Design method of pressing plate structure

Abstract

The invention provides a design method of a pressing plate structure, and relates to the technical field of vehicles. According to the design method of the pressing plate structure, the pressing plate structure is divided into a contact pressure passivation area and a contact pressure sensitive area, and the selected contact pressure sensitive area faces the second radius of the surface of the plate spring and the size of the pressing plate structure in the third direction so that the contact pressure sensitive area can be located on the side, back to the plate spring, of the datum plane. When the pressing plate structure is applied to the plate spring assembly, the deformation quantity of the position, corresponding to the contact pressure sensitive area, of the plate spring is large, and the contact pressure sensitive area is located on the side, back to the plate spring, of the datum plane. When the plate spring is in a free state, the contact pressure sensitive area does not make contact with the plate spring, and when the plate spring is stressed to deform, the load applied to the plate spring by the contact pressure sensitive area is reduced, so that the risk of crushing of the composite material plate spring is reduced, the fatigue life of the plate spring is prolonged, and the reliability and durability of a suspension system are improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a design method for a pressure plate structure. Background Art

[0002] The leaf spring assembly is an important part of the automobile suspension. The leaf spring is assembled to the axle through fastening components such as the pressure plate structure, clamps and riding bolts. The surface of the pressure plate structure in contact with the leaf spring is a curved surface, and its radius is equal to the radius of the surface of the leaf spring facing the pressure plate structure, so that the pressure plate structure can completely fit the leaf spring. The leaf spring can transfer the load between the axle and the frame, and play a role in vibration reduction and load bearing. The composite leaf spring manufactured based on the concept of "plastic instead of steel" has a simple structure, simplified assembly, and significantly improved fatigue endurance life while reducing its own weight.

[0003] However, the surface hardness of the composite leaf spring is significantly lower than that of the steel leaf spring. During the deformation of the composite leaf spring under load, the deformation on both sides of the composite leaf spring is large. Under the action of the pressure plate structure, the composite leaf spring is easily crushed, which reduces the fatigue life of the composite leaf spring and further affects the reliability and durability of the suspension system. Summary of the invention

[0004] In view of this, the present application provides a design method of a pressure plate structure, and solves the problem that during the process of the composite leaf spring being loaded and deformed, the deformation on both sides of the composite leaf spring is large, and the composite leaf spring is easily crushed under the action of the pressure plate structure, which reduces the fatigue life of the composite leaf spring and further affects the reliability and durability of the suspension system.

[0005] The present application provides a design method for a pressure plate structure, the design method for the pressure plate structure is used to design a pressure plate structure, the pressure plate structure is used to contact a leaf spring, and the design method for the pressure plate structure includes:

[0006] S1, a determination step, determining the dimensions of the pressure plate structure in a first direction and a second direction based on a vehicle model;

[0007] S2, a dividing step, dividing the pressure plate structure into a contact pressure passivation area and a contact pressure sensitive area, determining a first radius of the contact pressure passivation area facing the surface of the leaf spring and a size of the contact pressure passivation area in the first direction;

[0008] S3, a selection step, defining a curved surface with a radius equal to the first radius as a reference curved surface, the surface of the contact pressure passivation area facing the leaf spring coincides with the reference curved surface, selecting a second radius of the surface of the contact pressure sensitive area facing the leaf spring and a dimension of the pressure plate structure in a third direction, so that the contact pressure sensitive area is located on a side of the reference curved surface facing away from the leaf spring, wherein the first direction, the second direction and the third direction are perpendicular to each other;

[0009] S4, verification step, analyzing the pressure plate structure to obtain the theoretical failure pressure of the pressure plate structure, comparing the theoretical failure pressure with the predetermined failure pressure, if the theoretical failure pressure meets the predetermined failure pressure, confirming the pressure plate structure, if the theoretical failure pressure does not meet the predetermined failure pressure, re-executing the selection step.

