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公开(公告)号：US10598055B2
公开(公告)日：2020-03-24
申请号：US16023469
申请日：2018-06-29
Applicant: HONDA MOTOR CO., LTD.
Inventor： Dai Kataoka , Yoshihiro Takada
Abstract: An engine variable valve operating apparatus includes a cam switching mechanism having a switching drive shaft. When the switching drive shaft is longitudinally moved, a cam mechanism advances and retracts a switching pin. When the switching pin is advanced to engage in a lead groove formed around a cam carrier and the cam carrier is axially moved while rotating, cam lobes around the cam carrier are switched to act on an engine valve. An actuator for the switching drive shaft includes an actuator drive body which is linearly reciprocally movable and is coupled to a longitudinal end of the switching drive shaft to axially move the same. The above arrangement enables the cam switching mechanism and the actuator mechanism to be simple and compact in structure for preventing the engine from becoming large in size.
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公开(公告)号：US10378396B2
公开(公告)日：2019-08-13
申请号：US15861282
申请日：2018-01-03
Applicant: HONDA MOTOR CO., LTD.
Inventor： Noriaki Okano , Yoshihiro Takada
Abstract: A variable valve-operating device for an internal combustion engine has a cam carrier with cam lobes formed therearound to act on an engine valve and with a speed increasing side lead groove and a speed decreasing side lead groove formed therearound to be engaged with a speed increasing side switching pin and a speed decreasing side switching pin, respectively, to axially shift the cam carrier, to selectively make one of the cam lobes to be operative. A speed increasing side entry lead groove portion of the speed increasing side lead groove is formed in a position axially overlapping a low speed steady position lead groove portion of the speed decreasing side lead groove. A speed decreasing side entry lead groove portion of the speed decreasing side entry lead groove is formed in a position axially overlapping a high speed steady position lead groove portion of the speed increasing side lead groove. The variable valve-operating device can thus be miniaturized by reducing the axial width of the cam carrier.
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公开(公告)号：US10677112B2
公开(公告)日：2020-06-09
申请号：US16023501
申请日：2018-06-29
Applicant: HONDA MOTOR CO., LTD.
Inventor： Dai Kataoka , Yoshihiro Takada
Abstract: An internal combustion engine is provided with a variable valve operating apparatus, for use on a saddle-type vehicle. When a switching drive shaft is longitudinally moved under hydraulic pressure switched by a solenoid valve, a cam mechanism advances and retracts a switching pin. When the switching pin is advanced to engage in a lead groove in a cam carrier, the cam carrier is axially moved while rotating, to switch cam lobes to act on an engine valve. A solenoid valve is disposed on a left or right end in the leftward and rightward directions across the vehicle width, of a front or rear surface of a cylinder head. The solenoid valve is placed in an appropriate location in the cylinder head out of interference with other parts of the engine, thereby making the vehicle small in size.
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公开(公告)号：US11008908B2
公开(公告)日：2021-05-18
申请号：US16364435
申请日：2019-03-26
Applicant: HONDA MOTOR CO., LTD.
Inventor： Dai Kataoka , Hiroatsu Inui , Yoshihiro Takada , Takahiro Iwama , Masaki Cho
Abstract: An oil passageway structure for internal combustion engines includes a cylinder head having an inter-bearing wall fluid communication oil passage for providing fluid communication between a plurality of bearing walls to allow oil to flow therebetween. The cylinder head further includes a bearing wall oil passage branched from the inter-bearing wall fluid communication oil passage to supply oil to a bearing surfaces of at least one of the bearing walls. The inter-bearing wall fluid communication oil passage is defined in one of facing side walls. The bearing wall oil passageway is defined in at least one of the bearing walls. The oil passageway structure is thus made up of a reduced number of parts, can be assembled with a reduced number of man-hours, can lead to productivity growth, and is inexpensive to manufacture.
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公开(公告)号：US10677114B2
公开(公告)日：2020-06-09
申请号：US16484261
申请日：2018-02-07
Applicant: HONDA MOTOR CO., LTD.
Inventor： Yoshihiro Takada , Dai Kataoka
Abstract: A variable valve operating device for an internal combustion engine includes a cam carrier supported on a camshaft and shifting switching pins that are advanced into and retracted out of shift lead grooves defined in the cam carrier. The shift lead grooves include shift groove side walls having shift groove side wall surfaces from shift starting inflection regions of the cam carrier to shift ending inflection regions thereof. The shift groove side walls include particular shift groove side walls extending from axial positions of the shift starting inflection regions toward shift intermediate regions and also extending from circumferential positions of the shift intermediate regions disposed between the shift starting inflection regions and the shift ending inflection regions toward the shift starting inflection regions. The side walls have slanted outer circumferential surfaces extending from the circumferential positions progressively deeper toward groove bottom surfaces and reaching the shift starting inflection regions.
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Patent Agency Ranking
公开(公告)号：US10473004B2
公开(公告)日：2019-11-12
申请号：US16089882
申请日：2017-03-30
Applicant: HONDA MOTOR CO., LTD.
Inventor： Yoshihiro Takada , Dai Kataoka
Abstract: A variable valve train of an internal combustion engine has cylindrical cam carriers axially slidably and co-rotatably fitted on camshafts, respectively. The cam carriers have, respectively, first cam lobes and second cam lobes different in cam profile and axially adjacent to each other. Cam changeover mechanisms operate to axially shift the cam carriers to change over the first cam lobes and the second cam lobes to operate engine valves. An axial recess is formed in an axial end surface of an enlarged-diameter portion of the camshaft for axial insertion of an end of the cam carrier. The engine can thus be reduced in axial size, and a required axial shifting space for the cam carrier is secured.
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公开(公告)号：US10858970B2
公开(公告)日：2020-12-08
申请号：US16089958
申请日：2017-03-30
Applicant: HONDA MOTOR CO., LTD.
Inventor： Dai Kataoka , Yoshihiro Takada
Abstract: An engine camshaft has a lubricating oil passage formed along the longitudinal axis of the same, a cam communicating oil hole is radially formed from the lubricating oil passage to an outer peripheral surface of the camshaft at the same axial position as an engine valve. Cam lubrication holes are radially formed from the inside to cam surfaces of cam lobes formed around a cam carrier fitted around the camshaft. One of the cam lubrication holes of the cam lobes shifted to a position for operating the valve communicates with the cam communicating oil hole of the camshaft to supply lubricant oil.
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公开(公告)号：US10480357B2
公开(公告)日：2019-11-19
申请号：US16089900
申请日：2017-03-30
Applicant: HONDA MOTOR CO., LTD.
Inventor： Yoshihiro Takada , Dai Kataoka , Kazunori Kikuchi
Abstract: A variable valve train is provided with cylindrical cam carriers axially slidably and co-rotatably supported on camshafts. The cam carriers have thereon, respectively, plural cam lobes different in cam profile and axially adjacent to each other. Cam changeover mechanisms are provided for axially shifting the cam carriers and for changing over the cam lobes for operating on engine valves. At least one of the cam changeover mechanisms is disposed between axes of the two camshafts and on the side of an engine crankshaft relative to the axes.
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公开(公告)号：US10138769B2
公开(公告)日：2018-11-27
申请号：US15473992
申请日：2017-03-30
Applicant: HONDA MOTOR CO., LTD.
Inventor： Yoshihiro Takada , Dai Kataoka
Abstract: An engine variable valve train includes a cam changeover mechanism for axially shifting a cylindrical cam carrier fitted on and around a camshaft for changing over cam lobes on the cam carrier to cause one of the cam lobes to selectively act on an engine valve for engine operation. The cam changeover mechanism includes changeover pins adapted to be advanced and retracted for engagement with or disengagement from a lead groove formed around the cam carrier, and with a changeover driving shaft constituting a linear motion cam mechanism for causing the changeover pins to selectively advance to engage with the lead groove. The cam carrier, while rotating with the cam shaft, is axially shifted by the action of the lead groove having the changeover pins selectively engaged therewith, so that the cam lobes are changed over and one of the cam lobe is made to act on the engine valve.
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公开(公告)号：US10858969B2
公开(公告)日：2020-12-08
申请号：US16089845
申请日：2017-03-30
Applicant: HONDA MOTOR CO., LTD.
Inventor： Yoshihiro Takada , Dai Kataoka
Abstract: An engine variable valve train is provided with a cylindrical cam carrier fitted on a camshaft in a manner axially slidable to and co-rotatable with the camshaft. The cam carrier has therearound mutually adjoining low-speed and high-speed cam lobes selectively acting on the engine valve and being different in cam profile. The cam carrier has therearound lead grooves to be engaged with or disengaged from changeover pins for axial shift of the cam carrier. The lead grooves include a speed-increasing lead groove for changeover from the low-speed to the high-speed cam lobe and a speed-decreasing lead grooves for changeover from the high-speed to the low-speed cam lobe. The speed-increasing and speed-decreasing lead grooves are different in groove contour. This enables the cam carrier to axially shift smoothly and to improve the durability of the lead grooves.
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