JPH0595216U - PTO clutch device for agricultural tractor - Google Patents

Abstract

(57) [Summary] [Purpose] The PTO shaft of an agricultural tractor can be freely turned on and off. [Structure] An agricultural tractor in which a rotary working machine (6) is connected to the rear of the machine body (1) and a rotary working machine (6) side is rotationally driven by a PTO shaft (9) provided on the machine body (1) side, A PTO clutch means (34) for turning on and off the rotation of the PTO shaft (9) is provided, and a PTO operation switch (35) for operating the PTO clutch means (34) is provided at the driver's foot (36). .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a PTO clutch device for an agricultural tractor including a rotary working machine and the like.

[0002]

[Prior Art]

 Conventionally, in an agricultural tractor equipped with a rotary working machine, a PTO shaft 71 is provided on the machine body 70 side as shown in FIG. 5, and a rotary pawl 74 on the rotary working machine 73 side is provided by the PTO shaft 71 via a joint shaft 72. There are those that rotate and drive.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional type, when performing the tilling work by the rotary working machine 73 while traveling the machine body 70 in the field, when the machine body 70 advances to the headland, the traveling speed is changed to turn the machine body 70. Although the rotary working machine 73 is raised by lowering it, the PTO shaft 71 and the rotary pawl 74 on the side of the machine body 70 are constantly rotating at this time, so when the rotary working machine 73 is raised above the field scene. In the field scene, a large concave depression 75 and a raised soil portion 76 were generated, which made it difficult to finish the headland flat.

[0004]

[Means for Solving the Problems]

 The present invention relates to an agricultural tractor in which a rotary working machine is connected to a rear part of a machine body and a rotary working machine side is rotationally driven by a PTO shaft provided on the machine body side, and PTO clutch means for turning on and off the rotation of the PTO shaft is provided. Then, a PTO clutch device for an agricultural tractor is provided, in which a PTO operation switch for operating the PTO clutch means is provided at the foot of the driver.

Further, according to the present invention, in the agricultural tractor, a PTO clutch means for turning on and off the rotation of the PTO shaft is provided, and an operation switch for operating the PTO clutch means is provided on a hand operation lever. It has characteristics.

[0006]

【Example】

 An embodiment of the present invention will be specifically described with reference to the drawings, in which 1 is a machine of an agricultural tractor A, and an engine 2 is mounted on a front portion thereof. 3 is a front wheel, and 4 is a mission case provided at the rear of the machine body, and a rear wheel 5 is provided. A rotary working machine 6 is connected to the rear of the machine body 1 through a three-point hitch 7. A rotary pawl 8 for cultivating a field scene is rotatably provided on the rotary working machine 6.

Reference numeral 9 denotes a PTO shaft provided in the mission case 4, which can freely drive the rotary working machine 6 side via a joint shaft 10.

Further, in FIG. 2, 11 is a main clutch connected to the engine 2, 12 is a main shaft, 13 is a first shaft, and a transmission gear 14 for performing low speed and reverse gear shift is provided on the first shaft 13. A shift gear 15 for shifting between middle speed and high speed is provided. Reference numeral 16 is a first auxiliary gear, and 17 is a second auxiliary gear.

Reference numeral 18 denotes a second shaft, on which a drive gear 19 and speed change gears 20, 21, 22 are mounted.

Reference numeral 23 is a third shaft, on which a back gear 24, a sub-transmission slide gear 25, and a sub-transmission gear 26 are mounted. 27 is a front wheel drive mechanism, 28 is a PTO speed change shaft, and a PTO slide gear 29, a PTO gear 30, and a PTO reduction gear 31 are mounted on the PTO shaft 28. Reference numeral 32 is a PTO reduction gear mounted on the PTO shaft 9.

The PTO shaft 9 is provided with a PTO clutch means 34 having an electromagnetic clutch 33, and an operation switch 35 for turning the PTO clutch means 34 ON / OFF is operated by the driver as shown in FIG. It is provided on the foot portion 36, that is, on the step 37.

Further, the PTO operation switch 35 may be provided on a hand operation lever 39 such as a position lever 38 for operating up and down of the working machine as shown in FIG.

Further, in FIG. 2, 40 is a differential device for driving the rear wheels 5, 41 is a brake, 42 is a differential lock mechanism, 43 is a rear axle, and 44 is a gear transmission mechanism.

