DE4324774A1 - Model motor-cycle - Google Patents

Abstract

In a known model motor-cycle having a freely mounted steering shaft, the front wheel fork pivots, at the level of the steering head bearing, about a shaft which lies parallel to the carriageway and in the direction of travel. Straight travel is problematical and track consistency is poor. The new model motor-cycle is intended to give a visual impression as true as possible to the original. It is intended to be manoeuvrable and consistent in its tracking at high speeds, and must tilt only at very low speeds, if at all. In the new model motor-cycle, the front wheel fork (6) is mounted to be rotatable exclusively in the plane of symmetry of the model motor-cycle (1) and, for the purposes of turning, is functionally connected to a servomotor (12). The front wheel fork (6) is fixedly connected via a plate (29) to a steering shaft (27), which is mounted to be rotatable about the steering axle (5) and, together with the steering axle (5), encloses a space (26). The front wheel is now lighter than hitherto. Nevertheless, because the wheels are always aligned during travel - even at low speeds - better tracking consistency than hitherto is achieved. At high speeds, rapid banking is possible on curves. The oblique position in the curve is not dependent on the height of the centre of gravity. The centre of gravity can thus be positioned lower. <IMAGE>

Description

The invention relates to a model motorcycle with a Frame part, a front and rear wheel, a motor Drive and a steering device for the front wheel.

In a known model motorcycle with a freely stored Steering shaft pivots the front fork at the height of the Steering head bearings around a shaft parallel to the roadway and lies in the direction of travel. As a result, when cornering the Front wheel is not aligned with the rear wheel. That is why the Straight-line problematic and the directional stability bad. On sufficient directional stability can only by a increased weight of the front wheel can be achieved. at higher speed is a quick change of direction by pivoting the steering axle in the opposite Direction not possible.

Especially from the front and when cornering is in the known Model motorcycle given no original appearance. The Front wheel pivots to the inside of the curve for cornering, whereby the center of gravity of the model motorcycle significantly worsened. To focus on one To move cornering to the center of the curve, the Model motorcycle leaning very far. This can also be the Emphasis should not be placed arbitrarily low, because otherwise the angle of inclination would become too great.  

The invention is based on the object, a model motorcycle to create the most faithful appearance possible taught. It should be very agile and fast at high speed be true to the rules and may at most at very low Tilt speed.

According to the invention the object is achieved by the in claim 1 solved features.

The invention has advantages over the known, the advantages that the model motorcycle over previous models, at those for the purpose of cornering the front fork after to swing left and right, a lower one has mechanical effort. Accordingly, the new one has Model motorcycle takes up less space, it is lighter and more compact comes with lower production costs. Especially that Front wheel is lighter than previously possible. Nevertheless, it is by always aligned wheels when driving - even at low speed - better directional stability than before reachable. At high speed, a fast "In Curve-Laying "is possible. The slope in the curve is regardless of the height of the center of gravity. That is why the Emphasis be placed deeper than previously possible was. There is no functional shift of emphasis for a cornering. That is why there is no weight shift in necessary for the model motorcycle. Because of the aligned wheels will also while driving a true to the original look of the Model motorcycle preserved.

Further advantageous embodiments of the invention are intended the dependent claims and the description below out.

The invention is based on an embodiment with reference to a Drawing explaining a side view on a Model motorcycle with the steering device according to the invention shows.  

A model motorcycle 1 with a drive motor 11 essentially consists of a frame part 2 , a rear wheel 16 mounted on one end thereof, a steering device 4 provided on the other end of the frame part 2 and a front wheel 17 mounted on the frame part 2 via the steering device 4 .

The frame part 2 consists of two symmetrically and mutually parallel parts, which are connected at one end via a sheet metal bracket 35 and at the other end between them the fork-shaped rear wheel 16 with a pulley 15 fixedly attached thereto. On the frame part 2 of the drive motor 11 in a designated holder 32 , for example, transverse to the direction of travel of the model motorcycle 1 , mounted. A belt 13 forms a functional connection between a roller 14 fixed on the shaft of the drive motor 11 and the pulley 15 on the rear wheel 16 .

