A primary planetary gear reducer

Abstract

The utility model provides a kind of primary planetary gear reducer, belong to the technical field of speed reducer.It solves the problem of unstable connection of planet carrier in prior art.The utility model includes box, front side machine cover, rear side machine cover, planetary gear, sun gear, inner ring gear, planet carrier assembly, input shaft and output shaft, and front frame body and rear frame body are overall inverted triangle structure, and connecting column is formed in the front side of rear frame body, and connecting groove that is compatible with connecting column is set on the rear end face of front frame body, and a plurality of first connecting holes are set in connecting groove, and a plurality of second connecting holes and third connecting holes are set in rear frame body, and second connecting hole is coaxial with first connecting hole and is set through connecting column, and front gasket and front fixed bolt are set on the side of front frame body, and front fixed bolt is set through front gasket and is fixedly connected by first connecting hole and second connecting hole with rear frame body and rear frame body.The utility model has the advantages of higher connection stability, simplified structure and avoiding redundant connecting piece.

Description

Technical Field

[0001] This utility model belongs to the field of speed reducer technology and relates to a single-stage planetary gear reducer. Background Technology

[0002] A single-stage planetary gear reducer is a highly efficient and compact transmission device that combines the advantages of high efficiency, high load capacity, and small size. It is widely used in automotive transmissions, servo motor drives, construction machinery, and other applications, making it an ideal choice for balancing performance and space requirements.

[0003] Chinese patent publication number CN208831603U discloses a planetary gear reducer, including a housing, a sun gear assembly, a planetary gear assembly, a planet carrier, an internal gear ring assembly, an output assembly, and an input shaft. The sun gear assembly includes a first sun gear and a second sun gear with different pitch circle diameters. The first sun gear and the second sun gear are arranged side by side on the same gear shaft. The first planetary gear and the second planetary gear are connected to the planetary gear shaft through bearings. The planetary gear shaft is fixedly connected to the planet carrier. The output assembly includes an output shaft and an output hollow shaft. The output shaft is fixedly connected to the planet carrier. The output hollow shaft is fixedly connected to the second internal gear ring and is sleeved on the outer surface of the output shaft.

[0004] In the planetary gear reducer provided by this patent, the planet carrier does not have a structure for fixing it, which can easily cause instability of the planet carrier in actual use. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a single-stage planetary gear reducer.

[0006] The objective of this utility model can be achieved through the following technical solution: A single-stage planetary gear reducer includes a housing, a front cover, a rear cover, planet gears, a sun gear, an internal gear ring, a planet carrier assembly, an input shaft, and an output shaft. The front cover and the rear cover are respectively fixedly installed on the front and rear sides of the housing. The planetary gear assembly and the planet carrier assembly are installed in the cavity formed inside the housing, the front cover, and the rear cover. The planet carrier assembly includes a front carrier body and a rear carrier body. The front carrier body and the rear carrier body are generally inverted triangular in shape. A connecting post is formed on the front side of the rear carrier body, and a corresponding connecting post is formed on the rear end face of the front carrier body. The system includes a connecting groove with several first connecting holes, and a rear frame with several second and third connecting holes. The second connecting holes pass through the connecting column and are coaxially arranged with the first connecting holes. A front washer and a front fixing bolt are provided on one side of the front frame. The front fixing bolt passes through the front washer and fixes the front frame and the rear frame through the first and second connecting holes. The third connecting hole is located inside the second connecting hole and passes through the rear frame. Both the front and rear frames have mounting holes, in which cylindrical roller bearings are installed. Both ends of the planetary gear are connected to the cylindrical roller bearings.

[0007] In the aforementioned single-stage planetary gear reducer, a limiting ring is formed inside the housing, the internal gear ring is installed outside the planetary gears and meshes with the planetary gears, and the side end face of the internal gear ring is in contact with the limiting ring.

[0008] In the aforementioned single-stage planetary gear reducer, the output shaft end is disc-shaped and fits against the outer end face of the rear frame. The output shaft end is provided with a fourth connecting hole, which is coaxial with the third connecting hole. A rear washer and a rear fixing bolt are provided on the outer side of the rear frame. The rear fixing bolt passes through the rear washer and fixes the output shaft and the rear frame through the fourth connecting hole and the third connecting hole.

[0009] In one of the aforementioned single-stage planetary gear reducers, a first elastic retaining ring is provided on the outer side of the cylindrical roller bearing.

[0010] In the aforementioned single-stage planetary gear reducer, the sun gear is located at the center of the planet gears and meshes with them. The end of the input shaft is gear-shaped, and the end of the output shaft is coaxial with the sun gear. A floating gear sleeve is fitted around the end of the output shaft and the sun gear, and the floating gear sleeve meshes with the end of the output shaft and the sun gear.

[0011] In the aforementioned single-stage planetary gear reducer, a second elastic retaining ring is provided inside the floating gear sleeve, and the second elastic retaining ring is located between the output shaft end and the sun gear.

[0012] Compared with the prior art, the single-stage planetary gear reducer provided by this utility model has the following advantages: 1. The front and rear carrier bodies of the planetary carrier assembly adopt an interlocking structure of connecting columns and connecting slots. The second connecting hole penetrating the connecting column is coaxially designed with the first connecting hole in the connecting slot of the front carrier body. Rigid connection is achieved through the front fixing bolt, which greatly improves the connection strength between the two and effectively resists the radial and axial impact forces generated during planetary gear transmission; 2. The internal gear ring is axially positioned through the limiting ring in the housing. Stable installation is possible without additional fixing structures, reducing the number of parts and shortening the axial dimension; 3. The output shaft and the rear carrier body are connected by end face fitting and rear fixing bolts. The coaxial design of the fourth connecting hole and the third connecting hole ensures the connection accuracy. At the same time, the disc-shaped structure at the end of the output shaft is directly fitted with the rear carrier body, simplifying the power transmission path and avoiding redundant connecting parts occupying space. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal exploded structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the planetary carrier assembly structure.

[0016] In the diagram: 1. Housing; 110. Limiting ring; 2. Front cover; 3. Rear cover; 4. Planetary gear; 5. Sun gear; 6. Internal gear ring; 7. Planetary carrier assembly; 71. Front carrier body; 711. Connecting groove; 712. First connecting hole; 72. Rear carrier body; 721. Connecting column; 722. Second connecting hole; 723. Third connecting hole; 73. Mounting hole; 8. Input shaft; 9. Output shaft; 91. Fourth connecting hole; 10. Front gasket; 11. Front fixing bolt; 12. Cylindrical roller bearing; 13. Rear gasket; 14. Rear fixing bolt; 15. First elastic retaining ring; 16. Floating gear sleeve; 17. Second elastic retaining ring. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] like Figures 1 to 3 As shown, this embodiment includes a housing 1, a front cover 2, a rear cover 3, planetary gears 4, a sun gear 5, an internal gear ring 6, a planetary carrier assembly 7, an input shaft 8, and an output shaft 9. The front cover 2 and the rear cover 3 are respectively fixed to the front and rear sides of the housing 1 by bolts, forming a closed cavity structure. The planetary gears 4, the sun gear 5, the internal gear ring 6, and the planetary carrier assembly 7 are all installed in this cavity, constituting a complete planetary gear transmission system.

[0019] like Figures 1 to 3 As shown, the planetary carrier assembly 7 includes a front carrier body 71 and a rear carrier body 72. The front carrier body 71 and the rear carrier body 72 are generally inverted triangular in shape. The front side of the rear carrier body 72 extends to form a connecting post 721. A connecting groove 711 adapted to the connecting post 721 is correspondingly opened on the rear end face of the front carrier body 71. A plurality of first connecting holes 712 are evenly opened in the connecting groove 711 along the circumference. A plurality of second connecting holes 722 and third connecting holes 723 are correspondingly opened in the rear carrier body 72. The second connecting holes 722 and third connecting holes 723 are respectively opened in the rear carrier body 72. Hole 722 passes through connecting post 721 and is coaxially arranged with first connecting hole 712. In actual installation, connecting post 721 is inserted into connecting groove 711. Front gasket 10 and front fixing bolt 11 are provided on the outside of front frame 71. After the front fixing bolt 11 passes through front gasket 10, it firmly fixes front frame 71 and rear frame 72 through first connecting hole 712 and second connecting hole 722, forming a rigid connection structure, which effectively resists the radial and axial impact forces generated during planetary gear transmission.

[0020] like Figures 1 to 3 As shown, the third connecting hole 723 is located inside the second connecting hole 722 and passes through the rear frame 72. It is used to connect the output shaft 9. Both the front frame 71 and the rear frame 72 have mounting holes 73. Cylindrical roller bearings 12 are installed in the mounting holes 73. The two ends of the planetary gear 4 are respectively connected to the corresponding cylindrical roller bearings 12 to achieve stable rotational support of the planetary gear 4.

[0021] To elaborate further, such as Figures 1 to 3 As shown, a first elastic retaining ring 15 is provided on the outer side of the cylindrical roller bearing 12 for axial positioning of the cylindrical roller bearing 12 and to prevent the cylindrical roller bearing 12 from moving.

[0022] like Figures 1 to 3 As shown, the end of the output shaft 9 is designed as a disc-shaped structure and fits tightly against the outer end face of the rear frame 72. The end of the output shaft 9 is provided with a fourth connecting hole 91, which is coaxially arranged with the third connecting hole 723. The rear frame 72 is provided with a rear washer 13 and a rear fixing bolt 14. The rear fixing bolt 14 passes through the rear washer 13 and is fixedly connected to the output shaft 9 and the rear frame 72 through the fourth connecting hole 91 and the third connecting hole 723, ensuring connection accuracy and power transmission efficiency.

