A feasibility analysis method and system for reducing the height of a truck chassis

Abstract

The present application discloses a feasibility analysis method and system for reducing the chassis height of a truck. The method includes collecting variable parameters that affect the chassis height, dividing the variable parameters into two parts: the chassis part and the cab part; establishing a function model of the chassis part, the cab part, and the total height of the chassis by collecting the variable parameters; analyzing the factors that affect the variable parameters of the height model of the chassis and the cab part one by one, and establishing the priority order of the implementation factors according to the principle of minimum change. Finally, the requirement for reducing the total height of the chassis is achieved by combining the variable factors of the chassis and the cab part with a single variable or a combined variable method. This analysis method can meet a certain degree of height reduction requirements, is applicable to light and medium-sized trucks and special-purpose vehicles, and is widely applicable. It provides a feasibility height reduction analysis idea for relevant designers.

Description

Technical Field

[0001] The present application relates to the technical field of truck chassis height design, and in particular to a feasibility analysis method and system for reducing the height of a truck chassis. Background Art

[0002] The height limit of underground garages in old residential areas is 2.1m, while the chassis height of existing light trucks is above 2.1m, so vehicles cannot pass through the height limit. In order to reduce the height, the current models on the market sacrifice the comfort of the cockpit or weaken the load-bearing strength of the vehicle. The development of the model is not considered from the principle of minimum change to achieve the minimum change to meet the height reduction requirements.

[0003] Based on the existing models, collecting variable parameters of the chassis and cab parts, analyzing the influencing factors one by one, and conducting feasibility analysis of the truck chassis height is a current research hotspot. However, there is still a lack of a complete feasibility analysis method and system for reducing the chassis height of trucks. Summary of the invention

[0004] The present application provides a feasibility analysis method and system for lowering the chassis height of a truck, so as to solve the above-mentioned existing problems.

[0005] On the one hand, the present application provides a feasibility analysis method for lowering the chassis height of a truck, characterized in that the method comprises the following steps:

[0006] Step S1: Collect variable parameters that affect chassis height, and divide the variable parameters into two parts: chassis end and cab end;

[0007] Step S2: Establishing a chassis part, a cab part and a chassis total height function model by collecting variable parameters;

[0008] Step S3: Analyze the variable parameter factors that affect the height model of the chassis and cab part one by one, and establish the priority order of the implementation factors according to the principle of minimum change;

[0009] Step S4: The variable factors of the chassis and the cab are used as a single variable or a combination of variables to reduce the overall height of the chassis.

[0010] In one implementation of the present application, the step S1 specifically includes: collecting variable parameters H, H1, H2, H3, H4, H5, and H6 that affect the total height of the chassis, and dividing the parameters into chassis end part H2, H4, and H5 parameters and cab end part H1, H3, and H6 parameters; wherein H1 is the distance between the top of the cab and the fender, H2 is the static load diameter of the tire, H3 is the distance between the tire and the fender, H4 is the static load radius of the tire, H5 is the suspension height, that is, the distance between the center of the tire and the lower wing surface of the frame, and H6 is the distance between the top of the cab and the lower wing surface of the frame.

[0011] In one implementation of the present application, the step S2 specifically includes: establishing a chassis part height model F1=f(H2, H4, H5), a cab part height model F2=f(H1, H3, H6) and a chassis total height model F0=F1+F2=f(H2, H4, H5)+f(H1+H3+H6).

[0012] In one implementation of the present application, in order to reduce the height of the chassis part, a small radius tire or a method of reducing the distance between the tire center and the lower wing surface H5 of the frame is adopted. The reduction of H5 can be achieved by adopting a large drop front axle, that is, increasing the front axle drop height H9, reducing the suspension pad thickness S and reducing the suspension no-load arc height H8.

[0013] In one implementation of the present application, a priority order for lowering the chassis height is established according to the principle of minimum change, and the priority order is: using a large drop front axle > reducing the thickness S of the suspension pad > reducing the suspension no-load arc height H8 > using a small tire radius.

[0014] In one implementation of the present application, in order to meet the height requirements of the cab portion, a short fender structure is adopted, the cab height positioning is adjusted, or the cab height positioning and engine positioning coordinates are adjusted simultaneously, and the cab height H1 is reduced to achieve partial lowering of the cab.

