FR2634448A1 - Suspension system with linear guidance for a vehicle - Google Patents

Abstract

Suspension device for a rolling vehicle, in particular cycles and motor cycles, and transmisson of the torque to all the wheels. The invention consists in eliminating the variations in load on the tyres during the deflection of the wheels, and by its design allowing all the wheels to be motorised. It consists of a chassis 1, of linear suspension 2 and 4 which allows a constant torque to have a constant load on the wheel despite the deflection of the wheels, of which the stub axles 3 and 5 are so close to the suspended chassis 1 that the transmission of the torque to all the wheels is possible. The device according to the invention is particularly intended for cycles and motor cycles.

Description

 The present invention relates to the design of the rear and front suspensions of a land vehicle, with two or more wheels, allowing better control of the forces, at the level of the support of the tires by bringing to the ground, due to the drive torque for the drive wheel, and kinetic energy, when braking, for the front wheel.

 The technique usually used is a telescopic fork at the front and an oscillating arm at the rear. The first with its hunting angle of twenty to thirty degrees often sags too much during braking, the second, by its angular variation causes, for constant engine torque, variation of the wheel bearing force on the ground and crushing of the shock absorber.

 The device according to the invention makes it possible to remedy these drawbacks. In fact, the suspension device, rear or front, consists of a linear deflection of the wheel stub, at an angle with the perpendicular to the ground, calculated to saturate the grip and wear requirements of the tires. The linear deflection removes to simulate an angular deflection with an arm whose length tends towards infinity and angular variation which tends towards zero, which has as a consequence, for a constant engine torque or constant braking, to have tire forces on the ground constant (in the case of a chain transmission there will remain the variation due to that of the stretched strand of the chain).

 According to a preferred embodiment, the displacement will be a linear guide produced close to the axes of the wheels, with additional rotational guidance for the front wheel, allowing it to turn. This allows to have a rigid chassis with an axis to the other and therefore to have the possibility of transmitting the engine torque to the two wheels, the front and the rear by cardan shafts.

 Figure 1 shows the device follow the preferred embodiment, in perspective with a single drive wheel.

 Figure 2 shows the same device as Figure 1 but with two driving wheels.

 Figure 3 shows the same device with a chain transmission.

 the device shown in Figure 1 has a rigid frame (1) on which is the linear guide (2) of the rear wheel stub (3), and the linear and rotating guide (4) for the front wheel stub ( 5).

 In the embodiment of Figure 2, the system is identicue but the engine torque is transmitted to the two wheels.

 In the embodiment of FIG. 3, the transmission takes place by chain.

 the suspension system intended to eliminate the variations of forces applied to the wheels resting on the ground is characterized in that a chassis (1) is rigid from one wheel axle to another wheel axle and that the guiding devices (2) and (4), supporting the wheel spindles (3) and (5), are linear and are found as close as possible to these axes. The number of wheels guided for a frame is not limited.

 The wheels, or wheel spindle, can also have a controlled rotation guide, for maneuvering the vehicle.

The axis around which this guidance will be done may be different or coincident with the axes of the linear guides or wheel axis.

 The driving power can be transmitted to one or more wheels, in particular in the case of motorcycles, by any transmission system accepting three degrees of mobility for a transmission to a steering wheel, and two degrees of mobility for a transmission to a wheel not guiding, the degree of mobility, motor rotation, understood.

Claims (3)

 1) System of suspensions intended to eliminate the veriations of forces applied to the wheels resting on the ground, characterized in that a chassis (1) is rigid from one wheel axle to the other and that the  guide devices (2) and (4), supporting the rocket wheels (3) and (5), are linear and are read near these axes. The number of wheels guided a chassis is not limited.  2) System according to claim 1 characterized in that cue xix wheels, or wheel hub, can also have a controlled rotation guidance, for the maneuvering of the vehicle. The axis around ducuel is this guidance to be different or confused with the axes of the linear guides or axis of -ow.  3) System according to claims 1 or 2 characterized in that the driving power can be transmitted to a cu several wheels, in particular in these motorcycles, by any transmission system accepting three degrees of mobility for a transmission to a steering wheel, and two degrees of mobility for a transmission to a non-steerable wheel, the degree of mobility, including driving rotation.