Four-axis composite fatigue test device of commercial vehicle thrust rod system and loading method of four-axis composite fatigue test device

Abstract

The invention relates to the technical field of vehicle damping joint fatigue loading tests, in particular to a four-axis composite fatigue test device of a commercial vehicle thrust rod system and a loading method of the four-axis composite fatigue test device, the thrust rod system comprises a first rubber joint, a herringbone rod piece and a second rubber joint, and the fatigue test device comprises a test platform and a portal frame assembly. The test platform further comprises a vertical loading assembly, a transverse loading assembly, a longitudinal loading assembly and a deflection loading assembly which can be independently loaded, a supporting frame is arranged on the inner side of the portal frame assembly, the deflection loading assembly comprises a base, a deflection driving part, a main shaft and a supporting plate, and the vertical loading assembly comprises a vertical driving part. The transverse loading assembly comprises a counter-force seat I and a transverse driving piece, and the longitudinal loading assembly comprises a counter-force seat II and a longitudinal driving piece. According to the fatigue test device and the loading method thereof in the scheme, the coupling problem of multi-directional loads of the thrust rod system and the loading stability problem can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle damping joint fatigue loading test, and particularly provides a four-axis composite fatigue test device for a commercial vehicle thrust rod system and a loading method thereof. BACKGROUND

[0002] The thrust rod system of a commercial vehicle chassis is a key guiding and force transmission mechanism connecting a vehicle frame and an axle, and plays a decisive role in the stability, handling and load capacity of the vehicle, especially in heavy trucks, tractors and buses. The durability and reliability of the thrust rod system of the commercial vehicle chassis, which is a key force transmission and bearing equipment of the vehicle chassis, are directly related to the service life and safety of the vehicle.

[0003] How to better verify the durability of the thrust rod system of the commercial vehicle chassis during the development stage is a key link to ensure the use performance and the stability of the vehicle in operation. In the test process, in order to ensure that the test verification result is consistent with the actual use, it is usually required that the verification conditions of the test room are as close as possible to the actual use. However, due to the particularity of the thrust rod product, the stress condition is complex during actual operation. The wheel jumping caused by the starting, braking, turning and passing through the potholed road section of the vehicle will cause the thrust rod to be subjected to vertical, lateral, longitudinal and yaw loads at the same time.

[0004] It is difficult to solve the coupling problem of loads in various directions and the stability problem of loading. The current thrust rod system loading device, as shown in the prior art, installs one end of the rod on a base and connects a T-shaped plate K to the other end. Four electro-hydraulic driven actuators are connected to the T-shaped plate K. The specific design principle is as follows: the F1 actuator is used to load the lateral load; the F2 actuator is used to load the longitudinal load; the D1 and D2 actuators are used to realize vertical loading by synchronous up and down movement; and the D1 and D2 actuators are used to realize yaw loading by reverse movement. Figure 10

[0005] The thrust rod system loading device in the prior art has the following problems: 1) the D1 and D2 actuators need to be operated cooperatively to realize the vertical and yaw loading conditions, which requires a higher calculation ability of the test control system; 2) the D1 and D2 actuators need to perform large stroke actions at the same time, which requires a higher hydraulic flow of the system; and 3) a large yaw angle may cause interference between the T-shaped plate and the vertical swing rod.

[0006] Therefore, how to design a four-axis composite fatigue test device for a commercial vehicle thrust rod system and a loading method thereof, which can meet the requirements of a test system with a lower configuration and a product with a larger yaw angle, is an urgent problem to be solved at present. SUMMARY

[0007] ​The application provides a four-axis composite fatigue test device for a thrust rod system of a commercial vehicle and a loading method thereof, which can solve the problems of multi-directional load coupling and loading stability of the thrust rod system.