[0015] In one implementation of the present application, the Z-direction positioning coordinates of the cab or the X and Z-direction coordinates of the cab are adjusted to achieve the height reduction requirement. If the requirement is still not met, the X and Z-direction cab coordinates and the X and Z-direction engine coordinate positioning can be adjusted simultaneously.

[0016] In one implementation of the present application, when the height reduction requirement cannot be achieved by adjusting the coordinates of the cab and the engine, the height of the rear enclosure of the cab is reduced, that is, H1 is reduced to determine whether the height reduction requirement is met.

[0017] In one implementation of the present application, according to the principle of minimum change, a priority order for meeting the cab height requirements is established, using narrow fenders > lowering the cab height in the Z direction > adjusting the cab coordinates in the X+Z direction > simultaneously adjusting the cab and engine coordinates in the X and Z directions > reducing the cab rear enclosure height H1.

[0018] In one implementation of the present application, the height of the truck chassis is greater than the sum of the distance H1 between the top of the cab and the fender and the tire static load radius H2. In the analysis of the chassis and cab end, the priority is from top to bottom, and the same principle is followed for the same level. A single or combined method of the chassis end, the cab end, or the chassis and cab end is used. In the above analysis process, the vehicle layout and component motion verification must be fully considered, and the appropriate method is selected to reduce the height according to the actual situation. The present invention only provides an analysis idea.

[0019] On the other hand, the present application also provides a feasibility analysis system for lowering the height of a truck chassis, characterized in that the system comprises:

[0020] at least one processor; and,

[0021] a memory communicatively connected to the at least one processor; wherein,

[0022] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can complete the aforementioned feasibility analysis method for lowering the chassis height of a truck.

[0023] This application provides a feasibility analysis method and system for lowering the chassis height of a truck. Based on existing models, variable parameters of the chassis and cab are collected, influencing factors are analyzed one by one, and the priority order of implementation factors is established according to the principle of minimum loss. Finally, feasibility analysis can be performed in the form of single variables and combined variables to select the optimal height reduction plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 A flowchart of a feasibility analysis method for lowering the chassis height of a truck provided in an embodiment of the present application;

[0026] Figure 2 A variable exploded diagram of the chassis and cab end provided in an embodiment of the present application;

[0027] Figure 3 A chassis height dimension diagram provided for an embodiment of the present application;

[0028] Figure 4 A schematic diagram of the cab, engine positioning and suspension provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of a feasibility analysis system for lowering the chassis height of a truck provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] The embodiment of the present application provides a feasibility analysis method and system for lowering the chassis height of a truck. The technical solution proposed in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0032] Figure 1 A flowchart of a feasibility analysis method for reducing the height of a truck chassis provided in an embodiment of the present application. Figure 1 As shown, the method mainly includes the following steps:

[0033] Step S1: Collect variable parameters that affect chassis height, and divide the variable parameters into two parts: chassis end and cab end;

[0034] Step S2: Establishing a chassis part, a cab part and a chassis total height function model by collecting variable parameters;

[0035] Step S3: Analyze the variable parameter factors that affect the height model of the chassis and cab part one by one, and establish the priority order of the implementation factors according to the principle of minimum change;

[0036] Step S4: The variable factors of the chassis and the cab are used as a single variable or a combination of variables to reduce the overall height of the chassis.

[0037] In the embodiment of the present application, the variables affecting the total height H of the chassis are mainly collected by analyzing and collecting, and the influencing variable factors are analyzed one by one, and the variable factors are summarized into the chassis part and the cab part. The chassis part, the cab part, and the total height model of the chassis are established through the variable factors. The height model functions of the chassis part and the cab part are analyzed one by one to achieve the chassis height reduction demand. Based on the height reduction demand of existing models, the principle of vehicle motion verification must be met, and after the height reduction, H satisfies the requirement that it is greater than the sum of the distance H1 between the top of the cab and the fender and the static load radius H2 of the tire.

[0038] According to the chassis height reduction requirements and based on the existing vehicle configuration, a feasibility analysis is conducted from the chassis height model. According to the principle of minimum change, the implementation plan priority is to use a large drop front axle > reduce the thickness of the suspension pad S > reduce the suspension no-load arc height H8 > use a small tire radius.

[0039] Based on the feasibility analysis of the cab height model, according to the principle of minimum change, the implementation plan priority is to use narrow fenders > lower the cab height in Z direction > adjust the cab coordinates in X+Z direction > simultaneously adjust the cab and engine coordinates in X and Z directions > reduce the cab rear enclosure height H1.

