Gearbox

Abstract

The utility model provides a gearbox, and belongs to the technical field of gearboxes. The problems that in the prior art, a planetary gear is low in transmission efficiency and prone to abrasion are solved. The speed reducer comprises a front shell, a rear shell, a planetary gear assembly, an oil nozzle assembly, an input shaft and an output shaft, the planetary gear assembly comprises an outer gear ring, a planetary gear, a sun gear and a planet carrier, inner connecting teeth are formed in the outer gear ring, the planetary gear is connected with the inner connecting teeth in a meshed mode, and a bearing hole is formed in the planetary gear. A connecting hole is formed in the end of the planet carrier, a gear shaft is arranged in the double-row ball bearing in a penetrating mode, one end of the gear shaft penetrates through the connecting hole, the end, extending out of one side of the planet carrier, of the gear shaft is sleeved with a fixing plate, the fixing plate is attached to one side of the planet carrier, and a fixing hole is formed in the fixing plate; a plurality of first fastening bolts are fixedly installed in the fixing holes, penetrate through the fixing holes and are fixedly connected with the planet carrier and the gear shaft. The planetary gear transmission device has the advantages of being good in planetary gear transmission efficiency, not prone to abrasion and good in lubricating and cooling effect.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology and relates to a gearbox. Background Technology

[0002] A planetary gearbox is a transmission device with a planetary gear mechanism at its core. It is widely used in automobiles, construction machinery and other fields. It can complete complex power transmission in a limited space and is a key component of automatic transmissions, hybrid systems and so on.

[0003] Chinese patent publication number CN217301461U discloses a planetary gear for an automotive transmission, including an external gear ring and an internal gear block. The external gear ring has an internal connecting gear inside, and a second slot is formed on the inner surface of the external gear ring. An internal gear arc is formed on the inner side of the external gear ring, and an internal gear block is integrally formed on the inner surface of the internal gear arc. A first slot is formed at one end of the internal gear arc, and a slot is formed at the other end of the internal gear arc. A limit block is provided inside the slot at the other end of the internal gear arc.

[0004] As can be seen from the specification and drawings, in the planetary gear of the automobile transmission provided by this patent, the inner connecting gear only has a shaft hole in the center and no hole for placing the bearing. Without the bearing, the inner connecting gear and the shaft have sliding friction, which leads to reduced transmission efficiency and the inner connecting gear is prone to wear and has a short service life. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a gearbox.

[0006] The objective of this utility model can be achieved through the following technical solution: A gearbox includes a front housing, a rear housing, a planetary gear assembly, a fuel injector assembly, an input shaft, and an output shaft. The planetary gear assembly and the fuel injector assembly are installed inside the front housing and the rear housing. The planetary gear assembly includes an external gear ring, planetary gears, a sun gear, and a planet carrier. The external gear ring has internal connecting teeth, and the planetary gears mesh with the internal connecting teeth. The planetary gears have bearing holes inside, and double-row ball bearings are installed in the bearing holes. The planet carrier has a connecting hole at its end. A gear shaft passes through the double-row ball bearings, and one end of the gear shaft passes through the connecting hole. A fixing plate is fitted onto the end of the gear shaft extending out of the planet carrier. The fixing plate fits against one side of the planet carrier, and a fixing hole is provided in the fixing plate. A plurality of first fastening bolts are fixedly installed in the fixing hole. The first fastening bolts pass through the fixing hole and are fixedly connected to the planet carrier and the gear shaft. The sun gear meshes with the inner side of the planetary gears, and a connecting cylinder is formed at one end of the sun gear.

[0007] In one of the aforementioned gearboxes, the fuel injector assembly includes a fuel injector seat and a fuel injector rod. The fuel injector seat is connected to a connecting cylinder, and the fuel injector rod is fixedly installed on both sides of the fuel injector seat and is internally connected to the fuel injector seat. One end of the input shaft is connected to the fuel injector seat.

[0008] In one of the aforementioned gearboxes, a mounting platform is formed at the center of the planetary carrier. The mounting platform has several bolt holes, which are stepped and have an inner diameter larger than an outer diameter. The mounting platform fits against the end face of the output shaft. A second fastening bolt passes through the bolt holes, and one end of the second fastening bolt extending out of the bolt hole is fixedly connected to the output shaft.

[0009] In one of the aforementioned gearboxes, an input shaft bearing is fitted onto the outside of the input shaft, and an output shaft bearing is fitted onto the outside of the output shaft.

