JPS59202909A - Supporting structure of front wheel of agricultural tractor - Google Patents

Abstract

PURPOSE:To make a height of an axle case above the ground high, by a method wherein an input bevel gear and a differential case are connected through a cylindrical shaft whose diameter is small and a center pin is made to position on the upper part of the cylindrical shaft. CONSTITUTION:An axle case 41 is supported rockably on a central bracket of a front frame fixed to an engine through a center pin 42, and a differential mechanism D obtained by connecting a driven bevel gear 43 and a differential case 44 arranged by putting them in two on both sides of the center pin 42 with each other by a cylindrical shaft 45 whose diameter is small is provided internally in the center of the axle case 41. The axle case 41 is made into a small diameter and installed at a high position, through which a height of the axle case 41 above the ground is made high as the differential mechanism D is separated into both sides, the bevel gear 43 and the differential case 44, and the center pin 42 is made to enter into between them.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small four-wheel drive agricultural tractor with an engine output of 7θ to 0 horsepower and a wheelbase of about /200 to /J00a+, while taking advantage of the characteristics of a small machine. The front wheel support structure has been improved to make it suitable for work in wet fields and field farming.

The development of agricultural tractors in Japan began with the development of single-pedestal cultivators for riding, and has continued to the present with the specifications of the tractors being set to accommodate rice cultivation, which is the mainstream of the Ik industry, and in particular the cultivation of paddy fields. In recent years, there has been a significant shift towards upland farming,
There is an increasing demand for a tractor that can handle the diversity of field crops. On the other hand, there is also a desire for the use of riding machines in plowing highly humid fields, where mechanization has been delayed.

To explain in more detail, 2 to 2 paddy fields where paddy rice and lotus roots are cultivated.
30% of the area is wet rice fields, and in order to propel the aircraft with less mud pushing in this wet rice field, it is necessary to have sufficient ground clearance, and the only thing that can satisfy it now is the large ffi! Limited to machines. However, large machines tend to sink into the plowing platform due to their large weight.
90% of the output power cannot be sufficiently maneuvered, and the aircraft cannot turn in a small radius, so a large headland is required, and this headland is also trampled, so it is difficult to use the backspring. Sometimes there were problems. Therefore, even in rice plowing, a tractor that is lightweight, compact, able to turn quickly, and has a high ground clearance is desired.

In addition, in field farming work, such as mulching work and managing and harvesting crops grown in rows, sufficient ground clearance is required to straddle the rows to avoid damaging the crops, and - to perform work in each row appropriately. It is desirable that the wheel tread be relatively small.

By the way, at present, small-sized tractors that can travel in a tight straddle over a narrow amount of iron have a low ground clearance and have a limited range of application, and high ridge work is performed exclusively by walking tailors. However, when working on high ridges using this tailor, the small tread is replaced with larger diameter wheels to increase the ground clearance, which increases the height of the machine, making it extremely unstable and requiring effort to maneuver. , and the fact that the work was done while walking made the trenches extremely hard work.

Therefore, there is a need for a tractor that has the characteristics of a small machine that is lightweight and has the ability to turn easily, yet has the ground clearance that allows it to mow high ridges, and that allows it to be used for field work in a riding-like manner.

One of the problems when increasing the ground clearance of a four-wheel drive agricultural tractor is the height of the axle case that houses the differential mechanism for driving the front wheels, and currently this axle case is attached to the front frame of the machine. There are two types of support. In other words,!
#, In order to make the front wheels follow the undulations of the field and stabilize the machine from side to side, the axle case for the front wheels is supported by the front frame so that it can roll freely, and one of the supports is The form is such that a center pin forming the rolling axis is provided at a position directly above the input shaft for driving the differential mechanism which protrudes rearward from the left and right center of the axle case.Other support forms include: The axis of the input shaft is a rolling axis.

The former is the most standard type and has been used more often since it has a simple structure and can be manufactured at low cost, and is still widely used in small models even today. Although this form has the advantage of being inexpensive to implement, it has the disadvantage that the ground clearance of the axle case is low because the input shaft is located below the center pin.

