JPS6143658Y2 - - Google Patents

Description

[Detailed explanation of the invention] In the steering device of conventional mobile agricultural machinery, the pitman arm operated at a constant rate relative to the amount of operation of the handle, so the left and right steering wheels did not tilt or the plow If the field is extremely uneven, such as on a tiller in a plowed field, the running wheels will deviate to the left or right, making it easy for the steering wheel to be taken off, causing the machine to meander. bends. In addition, even with other work machines, it was not possible to perform straight forward work in an orderly manner.

Furthermore, in the above-mentioned conditions, it takes a great deal of gripping force to hold the handle so that it does not get taken off in order to move the machine straight ahead, and in particular all-wheel-drive mobile agricultural machines that require a lot of operating force even under normal conditions must be used in wet conditions. When driving at low speeds in Tanaka, the steering wheel becomes abnormally heavy, and there are times when it is unavoidable to cut off front wheel drive and use rear wheel drive only.

In particular, if one of the wheels suddenly enters a depression on the plowing platform or the ground surface, or rides on a convex part, the operator will operate the steering wheel under the illusion that the aircraft's direction of travel has turned. At that time, when the steering wheels changed the direction of travel, similar to when driving on the road, the aircraft meandered and could no longer travel straight.

The present invention stops the work machine by switching the steering speed change device attached to the steering device, and when turning the machine on a headland or driving on the road, the machine can be quickly steered in the same manner as before. When working by driving the work equipment, it is possible to easily maintain straight running with a small amount of force even in poor field conditions, and moreover, the gear shift operation of the steering transmission device can be specially performed. It is an object of the present invention to provide a steering/transmission device for a mobile agricultural machine which can be operated with one touch in conjunction with at least the engagement and disengagement of a working machine clutch.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1 is a tractor having front wheels 2, 2 and rear wheels 3, 3, and the front wheels 2, 2 are connected to a steering shaft 5 by a handle 4, and a steering gear. Steering is performed via the transmission 7 in the box 6, the pitman arm 8, the drag link 9, the knuckle arm 10, the tie rod 11, etc.

Reference numeral 12 denotes a planting device mounted on the rear of the tractor 1 so as to be movable up and down by a quadruple link 13. When the hydraulic lift lever 14 is tilted back and forth, it is raised and lowered by the hydraulic device.
The seedlings are reciprocated from side to side via the universal joint 17, input shaft 18, etc., and the seedlings stored on the seedling stand 15 are planted one by one on the rice field by the planting rod 19, which moves up and down at a fixed position.

Further, the PTO shaft 16 has dog teeth and is connected to the engine 20 through the transmission.
A sprocket 21 driven by the sprocket 21 is loosely fitted, and a working machine clutch 22 that engages and disengages from the dock teeth of the sprocket 21 is spline-fitted to the PTO shaft 16, and is directed toward the dock teeth of the sprocket 21 by the spring a. Shifter 2
3 is connected to a work machine clutch lever 26 via an arm 24 and an operating wire 25 that rotate integrally with the work machine clutch lever 26.
is connected to.

The transmission device 7 includes a shift gear 27 which is integrally formed with a large diameter gear 27a and a small diameter gear 27b which are spline-fitted to the steering shaft 5 so as to be movable up and down.
, a high-speed gear 28 fixed to the steering worm shaft, and a low-speed gear 29, and the shift gear 27 is connected to a stopper 3 made of a C-shaped ring.
The vertical movement range is limited by 0 and 31, and the bullet is biased upward by the bullet b.

Further, an L-shaped shifter 32 for vertically moving the shift gear 27 is connected to the working machine clutch lever 26 by a rod 33 via a bullet c.

Therefore, when the work machine clutch lever 26 is set to the engaged position as shown by the solid line in FIG. 2 in order to perform the planting work, the operating wire 25 is relaxed and the shifter 23 rotates counterclockwise in the figure, so that the work can be done. The machine clutch 22 is engaged and the planting device 12 is driven.

At the same time, the work machine clutch lever 26 pulls the rod 33 rearward, so the shifter 32 rotates counterclockwise to lower the shift gear 27 and engage the small gear 27b with the low speed gear 28. As a result, the amount of operation of the handle 4 is controlled by the Pittman arm 8.
This will be communicated in a small way.

Further, when the work equipment clutch lever 26 is tilted backward, the arm 24 is pulled up by the operating wire 25 and rotated upward, and the shifter 23 moves the work equipment clutch 22 forward against the ammunition a to cut it. At the same time, the rod 33 is pushed forward, so the shift gear 27 is pushed up by the bullet b, and the large diameter gear 27a meshes with the high speed gear 28. At that time, if the tooth traces of the gears 27a and 28 do not match, a slight rotation of the handle 4 will cause the tooth traces to match, and they will mesh quickly, making the operation of the handle 4 sensitive under normal conditions. It can be transmitted to Pittman Arm 8.

