JPH01148623A - Front wheel support system for passenger vehicles - Google Patents

Abstract

PURPOSE:To facilitate the enhancement in turning performance by sloping an axle in the direction that approaches the ground as it extends outward, and further sloping a rocking shaft for supporting the central part of a front axle in the direction that approaches the ground as it extends rearward. CONSTITUTION:The central part of a front axle 1 is supported by a machinery frame 8 via a rocking shaft 2 to constitute a center-pivot type suspension device. And at both ends of the front axle 1, respective king pins 7 are turnably supported via respective bearings 6. Further, at respective lower ends of respective king pins 7 respective axles 4 on which respective wheels 3 are fitted are projected in the shape of the letter L. In the above constitution, the rocking shaft 2 is sloped by a prescribed angle theta so as to approach the ground as it goes rearward against the forward F. In addition, the axle 4 is provided with a prescribed camber angle alpha, and is sloped so as to approach the ground as the end thereof extends outward.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a device for facilitating turning of a passenger vehicle.

This invention is installed in a four-wheeled passenger vehicle, and when traveling forward while turning to the left or right, the front wheel is rotated while reducing the inner rotational effective diameter of the front wheel as the front wheel is steered. This invention relates to a turning facilitation device that increases the effective rotational diameter of the outer ring side of the aircraft and attempts to turn the aircraft left and right with a light force.

[Prior art and problems] In order to improve running stability such as turning performance and straight-line performance, conventional technology provides front alignment to the front wheels, that is, camber, caster, toe-in, and kingpin angles.
The steering wheel is easy to operate, the front wheels are highly resilient, and the operation is reliable and stable.

However, if complicated alignment is provided, manufacturing becomes difficult, one assembly and adjustment become troublesome, and this becomes a factor of cost increase.

[Means for solving the problem of interlayer] The present invention aims to solve such problems of the conventional device, and takes the following technical measures.

That is, the left and right intermediate parts of the front axle 1 are used as the swing shaft 2, and the steering axles 3, 3 are provided at both ends of the front axle 1.
Place the axle 4 to which the axle 3 is attached,
To facilitate turning of a passenger moving vehicle, characterized in that the swing shaft 2 is inclined in a direction closer to the ground toward the outside, and the swing shaft 2 is tilted in a direction closer to the ground toward the rear when viewed from the side. The configuration of the device.

[Effects of the Invention] With the above-described configuration, the present invention provides the following technical effects. That is, by simply tilting the center-pivot type rocking shaft 2 of the front axle 1 in a direction approaching the ground on the rear side when viewed from the side, the front wheels 3, 3 can be steered. By increasing the effective rotational diameter of the outer wheels of the front vehicle @3, 3 while decreasing the effective rotational diameter of the inner wheels of 3.3, it becomes possible to turn the aircraft to the left and right with a light force.

[Examples] Examples of the present invention will be described in detail below by way of example with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the component parts described in this example are not intended to limit the scope of this invention to only those, unless there is a specific description. , is merely an illustrative example.

The present invention is applied to low-speed passenger vehicles such as agricultural tractors and construction machines that travel on rough terrain. This invention is folded into the front axle 1 attached to the front axle.

The front axle 1 has a so-called center-pivot type suspension structure in which the left and right intermediate portions are pivotally supported by a machine frame 8 via a swing shaft 2.

As shown in FIG. 2, the swing shaft 2 is inclined at an angle of 0 in a direction approaching the ground on the rear side when viewed from the side with respect to an arrow F in the forward direction of the aircraft.

Reference numeral 9 denotes a support frame, which connects the lower portions of the left and right frames, which are the machine frame 8, to the left and right, and pivotally supports the swing shaft 2 at the left and right intermediate portions.

At both ends of the front axle 1, there are vertical bearing parts 6,
6 is provided to rotatably support a king pin 7.7.

As shown in FIG. 1, the king pin 7 is directed outwardly.
The base portion is pivotally supported by a bearing portion 6 with a king pin angle inclined by an angle α, and the lower end is provided to protrude outward in a cross-shaped shape when viewed from the front, and this protrusion portion serves as an axle shaft 4.

The axle 4 has a camber angle of an angle β, and the tip of the axle is inclined in a direction protruding toward the ground as it goes outward.
A wheel 3 is attached to this protrusion.

