Abstract:
An automated tensioning system is provided for a conveyor with an endless traction element that travels around an adjustably mounted pulley or sprocket. The tensioning system includes a spring housing with a lead screw/drive shaft assembly located therein that has a pushing face that extends out of one housing end. A spring compression plate is threadingly engaged with the lead screw. A plate indicator is located on the spring compression plate. A tensioner spring is located between the tensioner spring support provided by a first housing end and the spring compression plate. A sensor is located on the spring housing that is configured to detect a position of the plate indicator. A driven wheel, rotationally engaged with the drive shaft and axially slideable thereon, is driven by a motor that is controlled by a controller configured to receive position data from the position sensor/drive shaft assembly and to actuate the motor to drive the driven wheel and rotate the lead screw and advance or retract the face so that a desired tension is maintained.
Abstract:
An anti-backlash device for preventing backlash derived from a moving load on a screw used in converting rotary motion into linear motion, the anti-backlash device comprising: a cylindrical pressure actuator integrally formed with a helical thread and axially mounted on the screw; a cradle integrally formed with a helical thread and internal cradle threads, the cradle being mounted exterior to and in mechanical contact with both the cylindrical pressure actuator and the screw, and a preloading means comprising a wave spring and a retainer mounted in the cradle, wherein the screw is threaded so as to mesh with a face of the helical pressure actuator thread the helical pressure actuator is loaded on the screw by the preloading means, pressure being exerted on an upper portion of the screw thread in a first axial direction, while the helical cradle thread is simultaneously loaded on a lower portion of the same screw thread in a second, opposing axial direction, thereby applying a predetermined, axial, balanced force on the screw so as to prevent backlash.
Abstract:
본 발명은 특장차의 적재함 내부에 설치되는 개폐장치에 의해 윙바디트럭의 윙을 개폐하는 특장차 윙 개폐 방법에 관한 것으로서, 더욱 상세하게는 상기 특장차 개폐장치는 적재함의 내부에 설치되는 구동모터와, 상기 구동모터에 의해 회전되는 스크류와, 중공체로서 상기 스크류의 끝단부가 일단으로 삽입되며, 타단은 윙의 내측면에 힌지 결합되는 중공축으로 이루어지되, 상기 스크류에 대응되는 중공축의 입구부분 내주연에는 나사산이 형성되어 있어, 상기 스크류가 제자리서 회전됨에 따라 중공축은 스크류의 길이방향을 따라 전·후진하게 됨으로써 특장차의 윙을 개폐하는 것이 특징인 특장차의 윙 개폐 방법에 관한 것이다. 따라서, 본 발명은 구조가 간단하여 제조가격이 비교적 낮으며, 구동장치로서 모터를 사용하기 때문에 기존의 유압실린더에 비해 하중이 적기 때문에 보다 더 무거운 하중의 화물을 실을 수 있으며, 또한 차량에서 차지하는 설치공간이 작기 때문에 차량에 더 많은 화물을 실을 수 있다는 등의 현저한 효과가 있다.
Abstract:
This invention relates to a hoist device comprising a linear actuator, said linear actuator (6) comprising an electric motor drive (5), an outer tube (7) and an inner tube (8) that is axially movable in an out of the outer tube (7), said hoist device (1, 13, 12) comprising a lifting arm (1) and a frame structure (12, 13), wherein said lifting arm (1) is pivotally attached to said frame structure (12, 13) and said linear actuator (6) is pivotally attached at one end to said frame structure (12, 13) and at a second end to said lifting arm (1), wherein further a manual lowering device (9) arranged to enable lowering of said lifting arm (1) without use of said motor drive (5), said lowering device (9) being connected between the outer end of the inner tube (8) and an attachment device (10) of said lifting arm (1), said manual lowering device (9) comprising a stationary part (22), a rotatable part (23), a coupling (24) and a manually an operated transmission device (20, 21), wherein said stationary part (22) includes a first threaded member (201D, 319B), preferably in the form of a stub shaft, and said rotatable part (23) is connected to a threaded, clamp activating second threaded member (215, 315), preferably in the form of a nut device, interacting with said first threaded member (201D, 319B), wherein the axial position of said clamp activating second threaded member (215, 315) is arranged to control said coupling (24) to be in engaged or disengaged state and wherein said manually operated transmission device (20, 21) is arranged to control the axial position of said clamp activating second threaded member (215, 315).
Abstract:
The invention relates to an improved plunger assembly for a vehicle brake system. The plunger assembly is operable as a pressure source to control brake fluid pressure supplied to one or more wheel brakes. The plunger assembly comprises a housing defining a cylinder; a reversible motor supported by the housing and having a rotor; and a linear actuator such as a ball screw/nut mechanism driven by the motor. A plunger head is mounted in the cylinder and driven by the linear actuator in first and second opposite directions. Improvements include an elastomeric tubular torque coupler connected to a ball screw/nut anti-rotation member; and a clamped connection at an inner race of a motor bearing for securing the rotor to the ball screw/nut component.
Abstract:
The invention relates to an improved plunger assembly for a vehicle brake system. The plunger assembly is operable as a pressure source to control brake fluid pressure supplied to one or more wheel brakes. The plunger assembly comprises a housing defining a cylinder; a reversible motor supported by the housing and having a rotor; and a linear actuator such as a ball screw/nut mechanism driven by the motor. A plunger head is mounted in the cylinder and driven by the linear actuator in first and second opposite directions. Improvements include an elastomeric tubular torque coupler connected to a ball screw/nut anti-rotation member; and a clamped connection at an inner race of a motor bearing for securing the rotor to the ball screw/nut component.