JP2008077178A - Operation vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a low-cost working vehicle capable of opening and closing a driver stand by making unnecessary a work for disconnecting a linkage between an operation tool provided on the driver stand and an operation target unit provided on a self-running body. <P>SOLUTION: The working vehicle includes a mechanical cooperative mechanism 50 for interlocking an operation target unit 43 with a swing arm 53 of the operation tool. Further, the working vehicle includes an engagement means 56 provided between an interlocking member 55 on the operation tool side and an interlocking member 52 on the unit side which constitute the mechanical cooperative mechanism 50. By a relative isolation between the interlocking member 55 on the operation tool side and the interlocking member 52 on the unit side accompanying an open swing of the driver stand, the engagement means 56 is switched to a disengagement state and separates the interlocking member 55 on the operation tool side from the interlocking member 52 on the unit side. By a relative access between the interlocking member 55 on the operation tool side and the interlocking member 52 on the unit side accompanying a close swing of the driver stand, the engagement means 56 is switched to an engagement state and interlocks the interlocking member 55 on the operation tool side with the interlocking member 52 on the unit side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work vehicle including a driver's cab supported by a self-propelled machine body so as to freely swing and open.

The above-described work vehicle is normally capable of opening a self-propelled machine body part that is covered by a driver's cab during inspection or repair.
Conventionally, for example, this type of work vehicle is disclosed in Patent Document 1. The thing shown by patent document 1 is equipped with the structure (equivalent to a driver's cab) by which the bonnet with which the driver's seat was mounted | worn, the boarding step, and the control tower were integrally formed. This structure is supported by a traveling machine body (corresponding to a self-running machine body) so as to be able to swing open and close around a vertical axis, and is displaced between a work position where the hood covers the engine and a maintenance position where the hood is separated from the engine. .

JP 2000-4641 A

  In the case of the work vehicle described above, when the operation target device such as a transmission provided on the self-propelled machine body and the operation tool provided on the cab are linked by the electric linking means, when the cab is opened and closed, the operation target device It is easy to configure so that the driver's cab can be swingably opened and closed while the operation target device and the operation tool remain in a linked state so that it is not necessary to cut off the linkage between the operation tool and the operation tool. However, in this case, it is necessary to include an actuator that drives the operation target device, a detection unit that detects the operation position of the operation tool, and a control unit that operates the actuator based on the detection result of the detection unit. As a result, the cost tends to be high.

  An object of the present invention is to provide a work vehicle that can be obtained at low cost while being able to open and close a driver's cab without the need to disconnect the operation tool and the operation target device.

  According to the first aspect of the present invention, in a work vehicle including a cab supported by a self-propelled machine body so as to be swingable and openable, an operation target device provided on the self-propelled machine body is operated by an operation tool provided on the cab. An operating tool side interlocking member that is supported by the driver's cab and constitutes the mechanical interlocking mechanism, and the self-propelled machine body. And can be switched between an engaged state in which the device side interlocking member constituting the mechanical interlocking mechanism is interlocked and a disengaged state in which the operating tool side interlocking member and the device side interlocking member are separated. Engaging means provided between the operating tool side interlocking member and the apparatus side interlocking member, and the engaging means includes the operating tool side interlocking member and the device side interlocking member associated with swinging of the cab. Detachment due to relative separation of Switched, and is configured to switch to an engaged state by the relative proximity of the operation tool side interlocking member associated with the cab closed swinging the device side interlocking member.

  According to the configuration of the first aspect of the present invention, when the cab is opened and closed, the engaging means is switched to the disengaged state due to the relative separation between the operation tool side interlocking member and the device side interlocking member accompanying the swinging movement of the cab. The tool and the operation target device are separated from each other. Further, the engaging means is switched to the engaged state by the relative approach between the operating tool side interlocking member and the apparatus side interlocking member accompanying the closing swing of the cab, and the operating tool and the operation target device are interlocked. As a result, it is possible to open the driver's cab without linking the operation tool and the operation target device while linking the operation tool and the operation target device with the mechanical interlocking mechanism.

