Instructions of QJM series	Model instruction of YLM series low speed high torque hydraulic motor	Selection reference of XZ series crawlers (wheel) walking motor
Selection reference for K series transmission device	Selection reference for W series hydraulic motor

Instructions of QJM series

Application scope:

QJM hydraulic motor, together with various oil pumps, valves and hydraulic components, is an essential component of hydraulic rotating device. It adapts to various mechanical conditions. The hydraulic motor has a number of advantages, such as light weight, small size, wide speed range, stable performance, reliability, impact resistance, high efficiency and long life, etc. It has been widely used in mine construction engineering, metallurgical equipment, petroleum, coal mine, shipbuilding, geological exploration and other industries.。 QJM hydraulic motor’s structure principles 　　QJM hydraulic motor oil with rigid shaft is connected with the rear cover, with oil distribution shaft as radial support and with stator spherical raceway and steel ball as axial support for the rotor block. The output shaft of the rotor is inner spline, which requires flexible cooperation from other drive draft. In this way, the rotor block is floating and the oil distribution shaft is fixed, so it makes the connection of steel pipe and the oil inlet-outlet possible. Pressure oil is delivered to the oil distribution window of each channel through speed change valve and enters each piston cylinder. Pushed by the pressure oil, the piston imposes positive pressure N onto stator through the steel ball and the stator gives back the same force N′ onto the steel ball. N′ can be divided into two forces, radial force and tangential force. Radial force is balanced by oil pressure and tangential force pushes the rotor block through the piston. In this way, rotor block rotates around the oil distribution shaft under the push of F force and produces huge torque as several pistons are being pushed by the pressure oil at the same time. When the piston reaches the apex of the stator with the rotation of the rotor block, it returns to the axis by the push of the stator surface and drives working oil in the pistol into low pressure oil channel though oil distribution shaft window. Repetition of this action converts pressure energy into mechanical energy, which causes the continuous rotation of the hydraulic motor. The change of oil flow direction reverses rotation. Changing the flow into the hydraulic motor can change rotation speed to achieve CVT purpose. The change of displacement of the variable hydraulic motor is achieved by speed-change valve installed in the oil distribution shaft. The location of the speed change valve can be controlled by the pilot valve. (Pilot valve not provided) Major features of QIM hydraulic motor: 1. This type of motor is simple, reliable, small and light because only one steel ball is used for the rolling ball instead of instead of more than two idler wheel and crossbeam in ordinary hydraulic motors. 2. The motors can work continuously under the impact load due to small amount of movement couples inertia and the solidity and reliability of the ball. 3. As a result of the small friction couples and the balance between oil distribution shaft and the rotor, ball plunger couples delivers power through the ball pad made of self-lubricating composite material, with hydrostatic balance and good lubrication and the use of automatic compensation wear soft plastic high-pressure piston ring seal oil, it is of high mechanical and volumetric efficiency and it operates stably in low speed, producing large starting torque. 4. Due to its characteristics, this type of motor requires low back pressure of oil return like 0.3-0.8 MPa normally, the higher the rotation speed, the larger the back pressure. 5. This type of motor has two and three variables, hence, it has greater speed range. 6. Simple structure, convenient dismantlement and repair, no particular requirements for oil cleanliness and the filtration accuracy can be selected according to the needs of supporting oil pump. How to choose properly? 1. There are 3 different pressure levels for each type of hydraulic motor, with rated pressure of 10, 16 and 20MPa respectively. How to choose a kind that best suits operation situation the main machine? The first factor to be considered is the improvement of transmission efficiency. For main machine operating with low transmission efficiency, low rotation speed and large torque, the decisive factor for general efficiency is volumetric efficiency. For hydraulic units with the same transmission power, volumetric efficiency can be improved by lowering the system working pressure. In this case, motor with rated pressure of 10 MPa should be chosen and actual working pressure should be lowered as well. The smaller the transmission speed, the lower the rotation speed and the working pressure, the better. On the contrary, for main machine with strong transmission power and high rotation speed, the general efficiency is decided by mechanical efficiency. In this case, motors with rated pressure of 16MPa or 20MPa should be chosen. Besides, for main machines requiring low speed and stability, motors with big displacement should be chosen. To achieve ideal situation of low speed and stability, working pressure should also be kept at low level. 2. How to choose the right type from different basic models of hydraulic motors with the same displacement? This is related to utility condition and products’ life requirements. For machines with short time clearance operation and short accumulated working time during an overhaul, motors with small numbers should be chosen. For machines with long accumulated working time and long life requirements, motors of big numbers should be chosen. If necessary, motors of high pressure should be used, but product life can be clearly extended when used under low pressure, because the life of QJM hydraulic motor is in inverse ratio of the power of 3.3 to working pressure. Specifically, to lower pressure in half, life can be extended by 10 times. 3. Several formulas used in the design: 1 Actual output torque of the hydraulic motor: M=159（P1-P2）*q*ηm(N·m) In formula, P1 and P2 are the inlet and outlet pressure of hydraulic motor (MPa) q, means the displacement of the hydraulic motor（L/rel） ηm means the mechanical efficiency of the hydraulic motor 2 Actual output of the hydraulic motor: N=M*n*ηm*ηv/9550（KW）， N=Q（P1-P2）*ηm*ηv/60（KW） In formula, n represents the rotation speed of the motor (r/min) Q represents inflow volume of the motor (l/min) ηv represents volumetric efficiency of hydraulic motor 3, rotation speed of the hydraulic motor: N=Q*ηv/q（r/min） 1 Installment and joint requirement of QJM **----** hydraulic motor: 1. All types of the hydraulic motors can be installed and used in any direction 2. As the rotator of QJM motors are in a state of floating, a clearance of 2 to 3 mm needs to be left while connecting the spline during installation, and the spline hole of the motor and the spline shaft of the working mechanism should match each other perfectly, so as to allow free movement of the rotator axially (see figure 2). 3. After the hydraulic motor being properly installed in the machine and connected with pipes, it should be moved by hands or spanner to see whether the rotator moves easily without impediment or heavy-light phenomenon. 4. As the connection between the oil distribution shaft and the stator is rigid, therefore this type of motor allow the use of steel pipes for inflow or outflow of oil pipes. 5. Leak-off oil pipe 　　　　1 The highest spot of the leak-off oil pipe or the height of oil in the oil tank should be higher than the highest line of the motor shell to prevent the motor from evacuation. 　　　　2 The diameter of the leaking pipeline and the joints should be wider than 12mm, and must be connected to the oil tanks directly, but not be linked to the main oil return line(if filtration needed, coarse filter should be used separately). Pressure in the motor should not surpass 0.5MPa. For specific requirements, please contact us directly for further solution. 6. The cleanliness at the connecting oil port must be guaranteed; no solid foreign body is allowed to enter.

