JPH0238562Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a transmission device for agricultural machinery, for example, which inputs the output from the PTO shaft of a tractor such as a rotary tiller to drive a working mechanism such as a rotary. .

[Technical background of the invention and its problems]

Conventionally, this type of agricultural machine is generally equipped with a transmission device having an input shaft. In this case, the input shaft has a structure in which it is rotatably supported in order to input input with its attachment position fixed to the mission device. Therefore, when connecting the PTO shaft of a tractor to the input shaft through a power transmission shaft from the outer cylinder and inner cylinder, which are fitted in a fixed axial direction and slidable only in the axial direction, the input shaft has no directionality. Therefore, it takes a lot of effort and difficulty to connect the power transmission shaft in a relatively narrow place, and the power transmission shafts currently in use generate noise when the angle exceeds approximately 30 degrees, making it difficult to smoothly transmit power. In some cases, the rotation of the PTO shaft must be stopped each time.

Furthermore, due to weight balance, there is a tendency to connect agricultural machinery close to the tractor side, so in this case, the distance between the respective PTO shafts and input shafts will inevitably become closer and smaller, and the mutual There are problems in that the angle of the power transmission shaft connecting the two becomes large, causing vibration and noise, and the length of the slud becomes short.

[Purpose of invention]

This idea was created with these points in mind.
The output part of the power transmission shaft connected to the PTO shaft of the tractor is provided on the transmission, and this output part can be freely varied in any direction.This makes it easy to connect the power transmission shaft to the PTO shaft, and also The output part of the power transmission shaft is moved backward by the length of the conventional input shaft, which reduces the amount of effort required and increases the slide length, which prevents vibration and noise and stops the rotation of the PTO shaft. The purpose of this is to enable smooth power transmission without any interference.

[Summary of the idea]

The transmission device for agricultural machinery of the present invention has a transmission case with one side closed by a bellows body attached to the main body frame of the agricultural machinery, a universal joint built into the transmission case, and one side of the universal joint. The side yoke is rotatably supported on the bellows body, and an input shaft that constitutes a telescoping power transmission shaft that transmits power from the tractor's power output shaft is connected to the tip of this yoke, and it can be moved up and down. The output shaft for driving the working mechanism of the agricultural machine is interlocked with the yoke on the other side of the universal joint.

[Example of idea]

Hereinafter, an embodiment of the present invention will be described as shown in the accompanying drawings.

In the figure, 1 is an agricultural machine, and this agricultural machine 1
A transmission device 3 is attached to the center of the main body frame 2, and a chain case 4 and brackets (not shown) are integrally attached to both ends thereof. A rotary work body 5 serving as a working mechanism is rotatably supported at both ends of a tilling shaft 6 between the chain case 4 and the lower end of the bracket. Further, a tilling section cover 7 that covers the rotary work body 5 is disposed on the upper part of the rotary work body 5, and a leveling plate 8 is rotatably attached to the rear end of this tilling section cover 7. is supported by a support mechanism 9. Further, in the front part of the main body frame 2, there is a connecting part 1 that connects to each connecting part of the three-point suspension mechanism of the tractor.
A connecting frame 11 with 0 is protruded.

Next, in the mission device 3, a bellows body 13 is arranged on the front side of the mission case 12, and this peripheral edge 14 is connected to the opening edge 15 of the mission case 12 via a washer 16 to a plurality of bolts 17. It is twisted and fastened. A bearing fitting 20 is fixed to an opening edge 19 of a mounting hole 18 formed in the center of the bellows body 13 with a plurality of bolts 22 via a washer 21, and a boss portion 2 of the inner diameter of the bearing fitting 20
An outer cylinder 25 of a sealed ball bearing 24 is integrally fixed to 3.