Since the bullet c attached to the rod 33 is set to be stronger than the bullet b, the shift gear 27
When the small diameter gear 27b is moved downward to mesh with the low speed gear 29, those gears 27b, 2
When the gears 9 are not engaged and are caught, the bullet c is compressed, but the shift gear 27 itself is biased downward by the bullet c, and in this state, the handle 4 is rotated to shift the teeth of both gears. When the lines match, the bullet C becomes the bullet B
Push down the shift gear 27 against the small diameter gear 2
7b is meshed with the low speed gear 29.

In addition, in the drawing, 34 is a differential mechanism, 25 is a bevel shaft, and 36 is a center pin.

Reference numeral 37 is a stopper provided at a position facing the working machine clutch 22, and when the working machine clutch 22 is disengaged and moved to the right in FIG.
The spring d is compressed, and when the stopper 37 aligns and engages with the notch 22' of the flange, the working implement clutch 22 is disengaged and the planting rod 19 is stopped at the raised position.

As mentioned above, a steering and transmission device is interposed in the interlocking mechanism between the steering handle and the Pittman arm,
The steering speed change device is configured to change the amount of operation of the Pitman arm due to the operation of the steering speed change device, and the steering speed change device is configured to include a pair of high speed gear and low speed gear;
It consists of a shift gear that selectively meshes with those gears and integrally combines large and small gears, and the outer end of the shifter that engages with the shift gear is connected to a rod whose rear end is locked to the work equipment clutch lever. The front part is connected to move forward and backward, and a bullet c is interposed between the shifter and the rod so that the shift gear moves only in one direction, and the bullet c is connected to the shift gear.
When the work machine clutch lever is intermittently operated by attaching a bullet b that moves and biases in the opposite direction, the two bullets actuate the shift gear, so the work machine clutch 22 is engaged. When the work machine clutch lever 26 is set to the engaged position to perform rice planting work or plowing work, the power of the prime mover is transmitted to the work machine, and at the same time, the work machine clutch lever 26 is connected to the steering gear shift device in the steering device. If the operator operates the handle 4 at normal intervals due to sudden changes in the height of the tiller, etc., causing the operator to think that the aircraft's direction of travel has curved, the amount of rotation of the pitman arm 8 will change. As a result, the amount of direction change of the steering wheels becomes smaller, and even if the plowing platform or ground surface undergoes a series of rapid changes in elevation, the meandering of the machine body is extremely small, and work can be carried out in an orderly manner while traveling straight ahead.

In addition, the force transmitted from the wheel side to the steering wheel is small, allowing light steering without the need for the steering wheel to be taken off.

Furthermore, when the work machine clutch lever 26 is set to the disengaged position when traveling on the road, the amount of operation of the handle 4 is sensitively transmitted to the pitman arm 8, allowing safe high-speed travel.

In addition, there is no need to specially operate the steering/transmission device, and the gears can be changed simply by operating the work machine clutch lever 26, so there is no need to pay any consideration to the steering/transmission operation, and the user can concentrate on steering/maneuvering. be able to.

In addition, it is not necessary to attach a switching means such as a dog clutch to the steering and transmission device 7, thereby reducing costs. In addition, even when the tooth traces of the gears that mesh with each other do not match, when the handle 4 is operated, the bullets b, c Due to the elastic biasing, it is possible to mesh easily and perform steering operations with high sensitivity.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a partially cutaway side view of the mobile agricultural machine, Figure 2
The figure is a side view of the main part showing a partial cross section, and FIG. 3 is a front view showing a partial cross section of the front wheel drive section. 2...Front wheel, 4...Handle, 7...Steering transmission, 8...Pittman arm, 9...Drag link, 22...Work machine clutch, 25...Operation wire, 26...Work machine clutch lever, 2
7...Shift gear, 28...High speed gear, 29...
low speed gear.

Claims (1)

[Scope of utility model registration request] A steering speed change device is interposed in an interlocking mechanism between the steering handle and the Pittman arm, and the steering speed change device is configured to change the amount of operation of the Pittman arm by operation of the steering speed change device, and the steering speed change device is configured to:
It consists of a pair of high-speed gears and low-speed gears, and a shift gear that selectively meshes with these gears and integrally combines large and small gears, and the rear end operates the outer end of the shifter that engages with the shift gear. The front part of the rod, which is locked to the machine clutch lever, is connected to move forward and backward, and a bomb c is interposed between the shifter and the rod so that the shift gear moves only in one direction,
The shift gear is provided with a bullet b that urges the shift gear to move in a direction opposite to the bullet c, and when the working machine clutch lever is operated intermittently, the two bullets operate the shift gear. A steering and transmission device for a mobile agricultural machine characterized by: