A suspension vibration performance measurement device

Abstract

This invention provides a suspension vibration performance measurement device. The device includes a wheel load cell, comprising a tire tray, a steering wheel, and a load measurement sensor, the load measurement sensor being used to measure unsprung mass; a suspension travel measuring instrument, comprising a suction cup assembly, a fixing device, and a first cable displacement sensing component, the first cable displacement sensing component being used to measure the distance of the vehicle suspension's extension and compression travel; and a suspension spring displacement measuring instrument, comprising a fixing mechanism and a second cable displacement sensing component, the second cable displacement sensing component being used to measure the distance of the vehicle body spring's compression and extension travel during the vehicle suspension's extension and compression travel. This invention provides a suspension vibration performance measurement device that can effectively obtain unsprung mass, the distance of the vehicle suspension's extension and compression travel, and the distance of the vehicle body spring's compression and extension travel.

Description

Technical Field

[0001] This invention relates to the field of automotive testing technology, and in particular to a suspension vibration performance measurement device. Background Technology

[0002] The automotive chassis suspension system is the main assembly that ensures a vehicle has good ride comfort and handling stability. It generally consists of elastic elements, shock absorbers, and guiding mechanisms. Figure 1 A schematic diagram of a rear axle multi-link suspension in the prior art is shown. As shown, the spring rocker arm 101 is connected to the wheel hub 102 via a wheel bracket, the bottom of the shock absorber 103 is connected to the spring rocker arm 101, and its top is connected to the vehicle body. The bottom of the coil spring 104 is connected to the spring rocker arm 101, and its top is connected to the upper limit seat 107 of the vehicle body.

[0003] In the early stages of chassis development, chassis tuning is necessary. This involves adjusting the parameters of the elastic elements (coil springs 104) and shock absorbers 103 in the suspension system based on the existing chassis to achieve optimal ride comfort and handling stability, as well as a balance between the two. Suspension vibration performance parameters are not only used in the early stages of chassis development but also provide guidance for subsequent handling and ride comfort analysis of the vehicle.

[0004] In existing technologies, suspension system vibration performance parameters are typically obtained on a K&C (Kinematik, kinematics; C: Compliance, dynamics) test bench. However, K&C test benches are expensive, and currently only a few OEMs possess the necessary equipment. Furthermore, the large and complex structure of K&C test benches places high demands on the installation environment, resulting in long testing cycles and high costs for suspension vibration performance parameters. Another approach is to use a measuring tape and existing wheel load testers for simple measurements, but these are inaccurate and affect measurement precision. The main drawback is that…

[0005] a) The wheel edge displacement and the displacement of the 104 end of the helical spring were measured manually with a tape measure. During the measurement process, the tape measure could not be guaranteed to be completely vertical, and there were errors in the readings by human eyes, resulting in inaccurate measurements.

[0006] b) Using existing wheel load cells for weighing cannot eliminate the friction between the tire and the wheel load cell, resulting in measurement errors.

[0007] Therefore, both using a K&C test bench and a combination of a tape measure and a wheel load tester have their own problems. Finding a low-cost method to quickly measure and obtain the vibration performance parameters of the suspension system is an urgent issue to be addressed. Summary of the Invention

[0008] To address the aforementioned problems in the prior art, this invention proposes a suspension vibration performance measurement device that can effectively obtain the unsprung mass, the distance of the vehicle suspension's extension and compression strokes, and the distance of the vehicle body spring's compression and extension strokes.

[0009] Specifically, this invention proposes a suspension vibration performance measurement device, applicable to vehicles, comprising:

[0010] The wheel load cell includes a tire tray, a swivel plate, and a load measurement sensor. The tire tray is mounted on the swivel plate via the load measurement sensor. The tire tray is used to support the tire, and the load measurement sensor is used to measure the unsprung mass.

[0011] A suspension travel measuring instrument includes a suction cup assembly, a fixing device, and a first cable displacement sensing component. The suction cup assembly is fixed to the wheel arch of the vehicle, the fixing device is fixed to the outer side of the wheel corresponding to the wheel arch, and the first cable displacement sensing component is fixed between the suction cup assembly and the fixing device. The first cable displacement sensing component is used to measure the distance of the extension and compression travel of the vehicle suspension.

