JPH0123234Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to cutter drive devices for various mowers such as mid-mount mowers, and is designed to prevent damage to the sealing member provided at the lower end of the transmission case that has the input shaft due to grass, dirt, etc. In order to achieve this purpose, the mower deck is provided with an input shaft that is rotatable and opens downward. A transmission case is provided, and the transmission case is provided with a cutter shaft that is interlocked with the input shaft and has a cutter at its lower end, rotatable around the vertical axis through the opening, and the inner peripheral surface of the lower end of the transmission case and the outer peripheral surface of the cutter shaft. A sealing member is interposed in between, and an upper opening is formed on the lower side of the transmission case in the cutter shaft, consisting of a bottom wall portion facing the lower end surface of the transmission case, and a peripheral wall portion that transmits power to another cutter shaft via a belt or the like. In a mower equipped with a sheet metal pulley formed in a bowl shape, a lower end of the transmission case is inserted downward from an upper opening of the pulley,
A downwardly opening annular groove is provided on the lower end surface of the transmission case concentrically with the cutter shaft, and on the upper surface of the bottom wall facing the annular groove, an annular groove is provided in the annular groove upwardly from the lower end opening over the entire length in the circumferential direction. It is characterized in that an annular wall made of insert-shaped pipe material is welded.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 1, 1 is a tractor body, 2 is a front wheel, and 3 is a rear wheel. 4 is a mid-mounted mower, which includes a mower deck 5 and a mower deck 5.
a plurality of cutters 8 attached to the drive side and driven side cutter shafts 6 and 7, and the mower deck 5.
It is equipped with gauge wheels 9 and the like for regulating the cutting height disposed at the front and rear of the tractor, and is mounted on the lower abdomen of the tractor body 1 via a parallel link type mounting device 10 so as to be able to rise and fall freely. The gauge wheel 9 can be adjusted up and down by an adjustment lever 11.

As shown in FIGS. 2 and 3, the upper surface of the rear side of the mower deck 5 is a horizontal plane that is one step lower than the front side, and a pair of left and right stays, etc. are installed at the center of the front part of the surface in the width direction. The transmission case 12 is fixed through the transmission case 12, and the transmission case 12 has a vertical cylinder body 13 and a horizontal cylinder body 14 that projects rearward from the middle part in the height direction.
It is constructed in a T-shape. The horizontal cylinder body 14 is located at a higher level than the front upper surface of the mower deck 5, and is provided with an input shaft 15 that projects rearward and is rotatable via a bearing 16, and the input shaft 15 is freely rotatable to a mid-PTO shaft 17 of a tractor. They are interlocked and connected via a joint shaft 18. The vertical cylinder body 13 is slightly floating above the rear upper surface of the mower deck 5, but its lower end is lower than the front upper surface of the mower deck 5. The vertical cylindrical body 13 has openings 19 and 20 at its upper and lower ends, and the upper opening 19 is closed by a detachable cap 21. The vertical cylinder body 13 is provided with a drive-side cutter shaft 6 passing through a lower opening 20 so as to be rotatable around the vertical axis via a pair of upper and lower bearings 22 and 23.
This drive side cutter shaft 6 is the bevel gear mechanism 24
It is interlocked and connected to the input shaft 15 via. A sealing member 25 such as an oil seal located below the lower bearing 23 is interposed between the inner circumferential surface of the lower end of the vertical cylinder body 13 and the outer circumferential surface of the drive-side cutter shaft 6 . Further, an annular groove 26 that opens downward is formed in the lower end surface of the vertical cylinder body 13 so as to be concentric with the drive-side cutter shaft 6 . Vertical barrel 13 on the drive side cutter shaft 6
A sheet metal drive pulley 27 is removably keyed to the lower side. The drive side pulley 27 is
Power is transmitted via a V-belt 29 to driven-side pulleys 28 fixed to the driven-side cutter shaft 7 on both sides, and the belt 29 is wrapped around the bottom wall facing the lower end surface of the vertical barrel 13. The lower end of the vertical cylinder 13 is inserted downward from the upper opening of the pulley 27, and the upper surface of the bottom wall and the vertical cylinder are formed into a bowl shape with an upper opening. 1
3. It faces the lower end surface with a small gap. A short pipe material is welded to the upper surface of the bottom wall of the drive-side pulley 27, and the pipe material is inserted into the annular groove 26 of the vertical cylinder body 13 from the lower end opening upwardly over the entire length in the circumferential direction. constitutes an annular wall portion 30 having a shape,
Here, the annular groove 26 and the annular wall portion 30 form a labyrinth structure. The lower side of the drive-side cutter shaft 6 is inserted through a bearing case 31 fixed to the mower deck 5, and the bearing 3 is inserted into the bearing case 31.
2, and the lower end of the drive-side cutter shaft 6 is provided with a protector 33, etc. located within the bearing case 31 by spline connection, etc.; 8 is fixed with a bolt 34. 35 is a sealing member such as an oil seal. The driven cutter shaft 7 is also provided in the bearing case 31 in the same manner as described above, and the driven cutter shaft 7 is provided with a cutter 8 in the same manner as described above. In addition, drive side/driven side pulleys 27, 28 and V belt 21
The winding transmission mechanism 36 constituted by 9 is covered with a cover 37 fixed to the mower deck 5.

