Rear suspension system of hybrid electric vehicle

Abstract

The invention relates to a rear suspension system of a hybrid electric vehicle, which comprises a frame, a power assembly, a bracket assembly, a left bracket rear suspension, a right bracket rear suspension and a cushion assembly, and the bracket assembly comprises a left bracket rear suspension, a right bracket rear suspension and a pocket beam. The right support rear suspension is of a flat-plate-shaped integrated casting forming structure, and the right support rear suspension and the left support rear suspension are symmetrical parts. The bracket assembly is of an integral structure formed by welding a left bracket rear suspension, a right bracket rear suspension and a pocket beam, the left bracket rear suspension and the right bracket rear suspension are connected with a frame through two mounting surfaces, and the structure is designed according to the arrangement space change; reasonable avoidance is carried out on the structure, the limitation of the arrangement space is overcome, and the modal and strength requirements are met; the reliability of the system is ensured, so that the reliability of the whole vehicle is ensured; and the bracket assembly is integrated with the third cross beam of the frame, so that the functions of physical structure integration and function integration are achieved, meanwhile, the function of light weight is achieved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a rear suspension system of a hybrid electric vehicle. Background Art

[0002] In the prior art, hybrid electric vehicles have two power systems, namely a fuel engine system and an electric drive system. The cost of the entire vehicle is higher than that of traditional fuel vehicles and pure electric vehicles, and the cost of the entire vehicle is composed of the costs of each system; the various systems are assembled and connected together in a building block-like combination method. Among them, the rear suspension system device of the common powertrain is to set a frame crossbeam above the Z direction of the rear suspension and hang the rear suspension system device on the frame crossbeam, which results in a complex structure and high cost.

[0003] In the prior art, when the vehicle development enters the installation and trial production stage, the pneumatic or electric assembly tools (air gun, electric gun) of the rear suspension system often interfere with the parts during the installation process, making it impossible to use the pneumatic or electric assembly tools, thereby causing low assembly efficiency or affecting assembly quality. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a hybrid vehicle rear suspension system that can meet both the spatial installation structure requirements and the component modal and strength performance requirements.

[0005] The technical solution adopted by the present invention is: a hybrid vehicle rear suspension system, characterized in that it includes a frame, a powertrain, a bracket assembly, a left bracket rear suspension, a right bracket rear suspension, and a cushion assembly, wherein the bracket assembly includes a left bracket rear suspension, a right bracket rear suspension, and a pocket beam, wherein one end of the pocket beam is fixedly connected to one side of the frame through the left bracket rear suspension, and the other end is fixedly connected to the other side of the frame through the right bracket rear suspension; one end of the left bracket rear suspension is fixedly connected to the cushion assembly and the left bracket rear suspension, and the other end is fixedly connected to one side of the powertrain; one end of the right bracket rear suspension is fixedly connected to the right bracket rear suspension through the cushion assembly, and the other end is fixedly connected to the other side of the powertrain.

[0006] Preferably, the pocket beam comprises a first straight line segment, a second straight line segment, a third straight line segment, a fourth straight line segment, a fifth straight line segment, a sixth straight line segment and a seventh straight line segment, wherein the first straight line segment is arranged in the middle, one end of which is connected to the second straight line segment, the third straight line segment and the fourth straight line segment in sequence, and the other end of which is connected to the fifth straight line segment, the sixth straight line segment and the seventh straight line segment in sequence.

[0007] Preferably, the pocket beam is low in the middle and high at both ends; the fourth straight line segment is at the highest point at one end of the pocket beam, and is fixedly connected to the left bracket rear suspension; the seventh straight line segment is at the highest point at the other end of the pocket beam, and is fixedly connected to the right bracket rear suspension; the first straight line segment is the lowest point in the middle of the pocket beam, and the gap with the ground is greater than the minimum ground clearance of the vehicle.

[0008] Preferably, the clearance between the motion envelope circle of the pocket beam and the transmission shaft is greater than 40 mm.

[0009] Preferably, the power assembly includes an engine assembly and an electric drive assembly, the electric drive assembly is connected to the engine assembly, the electric drive assembly includes a transmission, a motor A and a motor B, and the motor A and the motor B are connected to the transmission side by side.