（P2）

Model instruction of YLM series low speed high torque hydraulic motor:

Application scope:

YLM series low speed high torque hydraulic motors have good reliability, high efficiency, long life, low noise, wide speed range, so can be used in many scopes, can be widely used in mine construction machinery, hoisting and transport equipment, heavy metallurgical machinery, petroleum coal mine machinery, check deck machinery, machine tools, light industrial products, plastics machinery, geological drilling equipment and so on various mechanical hydraulic transmission system, especially in the mechanical drive such as injection molding machine screw drive, lifting windlass, the drive of roller, the drive of all kinds of rotating mechanism, walking mechanism of crawlers and wheels and so on.

Points for attention:

1. Filter Accuracy: Normal industrial filter accuracy recommended for 25 Micron, on the low-voltage, low-speed conditions, or when the gap will allow for 75-micron accuracy. 2. Viscosity: Best performance of the motor should be in good condition viscosity can be obtained, so motor in most conditions, viscosity 15-1000cm should be within the scope to guarantee work satisfaction. 3. Leakage: Spill ports should be connected with the fuel tank separately; the shell allows the general maximum pressure of 0.1 Mpa. If high pressure, will resulting oil seal damage and causing leaks. 4. Hydraulic motors can be installed in any place, the stand for installing the motor must have sufficient rigidity, when installing, the hydraulic motor connected with the drive spindle output shaft and output shaft be coaxial should be guaranteed. 5. The oil pipe should be higher than the highest level position of the motor shell to prevent the motor of the shell oil emptying. 6. Before the first time start, hydraulic motor shell should be filled with hydraulic oil to prevent damage. 7. Strictly ensure the cleanliness of port connection, no solid foreign body is allowed to enter. 8. Extend the life of hydraulic motor by reducing radial load of the hydraulic motor shaft.

