JP7086014B2 - Working machine - Google Patents

Description

The present invention relates to a working machine such as a rice transplanter or a tractor, and more specifically, the present invention is configured to stop an engine by operating a shift lever capable of operating a traveling transmission to an engine stop position. Regarding work equipment.

In the above working machine, conventionally, when the shift lever is operated to the engine stop position, the rod-shaped detection operation unit that moves integrally with the shift lever is configured to detect the engine stop position sensor. The torsion spring that moves and urges the detection operation unit to the stop position side has a spiral winding portion in the middle, and one end that acts on the detection operation portion has a spiral winding portion on the tip side. The spring wire was bent into a substantially L shape so as to extend along the overlapping direction, and the other end was a shape in which the spring wire was extended in a straight line (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-79040

In the above-mentioned conventional configuration, one end of the torsion spring is in contact with the detection operation portion and the spiral winding portion is elastically deformed in the twisting direction to move and urge the detection operation portion. .. In such a configuration, when the detection operation unit moves with the operation of the speed change lever and one end portion of the torsion spring is displaced due to long-term use, one end portion of the torsion spring extending in a cantilever shape is formed. It may be deformed in the direction of escape. That is, the spiral winding portion is not elastically deformed in the twisting direction, but is bent and deformed in the direction in which only one end of the torsional spring escapes. Similarly, at the other end of the torsion spring, the spiral winding portion may be bent and deformed without being elastically deformed in the twisting direction. As a result, there is a risk that sufficient movement urging to the detection operation unit cannot be performed.

Therefore, it has been desired to enable the movement urging of the detection operation unit by the torsion spring to be performed satisfactorily for a long period of time.

The characteristic configuration of the working machine according to the present invention is that the speed change device for running can be operated by being moved along the running speed change operation path, and the engine is operated from the running neutral position of the running speed change operation path. A shift lever that can be operated to the stop position, a detection operation unit that moves with the operation of the shift lever, and a position where the detection operation unit operates when the shift lever is operated to the engine stop position. It is provided with a detection sensor, a control means for stopping the engine based on the detection operation of the position detection sensor, and a torsion spring for moving and encouraging the detection operation unit toward an action position corresponding to the engine stop position. The torsion spring is provided with a first winding support portion wound around a shaft portion provided in the detection operation portion at one end, and provided at a fixed portion on the machine body side at the other end. A second winding support portion to be wound around the fixing pin is provided, and a spiral winding portion is provided between the one end portion and the other end portion.

According to the present invention, the first winding support portion provided at one end of the torsion spring is interlocked and linked in a state of being wound around the shaft portion of the detection operation portion. The second winding support portion provided at the other end of the torsion spring is wound around a fixing pin and supported by fixing the position. Since the other end of the torsion spring is supported in a fixed state, the detection operation unit linked to one end of the torsion spring is moved and urged toward the action position by the torsional force of the spiral winding portion. It is.

Since one end of the torsion spring is wound around the shaft of the detection operation unit, when the detection operation unit moves with the operation of the shift lever, only one end of the torsion spring bends and deforms in the escape direction. It always acts to properly elastically deform the spiral winding portion along the twisting direction. In other words, the spiral winding portion can maintain a twisting force against the detection operation portion for a long period of time.

As a result, it becomes possible to satisfactorily move and urge the detection operation unit by the torsion spring for a long period of time.

In the present invention, the detection operation unit is configured as a separate body from the shift lever, and moves between the action position and the standby position when the shift lever is in the traveling neutral position. The torsion spring is possibly supported, and when the detection operation unit is in the standby position, the torsion spring is moved and urged to move the detection operation unit from the action position toward the standby position side, and the detection operation unit is used for detection. When the operation unit is in the action position, it is preferable to move and urge the detection operation unit from the standby position toward the action position side.

According to this configuration, the speed change lever and the separate detection operation unit can move between the action position and the standby position according to the operation of the shift lever, and the urging direction of the torsion spring is the action position and the standby position. It switches in the opposite direction depending on the position. If the detection operation unit is prevented from moving further at the action position and the standby position, the position can be held at each of the action position and the standby position by the urging force of the torsion spring.

