Abstract:
A tensioner device for a belt or chain defines a housing defining a bore with a plunger disposed in the bore. A spring is engaged with the plunger for biasing the plunger in an outward direction. The housing further includes an oil chamber connected to an oil passage in communication with the oil chamber for delivering pressurized oil to the oil chamber, wherein when the oil chamber is pressurized the pressurized oil applies a counter force opposing a force of the spring.
Abstract:
In an aspect, a tensioner is provided for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device. The tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys. The first tensioner pulley is rotatably mounted to the tensioner arm. The tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member. The second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member. The ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member.
Abstract:
The present disclosure provides an automatic belt tensioner for an engine which automatically adjusts the tension of a belt for transmitting rotational force between an engine and an auxiliary machinery component. The automatic belt tensioner includes: a tensioner body mounted at the engine side and having an internal space; a tension spring installed in the internal space of the tensioner body; first and second damping shoes coupled by the tension spring; a first arm having a hinge portion coupled to the first damping shoe; a second arm having a hinge portion coupled to the second damping shoe; and idlers rotatably mounted on the first and second arms, respectively, and also supporting the belt. The first hinge portion which is a rotation center of the first arm and the second hinge portion which is a rotation center of the second arm are rotatably coupled to the tensioner body.
Abstract:
In an aspect, a tensioner is provided for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device. The tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys. The first tensioner pulley is rotatably mounted to the tensioner arm. The tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member. The second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member. The ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member.
Abstract:
A system for maintaining tension in a drive belt comprises a first belt tensioner that comprises a first pulley mounted on a first lever arm, and a second belt tensioner that comprises a second pulley mounted on a second lever arm. The first belt tensioner is configured and positioned to bias the first pulley against the drive belt at a first location following a departure of the drive belt from a pulley coupled to a motor-generator unit and to thereby maintain tension on the drive belt during both driving and driven modes of the motor-generator unit. The second belt tensioner is configured and positioned to bias the second pulley against the drive belt at a second location prior to an approach of the drive belt toward the pulley and to thereby maintain tension on the drive belt at the second location during both driving and driven modes.
Abstract:
A tensioner for a power transmission system includes two tensioning arms operatively engaged with a strand of either the chain or the belt of the power transmission system. The upper end of each tensioning arm is connected to a one way rotational clutch which is pivotally mounted between the upper ends of the tensioning arms. The one way clutch rotates in one direction in response to changing chain loads to adjust the tension substantially equally on both strands at the same time. In order to prevent over-tensioning, a damping means is included in the one-way clutch. When a pre-determined overload threshold is reached, the amount of torque required to overcome the coefficient of friction of a spring in the damper allows the one way clutch to slip in the direction opposite from its normal rotational direction, thereby relieving the overload condition on the chain.
Abstract:
ISSUE: A chain tensioning device with a short center distance that can impart a tensioning force to a plurality of chain spans at the same time with a simple structure. MEANS OF RESOLUTION: A tensioning device (1) includes a first tensioner arm (2) having an arm part (20) disposed outside a chain span (C)1 and a flange part (21) integrated with the arm part (20) and projecting toward the internal space between chain spans (C1, C2), a second tensioner arm (3) having an arm part (30) disposed outside a chain span (C2) and a flange part (31) integrated with the arm part (30), projecting toward the internal space between chain spans (C1, C2), and overlapping the flange part (21), a linking part pivotably linking the flange parts 821, 31) at the overlapping portion of the flange parts (21, 31), and a tensioner (4) urging the first tensioner arm (2) toward the chain span (C1).
Abstract:
In the timing drive of an internal combustion engine, cyclic variations in chain tension, in the span traveling from a camshaft sprocket toward the crankshaft sprocket are leveled by synchronous reciprocating movement of a guide in sliding contact with that span of chain. The maximum rearward speed of the guide coincides approximately with the maximum tension in the span of chain, and the maximum forward speed of the guide coincides approximately with the minimum tension in the chain.
Abstract:
A tensioner for a power transmission system includes two tensioning arms operatively engaged with the strand of the chain or the belt of the power transmission system. The upper end of each tensioning arm is connected to a two way damper which is pivotally mounted between the upper ends of the tensioning arms. When a pre-determined chain tension overload threshold is reached, the amount of torque required to overcome the coefficient of friction the damper allows the tensioner to adjust the tension in the chain with minimal oscillations and minimal phase change variation.
Abstract:
A serpentine accessory-belt, aggregate, drive arrangement wherein an intake side of an engine block is placed toward the frontal side of a vehicle, and engine accessories are mounted at the right side of the engine in a forward direction of the vehicle, enabling to minimize thermal damage to a serpentine belt and facilitate accessibility and maintenance of the engine.