Work vehicle

Abstract

To provide a work vehicle that can achieve space saving.SOLUTION: A work vehicle comprises: an equalizer 552 which distributes driving force from an electric cylinder 540, and transmits the same to wires 553U, 553D; and an adjustment mechanism 560 which is provided on the equalizer 552, and can adjust a fitting position of a driving force transmission member with respect to the equalizer 552. The equalizer 552 comprises a first connection shaft 552b and a second connection shaft 552c to which the wires 553U, 553D are connected. The adjustment mechanism 560 comprises a high nut 561 which can change a connection position of the driving force transmission member with respect to the first connection shaft 552b and the second connection shaft 552c by a prescribed operation.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a technique for a work vehicle equipped with a distribution section that distributes driving force from a drive source and transmits the driving force to a plurality of driving force transmission members. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known a technique for a work vehicle equipped with a distributor that distributes driving force from a driving source and transmits the driving force to a plurality of driving force transmission members, as described in Patent Document 1, for example.

[0003] The tractor described in Patent Document 1 is equipped with an equalizer body that distributes the operating force of a parking brake lever to left and right parking brake wires. The left and right parking brake wires are connected to left and right brake operating arms for operating left and right brake mechanisms.

[0004] Here, a tractor is generally provided with an adjustment mechanism for adjusting the mounting position of the parking brake wire. For this reason, in the tractor of Patent Document 1, it becomes necessary to secure an installation space for the mechanism (equalizer body) that distributes the operating force and an installation space for the adjustment mechanism, and there is a concern that the installation space will increase. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-78612 A Summary of the Invention [Problem to be solved by the invention]

[0006] One aspect of the present disclosure has been made in consideration of the above-mentioned circumstances, and a problem to be solved is to provide a work vehicle that is space-saving. [Means for solving the problem]

[0007] The problem to be solved by one embodiment of the present disclosure has been described above. Next, the means for solving this problem will be described.

[0008] In one aspect of the present disclosure, the device includes a distribution section that distributes a driving force from a driving source and transmits it to a plurality of driving force transmission members, and an adjustment mechanism provided in the distribution section that is capable of adjusting the mounting position of the driving force transmission members relative to the distribution section. According to one aspect of the present disclosure, space can be saved.

[0009] In one aspect of the present disclosure, the distribution section includes a connecting section to which the driving force transmission member is connected, and the adjustment mechanism includes an operating section that can change the connection position of the driving force transmission member relative to the connecting section by a specified operation. According to one aspect of the present disclosure, maintainability can be improved.

[0010] In one aspect of the present disclosure, the operation portion is operable to be rotated to change a connection position of the drive force transmission member relative to the connection portion. According to one aspect of the present disclosure, the connection position can be adjusted with a simple operation, thereby improving maintainability.

[0011] In one aspect of the present disclosure, the driving force transmission member is constituted by a wire, and the operating unit is attached to the wire inserted into the connecting portion, and the connecting position of the wire relative to the connecting portion can be changed by changing the axial mounting position of the wire. According to one aspect of the present disclosure, the adjustment mechanism can have a simple configuration.

[0012] In one aspect of the present disclosure, the distribution section includes a main body section that supports the connecting section and is capable of swinging around a swing axis, and the operating section is arranged to protrude outward from the outer edge of the main body section. According to one aspect of the present disclosure, the main body is less likely to get in the way when adjusting the mounting position, improving maintainability.

[0013] In one aspect of the present disclosure, the drive source is an electric actuator, and the drive force transmission member transmits the drive force distributed by the distribution unit to brake mechanisms of the left and right wheels. According to one aspect of the present disclosure, maintainability can be improved.

[0014] In one aspect of the present disclosure, the fuel cell device further includes a cover member that covers the distributor from at least one of the left and right sides. According to one aspect of the present disclosure, it is possible to prevent mud and the like from adhering to the distributor and the adjustment mechanism.

[0015] In one aspect of the present disclosure, the distributor is disposed between the front wheels and the rear wheels in the front-rear direction. According to one aspect of the present disclosure, the front and rear wheels are less likely to get in the way when adjusting the driving force transmission member, improving maintainability.

[0016] In one aspect of the present disclosure, the distributor is disposed forward of the fuel tank in the front-rear direction. According to one aspect of the present disclosure, the fuel tank is less likely to get in the way when adjusting the driving force transmission member, thereby improving maintainability. Effect of the Invention

[0017] According to one aspect of the present disclosure, maintainability can be improved. [Brief description of the drawings]

[0018] [Figure 1] 1 is a side view showing a tractor according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a side view showing the first operating mechanism and the second operating mechanism. [Diagram 3] Also, plan view. [Figure 4] FIG. [Diagram 5] Also, side view. [Figure 6] Also, plan view. [Figure 7] FIG. [Figure 8] FIG. 4 is a side cross-sectional view showing a second operating mechanism. [Figure 9] FIG. [Figure 10] FIG. 4 is a side view showing a state in which the rod of the electric cylinder is extended. [Figure 11] FIG. 11 is a side cross-sectional view showing how the attachment position of the wire is adjusted. [Figure 12] FIG. 11 is a side view showing a modified example of the second operating mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In the following description, the directions indicated by arrows U, D, F, B, L and R in the figures are defined as upward, downward, forward, backward, leftward and rightward, respectively.

[0020] First, the overall configuration of a tractor 1 according to an embodiment of the present disclosure will be described.

[0021] The tractor 1 shown in FIG. 1 mainly comprises a machine frame 2, an engine 3, a bonnet 4, a transmission case 5, front wheels 6, rear wheels 7, a fender 8, a lifting device 9, a cabin 10, a seat 20, a steering wheel 21, and the like.

