Vehicle preload system and vehicle

Abstract

The present disclosure relates to a vehicle pre-tensioning system and a vehicle, the system comprising: a drive motor and a pre-tensioning device, the pre-tensioning device comprising a transmission mechanism and a hydraulic circuit, the drive motor being connected to the hydraulic circuit via the transmission mechanism, the hydraulic circuit comprising a bidirectional hydraulic pump, a buffer module and an oil cylinder, the bidirectional hydraulic pump being used to pump the oil in the oil cylinder into the hydraulic circuit when the drive torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module, and the transmission mechanism being used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain. The present disclosure generates a hydraulic load to absorb the impact generated when the drive motor drives the transmission chain when the drive torque passes through zero by the pre-tensioning device, thereby avoiding vibration and impact sound of the vehicle during driving, and at the same time, there is no need to increase pre-torque to the drive motor, thereby avoiding the occurrence of potential control problems.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric vehicles, and in particular to a vehicle pre-tensioning system and a vehicle. Background Art

[0002] In today's world of sustainable development, environmentally friendly electric vehicles are gaining widespread adoption. When driving an electric vehicle, the drive motor generates driving torque, which is decelerated by a single-stage or multi-stage reducer before being transmitted to the wheels via the final reducer to propel the vehicle forward. In electric vehicle transmission chains, a certain clearance exists between the shaft and gears to prevent gear locking due to thermal expansion and contraction. This can cause the vehicle to vibrate and make a jarring sound when the drive torque passes zero, compromising driving comfort.

[0003] In the related art, software control is mainly used to limit the rate of change of the driving torque when the driving torque passes through 0, and to add a pre-torque to the drive motor before the vehicle starts to eliminate the gap between the shaft teeth and the bowl teeth, thereby avoiding the vehicle from shaking and impacting during the driving process. However, due to the consistency problem of the vehicle in the production process, the static friction between the shaft teeth and bowl teeth of different vehicles varies greatly, which makes it difficult to set the pre-torque value. In addition, the pre-torque will complicate the control strategies such as vehicle shifting and braking, and the control complexity is high, and it is easy to cause potential control problems. Summary of the Invention

[0004] In order to solve the problems existing in the related art, the present disclosure provides a vehicle pre-tensioning system and a vehicle.

[0005] To achieve the above objectives, according to a first aspect of an embodiment of the present disclosure, a vehicle pretensioning system is provided, the pretensioning system comprising: a drive motor and a pretensioning device, the pretensioning device comprising a transmission mechanism and a hydraulic circuit connected to the transmission mechanism, the drive motor being connected to the hydraulic circuit via the transmission mechanism, the drive motor transmitting the drive torque of the drive motor to the wheels of the vehicle via a transmission chain; the hydraulic circuit comprising a bidirectional hydraulic pump, a buffer module connected to the bidirectional hydraulic pump, and an oil cylinder connected to the buffer module;

[0006] The bidirectional hydraulic pump is configured to pump the oil in the oil cylinder into the hydraulic circuit when the driving torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module;

[0007] The transmission mechanism is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain.

[0008] Optionally, the buffer module includes a first buffer assembly and a second buffer assembly, the first buffer assembly is connected to the bidirectional hydraulic pump and the oil cylinder respectively, and the second buffer assembly is connected to the bidirectional hydraulic pump and the oil cylinder respectively;

[0009] The first buffer assembly is configured to generate the hydraulic load when the driving torque passes through zero and the driving motor is reversed;

[0010] The second buffer assembly is configured to generate the hydraulic load when the driving torque passes through zero and the driving motor rotates forward.

[0011] Optionally, the first buffer assembly includes a first hydraulic cylinder, a first one-way valve, a second one-way valve and a first flow restrictor;

[0012] A first piston is provided in the cavity of the first hydraulic cylinder. The cavity of the first hydraulic cylinder is connected to the cylinder through a first oil outlet branch and a first oil inlet branch, respectively. A first one-way valve is provided in the first oil outlet branch, and a second one-way valve is provided in the first oil inlet branch. The first one-way valve is used to allow the oil in the cavity of the first hydraulic cylinder to flow into the cylinder, and the second one-way valve is used to allow the oil in the cylinder to flow into the cavity of the first hydraulic cylinder. The first piston is provided in the cavity of the first hydraulic cylinder between a first position and a second position. The first position is the point where the first oil outlet branch is connected to the cavity of the first hydraulic cylinder, and the second position is the point where the first oil inlet branch is connected to the cavity of the first hydraulic cylinder.

