Abstract: Configuring the inside of a tooth portion 15 of a toothed belt 10 with a core rubber layer 14 and the outer periphery of the tooth portion 15 with a tooth rubber layer 12. Also, including short fibers in the core rubber layer 14. The tooth rubber layer 12 is formed by curing a rubber composition containing 10 parts by weight or less high-density polyethylene with 100 parts by weight of matrix rubber. The value of tan ? for the tooth rubber layer 12 at 100-120° C. is maintained at 0.100-0.120.

Abstract: A holding surface 7 holding a portion of a belt 4 radially outwardly of a pulley flange 6 is formed on a belt mounting jig 1. A guide surface 8 guiding the belt 4 to the holding surface 7 is formed on the belt mounting jig 1. The guide surface 8 is formed into a curved shape bulging forwardly of the direction of rotation continuously from the holding surface 7. The belt mounting jig 1 is fixed to a small-diameter-side or low-load-side pulley 2. The belt 4 is wound around the belt mounting jig 1 and pulleys 2 and 3, and the large-diameter-side or high-load-side pulley 3 is rotated. The pulley 2 is rotated by a tension of the belt 4 guided in the rotating direction by the guide surface 8. The portion of the belt 4 slides in a direction along the pulley axis into a pulley groove 5.

Abstract: Configuring the inside of a tooth portion 15 of a toothed belt 10 with a core rubber layer 14 and the outer periphery of the tooth portion 15 with a tooth rubber layer 12. Also, including short fibers in the core rubber layer 14. The tooth rubber layer 12 is formed by curing a rubber composition containing 10 parts by weight or less high-density polyethylene with 100 parts by weight of matrix rubber. The value of tan ? for the tooth rubber layer 12 at 100-120° C. is maintained at 0.100-0.120.

Abstract: An arm (3) supporting a tension pulley (2) around which an endless torque transmitting member (B) is looped is supported by a fixed member (E) via a base member (7). A torsion coil spring (8) is interposed between the base member (7) and the arm (3). The base member (7) is brought into pressure-contact with the fixed member (E) by a tightening force of a bolt (6). A pivot shaft (5) is fitted onto the outer circumference of the bolt (6) so as not to cause a tip to contact the fixed member (E). By transmitting an axial force generated by tightening the bolt (6) to the base member (7) via a flange (5A) formed on the outer circumference of the pivot shaft (5), the distribution of a contact pressure between the fixed member (E) and the base member (7) is optimized.

Abstract: An electric power steering apparatus includes a reduction gear mechanism (17) for reducing the rotation speed of an output shaft (16) of an electric motor (15). The reduction gear mechanism (17) comprises an inscribed gear (39) rotatable interlockingly with the output shaft (16), and a circumscribed gear (40) in which the inscribed gear (39) is inscribed. An endless belt connects a driving pulley (41) integrally rotatable with the circumscribed gear (40) and a driven pulley (42) disposed so as to surround a steerable shaft. By heightening the reduction gear ratio by the speed reduction using the inscribed gear (39) and the circumscribed gear (40), the reduction gear mechanism (17) as a whole can achieve a high reduction gear ratio without making the diameter of the driving pulley (41) very small.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.

Abstract: An electric power steering apparatus comprises an electric motor for producing a steering assist force, and a speed reduction mechanism for decelerating the rotation of an output shaft in the electric motor. The speed reduction mechanism comprises an input pulley driven by the electric motor, an output pulley connected to a steering shaft, and a belt for connecting the input pulley and the output pulley to each other. The belt comprises a helical toothed belt. The input pulley and the output pulley respectively include helical toothed pulleys meshed with the helical toothed belt.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other and a belt tension adjuster.

Abstract: A toothed belt transmission is provided in which a toothed belt is trained around drive and driven pulleys. Each toothed pulley has a circumferential periphery formed with a plurality of teeth. Adjacent teeth are assigned as a first tooth portion and a second tooth portion. Respective tooth portions have arcuate portions at corners defined between tooth edges and tooth surfaces. A line touching the arcuate portions of the first and second tooth portions is assigned as a common tangential line. A line passing over a starting point of the arcuate portion of the tooth edge of the first tooth is assigned as a first tangential line. An angle between the common tangential line and the first tangential line falls in a range between 6° and 14.4°.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.