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1. A retractable cover for truck bed vehicles, which comprises a mechanism box (100) provided in the inner portion with a stress shaft (10) consisting of a profile (10A) provided with a cylindrical geometry with at least three protrusions (10B) arranged longitudinally in order to allow fixing of at least two rollers (12) through a groove (121) that fit together with the at least three protrusions (10B) of the stress shaft (10), and fixing of the at least two rollers (12) with the stress shaft (10) occurs through a screw (122) and at its ends the stress shaft (10) has a first tip (11) and a second tip (11A) that fit together with at least two supports (100C) of the mechanism box (100), the profile (10A) having in its inner portion a helical spring (13) threadedly attached to the second tip (11A) keeping the helical spring anchored to a side of the mechanism box and locking its rotational movement and at the other end it is threaded to a torpedo (14) responsible for rotationally securing the helical spring (13) in relation to the profile (10A) of the stress shaft (10), this assembly being provided with a cylindrical rod (15) responsible for supporting the helical spring (13) within the profile (10A) of the stress shaft (10), the cylindrical rod (15) fitting at its ends the first tip (11) and the second tip (11A) of the stress shaft (10), the torpedo (14) provided with at least two projections (141) allowing the attachment to the protrusions (10B) of the profile of the stress shaft (10), in order to allow rotational locking of the helical spring (13) but still let the spring end move linearly as it is being wound; a drive shaft (20) provided with at least two supports (21) that receive at one end of the shaft a clutch system (22) and at the opposite end a motor (23) provided with coupling shaft and connecting tube, the clutch system (22) which is provided with a relief (103) which, when threaded by the user, moves and enters the mechanism box (100) abutting and pushing the end of a fork (221) provided with a support (222) that is fitted with a gear (223) fixed to the main shaft, laterally shifting the stress shaft (10), compressing a spring (224) more and more in order to decouple the motor (23), at the end opposite the drive shaft (20) is provided with a gear (24) that directs traction of the motor (23) for movement of a mat (200), and the gear (24) is fixed to the drive shaft (20), the drive shaft (20) which is provided with the motor (23) arranged with the at least two support (21) which is provided with a shaft (231) connected and locked with a coupling shaft (25) provided with at least two protrusions (251) that fit together with a groove (241) of the gear (24), so that when the clutch system (22) is actuated the gear (24) is moved together with the drive shaft (20) in order to decouple the groove (241) from the at least two protrusions (251) of the coupling shaft (25) of the motor (23) and the manual movement of the mat (200); the mechanism box (100) is provided on its outer portion with a drain (101) with a water outlet hose (102), clutch decoupling the relief (103) and a module (104), so that these components are positioned inside the truck bed vehicle, the mechanism box (100) which is provided with a mat (200) of interconnected profiles that moves in a sliding manner along a side profile (300) fixed to the sides of the truck bed vehicle, and in an upper portion of the box mechanism (100) a finishing lid (201) is arranged through at least two screws (202) with the side profile (300) allowing access to the internal components of the mechanism box (100), the side profile (300) which is provided with a rail (301) which is fitted together with the relief (103) of the mechanism box (100) and is fixed to the mechanism box (100) through a set of screws arranged on the side portion of the box.
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