On the other hand, the latter shape has the advantage that the input shaft center coincides with the rolling shaft center, making it easier to increase the ground clearance of the axle case. but.

In this form, the support strength of the city axis case is considered.

It is necessary to form fulcrum points on the front and rear surfaces of the axle case, and the rear fulcrum in particular has a multi-shaft structure in order to input force from the rear, and the overall structure is complex, expensive, and relatively expensive. The reality is that this is only applied to large models.

The present invention provides a front wheel support structure that is effective in increasing the ground clearance of the axle case by 1.5 mm, while adopting the former form, which has a simple structure and can be manufactured at low cost.

The main feature of Taisho Mei is the Sho I for front wheel drive! 1
The axle case with the 1st mechanism inside is supported by the front frame for rolling oscillation via the front and rearward center pins, and the input shaft of the differential mechanism is placed below the center pin from the axle case. In a front wheel support structure of an agricultural tractor that projects rearward, an input bevel gear for driving a differential mechanism that engages with a bevel gear fixed to the inner end of the case of the input shaft, and a differential case are connected to a small diameter cylinder. They are connected via a shaft, and the center pin is positioned at the top of the cylindrical shaft.

In other words, the differential case and input bevel gear that make up the differential mechanism are separated to the left and right, and the two are connected by a small-diameter cylindrical shaft, and the entire differential mechanism is configured with a concave shape in the middle of the left and right, which corresponds to the concave area. A center pin is provided above the small diameter cylinder shaft.

Compared to conventional center bin usage, the center pin and the horizontal axis of the differential mechanism can be brought closer together, and as a result, the axle case can be mounted closer to the front frame, and the top can be raised higher. It became.

Also, since this configuration uses a center pin, it does not require a complicated fulcrum structure unlike the configuration that aligns the rolling axis with the input axis! ! l
! It is easy to manufacture, easy to use, and inexpensive, and is extremely advantageous for use in small models.

Embodiments of the present invention will be described below based on the drawings.

@1 Figure shows the overall side view of the agricultural tractor according to the present invention,
Around this time, the engine fl), main clutch housing (2), intermediate transmission 1# case (3), and transmission case (4) were connected in the front and rear rows 1a, and the engines were driven on both sides of the engine il+ and on both sides of the transmission case (4), respectively. The steering front axle +fil, +51 and the rear wheels t61, f61 are supported, and a driver's seat (7) is installed above the rear of the transmission case (4), and a hydraulic It is equipped with a lift arm (9) driven by a cylinder (8), and is equipped with a transmission case (4).
) A PTO shaft (lO) is protruded from the lower rear end.

The support of the front wheel (6) and the construction of body #1 are shown in Figure 8 and @Figure 4.

The axle case-1) is swingably supported via a center pin (42) on the central placket (40a) of the front frame i4Q fixed to the engine (1).
In the center of the receiver u1 bevel gear (4 (to) and the difference 1
The case (44) is arranged on the left and right sides of the center bin (42) and connected with a small-diameter sleeve sleeve (differential * 4!t).
CD) is included. In this way, by separating the differential mechanism (2) for forward transport into the left and right parts of the bevel gear and the differential part (44I), and inserting the center bin between them, the axle case (41) can be made with a small diameter. In addition, the input shaft (47) equipped with a bevel pinion (461) that engages with the bevel gear (c) is positioned at the rear. This input shaft ←η and the front wheel drive output shaft β installed at the bottom of the rear transmission case (4) are connected to a pole-engaging flexible joint (+48).
+481 and a transmission shaft (interlockingly connected via a barb).

At both left and right ends of the axle case (41), there are case nos.
), a steering vertical shaft (51) is supported, and this Kasuri shaft extension υ and the differential shaft (54) extended from the differential mechanism (40 force) are supported.
and are connected by bevel gears +531 and 1541.

A rotating case (6) is attached to the lower part of the end case (0) so as to be able to freely rotate around the vertical axis βυ axis, and a knuckle arm (64 is a steering link) connected to the upper end of the left and right rotating cases. It is linked to the control handle fight through a mechanism.