[0008] The application provides a four-axis composite fatigue test device for a thrust rod system of a commercial vehicle, the thrust rod system comprising a rubber joint I and a "herringbone" rod connected with the rubber joint I, the end of the rod away from the rubber joint I comprising a rubber joint II, the fatigue test device comprising a test platform and a gantry assembly on the test platform, the test platform further comprising a vertical loading assembly, a horizontal loading assembly, a longitudinal loading assembly and a yaw loading assembly capable of being independently loaded; The inner side of the gantry assembly is provided with a support frame for mounting the rubber joint I, the yaw loading assembly comprising a base provided on the test platform and a yaw driving element connected to the gantry assembly, the base being connected with a main shaft and a support plate capable of being synchronously deflected with the rotation of the main shaft, the rubber joint II being connected to the support plate, the power output end of the yaw driving element being connected with the main shaft and capable of driving the main shaft to rotate; The vertical loading assembly comprises a vertical driving element connected to the gantry assembly, the power output end of the vertical driving element being connected with the upper end of the support frame; the horizontal loading assembly comprises a counterforce base I provided on the test platform and located on the opposite side of the base, the counterforce base I being connected with a horizontal driving element, and the power output end of the horizontal driving element being connected with the side end of the support frame; the longitudinal loading assembly comprises a counterforce base II provided on the test platform and located on the side of the base, the counterforce base II being connected with a longitudinal driving element, and the power output end of the longitudinal driving element being connected with the side end of the support frame.

[0009] Further, the base comprises a bottom plate and a side plate enclosed on the upper end of the bottom plate, the side plate comprising two horizontal plates uniformly arranged along the power output direction of the horizontal driving element and two longitudinal plates connected to the two ends of the two horizontal plates; the upper end of the two longitudinal plates is provided with a bearing seat, and the two ends of the main shaft are connected to the bearing seat through bearings; the outer wall of the main shaft is provided with a fixing table, and the power output end of the yaw driving element is connected to the fixing table.

[0010] Further, the two longitudinal plates are arranged to form an elevated section by being elevated towards the direction of the counterforce base I, the elevated section and the horizontal plate close to the side of the counterforce base I together forming an accommodation area, the support plate is located in the accommodation area, and the end of the main shaft close to the side of the counterforce base I is connected with the support plate, and a yaw gap is left between the support plate and the elevated section.

[0011] Further, a sliding groove is formed on the support plate in the longitudinal direction, and two mounting plates capable of sliding in the sliding groove to adjust the longitudinal position are arranged on the support plate, a mounting table is arranged on the mounting plate, and the rubber joint II is connected to the mounting table.

[0012] Further, the support frame comprises a bottom frame and a horizontal side frame and a longitudinal side frame located on the upper end of the bottom frame; the horizontal side frame and the longitudinal side frame are each provided with a plurality of connecting holes.

[0013] Further, the gantry assembly comprises a first main support and a second main support arranged in sequence along the longitudinal direction, and the first main support is located between the counterforce seat two and the second main support; the upper ends of the first main support and the second main support are connected with an upper support, and the upper support is provided with a connecting support; the yaw driving member and the vertical driving member are both connected to the connecting support.

[0014] Further, the lateral side frame is connected with a lateral loading plate parallel to the support plate, and the longitudinal width of the lateral loading plate is greater than the longitudinal width of the lateral side frame; the power output end of the lateral driving member is provided with a lateral loading block parallel to the lateral loading plate, and at least two groups of lateral loading rods are evenly connected between the lateral loading plate and the lateral loading block, and the two groups of lateral loading rods are arranged in sequence along the lateral direction.

[0015] Further, the lateral side frame is connected with a lateral loading plate parallel to the support plate, and the longitudinal width of the lateral loading plate is greater than the longitudinal width of the lateral side frame; the power output end of the lateral driving member is provided with a lateral loading block parallel to the lateral loading plate, and at least two groups of lateral loading rods are evenly connected between the lateral loading plate and the lateral loading block, and the two groups of lateral loading rods are arranged in sequence along the lateral direction.

[0016] Further, the lateral side frame and the longitudinal side frame are connected with a vertical loading plate parallel to the bottom frame at the upper end, and the lateral width of the vertical loading plate is greater than the lateral width of the bottom frame; the power output end of the vertical driving member is connected with a vertical loading block parallel to the vertical loading plate, and at least two groups of vertical loading rods are evenly connected between the vertical loading plate and the vertical loading block, and the two groups of vertical loading rods are arranged in sequence along the lateral direction.