By the way, during reaping work, grass, dirt, etc. are collected from the cover 3 through the gap between the mower deck 5 and the cover 37.
7, but in the past, the lower end surface of the vertical cylindrical body 13 of the transmission case 12 and the drive side pulley 2
Since the upper surface of 7 is simply opposed to the upper surface of drive-side pulley 27 with a predetermined gap, the grass, dirt, etc. that have entered may be trapped between the lower end surface of vertical cylinder 13 and the seal member 25 located at the lower end of the vertical cylinder 13 and the upper surface of drive-side pulley 27. , and presses the sealing member 25, causing the sealing member 25
This may cause oil leakage from the transmission case 12, leading to breakage or damage to the transmission mechanism within the transmission case 12.

However, in the embodiment of the present invention, a downwardly opening annular groove 26 is formed on the lower end surface of the vertical cylinder body 13 of the transmission case 12 so as to be concentric with the drive-side cutter shaft 6, and an annular groove 26 is formed on the upper surface of the drive-side pulley 27. Groove 2
Since the annular wall portion 30 that fits into the drive side pulley 27 is formed to form a labyrinth structure,
Grass, dirt, etc. that fell into the pulley 27 from the upper opening and entered the pulley 27 rises once and is folded back at the upward gap on the outside of the annular groove 26 and the annular wall 30 and at the bottom of the annular groove 26. Unless it passes through the inner downward gap, it cannot enter between the seal member 25 and the upper surface of the bottom wall, and the grass cannot enter between the seal member 25 provided at the lower end of the vertical cylinder body 13 and the upper surface of the bottom wall of the drive pulley 27. It can effectively prevent the intrusion and accumulation of dirt, dust, etc.
Therefore, there is no risk that the sealing member 25 will be damaged or damaged by grass, dirt, etc., and there is no risk that the transmission mechanism within the transmission case 12 will be damaged or damaged due to oil leakage.

As detailed above, according to the present invention, there is no risk that the seal member at the lower end of the transmission case will be damaged or damaged by grass, dirt, etc. There is no risk of breakage or damage. The present invention has the above advantages, and
The pulley can be easily formed from sheet metal, and the annular wall can be easily manufactured by welding pipe material to the upper surface of the bottom wall of the pulley. Therefore, the structure is simple, can be implemented at low cost, and is practical. It's large.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a vertical cross-sectional view of a main part, and FIG. 3 is a cross-sectional view taken along the line A--A in FIG. 2. 4... Mid-mount mower, 5... Mower deck, 6, 7... Drive side/driven side cutter shaft, 8
... Cutter, 12 ... Transmission case, 13 ... Vertical cylinder, 14 ... Horizontal cylinder, 15 ... Input shaft, 25
... Seal member, 26 ... Annular groove, 27, 28 ...
...Drive side/driven side pulley, 29...V belt,
30...Annular wall portion, 36...Wrap transmission mechanism, 37
……cover.

Claims (1)

[Scope of utility model registration request] The mower deck 5 is provided with a transmission case 12 which rotatably has an input shaft 15 and opens downward, and the cutter shaft 6 which is interlocked with the input shaft 15 and has a cutter 8 at its lower end is attached to the transmission case 12. A sealing member 25 is interposed between the inner circumferential surface of the lower end of the transmission case 12 and the outer circumferential surface of the cutter shaft 6 so that the lower end of the transmission case 12 is rotatable through the opening around the vertical axis. In the mower 4 equipped with a sheet metal pulley 27 formed in the shape of a bowl with an upper opening, the mower 4 includes a bottom wall portion facing the end surface and a peripheral wall portion transmitting power to the other cutter shaft 7 via a belt or the like. The lower end of the transmission case 12 is inserted downward through the upper opening of the transmission case 12, and an annular groove 26 opening downward is provided on the lower end surface of the transmission case 12, concentrically with the cutter shaft 6, and facing the annular groove 26. An annular wall portion 3 made of a pipe material is inserted into the annular groove 26 on the upper surface of the bottom wall portion upwardly from the lower end opening thereof over the entire length in the circumferential direction.
A cutter drive device for a mower, characterized in that 0 is welded.