Driving motor suspension system

Abstract

The invention relates to a drive motor suspension system which comprises a left longitudinal beam assembly, a right longitudinal beam assembly and an auxiliary frame assembly fixedly connected between the left longitudinal beam assembly and the right longitudinal beam assembly. The motor assembly is located on the front side of the auxiliary frame assembly and located between the left longitudinal beam assembly and the right longitudinal beam assembly. The suspension unit comprises a left bracket connected to the left longitudinal beam assembly and a right bracket connected to the right longitudinal beam assembly; the left elastic support assembly is connected to the left bracket, and the right elastic support assembly is connected to the right bracket; the left support is connected between the left elastic support assembly and the motor assembly, and the right support is connected between the right elastic support assembly and the motor assembly; the rear suspension support is connected to the auxiliary frame assembly, and the rear suspension assembly is connected between the rear suspension support and the motor assembly. According to the suspension unit, the decoupling rate of the suspension unit is increased, the bearing reaction of each suspension point is reduced, and the displacement of each suspension cushion is reduced, so that the reliability of a system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle suspension systems, and in particular to a drive motor suspension system. Background Art

[0002] The suspension system of an electric vehicle has the functions of isolating vibration, supporting and positioning the drive motor, protecting the drive motor, and overcoming the reaction force generated by the motor torque output; this requires that the components of the suspension system must have sufficient stiffness, strength, mode and reliability.

[0003] When an electric vehicle starts and accelerates, the motor torque changes greatly and reaches the maximum torque quickly, which will put a large impact load on the motor suspension system; when an electric drive vehicle encounters bad road conditions such as bumps and potholes, the motor suspension system will also be subjected to a large impact load; based on these characteristics, the suspension design of electric vehicles is quite different from that of fuel vehicles, requiring the suspension system to have not only sufficient rigidity and strength, but also effective limiting capabilities.

[0004] In the prior art, the design of the automobile suspension system is usually to determine the elastic center (hard point) of the suspension cushion based on the decoupling calculation, and then arrange the suspension system and perform structural design based on the hard point of the suspension cushion, specifically arranging and designing the components of the suspension cushion connecting the motor and the suspension cushion connecting the frame. There are two methods for decoupling calculation, namely the torque axis decoupling method and the energy decoupling method, but the torque axis decoupling method is not suitable for electric vehicles, and the energy decoupling method is also difficult to meet the suspension layout of electric vehicles.

[0005] Based on the above-mentioned technical characteristics of the electric vehicle suspension system, if the suspension system is improperly designed, faults such as damage to the suspension pad or breakage of the suspension bracket will often occur, affecting the durability and reliability of the suspension system, and thus affecting the durability and reliability of the entire vehicle, and making it difficult to assemble the powertrain. Summary of the invention

[0006] The embodiment of the present application provides a drive motor suspension system, which adopts the energy decoupling method and the mass center arrangement method in combination with the technical characteristics of the electric vehicle suspension system, and on this basis, reasonably suspends the three-dimensional stiffness of each suspension. And adopts reasonable assembly technology principles and assembly positioning technology. In order to solve the problem in the related art that the suspension system affects the durability and reliability of the whole vehicle, and the difficulty of powertrain assembly.

[0007] The embodiment of the present application provides a drive motor suspension system, comprising:

[0008] A vehicle frame, the vehicle frame comprising a left longitudinal beam assembly and a right longitudinal beam assembly which are spaced apart from each other, and a sub-frame assembly which is fixedly connected between the left longitudinal beam assembly and the right longitudinal beam assembly;

[0009] A motor assembly, the motor assembly being located at the front side of the subframe assembly and between the left longitudinal beam assembly and the right longitudinal beam assembly;

[0010] A suspension unit, the suspension unit comprising a left bracket connected to the left longitudinal beam assembly and a right bracket connected to the right longitudinal beam assembly;

[0011] A left elastic bracket assembly connected to the left bracket, and a right elastic bracket assembly connected to the right bracket;

[0012] A left bracket connected between the left elastic bracket assembly and the motor assembly, and a right bracket connected between the right elastic bracket assembly and the motor assembly;

[0013] A rear suspension bracket connected to the subframe assembly, and a rear suspension assembly connected between the rear suspension bracket and the motor assembly.

