Structure for positioning planet gear

Abstract

The utility model relates to the technical field of planetary gears, and discloses a structure for positioning a planet gear, which comprises an input shaft and a primary planet carrier, the inner wall of the input shaft is fixedly connected with a primary sun gear, the outer wall of the input shaft is rotatably connected with a shell, the right side of the shell is fixedly provided with a second wear-resistant check ring, and the right side of the shell is provided with a second wear-resistant check ring. A first abrasion-resistant check ring is fixedly installed on the left side of the first-stage planet carrier, an inner gear ring is fixedly connected to the right side of the shell, the first-stage planet carrier is rotationally connected to the inner wall of the inner gear ring, and a plurality of outer-ring-free full complement cylindrical roller bearings are rotationally connected to the left side of the inner wall of the inner gear ring. According to the multi-stage speed reducer, the first-stage sun gear and the first-stage planet gear are meshed, the outer-ring-free full complement cylindrical roller bearings enable the planet gears to freely rotate between the first-stage planet carrier and the inner gear ring, multi-stage speed reduction can be achieved, different working rotating speed requirements are met, the structure is simple, and space is saved to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of planetary gears, in particular to a structure for positioning planetary gears. Background Art

[0002] A planetary gear usually refers to a structure in a planetary gear transmission system, which is used to transmit power and torque. It consists of a central gear (sun gear) and several planetary gears (planetary gears) surrounding it. The planetary gears are connected to the sun gear through a component called a planet carrier, and there is also an external gear (ring gear) on their shaft that meshes with it. This structure allows the planetary gears to transmit torque, and due to the movement of the planetary gears, the entire transmission system can also produce different speed ratios.

[0003] Planetary reducers are widely used in modern mechanical transmission, especially in low speed and high torque situations. Generally, a two-stage planetary gear reducer consists of a primary sun gear, a primary planetary gear, a primary planetary carrier, a primary internal gear ring and a secondary sun gear, a secondary planetary gear, a secondary planetary carrier, a secondary internal gear ring and rolling bearings.

[0004] At present, the positioning method of the planetary gear of the conventional planetary reducer is as follows: there are two bearings in the planetary gear, the bearings are installed on the pin shaft of the planetary carrier, and the two bearings are positioned with a retaining ring and a distance ring respectively. The outer end faces of the bearings are in contact with the positioning surfaces of the planetary carrier respectively. When the planetary reducer has a compact structure and the inner hole of the planetary gear is not suitable for cutting the retaining ring groove, the axial direction of the planetary gear cannot be fixed by the retaining ring, causing the planetary gear to be unable to mesh correctly with the sun gear and the inner gear ring, and the stability and effectiveness of the transmission cannot be guaranteed. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a structure for positioning the planetary gear, aiming to improve the problem that when the internal space of the planetary reducer is limited and the inner hole of the planetary gear is not suitable for cutting the retaining ring groove, the planetary gear cannot be fixed axially by the retaining ring, which causes the planetary gear to be unable to engage correctly with the sun gear and the inner ring gear.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a structure for positioning planetary gears, comprising an input shaft and a primary planetary carrier, the inner wall of the input shaft is fixedly connected with a primary sun gear, the outer wall of the input shaft is rotatably connected with a housing, a second wear-resistant retaining ring is fixedly installed on the right side of the housing, a first wear-resistant retaining ring is fixedly installed on the left side of the primary planetary carrier, an inner gear ring is fixedly connected on the right side of the housing, the inner wall of the inner gear ring is rotatably connected with the primary planetary carrier, a plurality of fully filled cylindrical roller bearings without outer rings are rotatably connected to the left side of the inner wall of the inner gear ring, the outer walls of the plurality of fully filled cylindrical roller bearings without outer rings are all meshedly connected with the primary planetary gears, the right ends of the plurality of fully filled cylindrical roller bearings without outer rings are all fixedly connected to the left side of the primary planetary carrier, the inner walls of the plurality of fully filled cylindrical roller bearings without outer rings are fixedly installed with retaining rings on pin shafts, a shaft retaining ring is fixedly installed on the right inner wall of the primary planetary carrier, and a secondary sun gear is fixedly installed on the inner wall of the shaft retaining ring.

[0007] As a further description of the above technical solution:

[0008] The outer wall of the shaft retaining ring is rotatably connected to the right inner wall of the first-stage planetary carrier.

[0009] As a further description of the above technical solution:

[0010] The first wear-resistant retaining ring is arranged between the left end of the outer wall of the first-stage planetary carrier and the inner wall of the inner gear ring.

[0011] As a further description of the above technical solution:

[0012] The second wear-resistant retaining ring is arranged on the right side of the outer shell and the left side of the outer wall of the inner gear ring.

[0013] As a further description of the above technical solution:

[0014] The shaft retaining ring, the first wear-resistant retaining ring and the second wear-resistant retaining ring are all axisymmetric structures.

[0015] As a further description of the above technical solution:

[0016] The outer walls of the primary sun gear, the secondary sun gear and the primary planetary gear are all designed to be smooth.

