JP3812690B2 - Valve timing control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the invention of this application, a pressure chamber formed between a rotation shaft that opens and closes an exhaust valve or an intake valve and a rotation transmission member is divided into an advance chamber and a retard chamber by a vane, and the advance chamber and the retard chamber are divided. The present invention relates to a valve opening / closing timing control device for an internal combustion engine that controls the opening / closing timing of an intake valve or an exhaust valve by making the relative phase of a rotation shaft and a rotation transmission member variable by selectively supplying and discharging fluid. .
[0002]
[Prior art]
These types of valve opening / closing timing control devices are disclosed in, for example, Japanese Patent Laid-Open No. 1-92504 and Japanese Utility Model Laid-Open No. 2-50105. In these conventional valve opening / closing timing control devices, in order to restrict the relative displacement between the rotating shaft and the rotation transmitting member, the receiving hole, the retracting hole, and the retracting hole are accommodated and biased by the spring to the receiving hole side. A phase holding mechanism comprising a lock pin is provided.
[0003]
As shown in FIGS. 7A to 7C, this phase holding mechanism includes a rotor 2 integrally fixed to the outer periphery of the rotating shaft 1, and a rotation transmission member that can rotate relative to the outer periphery of the rotor 2. 3 are arranged. A plurality of vanes 4 extending in the radial direction of the rotor 2 are attached to the outer periphery of the rotor 2. Each vane 4 extends into a plurality of fluid pressure chambers 5 formed on the circumference between the outer side of the rotor 2 and the inner side of the rotation transmission member 3, and each of the fluid pressure chambers 5 is advanced to the advance chamber 5a. And the retarded angle chamber 5b. A retraction hole 6 is formed in the rotation transmitting member 3 in the radial direction, and a lock pin 8 urged toward the rotor 2 by a spring 7 is accommodated in the retraction hole 6. The rotor 2 is formed with a receiving hole 9 into which the lock pin 8 can be inserted. Fluid is supplied to and discharged from the advance chamber 5a through the fluid passage 10b, and fluid is supplied to and discharged from the retard chamber 5b through the fluid passage 10c. This valve opening / closing timing control device displaces the vane 4 in the range of the fluid pressure chamber 5 by the pressure difference of the fluid pressure between the advance chamber 5a and the retard chamber 5b, thereby rotating the rotation transmission member 3 and the rotor 2 (rotation). The phase with the axis 1) is converted. In the prior art shown here, the rotation transmitting member 3 and the rotor 2 (rotating shaft 1) rotate in the clockwise direction, and the positional relationship between the retracting hole 6 and the receiving hole 9 is the rotation transmitting member. 3 is provided at the most retarded position with respect to the rotation of 3. The lock pin 8 inserted into the receiving hole 9 is retracted to the retraction hole 6 against the urging force of the spring 7 by the fluid pressure of the fluid supplied through the communication path 10a. The communication path 10a merges with the fluid path 10b inside the rotary shaft 1, and the fluid path 10c is independent of the communication path 10a and the fluid path 10b.
[0004]
The operation of the prior art with the above-described configuration is performed, for example, by discharging from the most advanced position shown in FIG. 7A through the fluid passage 10c by a fluid control device (not shown), and the advanced chamber 5a and the advanced chamber 5b. The vane 4 rotates in the direction of the arrow indicated by B in FIG. As a result, the rotor 2 rotates relative to the rotation transmission member 3 to convert the phase to the most retarded position shown in FIG. When the most retarded position is reached, the positions of the retracting hole 6 and the receiving hole 9 coincide with each other, and the lock pin 8 is inserted into the receiving hole 9 by the biasing force of the spring 7 to restrict relative rotation between the rotor 2 and the rotation transmitting member 3. To do. Next, when advancing from the most retarded position, as shown in FIG. 7C, a fluid is supplied to the advance chamber 5a via the fluid passage 10b by a fluid control device (not shown), and the retard chamber is supplied. The fluid 5b is discharged through the fluid passage 10c, the fluid is also supplied to the communication passage 10a, and the lock pin 8 is discharged from the receiving hole 9 to the retracting hole 6, so that A in FIG. The vane 4 is rotated in the direction of the arrow shown.
[0005]
[Problems to be solved by the invention]
According to the above conventional valve timing control device, the lock pin 8 is inserted into the receiving hole 9 every time the rotation transmitting member 3 and the rotor 2 reach the most retarded position, and the phase is changed in the advance direction. In addition, the lock pin 8 is separated from the retraction hole 6 and the rotation transmitting member 3 and the rotor 2 are advanced by the fluid pressure difference between the advance chamber 5a and the retard chamber 5b. The technical aim of joining the communication passage 10a and the fluid passage 10b inside the rotary shaft 1 is that the fluid passage 10c acting in the retarding direction is made independent and is received when the most retarded position is reached. In order to discharge the fluid in the hole 9 and prepare a system for receiving the lock pin 8, the fluid for discharging the lock pin 8 from the receiving hole 9 and the fluid for converting the phase in the advance direction are simultaneously used. By supplying, the response of the discharging process of the lock pin 8 and the process of converting the phase in the advance direction is improved. However, since the conventional lock pin 8 is engaged with the receiving hole 9 every time the valve opening / closing timing control device is actuated to reach the most retarded position, the number of times of operation of the lock pin 8 is enormous. Durability against wear of the pin 8, development and selection of materials and material processing methods for achieving this durability, durability against the wear of the retraction hole 6 and the receiving hole 9 that support the operation of the lock pin 8, and this durability After studying various conditions such as the development and selection of materials and material processing methods to achieve this, there were problems such as having to use highly effective materials to ensure these durability .
[0006]
On the other hand, in the conventional valve opening / closing timing control device, the maximum purpose of providing the lock pin 8 and restricting the phase conversion between the rotation transmitting member 3 and the rotor 2 (rotating shaft 1) is as follows. That is, when the fluid pressure source in the advance chamber 5a and the retard chamber 5b is reduced due to the stop of the fluid pressure source, such as when the engine is stopped, and then the engine is started, At the same time, since the fluid pressure inside the advance chamber 5a and the retard chamber 5b cannot be secured, the vane 4 can freely rotate in the fluid chamber 5. As the vane 4 moves, the vane 4 comes into contact with the inner wall of the fluid chamber 5 to generate a hitting sound. In order to prevent this hitting sound, the vane 4 also needs to be restricted from moving, and at least until the fluid pressure in the advance chamber 5a and the retard chamber 5b immediately after engine startup is secured, A lock pin 8 is provided to restrict phase conversion with the rotor 2 (rotating shaft 1). Conversely, during normal operation of the engine, at least one of the advance chamber 5a and the retard chamber 5b is filled with fluid, so the vane 4 cannot freely rotate in the fluid chamber 5. The problem of sound generation does not occur.
[0007]
The present invention has been made in view of the above-described problems of the prior art. For the purpose of improving the durability of the lock pin, the engagement between the rotation transmission member and the rotor (rotary shaft) by the lock pin is started in the engine. A valve opening / closing timing control device that is operated only at times and prevents the lock pin from being inserted into the receiving hole during normal operation of the engine is disclosed.
[0008]
[Means for Solving the Problems]
Means taken in the invention according to the valve timing control apparatus according to claim 1 to solve the problems described above, the rotational axis of the valve opening and closing rotational power from the crank pulley is transmitted, the rotary shaft with a predetermined range a rotation transmitting member which is rotatable relative exterior in, a vane attached to one of said rotary shaft and the rotation transmitting member, for advancing the said vane is formed between the rotation transmission member and the rotating shaft A fluid pressure chamber divided into a chamber and a retardation chamber; a first fluid passage for supplying and discharging fluid to the advance chamber; and a second fluid passage for supplying and discharging fluid to the retardation chamber; includes a small diameter portion on the tip side, a lock pin having a large diameter portion on the base end side, formed on one of said rotary shaft and the rotation transmitting member, with the other side of the rotary shaft and the rotation transmitting member therein A retraction hole for accommodating the biased lock pin; Formed on the other of the rotational shaft and the rotation transmitting member, a receiving hole diameter portion of the lock pin when the relative phase between the rotation transmitting member and the rotary shaft is synchronized with a predetermined phase are inserted, the receiving a third fluid passage for supplying and discharging fluid into the hole, Ru and a fluid damper which is formed in the gap between the locking pin and the retracting hole.
