JPH0335715A - Grass cutter of riding grass mower - Google Patents

Abstract

PURPOSE:To obtain the subject apparatus capable of smoothly discharging cut grass with high grass cutting performance and hardly and grass cutting resistance by providing a ceiling wall of a mower deck with a transmission shaft having cutting blades in the center and left and right back thereof and joining projecting depths corresponding to rotation loci of the cutting blades on the back side of the ceiling wall. CONSTITUTION:In a grass cutter 6, liftable and lowerable through hanging and holding links 5, simultaneously drivable, interlocked and connected to the abdominal underside of a car body 1, the central transmission shaft 11 and left and right transmission shafts 12 and 13 positioned at the back of the above-mentioned shaft are provided so as to be rotated and driven in the same direction as that of the central transmission shaft. Reaping blades 14 are simultaneously mounted on the lower sides of the aforementioned transmission shafts and three cut grass discharging passages 22, 23 and 24 are formed on the ceiling wall 7 so as to successively increase the upward projecting depths in the rotational direction of the cutting blades 14 from the back side are provided so that the passages may correspond to rotation loci of the three cutting blades. Thereby, the three passages join in a discharge port part 25 at the back of a mower deck 10 to construct the grass cutter 6 of a riding grass mower.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applied to a grass cutting VIM connected to an agricultural tractor, a lawn tractor ride mower, or the like.

[Prior art]

As disclosed in Japanese Utility Model Application Publication No. 60-10427, the rear of the deck that covers the upper part of the blade of a multiple rear discharge mower is opened as a discharge port, and a sub-decks are hung around the blade drive shaft toward the bottom surface of the deck. A blade guide is installed vertically toward the outer circumference of the blade and the discharge port.

[11 Problems to be Solved by the Invention] In the prior art, the blade guide is provided on the underside of the deck, so the part where the blade guide is provided has a double structure of the deck and the blade guide, which increases the weight of the mower. This has the problem of making it difficult to handle.

[Means to solve the problem]

In order to solve the above problems, the present invention takes the following technical measures. In other words, in a mowing device that is movable up and down via a suspension link on the underside of the vehicle body and is drivably connected, the mowing device has a central transmission shaft mounted on the ceiling wall and left and right transmission shafts located behind this shaft. The transmission shafts are provided so that they are rotated in the same direction, and these transmission shafts are I+e
A cutting blade is installed at the lower end of the JA, and three walls are formed on the ceiling wall so that the depth of the protrusion gradually deepens upward along the rotational direction of the cutting blade, so as to correspond to the rotation trajectory of these three cutting blades. The grass clippings discharge passages are constructed so that they merge at the discharge outlet at the rear of the moadetsuki.

[Action of the invention]

In a garden where grass grows, when the mowing device is lowered and driven, and the car body is driven, each cutting blade rotating in the same direction sequentially cuts the grass that enters the mower in its rotation stroke from the rear to the front. During the rotational stroke from the front side to the rear side, the grass clippings are discharged along the grass clipping discharge passages toward the discharge port at the rear of the mower deck.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

First, the configuration of the first embodiment shown in FIGS. 1 to 3 will be described. A grass cutting device 6 is pivoted to the lower ends of cross-shaped suspension links 5, 5 whose upper ends are pivoted to the machine frame 4 under the abdomen between the front wheels 2, 2 and the rear wheels 3, 3 of the vehicle body 1 of the lawn tractor. At the same time, it is provided so that it can be raised and lowered by a lift device (not shown) of the vehicle body 1. This mowing device 6 includes a ceiling wall 7, an arc-shaped front wall 8, and a side wall 9 that is connected to the front wall 8 in an arc shape and whose rear end faces toward the center.
- The central transmission shaft 11 and the left and right transmission shafts 12 and 13 located on the rear side of the central transmission @ 11 are rotatably supported in the vertical direction on the ceiling wall 7 of the Moadetsuki IO, which is integrally formed with the central transmission @ 11. Cutting blades 14, 14, 14 are attached to the lower ends of these transmission shafts 1, 2, 13, and a V-pulley 15 is provided at the upper end of the central transmission shaft 11.
Passive V pulleys 16 and 17 are provided at the upper end of 3, and this input crab step pulley 15 and the left and right passive V pulleys 6 and 17
Pass the V-belt 18 over these transmission shafts 11 and 12.
13 is configured to rotate clockwise, and a V-belt 21 is connected to an output V-pulley 20 that projects downward from the prime mover 19 of the vehicle body 1. Then, on the ceiling wall 7, the depth of the upward protrusion deepens sequentially from the rear side along the rotational direction of the three cutting blades 14, 14, 14, corresponding to the same rotation locus of the three cutting blades 14, 14, 14. The three cut grass discharge passages 22, 23, and 24 formed in this manner are configured to merge in front of the rear discharge port 25 of the moadetsuki IO. A grass clippings storage device 26 is provided at the rear end of the machine frame 4, and a grass clippings storage device 26 is provided at the rear end of the machine frame 4.
A discharge tube 27 formed of a flexible member and connected to the mower 5 is placed along the lower side of the vehicle body l, and its rear end is connected to the grass clippings storage device 26. An exhaust fan 28 driven from the vehicle body 1 is provided in the exhaust pipe 27.

