JP2006170067A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine in which an engine speed governor 31 governs speed of an engine in cooperation with the transmission operation of a traveling transmission capable of changing the engine speed corresponding to the transmission state of the traveling transmission. <P>SOLUTION: The working machine is provided with a transmission lever 33 of the traveling transmission, and an adjusting means 70 provided to an operation cable 63 of a cooperation mechanism 60 for making the engine speed governor 31 and an operation arm 31a to cooperate with each other. The adjusting means 70 transfers and adjusts the end of an outer cable 63b of the operation cable 63, and operates the cooperation mechanism 60 so that the transmission state of the engine governor 31 corresponding to the operated transmission state of the traveling transmission device changes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, the engine speed governor operates to increase the speed in association with the upshifting operation of the traveling transmission, and the operation is performed in conjunction with the downshifting operation of the traveling transmission. The present invention relates to a working machine provided with a linkage mechanism that links the travel transmission device and the engine speed control device so that the engine speed control device operates to reduce the speed.

  When the speed change operation is performed on the traveling transmission, the working machine automatically adjusts the speed of the engine to change the engine speed, so that the engine runs at a speed while adjusting the engine output without any special accelerator adjustment. It is something that can be done.

  Conventionally, as this type of work machine, for example, as disclosed in Patent Document 1, a continuously variable transmission 21 (corresponding to a traveling transmission) and a speed governor 32 that adjusts the engine speed are provided. 21. A speed control means (which is connected to the linkage mechanism) includes a speed change sensor 40 for detecting the speed change state 21 and speed control control means 41 for controlling the speed control device 32 based on the detection results of the speed change sensor 40 and the reverse sensor 36. There was a thing equipped with.

JP 2004-114848 A (paragraphs [0040], [0043], [0044], FIGS. 2, 3 and 4)

For example, in a riding type rice transplanter as an example of a working machine, a linkage in which a traveling transmission and an engine governor are linked so that the engine governor automatically adjusts when a shifting operation is performed on the traveling transmission. If the mechanism is provided, if the speed change operation is performed on the travel transmission, it is possible to work while changing speed while adjusting the engine output without performing special accelerator adjustment.
In the case of a riding type rice transplanter, a self-propelled vehicle may be loaded on the platform board mounted on the carrier's carrier, or the kite may be moved over by moving itself. In this case, the travel transmission is operated to a low speed shift state so that the airframe moves on the step board or over the saddle at a low speed. At this time, the linkage mechanism of the travel transmission and the engine speed governor is used. If a low engine speed appears due to the linkage, engine output may be insufficient, and it may be difficult to climb the walking board or kite.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a working machine that can travel at a speed while producing an appropriate engine output only by shifting a traveling transmission device during operation and when moving.

In the first aspect of the invention, the engine speed governor operates to increase the speed in association with the upshifting operation of the traveling transmission, and the downshifting operation of the traveling transmission is performed. In the working machine having a linkage mechanism that links the travel transmission device and the engine speed control device so that the engine speed control device operates in a speed-reducing manner in conjunction with
Adjustment means for operating the linkage mechanism is provided so that a speed state of the engine speed control device corresponding to a speed change state in which the travel transmission device is changed.

  That is, when the adjusting mechanism is adjusted by the adjusting means, the speed state of the engine speed control device corresponding to the shift state of the traveling transmission changes, so that the adjusting mechanism is adjusted before the adjusting mechanism is adjusted by the adjusting means. After the operation, the engine speed that appears when the engine speed governor automatically performs speed control as the travel transmission is shifted to a desired speed change state is different. As a result, if the adjusting mechanism is adjusted to a state suitable for work travel by the adjusting means, the engine speed governor automatically performs the speed control operation as the travel speed change operation is performed, and the speed change state of the travel speed change device. The engine speed corresponding to the engine speed appears, and this engine speed is suitable for work traveling at a low speed for the speed change state even if the travel transmission is in a high speed shift state. The engine speed can be displayed. If the adjustment mechanism is operated to adjust the linkage mechanism to a state suitable for moving travel, the engine speed governor automatically adjusts the speed corresponding to the speed change state of the travel transmission as the speed change operation is performed on the travel transmission. The engine speed appears, and the engine speed is suitable for traveling at high speeds even if the travel transmission is in a low-speed shift state. Can appear.

  Therefore, according to the first aspect of the present invention, by appropriately adjusting the linkage mechanism by the adjusting means, the engine adjusting device adjusts itself by shifting the travel transmission device during both the work travel and the traveling travel. It can be operated at high speed and the speed change operation of the travel transmission can be performed simply by adjusting the engine output, and the engine speed can be adjusted to an excessively high speed during work travel. It is possible to travel more advantageously in terms of fuel economy, etc., and when traveling, even if the engine speed is high for low speed traveling, even if it is on the step board or over the fence It is possible to run lightly with the engine output without any shortage.

  In the second aspect of the invention, in the configuration of the first aspect of the invention, the adjusting means is provided with an operation state in which the linkage mechanism is operated to the linkage release state, and the engine speed governor is operated alone. An accelerator operating tool linked to the engine speed control device is provided.

  That is, the engine speed control device can be operated independently regardless of the travel transmission device by operating the accelerator operating tool by operating the linkage mechanism to the linkage released state by the adjusting means.