[0022] The machine body frame 2 is a frame-like member formed by appropriately combining a plurality of plate materials. The machine body frame 2 is formed in a generally rectangular shape in a plan view. The machine body frame 2 is disposed at the front of the tractor 1 with its longitudinal direction facing the front-rear direction. An engine 3 is fixed to the rear of the machine body frame 2. The engine 3 is covered by a bonnet 4. A transmission case 5 is fixed to the rear of the engine 3. A muffler 4a that discharges exhaust gas from the engine 3 is disposed on the right side of the bonnet 4. In addition, a work light and a headlight are provided on the front of the bonnet 4. The work light and the headlight are provided on both the left and right sides of the front of the bonnet 4 with a gap between them in the left-right direction.

[0023] The front portion of the vehicle frame 2 is supported by a pair of left and right front wheels 6 via a front axle mechanism (not shown). The rear portion of the transmission case 5 is supported by a pair of left and right rear wheels 7 via a rear axle mechanism (not shown). The pair of left and right rear wheels 7 are covered by fenders 8 from roughly above.

[0024] A lifting device 9 is provided at the rear of the transmission case 5. Various types of working equipment (e.g., a tiller) can be attached to the lifting device 9. The lifting device 9 can raise and lower the attached working equipment by an actuator such as a hydraulic cylinder. Power from the engine 3 can be transmitted to the lifting device 9 via a PTO shaft (not shown).

[0025] The power of the engine 3 is changed in speed by a transmission (not shown) housed in a transmission case 5, and then can be transmitted to front wheels 6 via the front axle mechanism, and can be transmitted to rear wheels 7 via the rear axle mechanism. The front wheels 6 and rear wheels 7 are driven to rotate by the power of the engine 3, allowing the tractor 1 to travel. In addition, a working device attached to a lifting device 9 can be driven by the power of the engine 3.

[0026] A cabin 10 is provided behind the engine 3. The cabin 10 is mounted on the vehicle body (transmission case 5, etc.). Inside the cabin 10, a living space is formed for a driver to sit in.

[0027] As shown in Fig. 1, a seat 20 for a driver to sit on is disposed approximately in the center of the cabin 10. The cabin 10 is also provided with an auxiliary step 20a for getting on and off the seat 20. The auxiliary step 20a is provided on at least the left side of the cabin 10. The auxiliary step 20a can be provided on both sides of the cabin 10. A steering wheel 21 for adjusting the turning angle of the front wheels 6 is also disposed in the front of the cabin 10.

[0028] A brake pedal 22 for braking is disposed below the steering wheel 21. By depressing the brake pedal 22, a passenger can apply a braking force corresponding to the amount of operation of the brake pedal 22 to the left and right wheels (for example, the rear wheels 7).

[0029] The cabin 10 is also provided with a parking brake operation unit (not shown) that can be operated by a passenger. The parking brake operation unit is configured with, for example, a switch. By operating the parking brake operation unit, the passenger can switch between a braking state in which braking force is applied to the left and right wheels and a brake release state in which no braking force is applied. A fuel tank 23 is also disposed below the cabin 10.

[0030] The tractor 1 of this embodiment can detect the position of the vehicle body (position information including latitude and longitude) using a GPS or the like, and can execute control to automatically steer the vehicle body based on the position information. The above control includes, for example, control to automatically steer the vehicle body so that the vehicle travels straight parallel to a set predetermined travel reference line, and control to automatically travel the vehicle body along a created target travel route. The tractor 1 can also brake the wheels during automatic travel.

[0031] The following describes the configuration related to the brake of the tractor 1. Specifically, the following describes the brake pedal 22, the brake lever 610, the first operation mechanism 620, the support member 630, the electric cylinder 640, the second operation mechanism 650, the adjustment mechanism 660, and the cover member 670. Note that the illustration of the cover member 670 is omitted in the drawings other than Fig. 1 and Fig. 7.

[0032] A pair of brake pedals 22, one on the left and one on the right, are provided as shown in Figures 2 and 3. The pair of left and right brake pedals 22 are configured to be able to swing in the front-rear direction about a swing shaft 22a whose axial direction faces the left-right direction. The pair of left and right brake pedals 22 are biased rearward by a return spring (not shown). A passenger can operate the pair of left and right brake pedals 22 by depressing them individually.

[0033] The brake lever 610 is for braking the left and right wheels by operating a pair of left and right brake mechanisms B (see FIG. 1). The brake mechanisms B can brake the wheels, for example, by pressing brake pads against a brake disc that rotates integrally with the wheels. Note that the brake mechanism B is not limited to the above-mentioned configuration as long as it is capable of braking the wheels.

[0034] A pair of left and right brake levers 610 are provided corresponding to the pair of left and right brake mechanisms B. The left brake lever 610 can operate the left brake mechanism B. The right brake lever 610 can operate the right brake mechanism B. As shown in FIG. 2, each of the pair of left and right brake levers 610 includes a lever body 611 and an operating shaft 612.

[0035] The lever body 611 is formed in a plate shape with its plate surface facing in the left-right direction. An elongated hole 611a is formed in the lever body 611. The elongated hole 611a penetrates the lever body 611 in the left-right direction. The elongated hole 611a is formed in a generally arc shape with the operating shaft 612 as its center in a side view.

[0036] The operating shaft 612 is disposed with its axis oriented in the left-right direction. The operating shaft 612 is rotatably supported by the vehicle body. An upper end of the lever body 611 is fixed to the operating shaft 612.

[0037] The lever body 611 can swing in the front-rear direction around the operating shaft 612. The pair of left and right brake levers 610 can brake the wheels by operating the pair of left and right brake mechanisms B as the operating shaft 612 rotates with the forward swing of the lever body 611. The lever body 611 is biased backward by a biasing member.

[0038] The first operation mechanism 620 is for operating the brake lever 610 in association with the operation of the brake pedal 22. A pair of first operation mechanisms 620 are provided on the left and right (see FIG. 3). The left first operation mechanism 620 connects the left brake pedal 22 and the left brake lever 610. The right first operation mechanism 620 connects the right brake pedal 22 and the right brake lever 610. The configuration of the first operation mechanism 620 will be described below using the left first operation mechanism 620 as an example. As shown in FIG. 2, the first operation mechanism 620 includes a first brake rod 621, a link mechanism 622, a second brake rod 623, and a hydraulic cylinder 624.

[0039] The first brake rod 621 is a shaft-shaped member whose longitudinal direction is oriented in the vertical direction. An upper end of the first brake rod 621 is connected to the brake pedal 22.

[0040] The link mechanism 622 is for connecting the first brake rod 621 and the second brake rod 623. The link mechanism 622 includes a swing shaft 622a, a first link member 622b, and a second link member 622c. The swing shaft 622a is disposed with its axis oriented in the left-right direction. The first link member 622b and the second link member 622c are swingably supported by the swing shaft 622a. The lower end of the first brake rod 621 is connected to the first link member 622b.

[0041] The second brake rod 623 is an axial member with its longitudinal direction facing the front-rear direction. The front end of the second brake rod 623 is connected to the second link member 622c. More specifically, a mounting portion 623a with a plate surface facing left and right is formed at the front end of the second brake rod 623, and a pin 623c is inserted into an elongated hole 623b formed in the mounting portion 623a and the second link member 622c, thereby connecting the front end of the second brake rod 623 to the second link member 622c. The elongated hole 623b is formed in a straight line extending along the axial direction of the second brake rod 623.

[0042] The hydraulic cylinder 624 is for automatically operating the brake mechanism B when the tractor 1 turns, etc. The hydraulic cylinder 624 is arranged so that the rod 624a faces forward. The rear end of the second brake rod 623 is connected to the rod 624a of the hydraulic cylinder 624. The lever body 611 of the brake lever 610 is connected to the rear end of the hydraulic cylinder 624.

[0043] The first operating mechanism 620 transmits the operating force of the brake pedal 22 to the brake lever 610 in response to depression of the brake pedal 22. Specifically, as shown in Fig. 9, when the brake pedal 22 is depressed, the brake pedal 22 swings about the swing shaft 22a. In response to the swing, the first link member 622b is pulled upward via the first brake rod 621, and the second brake rod 623 is pulled forward via the second link member 622c.

[0044] This causes the brake lever 610 to swing forward, causing the operating shaft 612 to rotate, and actuating the brake mechanism B. In this way, the rider can apply a braking force corresponding to the amount of depression of the brake pedal 22 to the wheels.

[0045] Furthermore, when the tractor 1 turns, the hydraulic cylinder 624 is controlled so as to brake the wheel located on the inside of the turning trajectory. For example, when the tractor 1 turns to the left, the rod 624a of the left hydraulic cylinder 624 is contracted and the left brake lever 610 is swung forward. This brakes the left wheel, making it possible to reduce the turning radius of the tractor 1. In this way, the hydraulic cylinder 624 is used as a single-brake mechanism that brakes one of the left or right wheels.

[0046] 4 and 5 is for supporting an electric cylinder 640 and the like. The support member 630 is formed in a generally plate-like shape with its plate surface facing in the left-right direction. The support member 630 includes a first member 631 and a second member 632. The first member 631 is fixed to the vehicle frame 2. The second member 632 is disposed on the rear side of the first member 631, and is fixed to the transmission case 5.

[0047] The electric cylinder 640 is for operating the pair of left and right brake levers 610. The electric cylinder 640 is supported by the first member 631. The electric cylinder 640 is arranged so that a rod 641 faces rearward. In this embodiment, one electric cylinder 640 is provided for the pair of left and right brake levers 610 (see FIG. 3). The electric cylinder 640 is configured to be operable by power supply from a power source (for example, a battery in the bonnet 4). An operation signal corresponding to the operation of the parking brake operation unit described above and a control signal during automatic travel of the tractor 1 are input to the electric cylinder 640. The electric cylinder 640 can extend and retract the rod 641 in response to the signal.

[0048] The second operating mechanism 650 is for operating the brake lever 610 in accordance with the extension and contraction of the rod 641. The second operating mechanism 650 connects one electric cylinder 640 and the pair of left and right brake levers 610. The second operating mechanism 650 is equipped with a link mechanism 651, an equalizer 652, and wires 653U·653D.

[0049] The link mechanism 651 is for connecting the electric cylinder 640 and the equalizer 652. The link mechanism 651 includes a rotating shaft 651a, a first link member 651b, and a second link member 651c.

[0050] The rotation shaft 651a is disposed with its axis directed in the left-right direction (a direction perpendicular to the extension / contraction direction of the rod 641).

[0051] The first link member 651b is formed in a plate shape with its plate surface facing in the left-right direction, and is rotatably supported by the rotation shaft 651a. As shown in Fig. 8, the first link member 651b includes a first extending portion 651d and a second extending portion 651e.

[0052] The first extending portion 651d is formed so as to extend downward from the rotating shaft 651a in side view. The rod 641 of the electric cylinder 640 is connected to the tip end (lower end) of the first extending portion 651d. The second extending portion 651e is formed so as to extend upward from the rotating shaft 651a in side view.

[0053] 4 and 5 is formed in a plate shape with its plate surface facing in the left-right direction, and is rotatably supported by the rotation shaft 651a. The second link member 651c is formed in the same shape as the second extension portion 651e (see FIG. 8) of the first link member 651b. The second link member 651c is disposed to the left of the second extension portion 651e.

[0054] The equalizer 652 distributes and transmits the thrust of the electric cylinder 640 to the pair of left and right brake levers 610. The equalizer 652 is disposed between the front wheel 6 and the rear wheel 7 shown in FIG. 1 in the front-rear direction. The equalizer 652 is also disposed forward of the fuel tank 23. As shown in FIG. 8, the equalizer 652 includes a main body 652a, a first connecting shaft 652b, and a second connecting shaft 652c.

[0055] The main body 652a is formed in a plate shape with the plate surface facing the left-right direction. A pair of the main body 652a is provided on the left and right. The main body 652a is disposed between the first link member 651b and the second link member 651c in the left-right direction (see Figs. 4 and 6). The main body 652a, the first link member 651b, and the second link member 651c are connected to each other by a pin 652d. The main body 652a, the first link member 651b, and the second link member 651c can rotate around the rotation shaft 651a in accordance with the extension and contraction of the rod 641 of the electric cylinder 640. The main body 652a can also rotate relatively to the first link member 651b, etc., around the pin 652d.

