An experimental device and method for a front subframe test bench

Abstract

The present application discloses a test device and a test method for a front subframe test bench. The front subframe test bench includes a front subframe and a front suspension, a brake disc, and a steering gear provided on the front subframe; the test device includes: a front subframe mounting module, a front suspension mounting module, a brake disc vertical fixing module for lifting the brake disc upward to simulate the supporting force of the ground on the tire; further includes a wheel simulation loading module, including a wheel simulation tooling connected to the brake disc for simulating a wheel, and a lateral loader and a longitudinal loader for respectively performing lateral loading and longitudinal loading on the wheel simulation tooling; further includes a steering gear fixing module for fixing the steering gear and a brake disc rotation fixing module for clamping the brake disc. The above test device and test method can perform endurance tests on the front subframe test bench under comprehensive working conditions, can better simulate the constraints and multi-directional load conditions of the real working conditions of the front subframe, and is closer to the force-bearing conditions of the front wheels of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and particularly to a test device and a test method for a front subframe bench. Background Art

[0002] Due to the extremely complex force conditions during driving, the front subframe of a vehicle needs to bear both the static load of the vehicle's own weight and load capacity, and at the same time withstand the dynamic load during vehicle movement. Therefore, it is necessary to conduct durability tests on the front subframe assembly to ensure that the strength of the front subframe assembly meets safety requirements.

[0003] Currently, the durability test of the front subframe is mainly completed through vehicle road tests. However, vehicle road tests have a long cycle and high test costs. Therefore, subsequent tooling for bench durability tests of the front subframe has been developed, and the method is simple and easy to implement. The left and right swing arms are assembled with the front subframe, and the 4 body mounting points of the subframe are fixed, and loads are applied at the ball joints of the swing arms. However, this constrained loading method has a low degree of coincidence with road tests, and the failure modes are quite different from road tests, and it cannot meet the accurate simulation requirements of most customers. Summary of the Invention

[0004] The present application provides a test device for a front subframe bench. The front subframe bench includes a front subframe and a front suspension, a brake disc, and a steering gear provided on the front subframe. The test device includes:

[0005] A front subframe installation module for installing the front subframe;

[0006] A front suspension installation module, including a front suspension installation tooling and a front suspension preloading tooling. The front suspension installation tooling is used to connect the front suspension; the front suspension preloading tooling is used to preload the front suspension;

[0007] A brake disc vertical fixing module for lifting the brake disc upward to simulate the supporting force of the ground on the tire;

[0008] A wheel simulation loading module, including a wheel simulation tooling connected to the brake disc for simulating a wheel, and a lateral loader and a longitudinal loader for respectively applying lateral loading and longitudinal loading to the wheel simulation tooling;

[0009] A steering gear fixing module for fixing the steering gear;

[0010] A brake disc rotation fixing module for clamping the brake disc.

[0011] In a specific embodiment, the front subframe mounting module includes a frame formed by longitudinal beams and cross beams, and columns supporting the frame. The longitudinal beam or the cross beam is provided with a mounting tooling, and the mounting tooling includes a left rear mounting tooling, a left front mounting tooling, a right rear mounting tooling, and a right front mounting tooling, which are respectively used to connect the left rear connecting piece, the left front connecting piece, the right rear connecting piece, and the right front connecting piece on the front subframe for connecting the vehicle body.

[0012] In a specific embodiment, the longitudinal beam and the cross beam are connected by arranging waist-shaped holes extending horizontally or longitudinally and cooperating with fasteners; and / or, the mounting tooling and the frame are connected by arranging waist-shaped holes extending horizontally or longitudinally and cooperating with fasteners.

[0013] In a specific embodiment, the front suspension mounting module includes a front suspension mounting base and a support cross beam. The front suspension preloading tooling and the front suspension mounting are arranged at both ends of the support cross beam, and the front suspension mounting base is supported and fixed on the front subframe mounting module.

[0014] In a specific embodiment, the front suspension preloading tooling includes a vertically arranged screw rod, the lower end of the screw rod is connected to the front suspension mounting tooling, and the screw rod is in threaded cooperation with the support cross beam.

[0015] In a specific embodiment, the support cross beam includes a middle beam and end beams connected to both ends of the middle beam; the end beams and the middle beam, and the end beams and the front suspension mounting base are all connected by arranging waist-shaped holes extending horizontally and cooperating fasteners.