  Therefore, according to the second aspect of the present invention, if the climbing angle is steep and it is difficult to climb even if the linkage mechanism is adjusted for traveling, the engine speed control device is operated alone to increase the engine output. It is possible to travel advantageously by adjusting the rotational speed to the increase side or the decrease side separately from the travel transmission.

  In the third aspect of the invention, in the configuration of the first or second aspect of the invention, the linkage mechanism includes an operation cable that links the travel transmission device and the engine speed governor, and the adjusting means includes: The linkage mechanism is operated by operating the outer cable of the operation cable.

  That is, the outer cable of the operation cable is moved and adjusted by the adjusting means, whereby the linkage mechanism is operated so that the speed state of the engine speed control device corresponding to the speed change state of the traveling transmission device is changed.

  Therefore, according to the third aspect of the present invention, a simple adjustment means that only moves and adjusts the outer cable can be used to advantageously travel by appropriately adjusting the engine speed both during work travel and during travel travel. Can be obtained inexpensively.

  According to the fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the driving mechanism includes a positioning mechanism that positions the speed change lever that shifts the travel speed change device, The shift release device is operated to release the positioning mechanism and to return the shift lever to a neutral position.

  That is, when the travel brake is turned on, even if the travel transmission is in the transmission state, the shift release device operates to release the shift lever positioning mechanism and return the shift lever to the neutral position. The transmission device is in a neutral state.

  Therefore, according to the fourth aspect of the present invention, when the traveling brake is turned on, the traveling transmission device is switched to the neutral state by the shift release device, and the traveling is performed without taking the trouble of switching the traveling transmission device to the neutral state. The transmission to the device can be cut off and the brake can be effectively operated.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a pair of left and right front wheels 1 that can be driven and steered, a pair of left and right rear wheels 2 that can be driven, a motor equipped with an engine 3 located at the front of the vehicle body, and a position at the rear of the vehicle body A link mechanism 8 provided with a lift cylinder 7 at the rear part of a body frame 6 of a self-propelled vehicle body provided with a drive seedling device 5 provided on both sides of a driving part and a driving part equipped with a driving seat 4 Is connected to the seedling planting apparatus 10 via the rotary shaft 9 and is transmitted to the seedling planting apparatus 10 via the rotary shaft 9. A fertilizer application device 20 equipped with a fertilizer tank 21 is provided on the side to constitute a riding type rice transplanter with a fertilizer application device.

  This rice transplanter is for planting rice seedlings and fertilizing the planted seedlings. When the lift cylinder 7 is operated, the lift cylinder 7 swings the link mechanism 8 up and down with respect to the vehicle body frame 6. Then, the seedling planting device 10 is moved up and down into a descending working state in which the leveling float 11 is grounded and a rising non-working state in which the leveling float 11 is raised from the ground. When the seedling planting device 10 is moved down and the self-propelled vehicle is driven, the seedling planting device 10 uses a plurality of seedling planting mechanisms 12 arranged in the lateral direction of the planting machine at the rear of the planting machine body to plant seedlings of the seedling planting mechanism 12. A place where a block of seedlings is cut and taken out from the mat-like seedling placed on the seedling stand 13 that is reciprocated in the horizontal direction of the planting machine in conjunction with the movement, and is leveled by the leveling float 11 in the field scene It is transported down and planted. The fertilizer application device 20 delivers the fertilizer from the fertilizer tank 21 by the feeding device 22 connected to the lower part of the fertilizer tank 21, and the fertilizer from the feeding device 22 is transferred from the feeding device 22 to the seedling planting device 10 by the conveying air from the electric blower 23. It supplies to the several fertilization hose 24 extended. A plurality of fertilizer hoses 24 are arranged to correspond to one seedling planting mechanism 12 one by one and communicate with a plurality of grooving fertilizers 25 supported by the leveling float 11, respectively. The fertilizer applicator 25 forms a groove in the field near the side of the seedling planted by the seedling planting mechanism 12 and supplies fertilizer from the fertilizer hose 24 to the groove. Thereby, the fertilizer application apparatus 20 supplies a fertilizer near the side of the multiple seedling planted seedling by the seedling planting apparatus 10 as the seedling planting apparatus 10 performs seedling planting.

  A traveling transmission device 30 is provided behind the engine 3 of the self-propelled vehicle body, and the driving force of the engine 3 is transmitted to the front and rear wheels 1 and 2 via the traveling transmission device 30. The traveling transmission device 30 is driven by an axial plunger type variable displacement hydraulic pump (not shown) driven by the driving force from the engine 3 and the front and rear wheels 1, 2 driven by the pressure oil from the hydraulic pump. And a hydrostatic continuously variable transmission that includes an axial plunger type hydraulic motor (not shown).

  An engine speed control device 31 (see FIG. 4) for changing and adjusting the rotational speed of the engine 3 is provided in the driving portion, and the engine speed control device 31 and the travel transmission device 30 are provided with a steering wheel 32 of a driving portion. Is operated by an operating device provided with a shift lever 33 provided near the side of the lever and a lever-type accelerator operating tool 34 (see FIGS. 2 and 4). As shown in FIG.

