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Clutches

Boya Singapore is a leading worldwide supplier of medium and heavy-duty clutches to the commercial vehicle industry. Our clutches are unmatched in terms of reliability, durability and performance. We are preferred by most original equipment manufacturers and are unquestionably the best value on the market today. Our engineers employ rigorous component and vehicle testing to ensure absolute performance excellence. And our state of the art precision manufacturing technology enables us to provide consistent high quality, clutch after clutch. Only Boya Singapore offer a complete range of clutches to meet your performance and value needs. Whether it is an original equipment clutch in a new truck or a genuine Eaton aftermarket clutch, each is backed by Roadranger support.

Drawn cup roller clutches are designed to transmit torque between the shaft and housing in one direction and allow free overrun in the opposite direction. These designs utilize the same small radial section as drawn cup needle roller bearings. The units are compact, lightweight and operate directly on a hardened shaft. Proper mounting is easily accomplished with a simple press fit in the housing. Clutches and clutch and bearing assemblies are offered both in inch and metric nominal series.

 

Size range: 4mm - 30mm (1/8 in. - 1 in.) bore
 

Design Attributes

  • When transmitting torque, either the shaft or the housing can be the input member.
  • Rollers wedge against precisely formed interior ramps to positively transmit torque.
  • Transition from overrun to lock normally occurs with the minimal lost motion (backlash)
  • Drawn cup roller clutches are offered as clutch-only unit or as a clutch and bearing assembly.
  • Clutch-only units should be used with external radial support to hold the shaft and housing concentrically and carry radial loads.

 

Applications

  • Paper moving (copiers, fax machines, paper towel dispensers, etc.)
  • Exercise equipment
  • Appliances
  • Two-speed gearboxes
  • Rack indexing drives



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Constant Velocity Joints

Constant Velocity Joints

NTN started production of constant velocity joints (CVJs) in Japan in 1963. In 2007, the number of CVJs produced on a cumulative basis surpassed 400 million units. Following aggressive expansion of production worldwide in the 1990s, we now have a strong base of operations to respond to the global sourcing needs of the automotive industry. These operations are supported by a trilateral development system covering the three key regions of the Americas, Japan and Europe. A production and sales system encompassing these three regions has expanded to include China and other parts of Asia.
WE MANUFACTURE WHERE WE SELL

Since 1991, NTN has been producing American-made CVJs at our state-of-the-art manufacturing facility in Columbus, Indiana. This plant has been recognized for environmental stewardship by the government of Indiana and is a zero-landfill operation. We’ve continued to expand our global presence with more than 18 CVJ plants around the world.
TECHNOLOGY FOR ECOLOGY

When it comes to manufacturing CVJs for automotive use, performance demands are depend on the type of joint and the location in which they will be used. So, at NTN, we develop special, environmentally conscious, lead-free grease for each type of CVJ and each differing application, so that each one of our joints can operate at its highest level.

Furthermore, as a pioneer in constant velocity joints, we’ve held ourselves to high environmental standards. NTN has answered the demand for lighter, more compact, and higher performance products to reduce fuel consumption. We’ve also provided environmentally considerate products that strictly adhere to both domestic and international environmental standards.



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Deep groove ball bearings

The most typical type of bearing, these are used in a wide range of fields. They include grease-enclosed sealed and shield bearings for ease of use. Other types include bearings with a locating snap-ring to facilitate positioning when mounting the outer ring, expansion compensating bearings that absorb variations in bearing fitting surface dimensions due to housing temperature, and TAB bearings that are resistant to contamination in lubricating oil.
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Double-row angular contact ball bearings

These have a structure that arranges single row angular contact ball bearings as back-to-back duplex (DB) bearings, uniting both the inner ring and outer ring. They are able to bear radial loads and bi-directional axial loads, with ability to bear moment loads as well. Both seal-type and shield-type bearings are available, with rated loads differing from open types.
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Long-Life AS Series TAB/ETA bearings

Because most bearing damage occurs on the raceway surface, NTN has enhanced the surface layer structure through a special heat treatment and selection of materials that have a persevering structure that does not give up surface hardness. Also, NTN has optimized the crowning of the tapered roller elements.These measures inhibit formation of hairline cracks that serve as the starting point for peeling and various other types of damage, and provide merits such as long life.
2.1 Crack Resistance and Stress Relaxing Effect Softer than martensite parent phase, retained austenite relaxes the stress concentration in the impression area caused by contaminated lubrication material inhibiting formation of cracks. As shown in Fig. 1, residual stress shifts toward the pulling side for extreme surface layers of the impression portion in all cases, and through-hardened steel having undergone standard heat treatment produces residual tensile stress. If you compare items having special heat treatment and those having standard heat treatment, there is less harmful shift of stress to the pulling side for those having undergone special heat treatment. Special heat treatment is recognized as having a stress relaxing effect.
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Needle roller and cage assemblies for connecting rod bearings

F needle roller and cage assemblies are ready-­to­-mount, self­-contained bearings. They are an excellent choice for applications that require a very rigid bearing arrangement as well as a high load carrying capacity. If the shaft and housing bore can serve as raceways, needle roller and cage assemblies require minimal radial space.

Basic design bearings

SKF basic design needle roller and cage assemblies are identified by the series designation K and available in single row (fig. 1, no designation suffix) and double row (fig. 2, designation suffix ZW) designs. They are characterized by the following properties:
  • simple and rugged design
  • accurate roller guidance in the cage pockets
  • good running performance
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Bearings with an oil-impregnated porous sintered body mainly composed of metal powder. Oil is impregnated into the pores of the bearing itself, resulting in efficient lubrication inside the bearing during operation.
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Bearings made of resin material for slippery surfaces or axes. Can be adopted for a wide range of fields and machine components due to light weight, lower cost, and versatility compared to metal. Generate less vibration and noise and have a lower slip friction coefficient due to light weight. Excellent plastic workability and electrical insulation when heated, water-resistant.
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Tapered roller bearings

Tapered roller bearings are designed so the inner and outer ring raceway and the apex of the tapered rollers intersect at one point on the bearing centerline. For this reason, the rollers are pushed against the inner ring rib and roll guided by the rib, receiving the loads from the inner ring raceway surface and the outer ring raceway surface as a combined load on the raceway surface. Component force is produced in the axial direction when a radial load is applied, so the bearings must be used in pairs. The inner ring with rollers and outer ring separate, facilitating mounting with clearance or preload. However, assembled clearance is hard to manage and calls for attention. Tapered roller bearings are capable of supporting large loads, both axial and radial.
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