[0013] The first end of the first flow limiter is connected to the oil cylinder through a pipeline, the second end of the first flow limiter is connected to the first end of the first hydraulic cylinder through a pipeline, and the second end of the first hydraulic cylinder is connected to the first end of the bidirectional hydraulic pump through a pipeline.

[0014] Optionally, the bidirectional hydraulic pump is configured to pump the oil in the oil cylinder into the cavity of the first hydraulic cylinder when the driving torque passes through zero and the driving motor reverses, so as to move the first piston in a first direction until the first piston moves to a first target position, the first direction being a direction from the second position to the first position, and the first target position being located in the first direction of the first position and adjacent to the first position;

[0015] The first flow restrictor is configured to generate the hydraulic load when the first piston moves to the first target position.

[0016] Optionally, the second buffer assembly includes a second hydraulic cylinder, a third one-way valve, a fourth one-way valve and a second flow restrictor;

[0017] A second piston is provided in the cavity of the second hydraulic cylinder. The cavity of the second hydraulic cylinder is connected to the cylinder through a second oil inlet branch and a second oil outlet branch, respectively. The third one-way valve is provided in the second oil inlet branch, and the fourth one-way valve is provided in the second oil outlet branch. The third one-way valve is used to allow the oil in the cylinder to flow into the cavity of the second hydraulic cylinder, and the fourth one-way valve is used to allow the oil in the cavity of the second hydraulic cylinder to flow into the cylinder. The second piston is provided in the cavity of the second hydraulic cylinder between a third position and a fourth position. The third position is the connection point between the second oil inlet branch and the cavity of the second hydraulic cylinder, and the fourth position is the connection point between the second oil outlet branch and the cavity of the second hydraulic cylinder.

[0018] The first end of the second hydraulic cylinder is connected to the second end of the bidirectional hydraulic pump through a pipeline, the first end of the second flow limiter is connected to the second end of the second hydraulic cylinder through a pipeline, and the second end of the second flow limiter is connected to the oil cylinder through a pipeline.

[0019] Optionally, the bidirectional hydraulic pump is configured to pump the oil in the oil cylinder into the cavity of the second hydraulic cylinder when the driving torque passes through zero and the driving motor rotates forward, so as to move the second piston in a second direction until the second piston moves to a second target position, wherein the second direction is a direction from the third position to the fourth position, and the second target position is located in the second direction of the third position and is adjacent to the first position;

[0020] The second flow restrictor is configured to generate the hydraulic load when the second piston moves to the second target position.

[0021] Optionally, the transmission mechanism includes a first gear, and a second gear is provided on the output shaft of the drive motor; the second gear is fixed on the input shaft of the bidirectional hydraulic pump, and the first gear is meshed with the second gear.

[0022] According to a second aspect of an embodiment of the present disclosure, a vehicle is provided, on which the vehicle pretensioning system according to the first aspect is provided.

[0023] Through the above technical solution, the pre-tensioning system of the vehicle in the present disclosure includes: a drive motor and a pre-tensioning device, the pre-tensioning device includes a transmission mechanism and a hydraulic circuit, the drive motor is connected to the hydraulic circuit through the transmission mechanism, the drive motor transmits the driving torque of the drive motor to the wheels of the vehicle through the transmission chain, the hydraulic circuit includes a bidirectional hydraulic pump, a buffer module and an oil cylinder, wherein the bidirectional hydraulic pump is used to pump the oil in the oil cylinder into the hydraulic circuit when the drive torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module, and the transmission mechanism is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain. The present disclosure generates a hydraulic load to absorb the impact generated when the drive motor drives the transmission chain when the drive torque passes through zero through the pre-tensioning device, which can avoid the vehicle from shaking and impacting during the driving process. At the same time, there is no need to add additional control strategies to increase the pre-torque of the drive motor, which can avoid the occurrence of potential control problems.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0026] Figure 1 is a block diagram of a vehicle pretensioning system according to an exemplary embodiment;