By forming a fluid damper between the lock pin and the retraction hole, it is possible to prevent the lock pin from moving to the receiving hole side while the engine is rotating and the fluid pressure from the fluid source is secured. It is possible to prevent the small diameter portion of the pin from being inserted into the receiving hole. On the other hand, when the fluid pressure of the fluid source is not sufficiently supplied to the advance chamber or the retard chamber due to an engine stop or the like that requires the small diameter portion of the lock pin to be inserted into the receiving hole, the fluid to the fluid damper is also The small diameter portion of the lock pin is quickly inserted into the receiving hole without being supplied, and the phase shift between the camshaft and the external rotor can be regulated.
[0009]
Then, an opening in which evacuation holes can enter and leave the small diameter portion of the lock pin, that form a fluid chamber which is disposed between the side wall of the fluid damper is retracted hole and the small diameter portion. With this configuration, the fluid damper can be disposed in the operating region of the lock pin that is operated by the fluid pressure, and a compact valve opening / closing timing control device can be obtained without requiring a new configuration for forming the fluid damper. it can.
[0010]
Further , a slit passage that connects the receiving hole and the fluid chamber is formed on the sliding surface between the small diameter portion of the lock pin and the retraction hole opening. In order to form the fluid damper, it is necessary to take a minimum amount of fluid into the fluid damper. On the other hand, in order to prevent the operation of the lock pin, it is necessary to store pressure inside the fluid damper. In order to satisfy this contradictory requirement, a slit passage is formed on the sliding surface between the small-diameter portion of the lock pin and the opening of the retraction hole, and the fluid pressure is maintained while taking in the fluid inside the damper by securing a minute passage. It becomes possible to do.
[0011]
The invention of claim 2 is that the slit passage, as a slit groove formed on the small diameter side wall of the lock pin. By forming a slit groove in the side wall of the small diameter portion of the lock pin, processing can be performed more easily than when a slit passage is formed in the retraction hole opening.
[0012]
In the invention of claim 3, the slit passage is formed at the distal end side of the small diameter portion of the lock pin . With this configuration, when the tip of the small-diameter portion of the lock pin protrudes from the opening of the retraction hole, that is, when the volume of the fluid damper is large, fluid communication is possible through the slit passage. In a state in which the root portion of the small diameter portion projects into the opening of the retraction hole, that is, in a state where the volume of the fluid damper is small, the slit passage is closed and fluid communication is lost. Therefore, the speed at which the lock pin protrudes from the retraction hole or the retraction speed at the retraction hole can be made variable.
[0013]
A fourth aspect of the present invention, the position of the retracting hole and the receiving hole is a position where the rotation transmission member and the rotation axis is synchronized at the most retarded position, is in the second passage and the third passage meet at the internal rotating shaft . Accordingly, since the retarded fluid is supplied to the fluid passage for discharging the lock pin from the receiving hole until just before the retracting hole and the receiving hole are synchronized, the valve is kept until just before reaching the most retarded position. The fluid that operates the opening / closing timing control device can prevent the lock pin from being inserted into the receiving hole, and can supply sufficient fluid into the fluid damper.
[0014]
In the invention of claim 5 , an elastic member is arranged on at least one of the stepped portion or the back surface of the lock pin. By disposing the fluid damper, when the lock pin is in the maximum projecting state, the projecting speed is reduced by the action of the fluid damper, so the impact sound that the lock pin contacts the peripheral member can be reduced. When the lock pin is inserted (projected) by the elastic member, it is possible to reliably prevent the impact sound when the step portion collides with the inner wall of the retraction hole, and when the lock pin is retreated by the elastic member arranged on the back surface of the lock pin. The impact sound with the retainer arranged on the back surface of the lock pin can be reliably prevented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment according to the present invention will be described with reference to the drawings.
