A belt-driven linear module includes a tensioning assembly and a drive belt. The tensioning assembly includes a support shaft and a bearing. The support shaft is configured to be installed at a driven end of the linear module. The bearing includes an inner ring and an outer ring. The inner ring is positioned on the support shaft, and the outer ring is configured to be wrapped by the drive belt of the linear module so as to tension the drive belt of the linear module.

A sealed tensioner is used in an automotive application to keep a belt or chain under its intended tension as it wears and stretches. The sealed tensioner is hydraulic but lacks an outside oil supply. The sealed tensioner, in an example, includes a body with a bore. A piston is carried in the bore. A clearance resides at a confrontation between the body and the piston. A check valve is situated between a low pressure reservoir and a high pressure chamber. The sealed tensioner further includes a closed cell foam that is situated at the low pressure reservoir.

A connection rod coupling assembly includes a settable shape mounting second component having a lateral, primary axis and a bearing assembly including a bearing assembly body. The bearing assembly body includes a substantially cylindrical outer surface and a center axis. The bearing assembly body is coupled to the settable shape mounting second component in a non-aligned configuration. That is, the bearing assembly body center axis is offset from the settable shape mounting second component primary axis. Thus, the position of the bearing assembly body center axis is adjustable by repositioning the settable shape mounting second component relative to a settable shape mounting first component on a swing lever. The adjustment of the bearing assembly body, in turn, adjusts the range of the ram assembly and the ram assembly body.

An object of the present invention is to provide a tensioner that has a reduced number of components and lighter weight and is easy to assemble. The tensioner according to the present invention is configured such that a base member is detachably and mechanically joined to a rear end opening of a cylindrical plunger with a closed front end against the resilience of biasing means that is accommodated inside the plunger such as to be freely extend and contract. The joint between the plunger and the base member is a mechanical connection that is one of a thread engagement, a press-fit, and a pin connection.

A hydraulic tensioner for an internal combustion engine for tensioning a span of a chain or a belt has a piston with an internal reservoir connected to a high pressure chamber through a check valve assembly. The check valve assembly has a disk seat formed by an internal bulge within the piston; a check valve retainer within the piston, and a moveable disk that is received between the disk seat formed by the internal bulge and the check valve retainer and is moveable between a first position and a second position, and a check valve spring that is received between the check valve disk and the check valve retainer.

The present disclosure relates to a timing system of an engine, which is capable of coping with a pneumatic brake system requiring high drive torque without changing a cylinder block, a cylinder head, and a valve train. The timing system includes a gear train mechanism configured to transmit power of a crankshaft to an air compressor and a high pressure pump via gear transmission, a first chain mechanism configured to transmit the power transmitted to the high pressure pump to a camshaft via chain transmission, and a second chain mechanism configured to transmit the power of the crankshaft to an oil pump via chain transmission.

The present invention is to provide a regulation mechanism capable of dynamically adjusting balance of tension on two sides of a multi-groove transmission belt between a driving wheel and a driven wheel, which includes a pivot balance plate pivotally connected to a transmission mechanism; two smooth idlers and a multi-groove idler pivotally connected on the pivot balance plate respectively and spaced apart from each other by a first gap and a second gap respectively; and a tension regulating rod rotatably disposed between the transmission mechanism and the pivot balance plate for dynamically adjusting balance of tension on the two sides of the multi-groove transmission belt, such that the multi-groove transmission belt can pass these gaps sequentially to wind on the driving wheel and the driven wheel, thereby the outer and inner side surfaces thereof are abutted with the smooth idlers and the multi-groove idler respectively.

A hydraulic tensioner includes a tensioner housing having a bore extending a length, with a slot along the length of the bore. A hollow piston is slidably received within the bore and has an outer circumference with a chamfer adjacent a formed edge. An expandable circlip is received by the outer circumference of the piston. The circlip includes a substantially clover shaped body with a plurality of lobes connected to a first leg and a second leg through connecting portions. The expandable circlip has a free state, in which the lobes of the circlip are engaged with at least the chamfer of the piston, and an expanded state, in which the first leg and the second leg are moved away from each other, disengaged from the chamfer. When the expandable circlip is in the free state, the piston is prevented from being ejected from the bore of the housing.

To provide a simple-structured tensioner that generates less knocking noise at the start-up of the engine and that prevents an excessive chain tension, severe friction, noise or vibration during the running of the engine, while also reducing production costs. The tensioner includes a ring control mechanism that controls the position of a resilient ring. The ring control mechanism includes a front-side restricting part having a front-side restricting surface and capable of restricting forward movement of the resilient ring, and a rear-side restriction member having a rear-side restricting surface and capable of restricting rearward movement of the resilient ring. The front-side restricting part is fixed to or formed integrally with the housing. The rear-side restriction member is disposed movable in a front to back direction relative to the housing and the plunger.

An automatic tensioning apparatus is provided that includes a tensioning drive unit having: a longitudinally extending stationary base frame with a plurality of guides extending between a lower portion and an upper portion, and a plurality of rotatable feed wheels axially secured at the lower portion, as well as a translatable drive frame slidably coupled to the plurality of guides with a drive assembly coupled to the drive frame, the drive assembly including a drive motor and a tensile member interface for engaging and rotationally translating a tensile member. The tensioning drive unit further including a plurality of drive frame actuators actuatable to move the drive frame between a bottom frame position and a top frame position, as well as a sensor for at least indirectly sensing the position of the drive frame along a longitudinal base frame axis.