[0012] A suspension spring displacement measuring instrument includes a fixing mechanism and a second cable displacement sensing component. The top of the second cable displacement sensing component is fixed to the upper limit seat of the spring on the vehicle body, and the bottom of the second cable displacement sensing component is fixed to the spring rocker arm of the vehicle through the fixing mechanism. The second cable displacement sensing component is used to measure the distance of the compression and extension strokes of the vehicle body spring during the extension and compression strokes of the vehicle suspension.

[0013] According to one embodiment of the present invention, the corner disk includes a corner disk cover, a corner disk base and a sliding pair device coaxially arranged, the corner disk cover covering the corner disk base, and the sliding pair device being provided between the corner disk cover and the corner disk base;

[0014] The load measuring sensor is fixedly mounted on the top of the corner plate cover, and the tire tray is fixedly mounted on the top of the load measuring sensor. The load measuring sensor, the corner plate cover, and the tire tray are coaxial.

[0015] When friction occurs between the tire tray and the vehicle tire, the tire tray causes the corner plate cover to rotate relative to the corner plate base via the sliding pair device.

[0016] According to one embodiment of the present invention, the sliding pair device includes a ball bearing disk, a connecting disk, and multiple tension springs. The ball bearing disk and the connecting disk are annular. The ball bearing disk is disposed around the periphery of the connecting disk. The inner edge of the ball bearing disk is connected to the outer edge of the connecting disk through the tension springs. Multiple ball bearings are provided on the ball bearing disk. The balls in the ball bearings contact the bottom surface of the corner plate cover or the top surface of the corner plate base. The connecting disk is sleeved on the connecting shaft of the corner plate cover.

[0017] According to one embodiment of the present invention, the fixing device includes a positioning base, a plurality of powerful magnets, a wheel alignment plate and a alignment plate connecting shaft. The plurality of powerful magnets are disposed on the positioning base for magnetically fixing to the tire fastening bolts of the wheel hub. The alignment plate connecting shaft is fixed to the center of the positioning base. The wheel alignment plate is threadedly engaged with the alignment plate connecting shaft. The wheel alignment plate is fixedly engaged with the central groove of the wheel hub.

[0018] According to one embodiment of the present invention, a plurality of radially extending through slots are formed on the positioning base, and the powerful magnet passes through the through slots.

[0019] According to one embodiment of the present invention, the first pull-wire displacement sensing assembly includes a first fisheye bearing, a connecting rod, a second fisheye bearing, a mounting base, and a first pull-wire displacement sensor. The first fisheye bearing is fixed to the suction cup assembly, one end of the connecting rod is fixed to the first fisheye bearing, the second fisheye bearing is fixed to the positioning base, one end of the mounting base is fixed to the second fisheye bearing, the first pull-wire displacement sensor is fixed to the mounting base, and the pull wire of the first pull-wire displacement sensor is fixed to the other end of the connecting rod.

[0020] According to one embodiment of the present invention, the first draw wire displacement sensing component further includes a circular level disposed on the first draw wire displacement sensor.

[0021] According to one embodiment of the present invention, the fixing mechanism includes a sensor fixing clamp and a rocker arm fixing clamp, the sensor fixing clamp being used to fix the second pull wire displacement sensor assembly, and the rocker arm fixing clamp being used to fix the sensor fixing clamp onto the spring rocker arm.

[0022] According to one embodiment of the present invention, the second cable displacement sensor assembly includes a top bracket and a second cable displacement sensor, the top bracket being fixed to the upper limit seat of the spring on the vehicle body, and the second cable displacement sensor being fixed to the sensor fixing clamp.

[0023] According to one embodiment of the present invention, a magnet is provided on the sensor fixing clamp for magnetically fixing the second wire displacement sensor.

[0024] This invention provides a suspension vibration performance measurement device, which uses a wheel load meter, a suspension travel measuring instrument, and a suspension spring displacement measuring instrument to obtain the unsprung mass, the distance of the vehicle suspension's tensile and compressive travel, and the distance of the body spring's compression and tensile travel, and then calculates various vibration performance parameters of the suspension system.

