JPS60131323A - Four wheel drive farm tractor - Google Patents

Abstract

PURPOSE:To make it possible to perform the four wheel drive of a tractor without being made into contact with a front wheel drive axle even if a mid-mount mower is raised, by making the axis of the pinion shaft of a front differential gear casing vertically eccentric from the axis of the front wheel drive axle. CONSTITUTION:A mission casing 16, a front drive axle 25 and a front differential gear casing 19 are all eccentric rightward from the lateral center line O1-O2 of a farm tractor. A discharger 14a section which is projected part of a mower 14 is laid leftward for balancing. The mower 14 has three rotary blades 14a, 14b, 14c which are rotated so that mowed brushwood is directed to the discharger 14a from which the mowed brushwood is thrown away. This discharger 14 is extended leftward by a long length for balancing.

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to the structure of a small tractor among four-wheel drive tractors, which is equipped with a mid-mount mower on its abdomen for mowing lawns. .

(b) Prior art There have been machines called mower tractors that are equipped with a mid-mount mower and used for mowing lawns, but tractors that have a mower attached to the abdomen for mowing or mowing the lawn have existed. If the mower were made to be able to move up and down, the upper part of the mower would come into contact with the space where the front wheel drive shaft is connected from the transmission case to the front differential case, making it impossible to do so. However, mowing lawns was often done on slopes, and a running device with stable gravitational force and good pitching performance was desired.

(C) Purpose of the Invention The present invention makes it possible to install a mid-mount mower and also to enable front wheel drive by eccentrically disposing the front wheel drive shaft, not only eccentrically from side to side but also vertically. Then, place the front wheel w in a position where it will not engage even if the mower is rotated upward.
It has JIl+III arranged.

Furthermore, if the front wheel drive shaft, transmission case, front differential case, etc. are arranged eccentrically, the center of gravity of the small agricultural tractor will be biased in the left-right balance, resulting in a lack of stability on slopes.

Therefore, in the present invention, the discharger that protrudes laterally from the mid-mounted mower is arranged on the opposite side to achieve a high performance.

B) Structure of the Invention The purpose of the present invention is as described above.The detailed structure of the present invention will be explained based on the structure of the embodiment shown in the drawings in Appendix A.

Figure 1 is a side view of a small agricultural tractor with a rotary mower attached to its abdomen. FIG. 3 is a plan view of the front wheel g-drive device. FIG. 4 is also a front sectional view.

The overall configuration will be explained with reference to FIG.

The engine (I) is inside the hood (II) of the agricultural tractor.
3) is arranged, and a muffler (surface, air cleaner 69) is arranged in front of the engine t131. or,
The front PTO clutch (■η
are installed in succession.

The front PTO clutch surface consists of an electromagnetic clutch, which can be turned on with a switch at the operator's hand.
o ff can be done. A V-belt is wound between the front PTO clutch Uη and the front PTO pulley 1111 to transmit power. The shaft of the PTO gooley-08+ (43) passes through the center pin and projects to the rear of the front axle case 4191, and the universal joint 162+7
! : Interlocking 11i111 (Power is transmitted to the input gear box ■ of the rotary mower U (a) via 151).

U41 is a rotary mower, and is configured so that it can be moved up and down between a working state and a non-working state using a lift lever near the operator. However, when the input gear box (□□□) that protrudes upward moves upward, the front wheel drive shaft +
2! If it interferes with 51, it will not be possible to raise it any further, so the hydraulic transmission case 161 and the front differential case (1
The front wheel drive shaft, which transmits power to 9d), is eccentrically placed on the right side in the direction of travel, and is placed in a convenient position.

u2 is the front wheel.

As shown in FIGS. 3 and 4, the front differential case (
19d) side input shaft (21 is equipped with a transmission case rigid,
The position is raised upwards.

A safety cover (40) is fitted over the front wheel ame+s and the input shaft Qll. A gear t3'/) is provided inside the gearbox 0. A gear (2) is fixed to the pinion shaft, and the pinion (36a) meshes with a ring gear group of the front differential device 4.

A front differential gear (221) is loosely fitted into a differential pinion (the fifth gear is a differential pinion shaft 151), and differential rotation is transmitted to the differential side gear.
The front axle shaft □□□ is spline-fitted to the differential side gear (53L), and the front axle shaft (to) is spline-fitted to the differential side gear (53R). The front differential case (19tl) and the left front axle case are integrally formed, and are integrally molded by casting at the upper side of the center to provide a hole (19b) for inserting a center pin. As shown in FIG. 2, this insertion hole (19b) is elongated toward the front, spanning the length between the front center pin bracket and the rear center pin plug f45+.

Then, the front axle case Uω and the insertion hole (1c+
A partition wall (19a) is formed at the intersection of the two parts to prevent the lubricating oil in the front axle case 119) from entering the fitting hole (19b).

The center pin is composed of a cylindrical shaft, and the center pin is
The shaft +431 of the front PTO pulley is supported inside and protrudes rearward. A universal joint (6) is provided at the rear end of this shaft (4 to 6) to drive the rotary mower gear box of the rotary mower α via the intermediate shaft U9.

- is an oil rod ◇A fixed case is fixed to the left end of the front axle case U wing, and a rotating case 1311 is pivotally supported to this fixed case via a large diameter oil seal and bearing. There is. Then, the upper surface of the rotating case 1311 on the front wheel u21 side and the upper surface of the fixed case □□□
A reinforcing plate (3) of a knuckle arm (aoa) serving as a dustproof wall and a reinforcing wall is spanned between the two a) and supports the rotating case D from above and below.

