WO2015087649A1 - 内燃機関のバルブタイミング制御装置 - Google Patents
内燃機関のバルブタイミング制御装置 Download PDFInfo
- Publication number
- WO2015087649A1 WO2015087649A1 PCT/JP2014/079800 JP2014079800W WO2015087649A1 WO 2015087649 A1 WO2015087649 A1 WO 2015087649A1 JP 2014079800 W JP2014079800 W JP 2014079800W WO 2015087649 A1 WO2015087649 A1 WO 2015087649A1
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- WIPO (PCT)
- Prior art keywords
- timing control
- valve timing
- combustion engine
- internal combustion
- control device
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/20—Making machine elements valve parts
- B21K1/22—Making machine elements valve parts poppet valves, e.g. for internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/3443—Solenoid driven oil control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34453—Locking means between driving and driven members
- F01L2001/34456—Locking in only one position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34453—Locking means between driving and driven members
- F01L2001/34469—Lock movement parallel to camshaft axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34479—Sealing of phaser devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/3445—Details relating to the hydraulic means for changing the angular relationship
- F01L2001/34483—Phaser return springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0215—Variable control of intake and exhaust valves changing the valve timing only
- F02D13/0219—Variable control of intake and exhaust valves changing the valve timing only by shifting the phase, i.e. the opening periods of the valves are constant
Definitions
- the present invention relates to a valve timing control device for an internal combustion engine that variably controls the opening and closing timing of an intake valve and an exhaust valve according to an operating state.
- Patent Document 1 As a conventional valve timing control device for an internal combustion engine, one described in Patent Document 1 below is known.
- a housing body in which a rotational force is transmitted from a crankshaft and a plurality of hydraulic oil chambers are provided on the inner periphery, a plate body that closes a front end opening of the housing body with an inner end surface, and the plate body
- a front plate having a cylindrical portion at the center of an outer end surface (outer end surface) and a relative rotation to the most retarded angle side and the most advanced angle side within a predetermined angle range with respect to the housing main body, are provided in the hydraulic oil chamber.
- a vane rotor having four vanes that are divided into a square oil chamber and an advanced oil chamber, a part of which is accommodated in the cylindrical portion of the front plate, and one end portion is locked to the front end portion of the cylindrical portion;
- a torsion spring having an end portion locked to the vane rotor.
- the torsion spring urges the vane rotor to rotate relative to the advance side by the spring force, and controls the opening / closing timing of the exhaust valve to the advance side, thereby improving engine startability and the like. ing.
- one end opening of the housing body is closed at the inner end surface of the plate body of the front plate to seal each hydraulic oil chamber.
- the accuracy of the side clearance between the inner peripheral portion of the inner end surface of the plate body and the opposing surface of the vane rotor that faces the inner peripheral portion in the axial direction cannot be sufficiently increased.
- the present invention has been devised in view of the technical problem of the conventional valve timing control device, and can increase the sealing accuracy by increasing the surface area of the inner peripheral portion of the inner end surface of the plate body.
- the valve timing control device is provided.
- a rotational force is transmitted from the crankshaft and at least one end in the axial direction is formed as an opening, a rotor fixed to the camshaft, and an inner periphery of the housing body.
- a plurality of vanes that separate the retarded working chamber and the advanced working chamber between the plurality of shoes, and selectively supplying and discharging hydraulic oil in the retarded working chamber and the advanced working chamber
- a vane rotor configured to rotate relative to the retarding side or the leading side with respect to the housing body, and a disk-shaped plate that seals each working chamber by closing one end opening of the housing body with an inner end surface.
- a front plate having a main body and a cylindrical portion integrally projecting outward from a hole edge of a through-hole formed in the center of the plate main body, and one end portion locked to the rotor, while the other end portion is By being engaged with the cylindrical portion, always the vane rotor relative to the housing body, and a torsion spring for urging in one direction side of the rotational direction,
- the inner peripheral portion of the outer peripheral surface of the plate body near the root portion of the cylindrical portion is pushed into the inner end surface side to form a concave shape, and the inner peripheral portion of the inner end surface corresponding to the formation position of the concave portion,
- the section between the inner peripheral portion of the inner end surface and the inner peripheral surface of the cylindrical portion is formed in a substantially right-angle cross section.
