Planetary gear mechanism for electric drive axle

Abstract

The planetary gear mechanism for the electric drive axle comprises a gear ring and a sun gear, four planetary gears are in transmission engagement with the inner side of the gear ring at equal intervals, the four planetary gears are in transmission engagement with the sun gear, planetary gear shafts are fixedly installed on the four planetary gears, and a main planetary gear carrier is rotationally installed at one ends of the four planetary gear shafts; according to the internal meshing type planetary gear mechanism, the positions of the gear ring and the limiting ring are fixed through the limiting assemblies, the internal meshing type planetary gear mechanism is formed, the structure is compact, the transmission efficiency is high, the structure of the planetary gear mechanism is simple, the transmission efficiency is high, and the transmission efficiency is high. The error rate is reduced, quality control and labor cost inspection are facilitated, meanwhile, the limiting assembly can achieve the purpose of quick disassembly through simple operation modes such as pulling and rotating, later maintenance and replacement are facilitated, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of planetary gear mechanisms, in particular to a planetary gear mechanism for an electric drive axle. Background Art

[0002] Planetary gears are gear systems that, in addition to rotating around their own telescopic axes like fixed-axis gears, also rotate along with the planetary carrier around the axes of the other gears. Rotation around their own axes is called "rotation," while rotation around the axes of other gears is called "revolution," much like the planets in the solar system, hence the name.

[0003] However, planetary gear mechanisms usually have two degrees of freedom, so there is no fixed transmission ratio and they cannot be directly used for variable speed transmission. At the same time, planetary gear mechanisms are usually fixed to other components after installation, making them inconvenient to disassemble. During maintenance and replacement, it is more troublesome and reduces work efficiency.

[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a planetary gear mechanism for an electric drive axle to solve the shortcomings of the existing technology. Utility Model Content

[0005] The purpose of the present utility model is to avoid the shortcomings of the prior art and provide a planetary gear mechanism for an electric drive axle. The planetary gear mechanism for an electric drive axle has a ring gear and a sun gear, and four planetary gears are equidistantly engaged with the inner side of the ring gear, and the four planetary gears are engaged with the sun gear. Planetary gear shafts are fixedly mounted on the four planetary gears, and a main planetary gear carrier is rotatably mounted on one end of the four planetary gear shafts, and a secondary planetary gear carrier is rotatably mounted on the other end of the four planetary gear shafts. A limiting ring is mounted on the outer side of the ring gear, and a limiting assembly is mounted on the ring gear and the limiting ring.

[0006] The above-mentioned purpose of the present invention is achieved through the following technical means.

[0007] Provided is a planetary gear mechanism for an electric drive axle, comprising a ring gear and a sun gear, wherein four planetary gears are equidistantly meshed with each other on the inner side of the ring gear, and the four planetary gears are meshed with the sun gear, and planetary gear shafts are fixedly mounted on the four planetary gears, a main planetary gear carrier is rotatably mounted on one end of the four planetary gear shafts, and a secondary planetary gear carrier is rotatably mounted on the other end of the four planetary gear shafts, a limit ring is mounted on the outer side of the ring gear, and a limit assembly is mounted on the ring gear and the limit ring.

[0008] The limiting assembly includes a telescopic shaft and a mounting groove. Four mounting grooves are provided on the gear ring and the limiting ring. The mounting grooves correspond to each other in groups of two. The bottom end of the telescopic shaft is rotatably connected to the mounting groove. A contact ball bearing is installed on the telescopic shaft. The telescopic shaft is connected to the mounting groove through the contact ball bearing. A fixing screw is installed on the top of the side of the telescopic shaft. A limiting fork rod is installed on the bottom of the side of the telescopic shaft. Multiple limiting fork rods correspond to each other in groups of two, and a connecting nut is threadedly connected to the fixing screw on the limiting ring. A reset spring is installed on the telescopic shaft near the telescopic part.

[0009] Four limiting grooves are provided on the outer side of the gear ring, and four limiting blocks are provided on the inner side of the limiting ring corresponding to the four limiting grooves. The limiting grooves and the limiting blocks are installed with corresponding clearances.

[0010] A needle roller bearing is installed on each planetary gear shaft, and planetary gear gaskets are installed near the needle roller bearings near the main planetary gear carrier and the auxiliary planetary gear carrier.

