JPH0746082Y2 - Walk-behind field cultivator - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a walk-type cultivator.

(B) Conventional technology Conventionally, a walk-behind cultivator has a cultivating unit connected to the rear of a self-propelled traveling unit so that the cultivating unit can be swung around an axis in the front-rear direction, and the traveling unit can be tilted left and right. An inclination sensor that detects the angle is provided, and one end of the tillage section is vertically swung based on the detection result of the inclination sensor between the running section and the tillage section, and the tiller section is placed in the set inclination posture. A tilling part posture control means for controlling is provided.

With this configuration, even when the traveling unit travels in the inclined posture, the tilling unit is maintained in the set inclined posture and the tilling operation is performed, and a constant tilling depth can be secured.

(C) Problems to be Solved by the Invention However, the walk-type cultivator has the following problems.

That is, for example, if the wheels on the left side of the traveling unit are located on the already cultivated ground and the wheels on the right side are located on the uncultivated ground,
The wheels on the already cultivated ground are embedded, the left side of the running part is low and the right side is high, and even if the running part is run in this state, the tilling part is set by raising the left side by the tilling part attitude control means. The cultivator operates while it is held in the tilted posture, but when the cultivator is rotated, the traveling part becomes the tilted posture in which the left side is high and the right side is low, contrary to the above, in order to maintain the set tilted posture, There was a problem that the left side of the tillage part that had been raised on the left side was further raised, and the right side part was lowered by that amount, and the already cultivated land was tilled more deeply.

Moreover, there is a risk that the operator's foot may get under the cultivated part and injured.

(D) Means for Solving the Problems Therefore, in the present invention, the tiller is connected to the rear of the traveling unit that is self-propelled so as to be swingable about the longitudinal axis, and
In a walk-behind cultivator formed by extending a pair of left and right handles from the running part to the rear above the cultivating part, the running part is equipped with an inclination sensor that detects the left-right tilt angle of the running part and Between the cultivating section and the cultivating section, one side end of the cultivating section is vertically swung based on the detection result of the tilt sensor to provide a cultivating section horizontal control means for controlling the posture of the cultivating section. The side clutch levers for connecting and disconnecting the side clutches respectively connected to the left and right wheels of the traveling section are attached to the side clutch levers, and a plowing part restoration sensor for detecting the disconnecting operation of each side clutch lever is provided near each side clutch lever. The tilt sensor detection is stopped based on the detection results of each sensor, and the tiller section attitude control means restores the tiller section to a posture substantially parallel to the traveling section. There is provided cents walk-behind tiller, characterized in that the the.

(E) Operational effects According to the present invention, the following operational effects are produced.

That is, in the invention of the present application, the tilling part restoration sensor detects the disconnecting operation of the side clutch lever which is inevitably performed at the time of the turning operation of the aircraft, and the detection of the tilt sensor is stopped based on the detection result of the sensor. The tilling part attitude control means can restore the tilling part to a posture substantially parallel to the traveling part.

At this time, in the traveling-type cultivator, since the feet of the worker holding the handle and the cultivating part are close to each other, when the worker raises the cultivating part through the handle during traveling, There is a risk that the foot of the operator and the tiller whose posture is controlled will come closer to each other, and there is a risk that the operator's foot will interfere with the tiller, but this is linked to the disconnection operation of the side clutch lever that is operated during turning. Since the tilling part can be reliably restored to the posture substantially parallel to the traveling part, the aircraft can be safely and smoothly rotated.

(F) Embodiments To explain the embodiments of the present invention in detail with reference to the drawings, FIG. 1 (A) shows a walk-behind cultivator according to the present invention, which is behind a traveling part (1) capable of self-propelling. In addition, the cultivating part (2) is swingably connected around the longitudinal axis line.

The traveling unit (1) has left and right wheels (4) and (4) mounted on the left and right sides of the lower portion of the mission case (3), and has a body frame (5) extending forward on the lower front wall of the mission case (3). ) Is attached, and the motor part (6) is mounted on the same machine frame (5).

