A double internal meshing two-speed transmission mechanism

Abstract

The present invention provides a double internal meshing two-speed transmission mechanism, comprising an input shaft, an output shaft, a sun gear, a gear ring and a gear ring, wherein the sun gear is mounted on the input shaft by using a spline, the gear ring is mounted on the output shaft by using a spline, the inner circumference of the gear ring is provided with internal teeth, the outer circumference of the gear ring is provided with external teeth, the sun gear meshes with the inner teeth of the gear ring, the gear ring meshes with the outer teeth of the gear ring, and the tooth profiles of the inner teeth and the outer teeth of the gear ring are both cycloid. By adopting the technical scheme of the present invention, a gear ring with cycloid gear teeth respectively arranged on the inner and outer circumferences is adopted to replace the existing involute planetary gear, thereby improving the overlap of the gear transmission mechanism, the cycloid gear transmission mechanism has a low sliding rate and is a constant constant, the transmission is more stable, the impact vibration resistance is stronger, the cycloid gear has a smaller outer geometric size, and the output torque is greater, thereby reducing the outer volume and weight of the entire transmission mechanism, and in addition, the cycloid gear has lower requirements for processing and manufacturing accuracy and assembly accuracy, thereby reducing the assembly difficulty.

Description

Technical Field

[0001] The invention belongs to the technical field of speed change mechanisms, in particular to a double internal meshing two-speed speed change mechanism. Background Art

[0002] At present, the speed change mechanism is widely used in various vehicles and machine tools. The speed change mechanism is an important component in these mechanical equipment. With the development of technology, the speed change gears of the existing speed change mechanism are increasing. However, most of the existing speed change mechanisms are composed of involute cylindrical gear transmission mechanisms. According to the different composition structures of the speed change mechanism, it can be divided into two types: fixed-axis speed change mechanism and planetary gear change mechanism. Among them, the fixed-axis speed change mechanism is large in size, and the involute cylindrical gear transmission mechanism used inside is of large mass, which also makes the overall mass of the fixed-axis speed change mechanism large. The planetary gear transmission mechanism has a compact structure, small volume and mass, a larger adjustable range of transmission ratio, and a wider application. However, due to the high requirements of the involute cylindrical gear transmission mechanism on the manufacturing and processing accuracy and assembly accuracy, the number of gears used is large, and the meshing connection between multiple gears is complex. It is extremely difficult to axially position and radially align the gears. The overlap in the gear transmission is low, the load is low, and the impact resistance is low, which affects the operation efficiency of the speed change mechanism. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a double internal meshing two-speed transmission mechanism.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a double internal meshing two-speed transmission mechanism, comprising an input shaft, an output shaft, a sun gear, a gear ring and a gear ring, wherein the sun gear is mounted on the input shaft by using a spline, the gear ring is mounted on the output shaft by using a spline, the inner circumference of the gear ring is provided with internal teeth, the outer circumference of the gear ring is provided with external teeth, the sun gear meshes with the inner teeth of the gear ring, the gear ring meshes with the outer teeth of the gear ring, and the tooth profiles of the inner teeth and the outer teeth of the gear ring are both cycloids.

[0006] The double internal meshing two-speed transmission mechanism also includes a clutch, a brake and a planetary carrier. The clutch is mounted on the input shaft by using a spline, the planetary carrier is mounted on the input shaft by using a rolling bearing, the gear ring is mounted on the planetary carrier by using a rolling bearing, and the input shaft, output shaft and the clutch, planetary carrier, and brake are all coaxially arranged, the axial spacing between the gear ring and the input shaft, output shaft, clutch, planetary carrier or brake is greater than zero, and the brake is mounted on the planetary carrier.

[0007] The rolling bearing is a deep groove ball bearing.

[0008] The axial eccentricity between the gear ring and the input shaft, output shaft, clutch, planet carrier or brake is determined by the transmission ratio between the input shaft and the output shaft.

[0009] The clutch is connected to the brake via a friction plate.

[0010] The input shaft, sun gear, gear ring and output shaft are all coaxially arranged, and the axial spacing between the gear ring and the input shaft, sun gear, gear ring or output shaft is greater than zero.

[0011] The axial eccentricity between the ring gear and the input shaft, the sun gear, the ring gear or the output shaft is determined by the transmission ratio between the input shaft and the output shaft.

[0012] The gear ring is an internal gear ring with gear teeth arranged on its inner circumferential surface.

