JPH09317411A - Valve opening closing timing control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform reliable switching of a phase fixing state and release of fixing of a rotary shaft for opening closing a valve and a rotation transmission member. SOLUTION: A valve opening closing timing control device is formed such that a rotation transmission member 30 is mounted to form a plurality of peripheral oil pressure chambers 31 partitioned by vanes 29, serving as a partition wall, between a cam shaft 13 and the rotation transmission member is mounted on the cam shaft 13 to transmit a rotation power from a clamp pulley, and an oil pressure is fed to the peripheral oil pressure chambers 31 to rotationally displace between the cam shaft 13 and the rotation transmission member. A runner 52 is provided to guide working oil having an oil pressure exerted on a key groove 51 through a refuge groove to at least one of the oil pressure chambers 31 in a peripheral direction when a knock pin 53 having a tip part pushed out from a refuge groove 54, formed in at least one member of a cam shaft 13 and the rotation transmission member, through an energizing force and fitted in a key groove 51 formed in the other member is moved to take refuge to the refuge groove 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane type valve opening / closing timing control device mounted on a camshaft of a piston type internal combustion engine, and more particularly to a lock mechanism for stabilizing valve timing against cam fluctuation torque and the like. Regarding what you have.

[0002]

2. Description of the Related Art As a valve opening / closing timing control device provided with a lock mechanism (phase lock releasing means) for stabilizing valve timing against cam fluctuation torque, there is Japanese Patent Laid-Open No. 1-92504. As shown in FIG. 6, the valve opening / closing timing control device of the publication discloses a rotation transmitting member 3 on a rotating shaft 1 via an intermediate member 2.
And a rotary hydraulic mechanism in which a plurality of circumferential hydraulic chambers 5 each having a vane 4 as a partition wall are formed between the rotary shaft 1 and the rotation transmitting member 3. Here, the rotating shaft 1 is a cam shaft (a shaft member extending from the cylinder block to the timing pulley side), and the rotation transmitting member 3 is integrated with the timing pulley. The two hydraulic chambers divided by the vane 4 serve as a phase advancing chamber 5a for forcibly rotating the rotation transmitting member 3 to advance the valve timing and a phase retarding chamber 5b for delaying the valve timing.

The rotary shaft 1 has trunks 6 and 7 for supplying hydraulic pressure in the axial direction, and branches 6 branching from the trunks 6 and 7, respectively.
a, 7a, the circumferential passage 6b communicating with the branch 6a, the branch 7
a circumferential passage 7b communicating with a is formed, and the circumferential passage 6b is formed.
Can communicate with each phase advancing chamber 5a through a passage 2a formed in the intermediate member 2, and the circumferential passage 7b can reach each retarding chamber 5b through a passage 2b formed in the intermediate member 2. It is said that communication is possible. A hydraulic pressure from a hydraulic pressure supply device (not shown) is selectively supplied to the trunk lines 6 and 7.

The rotation transmitting member 3 is provided with a knock pin 10 protruding toward the intermediate member by a spring 9 housed in the retracting hole 8, and the intermediate member 2 is provided with a key groove 11 for receiving the tip of the knock pin 10. Are formed. The phase lock releasing means mainly composed of the knock pin 10 is provided at two places here so as to lock the phase at the latest phase and the most advanced phase, and is provided in the key groove 11 of the knock pin 10 for phase locking at the latest phase. Is supplied with hydraulic pressure through a passage 2b 'communicating with the circumferential passage 7b, and the hydraulic pressure is supplied to a key groove 11 of a knock pin 10 which is phase-locked during the most advanced phase via a passage 2a' communicating with the circumferential passage 6b. Is supplied.