The bevel gear (to) at the left end of the front axle shaft (2) meshes with the bevel gear M/) at the upper end of the kingpin shaft (to),
The bevel gear (2) at the lower end of the king pin shaft □□□ meshes with the bevel gear (□□□) on the axle shaft.

The central part of the kingpin shaft is supported by only the bearing of the fixed case. The axle (2) is supported by a bearing on the outer lid body 134+ of the rotating case group.

In addition, since the lower end of the kingpin shaft (to) is not supported by a bearing in the rotating case 1311, there is a margin for the extension of the kingpin shaft, and a recess (a) is formed inside the rotating case.
Xa) is provided to reduce the amount of lubricating oil and to increase the ground clearance.

Next, let me explain the right side of the front differential case (19d).

The right side also serves as the lid of the front differential case (19d) to constitute a front gear case, and (7) a 70-point gear case is extended to form a fixed case (support). Therefore, the lid of the front differential case (19d), the front axle case, and the fixed case are all integrated into the fixed case (2).

The same parts as the left side are used for the rotating case, reinforcing plate (30), etc.

In addition, the knuckle arm (30a) extending from the reinforcing plate () is connected to the tie rod (46L) (46n), and when the bell crank arm (4η) is pulled from the drag rod, the tie rod (46L) (46R) The knuckle arm (aOa) is pulled through the steering wheel to perform steering.

FIG. 2 is a plan view showing the overall arrangement of the agricultural tractor of the present invention.

With respect to the left and right center 1dol-02 of the agricultural tractor, both the transmission case 0ω, the front wheel drive shaft), and the front differential case (19d) are eccentric to the right.

This has a large effect on the weight balance of small agricultural tractors, and the center of gravity inevitably shifts to the right side.

In the present invention, in order to compensate for this point, the discharger (14a) portion, which is located at the peak of the mower U slope, is placed on the left side to maintain balance. More aa is three days - tally wings 4jJ (14b) (14c) (14d
)' in the opposite direction so that the cut grass is directed toward the discharger (14a).

The mowed grass is thrown out from the late K discharger (14a). This discharger was lengthened and relocated to the left side to maintain balance.

FIG. 5 is a side sectional view of the deceleration case (391 part).

Immediately after coming out of the mission case (161) there is a joint (421 hole, and input shaft t21) and the front wheel drive shaft d.
A nimo point (41) is provided between the + and It absorbs changes in the intersection angle of the and axes. □
A rubber cover is also interposed on the i-full cover (40) to absorb vertical movement.

FIG. 6 is a side sectional view showing a state in which the first order 4J of the front PTO boo'J-tllll is supported by a bearing inside the center pin.

Figure 7 shows the structure of the deceleration case (support), and since the mounting bolt positions are divided into four equal parts, the positions of the front wheel drive shaft and input shaft can be completely changed by changing the mounting position. □ (e) Function of the invention Since the present invention is configured as described above, the front wheel drive shaft (c)
is passing on the right side of the abdomen of the tractor, so mower 1
Even if the inlet bevel gear box 41 moves upwards, it does not come into contact with this front wheel MX drive shaft and can be raised freely. In addition, since the front wheel drive shaft 2) is vertically offset from the pinion shaft of the front differential device, it is also placed upward in this respect, allowing more room for the vertical movement of the mower.

Also, by setting the direction of grass discharge from the mower (141) opposite to the eccentric direction of this front differential case, it is possible to balance the left and right sides by moving the mower discharger in the opposite direction. It can be done.

,'(f) Effects of the Invention As described above, the present invention repositions the front differential case eccentrically to the left and right on the front axle case, and also moves the axial center of the pinion shaft of the front differential case and the axial center of the front wheel drive shaft vertically. Because it is eccentric, even when the mid-mount mower is raised, it does not shift all the way to the front wheel drive shaft, making it possible to improve the 4i+ of a tractor with a mid-mount mower, which was previously not possible.
'a drive became possible.

Furthermore, the positions of the front wheel drive shaft and the input shaft relative to the pinion qqn can also be changed by completely changing the mounting upright in the case of increasing or decelerating the speed.

Furthermore, by changing the speed ratio of the reduction case to the speed increase case, the reduction ratio of the transmission case can be changed to make it more compact.

In addition, the mid-mount mower's discharger is placed on the opposite side of the front differential case, so it is possible to restore the left-right balance of the agent tractor that has been disrupted due to eccentricity of the front differential case, front wheel drive shaft, or transmission case. This makes it possible to create a tractor with a mid-mount mower that does not overturn on slopes.

[Brief explanation of drawings]

Figure 1 shows the entire side surface g2 of the agricultural tractor of the present invention.
The figure is also a plan view showing the overall arrangement. FIG. 3 is a plan view of the front axle. FIG. 4 is also a front sectional view. FIG. 5 is a side sectional view of the front differential case portion. FIG. 6 is a side sectional view of the center bin section. Figure 7 is a rear view of the deceleration case. +141...Mower Q4a)...Mower discharger (11...Front axle case (19d)...Front differential case hitting...Mission case (2)...Front wheel drive shaft (
)...Deceleration case applicant Yanmar Diesel Co., Ltd. agent Patent attorney Toshikazu Yano

Claims (2)

[Claims] (1) A 4@drive agricultural system characterized by arranging the front differential case eccentrically to the left and right on the front axle case, and also making the axis of the pinion shaft of the front differential case and the precise position of the front wheel drive shaft eccentric vertically. tractor. (2) The four-wheel drive exhibition tractor according to claim 1, characterized in that a mid-mount mower discharger is disposed on the opposite side of the front differential case.