[0016]
In FIG. 1, reference numeral 12 denotes a camshaft (rotary shaft) to which a cam (not shown) for opening and closing an intake valve rotatably supported by a cylinder head (not shown) is attached. The valve opening / closing timing control apparatus according to the present invention is attached to the tip of the camshaft 12 as will be described in detail below. In this embodiment, the rotation transmission member includes a timing pulley 14, an outer rotor 18 and an outer plate 20 to which a rotational force of a crankshaft (not shown) is transmitted by a belt or a chain. It is fixed so as not to rotate relative to one another. An inner rotor 22 is attached to the tip end portion of the camshaft 12 so as not to be relatively rotatable by a bolt 17 inside the outer rotor 18 having a substantially cylindrical shape. Therefore, the rotation transmission member having the outer rotor 18 as a main member and the camshaft 12 are formed so as to be capable of relative rotation between the outer peripheral surface of the inner rotor 22 and the inner peripheral surface of the outer rotor 18. The external rotor 18 is rotated in the clockwise direction in FIG. 1 by a belt or a chain. Inside the camshaft 12, a retard passage 28 and an advance passage 30 extending in the axial direction of the camshaft 12 are cut. One end of each of the retard passage 28 and the advance passage 30 communicates with the outer oil supply / discharge ports 35 and 36 on the valve opening / closing timing control device side, and the other end communicates with the outer oil supply / discharge ports 32 and 34. . The oil as a fluid supplied from an oil pump (not shown) is selectively supplied and discharged through the switching valve 111 through the outer peripheral oil supply / discharge ports 32 and 34. The fluid can be replaced with a gaseous medium such as air in addition to a liquid medium such as oil.
[0017]
The switching valve 111 slides the spool 113 in the right direction in the figure against the spring 114 by energizing the solenoid 112, and takes in the oil supplied from the oil pump from the oil passage 115, and has one port. The passage 117 communicates with the outer peripheral oil supply / discharge port 32, and the other port passage 116 communicates with the outer peripheral oil discharge port 34. 119 is a drain. When the solenoid 112 is not energized, the port passage 117 is in a supply pressure state and the port passage 116 is in an exhaust pressure state, and vice versa when the solenoid 112 is energized. Accordingly, oil is supplied to the advance passage 28 when energized, and oil is supplied to the retard passage 30 when not energized.
[0018]
FIG. 2 shows an AA cross section of FIG. FIG. 2 is a drawing in which a lock pin 44 described later is in a locked state.
[0019]
As shown in FIG. 2, five pressure chambers 38 formed by the partition wall 33 and one retraction hole 40 are formed on the inner peripheral side of the outer rotor 18. Each pressure chamber 38 is partitioned into a working chamber 38a (advance chamber) and a working chamber 38b (retard chamber) by a vane 52 that is fixed to the inner rotor 22 and protrudes in the radial direction. The vane 52 is urged in the centrifugal direction by a spring member 49 disposed at the end on the inner rotor 22 side (see FIG. 1). The working chamber 38 a communicates with the outer peripheral oil supply / discharge port 36 of the advance passage 28 via an intermediate passage 54 formed in the inner rotor 22, and the working chamber 38 b is retarded via an intermediate passage 56 formed in the inner rotor 22. The outer periphery oil supply / discharge port 35 of the corner passage 30 is communicated with.
[0020]
The retraction hole 40 provided in the external rotor 18 is sealed with a lid member 42 having an air vent on the outside, and a spring 46 constituting an urging means is disposed on the inside, and the spring 46 is retreated. The lock pin 44 positioned inside the hole 40 is urged inward (inner rotor 22 side). The lock pin 44 includes a small-diameter portion 44 a having a small diameter at the distal end portion and a large-diameter portion 44 b having a large diameter on the proximal end side adjacent to the spring 46. The opening 41 of the retraction hole 40 has substantially the same diameter as the lock pin 44, and a receiving hole 48 having substantially the same diameter as the opening of the retraction hole 40 is formed on the outer periphery of the inner rotor 22. A communication passage 50 extending toward the center of the inner rotor 22 is formed in the center of the bottom of the receiving hole 48, and the communication passage 50 communicates with the outer peripheral oil supply / discharge port 36 of the camshaft 12. Accordingly, the communication passage 50 communicates with the retard passage 30 and the intermediate passage 56 via the outer peripheral oil supply / discharge port 36. The lock pin 44 is discharged from the receiving hole 48 against the biasing force of the spring 46 that biases the lock pin 44 toward the inner rotor 22 by the fluid pressure of the oil supplied to the receiving hole 48 through the retarding passage 30 and the communication passage 50. can do.
