Please select the most similar patent number from A, B, C and D. Which number is?
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.
A: An airbag (10) and a folding method for the airbag (10). The airbag (10) comprises a first airbag cavity (100) and a second airbag cavity (200), the second airbag cavity (200) is arranged on a panel of the first airbag cavity (100), and when the airbag (10) is in an unfolded state, the size of the second airbag cavity (200) in a first direction (V) is smaller than the size of the first airbag cavity (100) in the first direction (V); the first airbag cavity (100) is provided with a left part (130) and a right part (140) which are arranged along a second direction (H), when the airbag (10) is in a folded state, the left part (130) and the right part (140) are folded inward to form a left covering part (1301) and a right covering part (1401), the left covering part (1301) and the right covering part (1401) each are configured to cover part of the second airbag cavity (200) to completely cover the second airbag cavity (200) from the left and right sides, the second direction (H) being different from the first direction (V). Therefore, the unfolding speed of the second airbag cavity (200) can be effectively controlled, and the second airbag cavity (200) can only be inflated and unfolded at a desired operating position, thereby improving the stability of the airbag (10) during inflation and unfolding.
B: 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.
C: A pneumatic mat device, comprising a controller and at least one undulating assembly unit. A surface of the undulating assembly unit can alternate between undulation states. The undulating assembly unit comprises at least one first air bag (1), at least one second air bag (2), a first air pump (A), and a second air pump (B). The controller controls the first air pump (A) and the second air pump (B) to operate alternately. When the first air pump (A) is operating, air is drawn from the inflated second air bag (2) to inflate the first air bag (1) to be inflated, such that the first air bag (1) and the second air bag (2) are in a first undulation state during an operation period of the first air pump (A). When the second air pump (B) is operating, air is drawn from the inflated first air bag (1) to inflate the second air bag (2) to be inflated, such that the first air bag (1) and the second air bag (2) are in a second undulation state during an operation period of the second air pump (B). Alternate operations of the first air pump (A) and the second air pump (B) enable the first air bag (1) and the second air bag (2) to undulate alternately, such that the surface of the undulating assembly alternates between the undulation states.
D: A cover handling tool and a cover assembly structure. The cover handling tool comprises: a first airbag part (10), a second airbag part (20), and an airflow passage structure (30) connecting the first airbag part (10) and the second airbag part (20). By means of the airflow passage structure, an internal space of the first airbag part (10) communicates with an internal space of the second airbag part (20). When the second airbag part (20) is squeezed, the volume of the first airbag part (10) is larger than that of an insertion space; when a squeezing force applied to the second airbag part (20) ceases, the volume of the first airbag part is less than or equal to that of the insertion space. Airbag parts having changeable volumes are provided, and the structural feature of the airbag parts enables a container to be connected to or separated from a cover without requiring a finger of a user to come into direct contact with the cover, thereby preventing substances inside the container engaging with the cover from being contaminated.
Answer: B