JPS6166811A - Tappet mechanism with suspension function in internal-combustion engine - Google Patents

Abstract

PURPOSE:To miniaturize a hydraulic rush adjuster and make it light-weight by providing a check ball in the hydraulic rush adjuster, and forming release means for an actuator being operating means for said check ball with a form storage alloy. CONSTITUTION:In a case where fuel is cut out over a long period of time when an engine is rotated at a low rpm under low load, temperature of engine oil circulating through a path of from a pressure oil supply device to a supply hole 16, a communication hole 15, and a low pressure chamber 13 is relatively low, and hence a coil-shaped suspension release member 24 comprising a form storage alloy is present in a low temperature phase. Accordingly, a bias spring 25 pushes a check ball 19 downwardly against the suspension release member 24 and a check ball spring 20 for opening an orifice path 10. Therefore, when a body 7 is pushed up by a cam, any oil existent in a high pressure chamber 14 is discharged to the low pressure chamber 13 and the succeeding stages to permit a plunger 8 to be moved realtively downwardly in a body 7, is transmitted to an intake/exhaust valve to result in the intake/exhaust valve being made a non-operation state.

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a valve train mechanism that has the function of appropriately stopping the cylinders of an internal combustion engine, particularly when the internal combustion engine rotates at a low speed. This invention relates to a valve train mechanism that can change the number of active cylinders by stopping a predetermined cylinder, etc.

(Prior Art) In recent years, there has been an increasing demand for energy conservation and fuel efficiency. Therefore, in order to reduce fuel consumption 1 during actual use of an internal combustion engine, a valve train mechanism has been developed that has the function of stopping the cylinders as appropriate depending on the operating conditions of the internal combustion engine, and changing the number of operating cylinders and the operating exhaust system. There are various types of them that are publicly known.

A valve mechanism with the above function generally has a solenoid valve installed inside the hydraulic lash adjuster, and this solenoid valve presses a check ball connected to a push rod to release the hydraulic pressure and deactivate the tappet. method is known.

(Problems to be Solved by the Invention) However, in this method of pressing the check ball using a solenoid valve, the shapes of the push rod and the solenoid valve device are large and complex, and it takes a long time to incorporate them into a small hydraulic lash adjuster. I don't. However, there are disadvantages in that the assembly work becomes difficult and the weight of the hydraulic lash adjuster increases. If the weight of the hydraulic lash adjuster increases, there is a problem that the hydraulic lash adjuster cannot follow the internal combustion during high-speed rotation due to its inertia.

In addition, the solenoid valve method requires a solenoid valve device, electrical wiring, a switch system, etc., and the mechanism is complicated. ! Not only does this become complicated and lead to increased costs, but there are also problems such as operational errors and deterioration of the solenoid valve device due to engine oil.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a plunger 8 having an orifice passage 10 that moves the inside of the hydraulic lash adjuster 6.42.46.47.52 into a high pressure chamber 14. A check ball 19 for opening and closing the orifice passage 10 is provided in the high pressure chamber 14, and a check ball 19 is provided in the hydraulic lash adjusters 6.42, 46.47.52. A bias elastic member 25 is provided as an actuator means, and a pause release member 24 is provided as a release means for the actuator means, and the pause release member 24 is made of a shape memory alloy set to restore the shape of the high temperature phase at a predetermined temperature. We adopted the method of forming the

(Function) First, when the engine oil temperature is relatively low, such as when the internal combustion engine speed is low, when the load is small, when the fuel is cut off for a long time due to engine braking, etc. In this case, the internal combustion engine generally does not require large amounts of torque or horsepower.

At this time, the engine oil quickly circulates through the low pressure chamber 13 to the stop release member 24.
The shape memory alloy is cold IJl and is in the 11 (4 phase) state. At this time, the check ball 19 is opened by the actuator action of the bias elastic member 25, and the orifice passage 10
releases. Therefore, hydraulic lash adjuster 6.42
．． 46.47°52 is in an inactive state, and that cylinder is also in an inactive state.

