Abstract: A crossbow includes a frame, where the frame is provided with an arrow track for placing an arrow; the crossbow includes at least one limb; the limb includes a fixed end and a movable end; the movable end is moved toward the fixed end under pressure, such that two sections bent in opposite directions are formed on the limb to make the limb wave-shaped; the movable end is moved in a reverse direction to make the limb restored; and a primary string of the crossbow is directly or indirectly connected to the movable end of the limb. The limb of the crossbow can generate large elastic potential energy and can reduce the kinetic energy consumed by translation, and avoids the problem of different strokes between multiple limbs. The crossbow prevents the winding wheels from translating to consume the kinetic energy, such that the arrow can gain sufficient kinetic energy.

Abstract: A bow assembly includes a bow body assembly that pulls a string to shoot an arrow by a force generated by a rebound of an elastic body, where the bow body assembly is pivotally connected to a winding assembly for winding the string; and the winding assembly slides from a first position of the bow body assembly to a second position of the bow body assembly through a sliding assembly. The bow assembly involves manual winding, but the manual winding process will not exert any force on a limb, and a winding wheel can be moved by driving the sliding assembly by pedaling. In a shooting phase, the winding assembly is fixed relative to a bow body. In addition, the energy efficiency enhancer enables the winding wheel to continue to rotate after a limited number of revolutions. Further, as the winding wheel will not stop abruptly, noise is reduced.