US20050252468A1 - Valve timing control device having vane rotor - Google Patents
Valve timing control device having vane rotor Download PDFInfo
- Publication number
- US20050252468A1 US20050252468A1 US11/125,079 US12507905A US2005252468A1 US 20050252468 A1 US20050252468 A1 US 20050252468A1 US 12507905 A US12507905 A US 12507905A US 2005252468 A1 US2005252468 A1 US 2005252468A1
- Authority
- US
- United States
- Prior art keywords
- housing
- control device
- timing control
- coil spring
- valve timing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- 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
- F01L1/02—Valve drive
- F01L1/022—Chain drive
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
-
- 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
- F01L1/02—Valve drive
- F01L1/024—Belt drive
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to a valve timing control device, and is preferably applied to a valve timing control device that changes opening and closing timing of at least one of an intake valve and an exhaust valve of a vehicular internal combustion engine in accordance with an operating condition, for example.
- a vane-type valve timing control device disclosed in JP-A-2001-82278 hydraulically controls a valve timing of at least one of an intake valve and an exhaust valve in accordance with a phase difference caused by a relative rotation between a chain sprocket and a camshaft.
- the vane-type valve timing control device drives the camshaft serving as a driven shaft via a driving force transmission member such as a timing pulley, which synchronously rotates with a crankshaft serving as a driving shaft, and the chain sprocket.
- an initial phase thereof in such an idling condition has to be on the advanced angular side opposite to load torque, which urges the vane rotor to the retarded angular side when the camshaft is driven.
- the valve timing control device disclosed in JP-A-2001-82278 includes a housing, a vane rotor, and an assist spring.
- the housing rotates with the driving force transmission member such as the chain sprocket.
- the vane rotor rotates with the camshaft, and the vane rotor is capable of rotating within an accommodation chamber formed in the housing.
- the assist spring applies force against the vane rotor in the advanced direction.
- the assist spring is constructed of a torsion coil spring. Both ends of the torsion coil spring are arranged along the axial direction. One end of both the ends of the torsion coil spring is secured to the vane rotor. The other end of the torsion coil spring is secured to the housing that accommodates the vane rotor such that the vane rotor is rotatable in both the advanced direction and the retarded direction.
- the other end of the torsion coil spring which axially extends, is secured to a spring securing portion on the side of the housing, and the spring securing portion overhangs to the frontside of the engine. Accordingly, the length of the valve timing control device, that is, the length of the engine may be enlarged.
- the other end of the torsion coil spring may be radially extended outwardly from the outer circumferential periphery of the torsion coil spring.
- the housing includes island portions that are circumferentially arranged in the accommodation chamber formed in the housing to receive the vane rotor.
- a hooking member such as a pin is secured to the island portion by pressure insertion or the like, so that the other end of the torsion coil spring is capable of hooking to the pin.
- Each of the island portions which are circumferentially arranged in the accommodation chamber that receives the vane rotor, is preferably reduced in width relative to the rotative direction thereof to enlarge a range of advanced angle of the vane rotor.
- a bolt shank of a bolt is capable of being inserted through a hole, which is formed in the island portion.
- the bolt serves as a securing member to secure the driving force transmission member such as the chain sprocket to the housing.
- the torsion coil spring in which the other end radially outwardly extends, is applied to the valve timing control device, the bolt, specifically a bolt head and the pin may be hard to be arranged within the island portion, which is preferably formed small in width relative to the rotative direction.
- valve timing control device that includes a vane rotor, a housing, a torsion coil spring urging the vane rotor in the advanced direction or in the retarded direction relative to the housing, in a manner that a range of an advanced angle between island portions, which are circumferentially arranged within the accommodation chamber receiving the vane rotor, can be enlarged.
- the valve timing control device includes a hooking member, to which an end of the torsion coil spring hooks, and a securing member such as a screwing member, in a manner that the hooking member and the securing member can be arranged in the island portion.
- a valve timing control device is provided to a driving force transmission system, which transmits driving force from a driving shaft of an internal combustion engine to a driven shaft.
- the driven shaft opens and closes at least one of an intake valve and an exhaust valve.
- the valve timing control device controls an opening timing and a closing timing of at least one of the intake valve and the exhaust valve.
- the valve timing control device includes a housing member, a vane rotor member, a torsion coil spring, a hooking member, and a securing member.
- the housing member rotates with one of the driving shaft and the driven shaft.
- the housing member defines multiple accommodation chambers that include multiple island portions to be adjacent to each other in a circumferential direction of the accommodation chambers.
- the vane rotor member is accommodated in the accommodation chambers.
- the vane rotor member includes a vane portion, which is restricted in rotation within a predetermined rotative angular range defined by the plurality of island portions.
- the torsion coil spring has one end that hooks on the housing member.
- the torsion coil spring has another end that hooks to the vane rotor member.
- the torsion coil spring biases the vane rotor member to one of an advanced angular side and a retarded angular side with respect to the housing member.
- the hooking member circumferentially hooks on the one end of the torsion coil spring.
- the one end of the torsion coil spring extends to a radially outer side.
- the securing member secures a member of the driving force transmission system to the housing member.
- the hooking member and the securing member are provided to at least one of the island portions.
- the hooking member and the securing member are arranged in this order along a direction, in which resilience of the torsion coil spring works.
- the width of the island portion in a rotative angular direction can be decreased.
- the advanced angular range, in which the vane portion is rotatable between corresponding island portions in the circumferential direction can be further increased.
- FIG. 1 is a schematic view showing a valve timing control device according to an embodiment of the present invention
- FIG. 2 is a partially perspective front view showing the valve timing control device according to the embodiment
- FIG. 3 is a front view showing the valve timing control device taken along the line III-III in FIG. 1 ;
- FIG. 4A is a segmentary view showing a condition, in which a torsion coil spring hooks to a pin in the valve timing control device
- FIG. 4B is a side view showing the condition, in which the torsion coil spring hooks to the pin according to the embodiment
- FIG. 5A is a segmentary view showing a condition, in which a torsion coil spring hooks to a pin in a valve timing control device
- FIG. 5B is a side view showing the condition, in which the torsion coil spring hooks to the pin, according to a first comparative example
- FIG. 6A is a segmentary view showing a condition, in which a torsion coil spring hooks to a pin in a valve timing control device
- FIG. 6B is a side view showing the condition, in which the torsion coil spring hooks to the pin, according to a second comparative example.
- a valve timing control device 1 includes a shoe housing 10 and a sprocket portion 30 .
- the shoe housing 10 serves as a housing member.
- the sprocket portion 30 is constructed of a bush portion (bush) 32 and a sprocket 33 .
- the bush 32 receives a camshaft 4 , which serves as a driven shaft, therethrough.
- the sprocket 33 has gears 33 b on the outer circumferential periphery thereof.
- Driving force is transmitted from a crankshaft 210 to the sprocket 33 via a driving force transmission member 211 such as a timing chain 211 or a timing belt 211 , so that the sprocket 33 rotates synchronously with the crankshaft 210 .
- a timing chain 211 is used as the driving force transmission member.
- the crankshaft 210 serves as a driving shaft of an internal combustion engine 300 .
- Driving force is transmitted from the sprocket portion 30 , specifically, from the sprocket 33 to the camshaft 4 , so that the camshaft 4 opens and closes an exhaust valve 201 .
- the camshaft 4 is capable of rotating at a predetermined phase difference with respect to the sprocket portion 30 .
- the timing chain 211 and the sprocket portion 30 construct the driving force transmission member for a driving force transmission system.
- the driving force transmission member transmits driving force of the crankshaft 210 to the camshaft 4 .
- the sprocket 33 and the bush 32 are secured using a bolt 34 to integrally construct the sprocket portion 30 .
- the sprocket portion 30 and the camshaft 4 rotate in the clockwise direction (advanced direction) when being viewed from the left direction in FIG. 1 .
- the shoe housing 10 and the sprocket portion 30 construct a rotative body, which rotates synchronously with the crankshaft 210 , on the driving side.
- the shoe housing 10 and the sprocket portion 30 are coaxially secured to each other using a bolt 31 .
- the shoe housing 10 is constructed of a substantially cylindrical circumferential wall (shoe housing portion) 11 and a substantially flat plate shaped front plate (front plate portion) 12 .
- the circumferential wall 11 and the front plate 12 are secured to the sprocket portion 30 using the bolt 31 to be integral in a substantially bowl shape.
- the circumferential wall 11 and the front plate 12 are not limited to be individual members, and may be an integral member.
- the shoe housing 10 specifically, the circumferential wall 11 includes island portions (shoes) 10 a , 10 b , 10 c , 10 d that are formed in a substantially trapezoid shape relative to the axial direction of the shoe housing 10 .
- the shoes 10 a , 10 b , 10 c , 10 d are arranged along the circumferential direction of the circumferential wall 11 at substantially regular intervals.
- the circumferential wall 11 is formed with shoes 10 a , 10 b , 10 c , 10 d that are arranged in an order from the shoe 10 a , into which a pin (hooking member) 22 is press-inserted, the shoe 10 b , the shoe 10 c , and the shoe 10 d along the clockwise direction.