  Therefore, a work vehicle that can efficiently perform inspection and repair work by opening the cab without taking the effort to interlock the operation tool and the operation target device, the operation tool and the operation target device are connected by a mechanical interlocking mechanism. It can be obtained in a linked state and at a reduced cost.

  According to the second aspect of the invention, in the configuration of the first aspect of the invention, the operating tool side interlocking member and the apparatus side interlocking member are supported so as to integrally swing around the same axis in an interlocking state.

  According to the configuration of the second aspect of the invention, when the operating tool side interlocking member and the apparatus side interlocking member operate in conjunction with each other by the engaging means, they swing around the same axis. For this reason, the operation tool side interlocking member and the apparatus side interlocking member can be operated in an interlocked manner in a state in which rattling is unlikely to occur. Accordingly, the operation tool and the operation target device are not always interlocked with each other when the cab is opened, but the operation target device operates in response to the operation of the operation tool with high responsiveness. The operation target device can be operated in the state.

  According to a third aspect of the present invention, in the configuration of the first or second aspect of the invention, the engaging means includes a connecting pin provided in one of the operating tool side interlocking member and the apparatus side interlocking member, a pin hole provided in the other, a position Charge spring means for engaging and energizing the connecting pin and the pin hole in a shifted state is provided.

  According to the configuration of the third aspect of the invention, when the cab is closed, even if the connecting pin and the pin hole are misaligned and the operating tool side interlocking member and the apparatus side interlocking member are not interlocked, the cab When the operating tool is operated in the closed state, and the connecting pin and the pin hole are matched due to the operation of the operating tool side interlocking member, the connecting pin and the pin hole are engaged and biased by the charge spring means. Engage with itself. As a result, when the cab is closed, even if the operation tool and the operation target device may not be linked, the operation tool and the operation target can be operated only by moving the operation tool without reopening and closing the cab. It is possible to easily obtain the interlocking state so that the device is interlocked.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a combine according to an embodiment of the present invention. FIG. 2 is an overall plan view of the combine according to the embodiment of the present invention. As shown in these drawings, the combine according to the embodiment of the present invention includes a self-propelled aircraft having a crawler traveling device 1, and a cutting unit 10 connected to a front portion of a body frame 2 of the self-propelled aircraft, A threshing device 3 and a grain tank 4 are provided on the rear part of the machine body frame 2 side by side and mounted in the lateral direction of the self-propelled machine body.

  This combine harvests rice, wheat and other grains. In other words, the cutting unit 10 is moved horizontally to the front end of the cutting unit 10 by swinging the main frame 11 of the cutting unit 10 up and down with respect to the body frame 2 by a hydraulic cylinder (not shown). The weeding tool 12 positioned side by side in the direction is moved up and down into a descending work state in which the weeding tool 12 is located near the ground, and a lifting non-working state in which the weeding tool 12 is elevated from the ground. When the cutting unit 10 is in the descending work state and the self-propelled vehicle is caused to travel, the cutting unit 10 causes the planted cereals to be harvested by the weeding tools 12 to be raised behind the weeding tools 12. The clipper type that is introduced into each of the elevating paths 13, is raised and processed by the elevating device 14 that is located on the side of the path 13 and is located at the end of the elevating path 13. The reaping process is performed by the reaping device 15, and the cereal grains from the reaping device 15 are conveyed backward by the supply device 16 and supplied to the threshing device 3. The threshing device 3 feeds the tip side of the harvested cereal cocoon to the handling room (not shown) while sandwiching the stock side of the chopped cereal meal by a threshing feed chain (not shown) and transporting it backward in the self-propelled machine body. Then, the tip side is threshed. The grain tank 4 collects and stores the threshed grains conveyed from the threshing device 3. The grain tank 4 includes a discharge screw 5 positioned at the bottom of the tank, a vertical screw conveyor 6 positioned at the rear of the grain tank 4, and a horizontal screw conveyor 7 connected to the upper end of the vertical screw conveyor 6. The threshing grains in the tank are discharged. The horizontal screw conveyor 7 can swivel and undulate with respect to the vertical screw conveyor 6.

