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TECHNICAL INFORMATION FOR
"LMKAS" COMPENSATING RINGS AND THRUST RINGS FOR BEARINGS (RAM)

In the construction of rotating machinery such as electric motors and other units, there is an ever an increasing need to reduce noise to the absolute minimum, particularly when these machines are used in offices, laboratories, hospitals, cinemas, private homes etc..

The main source of machinery noise is due to ball bearing track slackness, and if this tolerance is taken up by means of the LMKAS rings which exerts a pressure on the outer-ring bearing track against the balls, then it is possible to obtain a quieter running.

The use of the LMKAS rings have a further advantage that it is not necessary to use costly matched paired bearings, neither it is necessary to allow for close longitudinal shaft tolerances thus eliminating the use of fitting shims. With LMKAS rings, the shaft can freely expand due to temperature creep without damaging the bearings or their seats.

Knocking and vibration are very often the reason for bearing failures, LMKAS rings are employed as shock absorbers in a multitude of applications.

LMKAS rings have also been successfully mounted on machine tools such as rectifying heads, woodworking machinery, pumps, gearboxes, pneumatic and hydraulic motors etc.


How to order: R144-LMKAS-size code (example: R144-LMKAS-16a)
LMKAS size code
External f of the bearing
D *
d *
s
h
Nr. of waves
Constant of the ring [kg/mm]
Proof load
[kg]
Identification number of the bearing
10
10
9,8
6,2
0,2
1,2
3
2,44
2,44
623
13
13
12
7,2
0,2
1,4
3
8,4
10,08
624
16
16
15,8
10,5
0,3
1,5
3
16,5
19,8
625  634
16 a
16
15,8
10,5
0,15
1,35
3
8,12
8,12
625  634
18
18
17
12
0,3
1,5
3
 ----
 ----
 ----
19
19
18,8
11,4
0,3
1,6
3
14,8
19,04
635  626  607
19 a
19
18,8
13,2
0,2
1,6
3
3,6
5,04
635  626  607
22
22
21,8
14
0,3
1,6
3
13,4
17,42
608  627
22 a
22
21,8
15,8
0,2
1,6
3
2,86
4
608  627
22 H
22
21,8
15,8
0,25
3
3
 ----
 ----
608  627
24
24
23,8
17,5
0,3
1,7
3
6,98
9,87
609
24 a
24
23,8
17,5
0,2
1,7
3
3,1
4,65
609
26
26
25,8
19,3
0,3
1,7
3
5,8
8,12
629  6000
26 a
26
25,8
19,3
0,5
1,7
3
 ----
 ----
629  6000
28
28
27,8
21
0,3
1,7
3
4,37
6,12
6001
28 a
28
27,8
21
0,5
1,7
3
 ----
 ----
6001
28 FG2
28
27,8
20
0,25
3
3
 ----
 ----
 ----
28 FG
28
27,8
20
0,3
3
3
 ----
 ----
 ----
30
30
29,7
22,5
0,3
1,8
3
4
6
6200
30 a
30
29,7
22,5
0,2
1,7
3
 ----
 ----
6200
30 b
30
29,7
22,5
0,5
2
3
 ----
 ----
6200
30 c
30
29,7
22,5
0,4
1,6
3
8
9,6
6200
32
32
31
26,5
0,4
2
3
3,5
5,6
6002
32 a
32
31,7
26,5
0,4
2
3
5,1
8,16
6002
32 b
32
31,7
24,5
0,35
2,2
3
4,32
7,9
6002
32 e
32
31,7
26,5
0,5
2,4
3
7,56
14,36
6201
32 FG
32
31,8
23
0,3
3,5
3
 ----
 ----
 ----
32 FG2
32
31,8
23
0,35
3,5
3
 ----
 ----
 ----
35 a
35
34,5
24,5
0,5
2,5
4
34,5
69
630
35 b
35
34,5
28
0,5
3
3
8,2
20,5
6202
35 c
35
34,9
25
0,3
2
4
11,4
19,38
6202
35 e
35
34,5
28
0,4
3
3
3,85
10
6003  6202
35 FG
35
34,5
28,3
0,4
4
3
 ----
6,5
 ----
37
37
36,6
30,8
0,5
2,5
4
18
36
6301
37 a
37
36,6
30,8
0,3
2,5
4
 ----
 ----
 ----
40
40
39,1
33
0,5
3
4
14,6
36,5
6203
40 a
40
39,1
33
0,5
4
4
 ----
 ----
 ----
40 b
40
39,8
33,3
0,3
3
4
4,45
12,01
6203
40 d
40
39,1
33
0,4
2,7
4
7
16,24
6203
40 FG
40
39,8
30
0,4
5
3
 ----
 ----
 ----
42
42
40
30
0,5
3
4
7,5
18,75
6203
42 a
42
40
33,1
0,5
3
4
 ----
 ----
6203
42 d
42
41
34,5
0,35
3
4
4,9
13
6004  6302
47 a
47
45
37
0,5
3
4
13,6
34
6303
47 b
47
46,5
40
0,5
3
4
9,5
23,75
6005  6204
47 c
47
46,9
37
0,5
2
4
18,8
28,2
6005  6204  6303
47 e
47
46,5
40
0,4
3
4
5,4
14
6005
47 f
47
45
37
0,5
3
5
29
72
6303
52 a
52
51
42
0,5
3,5
5
21,4
64,2
6205  6304
52 b
52
51,8
41
0,5
2
4
13,6
20,4
6205
52 c
52
51,8
41
0,3
1,9
4
3,02
4,53
 
