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    • 3. 发明授权
    • Lawn mower
    • 割草机
    • US5293731A
    • 1994-03-15
    • US907096
    • 1992-07-01
    • W. Roger ThomasVincent Carr
    • W. Roger ThomasVincent Carr
    • A01D34/68F04D27/02F16D59/02H02K7/12A01D34/82
    • A01D34/6812F04D27/008F16D59/02H02K7/125A01D2101/00Y10S56/04
    • A braking system for a rotary mower includes a brake element which is secured to an impeller and is urged by a spring normally into braking engagement with a fixed brake friction member. On start-up of a motor of the mower, rotation of the impeller causes axial movement of the brake element against the spring and out of braking engagement. Movement of the brake element may be assisted by mechanical means, for example by a multiple ball and ramp system or arrangement. In this embodiment, four equally spaced balls are normally located in ramped recesses formed in an upper face of an adaptor element, such that on start-up of the motor, the balls ramp up at least partially out of the recesses, and assist in urging a braking element and a friction element out of braking engagement with one another. This assist stops when the motor is turned off, the balls now moving back into their respective lowest positions in the recesses formed in the upper face of the adaptor element.
    • 一种用于旋转割草机的制动系统包括固定到叶轮上的制动元件,并被与通常与固定制动摩擦件制动接合的弹簧推动。 在割草机的电动机起动时,叶轮的旋转导致制动元件相对于弹簧的轴向运动并且脱离制动啮合。 制动元件的移动可以通过机械装置来辅助,例如通过多球和斜坡系统或排列。 在该实施例中,四个相等间隔的球通常位于形成在适配器元件的上表面中的斜坡凹槽中,使得在马达启动时,球至少部分地从凹槽中上升,并且有助于推动 制动元件和摩擦元件彼此制动接合。 当电动机关闭时,该辅助停止,球现在在形成在适配器元件的上表面中的凹部中返回到它们各自的最低位置。