[0014] In some embodiments: the dynamic stiffness directions of the left elastic bracket assembly are respectively W1 direction, U1 direction and V1 direction, the W1 direction of the left elastic bracket assembly is parallel to the X direction of the whole vehicle, the U1 direction is parallel to the Y direction of the whole vehicle, and the V1 direction is parallel to the Z direction of the whole vehicle;

[0015] The dynamic stiffness directions of the right elastic bracket assembly are respectively W2 direction, U2 direction and V21 direction, the W2 direction of the right elastic bracket assembly is parallel to the X direction of the whole vehicle, the U2 direction is parallel to the Y direction of the whole vehicle, and the V2 direction is parallel to the Z direction of the whole vehicle;

[0016] The directions of dynamic stiffness of the rear suspension assembly are W3, U3 and V3 respectively. The W3 direction of the rear suspension assembly coincides with the line connecting the elastic center point of the rear suspension assembly and the output shaft of the motor assembly, the V3 direction is perpendicular to the line, and the U3 direction is parallel to the Y direction of the vehicle.

[0017] In some embodiments: the dynamic stiffness of the left elastic support assembly in the W1 direction, U1 direction, and V1 direction are 300 N.m, 150 N.m, and 580 N.m, respectively; the dynamic stiffness of the right elastic support assembly in the W2 direction, U2 direction, and V3 direction are 300 N.m, 250 N.m, and 420 N.m, respectively; the dynamic stiffness of the rear suspension assembly in the W3 direction, U3 direction, and V3 direction are 550 N.m, 210 N.m, and 550 N.m, respectively.

[0018] In some embodiments: the mass center of the motor assembly is point A, the elastic center point of the left elastic bracket assembly is point B, the elastic center point of the right elastic bracket assembly is point C, and the elastic center point of the rear suspension assembly is point D;

[0019] The distances between the projections of point A and point B, point C and point D on the XOY plane of the vehicle are AB, AC and AD respectively. Under the condition that the space layout of the engine compartment allows, the distances of AB, AC and AD all take the maximum value.

[0020] In some embodiments: the mass center of the motor assembly is point A, the elastic center point of the left elastic bracket assembly is point B, the elastic center point of the right elastic bracket assembly is point C, and the elastic center point of the rear suspension assembly is point D;

[0021] The distances between the projections of point A and point B, point C and point D on the XOZ plane of the vehicle are AB, AC and AD respectively. Under the condition that the space layout of the engine compartment allows, the distances of AB, AC and AD all take the maximum value.

[0022] In some embodiments: when the distance between the rear suspension assembly and the subframe assembly in the X-axis direction of the vehicle is limited, the rear suspension assembly is arranged on the motor assembly downward along the Z-axis direction of the vehicle below the motor assembly, and the ground clearance of the rear suspension assembly is greater than 200 mm.

[0023] In some embodiments: the left elastic bracket assembly is provided with a first mounting hole, a second mounting hole and a third mounting hole connected to the left bracket, and the connecting lines between the first mounting hole, the second mounting hole and the third mounting hole form a triangle;

[0024] The first mounting hole is located between the second mounting hole and the third mounting hole, the difference between the diameter of the first mounting hole and the diameter of the bolt on the left bracket is less than or equal to 1 mm, and the difference between the diameter of the second mounting hole and the third mounting hole and the diameter of the bolt on the left bracket is greater than or equal to 2 mm.

[0025] In some embodiments: the right suspension assembly is provided with a fourth mounting hole and a fifth mounting hole connected to the right bracket, and the fourth mounting hole and the fifth mounting hole are both oblong holes extending along the Y-axis direction of the vehicle;

[0026] The difference between the diameter of the fourth mounting hole and the fifth mounting hole and the diameter of the bolt on the right bracket is greater than or equal to 2 mm, and the distance between the center points of the two semicircular arcs of the fourth mounting hole and the fifth mounting hole is greater than 3 mm.

[0027] In some embodiments: the rear suspension bracket is provided with a sixth mounting hole connected to the rear suspension assembly, the rear suspension assembly is provided with an inner hole connected to the rear suspension bracket, the rear suspension bracket is connected with a bolt that penetrates the sixth mounting hole and the inner hole, the difference between the diameter of the sixth mounting hole and the diameter of the bolt is greater than or equal to 2 mm, and the difference between the diameter of the inner hole and the diameter of the bolt is greater than or equal to 0.3 mm.

[0028] In some embodiments: the left elastic support assembly, the right elastic support assembly and the rear suspension assembly are arranged in a triangle around the motor assembly, and the direction of the maximum dynamic stiffness of the left elastic support assembly, the right elastic support assembly and the rear suspension assembly is consistent with the X-axis direction of the vehicle.

[0029] The beneficial effects of the technical solution provided by this application include:

[0030] The embodiment of the present application provides a drive motor suspension system. Since the drive motor suspension system of the present application is provided with a frame, the frame includes a left longitudinal beam assembly and a right longitudinal beam assembly arranged at intervals from each other, and a sub-frame assembly fixedly connected between the left longitudinal beam assembly and the right longitudinal beam assembly; a motor assembly, the motor assembly is located on the front side of the sub-frame assembly and between the left longitudinal beam assembly and the right longitudinal beam assembly; a suspension unit, the suspension unit includes a left bracket connected to the left longitudinal beam assembly, a right bracket connected to the right longitudinal beam assembly; a left elastic bracket assembly connected to the left bracket, a right elastic bracket assembly connected to the right bracket; a left bracket connected between the left elastic bracket assembly and the motor assembly, a right bracket connected between the right elastic bracket assembly and the motor assembly; a rear suspension bracket connected to the sub-frame assembly, and a rear suspension assembly connected between the rear suspension bracket and the motor assembly.

[0031] Therefore, the left bracket, right bracket and rear suspension assembly of the driving motor suspension system of the present application jointly support the motor assembly, and the left bracket, right bracket and rear suspension bracket jointly connect the motor assembly to the left longitudinal beam assembly, the right longitudinal beam assembly and the subframe assembly; the left elastic bracket assembly, the right elastic bracket assembly and the rear suspension assembly play the role of connection, shock absorption and vibration isolation. The rear suspension assembly plays the role of supporting the motor assembly, and also plays the role of connection, shock absorption and vibration isolation. The rear suspension assembly connects the motor assembly and the rear suspension bracket, attenuates and isolates the vibration and force transmitted from the motor assembly to the rear suspension bracket. The suspension unit adopts a hanging arrangement structure, and then a bracket and a bracket are set for each suspension assembly. This design improves the decoupling rate of the suspension unit, reduces the support reaction force of each suspension point, and reduces the displacement of each suspension cushion, thereby improving the reliability of the system and achieving a lightweight design, and is easy to install on the whole vehicle, improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a schematic diagram of the structure of the drive motor suspension system of the embodiment of the present application;

[0034] Figure 2 It is a structural schematic diagram of the dynamic stiffness direction of the left elastic bracket assembly of the embodiment of the present application;

[0035] Figure 3 It is a structural schematic diagram of the dynamic stiffness direction of the right elastic bracket assembly of the embodiment of the present application;

[0036] Figure 4 It is a structural schematic diagram of the dynamic stiffness direction of the rear suspension assembly of the embodiment of the present application;

[0037] Figure 5 This is a top view of the structure of the suspension unit and the motor assembly of the embodiment of the present application;

[0038] Figure 6 This is a right side view of the structure of the suspension unit and the motor assembly according to the embodiment of the present application;

[0039] Figure 7 This is a right side view of the structure of the rear suspension assembly and the motor assembly of the embodiment of the present application;

[0040] Figure 8 This is a schematic diagram of the structure of the left elastic bracket assembly and the left bracket of the embodiment of the present application;

[0041] Fig. 9 This is a schematic structural diagram of the right elastic bracket assembly and the right bracket of an embodiment of the present application;

[0042] Fig.10 It is a schematic structural diagram of the rear suspension assembly and the rear suspension bracket according to an embodiment of the present application.

[0043] Reference numerals:

[0044] 1. Motor assembly; 2. Left bracket; 3. Left elastic bracket assembly; 4. Left bracket; 5. Right bracket; 6. Right elastic bracket assembly; 7. Right bracket; 8. Rear suspension assembly; 9. Rear suspension bracket; 10. Left longitudinal beam assembly; 11. Right longitudinal beam assembly; 12. Subframe assembly;

[0045] 3246, second mounting hole; 3247, first mounting hole; 3248, third mounting hole; 6111, fourth mounting hole; 6112, fifth mounting hole; 9111, sixth mounting hole. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0047] The embodiment of the present application provides a drive motor suspension system, which can solve the problem in the related art that the suspension system affects the durability and reliability of the entire vehicle and causes difficulty in assembling the powertrain.

[0048] See also Figure 1 As shown, an embodiment of the present application provides a drive motor suspension system, comprising:

[0049] The vehicle frame includes a left longitudinal beam assembly 10 and a right longitudinal beam assembly 11 which are spaced apart from each other, and a sub-frame assembly 12 which is fixedly connected between the left longitudinal beam assembly 10 and the right longitudinal beam assembly 11. The motor assembly 1 is located at the front side of the sub-frame assembly 12 and between the left longitudinal beam assembly 10 and the right longitudinal beam assembly 11. Figures 1 to 7 The X-axis direction is the length (front and back) direction of the vehicle, the Y-axis direction is the width (left and right) direction of the vehicle, and the Z-axis direction is the height (up and down) direction of the vehicle.

