Variable stiffness motor suspension assembly

Abstract

The utility model belongs to the technical field of motor suspension, and provides a variable stiffness motor suspension assembly which comprises an upper rubber mat, a lower rubber mat, a motor installation support and a suspension support, the lower rubber mat is arranged below the upper rubber mat, through holes are coaxially formed in the upper rubber mat and the lower rubber mat in the axial direction, and metal linings are arranged in the through holes in an interference mode; the isolation part of the motor mounting bracket is arranged between the upper rubber mat and the lower rubber mat, a fixing hole is formed in the motor mounting bracket, and the bottom of the upper rubber mat is arranged in the fixing hole in an interference manner; an annular groove is formed in the bottom of the motor installation support, and the top of the lower rubber mat is arranged in the annular groove. According to the utility model, the annular groove of the isolation part of the motor mounting bracket is improved and the lower rubber pad with a secondary rigidity design is matched; when the torque is small, only the bottom surface of the annular groove is in contact with the lower rubber mat, and the suspension system has a better vibration isolation rate; when the torque is large, the isolation part and the bottom face of the annular groove are both in contact with the lower rubber mat, and the suspension system has high impact deformation resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of motor suspension, in particular to a variable stiffness motor suspension assembly. Background Art

[0002] At present, the passenger car drive motor suspension on the market generally adopts a compression type structure suspension cushion, which is connected to the motor mounting bracket vehicle frame end bracket through the upper and lower frame plates. The defect of the compression type suspension cushion is that the compression shear is relatively large. In order to alleviate the low-speed high-torque impact vibration, the cushion stiffness has to be increased, thereby sacrificing the high-speed vibration isolation effect; at the same time, the compression type suspension cushion cannot withstand large tensile forces. Under the conditions of repeated starting, forward and reverse rotation of the drive motor, the suspension is easy to tear and debond. Once the rubber is damaged, the motor is easy to fall off the frame, posing a safety hazard. For new energy drive motors, the ideal suspension should have high stiffness at low speed and low stiffness at high speed.

[0003] In response to this problem, some new suspension configurations have appeared on the market, which are assembled through upper rubber pads and lower rubber pads and bolts that cooperate with the body mounting bracket. Based on this, the vibration generated during the operation of the vehicle is reduced. In the case of fatigue attenuation and quality defects of the upper and lower rubber pads, there is a rigid connection between the motor and the vehicle bracket through the body mounting bracket and bolts to prevent the motor from falling off the frame due to rubber failure and reduce safety hazards. However, the stiffness of this suspension configuration is not variable, and it cannot simultaneously meet the requirements of the drive motor torque characteristics for the suspension system under high-speed and low-speed conditions. Utility Model Content

[0004] In view of the defects in the prior art, the utility model provides a variable stiffness motor suspension assembly to solve the problem that the stiffness of the current motor suspension configuration is not variable and cannot simultaneously meet the requirements of the drive motor torque characteristics on the suspension system under high-speed and low-speed conditions.

[0005] The utility model provides a variable stiffness motor suspension assembly, comprising:

[0006] Glue pad;

[0007] A lower rubber pad is arranged below the upper rubber pad, the upper rubber pad and the lower rubber pad are coaxially provided with through holes, a metal bushing is arranged in the through hole, and the metal bushing is interference fit with the upper rubber pad and the lower rubber pad;

[0008] A motor mounting bracket, wherein the isolation portion of the motor mounting bracket is arranged between the upper rubber pad and the lower rubber pad, the isolation portion is provided with a fixing hole, and the bottom of the upper rubber pad is arranged in the fixing hole; the bottom of the isolation portion is provided with an annular groove around the fixing hole, and the top of the lower rubber pad is arranged in the annular groove;

[0009] The suspension support is arranged under the lower rubber pad; the upper rubber pad, the isolation part, the lower rubber pad and the suspension support are connected by bolts that penetrate through them.

