A left suspension active side secondary vibration isolation structure

Abstract

This utility model discloses a two-stage vibration isolation structure for the active side of a left-side suspension, relating to the field of automotive motor suspension vibration isolation. It includes an active-side bracket, a passive-side bracket, a main spring, and a bushing. The inner frame of the main spring is vulcanized and fixed to the active-side bracket, and the outer frame of the main spring is vulcanized and fixed to the passive-side bracket, forming the first stage of vibration isolation. A mounting hole is provided on one side of the active-side bracket, and the bushing is placed within the mounting hole, forming the second stage of vibration isolation. This structure establishes the first-stage vibration isolation path through "active-side bracket - main spring - passive-side bracket," and then utilizes "active-side bracket mounting hole - bushing - motor" to form the second-stage vibration isolation path. This attenuates the vibration generated by the motor through two consecutive stages: the first stage uses the main spring for basic isolation in the conventional frequency band, and the second stage uses the bushing to further reduce dynamic stiffness and dissipate energy in the high-frequency region. Thus, with fewer parts and a smaller size, it simultaneously achieves low-frequency steady-state support and high-frequency noise suppression, significantly improving in-vehicle acoustic and vibration comfort.

Description

Technical Field

[0001] This utility model relates to the field of vibration isolation technology for automotive motor mounts, specifically to a two-stage vibration isolation structure for the active side of the left mount. Background Technology

[0002] For hybrid vehicles, during operation, due to the unavoidable gaps between gears, when the motor rotates at high speed, the gas flows rapidly through the gaps, which produces cavitation noise, i.e., motor whistling.

[0003] Motor noise can be transmitted through two pathways: airborne and structural. For airborne transmission, adding sound-insulating parts can reduce the noise's transmission through the air. For structural transmission, suspension devices are needed to block the noise and reduce its transmission.

[0004] Traditional single-stage vibration isolation suspensions have limited ability to block the structural transmission of motor noise and cannot effectively block it. Therefore, there is an urgent need to propose a two-stage vibration isolation structure on the active side of the left suspension. Utility Model Content

[0005] In order to overcome the above-mentioned technical problems, the purpose of this utility model is to provide a two-stage vibration isolation structure for the left-mounted active side.

[0006] The objective of this utility model can be achieved through the following technical solutions: A left-mounted active-side two-stage vibration isolation structure for mounting on a motor includes an active-side bracket, a passive-side bracket, a main spring, and a bushing; the inner frame of the main spring is vulcanized and fixed to the active-side bracket, and the outer frame of the main spring is vulcanized and fixed to the passive-side bracket; a mounting hole is provided on one side of the active-side bracket, and the bushing is disposed in the mounting hole; The bushing includes an inner core, a vulcanized elastomer covering the outer surface of the inner core, and an outer tube sleeved on the outer surface of the elastomer. The inner core has a through hole, through which the motor fixing bolts of the motor are used to connect to the active side bracket.

[0007] As a further embodiment of this utility model: the inner core has a limiting plate extending radially along its axial side.

[0008] As a further embodiment of this utility model: the limiting plate is annular, and the longest outer diameter of the limiting plate is greater than the inner diameter of the mounting hole.

[0009] As a further embodiment of this utility model: the elastic body has a protrusion extending radially on its axial side, and the protrusion contacts the inner side of the limiting plate.

[0010] As a further embodiment of this utility model: the raised outer ring is provided with a first groove.

[0011] As a further embodiment of this utility model: the outer tube has a flange extending radially on its circumferential side, the flange being used to prevent the elastomer from rubbing against adjacent components.

[0012] As a further aspect of this invention: the flange contacts the surface of the active side bracket to limit the axial displacement of the bushing.

[0013] As a further embodiment of this utility model: a radial gap is provided in the middle position of the bushing, and the radial gap divides the elastomer into an upper elastic part and a lower elastic part along the axial direction to form an independent vibration isolation path of upper and lower halves.

[0014] As a further embodiment of this utility model, a second groove is provided on the opposite sides of the upper elastic part and the lower elastic part.

[0015] As a further embodiment of this utility model: the outer surface of the elastomer and the inner wall of the outer tube are tightly fitted together after press fitting to form an interference fit, and the mounting hole of the outer tube and the active side bracket are also interference fits.

[0016] The beneficial effects of this utility model are: The left-mounted active-side two-stage vibration isolation structure can be connected to the motor via the inner core of the bushing for mounting. Specifically, the motor mounting bolts can pass through the through-holes in the inner core and connect to the active-side bracket. The vibration transmission path of this structure is divided into two stages: the first stage of vibration is transmitted from the motor to the active-side bracket, then to the main spring, and finally to the passive-side bracket; the second stage of vibration is transmitted from the motor to the mounting bolts, then to the inner core of the bushing, then to the elastic body, then to the outer tube, and finally to the active-side bracket. The main spring primarily absorbs and isolates vibration through the elastic deformation of its elastic body. The elastic body within the bushing dissipates vibration energy through microscopic shear and compression deformation after being subjected to vibration from the inner core. This structure forms the first-level vibration isolation path through "active side bracket - main spring - passive side bracket", and then forms the second-level vibration isolation path through "active side bracket mounting hole - bushing - motor". The vibration generated by the motor is attenuated twice: the first level is basic isolation in the normal frequency band by the main spring, and the second level is further reduced dynamic stiffness and energy dissipation in the high frequency range by the bushing. After the two paths are connected in series, the entire suspension system provides "two-stage" resistance to the motor noise transmitted by the structure, so that the vibration cannot be directly transmitted to the vehicle body. Thus, with fewer parts and smaller size, it can simultaneously achieve low-frequency steady-state support and high-frequency noise suppression, significantly improving the sound and vibration comfort inside the vehicle. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the bushing structure according to an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the bushing according to an embodiment of the present utility model; Figure 4 This is a cross-sectional view of the bushing and active side support of an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Active side bracket; 2. Passive side bracket; 3. Main spring; 4. Mounting hole; 5. Bushing; 51. Inner core; 52. Elastomer; 53. Outer tube; 511. Through hole; 512. Limiting plate; 521. Protrusion; 522. First groove; 531. Flanged edge; 6. Radial clearance; 523. Upper elastic part; 524. Lower elastic part; 525. Second groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] See Figures 1-3 An embodiment of the present invention provides a left-suspension active-side two-stage vibration isolation structure for mounting on a motor, comprising an active-side bracket 1, a passive-side bracket 2, a main spring 3, and a bushing 5; the inner frame of the main spring 3 is vulcanized and fixed to the active-side bracket 1, and the outer frame of the main spring 3 is vulcanized and fixed to the passive-side bracket 2, forming a first-stage vibration isolation; a mounting hole 4 is provided on one side of the active-side bracket 1, and the bushing 5 is disposed in the mounting hole 4, forming a second-stage vibration isolation; the bushing 5 includes an inner core 51, an elastomer 52 vulcanized and covering the inner core 51, and an outer tube 53 sleeved on the elastomer 52; the elastomer 52 can be made of rubber material commonly used in the art, and the outer tube 53 can prevent the elastomer 52 from rubbing against the bracket housing to generate noise and improve the pull-out force; a through hole 511 is provided on the inner core 51, and the motor fixing bolt of the motor is used to pass through the through hole 511 to connect with the active-side bracket 1.

[0022] The left-suspension active-side secondary vibration isolation structure can be connected to the motor via the inner core 51 of the bushing 5 for mounting on the motor. Specifically, the motor fixing bolts can pass through the through hole 511 of the inner core 51 and then connect to the active-side bracket 1. The vibration transmission path of this structure is divided into two stages: the first stage vibration is transmitted from the motor to the active-side bracket 1, then to the main spring 3, and finally to the passive-side bracket 2; the second stage vibration is transmitted from the motor to the fixing bolts, through the through hole 511, to the inner core 51, then to the elastic body 52, then to the outer tube 53, and finally to the active-side bracket 1. The main spring 3 primarily absorbs and isolates vibration through the elastic deformation of its elastic body 52. ​​The elastic body 52 within the bushing 5 undergoes microscopic shearing and compression deformation after being subjected to vibration from the inner core 51, thus consuming vibration energy.

[0023] Furthermore, this structure forms the first-level vibration isolation path through "active side bracket 1 - main spring 3 - passive side bracket 2", and then uses "active side bracket 1 mounting hole 4 - bushing 5 - motor" to form the second-level vibration isolation path, which continuously attenuates the vibration generated by the motor through two stages: the first stage is basically isolated by the main spring 3 in the normal frequency band, and the second stage is further reduced by the bushing 5 in the high frequency range and consumes energy. After the two paths are connected in series, the entire suspension system provides "two-stage" resistance to the motor noise transmitted by the structure, so that the vibration cannot be directly transmitted to the vehicle body. Thus, with fewer parts and smaller size, it can simultaneously take into account low-frequency steady-state support and high-frequency noise suppression, significantly improving the sound and vibration comfort inside the vehicle.

[0024] See Figures 2-4 Optionally, a limiting plate 512 extends radially along the axial side of the inner core 51.

[0025] In this embodiment, the limiting plate 512 is used to prevent the bushing 5 from coming out of the mounting hole 4 when subjected to reverse impact or vibration, which greatly enhances the reliability and safety of bushing 5 installation, avoids the failure of the entire secondary vibration isolation function due to bushing 5 falling off, and improves the durability of the product.

[0026] See Figures 2-4 Optionally, the limiting plate 512 is annular, and the longest outer diameter of the limiting plate 512 is greater than the inner diameter of the mounting hole 4.

[0027] In this embodiment, the limiting plate 512 and the inner core 51 are an integral whole, forming an "I" shaped cross section. The annular structure provides uniform circumferential limiting, achieving 360° uniform limiting and avoiding stress concentration.

[0028] See Figures 2-4 Optionally, the elastic body 52 has protrusions 521 extending radially on both sides of its axial direction, and the protrusions 521 contact the inner side of the limiting plate 512.

[0029] In this embodiment, the protrusions 521 at both ends guide more vibration energy to dissipate through the elastic body 52, and also provide additional support for the bushing 5, enhancing its stability. Furthermore, the protrusions 521, in conjunction with the limiting plate 512, limit excessive relative displacement between the inner core 51 and the elastic body 52 to a certain extent.

[0030] See Figures 2-4 Optionally, the outer ring of the protrusion 521 is provided with a first groove 522.

[0031] In this embodiment, the first groove 522 forms a locally thinned area on the outer ring of the protrusion 521. When the protrusion 521 is deformed by pressure, the material can flow into the groove, thereby optimizing the damping effect.

[0032] See Figures 2-4 Optionally, the outer tube 53 has a flange 531 extending radially along its circumferential side, which is used to prevent the elastomer 52 from rubbing against adjacent parts.

[0033] In this embodiment, the flange 531 isolates the elastomer 52 from the surface of the adjacent active side bracket 1, thus avoiding rubber wear failure and abnormal noise that may be caused by friction.

[0034] See Figures 2-4 Optionally, the flange 531 contacts the surface of the active side bracket 1 to limit the axial displacement of the bushing 5.

[0035] In this embodiment, the flange 531 can cooperate with the limiting plate 512 to provide bidirectional constraint on the bushing 5, further enhancing the stability of the bushing 5 during operation and preventing it from shifting during vibration.

[0036] See Figures 2-4 Optionally, a radial gap 6 is provided at the middle position of the bushing 5. The radial gap 6 divides the elastic body 52 into an upper elastic part 523 and a lower elastic part 524 along the axial direction to form an independent vibration isolation path with upper and lower halves.

[0037] In this embodiment, a gap is left in the middle of the bushing 5 to ensure that the bushing 5 is pressed into place. The radial gap 6 divides the elastomer 52 into two parts, creating two mechanically independent vibration isolation units. The vibration energy is diverted to the upper and lower elastic parts for independent dissipation. The upper elastic part 523 and the lower elastic part 524 can independently respond to excitations of different directions or frequencies, which greatly reduces the radial dynamic stiffness of the bushing 5 and significantly improves the vibration isolation performance of the bushing 5.

