Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Support Unit Document: Types, Specifications, and Installation of Ball Screw Peripherals, Study notes of Life Sciences

Information on the different types and specifications of Support Units for ball screws, including models EK, FK, EF, and FF. It also includes details on the installation process and the recommended shapes of shaft ends for each model. useful for engineers and technicians working with ball screws and related equipment.

Typology: Study notes

2021/2022

Uploaded on 09/27/2022

claire67
claire67 🇬🇧

4.6

(5)

265 documents

1 / 30

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
A15-272
S u p p o r t U n i t
Models EK, BK, FK, EF, BF and FF
Fixed side Supported side
Bearing
Housing
Snap ring
Bearing
Collar
Housing
Lock nut
Set piece
Hexagonal socket-head
setscrew
Holding lid
Seal
Fig.1 Structure of the Support Unit
Structure and Features
The support unit comes in six types: models EK, FK, EF, and FF, which are tailored to model BNK
precision ball screw with fi nished shaft ends, and models BK and BF, which are standardized for
general ball screws.
The support unit on the fi xed side includes a JIS Class 5-compliant angular bearing provided with an
adjusted preload.
The Support Unit on the supported side uses a deep-groove ball bearing.
The internal bearings of the Support Unit models EK, FK and BK contain an appropriate amount of
lithium soap-group grease that is sealed with a special seal. Thus, these models are capable of op-
erating over a long period.
BallScrewCD.indb272 2021/08/0318:35:07
513-2E
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e

Partial preview of the text

Download Support Unit Document: Types, Specifications, and Installation of Ball Screw Peripherals and more Study notes Life Sciences in PDF only on Docsity!

Support Unit

Models EK, BK, FK, EF, BF and FF

Fixed side Supported side

Bearing

Housing

Snap ring

Bearing

Collar

Housing

Lock nut

Set piece

Hexagonal socket-head setscrew

Holding lid

Seal

Fig.1 Structure of the Support Unit

Structure and Features

The support unit comes in six types: models EK, FK, EF, and FF, which are tailored to model BNK

precision ball screw with finished shaft ends, and models BK and BF, which are standardized for

general ball screws.

The support unit on the fixed side includes a JIS Class 5-compliant angular bearing provided with an

adjusted preload.

The Support Unit on the supported side uses a deep-groove ball bearing.

The internal bearings of the Support Unit models EK, FK and BK contain an appropriate amount of

lithium soap-group grease that is sealed with a special seal. Thus, these models are capable of op-

erating over a long period.

Ball Screw Peripherals

Support Unit

Uses the Optimal Bearing

To ensure the rigidity balance with the Ball Screw, the Support Unit uses an angular bearing (contact

angle: 30; DF configuration) with a high rigidity and a low torque. Miniature Support Unit models

EK/FK 4, 5 and 6 are incorporated with a miniature angular bearing with a contact angle of 45 de-

veloped exclusively for miniature Ball Screws. This bearing has a greater contact angle of 45 and

an increased number of balls with a smaller diameter. The high rigidity and accuracy of the miniature

angular bearing provides the stable rotational performance.

Support Unit Shapes

The square and round shapes are available for the Support Unit to allow the selection according to

the intended use.

Example of Installation

Square Type Round Type

Compact and Easy Installation

The Support Unit is compactly designed to accommodate the space in the installation site. As the

bearing is provided with an appropriately adjusted preload, the Support Unit can be assembled with

a Ball Screw unit with no further machining. Accordingly, the required man-hours in the assembly

can be reduced and the assembly accuracy can be increased.

Ball Screw Peripherals

Support Unit

Types of Support Units and Applicable Screw Shaft Outer Diameters

Inner diameter of fi xed-side Support Unit (mm)

Inner diameter of supported- side Support Unit (mm)

Applicable Model No. of fi xed-side Support Unit

Applicable model No. of the sup- ported side Support Unit

Type BNK with Unfi nished Shaft Ends(Applicable Model No.)

