VSA25/VSI25/VSU25 Series Four Point Contact Ball Slewing Bearings

Four Point Contact Ball Slewing Bearing(VSA25/VSI25/VSU25 Series) (VSA 25)

INA Four Point Contact Bearings Series VSA 25（External Gear Teeth Type）

LYNBC four point contact bearings series VSA25 are units comprising inner and inner rings with a closing plug and securing dowel, rolling elements, spacers, contact seals and lubrication nipples,with gear teeth on the outer ring. It has bearing inner rings with through holes and bearing outer rings threaded holes for fixing screws. Four point contact bearings can support axial, radial and tilting moment loads, but cannot be subjected to load as high as crossed roller bearings.

▲The design’s of all these four point contact bearings series VSA 25 are based on standard structures; LYNBC can design and manufacture many other similar structures in accordance to the special and particular requirements of their customers’. If our customer’s have specific requests then the customer should identify the structure, and mounting dimensions that are required. Please contact the LYNBC technical center if you need any assistance in this area.

Designation	No. ¹⁾	Dimension						Fixing holes			Gear Data			Tooth force		Basic load ratings				Mass (kg)
		D_a	D_i_ZT²⁾	d_i	D_i	d_a	d_i_ZT²⁾	L_a	L_i	n_B³⁾	do	m	z	F_{z norm} (kN)	F_{z max} (kN)	axial		radial
		D_a	D_i_ZT²⁾	d_i	D_i	d_a	d_i_ZT²⁾	L_a	L_i	n_B³⁾	do	m	z	F_{z norm} (kN)	F_{z max} (kN)	C_a (kN)	C_oa (kN)	C_r (kN)	C_0r (kN)
VSA 25 0755 N	①	898	755	655	753	757	657	816	695	24	882	9	98	55.1	80.2	460	2250	300	1010	128
VSA 25 0855 N	②	997	855	755	853	857	757	916	795	28	981	9	109	55.1	80.2	485	2550	315	1150	145
VSA 25 0955 N	③	1096	955	855	953	957	857	1016	895	30	1080	9	120	55.1	80.2	500	2850	330	1280	155
VSA 25 1055 N	④	1198	1055	955	1053	1057	957	1116	995	30	1180	10	118	61.2	89	520	3150	340	1410	171

Four Point Contact Ball Slewing Bearing(VSA25/VSI25/VSU25 Series) (VSI 25)

INA Four Point Contact Bearings Series VSI 25（Internal Gear Teeth Type）

LYNBC four point contact bearing series VSI 25 are units comprising inner and outer rings with a closing plug and securing dowel, rolling elements, spacers, contact seals and lubrication nipples, with gear teeth on the inner ring. It has bearing outer rings with through holes and bearing inner rings threaded holes for fixing screws. Four point contact bearings can support axial, radial and tilting moment loads, but cannot be subjected to load as high as crossed roller bearings.

▲The design’s of all these four point contact bearings series VSI 25 are based on standard structures; LYNBC can design and manufacture many other similar structures in accordance to the special and particular requirements of their customers’. If our customer’s have specific requests then the customer should identify the structure, and mounting dimensions that are required. Please contact the LYNBC technical center if you need any assistance in this area.

Designation	No. ¹⁾	Dimension						Fixing holes			Gear Data			Tooth force		Basic load ratings				Mass (kg)
		D_a	d_i²⁾	d_a_ZT	D_i²⁾	D_a_ZT	d_a	L_a	L_i	n_B³⁾	do	m	z	F_{z norm} (kN)	F_{z max} (kN)	axial		radial
		D_a	d_i²⁾	d_a_ZT	D_i²⁾	D_a_ZT	d_a	L_a	L_i	n_B³⁾	do	m	z	F_{z norm} (kN)	F_{z max} (kN)	C_a (kN)	C_oa (kN)	C_r (kN)	C_0r (kN)
VSI 25 0755 N	①	855	610	755	753	853	757	815	694	24	630	10	63	68	98.9	460	2250	300	1010	119
VSI 25 0855 N	②	955	710	855	853	953	857	915	794	28	730	10	73	68	98.9	485	2550	315	1150	137
VSI 25 0955 N	③	1055	810	955	953	1053	957	1015	894	30	830	10	83	68	98.9	500	2850	330	1280	149
VSI 25 1055 N	④	1155	910	1055	1053	1153	1057	1115	994	30	930	10	93	68	98.9	520	3150	340	1410	165

Four Point Contact Ball Slewing Bearing(VSA25/VSI25/VSU25 Series) (VSU 25)

INA Four Point Contact Bearings Series VSU 25（Without Gear Teeth Type）

LYNBC four point contact bearing series VSU 25 are units comprising inner and outer rings with a closing plug and securing dowel, rolling elements, spacers, contact seals and lubrication nipples. It has bearing outer rings and inner rings with through holes. Four point contact bearings can support axial, radial and tilting moment loads, but cannot be subjected to load as high as crossed roller bearings.