Next, ■When the rotational speed of the internal combustion engine is high, (■When the engine oil is heated to a high temperature, such as when the mouth is large, the internal combustion engine requires large torque and horsepower.) Ru.

At this time, is the suspension release member 24 set? P Q.

When the temperature reaches this point, the shape memory alloy reversely transforms into the high temperature phase, so that the pause release member 24 returns to the set shape in the high temperature phase. This restoring force releases the actuator action of the bias elastic member 25.

Therefore, hydraulic lash adjuster 6.42, 46°47
．． 52 is in an operating state, and its cylinders are also in an operating state.

The above action is performed reversibly when the temperature rises above the set temperature and when it falls below the set temperature.

(Example) The following is a first example of the present invention as an OHV valve! ! A first embodiment of an internal combustion engine for an automobile having a structure will be described with reference to FIG. 1.2. This internal combustion engine is of a type that uses both a hydraulic lifter and a hydraulic lash adjuster.

On the side of the cylinder 1 of the internal combustion engine, there is a cam 2 for opening and closing the intake and exhaust valves.
A fixed camshaft 3 extends. A sleeve 5 is provided in the housing 4 of the internal combustion engine directly above the cam 2.

A hydraulic lifter/hydraulic lash adjuster 6 (simply referred to as a hydraulic lash adjuster in this embodiment) is slidably inserted into the sleeve 5, and the lower surface of a cylindrical container-shaped body 7 forming the outermost part thereof is It is in contact with the cam 2. A plunger 8 is slidably inserted into the body 7, and an orifice passage 10 is formed in the actuation plate 9 at the bottom of the plunger 8. A seat 11 is attached to the top of the plunger 1-8. A through hole 12 for lubrication is provided in the center, and one surface is gently curved and recessed.

The hydraulic pressure in the hydraulic lash adjuster 6 is divided into upper and lower halves by an operating plate 9 of the plunger 8. That is,
A low pressure chamber 13 closed by the plunge V8 and the seat 11 is formed above the actuation plate 9, and a high pressure chamber 14 closed inside the body 7 is formed below the actuation plate 9. The low pressure chamber 13 is connected to a pressure oil supply device (not shown) such as an oil pan or a pump through a communication hole 15 provided at the top of the plunger 8 and a supply hole 16 provided at the top of the body 7. has been done.

A bowl-shaped retainer 1 is attached to the lower surface of the actuating plate 9 of the plunger 178.
7 is attached, and the plunger 8 is urged upward by a return spring 18 installed between the retainer 17 and the inner bottom surface of the body 7. Also, one check ball for opening and closing the orifice passage 10 is installed inside the retainer 17. One check ball is biased upward by a check ball spring 20 installed between it and the inner bottom surface of the retainer 17, so that it can come into contact with the actuating plate 9 as appropriate to close the orifice passage 10. . Note that the retainer 17 has a center angle of 120 mm.
A slit for oil circulation is provided at every interval.

A push rod 21 is connected to the upper end of the check ball 19 and extends through the orifice passage 10 and projects into the low pressure chamber 13 . Further, a locking plate 22 is provided approximately at the center of the push rod 21.
is attached. An actuator main body 23 is attached to the upper surface of the actuating plate 9, and the push rod 21 passes through the top plate 23a of the actuator main body 23. Further, the actuator body 23 is also provided with slits for oil circulation every 1201 points in the central angle.

A bias spring 25 as an actuator means for the check ball 19 is installed between the locking plate 22 of the push rod 21 and the top plate 23a of the actuator body 23, and is made of a general spring material such as steel into a coil spring shape. is formed. The bias spring 25 urges the check ball 19 downward to completely disable the hydraulic lash co-adjuster 6. Furthermore, the bias spring 25 constantly presses the pause release member 24, which will be described next, and has the metallurgical significance of reducing the hysteresis phenomenon described in 1 by applying a compressive force during the transformation of the shape memory alloy. have.

