Claims
- 1. An engine valve drive control device for an engine having a rotatable cam shaft, the cam shaft being rotatably driven by the engine and the control device comprising:
- a cam lobe mounted on the cam shaft and selectively being rotated by the cam shaft, the cam lobe being rotated when engaged with the rotating cam shaft to thereby drive a valve of the engine, the cam lobe being slidable in an axial direction with respect to the cam shaft;
- cam rotation halting means for stopping rotation of the cam lobe to thereby deactivate the valve, the cam rotation halting means sliding the cam lobe in the axial direction to connect and disconnect the cam lobe from the cam shaft;
- a joint pin movably mounted in the cam shaft, the joint pin being extendable from and retractable into the cam shaft, the joint pin extending beyond an outer circumference of the cam shaft when extended therefrom; and
- a cam lobe slider rotatably fitted on the cam shaft, the cam lobe slider having a joint hole for receiving the joint pin, the joint pin being movable into the joint hole to thereby rotate the cam lobe slider with the cam shaft to slide the cam lobe in the axial direction.
- 2. The engine valve drive control device as set forth in claim 1, wherein a side of the cam lobe has an engagement portion and the device further comprising a connector, the connector having an engagement portion opposed to the engagement portion of the cam lobe, the connector being integrated with the cam shaft and being engageable with the cam lobe.
- 3. The engine valve drive control device as set forth in claim 2, further comprising disengagement timing adjusting means for disengaging said cam lobe from said connector by temporarily halting rotation of said cam lobe by sliding the cam lobe axially in a disengaging direction and for releasing the cam lobe to permit resumption of rotation thereof at a predetermined timing.
- 4. An engine valve drive control device for an engine having a rotatable cam shaft, the cam shaft being rotatably driven by the engine and the control device comprising:
- a cam lobe mounted on the cam shaft and selectively being rotated by the cam shaft, the cam lobe being rotated when engaged with the rotating cam shaft to thereby drive a valve of the engine, the cam lobe being slidable in an axial direction with respect to the cam shaft; and
- cam rotation halting means for stopping inertial rotation of the cam lobe to thereby deactivate the valve before the cam lobe has activated the valve, the cam rotation halting means sliding the cam lobe in the axial direction to connect and disconnect the cam lobe from the cam shaft, said cam rotation halting means including damping means for absorbing rotational kinetic energy of the cam lobe.
- 5. The engine valve drive control device as set forth in claim 4, wherein a side of the cam lobe has an engagement portion and the device further comprising a connector, the connector having an engagement portion opposed to the engagement portion of the cam lobe, the connector being integrated with the cam shaft and being engageable with the cam lobe.
- 6. The engine valve drive control device as set forth in claim 5, further comprising disengagement timing adjusting means for disengaging said cam lobe from said connector by temporarily halting rotation of said cam lobe by sliding the cam lobe axially in a disengaging direction and for releasing the cam lobe to permit resumption of rotation thereof at a predetermined timing.
- 7. An engine valve drive control device for an engine having a rotatable cam shaft, the cam shaft being rotatably driven by the engine and the control device comprising:
- a connector rigidly mounted on the cam shaft, the connector being rotatable with the cam shaft;
- a cam lobe selectively engageable by the connector;
- a joint pin movably mounted in the cam shaft, the joint pin being extendable from and retractable into the cam shaft, the joint pin extending beyond an outer circumference of the cam shaft when extended therefrom;
- a cam lobe slider rotatably fitted on the cam shaft, the cam lobe slider having a joint hole for receiving the joint pin, the joint pin being movable into the joint hole to thereby rotate the cam lobe slider with the cam shaft, the cam lobe slider sliding the cam lobe in the axial direction when the joint pin is inserted into the joint hole and the cam lobe slider rotates with the cam shaft, sliding of the cam lobe in the axial direction operatively connecting the cam lobe with the cam shaft such that the cam lobe is rotated therewith, the cam lobe being operatively connected to a valve of the engine such that rotation of the cam lobe drives the valve; and
- cam rotation halting means for sliding the cam lobe in an axial direction to disconnect the cam lobe from the cam shaft.
- 8. The engine valve drive control device as set forth in claim 7, wherein at least two cam lobes are provided on the cam shaft, the at least two cam lobes each being operatively connected to a valve of the engine and each cam lobe being axially movable on the cam shaft.