- the shoes 10 a , 10 b , 10 c , 10 d form four spaces therebetween along the circumferential direction thereof. As referred to FIG. 3 , the four spaces among the shoes 10 a , 10 b , 10 c , 10 d form accommodation chambers 14 .
- Each accommodation chamber 14 accommodates each of vane portions (vanes) 50 a , 50 b , 50 c , 50 d serving as vane rotor members.
- Each shoe 10 a , 10 b , 10 c , 10 d has an inner wall surface that is respectively formed in a substantially arc shape in cross section. The inner wall surface of each shoe 10 a , 10 b , 10 c , 10 d partitions each accommodation chamber 14 .
- the vanes 50 a , 50 b , 50 c , 50 d which are circumferentially arranged at substantially regular intervals, construct a rotor 50 .
- Each vane 50 a , 50 b , 50 c , 50 d is accommodated in each accommodation chamber 14 , such that each vane 50 a , 50 b , 50 c , 50 d partitions each accommodation chamber 14 into a retarded angular hydraulic chamber and an advanced angular hydraulic chamber.
- the rotor 50 and the vanes 50 a , 50 b , 50 c , 50 d construct a vane rotor member.
- Each vane 50 a , 50 b , 50 c , 50 d rotates within each accommodation chamber 14 , i.e., between shoes, while being restricted in rotative angle within a predetermined rotative angular range (advanced angular range) ⁇ .
- a positioning pin 51 is provided between the rotor 50 and the camshaft 4 for positioning the valve timing control device 1 with respect to the camshaft 4 .
- the rotor 50 is positioned to be in a positioning angle using the positioning pin 51 , subsequently, the rotor 50 is secured integrally with the camshaft 4 using a bolt 20 .
- the rotor 50 , the vanes 50 a , 50 b , 50 c , 50 d , and the positioning pin 51 construct a rotative body, which rotates synchronously with the camshaft 4 on the driven side.
- the camshaft 4 , the rotor 50 , the vanes 50 a , 50 b , 50 c , 50 d are capable of rotating coaxially with respect to the shoe housing 10 and the sprocket portion 30 .
- each of shoe seals 53 engages with each outer periphery of each vane 50 a , 50 b , 50 c , 50 d .
- Each outer circumferential wall of each vane 50 a , 50 b , 50 c , 50 d and each inner circumferential wall of the circumferential wall 11 forms a small clearance therebetween.
- the shoe seal 53 restricts working fluid from leaking between the retarded angular hydraulic chamber and the advanced angular hydraulic chamber thorough the clearance.
- the shoe seal 53 is urged onto the inner circumferential wall of the circumferential wall 11 by resilience of a leaf spring (not shown).
- Each of shoe seals 53 is also respectively provided into each clearance formed between the outer circumferential periphery of the rotor 50 and each inner wall of the shoes 10 a , 10 b , 10 c , 10 d of the inner circumferential wall of the circumferential wall 11 .
- a stopper piston 71 which is in a substantially cylindrical shape, is accommodated in the vane 50 d to be slidable along the axial direction of the camshaft 4 .
- An engaging ring 72 is press-inserted into a recess formed in the sprocket portion 30 , specifically formed in the bush 32 .
- the stopper piston 71 is capable of engaging with the engaging ring 72 .
- a spring 73 urges the stopper piston 71 to the side of the engaging ring 72 .
- the stopper piston 71 has a tip end that is capable of engaging with the engaging ring 72 , when the vane rotor 50 is at the most advanced angular position with respect to the shoe housing 10 .
- the vane rotor 50 is restricted from rotating with respect to the shoe housing 10 , when the stopper piston 71 engages with the engaging ring 72 .
- the stopper piston 71 is circumferentially displaced relative to the engaging ring 72 , so that the stopper piston 71 does not engage with the engaging ring 72 .
- the stopper piston 71 may be accommodated in a guide ring, which is press-inserted into the vane 50 d ( FIG. 3 ), such that the stopper piston 71 is slidable along the axial direction of the camshaft 4 .
- the stopper piston 71 and the engaging ring 72 construct a rotative angular phase latching means 70 .
- the rotative angular phase latching means 70 is capable of latching the shoe housing 10 onto the vane rotor 50 at an intermediate position in the predetermined rotative angular range. That is, the rotative angular phase latching means 70 is capable of latching the rotative body, which is on the driving side, onto the rotative body, which is on the driven side, at the intermediate position in the predetermined rotative angular range.
- the intermediate position is the most advanced angular position in the predetermined rotative angular range.
- the shoe 10 a and the vane 50 a form an advanced angular hydraulic chamber therebetween.
- the shoe 10 b and the vane 50 b form an advanced angular hydraulic chamber therebetween.
- the shoe 10 c and the vane 50 c form an advanced angular hydraulic chamber therebetween.
- the shoe 10 d and the vane 50 d form an advanced angular hydraulic chamber therebetween.
- the shoe 10 b and the vane 50 a form a retarded angular hydraulic chamber therebetween.
- the shoe 10 c and the vane 50 b form a retarded angular hydraulic chamber therebetween.
- the shoe 10 d and the vane 50 c form a retarded angular hydraulic chamber therebetween.
- the shoe 10 a and the vane 50 d form a retarded angular hydraulic chamber therebetween.
- hydraulic paths 91 , 92 respectively connect to a switching valve 100 via hydraulic paths 93 , 94 .
- a hydraulic supply path 101 is connected to a hydraulic pump 102 , so that oil is supplied from the hydraulic pump 102 through the hydraulic supply path 101 .
- a hydraulic exhaust path 103 opens to a drain 104 , so that oil is exhausted toe the drain 104 through the hydraulic exhaust path 103 .
- the hydraulic pump 102 pumps working fluid from the drain 104 , so that the hydraulic pump 102 supplies the working fluid to respective hydraulic chambers through the switching valve 100 .
- the switching valve 100 is a guide valve with 4 ports.
- the switching valve 100 has a valve member 105 that is urged by a spring 106 to one side.
- the valve member 105 reciprocates by energizing and de-energizing a solenoid 107 .
- the solenoid 107 is controlled in emerging condition by an ECU serving as a control means (not shown).
- the valve member 105 reciprocates in the switching valve 100 , so that a combination of communication and a combination of blockade can be switched among the hydraulic paths 93 , 94 , the hydraulic supply path 101 , and the hydraulic exhaust path 103 .
- working fluid can be supplied from the hydraulic pump 102 to the advanced angular hydraulic chamber, the retarded angular hydraulic chamber, and a hydraulic chamber 121 ( FIG. 1 ), besides, hydraulic fluid can be exhausted from respective hydraulic chambers to the drain 104 .
- a spring (torsion coil spring) 21 is accommodated in a substantially annular accommodating portion formed in a spring plate 29 .
- the spring 21 has one end 21 a that hooks to the pin 22 , which protrudes from the front plate 12 .
- the spring 21 has the other end 21 b that hooks to a securing groove 54 a , which is formed in a bolt seat face 54 .
- the camshaft 4 receives load torque when the camshaft 4 drives the exhaust valve 201 .
- the load torque applied to the camshaft 4 fluctuates to both the positive side and the negative side thereof.
- the load torque applied to the positive side biases the rotor 50 to the retarded angular side with respect to the shoe housing 10 .
- the load torque applied to the negative side biases the rotor 50 to the advanced angular side with respect to the shoe housing 10 .
- Load torque works to the positive side, i.e., to the retarded angular side, on average.
- Resiliency of the spring 21 works as torque that rotates the rotor 50 to the advanced angular side with respect to the shoe housing 10 .
- the spring 21 applies torque to the rotor 50 in the advanced angular direction, and the torque applied by the spring 21 to the rotor 50 becomes maximum when the rotor 50 is in the most retarded angular position with respect to the shoe housing 10 .
- the spring 21 serves as an advanced angular assisting means that urges the rotor 50 to the advanced angular side, i.e., the rotative angular direction.
- the pin 22 is secured to the front plate 12 ( FIG. 2 ) and the circumferential wall 11 , specifically, the shoe 10 a by press-insertion or the like.
- Each shoe 10 a , 10 b , 10 c , 10 d has a bolt hole 11 t , through which the bolt 31 is capable of being inserted.
- the shoe 10 a has a pin hole 11 p , through which the pin 22 is press-inserted, in addition to the bolt hole 11 t.
- Each circumferential wall of each shoe 10 b , 10 c , 10 d restricts the vane in rotative angle.
- Each circumferential wall of each shoe 10 b , 10 c , 10 d has a width that is shown by a rotative angle range A 2 in FIG. 2 .
- the circumferential wall of the shoe 10 a also restricts the vane in rotative angle.
- the circumferential wall of the shoe 10 a has a width that is shown by a rotative angle range A 1 .
- the pin hole 11 p is formed in the shoe 10 a in addition to the bolt hole 11 t , accordingly, A 1 becomes greater than A 2 .
- the bolt 31 includes a bolt shank 31 a and a bolt head 31 b .
- the bolt shank 31 a has a thread on the tip end thereof.
- the bolt head 31 b transmits screw torque, which is applied from the outside, to the bolt shank 31 a .