[0050] The suspension unit includes a left bracket 2 connected to the left longitudinal beam assembly 10, a right bracket 5 connected to the right longitudinal beam assembly 11, a left elastic bracket assembly 3 connected to the left bracket 2, and a right elastic bracket assembly 6 connected to the right bracket 5. A left bracket 4 connected between the left elastic bracket assembly 3 and the motor assembly 1, a right bracket 7 connected between the right elastic bracket assembly 6 and the motor assembly 1, a rear suspension bracket 9 connected to the subframe assembly 12, and a rear suspension assembly 8 connected between the rear suspension bracket 9 and the motor assembly 1.

[0051] The left bracket 2 of the embodiment of the present application is mounted on the left longitudinal beam assembly 10 by bolts; the left elastic bracket assembly 3 is mounted on the left bracket 2 by bolts and nuts; the left bracket 4 is mounted on the motor assembly 1 by bolts and connected to the left elastic bracket assembly 3. The right bracket 5 is mounted on the right longitudinal beam assembly 11 by bolts; the right elastic bracket assembly 6 is mounted on the right bracket 5 by bolts and nuts; the right bracket 7 is mounted on the motor assembly 1 by bolts and connected to the right elastic bracket assembly 6; the rear suspension assembly 8 is mounted on the motor assembly 1 by bolts and connected to the rear suspension bracket 9.

[0052] The left bracket 4, the right bracket 7, and the rear suspension assembly 8 jointly support the motor assembly 1; the left bracket 2, the right bracket 5, and the rear suspension bracket 9 jointly connect the motor assembly 1 to the left longitudinal beam assembly 10, the right longitudinal beam assembly 11, and the subframe assembly 12 respectively. The left elastic bracket assembly 3, the right elastic bracket assembly 6, and the rear suspension assembly 8 play the role of connection, shock absorption, and vibration isolation. As mentioned above, the rear suspension assembly 8 plays the role of supporting the motor assembly 1, and also plays the role of connection, shock absorption, and vibration isolation. That is, the rear suspension assembly 8 connects the motor assembly 1 and the rear suspension bracket 9, attenuating and isolating the vibration and torsional force transmitted from the motor assembly 1 to the rear suspension bracket 9.

[0053] The suspension unit of the embodiment of the present application adopts a hanging arrangement structure, and then a bracket and a support are set for each suspension assembly, that is, the left elastic support assembly 3 connects the left support 2 and the left support 4, the right elastic support assembly 6 connects the right support 5 and the right support 7, and the rear suspension assembly 8 connects the rear suspension support 9. This design improves the decoupling rate of the suspension unit, reduces the support reaction force of each suspension point, and reduces the displacement of each suspension cushion, thereby improving the reliability of the system and achieving a lightweight design, and is easy to install on the whole vehicle, thereby improving assembly efficiency.

[0054] When assembling the drive motor suspension system of the embodiment of the present application, the left bracket 2 is pre-installed on the left longitudinal beam assembly 10, the right bracket 5 is pre-installed on the right longitudinal beam assembly 11, and the rear suspension bracket 9 is first welded to the subframe assembly 12. The left elastic bracket assembly 3 is pre-installed on the left bracket 2, and the right elastic bracket assembly 6 is pre-installed on the right bracket 5. The left bracket 4, the right bracket 7, and the rear suspension assembly 8 are pre-installed on the motor assembly 1 to form a power assembly.

[0055] Use the lifting tool to assemble and connect the power assembly with the left elastic bracket assembly 3, the right elastic bracket assembly 6, and the rear suspension bracket 9 pre-installed on the vehicle body. The assembly order is to first tighten the nuts connecting the left bracket 4 and the left elastic bracket assembly, then tighten the connecting nuts of the right elastic bracket assembly 6 and the right bracket 7, and finally tighten the bolts and nuts connecting the rear suspension assembly 8 and the rear suspension bracket 9.

[0056] In some alternative embodiments: See Figures 2 to 4 As shown, the embodiment of the present application provides a drive motor suspension system, the dynamic stiffness directions of the left elastic bracket assembly 3 of the drive motor suspension system are respectively W1 direction, U1 direction and V1 direction, and the W1 direction of the left elastic bracket assembly 3 is parallel to the X direction of the whole vehicle, the U1 direction is parallel to the Y direction of the whole vehicle, and the V1 direction is parallel to the Z direction of the whole vehicle. The dynamic stiffness of the left elastic bracket assembly in the W1 direction, U1 direction and V1 direction are 300N.m, 150N.m and 580N.m respectively. By making the W1 direction of the left elastic bracket assembly 3 parallel to the X direction of the whole vehicle, the U1 direction is parallel to the Y direction of the whole vehicle, and the V1 direction is parallel to the Z direction of the whole vehicle, the maximum stiffness performance of the left elastic bracket assembly 3 can be brought into play.

