JP2002145026A - Pedal supporting structure for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pedal supporting structure capable of preventing misoperation and exhibiting excellent operatability for a tractor having both of advancing and retreating pedals and left and right brake pedals. SOLUTION: Both of the advancing pedal 30 and the retreating pedal 31 are installed on a floor 2, and both of the left and right brake pedals 4L and 4R for braking rear wheels at left and right are installed over them. In order to install the both kinds of the pedals adjacently vertically, the left and right brake pedals 4L and 4R are located apart from one of the advancing and retreating pedals 30 and 31 along the lateral direction. Further, the pedals are set so that the stepping surface of the pedals 4L and 4R and the stepping surface of the advancing pedal 30 or the retreating pedal 31 is on an almost a same surface when the brake pedal 4L or 4R is stepped on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a forward and backward pedal and a left and right brake pedal of a working vehicle.

[0002]

2. Description of the Related Art
As shown in Japanese Patent Application Laid-Open No. 2-68228, there is known an agricultural tractor in which a forward pedal for switching the traveling direction of a vehicle between forward and reverse and a reverse pedal are provided so as to be rotatable downward. I have. Further, as disclosed in Japanese Patent Application Laid-Open No. 12-128924, there is known a tractor that is used as a lawn mower by changing a working machine by sharing a transmission device or a transmission case inside a transmission. ing.

However, when the tractor is used for agriculture as described above, it is desirable that the tractor be provided with a left and right brake pedal for independently braking the rear wheels so as to make a small turn in the field. However, when the tractor is used as a lawn mower, there is a problem that the lawn may be damaged if the brake pedal is operated incorrectly.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pedal support structure which has as little erroneous operation as possible and has good operability when a vehicle is provided with both a forward-reverse pedal and a left-right brake pedal.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has a pedal support structure for a work vehicle as follows. That is, according to the first aspect of the present invention, the forward pedal 30 and the reverse pedal 31 for switching the traveling direction of the vehicle between forward and backward are provided on the floor 2 having the cockpit 15 so as to be rotatable downward. The left and right driving wheels 26 of the vehicle are independently braked above the forward pedal 30 and the reverse pedal 31, respectively, or are integrally connected by the connecting means 5 to simultaneously brake the left and right driving wheels 26. A work vehicle having both brake pedals 4L and 4R,
Of the left and right brake pedals 4L, 4R, one of the brake pedals 4L (4R) located outside the vehicle body is
A pedal support structure for a working vehicle, characterized in that one of the forward / backward pedals 30, 31 is disposed close to one of the forward or reverse pedals 30 (31) located inside the vehicle body, with their left and right positions overlapping. And

According to the second aspect of the present invention, the forward pedal 30 and the reverse pedal 31 are provided with first biasing means 45 for returning to a neutral position where no propulsive force is applied to the vehicle body, and the brake pedals 4L and 4R are provided with first biasing means 45. Also, there are provided second urging means 9, 9 for urging to the non-braking position, and when the brake pedals 4L, 4R are depressed, the brake pedals 4L, 4R are depressed.
The pedal support structure for a working vehicle according to claim 1, wherein the stepped surface of R and the stepped surface of the forward pedal 30 or the reverse pedal 31 in the neutral position are set to form substantially the same plane.

[0007]

According to the first aspect of the present invention, the pedal support structure for a working vehicle according to the present invention is provided with a forward-reverse pedal 4L, 4R.
When the left and right brake pedals 30 and 31 are disposed close to each other and compactly arranged, and when the left and right independent brakes are not required, the two brake pedals 4L and 4R are connected so that the left and right positions of the forward and backward pedals 30 and 31 do not overlap. The position of the brake pedal 4L,
There is no danger that the 4R will be depressed and the forward / reverse pedals 30, 31 will be depressed.

In the pedal support structure for a working vehicle according to the second aspect, the brake pedals 4L and 4R are depressed,
Then, when the stepping is released, the operator's foot only needs to be shifted downward, so that, especially when starting / stopping or turning / straight running is repeated, labor is saved and operability is improved.

[0009]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a tractor 10 as an example of a work vehicle. An engine 11 is mounted on a front part of the fuselage, covered with a hood 12, a transmission case 13 is attached to a rear part of the fuselage, and a cabin 14 is
And a driver's seat 15 is provided in the cabin 14.

As shown in FIGS. 1 and 2, a clutch housing 16 is mounted on a rear portion of the engine 11, and a main clutch 17 is provided inside the clutch housing 16. Clutch housing 16 and transmission case 1
An additional transmission case 18 is interposed between the transmission unit 3 and the transmission unit 3, and a hydrostatic continuously variable transmission (HST) 19 is provided in the additional transmission case 18. The rotational power of the engine 11 is input to the HST 19 via the main clutch 17, and after being continuously shifted by the HST 19, the gear type transmission device 20 provided in the transmission case 13 is provided.
It is configured to be transmitted to.

The HST 19 includes a variable hydraulic pump 21 driven by the rotational power of the engine 11 and a hydraulic motor 22 driven by the hydraulic pump 21. A forward pedal 30 or a reverse pedal 31 described later is provided. When the trunnion shaft 23 is rotated by depressing, the discharge amount of the hydraulic pump 21 is changed, and the rotation speed of the hydraulic motor 22 changes steplessly. The rotation of the hydraulic motor is transmitted to a drive shaft 25 via a reduction gear mechanism 24 provided in front of the HST 19, and after being shifted by a rear gear type transmission 20, power of the traveling system is transmitted via a rear differential 27R. Wheel 26
Is driven, and the front wheels 28 are driven via the front differential device 27F. On the other hand, the power of the PTO system is taken out from the PTO output shaft 29 protruding from the rear surface of the transmission case 13.

FIGS. 3 and 4 show the mounting structure of the forward pedal 30 and the reverse pedal 31 for operating the HST 19, and the left and right brake pedals 4L and 4R for independently braking the rear wheel 26 on the left and right. The support structure of the forward pedal 30 is provided with an opening 32 on one side surface of the additional transmission case 18, and a bracket 33 is attached to the opening 32 so that the trunnion shaft 23 projects outside. A pedal support shaft 34 is fixed to the tip of the trunnion shaft 23 on the same axis as the trunnion shaft 23, and is supported by a bracket 33 so that the trunnion shaft 23 and the pedal support shaft 34 can rotate integrally. At the same time, the forward pedal 30 is
Is fixed.

A boss 35 is pivotally attached to the tip of the pedal support shaft 34, and a plate 36 is fixed to the boss 35. The reverse pedal 31 is fixed to the plate 36. As a result, the forward pedal 30 becomes the reverse pedal 31
And the pedaling surface is formed at the same height, and the reverse pedal 31 rotates about the pedal support shaft 34 together with the boss 35, so that the rotation of the forward pedal 30 The center of movement and the center of rotation of the reverse pedal 31 coincide, and the radius of rotation of the tread surface is the same. Also,
An arm 37 is fixed to the base end of the pedal support shaft 34.

Here, a link support shaft 38 is pivotally attached to the bracket 33 in parallel with the pedal support shaft 34, and an arm 39 is fixed to one end of the link support shaft 38. The plate 36 is connected to the link rod 4
Connect at 0. On the other hand, an arm 41 is fixed to the other end of the link support shaft 38, and the arm 37 of the pedal support shaft 34 is fixed.
And this arm 41 are connected by a link rod 42. Thus, the forward pedal 3 supported by the pedal support shaft 34
The zero and the reverse pedal 31 are connected to the trunnion shaft 23 by a link mechanism including a link support shaft 38 and link rods 40 and 42 provided in parallel with the pedal support shaft 34.