  The self-propelled machine body includes the crawler traveling device 1 and the machine body frame 2, and a prime mover 20 having an engine bonnet 21 located near the front of the grain tank 4, and a position above the engine bonnet 21. And a driving unit 30 having a driving seat 31. The engine bonnet 21 includes an intake case 29 that is disposed on the rear side of the driver's seat 31 and is connected to the engine bonnet 21.

  FIG. 1 shows the structure of the driving unit 30 in a side view, and FIG. 2 shows the structure of the driving unit 30 in a plan view. As shown in these drawings, the driving unit 30 includes the driver's seat 31 and also includes a driver's cab 30A equipped with a driver's floor 32 positioned in front of the driver's seat 31.

  As shown in FIGS. 1 and 2, the cab 30 </ b> A includes the cab floor 32, the engine bonnet 21 as a seat support for mounting the cab seat 31, and the front end of the cab floor 32. A control tower 33 erected on the side, a side wall 34 connected to the end of the operation unit floor 32 opposite to the side on which the entrance / exit is located, and an upper part of the side wall 34. And an operation panel 35.

FIG. 2 shows a closed state of the cab 30A, and FIG. 3 shows an open state of the cab 30A. As shown in these drawings, the driver's cab 30A is rotatably supported by a support column 36 provided upright on the machine body frame 2, and is located on the rear side of the self-propelled machine body from the engine 22, and the engine 22 itself. The self-propelled machine body can be opened and closed in an open state and a closed state around the vertical axis X located on the inward side of the self-propelled machine with respect to the outer side of the machine body in the lateral direction. The cab 30A in the closed state covers the engine 22 and the engine cooling radiator 27 with the engine bonnet 21, and the operation section floor 31, the control tower 33, the side wall 34, and the operation panel 35 are placed at predetermined positions of the self-propelled aircraft. Deploy. The opened cab 30A is located behind the self-propelled aircraft of the engine 22, opens the engine 22 and the engine cooling radiator 27 so that they can be easily inspected and repaired. The self-propelled machine body part covered with the side wall 34 is opened so that it can be easily inspected and repaired.

  As shown in FIGS. 1 and 2, the cab 30 </ b> A includes a travel lever 40 as an operation tool provided on the operation panel 35 and a brake pedal 41 as an operation tool provided on the front end side of the operation unit floor 31. I have. The travel lever 40 is a hydrostatic continuously variable transmission 43 (refer to FIG. 4, hereinafter abbreviated as a continuously variable transmission 43) as an operation target device mounted on a transmission case 42 supported at the front end of the body frame 2. )), Thereby driving, stopping, and shifting the travel device 1. The brake pedal 41 operates a friction brake 44 (hereinafter abbreviated as a brake 44) as an operation target device equipped in the mission case 42, and thereby brakes the traveling device 1.

  FIG. 4 shows the structure of the mechanical interlocking mechanism 50 that interlocks the traveling lever 40 with the operation portion 43a of the continuously variable transmission 43 in a side view of the self-propelled machine body. FIG. 5 shows a structure of the mechanical interlocking mechanism 50 for shifting as viewed from the front-rear direction of the self-propelled aircraft. As shown in these figures, the mechanical interlocking mechanism 50 for shifting includes an interlocking rod 51 in which a lower end side connecting shaft 51a is connected to an operation portion 43a of a continuously variable transmission 43, and an upper end of the interlocking rod 51. A transmission-side interlocking member 52 having a free end connected to the connecting shaft 51b on the side, a swing arm 53 connected to the rotary support shaft 40a of the speed change lever 40 so as to be integrally rotatable, and an upper end to the swing arm 53 The interlocking rod 54 to which the connecting shaft 54a on the side is connected, the lever-side interlocking member 55 whose free end is connected to the bent end 54b on the lower end side of the interlocking rod 54, the lever-side interlocking member 55 and the speed change Engaging means 56 provided over the apparatus-side interlocking member 52 is provided.

