E-1
STR
OK
E BU
SH
STROKE BUSHSLIDE ROTARY BUSH
STROKE BUSHSTRUCTURE AND ADVANTAGES E-2ALLOWABLE SPEED FOR COMBINED ROTATION AND STROKE MOTION E-2RATED LOAD AND RATED LIFE ・・ E-2FIT ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ E-3USE AND HANDLING PRECAUTIONS E-5DIMENSION TABLE ・・・・・・・・・・・・・・・ E-6〜
SLIDE ROTARY BUSH SRE SERIESSTRUCTURE AND ADVANTAGES E-10RATED LOAD AND RATED LIFE ・・ E-12APPLICATION EXAMPLES ・・・・・・・・ E-14USE AND HANDLING PRECAUTIONS E-15FELT SEAL ・・・・・・・・・・・・・・・・・・・・・・・ E-15DIMENSION TABLE ・・・・・・・・・・・・・・・ E-16〜
SLIDE ROTARY BUSH RK TYPESTRUCTURE AND ADVANTAGES E-26LIFE CALCULATION ・・・・・・・・・・・・・・ E-26DIMENSION TABLE ・・・・・・・・・・・・・・・ E-27
STROKE BUSHThe NB stroke bush is a linear and rotational motion mechanism utilizing the rotational motion of ball elements between an outer cylinder and a shaft. It is compact and can withstand high loading. The retainer is made of a light metal alloy with high wear resistance. Smooth motion is achieved under high-speed and high-acceleration conditions.Although the linear motion is limited to a specific stroke length, the combined rotation and stroke motion is achieved with very little frictional resistance. The NB stroke bush can be conveniently used in a variety of applications.
STRUCTURE AND ADVANTAGESThe retainer in the NB stroke bush positions the ball elements in a zigzag arrangement. The inner surface of the outer cylinder is finished by precision grinding, resulting in smooth motion of the ball elements. Each of the ball elements is held in a separate hole and smooth motion is achieved for both rotational motion and linear motion. The retainer moves half the length of the linear motion, therefore, the stroke length is limited to approximately twice the length the retainer can travel within the outer cylinder.
High PrecisionHigh-carbon chromium bearing steel is used for the outer cylinder. It is heat treated and ground to achieve high rigidity and accuracy.
Ease of Mounting and ReplacementThe highly accurate fabrication of the NB stroke bush results in uniform dimensions, facilitating parts replacement and housing fabrication.
Light Weight and Space SavingThe use of an aluminum alloy for the retainer and the thin-wall outer cylinder makes the NB stroke bush light weight and compact.
LubricationOne lubrication hole is provided on each oil groove of the outer cylinder, making it easy to lubricate the SR stroke bush.
Figure E-1 Structure of SR Stroke Bush
outer cylinder
seal
ball elements
retainer
stopper ring
linear motion
rotation
FIT
The fits generally used between the shaft and the housing are listed in Table E-2. The inner contact diameters of the SR stroke bush are listed in the dimension tables. The shaft diameter tolerance should be selected to achieve the desired amount of radial clearance (see Table E-3). Please pay attention that high-speed linear motion can cause the retainer to slip due to inertial force.In selecting a shaft, please take note of:Hardness: 58HRC or more (refer to hardness coefficient on page Eng-5) recommendedSurface Roughness: less than Ra0.4 recommended
RATED LOAD AND RATED LIFE
The relationship between the rated load and life of the stroke bush is expressed as follows:
L: rated life fH: hardness coefficientfT: temperature coefficient fC: contact coefficient fW: applied load coefficientC: basic dynamic load rating (N) P: applied load (N)※Refer to page Eng-5 for the coefficients.
Table E-2
Table E-3 Radial Clearance Negative Limit
part number6
8〜1012〜1620〜3035〜5060〜80
100
limit (μm)− 2− 3− 4− 5− 6− 8−10
normal operating condition vertical use or highly accurate case
shaftk5,m5
housingH6,H7
shaftn5,p6
housingJ6,J7
The allowable speed for combined rotation and stroke motion is obtained from the following equation:The value of DN is given as follows depending on the lubrication method.
