Tag Archives: NTN

NTN Develops High Load Capacity Cylindrical Roller Bearings with Rolling Element Separator

Powertransmissions - NTN Develops High Load Capacity Cylindrical Roller Bearings with Rolling Element Separator

[World's highest level of load capacity and high-speed rotating performance, as well as longer operating life!]

 

NTN Corporation (hereafter, NTN) has developed the High Load Capacity Cylindrical Roller Bearings that takes both load capacity and high-speed rotating performance to new levels.

Cylindrical roller bearings have a greater load capacity than ball bearings, and are primarily used in industrial gearboxes and reducers that are subjected to relatively high loads. Even cylindrical roller bearings feature “full complement roller bearings” without retainers for load capacities that are particularly high. Full complement roller bearings can use a larger number of rollers compared to ordinary bearings with a retainer, which extends the rated life. Yet the lack of a retainer can result in adjacent rolling elements coming into contact with one another when rotating at high speeds, causing scoring*1, smearing*2 and other damage, which limits applications mainly to low speed operation

With larger devices being manufactured to increase efficiency of wind turbine gearboxes or reducers used in hydraulic construction excavators and mining dump trucks, there is an increasing need for higher load capacity, as well as high-speed rotating performance to deliver higher output and efficiency.

The newly developed “High Load Capacity Cylindrical Roller Bearings” uses the “rolling element separator” developed by NTN to prevent contact between rolling elements, which allows almost the same number of rolling elements as full complement roller bearings to be integrated without any loss in rolling performance, and thus achieving the world's highest level of load capacity. Featuring 1.5-times longer rated life than cylindrical roller bearings with ordinary retainers, the new bearing can be used as low-speed shafts in gearboxes and reducers, as well as applied to medium and high-speed shafts. The optimal design can be applied to rolling elements of planetary gear type gearboxes and reducers often used in wind turbines or construction machinery, which means the inside bore surface of the planetary gear can be used as the outer ring track surface (photo: N type), contributing to lighter and more compact devices.

NTN has already started proposing the product to manufacturers of wind turbines and construction machinery, and plans to continue proposing it for industrial machinery applications centered on gearboxes and reducers.

*1 Scoring : wear caused by burnt out components. Often occurs when rolling elements slide in opposite directions, or there is insufficient lubricant used.
*2 Smearing : one type of surface damage that occurs on rolling surfaces, and is a group of small burnt sections.

 

[ Features ]

(1) Use of a proprietary rolling element separator to achieve high load capacity and high-speed rolling performance
- Almost the same quantity of rolling elements as full complement roller bearings can be integrated
1.5-times rated life (compared to cylindrical roller bearings with retainers)
- Prevents contact between rolling elements that occurs in full complement roller bearings
1.5-times high-speed rolling performance (compared to full complement roller bearings)
(2) Contributes to lighter, more compact devices
- Optimal design of rolling elements mean internal gear surfaces and rolling shafts can be used as outer ring track surfaces

 

[ Inquiries about this release ]

 

[ Product photo ]

Product photo
N type NU type
High Load Capacity Cylindrical Roller Bearings

 

[ Example of application ]

Example of application
Example configuration of planetary gear
using internal gear surfaces as outer ring
track surfaces
Wind turbine gearbox layout

NTN – EV Demonstration Project of Microcompact EV Equipped with the In-wheel Motor in France

Powertransmissions - NTN EV Demonstration Project of Microcompact EV Equipped with the In-wheel Motor in France

NTN Corporation (hereafter, NTN) has started a demonstration project of the microcompact EV equipped with NTN's own “In-wheel Motor System” on public roads in collaboration with Annecy City in France.

NTN had been using a compact EV in Annecy City for transportation within NTN-SNR business sites and between plants, as well as for customer test drives. The newly developed microcompact EV “TOO'in”*1 was delivered to Annecy City for use as an official vehicle, and will take part in a public road social demonstration project on a larger scale for one year.

The “TOO'in” microcompact EV used for the social demonstration project is a two-seater vehicle equipped with the “In-wheel Motor System for Compact EVs” developed by NTN, which has a maximum speed of 75 km/h. The body was produced by vehicle manufacturer Lazareth (based in Annecy), and has already been registered as an “L7e”*2 category vehicle, the official standard for electric microcars in Europe. This is the first demonstration test in the world of a microcompact EV equipped with the in-wheel motor as a registered vehicle conducted on public roads.

The “TOO'in” microcompact EV was unveiled at the opening event of the “Annecy International Animated Film Festival” held on June 10, and was used for transportation and deliveries between various venues during the event. As the official Annecy city vehicle, the “TOO'in” will be used for transportation between related facilities as well as for deliveries.

NTN has utilized the technology it has gained through research and development into bearings, as well as maximized the strength of the world's No. 1 share in hub bearings to advance development of the In-wheel Motor System and other system products for next-generation vehicles such as EVs and environmentally friendly vehicles. In Japan, NTN led a social demonstration test of a converted EV in Iwata City, Shizuoka Prefecture, and is also planning a demonstration project for electric commuters for the “Ultra-compact Mobility Certification System” that was established by the Ministry of Land, Infrastructure, Transport and Tourism this year.

