JP2015097491A - Walk-management machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walk-management machine in which operability in both of a work posture and a turning posture is improved while improving visibility of an accelerator lever.SOLUTION: An accelerator lever is supported by one holding bar so that a turning shaft of a movable body in the accelerator lever may be positioned along a substantially vertical line and inside in the machine body width direction from one hand of a pair of holding bars. The accelerator lever is disposed so that the lower end of a lever body of the accelerator lever is positioned at the same position as a virtual reference plane or downward more than the virtual reference plane and the upper end of the lever body is positioned upward more than the upper end of one of the holding bars, concerning the direction perpendicular to a symmetrical virtual reference plane on the basis of a vertical plane being a virtual reference plane passing an axis line of one of the holding bars and passing the axis line.

Description

  The present invention relates to a walking-type management machine, and more particularly to a walking-type management machine in which an accelerator lever for changing the number of revolutions of an engine is provided at a grip portion of a steering handle.

  Rotational power is operatively transmitted from the engine supported by the vehicle body frame to the traveling wheels and the rotary tiller, and the steering handle is connected to the vehicle body frame. A possible accelerator lever is provided, and the output rotational speed of the engine is changed in accordance with the operation of the accelerator lever.

  The accelerator lever is provided on one of a pair of left and right grip bars along the longitudinal direction of the body of the steering handle.

  For example, in Patent Document 1 below, a steering handle including a pair of left and right grip bars along the longitudinal direction of the machine body and a width direction grip bar connecting the rear ends of the pair of grip bars, and the steering handle A walking-type management machine having a deadman clutch lever supported by a gripping portion, and supported by an accelerator lever so as to be rotatable about a rotation axis along the width of the vehicle body on one outer surface of the pair of gripping bars. A walking type management machine is disclosed.

  The walking type management machine described in Patent Document 1 is useful in that the accelerator lever can be disposed in the vicinity of a portion of the steering handle held by an operator while preventing interference with the deadman clutch lever. However, there is a problem that it is difficult for an operator to visually recognize the operation position of the accelerator lever around the rotation axis.

  In addition, when an operator performs a tilling operation using a walking type management machine, generally, the operator holds his / her palm downward and covers the corresponding gripping bar from above (FIG. 6 (a However, the configuration described in Patent Document 1 has a problem that it is difficult to operate the accelerator lever in the working posture.

  Furthermore, when turning the walking type management machine, an operator needs to lift the rotary tillage device upward from the ground surface with the traveling wheel as a fulcrum. A posture is taken (see FIG. 6 (b), hereinafter referred to as a turning posture) in which the palm is directed inward in the body width direction and the corresponding gripping bar is covered from the outside in the body width direction. The configuration described in Patent Document 1 has a problem that it is difficult to operate the accelerator lever even in the turning posture.

  As a configuration that can improve the visibility of the accelerator lever, the following Patent Document 2 discloses a walking type management machine in which the accelerator lever is supported on one upper surface of a pair of left and right grip bars extending in the longitudinal direction of the machine body. ing.

  Specifically, in the walking type management machine described in Patent Document 2, the rear ends of the pair of left and right grip bars are free ends, and the accelerator lever rotates around a rotation axis that is substantially vertical. It is supported on one upper surface of the pair of gripping bars in a movable state.

  Although the walking type management machine described in Patent Document 2 has an advantage that an operator can easily visually recognize the operation position of the accelerator lever around the rotation axis, the accelerator is in both the work posture and the turning posture. About the point which is hard to operate a lever, it is the same as the structure of the said patent document 1. FIG.

Japanese Patent No. 5283599 Japanese Patent No. 4782275

  The present invention has been made in view of such prior art, and can easily recognize the operation position of the accelerator lever for changing the output speed of the engine, and further, both the working posture and the turning posture. An object of the present invention is to provide a walking type management machine capable of improving the operability of the accelerator lever.

