JPH0224265A - Front/back reversing device for tractor - Google Patents

Abstract

PURPOSE:To prevent the interference of the back portion of an operator's seat with a steering wheel at the time of turning back the seat by longitudinally rotatably providing the operator's seat while forwardly tiltably providing the front steering column on which the steering wheel is installed. CONSTITUTION:A column 4 for supporting an operator's seat 3 is erected nearly on the center portion of the floor face in the operator's cab 2 of a tractor 1 and an operator's seat 3 is pivotally provided rotatably in the longitudinal direction on the upper portion of the column 4. A rear operating portion 6 is fixed to the rear of the operator's cab 2 and a rear steering wheel 7 which is pivotally installed on this operating portion 6 is placed in such a way that it is not brought into contact with the back portion 3a of the operator's seat 3 at the time of fixing the operator's seat 3 faced forward. On the other hand, a front steering wheel 8 is pivotally rotatably installed on a steering column 9 erected on the front lower portion of the operator's cab 2 and the steering column 9 is provided forwardly tiltably in a body with the front steering wheel 8 around a rotary shaft 9a.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a front-back reversing device for a tractor, and in particular, a front-back reversing device for a tractor that facilitates the reversing of a driver's seat. It is related to the device.

[Prior Art] Among the various types of agricultural work performed using a tractor, there are some, such as loader work and shovel work, in which the tractor is driven in a backward direction. In such cases, it is difficult to operate the tractor in the normal driving position, so a driving control unit is installed in the rear of the driver's cab facing backwards, and the driver's seat is reversed so that the tractor can handle the work. It is being The longitudinal reversing device for this type of tractor removes the steering wheel and driver's seat, inverts the driver's seat and fixes it in a predetermined position, and then attaches the steering wheel to a steering wheel mounting shaft provided in the rear operation section. It was adapted for backward-facing driving work.

[Problems to be Solved by the Invention] With the above-mentioned conventional front-rear reversing device for tractors, it is troublesome to remove the driver's seat and steering wheel, and it takes a considerable amount of time. .

Therefore, a technical problem has arisen that must be solved in order to simplify this back-and-forth reversal operation, and it is an object of the present invention to solve this problem.

[Means for Solving the Problems] The present invention has been proposed to achieve the above object, and includes driving operation sections provided back to back on both the front and rear sides of the driver's cab, and a driver's seat located between the driving operation sections. In a tractor that can be operated forward or backward by being mounted facing one side, the driver's seat is formed so as to be freely rotatable in the front-rear direction using the driver's seat support as a rotation axis; , characterized in that the front steering column to which the steering wheel is attached is formed so that the side entrance can be opened forward, and the back surface of the steering column is formed so as not to interfere with the steering wheel when the driver's seat is facing rearward. The longitudinal reversing device in a tractor that operates and the longitudinal reversing device in the tractor electrically connects a steering gear device that engages with the front wheels and a front operating section and a steering mechanism of a rear operating section. , A longitudinal reversing device for a tractor, characterized in that the steering gear device is actuated by an electric signal transmitted from a steering mechanism of the rear driving operation section to perform a steering turn. We aim to provide the following.

[Function 1] The present invention has driving operation units with steering wheels attached to both the front and rear sides of the driver's cab placed back to back, and a column for supporting the driver's seat erected on the floor in the center of the driver's cab. ing. Since the driver's seat is pivotally attached to the pillar so that it can be rotated in the longitudinal direction, it is possible to operate the driver's seat both forward and backward by facing both the front and rear driving operation parts without removing the driver's seat. I can do it. In addition, since the steering column to which the steering wheel of the front driving operation section is attached is formed so that the side entrance can be opened forward, when the driver's seat is facing the rear driving operation section, the back side of the driver's seat is There is no risk of interference with the steering wheel.