[0017] A loading method of a four-axis composite fatigue test device of a commercial vehicle push rod system, the loading method is performed by using the four-axis composite fatigue test device, and comprises a lateral loading step, a longitudinal loading step, a vertical loading step and a bias loading step; the lateral loading step, the longitudinal loading step, the vertical loading step and the bias loading step can be independently performed or combined to be performed together. The lateral loading step is as follows: S1: starting the lateral driving member; S2: the power output rod of the lateral driving member drives the lateral loading block, the lateral loading rod, the lateral loading plate and the support frame to apply a lateral load to the push rod system; The longitudinal loading step is as follows: S1: starting the longitudinal driving member; S2: the power output rod of the longitudinal driving member drives the longitudinal loading block, the longitudinal loading rod, the longitudinal loading plate and the support frame to apply a longitudinal load to the push rod system; The vertical loading step is as follows: S1: starting the vertical driving member; S2: the power output rod of the vertical driving member drives the vertical loading block, the vertical loading rod, the vertical loading plate and the support frame to apply vertical load to the thrust rod system; The eccentric load loading step is as follows: S1: start the eccentric driving member; S2: the power output rod of the eccentric driving member drives the main shaft to rotate, drives the support plate to swing and applies eccentric load to the thrust rod system.

[0018] Compared with the prior art, the four-axis composite fatigue test device in the application can realize four-way simultaneous loading without cooperative operation, has no high requirements on the calculation ability of the test control system and the hydraulic flow of the system, can control the eccentric angle in a suitable range and will not cause interference phenomenon, and can greatly improve the test efficiency and test effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 1 ; Figure 2 is a schematic diagram of the overall structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 2 ; Figure 3 is a partial enlarged view of position A in Figure 2 according to the embodiment of the application Figure 4 is a schematic diagram of the local structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 1 ; Figure 5 is a schematic diagram of the local structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 2 ; Figure 6 is a schematic diagram of the local structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 3 ; Figure 7 is a schematic diagram of the local structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 4 ; Figure 8 is a schematic diagram of the local structure of the four-axis composite fatigue test device according to the embodiment of the application Figure 5 ; Figure 9 is a schematic diagram of the structure of the thrust rod system according to the embodiment of the application Figure 10 is a schematic diagram of the structure of the background art.

[0020] The reference signs in the drawings include: rubber joint one 1, rubber joint two 2, "herringbone" rod 3, test platform 4, gantry assembly 5, vertical loading assembly 6, horizontal loading assembly 7, longitudinal loading assembly 8, yaw loading assembly 9, support frame 10, base 11, bottom connecting plate 12, main shaft 13, support plate 14, vertical driving part 15, horizontal driving part 16, longitudinal driving part 17, yaw driving part 18, counterforce seat one 19, counterforce seat two 20, bottom plate 21, horizontal plate 22, longitudinal plate 23, bearing seat 24, fixed table 25, extension section 26, yaw gap 27, sliding groove 28, mounting plate 29, mounting table 30, bottom frame 31, horizontal side frame 32, longitudinal side frame 33, connecting hole 34, main support one 35, main support two 36, upper support 37, connecting support 38, horizontal loading plate 39, horizontal loading block 40, horizontal loading rod 41, longitudinal loading plate 42, longitudinal loading block 43, longitudinal loading rod 44, loading through hole 45, vertical loading plate 46, vertical loading block 47, vertical loading rod 48, outer end face 49, middle accommodating groove 50, mounting area 51, clamping plate 52, mounting hole 53, upper rack body 54, lower rack body 55, support rod 56. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not constitute a limitation on the present application. Figures 1-9 DETAILED DESCRIPTION