- the present invention it is possible to increase the sealing accuracy on the inner peripheral portion side by suppressing the sagging of the inner peripheral portion of the inner end face of the plate body and enlarging the surface area. As a result, the leakage of hydraulic oil from each working chamber can be suppressed.
- FIG. 6 is a cross-sectional view taken along line AA in FIG. It is an enlarged view of the instruction line B part of FIG. It is an enlarged view of the instruction line C part of FIG. It is a side view which shows the cylindrical part of the front plate provided to this embodiment.
- FIG. 10 is a sectional view taken along line DD of FIG. 9.
- FIGS. 4A to 4F are schematic views showing a process of forming a front plate used in the present embodiment.
- the exhaust-side valve timing control device includes a sprocket 1 that is a driving rotary body that is rotationally driven via a timing chain by a crankshaft (not shown), and the sprocket 1 A camshaft 2 provided in a relatively rotatable manner, a phase changing mechanism 3 disposed between the sprocket 1 and the camshaft 2 for converting the relative rotational phase of the two and the camshaft 2, and the phase changing And a hydraulic circuit 4 for operating the mechanism 3.
- the sprocket 1 is formed in a thick disk shape with an iron-based metal, and has a gear portion 1a around which the timing chain is wound, and in the center, on the outer periphery of the camshaft 2 A support hole 1b that is rotatably supported is formed through. Further, four female screw holes 1c into which four bolts 9 to be described later are screwed are formed at substantially equal intervals in the circumferential direction of the outer peripheral portion of the sprocket 1.
- the sprocket 1 is configured as a rear cover that closes a rear end opening of a housing 5 described later.
- the camshaft 2 is rotatably supported by a cylinder head (not shown) via a cam bearing, and a plurality of egg-shaped drive cams that open and close the exhaust valve are integrally fixed at predetermined positions in the axial direction on the outer peripheral surface.
- a bolt insertion hole 2b through which a shaft portion 6a of a cam bolt 6 that fixes a vane rotor 7 described later from the axial direction is inserted is formed in the inner axial direction on the one end portion 2a side.
- a female screw (not shown) to which a male screw formed at the tip of the cam bolt 6 is screwed is formed at the tip of the bolt insertion hole 2b.
- the phase changing mechanism 3 is fixed to a housing 5 having an operation chamber inside and a cam bolt 6 at one end of the camshaft 2 so as to be relatively rotatable in the housing 5.
- the working chamber is constituted by a vane rotor 7 that is a driven rotating body housed in a housing 5, four first to fourth shoes 8 a to 8 d that are integrally provided on an inner peripheral surface of a housing body 5 a described later of the housing 5, and the vane rotor 7.
- the housing 5 includes a housing body 5a formed of a sintered metal in a cylindrical shape, a front plate 12 that closes a front end opening of the housing body 5a, and the sprocket 1 as a rear cover that closes a rear end opening. It is configured.
- the housing body 5a, the front plate 12, and the sprocket 1 are fastened together by the four bolts 9 that pass through the bolt insertion holes 8e of the shoes 8a to 8d.
- the front plate 12 is formed by integrally forming a plate material made of carbon steel by a unique press molding method of a press molding machine to be described later, and as shown in FIGS. 1, 2, and 4 to 6, the front plate 12 has a disk shape.
- the plate main body 13 is formed, and the cylindrical portion 14 is integrally formed by press molding at the center of the plate main body 13.
- the plate main body 13 is formed with a through hole 13a having a comparatively large diameter that is also a part of the cylindrical portion 14 at a central position, and the cylindrical portion 14 is integrated with a hole edge of the outer end surface 13d of the through hole 13a. Projected to That is, the cylindrical portion 14 is bent forward from the inner end surface 13e side of the plate body 13, and the inner diameter of the through hole 13a and the inner peripheral surface 14a of the cylindrical portion 14 are set to the same diameter. Are formed continuously in the axial direction.
- the plate body 13 has four bolt insertion holes 13b through which the bolts 9 are inserted at circumferentially equidistant positions on the outer peripheral portion, and holes on the outer end surface 13d side of the bolt insertion holes 13b.
- An annular tapered counterbore portion is formed on the edge to fit the base portion of the shaft portion of each bolt 9.
- An annular seating surface 13c on which an end surface of the head portion 9a of the bolt 9 is seated is formed on the outer periphery of each counterbore portion.
- the cylindrical portion 14 projects forward from the outer end surface 13d of the plate main body 13 with a predetermined length, and has a tapered surface 14c having an arcuate longitudinal section formed on the outer peripheral surface on the front end surface 14b side.
- An arcuate cutout 14d is formed at a predetermined position in the circumferential direction within the relative rotation region of the first vane 18a having the maximum width.
- a first spring locking groove 14e which is a locking portion, is formed at one end edge of the cutout portion 14d that faces in the circumferential direction.
- the first spring locking groove 14 e is formed in a substantially rectangular shape and is hung from the projection 14 f side provided on the tip end surface 14 b side of the cylindrical portion 14 to the inside. It is formed in an arc shape, is formed substantially linearly from one end edge of this arc portion, and is further formed in an arc shape from the end edge of this linear portion.
- the first spring locking groove 14e is configured such that a first locking end 32a of a torsion spring 32, which will be described later, is locked from the circumferential direction, and the projection 14f is a first engagement of the torsion spring 32. It prevents that the toe part 32a falls off from the front end side.
- the first spring locking groove 14e has one inner end edge on the inner peripheral surface 14a side of the cylindrical portion 14, that is, an inner end locked by the first locking end portion 32a.
- An edge is formed on the circular arc surface 14g.
- the connecting portion of the plate 13 and the cylindrical portion 14 has a unique structure as shown in FIGS. 6 to 8, and this is formed at the time of press forming described later.
- the inner peripheral portion 13f of the inner end face 13e is pushed toward the axial direction of the cylindrical portion 14 (in the direction of the arrow in FIG. 7), and the cross-sectional shape of the inner peripheral portion 13f is formed in a substantially right-angled shape.
- the length L between the inner hole edge 13g of the inner peripheral portion 13f and the inner peripheral surface 14a of the cylindrical portion 14 is sufficiently small. Accordingly, the taper angle of the annular tapered surface 13h formed between the inner hole edge 13g of the inner peripheral portion 13f and the inner peripheral surface 14a of the cylindrical portion 14 is sufficiently small.
- annular recessed part 16 is provided in the cyclic
- the vane rotor 7 is integrally formed of, for example, a sintered metal material, and is fixed to the camshaft 2 by the cam bolt 6 inserted through the bolt insertion hole 7a formed at the center in the axial direction as shown in FIGS.
- the rotor 17 is formed in a substantially cylindrical shape, and a circular annular groove 17a is formed on the outer periphery of the outer end surface. On the other hand, the rotor 17 is fitted in a circular shape in which the front end portion 2b of the camshaft 2 is fitted. A joint groove 17b is formed. A second spring locking groove 17c is formed on the inner peripheral surface of the annular groove 17a. The second spring locking groove 17c is cut out in the axial direction (radial direction) of the bolt insertion hole 7a.
- the rotor 17 is configured such that one end surface in the axial direction on the camshaft 2 side is in sliding contact with the inner end surface facing the sprocket 1 with a minute side clearance.
- the other end surface in the axial direction is in sliding contact with the opposed inner end surface 13e of the plate body 13 of the front plate 12 with a minute side clearance, and the inner end surface of the sprocket 1 and the inner end surface 13e of the plate body 13 are formed.
- the seal function is demonstrated between.
- the first to fourth vanes 18a to 18d are arranged between the shoes 8a to 8d, and are formed on the respective arc-shaped outer peripheral surfaces.
- a seal member 15a that seals while sliding on the inner peripheral surface of the housing body 5a is fitted in the seal groove.
- seal members 15b that slide while sliding on the outer peripheral surface of the rotor 17 are fitted into the seal grooves formed on the inner peripheral surfaces of the tips of the shoes 8a to 8d.
- Each side surface in the width direction (rotor axial direction) of the vanes 18a to 18 is in sliding contact with the inner end surface of the sprocket 1 and the inner end surface 13e of the plate body 13 with a minute side clearance.
- a sealing function is exhibited between the inner end surface of the sprocket 1 and the inner end surface 13e of the plate body 13.
- each of the vanes 18a to 18d is formed such that the first vane 18a has a fan-shaped maximum width when viewed from the side and is heaviest, and the three second to fourth vanes other than the first vane 18a are formed.
- the widths 18b to 18d are set to substantially the same width smaller than that of the first vane 18a.