[0016] In a specific embodiment, the wheel simulation loading module includes a vertical adjustment component, and the vertical adjustment component adjusts the heights of the lateral loading device, the longitudinal loading device, and the wheel simulation tooling.

[0017] In a specific embodiment, both the lateral loading device and the longitudinal loading device include drive cylinders.

[0018] In a specific embodiment, both the lateral loading device and the longitudinal loading device include a loader base and a hanging door. The vertical adjustment component is a screw thread pair mechanism. The loader base is provided with the screw thread pair mechanism, and one of the cylinder body and the piston rod of the drive cylinder is connected to the screw thread pair mechanism of the loader base;

[0019] The other of the cylinder body and the piston rod passes through the hanging door, and the hanging door is also provided with the screw thread pair mechanism. The screw thread pair mechanism is connected to the cylinder body or the piston rod passing through the hanging door.

[0020] In a specific embodiment, the wheel simulation loading module further includes a loading connection block, which is hinged to the lateral loader and the longitudinal loader, and the wheel simulation tooling is fixed to the loading connection block.

[0021] In a specific embodiment, the brake disc vertical fixing module includes a support base, a connecting cross beam is arranged on the upper part of the support base, one end of the suspension rod is ball-jointed to the connecting cross beam, and the other end is used for ball-jointing with the brake disc.

[0022] In a specific embodiment, the suspension rod is a telescopic and adjustable rod structure.

[0023] In a specific embodiment, the steering gear fixing module includes a fixed base, the fixed base is fixed to the frame, and the fixed base is further provided with a clamp for clamping the steering column of the steering gear.

[0024] In a specific embodiment, the clamp and the fixed base are fastened by arranging oblong holes extending horizontally or vertically and cooperating with fasteners.

[0025] In a specific embodiment, the brake disc rotation fixing module includes a U-shaped base, the U-shaped base is used for fixing to the steering knuckle, and a plurality of fastening holes are arranged on the two side plates of the U-shaped base, and a plurality of the bolts can pass through the fastening holes to abut against the brake disc.

[0026] The present application also provides a test method for the front subframe test bench, which is carried out by using the test device for the front subframe test bench described in any one of the above; including the following steps:

[0027] Install the front subframe to the front subframe installation module, and connect the top of the front suspension to the front suspension installation tooling;

[0028] Preload the front suspension through the front suspension preloading tooling to apply the full vehicle load;

[0029] Connect the brake disc vertical fixing module to the brake disc to lift the brake disc to the height under the full vehicle load;

[0030] Fix the steering gear through the steering gear fixing module, and clamp the brake disc through the brake disc rotation fixing module;

[0031] Apply a lateral force and a longitudinal force to the simulated grounding position of the wheel simulation tooling through the lateral loader and the longitudinal loader.

[0032] The above test device and test method can conduct durability tests on the front subframe bench under comprehensive working conditions, simulate the working conditions of simultaneous braking and steering, that is, simulate the steering and braking durability conditions. The test sample is in the form of a front subframe with a front suspension. Among them, the front subframe bench is a large assembly consisting of a swing arm, a steering gear, a stabilizer bar, a front suspension, a steering knuckle, and a brake disc. When testing this test sample, the front subframe can be positioned at the full-load position through the front subframe installation module, the front suspension installation module, and the brake disc vertical fixing module. The lateral and longitudinal loads are applied to the tire grounding position through the wheel simulation loading module. The vertical load on the front subframe is realized by applying a preload to the brake disc through the brake disc vertical fixing module. The longitudinal and lateral loads on the front subframe are realized by the wheel simulation loading module. Through multi-axis tests, multi-directional loading (i.e., vertical, longitudinal, and lateral) can be carried out on the front subframe, which can better simulate the constraints and multi-directional load conditions of the actual working conditions of the front subframe, be closer to the force conditions of the front wheels of the whole vehicle, have a high degree of coincidence with the actual road test failure mode, and have high test accuracy, which can meet the accurate simulation needs of most customers. Description of the Drawings

[0033] Figure 1 Schematic diagram of the front subframe bench test device and the installed front subframe bench in the embodiment of the present application;

[0034] Figure 2 For Figure 1 Schematic diagram of the front subframe bench in;

[0035] Figure 3 For Figure 1 Schematic diagram of the front subframe installation module in;

[0036] Figure 4 For Figure 1 Bottom view of;

[0037] Figure 5 For Figure 1 Schematic diagram of the front suspension installation module in;

[0038] Figure 6 For Figure 1 Schematic diagram of the brake disc vertical fixing module in;

[0039] Figure 7 For Figure 1 Schematic diagram of the wheel simulation loading module in;

[0040] Figure 8 Schematic diagram of the steering gear fixing module of the test device in the embodiment of the present application;

[0041] Figure 9 For Figure 1 Schematic diagram of the brake disc rotation fixing module in.

