Among all the accessories of planetary gear reducer, gear is an indispensable and the most critical mechanical transmission component. When a planetary gear reducer is working, it can change the form and speed of movement by transmitting the motion and power between any two axes in space through the meshing of gear teeth.
So, what are the requirements of planetary gear reducers for gears? How does SGR Heavy Industry Machinery Co.,Ltd. select gears ?
(1) Selection criteria for gear of SGR
Shanghai SGR Heavy Industry Machinery Co.,Ltd. focuses on the design and development of gear reducers. It has been deeply engaged in the field of gear transmission for more than 10 years and has always been rock-solid in its original intention of technological innovation.
In terms of gear selection, the gear reducer manufacturer SGR has formulated industry standards that meet or even exceed the requirements of planetary gear reducers, ensuring that the gears meet or exceed the requirements of the mechanical transmission industry and striving to become the leader in gear transmission devices.
The appearance standards of gears are as follows:
(1) The gear surface should not have burrs, cracks, glue marks and pitting marks.
(2) The material of the needle gear housing should not be too low and should be artificially aged.
(3) The output shaft journal should be free of defects such as cracks, burrs, scratches, etc.
(4) The limit deviation of the arm eccentricity.
(5) There should be no cracks or sand holes between the machine bases, and the joint surface with the needle gear should be flat and smooth to ensure that the product is tightly assembled.
(6) The surface of the needle tooth sleeve and pin should not have burrs, cracks, scratches, glue damage, etc.
(7) Skeleton rubber oil seal: The oil seal lip should be sharp and smooth, the opening should have sufficient radial force, be soft and flexible, and the spring tension should be moderate. The oil seal is not allowed to have defects such as aging, wrinkles, and cracks.
(8) The surface layer of the sealing ring is smooth, the pore size is uniform, and the surface layer is free of scratches and cracks.
(9) The surface layer of the sealing gasket is smooth, flat, and free of burrs and burrs.
It is based on such strict standards in the process of selecting gear accessories that the planetary gear reducers produced by SGR have a wide range of applications, constant transmission ratio, high efficiency and long service life.
(2) Requirements for gear accessories of planetary gear reducers
From the perspective of the mechanical transmission industry’s requirements, the gear accessories of the planetary gear reducer should meet the following requirements:
a.Meet the mechanical properties of the gear, including strength, hardness, plasticity and toughness. When the planetary gear reducer is working, the gears are meshing, there will be contact stress at the contact of the tooth surface, and there will be large bending stress at the root of the tooth, which may cause the strength of the tooth surface or tooth body to fail.
b.The relative sliding of each point on the gear surface will cause wear. The main failure forms of gears include pitting, bonding, plastic deformation and tooth fracture. When the gears are in meshing, there are still different contact stresses when the gear surfaces agearre in contact. There are large differences in the root of the gear, which affects the maximum bending stress and may cause gear surface failure. There may be contrast sliding at each point on the gear surface, and even severe wear may occur. Therefore, the gear material should maintain a high bending fatigue strength and contact fatigue strength, the gear surface should have sufficient hardness and wear resistance, and the core should have a certain strength and toughness.
c.When determining the hardness of the large and small gears, it is important to make sure that the hardness of the small gear surface is 30-50 HBS higher than that of the large gear, because the small gear is loaded more times than the large gear, the small gear tooth root is thinner, and the strength is lower than that of the large gear. In order to make the tooth strength of the two gears close to equal, the tooth surface of the small gear should be harder than that of the large gear.
d.Pay attention to the process performance of the gears. During the production and processing of planetary gear reducers, the accessories need to undergo different degrees of heat treatment processes to achieve the required hardness range. The manufacturing of gears also requires several processes such as forging, cutting, and heat treatment, so pay attention to the process performance of the materials when selecting them.
“If you want to do your work well, you must first sharpen your tools.” If you choose the right gear accessories with good performance, the product performance and quality of the planetary gear reducer will be guaranteed.( Author, SGR, Angie Zhang)
Related Video Link:
https://www.tiktok.com/@gear.reducer/video/7387579897566203166