JP3238730B2 - Work machine horizontal controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal control device for a working machine.

[0002]

2. Description of the Related Art Conventionally, there is a working machine, for example, a tractor in which a tilling device is connected to a tractor behind a tractor by a three-point link type lifting link mechanism so as to be able to move up and down.

[0003] A hydraulic cylinder for horizontal control is interposed between one of a pair of left and right lift arms provided on the tractor and a lower link corresponding to the lift arm. The tilling device can be always kept horizontal regardless of the inclination of the tractor by performing the expansion and contraction operation via the control unit provided on the tractor based on the detection result of the angle detection sensor.

[0004]

However, in the case of the above-mentioned working machine, a control unit disposed on the tractor and a cultivator for changing a working unit such as a tilling device connected to the rear of the tractor in accordance with working conditions. It is necessary to process the connection wiring with the inclination angle detection sensor attached to the apparatus. At this time, the inclination angle detection sensor is generally removed from the working unit, but the work of removing such a sensor is complicated. .

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a working machine in which a working unit is connected to the rear of a tractor by a three-point link type lifting / lowering link mechanism so as to be vertically movable and horizontally controllable. The front ends of a pair of left and right lower links forming a pair are rotatably connected to the tractor around the left-right axis and the front-rear axis, respectively, and the rear end of the lower link is turned around the left-right axis to the working unit. The present invention provides a horizontal control device for a working machine, characterized in that a tilt angle detection sensor for detecting a tilt angle of a working portion is attached to one of the lower links.

A socket is mounted on the rear end of the lower link via a holder so as to be rotatable around a vertical axis, and a connection pin insertion hole is formed in the socket so as to penetrate therethrough. It is also characterized in that the rear end of the lower link is connected to the working part by a connecting pin inserted into the work piece.

[0007]

For example, when performing tilling work, a tilling device as a working unit is connected to the rear of the tractor by a three-point link type lifting link mechanism so as to be vertically movable and horizontally controllable.
The tilling operation can be performed by pulling the tilling device while tilling the tilling device.

At this time, an inclination angle detection sensor for detecting the inclination angle of the tilling device is attached to one of a pair of left and right lower links forming a part of a lifting link mechanism, and both lower links have front ends connected to a tractor. The tilling device is pivotally connected around the left-right axis and around the front-rear axis, and the rear end is pivotally connected to the working part around the left-right axis. When the tilling device is tilted by swinging about the axis of the tilling device, the pair of left and right lower links is also integrally tilted. The tilling work can be performed efficiently by keeping the tilling depth constant by constantly controlling the horizons and maintaining a constant tilling depth.

In addition, since the inclination angle detection sensor is attached to the lower link, the work of replacing the tilling device can be performed with the sensor attached to the lower link.
It is not necessary to process the connection wiring between the sensor and the control unit disposed on the tractor.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows a working machine equipped with a horizontal control device B according to the present invention. The working machine A is a three-point link type tilling device 2 which is a working unit behind a tractor 1 as a working unit. The link mechanism 3 is connected so as to be vertically movable and horizontally controllable.

As shown in FIG. 1, the tractor 1 is provided with a motor unit 5 at a front portion of a body frame 4, a transmission case 6 at a rear portion thereof, and an operation unit 7 therebetween. The front wheels 8, 8 are mounted on the lower left and right sides of the front part, and the rear wheels 9, 9 are mounted on the left and right sides of the transmission case 6. A hydraulic case 10 is provided on the transmission case 6, and the left and right sides of the hydraulic case 10 are provided. A pair of lift arms 11,1
1 protrudes rearward. 12 is a hydraulic cylinder for driving the lift arm, 13 is a handle, 14 is a seat, and 15 is a fender.

Immediately after the seat 14, between the left and right fenders 15, 15, the control unit C constituting a part of the horizontal control device B according to the present invention and the tilt of the tractor 1 for detecting the tilt angle of the tractor 1 are provided. An angle sensor 77 is provided.

As shown in FIGS. 1 and 2, the tillage device 2 has a shaft case 18 provided between an upper portion of a left tillage support plate 16 and an upper portion of a right tillage transmission case 17 and a tillage claw 19 provided between lower portions.
And a power take-off shaft 22 projecting rearward from the transmission case 6 of the tractor 1 by providing a gear case 21 at the center of the shaft case 18. Are linked via a transmission shaft 23, 24 is a rotary cover, 25 is a rotary frame, 26
Is the tail wheel support, 27 is the tail wheel, 28 is the mast for connecting the top link, 29 is the tail wheel elevating adjustment cylinder, 30 is the rear cover, 31 is the hanger rod, 32 is the bracket for connecting the lower link,
33 is a reinforcing bracket and 34 is a cylinder stay.