ALLOWABLE SPEED FOR COMBINED ROTATION AND STROKE MOTION
DN≧dm・n+10・S・n1
note……n≦5,000 S・n1≦50,000
for oil lubricationfor grease lubrication
DN=600,000DN=300,000
●For combined rotation and stroke motion
●For stroke motion
Lh= L600・S・n1/(π・dm)
Lh: life time (hr) S: stroke length (mm)n: revolutions per min. (rpm) n1: number of cycles per minute (cpm) dm: ball pitch diameter (mm) ≒ 1.15 dr
Lh= L60(dm・n)2+(10・S・n1)2/dmL=(fH・fT・fC
fW ・CP )3
×106
TYPE
Standard Type Double Retainer TypeSR TYPE
P.E-6
SR-B TYPE
P.E-8
Table E-1 Type
E-2 E-3
STROKE BUSHS
TRO
KE B
US
H
MOUNTING
Examples of mounting methods of Stroke Bush are shown in Figure E-2. To avoid deformation, do not fix outer cylinder by using set screw.
Figure E-2 Mounting Method
using retaining rings using holding plates using set screws
LUBRICATION
Appropriate lubrication is needed to ensure the accuracy of NB Stroke Bush and to maintain bearing life. Anti-rust oil is applied to NB Stroke Bush prior to shipment. The NB selected anti-rust oil has a little to no effect on lubricants, however, please apply lubricant only after cleaning Stroke Bush with kerosene, etc.
Grease LubricantPrior to usage, please apply grease, and re-lubricate periodically according to the operating conditions. (Lithium soap-based grease is recommended.) Relubrication can be done by directly applying grease inside the ball bush or by using oil hole as Figure E-3 shows.A special low dust generation grease is optional for clean room application. Please refer to page Eng-39.
Oil LubricantPrior to usage, please apply oil directly to the shaft surface or by using oil hole as Figure E-3 shows.Turbine oil (ISO standard VG32-68) is recommended.
Figure E-3 Oil hole
Oil groove
Oil hole
The accuracies of the SR stroke bush are stated in the dimension tables. Since the outer cylinder deforms due to tension from the retaining ring, the dimension of the outer cylinder is an average value at points P,where calculated using the following equation:
W: the distance from the end of the outer cylinder to measurement point PL: the length of the outer cylinder
W=4+L/8
USE AND HANDLING PRECAUTIONS
Maximum StrokeThe maximum stroke in the dimension table is the stroke limit.
Retainer SlippageThe retainer can slip under high-speed motion, vertical application, unbalanced-loading, and vibrating conditions.It is suggested that the stroke to be set as a 80% of the maximum stroke in the dimension table. It is also recommended that the bush be cycled to perform the maximum stroke several times, so that the retainer returns to its central position.
Accuracy
Operating Temperature RangeThe operating temperature is ranging from -20 ℃ to 110℃. In case of operation at temperature outside this range, please contact NB.
Dust PreventionDust and other contaminations affect the bush's lifetime and accuracy if dust or particle enter into inside of bush. Although seals work under a normal environment, in a harsh environment, it is necessary to attach protective covers.
Figure E-4 Outer Cylinder Measurement Points
W WL
P P stopperring
E-4 E-5
STROKE BUSHS
TRO
KE B
US
H
SR TYPE−Standard Type−
part number structure
inner contact diameter (dr)SR type
SR
major dimensions
part number
SR 6SR 8SR 10SR 12SR 16SR 20SR 25SR 30SR 35SR 40SR 50SR 60SR 80SR100
19 24 30 32 40 50 50 82 92108138138132132
mm
mass
g
LfT T
tD dr
2-dr
dr dynamicCN
staticCoN
basic load ratingf
