JP2023081144A - work machine - Google Patents

Abstract

To provide a work machine equipped with a handle that has a high rigidity in both right and left directions.SOLUTION: A work machine 1 in this invention comprises a machine body 3, work parts 6 and 7 arranged at the front part of the machine body 3, a pair of travel parts 4 arranged on the right and left of the machine body 3, and a handle 5 arranged at the rear part of the machine body 3. The machine body 3 comprises a pair of side members 37 that extend in the longitudinal direction supporting the travel parts 4, and a rear member 38 that extends in the transverse direction connecting the rear parts of the side members 37 with each other. The handle 5 comprises right and left side bars 20a that vertically extend above the rear member 38, and cross members 21 and 64 that extend in the transverse direction between both the side bars 20a. Both the side bars 20a and the rear member 38 are connected with each other with a pair of brackets 45 each of which includes right and left sidewalls 43 arranged on both sides of each of the side bars and a cross wall 44 connecting either the forward edges with each other or the rear edges with each other of both the sidewalls 43.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a work machine, and more particularly to a walk-behind work machine including a handle provided on the rear part of the machine body.

2. Description of the Related Art Conventionally, a work machine (snow remover) is known that includes a body, a running section for running the body, and a work section for performing snow removal work (for example, Patent Document 1).

The snow remover described in Patent Document 1 further includes a pair of track frame portions that extend in the front-rear direction and support the traveling portion, and a connecting frame portion that connects the rear portions of both track frame portions. At the left and right ends of the connecting frame, a handle support frame having a substantially plate shape with a main surface facing left and right is projected upward, and an operation handle having a round pipe shape extends upward from the handle support frame. extended. A portion of the outer peripheral surface of the base portion of the steering handle is press-deformed to form a flat surface along the side surface of the handle support frame portion. This snow remover further includes a support frame that can swing up and down with respect to both track frame portions, a snow remover supported by the support frame, and an elevation drive mechanism that swings the support frame.

JP 2017-115312 A

However, in the work machine (snow remover) disclosed in Patent Document 1, the base of the steering handle is connected only to one side surface of the handle support frame. As a result, there is a problem that the rigidity of the steering handle is relatively low in one of the left and right directions.

SUMMARY OF THE INVENTION In view of the above background, an object of the present invention is to provide a working machine equipped with a handle having high rigidity in both left and right directions.

In order to solve the above problems, one aspect of the present invention is a work machine (1) comprising a machine body (3) and a working part (6, 7), a pair of running parts (4) provided on the left and right sides of the fuselage for running the fuselage, and a handle (5) provided on the rear of the fuselage. a pair of side members (37) extending in a direction and supporting the running portion; and a rear member (38) extending in a left-right direction and connecting rear portions of the side members to each other; Left and right side bars (20a) extending vertically above the rear member and cross members (21, 64) extending horizontally between the side bars, the side bars and the rear member , a pair of brackets (45) each comprising left and right side walls (43) arranged on both sides of each side bar and vertical walls (44) connecting the front edges or the rear edges of said side walls to each other. to provide a work machine (1) that is coupled to each other via a

According to this aspect, since the side walls of the bracket are arranged on both sides of the side bar, it is possible to provide a work machine equipped with a handle device having high rigidity in both left and right directions.

In the above aspect, the side bar may have a hollow tubular shape and be welded to the bracket.

According to this aspect, since the bending rigidity of the side bar does not weaken in a specific direction in the cross section (the moment of inertia of area does not decrease), the rigidity of the handle device is increased in the longitudinal direction and the lateral direction.

In the above aspect, the bracket includes body portions (43, 44) coupled to the upper surface of the rear member and extension portions (48) extending downward from the body portion and coupled to the rear surface of the rear member. and

According to this aspect, the coupling length of the bracket to the rear member can be increased, so the coupling strength of the bracket is improved. In addition, since the bracket is coupled to the mutually crossing upper and rear surfaces of the rear member, the coupling strength of the bracket against upward and forward forces is increased.

In the above aspect in which the bracket has an extension, it is preferable that the extension is provided only on one of the two side walls of the bracket, which is arranged on the outer left and right sides.

According to this aspect, the walking of the worker positioned behind the machine body is less likely to be hindered by the extension.