[0021]
In the present embodiment, the phase of the camshaft 12 and the external rotor 18 when the receiving hole 48 and the retracting hole 40 are in phase is set to the most retarded state. That is, as shown in FIG. 2, when the vane 52 minimizes the working chamber 38a that is on the pressure supply side when it is advanced, the phases of the receiving hole 48 and the retracting hole 40 coincide.
[0022]
3A and 3B, an enlarged view of the lock pin 44 is shown, and a step 44c between the small diameter portion 44a and the large diameter portion 44b of the lock pin 44 and the inner wall of the retraction hole 40 are A hydraulic damper 58 is formed between them. The sliding portion between the outer periphery of the small diameter portion 44 a of the lock pin 44 and the opening 41 of the retraction hole 40 and the sliding portion between the outer periphery of the large diameter portion 44 b of the lock pin 44 and the inner peripheral wall of the retraction hole 40 are It is a liquid-tight gap that does not hinder operation. Therefore, when the lock pin 44 is inserted into the receiving hole 48 by sealing the fluid, that is, oil in the hydraulic damper 58, the oil in the hydraulic damper 58 needs to be discharged from the hydraulic damper 58, and during normal engine operation. Even when the phase of the camshaft 12 and the external rotor 18 reaches the most retarded state, the operation of the lock pin 44 can be prevented. 3A shows a state in which the small diameter portion 44a of the lock pin 44 is inserted into the receiving hole 48, and FIG. 3B shows a state in which the lock pin 44 is discharged into the retraction hole 40.
[0023]
FIG. 4 shows a modification of the lock pin. The lock pin 60 shown in FIG. 4 includes a small-diameter portion 60a and a large-diameter portion 60b, and a facing surface between the step portion of the lock pin 60 and the small-diameter portion 60a of the large-diameter portion 60b (the back surface of the lock pin 60). Are provided with cushion materials 62 and 64 formed of oil-resistant rubber (for example, NBR), resin, or the like. The cushion members 62 and 64 can prevent the occurrence of a hitting sound that comes into contact with the vicinity of the opening 41 of the retraction hole 40 when the lock pin 60 protrudes and a hitting sound that comes into contact with the lid 42 when the lock pin 60 retracts. . The cushion members 62 and 64 can be attached to the vicinity of the opening 41 of the retraction hole 40 or to the lid 42 without being attached to the lock pin 60 as shown in FIG. In addition, axial slits 66 formed at appropriate intervals are formed on the outer peripheral wall of the small diameter portion 60a. This slit 66 is advantageously formed at the tip of the small diameter portion 60a. In the present embodiment, as shown in FIG. 4, a slit groove 66 having a length L2 is formed on the distal end side of the small diameter portion 60a, and a portion where the slit groove 66 is not formed is formed on the proximal end side of the small diameter portion 60a. Only L1 is left. Note that the length of L1 is equal to the length of L3 from the position shown in FIG. 4 to the maximum protruding position when the lock pin 60 protrudes. By forming the slit groove 66 having such a length in the small diameter portion 60 a, the hydraulic damper 58 allows the communication path 50 to pass through even if the distal end portion of the small diameter portion 60 a of the lock pin 60 is positioned at the opening 41 of the retraction hole 40. Oil can be supplied through the slit 66, the retraction response of the lock pin 60 can be enhanced, and malfunction can be prevented.
[0024]
Next, the operation of the present embodiment will be described with reference to FIGS. 2, 5, and 6.
[0025]
FIG. 2 shows that the oil pressure in the retard passage 28, the advance passage 30, the working chambers 38a and 38b, the communication passage 50, and the intermediate passages 54 and 56 is reduced by stopping the oil pump (not shown). The lock pin 44 is inserted into the receiving hole 48 by the urging force of the spring 46, that is, the locked state is shown. By inserting the lock pin 44 into the receiving hole 48 in this manner, relative rotation between the inner rotor 22 and the outer rotor 18 is restricted. Even if the lock pin 44 cannot be inserted into the receiving hole 48 because the positions of the retraction hole 40 and the receiving hole 48 do not match when the engine is stopped, the working chambers 38a, 38b are not activated when the engine is started. When the vane 52 rotates relative to the retard side due to the decrease in the oil pressure, the lock pin 44 engages with the receiving hole 48 at the same time as the most retarded position.