Therefore, with a simple configuration using one torsion spring, it is possible to hold the position of the detection operation unit at each of the action position and the standby position.

In the present invention, the first winding support portion is located on one end side of the spiral winding portion in the overlapping direction, and the second winding support portion is located on the other end side of the spiral winding portion in the overlapping direction. It is preferable that it is located in.

According to this configuration, the first winding support portion is formed in a state of being wound in the tangential direction as it is from the state of being wound at one end of the spiral winding portion, and at the other end of the spiral winding portion. The second winding support portion is formed in a state of being extended in the tangential direction as it is from the wound state. With this configuration, there is no need to bend between the spiral winding portion and the first winding support portion, or between the spiral winding portion and the second winding support portion. It has the advantage of being easy to manufacture.

In the present invention, it is preferable that the first winding support portion and the second winding support portion are provided at substantially the same position along the overlapping direction of the spiral winding portion.

According to this configuration, it is received and supported at the position corresponding to the first winding support portion, that is, the position where the return force is applied to the detection operation portion, and the position corresponding to the second winding support portion, that is, the fixing pin. The locations are substantially the same along the overlapping direction of the spiral winding portions. As a result, when the return urging force acts, there is little possibility that the force acts so that the spiral winding portion tilts, and the elastic deformation can be appropriately performed along the twisting direction.

It is an overall side view of a passenger-type rice transplanter. It is a top view of the front part of a passenger-type rice transplanter. It is a side view which shows the shift operation structure. It is a perspective view which shows the shift operation structure. It is a cross-sectional side view of the upper part of the control tower. It is a rear view of the upper part of the control part. It is a perspective view of an operation panel. It is a perspective view of the support bracket of the lower part of an operation panel. It is a perspective view which shows the support structure of each part under the operation panel. It is a rear view which shows the operation linkage structure of an accelerator lever. It is a side view which shows the operation linkage structure of an accelerator rail. It is a top view which shows the support structure of a rotation operation member. It is a side drawing which shows the support structure of a rotation operation member. It is a top view which shows the rotation operation member when it is in a standby position. It is a top view which shows the rotation operation member when it is in an action position. It is a control block diagram. It is a side view of the torsion spring of another embodiment.

Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the present invention is applied to a passenger-type rice transplanter, which is an example of a working machine, will be described with reference to the drawings.

Unless otherwise specified, the front-rear direction and the left-right direction in the present embodiment are described as follows. The traveling direction on the forward side (direction indicated by reference numeral F in FIGS. 1 and 2) is "forward", and the traveling direction on the backward side (direction indicated by reference numeral B in FIGS. 1 and 2) is the traveling direction of the aircraft during work traveling. "After". The direction corresponding to the right side (direction indicated by reference numeral R in FIG. 2) is “right” and the direction corresponding to the left side (direction indicated by reference numeral L in FIG. 2) is “right” with respect to the forward-facing posture in the front-back direction. Left ". Further, in FIG. 1, the direction indicated by the reference numeral U is “up”, and the direction indicated by the reference numeral D is “downward”.

〔overall structure〕
The overall configuration of a passenger-type rice transplanter will be described.
As shown in FIG. 1, the passenger-type rice transplanter is provided with a vertically swingable link mechanism 4 at the rear of a traveling vehicle body 3 supported by right and left front wheels 1 and right and left rear wheels 2. A four-row planting type seedling planting device 5 is supported up and down at the rear of the link mechanism 4, and a hydraulic cylinder 6 for raising and lowering the link mechanism 4 is provided.

