JP2019196133A - Work vehicle - Google Patents

Abstract

To provide a work vehicle which does not inhibit manned operation of a brake operation tool despite having a structure in which an unmanned operation actuator is connected to the brake operation tool.SOLUTION: A tractor T includes: a travelling vehicle body 1; a brake device which brakes travelling of the travelling vehicle body 1; and a brake pedal 15 which causes the brake device to operate according to a predetermined operation. The tractor T includes an unmanned operation actuator 17 which is connected to the brake pedal 15 through a connection mechanism 18 and causes the brake device to operate based on an unmanned operation of the brake pedal 15 through the connection mechanism 18. The connection mechanism 18 allows manned operation of the brake pedal 15 even in a state where the unmanned operation actuator 17 and the brake pedal 15 are connected.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a work vehicle such as a tractor.

  When a work vehicle capable of automatic traveling or remote control traveling is configured on the basis of an existing work vehicle (see, for example, Patent Documents 1 and 2), it is necessary to include an emergency stop unit that unmannedly stops the traveling machine body unattended. For example, since the work vehicle described in Patent Document 1 includes a parking brake that can be electromagnetically actuated, the traveling vehicle body can be urgently stopped using the parking brake.

JP-A-9-207733 JP 2017-52457 A

  However, in a work vehicle that does not include an electromagnetically operable parking brake as described in Patent Document 2, an unmanned operation actuator is connected to a brake operation tool (brake pedal) via a connection mechanism, and the unmanned operation Since it is necessary to operate the braking device based on the unmanned operation of the brake operation tool by the actuator, the manned operation of the brake operation tool may be hindered.

The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 includes a traveling machine body, and a braking device that brakes traveling of the traveling machine body. A braking operation tool that operates the braking device in response to a predetermined operation, and is connected to the braking operation tool via a connection mechanism, and the brake operation tool is connected to the braking operation tool via the connection mechanism. An unmanned operation actuator that operates the braking device based on an unmanned operation, and the coupling mechanism is configured to perform manned operation of the brake operation tool even when the unmanned operation actuator and the brake operation tool are coupled. Is allowed.
The invention according to claim 2 is the work vehicle according to claim 1, wherein the coupling mechanism includes a flexible wire, and the wire is based on a pulling operation by the unmanned operation actuator. While the brake operating tool is unmanned, manned operation of the brake operating tool is allowed based on the bending of the wire.
The invention according to claim 3 is the work vehicle according to claim 2, wherein the connection mechanism includes a connection pin for connecting the brake operation tool and the wire, and is based on attachment / detachment of the connection pin. The braking operation tool and the unmanned operation actuator are switched between a connected state and a non-connected state.

According to the first aspect of the present invention, there is provided an unmanned operation actuator that is connected to the brake operation tool via the connection mechanism and activates the braking device based on the unmanned operation of the brake operation tool via the connection mechanism. However, even when the unmanned operation actuator and the brake operation tool are connected, manned operation of the brake operation tool can be permitted.
According to a second aspect of the present invention, the coupling mechanism includes a flexible wire, and the brake operating tool is unmanned based on a pulling operation of the wire by an unmanned operation actuator, while the wire is bent. Therefore, manned operation of the brake operating tool is allowed, so that the structure can be simplified and the cost can be reduced as compared with the case where the connecting mechanism having the same function is configured by the link mechanism.
According to the invention of claim 3, the connection mechanism includes a connection pin for connecting the brake operation tool and the wire, and the brake operation tool and the unmanned operation actuator are connected to each other based on the attachment / detachment of the connection pin. Since the switching to the unconnected state is performed, the unmanned operation actuator can be easily disconnected from the braking operation tool in the case where a failure occurs in the unmanned operation actuator.