52 d
52
51
42
0,4
3,5
4
5,16
16
6205
52 f
52
51,8
41
0,4
2
4
7,05
11,35
6205
52 g
52
51,8
41
0,4
4
4
7,05
25,4
6205
52 h
52
51
44
0,4
3,5
4
 ----
 ----
6205
55
55
54,8
46,9
0,5
2
4
6,65
9,98
6006
55 a
55
54,8
46,9
0,5
3,5
4
5,8
17,4
6006
62
62
61
51
0,5
3,5
5
12,6
37,8
6206  6305
62 a
62
61
51
0,5
4
4
6,33
22,16
6007  6206
62 b
62
61,9
50
0,5
4
4
8,25
28,88
6206
62 c
62
61,9
50
1
3,5
4
 ----
 ----
6206
62 d
62
61
51
0,4
3,5
4
5,8
18
6007
62 g
62
61
51
0,6
3,5
5
28
81,2
6305  6403
68
68
67,5
55
0,6
4
4
11,2
38
6008
72
72
71
61
0,5
3,5
5
15,2
45,6
6207  6306
72 a
72
71
61
0,5
4
4
3,83
13,4
6207
72 b
72
71,8
58
0,6
4
4
10,6
36,04
2000  2200
72 d
72
71
61
0,4
3,5
5
6,46
20
2000
72 g
72
71
61
0,8
4
5
38
121,6
2400
75
75
74,8
66
0,6
4
4
4,6
15,6
1660
80
80
79
71
0,6
3,5
6
21,5
62,35
2400  2600
80 a
80
79
71
1
4
6
39,2
141,12
2600  2800
80 b
80
79,8
64
0,7
4
4
14,3
47,2
2400  2600
80 c
80
79
71
0,5
3,5
5
7,35
22
2400  1700
80 f
80
79
71
0,8
4
6
40
128
2600  2800
85
85
84
74
1
4
6
80,5
239
2600
85 a
85
84
74
0,6
3,5
6
18,6
53,9
2600
85 b
85
84,8
70
0,8
4
6
 ----
 ----
2600
85 c
85
84
74
0,5
3,6
5
8,7
27
2600
90 a
90
89
79
0,6
3,5
6
15
43,5
2750  3200
90 b
90
89,8
72
0,8
4
4
19,05
60,96
3200
90 c
90
89
79
0,5
3,5
6
10
30
2200  2750
100
100
99,8
82
1
4
6
 
 
4150  4300
100 a
100
99
89
0,6
3,5
6
16,5
47,9
2400  3400  4150
100 b
100
99,8
82
0,9
4
4
 
 
4150  4300
100 c
100
99
89
0,5
4
6
10
35
2400  3400
110
110
109
90
1
4
4
17,9
53,7
3000  3750  4800
110 a
110
109
90
1,5
5
6
 
 
5000
110 b
110
109
99
0,6
4,5
7
15,5
60
3750  4800
110 c
110
109
99
0,7
4,5
7
22,5
85,5
3750  4800
110 e
110
109
99
1
5
7
 
 
4800  5000
120
120
119
104
0,8
4
6
23,7
75,84
4400  5600
130
130
129
110
0,8
4
6
29,3
90,58
3900  5200  6400  6800
140
140
139
121
0,9
4
6
26,4
81,84
4550  5700  7200  7800
150
150
149
126
0,9
4
6
29,45
91,3
4750  6550  8150  8500
160
160
159
137
1
4
6
30,7
92,1
5700  7500  8800  9300
170
170
169
147
1
4
6
 
 
6400  8500  9650

How to order: R144-LMKAS-size code (example: R144-LMKAS-16a)
Please note that these products are not stocked in the USA, so allow sufficient lead times for delivery.
These products may also be subject to minimum quantities.