[0023] To elaborate further, such as Figures 1 to 3 As shown, a limiting ring 110 is formed inside the housing 1. The internal gear ring 6 is installed outside the planetary gear 4 and meshes with the planetary gear 4. The side end face of the internal gear ring 6 is in contact with the limiting ring 110. The axial positioning of the internal gear ring 6 is achieved through the limiting ring 110. No additional fixing structure is required, which reduces the number of parts and shortens the axial dimension.

[0024] like Figures 1 to 3 As shown, the sun gear 5 is located at the center of the planet gear 4 and meshes with the planet gear 4. The end of the input shaft 8 is gear-shaped and is coaxial with the sun gear 5. The end of the output shaft 9 and the outside of the sun gear 5 are fitted with floating gear sleeves 16. The floating gear sleeves 16 are meshed with the end of the output shaft 8 and the sun gear 5 to achieve smooth power transmission.

[0025] To elaborate further, such as Figures 1 to 3 As shown, a second elastic retaining ring 17 is provided inside the floating gear sleeve 16. The second elastic retaining ring 17 is located between the end of the output shaft 8 and the sun gear 5, and is used for axial positioning and to prevent the floating gear sleeve 16 from moving.

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0027] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A single-stage planetary gear reducer, comprising a housing (1), a front cover (2), a rear cover (3), planetary gears (4), a sun gear (5), an internal gear ring (6), a planetary carrier assembly (7), an input shaft (8), and an output shaft (9), wherein the front cover (2) and the rear cover (3) are respectively fixedly installed on the front and rear sides of the housing (1), and the planetary gears (4) and the planetary carrier assembly (7) are installed in cavities formed inside the housing (1), the front cover (2), and the rear cover (3), characterized in that: The planetary carrier assembly (7) includes a front carrier body (71) and a rear carrier body (72). The front carrier body (71) and the rear carrier body (72) are generally in the shape of an inverted triangle. A connecting post (721) is formed on the front side of the rear carrier body (72). A connecting groove (711) adapted to the connecting post (721) is opened on the rear end face of the front carrier body (71). A plurality of first connecting holes (712) are opened in the connecting groove (711). A plurality of second connecting holes (722) and third connecting holes (723) are opened in the rear carrier body (72). The second connecting holes (722) penetrate the connecting post (721) and are coaxial with the first connecting holes (712). The front frame (71) is provided with a front gasket (10) and a front fixing bolt (11) on one side. The front fixing bolt (11) passes through the front gasket (10) and fixes the front frame (71) and the rear frame (72) through the first connecting hole (712) and the second connecting hole (722). The third connecting hole (723) is located inside the second connecting hole (722) and passes through the rear frame (72). The front frame (71) and the rear frame (72) are provided with mounting holes (73). Cylindrical roller bearings (12) are installed in the mounting holes (73). The two ends of the planetary gear (4) are connected to the cylindrical roller bearings (12).

2. The single-stage planetary gear reducer according to claim 1, characterized in that: A limiting ring (110) is formed inside the housing (1). The internal gear ring (6) is installed outside the planetary gear (4) and meshes with the planetary gear (4). The side end face of the internal gear ring (6) is in contact with the limiting ring (110).

3. A single-stage planetary gear reducer according to claim 1, characterized in that: The output shaft (9) has a disc-shaped end that fits against the outer end face of the rear frame (72). The output shaft (9) has a fourth connecting hole (91) at its end. The fourth connecting hole (91) is coaxially arranged with the third connecting hole (723). The rear frame (72) has a rear washer (13) and a rear fixing bolt (14) on its outer side. The rear fixing bolt (14) passes through the rear washer (13) and fixes the output shaft (9) and the rear frame (72) through the fourth connecting hole (91) and the third connecting hole (723).

4. A single-stage planetary gear reducer according to claim 1, characterized in that: The cylindrical roller bearing (12) is provided with a first elastic retaining ring (15) on its outer side.

5. A single-stage planetary gear reducer according to claim 1, characterized in that: The sun gear (5) is located at the center of the planet gear (4) and meshes with the planet gear (4). The end of the input shaft (8) is gear-shaped and the end of the output shaft (9) is coaxial with the sun gear (5). A floating gear sleeve (16) is fitted around the end of the output shaft (9) and the outside of the sun gear (5). The floating gear sleeve (16) meshes with the end of the output shaft (9) and the sun gear (5).

6. A single-stage planetary gear reducer according to claim 5, characterized in that: The floating gear sleeve (16) is provided with a second elastic retaining ring (17) inside, which is located between the end of the output shaft (9) and the sun gear (5).

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