It is a left view of the tractor which concerns on one Embodiment of this invention. It is a principal part perspective view of the tractor which shows the left front part of a cabin. It is a principal part perspective view of the control part which shows a brake pedal. It is the perspective view which looked at the unmanned operation device from diagonally back. It is the perspective view which looked at the unmanned operation device from diagonally forward. It is a disassembled perspective view which shows the connection structure of a connection mechanism and a brake pedal. It is the perspective view which looked at the actuator for unmanned operation from the slanting back. FIG. 3 is a three-side view of an unmanned operation actuator, (a) is a plan view of the unmanned operation actuator, (b) is a left side view of the unmanned operation actuator, and (c) is a rear view of the unmanned operation actuator. It is a principal part side view of the tractor which shows wiring of a wire. It is a principal part bottom view of a tractor which shows wiring of a wire.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a traveling machine body of a tractor T (work vehicle). The traveling machine body 1 includes an engine mounting portion 2 on which an engine (not shown) is mounted, a transmission case 3 that changes engine power, and , A front wheel 4 and a rear wheel 5 that are rotationally driven by power output from the mission case 3, a work machine connection unit 6 capable of connecting various work machines (not shown), and a control unit 7 on which an operator gets on. And a cabin 8 that covers the control unit 7.

  The cabin 8 covers the front, rear, left side, and right side of the control unit 7 with a transparent glass except for the roof portion 9, thereby protecting the operator from rain, wind, etc., and ensuring good visibility of the operator. is doing. For example, the front of the control unit 7 is covered with a transparent windshield 10, but as shown in FIG. 2, below the left and right end portions of the windshield 10, the height of the bonnet 11 and the floor surface 12 of the control unit 7. A front side glass 13 extending downward to a height is provided, and an operator sitting on the driver's seat 14 can visually check the turning angle (steering angle) of the front wheel 4 through the front side glass 13.

  As shown in FIG. 3, a brake pedal 15 (braking operation tool) that performs a braking operation of the traveling machine body 1 is provided in the lower part on the front side in the control unit 7. The brake pedal 15 of this embodiment includes a left brake pedal 15a connected to a left side brake (braking device) (not shown), a right brake pedal 15b connected to a right side brake (braking device) (not shown), and a left brake pedal. 15a and the right brake pedal 15b are provided with the pedal connection part 15c which switches a connection state and a non-connection state.

  When the pedal connecting portion 15c is in the non-connected state, if the left brake pedal 15a is depressed, the left rear wheel 5 is braked in accordance with the operation of the left side brake, while the right brake pedal 15b is depressed, The right rear wheel 5 is braked in accordance with the operation of the brake. If the left brake pedal 15a or the right brake pedal 15b is depressed when the pedal connecting portion 15c is in the connected state, the left and right rear wheels 5 are braked simultaneously according to the operation of the left side brake and the right side brake.

  As shown in FIGS. 4 to 10, the traveling machine body 1 is provided with an unmanned operation device 16 for unmanned operation of the brake pedal 15. The unmanned operation device 16 includes an unmanned operation actuator 17 and a coupling mechanism 18 that couples the unmanned operation actuator 17 to the brake pedal 15.

  The unmanned operation actuator 17 of the present embodiment is an electric cylinder, and is provided at a cylinder tube 19, a cylinder rod 20 protruding from one end of the cylinder tube 19, and the other end of the cylinder tube 19. An electric motor 21 for moving in and out.

  The connection mechanism 18 of the present embodiment includes a wire cable 22, a cylinder connection pin 23 that connects one end side (actuator side) of the wire cable 22 to the cylinder rod 20 of the unmanned operation actuator 17, and the other end side of the wire cable 22. A wire side connecting member 24 provided on the (pedal side), a pedal side connecting member 25 attached to the brake pedal 15, and a pedal connecting pin 26 (connecting pin) for connecting the wire side connecting member 24 and the pedal side connecting member 25. And comprising.

  The wire cable 22 includes a flexible cylindrical outer cable 27 and a flexible inner wire 28 (wire) inserted through the outer cable 27, and one end side of the inner wire 28 has a cylinder connecting pin 23. The other end side of the inner wire 28 is connected to the brake pedal 15 via the wire side connecting member 24, the pedal connecting pin 26 and the pedal side connecting member 25. In addition, one end side of the outer cable 27 is fixed to a later-described bracket 29 that is also used as an outer receiving member and a cover body, and the other end side of the outer cable 27 is provided in the vicinity of the front of the brake pedal 15. Fixed to.

  According to the unmanned operation device 16 configured as described above, when the unmanned operation actuator 17 is operated in the reduction direction (cylinder rod immersion direction), the brake pedal 15 is depressed in the operation direction based on the pulling operation of the inner wire 28. It becomes possible to operate. Further, when the unmanned operation actuator 17 is operated in the extending direction (cylinder rod projecting direction), the brake pedal 15 can be depressed and unmanned in the release direction based on the loosening operation of the inner wire 28. Further, in the non-braking state in which the unmanned operation actuator 17 is extended, the manned operation of the brake pedal 15 can be permitted based on the bending deformation of the inner wire 28.

