JPH0446482Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention relates to a self-propelled tiller that plows farmland etc. while self-propelled. It is effective when used when installing a vertical adjustment device.

BACKGROUND TECHNOLOGY AND PROBLEMS Recently, self-propelled tillers, which mechanically perform the same work as hoe plowing continuously and efficiently, and are capable of plowing relatively deeply, have become popular.

For example, those having the basic structure as disclosed in Japanese Patent Application Laid-Open No. 56-82001, or
This type of plowing hoe is designed to penetrate into the soil using only the rotational force of the operating crank without hitting the plowing hoe.

This self-propelled tiller requires a link to be pivoted above the frame in order to cause the tillage hoe to move in an approximately elliptical direction in the vertical direction. , a single shaft was purposely prepared and supported by this.

As a result, the number of parts increases, and the parts cannot be constructed compactly.

Furthermore, as self-propelled tillers have become more widespread, their range of use has expanded from relatively wide, flat fields to narrow, steep slopes.

Therefore, in order to use self-propelled tillers on slopes, devices have been installed to adjust the posture of the machine by vertically displacing the left and right wheels separately, but this device also pivots the links. Because it is necessary to attach the parts near the
The overall size of the aircraft is also increasing.

Purpose of the invention Therefore, the present invention cleverly arranges and pivotally connects the link to a part of the vertical adjustment device for the left and right drive wheels in a self-propelled tiller, thereby making the part compact.
The aim is to contribute to the miniaturization of the entire aircraft.

Summary of the invention Therefore, in order to achieve the above object, the present invention has two gear cases that pivotally support an input shaft and an output shaft that are gear meshed, the output shaft protrudes only from one side of each gear case, and the input shaft is configured with a common shaft that passes through both gear cases, and the input shaft is rotatably supported on the frame, and a sprocket, etc. is fixed to the input shaft, so that it can be rotated by the engine mounted on the frame, and the output shaft is connected to the input shaft. are respectively equipped with wheels to serve as the right and left drive wheels of the machine body, and the input shaft shaft support portion of the gear case is made to protrude inward to form an inner boss, and the inner boss has a substantially elliptical shape in the vertical direction attached to the plowing hoe. The present invention is characterized by a link attachment structure in a plowing section of a self-propelled tiller, in which the base end of a link that causes movement is pivotally connected.

Example Next, the present invention can be applied without hitting a plowing hoe.
The illustrated embodiment will be described in which it is possible to penetrate the soil only by the rotational force of the operating crank.

1 indicates the main body of the self-propelled tiller, 1 is a frame of the main body a, and the front wheel 2 is rotatably supported at the lower front end 1a, the reducer 3 is mounted at the middle 1b, and the left and right drive wheels are mounted at the rear. 4a and 4b, and a control handle 5 is installed at the front of the upper part. Clutch levers 6, 7 and an accelerator lever 8 are attached to the outer grip portion 5a of the operating handle 5, and a tilt release lever 9 is attached to the inner grip portion 5b.

Further, although not shown in the drawings, the clutch levers 6 and 7 are provided with locks that can be fixed in the operating position when gripped, and the inclined locking lever 9 is attached to the inner grip portion 5.
Attach to b.

Reference numeral 10 denotes an engine mounted on the front part of the frame, and a belt 15 is stretched between the pulley 12 of the driving shaft 11 and the pulley 14 of the transmission input shaft 13 at the upper end of the reducer 3.

The reducer 3 is commercially available as a transmission with a side clutch, and the power transmitted from the transmission input shaft 13 is transferred to the left and right transmission output shafts 16, 17 at the lower end (in the drawing, the shafts 16, 1
7 coincides and only one appears, but the deceleration is transmitted independently to the clutch levers 6, 7 and wires 18, 19. A clutch built into the speed reducer, which is not equipped with a clutch, allows each gear to be turned on, off (Free), and off (Look) independently, and the speed change handle 20 can be used to change the speed to two forward speeds and two reverse speeds. has been done.

The rotation of the transmission output shaft 16 of the reducer 3 is transmitted to the input shaft of the gear case via a sprocket 21 and a chain 22.

The input shaft 23 has two gear cases 24a, 24
24a and 24b are respectively pivotally supported by the gear cases via bearings 25, and the center has a large diameter, and both ends are pivotally supported by the rear lower end 1c of the frame 1 with an axle box 26. The left and right gear cases 24a and 24b are independently movable up and down with respect to the frame 1.

A sprocket 27 is fixed to one end of the input shaft 23 to take over the rotation of the transmission output shaft 16 of the reduction gear 3 described above.

