A transverse and longitudinal movement quick switching mechanism suitable for a four-wheel drive vehicle

Abstract

This utility model discloses a rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles, relating to the field of automotive chassis structure technology. The mechanism includes: four drive wheel seats, each corresponding to one of the four drive wheels of the four-wheel drive vehicle and hinged to the chassis; a first lead screw and a second lead screw, mounted on the chassis and configured to rotate synchronously; a first lead screw nut and a second lead screw nut, respectively rotatably connected to the first and second lead screws; and four connecting rods, each hinged to one of the four drive wheel seats, wherein the other ends of two connecting rods are hinged to the first lead screw nut, and the other two connecting rods are hinged to the second lead screw nut. When the first and second lead screws rotate synchronously, the first and second lead screw nuts move along the first and second lead screws respectively, driving all drive wheel seats to rotate synchronously around their axes via the connecting rods, thus achieving switching between lateral and longitudinal movement of all drive wheels.

Description

Technical Field

[0001] This utility model relates to the field of automotive chassis structure technology, specifically to a rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles. Background Technology

[0002] Currently, four-wheel drive vehicles generally use either Ackermann steering or Mecanum steering. The former has the disadvantage of a larger turning radius, while the latter has the disadvantage of easy wear on the drive wheels.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] Purpose of the utility model: The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a quick switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles, which aims to achieve a smaller turning radius and reduce wear on the drive wheels.

[0005] To solve the above-mentioned technical problems, this utility model discloses a rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles, which includes:

[0006] Four drive wheel seats are provided, each corresponding to one of the four drive wheels of the four-wheel drive vehicle, and are respectively hinged to the chassis of the four-wheel drive vehicle;

[0007] The first lead screw and the second lead screw are mounted on the chassis and configured to rotate synchronously.

[0008] Rotate the first lead screw nut and the second lead screw nut that are respectively connected to the first lead screw and the second lead screw;

[0009] And four connecting rods, which are hinged to the four drive wheel seats one by one, wherein the other end of two of the connecting rods is hinged to the first lead screw nut, and the other end of the other two connecting rods is hinged to the second lead screw nut;

[0010] When the first lead screw and the second lead screw are synchronized, the first lead screw nut and the second lead screw nut move along the first lead screw and the second lead screw respectively. Through the connecting rod, all the drive wheel seats are driven to rotate synchronously around their axes, thereby realizing the switching between lateral and longitudinal movement of all the drive wheels.

[0011] This invention achieves synchronous rotation of the four drive wheel seats, thus preventing displacement of the four-wheel drive chassis during lateral and longitudinal movement. Theoretically, the turning radius is zero, or only a small turning radius occurs. Furthermore, compared to Mecanum wheel designs, the drive wheels roll around their drive wheel seats, eliminating the need for lateral sliding and significantly reducing drive wheel wear, resulting in a simpler mechanical structure.

[0012] In some embodiments, the first lead screw and the second lead screw rotate in opposite directions; correspondingly, adjacent drive wheel seats are symmetrically distributed along the circumferential direction of the center of the four drive wheels.

[0013] In this embodiment, when switching the driving direction of all drive wheels, the center position of the four drive wheels remains unchanged, meaning that the chassis will theoretically not be displaced, and the theoretical turning radius is zero.

[0014] Specifically, when the first lead screw and the second lead screw rotate synchronously in opposite directions, the first lead screw nut and the second lead screw nut move towards or away from each other.

[0015] Specifically, the first lead screw is a left-hand lead screw and the second lead screw is a right-hand lead screw, or the first lead screw is a right-hand lead screw and the second lead screw is a left-hand lead screw.

[0016] In other embodiments, the first lead screw and the second lead screw have the same direction of rotation; correspondingly, the two drive wheel seats connected to the first lead screw via the connecting rod are symmetrically distributed about the first lead screw, and the two drive wheel seats connected to the second lead screw via the connecting rod are symmetrically distributed about the second lead screw.

[0017] Specifically, when the first lead screw and the second lead screw rotate in the same direction and move synchronously, the first lead screw nut and the second lead screw nut reciprocate in the same direction.

[0018] Specifically, the first lead screw and the second lead screw are respectively provided with limiters for limiting the rotational stroke of the drive wheel seat to ensure that all the drive wheels switch between lateral and longitudinal movement. The limiters are electronic limiters or mechanical limiters.