[0042] Figure 1-9 The descriptions of the reference numerals in the drawings are as follows:

[0043] 11 - Front suspension; 12 - Front subframe; 12a - Left rear connecting member; 12b - Left front connecting member; 12c - Right rear connecting member; 12d - Right front connecting member; 121 - Swing arm; 13 - Brake disc; 14 - Steering knuckle; 15 - Steering gear; 151 - Steering column; 16 - Stabilizer bar;

[0044] 2 - Front subframe mounting module; 21 - Strut; 22 - Longitudinal beam; 22a - Mounting hole; 23 - Cross beam; 23a - First kidney-shaped hole; 241 - Right rear mounting tooling; 242 - Left rear mounting tooling; 24a - Second kidney-shaped hole; 251 - Right front mounting tooling; 252 - Left front mounting tooling; 25a - Third kidney-shaped hole;

[0045] 3 - Wheel simulation loading module; 31 - Longitudinal loader base; 32 - Lateral loader base; 33 - Wheel simulation tooling; 34 - Longitudinal hatch; 35 - Lateral hatch; 36 - Longitudinal drive cylinder; 37 - Lateral drive cylinder; 38 - Screw thread pair mechanism; 39 - Screw thread pair mechanism; 310 - Loading connection block; 311 - Longitudinal detection element; 312 - Lateral detection element;

[0046] 4 - Brake disc vertical fixing module; 41 - Support seat; 42 - Connecting beam; 43 - Suspension rod; 44 - Ball joint end;

[0047] 5 - Steering gear fixing module; 51 - Fixing base; 51a - Sixth kidney-shaped hole; 52 - Bolt; 53 - Clamp;

[0048] 6 - Brake disc rotation fixing module; 61 - U-shaped base; 62 - Bolt; 63 - Bolt;

[0049] 7 - Front suspension mounting module; 71 - Middle beam; 71a - Fourth kidney-shaped hole; 72 - Front suspension mounting base; 72a - Fifth kidney-shaped hole; 73 - End beam; 74 - Handle; 75 - Screw; 76 - Front suspension mounting tooling; Detailed implementation manners

[0050] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0051] Please refer to Figure 1 and 2 , Figure 1 which are schematic diagrams of the front subframe bench test device and the front subframe after bench installation in the embodiments of the present application; Figure 2 is Figure 1 a schematic diagram of the front subframe bench in

[0052] As shown inFigure 2 As shown in Figure 2 , the front subframe bench includes a front subframe 12. Swing arms 121 are provided on the left and right sides of the front subframe 12. The outer ends of the swing arms 121 are connected to steering knuckles 14. A brake disc 13 is connected to the steering knuckle 14. The lower end of the front suspension 11 is also connected to the steering knuckle 14. The front subframe 12 is further provided with a stabilizer bar 16. Here, the left - right and front - rear directions can also be understood with reference to the driving direction of the vehicle. The forward direction of the vehicle is the front, and the reverse is the rear. The left and right sides of the vehicle are the left and right sides of the front subframe 12. Connecting members for connecting to the vehicle body are provided at both the left and right positions at the front end and the left and right positions at the rear end of the front subframe 12. The connecting members are specifically sleeve structures. The four connecting members are a left - rear connecting member 12a, a left - front connecting member 12b, a right - rear connecting member 12c, and a right - front connecting member 12d.

[0053] Please continue to refer to Figure 1 , the test device in the embodiment of the present application includes a front subframe installation module 2 for installing the front subframe 12, a front suspension installation module 7 for installing the front suspension 11, as well as a brake disc vertical fixing module 4, a wheel simulation loading module 3, a steering gear fixing module 5, and a brake disc rotation fixing module 6. Below, all the modules will be described one by one.