- the end face of the shoe housing 10 specifically, the surface of the front plate 12 forms a seat face of the bolt head 31 b .
- the pin 22 includes a pin shank (shank portion) 22 a and a pin head (disc portion) 22 b .
- the pin shank 22 a is press-inserted into the shoe 10 a , specifically, into the pin hole 11 p , so that the pin 22 is secured to the shoe 10 a .
- the pin head 22 b which is in a disc shape, is formed to be larger than the pin shank 22 a in diameter. Thereby, the pin head 22 b restricts the one end 21 a of the spring 21 from being detached from the pin shank 22 a of the pin 22 along the axial direction of the pin 22 due to spring back of the spring 21 or the like.
- the bolt 31 serves as a securing member (screwing member) that secures the shoe housing 10 , specifically, the circumferential wall 11 and the front plate 12 to the sprocket portion 30 .
- the pin 22 serves as a hooking means such that the one end 21 a , which radially extends from the spring 21 , hooks to the pin 22 in the circumferential direction.
- the pin 22 and the bolt 31 are arranged in the shoe 10 a .
- the pin 22 and the bolt 31 are arranged in this order along the direction, in which resilience (spring force) of the spring 21 works.
- the spring 21 resiliently urges the rotor 50 to the advanced angular side in the rotative angular direction.
- the pin 22 and the bolt 31 are arranged in the shoe 10 a such that the radially outer periphery of the pin shank 22 a of the pin 22 contacts with the radially outer periphery of the bolt head 31 b of the bolt 31 .
- the width, i.e., the angle A 1 of the shoe 10 a in the rotative direction can be reduced.
- the shoe 10 a can be downsized in the rotative direction.
- an advanced angular range of the vanes 50 a , 50 b , 50 c , 50 d can be further increased within the respective spaces formed among the shoes 10 a , 10 b , 10 c , 10 d .
- an advanced angular range of the vane rotor member which is constructed of the rotor 50 and the vanes 50 a , 50 b , 50 c , 50 d , can be further increased within the spaces such as the space between the shoes 10 a , 10 b and the space between the shoes 10 a , 10 d.
- the pin head 22 b contacts with the bolt head 31 b in the axial direction.
- a height of a member, which protrudes from the seat face of the front plate 12 is limited to a height, which is a sum of the height of the bolt head 31 b and the height of the pin head 22 b . Therefore, the height of the member, which protrudes from the end face of the shoe housing 10 , specifically, the height of the member, which protrudes from the surface of the front plate 12 in a substantially axial direction, can be reduced to a small degree.
- the valve timing control device 1 can be downsized relative to the axial direction.
- the pin 22 and the bolt 31 are provided to the shoe 10 a .
- the bolt 31 and the pin 22 are arranged in this order along the direction, in which resilience (spring force) of the spring 21 works.
- the pin 22 and the bolt 31 are arranged in the shoe 10 a such that the radially outer periphery of the pin shank 22 a contacts with the radially outer periphery of the bolt head 31 b .
- the width A 1 of the shoe 10 a in the rotative direction can be reduced.
- the pin shank 22 a needs to be extended from the bolt head 31 b by the diameter ⁇ C of the spring 21 in the axial direction thereof to contact the one end 21 a of the spring 21 circumferentially with the pin shank 22 a .
- the one end 21 a of the spring 21 does not circumferentially contact with the bolt head 31 b .
- the axial gap between the bolt head 31 b and the pin head 22 b is set to be B (B> ⁇ C), for example.
- the height of the pin shank 22 a is extended by the height B, compared with the structure in the embodiment described above.
- the pin shank 22 a needs to be extended by at least the diameter ⁇ C of the spring 21 , compared with the embodiment described above. Accordingly, a length, by which a member protrudes from the end face of the shoe housing 10 substantially along the axial direction, may increase.
- the pin 22 and the bolt 31 are provided to the shoe 10 a .
- the bolt 31 and the pin 22 are arranged in this order along the direction, in which resilience (spring force) of the spring 21 works, similarly to the first example.
- the pin 22 and the bolt 31 are arranged in the shoe 10 a such that the radially outer periphery of the pin shank 22 a does not contact with the radially outer periphery of the bolt head 31 b . That is, the radially outer periphery of the pin shank 22 a is apart from the radially outer periphery of the bolt head 31 b by a predetermined distance.
- a length, by which the pin 22 , specifically, the pin head 22 b protrudes from the end face of the shoe housing 10 substantially along the axial direction can be reduced to small degree.
- the spring 21 needs to be hooked to the pin shank 22 a of the pin 22 , which is assembled to the shoe 10 a , through a gap D between the pin head 22 b and the bolt head 31 b . Accordingly, a shortest gap between the pin 22 and the bolt 31 along the circumferential direction needs to be larger than the diameter ⁇ C of the spring 21 . That is, a gap D, which is formed between the radially outer periphery of the pin head 22 b and the radially outer periphery of the bolt head 31 b , needs to be larger than the diameter ⁇ C of the spring 21 .
- the width A 3 (A 3 >A 1 ) of the shoe 10 a increases by the gap D in the rotative direction, compared with the embodiment described above.
- valve timing control device having the above structure.
- working fluid is supplied to the hydraulic chamber 121 , which is arranged on the outer circumferential side of the stopper piston 71 .
- hydraulic pressure works onto the stopper piston 71 , so that the stopper piston 71 is pulled out of the engaging ring 72 .
- the vanes 50 a , 50 b , 50 c , 50 d , and the rotor 50 are rotatable relative to the shoe housing 10 and the sprocket portion 30 . Hydraulic pressure applied to each hydraulic chamber is controlled, so that a phase difference of the camshaft 4 is controlled with respect to the crankshaft 210 .
- the valve timing control device 1 includes a shoe housing 10 , the vane rotor member 50 , 50 a , 50 b , 50 c , 50 d , and the spring 21 .
- the vanes 50 a , 50 b , 50 c , 50 d are restricted in rotation angle within a predetermined rotation angular range, i.e., within an advanced angular range between the shoes 10 such as the shoes 10 a , 10 b or the shoes 10 a , 10 d formed in the shoe housing 10 , specifically, formed in the circumferential wall 11 .
- the one end 21 a of the spring 21 hooks on the shoe housing 10 .
- the other end 21 b of the spring 21 hooks on the vane rotor member 50 , 50 a , 50 b , 50 c , 50 d .
- the spring 21 biases the vane rotor member 50 , 50 a , 50 b , 50 c , 50 d to the advanced angular side or the retarded angular side with respect to the shoe housing 10 .
- the valve timing control device 1 further includes the pin 22 and the bolt 31 .
- the one end 21 a of the spring 21 extends to the radially outer side.
- the one end 21 a of the spring 21 hooks on the pin 22 in the circumferential direction.
- the bolt 31 secures the sprocket portion 30 with the shoe housing 10 .
- the pin 22 and the bolt 31 are arranged within the shoe 10 a in this order along the direction, in which resilience of the spring 21 is applied. Thereby, the advanced angular range of the vane rotor member 50 , 50 a , 50 b , 50 c , 50 d can be increased between the corresponding shoes, besides, the pin 22 and the bolt 31 can be arranged in the shoe 10 a .
- each vane 50 a , 50 b , 50 c , 50 d can be rotated between two of the corresponding shoes 10 a , 10 b , 10 c , 10 d in the circumferential direction within the predetermined rotation angular range.
- the predetermined rotation angular range can be increased, while the pin 22 and the bolt 31 can be provided to the shoe 10 a.
- the pin 22 and the bolt 31 are preferably arranged in the shoe 10 a in such a manner that the radially outer periphery of the pin shank 22 a and the radially outer periphery of the bolt head 31 b contact with each other.
- the width Al of the shoe 10 a in the rotative angular direction can be decreased.
- the advanced angular range, in which each vane 50 a , 50 b , 50 c , 50 d is rotatable between two of the corresponding shoes 10 a , 10 b , 10 c , 10 d in the circumferential direction can be further increased.
- the arrangement of the pin 22 and the bolt 31 in the shoe 10 a is not limited to the arrangement, in which the radially outer peripheries of the pin shank 22 a and the bolt head 31 b contact with each other for increasing the advanced angular range, in which each vane 50 a , 50 b , 50 c , 50 d are rotatable between two of the corresponding shoes 10 a , 10 b , 10 c , 10 d in the circumferential direction.
- any radially outer periphery of the pin 22 may contact with the radially outer periphery of the bolt head 31 b .
- the radially outer periphery of the pin head 22 b may contact with the radially outer periphery of the bolt head 31 b .
- the pin 22 and the bolt 31 are arranged within the shoe 10 a in such an order from the pin 22 to the bolt 31 along resilient force of the spring 21 .
- each vane 50 a , 50 b , 50 c , 50 d is rotatable between two of the corresponding shoes 10 a , 10 b , 10 c , 10 d in the circumferential direction, can be further increased, while the pin 22 and the bolt 31 can be provided to the shoe 10 a.
- the pin head 22 b axially contacts with the bolt head 31 b .
- the height of the member, which protrudes from the end face of the front plate 12 is limited to the height, which is the sum of the height of the bolt head 31 b and the height of the pin head 22 b . Therefore, the height of the member, which protrudes from the end face of the shoe housing 10 can be reduced.