  The lever-side interlocking member 55 is connected to the cab 30A through a support member 57 fixed to the lateral side wall 34 and a connecting shaft 58 that connects the support member 57 and the base of the lever-side interlocking member 55. It is supported by the side wall 34. As a result, the lever side interlocking member 55 swings in the vertical direction of the self-propelled machine body around the axis 58 a of the connecting shaft 58 that faces the self-propelled machine body. The transmission side interlocking member 52 connects the transmission case 42, a support member 59 whose lower end side is fixed to the transmission case 42, an upper end portion of the support member 59 and a base portion of the transmission side interlocking member 52. It is supported by the body frame 2 of a self-propelled body through a connecting shaft 60 that is connected. As a result, the transmission-side interlocking member 52 swings around the axis 60a of the connecting shaft 60 in the vertical direction of the self-propelled machine body.

  As shown in FIGS. 6, 7, and 10, the engagement means 56 enables the connection pin 56 a provided on the lever side interlocking member 55 and the connection pin 56 a to be engaged with and disengaged from the transmission side interlocking member 52. And a pin hole 56b provided. The connecting pin 56 a is configured by the bent end portion 54 b of the interlocking rod 54. The engaging means 56 includes a charge spring means 56 c formed of the transmission side interlocking member 52.

  10 (a) shows the engaged state of the engaging means 56, FIG. 10 (b) shows the disengaged state of the engaging means 56, and FIG. 10 (c) shows the state of the engaging means 56. Indicates the charge state. As shown in these drawings, the engaging means 56 is switched between an engaged state and a disengaged state or in a charged state when the cab 30A is opened and closed.

That is, when the cab 30A is operated to open, the lever side interlocking member 55 moves together with the oscillating cab 30A, and the lever side interlocking member 55 and the transmission side interlocking member 52 are relatively separated from each other so that the connecting pin 56a comes off from the pin hole 56b. As a result, the engaging means 56 is in a disengaged state in which the lever side interlocking member 55 and the transmission side interlocking member 52 are separated from each other, and the interlocking between the speed change lever 55 and the operating portion 43a of the continuously variable transmission 43 is cut off.
When the cab 30A is operated in the closed state, the lever side interlocking member 55 moves together with the oscillating cab 30A, the lever side interlocking member 55 and the transmission side interlocking member 52 are relatively close to each other, and the connecting pin 56a is moved. It engages with the pin hole 56b. As a result, the engaging means 56 is brought into an engaged state in which the lever side interlocking member 55 and the transmission side interlocking member 52 are interlocked, and the speed change lever 40 is interlocked with the operation portion 43 a of the continuously variable transmission 43. Further, the engaging means 56 interlocks the lever-side interlocking member 55 and the transmission-side interlocking member 52 so that the shaft cores 58a and 60a for swinging become the same shaft core Y and swing together. At this time, as shown in FIG. 8, the concave guide 61 a provided at the end of the connecting shaft 58 connected to the lever side interlocking member 55 and the connecting shaft 60 connected to the transmission side interlocking member 52. The positioning means 61 composed of the convex guide 61b provided at the end is moved from the released state in which the concave guide 61a and the convex guide 61b are disengaged as shown in FIG. By switching to the operation state in which the guide 61a and the convex guide 61b are engaged, the connecting shafts 58 and 60 are positioned so as to be aligned, and the connecting pin 56a and the pin hole 56b are easily engaged.
The transmission-side interlocking member 52 indicated by a two-dot chain line in FIG. 10C shows a state where it is connected to the connecting pin 56a. The transmission-side interlocking member 52 shown by the solid line in FIG. 10C shows a state in which it is elastically deformed. As shown in this figure, when the cab 30A is operated in the closed state, if the connecting pin 56a and the pin hole 56b are misaligned, the connecting pin 56b is removed from the pin hole 56b of the transmission-side interlocking member 52. The transmission-side interlocking member 52 is in contact with the disengaged part, and the part connected to the connection shaft 60 by the pressing action of the connection pin 56a serves as a swing fulcrum, and the free end side where the pin hole 56b is located is the lever-side interlocking member. Elastically deforms in a swinging state away from 55. As a result, the engaging means 56 is in a charged state in which the transmission side interlocking member 52 is used as the charge spring means 56c and the connecting pin 56a and the pin hole 56b are engaged and biased, and the speed change lever 40 is moved and operated. As 56a and pin hole 56b match, connecting pin 56a is engaged with pin hole 56b, and lever side interlocking member 55 and transmission side interlocking member 52 are interlocked.