[0056] The first connecting shaft 652b is a portion to which the upper wire 653U is connected. The first connecting shaft 652b is disposed with its axis oriented in the left-right direction. The first connecting shaft 652b is supported by a pair of left and right main body portions 652a.

[0057] The second connecting shaft 652c is a portion to which the lower wire 653D is connected. The second connecting shaft 652c is disposed with its axis oriented in the left-right direction. The second connecting shaft 652c is supported by a pair of left and right main body portions 652a. The second connecting shaft 652c is disposed below the first connecting shaft 652b.

[0058] The wires 653U and 653D shown in Figs. 2, 3 and 8 are for transmitting the thrust of the electric cylinder 640 to the pair of left and right brake levers 610. The wires 653U and 653D connect the equalizer 652 to the pair of left and right brake levers 610. As shown in Fig. 8, the wires 653U and 653D have male threads 653a. The male threads 653a are formed on the front ends of the wires 653U and 653D. The male threads 653a of the wire 653U are inserted into the first connecting shaft 652b. The male threads 653a of the wire 653D are inserted into the second connecting shaft 652c. A nut 662 or the like of an adjustment mechanism 660 (described later) is fastened to the male thread portion 653a, whereby the front ends of the wires 653U to 653D are connected to a first connecting shaft 652b and a second connecting shaft 652c of the equalizer 652.

[0059] 2 and 3, rear end portions of the wires 653U and 653D are connected to lever bodies 611 of a pair of left and right brake levers 610. More specifically, mounting portions 653b with plate surfaces facing left and right are formed at the rear end portions of the wires 653U and 653D, and a pin 653c is inserted into the mounting portion 653b and an elongated hole 611a of the lever body 611, thereby connecting the rear end portions of the wires 653U and 653D to the lever body 611. In this embodiment, the upper wire 653U is connected to the right lever body 611, and the lower wire 653D is connected to the left lever body 611.

[0060] In this way, the first operating mechanism 620 and the second operating mechanism 650 are each connected in parallel to the brake lever 610. More specifically, the first operating mechanism 620 and the second operating mechanism 650 are directly connected to the brake lever 610 without any (common member) therebetween.

[0061] 8 is for adjusting the attachment positions of the wires 653U and 653D relative to the equalizer 652. The adjustment mechanism 660 is provided on the equalizer 652. The adjustment mechanism 660 includes a height nut 661 and a nut 662.

[0062] The high nut 661 is a part for performing an operation to adjust the mounting positions of the wires 653U and 653D. The high nut 661 is screwed onto the male threaded portions 653a of the wires 653U and 653D, respectively. The high nut 661 is pulled rearward by the wires 653U and 653D and abuts against the first connecting shaft 652b and the second connecting shaft 652c via the washer 661a. In this way, the high nut 661 is held (attached) to the first connecting shaft 652b and the second connecting shaft 652c. The high nut 661 is disposed so as to protrude forward from the outer edge of the main body portion 652a of the equalizer 652.

[0063] The nut 662 is for fixing the high nut 661. The nut 662 is screwed onto the male thread portion 653a, and is disposed in front of the high nut 661.

[0064] 7 is a plate-like member that covers the electric cylinder 640, the link mechanism 651, the equalizer 652, and the adjustment mechanism 660. The cover member 670 is formed in a substantially box-like shape that opens to the right. The cover member 670 includes a side plate portion 671 that covers the left side of the electric cylinder 640 etc., a bottom portion 672 that covers the lower side, a top portion 673 that covers the upper side, a front plate portion 674 that covers the front, and a rear plate portion 675 that covers the rear. The rear plate portion 675 is formed with a cutout portion 675a ​​through which the wires 653U-653D can be inserted.

[0065] The cover member 670 is fixed to the support member 630 (see FIG. 5) by fixing members such as bolts. By covering the electric cylinder 640 and the like with the cover member 670 in this manner, it is possible to prevent mud and the like from adhering to the electric cylinder 640 and the like.

[0066] The following describes the operation of the second operating mechanism 650. The following also describes the operation of the second operating mechanism 650, taking as an example a case in which the rod 641 shown in Figures 2 and 5 is extended. Figures 2 and 5 show the second operating mechanism 650 in a state in which the brake lever 610 is swung rearward and the wheel is not braked (braking released state).

[0067] 2 and 5 is extended, the first link member 651b, the second link member 651c, and the main body 652a of the equalizer 652 rotate about the rotation shaft 651a. This pulls the wires 653U and 653D forward, and the thrust of the electric cylinder 640 is distributed to the wires 653U and 653D.

[0068] 10, when the wires 653U and 653D are pulled, the pair of left and right brake levers 610 are swung forward to rotate the operating shaft 612, thereby operating the pair of left and right brake mechanisms B. This makes it possible to switch to a braking state in which braking forces are applied to the left and right wheels.

[0069] When the rod 641 of the electric cylinder 640 contracts, the second operating mechanism 650 operates in the opposite manner to when the rod 641 is extended. This allows the second operating mechanism 650 to swing the brake lever 610 backward, and switch to a brake release state in which application of braking force to the wheels is released.

[0070] Here, in this embodiment, as shown in an enlarged view in FIG. 10, the second brake rod 623 is connected to the second link member 622c via a long hole 623b and a pin 623c formed in the second brake rod 623. Therefore, when the pair of left and right brake levers 610 are swung forward by the operation of the electric cylinder 640, the second brake rod 623 is moved forward. However, since the pin 623c inserted into the second link member 622c slides in the long hole 623b of the second brake rod 623, it is possible to prevent the second link member 622c from rotating with the movement of the second brake rod 623. In this way, it is possible to suppress the thrust of the electric cylinder 640 from being transmitted to the brake pedal 22.