The rotational speed of the drive motor 11 is controlled via a travel controller 19 . The drive motor 11 and the cruise control 19 are supplied from an accumulator 18 with electrical energy. Belts 33 hold the accumulator 18 and the cruise control 19 on the frame part. 2 The accumulator 18 is arranged as the lowest component so that the center of gravity of the model motorcycle 1 is as low as possible.

On the sheet metal bracket 35 at the front wheel side end of the frame part 2 , two spars 7 are fixed, which are inclined from the vertical. They serve to attach an upper yoke 30 and a lower yoke 31 . The yokes 30 , 31 carry the steering device. 4

The steering device 4 consists essentially of a steering shaft 27 , a non-rotatably connected gear 9 and a fixed to the lower yoke 31 servo motor 12 , the pinion 10 meshes with the gear 9 .

The servomotor 12 is connected via electrical lines 8 to a servo electronics 21 , which is in functional communication with the travel controller 19 , a receiver 20 and the accumulator 18 . The receiver 20 is in radio frequency communication with a transmitter (not shown in the drawing). The servo electronics 21 controls the electric current through the servomotor 12 direction and size depending on the Lenkknüppelstellung the transmitter. With increasing billet deflection of the electric current through the servo motor 12 is larger, the direction of current is dependent on the direction of deflection of the steering stick - from its zero position.

The steering shaft 27 is rotatably mounted in two mutually axially offset steering head bearings 25 , wherein the lower end of the steering shaft 27 via a plate 29 at a distance 26 fixed to the dip tubes 28 of the front fork 6 is in communication.

The caster 24 , so the distance between the vertical axis passing through the front axle 34 , where it reaches the bottom 23 , from the intersection of the steering shaft 5 with the bottom 23 generates a self-steering torque when cornering on the front fork 6 . It is always directed so that a tilting tendency of the model motorcycle is intercepted by steering in the direction of tilt.

For the purpose of cornering a torque is transmitted from a servomotor 12 via a steering gear 3 as a steering torque to the steering axle 5 . It acts on the steering axle 5 of the model motorcycle 1 on the front axle 34 in or against the direction of the rotary arrow 22nd The steering torque is directed against the steering direction of the driven curve. The model motorcycle tilts to the center of the driven curve. This creates a self-steering torque, which counteracts the outgoing from the steering gear steering torque and brings the front axle for steering in the curve.

An embodiment of the model motorcycle according to the invention in the scale 1: 8 compared to an original motorcycle was with created the following data:

Overall length | 225 mm height 145 mm width 65 mm Total weight with battery 700 g Rear wheel diameter 86 mm Front wheel diameter 76 mm trailing 28 mm top speed 30 km / h

This results in a ratio of 5: 1 (Gear: pinion) reduce steering gear a maximum Steering torque of 0.3 Ncm.

Claims (5)

1. model motorcycle with a frame part, a front and rear wheel, a motor drive and a steering device for the front wheel, characterized in that the front fork ( 6 ) is rotatably mounted exclusively in the plane of symmetry of the model motorcycle ( 1 ). 2. model motorcycle according to claim 1, characterized in that the front fork ( 6 ) for the purpose of rotation with a servomotor ( 12 ) is in functional communication. 3. model motorcycle according to claim 2, characterized in that on the steering shaft ( 5 ) fixedly mounted gear ( 9 ) with the on the drive shaft of the servomotor ( 12 ) fixedly connected pinion ( 10 ) meshes. 4. model motorcycle according to one of claims 1 to 3, characterized in that the front fork ( 6 ) via a plate ( 29 ) fixedly connected to a steering shaft ( 27 ) which is rotatably mounted about the steering axis ( 5 ) and the front fork ( 6 ) with the steering axis ( 5 ) includes a distance ( 26 ). 5. model motorcycle according to one of claims 1 to 4, characterized in that the steering head bearing ( 25 ) for the steering shaft ( 27 ) via an upper yoke ( 30 ) and a lower yoke ( 31 ) are fixedly connected to spars ( 7 ), which are in turn attached to a frame part ( 2 ) of the model motorcycle.