Reduction gear structure of heavy truck electric drive system
By introducing an oil seal positioning step and vent hole design into the reducer structure, combined with the sealing sleeve and oil seal structure, the problems of the reducer's inability to seal independently and oil leakage are solved, achieving lightweight, low-cost and high-efficiency reducer assembly.
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YINCHUAN WEIMA MOTOR CO LTD
- Filing Date
- 2025-09-29
- Publication Date
- 2026-07-31
AI Technical Summary
The existing reducer structure of heavy-duty truck electric drive systems has the problem that it cannot be sealed independently. The O-ring seals are easy to scratch when disassembling and assembling, and are difficult to assemble, resulting in oil leakage and inconvenience in assembly.
By adopting an oil seal positioning step and vent hole design, combined with a sealing sleeve and oil seal structure, the reducer assembly can be independently sealed, avoiding negative pressure formation and eliminating the need for O-ring seals.
It achieves independent sealing of the reducer, prevents oil leakage, simplifies the assembly process, and improves reliability and ease of installation.
Smart Images
Figure CN224579724U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of speed reducer technology, and in particular to a speed reducer structure for a heavy-duty truck electric drive system. Background Technology
[0002] Currently, most new energy heavy trucks on the domestic market typically adopt a "low-speed motor + gearbox" structure, which generally suffers from technical problems such as large size, heavy weight, and high cost.
[0003] Specifically, the sealing of reducers and transmissions in some existing products mostly uses O-rings at the input shaft of the transmission and the output shaft of the reducer. However, since the input shaft of the transmission and the output shaft of the reducer are connected by splines to transmit torque, this structure is prone to scratching and damaging the O-rings during disassembly and assembly, and assembly is difficult. At the same time, the reducer cannot be sealed independently, which affects the production and testing of the reducer.
[0004] In summary, how to provide a reducer structure for a heavy-duty truck electric drive system that is lightweight, low-cost, and highly efficient has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this utility model is to provide a reducer structure for a heavy-duty truck electric drive system, which solves the technical problems of existing reducers being unable to be independently sealed due to structural limitations, and the ease with which O-ring seals can be scratched during disassembly and assembly.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A reducer structure for a heavy-duty truck electric drive system includes: a high-speed motor assembly, a reducer assembly, and a multi-speed gearbox assembly;
[0008] The reducer assembly includes: an input shaft assembly, an input shaft first oil seal, an input shaft second oil seal, a front housing, a rear housing, an intermediate shaft assembly, an output shaft assembly, an output shaft oil seal, and a bearing end cover; the input shaft assembly is connected to the high-speed motor assembly via a spline, and the output shaft assembly is connected to the multi-speed gearbox assembly via a spline;
[0009] The output shaft assembly includes a sealing sleeve and an output shaft gear, wherein the output shaft gear is provided with a mounting step for engaging with the sealing sleeve; the sealing sleeve and the output shaft gear are welded at the mounting step; an output shaft bearing is used to support the output shaft assembly, and the output shaft bearing is provided with an oil seal mounting position for engaging with the output shaft oil seal, which is installed in the rear housing; through the sealing of the sealing sleeve, the multi-speed gearbox assembly and the output shaft assembly are connected via a first spline without the need for an O-ring seal structure;
[0010] The front housing is provided with an oil seal positioning step, which is used to install and position the first oil seal and the second oil seal of the input shaft respectively; the front housing is provided with an exhaust hole, which is used to prevent negative pressure from forming in the area between the double oil seal structures.
[0011] Compared with the prior art, the reducer structure of the heavy-duty truck electric drive system described in this utility model has the following advantages:
[0012] The reducer structure for a heavy-duty truck electric drive system provided by this utility model features an oil seal positioning step on the front housing. This step is used to install and position the first oil seal and the second oil seal of the input shaft. The front housing also has a vent hole to prevent negative pressure from forming between the two oil seals, thus effectively preventing oil leakage. Furthermore, the reducer assembly can be independently sealed through the input shaft oil seal and the output sealing sleeve and oil seal structure, facilitating assembly and testing while effectively preventing oil leakage. In summary, the reducer structure for a heavy-duty truck electric drive system provided by this utility model is not only simple in structure but also highly reliable and easy to install. Attached Figure Description
[0013] Figure 1 A cross-sectional view of the reducer structure of the heavy-duty truck electric drive system provided in this embodiment of the utility model;
[0014] Figure 2 A cross-sectional view of the reducer assembly in the reducer structure of the heavy-duty truck electric drive system provided in this embodiment of the utility model;
[0015] Figure 3 A cross-sectional view of the output shaft assembly in the reducer structure of the heavy-duty truck electric drive system provided in this embodiment of the utility model;
[0016] Figure 4 This is a cross-sectional view of the input seal in the reducer structure of the heavy-duty truck electric drive system provided in an embodiment of the present invention.
