A method for modeling a link model of a car door lock body

Abstract

The present invention discloses a modeling method for a car door lock body link model, which includes the following steps: 1) according to the three-dimensional model of the car door lock body mechanism, the lock body transmission mechanism is decomposed into multiple single link mechanisms; 2) the lock body transmission mechanism is decomposed into multiple series combination modules or parallel combination modules of transmission and connection forms composed of two related components; 3) displacement analysis between the two components is performed to obtain the displacement constraint relationship between the two components; 4) error analysis is performed on the displacement constraint relationship between the two components in step 3); 5) load analysis between the two components is performed; 6) inertia resistance analysis between the two components is performed; 7) the modules that have completed the analysis are combined according to the lock body link diagram to obtain the lock body link model. The model of the present invention can quickly obtain the key parameter indicators required for the theoretical analysis of the lock body actuation characteristics, which can save the time and economic cost of repeatedly trial-producing samples and performing performance tests in the lock body development process.

Description

Technical Field

[0001] The invention relates to a vehicle door lock design technology, and in particular to a modeling method for a vehicle door lock body link model. Background Art

[0002] The car door lock is a special part of the car that combines safety, decoration and craftsmanship. The acceleration generated when the car is hit may cause the door lock body to move due to inertia and be unlocked. Inertia resistance means that the car will withstand a certain acceleration when the collision occurs, and at this time, it is necessary to ensure that the lock body is not unlocked and the door is opened. The existing technology requires that the car door lock is guaranteed not to be unlocked when subjected to an acceleration of 30g.

[0003] During the development of the lock body, after designing the 3D model, it is necessary to trial-produce samples in small batches and conduct various performance tests. The durability test takes a long time, and the inertia resistance test requires a real vehicle collision test, which is extremely costly. If the lock body does not meet the performance requirements after the test, the 3D model needs to be modified and the trial production and testing steps need to be repeated, which greatly increases the time and economic cost. The analysis of various actuation characteristics based on the 3D model of the lock body is relatively independent and lacks systematic analysis. In addition, when the 3D model is significantly modified, the process and results of the previous analysis are no longer applicable. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for modeling a link model of a car door lock body in view of the defects in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for modeling a link model of a car door lock body, comprising the following steps:

[0006] 1) According to the three-dimensional model of the lock body mechanism of the automobile door lock, a three-dimensional model of the lock body transmission mechanism is obtained, and the lock body transmission mechanism is decomposed into multiple single-link mechanisms based on the different functions of the lock body transmission mechanism as the distinguishing conditions; the functions of the lock body transmission mechanism include inner locking, outer locking, electric control locking, inner opening and outer opening; the single-link mechanism includes inner locking kinematic chain, electric control locking kinematic chain, outer locking kinematic chain, inner opening kinematic chain and outer opening kinematic chain;

[0007] 2) Based on the functions of each link and the transmission and connection forms between components in the lock body transmission mechanism, a lock body link diagram is obtained, and the lock body transmission mechanism is decomposed into a plurality of serial combination modules or parallel combination modules of transmission and connection forms composed of two related components;

[0008] The transmission and connection forms include parallel axis transmission, intersecting axis transmission and articulation;

[0009] 3) According to different transmission and connection forms, for each series combination module or parallel combination module composed of two associated components, the displacement analysis between the two components is performed to obtain the displacement constraint relationship between the two components. The displacement input by one component can be used to obtain the displacement output by the other component and the contact point position between the two components at this time;

[0010] 4) Perform error analysis on the displacement constraint relationship between the two components in step 3), and map various errors affecting the displacement output of the series combination module or parallel combination module composed of the two associated components to the key structural parameters in the module;

[0011] Modify the displacement constraint relationship between the two components according to the results of error analysis;

[0012] Among them, the key parameters include the component rotation axis equation and the contact surface equation

[0013] The specific steps of error analysis are as follows:

[0014] 4.1) Analyze the sources of lock body errors and classify them according to their impact on key structural parameters;

[0015] 4.2) Establish the mapping relationship between various errors and key structural parameters and determine the error range;

[0016] 4.3) By randomly selecting values ​​within each error range, the angular displacement of the latch is obtained according to the lock body link model to determine the influence of each error value on the angular displacement of the latch;

[0017] 5) For each series combination module or parallel combination module consisting of two associated components, perform load analysis between the two components;

[0018] Determine the force point and direction of the interaction force according to the contact point between the two components. Calculate the friction force, torsion spring torque and torque balance to obtain the interaction force between the two components and the input load, and perform load analysis on the module.

[0019] 6) For each series combination module or parallel combination module composed of two associated components, perform inertia resistance analysis between the two components;

[0020] Obtain the center of mass position and mass of each component, and calculate the module's inertia resistance based on the value, direction and action time of the impact inertia load;

[0021] 7) Combine the series combination modules or parallel combination modules composed of the two related components that have completed the analysis according to the lock body link diagram to obtain the lock body link model;

[0022] By constructing the lock body link model, based on the received displacement input from the active components of each link, the displacement generated by the remaining components in each link, the load borne by each component, and the relationship curve between the input displacement and the input load can be obtained; based on the received impact inertia load, the kinetic energy generated by each component and the total kinetic energy of the lock body mechanism can be obtained.

