit including the trigger member 551, the slider 552, and the link assembly 52, and the trigger member 551 deforms the pressure sensor 54 by the slight displacement, so that the pressure sensor 54 outputs a signal. This slight displacement is the same amount as the deformation occurring in the pressure sensor 54.

In the present embodiment, the housing 53 fixedly connects the first mounting end 512a and the second mounting end 513a, and therefore, the housing 53 may also be referred to as a connector for fixedly connecting the first mounting end 512a and the second mounting end 513 a. For convenience of explanation, the housing 53 is used instead of the connecting member to explain the technical solution of the present invention, and in fact, the housing 53 is also the connecting member. The first mounting portion 512 extends in the same direction as the first link 521, and the second mounting portion 513 extends in the same direction as the second link 522. The first mounting portion 512 extends along a first straight line 500a, and the second mounting portion 513 extends in a direction parallel to the first straight line 500 a. The grip portion 511 is fixedly coupled to upper ends of the first and second mounting

portions

512 and 513, and the housing 53 is fixedly coupled to lower ends of the first and second mounting

portions

512 and 513. In this way, the housing 53 may ensure that the distance L1 between the first mounting end 512a and the second mounting end 513a remains substantially constant. In one aspect, trigger 551 is capable of applying a force to pressure sensor 54 substantially along first line 500 a. On the other hand, the housing 53 can prevent the frictional force between the support 57 and the slider 552 from increasing due to the change in the distance L1 between the first mounting end 512a and the second mounting end 513a, thereby reducing the influence of the frictional force between the support 57 and the slider 552 on the acting force. The housing 53 fixedly connects the first mounting end 512a and the second mounting end 513a, so that the pressure sensor 54 can more accurately detect the pushing force applied to the grip 511 by the user, and the detection accuracy is improved. The housing 53 is fixedly connected to the first mounting end 512a and the second mounting end 513a, and the housing 53 is not limited to being directly connected to the first mounting end 512a or the second mounting end 513a, and the housing 53 is indirectly fixed to the first mounting end 512a and the second mounting end 513a through other components. For example, in the present embodiment, a portion of the housing 53 is disposed between the first connecting rod 521 and the second connecting rod 522, two ends of the housing 53 are respectively fixedly connected to the two supporting members 57, and the two supporting members 57 are respectively fixedly connected to the first mounting portion 512 and the second mounting portion 513, so that the housing 53 is fixedly connected to the first mounting portion 512 and the second mounting portion 513.

One end of the first mounting portion 512 is connected to the first end 511a of the holding portion 511, the other end is a first mounting end 512a, and the first mounting end 512a is far away from the first end 511 a. One end of the second mounting portion 513 is connected to the second end 511b of the holding portion 511, the other end is a second mounting end 513a, and the second mounting end 513a is far away from the second end 511 b.

The housing 53 is formed with a first accommodating chamber 531, the connecting rod assembly 52 is inserted into the first accommodating chamber 531, the support 57 is at least partially disposed in the first accommodating chamber 531, the housing 53 is fixedly connected to the support 57, and the support 57 is fixedly connected to the operating member 51 and the pressure sensor 54. The pressure sensor 54 is disposed outside the first accommodating chamber 531, and the pressure sensor 54 is disposed in the first mounting chamber 512b and the second mounting chamber.

The housing 53 specifically includes: the first and

second housing portions

53a and 53b are separable from each other, and the first and

second housing portions

53a and 53b can be integrally joined together. When the first and

second housing portions

53a and 53b are butted, the first and

second housing portions

53a and 53b surround to form a first receiving chamber 531 into which the link assembly 52 is inserted. In other embodiments, the operating member 51 may be inserted into the first accommodating chamber 531. The handle arrangement 50 further comprises a mounting 58, the mounting 58 being for fixedly connecting the housing 53 to the support 57. In this embodiment, the supporting member 57 includes a protrusion 572 protruding outside the housing 53, and the mounting member 58 includes a screw passing through the first housing part 53a, the protrusion 572, and the second housing part 53b in this order, thereby fixedly connecting the housing 53 and the supporting member 57.

A distance L2 between the grip 511 and the housing 53 in the direction along the first straight line 500a is 40 mm or more and 200 mm or less. The ratio of the distance L2 between the housing 53 and the grip 511 to the dimension L3 of the operating piece 51 in the direction of the first straight line 500a is 0.5 or more and less than 1. In this way, the distance between the housing 53 and the grip portion 511 is made sufficiently large, so that the distance between the first mounting portion 512 and the second mounting portion 513 can be better secured.