On the other hand, the locking plate 22 of the push rod 21 and the actuator means 2
A pause release member 24 as a release means for the actuator means is installed between the bottom lN25b of 3 and is formed into a coil spring shape using a shape memory alloy, which will be described in detail later. The shape is that of an extended coil spring). Since the pause release member 24 is compressed by being pressed by the bias spring 25 when the temperature is low, it does not apply a biasing force to one check ball and allows the hydraulic lash adjuster 11 to be in a non-operating state. The shape of the check ball 24 is set to be strongly restored to the extended state at 1 when the temperature is high 113, and the check ball 19 is urged upward to activate the hydraulic lash adjuster 6.

The lower end of a bushing rod 30 is brought into contact with the recess on the upper surface of the seat 11 so as to close the through hole 12, and oil lubrication is achieved between the two. An intake and exhaust valve 32 is slidably inserted into the cylinder head 31 and is urged upward by a valve spring 33. Internal combustion engine cam cover 3
4, a rocker shaft 35 extends, and a rocker arm 36 is swingably supported on the rocker shaft 35. The upper end of the bushing rod 30 and the intake/exhaust valve 3 are provided on the lower surface of both ends of the rocker arm 36, respectively.
The upper end of 2 is in contact with the upper end of 2.

Next, the shape memory alloy that is the material for forming the pause release member 24 will be described in detail.

Shape memory effect refers to a phenomenon in which a material memorizes its shape in its high-temperature phase, and no matter how much it deforms in its low-temperature phase, it instantly returns to its original i4-phase shape when heated a little.
Alloys that exhibit this phenomenon are called shape memory alloys. In short, the shape (QΔ19!) is a phenomenon that occurs when a material undergoes deformation in a product and then undergoes reverse transformation to the Bi crystal phase by heating.

When this shape memory alloy is applied to the pause release member 24 in the actuator body 23 as in this embodiment, it is necessary to solve the problem of hysteresis.

Hysteresis is due to the difference between the martensite start temperature and the reverse transformation start temperature of the shape memory alloy, and this temperature difference is generally 15-17°C. In order to reduce this hysteresis, it is effective to add a pie-scar by utilizing the effect of stress on the transformation temperature. Therefore, in this embodiment, the suspension release member 24 is used in combination with the bias spring 25, and the hysteresis width of the suspension release member 24 is ±0.9° C. or less.

In the case of this embodiment, for example, when the rotation speed of the internal combustion engine is low (
That is, the check ball 19 is opened when the engine oil is high in temperature), and the check ball 19 is opened when the internal combustion engine speed is high (i.e., when the engine oil is high in temperature).
By closing the check ball 19 (when the engine oil is at high temperature), the number of cylinders can be varied as necessary. Here, the deactivation release member 24 reversibly changes within a range of ±0.9°C of the shape memory alloy restoration set temperature (hereinafter simply referred to as set temperature), so the number of operating cylinders is reversibly switched at a substantially constant temperature. It became possible.

In this example, the set temperature is, for example, 90°C, but this set temperature is not limited to 90°C (it can be arbitrarily selected by changing the composition of the shape memory alloy. In the separate section, the temperature during normal operation reaches 80 to 120°C, so it is appropriate to set it at 80°C or higher.

Shape memory alloys include Ti-Ni, AQ-Cd
, Au-Cd, Cu-A I'-N i , Cu
-Au-Zn, Cu-3n, Cu-Zn, Cu-Zn-
Although various types such as A1 have been announced, Ti--Ni alloy is the most common. Moreover, it is more economical than Cu-Zn-Al alloy 1, and has recently attracted attention.

Next, the effects of the first embodiment configured as described above will be explained.

First, the humidity of engine oil is relatively low, for example, at about 80° C., when (1) the rotational speed of the internal combustion engine is low, (2) the load is small, and (2) the fuel is cut off for a long time due to engine braking or the like.

In such cases, the internal combustion engine generally does not require large amounts of torque or horsepower.

At this time, the engine oil quickly circulates (circulates) to the spring 24 through a pressure oil supply device (not shown) such as an oil pan, a pump, etc., the supply hole 16, the communication hole 15, and the low pressure to 13. Therefore, the first stop is released. The temperature of the member 24 is relatively low (for example, about 80° C.), which is almost the same as that of engine oil. That is, the shape memory alloy of the deactivation release member 24 is in a low temperature phase.

