A one-piece intermediate shaft anti-backlash mechanism

By using an integrated intermediate shaft design and a one-piece molding process involving oblique gear cutting and gear hobbing, the problems of low assembly efficiency and high cost of intermediate shafts in commercial vehicle transmissions have been solved, resulting in a high-strength, low-slip intermediate shaft structure that improves shifting smoothness and comfort.

CN224515866UActive Publication Date: 2026-07-17ANHUI XINGRUI GEAR TRANSMISSION
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ANHUI XINGRUI GEAR TRANSMISSION
Filing Date
2025-07-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing five-speed manual transmissions for commercial vehicles, the intermediate shaft is usually assembled using an interference fit or welding process, which results in low assembly efficiency or high cost, and poses risks of slippage and slippage.

Method used

It adopts an integral intermediate shaft design, with the central main gear, central third gear, central second gear, central first gear, and central reverse gear being integrally machined with the shaft body. It combines oblique gear shaping and gear hobbing into one piece, uses spline grooves and spline holes for connection, and is equipped with tapered bearings to avoid additional fixing measures such as welding.

Benefits of technology

It improves the strength and service life of the intermediate shaft, avoids slippage and uneven movement, enhances shifting smoothness and comfort, and reduces labor costs and deformation risk.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224515866U_ABST
    Figure CN224515866U_ABST
Patent Text Reader

Abstract

The utility model discloses a whole type intermediate shaft anti -shifting mechanism, including the shaft body, still including setting in the main tooth of shaft body, middle three teeth and middle two teeth, the main tooth of middle, middle three teeth and middle two teeth and the whole type structure design of shaft body, and middle two teeth are located in the side of middle three teeth away from the main tooth, still be equipped with middle one tooth and middle inverted tooth in the side of shaft body away from middle two teeth, the whole adoption of ladder axle design of shaft body, and in the main tooth and middle three teeth such as heavy load gear corresponding axle section increase diameter, the shaft shoulder transition of shaft body has the big fillet for reducing stress concentration and falls. The utility model discloses a whole type intermediate shaft anti -shifting mechanism, through the whole type processing of shaft body and form, make the gear and the shaft become a whole, thereby in reducing the manual cost's time, avoid the risk of shifting caused by welding deformation, and then can effectively solve the gear slip and shifting caused by the excessive torque or load, improve the gear strength and prolong the service life.
Need to check novelty before this filing date? Find Prior Art

Claims

1. An integral intermediate shaft anti-slip mechanism, comprising: Shaft (1); Its characteristic is that it further includes: The shaft (1) is equipped with a central main tooth (2), a central third tooth (3), and a central second tooth (4). The central main tooth (2), central third tooth (3), and central second tooth (4) are integrally designed with the shaft (1). The central second tooth (4) is located on the side of the central third tooth (3) away from the central main tooth (2). The shaft (1) is also provided with a central first tooth (5) and a central back tooth (6) on the side away from the central second tooth (4). The shaft (1) adopts a stepped shaft design as a whole. The diameter is increased in the shaft segments corresponding to heavy-duty gears such as the central main tooth (2) and the central third tooth (3). The shaft shoulder transition of the shaft (1) has a large fillet to reduce stress concentration.

2. The integral intermediate shaft anti-movement mechanism according to claim 1, characterized in that: The main tooth (2), the third tooth (3), and the second tooth (4) are all machined using a slanted tooth-cutting process, and a machining groove is left between the third tooth (3) and the second tooth (4) for deburring after tooth cutting.

3. A one-piece intermediate shaft anti-backlash mechanism according to claim 2, wherein: The middle tooth (5) and the middle back tooth (6) are integrally formed by hobbing. The shaft (1) has a clearance groove on the side wall of the middle back tooth (6) away from the middle second tooth (4) for hobbing cutting.

4. A one-piece intermediate shaft anti- tramp mechanism according to claim 3, characterized in that: The shaft (1) has a central fifth tooth (7) on the side of the central back tooth (6) away from the central second tooth (4). The central fifth tooth (7) is connected to the shaft (1) through a connecting assembly. The connecting assembly includes a spline groove (1001) and a spline hole (1002) respectively opened on the shaft (1) and the central fifth tooth (7). The spline groove (1001) and the spline hole (1002) are matched and arranged.

5. A one-piece intermediate shaft anti- tramp mechanism according to claim 4, characterized in that: The shaft (1) is provided with a fixing component for fixing the center five teeth (7). The fixing component includes a fixing hole (1101) opened on the bottom side wall of the shaft (1) near the spline groove (1001). An elastic retaining ring (1102) is provided in the fixing hole (1101).

6. A one-piece intermediate shaft anti-backlash mechanism as set forth in claim 5, wherein: The two ends of the shaft (1) assembly are respectively press-fitted with a first tapered bearing (8) and a second tapered bearing (9) for connection with the transmission assembly housing.