[0013] The beneficial effects of the present invention are as follows: when the technical solution of the present invention is adopted, when the clutch and the brake are not engaged, it is neutral gear; when the clutch is engaged, the input shaft, the clutch, the planet carrier, and the sun gear rotate at the same angular velocity, then the gear ring, the gear ring, and the output shaft also rotate together at the same angular velocity, the planetary row rotates as a whole, the transmission ratio between the input shaft and the output shaft is 1, that is, the first gear; when the clutch is released and the brake is engaged, since the planet carrier is fixed, the input shaft drives the sun gear to rotate at the same angular velocity, the sun gear meshes with the inner teeth of the gear ring, so that the sun gear and the gear ring rotate in phase, the outer teeth of the gear ring drive the inner gear ring to rotate in phase at a lower speed, and the gear ring drives the output The shafts rotate in phase, which is the 2nd gear. The present invention adopts a gear ring with cycloid gear teeth on the inner and outer circumferential surfaces to replace the existing involute planetary gear, and changes the existing involute gear into a cycloid gear, thereby improving the overlap of the gear transmission mechanism. The cycloid gear transmission mechanism has a low sliding rate and is a constant constant, and the transmission is smoother and has a stronger ability to resist impact and vibration. At the same time, the cycloid gear has a larger output torque under the condition of a smaller external geometric dimension, so that the entire speed change mechanism has a more compact structure, a smaller volume, and a correspondingly reduced overall weight. In addition, the cycloid gear has lower requirements on processing and manufacturing accuracy and assembly accuracy, which reduces the difficulty of assembly and is convenient for large-scale batch assembly and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] In the figure: 1-input shaft, 3-clutch, 4-planet carrier, 6-brake, 7-sun gear, 8-ring gear, 9-annular gear, 10-output shaft. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0017] like Figure 1As shown, the present invention provides a double internal meshing two-speed transmission mechanism, including an input shaft 1, an output shaft 10, a sun gear 7, a gear ring 8 and a gear ring 9. The sun gear 7 is mounted on the input shaft 1 by using a spline, and the gear ring 9 is mounted on the output shaft 10 by using a spline. The inner circumference of the gear ring 8 is provided with internal teeth, and the outer circumference of the gear ring 8 is provided with external teeth. The sun gear 7 meshes with the inner teeth of the gear ring 8, and the gear ring 9 meshes with the outer teeth of the gear ring 8. The tooth profiles of the inner teeth and the outer teeth of the gear ring 8 are both cycloids.

[0018] Furthermore, the double internal meshing two-speed transmission mechanism also includes a clutch 3, a brake 6 and a planetary carrier 4, the clutch 3 is mounted on the input shaft 1 by using a spline, the planetary carrier 4 is mounted on the input shaft 1 by using a rolling bearing, the ring gear 8 is mounted on the planetary carrier 4 by using a rolling bearing, and the input shaft 1, the output shaft 10 and the clutch 3, the planetary carrier 4, the brake 6 are all coaxially arranged, the axial spacing between the ring gear 8 and the input shaft 1, the output shaft 10, the clutch 3, the planetary carrier 4 or the brake 6 is greater than zero, and the brake 6 is mounted on the planetary carrier 4.

[0019] In addition, the rolling bearing is preferably a deep groove ball bearing. The axial eccentricity between the gear ring 8 and the input shaft 1, the output shaft 10, the clutch 3, the planetary carrier 4 or the brake 6 is determined by the transmission ratio between the input shaft 1 and the output shaft 10. The clutch 3 and the brake 6 are connected through friction plates.

[0020] In addition, the input shaft 1, the sun gear 7, the ring gear 9 and the output shaft 10 are all coaxially arranged, and the axial spacing between the ring gear 8 and the input shaft 1, the sun gear 7, the ring gear 9 or the output shaft 10 is greater than zero. The axial eccentricity between the ring gear 8 and the input shaft 1, the sun gear 7, the ring gear 9 or the output shaft 10 is determined by the transmission ratio between the input shaft 1 and the output shaft 10. The ring gear 9 is an internal gear ring with gear teeth arranged on its inner circumference.