[0010] Preferably, the left bracket rear suspension and the right bracket rear suspension are symmetrical parts, and the right bracket rear suspension includes an electric drive assembly connecting plate, a transition plate, a cushion connecting plate, a first reinforcement rib and a second reinforcement rib. The electric drive assembly connecting plate and the cushion connecting plate are both flat plate structures and are no longer in the same plane; the electric drive assembly connecting plate is fixedly connected to the power assembly, and a second reinforcement rib is provided on the lower surface of the electric drive assembly connecting plate; the cushion connecting plate is fixedly connected to the cushion assembly, and a first reinforcement rib is provided on the upper surface of the cushion connecting plate.

[0011] Preferably, the minimum distance between the electric drive assembly connecting plate and the cushion connecting plate is 23 mm, and the angle between the two planes is 3.5°.

[0012] Preferably, the left bracket rear suspension is made of QT450 ductile iron material and is formed by an integrated casting process; it includes a left frame mounting plate A, a left frame mounting plate B and a left cushion mounting plate; the left frame mounting plate A and the left frame mounting plate B are fixedly connected to the frame, and both the left frame mounting plate A and the left frame mounting plate B are provided with bosses that contact and cooperate with the frame; the left cushion mounting plate is provided with a tapered hole and a guide hole for installing the cushion assembly, and the side wall of the left cushion mounting plate is provided with a left pocket beam mounting hole.

[0013] Preferably, the right bracket rear suspension is formed by an integrated casting process and uses QT450 ductile iron material; the right bracket rear suspension includes a right frame mounting plate A, a right frame mounting plate B, a connecting plate and a right cushion mounting plate; the right frame mounting plate A and the right frame mounting plate B are fixedly connected to the frame, and the right frame mounting plate A and the right frame mounting plate B are both provided with bosses that contact and cooperate with the frame; the right cushion mounting plate is provided with a tapered hole and a guide hole for installing the cushion assembly, and the side wall of the right cushion mounting plate is provided with a right pocket beam mounting hole.

[0014] Preferably, the cushion assembly includes a cover and a cushion body arranged in the cover, and the cushion body includes an upper cover, a lower cover and a rubber cushion; a rubber cushion is provided between the upper cover and the lower cover, which are connected together by a vulcanization process; a welding stud is provided on the upper cover for connecting with the rear suspension of the left bracket; the lower cover is provided with a cone for connecting with the rear suspension of the left bracket; an arrow mark is provided on the rubber cushion to indicate the installation direction of the cushion assembly; a buffer rubber block is vulcanized on the flange of the lower cover.

[0015] The beneficial effects achieved by the present invention are as follows: the right bracket rear suspension adopts a flat plate-shaped integrally cast structure, the right bracket rear suspension and the left bracket rear suspension are symmetrical parts; the bracket assembly is a left bracket rear suspension, a right bracket rear suspension and a pocket beam welded integral structure, the left bracket rear suspension and the right bracket rear suspension are connected to the frame using two mounting surfaces, and the structure is designed according to the changes in the layout space; reasonable avoidance is performed in the structure, which overcomes the limited layout space and meets the requirements of modality and strength; the reliability of the system is guaranteed, and then the reliability of the entire vehicle is guaranteed; the bracket assembly integrates the third crossbeam of the frame, achieves the effects of physical structure integration and functional integration, and at the same time plays a role in lightweighting and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1-2 It is a schematic structural diagram of a hybrid vehicle rear suspension system of the present invention;

[0017] Figure 3 is a structural schematic diagram of the bracket assembly;

[0018] Figure 4-5 It is a structural schematic diagram of the rear suspension of the right bracket;

[0019] Figure 6-7 It is a structural schematic diagram of the rear suspension of the left bracket;

[0020] Figure 8-9 It is a structural schematic diagram of the rear suspension of the right bracket;

[0021] Fig.10 is a structural schematic diagram of a cushion assembly;

[0022] Fig.11 It is a structural schematic diagram of the cushion body;

[0023] Fig.12 This is a schematic diagram of the structure of Baogai;

[0024] Figure 13-14 is a structural schematic diagram of the bracket assembly;

[0025] Fig.15 It is a structural schematic diagram of the rear suspension of the left bracket;

[0026] Fig.16It is a connection diagram of the vehicle frame, bracket assembly, right bracket rear suspension and cushion assembly;

[0027] Fig.17 It is an assembly diagram of the frame, bracket assembly, right bracket rear suspension and cushion assembly. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1-17 As shown, a hybrid vehicle rear suspension system of the present invention includes a frame 1, a powertrain 2, a bracket assembly 3, a left bracket rear suspension 4, a right bracket rear suspension 5, and a cushion assembly 6. The bracket assembly 3 includes a left bracket rear suspension 31, a right bracket rear suspension 32 and a pocket beam 33. One end of the pocket beam 33 is fixedly connected to one side of the frame through the left bracket rear suspension 31, and the other end is fixedly connected to the other side of the frame through the right bracket rear suspension 32; one end of the left bracket rear suspension 4 is fixedly connected to the left bracket rear suspension 31 through the cushion assembly 6, and the other end is fixedly connected to one side of the powertrain 2; one end of the right bracket rear suspension 5 is fixedly connected to the right bracket rear suspension 32 through the cushion assembly 6, and the other end is fixedly connected to the other side of the powertrain 2.

[0030] In this embodiment, the power assembly 2 includes an engine assembly 21 and an electric drive assembly 22. The electric drive assembly 22 is connected to the engine assembly 21. The electric drive assembly 22 includes a transmission 221, a motor A222 and a motor B223. The motor A222 and the motor B223 are connected side by side to the transmission 221.

[0031] Combination Figure 3 , 13 14. In this embodiment, the bracket assembly 3 includes a left bracket rear suspension 31, a right bracket rear suspension 32 and a scoop beam 33, which are welded as a whole and mounted on the vehicle frame 1 by bolts. The fourth straight segment 334 of the scoop beam 33 penetrates into the side wall hole A315 of the left bracket rear suspension 31, and the two are welded together by double-sided welding; the seventh straight segment 337 of the scoop beam 33 penetrates into the side wall hole B326 of the right bracket rear suspension 32, and the two are welded together by double-sided welding.

[0032] The bracket assembly 3 supports the powertrain and also serves as a frame crossbeam. In other words, the bracket assembly 3 integrates the third crossbeam of the frame, achieving the effects of physical structure integration and functional integration, while also playing a role in light weight and reducing costs.

[0033] Combination Figure 13-14 The pocket beam 33 is formed by bending a metal profile round tube, and includes a first straight line segment 331, a second straight line segment 332, a third straight line segment 333, a fourth straight line segment 334, a fifth straight line segment 335, a sixth straight line segment 336 and a seventh straight line segment 337. The first straight line segment 331 is arranged in the middle, one end of which is connected to the second straight line segment 332, the third straight line segment 333 and the fourth straight line segment 334 in sequence, and the other end is connected to the fifth straight line segment 335, the sixth straight line segment 336 and the seventh straight line segment 337 in sequence. The straight segments are connected by arc segments, and each straight segment is made into an asymmetric structure, which is conducive to maintaining a reasonable gap value with other surrounding parts; the scoop beam 33 is low in the middle and high at both ends; the fourth straight segment 334 is at the highest point at one end of the scoop beam 33, and is fixedly connected to the left bracket rear suspension 31; the seventh straight segment 337 is at the highest point at the other end of the scoop beam 33, and is fixedly connected to the right bracket rear suspension 32; the first straight segment 331 is the lowest point in the middle of the scoop beam 33, and it presents a sinking shape in the Z direction of the vehicle, and its main function is to avoid the effect of the transmission shaft; the distances A, B, and C are the gap values ​​between the motion envelope circle of the scoop beam 33 and the transmission shaft, and it is generally recommended to be greater than 40 mm; the dimension D is the gap between the scoop beam 33 and the ground, and the dimension D should be greater than the minimum ground clearance of the vehicle.