Further, a wide-angle universal joint 26 is built into the transmission case 12. This universal joint 26 is
Cross bins 28 are installed on both sides of the intermediate yoke 27.
The yokes 29 on both sides are connected to each other so as to be freely rotatable in the vertical and horizontal directions, i.e., to be freely bendable, and ball-shaped portions 30 are integrally protruded from the inner ends of the yokes 29 on both sides, facing each other. The ball-shaped portions 30 on both sides are rotatably engaged in an engaging hole 32 of a hollow shaft 31 in a fluid-tight manner. Further, among the yokes 29 on both sides, one yoke 29 is integrally fixed in the inner cylinder 33 via a large number of balls in the ball bearing 24 of the bellows body 13,
A deformable locking recess 35 is formed at the outer end of one yoke 29 and has a locking portion 34 that prevents rotation with the front side open. Further, the other yoke 29 is spline-fitted to a spline shaft 36 as an interlocking shaft, and the outer part of the other yoke 29 and the spline shaft 36 are connected to the transmission case 1.
It is rotatably suspended horizontally within a support tube 38 of the rear side wall 37 of No. 2 via a ball bearing 39. Further, an annular body 40 is integrally provided on the outer periphery of the hollow shaft 31, and the outer periphery of the annular body 40 is a liquid-tight annular recess formed with a large diameter and continuous with the inner wall 41 of the intermediate yoke 27. is slidably inserted into 42,
An oil ring 43 and a washer 44 are attached to opposing inner walls of the annular recess 42, and the outer peripheral portion of the annular body 40 is slidably fitted in a liquid-tight manner between the opposing washers 44. Further, a communication groove 45 is formed on one side of the annular body 40 of the hollow shaft 31 and communicates with the engagement hole 32 of the hollow shaft 31 and the annular recess 42, and the communication groove 45 communicates with the annular recess 42 and the cross pins 28 on both sides. A grease nipple 46 is attached to the rotating portion.

Next, the rear wall 3 of the mission case 12
The outer end of the spline shaft 36 attached to the rear wall 37 projects rearward from the rear wall 37, and an interlocking gear 48 is removably spline-fitted to this projecting end 47. Further, a relay shaft 50 is rotatably supported between the opening edge 15 of the front surface of the mission case 12 and the rear wall 37 via a bearing 49, and one end of the relay shaft 50 is attached to the rear wall 37. 37, a speed change relay gear 52 that meshes with the interlocking gear 48 is removably spline-fitted to this projecting end 51, and a bevel gear 53 is fixed to one side of the relay portion 50. ing. Furthermore, the main body frame 2 is provided in the mission case 12.
The inner end of an output shaft 55 provided inside protrudes, and a bevel gear 56 meshed with the bevel gear 53 is fixed to the protruding end of the output shaft 55.
5 is interlocked and connected to the rotary work body 5 via an interlocking medium. Further, the base end of the input shaft 59 of the power transmission shaft is fitted into the locking recess 35 of one yoke 29 of the universal joint 26 through a locking portion 58 formed therein to prevent rotation. As is well known, this power transmission shaft has the input shaft 59 as an inner cylinder, and an outer cylinder having a universal joint that is fitted into the input shaft 59 in a fixed manner in the axial direction and slidable in the axial direction. The base end of this outer cylinder is connected to the tractor's power take-off shaft (hereinafter referred to as
It is designed to be connected to the PTO shaft (called the PTO axis).

Further, the rear end wall 37 of the mission case 12
A cover body 61 covering the interlocking gear 48 and relay gear 52 is removably attached with bolts 62, and auxiliary gears 64, 65 for speed change are attached to a support shaft 63 protruding inside the cover body 61. This auxiliary gear 64 is removably spline-fitted and
65 can be attached to the protruding end 47 of the spline shaft 36 and the protruding end 51 of the relay shaft wheel 50 in place of the interlocking gear 48 and the speed change relay gear 52.

Next, the operation of the above structure will be explained.