- the vane rotor 7 since the weight of the first vane 18a is the heaviest, the vane rotor 7 has its center of gravity Y (elliptical shaded portion in the figure) from the center point P1 to the first vane 18a as shown in FIG. It is close.
- the other second to fourth vanes 18b to 18d are in a separated state without coming into contact with the opposing side surfaces of the shoes 8c and 8d whose both side surfaces face each other in the circumferential direction. Accordingly, the contact accuracy between the first vane 18a and the first and second shoes 8a, 8b is improved, and the supply speed of the hydraulic pressure to each of the retard and advance hydraulic chambers 10, 11 is increased, and the vane rotor 7 is increased. The rotational responsiveness in the forward / reverse direction becomes higher.
- the retard hydraulic chambers 10 and the advance hydraulic chambers 11 are respectively connected to the hydraulic circuit 4 via first communication holes 10a and second communication holes 11a formed in the rotor 17 along the radial direction. Communicate.
- the hydraulic circuit 4 selectively supplies or discharges hydraulic oil (hydraulic pressure) to each of the retard and advance hydraulic chambers 10 and 11, and as shown in FIG.
- a retard oil passage 19 that supplies and discharges hydraulic pressure through the first communication hole 10a, and an advance oil that supplies and discharges hydraulic pressure to and from each advance hydraulic chamber 11 through the second communication hole 11a.
- the oil pump 21 is a general one such as a trochoid pump that is rotationally driven by an engine crankshaft.
- Each of the retard oil passage 19 and the advance oil passage 20 is connected at one end to the passage port of the electromagnetic switching valve 22, and the other end via an unillustrated cylinder head or cylinder block.
- the camshaft 2 is formed with a retard passage portion 19a and an advance passage portion 20a that are parallel along the axial direction.
- the retard passage portion 19a communicates with each retard hydraulic chamber 10 through the first communication hole 10a.
- the advance passage portion 20a communicates with each advance hydraulic chamber 11 through the second communication hole 11a.
- the electromagnetic switching valve 22 is a two-position three-port valve, and is provided with an unillustrated spool valve body that is slidable in the axial direction in the valve body by an unillustrated electronic controller. Is moved in the front-rear direction so that the discharge passage 21a of the oil pump 21 communicates with one of the oil passages 19 and 20, and at the same time, the other oil passage 19 and 20 and the drain passage 23 communicate with each other. ing.
- a filtration filter 25 is provided downstream of the discharge passage 21a of the oil pump 21, and a main oil gallery M / G that supplies lubricating oil to a sliding portion of the internal combustion engine or the like on the downstream side. Communicate.
- the oil pump 21 is provided with a flow rate control valve 26 that discharges excess hydraulic oil discharged from the discharge passage 21a to the oil pan 24 and controls it to an appropriate flow rate.
- the electronic controller is supplied from various sensors such as a crank angle sensor, an air flow meter, an engine water temperature sensor, a throttle valve opening sensor, and a cam angle sensor that detects the current rotational phase of the camshaft 2 by an internal computer.
- An information signal is input to detect the current engine operating state, and a control pulse current is output to the electromagnetic coil of the electromagnetic switching valve 22 to control the movement position of each spool valve body, thereby Switching control is performed.
- a lock mechanism is provided between the first vane 18a and the rear cover 1b of the sprocket 1 to restrain the vane rotor 7 at the most advanced angle position with respect to the housing 5.
- this locking mechanism is slidably accommodated in a sliding hole 27 formed through the first vane 18a in the direction of the internal axis, and can be moved forward and backward with respect to the rear cover 1b.
- a lock pin 28 provided at the center, a lock hole 29 that is formed at a predetermined position in the center of the rear cover 1b in the radial direction, and engages with a tip 28a of the lock pin 28 to lock the vane rotor 7.
- the engagement / disengagement mechanism engages / disengages the distal end portion 28a of the lock pin 28 with the lock hole 29 in accordance with the starting state.
- the lock pin 28 as a whole including the front end 28a is formed in a substantially cylindrical shape, and is shaped to be easily engaged in the lock hole 29 from the axial direction, and from the rear end side to the internal axial direction.
- a coil spring 30 is provided that is elastically mounted between the bottom surface of the formed groove and the inner surface of the front plate 12 and biases the lock pin 28 in the advance direction (the direction in which it is engaged).
