PI 040-17 Lohr am Main, 2017-09-06

Pulsation halved – Noise reduced

More comfortable workspace thanks to less pulsation: Bosch Rexroth reduces the noise generated without additional encapsulation.

Improved performance and reduced noise level with pre-compression volume in Rexroth A10 medium pressure pumps

By integrating an additional compression volume, Bosch Rexroth has cut the pressure pulsation of mobile hydraulic systems in the Rexroth A10 medium pressure pumps. This technical solution reduces the noise emissions of agricultural and forestry machinery and improves the controllability of hydraulically operated vehicle functions.

With each new vehicle generation, the demands placed on the hydraulic power increase, often with the same system design. This can increase the pressure pulsation. It is one of the three physical sources of noise emission coming from hydraulic systems in agricultural and forestry machinery, alongside the airborne sound and mechanical vibration. The trend is toward lower total noise emissions, whereby hydraulic systems also need to do their part. That's why Bosch Rexroth makes an additional contribution in the form of a holistic approach for the pre-compression volume (PCV).

With the standard design of axial piston pumps, there is a substantial drop in flow when the piston transfers from high pressure area to low pressure area. With the solution developed by Bosch Rexroth, not only does the PCV maintain a volume, but the switching process has also been adapted. To do this, developers have optimized the entire structure of the axial piston unit, such as the rotary group, swivel angle and other elements. As a result, the flow is not so quickly and clearly interrupted. Bosch Rexroth has thereby cut the pressure pulsation in half over the entire pressure and speed range and reduced the overall sound level of the vehicle. The total noise emissions of machines outside and inside the driver's cab are reduced without the need for additional soundproofing hardware.

In addition, the solution reduces the total load of the hydraulic system with all its components. This leads to better control of the system and of the vehicle functions. Bosch Rexroth offers the PCV option for the medium pressure axial piston variable pumps A10V(S)O for open circuits. These pumps cover the pressure range up to 280 bar and have proven themselves in tens of thousands of agricultural and forestry machines to be extremely robust and durable.

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, and Factory Automation to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 29,500 associates generated sales revenue of approximately 5 billion euros in 2016.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 390,000 associates worldwide (as of December 31, 2016). The company generated sales of 73.1 billion euros in 2016. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. As a leading IoT company, Bosch offers innovative solutions for smart homes, smart cities, connected mobility, and connected manufacturing. It uses its expertise in sensor technology, software, and services, as well as its own IoT cloud, to offer its customers connected, cross-domain solutions from a single source. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.” The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers nearly every country in the world. The basis for the company’s future growth is its innovative strength. At 120 locations across the globe, Bosch employs some 59,000 associates in research and development.

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Manuela Kessler
Maria-Theresien-Straße 23
97816 Lohr am Main
Phone: +49 9352 18-4145

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