  In order to achieve the above object, the present invention operatively transmits rotational power from an engine supported by a vehicle body frame to a traveling wheel and a rotary tiller, and a steering handle connected to the vehicle body frame includes an airframe. It is a walking type management machine having a pair of left and right grip bars that can be gripped along the front-rear direction, and an accelerator lever for changing the output speed of the engine is supported on one of the pair of grip bars. The accelerator lever includes a fixed body, a movable body that is rotatable about a rotation axis with respect to the fixed body, and is rotated about the rotation axis together with the movable body and the rotation shaft. A lever body having a predetermined length in a direction along the vertical direction, and the fixed body is positioned on the one side so that the pivot shaft is positioned substantially vertically and inward of the one gripping bar in the body width direction. Directly on the gripping bar Indirectly supported, the engine is configured such that the output rotational speed is changed according to the operation position of the movable body and the lever body around the rotation axis, and the accelerator lever is A virtual reference plane that passes through the axis of the gripping bar and that is perpendicular to the virtual reference plane that is symmetric with respect to a vertical plane that passes through the axis, the lower end of the lever body is the same as the virtual reference plane Provided is a walking-type management machine that is positioned so as to be located below the position or the virtual reference plane and that the upper end of the lever body is located above the upper end of the one gripping bar.

  Preferably, the accelerator lever is arranged so that a lower end portion of the lever body is positioned below a lower end of the one gripping bar in a direction orthogonal to the virtual reference plane.

Preferably, the walking-type management machine is supported by a main clutch mechanism inserted in a transmission path from the engine to the traveling wheel, and the steering handle, and engages and disengages power transmission of the main clutch mechanism. A deadman clutch lever to perform.
The steering handle has a width direction gripping bar that connects rear ends of the pair of gripping bars, and the deadman clutch lever is pivotable about a pivot shaft along the body width direction. A pair of front-rear bars supported directly or indirectly by the grip bars, and a width-direction bar connecting the rear ends of the pair of front-rear bars, the front-rear bars and the grip bars A pair or a clutch engaging position at which at least one pair of the width direction bar and the width direction gripping bar can be gripped simultaneously and a clutch release position displaced upward from the clutch engagement position around the pivot shaft The deadman clutch in a state in which the accelerator lever is urged toward the clutch release position, and the accelerator lever is positioned at the clutch release position. It may be located forward of the bar.

  According to the walking type management machine according to the present invention, the accelerator lever is located on the one side so that the rotation axis of the movable body on the accelerator lever is substantially vertical and located inward in the body width direction from one of the pair of gripping bars. Therefore, the visibility of the operator with respect to the operation state of the accelerator lever can be improved.

  The accelerator lever is a virtual reference plane that passes through the axis of the one gripping bar and is perpendicular to a virtual reference plane that is symmetric with respect to a vertical plane that passes through the axis. Arranged so that the lower end of the lever body is located at the same position as or below the virtual reference plane, and the upper end of the lever body is located above the upper end of the one gripping bar Therefore, the operability of the accelerator lever can be improved in both the working posture when performing the tilling work and the turning posture when performing the turning operation.

FIG. 1 is a side view of a walking type management machine according to an embodiment of the present invention. FIG. 2 is a perspective view of a grip portion of the steering handle in the walking management machine. FIG. 3 is a plan view of the grip portion. FIG. 4 is a schematic perspective view of an accelerator lever provided in the walking management machine. 5 (a) and 5 (b) are schematic views showing the relative positions of the accelerator lever and one of a pair of gripping bars that support the accelerator lever, respectively, as viewed from the inside in the body width direction. The state seen from the back of the body is shown. 6 (a) and 6 (b) are schematic diagrams showing a state in which the operator is holding the grip bar, showing the working posture when performing the tilling work and the turning posture when performing the turning operation, respectively. ing. FIGS. 7A and 7B are schematic views corresponding to FIGS. 5A and 5B in the modified example. FIGS. 8A and 8B are schematic views corresponding to FIGS. 5A and 5B in another modification.

Hereinafter, a preferred embodiment of a walking management machine according to the present invention will be described with reference to the accompanying drawings.
In FIG. 1, the side view of the said walk type management machine 1 is shown.

  As shown in FIG. 1, the walking type management machine 1 includes a vehicle body frame 10, an engine 20 supported by the vehicle body frame 10, a traveling wheel 30 to which rotational power is operatively transmitted from the engine 20, and a rotary. A tilling device 40 and a steering handle 60 connected to the body frame 10 are provided.

  In the present embodiment, the walking management machine 1 further includes a transmission 50 that is inserted in a transmission path from the engine 20 to the traveling wheel 30 and the rotary tiller 40.

