CN115245086B

CN115245086B - Back-walking self-pushing working machine

Info

Publication number: CN115245086B
Application number: CN202110457354.9A
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: 2024-03-15
Anticipated expiration: 2041-04-27
Also published as: CN115245086A

Abstract

The invention discloses a back-walking self-pushing working machine, which comprises: the host machine comprises a walking assembly and a motor for driving the walking assembly; 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 host; the shell is provided with a first accommodating cavity, and the first connecting rod stretches into the first accommodating cavity; the sensing device is used for sensing the thrust applied to the handle device to drive the back-running self-propelled working machine; the trigger assembly can apply acting force to the sensing device when the holding part is pushed to drive the sensing device to deform; wherein, trigger the subassembly and be connected to the connecting rod subassembly, sensing device is connected to the operating element. The back-walking type self-pushing working machine is convenient to operate and high in reliability.

Description

Back-walking self-pushing working machine

Technical Field

The invention relates to a garden tool, in particular to a backward walking type self-pushing working machine.

Background

The mower is a walk-behind self-propelled working machine, and a user can stand on the rear side of the mower to push the mower to walk so as to trim the household lawn. When a user pushes the mower on the lawn for a long time to trim the lawn, the user can consume larger physical power. In order to reduce the labor intensity of operators when mowing, mowers capable of walking by themselves are on the market. In some existing mowers with self-propelled functions, the self-propelled functions need to be manually controlled and only output a constant speed, so that a user can only follow the mower and perform mowing operation. In some mowers capable of adapting to the walking speed of users, the self-walking system is complex in structure, more in parts and easy to malfunction or lower in detection precision after long-term use.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide the backward-walking type self-pushing working machine with high reliability and simple structure.

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

a walk-behind self-propelled working machine comprising: the host machine comprises a walking assembly and a motor for driving the walking assembly; 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 host; the shell is provided with a first accommodating cavity, and the first connecting rod stretches into the first accommodating cavity; the sensing device is used for sensing the thrust applied to the handle device to drive the back-running self-propelled working machine; the trigger assembly can apply acting force to the sensing device when the holding part is pushed to drive the sensing device to deform; wherein, trigger the subassembly and be connected to the connecting rod subassembly, sensing device is connected to the operating element.

In one embodiment, the sensing device comprises a pressure sensor, and the trigger assembly applies a force to the pressure sensor to drive the pressure sensor to deform when the grip is pushed.

In one embodiment, the operating member is formed with a second receiving cavity, and the pressure sensor is at least partially disposed within the second receiving cavity.

In one embodiment, the operating member is disposed outside the housing.

In one embodiment, the pressure sensor is disposed outside the housing.

In one embodiment, the trigger assembly comprises: a trigger for applying a force to the pressure sensor; the sliding piece is connected with the first connecting rod; the handle device further comprises a supporting piece used for supporting the sliding piece, the sliding piece is in contact with the trigger piece, the supporting piece is fixedly connected with the operating piece, and the sliding piece penetrates through the supporting piece.

In one embodiment, when the operating member is pushed, a relative movement can be generated between the support member and the sliding member, wherein the relative movement generated by the support member relative to the sliding member is less than or equal to 3 mm.

In one embodiment, the support is disposed within the housing.

In one embodiment, the trigger includes a ball portion in contact with the pressure sensor.

In one embodiment, the trigger is a ball.

In one embodiment, the sensing device comprises a pressure sensor, and the handle device further comprises: a pretension element for biasing the trigger assembly to apply a pretension force to the pressure sensor.

In one embodiment, the connecting rod assembly further comprises a second connecting rod connected to the host, and the housing connects the first connecting rod and the second connecting rod.

A walk-behind self-propelled working machine comprising: the host machine comprises a walking assembly and a motor for driving the walking assembly; a handle device connected to the host; the handle device includes: an operation member including a grip portion for operation by a user; a connecting rod assembly including a connecting rod connected to the host; the shell is provided with a first accommodating cavity, and the connecting rod extends into the first accommodating cavity; the sensing device is used for sensing the thrust applied to the handle device to drive the back-running self-propelled working machine; the trigger assembly can apply acting force to the sensing device when the holding part is pushed to drive the sensing device to deform; wherein the sensing device is arranged outside the shell.

