A three-point support tractor full-suspension and full-wheel braking system

Abstract

This invention discloses a three-point tractor with full suspension and all-wheel braking system, aiming to provide a system that improves the overall driving comfort of the three-point tractor to meet higher customer demands. It includes: a steering bracket assembly mounted on a slewing bearing of the chassis; a front wheel mounting bracket rotatably mounted on the steering bracket assembly via a pin; a front wheel damping system including a front wheel shock absorber connecting the front wheel mounting bracket and the steering bracket assembly; and a rear wheel damping system including a rubber spring and a damper mounted on the chassis. The chassis is supported on the drive axle housing by the rubber spring, and the drive axle housing has a damper connection part connected to the damper via drive axle fixing bolts.

Description

Technical Field

[0001] This invention relates to the field of three-point tractor vehicles, and more specifically to a three-point tractor vehicle with full suspension and all-wheel braking system. Background Technology

[0002] With the development of the logistics industry and the increasing environmental protection requirements, three-point tractor units are favored by customers for their compact size and maneuverability, leading to a growing market demand. However, most three-point tractor units on the market currently use the rear wheels as drive wheels and the front wheels as driven wheels. The front wheels, as driven wheels, lack shock absorption, resulting in poor overall driving comfort and increased operator fatigue. Furthermore, braking in three-point tractor units only applies to the drive wheels, resulting in a longer braking distance. Simultaneously, the travel speed of three-point tractor units is limited by the lack of all-wheel braking and full-suspension suspension, hindering speed increases and limiting both driving comfort and safety, thus failing to meet higher customer demands. Summary of the Invention

[0003] The primary objective of this invention is to provide a three-point tractor with full suspension and all-wheel braking system that can improve the overall driving comfort of the vehicle and meet the higher usage requirements of customers.

[0004] The second objective of this invention is to provide a three-point tractor with full suspension and all-wheel braking system that can shorten the braking distance of the three-point tractor, thereby effectively solving the problem of the driving speed of the three-point tractor being restricted by the excessively long braking distance, improving the driving speed and overall vehicle safety, and meeting the higher usage requirements of customers.

[0005] The technical solution of this invention is:

[0006] A three-point tractor with full suspension and all-wheel braking system, comprising:

[0007] Steering bracket assembly, the steering bracket assembly is mounted on the slewing bearing of the chassis;

[0008] The front wheel mounting bracket is rotatably mounted on the steering bracket assembly via a pin.

[0009] A front wheel damping system, comprising a front wheel damper connecting the front wheel mounting bracket and the steering bracket assembly;

[0010] The rear wheel shock absorption system includes a rubber auxiliary spring and a damper mounted on the frame. The frame is supported on the drive axle housing by the rubber auxiliary spring. The drive axle housing has a damper connection part, which is connected to the damper by drive axle fixing bolts. In this solution, the front wheels of the three-point tractor's fully suspended and all-wheel braking system achieve height and vertical shock absorption through the front wheel shock absorption system; the rear wheels achieve height and vertical shock absorption through the rubber auxiliary spring and damper of the rear wheel shock absorption system. This achieves full suspension of the front and rear wheels at three points, effectively mitigating the impact on the entire vehicle and improving the overall driving comfort of the three-point tractor to meet higher customer demands.

[0011] Preferably, the front wheel damping system also includes a damping pad, which is installed on the side of the steering bracket assembly facing the front wheel mounting bracket. The damping pad is positioned above the front wheel mounting bracket and is used to limit the ultimate travel of the front wheel shock absorber. In this way, the damping pad limits the ultimate travel of the front wheel shock absorber, ensuring that the front wheel shock absorber is only subjected to forces within its damping travel range, thus extending its service life and reducing the risk of damage. Simultaneously, the damping pad itself has segmented damping, which, in conjunction with the front wheel shock absorber, can absorb the impact of large undulations and potholes on the entire front wheel damping and braking system.

[0012] Preferably, the front wheel shock absorber includes a gas spring and a damping spring sleeved outside the gas spring. The lower end of the gas spring is connected to the front wheel mounting bracket, and the upper end of the gas spring is connected to the steering bracket assembly. The damping spring and the gas spring have different damping, ensuring the filtering of small bumps and large undulations on the road surface, thereby further improving the overall driving comfort of the vehicle and greatly increasing the driving comfort.

[0013] Preferably, the steering bracket assembly is provided with a pin hole, the pin is rotatably disposed in the pin hole, and a spacer is provided between the pin hole and the pin, the spacer being fitted onto the pin.

