JB/T 9050.1-2015Cylindrical gear reducers - Part 1: General technical requirements (English PDF)

3.1 General requirements

3.1.1 Reducer is allowed to normally work under the following range:

a) Ambient temperature is -20°C ~ 45°C.

NOTE 1: When the ambient temperature is lower than 0°C, the lubricating oil shall be preheated before starting.

b) The maximum speed of the high-speed shaft shall not exceed 3000 r/min.

NOTE 2: When the speed of the high-speed shaft exceeds 1800 r/min, the technical requirements of the reducer shall be determined through consultation between the manufacturer and the user.

c) The peripheral speed of external meshing involute cylindrical gears shall not exceed 25 m/s, and the peripheral speed of internal meshing involute cylindrical gears shall not exceed 20 m/s.

d) The working environment of the reducer shall be a corrosion-free.

e) The selection of lubricating oil for the reducer shall comply with the provisions of JB/T 8831.

3.1.2 The reducer shall be allowed to withstand the load of twice the short-term overload generated when the motor starts. The total cycle time of the permissible short-term overload shall be specified in the standard or technical conditions of the specific type of reducer.

3.1.3 The service life of the reducer is no less than 25 000 h. The service life of bearing is no less than 10 000 h.

3.1.4 The precision of gears shall be no lower than the provisions in Table 1.

3.1.9 The cleanliness of the inner cavity of the reducer shall comply with the provisions of Class C in JB/T 7929-1999.

3.1.10 The position error of the centerline of the anchor bolt hole shall be no greater than 0.2 (D-d) mm.

NOTE: D - the nominal diameter of the anchor screw hole, in millimeters (mm); d - the nominal diameter of the anchor bolts, in millimeters (mm).

3.1.11 The materials used for the main parts of the reducer (gear, shaft and machine body, etc.) shall meet the requirements of the relevant current material standards, and have the certificate of conformity from the manufacturer.

3.1.12 In addition to calculating the rated transmission power, the hardened gear reducer and planetary gear reducer shall also calculate the thermal power to determine the lubrication and cooling method and whether it is necessary to increase the lubrication and cooling device.

3.1.13 When the reducer is in a low-temperature working environment, electric heaters or steam heaters can be used for heating, and the heaters shall be located below the oil surface of the lubricating oil. When electric heating is used, the electric power per unit area shall not exceed 1.0W/cm² to prevent carbonization of lubricating oil.

3.1.14 The transmission efficiency of each stage of single-stage or multi-stage cylindrical gear reducer is no less than 0.98, and the transmission efficiency of each stage of single-stage or multi-stage planetary gear reducer is no less than 0.97.

3.2 Technical requirements for gear manufacturing

3.2.1 Gear precision inspection shall be carried out in accordance with the provisions of GB/T 10095.1-2008; and the items to be inspected are shown in Table 4 of this Standard. Other non-compulsory inspection items shall be determined by the manufacturer.

3.2.2 The surface roughness of the tooth surface shall comply with provisions of Table 5.

6.1 Sign board

Each product must have a fixed sign board at a conspicuous position, and its requirements should comply with the provisions of GB/T 13306, and indicate:

a) Product model and name;

b) Main technical parameters (such as speed, power, torque, weight, etc.);

c) Date of manufacture;

d) Product number; e) Manufacturer's name.

6.2 Product packaging and transportation

6.2.1 The shaft extension of the reducer and the outer surface of the key are coated with anti-rust grease; and wrapped tightly with plastic cloth, tied firmly; or other protective measures are adopted.

6.2.2 Gears, shafts and bearings of the reducer shall be coated with lubricating grease.

6.2.3 The packaging, storage and transportation of the reducer shall comply with the provisions of GB/T 13384 and GB/T 191.

6.3 Accompanying files

It should be packed in a plastic bag and put into a wooden box, the contents of which include:

a) Complete delivery list and packing list; […]