- the valve timing control device 1 can be downsized relative to the axial direction.
- the shoe housing 10 includes the circumferential wall 11 , which includes the shoes 10 a , 10 b , 10 c , 10 d , and the front plate 12 , which is provided to a tip end of the circumferential wall 11 .
- the bolt head 31 b of the bolt 31 axially protrudes from the front plate 12 , so that the surface of the front plate 12 , i.e., the end face of the shoe housing 10 can serve as the seat face of the bolt head 31 b .
- the shoes 10 a , 10 b , 10 c , 10 d can be downsized, so that the advanced angular range of the vane rotor members 50 , 50 a , 50 b , 50 c , 50 d can be easily enlarged between the corresponding shoes, compared with a structure, in which a seat face of the bolt head 31 b is formed in the circumferential wall 11 .
- the shoe 10 a When a seat face of the bolt head 31 b is formed in the circumferential wall 11 , specifically, in the shoe 10 a , for example, the shoe 10 a needs to be enlarged to form a seat face, which has a sufficient area to axially receive the bolt head 31 b . Accordingly, when a seat face of the bolt head 31 b is formed in the shoe 10 a , the shoe 10 a may be enlarged, and the advanced angular range may be decreased.
- a radially outer wall surface needs to be provided to the circumferential wall to secure a gap between the circumferential wall and the radially outer periphery of the bolt head.
- the radially outer wall surface axially extends from the seat face to secure a predetermined gap from the radially outer periphery of the bolt head. Accordingly, shoes are occupied by the size of the radially outer wall surface. Furthermore, the shoes need to be enlarged by the wall thickness needed for forming the radially outer wall surface.
- the shoes are restricted from being downsized due to the radially outer wall surface for securing the gap between the circumferential wall and the radially outer periphery of the bolt head. Therefore, this conventional structure cannot be downsized compared with the structure in the above embodiment.
- valve timing control device 1 controls the difference of rotational phase of the camshaft 4 , which operates the exhaust valve 201 , with respect to the crankshaft 210 .
- the valve timing control device 1 may control the difference of rotational phase of the camshaft 4 , which operates an intake valve 202 , with respect to the crankshaft 210 .
- the bolt 31 is used as the member that secures the shoe housing 10 with the sprocket portion 30 , which is a member of the driving force transmission system.
- this member is not limited to a screwing member such as a bolt, and the member may be any securing member, as long as the member secures the shoe housing 10 with the sprocket portion 30 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A valve timing control device includes a housing, a vane rotor, a coil spring, a hooking member, and a securing member. The housing rotates with a driving shaft, and defines accommodation chambers that include island portions to be circumferentially adjacent to each other. The vane rotor includes a vane portion, which is restricted in rotation within a predetermined rotative angular range defined by the plurality of island portions in the accommodation chambers. The coil spring has one end, which hooks on the housing, and has the other end, which hooks on the vane rotor to bias the vane rotor to an advanced angular side with respect to the housing. The hooking member circumferentially hooks on the one end. The securing member secures a driving force transmission member to the housing. The hooking member and the securing member are provided to the island portion, and are arranged in this order along a direction, in which resilience of the coil spring works.
Description
- This application is based on and incorporates herein by reference Japanese Patent Application No. 2004-144007 filed on May 13, 2004.
- The present invention relates to a valve timing control device, and is preferably applied to a valve timing control device that changes opening and closing timing of at least one of an intake valve and an exhaust valve of a vehicular internal combustion engine in accordance with an operating condition, for example.
- A vane-type valve timing control device disclosed in JP-A-2001-82278 hydraulically controls a valve timing of at least one of an intake valve and an exhaust valve in accordance with a phase difference caused by a relative rotation between a chain sprocket and a camshaft. The vane-type valve timing control device drives the camshaft serving as a driven shaft via a driving force transmission member such as a timing pulley, which synchronously rotates with a crankshaft serving as a driving shaft, and the chain sprocket. In the vane-type valve timing control device, an initial phase thereof in such an idling condition has to be on the advanced angular side opposite to load torque, which urges the vane rotor to the retarded angular side when the camshaft is driven.
- The valve timing control device disclosed in JP-A-2001-82278 includes a housing, a vane rotor, and an assist spring. The housing rotates with the driving force transmission member such as the chain sprocket. The vane rotor rotates with the camshaft, and the vane rotor is capable of rotating within an accommodation chamber formed in the housing. The assist spring applies force against the vane rotor in the advanced direction. The assist spring is constructed of a torsion coil spring. Both ends of the torsion coil spring are arranged along the axial direction. One end of both the ends of the torsion coil spring is secured to the vane rotor. The other end of the torsion coil spring is secured to the housing that accommodates the vane rotor such that the vane rotor is rotatable in both the advanced direction and the retarded direction.
- However, in the above structure disclosed in JP-A-2001-82278, the other end of the torsion coil spring, which axially extends, is secured to a spring securing portion on the side of the housing, and the spring securing portion overhangs to the frontside of the engine. Accordingly, the length of the valve timing control device, that is, the length of the engine may be enlarged.
- On the contrary, the other end of the torsion coil spring may be radially extended outwardly from the outer circumferential periphery of the torsion coil spring. The housing includes island portions that are circumferentially arranged in the accommodation chamber formed in the housing to receive the vane rotor. A hooking member such as a pin is secured to the island portion by pressure insertion or the like, so that the other end of the torsion coil spring is capable of hooking to the pin.
- Each of the island portions, which are circumferentially arranged in the accommodation chamber that receives the vane rotor, is preferably reduced in width relative to the rotative direction thereof to enlarge a range of advanced angle of the vane rotor. Here, a bolt shank of a bolt is capable of being inserted through a hole, which is formed in the island portion. The bolt serves as a securing member to secure the driving force transmission member such as the chain sprocket to the housing. When the torsion coil spring, in which the other end radially outwardly extends, is applied to the valve timing control device, the bolt, specifically a bolt head and the pin may be hard to be arranged within the island portion, which is preferably formed small in width relative to the rotative direction.
- In view of the foregoing problems, it is an object of the present invention to produce a valve timing control device that includes a vane rotor, a housing, a torsion coil spring urging the vane rotor in the advanced direction or in the retarded direction relative to the housing, in a manner that a range of an advanced angle between island portions, which are circumferentially arranged within the accommodation chamber receiving the vane rotor, can be enlarged. The valve timing control device includes a hooking member, to which an end of the torsion coil spring hooks, and a securing member such as a screwing member, in a manner that the hooking member and the securing member can be arranged in the island portion.
- It is another object of the present invention to produce a valve timing control device that includes the vane rotor, the housing, the torsion coil spring urging the vane rotor in the advanced direction or in the retarded direction relative to the housing, in a manner that the range of the advanced angle between the island portions of the vane rotor can be enlarged, besides the hooking member, to which the end of the torsion coil spring hooks, and the securing member can be arranged in the island portion, furthermore, the valve timing control device is capable of being downsized in the axial direction.
- According to the present invention, a valve timing control device is provided to a driving force transmission system, which transmits driving force from a driving shaft of an internal combustion engine to a driven shaft. The driven shaft opens and closes at least one of an intake valve and an exhaust valve. The valve timing control device controls an opening timing and a closing timing of at least one of the intake valve and the exhaust valve. The valve timing control device includes a housing member, a vane rotor member, a torsion coil spring, a hooking member, and a securing member.
- The housing member rotates with one of the driving shaft and the driven shaft. The housing member defines multiple accommodation chambers that include multiple island portions to be adjacent to each other in a circumferential direction of the accommodation chambers. The vane rotor member is accommodated in the accommodation chambers. The vane rotor member includes a vane portion, which is restricted in rotation within a predetermined rotative angular range defined by the plurality of island portions.
- The torsion coil spring has one end that hooks on the housing member. The torsion coil spring has another end that hooks to the vane rotor member. The torsion coil spring biases the vane rotor member to one of an advanced angular side and a retarded angular side with respect to the housing member. The hooking member circumferentially hooks on the one end of the torsion coil spring. The one end of the torsion coil spring extends to a radially outer side. The securing member secures a member of the driving force transmission system to the housing member.
- The hooking member and the securing member are provided to at least one of the island portions. The hooking member and the securing member are arranged in this order along a direction, in which resilience of the torsion coil spring works.
- Thereby, the width of the island portion in a rotative angular direction can be decreased. Thus, the advanced angular range, in which the vane portion is rotatable between corresponding island portions in the circumferential direction, can be further increased.