Recommended Shapes of Shaft Ends(Applicable Shaft Outer Diameter D)

Shaft End H (mm) Shaft End J (mm)

4 — EK 4

FK 4

BNK

BNK

5 — EK 5

FK 5 —^ BNK

EK 6

FK 6

EF 6

FF 6

BNK

BNK

BNK

8 6 EK 8

FK 8

EF 8

FF 6

BNK1002  12 ————

EK 10

FK 10

BK 10

EF 10

FF 10

BF 10

BNK

BNK

BNK

BNK

BNK

EK 12

FK 12

BK 12

EF 12

FF 12

BF 12

BNK

BNK

BNK

BNK

BNK

BNK

EK 15

FK 15

EF 15

FF 15

BNK

BNK

BK 15 BF 15 ———— ————  20

17 17 BK 17 BF 17 ———— ————  25

EK 20

FK 20

EF 20

FF 20

BNK

BK 20 BF 20 ———— ————

FK 25 FF 25 ————  36 ————

BK 25 BF 25 ———— ————  36

FK 30 FF 30 ————

BK 30 BF 30 ————

35 35 BK 35 BF 35 ———— ————  45

40 40 BK 40 BF 40 ———— ————

Note1) The Supports Units in this table apply only to those Ball Screw models with recommended shaft ends shapes H, J and K, indicated on (^) A. Note2) For Recommended Shapes of Shaft Ends H, J, and K; refer to pages A to A.

Model Numbers of Bearings and Characteristic Values

Angular ball bearing on the fi xed side Deep-groove ball bearing on the supported side

Support Unit model No.

Bearing

Axial direction Support Unit model No.

Bearing model No.

Radial direction

Basic dynamic load rating Ca (kN)

Note) Permis- sible load (kN)

Rigidity

(N/m)

Basic dynamic load rating C(kN)

Basic static load rating C 0 (kN)

EK 4 FK 4

AC4-

(DF P5)

EK 5

FK 5

AC5-

(DF P5)

EK 6

FK 6

AC6-

(DF P5)

EF 6

FF 6

606ZZ 2.19 0.

EK 8

FK 8

79M8A

(DF P5) 2.93^ 2.15^49 EF 8^ 606ZZ^ 2.19^ 0.

EK 10

FK 10

BK 10

equivalent (DF P5)

EF 10

FF 10

BF 10

608ZZ 3.35 1.

EK 12

FK 12

BK 12

equivalent (DF P5)

EF 12

FF 12

BF 12

6000ZZ 4.55 1.

EK 15

FK 15

BK 15

equivalent (DF P5)

EF 15

FF 15

BF 15

6002ZZ 5.6 2.

BK 17

equivalent (DF P5)

13.7 5.85 125 BF 17 6203ZZ 9.6 4.

EK 20

FK 20

equivalent (DF P5)

EF 20

FF 20

6204ZZ 12.8 6.

BK 20

equivalent (DF P5)

12.7 7.55 140 BF 20 6004ZZ 9.4 5.

FK 25

BK 25

equivalent (DF P5)

FF 25

BF 25

6205ZZ 14 7.

FK 30

BK 30

equivalent (DF P5)

FF 30

BF 30

6206ZZ 19.5 11.

BK 35

equivalent (DF P5)

37.2 21.9 255 BF 35 6207ZZ 25.7 15.

BK 40

equivalent (DF P5)

44.1 27.1 270 BF 40 6208ZZ 29.1 17.

Note) “Permissible load” indicates the static permissible load.

Mounting Procedure

Installing the Support Unit

(1) Install the fi xed side Support Unit with the screw shaft.

(2) After inserting the fi xed side Support Unit, secure the lock nut using the fastening set piece and

the hexagonal socket-head setscrews.

(3) Attach the supported side bearing to the screw shaft and secure the bearing using the snap ring,

and then install the assembly to the housing on the supported side.

Note1) Do no disassemble the Support Unit. Note2) When inserting the screw shaft to the Support Unit, take care not to let the oil seal lip turn outward. Note3) When securing the set piece with a hexagonal socket-head setscrew, apply an adhesive to the hexagonal socket- head setscrew before tightening it in order to prevent the screw from loosening. If planning to use the product in a harsh environment, it is also necessary to take a measure to prevent other components/parts from loosening. Contact THK for details.

