Work vehicle

Abstract

To provide a working vehicle capable of reducing fatigue of a lower body of a worker by suppressing vibration propagated to a pedal of an accelerator pedal.SOLUTION: An accelerator pedal (19) for operating a transmission case (25) for increasing and decreasing output rotation of an engine is provided on a floor (18) of a steering unit (6), the accelerator pedal (19) is formed of an arm (30,50,60) extending in a vertical direction and a pedal (34,54,64) to be stepped on by a worker, a lower portion of the arm (30,50,60) is connected to a rotation shaft (26) of the transmission case (25), and an upper portion of the arm (30,50,60) and a lower portion of the pedal (34,54,64) are connected via a damper (32,52,62).SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a work vehicle having an accelerator pedal for increasing or decreasing the traveling speed provided on the floor of the control panel. [Background technology]

[0002] A known technology is to provide an accelerator pedal on the right side of the steering column of the control section, which is operated by an operator sitting on the control section to increase or decrease the vehicle's traveling speed (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-100912 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the method described in Patent Document 1, engine vibrations are transmitted to the accelerator pedal that the worker presses via the transmission case, which creates the problem that if the worker operates the accelerator pedal for a long period of time, the worker's lower body, particularly the right leg, becomes fatigued.

[0005] SUMMARY OF THE INVENTION It is therefore a primary object of the present invention to provide a work vehicle that can reduce fatigue in the lower body of a worker by suppressing vibrations transmitted to the accelerator pedal. [Means for solving the problem]

[0006] The present invention, which has solved the above problems, is as follows. That is, the invention described in claim 1 is a work vehicle in which a pair of left and right front wheels (2) and rear wheels (3) are provided below a body frame (1) on which an engine is mounted, and a control section (6) on which a worker rides is provided above the body frame (1), An accelerator pedal (19) for operating a transmission case (25) that increases or decreases the output rotation of the engine is provided on the floor (18) of the operating section (6), and the accelerator pedal (19) is formed by an arm (30, 50, 60) extending in the vertical direction and a pedal (34, 54, 64) that the worker steps on, the lower part of the arm (30, 50, 60) is connected to the rotation shaft (26) of the transmission case (25), and the upper part of the arm (30, 50, 60) is connected to the lower part of the pedal (34, 54, 64) via a damper (32, 52, 62).

[0007] The invention described in claim 2 is the work vehicle described in claim 1, in which a first connecting plate (31) having a predetermined length in the up-down direction and the front-rear direction is provided on the upper part of the arm (30), a second connecting plate (33) having a predetermined length in the up-down direction and the front-rear direction is provided below the pedal (34), the damper (32) is formed of a damper main body (40) having a longitudinal direction in the left-right direction, flanges (41) on both sides of the damper main body (40), and a left connecting member (42L) and a right connecting member (42R) extending in the left-right direction from the flanges (41), and the right connecting member (42R) is connected to the first connecting plate (31), and the left connecting member (42L) is connected to the second connecting plate (33).

[0008] A third aspect of the present invention is the work vehicle according to the second aspect, wherein the damper body (40) is disposed within the outer periphery of the pedal (34) in plan view.

[0009] The invention described in claim 4 is the work vehicle described in claim 3, in which a first plate (37) extending toward the left side below the pedal (34) is provided on the upper part of the first connecting plate (31), and an elastic member (38) extending in the vertical direction is provided on the first plate (37).

[0010] The invention described in claim 5 is the work vehicle described in claim 3 or 4, in which a stopper pin (36) is provided on the upper surface of the floor (18), and a second plate (35) extending toward the left is provided below the first connecting plate (31), and when the pedal (34) is depressed more than a predetermined amount, the second plate (35) abuts against the stopper pin (36).