- The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:
-
FIG. 1 is a schematic view showing a valve timing control device according to an embodiment of the present invention; -
FIG. 2 is a partially perspective front view showing the valve timing control device according to the embodiment; -
FIG. 3 is a front view showing the valve timing control device taken along the line III-III inFIG. 1 ; -
FIG. 4A is a segmentary view showing a condition, in which a torsion coil spring hooks to a pin in the valve timing control device, andFIG. 4B is a side view showing the condition, in which the torsion coil spring hooks to the pin according to the embodiment; -
FIG. 5A is a segmentary view showing a condition, in which a torsion coil spring hooks to a pin in a valve timing control device, andFIG. 5B is a side view showing the condition, in which the torsion coil spring hooks to the pin, according to a first comparative example; and -
FIG. 6A is a segmentary view showing a condition, in which a torsion coil spring hooks to a pin in a valve timing control device, andFIG. 6B is a side view showing the condition, in which the torsion coil spring hooks to the pin, according to a second comparative example. - (Embodiment)
- As shown in
FIG. 1 , a valve timing control device 1 includes ashoe housing 10 and asprocket portion 30. Theshoe housing 10 serves as a housing member. Thesprocket portion 30 is constructed of a bush portion (bush) 32 and asprocket 33. Thebush 32 receives acamshaft 4, which serves as a driven shaft, therethrough. Thesprocket 33 hasgears 33 b on the outer circumferential periphery thereof. Driving force is transmitted from acrankshaft 210 to thesprocket 33 via a drivingforce transmission member 211 such as atiming chain 211 or atiming belt 211, so that thesprocket 33 rotates synchronously with thecrankshaft 210. In this embodiment, atiming chain 211 is used as the driving force transmission member. Thecrankshaft 210 serves as a driving shaft of aninternal combustion engine 300. - Driving force is transmitted from the
sprocket portion 30, specifically, from thesprocket 33 to thecamshaft 4, so that thecamshaft 4 opens and closes anexhaust valve 201. Thecamshaft 4 is capable of rotating at a predetermined phase difference with respect to thesprocket portion 30. Thetiming chain 211 and thesprocket portion 30 construct the driving force transmission member for a driving force transmission system. The driving force transmission member transmits driving force of thecrankshaft 210 to thecamshaft 4. Thesprocket 33 and thebush 32 are secured using abolt 34 to integrally construct thesprocket portion 30. Thesprocket portion 30 and thecamshaft 4 rotate in the clockwise direction (advanced direction) when being viewed from the left direction inFIG. 1 . Theshoe housing 10 and thesprocket portion 30 construct a rotative body, which rotates synchronously with thecrankshaft 210, on the driving side. Theshoe housing 10 and thesprocket portion 30 are coaxially secured to each other using abolt 31. - The
shoe housing 10 is constructed of a substantially cylindrical circumferential wall (shoe housing portion) 11 and a substantially flat plate shaped front plate (front plate portion) 12. Thecircumferential wall 11 and thefront plate 12 are secured to thesprocket portion 30 using thebolt 31 to be integral in a substantially bowl shape. Thecircumferential wall 11 and thefront plate 12 are not limited to be individual members, and may be an integral member. - As shown in
FIGS. 2, 3 , theshoe housing 10, specifically, thecircumferential wall 11 includes island portions (shoes) 10 a, 10 b, 10 c, 10 d that are formed in a substantially trapezoid shape relative to the axial direction of theshoe housing 10. Theshoes circumferential wall 11 at substantially regular intervals. In this embodiment, thecircumferential wall 11 is formed withshoes shoe 10 a, into which a pin (hooking member) 22 is press-inserted, theshoe 10 b, theshoe 10 c, and theshoe 10 d along the clockwise direction. - The
shoes FIG. 3 , the four spaces among theshoes form accommodation chambers 14. Eachaccommodation chamber 14 accommodates each of vane portions (vanes) 50 a, 50 b, 50 c, 50 d serving as vane rotor members. Eachshoe shoe accommodation chamber 14. - The
vanes rotor 50. Eachvane accommodation chamber 14, such that eachvane accommodation chamber 14 into a retarded angular hydraulic chamber and an advanced angular hydraulic chamber. Therotor 50 and thevanes vane accommodation chamber 14, i.e., between shoes, while being restricted in rotative angle within a predetermined rotative angular range (advanced angular range) Δθ. - As referred to
FIG. 1 , apositioning pin 51 is provided between therotor 50 and thecamshaft 4 for positioning the valve timing control device 1 with respect to thecamshaft 4. Therotor 50 is positioned to be in a positioning angle using thepositioning pin 51, subsequently, therotor 50 is secured integrally with thecamshaft 4 using abolt 20. Therotor 50, thevanes positioning pin 51 construct a rotative body, which rotates synchronously with thecamshaft 4 on the driven side. Thecamshaft 4, therotor 50, thevanes shoe housing 10 and thesprocket portion 30. - As referred to
FIG. 3 , each of shoe seals 53 engages with each outer periphery of eachvane vane circumferential wall 11 forms a small clearance therebetween. Theshoe seal 53 restricts working fluid from leaking between the retarded angular hydraulic chamber and the advanced angular hydraulic chamber thorough the clearance. Theshoe seal 53 is urged onto the inner circumferential wall of thecircumferential wall 11 by resilience of a leaf spring (not shown). Each of shoe seals 53 is also respectively provided into each clearance formed between the outer circumferential periphery of therotor 50 and each inner wall of theshoes circumferential wall 11. - As referred to
FIGS. 1, 3 , astopper piston 71, which is in a substantially cylindrical shape, is accommodated in thevane 50 d to be slidable along the axial direction of thecamshaft 4. An engagingring 72 is press-inserted into a recess formed in thesprocket portion 30, specifically formed in thebush 32. Thestopper piston 71 is capable of engaging with the engagingring 72. Aspring 73 urges thestopper piston 71 to the side of the engagingring 72. Thestopper piston 71 has a tip end that is capable of engaging with the engagingring 72, when thevane rotor 50 is at the most advanced angular position with respect to theshoe housing 10. Thevane rotor 50 is restricted from rotating with respect to theshoe housing 10, when thestopper piston 71 engages with the engagingring 72. When thevane rotor 50 rotates from the most advanced angular position to the retarded angular side with respect to theshoe housing 10, thestopper piston 71 is circumferentially displaced relative to the engagingring 72, so that thestopper piston 71 does not engage with the engagingring 72. Here, thestopper piston 71 may be accommodated in a guide ring, which is press-inserted into thevane 50 d (FIG. 3 ), such that thestopper piston 71 is slidable along the axial direction of thecamshaft 4. Thestopper piston 71 and the engagingring 72 construct a rotative angular phase latching means 70. The rotative angular phase latching means 70 is capable of latching theshoe housing 10 onto thevane rotor 50 at an intermediate position in the predetermined rotative angular range. That is, the rotative angular phase latching means 70 is capable of latching the rotative body, which is on the driving side, onto the rotative body, which is on the driven side, at the intermediate position in the predetermined rotative angular range. In this embodiment, the intermediate position is the most advanced angular position in the predetermined rotative angular range. - The
shoe 10 a and thevane 50 a form an advanced angular hydraulic chamber therebetween. Theshoe 10 b and thevane 50 b form an advanced angular hydraulic chamber therebetween. Theshoe 10 c and thevane 50 c form an advanced angular hydraulic chamber therebetween. Theshoe 10 d and thevane 50 d form an advanced angular hydraulic chamber therebetween. - The
shoe 10 b and thevane 50 a form a retarded angular hydraulic chamber therebetween. Theshoe 10 c and thevane 50 b form a retarded angular hydraulic chamber therebetween. Theshoe 10 d and thevane 50 c form a retarded angular hydraulic chamber therebetween. Theshoe 10 a and thevane 50 d form a retarded angular hydraulic chamber therebetween. - As referred to
FIG. 1 ,hydraulic paths valve 100 viahydraulic paths hydraulic supply path 101 is connected to ahydraulic pump 102, so that oil is supplied from thehydraulic pump 102 through thehydraulic supply path 101. Ahydraulic exhaust path 103 opens to adrain 104, so that oil is exhausted toe thedrain 104 through thehydraulic exhaust path 103. Thehydraulic pump 102 pumps working fluid from thedrain 104, so that thehydraulic pump 102 supplies the working fluid to respective hydraulic chambers through the switchingvalve 100. The switchingvalve 100 is a guide valve with 4 ports. The switchingvalve 100 has avalve member 105 that is urged by aspring 106 to one side. Thevalve member 105 reciprocates by energizing and de-energizing asolenoid 107. Thesolenoid 107 is controlled in emerging condition by an ECU serving as a control means (not shown). Thevalve member 105 reciprocates in the switchingvalve 100, so that a combination of communication and a combination of blockade can be switched among thehydraulic paths hydraulic supply path 101, and thehydraulic exhaust path 103. With the above structure of hydraulic paths, working fluid can be supplied from thehydraulic pump 102 to the advanced angular hydraulic chamber, the retarded angular hydraulic chamber, and a hydraulic chamber 121 (FIG. 1 ), besides, hydraulic fluid can be exhausted from respective hydraulic chambers to thedrain 104. - A spring (torsion coil spring) 21 is accommodated in a substantially annular accommodating portion formed in a