- 9. The engine valve drive control device as set forth in claim 7, wherein the joint hole has two opposed end portions having a generally semicircular shape and a central portion, the central portion being located between the two opposed end portions, a diameter of each of the end portions being generally equal to a diameter of the joint pin and the central portion having a width which is wider than the diameter of the joint pin.
- 10. The engine valve drive control device as set forth in claim 7, wherein the joint hole has two opposed end portions and a central portion therebetween, the two end portions having an arcuate shape with an arc thereof being generally equal to a diameter of the joint pin, the arcs of the end portions being smoothly merged into side edges of the central portion, the side edges of the central portion being wider than the diameter of the joint pin.
- 11. The engine valve drive control device as set forth in claim 7, wherein the cam shaft has an oil passage and a through hole defined therein, the oil passage being connected to the through hole, the joint pin being inserted into the through hole, the joint pin having a transverse hole therein, when oil pressure is applied through the oil passage, the joint pin being extended from the cam shaft to extend beyond the outer circumference of the cam shaft and when oil pressure on the joint pin terminates, the joint pin being retracted into the cam shaft.
- 12. The engine valve drive control device as set forth in claim 7, wherein said cam lobe is moved in the axial direction along a longitudinal axis of the cam shaft, and wherein:
- the connector has a circumferential end face formed with a dowel joint recess, two flat faces generally normal to the longitudinal axis of the cam shaft and a sloped face extending between the two flat faces, the dowel joint recess being located between the two flat faces and being spaced from the sloped face by the two flat faces; and
- the cam lobe having a first dowel on one circumferential end face and a second dowel on an opposed circumferential end face, the first dowel facing the connector and being received in the dowel joint recess of the connector when the cam lobe is rotating with the cam shaft.
- 13. The engine valve drive control device as set forth in claim 12, wherein the opposed circumferential end face of the cam lobe having the second dowel further has a cylindrical portion thereon, the cylindrical portion being positioned between the second dowel and a plate cam portion of the cam lobe, the sides of the plate cam portion forming the opposed circumferential end faces of the cam lobe, the cylindrical portion having a notch formed therein, the notch being offset by a predetermined angle from the second dowel, the notch merging into an outer circumference of the cylindrical portion through a sloped face, the cylindrical portion having an inner circumference formed with a second notch of a predetermined shape, the second notch having a constant thickness from the circumferential end face on which the cylindrical portion is mounted, the second notch merging from a slightly inclined arcuate short end face, through a steep end face into a deep end face and then into a gently sloped end face.
- 14. The engine valve drive control device as set forth in claim 13, wherein the cam lobe slider has two opposed circumferential end faces, the circumferential end face facing the cam lobe having a slight slope portion which merges through a steep end portion into a deep end face portion and then into a gently sloped face portion which is adjacent the slight slope portion, the opposed circumferential end face of the cam lobe slider being formed with portions symmetric to the portions on the end face facing the cam lobe but being offset by 90 degrees in a circumferential direction.
- 15. The engine valve drive control device as set forth in claim 14, wherein the joint hole is formed in a side wall of the cam lobe slider between the two opposed circumferential end faces.
- 16. The engine valve drive control device as set forth in claim 14, further comprising a second cam lobe rotatably mounted on the cam shaft, the cam lobe slider being sandwiched between the two cam lobes, both of the cam lobes being axially movable on the cam shaft.
- 17. The engine valve drive control device as set forth in claim 14, further comprising a rigid cam lobe mounted on the cam shaft, the connector being located between the rigid cam lobe and the first axially slidable cam lobe.
- 18. The engine valve drive control device as set forth in claim 14, wherein said cam rotation halting means includes damping means for absorbing rotational kinetic energy of the cam lobe.
- 19. The engine valve drive control device as set forth in claim 5, further comprising:
- a joint pin movably mounted in the cam shaft, the joint pin being extendable from and retractable into the cam shaft, the joint pin extending beyond an outer circumference of the cam shaft when extended therefrom; and
- a cam lobe slider rotatably fitted on the cam shaft, the cam lobe slider having a joint hole for receiving the joint pin, the joint pin being movable into the joint hole to thereby rotate the cam lobe slider with the cam shaft to slide the cam lobe in the axial direction.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-147102 |
Jun 1994 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/467,832 filed on Jun. 6, 1995, now abandoned.
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Continuations (1)
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Number |
Date |
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Parent |
467832 |
Jun 1995 |
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