DE2040330A1 - Polymer-containing composition for repairing ball joints and axle bearings - Google Patents

Description

The invention relates to means for repairing ball joints, ball bearings, axle bearings and other bearings by In use have been worn out without the bearings being taken apart or need to be removed from the vehicle or from the machine.

As is well known, bearings _f be prepared in the manner that a bearing material in liquid form is injected to the space between a shaft and a bearing housing or cast "For this purpose, metals with a low melting point, were z # G" Babbit metals or plastics, synthetic resinous compositions or even polymers themselves

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used, as for example in the American patents Hr “2 917 334 | 2 919 15Oj 2 954 992 | 3 091 486 and 2,970,869. As far as the applicant is aware, it has not previously been possible to repair bearings and joints in this way while they were at the point of use. Such worn joints and bearings have so far been eliminated and replaced by new components.

The invention provides means for repairing worn ball joints and journal bearings gate, i.e. those bearings in which a shaft rotates in a bushing and the repair can, if desired, be carried out without removing the bearings from the vehicle or to remove the machine. In the case of ball joints or ball bearings, the worn bearings are lubricated with grease according to the invention, since this is not already the case, after which the Bearing parts are held in such a way that »there is the greatest possible clearance between the worn parts. According to this, at least a partial seal between the ball and the socket or the relevant part of the bearing housing at the point of contact is made between the open end of the housing and the ball, and there is one in the space between the parts of the bearing A hardenable plastic bearing composition is injected, displacing the grease and loose pieces of worn bearing material at the same time. Furthermore, the hardening of the storage material composition is initiated, and during the hardening the position of the bearing parts to one another is maintained. at Axle bearings in which the inner or rotating part is in the middle of the outer part or the housing the inner part is appropriately aligned and stored in the outer part, after which the storage composition in the space between the inner and outer parts injected and a bushing is produced. The inner or rotating part of the bearing should also be lubricated before the bearing composition is injected. Before injecting the bearing composition, one or both ends of the bearing are covered, if necessary, so that the storage composition in the space between the inner and outer parts of the Camp is withheld. The hardening of the storage composition can be initiated in the same way as it is

1 0 9 f <0 '■! /! b 9 7 BAD ORIGINAL,

Repair τοη ball joints.

The invention also relates to a curable liquid or liquefiable plastic storage composition, which can be injected through a grease store into the storage space between moving parts, with a substantial one The characteristic is that the material in the liquid state is no less when injected into the space between the bearing parts is more viscous than the lagerfeti and in cone penetration tests Values τοη 200-500, and that the material is resistant to static and dynamic after curing Loads of the order of not less than «17» 5 up to 35 kg / cm. The material must also be suitable for Ball Joint® as in U.S. Patent 2,954,992 disclosed.

Clay the plastics that turn out to be storage compositions suitable are thermoplastic and under the action of heat hardening resins as well as suitably compression-resistant elastomers either alone or as binders to vary the amounts of metal powders, dry lubricants, reinforcing fibers and the like · For many purposes, well cured, high molecular weight polymers can be used to make suitable bearing surfaces * for The purposes of the invention are mixtures of resins and elastomers proved to be particularly well suited.

As plastics, which in the compositions according to the invention, are particularly useful, are listed »Polytetrafluoroethylene, P ^ oIy (chlorotrifluoroethylene), polyamides, epoxy resins, Pheno-formaldehyde, polyurethanes, polysulphide rubber, silicone elastomers and the same.

According to the invention, the plastics can contain additives. These can consist of metal powders or flakes, e.g. of molybdenum, aluminum, copper, iron, bronze powders and like that. Solid lubricants can also be used, z-B · graphite powder, polytetrafluoroethylene powder, finely divided Molybdenum disulfide, carbonized cellulose fibers, waxes with a high melting point and the like. The composition

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may also contain liquid lubricants such as oils, thickened oils or fats. Can be used as reinforcing fibrous additives nylon fibers, cotton fibers, glass fibers and the like are used. Glass fibers increase the compressive strength of the cured bearing composition, as do metal flakes.