At this time, as shown in FIG.
are the stop release member 24 and the check ball spring 20
Press one check ball downward against the elastic force of
The orifice passage 10 is opened.

Therefore, when the cam 2 rotates and pushes up the lower surface of the body 7 of the hydraulic lash adjuster 6, the plunger 8 moves downwardly within the body 7 while discharging the engine oil in the high pressure air 14 to the low pressure chamber 13 and beyond. Moving.

Therefore, the hydraulic lash adjuster 6 is in a non-operating state in which the displacement of the cam 2 cannot be transmitted to the bushing rod 30, and the cylinder is in a non-operating state with the intake and exhaust valves 32 remaining closed.

Next, a case will be described in which the temperature of the engine oil rises to a set temperature, for example, 90° C. or higher, when (1) the rotational speed of the internal combustion engine is high, (2) the load is large, etc. In such cases, large torque and horsepower are required from the internal combustion engine.

The engine oil quickly circulates through the path to the spring 24, and the temperature of the stop release member 24 increases immediately. When the temperature of the pause release member 24 reaches within a range of ±0.9°C from the set temperature, for example, 90”C, the shape memory alloy reversely transforms to the high temperature phase, so the pause release member 24 is set in the high temperature phase. This restoring force is extremely strong, so the stop release member 24 presses the check ball 19 upward against the elastic force of the bias spring 25 and is moved in the direction of closing the orifice passage 10. to strengthen

Therefore, even if the cam 2 rotates and pushes the lower surface of the body 7 downward, the engine oil in the high pressure chamber 14 is removed from the low pressure chamber 13.
does not move to Also, press the bottom surface of cam 2 or small di
GJ'I: At the moment, the engine oil passes through the above path, pushes down the check ball 19, and pushes down the bushing rod 30.
The rocker arm 36 is supplied until the rocker arm 36 and the rocker arm 36 are securely abutted without any clearance. When engine oil fills the high pressure air 1/I and the cam 2 rotates with the check ball 19 closing the orifice passage 10, the rocker arm 36 swings and the intake and exhaust valves 324 move up and down without jerking. do. Therefore, that cylinder is activated and the required torque and horsepower are delivered.

Next, a case will be described in which the engine oil humidity drops below the set temperature, for example, 90° C., due to the rotational speed of the internal combustion valve becoming low again or the fuel being cut off for a long time.

In this case as well, the pause release member 24, which has been heated to the above, is immediately cooled down by the engine oil. The temperature of the pause release member 24 is ±0 from the set temperature, for example, 90°C.
．． When the temperature drops to within the range of 9° C., the shape memory alloy undergoes thermoelastic martensitic transformation to a low temperature phase, and loses the ability to maintain the set shape in the high temperature phase.

Therefore, the orifice passage 10 is opened again, and the cylinder becomes inactive with the intake and exhaust valves 32 remaining closed.

As described above, according to this embodiment, first, when large torque or horsepower is not required in the internal combustion engine, predetermined cylinders are deactivated to reduce the number of active cylinders, so fuel consumption can be significantly reduced. can.

In addition, since it is only necessary to install two springs 24 and 25 in the actuator body 23, its dimensions and shape are compact and simple, and the hydraulic lash adjuster 6
It is easy to incorporate into

Furthermore, since the hydraulic lash adjuster 6 does not become large or its air volume increases, there is no problem in the followability of the hydraulic lash adjuster 6 during high-speed rotation of the internal combustion engine.

Further, the basic mechanism for stopping is completely housed within the hydraulic lash adjuster 6, and the shape memory alloy of the stopping release member 24 senses the engine oil temperature and automatically operates. Therefore, ■There is no need for electrical wiring or switch systems as in conventional solenoid valve systems, ■There is no need for insulation, and ■Hydraulic rush for moving objects! ■ Hydraulic lash adjuster internal combustion 12! It is easy to assemble into the valve, (■ There is no electrical system and the structure is simple, so operational errors can be extremely reduced. ■ There is no problem of deterioration caused by engine oil that existed in the solenoid valve system 2, ■ Low This has the effect of reducing costs, etc.