[0010] Preferably, the determining step comprises:

[0011] Based on the vehicle model, determining the model of the balance shaft housing and the model of the leaf spring;

[0012] Based on the model of the balance shaft housing and the model of the leaf spring, a size of the pressure plate structure in the first direction and a size of the second direction are determined.

[0013] Preferably, based on the model of the balancing shaft housing and the model of the leaf spring, the step of determining the size of the pressure plate structure in the first direction and the second direction comprises:

[0014] determining a size of the pressure plate structure in the first direction based on a size of the balancing shaft housing in the first direction;

[0015] A size of the pressure plate structure in the second direction is determined based on a size of the leaf spring in the second direction.

[0016] Preferably, the step of dividing the pressure plate structure into a contact pressure passivation area and a contact pressure sensitive area comprises:

[0017] Selecting a preset pressure plate structure based on the model of the balance shaft housing and the model of the leaf spring;

[0018] The preset pressure plate structure is analyzed to determine a preset area, wherein a size of the preset area in the first direction is equal to a size of the contact pressure passivation zone in the first direction.

[0019] Preferably, the variation of the load applied by the preset area to the leaf spring satisfies a preset variation, and the deformation of a portion of the leaf spring corresponding to the preset area satisfies a preset deformation.

[0020] Preferably, the pressure plate structure includes a symmetry plane perpendicular to the first direction, the two parts of the contact pressure passivation zone located on both sides of the symmetry plane are symmetrical about the symmetry plane, the contact pressure sensitive zone is divided into two parts by the contact pressure sensitive zone, and the two parts of the contact pressure sensitive zone are symmetrical about the symmetry plane.

[0021] Preferably, the first radius is equal to the radius of the surface of the preset area facing the pressure plate structure, and the size of the contact pressure passivation zone in the third direction is equal to the size of the preset area in the third direction.

[0022] Preferably, a size of the contact pressure passivation zone in the first direction is 1 / 3-2 / 3 of a size of the pressure plate structure in the first direction.

[0023] Preferably, in the selecting step, the second radius is selected within a first range, and the first range is from 1 / 3 of the first radius to 3 times of the first radius.

[0024] Preferably, the dimension of the preset pressing plate structure in the third direction is a preset value;

[0025] In the selection step, the size of the pressure plate structure in the third direction is selected within a second range, and the second range is smaller than the preset value.

[0026] The design method of the pressure plate structure of the present application divides the pressure plate structure into a contact pressure passivation zone and a contact pressure sensitive zone. The selected second radius of the surface of the contact pressure sensitive zone facing the leaf spring and the size of the pressure plate structure in the third direction can make the contact pressure sensitive zone located on the side of the reference plane facing away from the leaf spring. When the pressure plate structure designed by the design method of the pressure plate structure is applied to the leaf spring assembly, the deformation amount of the leaf spring at the position corresponding to the contact pressure sensitive zone is large, because the contact pressure sensitive zone is located on the side of the reference plane facing away from the leaf spring. When the leaf spring is in a free state, the contact pressure sensitive zone does not contact the leaf spring, and the position corresponding to the contact pressure sensitive zone can provide more deformation space for the leaf spring. When the leaf spring is deformed by force, the load applied to the leaf spring by the contact pressure sensitive zone is reduced, thereby reducing the risk of crushing the composite leaf spring, improving the fatigue life of the leaf spring, and further improving the reliability and durability of the suspension system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A flow chart showing a design method for a platen structure;

[0029] Figure 2 A schematic diagram showing the structure of the leaf spring in the leaf spring assembly when it is in a free state;

[0030] Figure 3 A schematic diagram showing the structure of a leaf spring in a leaf spring assembly when the leaf spring is in a flattened state;

[0031] Figure 4 A structural schematic diagram showing a pressing plate structure;

[0032] Figure 5 A partial structural schematic diagram of a leaf spring assembly is shown.