Bach the teachings of the invention, the selected Lagerzusaamensetzung at normal temperatures be liquid, and with the use of epoxy resins for example, _o a particularly Aushärtungemittel is provided. The selected components (resin and curing agent) are mixed together with an additive immediately before injection into the bearing to be repaired, after which the mixture is injected into the bearing before curing has progressed so far that the viscosity increases excessively. On the other hand, thermoplastics are heated until they melt or liquefy and then injected into the bearing. Latent systems which harden under the action of heat can be used as one-part systems, for example latent epoxy resin systems, unsaturated polyester systems and the like. If only a small amount of the thermoplastic material is to be injected, the metal parts of the bearing may have to be heated beforehand before the thermoplastic material is injected in order to prevent the bearing composition from hardening prematurely Foreign bodies were washed out of the warehouse.

Old grease or residues of the worn original storage material do not need to be removed without any restrictions. is the worn bearing is practically grease-free (dry), so it is lubricated before starting the repair. Surprisingly, the presence of grease in the bearing cavity hinders the repair not but instead supports the achievement of a pure document for the warehouse management team to be introduced later. At the same time, the grease on the ball or on the shaft itself seeks to adhere the injected bearing composition to the ball or on the shaft to prevent the material from sticking to these

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Bodies need not be detached before the joint or the warehouse is put back into operation.

When using two-part systems, it has proven advantageous to pour the material into a can with separate compartments which contain a curing agent and, for example, an epoxy resin. Immediately before use, the two compartments are contacted and the contents mixed thoroughly. Thereafter, the required amount of the mixture by means of a "grease gun ^w in the joint or pressed in the bearing. The unused material is removed and eliminated from the tool.

The present invention will now be described in detail. The enclosed single drawing shows a partly as Sectional side view of the ball joint on the control linkage of a motor vehicle.

As can be seen from the drawing, a ball member 2 is on a control arm 1 and a socket member is on a control arm 4 5 attached with a locking member 6. Furthermore, a seal 8 is provided for the lubricating grease. A channel 10 performs a grease nipple 12 and through the socket member 5 to the storage room between the ball and socket member »The original bearing material is shown at 18 · As shown in the drawing can be seen, the storage room is with the help of a tool extended to the largest volume, until the securing link 6 with the lower part of the spherical link in contact.

The tool shown in the drawing for separating the parts need not always be needed when the vehicle is designed in such a way that when the body is lifted, the Baths are relieved of the weight of the vehicle so that the bearing parts can take the correct position. Are the joints are spring-loaded, it is sufficient to carry out the bearing repair work inject until the spring tension has been increased significantly.

According to the method according to the invention, the storage room is used through the channel 10 filled with a conventional bearing grease if the worn joint was found not to have any

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Grease contains more · Through the channel 10 a liquid plastic bearing composition, the viscosity of which is not less, then becomes is pressed into the storage space as that of the lubricating grease by means of a device (not shown), a repair bearing 20 being created Cylinder for the plastic storage composition, a piston mounted in the cylinder with which the plastic composition is pressed into the joint, a suitable nozzle and a threaded fitting on the nozzle, which briefly attaches to the socket member the place where the grease nipple 12 is attached · The grease nipple 12 is removed and in its place the threaded nozzle of the filling device is screwed in. During the injection of the plastic bearing composition, the grease from the joint is in the tree between the seal 8 and displaced from the spherical link. If the ball joint is full, which state is noticeable by a significant increase in pressure is, the tool is removed and the repair bearing assembly 20 is then allowed to cure. If desired, it can Lubricating nipples are replaced, or a suitable threaded plug is screwed in. After the Plastic compound is the tool 22, which is only required for a short time removed, or the vehicle is lowered again if a jack has been used.

In the examples described below, all information is based on weight, unless otherwise stated.

example 1

In seven automobiles, the worn ball joints on the control linkage were repaired using the procedure described above. The control stands were on both sides Equipped with an upper and a lower ball joint, but the stabilizer ball joint seldom wears out the load-bearing joints on each side were repaired in each case. The lower left ball joint was attached to each car repaired using a thermosetting resin while repairing the lower right ball joint using a thermoplastic material. the

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Mixtures used for repair had the following composition}

under the influence of heat epoxy resin (condensation product of hardening bisphenol-A and Bpichlor-

hydrin, epoxy equivalent weight = 175-180) 16 parts

Curing agent (ZZLH 0572 - polyamine, a curing agent that acts quickly at room temperature, Bakelite - Union Carbide)

