JP6634865B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle.

  2. Description of the Related Art Conventionally, in a work vehicle (for example, an agricultural tractor), a control device for controlling a posture of a work machine connected to a rear portion of the vehicle body with respect to the vehicle body, and a left-right inclination angle (hereinafter, referred to as a “roll angle”) of the vehicle body are detected. It has been known that a posture of a work machine is automatically controlled based on a detected value of a tilt sensor by connecting the tilt sensor to a tilt sensor.

  Here, the tilt sensor is provided, for example, on one of the left and right sides of the vehicle body, and is located at a position apart from a control device provided on the rear portion of the vehicle body (for example, see Patent Document 1).

JP-A-7-241102

  However, in the conventional work vehicle as described above, since the inclination sensor and the control device are separated from each other, wiring such as a wire harness connecting both devices becomes long, and wiring is complicated, and assembly is difficult. Had become difficult. These have been factors that increase the manufacturing cost.

  The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle capable of reducing manufacturing costs.

In order to solve the above-mentioned problem and achieve the object, a work vehicle according to claim 1, wherein a work machine (50) is connected to a rear part of the work machine so as to be able to roll, and the work vehicle (2) A) a roll angle detecting device (30) provided at a rear portion of the traveling vehicle body (2) for detecting a roll angle of the traveling vehicle body (2); and a rear portion of the traveling vehicle body (2) provided near the roll angle detecting device (30). A posture control device (40) for controlling a rolling posture of the work machine (50) with respect to the traveling vehicle body (2) based on a detection value of the roll angle detection device (30 ); A work machine support member (22) provided at a rear portion and supporting the work machine (50) and tilting together with rolling of the work machine (50); Inclination angle of work equipment support member (22) The left and right rear frames (16, 16) are provided above the left and right rear frames (16, 16) respectively supporting the left and right rear fenders (11, 11) from below. A center frame (23) bridged therebetween, and the roll angle detection device (30) is provided directly above the center frame (23) and has a cover (35) covering a rear surface, The attitude control device (40) is provided directly below the center frame (23) and has a cover (45) that covers a rear surface. The tilt angle detection device (70) is provided with the attitude control device (40). ) provided directly under the, a cover (75) covering the rear surface, the cover of the roll angle detecting unit (30) (35) further has a license plate attachment portion (36) to the rear face And wherein the door.

Working vehicle according to claim 2, in the working vehicle according to claim 1, or provided on one of the left and right lift arms for lifting the working machine (50) (101), said working machine (50) And a lower position of a cockpit (7) disposed between the left and right rear fenders (11, 11) for driving the lifting arm (101). An elevating cylinder case (102) for accommodating the elevating cylinder (104), and provided on one of the left and right sides of the elevating cylinder case (102), and are electronically controlled to be fed to the posture changing cylinder (24). A valve (27) for adjusting pressure oil, and a clamp provided on the center frame (23) for fixing a wiring connecting the valve (27) and the attitude control device (40). (26) and characterized in that it further comprises a.

The work vehicle according to a third aspect is the work vehicle according to the second aspect , wherein the work vehicle is provided on one of the left and right sides of the lifting cylinder case (102), and adjusts a lowering speed of the work machine (50). The apparatus further includes a descending speed adjusting device (100), wherein the valve (27) is provided on the same side of the elevating cylinder case (102) where the descending speed adjusting device (100) is provided. .

  According to the work vehicle of the first aspect, the roll angle detection device and the attitude control device are concentrated on the rear portion of the traveling vehicle body, so that wiring such as a wire harness can be easily arranged. Thereby, the ease of assembly can be improved. Further, the roll angle detection device and the attitude control device can be connected with a short wiring, and the cost of parts can be reduced. Further, the manufacturing cost can be reduced by improving the ease of assembly and reducing the cost of parts.

Further, according to the working vehicle according to claim 1, after which the working machine supporting member angle of inclination a simple configuration can detect a rolling posture of the work by detecting device, the inclination angle detection device and orientation The wiring of the wiring is facilitated due to the close proximity to the control device, and the ease of assembly can be improved. Further, since the wiring connecting the inclination angle detection device and the attitude control device can be short, the cost of parts can be reduced.

Further, according to the working vehicle according to claim 1, b Lumpur angle detection device, the posture control device and an inclination angle detection device, at the rear of the vehicle body is concentrated in the vicinity of the center frame, and the surface is covered after each By being covered with, it is possible to prevent the influence of mud splashing from the rear on each device. In addition, since the license plate is attached to the rear surface of the cover of the roll angle detection device, the roll angle detection device can be double protected by the cover and the license plate.

According to the work vehicle described in claim 2 , in addition to the effect of the invention described in claim 1 , wiring connecting the electronically controlled valve (that is, the electronic control valve) and the attitude control device is provided on the center frame. Can be routed down. Thus, the wiring is hidden by the center frame, the appearance is not impaired by the wiring, and the wiring is fixed by the clamp portion, so that the wiring can be easily routed.

According to the working vehicle described in claim 3 , in addition to the effect of the invention described in claim 2 , since the descent speed adjusting device and the valve are on the same side, maintenance of the two devices is facilitated. .

FIG. 1 is a schematic left side view of the work vehicle. FIG. 2 is a schematic plan view of the work vehicle. FIG. 3 is a schematic rear view of the work vehicle. FIG. 4 is an explanatory diagram (part 1) of the manual mode in the posture control of the work implement. FIG. 5 is an explanatory diagram (part 2) of the manual mode in the posture control of the work implement. FIG. 6 is an explanatory diagram of the automatic horizontal mode in the posture control of the work implement. FIG. 7 is an explanatory diagram of the parallel mode in the posture control of the work implement. FIG. 8 is an explanatory diagram of the installation position of the mechanical decelerator. FIG. 9 is an explanatory diagram (part 1) of the configuration of the mechanical decelerator. FIG. 10 is an explanatory diagram (part 2) of the configuration of the mechanical decelerator. FIG. 11 is an explanatory diagram (part 3) of the configuration of the mechanical decelerator. FIG. 12 is an explanatory diagram (part 4) of the configuration of the mechanical decelerator. FIG. 13 is an explanatory view (No. 5) of the configuration of the mechanical decoder. FIG. 14 is an explanatory diagram (part 1) of the installation positions of the roll angle detection device and the attitude control device. FIG. 15 is an explanatory diagram (part 2) of the installation positions of the roll angle detection device and the attitude control device. FIG. 16 is an exploded perspective view of the roll angle detection device. FIG. 17 is an explanatory diagram (part 1) of the inclination angle detection device. FIG. 18 is an explanatory diagram (part 2) of the inclination angle detection device. FIG. 19 is an explanatory diagram of the installation position of the position sensor. FIG. 20 is an explanatory diagram of the installation position of the switch box.

