JPH0365470A - Steering system of power running car - Google Patents

Abstract

PURPOSE:To permit rapid turning simply by moving a handle the time of turning by making a constitution wherein a front accelerator is tilted so that turning inside of a body is lowered at the time of turning a front wheel steering mechanism. CONSTITUTION:When a vehicle 1 reaches an end of a garden and turns toward an adjacent unreaped area, a lift lever 36 is moved to an up position to have a reaper 31 elevated as well as a handle 11 is directed toward the unreaped area to have the vehicle 1 turned. Then, drug arms 8, 8 of knuckle spindles 7, 7 are pushed and pulled via a steering pinion 14, a sect gear 15 and drug rods 17, 17 to have front wheels 10, 10 swung toward the turning direction. Then, while the front wheel 10 on the inner side of turning is swung upward and the front wheel on the outer side of turning is swung downward so that the inner side of turning of the vehicle 1 is lower, the vehicle is turned toward the adjacent unreaped area. Then by moving the lift lever 37 to a down position and lowering the reaper 31, reaping is continued.

Description

[Detailed Description of the Invention] [Industrial Application Field] The application field of the present invention is a steering device for a power vehicle such as an agricultural tractor, a riding rice transplanter, a riding mower, or a combine harvester.

[Prior art]

A front axle supporting the left and right front wheels is installed at the front of the vehicle body and is movable up and down via a center pivot.
Left and right rear wheels are installed at the rear of the vehicle, and the handlebars and the knuckle spindle arms at the left and right ends of the front axle of the front wheels are interlocked and connected via tie rods.

[Problem to be solved by the invention]

In the above conventional technology, turning is performed by steering the front wheels left and right by turning the steering wheel, or, in order to make a sharp turn, the rear wheel on the turning side must be braked at the same time as turning the steering wheel. However, in the former case, it is not possible to make sharp turns, and in the latter case, the durability of the brakes is a problem.

[Means to solve the problem]

This invention has taken the following technical means to solve the above problems. In other words, a front axle that supports the left and right front wheels is provided at the front of the vehicle body so that it can swing left and right via a center pivot, and a single rear wheel is provided at the rear of the vehicle body so that the front wheel can be rotated left and right as the steering wheel is rotated. The front wheel steering mechanism is configured to tilt the front axle so that the inner side of the vehicle body is lower when turning.

[Effect]

In a field, when a powered vehicle is running and doing agricultural work and reaches the edge of the field, the front wheels are turned by the front wheel steering mechanism when the handle is turned while raising the implement to turn to the adjacent land. Along with being cut in the direction of rotation,
The front axle swings downward so that the front wheel on the outside of the turn swings downward, and the front wheel on the inside of the turn swings upward so that the turning side of the vehicle becomes lower. When the direction of the vehicle body has been changed, the vehicle body is returned to a horizontal state, and the work equipment is then lowered to perform agricultural work on the adjacent land.

〔effect〕

In this invention, a front axle supporting the left and right front wheels is provided at the front of the vehicle body so as to be movable up and down via a center pivot, and a single rear wheel is provided at the rear of the vehicle body, so that the front wheels can be moved left and right as the steering wheel rotates. The front wheel steering mechanism that rotates is configured to tilt the front axle so that the inside of the car body turns lower when turning, so when turning, simply rotating the handle will lower the front wheel so that the inside of the car body turns lower. The axle can be tilted to enable sharp turns.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, the structure will be explained.0 A front bracket 3 and a rear bracket 4 are attached to the front part of the frame 2 of the vehicle body 1 of a riding mower.
A front axle 5 is positioned between the front bracket 3 and the rear bracket 4, and is mounted so as to be movable up and down via a center pivot 6 facing in the front-rear direction. At both left and right ends of the axle 5, there are knuckle spindles 7 located vertically.
The knuckle spindle 7.7 has a drag arm 8, 8 projecting rearward between the upper and lower portions, and a transverse shaft portion 9 projecting outwardly at the bottom thereof.
, 9 are integrally provided, and front wheels 10, 10 are attached to this horizontal shaft portion 9.9.
It is centrally connected. A handle post 12 that supports the handle 11 on the upper side is installed in the front part of the frame 2, and a handle shaft 13 supported by the handle post 12.
A steering pinion 14 is provided at the lower end protrusion of the steering pinion 14 , and a sect gear 15 pivotally attached behind the steering pinion 14 is engaged with the transverse pinion 14 . An upper end ball joint 16.16 is connected to this sect gear 15, and
Lower end ball joint 1 of drag rod 17°17 arranged so that the lower part is located at the rear and in an inclined position
8.18 are connected to the drag arms 8,8. The engine 19 is attached to the upper side of the front-rear middle part of the frame 2, and the crankshaft 2o of this engine 19 is made to protrude downward, and an output pulley 2 is placed on the downwardly protruding part of the crankshaft 2o within the range of the frame 2. Attach the king to the rear of frame 2.

The transmission case 22 is attached so that the rear wheel 24 attached to the rear axle 23 protruding to the left side of the transmission case 22 is located at the left-right center of the frame 2, and a support arm is provided on the frame 2 to protrude to face the transmission case 22. The outer end of the rear axle 23 is rotatably attached to the transmission case 25, and a human-powered V pulley 27 is attached to the input shaft 26 protruding above the transmission case 22 so as to be located within the range of the frame 2. A V-belt 28 is hooked onto the input V-pulley 27, and power transmission to the transmission case 22 is interrupted by a tension clutch (not shown) of the V-belt 28 provided on the frame 2. A floor 29 covers the upper part of the engine 19, and a fender 30 that covers the rear wheel 23 is provided behind the floor 29.

