摘要:
An oil pump comprises a pump casing, a crankshaft, an inner rotor mounted on the crankshaft, an outer rotor, an intake chamber, and a discharge chamber. The inner rotor has outwardly projecting teeth which engage with inwardly projecting teeth of the outer rotor for rotating the outer rotor for transferring oil from the intake chamber to the discharge chamber. A stopper is provided which contacts edge portions of the teeth of the inner and outer rotors respectively to prevent oil in a space between the teeth from leaking.
摘要:
A hydraulic actuator for a skid control hydraulic brake system comprises a casing having a master cylinder side port and a cover having a wheey cylinder side port. The wheel cylinder side port is positioned generally between an inflow solenoid valve and an outflow solenoid valve. The inflow and outflow solenoid valves define on their upper clearances, respectively. A three dimensionally curved pipe is embedded, by molding, in the cover to conduct fluid from the clearances to the wheel cylinder side port.
摘要:
A flow control valve unit for controlling flow rate of a pressurized working fluid flowing from a hydraulic pump to an actuator of a power steering device includes a spool chamber, a spool valve, an inlet port, a discharge port, a drain port and a notch. The spool chamber has a first chamber portion for receiving the fluid through the inlet port, and a second chamber portion which is communicated with the discharge port. The spool valve is movable from a first position in which the drain port is fully closed to a second position in which the drain port is partially opened. The second position defines first and second gaps respectively between a first land portion of the spool valve and an edge of the drain port and between the first land portion and an edge of the notch for allowing the fluid to flow from the first chamber portion to the drain port through two passages. The notch is positioned so as to be substantially opposed to the drain port and to make an area of the second gap larger than that of the first gap by a certain degree, such that, when the first gap is substantially narrowly opened, flow rate of the fluid flowing from the first chamber portion to said drain port through the first gap is set substantially equal to or less than flow rate of the fluid flowing through the second gap.
摘要:
A rotor-type oil pump for supplying lubricating oil to an automotive internal combustion engine. The oil pump is comprised of inner and outer rotors which are rotatably disposed inside a pump casing. The inner rotor is formed with an external gear partly in mesh with an internal gear of the outer rotor. The inner rotor is fixedly mounted on a drive shaft forming part of an engine crankshaft and formed at its inner peripheral surface with at least three flat surface portions which are located at equal intervals in the peripheral direction. The at least three flat surface portions of the inner rotor are fittingly contactable respectively with at least three flat surface portions formed at the peripheral surface of the drive shaft, thereby preventing the inner rotor from shifting radially upon receiving a biasing force (due to a pressure differential) directing to an oil inlet chamber side.
摘要:
A valve timing control system includes a timing sprocket, a camshaft, a sleeve secured to the camshaft and accomodated within the timing sprocket. A helical piston assembly and a floating piston are movably disposed in an annular space between the timing sprocket and the sleeve. An end plug is disposed at one end of the timing sprocket to close one end of the annular space. First and second chambers are defined between the floating piston and the end plug and between the floating piston and the helical piston assembly, respectively. A valve spool is operatively connected to an actuator and movably disposed in the sleeve. The valve spool moves among first, second and third positions. At the first position, the first and second chambers are drained. At the second position, the first chamber is communicated with a hydraulic fluid pump and the second chamber is drained. At the third position, the first and second chambers are communicated with the hydraulic fluid pump.
摘要:
A valve timing control apparatus comprises a rotary member drivingly connected to the crankshaft for rotation with rotation of the crankshaft, and a drive mechanism for transmitting rotation of the rotary member to the camshaft. The drive mechanism includes a piston member provided for reciprocation to rotate the camshaft with respect to the rotary member. The piston member has a pressure chamber formed therein. The piston member is urged resiliently in a first direction. The piston member is movable in a second direction opposite to the first direction in response to a pressure introduced into the pressure chamber. The valve timing control apparatus also includes first and second conduit. The first conduit has a first outlet for connection to the pressure chamber. The second conduit has a second outlet for connection to the pressure chamber. The second outlet is spaced away from the first outlet in the first direction of movement of the piston member. First and second command signals are produced according to engine operating conditions. A pressure is introduced through the first conduit in the presence of the first command signal. A pressure is introduced through the second conduit in the presence of the second command signal.
摘要:
A valve mechanism for internal combustion engines of a type having a plurality of intake or exhaust valves for each cylinder is shown. A unique arrangement is applied to the valve mechanism for permitting the cam shaft to be positioned above the intake (or exhaust) valves. With the arrangement, the freedom in layout of an associated ignition spark plug in the engine is increased.
摘要:
A hydraulic shock absorber is provided which includes generally a cylinder assembly to define working and reservoir chambers therewithin, a piston rod, a rod guide member which guides bounding and rebounding strokes of the piston rod, and an oil seal contacting with the piston rod to seal an opening of the cylinder assembly. The rod guide member includes outer and inner supporting sections. The inner supporting section also includes outer and inner wall sections which are coaxially arranged with a preselected interval therebetween. The outer wall section is spaced from an inner wall of the cylinder assembly to provide flexibility to the rod guide in cooperation with the inner wall section. The shock absorber further includes a reinforcement partly inserted into the oil seal to provide flexural rigidity to the outer supporting section of the rod guide and a communication path defined by a chambered surface formed on a peripheral surface of the reinforcement and a recessed portion formed in an edge portion of the first supporting section to fluidly connect the working and reservoir chambers.
摘要:
A valve timing control device for an internal combustion engine, comprises an engine synchronous rotary member, such as a timing sprocket, timing pulley and so forth, driven by an engine output in synchronism with engine revolution, and a camshaft. The device also has first means disposed between said engine synchronous rotary member and said camshaft for causing relative angular displacement between said engine synchronous rotary member and said camshaft synchronous rotary member in a first dislacement direction for retarding valve timing and interlocking said camshaft and said engine synchronous rotary member for preventing relative angular displacement in a second displacement direction which is opposite from said first direction, for advancing valve timinmg, and second means disposed between said engine synchrous rotary member and said camshaft for causing relative angular displacement between said engine synchronous rotary member and said camshaft synchronous rotary member in said displacement direction for advancing valve timing and interlocking said camshaft and said engine synchronous rotary member for preventing relative angular displacement in said first displacement direction for retarding valve timing. Third means is provided for selectively activating one of said first and second means in response to the engine driving condition for retarding and advancing phase relationship between said engine synchronous member and said camshaft.
摘要:
An oil passage structure for a rocker-arm shaft for an internal combustion engine, comprises an outer cylindrical member for rotatably supporting rocker arms and an inner cylindrical member press-fitted into the outer cylindrical member. The inner cylindrical member employs at least one concavity having a given axial length for defining at least two axial oil passages.