A drive motor suspension system

Abstract

The present application relates to a drive motor suspension system, comprising: a left longitudinal beam assembly and a right longitudinal beam assembly, and a subframe assembly fixedly connected between the left and right longitudinal beam assemblies; a motor assembly located on the front side of the subframe assembly and between the left and right longitudinal beam assemblies; a suspension unit comprising 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 subframe assembly, and a rear suspension assembly connected between the rear suspension bracket and the motor assembly. The present application 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.

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, modality and reliability.

[0003] When electric vehicles start and accelerate, the motor torque changes greatly and reaches the maximum torque quickly, which will cause a large impact load on the motor suspension system; when electric vehicles encounter 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 existing technology, automotive suspension system design typically involves determining the center of elasticity (hard point) of the suspension pad based on decoupling calculations. This is then used to arrange the suspension system and perform structural design. Specifically, this involves arranging and designing the components connecting the suspension pad to the motor and the vehicle frame. There are two decoupling calculation methods: torque-axis decoupling and energy decoupling. However, the torque-axis decoupling method is not suitable for electric vehicles, and the energy decoupling method also struggles to meet the requirements for electric vehicle suspension layout.

[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 present invention provides a drive motor mounting system that, while adapting to the technical characteristics of electric vehicle mounting systems, combines energy decoupling with center-of-mass placement. Based on this, it rationally controls the three-dimensional stiffness of each mount. Furthermore, it employs reasonable assembly principles and assembly positioning techniques. This addresses the problem in related art where mounting systems affect the durability and reliability of the vehicle and present difficulties in powertrain assembly.

[0007] An 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 spaced apart from each other, and a subframe assembly fixedly connected between the left longitudinal beam assembly and the right longitudinal beam assembly;

[0009] a motor assembly, the motor assembly being located on 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, U1 and V1, wherein the W1 direction of the left elastic bracket assembly is parallel to the X direction of the vehicle, the U1 direction is parallel to the Y direction of the vehicle, and the V1 direction is parallel to the Z direction of the vehicle;

[0015] The dynamic stiffness directions of the right elastic bracket assembly are W2, U2 and V21 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.

[0016] The dynamic stiffness directions 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 bracket 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 bracket 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 center of mass 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 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 engine compartment space layout allows, the distances AB, AC and AD all take the maximum value.

[0020] In some embodiments, the center of mass 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 point A and the projections of 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 engine compartment space layout allows, the distances 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. 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 elastic bracket 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 two semicircular arc center points 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 on the circumferential side of 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] An 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 spaced apart 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, which 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, which 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 drive 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, right longitudinal beam assembly, and subframe assembly; the left elastic bracket assembly, right elastic bracket assembly, and rear suspension assembly play the role of connection, shock absorption, and vibration isolation. The rear suspension assembly not only supports the motor assembly, but also plays the role of connection, shock absorption, and vibration isolation. The rear suspension assembly connects the motor assembly and the rear suspension bracket, attenuating and isolating the vibration and force transmitted from the motor assembly to the rear suspension bracket. The suspension unit adopts a hanging layout structure, and then a bracket and 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 whole vehicle and improves 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 following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

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

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

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

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

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

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

[0041] Figure 9 This is a structural diagram of the right elastic bracket assembly and the right bracket according to an embodiment of the present application;

[0042] Figure 10 This is a structural schematic 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] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] The embodiments of the present application provide a drive motor suspension system that can solve the problems in related technologies in which 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 spaced apart from each other, and a subframe assembly 12 fixedly connected between the left and right longitudinal beam assemblies 10 and 11. The motor assembly 1 is located in front of the subframe assembly 12 and between the left and right longitudinal beam assemblies 10 and 11. Figures 1 to 7 The X-axis is the length (front and back) of the vehicle, the Y-axis is the width (left and right) of the vehicle, and the Z-axis is the height (up and down) 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 is connected between the left elastic bracket assembly 3 and the motor assembly 1, a right bracket 7 is 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] In this embodiment of the present application, the left bracket 2 is bolted to the left longitudinal beam assembly 10; the left elastic bracket assembly 3 is bolted to the left bracket 2; the left bracket 4 is bolted to the motor assembly 1 and connected to the left elastic bracket assembly 3. The right bracket 5 is bolted to the right longitudinal beam assembly 11; the right elastic bracket assembly 6 is bolted to the right bracket 5 and connected to the right elastic bracket assembly 6; the right bracket 7 is bolted to the motor assembly 1 and connected to the right elastic bracket assembly 6; and the rear suspension assembly 8 is bolted to the motor assembly 1 and connected to the rear suspension bracket 9.