[0033] Icons: 1-pressure block; 2-rider bolt; 3-pressure plate structure; 31-contact pressure passivation area; 32-contact pressure sensitive area; 4-leaf spring; 5-clamp; 6-balance shaft housing; W-first direction; N-third direction. DETAILED DESCRIPTION

[0034] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0035] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0036] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0037] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0038] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0039] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0040] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0041] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0042] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0043] In the leaf spring assembly, the pressure plate structure 3 is arranged on one side of the leaf spring 4, and a clamping plate 5 is arranged on the other side of the leaf spring 4 opposite to the pressure plate structure 3. A pressure block 1 is arranged on the side of the pressure plate structure 3 facing away from the leaf spring 4. The riding bolt 2 bypasses the pressure block 1 and is connected to the balance shaft housing 6 on the lower side of the clamping plate 5, thereby fixing the leaf spring 4. When the leaf spring 4 is in a free state, such as Figure 2 As shown, the leaf spring 4 is in a curved shape. After the leaf spring 4 is deformed by force, as shown in FIG. Figure 3 As shown, the leaf spring 4 is flattened, and the deformation of the leaf spring 4 on both sides in the first direction W is greater than the deformation of the leaf spring 4 in the middle in the first direction W. The loads applied to the leaf spring 4 by both sides of the pressure plate structure 3 are relatively large, which makes the risk of crushing the composite leaf spring relatively large. Based on this, a design method for the leaf spring 4 structure of the present application is proposed.

[0044] like Figure 1 As shown, the design method of the pressure plate structure 3 includes:

[0045] S1, a determination step, determining a dimension a of the pressure plate structure 3 in a first direction W and a dimension in a second direction based on a vehicle model;

[0046] S2, a division step, dividing the pressure plate structure 3 into a contact pressure passivation area 31 and a contact pressure sensitive area, determining a first radius R1 of the surface of the contact pressure passivation area 31 facing the leaf spring 4 and a size b of the contact pressure passivation area 31 in the first direction W;

[0047] S3, a selection step, defining a curved surface with a radius equal to the first radius R1 as a reference curved surface, the surface of the contact pressure passivation area 31 facing the leaf spring 4 coincides with the reference curved surface, selecting a second radius R2 of the surface of the contact pressure sensitive area 32 facing the leaf spring 4 and a dimension c of the pressure plate structure 3 in the third direction N, so that the contact pressure sensitive area 32 is located on the side of the reference curved surface facing away from the leaf spring 4, wherein the first direction W, the second direction and the third direction N are perpendicular to each other;

[0048] S4, verification step, analyzing the pressure plate structure 3, obtaining the theoretical failure pressure of the pressure plate structure 3, comparing the theoretical failure pressure with the predetermined failure pressure, if the theoretical failure pressure meets the predetermined failure pressure, then confirming the pressure plate structure 3, if the theoretical failure pressure does not meet the predetermined failure pressure, then re-execute the selection step.

[0049] like Figure 4 and Figure 5 As shown, the design method of the pressure plate structure 3 of the present application divides the pressure plate structure 3 into a contact pressure passivation area 31 and a contact pressure sensitive area 32. The selected second radius R2 of the surface of the contact pressure sensitive area 32 facing the leaf spring 4 and the size of the pressure plate structure 3 in the third direction N can make the contact pressure sensitive area 32 located on the side of the reference plane facing away from the leaf spring 4. When the pressure plate structure 3 designed by the design method of the pressure plate structure 3 is applied to the leaf spring assembly, the deformation amount of the leaf spring 4 at the position corresponding to the contact pressure sensitive area 32 is large, because the contact pressure sensitive area 32 is located on the side of the reference plane facing away from the leaf spring 4. When the leaf spring 4 is in a free state, the contact pressure sensitive area 32 does not contact the leaf spring 4, and the position corresponding to the contact pressure sensitive area 32 can provide more deformation space for the leaf spring 4. When the leaf spring 4 is deformed by force, the load applied to the leaf spring 4 by the contact pressure sensitive area 32 is reduced, thereby reducing the risk of crushing the composite leaf spring 4, improving the fatigue life of the leaf spring 4, and further improving the reliability and durability of the suspension system.