[0010] It can be seen from the above technical scheme that the utility model provides a variable stiffness suspension assembly, which reserves deformation space for the lower rubber pad during static assembly by opening an annular groove at the bottom of the isolation part of the motor mounting bracket. At the same time, the annular groove can limit the lateral deformation of the lower rubber pad, thereby reducing rubber damage caused by repeated starting, forward rotation and reverse rotation of the motor.

[0011] Optionally, the upper rubber pad is a T-shaped structure, and the lower rubber pad is an inverted T-shaped structure.

[0012] Optionally, the lower rubber pad is integrally formed with a first cylindrical segment and a second cylindrical segment from top to bottom, the outer diameter of the first cylindrical segment is smaller than the outer diameter of the second cylindrical segment, and the top of the first cylindrical segment is arranged in the annular groove.

[0013] Optionally, the height of the first cylindrical section is greater than the depth of the annular groove. When the motor is at rated torque, the longitudinal deformation and lateral deformation of the lower rubber pad are determined by the longitudinal and lateral gaps between the motor mounting bracket and the lower rubber pad, which provides deformation space for the lower rubber pad and limits excessive deformation.

[0014] Optionally, the outer diameter of the second cylindrical segment is greater than the outer diameter of the upper rubber pad.

[0015] By adopting the above technical solution, this application has the following technical effects:

[0016] The utility model combines the motor mounting bracket, the upper and lower rubber pads and the suspension support in the motor variable stiffness motor suspension assembly. Firstly, the upper rubber pad and the lower rubber pad are used to reduce the vibration generated during the operation of the vehicle. When the upper rubber pad and the lower rubber pad are fatigued and have quality defects, the motor mounting bracket and the frame suspension support are rigidly connected by bolts to reduce low-speed impact and improve high-speed vibration isolation rate.

[0017] The utility model improves the isolation part of the motor mounting bracket and opens an annular groove at the bottom of the isolation part. When the torque is small, only the bottom surface of the annular groove is in contact with the lower rubber pad. At this time, the rigidity is small, and the suspension system has a good vibration isolation rate. When the torque is large, the bottom surface of the isolation part of the motor mounting bracket and the bottom surface of the annular groove are both in contact with the lower rubber pad. At this time, the rigidity is large, and the suspension system has a strong ability to resist impact deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0019] Figure 1 A top view of the upper rubber pad and the lower rubber pad provided in the embodiment of the utility model;

[0020] Figure 2 for Figure 1 AA section view;

[0021] Figure 3 A cross-sectional view of a variable stiffness motor suspension assembly provided in an embodiment of the utility model.

[0022] Reference numerals:

[0023] 1-upper rubber pad; 2-metal bushing; 3-lower rubber pad; 4-suspension support; 5-bolt; 6-washer; 7-isolating part; 8-nut. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0025] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] like Figure 1-3 As shown, a variable stiffness motor suspension assembly provided in this embodiment includes an upper rubber pad 1, a lower rubber pad 3, a motor mounting bracket and a suspension support 4, the lower rubber pad 3 is arranged below the upper rubber pad 1, and the upper rubber pad 1 and the lower rubber pad 3 are coaxially provided with through holes, and metal bushings 2 are arranged in the through holes, and the metal bushings 2 are respectively interference fit with the upper rubber pad 1 and the lower rubber pad 3; the isolation portion 7 of the motor mounting bracket is arranged between the upper rubber pad 1 and the lower rubber pad 3, the motor mounting bracket is provided with a fixing hole, and the bottom of the upper rubber pad 1 is arranged in the fixing hole; the bottom of the motor mounting bracket is provided with an annular groove around the fixing hole, and the top of the lower rubber pad 3 is arranged in the annular groove; the suspension support 4 is arranged below the lower rubber pad 3; the upper rubber pad 1, the motor mounting bracket, the lower rubber pad 3 and the suspension support 4 are connected by bolts 5 arranged through them.