[0019] Furthermore, it also includes a commutation drive motor, with the first lead screw and the second lead screw respectively connected to both ends of the same commutation drive motor to achieve synchronous driving by the commutation drive motor.

[0020] Specifically, the reversing drive motor is located at the center of the four drive wheels and fixed to the chassis of the four-wheel drive vehicle.

[0021] Specifically, the commutation drive motor is configured to be powered by a 24V DC mobile power supply.

[0022] In some embodiments, at least one of the four drive wheel seats, the first lead screw, the second lead screw, the first lead screw nut, the second lead screw nut, and the four connecting rods is made of a lightweight, high-strength structural material.

[0023] Beneficial effects:

[0024] 1. The present invention provides a rapid switching mechanism for lateral and longitudinal movement of four-wheel drive vehicles. By setting the first lead screw and the second lead screw to be linked synchronously, the four drive wheels can be turned synchronously, avoiding tire wear caused by asynchronous turning of the drive wheels. Specifically, in some embodiments, the first lead screw and the second lead screw are driven by the same reversing drive motor, resulting in better synchronization.

[0025] 2. By setting a suitable transmission ratio between the lead screw and the lead screw nut, as well as a suitable drive motor speed and torque, the horizontal and vertical switching can be completed in a short time.

[0026] 3. By setting the first lead screw and the second lead screw to rotate in opposite directions, correspondingly, along the circumference of the center of position of the four drive wheels, the adjacent two drive wheel seats are symmetrically distributed, so that when switching the driving direction of all drive wheels, the center position of the four drive wheels remains unchanged, that is, the chassis will theoretically not be displaced, and the theoretical turning radius is zero.

[0027] 4. Compared to configuring an independent motor for each lead screw and having the control system achieve electronic synchronization of the two independent motors, this embodiment uses a commutator drive motor to synchronously drive the first and second lead screws. The synchronous linkage of the two lead screws is achieved through mechanical hard connection, which can avoid the risk of electronic synchronization losing synchronization under extreme conditions. At the same time, the structure is simple, the cost is low, the control is simplified, and the space layout is better.

[0028] 5. By setting electronic or mechanical limiters on the first lead screw and the second lead screw respectively, the rotation angle can be fixed, thereby fixing the driving direction. Attached Figure Description

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0030] Figure 1 A schematic diagram of the structure of a rapid switching mechanism for lateral and longitudinal movement of a four-wheel drive vehicle when it is in longitudinal movement, provided as a first embodiment of the present invention;

[0031] Figure 2This is a schematic diagram of the structure of a lateral and longitudinal movement quick switching mechanism for a four-wheel drive vehicle in the lateral movement phase, as provided in the first embodiment of the present invention.

[0032] The reference numerals in the attached diagram are as follows: 1. Reversing drive motor; 2. First lead screw nut; 3. First lead screw; 4. Chassis; 5. Drive wheel; 6. Second lead screw; 7. Second lead screw nut; 8. Drive wheel seat; 9. Connecting rod. Detailed Implementation

[0033] The existing Ackermann steering mechanism steers by changing the direction of travel of the two drive wheels on the front side of the chassis. The drive wheels on the rear side of the chassis cannot (or can only change the direction of travel to a small extent), resulting in a large turning radius of the chassis (usually 3 to 4 times the wheelbase). The existing Mecanum wheel steering mechanism steers by using small rollers mounted on the hub of the Mecanum wheel. It is prone to wear on uneven and high-friction surfaces and has low load-bearing capacity.

[0034] In view of the above situation, this utility model provides a quick switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles, which has the advantages of simple mechanical structure, small turning radius (the turning radius can theoretically even be zero) and high wear resistance.

[0035] The lateral and longitudinal movement quick switching mechanism for four-wheel drive vehicles provided by this utility model includes: four drive wheel seats 8, which are arranged one-to-one with the four drive wheels 5 of the four-wheel drive vehicle and are respectively hinged to the chassis 4; a first lead screw 3 and a second lead screw 6, which are arranged on the chassis 4 and configured to rotate synchronously; a first lead screw nut 2 and a second lead screw nut 7, which are respectively rotatably connected to the first lead screw 3 and the second lead screw 6; and four connecting rods 9, which are hinged one-to-one with the four drive wheel seats 8, wherein the other ends of two connecting rods 9 are respectively hinged to the first lead screw nut 2, and the other ends of the other two connecting rods 9 are respectively hinged to the second lead screw nut 7.