Further, the front end of a handle support base (7) extending in a bifurcated manner to the left and right upward is attached to the upper part of the mission case (3), and the left and right handles (8) are attached to the left and right rear ends of the handle support base (7). ) (8) is attached and each handle (8) (8)
The left and right wheels (4) (4) in the mission case (3)
The left and right side clutch levers (9) and (9) for intermittently operating the left and right side clutches (not shown) respectively connected to the axles (4a) and (4a) are attached. (9a) is a side clutch interlocking wire.

In addition, a traveling unit side hitch (10) is provided on the rear wall of the mission case (3), and the tilling unit side hitch (11) provided in the tilling unit (2) can be detachably attached to the traveling unit side hitch (10). Connected to.

Further, the tillage part (2) has a swing ring (13) projecting on the front wall of the upper part of the tillage transmission case (12) with its axis oriented in the front-rear direction, while at the rear of the tiller side hitch (11). An oscillating support shaft (14) whose axis is oriented in the front-rear direction is projected on the wall, and the oscillating ring (13) is oscillatably fitted to the oscillating shaft (14).

Further, the cultivating transmission case (12) has a cultivating shaft (15) which is axially extended to the left and right lateral sides at the lower end extending downward,
A large number of plowing pawls (16) are attached to the outer peripheral surface of the plowing shaft (15).

Further, a front end of a rotary frame (17) extending rearward is attached to an upper rear wall of the tillage transmission case (12), and a tail wheel (18) is attached to a tail wheel support rod (19) at a rear end of the rotary frame (17). ) Is attached. (2 ') is a rotary cover.

The cultivating part (2) can be held horizontally by the cultivating part posture control means (50) as shown in FIG.

That is, the tilling section attitude control means (50) is the traveling section (1).
A tilt sensor (51) for detecting the left and right tilt angles around the front and rear axis, and a controller (52) for expanding and contracting a tillage part posture control cylinder (22) described later based on the detection result of the tilt sensor (51). It consists of.

The tiller posture control cylinder (22) is shown in FIG.
As shown in FIG. 3, the tip of the cylinder support arm (20) protruding laterally leftward from the front left side wall (7a) of the handle support base (7) and the left side of the outer peripheral surface of the swing ring (13). It is interposed between the tip end of the ring swing arm (21) protruding further leftward and laterally. (22a) is a first connecting pin, and (22b) is a second connecting pin.

Moreover, such a tilling part posture control cylinder (22) has an electric motor (23) that starts by detecting an inclination of the traveling part (1) around the longitudinal axis, and a drive shaft of the electric motor (23). A rotating male screw part (24) whose upper end is interlockingly connected and extended downward, and an upper female screw part (25a) are screwed to the rotating male screw part (24), and the lower end is the cylinder swing. The lifting operation pipe (25) connected to the tip of the moving arm (21) and the upper end are attached to the electric motor (23), and the turning male screw part (24)
And a rotating male screw part case (26) surrounding the periphery of the.

With this configuration, the electric motor (23) is started in response to a command from the controller (52) based on the result of the tilt angle detection of the traveling section (1) by the tilt sensor (51), and the turning male screw section (24) is positively moved. Or, by rotating in reverse, the lifting operation pipe (25) is moved up and down, and further the ring swing arm (21).
The oscillating ring (13) can be oscillated around the axis line via the to hold the cultivating part (2) in the set inclined posture.

In addition, as shown in FIG. 2, in the vicinity of the left and right side clutches (9) (9), the plowing part restoration sensors (53) (53) are provided.
The sensor (53) (53) detects the disengagement operation of each side clutch (9) (9), sends the detection result to the controller (52), and the controller (52) The tilt sensor (51) is stopped and the tilling part posture control cylinder (22) is expanded and contracted so that the tilling part (2) can be restored to a posture substantially parallel to the traveling part (1). ing.

With such a configuration, the plowing part (2) can be forcibly and automatically restored by disengaging one of the left and right side clutches (9) and (9). It is advantageous.