[0052] The left bracket 4, right bracket 7, and rear suspension assembly 8 jointly support the motor assembly 1; the left bracket 2, right bracket 5, and rear suspension bracket 9 jointly connect the motor assembly 1 to the left longitudinal beam assembly 10, right longitudinal beam assembly 11, and subframe assembly 12, respectively. The left elastic bracket assembly 3, right elastic bracket assembly 6, and rear suspension assembly 8 serve to connect, dampen, and isolate vibrations. As described above, the rear suspension assembly 8 serves not only to support the motor assembly 1, but also to connect, dampen, and isolate vibrations. 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 forces transmitted from the motor assembly 1 to the rear suspension bracket 9.

[0053] The suspension units in the present embodiment utilize a hanging-style layout, with brackets and supports provided for each suspension assembly. Specifically, the left elastic support assembly 3 connects the left bracket 2 and the left bracket 4, the right elastic support assembly 6 connects the right bracket 5 and the right bracket 7, and the rear suspension assembly 8 connects the rear suspension bracket 9. This design improves the decoupling rate of the suspension units, reduces the support reaction forces at each suspension point, and reduces the displacement of each suspension cushion, thereby enhancing system reliability and achieving a lightweight design. Furthermore, it facilitates installation on the vehicle and improves assembly efficiency.

[0054] During assembly of the drive motor suspension system of the present embodiment, 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 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, right bracket 7, and rear suspension assembly 8 are pre-installed on the motor assembly 1 to form a powertrain.

[0055] Use a lifting fixture to assemble and connect the powertrain to the pre-installed left and right elastic bracket assemblies 3 and 6, and rear suspension bracket 9. The assembly sequence is to first tighten the nuts connecting the left bracket 4 to the left elastic bracket assembly, then tighten the nuts connecting the right elastic bracket assembly 6 to the right bracket 7, and finally tighten the bolts and nuts connecting the rear suspension assembly 8 to the rear suspension bracket 9.

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

[0057] The dynamic stiffness of the right elastic support assembly 6 is measured in the W2, U2, and V21 directions, respectively. The W2 direction of the right elastic support assembly is parallel to the vehicle's X-direction, the U2 direction is parallel to the vehicle's Y-direction, and the V2 direction is parallel to the vehicle's Z-direction. The dynamic stiffness of the right elastic support assembly in the W2, U2, and V3 directions is 300 Nm, 250 Nm, and 420 Nm, respectively. By aligning the W2 direction of the right elastic support assembly with the vehicle's X-direction, the U2 direction with the vehicle's Y-direction, and the V2 direction with the vehicle's Z-direction, the right elastic support assembly 6 can maximize its stiffness.

[0058] The dynamic stiffness of the rear suspension assembly 8 is measured in the W3, U3, and V3 directions. The W3 direction coincides with the line connecting the rear suspension's elastic center and the motor assembly's output shaft. The V3 direction is perpendicular to this line, and the U3 direction is parallel to the vehicle's Y-axis. The dynamic stiffness of the rear suspension assembly in the W3, U3, and V3 directions is 550 Nm, 210 Nm, and 550 Nm, 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 connecting line, and the U3 direction (not shown) is aligned with the Y direction of the vehicle. This allows the direction of the maximum stiffness of the rear suspension assembly 8 to be consistent with the direction of the maximum torque M of the motor assembly 1, thereby maximizing the stiffness performance of the rear suspension assembly 8.

[0060] The left elastic support assembly 3, right elastic support assembly 6, and rear suspension assembly 8 are arranged at three points around the motor assembly 1. The direction of their maximum dynamic stiffness aligns with the vehicle's X-axis. The left elastic support assembly 3, right elastic support assembly 6, and rear suspension assembly 8 are arranged in an XXX-type configuration, aligning their maximum dynamic stiffness with the vehicle's X-axis. This ensures that the suspension system achieves maximum dynamic stiffness in both the Z and X directions.

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

[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 taken to the maximum value, which is beneficial to reducing the force 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, an 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 points B, C, and D, respectively, projected on the vehicle's XOZ plane, are AB, AC, and AD. As long as the engine compartment space layout allows, the distances AB, AC, and AD are all maximized.

[0064] In this embodiment, the distances between point A and points B, C, and D on the vehicle's XOZ plane are AB, AC, and AD, respectively. Points C and D are projected on the vehicle's XOZ plane to coincide with each other. As permitted by the engine compartment's spatial layout, the distances AB, AC, and AD are maximized. This helps reduce the forces acting on the left and right elastic support assemblies 3 and 6, as well as 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 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 downward along the Z-axis direction of the vehicle and below the motor assembly 1, 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 of the rear suspension assembly 8 in this embodiment of the present application is characterized by being positioned as downward as possible in the Z direction, given vehicle X-direction constraints. This reduces the support reaction force at the elastic center of the rear suspension assembly 8 and minimizes displacement of the rear suspension assembly 8's cushion. The height of the rear suspension assembly 8 also needs to take into account ground clearance requirements. Specifically, a ground clearance A of the rear suspension assembly 8 is recommended to be greater than 200 mm to meet vehicle trafficability requirements.

