ball screw support - ntn snr · ball screw support bearing unit distributed by: bstu designation...
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With You
BALL SCREW SUPPORT BEARING UNIT
BSTU
DO
C.I_
BS
TU_A
RG
1.G
Ba
- S
AP
: 35
5862
C
once
ptio
n et
réa
lisat
ion
: Ser
vice
pub
licité
NTN
-SN
R /
Com
&C
ie ©
201
5 /
09 -
Pho
tos:
© P
edro
Stu
dio
Pho
tos
- S
hutt
erst
ock
NTN-SNR ROULEMENTS - 1 rue des usines - 74000 Annecy RCS ANNECY B 325 821 072 - Code APE 2815Z - Code NACE 28.15 www.ntn-snr.com
TesT specificaTions
The newly developed LX seal reduces the generation of heat.
Test conditions:Bearing designation: BsTU3080LLX/Gnp4U/L588
Rotational speed: up to 5,000 min-1
Lubricant: special grease L588
1. TempeRaTURe/RoTaTionaL speed cURve
The LX seal has only a minimal influence on the breakout torque
of the bearing.
Test conditions:Bearing designation: BsTU3080LLX/Gnp4U/L588
Lubricant: special grease L588
2. ToRqUe
BsTU bearings offer a very high rigidity, thanks to the use of a
maximum number of large-diameter balls.
Test conditions:Bearing designation: BsTU3080LLX/Gnp4U/L588
axial thrust load: up to 20 kn
3. BeaRinG RiGidiTy
a spindle ball bearing is constantly subjected to cooling liquids
and metal shavings. after the test, no contamination was detected
on the inside of the BsTU bearing.
Test conditions:Bearing designation: BsTU3080LLX/Gnp4U/L588
Rotational speed: up to 2,200 min-1
Lubricant: special grease L588
dirt particles: diameter: 5 to 75 µm
components: sio2, fe
2o
3, al
2o
3 and others
color of dirt particles: Brown
Test duration: 1 hour
5. seaL
The BsTU bearings are filled with special long-life polyurea-
based grease (L588).
This grease is very effective in reducing standstill wear and
fretting corrosion of the bearing. Ball/plate tests proved the wear-
reducing properties of the grease.
4. GRease
TempeRaTURe incRease
Tem
pera
ture
incr
ease
at
the
bear
ing
inne
r rac
e [ ℃
]
Rotational speed [min-1]
35
30
25
20
15
10
5
0500 1500 2500 3500 55004500
Brea
kout
torq
ue [N
m]
0.20
0.15
0.10
0.05
0.00Unsealed Sealed
Axia
l dev
iatio
n [µ
m]
Axial load [kN]
25
20
15
10
5
00 2 4 6 8 10 12 14 16 18 20 22
Wea
r rat
io
Lithium soap grease NTN special grease L588
1.2
1
0.8
0.6
0.4
0.2
0
Fr
Ball
Plate
Oscillation
BReakoUT ToRqUe
Tem
pera
ture
incr
ease
at
the
bear
ing
inne
r rac
e [ ℃
]
Rotational speed [min-1]
35
30
25
20
15
10
5
0500 1500 2500 3500 55004500
Brea
kout
torq
ue [N
m]
0.20
0.15
0.10
0.05
0.00Unsealed Sealed
Axia
l dev
iatio
n [µ
m]
Axial load [kN]
25
20
15
10
5
00 2 4 6 8 10 12 14 16 18 20 22
Wea
r rat
io
Lithium soap grease NTN special grease L588
1.2
1
0.8
0.6
0.4
0.2
0
Fr
Ball
Plate
Oscillation
aXiaL RiGidiTyTe
mpe
ratu
re in
crea
se
at th
e be
arin
g in
ner r
ace
[ ℃]
Rotational speed [min-1]
35
30
25
20
15
10
5
0500 1500 2500 3500 55004500
Brea
kout
torq
ue [N
m]
0.20
0.15
0.10
0.05
0.00Unsealed Sealed
Axia
l dev
iatio
n [µ
m]
Axial load [kN]
25
20
15
10
5
00 2 4 6 8 10 12 14 16 18 20 22
Wea
r rat
io
Lithium soap grease NTN special grease L588
1.2
1
0.8
0.6
0.4
0.2
0
Fr
Ball
Plate
Oscillation
amoUnT of weaR
Tem
pera
ture
incr
ease
at
the
bear
ing
inne
r rac
e [ ℃
]
Rotational speed [min-1]
35
30
25
20
15
10
5
0500 1500 2500 3500 55004500
Brea
kout
torq
ue [N
m]
0.20
0.15
0.10
0.05
0.00Unsealed Sealed
Axia
l dev
iatio
n [µ
m]
Axial load [kN]
25
20
15
10
5
00 2 4 6 8 10 12 14 16 18 20 22
Wea
r rat
io
Lithium soap grease NTN special grease L588
1.2
1
0.8
0.6
0.4
0.2
0
Fr
Ball
Plate
Oscillation
BALL SCREW SUPPORT BeARING UNIT
distributed by:
BSTU designation
BSTU Table(1)The BSTU series produced by NTN are characterized by the highest basic load rating, which ensures a long service life. In this way, NTN contributes to the protection of the environment. In addition, BSTU bearings are very simple to install.
• Long service life and rigidity • High precision
• Low temperature development • Low frictional torque
Technical characteristics1. HiGHesT Basic Load RaTinGBsTU bearings by nTn feature the highest basic load rating available. nTn
achieved this by optimising the inner bearing geometry. in addition to a larger
ball diameter, BsTU bearings are equipped with a larger quantity of balls.
3. appLicaTion-opTimised GReasea special polyurea-based, long-life grease reduces standstill and vibration
rubbing wear (fretting corrosion).
2. LiGHT conTacT-Type seaL• Optimum sealing effect
• Lowest frictional torque
The sealing lip of the LX seal represents the optimum solution in regard to sealing
effect and frictional torque. BsTU bearings by nTn are equipped with these seals
on both sides of the bearing.
as an option, BsTU bearings are available with service lubrication openings and a groove in the outer race.
BsTU bearings are also available as paired sets (suffix: d2).
4. simpLe moUnTinG pRocessBsTU bearings can be simply bolted to the housing, thanks to the pre-drilled
through holes.
Dynamically equivalent loadPa =XFr + YFa
Statically equivalent loadPor =Fa + 3.98Fr
Fa/Fr Fa/Fr
X Y1.902.17 0.55
X Y0.92 1
ee
e
Fitting of modification partsShaft Housing
h5 H6
Series Bore diameter Outside diameter SealLLX: NTN special seal
Preload Accuracy
BSTU 30 80 LLX
(No code):Single bearing type D2:Double bearing type
GNP4UP42U
GreaseL588: Special polyurea grease
L588
t
60°PD d
r
r
B
d3
d<60
daDa d1 d2
d4
t
d≧60
BSTU2068
BSTU2575
BSTU3080
BSTU30100
BSTU40100
BSTU40115
BSTU50115
BSTU90190
BSTU100200
Ø20
Ø25
Ø30
Ø30
Ø40
Ø40
Ø50
Ø90
Ø100
0
0
0
0
0
0
0
0
0
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.008
-0.008
Ø68
Ø75
Ø80
Ø100
Ø100
Ø115
Ø115
Ø190
Ø200
0
0
0
0
0
0
0
0
0
4X90°("D2": 8x45°)
4X90°("D2": 8x45°)
6X60°("D2": 12x30°)
4X90°("D2": 8x45°)
12X30°("D2": 12x30°)
6X60°("D2": 12x30°)
8X45°(d4=18,t=10.6)(3)(4)
8X45°(d4=18,t=10.6)(3)(4)
8X45°(3)
-0.01
-0.01
-0.01
-0.01
-0.01
-0.01
-0.01
-0.015
-0.015
28
28
28
38
34
46
34
55
55
0
0
0
0
0
0
0
0
0
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
30.1
36.1
41.1
47.1
54.1
61.1
68.1
116
128
43
49
54
65
68.9
80.2
82.9
139
151
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
53
58
63
80
80
94
94
165
175
6.8
6.8
6.8
8.8
8.8
8.8
8.8
11
11
42
48
53
64
68
80
82
137
150
26
32
37
39
49
52
62
104
116
M6
M6
M6
M8
M8
M8
M8
M10
M10
31
34
36.5
73.5
52
89
57
158
160
48
58
68.5
121
106
167
135
415
435
2100
2400
2700
4800
3200
5800
3800
8200
8800
6000
5000
4500
4000
3500
3200
2800
1700
1500
0.6
0.72
0.78
1.71
1.46
2.57
1.87
7.95
8.47
0.2
0.3
0.3
0.8
0.4
1.1
0.5
1.5
1.7
675
790
900
1040
1050
1250
1300
2010
2130
150
230
315
495
780
1190
1080
4600
5800
0.25
0.45
0.68
1.99
2.16
5.52
5.06
60.0
83.8
4
4
4
4
4
4
4
5
5
2
2
2.5
2.5
2.5
2.5
2.5
3
3
d D B d1 d2r
min.P d3 dyn. Ca stat. CoaDa
max.da
min.Quantity
X tµm
max.µm
max.