Further, as shown in FIGS. 1 to 4, a first gear case (27) provided on the upper right wall of the mission case (3),
A transmission mechanism (29) is provided between the cultivating transmission case (12) and a second gear case (28) provided on the upper right side wall of the cultivating transmission case (12).

The transmission mechanism (29) has a transmission shaft (31) which is axially expandable and contractible by spline-fitting a midway portion at a rear end of the output shaft (30) protruding rearward from the first gear case (27). )
Of the second gear case (28) to the rear end of the transmission shaft (31) by connecting the front end of the transmission via the front universal joint (32).
The front end of the input shaft (33) protruding further forward is connected via the rear universal joint (34).

(35) is a cylindrical transmission shaft protection cover that is configured to be expandable and contractible in the axial direction, and surrounds the outer periphery of the transmission shaft (31), and the front and rear ends thereof are respectively the first and second gear cases (27) (28). ) Is attached.

Further, the outer periphery of the transmission shaft protection cover (35) is surrounded by a tubular elastic cover (36) made of an elastic material, and the front end of the elastic cover (36) has a first gear case (2).
7) is connected to the rear end peripheral surface (27a) by the first connecting pin (37), and the rear end of the elastic cover (36) is connected to the front end peripheral surface (28a) of the second gear case (28). On the second connecting pin (38)
Are connected by.

The elastic cover (36) is pulled in conjunction with the shortening operation of the tilling part posture control cylinder (22), and the tension biasing force of the elastic cover (36) regulates the minimum shortening of the cylinder (22). I am able to do it.

The embodiment of the present invention is configured as described above, and according to this embodiment, the following operational effects are produced.

That is, when the side clutch levers (9) and (9) are operated to disengage the side clutch, the tillage part restoration sensor (53) detects the disconnection operation of the side clutch levers (9) and (9). Since the inclination sensor (51) is stopped and the tiller section attitude control means (50) can restore the tiller section (2) to a posture substantially parallel to the traveling section (1), the rotation of the machine is prevented. Occasionally, at the same time when the side clutch lever is operated for the rounding operation, the tilling section (2) is automatically restored, and the rounding operation can be smoothly and reliably performed.

[Brief description of drawings]

 FIG. 1 is a side view of a walk-behind cultivator according to the present invention. FIG. 2 is a rear sectional view of the main part. FIG. 3 is a plan view of the main part. FIG. 4 is an explanatory view of the tilling part posture control means. (A): Walk-type cultivator (1): Traveling part (2): Tilling part (3): Mission case (12): Tilling power transmission case (22): Cylinder for posture control of cultivating part (29): Transmission mechanism ( 36): Elastic cover (50): Tillage posture control means (51): Tilt sensor (53): Tillage restoration sensor

Claims (1)

[Scope of utility model registration request] 1. A cultivating part (2) is connected to a rear part of a traveling part (1) which can be self-propelled so as to be swingable around an axis line in the front-rear direction, and a pair of left and right handles (8) are arranged from the traveling part (1). ) (8)
In a walk-type cultivator which is formed by extending backward above the tiller (2), a tilt sensor (51) for detecting a left-right tilt angle of the trailer (1) at the running part (1). And the running part (1)
Between the cultivating part (2) and the cultivating part (2), one side end of the cultivating part (2) is vertically swung based on the detection result of the tilt sensor (51) to control the posture of the cultivating part (2). A side clutch control (50) is provided, and a pair of left and right handles (8) and (8) are connected to left and right wheels (4) and (4) of the traveling section (1) to intermittently operate side clutches ( 9) (9) are attached to the side clutch levers (9), (9) near the side clutch levers (9), (9) to detect the cutting operation of the tillage part restoration sensor (53) (53) Is provided, the detection of the tilt sensor (51) is stopped based on the detection result of each sensor (53) (53), and the tilling section attitude control means (50) causes the tilling section (2) to move to the traveling section (1). Walk-type tillage characterized by being restored to a substantially parallel posture .