[0036] When the first lead screw 3 and the second lead screw 6 move synchronously, the first lead screw nut 2 and the second lead screw nut 7 move along the first lead screw 3 and the second lead screw 6 respectively. Through the connecting rod 9, all drive wheel seats 8 are driven to rotate synchronously around their axes, thereby realizing the switching between lateral and longitudinal movement of all drive wheels 5.

[0037] In some embodiments, the first lead screw 3 and the second lead screw 6 have the same rotation direction, while in other embodiments, the first lead screw 3 and the second lead screw 6 have different rotation directions.

[0038] In this application, when all drive wheels 5 move laterally, the four-wheel drive vehicle to which they are located enters a lateral driving mode; when the drive wheels 5 move longitudinally, the four-wheel drive vehicle to which they are located enters a longitudinal driving mode.

[0039] Example 1

[0040] Figure 1 This is an example diagram of a rapid switching mechanism for lateral and longitudinal movement suitable for a four-wheel drive vehicle, mounted on a chassis according to an exemplary embodiment of the present disclosure. Figure 1 The middle arrow indicates the vertical direction of movement.

[0041] like Figure 1 As shown, the lateral and longitudinal movement quick switching mechanism for four-wheel drive vehicles provided in this embodiment includes four drive wheel seats 8, a first lead screw 3, a second lead screw 6, a first lead screw nut 2, a second lead screw nut 7, and four connecting rods 9. The four drive wheel seats 8 are arranged one-to-one with the four drive wheels 5 of the four-wheel drive vehicle; each drive wheel seat 8 is hinged to the chassis 4. The first lead screw 3 and the second lead screw 6 are mounted on the chassis 4 and configured to rotate synchronously. The first lead screw nut 2 and the second lead screw nut 7 are rotatably connected to the first lead screw 3 and the second lead screw 6, respectively. The four connecting rods 9 are hinged one-to-one with the four drive wheel seats 8, wherein the other ends of two connecting rods 9 are hinged to the first lead screw nut 2, and the other ends of the other two connecting rods 9 are hinged to the second lead screw nut 7.

[0042] When the first lead screw 3 and the second lead screw 6 rotate in opposite directions and move synchronously, the first lead screw nut 2 and the second lead screw nut 7 move towards or away from each other, and through the connecting rod 9, drive all drive wheel seats 8 to rotate synchronously around their axes, thereby realizing the switching between lateral and longitudinal movement of all drive wheels 5.

[0043] The rapid switching mechanism for lateral and longitudinal movement in this embodiment also includes a reversing drive motor 1, which is located at the center of the four drive wheels 5 and fixed to the chassis 4 of the four-wheel drive vehicle; the first lead screw 3 and the second lead screw 6 are respectively connected to the two ends of the same reversing drive motor 1 to achieve synchronous driving by the reversing drive motor 1.

[0044] Compared to configuring an independent motor for each lead screw and having the control system achieve electronic synchronization of the two independent motors, this embodiment uses a commutator drive motor 1 to synchronously drive the first lead screw 3 and the second lead screw 6. The synchronous linkage of the two lead screws is achieved through mechanical hard connection, which can avoid the risk of electronic synchronization losing synchronization under extreme conditions. It also has a simple structure, low cost, simplified control, and better spatial layout.

[0045] In this embodiment, the first lead screw 3 and the second lead screw 6 rotate in opposite directions. Correspondingly, adjacent drive wheel seats 8 are symmetrically distributed along the circumferential direction of the center of the four drive wheels 5.

[0046] When the reversing drive motor 1 drives the first lead screw 3 and the second lead screw 6 to rotate synchronously in opposite directions, the first lead screw nut 2 and the second lead screw nut 7 move towards or away from each other. This, through the connecting rod 9, drives all the drive wheel seats 8 to rotate synchronously around their axes, thereby enabling all the drive wheels 5 to switch between lateral and longitudinal movement. In this embodiment, when switching the travel direction of all the drive wheels 5, the center position of the four drive wheels 5 remains unchanged.