[0023] The beneficial effects produced by the present invention are:

[0024] 1. The present invention proposes a method for modeling a link of a car door lock body. Compared with the existing method, after the three-dimensional model is optimized, it is only necessary to modify the key structural parameters in the lock body link model, increase or decrease or change the module connection sequence, and establish an optimized lock body link model. The key parameter indicators required for the theoretical analysis of the lock body actuation characteristics can be quickly obtained without the need to completely re-analyze the lock body actuation characteristics. At the same time, it can also save the time and economic cost of repeatedly trial-producing samples and performing performance tests in the lock body development process.

[0025] 2. The key parameter indicators obtained by the method of the present invention can provide a theoretical basis for the design and optimization of key structural parameters in the three-dimensional model of the lock body mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 is a method flow chart of an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of a transmission mechanism of a car door lock body according to an embodiment of the present invention;

[0029] Figure 3 is a functional classification diagram of the automobile door lock body of an embodiment of the present invention;

[0030] Figure 4 is a diagram illustrating a lock body link diagram of an embodiment of the present invention;

[0031] Figure 5 This is a link diagram of the automobile door lock body of an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of a lock body link model according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] like Figure 1As shown, a method for modeling a link model of a car door lock body comprises the following steps:

[0035] 1) Based on the 3D model of the car door lock body mechanism, the 3D model of the lock body transmission mechanism is obtained. Based on the different functions of the lock body transmission mechanism as the distinguishing conditions, the lock body transmission mechanism is decomposed into multiple single-link mechanisms;

[0036] The functions of the lock body transmission mechanism include internal locking, external locking, electric control locking, internal opening and external opening;

[0037] The single-link mechanism includes an inner locking kinematic chain, an electrically controlled locking kinematic chain, an outer locking kinematic chain, an inner opening kinematic chain and an outer opening kinematic chain;

[0038] like Figure 2 As shown, in this embodiment, according to the multi-link analysis method, combined with the functional characteristics of the lock body, the lock body function is divided into two types of functions: locking and locking, and the lock body mechanism is decomposed into five single-link mechanisms, such as Figure 3 shown.

[0039] After the lock body links are classified, the transmission and connection forms between the components of each link are analyzed in turn.

[0040] 2) Based on the functions of each link and the transmission and connection forms between components in the lock body transmission mechanism, a lock body link diagram is obtained, and the lock body transmission mechanism is decomposed into a plurality of serial combination modules or parallel combination modules of transmission and connection forms composed of two related components;

[0041] The lock body link diagram is a function-based lock body structure diagram, and different legends and definitions are proposed, such as Figure 4 Based on the functions of each link and the transmission and connection forms between components, a lock body link diagram is drawn, and the lock body mechanism is decomposed into a series and parallel combination of modules with different transmission and connection forms between two components, as shown in Figure 1. Figure 5 shown.

[0042] The transmission and connection forms include parallel axis transmission, intersecting axis transmission and articulation;

[0043] Such as gear mechanism, helical gear mechanism and connecting rod mechanism.

[0044] 3) According to different transmission and connection forms, for each series combination module or parallel combination module composed of two associated components, the displacement analysis between the two components is performed to obtain the displacement constraint relationship between the two components. The displacement input by one component can be used to obtain the displacement output by the other component and the contact point position between the two components at this time;

[0045] 4) Perform error analysis on the displacement constraint relationship between the two components in step 3), and map various errors affecting the displacement output of the series combination module or parallel combination module composed of the two associated components to the key structural parameters in the module;

[0046] Modify the displacement constraint relationship between the two components according to the results of error analysis;

[0047] Among them, the key structural parameters include the component rotation axis equation and the contact surface equation

[0048] The deformation of each component can be considered in error analysis and load analysis, so each component is treated as a rigid body for theoretical analysis; the specific steps of error analysis are as follows:

[0049] The specific steps of error analysis are as follows:

[0050] 4.1) Analyze the sources of lock body errors and classify them according to their impact on key structural parameters;

[0051] 4.2) Establish the mapping relationship between various errors and key structural parameters and determine the error range;

[0052] 4.3) By randomly selecting values ​​within each error range, the angular displacement of the latch is obtained according to the lock body link model to determine the influence of each error value on the angular displacement of the latch;

[0053] 5) For each series combination module or parallel combination module consisting of two associated components, perform load analysis between the two components;

[0054] Determine the force point and direction of the interaction force according to the contact point between the two components. Calculate the friction force, torsion spring torque and torque balance to obtain the interaction force between the two components and the input load, and perform load analysis on the module.

