DE3047039A1 - TWO STAGE VIBRATION DAMPER - Google Patents

Description

Two-stage torsional vibration vaccine

Wire vibration dampers are usually used in clutch units for manually shiftable transmissions in automobiles used to neutralize torsional vibrations caused by Uotor go out and have undesirable effects, such as shock loads, vibrations, noises, etc. in the transmission and in the drive while the vehicle is moving is in operation. Furthermore, a hydraulic torque converter or a fluid coupling is also required for an automatic transmission, which is used to reduce fuel consumption via a direct drive between the medium clutch input and the clutch output has a locking clutch, a vibration damper. The vibration dampers developed so far were, however, due to the relative short arc length of the relative movement between the driving and driven elements of the damper in the clutch Can only be used to a limited extent.

In order to overcome these disadvantages, the conventional short trajectory dampers have been replaced by vibration dampers replaced with a longer trajectory. Such vibration dampers, for example in the American Patent applications 801 989, 860 448 and 45 711 as well as the US Pat. No. 4,139,995 to which it relates and see an extended one Movement path before, especially with locking clutches for

130036/0720

3047Cr? 9-

a torque converter. However, problems arose in those cases where an even longer period of exercise was required. The present invention enables this even longer trajectory.

The invention relates to a two-stage torsional vibration damper unit which can be used in a locking clutch for a torque converter and in which a larger one Relative movement between the driving and driven elements of the damper can take place than before was possible * The greater the arc of the relative movement between the driving and driven elements, the less is the damping rate. Under certain engine and transmission operating conditions, a damping rate that is less than that with those noted above is desirable Lowest rate available to dampers. This lower damping rate can be achieved with the one designed according to the invention achieve two-stage damper *

The present invention also relates to a torsional vibration damper unit which, due to its rather low damping rate, has a hydraulic torque converter for the Hydraulic damping inherent in the vehicle increases. Without a lock-up clutch, the torque converter hydraulically dampens unwanted vibrations, resonances, etc. Will However, if a lock-up clutch is provided, a separate damper is required. The damper designed according to the invention

130036/0720

ORIGINAL INSPECTED

with increased mobility, one sees sufficient low damping rate, so that the hydraulic damping effect of the torque converter can be effective and improve the efficiency of the vibration damper «

The present invention further relates to a novel two-stage torsional vibration damper unit, which has two concentric circles of damping springs, which are in one Housing are arranged and are driven by drive tongues which are mounted on a drive element, for example a calving plate for the locking clutch. Floating Elements separate the springs in the inner and outer Feather circles, and two or more groups of feathers in each circle work parallel to each other «while the feathers in each one Act in a group.

The present invention further includes the arrangement of a novel two-stage torsional vibration damper unit with concentric circles of springs, in which the springs are driven by drive tongues in the outer circle and inside of the spring groups are separated by floating separation rings that have separation arms between adjacent springs. In the inner spring circle, which is secured by bracket elements on the Receiving housing is driven, floating wedges or shoes, which are movable in the receiving housing, separate adjacent springs from each other. The inner groups of springs drift finally, the arms of a hub element a connected to the input shaft of the vehicle transmission.

130036/0720

ORIGINAL INSPECTED

The present invention further includes the arrangement a two-stage torsional vibration damper unit with concentric circles of feathers arranged in two or more groups with the feathers inside each Group are separated from each other by floating wedges or shoes »

Another feature of the invention is its creation a two-stage torsional vibration damping unit, which has a low attenuation rate with a maximum arc related provides for the relative movement between the driving and driven elements of 90 °. The arrangement possesses a sweeter circle of feathers arranged in three groups which work in parallel with three sets of springs in each group, and an inner circle of springs that divides into two parallel groups riding three springs arranged in each group

Further objects of the invention are to provide a construction of the greatest simplicity, effectiveness, economy and Provide ease of assembly and operation · These goals and advantages are detailed below Description of a preferred embodiment of the invention in conjunction with the drawing. Show it:

130036/0720

FIG. 1 is a rear view with partially broken away parts of a two-stage rotary oscillation damper unit;

FIG. 2 shows an enlarged section through the damper unit along line 2-2 in FIG. 1 in one Torque converter;

FIG. 3 shows an enlarged partial section along line 3-3 in FIG. 1;

