JPS5996019A - Traveling apparatus for agricultural working vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traveling device for an agricultural vehicle in which a differential device for driving left and right wheels whose direction can be changed can be switched to a differential lock state.

In such a traveling device, for example, when making a sharp turn on a headland, the differential gear is differentially locked so that the left and right wheels, which rotate integrally, can provide sufficient propulsive force while making a good turn even in wet fields. It is desired to switch to the state.

However, conventionally, in order to switch the differential between the differential lock state and the differential lock release state, an assistance lever or a foot pedal has been provided to press the switch at the appropriate time, but this not only makes the operation cumbersome and troublesome. However, it was difficult for unskilled persons to perform appropriate operations.

Such inconvenience should be resolved (Japanese Patent Application Laid-Open No. 56-167564)
As disclosed in the publication, the differential gear is automatically switched to the differential lock state only when the left and right wheels change direction from the straight-ahead position by more than a set range. Means for switching a differential gear between a differential lock state and a differential lock release state has been proposed.

However, according to the above means, even when the left and right wheels are returned to the straight-ahead position at the end of a turn, the differential device is unnecessarily maintained in the differential lock state.
This had the disadvantage of unnecessarily disturbing the mud in the field. In other words, if you switch the differential gear to the differential lock state during a sharp turn, it is undeniable that the wheel on the turning side of the left and right wheels that rotate together will slip, and it is better to avoid this slip situation as much as possible. Although it is possible to suppress mud disturbance in the field, the above-mentioned method does not require a large amount of propulsive force, or even at the end of the turn, where there is no particular problem even if a decrease in propulsive force occurs, the process continues unnecessarily. (
This meant that the differential was kept in a locked state, making it easy to cause muddy disturbances.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to suppress mud turbulence as much as possible while taking advantage of the ability to make sharp turns with good controllability. It is in.

A characteristic configuration of the present invention is that, in the traveling device of the agricultural vehicle described above, when changing the direction of the left and right wheels to the maximum direction change position, the differential device is switched to a differential lock state within a range beyond the first setting position. , and when changing the direction of the left and right wheels toward the straight-ahead position, the differential # setting is set to a differential lock release state within a range beyond the second setting position on the side of the maximum direction change position from the first setting position. As if switching,
The present invention is characterized in that a mechanism is provided that automatically switches the differential device between a differential lock state and a differential lock release state in response to an operation to change the direction of the left and right wheels.

Next, the effects of the characteristic configuration of the present invention will be described.

In other words, by automatically switching the differential gear between the differential lock state and the differential lock release state as the left and right wheels change direction, the differential gear can be quickly and easily operated without requiring special operations on the differential gear. This allows for better turning. In particular, according to the present invention, when changing the direction of the left and right wheels toward the straight-ahead position, the second
Since the setting position is set closer to the maximum direction change position than the first setting position, the left and right wheels can be returned to the straight-ahead position at the end of the turn and the differential lock can be released as quickly as possible. Therefore, it is possible to suppress the disturbance of the mud in the field as much as possible.Therefore, it is possible to obtain a running system for agricultural vehicles that has a great practical advantage of being able to perform sharp turns well while suppressing mud disturbance as much as possible. It's arrived.

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

As shown in Figure 1, a pair of left and right steering drive front wheels (1)
, (1), and a pair of left and right driving rear wheels +21. +21
, a steering wheel (3) for changing the direction of the front wheels (11, +11), and a driver's seat (4).
A traveling vehicle body is constructed by providing a vehicle body, and a seedling planting device (5) is connected to the rear of the vehicle body so that it can be raised and lowered by a hydraulic cylinder (6), thereby constructing a riding rice transplanter. .

In order to transmit the output of the engine (7) mounted on the front part of the traveling vehicle body to the front and rear wheels, as shown in Fig. 2, a Mitsushicon case that also serves as the engine (7) and the front wheel drive case is used. (8) Two transmission bells with different transmission ratios wound between them) (9a).

Swinging lever f101 that selectively tensions (9b)
(See Fig. 1) is provided to perform auxiliary speed change, and tension arms (Lla) and (llb) for the transmission belts (9a) and (9b), respectively, swing operation toward the belt separation side. The main clutch pedal is provided so that it can be depressed and operated with the left foot, so that wheel drive and seedling planting device drive can be switched on and off at the same time. Inside the Mitsushicon case (8), there is a front wheel differential device f141 and an interlocking differential lock piece (14) for switching the differential device (141) to the differential lock state.
A) is provided. Also, the Mitsushicon case (8)
In addition to providing a shaft (161) that partitions the power from the rear wheel cutting case f15 to the input bevel gear (15A) inside,
Rear wheel drive case (within 1 unit, left and right rear wheels (2!,
(2j is driven by a movable clutch piece (17a), (17a
) The steering clutches (171
, a, and the left and right rear wheels (2j, (27K) are provided with multi-disc steering brakes (18) that act separately on each.

F＠Left and right steering clutch αη, +i′7) A foot pedal operated with the right foot is interlocked with each other, and the left and right rear wheels +2 are selectively operated by the left and right pedals and @.
! , (2!) is configured so that the drive of either one of the left and right sides is stopped and turning, etc. at the edge of the rice field can be performed satisfactorily in cooperation with the lateral operation using the handle (3). Plate brake 0 seconds.

