JP5652970B2 - Tire lifting structure - Google Patents

Description

  The present invention relates to a tire lifting structure for a vehicle having six or more tires.

  Large trucks usually have 6 or more tires because of their long body, but in the case of vehicles with a short body length such as small trucks and light trucks, they are usually composed of 4 wheels. . And even for such small trucks and light trucks, there are merits such as adding more tires to make it more than six wheels, increasing the vehicle body size and increasing the loading capacity, and obtaining stability during driving. is there.

  On the other hand, if six or more tires are provided on a vehicle having a short vehicle body length, inner wheel differences that differ from the front wheels occur between the four tires located behind, resulting in a U-turn or garage. When turning with a small turning radius as in the case, there is a risk that tires will wear due to intense friction between the rear four wheels and the road surface.

  Therefore, Patent Document 1 discloses a short-shaft interlocking trailer vehicle that can hang over a trailer unit connected to the rear of a truck from the rear when the vehicle is empty and float the tire of the trailer unit from the road surface. .

  However, this means that the tires are lifted off the road surface by lifting the connected trailer itself, and this operation is impossible when cargo is loaded, and the car body itself needs to be extensively modified. It was said. Furthermore, the tires that can be floated were limited to the last one.

JP 9-52584 A

  Accordingly, the present invention provides a tire lifting structure that overcomes the drawbacks of the conventional tire lifting structure, that allows the tire to be lifted even when cargo is loaded, and that can be mounted without making extensive modifications to the vehicle body. It is to be an issue.

  The present invention solves the above-described problem, and an axle supported so as to be able to move up and down with respect to the vehicle body, and an elastic member biased in a direction to widen the distance between the axle and the vehicle body. And an ascending / descending structure including a raising means for raising the axle with respect to the vehicle body.

  Since the tire elevating structure according to the present invention can raise only the tire and the axle relative to the vehicle body, the vehicle can travel from 6 wheels to 4 wheels even when cargo is loaded.

  In addition, the tire lifting structure according to the present invention can be attached to the conventional vehicle without any major modification. Furthermore, according to the tire lifting structure according to the present invention, the position where the tire having the lifting means is provided is not limited to the last position.

Schematic side view of tire lifting structure according to the present invention The figure which represented the tire raising / lowering structure which concerns on this invention from back diagonally downward

  Hereinafter, embodiments of the tire lifting structure of the present invention will be specifically described with reference to the drawings. Note that the present invention is not limited to these embodiments.

  In the embodiment shown in FIGS. 1 and 2, an auxiliary wheel 103 is further added to the rear of the rear wheel 102 of a normal four-wheel truck so that the specification of a six-wheeled vehicle is achieved. The rear wheel 102 has the same function and structure as a general vehicle. That is, the rear wheel 102 includes a suspension mechanism including a rigid axle 21, a leaf spring 22, and a shock absorber 23. The driving force is transmitted through a drive shaft connected to the engine so as to be rotationally driven. .

  The axle 30 of the added auxiliary wheel 103 is supported so as to be able to move up and down with respect to the vehicle body. Specifically, a support bracket 31 made of two plate-like members is provided so as to protrude downward from both sides of the main frame 10, and a movable arm 32 is pivotally provided at the tip of the support bracket 31. Yes. The movable arm 32 extends rearward from the connection portion 311 with the support bracket 31, and the axle 30 is attached to the tip of the movable arm 32 via a connection hinge 33. With the above configuration, the movable arm 32 rotates about the connecting portion 311 with the support bracket 31 as a fulcrum, and the axle 30 moves up and down in conjunction with the movement of the movable arm 32.

  Between the cross member 11 provided between the left and right main frames 10 and the axle 30, a coil spring 35 urged in a direction to widen the distance between the axle 30 and the vehicle body is provided. A shock absorber 34 is provided between the main frame 10 and the main frame 10. By the coil spring 35 and the shock absorber 34, the distance between the axle 30 and the vehicle body during normal travel is properly maintained.