In the valve opening / closing timing control device having the above construction, when the knock pin 10 which is constantly urged toward the rotary shaft by the spring 9 and the key groove 11 on the intermediate member side coincide with each other, the knock pin 10 is fitted into the key groove 11. Then, the phases of the rotary shaft 1 and the rotation transmitting member 3 are fixed to stabilize the cam fluctuating torque and the valve timing when the engine starts at low hydraulic pressure.
When the latest phase is released, the knock pin 10 is retracted when the hydraulic pressure is supplied through the trunk path 6, the branch path 6a, the circumferential path 6b, and the path 2a 'to advance the phase. Hole 8
It is done by being immersed in. Similarly, in the case of the most advanced phase, it is performed when the hydraulic pressure is supplied through the main passage 7, the branch passage 7a, the circumferential passage 7b, and the passage 2b 'due to the late phase.

[0006]

In the conventional valve opening / closing timing control device, the hydraulic passage 2 to the phase lock releasing means is used.
a ', 2b' and hydraulic passages 2a, 2 to the circumferential hydraulic chambers
b is independent, the hydraulic pressure is supplied to the phase lock releasing means and the hydraulic pressure is supplied to each circumferential hydraulic chamber, and the rotary shaft 1 and the rotation transmitting member 3 are provided before the knock pin 10 is completely pulled out from the key groove. There is a possibility that the force that starts relative rotation with will work, and the hydraulic efficiency will be poor.

Further, in addition to the passages 2a and 2b for supplying the hydraulic pressure to the circumferential hydraulic chambers, hydraulic passages 2a 'and 2b' for retracting the knock pin 10 are required, and the machining of the intermediate member 2 is complicated and the cost is high. Become. This is a configuration in which the phase lock releasing means is only one of the most advanced phase position and the most retarded phase position, or the intermediate member is omitted, and the rotation transmission member 3 is directly attached to the camshaft 1.
The same applies to the configuration in which is attached.

Further, there is a problem in the operation of the knock pin 10 when the state of the hydraulic oil, especially when the hydraulic oil contains foreign matter. As shown in FIG. 7, the gap a between the key groove 11 and the knock pin 10 (average of actual size) and the gap b between the retraction hole 8 and the knock pin 10 (same as above) are the same as those of the oil clean. Assuming a state, the knock pin 10 is set to a value (normally about 10 μ) that slides without rattling. However, if the hydraulic oil contains foreign matter, the foreign matter may be caught at the corner when the knock pin 10 enters the key groove 11, or the foreign matter may be caught even when the knock pin 10 moves in the retreat hole 8. Will not be carried out smoothly.

The present invention has been made in view of the above-mentioned problems of the conventional device. The working fluid passage is easily machined, the hydraulic pressure is efficiently used, and the knock pin is fitted in the key groove. It is a problem to be solved that the retreat is performed reliably and the reliability of switching between the phase locked state and the unlocked state is increased.

[0010]

In order to solve the above-mentioned problems, the present invention has been variously studied, and the problem can be solved by providing a fluid passage communicating at least one of the key groove and each circumferential hydraulic chamber. confirmed. That is, according to the present invention, the pressure fluid supplied to the key groove when releasing the phase locked state is further fluidized after the knock pin is completely retracted from the key groove by the fluid pressure. Since the valve opening / closing timing phase control is performed by being supplied to at least one of the circumferential pressure chambers via the passage, the fluid pressure is effectively used from the release of the phase locked state to the valve opening / closing timing phase control. In the valve opening / closing timing phase control state, the fluid entering the circumferential pressure chamber from the key groove returns to the key groove via the fluid passage and further returns to the predetermined passage from the fluid pressure supply means.