[0050] Further, the determining step S1 includes:

[0051] S11, determining the model of the balance shaft housing 6 and the model of the leaf spring 4 based on the vehicle model;

[0052] S12. Based on the model of the balancing shaft housing 6 and the model of the leaf spring 4, determine the dimension a of the pressure plate structure 3 in the first direction W and the dimension in the second direction.

[0053] In step S12 , the dimension a of the pressure plate structure 3 in the first direction W is determined based on the dimension of the balancing shaft housing 6 in the first direction W; and the dimension of the pressure plate structure 3 in the second direction is determined based on the dimension of the leaf spring 4 in the second direction.

[0054] Specifically, the dimension a of the pressure plate structure 3 in the first direction W is equal to the product of the dimension of the balancing shaft housing 6 in the first direction W and the adjustment parameter, and the adjustment parameter is 0.9-1.1. Preferably, the adjustment parameter is 1, at which time, the dimension a of the pressure plate structure 3 in the first direction W is equal to the dimension of the balancing shaft housing 6 in the first direction W. The dimension of the pressure plate structure 3 in the second direction is equal to the dimension of the leaf spring 4 in the second direction. Based on this, the dimension a of the pressure plate structure 3 in the first direction W and the dimension in the second direction can be obtained.

[0055] Furthermore, in step S2, the pressure plate structure 3 may be divided into the contact pressure passivation area 31 and the contact pressure sensitive area 32 in the following manner:

[0056] S21. Based on the model of the balance shaft housing 6 and the model of the leaf spring 4, a preset pressure plate structure 3 is selected.

[0057] Specifically, based on the model of the vehicle, the model of the balancing shaft housing 6 and the model of the leaf spring 4 can be determined. Based on the model of the balancing shaft housing 6 and the model of the leaf spring 4, the existing pressure plate structure 3 corresponding to the balancing shaft housing 6 and the leaf spring 4 can be determined. The pressure plate structure 3 is a preset pressure plate structure 3. When the leaf spring 4 is not deformed, the surface of the preset pressure plate structure 3 facing the leaf spring 4 is completely in contact with the leaf spring 4, and the radius of the surface of the preset pressure plate structure 3 facing the leaf spring 4 is equal to the radius of the surface of the leaf spring 4 facing the preset pressure plate structure 3.

[0058] S22 , analyzing the preset pressure plate structure 3 to determine a preset area, wherein a size of the preset area in the first direction W is equal to a size b of the contact pressure passivation area 31 in the first direction W.

[0059] Specifically, it is found through analysis of the preset pressure plate structure 3 that after the leaf spring 4 is deformed under load, the deformation amount of the portion of the leaf spring 4 corresponding to the middle portion of the preset pressure plate structure 3 in the first direction W is small, and the deformation amount of the portion of the leaf spring 4 corresponding to the two sides of the preset pressure plate structure 3 in the first direction W is large. In the process of the leaf spring 4 being deformed under load, the change amount of the load applied to the leaf spring 4 by the middle portion of the preset pressure plate structure 3 is small, and the change amount of the load applied to the leaf spring 4 by the two sides of the preset pressure plate structure 3 is large. By analyzing the preset pressure plate structure 3, the change in the load applied by the preset pressure plate structure 3 to the leaf spring 4 satisfies the preset change, and the corresponding part of the deformation of the leaf spring 4 that satisfies the preset deformation is defined as a preset area. The change in the load applied to the leaf spring 4 by the preset area is small, and the deformation of the part of the leaf spring 4 corresponding to the preset area is small, and the risk of the leaf spring 4 being crushed by the preset area is small. Therefore, the contact pressure passivation area 31 can adopt a structure that is exactly the same as the preset area, that is, the size b of the contact pressure passivation area 31 in the first direction W is equal to the size of the preset area in the first direction W, the first radius R1 of the contact pressure passivation area 31 toward the leaf spring 4 is equal to the radius of the surface of the preset area facing the pressure plate structure 3, and the size of the contact pressure passivation area 31 in the third direction N is equal to the size of the preset area in the third direction N.

