JP2003088202A - Walking type tilling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent exhaust gas discharged from a muffler from coming into contact with an operator at the rear and to make the top of a fender covering the upper side of a tilling part not be burned by exhaust heat in a walking type tilling apparatus loaded with a general-purpose vertical engine on the top of a transmission case. SOLUTION: In this walking type tilling apparatus in which the transmission case 3 is installed at the lower part of the vertical engine 2, a tilling shaft 13 is pivotally mounted horizontally sideways at the lower part of the transmission case 3, the tilling shaft 13 is furnished with a plurality of tilling tines 18 and the upper part of the tilling tines is covered with the fender 70, a fuel tank 65 is arranged at the front of the engine 2, an air cleaner 64 is laid at either right or left side of the body the engine 2, the muffler 60 is installed at the other side, the exhaust vent of the muffler 60 is arranged downward and a guide 72 which receives exhaust gas and guides the exhaust gas sideways is mounted on the fender 70 below the exhaust vent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type tiller having a vertical engine.

[0002]

2. Description of the Related Art A vertical engine having an output shaft extending in the vertical direction is provided at an upper part of a transmission case, and power is transmitted from a lower part of the transmission case to a horizontally cultivated cultivating shaft, which is mounted on the cultivating shaft. There is known a so-called axle tiller which tills soil with a tilling claw.

In such an axle cultivator, a fuel tank, an air cleaner, and a muffler are generally arranged around the central engine.

[0004]

By the way, when constructing such an axle cultivating device, it is desirable to use a versatile engine for constructing at low cost. For example, an engine used in a brush cutter or the like has an air cleaner attached to one side in the left-right direction, an exhaust muffler attached to the other side in the left-right direction, and a fuel tank may be attached to the front-rear side avoiding these. Many.

Since the exhaust port of this type of exhaust muffler is provided along the longitudinal direction of the engine output shaft,
If the engine for the brush cutter is mounted as it is on the axle cultivator as a vertical engine, high temperature exhaust gas may be directly ejected onto the upper surface of the fender that covers the upper part of the cultivator shaft, and the fender may be burned.

[0006]

The present invention has been proposed in view of the above-mentioned problems, and therefore, the following technical means have been taken. That is, according to the first aspect of the invention, the transmission case 3 is provided in the lower portion of the vertical engine 2, and the cultivating shaft 13 is provided horizontally in the lower portion of the transmission case 3 horizontally. In the walk-type tiller in which the tiller claws 18 ... Are attached and the upper portion thereof is covered with the fender 70, a fuel tank 65 is provided in front of the engine 2.
The air cleaner 6 is installed on the left and right sides of the engine 2 body.
4, a muffler 60 is provided on the other side of the left and right, an exhaust port of the muffler 60 is formed downward, and a guide for laterally receiving exhaust gas on the fender 70 below the exhaust port and guiding the exhaust gas sideways. A walk-type tiller equipped with 72 is provided.

In the invention of claim 2, the guide 72 is provided.
The walk-type tiller according to claim 1, wherein the box-shaped tiller has a box shape, and only the upper side and the lateral outer side are opened. In such a configuration, when the engine 2 is started, the exhaust gas is discharged downward, is received by the guide 72 attached to the upper surface of the fender 70, and is further discharged outward in the left-right direction.

Therefore, the fender 70 is not burned by high-temperature heat and hot air is not blown to the operator at the rear of the machine body, which does not hinder the tilling work.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments shown in the drawings. First of all, from the configuration, 1 is a walking type mobile agricultural machine, which has a vertical engine 2 in the center of the machine body, and the engine 2 is provided above a transmission case 3 that houses a transmission gear and the like described later. It is attached via a plurality of bolts 4 and 4. (The engine of this embodiment uses the engine of the brush cutter as it is.) The transmission case 3 is constructed by combining two half case bodies 3a, 3a from the left and right, and the output transmission of the engine 2 is performed. The shaft 5 is inserted and supported in the vertical direction (vertical direction), and a shaft 7 with a worm gear 6 is screwed to the lower portion of the output transmission shaft 5. Since the output transmission shaft 5 and the shaft 7 are separated in this way, machining of each shaft becomes easy. The output transmission shaft 5 and the shaft 7 are integrally supported by a bearing 8 and a bush 9. Further, a worm wheel 11 is incorporated in the transmission case 3 and meshes with the worm gear 6 to transmit the rotational power on the engine 2 side to the worm wheel 11.