Further, since the passage on the rotary shaft side of the fluid pressure for retracting the knock pin from the key groove communicates with the fluid passage, the passage on the rotary shaft side for retracting the knock pin is used as a passage for controlling the valve opening / closing timing phase. Can be combined. Furthermore,
When the knock pin is retracted from the key groove, foreign matter in the key groove flows into the pressure chamber in the circumferential direction of the vane through the fluid passage, so that the key groove can always be maintained in a clean state and the knock pin moves smoothly in the key groove. Done.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is directed to a valve-opening / closing camshaft to which rotational power from a crank pulley is transmitted, and an inner circumference of a timing pulley which is mounted on the camshaft in a variable rotational phase angle. A plurality of circumferential hydraulic chambers each having a vane as a partition wall between the cam shaft and the cam shaft, and a rotation transmission member that transmits the rotation of the timing pulley to the cam shaft; Valve opening and closing provided with hydraulic pressure supply means for supplying hydraulic pressure to at least one of the phase advancing chamber and the lag phase chamber divided into two circumferential hydraulic chambers, and varying the relative phase between the timing pulley and the cam shaft. In the timing control device, the tip end portion is extruded by the biasing force from the retracting groove formed in one of the cam shaft and the rotation transmitting member and is formed into the other member. A knock pin that fits in the key groove and is retracted to the retract groove by the oil pressure to the key groove, and a fluid that guides the hydraulic oil supplied to the key groove to at least one of the circumferential hydraulic chambers. And a passage.

The operation of the valve opening / closing timing control device having the above construction is as follows.
When advancing the phase of the camshaft, hydraulic pressure is supplied to the phase advancing chamber from the hydraulic pressure supply means, and the camshaft is rotated in the direction in which the phase advances from the rotation transmission member to advance the phase of the camshaft with respect to the timing pulley. . When delaying the phase of the camshaft, hydraulic pressure is supplied to the retarding chamber from the hydraulic pressure supply means, the camshaft rotates in the opposite direction to the above-described phase advance, and the phase of the camshaft is delayed with respect to the timing pulley.

When the phases of the camshaft and the timing pulley are fixed, for example, in an engine in which the phase is fixed at the most advanced position, when the rotation transmitting member rotates with respect to the camshaft by the rotation angle at which the phase is most delayed, the retract groove and the key groove are formed. And the knock pin is pushed out by the force of the biasing member and fitted into the key groove. When releasing the phase locked state, the oil pressure to be supplied to the phase advancing chamber is supplied to the key groove, and the knock pressure is pushed to the retraction groove side by the oil pressure to free the knock pin. In this valve opening / closing timing control device, the hydraulic oil supplied to the key groove causes the knock pin to retreat to the retreat groove by the oil pressure thereof, and at the same time causes foreign matter in the key groove to flow through the fluid passage into the circumferential hydraulic chamber of the vane. Always keep the inside of the keyway clean.

An embodiment according to claim 2 is characterized in that the knock pin is fitted in the key groove when the rotation transmission member is controlled in the most advanced phase or the most delayed phase. In this embodiment, since the hydraulic oil flows through the fluid passage when the hydraulic pressure is maximally supplied, the hydraulic utilization efficiency is good, and the foreign material removal ability is good at the same time as the passage is shared.

However, the phase fixing position is, of course, determined by the coincident position of the key groove and the retract hole, but the coincident position is an arbitrary position (including a plurality of positions) within the range of the most advanced phase position and the most lag phase position. ). In the embodiment according to claim 3, the fluid passage is provided in the rotating shaft or the rotation transmitting member having the retracting groove in which the knock pin is arranged, so that the fluid passage is formed after the tip of the knock pin completely comes out of the key groove. It is characterized in that the hydraulic oil supplied to the key groove via the is introduced into at least one of the circumferential hydraulic chambers.

An embodiment according to claim 4 is characterized in that the gap formed between the key groove and the knock pin is larger than the gap formed between the retraction groove and the knock pin. In this embodiment, the amount of oil flowing in the fluid passage can be increased, and the foreign matter removing ability is improved as in the second aspect. In a preferred embodiment, the fluid passage can communicate with all circumferential hydraulic chambers. In this case, since two fluid passages are required for the phase advancing chamber and the phase retarding chamber, for example, two knock pins, a retract groove, and a key for releasing the phase lock at the most advanced phase position and the most retarded phase position respectively. A structure consisting of grooves is provided.