As shown in FIG. 3, knuckle arms 10, 10 are respectively attached to the upper part of the base of the king pin 7.7.

A pitman arm 11 is pivoted 12 on the upper surface of the support frame 9, and is swung by a drag rod 13 that is interlocked with a steering handle, which will be described later.

The pitman arm 11 and the knuckle arm 10°10 are interlocked and connected by left and right tie rods 14,14.

The machine frame 8 of the riding lawn mower 5 is composed of side frames 8a, 8a extending long in the front and rear direction on both sides of the machine body, and front and rear frames 8b, 8c.

An engine 15 is mounted above the front of the machine frame 8, and a bonnet 16 covers the engine 15.

A transmission case 17 is attached to the rear of the machine frame 8, and the engine 15 and the transmission case 17 are interlocked and connected by a drive shaft 18. 19 is the clutch, 20°20 is the left and right rear wheels,
21 is a drive axle.

Left and right rear wheels 20.20 above are left and right fenders 22,2
2, and a seat 23 is provided between the left and right fenders 22, 22.

A steering handle 24 is provided in front of the seat 23.

A lawn mowing tool 25 is attached between the front and rear wheels 3 and 20 via front and rear links 26 and 27 so as to be vertically movable.

In front of the engine 15, there is a driving pulley 29, a driven pulley 30, and a transmission device 31 such as a V-belt. A power take-off section 28 is provided.

The engine 15 and the transmission case 17 are directly connected in an inclined state by a drive shaft 18 that does not have a swinging part in the middle.
The swing axis 2 of the front axle 1 is aligned with the same inclination as this inclination.
An inclination angle of 0 is set.

As shown in FIG. 4, the axis of the driven pulley 30 of the power take-off portion 28 passes through the swing shaft 2 and protrudes rearward to serve as a drive shaft 32 of the lawn mowing tool 25.

Next, the effect of rotation will be explained.

When the steering handle 24 of the five riding lawn mowers traveling in the forward direction (arrow F) is rotated to the left, the left and right steering axles 3, 3 move as shown by solid lines in FIG. 3 (plan view).
Drag rod 13. Pitman arm 11. Tie rod 14. Via the knuckle arm 10, the kingpin 7.
Centering around part 7, the inner ring moves in the direction of the arrow, and the outer ring moves in the direction of the arrow.

As shown in FIG. 2 (side view), the king pin 7 has its lower end inclined in the forward direction F by the same angle 01 as the swing shaft 2 has an inclination angle of 0. Along with the movement in the direction, the inner wheel side axle 4 is pushed down so that the wheel side surface 3a faces upward (the third
The left axle, shown by the solid line in the diagram,) increases the inclination. Furthermore, as the axle 4 moves in the direction of the arrow, the outer axle 4
While moving the outer wheel side axle 4 upward, the axle side surface 3b moves upright in a direction perpendicular to the ground (the right wheel shown by the solid line in FIG. 3).

In other words, as shown in FIG. 4, when turning, the inner wheel side tilts and the shoulder portion of the tire comes into contact with the ground, and the effective turning radius A becomes smaller due to deflection due to the load.

Further, as shown in FIG. 5, since the outer wheel side stands upright, the effective rotation radius B is the same as the tire radius and is larger than A.

In this way, the effective turning radius differs between the inner and outer axes, making it easier to turn.

When turning the steering wheel 24 to the right.

It becomes as shown by the imaginary line in FIG.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially sectional front view of the main part, FIG. 2 is a left side view of the main part, FIG. 3 is a plan view of the main part, and FIG. 4 and 5 are partially sectional front views of essential parts for explaining the operating state, and FIG. 6 is a partially sectional overall side view. In the figure, numeral 1 is the front axle, and 2 is the swing axis. 3 is a wheel, and 4 is an axle.

Claims (1)

[Claims] The left and right middle parts of the front axle 1 are used as the swing shaft 2, and the steering wheels 3 are arranged at both ends of the front axle 1. A device for facilitating turning of a passenger vehicle, characterized in that the swing shaft 2 is inclined in a direction in which the vehicle approaches the ground, and the swing shaft 2 is tilted in a direction that approaches the ground closer to the rear when viewed from the side.