  The pedal side connecting member 25 of the present embodiment is attached to the left brake pedal 15a (or the right brake pedal 15b). The left brake pedal 15 a includes a pedal plate 31 and a pedal rubber 32 that is attached to the stepping operation surface of the pedal plate 31. The pedal side connection member 25 is provided on the surface of the plate-like connection member main body 25a, the connection member main body 25a, and is fitted to the pedal plate 31 in a slide shape from the side, and the connection member main body. 25a, and a pin insertion portion 25c through which the pedal connecting pin 26 is inserted in the left-right direction. The pedal side connecting member 25 of the present embodiment is fixed to the pedal plate 31 via a bolt (not shown) and concealed by a pedal rubber 32 attached to the pedal plate 31.

  On the other hand, the wire side connecting member 24 has a wire connecting portion 24a connected to the inner wire 28, and a pair of pin insertion portions 24b extending from the wire connecting portion 24a and having the distal end portion inserted into the pedal connecting pin 26. A plate member having a U-shape in plan view. The wire-side connecting member 24 and the pedal-side connecting member 25 are connected by aligning the hole positions of the pin insertion portions 24b and 25c and inserting the pedal connection pin 26 through the pin insertion portions 24b and 25c.

  The pedal connecting pin 26 is provided on the shaft portion 26a, a flange portion 26b provided on one end side of the shaft portion 26a, and the other end side of the shaft portion 26a, and a retaining member 33 such as a snap pin is detachably mounted. Mounting holes 26c. That is, the pedal connecting pin 26 is inserted into the mounting hole 26c after the shaft portion 26a is inserted into the pin insertion portions 24b and 25c of the wire side connecting member 24 and the pedal side connecting member 25, and then attached to the mounting hole 26c. By connecting the connecting member 24 and the pedal side connecting member 25, while removing the retaining member 33, the shaft portion 26 a is removed from the pin insertion portions 24 b and 25 c of the wire side connecting member 24 and the pedal side connecting member 25. The connection between the wire side connecting member 24 and the pedal side connecting member 25 can be released.

  According to the unmanned operation device 16 configured as described above, the brake pedal 15 and the unmanned operation actuator 17 are switched between the connected state and the unconnected state based on the attachment / detachment of the pedal connection pin 26. In the case where a malfunction occurs, the unmanned operation actuator 17 can be easily disconnected from the brake pedal 15. For example, when the unmanned operation actuator 17 becomes inoperable in the contracted state, the brake pedal 15 is fixed in the depressed operation state, so that the tractor T cannot travel, but the pedal connection pin 26 is removed and the brake pedal 15 is removed. By separating the unmanned operation actuator 17 from the tractor T, the tractor T can travel.

  Next, the arrangement of the unmanned operation actuator 17 and the bracket 29 will be described with reference to the drawings.

  As shown in FIG. 2, the unmanned operation actuator 17 is disposed outside the control unit 7 (cabin 8). According to such an arrangement configuration, it is possible to improve the installability and maintainability of the unmanned operation actuator 17 as compared with the case where the unmanned operation actuator 17 is disposed inside the control unit 7.

  The unmanned operation actuator 17 is disposed outside the control unit 7 (cabin 8) and in front of the control unit 7 (cabin 8). According to such an arrangement, as shown in FIG. 9, the brake pedal 15 and the unmanned operation actuator 17 that are arranged at the front lower portion in the control unit 7 (cabin 8) are arranged close to each other in a side view. Therefore, the connection mechanism 18 can be shortened.

  The unmanned operation actuator 17 is disposed on the left front side of the control unit 7 (cabin 8). According to such an arrangement, an appropriate distance necessary for the wiring of the wire cable 22 is ensured between the brake pedal 15 arranged on the right side in the control unit 7 (cabin 8) and the unmanned operation actuator 17. Since it can do, the wiring of the wire cable 22 becomes easy.

  In addition, the unmanned operation actuator 17 is disposed in front of the left side of the control unit 7 (cabin 8) in a vertically installed posture with the cylinder center along the vertical direction. According to such an arrangement, not only the contact surface of the unmanned operation actuator 17 with the obstacle can be reduced as much as possible, but also the unmanned operation actuator 17 may block the view from the driver seat 14. Can be reduced.