FIG. 11 is a perspective view of a mechanical interlocking mechanism 70 that interlocks the brake pedal 41 with the operation portion 44 a of the brake 44. As shown in this figure, the mechanical interlocking mechanism 70 for the brake includes an operation cable 71 having one end connected to the operation portion 44a of the brake 44, and a bifurcated portion 72a connected to the other end of the operation cable 71. The brake-side interlocking member 72, the pedal-side interlocking member 73 connected to the mounting cylinder 41b of the pedal arm 41a of the brake pedal 41 so as to be integrally rotatable, the pedal-side interlocking member 73, and the brake-side interlocking member 72 Engaging means 74 provided thereover.
The hook 98 shown in FIG. 11 is engaged with the pin 41c of the pedal arm 41a to hold the brake pedal 41 in the depressed position and hold the brake 44 in the engaged state.

  The brake pedal 41 is oscillated and biased to the ascending position by a return spring 76 connected to an arm 75 provided in the mounting cylinder 41b. The pedal-side interlocking member 73 is supported on the frame portion of the cab 30A via a pedal support shaft 77. As a result, the pedal-side interlocking member 73 swings in the up-and-down direction of the self-propelled machine body together with the brake pedal 41 around the self-propelled machine body lateral axis 77 a of the pedal support shaft 77. The brake side interlocking member 72 is connected to the bracket 78 fixed to the body frame 2 at the base of the brake side interlocking member 72, and the body frame 2 of the self-propelled body via the bracket 78. It is supported by. As a result, the brake-side interlocking member 72 swings in the vertical direction of the self-propelled machine body around the axis 79 a of the connecting shaft 79. The brake-side interlocking member 72 is oscillated and biased by a return spring 81 to the swing limit where the base of the brake-side interlocking member 72 is in contact with a stopper 80 provided continuously with the bracket 78. The operation cable 71 includes an outer cable 71a and an inner cable 71b. One end side of the outer cable 71 a is connected to the cable support portion of the brake side interlocking member 72, and one end side of the inner cable 71 b is connected to the cable holder 83 via the spring 82. The cable holder 83 is supported by the support member 57 fixed to the body frame 2. The pedal side interlocking member 73 includes a pair of interlocking rods 85 and 85 respectively connected to the pair of long holes 73a and 73a. When the travel lever 40 is operated from the forward side or the reverse side to the neutral position and the continuously variable transmission 43 is in the neutral state, the brake pedal 41 is braked by the operating force of the travel lever 40. The pedal-side interlocking member 73 and the travel lever 40 are linked so as to be operated in the state.

  As shown in FIGS. 12 and 13, the engaging means 74 includes a connecting pin 74 a provided at the bifurcated portion 72 a of the brake side interlocking member 72 and an engagement / disengagement of the connecting pin 74 a with respect to the pedal side interlocking member 73. And a pin spring 74c formed of a coil spring mounted on the connecting pin 74a between the pair of support pieces of the bifurcated portion 72a.