FIG. 4 is an enlarged partial section along line 4-4 in FIG. 1;

Figure 5 is a rear view of the front retaining plate for the unit;

FIG. 6 shows a section through the front retaining plate along line 6-6 in FIG. 5;

FIG. 7 shows a partial section along line 7-7 in FIG. 5; Fig-jr θ is a rear view of the rear support plate;

FIG. 9 along a section through the rear retaining plate Line 9-9 in Figure 8;

Figure 10 is a tail section along line 10-10 in Figure 8;

130036/0720

Figure 11 is a side view, partially in section, of the

inner sliding separation element in operating position;

Figure 12 is an enlarged exploded perspective View of an inner sliding separator element;

FIG. 13 shows a rear view with parts broken away of a second embodiment of a two-stage torsional vibration damper unit;

FIG. 14 shows a partial section through the unit along a line 14-14 in Figure 13j

FIG. 15 is a side view, partially in section, of a sweeter sliding separator element in FIG Operating position;

Figure 16 is a side view of the outer sliding partition member;

Figure 17 is an end view of the outer sliding partition member;

Figure 18 is a horizontal section through the separating element along line 1B-18 in Figure 16;

130036/0720

ORIGINAL INSPECTED

Figure 19 is a partial section along line 19-19 in Figure 16;

FIG. 20 is a perspective view of a wear plate for the separating element;

FIG. 21 is a rear view with parts broken away of a third embodiment of a two-stage rotary- vibration damper unit;

FIG. 22 shows a section through the Därapfeinheit Line 22-22 in Figure 21;

FIG. 23 is a partial section along line 23-23 in FIG. 21; and

FIG. 24 shows a partial section along line 24-24 in FIG

A two-stage torsional vibration damping unit 10 is shown in FIGS. 1 and 2, which is mounted in a locking clutch 11 for a torque converter 12 is used. The torque converter includes a housing 13 that extends from the output shaft of a motor (not shown) is driven and a front cover 14 with an annular coupling surface formed on the inner surface thereof, and a rear cover 16 connected to an impeller (not shown) is in connection. A turbine 17 is in the front

130036/0720

Arranged portion of the housing and attached at its inner periphery 18 to a turbine hub 19, the wit inner splines 21 for receiving the splined end of a Transmission input shaft 22 is equipped · A stator (not shown) is also suitably arranged in the housing.

An axially movable piston plate 23 has an annular friction surface 24 in the vicinity of its Außenurafanges, which with the Surface 15 cooperates to form the lock-up clutch 11, and an inner annular flange 25 which is slidable is mounted on a bearing 26 and sealed by an annular seal 27 which is arranged in a groove in the bearing Both the piston plate 23 and the damper unit 10 are arranged in the space between the front cover 14 and the casing of the turbine 17.

The vibration damper unit 10 comprises three drive tongues 28 which are spaced apart in the circumferential direction and which, on their base surfaces 29, have two or more rivets 31 on the piston plate 23 · The drive tongues extend radially inward into a housing supported by a front retaining plate 32 and a rear support plate 33 is formed. So that the tongues can move relative to the housing, the in substantially parallel peripheral flanges 37, 52 of the plates 32, 33 attached to each other at a plurality of points around the circumference by stop pins 34. Any pen has a central enlarged portion 35 which acts as a spacer between the flanges, the

1 30 0 36 / 05.720

Ends 36 of the pins clurcff you openings 38, 43 in the flange

ORIGINAL !! MSPECTED

see protruding and compressed. In this way the Flanges held at a distance by the sections 35, so that the tongues extend into the housing and can move relative to this.

The front holding plate 32 is circular and has an irregular cross-sectional shape, as can be seen from FIGS. It is provided with an annular peripheral flange 37, the openings 38 for the rivets or stop pins 34 has, with an intermediate body portion 39, which with the peripheral flange over three external drive elements 41 is connected, and with a inner Urafangabschnitt 42, which is generally conical and connected to the intermediate section 39 via two oppositely arranged connecting arms 43, 43. Each link arm has an internally offset central one inner drive bracket 44 on.

