JPH0568202U - Top link length adjustment structure for agricultural tractors - Google Patents

Abstract

(57) [Summary] [Purpose] The length of the top link in agricultural tractors was made adjustable. [Structure] The working machine (9) is connected to the rear part of the machine body via the three-point link mechanism (9A), and one lift link (10B) is connected by the horizontal sensor (19) and the control device (20) provided on the machine body. In an agricultural tractor that horizontally controls the working machine (9) side while allowing it to expand and contract, the top link (1) of the above-mentioned three-point link mechanism (9A)
The structure (4) is configured to be expandable and contractible via the expansion and contraction mechanism (14A), and the expansion and contraction mechanism (14A) and the control device (20) are selectively connectable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a top link mounted on a three-point link mechanism of an agricultural tractor.

[0002]

[Prior Art]

 Conventionally, a work machine is linked to the rear part of the machine body of an agricultural tractor via a three-point link mechanism so that it can be vertically moved up and down.When the work machine is a rotary work machine, a horizontal sensor installed on the machine body and There is one that always holds the rotary working machine horizontally while allowing one lift link to extend and contract via a control device.

[0003]

[Problems to be solved by the device]

 However, in the above embodiment, the working machine connected to the rear of the machine body cannot be tilted in the front-rear direction, and therefore, when the machine body of the agricultural tractor is in the forward ascending state or, conversely, the forward descending state. There was a problem that the posture of the working machine was not controlled at all and the tillage depth could not be kept constant.

[0004]

[Means for Solving the Problems]

 The present invention relates to an agricultural tractor in which a working machine is connected to the rear of the machine body through a three-point link mechanism, and one of the lift links is made extendable by a horizontal sensor and a control device provided on the machine body while horizontally controlling the work machine side. The top link of the three-point link mechanism is configured to be extendable / contractible via an extension / contraction mechanism, and the extension / contraction mechanism and the control device are selectively connectable to each other. It is intended to provide a plink length adjusting structure.

[0005]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. 1 is an agricultural tractor body, and rear wheels 3, 3 are connected to the left and right sides of a mission case 2. Reference numeral 4 is a rear axle housing, 5 is a hydraulic case, and a lifting hydraulic cylinder device 6 is provided therein.

7A and 7B are lift arms that are driven by the hydraulic cylinder device 6, and 8A and 8B are lower links, the front part of which is pivotally attached to the mission case 2 and the rear part of which is a three-point link mechanism. The rotary working machine 9-1 which is the working machine 9 is connected via 9A. 10A and 10B are lift links that interlock the left and right lift arms 7A and 7B and the left and right lower links 8A and 8B. The right lift link 10B is provided with an extendable hydraulic cylinder 11.

Reference numeral 12 is a gear box provided on the rotary work machine 9-1, and 13 is an upper frame provided on the upper part of the gear box 12, which is configured to be extendable between the rear wall of the mission case 2 and the upper frame 13. A top link 14 is provided. Reference numeral 15 is an electric actuator provided in the top link 14 and constitutes an expansion / contraction mechanism 14A. 16 is a telescopic rod, 17 is a drive shaft, and 18 is a tilling claw.

The lift links 10A, 10B, the lower links 8A, 8B, and the top link 14 constitute a three-point link mechanism 9A.

Further, in FIG. 2, reference numeral 19 denotes a horizontal sensor provided on the machine body 1 and connected to the control device 20. Reference numeral 21 is an electromagnetic valve connected to the control device 20, and the output of the control device 20 allows the right lift link 10B to extend and contract.

Reference numeral 22 denotes a harness connected to the control device 20 side, and a connecting coupler 23 is provided at a rear end of the harness. A harness 24 is connected to the electromagnetic valve 21 side and has a connecting coupler 25 at the front end. Further, reference numeral 26 is a top link mounting metal for pivotally supporting the front end of the top link 14, and mounting holes 27 are provided in upper and lower three stages.