[0054] Please continue to refer to Figure 3 、 4 Understand, Figure 3 For Figure 1 is a schematic diagram of the front subframe installation module 2 in

[0055] Figure 4 For Figure 1 is a bottom view of

[0056] In this embodiment, the front subframe installation module 2 includes a frame and columns 21 supporting the frame. As Figure 3 shown, the frame is formed by cross - beams 23 and longitudinal beams 22. Specifically, two longitudinal beams 22 and two cross - beams 23 are provided. When installing the front subframe 12, the cross - beams 23 extend in the left - right direction, and the longitudinal beams 22 extend in the front - rear direction. When the front subframe 12 needs to be installed onto the frame, the number of cross - beams 23 and longitudinal beams 22 of the frame is not limited to two and can also be more. In order to stably support the frame, Figure 3 in Figure 3 , four columns 21 are respectively provided at the four corners of the frame. The columns 21 are cylindrical structures. A connecting plate is provided at the bottom of the columns 21 for fixing to the test platform or the ground. It can be seen that the structure for supporting the frame can also be other structural forms, such as only providing one support seat structure at both the front and rear ends as the columns. The columns 21 specifically support at the ends of the longitudinal beams 22. It can be seen that the cross - beams 23 are provided at the bottom of the longitudinal beams 22, and it is also possible for the columns 21 to support the cross - beams 23.

[0057] The longitudinal beams 22 or cross - beams 23 of the frame are provided with installation tools for connecting to the front subframe 12. AsFigure 4 As shown in the figure, the installation tooling in this embodiment is arranged on two longitudinal beams 22. There are two installation toolings distributed in the front-rear direction on each longitudinal beam 22, namely the left-rear installation tooling 242, the left-front installation tooling 252, the right-rear installation tooling 241, and the right-front installation tooling 251, which are respectively used to connect the left-rear 12a, the left-front connector 12b, the right-rear connector 12c, and the right-front connector 12d of the front subframe 12. In this way, by using the existing connectors on the front subframe 12 that are connected to the vehicle body to connect with the front subframe installation module 2, the connection state between the front subframe 12 and the vehicle body can be more closely approximated, improving the reliability of the test results. Of course, the front subframe 12 and the front subframe installation module 2 can also establish connections at other positions.

[0058] In addition, in this embodiment, the longitudinal beam 22 and the cross beam 23 are connected by arranging oblong holes extending horizontally or longitudinally and cooperating with fasteners. The fasteners can be bolts. As Figure 4 shown, specifically, a first oblong hole 23a extending horizontally is arranged on the cross beam 23 above. In this way, by adjusting the position of the cooperation between the bolt and the first oblong hole 23a, the distance between the two longitudinal beams 22 can be adjusted to adapt to the installation of the front subframe 12 with different spans. Similarly, arranging oblong holes extending longitudinally can adjust the longitudinal length.

[0059] The installation tooling itself can also be connected to the frame by arranging oblong holes extending horizontally or longitudinally and cooperating with fasteners for fine adjustment. As Figure 4 shown, the left-rear installation tooling 242 and the right-rear installation tooling 241 are provided with second oblong holes 24a extending longitudinally, and the left-front installation tooling 252 and the right-front installation tooling 251 are provided with third oblong holes 23a extending horizontally, which can respectively adjust the longitudinal and horizontal distances.

[0060] Please also see Figure 5 , Figure 5 which is Figure 1 a schematic diagram of the front suspension installation module 7 in the figure.

[0061] As Figure 1 , 5 shown, the front suspension installation module 7 includes a front suspension installation base 72 and a support cross beam. The front suspension installation base 72 is supported and fixed on the front subframe installation module 2. A total of two front suspension installation bases 72 are arranged in the left-right direction, and are respectively supported and fixed on the left and right two longitudinal beams 22.

[0062] The support cross beam specifically includes a middle beam 71 and end beams 73 connected to both ends of the middle beam 71; both the end beam 73 and the middle beam 71, and the end beam 73 and the front suspension installation base 72 are connected by arranging oblong holes extending horizontally and cooperating fasteners. Figure 5It is shown in the figure that the middle beam 71 is provided with a fourth kidney-shaped hole 71a for connecting with the end beam 73, so that the transverse length of the support crossbeam can be adjusted to adapt to the transverse span requirements of the front suspension 11 of different models of the front subframe 12. The front suspension mounting base 72 is also provided with a fifth kidney-shaped hole 72a for connecting with the longitudinal beam 22 to adjust the longitudinal spacing of the front suspension mounting module 2.

[0063] As Figure 5 shown, preloading tools for the front suspension and front suspension mounting tools 76 are respectively arranged at both ends of the support crossbeam. The front suspension mounting tools 76 at the left and right ends of the support crossbeam are respectively used to connect with the front suspensions 11 on the left and right sides. The bottom of the front suspension 11 is connected to the front subframe bench, and the top of the front suspension 11 is connected to the front suspension mounting tool 76.

