Exemplary pistons and methods are disclosed. A piston may include a piston body defining a piston axis, the body including radially inner and outer body mating surfaces, and an annular ring cooperating with the piston body to form a continuous upper combustion bowl surface having a radially inner portion defined by the piston body and a radially outer portion defined by the annular ring. The annular ring includes a radially inner ring mating surface and a radially outer ring mating surface, wherein at least one of the annular ring mating surfaces is joined with the corresponding piston body mating surface. The annular ring and piston body cooperate to define an annular gap therebetween configured to thermally insulate the piston body from the annular ring.

A system, in certain embodiments, includes a composite piston. The composite piston comprises a piston body made of a composite material, wherein the composite material comprises a reinforcing material distributed in a matrix material.

A system, in certain embodiments, includes a piston clamping system including a piston rod comprising a piston rod shoulder and a piston rod nut coupled to the piston rod, wherein the piston rod nut and the piston rod shoulder are configured to axially capture first and second body portions of a piston therebetween.

An assembly for a combustion engine may include a piston and a connecting rod. The piston may include a piston crown, a piston skirt, and respective portions for accommodating a piston pin through which the piston is intended to be supported on the connecting rod. The piston skirt may have a completely closed bottom part and apertures may be provided in the portion for accommodating the piston pin. The apertures may seal against the piston pin to enclose a bottom part of the piston crown as well as the piston crown portion for accommodating the piston pin. The connecting rod may have a fork shape in an end facing the piston.

A device includes an outer cylinder having a cylinder inner wall and a cylinder outer wall and at least one magnet disposed on or between the cylinder inner wall and the cylinder outer wall and a piston having a piston inner wall and a piston outer wall and at least one magnet disposed on or between the piston outer wall and the piston inner wall. In one embodiment, the piston is rotatable within the cylinder and slidably movable along an axis respective to the cylinder. The piston is also disposed within the cylinder such that the at least one magnet disposed on or between the cylinder inner wall and the cylinder outer wall is aligned with the at least one magnet disposed on or between the piston outer wall and the piston inner wall, substantially preventing the piston from rotating relative to the cylinder.

The present disclosure describes composite actuator piston rods and methods for making such rods. Composite actuator piston rods of the present disclosure may include a composite actuator rod tube having a flared end, an insert, wherein the insert has a complementary shape to the flared end, a piston head concentrically surrounding the flared end of the composite actuator rod tube, and a piston head nut configured to threadingly attach to the piston head.

A pumping mechanism is disclosed. The pumping mechanism may include a barrel formed of a barrel substrate and including a first end surface, a second end surface opposite the first end surface, and a bore between the first and second end surfaces. Each of the first and second end surfaces and the bore is coated with a metal plating. The pumping mechanism may further include a plunger formed of a plunger substrate and configured to be slidably disposed in the bore in barrel, the plunger substrate having a tribological coating.

A system, in certain embodiments, includes a composite piston. The composite piston comprises a piston body made of a composite material, wherein the composite material comprises a reinforcing material distributed in a matrix material.

A system, in certain embodiments, includes a piston clamping system including a piston rod comprising a piston rod shoulder and a piston rod nut coupled to the piston rod, wherein the piston rod nut and the piston rod shoulder are configured to axially capture first and second body portions of a piston therebetween.

The double-acting piston (1) includes a lower half-piston (13) and an upper half-piston (14), the periphery of each the half-piston (13, 14) coming into radial stop with a radial traction disc (30) which is tightly held by a clamping screw (29) between the two half-pistons (13, 14) on the one hand, in its center, between a lower central clamping surface (19) and an upper central clamping surface (20) and, on the other hand, at its periphery, between a lower peripheral clamping surface (21) and an upper peripheral clamping surface (22), the clamping by the screw (29) of the disc (30) resulting in prestressing the lower piston cap (15) and the upper piston cap (16) that the lower half-piston (13) and the upper half-piston (14) respectively have.