When the forward pedal 30 is depressed, the forward pedal 30 is directly used by the pedal support shaft 3.
4 rotates and the trunnion shaft 2 is integrated with the pedal support shaft 34.
3 rotates in the direction of arrow F, and the HST 19 is driven by forward rotation. On the other hand, when the reverse pedal 31 is depressed,
The boss 35 and the plate 36 are rotated in the direction of arrow F by the reverse pedal 31, and the link rod 40 is pulled, so that the link support shaft 38 is rotated in the opposite direction to the pedal support shaft 34. Accordingly, the link rod 42 is pushed, and the pedal support shaft 34 rotates in the direction of arrow R, and the trunnion shaft 23 also rotates in the same direction integrally with the pedal support shaft 34, and the HST 19 is driven by the reverse rotation. .

In the vicinity of the other end of the link support shaft 38,
A cam 43 having a V-shaped recess is fixed, and a roller 44 pivotally attached to the transmission case 13 is pressed against the cam 43 by the bias of a spring 45. Further, an arm 46 is fixedly provided near one end of the link support shaft 38, and a damper 47 is connected thereto. When the link support shaft 38 rotates, the swing of the cam 43 is returned by the action of the damper 47. Depress the forward pedal 30 or the reverse pedal 31 (in the figure, dashed-dotted line B
The roller 44 returns to the center of the concave portion of the cam 43, and when the pedal is released, the respective pedals 30 and 31 return to the original neutral position where the propulsion force is not applied to the vehicle body (the dashed line A in the figure). Position) and is held.

As described above, the center of rotation of the forward pedal 30 and the center of rotation of the reverse pedal 31 coincide with each other, and the turning radius of the depression portion is the same.
0 and the depression stroke of the reverse pedal 31 are the same, and there is no uncomfortable feeling in pedal operation. Also,
Since the pedal support shaft 34, the link support shaft 38, and the link mechanism are mounted on the bracket 33 in an assembled state, the assembling work to the transmission case 13 is extremely easy.

A cruise control wire 48 is connected to the arm 41 so that the forward pedal 3
The predetermined speed can be maintained by setting the cruise control lever 49 at hand to a desired position while depressing "0" to a predetermined value. The base of the lever 49 is provided with a braking spring 50 so that the lever 49 can be positioned. That is, the swinging plate 51 cooperating with the end of the wire 48
Is configured to be held by a braking spring 50. The lever 49 is connected to the swing plate 51 in an interlocking manner, and the lever 49 is rotated around a fulcrum a against the braking spring 50 to achieve a desired speed. It is configured to obtain.

Next, the control of the HST 19 will be described. As described above, the HST 19 includes the variable hydraulic pump 21 and the hydraulic motor 22 driven by the hydraulic pump 21, and switches the tilt angle of the internal swash plate of the hydraulic motor 22 in two stages. The hydraulic pump 2
The rotation of the hydraulic motor 22 can be changed to high torque or low torque in accordance with the discharge amount of (1). Conventionally, the shift shock was large because the solenoid valve was switched automatically or manually. However, the hydraulic pump was switched at the moment when the internal swash plate of the hydraulic motor 22 was switched by the motor switch (not shown) provided on the meter panel. By changing the discharge amount of the output shaft 21 and adjusting the rotation speed of the output shaft to the rotation speed immediately before the motor switching, the change in vehicle speed before and after the shift is small, and the shift shock can be suppressed.

Next, the left and right brake pedals 4L and 4R for independently braking the left and right rear wheels 26 will be described. In the support structure for the brake pedals 4L, 4R, a support shaft 6 is provided laterally from a handle post 7 for supporting the steering handle 3, and an arm base of the pedals 4L, 4R is pivotally connected to an end of the support shaft 6. To wear. A rotary connection plate 5 serving as connection means for the left and right brake pedals 4L and 4R is provided on the arm portion of the left brake pedal 4L.
And the plate is rotated in a horizontal state so that the plate is locked to the arm of the right brake pedal 4R.