[0025] It should be understood that the above general description and the following detailed description of the invention are exemplary and illustrative, and are intended to provide further explanation of the invention as described in the claims. Attached Figure Description

[0026] The accompanying drawings are included to provide a further understanding of the invention; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with this specification, serve to explain the principles of the invention. In the drawings:

[0027] Figure 1 A schematic diagram of a rear axle multi-link suspension in the prior art is shown.

[0028] Figure 2 A diagram illustrating the usage status of a suspension vibration performance measurement device according to an embodiment of the present invention is shown.

[0029] Figure 3 A diagram illustrating the usage status of a suspension travel measuring instrument according to an embodiment of the present invention is shown.

[0030] Figure 4 A diagram illustrating the usage status of a suspension vibration performance measurement device according to an embodiment of the present invention is shown.

[0031] Figure 5 yes Figure 4 A partial schematic diagram.

[0032] Figure 6 A schematic diagram of the structure of a wheel load meter according to an embodiment of the present invention is shown.

[0033] Figure 7 yes Figure 6 A schematic diagram of the sliding pair device in the diagram.

[0034] Figure 8 A schematic diagram of the wheel load meter and suspension travel measuring instrument according to an embodiment of the present invention is shown.

[0035] Figure 9 A schematic diagram of a suspension travel measuring instrument according to an embodiment of the present invention is shown.

[0036] Figure 10 A cross-sectional view of a suspension travel measuring instrument according to an embodiment of the present invention is shown.

[0037] Figure 11 A schematic diagram of the fixing device according to an embodiment of the present invention is shown.

[0038] Figure 12 yes Figure 11 A schematic diagram of the positioning base.

[0039] Figure 13 A diagram illustrating the usage state of a suspension spring displacement measuring instrument according to an embodiment of the present invention is shown.

[0040] Figure 14 A schematic diagram of a suspension spring displacement measuring instrument according to an embodiment of the present invention is shown.

[0041] Figure 15 A schematic diagram of the connection structure between the top bracket and the upper limit seat of the suspension spring displacement measuring instrument is shown.

[0042] Figure 16 yes Figure 15 Assembly diagram.

[0043] Figure 17 The diagram shows the relationship between suspension travel distance and unsprung mass.

[0044] Figure 18 A graph showing the relationship between suspension travel distance and vehicle body spring travel distance is presented.

[0045] The above figures include the following reference numerals:

[0046] Spring rocker arm 101

[0047] Wheel 102

[0048] Vibration damper 103

[0049] 104 coil spring

[0050] Wheel 105

[0051] Lift 106

[0052] Spring upper limit seat 107

[0053] Wheel bracket 108

[0054] Suspension vibration performance measurement equipment 200

[0055] Wheel load instrument 201

[0056] Suspension travel measuring instrument 202

[0057] Suspension Spring Displacement Measuring Instrument 203

[0058] Tire pallet 204

[0059] Corner plate 205

[0060] Load measurement sensor 206

[0061] Suction Cup Kit 207

[0062] First wire displacement sensing component 208

[0063] Fixed mechanism 209

[0064] Second wire displacement sensing component 210

[0065] Corner plate cover 211

[0066] Corner plate base 212

[0067] Sliding pair device 213

[0068] 214 socket head cap screws

[0069] Locking washer 215

[0070] 216 ball bearing disc

[0071] Connector 217

[0072] 218 tension spring

[0073] Connecting shaft 219

[0074] Positioning base 220

[0075] Strong Magnet 221

[0076] Wheel to center plate 222

[0077] 223 connecting shafts for the middle plate

[0078] Through slot 224

[0079] First fisheye bearing 225

[0080] Connecting rod 226

[0081] Second fisheye bearing 227

[0082] Mounting base 228

[0083] First wire displacement sensor 229

[0084] Circular Level 230

[0085] Sensor Fixture 231

[0086] Rocker arm fixing clamp 232

[0087] Top bracket 234

[0088] Second wire displacement sensor 235

[0089] Square magnet 236

[0090] Ball bearing 237

[0091] Fixture 238

[0092] Wheel cover 239 Detailed Implementation

[0093] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0094] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0095] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0096] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0097] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0098] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0099] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0100] Figure 2 A diagram illustrating the usage status of a suspension vibration performance measurement device according to an embodiment of the present invention is shown. Figure 3 A diagram illustrating the usage status of a suspension travel measuring instrument according to an embodiment of the present invention is shown. Figure 4 A diagram illustrating the usage status of a suspension vibration performance measurement device according to an embodiment of the present invention is shown. Figure 5 yes Figure 4 A partial schematic diagram is shown. As shown, the present invention provides a suspension vibration performance measuring device 200 suitable for vehicles. The suspension vibration performance measuring device 200 mainly includes a wheel load meter 201, a suspension travel measuring instrument 202, and a suspension spring displacement measuring instrument 203.

[0101] refer to Figures 2 to 5 A wheel load cell 201 is positioned at the bottom of the vehicle wheel 105 to support the wheel 105 and measure its unsprung mass. A suspension travel measuring instrument 202 is positioned on the outer surface of the vehicle wheel arch 239 and the corresponding wheel 105. The suspension travel measuring instrument 202 measures the distance of the vehicle suspension's extension and compression travel, i.e., the vertical displacement of the vehicle wheel 105. A suspension spring displacement measuring instrument 203 is positioned on the upper limit seat 107 of the vehicle body and the spring rocker arm 101, and measures the distance of the compression and extension travel of the body spring during the vehicle suspension's extension and compression travel. The body spring here refers to... Figure 1 The helical spring 104 in the middle.

[0102] refer to Figure 2In the actual measurement process of the suspension vibration performance measuring device 200, the vehicle is smoothly raised from its curb weight standing height to the lower limit of the suspension by the lifting of the lift 106, then smoothly lowered to the upper limit of the suspension, and then the vehicle returns to its curb weight standing height. During the entire measurement cycle, taking a car as an example, four wheels 105 are set up in the front, rear, left, and right directions. A wheel load meter 201 is set at the bottom of each wheel 105, and a suspension travel measuring instrument 202 is set on each wheel 105 and its corresponding wheel hub 102. Conventionally, the front wheels of a car use a MacPherson independent suspension structure, where the shock absorber 103 and coil spring 104 are integrated, so there is no need to measure the travel of the coil spring 104. However, the rear wheels of most cars use a multi-link independent suspension structure, so the suspension spring displacement measuring instrument 203 needs to be placed on the upper limit seat 107 and the spring rocker arm 101 of the vehicle body to measure the compression and extension distances of the coil spring 104 during the extension and compression strokes of the vehicle suspension. If both the front and rear wheels use a multi-link independent suspension structure, then each wheel 105 needs to be equipped with a suspension spring displacement measuring instrument 203 to obtain the travel distance of the corresponding coil spring 104.

[0103] Figure 6 A schematic diagram of a wheel load apparatus according to an embodiment of the present invention is shown. (In conjunction with...) Figures 2 to 5 As shown, the wheel load meter 201 mainly includes a tire tray 204, a turntable 205, and a load measurement sensor 206. The tire tray 204 is mounted on the turntable 205 via the load measurement sensor 206. The tire tray 204 is used to support the wheel 105, and the load measurement sensor 206 is used to measure the unsprung mass.

[0104] Figure 8 A schematic diagram of the wheel load meter and suspension travel measuring instrument according to an embodiment of the present invention is shown. Figure 9 A schematic diagram of a suspension travel measuring instrument according to an embodiment of the present invention is shown. (Combined with...) Figures 2 to 5 As shown, the suspension travel measuring instrument 202 mainly includes a suction cup assembly 207, a fixing device 238, and a first cable displacement sensing component 208. The suction cup assembly 207 is fixed to the vehicle wheel arch 239. The fixing device 238 is fixed to the outer surface of the wheel 105 corresponding to the wheel arch 239. The first cable displacement sensing component 208 is fixed between the suction cup assembly 207 and the fixing device 238, and is used to measure the extension and compression travel distance of the vehicle suspension.

[0105] Figure 13 A diagram illustrating the usage state of a suspension spring displacement measuring instrument according to an embodiment of the present invention is shown. (Combined with...) Figure 4 and Figure 5As shown, the suspension spring displacement measuring instrument 203 mainly includes a fixing mechanism 209 and a second cable displacement sensing assembly 210. The top of the second cable displacement sensing assembly 210 is fixed to the upper limit seat 107 of the vehicle body's spring. The bottom of the second cable displacement sensing assembly 210 is fixed to the vehicle's spring rocker arm 101 via the fixing mechanism 209. The second cable displacement sensing assembly 210 is used to measure the distance of the compression and extension strokes of the vehicle body spring during the extension and compression strokes of the suspension.

[0106] Better, refer to Figure 6 The corner plate 205 includes a corner plate cover 211, a corner plate base 212, and a sliding pair device 213, all coaxially arranged. The corner plate cover 211 covers the corner plate base 212, and the sliding pair device 213 is provided between the corner plate cover 211 and the corner plate base 212. Specifically, the bottom center of the corner plate cover 211 has a downwardly extending connecting shaft 219. The center of the corner plate base 212 has a mounting hole, and the socket head cap screw 214 is inserted into the mounting hole from bottom to top using a hexagonal socket screw 214 and a locking washer 215. The connecting shaft 219 of the corner plate cover 211 is engaged with the top of the socket head cap screw 214 and is axially fixed. This structure, with the cooperation of the sliding pair device 213, allows the corner plate cover 211 and the corner plate base 212 to form a rotational engagement.

[0107] Furthermore, the load measuring sensor 206 is fixedly mounted on the top of the corner plate cover 211, and the tire tray 204 is fixedly mounted on the top of the load measuring sensor 206. The load measuring sensor 206, the corner plate cover 211, and the tire tray 204 are coaxial, meaning that the central axis of the load measuring sensor 206, the tire tray 204, and the corner plate 205 are aligned.

[0108] During actual measurement, when friction occurs between the tire tray 204 and the vehicle tire, the friction force is transmitted from the tire tray 204 to the corner plate cover 211. The corner plate cover 211 rotates relative to the corner plate base 212 via the sliding pair device 213 to absorb the friction force between the vehicle tire and the surface of the tire tray 204 during the vehicle lifting process, ensuring the accurate measurement of the load measurement sensor 206.

[0109] Figure 7 yes Figure 6A schematic diagram of the sliding pair device is shown. As shown, the sliding pair device 213 includes a ball bearing disk 216, a connecting disk 217, and multiple tension springs 218. The ball bearing disk 216 and the connecting disk 217 are annular, with the ball bearing disk 216 positioned around the periphery of the connecting disk 217, and both arranged on the same plane. The inner edge of the ball bearing disk 216 is connected to the outer edge of the connecting disk 217 via tension springs 218. Multiple ball bearings 237 are provided on the ball bearing disk 216. The balls in the ball bearings 237 contact the bottom surface of the corner plate cover 211 or the top surface of the corner plate base 212. The connecting disk 217 is sleeved on the connecting shaft 219 of the corner plate cover 211.

[0110] Figure 10 A cross-sectional view of a suspension travel measuring instrument according to an embodiment of the present invention is shown. Figure 11 A schematic diagram of the fixing device according to an embodiment of the present invention is shown. As shown, preferably, the fixing device 238 of the suspension travel measuring instrument 202 includes a positioning base 220, a plurality of powerful magnets 221, a wheel alignment plate 222, and a alignment plate connecting shaft 223. The plurality of powerful magnets 221 are disposed on the positioning base 220. The powerful magnets 221 are magnetically attracted and fixed to the tire fastening bolts of the vehicle wheel hub 102. Conventionally, the wheel hub 102 of a car has 5 tire fastening bolts, and 5 powerful magnets 221 are correspondingly disposed to fix the positioning base 220 to the outside of the vehicle wheel hub 102. The alignment plate connecting shaft 223 is fixed to the center of the positioning base 220, and the wheel alignment plate 222 is threadedly engaged with the alignment plate connecting shaft 223. The wheel alignment plate 222 is fixedly engaged with the central groove of the vehicle wheel hub 102. Rotating the centering plate connecting shaft 223 can adjust the axial position of the wheel centering plate 222 so that the positioning base 220 is aligned with the vehicle wheel hub 102.

[0111] Figure 12 yes Figure 11 A schematic diagram of the positioning base is shown. Preferably, multiple radially extending through slots 224 are formed on the positioning base 220, and a powerful magnet 221 passes through the through slots 224. The through slots 224 provide redundancy for the powerful magnet 221 in the radial position, ensuring that the entire fixing device 238 is firmly fixed to the vehicle wheel hub 102.

[0112] refer to Figure 10The first cable displacement sensing assembly 208 includes a first fisheye bearing 225, a connecting rod 226, a second fisheye bearing 227, a mounting base 228, and a first cable displacement sensor 229. The first fisheye bearing 225 is fixed to the suction cup assembly 207. One end of the connecting rod 226 is fixed to the first fisheye bearing 225. The second fisheye bearing 227 is fixed to the positioning base 220. One end of the mounting base 228 is fixed to the second fisheye bearing 227. The first cable displacement sensor 229 is fixed to the mounting base 228, and its cable extends upward and is fixed to the other end of the connecting rod 226. It should be noted that the fisheye bearing acts as a universal joint, used to adjust the position of the connecting rod 226 and the mounting base 228. During the installation of the suspension travel measuring instrument 202, the first fisheye bearing 225 and the second fisheye bearing 227 are adjusted to keep the connecting rod 226 and the base of the mounting base 228 parallel.

[0113] Preferably, the first cable displacement sensing assembly 208 further includes a circular level 230 disposed on the first cable displacement sensor 229. The circular level 230 is used to adjust the first cable displacement sensor 229 to a horizontal position. During the installation of the suspension travel measuring instrument 202, in addition to keeping the connecting rod 226 and the base of the mounting base 228 parallel and the first cable displacement sensor 229 in a horizontal position, a right-angle ruler can be used against the cable to adjust the length direction of the cable to the vertical direction.

[0114] Figure 14 A schematic diagram of a suspension spring displacement measuring instrument according to an embodiment of the present invention is shown. Figure 15 A schematic diagram of the connection structure between the top bracket and the upper limit seat of the suspension spring displacement measuring instrument is shown. Figure 16 yes Figure 15 Assembly diagram. Combined with... Figure 13 As shown, the fixing mechanism 209 of the suspension spring displacement measuring instrument 203 includes a sensor fixing clamp 231 and a rocker arm fixing clamp 232. The sensor fixing clamp 231 is used to fix the second cable displacement sensor assembly 210, and the rocker arm fixing clamp 232 is used to fix the sensor fixing clamp 231 to the spring rocker arm 101. More preferably, the fixing mechanism 209 can also be fixed to the spring rocker arm 101 by straps to enhance the overall structural stability.

[0115] Preferably, the second cable displacement sensor assembly 210 includes a top bracket 234 and a second cable displacement sensor 235. The top bracket 234 is fixed to the upper spring seat 107 of the vehicle body. During the installation of the suspension spring displacement measuring instrument 203, the vehicle body spring (coil spring 104) needs to be removed, and the top bracket 234 is fixed to the bottom of the upper spring seat 107 with screws. The second cable displacement sensor 235 is fixed to the sensor fixing clamp 231. The cable of the second cable displacement sensor 235 extends upward and is fixed to the top bracket 234. The position of the suspension spring displacement measuring instrument 203 on the spring rocker arm 101 is adjusted so that the length direction of the cable of the second cable displacement sensor 235 is aligned with the travel direction of the vehicle body spring.

[0116] Preferably, a square magnet 236 is provided on the sensor fixing clamp 231. The square magnet 236 is used to magnetically fix the second wire displacement sensor 235. Since the spring rocker arm 101 has an irregular shape, the magnet can better fix the second wire displacement sensor 235.

[0117] The main features of the suspension vibration performance measuring device provided by this invention are as follows:

[0118] 1. It can shorten the measurement cycle and reduce costs;

[0119] 2. The suspension travel measuring instrument and the suspension spring displacement measuring instrument have high measurement accuracy;

[0120] 3. The use of a sliding pair device in the wheel load meter can avoid measurement errors caused by friction and improve measurement accuracy.

[0121] As mentioned earlier, before using suspension vibration performance measurement equipment, the body springs on the front and rear suspensions of the vehicle need to be removed. Then, the wheel load meter, suspension travel measuring instrument, and suspension spring displacement measuring instrument should be installed according to the front and rear wheels, respectively. (Reference) Figure 2 During the actual measurement process of the suspension vibration performance measuring equipment, the vehicle is smoothly raised from its curb weight standing height to the lower limit of the suspension using a lift, then smoothly lowered to the upper limit of the suspension, and finally returned to its curb weight standing height. Throughout the entire measurement cycle,

[0122] Figure 17The diagram illustrates the relationship between suspension travel distance and unsprung mass. As shown, the horizontal axis represents the distance of the vehicle's suspension extension and compression travel as measured by the suspension travel measuring instrument. The vertical axis represents the unsprung mass measured by the wheel load cell. Taking the measurement results of one tire as an example, when the vehicle's suspension travel distance is 0, that is, starting from the vehicle's curb weight standing height, the corresponding unsprung mass is recorded. Then, the vehicle is raised smoothly until it reaches the lower limit of the suspension, equivalent to the vehicle's suspension travel distance moving from 0 to approximately -60mm to the left, and the corresponding unsprung mass is recorded, forming the left half of the thick black line at the bottom of the diagram. Next, the vehicle is smoothly lowered to the upper limit of the suspension, equivalent to the vehicle's suspension travel distance moving from -60mm to the right to approximately 70mm, and the corresponding unsprung mass is recorded, forming the thick black line at the top of the diagram. Finally, the vehicle is brought back to the curb weight standing height, equivalent to the vehicle's suspension travel distance moving from 70mm to the left to 0mm, forming the right half of the thick black line at the bottom of the diagram. The fitted curve (thin black line) is obtained from the two thick black lines at the top and bottom, expressed as the formula in the figure. From this fitted curve formula, the unsprung mass when the suspension travel distance is 0mm can be obtained, which is approximately 656.16N. The unsprung suspension stiffness is obtained by the ratio of the suspension travel distance to the unsprung mass, which is approximately 5.3301. The suspension stiffness can then be calculated by obtaining the stiffness of the vehicle body springs. It should be noted that the curves for the vehicle suspension extension and compression travel do not coincide because of hysteresis, i.e., suspension friction.

[0123] Figure 18 A graph showing the relationship between suspension travel distance and vehicle body spring travel distance is presented. As shown in the figure, the horizontal axis represents the distance of the vehicle suspension's extension and compression travel as measured by the suspension travel measuring instrument. The vertical axis represents the travel distance of the vehicle body springs as measured by the suspension spring displacement measuring instrument. Combined with... Figure 17 The data, through formula calculations, can yield data such as the unsprung vertical stiffness ratio, the natural frequency of the unsprung mass, the natural frequency of the sprung mass, the unsprung mass deflection frequency, and the sprung mass deflection frequency. These data all belong to the vibration performance parameters of the suspension system and are of significant reference value for evaluating the ride comfort of the entire vehicle.

[0124] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A suspension vibration performance measuring device, suitable for vehicles, comprising: A wheel load cell includes a tire tray, a swivel disc, and a load measurement sensor. The tire tray is mounted on the swivel disc via the load measurement sensor and is used to support the tire. The load measurement sensor is used to measure the unsprung mass. The swivel disc includes a swivel disc cover, a swivel disc base, and a sliding pair device arranged coaxially. The swivel disc cover is fitted onto the swivel disc base, and the sliding pair device is provided between the swivel disc cover and the swivel disc base. The load measurement sensor is fixedly mounted on the top of the swivel disc cover. A suspension travel measuring instrument includes a suction cup assembly, a fixing device, and a first cable displacement sensing component. The suction cup assembly is fixed to the wheel arch of the vehicle, and the fixing device is fixed to the outer surface of the wheel corresponding to the wheel arch. The first cable displacement sensing component is fixed between the suction cup assembly and the fixing device. The first cable displacement sensing component is used to measure the distance of the extension and compression travel of the vehicle suspension. The fixing device includes a positioning base, multiple strong magnets, a wheel alignment plate, and a alignment plate connecting shaft. The multiple strong magnets are disposed on the positioning base for magnetically fixing to the tire fastening bolts of the wheel hub. A suspension spring displacement measuring instrument includes a fixing mechanism and a second cable displacement sensing component. The top of the second cable displacement sensing component is fixed to the upper limit seat of the spring on the vehicle body, and the bottom of the second cable displacement sensing component is fixed to the spring rocker arm of the vehicle through the fixing mechanism. The second cable displacement sensing component is used to measure the distance of the compression and extension stroke of the body spring during the extension and compression stroke of the vehicle suspension. A wheel load meter is provided at the bottom of each wheel of the vehicle, and a suspension travel measuring instrument is provided on each wheel and the corresponding hub. The suspension spring displacement measuring instrument is used to obtain the travel distance of the corresponding coil spring. The upper cover of the corner plate rotates relative to the base of the corner plate by means of a sliding pair device to absorb the friction between the surface of the vehicle tire and the tire tray during the lifting and lowering of the vehicle.

2. The suspension vibration performance measuring device as described in claim 1, characterized in that, The tire tray is fixedly mounted on top of the load measuring sensor. The load measuring sensor, the corner plate cover, and the tire tray are coaxial. When friction occurs between the tire tray and the vehicle tire, the tire tray drives the corner plate cover to rotate relative to the corner plate base via the sliding pair device. The sliding pair device includes a ball bearing, a connecting plate, and multiple tension springs. The ball bearing and the connecting plate are annular. The ball bearing is located around the connecting plate. The inner edge of the ball bearing is connected to the outer edge of the connecting plate via the tension springs. Multiple ball bearings are provided on the ball bearing. The balls in the ball bearings contact the bottom surface of the corner plate cover or the top surface of the corner plate base. The connecting plate is sleeved on the connecting shaft of the corner plate cover.

3. The suspension vibration performance measuring device as described in claim 1, characterized in that, The centering disc connecting shaft is fixed to the center of the positioning base. The wheel centering disc is threadedly engaged with the centering disc connecting shaft, and the wheel centering disc is fixedly engaged with the central groove of the wheel hub. Multiple radially extending through slots are formed on the positioning base, and the powerful magnet passes through the through slots. The first pull-wire displacement sensing assembly includes a first fisheye bearing, a connecting rod, a second fisheye bearing, a mounting base, and a first pull-wire displacement sensor. The first fisheye bearing is fixed to the suction cup assembly. One end of the connecting rod is fixed to the first fisheye bearing. The second fisheye bearing is fixed to the positioning base. One end of the mounting base is fixed to the second fisheye bearing. The first pull-wire displacement sensor is fixed to the mounting base, and the pull wire of the first pull-wire displacement sensor is fixed to the other end of the connecting rod.

4. The suspension vibration performance measuring device as described in claim 1, characterized in that, The first draw wire displacement sensing component also includes a circular level disposed on the first draw wire displacement sensor.

5. The suspension vibration performance measuring device as described in claim 1, characterized in that, The fixing mechanism includes a sensor fixing clamp and a rocker arm fixing clamp. The sensor fixing clamp is used to fix the second pull wire displacement sensor assembly, and the rocker arm fixing clamp is used to fix the sensor fixing clamp to the spring rocker arm.

6. The suspension vibration performance measuring device as described in claim 5, characterized in that, The second cable displacement sensor assembly includes a top bracket and a second cable displacement sensor. The top bracket is fixed to the upper limit seat of the spring on the vehicle body, and the second cable displacement sensor is fixed to the sensor fixing clamp.

7. The suspension vibration performance measuring device as described in claim 6, characterized in that, A magnet is provided on the sensor fixing clamp for magnetically fixing the second wire displacement sensor.

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