New energy automobile chassis control arm static tensile strength test device

Abstract

The utility model relates to the field of new energy automobile chassis, and discloses a new energy automobile chassis control arm static tensile strength test device, which comprises a gantry upright post, an oil cylinder (with a force sensor), a gantry frame, a spring, a control arm body and a hydraulic power system, the oil cylinder with the force sensor is composed of a knuckle bearing lug, a knuckle bearing ball, a knuckle bearing, an oil cylinder body, a piston rod, the force sensor, a threaded fastener and a connecting fork rod. The control arm part is composed of a connecting block, a control arm body and a support. According to the utility model, the limit stress condition and durability of the control arm in a real vehicle state can be simulated, the rigidity influence of different material levels or single / double-plate type control arms can be evaluated, the verification accuracy of a bench test is high, and the lightweight design and development of each part of a chassis suspension can be guided.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicle chassis, and in particular to a static tensile strength test device for a new energy vehicle chassis control arm. Background Art

[0002] Under the pressure of automobile lightweighting and energy conservation and emission reduction, the use of high-strength steel to replace ordinary strength steel is a trend in the development of modern automobile parts. Against the background of increasingly severe global energy demand and environmental pollution pressure, reducing automobile energy consumption and reducing emissions have become one of the main problems facing the automotive industry. The automobile chassis system accounts for about 25% of the weight of the whole vehicle. The lightweight design of the suspension system involves structural properties such as part strength, deformation and modal frequency, which directly affects the ride smoothness and handling stability of the vehicle. The lightweight design is difficult and the material strength level is low. According to the survey, the maximum strength of the chassis suspension system materials of most independent brand passenger car companies is still 600MPa or even 400MPa, which is significantly behind imported and joint venture brand models, and the demand for high suspension reinforcement is obvious.

[0003] In order to meet the needs of industry users for upgrading the strength of suspension materials, the application optimization design and evaluation analysis of 800 / 1000MPa ultra-high strength steel is completed for key components, and the material selection capability of chassis suspension design optimization technology is provided to users to meet the standard requirements of the main engine factory. To this end, it is necessary to establish a set of static tensile strength test devices for testing control arms of different strength levels. However, for the bench test of automobile control arms, most of them are connected to the subframe, and the subframe is connected to the base to carry out the test. During the test, the influence of the subframe's own strength and the stiffness of the subframe's connection base cannot be avoided. If the strength of the subframe is insufficient during the test, it will fail prematurely, resulting in the invalidity of the control arm test. At the same time, the original bench occupies a large area, and the price of the fixture processing is high. If the device is tested with a subframe, it can only correspond one to one, which has great limitations and poor compatibility. Therefore, it is not possible to well exclude the influence of the stiffness of the subframe and the base itself on the control arm itself, and it is also impossible to verify the influence of control arms with different material grades on the overall suspension. Utility Model Content

[0004] The utility model aims to provide a static tensile strength test device for a chassis control arm of a new energy vehicle, so as to solve the problem that the prior art cannot well eliminate the influence of the stiffness of the subframe and the base itself on the control arm itself, and cannot verify the influence of the control arm with different material grades on the overall suspension.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a static tensile strength test device for chassis control arm of new energy vehicle, comprising:

[0006] A support for vertically positioning and clamping the control arm so that the steering tie rod connection end of the control arm is located at the top;

[0007] A linear telescopic member for applying a load to the control arm, the linear telescopic member comprising a fixed end and a telescopic end;

[0008] The fixed end of the linear telescopic member is rotatably connected to a support member, the telescopic end of the linear telescopic member is vertically rotatably connected to the steering rod connecting end of the control arm, the telescopic end of the linear telescopic member is connected to a force sensor, a support frame is provided above the linear telescopic member, and an elastic member is connected between the support frame and the linear telescopic member.

[0009] This solution can simulate the ultimate stress conditions and durability of the control arm under actual vehicle conditions, evaluate the stiffness effects of different material levels or single / double-piece control arms, and the bench test verification has high accuracy, thereby guiding the lightweight design and development of various chassis suspension components.

[0010] Preferably, as an improvement, the telescopic end of the linear telescopic member is connected to a connecting fork rod via a threaded fastener, the connecting fork rod is connected to a connecting block via a pin shaft, and the connecting block is connected to the control arm at the same connection position as the automobile steering rod.

[0011] Preferably, as an improvement, the linear telescopic member is an oil cylinder or a pneumatic cylinder.

[0012] Preferably, as an improvement, the support member is a gantry column, a bearing ear seat is fixed on the gantry column, a bearing ear seat is provided on the bearing ear seat, and a bearing ball is provided on the fixed end of the linear telescopic member. A joint bearing rotatably connected to the bearing ball is provided.

