A dual-motor power uninterrupted emt assembly suspension system structure

Abstract

The application discloses a kind of double-motor power uninterrupted EMT assembly suspension system structure and method, including frame and EMT assembly, EMT assembly includes motor suspension and gearbox suspension, the inside wall surface of frame is provided with four suspension soft pad assemblies, two opposite arrangement suspension soft pad assemblies are connected with motor suspension support, and the other two opposite arrangement suspension soft pad assemblies are connected with gearbox suspension support, motor suspension support is connected with the suspension connecting hole of motor front end cover, and gearbox suspension support is connected with the suspension connecting hole of gearbox suspension side face.This application motor and gearbox suspension are all used two-point horizontal installation structure, motor suspension support is connected with the installation hole of motor front end cover two sides, upper side by bolt, the upper portion of motor suspension support is connected with motor suspension soft pad assembly as a whole, and gearbox suspension support is L-shaped structure, its side face is connected with gearbox side face installation hole, and its upper portion is connected with gearbox suspension soft pad assembly as a whole.

Description

Technical Field

[0001] This invention belongs to the technical field of EMT assembly mounting system, specifically relating to a dual-motor uninterrupted power EMT assembly mounting system. Background Technology

[0002] Existing motor and gearbox assembly mounting systems mostly employ a four-point under-mount structure, with the motor mount using a two-point V-shaped under-mount structure and the gearbox mount using a two-point horizontal under-mount structure. These existing technologies have the following drawbacks: 1. The mounting bracket passes under the motor and gearbox assembly, resulting in the lowest height of the mounting system being lower than the assembly, impacting the vehicle's passability; 2. Due to the thinness of the motor housing, there are no motor mount mounting holes on the side of the housing. Instead, these holes are located on the connecting plate of the front and rear end covers of the motor. This transition plate connects to the holes on the sides of the front and rear end covers, and the motor mount bracket then connects to the reserved holes on the connecting plate. This complex connection structure results in heavy weight and high cost; 3. The gearbox is mounted on a lower support beam, which spans the frame and connects to the outer surface of the frame. This complex connection structure also results in heavy weight and high cost.

[0003] To address the aforementioned technical issues, Chinese invention patent CN115384291A discloses a motor-gearbox assembly mounting system structure. This structure includes a motor mount bracket transition plate, a crossbeam, a motor mount pad assembly, a motor mount bracket, a gearbox mount bracket, and a gearbox mount pad assembly. The end of the motor mount bracket transition plate is fixedly connected to the middle of the crossbeam, and both sides of the crossbeam are fixedly connected to the web surface of the longitudinal beam via the motor mount pad assembly and the motor mount bracket. Both sides of the gearbox assembly are fixedly mounted between the longitudinal beams via gearbox mount brackets. The sides of the gearbox mount brackets are fixedly connected to the gearbox assembly, and the ends are fixedly connected to the web surface of the vehicle frame longitudinal beam via the gearbox mount pad assembly. While this technical solution is suitable for EMT assemblies with a single motor, a small motor Y-axis width, and low system torque, its application to EMT assemblies with dual motors, a larger motor Y-axis width, and higher system torque presents the following drawbacks: 1. The connection structure between the motor mount and the motor (crossbeam and L-plate) is relatively complex, heavy, and costly; 2. The dual-mount structure of the motor mount occupies a large space in the Y-axis, and there is no space for the motor mount bracket to be arranged on the side; 3. The crossbeam spans the Y-axis of the vehicle frame, resulting in a low modal frequency, which poses a risk of resonance with the motor excitation frequency and affects the overall NVH performance of the vehicle; 4. Under high torque conditions, the rigidity of the crossbeam is low, posing an NVH risk; 5. The mount has poor versatility for vehicle models with different frame thicknesses.

[0004] Therefore, there is an urgent need to develop a dual-motor uninterrupted power EMT assembly mounting system structure to solve the above-mentioned technical problems. Summary of the Invention

[0005] In view of the problems existing in the background technology, the purpose of this invention is to provide a dual-motor uninterrupted power EMT assembly mounting system structure.

[0006] To achieve the above objectives, this invention discloses a dual-motor uninterrupted power EMT assembly mounting system structure, which includes a vehicle frame and an EMT assembly. The EMT assembly includes a motor mount and a gearbox mount. Four mounting pad assemblies are provided on the inner side wall of the vehicle frame. Motor mount brackets are connected to two oppositely arranged mounting pad assemblies, and gearbox mount brackets are connected to the other two oppositely arranged mounting pad assemblies. The motor mount brackets are connected to the mounting connection holes of the motor front end cover, and the gearbox mount brackets are connected to the mounting connection holes on the side of the gearbox mount.

[0007] In a preferred embodiment of the present invention, the suspension pad assembly includes a suspension pad and a suspension plate.

[0008] In a preferred embodiment of the present invention, the suspension pad is provided with a first hole for connecting the motor suspension bracket or the gearbox suspension bracket and a second hole for connecting the vehicle frame, wherein the central axis of the first hole and the central axis of the second hole are perpendicular to each other, and the second hole is perpendicular to the inner wall surface of the vehicle frame.

[0009] In a preferred embodiment of the present invention, the suspension pad is provided with mounting holes and weight reduction holes that correspond one-to-one with the second hole.

[0010] In a preferred embodiment of the present invention, the gearbox mounting bracket includes a first feature portion for connecting the mounting pad assembly and a second feature portion for connecting the mounting connection hole. The first feature portion and the second feature portion are arranged perpendicular to each other. A third hole is machined on the first feature portion and a fourth hole is machined on the second feature portion. The central axis of the third hole and the central axis of the fourth hole are perpendicular to each other. Both the third hole and the fourth hole are parallel to the inner wall surface of the vehicle frame.

[0011] In a preferred embodiment of the present invention, the second feature portion includes a first boss and a second boss with different heights.

[0012] In a preferred embodiment of the present invention, each of the first boss and the second boss is provided with a weight-reducing hole, and a reinforcing rib is provided between the first boss and the second boss.

[0013] In a preferred embodiment of the present invention, two third holes are provided on the first feature portion, two fourth holes are provided on the first boss, and two fourth holes are provided on the second boss. The distance between the central axis of the fourth hole located on the upper right of the plane where the second feature portion is located and the central axis of the third hole is A. The distance between the central axis of the fourth hole located on the upper right of the plane where the second feature portion is located and the upper end face of the first feature portion is B. The thickness of the first boss is C, where A≤120mm, B≤140mm, and C≤70mm.

[0014] In a preferred embodiment of the present invention, the gearbox mounting bracket is L-shaped, and the gearbox mounting bracket is provided with a fifth hole and a sixth hole that are perpendicular to each other. The fifth hole is parallel to the inner wall of the vehicle frame, and the sixth hole is perpendicular to the inner wall of the vehicle frame.

[0015] In a preferred embodiment of the present invention, the distance from the central axis of the sixth hole to the upper end face of the fifth hole is E, and the distance from the fifth hole to the outer edge of the gearbox mounting bracket and the gearbox mounting pad mounting boss is D, where D≤100mm and E≤170mm.

[0016] The beneficial effects of this invention are as follows: This invention overcomes the shortcomings of the prior art and has the following advantages: 1. Due to the large Y-axis dimension of the dual-motor housing, there is no space for the motor mounting bracket to be arranged on the side. This invention innovatively proposes that the motor mounting bracket and the motor be connected on the front end cover of the motor, and the motor mounting pad is still arranged inside the belly surface of the frame, realizing a side-mounted vertical installation. The connection structure between the motor mounting pad and the motor is simple, lightweight, and low in cost. 2. The motor and gearbox mounting pad assemblies of this invention are both vertically mounted structures, with good assembly processability and small space occupation in the Y-axis of the frame. 3. The motor and gearbox mounting brackets of this invention are both castings with high constraint modes, both greater than 400Hz, and the risk of resonance with the motor excitation frequency is small. 4. The motor mounting bracket of this invention has high rigidity, meeting the requirements of high torque conditions. 5. The mounting pad assembly of this invention can be universal for different frame thickness models. Different thickness pads are used to adapt to different frame thicknesses, resulting in good versatility of the mounting pad assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is an isometric view of the present invention;

[0019] Figure 3 This is a schematic diagram of the present invention;

[0020] Figure 4 This is a schematic diagram of the suspension assembly of this invention;

[0021] Figure 5This is a schematic diagram of the motor mounting bracket of this invention;

[0022] Figure 6 This is the suspension pad of the present invention;

[0023] Figure 7 This is a schematic diagram of the suspension pad of this invention;

[0024] Figure 8 This is a schematic diagram of the gearbox mounting bracket of the present invention;

