JPH0214353Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a mower cutter drive device, particularly a pulley mounting structure on the drive-side cutter shaft where power is transmitted from the input shaft and transmitted to other cutter shafts. Regarding.

[Prior art]

For example, the mower 4 attached to the lower abdomen of a tractor is shown in FIGS. 2 and 3, where 1 is the tractor body, 2 is the front wheel, and 3 is the rear wheel. It is equipped with a plurality of cutters 8 attached via driving side and driven side cutter shafts 6 and 7, and a gauge wheel 9 for regulating the cutting height arranged before and after the mower deck 5, and is mounted in a parallel link type. The gauge wheel 9 is attached to the lower abdomen of the tractor body 1 via a device 10 so as to be able to rise and fall freely, and the gauge wheel 9 can be adjusted up and down using an adjustment lever 11. 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 the transmission case 12 is attached to the deck cover 5a that covers the upper part of the front part of the horizontal plane through a pair of left and right stays. The transmission case 12 is fixed, and the transmission case 12 is connected to the vertical cylinder 13 and the horizontal cylinder 14 that projects rearward from the middle part in the height direction.
It is structured in the form of a letter.

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 cylinder body 13 has openings 19 and 20 at the upper and lower ends,
The upper opening 19 is closed by a detachable cap 21. In the vertical cylinder body 13, the drive-side cutter shaft 6 passing through the lower opening 20 is fitted with a pair of upper and lower bearings 22, 2.
3, and this drive-side cutter shaft 6 is supported rotatably around a vertical axis via a pair of bevel gears 2.
It is interlocked and connected to the input shaft 15 via 4a and 24b. A sealing member 25 such as an oil seal located below the 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 .

A sheet metal drive pulley 27 is removably keyed to the drive side cutter shaft 6 on the lower side of the vertical cylinder body 13. The driving pulley 27 transmits power via a V-belt 29 to the driven pulleys 28 fixed to the driven cutter shafts 7 on both sides thereof, and the lower end side of the vertical barrel 13 is in an internal shape. It is said to be bowl-shaped,
Its upper surface faces the lower end surface of the vertical cylindrical body 13 with a small gap therebetween.

The lower side of the cutter shaft 6 is inserted through a bearing case 31 fixed to the mower deck 5 below the transmission case 12, and is rotatably supported by the bearing case 31 by a bearing 32, and the lower end of the cutter shaft 6 The cutter receiving member 33 and the like located in the bearing case 31 are provided by spline fitting or the like, and the cutter 8 is fixed to the lower end of the cutter shaft 6 by a fastener 37 having a bolt 34 and a disc spring 36. There is. 35 is a sealing member such as an oil seal.

[Problem that the invention attempts to solve]

In such a conventional device, the lower surface of the pulley 27 is in contact with the bearing 32 and its position is restricted, but the upper surface is only stopped by the snap ring 40 fitted to the cutter shaft 6, and the fastener 37
The structure was not such that it could be tightened by hand, but instead it was floating on the cutter shaft, with looseness and vibrations that were likely to cause oxidative wear.

[Means to solve the problem]

In view of the problems of the conventional device, the present invention is designed to make the drive-side cutter shaft 6 larger in diameter at the upper part of the pulley 27 and to be able to slide slightly in the axial direction, and to fasten the fastener 37 of the cutter 8. Therefore, it is an object of the present invention to provide a mower cutter drive device in which a pulley 27 can be firmly fixed between a bearing 32 whose position is regulated by a bearing case 31 and a cutter shaft large diameter portion 41.

A feature of the present invention for achieving this purpose is that the cutter shaft is rotatably supported around the vertical axis via bearings in a bearing case fixed to the mower deck and a transmission case fixed above the mower deck, respectively. A pulley is fitted to the cutter shaft between both bearings, a cutter receiving member is fitted to the lower part of the cutter shaft within the bearing case, and the cutter is held between the cutter receiving member and the fastener provided at the lower end of the cutter shaft. In the cutter drive device, the cutter shaft has a large diameter portion that comes into contact with the upper surface of the pulley and is able to slide slightly in the vertical direction, and the lower bearing is prevented from moving upward by a bearing case, and the cutter shaft has a large diameter portion that contacts the upper surface of the pulley. The main feature is that the member and the cutter are held together by the large diameter portion and the fastener.