ELECTRIC MOTORS COMPONENTS: COMPENSATION RINGS (LMKAS) AND ADJUSTMENT PLAIN RINGS (RAM)

In the construction of rotating machinery such as electric motors and other units, there is an ever an increasing need to reduce noise to the absolute minimum, particularly when these machines are used in offices, laboratories, hospitals, cinemas, private homes etc.. The main source of machinery noise is due to ball bearing track slackness, and if this tolerance is taken up by means of the LMKAS rings which exerts a pressure on the outer-ring bearing track against the balls, then it is possible to obtain a quieter running. The use of the LMKAS rings have a further advantage that it is not necessary to use costly matched paired bearings, neither it is necessary to allow for close longitudinal shaft tolerances thus eliminating the use of fitting shims. With LMKAS rings, the shaft can freely expand due to temperature creep without damaging the bearings or their seats. Knocking and vibration are very often the reason for bearing failures, LMKAS rings are employed as shock absorbers in a multitude of applications. LMKAS rings have also been successfully mounted on machine tools such as rectifying heads, woodworking machinery, pumps, gearboxes, pneumatic and hydraulic motors etc.

In the last years the ball bearing has been object of many prescriptions about dimensional precision and reliability, as well as the compensation ring had to improve its quality and update its main features and performances. Thanks to the compensation rings, the ball bearings achieved indeed: - higher speed; - low vibrations and noise levels, - toughness increase and consequent longer duration of their effectiveness, even in case of critical conditions. The performance improvements of the ball bearing, as well as of the compensation ring, led also to an improvement of the electric motors general performances, where these parts are generally assembled. In particular the compensation rings (called LMKAS) - are used for the construction of rotary machines (for ex. electric motors) with the specific purpose of obtaining a reduction of the rolling friction elements noise.

The main noise source in the machines is the slackening of the balls in their races inside the bearings; this tolerance may be recovered by the compensation rings LMKAS. The main task of the compensation rings is indeed to perform a pressure on the external ring of the bearing, in order to allow a more silent rolling. The expansion of the motor-shafts submits the ball bearings to heavy axial loads and moreover damages the bearings, increasing the electric motors noise. By assembling the compensation rings LMKAS, the motor-shafts may expand themselves without damaging the rolling friction components and their boxes. The rings LMKAS allow to correct the eventual wheelbase defects that may occur in the production of the electric motor. Hammerings and vibrations are often the causes of the ball bearings abrading: using the rings LMKAS as shock absorbers, this disadvantage is limited. The compensation rings are successfully used also on tool machines like grinding machines, wood machines, pumps, speed reductors, pneumatic and oleodinamic motors. Besides, in case of machining mistakes which cause a too big box, the manufacturer can produce and supply, adjoining the ball bearing, plain rings of different thickness, and of the same diameter of the LMKAS (Adjustment plain rings RAM).

These compensation rings LMKAS are made by laminated spring steel C67 according to the UNI 10132-4 norm (Cold laminated - by heat treatment - steel bands). For the stocking of the raw material necessary for the production of the compensation rings, the manufacturer deals only with suppliers which have a certificated quality system, according to the international guidelines which grant, as the manufacturer does (certificated since the 1999 according to the UNI EN ISO 9002 norms and then to the UNI EN ISO 9001:2000 norm), an high level of quality standard. The compression load, that the ball bearing may suffer, called: - load constant; - maximum load (which represents the upper limit to the load that can be applied); and declared by the manufacturer, are obtained by making hundreds of tests on different production batches after the stressing of the rings to the yield point, obtained by compressing them 3 times, to an high of + 0,1mm of its thickness (in fact, after countless tests, we could define that the high and the consequent load are stabilized after pressing them 3 times, because they don't reveal meaningful oscillations by performing further compressions). The manufacturer may grant a devition in the indication of the load of their rings which doesn't exceed the 20% tolerance.

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