When the first mounting end 512a and the second mounting end 513a are not fixedly connected through the housing 53, the operating element 51 may cause a change in a distance L1 between the first mounting end 512a and the second mounting end 513a due to a difference in a direction of a pushing force applied by a user, or a change in a distance L1 between the first mounting end 512a and the second mounting end 513a due to a deformation of the operating element 51 caused by long-term operation, or a change in a distance L1 between the first mounting end 512a and the second mounting end 513a due to collision of the operating element 51 with another object, which may cause a measured value of the pushing force detected by the pressure sensor 54 to be different from an actual value of the pushing force applied to the grip portion 511 by the user, thereby affecting that the speed of the controller control motor cannot be adapted to the walking speed of the user or the pushing force applied by the user. For example, when the housing 53 is not coupled to the first and second mounting ends 512a and 513a, the distance L1 between the first and second mounting ends 512a and 513a may vary between L ± 3 millimeters. When the housing 53 is fixedly connected to the first mounting end 512a and the second mounting end 513a, the distance L1 between the first mounting end 512a and the second mounting end 513a varies within L ± 0.5 mm, which greatly reduces the variation of the distance between the first mounting end 512a and the second mounting end 513a of the operating member 51, thereby improving the detection accuracy of the pressure sensor 54.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A walk-behind, self-propelled work machine comprising:

the main machine comprises a walking component and a motor for driving the walking component;

a handle device connected to the host;

the handle device includes:

an operating member including a grip portion for a user to grip;

a connecting rod assembly including a first connecting rod connected to the main body;

a pressure sensor for sensing a thrust force applied to the handle device to drive the walk-behind self-propelled working machine;

the rear-walking self-pushing working machine is characterized by further comprising a trigger piece and a supporting piece, wherein the trigger piece is used for applying acting force to the pressure sensor, the supporting piece is made of a first material, a sliding piece is formed by or connected with the trigger piece, the supporting piece supports the sliding piece, and the sliding piece is made of a second material different from the first material; when the operating piece is pushed, relative movement is generated between the supporting piece and the sliding piece, and the pressure sensor is deformed.

2. The walk-behind, self-propelled working machine according to claim 1, wherein: the maximum value of the relative movement of the supporting piece relative to the sliding piece is less than or equal to 2 mm.

3. The walk-behind, self-propelled working machine according to claim 1, wherein: the coefficient of friction between the support and the slider is greater than 0 and equal to or less than 0.3.

4. The walk-behind, self-propelled working machine according to claim 1, wherein: the coefficient of friction between the support and the slider is greater than 0 and equal to or less than 0.1.

5. The walk-behind, self-propelled working machine according to claim 1, wherein: the support piece is a metal piece, and the sliding piece is a plastic piece.

6. The walk-behind, self-propelled working machine according to claim 1, wherein: the first material is a first metal and the second material is a second metal.

7. The walk-behind, self-propelled working machine according to claim 1, wherein: the support part is provided with a support hole taking a first straight line as a center, and the sliding part is at least partially arranged in the support hole; the support hole includes a first hole wall portion having a first inner diameter and a second hole wall portion having a second inner diameter, the slider being in contact with the first hole wall portion and the slider also being in contact with the second hole wall portion, the first inner diameter being greater than the second inner diameter.

8. The walk-behind, self-propelled working machine according to claim 7, wherein: the first aperture wall portion and the second aperture wall portion are located at different positions on the first straight line.

9. The walk-behind, self-propelled working machine according to claim 1, wherein: the supporting piece is connected with the operating piece, and the sliding piece is connected with the connecting rod assembly.

10. The walk-behind, self-propelled working machine according to claim 9, wherein: the handle device further comprises a shell, a first containing cavity is formed in the shell, the first connecting rod extends into the first containing cavity, and the pressure sensor is arranged outside the shell.

11. The walk-behind, self-propelled working machine according to claim 10, wherein: the operating member is formed with a second accommodating chamber in which the pressure sensor is disposed.

12. The walk-behind, self-propelled working machine according to claim 11, wherein: the operating member is disposed outside the housing and the support member is at least partially disposed within the housing.