  That is, the mounting base portion 36 b of the lever support 36, which is rotatably connected to the support portion 36 a via the connecting shaft 35, is supported by the steering device 37 fixed to the vehicle body frame 6. The shift lever 33 swings in the longitudinal direction of the vehicle body about the lateral axis of the vehicle body of the support shaft 38 and moves laterally around the axis of the connection shaft 35 in the vehicle body direction. A lever guide 41 as shown in FIG. 5, which is supported so as to swing and is fixed to the handle post 39 via a bracket 40, extends around the axis of the support shaft 38 in the longitudinal direction of the vehicle body. It is designed to swing.

  The lever support 36, an interlocking rod 45 having one end connected to the mounting base 36b of the lever support 36, the other end of the interlocking rod 45 is connected to the free end via a spherical joint 46, and the base travels. The transmission lever 33 and the transmission shaft 30a of the travel transmission 30 are provided by an interlocking mechanism including a transmission arm 47 that is connected to a transmission shaft 30a that is a swash plate operation shaft of a hydraulic pump of the transmission 30 for rotation. And are linked.

  As shown in FIG. 3 and the like, a positioning mechanism 50 having a plurality of positioning recesses 51 arranged side by side in the longitudinal direction of the vehicle body on the lateral side edge of the guide groove 42 of the lever guide 41, and the lever guide 41 The speed change lever 33 is provided with a sensing mechanism 55 having a sound output recess 56 formed of a plurality of through holes arranged in the longitudinal direction of the vehicle body on the lateral side of the guide groove 42.

  As shown in FIGS. 3 and 5, the positioning mechanism 50 includes the plurality of positioning recesses 51 and a lever protrusion 52 provided between the grip portion of the speed change lever 33 and the mounting base portion 36b.

  When the speed change lever 33 is operated to the neutral position N located at the intermediate portion of the guide groove 42, the lever protrusion 52 is urged to swing the speed change lever 33 by the engagement spring 53 provided on the mounting base 33a of the speed change lever 33. For this reason, when the shift lever 33 is operated to the forward travel region F located in front of the neutral position N of the guide groove 42, the positioning recess 51 corresponding to the neutral position N among the plurality of positioning recesses 51 is entered. The lever protrusion 52 enters the forward positioning recess 51 corresponding to the operation position of the speed change lever 33 in the positioning recess 51 due to the engagement spring 53, and the speed change lever 33 is moved from the neutral position N of the guide groove 42. When the lever projection 52 is operated to the reverse region R located on the rear side, the lever protrusion 52 is provided with the shift lever 33 of the plurality of positioning recesses 51 for the engagement spring 53. So that the enter to the reverse side of the positioning recess 51 corresponding to the work position.

  As a result, when the shift lever 33 is operated to the operation positions of the neutral position N, the forward range F, and the reverse range R, the positioning mechanism 50 causes the shift lever 33 and the lever guide 41 to be moved by the lever protrusion 52 entering the positioning recess 51. Is engaged to position the transmission lever 33 at the operating position. When the shift lever 33 is swung against the engagement spring 53, the lever protrusion 52 is detached from the positioning recess 51, so that the positioning mechanism 50 swings along the guide groove 42 of the shift lever 33. The positioning is released to allow the moving operation.

  As shown in FIGS. 3 and 5, the sensing mechanism 55 is supported by a sound output recess 56 formed of the plurality of through holes and a support portion 36 c located near the lower surface of the lever guide 41 of the lever support 36. The sound output pin 57 is provided.

  The sound output pin 57 is slidably supported by the support portion 36 c of the lever support 36 and is slidably biased by a sensing spring 58 fitted on the sound output pin 57 to be on the lower surface side of the lever guide 41. When the speed change lever 33 is swung along the guide groove 42, the sound output pin 57 is swung together with the speed change lever 33 by the lever support 36 and the lower surface side of the lever guide 41. At this time, the sound output pin 57 is moved and operated for the sensing spring 58 while repeatedly engaging and disengaging the sound output recess 56.

  Thus, when the speed change lever 33 is swung along the guide groove 42, the sensing mechanism 55 gives a click feeling by repeatedly engaging and disengaging the sound output pin 57 with respect to the sound output recess 56.

  As shown in FIG. 4, the shift lever 33 is linked to the engine speed control device 31 by a linkage mechanism 60 including a pair of sensing links 61 and 62 provided on the upper surface side of the lever guide 41.

  As shown in FIGS. 4 and 5, the linkage mechanism 60 includes an inner cable 63 a having one end connected to the pair of sensing links 61, 62 and one of the pair of sensing links 61, 62. The operation cable 63 having the above is provided.

  As clearly shown in FIG. 5, the one forward sensing link 61 of the pair of sensing links 61, 62 swings around the axis of the connecting pin 64 disposed on the rear end side of the forward sensing link 61. As described above, the lever guide 41 is supported via a connection pin 64, and the other reverse movement detection link 62 swings around the axis of the connection pin 65 disposed on the front end side of the reverse movement detection link 62. The guide 41 is supported via a connecting pin 65. The forward movement detection link 61 is provided with an interlocking pin 67 configured to be slidably inserted into a long hole 66 provided at a position slightly away from the connection pin 65 of the reverse movement detection link 62. And the reverse movement detection link 62 are interlocked. As shown in FIG. 4, the end of the operation cable 63 opposite to the side connected to the forward movement detection link 61 of the inner cable 63 a is connected to the operation arm 31 a of the engine speed control device 31.

  4 and 5, when the shift lever 33 is operated to the neutral position N, the return spring 66 acting on the operation arm 31a of the engine speed governor 31 is shown. Because of the pulling operation of the inner cable 63a by the link and the interlocking of the two sensing links 61, 62 by the interlocking pin 67, the forward sensing link 61 and the backward sensing link 62 are arranged at the middle of the sensing links 61, 62 at the speed change lever 33. And the operation arm 31a of the engine governor 31 is in the low-speed operation state.

  As shown in FIG. 7 (a), when the speed change lever 33 is operated to the forward travel area F so that the speed change lever 33 is in the forward travel area F, the speed change lever 33 is more idle than the intermediate portion of the forward movement detection link 61. The forward movement detection link 61 is swung in the rocking direction U by the shift lever 33 by abutting the sensing portion 61a located on the side, and the operation cable 63 is pulled to move the operation arm 31a of the engine governor 31 to the high speed side. Swing operation.

  As shown in FIG. 7B, when the shift lever 33 is operated to the reverse range R, the shift lever 33 is more loose than the intermediate portion of the reverse detection link 62 when the shift lever 33 is operated to the reverse range R. The reverse movement detection link 62 is swung in the rocking direction U by the shift lever 33 in contact with the sensing portion 62a located on the side, and the forward movement detection link 61 is rocked in the rocking direction U via the interlocking pin 67. When the operation cable 63 is pulled, the operation arm 31a of the engine governor 31 is swung to the high speed side.

  Regardless of whether the shift lever 33 is operated in the forward range F or the reverse range R, the forward detection link 61 or the reverse detection link 62 increases as the operation stroke from the neutral position N of the shift lever 33 is increased. And the operation stroke of the operation cable 63 is increased, and the operation arm 31a of the engine speed governor 31 is operated to swing to a higher speed side.

  Thus, the linkage mechanism 60 links the travel transmission device 30 and the engine speed control device 31 as follows by associating the speed change lever 33 and the engine speed control device 31. That is, when the speed change device 30 is operated to shift up in both the forward side and the reverse side, the engine speed governor 31 operates in a speed-up manner in conjunction with this, and the speed change gear When the gear shift operation is performed in the direction in which the device 30 shifts down on both the forward side and the reverse side, the engine speed control device 31 is linked so as to perform the speed control operation on the deceleration side.

  As shown in FIG. 4, the operating cable 63 of the linkage mechanism 60 is provided with adjusting means 70 comprising an adjusting lever provided near the handle post 39 of the operating section as shown in FIG.

  As shown in FIGS. 3 and 5, the base of the adjusting means 70 is rotatably supported by a support member 71 fixed to the handle post 39 via a connecting shaft 72. It swings around the axis. In the middle of the adjusting means 70, an outer holder 73 and a positioning piece 74 for holding the end of the outer cable 63b of the operation cable 63 are provided.

  The adjusting means 70 is elastically deformed so that the connecting shaft 72 serves as a swing fulcrum, whereby the positioning piece 74 is detached from the positioning recesses 75, 75 a to 75 c of the bracket 40, and the adjusting means 70 is connected to the connecting shaft 72. The swinging operation can be performed around the shaft core, and the positioning piece 74 enters the positioning recesses 75, 75a to 75c, whereby the adjusting means 70 is engaged with the bracket 40 and held in the operating state. When the adjusting means 70 is swung so that the positioning piece 74 is operated in one of the positioning recesses 75 and 75a to 75c, the end of the outer cable 63b moves forward. The linkage mechanism 6 is moved and adjusted in a direction approaching the sensing link 61 and away from the forward sensing link 61 and is fixed at the adjustment position. Travel gear device 30 and the linkage mechanism 60 as rotation states of the engine speed governor 31 is changed due to is adjusted.

  That is, when the adjusting means 70 is operated to the operation state C for work in which the positioning piece 74 enters the positioning recess 75c, the linkage mechanism 60 causes the engine speed to increase as the travel transmission device 30 is operated to change speed. The operation is adjusted to a working linkage state in which the traveling speed change device 30 and the engine speed control device 31 are linked so that the engine speed control device 31 operates in a speed changing state along the work speed change line c in FIG. The

  When the adjusting means 70 is operated to the first operation state B for movement in which the positioning piece 74 has entered the positioning recess 75b, the linkage mechanism 60 causes the engine speed to increase as the travel transmission 30 is shifted. First moving state in which the traveling speed change device 30 and the engine speed control device 31 are linked so that the engine speed control device 31 operates in a state that changes along the moving first speed change line b in FIG. Adjusted to That is, in the linkage mechanism 60, the speed state of the engine speed governor 31 corresponding to the speed state in which the traveling transmission device 30 is shifted is adjusted more than that when the linkage mechanism 60 is adjusted to the work linkage state. The traveling transmission device 30 and the engine speed control device 31 are linked so as to achieve a high speed state.

  When the adjusting means 70 is operated to the second operation state A for movement in which the positioning piece 74 enters the positioning recess 75a, the operation cable 63 is loosened, and the linkage mechanism 60 causes the travel transmission 30 to shift. The traveling transmission device 30 and the engine speed control device 31 are controlled so that the engine speed control device 31 operates in such a manner that the engine speed changes along the second shift line a for movement in FIG. Is adjusted to the second linkage state for movement linked to each other. That is, the continuous writing mechanism 60 is the same as that when the speed state of the engine governor 31 corresponding to the speed state at which the traveling transmission device 30 is shifted is adjusted to the second linkage state for movement. In other words, the traveling transmission device 30 and the engine speed control device 31 are linked so as to achieve a higher speed state.