Supported side

Bearing

Snap ring

Fixed side

Collar

Set piece

Hexagonal socket-head setscrew

Lock nut

Installation onto the Table and the Base

(1) If using a bracket when mounting the ball screw nut to the table, insert the nut into the bracket

and temporarily fasten it.

(2) Temporarily fasten the fi xed side Support Unit to the base.

In doing so, press the table toward the fi xed side Support Unit to align the axial center, and ad-

just the table so that it can travel freely.

● If using the fi xed side Support Unit as the reference point, secure a clearance between the ball

screw nut and the table or inside the bracket when making adjustment.

● If using the table as the reference point, make the adjustment either by using the shim (for a

square type Support Unit), or securing the clearance between the outer surface of the nut and

the inner surface of the mounting section (for a round type Support Unit).

(3) Press the table toward the fi xed-side Support Unit to align the axial center. Make the adjustment

by reciprocating the table several times so that the nut travels smoothly throughout the whole

stroke, and temporarily secure the Support Unit to the base.

Base

Fixed side support unit

Table Bracket Supported side support unit

Ball Screw Peripherals

Support Unit

Checking the Accuracy and Fully Fastening the Support Unit

While checking the runout of the ball screw shaft end and the axial clearance using a dial gauge,

fully fasten the ball screw nut, the nut bracket, the fixed side Support Unit and the supported-side

Support Unit, in this order.

Adjust the nut by moving the table so that the nut Measure the axial clearance travels smoothly throughout the whole stroke. Measure the runout

Connection with the Motor

(1) Mount the motor bracket to the base.

(2) Connect the motor and the ball screw using a coupling.

Note) Make sure the mounting accuracy is maintained.

(3) Thoroughly perform the break-in for the system.

Motor Coupling

Ball Screw Peripherals

Support Unit

EK Square Type Support Unit on the Fixed Side

2-^ φ d 1 through hole, φ d 2 counter bore depth h

2-^ φ d 1 through hole

Models EK 4 and 5 Models EK 6 and 8

b

H 1

h 1

H

M

P

B 1

B

φ d

L

L 2 L 3

L 1

T

Model No.

Shaft diameter

d L L 1 L 2 L 3 B H b 0. EK 4 4 15 5.5 17.5 3 34 19 17

EK 5 5 16.5 5.5 18.5 3.5 36 21 18

EK 6 6 20 5.5 22 3.5 42 25 21

EK 8 8 23 7 26 4 52 32 26

EK 10 (^10 24 6) 29.5 6 70 43 35

EK 12 (^12 24 6) 29.5 6 70 43 35

EK 15 (^15 25 6 36 5 80 49 )

EK 20 (^20 42 10 50 10 95 58) 47.

Models EK 4 to 8 Part No. Part name No. of units

1 Housing 1 2 Bearing 1 set 3 Set nut 1 4 Collar 2 5 Seal 1 6 Lock Nut 1

7 Hexagonal socket-head setscrew (with a set piece)

BK Square Type Support Unit on the Fixed Side

4-^ φ d 1 through hole, φ d 2 counter bore depth h

T

b

H 1

h 1

H

M

P

B 1

B

Model No.

Shaft diameter

d L L 1 L 2 L 3 B H b 0.

h 1 0.

B 1 H 1

BK 10 10 25 5 29 5 60 39 30 22 34 32.

BK 12 12 25 5 29 5 60 43 30 25 35 32.

BK 15 15 27 6 32 6 70 48 35 28 40

BK 17 17 35 9 44 7 86 64 43 39 50

BK 20 20 35 8 43 8 88 60 44 34 52

BK 25 25 42 12 54 9 106 80 53 48 64

BK 30 30 45 14 61 9 128 89 64 51 76

BK 35 35 50 14 67 12 140 96 70 52 88

BK 40 40 61 18 76 15 160 110 80 60 100

Ball Screw Peripherals

Support Unit

L 2 L 3

C 2

φ d

C 1

L 1 L

Unit: mm

Mass

P C 1 C 2 d 1 d 2 h M T Bearing used kg

46 13 6 6.6 10.8 5 M3 16 7000 equivalent (DF P5) 0.

