Axial positioning structure of main shaft gear of multi-gear transmission

Abstract

An axial positioning structure for the main shaft gear of a multi-speed transmission, relating to the field of transmission technology, employs a helical gear axial positioning method to meet the positioning requirements of the gear's axial force. In this structure, the main shaft is supported at both ends by tapered bearings; the gear assembly includes a first gear, a second gear, a third gear, a gear sleeve, a hexagonal key, and a shaft retaining ring, all using a floating assembly configuration; the internal spline of the gear sleeve has a missing tooth structure; the spline retaining ring bears the axial force, and the hexagonal key provides circumferential restraint to the spline retaining ring, while the shaft retaining ring prevents the hexagonal key from disengaging; the third gear is restrained directly by the inner ring of the bearing via the hexagonal key.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to an axial positioning structure for the main shaft gear of a multi-speed gearbox. Background Technology

[0002] Currently, in order to meet the high torque output characteristics, electric multi-speed gearboxes typically use a dual intermediate shaft method for power splitting, employ helical gears, and adopt a floating structure for the main shaft gear, thereby reducing the axial dimension of the gearbox.

[0003] However, the meshing of helical gears generates significant axial forces. To meet the requirements for shifting accuracy and gear profile modification, ensuring precise axial positioning of the gears becomes a technical challenge. In other words, to guarantee noise reduction and high torque, electric multi-speed transmissions typically use helical gears for transmission, resulting in substantial axial forces and making axial gear positioning difficult.

[0004] In existing technologies, spline pads are used to limit gear movement, hexagonal keys are used to restrict rotation, and elastic cylindrical pins are used to limit the hexagonal keys. However, the inventors of this application have found that using elastic cylindrical pins for limiting movement makes secondary disassembly impossible; the 45 steel material is prone to deformation under prolonged stress, resulting in inaccurate positioning; in addition, the structure is complex, and the axial dimension control tolerance is large. Utility Model Content

[0005] The purpose of this utility model is to provide an axial positioning structure for the main shaft gear of a multi-speed gearbox, which adopts a helical gear axial positioning method to meet the positioning requirements of the gear axial force.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An axial positioning structure for the main shaft gear of a multi-speed gearbox includes: a main shaft, both ends of which are supported by tapered bearings; gears are assembled with a first gear, a second gear, a third gear, a gear sleeve, a hexagonal key, and a shaft retaining ring, and all gears are in a floating assembly form; the internal spline of the gear sleeve has a missing tooth structure.

[0008] The spline retaining ring bears the axial force, and the hexagonal key is used to limit the circumferential movement of the spline retaining ring. At the same time, the shaft retaining ring prevents the hexagonal key from disengaging. The third gear is limited by the hexagonal key directly using the inner ring of the bearing.

[0009] In practical applications, after the first gear is assembled, the first spline retaining ring is inserted along the spline of the main shaft. After it is in place, the first gear sleeve is rotated to offset it so that the tooth groove of the first spline retaining ring is in the same radial direction as the tooth groove of the spline of the main shaft.

[0010] Specifically, the first gear is fitted in, and then the second spline retaining ring of the second gear is rotated according to the first spline retaining ring and fitted into the second gear, as well as the third spline retaining ring on the other side of the second gear and rotated.

[0011] Specifically, the first hexagonal key is inserted by aligning it with the missing tooth position of the first toothed sleeve, and the spline retaining ring is rotated to ensure that the first hexagonal key is inserted smoothly. Finally, the shaft retaining ring is assembled to prevent the first hexagonal key from coming out.

[0012] Further, assemble the third gear, install the fourth spline retaining ring along the spline of the main shaft and rotate the fourth spline retaining ring, install the second hexagonal key along the tooth groove, align the missing tooth position of the second tooth sleeve with the second hexagonal key and install it, and assemble the tapered bearing.

[0013] Compared with the prior art, the axial positioning structure of the multi-speed gearbox main shaft gear described in this utility model has the following advantages:

[0014] In the axial positioning structure of the main shaft gear of the multi-speed gearbox provided by this utility model, since the tooth thickness of the spline retaining ring is opposite to the spline tooth thickness of the main shaft, the hexagonal key can ensure that the spline retaining ring is not required after installation, thus it can withstand a large axial force, and the gear positioning can be accurately achieved through dimensional chain control; in addition, the hexagonal key of the first and second gears is limited by the shaft retaining ring, which facilitates disassembly and observation of the status of each transmission component; at the same time, the tapered bearing can further withstand a large axial force, and the floating structure can make the gear load more even. Attached Figure Description

[0015] Figure 1 A schematic diagram of the axial positioning structure of the main shaft gear of the multi-speed gearbox provided in this embodiment of the utility model.

[0016] Figure label:

[0017] 1-Spindle; 2-Tapered bearing; 3-First gear; 4-Second gear; 5-Third gear; 6-Gear sleeve; 61-First gear sleeve; 62-Second gear sleeve; 7-Hexagonal key; 71-First hexagonal key; 72-Second hexagonal key; 8-Shaft retaining ring; 9-Spline retaining ring; 91-First spline retaining ring; 92-Second spline retaining ring; 93-Third spline retaining ring; 94-Fourth spline retaining ring. Detailed Implementation

[0018] For ease of understanding, the axial positioning structure of the main shaft gear of the multi-speed gearbox provided in the present invention will be described in detail below with reference to the accompanying drawings.

