公开(公告)号：EP1078819A3

公开(公告)日：2001-12-05

申请号：EP00111273.9

申请日：2000-05-25

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Ogawa, Atomu ,  Mizuno, Toshiyuki

IPC分类号： B60R9/05

CPC分类号： B60R9/05

摘要： A front crossbar (12) of a roof rack provided above a roof (11) along the width of a vehicle comprises an upper surface (18) and a lower surface (20). The upper surface ()18) is smoothly curved and convex toward the upper direction, and the upper surface (18) introduces an attached flow of air from the front of the vehicle to the rear of the vehicle. The lower surface (20) of the front crossbar (12) comprises a flow compression face in the front of the lower surface (20), a flow leading face in the center of the lower surface, and a flow separation portion in the rear of the lower surface. The flow compression face is hollowed toward the center point of the cross-section of the front crossbar (12), and introduces and compresses the air flow from the front of the vehicle. The flow leading face is a smooth convex arc of a circle as the cross-section, and leads the air flow compressed from the front of the front crossbar (12) to the rear of the front crossbar (12). The flow separation portion is notch shaped like a step, and separates the air flow from the front of the front crossbar (12). Since the difference of the pressure, the velocity, or etc. between the two air flows separated to the lower and upper sides of the front crossbar (12) is high, a Karman vortex which causes wind noise of the front crossbar (12) can be avoided. Consequently, the wind noise of the roof rack can be reduced efficiently.

摘要翻译： 沿车辆宽度设置在车顶（11）上方的车顶行李架的前横梁（12）包括上表面（18）和下表面（20）。 上表面（）18平滑地弯曲并且朝向上方凸出，并且上表面（18）将附着的气流从车辆的前部引入到车辆的后部。 前横杆（12）的下表面（20）包括位于下表面（20）前方的流动压缩面，位于下表面中央的流动前表面以及位于下表面中央的流动分离部分 下表面。 流动压缩面朝向前横杆（12）的横截面的中心点挖空，并且引入并压缩来自车辆前部的气流。 导流面是横截面为圆形的平滑凸弧，并且引导气流从前横杆（12）的前部压缩到前横杆（12）的后部。 流动分离部分呈阶梯状的切口形状，并将气流与前横杆（12）的前部分开。 由于分离到前横杆（12）的下侧和上侧的两个气流之间的压力，速度等的差异较大，所以引起前横杆（12）的风噪声的卡门涡流 应避免。 因此，可以有效地降低车顶行李架的风噪声。

公开(公告)号：EP1078819A2

公开(公告)日：2001-02-28

申请号：EP00111273.9

申请日：2000-05-25

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA

发明人： Ogawa, Atomu ,  Mizuno, Toshiyuki

IPC分类号： B60R9/05

CPC分类号： B60R9/05

摘要： A front crossbar (12) of a roof rack provided above a roof (11) along the width of a vehicle comprises an upper surface (18) and a lower surface (20). The upper surface ()18) is smoothly curved and convex toward the upper direction, and the upper surface (18) introduces an attached flow of air from the front of the vehicle to the rear of the vehicle. The lower surface (20) of the front crossbar (12) comprises a flow compression face in the front of the lower surface (20), a flow leading face in the center of the lower surface, and a flow separation portion in the rear of the lower surface. The flow compression face is hollowed toward the center point of the cross-section of the front crossbar (12), and introduces and compresses the air flow from the front of the vehicle. The flow leading face is a smooth convex arc of a circle as the cross-section, and leads the air flow compressed from the front of the front crossbar (12) to the rear of the front crossbar (12). The flow separation portion is notch shaped like a step, and separates the air flow from the front of the front crossbar (12). Since the difference of the pressure, the velocity, or etc. between the two air flows separated to the lower and upper sides of the front crossbar (12) is high, a Karman vortex which causes wind noise of the front crossbar (12) can be avoided. Consequently, the wind noise of the roof rack can be reduced efficiently.