GB/T 25014-2026Marine bulkhead gearing (English PDF)

4.3.1 Model Marking

4.3.2 Tagging Example The shaft end diameter of the marine bulkhead drive is 80mm. The marking for the water-cooled marine bulkhead drive is.

5.3 Appearance

5.3.1 The outer surface of the transmission device shall be free from burrs, flash, scale, rust, chips, oil stains and dust.

5.3.2 The surface of the transmission device housing shall be coated with primer and topcoat, and shall not peel.

5.4 Materials

5.4.1 The materials of the main components of the transmission device are shown in Table 3.

5.4.2 Materials with mechanical and physical properties superior to those specified in Table 3 are permitted.

5.4.3 When seawater is used for cooling water chambers, the materials of the cooling water chambers should be made of corrosion-resistant materials or take corrosion-resistant measures.

5.5 Design

5.5.1 Applicable Environment The applicable environments for the transmission device are shown in Table 4.

5.5.2 S-type transmission device

5.5.2.1 It shall consist of at least a pair of self-aligning roller bearings, a rotating shaft lip seal, a housing, a gland, etc.

5.5.2.2 The cooling water chamber shall be equipped with a temperature display device, and the lubricating oil chamber shall be equipped with an oil level indicator and a temperature monitoring sensor.

5.5.2.3 Pipe fittings and vent plugs should be provided.

5.5.2.4 A temperature sensor mounting interface should be provided at the bearing on the pump compartment side, and an alarm should be triggered when the temperature exceeds 65°C.

5.5.2.5 The oil level indicator interface shall comply with the requirements of Chapter 3 of JB/T 7941.4-1995.

5.5.2.6 The cooling water inlet pressure should not exceed

0.4 MPa.

5.5.2.7 The shell is a steel structure.

5.5.2.8 At least one end of the shaft should be a flexible connection.

5.5.2.9 Two sealing rings are installed at the pump compartment end of the device to prevent lubricating oil leakage and dust from entering the bearings and causing the device to overheat.

5.5.3 K-type transmission device

5.5.3.1 It consists of a sliding bearing, a rotating shaft lip-shaped rubber seal, a spacer, a housing, and a gland.

5.5.3.2 Lithium-based grease should be used for lubrication at the sealing points.

5.5.3.3 At least one end of the shaft should be a flexible connection.

5.5.3.4 A temperature sensor mounting interface should be provided at the bearing on the pump compartment side, and an alarm should be triggered when the temperature exceeds 65°C.

5.5.3.5 The housing is made of cast steel and should be equipped with an exhaust port above the lubricating oil chamber.

5.5.3.6 Air cooling equipment should be installed in appropriate locations in the engine room for air exchange.

5.6 Performance

5.6.1 Sealing performance When the transmission device is static, the leakage of lubricating oil is 0, and when it is dynamic, the leakage of lubricating oil is no more than

0.5 mL/h.

5.6.2 Abrasion resistance After the transmission device operates continuously at maximum speed for 100 hours, the sum of the wear of its sealing ring lips should not exceed 20µm.

5.6.3 Shell pressure resistance The transmission device housing was purged with

0.3 MPa of compressed air and held at that pressure for 30 minutes. No air leakage was observed.

5.6.4 Casing Temperature

5.6.4.1 The temperature of the water chamber portion of the housing of the S-type transmission device should not exceed 60°C, and the temperature of the oil chamber portion should not exceed 65°C.

5.6.4.2 The housing temperature of the K-type transmission device should not exceed 70°C.

5.7 Reliability

5.7.1 The mean time between failures (MTBF) of the S-type transmission should be no less than 5000 hours.

5.7.2 The mean time between failures (MTBF) of the K-type transmission should be no less than.2000 hours.

6.5 Sealing performance

6.5.1 Static sealing Install the transmission device on the test bench, add water and lubricating oil to the water chamber and oil chamber to

1.25 times the design pressure, and maintain this pressure for no less than [time missing]. Detect water and lubricating oil leakage within 15 minutes.

6.5.2 Dynamic sealing The tests were conducted in accordance with Chapters 4 and 5 of GB/T 13871.4-2023.

6.6 Abrasion resistance The wear resistance test of the sealing ring is conducted according to the following method.

a) Remove the clamping spring, lay it flat at room temperature for 72 hours, and measure the lip diameter of the sealing ring;

b) After numbering the sealing rings according to the measurement sequence, install the springs and assemble the compartment transmission device;

c) Install the transmission device on the test bench and operate under the following conditions. at the highest speed of the transmission shaft, the water pressure in the water chamber is

0.3 MPa, and the temperature of the lubricating oil is... The test was conducted at a temperature not exceeding 65°C for a cumulative run of 100 hours.

d) Remove the sealing ring and the clamping spring, then place it flat at room temperature for 72 hours before measuring the lip diameter;

e) Calculate the wear amount according to formula (1).

6.7 Shell pressure resistance The compressive strength of the housing of the transmission device is tested according to the following method.

a) Seal off both ends of the outer casing of the transmission device;

b) Connect the oil filler and water filler ports on the outer casing to the compressed air source, block all other openings, and immerse the casing in a water tank;

c) Introduce compressed air at

7.2 Type Testing

7.2.1 Timing of Inspection Type testing should be conducted under any of the following circumstances.

a) First-of-its-kind product;

b) Resuming production after a two-year or longer suspension;

c) Significant changes in product design, materials, or processes may affect product performance;

d) Requirements from the superior product quality supervision department.

7.2.2 Inspection Items The test items for type testing are shown in Table 5.

7.2.3 Number of samples tested The number of samples tested for type testing is one unit.

7.2.4 Acceptance Criteria If all inspection items of the inspected transmission device meet the requirements, the type inspection of the transmission device is deemed qualified. If the materials used in the test do not meet the requirements, the type test of the transmission device is deemed unqualified; if other test items of the tested transmission device do not meet the requirements... If required, double the sampling should be taken for retesting. If the retest meets the requirements, the type inspection of the transmission device is deemed qualified. If the retest still does not meet the requirements, it is deemed... The type inspection of the transmission device failed.

7.3 Factory Inspection

7.3.1 Inspection Items The inspection items and order for factory inspection are shown in Table 5.

7.3.2 Number of samples tested Each product leaving the factory should undergo factory inspection.

7.3.3 Acceptance Criteria If all inspection items of the inspected transmission device meet the requirements, the transmission device is deemed to have passed factory inspection. If the inspected transmission device... If the materials used in the transmission device do not meet the requirements, the device is deemed to have failed the factory inspection; if other inspection items of the transmission device do not meet the requirements... If required, corrective measures should be taken and the device re-inspected. If the re-inspection meets the requirements, the transmission device is deemed to have passed factory inspection. If the re-inspection still does not meet the requirements... If so, the transmission device is deemed to have failed the factory inspection.

8.2 Packaging

8.2.1 Product packaging shall be in accordance with GB/T 13384.

8.2.2 The product shall be accompanied by a product inspection certificate and a packing list when it leaves the factory.

8.3 Transportation During transportation, measures should be taken to protect against rain, impact, and wear and tear on the slings.

8.4 Storage It should be stored in a dry, well-ventilated warehouse, avoiding humid and high-temperature environments.