[0060] Optionally, the preset pressure plate structure 3 may be analyzed by Abaqus software, and the above-mentioned preset variation and preset deformation may be selected by the designer based on design requirements.

[0061] In addition, the surface of the contact pressure passivation zone 31 facing away from the leaf spring 4 and the surface of the contact pressure sensitive zone 32 facing away from the leaf spring 4 are both planes, and the surface of the contact pressure passivation zone 31 facing away from the leaf spring 4 and the surface of the contact pressure sensitive zone 32 facing away from the leaf spring 4 are flush. The surface of the contact pressure passivation zone 31 facing the leaf spring 4 and the surface of the contact pressure sensitive zone 32 facing the leaf spring 4 are both curved surfaces, and the curved surface may be a part of the side surface of a cylinder.

[0062] Further, the pressure plate structure 3 is a symmetrical structure, the pressure plate structure 3 includes a symmetry plane perpendicular to the first direction W, the symmetry plane is perpendicular to the first direction W, the two parts of the contact pressure passivation area 31 located on both sides of the symmetry plane are symmetrical about the symmetry plane, the contact pressure sensitive area 32 is divided into two parts by the contact pressure sensitive area 32, and the two parts of the contact pressure sensitive area 32 are symmetrical about the symmetry plane. In the above manner, the size of the two parts of the contact pressure sensitive area 32 in the first direction W can be confirmed.

[0063] Preferably, a dimension b of the contact pressure passivation area 31 in the first direction W is 1 / 3-2 / 3 of a dimension a of the pressure plate structure 3 in the first direction W.

[0064] In the selection step S3, since the radius of the reference curved surface is equal to the first radius R1, the reference curved surface coincides with the surface of the contact pressure passivation zone 31 facing the leaf spring 4. The second radius R2 is selected within the first range, and the first range is 1 / 3 of the first radius R1 to 3 times the first radius R1. The dimension c of the pressure plate structure 3 in the third direction N is selected within the second range, and the dimension of the pressure plate structure in the third direction N is preset to a preset value, and the second range is less than the preset value. The above selected values ​​require that the contact pressure sensitive area 32 is located on the side of the reference curved surface facing away from the leaf spring 4. When the leaf spring 4 is in a free state, the contact pressure sensitive area 32 does not contact the leaf spring 4, and the position corresponding to the contact pressure sensitive area 32 can provide more deformation space for the leaf spring 4. When the leaf spring 4 is deformed by force, the load applied to the leaf spring 4 by the contact pressure sensitive area 32 is reduced, thereby reducing the risk of crushing the composite leaf spring 4, improving the fatigue life of the leaf spring 4, and thus improving the reliability and durability of the suspension system.

[0065] In the verification step S4, the pressure plate structure 3 is analyzed to obtain the theoretical failure pressure of the pressure plate structure 3, and the theoretical failure pressure is compared with the predetermined failure pressure. If the theoretical failure pressure is greater than or equal to the predetermined failure pressure, the pressure plate structure 3 is determined. If the theoretical failure pressure is less than the predetermined failure pressure, the selection step is re-executed until the theoretical failure pressure of the pressure plate structure 3 is greater than or equal to the predetermined failure pressure.

[0066] Optionally, the predetermined failure pressure mentioned above can be selected according to design requirements.

[0067] Preferably, the above-mentioned selection step S3 and verification step S4 can be performed by hyperstudy software, which can perform topology optimization design, so that the pressure plate structure 3 that can satisfy the theoretical failure pressure greater than or equal to the predetermined failure pressure can be directly obtained by hyperstudy software.