[0057] The dynamic stiffness directions of the right elastic bracket assembly 6 are respectively W2, U2 and V21. The W2 direction of the right elastic bracket assembly is parallel to the X direction of the vehicle, the U2 direction is parallel to the Y direction of the vehicle, and the V2 direction is parallel to the Z direction of the vehicle. The dynamic stiffness of the right elastic bracket assembly in the W2 direction, U2 direction and V3 direction are 300N.m, 250N.m and 420N.m respectively. The W2 direction of the right elastic bracket assembly is parallel to the X direction of the vehicle, the U2 direction is parallel to the Y direction of the vehicle, and the V2 direction is parallel to the Z direction of the vehicle, so that the maximum stiffness performance of the right elastic bracket assembly 6 can be exerted.

[0058] The directions of the dynamic stiffness of the rear suspension assembly 8 are W3, U3 and V3, respectively. The W3 direction of the rear suspension assembly coincides with the line connecting the elastic center point of the rear suspension assembly and the output shaft of the motor assembly, the V3 direction is perpendicular to the line, and the U3 direction is parallel to the Y direction of the vehicle. The dynamic stiffness of the rear suspension assembly in the W3, U3 and V3 directions is 550N.m, 210N.m and 550N.m respectively.

[0059] When arranging the rear suspension assembly 8, the W3 direction is aligned with the line connecting the output shaft point O of the motor assembly 1 and the elastic center point of the rear suspension assembly 8, the V3 direction is perpendicular to the line, and the U3 direction (not shown) is the same as the Y direction of the vehicle; in this way, the maximum stiffness direction of the rear suspension assembly 8 can be consistent with the direction of the maximum torque M of the motor assembly 1, so that the maximum stiffness performance of the rear suspension assembly 8 can be brought into play.

[0060] The left elastic bracket assembly 3, the right elastic bracket assembly 6 and the rear suspension assembly 8 are arranged at three points around the motor assembly 1, and the direction of the larger dynamic stiffness of the left elastic bracket assembly 3, the right elastic bracket assembly 6 and the rear suspension assembly 8 is consistent with the X-axis direction of the vehicle. The arrangement of the left elastic bracket assembly 3, the right elastic bracket assembly 6 and the rear suspension assembly 8 adopts an XXX type arrangement, so that the direction of the larger dynamic stiffness of the left elastic bracket assembly 3, the right elastic bracket assembly 6 and the rear suspension assembly 8 is consistent with the X-axis direction of the vehicle, so that the suspension system obtains larger dynamic stiffness in the Z direction and X direction of the vehicle.

[0061] In some alternative embodiments: See Figure 5 As shown, the embodiment of the present application provides a drive motor suspension system, in which the mass center of the motor assembly 1 of the drive motor suspension system is point A, the elastic center point of the left elastic bracket assembly 3 is point B, the elastic center point of the right elastic bracket assembly 6 is point C, and the elastic center point of the rear suspension assembly 8 is point D. The distances between point A and point B, point C, and point D projected on the XOY plane of the vehicle are AB, AC, and AD, respectively. Under the condition that the space layout of the engine compartment allows, the distances of AB, AC, and AD are all the maximum values.

[0062] In the embodiment of the present application, the distances between point A and point B, point C and point D projected on the XOY plane of the vehicle are AB, AC and AD respectively, and under the condition that the engine compartment space layout permits, the distances AB, AC and AD are all maximized, which is beneficial to reducing the stress on the left elastic support assembly 3, the right elastic support assembly 6 and the rear suspension assembly 8, thereby improving the durability and reliability of the suspension system.

[0063] In some alternative embodiments: See Figure 6 As shown, the embodiment of the present application provides a drive motor suspension system, the center of mass of the motor assembly of the drive motor suspension system is point A, the elastic center point of the left elastic bracket assembly 3 is point B, the elastic center point of the right elastic bracket assembly 6 is point C, and the elastic center point of the rear suspension assembly 8 is point D. The distances between point A and point B, point C, and point D projected on the XOZ plane of the vehicle are AB, AC, and AD, respectively. Under the condition that the space layout of the engine compartment allows, the distances of AB, AC, and AD are all the maximum values.

[0064] In the embodiment of the present application, the distances between point A and point B, point C and point D projected on the XOZ plane of the vehicle are AB, AC and AD respectively, and the projections of point C and point D on the XOZ plane of the vehicle overlap each other. And under the condition that the space layout of the engine compartment allows, the distances of AB, AC and AD are all taken as the maximum value, which is conducive to reducing the force on the left elastic bracket assembly 3, the right elastic bracket assembly 6 and the rear suspension assembly 8, thereby improving the durability and reliability of the suspension system.

[0065] In some alternative embodiments: See Figure 7 As shown, an embodiment of the present application provides a drive motor suspension system, in which the motor assembly of the drive motor suspension system is arranged on the motor assembly 1 below the motor assembly 1 downward along the Z-axis direction of the whole vehicle when the distance between the rear suspension assembly 8 and the subframe assembly 12 in the X-axis direction of the whole vehicle is limited, and in order to consider the vehicle passability requirements, the ground clearance A of the rear suspension assembly 8 is greater than 200 mm.

[0066] The layout feature of the rear suspension assembly 8 of the embodiment of the present application is that when the vehicle is restricted in the X direction, it should be arranged as downward as possible in the Z direction of the vehicle, so as to reduce the support reaction force of the elastic center point of the rear suspension assembly 8 and reduce the displacement of the soft pad of the rear suspension assembly 8. The height of the rear suspension assembly 8 should also take into account the ground clearance requirements, that is, the ground clearance A of the rear suspension assembly 8 is recommended to be greater than 200mm to meet the vehicle's passability requirements.

[0067] The composition and arrangement structure of the drive motor suspension system of the embodiment of the present application; the matching of the directions of the three-dimensional stiffness of the left elastic support assembly 3, the right elastic support assembly 6 and the rear suspension assembly 8 with the X, Y and Z directions of the whole vehicle (energy decoupling method); the arrangement method of the distance between the center of mass of the motor assembly, the left elastic support assembly 3, the right elastic support assembly 6 and the elastic center point of the rear suspension assembly 8 (center of mass arrangement method), thereby ensuring the reliability of the drive motor suspension system.

[0068] The drive motor suspension system of the embodiment of the present application adopts a combination of an energy decoupling method and a center of mass arrangement method while adapting to the technical characteristics of the electric vehicle suspension system, and on this basis reasonably suspends the three-dimensional stiffness of each suspension, and adopts reasonable assembly technology principles and assembly positioning technology to optimize the installation position, installation angle and stiffness of the left elastic bracket assembly 3, the right elastic bracket assembly 6 and the rear suspension assembly 8, thereby improving the vibration isolation performance and ride comfort of the suspension system.

[0069] In some alternative embodiments: See Figure 8 As shown, the embodiment of the present application provides a drive motor suspension system, in which the left elastic bracket assembly 3 of the drive motor suspension system is provided with a first mounting hole 3247, a second mounting hole 3246 and a third mounting hole 3248 connected to the left bracket 4. The first mounting hole 3247 is located between the second mounting hole 3246 and the third mounting hole 3248, and the difference between the diameter of the first mounting hole 3247 and the diameter of the bolt on the left bracket 4 is less than or equal to 1mm, ensuring the assembly accuracy between the left elastic bracket assembly 3 and the left bracket 4. The second mounting hole 3246 and the third mounting hole 3248 are set as large round holes, and the difference between the diameter of the second mounting hole 3246 and the third mounting hole 3248 and the diameter of the bolt on the left bracket 4 is greater than or equal to 2mm, so that the adjustment amount can be increased and the assembly processability can be improved.

[0070] In some alternative embodiments: See Fig. 9 As shown, an embodiment of the present application provides a drive motor suspension system, wherein a fourth mounting hole 6111 and a fifth mounting hole 6112 connected to a right bracket 7 are provided on the right suspension assembly 6 of the drive motor suspension system, and the fourth mounting hole 6111 and the fifth mounting hole 6112 are spaced apart along the X2 direction of the vehicle, and the fourth mounting hole 6111 and the fifth mounting hole 6112 are both oblong holes extending along the Y-axis direction of the vehicle.

[0071] The difference between the diameter of the fourth mounting hole 6111 and the fifth mounting hole 6112 and the diameter of the bolt on the right bracket 7 is greater than or equal to 2 mm, and the distance between the center points of the two semicircular arcs of the fourth mounting hole 6111 and the fifth mounting hole 6112 is greater than 3 mm, which is used to increase the adjustment amount between the right suspension assembly 6 and the right bracket 7 and improve the assembly processability of the right suspension assembly 6 and the right bracket 7.

[0072] In some alternative embodiments: See Fig.10 As shown, the embodiment of the present application provides a drive motor suspension system, wherein the rear suspension bracket 9 of the drive motor suspension system is provided with a sixth mounting hole 9111 connected to the rear suspension assembly 8, and the rear suspension assembly 8 is provided with an inner hole connected to the rear suspension assembly 9. The rear suspension bracket 9 is connected with a bolt that penetrates the sixth mounting hole 9111 and the inner hole, and the difference between the diameter of the sixth mounting hole 9111 and the diameter of the bolt is greater than or equal to 2 mm, and the difference between the diameter of the inner hole and the diameter of the bolt is greater than or equal to 0.3 mm, so as to increase the adjustment amount between the rear suspension bracket 9 and the rear suspension assembly 8 and improve the assembly processability.