A fertilizer application device 7 for supplying fertilizer to the rice field surface is provided at the rear of the traveling vehicle body 3, and a ground leveling device 8 for leveling the rice field surface is supported at the lower part on the front side of the seedling planting device 5. The seedling planting device 5 is provided with a planting transmission case 9, a rotating case 10, a planting arm 11, a float 12, a seedling stand 13, and the like. The rotary case 10 is rotatably supported on the right and left portions of the rear portion of the two planting transmission cases 9, and the planting arms 11 are supported on both ends of the rotary case 10. The seedling stand 13 is supported so as to be able to reciprocate in the left-right direction. As the seedling stand 13 is driven to reciprocate and laterally feed in the left-right direction, the rotary case 10 is rotationally driven, and the planting arms 11 alternately take out the seedlings from the lower part of the seedling stand 13 and plant them on the rice field surface.

As shown in FIG. 1, the fertilizer application device 7 is provided with a hopper 15, a feeding portion 16, a blower 17, a groove making device 18, a hose 19, and the like. That is, in the traveling vehicle body 3, a hopper 15 for storing fertilizer and a feeding portion 16 are supported on the rear side of the driver's seat 20, and a blower 17 is provided on the left lateral side of the feeding portion 16. A grooving device 18 is attached to the float 12, four grooving devices 18 are provided, and four hoses 19 are connected to the feeding portion 16 and the grooving device 18.

The fertilizer of the hopper 15 is fed out by the feeding portion 16 and is supplied to the groove making device 18 through the hose 19 by the transport air of the blower 17. Fertilizer is supplied from 18 to the ditch on the surface of the field. As shown in FIG. 1, the leveling device 8 is provided with a large number of rotatably supported ground leveling bodies 21, and the leveling body 21 is rotationally driven in the counterclockwise direction of FIG. Leveling is done.

An engine 22 is provided at the front of the traveling vehicle body 3. The power of the engine 22 is transmitted to the main transmission 24 including a hydrostatic continuously variable transmission as a transmission for traveling via the belt transmission mechanism 23. The power after shifting is transmitted to the front wheels 1 and the rear wheels 2 via a gear-type auxiliary transmission (not shown) and another gear-type transmission mechanism in the mission case 25, while the seedling planting device. It is also transmitted to 5 and the fertilizer application device 7.

[Driver]
As shown in FIG. 1, a driving unit 26 is provided at the front portion of the traveling vehicle body 3. The driver unit 26 is provided with a driver's seat 20, and a control tower 27 is provided in front of the driver's seat 20. An operation panel 28 provided with various operating tools and the like is provided on the upper part of the control tower 27, and a steering handle 29 is provided so as to project upward from the operation panel 28. As shown in FIG. 2, on the side of the handle post 30 that supports the control handle 29, an elevating operation lever 31 for instructing the elevating operation of the seedling planting device 5 in a state of being extended to the right side is provided. ing.

As shown in FIGS. 5 and 6, the operation panel 28 has an accelerator lever 32 for adjusting the output rotation speed of the engine 22, a main transmission lever 33 for shifting the main transmission 24, and an auxiliary transmission for shifting the auxiliary transmission. A lever 34 is provided. The accelerator lever 32 is provided on the right side of the handle post 30, and the main shift lever 33 and the auxiliary shift lever 34 are provided on the left side of the handle post 30.

The key switch 35 is provided on the right side of the accelerator lever 32 and on the right front side of the operation panel 28. When the key switch 35 is rotated from the stop position where the key is inserted, it switches to an operating position where electric power is supplied to each part, and when it is further rotated, it switches to a starting position where the engine 22 is started. .. When you release the key after starting the engine, it automatically returns to the operating position. By providing the key switch 35 on the right front side of the operation panel 28 in this way, there is little possibility that the driver's body touches and erroneously operates during the driving operation.

The operation panel 28 is provided with a timing adjustment dial 36 for adjusting the start timing when the automatic planting control is executed, and a headlight on / off switch 37. The automatic planting control will not be described in detail, but after the ridge approaches, the planting work is stopped, the seedling planting device 5 is raised and turned, and then the posture of the traveling vehicle body 3 is determined and the next time. The seedling planting device 5 is automatically lowered at the start position of the planting strip to start the seedling planting work, and the work start timing is changed according to the situation of the field.