- the lock hole 29 is formed larger than the outer diameter of the tip end portion of the lock pin 28, is formed at a position biased toward the advance hydraulic chamber 11 in the circumferential direction, and the lock pin 28 is engaged with the lock hole 29.
- the relative conversion angle between the housing 5 and the vane rotor 7 is set to be the most advanced position.
- a semi-arc-shaped pressure receiving chamber 31 is formed in a side portion of the lock hole 29 at a position smaller than the outer diameter of the lock pin 28 and one step lower than the lock hole 29.
- the engagement / disengagement mechanism supplies a hydraulic pressure to the coil spring 30 that urges the lock pin 28 in the advancing direction and a pressure receiving chamber 31 in the lock hole 29 to retreat the lock pin 28, and a release hydraulic pressure that is not shown.
- the hydraulic pressure selectively supplied to the retard hydraulic chamber 10 and the advanced hydraulic chamber 11 is supplied to the pressure receiving chamber 31 through a predetermined oil hole.
- the lock pin 28 acts in the backward direction.
- a torsion spring 32 for urging the vane rotor 7 in the advance direction with respect to the housing 5 is mounted inside the plate body 13 and the cylindrical portion 14 and inside the annular groove 17a of the rotor 17.
- the torsion spring 32 is a spring main body wound in a coil shape, and one end portion that is bent outward from the one end of the spring main body in the radial direction and protrudes outward.
- the first locking end portion 32a and the second locking end portion 32b which is the other end portion which is bent inward in the radial direction from the other end of the spring body and protrudes inward.
- the first locking end portion 32 a is locked and fixed in the first spring locking groove 14 e of the front plate 12 from the circumferential direction, while the second locking end portion 32 b is the second locking end portion 32 b of the rotor 17. 2 It is locked and fixed in the locking groove 17c from the axial direction. Due to the spring force of the torsion spring 32, the vane rotor 7 is always urged in the rotation direction on the advance side.
- the torsion spring 32 is deformed in the direction of diameter reduction when the vane rotor 7 rotates relative to the housing 5 toward the retard side.
- the front plate 12 is formed by a series of press forming steps shown in FIGS. 11A to 11F.
- a base material 12 ′ of a carbon steel front plate 12 is pre-formed into a disk shape by a press molding machine not shown, and a forming hole 14h for forming a cylindrical portion 14 ′ is formed at the center. 'To penetrate.
- the peripheral portion is pushed upward with the forming hole 14h 'as the center to gradually form the plate body 13' and the cylindrical portion 14 '(burring process).
- arc-shaped so-called sagging occurs due to press molding at the inner peripheral portion 14i of the connecting portion (base portion) between the plate body 13 'and the cylindrical portion 14'.
- the preform 12 ′ of the molded front plate 12 is positioned on the base 40 in which the insertion hole 40a is formed at a position corresponding to the cylindrical portion 14 ′.
- the support jig 41 is inserted into the cylindrical portion 14 'from above.
- the support jig 41 is formed in a stepped columnar shape, and the small-diameter portion 41a on the distal end side is set to an outer diameter slightly smaller than the inner diameter of the inner peripheral surface 14a ′ of the cylindrical portion 14 ′, and the inner peripheral surface 14a. Is placed close to.
- the large-diameter portion 41b of the support jig 41 and the step portion 41c of the small-diameter portion 41a face the tip surface 14b 'of the cylindrical portion 14' from the axial direction with a slight gap.
- the outer peripheral portion 14j of the base portion of the cylindrical portion 14 ' is pressed downward as indicated by the arrow by the pressing punch 42 disposed on the outer peripheral side of the support jig 41.
- the pushing punch 42 is provided with an annular pushing portion 42b having a sharp tip at the end of the lower end hole of the central insertion hole 42a.
- the inner peripheral surface 14 a ′ on the base side of the portion 14 ′ and the inner side in the vicinity of the through hole 13 a ′ of the plate body 13 ′ are defined by the outer peripheral surface of the support jig 41 and the upper surface near the insertion hole 40 a of the base 40. Supports against the pushing force.
- the inner peripheral portion of the plate body 13 is pushed in the direction of the arrow in FIG. 8, that is, in the axial direction of the cylindrical portion 14, so that the inner peripheral portion 13f of the inner end face 13e is as shown in FIG. It is pushed toward the axial direction of the cylindrical portion 14. Therefore, the inner peripheral portion 13f of the inner end face 13e is formed in a substantially right-angle cross section, and the surface area expands inward. As a result, the sagging due to the press described above is corrected.
