JPH0214352Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cutter drive device for a mower, which reduces vibration of the belt, prevents contact due to vibration of the belt, reduces vibration of the mower, and furthermore, reduces the vibration of the mower to the tension pulley in the belt. The purpose of the belt is to extend the life of the belt by increasing the diameter of the wrapping portion of the belt.

For example, in the case of a mower that is attached to the lower abdomen of a tractor body so that it can be raised and lowered, as shown in FIG. Cutter shafts 8, 9, and 10 each having pulleys 5, 6, and 7 in a relatively non-rotatable manner are rotatably installed vertically, and near the right diagonally rear side of the center pulley 5 are cutter shafts 8, 9, and 10 that are connected to the input shaft 11 and are Drive side pulley 12
A drive shaft 13 is installed vertically so as to be relatively unrotatable.
A belt 14 is wound around each of the pulleys 5, 6, 7, and 12. The outer surface of the belt 14 between the center pulley 5 and the left pulley 6 is guided by the guide pulley 15, and the outer surface of the belt 14 between the center pulley 5 and the right pulley 7 is guided by the tension pulley. 16, tension pulley 1
6 is located between the center pulley 5 and the portion of the belt 14 between the side pulleys 6 and 7,
Moreover, it is located on the rear side of the driving pulley 12.

By the way, in the conventional art, although the tension pulley 16 is provided at the above-mentioned position, the pulleys 6 on both sides of the belt 14,
Since the 7-space area was a straight line in the width direction,
While maintaining an appropriate distance l between the part of the belt 14 that is wrapped around the tension pulley 16 and the part of the belt 14 between the side pulleys 6 and 7,
In order to provide the tension pulley 16, the diameter of the tension pulley 16 had to be made small.

For this reason, in the past, the diameter of the portion of the belt 14 wound around the tension pulley 16 was small, and the belt 14 was bent in an unreasonable manner, resulting in a short belt life.

Furthermore, in the past, a portion of the belt 14 between the tension pulley 16 and the right side pulley 7, and a portion of the belt 14 between the tension pulley 16 and the right side pulley 7,
Contact due to vibration between both parts of the gap and vibration of the mower due to the vibration have also been problems.

The present invention has solved the above problem, and its feature is that a cutter and a pulley are provided in the widthwise center of the mower deck and on the diagonally rear side on both left and right sides of the mower deck so that the cutter and the pulley cannot rotate relative to each other. The shafts are vertically arranged so as to be freely rotatable, a belt is wound around the center pulley and both side pulleys, and a belt is provided between the center pulley and the portion between the both side pulleys of the belt. In a belt equipped with a tension pulley in which the part between the pulleys on one side is wound on the outside surface side, the inner surface of the part of the belt between the tension pulley and the pulley on one side is placed between the tension pulley and the pulley on one side. The belt is provided with a guide pulley that guides the inner surface of the belt and has a rearwardly extruded portion between the pulleys on both sides of the belt.

Hereinafter, a first embodiment of the present invention will be explained based on the drawings of FIGS. 2 and 3. In FIG. 2, 20 is a tractor body, which includes an engine 21, a transmission case 22, and the like. 23 is the front axle frame, 24
25 is a front wheel, 25 is a rear wheel, and 26 is a bonnet.

A hydraulic system 28 for lifting and lowering the working machine is mounted on the rear part of the transmission case 22, and has a pair of left and right lift arms 27. A front power extraction device 29 is installed below the front axle frame 23, and The front PTO shaft 30 is provided to protrude rearward.

31 is a rotary type mid-mount mower,
Parallel link type mounting device 3 on the lower abdomen of the vehicle body 20
2. It is mounted so that it can be raised and lowered via a mounting bracket 33, and also includes a lifting cable 34, a bell crank 35, a rod 36, an engaging body 37, and a lower link 38.
It is raised and lowered by the hydraulic device 28 via the lift rod 39 and the lift rod 39.

The mower 31 has a mower deck 40 that is in the form of an inverted gutter and has an arrowhead shape in plan view, and the front part of the mower deck 40 is one step higher than the rear part. At the rear of the mower deck 40, there is a central cutter shaft 41 at the center in the width direction below the center of the vehicle body 20 in the width direction, and a pair of side cutter shafts 42 and 43 are located diagonally rearward on both sides thereof. It is rotatably installed vertically. These cutter shafts 41, 42, 43 are rotatably provided via bearings in a bearing case fixed to the mower deck 40, and the cutter shafts 44, 43 are provided at the lower end thereof.
45 and 46 are attached so that they cannot rotate relative to each other.
Further, a center pulley 47 and side pulleys 48, 49 are attached to the upper ends of the center cutter shaft 41 and the side cutter shafts 42, 43, respectively, so that they cannot rotate relative to each other. Reference numeral 50 denotes a transmission case, which is located near the rear diagonally right side of the central cutter shaft 41 and pulley 47, and is provided on the upper surface of the rear side of the mower deck 40. An input shaft 51 projects forward from the transmission case 50, and the input shaft 51 is operatively connected to the front PTO shaft 30 via a transmission shaft 52. A drive shaft 53 that interlocks with the input shaft 51 via a bevel gear mechanism is installed below the transmission case 50, and a drive pulley 54 is attached to the lower end of the drive shaft 53.
is provided so as to be relatively non-rotatable. Reference numeral 55 denotes a belt, which is wound around each of the pulleys 47, 48, 49, 54 on its inner surface, and is attached to each of the pulleys 47, 48,
49 and 50 are linked.

