Pumpexpertise

Variable mechanical water pumps

With its variable mechanical water pumps, Motorservice offers another innovative state of the art and up to the minute thermal management product in the aftermarket sector. Regulated and demand-based cooling saves fuel and thus reduces CO2 emissions. The options for regulating the volumetric flow include electromagnetic couplings, thermostat modules with thermostat valve, electronically actuated rotary slide valves with worm gear, covering the impeller with an electro hydraulic of pneumatic adjustable ring, and pneumatic bypass flaps inside the pump module. As a result, the pumps are in line with the current trend towards smart accessories in combustion engines.

 

Mechanical water pumps

The cooling liquid of the water pump absorbs the heat from the engine block and cylinder head and releases it into the ambient air through the cooler. Depending on their design, mechanical water pumps are located either externally on the engine in their own pump housing or are flanged directly on the crankcase and are driven by a V-belt, toothed belt or the engine directly.

Quality features of our water pumps:
 

• High-quality sliding ring sealing cartridge
• Maintenance-free, long-life rolling bearings
• Flow-optimised impellers made from plastic, steel, aluminium or brass
• Gaskets and O-rings are included in the scope of supply

Electrical water pumps

Electrical water pumps make a significant contribution to emission control on modern engine designs.

A delivery rate that is not dependent on the engine speed enables demand-based cooling. This reduces the power requirements whilst also cutting down on frictional loss, fuel consumption and pollutant emissions.

Pierburg has made this technology ready for series production and is the world’s first series-production supplier of electrical water pumps.

Water circulating pumps

Water circulating pumps are used where cooling or heating functions need to be performed independently of the coolant circuit. In independent heating systems, water circulating pumps are used for quickly heating the passenger compartment, for example.

The first generation alone was tried and tested millions of times over, proving itself to be a simple and robust coolant pump.

The second to fourth generations then underwent further optimisation in terms of dimensions, weight, control and hydraulic power.

Unregulated oil pumps

Oil pumps ensure that engine parts are supplied with a sufficient quantity of lubricating oil. For sufficient cooling and lubrication, the total oil volume must be pumped 4 to 6 times per minute through the engine. 

Moreover, the oil pump design must ensure that the lubricating points are supplied with fresh oil as fast as possible after cold starting, and the flow rate is always adequate even at low engine speeds.

Variable oil pumps

To reduce CO2 emissions, Pierburg has developed variable oil pumps. With oil-hydraulic tasks, which are in part new, such as hydraulic valve clearance and camshaft compensation, piston cooling and many more, modern engines in the lower engine speed range require disproportionately large oil volumetric flows. 

The delivery rate of the variable oil pumps can be adapted flexibly to the required oil volumetric flow, depending on the temperature, speed and load state of the engine. They help to deliver the oil when required, and thus save fuel.

Tandem pumps vacuum/oil

In tandem pumps, supply pumps for different media are combined on a common axle. While the single-vane vacuum pump generates the vacuum for the brake booster, the connected oil pump takes over either the function of the main oil pump or draws in excess oil from the cylinder head as an oil suction pump.

Mechanical vacuum pumps

Mechanical vacuum pumps can be driven by means of cams, tappets, chains, belts, or cam discs. Pumps that move a piston or diaphragm back and forth and generate a vacuum are well established in the field. 

A newer development is vane pumps with a rotary drive. Here, a rotor with one or more vanes forms compartments, the size of which varies during the work cycle.

Tandem pumps fuel/vacuum

In "tandem pumps", vacuum pumps are combined with other supply pumps on a common axle. In the fuel/vacuum combination, they fulfil the functions of mechanical vacuum pumps and are also used for fuel feed.

Tandem pumps, vacuum/oil

While the single-vane pump generates the vacuum for the brake booster, the connected G-rotor oil pump draws in excess oil from the cylinder head and conveys it back to the crankcase sump.

Electrical vacuum pumps

Electric vacuum pumps can be switched on independently of the vehicle engine, and on demand. This saves fuel and reduces emissions.

In hybrid vehicles, electric vacuum pumps maintain brake boosters when the combustion engine is switched off.