The outer drive elements 41, in conjunction with the Uraf-ang8f ?ansch 37 and the intermediate section 39, form three elongated ones arcuate slots or openings 45 for the groups of outer damping springs 73, 74 and 75. Each opening is further defined by an outer arcuate lip 46 on the flange 37 and an inner arcuate lip 47 on the intermediate section 39 limited. Similarly, the connecting arms> j 43 form η connection with the intermediate section 39 and the innoren section 42 has two elongated arcuate slots ode "openings 4Θ for the groups of inner damping springs 7 (3, 77 and 78. The intermediate section 39 has a

130036/0720

BATH ORIGINAL

Spring retaining lip 49 that calibrate in the opposite direction as the lip 47 extends. The inner perimeter 42 converges inwardly to a central opening 51.

The rear retaining plate 33 comprises its peripheral flange 52, the circumferentially spaced openings 53 for receiving the stop pins 34 and a central body portion 54 which is flanged to the Urafang via three drive elements 55 which are equally spaced in the circumferential direction are connected. The drive elements form three arcuate slots or openings 56 generally shown in Axially aligned with slots 45 and outer lips 57 on flange 52 and inner lips 58 on body portion 54 have. The central body portion 54 bulges rearwardly and forms enclosed pockets for the damping springs 76, 77 and 78. He also has two inwardly offset, oppositely arranged inner drive yokes 61. The body section ends in one inwardly extending radial flange 62, the one forms central opening 63 which is axially aligned generally with opening 51 in front panel 32 is.

On a rearwardly extending annular flange 64 of the front support plate 32 are two separation rings and 68 stored. The ring 65 has three equally spaced in the circumferential direction and slightly to the rear

130036/0720

offset Trennungsarrae 66, which extend radially outward and in the circumferential direction Fingers 67 end. Similarly, the ring 68 has three circumferentially equidistant, slightly forwardly offset separation arrays 69 which extend radially outward and extend in the circumferential direction Fingers 71 end. The arms 66 and 69 are offset in opposite directions so that they and their respective fingers 67 and 71 extend into a guide channel 72 between the circumferential flanges 37 and 52 and the outer Lips 46 and 57 formed on the front and rear panels is.

Between the outer drive members 41 and 55 on the plates 32 and 33 and the arms 66 and 69 of the rings 65 and 69 are three groups of damping springs 73, 74 and 75 arranged, which work parallel to each other, while the springs in each group act in series. Similarly, two sets of dampening wheels 76, 77, and 78 operate in parallel with each other and are in the inner spring pockets 59 between the drive brackets 44 and 61 and pairs of sliding partition members 79 and 81 are arranged. Each separator includes a beveled one Body portion 82 which ends with its broad end in an arcuate sliding portion 83 which extends in the circumferential direction from both diverging edges 84, 84 of the body segment cis extends. An isolating terminal 85 has two outwardly diverging sides 86, 86, which have a rounded

130036/0720

the connecting section 87 are connected to one another, that of the beveled body portion 82 of each separation element is fit. The arms terminate in outwardly extending flanges 88 that mate with the inner surfaces of the arcuate slide portion 83 are engaged. The sides Θ6, 86 extend outward at 89 over the Width of the beveled body portion addition, so that they are in engagement with the damping springs 76, 77, 78 " The sliding portions 83 of the separation elements are engaged with a guide surface 91, which is on the middle Body portion 54 of plate 33 is formed, and the extended sides 89 are in the spring pockets 59 between fitted in conformance with the plates.

A hub assembly 92 includes a hub shell 93 having inner splines 94 that mate with outer splines 95 on the turbine hub 19 are in connection, as well as a hub plate or a flange 96 which is plugged onto the hub shell and extends between the plates 32 and 33 on the inner periphery thereof. The flange 96 includes two diametrically opposed arranged hub arms 97, 97 between the pairs of Drive yokes 44 and 61 extend and are generally axially aligned therewith. The arms have outwardly diverging ones Edges 98 and terminate in fingers 99 extending in opposite directions in the circumferential direction Hub arms 97 in the path of movement of the inner compression springs 76, 77 and 78. The radial flange 62 of the rear plate is also mounted on the hub shell 93.

