Planetary gear drive built-in tension positioning wheel shaft structure

Abstract

This utility model relates to the field of planetary gear transmission technology and discloses a built-in tensioning and positioning wheel shaft structure for planetary gear transmission. This structure includes a planetary carrier and a positioning wheel shaft assembly. Planetary gear bearings are mounted on the planetary carrier, and planetary gears are mounted on the planetary gear bearings. The positioning wheel shaft assembly passes through the planetary carrier, the planetary gear bearings, and the planetary gears, connecting them together to form the built-in tensioning and positioning wheel shaft structure. The positioning wheel shaft assembly includes a positioning wheel shaft, on which are provided expansion sleeve one and expansion sleeve two. Expansion sleeve one has an expansion oil chamber one, and expansion sleeve two has an expansion oil chamber two. The positioning wheel shaft assembly also includes a compression oil chamber and oil passages one and two. This utility model can achieve the function of not damaging the mating surfaces of parts during assembly and disassembly, while ensuring the load-bearing capacity and accurate positioning of the wheel shaft in use.

Description

Technical Field

[0001] This utility model relates to the field of planetary gear transmission technology, specifically to a planetary gear transmission built-in tensioning and positioning wheel and shaft structure. Background Technology

[0002] Planetary gear reducers are commonly used in the mechanical transmission industry. They are characterized by uniform load distribution and compact structure, and are widely used in the field of mechanical transmission. Planetary gears utilize axle positioning; to ensure load-bearing capacity and accurate positioning, existing solutions employ interference fit assembly. During assembly, either press-fitting or freezing methods are used.

[0003] However, the traditional assembly methods described above have some drawbacks: 1. High risk of assembly damage: Interference fits require significant mechanical pressure or temperature differences, which can easily lead to irreversible damage such as scoring and wear on the inner surface of the planetary carrier and the outer surface of the gear shaft, affecting the fit accuracy and service life of the parts. 2. Difficult disassembly and fragile parts: Disassembly requires additional reverse force or secondary damage to the fit structure, further aggravating part wear and increasing maintenance costs and downtime. 3. Insufficient stability of positioning accuracy: The accuracy of interference fits depends on assembly process control. Improper operation may lead to positioning deviations, affecting the smoothness of planetary gear transmission and the uniformity of load distribution. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a planetary gear transmission with an internal tensioning and positioning shaft structure, solving some deficiencies of traditional assembly methods: 1. High risk of assembly damage: Interference fits require the application of significant mechanical pressure or temperature differences, easily leading to irreversible damage such as scoring and wear on the inner surface of the planetary carrier and the outer surface of the shaft, affecting the fitting accuracy and service life of the parts. 2. Difficult disassembly and fragile parts: Disassembly requires the application of additional reverse force or secondary damage to the fitting structure, further aggravating part wear and increasing maintenance costs and downtime. 3. Insufficient positioning accuracy and stability: The accuracy of interference fits depends on assembly process control; improper operation may lead to positioning deviations, affecting the smoothness of the planetary gear transmission and the uniformity of load distribution.

[0005] This utility model provides the following technical solution: a planetary gear transmission built-in tensioning positioning wheel shaft structure, including a planetary carrier and a positioning wheel shaft assembly. The planetary carrier is provided with a planetary gear bearing, and a planetary gear is installed on the planetary gear bearing. The positioning wheel shaft assembly passes through the planetary carrier, the planetary gear bearing, and the planetary gear and is connected together to form a built-in tensioning positioning wheel shaft structure.

[0006] The positioning wheel axle assembly includes a positioning wheel axle, on which expansion sleeve one and expansion sleeve two are provided. Expansion sleeve one has an expansion oil chamber one, and expansion sleeve two has an expansion oil chamber two. The positioning wheel axle assembly also includes a compression oil chamber and oil passage one and oil passage two.

[0007] Preferred technical solution 1: The compression oil chamber is provided with a seal and a plunger, and a clamping screw is installed on the internal thread of the compression oil chamber, and a locking nut is installed on the external thread of the clamping screw.

[0008] Preferred technical solution 2: The compression oil chamber is connected to the second oil circuit, and the two ends of the second oil circuit are respectively connected to the first expansion oil chamber and the second expansion oil chamber.

[0009] Preferred technical solution three: The outer circles of the expansion sleeve one and the expansion sleeve two are fitted with the inner hole of the planetary carrier with a small clearance fit.

[0010] Preferred technical solution four: The compression oil chamber is filled with hydraulic oil.

[0011] Compared with existing technologies, this utility model provides a planetary gear transmission built-in tensioning positioning wheel and shaft structure, which has the following advantages: The positioning wheel and shaft are integrated with expansion sleeve one and expansion sleeve two. Hydraulic oil is injected into the positioning wheel and shaft, expansion oil chamber one, expansion oil chamber two, and compression oil chamber. Seals and plungers are installed, and tightening screws and lock nuts are screwed in to form a positioning wheel and shaft assembly. This assembly is then connected to the planetary carrier, planetary gear bearings, and planetary gears, collectively constituting a planetary gear transmission built-in tensioning positioning wheel and shaft structure. This ensures that the mating surfaces of parts are not damaged during assembly and disassembly, while maintaining the load-bearing capacity and accurate positioning function of the wheel and shaft during use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a partial structural cross-sectional view of the present invention.

