Abstract:
The safety coupling (10) comprises: a first coupling part (12) and a second coupling part (14) which are arranged coaxially with each other so as to rotate about a same axis of rotation (x) and are provided with respective front teeth (20, 62); and torque- sensitive releasing means (44, 64, 70, 72) designed to uncouple the first coupling part and second coupling part, thus interrupting the transmission of the torque, when the torque transmitted between the two coupling parts exceeds a given maximum torque value. The torque-sensitive releasing means include: a plunger (44) which is permanently connected for rotation with the second coupling part and is slidable along the axis of rotation between a normal working position, in which it ensures that the two coupling parts are coupled for rotation with each other, and a safety position, in which it uncouples the two coupling parts; a pressure chamber (64) filled with incompressible fluid such as to apply on the plunger a force tending to keep the plunger in the normal working position; and valve means (70, 72) adapted to allow the fluid to be discharged from the pressure chamber, and hence the plunger to be moved from the normal working position to the safety position when the pressure of the fluid in the pressure chamber exceeds a given maximum pressure value, the maximum torque value being linked to the maximum pressure value. The front teeth are first front teeth (20) provided on the first coupling part and second front teeth (62) provided on the plunger, which teeth directly mesh with each other when the plunger (44) is in the normal working position.
Abstract:
Device (200) for releasing fluid pressure from the pressure chamber of an overload clutch (A) is disclosed including a valve (210) captured in a radial cavity (202) in the cylinder (10) of the overload clutch (A) between a shoulder (204) and a valve cover (212) held by a snap ring (226). The valve cover (212) includes an aperture (228) for receiving a ball (230) and allowing the ball (230) to move radially inwardly to push against the spool member (220) of the valve (210) to unseat its head (221) from a seat (218) but preventing the ball (230) from moving out of the valve cover (212). The ball (230) rolls on a valve actuator (232) mounted to the piston (22). When the cylinder (10) and piston (22) are axially separated by fluid pressure, the ball (230) is located in a detent (234) formed in the valve actuator (232) such that the head (221) of the spool member (220) seals with the seat (218) and prevents release of fluid pressure from the pressure chamber. When the cylinder (10) and the piston (22) move axially against the normal bias direction of the fluid pressure, the ball (230) rolls out of the detent (234) and pushes against the spool member (220) to unseat the head (221) from the valve seat (218). In the most preferred form, the valve actuator (232) is adjustably mounted to the piston (22) by a turnbuckle (238), with the valve actuator (232) and the turnbuckle (238) formed of hexagonal stock for receipt in a wrench.
Abstract:
A mechanical joint with torque limiter comprises a containment body (2) inside which a first rotary part (3) and a second rotary part (4) are housed, made to rotate as a unit by locking cylinders (5) pushed with a predetermined elastic load by pressing means (7) into an operative engagement position. Advantageously, said pressing means comprise hydraulic actuation means in which a hydraulic circuit contains a hydraulic working liquid (8) that acts on said locking cylinders (5) so as to thrust them towards said operative engagement position, as well as a gas spring (7) to put the hydraulic liquid under pressure.
Abstract:
A clutch arrangement for rapid disengagement of two elements in a transmission system when a chosen torque is exceeded. The one element is a conical shaft-end which carries a corresponding sleeve (1). The sleeve carries externally at its ends two mutually separated ball bearings (5) and a force transmission ring (20) disposed therebetween. An annular force transmission body (7) surrounds and is carried by the ball bearings and includes a pressurisable hydraulic chamber which when pressurised through the medium of a valve on said body causes a reduction in the diameter of the inner surface of the body (7) so that said body will be brought into force transmitting engagement with the outer surface of the ring. The sleeve (1) carries a dogging element (14) which is adapted to act on an element (10) carried by the body (7) for depressurising the hydraulic chamber (8) upon relative rotation between the body (7) and the sleeve (1). The arrangement is such that the ring (20) and the body (7) will pass free from each other in the pressureless state of the hydraulic chamber (8). The ring (20) is operatively connected to the sleeve, so that relative rotation between the clutch components will take place between the ring and the body when the clutch is triggered.