mmtoleranceμm
maximum stroke
mm33333333333333
6 8 10 12 16 20 25 30 35 40 50 60 80100
+22+13
+27+16
+33+20
+41+25
+49+30+58/+36
11.3 17.1 22.7 24.5 29.1 35.8 35.8 53.5 58.5 68.3 86.4 86.4 86 86
216343637
1,0701,1801,2601,3302,9903,1404,1205,5405,9807,8408,430
1N≒0.102kgf
20
number of rows
mm
Dtoleranceμm
12 15 19 23 28 32 37 45 52 60 72 85110130
0−11
0−13
0−16
0−19
0−220/−25
mm
Ltolerancemm
20 24 30 32 37 45 45 65 70 80100100100100
0 −0.2
0 −0.3
0 −0.4
T
mm 1.1 1.5 1.5 1.5 1.5 2 2 2.5 2.5 2.5 3 3 3 3
t
mm 0.5 0.5 0.5 0.5 0.7 0.7 0.7 1 1 1 1 1 1.5 1.5
d
mm 1 1.2 1.2 1.2 1.3 1.5 1.6 2 2 2 2.5 2.5 2.5 2.5
r
mm 0.5 0.5 0.5 0.5 0.5 0.5 1 1 1.5 1.5 1.5 2 2 2
147245461813990
1,1701,3303,1403,5304,8006,9108,230
12,20014,700
8.9 15.6 28.8 42 71 99 117 205 329 516 827 1,240 2,050 2,440
SR-UU TYPE−Standard Type with Seals−
part number structure
major dimensions
part number
SR 8UUSR 10UUSR 12UUSR 16UUSR 20UUSR 25UUSR 30UUSR 35UUSR 40UUSR 50UUSR 60UUSR 80UUSR100UU
14 16 18 26 36 36 68 76 91116117110110
mm
mass
g
LfT T
tD dr
2-dr
dr dynamicCN
staticCoN
basic load ratingf
mmtoleranceμm
maximum stroke
mm3333333333333
8 10 12 16 20 25 30 35 40 50 60 80100
+22+13+27+16
+33+20
+41+25
+49+30+58/+36
12.3 15.5 17.1 21.1 26.8 26.8 45.1 50.1 59.9 77.4 77.4 77 77
343637
1,0701,1801,2601,3302,9903,1404,1205,5405,9807,8408,430
1N≒0.102kgf
number of rows
mm
Dtoleranceμm
15 19 23 28 32 37 45 52 60 72 85110130
0/−11
0−13
0−16
0−19
0−220/−25
mm
Ltolerancemm
24 30 32 37 45 45 65 70 80100100100100
0 −0.2
0 −0.3
0 −0.4
T
mm 1.5 1.5 1.5 1.5 2 2 2.5 2.5 2.5 3 3 3 3
t
mm 0.5 0.5 0.5 0.7 0.7 0.7 1 1 1 1 1 1.5 1.5
d
mm 1.2 1.2 1.2 1.3 1.5 1.6 2 2 2 2.5 2.5 2.5 2.5
r
mm 0.5 0.5 0.5 0.5 0.5 1 1 1.5 1.5 1.5 2 2 2
245461813990
1,170 1,330 3,140 3,530 4,800 6,910 8,23012,20014,700
15.6 28.8 42 71 99 117 205 329 516 827 1,240 2,050 2,440
inner contact diameter (dr)
SR type
SR 20 UU
seals on both sides
exampleexample
E-6 E-7
STROKE BUSHS
TRO
KE B
US
H
SR-B TYPE−Double Retainer Type−
part number structure
major dimensions
part number
SR 8BSR 10BSR 12BSR 16BSR 20BSR 25BSR 30BSR 35BSR 40BSR 50BSR 60BSR 80BSR100B
8 8 816202044546688887676
mm
mass
g
LfT T
tD dr
2-dr
dr dynamicCN
staticCoN
basic load ratingf
mmtoleranceμm
maximum stroke
mm6666666666666
8 10 12 16 20 25 30 35 40 50 60 80100
+22+13+27+16
+33+20
+41+25
+49+30+58/+36
17.1 22.7 24.5 29.1 35.8 35.8 53.5 58.5 68.3 86.4 86.4 86 86
5491,0301,7201,9102,0602,1704,8005,0506,7108,9709,700
12,70013,700
1N≒0.102kgf
number of rows
mm
Dtoleranceμm
15 19 23 28 32 37 45 52 60 72 85110130
0/−11
0−13
0−16
0−19
0−220/−25
mm
Ltolerancemm
24 30 32 37 45 45 65 70 80100100100100
0 −0.2
0 −0.3
0 −0.4
T
mm 1.5 1.5 1.5 1.5 2 2 2.5 2.5 2.5 3 3 3 3
t
mm 0.5 0.5 0.5 0.7 0.7 0.7 1 1 1 1 1 1.5 1.5
d
mm 1.2 1.2 1.2 1.3 1.5 1.6 2 2 2 2.5 2.5 2.5 2.5
r
mm 0.5 0.5 0.5 0.5 0.5 1 1 1.5 1.5 1.5 2 2 2
490931
1,6301,9802,3202,6706,2707,0609,560
13,80016,50024,30029,400
16.8 31.2 46 75 106 125 220 346 540 862 1,290 2,110 2,520
SR-BUU TYPE−Double Retainer Type with Seals−
part number structure
major dimensions
part number
SR 30BUUSR 35BUUSR 40BUUSR 50BUUSR 60BUUSR 80BUUSR100BUU
30384966675454
mm
mass
g
LfT T
tD dr
2-dr
dr dynamicCN
staticCoN
basic load ratingf
mmtoleranceμm
maximum stroke
mm6666666
30 35 40 50 60 80100
+33/+20
+41+25
+49+30+58/+36
45.1 50.1 59.9 77.4 77.4 77 77
4,8005,0506,7108,9709,700
12,70013,700
1N≒0.102kgf
number of rows
mm