A walk-behind self-propelled working machine comprising: the host machine comprises a walking assembly and a motor for driving the walking assembly; a handle device connected to the host; the handle device includes: an operation member including a grip portion for operation by a user; a connecting rod assembly including a connecting rod connected to the host; the shell is provided with a first accommodating cavity, and the connecting rod extends into the first accommodating cavity; the sensing device is used for sensing the thrust applied to the handle device to drive the back-running self-propelled working machine; the trigger assembly can apply acting force to the sensing device when the holding part receives pushing force; wherein the sensing device is arranged outside the shell.

A walk-behind self-propelled working machine comprising: the host machine comprises a walking assembly and a motor for driving the walking assembly; a handle device connected to the host; the handle device includes: an operation member including a grip portion for operation by a user and a mounting portion provided at an end portion of the grip portion; the connecting rod assembly comprises a connecting rod for connecting the mounting part and the host; the sensing device is used for sensing the thrust applied to the handle device to drive the back-running self-propelled working machine; the trigger assembly can apply acting force to the sensing device when the holding part is pushed to drive the sensing device to deform; wherein, the installation department is formed with and holds the chamber, and sensing device sets up in holding the intracavity, and one of sensing device and trigger assembly is installed to the installation department, and another is installed to the connecting rod subassembly.

The invention has the advantages that: the backward walking type self-pushing working machine is simple in structure 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 assembly 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 partial region in 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 assembly of FIG. 3 with the operating member separated;

fig. 8 is an enlarged view of a portion of the area in 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 in fig. 9;

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

FIG. 12 is a cross-sectional view of the pressure sensor and trigger 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 as the pressure sensor is deformed;

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

FIG. 14b is a plan view of another embodiment 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 assembly in a mower of another embodiment;

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

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

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

fig. 19 is an enlarged view of a partial region in fig. 17;

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

Description of the embodiments

The invention is described in detail below with reference to the drawings and the specific embodiments.

The walk-behind self-propelled working machine shown in fig. 1 is specifically a lawn mower 300 for cutting lawns. In other embodiments, the walk-behind self-propelled working machine may be a snowplow or another self-propelled working machine such as a dolly.

As shown in fig. 1, the mower 300 includes: host 301 and handle device 30. Host 301 includes: a blade assembly 302, a chassis 303, a walking assembly 304, and a motor 305. The blade assembly 302 is used for performing a cutting function, the chassis 303 is used for accommodating the blade assembly 302, the walking assembly 304 supports the chassis 303, the motor 305 is used for driving the blade assembly 302 to rotate, and the motor 305 can also drive the walking assembly 304 to rotate.

Handle device 30 is connected to host 301, and handle device 30 is connected to the back end of host 301. The handle means 30 is for operation by a user. The handle device 30 can also be rotated relative to the main machine 301 to accommodate users having different heights. The handle device 30 can also be rotated to a folded state relative to the main machine 301, and the mower 300 occupies a small space, so that the 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 trigger assembly 35 and the pretensioning element 36, wherein the sensing device 34a comprises a pressure sensor 34. The operating member 31 includes a grip portion 311, a first mounting portion 312 and a second mounting portion 313, the grip portion 311 being for a user to grip, the first mounting portion 312 and the second mounting portion 313 being provided at both ends of the grip portion 311, respectively. 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 a user needs to push the mower 300 to mow, the user can stand on the rear side of the handle device 30 and hold the holding portion 311 with his hand to apply forward pushing force to the holding portion 311, so that the mower 300 can be driven to walk on the ground.

The connecting rod assembly 32 is used to connect the operating member 31 and the host 301. The connection rod assembly 32 includes a first connection rod 321 and a second connection rod 322, one end of the first connection rod 321 is connected to the host 301, and the other end is connected to the first mounting portion 312. One end of the second connection rod 322 is connected to the host 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. Handle set 30 further includes a trigger 390 for actuating blade assembly 302, trigger 390 being rotatably coupled to housing 33. The housing 33 is formed with a first receiving chamber 331, and the first connecting rod 321 extends into the first receiving chamber 331 along a first straight line 300 a. The housing 33 is also fixedly connected to the connecting rod assembly 32.

