A four-wheel drive system

Abstract

A four-wheel drive system includes a front axle of a vehicle, a half shaft of the front axle being connected with a front axle main reducer, a torque manager being arranged in the front axle main reducer, a cam mechanism and a friction plate group being arranged in the torque manager, a rear axle of the vehicle, a half shaft of the rear axle being connected with a rear axle main reducer, the front axle main reducer and the rear axle main reducer being connected with a transfer case respectively, the transfer case being connected with the front axle main reducer through a front output shaft, the transfer case being connected with the rear axle main reducer through a rear output shaft, and an input shaft of the transfer case being connected with a transmission of the vehicle. The four-wheel drive system has a small space occupation and a fast torque response speed.

Description

Technical Field

[0001] This utility model relates to the field of automotive transmission technology, specifically to a four-wheel drive system. Background Technology

[0002] Four-wheel drive systems are broadly categorized into three types: part-time four-wheel drive, full-time four-wheel drive, and on-demand four-wheel drive. On-demand four-wheel drive automatically switches between two-wheel drive and four-wheel drive modes based on road conditions. Due to its advantages such as low fuel consumption, high transmission efficiency, fast response, and a superior driving experience, it has a wide range of applications. The torque manager is a core component of the four-wheel drive system. It automatically determines and precisely adjusts the torque distribution between the front and rear axles based on different driving modes and road conditions. By rationally distributing torque between the front and rear axles, the torque manager improves the vehicle's traction, off-road capability, and handling stability. When off-roading or encountering complex road conditions, it allows the vehicle to better cope with various challenges, maintain a stable driving state, and enhance the driver's sense of control.

[0003] Currently, torque managers are generally integrated into the transfer take-off or rear axle reducer. This arrangement of torque managers increases the space occupied by the four-wheel drive system, results in a long torque response time, and low transmission efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a four-wheel drive system. This four-wheel drive system occupies little space and has a fast torque response speed.

[0005] The purpose of this utility model is achieved by the following solution: a four-wheel drive system, including a front axle and a rear axle of a vehicle, wherein the half-shaft of the front axle is connected to the front axle final reducer, a torque manager is provided in the front axle final reducer, and a cam mechanism and friction plate assembly are provided in the torque manager; the half-shaft of the rear axle is connected to the rear axle final reducer; the front axle final reducer and the rear axle final reducer are respectively connected to a power take-off (PTO); the PTO is connected to the front axle final reducer via a front output shaft, and the PTO is connected to the rear axle final reducer via a rear output shaft; the input shaft of the PTO is connected to the vehicle's transmission.

[0006] The half-shaft of the front axle of the vehicle is connected to the front axle main reducer via a spline, and the half-shaft of the rear axle of the vehicle is connected to the rear axle main reducer via a spline.

[0007] The front and rear output shafts of the power take-off unit are hollow shafts.

[0008] The cam mechanism includes a driving cam, a driven cam, and a roller retainer. The driving cam is located at the upper end of the cam mechanism, the driven cam is located at the lower end of the cam mechanism, and the roller retainer is located between the driving cam and the driven cam.

[0009] The friction plate assembly includes a pair of steel plates and a friction plate, which are alternately arranged. The internal spline of the pair of steel plates is engaged with the external spline of the torque manager spline shaft, and the external spline of the friction plate is engaged with the internal spline of the torque manager cylindrical hub.

[0010] In the front axle main reducer, the external spline of the drive bevel gear shaft is engaged with the internal spline of the torque manager cylindrical hub, and the shaft end of the drive bevel gear shaft is engaged with the spline shaft of the torque manager through a needle roller bearing.

[0011] In the cam mechanism, the driving cam and the driven cam are provided with arc-shaped slides opposite each other, and the roller retainer is installed in the slides.

[0012] The torque manager has two teeth, an upper tooth and a lower tooth. The outer diameter of the upper tooth is smaller than that of the lower tooth. The upper tooth engages with the active cam in the cam mechanism, and the lower tooth engages with the motor gear.

[0013] The advantage of this invention is that the torque manager is integrated into the front axle final reducer. This solution has a simpler and more compact structure, saves space in the middle of the vehicle chassis, and is conducive to the optimization of the overall vehicle layout. At the same time, because the physical distance is closer, the path of power transmission to the front axle is shorter, the torque response is more direct, and the time is shorter. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the front axle main reducer. Figure 3 This is a schematic diagram of the torque manager structure. Detailed Implementation

[0015] like Figures 1 to 3As shown, a four-wheel drive system includes a front axle 1 and a rear axle 8. The half-shaft of the front axle 1 is connected to a front axle final drive 2 via a spline. A torque manager 3 is installed in the front axle final drive 2. The external spline of the drive bevel gear shaft in the front axle final drive 2 engages with the internal spline of the cylindrical hub of the torque manager 3. The shaft end of the drive bevel gear shaft engages with the splined shaft of the torque manager 3 via a needle roller bearing. A cam mechanism 3-2 and a friction plate assembly 3-1 are installed in the torque manager 3. The cam mechanism 3-2 includes a drive cam, a driven cam, and a roller retainer. The drive cam is located at the upper end of the cam mechanism 3-2, and the driven cam is located at the lower end. A roller retainer is located between the drive cam and the driven cam. The friction plate assembly 3-1 includes paired steel plates and friction plates, which are alternately arranged. The internal splines of the paired steel plates engage with the external splines of the torque manager's spline shaft, and the external splines of the friction plates engage with the internal splines of the torque manager's cylindrical hub. A motor drives the drive pinion to rotate, precisely controlling the cam mechanism's stroke and thus the pressure of the friction plates, thereby achieving torque distribution between the front and rear axles. The half-shaft of the rear axle 8 is connected to the rear axle final drive 7 via a spline. The front axle final drive 2 and the rear axle final drive 7 are respectively connected to the transfer case 5. The transfer case 5 is connected to the front axle final drive 2 via the front output shaft 4 and to the rear axle final drive 7 via the rear output shaft 6. The front output shaft 4 and the rear output shaft 6 of the transfer case 5 are hollow shafts. The input shaft of the transfer case 5 is connected to the vehicle's transmission. In the cam mechanism 3-2, the driving cam and the driven cam are provided with arc-shaped slideways 3-3. A roller retainer is installed in the slideway 3-3. When the driving cam drives the roller retainer assembly to rotate in the slideway, the driven cam can move a certain distance axially. The torque manager 3 has a double-toothed structure 3-4 with upper and lower teeth. The outer diameter of the upper tooth of the double-toothed structure 3-4 is smaller than that of the lower tooth. The upper tooth engages with the driving cam in the cam mechanism 3-2, and the lower tooth engages with the motor gear. The motor drives the double-toothed structure to rotate, which in turn drives the driving cam to rotate. By controlling the rotation angle of the driving cam, the movement distance of the driven cam can be controlled, thereby controlling the clamping degree of the friction plate assembly and, consequently, the distribution ratio of the front and rear torques.

[0016] When a car is driving on a highway at low or medium speeds, the basic torque distribution ratio is 0:100, meaning it is primarily rear-wheel drive. When the rear wheels slip, the torque distribution range can be from 0:100 to 50:50. Depending on the vehicle and road conditions, up to 50% of the torque can be distributed to the front wheels, greatly improving the vehicle's ability to get out of trouble and its handling performance. At the same time, this four-wheel drive system can work in conjunction with the vehicle's ESP and other safety systems, using torque distribution between the front and rear axles to prevent wheel slippage and loss of control, thus improving the vehicle's safety performance.

[0017] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A four-wheel drive system, comprising a front axle (1) and a rear axle (8), characterized in that: The half-shaft of the front axle (1) of the vehicle is connected to the front axle main reducer (2). The front axle main reducer (2) is equipped with a torque manager (3). The torque manager (3) is equipped with a cam mechanism (3-2) and a friction plate group (3-1). The half-shaft of the rear axle (8) of the vehicle is connected to the rear axle main reducer (7). The front axle main reducer (2) and the rear axle main reducer (7) are respectively connected to the transfer power take-off (5). The transfer power take-off (5) is connected to the front axle main reducer (2) through the front output shaft (4). The transfer power take-off (5) is connected to the rear axle main reducer (7) through the rear output shaft (6). The input shaft of the transfer power take-off (5) is connected to the vehicle gearbox.

2. The four-wheel drive system according to claim 1, characterized in that: The half-shaft of the front axle (1) of the vehicle is connected to the front axle main reducer (2) via a spline, and the half-shaft of the rear axle (8) of the vehicle is connected to the rear axle main reducer (7) via a spline.

3. The four-wheel drive system according to claim 1, characterized in that: The front output shaft (4) and rear output shaft (6) of the power take-off unit (5) are hollow shafts.

4. The four-wheel drive system according to claim 1, characterized in that: The cam mechanism (3-2) includes a driving cam, a driven cam, and a roller retainer. The driving cam is provided at the upper end of the cam mechanism (3-2), the driven cam is provided at the lower end of the cam mechanism, and the roller retainer is provided between the driving cam and the driven cam.

5. The four-wheel drive system according to claim 1, characterized in that: The friction plate group (3-1) includes a pair of steel plates and a friction plate, which are alternately arranged. The internal spline of the pair of steel plates is engaged with the external spline of the torque manager spline shaft, and the external spline of the friction plate is engaged with the internal spline of the torque manager cylindrical hub.

6. The four-wheel drive system according to claim 1, characterized in that: The external spline of the drive bevel gear shaft in the front axle main reducer (2) is engaged with the internal spline of the cylindrical hub of the torque manager, and the shaft end of the drive bevel gear shaft is engaged with the spline shaft of the torque manager (3) through a needle roller bearing.

7. The four-wheel drive system according to claim 1, characterized in that: In the cam mechanism (3-2), the driving cam and the driven cam are provided with arc-shaped slides (3-3) opposite to each other, and the roller retainer is installed in the slides (3-3).

8. The four-wheel drive system according to claim 1, characterized in that: The double tooth (3-4) of the torque manager (3) consists of two teeth, an upper tooth and a lower tooth. The outer diameter of the upper tooth of the double tooth (3-4) is smaller than that of the lower tooth. The upper tooth engages with the active cam in the cam mechanism (3-2), and the lower tooth engages with the motor gear.

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