spring plate 29. As referred toFIGS. 1, 2 , thespring 21 has oneend 21 a that hooks to thepin 22, which protrudes from thefront plate 12. As referred toFIGS. 2, 3 , thespring 21 has theother end 21 b that hooks to a securinggroove 54 a, which is formed in abolt seat face 54. Thecamshaft 4 receives load torque when thecamshaft 4 drives theexhaust valve 201. The load torque applied to thecamshaft 4 fluctuates to both the positive side and the negative side thereof. The load torque applied to the positive side biases therotor 50 to the retarded angular side with respect to theshoe housing 10. The load torque applied to the negative side biases therotor 50 to the advanced angular side with respect to theshoe housing 10. Load torque works to the positive side, i.e., to the retarded angular side, on average. Resiliency of thespring 21 works as torque that rotates therotor 50 to the advanced angular side with respect to theshoe housing 10. Thespring 21 applies torque to therotor 50 in the advanced angular direction, and the torque applied by thespring 21 to therotor 50 becomes maximum when therotor 50 is in the most retarded angular position with respect to theshoe housing 10. As therotor 50 moves to the advanced angular direction with respect to theshoe housing 10, the torque, which is applied to therotor 50 by thespring 21, decreases. Thespring 21 serves as an advanced angular assisting means that urges therotor 50 to the advanced angular side, i.e., the rotative angular direction. - The
pin 22 is secured to the front plate 12 (FIG. 2 ) and thecircumferential wall 11, specifically, theshoe 10 a by press-insertion or the like. Eachshoe bolt hole 11 t, through which thebolt 31 is capable of being inserted. Theshoe 10 a has apin hole 11 p, through which thepin 22 is press-inserted, in addition to thebolt hole 11 t. - Each circumferential wall of each
shoe shoe FIG. 2 . The circumferential wall of theshoe 10 a also restricts the vane in rotative angle. The circumferential wall of theshoe 10 a has a width that is shown by a rotative angle range A1. Thepin hole 11 p is formed in theshoe 10 a in addition to thebolt hole 11 t, accordingly, A1 becomes greater than A2. - The
bolt 31 includes abolt shank 31 a and abolt head 31 b. Thebolt shank 31 a has a thread on the tip end thereof. Thebolt head 31 b transmits screw torque, which is applied from the outside, to thebolt shank 31 a. The end face of theshoe housing 10, specifically, the surface of thefront plate 12 forms a seat face of thebolt head 31 b. Thepin 22 includes a pin shank (shank portion) 22 a and a pin head (disc portion) 22 b. Thepin shank 22 a is press-inserted into theshoe 10 a, specifically, into thepin hole 11 p, so that thepin 22 is secured to theshoe 10 a. Thepin head 22 b, which is in a disc shape, is formed to be larger than thepin shank 22 a in diameter. Thereby, thepin head 22 b restricts the oneend 21 a of thespring 21 from being detached from thepin shank 22 a of thepin 22 along the axial direction of thepin 22 due to spring back of thespring 21 or the like. - The
bolt 31 serves as a securing member (screwing member) that secures theshoe housing 10, specifically, thecircumferential wall 11 and thefront plate 12 to thesprocket portion 30. Thepin 22 serves as a hooking means such that the oneend 21 a, which radially extends from thespring 21, hooks to thepin 22 in the circumferential direction. - As show in
FIGS. 4A, 4B , thepin 22 and thebolt 31 are arranged in theshoe 10 a. Thepin 22 and thebolt 31 are arranged in this order along the direction, in which resilience (spring force) of thespring 21 works. Here, thespring 21 resiliently urges therotor 50 to the advanced angular side in the rotative angular direction. - Preferably, the
pin 22 and thebolt 31 are arranged in theshoe 10 a such that the radially outer periphery of thepin shank 22 a of thepin 22 contacts with the radially outer periphery of thebolt head 31 b of thebolt 31. Thereby, the width, i.e., the angle A1 of theshoe 10 a in the rotative direction can be reduced. Thus, theshoe 10 a can be downsized in the rotative direction. Thereby, an advanced angular range of thevanes shoes rotor 50 and thevanes shoes shoes - Furthermore, preferably, the
pin head 22 b contacts with thebolt head 31 b in the axial direction. Thereby, a height of a member, which protrudes from the seat face of thefront plate 12, is limited to a height, which is a sum of the height of thebolt head 31 b and the height of thepin head 22 b. Therefore, the height of the member, which protrudes from the end face of theshoe housing 10, specifically, the height of the member, which protrudes from the surface of thefront plate 12 in a substantially axial direction, can be reduced to a small degree. Thus, the valve timing control device 1 can be downsized relative to the axial direction. - As follows, a first comparative example and a second comparative example are described in reference to
FIGS. 5A, 5B , 6A, 6B. - In the first comparative example shown in
FIG. 5A , thepin 22 and thebolt 31 are provided to theshoe 10 a. Specifically, thebolt 31 and thepin 22 are arranged in this order along the direction, in which resilience (spring force) of thespring 21 works. As shown inFIGS. 5A, 5B , thepin 22 and thebolt 31 are arranged in theshoe 10 a such that the radially outer periphery of thepin shank 22 a contacts with the radially outer periphery of thebolt head 31 b. Thereby, the width A1 of theshoe 10 a in the rotative direction can be reduced. - However, the
pin shank 22 a needs to be extended from thebolt head 31 b by the diameter φC of thespring 21 in the axial direction thereof to contact the oneend 21 a of thespring 21 circumferentially with thepin shank 22 a. Here, the oneend 21 a of thespring 21 does not circumferentially contact with thebolt head 31 b. In this first comparative example, the axial gap between thebolt head 31 b and thepin head 22 b is set to be B (B>φC), for example. In this case, the height of thepin shank 22 a is extended by the height B, compared with the structure in the embodiment described above. - In the first comparative example, the
pin shank 22 a needs to be extended by at least the diameter φC of thespring 21, compared with the embodiment described above. Accordingly, a length, by which a member protrudes from the end face of theshoe housing 10 substantially along the axial direction, may increase. - On the contrary, as shown in
FIG. 6A , in the second comparative example, thepin 22 and thebolt 31 are provided to theshoe 10 a. Specifically, thebolt 31 and thepin 22 are arranged in this order along the direction, in which resilience (spring force) of thespring 21 works, similarly to the first example. As shown inFIGS. 6A, 6B , thepin 22 and thebolt 31 are arranged in theshoe 10 a such that the radially outer periphery of thepin shank 22 a does not contact with the radially outer periphery of thebolt head 31 b. That is, the radially outer periphery of thepin shank 22 a is apart from the radially outer periphery of thebolt head 31 b by a predetermined distance. Thereby, a length, by which thepin 22, specifically, thepin head 22 b protrudes from the end face of theshoe housing 10 substantially along the axial direction, can be reduced to small degree. - However, in the second comparative example, the
spring 21 needs to be hooked to thepin shank 22 a of thepin 22, which is assembled to theshoe 10 a, through a gap D between thepin head 22 b and thebolt head 31 b. Accordingly, a shortest gap between thepin 22 and thebolt 31 along the circumferential direction needs to be larger than the diameter φC of thespring 21. That is, a gap D, which is formed between the radially outer periphery of thepin head 22 b and the radially outer periphery of thebolt head 31 b, needs to be larger than the diameter φC of thespring 21. - In the second comparative example, when the gap D is set to be greater than the diameter φC of the
spring 21, for example, the width A3 (A3>A1) of theshoe 10 a increases by the gap D in the rotative direction, compared with the embodiment described above. - As follows, an operation of the valve timing control device having the above structure is described. As shown in
FIG. 1 , when theengine 300 is normally operated, working fluid is supplied to thehydraulic chamber 121, which is arranged on the outer circumferential side of thestopper piston 71. Thereby, hydraulic pressure works onto thestopper piston 71, so that thestopper piston 71 is pulled out of the engagingring 72. In this situation, thevanes rotor 50 are rotatable relative to theshoe housing 10 and thesprocket portion 30. Hydraulic pressure applied to each hydraulic chamber is controlled, so that a phase difference of thecamshaft 4 is controlled with respect to thecrankshaft 210. - Even when the
engine 300 is restarted, working fluid is not supplied to thehydraulic chamber 121, which is arranged on the outer circumferential side of thestopper piston 71, before working fluid is supplied to the advanced angular hydraulic chamber and the retarded angular hydraulic chamber. Therefore, thestopper piston 71 is maintained to be engaging with the engagingring 72, so that thecamshaft 4 is maintained at the most advanced angular position with respect to thecrankshaft 210. - Working fluid is supplied to the advanced angular hydraulic chamber or the retarded angular hydraulic chamber, and working fluid is supplied to the
hydraulic chamber 121, so that thestopper piston 71 receives force in the left direction inFIG. 1 . Thereby, thestopper piston 71 is pulled out of the engagingring 72 against resilience of thespring 73. As a result, restriction between therotor 50 and the shoe housing is released, so that thevane rotor 50 rotates relative to theshoe housing 10 by hydraulic force working in the advanced angular hydraulic chamber and the retarded angular hydraulic chamber. Thus, a phase difference of thecamshaft 4 can be adjusted relative to thecrankshaft 210. - Next, an effect of the structure of the above embodiment is described.