  Hereinafter, an embodiment of a work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited by the embodiments described below.

  FIG. 1 is a schematic left side view of the work vehicle 1. FIG. 2 is a schematic plan view of the work vehicle 1. FIG. 3 is a schematic rear view of the work vehicle 1. In the following, a tractor (agricultural tractor) used when working in a field will be described as an example of the work vehicle 1.

  In the following description, the front-back direction is the traveling direction of the work vehicle, that is, the tractor 1 when traveling straight, and the forward side of the traveling direction is defined as “front” and the rear side is defined as “rear”. Note that the traveling direction of the tractor 1 is a direction from the cockpit 7 to the steering handle 6, which will be described later, when the tractor 1 travels straight (see FIGS. 1 and 2).

  The left-right direction is a direction that is horizontally orthogonal to the front-rear direction. Here, the left and right are defined toward the “front” side. In other words, the left hand side is "left" and the right hand side is "right" in a state where the operator is seated at the cockpit 7 and faces forward (see FIGS. 2 and 3). Further, the up-down direction is a direction orthogonal to the front-rear direction and the left-right direction (see FIGS. 1 and 3). The front-rear direction, the left-right direction, and the up-down direction are orthogonal to each other in three dimensions.

  As shown in FIGS. 1, 2 and 3, the tractor 1 has front wheels 3, 3 and rear wheels 4, 4 at a front portion and a rear portion of a traveling vehicle body 2, respectively, and is mounted on a front portion of the traveling vehicle body 2. The rotational power of the engine E is transmitted to the front wheels 3, 3 and the rear wheels 4, 4 by appropriately decelerating the rotational power of the engine E by a transmission in the transmission case 20 (see FIG. 3).

  A steering handle 6 supported by a handle post 5 is provided at the center of the traveling vehicle body 2, and a cockpit 7 is provided behind the steering handle 6. Although not shown, various operation levers such as a throttle lever for adjusting the number of revolutions of the engine E are provided around the steering handle 6.

  On the step floor 8 at the center of the traveling vehicle body 2, a clutch pedal 9 is provided on the left side with the handle post 5 interposed therebetween, and on the right side, left and right brake pedals 10L, 10R for braking the left and right rear wheels 4, 4 respectively. Is provided.

  As shown in FIG. 2, the traveling vehicle body 2 includes left and right rear fenders 11, 11 that cover the left and right rear wheels 4, 4 from the front and above, on both left and right sides of the cockpit 7. A main shift lever 12 is provided on the upper surface (upper surface) of the left rear fender 11, and a sub-speed selector for selecting any one of low speed, medium speed, high speed and neutral is provided behind the main speed lever 12. A shift lever 13 is provided.

  Further, on the upper surface of the right rear fender 11, for example, the height of the working machine 50 is set by operating the working depth lever 14 for setting the tillage depth of the working machine (for example, a rotary tillage machine) 50 and the lifting arm 101. A position lever 15 is provided.

  Further, left and right rear frames 16, 16 (see FIG. 3) for supporting the left and right rear fenders 11, 11 from below are provided at a rear portion of the traveling vehicle body 2. Further, behind the cockpit 7 in the rear part of the traveling vehicle body 2, an arch-shaped rope frame 17 supported by left and right rear frames 16, 16 is provided.

  The work machine 50 is connected to a rear portion of the traveling vehicle body 2 while being supported by a lift arm 101 (including a rear lift rod) in addition to a hitch (for example, a 2P hitch) attached to the rear frame 16 so as to be liftable. I have. As shown in FIG. 3, the working machine 50 takes out the rotational power transmitted from the engine E from a PTO (Power take-off) shaft 21 provided on the rear surface of the transmission case 20 and rotates, for example, a tilling claw. And tilling work.

  The lifting arm 101 is connected to a lifting link mechanism 120 (see FIG. 12) in a lifting cylinder case 102 (see FIG. 9) provided below the cockpit 7. The elevating cylinder case 102 houses an elevating cylinder 104 (see FIG. 9) for driving the elevating arm 101, in addition to the elevating link mechanism 120.

  Further, for example, by restricting the rotation speed of the lifting link mechanism 120 in conjunction with the rotation of the lifting arm 101 by the damper 121 (see FIG. 12), the lowering speed of the work implement 50 can be reduced. The elevating arm 101, the elevating cylinder case 102, the elevating cylinder 104, the elevating link mechanism 120, and the damper 121 constitute a so-called mechanical decelerator 100 that adjusts the lowering speed of the working machine 50. The details of the mechanical decelerator 100 will be described later with reference to FIGS.

  The work implement 50 is connected to the traveling vehicle body 2 so as to be able to roll around the PTO shaft 21, and is disposed behind the traveling vehicle body 2. Further, the work vehicle (tractor 1) according to the present embodiment has three types of modes for controlling the rolling posture of the work machine 50 with respect to the traveling vehicle body 2 according to the application. Each mode can be switched on and off by a mode switch 61 (see FIG. 2) described later.

  Next, with reference to FIGS. 4 to 7, each mode in the attitude control of the work implement 50 (that is, the rolling attitude) will be described. As described above, in the attitude control of the work implement 50, the mode switch 61 can switch between three types of modes: "manual mode", "automatic horizontal mode", and "parallel mode".

  4 and 5 are explanatory diagrams of the “manual mode” in the posture control of the work implement 50. When the operator presses the mode switch 61 to switch the “manual mode” to “on”, the right-up switch 62 and the right-down switch for adjusting the posture (rolling posture, that is, the posture inclined in the left-right direction) of the work machine 50. The operation by 63 can be performed. 4 and 5 show a case where the traveling vehicle body 2 travels and the work surface Gr such as a field scene where the work is performed by the work machine 50 is horizontal.