4 ropes

Graphite 13 "4 parts

thermoplastic Polyamiffliaräs (Ho. 115 Zytel, lylon 6-6

malleable) $ 100

The thermosetting composition could be squeezed out of the grease gun without difficulty if the mixing was done before curing. Before the addition of the graphite, the viscosity at a temperature of 25 ^° C. was approximately 13-17 (according to Stokes), which was somewhat higher after the addition of the graphite. The cone penetration value of the uncured graphite-containing resin was 32.4 "ad after a curing time of 12 minutes reduced calibration of £ indringw <irt to 292 at 47 ⁰ C. the gel time of the mixture took about 15 minutes. The thermoplastic resin was at a temperature of about 310 - liquid 54O ⁰ C and had a relatively low viscosity approximately equal to the bearing grease on.

Both mixtures were relatively easy to inject into the worn joints, which in all cases contained residual grease from previous lubrication. As the repair mix was injected, loose fragments of the worn bearing material and old grease were washed out of the joint, and any remaining material appeared to be firmly embedded in the bearing repair mix. In each case, the vehicle was raised using a jack to relieve the weight of the vehicle on the wheels. In the case of spring-loaded ball joints, the repair mixture was pressed into the joints in order to increase the pressure on the spring.

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After the curing mixes, the motor vehicles were driven under normal traffic conditions for a distance of driven about 32,000 km. Then the repaired joints were examined for their condition. Here are the following get the results listed:

T a b e 1 1 e I

dare Xage des to the right Game in Joint (in mm) Driving distance purposes of investigation No. Joint left before the
repair after
Exam drive in km were spring-loaded and therefore had or 1 Left to the right 1.37 0.74 33,800 1 right ^r} left 1.12 0.61 33 · 800 2 ^{ί) left to the right 1, o2 0.13 32,800 2 ■ "'left 1.12 0.05 32,800 3 to the right 2.21 0.15 32,860 3, Left 0.41 1 32,860 4 ^(4th to the right 0.36 0.05 32,880 4, Left 1.14 1.42 32,880 5 ^(4th right 1.30 1.63 32,000 5 ^A) left 1.17 0.33 32,000 6th to the right
⁴ ^ left 2 2 32,700 6th right 2 2 32,700 7th ' ⁴ ^ left 2 2 32,430 7th to the right 2 2 32,430 ₈ (3, ^r4; Left 0.33 0.36 32,860 8th
g (3. right 1.22
0.41 0.20
0.28 32,860
32,260 9 damage 1.85 1.55 32.260 ι 10 ^ ⁵ These joints 0.81 0.43 48,940 10 1.22 0.59 48,940 11 ^(3rd 2.06 1.52 48,860 11 1.02 1.02 48,860 1) when expanding 2)

no play on after wear and tear. Prior to the repair, the joints were obviously badly worn, as seen from the position of the ball in the pan. After the repair, the pedals of the joint were more stressed, and out of the

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The position of the ball could be seen that the joints were approximately in had been restored to normal

3) Both joints were hardened with heat Resin used.

4) the location of the joint parts was not as accurate as with the Test trolleys 1-3.

In all cases the joints worked properly on all Driving speeds and under all driving conditions on the roads »The driving tests showed that the repaired joints over a distance of at least 32,000 km is satisfactory worked

Example II

Using the method described above, two axle bearings of a roll of a film-drawing calender plant were repaired. You camp were approximately 36 cm in diameter and approximately 36 µm in length. The clearance prior to repair was approximately 1.3 cm. The bearings were made using the heated hardening resin according to example I repatriated? in which the properties of this resin are specified "

At the beginning the inner or rotatable part (the shaft) lubricated »Then the shaft was as far as possible in the middle of the housing or the outer rope of the bearing and on used adjacent to the other roller. Then a steel ring was placed on each end of the bearing housing, which later should hold back the repair resin to be injected. Steel nipples were then welded to one of the steel rings through which the Repair resin in the space between the shaft and the bearing housing could be injected · The repair resin was in the manner described in Example 1 in the above room injected. The resin hardened in one night, after which the warehouse could be put into operation immediately. The camp resin On the other hand, it can also be hardened in a much shorter time by the action of heat. A very important feature of the invention is to be seen in the fact that the bearing does not need to be removed or dismantled for the repair can be carried out, which avoids valuable downtime will.

