JPH07246009A - Light-weight riding tractor - Google Patents

Abstract

PURPOSE:To get a high rotational speed unattainable by conventional PTO shaft for rice transplantation,independently of the running speed of a tractor, and properly operate a power duster, etc., to be attached in place of a transplanting apparatus. CONSTITUTION:The blower of a power duster is rotated at a high speed by operating a clutch 6 and directly transmitting the power of an engine 1 to the output shaft 50 of a power transmission mechanism 5 without passing through a transmission 2. The additional mechanism is harmless to the operator because the power transmission mechanism 5 is placed under an operator's step 30 of the traveling machine body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a riding type lightweight tractor capable of performing not only rice planting work but also management work such as spraying of fertilizers and granules, spraying of chemicals and the like.

[0002]

2. Description of the Related Art Conventionally, a lightweight tractor applied to a normal riding type rice transplanter is provided with a so-called PTO shaft for extracting power to a work machine with a plant on a mission mounted on a traveling machine body, and a rear part is provided through this shaft. The power is transmitted to the planting work machine, and the planting operation suitable for the traveling speed can be performed.

[0003]

However, in recent years, the planting work machine has been removed from the riding type lightweight tractor exclusively for rice planting, and instead, a fertilizer sprayer, a chemical sprayer, etc. have been attached to control the planting in addition to rice planting. Attempts are being made to do this work,
In such a case, there is a problem that the output taken out to the PTO shaft through the mission has a predominantly low rotation speed.
This is because the PTO shaft is originally designed to take out high-torque, low-speed power assuming rice transplanting work.
In this case, it is conceivable to install a speed increaser in the latter stage of the PTO shaft to increase the rotation, but since the rotation speed of the PTO shaft changes in conjunction with the traveling speed, the amount of fertilizer sprayed, etc. may change depending on the traveling speed. It will change and it will be difficult to perform appropriate fertilization work, and it will not be possible to solve the problem.

The main object of the present invention is to take out power directly from the engine and supply it to the working machine side, regardless of the traveling speed.
The point is to provide a riding-type lightweight tractor that can obtain appropriate power when performing administrative work such as a sprayer or a sprayer.

[0005]

In order to achieve the above main object, the invention according to claim 1 is a riding type lightweight tractor in which a working machine 4 is provided behind a traveling machine body 3 having an engine 1 and a mission 2. In the vehicle body 3, below the occupant step 30, the power take-out portion 51 is provided at the front portion of the front axle case 70 to take out the power of the engine 1 from the front stage position of the mission 2, and from the take-out portion 51. A power transmission unit 52 that transmits the power to be taken out over the upper portion of the front axle case 70 to near the rear axle case 80, and an output shaft 50 that outputs the power transmitted by the transmission unit 52 to the rear of the traveling machine body 3.
The power transmission mechanism 5 having the above is provided, and the operation of the output shaft 50 in the power transmission mechanism 5 can be turned on / off by the intermittent operation of the clutch 6.

The invention according to claim 2 is the passenger step 3
In order to favorably dispose the power transmission mechanism 5 below 0 and to enable the clutch 6 to be operated appropriately, the power take-out portion 51 transfers the power of the engine 1 to one side in the width direction of the traveling machine body 3. The clutch 6 is taken out to the side of the power transmission section 52 to be arranged, and the clutch 6 has an operation lever 61 having an operation end facing one side in the width direction of the traveling machine body 3.

According to the third aspect of the present invention, the output shaft 50 of the power transmission mechanism 5 is favorably supported.
The output shaft 50 of No. 1 was supported by the rear axle case 80.

According to the fourth aspect of the present invention, the output shaft 50 of the power transmission mechanism 5 is eccentric with the output shaft 50 so that the number of rotations taken out from the output shaft 50 of the power transmission mechanism 5 can be easily adjusted. A pair of gears 9 is attached to an input shaft 90 having an axis.
The output shaft 50 and the input shaft 90 are interlocked with each other through 1, 92, and the output shaft 50 and the input shaft 90 are supported in the point-symmetrical gear case 9 with their projecting directions reversed.

[0009]

In the invention described in claim 1, when the clutch 6 is engaged, the output shaft 5 passes from the power take-out portion 51 through the power transmission portion 52.
The direct power from the engine 1 that does not pass through the mission 2 is transmitted to 0. Therefore, regardless of the traveling speed, it is possible to extract the rotation speed that matches the working machine 4. The branch of the power from the engine 1 is provided at the front of the front axle case 70.
The power taken out of the power take-out portion 51 is transmitted to the vicinity of the rear axle case 80 over the upper portion of the front axle case 70, so that the entire power transmission mechanism 5 is carried by the passenger step 30 in the traveling machine body 3. It can be arranged below the vehicle and so as not to be lowered with respect to the positions of the axle cases 70 and 80. Even if such an additional mechanism is provided, it is possible to give a passenger a feeling of harm and oppression. If it is not, there is no harmful effect such as involvement of the crop during traveling.