[0026]
In the case of advancing from the most retarded position in FIG. 2, the one-end switching valve 111 is deenergized and oil is supplied to the working chamber 38 b through the retard passage 30 and the intermediate passage 56. At this time, oil is also supplied to the communication passage 50 communicating with the intermediate passage 56, and the lock pin 44 is discharged from the receiving hole 48 (see FIG. 5). Thereafter, the switching valve 111 is energized to supply oil to the advance passage 28 and supply oil to the working chamber 38a through an intermediate passage 54 communicating with the advance passage 28.
[0027]
FIG. 6 shows a state in which the lock pin 44 is discharged into the retraction hole 40 as described above, and the internal rotor 22 rotates relative to the external rotor 18 in the advance direction.
[0028]
On the other hand, when the relative position between the outer rotor 18 and the inner rotor 22 is switched from the advanced state to the retarded state, the switching valve 111 is deenergized and oil is supplied to the working chamber 38b via the retard passage 30 and the intermediate passage 56. Supply. Here, when the intermediate passage 56 and the communication passage 50 communicate with each other, when the oil is supplied to the working chamber 38 b and the internal rotor 22 is relatively rotated to the retard side, the oil passes through the communication passage 50. The receiving hole 48 and the hydraulic damper 58 are also filled. Therefore, even when the most retarded position shown in FIG. 5 is reached, the lock pin 44 is urged outward by the oil filled in the receiving hole 48 and the hydraulic damper 58, and the lock pin 44 urged by the spring 46 is received. Insertion into the hole 48 can be prevented.
[0029]
As described above, in the present embodiment, since the hydraulic damper 58 is formed in the retraction hole 40, the lock pin 44 can be prevented from being inserted into the receiving hole 48 during the operation of the engine. During rotation of the engine in which the drive source is operated, the lock pin 44 is not operated, and unnecessary operation of the lock pin 44 can be prevented and durability of the lock pin 44 can be improved. .
[0030]
In the present embodiment, the retarding hydraulic pressure is supplied to the receiving hole 48 by communicating the communication passage 50 with the intermediate passage 56, but the communication passage 50 and the intermediate passage 54 are communicated to advance to the receiving hole 48. It is also possible to supply angular hydraulic pressure. In this case, it is possible to exclude the step of supplying the one-time retarded hydraulic pressure when the phase shift is changed in the advance direction performed in the above embodiment.
[0031]
【The invention's effect】
According to the first aspect of the present invention, by forming a fluid damper between the lock pin and the retraction hole, while the fluid pressure from the fluid source is secured during engine rotation, the lock pin receiving hole is provided. The movement to the side can be prevented.
[0032]
The retraction hole has an opening through which the small diameter portion of the lock pin can enter and exit, and the fluid damper forms a fluid chamber disposed between the retraction hole and the side wall of the small diameter portion, so that the fluid damper is operated by fluid pressure. It can be disposed in the operating region of the lock pin, and a compact valve opening / closing timing control device can be obtained without requiring a new configuration for forming a fluid damper.
[0033]
Furthermore , a slit passage that connects the receiving hole and the fluid chamber is formed on the sliding surface between the small diameter portion of the lock pin and the retraction hole opening, so that a minimum amount of fluid is required in the fluid damper to form the fluid damper. Pressure can be stored and pressure can be stored inside the fluid damper to prevent actuation of the lock pin.
[0034]
According to the invention of claim 2, since the slit passage is a slit groove formed on the side wall of the small diameter portion of the lock pin, the slit passage is formed on the opening of the retraction hole by forming the slit groove on the side wall of the small diameter portion of the lock pin. Compared with this, processing can be performed easily.
[0035]
According to the invention of claim 3, since the slit passage is formed at the distal end side of the small diameter portion of the lock pin, the speed at which the lock pin protrudes from the retract hole or the speed at which the lock pin retracts can be made variable. .
[0036]
According to the fourth aspect of the present invention, the position of the retracting hole and the receiving hole is a position where the rotating shaft and the rotation transmitting member are synchronized when the most retarded position is reached, and the second passage and the third passage are merged inside the rotating shaft. Therefore, since the retarded fluid is supplied to the fluid passage for discharging the lock pin from the receiving hole until just before the retracting hole and the receiving hole are synchronized, immediately before reaching the most retarded position. The fluid that operates the valve opening / closing timing control device can prevent the lock pin from being inserted into the receiving hole, and can supply sufficient fluid into the fluid damper.
[0037]
According to the fifth aspect of the present invention, since the elastic member is disposed on at least one of the stepped portion or the back surface of the lock pin, it is possible to prevent a hitting sound when the lock pin is activated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a valve opening / closing timing control apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIGS. 3A and 3B are detailed views of a main part of FIG. 2, in which FIG. 2A is a diagram illustrating an engagement state of a lock pin, and FIG.
FIG. 4 is a view showing a modified example of the lock pin of the embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a valve opening / closing timing control device according to an embodiment of the present invention, and is a view showing a state in which the valve is moved to an advanced angle state.
FIG. 6 is a cross-sectional view showing the valve opening / closing timing control apparatus according to the embodiment of the present invention, showing a state in which a slight advance operation is performed.
FIG. 7 is an operation explanatory diagram showing a conventional valve timing control apparatus.
[Explanation of symbols]
12 ... Camshaft (rotary shaft)
18 ... External rotor (rotation transmission member)
22 ... Internal rotor (rotary shaft)
38 ... Pressure chamber (fluid pressure chamber)
38a ... Working chamber (advance chamber)
38b ... Working chamber (retarding chamber)
40 ... Retraction hole 44 ... Lock pin 48 ... Reception hole 50 ... Communication passage (third fluid passage)
52 ... Vane 54 ... Intermediate passage (first fluid passage)
56 ... Intermediate passage (second fluid passage)
58 ... Hydraulic dampers 62, 64 ... Cushion material (elastic member)
66 ... Slit

Claims (5)

A rotary shaft for opening and closing a valve through which rotational power from the crank pulley is transmitted;
A rotation transmission member that is externally rotatable relative to the rotation shaft within a predetermined range;
A vane attached to one of the rotating shaft and the rotation transmitting member;
A fluid pressure chamber formed between the rotation shaft and the rotation transmission member and divided into an advance chamber and a retard chamber by the vane;
A first fluid passage for supplying and discharging fluid to the advance chamber;
A second fluid passage for supplying and discharging fluid to the retardation chamber;
A lock pin having a small diameter portion on the distal end side and a large diameter portion on the proximal end side;
Formed on one of said rotary shaft and the rotation transmitting member, and a retracted hole for accommodating the biased the locking pin on the other side of the rotary shaft and the rotation transmitting member therein,
Formed on the other of said rotary shaft and the rotation transmitting member, a receiving hole diameter portion of the lock pin when the relative phase between the rotation transmitting member and the rotary shaft is synchronized with a predetermined phase are inserted,
A third fluid passage for supplying and discharging fluid to and from the receiving hole;
A fluid damper formed in a gap between the lock pin and the retraction hole ;
The retraction hole has an opening through which the small diameter portion of the lock pin can enter and exit, and the fluid damper forms a fluid chamber disposed between the retraction hole and the side wall of the small diameter portion,
A valve opening / closing timing control device in which a slit passage for communicating the receiving hole and the fluid chamber is formed on a sliding surface between the small diameter portion of the lock pin and the opening . The valve opening / closing timing control device according to claim 1 , wherein the slit passage is a slit groove formed in a side wall of a small diameter portion of the lock pin. 3. The valve opening / closing timing control device according to claim 2 , wherein the slit passage is formed on a distal end side of a small diameter portion of the lock pin. The position of the front retraction hole and the receiving hole is a position where the rotation shaft and the rotation transmission member are synchronized when the most retarded position is reached, and the second passage and the third passage are merged inside the rotation shaft. The valve timing control apparatus according to any one of claims 1 to 3 , wherein The valve opening / closing timing control device according to any one of claims 1 to 4 , wherein an elastic member is disposed on at least one of the step portion or the back surface of the lock pin.

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