130036/0720

The outer arcuate lips 76 and 57 on the plates and 33 have re-entry scarapes 101 and 102, the are formed adjacent to the drive elements 41 and 55 and both as holders for the springs 73 and 75 and as inclined Planes act to prevent outward movement of the springs when the drive tongues 28 are engaged during cushioning be moved away from elements 41, 55 *

In operation of the torque converter 12, the fills in Vane of the impeller, oil flowing into the turbine and the stator, also the torque converter housing 13, and the oil pressure, which increases as the speed of the turbine 17 increases, gradually pushes the piston plate 23 and the one connected to it Damper unit 10 in Figure 2 to the left, so that the friction surface dnr piston plate with the surface 15 of the front Cover 14 can engage the impeller and turbine of the torque converter for direct drive to interlock. Assuming that the piston plate rotated counterclockwise according to Figure 1 is, the calving plate 23 and the drive tongues 28 begin to rotate when the coupling surfaces relative to the stationary damper housing engage with each other.

When the drive tongues move between the flanges 37, 52 of the retaining plates 32, 33, they step with the damping springs 73 in engagement to compress them. The springs 73 act on the rear separation ring 68 arms 69 so that springs 74 are compressed.

130036/0720

These springs in turn act on the arms 66 of the front Separation ring 65 for compressing the springs 75. The latter springs act on the outer drive elements 41, 55 of the plates 32, 33 and set them to rotate relative to the hub unit 92 * By the rotation of the Plates 32 and 33 press the inner drive pin 44, the pair of springs 76 together, and these springs engage and move the sliding separating elements 79, to compress the springs 77 · The springs 77 in turn move the sliding separators 81 to compress the springs the arms 97 of the hub unit 92 are urged in such a way that the hub housing 93 and the turbine hub 19 are set in rotation resulting in a rotation of the transmission input shaft 22 · As a result, the above-described damps Unit vibrations, noises etc. in the drive with an arrangement of three groups of external springs 73, 74, 75, working in parallel with each other and two sets of inner springs 76, 77, 78 working in parallel with each other. The feathers in each group act in series.

A second embodiment is shown in FIGS a two-stage torsional vibration damper unit is shown, which is similar to that shown in Figures 1-12, corresponding parts having been given the same reference numerals having an index a · In this embodiment there is a second series of sliding Separation elements 103 and 104 instead of the front and

130036/0720

ORIGINAL INSPECTED

rear separation rings 65 and 68 shown in Figures 1-12 are shown use. These separators slide on the outer lips 46a and 57a of the front retainer plate 32a and the rear holding plate 33a. The separation elements

103 and 104 are of identical design and made from stamped sheet metal. They point outwardly diverging Sides 105, which are provided with inwardly curled edges 106 and connected to one another via a rounded inner end 107. The sides end at their outer ends in circumferentially extending flanges 108 which have upwardly punched fixing tabs 109 which are inserted into openings 111 of a generally rectangular wear plate 110 are added, which rests on the flanges 108. The wear plate 110 is located with the outwardly extending Lips 46a and 57a on the retaining plates engaged, wherein the tabs 109 in the guide channel 72a between the Flanges 37a and 52a are added to allow movement to direct the separation elements.

In operation, when the piston plate 23a rotates, the drive tongues 28a move relative to the holding plates 32a and 33a and engage with springs 73a. As a result of their compression, the springs slide against the ones Separation elements 103 are printed and press the springs 74a together, which in turn are the sliding separation elements

104 press against the springs 75a. The drive elements 41a, 55a effect the compression of the springs 75a a rotation of the holding plates 32a, 33a, from which a

130036/0720

Rotation of the drive yokes 44a, 61a against the inner springs 76a results. The compression of the springs 76a can Separation elements 79a compress the springs 77a, the again the separation elements 61a for pressing together act on the springs 78a. The latter springs engage hub arms 97a to rotate hub assembly 92a, causing the gears to rotate. input shaft results.

A third embodiment is shown in FIGS a two-stage vibration damper unit 112, which corresponds to that of Figures 1-12, with identical parts are provided with the same reference numerals having an index b. The piston plate 23b corresponds to im essentially of the piston plate shown in Figure 2, with the exception of an inclined portion 113 on which two oppositely arranged drive tongues 114 are fastened via screws or similar fastening means. Every Drive tongue has a beveled body portion with outwardly diverging spring engagement surfaces 116, which end in an arcuate base section 117. Furthermore, each drive tongue has an inclined surface 11Θ which abuts the piston plate, an opposing substantially vertical surface 119 and an upwardly extending guide flange 120. Furthermore, a slot extending in the circumferential direction extends 121 through the tapered body portion into the base portion.