According to the second aspect of the present invention, the power of the engine 1 is transmitted to the power transmission section 5 arranged on one side of the traveling machine body 3 in the width direction.
It is taken out to the 2 side and transmitted to the rear via the power transmission portion 52 arranged on the one side in the width direction. Therefore, the power transmission mechanism 5 can be compactly arranged while bypassing the portion of the mission 2. Also, the operating lever 6 of the clutch 6
1, the operating lever 61 is exposed to one side in the width direction of the traveling machine body 3, so that the clutch 6 can be appropriately operated.

According to the third aspect of the present invention, the rear axle case 80 can be utilized to favorably support the output shaft 50 of the power transmission mechanism 5.

According to the fourth aspect of the invention, the pair of gears 9
The gear ratios of 1 and 92 are appropriately selected, and the axial direction of the gear case 9 is changed to change the output shaft 50 and the input shaft 90.
By reversing the projecting directions of and, it is possible to easily change the number of rotations taken out to the output side.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The riding type lightweight tractor shown in FIGS. 1 to 3 has a traveling machine body 3 on which an engine 1 and a mission 2 are mounted and which is substantially on the center line in the vehicle width direction. At the top, driver's seat 31 and steering wheel 32
And a pair of front wheels 7, 7 via a front axle case 70 and a pair of rear wheels 8, 8 via a rear axle case 80 on both sides in the vehicle width direction.

As shown in FIG. 1, the engine 1 includes an output shaft 11, a dual power pulley 12, a dual belt 13,
The double counter pulley 14, the front universal joint 15, the main transmission shaft 16, and the rear universal joint 17 are interlocked with the mission 2 and the front wheels 7, 7 and the rear wheels 8 are passed through the axle cases 70, 80. , 8 as well as the PTO shaft 20 that transmits power to the planting work machine side for rice planting work.

At the rear of the traveling machine body 3, as shown in FIG. 2, a lower link 42 interlocking with a hydraulic cylinder 41,
An elevating device 40 having a top 42, a top link 43, and a hitch base 44 is provided, and the elevating device 40 is equipped with a working machine 4 that performs administrative work in place of a normal planting working machine.

The working machine 4 is composed of a power sprayer for spraying fertilizer, and has a fertilizer tank 4a for storing fertilizer to be applied, a blower 4b which is connected to an output shaft 50 described later and rotates at a high speed, and discharges fertilizer. A fertilizer hose 4c and the like are provided.

In the above structure, as shown in FIG.
It is arranged in the front part of the front axle case 70 below the occupant step 30 in the traveling body 3, and the engine 1
And a power transmission section 52 for transmitting the power extracted from this extraction section 51 to the vicinity of the rear axle case 80 over the upper portion of the front axle case 70, and this transmission section Part 5
A power transmission mechanism 5 having an output shaft 50 for outputting the power transmitted by 2 to the rear of the traveling machine body 3 is provided, and the operation of the output shaft 50 in the power transmission mechanism 5 can be turned on and off by an intermittent operation of the clutch 6. And

The power take-out section 51 supplies the power of the engine 1 to
This is taken out to the side of the power transmission section 52 arranged on one side in the width direction of the traveling machine body 3. The power take-out portion 51 is composed of an endless type power transmission body, and has a drive pulley 51a continuously connected to the double counter pulley 14, an endless belt 51b mainly made of a belt, and the other side of the drive pulley 51a. The driven pulley 51c is provided. Further, the power transmission unit 52 is the driven pulley 5
The transmission shaft 52b is connected to 1c via the front universal joint 52a, and the transmission shaft 52b is interlocked with the output shaft 50 side via the rear universal joint 52c.

The clutch 6 operates by following an operating lever 61, which has its operating end facing one side in the width direction of the traveling machine body 3 extending a power take-out portion 51 composed of an endless power transmission body. The tension pulley 62 that interferes with the endless belt 51b of the endless power transmission body 51 is provided.
More specifically, as clearly shown in FIG. 4, the clutch 6 is a so-called L-shaped tension clutch composed of an operating lever 61 and an arm 63 that pivotally supports a tension pulley 62. 61 is a pin body 61 in which the tubular boss portion 61a is loosely fitted into the shaft body 64.
and the arm 63 has a cylindrical boss 63.
Guide 6 in which a is received by shaft body 64 and is coupled by pin body 63b, and operation lever 61 is provided in box 65
By swinging along 6, the arm 63 is swung to follow and the tension pulley 62 is pressed against the endless belt 51b in a clutch-engaged state, and the tension pulley 62 is separated from the endless belt 51b. The clutch is released to release the pressing force. 67 is an urging body made up of a coil spring for constantly pressing the tension pulley 62 toward the endless belt 51b. Further, 68 tilts the operation lever 61 with respect to the shaft body 64 to allow the latch portion 66a or 66 of the guide 66 to rotate.
It is an auxiliary urging body consisting of a small coil spring held by b.

As shown in FIG. 3, the output shaft 50 of the power transmission mechanism 5 is supported in a gear case 9 described below, and the gear case 9 is attached to a rear axle case 80 via a mounting plate 81. I support you.