P4U P42U
N min-1 kg Nm N/µm Nm/mrad kg・cm2Screws( 5)
Dimensions(mm)
Axial basic load rating values
(kN)
Screwsand
atachment holes
Mountingdimensions
(mm)
Bearingpreload
(GN)
Limit valueof rotational
speed(Grease)
Weight
Bearingfrictionmoment
( 1)
Axialbearingrigidity
Rigidityagainsttilting
Massmomentof inertia
( 2 )
Axial runout of the innerrace lateral surface in relation to
the inner race track, SiaBearingdesignation
Mounting dimensionsBearing dimensions
(1) Reference value. (2) Mass moment of inertia of the inner race. (3) For these installation sizes there are no paired versions (D2) available.(4) Attachment holes have counter bores based on DIN 974-1. (5) Screws are based on DIN EN ISO 4762 10.9. Please note screws are not included in the packages of bearings.
Dynamically equivalent loadPa =XFr + YFa
Statically equivalent loadPor =Fa + 3.98Fr
Fa/Fr Fa/Fr
X Y1.902.17 0.55
X Y0.92 1
ee
e
Fitting of modification partsShaft Housing
h5 H6
Series Bore diameter Outside diameter SealLLX: NTN special seal
Preload Accuracy
BSTU 30 80 LLX
(No code):Single bearing type D2:Double bearing type
GNP4UP42U
GreaseL588: Special polyurea grease
L588
t
60°PD d
r
r
B
d3
d<60
daDa d1 d2
d4
t
d≧60
BSTU2068
BSTU2575
BSTU3080
BSTU30100
BSTU40100
BSTU40115
BSTU50115
BSTU90190
BSTU100200
Ø20
Ø25
Ø30
Ø30
Ø40
Ø40
Ø50
Ø90
Ø100
0
0
0
0
0
0
0
0
0
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.008
-0.008
Ø68
Ø75
Ø80
Ø100
Ø100
Ø115
Ø115
Ø190
Ø200
0
0
0
0
0
0
0
0
0
4X90°("D2": 8x45°)
4X90°("D2": 8x45°)
6X60°("D2": 12x30°)
4X90°("D2": 8x45°)
12X30°("D2": 12x30°)
6X60°("D2": 12x30°)
8X45°(d4=18,t=10.6)(3)(4)
8X45°(d4=18,t=10.6)(3)(4)
8X45°(3)
-0.01
-0.01
-0.01
-0.01
-0.01
-0.01
-0.01
-0.015
-0.015
28
28
28
38
34
46
34
55
55
0
0
0
0
0
0
0
0
0
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
30.1
36.1
41.1
47.1
54.1
61.1
68.1
116
128
43
49
54
65
68.9
80.2
82.9
139
151
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
53
58
63
80
80
94
94
165
175
6.8
6.8
6.8
8.8
8.8
8.8
8.8
11
11
42
48
53
64
68
80
82
137
150
26
32
37
39
49
52
62
104
116
M6
M6
M6
M8
M8
M8
M8
M10
M10
31
34
36.5
73.5
52
89
57
158
160
48
58
68.5
121
106
167
135
415
435
2100
2400
2700
4800
3200
5800
3800
8200
8800
6000
5000
4500
4000
3500
3200
2800
1700
1500
0.6
0.72
0.78
1.71
1.46
2.57
1.87
7.95
8.47
0.2
0.3
0.3
0.8
0.4
1.1
0.5
1.5
1.7
675
790
900
1040
1050
1250
1300
2010
2130
150
230
315
495
780
1190
1080
4600
5800
0.25
0.45
0.68
1.99
2.16
5.52
5.06
60.0
83.8
4
4
4
4
4
4
4
5
5
2
2
2.5
2.5
2.5
2.5
2.5
3
3
d D B d1 d2r
min.P d3 dyn. Ca stat. CoaDa
max.da
min.Quantity
X tµm
max.µm
max.
P4U P42U
N min-1 kg Nm N/µm Nm/mrad kg・cm2Screws( 5)
Dimensions(mm)
Axial basic load rating values
(kN)
Screwsand
atachment holes
Mountingdimensions
(mm)
Bearingpreload
(GN)
Limit valueof rotational
speed(Grease)
Weight
Bearingfrictionmoment
( 1)
Axialbearingrigidity
Rigidityagainsttilting
Massmomentof inertia
( 2 )
Axial runout of the innerrace lateral surface in relation to
the inner race track, SiaBearingdesignation
Mounting dimensionsBearing dimensions
(1) Reference value. (2) Mass moment of inertia of the inner race. (3) For these installation sizes there are no paired versions (D2) available.(4) Attachment holes have counter bores based on DIN 974-1. (5) Screws are based on DIN EN ISO 4762 10.9. Please note screws are not included in the packages of bearings.
