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公开(公告)号：JPH05340215A
公开(公告)日：1993-12-21
申请号：JP15186092
申请日：1992-06-11
Applicant: MAZDA MOTOR
Inventor： HIROSE ICHIRO , IWATA KAZUO , ASAI AKIRA
IPC: F01L1/34
Abstract: PURPOSE:To carry out the proper valve timing control by installing a plurality of annular pistons which generate the conversion action of the revolution phase between an outer cylindrical member connected with an engine and an inner cylindrical member connected with a camshaft, in concentric form. CONSTITUTION:Between an outer cylindrical member 4 and an inner cylindrical member 3, a plurality of annular pistons 11 and 12 are arranged in concentric form, and successively joined through a helical spline. The revolution phase between the inner cylindrical member 3 and the outer cylindrical member 4 is varied by the quantity corresponding to the displacement quantity of the annular pistons 11 and 12 and the torsional angle of the helical spline, by shifting each annular piston 11, 12 in the axial direction by the fluid pressure which varies in correspondence with the variation of the number of engine revolution. The annular piston 11 sets the meshing region of the helical spline smaller than that of another annular piston 12 meshed with the helical spline, inner cylindrical member 3 or the outer cylindrical member 4. Accordingly, the engine performance can be improved by carrying out the proper valve timing control.
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公开(公告)号：JP2003237404A
公开(公告)日：2003-08-27
申请号：JP2002042610
申请日：2002-02-20
Applicant: MAZDA MOTOR
Inventor： ASAI AKIRA
Abstract: PROBLEM TO BE SOLVED: To provide a structure for installing an engine auxiliary machine capable of avoiding a retreat of a master cylinder by a pressure from the engine auxiliary machine, and capable of reducing damage of the engine auxiliary machine itself even if an engine retreats by external force from the front when installing the engine auxiliary machine on the engine having a crankshaft directed in the car body width direction. SOLUTION: OCV 41 having the longitudinal direction in the car body longitudinal direction is installed on an upper surface of a head cover 13 of the engine 1 mounted in a transversely installed state. In this case, a front end part of the OCV 41 overlaps with an extension line Y of the axis of the forward projecting master cylinder 22 installed on the car body in the rear of the OCV 41, and the rear end part is inclined so as to point to the inside in the car body width direction from the extension line Y. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JPH0726921A
公开(公告)日：1995-01-27
申请号：JP19403293
申请日：1993-07-09
Applicant: MAZDA MOTOR
Inventor： FUKUMA MASANARI , DEGUCHI HIROAKI , NISHIDA MASAMI , ASAI AKIRA
Abstract: PURPOSE:To prevent occurrence of knocking sound caused by backlash, by engaging a helical spline shaft in a helical spline hole so as to relatively rotate a cam shaft and a cam pulley shaft, and by applying hydraulic oil in the helical spline meshing space. CONSTITUTION:A torque given by the rotation of a cam pulley 2 by an engine is transmitted from a helical spline hole 23 in an inner rotor 18 to a helical spline shaft 24 of a cam shaft 1, and accordingly, the cam shaft 1 and the cam 3 are rotated simultaneously with the drive of an oil pump 14. Upon change-over of valve timing, the oil pressure discharged from the oil pump 14 is fed into a hydraulic port 31 or 32 of a hydraulic cylinder 4, and a cam shaft 1 is shifted by means of a piston 5. In association with the shifting of the cam shaft 1, the cam shaft 1 and the cam pulley 2 are angularly displaced, relative to each other. Further, at this time, the pressure oil in the pump chamber 26 is fed into the helical spline meshing space through a gap 27, thereby it is possible to prevent occurrence of knocking sound caused by backlash.
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公开(公告)号：JPH06280525A
公开(公告)日：1994-10-04
申请号：JP7169293
申请日：1993-03-30
Applicant: MAZDA MOTOR
Inventor： NISHIDA MASAMI , DEGUCHI HIROAKI , FUKUMA MASANARI , ASAI AKIRA
Abstract: PURPOSE:To provide a valve timing control device for an engine which can vary opening/closing timings and a lifting rate of a tappet, and has a simple and compact structure. CONSTITUTION:A first and a second rotational members 17, 20 which respectively are in press-contact with a rear end of a cam shaft 3 for united rotation are provided. The first rotational member 17 is screwed with the second rotational member 20 through a screwing part 25. When rotational phase difference is generated between the rotational members 17 and 20, the rotational members 17 and 20 are relatively displaced in a front and back direction, and the can shaft 3 is moved in the front and back direction. The rotation of the first and second rotational members 17, 20 is stopped by means of a first and a second stoppers 27, 29, so that the cam shaft 3 is moved in the front and back direction, and a valve timing control device 7 is simplified.
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公开(公告)号：JPH06272524A
公开(公告)日：1994-09-27
申请号：JP6417693
申请日：1993-03-23
Applicant: MAZDA MOTOR
Inventor： ASAI AKIRA , NISHIDA MASAMI , FUKUMA MASANARI
Abstract: PURPOSE:To compact the whole of a valve system by setting each cam surface of driving cams and oscillating cams so that an acceleration component by the oscillating cams becomes larger than an acceleration component by the driving cams in a positive acceleration region in an acceleration characteristic of valve lift. CONSTITUTION:Cam shapes of cam surfaces 7a, 8a of each of driving cams 7, 8 and cam surfaces 41, 51 of each of oscillating cams 4, 5 are set so that an acceleration component by the oscillating cams 4, 5 becomes larger than an acceleration component by the driving cams 7, 8 in a positive acceleration region in an acceleration characteristic of valve lift. Consequently, the oscillating cams 4, 5 can secure the maximum valve lift of a valve at a smaller oscillating angle and can shorten cam noses of the driving cams 7, 8 to drive them by the amount of the oscillating angle of the oscillating cams 4, 5 reduced. Consequently, it is possible to compact a valve system.
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Patent Agency Ranking
公开(公告)号：JPH0617626A
公开(公告)日：1994-01-25
申请号：JP17711192
申请日：1992-07-03
Applicant: MAZDA MOTOR
Inventor： NISHIDA MASAMI , FUKUMA MASANARI , ASAI AKIRA
Abstract: PURPOSE:To reduce the number of slidable contact parts necessary to oscillate an oscillating cam to lift an intake valve or an exhaust valve of an engine and to reduce the number of parts. CONSTITUTION:An oscillating cam 12 is oscillated in the slidably contacted condition with an intake or an exhaust valve 10 of the engine through a lash adjuster 11, and the valve 10 is lifted by the oscillation. A fundamental circular part 12b not to lift the valve 10 even when being brought into contact in a slidable manner, and a lift circular part 12c to lift the valve 10 when being brought into contact in a slidable manner are formed on a cam surface 12a of the oscillating cam 12. A roller 16 is abutted a driving cam 14, and oscillated followed by the rotation of the driving cam 14, and at the same time, the roller is held by the oscillating cam 12 so as to oscillate the oscillating cam 12. The opening/closing timing of the valve 10 is changed when the distance between the point of contact of the roller 16 where the fundamental circular part 12b of the oscillating cam 12 is brought into slidable contact with the valve 10 and the center of oscillation of the oscillating cam 12 is changed.
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公开(公告)号：JPH0617623A
公开(公告)日：1994-01-25
申请号：JP17707992
申请日：1992-07-03
Applicant: MAZDA MOTOR
Inventor： NISHIDA MASAMI , FUKUMA MASANARI , ASAI AKIRA
Abstract: PURPOSE:To securely prevent the impact noise generated in an intake valve or an exhaust valve or the breakage of the suction valve or the exhaust valve when the intake valve or the exhaust valve is lifted by an oscillating cam. CONSTITUTION:A fundamental circular part where a valve is not lifted even when the fundamental circular part may directly or indirectly be brought into contact with the intake valve or the exhaust valve in a slidable manner, and a lift circular part to be formed adjacent to the fundamental circular part where the valve is lifted when the lift circular part may directly or indirectly be brought into contact with the valve are formed on a cam surface 12a of an oscillating cam 12. A buffer circular part to more gently lift the valve than the other part in the lift circular part when being brought into contact in a slidable manner is provided on the part of the lift circular part adjacent to the fundamental circular part.
