Bearings – Rotary bearing – Plain bearing
Reexamination Certificate
1999-05-13
2001-04-10
Footland, Lenard A. (Department: 3682)
Bearings
Rotary bearing
Plain bearing
C384S909000
Reexamination Certificate
active
06213647
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a bearing used in vehicle steering device, and more particularly relates to a damping thrust bearing for steering knuckle.
BACKGROUND OF THE INVENTION
In prior art steering device for vehicle and wheel engineering machine, in order to make the vehicle and the engineering machines to steer or revolve flexibly and smoothly within the scope of load, ball bearings or roller bearings are often used as the steering knuckle or steering revolving shaft. The rigidity of prior art bearings is very high, consequently, the bearing performances for absorbing impact energy, resisting erosion and lubricating effect are poor. Since the steering knuckles always run in a cantilever status, the force exerting on thrust bearing focuses on the side near the tire, consequently the ferrule on the same side and a few rolling bodies bear most load, and lead to partial plastic distortion and form concave holes. In addition, thrust bearings always bear strong impact, while excessive impact may distort the contact point between ferrule and rolling body partially and form concave holes. During most driving time, a vehicle does not turn round, when the thrust bearing is static, some concave holes (i.e. vibration traces) may form at the contact points due to the vibration around. These concave holes are produced by the recurrent minute sliding distortion and abrasion at the place of high contact stress between rolling bodies and rolling contact surface. Besides, water and moisture permeates the thrust bearings, which will produce rusts and pocks on the surface of the ferrule and sliding bodies, and make the sliding path in wave form. When steering tires roll on the ground, these partial concave holes and abrasions make them sway violently in the axis direction and have sliding friction with the ground. Then the tires stand great force and may change their direction. The fierce resonance produced by the steering system prevents the vehicle from normal running, causes quick abrasion of tires, and even engenders traffic accidents. Meanwhile, it will aggravate the grinding of the ground and shorten the ground life. In order to solve the problems, the following measures are employed on the vehicles: using tires with shorter diameter or wider tire, increasing the rigidity of front bridge, practicing independent suspension, using damping stabilizer, etc, but the effect has been proved very little.
SUMMARY OF THE INVENTION
One of the objectives of the present invention is to provide a damping thrust bearing for vehicle steering knuckle, which is abrasion and erosion resistant, absorbs impact energy and has high damping effect against vibration.
Another objective of the present invention is to provide a damping thrust bearing for vehicle steering knuckle, which is impact-erosion resistance and dust-water proof.
Further objective of the present invention is to provide a damping thrust bearing for vehicle steering knuckle, the bearing is self-lubricated and absorbs impact energy.
A damping thrust bearing for vehicle steering knuckles of this invention comprises two ring-form objects with the same inner hole diameter and outer diameter, a ring-form object is a damping ring, made of materials of low friction factor and strong impact-resistance;
a ring-form object is a thrust ring;
the lateral ring-form surface of said damping ling has a sliding connection with the lateral ring-form surface of said thrust ring, so as to form a friction pair with sliding working surfaces;
a shell, installed outside the friction pair formed by said damping ring and said thrust ring, making the thrust bearing an integral thrust bearing.
Further objectives and advantages of this invention will appear from the following description and the accompanying drawings.
REFERENCES:
patent: 5277500 (1994-01-01), Keck
patent: 5664890 (1997-09-01), Nowak et al.
Footland Lenard A.
Lowe Hauptman & Gilman & Berner LLP
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