▲The design’s of all these four point contact bearings series VSU 25 are based on standard structures; LYNBC can design and manufacture many other similar structures in accordance to the special and particular requirements of their customers’. If our customer’s have specific requests then the customer should identify the structure, and mounting dimensions that are required. Please contact the LYNBC technical center if you need any assistance in this area.

Designation	No.¹⁾	Dimension						Fixing holes			Basic load ratings				Mass (kg)
		D_a	d_i²⁾	d_iZT	D_i²⁾	D_a_ZT	d_a	L_a	L_i	n_B³⁾	axial		radial
		D_a	d_i²⁾	d_iZT	D_i²⁾	D_a_ZT	d_a	L_a	L_i	n_B³⁾	C_a (kN)	C_oa (kN)	C_r (kN)	C_0r (kN)
VSU 25 0755	①	855	655	675	753	853	757	815	695	24	460	2250	300	1010	90
VSU 25 0855	②	955	755	757	853	953	857	915	795	28	485	2550	315	1150	101
VSU 25 0955	③	1055	855	857	953	1053	957	1015	895	30	500	2850	330	1280	115
VSU 25 1055	④	1155	955	957	1053	1153	1057	1115	995	30	520	3150	340	1410	128

VSA25/VSI25/VSU25 Series Four Point Contact Ball Slewing Bearings Introduction

Four point contact ball slewing bearing(VSA25/VSI25/VSU25 Series) are a versatile bearing solution when both radial and axial loads need to be supported in a compact design. Their ability to handle axial loads in both directions makes them a valuable choice for many applications. However, it's essential to carefully consider the application's specific requirements and select the appropriate bearing with proper mounting and lubrication to ensure optimal performance and longevity.

Key Characteristics and Features

Single-Row Design: Simpler construction compared to double-row bearings.

Four-Point Contact: Each ball makes contact at four points when subjected to combined radial and axial loads. This configuration allows for efficient handling of axial loads in either direction.

High Axial Load Capacity: Their primary strength lies in their ability to handle significant axial loads.

Moderate Radial Load Capacity: While designed for axial loads, they can also handle radial loads to a lesser extent.

Space-Saving: Single-row design contributes to a smaller footprint.

High Speed Capability: Suitable for high-speed applications.

Can Accommodate Misalignment: Tolerant of small amounts of misalignment between shaft and housing.

How They Work

The design of the inner and outer raceways is such that the contact angle is typically around 35 degrees. When combined radial and axial loads are applied, the balls make contact with both the inner and outer rings at four separate points.

Advantages

Excellent Axial Load Capacity: Handles axial loads in both directions, simplifying design and reducing the need for multiple bearings.

Space Efficiency: Single-row design saves space compared to using separate thrust and radial bearings.

High-Speed Operation: Suitable for high-speed applications.

Simplified Design: The ability to handle both radial and axial loads can simplify machine design.

Cost-Effective: Offers a balance of performance and cost.

Applications

Four point contact ball slewing bearing(VSA25/VSI25/VSU25 Series) are commonly used in applications where axial loads are significant, and space is limited. Some typical applications include:

Machine Tools: Spindle bearings in machine tools.

Pumps: Axial positioning of shafts in pumps.

Gearboxes: Supporting shafts and gears in gearboxes.

Robotics: Joints in robotic arms.

Textile Machinery: Various rotating components in textile machines.

Agricultural Machinery

Aerospace Applications

Medical Equipment

Factors to Consider When Selecting VSA25/VSI25/VSU25 Series Four Point Contact Ball Slewing Bearings

Load Requirements: Carefully analyze the radial and axial loads.

Speed: Determine the operating speed.

Operating Temperature: Consider the operating temperature range.

Lubrication: Choose appropriate lubrication based on speed, load, and temperature.

Misalignment: Evaluate potential misalignment and choose a bearing with suitable tolerance.

Mounting: Ensure proper mounting procedures are followed.

Required Precision and Rigidity

Important Considerations and Caveats

Preload: Applying the correct preload is essential for proper operation and to prevent ball skidding, especially under light loads.

Lubrication: Proper lubrication is crucial to prevent wear and extend bearing life.

Contamination: Protection from contaminants (dirt, moisture, etc.) is important.