Conducting a demonstration project in Europe, where development and business plans for next-generation vehicles are more advanced, will help accelerate development of cutting-edge technology designed for the commercialization of EV system products, while also increasing the number of activities designed to popularize the microcompact mobility more quickly.

*1 : TwO in-wheel mOtor inside, referring to the two In-wheel Motor systems installed. Too includes the meaning of Town, while in includes the meaning of Innovation.
*2 : The standard for electric microcars in Europe, with features including a maximum power output of 15 kW (approximately 20ps)

 

Annecy Mayor Rigaut on a test drive
The “TOO'in” unveiled at the “Annecy International Animated Film Festival.” Mayor Rigaut (2nd from left) at the unveiling ceremony held at the city hall
Annecy Mayor Rigaut on a test drive

The “TOO'in” unveiled at the “Annecy International

Animated Film Festival.” Mayor Rigaut (2nd from left)

at the unveiling ceremony held at the city hall

 

[ Reference: the In-wheel Motor ]

The In-wheel Motor system features a motor mounted directly within the wheel, which drastically allows more effective use of interior space and greater design flexibility. The “In-wheel Motor System for Compact EVs” developed by NTN is an EV system product that has been reduced to such a size and weight that the hub bearing, reducer and motor that make up the in-wheel motor have been mounted within the wheel, and includes a control system consisting of an inverter.

Compact EVs equipped with the in-wheel motor system are expected to play a major role in local communities as a simple model of transport as they are ideal for driving short distances, including shopping, commuting or driving to tourist spots, and are easy to get in and out of, which means that are suited to users of advanced age.

[ Reference: the In-wheel Motor System and the Demonstration Project Vehicle ]

Features of the In-wheel Motor System for Compact EVs
-Effective use of free space and greater design flexibility-

(1) Compact in-wheel motor module
A thin hub bearing has been used, allowing it to be mounted within the wheel.
(2) Drivetrain integrated into a systemized unit
Drive motor, reducer, hub bearing, and control system (including inverter)
(3) Independent control of drive power to left and right wheels
In-wheel Motor System for Compact EVs
In-wheel Motor System for Compact EVs
The microcompact EV “TOO'in”

 

TOO'in The microcompact EV “TOO'in”
The microcompact EV “TOO'in”
Length 2.85m
Width 1.425m
Weight 398kg(excluding battery)
Maximum speed 75km/h
Maximum power output 4kW×2
Drive system Two rear wheel drive(In-wheel Motor)

Source: NTN

 

NTN – Development of – Enhanced Anti-indentation Deep Groove Ball Bearing

Powertransmissions - NTN - Development of Enhanced Anti-indentation Deep Groove Ball Bearing

[Replacement for tapered roller bearings and lower fuel consumption by improving static load capacity of ball bearings!]

 

NTN Corporation (hereafter, NTN) has developed the “Enhanced Anti-indentation Deep Groove Ball Bearing” with a higher static strength across the bearing raceway surface that can be used in automotive differentials*1 (hereafter, diffs) and transmissions.

Further lower level of torque and higher efficiency are required of bearings as there is a greater need for fuel efficiency in automobile and reduction of CO2 emissions. Bearings used in drivetrain components such as diffs and transmissions are subjected to large thrust loads. Accordingly tapered roller bearings are widely used in these applications, however tapered roller bearings suffer from issues such as a relatively high rotational torque and the need to adjust preload during assembly. In contrast, ball bearings have a low torque and are capable of supporting thrust, however there were no ball bearings available to meet the thrust load capacities required for such applications.

The newly developed “Enhanced Anti-indentation Deep Groove Ball Bearing” features special surface modification during the heat treatment process, which has reduced the Brinell Indentation*2 depth - an index for static load capacity - to 1/2 compared to that of standard heat treatment. This allows tapered roller bearings used in diffs and other applications to be replaced with ball bearings, with an approximately 60%*3 reduction in torque expected in diff side bearings. The number of man-hours required for assembly and preload control process can also be reduced, contributing to improvement in productivity at automotive manufacturers, in addition to fuel efficiency in automobile.

*1: A drivetrain component used in vehicles with wheels such as automobiles. A differential compensates for the difference in wheel speeds (difference in speed between the inside and outside wheel) when an automobile turns a corner, and ensures that torque is distributed evenly from the power unit.
*2: Plastic deformation indentation left in objects after removing forces that exceed the plastic limit of the material when two objects are in Hertzian contact
*3: Compared with tapered roller bearings used in diffs for 2-liter class models, with 70% engine torque load and driving at 100 km/h

 

[ Features ]

(1) Static load capacity : 1/2 the Brinell Indentation depth compared to standard heat treatment
(2) Bearing torque : 60% reduction compared to tapered rolling bearings
(3) Reduced assembly man-hours : preload adjustments not required during transmission assembly

 

 

[ Applicable areas ]

Example of differential Example of CVT
Example of differential

http://www.ntn.co.jp/english/news/news_files/new_products/image/news201300052_3.jpg

 

 

 

 

 

 

 

 

 

 

 

Source: NTN


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