Suspension bushing, motor suspension and vehicle

Abstract

The utility model discloses a suspension lining, a motor suspension and a vehicle. The suspension lining comprises an inner core, an outer pipe, a main spring and a plurality of mass blocks. The outer pipe is sleeved outside the inner core; the main spring is arranged between the inner core and the outer pipe, and the inner core and the outer pipe are integrally arranged through the main spring; the mass blocks are arranged on the two opposite sides of the main spring in a protruding mode in the axial direction, and the heights of the mass blocks in the axial direction are different in the circumferential direction of the lining. Through the scheme, the dynamic stiffness of the suspension bushing can be reduced, and the noise of the motor is optimized.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a suspension bushing, a motor mount, and a vehicle. Background Technology

[0002] With the increasing use of electric vehicles and users' growing demand for vehicle performance, coupled with the low background noise of electric vehicles and the absence of engine noise masking the noise, the whine of the electric motor has become increasingly prominent. Under different operating conditions (such as full-throttle acceleration, coasting, and constant speed), the high-frequency noise of the drive motor is transmitted to the interior of the vehicle through the motor mounts, subframe, and can be clearly perceived by passengers.

[0003] As one of the important pathways for the transmission of motor vibration and noise, proper motor mounting design plays a crucial role in improving motor whistling. Utility Model Content

[0004] The main technical problem this application addresses is to provide a suspension bushing, a motor mount, and a vehicle that can reduce the dynamic stiffness of the suspension bushing and optimize motor noise.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a suspension bushing, including an inner core, an outer tube, a main spring and a plurality of mass blocks; the outer tube is sleeved outside the inner core; the main spring is disposed between the inner core and the outer tube, and the inner core and the outer tube are integrally disposed through the main spring; the plurality of mass blocks are axially protruding on opposite sides of the main spring, and along the circumference of the bushing, the heights of the plurality of mass blocks in the axial direction are all different.

[0006] Preferably, the number of mass blocks is four, including a first mass block, a second mass block, a third mass block, and a fourth mass block. The first mass block, the second mass block, the third mass block, and the fourth mass block are distributed sequentially in a clockwise or counterclockwise direction, and their heights increase sequentially in the axial direction.

[0007] Preferably, the height difference between the first mass block and the second mass block, the second mass block and the third mass block, and the third mass block and the fourth mass block are all the same.

[0008] Preferably, a through hole is formed between the main spring and the outer tube, extending axially through the suspension bushing; the suspension bushing further includes a mass protrusion, one end of which is connected to the side wall of the through hole near the main spring, and the other end of which extends toward the outer tube and is spaced apart from the outer tube.

[0009] Preferably, the mass protrusion includes a connector and a protrusion, the two ends of the connector are respectively connected to the sidewall of the through hole and the protrusion, and the two ends of the protrusion protrude from the connector along the axial direction.

[0010] Preferably, the two through holes are symmetrically arranged along the first direction, and each through hole is provided with two mass protrusions. The two mass protrusions are symmetrically arranged along the second direction, which is perpendicular to the first direction. Both the second direction and the first direction are perpendicular to the axial direction.

[0011] Preferably, the extension direction of the mass block is parallel to the extension direction of the mass protrusion.

[0012] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a motor mount, including a mount bushing and a mount bracket as described in any embodiment, wherein the mount bracket has a mounting hole and the mount bushing is press-fitted into the mounting hole.

[0013] Preferably, the suspension bracket is a sheet metal bracket.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a vehicle including the motor mount described in any embodiment.

[0015] The beneficial effects of this application are as follows: Unlike the prior art, this application provides protruding mass blocks on the suspension bushing in the thickness direction, and the height of the multiple mass blocks in the thickness direction is not consistent, so that the multiple mass blocks are distributed asymmetrically on the suspension bushing. The above distribution can reduce the dynamic stiffness of the suspension bushing in the high-frequency range in the axial, first and second directions, especially the dynamic stiffness in the axial direction. At the same time, it adjusts the natural frequency of the suspension bushing, improves the vibration isolation performance of the motor suspension, and reduces motor noise. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one embodiment of the suspension bushing of this application;

[0017] Figure 2 This is a side view of one embodiment of the suspension bushing of this application;

[0018] Figures 3a-3c This refers to the dynamic stiffness of the suspension bushing in three directions of this application;

[0019] Figure 4 This is a schematic diagram of one embodiment of the motor suspension of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the following detailed description is provided with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] See Figure 1 and Figure 2 , Figure 1 This is a structural schematic diagram of one embodiment of the suspension bushing of this application. Figure 2 This is a side view of one embodiment of the suspension bushing of this application. The suspension bushing 1 includes an inner core 11, an outer tube 12, a main spring 13, and multiple mass blocks 14. Specifically, the axial direction of the suspension bushing 1 is the Y-direction in the figure, and the suspension bushing 1 extends in the plane containing the first direction Z and the second direction X, where the first direction Z is the up-down direction in the figure, and the second direction X is the left-right direction in the figure. The inner core 11 is a circular tube, and the outer tube 12 is sleeved outside the inner core 11. Specifically, the outer tube 12 and the inner core 11 are coaxially arranged. The outer tube 12 is made of plastic, and the inner core 11 is made of alloy. The main spring 13 is disposed between the inner core 11 and the outer tube 12, and the inner core 11 and the outer tube 12 are integrally formed by the main spring 13. Specifically, the main spring 13 is made of rubber, and the inner side of the main spring 13 is vulcanized integrally with the inner core 11, and the outer side of the main spring 13 is vulcanized integrally with the outer tube 12. Multiple mass blocks 14 are axially protruding on opposite sides of the main spring 13, and along the circumference of the suspension bushing 1, the heights of the multiple mass blocks 14 in the axial direction (i.e., the thickness direction) are all different. Specifically, the multiple mass blocks 14 are completely symmetrical in the thickness direction, that is, the orthographic projections of the two sets of mass blocks 14 located on the front and back sides of the main spring 13 completely overlap in the thickness direction, and the two overlapping sets of mass blocks 14 are also completely identical in height. The material of the mass blocks 14 is rubber, the same material as the main spring 13.

[0022] This application provides a mass block 14 protruding in the thickness direction on the suspension bushing 1, and the height of the multiple mass blocks 14 protruding in the thickness direction is not the same, so that the multiple mass blocks 14 present an asymmetrical distribution on the suspension bushing 1. The above distribution can reduce the dynamic stiffness of the suspension bushing 1 in the axial direction, the first direction Z and the second direction X in the high frequency range (e.g., 600Hz-800Hz), especially the dynamic stiffness in the axial direction. At the same time, it adjusts the natural frequency of the suspension bushing 1, improves the vibration isolation performance of the motor suspension, and improves the motor noise.

[0023] Optionally, continue reading Figure 1The main spring 13 includes four radially arranged sub-sections 131. The main spring 13 is generally X-shaped. There are four mass blocks 14, each disposed on one of the four sub-sections 131. The four mass blocks 14 are a first mass block 141, a second mass block 142, a third mass block 143, and a fourth mass block 144. These mass blocks are distributed sequentially in a clockwise or counterclockwise direction, with their axial height increasing sequentially. Preferably, the first mass block 141 can be disposed on the upper left sub-section 131, the second mass block 142 on the upper right sub-section 131, the third mass block 143 on the lower right sub-section 131, and the fourth mass block 144 on the lower left sub-section 131. In other embodiments, the four mass blocks 14 can also be flipped left and right with the first center line C1 in the vertical direction as the axis. That is, the dynamic stiffness can also be reduced by flipping the suspension bushing 1 left and right with the first center line C1 as the axis.

[0024] Specifically, the orthographic projection of the four mass blocks 14 onto the main spring 13 is a rectangle. The length direction of this rectangle can be perpendicular to the extension direction of the sub-part 131 to reduce the dynamic stiffness in the first direction Z and the second direction X, thereby improving the vibration isolation performance of the motor mount. The material of the mass blocks 14 can be the same as that of the main spring 13, and the two can be formed simultaneously.

[0025] Optionally, continue reading Figure 1 and combined Figure 2 The height differences between the first mass block 141 and the second mass block 142, the second mass block 142 and the third mass block 143, and the third mass block 143 and the fourth mass block 144 are all the same. In this embodiment, the heights of the four mass blocks 14 increase progressively in a clockwise direction, and the height difference between any two adjacent mass blocks 14 (except for the first mass block 141 and the fourth mass block 144) remains constant. Specifically, in this embodiment, the height of the first mass block 141 is 6mm, the height of the second mass block 142 is 7mm, the height of the third mass block 143 is 8mm, the height of the fourth mass block 144 is 8mm, and the height difference between any two adjacent mass blocks 14 is 1mm. It should be noted that the axial end face of the mass block 14 should not exceed the circumferential end face of the inner core 11 to avoid interference with other components.

[0026] Optionally, a through hole 15 is formed between the main spring 13 and the outer tube 12, extending axially through the suspension bushing 1. Specifically, in this embodiment, four through holes 15 are provided. Two first through holes 151 are distributed along the first direction Z and are symmetrically arranged about the second center line C2 in the horizontal direction. Two second through holes 152 are distributed along the second direction X and are symmetrically arranged about the first center line C1. All four through holes 15 are arc-shaped and protrude towards the inner core 11. The suspension bushing 1 also includes a mass protrusion 16. One end of the mass protrusion 16 is connected to the side wall of the through hole 15 near the main spring 13, and the other end of the mass protrusion 16 extends towards the outer tube 12 and is spaced apart from the outer tube 12. Specifically, in this embodiment, four mass protrusions 16 are provided, all disposed in the second through holes 152. Two mass protrusions 16 are provided in each second through hole 152, and the two mass protrusions 16 are respectively disposed at the ends of the second through holes 152. The ends of the second through holes 152 have a large installation space, which can extend the protruding length of the mass protrusions 16 as much as possible, ensuring a significant reduction in dynamic stiffness. It should be noted that the free ends of the mass protrusions 16 should be spaced apart from the inner wall of the second through holes 152 to avoid interference between the second through holes 152 and the mass protrusions 16 during vibration, so as to avoid wear or even detachment of the mass protrusions 16. The mass protrusions 16 in each second through hole 152 are symmetrically arranged about the second direction X, and the four mass protrusions 16 are symmetrically arranged in pairs about the first direction Z. This application further reduces the dynamic stiffness of the suspension bushing 1 in the axial direction, the first direction Z, and the second direction X in the high-frequency range by setting the mass protrusions 16, thereby improving the vibration isolation performance of the motor suspension. The mass protrusion 16 can be made of the same material as the main spring 13, and the two can be formed simultaneously. In other embodiments, the mass protrusion 16 can also be provided only in the first through hole 151, or simultaneously in the first through hole 151 and the second through hole 152.

[0027] Optionally, the mass protrusion 16 includes a connector 161 and a protrusion 162. The two ends of the connector 161 are connected to the sidewall of the through hole 15 and the protrusion 162, respectively. The two ends of the protrusion 162 protrude axially from the connector 161. In this embodiment, the connector 161 extends in the plane of the main spring 13, extends along the second direction X and offsets along the first direction Z. The extension direction of the connector 161 is parallel to the length direction of the mass block 14. The connector 161 mainly reduces the dynamic stiffness of the suspension bushing 1 in the second direction X. The protrusion 162 protrudes axially from the connector 161, which can further reduce the dynamic stiffness of the suspension bushing 1 in the axial direction. It should be noted that the two ends of the protrusion 162 in the axial direction should not exceed the end face of the main spring 13 in the axial direction to avoid interference with other components. Furthermore, the protrusion 162 can also protrude from the connector 161 in a direction perpendicular to the extension direction of the connector 161, which can further reduce the dynamic stiffness of the suspension bushing 1 in the first direction Z.