[0022] A four-axis composite fatigue test device for a commercial vehicle thrust rod system, as shown in the drawings, the thrust rod system includes rubber joint one 1 and "herringbone" rod 3 connected to rubber joint one 1, the end of rod 3 away from rubber joint one 1 includes rubber joint two 2, that is, two rods 3 and two rubber joints two 2. Figure 9 Figure 1 Figure 2 As shown in the drawings, the fatigue test device includes test platform 4 and gantry assembly 5 located on test platform 4, test platform 4 also includes independently loadable vertical loading assembly 6, horizontal loading assembly 7, longitudinal loading assembly 8 and yaw loading assembly 9, vertical loading assembly 6 is used for vertical loading of the thrust rod system, horizontal loading assembly 7 is used for horizontal loading of the thrust rod system, longitudinal loading assembly 8 is used for longitudinal loading of the thrust rod system, and yaw loading assembly 9 is used for yaw loading of the thrust rod system, wherein the vertical, longitudinal and horizontal directions are respectively indicated by Z, Y and X in the drawings. Figure 1

[0023] As shown in the drawings, Figure 2 Figure 3 ​​​​As shown, the gantry assembly 5 includes a main support one 35 and a main support two 36 arranged in sequence along the longitudinal direction, and an upper support 37 connected to the upper ends of the main support one 35 and the main support two 36, and a connecting support 38 arranged on the upper support 37, and the upper support 37 includes an upper frame body 54 and a lower frame body 55 connected to the upper end and the lower end of the upper support 37 respectively, and a plurality of support rods 56 arranged between the upper frame body 54 and the lower frame body 55, and a support frame 10 for mounting the rubber joint one 1 is arranged on the inner side of the gantry assembly 5, and the support frame 10 includes a bottom frame 31 and a transverse side frame 32 and a longitudinal side frame 33 arranged on the upper end of the bottom frame 31, and the transverse side frame 32 and the longitudinal side frame 33 are each provided with a plurality of connecting holes 34.

[0024] The yaw loading assembly 9 includes a base 11 arranged on the test platform 4 and a yaw driving member 18 connected to the gantry assembly 5, and the base 11 is connected with a main shaft 13 and a support plate 14 capable of rotating synchronously with the main shaft 13, and the rubber joint two 2 is connected to the support plate 14, and the power output end of the yaw driving member 18 is connected with the main shaft 13 and capable of driving the main shaft 13 to rotate, and the base 11 includes a bottom plate 21 and a side plate 22 surrounding the upper end of the bottom plate 21, and the side plate 22 includes two transverse plates 22 arranged uniformly along the power output direction of the transverse driving member 16 and two longitudinal plates 23 connected to the two ends of the two transverse plates 22, and the upper ends of the two longitudinal plates 23 are provided with bearing seats 24, and the two ends of the main shaft 13 are connected to the bearing seats 24 through bearings.

[0025] The outer wall of the main shaft 13 is provided with a fixed table 25, and the power output end of the yaw driving member 18 is connected to the fixed table 25, and the support plate 14 is provided with a sliding groove 28 and two mounting plates 29 capable of sliding in the sliding groove 28 to adjust the longitudinal position, and the mounting plates 29 are provided with mounting tables 30, and the rubber joint two 2 is connected to the mounting tables 30, and the mounting table 30 includes an outer end face 49 arranged obliquely and a middle accommodating groove 50 arranged from the outer end face 49 towards the mounting plate 29, and the rubber joint two 2 is accommodated in the middle accommodating groove 50.

[0026] As shown in Figure 2 , Figure 8 , the main shaft 13 is provided with a planar mounting area 51, and the fixed table 25 is connected to the mounting area 51, and the fixed table 25 includes a bottom connecting plate 12 and two clamping plates 52 uniformly connected to the bottom connecting plate 12, and the power output end of the yaw driving member 18 is connected between the two clamping plates 52, and the bottom connecting plate 12 is connected to the mounting area 51, and the mounting area 51 is uniformly provided with a plurality of mounting holes 53, and the bottom connecting plate 12 can be connected to the mounting holes 53 at different positions to adjust the connection position.

[0027] The transverse loading assembly 7 comprises a counterforce base 19 arranged on the test platform 4 and located opposite the base 11, a transverse driving member 16 connected to the counterforce base 19, a power output end of the transverse driving member 16 connected to a side end of the support frame 10, a transverse loading plate 39 parallel to the support plate 14 connected to the transverse side frame 32, the transverse loading plate 39 having a longitudinal width greater than that of the transverse side frame 32, a transverse loading block 40 parallel to the transverse loading plate 39 arranged at the power output end of the transverse driving member 16, and at least two groups of transverse loading rods 41 evenly connected between the transverse loading plate 39 and the transverse loading block 40 and arranged in sequence along the transverse direction.

[0028] The longitudinal loading assembly 8 comprises a counterforce base 20 arranged on the test platform 4 and located beside the base 11, a longitudinal driving member 17 connected to the counterforce base 20, a power output end of the longitudinal driving member 17 connected to a side end of the support frame 10, a longitudinal loading plate 42 perpendicular to the support plate 14 connected to the longitudinal side frame 33, the longitudinal loading plate 42 having a height greater than that of the longitudinal side frame 33, a loading through hole 45 arranged in the main support 35, a power output rod of the longitudinal driving member 17 passing through the loading through hole 45 and connected to a longitudinal loading block 43 parallel to the longitudinal loading plate 42, and at least two groups of longitudinal loading rods 44 evenly connected between the longitudinal loading plate 42 and the longitudinal loading block 43 and arranged in sequence along the vertical direction.

[0029] The yaw driving member 18 and the vertical driving member 15 are both connected to the lower frame body 55, the main support 35 is provided with the loading through hole 45, the power output rod of the longitudinal driving member 17 passes through the loading through hole 45, the main support 35 is located between the counterforce base 20 and the main support 36, and the yaw driving member 18 and the vertical driving member 15 are both connected to the connecting support 38.

[0030] The vertical loading assembly 6 comprises a vertical driving member 15 connected to the gantry assembly 5, a power output end of the vertical driving member 15 connected to an upper end of the support frame 10, a vertical loading plate 46 parallel to the bottom frame 31 connected to upper ends of the transverse side frame 32 and the longitudinal side frame 33, the vertical loading plate 46 having a transverse width greater than that of the bottom frame 31, a vertical loading block 47 parallel to the vertical loading plate 46 connected to the power output end of the vertical driving member 15, and at least two groups of vertical loading rods 48 evenly connected between the vertical loading plate 46 and the vertical loading block 47 and arranged in sequence along the transverse direction.

[0031] The two longitudinal plates 23 are both arranged in an extended manner towards the counterforce base 19 to form an extended section 26, the extended section 26 and the transverse plate 22 close to the counterforce base 19 form a containing area, the support plate 14 is located in the containing area, an end of the main shaft 13 close to the counterforce base 19 is connected to the support plate 14, and a yaw gap 27 is left between the support plate 14 and the extended section 26.

[0032] A loading method of a four-axis composite fatigue test device of a commercial vehicle thrust rod system, using the four-axis composite fatigue test device for loading, comprising a transverse loading step, a longitudinal loading step, a vertical loading step and an eccentric loading step, the transverse loading step, the longitudinal loading step, the vertical loading step and the eccentric loading step can be independently performed or combined to perform together.

[0033] The transverse loading step is as follows: S1: start the transverse drive 16; S2: the power output rod of the transverse drive 16 drives the transverse loading block 40, the transverse loading rod 41, the transverse loading plate 39 and the support frame 10 to apply a transverse load to the thrust rod system.

[0034] The longitudinal loading step is as follows: S1: start the longitudinal drive 17; S2: the power output rod of the longitudinal drive 17 drives the longitudinal loading block 43, the longitudinal loading rod 44, the longitudinal loading plate 42 and the support frame 10 to apply a longitudinal load to the thrust rod system.

[0035] The vertical loading step is as follows: S1: start the vertical drive 15; S2: the power output rod of the vertical drive 15 drives the vertical loading block 47, the vertical loading rod 48, the vertical loading plate 46 and the support frame 10 to apply a vertical load to the thrust rod system.

[0036] The eccentric loading step is as follows: S1: start the eccentric drive 18; S2: the power output rod of the eccentric drive 18 drives the main shaft 13 to rotate, drives the support plate 14 to swing and applies an eccentric load to the thrust rod system.

[0037] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

[0038] The specific embodiments of the present application described above do not constitute a limitation on the scope of protection of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the scope of protection of the claims of the present application.

Claims

1. A four-axis combined fatigue test device for a commercial vehicle thrust rod system, the thrust rod system comprising a rubber joint one (1) and a "herringbone" rod member connected to the rubber joint one (1), the rod member comprising a rubber joint two (2) at an end thereof distal from the rubber joint one (1), characterized in that, The fatigue testing device comprises a testing platform (4) and a portal frame assembly (5) on the testing platform (4), and the testing platform (4) further comprises a vertical loading assembly (6), a lateral loading assembly (7), a longitudinal loading assembly (8) and a yaw loading assembly (9) which can be independently loaded; The portal frame assembly (5) is internally provided with a support frame (10) for mounting the rubber joint I (1), the yaw loading assembly (9) comprises a base (11) arranged on the testing platform (4) and a yaw driving element (18) connected to the portal frame assembly (5), the base (11) is connected with a main shaft (13) and a support plate (14) which can be synchronously deflected with the rotation of the main shaft (13), the rubber joint II (2) is connected to the support plate (14), and a power output end of the yaw driving element (18) is connected with the main shaft (13) and can drive the main shaft (13) to rotate; The vertical loading assembly (6) comprises a vertical driving element (15) connected to the portal frame assembly (5), and a power output end of the vertical driving element (15) is connected with an upper end of the support frame (10); the lateral loading assembly (7) comprises a counterforce base I (19) arranged on the testing platform (4) and located on the opposite side of the base (11), the counterforce base I (19) is connected with a lateral driving element (16), and a power output end of the lateral driving element (16) is connected with a side end of the support frame (10); the longitudinal loading assembly (8) comprises a counterforce base II (20) arranged on the testing platform (4) and located on the side of the base (11), the counterforce base II (20) is connected with a longitudinal driving element (17), and a power output end of the longitudinal driving element (17) is connected with a side end of the support frame (10).

2. The four axle composite fatigue test device for a commercial vehicle thrust rod system of claim 1, wherein, The base (11) comprises a bottom plate (21) and a side plate surrounding an upper end of the bottom plate (21), the side plate comprises two lateral plates (22) arranged uniformly along the power output direction of the lateral driving element (16) and two longitudinal plates (23) connected to two ends of the two lateral plates (22); upper ends of the two longitudinal plates (23) are provided with bearing seats (24), and both ends of the main shaft (13) are connected to the bearing seats (24) through bearings; an outer wall of the main shaft (13) is provided with a fixing table (25), and a power output end of the yaw driving element (18) is connected to the fixing table (25).

3. The four axle composite fatigue test apparatus for a commercial vehicle thrust rod system of claim 2, wherein, Both of the two longitudinal plates (23) are arranged to form an extension section (26) which is extended upwards towards the direction of the counterforce base I (19), the extension section (26) and the lateral plate (22) on the side close to the counterforce base I (19) jointly form an accommodation area, the support plate (14) is located in the accommodation area, and an end of the main shaft (13) close to the counterforce base I (19) is connected with the support plate (14), and a yaw gap (27) is left between the support plate (14) and the extension section (26).

4. The four axle composite fatigue test apparatus for a commercial vehicle thrust rod system of claim 3, wherein, The support plate (14) is provided with a sliding groove (28) and two mounting plates (29) which can slide in the sliding groove (28) to adjust the longitudinal position, the mounting plates (29) are provided with mounting tables (30), and the rubber joint II (2) is connected to the mounting tables (30).

5. The four axle composite fatigue test apparatus for a commercial vehicle thrust rod system of claim 4, wherein, The support frame (10) comprises a bottom frame (31), a transverse side frame (32) and a longitudinal side frame (33) located at the upper end of the bottom frame (31); the transverse side frame (32) and the longitudinal side frame (33) are each provided with a plurality of connecting holes (34).

6. The four axle composite fatigue test device for a commercial vehicle thrust rod system of claim 5, wherein, The portal frame assembly (5) comprises a main support one (35) and a main support two (36) arranged in sequence along the longitudinal direction, and the main support one (35) is located between the counterforce seat two (20) and the main support two (36); the upper ends of the main support one (35) and the main support two (36) are connected with an upper support (37), and the upper support (37) is provided with a connecting support (38); the yaw driving member (18) and the vertical driving member (15) are both connected to the connecting support (38).

7. The four axle composite fatigue test device for a commercial vehicle thrust rod system of claim 6, wherein, The transverse side frame (32) is connected with a transverse loading plate (39) parallel to the support plate (14), the longitudinal width of the transverse loading plate (39) is greater than the longitudinal width of the transverse side frame (32); the power output end of the transverse driving member (16) is provided with a transverse loading block (40) parallel to the transverse loading plate (39); at least two groups of transverse loading rods (41) are uniformly connected between the transverse loading plate (39) and the transverse loading block (40), and the two groups of transverse loading rods (41) are arranged in sequence along the transverse direction.

8. The four axle composite fatigue test device for a commercial vehicle thrust rod system of claim 7, wherein, The longitudinal side frame (33) is connected with a longitudinal loading plate (42) perpendicular to the support plate (14), the height of the longitudinal loading plate (42) is greater than the height of the longitudinal side frame (33); the main support one (35) is provided with a loading through hole (45), the power output rod of the longitudinal driving member (17) passes through the loading through hole (45) and is connected with a longitudinal loading block (43) parallel to the longitudinal loading plate (42); at least two groups of longitudinal loading rods (44) are uniformly connected between the longitudinal loading plate (42) and the longitudinal loading block (43), and the two groups of longitudinal loading rods (44) are arranged in sequence along the vertical direction.

9. The four axle composite fatigue test device for a commercial vehicle thrust rod system of claim 8, wherein, The upper ends of the transverse side frame (32) and the longitudinal side frame (33) are connected with a vertical loading plate (46) parallel to the bottom frame (31), the transverse width of the vertical loading plate (46) is greater than the transverse width of the bottom frame (31); the power output end of the vertical driving member (15) is connected with a vertical loading block (47) parallel to the vertical loading plate (46); at least two groups of vertical loading rods (48) are uniformly connected between the vertical loading plate (46) and the vertical loading block (47), and the two groups of vertical loading rods (48) are arranged in sequence along the transverse direction.

10. A loading method of a four-axis composite fatigue test device of a commercial vehicle thrust rod system, the four-axis composite fatigue test device of claim 9 is used for loading, characterized in that, The method comprises a transverse loading step, a longitudinal loading step, a vertical loading step and a bias loading step, and the transverse loading step, the longitudinal loading step, the vertical loading step and the bias loading step can be independently performed or combinedly performed. The transverse loading step is as follows: S1: starting the transverse driving member (16); S2: the power output rod of the transverse driving member (16) drives the transverse loading block (40), the transverse loading rod (41), the transverse loading plate (39) and the support frame (10) to apply a transverse load to the thrust rod system; The longitudinal loading step is as follows: S1: starting the longitudinal driving member (17); S2: the power output rod of the longitudinal driving member (17) drives the longitudinal loading block (43), the longitudinal loading rod (44), the longitudinal loading plate (42), and the support frame (10) to apply longitudinal load to the thrust rod system; The vertical loading steps are as follows: S1: start the vertical driving member (15); S2: the power output rod of the vertical driving member (15) drives the vertical loading block (47), the vertical loading rod (48), the vertical loading plate (46), and the support frame (10) to apply vertical load to the thrust rod system; The eccentric load loading steps are as follows: S1: start the eccentric driving member (18); S2: the power output rod of the eccentric driving member (18) drives the main shaft (13) to rotate, drives the support plate (14) to swing, and applies eccentric load to the thrust rod system.

Images