According to another embodiment of the present invention, a camshaft, to which rotational power from a crank pulley is transmitted, is rotationally transmitted to form a plurality of circumferential hydraulic chambers having vanes as partition walls between the camshaft and the camshaft. A valve opening / closing timing control device in which a member is mounted, the rotation transmission member is gear-coupled to the rotation transmission member, and hydraulic pressure is supplied to the circumferential hydraulic chamber to rotationally displace between the camshaft and the rotation transmission member material. Can be applied.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a valve opening / closing timing control device according to an embodiment of the present invention is applied to a DOHC engine, and an exhaust valve camshaft rotatably supported by a cylinder head 12. The intake valve camshaft 13 and the intake valve camshaft 14 are mounted on the outer periphery of the exhaust valve camshaft 13 so as to be relatively rotatable in the cylinder head and the intake valve camshaft 14 on the outer periphery of the intake valve camshaft 14, respectively, so that they cannot rotate relative to each other. The gear 16 is connected to the gear 16 via a power transmission means 17. The valve opening / closing timing control mechanism described below is attached to the exhaust valve camshaft 13 here.

The timing pulley 18 is provided with an exhaust valve camshaft 13 (hereinafter,
It is fastened by bolts 19 to the end of the camshaft). A stopper pin 20 having a rotation preventing function is provided at an eccentric position of the bolt 19. Cylindrical portion 21 of camshaft 13 extending into the cylinder head
Is a male screw portion 22 from the front side, a portion where radial branch passages 23a, 23a ..., 23b, 23b ... And divided circumferential passages 24, which will be described later, are formed, and the journal portion 2 on the rear side.
5, and the journal portion 25 continues to the cam forming portion 26. The gear 15 is mounted on the outer periphery of the journal portion 25 so as to be relatively rotatable as described above.

The branches 23a, 23a ..., 23b, 23
A hydraulic mechanism 27, which is the main body of the valve opening / closing timing control device, is attached to the portion where b ... And the divided circumferential passage 24 are formed. As shown in FIG. 2, the hydraulic mechanism 27 includes an inner peripheral intermediate member 28 fixed to the camshaft 13, and an intermediate member 28.
8, a vane 29 having one end moored and extending in the radial direction, and the other end of the vane 29 in the form of a circle, and includes the intermediate member 28 coaxially, and the convex portion between the concave grooves 30 a is the intermediate member 28. As shown in FIG. 1, the annular housing member 30 slidably in contact with the outer peripheral surface, the intermediate member 28, the vane 29, and the annular housing member 30 are axially sandwiched, and the concave groove 30a is fitted with the vane 29 as a partition wall. Each circumferential hydraulic chamber 31
A front plate housing member 32 and a rear plate housing member 33, and the front plate housing member 32 and the rear plate housing member 33 are pressed against each other by a bolt 34 screwed into the gear 15. Each hydraulic chamber 31 is divided into a phase advancing chamber 31a (FIG. 2) and a phase retarding chamber 31b by the vane 29.

The front plate housing member 32, the annular housing member 30 and the rear plate housing member 33 of the hydraulic mechanism 27 and the gear 15 mainly constitute the rotation transmitting member of the present invention. In addition, between the front plate housing member 32 and the front side surface of the annular housing member 30, and the rear plate housing member 33.
Although a metal touch is used to seal between the rear side surface of the annular housing member 30 and the rear side surface of the annular housing member 30, a sealing member may be interposed. To use.

The hydraulic mechanism 27 includes an intermediate member 28.
The side surface of the intermediate portion 28 facing the front side of the intermediate member 28 is in contact with the journal portion 25, and the side surface of the intermediate member 28 facing the front side of the nut 25a and the journal portion 25 are fastened to the male screw portion 22. Has been squeezed between. As a result, the intermediate member 28 is rotated integrally with the cam shaft 13.

