Planetary reducer

Abstract

The utility model provides a planetary reducer which comprises a planet gear, a sun gear and a gear ring, the planet gear is meshed with the sun gear, the planet gear is meshed with the gear ring, the sun gear is connected with the output end of a motor, and the sun gear can drive the planet gear to rotate when rotating; the planet wheel is arranged on the sun wheel, the planet bearing is arranged on the planet wheel, one end of the output shaft is connected with the planet wheel through the planet bearing, the axis of the output shaft and the axis of the sun wheel are located on the same straight line, and the planet wheel can drive the output shaft to rotate when moving. The speed reducer solves the problems that a common speed reducer cannot bear large axial force in the working process and is poor in impact resistance, and torque output is unstable due to the fact that the radial circle of the output shaft end jumps too large due to a cantilever beam supporting structure.

Description

Technical Field

[0001] This utility model relates to the field of planetary reducers, and in particular to a planetary reducer. Background Technology

[0002] Planetary gear reducers are a relatively new product developed in recent years. Compared with ordinary circular gear reducers, planetary gear reducers have advantages such as small size, light weight, large load capacity, high efficiency, and stable operation, and are widely used in aviation, aerospace, weaponry, shipbuilding, and engineering machinery. Currently, the military industry has increasingly higher requirements for the miniaturization and output stability of planetary gear reducers. In addition to being able to withstand large axial forces and resist impacts, planetary gear reducers also need to ensure stable torque output. However, traditional planetary gear reducers cannot withstand large axial forces and have poor impact resistance. Furthermore, their cantilever beam support structure leads to excessive radial runout at the output shaft end, causing unstable torque output and failing to meet the stringent requirements of the military industry. Utility Model Content

[0003] The purpose of this invention is to provide a planetary reducer that improves the stability of torque output.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a planetary reducer, comprising: planetary gears, a sun gear, and a ring gear, wherein the planetary gears mesh with the sun gear, the planetary gears mesh with the ring gear, the sun gear is connected to the output end of a motor, and the rotation of the sun gear can drive the planetary gears to rotate; an output shaft and planetary bearings, wherein the planetary bearings are disposed on the planetary gears, one end of the output shaft is connected to the planetary gears through the planetary bearings, the axis of the output shaft and the axis of the sun gear are located on the same straight line, and the movement of the planetary gears can drive the output shaft to rotate.

[0005] Furthermore, the reducer also includes a housing, the gear ring is disposed on the inner wall of the housing, and the other end of the output shaft extends from inside the housing to outside the housing.

[0006] Furthermore, the output shaft includes a main shaft, a transition section, and a connector connected in sequence. The transition section and the connector are both located inside the housing. A pin is provided on the planetary bearing. Both ends of the pin are connected to the connector. The end of the pin near the main shaft passes through the connector and is provided with a retaining ring. The connector is located between the planetary bearing and the retaining ring.

[0007] Furthermore, the planetary reducer also includes a first support bearing, which is disposed inside the housing and sleeved on the transition section, with the outer wall of the first support bearing connected to the inner wall of the housing.

[0008] Furthermore, the connector is provided with a connection hole, through which the sun gear is connected to the output end of the motor.

[0009] Furthermore, the planetary reducer also includes a second support bearing, a bearing housing is provided inside the motor housing, the motor housing is connected to the casing, the second support bearing is disposed inside the bearing housing, and the connecting seat is connected to the second support bearing.

[0010] Furthermore, the planetary reducer also includes a retaining ring, which is connected to the housing and is located on the side of the first support bearing away from the planetary gear.

[0011] Furthermore, the number of planetary gears is at least three.

[0012] Furthermore, both the planetary gear and the sun gear are made of 9Cr18 alloy.

[0013] Furthermore, the output shaft is made of 14Cr17Ni2 material.

[0014] Analysis shows that the present invention discloses a planetary reducer structure, which solves the problems of general reducers being unable to withstand large axial forces and having poor impact resistance, as well as the unstable torque output caused by excessive radial runout at the output shaft end due to the cantilever beam support structure. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0016] Figure 1 A schematic diagram of the structure of an embodiment of this utility model.