[0040] In order to meet the demand for lowering the height of the entire vehicle, the height reduction demand can be achieved through a chassis partial implementation plan, a cab partial implementation plan, and a combination of chassis and cab parts.

[0041] In the embodiment of the present application, the variable decomposition diagram of the chassis and the cab end is as follows: Figure 2 As shown, the chassis height dimension diagram is as follows Figure 3 The cab, engine positioning and suspension diagram are shown in Figure 4 The technical solution proposed in this application is described below through specific examples.

[0042] Example 1

[0043] The chassis height of a certain vehicle model is 2120mm, in which the front axle drop H9 is 64mm, and the tire is 6.5R16. According to the above chassis end analysis, when the vehicle configuration remains unchanged, that is, the tire model remains unchanged, the large drop front axle method is preferred, that is, the H9 is an 85mm drop front axle. At this time, when the gap between the tire and the fender meets the movement clearance requirements under the limit state, the total chassis height H=H4+H5+H6, in which H changes from 2120mm to 2099mm by reducing the suspension height H5, that is, H5 is reduced by 21mm (85-64). When the gap between the tire and the fender cannot meet the movement clearance requirements under the limit state, it can be considered to analyze from the cab end, adopt a short fender structure, increase the distance of H3, and judge whether the height reduction requirement is met by increasing H9 and increasing H3 at the chassis end, that is, judge whether the large drop front axle and the cab end adopt a combination of short fender structures to achieve the chassis height reduction requirement. If the requirement is to match the 7.00R16 tire (the radius of the 7.00R16 tire is 12mm larger than that of the 6.50R16 tire), under the principle of satisfying the movement clearance, the thickness S of the suspension pad can be reduced from 30mm to 15mm, so that the unloaded suspension height H5 can be reduced by 15mm. When matching the 7.00R16 tire, the chassis height is 2096mm, and the total chassis height is less than 2100mm.

[0044] Example 2

[0045] A certain vehicle model has a need to be lowered. Its configuration is a chassis height of 2320mm, a cab positioning (*,890,*), a tire model of 6.50R16, a front suspension height H5 of 205mm, and a suspension pad thickness S of 45mm; according to the above analysis sequence.

[0046] First, consider the chassis end variables. To reduce the suspension height H5 from the chassis end, H9 can be increased, that is, a large drop front axle can be used to achieve the reduction of the suspension height. The method is described in Example 1. Assuming that a large drop front axle is used, the clearance H3 between the fender and the tire does not meet the motion clearance requirement. The combination of adjusting the thickness S of the suspension pad and reducing the arc height H8 of the unloaded suspension can be used to determine whether the height reduction requirement is met. That is, the thickness S is adjusted from 45mm to 35mm, and the unloaded arc height H8 of the suspension is reduced by 40mm, that is, the unloaded height of the suspension is reduced by 50mm (45-35+40); the chassis height H is 2285mm. As shown in Table 1 below, adjustment 1.

[0047] W1 W2 H1 H4 H5 H6 H original (*,890,*) (+5,*,0) 1475 350 205 1780 2335 Adjustment 1 155 change 50 2285 Adjustment 2 (*,820,*) (-5,*,0) change 70 10 2215 Adjustment 3 1360 1595 change 115 185 2100 Adjustment (total) (*,830,*) (-5,*,0) 1360 350 155 1595 2100 Change (Total) 70 10 115 / 50 185 235

[0048] Table 1 Decomposition table of height reduction methods for a certain vehicle model

[0049] The cab end variable is adjusted from 890mm to 820mm by lowering the cab Z-direction positioning. To meet the requirements of the movement clearance between the chassis and the cab, the engine positioning is adjusted, the Z-direction height is lowered by 10mm, the Z-direction height is lowered by 70mm, and the chassis height H is 2215mm. (As shown in Table 1, adjustment 2)

[0050] 2.2 Adjust the cab structure, reduce the distance H1 between the cab top and the fender from 1475mm to 1360mm, reduce the height by 115mm, and adjust the height H6 between the lower wing surface of the frame and the cab top from 2285mm to 2100mm. (As shown in Table 1, adjustment 3).

[0051] Through the height reduction analysis of the chassis end and the cab end, a total reduction of 235mm was achieved, changing the chassis height from 2335mm to 2100mm.