As shown in FIGS. 5 and 6, the rear panel surface 38 is provided at a slightly lower position on the rear side of the operation panel 28. On the rear panel surface 38, a horizontal posture setting dial 39 for setting a target horizontal posture when executing horizontal control for automatically adjusting the left-right tilt posture of the seedling planting device 5 with respect to the traveling vehicle body 3 and a leveling device 8 are provided. A leveling height setting dial 40 for setting a target height of the leveling device 8 when executing automatic elevating control is provided.

Of the above dials, the timing adjustment dial 36 and the leveling height setting dial 40 are composed of a potentiometer with a built-in switch. When the dials 36 and 40 are rotated to the left to the limit, the switch is turned off, and the dials 36 and 40 have a function of turning off the control operation of the automatic planting control and the automatic elevating control when the switch is turned off. This reduces the number of parts.

As described above, the dial may be configured as follows instead of the configuration in which the switch is turned off when the dial is rotated to the left to the limit. For example, a switch unit that can be pushed and operated may be provided on the upper surface of the center portion of the dial so that the automatic control can be turned on and off while maintaining the set value of the dial as it is.

The support structure of the accelerator lever 32 will be described.
As shown in FIGS. 10 and 11, the accelerator lever 32 is supported by a support bracket 41 fixed to the lower side of the operation panel 28 so as to be swingable back and forth around the lateral axis P1. As shown in FIG. 9, the support bracket 41 has a front side wall portion 41a in a sideways posture at a front side portion of the operation panel 28, an upper right wall portion 41b extending rearward from the upper right side of the front side wall portion 41a, and a front side wall portion 41a. It is provided with a lower right wall portion 41c extending rearward from the lower right side of the vehicle, a left wall portion 41d extending rearward from the lower left side of the front side wall portion 41a, and the like.

As shown in FIGS. 10 and 11, the swing fulcrum portion 46 of the accelerator lever 32 is rotatably supported around the lateral axis P1 on the upper right wall portion 41b of the support bracket 41. The accelerator lever 32 is provided with an arm portion 47 extending from the swing fulcrum portion 46 to the front portion side, and is provided with a connecting pin 49 to which one end of the operation wire 48 is connected to the swing end portion of the arm portion 47. There is. The connecting pin 49 is provided in a state of inserting the insertion hole 50 formed in the upper right wall portion 41b. The insertion hole 50 is formed in an elongated hole so that the connecting pin 49 can move with the swing of the accelerator lever 32.

A wire support portion 51 extends from the upper end portion to the right on the lower right wall portion 41c of the support bracket 41. The outer wire holding portion 51a of the wire support portion 51 is provided so that the connection position of the connection pin 49 with the operation wire 48 and the position in the left-right direction are substantially the same. Further, the wire support portion 51 is formed in a backward tilted posture in a side view. As a result, the operation wire 48 is configured to be pulled in a substantially linear shape without bending as much as possible with the operation of the accelerator lever 32.

As shown in FIGS. ing. The base end of the auxiliary shift lever 34 is connected to the left end of the rotary support shaft 34a, and the interlocking operation mechanism 34b is interlocked with the auxiliary transmission at the right end of the rotary support shaft 34a.

[Main shift lever support structure]
As shown in FIGS. 3, 4 and 9, a fan-shaped speed change member 52 is provided at a position corresponding to the lower part of the main speed change lever 33 in a side view in which a large number of recesses 52a are formed on the upper side portion. The boss portion 52b of the speed change member 52 is rotatably supported around the axis P2 of the fulcrum shaft 53 in the lateral posture provided on the left wall portion 41d of the support bracket 41 in a fixed state.

The lower portion of the main speed change lever 33 is swingably supported by the shaft support portion 52c of the speed change member 52 around the shaft core P3 along the front-rear direction. As shown in FIGS. 3 and 4, a spring 54 is provided between the arm portion 33a connected to the lower part of the main speed change lever 33 and the speed change member 52, and the main speed change lever 33 has a weak spring 54. It is urged to the control handle 29 side by the force. The main speed change lever 33 is operably supported around the lateral axis P2 together with the speed change member 52 in the front-rear direction, and is operably supported around the front-rear axis P3 with respect to the speed change member 52. ..