[Effect]

Screw in the bolt 34 of the fastener 37 and attach the disc spring 36.
When the cutter 8 is pressed against the cutter receiving member 33 through A pulley 27, a bearing 32, and a cutter receiving member 33 are held together, and the upward movement of the bearing 32 is restricted by a bearing case 31. The pulley 27 is tightened between the bearing 32 and the large diameter portion 41, and the cutter is held in place. It is firmly fixed to the shaft 6. The downward sliding of the cutter shaft 6 is carried out by a bevel gear 24a.
A gap A is provided above, and the upper end of the cutter shaft and the bearing 2
This is allowed because the position with respect to 2 is not fixed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the cutter shaft 6 is connected to the mower deck 5.
It is rotatably supported around a vertical axis by a bearing case 31 fixed to a bearing case 31 and a transmission case 12 fixed above it, and a bearing 22 supporting the upper end of the cutter shaft is supported by the cap 21, and is connected to the cutter shaft 6. Relative axial movement is possible.

A large diameter portion 41 is formed approximately at the center of the cutter shaft 6, and the upper surface of this large diameter portion 41 abuts the bearing 23.
The lower surface is in contact with the upper surface of the boss portion 27a of the pulley 27.

The bevel gear 24a spline-fitted to the cutter shaft 6 above the bearing 23 is movable relative to the cutter shaft 6, but its downward position is substantially restricted by the bearing 23, ensuring meshing with the bevel gear 24b. and a collar 42 placed above it.
A slight gap A is provided between the cutter shaft 6 and the snap spring 43 on the cutter shaft 6, allowing the cutter shaft 6 to slide downward.

The cutter receiving member 33 spline-fitted to the lower end of the cutter shaft 6 supports the cutter 8 and also serves to close the lower end opening of the bearing case 31 and prevent dust from entering between the cutter shaft 6 and the cutter 8. The upper end is in contact with the bearing 32 and the lower end is in contact with the cutter 8.

A slight gap B is formed between the lower end surface of the cutter shaft 6 and the shaft portion 34a of the bolt 34 screwed therein, and as the bolt 34 is tightened to narrow this gap B, the disc spring 36 is compressed, and the cutter 8 is pressed against and held by the cutter receiving member 33.

The bearing 32 is located at the positioning portion 4 of the bearing case 31.
4 and the upward position is specified, and even if the bolt 36 is tightened more strongly, the bearing 32
There is no upward movement of the cutter receiving member 33, but on the contrary, a downward pulling force acts on the cutter shaft 6, and the large diameter portion 41 is pressed toward the pulley 27 side. As a result, the pulley 27 and the bearing 32 are connected between the large diameter portion 41 and the fastener 37.
The cutter receiving member 33 and the cutter 8 are sandwiched, and the boss portion 27a of the pulley 27 is sandwiched between the large diameter portion 41 and the bearing 32 without play.

[Effect of idea]

According to the present invention described in detail above, the large diameter portion 41 that comes into contact with the upper surface of the pulley 27 is formed on the cutter shaft 6,
In addition, by making the cutter shaft 6 slightly slidable in the vertical direction and fastening the fastener 37, the large diameter portion 4
1 and the cutter 8 sandwich the pulley 27, the bearing 32, and the cutter receiving member 33, and the bearing 32 is attached to the bearing case 3.
As a result, the cutter shaft 6 is slid downward and the large diameter portion 4 is restricted.
1 and a bearing 32, which allows the pulley 27 to be firmly tightened and fixed to the cutter shaft 6.
No. 7 looseness is eliminated and oxidative wear can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figure is a side view of a mower to which the present invention is applied, and FIG. 3 is a longitudinal sectional view of a conventional device. 4... Mid-mount mower, 5... Mower deck, 6... Drive-side cutter shaft, 8... Cutter, 1
2...Transmission case, 27...Pulley, 31...Bearing case, 32...Bearing, 33...Cut receiving member, 37...Fastener, 41...Large diameter portion, A, B...
…gap.

Claims (1)

[Scope of Claim for Utility Model Registration] Bearings 23,
The cutter shaft 6 is rotatably supported around the vertical axis through the bearing case 31, and the pulley 27 is fitted to the cutter shaft 6 between the two bearings 23 and 32. 33, and the fastener 3 provided on the cutter receiving member 33 and the lower end of the cutter shaft.
In the mower cutter drive device in which the cutter 8 is held between the mowers 7 and 7, the cutter shaft 6 has a large diameter portion 41 that contacts the upper surface of the pulley 27 and is slightly slidable in the vertical direction, and the lower bearing 32 is a bearing. The case 31 prevents upward movement of the pulley 27 and the cutter receiving member 33.
A cutter drive device for a mower, characterized in that the cutter 8 is held between a large diameter portion 41 and a fastener 37.