[0038] See Figures 2-4 Optionally, a second groove 525 is provided on the opposite sides of the upper elastic part 523 and the lower elastic part 524.

[0039] In this embodiment, by opening a second groove 525 on each side of the upper elastic part 523 and the lower elastic part 524, the elastic body 52 is locally thinned. When vibration is transmitted, the groove first produces a large elastic deformation, and the local stiffness naturally decreases, forming a "soft zone". High-frequency energy is absorbed and dissipated more in this zone, thereby further weakening the transmission of motor whistling without adding parts or increasing the volume of the entire bushing 5, further reducing high-frequency noise in the vehicle and improving ride comfort.

[0040] See Figures 2-4 Optionally, the outer surface of the elastomer 52 and the inner wall of the outer tube 53 are tightly fitted together after press-fitting to form an interference fit, and the outer tube 53 and the mounting hole 4 of the active side bracket 1 are also interference fits. In this embodiment, by pressing the entire radial surface of the bushing tightly onto the bracket, the bushing can react quickly when the motor vibrates, and it is not easy for minute slippage that is difficult to be seen with the naked eye to occur between the bushing and the bracket, thereby further eliminating frictional noise caused by micro-slippage.

[0041] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A left-mounted active-side two-stage vibration isolation structure for mounting on a motor, characterized in that, It includes an active side support (1), a passive side support (2), a main spring (3), and a bushing (5); the inner frame of the main spring (3) is vulcanized and fixed to the active side support (1), and the outer frame of the main spring (3) is vulcanized and fixed to the passive side support (2); the active side support (1) has a mounting hole (4) on one side, and the bushing (5) is set in the mounting hole (4) to form a second-level vibration isolation; The bushing (5) includes an inner core (51), an elastomer (52) vulcanized and covered outside the inner core (51), and an outer tube (53) sleeved outside the elastomer (52). The inner core (51) has a through hole (511), and the motor fixing bolt of the motor is used to pass through the through hole (511) to connect with the active side bracket (1).

2. The left-suspension active-side secondary vibration isolation structure according to claim 1, characterized in that, The inner core (51) has a limiting plate (512) extending radially along its axial side.

3. The left-suspension active-side secondary vibration isolation structure according to claim 2, characterized in that, The limiting plate (512) is annular, and the longest outer diameter of the limiting plate (512) is greater than the inner diameter of the mounting hole (4).

4. The left-suspension active-side secondary vibration isolation structure according to claim 3, characterized in that, The elastic body (52) has a protrusion (521) extending radially on the axial side, and the protrusion (521) contacts the inner side of the limiting plate (512).

5. The left-suspension active-side secondary vibration isolation structure according to claim 4, characterized in that, The outer ring of the protrusion (521) has a first groove (522).

6. The left-suspension active-side secondary vibration isolation structure according to claim 5, characterized in that, The outer tube (53) has a flange (531) extending radially on its circumferential side, the flange (531) being used to prevent the elastomer (52) from rubbing against adjacent components.

7. The left-suspension active-side secondary vibration isolation structure according to claim 6, characterized in that, The flange (531) contacts the surface of the active side bracket (1) to limit the axial displacement of the bushing (5).

8. The left-suspension active-side secondary vibration isolation structure according to claim 1 or 7, characterized in that, The bushing (5) has a radial gap (6) at the middle position. The radial gap (6) divides the elastic body (52) into an upper elastic part (523) and a lower elastic part (524) along the axial direction to form an independent vibration isolation path with upper and lower halves.

9. The left-suspension active-side secondary vibration isolation structure according to claim 8, characterized in that, The upper elastic part (523) and the lower elastic part (524) are provided with a second groove (525) on opposite sides.

10. The left-suspension active-side secondary vibration isolation structure according to claim 9, characterized in that, The outer surface of the elastomer (52) and the inner wall of the outer tube (53) are tightly fitted together after press fitting, forming an interference fit. The outer tube (53) and the mounting hole (4) of the active side bracket (1) are also interference fits.

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