  As shown in FIG. 4, in the “manual mode”, one or more pressing operations of the right-up switch 62 (see FIG. 2) cause one of the left and right elevating arms 101 (in the illustrated example, the right arm The rod of the attitude changing cylinder 24 provided on the elevating arm 101) contracts, and pulls up the work implement 50 to the upper right. Accordingly, the work machine 50 rotates in the direction of the arrow R1 via the work machine support member 22, and inclines to the right with respect to the work surface Gr.

  As shown in FIG. 5, in the “manual mode”, the rod of the posture changing cylinder 24 is extended by one or more pressing operations of the lower right switch 63 (see FIG. 2), and the working machine 50 is moved rightward. Push down. Thereby, the work machine 50 rotates in the direction of the arrow R2 via the work machine support member 22, and inclines to the lower right with respect to the work surface Gr.

  The "manual mode" is set to "on" when neither the "automatic horizontal mode" nor the "parallel mode" is selected by the mode switch 61, that is, when neither is set to "on". May be configured.

  FIG. 6 is an explanatory diagram of the “automatic horizontal mode” in the posture control of the work implement 50. When the operator switches the “automatic horizontal mode” to “on” by pressing the mode changeover switch 61, as shown in FIG. 6, even when the work surface Gr is inclined, the work machine 50 Regardless of the rolling of the traveling vehicle body 2 traveling in Gr, automatic control is performed so as to always maintain a horizontal state.

  FIG. 7 is an explanatory diagram of the “parallel mode” in the posture control of the work implement 50. When the operator switches the “parallel mode” to “on” by pressing the mode changeover switch 61, as shown in FIG. 7, for example, when the work surface Gr is inclined, the work machine 50 The vehicle is automatically controlled so as to be inclined in the same manner as the traveling vehicle body 2 rolling along the inclination and always parallel to the work surface Gr.

  The tractor 1 may further include a “tilt mode” in which the work implement 50 is maintained at a preset roll angle regardless of the rolling of the traveling vehicle body 2.

  The tractor 1 detects a reverse operation on the traveling vehicle body 2 and raises the work implement 50 to a non-working position, and sets a predetermined lowering speed when lowering the work implement 50 from the non-working position to the work position. A “deseration (decelaration) mode” may be further provided, in which the shock is reduced from the height to reduce the impact. The “backup mode” or “desera mode” may be switched between on and off by operating an on / off switch.

  In addition, in order to execute the “desera mode”, a mechanical type may be used instead of an electric type in which the on / off switch is used to switch on / off the electric motor. The work vehicle (tractor 1) according to the present embodiment employs a mechanical so-called mechanical decelerator. Here, with reference to FIG. 8 to FIG. 13, the mechanical decelerator 100 will be described.

  FIG. 8 is an explanatory diagram of the installation position of the mechanical decelerator 100. Specifically, FIG. 8 is a schematic right side view showing the rear portion of the traveling vehicle body 2. FIG. 8 is a perspective view of a portion hidden by the rear wheel 4 in a right side view. As shown in FIG. 8, the tractor 1 includes a mechanical decelerator 100 on the right side at the rear of the traveling vehicle body 2 and on the inner side (left side) of the rear wheels 4 in the left-right direction. The mechanical decelerator 100 is a device that adjusts the lowering speed when the work implement 50 is lowered from the non-working position (up position) to the working position (down position) by the operation of the position lever 15 by the operator O.

  9 to 13 are explanatory diagrams of the configuration of the mechanical decelerator 100. FIG. Specifically, FIGS. 9, 10 and 11 are schematic right side views (perspective views) of the elevating cylinder case 102. FIG. 9 shows a basic state of the elevating arm 101, and FIG. FIG. 11 shows a state in which the lifting arm 101 is raised. FIG. 12 is a schematic right side view of the lifting link mechanism 120, and FIG. 13 is a schematic perspective view of a damper (damping member) 121.

  As shown in FIG. 9, in the mechanical decelerator 100, when the valve spool 103 a of the elevating valve 103 is moved in the front-rear direction, the elevating cylinder 104 installed obliquely in the vertical direction inside the elevating cylinder case 102 operates, and the elevating cylinder 104 is operated. The cylinder connecting portion 101b of the lift arm 101 connected to the arm 104a is pushed and pulled. Thus, the lifting arm 101 rotates up and down around the lifting arm rotation shaft 101a.

  In addition, as shown in FIGS. 10 and 11, in the mechanical decelerator 100, when raising and lowering the elevating arm 101 from the lowered position, the operator O moves the position lever 15 (see FIG. 8) backward from the lowered position in which the position lever 15 is tilted forward. , The lower end of the position lever 15 pushes down the lever contact portion 105 a of the first rotating body 105. Thereby, the first rotating body 105 rotates counterclockwise in the drawing. Further, an inner arm 105b is provided inside the first rotating body 105, and when the first rotating body 105 rotates, the inner arm 105b rotates integrally with the first rotating body 105.

  A first internal link 110 is provided inside the internal arm 105b. The first internal link 110 rotates counterclockwise in the figure with the first internal link rotation shaft 110a fixed to the elevating cylinder case 102 as a fulcrum as the internal arm 105b rotates. Further, the first internal link 110 is connected to the internal arm 105b at the upper part, and connected to the internal link pin 110b at the lower part. Therefore, when the first internal link 110 rotates counterclockwise, the second internal link 111 is pulled forward, thereby pushing the valve spool 103a of the elevating valve 103 connected near the lower part of the internal link pin 110b. .

  When the valve spool 103a is pushed by the elevating valve 103, pressure oil is supplied from the oil passage 104b to push out the elevating piston 104c in the elevating cylinder 104, and the elevating arm 101 is raised. At this time, if the elevating arm 101 rises too much with respect to the position of the internal link pin 110b determined by the rotation angle of the first rotating body 105, the connecting portion 111a between the elevating arm 101 and the second internal link 111 becomes an internal link pin. It moves forward than 110b. As a result, the spool connecting portion 111b moves rearward and the supply of the pressure oil to the lifting cylinder 104 stops. As described above, in the mechanical decelerator 100, the position of the position lever 15 and the rotation angles of the lifting arm 101 and the first rotating body 105 are always linked.

