Abstract: A connecting rod of an internal combustion engine, that includes a large bore, and an interior bore surface. The current art uses soft metal bearing surfaces to reduce wear, and friction between the connecting rod inner diameter and the crankshaft journal surface. The soft metal bearing surface is a separate component of the engine. In this invention the large bore end interior diameter is coated with a hard material to reduce, or eliminate wear. The hard material is a metal or metal alloy applied to the inner diameter by a thermal spray method. A relatively soft polymer material can also be applied to the interior diameter surface of the con-rod bore. The relatively softer polymer acts as a first and sometimes a consumable layer, and applied over the thermal sprayed hard layer. The polymer layer is often used in conjunction with the sprayed metal layer.

Abstract: A hydraulic cylinder assembly includes a cylinder and a piston rod. The cylinder has an opening and upper and lower inner walls formed by a bore. An end of the piston rod is received in the bore through the opening and travels reciprocally through the opening in response to volume change of a hydraulic fluid in the cylinder. The cylinder has a first section adjacent the opening provided with a narrow passage of the piston rod close to the cylinder upper inner wall. The cylinder has further a second section spaced apart from the opening and provided with a clearance between the piston rod and the lower inner wall forming a chamber for the hydraulic fluid. The inner upper wall at the first section is provided with circumferential camberings.

Abstract: A hydraulic cylinder includes a piston unit inside a cylinder to be free to slide within the cylinder; and a piston rod having the piston unit fixed to one end thereof and another end thereof projecting from the cylinder. The piston unit is inserted into a small diameter portion of the piston rod with an end surface thereof fixedly contacting a shoulder end surface of the piston rod. A round portion is formed as an annular concave in a base end portion outer periphery of the small diameter portion of the piston rod. A tapered portion is formed on an inner periphery of the piston unit from the end surface in alignment with a portion formed by concaving the small diameter portion. A length of the tapered portion in a piston unit axial direction is equal or greater than a length of the concave portion in a piston rod axial direction.

Abstract: A gyroscopic rotary engine includes a rotary disc used as a cylinder block; a cylinder head on which medium inlets and medium outlets are arranged in a spaced relation; wherein at least two arched cylinders are disposed on the rotary disc in an equally spaced-apart relation; a gyroscopic unit disposed obliquely on the rotary disc relative to an axis of the rotary disc, the gyroscopic unit comprising a rotation shaft and pistons positioned symmetrically about the rotation shaft and having the number corresponding to the number of the arched cylinders, the pistons being disposed in the respective arched cylinders and firmly secured to the rotation shaft by respective connecting rods; and the rotary disc rotatably engaged with the cylinder head.

Abstract: An improved scotch yoke engine of pump including a piston joined to a yoke structure wherein the piston (1) is free to move along at least one axis defined by a flying cross (60) relative to the yoke structure (7) during piston reciprocation, the piston and yoke structure being joined in a flat type joint arrangement and the piston prevented from rotation around the piston axis by engagement of the piston and the yoke with the flying cross, the flying cross being not locked in position between the piston base (50) and the yoke shank end arrangement (700).

Abstract: Drywall mud pump for pumping drywall joint compound, for instance, from a bucket into a drywall tool. The pump includes a cylinder, a piston, a rod, and a means, or a connection structure between the piston and the rod, for allowing the end of the rod to move laterally relative to the piston. Some embodiments have an elongated hole in the piston that receives a flattened or reduced diameter end of the rod, for example. Different embodiments include a pump head through which the rod passes, a handle, a linkage, a means for allowing the rod to pivot, a shortened guide, a means for preventing the piston from rotating about the rod, or a combination thereof. Pistons may include, for example, passageways with straight and curved sides, a flapper, an elongated washer to block the elongated hole, and a means for controlling the rotational position of the washer.

Abstract: The present invention relates to a connecting rod assembly and method of manufacturing same. The method includes defining a small end of a connecting rod having a terminal end and defining a pin bore extending through the small end. A pair of channels is forged on opposite sides of the small end, such that each of the channels is substantially perpendicular to the pin bore. A bushing having a contact surface including at least partially annular grooves and opposed distal ends is subsequently formed and installed into the pin bore of the small end. Following installation of the bushing, the connecting rod is machined to reduce the width of the small end between each channel and the terminal end to where at least a portion of the grooves are disposed along the distal ends to reduce the need to deburr the area adjacent the pin bore.

Abstract: The present invention relates to a method of manufacturing a connecting rod assembly having a stepped small end. The method includes defining a small end of a connecting rod assembly having a terminal end and defining a pin bore extending therethrough. A pair of channels are formed on opposite sides of the small end, perpendicular to the pin bore and a bushing is subsequently installed into the pin bore. Where a connecting rod assembly does not include a bushing the method includes defining a small end having a pin bore and forming pair of channels on opposite sides of the small end. A contact surface is then defined within the pin bore to engage a piston pin and the small end is machined to provide a stepped configuration. The connecting rod assembly is then machined to reduce the width of the small end to provide a stepped configuration.

Abstract: A piston head of a hydraulic injection molding machine is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine. The piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged with a first screw formed in an outer circumference of the tie rod. An insert groove having a predetermined shape is formed in the inner circumference of the piston head in front of the second screw.

Abstract: An assist device 11 is equipped with a spring means 21 (gas spring), and a piston 24 in a cylinder 23 moves upward or downward according to a relative displacement motion (flexing or stretching motion) of a thigh 4 and a crus 5 at a knee joint 8 of a leg 3 of a robot. Air chambers 25 and 26 above and below the piston 24 are filled with gases. If a flexing degree at the knee joint 8 is a predetermined value or less, then the air chambers 25 and 26 are brought into communication through a groove 28 in the cylinder 23, and the spring means 21 does not generate an elastic force, but if the flexing degree exceeds the predetermined value, then the air chambers 25 and 26 are hermetically sealed from each other and the spring means 21 produces an elastic force, the elastic force acting on the knee joint 8 as assisting driving force. A burden on a joint actuator of a leg can be reduced, while reducing energy consumption of the robot by using a small and simple construction.

Abstract: A piston compressor has a cylinder including a traveling piston sealed therein. A drive motor acts on a crankshaft, a drive shaft thereof being received by a bore of the crankshaft. A connecting rod provides for articulated connection of a crankshaft-journal of the crankshaft with the piston in a connecting rod bearing. The connecting rod is disposed relative to the drive shaft in an angled orientation that counteracts bowing deflection of the drive shaft that occurs during operation to protect against undesirable wear of the piston seal and of the connecting rod bearing.

Abstract: Apparatus is disclosed for articulating and correcting the trajectory of a piston in a volumetric machine with a plurality of pistons in a plurality of corresponding curved cylinders. The apparatus includes a piston seal ring positioned in a plane inclined to a plane of rotation of the pistons, with the inclined plane being different for each of the pistons and an intersection point of the axis of rotation of the pistons and an axis of rotation of the cylinders, a position compensation element permitting movement of the selected piston tangential to an instantaneous trajectory of that piston, and a piston support in radial contact with that piston to compensate centrifugal forces acting on that piston.

Abstract: A roller-control unit for a continuously-variable-ratio transmission of the toroidal-race rolling-traction type, in which the roller carriage (10, 14) is connected by a pivotal joint (30) to the piston (15) of a hydraulic piston-and-cylinder unit (15, 16). The piston (15) is double-acting, and the piston/cylinder contact is the only locus through which the roller carriage (10, 14) makes contact with the fixed structure of the transmission. The piston (15) may have an inner part (32) to which the roller carriage (10, 14) is jointed, and a sleeve-like outer part (33, 34) which makes the necessary sliding and sealing contacts with the cylinder (16), but allows the roller carriage (10, 14) the necessary freedom of pivoting movement during use.

Abstract: A cylinder with cross inlet and exhaust ports contains a combination piston and rod having on its piston end a piston head or face and slidably attached sealing sleeve, and its other end is rotatable via a rod bearing attached to a crankshaft. The rotational motion of the rod with the crankshaft imparts an undulating movement to the piston head during its stroke motion and, in unison with the slidably attached sealing sleeve, effects a sequence wherein the exhaust ports open ahead of the inlet and close before the inlet closes.

Abstract: A fluid operated linear motor of the piston and cylinder type. The piston is secured to a rod by a threaded connection and the mating threads are proportioned and dimensioned so that pivotal movement available in the threaded connection is enough to compensate at least in part for manufacturing tolerances and eccentricities and prevent or reduce abnormal distribution of lateral forces by the piston on the outer cylinder.

Abstract: An axial piston machine has a cylinder barrel mounted on a shaft and rotatable with respect to a portion of the casing. Between the cylinder block and the casing portion is a disc. The side of the disc adjacent the casing portion is concave and abutting casing portion is correspondingly convex. The disc is restrained against rotation and forms part of the valving means for the cylinder barrel. In one embodiment the casing and shaft are in two articulated sections. The shaft sections lie in a common plane and are pivotable with respect to each other about a point and the casing sections are pivotable about an axis normal to that plane and offset with respect to the shaft pivot point. In another embodiment the casing and shaft are each a single unit.