The pressure sensor 34 is used to sense the thrust applied to the handle device 30 to drive the mower 300 forward. In this embodiment, the pressure sensor 34 is a resistive strain gauge sensor. In other embodiments, the pressure sensor may also be a piezoelectric thin film sensor, or the pressure sensor may also be a ceramic sensor. The trigger assembly 35 can apply a force to the pressure sensor 34 when the grip portion 311 receives a pushing force, and the trigger assembly 35 can drive the pressure sensor 34 to deform. Thus, when a user applies a pushing force to the grip portion 311, the trigger assembly 35 applies a force to the pressure sensor 34, and the pressure sensor 34 deforms and generates an electrical signal. Mower 300 may further comprise a signal processing device to which the electrical signal generated by pressure sensor 34 is sent and a controller to which the signal processing device sends the processed signal, which in turn controls mower 300 to walk on the ground and causes mower 300 to accelerate as the thrust exerted by the user increases and mower 300 to decelerate as the thrust exerted by the user decreases. When the user walks up, the pushing force applied to the handle device 30 by the user increases, and the controller also controls the advancing speed of the mower 300 to increase. Similarly, as the user walks at a reduced speed, the user's pushing force applied to the handle assembly 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 applied to the grip portion 311 in the direction of the first straight line 300a to the deformation amount of the pressure sensor 34 in the direction of the first straight line 300a is 40N/mm or more and 1200N/mm or less. Alternatively, in other embodiments, the ratio of the component force of the pushing force applied to the grip portion 311 along the first straight line 300a to the deformation amount of the pressure sensor 34 along the first straight line 300a is 1200N/mm or more and 5000N/mm or less.

In this embodiment, the pressure sensor 34 is connected to the operating member 31, and the trigger assembly 35 is connected to the connecting rod assembly 32. Thus, the pressure sensor 34 and the operating member 31 form a first integral body that moves together, and the trigger assembly 35 and the connecting rod assembly 32 form a second integral body that moves together. In this way, the trigger assembly 35 follows the position of the connecting rod assembly 32 in the direction of the first straight line 300a, while the pressure sensor 34 moves 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 deform or shake during operation, for example, the positions of the first mounting portion 312 and the second mounting portion 313 change, 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 apply a force to the pressure sensor 34 relatively stably, thereby improving the detection precision of the pressure sensor 34 and also ensuring that the mower 300 is still 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 configured to contact the pressure sensor 34 to apply a force to the pressure sensor 34. The slider 352 is used to connect the trigger 351 to the first connecting rod 321, in this embodiment the slider 352 and the trigger 351 are two distinct parts. In other embodiments, the slider 352 may also be integrally formed with the trigger 351. In the present embodiment, the slider 352 is connected to the connecting rod assembly 32 by a connecting pin 391, which extends in a direction perpendicular to the first straight line 300 a.

The operating member 31 is formed with a second receiving cavity 314, and the second receiving cavity 314 is formed at an end of the first mounting portion 312 remote from the grip portion 311. The second receiving cavity 314 is open to the connecting rod assembly 32, and the pressure sensor 34 is disposed within the second receiving cavity 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 trigger assembly 35 is mounted to the link assembly 32, and in particular, a slider 352 in the trigger assembly 35 is fixedly connected to the first link 321, and the position of the slider 352 and the trigger 351 in the direction of the first straight line 300a is kept in synchronization. The pressure sensor 34 is disposed outside the housing 33, thus facilitating assembly of the pressure sensor 34. When the pressure sensor 34 is severely deformed after a long-term use or the pressure sensor 34 detects a failure, the user can more conveniently replace the pressure sensor 34. In other embodiments, the pressure sensor may also be 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 trigger 351 is at least partially disposed within the second receiving cavity 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 trigger 351 is a ball, the trigger 351a is a sphere, and the trigger 351b is a sphere. 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 be in contact with 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 trigger 351 is in contact with the pressure sensor 34 but no force is applied to the pressure sensor 34 or the force F is applied less, the position of the through hole 341 is substantially unchanged, and the trigger face 351b is in contact with the edge of the through hole 341 and uniformly applies the force F to a circle of the edge, so that the force F applied by the trigger 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 is deformed and the position of the through hole 341 is changed, but the through hole 341 is still symmetrical about a 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 of the trigger 351 contacts the through hole 341, so that the force F received by the pressure sensor 34 extends substantially along the first straight line 300a, thereby increasing the accuracy of detection. The spherical portion is a part of one ball. The ball portion may be part of a standard ball or may be part of a sphere-like shape, for example, a duck egg-like shape. That is, the shape of the spherical portion is not strictly required to be a part of a standard sphere, and all the solutions which basically achieve the above-described technical effect of improving the accuracy of detection of the present invention fall within the scope of the present invention.