Furthermore, in this embodiment, as described above, the pause release member 24
Since the bias spring 25 was used in combination with the shape memory alloy, the hysteresis width of the shape memory alloy could be kept within ±0.9°C. Therefore, since the stop release member 24 reversibly changes the set temperature of the shape memory alloy within a range of 0.9° C., it is possible to reversibly change the number of operating cylinders at a substantially constant temperature.

Second Embodiment Next, a second embodiment in which the present invention is embodied in an automobile internal combustion engine having the same OHV valve side will be described in Section 3.4.
This will be explained according to the diagram. This internal combustion engine is of a type in which a hydraulic lash adjuster is built into the bushing rod, and many of the configurations of this embodiment are the same as those of the first embodiment.

That is, a valve lifter 40 is inserted into the sleeve 5 so as to be movable, and its lower surface is in contact with the cam 2.

The lower end of a bushing rod 41 is brought into contact with the recess on the upper surface of the pulp lifter 40, and a hydraulic lash adjuster 42 is built into the tip of the bushing rod 41. This hydraulic lash adjuster 42 and the hydraulic lash adjuster 6 of the first embodiment have a protrusion 43 formed on the upper part of the plunger 8 that contacts the lower surface of the end of the rocker arm 36 instead of the seat 12, and the body 7. 1 of the protrusion 43 on the upper end of
This is true only at the point where the retaining member 44 is provided.

Therefore, the hydraulic lash adjuster 42 of the present embodiment has a different action from the hydraulic lash adjuster 1 of the first embodiment, except that its operating position is above and below the pusher 10. This is similar to star 6. Therefore, this embodiment also has the same effect as the first embodiment.

Third Embodiment Next, a third embodiment in which the present invention is embodied in an automobile internal combustion engine having 11 01@C valve structures will be described with reference to FIG. This internal combustion engine is of a type in which a hydraulic lash adjuster is provided at the fulcrum of the end of the rocker arm, and many of the configurations of this embodiment are the same as those of the first embodiment.

That is, the camshaft 3 to which the force 112 is fixed extends inside the cylinder head 31 . A rocker arm 45 is swingably supported directly below the cam 2, and the center portion of the upper surface of the rocker arm 45 is in contact with the cam 2. Further, a hydraulic lash adjuster 46 is attached to the cylinder head 31. Its structure is almost the same as the hydraulic lash adjuster 42 of the second embodiment, and the body 7 is fixed to the cylinder head 31. The protrusion 43 of the hydraulic lash adjuster 46 and the upper end of the intake/exhaust valve 32 are in contact with the lower surface of the end of the rocker arm 45, respectively. That is, the rocker arm 45 swings about the contact portion with the protrusion 43 of the hydraulic lash adjuster 46 as a fulcrum.

The operation of the hydraulic lash adjuster 46 of this embodiment will be explained. First, as mentioned above, when the engine oil temperature is relatively low (for example, about 80'C), the pause #I removing member 24
shape memory alloys are in the low temperature phase.

Therefore, the orifice passage 10 is released and the plunger 8
moves relatively downward within the body 7. At this point, since the body 7 is fixed to the cylinder head 31, the protrusion 43 of the plunger 8, which forms the fulcrum, descends. Therefore, the rocker arm 45 can no longer transmit the displacement of the cam 2 to the intake and exhaust valves 32, and the cylinder is
remains closed and inactive.

Next, when the temperature of the engine oil rises to within a range of ±0.9°C from the set temperature of 90°C, for example, the shape memory alloy reversely transforms to a high temperature phase, so the pause release member 24 closes the orifice passage 10. bias in the direction. Therefore, the protrusion 43 of the plunge V8 is raised until the rocker arm 45 and the intake/exhaust valve 32 are securely abutted without any clearance.
The cylinder becomes active.

The above action takes place reversibly. Therefore, this embodiment also has the same effects as the first embodiment.

