摘要:
A valve rotation includes: a first sheet member that extends toward a surrounding of a valve stem under a condition that a rotation action of the first sheet member is suppressed with respect to a cylinder head, and a second sheet member that faces to the first sheet member, that is capable of rotating with respect to the first sheet member and is subjected to a load for opening the valve; a force conversion structure that converts the load for opening the valve applied to the second sheet member into a rotation force.
摘要:
Die Erfindung betrifft ein Werkzeug (10) zum Anbringen von Ventilkeilen (20) an einen Ventilschaft (4). Das Werkzeug umfasst einen längsgestreckten Halter (30) mit einer Längsachse (A), einem inneren Hohlraum (36) und einer Stirnöffnung (34) sowie einen längsgestreckten Kern (40) welcher im Hohlraum (36) des Halters (30) koaxial zur Längsachse (A) angeordnet. Zwei zur Längsachse (A) symmetrische Transportkanäle (44) sind im Werkzeug vorgesehen zum Zuführen von Ventilkeilen (20) an den Ventilschaft. Die Erfindung ist dadurch gekennzeichnet dass im Endbereich (42) des Kerns (40) koaxial zur Längsachse (A) eine längsgestreckte Ausnehmung (70) zur Aufnahme eines wesentlichen oberen Abschnitts des Ventilschafts (4) vorgesehen ist, wobei die Ausnehmung (70) des Kerns (40) in die Stirnöffnung (34) mündet und eine Tiefe (T) aufweist welche größer oder zumindest gleich dem axialen Abstand (D) zwischen Stirnende und Ringnut des Ventilschafts. Hierdurch wird erreicht, dass der Kern (40), insbesondere dessen Endbereich (42), bei Aufnahme des oberen Abschnitts eines Ventilschafts (4), die mindestens eine Ringnut (16) zumindest teilweise überdeckt, so dass die Ventilkeile (20) unterhalb der mindestens einen Ringnut (16) an die Mantelfläche eines Ventilschafts (4) zugeführt werden können und ein falsches Einrasten zuverlässig vermieden werden kann.
摘要:
A large-diameter-side end surface (104a) of a cotter (104) can be supported by a cotter holder (32) from below through inserting a shaft member (102) along an inner periphery of the cotter (104) from above the cotter (104). In this state, a protrusion (104b) of the cotter (104) and an annular groove (102a) of the shaft member (102) are fitted to each other, and the cotter (104) and a retainer (103) are taper-fitted to each other. Consequently, the cotter is prevented from being unstable, and hence it is possible to assemble the retainer (103) and the cotter (104) to the shaft member (102) with good accuracy.
摘要:
A valve spring retainer (1) is fixed at the upper end of a poppet valve (7) via a pair of cotters (6) in a valve-operating mechanism of an internal combustion engine. The valve spring retainer (1) comprises a hollow inverted-frustoconical portion (2) and an outward flange at the end thereof. The outward flange comprises an inner portion, an outer portion which is slightly higher than the inner portion, and a guide portion between the inner and outer portions.
摘要:
A device (66) for retaining a valve bridge (54) is disclosed. The valve bridge is engaged with a plurality of valves (32, 34). The device has a first base member (70, 86, 98, 106). The first base member is configured to engage at least one of the plurality of valves. The device also has a first latching member (72, 88, 92, 102, 108). The first latching member extends from the first base member. The first latching member is configured to engage and retain the valve bridge in engagement with the plurality of valves.
摘要:
A spring retainer can reduce the set height and mass of a coil spring. The spring retainer has a retainer body 3 attached to a stem end 11 of a valve and a circumferential plate-like spring part 5 having an inner circumferential part 19 supported by the retainer body 3 and resiliently supporting an end 17 of the valve spring 15. A spring constant K1 of the plate-like spring part 5 is made higher than a spring constant K2 of the valve spring 15, so that the plate-like spring part 5 deflects after the valve spring 15 is compressed, to provide a two-step load characteristic and reduce the set height, compressed height, and mass of the valve spring 15. It can also reduce the height and mass of the spring retainer 1. A spring system formed by combining the spring retainer 1 and valve spring 15 with each other will be compact and lightweight.
摘要:
A coil spring reduces Hertzian stress on a first turn and bending stress on a coil end. A coil end 11 is shifted in a diametral outer or inner direction of a coil spring relative to the first turn 13, to form a vertical gap between the coil end 11 and the first turn 13 in a free state without load on the coil spring. Due to the gap, the coil spring including the coil end 11 and first turn 13 can be entirely processed by shot peening as well as the remaining portion. The first turn 13 receives a combination of torsional stress and Hertzian stress (contact stress). Since the coil end 11 that receives high Hertzian stress is shifted in a diametral outer or inner direction of the coil spring relative to the first turn 13, a contact point on the first turn 13 is shifted in the diametral outer or inner direction to reduce the torsional stress on the first turn 13. The shift and gap formed between the coil end 11 and the first turn 13 are effective to prevent excessive bending stress and breakage of the coil end 11 when the coil end 11 and first turn 13 are repeatedly engaged and disengaged in the gap.
摘要:
The invention relates to an actuating device that actuates at least one valve pair (1) of an internal combustion engine, housed inside a housing (2) comprising, for each valve (1), magnetizing means (4, 5), at least one spring (6) that acts upon the valve (1), and comprising a fixed end connected to an adjustable stop (16), and a moving end connected in a translatory manner to the valve (1), the adjustable stop (16) comprising meshing means (26) that can interact with mating meshing means (8) of a control element (10) whereby adjusting the tare of the spring (6). The invention is characterized in that the control element (10) is placed in a fixed manner inside the housing (2) next to the adjustable stops (16) of the two valves (1) of the same pair. The housing (2) comprises means for selectively guiding and positioning the control element (10) in two meshing positions respectively with the two adjustable stops (16).