The gear cases 24a and 24b are cases in which the gear cases 24a and 24b are approximately in the shape of a canopy, and have an inner boss 24' protruding inward from the shaft support of the input shaft 23, and a gear 28 formed directly on the input shaft 23 therein. An output shaft 30 that houses the gear 29 to be meshed and fixes the gear 29.
a, 30b are pivoted so as to protrude from only one side of each gear case 24a, 24b without penetrating each gear case 24a, 24b.

A horizontal rod 31 is pivotally attached to the front ends of the gear cases 24a and 24b, respectively.
The lower ends of the connecting rods 32a, 32b are pivotally connected to the .

33 is the gear case 24a, 2 of the frame 1
4b, a plurality of locking holes 34, 34, 34, . ,
The center of the interlocking rod 36 is pivotally mounted 37 at the lower center thereof.

The interlocking rod 36 has its center pivoted to the locking plate 33.
7, and its central portion projects upward to form a pin mounting portion 38, and the pin mounting portion 38
In this case, the locking pin 39 is attached to the locking hole 34 of the locking piece 35 so that it can be freely engaged and disengaged, that is, the locking pin 39 is always pressed against the locking piece 35 by a spring. Locking pin 39
and the tilt release lever 9 are connected by a wire 40.

Further, the upper ends of the connecting rods 32a, 32b are pivotally connected to the left and right ends 36a, 36b of the interlocking rod 36, respectively, thereby forming an inclined locking mechanism b that is related to the left and right gear cases 24a, 24b.

41 is an operating crank supported on the rear part 1d of the frame 1, and there is a sprocket 43 fixed to one crankshaft 42 and a sprocket 44 fixed to the other shaft 17 of the transmission output shaft of the reducer 3. Pass the chain 45.

Reference numeral 46 denotes a link whose base end is pivotally attached at the center of the inner bosses 24', 24' protruding from the gear cases 24a, 24b, and a lower piece 47 is pivotally attached to the tip of the link so as to hold the link.

Note that since the inner boss 24' and the link 46 are in direct contact, the inner boss 24' is made of cast metal and the link 46 is
The base end shall be made of steel.

In addition, the lower piece 47, the left and right operating cranks 41,
The upper and lower ends of the elevating rod 49 are respectively fixed between the upper piece 48 which is pivotally connected between the elevating rod 41 and the upper piece 48 .

That is, although it is not shown in the drawing, between the upper piece 48 and the lower piece 47, part of the upper and lower ends of the round bar-shaped lifting rods 49, 49 are fitted and fixed in two side-by-side manner, so that the lifting rods 49, 49 A mounting base 50 having a cylindrical shape with a figure 8 cross section is loosely fitted into the mounting base 50 so as to be movable up and down, and a buffer coil spring 51 and vibration absorbing urethane 52 are loosely fitted above and below the mounting base 50.

A plurality of mounting holes 50a are formed in the vertical direction on the rear surface of the mounting base 50, and a hoe mounting base 53 whose vertical position is adjusted depending on the selection of the mounting holes is provided in the holes 50a.
Tighten the bolts.

Reference numeral 54 denotes a plowing hoe, which has a mounting rod 55 with a hole protruding from its top, the lower part of which is branched into three hoe tips 56, and the mounting rod 55 is formed on the lower side of the hoe mounting base 53. It is inserted through the cylindrical hole, and the mounting pin 57 is inserted and mounted by aligning the holes with each other.

Note that 58 is a weight boss that serves as a boss and weight for mounting the wheels 4' of the left and right drive wheels 4a, 4b to the output shafts 30a, 30b.

Operation: First, after putting the machine into the field to be plowed and starting the engine 10, for example, if the clutch lever 6 for traveling disposed on the left side is released from its gripped and locked state, the machine will be connected to it. The wire 18 loosens, and the running clutch (not shown) in the reducer 3 changes from the disconnected state to the on state, and the rotation of the driving shaft 11 of the engine 10 is controlled by the pulley 12, the belt 15, and the reducer 3. Pulley 14 of the mission input shaft 13, sprocket 2 of the mission output shaft 16
1. The power is transmitted through the chain 22 and sprocket 27 to the input shaft 23 of the gear cases 24a and 24b, and within the gear case, the power is transmitted to the left and right drive wheels 4a and 4b mounted on the output shafts 30a and 30b through the gears 28 and 29. , and the aircraft begins to travel in the direction of the arrow in Figure 1.