13 (a) shows the engaged state of the engaging means 74, FIG. 13 (b) shows the disengaged state of the engaging means 74, and FIG. 13 (c) shows the charged state of the engaging means 74. Show. As shown in these drawings, the engaging means 74 is switched between the engaged state and the disengaged state or in the charged state when the cab 30A is opened and closed.
That is, when the cab 30A is operated in the open state, the pedal-side interlocking member 73 moves together with the swinging cab 30A, and the pedal-side interlocking member 73 and the brake-side interlocking member 72 are relatively separated from each other, so that the connecting pin 74a is moved. Comes out of the pin hole 74b. Thereby, the engaging means 74 will be in the separation | separation state which isolate | separated the pedal side interlocking member 73 and the brake side interlocking member 72, and will interrupt | link the brake pedal 41 and the operation part 44a of the brake 44.
When the cab 30A is operated in a closed state, the pedal side interlocking member 73 moves together with the oscillating cab 30A, the pedal side interlocking member 73 and the brake side interlocking member 72 are relatively close to each other, and the connecting pin 74a is pinned. It engages with the hole 74b. Thereby, the engaging means 74 will be in the engagement state which linked the pedal side interlocking member 73 and the brake side interlocking member 72, and makes the brake pedal 41 interlock with the operation part 44a of the brake 44. FIG. At this time, the pedal support shaft 77 and the connecting shaft 79 are aligned in a straight line. Thereby, the engaging means 74 sets the shaft core 77a for swinging the pedal-side interlocking member 73 and the shaft core 79a for swinging the brake-side interlocking member 72 to the same axis Z, so that the pedal-side interlocking is performed. The member 73 and the brake side interlocking member 72 are rocked integrally around the axis Z.
When the cab 30A is operated in the closed state, if the connecting pin 74a and the pin hole 74b are misaligned, the portion of the pedal side interlocking member 73 that is removed from the pin hole 74b abuts on the connecting pin 74, and the connecting pin 74a is connected. The pin 74a is slid to the retraction side by the pressing action of the pedal side interlocking member 73, and the spring receiving pin 86 fixed to the connecting pin 74a elastically deforms the charge spring 74c to the compression side. As a result, the engaging means 74 is in a charged state in which the connecting pin 74a and the pin hole 74b are engaged and biased by the charge spring 74c, and the brake pedal 41 is moved so that the connecting pin 74a and the pin hole 74b are matched. Accordingly, the connecting pin 74a is engaged with the pin hole 74b, and the pedal side interlocking member 73 and the brake side interlocking member 72 are interlocked.

  As described above, when the cab 30A is switched to the open state, the lever side interlocking member 55 is separated from the transmission side interlocking member 52 around the axis X to swing toward the open state of the cab 30A. Then, the connecting pin 56a is detached from the transmission-side interlocking member 52, and the engaging means 56 is switched to the disengaged state. As a result, the traveling lever 40 and the operating portion 43a of the continuously variable transmission 43 are automatically switched to the separated state. Further, the pedal side interlocking member 73 is separated from the brake side interlocking member 72 around the axis X in order to swing the driver's cab 30A toward the open state, and the connecting pin 74a is detached from the pedal side interlocking member 73. The engagement means 74 is switched to the disengaged state. As a result, the brake pedal 41 and the operation portion 44a of the brake 44 are automatically switched to the separated state. As a result, it is not necessary to take special effort to switch the transmission lever 40 and the continuously variable transmission 44 to the separated state and to switch the brake pedal 41 and the brake 44 to the separated state.

  On the other hand, when returning the cab 30A to the closed state, the lever-side interlocking member 55 approaches the transmission-side interlocking member 52 around the axis X in order to swing the cab 30A toward the closed state. When the connecting pin 56a is engaged with the transmission-side interlocking member 52 and the engaging means 56 is switched to the engaged state, and the cab 3A is switched to the closed state, the traveling lever 40 operates the continuously variable transmission 43. It returns to the state interlocked with the part 43a. In the case where the traveling lever 40 and the continuously variable transmission 43 are not in an interlocked state even though the cab 30A is switched to the closed state, the traveling lever 40 is rotated with the rotating lever 40 while the cab 30A remains closed. Move around the axis 40a. Then, since the engaging means 56 is in a charged state, the connecting pin 56a is moved to the transmission side interlocking member 52 by the urging force of the transmission side interlocking member 52 as the connection pin 56a and the pin hole 56b are matched. The engaging means 56 is switched to the engaged state. As a result, the travel lever 40 and the continuously variable transmission 43 are linked to each other, and the continuously variable transmission 40 can be operated by the travel lever 40. That is, when the traveling lever 40 is swung in the front-rear direction of the self-propelled body around the axis of the rotation support shaft 40a, the swing arm 53 swings with the travel lever 40 around the axis of the rotation support shaft 40a. 54 is pushed and pulled to swing the lever side interlocking member 55 around the shaft core 58a. Then, the transmission-side interlocking member 52 swings integrally with the lever-side interlocking member 55 around the shaft core 60a having the same axis X as the shaft core 58a, and the interlocking rod 51 is pushed and pulled to operate the operating portion 43a. Swing operation. As a result, the continuously variable transmission 43 operates in the forward or reverse transmission state or neutral state.