- The valve timing control device 1 includes a
shoe housing 10, thevane rotor member spring 21. - The
vanes shoes 10 such as theshoes shoes shoe housing 10, specifically, formed in thecircumferential wall 11. - The one
end 21 a of thespring 21 hooks on theshoe housing 10. Theother end 21 b of thespring 21 hooks on thevane rotor member spring 21 biases thevane rotor member shoe housing 10. - The valve timing control device 1 further includes the
pin 22 and thebolt 31. The oneend 21 a of thespring 21 extends to the radially outer side. The oneend 21 a of thespring 21 hooks on thepin 22 in the circumferential direction. Thebolt 31 secures thesprocket portion 30 with theshoe housing 10. Thepin 22 and thebolt 31 are arranged within theshoe 10 a in this order along the direction, in which resilience of thespring 21 is applied. Thereby, the advanced angular range of thevane rotor member pin 22 and thebolt 31 can be arranged in theshoe 10 a. Specifically, eachvane shoes pin 22 and thebolt 31 can be provided to theshoe 10 a. - In the structure of the above embodiment, the
pin 22 and thebolt 31 are preferably arranged in theshoe 10 a in such a manner that the radially outer periphery of thepin shank 22 a and the radially outer periphery of thebolt head 31 b contact with each other. Thereby, the width Al of theshoe 10 a in the rotative angular direction can be decreased. Thus, the advanced angular range, in which each vane 50 a, 50 b, 50 c, 50 d is rotatable between two of the correspondingshoes - The arrangement of the
pin 22 and thebolt 31 in theshoe 10 a is not limited to the arrangement, in which the radially outer peripheries of thepin shank 22 a and thebolt head 31 b contact with each other for increasing the advanced angular range, in which each vane 50 a, 50 b, 50 c, 50 d are rotatable between two of the correspondingshoes - Any radially outer periphery of the
pin 22 may contact with the radially outer periphery of thebolt head 31 b. For example, the radially outer periphery of thepin head 22 b may contact with the radially outer periphery of thebolt head 31 b. Even in this structure, thepin 22 and thebolt 31 are arranged within theshoe 10 a in such an order from thepin 22 to thebolt 31 along resilient force of thespring 21. Therefore, the advanced angular range, in which each vane 50 a, 50 b, 50 c, 50 d is rotatable between two of the correspondingshoes pin 22 and thebolt 31 can be provided to theshoe 10 a. - Furthermore, in the above embodiment, preferably, the
pin head 22 b axially contacts with thebolt head 31 b. Thereby, the height of the member, which protrudes from the end face of thefront plate 12, specifically, from the seat face of thefront plate 12, is limited to the height, which is the sum of the height of thebolt head 31 b and the height of thepin head 22 b. Therefore, the height of the member, which protrudes from the end face of theshoe housing 10 can be reduced. Thus, the valve timing control device 1 can be downsized relative to the axial direction. - Furthermore, in the above embodiment, preferably, the
shoe housing 10 includes thecircumferential wall 11, which includes theshoes front plate 12, which is provided to a tip end of thecircumferential wall 11. Besides, thebolt head 31 b of thebolt 31 axially protrudes from thefront plate 12, so that the surface of thefront plate 12, i.e., the end face of theshoe housing 10 can serve as the seat face of thebolt head 31 b. Thereby, theshoes vane rotor members bolt head 31 b is formed in thecircumferential wall 11. - When a seat face of the
bolt head 31 b is formed in thecircumferential wall 11, specifically, in theshoe 10 a, for example, theshoe 10 a needs to be enlarged to form a seat face, which has a sufficient area to axially receive thebolt head 31 b. Accordingly, when a seat face of thebolt head 31 b is formed in theshoe 10 a, theshoe 10 a may be enlarged, and the advanced angular range may be decreased. - According to a conventional structure disclosed in JP-A-2002-295210, when a seat face of a bolt head is formed in a circumferential wall, a radially outer wall surface needs to be provided to the circumferential wall to secure a gap between the circumferential wall and the radially outer periphery of the bolt head. The radially outer wall surface axially extends from the seat face to secure a predetermined gap from the radially outer periphery of the bolt head. Accordingly, shoes are occupied by the size of the radially outer wall surface. Furthermore, the shoes need to be enlarged by the wall thickness needed for forming the radially outer wall surface. Accordingly, the shoes are restricted from being downsized due to the radially outer wall surface for securing the gap between the circumferential wall and the radially outer periphery of the bolt head. Therefore, this conventional structure cannot be downsized compared with the structure in the above embodiment.
- (Other Embodiment)
- In the above embodiment, the valve timing control device 1 controls the difference of rotational phase of the
camshaft 4, which operates theexhaust valve 201, with respect to thecrankshaft 210. However, the valve timing control device 1 may control the difference of rotational phase of thecamshaft 4, which operates anintake valve 202, with respect to thecrankshaft 210. - In the above embodiment, the
bolt 31 is used as the member that secures theshoe housing 10 with thesprocket portion 30, which is a member of the driving force transmission system. However, this member is not limited to a screwing member such as a bolt, and the member may be any securing member, as long as the member secures theshoe housing 10 with thesprocket portion 30. - The structures of the above embodiments and the examples can be combined as appropriate.
- Various modifications and alternations may be diversely made to the above embodiments without departing from the spirit of the present invention.
Claims (7)
1. A valve timing control device that is provided to a driving force transmission system, which transmits driving force from a driving shaft of an internal combustion engine to a driven shaft, the driven shaft opening and closing at least one of an intake valve and an exhaust valve, the valve timing control device controlling an opening timing and a closing timing of at least one of the intake valve and the exhaust valve, the valve timing control device comprising:
a housing member that rotates with one of the driving shaft and the driven shaft, the housing member defining a plurality of accommodation chambers that includes a plurality of island portions to be adjacent to each other in a circumferential direction of the plurality of accommodation chambers;
a vane rotor member that is accommodated in the plurality of accommodation chambers, the vane rotor member including a vane portion, which is restricted in rotation within a predetermined rotative angular range defined by the plurality of island portions;
a torsion coil spring that has one end that hooks to the housing member, the torsion coil spring having an other end that hooks to the vane rotor member, the torsion coil spring biases the vane rotor member to one of an advanced angular side and a retarded angular side with respect to the housing member;
a hooking member that circumferentially hooks on the one end of the torsion coil spring, the one end of the torsion coil spring extending to a radially outer side; and
a securing member that secures a member of the driving force transmission system to the housing member,
wherein the hooking member and the securing member are provided to at least one of the plurality of island portions, and
the hooking member and the securing member are arranged in this order along a direction, in which resilience of the torsion coil spring works.
2. The valve timing control device according to claim 1 ,
wherein the securing member is a bolt that has a bolt head, and
the bolt head contacts with the hooking member.
3. The valve timing control device according to claim 2 ,
wherein the hooking member includes a shank portion and a disc portion,
the shank portion of the hooking member is inserted into the at least one of the plurality of island portions,
the disc portion is provided to a tip end of the shank portion of the hooking member,
the disc portion has a diameter that is larger than a diameter of the shank portion of the hooking member, and
the shank portion of the hooking member contacts with a radially outer periphery of the bolt head.
4. The valve timing control device according to claim 3 , wherein the disc portion of the hooking member contacts with the bolt head in an axial direction.
5. The valve timing control device according to claim 1 ,
wherein the housing member is formed in a substantially cylindrical shape,
the housing member includes a shoe housing portion and a front plate portion,
the shoe housing portion includes the plurality of island portions,
the front plate portion is arranged at a tip end of the shoe housing portion,
the securing member is capable of being inserted into the shoe housing portion and the front plate portion, and
the securing member protrudes from the front plate portion in an axial direction.
6. The valve timing control device according to claim 1 , wherein the one end of the torsion coil spring, the hooking member, and the securing member are arranged in this order along the direction, in which resilience of the torsion coil spring works.
