JPS6112723Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a power transmission device for a rotary tillage device, which disperses the impact during tilling through an intermediate shaft, absorbs it by a tension mechanism that presses against the winding transmission mechanism, and further reduces the power It is an object of the present invention to reduce the amount of lateral protrusion of a transmission device so that it can be miniaturized.

As a power transmission device for rotary tillage equipment,
There are devices that use a chain or other winding transmission mechanism, but in the past, this type of device directly linked the drive sprocket of the drive shaft and the driven sprocket of the pawl shaft with a single chain, so the pawl shaft did not move when tilling. When a shock is applied to the chain case, the shock cannot be sufficiently alleviated, causing oil leakage from the chain case.

The present invention solves these conventional problems, and its feature is that in a rotary tiller equipped with a power transmission device on one side in the lateral direction, there is no problem between the drive shaft and the pawl shaft. An intermediate shaft is provided in the
Two inner and outer idler wheels that rotate integrally are fitted onto this intermediate shaft, and the drive wheel of the drive shaft and the outer idler wheel are interlocked via a winding transmission mechanism, and the inner idler The roller body and the driven wheel body of the pawl shaft are interlocked via a wrap-around transmission mechanism, and a tension mechanism is pressed into contact with the tension side of the latter wrap-around transmission mechanism.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. FIGS. 1 and 2 show a side drive type rotary tiller, in which 1 is an input gear case, and on both sides side covers 2, 3
Cylindrical support arms 4 and 5 are attached via the cylindrical support arms 4 and 5. Reference numeral 6 denotes an input shaft that is inserted and supported in the input gear case 1, and can be connected to the PTO shaft on the tractor side via a universal joint shaft.A bevel gear 7 fixed to this input shaft 6 is connected to each bevel gear 8, 9. It is interlocked. The bevel gears 8 and 9 are provided at the inner ends of a drive shaft 10 and a power take-off shaft 11, and the drive shaft 10 passes through the support arm 4 and protrudes into the chain case 12, and the power take-off shaft 11 is connected to the support arm. 5 and protrudes outward from the side frame 13. The chain case 12 includes a case plate 14 attached to the outside of the support arm 4, and a trunk-shaped case body 1 attached to the case plate 14.
5, and covers 18 and 19 that are detachably attached to upper and lower openings 16 and 17 formed on the side surface of the case body 15. The side frame 13 is provided at the outer end of the support arm 5. Reference numeral 20 denotes a claw shaft formed by installing a large number of tilling claws 21, which rotates between the lower ends of the chain case 12 and the side frame 13 via end claw shafts 22, 23, bearing cases 24, 25, etc. freely supported. Reference numeral 26 denotes a drive sprocket as a drive wheel body, which is spline-fitted to the drive shaft 10 and fixed with a nut 27. Reference numeral 28 designates a driven sprocket as a driven wheel, which is spline-fitted to the end pawl shaft 22 integral with the pawl shaft 20 and fixed by a nut 29, and has an opening 17 opposite to the driven sprocket 28. and cover 19
will be provided. Reference numeral 30 denotes an intermediate shaft disposed between the drive shaft 10 and the pawl shaft 20, and is fixedly fixed to the case plate 14 in a cantilevered manner. An idling sprocket 31 and a small diameter idling sprocket 32 are fitted on the sleeve so as to freely rotate. The free rotation sprockets 31 and 32 are configured as a double sprocket so as to rotate together, and can be attached to the intermediate shaft 30 with the inside and outside reversed, and are prevented from coming off by a retaining ring 33. And the drive sprocket 26 and the free rotation sprockets 31, 32
An opening 16 and a cover 18 are provided on the sides corresponding to the opening 16, and the reversing device for the free rotating sprockets 31, 32 can be operated through the opening 16 by removing the cover 18. 34 is a chain suspended between the drive sprocket 26 and the large diameter idling sprocket 31, and 35 is the small diameter idling sprocket 3.
1 and a driven sprocket 28, and chain tighteners 36 and 37 are pivotally mounted on the case plate 14 corresponding to the tension sides of these chains 34 and 35, respectively. Chain tighteners 36 and 37 are tension adjustment mechanisms 38 and 39
The respective adjustment mechanisms 38, 3
9 is an adjustment bolt 4 screwed onto the case body 14
0,41, and a pressing rod 42 inserted and supported therein,
43, and a coil spring 4 for pressing the pressing rods 42, 43 against the chain tighteners 36, 37.
Consists of 4,45 mag. 46 is a power take-off pulley,
It is fixedly installed on the outside of the power take-off shaft 11.

In the above configuration, when the pawl shaft 20 is driven, the power is transmitted to the input shaft 6, the bevel gears 7, 8, and the drive shaft 1.
0, drive sprocket 26, chain 34, large diameter idling sprocket 31, small diameter idling sprocket 3
2. It is transmitted to the pawl shaft 20 through the chain 35, the driven sprocket 28 and the end pawl shaft 22, which causes the pawl shaft 20 to rotate counterclockwise in FIG. 2. At this time, the driving sprocket 26 is decelerated between the large-diameter idling sprocket 31, the small-diameter idling sprocket 32, and the driven sprocket 28, respectively.
In other words, the speed is reduced by two steps. During tilling work in such a state, the tilling resistor is in contact with the tilling claw 21.
When an impact is applied to the pawl shaft 20 through the chain 35, the impact is first applied to the chain 35, and then the chain 34
These chains 34,3
5 instantaneously impinges on the chain tighteners 36 and 37 and becomes tense, thereby alleviating and absorbing the impact force. Further, in addition to being relaxed and absorbed in this manner, the impact is also dispersed to the intermediate shaft 30, drive shaft 10, etc. and applied to the chain case 12 side, thereby preventing local concentration of impact. Therefore, the impact will not spread to the entire rotary tiller.

When changing the reduction ratio, the cover 18 is removed and the change is made through the opening 16. In this case, by removing the retaining ring 33 and chains 34, 35, the free rotating sprockets 31, 32 can be integrally connected to the intermediate shaft. Since it can be removed from 30, it is then only necessary to turn it inside out and attach it again, making it very easy to change the reduction ratio. Further, by providing the intermediate shaft 30 between the drive shaft 10 and the pawl shaft 20 in this manner, the center of gravity of the entire rotary tiller can be set low.

If the driving sprocket 26 is on the outside and the driven sprocket 28 is on the inside, the chain case 12
The width at the bottom can be made smaller.

Attach the seeding machine to the rear of the rotary tiller,
When plowing and sowing are carried out at the same time,
A belt is hung around the power take-off pulley 46, and the power for driving the seeding machine is taken out from it.

In the illustrated example, the free rotating sprockets 31 and 32 are integrated, but they may be separate units. Furthermore, although a chain transmission mechanism using a sprocket and a chain is shown as a winding transmission mechanism, it is also possible to use a belt transmission mechanism using a pulley and a belt.

As described above, in the present invention, an intermediate shaft is provided between the drive shaft and the claw shaft, and the drive shaft and the claw shaft are interlocked by two sets of winding transmission mechanisms using this intermediate shaft as a relay point. When an impact force is applied to the claw shaft, it can be dispersed to the intermediate shaft, thereby preventing local concentration. In addition, two free-rolling wheels (outer and outer) are fitted around the intermediate shaft, and the inner free-rolling wheel is wrapped around the drive wheel of the drive shaft via a winding transmission mechanism. Each of the pawl shafts is linked to the driven wheels via a transmission mechanism, and the lower winding transmission mechanism is located on the inside, so the amount of lateral protrusion of the transmission device on the lower side can be reduced. It does not make it difficult to till the edge of the ridge. Furthermore, since a tension mechanism is provided that presses against the tension side of the lower winding transmission mechanism, the impact during plowing can be sufficiently alleviated and absorbed on the side closest to the pawl shaft.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional rear view showing an embodiment of the present invention;
FIG. 2 is a longitudinal sectional side view of the same. 10... Drive shaft, 12... Chain case, 2
0... Pawl shaft, 26... Drive sprocket, 28...
... Driven sprocket, 31, 32 ... Idle sprocket, 34, 35 ... Chain.

Claims (1)

[Scope of utility model registration request] In a rotary cultivating device equipped with a power transmission device at one end in the lateral direction, an intermediate shaft is provided between the drive shaft and the pawl shaft, and two free rotating wheels, an inner and a outer wheel, that rotate integrally are fitted onto the intermediate shaft. The driving wheel body of the drive shaft and the outer idler wheel body are interlocked via a wrap-around transmission mechanism, and the inner idler wheel body and the driven wheel body of the pawl shaft are interlocked via a wrap-around transmission mechanism. A power transmission device for a rotary tiller, characterized in that a tension mechanism is pressed into contact with the tension side of the latter wrapping transmission mechanism.