[0014] Preferably, the vehicle frame is provided with a buffer mounting cavity, the buffer is installed in the buffer mounting cavity, and the drive axle fixing bolt passes through the buffer connection and the buffer.

[0015] Preferably, the rubber auxiliary spring is fixed to the vehicle frame by rubber auxiliary spring mounting bolts. The bottom surface of the rubber auxiliary spring has a rubber auxiliary spring limiting hole, and the drive axle housing has a drive axle limiting post, which is inserted into the rubber auxiliary spring limiting hole. This facilitates the installation of the rubber auxiliary spring and, moreover, the drive axle limiting post limits the travel of the rear wheel shock absorber system, preventing the rubber auxiliary spring from being compressed indefinitely and damaged, thus protecting the rubber auxiliary spring and extending its service life.

[0016] Preferably, a braking system is also included, comprising:

[0017] The front wheel brake is mounted on the front wheel mounting bracket, and the front wheels of the tractor are mounted on the front wheel brake.

[0018] The rear wheel brakes are mounted on the ends of the drive axle, and the rear wheels of the tractor are also mounted on them. This allows for braking of the front wheels via the front wheel brakes and the rear wheels via the rear wheel brakes, achieving full-wheel braking at three points (front, rear, and lateral). This increases the tractor's speed while simultaneously shortening the braking distance, effectively addressing the issue of excessively long braking distances that limit the speed of three-point tractors. This improves both speed and overall vehicle safety, meeting higher customer demands.

[0019] Preferably, the braking system also includes a master cylinder and a three-way proportional valve. The master cylinder and the inlet of the three-way proportional valve are connected via a main hydraulic line. The front wheel brakes are connected to one outlet of the three-way proportional valve via a front wheel brake line, and the rear wheel brakes are connected to the other outlet of the three-way proportional valve via a rear wheel brake line. When the tractor brakes, the master cylinder delivers brake fluid to the three-way proportional valve via the main hydraulic line. The three-way proportional valve then forces the brake fluid through the rear wheel brake lines and the front wheel brake lines into the front and rear wheel brakes, causing the brakes to generate braking force and achieving all-wheel braking at three points on both the front and rear wheels.

[0020] Preferably, the shock absorber spring and gas spring are equipped with a front pressure sensor at their top, which monitors the front axle load pressure of the tractor in real time. The rubber auxiliary spring contains a rear pressure sensor, which monitors the rear axle load pressure of the tractor in real time. During braking, the front and rear axle load pressures shift and change in real time. The front and rear pressure sensors monitor these pressures and send them to a three-way proportional valve. The valve distributes the braking force between the front and rear wheels based on the received pressure signals, ensuring that the ratio of braking force distributed to the front and rear wheels is the same as the ratio of the front axle load pressure to the rear axle load pressure. This not only ensures synchronized braking of the front and rear wheels but also allows for real-time adjustment of the braking force based on the axle load pressure, achieving precise control of the braking force distribution and improving braking efficiency, thereby effectively shortening the braking distance.

[0021] As a preferred option, the braking system also includes an electromagnetic brake. When the vehicle speed drops to a preset value, the electromagnetic brake automatically engages, achieving automatic parking and eliminating the cumbersome operation of the mechanical handbrake, as well as the potential vehicle safety accidents that may occur if the handbrake is forgotten to be engaged.

[0022] The beneficial effects of this invention are:

[0023] Firstly, it can improve the overall driving comfort of the three-point tractor, in order to meet the higher usage needs of customers.

[0024] Secondly, it achieves all-wheel braking at three points on the front and rear wheels, which not only increases the speed of the tractor but also shortens the braking distance of the three-point tractor. This effectively solves the problem of the tractor's speed being limited by the long braking distance, improves the speed and overall driving safety, and meets the higher usage needs of customers.

[0025] Thirdly, the three-way proportional valve can distribute the braking force between the front and rear wheels in real time based on the received axle load pressure signals. Furthermore, the ratio of the braking force distributed to the front and rear wheels is the same as the ratio of the front axle load pressure to the rear axle load pressure. This allows for real-time adjustment of the braking force between the front and rear wheels based on the axle load pressure, achieving precise control of the braking force distribution, improving braking efficiency, and effectively shortening the braking distance. Attached Figure Description

[0026] Figure 1 This is a partial structural diagram of the front wheel shock absorption system of a three-point tractor with full suspension and all-wheel braking system according to the present invention.

[0027] Figure 2 This is a partial cross-sectional structural diagram of the steering bracket assembly, front wheel mounting bracket and front wheel shock absorption system of the present invention.

