A suction tube unit connected between a cylinder block and a carburetor in a stratified scavenging engine has a suction tube for mixture made of an elastic material; and a suction tube for stratified scavenging air made of an elastic material. The suction tube for mixture and the suction tube for air have, at respective inlet ends connected to the carburetor, respective wall portions which face each other and have complementary shapes. A clearance space is provided between the wall portions of the suction tube for mixture and the suction tube for air.

A utility vehicle including a body, a frame, an on-board device supplied with outside air, a chamber body having an intake space and divided into a first member disposed on a first side and opened to a second side and a second member detachably attached to the first member from the second side and opened to the first side, one of the first and second members having an engaging claw, and another one having an engaging portion, and a connecting pipe connecting the chamber body and the on-board device. The first member includes a first frame-shaped outer wall, a first tip surface, and a tip protrusion protruding from the first tip surface to the second side, and the second member includes a second frame-shaped outer wall, a second tip surface, and a tip recess recessed from the second tip surface toward the second side and fittable to the tip protrusion.

Disclosed is an intake apparatus for an engine transversely mounted within an engine compartment at a front of a vehicle. The intake apparatus comprises: an intake manifold made of a synthetic resin and disposed on a front side of the engine, the engine front side being a front side of the vehicle; and a fuel distribution pipe disposed between the engine and the intake manifold to extend in the cylinder row direction and capable of delivering fuel to respective cylinders of the engine; wherein the intake manifold has a protruding portion provided on a front surface thereof to protrude from the front surface in a vehicle forward direction, wherein the protruding portion is provided at a position capable of allowing a member disposed in front of the intake manifold to come into collision therewith in the event of a vehicle frontal collision.

An intake module of a fresh air system for an internal combustion engine may include a housing having openings through which fresh air is flowable, and a control device for controlling a cross-section of the openings. The control device may include at least one control staff rotationally mounted about an axis rotation on the housing by at least one bearing bracket, and at least one control valve rotationally fixed on the control shaft for at least one of the openings. The housing may have at least one bearing receiving portion having an insertion opening through which the bearing bracket may be inserted in an insertion direction oriented perpendicularly to the axis of rotation. The bearing bracket may have a first bearing part having a first bearing section on which the control shaft rests with a circumferential section, and a second bearing part having a second bearing section opposite the first bearing section on which the control shaft rests with a second circumferential section opposite the first circumferential section. The bearing parts may each have an inner surface facing one another in a transverse direction perpendicular to the axis of rotation and insertion direction, and at least one flat positioning surface extending perpendicularly to the transverse direction and raised from the inner surface. The positioning surfaces of the first and second bearing parts may rest flat against each other, and a gap may be formed in the transverse direction between the inner surfaces outside the positioning surfaces.

An engine includes a cylinder head having a first face defining an entrance to an intake port, and an intake manifold having a second face defining an outlet from a runner. The first and second faces mate to fluidly connect the entrance and the outlet, and an area mismatch or offset exists between the entrance and the outlet. A tongue is positioned into the intake port to extend over a floor of the intake port and has an area substantially equal to a difference between the entrance area and the outlet area. The tongue maintains in-charge motion and mixing of intake gases in-cylinder in the engine.

A mixture formation apparatus, especially for an internal combustion engine of a working device, has a mixture formation apparatus housing, where a surface of the mixture formation apparatus housing is provided at least partly with a layer structure for protection from corrosion and/or deposits. The layer structure has at least one aluminium oxide layer having a layer thickness of at least 10 m. A method of manufacturing the mixture formation apparatus, and a working device or an internal combustion engine having the mixture formation apparatus, are disclosed.

A method of mixing two fluids uses three open-ended tubular sections assembled to define a mixing valve. An axial relationship between two of the tubular sections is defined by the third tubular section. A first fluid is introduced into an annular channel defined by the tubular sections. A flow of a second fluid is introduced along a flow path through the tubular sections. The first fluid is drawn into the flow of the second fluid via holes linking the annular channel to the flow path.

A mixture formation apparatus, especially for an internal combustion engine of a working device, has a mixture formation apparatus housing, where a surface of the mixture formation apparatus housing is provided at least partly with a layer structure for protection from corrosion and/or deposits. The layer structure has at least one aluminium oxide layer having a layer thickness of at least 10 m. A method of manufacturing the mixture formation apparatus, and a working device or an internal combustion engine having the mixture formation apparatus, are disclosed.