The mowing device 31 is installed between the front link 32.32 and the rear link 33 under the belly between the front wheels 10.10 and the rear wheels 24.
It is vertically movably connected to the frame 2 via cross-shaped suspension links 35, 35, which are configured by pivotally connecting the engine 19 with the intermediate pins 34 and 34, and is provided on the frame 2 on the front side of the engine 19. Hydraulic device 3 operated by lift lever 36
The lift arm 38.38 of No. 7 and the suspension link 35.35 are pivoted at both ends or connected by buttrots 39.39. The connection relationship between the suspension links 35, 35 and the mowing device 31 is as follows: the attachment holes (not shown) of the lower end fork portions 40 of the front links 32, 32 and rear links 33, 33, and the front and rear of the mower deck 41. Standing bracket 421. .

Connecting pins 44. are inserted into vertically elongated holes 43.・
.

It is inserted through and connected so that it can swing left, right, up and down.

The transmission case 22 includes a PTO clutch (PTO clutch) that connects and disconnects the rolling force of the PTO shaft 4 axes 5 which protrudes below the transmission case 22.
(not shown) is provided, and the PTO output output of the 5-digit PTO shaft with 4 axes - the input V of the pulley 46 and the upper input shaft 47 of the mowing device 31
A V-belt 48 is hooked onto the pulley 48 and rotated. Also,
The lift lever 37 is configured to be able to be locked in the raised position and the lowered position of the mowing device 31 by a locking mechanism (not shown),
The mowing height of the grass is adjusted by vertically adjusting the gauge wheels 49. Further, a grass collection device is provided on the rear side of the vehicle body l, and the grass cut by the grass cutting device 31 is configured to be collected in the grass collection device (not shown) via a conveyance section (not shown). has been done. Note that 50 is a tension clutch lever and 151 is a PTO clutch lever.

Next, the operation and effect will be explained. When mowing lawn grass in the garden in a reciprocating manner using a riding agricultural machine, the lift lever 36 is rotated to the lowered position to ground the reaping device 3, and
When the tension clutch is connected after the PTO clutch is connected, the vehicle body 1 moves along the outside of the garden to cut grass. If the outside part of the garden is curved, handle 11
If you turn the steering wheel 10 to the left, the steering pinion 14 will turn counterclockwise, and the sect gear 15 meshed with it will turn clockwise. Draklot 17 on the left after being turned to
At the same time, the right drag rod 17 is pushed out and the front axle 5 moves so that the left side is higher and the right side is lower, tilting the vehicle body 1 so that the left side is lower, or by turning the steering wheel 10 to the right, the vehicle body 1 will be tilted so that the right side is lower, but in the range where the steering wheel 10 is turned at a small angle, the left and right tilt of the vehicle body 1 is due to the bracket 4.
The mowing device 31 moves horizontally and vertically within the range of the elongated holes 43 . When the vehicle body 1 reaches the edge of the garden and turns toward the adjacent unmown area, the lift lever 36 is rotated to the raised position to raise the reaping device 1131.

When the vehicle body 1 turns by turning the steering wheel 10 toward the unmowed area, the steering pinion 14. Sect gear 1
5 and the drag rod 17.17 to push and pull the drag arms 8, 8 of the knuckle spindle 7.7 to rotate the front wheel 10.10 in the turning direction, and the front wheel 10 on the inner side of the turn moves upward and towards the outer side of the turn. The front wheels 10 of the vehicle rotate downwardly, and the vehicle body 1 rotates toward an adjacent unmowed area while tilting so that the inner side of the turn becomes lower. Therefore, lift lever 3
The reaping operation is continued by lowering the reaping device 31 by rotating the reaping device 7 to the lowered position. In this way, the turning movement is repeated several times at the edge of the garden, and the grass in the garden is mowed in an adjacent reciprocating manner.

In this embodiment, in the case of turning, the handle 1 is
When turning 1 to the left or right, the inside of the turn of the car body 1 is tilted lower, so when turning, it is possible to make sharp turns by simply turning the handlebar 11 to the left or right without operating the brake of the car body 1. It can increase work efficiency.

[Brief explanation of drawings]

The drawings show one of the embodiments of the present invention, FIG. 1 is a plan view showing the function of the main part, FIG. 2 is a front view showing the function of the main part,
FIG. 3 is an overall side view, and FIG. 4 is an overall plan view. Explanation of main symbols 1... Vehicle body 2... Frame 5... Front axle 6... Center pivot 7... Knuckle spindle 8... Drag arm 10... Front wheel 11... Handle 13・・・Handle shaft 14・
...Steering pinion 15...Sect gear 16...
Upper end ball joint 17...Dragon knot 17
18...Lower end ball joint 22...Transmission case 23...Rear axle 24...Rear wheel 31...
Grass cutting device 35... Hanging link 36... Lift lever 41... Mower deck 42... Bracket 4
3...Long hole 44...Connecting pin

Claims (1)

[Claims] (1) A front axle supporting the left and right front wheels is provided at the front of the vehicle body so that it can swing left and right via a center pivot, and a single rear wheel is provided at the rear of the vehicle body, allowing the front wheels to move left and right as the steering wheel rotates. A steering device for a powered vehicle, characterized in that the front wheel steering mechanism for rotating the front wheel is configured to tilt the front axle so that the inner side of the vehicle body becomes lower when turning.