  The raising means of the auxiliary wheel 103 and the axle 30 of the present embodiment is based on pulling by the wire 44. Specifically, a winding drum 42 formed to be rotatable by a motor 41 is attached to the cross member 11 of the vehicle body, a moving pulley portion 43 is provided on the axle 30, and one end of the wire 44 is attached to the attachment portion 45. The other end is fixed to the take-up drum 42 via the moving pulley 43. Then, when the motor 41 is driven by the hand switch and the take-up drum 42 is rotated to take up the wire 44, the other end of the wire 44 is fixed to the vehicle body, so that the movable pulley 43 is pulled up. At this time, the coil spring 35 is in a compressed state. As a result, the axle 30 is also raised, and the auxiliary wheel 103 is lifted off the road surface, so that it is possible to travel on four wheels excluding the auxiliary wheel 103.

  In order to return the auxiliary wheel 103 and the axle 30 from the raised position to the normal running position, the winding drum 42 is rotated reversely by the motor 41 and the wire 44 is fed out of the winding drum 42. As a result, the upward pulling force is not applied to the moving pulley 43, and the auxiliary wheel 103 and the axle 30 are returned to the normal traveling position before being lifted by the urging of the coil spring 35. In addition, although the electric motor is used in the raising means of the axle 30 of this embodiment, the raising means is not limited to this, and a known means such as a hydraulic cylinder or an air lift can be used.

  Furthermore, a sensor for detecting the height of the axle 30 when the axle 30 is raised to a predetermined height and automatically stopping the winding of the wire 44 by the motor 41 may be provided. As an example of such a sensor 50, as shown in the figure, a lever 51 is provided on the front end side of a member projecting downward from the vehicle body so as to come into contact when the axle 30 is raised to a predetermined height. If the motor 41 is switched off when the motor 30 is pushed up by a certain distance, the ascending operation can be stopped when the axle 30 reaches a predetermined height.

  In this embodiment, the auxiliary wheel 103 is provided behind the rear wheel 102. However, the auxiliary wheel 103 may be provided in front of the rear wheel 102 by inverting these arrangements. In such an arrangement, when the axle 30 of the auxiliary wheel 103 interferes with the drive shaft, a portion that interferes with the drive shaft of the axle 30 may be formed in a U shape to avoid the shaft.

  As mentioned above, although the example at the time of applying the tire raising / lowering structure of this invention to a 6-wheel truck was demonstrated, the application of this invention is not restricted to this, It is a towed vehicle, such as a trailer and a camper which does not have a self-propelled function. The tire elevating structure of the present invention can be applied to those having six or more wheels.

10…… Main frame 11…… Cross member 20…… Axle 21…… Rigid axle case 22…… Leaf spring 23…… Shock absorber 30…… Axle 31…… Support bracket
32…… Movable arm 33…… Connection hinge
34…… Shock absorber 35…… Coil spring 41…… Motor
42…… Winding drum 43…… Dynamic pulley 44…… Wire 45…… Mounting
50…… Sensor 51…… Lever 100…… Car body (cabin)
101…… Body (cargo)
102…… Rear wheel 103…… Auxiliary wheel 311…… Connection

Claims (2)

An axle supported so as to be able to move up and down with respect to the vehicle body, a coil spring biased in a direction to widen the distance between the axle and the vehicle body, and a lifting means for raising the axle with respect to the vehicle body A movable arm pivotally provided at the front end of a support bracket that protrudes downward from the main frame. The movable arm extends rearward, and the axle is connected to the front end via a connection hinge. The lifting means is attached to the vehicle body by a winding drum formed to be rotatable by a motor, a moving pulley is provided on the axle, and one end of the wire is fixed to the vehicle body, The other end of the wire is fixed to the take-up drum via the moving pulley, and when the take-up drum is rotated to wind the wire, the moving pulley is pulled up. Tire lifting structure, characterized in that the axle is increased. The tire ascent / descent according to claim 1, further comprising a sensor for detecting the height of the axle when the axle is raised to a predetermined height and automatically stopping winding of the wire by a motor. Construction.

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