One. Wrong installation method:
1. The coupling is too tight:
Because the coupling and shaft fit clearance is too small or no backlash, the bearing will be damaged when struck hard, resulting in early bearing damage and affecting the life of the entire pump core.
2. Axial force on the shaft head:
Since the coupling does not have a certain axial clearance during installation, the hard installation will damage the bearing and bearing retaining ring, and in severe cases, it will damage the entire pump core.
3. Concentricity out-of-tolerance:
If the coaxiality exceeds the specified value during installation, the bearing and the entire pump core will be eccentric and damaged early, and it is generally better to control it at about 0.1 mm ≤
Two. The system environment is harsh
1. The oil is too dirty:
Since the oil tank is not sealed, the surrounding dust and iron debris mixed into the oil can cause early damage to the oil pump.
2. The temperature is too high:
Since the cooling device is not installed, the oil temperature will continue to increase during the continuous use of the machine. If the oil temperature is higher than 70°C for a long time, the life of the oil pump will be greatly shortened, and it will generally be damaged in half a year to a year (sometimes shorter).
3. Water inlet in oil:
In the device with water cooling, due to the poor sealing of the water pipe, the water enters the oil, which causes the pump core parts to rust, lock, and the blades cannot be thrown out.
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More on that
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Rexroth hydraulic oil pump disassembly process
1. Loosen and remove the connecting screws on the pump cover and bearing end cover.
2. Remove the positioning pin, pump cover and bearing cover.
3. Take out the transmission shaft and shaft sleeve from the housing of the pump.
4. Take out the two gears from the casing of the pump.
5. Remove the floating side plate and sealing ring ...
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Features and working principle of Rexroth solenoid valves
First, the characteristics of the solenoid valve:
1) Rexroth solenoid valve, solenoid valve and all stainless steel; For highly corrosive media, the diaphragm type must be selected. Neutral medium, it is also advisable to choose copper alloy as the solenoid valve housing material, otherwise, there are often rust chips falling off in the valve housing, especially the action is infrequent ...
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Where does the daily maintenance of Rexroth hydraulic pump start?
1. Maintain a proper oil temperature
The working temperature of the hydraulic system is generally controlled between 30 and 80 °C (dangerous temperature ≥ 100 °C). Too high oil temperature in the hydraulic system will lead to: the viscosity of the oil will decrease, which will easily cause leakage and reduce efficiency; The strength of the lubricating oil film decreases, accelerating the mechanical ...
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Bosch Rexroth generated sales of 7 billion euros, a record for the company's history
Despite the challenging environment, Bosch Rexroth achieved double-digit sales growth in fiscal 2022;
Demand for new orders remained strong at 7.3 billion euros;
Record investments in R&D, innovation and production networks;
Through acquisitions and mergers ...
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Types and characteristics of Rexroth gear pumps
Classification and structural characteristics of Rexroth gear pumps
According to the form of gear meshing, it can be divided into external meshing and internal meshing.
According to the different tooth curves, it can be divided into: involute and cycloid.
According to the surface form, it can be divided into spur gear type, helical gear type, herringbone gear ...
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What are the differences between Rexroth proportional valves and Rexroth servo valves?
First of all, there are no strict regulations and explanations for the difference between Rexroth proportional valves and Rexroth servo valves, which is the main reason why most people do not understand the difference between the two.
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Rexroth Hydraulic Pump - Common maintenance knowledge of hydraulic piston pumps
1. Hydraulic pump:
Straight shaft swash plate piston pumps are divided into two types: pressure oil supply type and self-priming oil type. Most of the pressure oil supply hydraulic pumps use oil tanks with air pressure, and there are also hydraulic pumps with oil replenishment sub-pumps to provide pressure oil to the oil inlet of the hydraulic pump. The self-priming oil energy of the self-priming hydraulic pump ...
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A brief introduction to Rexroth hydraulic motors
A Rexroth hydraulic motor is an actuator of a hydraulic system that converts the liquid pressure energy provided by a hydraulic pump into the mechanical energy (torque and speed) of its output shaft.
Hydraulic motors, also known as oil motors, are mainly used in injection molding machinery, ships, hoists, construction machinery, construction machinery, etc.
