Herringbone planetary transmission

Abstract

The invention discloses a herringbone-tooth planetary transmission device, which comprises a sun wheel, a planet wheel and an inner tooth ring, and is characterized in that herringbone teeth are respectively adopted by the sun wheel, the planet wheel and the inner tooth ring; a planet carrier is fixed, and the planet wheel only rotates without revolution; the inner tooth ring and the sun wheel respectively rotate around own axes; the inner tooth ring is a combined-type segmented herringbone inner tooth ring and is formed by combining and connecting two or more than two single-segment herringbone tooth rings through hinge-hole bolts which are forwards and backwards arranged; the left and right turning wheel teeth of the single-segment herringbone tooth rings are respectively formed through integral machining, and a direct horizontal-cutting segmenting mode is adopted. The herringbone-tooth planetary transmission device has the beneficial effects that the assembly of herringbone-tooth planetary transmission is realized, the reliability of a transmissions system is improved, the assembling precision is guaranteed, the inner tooth ring with a large diameter can be obtained on a smaller machine tool through segmented machining, the machining process and the assembling process are mature, simple and feasible, the transporting, packaging, assembling and disassembling processes are quite convenient, the maintenance and the replacement of the single-segment tooth rings can be realized, and therefore a large number of materials and machining expenses are saved.

Description

technical field [0001] The invention relates to the technical field of planetary transmission, in particular to a herringbone planetary transmission. Background technique [0002] Compared with ordinary gear transmission, planetary gear transmission has many unique advantages. Its most notable feature is that it can perform power splitting when transmitting power; at the same time, its input shaft and output shaft are coaxial, that is, the output shaft and input shaft are set on the same main axis. Therefore, planetary gear transmission has been used by people instead of ordinary gear transmission, and as a reducer, speed increaser and speed change device in various mechanical transmission systems. Especially for the gear transmissions of aero-engines, lifting transportation, petrochemical and weapons, etc. that require small size, small mass, compact structure and high transmission efficiency, and gear transmissions of vehicles such as cars and tanks that require different...

AI Technical Summary

Problems solved by technology

Due to the inability to solve the assembly problem of herringbone inner ring gear planetary transmission, the current planetary transmission field has to use straight tooth or small helix angle helical tooth inner ring gear. For large diameter herringbone inner ring gear, it is limited to the maximum processing diameter limit of equipment processing. It is even more difficult to process. Even if the integral herringbone ring gear is processed by a super-large machine tool, it is difficult to complete the entire planetary transmission assembly. The sun gear, planetary gear, and ring gear are all integral herringbone gears, which will not be able to be assembled.

Segmental processing of large-diameter herringbone inner ring gears is an inevitable trend in the development of large-scale herringbone gear planetary transmissions. The inner ring gear still cannot be machined. The diameter of the integral ring gear depends on the maximum machining diameter of the gear shaping machine tool. Small equipment cannot be used to process large workpieces, and the processing capacity of the machine tool can be fully utilized.

Once one tooth or a few teeth of the integral ring gear fail, the ring gear has to be replaced as a whole, which consumes a lot of financial and material resources

In addition, when two helical inner ring gears are combined and connected, it is difficult to ensure that the two ring gears in the left and right directions have good alignment. Each tooth of the entire ring gear has a relatively large tooth alignment in the left and right directions. error

[0005] At present, the segmental design technology of the herringbone inner ring gear has also appeared. The patent document [CN101793308A] discloses an invention method of a herringbone planetary reducer. The key technology is the segmented herringbone inner ring gear. The assembly problem of the planetary transmission also solves the manufacturing problem of the large-diameter internal ring gear. It is possible to use a small machine tool to process the large-diameter internal ring gear. It is indeed a major breakthrough and innovation in technology. The method of segmenting both in the direction and the axial direction, the left-handed and right-handed gear teeth are divided in the axial direction, and then combined with bolts, so there must be a large error in the neutrality, especially the two tooth segments on the radial circumference The connection is made by punching holes on the inclined surface and connected by bolts. It is very difficult to process the holes on the inclined surface, especially the positioning is difficult. The positioning of the inclined holes is extremely inaccurate. The holes are particularly easy to deviate, and the position and shape accuracy of the holes are difficult to guarantee. , and the step hole is still processed, the thread is processed in the inner hole, and the positioning sleeve is also installed. How to press the positioning sleeve at the bottom of the deep hole is also very difficult to install the positioning sleeve. Conventional techniques and methods cannot be solved at all. Sleeve, how to ensure the accurate position of the press-in, how to measure, how to ensure that the pressed-in positioning sleeve is not deformed, the space of the inclined hole is extremely narrow, there is not enough space for a wrench to tighten the bolt, and the problem of how to tighten the bolt has become a problem. Due to the limitation of the space position and structure of the inclined surface drilling, only one hole can be processed on each side of the inclined surface of the two tooth segments, and only two bolts are used to connect the large-diameter inner ring gear, which has huge hidden dangers in terms of strength and rigidity, and this kind of The inclined-plane drilling method destroys the integrity of the surface on both sides of the ring gear, causing stress concentration, and there will be many sharp metal corners, which are extremely sharp, which may easily cause scratches on the operator and cause safety accidents. The two-tooth section of this technology The connection accuracy is guaranteed by the inclined hole. From this, it can be seen that the assembly accuracy of the combined connection of the two tooth segment inclined surfaces cannot be guaranteed. The bolt plays the role of connection, and the positioning function is extremely limited.

As a precision transmission part, gears are very sensitive to errors. In addition, it is difficult to ensure that the two ring gears in the left and right rotation directions are well aligned when the separate single-section inner ring gear is combined axially and radially. Each tooth has a large tooth alignment error in the left and right directions, and the radial direction and the circumferential direction cannot be accurately positioned, which will generate a large axial force and affect the stability of the transmission, etc., thus losing the herringbone teeth some of the advantages

And the planetary transmission principle announced by the patent document [CN101793308A] is the most common 2K-H planetary transmission. The technical solution adopted is that the ring gear is fixed and the planetary carrier rotates, so that the planetary gear and the planetary gear bearing not only rotate around their own axis , it has to rotate with the planetary frame to perform revolution, so that it bears huge centrifugal force, and the supporting bearing of the planetary wheel is very easy to fail; because the planetary wheel and the planetary wheel bearing rotate with the planetary frame all the time, the position in space is not fixed and changes all the time, so It is impossible to use the fixed-point pressure lubrication method to lubricate and cool the planetary gear and planetary gear bearings. It can only be periodic intermittent lubrication. Because the bearings run at high speed and there is no lubricating oil for cooling at all times, it is easy to cause the bearings to heat up and burn. Bad, the planetary gear is also prone to various forms of gear failure due to poor lubrication and heat dissipation

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