JPH1044799A - Front wheel suspension device for passenger moving vehicles - Google Patents

Abstract

(57) [Problem] To provide a mobile vehicle capable of performing steering operation of a front wheel, transmitting power from an engine side to a transmission case side of a rear part of a vehicle body without hindrance, and facilitating getting on and off. Things. An engine mounted on a fuselage is provided so as to be inclined lower toward the rear side, and an engine and a transmission case disposed on a rear portion of the fuselage are interlocked and connected by a drive shaft. In addition, the swing shaft 2 of the front axle 1 supporting the front wheel 3 is inclined so as to be lower toward the rear as viewed from the side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front wheel supporting apparatus for a mobile vehicle such as a tractor and the like. And a moving vehicle that facilitates getting on and off the vehicle.

[0002]

2. Description of the Related Art Conventionally, in a moving vehicle of this type, for example, as described in Japanese Utility Model Laid-Open Publication No. 54-176916, the center pin of a tractor is moved only by a caster angle with respect to the horizontal direction. It is known that the vehicle is tilted so that the front is upward. However, in such a moving vehicle, only the center pin is provided at an angle, and the relationship between the engine, the transmission case at the rear of the body, and the drive shaft connecting these components is located above the center pin. Has not been improved at all.

[0003]

SUMMARY OF THE INVENTION It is a first object of the present invention to facilitate the steering operation of the front wheels, to surely transmit the power from the engine to a transmission case at the rear of the fuselage, and to get on and off the vehicle. And to provide a mobile vehicle that can easily get on and off the aircraft. Therefore, the present invention takes the following technical measures.

That is, an engine 15 mounted on an airframe is provided so as to be inclined lower toward the rear side, and the engine 15 and a transmission case 17 disposed at the rear of the airframe are provided with a drive shaft 1 extending in the front-rear direction.
A front axle 1 that supports the front wheels under the engine 15 and is tilted so as to be lower toward the rear as viewed from the side. The structure of the support device shall be used.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. Here, the riding mower 5 will be described as an example of the riding mobile vehicle. The left and right intermediate portions of the front axle 1 are supported by a machine frame 8 via a swing shaft 2. As shown in FIG. 2, the swing shaft 2 is inclined by an angle θ in a direction closer to the ground toward the rear as viewed from the side with respect to the fuselage forward direction arrow F.

Reference numeral 9 denotes a supporting frame, which connects the lower portions between the left and right frames, which are the machine frames 8, to the left and right, and supports the swing shaft 2 at the middle portion between the left and right frames. At both ends of the front axle 1, bearings 6, 6 are provided along the vertical direction, and rotatably support the king pins 7, 7. As shown in FIG. 1, the king pins 7, 7 have a king pin angle outwardly inclined by an angle α, the base of which is pivotally supported by the bearing portion 6, and the lower ends of which are outwardly formed in an L-shape in a front view. , And the projecting portion is used as the axle 4.

The axle 4 is provided with a camber angle by an angle β, and is inclined so as to approach the ground as the tip of the axle is directed outward, and the front wheel 3 is attached to the projecting portion. As shown in FIG. 3, knuckle arms 10, 10 are attached to the upper portions of the bases of the king pins 7, 7, respectively. Support frame 9
A pitman arm 11 is mounted on a shaft 12 on the upper surface of the device, and is swingably operated by a drag rod 13 which is interlocked with a steering handle described later.

Pitman arm 11 and knuckle arm 1
The portions between 0 and 10 are linked by right and left tie rods 14 and 14. The machine frame 8 of the riding lawn mower 5 is composed of side frames 8a, 8a which are long on both sides of the machine body and extend in the front-rear direction, and front and rear frames 8b, 8c. Above the front of the machine frame 8,
The engine 15 is mounted, and the area around the engine 15 is covered with a bonnet 16. A transmission case 17 is attached to a 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 denotes a clutch, 20 and 20 denote left and right rear wheels, and 21 denotes a drive axle. The 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. Seat 2
A steering handle 24 is provided in front of 3.
Between the front and rear wheels 3, 20, there is a lawn mower 25 as a working machine.
Are vertically movably mounted via front and rear links 26 and 27.

A drive pulley-2 is provided in front of the engine 15.
A power take-out section 28 comprising a transmission tool 9 such as a driven pulley 9, a driven pulley 30, and a V belt is provided. Engine 15
A drive shaft 18 for interlocking connection between the drive case 17 and the transmission case 17 is provided in an inclined state. Since the drive shaft 18 is provided so as to be inclined so that the rear is lowered, the getting on / off portion located in the front-rear central portion of the fuselage is less likely to come into contact with the drive shaft 18, and the step of getting on and off can be lowered. Getting on and off the aircraft becomes easier.