In the present embodiment, the projected area of the trigger surface 351b in the plane perpendicular to the first straight line 300a is larger than the projected area of the through hole 341 in the plane. In this way, even when the pressure sensor 34 is deformed, the ball rotates, and the trigger surface 351b always contacts the through hole 341 through 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 remains 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 operation member 31, and the triggering member 351 is disposed between the pressure sensor 34 and the connection rod assembly 32, and the position of the triggering member 351 with respect to the connection rod assembly 32 in the direction along the first straight line 300a is maintained to be fixed, so that detection errors due to the positional movement of the ball can be further reduced. In other embodiments, the pressure sensor may also be coupled to the connecting rod assembly, and the trigger member coupled to the operating member, the trigger member being a ball disposed between the operating member and the pressure sensor, while the position of the pressure sensor relative to the connecting rod assembly in the first linear direction remains fixed.

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

In other embodiments, the trigger may not be in the shape of a ball. For example, in the embodiments shown in fig. 14a, 14b, and 14c, the trigger 451 includes a main body portion 451c and a spherical portion 451a for contacting the pressure sensor, the spherical portion 451a is a portion of a sphere, and the trigger surface 451b formed by the spherical portion 451a for contacting the pressure sensor is a hemispherical surface. Likewise, it will be appreciated that in other embodiments, the ball 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 end of the slider is formed with a ball portion 451 a.

In the embodiment shown in fig. 14a, the trigger surface 451b is a hemispherical surface. In other embodiments, the ratio of the area of the trigger face to the sphere 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 a trigger surface 453a of the trigger 453, the triggered surface 452a being a part of a spherical surface, and the trigger surface 453a may be a planar surface. In this embodiment, the triggered surface 452a is a wall of a hole, and the wall of the hole is a part of a sphere.

Alternatively, as shown in the embodiment of fig. 14c, the triggered surface 454a formed by the pressure sensor 454 is a surface of an upwardly convex spherical portion, the surface of the spherical portion is a part of a spherical surface, and the triggering surface 455a of the triggering member 455 may be a flat surface.

The pretension 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 initial deformation can be filtered out, thereby improving the accuracy of the processed signal of the signal processing device.

The handle device 30 further comprises a support 37, the support 37 being adapted to support a slider 352, the support 37 being arranged in a first receiving cavity 331 formed in the housing 33. The support 37 is also fixedly connected to the operating member 31. The support 37 may also be considered to be part of the first integral body, such that the support 37, the operating member 31 and the pressure sensor 34 constitute the first integral body described above. When the user applies a pushing force to the grip portion 311, the support 37, the operating member 31, and the pressure sensor 34 together generate a minute movement in the direction of the first straight line 300a with respect to the second whole. The distance of the movement generated by the first body relative to the second body is 3 mm or less, and the movement generated by the first body relative to the second body is used to provide a stroke for the trigger 351 to deform the pressure sensor 34. That is, the distance of movement of the first body along the first straight line 300a is the same as the stroke of the activation of the trigger 351 and the deformation of the pressure sensor 34. Thus, the movement of the operating member 31, the pressure sensor 34, and the support 37 relative to the connecting rod assembly 32 is very small, and the user does not substantially feel the movement of the operating member 31, the pressure sensor 34, and the support 37 relative to the connecting rod assembly 32. Alternatively, it is also contemplated that the operator 31, pressure sensor 34, and support 37 are not moved relative to the connecting rod assembly 32 by the user.

In the present embodiment, the operating 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 operation member 31 in order to fixedly connect them together to be a first integral body. The support 37 is formed with a support hole 371, and the slider 352 includes a slider portion 352a disposed inside the support hole 371 and a driving portion 352b in contact with the trigger 351. The pretensioning member 36 is disposed in a first accommodation chamber 331 formed in the housing 33, and the pretensioning member 36 biases the driving portion 352b. In the present embodiment, the pre-tightening element 36 is a spring, and further, the pre-tightening element 36 is a belleville spring that is sleeved on the sliding portion 352a and supports the driving portion 352b. In other embodiments, the pretensioning element 36 may also be a coil spring, and the pretensioning element 36 may also be a rubber member. The pretensioning element 36 indirectly biases the trigger 351 via the slider 352 so that the trigger 351 is always in contact with the pressure sensor 34.