Further, the hydraulic mechanism of the steering gear device is connected to the steering gear device connected to the steering wheel of the front driving operation unit and converts the rotational movement of the steering wheel into steering turning motion of the front wheels by an electric signal. An electric circuit is provided to operate the operating parts such as. On the other hand, the rear operation section provided at the rear of the driver's cab is comprised of a steering wheel, a brake pedal, an accelerator pedal, etc., which are housed in a housing attached to a predetermined position. The steering wheel of the rear operation unit is gear-coupled to a variable resistor such as a potentiometer provided in the housing so that changes in the rotation angle of the steering wheel are extracted as changes in current, and By electrically connecting the resistor and the receiving circuit of the steering gear device with a signal cable, it is possible to turn the steering wheel of the front wheels by rotating the steering wheel of the rear driving operation section. be.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, conventionally known techniques will also be explained at the same time. In FIGS. 1 and 2, (+) represents a tractor. A column (4) for supporting the driver's seat (3) is erected approximately at the center of the floor surface in the driver's cab (2) of the tractor (+). A driver's seat (3) is pivotally attached to the upper part of the support column (4) so as to be rotatable in the front and rear directions, and is fitted with a locking device (not shown) so as to be fixed in the forward and rearward positions. ) are decorated. The locking device is configured such that when a lock release pedal (5) provided at the front lower part of the driver's cab is stepped on, the driver's seat (3) is unlocked, flipped forward or backward, and fixed in a fixed position. has been done.

In addition, there is a rear driving operation section (6) at the rear of the driver's cab (2), which will be described later.
is fixed to the rear steering wheel (η) which is pivotally connected to the rear driving operation part (6).
) is arranged so as not to come into contact with the back surface (31) of the driver's seat (3) when it is fixed facing forward.

On the other hand, the front steering wheel (8) is located in the driver's cab (2).
As shown in FIG. 3, the front axle (12 The steering gear device (1→) provided in front of the vehicle is connected to perform steering operations.

Moreover, as shown in FIG. 2, the steering column (9)
is provided with a rotating shaft (9a) at its lower part, and is formed so as to be able to move forward integrally with the front steering wheel (8). Therefore, when flipping the driver's seat (3) backwards, by moving the steering column (9) forward, the front steering wheel (8) will move to the back surface (31) of the driver's seat (3). On the other hand, as shown in Figure 4, the rear driving operation section (6) is a housing with various operation sections such as a throttle lever (B) and a forward/reverse lever 0→ on its front. The rear steering wheel (7) is rotatably pivoted at the center of the body. Further, a support part (g) for an accelerator pedal (1G) and a brake pedal (rh) is extended from the lower part of the vehicle to form an integrated driving operation section that includes all the operation sections.

Here, the action of the rear steering wheel (7) is
This will be explained according to the diagram. Rear steering wheel (7)
Steering shaft fitted with (Fl is the bearing part (to)
A pinion gear 021) is fitted to the tip of the pinion gear 021).The pinion gear 021) is connected to the rotation axis (Fig. (not shown) meshes with a fan-shaped steering gear (g) fitted on the tip.

Then, if you turn the rear steering wheel (η),
the pinion gear 61), and the steering gear (to)
Due to this action, the steering angle sensor (a) rotates proportionally, changing its electrical resistance value.

Further, a cylindrical steering damper case (b) is interposed between the steering shaft (the bearing part (to) of 11 and the steering angle sensor). The steering damper case (B) is equipped with a straight rack gear (C), and damper springs (1) are installed between both ends of the rack gear (C) and the inner sides of both ends of the steering damper case (?J). ) is interposed. Therefore, the rack gear (c) is always biased to be located at the center of the steering damper case 0) by the action of the damper springs (1) (1). Moreover, since the rack gear (c) meshes with a damper pinion (g) fitted on the rotation shaft of the steering angle sensor (to),
) to the neutral position 6 Therefore, it gives a moderate caster effect to the electrically configured rear steering wheel (η), making the driving operation feel similar to that of the front steering wheel (8), thereby reducing the sense of discomfort. has been resolved.

