Agricultural Machinery

Application Case of BMR-160 Cycloidal Hydraulic Motor in the Cutting Deck Drive of 4LZ-0.8 Small Combine Harvester

I. Working Condition Background

The 4LZ-0.8 small combine harvester is a specialized model designed for small plots in hilly and mountainous areas, suitable for wheat and rice planting areas with a ridge width of ≤ 1.8m. The core operation requirements mainly focus on the feeding action of the threshing wheel on the cutting deck and the cutting action of the cutter.

This working condition has three core problems: First, the cutting deck requires low-speed and high-torque drive, compatible with a rotational speed of 40-80r/min. Traditional gear motors have insufficient torque and are prone to stalling when feeding straw; second, the working environment is harsh, with straw entanglement, dust flying, and high field humidity, which impose strict requirements on the protection and sealing performance of the motor; third, the entire machine needs to be lightweight (with a total weight of ≤ 2.5 tons), and the installation space for the driving components is limited. Traditional motors are too large and cannot be adapted. Previously, this model used ordinary gear motors, and it needed to be shut down for maintenance an average of 1-2 times per month, with a cutting deck stalling rate as high as 15%, seriously affecting the harvesting efficiency in hilly and mountainous areas.

II. Selection Scheme

To address these problems, the technical team selected the BMR-160 cycloidal hydraulic motor as the core component for the cutting deck drive. The core parameters of this motor are matched with the working conditions as follows:

III. System Configuration

1. Hydraulic Circuit Design

A 12MPa constant pressure hydraulic system is adopted, which is matched with a 25L/min flow gear pump to ensure stable pressure supply for the motor. A one-way throttle valve is installed at the oil inlet of the motor to achieve stepless adjustment of the cutter blade speed, meeting the feeding speed requirements for different crops; a back pressure of ≤ 3MPa is set to prevent negative pressure suction when the motor operates at high speed.

2. Oil Fluid and Filtration Specifications

Select N68 anti-wear hydraulic oil, which is suitable for operation temperatures ranging from -10℃ to 60℃ in the field; equip with a 10μm high-pressure filter element, and keep the oil cleanliness at ISO 18/13 level, effectively filtering straw debris and soil particles, and reducing wear on the cycloidal pairs.

3. Optimization of protective measures

Customized dust-proof cover for the motor + integrated protection structure with straw guard. The protection cover adopts a perforated design, which not only prevents the straw from entangling the motor output shaft but also ensures the motor's heat dissipation; the motor shell is treated with anti-corrosion spraying, capable of withstanding the erosion of high humidity in the field.

IV. Implementation Effect

1. Significant Improvement in Operation Performance

The drive of the cutter platform operates smoothly, without any stalling or jittering. The feeding efficiency of the reel cutter has increased by 20%, and the qualified rate of straw cutting has reached 98.5%. Even in extreme working conditions with high density and high humidity of straw, it can still operate stably, completely solving the problem of stalling of traditional motors.

2. Significant Improvement in Reliability and Lifespan

After on-site testing, a single motor operated continuously for 600 hours without failure. The maintenance cycle was extended from the original once per month to once per quarter, resulting in a 70% reduction in annual maintenance costs. The anti-corrosion coating on the motor shell could withstand 500 hours of salt spray tests, and there was no rusting even after 12 months of operation in high-humidity fields.

3. Energy consumption and lightweighting meet standards

Compared with traditional gear motors, the energy consumption of the harvester platform drive has been reduced by 12%. Combined with the energy-saving design of the entire hydraulic system, the fuel consumption per 100 kilometers of the harvester's operation has decreased by 8%. The lightweight design of the motor helps control the overall weight of the machine within 2.4 tons, meeting the transportation and operation requirements of small agricultural machinery in hilly and mountainous areas.

V. Application Summary

The BMR-160 cycloidal hydraulic motor, with its advantages of high torque, small size and high reliability, has perfectly addressed the operational challenges faced by the 4LZ-0.8 small combine harvester in small plots on hilly and mountainous terrain. This solution has been implemented on a large scale, and the market feedback satisfaction rate has reached over 95%. It has become the benchmark selection solution for the drive of the cutter body of small harvesters.