46 13 6 6.6 10.8 1.5 M3 19 7001 equivalent (DF P5) 0.

54 15 6 6.6 11 6.5 M3 22 7002 equivalent (DF P5) 0.

68 19 8 9 14 8.5 M4 24 7203 equivalent (DF P5) 1.

70 19 8 9 14 8.5 M4 30 7004 equivalent (DF P5) 1.

85 22 10 11 17.5 11 M5 35 7205 equivalent (DF P5) 2.

102 23 11 14 20 13 M6 40 7206 equivalent (DF P5) 3.

114 26 12 14 20 13 M8 50 7207 equivalent (DF P5) 4.

130 33 14 18 26 17.5 M8 50 7208 equivalent (DF P5) 6.

Part No. Part name No. of units

1 Housing 1 2 Bearing 1 set 3 Holding lid 1 4 Collar 2 5 Seal 2 6 Lock Nut 1

7 Hexagonal socket-head setscrew (with a set piece)

Ball Screw Peripherals

Support Unit

Mounting method B

φ d

L

H F

T 2 E

L 2

Unit: mm

Installation procedure A

Installation procedure B (^) Bearing used Mass

L 1 T 1 L 2 T 2 d 1 d 2 h M T kg

5.5 3 6.5 4 3.4 6.5 4 M2.6 10 AC4-12(DF P5) 0.

5.5 3.5 7 5 3.4 6.5 4 M2.6 11 AC5-14(DF P5) (^) 0.

5.5 3.5 8.5 6.5 3.4 6.5 4 M3 12 AC6-16(DF P5) 0.

7 4 10 7 3.4 6.5 4 M3 14 79M8A(DF P5) 0.

Part No. Part name No. of units

1 Housing 1 2 Bearing 1 set 3 Set nut 1 4 Collar 2 5 Seal 1 6 Lock Nut 1

7 Hexagonal socket-head setscrew (with a set piece)

FK Round Type Support Unit on the Fixed Side

Mounting method A

(90° equidistant)

Models FK 10 to 30

4-^ φ d 1 through hole, φ d 2 counter bore depth h

L

F H

L 1

φ Dg6^ φ d PCDφ A

E

R0.6MAX

T 1

B

T

M

Model No.

Shaft diameter

d L H F E D A PCD B

FK 10 10 27 10 17 29.5 34 –0. –0.

FK 12 12 27 10 17 29.5 36

–0. –0.

FK 15 15 32 15 17 36

–0. –0.

FK 20 20 52 22 30 50

–0. –0.

FK 25 25 57 27 30 60

–0. –0.

FK 30 30 62 30 32 61 75

–0. –0.

EF Square Type Support Unit on the Supported Side

2-φ d 1 through hole,^ φ d 2 counter bore depth h

Models EF 6 and 8

φ d

b P

B 1

h 1

HH 1

B

L

THK EF*

Model No.

Shaft diameter

d L B H b 0.

h 1 0.

B 1

EF 6 6 12 42 25 21 13 18

EF 8 6 14 52 32 26 17 25

EF 10 8 20 70 43 35 25 36

EF 12 10 20 70 43 35 25 36

EF 15 15 20 80 49 40 30 41

EF 20 20 26 95 58 47.5 30 56

Note) The area marked with “*” is imprinted with a numeric character(s) as part of the model number.

Ball Screw Peripherals

Support Unit

Part No. Part name No. of units

1 Housing 1 2 Bearing 1 3 Snap ring 1

2-^ φ d 1 through hole

Models EF 10 to 20

b P

h 1 H 1

H

B 1

B

L

φ d

THK EF*

Unit: mm

Bearing used

Snap ring size

Mass

H 1 P d 1 d 2 h kg

20 30 5.5 9.5 11 606ZZ C6 0.

26 38 6.6 11 12 606ZZ C6 0.

24 52 9 — — 608ZZ C8 0.

24 52 9 — — 6000ZZ C10 0.

25 60 9 — — 6002ZZ C15 0.

25 75 11 — — 6204ZZ C20 0.