Structure of joining resin molded bodies

Abstract

A reliable and superior joining strength in entire joining parts of resin molded bodies including tilting portions is obtained by devising a shape and a size of each protrusion for welding provided in the joining parts of the resin molded bodies. In a structure of joining resin molded bodies according to the present invention, upper and lower half bodies 10 and 20 are joined with each other by means of a vibration welding method while the upper and lower half bodies 10 and 20 are being pressurized in a state in which joining parts thereof are butted into each other in a substantially entire area of the joining parts. The joining parts of the respective half bodies have vertical portions 11 and 13 and vertical portions 21 and 23 respectively vertical to a pressurizing direction and tilting portions 12 and 22 tilting relative to the pressurizing direction, and protrusions for welding 11 E to 13 E or 21 E to 23 E are provided in at least the joining part of one of the half bodies. Further, referring to a butting area of the protrusions in a butted state, the butting area in the vertical portions is set to be narrower than the butting area in the tilting portions.

1 . A joining structure for joining a pair of resin molded bodies by means of a vibration welding method while applying a pressure to the pair of resin molded bodies in a state in which joining parts of the pair of resin molded bodies are butted into each other across a substantially entire area thereof, wherein: 
 the joining parts of the pair of resin molded bodies have vertical portions vertical to a direction in which the pressure is applied and tilting portions tilting relative to the pressurizing direction;    the protrusions for welding are provided in at least the joining part of one of the pair of resin molded parts; and    a butting area of the protrusions in the vertical portions is set to be narrower than a butting area thereof in the tilting portions in a state in which the protrusions are butted.    
     
     
         2 . A joining structure for joining a pair of resin molded bodies according to  claim 1 , wherein: 
 the forgoing constitution is preferably adapted to increase the butting area of the protrusions in the vertical portions toward a base of each protrusion.    
     
     
         3 . A joining structure for joining a pair of resin molded bodies according to  claim 1 , wherein: 
 the protrusions in the pressurizing direction more preferably have a substantially rectangular shape in section in the tilting portions, substantially a triangular shape in section in the vertical portions and substantially a trapezoidal shape in section between the vertical portions and the tilting portions.    
     
     
         4 . A joining structure for joining a pair of resin molded bodies according to  claim 1 , wherein: 
 referring to a sectional area of welding margins of the protrusions in a direction orthogonal to a butting surface, the sectional area in the tilting portions is more preferably set to be equal to or more than sectional area in the vertical portions.