  Further, when the cab 30A is returned to the closed state, the pedal-side interlocking member 73 approaches the brake-side interlocking member 72 around the axis X in order to swing toward the closed state of the cab 30A. The pin 74a engages with the pedal side interlocking member 73, and the engaging means 74 switches to the engaged state. Thereby, when the cab 30A is switched to the closed state, the brake pedal 41 returns to the state interlocked with the brake 44. If the brake pedal 41 and the brake 44 are not in an interlocked state even though the cab 30A is switched to the closed state, the brake pedal 41 is swung while the cab 30A is in the closed state. Then, since the engaging means 74 is in the charged state, the connecting pin 74a is engaged with the pedal side interlocking member 73 by the urging force of the charge spring 74c as the connecting pin 74a and the pin hole 74b are matched. The engaging means 74 is switched to the engaged state. As a result, the brake pedal 41 and the brake 44 are in an interlocking state, and the brake 44 can be operated by the brake pedal 41. That is, when the brake pedal 41 is depressed, the pedal-side interlocking member 73 swings with the brake pedal 41 around the shaft core 77 a of the pedal support shaft 77. Then, the brake side interlocking member 72 swings integrally with the pedal side interlocking member 73 around the shaft core 79a having the same axis Z as the shaft core 77a, and the operation cable 71 is operated to swing the operation portion 44a. To do. As a result, the brake 44 is turned on.

  As shown in FIGS. 5 and 6, a positioning spring 90 having a coil portion fitted on the connecting shaft 60 is mounted over the transmission-side interlocking member 52 and the support member 59. As shown in FIGS. 8 and 9, a spring receiving piece 91 that is inserted between a pair of spring ends 90a and 90b of the positioning spring 90 is provided on the support member 59, and between the pair of spring ends 90a and 90b. The spring operating piece 92 that has entered is provided on the transmission-side interlocking member 52. As a result, the positioning spring 90 positions the transmission-side interlocking member 52 that has been disconnected from the lever-side interlocking member 55 at a neutral position where the continuously variable transmission 43 is in a neutral state.

  That is, when the transmission side interlocking member 52 is swung from the neutral position N to the forward side F, one spring end 90b of the positioning spring 90 is supported by the spring receiving piece 91 and the other spring end 90a is shifted. A pressing operation is performed by a spring operation piece 92 that moves together with the apparatus-side interlocking member 52. When the transmission side interlocking member 52 is swung from the neutral position N to the reverse side R, the other spring end 90a of the positioning spring 90 is supported by the spring receiving piece 91, and the one spring end 90b is the transmission. A pressing operation is performed by a spring operation piece 92 that moves together with the side interlocking member 52. As a result, the positioning spring 90 is elastically deformed regardless of whether the transmission side interlocking member 52 is swung forward or backward, and the elastic restoring force provided thereby is applied to the spring operating piece 92. The transmission side interlocking member 52 is positioned at the neutral position N.

  As shown in FIG. 6, the support member 59 is provided with a potentiometer 93 as an engine start check means attached to the support portion 59a. The potentiometer 93 includes a swing arm 94 that is coupled to the rotary operation shaft 93a so as to be rotatable integrally with the rotary operation shaft 93a, and an interlocking pin provided on the transmission-side interlocking member 52 in a state of being engaged with the elongated hole 94a. The transmission is interlocked with the transmission-side interlocking member 52. The potentiometer 93 detects the neutral position N of the transmission-side interlocking member 52 as a neutral state of the continuously variable transmission 43, and outputs an engine start permission command to an engine starter (not shown) based on the detection result. The engine 22 can be started when the continuously variable transmission 43 is in a neutral state.