Dtoleranceμm
45 52 60 72 85110130
0/−16
0−19
0−220/−25
mm
Ltolerancemm
65 70 80100100100100
0 −0.3
0 −0.4
T
mm 2.5 2.5 2.5 3 3 3 3
t
mm 1 1 1 1 1 1.5 1.5
d
mm 2 2 2 2.5 2.5 2.5 2.5
r
mm 1 1.5 1.5 1.5 2 2 2
6,270 7,060 9,56013,80016,50024,30029,400
220346540862
1,2902,1102,520
inner contact diameter (dr)
SR type
SR 20 B
double retainer inner contact diameter (dr)
SR type
SR 30 B
double retainer
UU
seals on both sides
example example
E-8 E-9
STROKE BUSHS
TRO
KE B
US
H
SLIDE ROTARY BUSH SRE SERIES
The NB Slide Rotary Bush SRE Series provides rotary and linear motion functions. Linear motion with unlimited stroke and rotary motion are merged into a single bush resulting in great space saving compared with a combination of any conventional bearings. There are three types; standard, flange, and unit type with sizes ranging from 6 to 40.
STRUCTURE AND ADVANTAGES
NB Slide Rotary Bush features a special retainer fitted into cylindrical steel outer cylinder and is designed to guide steel balls for smooth circulation in its retainer. The retainer is also designed to rotate freely towards radial direction and offers smooth linear and rotary motions.
Smooth OperationThe inner surface of the outer cylinder allows smooth operation of linear and rotary motions while maintaining a uniform load distribution.
High Load CapacityThe use of comparatively large diameter steel balls enhances the load capacity.
Smooth RotationThe positioning of the steel balls in a cylindrical formation inside the retainer enables a smooth rotational motion regardless of the installation direction.
Complete InterchangeabilityNB Slide Rotary series is completely interchangeable with SM type Slide Bush, SMK type Flanged Slide Bush and SMA(W) type, AK(W) type and SMP type.
Figure E-5 Structure of Slide Rotary Bush SRE type
retainer
outer cylinder
side ring
ball ellements
rotation
linear motion
TYPE
Standard Type
Block TypeUnit
Square Flange Type
Double-Wide Block Type
SRE TYPE
SMA-R TYPE
AK-R TYPE
SMP-R TYPE
P.E-16
P.E-20
P.E-22
P.E-24
SREK TYPE
SMA-RW TYPE
AK-RW TYPE
P.E-18
P.E-21
P.E-23
Table E-4 Type
E-10
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-11
RATED LOAD AND RATED LIFE
Equation(1)gives the relation between the applied load and the rated life of the slide rotary bush.
L: rated life (rotations) fH: hardness coefficient fT: temperature coefficient fC: contact coefficient fW: applied load coefficient C: basic dynamic load rating (N)P: applied load (N) ※Refer to page Eng-5 for the coefficients.
Since the slide rotary bush is used in applications with combined linear and rotary motions, the life time is obtained using Equations(2)and(3).
●When only linear motion is involved
Lh= L600・S・n1/(π・dm)
Lh: life time (hr) S: stroke length (mm) n: revolutions per minute (rpm) n1: number of cycles per minute (cpm)dm: ball pitch diameter (mm)≒1.15dr (dr is the inner contact diameter of the SRE series)
Lh= L60(dm・n)2+(10・S・n1)2/dm
The rated life and load rating are defined as follows.
Rated LifeWhen a group of slide rotary bearings of the same type are used under the same conditions, the rated life is defined as the total number of rotations made without causing flaking by 90% of the bearings.
Basic Dynamic Load Rating The basic dynamic load rating is defined as the load with a constant magnitude and direction at which a rated life of 106 rotations can be achieved.
Basic Static Load Rating The basic static load rating is defined as the load with a constant direction that would result in a certain contact stress at the mid-point of the rolling element and tracking surface that are experiencing the maximum stress.
●When linear and rotary motions are combined
……………(3)
…(2)
Calculation ExampleThe life of SRE20 type NB slide rotary bush is calculated based on the following conditions.●Conditions Motion: Linear and rotational combined Load: P=30N Stroke: S=200mm Revolutions per minute: n=15rpm Number of cycles per minute: n1=10cpm Shaft surface hardness: greater than 58 HRC Operating temperature: room temperature Other: single shaft with single bush●Calculation Basic dynamic load rating: C=647 N Based on the above conditions, the life is calculated using the following coefficient values. Hardness coefficient fH=1, Temperature coefficient fT=1, Contact coefficient fC=1 Applied load coefficient, fW=1.5 Rated life
Life (in hours)
L=(fH・fT・fCfW ・C
P )3………………(1)×106
L=(fH・fT・fCfW
・CP)3
= 2,972 × 106(rotations)=( 1×1×11.5 ・647
30 )3
Lh=L
60(dm・n)2+(10・S・n1)2/dm
=2,972×106
60(1.15×20×15)2+(10×200×10)2/(1.15×20)=56,900(h)
×106
MOUNTING
Examples of mounting methods are shown in Figure E-6. Please do not fix outer cylinder by using set screw to avoid deformation.
Figure E-6 Mounting Method
using retaining rings using holding plates using set screws
FIT
ShaftIn order to ensure high accuracy motion of Slide Rotary Bush SRE type, it is essential to select a high quality shaft. In selecting a shaft, please take note of:
Outer diameter tolerance: g6 recommendedSurface hardness: 58HRC or higher
For a shaft with surface hardness le ss t han 5 8 H RC, make a correction in life calculation by adding hardness coefficient.
Surface roughness: lower than Ra0.4 or better
HousingInner diameter tolerance: H7 recommended
E-12
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-13
APPLICATION EXAMPLES
Application Example 1 Vertical Shaft Robot Arm
Slide Rotary Flange BushSREK type
SPR typeRotary Ball Spline
Application Example 2 Multiple Gearing Idler
Slide Rotary BushSRE type
Application Example 4 Turntable
Slide Rotary UnitSMA-R type
Application Example 3 Tool Changer
Slide Rotary UnitSMP-R type
USE AND HANDLING PRECAUTIONS
LubricationLubrication is needed (1) to prevent heat fusing by reducing friction between the rolling elements and the tracking surface, (2) to reduce wear of the structural elements, and (3) to prevent rusting. Lubrication affects both the performance and life of the bush. A lubrication method and a lubrication agent appropriate to the operating conditions should be selected. For oil lubrication, turbine oil (ISO standard VG32-68) is recommended. For grease lubrication, lithium soap based grease No. 2 is recommended. The replenishment interval depends on the operating conditions.
Dust PreventionDust and other contaminants affect the bush's lifetime and accuracy. Appropriate prevention methods are thus important.
Operating Temperature RangeThe operating temperature is ranging from −20℃ to 110℃. In case of operation at a temperature outside this range, please contact NB.
Retainer MaterialThe standard material of SRE Retainer is stainless steel. When requiring other material, please contact NB.
FELT SEAL
A felt seal FLM strengthens lubrication characteristics and extends relubrication period of the slide rotary bush.
Figure E-7 Felt Seal
Table E-4 Felt Seal Dimensions
part number
FLM 6FLM 8FLM 10FLM 12FLM 13FLM 16FLM 20FLM 25FLM 30FLM 40
major dimensions(mm)
6 81012131620253040
applicableslide rotary bush
SRE 6SRE 8SRE 10SRE 12SRE 13SRE 16SRE 20SRE 25SRE 30SRE 40
d12151921232832404560
D2233344555
B
B
d D
steel
felt
Figure E-8 Example of InstallationInstallationThe felt seal does not work as a retaining ring. Figure E-5 shows how to install the felt seal.
