JPS606184Y2 - Mower cutter drive device - Google Patents

Description

[Detailed description of the invention] The present invention relates to cutter drive devices for various types of mowers, such as mid-mount types, which facilitates centering of the drive wheel body and cutter with respect to the cutter shaft, and prevents rattling of each mounting part. Furthermore, when overloaded, slippage occurs at two locations, between the cutter and the cutter shaft, and between the cutter shaft and the drive wheel body, thereby making it possible to alleviate the impact.

In a mid-mount mower, etc., a cutter shaft is rotatably mounted on a mower deck around a vertical axis 6, and a drive pulley is provided at the upper end of the cutter shaft, and a cutter is provided at the lower end via a cutter holder. Conventionally, the drive pulley and cutter were spline-coupled to the cutter shaft, which resulted in poor mutual centering due to backlash in the spline parts, and the backlash generated noise during driving.

Moreover, in the case of a spline structure, wear of the spline portion progresses due to rattling, which poses a major problem in terms of durability.

Furthermore, in the past, if an overload was applied to the cutter, it could not be absorbed between the drive pulley and the cutter, and therefore it was necessary to provide a special overload prevention device in other power transmission systems. There was a problem in that the production cost increased.

The present invention was provided with the aim of solving these conventional problems, and its feature is that the upper end of the cutter shaft is rotatably mounted around the vertical shaft 6. In a mower equipped with a drive wheel body and a cutter at the lower end, the cutter shaft has tapered portions at both upper and lower ends, and the drive wheel body and cutter are tapered fitted into each of the taper portions. The drive wheel body and cutter are fastened via an elastic body by a fastener that is screwed onto the cutter shaft.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
In the figure, 1 is a tractor body, 2 is a front wheel, and 3 is a rear wheel.

Reference numeral 4 denotes a mid-mount mower, which includes a mower deck 5, a plurality of cutters 7 attached to the mower deck 5 via cutter shafts 6, and cutting height regulating mowers arranged before and after the mower deck 5. It is equipped with a gauge wheel 8 and the like, and is mounted on the lower abdomen of the tractor body 1 via a parallel link type mounting device 9 so as to be able to rise and fall freely.

The gauge wheel 8 can be adjusted up and down by an adjustment lever 10.

11 is a front power take-off device;
The cutter shaft 6 is configured to be driven from the drive shaft 12 through the drive shaft 12.

The cutter shaft 6 is mounted on a bearing case 13 attached to a mower deck 5 as shown in FIG.
The cutter shaft 6 is rotatably mounted around a vertical shaft 6 via a shaft 4.15, and a tapered portion 17.18 and a female screw portion 19.20 are provided at both upper and lower ends of the cutter shaft 6.

A mounting boss 22 of a drive pulley 21 is tapered fitted into the tapered portion 17 of the cutter shaft 6 through a tapered hole 23, and the mounting boss 22 is fitted onto the female threaded portion 1.
It is fastened to the cutter shaft 6 via a disc spring 25 by a tightening bolt 24 screwed into the cutter shaft 9 .

On the other hand, a cutter receiver 27 is tapered fitted into the tapered portion 18 of the cutter shaft 6 through a tapered hole 26, and the cutter receiver 27 is secured to the cutter shaft 6 by a tightening bolt 28 screwed into the female threaded portion 20. and is fastened to the cutter shaft 6 via a disc spring 29.

A groove 30 is formed in the lower surface of the cutter receiver 27 in the diametrical direction, and the cutter 7 is fitted into this groove 30 from below, so that the cutter 7 and the cutter receiver 27 rotate together.

The cutter receiver 27 is provided with a wrapping prevention wall 31 on its outer periphery to prevent grass or the like from wrapping around the cutter receiver 27 , and the upper end of this wrapping prevention wall 31 is fitted onto the bearing case 13 .

32 and 33 are rotation lock washers made of wear-resistant material.

34 is a belt.

Note that each of the tightening bolts 24, 28 has stepped portions 35, 36 that come into contact with the upper and lower end surfaces of the cutter shaft 6, but these may be omitted.

37 is a belt cover. According to the above configuration, it is easy to center the drive pulley 21 and the cutter 7 with respect to the cutter shaft 6, and it is possible to reliably prevent shaft vibration during rotation.

That is, there are tapered portions 17.1 at both upper and lower ends of the cutter shaft 6.
8, and a mounting boss 22 is attached to this tapered part 17.18.
Since the cutter receiver 27 and the cutter receiver 27 are fitted in a tapered manner, as long as the axes of the tapered portions 17 and 18 are exposed when machining the cutter shaft 6, the mounting boss 22 and the cutter receiver 27 can be fitted in a tapered manner during assembly. It is possible to perform centering easily and accurately.

In addition, the mounting boss 22 and cutter receiver 27 are attached with tightening bolts 24.
, 28 are fastened to the cutter shaft 6 via disc springs 25 and 29, power is transmitted from the belt 34 to the cutter shaft 6 via the drive pulley 21, and the cutter 7 is rotated around the cutter shaft 6. If the cutter 7 comes into contact with an obstacle or is overloaded when reaping the object to be harvested, the damage may occur between the mounting boss 22 and the cutter shaft 6, or between the cutter shaft 6 and the cutter receiver 27. slipping occurs,
This allows the impact force to be relaxed and absorbed.

In the above embodiment, the drive pulley 21 is used as the drive wheel body.
I used a sprocket as an example, but a sprocket may also be used.

Further, threaded portions may be provided at both upper and lower ends of the cutter shaft 6, and the mounting boss 22 and the cutter receiver 27 may be tightened via the disc springs 25 and 29 by means of tightening nuts that are screwed into the threaded parts. Instead of 29, it is also possible to use elastic bodies of various shapes, such as a spring washer.

In this invention, the drive wheel body and the cutter are attached to both the upper and lower ends of the cutter shaft in a taper-fitting state, so centering can be easily and accurately performed, and the installation can be done without any looseness or accompanying looseness. Abrasion, noise, etc. can be prevented.

In addition, since it is fastened with a fastener via an elastic body, overload can be alleviated at two locations.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with FIG. 1 being a partially cutaway side view and FIG. 2 being an enlarged sectional view of the main part. 1...Tractor body, 4...Mitsudo mount mower 5...Mower deck, 6...
...Cutter shaft, 7...Cutter 17.1
8...Taper part, 21...Drive pulley, 22...Mounting boss, 23°26...
...Tapered hole, 24.28...Tightening bolt,
25, 29... disc spring, 27... cutter holder.

Claims (1)

[Scope of utility model registration request] In a mower equipped with a drive wheel body at the upper end and a cutter at the lower end of a cutter shaft rotatably mounted around a vertical axis 6, a part of the taper is formed at both upper and lower ends of the cutter shaft, A mower characterized in that a drive wheel body and a cutter are tapered fitted into a portion of each taper, and the drive wheel body and cutter are fastened via an elastic body by a fastener that is screwed onto the cutter shaft. Cutter drive device.