[0014] In the diagram: 1. Positioning wheel shaft; 2. Expansion sleeve one; 3. Expansion oil chamber one; 4. Oil passage one; 5. Locking nut; 6. Clamping screw; 7. Piston; 8. Seal; 9. Expansion sleeve two; 10. Expansion oil chamber two; 11. Oil passage two; 12. Compression oil chamber; 13. Planetary carrier; 14. Planetary gear bearing; 15. Planetary gear; 16. Positioning wheel shaft assembly. Detailed Implementation

[0015] Please see Figure 1-2 ,

[0016] Example 1: A planetary gear transmission built-in tensioning positioning wheel shaft structure, including a planetary carrier 13 and a positioning wheel shaft assembly 16. A planetary gear bearing 14 is provided on the planetary carrier 13, and a planetary gear 15 is installed on the planetary gear bearing 14. The positioning wheel shaft assembly 16 passes through the planetary carrier 13, the planetary gear bearing 14, and the planetary gear 15 and is connected together to form a built-in tensioning positioning wheel shaft structure.

[0017] The positioning wheel axle assembly 16 includes a positioning wheel axle 1, on which expansion sleeve 1 2 and expansion sleeve 2 9 are provided. Expansion oil chamber 1 3 is provided on expansion sleeve 1 2, and expansion oil chamber 2 10 is provided on expansion sleeve 2 9. The positioning wheel axle assembly 16 also includes a compression oil chamber 12 and oil passage 1 4 and oil passage 2 11.

[0018] Example 2: The difference between this example and Example 1 is that the compression oil chamber 12 is provided with a seal 8 and a plunger 7, a clamping screw 6 is installed in the internal thread of the compression oil chamber 12, and a locking nut 5 is installed in the external thread of the clamping screw 6.

[0019] Example 3: The difference between this example and Example 1 is that the compression oil chamber 12 is connected to the second oil passage 11, and the two ends of the second oil passage 11 are connected to the first expansion oil chamber 3 and the second expansion oil chamber 10, respectively.

[0020] Example 4: The difference between this example and Example 1 is that the outer circles of expansion sleeve 1 2 and expansion sleeve 2 9 are fitted with the inner hole of planet carrier 13 with a small clearance.

[0021] Example 5: The difference between this example and Example 1 is that the compression oil chamber 12 is filled with hydraulic oil.

[0022] In summary, this planetary gear transmission with its built-in tensioning and positioning wheel and shaft structure allows for assembly without damage because the outer circles of the expansion sleeves 1-2 and 2-9 of the positioning wheel and shaft assembly 16 have a small clearance fit with the inner hole of the planetary carrier 13. After the positioning wheel and shaft 1 is assembled, tightening the clamping screw 6 pushes the plunger 7, compressing the hydraulic oil in the compression chamber 12. The hydraulic oil then enters the expansion chambers 1-3 and 2-10 through oil passages 1-4 and 2-11 respectively, pushing the expansion sleeves 1-2 and 2-9 outwards. This eliminates the clearance between the outer circles of the expansion sleeves 1-2 and 2-9 and the inner hole of the planetary carrier 13, and presses against the inner hole of the planetary carrier 13, causing elastic deformation. This ensures a tight fit between the two, fulfilling the functions of load bearing and accurate positioning. Finally, tightening the locking nut 5 prevents the clamping screw 6 from loosening. This achieves both load bearing capacity and accurate positioning.

[0023] During disassembly: First, loosen the locking nut 5, then unscrew the clamping screw 6. The plunger 7 moves outward under the action of the hydraulic oil inside the compression chamber 12. The hydraulic oil in expansion chamber 1 3 and expansion chamber 2 10 flows back into the compression chamber 12 through oil passage 1 4 and oil passage 2 11. The pressure decreases, and the outer circles of expansion sleeve 1 2 and expansion sleeve 2 9 contract under internal stress, restoring their original dimensions. The outer circles of expansion sleeve 1 2 and expansion sleeve 2 9 then restore the clearance between the outer circles and the inner hole of the planetary carrier 13, allowing for non-destructive disassembly. This achieves the function of non-destructive disassembly.

Claims

1. A planetary gear transmission with built-in tensioning and positioning wheel and shaft structure, comprising a planetary carrier (13) and a positioning wheel and shaft assembly (16), characterized in that: The planetary carrier (13) is provided with a planetary gear bearing (14), and a planetary gear (15) is installed on the planetary gear bearing (14). The positioning wheel shaft assembly (16) passes through the planetary carrier (13), the planetary gear bearing (14), and the planetary gear (15) and is connected together to form a built-in tension positioning wheel shaft structure. The positioning wheel shaft assembly (16) includes a positioning wheel shaft (1), on which expansion sleeve one (2) and expansion sleeve two (9) are provided. Expansion oil chamber one (3) is provided on expansion sleeve one (2), and expansion oil chamber two (10) is provided on expansion sleeve two (9). The positioning wheel shaft assembly (16) also includes a compression oil chamber (12), an oil passage one (4), and an oil passage two (11).

2. The planetary gear transmission built-in tensioning and positioning wheel and shaft structure according to claim 1, characterized in that: The compression oil chamber (12) is provided with a seal (8) and a plunger (7). A clamping screw (6) is installed inside the compression oil chamber (12). A locking nut (5) is installed on the outer end of the clamping screw (6).

3. The planetary gear transmission built-in tensioning and positioning wheel and shaft structure according to claim 1, characterized in that: The compression oil chamber (12) is connected to the second oil passage (11), and the two ends of the second oil passage (11) are connected to the first expansion oil chamber (3) and the second expansion oil chamber (10) respectively.

4. The planetary gear transmission built-in tensioning and positioning wheel and shaft structure according to claim 1, characterized in that: The outer circles of the expansion sleeve 1 (2) and the expansion sleeve 2 (9) are fitted with the inner hole of the planet carrier (13) with a small clearance fit.

5. The planetary gear transmission built-in tensioning and positioning wheel and shaft structure according to claim 1, characterized in that: The compression chamber (12) is filled with hydraulic oil.

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