Here, the left rear wheel brake pedal 4L is supported on the inside of the vehicle body and the right rear wheel brake pedal 4R is supported on the outside, so that the left and right positions are overlapped above the stepping surface of the right rear wheel brake pedal 4R. Thus, the stepping surface of the forward pedal 30 is arranged.

The bases of the brake pedals 4L and 4R are provided with springs 9 as biasing means for returning the pedal positions to the non-braking position (the position indicated by the dashed line C in the figure).
9 is connected, and the maximum stepping position (the position of the dashed line D in the figure)
It is set to step down. When the brake pedal 4R (4L, 4R) is depressed, the depressed surfaces of the right brake pedal 4R and the forward pedal 30 are substantially flush with each other so that the operator's foot is applied to both pedal surfaces. I have.

The support structure of the front and rear wheel pedals 30, 31 and the brake pedals 4L, 4R of the tractor 10 configured as described above is such that the forward / backward movement pedals 4L, 4R and the left and right brake pedals 30, 31 are vertically adjacent to each other. In the case where the brakes are arranged compactly and independent left and right independent brakes (single brakes) are not required, for example, in lawn mowing work, both brake pedals 4L and 4R are connected so that the forward and backward pedals 30 and 31 do not overlap the left and right positions. That is, since the left rear wheel brake 4R can be depressed, the brake pedal 4R can be operated.
There is no danger of the L and 4R being missed and the forward and backward pedals 30, 31 being operated by mistake.

When depressing both brake pedals 4L, 4R or one of the brake pedals 4L (4R) and then releasing the depression, it is only necessary to move the operator's foot downward as it is. When stopping or turning / straight-forwarding is repeated, labor is saved and operability is good.

The present invention can be variously modified without departing from the spirit of the present invention. In particular, each of the brake pedals 4L, 4R and the forward / reverse pedals 30, 31 has a left-right position or a vehicle body. It is natural that the left and right positions with respect to are modified.

[Brief description of the drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 shows an embodiment of the present invention and is a side view of a tractor.

FIG. 2 is a developed longitudinal sectional side view showing the configuration of an HST and a transmission case.

FIG. 3 is a side view showing a mounting structure of a forward pedal and a reverse pedal.

FIG. 4 is a partially cutaway rear view showing a mounting structure of a forward pedal and a reverse pedal.

[Explanation of symbols]

 2 floor 4 brake pedal 4L left rear wheel brake pedal 4R right rear wheel brake pedal 5 connecting plate 6 brake pedal support shaft 9 brake pedal base spring 10 tractor 15 cockpit 30 forward pedal 31 reverse pedal 45 forward and backward pedal neutral return Spring for

Claims (2)

[Claims] 1. A forward pedal 3 for switching the traveling direction of a vehicle between forward and reverse on a floor 2 provided with a cockpit 15.
0 and a reverse pedal 31 are provided so as to be rotatable downward, and the left and right drive wheels 26 of the vehicle are independently braked above the forward pedal 30 and the reverse pedal 31, respectively. Left and right brake pedals 4 that are integrally connected by 5 to simultaneously brake the left and right drive wheels 26
L and 4R, wherein one of the left and right brake pedals 4L and 4R, which is located outside the vehicle, is connected to the front and rear pedals 30 and 31 by the vehicle body. A pedal support structure for a working vehicle, wherein the right and left positions are overlapped and arranged close to one of the forward or reverse pedals 30 (31) located inside. 2. The forward pedal 30 and the reverse pedal 31.
Is provided with first biasing means 45 for returning to a neutral position where no propulsive force is applied to the vehicle body, and the brake pedals 4L, 4R
In addition, the second urging means 9, 9 for urging to the non-braking position are provided, and when the brake pedals 4L, 4R are depressed, the depression surfaces of the brake pedals 4L, 4R and the forward pedal 30 in the neutral position are provided. 2. The pedal support structure for a working vehicle according to claim 1, wherein the stepped surface of the reverse pedal 31 is set to form substantially the same plane.