[0017] As a further description of the above technical solution:

[0018] The casting material of the primary sun gear, the secondary sun gear and the primary planetary gear is made of cast iron.

[0019] As a further description of the above technical solution:

[0020] The interior of the shell is provided with a hollow design.

[0021] The utility model has the following beneficial effects:

[0022] In the utility model, through the meshing of the primary sun gear and the primary planetary gear, the non-outer ring fully loaded cylindrical roller bearing enables the planetary gear to rotate freely between the primary planetary carrier and the inner gear ring. The primary sun gear and the secondary sun gear and their respective planetary gears can achieve multi-stage deceleration, thereby meeting different working speed requirements. The planetary gear positioning method uses a wear-resistant retaining ring fixed on the outer shell and the planetary carrier to position the axial movement of the planetary gear, avoiding the situation where the planetary gear cannot be positioned and the planetary gear cannot be properly meshed with the sun gear and the inner gear ring, making the force movement of the planetary gear more reasonable. The utility model has a simple structure and saves space to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a cross-sectional view of a structure for positioning a planetary gear.

[0024] Legend:

[0025] 1. Internal gear ring; 2. Primary planet carrier; 3. Secondary sun gear; 4. Shaft retaining ring; 5. First wear-resistant retaining ring; 6. Second wear-resistant retaining ring; 7. Primary sun gear; 8. Input shaft; 9. Housing; 10. Retaining ring on pin shaft; 11. Full complement cylindrical roller bearing without outer ring; 12. Primary planet gear. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Reference Figure 1, an embodiment provided by the utility model: a structure for positioning planetary gears, comprising an input shaft 8 and a primary planetary carrier 2, the inner wall of the input shaft 8 is fixedly connected with a primary sun gear 7, the outer wall of the input shaft 8 is rotatably connected with a housing 9, a second wear-resistant retaining ring 6 is fixedly installed on the right side of the housing 9, a first wear-resistant retaining ring 5 is fixedly installed on the left side of the primary planetary carrier 2, an inner gear ring 1 is fixedly connected on the right side of the housing 9, the inner wall of the inner gear ring 1 is rotatably connected with the primary planetary carrier 2, a plurality of cylindrical roller bearings 11 without outer rings are rotatably connected to the inner wall of the inner gear ring 1 on the left side, the outer walls of the plurality of cylindrical roller bearings 11 without outer rings are all meshedly connected with a primary planetary gear 12, the right ends of the plurality of cylindrical roller bearings 11 without outer rings are all fixedly connected to the left side of the primary planetary carrier 2, the inner walls of the plurality of cylindrical roller bearings 11 without outer rings are fixedly installed with a pin shaft retaining ring 10, a shaft retaining ring 4 is fixedly installed on the right inner wall of the primary planetary carrier 2, and a secondary sun gear 3 is fixedly installed on the inner wall of the shaft retaining ring 4;

[0028] Specifically, the meshing of the first-stage sun gear 7 and the first-stage planetary gear 12 realizes the transmission effect. The fully loaded cylindrical roller bearing 11 without an outer ring enables the planetary gear to rotate freely between the first-stage planetary carrier 2 and the inner gear ring 1, thereby realizing power transmission and speed change. The first-stage sun gear 7 and the second-stage sun gear 3 and their respective planetary gears can realize multi-stage deceleration to meet different working speed requirements. The setting of the first wear-resistant retaining ring 5 and the second wear-resistant retaining ring 6 can reduce the friction in the structure, protect the components from wear, and improve the durability and stability of the structure. The outer shell 9 provides support and positioning for the entire planetary gear structure, so that the entire transmission system can work stably. The setting of the retaining ring 10 on the pin shaft and the retaining ring 4 for the shaft can effectively prevent the planetary gear and the sun gear from moving in the axial direction.

[0029] Reference Figure 1 The outer wall of the shaft retaining ring 4 is rotatably connected to the right inner wall of the primary planet carrier 2; the first wear-resistant retaining ring 5 is arranged between the left end of the outer wall of the primary planet carrier 2 and the inner wall of the inner gear ring 1; the second wear-resistant retaining ring 6 is arranged on the right side of the housing 9 and the left side of the outer wall of the inner gear ring 1;

[0030] Specifically, the shaft retaining ring 4 is used to limit the movement of the positioning shaft to ensure that the shaft does not deviate from the predetermined track or path when rotating. The shaft retaining ring 4 plays the role of guiding, supporting and limiting axial movement. The wear-resistant retaining ring is used to reduce friction and wear, and is used to protect the primary planetary carrier 2 and the inner gear ring 1 to extend their service life. Similar to the first wear-resistant retaining ring 5, the second wear-resistant retaining ring 6 is also used to reduce friction and wear.