The lifting link mechanism 3 includes a transmission case 6
Top link connecting bracket 35 protruding from the upper part of the rear wall
And the mast 28 provided on the tillage device 2 are connected by a top link 36, and the lower left and right side walls of the transmission case 6 and the brackets 32, 32 provided on the tillage device 2 are connected by a pair of left and right lower links 37, 37. The tip of the left lift arm 11 and the middle of the left lower link 37 are linked and connected by a lift link 38, and the tip of the right lift arm 11 and the middle of the right lower link 37 are connected to a hydraulic cylinder for horizontal control ( (Not shown).

As shown in FIGS. 2 and 3, the lower link 37 has an intermediate portion with an inclined upper end located inward and a lower end located outward, and a ball receiving portion 42 at the front end. Direction, left and right direction, and up and down direction so as to be rotatable around each axis, a connection pin insertion hole 43 is formed in the ball receiving portion 42 in a transversely penetrating shape, and a lower link connection pin 44 is inserted into the insertion hole 43. The front end of the lower link 37 is swingably connected to the lower portion of the side wall of the transmission case 6 by the connecting pin 44, and the receiving portion 45 is attached to the rear end. Is formed in a transversely penetrating shape, the lower link connecting pin 47 is inserted into the insertion hole 46, and the rear end of the lower link 37 is connected to the bracket 32 provided on the tillage device by the connecting pin 47. It is rotatably connected only around. 40 and 41 are connection brackets of the lift link.

In this manner, when the tilling device 2 is rolled and tilted around the longitudinal axis, the pair of left and right lower links 37 are also tilted integrally.

An inclination angle detection sensor 48 is attached to one of the lower links 37, 37 so that the inclination angle of the tilling device 2 can be detected by the sensor 48.
As shown in FIG. 4, a sensor casing 49 is detachably attached to the front inner side surface of the lower link 37 on the left side with bolts 50, and the inclination angle detection sensor 48 is accommodated in the sensor casing 49. Reference numeral 51 denotes a harness cable for connecting the inclination angle detection sensor 48 and the control unit C.

As described above, since the inclination angle detection sensor 48 is attached to the lower link 37, the work of replacing the tilling apparatus 2 can be performed with the sensor 48 attached to the lower link 37. It is not necessary to perform processing of connection wiring between the control unit C disposed on the tractor 1 and the control unit C.

The horizontal control device B according to the present invention comprises the control section C, a hydraulic cylinder for horizontal control, and a tilt angle detection sensor.
48 and a tilt angle sensor 77 of this machine.
The inclination angle detection sensor 44 and the main unit inclination angle sensor 77 are connected to the input side of the controller, the hydraulic cylinder for horizontal control is connected to the output side of the control unit C, and the rolling inclination angle of the tillage device 2 is detected by the inclination angle detection sensor 77. , The rolling inclination angle of the tractor 1 is detected by the inclination angle sensor 52 of the machine, and both detection results are input to the control unit C, and the hydraulic pressure for horizontal control is input from the control unit C based on both detection results. By outputting a signal to the cylinder and causing the hydraulic cylinder to expand and contract, the tilling apparatus 2 can always be held horizontally.

FIG. 5 shows a mounting structure as another embodiment of the inclination angle detecting sensor 48. The sensor 48 is provided with a sensor mounting bracket 52 having a substantially inverted L-shaped cross section on the front inner side surface of the lower link 37. The bracket 52 is detachably attached to the lower end of the rising portion 52a to the lower link 37 by a bolt 53, and horizontally extends inward from the upper end of the rising portion 52a to form a horizontal extension portion 52b. And horizontal sensor
48 is mounted in a hanging state by mounting bolts 54. 75 is a buffer member.

FIGS. 6 and 7 show the structure of a lower link 37 as another embodiment. The lower link 37 has a ball socket 55 attached to a front end via a holder 56 and a socket attached to a rear end. 57 is mounted via a holder 58.

The ball socket 55 is
The inside is rotatable around the axis in any of the front, rear, left and right, and up and down directions.
The inside is rotatable only about the vertical axis. Five
9 and 60 are connection pin insertion holes formed through the sockets 55 and 57, 57a is a socket rotation support shaft, 61 is a link connection hole, 50a
Is a sensor mounting bolt hole.