  Further, in the mechanical decelerator 100, when the position lever 15 is lowered from the raised position, when the operator O tilts the position lever 15 (see FIG. 8) from the raised position to the rear to the lowered position in the forward direction, the position lever 15 is lowered. Is separated from the lever contact portion 105a of the first rotating body 105, the return spring 105d of the first rotating body 105 (see FIG. 8) rotates the first rotating body 105 clockwise in the figure.

  Since the internal arm 105b rotates clockwise with the rotation of the first rotating body 105, the first internal link 110 rotates clockwise about the first internal link rotation shaft 110a as the fulcrum with the rotation of the internal arm 105b. I do. When the first internal link 110 rotates clockwise, the second internal link 111 is pulled rearward, thereby pulling out the valve spool 103a of the elevating valve 103 connected near below the internal link pin 110b.

  When the valve spool 103a is pulled out by the lift valve 103, the pressure in the lift cylinder 104 decreases, and the lift arm 101 descends while pushing the lift piston 104c into the lift cylinder 104 by its own weight. At this time, if the elevating arm 101 descends too much with respect to the position of the internal link pin 110b determined by the rotation angle of the first rotating body 105, the connecting portion 111a between the elevating arm 101 and the second internal link 111 will be connected to the internal link pin. It moves backward from 110b. As a result, the spool connecting portion 111b moves forward, and pressure oil is supplied to the elevating cylinder 104. As described above, in the mechanical decelerator 100, even when the elevating arm 101 descends, the position of the position lever 15 and the rotation angles of the elevating arm 101 and the first rotating body 105 are always interlocked.

  As shown in FIG. 12, the outer arm 105c of the first rotating body 105 and the lower arm 106a of the second rotating body 106, which rotate in conjunction with the elevating arm 101 (see FIG. 9), are connected to the first link arm 107. When the lifting arm 101 descends, when the first rotating body 105 rotates counterclockwise in the drawing, the second rotating body 106 rotates counterclockwise. Further, the upper arm 106b of the second rotating body 106 is connected by the link connecting arm 108b of the third rotating body 108 and the second link arm 109, and when the second rotating body 106 rotates clockwise, the third arm 106b becomes third. The rotating body 108 rotates clockwise.

  As shown in FIG. 13, the third rotating body 108 has a link connecting arm 108b, a return plate 108d, and a bolt mounting plate 108c welded to a third cylindrical body 108a serving as a rotating shaft, and the respective members are integrated. And rotate. Further, for example, a hole may be provided in the bolt mounting plate 108c, a nut 108e may be welded to the hole, and the bolt 112 may be adjustably inserted into the nut 108e. The return plate 108d is welded to the third cylindrical body 108a so as to face the bolt mounting plate 108c with a space therebetween. In this case, the nut 108e is welded to the bolt mounting plate 108c as an internal thread, but instead of the nut 108e, the bolt 112 may be inserted by tapping the bolt mounting plate 108c.

  As shown in FIGS. 12 and 13, a damper arm 115 is rotatably provided on the outside coaxially with the third rotating body 108. In the damper arm 115, a contact plate 115b and a damper connecting portion 115c are welded to a fourth cylinder 115a serving as a rotation axis, and each member rotates integrally. The contact plate 115b is provided so as to be inserted between the bolt mounting plate 108c of the third rotating body 108 and the return plate 108d. Therefore, when the third rotating body 108 rotates clockwise, the contact plate 115b becomes a predetermined angle or more. When the bolt 112 abuts on the abutment plate 115b at the rotation, the rotation of the third rotating body 108 is transmitted to the damper arm 115.

  Therefore, by adjusting the insertion depth of the bolt 112, the timing at which the damper arm 115 connected to the damper 121 (see FIG. 12) starts rotating (rotating) can be adjusted. Thereby, the position at which the lowering speed of the work machine 50 (see FIG. 1) is reduced can be adjusted. When the third rotating body 108 rotates counterclockwise, the return plate 108d abuts and rotates the damper arm 115 counterclockwise.

  Further, a damper position changing member 116 for adjusting the mounting position of the damper 121 is attached to the damper connecting portion 115c. The damper position changing member 116 is formed in a rectangular shape (U-shape) with an opening at the bottom, is mounted so as to cover the damper connecting portion 115c, and supports the damper mounting rod 116a at the lower portion to support the damper 121. It is attached. The damper mounting rod 116a is inserted into an elongated hole 115d provided below the damper connecting portion 115c, so that the mounting position of the damper 121 can be changed in the radial direction of the rotation of the damper arm 115.

  At the top of the damper position changing member 116, a rectangular hole 116b and a leaf spring 117 for fixing the position of the damper position changing member 116 are provided. The leaf spring 117 is bent downward, once passes through the hole 116b, and is folded downward. The folded portion fits into one of the plurality of grooves formed on the upper surface of the damper connecting portion 115c, thereby fixing the damper position changing member 116.

  Further, by allowing the mounting position of the damper 121 to be changed in the radial direction of rotation, the position between the fourth cylindrical body 115a serving as a rotation fulcrum and the damper mounting rod 116a serving as a point of application of a force for pushing the damper 121 is formed. The distance can be changed. Note that the closer the distance, the stronger the force for pushing the damper 121, and the farther the distance, the weaker the force for pushing the damper 121. The lowering speed of the work machine 50 after the damper 121 starts to work becomes faster as the force for pushing the damper 121 is stronger, and becomes slower as the force for pushing the damper 121 is weaker. Therefore, the distance between the damper 121 and the damper mounting rod 116a is reduced. By changing, the descending speed of the work machine 50 can be adjusted.

  Next, the roll angle detection device 30 and the attitude control device 40 will be described with reference to FIGS. 14 and 15 are explanatory diagrams of the installation positions of the roll angle detection device 30 and the attitude control device 40. 14 and 15 are views (perspective views) of the rear portion of the traveling vehicle body 2 as viewed obliquely from above. Further, in the drawings, the rear wheel 4 and the like are omitted. In FIG. 15, the cockpit 7 is omitted.

  The roll angle detection device 30 is a device that detects a tilt angle in the left-right direction about the roll axis of the traveling vehicle body 2, that is, a roll angle. In the tractor 1 according to the present embodiment, an inclination sensor is employed as the roll angle detection device 30. Hereinafter, the roll angle detection device 30 is referred to as an “inclination sensor”.