E-14
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-15
19242930323742596480
mass
g
1N≒0.102kgf
dynamicCN
staticCoN
drmajor dimensions
part number
SRE 6SRE 8SRE10SRE12SRE13SRE16SRE20SRE25SRE30SRE40
6 81012131620253040
SRE TYPE− Standard type −
part number structure
inner contact diameter (dr)SRE type
example SRE 25
mmtolerance
μm mmtolerance
μm
+4−5
+3−6
+3−7
+3/−8
12151921232832404560
0−11
0−13
0−16
0/−19
D
78137157274323451647882
1,1801,960
176314372588686882
1,1801,8602,6504,020
10 20 39 42 56 97133293371778
basic load ratingW
mm
D1
mm 11.5 14.3 18 20 22 27 30.5 38 43 57
D
W
dr
W
B
L
D1
13.5 17.5 22 23 23 26.5 30.5 41 44.5 60.5
0 −0.2
0 −0.3
0 −0.2
0 −0.3
mmtolerance
mm
L
mmtolerance
mm
Ballowablerevolutionsper minute
rpm300300300300300250250250200200
part number
SRE 6SRE 8SRE10SRE12SRE13SRE16SRE20SRE25SRE30SRE40
1.1 1.1 1.3 1.3 1.3 1.6 1.6 1.85 1.85 2.1
※If the inner contact diameter exceeds 40 mm, please contact NB.
E-16
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-17
SREK TYPE− Square Flange type −
part number structure
Dmajor dimensions
part number
SREK 6SREK 8SREK10SREK12SREK13SREK16SREK20SREK25SREK30
mmtolerance
μmmm0
−13
0−16
0−19
6 810121316202530
121519212328324045
L±0.3mm192429303237425964
283240424348546274
Dfmm
Kmm222530323437425058
5 5 6 6 6 6 8 810
tmm
flange
inner contact diameter (dr)SREK type
example SREK 25
toleranceμm
dr
+4−5
+3−6
+3−7
Df
P.C.D.
Y
X
Z
L
dr
D
K
t
mounting hole X 4
1N≒0.102kgf
dynamicCN
staticCoN
basic load rating
part number
SREK 6SREK 8SREK10SREK12SREK13SREK16SREK20SREK25SREK30
P.C.D.mm
X×Y×Zmm
perpendicularity
μm
mass
g202429323338435160
3.5×6×3.13.5×6×3.1
4.5×7.5×4.14.5×7.5×4.14.5×7.5×4.14.5×7.5×4.15.5×9×5.15.5×9×5.16.6×11×6.1
12
15
78137157274323451647882
1,180
176314372588686882
1,1801,8602,650
21 33 61 67 83126178355483
300300300300300250250250200
allowable revolutionsper minute
rpm
E-18
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-19
SMA-R TYPE−Block type−
part number structure
major dimensions
part number
SMA 6RSMA 8RSMA10RSMA12RSMA13RSMA16RSMA20RSMA25RSMA30RSMA40R
mm
mass
g
L
C±0.2W
K B±0.2
E±0.02
T
G F
h±0.02
4-S2
f
4-S1
NB mark
inner contact diameter dynamicCN
staticCoN
basic load rating
toleranceμm
6 81012131620253040
+4−5
+3−6
+3−7
+3/−8
9111315151921263040
78137157274323451647882
1,1801,960
1N≒0.102kgf
176314372588686882
1,1801,8602,6504,020
335593
104128216286645824
1,719
SMA-RW TYPE−Double-Wide Block type−
part number structure
L
C±0.2
W
K B±0.2
E±0.02
T
GF
h±0.02
4-S2
N4-S1
f
A-M6×1
NB mark
SMA-R type
example SMA 25 R
inner contact diameter
hmm
15172021222527383951
Emm
30 34 40 42 44 50 54 76 78102
Wmm
Lmm25303536394450677290
18 22 26 28 30 38.5 41 51.5 59.5 78
Fmm
Gmm 15 18 21 24 24.5 32.5 35 42 49 62
6 6 8 8 8 911121520
Tmm
Bmm 20 24 28 30.5 33 36 40 54 58 80
15182126263440505860
Cmm
Kmm
5 5 6 5.75 5.5 7 7 11 10 11
M4M4M5M5M5M5M6M8M8M10
S1 fmm 8 81212121212181825
3.4 3.4 4.3 4.3 4.3 4.3 5.2 7 7 8.7
S2
mm
allowable revolutions per minuterpm
outer dimensions mounting dimensions
SMA-R type
SMA 25 R
inner contact diameter
W
double type
major dimensions
part number
SMA 6RWSMA 8RWSMA10RWSMA12RWSMA13RWSMA16RWSMA20RWSMA25RWSMA30RWSMA40RW
mm
mass
g
inner contact diameter dynamicCN
staticCoN