The inclination angle θ of the swing shaft 2 of the front axle 1 is set to the same inclination angle as that of the drive shaft 18. As shown in FIG. 4, the shaft of the driven pulley 30 of the power take-out portion 28 penetrates the swing shaft 2 and protrudes rearward, and is used as the drive shaft 32 of the lawn mower 25. Next, the operation of the above example will be described. When the steering handle 24 of the five riding lawn mowers traveling in the forward direction (arrow F) is rotated to the left, the front wheels 3, 3, which are left and right steering wheels, are drag rods as shown by solid lines in FIG. 3 (plan view). 13, the pitman arm 11, the tie rod 14, and the knuckle arm 10, the inner ring moves in the direction of arrow A, and the outer ring moves in the direction of arrow B, centering on the king pins 7, 7.

As shown in the side view of FIG. 2, the lower end of the king pin 7 is inclined by the same angle θ ₁ in the forward F direction as shown in the side view of FIG.
With the movement in the direction of arrow a, the axle 4 on the inner wheel side is pushed down, and the inclination is increased so that the wheel side surface 3a faces upward. Further, the outer wheel side axle 4 moves along the outer wheel side axle 4 along with the movement of the axle 4 in the direction of arrow B, and moves so that the wheel side surface 3b stands upright in the direction orthogonal to the ground. That is, in FIG. 4, the shoulder portion of the tire comes into contact with the ground due to the inclination on the inner wheel side at the time of turning, and the effective turning radius A decreases due to the deflection due to the load. Further, as shown in FIG. 5, since the outer ring side stands upright, the effective turning radius B becomes the same as the tire radius and becomes larger than A.

As described above, the effective turning radius is different between the inner and outer wheels, so that the body can be easily turned. When the steering wheel 24 is turned to the right, it becomes as shown by a virtual line in FIG. The rotational power of the engine 15 passes through the oscillating shaft 2 via the driving pulley 29, the driven pulley 30, and a transmission tool 31 such as a V-belt wound between the pulleys. The rotation is transmitted to the drive shaft 32, and the rotation is transmitted to the side of the lawn mower 25 mounted on the lower part of the abdomen to mow the lawn.

In this case, since the drive shaft 32 penetrates the swing shaft 2, the lawn mower 25 is moved from the engine 15 side.
The power transmission path to the side is simplified, and the rotational power of the engine 15 can be transmitted to the lawn mower 25 without any trouble.

[0015]

As described above, the present invention has the following technical effects. That is, the engine 15 mounted on the fuselage is provided so as to be inclined lower toward the rear side, and the engine 15 is connected to the transmission case 17 disposed at the rear of the fuselage via a drive shaft 18 extending in the front-rear direction. Front axle 1 that supports the front wheels under the engine 15
Of the drive shaft 18 that passes below the entrance / exit unit can be lowered, so that the entrance / exit unit can be low. This makes it easy to get on and off the aircraft.

In addition, the rear of the swing shaft 2 is formed low so as to be parallel to the inclination of the engine 15, so that the rotation effective diameter on the inner wheel side of the front wheels 3, 3 is reduced with the steering operation of the front wheels. It is possible to increase the outer-wheel-side effective rotation diameter of the front wheels 3 and 3 and to turn the aircraft to the left and right with a small force.

[Brief description of the drawings]

FIG. 1 is a front view of a main part shown with a part cut away.

FIG. 2 is a left side view of a main part.

FIG. 3 is a plan view of a main part.

FIG. 4 is a partial cross-sectional front view illustrating an operation state.

FIG. 5 is a partial cross-sectional front view illustrating an operation state.

FIG. 6 is an overall side view partially cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front axle 2 Oscillating shaft 3 Front wheel 4 Axle 7 Center pin 15 Engine 17 Transmission case 18 Drive shaft

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B62D 49/00 B62D 49/00 E

Claims (1)

[Claims] 1. An engine 15 mounted on an airframe is provided so as to be inclined lower toward the rear side, and the engine 15 and a transmission case 17 disposed at the rear of the airframe are connected via a drive shaft 18 extending in the front-rear direction. And a front axle device for a passenger moving vehicle, wherein a swing shaft 2 of a front axle 1 that supports a front wheel under the engine 15 is tilted lower toward a rear side as viewed from the side.