In the above aspect, each of the running parts includes a driving wheel (15) arranged on the front side and a driven wheel (16) arranged on the rear side supported by the corresponding side member, A member receives an axle (16a) of the driven wheel and has a longitudinally elongated hole (50) and a bolt (50) connected to the axle of the driven wheel and extending rearward through the rear member. 52), and a position adjusting nut (53) screwed onto the bolt to adjust the longitudinal position of the bolt, and the bracket is coupled to the upper surface of the rear member (43, 44). ) and an extension portion (48) extending downward from the main body portion and coupled to the rear surface of the rear member, the extension portion being provided on only one of the side walls of the bracket, and the extension portion is preferably located below the position adjusting nut.

According to this aspect, the coupling length of the bracket to the rear member can be increased, so the coupling strength of the bracket is improved. In addition, since the bracket is coupled to the mutually crossing upper and rear surfaces of the rear member, the coupling strength of the bracket against upward and forward forces is increased. Further, even if the extension portion is provided, it is easy to adjust the longitudinal position of the driven wheel via the position adjusting nut.

In the above embodiment in which the bracket has extensions, said extensions may have the same thickness as the corresponding sidewall.

According to this aspect, compared with the case where the extension is thicker than the side wall, the extension is less likely to hinder walking of the worker positioned at the rear of the machine body.

In the above aspect, it is preferable that each side member and the rear member are fastened by a plurality of fastening members (54) arranged on left and right inner sides and left and right outer sides of the side walls, respectively.

According to this aspect, since the bracket is coupled to a portion of the fuselage that has high rigidity due to the fastening of the side members and the rear member to each other, the rigidity of the handle device is increased.

In the above aspect, the side member has an outer wall (37a) extending in the vertical direction and an upper wall (37b) extending leftward and rightward from the upper end of the outer wall. It is preferable that the wall has a widened portion (41) that widens inward in the left and right direction toward the rear end, and that each side member and the rear member are joined at positions vertically corresponding to the widened portion.

According to this aspect, the length in the left-right direction of the upper wall of the side member can be shortened in the portion other than the widened portion. This improves the flexibility of the layout of the working section.

In the above aspect, the sidebars may have lower ends extending along the vertical walls of the corresponding brackets.

According to this aspect, the bonding strength of the side bar to the bracket is increased in the front-rear direction.

A working machine having a handle with high rigidity in both left and right directions is provided.

Side view of the snow remover according to the first embodiment FIG. 2 is a perspective view of the snow remover according to the first embodiment viewed from the left and forward. FIG. 2 is an enlarged side view of a main part of the snow remover according to the first embodiment; FIG. 2 is a perspective view of the snow remover according to the first embodiment viewed from the rear to the left. Enlarged side view of essential parts of the snow remover according to the second embodiment

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is applied to a snow remover 1 in the following embodiments. Hereinafter, terms indicating directions such as front/rear, left/right, and up/down are used based on the direction viewed from the operator who operates the snow remover 1 . In the figure, the arrow indicated by "Fr" points forward.

FIG. 1 is a side view of the snow remover 1 according to the first embodiment. First, referring to FIG. 1, the overall configuration of the snow remover 1 will be described.

As shown in FIG. 1, the snow remover 1 is a walk-behind snow remover that removes snow while a worker walks behind it. The snow blower 1 includes a body 3 that constitutes its skeleton, a pair of traveling devices 4 provided on the left and right sides of the body 3, a handle device 5 provided at the rear of the body 3, and a handle device 5 provided at the front of the body 3. and an auger device 7 provided in front of the blower device 6 . In FIG. 1, only the travel device 4 provided on the left side of the body 3 is shown. Both traveling devices 4 are supported by a traveling frame 3 a ( FIG. 2 ) provided at the bottom of the body 3 .

The blower device 6 and the auger device 7 constitute a working part of the snow remover 1 for removing snow. The blower device 6 and auger device 7 are supported by working frames 3 b ( FIG. 2 ) provided at the front and top of the machine body 3 . The traveling frame 3a and the working frame 3b are rotatably connected to each other at the front. The work frame 3b is provided with a height adjustment mechanism 8 that adjusts the height of the auger device 7 by rotationally driving the work frame 3b with respect to the traveling frame 3a.