basic load rating
toleranceμm
6 81012131620253040
+4−5
+3−6
+3−7
+3/−8
9111315151921263040
126222254444523731
1,0501,4301,9103,180
1N≒0.102kgf
352628744
1,1801,3701,7602,3603,7205,3008,040
68113188210254431568
1,2821,6383,419
hmm
15172021222527383951
Emm
30 34 40 42 44 50 54 76 78102
Wmm
Lmm 48 58 68 70 75 85 96130140175
18 22 26 28 30 38.5 41 51.5 59.5 78
Fmm
Gmm 15 18 21 24 24.5 32.5 35 42 49 62
7 7 7 6.5 6.5 6 7 4 5 5
Tmm
Bmm 20 24 28 30.5 33 36 40 54 58 80
36 42 46 50 50 60 70100110140
Cmm
Kmm
5 5 6 5.75 5.5 7 7 11 10 11
M4M4M5M5M5M5M6M8M8M10
S1 fmm 8 81212121212181825
3.4 3.4 4.3 4.3 4.3 4.3 5.2 7 7 8.7
S2
mm
allowable revolutions per minuterpm
outer dimensions mounting dimensions
6 6 8 8 8 911121520
Nmm
example
300300300300300250250250200200
300300300300300250250250200200
E-20
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-21
AK-R TYPE−Compact Block type−
part number structure
W LL2±0.2L1±0.2
E±0.02
tf d
F
h±0.02
2-S12-S2 Hpilot holeS3
NB mark
AK-RW TYPE−Double-Wide Compact Block type−
part number structure
WLL1±0.2L2±0.2
E±0.02
tf d
F
h±0.02
2-S12-S2
Hpilot holeS3
NB mark
AK-R type
example AK 25 R
inner contact diameter
AK-R type
AK 25 R
inner contact diameter
W
double type
example
major dimensions
part number
AK 6RAK 8RAK10RAK12RAK13RAK16RAK20RAK25RAK30R
mm
mass
g
inner contact diameter dynamicCN
staticCoN
basic load rating
toleranceμm
6 810121316202530
+4−5
+3−6
+3−7
141619202527313740
78137157274323451647882
1,1801N≒0.102kgf
176314372588686882
1,1801,8602,650
27 48 94105151238328669856
hmm
81013141518212629
Emm
162026283036425258
Wmm
Lmm273239404247526974
222632344349546571
Fmm
L2
mm182027272832364244
M4M5M6M6M6M6M8M10M10
S1 fmm 8 8.5 9.5 9.5 13.5 13 15 17 17.5
91015151618182222
L1
mmt
mm556677899
3.5 3.5 4.5 4.5 5.2 5.2 7 8.9 8.9
M4M4M5M5M6M6M8M10M10
S3
mmS2 d
mm 6 6 8 8 9 9111414
5 5 6 6 7 7 81010
Hmm
allowable revolutions per minuterpm
outer dimensions mounting dimensions
300300300300300250250250200
major dimensions
part number
AK 6RWAK 8RWAK10RWAK12RWAK13RWAK16RWAK20RWAK25RWAK30RW
mm
mass
g
inner contact diameter dynamicCN
staticCoN
basic load rating
toleranceμm
6 810121316202530
+4−5
+3−6
+3−7
141619202527313740
126222254444523731
1,0501,4301,910
1N≒0.102kgf
352628744
1,1801,3701,7602,3603,7205,300
4889
175196281450626
1,2991,662
hmm
81013141518212629
Emm
162026283036425258
Wmm
Lmm 46 56 68 70 74 84 94128138
222632344349546571
Fmm
L2
mm203036364252588090
M4M5M6M6M6M6M8M10M10
S1 fmm 8 8.5 9.5 9.5 13.5 13 15 17 17.5
30 42 50 50 55 65 70100110
L1
mmt
mm556677899
M4M4M5M5M6M6M8M10M10
3.5 3.5 4.5 4.5 5.2 5.2 7 8.9 8.9
S2 S3
mmd
mm 6 6 8 8 9 9111414
5 5 6 6 7 7 81010
Hmm
allowable revolutions per minuterpm
outer dimensions mounting dimensions
300300300300300250250250200
E-22
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-23
SMP-R TYPE−Pillow Block type−
part number structure
W
B
L
C
M
E±0.1 P
G
F
h±0.02
4-S1
S2
1N≒0.102kgf
dynamicCN
staticCoN
major dimensions
part number
SMP13RSMP16RSMP20RSMP25RSMP30RSMP40R
mm131620253040
basic load rating
252934404560
hmm
Emm
25 27.5 32.5 38 42.5 62
50 55 65 76 85124
Wmm
outer dimensions part number
SMP13RSMP16RSMP20RSMP25RSMP30RSMP40R
Cmm
S1
mm
adjustment screw size
S2
mass
g262935404664
7(M5) 7(M5) 8(M6) 8(M6)10(M8)12(M10)