The positioning of the cam shaft 13 and the intermediate member 28 in the circumferential direction is performed by the key pin 35 engaged with both.
(FIGS. 2 and 3). A hydraulic pressure is supplied from a hydraulic pressure supply device 36 to each hydraulic chamber 31. The hydraulic pressure supply device 36 controls the hydraulic pressure control valve 3 that controls the hydraulic mechanism 27.
7, a valve timing control device 39, etc., and a main passage 43 formed in the central axial direction in the camshaft 13 is hydraulically controlled via a connection passage 42a and an inner peripheral groove 42 formed in the cylinder head 12. It is connected to the A port of valve 37. Another trunk passage 44 is formed eccentrically in the other direction in the axial direction, and each trunk passage 44 is connected to the B port of the hydraulic control valve 37 via an inner circumferential groove 41 formed in the cylinder head 12. . In addition, P of the hydraulic control valve 37
A hydraulic pump 38 driven by an engine, for example, is connected to the port, a reservoir 40 is formed at the R port, and the hydraulic control valve 37 is connected to the valve timing control device 3.
When the operation is controlled by 9, the hydraulic mechanism 27 carries out advance and retard operations and holds the neutral position, as will be described later. The trunk 43 is each branch 23b, 2
3b ..., the respective branch passages 23b, 23b ... Are communicated with the lagging chamber 31b through the respective branch passages 45 formed in the intermediate member 28, and the respective trunk passages 44 through the divided circumferential passages 24. Communicating with the respective branch paths 23a, 23a ...
Is communicated with the phase advancing chamber 31a through each branch 46 formed in the intermediate member 28. The hydraulic pressure of one of the branches 23b, 23b is supplied to the phase lock releasing means 50 described later (in this embodiment, one phase lock releasing means for operating the most advanced phase position is provided. The hydraulic pressure is applied from the branch path 23b that guides the hydraulic pressure for the lag phase).

In addition, the trunk 43 has ball seals 4 at both ends.
It is blocked from other passages by 7, 48. That is,
The main passage 43 is formed at the same time when the lubrication passage of the cam journal on the right side of FIG. 1 is formed at the axial center of the camshaft 13, but is blocked from the lubrication passage by press-fitting the ball 47. When 48 is press-fitted and further pressed by the bolt 19, it is cut off from the outside. In addition, the other trunk line 44 has a flow resistance that is substantially equal to that of the trunk line 43.

As shown in FIGS. 2 to 4, the phase lock releasing means 50, which is a feature of the present embodiment, has a key groove 51 formed with an opening facing the outer peripheral side of the intermediate member 28, and a phase lock. In the state, the retracting hole 54 formed in the annular housing member 30 that allows the knock pin 53 to retract from the outer peripheral surface of the intermediate member 28 so that the tip portion fits into the key groove 51, and is housed in the retracting hole 54. A biasing member (spring, rubber, etc.) 55 that presses the knock pin 53 inward, and a fluid passage 52 that connects the key groove 51 and one of the circumferential hydraulic chambers 31 are formed. The fluid passage 52 communicates the key groove 51 with the nearest hydraulic chamber 31 (delayed phase chamber 31b). The fluid passage 52 is an annular housing member 30.
Whether formed on the intermediate member 28 or on both members 30,
It can also be formed in combination with 28. However, when the annular housing member 30 and the intermediate member 28 (camshaft 13) rotate relative to each other, the knock pin 53 is prevented from coming into contact with the key groove 51.
The fluid passage 52 is preferably provided in the annular housing member 30 in order to reliably remove the fluid from the first housing 1.

Further, as shown in FIG. 4, the circumferential dimension A of the opening surface of the key groove 51 is made larger than the circumferential dimension B of the opening surface of the retracting groove 54 so that the retracting groove 54 is held between the knock pin 53. The clearance a between the key groove 51 and the piston 52 is made larger than the clearance b. Here, a is set to a value sufficiently larger than the foreign particle diameter of the hydraulic oil (for example, 80 μ), and b is the withdrawal groove 54.
For example, 10 μm in which foreign matter is not caught by the corner portion of the knock pin 53 that moves on the wall surface of is selected.