On the other hand, as shown in FIG. 3, the front wheel steering gear device 0→, which should be electrically connected to the steering angle sensor (2), is equipped with a hydraulic mechanism (not shown), and The flow rate control valve, directional switching valve, etc. of the hydraulic mechanism are electromagnetically operated based on the electrical resistance value of the sensor (2). In addition, in the same figure, the steering gear device (11) is connected to the front wheels (A) and (G), and the front wheels (A) and (G) are connected to the drag link (G) (
A front wheel steering angle sensor 01) is connected to the pitman arm (1) which rotates via the front wheel steering angle sensor 01). The front wheel steering angle sensor 01) changes its electrical resistance value depending on the turning angle of the front wheels, and transmits the electrical resistance value to an electric circuit (not shown), and the steering angle sensor (a) of the rear driving operation section (6) changes its electrical resistance value and transmits it to an electric circuit (not shown). The control current is compared with the transmitted control current to control the hydraulic mechanism, thereby steering the front wheels (A) and (A) in conjunction with the rear steering wheel (7).

In addition, the brake pedal (rt) provided in the rear driving operation section (6) is connected to a rotating shaft (rotation shaft) which is pivotally attached to the lower end of the support part (the rotary shaft (rt) is mounted inside the support part) as shown in FIG. A protruding piece (B) is fixed to (B). The protruding piece (B) is pressed downward by a spring (B), so that the brake pedal (r7) is rotated around the rotation axis (to) as a fulcrum. The tip of the protruding piece (to) comes into contact with the rotary lever (1) of the brake pedal force sensor (g), and the electric resistance value is increased by the pedal force of the brake pedal (r7). This brake pedal force sensor (c) is electrically connected to the hydraulic brake mechanism (b) shown in FIG. Hydraulic cylinder (to) shared with brake pedal OI (to)
B) (to) can be activated to activate brake (4 (to)).

[Effects of the Invention] As described in detail in the above-mentioned embodiment, the present invention is configured so that the tractor driver's seat can be turned back and forth without removing it. In addition, since the steering column to which the front steering wheel is attached can be opened forward, the back side of the driver's seat does not interfere with the front steering wheel when the driver's seat is turned rearward. No need to remove the front steering wheel. Therefore,
When work is performed by reversing the driver's seat back and forth, the reversing work can be performed extremely quickly and easily, thereby contributing to improved work efficiency.

Further, a steering angle sensor is provided on the rear steering wheel, and a front wheel steering angle sensor is connected to the front wheel steering gear device. Since it is equipped with an electric circuit that compares and calculates the electric resistance values of both the steering angle sensor and the front wheel steering angle sensor and operates the steering hydraulic mechanism, the rear steering wheel and There is no need to provide a mechanical linkage between the front wheel steering gear devices. Therefore, it is an invention that can exhibit various effects such as being able to simplify the steering mechanism.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

[Brief explanation of the drawing]

Figures 1 and 2 are side views of the tractor showing the operating state of the main parts, Figure 3 is a plan view showing the front wheel steering mechanism, and Figure 4 (3
) is a front view showing the rear driving operation section, FIGS. 4 to 4 are side views thereof, and FIG.
FIG. 5(c) is a partially cutaway rear view of the same, FIG. 6 is a cutaway side view showing the brake section of the rear driving operation section, and FIG. 7 is an explanatory view of the brake device. 0)・・・Tractor (2)・・・・・・
Driver's cabin (3) --- Driver's seat (6) --- Rear driving operation section (η --- Rear steering wheel (8) ---
... Axis front steering wheel (9) ... Steering column (11 ... Steering gear device (2) ... Steering angle sensor 01) ...
・・・Front wheel steering angle sensor (4) ・・・・Column Diagram 2

Claims (2)

[Claims] (1) In a tractor that has operating control units placed back to back on both the front and rear sides of the operator's cab, and by mounting the driver's seat facing one of the operating units, it is possible to operate the tractor in a forward or backward direction. The driver's seat is formed to be rotatable in the front and back direction using the support of the driver's seat as a rotation axis, and a front steering column to which a steering wheel is attached is formed to be tiltable forward, and the driver's seat is 1. A longitudinal reversing device for a tractor, characterized in that its back surface is formed so as not to interfere with the steering wheel when facing rearward. (2) The longitudinal reversing device in the tractor electrically connects the steering gear device that engages with the front wheels and the front driving operation section to the steering mechanism of the rear driving operation section, and Forward and backward reversal in a tractor according to claim 1, characterized in that the steering gear device is actuated by an electric signal transmitted by a steering mechanism to perform a steering turn. Device.