[0027] Figure 2 is a block diagram of another vehicle pretensioning system according to an exemplary embodiment;

[0028] Figure 3 is a schematic diagram of a vehicle pretensioning system according to an exemplary embodiment;

[0029] Figure 4 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0031] Before introducing the vehicle preload system and vehicle provided by the present disclosure, we first introduce the application scenarios involved in various embodiments of the present disclosure. This application scenario may include a vehicle driven by a drive motor. The vehicle may be an electric vehicle, or other types of motor vehicles or non-motor vehicles, such as an electric bicycle, an electric tricycle, and an electric train.

[0032] Figure 1 FIG. 1 is a block diagram of a vehicle pre-tensioning system according to an exemplary embodiment. Figure 1 As shown, the pretensioning system 1 includes a drive motor 2 and a pretensioning device 3. The pretensioning device 3 includes a transmission mechanism 31 and a hydraulic circuit 32 connected to the transmission mechanism 31. The drive motor 2 is connected to the hydraulic circuit 32 via the transmission mechanism 31. The drive motor 2 transmits its driving torque to the vehicle's wheels via a transmission chain. The hydraulic circuit 32 includes a bidirectional hydraulic pump 321, a buffer module 322 connected to the bidirectional hydraulic pump 321, and a cylinder 323 connected to the buffer module 322.

[0033] The bidirectional hydraulic pump 321 is used to pump the oil in the oil cylinder 323 into the hydraulic circuit 32 when the driving torque passes through zero, so that the oil circulating in the hydraulic circuit 32 generates a hydraulic load when passing through the buffer module 322 .

[0034] For example, since electric vehicles do not have a clutch and a torque converter, and the forward and reverse movement of electric vehicles are achieved by the forward or reverse rotation of the drive motor 2, this will cause the driving torque of the drive motor 2 to exceed 0 in a short period of time during the vehicle starting or the forward and reverse switching of the drive motor 2. At this time, the shaft teeth and the basin teeth will switch forward and reverse in a short period of time. Under the action of the gear clearance, when the shaft teeth and the basin teeth switch forward and reverse in a short period of time, tooth knocking will occur, causing the vehicle to shake and produce impact sounds, thereby affecting the driving comfort of the vehicle. In order to avoid this situation, a pre-tightening device composed of a transmission mechanism 31 and a hydraulic circuit 32 can be provided to absorb the impact generated when the drive motor 2 drives the transmission chain. Among them, the hydraulic circuit 32 can include a bidirectional hydraulic pump 321, a buffer module 322 and an oil cylinder 323.

[0035] Specifically, the drive motor 2 can first be connected to the hydraulic circuit 32 through the transmission mechanism 31. At this time, in addition to the driving transmission chain, the drive motor 2 is also connected in parallel to a set of hydraulic circuits 32. Among them, the transmission mechanism 31 may include a first gear, and a second gear may be provided on the output shaft of the drive motor 2. The connection method between the drive motor 2 and the hydraulic circuit 32 can be, for example: the second gear is fixed to the input shaft of the bidirectional hydraulic pump 321, and the first gear is meshed with the second gear to achieve the connection between the drive motor 2 and the hydraulic circuit 32. If the driving torque of the drive motor 2 exceeds 0, the bidirectional hydraulic pump 321 can pump the oil in the cylinder 323 into the hydraulic circuit 32. At the same time, when the oil circulating in the hydraulic circuit 32 passes through the buffer module 322, the buffer module 322 can limit the flow of the oil to generate a force that hinders the normal flow of the oil, thereby generating a hydraulic load.

[0036] The transmission mechanism 31 is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor 2 drives the transmission chain.

[0037] For example, when the buffer module 322 generates a hydraulic load, the drive motor 2 is connected to the hydraulic circuit 32 via the transmission mechanism 31. Under the action of the transmission mechanism 31, the drive motor 2 not only drives the transmission chain, but also drives the hydraulic load. In other words, a portion of the drive torque originally output to the wheels via the transmission chain by the drive motor 2 needs to be diverted to provide it to the hydraulic load, effectively applying the hydraulic load to the transmission chain. Similarly, when the drive motor 2 generates an impact on the transmission chain, the hydraulic load can absorb some of the impact, thereby preventing vehicle vibration and impact noise during driving.

[0038] It should be noted that the preload device 3 may also use a damping member with a variable shape to absorb the impact generated when the drive motor 2 drives the transmission chain. The damping member may be, for example, a spring or an elastic member, which is not specifically limited in this disclosure.

[0039] In summary, the pre-tensioning system of the vehicle disclosed in the present invention includes: a drive motor and a pre-tensioning device, the pre-tensioning device includes a transmission mechanism and a hydraulic circuit, the drive motor is connected to the hydraulic circuit through the transmission mechanism, the drive motor transmits the driving torque of the drive motor to the wheels of the vehicle through the transmission chain, the hydraulic circuit includes a bidirectional hydraulic pump, a buffer module and an oil cylinder, wherein the bidirectional hydraulic pump is used to pump the oil in the oil cylinder into the hydraulic circuit when the driving torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module, and the transmission mechanism is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain. The present invention generates a hydraulic load to absorb the impact generated when the drive motor drives the transmission chain when the driving torque passes through zero through the pre-tensioning device, which can avoid the vehicle from shaking and impacting during the driving process. At the same time, there is no need to add additional control strategies to increase the pre-torque of the drive motor, which can avoid the occurrence of potential control problems.

[0040] Figure 2 FIG. 1 is a block diagram of another vehicle pre-tensioning system according to an exemplary embodiment. Figure 2 As shown, the buffer module 322 includes a first buffer component 3221 and a second buffer component 3222. The first buffer component 3221 is connected to the bidirectional hydraulic pump 321 and the oil cylinder 323 respectively, and the second buffer component 3222 is connected to the bidirectional hydraulic pump 321 and the oil cylinder 323 respectively.

[0041] The first buffer assembly 3221 is used to generate a hydraulic load when the driving torque passes through zero and the driving motor 2 reverses.

[0042] The second buffer assembly 3222 is used to generate a hydraulic load when the driving torque passes through zero and the driving motor 2 rotates forward.

[0043] For example, the buffer module 322 may include a first buffer assembly 3221 and a second buffer assembly 3222. If the drive torque of the drive motor 2 exceeds 0 and the drive motor reverses, the bidirectional hydraulic pump 321 may pump the oil in the cylinder 323 to the first buffer assembly 3221. The first buffer assembly 3221 may generate a hydraulic load by restricting the flow of oil to create a force that impedes the normal flow of oil. The drive torque of the drive motor 2 exceeds 0 and the drive motor 2 reverses, which includes two situations: 1) the drive motor 2 changes from being stopped to reverse, and 2) the drive motor 2 changes from forward to reverse.

[0044] Additionally, if the drive torque of drive motor 2 exceeds zero and drive motor 2 is rotating forward, bidirectional hydraulic pump 321 can pump the oil in cylinder 323 to second buffer assembly 3222. Second buffer assembly 3222 can restrict the oil flow to create a force that impedes the normal flow of oil, thereby generating a hydraulic load. Drive motor 2's drive torque exceeding zero and forward rotation can occur in two situations: 1) when drive motor 2 is stopped and then switches to forward rotation, and 2) when drive motor 2 switches from reverse rotation to forward rotation.

[0045] Figure 3 FIG. 1 is a schematic diagram of a vehicle pre-tensioning system according to an exemplary embodiment. Figure 3 As shown, the first buffer assembly 3221 includes a first hydraulic cylinder a1, a first one-way valve b1, a second one-way valve b2 and a first flow restrictor c1.