That is, when the driver's cab 30A is opened and the gear shift lever 40 and the continuously variable transmission 43 are disengaged, the engine 28 is started even if the gear shift lever 40 is operated to an operating position other than the neutral position. It can be done.
That is, when the speed change lever 40 that is disconnected from the continuously variable transmission 43 is operated to the forward or reverse operation position, the shift mechanism 40 is held by the friction mechanism 96 (see FIG. 4). Even in this case, the transmission-side interlocking member 52 is positioned at the neutral position N by the positioning spring 90. Then, the potentiometer 93 detects that the continuously variable transmission 43 is in a neutral state, and outputs an engine start permission command.

[Another Example]
Instead of the engaging means 56 and 74 of the above-described embodiment, a connection pin is provided in the transmission-side interlocking member 52 or the pedal-side interlocking member 73, and a pin hole is provided in the lever-side interlocking member 55 or the brake-side interlocking member 72. You may implement by employ | adopting the engagement means provided with. Also in this case, the object of the present invention can be achieved.

  The present invention can be applied to a case where a driving unit equipped with a driving cabin is employed instead of the driving unit of the above-described embodiment. Therefore, the driver's cab 30A and the driver's cabin are collectively referred to as driver's cab 30A.

  The present invention can be applied to a harvester, a transport vehicle, and the like for harvesting crops other than cereals such as carrots and onions in addition to a combine. Therefore, these combine, harvester, transporter, etc. are collectively referred to as a work vehicle.

Combine side view Overall plan view of combine Top view of combine with cab open Side view of a mechanical interlocking mechanism for shifting Front view of mechanical interlocking mechanism for shifting Side view in the engaged state of the lever side interlocking member and the transmission side interlocking member Front view of engaging means (A) is a cross-sectional view of the positioning means in the operating state, (b) is a cross-sectional view of the positioning means in the released state, Side view of positioning spring (A) is a sectional view of the engaging means for shifting, and (B) is a sectional view of the engaging means for shifting, (C) is an engaging means for shifting. Cross section in the charged state Perspective view of mechanical interlocking mechanism for brake Front view of engaging means (A) is a cross-sectional view of the brake engagement means in the engaged state, (B) is a cross-sectional view of the brake engagement means in a disengaged state, and (C) is the brake engagement means. Sectional view in the charge state of

Explanation of symbols

30A Driver's cab 40, 41 Operation tool 43, 44 Operation target device 43a, 44a Operation unit 50, 70 of operation target device Mechanical interlocking mechanism 52, 72 Device side interlocking member 55, 73 Operation tool side interlocking member 56, 74 Engagement Means 56a, 74a Connecting pins 56b, 74b Pin holes 56c, 74c Charge spring means X, Y

Claims (3)

A work vehicle having a driver's cab supported by a self-propelled vehicle so as to be swingable and openable.
A mechanical interlocking mechanism that interlocks the operation unit of the operation target device and the operation tool so that the operation target device provided in the self-propelled machine body is operated by an operation tool provided in the cab;
A member that is supported by the driver's cab and that constitutes the mechanical interlocking mechanism, and a device-side interlocking member that is supported by the self-propelled machine body and that constitutes the mechanical interlocking mechanism. An engagement means provided across the operating tool side interlocking member and the device side interlocking member so as to be switchable between a combined state and a disengaged state in which the operating tool side interlocking member and the device side interlocking member are separated;
The engaging means is switched to a disengaged state by the relative separation between the operating tool side interlocking member and the apparatus side interlocking member accompanying the swinging movement of the cab, and the interlocking means side interlocking when the cab is closed and swinging. A work vehicle configured to be switched to an engaged state by a relative approach between a member and the device-side interlocking member.   2. The work vehicle according to claim 1, wherein the operation tool side interlocking member and the apparatus side interlocking member are supported so as to integrally swing around the same axis in an interlocking state.   The engaging means engages and urges the connecting pin provided in one of the operating tool side interlocking member and the apparatus side interlocking member, the pin hole provided in the other, and the connecting pin and the pin hole in a misaligned state. The work vehicle according to claim 1, further comprising charge spring means.

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