[0073] How it works

[0074] The embodiment of the present application provides a driving motor suspension system. Since the driving motor suspension system of the present application is provided with a frame, the frame includes a left longitudinal beam assembly 10 and a right longitudinal beam assembly 11 which are arranged at intervals from each other, and a sub-frame assembly 12 which is fixedly connected between the left longitudinal beam assembly 10 and the right longitudinal beam assembly 11; a motor assembly 1, which is located at the front side of the sub-frame assembly 12 and between the left longitudinal beam assembly 10 and the right longitudinal beam assembly 11;

[0075] A suspension unit, the suspension unit includes a left bracket 2 connected to a left longitudinal beam assembly 10, a right bracket 5 connected to a right longitudinal beam assembly 11; a left elastic bracket assembly 3 connected to the left bracket 2, a right elastic bracket assembly 6 connected to the right bracket 5; a left bracket 4 connected between the left elastic bracket assembly 3 and the motor assembly 1, a right bracket 7 connected between the right elastic bracket assembly 6 and the motor assembly 1; a rear suspension bracket 9 connected to a subframe assembly 12, and a rear suspension assembly 8 connected between the rear suspension bracket 9 and the motor assembly 1.

[0076] Therefore, the left bracket 4, the right bracket 7, and the rear suspension assembly 8 of the drive motor suspension system of the present application jointly support the motor assembly 1, and the left bracket 2, the right bracket 5, and the rear suspension bracket 9 jointly connect the motor assembly 1 to the left longitudinal beam assembly 10, the right longitudinal beam assembly 11 and the subframe assembly 12; the left elastic bracket assembly 3, the right elastic bracket assembly 6, and the rear suspension assembly 8 play the role of connection, shock absorption, and vibration isolation.

[0077] The rear suspension assembly 8 not only supports the motor assembly 1, but also serves as a connection, shock absorption, and vibration isolation. The rear suspension assembly 8 connects the motor assembly 1 and the rear suspension bracket 9, and attenuates and isolates the vibration and force transmitted from the motor assembly 1 to the rear suspension bracket 9. The suspension unit adopts a hanging arrangement structure, and then a bracket and a bracket are set for each suspension assembly. This design improves the decoupling rate of the suspension unit, reduces the support reaction force of each suspension point, and reduces the displacement of each suspension cushion, thereby improving the reliability of the system and achieving a lightweight design. It is also easy to install on the vehicle and improves assembly efficiency.

[0078] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0079] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0080] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A drive motor suspension system, characterized in that: include: A vehicle frame, the vehicle frame comprising a left longitudinal beam assembly (10) and a right longitudinal beam assembly (11) which are spaced apart from each other, and a sub-frame assembly (12) which is fixedly connected between the left longitudinal beam assembly (10) and the right longitudinal beam assembly (11); A motor assembly (1), the motor assembly (1) being located at the front side of the subframe assembly (12) and between the left longitudinal beam assembly (10) and the right longitudinal beam assembly (11); A suspension unit, the suspension unit comprising a left bracket (2) connected to the left longitudinal beam assembly (10), and a right bracket (5) connected to the right longitudinal beam assembly (11); A left elastic bracket assembly (3) connected to the left bracket (2), and a right elastic bracket assembly (6) connected to the right bracket (5); A left bracket (4) connected between the left elastic bracket assembly (3) and the motor assembly (1), and a right bracket (7) connected between the right elastic bracket assembly (6) and the motor assembly (1); A rear suspension bracket (9) connected to the auxiliary frame assembly (12), and a rear suspension assembly (8) connected between the rear suspension bracket (9) and the motor assembly (1).

2. A drive motor suspension system according to claim 1, characterized in that: The dynamic stiffness directions of the left elastic bracket assembly (3) are respectively W1 direction, U1 direction and V1 direction, the W1 direction of the left elastic bracket assembly (3) is parallel to the X direction of the whole vehicle, the U1 direction is parallel to the Y direction of the whole vehicle, and the V1 direction is parallel to the Z direction of the whole vehicle; The dynamic stiffness directions of the right elastic bracket assembly (6) are respectively W2 direction, U2 direction and V21 direction, wherein the W2 direction of the right elastic bracket assembly (6) is parallel to the X direction of the whole vehicle, the U2 direction is parallel to the Y direction of the whole vehicle, and the V2 direction is parallel to the Z direction of the whole vehicle; The directions of the dynamic stiffness of the rear suspension assembly (8) are respectively W3, U3 and V3. The W3 direction of the rear suspension assembly (8) coincides with a line connecting the elastic center point of the rear suspension assembly (8) and the output shaft of the motor assembly (8). The V3 direction is perpendicular to the line. The U3 direction is parallel to the Y direction of the vehicle.