As shown in FIGS. 5 and 6, the output shaft 50 is supported in the gear case 9 together with the input shaft 90 which is connected to the rear universal joint 52c provided at the end of the interlocking body 52. The output shaft 50 and the input shaft 90 are eccentric to each other, and the protruding directions thereof are opposite to each other. Dimensionally, both shafts have the same diameter and the same size. Reference numerals 93, 94, 95 and 96 are bearings composed of pole bearings, and 97 and 98 are oil seals. Also, the input shaft 90
The output shaft 50 and the output shaft 50 mesh with each other at a predetermined gear ratio.
It is interlocked via 1,92. Furthermore, the gear case 9
Has an overall point-symmetrical shape, and the first block 9a on the input shaft side and the second block 9b on the output shaft side are connected by bolts 9
They are connected at c and 9d. Thus, assuming that the gear ratio of the gears 91 and 92 is X-fold speed, the speed can be reduced to 1 / X by reversing the mounting direction of the gear case 9.

With the above construction, while the rotation speed of the PTO shaft 20 is about several hundred rpm, the rotation speed of the output shaft 50 can be set to, for example, about 1000 rpm, and the blower 4b included in the power spreader is properly operated. In addition, the blower 4c can be driven independently of the traveling speed, and good fertilization can be performed.

In the above embodiment, the power spraying machine is used as the working machine 4, but other than that, a spraying machine of a chemical solution or the like can be used in exactly the same manner.

[0024]

As described above, according to the invention described in claim 1, when the clutch 6 is engaged, the output shaft 50 of the power transmission mechanism 5 receives the direct power from the engine 1 not through the transmission 2. Since it is transmitted, the work machine 4 has no relation to the traveling speed.
It becomes possible to take out the number of rotations that matches
Even if the power transmission mechanism 5 having such an additional configuration is provided, it does not give a passenger a feeling of harm or pressure, nor does it have a harmful effect such as involving a crop during traveling.

According to the second aspect of the present invention, the power take-out section 51 takes out the power of the engine 1 to the side of the power transmission section 52 disposed on one side in the width direction of the traveling machine body 3, and the clutch 6 is provided. The power transmission mechanism 5 has the structure in which the operating lever 61 is provided so as to face the operating end on one side in the width direction of the traveling machine body 3.
Can be favorably arranged below the passenger step 30 while avoiding the mission 2, and the clutch 6 can be appropriately operated.

According to the third aspect of the invention, the output shaft 50 of the power transmission mechanism 5 is utilized by utilizing the rear axle case 80.
Can be favorably supported.

According to the invention described in claim 4, the output shaft 50
The gear ratio of the pair of gears 91, 92 for interlocking with the input shaft 90 is appropriately selected, and the axial direction of the gear case 9 is changed to reverse the projecting directions of the output shaft 50 and the input shaft 90. By doing so, it is possible to easily change the number of rotations taken out to the output side.

[Brief description of drawings]

FIG. 1 is a plan view of a riding type lightweight tractor according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a perspective view of the clutch portion.

FIG. 5 is a sectional view of a gear case having the same output shaft.

FIG. 6 is a plan view of the gear case.

[Explanation of symbols]

1; engine, 2; mission, 3; traveling body, 30;
Passenger step, 4; work implement, 5; power transmission mechanism, 5
0; output shaft, 51; power take-out section, 52; power transmission section,
6; Clutch, 61; Operating lever, 62; Tension pulley, 80; Rear axle case, 9; Gear case, 9
0: Input shaft, 91, 92; Gear

Claims (4)

[Claims] 1. A riding type lightweight tractor in which a working machine (4) is provided behind a traveling machine body (3) including an engine (1) and a mission (2), and a passenger step (30) in the traveling machine body (3). ) Under the front axle case (70), the power take-out section (51) for taking out the power of the engine (1) from the front position of the mission (2), and the take-out section (51). A power transmission unit (52) that transmits the power to be taken out to the vicinity of the rear axle case (80) over the upper portion of the front axle case (70), and the power transmitted by this transmission unit (52) to the traveling machine body (3). ), A power transmission mechanism (5) having an output shaft (50) for outputting to the rear is provided, and the operation of the output shaft (50) in the power transmission mechanism (5) is clutched (6).
A light-duty tractor for riding, characterized in that it can be turned on and off by intermittent operation. 2. A power take-out section (51) takes out the power of the engine (1) to the side of a power transmission section (52) arranged on one side in the width direction of the traveling machine body (3), and the clutch (6). )
2. The riding-type lightweight tractor according to claim 1, further comprising an operating lever (61) which faces the operating end on one side in the width direction of the traveling machine body (3). 3. An output shaft (50) of the power transmission mechanism (5),
The riding type lightweight tractor according to claim 1 or 2, which is supported by a rear axle case (80). 4. An output shaft (50) of the power transmission mechanism (5),
This output shaft (50) and the input shaft (9
0) via a pair of gears (91, 92), and these output shaft (50) and input shaft (90)
5. The riding type lightweight tractor according to claim 1, 2 or 3, wherein the gears are supported by point-symmetrical gear cases (9) with their protruding directions reversed.