[0011] The invention described in claim 6 is the work vehicle described in claim 5, wherein a circumferential elongated hole (31A) is opened in the first connecting plate (31) at a position radially away from the right connecting member (42R) by a predetermined distance when viewed from the axis of the right connecting member (42R), and a connecting member (44) connecting the arm (30) and the first connecting plate (31) is inserted into the elongated hole (31A). [Effects of the Invention]

[0012] According to the invention of claim 1, an accelerator pedal (19) for operating a transmission case (25) that increases or decreases the output rotation of the engine is provided on the floor (18) of the operating section (6), and the accelerator pedal (19) is formed by an arm (30, 50, 60) extending in the vertical direction and a pedal (34, 54, 64) that the operator presses down. The lower part of the arm (30, 50, 60) is connected to the rotation shaft (26) of the transmission case (25), and the upper part of the arm (30, 50, 60) is connected to the lower part of the pedal (34, 54, 64) via a damper (32, 52, 62). This makes it possible to reduce engine vibrations that are transmitted to the pedal (34, 54, 64) via the transmission case (25) etc.

[0013] According to the invention of claim 2, in addition to the effects of the invention of claim 1, a first connecting plate (31) having a predetermined length in the up-down direction and the front-rear direction is provided on the upper part of the arm (30), a second connecting plate (33) having a predetermined length in the up-down direction and the front-rear direction is provided below the pedal (34), the damper (32) is formed of a damper main body (40) having a longitudinal direction in the left-right direction, flanges (41) on both sides of the damper main body (40), and a left connecting member (42L) and a right connecting member (42R) extending in the left-right direction from the flanges (41), and the right connecting member (42R) is connected to the first connecting plate (31), and the left connecting member (42L) is connected to the second connecting plate (33). This makes it possible to further reduce engine vibrations transmitted to the pedal (34) via the transmission case (25) etc.

[0014] According to the invention of claim 3, in addition to the effect of the invention of claim 2, the damper body (40) is arranged within the outer periphery of the pedal (34) in plan view. This makes it possible to suppress large deflections and twists in the damper body (40) when the worker presses the pedal (34), thereby preventing early deterioration in performance of the damper body (40).

[0015] According to the invention of claim 4, in addition to the effect of the invention of claim 3, a first plate (37) extending to the left below the pedal (34) is provided on the upper part of the first connecting plate (31), and an elastic member (38) extending in the vertical direction is provided on the first plate (37). Therefore, even when the operator presses the pedal (34) hard, the lower part of the pedal (34) is prevented from abutting against the flange (41) of the damper (32), and vibrations of the engine, etc., transmitted to the pedal (34) can be reliably reduced.

[0016] According to the invention of claim 5, in addition to the effects of the invention of claim 3 or 4, a stopper pin (36) is provided on the upper surface of the floor (18), and a second plate (35) extending toward the left is provided below the first connecting plate (31), so that when the pedal (34) is depressed more than a predetermined amount, the second plate (35) abuts against the stopper pin (36), thereby preventing the pedal (34) from being depressed excessively and preventing the working vehicle from suddenly accelerating its traveling speed.

[0017] According to the invention of claim 6, in addition to the effect of the invention of claim 5, when viewed from the axis of the right connecting member (42R), a circumferential elongated hole (31A) is opened in the first connecting plate (31) at a position a predetermined distance radially from the right connecting member (42), and the connecting member (44) that connects the arm (30) and the first connecting plate (31) is inserted into the elongated hole (31A). Therefore, the operator can loosen the connecting member (44) and swing the first connecting plate (31) to easily change the tilt angle of the pedal (34) to an angle that suits his or her body shape. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is an explanatory diagram of an accelerator pedal and a transmission case. [Figure 5] 1 is a perspective view of a forward accelerator pedal according to a first embodiment, as viewed from above and in front thereof. [Figure 6] FIG. 2 is a front view of the forward accelerator pedal of the embodiment. [Figure 7] FIG. 2 is a right side view of the forward accelerator pedal of the embodiment. [Figure 8] FIG. 2 is a perspective view of the damper of the embodiment as viewed from the front right side. [Figure 9] FIG. 2 is a perspective view of the forward accelerator pedal of the embodiment as viewed from the front lower side. [Figure 10]FIG. 2 is a bottom view of the forward accelerator pedal of the embodiment. [Figure 11] FIG. 10 is a front view of a forward accelerator pedal according to a second embodiment. [Figure 12] FIG. 10 is a front view of a forward accelerator pedal according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] As shown in Figures 1 to 3, a work vehicle such as a tractor has a pair of left and right front wheels 2 at the front underside of a body frame 1, a pair of left and right rear wheels 3 at the rear underside of the body frame 1, and a work implement 4 for cutting grass or the like is provided between the front wheels 2 and rear wheels 3 at the underside of the body frame 1.

[0020] A bonnet 5 for storing the engine is provided at the front upper part of the machine frame 1, a control section 6 on which the operator sits is provided at the rear of the bonnet 5, a safety frame 7 for protecting the operator is provided behind the control section 6, and a grass collection container 8 for storing grass and the like cut by the work implement 4 is provided below and behind the safety frame 7. The rear of the work implement 4 and the front of the grass collection container 8 are connected by a chute 9.

[0021] A steering wheel 11 is provided in front of a driver's seat 10 in the control section 6, and the steering wheel 11 is supported by a steering column 12 via a steering shaft (not shown). A panel dash 13 is formed on the top of the steering column 12.

[0022] A fender 15 located on the left side of the operator's seat 10 is provided with a cleaner lever 16 that drives a cleaner (not shown) that forcibly transports grass clippings cut by the work implement 4 to a grass collection container 8, and a fender 15 located on the right side is provided with a lifting lever 17 that raises and lowers the work implement 4.

[0023] An accelerator pedal 19 for moving the work vehicle forward and backward is provided on a floor 18 located to the right of the steering column 12.

[0024] As shown in FIG. 4, the accelerator pedal 19 is made up of a forward accelerator pedal 21 that moves the work vehicle forward and a reverse accelerator pedal 22 that moves the work vehicle backward and is supported on a support shaft 20 that extends in the left-right direction.

[0025] When the worker depresses the forward accelerator pedal 21, a trunnion shaft (referred to as a "rotating shaft" in the claims) 26 that operates a pump in a continuously variable transmission 25A located at the front of the transmission case rotates clockwise via an arm 24 connected to the support shaft 20, thereby increasing the forward speed of the work vehicle. When the worker depresses the reverse accelerator pedal 22, the trunnion shaft 26 rotates counterclockwise via the arm 24, thereby increasing the reverse speed of the work vehicle. When the worker is not depressing either the forward accelerator pedal 21 or the reverse accelerator pedal 22, the vehicle is in neutral and does not move forward or backward.

[0026] <Forward accelerator pedal of the first embodiment> 5 to 7, the forward accelerator pedal 21 is formed of an arm 30 whose lower part is fixed to the support shaft 20 and extends forward and upward, a damper plate (referred to as a "first connecting plate" in the claims) 31 on which a damper such as a vibration-isolating rubber is mounted and which is swingably fixed to the right surface of the upper part of the arm 30, a damper 32 which is fixed to the left surface of the damper plate 31 and extends in the left-right direction, a pedal arm (referred to as a "second connecting plate" in the claims) 33 whose lower part is fixed to the left surface of the damper 32 and extends backward and upward, and a pedal 34 which is fixed to the upper part of the pedal arm 33 and which is operated by the operator by stepping on it. This reduces vibrations from the engine and the like which are transmitted to the pedal 34 via the continuously variable transmission 25A and the like.

[0027] A stopper plate (referred to as a "second plate" in the claims) 35 is provided below the damper plate 31 and extends leftward from the lower side of the damper 32, and a stopper pin 36 that comes into contact with the lower surface of the stopper plate 35 is provided in the floor 18. This prevents the pedal 34 from being pressed down too hard and causing a sudden acceleration of the forward speed.

[0028] 8, the damper 32 is formed by a cylindrical damper body 40 and circular metallic flanges 41 on both sides of the damper body 40. A stud bolt (referred to as a "left connecting member" in the claims) 42L extending leftward is provided at the center of the left flange 41, and a stud bolt (referred to as a "right connecting member" in the claims) 42R extending rightward is provided at the center of the right flange 41.

[0029] 6, the lower portion of the pedal arm 33 is fixed to a stud bolt 42L. A predetermined gap is provided between the lower surface of the pedal 34 and the flange 41.

