Planetary gear mechanism

Abstract

The utility model provides a planetary gear mechanism which comprises a planetary gear body, relative rotation speed eliminating gaskets are arranged on the two axial sides of a planetary gear in the planetary gear body, and limiting elbows are arranged on the relative rotation speed eliminating gaskets. A limiting groove is formed in a planet carrier in the planetary gear body, and the limiting elbow is assembled in the limiting groove. According to the planetary gear mechanism, the elbow with the limiting function is arranged on the relative rotating speed eliminating gasket in the planetary gear mechanism, meanwhile, the limiting groove is formed in the planet carrier, and the limiting elbow of the relative rotating speed eliminating gasket is assembled in the limiting groove of the planet carrier, so that the relative rotating speed of the planet carrier and the planetary gear is eliminated; the rotating speed and the temperature borne by the relative rotating speed eliminating gasket are sharply reduced, the risk of high-temperature ablation of the relative rotating speed eliminating gasket is reduced, and the service life of the whole planetary gear mechanism is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicles, relates to planetary gears, and mainly relates to a planetary gear mechanism. Background Art

[0002] Planetary gear mechanisms are widely used in hydraulic automatic transmissions. They offer advantages such as compact structure, small size, light weight, high load capacity, wide power transmission range and transmission ratio range, low operating noise, high efficiency, and long life. The planetary gears can rotate on their own axes or orbit around the central axis of the sun gear along with the planet carrier. This unique transmission method enables planetary gear transmissions to achieve large transmission ratios within a compact space, thus meeting the requirements of various complex mechanical systems. However, planetary gears operate at extremely high speeds, placing high demands on their components. Gaskets have the lowest strength in the entire planetary gear mechanism, leading to frequent failures caused by high-temperature gasket erosion, resulting in the loss of the entire planetary gear mechanism's ability to transmit power. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to propose a planetary gear mechanism to solve the technical problem in the existing technology that the planetary gear rotates very fast, resulting in high-temperature ablation and failure of the gasket due to excessive bearing capacity.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A planetary gear mechanism includes a planetary gear body, wherein relative speed elimination pads are provided on both axial sides of the planetary gears in the planetary gear body, and a limiting elbow is provided on the relative speed elimination pads; a limiting groove is provided on the planetary carrier in the planetary gear body, and the limiting elbow is assembled in the limiting groove.

[0006] The utility model also has the following technical features:

[0007] The planetary gear body includes a sun gear, which is engaged with the planetary gear, which is engaged with the transmission ring gear, the planetary gear is connected to the planetary shaft through a needle bearing, the planetary shaft is connected to the planetary carrier, and the planetary carrier is rigidly connected to the brake ring gear through a snap ring.

[0008] The planet carrier is provided with an elastic pin.

[0009] A bowl-shaped plug is also provided on the planetary shaft.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects:

[0011] The utility model proposes that an elbow with a limiting function is provided on the relative speed eliminating gasket in the planetary gear mechanism, and a limiting groove is provided on the planetary carrier. The limiting elbow of the relative speed eliminating gasket is assembled in the limiting groove of the planetary carrier, thereby eliminating the relative speed between the planetary carrier and the planetary gear, sharply reducing the speed and temperature borne by the relative speed eliminating gasket, reducing the risk of high-temperature ablation of the relative speed eliminating gasket, and improving the service life of the entire planetary gear mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic cross-section of a planetary gear mechanism.

[0013] Figure 2 Schematic diagram of the local details of the relative speed elimination gasket in the planetary gear mechanism.

[0014] Figure 3 A schematic diagram of another local detail of the relative speed elimination gasket in the planetary gear mechanism.

[0015] The meanings of the various numbers in the figure are: 1-planetary gear body, 2-planetary gear, 3-relative speed eliminating gasket, 4-limiting elbow, 5-planet carrier, 6-limiting groove, 7-sun gear, 8-drive ring gear, 9-needle bearing, 10-planet shaft, 11-circuit ring, 12-brake ring gear, 13-elastic pin, 14-bowl plug.

[0016] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0017] It should be noted that, unless otherwise specified, all devices and components in the present invention are devices and components known in the prior art.

[0018] In accordance with the above technical solution, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0019] Example:

[0020] This embodiment provides a planetary gear mechanism, including a planetary gear body 1, such as Figures 1 to 3 As shown, relative speed eliminating gaskets 3 are provided on both axial sides of the planetary gear 2 in the planetary gear body 1, and limiting elbows 4 are provided on the relative speed eliminating gaskets 3; limiting grooves 6 are provided on the planetary carrier 5 in the planetary gear body 1, and the limiting elbows 4 are assembled in the limiting grooves 6.

