知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

93 records (took 0.013 seconds)

    Variable Pitch Fan Control System
    1.
    发明申请
    Variable Pitch Fan Control System 有权

    公开(公告)号：US20210372316A1

    公开(公告)日：2021-12-02

    申请号：US17301948

    申请日：2021-04-20

    Applicant: DEERE & COMPANY

    Inventor： MANOJ T. MUTTEPAWAR ,  NISHANT KHARCHE ,  DARREN J. CRUCHELOW ,  JASON E. HAUBENSTRICKER ,  SCOTT N. CLARK

    IPC: F01P5/04 ,  F04D27/00 ,  B60K11/06 ,  F01P7/06

    Abstract: A fan control system for a variable pitch fan of a work vehicle includes a first sensor that measures a parameter of a cooling system and a blade pitch module that adjust a pitch of a plurality of blades of the variable pitch fan to generate airflow in a first direction. A reversing module selectively commands a fan reversal that includes instructing the blade pitch module to temporarily adjust the pitch of the plurality of blades to generate airflow in a second direction. A first timer module, in response to the reversing module commanding the fan reversal, resets and increments a first timer and compares the first timer to a first threshold. A first reversal prevention module, in response to the first timer being less than the first threshold, prevents the reversing module from commanding a fan reversal by indicating that a first type of fan reversal is not permitted.

    Variable pitch fan
    3.
    发明授权
    Variable pitch fan 失效
    变桨距风扇

    公开(公告)号：US6113351A

    公开(公告)日：2000-09-05

    申请号：US116518

    申请日：1998-07-16

    Applicant: Jonathan E. McCallum ,  Brian J. Bruchal ,  Murray C. Gerwing

    Inventor： Jonathan E. McCallum ,  Brian J. Bruchal ,  Murray C. Gerwing

    IPC: F01P7/06 ,  F04D27/02 ,  F04D29/06 ,  F04D29/18 ,  F04D29/36 ,  B63H3/00

    CPC classification number: F04D29/063 ,  F04D27/002 ,  F04D29/362

    Abstract: A variable pitch fan in which the pitch of the fan blades is varied under control of a controller according to the speed of the fan. The controller is programmed to respond to increased fan speed by decreasing pitch of the fan blades. The variable pitch fan has a piston extending axially from a main shaft, about which main shaft a fan blade hub rotates. A pitch shifter is mounted on a cylinder, which itself is mounted on the piston. The pitch shifter is actuated by hydraulic fluid supplied through the main shaft to the cylinder. The piston is preferably axially stationary in relation to the main shaft. The cylinder is secured against rotational movement by at least one guide pin passing into the main shaft. Grease for the pitch shifter is supplied through the guide pin. One guide pin may be used for grease supply, while another may be used for excess grease return. Cooling of a pitch shifter may be accomplished using a heat sink mounted within the fan hub, preferably in a fan configuration, to conduct heat away from the cylinder into air rotating within the fan hub. Counterweights are mounted on each fan blade of a variable pitch fan, preferably hydraulically actuated, in a position which generates a torque opposite in direction to torque generated by the fan blades. The counterweights may be overbalanced, underbalanced, or balanced.

    Abstract translation: 一种变桨距风扇，其中风扇叶片的间距根据风扇的速度在控制器的控制下变化。 控制器被编程为通过减小风扇叶片的间距来响应增加的风扇速度。 可变节距风扇具有从主轴轴向延伸的活塞，主轴与风扇叶片毂旋转。 音调移位器安装在气缸上，气缸本身安装在活塞上。 俯仰移位器由通过主轴供应到气缸的液压流体致动。 活塞优选地相对于主轴轴向静止。 气缸通过至少一个引导杆固定而抵抗旋转运动，引导销进入主轴。 齿轮换档器的润滑脂通过导销提供。 一个引导销可用于润滑脂供应，另一个可用于多余的润滑脂返回。 俯仰移位器的冷却可以使用安装在风扇轮毂内的散热器，优选地以风扇结构来实现，以将热量从气缸传导到在风扇毂内旋转的空气。 配重被安装在可变节距风扇的每个风扇叶片上，优选地液压致动，该位置产生与风扇叶片产生的转矩方向相反的扭矩。 配重可能是过度平衡，欠平衡或平衡。

Patent Agency Ranking