Electric control transfer case gear shifting mechanism with neutral gear
By designing an electronically controlled transfer case with a neutral gear shifting mechanism, the problem of the lack of a neutral gear in traditional electronically controlled transfer cases is solved, realizing the switching of four gears and the power take-off function when parking, with a simple structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-07
- Publication Date
- 2026-03-03
AI Technical Summary
Traditional electronically controlled transfer cases lack a neutral position, failing to meet the parking power take-off needs of modified vehicle users.
An electronically controlled transfer case shifting mechanism with neutral gear was designed, comprising a high/low shift fork, a pin, a roller, a baffle, a cam, a shift shaft, a four-wheel drive shift fork, and a guide shaft. The cam's arc groove matches the movement of the shift fork, enabling the switching of four gears: two-wheel drive high speed, four-wheel drive high speed, neutral, and four-wheel drive low speed.
It enables four-speed switching to meet the power take-off requirements when parking, has a simple structure, and increases the functionality of the transfer case.
Smart Images
Figure CN223964870U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an electronically controlled transfer case shifting mechanism with neutral gear, belonging to the technical field of automotive transfer case equipment. Background Technology
[0002] The transfer case is a crucial component of four-wheel drive vehicles. With increasing demand for multi-functionality in four-wheel drive cars, more and more modification enthusiasts are hoping to add a power take-off (PTO) to their vehicles. Traditional electronically controlled transfer cases only have three gears: two-wheel drive high speed, four-wheel drive high speed, and four-wheel drive low speed. They cannot achieve PTO when the vehicle is stationary. Therefore, an electronically controlled transfer case with a neutral gear is needed to meet the needs of modification enthusiasts who require PTO when the vehicle is stationary. Utility Model Content
[0003] The purpose of this invention is to provide an electronically controlled transfer case shifting mechanism with a neutral gear. It has a simple structure and four gears: two-wheel drive high speed, four-wheel drive high speed, neutral, and four-wheel drive low speed, thus solving the problems existing in the background technology.
[0004] The technical solution of this utility model is:
[0005] An electronically controlled transfer case shifting mechanism with neutral gear includes a high / low shift fork, a pin, a roller, a baffle, a cam, a shift shaft, a four-wheel drive shift fork, and a guide shaft. The cam is fixed to the shift shaft by the baffle and has an arc-shaped groove A and an arc-shaped groove B. The high / low shift fork and the four-wheel drive shift fork are slidably connected to the guide shaft. The high / low shift fork has a roller, which is located in the arc-shaped groove A of the cam. The four-wheel drive shift fork has a pulley, which is located in the arc-shaped groove B of the cam.
[0006] Furthermore, the roller is mounted on the high / low shift fork by a pin, and the roller is tumbling within the arcuate groove A of the cam.
[0007] Furthermore, the curvature of the arc-shaped groove A is matched with the distance the high and low shift forks move on the guide shaft during gear shifting.
[0008] Furthermore, the arc-shaped groove B of the cam is provided on the outer surface of the cam, and its curvature matches the distance the four-wheel drive shift fork moves on the guide shaft during gear shifting.
[0009] Furthermore, the cam is rotatably connected to the transfer case housing via a shift shaft, the four-wheel drive shift fork is connected to the corresponding gear of the transfer case via a synchronizer, and the high / low shift fork is slidably connected between the input shaft and the planetary carrier via a high / low gear sleeve spline.
[0010] This invention utilizes a shift shaft to drive a cam to rotate, which in turn causes the four-wheel drive shift fork and the high / low shift fork to move axially on a guide shaft, thus achieving gear shifting.
[0011] The advantages of this utility model are: simple structure, addition of neutral gear, and the ability to add a power take-off unit to the transfer case input shaft or transmission to meet the power take-off requirements when parking. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the high / low shift fork of this utility model, in which rollers are mounted via pins.
[0013] Figure 2 This is a schematic diagram of the installation of the shift shaft assembly of this utility model;
[0014] Figure 3 This is a schematic diagram showing the unfolded shape of the two arc-shaped grooves of the cam in this utility model;
[0015] Figure 4 This is a schematic diagram of the transfer case of this utility model in the high-speed two-wheel drive position;
[0016] Figure 5 This is a schematic diagram of the transfer case of this utility model in the four-wheel drive high-speed gear position;
[0017] Figure 6 This is a schematic diagram of the transfer case of this utility model in neutral position;
[0018] Figure 7 This is a schematic diagram of the transfer case of this utility model in the low-speed four-wheel drive position;
[0019] Figure 8 This is a schematic diagram of power transmission when the transfer case of this utility model is in neutral.
[0020] In the diagram: 1. High / low shift fork; 2. Pin; 3. Roller; 4. Baffle; 5. Cam; 6. Shift shaft; 7. Four-wheel drive shift fork; 8. Guide shaft; 9. High / low gear sleeve; 10. Planetary carrier; 11. Input shaft; 12. Arc groove A; 13. Arc groove B; 14. Pulley. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and examples.