The operating pieces (18a) with each 0 mark and the steering clutch port η
.

The movable clutch pieces (17a) of each αη are interlocked and connected via sleeves, and the clutches 0η and an are disengaged by the first step depression operation of the pedals 2 and 1, and the pedals 0 and 1 are further depressed. brake u
81. (Work 181, left and right rear wheels +2! , (
It is configured to quickly stop the rotation of 2j.

Left and right pedals (221) are provided with a swingable connecting piece (goods) on one side, and a locking part that releasably locks the connecting piece C4 on the other side, and by the connection, it is possible to drive on the road. When driving at high speeds, such as when driving at high speeds, the pedal ■.

By pressing down on one side of the pedal, both pedals are
Operate the left and right rear wheels at the same time +2! , (2) The drive of (2) is stopped at the same time to prevent unexpected turning (and the traveling can be stopped safely and quickly).

As shown in FIGS. 2 and 3, left and right front wheels (1).

(1) Each knuckle arm (to), (20) to the pitman arm (5), a pair of left and right drag links (a)
The left and right front wheels (1) can be rotated to change direction by rotating the handle (3). Then, while urging the differential lock piece (14a) toward the differential lock release side and providing an electromagnetically operated push rod holder for operating the differential lock piece (14a) toward the differential lock side, the swing of the pitman arm force is also provided. When changing the position of the left and right front wheels +11, (potentiometer ■, left and right front wheels 11) to the left and right maximum direction change positions, the differential gear (141) is set to the differential lock state. 1st to switch
A first setting device T31) for setting the setting position (θ□), and a second setting position for switching the differential device (141) to the differential lock release state when changing the direction of the left and right front wheels [11 to the straight-ahead position side] (θ2) is provided closer to the maximum orientation change position than the first setting position (θ1), and these devices (to) +311, c
121, a control circuit (2
), so that when changing the direction of the left and right front wheels fil, fi+ to the maximum direction change position, the differential device (141 is switched to the differential lock state within a range beyond the first setting position (θ, ), and , the left and right front wheels (1).

When changing the direction of the +11 to the straight-ahead position, the differential device a41 is switched to a differential lock release state within a range beyond the first setting position (θ1) and a second setting position on the maximum direction change position side. , the left and right front wheels +11,
The configuration is such that the differential device αa can be automatically switched between a differential lock state and a differential lock release state in response to an operation to change the direction of il+.

In short, when making a sharp turn by significantly changing the direction of the left and right front wheels tl) and +11, the left and right front wheels (1).

(It is possible to obtain sufficient propulsion force by rotating the two wheels together, and also to switch to the differential lock release state as early as possible at the end of the turn to prevent disturbing the mud in the field.) .

To explain the control circuit 匈, there is a differentiation circuit that differentiates the signal from the potentiometer to determine the direction of change in the direction of the front wheel +11, and a differentiation circuit that differentiates the signal from the potentiometer and determines the direction in which the direction of the front wheel +11 is changed. Flip-flop circuit for storing the orientation change direction (to), @Yuill
A first comparator (a) detects that the position of the front wheel il+ has reached the setting value (θ, ) of the first setting device circle, and a first comparator (a) detects that the position of the front wheel il+ has reached the setting value of the second setting device (311). In addition to providing a second comparator (9) for detecting , an AND circuit (09) and an OR circuit (40) for operating the energization operation transistor (to) based on the information of these device examples 9 and 9 can be provided. be.

The present invention relates to a type in which only one of the front and rear wheels ftl (21) is driven using a differential device (141),
Front and rear wheels fi+, T2! Both the differential gear (141
It can also be applied to a type of drive using.

The differential self-help switching operation mechanism can be configured in various ways, such as an electrically controlled type or a mechanical type using a cam, etc., and the specific structure can be changed in various ways. The position of the second setting position (θ2) can also be changed in various ways.

Further, the present invention can be applied to various agricultural vehicles such as agricultural tractors and agricultural transport vehicles in addition to riding-type rice transplanters.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the traveling device for a rice transplanter according to the present invention, FIG. 1 is a side view of a riding rice transplanter, FIG. 2 is a schematic plan view of a traveling transmission structure, and FIG. 3 is a schematic plan view of a traveling transmission structure. ····Wheel,
(141... differential gear, (θ1)...
First setting position, (θ2)...Second setting position.

Claims (1)

[Scope of Claims] A traveling device for an agricultural vehicle, in which a differential device (a) for driving left and right wheels (ill, tl) whose direction can be changed can be switched to a differential lock state.
, fJ) to the maximum direction change position, the differential gear (141) is switched to the differential lock state within a range exceeding the first setting position (θ□), and the left and right wheels +1), +1 ) to the straight-ahead position, the differential device [141 gold defrock released state] is set within a range beyond the second setting position (which is the maximum direction change position) from the first setting position (θ1). To switch to
The left and right wheels (1). (1) The differential gear (
14) A running device for an agricultural vehicle, characterized in that it is provided with a mechanism for operating the differential locking state and the differential unlocking state.