  The transmission 50 includes a speed change mechanism (not shown), a travel system transmission mechanism (not shown), a work machine system transmission mechanism 55, and a mission that houses the travel system transmission mechanism and the work machine system transmission mechanism 55. And a case 51.

In the present embodiment, the mission case 51 forms a part of the body frame 10.
That is, the vehicle body frame 10 includes the mission case 51 and the engine frame 12 connected to the mission case 51.

  As shown in FIG. 1, in the present embodiment, the mission case 51 has a substantially “h” shape in a side view.

  Specifically, the transmission case 51 includes an upper portion 51a that supports a transmission input shaft 52 that inputs rotational power from the engine 20, and a first portion that extends downward from the upper portion 51a and supports the axle 31 of the traveling wheel 30. 1 downwardly extending portion 51b and obliquely extending downward and rearward from the upper portion 51a so as to be located on the rear side of the machine body from the first downwardly extending portion 51b to support the tilling shaft 41 of the rotary tiller 40 A second downwardly extending portion 51c.

  As shown in FIG. 1, the engine frame 12 extends forward from the mission case 51 substantially horizontally and supports the engine 20 on the upper surface.

  The engine 20 includes an engine main body 21 supported by the engine frame 12 and an engine output shaft 22 that outputs rotational power.

  The engine 20 is configured to change the speed of the rotational power output from the engine output shaft 22 in response to an artificial operation on the accelerator lever 100 (see FIG. 1) supported by the steering handle 60. Yes.

  In the present embodiment, as shown in FIG. 1, the engine output shaft 22 is along the body width direction, and the transmission input shaft 52 is also supported by the transmission case 51 along the body width direction. .

Rotational power is transmitted from the engine output shaft 22 to the transmission input shaft 52 via an endless transmission mechanism 25.
Specifically, as shown in FIG. 1, the endless transmission mechanism 25 includes an output pulley 25 a that is supported on the engine output shaft 22 so as not to rotate relative to the engine output shaft 22, and an input that is supported on the transmission input shaft 52 so as not to rotate relatively. A pulley 25b and a belt 25c wound around the output pulley 25a and the input pulley 25b are provided.

  The walking type management machine 1 further includes a main clutch mechanism 35 that engages and disengages power transmission from the engine 20 to the traveling wheel 30 and the rotary tiller 40.

  In the present embodiment, the main clutch mechanism 35 is configured to selectively engage and disengage the power transmission by the endless body transmission mechanism 25.

  Specifically, as shown in FIG. 1, the main clutch mechanism 35 includes a tension arm 35 a that is rotatable about a pivot shaft parallel to the engine output shaft 22 and the transmission input shaft 52, and the belt 25 c. A tension pulley 35b supported by the tension arm 35a so as to be engageable, and a biasing member (not shown) for biasing the tension arm in a direction in which the tension pulley 35b is separated from the belt 25c. ing.

The main clutch mechanism 35 operates as follows.
In a state where no external operating force is received, the tension arm 35a does not act on the belt 25c, whereby the belt 25c slips with respect to the engine output shaft 22 and the transmission input shaft 52, Power transmission from the engine 20 to the transmission 50 is released.

On the other hand, when an external operating force is applied to the tension arm 35a so that the tension pulley 35b acts on the belt 25c against the urging force of the urging member, the belt 25c is connected to the engine output shaft. 22 and the transmission input shaft 52 become non-rotatable and power is transmitted from the engine 20 to the transmission 50.
The engagement / disengagement operation of the main clutch mechanism 35 is performed in response to a manual operation on the deadman clutch lever 70 (see FIG. 1).

  The speed change mechanism is configured to change the rotational power input to the transmission input shaft 52 in accordance with a manual operation to the speed change lever 80 (see FIG. 1).

  Specifically, the speed change mechanism is configured to transmit a high speed rotational power to the traveling system power transmission mechanism while releasing power transmission to the work machine system power transmission mechanism 55 according to an operation to the speed change lever 80, The neutral state in which the power transmission to the traveling system transmission mechanism is canceled while the power transmission to the working machine system transmission mechanism 55 is canceled, and the traveling system transmission mechanism is released from the power transmission to the work machine system transmission mechanism 55. A low-speed moving state in which low-speed rotational power is transmitted to the vehicle, a forward-rotation working state in which normal rotational rotational power is transmitted to the work machine transmission mechanism 55 while transmitting low-speed rotational power to the traveling transmission mechanism, and the traveling transmission A reverse rotation working state in which reverse rotation rotational power is transmitted to the work machine transmission mechanism 55 is selectively made to appear while low speed rotational power is transmitted to the mechanism.

The traveling system transmission mechanism is configured to transmit the traveling system rotational power transmitted from the transmission mechanism to the axle 31 of the traveling wheel 30.
The traveling transmission mechanism can take various forms such as a gear transmission mechanism and an endless transmission mechanism such as a sprocket / pulley.

  The traveling wheel 30 includes the pair of left and right axles 31 and a pair of left and right wheels 32 supported respectively by the pair of axles 31.

In the present embodiment, the traveling system transmission mechanism is configured to differentially transmit the traveling system rotational power to the pair of axles 31.
Specifically, as shown in FIG. 1, the traveling system transmission mechanism includes a differential gear device 53 that differentially transmits the traveling system rotational power to the pair of axles 31.

  The differential gear device 53 is configured to differentially distribute the traveling system rotational power to the pair of axles 31 in accordance with a traveling load applied to the pair of axles 31. 1 smooth turning is possible.

In the present embodiment, the differential gear device 53 has a differential lock device (not shown).
The differential lock device disables the differential transmission function of the differential gear device 53 in response to an external operation and forcibly drives the pair of axles 31 synchronously.
The differential lock device operates in response to an artificial operation on the differential lock lever 90 (see FIG. 1).

  The work machine transmission mechanism 55 is configured to transmit the work machine rotation power transmitted from the transmission mechanism to the tilling shaft 41 of the rotary tiller 40.

  In the present embodiment, as shown in FIG. 1, the work machine system transmission mechanism 55 includes a PTO shaft 55a that inputs the work machine system rotational power, and a drive that is supported by the PTO shaft 55a so as not to be relatively rotatable. It has a sprocket 55b, a driven sprocket 55c supported by the tilling shaft 41 so as not to rotate relative to it, and a chain 55d wound around the drive sprocket 55b and the driven sprocket 55c.

  The rotary tiller 40 includes the tilling shaft 41 and a plurality of tilling claws 42 provided on the outer peripheral surface of the tilling shaft 41.

2 and 3 are a perspective view and a plan view of the vicinity of the grip portion of the steering handle 60. FIG.
As shown in FIGS. 1 to 3, the steering handle 60 includes a connecting portion 61 connected to the vehicle body frame 10 and a gripping portion 62 supported by the connecting portion 61.

In the present embodiment, as shown in FIG. 1, the connecting portion 61 has a pair of left and right connecting bars 61a.
Each of the pair of connecting bars 61 a extends rearward and upward in a state where the base end portion is connected to the left and right outer surfaces of the mission case 51.

As shown in FIGS. 2 and 3, the grip portion 62 has a pair of left and right grip bars 62a along the longitudinal direction of the machine body so that an operator can grip the grip portion 62.
In the present embodiment, the pair of gripping bars 62a are connected to the free ends of the pair of connecting bars 61a, respectively.

In the present embodiment, the grip portion 62 is a loop type.
That is, as shown in FIGS. 2 and 3, the grip portion 62 has a width-direction grip bar 62b that connects the rear ends of the pair of grip bars 62a in addition to the pair of grip bars 62a. ing.
The width-direction gripping bar 62b is also configured so that an operator can grip it.

  As shown in FIGS. 1 to 3, the accelerator lever 100 is supported on the steering handle 60.

FIG. 4 shows a perspective view of the accelerator lever 100.
As shown in FIGS. 2 and 4, the accelerator lever 100 includes a fixed body 101, a movable body 102, and a lever body 103.

The movable body 102 is rotatable about a rotation axis X (see FIG. 3) with respect to the fixed body 101.
The lever body 103 is connected to the movable body 102 so as to be rotated about the rotation axis X together with the movable body 102, and has a predetermined length in a direction along the rotation axis X. ing.

The accelerator lever 100 is a member for changing the speed of the rotational power output from the engine output shaft 22.
That is, the speed of the rotational power output from the engine output shaft 22 is changed according to the operation position around the rotation axis X of the movable body 102 operated via the lever body 103. ing.

  The accelerator lever 100 is supported by one of the pair of gripping bars 62a (in this embodiment, the gripping bar on the right side as viewed from the rear of the machine body).

Specifically, as shown in FIGS. 2 and 3, the fixed body 101 is positioned on the one side so that the rotation axis X is substantially vertical and is located inward in the body width direction from the one gripping bar 62 a. It is supported directly or indirectly by the gripping bar 62a.
In the present embodiment, the fixed body 101 is supported by a bracket 105 connected to the one gripping bar 62a.

  5A and 5B are schematic views showing the relative positional relationship between the accelerator lever 100 and the one gripping lever 62a. 5 (a) and 5 (b) show a state viewed from the inside in the body width direction and a state viewed from the rear of the body, respectively.

  As shown in FIGS. 5A and 5B, the accelerator lever 100 is a virtual reference plane RP that passes through the axis L of the one gripping bar 62a and is based on a vertical plane VP that passes through the axis L. The lower end portion of the lever body 103 is located at the same position as the virtual reference plane RP, and the upper end portion of the lever body 103 is the one of the one side with respect to the direction D orthogonal to the virtual reference plane RP that is symmetric with respect to the left and right sides. It arrange | positions so that it may be located above the upper end of the holding | grip bar 62a.

According to the walking type management machine 1 having such a configuration, the following effects can be obtained.
The accelerator lever 100 is supported by the one gripping bar 62a in a state where the rotation axis X is substantially perpendicular and is located inward of the one gripping bar 62a in the body width direction. An operator can easily visually recognize the operation positions of the body 102 and the lever body 103 around the rotation axis X.

  Further, with respect to the direction D orthogonal to the virtual reference plane RP, the lower end portion of the lever body 103 is positioned at the same position as the virtual reference plane RP, and the upper end portion of the lever body 103 is the one gripping bar 62a. Therefore, it is possible to improve the operability of the accelerator lever 100 by the operator in both the working posture and the turning posture.

  That is, when performing the tilling work using the walking type management machine 1, the worker holds the palm so that the palm is directed downward and covers the gripping bar 62a from above (see FIG. 6A). Take.

Specifically, as shown in FIG. 6A, in the work posture, the operator's thumb is located at the same height as the grip bar 62a or below the grip bar 62a.
In this regard, in the walking type management machine 1 according to the present embodiment, the lower end portion of the lever body 103 is located at the same position as the virtual reference plane RP (FIGS. 5A and 5B). )), The accelerator lever 100 can be easily operated with the thumb in the working posture.

  Furthermore, when turning the walking type management machine 1, the operator needs to lift the rotary tiller 40 upward from the ground surface with the traveling wheel 30 as a fulcrum. A turning posture (see FIG. 6 (b)) is taken so that the gripping bar 62a is covered from the outside in the width direction of the machine body with the inward direction in the body width direction.

Specifically, as shown in FIG. 6 (b), in the turning posture, the operator's thumb is positioned below the grip bar 62a.
In this regard, in the walking type management machine 1 according to the present embodiment, the upper end portion of the lever body 103 is positioned above the upper end of the one gripping bar 62a (see FIG. 5 (a) and (See (b)), the accelerator lever 100 can be easily operated with the thumb in the turning posture.

  In the present embodiment, as described above, the accelerator lever 100 is disposed so that the lower end portion of the lever body 103 is located at the same position as the virtual reference plane RP. The lower end of the lever body 103 is located at the same position as the lower end of the one gripping bar 62a (see FIGS. 7 (a) and (b)) or below the lower end (see FIGS. 8 (a) and (b)). It is also possible to arrange the accelerator lever 100 as described above.

  As described above, in the present embodiment, the steering handle 60 includes the pair of grip bars 62a along which the grip portion 62 extends in the longitudinal direction of the body and the width direction grip bars 62b along the width direction of the body. Further, the steering handle 60 supports the deadman clutch lever 70 for engaging and disengaging the main clutch mechanism 35.

  As shown in FIGS. 2 and 3, the deadman clutch lever 70 is supported by the pair of gripping bars 62 a so as to be pivotable about the pivot shaft Y along the body width direction. It has a front-rear direction bar 71 and a width-direction bar 72 that connects the rear ends of the pair of front-rear direction bars 71.