[0025] Figure 9 This is a front view of the motor suspension bracket of the present invention;

[0026] Figure 10 This is a side view of the motor suspension bracket of the present invention;

[0027] Figure 11 This is a front view of the gearbox mounting bracket of the present invention;

[0028] Figure 12 This is a simulation implementation of the present invention. Detailed Implementation

[0029] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1-11 As shown, this invention provides a dual-motor uninterrupted power EMT assembly mounting system structure. Both the motor and gearbox mounts employ a two-point horizontal mounting structure. Both the motor and gearbox mount pad assemblies are fully enclosed structures, installed inside the chassis frame. The motor mount bracket is connected to mounting holes on both sides and slightly above the motor front cover via bolts. The upper part of the motor mount bracket is integrally connected to the motor mount pad assembly. The gearbox mount bracket has an L-shaped structure, with its side connected to mounting holes on the side of the gearbox, and its upper part integrally connected to the gearbox mount pad assembly. Specifically, it includes a chassis frame and an EMT assembly. The EMT assembly includes motor mounts and gearbox mounts. The invention is characterized by four mount pad assemblies disposed on the inner wall of the chassis frame. Two of these assemblies, arranged opposite each other, are connected to motor mount brackets, and the other two oppositely arranged mount pad assemblies are connected to gearbox mount brackets. The motor mount bracket is connected to the mount connection holes on the motor front cover, and the gearbox mount bracket is connected to the mount connection holes on the side of the gearbox mount.

[0031] Preferably, both the motor mount and the gearbox mount of the present invention are cast structures, and the mount pad assembly is a fully enclosed structure. Both the mount pad 2 and the mount plate 3 are cast. The mount pad 2 has second holes 22 distributed on a 60x50 standard hole grid. The stiffness of the motor and gearbox mount pads may be the same or different depending on matching requirements. The motor mount bracket 1 is bolted to the motor front cover mounting hole 41. The gearbox mount bracket is bolted to the gearbox mount side mounting hole. The gearbox mount pad assembly connects the motor mount pad assembly and the mount plate to the vehicle frame belly surface via bolts. The upper part of the gearbox mount bracket is bolted to the gearbox mount pad assembly as a single unit.

[0032] The mounting holes for the pad bracket of the motor / transmission suspension pad assembly 2 and the mounting holes for the suspension pad 3 are distributed on a 60X50mm grid. For models with different frame wall thicknesses, the thickness of the suspension pad 3 can be adjusted accordingly. The suspension pad assembly can be universal for different models, which greatly improves the universality of the motor and transmission suspension pad assembly.

[0033] The suspension pad assembly of the present invention includes a suspension pad 2 and a suspension plate 3. The suspension pad 2 is provided with a first hole 21 for connecting a motor suspension bracket or a gearbox suspension bracket and a second hole 22 for connecting to the vehicle frame. The central axes of the first hole 21 and the second hole 22 are perpendicular to each other, and the second hole 22 is perpendicular to the inner wall of the vehicle frame. This design ensures that the suspension pad assembly can effectively connect the vehicle frame and the bracket, while providing good vibration damping.

[0034] The suspension plate 3 is provided with mounting holes 31 and weight reduction holes 32 that correspond one-to-one with the second hole 22. The design of the weight reduction holes 32 can effectively reduce the overall weight while ensuring structural strength.

[0035] The transmission mount bracket of the present invention includes a first feature portion 11 for connecting the suspension pad assembly and a second feature portion 12 for connecting the suspension connection hole. The first feature portion 11 and the second feature portion 12 are arranged perpendicularly to each other, forming an L-shaped structure. A third hole 13 is machined on the first feature portion 11, and a fourth hole 14 is machined on the second feature portion 12. The central axis of the third hole 13 and the central axis of the fourth hole 14 are perpendicular to each other, and both the third hole 13 and the fourth hole 14 are parallel to the inner wall surface of the vehicle frame. This design ensures that the transmission mount bracket can securely connect the suspension pad assembly and the transmission.

[0036] The second feature 12 includes a first boss and a second boss of different heights. Each of the first boss and the second boss is provided with a weight-reducing hole 15, and a reinforcing rib 16 is provided between the first boss and the second boss. This design can reduce weight while ensuring structural strength.

[0037] To further optimize the structure, the first feature portion 11 is provided with two third holes 13, the first boss is provided with two fourth holes 14, and the second boss is provided with two fourth holes 14. The distance between the central axis of the fourth hole 14 located on the upper right of the plane of the second feature portion 12 and the central axis of the third hole 13 is 50mm. The distance between the central axis of the fourth hole 14 located on the upper right of the plane of the second feature portion 12 and the upper end face of the first feature portion 11 is 48mm. The thickness of the first boss is 54mm. These specific dimensional parameters can be fine-tuned according to actual application requirements.

[0038] Specifically, the first-order constraint modes of the motor mount bracket 1 and the gearbox mount bracket are 2720Hz and 722Hz, respectively, both greater than 400Hz. This avoids the risk of resonance between the motor excitation frequency and the mount bracket in the commonly used speed range (the motor excitation frequency in the commonly used speed range is 0-300Hz; the constraint mode of the existing gearbox mount lower support beam assembly is 80Hz, which does not avoid the motor excitation frequency in the commonly used speed range and poses a resonance risk), thus improving the NVH performance of the motor assembly mount system. The distance from the upper right mounting hole of the motor mount bracket 1 to the center of the mounting hole between the motor mount bracket and the motor mount pad is 50mm; the distance from the upper right mounting hole of the motor mount bracket 1 to the contact surface of the connecting bolt between the motor mount bracket and the motor mount pad is 48mm; and the thickness of the upper transition boss of the motor mount bracket 1 is 54mm. The distance from the center of the upper row of mounting holes 32 of the transmission mount to the mating surface of the transmission mount and the mounting bolt of the transmission mount pad is 117mm, and the distance from the upper row of mounting holes of the transmission mount to the outer edge of the mounting boss of the transmission mount and the transmission mount pad is 73mm.

[0039] The motor mount bracket of this invention is L-shaped, and has a fifth hole 41 and a sixth hole 42 that are perpendicular to each other. The fifth hole 41 is parallel to the inner wall of the frame, and the sixth hole 42 is perpendicular to the inner wall of the frame. The distance from the central axis of the sixth hole 42 to the upper end face of the fifth hole 41 is 117mm, and the distance from the fifth hole 41 to the outer edge of the motor mount bracket and the motor mount pad mounting boss is 73mm. This design ensures that the motor mount bracket can stably connect the mount pad assembly and the motor.

[0040] like Figure 9-12 As shown, the motor mount of the present invention is a two-point side-connected vertical mounting structure: the motor mount bracket is "7" shaped, the lower part of the "7" shaped motor mount bracket is directly connected to the mount connection hole of the front end cover of the motor, and the upper end of the "7" shaped motor mount bracket is vertically connected to the motor mount soft pad assembly, which is mounted on the belly surface of the vehicle frame.

[0041] The transmission mount of the present invention is a two-point side-connected vertical mounting structure: the transmission mount bracket is L-shaped, the side of the L-shaped transmission mount bracket is directly connected to the mounting connection hole on the side of the transmission, the upper end of the L-shaped transmission mount bracket is vertically connected to the transmission mount soft pad assembly, and the transmission mount soft pad assembly is mounted on the belly surface of the vehicle frame.

[0042] The connection and mounting holes between the motor and gearbox suspension pad assembly and the vehicle frame in this invention are all designed as standard holes, 60X50mm.

[0043] The motor / gearbox suspension pad assembly of the present invention is designed with a suspension pad plate between the motor / gearbox suspension pad assembly and the vehicle frame to adapt to vehicle frames of different thicknesses, thus ensuring the versatility of the motor / gearbox suspension pad assembly.

[0044] The mounting holes for connecting the suspension pad to the vehicle frame in this invention are designed as standard holes, 60X50mm, which are consistent with the mounting holes for the suspension pad assembly to the vehicle frame.

[0045] The distance A from the upper right mounting hole of the motor suspension bracket to the center of the mounting hole of the motor suspension bracket and the motor suspension pad is ≤120mm, the distance B from the upper right mounting hole of the motor suspension bracket to the contact surface of the mounting bolt of the motor suspension bracket and the suspension pad is ≤140mm, and the thickness C of the transition boss of the motor suspension bracket is ≤70mm.

[0046] In this invention, the distance D from the gearbox mounting bracket and the gearbox mounting surface to the outer end of the boss on the gearbox mounting bracket and the gearbox mounting pad mounting surface is ≤100mm, and the distance E from the upper row of mounting holes of the gearbox mounting bracket and the gearbox mounting pad to the mating surface of the mounting bolts of the gearbox mounting bracket and the gearbox mounting pad is ≤170mm.

[0047] The comparison of the first-order modal and weight characteristics of the motor suspension bracket of the present invention is shown in the table below:

[0048]

[0049]

[0050] The dual-motor uninterrupted power EMT assembly mounting system structure of the present invention achieves the following technical effects through optimized design of the mounting pad assembly, gearbox mounting bracket, and motor mounting bracket:

[0051] 1. Improved system stiffness and stability, effectively reducing vibration and noise of the EMT assembly.

[0052] 2. The connection structure has been simplified, the overall weight has been reduced, and the manufacturing cost has been lowered.

[0053] 3. Improved space utilization, providing a more reasonable layout scheme for dual-motor systems.

[0054] 4. The system's versatility has been enhanced, making it applicable to vehicle models with different frame thicknesses.

[0055] 5. Improved the overall NVH performance of the vehicle, especially under high torque conditions.

[0056] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A dual-motor uninterrupted power EMT assembly mounting system structure, comprising a vehicle frame and an EMT assembly, wherein the EMT assembly includes a motor mount and a gearbox mount, characterized in that: Four suspension pad assemblies are provided on the inner wall of the vehicle frame. Two oppositely arranged suspension pad assemblies are connected to motor suspension brackets, and the other two oppositely arranged suspension pad assemblies are connected to gearbox suspension brackets. The motor suspension bracket is connected to the suspension connection hole of the motor front end cover, and the gearbox suspension bracket is connected to the suspension connection hole on the side of the gearbox suspension. The suspension pad assembly includes a suspension pad (2) and a suspension pad plate (3). The suspension pad (2) is provided with a first hole (21) for connecting the motor suspension bracket or the gearbox suspension bracket and a second hole (22) for connecting the vehicle frame. The central axis of the first hole (21) and the central axis of the second hole (22) are perpendicular to each other, and the second hole (22) is perpendicular to the inner wall of the vehicle frame. The motor suspension bracket includes a first feature part (11) for connecting the suspension pad assembly and a second feature part (12) for connecting the suspension connection hole. The first feature part (11) and the second feature part (12) are perpendicular to each other. The first feature (11) and the second feature (12) are arranged perpendicularly to each other. The first feature (11) has a third hole (13) machined on it, and the second feature (12) has a fourth hole (14) machined on it. The central axis of the third hole (13) and the central axis of the fourth hole (14) are perpendicular to each other. The third hole (13) and the fourth hole (14) are both parallel to the inner wall of the frame. The second feature (12) includes a first boss and a second boss of different heights. The first feature (11) is provided with two third holes (13). Two fourth holes (14) are provided on the boss. Two fourth holes (14) are provided on the second boss. The distance between the central axis of the fourth hole (14) located on the upper right of the plane where the second feature part (12) is located and the central axis of the third hole (13) is A. The distance between the central axis of the fourth hole (14) located on the upper right of the plane where the second feature part (12) is located and the upper end face of the first feature part (11) is B. The thickness of the first boss is C. A≤120mm, B≤140mm, C≤70mm.

2. The dual-motor uninterrupted power EMT assembly mounting system structure according to claim 1, characterized in that: The suspension pad (3) is provided with mounting holes (31) and weight reduction holes (32) that correspond one-to-one with the second hole (22).

3. The dual-motor uninterrupted power EMT assembly mounting system structure according to claim 1, characterized in that: The first boss and the second boss are each provided with a weight reduction hole (15), and a reinforcing rib (16) is provided between the first boss and the second boss.

4. The dual-motor uninterrupted power EMT assembly mounting system structure according to claim 1, characterized in that: The gearbox mounting bracket is L-shaped, and the gearbox mounting bracket is provided with a fifth hole (41) and a sixth hole (42) that are perpendicular to each other. The fifth hole (41) is parallel to the inner wall of the frame, and the sixth hole (42) is perpendicular to the inner wall of the frame.

5. The dual-motor uninterrupted power EMT assembly mounting system structure according to claim 4, characterized in that: The distance from the central axis of the sixth hole (42) to the upper surface of the fifth hole (41) is E, and the distance from the fifth hole (41) to the outer edge of the gearbox mounting bracket and the gearbox mounting pad mounting boss is D, where D≤100mm and E≤170mm.

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