Fatigue and vibration test bench for car seats

Complete Car Seat Vibration and Fatigue Test Bench

Car seat testing is an important part of automotive component testing. Seat loading vibration testing is a process that simulates the actual testing environment, providing real-world theoretical data for automotive manufacturing. . Vibration is an important factor affecting the lifespan of car seats. During car operation, the car will mainly produce vertical and horizontal vibration relative to the ground due to road conditions, starting, braking and other working conditions; the car seats will produce the same vibration. At the same time, drivers and passengers sitting on the seats will also produce composite external forces on the seats due to vibration inertia.
In existing technology, there is a test bench that meets therequirements of the vibration test of automobile seats which simulates composite external forces. This test bench has relatively complete functionality and can meet testing needs; hHowever, the accessories of the existing automobile seat test bench that simulates composite external forces are numerous, complex structures, high costs, low precision, and difficult to maintain; and due to cost issues, it is difficult to popularize and apply them in small and medium-sized businesses. However, the test bench with simple structure and low cost can only realize vibration in one direction and cannot realize compound vibration at the same time. It cannot achieve the simulated compound external force vibration experiment required by the car seat.
Therefore, there is a need for a device for detecting fatigue due to the vibrations of a car seat, capable to vibrate the seat in one direction as needed, and also able to perform composite external force vibration, with simple structure, easy operation and low production cost. .

Contents of the invention
In view of this, the purpose of the present invention is to provide a complete fatigue vibration test bench for automobile seat, which can realize seat vibration in one direction as needed, and also it can carry out composite external force vibration, has simple structure, convenient operation and low production cost.
The automobile seat overall fatigue vibration test bench of the present invention comprises a base, a seat installation platform, a horizontal vibration device, a vertical vibration device and a hip simulation device;
The horizontal vibration device includes a lineOn the right, a horizontal carriage with guide rails fixed on the base and a horizontal vibration motor used to drive the horizontal carriage to reciprocate along the linear guide rail;
The vertical vibration includes a vertical vibration motor and a vertical guide rod. The straight vibration motor shell is fixed on the horizontal carriage, and the rotor shaft drives the seat installation platform to reciprocate up and down;
The hip simulation device includes a bracket, a rocker arm, a fake hip rotation motor and a fake hip, and the bracket is fixed. Placed on the base, the rocker arm is articulated on the support with a single degree of freedom so as to be able to oscillate in the vertical plane. The hip false rotation motor housing is fixedly installed on the free end of the rocker arm. Rotor shaftextends downward and is connected to the false hip by transmission. , the false buttocks face the car seat to be tested on the seat installation platform.
In addition, the horizontal vibration motor drives the horizontal carriage to reciprocate along the linear guide rail through the pair of horizontal screws. The screw of the horizontal screw pair is driven by the rotor shaft of the horizontal vibration motor, and the nut of the horizontal screw pair is fixed. Installed on the horizontal carriage; the vertical vibration motor passes through the vertical screw auxiliary drive base. The chair installation platform reciprocates up and down, the screw rod of the pair of vertical screw rods is driven and matched with the rotor shaft of the vertical vibration motor, and the nut of the pair of vertical screw rods is fixedly connected to thea seat installation platform; [0011] In addition, at least three guide rods are distributed in a polygonal shape, the lower end is fixed on the horizontal drag plate, and the upper end passes through the seat installation platform in a sliding manner back and forth; the outer circle of the guide rod is covered with a compression spring, and the lower end of the compression spring resists the horizontal drag plate. The upper surface of the board, the upper end resists the lower surface of the seat installation platform;
In addition, the bracket is provided with three swing arms side by side on the horizontal plane in one direction perpendicular to the swing arm, and a dummy arm is provided at the end of each swing arm. Hip rotation motor and artificial hip; the rocker arms located on either side are respectively articulated to the support thanks to theour corresponding rocker arm seats, and the two rocker arm seats are arranged on the support so as to be able to slide on the horizontal plane in a direction perpendicular to the rocker arm.
In addition, the two rocker arm seats are respectively driven in reciprocating movement along the support by a screw mechanism. The screw rods of the screw mechanisms of the two rocker arm seats are integrally fitted in the circumferential direction and the direction of rotation of the thread is opposite, and the bracket is provided with a handle which is integrally fitted to the threaded rod of any mechanism screw in the circumferential direction;
In addition, the rocker arm uses the hinge point as a fulcrum to form a lever structure, and the rocker arm is installed falsely. The gravitational moment of the moment arm at one end of the hip is greater than the gravitational moment of the moment arm at one end of the hip. moment ofu moment arm at the other end;
Furthermore, the rocker arm is hinged at the hinge point through a downwardly fixed bracket.rod;
Furthermore, the engine horizontal vibration, the control circuits of the vertical vibration motor and the hip false rotation motor are all electrically connected to the control box, and the control box is disposed in the cavity at the bottom of the support.
The beneficial effects of the present invention are as follows: the complete fatigue vibration test bench for car seat of the present invention adopts a horizontal and vertical composite vibration structure, combined with a device for simulating the prosthetic buttocks of the driver and passenger, and each has an independent drive mechanism that can vibrate the seat in a single direction as needed to achieve a single seat fatigue setting; it can alsontrain composite external force vibrations at the same time to perform sine wave vibration test to obtain the overall vibration of the seat. Fatigue Parameters: Since the present invention has only a few components, it has a simple structure and is easy to disassemble. and assemble, is convenient to use and can reduce production and use costs.