In FIG. 2, reference numeral 12 is a clutch drum, which is constructed integrally with the output transmission shaft 5, and the centrifugal clutch on the engine 2 side acts on this clutch drum 12 to output the rotational power of the engine 2. It is transmitted to the transmission shaft 5 side. A through hole 15 for inserting the axle 13 is formed at the center of the worm wheel 11, and the axle 13 and the worm wheel 11 are configured to rotate integrally via a key 16.
Both ends of the axle 13 project from the transmission case 3, and a tubular boss 20 having a plowing pawl 18 attached thereto is fitted from the outside, and the tubular boss 20 is attached to the axle 13 by a removable pin 21.
Fixed to. Therefore, the axle 13 has a through hole 23 through which the pin 21 can be inserted. The tiller 18 has a plate body 24 fixed to a cylindrical boss 20 and a bolt / nut 25,
It is fixed detachably at 26. The tilling claw 18 can be changed inward and outward and its mounting posture can be changed depending on the work content and purpose.

In the figure, reference numeral 27 is a hair pin for preventing the pin 21 from coming off, 28 is an oil supply port formed in the transmission case 3, and 30 is an oil supply plug. Next, another configuration of the walk-behind mobile agricultural machine will be described with reference to FIG. A machine frame 31 is detachably attached to two upper and lower portions of the rear portion of the transmission case 3 via fastening tools 32 such as bolts and nuts.
A tail wheel 33 and a resistance rod 35 are supported by 1. The machine frame 31 is formed by bending a sheet metal frame, and is provided with a proper gap portion 36 in the left-right direction, and a lower portion of a handle column 37 made of a round pipe is fixed to the gap portion 36. The tail wheel 33 is attached to the lower end of an arm 39 which is bent in a U-shape when the lower half is widened to the left and right when viewed from the back, and the arm 39 can be rotated back and forth about a fulcrum pin 40. The through hole 42 formed in 1) is aligned with one of the three through holes 43 formed in the machine frame 31, and a pin (not shown) is inserted from the side to adjust the height of the tail wheel 33.

A plurality of semicircular cutout grooves 44 are provided on the front side of the resistance rod 35, and the engagement groove 44 of the resistance rod 35 is engaged with the pin 45 provided on the machine frame 31. Stop it,
A spring 46 urges the resistance rod 35 forward.
One end of a spring 46 having an intermediate portion wound around a pin 45 is engaged with a hole 48 formed in the machine frame 31, and the other end of the spring 46 is engaged with an upper rear surface of the resistance rod 35. Therefore, the back surface middle portion (A) of the resistance rod 35 is always in contact with the lower portion of the rear end of the machine frame 31, and this state is always maintained during the work.

When the height of the resistance rod 35 is changed, the upper portion of the resistance rod 35 is grasped and tightened, and the pin 45 and the engagement groove 44 are disengaged by being pushed backward while resisting the urging force of the spring 46. Pull this up or down. Further, the handle strut 37 is vertically divided into two parts, the upper strut 37a is separable from the lower strut 37b, and can swing back and forth around the fulcrum pin 49. The upper strut 37a has a bifurcated upper portion and is formed in a Y shape when viewed from above. Two side plates 50 are fixed to the lower portion of the upper strut 37a.
A circular arc-shaped long hole 51 is formed in the hole, and when the upper column 37a is rotated around the fulcrum pin 49, the long hole 5 is formed.
The handle mounting angle can be changed and adjusted within the range of 1.