[0017] Figure 2 A structural cross-sectional view of a speed reducer according to an embodiment of this utility model;

[0018] Figure 3 A cross-sectional view of the internal structure of the reducer housing according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 Enlarged view of the structure at point I;

[0020] Figure 5 A structural cross-sectional view of the output shaft according to an embodiment of this utility model;

[0021] Figure 6 A schematic diagram of the output shaft of an embodiment of this utility model;

[0022] Figure 7 A structural diagram of the output shaft and planetary gears according to an embodiment of this utility model.

[0023] Figure 8 A structural cross-sectional view of the casing of an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 1. Output shaft; 2. Snap ring; 3. First support bearing; 4. Housing; 5. Second support bearing; 6. Main shaft; 7. Retaining ring; 8. Bearing washer; 9. Planetary gear; 10. Planetary bearing; 11. Pin; 12. Sun gear; 13. Motor; 14. Screw; 15. Transition section; 16. Connecting part. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0026] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” “third,” and “fourth,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of a single component.

[0028] like Figures 1-7As shown, according to an embodiment of the present invention, a planetary reducer is provided, comprising: planetary gears 9, a sun gear 12, and a ring gear. The planetary gears 9 mesh with the sun gear 12 and mesh with the ring gear. The sun gear 12 is connected to the output end of a motor 13. When the sun gear 12 rotates, it can drive the planetary gears 9 to rotate.

[0029] Planetary gear 9 meshes with sun gear 12, and planetary gear 9 also meshes with the gear ring on the inner wall of housing 4, forming a multi-stage reduction structure; sun gear 12 is connected to the output end of motor 13, and transmits power to output shaft 1 through the revolution and rotation of planetary gear 9.

[0030] The output shaft 1 and the planetary bearing 10 are mounted on the planetary gear 9. One end of the output shaft 1 is connected to the planetary gear 9 through the planetary bearing 10. The axis of the output shaft 1 and the axis of the sun gear 12 are on the same straight line. When the planetary gear 9 moves, it can drive the output shaft 1 to rotate.

[0031] The reducer also includes a housing 4, a gear ring is located on the inner wall of the housing 4, and the other end of the output shaft 1 extends out from the housing 4.

[0032] The output shaft 1 includes a main shaft 6, a transition section and a connector connected in sequence. The transition section and the connector are both located inside the housing 4. A pin 11 is provided on the planetary bearing 10. Both ends of the pin 11 are connected to the connector. The end of the pin 11 near the main shaft 6 passes through the connector and is provided with a retaining ring 7. The connector is located between the planetary bearing 10 and the retaining ring 7.

[0033] The aforementioned connector has a cavity in the middle and an opening on the outer wall of the connector. The planetary bearing 10 and the pin 11 are both located in the cavity. A part of the planetary gear 9 extends out of the connector and meshes with the gear ring. Both ends of the pin 11 pass through the cavity.

[0034] The planetary reducer also includes a retaining ring 2, which is connected to the housing 4 and is located on the side of the first support bearing 3 away from the planetary gear 9.

[0035] The pin 11 is made of zirconium oxide and has a groove for the retaining ring 2 at one end for mounting the retaining ring 2.

[0036] The output shaft 1 adopts a squirrel cage design, and its axis coincides with the axis of the sun gear 12 to ensure coaxial transmission. One end of the output shaft 1 is connected to the planet gear 9 through the planet bearing 10, and the other end extends to the outside of the housing 4 to form a power output end.

[0037] Angle contact bearings (first support bearing 3 and second support bearing 5) are respectively installed on both sides of the output shaft 1. Bidirectional axial fixation is achieved through preload, which improves the impact resistance.

[0038] The pin 11 and the planetary gear 9 bearing adopt an transition fit and are fixed by the retaining ring 7 to prevent radial displacement.

[0039] The planetary reducer also includes a first support bearing 3, which is located inside the housing 4 and is sleeved on the transition section. The outer wall of the first support bearing 3 is connected to the inner wall of the housing 4.

[0040] The connector has a connection hole, and the sun gear 12 is connected to the output end of the motor 13 through the motor 13 hole.

[0041] The axis of the connecting hole is in a straight line with the axis of the sun gear 12, and the motor 13 and the sun gear 12 are connected through the connecting hole.

[0042] The planetary reducer also includes a second support bearing 5. The motor 13 housing is provided with a bearing seat. The motor 13 housing is connected to the housing 4. The second support bearing 5 is located in the bearing seat. The connecting seat is connected to the second support bearing 5.