Detailed Embodiments
Figure 1 is a schematic structural diagram of the present invention, and Figure 2 is a schematic diagram along direction A of Figure 1. As shown shows the figure: the all-round fatigue vibration of the car seat in this embodiment. The test bench includes a base 7, a seat installation platform 2, a horizontal vibration device, a vertical vibration device and a hip simulation device;
The horizontal vibration device includes ahorizontal carriage 11 placed on the base 7 via a linear guide rail Ila and a horizontal vibration motor 8 used to drive the horizontal carriage 11 to reciprocate along the guide rail linear;
The vertical vibration device comprises a vertical vibration motor 5 and a vertically arranged guide rod 13, and the vertical vibration motor housing 5. Fixedly arranged on the horizontal carriage 11, such as the shows the figure, the housing of the vertical vibration motor 5 is fixed on the lower part of the horizontal carriage 11, and the rotor axis of the vertical vibration motor 5 rotates upward to pass through. The horizontal carriage 11 drives the seat installation platform 2 for reciprocating movement up and down;
The hip simulation device includes a support 14, a rocker arm 19, a motor false hip rotation 21 and a false hreed 20. The support 14 is fixedly installed on the base 7; the rocker arm 19 is articulated on the support 14 with a single degree of freedom in a pivoting manner in the vertical plane. As shown in the figure, the rocker arm 19 is hinged at the hinge point via the hinge shaft 18, and the hip false rotation motor housing 21 fixedly disposed on the free end of the rocker arm 19, the rotor shaft of the false hip rotation motor 21 extends downward and is connected to the false hip 20 by transmission. As shown in the figure, the false hip 20 is connected to the rotor shaft of the false hip rotation motor 21 via the false hip co.connecting rod 22; The hip 20 faces the car seat to be tested on the seat installation platform 2.