Reference numeral 28 denotes a harness that is connected to the electric actuator 15 side that is the expansion / contraction mechanism 14 A, and has a connecting coupler 29 at the front end.

The connection coupler 23 on the control device 20 side is configured to be selectively connectable to the connection coupler 25 on the electromagnetic valve 21 side or the connection coupler 25 on the electric actuator 15 side. There is.

Reference numeral 30 is a hydraulic hose connecting the electromagnetic valve 21 and the upper side of the hydraulic cylinder 11, 31 is a hydraulic hose connecting the electromagnetic valve 21 and the lower side of the hydraulic cylinder 11, and 32 is a telescopic rod.

Reference numeral 33 is an elevating operation lever provided in the control device 20, 34 is a sensitivity adjusting dial, and 35 is a switching dial.

Further, FIG. 3 shows a state in which a plow is connected to the rear part of the body of the agricultural tractor, and 40 in the figure indicates the top link 14 and the lower link of the three-point link mechanism 9A provided at the rear part of the body 1. The plow body is connected by 8A and 8B, and the plow 41 for plowing the soil surface is provided at the bottom.

The embodiment of the present invention is configured as described above, and when the rotary working machine 9-1 is connected to the rear part of the machine body 1 of the agricultural tractor, the connecting coupler 23 of the controller 20 and the electromagnetic field are connected. The connecting coupler 25 on the valve 21 side is connected. Therefore, when the machine body 1 tilts in the left-right direction during the rotary work, the horizontal sensor 19 detects this and outputs the detection result to the control device 20. Next, an electric signal is output from the control device 20 to the electromagnetic valve 21, and hydraulic oil is supplied by the electromagnetic valve 21 to the hydraulic cylinder 11 side provided on the right lift link 10B to expand and contract the hydraulic cylinder 11.

As a result, the right lift link 10B is adjusted to hold the entire rotary working machine 9-1 in a horizontal state.

Next, when the plow body 40 is connected to the rear part of the machine body 1, the connection coupler 23 of the control device 20 and the connection coupler 29 of the electric actuator 15 side of the top link 14 are connected.

When the plow body 40 is used to cultivate a field scene, the horizontal sensor 19 detects the front-rear inclination of the machine body 1 while setting the horizontal sensor 19 in a state of being rotated by 90 °. .. When the machine body 1 is tilted forward, the top link 14 is shortened while the electric actuator 15 is contracted by the function of the horizontal sensor 19. Then, the plow body 40 adjusts the working depth.

When the machine body 1 inclines in the forward downward direction, the electric actuator 15 is extended to extend the top link 14 contrary to the above. As a result, the working depth of the plow body 40 can be adjusted.

As described above, according to the above-described embodiment, the working machine 9 is connected to the rear part of the machine body 1 via the three-point link 9A, and the horizontal sensor 19 and the control device 20 provided on the machine body 1 are used. In an agricultural tractor that horizontally controls the work machine 9 while operating the electromagnetic valve 21 to make one lift link 10B extendable and retractable, the top link 14 is provided with an extension mechanism 14A composed of an electric actuator 15, and Since the extension mechanism 14A and the control device 20 are configured to be selectively connectable and the length of the top link 14 is made extendable, the horizontal sensor 19 that is the horizontal control means on the rotary working machine side and the The top link 14 can be extended and contracted by using the control device 20. Therefore, when connecting various working machines to the rear part of the machine body 1, the top link 14 can be freely adjusted to allow various kinds of working machines. Easy It can be attached to.

Further, since the top link 14 can be expanded and contracted, the working depth on the working machine side can always be kept constant. In addition, the automatic front-rear positioning of attachments etc. is possible to improve work efficiency. And, while the structure is simple as a whole, the working machine side can be held in the best posture.

Further, in the above agricultural tractor, the top link 14 may be composed of a hydraulic cylinder, and the hydraulic cylinder and the electromagnetic valve 21 may be connected via hydraulic hoses 30 and 31. The link 14 can be expanded and contracted with hydraulic oil.