FIGS. 8 and 9 show a lower link 37 as another embodiment of the present invention, in which a socket 63 is rotatably pivoted about a vertical axis by a vertically split holder 62 at the rear end. 63a is the upper socket rotation support shaft,
64 is a lower socket rotation support shaft, and 65 is a connecting pin insertion hole. 62a is a shaft insertion hole.

FIGS. 10 and 11 show the structure of a lower link 37 as still another embodiment, in which a substantially cylindrical bulging portion 37a is formed at the rear end of the lower link 37, and the bulging portion 37a is formed. A connecting pin insertion hole 66 is formed through the center of the protruding portion 37a, and the insertion hole 66 is formed so that the front and rear diameter D2 of the left and right opening edges is slightly larger than the front and rear diameter D1 of the center, The rear end of the lower link 37 can be swingably connected to the lower link connecting pin 47 inserted through the insertion hole 66 around the vertical axis. 76 is a retaining pin.

FIG. 13 shows a mounting structure as another embodiment of the inclination angle detecting sensor 48, and the transmission case 6
A pivot 67 is projected from the rear wall, a sensor mounting boss 68 is rotatably mounted on the pivot 67, and an inclination angle detection sensor 48 is mounted on the boss 68, while a connection bracket 69 is attached to the tillage device 2.
The bracket 69 and the sensor mounting boss 68 are connected to each other via universal joints 72 and 73 by a telescopically interlocking rod 71.

Thus, when the tilling device 2 is inclined, the connecting bracket 69 → the universal joint 73 →
The sensor mounting boss portion 68 rotates along the interlocking rod 71 → the universal joint 72, and the tilt angle detection sensor 48 mounted on the boss portion 68 tilts to detect the tilt angle of the tillage device 2. .

[0028]

According to the present invention, the following effects can be obtained.

That is, since the inclination angle detection sensor for detecting the inclination angle of the working unit is attached to one of the lower links connected so as to be inclined integrally with the working unit, the sensor can be easily replaced when the working unit is replaced. It is not necessary to perform a process of connecting and wiring the control unit disposed on the tractor to the sensor, and the efficiency of the work unit replacement work can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a working machine including a horizontal control device according to the present invention.

FIG. 2 is a side view of the main part.

FIG. 3 is a sectional view taken along line II of FIG. 2;

FIG. 4 is a perspective view showing a mounting structure of a tilt angle detection sensor.

FIG. 5 is a cross-sectional rear view of a mounting structure as another embodiment of the tilt angle detection sensor.

FIG. 6 is a plan view of a lower link as another embodiment.

FIG. 7 is a side view of the same.

FIG. 8 is a partially cutaway side view of a rear end portion of a lower link as another embodiment.

FIG. 9 is an explanatory view of the disassembly.

FIG. 10 is a partially cutaway plan view of the rear end of a lower link as still another embodiment.

FIG. 11 is a side view of the same.

FIG. 12 is a partially cutaway side view showing a mounting structure as another embodiment of the inclination angle detection sensor.

[Explanation of symbols]

 A Work machine 1 Tractor 2 Tilling device 3 Elevating link mechanism 37 Lower link 47 Connecting pin 48 Incline angle detection sensor 55 Socket 56 Holder 60 Connecting pin insertion hole

──────────────────────────────────────────────────続 き Continuing from the front page (72) Eiki Kamiyama 1-32 Chaya-cho, Kita-ku, Osaka City, Osaka Prefecture Inside Yanmar Diesel Co., Ltd. (72) Inventor Shuichi Togami 428 Enami, Okayama-shi, Okayama Pref. Incorporated (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01B 63/10 A01B 59/043

Claims (2)

(57) [Claims] 1. A working machine in which a working unit is connected to a rear of a tractor 1 by a three-point link type elevating link mechanism 3 so as to be vertically movable and horizontally controllable. The front ends of the lower links 37, 37 are connected to the tractor 1 so as to be rotatable around the left-right axis and the front-rear axis, respectively. Rotatably connected to one of the lower links 37
A horizontal control device for a working machine, wherein a tilt angle detection sensor 48 for detecting a tilt angle of a working unit is attached to the work unit. 2. A socket 55 is attached to the rear end of the lower link 37 via a holder 56 so as to be rotatable around a vertical axis, and a connecting pin insertion hole 60 is formed in the socket 55 in a transversely penetrating state. The horizontal control device for a working machine according to claim 1, wherein the rear end of the lower link (37) is connected to the working part by a connecting pin (47) inserted into the connecting pin insertion hole (60).