130036/0720 _{BAD DWQINAU}

^: v-

A separation ring 122 (Figures 22, 23 and 24) is mounted on the drive tabs on one inclined surface 123 has, which atößt against the piston plate 23, a flat bottom 124 with an annular groove 125 which the guide flanges 120 receives, and a depending Inner flange 126 which is parallel to the generally vertical surface 117 of the tabs. At opposite positions, the ring faces a pair of inward extending thicker sections 127, each terminating in a beveled partition member 126, the inward converging spring engagement surfaces 129 has. Two sliding partitions 130 (Figures 21 and 24) are mounted so that they slide in the channel formed by ring 122. Each partition member includes a tapered body portion 131 with outwardly converging Spring engagement surfaces 132 and an arcuate base portion 133 having an inclined surface 134 which engages the inclined portion 113 of the piston plate, an arcuate surface 135 shown in FIG the bottom 124 of the ring 122 is journalled, and a flat surface 136 which is slidably engaged with the inner surface of the depending flange 126.

An intermediate element 137 comprises an outer ring 138 which has two oppositely arranged Arne 139 (FIG. 22) outwardly diverging spring engagement edges, which in Circumferentially extending fingers 141 end, has,

130036/0720

and an inner ring 142 that connects with the sweeter ring two oppositely arranged drive yokes 143 is connected, the outwardly diverging spring engagement edges 144 have. The drive bracket 143 are with the inner Ring connected by offset sections 145.

An inner drive ring or hub 146 (Figure 22) includes a ring with a pair of oppositely arranged, inwardly extending drive tabs 147 with inwardly converging spring engagement surfaces and one rearwardly disposed inwardly extending annular hub flange 148 suitably attached to the turbine hub 19b of the torque converter is attached, for example by bolts 149. The ring 146 and the tabs 147 point elongated slots 151 running in the Urafang direction, which receive the drive yokes 143 for performing a relative rotation between the intermediate element 137 and the drive ring 146. Slidably mounted on the ring 1 £ 6 are two Pairs of separation elements 152, 153, which with inward converging spring engagement surfaces for separating the inner damper springs 76b, 77b and 78b. The separation elements 12Θ of the ring 122 and the sliding separation elements 130 separate the outer damping springs 73b, 74b and 75b from each other.

As can be seen from FIG. 16, two groups of damping springs 73b, 74b, 75b are provided, which are parallel to one another work, and two sets of internal damping springs 76b,

130036/0720

BATH ORIGINAL

77b, 78b, which work in parallel with each other. Operational In this embodiment, the rotation of the piston plate 73b causes the drive tongues 114 to move leads to a compression of the springs 73b, which act on the separating elements 128 of the ring 122 to the Springs 74ο compress, which in turn on the sliding Separation elements 130 act to compress springs 75b. The springs 75b urge the arms 139, so that this rotation of the intermediate element 137 relative cause the drive ring or the hub 146. Through the Movement of the arms causes the drive yokes 143 to rotate, thereby compressing the springs 76b. From this results in a sliding movement of the separation elements 152 for compressing the springs 77b, resulting in a movement of the Separation elements 153 for compressing the springs 78b leads. Ultimately, this results in a rotation of the lobes of the inner drive ring or hub 146 and thus a rotation Rotation of the turbine hub 19b caused. This steamer version Forren thus ensure a damping effect up to a max: mum of 90 °.

1 30036/0720

Claims (1)