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Causes and analysis of the failure of Rexroth vane pumps
1) Rexroth vane pumps: Some users do not fill the pump with enough water before starting; It appears that the water has spilled out of the vent, but the air is completely discharged without turning the pump shaft, so that a little air remains in the inlet pipe or pump body.
2) Rexroth vane pump contact inlet pipe horizontal section of the counter-water flow ...
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Precautions for the installation of Rexroth pressure reducing valves
1. When installing, the tap water pressure reducing valve should be installed vertically on the tap water pipeline.
2. The arrow on the tap water pressure reducing valve must be consistent with the arrow on the pipeline.
3. The position of the installation of the pressure reduction method must be greater than 4 meters from the valve outlet.
...
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Features of Rexroth proportional valves:
(1) The electrical signal is easy to transmit, and the remote control can be easily realized.
(2) It can continuously and proportionally control the pressure and flow of the hydraulic system, realize the control of the position, speed and force of the actuator, and reduce the impact when the pressure changes.
（3） ...
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What are the ways to predict maintenance failures for Rexroth piston pumps in advance?
1. Conduct regular testing and diagnosis of Rexroth piston pumps
According to the collected fault signal, draw the online working performance curve of Rexroth piston pump and make an evaluation report. Based on the results of the monitoring, it is decided whether to repair the Rexroth piston pump. Thus determining the most ...
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Introduction to the features of Rexroth's variable displacement piston pump A4VG series
1. Closed-loop hydrostatic drive swash plate axial piston variable pump;
2. The flow rate is proportional to the driving speed and displacement, and can be a stepless variable;
3. With the change of the swing angle of the swash plate, the flow rate increases from 0 to the maximum;
4. The swash plate swings in the middle position, which can be ...
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Rexroth hydraulic pumps – precautions for the use of proportional valves
1. The power domain (working limit) of the proportional valve
For direct-acting electro-hydraulic proportional throttle valves, since the hydraulic force acting on the valve core is proportional to the flow rate and flow rate (pressure) through the valve port, when the working condition of the electro-hydraulic proportional throttle valve exceeds the product of its pressure drop and flow rate, that is, the power meter...
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Rexroth and Magsmart jointly develop a solution for efficient hydrogen compression
Efficient hydrogen compression can halve the total cost of ownership for operators
More economical delivery helps to reduce the price of hydrogen refueling
Automatic seal replacement for easier maintenance
The container-based hydrogen compressor MAX Compression 2.0 is equipped with a digital hydraulic system from Bosch Rexroth ...
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How to adjust the pressure and displacement of the hydraulic piston pump?
1. Adjust the displacement of the pump: The larger the displacement of the hydraulic piston pump, the greater the flow and pressure. The displacement can be adjusted by replacing the displacement of the pump or adjusting the eccentricity distance of the pump.
2. Adjust the valves in the hydraulic system: The valves in the hydraulic system can control the flow and pressure.
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Rexroth hydraulic pumps – energy efficiency comparison of four pump control modes
1. Quantitative pump + relief valve system
This is the most basic and low-cost hydraulic pump system, because the displacement of the pump is fixed, and the output flow is fixed under the condition that the speed of the prime mover is unchanged; A part of the flow drives the load, and the excess flow is returned to the tank through the relief valve, and the overflow ...
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Rexroth Hydraulic Pumps – Hydraulic pumps can be divided into several types according to their working principle
Hydraulic pumps can be divided into four types according to their working principle, the details are as follows.
1. Gear pump
The volume is smaller, the structure is simpler, the cleanliness of the oil is not strict, and the price is cheaper; However, the pump shaft is subject to unbalanced force, severe wear and tear, and large leakage.
Externally meshing gear pump when tooth ...
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What should be paid attention to in the maintenance of Rexroth oil pump?
1. Water will corrode the oil pump, so it is forbidden to use the oil pump to vacuum the substance containing water.
2. For substances containing a large amount of solvent, remove most of the solvent in the oven first, and then use an oil pump to vacuum.
3. Use the vacuum pump in the correct order to prevent suck-back. ...
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Bosch Rexroth has launched Sino-Pack 2022
On March 4th, as a well-known intelligent packaging exhibition in Asia, China International Packaging Industry Exhibition Guangzhou was grandly opened. As the world's leading supplier of complete automation systems, Bosch Rexroth offers a high level of automation and electrical control and linear drive technology.
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