M5M5M6M6M8M10
323451647882
1,1801,960
686882
1,1801,8602,6504,020
266369690970
1,4203,585
toleranceμm
inner contact diameter
+3−6
+3−7
+3/−8
allowable revolutions per minute
rpm
SMP-R type
example SMP 25 R
inner contact diameter
323742596480
Lmm
46 53 62 73 84112
Fmm
Gmm 81012121518
364048596986
Mmm
Bmm303540505876
Pmm303237434968
mounting dimensions
300250250250200200
E-24
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-25
SLIDE ROTARY BUSH RK TYPE
NB's RK type slide rotary bush is a highly accurate and high load capacity bearing providing smooth continuous linear and rotational motions. Its structure imposes no constraints on linear and rotational motions. It is much more compact than a standard slide bush with separate rotational bearing.
STRUCTURE AND ADVANTAGES
The RK type slide rotary bush uses a retainer similar to that used in the SR type stroke bush. This retainer gives a smooth motion in a high rotational application. SM type slide bush is incorporated, providing the stable and smooth linear motion. Relatively large ball elements are used for high load capacity.
Figure E-9 Structure of RK Slide Rotary Bush
outer cylinder
retainerslide bush
linear motion
rotation
1.A smooth unlimited linear and rotational motion is obtained.
2.There is no need to machine separate housing.
3.High accuracy is ensured for extended period of usage.
4.Its high compatibility eliminates replacement problems.
5.High r ig id i t y enab les i t to withstand an unbalanced load and large load.
※For best performance, please select tolerance of h5 for the shaft.
L: rated life (km) fH: hardness coefficientfT: temperature coefficient fC: contact coefficientfW: applied load coefficientC: basic dynamic load rating (N) P: applied load (N)※Refer to page Eng-5 for the coefficients.
RK TYPE
part number structure
mounting hole x 4
(45°)
Ad(oil hole)
K
P.C.D. Y
Ddr
LtZ
X
Df
major dimensions
part number
RK12GUURK16GUURK20GUURK25GUURK30GUU
mm
mass
g
dr dynamicCN
staticCoN
basic load rating
toleranceμm
1216202530
0− 9
0−10
510774882980
1,5701N≒0.102kgf
7841,1801,3701,5702,740
Dfmm5462748296
Kmm
allowable revolutions per minute rpm
flange
inner contact diameter (dr)
RK type
example RK 25 G
resin retainer
UU
seals on both sides
mm
Dtoleranceμm
3240455260
0−25
0−30
mm
Ltolerancemm
3645506774
±0.3
4250586475
tmm 8 8101013
P.C.D.mm4351606778
5.5×9×5.15.5×9×5.16.6×11×6.16.6×11×6.19×14×8.1
X×Y×Zmm
500500400400400
180280420680990
A
mm
d
mm1519.521.528.531
22333
OH
oil holeblank: without oil holeOH: with oil hole *
-
*Oil hole is for rotary-portion lubrication.
FITShaftIn order to ensure high accuracy motion of Slide Rotary Bush RK type, it is essential to select a high quality shaft. In selecting a shaft, please take note of:
Outer diameter tolerance: h5 recommendedSurface hardness: 58HRC or higher
For a shaft with surface hardness le ss t han 5 8 H RC, make a correction in life calculation by adding hardness coefficient.
Surface roughness: lower than Ra0.4 or better
HousingInner diameter tolerance is not requested. Please insert into an installation bore which is slightly larger than the outer cyliner.
Calculation of Life:
L=(fH・fT・fCfW ・C
P )3×50
E-26
SLIDE ROTARY BUSHS
LIDE R
OTA
RY
BU
SH
E-27