[0064] Specifically, in this embodiment, the preloading tool for the front suspension includes a vertically arranged screw rod 75. The lower end of the screw rod 75 is connected to the front suspension mounting tool 76. The screw rod 75 is in threaded cooperation with the end beam 73 of the support crossbeam. In this way, when the screw rod 75 rotates, the screw rod 75 moves vertically relative to the end beam 73. When moving downward, the full vehicle load can be applied to the front suspension 11 through the front suspension mounting tool 76 to preload the front suspension 11, that is, to pre-compress the spring of the front suspension 11 to simulate the load condition of the front suspension 11 when the vehicle is fully loaded. In this embodiment, for the convenience of preloading, a handle 74 fixedly or circumferentially limitedly connected to the screw rod 75 is provided. The load can be applied directly by manually rotating the handle 74, and the operation is very convenient. Of course, other preloading tools for the front suspension can also be set, such as setting a hydraulic cylinder to press down the front suspension 11, etc. The screw rod 75 structure set in this embodiment as the preloading tool for the front suspension is relatively simple and has a low cost.

[0065] Please continue to refer to Figure 6 , Figure 6 For Figure 1 the schematic diagram of the brake disc vertical fixing module 4 in

[0066] The brake disc vertical fixing module 4 is used to lift the brake disc 13 upward to simulate the supporting force of the ground on the tire. In the actual working condition, when the vehicle is fully loaded and the load is transmitted by the front suspension 11, the front suspension 11 is compressed under pressure, and the center of gravity of the wheel will also drop to a certain height, which is a determinable value according to the vehicle standard. The test device in this embodiment needs to simulate and test the acting force of the ground on the wheel grounding position, so the brake disc 13 cannot be supported by the ground or other platforms, otherwise the friction force will affect the test. Therefore, to simulate the working condition of the wheel being supported by the ground, in this embodiment, the full vehicle load is applied through the preloading tool for the front suspension, and the brake disc 13 is lifted by the brake disc vertical fixing module 4 to simulate the supporting force of the ground, and it can be lifted to the position where the brake disc 13 drops when actually fully loaded. As Figure 1As shown, a total of two vertical fixing modules 4 for brake discs are provided, which are respectively used to connect the brake discs 13 on the left and right sides.

[0067] As Figure 6 shown, the vertical fixing module 4 for brake discs in this embodiment includes a support seat 41. The support seat 41 is specifically a columnar structure. A connecting cross beam 42 is provided on the upper part of the support seat 41. The connecting cross beam 42 is connected with a suspension rod 43. One end of the suspension rod 43 is ball-jointed to the connecting cross beam 42, and the other end is used to be ball-jointed to the brake disc 13. Figure 6 The ball-joint end 44 where the suspension rod 43 is used to be ball-jointed to the brake disc 13 is shown in Figure 1 shown. The suspension rod 43 is beneficial to provide a reliable lifting force. The two ends of the suspension rod 43 are ball-jointed, which can meet a certain angular deviation adaptability. Figure 6 In

[0068] As Figure 7 shown, Figure 7 is Figure 1 a schematic diagram of the wheel simulation loading module 3 in

[0069] The wheel simulation loading module 3 in this embodiment includes a wheel simulation tooling 33 connected to the brake disc 13 for simulating a wheel, and a lateral loader for laterally loading the wheel simulation tooling 33 and a longitudinal loader for longitudinally loading. As Figure 7 shown, both the lateral loader and the longitudinal loader include drive cylinders, namely a lateral drive cylinder 37 and a longitudinal drive cylinder 36. To provide a larger force, a hydraulic cylinder can be used. The lateral loader here applies a load along the transverse direction to simulate the lateral force received by the wheel on the ground. Generally, when a vehicle is turning and braking, the wheel will receive both longitudinal and lateral forces from the ground.

[0070] As Figure 7 shown, the wheel simulation tooling 33 is a plate-like structure. A connecting hole for connecting to the middle part of the brake disc 13 is provided on its upper part. Its lower end is connected to the lateral loader and the longitudinal loader through a loading connection block 310. The distance between the connecting hole and the lower end where the loading connection block 310 is connected is equal to the radius of the wheel. In this way, it can be equivalent to simulating the position where the loader acts on the contact between the wheel and the ground.

[0071] The wheel simulation loading module 3 includes a vertical adjustment component, which adjusts the heights of the lateral loader, the longitudinal loader, and the wheel simulation tooling 33, so as to be adapted to connect to brake discs 13 at different heights. As Figure 7As shown, the vertical adjustment components are the screw thread pair mechanisms 38 and 39. The lateral loader and the longitudinal loader are respectively connected to the screw thread pair mechanisms. When the screw rotates, it can drive the lateral loader, the longitudinal loader, and the wheel simulation tooling 33 connected to the loader to lift, so as to adjust the height.

[0072] The wheel simulation loading module 3 further includes two groups of loader bases and hanging doors, namely the lateral loader base 32, the longitudinal loader base 31, and the lateral hanging door 35 and the longitudinal hanging door 34, which respectively correspond to the lateral driving cylinder 37 and the longitudinal driving cylinder 36. Among them, the loader base is provided with the above-mentioned screw thread pair mechanism. Figure 7 Among them, the lateral loader base 32 is provided with the screw thread pair mechanism 39, and the lateral hanging door 35 is provided with the screw thread pair mechanism 38. One of the cylinder block and the piston rod of the driving cylinder is connected to the screw thread pair mechanism of the loader base, and the other of the cylinder block and the piston rod of the driving cylinder passes through the hanging door, and the hanging door is also provided with a screw thread pair mechanism, and the screw thread pair mechanism is connected to the cylinder block or the lever passing through the hanging door. As Figure 1 shown, the cylinder block of the longitudinal driving cylinder 36 is connected to the screw thread pair mechanism of the longitudinal loader base 31. The longitudinal hanging door 34 is arranged across the longitudinal driving cylinder 36. The top of the piston rod of the longitudinal driving cylinder 36 is connected to the screw thread pair mechanism of the longitudinal hanging door 34, and the end of the piston rod is connected to the loading connection block 310; the cylinder block of the lateral driving cylinder 37 is connected to the screw thread pair mechanism 39 of the lateral loader base 32. The lateral hanging door 35 is arranged across the lateral driving cylinder 37. The top of the piston rod of the lateral driving cylinder 37 is connected to the screw thread pair mechanism 38 of the lateral hanging door 35, and the end of the piston rod is connected to the loading connection block 310.

[0073] When setting the loader base, a hanging door is also set and a screw thread pair mechanism is configured, which can provide two support points for the lateral loader and the longitudinal loader, and can ensure the reliability and stability of the load applied by the loader. It can be seen that the wheel simulation loading module 3 is not limited to this. For example, a structure for driving lifting can be set at the bottom of the lateral loader and the longitudinal loader to achieve height adjustment, and the loader is not limited to a driving cylinder. For example, it can also be a screw structure.

[0074] As Figure 7 shown, the wheel simulation loading module 3 further includes a loading connection block 310. The loading connection block 310 is hinged to the lateral loader and the longitudinal loader, and the hinge axis is vertically arranged. The wheel simulation tooling 33 is fixed to the loading connection block 310. The setting of the loading connection block 310 facilitates the connection between the wheel simulation tooling 33 and the lateral loader and the longitudinal loader, and the hinge allows for fine adjustment of the position.

[0075] As Figure 7As shown, the longitudinal drive cylinder 36 and the lateral drive cylinder 37 are respectively provided with a longitudinal detection element 311 and a lateral detection element 312 for detecting the stroke of the corresponding drive cylinder and can also control the stroke of the drive cylinder to control the action of the drive cylinder according to the required applied force.

[0076] As Figure 8 shown, Figure 8 is a schematic diagram of the steering gear fixing module 5 of the test device in the embodiment of the present application. Figure 1 It cannot be fully shown due to occlusion in

[0077] The steering gear fixing module 5 is used to fix the steering gear 15, that is, to simulate holding the steering wheel and prevent the steering gear 15 from driving the wheels to rotate during the test, that is, to prevent Figure 2 the brake disc 13 and the steering knuckle 14 in Figure 8 from rotating together, so as not to affect the test. Figure 4 In Figure 8 the steering gear fixing module 5 includes a fixed base 51, and the fixed base 51 is fixed to the frame of the front subframe mounting module 2. As

[0078] Please refer to Figure 9 Figure 9 which is Figure 1 a schematic diagram of the brake disc rotation fixing module 6 in

[0079] The brake disc rotation fixing module 6 in this embodiment is used to hold the brake disc 13 to prevent the brake disc 13 from rotating and affecting the test, that is, to simulate the working condition of stepping on the brake. As Figure 9 shown, the brake disc rotation fixing module 6 includes a U-shaped base 61. One side of the U-shaped base 61 is used to be fixed to the steering knuckle 14 and can be fixed to the steering knuckle 14 through a bolt 63 on one side. In addition, a plurality of fastening holes are provided on both side plates of the U-shaped base 61, and a plurality of bolts 62 can pass through the fastening holes to press against the brake disc 13 to clamp the brake disc 13. This structure for realizing braking is relatively simple and is easy to process, manufacture and install.

[0080] This embodiment also provides a test method for the front subframe bench, which is carried out by the test device of the front subframe bench described above; including the following steps:

[0081] ​Install the front subframe 12 to the front subframe installation module 2, that is, connect the left rear mounting part 12a, right rear mounting part 12b, left front mounting part 12c, and right front mounting part 12d to the left rear mounting tooling 242, right rear mounting tooling 241, left front mounting tooling 252, and right front mounting tooling 251 respectively; also connect the top of the front suspension 11 to the front suspension mounting tooling 76;

[0082] Preload the front suspension 11 through the front suspension preloading tooling, and apply the full vehicle load;

[0083] Connect the brake disc vertical fixing module 4 to the brake disc 13 to lift the brake disc 13 to the height under the full vehicle load;

[0084] Fix the steering gear 15 through the steering gear fixing module 5, and hold the brake disc 13 through the brake disc rotation fixing module 6;

[0085] Apply lateral force and longitudinal force to the simulated grounding position of the wheel simulation tooling 33 through the lateral loader and longitudinal loader of the wheel simulation loading module 3 respectively.

[0086] The above-mentioned "including the following steps" means that this test method includes these steps, but does not limit the order of the steps. Under the premise of non-contradiction, they can be replaced or carried out simultaneously. For example, the steps of fixing the steering gear 15 and holding the brake disc 13 above can be carried out first, or can be interspersed between other steps. The step of lifting the brake disc 13 needs to be carried out after the front suspension preloading tooling preloads the front suspension 11.

[0087] The above test device and test method can conduct durability tests on the front subframe test bench under comprehensive working conditions, and can simulate the working conditions of simultaneous braking and steering, that is, simulate the steering and braking durability working conditions. The test sample is in the form of a front subframe 12 with a front suspension. Among them, the front subframe test bench is a large assembly consisting of a swing arm 121, a steering gear 15, a stabilizer bar 16, a front suspension 11, a steering knuckle 14, and a brake disc 13. When testing this test sample, the front subframe 12 can be positioned at the full load position through the front subframe installation module 2, the front suspension installation module 7, and the brake disc vertical fixing module 4. The lateral and longitudinal loads are applied to the tire grounding position through the wheel simulation loading module 3. The vertical load on the front subframe 12 is realized by applying preload to the brake disc 13 through the brake disc vertical fixing module 4. The longitudinal and lateral loads on the front subframe 12 are realized by the wheel simulation loading module 3. The front subframe 12 can be loaded in multiple directions (i.e., vertically, longitudinally, and laterally) through multi-axis tests, which can better simulate the constraints and multi-directional load conditions of the real working conditions of the front subframe 12, be closer to the force conditions of the front wheels of the whole vehicle, have a high degree of coincidence with the actual road test failure mode, and have high test accuracy, and can meet the accurate simulation needs of most customers.

[0088] In this article, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for helping to understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An experimental device for a front subframe test bench. The front subframe test bench includes a front subframe and front suspension, brake discs, and a steering gear arranged on the front subframe; it is characterized in that, The test device includes: A front subframe mounting module for mounting the front subframe; A front suspension mounting module, including a front suspension mounting tooling and a front suspension preloading tooling. The front suspension mounting tooling is used to connect the front suspension; the front suspension preloading tooling is used to preload the front suspension; A brake disc vertical fixing module for lifting the brake disc upward to simulate the ground's supporting force on the tire; A wheel simulation loading module, including a wheel simulation tooling connected to the brake disc for simulating a wheel, and a lateral loader and a longitudinal loader for respectively performing lateral loading and longitudinal loading on the wheel simulation tooling; A steering gear fixing module for fixing the steering gear; A brake disc rotation fixing module for clamping the brake disc.

2. The test device for the front subframe bench according to claim 1, characterized in that, The front subframe mounting module includes a frame formed by longitudinal beams and cross beams, and columns supporting the frame. The longitudinal beam or the cross beam is provided with mounting tooling, and the mounting tooling includes a left rear mounting tooling, a left front mounting tooling, a right rear mounting tooling, and a right front mounting tooling, which are respectively used to connect the left rear connecting member, the left front connecting member, the right rear connecting member, and the right front connecting member on the front subframe for connecting the vehicle body.

3. The test device for the front subframe bench according to claim 2, characterized in that The longitudinal beam and the cross beam are connected by providing oblong holes extending horizontally or vertically and cooperating with fasteners; and / or, the mounting tooling and the frame are connected by providing oblong holes extending horizontally or vertically and cooperating with fasteners.

4. The test device for the front subframe bench according to claim 1, characterized in that, The front suspension mounting module includes a front suspension mounting base and a support cross beam. The front suspension preloading tooling and the front suspension mounting are provided at both ends of the support cross beam, and the front suspension mounting base is supported and fixed on the front subframe mounting module.

5. The test device for the front subframe bench according to claim 4, characterized in that, The front suspension preloading tooling includes a vertically arranged screw, the lower end of the screw is connected to the front suspension mounting tooling, and the screw is in threaded cooperation with the support cross beam.

6. The test device for the front subframe bench according to claim 5, characterized in that, The support cross beam includes a middle beam and end beams connected to both ends of the middle beam; the end beam and the middle beam, and the end beam and the front suspension mounting base are all connected by providing oblong holes extending horizontally and cooperating fasteners.

7. The test device for the front subframe bench according to claim 1, characterized in that The wheel simulation loading module includes a vertical adjustment component for adjusting the heights of the lateral loader, the longitudinal loader, and the wheel simulation tooling.

8. The test device for the front subframe bench according to claim 7, characterized in that, Both the lateral loader and the longitudinal loader include drive cylinders.

9. The test device for the front subframe bench according to claim 8, characterized in that, Both the lateral loader and the longitudinal loader include a loader base and a hanging door. The vertical adjustment component is a screw thread pair mechanism. The loader base is provided with the screw thread pair mechanism, and one of the cylinder body and the piston rod of the drive cylinder is connected to the screw thread pair mechanism of the loader base; The other of the cylinder body and the piston rod passes through the hanging door, and the hanging door is also provided with the screw thread pair mechanism, and the screw thread pair mechanism is connected to the cylinder body or the piston rod passing through the hanging door.

10. The test device for the front subframe bench according to any one of claims 7-9, characterized in that, The wheel simulation loading module further includes a loading connection block, the loading connection block is hinged to the lateral loader and the longitudinal loader, and the wheel simulation tooling is fixed to the loading connection block.

11. The test device for the front subframe bench according to any one of claims 1-6, characterized in that, The vertical fixing module of the brake disc includes a support seat and a suspension rod. A connecting cross beam is arranged on the upper part of the support seat. One end of the suspension rod is ball-jointed to the connecting cross beam, and the other end is used to be ball-jointed to the brake disc.

12. The test device for the front subframe bench according to claim 11, characterized in that, The suspension rod is a telescopic and adjustable rod structure.

13. The test device for the front subframe bench according to claim 2 or 3, characterized in that The steering gear fixing module includes a fixed base, which is fixed to the frame. The fixed base is also provided with a clamp for clamping the steering column of the steering gear.

14. The test device for the front subframe bench according to claim 13, characterized in that, The clamp and the fixed base are fastened by arranging oblong holes extending horizontally or vertically and cooperating with fasteners.

15. The test device for the front subframe bench according to any one of claims 1-6, characterized in that, The rotating and fixing module of the brake disc includes a U-shaped base and bolts. The U-shaped base is used to be fixed to the steering knuckle, and both side plates of the U-shaped base are provided with a plurality of fastening holes. The plurality of bolts can pass through the fastening holes to press against the brake disc.

16. A test method for a front subframe bench, characterized in that, It is carried out by the test device of the front subframe bench described in any one of claims 1-15; including the following steps: Install the front subframe to the front subframe installation module, and connect the top of the front suspension to the front suspension installation tooling. Preload the front suspension through the front suspension preloading tooling and apply the full vehicle load. Connect the vertical fixing module of the brake disc to the brake disc to lift the brake disc to the height under the full vehicle load. Fix the steering gear through the steering gear fixing module and clamp the brake disc through the rotating and fixing module of the brake disc. Apply lateral force and longitudinal force to the simulated grounding position of the wheel simulation tooling through the lateral loader and the longitudinal loader.

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