[0031] Reference Figure 1 The shaft retaining ring 4, the first wear-resistant retaining ring 5 and the second wear-resistant retaining ring 6 are all axisymmetric structures; the interior of the housing 9 is hollow;

[0032] Specifically, the shaft retaining ring 4, the first wear-resistant retaining ring 5 and the second wear-resistant retaining ring 6 are designed as an axisymmetric structure, which can enhance the stability and balance of these components during operation and reduce deformation or damage caused by uneven force. The axisymmetric structure can also ensure that the force distribution of each component is more uniform under rotation or dynamic load, thereby improving the reliability and life of the entire device. The hollow design inside the shell 9 can effectively reduce the weight of the entire device. At the same time, the hollow design can also increase the heat dissipation area of ​​the shell 9, which is conducive to the dissipation of internal heat and prevents overheating from affecting equipment performance or causing component damage.

[0033] Reference Figure 1 The outer walls of the primary sun gear 7, the secondary sun gear 3 and the primary planetary gear 12 are all designed to be smooth; the casting materials of the primary sun gear 7, the secondary sun gear 3 and the primary planetary gear 12 are made of cast iron;

[0034] Specifically, the smooth design can reduce friction with other gears or bearings during operation, thereby improving efficiency and reducing wear. The reduced friction and impact will also reduce the noise during gear operation, improve the overall smoothness of operation, and extend the service life. Cast iron material has high strength and durability, and can withstand the stress and load generated during gear operation. It has a lower cost than other high-performance materials, so using cast iron to manufacture gears can reduce manufacturing costs.

[0035] Working principle: The meshing of the primary sun gear 7 and the primary planetary gear 12 realizes the transmission effect. The cylindrical roller bearing 11 without outer ring enables the planetary gear to rotate freely between the primary planetary carrier 2 and the inner gear ring 1 to realize power transmission and speed change. The primary sun gear 7 and the secondary sun gear 3 and their respective planetary gears can realize multi-stage deceleration to meet different working speed requirements. The setting of the first wear-resistant retaining ring 5 and the second wear-resistant retaining ring 6 can reduce the friction in the structure, protect the components from wear, and improve the durability and stability of the structure. The housing 9 provides support and positioning for the entire planetary gear structure, so that the entire transmission system can work stably. The setting of the retaining ring 10 on the pin shaft and the shaft retaining ring 4 can effectively prevent the planetary gear and the sun gear from moving in the axial direction, thereby ensuring the stability of the transmission. Since the planetary gear positioning method adopts the wear-resistant retaining ring fixed on the housing 9 and the planetary carrier to position the axial movement of the planetary gear, it avoids the situation that the planetary gear cannot be positioned and causes the planetary gear to fail to mesh correctly with the sun gear and the inner gear ring 1, making the force movement of the planetary gear more reasonable.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for positioning a planetary gear, comprising an input shaft (8) and a primary planet carrier (2), characterized in that: The inner wall of the input shaft (8) is fixedly connected to a primary sun gear (7), the outer wall of the input shaft (8) is rotatably connected to a housing (9), a second wear-resistant retaining ring (6) is fixedly mounted on the right side of the housing (9), a first wear-resistant retaining ring (5) is fixedly mounted on the left side of the primary planet carrier (2), an inner gear ring (1) is fixedly connected to the right side of the housing (9), the inner wall of the inner gear ring (1) is rotatably connected to the primary planet carrier (2), and a plurality of cylindrical roller shafts without outer rings and fully loaded are rotatably connected to the left side of the inner wall of the inner gear ring (1). The outer walls of the plurality of cylindrical roller bearings (11) without outer rings are meshedly connected with a first-stage planetary gear (12), the right ends of the plurality of cylindrical roller bearings (11) without outer rings are fixedly connected to the left side of the first-stage planetary carrier (2), the inner walls of the plurality of cylindrical roller bearings (11) without outer rings are fixedly mounted with a pin upper retaining ring (10), the right inner wall of the first-stage planetary carrier (2) is fixedly mounted with a shaft retaining ring (4), and the inner wall of the shaft retaining ring (4) is fixedly mounted with a second-stage sun gear (3).

2. A structure for positioning a planetary gear according to claim 1, characterized in that: The outer wall of the shaft retaining ring (4) is rotatably connected to the right inner wall of the first-stage planet carrier (2).

3. The structure for positioning a planetary gear according to claim 1, characterized in that: The first wear-resistant retaining ring (5) is arranged between the left end of the outer wall of the first-stage planet carrier (2) and the inner wall of the inner gear ring (1).

4. The structure for positioning a planetary gear according to claim 1, characterized in that: The second wear-resistant retaining ring (6) is arranged on the right side of the outer shell (9) and on the left side of the outer wall of the inner gear ring (1).

5. The structure for positioning a planetary gear according to claim 1, characterized in that: The shaft retaining ring (4), the first wear-resistant retaining ring (5) and the second wear-resistant retaining ring (6) are all of axisymmetric structure.

6. The structure for positioning a planetary gear according to claim 1, characterized in that: The outer walls of the primary sun gear (7), the secondary sun gear (3) and the primary planetary gear (12) are all designed to be smooth.

7. The structure for positioning a planetary gear according to claim 1, characterized in that: The casting material of the primary sun gear (7), the secondary sun gear (3) and the primary planetary gear (12) is made of cast iron.

8. The structure for positioning a planetary gear according to claim 1, characterized in that: The interior of the housing (9) is hollow.

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