  As shown in FIG. 2, the unmanned operation actuator 17 is attached to the traveling machine body 1 via a bracket 29. The traveling machine body 1 according to the first embodiment includes a connecting member 34 that connects the transmission case 3 and the cabin 8, and the bracket 29 and the unmanned operation actuator 17 are attached using the connecting member 34.

  As shown in FIGS. 7 and 8, the bracket 29 of this embodiment includes a front cover portion 29 a that covers the front portion of the unmanned operation actuator 17 and an inner surface that covers the side surface of the unmanned operation actuator 17 that faces the inside of the machine body. And a cover portion 29b, and is formed in an L shape in plan view so as to open a side portion facing the outside of the machine body of the unmanned operation actuator 17.

  According to such a bracket 29, not only can the unmanned operation actuator 17 be protected from an obstacle that is about to collide with the unmanned operation actuator 17 from the front as the vehicle travels, but also the unmanned operation from the mud that the front wheel 4 scrapes up. The actuator 17 can be protected. Further, since the bracket 29 opens a side surface facing the outside of the machine body of the unmanned operation actuator 17, the unmanned operation actuator 17 can be easily accessed from the outside of the machine body. As a result, the unmanned operation actuator 17 is good. Maintainability can be maintained.

  According to the present embodiment configured as described, the tractor includes the traveling machine body 1, the braking device that brakes the traveling of the traveling machine body 1, and the brake pedal 15 that operates the braking device according to a predetermined operation. T, which includes an unmanned operation actuator 17 that is coupled to the brake pedal 15 via the coupling mechanism 18 and that activates the braking device based on the unmanned operation of the brake pedal 15 via the coupling mechanism 18. Can permit manned operation of the brake pedal 15 even when the unmanned operation actuator 17 and the brake pedal 15 are coupled.

  The coupling mechanism 18 includes an inner wire 28 having flexibility, and unmanned operation of the brake pedal 15 is performed based on a pulling operation by the unmanned operation actuator 17 of the inner wire 28, while braking is performed based on bending of the inner wire 28. Since manned operation of the pedal 15 is allowed, the structure can be simplified and the cost can be reduced as compared with the case where a connecting mechanism having an equivalent function is configured by a link mechanism.

  The connecting mechanism 18 includes a pedal connecting pin 26 that connects the brake pedal 15 and the inner wire 28, and the brake pedal 15 and the unmanned operation actuator 17 are connected and disconnected based on the attachment / detachment of the pedal connecting pin 26. Therefore, the unmanned operation actuator 17 can be easily disconnected from the brake pedal 15 when a failure occurs in the unmanned operation actuator 17.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and change are possible within the range of the summary of this invention described in the claim. Further, in this specification, “unmanned operation” does not mean that the control unit is unmanned, but means a mechanical operation of the braking operation tool by the unmanned operation actuator.

T tractor 1 traveling body 7 control unit 8 cabin 14 driver's seat 15 brake pedal 16 unmanned operation device 17 unmanned operation actuator 18 connection mechanism 22 wire cable 24 wire side connection member 25 pedal side connection member 26 pedal connection pin 27 outer cable 28 inner wire 29 Bracket

Claims (3)

A work vehicle comprising: a traveling machine body; a braking device that brakes traveling of the traveling machine body; and a braking operation tool that operates the braking device according to a predetermined operation,
An unmanned operation actuator that is coupled to the braking operation tool via a coupling mechanism, and that operates the braking device based on an unmanned operation of the braking operation tool via the coupling mechanism;
The work vehicle characterized in that the connection mechanism allows manned operation of the brake operation tool even when the unmanned operation actuator and the brake operation tool are connected.   The coupling mechanism includes a flexible wire, and unmannedly operates the braking operation tool based on a pulling operation of the wire by the unmanned operation actuator. On the other hand, the connection mechanism of the braking operation tool is based on bending of the wire. The work vehicle according to claim 1, wherein manned operation is allowed.   The connection mechanism includes a connection pin that connects the brake operation tool and the wire, and switches the brake operation tool and the unmanned operation actuator between a connected state and a non-connected state based on the attachment / detachment of the connection pin. The work vehicle according to claim 2.

Images