An internal combustion engine (hereinafter referred to as "engine 10") is supported as a drive source on the upper portion of the fuselage 3. As shown in FIG. The engine 10 has a crankshaft 11 (only the front end portion thereof is shown in FIG. 1) rotatable around an axis extending in the longitudinal direction. Note that in other embodiments, the crankshaft 11 may be rotatable around an axis extending in the vertical direction.

A transmission shaft 12 rotatable around an axis extending in the front-rear direction is provided in front of the lower part of the body 3 . The transmission shaft 12 is arranged at a position lower than the crankshaft 11 and connected to the crankshaft 11 via a speed reduction mechanism 13 . The reduction mechanism 13 has a small-diameter drive pulley 13a connected to the crankshaft 11, a large-diameter driven pulley 13b connected to the transmission shaft 12, a belt 13c wound around both pulleys, and a tensioner (not shown). .

Each traveling device 4 is an endless track having drive wheels 15 , driven wheels 16 provided behind the drive wheels 15 , and crawler belts 17 wound around the drive wheels 15 and the driven wheels 16 . Note that, in other embodiments, the driven wheels 16 may be provided in front of the drive wheels 15, and the travel device 4 may not be an endless track. Between both driven wheels 16, an axle 16a extending in the left and right direction is bridged. Both traveling devices 4 constitute a traveling section of the snow remover 1 for causing the machine body 3 to travel. The fuselage 3 is positioned between the traveling devices 4 . A drive motor 18 is connected as a drive source to the drive wheels 15 of each travel device 4 via a drive shaft 19 for transmitting drive force. At least one running motor 18 may be provided, but in this embodiment, two running motors 18 arranged on the left and right (only the left running motor 18 is shown in FIG. 1) are provided.

The handle device 5 includes left and right side bars 20a extending vertically (only the left side bar 20a is shown in FIG. 1), and a grip that extends rearward from the upper end of the side bar 20a to be gripped by the operator. 20c and an input device 21 extending left and right between the upper ends of both sidebars 20a. The input device 21 is fixed to the upper ends of the side bars 20a and connects the side bars 20a to each other. A battery box 64 (to be described later) is fixed to an intermediate portion of both side bars 20a in the vertical direction, and extends left and right between both side bars 20a. In this embodiment, the input device 21 and the battery box 64 constitute a cross member of the handle device 5 extending left and right between the two side bars 20a. The structure of the handle device 5 will be detailed later.

The input device 21 is a device that receives an input operation by an operator. The input device 21 includes, for example, a travel lever 22 that receives a travel operation of the snow remover 1 , a snow removal switch 23 that accepts an operation operation of the blower device 6 and the auger device 7 , and a height adjustment operation for the height adjustment mechanism 8 by the operator. It has a height adjustment switch 24 that accepts and a deadman's clutch 25 that is arranged close to the grip 20c.

The blower device 6 has a blower housing 26 fixed to the front portion of the fuselage 3 , a blower 27 housed in the blower housing 26 , and a shooter 28 extending upward from the upper end of the blower housing 26 . The blower 27 is fixed to the rear portion of the transmission shaft 12 .

The auger device 7 includes an auger housing 31 fixed to the front portion of the blower housing 26, an auger shaft 33 rotatably supported by the auger housing 31 and connected to the transmission shaft 12 via a transmission 32, and an auger shaft 33 and an auger claw 34 fixed to the .

Next, the travel device 4 according to the first embodiment will be described in detail with reference to FIGS. 2 to 4. FIG.

As shown in FIG. 2 , the travel device 4 is supported by a travel frame 3 a provided on the lower portion of the body 3 . The traveling frame 3a includes left and right side members 37 extending in the front-rear direction, and a rear member 38 extending in the left-right direction and connecting rear portions of the side members 37 to each other. The side members 37 support the corresponding driving wheels 15 and driven wheels 16 . Since the left and right side members 37 are arranged mirror-symmetrically and have substantially the same structure, only one side member 37 will be described below unless otherwise specified.