  When the adjusting means 70 is operated to turn OFF the third operating state for movement in which the positioning piece 74 enters the positioning recess 75, the linkage mechanism 60 causes the engine speed adjusting device 31 to operate even if the traveling speed change device 30 is changed. The adjustment operation is performed so that the link between the traveling transmission device 30 and the engine speed control device 31 is released so that the speed control operation is not performed.

  The accelerator operating tool 34 is supported in a swingable manner, and is linked to the operating arm 31a of the engine governor 31 via an operating cable 76 having an inner cable connected to one end of the base of the accelerator operating tool 34. The engine speed adjusting device 31 is adjusted to the speed increasing side or the speed reducing side by the swing operation of the accelerator operating tool 34.

  By causing the friction mechanism 77 to act on the base of the accelerator operation tool 34 and holding the accelerator operation tool 34 at an arbitrary operation position by friction braking by the friction mechanism 77, the engine speed control device 31 is brought to the operation position of the accelerator operation tool 34. The corresponding speed state is held against the return spring 66.

That is, when the shift lever 33 is swung in the longitudinal direction of the vehicle body along the guide groove 42 and operated in the forward range F, the traveling transmission device 30 is moved forward to apply forward drive force to the front and rear wheels 1 and 2. The vehicle body travels forward. When the shift lever 33 is operated in the reverse range R, the traveling transmission 30 is in the reverse state, the reverse drive force is transmitted to the front and rear wheels 1 and 2, and the vehicle body travels backward.
At this time, the adjusting means 70 is operated to the operation state C at the time of work. Then, the linkage mechanism 60 is in the working linkage state, and the traveling speed change device 30 and the engine speed control device 31 are linked to each other. The speed-regulating operation changes the engine speed along the work shift line c, and the vehicle can travel while changing the engine output.
In addition, when the vehicle body is moved on the platform by self-propelling by using the walking board or moved over the ridge by self-propelling, the adjusting means 70 is operated to the operation state A or B. Then, the linkage mechanism 60 enters the first linkage state for movement or the second linkage state for movement, and the running transmission 30 and the engine governor 31 are linked to each other, so that only the shifting operation of the running transmission 30 is performed. Thus, the engine speed adjusting device 31 naturally performs the speed adjusting operation so that the engine speed changes along the first shift line b for movement and the second shift line a for movement, and the vehicle can travel while changing the engine output. . At this time, the travel transmission 30 is shifted to a low speed shift state to travel, but compared with the case where the adjusting means 70 is operated to the work operation state C, the travel speed is higher than the travel speed. In this speed state, the engine speed control device 31 performs the speed control operation, the high engine speed is displayed, and the vehicle can travel while exhibiting high engine output. In addition, the engine governor 31 operates in a higher speed state when the adjusting means 70 is operated in the second operation state A than in the first operation state B for movement. It is possible to run while demonstrating higher engine output.

  If there is a shortage in engine output even when the adjusting means 70 is operated to the operation state A or B for movement, the adjusting means 70 is operated to the third operation state OFF for movement. Then, the linkage mechanism 60 is released from the linkage state, and the linkage between the travel transmission device 30 and the engine speed control device 31 is released, so that the accelerator operation tool 34 causes the engine speed control device 31 to be connected to the travel transmission device 30. Regardless of the operation, the vehicle can be operated while independently adjusting the engine speed so that a higher engine output can be exhibited.

  A reverse rotation prevention clutch 79 as shown in FIG. 2 is provided in a transmission system for transmitting power from the traveling transmission device 30 to the seedling planting device 10, and as shown in FIG. Is interlocked with the speed change lever 33 via an interlocking mechanism 80 including an interlocking rod 81 and the like connected at one end to the operation arm 79a.

  As shown in FIGS. 2 and 3, the interlocking mechanism 80 includes an interlocking rod 81, and an end of the interlocking rod 81 opposite to the side connected to the operation arm 79a is rotatable to an output arm 82a. Are connected to each other, and an intermediate portion is rotatably supported by a support shaft 83, an interlocking rod 84 having one end connected to an input arm portion 82b of the interlocking link 82, and the other end of the interlocking rod 84 is An interlocking link 87 connected to the output end side and having an intermediate portion rotatably connected to a bracket 85 fixed to the mounting base portion 36b of the lever support 36 via a connecting pin 86, and an input end of the interlocking link 87 An interlocking rod 88 having one end connected to the side is provided. The other end side of the interlocking rod 88 is connected to an output arm 89 extending from the attachment base portion 33a of the speed change lever 33 so as to be integrally rotatable.

  Therefore, when the speed change lever 33 is operated in the forward range F by the interlocking action of the interlock mechanism 80, the reverse rotation prevention clutch 79 is maintained in the engaged state, and the speed change lever 33 is at the end of the operation path in the forward range F. When switching from the neutral position N to the neutral position N located at the end of the operation path in the reverse range R, the reverse rotation prevention clutch 79 is switched from the on state to the disconnected state, and the speed change lever 33 is moved to the reverse range R. Is operated, the reverse rotation prevention clutch 79 is maintained in the disengaged state. As a result, when the travel transmission 30 is operated in the reverse state during reverse travel, the reverse rotation prevention clutch 79 is automatically switched to the disengaged state, and the reverse drive force from the travel transmission 30 is transmitted to the seedling planting device 10. It is possible to travel while preventing this.