[0010] In one of the aforementioned gearboxes, connecting rings are formed on both sides of the external gear ring, and the front housing and the rear housing are respectively connected to the connecting rings on both sides of the external gear ring.

[0011] Compared with the prior art, the gearbox provided by this utility model has the following beneficial effects: 1. The planetary gear has a bearing hole and a ball bearing is set inside, so that rolling friction is formed between the planetary gear and the gear shaft. The ball bearing transmits the radial load of the planetary gear to the gear shaft evenly through the rolling elements, avoiding the local stress concentration and severe wear caused by the direct contact between the inner hole of the gear and the shaft in the bearingless structure; 2. The gear shaft is fixed to the planetary carrier by the fixing plate and the first fastening bolt to form a rigid connection structure, which disperses the load borne by the planetary gear, avoids local stress concentration, and improves the impact resistance of the component; 3. The oil injector assembly is connected to the connecting cylinder of the sun gear through the oil injector seat, and the oil injector rod can directly spray lubricating oil into the planetary gear assembly to achieve precise lubrication and cooling. Attached Figure Description

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

[0013] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0014] In the diagram: 1. Front housing; 2. Rear housing; 3. Planetary gear assembly; 31. External gear ring; 311. Internal connecting gear; 312. Connecting ring body; 32. Planetary gear; 321. Bearing hole; 33. Sun gear; 331. Connecting cylinder; 34. Planetary carrier; 341. Connecting hole; 342. Mounting platform; 343. Bolt hole; 35. Double row ball bearing; 36. Gear shaft; 37. Fixing plate; 371. Fixing hole; 4. Injector assembly; 41. Injector seat; 42. Injector rod; 5. Input shaft; 51. Input shaft bearing; 6. Output shaft; 61. Output shaft bearing; 7. First fastening bolt; 8. Second fastening bolt. Detailed Implementation

[0015] 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.

[0016] like Figures 1 to 2 As shown, this embodiment consists of a front housing 1, a rear housing 2, a planetary gear assembly 3, a fuel injector assembly 4, an input shaft 5, and an output shaft 6. The front housing 1 and the rear housing 2 provide a stable mounting space for the internal components. The planetary gear assembly 3 and the fuel injector assembly 4 are installed inside the front housing 1 and the rear housing 2 to realize the functions of power transmission and lubrication and cooling.

[0017] like Figures 1 to 2 As shown, the planetary gear assembly 3 includes an external gear ring 31, planetary gears 32, a sun gear 33, and a planet carrier 34. The external gear ring 31 has internal connecting teeth, which mesh with the planetary gears 32. The planetary gears 32 have bearing holes 321 inside, and double-row ball bearings 35 are installed in these holes. The double-row ball bearings 35 effectively reduce friction during planetary gear rotation, improving transmission efficiency and service life. The planet carrier 34 has connecting holes 341 at its ends, and a gear shaft 36 passes through the double-row ball bearings 35. One end of the gear shaft 36 passes through the connecting hole 341 to provide support and positioning for the planetary gear 32. The end of the gear shaft 36 extending out of the planet carrier 34 is fitted with a fixing plate 37. The fixing plate 37 fits against one side of the planet carrier 34. The fixing plate 37 has a fixing hole 371. Several first fastening bolts 7 are fixedly installed in the fixing hole 371. The first fastening bolts 7 pass through the fixing hole 371 and are fixedly connected to the planet carrier 34 and the gear shaft 36, so that the gear shaft 36 and the planet carrier 34 form a stable rigid connection, distribute the load, and avoid local stress concentration.

[0018] like Figures 1 to 2As shown, the sun gear 33 meshes with the planetary gear 32 on its inner side. One end of the sun gear 33 has a connecting cylinder 331 for connecting with the fuel injector assembly 4. The fuel injector assembly 4 includes a fuel injector seat 41 and a fuel injector rod 42. The fuel injector seat 41 is connected to the connecting cylinder 331, and the fuel injector rod 42 is fixedly installed on both sides of the fuel injector seat 41. The fuel injector rod 42 and the fuel injector seat 41 are internally connected. One end of the input shaft 5 is connected to the fuel injector seat 41. The fuel injector assembly 4 can directly spray lubricating oil into the channel inside the connecting cylinder 331 of the sun gear 33 through the fuel injector rod 42 to achieve precise lubrication and cooling, and ensure the stability of the assembly when it is running at high speed.