The side member 37 has an outer wall 37a extending in the vertical direction and an upper wall 37b extending inward from the upper end of the outer wall 37a. A lower wall 37c extends inward in the left and right direction from the lower end of the outer wall 37a. The upper wall 37b has a widened portion 41 that widens inward in the left and right direction toward the rear end. Similarly, the lower wall 37c also has a widened portion 41 that widens inward and leftward toward the rear end. The rear member 38 has a vertically extending vertical wall 38a, an upper wall 38b extending forward from the upper end of the vertical wall 38a, and a lower wall 38c extending forward from the lower end of the vertical wall 38a. have

The rear edge of the side member 37 is arranged between the upper wall 38b and the lower wall 38c of the rear member 38 in the vertical direction. Specifically, the rear end of the widened portion 41 of the upper wall 37b of the side member 37 abuts the lower surface of the upper wall 38b of the rear member 38, and the rear end of the widened portion 41 of the lower wall 37c of the side member 37 contacts the rear member. 38 is in contact with the upper surface of the lower wall 38c.

Each of the side members 37 and the rear member 38 is connected to the widened portion 41 at positions vertically corresponding to each other. Specifically, as shown in FIG. 4, the side member 37 and the rear member 38 are fastened to each other by fastening bolts 54 that are inserted through fastening holes (not shown) vertically penetrating each of them. The fastening bolts 54 detachably fasten the side member 37 and the rear member 38 to each other. The fastening bolts 54 are arranged in pairs with a predetermined interval in the left-right direction. In this embodiment, four pairs of fastening bolts 54 are provided near the left and right ends of each of the upper wall 38b and the lower wall 38c of the rear member 38. As shown in FIG.

As shown in FIG. 3, the outer wall 37a of the side member 37 is provided with a long hole 50 that receives the axle 16a of the driven wheel 16 and extends in the front-rear direction. The front end of the long hole 50 is positioned forward of the front end of the rear member 38 (upper wall 38b and lower wall 38c), and the rear end of the long hole 50 is positioned rearward of the front end of the rear member 38 (upper wall 38b and lower wall 38c). are placed. A bolt 52 extending rearward through the rear member 38 (vertical wall 38a) is coupled to the axle 16a. As shown in FIG. 4 , the bolts 52 are positioned between corresponding pairs of fastening bolts 54 in the left-right direction.

A position adjusting nut 53 for adjusting the longitudinal position of the bolt 52 is screwed onto the bolt 52 . The position adjusting nut 53 is provided behind the vertical wall 38 a of the rear member 38 . The position adjusting nut 53 abuts against the rear surface of the vertical wall 38a, restricting the longitudinal movement of the position adjusting nut 53, thereby fixing the longitudinal position of the axle 16a.

As shown in FIG. 3 , on the left and right outer surfaces of the outer wall 37 a of the side member 37 , there are crawler rollers that support the lower portion of the crawler belt 17 between the drive wheel 15 and the driven wheel 16 from the inside. A support 40 is provided. The crawler support portion 40 includes a substantially plate-shaped first portion 40a extending longitudinally and vertically along the outer wall 37a of the side member 37 between the driving wheel 15 and the driven wheel 16. . From the lower edge of the first portion 40a, the second portion 40b extends downward to the left and right. A substantially cylindrical third portion 40c extends forward and backward from the outer edge of the second portion 40b. The third portion 40c has a sled shape and supports the crawler belt 17 from the inside.

A substantially L-shaped support bracket 39 for the height adjustment mechanism 8 is coupled to the rear surface and the upper surface of the rear member 38 . In this embodiment, the support bracket 39 is welded to the rear surface and upper surface of the rear member 38 . The support bracket 39 has a substantially plate-like shape with main surfaces facing left and right. Two support brackets 39 are arranged at substantially the center of the rear member 38 in the left-right direction with a predetermined distance therebetween in the left-right direction.

Next, the handle device 5 according to the first embodiment will be described in detail with reference to FIGS. 1 to 4. FIG.

As shown in FIG. 1, the left and right sidebars 20a include left and right sidebar lower portions 60 (only the left sidebar lower portion 60 is shown in FIG. 1) that extend substantially vertically above the rear member 38, and corresponding sidebar lower portions. 60 and a sidebar top portion 61 (only the left sidebar top portion 61 is shown in FIG. 1). The side bar lower portion 60 has a hollow cylindrical shape. Therefore, the geometrical moment of inertia of the side bar lower portion 60 does not decrease in a specific direction on the cross section, and is generally uniform in any direction. Since the left and right side bar lower portions 60 and side bar upper portions 61 have substantially the same structure and are arranged in mirror symmetry, in the following, unless otherwise specified, one side bar lower portion 60 and side bar upper portion 61 only will be described.

