JPH0829678B2 - Front wheel suspension device for passenger mobile vehicles - Google Patents

Description

The present invention relates to a front wheel support device for a passenger vehicle.

The present invention, in a four-wheeled passenger vehicle, makes forward rotation while turning left or right, and along with steering operation of the front wheels, the inner wheel side effective rotation diameter of the front wheels is reduced, while The present invention relates to a front wheel support device that increases the outer wheel side effective rotation diameter and tries to turn a vehicle body to the left and right with a light force.

[Prior Art and Problems] In the conventional art, in order to improve traveling stability such as turning performance and straight running performance, front alignment is performed on the front wheels, that is,
The camber, casters, toe-in, and kingpin angles are given to make the steering wheel lighter, the front wheels have greater resilience, and the certainty and stability of the operation.

However, if a complicated alignment is provided, manufacturing becomes difficult, assembly and adjustment are troublesome, and cost increases.

[Means for Solving the Problem] The present invention is intended to solve such a problem of the conventional apparatus, and has taken the following technical means. That is, in a passenger moving vehicle in which steering wheels 3, 3 are provided on both left and right sides of a front axle 1 which is swingably supported around a swing shaft 2, an axle 4 on which the wheels 3, 3 are mounted.
Is provided so as to be inclined toward the ground as it goes outward from the front, and the swing shaft 2 is viewed from the side,
A front wheel suspension device for a passenger moving vehicle is characterized in that it is inclined toward the ground toward the rear.

[Advantages of the Invention] With the above-described configuration, the present invention has the following technical advantages. That is, by simply tilting the center pivot type swing shaft 2 of the front axle 1 in a direction closer to the ground toward the rear side in the side view, the front wheels 3 and 3 are steered and the front wheels are By increasing the outer wheel side effective rotation diameter of the front wheels 3,3 while decreasing the inner wheel side effective rotation diameter of the wheels 3,3, it becomes possible to turn the airframe left and right with a light force.

Embodiments Embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. , It is just an example of explanation.

The present invention is carried out on a constant speed traveling passenger moving vehicle such as an agricultural tractor or a construction machine traveling on an uneven terrain, and the illustrated example is mounted on both ends of the front lawn mower 5 at wheels 3 and 3. Also, the present invention is folded into the front axle 1.

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

As shown in FIG. 2, the swinging shaft 2 has an arrow F in the forward direction of the machine body.
On the other hand, in the side view, the rear side is inclined by the angle θ in the direction approaching the ground.

Reference numeral 9 denotes a support frame, which connects left and right lower parts between left and right frames, which are the machine frames 8, and pivotally supports the swing shaft 2 at an intermediate portion between the left and right.

At both ends of the front axle 1, vertical bearings 6,
6 is provided to rotatably support the king pins 7, 7.

As shown in FIG. 1, the kingpin 7 has its base portion pivotally supported by the bearing portion 6 with a kingpin angle that is inclined outward by an angle α, and its lower end projects outward in an L-shape when viewed from the front. The protruding portion is used as the axle 4.

The axle 4 is provided with a camber angle by an angle β, and is provided so as to incline toward the ground as the tip of the axle goes outward, and the wheel 3 is attached to this protrusion.

As shown in FIG. 3, knuckle arms 10 and 10 are attached to the upper portions of the bases of the kingpins 7 and 7, respectively.

A pitman arm 11 is pivotally mounted 12 on the upper surface of the support frame 9, and is swingably operated by a drag rod 13 that is interlockingly connected with a steering handle described later.

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

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

An engine 15 is placed above the front of the machine casing 8, and the periphery of the engine 15 is covered with a bonnet 16 or the like.

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

The upper left and right rear wheels 20, 20 are covered with left and right fenders 22, 22, 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 work implement 25 is mounted between the front and rear wheels 3 and 20 so as to be vertically movable via front and rear links 26 and 27.

In front of the engine 15, a power take-out section including a drive pulley 29, a driven pulley 30, and a transmission tool 31 such as a V-belt.
28 are provided.

The engine 15 and the transmission case 17 are directly connected to each other in a tilted state by a drive shaft 18 having no swinging part in the middle, and the tilt angle θ of the swing shaft 2 of the front accrus 1 is the same as this tilt. Is set.

As shown in FIG. 4, the shaft center of the driven pulley 30 of the power take-out portion 28 penetrates the swing shaft 2 and protrudes rearward to serve as the drive shaft 32 of the lawn mowing work tool 25.

 Next, the operation of the illustrated example will be described.

Of the five riding lawn mowers traveling in the forward direction (arrow F),
When the steering wheel 24 is rotated to the left, the left and right steering wheels 3, 3 are moved to the kingpin via the drag rod 13, the pitman arm 11, the tie rod 14, and the knuckle arm 10 as shown by the solid line in FIG. 3 (plan view). Focusing on the 7th and 7th parts,
The inner ring moves in the direction of arrow a and the outer ring moves in the direction of arrow b.

As shown in FIG. 2 (side view), the lower end of the kingpin 7 is inclined in the forward F direction by the same angle θ ₁ as shown in FIG. 2 (side view). Along with the movement in the direction a, the axle 4 on the inner wheel side is pushed downward, and the inclination is increased so that the wheel side surface 3a faces upward (the left wheel shown by the solid line in FIG. 3). In addition, the outer-wheel-side axle 4 part moves upward along with the movement of the axle 4 in the arrow B direction, and the wheel side surface 3b thereof moves.
Moves upright in the direction orthogonal to the ground (right wheel shown by the solid line in FIG. 3).

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

Also, as shown in FIG. 5, since the outer ring side is upright,
The effective turning radius B is the same as the tire radius and is larger than A.

In this way, the effective turning radii are different between the inner and outer wheels, so that the wheels easily turn.

When the steering handle 24 is turned to the right, it is as shown by the phantom line in FIG.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partially sectional front view of a 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. FIGS. 5 and 5 are front views of essential parts partially in cross section for explaining the operating state, and FIG. 6 is a side view of the whole in partial cross section. In the figure, reference numeral 1 is a front axle, 2 is a swing shaft, 3 is a wheel, and 4 is an axle.

Claims (1)

[Claims] 1. A passenger moving vehicle in which steering wheels 3, 3 are provided on both left and right sides of a front axle 1 which is swingably supported around a swing shaft 2, and an axle 4 on which the wheels 3, 3 are mounted.
Is provided so as to be inclined toward the ground as it goes outward from the front, and the swing shaft 2 is viewed from the side,
A front wheel support device for a passenger vehicle, wherein the front wheel support device is inclined toward the ground toward the rear.