[0011] The utility model fixes the position of the ring gear and the limiting ring through the limiting component to form an internal meshing planetary gear mechanism, which has a compact structure and high transmission efficiency. The planetary gear mechanism has a simple structure, reduced error rate, and is convenient for quality control and inspection of labor costs. At the same time, the limiting component can be quickly disassembled through simple operations such as pulling and rotating, which is convenient for later maintenance and replacement, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0013] Figure 1 It is a schematic diagram of the main structure of a planetary gear mechanism for an electric drive axle of the present utility model.

[0014] Figure 2 It is a partial cross-sectional structural diagram of a planetary gear mechanism for an electric drive axle of the utility model.

[0015] Figure 3 It is an enlarged schematic diagram of point A of a planetary gear mechanism for an electric drive axle of the present utility model.

[0016] Figure 4 This is a schematic structural diagram of a limiting component of a planetary gear mechanism for an electric drive axle of the utility model.

[0017] Figure 5 It is a partial structural diagram of a planetary gear mechanism for an electric drive axle of the utility model.

[0018] from Figures 1 to 5 Including:

[0019] 1. Main planetary gear carrier;

[0020] 2. Auxiliary planetary gear carrier;

[0021] 3. Planetary gear shaft;

[0022] 4. Planetary gear gasket;

[0023] 5. Needle roller bearings;

[0024] 6. Planetary gear;

[0025] 7. Ring gear;

[0026] 8. Sun gear;

[0027] 9. Limiting components;

[0028] 91. Telescopic shaft, 92. Mounting slot, 93. Contact ball bearing, 94. Fixing screw, 95. Limiting fork rod, 96. Connecting nut, 97. Return spring;

[0029] 10. Limiting ring;

[0030] 11. Limiting slot;

[0031] 12. Limit block. DETAILED DESCRIPTION

[0032] The present invention will be further described with reference to the following embodiments.

[0033] Example 1.

[0034] like Figure 1-5 As shown, a planetary gear mechanism for an electric drive axle includes a ring gear 7 and a sun gear 8. Four planetary gears 6 are equidistantly meshed with each other on the inner side of the ring gear 7. The four planetary gears 6 are meshed with the sun gear 8. Planetary gear shafts 3 are fixedly mounted on the four planetary gears 6. A main planetary gear carrier 1 is rotatably mounted on one end of the four planetary gear shafts 3, and a secondary planetary gear carrier 2 is rotatably mounted on the other end of the four planetary gear shafts 3. A limit ring 10 is installed on the outer side of the ring gear 7, and a limit assembly 9 is installed on the ring gear 7 and the limit ring 10.

[0035] The planetary gear mechanism consists of a sun gear 8, a ring gear 7, a primary planetary gear carrier 1, a secondary planetary gear carrier 2, and four planetary gears 6, forming a planetary gear train. When the planetary gear mechanism is operating, the four planetary gears 6 rotate around the planetary gear shaft 3 and, along with the two planetary gear carriers, around the sun gear 8. Just like the motion of planets in the sky, they experience both rotation and revolution.

[0036] The main planetary gear carrier 1, the auxiliary planetary gear carrier 2, the planetary gear shaft 3, the planetary gear spacer 4, the needle roller bearing 5, the planetary gear 6, the ring gear 7, the sun gear 8, and the limiting ring 10 are arranged in a reasonable manner, and the positions of the ring gear 7 and the limiting ring 10 are fixed by the limiting assembly 9, so that the planetary gear row becomes a mechanism with only one degree of freedom, forming an internal meshing planetary gear mechanism with a compact structure and high transmission efficiency.

[0037] The limiting assembly 9 includes a telescopic shaft 91 and a mounting groove 92. Four mounting grooves 92 are provided on the gear ring 7 and the limiting ring 10. The mounting grooves 92 correspond to each other in pairs. The bottom end of the telescopic shaft 91 is rotatably connected to the mounting groove 92. A contact ball bearing 93 is installed on the telescopic shaft 91, and the telescopic shaft 91 is connected to the mounting groove 92 through the contact ball bearing 93.

