science

Radial piston pump

Radial piston pump is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Radial piston pump rather than just read about it. In short: A radial piston pump is a form of hydraulic pump. The working pistons extend in a radial direction symmetrically around the drive shaft, in contrast to the axial piston pump.

Key takeaways

Radial piston pump belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Radial piston pump to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Radial piston pump from memory before moving on to harder problems.

Reference excerpt

A radial piston pump is a form of hydraulic pump. The working pistons extend in a radial direction symmetrically around the drive shaft, in contrast to the axial piston pump.

Construction

The stroke of each piston is caused by an eccentric drive shaft or an external eccentric tappet (e.g., stroke ring). When filling the workspace of the pumping pistons from "inside" (e.g., over a hollow shaft) it is called an inside impinged (but outside braced) radial piston pump (picture 1). If the workspace is filled from "outside" it's called an outside impinged radial piston pump (but inside braced) (picture 2).

Function The general mode of operation will be explained at the movement of one pumping piston by means of picture 1: The outer ring for bracing of the pumping pistons is in eccentric position to the hollow shaft in the center. This eccentricity determines the stroke of the pumping piston. The piston starts in the inner dead center (IDC) with suction process. After a rotation angle of 180° it is finished and the workspace of the piston is filled with the moved medium. The piston is now in the outer dead center (ODC). From this point on the piston displaces the previously sucked medium in the pressure channel of the pump.

Attributes These kinds of piston pumps are characterized by the following advantages:

high efficiency high pressure (up to 1,000 bar or 14000psi) low flow and pressure ripple (due to the small dead volume in the workspace of the pumping piston) low noise level very high load at lowest speed due to the hydrostatically balanced parts possible no axial internal forces at the drive shaft bearing high reliability A disadvantage is the bigger radial dimensions in comparison to the axial piston pump, but it could be compensated with the shorter construction in axial direction.

Applications Due to the hydrostatically balanced parts it is possible to use the pump with various hydraulic fluids like mineral oil, biodegradable oil, HFA (oil in water), HFC (water-glycol), HFD (synthetic ester) or cutting emulsion. That implies the following main applications for a radial piston pump:

machine tools (e.g., displace of cutting emulsion, supply for hydraulic equipment like cylinders) high pressure units (HPU) (e.g., for overload protection of presses) test rigs automotive sector (e.g., automatic transmission, hydraulic suspension control in upper-class cars) plastic- and powder injection molding wind energy

See also Axial piston pump Hydraulics Pump

References

Illustrations

Worked examples

Example 1 — a first encounter with Radial piston pump

Start with the simplest possible case. Write down what Radial piston pump claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Radial piston pump before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Radial piston pump ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Radial piston pump

In research: Radial piston pump appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Radial piston pump in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Radial piston pump is common in secondary-school and first-year university syllabi. It links to neighbouring topics Pumps, so understanding it makes those chapters shorter.
In everyday life: Look for Radial piston pump outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Radial piston pump in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Radial piston pump means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Radial piston pump out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Radial piston pump in simple terms?

A radial piston pump is a form of hydraulic pump. The working pistons extend in a radial direction symmetrically around the drive shaft, in contrast to the axial piston pump.

Why does Radial piston pump matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Radial piston pump?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Radial piston pump.