When the operating member 31 receives the pushing force, the first body moves relative to the second body, the supporting member 37 moves relative to the sliding member 352 along the first straight line 300a, and the stroke of the relative movement is the same as that of the movement generated by the first body relative to the second body, and the maximum value of the relative movement generated by the supporting member 37 relative to the sliding member 352 is less than or equal to 3 mm. In this embodiment, in fact, the slider 352 is fixed relative to the host 301, and the support 37 moves with the operating member 31 relative to the host 301, so that a relative movement is generated between the support 37 and the slider 352. Because the movement is relative, the movement of support 37 relative to slider 352 may also be considered as the movement of slider 352 relative to support 37.

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

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

The coefficient of friction between the support 37 and the slider 352 is greater than 0 and less than or equal to 0.3, which allows for more accurate force transfer to the pressure sensor 34. 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 friction force between the support 37 and the slider 352 on the thrust force applied by the user, the friction coefficient 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 support 37 is a metal member, and the slider 352 is a plastic member. In other embodiments, the support member may be a plastic member and the slider may be a metal member. Alternatively, in one embodiment, the first material is a first metal and the second material is a second metal, that is, 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. Further, the surface roughness Ra of the support 37 is less than or equal to 3.2 nm, and the surface roughness Ra of the slider 352 is less than or equal to 3.2 nm. In this way, the friction between the support 37 and the slider 352 is made smaller when the support 37 and the slider 352 are moved relatively, so that the measurement of the thrust force detected by the pressure sensor 34 is more accurate. In other embodiments, the support and the slider may also be made of the same material, e.g., both the support and the slider are made of plastic. In this case, in order to reduce friction factors between the support and the slider, the surface of the support or the slider may be plated with a metal layer, for example, chrome plating, on the surface of the support or the slider, which may reduce surface roughness of the support and the slider. When the surface of the support or the slider is coated with the material layer, the surface roughness of the support or the slider 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 371a and a second hole wall 371b. The first hole wall 371a and the second hole wall 371b are located at different positions in the direction along the first straight line 300 a. The first hole wall 371a has a first inner diameter and the second hole wall 371b has a second inner diameter, the first inner diameter being larger than the second inner diameter. That is, the first hole wall portion 371a and the second hole wall portion 371b are respectively cylindrical holes having different inner diameters. The sliding member 352 is formed with a stepped structure 352c, so that the sliding member 352 can be in contact with both the first hole wall portion 371a and the second hole wall portion 371b, and thus, the contact area of the sliding member 352 and the supporting member 37 can be reduced, thereby further reducing the influence of the sliding member 352 and the supporting member 37 on the acting force during 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 mower, which may also be another walk-behind self-propelled working machine having a handle device 50. As shown in fig. 15 to 20, the mower may have the same main body as the mower 300, and the handle device 50 has the same operating member 51, the connecting lever assembly 52, the sensing device 54a, the trigger assembly 55 and the pretensioning element as the handle device 50. The differences are mainly that: the housing 33 in the mower 300 is fixedly connected with the connecting rod assembly 32, and the housing 53 in the mower is fixedly connected with the operating member 51. The structure of the mower 300 applicable 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 the extending direction thereof are defined as a first end 511a and a second end 511b, respectively. The operating member 51 further comprises a first mounting portion 512 and a second mounting portion 513, the first mounting portion 512 comprising a first mounting end 512a for mounting the sensing device 54a or the triggering member 551, the second mounting portion 513 comprising a second mounting end 513a for mounting the sensing device 54a or the triggering member 551. The sensing device 54a includes a pressure sensor 54 for sensing a pushing force applied to the handle device 50 to drive the mower, and the trigger 551 can apply a force to the pressure sensor 54 to drive the pressure sensor 54 to deform when the grip 511 receives the pushing force. The first mounting portion 512 is provided at a first end 511a of the grip portion 511, and the second mounting portion 513 is provided 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 two pressure sensors 54 are respectively disposed in the first mounting cavity 512b and the second mounting cavity. The trigger 551 can apply a force to the pressure sensor 54 in the direction of the first straight line 500 a.

