FIELD OF INVENTION:
The present invention relates to the field of stabilizer link for a vehicle suspension. More particularly the present invention relates to a stabilizer link and methods to improve the stability to vehicle by reducing the axial motion of the ball stud to prevent rolling.
BACKGROUND AND PRIOR ART:
Generally, a suspension' system of a vehicle is an important system for enhancing ride comfort and driving stability. Such a suspension system stably supports a vehicle body from wheels and reduces vibration delivered from the wheels. The suspension systems of automotive vehicles today comprise stabilizer links which are arranged between the vehicle chassis and the suspension of each wheel. These links are usually formed by a tubular-shaped element incorporating respective housings at its ends for the assembly of articulations, usually rubber bearings or ball joints.
Recently, various types of suspension systems have been developed and applied to vehicles which have different configurations according to each, specific application, aUhough these elements usually have a series of requirements that are common for all of them, which include having a determined torsional strength, having the lowest weight possible, allowing the fastest assembly possible and having the lowest cost possible.
Publication No. K:R20100035212 (A) relates to a vehicle stabilizer link comprising a tube, a ball stud, a ball seat and a fixing ring. The tube is respectivjely installed at both ends of a rod.
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-3-The ball stud is connected to the tube to constitute a ball joint. The ball seat is installed in the tube to enable the ball of the ball stud to be situated. The fixing ring is connected to the ring coupling groove of the ball seat. The fixing ring securely fixes the ball seat on the tube.
Publication No. JP2013002597 (A) relates to a stabilizer link capable of simplifying the structure of a tool for mounting a mold onto a sub assembly and effectively preventing leakage of resin to the outside, and to provide a method of manufacturing the stabilizer link.
Publication No. KR20120021839 (A) relates to a strut mounting-type stabilizer bar device comprising a stabilizer link and a stabilizer rod. The stabilizer link crosses breadth of a car and supports to a lower arm.* One end of the stabilizer rod is coupled to the end of the stabilizer link by a ball joint. The other end of the stabilizer rod is coupled to a strut by a ball joint. The stabilizer rod is delivered torque of the strut through the ball joint of the strut in order to rotate. The stabilizer rod comprises a top rod bar, a bottom rod bar, and a ring bearing.
Publication No. JP2008265355 (A) relates to a stabilizer link SL as a composite member having an arm member and ball joints. The arm member is form.ed in a cylindrical shape. A shaft-like fitting part and. a connection part are formed on the ball joint. A groove part is formed in an annular shape on an outer circumferential surface of the fitting part. An 0-ring for sealing the cylindrical part of the arm member is fitted in the groove part.
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-4-Publication No. WO2013008971 (Al) relates to a stabilizer link, and a method for manufacturing same, and more particularly after the stud end of the plastic ball bearing for rotatably supporting a part which is heated to melt by pressure in the press is coupled to the outer tube and a plastic bearing relates to a sealing performance and to enhance the rigidity of the stabilizer.
Publication No. CN202727904 (U) relates to a hanging frame control arm ball pin rod which comprises a ball pin rod. A first limit boss used for clamping and controlling a neck portion of a dust-proof cover of an arm ball hinge assembly, a second limit boss is fiarther arranged above the first limit boss on the ball pin rod, and a groove used for clamping and controlling the neck portion of the dust-proof cover of the arm ball hinge assembly is formed between the first limit boss and the second limit boss.
Publication No. CN201636325 (U) relates to a dustproof sealing structure of an automotive steering and suspension ball pin assembly, which comprises a dustproof cover with the upper end concave inwards to form a reducing end, the neck of a ball pin is provided with groove, and the reducing end of the dustproof cover is tightly clamped in the groove.
Publication No. CN201129354 (Y) relates to a ball joint assembly, which mainly comprises a ball joint and a ball joint cover, wherein a ball joint cover groove group is uniformly distributed on the ring-shaped.wall of the ball joint cover.
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-5-Publication No. DEI02008005295 (Al) relates to a race having a structure ring manufactured from metal or plastic, where the structure ring is coated with a sealing layer of a rubber-like material at an itmer side.
Publication No. CN103350625 (A) relates to a ball pin assembly for a suspension system, belonging to the technical field of motor vehicle components. The ball pin assembly comprises a ball pin and a control arm, wherein the ball pin comprises a ball head and a rod part, the ball head of the ball pin is sheathed in an installation groove of the control arm, an end cover seal is arranged at the lower end of the installation groove, a non-metal buffer layer is arranged between the ball head and the inner wall of the installation groove, and a protective sleeve is sheathed outside the rod part of the ball pin.