Abstract:
The invention is directed on a torque limiting coupling (7) for a driveline (1) comprising a fluid chamber (27) within a twin walled sleeve (23) to provide a fictional engagement to a shaft (11). A shear-off tube (37) is in fluid connection to the fluid chamber (27) and is assigned to a shear-off gate (45). The shear off gate is fixedly connected to the shaft to open the fluid chamber (27) by shearing the shear-off tube (37) with the shear off gate (45). At least a first shear-off tube (37) and second shear- off tube (37) are arranged for closure of the fluid chamber (27) and for interaction with shear-off gate (45). The shear-off gate (45) provides at least one cut-off edge (51, 53), wherein at a position of blockage (38) of one of the shear-off tubes (37) by one cut-off edge (51, 53), the other shear-off tube (37) is positioned at an unblocked position.
Abstract:
A vehicle has an engine having a crankshaft, a hydraulically controlled multi- plate clutch operatively connected to the crankshaft, and an output shaft operatively connected to the clutch. The clutch selectively transmits power from the crankshaft to the output shaft. A propulsion element is operatively connected to the output shaft. A hydraulic fluid supply system is fluidly connected to the clutch for supplying pressurized hydraulic fluid to the clutch. A controller is connected to the hydraulic fluid supply system. The controller receives a torque signal indicative of engine torque and controls the hydraulic fluid supply system based at least in part on the torque signal. A clutch control method and system are also disclosed.
Abstract:
Clutch (100) for a rotary shaft (10), said clutch comprising an annular pressure chamber (110) with a sleeve surface (131) engaging a surface (11) to drivingly connected the shaft to the clutch, further comprising a trigger device (140) and a channel system (150) activatable by said trigger device upon a relative angular movement between the shaft and the chamber to release the shaft from the housing. The trigger device comprises a cam wheel (141) having a constant first radius (Rl) across a first angular interval (All) and a second, smaller, radius (R2) across a second angular interval (AI2), the cam wheel being supported on an envelope surface (12) within the first angular interval and rotating in relation to the envelope surface when the shaft rotates in relation to the housing. When a contact point reaches the second angular interval, the cam wheel is displaced to activate said channel system.
Abstract:
A device for filling and pressurisation of fluid in an enclosed space (2) at a predetermined pressure, comprising a pump connection seat (3) arranged in fluid communication with the enclosed space and adapted to receive a nozzle of a fluid pump therein; a unidirectional check valve (4) arranged between the pump connection seat and the enclosed space and configured to allow flow of fluid from the pump connection seat to the enclosed space; and a pressure-limiting valve (5) arranged in fluid communication with the pump connection seat and configured to open at the predetermined pressure, whereby the check valve immediately closes to enclose the fluid in the enclosed space at the predetermined pressure.
Abstract:
A clutch of hydraulic-pressure type comprising a linearly controlled piston (300) that is movable in a channel in the clutch and that carries a pivotally mounted support leg (208) that is spring biased into axial alignment with the piston, the side of which facing away from the support leg is loaded by the hydraulic pressure. The clutch is annular and co-operates with a shaft shank (1), and the free end of the support leg rests against a support surface carried by the shaft shank (1) upon rotation between the shaft shank (1) and the clutch (4), the support leg is turned away, whereby the piston (300) is displaced and opens a valve through which the hydraulic pressure is evacuated.
Abstract:
A hydraulic coupling (10) for use in motor vehicle driveline applications to limit speed differentiation and transfer drive torque between two rotary members. The hydraulic coupling includes a multi-plate clutch assembly (22) operably connecting the two relatively rotatable members, and a sealed actuator assembly (20) for actuating the clutch assembly (22) in response to the magnitude of speed differentiation between the two rotary members. The actuator assembly (20) includes a hydraulic pump (24) and a piston (70) which are sealed relative to the clutch assembly (22). The sealed actuator assembly (20) includes an internal recirculation path for supplying hydraulic fluid retained therein between a low pressure supply chamber (130) at the inlet side of the hydraulic pump (24) and a high pressure piston chamber (72) provided at the discharge side of the hydraulic pump (24). Hydraulic pressure in the piston chamber (72) controls the magnitude of the clutch engagement force exerted by the piston (70) on the clutch assembly (22). As a further feature, the recirculation path includes a flow restrictor (146) which provides a bleed flow path for supplying high pressure fluid from the piston chamber (72) to the supply chamber (130) following cessation of the pumping action to release the clutch assembly (22).