7. The valve timing control device according to claim 1 ,
wherein the member of the driving force transmission system includes a sprocket portion that is constructed of a bush portion and a sprocket, and
the bush portion rotatably receives the driven shaft.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004144007A JP2005325758A (en) | 2004-05-13 | 2004-05-13 | Valve timing adjusting device |
JP2004-144007 | 2004-05-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050252468A1 true US20050252468A1 (en) | 2005-11-17 |
Family
ID=35308221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/125,079 Abandoned US20050252468A1 (en) | 2004-05-13 | 2005-05-10 | Valve timing control device having vane rotor |
Country Status (2)
Country | Link |
---|---|
US (1) | US20050252468A1 (en) |
JP (1) | JP2005325758A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060231053A1 (en) * | 2005-04-19 | 2006-10-19 | Denso Corporation | Driving force transmitter and valve timing controller using the same |
WO2007082600A1 (en) * | 2006-01-21 | 2007-07-26 | Schaeffler Kg | Camshaft adjuster for an internal combustion engine |
US20070215085A1 (en) * | 2006-03-15 | 2007-09-20 | Denso Corporation | Valve timing control apparatus |
EP2017437A1 (en) * | 2007-07-19 | 2009-01-21 | Denso Corporation | Valve timing adjuster |
US20090020086A1 (en) * | 2007-07-19 | 2009-01-22 | Denso Corporation | Valve timing adjuster |
US20100258069A1 (en) * | 2009-04-09 | 2010-10-14 | Denso Corporation | Valve timing control apparatus |
WO2012062495A1 (en) * | 2010-11-11 | 2012-05-18 | Schaeffler Technologies AG & Co. KG | Camshaft adjuster for an internal combustion engine |
US20120174884A1 (en) * | 2011-01-12 | 2012-07-12 | Hitachi Automotive Systems, Ltd. | Variable Valve Timing Control Apparatus of Internal Combustion Engine |
US20140069361A1 (en) * | 2012-09-07 | 2014-03-13 | Hitachi Automotive Systems, Ltd. | Valve timing control apparatus for internal combustion engine |
CN103899375A (en) * | 2012-12-25 | 2014-07-02 | 谢夫勒科技股份两合公司 | Cam shaft adjuster with central bolt |
US20150053157A1 (en) * | 2013-08-22 | 2015-02-26 | Schaeffler Technologies Gmbh & Co. Kg | Method and apparatus for winding a return spring with a two piece rotor for a cam phaser |
US20150361837A1 (en) * | 2013-01-18 | 2015-12-17 | Mikuni Corporation | Variable valve timing device and method of assembling same |
US9951660B2 (en) | 2013-09-20 | 2018-04-24 | Hitachi Automotive Systems, Ltd. | Valve timing control device for internal combustion engine, and fastening structure |
US20180283228A1 (en) * | 2017-03-30 | 2018-10-04 | Aisin Seiki Kabushiki Kaisha | Valve Opening and Closing Timing Control Apparatus |
US11933200B2 (en) | 2019-07-09 | 2024-03-19 | Mikuni Corporation | Valve timing change device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006022219B4 (en) | 2006-05-11 | 2008-01-03 | Hydraulik-Ring Gmbh | Leakage-proof camshaft adjuster with return spring |
JP4900296B2 (en) * | 2008-03-24 | 2012-03-21 | トヨタ自動車株式会社 | Variable phase valve mechanism for internal combustion engine |
JP5360111B2 (en) * | 2011-03-29 | 2013-12-04 | 株式会社デンソー | Valve timing adjustment device |
JP6578896B2 (en) * | 2015-11-09 | 2019-09-25 | アイシン精機株式会社 | Valve timing control device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6758178B2 (en) * | 2001-03-30 | 2004-07-06 | Denso Corporation | Valve timing control device |
US7165521B2 (en) * | 2002-12-24 | 2007-01-23 | Aisin Seiki Kabushiki Kaisha | Variable valve timing control device |
-
2004
- 2004-05-13 JP JP2004144007A patent/JP2005325758A/en active Pending
-
2005
- 2005-05-10 US US11/125,079 patent/US20050252468A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6758178B2 (en) * | 2001-03-30 | 2004-07-06 | Denso Corporation | Valve timing control device |
US7165521B2 (en) * | 2002-12-24 | 2007-01-23 | Aisin Seiki Kabushiki Kaisha | Variable valve timing control device |
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060231053A1 (en) * | 2005-04-19 | 2006-10-19 | Denso Corporation | Driving force transmitter and valve timing controller using the same |
KR101304714B1 (en) | 2006-01-21 | 2013-09-06 | 섀플러 테크놀로지스 아게 운트 코. 카게 | Camshaft adjuster for an internal combustion engine |
US20100154732A1 (en) * | 2006-01-21 | 2010-06-24 | Schaeffler Kg | Camshaft adjuster for an internal combustion engine |
WO2007082600A1 (en) * | 2006-01-21 | 2007-07-26 | Schaeffler Kg | Camshaft adjuster for an internal combustion engine |
US20070215085A1 (en) * | 2006-03-15 | 2007-09-20 | Denso Corporation | Valve timing control apparatus |
US7322326B2 (en) | 2006-03-15 | 2008-01-29 | Denso Corporation | Valve timing control apparatus |
US20090020086A1 (en) * | 2007-07-19 | 2009-01-22 | Denso Corporation | Valve timing adjuster |
US7946265B2 (en) | 2007-07-19 | 2011-05-24 | Denso Corporation | Valve timing adjuster |
US20090020085A1 (en) * | 2007-07-19 | 2009-01-22 | Denso Corporation | Valve timing adjuster |
EP2017437A1 (en) * | 2007-07-19 | 2009-01-21 | Denso Corporation | Valve timing adjuster |
US20100258069A1 (en) * | 2009-04-09 | 2010-10-14 | Denso Corporation | Valve timing control apparatus |
US8327813B2 (en) * | 2009-04-09 | 2012-12-11 | Denso Corporation | Valve timing control apparatus |
US8967107B2 (en) | 2010-11-11 | 2015-03-03 | Schaeffler Technologies AG & Co. KG | Camshaft adjuster for an internal combustion engine |
WO2012062495A1 (en) * | 2010-11-11 | 2012-05-18 | Schaeffler Technologies AG & Co. KG | Camshaft adjuster for an internal combustion engine |
US20120174884A1 (en) * | 2011-01-12 | 2012-07-12 | Hitachi Automotive Systems, Ltd. | Variable Valve Timing Control Apparatus of Internal Combustion Engine |
CN102588028A (en) * | 2011-01-12 | 2012-07-18 | 日立汽车系统株式会社 | Variable valve timing control apparatus of internal combustion engine |
US9004025B2 (en) * | 2011-01-12 | 2015-04-14 | Hitachi Automotive Systems, Ltd. | Variable valve timing control apparatus of internal combustion engine |
US9151187B2 (en) * | 2012-09-07 | 2015-10-06 | Hitachi Automotive Systems, Ltd. | Valve timing control apparatus for internal combustion engine |
US20140069361A1 (en) * | 2012-09-07 | 2014-03-13 | Hitachi Automotive Systems, Ltd. | Valve timing control apparatus for internal combustion engine |
WO2014101709A1 (en) * | 2012-12-25 | 2014-07-03 | 谢夫勒科技股份两合公司 | Camshaft regulator having central bolt |
CN103899375A (en) * | 2012-12-25 | 2014-07-02 | 谢夫勒科技股份两合公司 | Cam shaft adjuster with central bolt |
US9938863B2 (en) | 2012-12-25 | 2018-04-10 | Schaeffler Technologies AG & Co. KG | Camshaft phaser having central bolt |
US20150361837A1 (en) * | 2013-01-18 | 2015-12-17 | Mikuni Corporation | Variable valve timing device and method of assembling same |
US9657608B2 (en) * | 2013-01-18 | 2017-05-23 | Mikuni Corporation | Variable valve timing device and method of assembling same |
US20150053157A1 (en) * | 2013-08-22 | 2015-02-26 | Schaeffler Technologies Gmbh & Co. Kg | Method and apparatus for winding a return spring with a two piece rotor for a cam phaser |
US9581055B2 (en) * | 2013-08-22 | 2017-02-28 | Schaeffler Technologies AG & Co. KG | Method and apparatus for winding a return spring with a two piece rotor for a cam phaser |
US9951660B2 (en) | 2013-09-20 | 2018-04-24 | Hitachi Automotive Systems, Ltd. | Valve timing control device for internal combustion engine, and fastening structure |
US20180283228A1 (en) * | 2017-03-30 | 2018-10-04 | Aisin Seiki Kabushiki Kaisha | Valve Opening and Closing Timing Control Apparatus |
US10371017B2 (en) * | 2017-03-30 | 2019-08-06 | Aisin Seiki Kabushiki Kaisha | Valve opening and closing timing control apparatus |
US11933200B2 (en) | 2019-07-09 | 2024-03-19 | Mikuni Corporation | Valve timing change device |
Also Published As
Publication number | Publication date |
---|---|
JP2005325758A (en) | 2005-11-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20050252468A1 (en) | Valve timing control device having vane rotor | |
US6058897A (en) | Valve timing device | |
JP2009185766A (en) | Valve timing adjusting device | |
WO2005061859A1 (en) | Valve opening/closing timing control device | |
JP5184403B2 (en) | Valve timing control device for internal combustion engine | |
JP2002256825A (en) | Valve timing adjusting device | |
US6962133B2 (en) | Variable valve timing control device | |
WO2021106892A1 (en) | Valve timing adjustment device | |
US7066122B2 (en) | Variable valve timing controller | |
JP5179405B2 (en) | Valve timing control device for internal combustion engine | |
US6782854B2 (en) | Valve timing control device | |
US7415952B2 (en) | Valve timing control device | |
JP2005155373A (en) | Valve timing adjusting device | |
US6338322B1 (en) | Valve timing control device | |
US20050016482A1 (en) | Variable valve timing control device | |
US6595173B2 (en) | Variable valve timing controller | |
US20020129781A1 (en) | Valve timing control device | |
US6935291B2 (en) | Variable valve timing controller | |
JP4853676B2 (en) | Valve timing adjustment device | |
JP2011220137A (en) | Valve timing control device of internal combustion engine | |
JP2009180148A (en) | Valve timing adjusting device | |
JP2009209719A (en) | Valve timing adjusting device | |
JP4138414B2 (en) | Valve timing control device for internal combustion engine | |
US11255227B2 (en) | Valve opening and closing timing control device | |
US20050022763A1 (en) | Variable valve timing control device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DENSO CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TANAKA, TAKEHIRO;MORII, YASUSHI;REEL/FRAME:016552/0343 Effective date: 20050425 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |