JP4746522B2 - Walking type work machine - Google Patents

Description

The present invention relates to a walking-type working machine including a steering handle having a pair of left and right vehicle body front and rear bar handles, and right and left operation levers supported by the bar handles so as to be swingable.

  Conventionally, as the above-described walking type work machine, there has been one shown in Patent Document 1, for example. The walking type working machine shown in Patent Document 1 includes a steering handle having a pair of left and right handle rod bodies (corresponding to a bar handle). The steering handle includes a brake lever (corresponding to an operation lever) supported by one handle rod body so as to be swingable and a cover through which the brake lever is inserted. The brake lever is swung along the second guide groove of the cover, and the cover is a lever guide.

JP-A-10-53168 (paragraphs [0016], [0018], FIGS. 1, 6, 8)

In this type of walking work machine, generally, a display surface for displaying the operation position of the operation lever is provided on the lever guide of the operation lever so that the operation position of the operation lever can be easily recognized. If a horizontal display surface is adopted as the display surface, the lever guide is likely to be an obstacle when looking under the steering handle if the display surface is easy to see.
That is, as the display surface becomes easier to see, the area of the display surface increases. If the area of the display surface in a horizontal state in the horizontal direction of the machine body increases, for example, when viewing a farm scene from above the steering handle, the farm scene portion that is hidden by the display screen and is difficult to see becomes wider.

  An object of the present invention is to provide a walking work machine that can be provided with a display surface having a large area while avoiding as much as possible the deterioration of the visibility caused by the display surface for an operating lever.

The first aspect of the present invention is a walking type work machine comprising a steering handle having a pair of left and right vehicle body front-rear bar handles, and right and left operation levers supported by the bar handles so as to be swingable.
The left and right lever guides cover the upper part of the bar handle and extend from the bar handle to the inside of the vehicle body. The right and left operation levers are inserted into the upper surfaces of the right and left lever guides, respectively. The upper and lower lever guides are configured to have inclined surfaces positioned at a lower arrangement height toward the inner side of the vehicle body,
On the upper surfaces of the right and left lever guides, display surfaces for displaying respective operation positions of the right and left operation levers are provided in an inclined state positioned at a lower arrangement height toward the inner side of the vehicle body.

According to the configuration of the first aspect of the present invention, since the display surface is in the inclined state even when the display surface of the upper surface of the right and left lever guides is easily viewed so that the display surface is inclined, The size in the lateral direction of the aircraft can be minimized. That is, for example, when viewing the farm scene from above the steering handle, the farm scene portion that is hidden by the display surface and is difficult to see is minimized.

As a result, the operation position of the right and left control levers can be recognized accurately and easily with an easy-to-see display surface, and the operation can be performed accurately and quickly. It is possible to obtain a walking type working machine that is excellent in both operation and work so that the user can work while knowing accurately and easily.

  According to a second aspect of the present invention, in the configuration of the first aspect of the invention, a switch operation panel having an engine stop operation switch is provided on the vehicle body rear side of the lever guide in an inclined state positioned at a lower arrangement height toward the vehicle rear side. It is.

  According to the configuration of the second aspect of the invention, the inclination of the switch operation panel makes it possible to set the engine stop switch in an upward rearward orientation so that it can be easily operated from the rear of the steering handle.

  As a result, the engine stop switch can be operated quickly and accurately.

  According to the third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the steering handle can be switched between a locked state in which the vertical angle cannot be changed and an unlocked state in which the vertical angle of the steering handle can be changed. A handle lock mechanism is provided, and an operating tool for switching the handle lock mechanism between a locked state and an unlocked state is disposed in the vicinity of the grip portion of the bar handle.

According to the configuration of the third aspect of the invention, it is possible to quickly and easily perform the leaning operation of the vehicle body by the raising and lowering operation of the steering handle.
In other words, when the steering handle is lowered and the vehicle body is tilted so that the front side in the traveling direction rises to the ground, if the upward angle of the steering handle with respect to the vehicle body is increased, the operator does not have to lean forward or less. You can easily lower the steering handle. When changing the steering handle upward to a large angle at the time of tilting the vehicle body and a small angle at the time of work, the handle lock mechanism is switched between a locked state and an unlocked state. At this time, since the operating tool for switching the handle lock mechanism is arranged near the grip part of the bar handle, the operating tool is operated quickly with the fingers of the hand while supporting the grip part of the steering handle. Can be changed.

  As a result, it is possible to obtain a walking type working machine that can quickly and easily perform a tilting operation of the vehicle body at the time of turning to perform work efficiently and easily.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a walking tractor according to an embodiment of the present invention. FIG. 2 is an overall side view of the walking tractor according to the embodiment of the present invention. As shown in these drawings, the walking tractor of the present embodiment is a self-propelled vehicle body that is self-propelled by a pair of left and right driveable tire wheels 1 and 1, and a rear end side of a body frame 2 of the self-propelled vehicle body. A bar-type steering handle 10 connected to the upper portion via a handle support frame 3 and a hitch 4 provided at the rear end of the vehicle body frame 2 are provided.
The walking tractor is configured to connect a rotary tiller (not shown) to the rear part of the self-propelled vehicle body via the hitch 4 and transmit the driving force of the engine 6 from the transmission case 5 to the rotary tiller. Then, various working devices are connected to the rear part of the self-propelled vehicle body, such as configuring a walking type tiller, and various walking type working machines are configured.

The self-propelled vehicle body will be further described in detail.
The vehicle body frame 2 includes the transmission case 5 having a pair of left and right axles 7 and 7 that can be driven at the lower portion, and an engine mounting frame 8 that extends forward from the front portion of the transmission case 5 toward the vehicle body. It is configured. The engine mounting frame 8 supports the engine 6. The mission case 5 inputs the driving force from the output shaft 6a of the engine 6 to the input shaft 5a via the main clutch 9 comprising a belt tension clutch, and the driving mission of the input shaft 5a is located in the mission case. (Not shown) is transmitted to the pair of left and right axles 7,7.

  As shown in FIGS. 1 and 3, the steering handle 10 includes a pair of left and right vehicle body front and rear bar handles 11 and 11, and a vehicle body sideways connection bar 12 that connects the front end portions of the left and right pair of bar handles 11 and 11. And a reinforcing stay 14 provided on both ends of the connecting bar 12 and a handle cover 13 that covers the connecting bar 12 and the reinforcing stay 14. In FIG. 3, the handle cover 13 is indicated by a two-dot chain line. The pair of left and right bar handles 11 and 11 and the connecting bar 12 are configured by a single round steel pipe bent into a substantially U-shape that is open toward the rear of the vehicle as viewed in the vertical direction of the vehicle. The steering handle 10 is connected to the rear end of the handle support frame 3 at an intermediate portion of the connecting bar 12. The connecting stays 14 on both ends of the connecting bar 12 are connected across the front end of the bar handle 11 and the end of the connecting bar 12 to improve the connecting strength between the connecting bar 12 and the bar handle 11.

  The front end portion of the handle support frame 3 is supported by the transmission case 5 so as to be freely rotatable around an axis P1 (see FIGS. 1 and 2) that is directed vertically to the vehicle body. The steering handle 10 shown by a solid line in FIG. 1 shows a rearward attached state. The steering handle 10 shown by a two-dot chain line in FIG. 1 shows a forward attachment state. As shown in this figure, the steering handle 10 is pivotally adjusted together with the handle support frame 3 around the shaft core P1, so that the steering handle 10 extends rearwardly from the mission case 2 and the mission case 2 It can be used by switching to a forward-mounted state that extends forward from the vehicle body.

  As shown in FIGS. 1 and 3, the handle support frame 3 includes a vehicle body side support frame 3a and a handle side support frame 3b formed as a separate member from the vehicle body side support frame 3a. . The vehicle body side support frame 3a is supported on the transmission case 5 so as to be rotatable around the axis P1. The handle-side support frame 3b is rotatably connected to the vehicle-body-side support frame 3a via a connecting shaft 15 located on one end side of the handle-side support frame 3b. It is connected to.

  As shown in FIG. 1, a handle lock mechanism 20 is provided across the vehicle body side support frame 3a and the handle side support frame 3b. FIG. 6 is a side view of the handle lock mechanism 20. As shown in this figure, the handle lock mechanism 20 is held by a lock plate 21 fixed to the rear end portion of the vehicle body side support frame 3a and a pin holder 22 fixed to the rear end portion of the handle side support frame 3b. And a lock spring 24 accommodated in the pin holder 22. The lock pin 23 is slidably biased by the lock spring 24 so that the front end portion 23a of the lock pin 23 is engaged with a plurality of pin holes 25 provided in the lock plate 24 in the vertical direction of the vehicle body. When the distal end portion 23 a of the lock pin 23 is engaged with any of the plurality of pin holes 23, the handle lock mechanism 20 supports the vehicle body side of the handle side support frame 3 b by the engagement of the lock pin 23 and the lock plate 21. The locked state is set so that the vertical swing with respect to the frame 3a is disabled, and thereby the vertical swing of the steering handle 10 is disabled. When the lock pin 23 is slid against the lock spring 24 and the tip 23a of the lock pin 23 is removed from the pin hole 25, the handle lock mechanism 20 moves the handle side support frame 3b up and down relative to the vehicle body side support frame 3a. The rocking is allowed, and thereby the unlocking state is set to allow the steering handle 10 to rock vertically.

That is, the steering handle 10 can be used by adjusting the height of the pair of left and right grips 11a, 11a relative to the self-propelled vehicle body to be lower or higher.
That is, the handle lock mechanism 20 is switched to the unlocked state. When the vertical swing lock by the handle lock mechanism 20 of the control handle 10 is released, the control handle 10 is controlled to swing up and down around the axis of the connecting shaft 15 together with the handle support frame 3b. Thereafter, the handle lock mechanism 20 is switched to the lock state, and the steering handle 10 is locked in the up-and-down swing state by the handle lock mechanism 20. Then, the steering handle 10 is in an attached state in which the upward angle with respect to the mission case 5 becomes large and the height of the pair of left and right grips 11a, 11a with respect to the self-propelled vehicle body increases, or the mission of the steering handle 10 The upward angle with respect to the case 5 becomes small, and the pair of left and right grips 11a, 11a may be in an attached state in which the height of the self-propelled vehicle body is low.

  As shown in FIGS. 1 and 3, the steering handle 10 has a steering clutch lever 30, a main clutch lever 31, and a finger provided in the vicinity of the grip portion 11 a of the bar handle 11 located on the left side in a rearwardly attached state. An operation clutch lever 32 and an engine stop switch 33 are provided. Further, the steering handle 10 has a steering clutch lever 30, a work clutch lever 34, a handle up / down operating tool 35, and an accelerator lever provided in the vicinity of the grip portion 11 a of the bar handle 11 located on the right side in a rearwardly attached state. 36. Further, the steering handle 10 includes an auxiliary clutch lever 37 supported across a pair of left and right bar handles 11. The left steering clutch lever 30 switches the steering clutch 52 (see FIG. 1) located inside the mission case 5 between the on state and the off state via the operation cable 40, thereby self-propelled. The left tire wheel 1 is switched between a driving state and a stopped state so as to steer the vehicle body. The right steering clutch lever 30 is operated to switch the steering clutch 52 located inside the mission case 5 between the on state and the off state via the operation cable 40, thereby steering the self-propelled vehicle body. The right tire wheel 1 is switched between a driving state and a stopped state so as to do this. The accelerator lever 36 operates an accelerator device (not shown) of the engine 6 via an operation cable 46.

FIG. 3 is a plan view of the steering handle 10. FIG. 4 is a side view of the left operation portion provided with the main clutch lever 31. FIG. 7 is a longitudinal rear view of the operation lever arrangement portion of the steering handle 10. As shown in these drawings, the left operation section includes the main clutch lever 31 and a lever guide 41 made by molding a resin material. A boss portion 31a of the main clutch lever 31 is rotatably connected to a lever support portion 60 (see FIG. 9) provided by fixing a sheet metal member to the bar handle 11 via a lever support shaft 61. The main clutch lever 31 is supported by the lever support portion 60 so as to swing around the vehicle body lateral axis of the lever support shaft 61. A base portion of the main clutch lever 31 is interlocked with the main clutch 9 via an arc-shaped interlocking rod 68 and an operation cable 42. The lever guide 41 is fixed to a bracket 62 (see FIG. 9) that is connected to the front end side and the rear end side of the lever support portion 60. As shown in FIGS. 7 and 11, the lever guide 41 covers the upper portion of the bar handle 11 and extends from the bar handle 11 to the vehicle body inner side, and the main clutch lever 31 is inserted into the upper surface 41 a of the lever guide 41. The upper surface 41a of the lever guide 41 is formed on an inclined surface positioned at a lower arrangement height toward the inner side of the vehicle body, and is disposed on the inner side in the lateral direction of the vehicle body than the guide groove 63. and a display surface 6 4 provided on the upper surface 41a of the lever guide 41. As shown in FIG. 7, the display surface 64 is formed on an inwardly inclined surface in an inclined state located at a lower arrangement height toward the inner side of the vehicle body. The display surface 64 is provided with a character-type index 65 for displaying the operation position of the main clutch lever 31 on the front end side of the guide groove 63, and a character-type index for displaying the operation position of the main clutch lever 31. 66 is arranged on the rear end side of the guide groove 63.

  That is, the main clutch lever 31 is swung in the longitudinal direction of the vehicle body along the guide groove 63 around the axis of the lever support shaft 61, and the main clutch lever 31 is moved to the entering operation position indicated by the index 65 on the front end side of the guide groove 63. When operated, the operation cable 42 is pulled and the main clutch 9 is switched to the engaged state. The main clutch lever 31 is operated to the disconnection operation position indicated by the index 66 on the rear end side of the guide groove 63, thereby loosening the operation cable 42 and switching the main clutch 9 to the disconnection state.

  As shown in FIGS. 3 and 11, the lever guide 41 includes a switch operation panel 43 that is connected to the rear side of the vehicle body. The switch operation panel 43 is provided with the engine stop switch 33 supported by a switch mounting plate 67 (see FIGS. 4 and 9) connected to the rear end side of the lever support portion 60. The engine stop switch 33 stops the engine 6 when pressed. As shown in FIGS. 4 and 11, the switch operation panel 43 is in an inclined state located at a lower arrangement height on the rear side of the vehicle body, and is directed upward rearward so that the push button of the engine stop switch 33 can be easily operated from the rear. It is in the posture. The lever guide 41 and the switch operation panel 43 are produced by integral molding of a resin material.

  The finger operation clutch lever 32 is operated to swing up and down by a finger of a hand supporting the grip portion 11a, thereby operating the main clutch lever 31 to switch the main clutch 9. The auxiliary clutch lever 37 is operated to swing to the lowering cut position against the restoring force to the ascending entry position, thereby switching the main clutch lever 31 to the disengaged state and stopping the self-running vehicle body.

FIG. 5 is a side view of the right operation unit including the work clutch lever 34. As shown in this figure and FIGS. 3 and 7, the right operation portion includes the working clutch lever 34 and a lever guide 44 made by molding a resin material. A boss portion 34a of the work clutch lever 34 is rotatably connected to a lever support portion 70 (see FIG. 8) provided by fixing a sheet metal member to the bar handle 11 via a lever support shaft 71. The work clutch lever 34 is supported by the lever support portion 70 so as to swing around the vehicle body lateral axis of the lever support shaft 71. The base end portion 34 b of the work clutch lever 34 is linked to a work clutch (not shown) located inside the mission case 5 via the operation cable 45. The lever guide 44 is fixed to a bracket 72 (see FIG. 8) that is connected to the front end side and the rear end side of the lever support portion 70. As shown in FIGS. 7 and 10, the lever guide 44 covers the top of the bar handle 11 and extends from the bar handle 11 to the vehicle body inward side, and the work clutch lever 34 is inserted into the upper surface 44 a of the lever guide 44. The upper surface 44a of the lever guide 44 is formed on an inclined surface located at a lower arrangement height toward the inner side of the vehicle body, and is disposed on the inner side in the lateral direction of the vehicle body than the guide groove 73. and a display surface 7 4 provided on the upper surface 44a of the lever guide 44. As shown in FIG. 7, the display surface 74 is formed on an inwardly inclined surface in an inclined state located at a lower arrangement height toward the inner side of the vehicle body. The display surface 74 includes a character-type index 75 for indicating the operation position of the operation clutch lever 34 disposed on the front end side of the guide groove 73, and a character-type index for displaying the operation position of the work clutch lever 34. 76 is arranged on the rear end side of the guide groove 73.

  That is, the work clutch lever 34 is swung in the longitudinal direction of the vehicle body along the guide groove 73 around the axis of the lever support shaft 71, and is in the entering operation position displayed by the index 75 on the front end side of the guide groove 73. By being operated, the work clutch is switched to the engaged state via the operation cable 45 to drive the work device, and is operated to the cutting operation position displayed by the index 76 on the rear end side of the guide groove 73. Thus, the work clutch is switched to the disengaged state via the operation cable 45 to stop the work device.

  FIG. 12 is a rear view of the fixing structure of the lever guides 41 and 44 of the left operation unit and the right operation unit. As shown in FIG. 10, FIG. 10, and FIG. 11, the lever guide 41 of the left operation portion includes an attachment protrusion 41a that protrudes from the back side thereof, and a positioning protrusion 41b. The lever guide 44 of the right operation unit includes an attachment projection 44a projecting on the back side thereof and a positioning projection 44b. The positioning protrusions 44b of the lever guides 41 and 44 are engaged with the positioning holes 62a and 72a of the brackets 62 and 72 to position the lever guides 41 and 44 with respect to the lever support portions 60 and 70. The mounting protrusions 41 a and 44 a of the lever guides 41 and 44 are fastened and connected to the brackets 62 and 72 by mounting screws 55 to fix the lever guides 41 and 44 to the brackets 62 and 72.

  As shown in FIG. 5, a boss portion 35a of the handle up / down operation tool 35 is rotatably connected to the lever support portion 70 via the lever support shaft 71. The support portion 70 is supported so as to swing up and down around the vehicle body lateral axis of the lever support shaft 71. A base portion 35 b of the handle up / down operation tool 35 is connected to the lock pin 23 of the handle lock mechanism 20 via an operation cable 47. The operation part 35a of the handle up / down operation tool 35 is located in the vicinity of the grip part 11a so that it can be operated by a finger of a hand supporting the grip part 11a.

  That is, when the rotary tiller is connected to the rear part of the self-propelled vehicle body and the operation handle 10 is attached in a forward-facing state, the operation handle 10 is lowered to incline the self-propelled vehicle body about the axis of the axle 7, Turn while raising the rotary tiller to the ground. At this time, the upward angle of the steering handle 10 with respect to the mission case 5 is increased so that the steering handle 10 can be easily lowered without taking a forward bending posture as much as possible. After the turn is completed, the upward angle of the steering handle 10 with respect to the mission case 5 is returned to the original small angle for work. Thus, the handle up / down operation tool 35 can be operated while supporting the grip portion 11a of the bar handle 11 so that the operation of changing the vertical angle of the steering handle 10 can be performed quickly. When the handle up / down operation tool 35 is pivoted down, the handle lock mechanism 20 is switched to the unlocked state by pulling the operation cable 47. When the lowering operation is released, the handle up / down operation tool 35 swings up and down for the lock spring 24, loosens the operation cable 47, and switches the handle lock mechanism 20 to the locked state.

  The operation cable 40 linked to each steering clutch lever 30 is linked to the steering clutch via a cable switching device 50 (see FIGS. 3 and 6) supported by the handle support frame 3. When the mounting direction of the steering handle 10 is switched between the backward direction and the forward direction, the cable switching device 50 operates along with this, and the interlocking state between the pair of steering clutch levers 30 and 30 and the pair of steering clutches is changed. It automatically switches to the one corresponding to the mounting direction of the steering handle 30. That is, when the steering handle 10 is attached in the rearward direction, the steering clutch lever 30 that is positioned on the left side in the forward direction of the self-propelled vehicle body in this case corresponds to the tire wheel 1 on the left side of the self-propelled vehicle body. In this case, the steering clutch lever 30 that is located on the right side of the forward direction of the self-propelled vehicle body is interlocked with the steering clutch corresponding to the tire wheel 1 on the right side of the self-propelled vehicle body. When the steering handle 10 is attached forward, the steering clutch lever 30 that is positioned on the left side in the forward direction of the self-propelled vehicle body in this case is steered corresponding to the tire wheel 1 on the right side of the self-propelled vehicle body. In this case, the steering clutch lever 30 that is positioned on the right side of the forward direction of the self-propelled vehicle body is interlocked with the steering clutch corresponding to the tire wheel 1 on the left side of the self-propelled vehicle body.

  The present invention can be applied to a bar-type steering handle attached to various working machines such as a bar-type steering handle provided to a walking type rice transplanter, in addition to a bar type steering handle provided to a walking type tractor. Accordingly, the walking type tractor, the walking type rice transplanter and the like are collectively referred to as a walking type work machine.

Overall side view of walking tractor Overall plan view of walking tractor Top view of the steering handle Side view of the left operation unit Side view of the right operation unit Side view of handle lock mechanism Rear view of the control lever on the control handle Plan view of lever support Plan view of lever support Plan view of lever guide of right operation section Plan view of the lever guide of the left operation unit Rear view of lever guide fixing structure

10 Steering handle 11 Bar handle 20 Handle lock mechanism 31, 34 Operation lever 35 Operation tool 41, 44 Lever guide
41a, 44a Lever guide top surface 43 Switch operation panel
63, 73 Guide grooves 64, 74 Display surface

Claims (3)

A walking type work machine comprising a steering handle having a pair of left and right vehicle body front and rear bar handles, and right and left operation levers supported by the bar handles so as to be swingable.
The left and right lever guides cover the upper part of the bar handle and extend from the bar handle to the inside of the vehicle body. The right and left operation levers are inserted into the upper surfaces of the right and left lever guides, respectively. The upper and lower lever guides are configured to have inclined surfaces positioned at a lower arrangement height toward the inner side of the vehicle body,
A walking type having a display surface for displaying the operation position of each of the right and left operation levers on an upper surface of the right and left lever guides in an inclined state positioned at a lower arrangement height toward the inner side of the vehicle body. Work machine.   The walking type work machine according to claim 1, wherein a switch operation panel having an engine stop operation switch is provided on the rear side of the lever guide in an inclined state positioned at a lower arrangement height toward the rear side of the vehicle body.   Provided is a handle lock mechanism that can be switched between a locked state in which the steering handle is fixed so that the vertical angle cannot be changed and an unlocked state in which the vertical angle of the steering handle can be changed, and the handle lock mechanism is in a locked state and an unlocked state. The walking type working machine according to claim 1 or 2, wherein an operation tool for switching between and is disposed near a grip portion of the bar handle.

Images