The valve opening / closing timing control device of this embodiment is constructed as described above, and its operation will be described below. When the camshaft 13 is driven by the timing pulley 18 to which the rotational power of the crank pulley is transmitted, the rotation of the camshaft 13 is transmitted to the gear 15 via the intermediate member 28, the vane 29, the annular housing member 30 and the like, Further gear 1
5 is transmitted to the camshaft 3 via the gear 16 and the valves of the camshaft 13 and the valves of the camshaft 14 are operated.

Here, the gear 15 is capable of circumferential phase shifting with respect to the journal portion 25 of the camshaft 13, and the operating hydraulic pressure from the hydraulic pump 38 is passed through the hydraulic control valve 37 of the hydraulic pressure supply device 36. Is applied to the phase advancing chamber 31a, the annular housing member 30 and the gear 15 rotate counterclockwise in FIG. Shaft 13
To advance the relative phase of the camshaft 14 with respect to. Further, when the operating oil pressure from the hydraulic pump 38 acts on the retarding chamber 31b, the annular housing member 30 and the gear 15 rotate clockwise with respect to the camshaft 13 in FIG. The relative phase of the camshaft 14 with respect to the camshaft 13 is delayed by the movement angle θ of 29. Accordingly, the opening / closing timing of each valve on the camshaft 14 and the opening / closing timing of each valve on the camshaft 13 can be adjusted.

By the way, at the most retarded position of the camshaft 13 (the most advanced position of the camshaft 14), the key groove 51 and the retracting groove 54 are in phase with each other, so that the tip of the knock pin 53 is biased by the biasing member 55. Is inserted into the key groove 51 by the force of, and the phase is fixed. Next, when the hydraulic pressure to the lagging phase chamber 31b is increased, the knock pin 53 is sunk in the retreat groove 54 and the phase lock release state is established. At the same time, the keyway 51
The foreign matter staying inside is made to flow into the retarding chamber 31b through the fluid passage 52, and almost no foreign matter remains in the key groove 51. Also, when the oil pressure in the passage 23a increases,
Even when the hydraulic oil is returned from the lagging chamber 31b through the fluid passage 52 and the key groove 51 to the passage 23b side, foreign matter is not retained in the key groove 51. In this way, in this embodiment, the smoothness of the movement of the knock pin 53 in the key groove 51 is ensured, and especially when the tip end of the knock pin 53 is fitted into the key groove 51 and the phase is fixed, the corner of the knock pin 53 that moves on the wall surface of the retract groove 54 is secured. It is possible to prevent the foreign matter from being caught in the portion, and it becomes possible to perform highly reliable valve opening / closing next control.

Further, in the present embodiment, the hydraulic oil supplied to the key groove 51 when the phase locked state is released, the fluid pressure causes the knock pin 53 to be completely retracted from the key groove 51, and then the fluid passage 52. Since the valve opening / closing timing phase control is performed by being supplied to the phase advance chamber 31a via the, the fluid pressure is effectively used from the release of the phase locked state to the valve opening / closing timing phase control, and the hydraulic pressure is used very effectively. become.

Further, the hydraulic pressure in the passage 23b is changed by the knock pin 53.
And the expansion of the volume of the lagging chamber 31b,
It is not necessary to increase the number of passages 23b for retracting the knock pin 53, and the number of passages of the camshaft 13 can be reduced. Further, in the case of the present embodiment, since various measures (A> B, a> b) for enhancing the effect of removing the foreign matter are taken, it is expected that the knock pin 53 can operate smoothly.

Further, if the circumferential dimension of the key groove 51 is made larger than the circumferential dimension of the retraction groove 54 as described above, the clearance a of the knock pin 53 is inevitably large, so that machining accuracy is not required. Further, since the housing serving as the rotation transmitting member forming the hydraulic chamber 31 is composed of the annular housing member 30, and the front plate housing member 32 and the rear plate housing member 33 that sandwich both side surfaces of the annular housing member 30, Vane 29
The clearance (element that determines the hydraulic pressure) between the front plate housing member 32 and the rear plate housing member 33 can be adjusted with high accuracy, and the responsiveness is improved by a simple processing method.