- the punching punch 43 is pushed from the inside of the cylindrical portion 14 to the radially outer side (in the direction of the arrow), whereby the notched portion 14d and the first spring locking groove 14e shown in FIG. Is formed.
- the punching punch 43 has a distal end surface 43a formed in an arc shape having a curvature radius substantially the same as the curvature radius of the cylindrical portion 14, and an upper end edge 43b of the distal end surface 43a is on the axial center side (inner side) of the cylindrical shape 14. Since the first spring engaging groove 14e is punched and formed by moving outward in the radial direction, an arcuate surface 14g is formed on the inner edge shown in FIG.
- the base material 12 ′ of the front plate 12 is heat-treated at a predetermined time and temperature, and then, as shown in FIG.
- the four bolt insertion holes 13b are drilled at equal intervals in the circumferential direction at equal intervals in the circumferential direction.
- the annular seating portion 13c is formed by coining on the outer peripheral side of the hole edge on the outer end surface 13d side of each bolt insertion hole 13b.
- the inner end surface 13e of the plate body 13 and the front end surface 14b of the cylindrical portion 14 are so-called double-headed polishing so as to be sandwiched between the front and rear polishing machines 44a and 44b.
- the surface roughness of the inner end surface 13e can be increased, and the accuracy of the side clearance with the roller 17 can be increased.
- the electronic controller maintains the non-energized state of the electromagnetic coil of the electromagnetic switching valve 22.
- the discharge passage 18a of the oil pump 21 and the retard oil passage 19 are made to communicate with each other, and at the same time, the advance oil passage 20 and the drain passage 23 are made to communicate.
- the vane rotor 7 rotates to the left side (retarded side) in the drawing as shown by the one-dot chain line in FIG. 3, and one side surface of the first vane 18a rotates.
- the rotational position on the maximum retarding angle side is regulated by coming into contact with the opposite side surface of the first shoe 8a facing from the direction.
- the relative rotation angle of the vane rotor 7, that is, the camshaft 2 is converted to the most retarded angle side with respect to the housing 5.
- the torsion spring 32 is deformed in the diameter reducing direction.
- the vane rotor 7 rotates toward the advance side with respect to the housing 5, and the opposite side surface of the second shoe 8 b is opposed to the other side surface of the first vane 18 a from the circumferential direction.
- the rotational position on the maximum advance side is regulated by contacting.
- the relative rotation phase of the camshaft 2 with respect to the housing 5 is converted to the most advanced angle side.
- the opening / closing timing of the exhaust valve is controlled to the most advanced angle side, and the output of the engine in such a high rotation high load region can be improved.
- the front plate 12 is integrally formed by press molding using a relatively thin iron-based metal plate, the weight can be reduced and the manufacturing operation can be facilitated. Therefore, the cost can be reduced.
- the annular recess 16 is pushed into the inner peripheral portion on the outer end surface 13d side of the plate body 13 through the base portion of the cylindrical portion 14, and is formed by the punch 42, so that the inner peripheral portion 13f of the inner end surface 13e is substantially perpendicular. Since the seal surface can be expanded without sagging by forming the surface inward and the surface area is expanded inward, the sealing accuracy due to the side clearance with the other axial end surface of the rotor 17 is sufficiently increased. It becomes possible.
- the inner edge of the first spring locking groove 14e is an arcuate surface 14g, the first locking end 32a of the torsion spring 32 is locked in the first spring locking groove 14e.
- production of the damage of the 1st latching end part 32a outer surface can be suppressed.
- annular tapered surface 13h is formed between the inner hole edge 13g of the inner peripheral portion 13f and the inner peripheral surface 14a of the cylindrical portion 14, the deformation is particularly reduced when the torsion spring 32 is subjected to a diameter expansion deformation. Since it can be absorbed in the space formed by the annular tapered surface 13h, smooth deformation of the torsion spring 32 can be ensured. In addition, since the outer surface of the torsion spring 32 can be prevented from interfering with the inner peripheral surface 14a of the cylindrical portion 14 due to the space, damage to the outer surface and generation of a hitting sound can be eliminated.