Claims (1 / two-stage torsional vibration damper unit for transmission of torque between driving and driven elements with a piston plate which is assigned to a torque input device, at least two drive tongues which are attached to the Piston plate are attached, and a hub which is connected to an output shaft, characterized by at least two external floating bodies (65, 6Θ or 103, 104), which turns around in an arc-shaped path the hub 92 can move around, at least two inner floating devices (79, 81) located in a second be able to move arcuate path around the hub (92) which is concentric with the first arcuate path, a variety of external compression springs (73, 74, 75), movable in the first arcuate path, a plurality of internal damping springs (76, 77, 78) shown in the second arcuate path are movable, the drive tongues (28) having projections which follow 130036/0720 130036/0720 ORIGINAL INSPECTED extend inside the first arcuate path, and a rotatable intermediate element (32, 33] which has at least two drive elements (41, 55} which are calibrated in the first extending arcuate path, and at least two drive brackets (41, 55) extending into the second arcuate path extend, the hub having at least two arms (97, 97) extending into the second arcuate path with the outer damping springs between the outer floating devices and the drive elements are arranged and wherein the inner damping springs are arranged between the drive yokes and the second floating devices. 2. Torsional vibration damper unit according to claim 1, characterized in that the drive tongues (28) in the axial direction to the Drive elements (41, 55) are aligned and that the secondary arms (97, 97) in the axial direction to the drive birds (44, 61) are aligned when no torque is applied by the input device. 3. Torsional vibration damper unit according to claim 2, characterized in that the outer floating devices comprise at least two separation rings (65, 68), which on Intermediate elements (32, 33) mounted adjacent to one another with each separation ring having at least two outwardly extending arms (66 or 69) which are the outer Separate the damping springs from one another, and the separation ring arms (66, 67) partially in the direction of the neighboring 1 30036/0720 ORIGINAL INSPECTED 30-7-39 Ring are offset inwardly so that they are located in a common plane, and wherein the inner floating means comprise two pairs of sliding separation elements (79, 81) separating the inner damping springs from each other and on the intermediate element (32, 33 ) slide. 4. torsional vibration damper unit according to claim 2, characterized characterized in that the intermediate element has two irregularly shaped retaining plates (32, 33) which are so interconnected are connected that they have a distance from one another, that the drive elements (41, 55) and the drive bracket (44, 61) are formed in one piece with the plates and that the retaining plates (32, 33) have radial circumferential flanges (37, 52) which are spaced from one another to receive the drive tongues (28) therebetween which are in the outer protrude arcuate path of the outer damping springs, wherein at least one retaining plate is mounted on the hub. 5. torsional vibration damper unit according to claim 4, characterized characterized in that the retaining plates have outer arcuate slots (45, 56) which pass through the drive elements (41, 55) are separated from each other to accommodate the outer damping springs and inner arcuate spring pockets (59), which accommodate the inner damping springs, that the drive bracket (44, 61) displaced inwards in the pockets are arranged and extend into the path of the inner damping springs and that the hub arms (97, 97) radially 130036/0720 outward from one hub shell [93} into the second arcuate one Track and between the inwardly offset drive yokes (44, 61) run. 6 * Orehschwingungsdampfeinheit according to claim 2, characterized characterized in that the outer floating means have at least two pairs of sliding partitions (103, 104), which on the intermediate element (32, 33) slide and the outer damping springs (73, 74, 75) separate from each other that the inner floating devices are two pairs of sliding separating elements (79, 81) comprise separating the inner damping springs from one another, and that the intermediate element is a pair of irregularly shaped Retaining plates (32, 33) comprising radial circumferential flanges (37, 52) which are spaced from one another are connected, the drive elements (41, 55) and the drive bracket (44, 61) formed integrally therewith are and νobei at least one retaining plate (33) on the hub is stored. 7. Torsional vibration damper unit according to claim 2, characterized in that it has a pair of oppositely arranged drive tongues (114) in which circumferential slots I 121) are arranged, that the hub (146) has an annular flange (148) which is attached to the output device { 19b) and ends at its outer circumference in a Hing (146) that a pair of oppositely arranged secondary arms (147) radially inward from 130036/0720 BATH ORIGINAL runs the ring and that the intermediate element (137) a middle ring (138), which is arranged concentrically to the hub ring, and an inner ring (142), which is connected to the middle ring (143) via the drive bracket, the drive elements (139) from the central rign extend outwardly into the slots (121) in the drive tongues (114). B. torsional vibration damper unit according to claim 7, characterized in that that the hub ring (146) and the arms (147) are arranged opposite elongated slots (151) which receive the drive brackets (143), and that the drive tongues (114) formed thereon outer Urafangeguiding flanges (120) have. 9. torsional vibration damper unit according to claim 8, characterized featured the sweeter floating bodies a separation ring (i22) having a depending flange (126) and an annular guide slot (125) which defines the guide flanges (120) and a pair of oppositely disposed, inwardly extending spring isolators (128), formed integrally therewith and protruding into the outer arcuate path, a pair of opposed arranged sliding separating elements (130) which are movable on a guide surface (124) of the ring, and two pairs of sliding separators (152, 153) movable on the inner surface of the hub ring. 130036/0720 ORIGINAL INSPECTED