Dynamically equivalent loadPa =XFr + YFa
Statically equivalent loadPor =Fa + 3.98Fr
Fa/Fr Fa/Fr
X Y1.902.17 0.55
X Y0.92 1
ee
e
Fitting of modification partsShaft Housing
h5 H6
Series Bore diameter Outside diameter SealLLX: NTN special seal
Preload Accuracy
BSTU 30 80 LLX
(No code):Single bearing type D2:Double bearing type
GNP4UP42U
GreaseL588: Special polyurea grease
L588
t
60°PD d
r
r
B
d3
d<60
daDa d1 d2
d4
t
d≧60
BSTU2068
BSTU2575
BSTU3080
BSTU30100
BSTU40100
BSTU40115
BSTU50115
BSTU90190
BSTU100200
Ø20
Ø25
Ø30
Ø30
Ø40
Ø40
Ø50
Ø90
Ø100
0
0
0
0
0
0
0
0
0
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.005
-0.008
-0.008
Ø68
Ø75
Ø80
Ø100
Ø100
Ø115
Ø115
Ø190
Ø200
0
0
0
0
0
0
0
0
0
4X90°("D2": 8x45°)
4X90°("D2": 8x45°)
6X60°("D2": 12x30°)
4X90°("D2": 8x45°)
12X30°("D2": 12x30°)
6X60°("D2": 12x30°)
8X45°(d4=18,t=10.6)(3)(4)
8X45°(d4=18,t=10.6)(3)(4)
8X45°(3)
-0.01
-0.01
-0.01
-0.01
-0.01
-0.01
-0.01
-0.015
-0.015
28
28
28
38
34
46
34
55
55
0
0
0
0
0
0
0
0
0
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
-0.25
30.1
36.1
41.1
47.1
54.1
61.1
68.1
116
128
43
49
54
65
68.9
80.2
82.9
139
151
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.6
53
58
63
80
80
94
94
165
175
6.8
6.8
6.8
8.8
8.8
8.8
8.8
11
11
42
48
53
64
68
80
82
137
150
26
32
37
39
49
52
62
104
116
M6
M6
M6
M8
M8
M8
M8
M10
M10
31
34
36.5
73.5
52
89
57
158
160
48
58
68.5
121
106
167
135
415
435
2100
2400
2700
4800
3200
5800
3800
8200
8800
6000
5000
4500
4000
3500
3200
2800
1700
1500
0.6
0.72
0.78
1.71
1.46
2.57
1.87
7.95
8.47
0.2
0.3
0.3
0.8
0.4
1.1
0.5
1.5
1.7
675
790
900
1040
1050
1250
1300
2010
2130
150
230
315
495
780
1190
1080
4600
5800
0.25
0.45
0.68
1.99
2.16
5.52
5.06
60.0
83.8
4
4
4
4
4
4
4
5
5
2
2
2.5
2.5
2.5
2.5
2.5
3
3
d D B d1 d2r
min.P d3 dyn. Ca stat. CoaDa
max.da
min.Quantity
X tµm
max.µm
max.
P4U P42U
N min-1 kg Nm N/µm Nm/mrad kg・cm2Screws(5)
Dimensions(mm)
Axial basic load rating values
(kN)
Screwsand
atachment holes
Mountingdimensions
(mm)
Bearingpreload
(GN)
Limit valueof rotational
speed(Grease)
Weight
Bearingfrictionmoment
( 1)
Axialbearingrigidity
Rigidityagainsttilting
Massmomentof inertia
( 2 )
Axial runout of the innerrace lateral surface in relation to
the inner race track, SiaBearingdesignation
Mounting dimensionsBearing dimensions
(1) Reference value. (2) Mass moment of inertia of the inner race. (3) For these installation sizes there are no paired versions (D2) available.(4) Attachment holes have counter bores based on DIN 974-1. (5) Screws are based on DIN EN ISO 4762 10.9. Please note screws are not included in the packages of bearings.
Low-friction contact
labyrinth seal (LX)
Bearing inner race
as an option, BsTU bearings are available with service lubrication openings and a groove in the outer race.
BsTU bearings are also available as paired sets (suffix: d2).