  Heretofore, the roll angle detection device 30 and the attitude control device 40 have conventionally been located at separate positions. For this reason, wiring such as a wire harness connecting both devices has become long, wiring has become complicated, and assembly has been difficult. In the work vehicle (tractor 1) according to the present embodiment, the roll angle detection device 30 and the attitude control device 40 are provided close to each other.

  As shown in FIGS. 14 and 15, the inclination sensor 30 is provided at a rear portion of the traveling vehicle body 2. More specifically, the inclination sensor 30 is provided immediately above a center frame 23 provided behind the cockpit 7 at the rear of the traveling vehicle body 2. The center frame 23 is a member that is provided above the left and right rear frames 16 and 16 and that extends between the left and right rear frames 16 and 16 in the left and right direction.

  The rear surface (rear surface) of the inclination sensor 30 is covered with a cover (hereinafter, referred to as “inclination sensor cover”) 35. In this way, by covering the rear surface of the inclination sensor 30 with the inclination sensor cover 35, it is possible to prevent the inclination sensor 30 from being affected by mud splashing from the rear. The tilt sensor cover 35 may cover all of the four sides of the tilt sensor 30 or at least a part of the four sides including the rear surface.

  Further, the tilt sensor cover 35 further has a license plate attaching portion 36 to which a license plate P (see FIG. 14) of the vehicle is attached on a rear surface (rear surface). The details of the tilt sensor 30 will be described later with reference to FIG.

  The attitude control device 40 is a device that controls the rolling attitude of the work implement 50 (see FIG. 1) with respect to the traveling vehicle body 2. The posture control device 40 controls the expansion and contraction of the rod of the posture changing cylinder 24 based on the detection value of the inclination sensor 30 to control the rolling posture of the work implement 50. As shown in FIGS. 14 and 15, the attitude control device 40 is provided at the rear of the traveling vehicle body 2. More specifically, the attitude control device 40 is provided via a bracket directly below the center frame 23 at the rear of the traveling vehicle body 2 and is provided below the tilt sensor 30 and close to the tilt sensor 30. Have been.

  Further, the rear surface (rear surface) of the attitude control device 40 is covered with a cover (hereinafter, referred to as “control device cover”) 45. In this way, by covering the rear surface of the attitude control device 40 with the control device cover 45, it is possible to prevent the attitude control device 40 from being affected by mud splashing from the rear. The control device cover 45 may cover all of the four sides of the attitude control device 40 or at least a part of the four sides including the rear surface.

  As described above, according to the tractor 1 according to the present embodiment, the inclination sensor 30 and the attitude control device 40 are concentrated on the rear portion of the traveling vehicle body 2, so that wiring such as a wire harness can be easily arranged. Thereby, the ease of assembly can be improved. Further, the inclination sensor 30 and the attitude control device 40 can be connected with a short wiring, and the cost of parts can be reduced. Further, the manufacturing cost can be reduced by improving the ease of assembly and reducing the cost of parts.

  Further, since the inclination sensor 30 is immediately behind (directly behind) the cockpit 7, the operator can adjust the roll angle of the work machine 50 (see FIG. 3) while sitting on the cockpit 7. Thereby, fine adjustment of the working machine 50 by the inclination sensor 30 becomes easy. In addition, the inclination sensor 30 can be easily installed.

  Further, since the license plate mounting portion 36 is provided on the rear surface of the tilt sensor cover 35, the license plate P mounted on the license plate mounting portion 36 is positioned at the height of the center frame 23. Therefore, the visibility of the license plate P from the outside is improved.

  As shown in FIGS. 14 and 15, below the attitude control device 40, an attitude (rolling attitude) of the work machine 50, that is, an inclination angle detection for detecting an inclination angle (roll angle) in the left-right direction with respect to the traveling vehicle body 2. A device 70 is provided near the attitude control device 40. In the tractor 1 according to the present embodiment, a stroke sensor is used as the inclination angle detection device 70. Hereinafter, the inclination angle detection device 70 is referred to as a “stroke sensor”. The details of the stroke sensor 70 will be described later with reference to FIG.

  The back surface (rear surface) of the stroke sensor 70 is covered with a cover (hereinafter, referred to as “stroke sensor cover”) 75. In this way, by covering the rear surface of the stroke sensor 70 with the stroke sensor cover 75, it is possible to prevent the stroke sensor 70 from being affected by mud splashing from the rear. The stroke sensor cover 75 may cover all of the four sides of the stroke sensor 70 or at least a part of the four sides including the rear surface.

  As described above, according to the tractor 1 according to the present embodiment, the inclination sensor 30, the attitude control device 40, and the stroke sensor 70 are concentrated near the center frame 23 at the rear of the traveling vehicle body 2, and the respective rear surfaces are covered. By being covered by the (inclination sensor cover 35, the control device cover 45, and the stroke sensor cover 75), it is possible to prevent the influence of each device (equipment) due to splashing of mud from the rear. In addition, since the license plate P is attached to the rear surface of the tilt sensor cover 35, the tilt sensor 30 can be double protected by the tilt sensor cover 35 and the license plate P.

  Further, since the stroke sensor 70 and the posture control device 40 are close to each other, the stroke sensor 70 and the posture control device 40 can be connected with a short wiring, so that the wiring can be easily arranged and the component cost can be reduced. Can be reduced. Thereby, the manufacturing cost can be further reduced.

  As shown in FIGS. 14 and 15, at the rear of the traveling vehicle body 2, a work machine support member 22 that supports the work machine 50 and that is inclined (rotated) in the left-right direction together with the rolling of the work machine 50 is provided. I have. That is, the working machine support member 22 is inclined in the same manner as the roll angle of the working machine 50 according to the rolling posture of the working machine 50. Therefore, if the stroke sensor 70 detects the inclination angle of the work implement support member 22 in the left-right direction, the rolling posture of the work implement 50 can be detected.

  As described above, according to the tractor 1 according to the present embodiment, the inclination of the work implement support member 22 can be detected to detect the rolling posture (with respect to the traveling vehicle body) of the work implement 50, so that the configuration is simplified. . Thereby, the manufacturing cost can be further reduced.

  The tilt sensor 30, the attitude control device 40, and the stroke sensor 70 are arranged at the center in the left-right direction of the center frame 23, and are arranged so as to be aligned on the same line in the up-down direction. Thus, the three devices can be arranged at the shortest distance, and the inclination sensor 30 and the stroke sensor 70 can accurately detect the roll angle of the traveling vehicle body 2 and the attitude of the work implement 50, respectively.

  Here, the details of the roll angle detection device (tilt sensor) 30 will be described with reference to FIG. FIG. 16 is an exploded perspective view of the roll angle detection device (tilt sensor) 30. Conventionally, for example, a reference value used as a reference when processing the detection value of the inclination sensor 30 is changed by pressing a switch to tilt the posture of the work machine, but every time the switch is pressed once, The amount of change may vary depending on the model or the like, and the adjustment of the posture of the work machine 50 may be complicated. For this reason, in the tractor 1 according to the present embodiment, the inclination sensor 30 is rotated around the roll axis L of the traveling vehicle body 2.

  As shown in FIG. 16, an inclination sensor 30 serving as a roll angle detection device is provided on a surface (upper surface) 23 a above the center frame 23. The center frame 23 has the above-described upper surface 23a and a front surface (front surface) 23b bent at a right angle from the upper surface, and is formed in a hook shape when viewed from the left and right side surfaces.

  On the front surface 23b of the center frame 23, a mounting plate 25 is provided so as to protrude upward from the center frame 23, facing the front surface 23b. A support bracket 32 that supports the sensor main body 31 of the tilt sensor 30 is mounted on the mounting plate 25. Thus, the tilt sensor 30 is assembled. The mounting plate 25 has a circular first hole 25a, and the support bracket 32 has a first shaft portion 32a that protrudes forward and can be inserted into the first hole 25a. When the mounting plate 25 is mounted on the center frame 23, the center of the first hole 25 a is located on the roll axis L of the traveling vehicle body 2.

  Further, by inserting the first shaft portion 32a of the support bracket 32 into the first hole portion 25a of the mounting plate 25, the support bracket 32 can be moved in the left-right direction about the roll axis L of the traveling vehicle body 2 with respect to the mounting plate 25. (Rotation). Therefore, the sensor main body 31 fixed to the support bracket 32 can rotate around the roll axis L of the traveling vehicle body 2 in a state where the sensor main body 31 is attached to the center frame 23.

  As described above, according to the tractor 1 according to the present embodiment, the inclination sensor 30 is rotated around the roll axis L of the traveling vehicle body 2, so that the rolling posture of the work machine 50 regardless of the roll angle of the traveling vehicle body 2. Adjustment is possible. Thereby, the posture of the work machine 50 can be easily adjusted.

  The mounting plate 25 has a second hole 25b which is a vertically long hole, and the support bracket 32 has a second shaft portion 32b which protrudes forward and can be inserted into the second hole 25b. I have. By allowing the second shaft portion 32b of the support bracket 32 to pass through the second hole portion 25b of the mounting plate 25, the rotation of the support bracket 32 in the left-right direction can be restricted to a predetermined range and excessive rotation can be suppressed. .

  The support bracket 32 is attached to the upper surface 25a of the attachment plate 25 with a gap. By passing the wiring connecting the inclination sensor 30 and the attitude control device 40 through such a gap, the wiring is not exposed to the outside, and the appearance can be improved.

  In a state where the sensor main body 31 is mounted on the center frame 23 via the support bracket 32, the inclination sensor cover 35 is mounted from above so as to cover the sensor main body 31. A rotation operation lever 33 is detachably attached to the tilt sensor 30 on a sensor main body 31, more precisely, on a support bracket 32. The rotation operation lever 33 is for manually rotating the inclination sensor 30 around the roll axis L. In use, the rotation operation lever 33 is provided through an elongated hole 35 a provided on the upper surface of the inclination sensor cover 35 and extending in the left-right direction. As shown by a two-dot broken line in the middle, it is inserted into the mounting tube 32c of the support bracket 32. When not in use, the rotation operation lever 33 is inserted into a hole 35b provided near any one of the four corners on the upper surface of the inclination sensor cover 35. Thus, the rotation operation lever 33 is held by the tilt sensor cover 35.

  According to the tractor 1 according to the present embodiment, when the operator does not turn the tilt sensor 30, the turning operation lever 33 is detached from the sensor main body 31 so that the operator contacts the turning operation lever 33. Thus, it is possible to prevent a change that the operator does not intend, that is, an erroneous operation, such as a change in the rolling posture of the work implement 50. In addition, erroneous operation is prevented by covering the inclination sensor 30 with the inclination sensor cover 35.

  Further, as described above, since the inclination sensor 30 is located behind the cockpit 7 (see FIG. 14), when the operator rotates the inclination sensor 30 from the cockpit 7, the operator moves from the cockpit 7. Can be operated facing backwards. Thus, the operator can turn the tilt sensor 30 while visually confirming the movement of the work implement 50.

  As shown in FIG. 16, the center frame 23 is provided with a clamp 26 on at least one of the left and right sides (in the illustrated example, on the left side) with the tilt sensor 30 interposed therebetween. The clamp portion 26 is provided on a lower surface of the center frame 23 (a back surface of the upper surface 23a), and has a clamp member 26 which is a plastic member extending rearward from the center frame 23. By folding the clamp member 26 downward, wiring connecting a valve 27 (described later) for adjusting the pressure oil supplied to the attitude changing cylinder 24 and the attitude control device 40 can be collectively fixed. it can.

  As shown in FIG. 15, a valve 27 for adjusting the pressure oil to be supplied to the attitude changing cylinder 24 under electronic control is provided immediately below the cockpit 7. The valve 27 is provided on one of the left and right sides of the lifting / lowering cylinder case 102 (in the illustrated example, on the right side of the lifting / lowering cylinder case 102). As described above, since the valve 27 is on the same side (right side) in the left-right direction as the posture changing cylinder 24, the length for taking out the hydraulic pressure can be minimized, and the position is hard to be seen by the operator. In maintenance, it is a position where the operator can easily work. Further, since the valve 27 is located at a position not visible from the outside, the appearance can be improved. A detachable mudguard cover 28 is provided on the outside (right side) of the valve 27. Further, the mudguard cover 28 may be made of rubber so as to be easily attached and detached.