[0021] like Figures 1 to 3As shown, the planetary gear body 1 includes a sun gear 7, which is engaged with the planetary gear 2, which is engaged with the transmission ring gear 8, and the planetary gear 2 is connected to the planetary shaft 10 through a needle bearing 9, and the planetary shaft 10 is connected to the planetary carrier 5, and the planetary carrier 5 is rigidly connected to the brake ring gear 12 through a retaining ring 11.

[0022] like Figure 1 As shown, the planet carrier 5 is provided with an elastic pin 13 .

[0023] like Figure 1 As shown, a bowl-shaped plug 14 is also provided on the planet shaft 10 .

[0024] Specifically, in this embodiment, the elastic pin 13 is installed into the mounting hole of the planet carrier 5 by interference pressure; and the bowl-shaped plug 14 is installed into the end surface hole of the planet shaft 10 by interference pressure.

[0025] Specifically in this embodiment, the elastic pin 13 is composed of two layers, the inner side is rubber and the outer side includes a layer of 65Mn iron sheet, which has good assembly; the bowl-shaped plug 14 is made of low-carbon steel, has good plasticity, and is not prone to brittle fracture and falling off. The bowl-shaped plug 14 is used to seal the lubricating oil to prevent leakage.

[0026] In this embodiment, the relative speed elimination gasket 3 is made of alloy material, which is based on low carbon steel and sintered CuPb on the surface. 24 Sn4 alloy material has good fatigue resistance and load-bearing capacity. Four oil grooves are set on its surface, which can make the lubricating oil fully adhere to its surface to form a solid oil film, so that its capacity can be better exerted.

[0027] Specifically in this embodiment, the needle roller bearing 9 transmits the power of the planetary gear 2 to the planetary shaft 10 .

[0028] Specifically in this embodiment, the planetary shaft assembly consisting of the planetary shaft 10 and the bowl-shaped plug 14 is installed in the planetary shaft hole of the planetary carrier 5, the planetary carrier 5 is stood up, and the elastic pin 13 is installed in the mounting hole of the planetary carrier 5 by interference pressure, so that the planetary carrier 5, the elastic pin 13, the planetary shaft 10 and the bowl-shaped plug 14 are fixed together.

[0029] Specifically in this embodiment, the sun gear 7 transmits the engine power to the planetary gear 2 through the torque converter and clutch at the front end of the transmission. The planetary gear 2 transmits the power to the planetary shaft 10 through the needle bearing 9. When the brake ring gear 12 is not working, the planetary gear 2 drives the planetary shaft 10 and the transmission ring gear 8 to work together; when the brake ring gear 12 is working, the planetary carrier 5 and the planetary shaft 10 are braked, and the planetary gear 2 only drives the transmission ring gear 8 to work; the transmission ring gear 8 is connected to the remaining mechanisms of the rear end hydraulic transmission, and finally transmits the engine power to the drive shaft through the transmission. When the sun gear 7 transmits the power of the engine to the planetary gear 2, the planetary gear 2 forms different speed ratios under the two working conditions of the brake ring gear 12 and finally transmits the power to the transmission ring gear 8. The relative speed elimination gaskets 3 on both sides of the planetary gear 2 generate obvious heat when subjected to high speed. The limiting elbows 4 provided on the relative speed elimination gaskets 3 on both sides of the planetary gear 2 are assembled in the limiting grooves 6 of the planetary carrier 5, eliminating the relative speed between the planetary carrier 5 and the planetary gear 2, so that the speed and temperature borne by the relative speed elimination gaskets 3 are sharply reduced, reducing the risk of high-temperature ablation of the relative speed elimination gaskets 3, and improving the service life of the entire planetary gear mechanism.

Claims

1. A planetary gear mechanism, comprising a planetary gear body (1), characterized in that: Relative speed eliminating gaskets (3) are provided on both axial sides of the planetary gear (2) in the planetary gear body (1), and a limiting elbow (4) is provided on the relative speed eliminating gasket (3); a limiting groove (6) is provided on the planetary carrier (5) in the planetary gear body (1), and the limiting elbow (4) is assembled in the limiting groove (6).

2. The planetary gear mechanism according to claim 1, wherein: The planetary gear body (1) includes a sun gear (7), the sun gear (7) is meshed with the planetary gear (2), the planetary gear (2) is meshed with the transmission ring gear (8), the planetary gear (2) is connected to the planetary shaft (10) through a needle bearing (9), the planetary shaft (10) is connected to the planetary carrier (5), and the planetary carrier (5) is rigidly connected to the brake ring gear (12) through a snap ring (11).

3. The planetary gear mechanism according to claim 1, wherein: The planet carrier (5) is provided with an elastic pin (13).

4. The planetary gear mechanism according to claim 2, wherein: A bowl-shaped plug (14) is also provided on the planetary shaft (10).

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