A reduction case split into two parts (inside and outside) is connected to the outside of this rotating case (6-yen), and a bevel gear 1 is supported on the top of the case.
59) is engaged with the bevel gear (61) provided at the lower end of the vertical shaft φυ, and the gear (6 (support) are interlocked with occlusion.

A front wheel (5) is disposed inside the cylinder shaft (61) at the outer end.
An axle (+64), which is flange-connected, is fitted with splines so that it can slide in and out, and the front wheel tread can be switched between large and small stages by moving the axle in and out. still,
The example axle is equipped with a lock pin ((to) that can freely move in and out of the radial direction and is biased to protrude outward, and the lock pin (6 points) is installed on the inner surface of the axle βυ at two locations in the axial direction. After the engagement recess i6Q is formed, the lock pin (65) engaged in the desired locking part (the lock pin (65)) is inserted into the lock pin (65) using the operating rod (67) pushed in from the end force of the axle (64). By supporting it so that it cannot be retracted, it is fixed in the axial direction to the axle (641 cylinder shaft (6υ).

By pulling out the operating rod (6η) and allowing the lock pin (center) to move in and out, it is possible to slide the axle β in and out.

Figure 5 shows the support and drive structure of the rear wheel (6).

There is an intermediate case f7 on the rear side of the mission case (4).
1) is connected and the mission case (4) is attached to its base.
A deceleration chamber (11) is formed that protrudes downward from the bottom surface. At the top of this reduction chamber q1) there is a tI''i differential mechanism■
) is penetrated by a differential shaft 172+ extending left and right from the differential shaft 172+, and at a position 10 below it is supported a medium-sized barrel driving shaft q-equipped which is interlocked for deceleration via gears (731, 1741).

Further, a differential shaft (72) is provided at the upper outer side of the reduction chamber (71).
It is equipped with a disc brake T7E9 that acts on the vehicle, and its operation arm (7η) is linked to the left and right brake pedals (Tamizu) installed in parallel on the right side step.

In addition, the outer end VC of the intermediate case (l70) is connected to the inner and outer parts of the deceleration case (inn), and the intermediate transmission sleeve (sode) elegantly pushed into this case (4) is connected to the outer end VC of the intermediate case (l70). 79) are interlocked via gears (bu) and (sυ).And within this sleeve.

An axle (8"4) to which a rear wheel (6) is flange-connected to the outer end is fitted with a spline so that it can slide in and out, and the rear wheel tread can be changed to 8 stages by moving the axle in and out. The locking structure of the axle 18 is similar to that of the front axle, and the lock pin (83) installed on the axle (114) is formed on the inner surface of the coax (79).
The four engaging parts (8 lamps) are selected and fixed using the operating rod (8 rods).

Note that (□□□) in FIG. 5 is a differential lock mechanism.

The agricultural tractor of the present invention is constructed as described above, and, as shown in FIG. 2, has a ground clearance (6) that allows easy work in soft, narrow, vertically furrowed fields.

[Brief explanation of drawings]

The drawings show an embodiment of the front wheel support structure for an agricultural tractor according to the present invention, with FIG. 1 being an overall side view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 8, and FIG. 5 is a longitudinal sectional rear view of the rear wheel support structure. (40)...Previous frame, +411...
・・Axle case, +42+・・・・Center bin, t
43) Input bevel gear, (input bevel gear)
Differential case, (451...Cylinder shaft. (46)...Bevel gear, t'+71...
...Input shaft, (2)...Difference U mechanism. Agent Patent attorney Osamu Kitamura Tokukai Sho 59-202909 (5) To 49-

Claims (1)

[Claims] An axle case f411 containing a differential mechanism [F] for driving the front wheels is supported on the front frame for rolling swing via a center pin G''; E) Input shaft - In the front wheel support structure of an agricultural tractor in which the center pin (42 is provided below and protrudes rearward from the axle case circle), the bevel gear is fixed to the inner end of the case of the input shaft 17). The input bevel gear for driving the differential wJ mechanism that engages the four wheels (four wheels and
The differential case (reflector) is connected via a small diameter cylindrical shaft (4-way
The front wheel support structure of an agricultural tractor is such that the center pin (4) is located at the upper part of the cylinder shaft.