[0017] Figure label:
[0018] 1-High-speed motor assembly; 2-Reducer assembly; 3-Multi-speed gearbox assembly;
[0019] 21-Input shaft assembly; 22-Input shaft first oil seal; 23-Input shaft second oil seal; 24-Front housing; 25-Rear housing; 26-Intermediate shaft assembly; 27-Output shaft assembly; 28-Output shaft oil seal; 29-Bearing end cover;
[0020] 31-Sealing sleeve; 32-Mounting step; 33-Output shaft gear; 34-Output shaft bearing; 35-Oil seal mounting position; 36-First spline;
[0021] 241 - Oil seal positioning step; 242 - Vent hole. Detailed Implementation
[0022] For ease of understanding, the structure of the reducer of the heavy-duty truck electric drive system provided in the present invention will be described in detail below with reference to the accompanying drawings.
[0023] This utility model embodiment provides a reducer structure for a heavy-duty truck electric drive system, such as... Figures 1-4 As shown, it includes: a high-speed motor assembly 1, a reducer assembly 2, and a multi-speed gearbox assembly 3;
[0024] The reducer assembly 2 includes: an input shaft assembly 21, an input shaft first oil seal 22, an input shaft second oil seal 23, a front housing 24, a rear housing 25, an intermediate shaft assembly 26, an output shaft assembly 27, an output shaft oil seal 28, and a bearing end cover 29; the input shaft assembly 21 is connected to the high-speed motor assembly 1 via a spline, and the output shaft assembly 27 is connected to the multi-speed gearbox assembly 3 via a spline;
[0025] The output shaft assembly 27 includes a sealing sleeve 31 and an output shaft gear 33. The output shaft gear 33 is provided with an installation step 32, which is used to mate with the sealing sleeve 31. The sealing sleeve 31 and the output shaft gear 33 are welded at the installation step 32 to ensure sealing and strength. The output shaft bearing 34 is used to support the output shaft assembly 27, and the output shaft bearing 34 is provided with an oil seal mounting position 35, which is used to mate with the output shaft oil seal 28. The output shaft oil seal 28 is installed on the rear housing 25. Through the sealing of the sealing sleeve 31, the multi-speed gearbox assembly 3 and the output shaft assembly 27 are connected through the first spline 36 without the need for an O-ring seal structure, which can ensure that the reducer assembly does not leak oil and can also ensure that the reducer assembly achieves independent sealing.
[0026] The front housing 24 is provided with an oil seal positioning step 241, which is used to install the first oil seal 22 of the positioning input shaft and the second oil seal 23 of the input shaft respectively; the front housing 24 is provided with an exhaust hole 242, which is used to prevent negative pressure from forming in the area between the double oil seal structures.
[0027] Compared with the prior art, the reducer structure of the heavy-duty truck electric drive system described in this embodiment of the invention has the following advantages:
[0028] In the reducer structure of the heavy-duty truck electric drive system provided in this embodiment of the invention, the front housing is provided with oil seal positioning steps, which are used to install and position the first oil seal and the second oil seal of the input shaft. Simultaneously, the front housing is provided with an exhaust port to prevent negative pressure from forming between the two oil seal structures, thus effectively avoiding oil leakage. Furthermore, because the reducer assembly can independently seal the reducer system through the input shaft oil seal sealing structure and the output sealing sleeve and oil seal structure, it not only facilitates the assembly and testing of the reducer assembly but also effectively prevents oil leakage. In summary, the reducer structure of the heavy-duty truck electric drive system provided in this embodiment of the invention is not only simple in structure but also highly reliable and easy to install.
[0029] 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. A heavy truck electric drive system reducer structure, characterized in that, include: High-speed motor assembly, reducer assembly, and multi-speed gearbox assembly; The reducer assembly includes: an input shaft assembly, an input shaft first oil seal, an input shaft second oil seal, a front housing, a rear housing, an intermediate shaft assembly, an output shaft assembly, an output shaft oil seal, and a bearing end cover; the input shaft assembly is connected to the high-speed motor assembly via a spline, and the output shaft assembly is connected to the multi-speed gearbox assembly via a spline; The output shaft assembly includes a sealing sleeve and an output shaft gear, wherein the output shaft gear is provided with a mounting step for engaging with the sealing sleeve; the sealing sleeve and the output shaft gear are welded at the mounting step; an output shaft bearing is used to support the output shaft assembly, and the output shaft bearing is provided with an oil seal mounting position for engaging with the output shaft oil seal, which is installed in the rear housing; through the sealing of the sealing sleeve, the multi-speed gearbox assembly and the output shaft assembly are connected via a first spline without the need for an O-ring seal structure; The front housing is provided with an oil seal positioning step, which is used to install and position the first oil seal and the second oil seal of the input shaft respectively; the front housing is provided with an exhaust hole, which is used to prevent negative pressure from forming in the area between the double oil seal structures.