[0019] To elaborate further, such as Figures 1 to 2 As shown, a mounting platform 342 is formed at the center of the planetary carrier 34. Several bolt holes 343 are provided in the mounting platform 342. The bolt holes 343 are stepped and the inner diameter of the bolt holes 343 is larger than the outer diameter, which facilitates the installation and positioning of the second fastening bolt 8. The mounting platform 342 is in contact with the end face of the output shaft 6. The second fastening bolt 8 is inserted into the bolt holes 343. One end of the second fastening bolt 8 that extends out of the bolt holes 343 is fixedly connected to the output shaft 6, so that the planetary carrier 34 and the output shaft 6 are tightly connected, ensuring that the power can be efficiently transmitted to the output shaft 6.

[0020] To elaborate further, such as Figures 1 to 2 As shown, an input shaft bearing 51 is sleeved on the outside of the input shaft 5, and an output shaft bearing 61 is sleeved on the outside of the output shaft 6. The input shaft bearing 51 and the output shaft bearing 61 provide support for the rotation of the input shaft 5 and the output shaft 6, respectively, reducing frictional resistance during rotation and ensuring the smooth operation of shaft parts.

[0021] To elaborate further, such as Figures 1 to 2 As shown, connecting rings 312 are formed on both sides of the external gear ring 31. The front housing 1 and the rear housing 2 are respectively connected to the connecting rings 312 on both sides of the gear ring, so that the external gear ring 31 and the front and rear housings form a stable integral structure, improving the overall rigidity and sealing performance of this embodiment.

[0022] 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.

[0023] 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 gearbox, comprising a front housing (1), a rear housing (2), a planetary gear (32) assembly (3), a fuel injector assembly (4), an input shaft (5), and an output shaft (6), characterized in that: The planetary gear (32) assembly (3) and the fuel injector assembly (4) are installed inside the front housing (1) and the rear housing (2). The planetary gear (32) assembly (3) includes an external gear ring (31), planetary gears (32), a sun gear (33), and a planet carrier (34). The external gear ring (31) has internal connecting teeth (311) formed inside, and the planetary gears (32) mesh with the internal connecting teeth (311). The planetary gears (32) have bearing holes (321) inside, and double-row ball bearings (35) are provided in the bearing holes (321). The planet carrier (34) has connecting holes (341) at its end, and the double-row ball bearings (35) have connecting holes (341) inside. A gear shaft (36) is provided, and one end of the gear shaft (36) passes through a connecting hole (341). A fixing plate (37) is fitted on the end of the gear shaft (36) that extends out of the planet carrier (34). The fixing plate (37) is in contact with one side of the planet carrier (34) and a fixing hole (371) is provided in the fixing hole (371). Several first fastening bolts (7) are fixedly installed in the fixing hole (371). The first fastening bolts (7) pass through the fixing hole (371) and are fixedly connected to the planet carrier (34) and the gear shaft (36). The sun gear (33) meshes with the inner side of the planet gear (32). A connecting cylinder (331) is formed at one end of the sun gear (33).

2. The gearbox according to claim 1, characterized in that: The fuel injector assembly (4) includes a fuel injector seat (41) and a fuel injector rod (42). The fuel injector seat (41) is connected to the connecting cylinder (331). The fuel injector rod (42) is fixedly installed on both sides of the fuel injector seat (41) and the fuel injector rod (42) and the fuel injector seat (41) are internally connected. One end of the input shaft (5) is connected to the fuel injector seat (41).

3. A gearbox according to claim 1, characterized in that: A mounting platform (342) is formed at the center of the planetary carrier (34). A plurality of bolt holes (343) are provided in the mounting platform (342). The bolt holes (343) are stepped and the inner diameter of the bolt holes (343) is larger than the outer diameter. The mounting platform (342) is in contact with the end face of the output shaft (6). A second fastening bolt (8) is inserted in the bolt hole (343). One end of the second fastening bolt (8) extending out of the bolt hole (343) is fixedly connected to the output shaft (6).

4. A gearbox according to claim 1, characterized in that: The input shaft (5) is fitted with an input shaft bearing (51), and the output shaft (6) is fitted with an output shaft bearing (61).

5. A gearbox according to claim 1, characterized in that: Connecting rings (312) are formed on both sides of the external gear ring (31), and the front housing (1) and the rear housing (2) are respectively connected to the connecting rings (312) on both sides of the external gear ring (31).

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