[0038] The telescopic shaft 91, the fixed screw 94 and the limiting fork rod 95 are all fixedly connected by threaded assembly. Multiple limiting fork rods 95 are engaged and abutted in pairs. The fixing screw 94 located on the limiting ring 10 is threadedly connected with a connecting nut 96, and a reset spring 97 is installed on the telescopic shaft 91 near the telescopic part.

[0039] If the planetary gear mechanism needs to be disassembled, the staff will pull the limit assembly 9 to move the two fixing screws 94 out of the horizontal groove of the installation groove 92, and then rotate the connecting nut 96 to separate the two fixing screws 94. After separation, the two fixing screws 94 are screwed to the vertical part of the installation groove 92 to separate the two limiting fork rods 95 from the contact limit, and then let go. The reset spring 97 will drive the two fixing screws 94 to reset.

[0040] Four limiting grooves 11 are provided on the outer side of the gear ring 7, and four limiting blocks 12 are provided on the inner side of the limiting ring 10 corresponding to the four limiting grooves 11. The limiting grooves 11 and the limiting blocks 12 are installed with corresponding clearances. After the limiting assembly 9 is released, the planetary gear mechanism can be disassembled by pulling it out of the limiting ring 10 along the limiting blocks 12.

[0041] A needle roller bearing 5 is installed on each planetary gear shaft 3. The needle roller bearing 5 has the characteristic of compact radial structure. The planetary gear 6 is connected to the main planetary gear carrier 1 and the auxiliary planetary gear carrier 2 through the needle roller bearing 5. Planetary gear gaskets 4 are installed near the needle roller bearings 5 near the main planetary gear carrier 1 and the auxiliary planetary gear carrier 2. The planetary gear gaskets 4 are mainly used to adjust the bearing clearance, reduce friction and wear, maintain lubrication, isolate impurities, increase stability and safety, etc.

[0042] The utility model arranges the main planetary gear carrier 1, the auxiliary planetary gear carrier 2, the planetary gear shaft 3, the planetary gear gasket 4, the needle roller bearing 5, the planetary gear 6, the ring gear 7, the sun gear 8, and the limiting ring 10 in a reasonable manner, and fixes the positions of the ring gear 7 and the limiting ring 10 by the limiting component 9 to form an internal meshing planetary gear mechanism with a compact structure and high transmission efficiency. The structure of the planetary gear mechanism is simple, the error rate is reduced, and quality control and inspection labor costs are convenient. At the same time, the limiting component 9 can be quickly disassembled by simple operations such as pulling and rotating, which is convenient for later maintenance and replacement, and improves work efficiency.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A planetary gear mechanism for an electric drive axle, characterized by: It includes a ring gear and a sun gear, the inner side of the ring gear is equidistantly meshed with four planetary gears, the four planetary gears are meshed with the sun gear, the four planetary gears are fixedly mounted on a planetary gear shaft, one end of the four planetary gear shafts is rotatably mounted on a main planetary gear carrier, the other end of the four planetary gear shafts is rotatably mounted on a secondary planetary gear carrier, a limit ring is mounted on the outer side of the ring gear, and a limit assembly is mounted on the ring gear and the limit ring; The limit assembly includes a telescopic shaft and a mounting slot. Four mounting slots are provided on the gear ring and the limit ring. The mounting slots correspond to a group of two. The bottom end of the telescopic shaft is rotatably connected to the mounting slot. A contact ball bearing is installed on the telescopic shaft. The telescopic shaft is connected to the mounting slot through the contact ball bearing. A fixing screw is installed on the top of the side of the telescopic shaft. A limiting fork rod is installed on the bottom of the side of the telescopic shaft. Multiple limiting fork rods correspond to a group of two and are engaged with each other. A connecting nut is threadedly connected to the fixing screw on the limit ring. A reset spring is installed on the telescopic shaft near the telescopic part.

2. The planetary gear mechanism for an electric drive axle according to claim 1, characterized in that: Four limiting grooves are provided on the outer side of the gear ring, and four limiting blocks are provided on the inner side of the limiting ring corresponding to the four limiting grooves. The limiting grooves and the limiting blocks are installed with corresponding clearances.

3. The planetary gear mechanism for an electric drive axle according to claim 1, characterized in that: A needle roller bearing is installed on each of the planetary gear shafts, and planetary gear washers are installed near the main planetary gear carrier and the auxiliary planetary gear carrier on the needle roller bearings.

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