As shown in FIG. 6, the main speed change lever 33 is inserted in the vertical direction and a guide hole 55 that allows movement in the front-rear direction and the left-right direction is opened in the left lateral portion of the control handle 29 in the operation panel 28. It is formed. As shown in FIG. 14, in the guide hole 55, a neutral path 56 arranged along the left-right direction is formed in the middle portion in the front-rear direction, and the guide hole 55 is on the front side from the forward neutral position 56a which is one end of the neutral path 56. The forward path 57 is extended to the rear, and the reverse path 58 is extended to the rear from the reverse neutral position 56b, which is the other end of the neutral path 56. The forward path 57, the neutral path 56, and the reverse path 58 are provided in a series of continuous states, and a traveling speed change operation path is formed by these. Forward neutral position 56a Corresponds to the running neutral position.

Since the main speed change lever 33 is operably supported by the speed change member 52 in the front-rear direction and the left-right direction, the main speed change lever 33 can be artificially operated along the forward path 57, the neutral path 56, and the reverse path 58. be.

As shown in FIGS. It is engaged with any of the plurality of recesses 52a. In the forward path 57 and the reverse path 58, the roller 60 of the holding member 59 engages with any recess 52a of the speed change member 52, so that the main shift lever 33 is placed at a desired position of the forward path 57 and the reverse path 58. Be retained.

[Linked structure between the main shift lever and the transmission for traveling]
As shown in FIGS. 3 and 4, an angle-shaped relay member 62 is provided at the lower part of the handle post 30 in a state of being rotatably supported by a support shaft 61 provided along the left-right direction. ing. The arm portion 52d connected to the boss portion 52b of the speed change member 52 and one end of the relay member 62 are interlocked and linked via the vertical linking rod 63. The arm portion 24b is connected to the shift shaft 24a of the main transmission 24, and the lateral linking rod 64 is connected to the other end of the relay member 62 and the arm portion 24b of the transmission 24.

When the main shift lever 33 swings back and forth around the lateral axis P2, the relay member 62 swings via the vertical link rod 63, and the arm portion 24b of the transmission 24 is operated via the horizontal link rod 64. The shift operation is performed. When the main speed change lever 33 is operated forward along the forward path 57 from the forward neutral position 56a of the neutral path 56, the main speed change device 24 is steplessly increased in speed to the forward side. When the main shift lever 33 is operated from the reverse neutral position 56b of the neutral path 56 to the reverse path 58, the speed is steplessly increased to the reverse side.

[Structure related to engine stop operation by main shift lever]
As shown in FIG. 12, in the guide hole 55 of the operation panel 28, a stop position 65 is provided at a position adjacent to the forward neutral position 56a of the neutral path 56 on the opposite side of the neutral path 56. On the lower side of the stop position 65 on the operation panel 28, a rotation operation member 66 as a detection operation unit made of a plate material is provided.

As shown in FIGS. 12 to 14, the rotation operation member 66 is supported by a support shaft 67 protruding downward from the operation panel 28 so as to be swingably movable around the vertical axis P4. The rotation operation member 66 swings around the vertical axis P4 to correspond to the standby position A1 when the main shift lever 33 is in the neutral position and when the main shift lever 33 is in the stop position 65. It is movably supported to and from the corresponding action position A2.

The rotation operation member 66 is provided with a boundary portion 66a, an arm portion 66b, a concave holding portion 66c between the boundary portion 66a and the arm portion 66b, and two contact portions 66d and 66e. A torsion spring 68 that functions as a toggle spring is attached to the operation panel 28 and the contact portion 66d of the rotation operation member 66.