Each connection part 10 of a connection frame 11 corresponding to each connection part of a three-point suspension mechanism of a tractor is connected to each connection part. In addition, the base end of the outer cylinder of the power transmission shaft is connected to the PTO shaft of the tractor, and the input shaft 59 of the transmission device 3 is slidably inserted into this outer cylinder. If the tip of the outer cylinder connected to the shaft and the tip of the input shaft 59 of the transmission device 3 do not match, rotate the input shaft 59 vertically or horizontally to connect this tip to the tip of the outer cylinder. By adjusting the input shaft 59 and the outer cylinder, the input shaft 59 and the outer cylinder can be easily slidably inserted and connected. That is, the input shaft 59 is connected to the transmission case 1.
This is because the input shaft 59 can freely rotate in any direction since its base end is connected to the wide-angle universal joint 26 built into the input shaft 59. For example, as shown in FIG.
9 is bent downward, one of the yokes 29 connected to the cross pin 2 is connected to the intermediate yoke 27.
8 and the intermediate yoke 27
is the cross pin 2 of the other yoke 29
It rotates around 8 as a fulcrum. Also, along with this,
The ball-shaped portion 30 protruding from the inner end of one yoke 29 slides and rotates within one end of the engagement hole 32 of the hollow shaft 31 while pushing the hollow shaft 31 . Inside the other end is the other yoke 2
It is displaced and rotated while sliding on the ball-shaped part 30 protruding from the inner end of the shaft 9. The annular body 40 in the moving direction of the hollow shaft 31 has oil rings 43 on both sides.
It is inserted deeply into the annular recess 42 according to the amount of movement while being guided by the annular recess 42 . In this case, abrasion damage to the cross pin 28 and the annular body 40 can be prevented by lubricating the inside of the annular recess 42 of the annular body 40 and the rotating part of the cross pin 28 from respective grease nipples 46 .

Next, the work equipment is towed by the tractor, and the input shaft 59 is moved by the PTO shaft of the tractor.
be linked. The rotation of the input shaft 59 causes the output shaft 55 to be driven in conjunction with the universal joint 26, the spline shaft 36, the interlocking gear 48, the relay gear 52, the relay shaft 50, and the bevel gears 53, 56. The rotary work body 5 is interlocked and driven by the shaft 55 via an interlocking medium. Therefore, as the working machine moves forward, the rotary work body 5 rotates to till and crush the soil in the field, and this tilled soil is leveled by the leveling plate 8.

Next, when the work equipment is suspended using the tractor's three-point suspension mechanism when turning, etc., the tractor's
The PTO shaft and the power transmission shaft connected to the PTO shaft are similarly lifted. In this case, since the input shaft 59 is designed to rotate significantly, it is bent in conjunction with the bending of the power transmission shaft of the PTO shaft. Therefore, the work machine can be rotated without stopping the rotation of the PTO shaft when the work machine is turning.

[Effect of idea]

According to the present invention, a universal joint is built into the mission case, and the yoke on one side of the universal joint is rotatably supported by a bellows body that closes one side of the mission case. The input shaft constituting the power transmission shaft is connected to the tip of the yoke on one side, making it freely rotatable in the vertical and horizontal directions, so the universal joint of the power transmission shaft is built into the transmission case, allowing the tractor to Even when agricultural machinery is connected close together, the output part of the power transmission shaft is located inside the transmission case and is moved rearward by the length of the conventional input shaft, thereby reducing the cost of the power transmission shaft. At the same time, the slidable connecting portion of this can be made large, so that vibration and noise generation of the power transmission shaft can be reliably prevented, and power from the power take-off shaft can be smoothly transmitted to the mission device. It is possible to connect the tractor and the working machine in a manner that satisfactorily corresponds to the distance between the tractor and the working machine, and it is also possible to sufficiently cope with the lifting and lowering movements of the working machine. Further, since the input shaft can be freely moved in any direction, the outer cylinder of the power transmission shaft can be easily connected.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side view of an agricultural machine, Fig. 2 is a cross-sectional plan view of the same transmission device, and Fig. 3 is an enlarged plan view of a part of the same.
FIG. 4 is a plan view showing the operating state of the same as above. 1...Agricultural machine, 2...Body frame, 12...
...Mission case, 13...Accordion body, 26...
Universal joint, 27... intermediate yoke,
28...Cross pin, 29...Yoke, 30...
Ball-shaped part, 31... hollow shaft, 55... output shaft,
59...Input shaft.

Claims (1)

[Scope of utility model registration request] A transmission case with one side closed with a bellows body is attached to the main frame of the agricultural machine, and a universal joint is built into this transmission case.
The yoke on one side of this universal joint is rotatably supported by the bellows body, and an input shaft that constitutes a telescoping power transmission shaft that transmits power from the power output shaft of the tractor is connected to the tip of this yoke. A transmission device for an agricultural working machine, characterized in that it is rotatable in vertical and horizontal directions, and an output shaft for driving a working mechanism of the agricultural working machine is interlocked and connected to the yoke on the other side of the universal joint.