In this embodiment, the horizontal vibration motor 8 drives the horizontal carriage 11 so that it performs a back and forth movement along theIla linear guide rail through the pair of horizontal screws. The screw 9 of the horizontal screw pair and the horizontal vibration motor 8 cooperate with the rotor shaft transmission, as shown in the figure, the screw rod 9 is adjusted horizontally; the nut 10 of the pair of horizontal screws is fixedly fixed on the horizontal carriage 11; the vertical vibration motor 5 drives the seat installation platform 2 up and down through the pair of vertical screws. Reciprocating movement, the screw 4 of the vertical screw pair is driven and matched with the rotor shaft of the vertical vibration motor 5, and the nut 3 of the vertical screw pair is fixedly connected to the plate -seat installation form 2. As shown in the figure, the screw 4 is extended upwards, the nut 3 is fixedly fixed on the lower end of the hollow bracket which is fixedly connected to the seat installation platform 2 andend down; It adopts horizontal screw pair structure and vertical screw pair structure, the structure is simple and compact, can be transmitted accurately, and can meet different amplitude requirements. Accurate vibration testing under high conditions and facilitate vibration data collection.
In this embodiment, there are at least three guide rods 13 distributed in a polygonal shape. The lower end is fixedly arranged on the horizontal carriage 11, and the upper end passes through the seat installation platform 2 in a reciprocating sliding manner. In this embodiment, for example four guide rods 13 are used and are distributed in a rectangular shape; the outer circle of the guide rod 13 is covered with a compression spring 12, the lower end of the compression spring 12 resists the upper surface of the horizontal carriage 11, and the outerupper remite resists the lower surface of the seat installation plateform 2; When the vertical vibrating table moves, the compression spring is installed to ensure the smoothness of the movement and reduce the impact and noise of the movement.
In this embodiment, the support 14 is provided with three rocker arms (rocker 19, rocker 191 and rocker 192 respectively in the figure) parallel in the direction perpendicular to the rocker 19 on the horizontal plane. A false hip rotation motor 21 and a false hip 20 are respectively provided at the end of each rocker arm; the rocker arms located on either side (rocker arms 19 and rocker arms 192 respectively in the figure) pass through their corresponding rocker arm seats (respectively in the figure rocker arm seat 17 and rocker arm seat 17a) are articulated to the support 14. shown in the figure, the rocker arm 19 is articulated on the rocker arm seat 17, the rocker armtor 192 is hinged on the rocker seat 17a; rocker arm seat 17 and rocker arm seat 17a It is arranged on the support 14 so as to be able to slide on the horizontal plane in the direction perpendicular to the rocker arm. As shown in the figure, the support 14 is provided with a chute along the transverse direction of the rocker arm. The upper end of the rocker arm base 17 and the rocker arm base 17a are mounted on the horizontal boss and the rocker arm base 17 together with the rocker arm seat 17a are inserted downwardly into the chute in a sliding manner. back and forth. The bosses of the rocker seat 17 and the rocker seat 17a bear on the support 14 through the triangular slide 16 and the triangular slide 16a; three are provided. The rocker arm can be applied to conventional three-seater seats, making the invention very versatile; since the rocker arms located on both sides can slide back and forthrear relative to the support, this can simulate the impact of the driver\'s left and right movement on the seat. At the same time, thanks to the adjustment, it can be applied to seats of different widths and positioned precisely, increasing the versatility of the present invention.
In this embodiment, the two rocker arm seats (rocker arm seat 17 and rocker arm seat 17a) are driven by a screw mechanism to reciprocate along the support 14. The threaded rods of the two seats of rocker arms The threaded rods of the mechanisms are fixedly fitted in the circumferential direction and the directions of rotation of the thread are opposite. As shown in the figure, the screw rod 15 and the screw rod 1¾ are fixedly fitted in the circumferential direction through the flange 25, and the nut 23 is fixedly provided on the rocker arm seat 17. screw rod 15 and nut 23 cooperate to form a ti mechanismthreaded ge. The nut 23a is fixedly arranged on the rocker arm seat 17a. The threaded rod 15a and the nut 23a cooperate to form another threaded rod mechanism. The directions of rotation of the thread of the threaded rod 15 and the threaded rod 1¾ are opposite; Thus, the support 14 is provided with a handle M which is fixedly attached to the screw of any screw mechanism.sm in the circumferential direction. As shown in the figure, the handle M is integral with the screw 15 in the circumferential direction; it can more accurately adjust the fake hips on both sides. The relative distance allows three seats with different spacings to be detected.
In this embodiment, the rocker arms (rocker arm 19, rocker arm 191 and rocker arm 192) form a lever structure with the articulation point as a fulcrum. The moment of gravity of the force arm at one end of the rocker arm is greater than the force at the other end. The gravitational moment ofu arm; a certain counterweight is formed through the lever structure, so that the artificial hip acts on the seat to better simulate the effect of a real person.
In this embodiment, the rocker arms (rocker arm 19, rocker arm 191 and rocker arm 192) are fixed downwards via support rods (support rods 19a, 191a and 192a respectively in the figure). ) is hinged at the point of articulation; It is beneficial to increase the swing freedom of the rocker arm and avoid motion interference during experiments.

In this embodiment, the control circuits of the horizontal vibration motor 8, the vertical vibration motor 5 and the false hip rotation motor 21 are all electrically connected to the control box 6, which is arranged at the bottom. part of the support. inside the cavity.
When the present invention is used, the horizontal vibration motor drives the platehorizontal support, drives the vertical vibration device and drives the seat installation platform to vibrate horizontally. At the same time, the vertical vibration motor drives the seat installation platform to vibrate horizontally. Vertical vibrations. At the same time, when the seat vibrates vertically, the artificial hip is made to swing up and down with the hinge point as the center of the circle, simulating the driver\'s impact on the seat when it vibrates. At the same time, the rotation motor of the artificial hip drives the artificial hip. The hip rotates around the vertical axis, causing the seat to vibrate and rub as it rotates and swings back and forth; thereby simulating the vibration caused by the composite force during actual use.

Finally, it should be noted that the above embodiments are only used to illustrate the solutions tetechnical aspects of the present invention and are not limiting. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that the technical solutions of the present invention may be modified. Equivalent substitutions, without departing from the spirit and scope of the technical solution of the present invention, will be covered by the claims of the present invention.

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