  As shown in FIG. 2, a shift release device 90 including a positioning release body 91 and a lever return body 92 supported by the support shaft 83 is configured to act on the shift lever 33.

  As shown in FIGS. 2 and 3, the shift release device 90 is supported by the positioning release body 91 that is swingably supported by the support shaft 83, and is supported by the support shaft 83 so as to be swingable relative to the positioning release body 91. The lever return body 92, the interlock spring 93 provided between the base portion of the lever return body 92 and the base portion of the positioning release body 91, and an operation in which one end side is connected to the input arm portion 92a of the lever return body 92 A rod 94, an interlocking spring 95 mounted on the other end side of the operation rod 94, and an interlocking arm 96 extended so as to be integrally rotatable from the rotation support shaft 101 of the brake pedal 100 are provided.

  An arc-shaped release operation portion 91 a is provided on the free end side of the positioning release body 91. When the positioning release body 91 is swung around the axis of the support shaft 83, the release operation portion 91a extends integrally from the attachment base portion 33a of the speed change lever 33 so that the extension end side is the lever. The lever pin 97 inserted through the through hole 36d of the support 36 is pressed, and the speed change lever 33 is swung around the axis of the support shaft 35 so that the lever protrusion 52 of the speed change lever 33 is positioned in the lever guide 41. The removal operation is performed from the recess 51.

  The lever return body 92 includes a base member 92b provided with the input arm portion 92a, an intermediate portion rotatably connected to a free end side of the base member 92b via a connecting bolt 98, and one end side connected to a connecting posture adjusting bolt. 99 and a return member 92c adapted to contact and be supported by the base member 92b. When the lever return body 92 is swung around the axis of the support shaft 83, the base member 92b presses the positioning release body 91 against the lever pin 97 of the speed change lever 33 via the interlocking spring 93. Swing operation. When the lever return body 92 is swung around the axis of the support shaft 83, the return member 92c is opposite to the side on which the connection posture adjusting bolt 99 is positioned with respect to the connection bolt 98 of the return member 92c. The lever support 36 is pivotally operated by pressing the operated body 36e provided with a pair of headed pins attached to the mounting base portion 36b of the lever support 36 at the position located at the position of the shift lever. 33 is returned to the neutral position N from the forward zone F or the reverse zone R.

  The end of the interlocking rod 94 opposite to the side connected to the lever return body 92 is supported by a holder 96b rotatably mounted on the free end side of the interlocking arm 96 via a connecting pin 96a. It is slidably inserted into the hole. When the interlocking arm 96 is swung around the axis of the rotary support shaft 101, the holder 96b pushes the interlocking rod 94 forward of the vehicle body via the interlocking spring 95.

  That is, when the brake pedal 100 is depressed, the interlocking arm 96 that swings together with the brake pedal 100 pushes the interlocking rod 94 via the interlocking spring 95, thereby moving the lever return body 92 around the axis of the support shaft 83. And the base member 92b of the lever return body 92 swings the positioning release body 91 around the axis of the support shaft 83 via the interlocking spring 93, so that the release operation portion 91a of the positioning release body 91 is moved. The shifting lever 33 is swung around the axis of the connecting shaft 35 via the lever pin 97 to release the positioning of the shifting lever 33 by the positioning mechanism 50. As a result, when the shift lever 33 can be swung, the lever return body 92 is allowed to rotate relative to the positioning release body 91 by the elastic deformation of the interlocking spring 93 as shown in FIG. As shown in FIG. 9, when the speed change lever 33 is in the forward range F, the return member 92c of the lever return body 92 presses against one of the operated bodies 36e, and if the speed change lever 33 is in the reverse range R as shown in FIG. The return member 92c of the return body 92 presses against the other operated body 36e, and in either case, the lever return body 92 swings the lever support body 36 and returns the shift lever 33 to the neutral position N. To do.

  As a result, when the brake pedal 100 is depressed and the travel brake 102 is turned on, the brake operation causes the gear shift release device 90 to automatically operate to release the positioning mechanism 50 and to neutralize the gear shift lever 33. The return operation to the position N is performed, and when the traveling brake 102 is applied, even if the traveling transmission device 30 remains operated in the forward or reverse shifting state, the shift canceling device 90 is automatically neutral. The brake can be applied in a state where transmission to the front and rear wheels 1 and 2 is stopped.

  FIG. 11 shows an operating device having another embodiment. In the operating mechanism, the linkage mechanism 60 that links the traveling transmission device 30 and the engine speed governor 31 is used for the transmission lever 33. The sensing link 112 provided on the upper surface side of the lever guide 111 having the guide groove 110, the return spring 113 coupled to the sensing link 112, and the sensing link 112 are linked to the operation arm 31a of the engine speed control device 31 by the inner cable 63a. The operation cable 63 is configured to be provided.

  The sensing link 112 is supported by the supporting portion 111a so as to swing around the axis of the circular supporting portion 111a in a plan view provided in the lever guide 111, and is connected to the supporting portion 111a of the sensing link 112. The return spring 113 is oscillated and biased to a reference position in contact with a stopper 114 provided on the lever guide 111 between a portion where the return spring 113 is connected and a portion where the return spring 113 is connected.

  A forward cam portion 116 is provided on the front side of one lateral side edge of the cam groove 115 provided in the sensing link 112 so that the transmission lever 33 is inserted, and a reverse cam portion 117 is provided on the rear side. When the speed change lever 33 is operated to the forward range F, the forward cam portion 116 contacts the speed change lever 33 and swings the sensing link 112 against the return spring 113 using the speed change lever 33 as a reaction member. The operation cable 63 is pulled by the sensing link 112 and formed. When the speed change lever 33 is operated to the reverse speed range R, the reverse cam portion 117 abuts on the speed change lever 33 and uses the speed change lever 33 as a reaction member to swing the sensing link 112 against the return spring 113. Thus, the operation cable 63 is pulled by the sensing link 112.

That is, in this linkage mechanism 60, the traveling transmission device 30 and the engine speed governor 31 are linked so that the engine speed changes as shown in FIG. ing.
That is, the shift line a shown in FIG. 12 indicates that when the speed control means 70 is operated to the second operation state A for movement, the engine speed control apparatus is linked with the speed change operation of the travel transmission 30. The engine speed which changes by 31 performing speed-regulating operation is shown. A shift line b shown in FIG. 12 indicates that when the speed control means 70 is operated to the first operation state B for movement, the engine speed control device 31 adjusts in association with the speed change operation of the travel speed change device 30. The engine speed which changes by operating at high speed is shown. A shift line c shown in FIG. 12 indicates that when the speed adjusting means 70 is operated to the operation state C for operation, the engine speed adjusting device 31 is adjusted in conjunction with the speed change operation of the travel speed changing device 30. The engine speed which changes with operation is shown.

  The detection switch 118 shown in FIG. 11 is detected by the detection switch 118 when the shift lever 33 is operated to the neutral position N at the end of the reverse path R operation path and the reverse range R. It is a backup switch that outputs a signal to be turned on by pressing the piece 118a and to raise the seedling planting device 10.

  13 and 14 show an operating device having another embodiment. In this operating device, a lever support 121 that rotatably supports a base portion 33a of a speed change lever 33 by a support portion 120 is a support shaft. The shift lever 33 is pivotally operated around the axis of the base portion 33a, and is operated in a forward area F formed by the guide groove 42 of the lever guide 41 as shown in FIG. Then, the operation path is switched to the operation path of the reverse region R, and the lever support body 121, the interlocking rod 123, the rocking link are swung in the longitudinal direction of the vehicle body along the guide groove 42 around the axis of the support shaft 122. 124, the traveling transmission 30 is operated to shift through an interlocking mechanism having an interlocking rod 125.

  Further, in this operating device, the interlocking mechanism 80 that interlocks the speed change lever 33 and the reverse rotation prevention clutch 79 is provided with a swing arm 130 that is extended from the base 33a of the speed change lever 33 so as to be integrally rotatable. An interlocking rod 131 having one end connected to the swinging arm 130, a swinging link 133 connected to the other end of the interlocking rod 131 and swingably supported by the support shaft 132, and the swinging link 133. An interlocking rod 134 that is interlocked with the operation arm 79 a of the reverse rotation prevention clutch 79 is provided.

  A detection switch 118 is supported by a support member 135 above the interlocking link 133. When the shift lever 33 is operated to the neutral position N located at the end of the operation path in the reverse range R, the switch operating pin 136 provided on the swing link 133 is This is a backup switch that outputs a signal to be turned on by pressing the sensing piece 118a and to raise the seedling planting device 10. As shown in FIG. 16, the detection switch 118 is maintained in the on state while the pressing operation of the sensing piece 118a by the switch operation pin 136 is maintained while the shift lever 33 is operated in the reverse range R. It is like that.

  FIGS. 17 and 18 show an operating device having a further embodiment. In this operating device, an interlocking mechanism 80 for interlocking the speed change lever 33 and the reverse rotation prevention clutch 79 is provided with an attachment base of the speed change lever 33. An operation arm 140 extended integrally from 33a, an interlocking rod 141 having one end connected to the operation arm 140, the other end of the interlocking rod 141 being connected to the input end, and the lever support 36 A swing link 143 supported swingably on a bracket 85 provided in the mounting base 36b via a connecting shaft 142, an interlock rod 144 having one end connected to the output end side of the swing link 143, and the interlock rod 144 Oscillating link 145 whose other end is connected to input arm portion 145a and whose intermediate portion is rotatably connected to support shaft 146. Have configured an output arm part coupling rod 147 operation has in conjunction with the arm 79a of the anti-reverse clutch 79 to 145b of link 145.

  The shift canceling device 90 in this operating device is provided between the operating arm 150 and the lever return body 151 that are swingably supported by the support shaft 146, and between the operating arm 150 and the interlocking link 145 of the interlocking mechanism 80. The interlocking spring 152 and the lever return body 151 include an interlocking rod 153 and an interlocking spring 154 for interlocking with an interlocking arm 96 extending from the rotation support shaft 101 of the brake pedal 100.