[0019] This utility model embodiment provides an axial positioning structure for the main shaft gear of a multi-speed gearbox, such as... Figure 1As shown, it includes: a main shaft 1, which is supported at both ends by tapered bearings 2; a gear assembly consisting of a first gear 3, a second gear 4, a third gear 5, a gear sleeve 6, a hexagonal key 7, and a shaft retaining ring 8, and all gears are assembled in a floating manner; the internal spline of the gear sleeve 6 has a missing tooth structure.

[0020] The spline retaining ring 9 bears the axial force, and the hexagonal key 7 is used to limit the circumferential movement of the spline retaining ring 9. At the same time, the shaft retaining ring 8 restricts the hexagonal key 7 from disengaging. The third gear 5 is limited by the bearing inner ring directly through the hexagonal key 7.

[0021] Compared with the prior art, the axial positioning structure of the multi-speed gearbox main shaft gear described in this embodiment of the invention has the following advantages:

[0022] In the axial positioning structure of the main shaft gear of the multi-speed gearbox provided in this embodiment of the utility model, since the tooth thickness of the spline retaining ring is opposite to the spline tooth thickness of the main shaft, the hexagonal key can ensure that the spline retaining ring is not required after installation, thus it can withstand a large axial force, and the gear positioning can be accurately achieved through dimensional chain control; in addition, the hexagonal key of the first and second gears is limited by the shaft retaining ring, which facilitates disassembly and observation of the status of each transmission component; at the same time, the tapered bearing can further withstand a large axial force, and the floating structure can make the gear load more even.

[0023] In practical applications, such as Figure 1 As shown, after the first gear 3 is assembled, the first spline retaining ring 91 is inserted along the spline of the main shaft 1. After it is in place, the first gear sleeve 61 is rotated to offset it so that the tooth groove of the first spline retaining ring 91 is in the same radial direction as the tooth groove of the spline of the main shaft 1.

[0024] Among them, such as Figure 1 As shown, the first gear sleeve 61 is installed, and the second spline retaining ring 92 of the second gear 4 is rotated according to the first spline retaining ring 91, and the second gear 4 is installed, as well as the third spline retaining ring 93 on the other side of the second gear 4 and rotated.

[0025] Specifically, such as Figure 1 As shown, the first hexagonal key 71 is aligned with the missing tooth position of the first toothed sleeve 61 and inserted, and the spline retaining ring 9 is rotated to ensure that the first hexagonal key 71 is inserted smoothly. Finally, the shaft retaining ring 8 is assembled to prevent the first hexagonal key 71 from coming out.

[0026] Furthermore, such as Figure 1 As shown, assemble the above-mentioned three-speed gear 5, install the fourth spline retaining ring 94 along the spline of the main shaft 1 and rotate the fourth spline retaining ring 94, install the second hexagonal key 72 along the tooth groove, align the missing tooth position of the second tooth sleeve 62 with the second hexagonal key 72 and install it, and assemble the tapered bearing 2.

[0027] In summary, the axial positioning structure for the main shaft gear of the multi-speed gearbox provided in this embodiment of the invention has the following advantages:

[0028] First, its simple structure effectively reduces the axial dimension of the gear shaft.

[0029] II. The retaining ring has strong axial load-bearing capacity;

[0030] Third, the spline retaining ring is limited by a hexagonal key, which simplifies assembly;

[0031] IV. The spline retaining ring, gear sleeve and spindle are all equipped with splines.

[0032] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An axial positioning structure for the main shaft gear of a multi-speed gearbox, characterized in that, include: The main shaft is supported at both ends by tapered bearings; the gear assembly includes a first gear, a second gear, a third gear, as well as a gear sleeve, a hexagonal key, and a shaft retaining ring, and all gears are assembled in a floating manner; the internal spline of the gear sleeve has a missing tooth structure. The spline retaining ring bears the axial force, and the hexagonal key is used to limit the circumferential movement of the spline retaining ring. At the same time, the shaft retaining ring prevents the hexagonal key from disengaging. The third gear is limited by the hexagonal key directly using the inner ring of the bearing.

2. The axial positioning structure for the main shaft gear of a multi-speed gearbox according to claim 1, characterized in that, After the first gear is assembled, the first spline retaining ring is inserted along the spline of the main shaft. After it is in place, the first gear sleeve is rotated to offset it so that the tooth groove of the first spline retaining ring is in the same radial direction as the tooth groove of the spline of the main shaft.

3. The axial positioning structure for the main shaft gear of a multi-speed gearbox according to claim 2, characterized in that, Insert the first gear into the gear, then rotate the second spline retaining ring of the second gear according to the first spline retaining ring, and insert the second gear and the third spline retaining ring on the other side of the second gear and rotate them.

4. The axial positioning structure for the main shaft gear of a multi-speed gearbox according to claim 3, characterized in that, The first hexagonal key is inserted by aligning it with the missing tooth position of the first toothed sleeve, and the spline retaining ring is rotated to ensure that the first hexagonal key is inserted smoothly. Finally, the shaft retaining ring is assembled to prevent the first hexagonal key from coming out.

5. The axial positioning structure for the main shaft gear of a multi-speed gearbox according to claim 4, characterized in that, Assemble the three-speed gear, insert the fourth spline retaining ring along the spline of the main shaft and rotate the fourth spline retaining ring, insert the second hexagonal key along the tooth groove, align the missing tooth position of the second tooth sleeve with the second hexagonal key and insert it, and assemble the tapered bearing.

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