[0028] See Figures 3a-3c , Figure 3a This refers to the dynamic stiffness of the suspension bushing in the first direction. Figure 3b This refers to the dynamic stiffness of the suspension bushing in the second direction of this application. Figure 3c This refers to the axial dynamic stiffness of the suspension bushing of this application. The three figures above compare the dynamic stiffness curves of the suspension bushing in three states: without a mass block and with a mass protrusion (shown in R02), with only a mass block (shown in R04), and with both a mass block and a mass protrusion (shown in R05). It can be seen from the figures that both the mass block and the mass protrusion can reduce the peak value of the dynamic stiffness in the high-frequency range, with the reduction in dynamic stiffness in the second direction X and the axial direction being more significant.

[0029] See Figure 4 , Figure 4 This is a structural schematic diagram of one embodiment of the motor mount of this application. An embodiment of this application also provides a motor mount 10, including a mount bushing 1 and a mount bracket 2 as described in any of the above embodiments. The mount bracket 2 has a mounting hole 21, and the mount bushing 1 is press-fitted into the mounting hole 21. Optionally, the mount bracket 2 is a sheet metal bracket. The material of the mount bracket 2 can specifically be structural steel. Compared to cast aluminum, optimizing the natural frequency of the mount bracket 2 and the dynamic stiffness of the mounting point avoids the main excitation frequency range of the electric drive, improves the vibration quality of the motor mount 10, suppresses vibration, thereby improving the high-frequency whine of the motor, reducing the amount of motor noise transmitted to the vehicle body, improving the overall NVH performance of the vehicle, and also reducing costs.

[0030] Embodiments of this application also provide a vehicle including a motor mount according to any of the embodiments. The vehicles described in this application include various electric vehicles with electric drive structures.

[0031] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A suspension bushing, characterized in that, include: Inner core; The outer tube is fitted over the inner core; A main spring is disposed between the inner core and the outer tube, and the inner core and the outer tube are integrally formed by the main spring; Multiple mass blocks are axially protruding on opposite sides of the main spring, and the heights of the multiple mass blocks in the axial direction are all different along the circumference of the bushing.

2. The suspension bushing according to claim 1, characterized in that, The number of mass blocks is four, including a first mass block, a second mass block, a third mass block, and a fourth mass block. The first mass block, the second mass block, the third mass block, and the fourth mass block are distributed sequentially in a clockwise or counterclockwise direction, and their heights increase sequentially in the axial direction.

3. The suspension bushing according to claim 2, characterized in that, The height difference between the first mass block and the second mass block, the second mass block and the third mass block, and the third mass block and the fourth mass block is the same.

4. The suspension bushing according to claim 1, 2, or 3, characterized in that, A through hole is formed between the main spring and the outer tube, extending axially through the suspension bushing; The suspension bushing also includes a mass protrusion, one end of which is connected to the side wall of the through hole near the main spring, and the other end of which extends toward the outer tube and is spaced apart from the outer tube.

5. The suspension bushing according to claim 4, characterized in that, The mass protrusion includes a connector and a protrusion. The two ends of the connector are respectively connected to the sidewall of the through hole and the protrusion. The two ends of the protrusion protrude from the connector along the axial direction.

6. The suspension bushing according to claim 4, characterized in that, The two through holes are symmetrically arranged along a first direction, and each through hole is provided with two mass protrusions. The two mass protrusions are symmetrically arranged along a second direction, which is perpendicular to the first direction. Both the second direction and the first direction are perpendicular to the axial direction.

7. The suspension bushing according to claim 4, characterized in that, The extension direction of the mass block is parallel to the extension direction of the mass protrusion.

8. A motor mounting bracket, characterized in that, include: Suspension bushing as described in any one of claims 1-7, The suspension bracket has mounting holes, and the suspension bushing is press-fitted into the mounting holes.

9. The motor mount according to claim 8, characterized in that, The suspension bracket is a sheet metal bracket.

10. A vehicle, characterized in that, include: The motor mount as described in claim 8 or 9.

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