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After six months of intensive operation, the repaired bearing worked just as well as similar bearings with the conventional bronze bushings.

Example III

Four ball joints on two arms of a road grader were repaired using the thermosetting resin of Example I. These joints are usually provided with inserts to prevent play in the joints. However, when these insoles wear out, so muse the whole ball joint can be repaired.

In the present example, all of the material in the inserts of the ball joints was worn out before the repair time. she Joints were dismantled and new insoles were put in, as is normal practice. After that it became under Heat-curing resin according to Example I in the tree between the inserts and the bearing housing using the injected in the procedure described in Example I. The ball bearing repaired in this way has the merit that no new insoles were required after the old insoles wore out. Instead, the resin mixture serves as a storage area, on which the ball can turn. After extensive use, the ball joints still worked as well as ball joints with deposits.

Example IV

Various repair mixes were prepared using epoxy resins with various curing agents. Some of the blends were tested for their properties before curing to compare them to the bearing lubricating grease, and after curing, the materials were examined to determine their hardness, percentage of compression under load, and percentage of permanent deformation after testing . Using ASTM D 217-65 T, the relative viscosity of the compositions with respect to lubricating greases was determined. In this test, the "Ace ^H (Lithium D) grease" gave values of 266-269 and "Trophy Amber" grease a value of 287.

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The ASTM regulation was used to determine the compression values D 695-63 T (Compressive Properties if Rigid Plastics) complies with the exception that the test sample is made from a flat disk with a bead of about 2.5 ma and a diameter of 15 mm and therefore the shape of the composite The load was 0.5 mm per minute, and the test samples were subjected to a maximum load of 350 kg / cm.

The composition of the repair mixes is given in the table II stated. The compositions exhibiting less deformation after testing are more wear resistant

Table II

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II

mixture Epoxy
share Curing
management
middle
Parts metal
powder
Parts lubricant
Parts compression
in the
test permanent
Deform.
after
test Cone-
penetration
viscosity A. 12 * 8 ^b Cu, 60 MoS ₂ , 20 13.0 0.10 B. 12 * 8 ^b Mon, 50 MoS ₂ , 30 7.8 0.16 269-275 C. 9.4 * 14.2 ^b Al, 53.2 MoS ₂ , 23.2 12.3 0.10 O D. 10.9 * 7.3 ^b Pe, 61.4 MoS ₂ , 20.4 10.8 0.33 cc
cc
CD
CO E.
P. 17.4 *
17.8 ^a 2.6 ^C
2.2 ^d - 9.6
4.8 0.10
0.0 CC G 16.7 * 3.4 ^e __— co
-J H 12.0 * 8.9 ^f —— __— I. 10.9 * 7.3 ^b 8.4 3.6 J 16.0 ^a 4.0 « —_ 8.5 4.11 324-392 K 16.0 ^a 4.0 « Graphite, 13.4 8.6 L. 16.0 * 4.0 « MoS _2, 46.7 5.9 ___ M. 16.0 * 4.0 « _— MoS ₂ , 10 - Graphite, 10 H 16.0 ^a 3.0 ^e | 4th , 0 »- Graphite, 15.3 8.4

O U) U) CD

CD O Co

O 16, O ^a

Q Hylon

Zytel molding resin

£ acetal resin

S Merlon polycarbonate resin

4.0 ⁿ -

MoS ₂ , 53.7

1T3-100

-100

-100

1.0
1.78

3.35

O
O

a) Epoxy resin, condensation product of bisphenol-A and epichlohydrin, epoxy equivalence weighted

175-180 "

b) Yersamid 125, linear polyamide curing agent, derived from the condensation of G » diner fatty acids and polyamines,

c) Epicure 874, aliphatic curing agent, equivalent weight approx. 40 for those that cure quickly Epoxy resins,

d) ZZUl 0054, polyamine curing agent, equivalent weight approx. 25,

e) Epicure 87, highly reactive modified aliphatic amine curing agent,

Equivalence weight approx 38,

f) Epicure 858, polymeric amidoamine curing agent, equivalent to * approx. 116

g) ZZUL 0372, polyamine, fast-acting with tree temperature curing agent Äquivalenzgew.ca _o 45, h) Epicur 861, accelerated polymercaptan curing agent equivalent weight of about 63 ·

