Land vehicles – Wheeled – Running gear
Reexamination Certificate
1999-04-19
2001-02-27
Culbreth, Eric (Department: 3611)
Land vehicles
Wheeled
Running gear
C267S223000, C280S124100, C280S124134, C280S124154, C280S124157
Reexamination Certificate
active
06193251
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an automotive suspension system, and more particularly, to an improved automotive suspension system which is capable of moving the center of the junction thereof upon the application of shock and swing to an automotive frame. In addition, the present invention is directed to an automotive suspension system which can exert both shock absorption and anti-swing functions against slight external shock and swing by the resultant forces between the components connected to the center of junction thereof, thereby facilitating the running and turning of a vehicle in a stable manner.
BACKGROUND ART
A conventional automotive suspension system is disclosed in U.S. Pat. No. 4,960,291, which is based upon a conventional MacPherson strut type suspension system and is provided with two shock absorbing hydraulic cylinders, each having different inner piston diameters. The suspension system operates to absorb shock and provide anti-swing protection against the application of shock or swing on an automotive frame, by using a hydraulic fluid piping system and a sensing device. However, it has been noted that since the conventional suspension system includes a hydraulic fluid piping system, a hydraulic controller and a sensing device which are manufactured in a complicated manner, there frequently occurs some problems in that unexpected failures of the components are experienced. The repair of these components is not easy to achieve and the cost of maintenance is very high.
FIG. 1
is a perspective view of a conventional MacPherson strut type suspension system, which is widely used in a vehicle. To improve the stability of the running of the vehicle, however, there is a need to develop a novel automotive suspension system which is structured with complete shock absorption and anti-swing functions in order to remove the restrictions on the mechanical structure of the conventional suspension system.
To this end, in the preferred embodiment of the present invention, there is provided an improved automotive suspension system which is designed with the combination of a plurality of hydraulic cylinders with a rigid suspension rod in a predetermined manner in the conventional MacPherson strut type suspension system, for improving the shock absorption and anti-swing efficiencies. For example, if a slight shock or swing is applied to a vehicle, the conventional MacPherson strut type suspension system is not responsive to such an applied shock or swinging means. However, the automotive suspension system according to the present invention can be readily responsive thereto. Also, if a heavy shock or swing is applied to a vehicle, the automotive suspension system according to the present invention includes an additional shock absorber as well as the existing shock absorber for responding to such a shock or swing.
Therefore, the present invention is directed to an automotive suspension system which has the functions of absorbing the shocks applied due to the continuous irregularities of the surface of the road and eliminating the swing generated by the centrifugal force produced during the turning of a vehicle.
DISCLOSURE OF INVENTION
An object of the present invention is to provide an improved automotive suspension system which is designed with a new mechanical structure which operates against a slight shock or swing, by using a plurality of hydraulic cylinders and a rigid suspension rod in a conventional MacPherson strut type suspension system.
Another object of the present invention is to provide an improved automotive suspension system which can maintain the distance between an automotive frame and the axle of a wheel each connected thereto at a constant height, upon the generation of a slight shock or swing against the automotive frame.
Still another object of the present invention is to provide an improved automotive suspension system which comprises an additional shock absorber with shock absorption and anti-swing functions which are used in addition to the an existing shock absorber contained in a conventional MacPherson strut type suspension system thus, when an external shock is applied to an automotive frame, the running and turning of a vehicle in a stable manner is facilitated.
To achieve these and other objects according to the present invention, an automotive suspension system is provided which is rotatably connected between the wheel axle and an automotive frame. The automotive compressor system comprises a first hydraulic cylinder having a relative small inner diameter and attached, in a length direction, to be integrated with an improved MacPherson strut type shock absorber, made by shortening the length of an existing MacPherson strut type shock absorber and reinforcing the compression force of the spring thereof. A bottom end portion of a first hydraulic cylinder is combined with a top end portion of a second hydraulic cylinder, having a relative larger inner diameter than the first hydraulic cylinder, and a bottom end portion of a rigid suspension rod, respectively, at appropriately defined combining angles. The combined elements are rotatably connected to each other, the second hydraulic cylinder having a bottom end portion connected with the axle of a wheel, and the suspension rod having a top end portion connected with the automotive frame. The improved MacPherson strut type shock absorber has a top end portion connected with the automotive frame, the top end portion of the suspension rod being installed to be disposed higher than the horizontal position of the center junction of the combined portions and attached toward the inward direction of the automotive frame. The improved MacPherson strut type shock absorber being is adapted to be attached between the first and second spring fixing boards to allow a first coil spring to be inserted thereinto and separated. The first hydraulic cylinder is adapted to be attached between the second spring fixing board and a third spring fixing board to allow a second coil spring having a relative smaller compression force than the first coil spring to be inserted separated. A thereinto and therefrom; a flexible hydraulic hose is provided for connecting the first and second hydraulic cylinders to move oil pressure toward each other. First and second oil inlet holes, respectively, are formed on the external surfaces of the first and second hydraulic cylinders, each oil inlet hole having a locking device thereon. At least two or more supporting members for rotation prevention respectively are attached to the external surface of the second hydraulic cylinder for use upon the application of heavy a strong shock or swing to the automotive frame.
REFERENCES:
patent: 4960291 (1990-10-01), Lin
patent: 3835225 (1990-04-01), None
patent: 3909942 (1990-09-01), None
patent: 4002059 (1991-01-01), None
patent: 0029289 (1981-05-01), None
Birch & Stewart Kolasch & Birch, LLP
Culbreth Eric
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