At this time, if the tillage clutch lever 7 located on the right side is also released from the gripped and locked state, the wire 19 connected to it is relaxed and the tillage clutch (not shown) in the reducer 3 is also engaged. The rotation of the driving shaft 11 of the engine 10 is transmitted to the pulley 12, the belt 15, the pulley 14 of the transmission input shaft 13 of the reducer 3, the sprocket 44, the chain 45, and the sprocket 43 of the transmission output shaft 17. The working crank 41 begins to rotate.

When the operating crank 41 rotates, the elevating rod 49 to which the plowing hoe 54 is attached integrally rotates back and forth about the pivot point of the lower piece 47 as a fulcrum, and the gear case 24a, which also serves as the support shaft of the link 46, rotates. ,2
It moves up and down around the inner boss 24' of 4b,
The hoe tip 56 of the tillage hoe 54 penetrates into the soil while making a substantially elliptical movement in the vertical direction.

At the same time, as the operating crank 41 rotates upward, the tilling hoe 54 also moves upward, and the hoe tip 56 digs up the soil mass behind the position it has just entered so as to reverse the tilling process.

While causing the crank and the hoe to move in this manner, the operator uses the control handle 5, usually its outer grip 5, to control the rocking of the machine due to the reaction during the reversal of plowing.
Holding a firmly with both hands, move the left and right drive wheels 4a,
By moving backward according to the rotational speed of 4b, the field can be plowed continuously and with the same characteristics as conventional hoe plowing.

At this time, the link 46 is attached to the gear cases 24 on both sides.
It is located at the center of each inner boss 24' of a and 24b, and is pivotally connected to both inner bosses 24'.
In other words, although a dedicated shaft for pivotally connecting the link 46 to the frame 1 is not prepared, the shaft box 26,
Input shaft 23, bearings 25, 25, gear case 24
A and 24b are supported sequentially and, as a result, are pivotally attached to the frame, so this part can be configured very compactly.

Furthermore, since the input shaft 23 supports the weight of the machine, it is originally made thick and strong, so there is no need to worry about the strength of the portion to which the link 46 is pivotally attached.

In order to tilt the aircraft, grasp the tilt release lever 9 attached to the control handle 5,
Pull the locking pin 39 connected to the tip of the wire 40 against the tension of the spring, and remove the locking pin 39.
This can be done by disengaging the locking hole 34 on the locking piece 35 and at the same time pushing the steering handle 5 to the left or right to twist in the desired direction.

Effects of the invention The link attachment structure in the plowing section of the self-propelled tiller of the invention has two gear cases that pivotally support an input shaft and an output shaft that are meshed with gears, with the output shaft protruding only from one side of each gear case. The input shaft has a common shaft that passes through both gear cases, and the input shaft is rotatably supported on the frame, and a sprocket or the like is fixed to the input shaft so that it can be rotated by the engine mounted on the frame. , wheels are attached to each of the output shafts to serve as the right and left drive wheels of the machine, and the input shaft support portion of the gear case is made to protrude inward to form an inner boss, and the inner boss has upper and lower wheels attached to the plowing hoe. Since the base end of the link that causes approximately elliptical movement in the vertical direction is pivotally connected, the link that causes the plowing hoe to generate approximately elliptical movement in the vertical direction can be used as part of the vertical adjustment device for the left and right drive wheels in a self-propelled tiller. can be skillfully arranged and pivoted, and this part can be constructed compactly, contributing to miniaturization of the entire machine.

[Brief explanation of the drawing]

FIG. 1 is a left side view showing the entire self-propelled tiller to which the link attachment structure of the present invention is applied, FIG. 2 is a sectional view of the main parts, and FIG. 3 is a perspective view of the main parts seen from the rear. a... Self-propelled tiller main body, b... Inclination locking mechanism,
1...Frame, 4a...Left drive wheel, 4b...Right drive wheel, 10...Engine, 23...Input shaft, 2
4a, 24b...gear case, 24'...inner boss, 30a, 30b...output shaft, 41...operating crank, 46...link, 54...plowing hoe.

Claims (1)

[Scope of utility model registration request] 2 that pivotally supports the input shaft and output shaft that are engaged with gears.
Two gear cases are constructed, with the output shaft protruding only from one side of each gear case, and the input shaft having a common shaft that passes through both gear cases.The input shaft is supported on a frame, and a sprocket, etc. The engine is fixedly attached to the frame and rotatably connected, and a wheel is attached to each output shaft to serve as the right and left drive wheels of the aircraft, and the input shaft support part of the gear case is made to protrude inward. A link attachment structure in a plowing part of a self-propelled tiller, which has an inner boss, and a base end of a link that causes a plowing hoe to move approximately elliptical in the vertical direction is pivotally attached to the inner boss.