[0021] By adopting the technical solution of the present invention, when the clutch and the brake are not engaged, it is neutral gear. When the clutch is engaged, the input shaft, the clutch, the planetary carrier, and the sun gear rotate at the same angular velocity, and the ring gear, the gear ring, and the output shaft also rotate together at the same angular velocity. The planetary row rotates as a whole, and the transmission ratio between the input shaft and the output shaft is 1, that is, the first gear. When the clutch is released and the brake is engaged, since the planetary carrier is fixed, the input shaft drives the sun gear to rotate at the same angular velocity, and the sun gear meshes with the inner teeth of the gear ring, so that the sun gear and the gear ring rotate in phase, the outer teeth of the gear ring drive the inner gear ring to rotate in phase at a lower speed, and the gear ring drives the output shaft to rotate in phase. That is, the 2nd gear. The present invention adopts a gear ring with cycloidal gear teeth on the inner and outer circumferential surfaces to replace the existing involute planetary gear, and changes the existing involute gear into a cycloidal gear, thereby improving the overlap of the gear transmission mechanism. The cycloidal gear transmission mechanism has a low sliding rate and is a constant constant, and the transmission is smoother and has a stronger ability to resist impact and vibration. At the same time, the cycloidal gear has a larger output torque under the condition of a smaller external geometric dimension, so that the entire speed change mechanism has a more compact structure, a smaller volume, and a correspondingly reduced overall weight. In addition, the cycloidal gear has lower requirements for processing and manufacturing accuracy and assembly accuracy, which reduces the difficulty of assembly and is convenient for large-scale batch assembly and production.

Claims

1. A double internal meshing two-speed transmission mechanism, comprising an input shaft (1), an output shaft (10), a sun gear (7), a gear ring (8) and a gear ring (9), wherein the sun gear (7) is mounted on the input shaft (1) by using a spline, the gear ring (9) is mounted on the output shaft (10) by using a spline, the inner circumference of the gear ring (8) is provided with internal teeth, and the outer circumference of the gear ring (8) is provided with external teeth, the sun gear (7) meshes with the inner teeth of the gear ring (8), the gear ring (9) meshes with the outer teeth of the gear ring (8), and the tooth profiles of the inner teeth and the outer teeth of the gear ring (8) are both cycloids; the double internal meshing two-speed transmission mechanism also comprises a clutch (3), a brake (6) and a planet carrier (4), the clutch (3) is mounted on the input shaft (1) by using a spline, the planet carrier (4) is mounted on the output shaft (10) by using a spline, the inner circumference of the gear ring (8) is provided with internal teeth, and the outer circumference of the gear ring (8) is provided with external teeth, the sun gear (7) meshes with the inner teeth of the gear ring (8), and the gear ring (9) meshes with the outer teeth of the gear ring (8), and the tooth profiles of the inner teeth and the outer teeth of the gear ring (8) are both cycloids. The gear ring (8) is mounted on the input shaft (1) by using a rolling bearing, and the gear ring (8) is mounted on the planet carrier (4) by using a rolling bearing. The input shaft (1), the output shaft (10), the clutch (3), the planet carrier (4), and the brake (6) are all coaxially arranged. The axial spacing between the gear ring (8) and the input shaft (1), the output shaft (10), the clutch (3), the planet carrier (4), or the brake (6) is greater than zero. The brake (6) is mounted on the planet carrier (4); the clutch (3) and the brake (6) are connected by a friction plate. The input shaft (1), the sun gear (7), the gear ring (9), and the output shaft (10) are all coaxially arranged. The axial spacing between the gear ring (8) and the input shaft (1), the sun gear (7), the gear ring (9), or the output shaft (10) is greater than zero.

2. The double internal meshing two-speed transmission mechanism according to claim 1, characterized in that: The rolling bearing is a deep groove ball bearing.

3. The double internal meshing two-speed transmission mechanism according to claim 1, characterized in that: The axial eccentricity between the gear ring (8) and the input shaft (1), the output shaft (10), the clutch (3), the planetary carrier (4) or the brake (6) is determined by the transmission ratio between the input shaft (1) and the output shaft (10).

4. The double internal meshing two-speed transmission mechanism according to claim 1, characterized in that: The axial eccentricity between the gear ring (8) and the input shaft (1), the sun gear (7), the gear ring (9) or the output shaft (10) is determined by the transmission ratio between the input shaft (1) and the output shaft (10).

5. The double internal meshing two-speed transmission mechanism according to claim 1, characterized in that: The gear ring (9) is an internal gear ring with gear teeth arranged on its inner circumferential surface.

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