Support Bearing Unit for Precision Ball Screws BSU1747BDF
Model BSU1747BDF / BSU0000BDF系列 / JTEKT Corporation (Official website) / Listed on page 145 of the document
Bearing unit for precision ball screw support incorporating SAC1747BDF. Housing outer diameter 60 mm, excellent dust resistance.
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Specifications
| Shaft diameter d | 17 mm |
|---|---|
| Outer diameter D | 60 mm |
| Overall length L | 65 mm |
| Number of rows in combination | 2 列 |
| Standard Preload | 2.15 kN |
| Starting torque | 140 mN·m |
| Mass | 1.72 kg |
How to choose Bearing units
Points to check when selecting, with the values for this product (BSU1747BDF).
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1. Match shaft diameter and dimensional system (metric/inch)
This product: Shaft diameter d 17 mmBearing units are offered in separate metric and inch series, and they are not interchangeable even when their appearance is similar. Listed products cover metric sizes of 3 to 150 mm and inch sizes of 1 to 4 in. First determine the shaft diameter and dimensional system, then select from the corresponding series.
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2. Check the rated load against the operating conditions
The basic dynamic load rating Cr is used for rolling fatigue life calculations, and the basic static load rating C0r is used for evaluating stationary or shock loads. Listed Cr values range from 7.28 to 793 kN, and there are heavy-load products, such as half-ring types, with increased static load ratings.
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3. Select a specification suited to the operating temperature
Standard greases and rubber seals deteriorate at high temperatures. High-temperature specifications are available in types with different upper temperature limits; for example, VA201 is rated at 130 to 250°C and VA228 at 260 to 350°C. In addition to the ambient temperature, check the permissible seal temperature and the sealed grease.
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4. Choose the shaft fixing method for the application
Set-screw type is easy to install but requires control of the tightening torque. The method that fixes the bearing with a tapered bore and adapter sleeve provides a secure connection to the shaft and suits applications with reversing rotation or vibration. Check it together with the recommended shaft tolerance grade.
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5. Verify the permissible rotational speed
Bearing units have an upper limit on usable rotational speed depending on seal friction and the fixing method. The permissible speeds of listed products range widely from 6 to 12000 r/min, and low-speed heavy-load and high-speed units have very different characteristics. Confirm that the operating speed has sufficient margin.
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6. Allow for shaft tilt during installation
In the spherical-fit design, the unit can absorb shaft tilt during installation up to a certain angle. However, in structures that allow regreasing, the permissible angle may be smaller. Listed products include an example of 2°. Check the permissible misalignment according to the accuracy of the base or frame.
This guide was written by AI based on the listed products' documents and specification items.
Description
A unit product in which a support bearing, preloaded and pre-packed with grease, is incorporated into a high-precision housing. Easy to install and offers excellent dust resistance.
Features
- Simple installation
- Preloaded at factory, no complex adjustment required
- High-performance oil seal provides excellent dust resistance
Applications
- Machine tools
- Precision ball screw support
FAQ
- Q. Can the BSU1747BDF be used for ball screw support in machine tools? Please tell me its applications and features.
- A. Applications are machine tools and precision ball screw support. It is a unit product in which a support bearing, preloaded and pre-packed with grease, is incorporated into a high-precision housing.
- Q. How about the installation and dust resistance of the BSU1747BDF?
- A. Installation is simple, and as it is preloaded, no complex adjustment is required. The high-performance oil seal provides excellent dust resistance.
- Q. Please tell me the dimensions, preload, and starting torque of the BSU1747BDF.
- A. Shaft diameter d is 17 mm, outer diameter D is 60 mm, and overall length L is 65 mm. The number of rows in the combination is 2, the standard preload is 2.15 kN, and the starting torque is 140 mN·m.
- Q. What is the mass of the BSU1747BDF, and which bearing is incorporated in it?
- A. The mass is 1.72 kg. It is a bearing unit for precision ball screw support incorporating the SAC1747BDF.
Written by AI based on the content of the source documents.
Source documents
Similar products from other manufacturers (alternatives)
Products from other manufacturers that match BSU1747BDF on two or more numeric specifications such as dimensions or ratings. Type and compatibility are not guaranteed; check each manufacturer's documents before adopting.
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