56 is the left guide pulley, which is the center pulley 4.
Near the diagonally rear side of the left side of 7, the mower deck 40
The belt 55 is rotatably provided via a support shaft 57, and guides the outer surface of the portion of the belt 55 between the center pulley 47 and the left pulley 48.

Reference numeral 58 indicates a tension pulley, which includes a central pulley 47 and pulleys 4 on both sides of the belt 55.
8 and 49, and the drive side pulley 54 and the right side pulley 4 of the belt 55.
The 9-way part is wrapped around the outside. The tension pulley 58 is rotatably provided at the tip of the swing arm 59 via a support shaft 60. The swinging arm 59 is swingably provided on the mower deck 40 on the rear side of the central pulley 47 via a support shaft 61, and is biased toward the left side by a bullet 62 and a rod 63. The rod 63 is fixed to a bracket 64 on the rear left side of the mower deck 40 so that it can be screwed forward and backward.

Reference numeral 65 denotes a right guide pulley, which is disposed intermediate between the tension pulley 58 and the right side pulley 48 and is rotatably provided on the mower deck 40 via a support shaft 66. Right guide pulley 65
is the tension pulley 58 on the belt 55
and the right side pulley 49, and also guides the inner surface of the portion between the right side pulley 49 and the both side pulleys 4 on the belt 55.
The inner surface of the portion between 8 and 49 is guided, thereby reducing the vibration of each part of the belt 55, preventing contact due to vibration of each part of the belt 55, and reducing the vibration of the mower 31. . In addition, the right guide pulley 65 pushes out the portion of the belt 55 between the side pulleys 48 and 49 rearward to project more rearward than the both side pulleys 48 and 49, so that the center pulley 4
7 and both side pulleys 4 on the belt 55
The distance between the 8 and 49 parts is larger than before,
As the tension pulley 58, a pulley with a larger diameter than before is used. Therefore, the diameter of the portion of the belt 55 that wraps around the tension pulley 58 is larger than that of the conventional one, and the belt 55 is wrapped around the tension pulley 58.
Since the belt 55 is not wound around the belt 8 in an unreasonable manner, the life of the belt 55 can be extended compared to the conventional belt. Sho belt 55
The portion wrapped around the tension pulley 58 in the belt 55, and the pulleys 48 on both sides of the belt 55,
The interval L between 49 and 49 is also sufficient.

A cover 67 covers the belt winding mechanism and is attached to the mower deck 40. 68
is a discharge cover, which is provided on the right side of the mower deck 40. 69 is a gauge wheel for adjusting the cutting height, and 70 is a limit gauge wheel for preventing the mower deck 40 from touching the ground.

FIG. 4 shows a second embodiment of the present invention, in which the central cutter shaft 41 also has the function of the drive shaft in the first embodiment, and the central pulley 47 has the following functions:
It also has the function of the driving pulley in the first embodiment. Further, a left guide pulley is not provided, and the tension pulley 58 and the swing arm 59 are arranged near the left diagonally rear side of the center pulley 47. Further, the transmission case 50 is disposed above the central pulley 47 at the center in the width direction of the mower deck 40, and an input shaft 51 projects rearward from the transmission case 50.

As detailed above, according to the present invention, the guide pulley guides the inner surface of the belt between the tension pulley and the right side pulley, and the inner surface of the belt between the both side pulleys. It is possible to reduce the vibration of each of the parts of the belt, thereby preventing the parts of the belt from coming into contact due to vibration, and reducing the vibration of the mower. In addition, since the guide pulley guides the belt between the pulleys on both sides in an extruded manner backwards, a pulley with a larger diameter than before can be used as the tension pulley, making it easier to wrap the belt around the tension pulley. Since the diameter of the part can be made larger, the belt can be wound around the tension pulley without difficulty, and the belt can have a longer life. The present invention has the various advantages mentioned above and is of great practical benefit.

[Brief explanation of the drawing]

Figure 1 is a plan view of a mower showing a conventional example, Figure 2 is a plan view of a mower showing a conventional example;
Figures 3 and 3 show the first embodiment of the present invention, and the second embodiment
The figure is an overall side view, the third figure is a plan view of the mower, and the fourth figure is a top view of the mower.
The figure is a plan view of a mower showing a second embodiment of the present invention. 31... More, 40... More Detsuki, 4
1, 42, 43... cutter shaft, 44, 45, 4
6... cutter, 47, 48, 49... pulley, 55... belt, 56... left guide pulley, 58... tension pulley, 65... right guide pulley.

Claims (1)

[Scope of utility model registration request] Cutter shafts each having a cutter and a pulley that cannot be rotated relative to each other are installed vertically in the widthwise central part of the mower deck and on the diagonally rear side on both left and right sides of the mower deck. A tension pulley is provided between the center pulley and the portion of the belt between the center pulley and the one side pulley, on which the outer surface of the belt is wound. In the belt, the inner surface of the belt between the tension pulley and the one side pulley is guided between the tension pulley and the one side pulley, and the inner surface of the belt is formed into a backward extruded shape. A cutter drive device for a mower, comprising a guide pulley for guiding.