[0030] 7, stud 42R is fixed to the upper front portion of damper plate 31. When viewed from the axis of stud 42R, a circumferentially extending elongated hole 31A is opened at the rear of damper plate 31 at a position spaced a predetermined distance radially from stud 42R.

[0031] The rear part of the damper plate 31 is pivotally fixed to the upper part of the arm 30 by a connecting member 44 such as a bolt inserted into the elongated hole 31A. This allows the operator to loosen the connecting member 44 and pivot the damper plate 31, easily changing the tilt angle of the pedal 34 to an angle that suits their own body shape.

[0032] As shown in FIG. 9 , a plate (referred to as a "first plate" in the claims) 37 is provided on the upper part of the damper plate 31, extending leftward and below the pedal 34. Mounting holes 37A are formed in the plate 37 at a predetermined interval in the left-right direction, and a rubber elastic member 38 extending vertically is inserted into the left mounting hole 37A. The height of the portion of the elastic member 38 that extends upward from the upper surface of the plate 37 is set to a height that prevents contact between the lower surface of the pedal 34 and the flange 41 when the operator strongly presses down on the pedal 34, thereby preventing contact between the lower surface of the pedal 34 and the flange 41 of the damper 32. This prevents contact between the lower surface of the pedal 34 and the flange 41 of the damper 32, even when the operator strongly presses down on the pedal 34, thereby reliably reducing vibrations from the engine or the like that are transmitted to the pedal 34 via the continuously variable transmission 25A or the like.

[0033] As shown in Fig. 10, the damper body 40 is disposed so as to overlap the pedal 34. This prevents the damper body 40 from being significantly bent or twisted when the operator depresses the pedal 34, thereby preventing early deterioration of the performance of the damper body 40. Furthermore, the damper body 40 extends to the left of the center of the pedal 34 in the left-right direction. This further reduces vibrations from the engine and the like that are transmitted to the pedal 34 via the continuously variable transmission 25A and the like.

[0034] <Forward accelerator pedal of the second embodiment> 11 , the forward accelerator pedal 21 of the second embodiment is formed from an arm 50 whose lower part is fixed to the support shaft 20 and extends forward and upward, a lower damper plate 51 that extends leftward from the upper part of the arm 50, a damper 52 such as vibration-isolating rubber that is disposed on the upper surface of the damper plate 51, an upper damper plate 53 that is disposed on the upper surface of the damper 52, and a pedal 54 that is disposed above the damper plate 53. The lower part of the pedal 54 engages with the outer periphery of the damper plate 53 and is detachably fixed to the damper plate 53.

[0035] Insertion holes 51A are opened at a predetermined interval in the left-right direction in the center of the damper plate 51 in the front-to-rear direction, insertion holes 52A are opened at a predetermined interval in the left-to-right direction in the center of the damper 52 in the front-to-rear direction, and insertion holes 53A are opened at a predetermined interval in the left-to-right direction in the center of the damper plate 53 in the front-to-rear direction.

[0036] Damper 52 is disposed between damper plate 51 and damper plate 53, and is fixed by fixing members 55, such as bolts, inserted from top to bottom through insertion holes 53A and the like. The diameter of fixing members 55 is smaller than the diameters of insertion holes 51A, 52A, and 53A. This reduces vibrations from the engine and the like that are transmitted to pedal 54 via continuously variable transmission 25A and the like.

[0037] Additionally, stays 56 extending upward are provided on both sides of the upper surface of the damper plate 51. As a result, both left and right sides of the damper 52 come into contact with the stays 56, suppressing misalignment of the damper 52 and reliably reducing vibrations of the engine and the like that are transmitted to the pedals 54 via the continuously variable transmission 25A and the like.

[0038] <Forward accelerator pedal of the third embodiment> 12, the forward accelerator pedal 21 of the third embodiment is formed from an arm 60 whose lower part is fixed to the support shaft 20 and extends forward and upward, a lower damper plate 61 that extends leftward from the upper part of the arm 60, a damper 62 such as a vibration-isolating rubber that is inserted into a mounting hole 61A formed in the center of the damper plate 61, an upper damper plate 63 that is disposed on the upper surface of the damper 62, and a pedal 64 that is disposed above the damper plate 63. The lower part of the pedal 64 engages with the outer periphery of the damper plate 63 and is detachably fixed to the damper plate 63.