  As described above, according to the tractor 1 according to the present embodiment, the wiring connecting the valve 27 to be electronically controlled and the attitude control device 40 can be routed below the center frame 23. As a result, the wiring is hidden by the center frame 23, and the appearance is not impaired by the wiring. Further, since the wiring is fixed by the clamp portion 26 as described above, the wiring can be easily routed. .

  The details of the inclination angle detection device (stroke sensor) 70 will be described with reference to FIGS. 17 and 18. 17 and 18 are explanatory diagrams of the inclination angle detection device (stroke sensor) 70. FIG. 17 is a diagram (perspective view) of the rear portion of the traveling vehicle body 2 as viewed obliquely from above. In the figure, the stroke sensor cover 75 (see FIG. 14) is omitted. Also, the rear wheel 4 and the like are omitted in the figure.

  As shown in FIG. 17, the stroke sensor 70 includes a turning arm 71 that turns left and right around a turning shaft 71a in the front-rear direction. The stroke sensor 70 is fixed to the rear surface of the seat bracket 19 (see FIG. 15) that supports the cockpit 7. The work implement support member 22 described above is provided below the stroke sensor 70 on the rear surface of the transmission case 20 (see FIG. 3). The work implement support member 22 is provided rotatably around the PTO shaft 21. Further, a PTO shaft cover 76 is fixed on the upper part of the work implement support member 22. The PTO shaft cover 76 is fixed so that the center of the front edge is pressed down from above by a cover fixing plate 77. The cover fixing plate 77 is provided with a connecting rod 77a projecting upward. The connection rod 77a is connected to the rotation arm 71 of the stroke sensor 70.

  As shown in FIG. 18, when the working machine support member 22 to which the working machine 50 (see FIG. 3) is connected via the left and right connecting portions 22a and 22b rotates in the left and right direction with the rolling of the working machine 50, the work is performed. The machine support member 22 rotates similarly. When the work machine support member 22 rotates, the rotation arm 71 connected to the connecting rod 77a rotates about the rotation shaft 71a. Then, the stroke sensor 70 detects the rolling amount of the working machine 50 by detecting the amount of change (the amount of rotation) of the rotating arm 71.

  Further, since the stroke sensor 70 is provided at the rear portion of the traveling vehicle body 2, the distance between the stroke sensor 70 and the work machine 50, which is the object to be detected, is the shortest, and the rolling posture of the work machine 50 can be detected with high sensitivity.

  Next, with reference to FIG. 19, a description will be given of horizontal control regulation of the working machine 50 (see FIG. 3) using the position sensor 80. FIG. 19 is an explanatory diagram of the installation position of the position sensor 80. FIG. 19 is a diagram (perspective view) of the rear portion of the traveling vehicle body 2 as viewed obliquely from the front. As shown in FIG. 19, a position sensor 80 is provided near one of the left and right elevating arms 101 (left side in the illustrated example) extending from the rear part of the traveling vehicle body 2 to the elevating arm rotating shaft 101a. Have been. The position sensor 80 detects the height of the lifting arm 101.

  Then, when the position sensor 80 detects the elevation of the elevating arm 101 by a predetermined height or more, the posture control device 40 regulates the horizontal control of the work implement 50. In this way, by restricting the horizontal control of the work implement 50, it is possible to prevent the work implement 50 from tilting (turning) in the left-right direction at a high position, and the work implement 50 is turned by an erroneous operation. Therefore, it is possible to eliminate the danger of being caught by the rotating work machine 50. Further, it is possible to prevent the traveling vehicle body 2 from being damaged due to the rotation of the work implement 50 at a high position.

  The position sensor 80 is supported by a sensor bracket 81, and the sensor bracket 81 is fastened together with the mounting bolt 29a of the rear axle case 29.

  Next, with reference to FIG. 20, the arrangement of the switch box 60 including the switches related to the posture of the work implement 50 (see FIG. 3) including the mode changeover switch 61 will be described. FIG. 20 is an explanatory diagram of the installation position of the switch box 60. FIG. 20 is a view (perspective view) of the right side of the traveling vehicle body 2 as viewed from obliquely above. Further, in the drawings, the rear wheel 4 and the like are omitted.

  As shown in FIG. 20, the switch box 60 includes a mode changeover switch 61, a right-up switch 62, and a right-down switch 63. As described above, the mode changeover switch 61 is a switch that switches between modes (“manual mode”, “automatic horizontal mode”, and “parallel mode”) for controlling the rolling posture of the work implement 50 based on the detection value of the inclination sensor 30. It is. The right-up switch 62 and the right-down switch 63 are switches for adjusting the posture (inclination in the left-right direction) of the work machine 50 in the “manual mode”. The mode changeover switch 61, the right-up switch 62, and the right-down switch 63 are assembled by a switch box 60. For this reason, the mounting workability is improved.

  The switch box 60 is provided on a surface (upper surface) above one of the left and right rear fenders 11 (the right rear fender 11 in the illustrated example). Therefore, the mode switch 61 is provided on the upper surface of the right rear fender 11. In addition, the switch box 60 is provided on one of the left and right sides (outside on the right side) of the tilt sensor 30 and in front of the tilt sensor 30. Therefore, the mode changeover switch 61 is provided on the outer side on the right side of the inclination sensor 30 and forward of the inclination sensor 30.

  As described above, according to the tractor 1 according to the present embodiment, the operator can easily operate both the tilt sensor 30 and the mode changeover switch 61 in a posture in which the operator looks back from the cockpit 7 (see FIG. 2). it can. Further, the operation of both the tilt sensor 30, the right-up switch 62, and the right-down switch 63 can be easily performed.

  As for the positional relationship of the switches in the switch box 60, the mode changeover switch 61 is disposed at the rear, and the right-up switch 62 and the right-down switch 63 are disposed at the front. Further, a right-up switch 62 is arranged inside the traveling vehicle body 2 (left side), and a right-down switch 63 is arranged outside the traveling vehicle body 2 (right side). Thereby, the posture of the working machine 50 can be adjusted to the sitting posture and sense of the operator, and the operability can be improved. Further, the mode switch 61, the right-up switch 62, and the right-down switch 63 are arranged behind the hand catcher 18 of the traveling vehicle body 2. This also makes it possible to adjust the posture of the work machine 50 to the sitting posture and feeling of the operator, thereby improving operability.

