Abstract:
A damper is shown for damping the movements of a valve spring in an engine. The valve spring can be housed within the damper or the damper may be located inside of the valve spring. The damper is made from a suitable polymer and has one or more slots located radially to a central axis and one or more rings or bands. The slots can be parallel to the central axis or cut at an angle or curve in the wall of the damper. The rings or bands are located on the outer surface of the damper where the valve spring is located within the damper. The purpose of the slots cut into the polymer damper is to enable the polymer to deflect and conform to the shape of the spring under a radial force provided by a separate circular spring element such as a band, ring, garter spring and others. The rings or bands are located on the inner surface of the damper where the valve spring surrounds the damper. The cross section, number and location of the slots, rings or bands can be adjusted depending on the particular application of the damper and the amount of damping that is desired for the particular application.
Abstract:
A valve control system (15) in which there is provided a deactivating rocker arm (51 ) disposed beneath a conventional, upper rocker arm (27), and disposed within a module housing (17). The deactivating rocker arm includes a latch tab (63) and when the latch tab engages (FIG. 3) a latch member (65), the system operates in a normal, valve activating mode. When the latch member is in an unlatched condition (FIG. 4), the deactivating rocker arm pivots, compressing the valve return spring (41), which thereafter serves as the required lost motion spring, biasing the deactivating rocker arm (51 ) and lash compensation device (35) back toward their normal position.
Abstract:
The invention relates to a system for supplying fluid to a hydraulic bump stop (4), which is intended to take up the clearance between the valve (3) of an internal combustion engine and the actuating member (2) thereof, between which the bump stop is disposed. The bump stop (4) comprises one part (41) having an annular groove (410) and a base (411) and another part (42) which is designed to move in relation to the first part (41). The inventive system comprises: a first cup (7) which is mounted coaxially to the valve stem (32) such as to rest against the face of the cylinder head (1) from which the valve guide (31) extends, the valve stem sliding inside said guide; a second cup (5) which is also mounted coaxially around the valve stem and which is solidly connected thereto; and a helical compression spring (8) which is mounted between the two cups (5, 7) such that each of the ends (81, 82) thereof is fixed to one of said cups (5, 7). According to the invention, the part (41) of the hydraulic bump stop (4) comprising the annular groove (410) is housed inside the second cup (5) such that the base (411) of the part (41) comprising the annular groove is in permanent contact with the end of the valve stem (32), the active coils (80) of the compression spring (8) being hollow. In addition, the end (82) of the compression spring which is fixed to the first cup (7) passes through an opening (12) in the cylinder head (1), which, in turn, opens into a channel (11) in the cylinder head, while the other end (81) of the spring (8) which is fixed in the second cup (5) passes through a channel (53) provided in the latter.
Abstract:
The present invention is for the kind of power machines, engines or compressors which have two or more pistons which work against each other, preferably with a common combustion or compression chamber in a stationary cylinder and where the power is transmitted to a rotating movement without an intermediate crankshaft. It is an object of the present invention to obtain such power machine having a simple valve control means. One such device has two parallel plane discs, one stationary disc (8) and one relatively thereto rotating disc (13). The stationary disc (8) is mounted to a housing (9) and the disc (8) in turn has one in its centre positioned cylinder (1) with two end walls (2, 3). In the cylinder there are two pistons (4, 5) which are working pistons of a combustion engine and have a common combustion chamber. At the centre of the cylinder bore adjacent to the upper dead centres, UDC, of the pistons and at opposite sides thereof there are two valves (50, 51). The valve shafts at the ends which are turned only from the cylinder contact a controlling curve or surface (56) which is a part of the rotating disc. On the control curve there are raised parts (57, 58) at which the valves are opened when disc rotates.
Abstract:
A valve control device and related method of valve control which enhances performance characteristics of an internal combustion engine that utilizes push rods and extends the useful life of the valve control device is provided. The valve control device includes a valve engagement assembly (70) which, in response to movement of the camshaft (60) associated with the engine, interacts with a first valve closure mechanism (68) associated with the valve such that the valve is efficiently opened and closed. The valve engagement assembly includes a rocker arm (72), which is pivotally connected to the engine and associated with a push rod (74) which is reciprocable in response to movement of the camshaft. Further, a second valve closure mechanism (71) is associated with the push rod for actuating downward movement of the push rod in cooperation, and substantially in unison, with the first valve closure mechanism which is engageable with the rocker arm. Each valve closure mechanism can be a compression spring of predetermined stiffness or elasticity and relative strength. The push rod can be connected to the rocker arm through a ball and socket joint that allows the push rod to rotate and spin during the upward and downward movement of the push rod.
Abstract:
Power is delivered to an intake and exhaust valve through a connecting rod connected to a crank axis when the crank axis whose center is fixated rotates and then the intake and exhaust valve can open and close according to an engine cycle. This can reduce power loss due to spring compression and operate an intake and exhaust system. A slight compressive force is applied to a spring inside the valve in order to seal the gap between the valve and a cylinder wall when the intake and exhaust valve closes. [Reference numerals] (1) Spring for sealing valve gap;(2) Gap when the valve is closed;(3,BB) Crank axis for an intake and exhaust valve;(4) Connecting rod for power transmission;(5) Intake and exhaust valve;(AA,EE) Exhaust passage;(CC,FF) Cylinder block;(DD) Vertically reciprocating movement of the valve according to the rotation of the crank axis for the intake and exhaust valve
Abstract:
PURPOSE: A scissors gear for a vehicle is provided to effectively remove a backlash, thereby remarkably reducing noise generated by the backlash. CONSTITUTION: A scissors gear for a vehicle is installed in a drive gear or a driven gear of a double overhead camshaft. A plurality of spring installation grooves(120) is formed lengthily and radially around a shaft hole on one side of a first drive gear(100), thereby forming a scissors spring(300) in a coil shape. A second drive gear(200) is fitted into a boss of the first drive gear. The noise of a backlash caused by the operation of an engine or the noise from changes in the torque of a cam is reduced.
Abstract:
PURPOSE: A valve open-close mechanism by using an electromagnetic actuator is provided to lighten the weight of the valve-open-close mechanism by forming a stem from a lighter material than conventional. CONSTITUTION: A pair of electromagnets(6,7) formed of a stator(5) and a coil(18) is apposed to each other with a gas(10) therebetween. An armature(3) is disposed in the gap to be reciprocal between one electromagnet and the other electromagnet by the electromagnets. A first stem(15) for transmitting the movement of the armature from one electromagnet toward the other electromagnet to a valve(9) of an internal combustion engine is inserted in a guide hole(22) formed in the stator of one electromagnet. The first stem is formed of a lighter material than the armature to lighten the weight of the electromagnetic actuator and the valve-open-close mechanism of the internal combustion engine.