As shown in FIG. 14, when the rotation operation member 66 is in the standby position A1, the boundary portion 66a protrudes into the guide hole 55 so as to close the opening corresponding to the stop position 65 of the guide hole 55. Further, in this state, the end surface of the boundary portion 66a is in a state of being connected to the right inner edge of the forward path 57 in the front-rear direction. Therefore, when the main speed change lever 33 is operated to the forward neutral position 56a along the forward path 57, the rotation operation member 66 does not become a resistance to the movement of the main speed change lever 33 and guides smoothly. Can be done.

The torsion spring 68 is provided with a first winding support portion 68a wound around a shaft portion 69 provided on the rotation operation member 66 at one end, and is operated as a fixing portion on the machine body side at the other end. A second winding support portion 68b wound around a fixing pin 70 provided on the panel 28 is provided, and a spiral winding portion 68c is provided between one end portion and the other end portion. The first winding support portion 68a and the second winding support portion 68b are in a state of being displaced in the overlapping direction Q of the spiral winding portion 68c. That is, the first winding support portion 68a is located on one end side of the overlapping direction Q in the spiral winding portion 68c, and the second winding support portion 68b is located on the other end side of the spiral winding portion 68c in the overlapping direction. is doing.

When the rotation operation member 66 is in the standby position A1, the torsion spring 68 moves and urges the rotation operation member 66 from the action position A2 toward the standby position A1 side, and the rotation operation member 66 is in the action position. When it is in A2, the rotation operation member 66 is moved and urged from the standby position A1 toward the action position A2.

As shown in FIG. 14, the position of the shaft portion 69 of the rotation operating member 66 is from the dead point position X located on the line connecting the vertical axis P4 and the fixing pin 70 in a plan view. In the state of being rotated counterclockwise, the shaft portion 69 is rotationally urged in the counterclockwise direction by the urging force of the torsion spring 68. The contact portion 66d of the rotation operation member 66 hits the left wall portion 41d of the support bracket 41 to regulate the position, and the rotation operation member 66 is held at the standby position A1.

As shown in FIG. 15, in a plan view, when the position of the shaft portion 69 of the rotation operating member 66 is rotated clockwise from the dead point position X, the shaft portion 69 is clocked by the urging force of the torsion spring 68. It is urged to rotate in the direction. The contact portion 66e of the rotation operation member 66 hits the left wall portion 41d of the support bracket 41, and the rotation operation member 66 is held at the action position A2.

Although the description is omitted in FIG. 15, a limit switch type position detection sensor 71 for detecting that the rotation operation member 66 has switched from the standby position A1 to the action position A2 is provided in the vicinity of the rotation operation member 66. It is provided. Further, as shown in FIG. 16, in addition to the position detection sensor 71, a brake switch 73 for detecting that the brake pedal 72 has been depressed is provided, and the detection signals of the position detection sensor 71 and the brake switch 73 are provided. Is input to the control device 74. Further, an engine control unit 75 (fuel injection device, starter, etc.) for starting and stopping the engine 22 is provided, and the control device 74 is an engine based on the detection signals of the position detection sensor 71 and the brake switch 73. The control unit 75 is operated.

(Engine stop operation by main shift lever)
When stopping the engine 22, the operator operates the main speed change lever 33 from the neutral path 56 to the stop position 65 side, puts the main speed change lever 33 on the boundary portion 66a of the rotation operation member 66, and twists the spring. The main shift lever 33 is operated to the stop position 65 side with an operating force larger than a predetermined value that overcomes the urging force of 68.

As a result, the rotation operation member 66 swings from the standby position A1 to the action position A2 with the operation of the main shift lever 33, and the movement of the main shift lever 33 from the neutral path 56 to the stop position 65 is performed. Permissible. When the rotation operation member 66 is switched to the action position A2, the rotation operation member 66 is held at the action position A2 by the urging force of the torsion spring 68, and the main speed change lever 33 is received by the arm portion 66b of the rotation operation member 66. It is stopped and held at the stop position 65.

When the position detection sensor 71 detects that the rotation operation member 66 has been operated to the action position A2, the engine control unit 75 is operated and the engine 22 is stopped. Next, when starting the engine 22, the operator operates the main shift lever 33 from the stop position 65 to the neutral path 56 side, and puts the main shift lever 33 on the arm portion 66b of the rotation operation member 66. When the rotation operation member 66 is operated to the neutral path 56 side with an operation force larger than a predetermined value that overcomes the urging force of the torsion spring 84, the rotation operation member 66 is operated to the standby position A1.

At this time, even if the rotation operation member 66 is operated to the standby position A1, the engine 22 is not started. When the brake pedal 72 is stepped on after the rotation operation member 66 is operated to the standby position A1, the engine control unit 75 is operated based on the detection signal of the brake switch 73, and the engine 22 is started. To.

[Another Embodiment]
(1) In the above embodiment, the one end portion and the other end portion of the torsion spring 68 are provided in a state where the positions are different along the overlapping direction of the spiral winding portion 68c. Instead, as shown in FIG. 17, the first winding support portion 68a and the second winding support portion 68b may be provided at substantially the same position along the overlapping direction Q of the spiral winding portion 68c. good. In this configuration, when the return urging force acts, the force does not act so that the spiral winding portion 68c is inclined with respect to the overlapping direction, and the spiral winding portion 68c can be appropriately elastically deformed along the twisting direction. ..

(2) In the above embodiment, the torsion spring 68 is configured to overcome the dead point, and when the rotation operation member 66 is in the standby position A1, the torsion spring 68 is moved and urged from the action position A2 toward the standby position A1. However, when the rotation operation member 66 is in the action position A2, the structure is such that the rotation operation member 66 is moved and urged from the standby position A1 toward the action position A2. The configuration is such that the movement is always urged from the standby position A1 toward the action position A2, and when the main shift lever 33 moves from the running neutral position to the stop position and when moving from the stop position to the running neutral position, It may be configured to include a resistance applying means (for example, a spring plate or the like) that imparts resistance to movement.

(3) In the above embodiment, the rotation operation member 66 is provided separately from the main speed change lever 33, but instead of this configuration, the rotation operation member 66 is integrally provided with the main speed change lever 33. It may be configured to be provided in a continuous state.

The present invention can be applied to various working machines such as tractors and harvesters, in addition to passenger-type rice transplanters.

22 Engine 24 Transmission 28 Fixed part 33 Shift lever 56a Running neutral position
65 Engine stop position 66 Rotation operation member (detection operation unit)
68 Twisting spring 68a 1st winding support 68b 2nd winding support 68c Spiral winding 70 Fixed pin 71 Position detection sensor 74 Control means A1 Standby position A2 Action position Q Overlapping direction

Claims (4)

A speed change lever that can operate the speed change device for travel by moving along the travel speed change operation path and can be operated from the travel neutral position to the engine stop position of the travel speed change operation path.
A detection operation unit that moves with the operation of the shift lever,
A position detection sensor on which the detection operation unit operates as the shift lever is operated to the engine stop position, and
A control means for stopping the engine based on the detection operation of the position detection sensor,
A torsion spring is provided to move and urge the detection operation unit toward the action position corresponding to the engine stop position.
The torsion spring is provided with a first winding support portion wound around a shaft portion provided in the detection operation portion at one end, and a fixing provided at a fixing portion on the machine body side at the other end. A working machine provided with a second winding support portion wound around a pin and a spiral winding portion between the one end portion and the other end portion. The detection operation unit is configured as a separate body from the shift lever, and is movably supported between the action position and the standby position when the shift lever is in the traveling neutral position.
When the detection operation unit is in the standby position, the torsion spring moves and urges the detection operation unit from the action position toward the standby position side, and the detection operation unit acts. The working machine according to claim 1, wherein when it is in a position, the detection operation unit is moved and urged so as to move from the standby position toward the working position side. The first winding support portion is located on one end side in the overlapping direction in the spiral winding portion, and the second winding support portion is located on the other end side in the overlapping direction in the spiral winding portion. The working machine according to claim 1 or 2. The working machine according to claim 1 or 2, wherein the first winding support portion and the second winding support portion are provided at substantially the same position along the overlapping direction of the spiral winding portion.

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