[0067] The composition and layout 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 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, an embodiment of the present application provides a drive motor suspension system, wherein 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 for connecting to the left bracket 4. 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, 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 configured as large circular holes. 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. This can increase the adjustment range and improve assembly processability.

[0070] In some alternative embodiments: See Figure 9 As shown, an embodiment of the present application provides a drive motor suspension system, in which the right elastic bracket assembly 6 of the drive motor suspension system 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 arranged at intervals 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 elastic bracket assembly 6 and the right bracket 7, and improve the assembly processability of the right elastic bracket assembly 6 and the right bracket 7.

[0072] In some alternative embodiments: See Figure 10 As shown, an embodiment of the present application provides a drive motor suspension system, wherein a sixth mounting hole 9111 is provided on the rear suspension bracket 9 of the drive motor suspension system for connection to the rear suspension assembly 8, and an inner hole is provided on the rear suspension assembly 8 for connection to the rear suspension assembly 9. A bolt is connected to the rear suspension bracket 9 and 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. This is used to increase the adjustment between the rear suspension bracket 9 and the rear suspension assembly 8, thereby improving assembly processability.

[0073] How it works

[0074] 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 vehicle frame, the vehicle frame includes a left longitudinal beam assembly 10 and a right longitudinal beam assembly 11 spaced apart from each other, and a sub-frame assembly 12 fixedly connected between the left longitudinal beam assembly 10 and the right longitudinal beam assembly 11; a motor assembly 1, which is located on 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] 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, 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 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, right bracket 7, and 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, right bracket 5, and 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 provides connection, shock absorption, and vibration isolation. It connects the motor assembly 1 to the rear suspension bracket 9, attenuating and isolating vibrations and forces transmitted from the motor assembly 1 to the rear suspension bracket 9. The suspension unit utilizes a hanging-style layout, with brackets and supports provided for each suspension assembly. This design improves the decoupling ratio of the suspension unit, reduces the support reaction forces at each suspension point, and minimizes the displacement of each suspension cushion, thereby enhancing system reliability and achieving a lightweight design. It also facilitates vehicle installation and improves assembly efficiency.

[0078] In the description of this application, it should be noted that the terms "upper" and "lower" and the like 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 this application and simplifying the description, and do not indicate or imply 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 this 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this 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 used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any 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 comprising 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, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0080] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

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) spaced apart from each other, and a sub-frame assembly (12) 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 on 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 subframe assembly (12), and a rear suspension assembly (8) connected between the rear suspension bracket (9) and the motor assembly (1); The dynamic stiffness directions of the left elastic bracket assembly (3) are respectively W1, U1 and V1, wherein the W1 direction of the left elastic bracket assembly (3) is parallel to the X direction of the vehicle, the U1 direction is parallel to the Y direction of the vehicle, and the V1 direction is parallel to the Z direction of the 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 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 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 the 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, and the U3 direction is parallel to the Y direction of the vehicle; The dynamic stiffness of the left elastic bracket 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 bracket assembly (6) 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 (8) in the W3 direction, U3 direction, and V3 direction are 550 N.m, 210 N.m, and 550 N.m, respectively.

2. The drive motor suspension system according to claim 1, wherein: 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 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 engine compartment space layout allows, the distances AB, AC and AD all take the maximum value.

3. The drive motor suspension system according to claim 1, wherein: 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 point A and the projections of 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 engine compartment space layout allows, the distances AB, AC and AD all take the maximum value.

4. The drive motor suspension system according to claim 2, wherein: 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) downward 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.

5. The drive motor suspension system according to claim 1, wherein: 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.

6. The drive motor suspension system according to claim 1, wherein: The right elastic bracket assembly (6) is provided with a fourth mounting hole (6111) and a fifth mounting hole (6112) for connecting 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 two semicircular arc center points of the fourth mounting hole (6111) and the fifth mounting hole (6112) is greater than 3 mm.

7. The drive motor suspension system according to claim 1, wherein: The rear suspension bracket (9) is provided with a sixth mounting hole (9111) for connecting to the rear suspension assembly (8), the rear suspension assembly (8) is provided with an inner hole for connecting 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.

8. The drive motor suspension system according to claim 1, wherein: The left elastic support assembly (3), the right elastic support assembly (6) and the rear suspension assembly (8) are arranged in a triangular shape on the circumference of the motor assembly (1), and the direction of the maximum 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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