[0034] Combination Figure 4-5 As shown, in this embodiment, the left bracket rear suspension 4 is installed on the power assembly 2, and the cushion assembly 6 is installed on the left bracket rear suspension 31 and connected to the left bracket rear suspension 31; the left bracket rear suspension 4 and the right bracket rear suspension 5 are symmetrical parts to each other, and the right bracket rear suspension 5 includes an electric drive assembly connecting plate 51, a transition plate 52, a cushion connecting plate 53, a first reinforcing rib 54 and a second reinforcing rib 55. The electric drive assembly connecting plate 51 and the cushion connecting plate 53 are both flat plate structures and are no longer in the same plane; the electric drive assembly connecting plate 51 is fixedly connected to the power assembly 2, and a second reinforcing rib 55 is provided on the lower surface of the electric drive assembly connecting plate 51; the cushion connecting plate 53 is fixedly connected to the cushion assembly 6, and a first reinforcing rib 54 is provided on the upper surface of the cushion connecting plate 53.

[0035] The electric drive assembly connecting plate 51 and the soft pad connecting plate 53 have a certain height difference and are not in the same plane, which is determined by the fact that the mating surface of the electric drive assembly end and the mating surface of the soft pad are not in the same plane; the soft pad connecting plate 52 plays a connecting role; the reinforcing ribs (54, 55) play a role in modal and strength reinforcement. According to CAE simulation and comparative analysis, the stress of low-speed collision conditions is reduced by 8MPa, the stress of impact conditions is reduced by 19Mpa, and the modal is increased by 2Hz. In addition, the notch 531 on the soft pad connecting plate 53 is designed to avoid the mounting bolts on the electric drive assembly, and the gap c is greater than 10mm. Because the minimum distance b between the electric drive assembly connecting plate 51 and the soft pad connecting plate 53 is about 23mm, and the angle a between the two planes is 3.5°, it is not easy to ensure the overall mechanical properties of the parts by using stamping and welding for the right bracket rear suspension 5, so the casting process is preferred for one-piece molding.

[0036] The CAE simulation calculation requirements of the right bracket rear suspension 5 are as follows: the first-order mode is greater than 600 Hz; the stress of the low-speed collision condition is less than the tensile stress of the material, and the stress of the impact condition is less than the yield stress of the material.

[0037] Combination Figure 6-7 As shown, in this embodiment, the left bracket rear suspension 31 is made of QT450 ductile iron material and is formed by an integrated casting process; the left bracket rear suspension 31 includes a left frame mounting plate A311, a left frame mounting plate B312 and a left cushion mounting plate 313; the left frame mounting plate A311 and the left frame mounting plate B312 are fixedly connected to the frame, and the left frame mounting plate A311 and the left frame mounting plate B312 are both provided with bosses that contact and cooperate with the frame; the left cushion mounting plate 313 is provided with a tapered hole 3131 and a guide hole 3132 for installing the cushion assembly 6, and the side wall of the left cushion mounting plate 313 is provided with a left pocket beam mounting hole. The left cushion mounting plate 313 is provided with a boss, a tapered hole, and a guide hole; the side wall A314 and the side wall B315 are respectively provided with through holes (3141, 3151) of the pocket beam 33, which also play a role in structural reinforcement.

[0038] Two symmetrical bosses 3111 are arranged on the left frame mounting plate A311, which are contact surfaces with the frame 1, and can reduce the processing area, improve the processing accuracy and reduce the cost; the left frame mounting plate B312 also has bosses (3121, 3122), and the function of the boss 3121 is also the contact surface with the frame, and can reduce the processing area, improve the accuracy and reduce the cost; the function of the boss 3122 is the contact surface with the bolt, which reduces the processing area, improves the accuracy and reduces the cost; the boss 3122 is designed as a heightened structure, which has the function of strengthening the strength and the modality. According to CAE simulation and comparative analysis, the stress of the low-speed collision condition is reduced by 14MPa, the stress of the impact condition is reduced by 28Mpa, and the modality is increased by 4Hz; a part of the arc area of ​​the boss 3122 is shared with the side walls (314, 315), which can not only increase the pressing area of ​​the bolt but also reduce the size of the entire part.

[0039] The function of the tapered hole 3131 provided on the left cushion mounting plate 313 is to install and position the cushion assembly 6, and the function of the guide hole 3132 is to reduce the difficulty of centering the cone 6221 of the cushion assembly 6 and the tapered hole 3132 when the power assembly 2 is installed, and to play a guiding role, so that the cushion assembly 6 can easily slide from the guide hole 3132 to the tapered hole 3131, thereby facilitating the installation of the power assembly 2.

[0040] The CAE simulation calculation requirements of the left bracket rear suspension 31 are: 1 state is greater than 400Hz, the stress of the low-speed collision condition is less than the tensile stress of the material, and the stress of the impact condition is less than the yield stress of the material.

[0041] Combination Figure 8-9 As shown, the right bracket rear suspension 32 is formed by an integrated casting process and is made of QT450 ductile iron material; the right bracket rear suspension 32 includes a right frame mounting plate A321, a right frame mounting plate B322, a connecting plate 323 and a right cushion mounting plate 324; the right frame mounting plate A321 and the right frame mounting plate B322 are fixedly connected to the frame, and the right frame mounting plate A321 and the right frame mounting plate B322 are both provided with bosses that contact and cooperate with the frame; the right cushion mounting plate 324 is provided with a tapered hole 3231 and a guide hole 3232 for installing the cushion assembly 6, and the side wall of the right cushion mounting plate 324 is provided with a right pocket beam mounting hole. The right cushion mounting plate 324 is provided with a boss, a tapered hole, and a guide hole; the side wall 325 and the side wall 326 are respectively provided with pocket beam through holes (3251, 3261), which also play a role in strengthening the structure.

[0042] Two symmetrical bosses 3211 are arranged on the right frame mounting plate A321, which are the contact surfaces with the frame and the bolts respectively. The boss 3211 can reduce the processing area, improve the precision and reduce the cost; the right frame mounting plate B322 also has bosses (3221, 3222), and the function of the boss 3221 is also the contact surface with the frame. The boss 3221 reduces the processing area, improves the precision and reduces the cost; the function of the boss 3222 is the contact surface with the bolts. The boss 3222 reduces the processing area, improves the precision and reduces the cost. It is designed as a heightened structure, which has the function of strengthening the strength and the modality. According to CAE simulation and comparative analysis, the stress of the low-speed collision condition is reduced by 12MPa, the stress of the impact condition is reduced by 25Mpa, and the modality is increased by 3Hz.

[0043] The right cushion mounting plate 324 is provided with a cutout 3241 to increase the gap with the exhaust pipe. The cone hole 3241 provided on the right cushion mounting plate 324 is used to install and position the cushion assembly 6, and the guide hole 3242 is used to reduce the difficulty of centering the cone 6221 of the cushion assembly 6 and the cone hole 3241 when the power assembly 2 is installed, and plays a guiding role, so that the cushion assembly 6 can easily slide from the guide hole 3242 to the cone hole 3231, thereby facilitating the installation of the power assembly 2.

[0044] The CAE simulation calculation requirements of the right bracket rear suspension 32 are: the first-order mode is greater than 400 Hz, the stress of the low-speed collision condition is less than the tensile stress of the material, and the stress of the impact condition is less than the yield stress of the material.

[0045] Combination Figure 10-12 As shown, the cushion assembly 6 includes a cover 61 and a cushion body 62 disposed in the cover 61, and the cushion body 62 includes an upper cover 621, a lower cover 622 and a rubber cushion 623; a rubber cushion 623 is disposed between the upper cover 621 and the lower cover 622, and the rubber cushion 623 is connected together by a vulcanization process; a welding stud 6211 is disposed on the upper cover 621 for connecting with the left bracket rear suspension 4; a frustum 6221 is disposed on the lower cover 623 for connecting with the left bracket rear suspension 31. An arrow mark is disposed on the rubber cushion 623 to indicate the installation direction of the cushion assembly 6. The cover 61 is a concave structure, consisting of a mounting plate 611 and a side wall 612. The mounting plate 611 is provided with two through holes 6111, and a notch 6121 is provided on the side wall 612 to ensure that the gap with the right bracket-rear suspension 32 is ≥10mm. The function of the side wall 612 is to limit the vibration of the rear suspension system in the X and Y directions, and the function of the mounting plate 611 is to limit the Z direction.

[0046] A buffer rubber block 6221 is vulcanized on the flange 6222 of the lower cover 622. The buffer rubber block 6221 plays a role in buffering impact, and the flange 6222 plays a role in Y-axis limiting. The purpose of the limiting is to make the vibration of the powertrain (electric drive assembly) within a certain range to ensure the stability of the system.

[0047] The installation method of the hybrid vehicle rear suspension system of the present invention on the whole vehicle is as follows: firstly, the power assembly 2 is sub-assembled, the left bracket rear suspension 4 is installed on the left side of the power assembly 2, and then the cushion assembly 6 is installed on the left bracket rear suspension 4; similarly, the right bracket rear suspension 5 is installed on the right side of the power assembly 2, and then the cushion assembly 6 is installed on the right bracket rear suspension 5; the left bracket rear suspension 31 is installed on the left longitudinal beam with bolts, and the right bracket rear suspension 32 is installed on the right longitudinal beam with bolts; finally, the sub-assembled power assembly 2 is dropped onto the left bracket assembly 3.

[0048] like Fig.17As shown in the figure, when designing the model of the rear mount system of the hybrid vehicle of the present invention, the process assembly simulation check and analysis of the rear mount system is carried out by means of simulation assembly. Taking the assembly of the bracket assembly 3 as an example. Due to the limitation of the space structure, the axes of the mounting nut 04 and the bolt 03 of the right bracket rear mount 32 are relatively close to the right welding section of the cradle beam 33, and the axis of the mounting bolt 3 of the cushion assembly 6 is relatively close to the right welding section of the cradle beam 33. Enough space should be reserved for placing the first sleeve 01 and the second sleeve 02 during design to facilitate the operation of the air gun; the method is to assemble the first sleeve 01 and the second sleeve 02 onto the model according to the model with the same size as the actual sleeve, and check the clearance e between the first sleeve 01, the second sleeve 02 and the straight section 337 of the cradle beam 33, and the clearance e is required to be ≥5mm.

[0049] The rear mount system of the hybrid vehicle of the present invention achieves the following objectives by means of energy decoupling, arranged in descending order of priority as follows:

[0050] a) 7Hz < Rx frequency < 13Hz, the lower the Rx frequency, the better, it is recommended to be 8Hz;

[0051] b) 8Hz < Tz frequency < 11Hz; it is recommended that 8Hz < Tz frequency < 9Hz;

[0052] c) 5.5Hz < other degree-of-freedom frequencies < 17.7Hz; it is recommended that 6Hz < other degree-of-freedom frequencies < 16Hz;

[0053] d) The frequency intervals of each are > 1Hz, the minimum interval > 0.5Hz, and at least the frequency intervals between Rx and Tz, Rx and Ty, Ry and Tz are > 1Hz;

[0054] e) The Tz and Rx frequencies avoid the 1st order 12.5Hz and 0.5th order 6.25Hz of the idle speed and the 1st order frequency of the air compressor;

[0055] f) The decoupling rates of Tz and Rx are ≥ 85%, and the requirements can be appropriately relaxed, ≥ 75%;

[0056] g) The decoupling rates of Tx and Ry are ≥ 75%, and the requirements can be appropriately relaxed, ≥ 65%;

[0057] h) The decoupling rates of Ty and Rz are ≥ 60%, and the requirements can be appropriately relaxed, ≥ 50%;

[0058] The above: Tz represents the movement of the power assembly in the Z direction, Rx represents the rotation of the power assembly around the X axis; Tx represents the movement of the power assembly in the X direction, Ry represents the rotation of the power assembly around the Y axis; Ty represents the movement of the power assembly in the Y axis, and Rz represents the rotation of the power assembly around the Z axis.

[0059] According to the above solution results, the coordinates of the elastic centers of the left and right suspensions of the rear suspension system and the arrangement angles are selected to carry out structural design; the technical principle is that the powertrain is installed on the vehicle frame through a four-point suspension, wherein the front suspension system is installed at two points and the rear suspension system is installed at two points. The present invention describes the rear suspension system.

[0060] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0061] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A hybrid vehicle rear suspension system, characterized in that: It includes a frame, a powertrain, a bracket assembly, a left bracket rear suspension, a right bracket rear suspension, and a cushion assembly. The bracket assembly includes a left bracket rear suspension, a right bracket rear suspension, and a pocket beam. One end of the pocket beam is fixedly connected to one side of the frame through the left bracket rear suspension, and the other end is fixedly connected to the other side of the frame through the right bracket rear suspension; one end of the left bracket rear suspension is fixedly connected to the cushion assembly and the left bracket rear suspension, and the other end is fixedly connected to one side of the powertrain; one end of the right bracket rear suspension is fixedly connected to the right bracket rear suspension through the cushion assembly, and the other end is fixedly connected to the other side of the powertrain.

2. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The pocket beam includes a first straight line segment, a second straight line segment, a third straight line segment, a fourth straight line segment, a fifth straight line segment, a sixth straight line segment and a seventh straight line segment. The first straight line segment is arranged in the middle, one end of which is connected to the second straight line segment, the third straight line segment and the fourth straight line segment in sequence, and the other end of which is connected to the fifth straight line segment, the sixth straight line segment and the seventh straight line segment in sequence.

3. The hybrid vehicle rear suspension system according to claim 2, characterized in that: The pocket beam is low in the middle and high at both ends; the fourth straight line segment is located at the highest point at one end of the pocket beam and is fixedly connected to the left bracket rear suspension; the seventh straight line segment is located at the highest point at the other end of the pocket beam and is fixedly connected to the right bracket rear suspension; the first straight line segment is the lowest point in the middle of the pocket beam, and the gap with the ground is greater than the minimum ground clearance of the vehicle.

4. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The clearance value between the motion envelope circle of the pocket beam and the transmission shaft is greater than 40 mm.

5. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The power assembly includes an engine assembly and an electric drive assembly. The electric drive assembly is connected to the engine assembly. The electric drive assembly includes a transmission, a motor A and a motor B. The motor A and the motor B are connected to the transmission 221 in parallel.

6. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The left bracket rear suspension and the right bracket rear suspension are symmetrical parts. The right bracket rear suspension includes an electric drive assembly connecting plate, a transition plate, a cushion connecting plate, a first reinforcement rib and a second reinforcement rib. The electric drive assembly connecting plate and the cushion connecting plate are both flat plate structures and are no longer in the same plane; the electric drive assembly connecting plate is fixedly connected to the power assembly, and a second reinforcement rib is provided on the lower surface of the electric drive assembly connecting plate; the cushion connecting plate is fixedly connected to the cushion assembly, and a first reinforcement rib is provided on the upper surface of the cushion connecting plate.

7. The hybrid vehicle rear suspension system according to claim 6, characterized in that: The minimum distance between the electric drive assembly connecting plate and the cushion connecting plate is 23 mm, and the angle between the two planes is 3.5°.

8. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The left bracket rear suspension is made of QT450 ductile iron material and is formed by an integrated casting process; it includes a left frame mounting plate A, a left frame mounting plate B and a left cushion mounting plate; the left frame mounting plate A and the left frame mounting plate B are fixedly connected to the frame, and both the left frame mounting plate A and the left frame mounting plate B are provided with bosses that contact and cooperate with the frame; the left cushion mounting plate is provided with a tapered hole and a guide hole for installing the cushion assembly, and the side wall of the left cushion mounting plate is provided with a left pocket beam mounting hole.

9. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The right bracket rear suspension is formed by an integrated casting process and uses QT450 ductile iron material; the right bracket rear suspension includes a right frame mounting plate A, a right frame mounting plate B, a connecting plate and a right cushion mounting plate; the right frame mounting plate A and the right frame mounting plate B are fixedly connected to the frame, and the right frame mounting plate A and the right frame mounting plate B are both provided with bosses that contact and cooperate with the frame; the right cushion mounting plate is provided with a tapered hole and a guide hole for installing the cushion assembly, and the side wall of the right cushion mounting plate is provided with a right pocket beam mounting hole.

10. The hybrid vehicle rear suspension system according to claim 1, characterized in that: The cushion assembly includes a cover and a cushion body arranged in the cover, and the cushion body includes an upper cover, a lower cover and a rubber cushion; a rubber cushion is provided between the upper cover and the lower cover, which are connected together through a vulcanization process; a welding stud is provided on the upper cover for connecting with the rear suspension of the left bracket; the lower cover is provided with a frustum for connecting with the rear suspension of the left bracket; an arrow mark is provided on the rubber cushion to indicate the installation direction of the cushion assembly; a buffer rubber block is vulcanized on the flange of the lower cover.

Images