[0071] 9, the wires 653U, 653D are connected to the brake lever 610 via a long hole 611a and a pin 653c formed in the lever body 611. Therefore, when the brake pedal 22 is depressed, the brake lever 610 is swung forward. However, the pin 653c through which the wires 653U, 653D are inserted slides within the long hole 611a of the brake lever 610, preventing the wires 653U, 653D from moving forward as the brake lever 610 moves. In this way, the operating force of the brake pedal 22 can be prevented from being transmitted to the electric cylinder 640.

[0072] In this manner, in this embodiment, the transmission of power from the first operation mechanism 620 to the second operation mechanism 650 is blocked by the long hole 611a and the pin 653c (see FIG. 9), and the transmission of power from the second operation mechanism 650 to the first operation mechanism 620 is blocked by the long hole 623b and the pin 623c (see FIG. 10). The long holes 611a-623b and the pins 623c-653c are independence mechanisms that enable the first operation mechanism 620 and the second operation mechanism 650 to operate independently of each other.

[0073] By providing an independent mechanism in this way, usability can be improved. For example, the brake pedal 22 can be depressed in the braking state shown in Fig. 10 (a state in which a braking force is applied to the wheels by operating the parking brake operation unit, etc.). Therefore, the rider can release the braking state by the electric cylinder 640 while depressing the brake pedal 22, and can use the brake pedal 22 to brake the wheels even after the braking state is released. This makes it possible to prevent the tractor 1 from moving unintentionally by the rider.

[0074] Furthermore, in this embodiment, in response to operation of the parking brake operation unit, the electric cylinder 640 operates instead of the hydraulic cylinder 624. This makes it possible to brake the wheels even if the engine 3 is not running.

[0075] 5, in this embodiment, the rod 641 of the electric cylinder 640 is not directly connected to the equalizer 652, but the rod 641 and the equalizer 652 are connected via a rotatable first link member 651b or the like. This makes it possible to adjust the operating force and operating speed of the brake lever 610 accompanying the expansion and contraction of the electric cylinder 640. For example, by making the distance from the rotation shaft 651a to the rod 641 relatively long, the operating force of the brake lever 610 can be increased. Also, for example, by making the distance from the rotation shaft 651a to the rod 641 relatively short, the operating speed of the brake lever 610 can be increased.

[0076] Here, differences in the pull lengths of the wires 653U and 653D may occur due to changes in the state of the pair of left and right brake mechanisms B. For example, if the right brake mechanism B (brake disc, etc.) is more worn than the left, the pull length of the upper wire 653U connected to the right brake mechanism B may become larger than the lower wire 653D.

[0077] If there is a difference in the pull amount of the wires 653U and 653D, the main body 652a of the equalizer 652 rotates about the pin 652d. For example, if the pull amount of the upper wire 653U is greater than that of the lower wire 653D, the equalizer 652 rotates counterclockwise when viewed from the left side about the pin 652d. This absorbs the difference in the pull amount of the wires 653U and 653D and allows equal braking force to be applied to the left and right wheels.

[0078] Furthermore, in this embodiment, the difference in the pulling allowance of the wires 653U and 653D can be adjusted by using the adjustment mechanism 660. Specifically, when the nut 662 of the adjustment mechanism 660 shown in FIG.

[0079] In this state, the rider can rotate the high nut 661 to move the male threaded portion 653a of the wires 653U, 653D forward and backward relative to the first connecting shaft 652b and the second connecting shaft 652c. In addition, by fastening the nut 662 at a predetermined forward and backward position, the wires 653U, 653D can be fixed at that forward and backward position. This allows the adjustment mechanism 660 to change the connecting position of the male threaded portion 653a to the first connecting shaft 652b and the second connecting shaft 652c (the mounting position of the wires 653U, 653D to the equalizer 652).

[0080] If the pulling allowance of the upper wire 653U becomes larger than that of the lower wire 653D, the pulling allowance of the upper wire 653U can be reduced by moving the upper male screw portion 653a forward using the procedure described above.

[0081] Moreover, the adjustment mechanism 660 is provided in the equalizer 652. With this configuration, the adjustment mechanism 660 can be installed using the installation space of the equalizer 652, thereby saving space. Furthermore, the adjustment of the wires 653U and 653D and the maintenance of the equalizer 652 can be performed in the same place, improving maintainability.

[0082] Furthermore, the equalizer 652 is attached to the support member 630 via the link mechanism 651. By attaching the electric cylinder 640, the link mechanism 651, and the equalizer 652 to a common member (the support member 630) in this manner, the electric cylinder 640 and the equalizer 652 can be assembled to the vehicle body in a state where they are attached to the support member 630, and the workability of the assembly work can be improved.

[0083] As described above, the tractor 1 (work vehicle) according to this embodiment is equipped with the brake lever 610 capable of activating the brake mechanism B when operated in a predetermined direction, a first operation mechanism 620 (manual operation mechanism) that connects the brake lever 610 to the brake pedal 22 (brake operation tool) that can be operated by a rider, and is capable of operating the brake lever 610 in conjunction with the operation of the brake pedal 22, a second operation mechanism 650 (electric operation mechanism) that connects the electric cylinder 640 (electric actuator) and the brake lever 610, and is capable of operating the brake lever 610 in conjunction with the operation of the electric cylinder 640, and an independent mechanism (long holes 611a-623b and pins 623c-653c) that prevents either the first operation mechanism 620 or the second operation mechanism 650 from operating in conjunction with the operation of the other one of the first operation mechanism 620 and the second operation mechanism 650 (see FIGS. 2, 9, and 10).

[0084] By configuring in this manner, in a tractor 1 having a plurality of operating mechanisms (first operating mechanism 620 and second operating mechanism 650) capable of operating the brake mechanism B, interference between the operating mechanisms can be prevented.

[0085] Moreover, the first operating mechanism 620 and the second operating mechanism 650 are connected in parallel to the brake lever 610.

[0086] With this configuration, interference between the first operating mechanism 620 and the second operating mechanism 650 connected in parallel to the brake lever 610 can be prevented.

[0087] The independent mechanism further includes a long hole 623b (manual side long hole) formed in either one of the second link member 622c (manual side first member) which operates in conjunction with the brake pedal 22 or the second brake rod 623 (manual side second member) which operates in conjunction with the brake lever 610, and a pin 623c (manual side connecting portion) provided in the other of the second link member 622c or the second brake rod 623 and inserted into the long hole 623b (see Figures 2 and 10).

[0088] With this configuration, interference between a plurality of operating mechanisms can be prevented with a simple configuration (long hole 623b).

[0089] The independent mechanism further includes a long hole 611a (electric side long hole) formed in either one of the wires 653U, 653D (electric side first member) that operate in conjunction with the electric cylinder 640, or a lever body 611 (electric side second member) that operates in conjunction with the brake lever 610, and a pin 653c (electric side insertion portion) provided in the other of the wires 653U, 653D, or the lever body 611, and inserted into the long hole 611a (see Figures 2 and 9).

[0090] With this configuration, it is possible to prevent interference between a plurality of operating mechanisms with a simple configuration (long hole 611a).

[0091] The independent mechanism further includes an elongated hole 623b formed in either one of a second link member 622c which operates in conjunction with the brake operating device or a second brake rod 623 which operates in conjunction with the brake lever 610, a pin 623c provided in the other of the second link member 622c or the second brake rod 623 and inserted into the elongated hole 623b, an elongated hole 611a formed in either one of wires 653U / 653D which operate in conjunction with the electric cylinder 640 or a lever body 611 which operates in conjunction with the brake lever 610, and a pin 653c provided in the other of the wires 653U / 653D or the lever body 611 and inserted into the elongated hole 611a (see FIGS. 2, 9 and 10).

[0092] With this configuration, it is possible to prevent interference between a plurality of operating mechanisms with a simple configuration (long hole 611a).

[0093] Further, the brake levers 610 are provided in a pair on the left and right to correspond to a pair of left and right brake mechanisms B for braking the left and right wheels, respectively, and the second operating mechanism 650 connects the single electric cylinder 640 and the pair of left and right brake levers 610 (see FIG. 3).

[0094] With this configuration, the pair of left and right brake mechanisms B can be operated simultaneously by one electric cylinder 640.

[0095] In addition, the second operating mechanism 650 includes a first link member 651b and a second link member 651c (rotating members) that can rotate around a rotating shaft 651a in response to the driving force of the electric cylinder 640, and an equalizer 652 (distribution section) that distributes and transmits the driving force (thrust) of the electric cylinder 640 transmitted via the first link member 651b and the second link member 651c to a pair of left and right brake levers 610 (see Figures 2 and 10).

[0096] By configuring it in this manner, the shape of the first link member 651b and the second link member 651c (such as the dimensions from the center of rotation to the connection part with the electric cylinder 640 and the equalizer 652) can be appropriately set, thereby making it possible to adjust the operating force and operating speed of the brake lever 610 by the electric cylinder 640.

[0097] The electric cylinder 640 is provided with an extendable rod 641, and the axial direction (left-right direction) of the rotating shaft 651a is oriented perpendicular to the extension direction (front-back direction) of the rod 641 (see FIG. 11).

[0098] With this configuration, it is possible to directly connect the electric cylinder 640 (rod 641) and the first link member 651b, etc., without providing a mechanism for changing the transmission direction of the driving force, thereby simplifying the configuration.

[0099] As described above, the tractor 1 (work vehicle) of this embodiment is equipped with an equalizer 652 (distribution section) that distributes driving force from the electric cylinder 640 (driving source) and transmits it to a plurality of driving force transmission members (wires 653U, 653D), and an adjustment mechanism 660 that is provided on the equalizer 652 and is capable of adjusting the mounting position of the driving force transmission members relative to the equalizer 652.

[0100] With this configuration, the equalizer 652 and the adjustment mechanism 660 can be installed in a common space, thereby saving space and improving maintainability.

[0101] The equalizer 652 has a first connecting shaft 652b and a second connecting shaft 652c (connecting portion) to which the driving force transmission members (wires 653U, 653D) are connected, and the adjustment mechanism 660 has a high nut 661 (operating portion) that can change the connection position of the driving force transmission members relative to the first connecting shaft 652b and the second connecting shaft 652c by a predetermined operation (see Figure 11).

[0102] Such a configuration can improve maintainability.

[0103] Furthermore, the high nut 661 can be rotated to change the connection positions of the driving force transmission members (wires 653U and 653D) with respect to the first connecting shaft 652b and the second connecting shaft 652c (see FIG. 11).

[0104] With this configuration, the connection position can be adjusted with a simple operation, and maintainability can be improved.

[0105] In addition, the driving force transmission member is composed of wires 653U·653D, and the high nut 661 is attached to the wires 653U·653D inserted through the first connecting shaft 652b and the second connecting shaft 652c, and by changing the axial mounting position of the wires 653U·653D, the connection position of the wires 653U·653D relative to the high nut 661 can be changed (see Figure 11).

[0106] With this configuration, the adjustment mechanism 660 can be simply configured.

[0107] The equalizer 652 supports the first connecting shaft 652b and the second connecting shaft 652c and includes a main body portion 652a that is swingable around a swing shaft 622a, and the high nut 661 is arranged so as to protrude outward from the outer edge of the main body portion 652a (see FIG. 11).

[0108] With this configuration, the main body 652a is unlikely to get in the way when adjusting the mounting position, and the adjustment can be performed efficiently, thereby improving maintainability.

[0109] In addition, the driving source is an electric cylinder 640 (electric actuator), and the driving force transmission member (wires 653U·653D) transmits the driving force distributed by the equalizer 652 to the brake mechanisms B of the left and right wheels (see Figures 2 and 3).

[0110] With this configuration, the mechanism (second operating mechanism 650) that connects the electric cylinder 640 and the brake mechanism B can be made easier to maintain.