As shown in FIG. 2, the side bar lower portion 60 includes a first portion 60a that slopes upward toward the rear, continues to the upper end of the first portion 60a via a bent portion, and extends upward to the left and right. It has an inclined second portion 60b and a third portion 60c that is continuous with the upper end of the second portion 60b via a bent portion and extends substantially parallel to the first portion 60a. As shown in FIG. 3, the lower end of the first portion 60a is arranged at a position substantially coinciding with the vertical wall 38a of the rear member 38 in the front-rear direction.

As shown in FIG. 2, the lower ends of the side bar upper portions 61 are provided on the left and right outer sides of the third portion 60c. The lower end of the side bar upper portion 61 has an arc-shaped cross section along the outer peripheral surface of the third portion 60c. In addition, as shown in FIG. 1, a battery box 64 fixed to the third portion 60c is arranged on the inner left and right sides of the third portion 60c. The battery box 64 accommodates a battery (not shown) that stores power generated by a generator (not shown) driven by the engine 10, and an ECU that controls the supply of the power stored in the battery to electrical equipment. ing.

Both side bar upper portions 61, both third portions 60c, and battery box 64 are detachably fastened to each other by fastening bolts 63 that are inserted through fastening holes 62 that penetrate left and right. Three fastening holes 62 are provided in the upper parts 61 of both side bars, and three fastening holes 62 are provided in the third part 60c and the battery box 64, respectively. there is In this embodiment, both side bar upper portions 61, both third portions 60c, and battery boxes 64 are connected by two right and left fastening bolts 63 passing through two fastening holes 62 arranged on the upper side of the side bar upper portions 61. are fastened to each other. By changing the position of the fastening hole 62 through which the fastening bolt 63 is inserted, the height of the side bar upper portion 61 with respect to the side bar lower portion 60 can be adjusted. The battery box 64 is fixed at a predetermined position on the sidebar lower portion 60, and the height of the battery box 64 does not change even if the height of the sidebar upper portion 61 is adjusted. Therefore, the position of the battery, which is a heavy object, is not changed, and the change in the position of the center of gravity of the fuselage 3 due to the height adjustment of the side bar upper portion 61 is small. Also, since the battery position does not change, there is no need to move the harness.

As shown in FIGS. 3 and 4, the side bar 20a and the rear member 38 include left and right side walls 43 arranged on both sides of the side bar 20a, and longitudinally connecting the front edges or the rear edges of the side walls 43 to each other. are connected to each other via brackets 45 each including a wall 44 . Specifically, the first portion 60 a of the side bar lower portion 60 and the upper wall 38 b of the rear member 38 are coupled to each other via the bracket 45 . The upper edge of the bracket 45 substantially coincides with the upper edge of the first portion 60a of the sidebar lower portion 60. As shown in FIG. In other embodiments, the vertical wall 44 may connect the trailing edges of the side walls 43 to each other. The fastening bolts 54 are arranged on the left and right inner sides and the left and right outer sides of the side walls 43 , respectively.

As shown in FIG. 4, the vertical wall 44 has a substantially U-shaped cross section with the center bulging forward. Also, as shown in FIG. 3 , the upper ends of the side walls 43 and the vertical walls 44 are in contact with the side bar lower portion 60 . A lower end of the vertical wall 44 is located forward of the side bar lower portion 60 . The rear edges of the side walls 43 are inclined downward toward the front. Sidebar lower portion 60 and bracket 45 are joined together by welding. In the first embodiment, the side bar lower portion 60 and the bracket 45 are welded to each other near the upper ends of the side walls 43 and vertical walls 44 and near the center of the side walls 43 in the vertical direction. A lower end of the side bar lower portion 60 is arranged at a position spaced upward from the upper wall 38 b of the rear member 38 .