Selection reference of XZ series crawlers (wheel) walking motor:

Application scope:

XZ series crawler (wheel) hydraulic walking motors are made by hydraulic motor, brake, planetary reducer, the valve manifold and so on. XZ series of products is the outer shell transmission, which can be connected directly with the wheels or crawlers driving wheel, with reliable and high efficiency. XZ series of products using high load tapered roller bearings designed to have all the radial and axial force bearing that excavator have at work or by the turn. This product have compact structure, pleasing in appearance, superior performance can be directly replace imported products, widely used in walking mechanism of excavators, non-excavating machine, rock & soil drilling machine, down-hole drilling rig, rotary drilling rig, the boring machine crawler and track vehicles, engineering vehicles etc.

Model instruction:

Pipeline joint please refer to hydraulic scheme:

This series of products have a number of options for each basic model, hydraulic motors of the same size have various displacements. Planetary reducers of the same size have several transmission ratios. Appropriate combinations between them can produce a number of displacements. Hence, in order to meet the operation conditions (namely the traction and walking speed) of machines, a formula is used to calculate the total displacement with given hydraulic system flow Q, sprocket-wheel reference diameter D, and walking speed V: ∑q=0.1885*Q*D*η1*η2*η3/V--------------------------------1 In formula： Q represents theory flow of the pump （L/min） D represents the reference diameter of the wheel or sprocket （mm） V represents the walking speed of crawler or wheel （km/h） η1------- volumetric efficiency of the pump: piston pump η1=0.96～0.97， the gear pump η1=0.88～0.9 η2-------Volumetric efficiency of the control valve:η2=0.985～0.995 η3-----Volumetric efficiency of the hydraulic motor: QJM series motor η3=0.8～0.90 2W/6W series motor η3=0.98～0.99 We could choose proper size of hydraulic motors and planetary reducers based on the result of total displacement in formula 1. There can be various combinations, and to choose a proper one, one should take into consideration the following factors:   First of all, the speed of hydraulic motor can not exceed the maximum rotation speed allowed by hydraulic motors n=5300V/D（r/min）-------------2 V------- represents walking speed（km/h） D-------represents the reference diameter of the wheel or sprocket（mm） Rotation speed of hydraulic motor n1=n*i（r/min）---------3 In formula：i--------V represents planetary reducer transmission ratio From formula 3, we can see, in order to make n1 less than the maximum speed allowed by hydraulic motor, i value should be small better, but the other side of the displacement hydraulic motor q1=∑q/i（ml/rel）-------------4 Formula 4 shows that when ∑q remains unchanged and give i a minimum value, the displacement of the motor, q1 goes up. But for hydraulic motors of the same size, there is a limit for q1, increase unavailable and when q1 is set with a big value, under the same working pressure and rotation speed, with the increase of q1, the life of the hydraulic motor gets shortened (the proportion of the power of 3.3). Therefore, in order to keep the motor at high rotation speed, value i should be set as big as possible and value q1 as small as possible. In this way, the life of motor can be extended. Value ∑q from the formula should be modified according to the displacement of the motor to make it as close to the calculation result as possible. Calculation of the working pressure of the walking device: The rated torque of the transmission device should be decided by the weight of machines, climbing slope requirements, the ground pressure of wheels or crawler and ground working conditions, and other factors. References for these factors can be found in the design of vehicles and excavators or other similar products. When the rated torque M of transmission device is confirmed, the working pressure of hydraulic system P=6.55*M/∑q*η4*η5-△P（Mpa）-------5 式中，△P—represents pressure loss of valves and pipelines in the hydraulic system (Mpa) △P≌1Mpa， M—represents rated torque （N.m） ∑q—represents total displacement（ml/rel），η4— for mechanical efficiency of hydraulic motor:η4=0.9～0.92 η5-----represents transmission frequency of planetary reducer:to the first grade planetary reducer box η5=0.98 To the second grade planetary boxη5=0.96

Selection reference for K series transmission device

Application scope:

1K, 2K series of hydraulic rotary transmission device is composed of the hydraulic motor, planetary reducer, valve manifolds, and brake components. The product is efficient in transmission, reliable while working and wide for options, which is widely used in the rotary drive of excavating equipment, lifting equipment, metallurgical equipment and track equipment.

Model instruction:

Pipeline joint please refer to hydraulic scheme: