Please select the most similar patent number from A, B, C and D. Which number is?
A suspension structure of a tram, comprising: a frame (100); a front axle structure (200); a rear axle structure (300); a front suspension assembly (400), comprising two supports (410) which are symmetrically distributed on the left and right, the front axle structure (200) being simultaneously connected to the two supports (410), front thrust rod structures (420) being connected between the supports (410) and the frame, the front thrust rod structures (420) being also connected between the front axle structure (200) and the frame, and front airbag assemblies (430) being mounted on the supports (410); and a rear suspension assembly (500), comprising a pair of beam structures (510) which are symmetrically distributed on the left and right. The rear axle structure (300) is connected to the middle parts of the two beam structures (510) respectively; the middle part of each beam structure (510) is also connected to the frame by means of a rear thrust rod structure (520); rear airbag assemblies (530) are mounted at the two end parts of the beam structures (510) respectively; both the rear airbag assemblies (530) and the front airbag assemblies (30) are arranged as air spring structures; a rear vibration absorber structure (540) is connected to the side part of each rear airbag assembly (530); the rear vibration absorber structures (540) are connected to the frame; and a rear stabilizer bar structure (550) is also connected between the two beam structures (510). The suspension structure of the tram has the advantages of good vibration absorbing effect and good stability.
A: Provided is a rear subframe assembly, comprising a main body of the rear subframe and positioning supports, wherein the main body of the rear subframe is in a bilateral symmetry structure. The main body of the rear subframe is provided with a car body connection part at its upper part and a battery pack protection board connection part at its lower part; it is further provided respectively with a stabilizer bar installation part, an upper control arm installation part and a lower control arm installation part, the positioning supports are respectively arranged at the left and right ends of the main body of the rear subframe, and each positioning support is configured with a positioning part that fits with an external positioning part.
B: A suspension system testing apparatus comprises a base frame (1), a vehicle frame (5), an excitation device (4), and multiple sets of suspension cylinders (6). The excitation device (4) and the suspension cylinders (6) are all mounted on the base frame (1). The suspension system testing apparatus further comprises a stabilization support assembly (7) mounted on the base frame (1) and universally connected to the vehicle frame (5) via a first universal connector (721). The stabilization support assembly (7) further comprises an anti-twist stabilization rod (8) mounted on the vehicle frame (5) via a second universal connector (81). The anti-twist stabilization rod (8) is pivot-connected to the vehicle frame (1) and is a telescopic rod. A universal connection is provided at the join between a guide stabilization rod (72) of the stabilization support assembly (7) and the vehicle frame (5), and the guide stabilization rod (72) can move up and down along a guide sleeve/insertion hole of a stabilization support (71), thereby ensuring that the vehicle frame (5) moves up and down but does not move back and forth or left and right. In addition, the vehicle frame (5) can roll and pitch around a spherical hinge between the guide stabilization rod (72) and the vehicle frame (5).
C: A hinge-type light self-unloading farm transport vehicle comprises a front beam (1), a back beam (2), a hinge connection assembly (3), a front axle (4), a clutch (5), a front suspension frame (6), a back suspension frame (7), steel panel and spring components (8), a generator (9), and a gearbox (10). The front beam (1) is located in front of the back beam (2), and is connected to the back beam (2) via the hinge connection assembly (3). The clutch (5) is located in a flywheel housing between the generator (9) and the gearbox (10). The front suspension frame (6) is installed on the front beam (1), and the back suspension frame (7) is installed on the back beam (2). The steel panel and spring components (8) are installed on both the front suspension frame (6) and the back suspension frame (7). The hinge connection assembly (3) comprises a hinge turning plate (31), a swallow tail plate (32), an inner rectangular board (33), a pressing cover (34), a turning pin shaft (35), a left-turn hydraulic cylinder (36), a right-turn hydraulic cylinder (37), a shaft cover (38), and a center positioning shaft (39). One end of the swallow tail plate (32) is installed at a tail portion of the front beam (1), and the other end thereof is installed on the hinge turning plate (31). A terminal portion of the turning pin shaft (35) is installed with the pressing cover (34). The inner rectangular board (33) is vertically installed at an inner side of an end of the front beam (1). Each of the left-turn hydraulic cylinder (36) and the right-turn hydraulic cylinder (37) has one end installed at the hinge turning plate (31), and the other end installed on the inner rectangular board (33) via the turning pin shaft (35). The shaft cover (38) is installed at a central position of the hinge turning plate (31). One end of the center positioning shaft (39) is installed in the shaft cover (38), and the other end thereof is connected to the back beam (2). The hinge-type light self-unloading farm transport vehicle adopts a front-bridge dual-tire structure to ensure stability, has a reliable hinge assembly, and stable and reliable clutch and spring and steel plate on a suspension frame.
D: Disclosed is an independent suspension system, comprising: a supporting arm (100); an upper cross arm (200) for pulling an upper portion of the supporting arm (100); a lower cross arm (300) for pulling a lower portion of the supporting arm (100); and an airbag damping support (400), the middle portion of which is arranged on the supporting arm (100), wherein the airbag damping support (400) is provided with a first airbag and a first damper on one side of the supporting arm (100), and the airbag damping support (400) is provided with a second airbag (500) and a second damper (700) on the other side of the supporting arm (100). By means of providing the airbag damping support (400), the first airbag and the second airbag (500) can be located on two sides of the supporting arm (100) so as to expand the safety distance from the first airbag and the second airbag (500) to wheels, such that the vertical motion of the vehicle can be prevented from interfering with the first airbag and the second airbag (500), and the sizes of the first airbag and the second airbag (500) are no longer limited, and the arrangement of the first airbag and the second airbag (500) enables the independent suspension system to bear a larger load. A vehicle using the suspension system is further provided.
Answer: D