- each seating surface 13c of the plate body 13 is also formed by press molding, the cost can be reduced as compared with the case of polishing.
- the center of gravity of the vane rotor 7 is biased toward the first vane 18a by the maximum width of the first vane 18a.
- the notch 14d of the cylindrical portion 14 and the first spring locking groove 14e Since the center of gravity of the front plate 12 is biased to the opposite side of the notch portion 14d and the first spring locking groove 14e, the excessive weight of the first vane 18a is offset.
- the weight balance of the entire valve timing control device can be achieved without providing a balance weight on the third vane 18c located on the opposite side of the first vane 18a, and the device is provided by the notch portion 14d and the first spring locking groove 14e. Can be reduced in weight.
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Abstract
Description
前記プレート本体の外端面の前記円筒部の根元部付近の内周部位を、前記内端面側に押し込んで凹状に形成すると共に、該凹部の形成位置に対応する前記内端面の内周部位を、前記押し込み力に抗して支持することにより、前記内端面の内周部位と前記円筒部の内周面との間を断面ほぼ直角状に形成したことを特徴としている。
〔第1実施形態〕
排気側のバルブタイミング制御装置(VTC)は、図1及び図2に示すように、図外のクランクシャフトによりタイミングチェーンを介して回転駆動される駆動回転体であるスプロケット1と、該スプロケット1に対して相対回転可能に設けられたカムシャフト2と、前記スプロケット1とカムシャフト2との間に配置されて、該両者1、2の相対回転位相を変換する位相変更機構3と、該位相変更機構3を作動させる油圧回路4と、を備えている。
〔フロントプレートの成形方法〕
そして、前記フロントプレート12は、図11A~Fに示す一連のプレス成形工程によって形成されるようになっている。
〔本実施形態における可変動弁装置の作用効果〕
まず、機関始動時は、図3に示すように、トーションスプリング32のばね力によってベーンロータ7を最大進角位置に付勢していると共に、この位置で予めロックピン28の先端部28aがロック穴29内に係入して、ベーンロータ7を始動に最適な進角側の相対回転位置に拘束している。このため、排気弁のバルブタイミングが最進角側へ安定的に制御されている。このことから、イグニッションスイッチをオン操作して始動が開始されると、スムーズなクランキングによって良好な始動性が得られる。
Claims (13)
- クランクシャフトから回転力が伝達され、軸方向の少なくとも一端が開口形成されたハウジング本体と、
カムシャフトに固定されたロータ及び前記ハウジング本体の内周に突設された複数のシューの間に遅角作動室と進角作動室とを隔成する複数のベーンを有し、前記遅角作動室と進角作動室内の作動油を選択的に給排することによって前記ハウジング本体に対して遅角側あるいは進角側に相対回転するように構成されたベーンロータと、
前記ハウジング本体の一端開口を内端面によって閉塞して前記各作動室を封止する円盤状のプレート本体及び該プレート本体の中央に穿設された貫通孔の孔縁から外方へ一体に突出した円筒部を有するフロントプレートと、
一端部が前記ロータに係止され、他端部が前記円筒部に係止されることにより、前記ハウジング本体に対して前記ベーンロータを常時回転方向の一方向側に付勢するトーションスプリングと、
を備え、
前記プレート本体の外端面の前記円筒部の根元部付近に、前記内端面側に押し込んで形成された凹部を有することを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項1に記載の内燃機関のバルブタイミング制御装置において、
前記プレート本体の貫通孔の内周面に、前記内端面側から前記円筒部方向へ下り傾斜状のテーパ面を形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項2に記載の内燃機関のバルブタイミング制御装置において、
前記凹部を、プレス成形によって形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項3に記載の内燃機関のバルブタイミング制御装置において、
前記凹部を、前記円筒部の根元部を囲むように円環状に形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項3に記載の内燃機関のバルブタイミング制御装置において、