The bracket 45 further has a body portion coupled to the upper surface of the upper wall 38b of the rear member 38 and an extension portion 48 extending downward from the body portion and coupled to the rear surface of the vertical wall 38a of the rear member 38 . In this embodiment, the side walls 43 and the vertical wall 44 constitute the main body. In addition, the extension part 48 is provided only on one of the left and right side walls 43 that is arranged on the outside of the right and left sides. In other embodiments, extensions 48 may be provided on both the left and right sidewalls 43 . It should be noted that in embodiments in which the vertical wall 44 connects the rear edges of the side walls 43 to each other, the vertical wall 44 may be provided with an extension 48 .

The extension portion 48 extends downward from the lower end of the side wall 43 along the rear surface of the vertical wall 38a of the rear member 38 . The trailing edge of the extension 48 slopes downward toward the front. The trailing edge of sidewall 43 and the trailing edge of extension 48 are smoothly connected to each other. The extensions 48 have the same thickness as the corresponding sidewalls 43 . The extension portion 48 is positioned laterally outward of the position adjusting nut 53 . The lower end of the extension portion 48 is positioned below the position adjusting nut 53 .

Next, the height adjustment mechanism 8 of the snow remover 1 according to this embodiment will be described in detail with reference to FIGS. 1 and 2. FIG. The height adjustment mechanism 8 is a mechanism for changing the height of the auger device 7 with respect to the travel device 4 .

As shown in FIG. 1, the height adjustment mechanism 8 is provided between an electric motor 70, a transmission shaft 71 driven by the electric motor 70, and between the travel frame 3a or the handle device 5 and the work frame 3b, and the transmission and a linkage 72 driven by the shaft 71 . In this embodiment, the height adjustment mechanism 8 includes a worm (not shown) attached to the output shaft of the electric motor 70, a worm wheel (not shown) that meshes with the worm, and a reduction mechanism connected to the worm wheel. and sector gears (not shown). The transmission shaft 71 is provided integrally with the sector gear. The transmission shaft 71 extends rightward from the center of the sector gear.

The link mechanism 72 of the height adjustment mechanism 8 includes a drive arm 74 coupled to the transmission shaft 71 and a drive link 75 having a free end of the drive arm 74 and an end pivoted to the support bracket 39 .

Thus, when the operator inputs a height adjustment operation in the upward or downward direction to the height adjustment switch 24 of the input device 21, the electric motor 70 of the height adjustment mechanism 8 rotates in the input direction. Rotation of the electric motor 70 is transmitted from the worm to the sector gear through the worm wheel and the reduction mechanism, and the sector gear and the transmission shaft 71 rotate integrally. By driving the link mechanism 72 coupled to the transmission shaft 71, the work frame 3b is rotationally driven around the drive shaft 19 with respect to the traveling frame 3a.

The snow blower 1 is configured as described above. Next, the effects of the snow remover 1 according to the present invention will be described. According to the structure of the present invention, since the side walls 43 of the bracket 45 are arranged on both sides of the side bar 20a (the first portion 60a of the side bar lower portion 60), the handle device has high rigidity in both left and right directions. A snow blower 1 with 5 is provided.

As shown in FIG. 4, the handle device 5 has a hollow cylindrical shape and is welded to the bracket 45. As shown in FIG. Specifically, the first portion 60 a of the side bar lower portion 60 is welded to the side wall 43 and vertical wall 44 of the bracket 45 . According to this configuration, the bending rigidity of the side bar lower portion 60 (the first portion 60a) does not weaken in a specific direction in its cross section (the moment of inertia of area does not decrease). Thereby, the rigidity of the handle device 5 is increased in the front-rear direction and the left-right direction.

As shown in FIG. 4 , the bracket 45 includes a body portion coupled to the top surface of the upper wall 38 b of the rear member 38 and an extension portion 48 extending downward from the body portion and coupled to the rear surface of the vertical wall 38 a of the rear member 38 . and According to this configuration, the coupling length of the bracket 45 to the rear member 38 can be increased, so that the coupling strength of the bracket 45 is improved. In addition, by connecting the bracket 45 to the mutually intersecting upper and rear surfaces of the rear member 38, the strength of the connection of the bracket 45 against upward and forward forces is enhanced.

As shown in FIG. 4 , the side member 37 and the rear member 38 are fastened by a plurality of fastening bolts 54 arranged on the left and right inner sides and left and right outer sides of the side walls 43 , respectively. According to this configuration, since the bracket 45 is coupled to a portion of the body 3 that has high rigidity due to the fastening of the side member 37 and the rear member 38 to each other, the rigidity of the handle device 5 is increased.