Next, a second embodiment shown in FIGS. 4 to 5 will be described.

The central transmission shaft 1 and the left and right transmission shafts 12 and 13 supported on the ceiling tank 7 of the moadetsuki 10 are configured to drive and rotate clockwise, corresponding to the rotation locus of the cutting blades 414 and 14 on the ceiling wall 7. Then, from the rear side, the widths of the grass clippings discharge passages 29, 30, and 31, which are formed so as to gradually deepen upwardly in the direction of rotation of the cutting blades 4, 14, and the cutting blades 4, are small, medium, and small from the left side. By changing the wind power to a large one, the structure is such that weak wind power is discharged from the grass clippings discharge passage 29, medium wind power is discharged from the grass clippings discharge passage 30, and strong wind power is discharged from the grass clippings discharge passage 31.

The operation of the first embodiment will be explained. In a lawn garden, when the mowing device 6 is lowered and driven, and the vehicle body 1 runs to perform mowing work, the rotational power of the output V-pulley 20 driven by the prime mover 19 is transferred to the input stage via the V-belt 21. It is transmitted to the V-pulley 15, and is also transmitted to the central transmission shaft 1 via the V-belt 18 and driven pulleys 16 and 17.
1 and the left and right transmission shafts 12, 13, the cutting blades 14, 14, 14 rotate clockwise, and the lawn grass entering the mower deck 10 is sequentially cut, and the cutting blades 14, 14, and 4 - The grass clippings discharged rearward along the grass clippings discharge passages 22, 23, and 24 by the centrifugal force and wind power generated by the wind turbine 14 are discharged from the rear discharge port 25 through the discharge tube 27, and the grass clippings are discharged by the feeding action of the discharge fan 28. It is discharged to the storage device 26.

In the case of the second embodiment, the cut grass cut by the cutting blades 14, 14, and the cutter 4 are transferred to the cut grass discharge passages 29, 30, and 4.
The grass clippings are discharged backward through the cutting blades 14, 14, 1.
Due to the centrifugal force caused by the clockwise rotation of the grass clippings 4, the grass tends to be discharged to the left side, but a large amount of air flows out from the grass clippings discharge passage 31 on the right side, and a small volume of air flows out from the grass grass discharge passage 30 on the left side. Since the width of the passage is changed so that the grass can come out, the air volume and the centrifugal force of the cutting blades 14 are balanced, and the grass clippings are discharged to the left and right center of the rear discharge port 25.

〔Effect of the invention〕

In short, this invention is a grass mowing device that is movable up and down via a suspension link under the belly of the vehicle body and is connected in a drivable manner. The left and right transmission shafts are installed so that they are driven and rotated in the same direction, and the cutting blades are installed at the lower ends of these transmission shafts. The three grass clippings discharge passages, which are formed so as to protrude upward in increasing depth in the direction of rotation, are configured so that they meet at the discharge opening at the rear of the mower deck, so that each cutting blade passes through each of the grass clippings discharge passages. The mower deck can be smoothly discharged to the rear of the mower deck, and therefore, the mowing resistance inside the mower deck can be reduced and the quality of mowing outside can be improved.

[Brief explanation of drawings]

Drawings Fig. 1 is a plan view of the main parts of the first embodiment, Fig. 2 is a side view thereof, and Fig. 3 is an overall side view. Fig. 4 is a plan view of the main parts of the second embodiment. Figure 5 is a side view thereof. Explanation of main symbols

Claims (1)

[Claims] (1) In a grass mowing device that can be raised and lowered via a suspension link on the underside of the vehicle body and is drivably connected, the mower deck has a central transmission shaft mounted on the ceiling wall and left and right shafts located behind this shaft. Transmission shafts are installed so that they rotate in the same direction, and cutting blades are installed at the lower ends of these transmission shafts, and the rotation of the cutting blades is installed from the rear side on the ceiling wall to correspond to the rotation locus of these three cutting blades. A mowing device for a riding mower, characterized in that three grass clippings discharge passages are formed so as to protrude upward in a progressively deeper direction, and are configured to merge at a discharge port at the rear of a mower deck.