[0111] Moreover, the tractor 1 further includes a cover member 670 that covers the equalizer 652 from at least one of the left and right sides (see FIG. 7).

[0112] With this configuration, it is possible to prevent mud and the like from adhering to the equalizer 652 and the adjustment mechanism 660.

[0113] Moreover, the equalizer 652 is disposed between the front wheels 6 and the rear wheels 7 in the front-rear direction.

[0114] By configuring in this manner, the front wheels 6 and the like are less likely to get in the way when adjusting the mounting position, and maintenance can be improved.

[0115] Moreover, the equalizer 652 is disposed forward of the fuel tank 23 in the front-rear direction.

[0116] With this configuration, the fuel tank 23 is less likely to get in the way when adjusting the mounting position, and maintainability can be improved.

[0117] The tractor 1 according to this embodiment is one embodiment of a work vehicle. The brake pedal 22 according to this embodiment is one embodiment of a brake operation tool. Moreover, the first operating mechanism 620 according to this embodiment is one embodiment of a manual operating mechanism. Moreover, the electric cylinder 640 according to this embodiment is one embodiment of an electric actuator and a drive source. Moreover, the second operating mechanism 650 according to this embodiment is one embodiment of an electric operating mechanism. Moreover, the elongated holes 623b, 651a and the pins 623c, 653c according to this embodiment are one embodiment of an independent mechanism. Moreover, the second link member 622c according to this embodiment is one embodiment of the manual side first member. Moreover, the second brake rod 623 according to this embodiment is one embodiment of the manual side second member. Moreover, the long hole 623b according to this embodiment is one embodiment of a manual side long hole. Moreover, the pin 623c according to this embodiment is one embodiment of a manual side coupling portion. Moreover, the wires 653U and 653D according to this embodiment are an embodiment of an electric motor side first member and a driving force transmission member. Furthermore, the lever body 611 according to this embodiment is one embodiment of the electric-side second member. Moreover, the long hole 611a according to this embodiment is one embodiment of an electric motor side long hole. The pin 653c according to this embodiment is one embodiment of an electric motor side connector. Moreover, the first link member 651b and the second link member 651c according to this embodiment are an embodiment of a rotating member. Moreover, the equalizer 652 according to the present embodiment is an embodiment of a distribution section. Moreover, the first connecting shaft 652b and the second connecting shaft 652c according to this embodiment are an embodiment of a connecting portion. Moreover, the high nut 661 according to this embodiment is one embodiment of an operating portion.

[0118] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0119] For example, the work vehicle according to the present embodiment is a tractor 1, but the type of work vehicle according to the present invention is not limited to this. The work vehicle according to the present invention may be other agricultural vehicles, construction vehicles, industrial vehicles, etc.

[0120] In addition, in this embodiment, the brake lever 610 is operated by the electric cylinder 640, but the type of electric actuator is not limited to the electric cylinder 640, and may be other devices (such as an electric motor) that are driven by the supply of electricity.

[0121] In this embodiment, the long hole 623b is formed in the second brake rod 623 (see FIG. 2), but the member in which the long hole 623b is formed is not limited to the second brake rod 623. The long hole 623b may be formed in any member as long as it is formed in a path through which the operating force is transmitted from the brake pedal 22 to the brake lever 610. For example, the long hole 623b may be formed in the first brake rod 621, the second link member 622c, etc.

[0122] In this embodiment, the long hole 611a is formed in the lever body 611, but the member in which the long hole 611a is formed is not limited to the lever body 611. The long hole 611a may be formed in any part of the path through which thrust is transmitted from the electric cylinder 640 to the brake lever 610. For example, the long hole 611a may be formed in the attachment parts 653b of the wires 653U·653D, etc.

[0123] In addition, in this embodiment, the first operating mechanism 620 and the second operating mechanism 650 operate independently of each other by the long holes 623b / 611a and the pins 623c / 653c, but the configuration of the mechanism (independent mechanism) that operates each operating mechanism 620 / 650 independently is not limited to the long holes 623b / 611a and the pins 623c / 653c.

[0124] Furthermore, the independent mechanism is configured by a part of the first operating mechanism 620 and the second operating mechanism 650 (slot 623b, pin 653c, etc.), but it may be configured by a member separate from each of the operating mechanisms 620, 660.

[0125] In this embodiment, the pair of left and right brake levers 610 are operated by one electric cylinder 640, but the correspondence between the electric cylinder 640 and the brake lever 610 is not limited to this. For example, it is also possible to operate the pair of left and right brake levers 610 by the left and right electric cylinders 640, respectively. An example of this configuration will be described below with reference to FIG. 12.

[0126] The electric cylinder 640 shown in FIG. 12 is provided in a pair on the left and right so as to correspond to the pair on the left and right brake levers 610. Of the pair on the left and right, only the left electric cylinder 640 and the left operation mechanism (first operation mechanism 620, etc.) are shown in FIG. 12, but in reality, the right electric cylinder 640 and operation mechanism are disposed to the right of the left electric cylinder 640 (for example, on the right side of the vehicle body). The configuration of the electric cylinder 640 will be described below using the left electric cylinder 640 as an example. The electric cylinder 640 is disposed so that the rod 641 faces rearward. A plate-shaped mounting portion 642a is formed at the tip of the rod 641. The mounting portion 642a is formed with a long hole 642b having a substantially arc-shaped shape in side view centered on the swing shaft 622a.

[0127] The second operation mechanisms 750 are provided in a pair on the left and right, and connect the pair of left and right electric cylinders 640 and the pair of left and right link mechanisms 622. The second operation mechanisms 750 include a connecting member 751. The connecting member 751 is formed in a plate shape with its plate surface facing in the left-right direction, and is supported swingably on the swing shaft 622a. The first link member 622b, the second link member 622c, and the connecting member 751 are configured to be swingable together.

[0128] Furthermore, the pin 752 is inserted through the connecting member 751 and the long hole 642b of the mounting portion 642a, thereby connecting the connecting member 751 and the rod 641 to each other.

[0129] Also, the first brake rod 621 is connected to the first link member 622b via a long hole 621b. In Fig. 12, the long hole 621b is formed in the mounting portion 621a of the first brake rod 621, and a pin 621c is inserted into the long hole 621b and the first link member 622b. Note that the long hole 621b may be formed in the first link member 622b instead of the first brake rod 621.

[0130] Further, the second brake rod 623 is connected to the second link member 622c without passing through a long hole.

[0131] 12, when the brake pedal 22 is operated, the second link member 622c can be swung in association with the swing of the first link member 622b. At this time, the pin 752 inserted into the connecting member 751 slides in the long hole 642b of the rod 641, so that the transmission of power from the brake pedal 22 to the electric cylinder 640 is interrupted. Also, when the rod 641 expands and contracts, the second link member 622c can be swung in association with the swing of the connecting member 751. At this time, the pin 621c inserted into the first link member 622b slides in the long hole 621b of the first brake rod 621, so that the transmission of power from the electric cylinder 640 to the brake pedal 22 is interrupted.

[0132] In this way, even when a pair of left and right electric cylinders 640 are provided corresponding to a pair of left and right brake mechanisms B, respectively, the first operating mechanism 620 and the second operating mechanism 650 can be operated independently by the long holes 621b, 642b and the pins 621c, 752.

[0133] Furthermore, by individually controlling the left and right electric cylinders 640, it is possible to provide the function of the hydraulic cylinder 624 (see FIG. 2) of this embodiment. For example, when the tractor 1 turns left, the rod 641 of the left electric cylinder 640 is contracted to operate the left brake mechanism B. This brakes the left wheel, making it possible to reduce the turning radius of the tractor 1. With this configuration, the hydraulic cylinder 624 can be omitted.

[0134] As described above, a pair of brake levers 610 are provided on the left and right sides to correspond to the brake mechanisms B of the left and right wheels, respectively, and two second operating mechanisms 650 are provided to correspond to the pair of left and right brake levers 610.

[0135] With this configuration, the second operating mechanism 650 can be used as a one-brake mechanism when turning the tractor 1.

[0136] Further, the adjustment mechanism 660 adjusts the attachment positions of the wires 653U, 653D by the high nut 661 (see FIG. 11). However, it is also possible to adjust the attachment positions of the wires 653U, 653D by a member other than the high nut 661.

[0137] Further, the electric cylinder 640, the equalizer 652, and the wires 653U and 653D are used to operate the brake mechanism B, but the electric cylinder 640 and the like can also be used for purposes other than braking.

[0138] In the present embodiment, the equalizer 652 is used to distribute the thrust of the electric cylinder 640, but the equalizer 652 can be used for other purposes. For example, the equalizer 652 can be used for any purpose, such as distributing the power of an electric motor or the operating force of an operating tool by a passenger.

[0139] In the present embodiment, the driving force is distributed from the equalizer 652 to the wires 653U and 653D, but the members to which the driving force is distributed from the equalizer 652 are not limited to the wires 653U and 653D. For example, the driving force may be distributed from the equalizer 652 to a rod or the like.

[0140] Although the equalizer 652 is disposed between the front wheels 6 and the rear wheels 7 in the front-rear direction, the positional relationship between the front wheels 6 and the rear wheels 7 in the front-rear direction is not limited to this embodiment. Although the equalizer 652 is disposed forward of the fuel tank 23, the positional relationship between the fuel tank 23 in the front-rear direction is not limited to this embodiment.

[0141] In addition, the high nut 661 is assumed to protrude forward from the main body 652a of the equalizer 652, but the protruding direction with respect to the main body 652a is not limited to the forward direction, and the high nut 661 may protrude in other directions. In addition, the high nut 661 does not necessarily have to protrude from the main body 652a.

[0142] Furthermore, the high nut 661 is connected to the first connecting shaft 652b and the second connecting shaft 652c, but it may be connected to a member (such as the main body portion 652a) other than the first connecting shaft 652b and the second connecting shaft 652c.

[0143] In addition, the cover member 670 covers the adjustment mechanism 660 and the like from above, below, the front, the rear, and the left, but the cover member 670 only needs to cover the adjustment mechanism 660 and the like from at least one of the left and right sides. Also, the cover member 670 may be omitted. [Explanation of symbols]

[0144] 1 Tractor 540 Electric Cylinder 552 Equalizer 553U·553D Wire 560 Adjustment mechanism

Claims

1. a distributor that distributes a driving force from a driving source and transmits the driving force to a plurality of driving force transmission members; an adjustment mechanism provided in the distribution section and capable of adjusting a mounting position of the driving force transmission member with respect to the distribution section; A work vehicle equipped with:

2. The distribution unit includes: a coupling portion to which the driving force transmission member is coupled, The adjustment mechanism includes: The drive force transmission member may be connected to the connecting portion by a predetermined operation. A work vehicle according to claim 1.

3. The operation unit includes: By being rotated, the connection position of the driving force transmission member with respect to the connection portion can be changed. The work vehicle according to claim 2.

4. The driving force transmission member is It is composed of wire, The operation unit includes: The wire is attached to the connecting portion, and the connecting position of the wire with respect to the connecting portion can be changed by changing the attachment position of the wire in the axial direction. The work vehicle according to claim 2.

5. The distribution unit includes: A main body portion supports the connecting portion and is swingable about a swing axis, The operation unit includes: It is arranged so as to protrude outward from the outer edge of the main body. The work vehicle according to claim 2.

6. The driving source is It is an electric actuator, The driving force transmission member is The driving force distributed by the distribution unit is transmitted to brake mechanisms of the left and right wheels. A work vehicle according to any one of claims 1 to 5.

7. Further comprising a cover member that covers the distributor from at least one of the left and right sides. A work vehicle according to claim 1.

8. The distribution unit includes: Located between the front and rear wheels in the front-rear direction. A work vehicle according to claim 1.

9. The distribution unit includes: Located forward of the fuel tank in the fore-and-aft direction. A work vehicle according to claim 1.

Images