As shown in FIG. 4 , the extended portion 48 of the bracket 45 is provided only on one of the side walls 43 of the bracket 45 , which is arranged on the outer left and right sides. As a result, the walking of the worker positioned behind the machine body 3 is less likely to be hindered by the extension portion 48 . Also, the extensions 48 have the same thickness as the corresponding sidewalls 43 . Thereby, compared with the case where the extension part 48 is thicker than the side wall 43 , the extension part 48 is less likely to hinder walking of the worker positioned behind the machine body 3 .

As shown in FIGS. 3 and 4 , the extension 48 is provided on only one side wall 43 of the bracket 45 , and the lower end of the extension 48 is located below the position adjustment nut 53 . As a result, even when the extension portion 48 is provided, it is easy to adjust the position of the driven wheel 16 in the longitudinal direction via the position adjusting nut 53 .

The side member 37 has an outer wall 37a extending in the vertical direction and an upper wall 37b extending inward from the upper end of the outer wall 37a. The upper wall 37b has a widened portion 41 that widens inward and leftward toward the rear end, and the side members 37 and the rear member 38 are connected to the widened portion 41 at positions corresponding to the vertical direction. As a result, the length in the left-right direction of the upper wall 37b of the side member 37 can be shortened in the portion other than the widened portion 41, so that the degree of freedom in layout of the working portion is improved.

Next, the snow remover 100 according to the second embodiment will be described in detail with reference to FIG. Since the snow remover 100 differs from the snow remover 1 according to the first embodiment only in the bracket 45, description of other parts is omitted.

As shown in FIG. 5, the side bar 20a and the rear member 38 of the snow blower 100 include left and right side walls 102 arranged on both sides of the side bar 20a and vertical walls 103 connecting the front edges of the side walls 102 to each other. are coupled to each other via brackets 104 each including a . The bracket 104 further has a body portion coupled to the upper surface of the upper wall 38b of the rear member 38, and an extension portion 105 extending downward from the body portion and coupled to the rear surface of the vertical wall 38a of the rear member 38. Also in the second embodiment, the side wall 102 and the vertical wall 103 constitute the main body.

Sidebar 20a has a lower end that extends along vertical wall 103 of corresponding bracket 104 . That is, the front edge of the vertical wall 103 extends substantially parallel to the first portion 60a of the side bar lower portion 60. As shown in FIG. A lower edge of the first portion 60 a of the side bar lower portion 60 is positioned forward of the vertical wall 38 a of the rear member 38 .

In the second embodiment, the side bar lower portion 60 and the bracket 104 are welded to each other near the upper ends of the side walls 102 and vertical walls 103 and near the centers in the vertical direction. The trailing edge of sidewall 102 and the trailing edge of extension 105 are smoothly connected to each other. The rear edge of the side wall 43 and the rear edge of the extended portion 48 are substantially parallel to the vertical wall 38 a of the rear member 38 .

Sidebar 20a has a lower end that extends along vertical wall 103 of corresponding bracket 104 . Specifically, the first portion 60a of the sidebar lower portion 60 extends along the vertical wall 103 of the corresponding bracket 104. As shown in FIG. As a result, the coupling strength of the side bar 20a to the bracket 104 is increased in the front-rear direction.

Although the specific embodiments have been described above, the present invention is not limited to the above embodiments and can be widely modified. For example, in the above embodiment, the present invention is applied to the snow remover 1, but the present invention may be applied to work machines other than snow removers, such as cultivators, lawn mowers, and lawn mowers. Further, although the drive wheels 15 are arranged in the front portion of the travel device 4 in the above embodiment, they may be arranged in the rear portion of the travel device 4 . In the above embodiment, the rear edge of the side member 37 is arranged between the upper wall 38b and the lower wall 38c of the rear member 38 in the vertical direction. It may be arranged between the upper wall 37b and the lower wall 37c.