In FIG. 3, reference numeral 45 is a steering wheel, 46 is a main gear shift lever, 47 is a PTO switching lever for switching the rotation of the PTO shaft 9 between an interlocking state, an independent rotation state, and a cut state, and 48 is It is a brake pedal. Reference numeral 49 denotes a rotating light that is turned on when the PTO operating means 35 is operated to turn off the PTO clutch means 34 to inform the driver. The rotating light is installed on the hood 50. 51 is a hydraulic lift arm up / down switch, 52 is a working depth dial, and 53 is a sensitivity adjustment dial.

The embodiment of the present invention is configured as described above. Therefore, when the farm scene is cultivated by the agricultural tractor, the rotary working machine 6 connected to the rear of the machine body 1 while moving the machine body 1 forward. The rotary work is performed by. In this case, the PTO shaft 9 and the rotary working machine 6 side are interlockingly connected via the joint shaft 10, and the rotation of the PTO shaft 9 causes the rotary pawl 8 to rotate.

When the vehicle body 1 reaches the headland position while plowing the field scene, the driver lowers the traveling speed of the vehicle body 1 by rotating the engine 2 at a low speed.

At the same time, the PTO operation switch 35 provided on the foot portion 36 or the PTO switch 35 provided on the hand operation lever 39 is operated to turn off the PTO clutch means 34 to stop the rotation of the PTO shaft 9. At the same time, the hand operation lever 39 for raising and lowering the hydraulic pressure is lifted upward to raise the rotary working machine 6.

Therefore, when the machine body 1 reaches the headland position, the rotation of the rotary pawl 8 stops, and at the same time, the rotary working machine 6 ascends, so that at the end of the cultivated land, there are no concave depressions or ridges of soil. There is no.

Next, the driver lowers the rotary working machine 6 while turning the machine body 1. At the same time, the driver operates the PTO operation switch 35 to turn on the PTO clutch means 34. Therefore, the cultivating work can be performed while the PTO shaft 9 rotates and the rotary claw 8 rotates.

[0020]

[Effect of the device]

 According to the present invention, in the agricultural tractor in which the rotary working machine is connected to the rear part of the machine body and the rotary working machine side is rotationally driven by the PTO shaft provided on the machine body side, the PTO clutch for turning on and off the rotation of the PTO shaft is operated. By providing a means and a PTO operation switch for operating the same PTO clutch step at the driver's foot or hand operation lever, simply by operating the PTO operation switch when the rotary working machine rises, The PTO axis automatically stops, and therefore no depressions or soil mounds are formed in the field scene, and headlands are finished uniformly.

Further, when the PTO switch is provided at the foot of the driver, the operation of the PTO switch can be easily and reliably performed while continuing the operation of the steering wheel.

Further, when the PTO switch is provided on the hand operation lever for raising and lowering the rotary working unit, the PTO switch and the rotary working unit can be raised and lowered simultaneously with one hand, which facilitates the driving operation. ..

[Brief description of drawings]

FIG. 1 is an overall side view of an agricultural tractor equipped with the present invention.

FIG. 2 is a power transmission mechanism diagram of an agricultural tractor.

FIG. 3 is a side view showing an essential part of the present invention.

FIG. 4 is a perspective view showing a main part of the present invention.

FIG. 5 is an overall side view of a conventional agricultural tractor.

[Explanation of symbols]

 1 Airframe 6 Rotary work machine 9 PTO shaft 34 PTO clutch means 35 PTO operation switch 36 Foot part 39 Hand operation lever

Claims (2)

[Scope of utility model registration request] 1. An agricultural tractor in which a rotary working machine (6) is connected to the rear of the machine body (1) and a PTO shaft (9) provided on the machine body (1) side rotationally drives the rotary work machine (6) side. In the above, a PTO clutch means (34) for turning on and off the rotation of the PTO shaft (9) is provided, and a PTO operation switch (35) for operating the PTO clutch means (34) is provided at the driver's foot (36). A PTO clutch device for an agricultural tractor characterized by being provided. 2. An agricultural tractor in which a rotary working machine (6) is connected to the rear of the machine body (1) and a PTO shaft (9) provided on the machine body (1) side rotationally drives the rotary work machine (6) side. The PTO clutch means (34) for turning on and off the rotation of the PTO shaft (9) is provided, and the operation switch (35) for operating the PTO clutch means (34) is provided on the hand operation lever (39). A PTO clutch device for an agricultural tractor.