[0068] In addition, the pressure plate structure 3 also includes a first surface and a second surface opposite to each other in the first direction W. The first surface and the second surface can be planes or curved surfaces. The forms of the first surface and the second surface can be selected according to processing cost and processing difficulty.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing a pressure plate structure, the method for designing a pressure plate structure is used to design a pressure plate structure, the pressure plate structure is used to contact with a leaf spring, and is characterized in that: The design method of the pressure plate structure includes: S1, a determination step, determining the dimensions of the pressure plate structure in a first direction and a second direction based on the model of the vehicle; S2, a dividing step, dividing the pressure plate structure into a contact pressure passivation area and a contact pressure sensitive area, determining a first radius of the contact pressure passivation area facing the surface of the leaf spring and a size of the contact pressure passivation area in the first direction; S3, a selection step, defining a curved surface with a radius equal to the first radius as a reference curved surface, the surface of the contact pressure passivation area facing the leaf spring coincides with the reference curved surface, selecting a second radius of the surface of the contact pressure sensitive area facing the leaf spring and a dimension of the pressure plate structure in a third direction, so that the contact pressure sensitive area is located on a side of the reference curved surface facing away from the leaf spring, wherein the first direction, the second direction and the third direction are perpendicular to each other; S4, verification step, analyzing the pressure plate structure to obtain the theoretical failure pressure of the pressure plate structure, comparing the theoretical failure pressure with the predetermined failure pressure, if the theoretical failure pressure meets the predetermined failure pressure, confirming the pressure plate structure, if the theoretical failure pressure does not meet the predetermined failure pressure, re-executing the selection step.

2. The design method of the pressure plate structure according to claim 1, characterized in that: The determining step comprises: Based on the vehicle model, determining the model of the balance shaft housing and the model of the leaf spring; Based on the model of the balance shaft housing and the model of the leaf spring, a size of the pressure plate structure in the first direction and a size of the second direction are determined.

3. The design method of the pressure plate structure according to claim 2, characterized in that: Based on the model of the balancing shaft housing and the model of the leaf spring, the step of determining the size of the pressure plate structure in the first direction and the second direction comprises: determining a size of the pressure plate structure in the first direction based on a size of the balancing shaft housing in the first direction; A size of the pressure plate structure in the second direction is determined based on a size of the leaf spring in the second direction.

4. The design method of the pressure plate structure according to claim 2, characterized in that: The step of dividing the pressure plate structure into a contact pressure passivation area and a contact pressure sensitive area comprises: Selecting a preset pressure plate structure based on the model of the balance shaft housing and the model of the leaf spring; The preset pressure plate structure is analyzed to determine a preset area, wherein a size of the preset area in the first direction is equal to a size of the contact pressure passivation zone in the first direction.

5. The design method of the pressure plate structure according to claim 4, characterized in that: The change amount of the load applied by the preset area to the leaf spring satisfies the preset change amount, and the deformation amount of the portion of the leaf spring corresponding to the preset area satisfies the preset deformation amount.

6. The design method of the pressure plate structure according to claim 4 or 5, characterized in that: The pressure plate structure includes a symmetry plane perpendicular to the first direction, the two parts of the contact pressure passivation zone located on both sides of the symmetry plane are symmetrical about the symmetry plane, the contact pressure sensitive zone is divided into two parts by the contact pressure sensitive zone, and the two parts of the contact pressure sensitive zone are symmetrical about the symmetry plane.

7. The design method of the pressure plate structure according to claim 6, characterized in that: The first radius is equal to the radius of the surface of the preset area facing the pressure plate structure, and the size of the contact pressure passivation zone in the third direction is equal to the size of the preset area in the third direction.

8. The design method of the pressure plate structure according to claim 5, characterized in that: The size of the contact pressure passivation zone in the first direction is 1 / 3-2 / 3 of the size of the pressure plate structure in the first direction.

9. The design method of the pressure plate structure according to claim 5, characterized in that: In the selecting step, the second radius is selected within a first range, and the first range is from 1 / 3 of the first radius to 3 times of the first radius.

10. The design method of the pressure plate structure according to claim 9, characterized in that: The dimension of the preset pressing plate structure in the third direction is a preset value; In the selection step, the size of the pressure plate structure in the third direction is selected within a second range, and the second range is smaller than the preset value.

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