[0047] In this embodiment, the first lead screw 3 is a left-hand lead screw, and the second lead screw 6 is a right-hand lead screw. It should be understood that the first lead screw 3 can also be configured as a right-hand lead screw, and the second lead screw 6 as a left-hand lead screw.

[0048] To limit the rotational stroke of the drive wheel seat 8 to ensure that all drive wheels 5 switch between lateral and longitudinal movement, limiters are respectively provided on the first lead screw 3 and the second lead screw 6. The limiters are either electronic limiters or mechanical limiters.

[0049] In this embodiment, the commutation drive motor 1 can be powered by a 24V DC mobile power supply.

[0050] In this embodiment, at least one of the four drive wheel seats 8, the first lead screw 3, the second lead screw 6, the first lead screw nut 2, the second lead screw nut 7, and the four connecting rods 9 is made of a lightweight, high-strength structural material. In other words, apart from standard parts, under the condition that the material meets the requirements of strength, rigidity, and stability, alloy materials such as aluminum alloys are preferentially selected for various processed parts. Aluminum alloys have advantages such as low density, high mechanical properties, and ease of processing, which can reduce the overall weight of the transverse and longitudinal movement rapid switching mechanism in this embodiment, thereby improving mechanical performance and reversing efficiency.

[0051] The following describes the specific structure of the drive wheel housing 8. Taking the i-th drive wheel housing 8 as an example, it includes the first end B. i Third end D i and set at the first end B i and the third end D i The second end C between i The i-th drive wheel seat is connected to the second end C. i Hinged to chassis 4, via the first end B i Hinged to one end of the corresponding connecting rod 9, the corresponding drive wheel 5 is mounted on the third end D. i .by Figure 1 For example, the drive wheel seat on the right side of the front row is the first drive wheel seat, the drive wheel seat on the right side of the rear row is the second drive wheel seat, the drive wheel seat on the left side of the rear row is the third drive wheel seat, and the drive wheel seat on the left side of the front row is the fourth drive wheel seat. Figure 1The diagram shows the first end B1, the second end C1 and the third end D1 of the first drive wheel seat, the first end B2, the second end C2 and the third end D2 of the second drive wheel seat, the first end B3, the second end C3 and the third end D3 of the third drive wheel seat, and the first end B4, the second end C4 and the third end D4 of the fourth drive wheel seat. Figure 1 Hinge shaft A1 and hinge shaft A2 are also shown, wherein the other ends of the two connecting rods 9 are hinged to the first lead screw nut 2 via hinge shaft A1, and the other ends of the other two connecting rods 9 are hinged to the second lead screw nut 7 via hinge shaft A2.

[0052] The following describes how the horizontal and vertical movement rapid switching mechanism of this embodiment is used in the process of switching all drive wheels 5.

[0053] In the initial case, such as Figure 1 As shown, the four-wheel drive vehicle is in the longitudinal direction of movement.

[0054] When the reversing drive motor 1 is activated, the first lead screw 3 rotates around its axis in the first direction, and the second lead screw 6 rotates in the opposite direction. This causes the first lead screw nut 2 and the second lead screw nut 7 to move in opposite directions. Consequently, the connecting rod 9, which is hinged to the first lead screw nut 2 and the second lead screw nut 7 respectively, pulls the drive wheel seat 8 and the drive wheel 5 to rotate. When the rotation angle reaches 90 degrees, as... Figure 2 As shown, the four-wheel drive vehicle switches to the lateral movement direction. Figure 2 The middle arrow indicates the direction of lateral movement.

[0055] By controlling the rotation direction of the first lead screw 3 and the second lead screw 6 in the opposite direction to the above process using the reversing drive motor 1, the four-wheel drive vehicle switches from lateral movement to longitudinal movement.

[0056] Example 2

[0057] Unlike Embodiment 1, in this embodiment, the first lead screw 3 and the second lead screw 6 have the same rotation direction. Correspondingly, the two drive wheel seats 8 connected to the first lead screw 3 via the connecting rod 9 are symmetrically distributed about the first lead screw 3, and the two drive wheel seats 8 connected to the second lead screw 6 via the connecting rod 9 are symmetrically distributed about the second lead screw 6.