[0043] The housing of motor 13 is typically connected to the housing 4 by screws 14.

[0044] The number of planetary wheels 9 is at least 3.

[0045] Planetary gear 9 and sun gear 12 are both made of 9Cr18. Output shaft 1 is made of 14Cr17Ni2.

[0046] Planetary gear 9, sun gear 12 and gear ring are all made of 9Cr18 high-hardness alloy steel (HRC≥40) to enhance wear resistance; output shaft 1 is made of 14Cr17Ni2 stainless steel to balance strength and corrosion resistance.

[0047] In operation, motor 13 drives sun gear 12 to rotate, and planet gear 9 revolves around sun gear 12 under the constraint of ring gear, while simultaneously driving output shaft 1 to rotate via pin 11. Double angular contact bearings provide bidirectional support and suppress axial displacement; the squirrel-cage output shaft 1 structure distributes the load, reduces radial runout, and ultimately achieves stable torque output.

[0048] The planetary reducer mainly consists of a sun gear 12, planet gears 9, a gear ring, and an output shaft 1. It reduces the speed of the motor 13 to the required speed and obtains the desired higher output torque through the reduction ratio between the gears. After assembling the planetary reducer and adding lubricating grease, the sun gear 12 is mounted on the output shaft 1 of the motor. Simultaneously, the outer ring of the second support bearing 5 mates with the bearing housing of the motor 13. The motor is connected to the gear ring inside the reducer housing 4 via screws 14. Then, the motor is powered on, causing it to operate, and the reducer output shaft 1 to rotate, outputting speed and torque.

[0049] In summary, this utility model provides a planetary reducer structure that solves the problems of general reducers being unable to withstand large axial forces and having poor impact resistance, as well as the unstable torque output caused by excessive radial runout at the output shaft end due to the cantilever beam support structure.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A planetary reduction gear, characterized in that, The planetary reducer comprises a sun gear, a ring gear and a planet gear, the planet gear is engaged with the sun gear, the planet gear is engaged with the ring gear, the sun gear is connected with an output end of a motor, and the sun gear can drive the planet gear to rotate when rotating; The planetary reducer further comprises an output shaft and a planet bearing, the planet bearing is arranged on the planet gear, one end of the output shaft is connected with the planet gear through the planet bearing, an axis of the output shaft is located on the same straight line with an axis of the sun gear, and the planet gear can drive the output shaft to rotate when moving. The reducer further comprises a casing, the ring gear is arranged on an inner wall of the casing, and the other end of the output shaft extends out of the casing from the casing.

2. A planetary speed reducer according to claim 1, characterized in that The output shaft comprises a main shaft, a transition section and a connecting piece connected in sequence, the transition section and the connecting piece are located in the casing, a pin shaft is arranged on the planet bearing, both ends of the pin shaft are connected with the connecting piece, one end of the pin shaft close to the main shaft penetrates through the connecting piece and is provided with a check ring, and the connecting piece is located between the planet bearing and the check ring.

3. A planetary speed reducer according to claim 2, characterized in that The planetary reducer further comprises a first support bearing, the first support bearing is arranged in the casing, the first support bearing is sleeved on the transition section, and an outer wall of the first support bearing is connected with an inner wall of the casing.

4. A planetary speed reducer according to claim 3, characterized in that A connecting hole is arranged on the connecting piece, and the sun gear is connected with the output end of the motor through the connecting hole.

5. A planetary speed reducer according to claim 3, characterized in that The planetary reducer further comprises a second support bearing, a bearing seat is arranged in a shell of the motor, the shell of the motor is connected with the casing, the second support bearing is arranged in the bearing seat, and the connecting piece is connected with the second support bearing.

6. A planetary speed reducer according to claim 5, characterized in that The planetary reducer further comprises a clamping ring, the clamping ring is connected with the casing, and the clamping ring is located on a side of the first support bearing away from the planet gear.

7. A planetary speed reducer according to claim 4, characterized in that The number of the planet gears is at least 3.

8. A planetary speed reducer according to claim 1, characterized in that, The materials of the planet gears and the sun gear are 9Cr18.

9. A planetary speed reducer according to claim 1, characterized in that, The material of the output shaft is 14Cr17Ni2.

10. A planetary speed reducer according to claim 1, characterized in that, ​

Images