  The lever return body 151 has a base member 151a supported by the support shaft 146 so as to be swingable, and a base end side of the base member 151a is pivotally connected to a free end side of the base member 151a via a connecting shaft 155. The base end side is configured to include a return member 151b that comes into contact with and is supported by the base member 151a via a connection posture adjusting bolt 156.

In other words, when the brake pedal 100 is depressed, the interlocking arm 96 that swings together with the brake pedal 100 pushes the interlocking rod 153 via the interlocking spring 154, whereby the lever return body 151 is moved around the axis of the support shaft 146. The base member 151 a of the lever return body 151 swings the operation arm 150 around the axis of the support shaft 146 via the interlocking spring 152, and the operation arm 150 is the free end of the operation arm 150. The operation pin 157 located on the side is pressed against the output arm portion 145b of the interlocking link 145 of the interlocking mechanism 80 to swing the interlocking link 145, whereby the interlocking rod 144, interlocking link 143, The shift lever 33 is swung around the axis of the connecting shaft 35 via the interlocking rod 141 to be positioned. Releasing the positioning of the shift lever 33 by the fit mechanism 50. When the shift lever 33 can be swung by this, the base of the lever return body 151 is allowed while allowing the lever return body 151 to rotate relative to the operation arm 150 by elastic deformation of the interlocking spring 152 thereafter. The member 151 a presses against one operated body 36 e of the lever support 36, and the return member 151 b of the lever return body 151 presses against the other operated body 36 e of the lever support 36, and the lever return body 151. Thus, the lever support 36 is swung to return the speed change lever 33 to the neutral position N.
As a result, when the brake pedal 100 is depressed and the travel brake 102 is turned on, the brake operation causes the gear shift release device 90 to operate to release the positioning mechanism 50 and to move the gear shift lever 33 to the neutral position. Return to N.

  As shown in FIGS. 18 and 19, the sensing mechanism 55 in this operating device includes a sound output pin 57 slidably supported by a support portion 33 b of the speed change lever 33, and a lateral side of the guide groove 42 of the lever guide 41. Are provided with a plurality of sound emitting recesses 56 arranged side by side in the movement direction of the speed change lever 33.

  Of the plurality of sound output recesses 56, the sound output recess 56 that acts on the sound output pin 57 when the speed change lever 33 is operated in the forward range F, and the sound when the speed change lever 33 is operated in the reverse range R. The sound output recess 56 acting on the output pin 57 is displaced in the lateral direction of the vehicle body.

[Another Example]
The present invention can be applied to various harvesting machines such as a combiner, a tractor, and the like in addition to a rice transplanter. These rice transplanter, harvester, tractor, and the like are collectively referred to as a work machine.

Side view of the entire riding rice transplanter Side view of shift lever support structure Front view of shift lever support structure Plan view of the linkage mechanism between the travel transmission and the engine speed governor Plan view of linkage link and speed control means Explanatory drawing which shows the relationship between the speed change state of a transmission for driving, and engine speed (A) is a plan view in the operating state of the forward movement sensing link, (B) is a plan view in the operating state of the reverse movement detection link. Side view of the shift lever in the forward operation state Side view of the shift lever in the reverse operation state Side view of the shift lever in neutral operation The top view of the linkage mechanism of another embodiment Explanatory drawing which shows the relationship between the speed change state and engine speed of the transmission for driving | running | working of the linkage mechanism provided with another embodiment. Side view of interlocking mechanism of shift lever and reverse rotation prevention clutch with another embodiment Front view of an interlocking mechanism of a shift lever and a reverse rotation prevention clutch provided with another embodiment Plan view of a lever guide of a speed change lever provided with another embodiment Side view showing the operating state of the detection switch Side view of interlocking mechanism of shift lever, reverse rotation prevention clutch and traveling brake with another embodiment Front view of a shift lever, a reverse rotation prevention clutch and a traveling brake provided with another embodiment Plan view of sensing mechanism with another embodiment

Explanation of symbols

30 Traveling gear 31 Engine speed control device 33 Shifting lever 34 Accelerator operating tool 50 Positioning mechanism 60 Linking mechanism 63 Operating cable 70 Adjusting means 90 Shifting release device 102 Traveling brake N Shift lever neutral position OFF Adjusting means operating state

Claims (4)

The engine speed governor operates in a speed increasing manner in conjunction with the upshifting operation of the traveling transmission, and the engine speed governor in conjunction with the downshifting operation of the traveling transmission. Is a working machine provided with a linkage mechanism that links the travel transmission device and the engine speed control device so that the speed control operation is performed on the deceleration side,
A work machine comprising adjusting means for operating the linkage mechanism so that a speed state of the engine speed governor corresponding to a speed change state in which the travel transmission device is operated to change speed.   The accelerator device includes an accelerator operating tool linked to the engine governor so that the adjusting means has an operation state in which the linkage mechanism is operated in a disengaged state, and the engine governor is operated independently. The working machine according to 1.   The linkage mechanism includes an operation cable for linking the travel transmission and the engine speed control device, and the adjustment unit is configured to operate the linkage mechanism by operating an outer cable of the operation cable. The working machine according to claim 1 or 2.   A positioning mechanism for positioning the shift lever for shifting the travel transmission is operated. The shift mechanism is operated by a travel brake application operation to release the positioning mechanism and return the shift lever to a neutral position. The work implement according to any one of claims 1 to 3, further comprising a shift release device that performs the operation.

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