[0055] After inputting any displacement into the module, each component is in a state of force balance and moment balance, where the torsion spring moment can be calculated based on the torsion spring moment calculation formula and the component angular displacement; the interaction force can be decomposed into the pressure along the normal vector direction of the contact point and the friction along the tangent plane direction. The friction between the two components can be calculated using the existing static friction model, dynamic friction model or the friction calculation model improved therefrom. The length of the lever arm is obtained based on the contact point position and the pressure direction between the components, and the relationship between the input load of the active component and the load transmitted to the driven component is obtained through the moment balance calculation;

[0056] 6) For each series combination module or parallel combination module composed of two associated components, perform inertia resistance analysis between the two components;

[0057] Obtain the center of mass position and mass of each component, and calculate the module's inertia resistance based on the value, direction and action time of the impact inertia load;

[0058] 7) The series combination modules or parallel combination modules composed of the two related components that have been analyzed are combined according to the lock body link diagram to obtain the lock body link model; the constructed car door lock body link model is as follows Figure 6 shown.

[0059] By constructing the lock body link model, based on the received displacement input from the active components of each link, the displacement generated by the remaining components in each link, the load borne by each component, and the relationship curve between the input displacement and the input load can be obtained; based on the received impact inertia load, the kinetic energy generated by each component and the total kinetic energy of the lock body mechanism can be obtained.

[0060] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A method for modeling a link model of a car door lock body, characterized in that: The following steps are involved: 1) According to the three-dimensional model of the lock body mechanism of the automobile door lock, a three-dimensional model of the lock body transmission mechanism is obtained, and the lock body transmission mechanism is decomposed into multiple single-link mechanisms based on the different functions of the lock body transmission mechanism as the distinguishing conditions; the functions of the lock body transmission mechanism include inner locking, outer locking, electric control locking, inner opening and outer opening; the single-link mechanism includes inner locking kinematic chain, electric control locking kinematic chain, outer locking kinematic chain, inner opening kinematic chain and outer opening kinematic chain; 2) Based on the functions of each single-link mechanism and the transmission and connection forms between components in the lock body transmission mechanism, a lock body link diagram is obtained, and the lock body transmission mechanism is decomposed into a series combination module or a parallel combination module of transmission and connection forms composed of multiple related two components; 3) According to different transmission and connection forms, for each series combination module or parallel combination module composed of two associated components, the displacement analysis between the two components is performed to obtain the displacement constraint relationship between the two components. The displacement input by one component can be used to obtain the displacement output by the other component and the contact point position between the two components at this time; 4) Perform error analysis on the displacement constraint relationship between the two components in step 3). The specific steps of error analysis are as follows: 4.1) Analyze the sources of lock body errors and classify them according to their impact on key structural parameters; 4.2) Establish the mapping relationship between various errors and key structural parameters and determine the error range; 4.3) By randomly selecting values ​​within each error range, the angular displacement of the latch is obtained according to the lock body link model to determine the influence of each error value on the angular displacement of the latch; Mapping various errors affecting the displacement output of the series combination module or the parallel combination module composed of the two associated components to key structural parameters in the series combination module or the parallel combination module; Modify the displacement constraint relationship between the two components according to the results of error analysis; Among them, the key structural parameters include the component rotation axis equation and the contact surface equation; 5) For each series combination module or parallel combination module consisting of two associated components, perform load analysis between the two components; 6) For each series combination module or parallel combination module composed of two associated components, perform inertia resistance analysis between the two components; 7) The series combination modules or parallel combination modules composed of the two related components that complete the load analysis and the inertia resistance analysis are combined according to the lock body link diagram to obtain the lock body link model.

2. A method for modeling a link model of a car door lock body according to claim 1, characterized in that: In the step 2), the transmission and connection forms include parallel axis transmission, intersecting axis transmission and articulation.

3. The method for modeling a link model of a car door lock body according to claim 1, characterized in that: In step 5), the load analysis is as follows: The force point and direction of the interaction force are determined according to the position of the contact point between the two components. The interaction force between the two components and the size of the input load are obtained based on the friction force calculation, torsion spring torque calculation and torque balance calculation, and the load analysis of the module is performed.

4. The method for modeling a link model of a car door lock body according to claim 1, characterized in that: In step 6), the inertia resistance analysis is as follows: The center of mass position and mass of each component are obtained, and the module's inertia resistance is calculated based on the value, direction and action time of the impact inertia load.

5. The method for modeling a link model of a car door lock body according to claim 1, characterized in that: In the step 7), a lock body link model is obtained. Through the constructed lock body link model, the displacement generated by the remaining components in each link, the load received by each component, and the relationship curve between the input displacement and the input load can be obtained according to the received impact inertia load. The kinetic energy generated by each component and the total kinetic energy of the lock body mechanism are obtained according to the received impact inertia load.

6. An electronic device, characterized in that: include: one or more processors; as well as a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors are caused to execute the method according to any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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