German SAUER BIBUS pump, SAUER BIBUS model, SAUER BIBUS price

SAUER BIBUS pump is a typical positive displacement hydraulic machine. Driven by a prime mover, it converts input mechanical energy into pressure energy of the liquid, which is then input into the system in the form of pressure and flow. It serves as the power source for hydraulic systems. Due to its ability to transport liquids under high pressure, it is widely used in various industries in industrial production and daily life, such as water conservancy, construction, and energy. It is also extensively applied in shipbuilding, oil extraction, and heavy-load machinery.

SAUER BIBUS pump structural forms

Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps. As radial piston pumps are a new type of high-efficiency pump with high technical content, they will inevitably become an important part of the piston pump application field with the acceleration of localization. A radial piston pump is a piston pump where the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: Drive torque is transmitted from the drive shaft via a cross coupling to the star-shaped hydraulic cylinder rotor; the stator is not subjected to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged pistons located in the rotor press tightly against the eccentric stroke stator through hydrostatically balanced slippers. The piston is connected to the slipper via a ball joint and locked with a retaining ring. Two retaining rings hold the slippers against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. As the rotor turns, due to the eccentricity of the stator, the piston performs reciprocating motion, with its stroke being 2 times the stator eccentricity. The stator's eccentricity can be adjusted by two pistons positioned radially opposite each other on the pump body. Oil inlet and outlet occur through channels in the pump body and distribution shaft, controlled by the suction port on the distribution shaft. The hydraulic pressure generated within the pump body is absorbed by the hydrostatically balanced surface. The hydrostatic balance of the friction pair adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft only provide support and are not subject to other external forces. In hydraulic systems: Axial piston pumps operate by utilizing volume changes produced by the reciprocating motion of pistons parallel to the transmission shaft within piston bores. Since the pistons and piston bores of piston pumps are circular parts, very high precision fits can be achieved during machining.

SAUER BIBUS pump mechanical principles

The total reciprocating stroke L of the piston pump plunger is constant, determined by the cam lift. The fuel supply volume per cycle depends on the fuel supply stroke; the fuel supply stroke is variable and not controlled by the camshaft. The start moment of fuel supply does not change with variations in the fuel supply stroke. Rotating the plunger can change the end moment of fuel supply, thereby altering the fuel supply volume. When the piston pump operates, the cam on the fuel injection pump camshaft and the plunger spring force the plunger to perform up-and-down reciprocating motion, thus completing the pumping task. The pumping process can be divided into the following two stages. 1) Oil intake process: After the raised part of the cam passes, under the action of spring force, the plunger moves downward, creating a vacuum in the space above the plunger (called the pump chamber). When the upper end face of the plunger opens the inlet hole on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the oil pump enters the pump chamber through the oil hole. The plunger moves to the bottom dead center, ending the oil intake. 2) Oil return process: The plunger supplies oil upward. When it moves up to the point where the helical groove (cut-off edge) on the plunger aligns with the return oil hole on the sleeve, the low-pressure oil circuit in the pump chamber communicates with the central hole, radial hole, and helical groove at the plunger head. Oil pressure drops sharply, and the delivery valve closes rapidly under spring force, stopping oil supply. The plunger continues to move upward. After the raised part of the cam passes, the plunger moves downward again under the action of the spring. This begins the next cycle. Using one plunger as an example for principle explanation: a single-plunger pump has two check valves with opposite directions. When the plunger moves in one direction, negative pressure appears in the cylinder, opening one check valve and sucking liquid into the cylinder. When the plunger moves in the other direction, it compresses the liquid, opening the other check valve and discharging the liquid sucked into the cylinder. This working mode forms continuous oil supply after continuous motion.

SAUER BIBUS pump mechanical maintenance

For piston pumps using a charge pump for oil supply, after 3000h of use, operators must inspect the piston pump 1-2 times daily to check if the hydraulic pump operating sound is normal. If a decrease in hydraulic cylinder speed or stalling is observed, the charge pump should be disassembled for inspection to check for scoring on the impeller edges and whether the internal gear pump clearance is excessive. For self-priming piston pumps, the oil level in the hydraulic tank must not fall below the lower limit of the oil gauge; sufficient hydraulic oil must be maintained. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump. The most important component of a piston pump is the bearing. If bearing clearance occurs, the normal clearance of the three pairs of friction pairs inside the hydraulic pump cannot be guaranteed, and the thickness of the static hydraulic support oil film of each friction pair will be damaged, reducing the service life of the piston pump bearing. According to data provided by hydraulic pump manufacturers, the average service life of bearings is 10000h; exceeding this value requires replacement with new ones. Removed bearings cannot have their clearance detected without professional testing instruments; only visual inspection is possible. If scratches or discoloration are found on the roller surface, they must be replaced. When replacing bearings, note the English letters and model number of the original bearing. Piston pump bearings mostly use high-load capacity bearings. Purchase products from the original manufacturer with original specifications. If switching to another brand, consult personnel experienced with bearings to check tables for equivalents, aiming to maintain the bearing's precision grade and load capacity. The service life of a piston pump is related to routine maintenance, the quantity and quality of hydraulic oil, and oil cleanliness. Avoiding wear on the piston pump friction pairs caused by particles in the oil is also an effective way to extend piston pump life. During maintenance, try to use original manufacturer-produced parts when replacing components. These parts may sometimes be more expensive than other counterfeit parts, but their quality and stability are better. Purchasing cheap counterfeit parts may seem to save costs in the short term, but it brings hidden dangers and may cause greater harm to the use of the piston pump. Distribution plates come in two forms: flat distribution and spherical distribution. For spherical distribution friction pairs, if scratches on the cylinder block distribution surface are relatively shallow, they can be repaired by grinding; if grooves on the cylinder block distribution surface are deeper, surface engineering techniques should first be used to fill the grooves before grinding. Blind grinding should be avoided to prevent thinning of the copper layer or exposing the steel base, which could lead to oil leakage. Piston pumps can also use frequency converters to save electrical energy. Engineers from Shanghai Zhengyi point out that in actual production processes, piston pumps usually regulate their operating status by pressure or flow. When actual pressure exceeds required pressure, relief valves are used for regulation to keep working pressure stable while the relief valve releases the excess. The motor always runs at full speed with repeated actions, and power consumption remains unchanged. When using overflow to regulate pressure and flow, some surplus flows back to the original system, resulting in useless power in the piston pump and low work efficiency. If a Chuangjie energy-saving frequency converter is used, the relief valve can be set to close, and the energy-saving frequency converter automatically adjusts the working pressure, maintaining stable working pressure and automatically tracking equipment pressure. This achieves automated control, thereby saving energy consumption. The greatest advantage of this regulation method is the reduction of operating energy consumption of the piston pump, with power saving effects reaching over 30%.

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