[0013] Preferably, as an improvement, the support frame is a gantry frame, and the elastic member is a spring connected between the gantry frame and the fixed end of the linear telescopic member.

[0014] Preferably, as an improvement, the axis center of the connection between the connecting fork rod and the connecting block corresponds to the ball center of the control arm connected to the steering rod ball joint when the control arm is actually used.

[0015] Preferably, as an improvement, the pin connecting the connecting fork rod and the connecting block is arranged transversely, so that the connecting fork rod can rotate vertically relative to the connecting block.

[0016] The principle and advantages of this scheme are: in actual application, the gantry column mainly plays the role of supporting the oil cylinder to avoid deformation of the tooling due to excessive force. The linear telescopic member is used to provide a certain load through the power system, such as the oil cylinder adopts a hydraulic power system, the cylinder adopts a pneumatic power system, etc., which is used to test the relevant performance parameters of the longitudinal or lateral static tensile strength of the control arm. There is a force sensor at the front end of the linear telescopic member to monitor the magnitude of the force. When a certain load is set, if the load provided by the power system does not meet the requirements, the force sensor will feedback to the power system and continue to apply the load until the requirements are met. The force sensor is installed at the front end of the telescopic end of the linear telescopic member to facilitate more accurate sensing of the magnitude of the force. The threaded fastener is used to connect the telescopic end of the linear telescopic member with the connecting fork rod to prevent it from falling off when the load is too large. The connecting block is used to simulate the actual ball joint joint. The axis connected to the connecting fork rod corresponds to the ball center of the actual ball joint to ensure that the position of the control arm under force is consistent with the limit force condition under the actual vehicle state. The connecting fork rod and the connecting block can rotate up and down around the movable bolt. On the one hand, it can be used to adjust the camber angle, and on the other hand, it can avoid interference in the force application process. During the test, as the force increases, the connecting fork can rotate freely on the movable bolt axis, compensating for the deformation of the control arm body. The gantry mainly plays the role of support and guidance positioning. The linear telescopic part is connected to the gantry bracket through a spring, so that when the force is applied, the movement of the telescopic end of the linear telescopic part is consistent with the deformation of the control arm body during the test, avoiding interference.

[0017] Such a test device can clamp the control arm separately for testing, which effectively avoids the influence of the subframe's own strength and the stiffness of the subframe connection base on the static tensile strength test of the control arm. It does not need to prepare a subframe and related clamping equipment, occupies a small space, is not limited by the type of subframe, is applicable to various types of control arms, and has high compatibility and versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The figure marks in the drawings of the specification include: gantry column 1, bearing ear seat 2, joint ball bearing 3, cylinder 4, gantry 5, spring 6, piston rod 7, force sensor 8, threaded fastener 9, connecting fork rod 10, connecting block 11, control arm 12, ear plate clamp seat 13, support 14.

[0021] The embodiment is basically as shown in the attached Figure 1As shown: a static tensile strength test device for a chassis control arm of a new energy vehicle, comprising a support 14 for vertically positioning and clamping a control arm 12, two ear plate clamp seats 13 with axes perpendicular to each other are provided on the support 14 corresponding to the connection points between the control arm 12 and the subframe, and the control arm 12 is connected to the two ear plate clamp seats 13 through a pin shaft so that the steering rod connecting end of the control arm 12 is located at the top.

[0022] It also includes a linear telescopic member for applying a load to the control arm 12. In this embodiment, the linear telescopic member adopts a cylinder 4 including a fixed seat and a piston rod 7. The rear end of the fixed seat of the cylinder 4 is rotatably connected to a support member, which is a gantry column 1. The gantry column 1 is bolted and fixed with a bearing ear seat 2. The rear end of the fixed seat of the cylinder 4 is welded with a joint ball bearing 3. The ball of the joint ball bearing 3 is connected to the bearing ear seat 2 through a pin. The piston rod 7 of the cylinder 4 is vertically rotatably connected to the steering tie rod connecting end of the control arm 12. The front end of the piston rod 7 is connected to a force sensor 8 through a threaded fastener. The front end of the force sensor 8 is connected to a connecting fork rod 10 through a threaded fastener 9. The threaded fastener 9 is a ring member processed with an internal thread. The connection is achieved by processing external threads on the piston rod 7, the connecting fork rod 10, and the force sensor 8 and screwing them with the internal threads of the threaded fastener 9. The connecting fork rod 10 is connected to the connecting block 11 through a pin shaft, and the pin shaft connecting the connecting fork rod 10 and the connecting block 11 is arranged horizontally, so that the connecting fork rod 10 can rotate vertically relative to the connecting block 11. The connecting block 11 is connected to the connecting position of the control arm 12 connected to the automobile steering rod, and the axis of the connection between the connecting fork rod 10 and the connecting block 11 corresponds to the ball center of the control arm 12 connected to the steering rod ball joint when it is actually used.

[0023] A gantry 5 is provided above the front end of the fixing seat of the oil cylinder 4 , and a spring 6 is connected between the gantry 5 and the front end of the fixing seat of the oil cylinder 4 .

[0024] The specific implementation process is as follows: the gantry column 1 mainly supports the oil cylinder 4 to prevent the deformation of the tooling due to excessive force. The oil cylinder 4 is used to provide a certain load through the hydraulic power system to test the relevant performance parameters of the longitudinal or lateral static tensile strength of the control arm 12. There is a force sensor 8 at the front end of the oil cylinder 4 to monitor the magnitude of the force. When a certain load is set, if the load provided by the power system does not meet the requirements, the force sensor 8 will feedback to the power system to continue to apply the load until the requirements are met. The force sensor 8 is installed at the front end of the piston rod 7 of the oil cylinder 4 to facilitate more accurate sensing of the magnitude of the force. The threaded fastener 9 is used to connect the piston rod 7 and the connecting fork rod 10 to prevent it from falling off when the load is too large. The connecting block 11 is used to simulate the actual ball joint joint. The axis connected to the connecting fork rod 10 corresponds to the ball center of the actual ball joint to ensure that the position where the control arm 12 is stressed is consistent with the limit stress condition under the actual vehicle state. The connecting fork rod 10 and the connecting block 11 can rotate up and down around the movable bolt. On the one hand, it can be used to adjust the camber angle, and on the other hand, it can avoid interference in the force application process. During the test, as the force increases, the connecting fork rod 10 can rotate freely on the movable bolt axis, compensating for the force deformation of the control arm 12. The gantry 5 mainly plays the role of support and guide positioning. The oil cylinder 4 is connected to the gantry bracket through the spring 6, so that when the force is applied, the movement of the piston rod 7 of the oil cylinder 4 is consistent with the deformation of the control arm 12 body during the test, avoiding interference.

[0025] This solution will clamp the control arm 12 separately for testing, effectively avoiding the influence of the subframe's own strength and the stiffness of the subframe connection base on the static tensile strength test of the control arm 12. It does not require the preparation of a subframe and related clamping equipment, takes up little space, is not limited by the type of subframe, and is applicable to all types of control arms 12, with high compatibility and versatility. It can simulate the extreme stress and durability of the control arm 12 in the actual vehicle state, evaluate the influence of different material levels or the stiffness of single / double-piece control arms 12, and the bench test verification has high accuracy, thereby guiding the lightweight design and development of various chassis suspension components.

[0026] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A static tensile strength test device for chassis control arms of new energy vehicles, characterized in that: include A support for vertically positioning and clamping the control arm so that the steering tie rod connection end of the control arm is located at the top; A linear telescopic member for applying a load to the control arm, the linear telescopic member comprising a fixed end and a telescopic end; The fixed end of the linear telescopic member is rotatably connected to a support member, the telescopic end of the linear telescopic member is vertically rotatably connected to the steering rod connecting end of the control arm, the telescopic end of the linear telescopic member is connected to a force sensor, a support frame is provided above the linear telescopic member, and an elastic member is connected between the support frame and the linear telescopic member.

2. A static tensile strength test device for chassis control arms of new energy vehicles according to claim 1, characterized in that: The telescopic end of the linear telescopic member is connected to a connecting fork rod through a threaded fastener, the connecting fork rod is connected to a connecting block through a pin shaft, and the connecting block is connected to the control arm at the same connection position as the automobile steering rod.

3. A static tensile strength test device for chassis control arms of new energy vehicles according to claim 2, characterized in that: The linear telescopic member is an oil cylinder or a pneumatic cylinder.

4. A static tensile strength test device for chassis control arms of new energy vehicles according to claim 3, characterized in that: The support member is a gantry column, a bearing ear seat is fixed on the gantry column, a bearing ear seat is provided with a bearing ball, and a fixed end of the linear telescopic member is provided with a joint bearing rotatably connected to the bearing ball.

5. A static tensile strength test device for chassis control arms of new energy vehicles according to claim 4, characterized in that: The support frame is a gantry frame, and the elastic member is a spring connected between the gantry frame and the fixed end of the linear telescopic member.

6. A static tensile strength test device for chassis control arms of new energy vehicles according to claim 5, characterized in that: The axis center of the connection between the connecting fork rod and the connecting block corresponds to the ball center of the control arm connected to the steering rod ball joint when the control arm is actually used.

7. A static tensile strength test device for chassis control arms of new energy vehicles according to claim 6, characterized in that: The pin connecting the connecting fork rod and the connecting block is arranged horizontally, so that the connecting fork rod can rotate vertically relative to the connecting block.

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