CN112254990A - Durability test device and method for shock absorber assembly - Google Patents

Abstract

The embodiment of the application provides a durability test device and method for a shock absorber assembly, and relates to the technical field of test equipment. The durability test device of the shock absorber assembly comprises an actuating assembly, a force transmission rod assembly and a shock absorber connecting block; the actuating assembly comprises a first actuator, a second actuator and a third actuator which are mutually orthogonal, the third actuator is arranged in the vertical direction, and the first actuator and the second actuator are arranged in the horizontal direction; the shock absorber connecting block is arranged between the first actuator and the shock absorber assembly, the axial direction of the third actuator is the same as that of the shock absorber assembly, and the shock absorber connecting block is respectively connected with the first actuator, the second actuator and the third actuator through a dowel bar assembly. The shock absorber assembly endurance test device can be loaded from three mutually orthogonal directions, and can reproduce the actual stress of the shock absorber assembly, so that the shock absorber assembly endurance test or the reliability test can be better carried out.

Description

Durability test device and method for shock absorber assembly

Technical Field

The application relates to the technical field of test equipment, in particular to a durability test device and method for a shock absorber assembly.

Background

At present, in the performance test equipment of the shock absorber, the shock absorber is generally arranged on a test bench, and the bench drives the upper end and the lower end of the shock absorber to do simple harmonic motion with specified frequency; or receiving a road spectrum reliability test, and reproducing the real-vehicle action of the shock absorber on the rack according to the relative displacement of the shock absorber piston rod and the oil storage end acquired by the real vehicle. In both tests, the relative movement of the piston rod of the shock absorber and the oil storage end is controlled, so that the durability test is carried out. Some test benches in the industry will increase the shock absorber side force based on the above test method, but the side force is often a fixed load.

In the prior art, when an automobile runs, a lateral force is often required to act on the automobile, for example, a shock absorber assembly supporting a cab of the truck swings forwards and backwards and leftwards and rightwards relative to a frame along with the cab, and the shock absorber assembly can bear a large lateral force. For example, a shock absorber assembly in a mcpherson suspension can also bear a certain lateral force under the action of a longitudinal force of a wheel. If the lateral force cannot be loaded well in the test process, the practical use condition of the shock absorber assembly cannot be faithfully reproduced, and defects existing in the shock absorber assembly cannot be found through tests.

Disclosure of Invention

The embodiment of the application aims to provide a shock absorber assembly endurance test device and a shock absorber assembly endurance test method, wherein the shock absorber assembly endurance test device can be loaded from three mutually orthogonal directions, can reproduce the actual vehicle stress of the shock absorber assembly, and can better perform the shock absorber assembly endurance test or reliability test.

In a first aspect, an embodiment of the present application provides a durability test device for a shock absorber assembly, which includes an actuating assembly, a force transmission rod assembly, and a shock absorber connecting block;

the actuating assembly comprises a first actuator, a second actuator and a third actuator which are mutually orthogonal, the third actuator is arranged in the vertical direction, and the first actuator and the second actuator are arranged in the horizontal direction;

the shock absorber connecting block is arranged between the first actuator and the shock absorber assembly, the axial direction of the third actuator is the same as that of the shock absorber assembly, and the shock absorber connecting block is respectively connected with the first actuator, the second actuator and the third actuator through a dowel bar assembly.

In the implementation process, the durability test device of the shock absorber assembly can be loaded from three mutually orthogonal directions, and can reproduce the stress of the shock absorber assembly on a real vehicle, so that the stress and motion conditions of the shock absorber assembly on the real vehicle are reproduced; for example, the relative motion between the piston rod of the shock absorber and the oil reservoir can be reproduced, and the side load of the shock absorber assembly in the direction perpendicular to the axis can be reproduced, so that the durability test or the reliability test of the shock absorber assembly can be better carried out.

Furthermore, the device also comprises a first actuator fixing seat, a first suspension bracket, a second actuator fixing seat and a second suspension bracket;

the first actuator fixing seat is connected with a first end of the first actuator through a spherical hinge, and the first suspension bracket is arranged at a second end of the first actuator and is connected with the first actuator through a spring;

the second actuator fixing base with the first end of second actuator is passed through the ball pivot and is connected, the second hang support set up in the second end of second actuator, through the spring with the second actuator is connected.

In the implementation process, the first actuator fixing seat and the first suspension bracket are used for installing and setting the first actuator, the first actuator fixing seat is connected with the first actuator through a spherical hinge, and the first suspension bracket is connected with the first actuator through a spring; the second actuator fixing seat and the second suspension support are used for installing and setting a second actuator, the second actuator fixing seat is connected with the second actuator through a spherical hinge, and the second suspension support is connected with the second actuator through a spring.

Further, the device further comprises a first force sensor, a first guide bar, a second force sensor and a second guide bar, the dowel bar assembly comprises a first dowel bar and a second dowel bar;

the second end of the first actuator, the first force sensor, the first guide rod and the first force transmission rod are sequentially connected with the shock absorber connecting block, and a spherical hinge is arranged between the first guide rod and the first force transmission rod;

the second end of the second actuator, the second force sensor, the second guide rod and the second dowel bar are sequentially connected with the shock absorber connecting block, and a spherical hinge is arranged between the second guide rod and the second dowel bar.

In the implementation process, a first force sensor, a first guide rod and a first force transmission rod are sequentially connected between a first actuator and a shock absorber connecting block, so that a lateral force is loaded to a shock absorber assembly through the first actuator; and a second force sensor, a second guide rod and a second dowel bar are sequentially connected between the second actuator and the shock absorber connecting block, so that the lateral force in the other direction is loaded to the shock absorber assembly through the second actuator.

Furthermore, the device also comprises a first guide fixing seat, a first guide universal bearing, a second guide fixing seat and a second guide universal bearing;

the first guide fixing seat is arranged on the side of the first guide rod, an inner ring of the first guide universal bearing is nested in the first guide rod, and the first guide universal bearing is fixed on the first guide fixing seat;

the second guide fixing seat is arranged on the side of the second guide rod, an inner ring of the second guide universal bearing is nested on the second guide rod, and the second guide universal bearing is fixed on the second guide fixing seat.

In the implementation process, the first guide rod is installed and arranged through the first guide fixing seat and the first guide universal bearing, and the second guide rod is installed and arranged through the second guide fixing seat and the second guide universal bearing.

Furthermore, the first dowel bar, the second dowel bar and the third dowel bar are respectively and fixedly connected with the shock absorber connecting block, the revolute pair or connected through a spherical hinge.

In the implementation process, aiming at different types of shock absorber assemblies and structures thereof, the first force transmission rod and the second force transmission rod can respectively adopt different connection modes with the shock absorber connecting block so as to achieve the best effect of reproducing the stress and motion conditions of the shock absorber assemblies on a real vehicle.

Further, the device also comprises a shock absorber assembly fixing seat, wherein a fixing clamp is arranged on the shock absorber assembly fixing seat, and the shock absorber assembly is installed on the shock absorber assembly fixing seat through the fixing clamp.

In the implementation process, the shock absorber assembly is installed on the shock absorber assembly fixing seat through the shock absorber assembly fixing clamp.

Furthermore, the device also comprises a portal frame, the third actuator is hung on the portal frame, and the first end of the third actuator is connected with the top beam of the portal frame through a spherical hinge.

In the implementation process, the portal frame is used for installing and arranging a third actuator; optionally, the gantry is provided with a top beam and a cross beam.

Further, the apparatus further comprises a third guide bar and a third force sensor, the dowel bar assembly comprising a third dowel bar;

the second end of the third actuator, the third guide rod, the third dowel bar and the third force sensor are sequentially connected with the shock absorber connecting block, and a spherical hinge is arranged between the third guide rod and the third dowel bar.

In the implementation process, a third guide rod, a third force transmission rod and a third force sensor are sequentially connected between a third actuator and the shock absorber connecting block, so that longitudinal force is loaded to the shock absorber assembly through the third actuator.

In the implementation process, aiming at different types of shock absorber assemblies and structures thereof, the third dowel bars and the shock absorber connecting blocks can adopt different connecting modes respectively so as to achieve the best effect of reproducing the stress and motion conditions of the shock absorber assemblies on a real vehicle.

Furthermore, the device also comprises a third guiding universal bearing, an inner ring of the third guiding universal bearing is nested on the third guiding rod, and the third guiding universal bearing is fixed on a cross beam of the portal frame.

In the implementation process, a third guide rod is installed and arranged through a cross beam of the portal frame and a third guide universal bearing.

In a second aspect, an embodiment of the present application further provides a shock absorber assembly endurance testing method, which is applied to the shock absorber assembly endurance testing apparatus described in any one of the above embodiments, and the method includes:

receiving road spectrum acquisition data, wherein the road spectrum acquisition data comprises a first sensor acquisition signal in the operation process of the shock absorber assembly;

driving the actuating component according to the road spectrum acquisition data;

receiving a second sensor acquisition signal of the actuating assembly;

and adjusting the operating parameters of the actuating assembly so that the error between the signal collected by the second sensor and the signal collected by the first sensor is within a preset interval.

Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a durability testing apparatus for a shock absorber assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a first loading direction portion of an endurance testing apparatus for a shock absorber assembly according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a second loading direction portion of an endurance testing apparatus for a shock absorber assembly according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a third loading direction portion of an endurance testing apparatus for a shock absorber assembly according to an embodiment of the present application;

fig. 5 is a schematic flow chart of a durability test method for a shock absorber assembly according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or a point connection; either directly or indirectly through intervening media, or may be an internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.

The embodiment of the application provides a device and a method for durability test of a shock absorber assembly, which can be applied to the durability test of the shock absorber assembly; the durability test device of the shock absorber assembly can be loaded from three mutually orthogonal directions, and can reproduce the stress of the shock absorber assembly on a real vehicle, so that the stress and motion conditions of the shock absorber assembly on the real vehicle are reproduced; for example, the relative motion between the piston rod of the shock absorber and the oil reservoir can be reproduced, and the side load of the shock absorber assembly in the direction perpendicular to the axis can be reproduced, so that the durability test or the reliability test of the shock absorber assembly can be better carried out.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a durability testing apparatus for a shock absorber assembly according to an embodiment of the present disclosure, where the durability testing apparatus for a shock absorber assembly includes an actuating assembly, a force transmission rod assembly, a shock absorber connecting block 100, and a shock absorber assembly 80.

Illustratively, the actuating assembly includes a first actuator 41, a second actuator 42, and a third actuator 43 that are orthogonal to each other, with the third actuator 43 being disposed vertically and the first actuator 41 and the second actuator 42 being disposed horizontally.

Illustratively, the damper connecting block 100 is disposed between the first actuator 41 and the damper assembly 80, the axial direction of the third actuator 43 is the same as the axial direction of the damper assembly 80, and the damper connecting block 100 is connected to the first actuator 41, the second actuator 42, and the third actuator 43 through the dowel assemblies, respectively.

In some embodiments, the shock absorber assembly endurance testing device can be loaded from three mutually orthogonal directions of the first actuator 41, the second actuator 42 and the third actuator 43, and can reproduce the real vehicle stress of the shock absorber assembly, so as to reproduce the stress and motion of the shock absorber assembly on the real vehicle; for example, the relative motion between the piston rod of the shock absorber and the oil reservoir can be reproduced, and the side load of the shock absorber assembly in the direction perpendicular to the axis can be reproduced, so that the durability test or the reliability test of the shock absorber assembly can be better carried out.

Exemplarily, the durability test device for the damper assembly further comprises a damper assembly fixing seat 90, wherein a fixing clamp 160 is arranged on the damper assembly fixing seat 90, and the damper assembly 80 is mounted on the damper assembly fixing seat 90 through the fixing clamp 160.

Illustratively, damper assembly 80 is mounted to damper assembly mount 90 by damper assembly mounting fixture 160.

Illustratively, the durability testing device for the shock absorber assembly further comprises a portal frame 10, a third actuator 43 is suspended on the portal frame 10, and a first end of the third actuator 43 is connected with a top beam 130 of the portal frame 10 through a third actuator spherical hinge 143.

Illustratively, the gantry 10 is used for mounting and arranging a third actuator 43; optionally, the gantry 10 is provided with a top beam 130 and a cross beam 20, the third actuator 43 is suspended on the top beam 130, the gantry 10 and the third actuator 43 are in the same plane, and the cross beam 20 is arranged laterally to the third actuator 43.

In some embodiments, the actuating assembly is an electro-hydraulic servo actuator, wherein the electro-hydraulic servo actuator is provided with a displacement sensor for detecting the displacement between the piston rod and the cylinder body, and a force sensor for detecting the push-pull force on the piston rod.

Referring to fig. 2 and fig. 3, fig. 2 is a schematic structural view of a first loading direction portion of a durability testing apparatus for a shock absorber assembly provided in an embodiment of the present application, and fig. 3 is a schematic structural view of a second loading direction portion of the durability testing apparatus for a shock absorber assembly provided in the embodiment of the present application.

Illustratively, the durability testing device of the damper assembly further comprises a first actuator fixing seat 31, a first suspension bracket 61, a second actuator fixing seat 32 and a second suspension bracket 62; the first actuator fixing seat 31 is connected with a first end of the first actuator 41 through a first actuator spherical hinge 141, the first suspension bracket 61 is arranged at a second end of the first actuator 41 and is connected with the first actuator 41 through a first suspension spring 191; the second actuator fixing base 32 is connected to a first end of the second actuator 42 through a second actuator ball joint 142, and the second suspension bracket 62 is disposed at a second end of the second actuator 42 and connected to the second actuator 42 through a second suspension spring 192.

Illustratively, the first actuator fixing seat 31 and the first suspension bracket 61 are used for installing and arranging the first actuator 41, the first actuator fixing seat 31 is connected with the first actuator 41 through a spherical hinge, and the first suspension bracket 61 is connected with the first actuator 41 through a spring; the second actuator fixing seat 32 and the second suspension bracket 62 are used for installing and arranging the second actuator 42, the second actuator fixing seat 32 is connected with the second actuator 42 through a spherical hinge, and the second suspension bracket 62 is connected with the second actuator 42 through a spring.

Illustratively, the durability testing device of the shock absorber assembly further comprises a first force sensor 181, a first guide rod 121, a second force sensor 182 and a second guide rod 122, wherein the dowel bar assembly comprises a first dowel bar 71 and a second dowel bar 72; the second end of the first actuator 41, the first force sensor 181, the first guide rod 121 and the first force transmission rod 71 are sequentially connected with the shock absorber connecting block 100, and a first guide rod front end spherical hinge 171 is arranged between the first guide rod 121 and the first force transmission rod 71; the second end of the second actuator 42, the second force sensor 182, the second guide rod 122, and the second dowel bar 72 are sequentially connected to the shock absorber connecting block 100, and a second guide rod front end spherical hinge 172 is disposed between the second guide rod 122 and the second dowel bar 72.

Illustratively, between the first actuator 41 and the shock absorber connecting block 100, a first force sensor 181, a first guide rod 121 and a first force transmission rod 71 are connected in sequence, so that a lateral force is applied to the shock absorber assembly 80 through the first actuator 41; between the second actuator 42 and the shock absorber connecting block 100, the second force sensor 182, the second guide rod 122, and the second force transmission rod 72 are connected in sequence, so that the lateral force in the other direction is applied to the shock absorber assembly 80 through the second actuator 42.

Exemplarily, the durability test device of the shock absorber assembly further comprises a first guide fixing seat 51, a first guide universal bearing 111, a second guide fixing seat 52 and a second guide universal bearing 112; the first guide fixing seat 51 is arranged at the side of the first guide rod 121, the inner ring of the first guide universal bearing 111 is nested in the first guide rod 121, the first guide universal bearing 111 is fixed on the first guide fixing seat 51, specifically, the first guide universal bearing 111 is fixed on the first guide mounting plate 151, and the first guide mounting plate 151 is fixed with the first guide fixing seat 51; the second guide fixing seat 52 is disposed on a side of the second guide rod 122, an inner ring of the second guide universal bearing 112 is nested in the second guide rod 122, the second guide universal bearing 112 is fixed on the second guide fixing seat 52, specifically, the second guide universal bearing 112 is fixed on the second guide mounting plate 152, and the second guide mounting plate 152 is fixed with the second guide fixing seat 52.

Illustratively, the first guide rod 121 is installed and disposed through the first guide fixing seat 51 and the first guide universal bearing 111, and the first guide rod 122 is installed and disposed through the second guide fixing seat 52 and the second guide universal bearing 112.

Illustratively, the first force transmission rod 71, the second force transmission rod 72 and the third force transmission rod 73 are fixedly connected with the shock absorber connecting block 100, are connected with the revolute pair or are connected with the revolute pair through a spherical hinge respectively.

For example, for different types of shock absorber assemblies and structures thereof, the first force transmission rod 71, the second force transmission rod 72, and the third force transmission rod 73 and the shock absorber connecting block 100 can respectively adopt different connecting modes, so as to achieve the best effect of reproducing the stress and motion conditions of the shock absorber assembly 80 on a real vehicle.

Referring to fig. 4, fig. 4 is a schematic structural view of a third loading direction portion of the durability test apparatus for a shock absorber assembly according to the embodiment of the present application.

Illustratively, the durability testing apparatus of the damper assembly further comprises a third guide rod 123 and a third force sensor 183, the dowel assembly comprises a third dowel 73; the second end of the third actuator 43, the third guide rod 123, the third dowel bar 73 and the third force sensor 183 are sequentially connected with the shock absorber connecting block 100, and a third guide rod front end spherical hinge 173 is arranged between the third guide rod 123 and the third dowel bar 73.

Illustratively, a third guide rod 123, a third force transmission rod 73 and a third force sensor 183 are connected in sequence between the third actuator 43 and the shock absorber connecting block 100, so that a longitudinal force is applied to the shock absorber assembly 80 through the third actuator 43.

Illustratively, the durability test device for the shock absorber assembly further comprises a third guide universal bearing 113, an inner ring of the third guide universal bearing 113 is nested in the third guide rod 123, and the third guide universal bearing 113 is fixed on the cross beam 20 of the gantry 10.

Illustratively, the third guide rod 123 is mounted and disposed through the beam 20 of the gantry 10 and the third guide gimbal bearing 113.

In some embodiments, the damper assembly fixing seats 90 and the damper connecting blocks 100 need to be changed according to the structure of the damper assembly 80. Alternatively, if the upper end of the piston rod of the shock absorber assembly 80 is fixedly connected with the vehicle body, a ball hinge connection is required between the shock absorber connecting block 100 and the three dowel bars in the shock absorber assembly endurance testing device, so that the motion interference is avoided. If the upper end of the piston rod of the shock absorber assembly 80 is connected with the vehicle body through an elastic element such as rubber, in the first form of the shock absorber assembly durability test device, the shock absorber connecting block 100 is fixedly connected with the third dowel bar 73, and the shock absorber connecting block 100 is respectively connected with the first dowel bar 71 and the first dowel bar 72 in a spherical hinge manner; in the second form, the shock absorber connecting block 100 is connected with the third dowel bar 73 in a spherical hinge mode, the shock absorber connecting block 100 is fixedly connected with one of the two dowel bars perpendicular to the axial direction of the shock absorber assembly 80 and is connected with the other dowel bar revolute pair, and the axial line of the revolute pair is the same as that of the shock absorber assembly.

With reference to fig. 1 to 4, the installation of the shock absorber assembly endurance testing apparatus is described as follows:

the first actuator 41 is connected to the first actuator holder 31 through the first actuator spherical hinge 141, and the first actuator holder 31 is connected to the iron platform. The first actuator front end cylinder body is connected to the first actuator suspension bracket 61 through the first suspension spring 191, and the first actuator suspension bracket 61 is fixed to the iron platform, so that the weight of the first actuator is borne by the first actuator fixing seat 31 and the first suspension spring 191. When the first actuator 41 is installed, it is necessary to ensure that the axis of the first actuator 41 is horizontal in a free state, and the front end of the first actuator is at the same height as the first guiding universal bearing 111, so that after the front end of the first actuator 41 is connected with the first guiding rod 121, the first guiding rod 121 is matched with the first guiding universal bearing 111 in a sliding pair manner so as to limit the swinging of the first actuator 41. The first guide universal bearing 111 is fixed on the first guide fixing seat 51 through the first guide mounting plate 151, and the first guide fixing seat 51 is mounted on the iron platform. Since the weight of the first actuator 41 is borne by the first suspension spring 191 and the first actuator holder 31, the first guide gimbal bearings 111 do not apply a lateral force to the first actuator 41 in the absence of an external force.

The first guide rod 121 is connected to the first power transmission rod 71 by a first guide rod front end spherical hinge 171. The first transmission rod 71 is connected with the shock absorber connecting block 100 through a rotating pair, and the axis of the rotating pair is superposed with the axis of the shock absorber assembly 80.

Similarly, the second actuator 42 is connected to the second actuator mounting 32 by a second actuator ball joint 142, and the second actuator mounting 32 is connected to the iron platform. The front cylinder of the second actuator 42 is connected to the second actuator suspension bracket 62 by the second suspension spring 192, and the second actuator suspension bracket 62 is fixed to the iron platform, so that the weight of the second actuator 42 is borne by the second actuator fixing base 32 and the second suspension spring 192. When the second actuator 42 is installed, it is necessary to ensure that the axis of the second actuator is horizontal in a free state and the front end of the second actuator is at the same height as the second guiding universal bearing 112, so that after the front end of the second actuator 42 is connected with the second guiding rod 122, the second guiding rod 122 is matched with the second guiding universal bearing 112 in a sliding pair manner so as to limit the swinging of the second actuator 42. The second guiding universal bearing 112 is fixed on the second guiding fixing seat 52 through the second guiding mounting plate 152, and the second guiding fixing seat 52 is mounted on the iron platform. Since the weight of the second actuator 42 is borne by the second suspension spring 192 and the second actuator holder 52, the second guide gimbal bearing 112 does not apply a lateral force to the second actuator 42 in the absence of an external force.

The second guide rod 122 is connected to the second force-transmitting rod 72 by a second guide rod front end spherical hinge 172. The second dowel 72 is fixedly connected with the shock absorber connecting block 100.

The third actuator 43 is suspended from the top beam 130 of the gantry 10 by a third actuator ball joint 143. The front end of the third actuator 43 is connected to a third guide rod 123. During installation, it is necessary to ensure that the axis of the third actuator 43 coincides with the axis of the damper assembly 80, and the third guide rod 123 cooperates with the third guide universal bearing 113 sliding pair to limit the swing of the third actuator 43. The third guide gimbal bearing 113 is connected to the beam 20 of the gantry 10. The gantry 10 is fixed on an iron platform. The third guide rod 123 is connected to the third dowel 73 by a third guide rod front end ball pivot 173. A third force sensor 183 is attached to the front end of the third dowel bar 73. Third force sensor 183 is in turn connected to shock absorber connecting block 100 by connecting block ball joint 200.

The first guide universal bearing 111, the second guide universal bearing 112 and the third guide universal bearing 113 have the same structure, and include two parts: the guide universal bearing comprises a guide universal bearing seat and a guide universal bearing inner ring. The guide universal bearing seat is matched with the inner ring of the guide universal bearing through a spherical surface, and the inner ring of the bearing can freely rotate around any direction in the bearing seat. The through hole on the bearing inner ring and the guide rod form a sliding pair, the guide rod can move in the through hole, and lubricating oil is added to the contact surface when the bearing is used, so that the friction force is reduced. The guide universal bearing with the structure is used because the guide universal bearing can avoid the locking phenomenon of the guide rod caused by installation errors.

The lengths of the three force transmission rods need to be designed according to the movement amount of the shock absorber assembly 80 which may occur in each direction in the test process. For example, during the test, the first force transmission rod 71 and the first guide rod 121 connected with the first force transmission rod are relatively swung, the force monitored by the force sensor arranged behind the first force transmission rod 71 is not equal to the force on the force transmission rod, and the force monitored by the force sensor is equal to the force on the force transmission rod only when the swinging angle of the force transmission rod and the guide rod is small.

A first guide rod 121, a first guide rod front end spherical hinge 171, a first transmission rod 71 and a shock absorber connecting block 100 are connected between the first force sensor 181 and the shock absorber assembly 80, the same parts are also arranged between the second force sensor 182 and the shock absorber assembly 80, and a connecting block spherical hinge 200 and a shock absorber connecting block 100 are also arranged between the third force sensor 183 and the shock absorber assembly 80. At higher frequencies of motion of the damper assembly 80, the force sensor is influenced to monitor the force of the transfer rod on the damper assembly by the inertia forces of the components mounted between the damper assembly 80 and the force sensor. In order to overcome the defect, an acceleration sensor can be respectively arranged on the three force sensors, the acceleration sensor detects the acceleration of the force sensor along the extension and contraction direction of the piston rod of the actuator, and the acceleration approximately reflects the acceleration of the guide rod, the spherical hinge at the front end of the guide rod, the force transmission rod and the shock absorber connecting block in the extension and contraction direction of the piston rod of the actuator. Then, in the control system, for the first actuator 41 and the second actuator 42, subtracting the product of the sum of the masses of the guide rod, the spherical hinge at the front end of the guide rod, the dowel bar and the connecting block of the shock absorber and the acceleration from the force value detected by the force sensor; for the third actuator 43, the force value detected by the force sensor is subtracted by the product of the acceleration and the sum of the masses of the shock absorber connecting block and the connecting block ball joint. The force value detected by the force sensor is corrected, and the acting force of the dowel bar on the shock absorber through the shock absorber connecting block is obtained.

In some embodiments, the upper end of the piston rod of shock absorber assembly 80 is connected to the vehicle body by a rubber shock block. When the durability test device for the shock absorber assembly is used for testing the shock absorber assembly 80 in the form, the specific flow is as follows:

firstly, road spectrum collection is carried out, and displacement signals between a piston rod and an oil storage cylinder of the shock absorber assembly 80 and force signals in three directions at the joint of the top end of the shock absorber assembly 80 and a vehicle body in the running process of the vehicle are collected. Optionally, for the force condition acquisition of the shock absorber assembly 80, the vehicle body part is modified at the position where the top end of the shock absorber assembly 80 is connected with the vehicle body, so that the three-way force sensor is installed at the top end of the shock absorber assembly 80 and then connected with the modified vehicle body part. Aiming at the displacement signal acquisition between the piston rod of the shock absorber assembly 80 and the oil storage cylinder, a stay wire type displacement sensor is arranged between the top end of the shock absorber assembly and the oil storage cylinder. And finally, acquiring signals of the three-way force sensor and signals of the stay wire type displacement sensor through a data acquisition instrument. And the data are used as input parameters of the durability test device of the shock absorber assembly after conventional operations such as filtering, deburring and drift removal.

Second, a durability test was performed, and the damper assembly 80 was mounted in the damper assembly durability test apparatus. In the damper assembly durability test apparatus, the first actuator 41, the second actuator 42, and the third actuator 43 are active elements that apply load to the damper assembly 80. The three actuators load the damper assembly 80 from three mutually orthogonal directions, with the third actuator 43 loading the damper assembly 80 in the axial direction thereof. It should be noted that, there is the displacement sensor who detects the relative displacement between its own piston rod and the cylinder body inside three actuators, and displacement sensor links to each other with the controller, and that is to say, the flexible volume of actuator is by real-time supervision. The front ends of the piston rods of the first actuator 41 and the second actuator 42 are respectively provided with a first force sensor 181 and a second force sensor 182, and a third force sensor 183 of the third actuator 43 is arranged at the front end of the third dowel steel 73. The three force sensors are connected with the controller, and the output force of the actuator can be monitored in real time.

In the test process, the driving signals of the three actuators are continuously adjusted, so that the corrected force value signals of the three force sensors are respectively close to the force value signals of the three directions acquired by the road spectrum acquisition, and the displacement of the piston rod of the third actuator is also close to the relative displacement between the piston rod of the shock absorber and the oil storage cylinder in the road spectrum acquisition. Then, the damper assembly is driven to perform a test a predetermined number of times or for a predetermined time in accordance with the drive signal of the actuator in this state.

In some embodiments, the upper end of the piston rod of the shock absorber assembly 80 is fixedly connected with the vehicle body, and when the shock absorber assembly is tested in the form of the shock absorber assembly, the durability test device of the shock absorber assembly is applied in the same test method as that when the upper end of the piston rod of the shock absorber assembly 80 is connected with the vehicle body through the rubber shock absorption block; however, the first transfer rod 71 and the second transfer rod 72 are both connected to the damper attachment block 100 by a ball joint centered on the axis of the damper assembly 80.

In some embodiments, the road spectrum acquisition phase acquires a displacement signal between a piston rod and a reservoir of the shock absorber assembly 80 and a strain signal around the reservoir at the bottom end of the shock absorber assembly during vehicle operation. The stress states of the shock absorber assembly 80 in three directions are reflected by strain signals around the oil storage cylinder; in the test stage, the shock absorber assembly test device monitors the relative displacement signal of the piston rod of the third actuator 43 and the cylinder body of the actuator in real time while driving the shock absorber assembly 80 through the three dowel bars, and the displacement signal reflects the displacement between the piston rod of the shock absorber and the oil storage cylinder. The control system also monitors the strain signals around the oil storage cylinder at the bottom end of the shock absorber in real time and continuously adjusts the driving signals of the three actuators until the four monitored signals and the signals collected by the road spectrum reach acceptable approaching degree. Then, the damper assembly is driven to perform a test a predetermined number of times or for a predetermined time in accordance with the drive signal of the actuator in this state.

Referring to fig. 5, fig. 5 is a schematic flow chart of a durability test method for a shock absorber assembly according to an embodiment of the present application.

The durability test method for the shock absorber assembly provided by the embodiment of the application is applied to the durability test device for the shock absorber assembly shown in fig. 1 to 4, and comprises the following steps:

step S100: receiving road spectrum acquisition data, wherein the road spectrum acquisition data comprises a first sensor acquisition signal in the operation process of the shock absorber;

step S200: driving an actuating component according to road spectrum acquisition data;

step S300: receiving a second sensor acquisition signal of the actuating component;

step S400: and adjusting the operating parameters of the actuating assembly so that the error between the signal collected by the second sensor and the signal collected by the first sensor is within a preset interval.

Illustratively, the shock absorber assembly durability test method is used for development verification of the shock absorber assembly 80, and for verifying the durability and reliability of the shock absorber assembly 80.

The first sensor acquisition signal is acquired by a sensor installed on the vehicle in real vehicle operation; optionally, the first sensor may collect signals through a three-axis force sensor and a displacement sensor mounted on the vehicle, or through a displacement sensor and a strain gauge; it should be understood that the specific sensing device used by the first sensor to collect signals is merely exemplary and not limiting, and the signals collected by the first sensor may also be collected by other forms of sensing devices.

Illustratively, the second sensor acquisition signal is a signal acquired by a sensor mounted on the shock absorber assembly endurance testing apparatus during operation of the apparatus; optionally, the signal acquired by the second sensor can be acquired through a strain gauge arranged on an oil storage cylinder of the shock absorber; it should be understood that the specific sensing device for the second sensor to acquire signals is only an example and not a limitation, and the second sensor to acquire signals may also adopt other forms of sensing devices to acquire signals.

For example, compared with the prior art, the device and the method for testing the durability of the shock absorber assembly provided by the embodiment can reproduce the stress and motion conditions of the shock absorber assembly 80 on a real vehicle; specifically, the relative movement between the piston rod and the reservoir of shock absorber assembly 80 can be reproduced, as can the side loads experienced by shock absorber assembly 80 in a direction perpendicular to its axis.

Alternatively, the shock absorber assembly endurance testing apparatus may be used for other simplified tests, such as controlling the piston rod and the reservoir of the shock absorber assembly 80 to perform relative harmonic motion, and controlling the shock absorber assembly 80 to bear sinusoidal wave loads or constant loads in the longitudinal and transverse directions of the vehicle. The method is also used for a two-axis endurance test of the shock absorber assembly, and comprises the steps that the piston rod of the shock absorber and the oil storage cylinder move relatively to control the shock absorber assembly to bear a lateral load.

Alternatively, the test object of the shock absorber assembly endurance test apparatus is the shock absorber assembly 80, and the types of the shock absorber assembly 80 may include different types of shock absorbers such as an air spring shock absorber, a coil spring shock absorber, a hydraulic shock absorber, and a pneumatic shock absorber. In the case of an air spring damper, an air supply system and a pneumatic pressure regulating system are required in the test apparatus.

In all embodiments of the present application, the terms "large" and "small" are relatively speaking, and the terms "upper" and "lower" are relatively speaking, so that descriptions of these relative terms are not repeated herein.

It should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present application," or "as an alternative implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in this embodiment," "in the examples of the present application," or "as an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art should also appreciate that the embodiments described in this specification are all alternative embodiments and that the acts and modules involved are not necessarily required for this application.

In various embodiments of the present application, it should be understood that the size of the serial number of each process described above does not mean that the execution sequence is necessarily sequential, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A durability test device for a shock absorber assembly is characterized by comprising an actuating assembly, a force transmission rod assembly and a shock absorber connecting block;

the actuating assembly comprises a first actuator, a second actuator and a third actuator which are mutually orthogonal, the third actuator is arranged in the vertical direction, and the first actuator and the second actuator are arranged in the horizontal direction;

the shock absorber connecting block is arranged between the first actuator and the shock absorber assembly, the axial direction of the third actuator is the same as that of the shock absorber assembly, and the shock absorber connecting block is respectively connected with the first actuator, the second actuator and the third actuator through a dowel bar assembly.

2. The durability testing apparatus for a shock absorber assembly according to claim 1, further comprising a first actuator mount, a first suspension bracket, a second actuator mount, and a second suspension bracket;

the first actuator fixing seat is connected with a first end of the first actuator through a spherical hinge, and the first suspension bracket is arranged at a second end of the first actuator and is connected with the first actuator through a spring;

the second actuator fixing base with the first end of second actuator is passed through the ball pivot and is connected, the second hang support set up in the second end of second actuator, through the spring with the second actuator is connected.

3. The shock absorber assembly endurance testing apparatus according to claim 1, further comprising a first force sensor, a first guide rod, a second force sensor, and a second guide rod, said dowel assembly including a first dowel and a second dowel;

the second end of the first actuator, the first force sensor, the first guide rod and the first force transmission rod are sequentially connected with the shock absorber connecting block, and a spherical hinge is arranged between the first guide rod and the first force transmission rod;

the second end of the second actuator, the second force sensor, the second guide rod and the second dowel bar are sequentially connected with the shock absorber connecting block, and a spherical hinge is arranged between the second guide rod and the second dowel bar.

4. The durability test apparatus for a shock absorber assembly according to claim 3, wherein the apparatus further comprises a first guide holder, a first guide gimbal bearing, a second guide holder, and a second guide gimbal bearing;

the first guide fixing seat is arranged on the side of the first guide rod, an inner ring of the first guide universal bearing is nested in the first guide rod, and the first guide universal bearing is fixed on the first guide fixing seat;

the second guide fixing seat is arranged on the side of the second guide rod, an inner ring of the second guide universal bearing is nested on the second guide rod, and the second guide universal bearing is fixed on the second guide fixing seat.

5. The durability test device for the shock absorber assembly according to claim 3, wherein the first force transmission rod and the second force transmission rod are fixedly connected with the shock absorber connecting block, the revolute pair or connected through a spherical hinge respectively.

6. The durability test device for the shock absorber assembly according to claim 1, further comprising a shock absorber assembly fixing seat, wherein a fixing clamp is arranged on the shock absorber assembly fixing seat, and the shock absorber assembly is mounted on the shock absorber assembly fixing seat through the fixing clamp.

7. The shock absorber assembly endurance testing apparatus of claim 1, further comprising a gantry, said third actuator suspended from said gantry, a first end of said third actuator connected to a top beam of said gantry by a ball joint.

8. The shock absorber assembly endurance testing apparatus according to claim 7, further comprising a third guide rod and a third force sensor, said dowel assembly comprising a third dowel;

the second end of the third actuator, the third guide rod, the third dowel bar and the third force sensor are sequentially connected with the shock absorber connecting block, and a spherical hinge is arranged between the third guide rod and the third dowel bar.

9. The endurance testing apparatus for shock absorber assemblies according to claim 8, further comprising a third guide universal bearing, an inner ring of the third guide universal bearing being nested in the third guide rod, the third guide universal bearing being fixed to the cross beam of the gantry.

10. A shock absorber assembly endurance testing method, applied to the shock absorber assembly endurance testing apparatus according to any one of claims 1 to 9, said method comprising:

receiving road spectrum acquisition data, wherein the road spectrum acquisition data comprises a first sensor acquisition signal in the operation process of the shock absorber assembly;

driving the actuating component according to the road spectrum acquisition data;

receiving a second sensor acquisition signal of the actuating assembly;

and adjusting the operating parameters of the actuating assembly so that the error between the signal collected by the second sensor and the signal collected by the first sensor is within a preset interval.

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