Publication No. CN103375481 (A) relates to a ball joints with dust cover. The product is made of elastic material, and a ball head part formed at one end of the ball pin is maintained in the base, and a spindle at the other end of the ball pin is screwed and fixed at a knuckle, and one end of the section in reversed n shape with large diameter opening part is fixed and maintained in an annular groove formed on the periphery surface of the base by an annular press ring, and the other end with small diameter opening part is maintained on the spindle.
Publication No. CN201874343 (U) relates to a U-shaped double-bolt automobile . steering wheel lock beam, which comprises a beam body provided with a lock cavity, at least one pair of spaced bolts and a lock hole. The lock cavity is provided with an opening; the bolts form a U-shaped lock groove, and the size of the U-shaped.lock groove adapts tojthat ot'a steering wheel spoke column.
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Every dust cover changes its shape & size with time as it is elastomer material. This change in shape give small openings to dust & mud entry at extreme oscillation angle due to lopsided shape that start deterioration of ball joint over a time leads to pre mature failure. This happens due to material characteristic. The phenomenon varies with the type of material & expertise of manufacturer which is directly proportionate to cost. Though the solution lies with the change in material of duct cover with increase in cost which no customer wants as increase in value of product is not good by increasing cost.
However, in the prior art systems, the dust cover lip become oval on extreme oscillation angle give way for dust & water entry with laps of time which leads to warranty return. Thus there was no locking feature to avoid dust & water entry. Additionally, 90 deg ordinary lip profile allows water entry with oscillation angle.
This invention is focused on improving value of the product by improving function without impact on cost. To improve the life of ball joint significantly by altering the dust cover features, by changing the ball pin feature & locking feature by changing in coiled boot ring. The combination of all these unique features are not allowing even the entry of mist inside ball joint hence eliminated the deterioration of the ball joint by foreign particles.
Thus the present invention provides improvements to ensure that the dust cover can protect the ball joint against water entry, which in the previous design iterations were impossible to achieve, with complete reliability.
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-7-The invention with new features incorporates several changes, which results significant improvements in terms of avoiding moisture and vapor entry into the ball joint assembly, via the dustcover mouth.
OBJECTS OF THE INVENTION:
The principal object of the present invention is to provide a stabilizer link to improve the stability to vehicle by reducing the axial motion of the ball stud to prevent rolling.
Another object of the present invention is to provide dust cover in the assembly to ensure no dust and moisture gets in the ball joint.
Another object of the present invention is to provide uniform interference at extreme oscillation angle to avoid dust & water entry as there is positive locking all around.
Yet another object of the present invention is to provide groove on ball pin neck ■to retain dust cover firmly.
Still another object of the present invention is to provide coiled ring stretchable as per load requirement provide positive lock to avoid dust & water entry.
BRIEF DESCRIPTION OF THE INVENTION:
Accordingly, the present invention provides a stabilizer link for vehicles having an additional coiled boot ring at the niouth of the dust cover and a lower collar in tlie ball pin, creating a groove for the dust cover mouth to be placed..
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-8-The invention further incorporates changes in both the inner and outer profile of the dust cover mouth. Thus the invention provides uniform interference at extreme oscillation angle to avoid dust & water entry as there is positive locking all around.
In a preferred embodiment of the present invention, a stabilizer link for vehicles having an additional coiled boot ring at the mouth of the dust cover and a lower collar in the ball pin, creating a groove for the dust cover mouth to be placed.
In another embodiment of the present invention, ball pin neck groove profile has an additional lower collar to provide the dust cover additional support, securing the dust cover mouth onto the groove, by preventing lateral movement.
In another embodiment of the present invention, the dust cover has 30 deg special lip profile which throv/ water out with oscillation angle.
In another embodiment of the present invention, the additional coiled boot ring stretchable as per load requirement provides positive lock to avoid dust & water entry.
BRIEF DESCRIPTION OF THE DRAWINGS
it is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments.
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-9-Fig. la and lb show the existing stabilizer link design available in prior arts and its exaggerated view;
Fig. 2a and 2b show the stabilizer link design according to the present invention and its exaggerated view;
Fig. 3a and 3b show ball pin available in prior art systems and according to the invention respectively;
Fig. 4a and 4b show dust cover design available in prior art systems and according to the invention respectively;
Fig. 5a and 5b shows the dust cover lip profile available in prior art systems and according to the invention respectively; and Fig. 6 shows the coiled boot retainer ring according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
In accordance with the objectives of the present invention, the invention provides significant improvements in terms of avoiding moisture and vapor entry into the ball joint assembly, via the dustcover mouth.
Referring to the fig. la and lb, the existing design of stabilizer link in prior arts comprises ball pin (1), dust cover (2), dust cover housing (3), pressing (4), lower ball seat (5), upper ball seat (6) and retainer ring (7). The stabilizer link has a single collar at the end of the neck of the ball stud which acts as the stopper to prevent upwards slippage of the dust cover mouth, onto the taper of the ball stud, which might lead to openings between the dustcover mouth and the ball stud surface. However, since the dust cover mouth was not restricted by anything, during extreme oscillation the mouth of the dust cover could shift down, and the opening could become lopsided due to ball pin movemeni: or revolutions.
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-10-This could lead to minute gaps which allowed entry of moisture and vapors, as well as dirt. The vapors and moisture can cause micro dirt to enter into the ball joint causing wear. The moisture overtime can cause rusting in the ball pin. The increased water content can lead to the diluting of the grease and increase the friction wear of the part. The dust leads to wear in the ball joint impairing the function of the ball joint.
Referring to fig. 2a and 2b, the stabilizer link for vehicles according to the present invention comprises ball pin (1), dust cover (2), dust cover housing (3), pressing (4), ball seat (5), retainer ring (6) and a coiled boot ring (7). The present invention provides an additional coiled boot ring 7 at the mouth of the dust cover 2 and a lower collar in the ball pin 1, creating a groove for the dust cover mouth to be placed. The invention further incorporates changes in both the inner and outer profile of the dust cover mouth 2.
As stated, the changes ensure that the moisture or vapors do not penetrate through the dust cover into the ball joint assembly, thus elirninating the rusting and wear within the ball joint with leads to failure of function.
Fig. 3a and 3b show ball pin available in prior art systems and according to the invention respectively. Ball pin neck groove profile as shown in fig. 3b, has an additional lower collar to provide the dust cover additional support, securing the dust cover mouth onto the groove, by preventing lateral movenient. The dust cover has an adjacent profile, as shown in fig. 2a and 2b, corresponding to the profile of the ball pin groove, which is secured in place by an interference fit.
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This prevents any and all, lateral and lopsided motion of the ball seat mouth ensuring that there is no opening at any time, under any condition.
Fig. 4a and 4b show dust cover designs available in prior art systems and according to the invention respectively. Fig. 5a. and 5b shows the dust cover lip profile available in prior art systems and according to the invention respectively. The dust cover has under gone two major changes in its profile. The first would be the addition of a groove on the outer profile for the coiled boot ring to be placed, marked by red in figure 5b. The second, is the addition of a stepped lip profile, designed at an incline angle of 30°, which, during the movement of the ball pin, compresses and throws out the moisture. Additionally, the 3 step profile ensures that in an event of failure of the first profile step, the acute angles of the step would immediately restrict the water entry to the first step, ensuring that the ball joint stays dry. Hence, fool proofing the mechanism against forced moisture and vapor entry.
Fig. 6 shows the coiled boot retainer ring additionally provided according to the present invention. The retainer ring is made of unique design ensuring a uniformly distributed radial force exerted on the mouth of dust cover, sealing of the feature, making it an airtight case.
ADVANTAGES
1. Design of the duct cover lip at inclined angle in such a way that with each oscillation stroke it throw the water & moisture out of ball joint
2. Design of the coiled boot ring size such a way that it does not loose its stiffness in expansion condition during fitment & exert optioium radial
force all around which does not allow any lopsided shape to dust cover even at extreme oscillation angle.
3. Design of the Ball pin groove lower edge with radius which act as secondary lock with dust cover & inhibit entry of moisture below that area & further tighten grip at extreme oscillation angle.
4. Ball joint performance improved by 10 fold.
5. It passes the muddy water test 5 million cycle compare to conventional design which pass 0.5 million cycle.
Numerous modifications and adaptations of the system of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover ail such modifications and adaptations which fall within the true spirit and scope of this invention.

WE CLAIM:
1. A stabilizer link-for vehicles comprising ball pin (1), dust cover (2), dust cover housing (3), pressing (4), ball seat (5), retainer ring (6), coiled boot ring (7) characterized in that a coiled boot ring (7) is provided at the mouth of the dust cover (2) having a stepped lip profile and a lower collar in the ball pin (1) creating a groove for the dust cover mouth to be placed properly.
2. The stabilizer link for vehicles as claimed in claim 1 wherein the ball pin neck groove profile has an additional lower collar to provide the dust cover additional support, securing the dust cover mouth onto the groove, by preventing lateral movement.
3. The stabilizer link for vehicles as claimed in claim 1 wherein the dust cover has a groove on the outer profile for the coiled boot ring to be placed and an inner stepped lip profile.
4. The stabilizer link for vehicles as claimed in claim 1 wherein the dust cover has 30 degree stepped lip profile to throw water out with oscillation angle.
5. The stabilizer link for vehicles as claimed in claim 1 wherein the additional coiled boot ring placed on dust cover groove is stretchable as per load requirement and provides positive lock to avoid dust & water entry.