Further, in the present embodiment, the labyrinth groove 57 is provided on the sliding surface between the intermediate member 28 and the annular housing member 30 which divides each hydraulic chamber 31, and the labyrinth groove 5 is provided.
In FIG. 7, hydraulic oil is collected by the hydraulic pressure from either the phase advancing chamber 31a or the phase retarding chamber 31b, the sliding of the intermediate member 28 and the annular housing member 30 is improved, and the durability is reduced by the wear reducing effect. It satisfies.

As an effect similar to that of the labyrinth groove 57, a labyrinth groove 58 can be provided on the end surface of the vane 29 as shown in FIG. The present invention is directed to a circumferential pressure chamber inside a timing pulley that transmits engine rotational force from a crankshaft through a timing belt, a timing chain, or the like, as described in JP-A-1-92504. Can be applied only to a valve opening / closing timing control device of the type that receives the rotational force of the timing pulley via a vane attached to the outer periphery of the camshaft.

[0036]

As described above in detail, according to the present invention, the number of processed passages can be reduced by using the passage for guiding the fluid to each hydraulic chamber and the passage for the fluid for operating the knock pin as well.
The fluid pressure is continuously used from the retraction of the knock pin to the phase control, and the utilization efficiency of the fluid pressure is improved. Further, the knock pin is surely fitted into and retracted from the key groove, and the reliability of switching between the phase locked state and the unlocked state can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a valve opening / closing timing control device according to an embodiment of the present invention, and a line AA indicates a broken line in FIGS. 2 and 3.

2 is a cross-sectional view showing an operation of the valve opening / closing timing control device during a phase advance, and a line BB shows a broken line in FIG. 1. FIG.

FIG. 3 is a cross-sectional view showing an operation of the valve opening / closing timing control device during a delay phase.

FIG. 4 is an enlarged cross-sectional view showing a phase lock releasing means in one embodiment of the present invention.

FIG. 5 is a front view (A) and a side view (B) showing a labyrinth groove provided in a vane.

FIG. 6 is a sectional view showing a conventional valve opening / closing timing control device.

FIG. 7 is an explanatory diagram showing a conventional phase lock releasing means.

[Explanation of symbols]

13 is a cam shaft (rotary shaft), 14 is a cam shaft,
Reference numeral 29 is a vane, 31 is a circumferential hydraulic chamber, 36 is a hydraulic pressure supply device (hydraulic pressure supply means), 50 is a phase lock releasing means, 51 is a key groove, 52 is a fluid passage, 53 is a knock pin, and 54 is a retract groove.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Noguchi 2-1, Asahi-cho, Kariya city, Aichi Aisin Seiki Co., Ltd.

Claims (4)

[Claims] 1. A plurality of rotary shafts for opening and closing a valve, to which rotary power from a crank pulley is transmitted, and a plurality of vanes as partition walls provided between the rotary shafts and the rotary shafts having variable rotation phase angles. A fluid pressure mechanism including a rotation transmitting member that forms a circumferential pressure chamber, and a fluid pressure supplied to at least one of a phase advancing chamber and a phase retarding chamber in which each circumferential pressure chamber is divided into two by the vane, A fluid pressure supply means for relatively displacing the phases of the rotation shaft and the rotation transmission member, and a tip portion is extruded by a biasing force from a retracting groove formed in one of the rotation shaft and the rotation transmission member to the other member. A knock pin that fits into the key groove and is retracted to the retract groove by the fluid pressure from the key groove, and a fluid passage that connects the key groove and at least one of the circumferential pressure chambers. Valve timing control apparatus according to claim. 2. The valve opening / closing timing control device according to claim 1, wherein the knock pin is fitted into the key groove when the fluid pressure mechanism is controlled to a most advanced phase or a latest phase. . 3. The valve opening / closing timing control device according to claim 1, wherein the fluid passage is provided in the rotating shaft or the rotation transmitting member in which the retreat groove is formed. 4. The valve opening / closing timing control device according to claim 1, wherein a gap between the key groove and the knock pin is larger than a gap between the retracting groove and the knock pin.