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公开(公告)号：JP2006300018A
公开(公告)日：2006-11-02
申请号：JP2005126164
申请日：2005-04-25
Applicant: Mazda Motor Corp , マツダ株式会社
Inventor： ASAI AKIRA
IPC: F01L1/34
Abstract: PROBLEM TO BE SOLVED: To provide an engine variable valve timing device with a position restricting mechanism having simple construction for improving durability.
SOLUTION: The position restricting mechanism 100 has a bottomed hole portion 101a provided in the side face of a rotor 35 forming a timing delaying hydraulic pressure chamber 39 of a vane 37, a movable pin member 102 mounted in the bottomed hole portion 101a movably forward/backward to/from the timing delaying hydraulic pressure chamber 39, a communication passage 103 for supplying hydraulic pressure from the timing delaying hydraulic pressure chamber 38 to the back of the movable pin member 102 in the bottomed hole portion 101a, and a check valve 104 for holding the hydraulic pressure introduced into the back of the movable pin member 102 via the communication passage 103. The thermal expansion coefficient of a holder 102 having the bottomed hole portion 101a is greater than the thermal expansion coefficient of the movable pin member 102.
COPYRIGHT: (C)2007,JPO&INPITAbstract translation: 解决的问题：提供具有简单结构的位置限制机构的发动机可变气门正时装置，以提高耐久性。 解决方案：位置限制机构100具有设置在转子35的侧面中的底孔部101a，其形成叶片37的定时延迟液压室39，安装在有底孔部101a中的可动销构件102 从定时延迟液压室39向前/向后移动的连通通道103，用于从定时延迟液压室38向底孔部分101a中的可动销构件102的后部提供液压的连通通道103， 阀104用于保持通过连通通道103引入到可动销构件102的背面的液压。具有有底孔部101a的保持器102的热膨胀系数大于可动销构件102的热膨胀系数 。版权所有（C）2007，JPO＆INPIT
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公开(公告)号：JP2004332625A
公开(公告)日：2004-11-25
申请号：JP2003129820
申请日：2003-05-08
Applicant: Mazda Motor Corp , マツダ株式会社
Inventor： DEGUCHI HIROAKI , ASAI AKIRA
CPC classification number: Y02T10/18
Abstract: PROBLEM TO BE SOLVED: To secure reliability of a chain tensioner without impairing reliability of a variable valve timing mechanism, in a variable valve timing device for an engine, equipped with the hydraulic variable valve timing mechanism, a hydraulic control valve, the hydraulic chain tensioner, and an oil path.
SOLUTION: The variable valve timing device for an engine, comprises; the variable valve timing mechanism; the hydraulic control valve; the oil path; a chain abnormality detecting device detecting an abnormal state of a chain; and a control device controlling the hydraulic control valve. When an abnormal state of the chain is determined by the chain abnormality detecting device, a memory part of the control device stores information on the abnormal state, and a flag becomes 1. In the case where the flag is 1 and it is determined that a starter is in an ON state, the control device controls a duty ratio of the hydraulic control valve to become 0% to close the hydraulic control valve.
COPYRIGHT: (C)2005,JPO&NCIPI-
公开(公告)号：JPH11210428A
公开(公告)日：1999-08-03
申请号：JP1754498
申请日：1998-01-29
Applicant: MAZDA MOTOR
Inventor： ASAI AKIRA , ITO KAZUTOSHI , DEGUCHI HIROAKI
Abstract: PROBLEM TO BE SOLVED: To accurately detect a camshaft rotation by installing a rotating plate having a part to be detected on a camshaft at an appropriate position. SOLUTION: A camshaft rotation detecting sensor comprises a rotating plate 8 mounted on a camshaft 1 for driving an intake valve or an exhaust valve of an engine and a cam position sensor 7 mounted on a cylinder head cover 11. The rotating plate 8 is disposed between a journal part 1a provided on one end part side of the camshaft 1 and the installation part of a cam body 14 provided at the center part side of the camshaft 1, and an oil control valve 6 for feeding oil to oil paths 9 and 10 formed in the one end part of the camshaft 1 is disposed on the upper part of the journal part 1a. Then a cam position sensor 7 is installed aslant at a position adjacent to the oil control valve 6 so that it faces the part to be detected 8a of the rotating plate 8.
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