Also, in the above embodiment, the input device 21 and the battery box 64 constitute the cross member of the handle device 5, but in another embodiment, only one of the input device 21 and the battery box 64 is the handle device. 5 cross members may be configured. In the above embodiment, the cross member is a box-shaped body, but in another embodiment, the cross member may be a rod-shaped body, a cylindrical body having a hollow cylindrical shape, or a plate-shaped (that is, flat bar) or channel shape.

Moreover, although the height adjustment mechanism 8 includes the electric motor 70 in the above embodiment, the height adjustment mechanism 8 may be of a manual type without the electric motor 70 . Although the link mechanism 72 is coupled to the travel frame 3 a in the first embodiment, it may be coupled to the handle device 5 . The crawler support portion 40 provided at the intermediate portion in the longitudinal direction of the traveling device 4 does not have to be a fixed object, and may elastically support the crawler belt 17 from the inside, and supports the rotating body (intermediate wheel). You may support the crawler belt 17 via. In addition, the specific configuration, arrangement, quantity, angle, etc. of members and parts can be changed as appropriate within the scope of the present invention. On the other hand, not all of the components shown in the above embodiments are essential, and can be selected as appropriate.

Reference Signs List 1: snowplow 3: machine body 3a: traveling frame 3b: work frame 4: traveling device 5: handle device 8: height adjustment mechanism 15: driving wheel 16: driven wheel 16a: axle 19: driving shaft 20a: side bar 21: Input device 23 : snow removal switch 24 : height adjustment switch 37 : side member 37a : outer wall 37b : upper wall 37c : lower wall 38 : rear member 38a : vertical wall 38b : upper wall 38c : lower wall 41 : widened portion 43 : side wall 44 : Vertical wall 45 : Bracket 48 : Extension 50 : Long hole 52 : Bolt 53 : Position adjustment nut 64 : Battery box 100 : Snow blower 102 : Side wall 103 : Vertical wall 104 : Bracket 105 : Extension

Claims (9)

a working machine,
Airframe and
a working unit provided in the front part of the airframe for performing a predetermined work;
a pair of running parts provided on the left and right sides of the body for running the body;
a handle provided at the rear of the fuselage,
The aircraft is
a pair of side members extending in the front-rear direction and supporting the running portion;
a rear member extending in the left-right direction and connecting rear portions of the side members to each other;
the handle
left and right side bars extending vertically above the rear member;
a cross member extending laterally between the side bars;
The side bars and the rear member each comprise a pair of brackets each including left and right side walls disposed on both sides of each side bar and vertical walls connecting the front edges or the rear edges of the side walls to each other. working machines that are connected to each other via The working machine according to claim 1, wherein the side bar has a hollow cylindrical shape and is welded to the bracket. 3. The working machine according to claim 1, wherein the bracket has a main body portion coupled to the upper surface of the rear member, and an extension portion extending downward from the main body portion and coupled to the rear surface of the rear member. 4. The working machine according to claim 3, wherein the extension portion is provided only on one of the side walls of the bracket, which is disposed on the outer left and right sides. each of the running sections,
including a driving wheel arranged on the front side and a driven wheel arranged on the rear side supported by the corresponding side members;
The side member
a long hole that receives the axle of the driven wheel and is elongated in the front-rear direction;
a bolt coupled to the axle of the driven wheel and extending rearward through the rear member;
a position adjustment nut that is screwed onto the bolt and adjusts the longitudinal position of the bolt;
The bracket includes a main body portion coupled to the upper surface of the rear member and an extension portion extending downward from the main body portion and coupled to the rear surface of the rear member,
the extension is provided on only one of the side walls of the bracket;
The working machine according to claim 1 or 2, wherein the lower end of the extension portion is located below the position adjusting nut. A working machine according to any one of claims 3 to 5, wherein the extension has the same thickness as the corresponding side wall. The working machine according to any one of claims 1 to 6, wherein each side member and the rear member are fastened by a plurality of fastening members arranged on left and right inner sides and left and right outer sides of the side walls, respectively. The side member has an outer wall extending in the vertical direction and an upper wall extending left and right inward from the upper end of the outer wall, and the upper wall widens left and right inward toward the rear end. has
8. The working machine according to claim 7, wherein each side member and the rear member are coupled to the widened portion at positions vertically corresponding to each other. The work machine according to any one of claims 1 to 8, wherein the side bar has a lower end extending along the vertical wall of the corresponding bracket.

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