[0058] When the commutator drive motor 1 drives the first lead screw 3 and the second lead screw 6 to rotate synchronously in the same direction, the first lead screw nut 2 and the second lead screw nut 7 reciprocate linearly in the same direction. This, through the connecting rod 9, drives all drive wheel seats 8 to rotate synchronously around their axes, thereby enabling all drive wheels 5 to switch between lateral and longitudinal movement. In this embodiment, when switching the travel direction of all drive wheels 5, the position of the center of the four drive wheels 5 changes. A structural diagram of embodiment 2 is not shown.

[0059] This utility model provides a concept and method for a rapid switching mechanism for lateral and longitudinal movement applicable to four-wheel drive vehicles. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles, characterized in that, include: Four drive wheel seats (8) are provided in correspondence with the four drive wheels (5) of the four-wheel drive vehicle and are respectively hinged to the chassis (4) of the four-wheel drive vehicle. The first lead screw (3) and the second lead screw (6) are mounted on the chassis (4) and configured to rotate synchronously. Rotate the first lead screw nut (2) and the second lead screw nut (7) that are respectively connected to the first lead screw (3) and the second lead screw (6); And four connecting rods (9), which are hinged one-to-one with the four drive wheel seats (8), wherein the other end of two of the connecting rods (9) is hinged to the first lead screw nut (2) respectively, and the other end of the other two connecting rods (9) is hinged to the second lead screw nut (7) respectively; When the first lead screw (3) and the second lead screw (6) move synchronously, the first lead screw nut (2) and the second lead screw nut (7) move along the first lead screw (3) and the second lead screw (6) respectively. Through the connecting rod (9), all the drive wheel seats (8) rotate synchronously around their axes, thereby realizing the switching of all the drive wheels (5) between lateral movement and longitudinal movement.

2. The rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 1, characterized in that, The first lead screw (3) and the second lead screw (6) rotate in opposite directions; correspondingly, the two adjacent drive wheel seats (8) are symmetrically distributed along the circumference of the center of the four drive wheels (5).

3. The rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 2, characterized in that, When the first lead screw (3) and the second lead screw (6) rotate synchronously in opposite directions, the first lead screw nut (2) and the second lead screw nut (7) move toward or away from each other.

4. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 3, characterized in that, The first lead screw (3) is a left-hand lead screw, and the second lead screw (6) is a right-hand lead screw, or the first lead screw (3) is a right-hand lead screw, and the second lead screw (6) is a left-hand lead screw.

5. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 1, characterized in that, The first lead screw (3) and the second lead screw (6) have the same direction of rotation; correspondingly, the two drive wheel seats (8) connected to the first lead screw (3) via the connecting rod (9) are symmetrically distributed about the first lead screw (3), and the two drive wheel seats (8) connected to the second lead screw (6) via the connecting rod (9) are symmetrically distributed about the second lead screw (6).

6. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 5, characterized in that, When the first lead screw (3) and the second lead screw (6) rotate in the same direction and move synchronously, the first lead screw nut (2) and the second lead screw nut (7) reciprocate in the same direction.

7. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to any one of claims 1 to 6, characterized in that, The first lead screw (3) and the second lead screw (6) are respectively provided with limiters for limiting the rotational stroke of the drive wheel seat (8) to ensure that all the drive wheels (5) switch between lateral and longitudinal movement. The limiters are electronic limiters or mechanical limiters.

8. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 7, characterized in that, It also includes a commutation drive motor (1), with the first lead screw (3) and the second lead screw (6) respectively connected to the two ends of the commutation drive motor (1) to achieve synchronous drive by the commutation drive motor (1).

9. A rapid switching mechanism for lateral and longitudinal movement suitable for four-wheel drive vehicles according to claim 8, characterized in that, The commutation drive motor (1) is located at the center of the four drive wheels (5) and fixed to the chassis (4) of the four-wheel drive vehicle.

10. A rapid switching mechanism for lateral and longitudinal movement suitable for a four-wheel drive vehicle according to any one of claims 1 to 6, characterized in that, At least one of the four drive wheel seats (8), the first lead screw (3), the second lead screw (6), the first lead screw nut (2), the second lead screw nut (7), and the four connecting rods (9) is made of a lightweight and high-strength structural material.

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