[0028] Figure 3 yes Figure 1 A schematic diagram of a partial cross-sectional structure at point AA.

[0029] Figure 4 This is a partial structural diagram of the rear wheel shock absorption system of a three-point tractor with full suspension and all-wheel braking system according to the present invention.

[0030] Figure 5 This is a partial bottom view of the drive axle of a three-point tractor with full suspension and all-wheel braking system according to the present invention.

[0031] Figure 6 This is a bottom view of a three-point tractor with full suspension and all-wheel braking system according to the present invention (the front and rear wheels are not shown in the figure).

[0032] Figure 7 This is a side view of a three-point tractor with full suspension and all-wheel braking system according to the present invention.

[0033] In the picture:

[0034] Steering bracket assembly 1;

[0035] Frame 2, slewing bearing 2.0;

[0036] Front wheel mounting bracket 3;

[0037] Pin 4, pin fixing bolt 4.1, spacer 4.2;

[0038] 5. Front wheel shock absorption system, 5.1. Gas spring, 5.2. Shock absorber spring, 5.3. Shock absorber pad, 5.4. Front pressure sensor;

[0039] Front wheel 6;

[0040] Front wheel brakes 7;

[0041] 8. Rear wheel shock absorption system; 8.1. Rubber auxiliary spring; 8.2. Rubber auxiliary spring mounting bolt; 8.3. Rear pressure sensor; 8.4. Buffer; 8.5. Drive axle fixing bolt;

[0042] Drive axle 9, drive axle limiting post 9.1, buffer connection part 9.2;

[0043] Rear wheel 10;

[0044] Rear wheel brake 11;

[0045] Three-way proportional valve 12;

[0046] Main oil pipe 13;

[0047] Front wheel brake line 14;

[0048] Rear wheel brake hose 15. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0050] Specific Implementation Example 1, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a three-point tractor with full suspension and all-wheel braking system includes a frame 2, a steering bracket assembly 1, a front wheel mounting bracket 3, a front wheel shock absorption system 5, and a rear wheel shock absorption system 8. In this embodiment, the tractor includes one front wheel 6 and two rear wheels 10. The steering bracket assembly 1 is mounted on a slewing bearing 2.0 of the frame. Specifically, the slewing bearing is fixed to the frame mounting plate of the frame by slewing bearing fixing bolts, and the steering bracket assembly is fixed to the slewing bearing by steering bracket fixing bolts.

[0051] The front end of the front wheel mounting bracket 1 is rotatably mounted on the steering bracket assembly 1 via a pin 4. In this embodiment, the steering bracket assembly has a pin hole, and the pin is rotatably mounted in the pin hole. The pin is connected to the front end of the front wheel mounting bracket, and a spacer 4.2 is provided between the pin hole and the pin, with the spacer fitted onto the pin. The pin is connected to the steering bracket assembly using a pin fixing bolt 4.1.

[0052] The front wheel damping system 5 includes a front wheel shock absorber. The front wheel shock absorber connects the rear end of the front wheel mounting bracket to the steering bracket assembly. The front wheel shock absorber includes a gas spring 5.1 and a damping spring 5.2. The lower end of the gas spring is connected to the rear end of the front wheel mounting bracket, and the upper end of the gas spring is connected to the steering bracket assembly. The damping spring is a damping spring sleeved outside the gas spring.

[0053] The rear wheel shock absorption system 8 includes a rubber auxiliary spring 8.1 and a buffer 8.4 mounted on the frame. The frame 2 is supported on the housing of the drive axle 9 by the rubber auxiliary spring 8.1. The frame has a buffer mounting cavity, and the buffer 8.4 is installed in the buffer mounting cavity. The drive axle housing has a buffer connecting part 9.2. The buffer connecting part is connected to the buffer by a drive axle fixing bolt 8.5. Specifically, the drive axle fixing bolt passes through the buffer connecting part and the buffer, connecting the buffer connecting part and the buffer together. In this embodiment, there are two rubber auxiliary springs, each corresponding to one of the rear wheels, with the rubber auxiliary springs close to the corresponding rear wheel. The buffer connecting part is a fan-shaped plate, which is integrated with the drive axle housing.

[0054] In this embodiment, the three-point tractor's fully suspended and all-wheel braking system, during operation, achieves height and dynamic shock absorption by compressing the air springs and damping springs of the front wheel shock absorber system. The front wheels and their mounting brackets rotate around a pivot pin, improving overall ride comfort. Simultaneously, the varying damping of the damping springs and air springs ensures effective filtering of minor bumps and large potholes, further enhancing ride comfort. The rear wheels, through the rubber springs and dampers of the rear wheel shock absorber system, achieve height and dynamic shock absorption, mitigating impacts on the entire rear wheel suspension system. By combining the front and rear wheel shock absorbers, a three-point fully suspended suspension is achieved, effectively reducing impacts on the vehicle and significantly improving overall ride comfort to meet higher customer demands.