  The deadman clutch lever 70 has at least one pair of the front / rear direction bar 71 and the gripping bar 62a or the pair of the width direction bar 72 and the widthwise gripping bar 62b around the pivot shaft Y. It is possible to rotate between a clutch engaging position that can be gripped simultaneously and a clutch releasing position that is displaced upward from the clutch engaging position about the pivot shaft Y, and an urging member (FIG. (Not shown) is biased toward the clutch release position.

  That is, an operator holds the deadman clutch lever 70 together with the grip portion 62 of the steering handle 60 against the urging force of the urging member to position the deadman clutch lever 70 at the clutch engagement position. When the main clutch mechanism 35 is engaged, and the operator releases the grip of the deadman clutch lever 70, the deadman clutch lever 70 is positioned at the clutch release position by the urging force of the urging member. In response to this, the main clutch mechanism 35 enters the clutch release state.

As described above, when the grip portion 62 of the steering handle 60 is a loop type and the deadman clutch lever 70 is supported by the steering handle 60, as shown in FIGS. The accelerator lever 100 is disposed in front of the deadman clutch lever 70 in a state where the accelerator lever 100 is positioned at the clutch release position.
According to such a configuration, the various effects can be obtained without the accelerator lever 100 interfering with the deadman clutch lever 70.

DESCRIPTION OF SYMBOLS 1 Walk type management machine 10 Body frame 20 Engine 30 Running wheel 35 Main clutch mechanism 40 Rotary tillage device 60 Steering handle 62a Grasp bar 62b Width direction grip bar 70 Deadman clutch lever 71 Front / rear direction bar 72 Width direction bar 100 Acceleration lever 101 Fixation Body 102 Movable body 103 Lever body RP Virtual reference plane VP Vertical plane

Claims (3)

A pair of left and right grips capable of operatively transmitting rotational power from the engine supported by the body frame to the traveling wheels and the rotary tiller, and a steering handle coupled to the body frame to be gripped along the longitudinal direction of the body. A walking-type management machine that has a bar, and an accelerator lever that changes an output speed of the engine is supported on one of the pair of gripping bars,
The accelerator lever includes a fixed body, a movable body that is rotatable about a rotation axis with respect to the fixed body, and is rotated about the rotation axis together with the movable body and along the rotation axis. A lever body having a predetermined length in a predetermined direction, and the fixed body is positioned on the one gripping bar so that the pivot shaft is substantially perpendicular and located inward of the one gripping bar in the body width direction. Directly or indirectly supported by
The engine is configured such that the output rotational speed is changed according to an operation position around the rotation axis of the movable body and the lever body,
The accelerator lever is a virtual reference plane that passes through the axis of the one gripping bar, and a lower end of the lever body with respect to a direction orthogonal to a virtual reference plane that is symmetrical with respect to a vertical plane that passes through the axis. The portion is located at the same position as the virtual reference plane or below the virtual reference plane, and the upper end of the lever body is positioned above the upper end of the one gripping bar. A walking type management machine.   The said accelerator lever is arrange | positioned so that the lower end part of the said lever body may be located below the lower end of said one holding bar regarding the direction orthogonal to the said virtual reference plane. Walking management machine. A main clutch mechanism that is inserted in a transmission path from the engine to the traveling wheel; and a deadman clutch lever that is supported by the steering handle and engages and disengages power transmission of the main clutch mechanism,
The steering handle has a width direction gripping bar that connects rear ends of the pair of gripping bars,
The deadman clutch lever includes a pair of front-rear bars supported directly or indirectly by the pair of grip bars so as to be pivotable about a pivot shaft along the width direction of the machine body, and a rear of the pair of front-rear bars. A clutch engagement position having a width-direction bar connecting ends, and at least one pair of the front-rear direction bar and the gripping bar or the pair of the width-direction bar and the width-direction gripping bar can be gripped simultaneously. Between the clutch engagement position and the clutch release position displaced upward about the pivot axis, and is pivotable about the pivot axis, and is biased toward the clutch release position,
The walking accelerator according to claim 1 or 2, wherein the accelerator lever is disposed in front of the deadman clutch lever in a state where the accelerator lever is positioned at a clutch release position.

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