[0030] See also Figure 3 The upper surfaces of the upper rubber pad 1 and the metal bushing 2 are in the same plane and are vulcanized. The lower surfaces of the metal bushing 2 and the lower rubber pad 3 are in the same plane. A washer 6 is also provided on the upper surface of the upper rubber pad 1. A bolt penetrates the washer 6, the upper rubber pad 1, the metal bushing 2, the isolation part 7, the lower rubber pad 3 and the suspension support 4 in sequence and is locked by a nut.

[0031] See also Figure 2-3, the upper rubber pad 1 is a T-shaped structure, and the lower rubber pad 3 is an inverted T-shaped structure. The lower rubber pad 3 is integrally formed with a first cylindrical section and a second cylindrical section from top to bottom. The outer diameter of the first cylindrical section is smaller than the outer diameter of the second cylindrical section, and the top of the first cylindrical section is arranged in an annular groove. There is a first gap f between the inner wall of the annular groove and the outer wall of the first cylindrical section, and the height of the first cylindrical section is greater than the depth of the annular groove to form a second gap m. When the motor is at rated torque, the lateral deformation of the lower rubber pad 3 is the first gap f, and the longitudinal compression deformation is the second gap m. When the motor torque continues to increase, the lower rubber pad no longer produces lateral deformation due to the restriction of the annular groove on the first cylindrical section, and the second cylindrical section begins to deform under force and is always in contact with the motor mounting bracket.

[0032] In this embodiment, the outer diameter of the second cylindrical section is greater than the outer diameter of the upper rubber pad 1, and the lower rubber pad 3 realizes the secondary stiffness design by changing the rubber diameter. The stiffness of the first cylindrical section is K1 when in contact, and the stiffness of the second cylindrical section is increased to K2 when in contact, thereby providing better anti-impact deformation capability under high torque. At this time, the stiffness of the lower rubber pad 3 is K1+K2. When the deformation of the first cylindrical section of the lower rubber pad 3 exceeds a certain threshold range, the second cylindrical section also intervenes to increase the stiffness of the lower rubber pad 3 and reduce the deformation of the suspension system.

[0033] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A variable stiffness motor suspension assembly, characterized in that: include: Glue pad; A lower rubber pad is arranged below the upper rubber pad, the upper rubber pad and the lower rubber pad are coaxially provided with through holes, a metal bushing is arranged in the through hole, and the metal bushing is interference fit with the upper rubber pad and the lower rubber pad; A motor mounting bracket, wherein the isolation portion of the motor mounting bracket is arranged between the upper rubber pad and the lower rubber pad, the isolation portion is provided with a fixing hole, the bottom of the upper rubber pad is arranged in the fixing hole and has an interference fit with the fixing hole; the bottom of the isolation portion is provided with an annular groove around the fixing hole, and the top of the lower rubber pad is arranged in the annular groove; The suspension support is arranged under the lower rubber pad; the upper rubber pad, the isolation part, the lower rubber pad and the suspension support are connected by bolts that penetrate through them.

2. The variable stiffness motor suspension assembly according to claim 1, characterized in that: The upper rubber pad is a T-shaped structure, and the lower rubber pad is an inverted T-shaped structure.

3. The variable stiffness motor suspension assembly according to claim 2, characterized in that: The lower rubber pad is integrally formed with a first cylindrical section and a second cylindrical section from top to bottom, the outer diameter of the first cylindrical section is smaller than the outer diameter of the second cylindrical section, and the top of the first cylindrical section is arranged in the annular groove.

4. The variable stiffness motor suspension assembly according to claim 3, characterized in that: There is a gap between the inner wall of the annular groove and the outer wall of the first cylindrical section.

5. The variable stiffness motor suspension assembly according to claim 4, characterized in that: The height of the first cylindrical segment is greater than the depth of the annular groove.

6. The variable stiffness motor suspension assembly according to claim 3, characterized in that: The outer diameter of the second cylindrical section is greater than the outer diameter of the upper rubber pad.

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