[0055] Furthermore, such as Figure 1 , Figure 2As shown, the front wheel damping system 5 also includes a damping pad 5.3. The damping pad is positioned on the lower side of the steering bracket assembly facing the front wheel mounting bracket, above the front wheel mounting bracket, and is used to limit the extreme travel of the front wheel shock absorber. In this way, the extreme travel of the front wheel shock absorber can be limited by the damping pad, ensuring that the front wheel shock absorber is only subjected to forces within its damping travel range, thus guaranteeing the service life of the front wheel shock absorber and preventing damage. Simultaneously, the damping pad itself has segmented damping, which, in conjunction with the front wheel shock absorber, can absorb the impact of large undulations and potholes on the entire front wheel damping and braking system.

[0056] Furthermore, such as Figure 4 As shown, the rubber auxiliary spring 8.1 is fixed to the vehicle frame by the rubber auxiliary spring mounting bolt 8.2. The bottom surface of the rubber auxiliary spring has a rubber auxiliary spring limiting hole. The drive axle housing has an upwardly extending drive axle limiting post 9.1. The drive axle limiting post is inserted into the rubber auxiliary spring limiting hole. This facilitates the installation of the rubber auxiliary spring and, moreover, limits the travel of the rear wheel shock absorber system, preventing the rubber auxiliary spring from being compressed indefinitely and damaged, thus protecting the rubber auxiliary spring and extending its service life.

[0057] In this second specific embodiment, the remaining structure is the same as in the first specific embodiment, except that...

[0058] like Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, a three-point tractor with full suspension and all-wheel braking system further includes a braking system. The braking system includes front wheel brakes 7 and rear wheel brakes 11. The front wheel brakes 7 are mounted on the front wheel mounting bracket 3, and the front wheels 6 of the tractor are mounted on the front wheel brakes via front wheel bolts. The rear wheel brakes 11 are mounted on the ends of the drive axle 9. In this embodiment, there are two rear wheel brakes, each mounted on one end of the drive axle. The rear wheels 10 of the tractor are mounted on the rear wheel brakes. Thus, the front wheels can be braked by the front wheel brakes, and the rear wheels by the rear wheel brakes, achieving all-wheel braking at three points. This allows the tractor to increase its speed while shortening the braking distance, effectively solving the problem of excessively long braking distances limiting the speed of the three-point tractor, improving speed and overall vehicle driving safety to meet higher customer demands.

[0059] Furthermore, the braking system also includes an electromagnetic brake. When the vehicle speed drops to a preset value, the electromagnetic brake automatically engages, achieving automatic parking and eliminating the cumbersome operation of the mechanical handbrake, as well as the potential vehicle safety accidents that may occur if the handbrake is forgotten to be engaged.

[0060] Furthermore, such as Figure 6 , Figure 7 As shown, the braking system also includes a master cylinder and a three-way proportional valve 12. The master cylinder and the inlet of the three-way proportional valve are connected via a main oil pipe 13. The front wheel brakes are connected to one outlet of the three-way proportional valve via a front wheel brake oil pipe 14. The rear wheel brakes are connected to the other outlet of the three-way proportional valve via a rear wheel brake oil pipe 15. When the tractor brakes, the master cylinder delivers brake fluid to the three-way proportional valve via the main oil pipe. The three-way proportional valve then forces the brake fluid through the rear wheel brake oil pipe and the front wheel brake oil pipe into the front and rear wheel brakes, causing the brakes to generate braking force and achieving all-wheel braking at three points on the front and rear wheels.

[0061] like Figure 1 , Figure 4 As shown, the shock absorber spring and gas spring are equipped with a front pressure sensor 5.4 at their tops. This front pressure sensor monitors the front axle load pressure of the tractor in real time. The front axle load pressure refers to the load pressure exerted by the tractor on the front wheels. The rubber auxiliary spring 8.1 contains a rear pressure sensor 8.3, which monitors the rear axle load pressure (rear axle, i.e., drive axle) of the tractor in real time. The rear axle load pressure refers to the load pressure exerted by the tractor on the rear wheels.

[0062] During the braking process of the tractor, the axle load pressure shifts between the front and rear axles, causing real-time changes in axle load pressure. Front and rear pressure sensors monitor the axle load pressure in real time and send these signals to a three-way proportional valve. Based on the received axle load pressure signals, the three-way proportional valve distributes braking force to the front and rear wheels in real time, ensuring that the ratio of braking force distributed to the front and rear wheels is the same as the ratio of the front axle load pressure to the rear axle load pressure. This not only ensures synchronized braking of the front and rear wheels but also allows for real-time adjustment of the braking force based on the axle load pressure, achieving precise control of the braking force distribution, improving braking efficiency, and effectively shortening the braking distance.

[0063] In this embodiment, each wheel of the tractor is equipped with a wheel speed sensor. During the braking process of the tractor, the wheel speed sensor monitors the rotational speed of each wheel in real time. When the wheel speed sensor detects that the rotational speed of a certain wheel is zero or decreases to a set value, the braking force distributed to that wheel is proportionally reduced to prevent that wheel from locking up. This avoids a situation where one wheel locks up and the other wheel has insufficient braking force, and the vehicle will not lose control.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A three-point tractor with full suspension and all-wheel braking system, characterized in that, include: The steering bracket assembly is mounted on the slewing bearing of the chassis; The front wheel mounting bracket is rotatably mounted on the steering bracket assembly via a pin. The front wheel damping system includes a front wheel shock absorber that connects the front wheel mounting bracket and the steering bracket assembly; The rear wheel shock absorption system includes a rubber auxiliary spring and a damper mounted on the frame. The frame is supported on the drive axle housing by the rubber auxiliary spring. The drive axle housing is provided with a damper connection part, and the damper connection part is connected to the damper by the drive axle fixing bolts. Braking system, including: The front wheel brake is mounted on the front wheel mounting bracket, and the front wheel is mounted on the front wheel brake. The rear wheel brake is mounted on the end of the drive axle, and the rear wheels are mounted on the rear wheel brake. The master cylinder and the three-way proportional valve are connected via a main oil pipe. The front wheel brakes are connected to one outlet of the three-way proportional valve via a front wheel brake oil pipe, and the rear wheel brakes are connected to the other outlet of the three-way proportional valve via a rear wheel brake oil pipe. The shock absorber spring and gas spring are equipped with front pressure sensors, and the rubber auxiliary spring is equipped with a rear pressure sensor. During the braking process of the tractor, the front and rear pressure sensors monitor the axle load pressure of the tractor in real time. The three-way proportional valve distributes the braking force of the front and rear wheels in real time according to the received axle load pressure signals. The ratio of the braking force distributed to the front and rear wheels by the three-way proportional valve is the same as the ratio of the axle load pressure of the front axle to the axle load pressure of the rear axle.

2. The three-point tractor full suspension and all-wheel braking system according to claim 1, characterized in that, The front wheel damping system also includes a damping pad, which is disposed on the side of the steering bracket assembly facing the front wheel mounting bracket. The damping pad is located above the front wheel mounting bracket and is used to limit the extreme travel of the front wheel shock absorber.

3. The three-point tractor full suspension and all-wheel braking system according to claim 1, characterized in that, The front wheel shock absorber includes a gas spring and a damping spring sleeved outside the gas spring. The lower end of the gas spring is connected to the front wheel mounting bracket, and the upper end of the gas spring is connected to the steering bracket assembly.

4. A three-point tractor with full suspension and all-wheel braking system according to claim 1, 2, or 3, characterized in that, The steering bracket assembly is provided with a pin hole, and the pin is rotatably disposed in the pin hole.

5. The three-point tractor full suspension and all-wheel braking system according to claim 4, characterized in that, A spacer is provided between the pin hole and the pin, and the spacer is fitted onto the pin.

6. A three-point tractor with full suspension and all-wheel braking system according to claim 1, 2, or 3, characterized in that, The frame is provided with a buffer mounting cavity, and the buffer is installed in the buffer mounting cavity.

7. A three-point tractor with full suspension and all-wheel braking system according to claim 6, characterized in that, The drive axle fixing bolt passes through the buffer connection and the buffer.

8. A three-point tractor with full suspension and all-wheel braking system according to claim 1, 2, or 3, characterized in that, The rubber auxiliary spring is fixed to the vehicle frame by rubber auxiliary spring mounting bolts. The bottom surface of the rubber auxiliary spring is provided with a rubber auxiliary spring limiting hole. The drive axle housing is provided with a drive axle limiting post, which is inserted into the rubber auxiliary spring limiting hole.

9. A three-point tractor with full suspension and all-wheel braking system according to claim 1, 2, or 3, characterized in that, The braking system also includes an electromagnetic brake.

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