  The switch box 60 is fixed to the upper surface of the rear fender 11 at two points, front and rear. The switch box 60 is fixed to the rear fender 11 with bolts and nuts, and is fastened to the right rear frame 16 together.

  A trim 64 made of resin or the like is mounted on an outer peripheral portion of a surface (bottom surface) of the switch box 60 facing the upper surface of the rear fender 11 to conform to the upper surface shape of the rear fender 11. Thereby, the gap between the bottom surface of the switch box 60 and the upper surface of the rear fender 11 can be filled, and the waterproofness and dustproofness can be improved. The trim 64 may be attached to the inner peripheral edge of the switch box 60 so that the wiring housed inside the switch box 60 is not damaged on the inner peripheral surface of the bottom surface of the switch box 60, that is, in order to protect the wiring. .

  The switch box 60 has a predetermined height (thickness). Thus, wiring such as a wire harness can be stored inside the switch box 60, and only the trunk line is exposed to the outside, so that the appearance can be improved.

  Although not shown, the trunk of the wiring such as a wire harness is routed along the rear fender 11, and is fixed together by a clamp provided on the rear fender 11, for example, on the lower surface of the rear fender 11. As a result, only the trunk line of the wiring can be seen from the outside, and the trunk line is also along the traveling vehicle body 2, so that the appearance can be improved.

  Further, as described above, the descent speed adjusting device (mechanical deceleration) 100 that adjusts the descent speed of the work implement 50 is provided on the right side of the rear portion of the traveling vehicle body 2 in the left-right direction. In addition, the mechanical deserella 100 is provided on one of the left and right sides (right side) of the elevating cylinder case 102 (see FIG. 15). Further, the above-described valve 27 (see FIG. 15) is provided on the same side as the side on which the mechanical decelerator 100 is provided.

  As described above, according to the tractor 1 according to the present embodiment, the maintenance and the like of the two devices are facilitated because the mechanical decelerator 100 and the valve 27 are on the same side.

  Further, since the mechanical decelerator 100, the valve 27, and the like are disposed on the right side of the traveling vehicle body 2, other sensors such as a position sensor 80 (see FIG. 19) are provided on the left side of the rear portion of the traveling vehicle body 2 in the left-right direction. Have been. Thus, maintenance of the sensors can be performed by removing the rear wheel 4 and the mudguard cover 28 (see FIG. 15) on the left side of the traveling vehicle body 2. That is, maintenance work becomes easy.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

1 work vehicle (tractor)
DESCRIPTION OF SYMBOLS 2 Running body 3 Front wheel 4 Rear wheel 7 Pilot 11 Rear fender 15 Position lever 16 Rear frame 17 Loop frame 18 Hand catcher 19 Seat bracket 20 Transmission case 21 PTO shaft 22 Work implement support member 23 Center frame 23a Upper surface 23b Front surface 24 Position change cylinder Reference Signs List 25 mounting plate 26 clamp member 27 valve 28 mudguard cover 29 rear axle case 29a mounting bolt 30 roll angle detector (tilt sensor)
33 rotation operation lever 35 cover (tilt sensor cover)
36 License plate mounting part 40 Attitude control device 45 Cover (Control device cover)
Reference Signs List 50 working machine 60 switch box 61 mode changeover switch 62 right-up switch 63 right-down switch 70 tilt angle detection device (stroke sensor)
75 cover (stroke sensor cover)
76 PTO shaft cover 80 Position sensor 81 Sensor bracket 100 Lowering speed adjustment device (Mecha Desera)
Reference Signs List 101 Lifting arm 102 Lifting cylinder case 103 Lifting valve 104 Lifting cylinder 105 First rotating body 106 Second rotating body 107 First link arm 108 Second rotating body 109 Second link arm 110 First internal link 111 Second internal link 112 Bolt 113 Bolt 115 Damper arm 116 Damper position changing member 117 Leaf spring 120 Lifting link mechanism 121 Damper E Engine Gr Work surface L Roll shaft O Operator P Number plate

Claims (3)

A traveling body in which the working machine is connected to the rear part so as to be able to roll,
A roll angle detection device provided at a rear portion of the traveling vehicle body and detecting a roll angle of the traveling vehicle body,
An attitude control device that is provided at a rear portion of the traveling vehicle body in proximity to the roll angle detection device and controls a rolling attitude of the working machine with respect to the traveling vehicle body based on a detection value of the roll angle detection device ,
A work implement support member that is provided at a rear portion of the traveling vehicle body and that inclines with rolling of the work implement while supporting the work implement;
An inclination angle detection device that is provided close to the attitude control device and detects an inclination angle of the work implement support member.
A center frame that is provided above the left and right rear frames that respectively support the left and right rear fenders from below, and that is bridged between the left and right rear frames;
With
The roll angle detection device,
A cover is provided immediately above the center frame and covers a rear surface,
The attitude control device,
A cover is provided immediately below the center frame and covers a rear surface,
The inclination angle detection device,
A cover is provided immediately below the attitude control device and covers a rear surface,
The cover of the roll angle detection device,
A work vehicle further comprising a license plate attaching portion on a rear surface . A posture changing cylinder provided on one of the left and right elevating arms for elevating and lowering the work machine, and changing the rolling posture of the work machine,
An elevating cylinder case that is provided below a cockpit arranged between the left and right rear fenders and houses an elevating cylinder that drives the elevating arm;
A valve that is provided on one of the left and right sides of the elevating cylinder case and is electronically controlled to adjust pressure oil to be supplied to the posture changing cylinder,
2. The work vehicle according to claim 1 , further comprising: a clamp unit provided on the center frame, the clamp unit fixing a wiring connecting the valve and the attitude control device. 3. Further provided is a descent speed adjusting device that is provided on one of the left and right sides of the elevating cylinder case, and adjusts a descent speed of the working machine,
The valve is
The work vehicle according to claim 2 , wherein the work vehicle is provided on the same side of the lifting cylinder case as the side on which the descent speed adjusting device is provided.

Images