[0052] The above is a feasibility analysis method for lowering the height of a truck chassis provided by an embodiment of the present application. Based on the same inventive concept, an embodiment of the present application also provides a feasibility analysis system for lowering the height of a truck chassis. Figure 5 A schematic diagram of a feasibility analysis system for lowering the chassis height of a truck provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the system mainly includes: at least one processor 501; and a memory 502 that is communicatively connected to the at least one processor; wherein the memory 502 stores instructions that can be executed by the at least one processor 501, and the instructions are executed by the at least one processor 501 so that the at least one processor 501 can complete the aforementioned feasibility analysis method for lowering the chassis height of a truck.

[0053] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0054] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0055] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A feasibility analysis method for reducing the height of a truck chassis, characterized in that: The method comprises the following steps: Step S1: Collect variable parameters that affect chassis height, and divide the variable parameters into two parts: chassis end and cab end; Step S2: Establishing a chassis part, a cab part and a chassis total height function model by collecting variable parameters; Step S3: Analyze the variable parameter factors that affect the height model of the chassis and cab part one by one, and establish the priority order of the implementation factors according to the principle of minimum change; Step S4: The variable factors of the chassis and the cab are used as a single variable or a combination of variables to reduce the overall height of the chassis.

2. The feasibility analysis method for lowering the chassis height of a truck according to claim 1, characterized in that: The step S1 specifically includes: collecting variable parameters H, H1, H2, H3, H4, H5, and H6 that affect the total height of the chassis, and dividing the parameters into chassis end part H2, H4, and H5 parameters and cab end part H1, H3, and H6 parameters; wherein H1 is the distance between the top of the cab and the fender, H2 is the static load diameter of the tire, H3 is the distance between the tire and the fender, H4 is the static load radius of the tire, H5 is the suspension height, that is, the distance between the center of the tire and the lower wing surface of the frame, and H6 is the distance between the top of the cab and the lower wing surface of the frame.

3. The feasibility analysis method for lowering the chassis height of a truck according to claim 1, characterized in that: The step S2 specifically includes: establishing a chassis part height model F1=f(H2, H4, H5), a cab part height model F2=f(H1, H3, H6) and a chassis total height model F0=F1+F2=f(H2, H4, H5)+f(H1+H3+H6).

4. The feasibility analysis method for lowering the chassis height of a truck according to claim 3 is characterized in that: In order to reduce the height of the chassis, small radius tires or reducing the distance between the tire center and the lower wing surface H5 of the frame are adopted. Reducing H5 can be achieved by adopting a large drop front axle, that is, increasing the front axle drop height H9, reducing the suspension pad thickness S and reducing the suspension no-load arc height H8.

5. The feasibility analysis method for lowering the chassis height of a truck according to claim 4, characterized in that: According to the principle of minimum change, the priority order for lowering the chassis height is established, and the priority order is: using a large-drop front axle > reducing the thickness S of the suspension pad > reducing the suspension no-load arc height H8 > using a small tire radius.

6. The feasibility analysis method for lowering the chassis height of a truck according to claim 3 is characterized in that: In order to meet the height requirements of the cab portion, a short fender structure is adopted, the cab height positioning is adjusted, or the cab height positioning and engine positioning coordinates are adjusted simultaneously, and the cab height H1 is reduced to achieve partial lowering of the cab.

7. The feasibility analysis method for lowering the chassis height of a truck according to claim 6, characterized in that: Adjust the cab Z-direction positioning coordinates or the cab X and Z-direction coordinates to achieve the height reduction requirement. If the requirement is still not met, adjust the cab X and Z-direction coordinates and the engine X and Z-direction coordinate positioning at the same time.

8. The feasibility analysis method for lowering the chassis height of a truck according to claim 6, characterized in that: When adjusting the cab and engine coordinates cannot achieve the height reduction requirement, the rear height of the cab is reduced, that is, H1 is reduced to determine whether the height reduction requirement is met.

9. The feasibility analysis method for lowering the chassis height of a truck according to claim 6, characterized in that: According to the principle of minimum change, a priority order for meeting the cab height requirements is established: using narrow fenders > lowering the cab height in the Z direction > adjusting the cab coordinates in the X+Z direction > simultaneously adjusting the cab and engine coordinates in the X and Z directions > reducing the cab rear enclosure height H1.

10. A feasibility analysis system for lowering the chassis height of a truck, characterized in that: The system comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can complete the feasibility analysis method for lowering the chassis height of a truck as described in any one of claims 1-9.

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