3. A drive motor suspension system as claimed in claim 2, characterized in that: The dynamic stiffness of the left elastic support assembly (3) in the W1 direction, U1 direction, and V1 direction are 300 N.m, 150 N.m, and 580 N.m, respectively; the dynamic stiffness of the right elastic support assembly (6) in the W2 direction, U2 direction, and V3 direction are 300 N.m, 250 N.m, and 420 N.m, respectively; and the dynamic stiffness of the rear suspension assembly (8) in the W3 direction, U3 direction, and V3 direction are 550 N.m, 210 N.m, and 550 N.m, respectively.

4. A drive motor suspension system according to any one of claims 1 to 3, characterized in that: The center of mass of the motor assembly (1) is point A, the elastic center point of the left elastic bracket assembly (3) is point B, the elastic center point of the right elastic bracket assembly (6) is point C, and the elastic center point of the rear suspension assembly (6) is point D; The distances between the projections of point A and point B, point C and point D on the XOY plane of the vehicle are AB, AC and AD respectively. Under the condition that the space layout of the engine compartment allows, the distances of AB, AC and AD all take the maximum value.

5. A drive motor suspension system according to any one of claims 1 to 3, characterized in that: The center of mass of the motor assembly (1) is point A, the elastic center point of the left elastic bracket assembly (3) is point B, the elastic center point of the right elastic bracket assembly (6) is point C, and the elastic center point of the rear suspension assembly (8) is point D; The distances between the projections of point A and point B, point C and point D on the XOZ plane of the vehicle are AB, AC and AD respectively. Under the condition that the space layout of the engine compartment allows, the distances of AB, AC and AD all take the maximum value.

6. A drive motor suspension system as claimed in claim 4, characterized in that: When the distance between the rear suspension assembly (8) and the subframe assembly (12) in the X-axis direction of the vehicle is limited, the rear suspension assembly (8) is arranged on the motor assembly (1) downwardly along the Z-axis direction of the vehicle below the motor assembly (1), and the ground clearance of the rear suspension assembly (8) is greater than 200 mm.

7. A drive motor suspension system as claimed in claim 1, characterized in that: The left elastic bracket assembly (3) is provided with a first mounting hole (3247), a second mounting hole (3246) and a third mounting hole (3248) connected to the left bracket (2), and the connecting lines between the first mounting hole (3247), the second mounting hole (3246) and the third mounting hole (3248) form a triangle; The first mounting hole (3247) is located between the second mounting hole (3246) and the third mounting hole (3248); the difference between the diameter of the first mounting hole (3247) and the diameter of the bolt on the left bracket (4) is less than or equal to 1 mm; and the difference between the diameter of the second mounting hole (3246) and the third mounting hole (3248) and the diameter of the bolt on the left bracket (4) is greater than or equal to 2 mm.

8. A drive motor suspension system as claimed in claim 1, characterized in that: The right suspension assembly (6) is provided with a fourth mounting hole (6111) and a fifth mounting hole (6112) connected to the right bracket (7), and the fourth mounting hole (6111) and the fifth mounting hole (6112) are both oblong holes extending along the Y-axis direction of the vehicle; The difference between the diameter of the fourth mounting hole (6111) and the fifth mounting hole (6112) and the diameter of the bolt on the right bracket is greater than or equal to 2 mm, and the distance between the center points of the two semicircular arcs of the fourth mounting hole (6111) and the fifth mounting hole (6112) is greater than 3 mm.

9. A drive motor suspension system as claimed in claim 1, characterized in that: The rear suspension bracket (9) is provided with a sixth mounting hole (9111) connected to the rear suspension assembly (8), the rear suspension assembly (8) is provided with an inner hole connected to the rear suspension bracket (9), the rear suspension bracket (9) is connected with a bolt that penetrates the sixth mounting hole (9111) and the inner hole, the difference between the diameter of the sixth mounting hole (9111) and the diameter of the bolt is greater than or equal to 2 mm, and the difference between the diameter of the inner hole and the diameter of the bolt is greater than or equal to 0.3 mm.

10. A drive motor suspension system according to claim 1, characterized in that: The left elastic support assembly (3), the right elastic support assembly (6) and the rear suspension assembly (8) are arranged in a triangle on the peripheral side of the motor assembly (1), and the direction of the greater dynamic stiffness of the left elastic support assembly (3), the right elastic support assembly (6) and the rear suspension assembly (8) is consistent with the X-axis direction of the vehicle.

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