Bearings for Alternators & Starter Motors

An alternator is a rotating machine supplying power for a vehicle's electric system and charging the battery. The increasing demand for electrical power in cars and the quest for weight reduction is driving the development of high power alternators: more compact alternators, more current producing. This development trend is pushing up alternator speed and operating temperature. Both factors are significant in the selection of a suitable bearing solution. Alternators work in a difficult environment. Engine assembly packaging has often exacerbated this condition by placing alternators in locations where they are more exposed to road-spray or close to the high temperature of the engine's exhaust system. With the requirement for operation in cold-climate starting and hot-climate motorway conditions, alternators must span a very wide operating temperature range, typically from 40 °C to highs approaching 200 °C. High speed alternators run at three to four times engine speed, so the alternator will be subjected to speeds, albeit for limited periods, in excess of 20,000 rev/min.

Bearings for Engine system

Today’s petrol (gasoline) and diesel engines are highly sophisticated and computer regulated devices. The substantial gains seen in recent years in economy and emission levels have been, in the main, due to the very complex and detailed control provided by modern ECU engine management systems. For most of cars, gasoline engines are applied. However, for many heavy vehicles, diesel engines are widely applied.

Bearings for Driveline

A car’s driveline is normally considered to include everything from the clutch through to the driven wheels.

Bearings for Steering System

Vehicles have three basic functions: moving, turning and stopping. Turning is the job of the steering system. Steering systems are mechanisms by which turning displacement of the steering wheel is converted to turning of the tires via the steering gear. Various types of rolling bearings are used in the various rotational mechanisms of steering system. The main steering system from the steering wheel to the tires consists of the following components: >Steering column >Steering gear >Hydraulic pump

Bearings for Metro-electricity

Integrating mechanical systems with electric power lead to more efficient, reliable and safer products. These applications are used everywhere in vehicles such as air conditioning, engine radiator, automatic window lifter, wipers and various sliders. Serving OEM customers of these applications for many years,

Bearings for Chassis

To be cost-effective, these applications need to be compact and require a minimum of maintenance, but there is also an urgent need for these to contribute to increased safety for operators. To meet these demands, ZZ offers a wide range of high reliable bearings. For improved cost-effectiveness, the ZZ bearings are maintenance-free and facilitate downsizing.

Bearings for Bulk Conveyors

All equipments in the material transferring are working under massive stress. The heavy loads and harsh working environments constantly put machinery into the dirt and other contaminants. Because bulk handling conveyors are considered as slow moving applications, bearing speed and temperatures are typically not a factor. However, heavy loads, shock loads and contamination can significantly reduce bearing service life. The usual problems in bulk conveyors are as following: > Loose parts (loose toggle parts, loose screen mesh) > Unbalance > Lack of lubrication > Impacts

Bearings for Warehouse Conveyors

Warehouse conveyors are one of the most frequently used conveyor systems. They are used to transport parts in package form of boxes or pallets. They are most often indoors and are relatively slow speed moving, so speed and operating temperature are typically not factors in bearing selection. With the fast development in this industry, the fully automatic warehouse handling becomes realistic. However, costly shutdowns for maintenance are inevitable due to the wear of equipment components or contaminants get baked onto the bearings. This and other problems are constant challenges to this industry. As a long-time partner to conveyor producers all over the world, ZZ, with our competencies and abundant bearing application knowledge, offers a wide range of solutions, resulting in reduced costs for maintenance, and increased productivity.

Bearings for Unit Conveyors

Unit conveyors are conveyor systems, often modular, used to transport parts, boxes, and other individual pieces or assemblies around a warehouse, factory or other facilities. They are most often indoors and are relatively slow moving, so speed and operating temperatures are typically not factors in bearing selection. Total rolling resistance (friction), bearing noise, maintenance requirements and personnel safety are more often the features considered when choosing bearings for unit conveyors. Unit conveyors are also getting progressively more “high tech” with needs for precision speed control and placement of the items being conveyed and integration of weighing and tracking systems into the equipment. In assembly system, unit conveyor makes production more efficient, rapid and safer. All conveyors in the range are modular in design which together with the extensive choice of ancillary conveyor equipment enables the user to create a tailor made conveyor system to suit their own specific requirements. ZZ continuously provides unique bearing application knowledge. For unit conveyors, this results in a wide range of safe and reliable solutions, all aiming to reduce overall costs and meet new environmental demands.

Bearings for Lifts

It should be noted that grease must be added to the bearing during use, so that the bearing can function better. However, adding too much grease will also increase the running resistance, which has some influence on the speed.

Bearings for Blush Motors

The magnetic field comes from either wound coils or a permanent magnet. This type of motor has a mechanical switch or commutator, which reverses the current in the armature of the machine. The "speed per torque" characteristic is constant and the slope of the speed/torque curve depends on the strength of the magnetic field.

Bearings for AC Single-phase Induction Motors

Induction motors are the most used driving system, from fractional horsepower to hundreds of horsepower, where speed rotation does not require varying. Single-phase induction motors are largely used in low power applications. Split phase, capacitor start and permanent split capacitor motors are commonly used to drive washing machine drums. Shaded pole and permanent split capacitor motors are used to drive dishwasher water pumps. Thus bearing design strongly depends upon the final application of the motor. The types of fractional horsepower motors are designed to match the requirements of each application.

Bearings for Advanced Motors

The main advantage with this type of machine is the absence of brushes. This means that they can give good performance in service life with low noise and low contamination (from brush dust).

Bearings for Industrial Electric Motors & Generators

ZZ has a long and vast experience in the electric motor industry as well as in most of the industries where electric motors and generators are used. In this highly competitive industry, the profound knowledge of ZZ has been used to develop solutions to meet the ever increasing demands for higher quality, shorter delivery time, lower noise levels and improved technical support. Motors for specific applications are high volume products, which are typically small to medium sized, ranging from 1 to 500 KW. These motors are used within specific applications e.g. fans, pumps and compressors where the reliability and trouble-free operation of the motor are of high importance. Also generators have to cope with the same or even tougher needs. The three-phase induction motor is a robust and maintenancefree solution that is the most commonly used type in industrial applications. For application specific motors, it is very important to select the right bearings and bearing arrangements to optimize performance for the specific application operating conditions. ZZ’s expertise in this field could add further benefits with significant improvement in motor reliability and performance, thus improving machine profitability.

Bearings for Electric Lawn Mowers & Garden Tools

Corded and cordless versions are available. The market demand for cordless machines is increasing. The modern cordless machine combines the low noise and low maintenance of corded versions with the movement flexibility of petrol equivalents. The typical design of an electric lawn mower has an armature shaft (vertical axis electric motor) on which the cutting blade is mounted through a safety clutch device.

Bearings for DIY Power Tools

The "Do It Yourself" market asks for reliability, economy and easy handling (low weight). The market for cordless products continues to grow with users looking for tools that can offer low weight for ease of handling and high power output combined with low power loss to optimize performance.The environment for DIY power tools is highly contaminated with dust etc. Hence, it is necessary to ensure good contamination protection.

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