前記フロントプレートのプレート本体と円筒部をプレス成形によって一体に形成すると共に、前記凹部をプレス成形する際に、前記プレート本体の内端面の前記凹部に対応する箇所を予め内側から支持することによって前記テーパ面を形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項2に記載の内燃機関のバルブタイミング制御装置において、
前記円筒部の先端縁から軸方向へ所定長さ切り欠くと共に、該切欠部の前記プレート本体側の端部に、前記円筒部の周方向へ切欠して前記トーションスプリングの一端部を係止する係止部を形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項6に記載の内燃機関のバルブタイミング制御装置において、
前記切欠部と係止部の内側周縁部を円弧状に形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - 請求項1に記載の内燃機関のバルブタイミング制御装置において、
前記プレート本体の外周部の円周方向位置に、前記ハウジング本体に結合させるボルトを挿通させる複数のボルト挿通孔を穿設すると共に、該ボルト挿通孔の前記外端面側の孔縁に前記ボルトの頭部が着座する着座面を形成したことを特徴とする内燃機関のバルブタイミング制御装置。 - クランクシャフトから回転力が伝達され、軸方向の少なくとも一端が開口形成されたハウジング本体と、
カムシャフトに固定されたロータ及び前記ハウジング本体の内周に突設された複数のシューの間に遅角作動室と進角作動室とを隔成する複数のベーンを有し、前記遅角作動室と進角作動室内の作動油を選択的に給排することによって前記ハウジング本体に対して遅角側あるいは進角側に相対回転するように構成されたベーンロータと、
前記ハウジング本体の一端開口を内端面によって閉塞して前記各作動室を封止する円盤状のプレート本体と、該プレート本体の中央に穿設された貫通孔の孔縁部を外側に折り曲げて外方へ一体に突出した円筒部と、を有するプレート本体と、
一端部が前記ロータに係止され、他端部が前記円筒部に係止されることにより、前記ハウジング本体に対して前記ベーンロータを常時、回転方向の一方向側に付勢するトーションスプリングと、
を備えた内燃機関のバルブタイミング制御装置の製造方法であって、
前記プレート本体をプレス基台上に固定する工程と、
前記円筒部の内部に該円筒部の内周面に沿った外形の円柱状の支持治具を予め挿通配置する工程と、
前記プレート本体の外端面の前記円筒部の根元部付近の内周部位を、パンチによって前記内端面側へ押し込んで凹状に形成すると同時に、前記支持治具によって前記円筒部の内端面の前記凹部に対応した内周部位を前記パンチの押し込み力に抗して押圧支持することにより、前記円筒部の内端面の内周部位を前記挿通孔方向へ引き延ばして表面積を拡大する工程と、を有することを特徴とする内燃機関のバルブタイミング制御装置の製造方法。 - 請求項9に記載の内燃機関のバルブタイミング制御装置の製造方法において、
前記円筒部の先端縁から軸方向へ所定長さ切り欠くと共に、該切欠部の前記プレート本体側の端部に、前記円筒部の周方向へ切欠して前記トーションスプリングの一端部を係止する係止部を形成したことを特徴とする内燃機関のバルブタイミング制御装置の製造方法。 - 請求項10に記載の内燃機関のバルブタイミング制御装置の製造方法において、
前記切欠部と係止部を、前記円筒部の内側からプレス成形機のパンチによって打ち抜き加工すると共に、該打ち抜き加工時に前記切欠部と係止部の内側周縁部を円弧状に形成したことを特徴とする内燃機関のバルブタイミング制御装置の製造方法。 - 請求項9に記載の内燃機関のバルブタイミング制御装置の製造方法において、
前記プレート本体の内端面全体と前記円筒部の先端面を、互いに軸方向から同時に研磨加工したことを特徴とする内燃機関のバルブタイミング制御装置の製造方法。 - 請求項9に記載の内燃機関のバルブタイミング制御装置の製造方法において、
前記プレート本体の外周部の円周方向位置に、前記ハウジング本体に結合させるボルトを挿通させる複数のボルト挿通孔を穿設すると共に、該ボルト挿通孔の前記外端面側の孔縁に前記ボルトの頭部が着座する着座面をコイニング加工によって形成したことを特徴とする内燃機関のバルブタイミング制御装置の製造方法。
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JP2017075567A (ja) * | 2015-10-15 | 2017-04-20 | 株式会社デンソー | バルブタイミング調整装置 |
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Publication number | Publication date |
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CN105793527B (zh) | 2019-06-21 |
JP6368008B2 (ja) | 2018-08-01 |
CN105793527A (zh) | 2016-07-20 |
JPWO2015087649A1 (ja) | 2017-03-16 |
JP2017172589A (ja) | 2017-09-28 |
US10082055B2 (en) | 2018-09-25 |
US20160273417A1 (en) | 2016-09-22 |
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