[0022] See attached document Figures 1-8 An electronically controlled transfer case shifting mechanism with neutral gear includes a high / low shift fork 1, a pin 2, a roller 3, a baffle 4, a cam 5, a shift shaft 6, a four-wheel drive shift fork 7, and a guide shaft 8. The cam 5 is fixed to the shift shaft 6 by the baffle 4. The cam 5 is provided with an arc-shaped groove A12 and an arc-shaped groove B13. The high / low shift fork 1 and the four-wheel drive shift fork 7 are slidably connected to the guide shaft 8. The high / low shift fork 1 is provided with a roller 3, which is located in the arc-shaped groove A12 of the cam 5. The four-wheel drive shift fork 7 is provided with a pulley 14, which is located in the arc-shaped groove B13 of the cam 5.
[0023] In this embodiment, the transfer case shifting mechanism includes a high / low shift fork 1, a pin 2, a roller 3, a baffle 4, a cam 5, a shift shaft 6, a four-wheel drive shift fork 7, a guide shaft 8, a high / low gear sleeve 9, a planetary carrier 10, an input shaft 11, an arc-shaped groove A12, and an arc-shaped groove B13. The high / low shift fork 1 is mounted with a roller 3 via the pin 2, and the roller 3 can roll within the arc-shaped groove A12 of the cam 5. The shift shaft 6 is rigidly connected to the cam 5 via the baffle 4, forming a shift shaft assembly. The high / low shift fork 1 and the four-wheel drive shift fork 7 can slide on the guide shaft 8.
[0024] See attached document Figure 2-4 The four-wheel drive shift fork 7 is mounted in the arc-shaped groove B13 of the cam 5 via the pulley 14. The curvature of the arc-shaped outer surface of the cam 5 matches the axial movement distance of the four-wheel drive shift fork 7 on the guide shaft 8 during gear shifting.
[0025] See attached document Figure 1-4 The roller 3 is fixed to one end of the high / low shift fork 1 by the pin 2. The roller 3 is set in the arc groove A12 on the convex plate 5. The arc of the arc groove A12 matches the moving distance of the high / low shift fork 1 on the guide shaft 8 when shifting gears.
[0026] In use, cam 5 is rotatably connected to the transfer case housing via the shift shaft, and four-wheel drive shift fork 7 is connected to the corresponding gear in the transfer case via a synchronizer to control the switching between two-wheel drive and four-wheel drive. High-low shift fork 1 slides between input shaft 11 and planetary carrier 10 via high-low gear sleeve 9 splines to control the switching between high and low speeds.
[0027] See attached document Figure 3 , 6 8. When the high / low shift fork 1 rolls to the middle position of the arc groove A12 via the roller 3, the high / low gear sleeve 9 spline is located in the gap between the spline of the input shaft 11 and the spline of the planetary carrier 10, the transfer case loses power and achieves neutral.
[0028] See attached document Figure 4-8 During gear shifting, the shift shaft 6 drives the cam 5 to rotate, and the rotation of the cam 5 drives the four-wheel drive shift fork 7 and the height shift fork 1 to move axially, thereby realizing the switching between four gears: two-wheel drive high speed, four-wheel drive high speed, neutral, and four-wheel drive low speed. After adding a neutral gear to the transfer case, a power take-off unit can be added to the transfer case input shaft or the transmission to meet the needs of power take-off when parking.
Claims
1. An electrically controlled range shifter with a neutral, characterized by: The application relates to a high-low gear shift device, which comprises a high-low gear shift fork (1), a pin (2), a roller (3), a baffle (4), a cam (5), a gear shift shaft (6), a four-wheel drive gear shift fork (7) and a guide shaft (8), wherein the cam (5) is fixed on the gear shift shaft (6) through the baffle (4), the cam (5) is provided with an arc-shaped groove A (12) and an arc-shaped groove B (13), the high-low gear shift fork (1) and the four-wheel drive gear shift fork (7) are slidingly connected on the guide shaft (8), the high-low gear shift fork (1) is provided with the roller (3), the roller (3) is arranged in the arc-shaped groove A (12) of the cam (5), the four-wheel drive gear shift fork (7) is provided with a pulley (14), and the pulley (14) is arranged in the arc-shaped groove B (13) of the cam (5).
2. An electrically controlled range shifter with a neutral according to claim 1, characterized in that: The roller (3) is installed on the high-low gear shift fork (1) through the pin (2), and the roller (3) is rollingly arranged in the arc-shaped groove A (12) of the cam (5).
3. An electrically controlled range shifter mechanism with a neutral according to claim 2, characterized in that: The curvature of the arc-shaped groove A (12) is matched with the moving distance of the high-low gear shift fork (1) on the guide shaft (8) during gear shifting.
4. An electrically controlled range shifter mechanism with a neutral according to claim 1, characterized in that: The arc-shaped groove B (13) of the cam (5) is arranged on the outer surface of the cam (5), and the curvature is matched with the moving distance of the four-wheel drive gear shift fork (7) on the guide shaft (8) during gear shifting.
5. An electrically controlled range shifter mechanism with a neutral according to claim 1, characterized in that: The cam (5) is rotationally connected on a transfer case shell through the gear shift shaft (6), the four-wheel drive gear shift fork (7) is connected on corresponding gears of the transfer case through a synchronizer, and the high-low gear shift fork (1) is spline slidingly connected between an input shaft (11) and a planet carrier (10) through a high-low gear sleeve (9).