The handle device 50 further comprises 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 slide 552, the slide 552 being fixedly coupled to the connecting rod assembly 52. The support 57 is also formed with a support hole 571, and the slider 552 passes through the support hole 571 to be in contact with the trigger 551. When a user applies a force to the grip 511, the first body constituted by the operating piece 51, the supporting piece 57, and the pressure sensor 54 is slightly displaced relative to the second body constituted by the trigger piece 551, the slider 552, and the link assembly 52, and the trigger piece 551 deforms the pressure sensor 54 by the slight displacement, so that the pressure sensor 54 outputs a signal. The minute displacement is the same as the deformation amount generated by 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 thus, the housing 53 may also be referred to as a connecting member for fixedly connecting the first mounting end 512a and the second mounting end 513a. For convenience of explanation, the technical solution of the present invention will be described below by replacing the connector with the housing 53, and in fact, the housing 53 is the connector. The extending direction of the first mounting portion 512 is the same as the extending direction of the first connecting rod 521, and the extending direction of the second mounting portion 513 is the same as the extending direction of the second connecting rod 522. The first mounting portion 512 extends along the first straight line 500a, and the second mounting portion 513 extends in a direction parallel to the first straight line 500 a. The grip 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 can ensure that the distance L1 between the first mounting end 512a and the second mounting end 513a remains substantially unchanged. In one aspect, trigger 551 is capable of applying a force to pressure sensor 54 in a direction substantially along first line 500 a. On the other hand, the housing 53 can avoid an increase in friction between the support 57 and the slider 552 due to a change in the distance L1 between the first mounting end 512a and the second mounting end 513a, thereby reducing the influence of friction between the support 57 and the slider 552 on the force. The housing 53 is fixedly connected to 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 is not limited to the housing 53 being directly connected to the first mounting end 512a or the second mounting end 513a, and the housing 53 may indirectly fix the first mounting end 512a and the second mounting end 513a through other parts. For example, in the present embodiment, a part of the housing 53 is disposed between the first connecting rod 521 and the second connecting rod 522, both ends of the housing 53 are fixedly connected to the two supporting members 57, respectively, and the two supporting members 57 are fixedly connected to the first mounting portion 512 and the second mounting portion 513, respectively, 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 grip portion 511, and the other end is the first mounting end 512a, where the first mounting end 512a is far from the first end 511a. One end of the second mounting portion 513 is connected to the second end 511b of the grip portion 511, and the other end is a second mounting end 513a, where the second mounting end 513a is far from the second end 511b.

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 supporting member 57 is at least partially disposed in the first accommodating chamber 531, the housing 53 is fixedly connected with the supporting member 57, and the supporting member 57 is fixedly connected with the operating member 51 and the pressure sensor 54. The pressure sensor 54 is disposed outside the first accommodation chamber 531, and the pressure sensor 54 is disposed in the first and second installation chambers 512b and 512 b.

The housing 53 specifically includes: the first housing portion 53a and the second housing portion 53b, the first housing portion 53a and the second housing portion 53b can be separated from each other, and the first housing portion 53a and the second housing portion 53b can be butted together as a whole. When the first and second housing portions 53a and 53b are butted, the first and second housing portions 53a and 53b surround the first accommodation chamber 531 into which the connection rod assembly 52 is inserted. In other embodiments, the operation member 51 may be inserted into the first accommodation chamber 531. The handle device 50 further comprises a mounting member 58, the mounting member 58 being adapted to fixedly connect the housing 53 with the support member 57. In the present embodiment, the supporting member 57 includes a protruding portion 572 protruding outside the housing 53, and the mounting member 58 includes a screw passing through the first housing portion 53a, the protruding portion 572, and the second housing portion 53b in order, thereby fixedly connecting the housing 53 with the supporting member 57.

In the direction along the first straight line 500a, a distance L2 between the grip 511 and the housing 53 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 511 is made sufficiently large, so that the distance between the first mounting portion 512 and the second mounting portion 513 can be better ensured.