FIG. 4 shows another embodiment relating to the rotary cover. In the figure, 50 is a rotary cover that covers the upper part of the rotary tillage claw 51, and a rubber drip is provided on the front part of the rotary cover 50. 52 is rotatably provided via a horizontal axis 52-1.

Reference numeral 53 is a support metal fitting fixed to the front side of the rotary cover 50, 54 is a rod mounting metal fitting fixed to the upper portion of the rubber droop 52 side, and the base of the adjusting rod 55 is pivotally mounted to the rod mounting metal 54. ..

A hook-shaped hooking portion 56 is provided at the rear end of the adjusting rod 55, and the hooking portion 56 can be selectively fitted into the adjusting holes 57, 58, 59 provided in the support fitting 53. I am trying. 60 is a cotter pin.

When the rotary tillage claw 51 is rotated in the forward rotation direction (arrow direction), the hook portion 56 of the adjusting rod 55 is fitted in the adjustment hole 57 at the front end.

When the rotary tillage claw 51 is rotated in the reverse rotation direction (arrow B direction), the hook portion 56 of the adjusting rod 55 is fitted into the rear adjustment hole 59 so that the rubber droop 52 is removed. Pull up and hold.

According to the above-described embodiment, the rubber droop 52 provided on the rotary cover 50 can be adjusted up and down with respect to the ground surface depending on the cultivating work condition. Therefore, especially when performing the work by reversing the rotary cultivating claw 51. Since the rubber droop 52 is raised and held upward, the soil surface and the rubber droop 52 do not come into contact with each other, and therefore the rubber droop 52 can be prevented from being damaged.

Further, since the rubber droop 52 can be provided long on the front side of the rotary cover 50, the mud does not scatter to the driver side even during the scraping work, and the work can be performed efficiently.

[0031]

[Effect of the device]

 According to the present invention, a working machine is connected to the rear part of the machine body via a three-point link mechanism, and one lift link of the three-point link mechanism is freely retractable via a horizontal sensor provided on the machine body and a control device. However, in the agricultural tractor that horizontally controls the working machine side, the top link of the three-point link mechanism is configured to be extendable and retractable through the extension mechanism, and the extension mechanism of the top link is activated by the horizontal sensor and control device. Therefore, the top link can be expanded and contracted by using the horizontal sensor and the control device that is the horizontal control means such as the rotary working machine, so that the three-point link mechanism at the rear of the machine body can be used for various working machines. When connecting, the connecting work is easy.

Moreover, since the top link can be automatically expanded and contracted, the front and rear postures of the attachment and the like are optimized, and the work efficiency is improved.

Further, when the rotary working machine is mounted on the rear part of the machine body and the rotary working machine is lifted, if the top link is contracted, the rotary working machine comes close to the machine body side, and the rotary working machine is rotated. The centrifugal force at the time becomes small and the influence on the steering wheel operation is small.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a working machine is connected to an agricultural tractor.

FIG. 2 is an explanatory diagram showing an outline of the present invention.

FIG. 3 is a side view showing a state where the plow is attached to the agricultural tractor.

FIG. 4 is a side view showing a state where a rubber drip is provided on the front side of the rotary cover.

[Explanation of symbols]

 9 Working machine 9A Three-point link mechanism 10A Lift link 10B Lift link 14 Top link 14A Telescopic mechanism 15 Electric actuator 19 Horizontal sensor 20 Control device

Claims (1)

[Scope of utility model registration request] 1. A horizontal sensor (19) provided on the machine body, which is connected to a working machine (9) at the rear of the machine body via a three-point link mechanism (9A).
Also, in the agricultural tractor that horizontally controls the working machine (9) side while making one lift link (10B) expandable and contractible by the control device (20), the top link (14) of the three-point link mechanism (9A) is expanded and contracted. The top link length adjustment in an agricultural tractor characterized in that it is configured to be extendable and retractable via the mechanism (14A) and that the extendable mechanism (14A) and the control device (20) are selectively connectable. Construction.