The application case of BMS-125 cycloidal hydraulic motor in the picking mechanism of the 9YFQ-2.2 square baling machine

I. Working Condition Background

The 9YFQ-2.2 square baling machine is an agricultural machinery specifically designed for the recycling of wheat and corn straw. Its core is adapted to small irregular plots and cross-row operation scenarios. It is towed by a tractor using three-point suspension (the total machine weight is ≤ 800kg), and needs to achieve efficient and stable continuous operation processes for efficient straw picking and stable feeding.

There are three core problems with the picking mechanism drive of this model: Firstly, the operation requirements are special. The picking mechanism needs a low-speed and high-torque output of 30-60r/min to meet the feeding requirements for different straw densities. Traditional chain transmission is prone to torque deficiency and resulting stalling. Secondly, the working environment is harsh. There is much straw entanglement, dust, and large fluctuations in humidity in the field. The protection and sealing requirements for the drive components are strict. Thirdly, high reliability is required. The daily operation duration in the autumn harvest season is ≥ 12 hours. Traditional chain transmission wears out quickly, has high noise, and requires 1 monthly maintenance, which seriously affects the harvesting efficiency.

Previously, this model used a chain transmission solution, with a straw picking loss rate of 8% and a baling qualification rate of only 92%. Maintenance costs accounted for 12% of the entire machine's operating costs, making it difficult to meet the efficiency requirements of large-scale agricultural production.

II. Selection Scheme

To address these problems, the technical team selected the BMS-125 cycloidal hydraulic motor as the core component for the picking mechanism drive. The precise matching of its parameters with the working conditions is as follows:

III. System Configuration

1. Hydraulic Circuit Design

A 14MPa constant pressure hydraulic system is adopted, equipped with a 28L/min flow oil pump to ensure stable pressure supply for the motor; a one-way throttle valve is installed at the oil inlet of the motor to achieve stepless speed adjustment of the picker; it can be flexibly adjusted according to different crop types such as straw and corn stalks; a back pressure of ≤ 3MPa is set to avoid negative pressure suction during high-speed operation.

2. Oil Fluid and Filtration Specifications

Select N68 anti-wear hydraulic oil, which is suitable for operation temperatures ranging from -10℃ to 60℃ in the field; equip with a 10μm high-pressure filter element, and keep the oil cleanliness at ISO 18/13 level, effectively filtering straw debris and soil particles, and reducing wear on the cycloidal pairs.

3. Optimization of protective measures

Customized straw protection cover + dust cover integrated structure for the motor. The protection cover adopts a perforated design, which not only prevents the straw from wrapping around the output shaft but also ensures heat dissipation.

IV. Implementation Results

1. Significant Improvement in Operation Performance

The picker's drive is smooth without any lag. The efficiency of straw feeding has increased by 25%, and the picking loss rate has dropped from 8% to below 3%; the baling qualification rate reaches 99%, fully meeting the quality requirements of large-scale agricultural production. When operating on low-lying and uneven land, in combination with the conforming wheel device, the stability of picking has further improved.

2. Significant Improvement in Reliability and Lifespan

After on-site testing, a single motor operated continuously for 500 hours without failure. The maintenance frequency was extended from once a month to once every quarter, resulting in a 70% reduction in annual maintenance costs. The motor's sealing structure effectively prevents dust and moisture from entering, and it can operate continuously in harsh field conditions for 18 months without rusting.

3. Energy consumption and compatibility meet standards

Compared with traditional chain transmission, the energy consumption of the drive system has been reduced by 18%. Combined with the overall energy-saving design of the machine, the fuel consumption per hectare during operation has decreased by 10%. The lightweight and compact design perfectly fits the three-point suspension of the tractor, and is easy to install and dismantle, expanding the adaptability for operations on small and irregular plots.

V. Application Summary

The BMS-125 cycloidal hydraulic motor, with its core advantages of high torque, stepless speed regulation, and high reliability, has perfectly addressed the picking efficiency and maintenance issues of the 9YFQ-2.2 square bale baler. This solution has been implemented on a large scale, and the market feedback satisfaction rate has reached 96%. It has become the preferred solution for the picking device drive of square bale balers, effectively promoting the improvement of efficiency and cost optimization in agricultural mechanized harvesting.