CD CO CaJ

Example Y

A motor vehicle with new compression ball joints at the load-bearing point was under normal conditions over a Driven distance of 80,000 km. One ball joint has been properly serviced, i.e. regularly lubricated. The other Joint was initially filled with the storage mixture having the following composition according to the procedure described above

Parts

A «epoxy resin, novolac with more than two Epoxy groups per molecule (Epi-Bex 5109) 16.75 B. a mixture consisting of

90 g of mercapto-terminated butadiene: acrylonitrile polymer

30.0 polysulfide curing agent (Epicure 861 H)

15.0 g graphite (99 * less than 43 microns) 1.87 g MoS ₂

1.87 g polytetrafluoroethylene powder 5 »3

Pas eeparatur mixture pointed out

four hours after injection

a Shore D hardness of 8

92 according to Shore A and seven hours after injection

Shore S hardness 15, twenty-four Hours after the injection

a Shore D hardness of 15. After complete curing, this was

Tensile strength 38.5 kg / cm ² at 100 pound elongation and the modulus of elasticity 38.5 kg / cm ² .

The joint provided with the injection was not lubricated during the test. The experiment showed that «wiping the ball and the pan is no game and therefore no Wear while driving over a distance of 80 * 000 km occurred while the regularly serviced joint was playing

ORIGINAL INSPECTED

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γόη had 0.25 to 0.38 mm, so that a corresponding wear Template.

Example VI

A 1968 Ford car with spring-loaded ball joints was driven under normal conditions over a distance of 80 * 000 km. One joint was initially lubricated and provided with an injection of the bearing repair material having the following composition

Α · Epoxy resin, novolac with more than two

Epoxy groups per molecule (Epi-Rex 5109) 12 g

B. mereapt © closed butadiene

Acrylonitrile polymer 14 g

Polysulfide curing agent

(Epicure 861 M) 7.9 g

Graphite (99 # less than 43 microns) 4.31 g

G. Lithium Grease - 18 g

Before adding part A, ingredients B and C mixed with each other.

The test showed that the ball joint worked perfectly after the test.

Example VII

The method described in Example VI was carried out again, the repair compound having the following composition had

Parts

A. 62.3 parts doluene diisocyanate 31.4 parts polypropylene glycol (mwi about 400,
Hydroxal number approx.265)

6.3 parts of polyoxypropylene, derivative of

Trimethylolpropane (mw: eungefo 410)

Hydroxyl number approx.410) 30

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Β 88.9 parts of polypropylene glycol (mwiungef. 2000

Hydroxyl number approx.561)

0.37 parts lithargepaete 4.7 parts Cab-O.sil

5.4 parts of methylene bis-orthochloroaniline

0.34 part of 2-ethyl-hexoic acid salt of calcium (calcium hexogen)

0.59 parts of phenyl mercuric acetate

0.4 parts of Ionol 100

Ο Graphite (99 # less than 43 microns) 56

Before adding ingredient A, ingredients B and C were mixed together.

The results of the driving test showed that the ball joint was working perfectly.

Claims

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Claims (1)

Claims ■ f · - Polymer-containing bearing repair compound for separating Ball joints and axle bearings with a plastic insert located in a housing, characterized in that the repair compound consists of a curable thermoplastic or thermosetting plastic, which is liquid or through Heating can be liquefied to such an extent that the liquefied plastic can be injected through a grease nipple before it hardens. That the viscosity of the plastic in the liquefied state is 200 to 500 according to ASTM regulations for testing lubricating greases, and that the repair compound can be loaded statically and dynamically with 17f5 to 35 kg / cm after hardening, 2 · bearing repair compound according to claim 1, characterized in that the plastic hardens under the action of heat. 3 · lag repair compound according to claim 1, characterized in that the plastic is thermoplastic. 4. Repaired bearing with the repair compound according to claim 1, characterized in that the repair plastic compound is on the movable part of the bearing and between this * and the worn original stock is located. 5. Bepariertee lager according to claim. 4, characterized in that * 8 the renewed stock material is a lot of a contains solid lubricant β. 109808/1897 6. Separate bearing according to claim 4, characterized in that the plastic material consists of an epoxy resin. 7 · Repaired bearing according to claim 4 »characterized in that the plastic material consists of an epoxy resin and consists of an elastomer. 109808/1897