Linear tensioner

本发明包括一个张紧器，具有一个滑轮(1)，以枢轴接合至一个壳体(3)。壳体还包括一个引导器(4)。引导器滑动地接合至一个基座(6)上的轨道(7，17)。引导器和轨道约束壳体，以便在一个预定的直线的路径上移动。轨道是由被滑轮限定的两个轴线水平地偏移的。滑轮载荷也是由引导器的移动的轴线偏移的。引导器和轨道具有一个预定的摩擦系数，从而使累积的结果是一个非对称的阻尼作用。再者，一个连杆(8)连接在壳体和一个凸轮体(9)之间。凸轮体是可转动地连接至基座。一个偏移元件，比如一个扭力弹簧(11)偏移凸轮体，通过连杆抵抗带载荷。凸轮体的半径是可改变的，以便当张紧器滑轮响应一个载荷改变而移动时保持一个恒定的带载荷。 A tensioner having a pulley journaled to a housing. The housing further comprises a guide. The guide slidingly engages rails on a base. The guide and rails constrain the housing to move in a predetermined linear path. The rails are horizontally offset from two axis defined by the pulley. The pulley load is also vertically offset from the axis of movement of the guide. The guide and rails have a predetermined frictional coefficient so that the cumulative result is an asymmetric damping effect. Further, a linkage is connected between the housing and a camming body. The camming body is rotatably connected to the base. A biasing member such as a torsion spring biases the camming body against the belt load through the linkage. The radius of the camming body is variable to maintain a constant belt load as the tensioner pulley moves in response to a load change.