Since the fulcrum pin 49 can be pulled out laterally, when the walking type mobile agricultural machine is packaged and carried, the upper column 37a can be removed to be compactly housed in a wooden box. Although not shown, a locking knob is attached to the outside of the screw rod 52 loosely fitted in the long hole 51, and the knob is turned to rotate the lower pillar 37b and the upper pillar 3.
7a is fixed. Further, a handle 54 for transporting the mobile agricultural machine, which is extended forward, is provided on the upper part of the lower support 37b, and the handle 54 is held to carry the walk-behind mobile agricultural machine 1. A clutch operating lever 55 for turning on and off the centrifugal clutch of the engine 2 is provided on one of the left and right sides of the handle grip portion of the upper strut 37a, and the clutch is engaged only when the clutch operating lever 55 is gripped to rotate the engine 2. Is transmitted to the side of the axle 13 which is a cultivating shaft.

Next, a mounting structure of auxiliary devices around the vertical engine 2 will be described. A muffler 60 is provided on the left side of the engine 2 in the traveling direction, and a muffler cover 61 is attached to the outside thereof. The exhaust pipe 62 of the muffler 60 extends in the vertical direction, and the lower end thereof is cut off at an angle of 45 degrees so that the exhaust port 62a faces laterally outward.

On the other hand, an air cleaner 64 is attached to the right side of the engine 2, and a fuel tank 65 is attached to the front part of the engine 2. Reference numeral 66 is a fuel filler port, and 67 is a cover that covers the outside of the fuel tank 65.
A recoil starter 69 for starting the engine 2 is provided in the center of the engine 2, and the knob 69a of the recoil starter 69 is pulled backward to start the engine 2.

A fender 70 is provided between the engine 2 and the cultivating portion of the axle 13 so that soil and stones will not be applied to the operator during the plowing work. The fender 70 is composed of two front and rear sheet metals 70a and 70b, and is fixed to the engine 2 with bolts or the like sandwiching the upper portion of the transmission case 3 from the front and rear.

A box-shaped guide 72 made of steel is fixed to the upper surface of the fender 70 and is opened laterally and laterally outward. The guide 72 is constructed so as to face below the exhaust pipe 62 of the muffler 60. is doing. Therefore, the exhaust gas discharged from the exhaust pipe 62 of the muffler 60 is discharged downward at one end, and then the front and rear walls of the guide 72 and the inner wall 72 of the guide 72 are discharged.
It is received by a, 72b, and 72c, and is discharged toward the lateral outside.

The front portion of the fender 70 has a plan view U.
The letter-shaped bumper 73 is fixed, and the walking type mobile agricultural machine body comes into contact with trees and concrete ridges during the work, and the engine 2
And the accessories are not damaged. In FIG. 1, reference numeral 74 is an ON / OFF switch of the engine 2,
It is attached to the branch intersection of the upper column 37a. When starting the engine 2, the switch 74 is turned to the ON position to pull the knob 69a of the recoil starter 69, and when the engine 2 is stopped at the end of the work, the switch 74 is turned to the OFF position.

Next, the operation of the above example will be described. When the engine 2 is started to perform plowing work, the tail wheel 33 is retracted upward and fixed, the resistance rod 35 is lowered, and further ON.
-Set the OFF switch 74 to the ON position. In this state, pull the recoil starter 69 backward and pull the engine 2
Is started and the clutch operating lever 55 is gripped.

Then, the rotational power of the engine 2 rotates the centrifugal clutch, the output transmission shaft 5 and the shaft 7, and the worm gear 6,
Axle 13 which is a tilling shaft through the worm wheel 11 in sequence
To rotate. When the axle 13 is rotated, the tilling claw 18 attached to the plate body 24 integrated with the tubular boss 20 is rotated to till the soil. The working depth is adjusted by adjusting the force applied to the resistance rod 35.

Since the plowing claw 18 in this embodiment is mounted on the plate 24 integral with the tubular boss 20 so that the mounting direction can be changed, the plowing claw 18 can be freely and easily replaced according to the purpose and contents of the work. It is possible. Exhaust gas is discharged downward from the tip of the exhaust pipe 62 of the muffler 60 during the work. In this embodiment, the exhaust gas is exhausted because the fender 70 is fixed to the guide 72 that is open to the upper side and the left side. Since the upper surface of the fender 70 is not directly contacted with the thin fender 70, the upper surface of the fender 70 is not burned, and the exhaust gas is guided by the guide 72 made of steel.
Then, the gas is discharged to the lateral outside immediately after it is received by, and the problem that the gas is sprinkled on the worker behind does not occur. If the guide 72 is fixed to a bolt or the like, it can be easily replaced even if the guide 72 is deteriorated and damaged.

Further, in this embodiment, the air cleaner 64
Is installed on the right side, which is the opposite side to the muffler 60 in the left-right direction, so that hot air of exhaust gas or dirty air is not sucked in, leading to a decrease in operating efficiency of the engine 2 and impairing the durability of the filtering member. There is no.

Further, a fuel tank 6 is provided at the front of the engine 2.
5 is provided, and the refueling port 66 is configured in an obliquely upward posture, so that the fuel refueling operation is easy. Moreover, since the fuel tank 65 itself is covered with the tank cover 67, the fuel tank 65 withstands damage and deformation, and the rigidity is improved. Further, in this embodiment, the bumper 7 is provided on the front part of the fender 70.
3 is provided and the front portion of the fuel tank 65 is protected by the bumper 73, there is no possibility of damaging the fuel tank 65 during the work.

In the above embodiment, the handle support 37
Although it is constituted by a round pipe, it may be formed by a square pipe as shown in FIG. 7 and the carrying handle 54 may be welded thereto. When the carrying handle 54 is welded to the round pipe, a step of crushing the round pipe to secure the flatness may be required, which may increase the cost, but the use of the square pipe eliminates such a problem. It is what is done.

[0026]

Since the present invention is constructed as described above,
It has the following technical effects. That is, in the invention of claim 1, the transmission case 3 is provided in the lower portion of the vertical engine 2, and the cultivating shaft 13 is provided horizontally in the lower portion of the transmission case 3 horizontally. In the walking type cultivating device in which the plowing claws 18 of ... are attached and the upper side thereof is covered with the fender 70, a fuel tank 65 is provided in the front part of the engine 2, and an air cleaner 64 is provided on one side of the engine 2 main body. A muffler 60 is provided on the other side of the left and right, an exhaust port of the muffler 60 is formed downward, and a guide 72 for receiving exhaust gas and guiding the exhaust gas sideways is provided on a fender 70 below the exhaust port. Because it is a thing,
There is no risk that the upper surface of the fender 70 will be burnt by the hot air of the exhaust gas, and the exhaust gas will be guided laterally, so that this gas will not be applied to the worker, so that the worker can work comfortably. .

According to the second aspect of the present invention, since the guide 72 has a box shape and only the upper and lateral outer sides are opened, the overall structure of the guide is simple and inexpensive.

[Brief description of drawings]

FIG. 1 is an overall side view of a walk-behind mobile agricultural machine.

FIG. 2 is a front sectional view of a main part.

FIG. 3 is a side sectional view of a main part.

FIG. 4 is a plan view of the engine.

FIG. 5 is a plan view of a fender.

FIG. 6 is a plan view of a tail wheel portion.

FIG. 7 is a plan view of a main part with a part cut away.

[Explanation of symbols]

1 walking type mobile agricultural machine 2 engine 3 transmission cases 5 output shafts 6 Worm gear 7 axes 11 warm wheels 12 clutch drum 13 axles 60 muffler 64 air cleaner 65 fuel tank 70 fender 72 Guide 73 bumper

Claims (2)

[Claims] 1. A transmission case 3 is provided at a lower portion of a vertical engine 2, and a horizontal cultivating shaft 13 is horizontally provided at a lower portion of the transmission case 3.
A plurality of tillage claws 1 are attached to the tiller shaft 13 by mounting the
8 is attached and the upper part thereof is covered with a fender 70. In the walking type tiller, a fuel tank 65 is provided in the front part of the engine 2, an air cleaner 64 is provided on one side of the engine 2 body, and the other side of the engine 2 is provided. A muffler 60 is provided on the vehicle, and an exhaust port of the muffler 60 is formed downward, and a guide 72 for receiving the exhaust gas and guiding the exhaust gas sideways is provided on the fender 70 below the exhaust port. A walking type tiller. 2. The guide 72 has a box shape, and is open only on the upper side and the lateral outer side.
The walk-type tiller described.