When the first mounting end 512a and the second mounting end 513a are not fixedly connected through the housing 53, the distance L1 between the first mounting end 512a and the second mounting end 513a may be changed due to the difference in the direction of the pushing force applied by the user, or the distance L1 between the first mounting end 512a and the second mounting end 513a may be changed due to the deformation of the operating member 51 caused by long-term operation, or the distance L1 between the first mounting end 512a and the second mounting end 513a may be changed due to the collision of the operating member 51 with other objects, which may cause the measured value of the pushing force detected by the pressure sensor 54 to be different from the actual value of the pushing force applied by the user to the grip 511, thereby affecting the speed of the controller controlling the motor to be not compatible with the walking speed of the user or the pushing force applied by the user. For example, when the housing 53 is not connected 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 may vary between 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 operation member 51, thereby improving the accuracy of the detection by the pressure sensor 54.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.

Claims

1. A walk-behind self-propelled working machine comprising:

the host machine comprises a walking assembly and a motor for driving the walking assembly;

a handle device connected to the host;

the handle device comprises:

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

a connecting rod assembly including a first connecting rod connected to the host;

the shell is provided with a first accommodating cavity, and the first connecting rod extends into the first accommodating cavity;

a sensing device for sensing a thrust applied to the handle device to drive the walk-behind self-propelled working machine, the sensing device being disposed outside the housing;

a trigger assembly capable of applying a force to the sensing device when the grip portion is pushed;

wherein the trigger assembly is connected to the connecting rod assembly and the sensing device is connected to the operating member.

2. The walk-behind self propelled working machine of claim 1 wherein: the sensing device comprises a pressure sensor, and when the holding part is pushed, the trigger component applies acting force to the pressure sensor to drive the pressure sensor to deform.

3. The walk-behind self propelled working machine of claim 2 wherein: the operating member is formed with a second receiving cavity in which the pressure sensor is at least partially disposed.

4. The walk-behind self propelled working machine of claim 2 wherein: the operating piece is arranged outside the shell.

5. The walk-behind self propelled working machine of claim 2 wherein: the pressure sensor is disposed outside the housing.

6. The walk-behind self propelled working machine of claim 2 wherein: the trigger assembly includes:

a trigger for applying a force to the pressure sensor;

the sliding piece is connected with the first connecting rod;

the handle device further comprises a supporting piece used for supporting the sliding piece, the sliding piece is in contact with the trigger piece, the supporting piece is fixedly connected with the operating piece, and the sliding piece penetrates through the supporting piece.

7. The walk-behind self propelled working machine of claim 6 wherein: when the operating piece receives thrust, the support piece and the sliding piece can generate relative movement which enables the pressure sensor to deform, and the maximum value of the relative movement generated by the support piece relative to the sliding piece is less than or equal to 3 millimeters.

8. The walk-behind self propelled working machine of claim 6 wherein: the support is disposed within the housing.

9. The walk-behind self propelled working machine of claim 6 wherein: the trigger includes a ball portion in contact with the pressure sensor.

10. The walk-behind self propelled working machine of claim 9 wherein: the trigger is a ball.

11. The walk-behind self propelled working machine of claim 1 wherein: the sensing device includes a pressure sensor, and the handle device further includes:

a pretension element for biasing the trigger assembly to apply a pretension force to the pressure sensor.

12. The walk-behind self propelled working machine of claim 1 wherein: the connecting rod assembly further comprises a second connecting rod connected to the host, and the shell is connected with the first connecting rod and the second connecting rod.

13. A walk-behind self-propelled working machine comprising:

a handle device connected to the host;

the handle device comprises:

an operation member including a grip portion for operation by a user;

a connecting rod assembly including a connecting rod connected to the host;

the shell is provided with a first accommodating cavity, and the connecting rod extends into the first accommodating cavity;

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

wherein the sensing device is arranged outside the shell.

14. A walk-behind self-propelled working machine comprising:

a handle device connected to the host;

the handle device comprises:

an operation member including a grip portion for operation by a user and a mounting portion provided at an end portion of the grip portion;

a connecting rod assembly including a connecting rod connecting the mounting portion and the host;

the installation part is arranged outside the shell, the installation part is provided with a containing cavity, the sensing device is arranged in the containing cavity, and one of the sensing device and the triggering component is installed on the installation part, and the other is installed on the connecting rod component.