[0039] An insertion hole 62A is formed in the center of the damper 62, and a cylindrical collar 66 is inserted into the insertion hole 62A. Also, an insertion hole 63A is formed in the center of the damper plate 63.

[0040] The damper 62 is disposed between the damper plates 61 and 63, and is fixed by a fixing member 65 such as a bolt that is inserted downward through an insertion hole 63A or the like. The diameter of the fixing member 65 is smaller than the inner diameter of the collar 66. This reduces vibrations from the engine and the like that are transmitted to the pedal 64 via the continuously variable transmission 25A or the like.

[0041] Similarly to the forward accelerator pedal 21, it is preferable to interpose a damper 32 or the like between the arm 30 or the like and the pedal 34 or the like for the reverse accelerator pedal 22, which is depressed less frequently than the forward accelerator pedal 21. This reduces vibrations from the engine or the like that are transmitted to the pedal of the reverse accelerator pedal 22 via the continuously variable transmission 25A or the like. [Explanation of symbols]

[0042] 1 Aircraft frame 2 front wheels 3 rear wheels 6 Control Unit 18 floors 19 Accelerator pedal 25 Mission Case 26 Trunnion axis (rotating axis) 30 Arm 31 Damper plate (first connecting plate) 31A long hole 32 Damper 33 Pedal arm (second connecting plate) 34 pedals 35 Stopper plate (second plate) 36 Stopper pin 37 Plate (1st Plate) 38 Elastic member 40 Damper body 41 flange 42L Stud bolt (left connecting member) 42R Stud bolt (right connecting member) 44 Connecting member 50 Arm 52 Damper 54 pedals 60 Arm 62 Damper 64 pedals

Claims

1. A work vehicle having a pair of left and right front wheels (2) and rear wheels (3) mounted below a body frame (1) on which an engine is mounted, and a control section (6) on which a worker rides mounted above the body frame (1), An accelerator pedal (19) for operating a transmission case (25) for increasing or decreasing the output rotation of the engine is provided on a floor (18) of the operation section (6), The accelerator pedal (19) is formed by an arm (30, 50, 60) extending in the vertical direction and a pedal (34, 54, 64) that the operator presses down, A work vehicle characterized in that a lower portion of the arm (30, 50, 60) is connected to a rotation shaft (26) of a transmission case (25), and an upper portion of the arm (30, 50, 60) is connected to a lower portion of a pedal (34, 54, 64) via a damper (32, 52, 62).

2. A first connecting plate (31) having a predetermined length in the vertical and longitudinal directions is provided on the upper part of the arm (30), A second connecting plate (33) having a predetermined length in the vertical and longitudinal directions is provided below the pedal (34), The damper (32) is formed of a damper body (40) having a longitudinal direction in the left-right direction, flanges (41) on both sides of the damper body (40), and a left connecting member (42L) and a right connecting member (42R) extending in the left-right direction from the flanges (41), 2. A work vehicle according to claim 1, wherein a right connecting member (42R) is connected to the first connecting plate (31), and a left connecting member (42L) is connected to the second connecting plate (33).

3. 3. A work vehicle according to claim 2, wherein a damper body (40) is disposed within the outer periphery of the pedal (34) in a plan view.

4. A first plate (37) is provided on an upper portion of the first connecting plate (31) and extends to the left side below the pedal (34), 4. A work vehicle according to claim 3, wherein the first plate (37) is provided with an elastic member (38) extending in the vertical direction.

5. A stopper pin (36) is provided on the upper surface of the floor (18), A second plate (35) extending toward the left side is provided below the first connecting plate (31), 5. A work vehicle according to claim 3, wherein when the pedal (34) is depressed to a predetermined degree or more, the second plate (35) abuts against a stopper pin (36).

6. a circumferential elongated hole (31A) is opened in the first connecting plate (31) at a position radially spaced a predetermined distance from the right connecting member (42R) when viewed from the axis of the right connecting member (42R); 6. A work vehicle according to claim 5, wherein a connecting member (44) that connects the arm (30) and the first connecting plate (31) is inserted through the elongated hole (31A).

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