[0046] A first piston d1 is disposed within the cavity of the first hydraulic cylinder a1. The cavity of the first hydraulic cylinder a1 is connected to the oil cylinder 323 via the first oil outlet branch e1 and the first oil inlet branch f1, respectively. A first one-way valve b1 is disposed within the first oil outlet branch e1, and a second one-way valve b2 is disposed within the first oil inlet branch f1. The first one-way valve b1 allows the oil in the cavity of the first hydraulic cylinder a1 to flow into the oil cylinder 323, while the second one-way valve b2 allows the oil in the oil cylinder 323 to flow into the cavity of the first hydraulic cylinder a1. The first piston d1 is disposed within the cavity of the first hydraulic cylinder a1 between a first position and a second position. The first position connects the first oil outlet branch e1 to the cavity of the first hydraulic cylinder a1, while the second position connects the first oil inlet branch f1 to the cavity of the first hydraulic cylinder a1.

[0047] The first end of the first flow limiter c1 is connected to the oil cylinder 323 through a pipeline, the second end of the first flow limiter c1 is connected to the first end of the first hydraulic cylinder a1 through a pipeline, and the second end of the first hydraulic cylinder a1 is connected to the first end of the bidirectional hydraulic pump 321 through a pipeline.

[0048] In one scenario, the first buffer assembly 3221 may include a first hydraulic cylinder a1, a first one-way valve b1, a second one-way valve b2, and a first flow restrictor c1. When the driving torque passes through zero and the drive motor 2 is reversed, the bidirectional hydraulic pump 321 can pump the oil in the cylinder 323 into the cavity of the first hydraulic cylinder a1, causing the first piston d1 to move in a first direction until the first piston d1 reaches the first target position. The first flow restrictor c1 is used to limit the flow of oil through the first flow restrictor c1. For example, the first flow restrictor c1 may be a throttle valve. During the movement of the first piston d1 to the first target position, the first flow restrictor c1 can limit the flow of oil through the first flow restrictor c1 and generate a force that impedes the normal flow of oil, causing the first piston d1 to slowly move toward the first target position, thereby generating a hydraulic load in the hydraulic circuit 32. The first direction is the direction from the second position toward the first position, and the first target position is located in the first direction of the first position and adjacent to the first position.

[0049] Optionally, the second buffer assembly 3222 includes a second hydraulic cylinder a2, a third one-way valve b3, a fourth one-way valve b4 and a second flow restrictor c2.

[0050] A second piston d2 is disposed within the cavity of the second hydraulic cylinder a2. The cavity of the second hydraulic cylinder a2 is connected to the oil cylinder 323 via the second oil inlet branch f2 and the second oil outlet branch e2, respectively. A third one-way valve b3 is disposed within the second oil inlet branch f2, and a fourth one-way valve b4 is disposed within the second oil outlet branch e2. The third one-way valve b3 is configured to allow the oil in the oil cylinder 323 to flow into the cavity of the second hydraulic cylinder a2, while the fourth one-way valve b4 is configured to allow the oil in the cavity of the second hydraulic cylinder a2 to flow into the oil cylinder 323. The second piston d2 is disposed within the cavity of the second hydraulic cylinder a2 between a third position and a fourth position. The third position is where the second oil inlet branch f2 connects to the cavity of the second hydraulic cylinder a2, while the fourth position is where the second oil outlet branch e2 connects to the cavity of the second hydraulic cylinder a2.

[0051] The first end of the second hydraulic cylinder a2 is connected to the second end of the bidirectional hydraulic pump 321 through a pipeline, the first end of the second flow limiter c2 is connected to the second end of the second hydraulic cylinder a2 through a pipeline, and the second end of the second flow limiter c2 is connected to the oil cylinder 323 through a pipeline.

[0052] In another scenario, the second buffer assembly 3222 may include a second hydraulic cylinder a2, a third one-way valve b3, a fourth one-way valve b4, and a second flow restrictor c2. When the drive torque passes through zero and the drive motor 2 rotates forward, the bidirectional hydraulic pump 321 can pump the oil in the cylinder 323 into the cavity of the second hydraulic cylinder a2, causing the second piston d2 to move in the second direction until the second piston d2 reaches the second target position. The second flow restrictor c2 is used to limit the flow of oil through the second flow restrictor c2. For example, the second flow restrictor c2 may be a throttle valve. The second flow restrictor c2 can limit the flow of oil through the second flow restrictor c2 during the movement of the second piston d2 to the second target position, generating a force that hinders the normal flow of oil, causing the second piston d2 to slowly move toward the second target position, thereby generating a hydraulic load in the hydraulic circuit 32. The second direction is the direction from the third position to the fourth position, and the second target position is located in the second direction of the third position and adjacent to the fourth position.

[0053] In summary, the pre-tensioning system of the vehicle disclosed in the present invention includes: a drive motor and a pre-tensioning device, the pre-tensioning device includes a transmission mechanism and a hydraulic circuit, the drive motor is connected to the hydraulic circuit through the transmission mechanism, the drive motor transmits the driving torque of the drive motor to the wheels of the vehicle through the transmission chain, the hydraulic circuit includes a bidirectional hydraulic pump, a buffer module and an oil cylinder, wherein the bidirectional hydraulic pump is used to pump the oil in the oil cylinder into the hydraulic circuit when the driving torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module, and the transmission mechanism is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain. The present invention generates a hydraulic load to absorb the impact generated when the drive motor drives the transmission chain when the driving torque passes through zero through the pre-tensioning device, which can avoid the vehicle from shaking and impacting during the driving process. At the same time, there is no need to add additional control strategies to increase the pre-torque of the drive motor, which can avoid the occurrence of potential control problems.

[0054] The present disclosure also relates to a vehicle, such as Figure 4 As shown, the vehicle 4 is provided with the pretensioning system 1 of any of the above-mentioned vehicles.

[0055] Regarding the vehicle 4 in the above embodiment, the specific manner in which the pretensioning system 1 of the vehicle performs operations has been described in detail in the embodiment of the pretensioning system 1 of the vehicle, and will not be elaborated here.

[0056] In summary, the pre-tensioning system of the vehicle disclosed in the present invention includes: a drive motor and a pre-tensioning device, the pre-tensioning device includes a transmission mechanism and a hydraulic circuit, the drive motor is connected to the hydraulic circuit through the transmission mechanism, the drive motor transmits the driving torque of the drive motor to the wheels of the vehicle through the transmission chain, the hydraulic circuit includes a bidirectional hydraulic pump, a buffer module and an oil cylinder, wherein the bidirectional hydraulic pump is used to pump the oil in the oil cylinder into the hydraulic circuit when the driving torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module, and the transmission mechanism is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain. The present invention generates a hydraulic load to absorb the impact generated when the drive motor drives the transmission chain when the driving torque passes through zero through the pre-tensioning device, which can avoid the vehicle from shaking and impacting during the driving process. At the same time, there is no need to add additional control strategies to increase the pre-torque of the drive motor, which can avoid the occurrence of potential control problems.

[0057] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0059] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vehicle preload system, characterized in that: The pretensioning system includes: a drive motor and a pretensioning device, the pretensioning device including a transmission mechanism and a hydraulic circuit connected to the transmission mechanism, the drive motor is connected to the hydraulic circuit via the transmission mechanism, and the drive motor transmits the drive torque of the drive motor to the wheels of the vehicle via a transmission chain; the hydraulic circuit includes a bidirectional hydraulic pump, a buffer module connected to the bidirectional hydraulic pump, and an oil cylinder connected to the buffer module; The bidirectional hydraulic pump is configured to pump the oil in the oil cylinder into the hydraulic circuit when the driving torque passes through zero, so that the oil circulating in the hydraulic circuit generates a hydraulic load when passing through the buffer module; The transmission mechanism is used to apply the generated hydraulic load to the transmission chain to absorb the impact generated when the drive motor drives the transmission chain.

2. The system according to claim 1, wherein: The buffer module includes a first buffer assembly and a second buffer assembly, the first buffer assembly is connected to the bidirectional hydraulic pump and the oil cylinder respectively, and the second buffer assembly is connected to the bidirectional hydraulic pump and the oil cylinder respectively; The first buffer assembly is configured to generate the hydraulic load when the driving torque passes through zero and the driving motor is reversed; The second buffer assembly is configured to generate the hydraulic load when the driving torque passes through zero and the driving motor rotates forward.

3. The system according to claim 2, characterized in that The first buffer assembly includes a first hydraulic cylinder, a first one-way valve, a second one-way valve and a first flow restrictor; A first piston is provided in the cavity of the first hydraulic cylinder. The cavity of the first hydraulic cylinder is connected to the cylinder through a first oil outlet branch and a first oil inlet branch, respectively. A first one-way valve is provided in the first oil outlet branch, and a second one-way valve is provided in the first oil inlet branch. The first one-way valve is used to allow the oil in the cavity of the first hydraulic cylinder to flow into the cylinder, and the second one-way valve is used to allow the oil in the cylinder to flow into the cavity of the first hydraulic cylinder. The first piston is provided in the cavity of the first hydraulic cylinder between a first position and a second position. The first position is the point where the first oil outlet branch is connected to the cavity of the first hydraulic cylinder, and the second position is the point where the first oil inlet branch is connected to the cavity of the first hydraulic cylinder. The first end of the first flow limiter is connected to the oil cylinder through a pipeline, the second end of the first flow limiter is connected to the first end of the first hydraulic cylinder through a pipeline, and the second end of the first hydraulic cylinder is connected to the first end of the bidirectional hydraulic pump through a pipeline.

4. The system according to claim 3, characterized in that The bidirectional hydraulic pump is configured to pump the oil in the oil cylinder into the cavity of the first hydraulic cylinder when the driving torque passes through zero and the driving motor rotates in reverse, so as to move the first piston in a first direction until the first piston moves to a first target position, wherein the first direction is a direction from the second position to the first position, and the first target position is located in the first direction of the first position and is adjacent to the first position; The first flow restrictor is configured to generate the hydraulic load when the first piston moves to the first target position.

5. The system according to claim 3, wherein: The second buffer assembly includes a second hydraulic cylinder, a third one-way valve, a fourth one-way valve and a second flow restrictor; A second piston is provided in the cavity of the second hydraulic cylinder. The cavity of the second hydraulic cylinder is connected to the cylinder through a second oil inlet branch and a second oil outlet branch, respectively. The third one-way valve is provided in the second oil inlet branch, and the fourth one-way valve is provided in the second oil outlet branch. The third one-way valve is used to allow the oil in the cylinder to flow into the cavity of the second hydraulic cylinder, and the fourth one-way valve is used to allow the oil in the cavity of the second hydraulic cylinder to flow into the cylinder. The second piston is provided in the cavity of the second hydraulic cylinder between a third position and a fourth position. The third position is the connection point between the second oil inlet branch and the cavity of the second hydraulic cylinder, and the fourth position is the connection point between the second oil outlet branch and the cavity of the second hydraulic cylinder. The first end of the second hydraulic cylinder is connected to the second end of the bidirectional hydraulic pump through a pipeline, the first end of the second flow limiter is connected to the second end of the second hydraulic cylinder through a pipeline, and the second end of the second flow limiter is connected to the oil cylinder through a pipeline.

6. The system according to claim 5, characterized in that The bidirectional hydraulic pump is configured to pump the oil in the oil cylinder into the cavity of the second hydraulic cylinder when the driving torque passes through zero and the driving motor rotates forward, so as to move the second piston in a second direction until the second piston moves to a second target position, wherein the second direction is a direction from the third position to the fourth position, and the second target position is located in the second direction of the third position and is adjacent to the first position; The second flow restrictor is configured to generate the hydraulic load when the second piston moves to the second target position.

7. The system according to any one of claims 1 to 6, characterized in that The transmission mechanism includes a first gear, and a second gear is provided on the output shaft of the drive motor; the second gear is fixed on the input shaft of the bidirectional hydraulic pump, and the first gear is meshed with the second gear.

8. A vehicle, characterized in that: The vehicle is provided with the vehicle pretensioning system according to any one of claims 1 to 7.

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