Fourth Embodiment Next, a fourth embodiment in which the present invention is embodied in an automobile internal combustion engine having the same OHC valve structure will be described with reference to FIG. This internal combustion engine is of a type that uses both a rocker support and a hydraulic lash adjuster for pivotally supporting the central part of the A-tsuka-arm. This embodiment also has many of the same configurations as the first embodiment.

In other words, a rocker support/hydraulic lash adjuster 47 (simply referred to as a hydraulic lash adjuster in the wooden embodiment) is attached to the upper part of the cylinder head 31, and the main part of the structure is the same as in each of the embodiments described above. This is the same as the hydraulic lash adjuster 6.42°46.47. In the hydraulic lash adjuster 47, the upper end of the plunger 8 is fixed to the cylinder head 31, and the body 7 is slidable relative to the cylinder head 31.

A bracket 48 is attached to the lower end of the body 7, and a rocker arm 50 is rotatably supported by four rocker shafts inserted through the bracket 48. The cam 2 and the upper end of the intake/exhaust valve 32 are in contact with the lower surface of the end of the rocker arm 50, respectively.

The operation of the hydraulic lash adjuster 47 of this embodiment will be explained. First, when the temperature of the engine oil is relatively low as described above, the shape memory alloy of the pause release member 24 is in the low temperature phase, so the orifice passage 10 is opened and the plunger 8 and the body 7 move relative to each other. Here, plunger 8
is fixed to the cylinder head 31, so the bracket 48 supporting the rocker arm 50 is fixed to the cylinder head 31.
'A Riru.

Therefore, the rocker arm 50 is no longer able to transmit the displacement of the cam 2 to the intake and exhaust valves 32, and the cylinder remains inactive with the intake and exhaust valves 32 closed.

Next, when the temperature of the engine oil falls within the range of 10.9 degrees Celsius from the set temperature of 90 degrees Celsius, for example, the shape memory alloy of the stop release member 24 undergoes reverse transformation to the high temperature phase, and the rocker arm 50 The bracket 48 is lowered until the intake and exhaust valves 32 are brought into secure contact with each other without any clearance, and that cylinder is put into operation.

The above action takes place reversibly. Therefore, this embodiment also has the same effects as the first embodiment.

Fifth Embodiment Next, a fifth embodiment in which the present invention is embodied between an internal combustion line for an automobile having the same <0)-IC valve mechanism will be described as a seventh embodiment.
This will be explained according to the diagram. This internal combustion threshold is of a type in which a hydraulic lash adjuster is built into the rocker arm, and many of the configurations of this embodiment are the same as those of the first embodiment.

In this embodiment, a hydraulic lash adjuster 52 is attached to the end of the rocker arm 5, and the main part of the structure is the hydraulic lash adjuster 4 having the protrusion 43.
Same as 2.46. Hydraulic lash adjuster 52
In this case, the body 7 is fixed to the hydraulic lash adjuster 52, and the plunger 8 is movable downward.

The cam 2 is in contact with the lower surface of one end of the rocker arm 51,
The upper end of the intake/exhaust valve 32 is in contact with the protrusion 43 of the plunger 8 .

In this embodiment as well, the plunger 8 of the hydraulic lash adjuster 52 operates in the same manner as in each of the embodiments described above, so that the same effects as in the first embodiment are achieved.

It should be noted that the present invention is not limited to the configurations of the first to fifth embodiments, and can be embodied as follows, for example.

<1) A type of valve train that presses the center part of the upper surface of the rocker arm 45 with the cam 2 as in the third embodiment (at t, the intake and exhaust valve 3 of the rocker arm 51 as in the fifth embodiment)
A hydraulic lash adjuster shall be built into the end of the second side.

(2) The shape of the bias spring 25 is not limited to a coil spring shape, and may be changed to a plate spring or other shapes. Furthermore, instead of being provided in the actuator body 23 of the low pressure chamber 13, the bias spring 25 may be provided in the high pressure chamber 14 as a tension spring.

(3) The five-party regular shape of the pause release member 24 in the high temperature phase is not limited to an extended coil spring shape, but may also be changed to a gently curved shape, an extended zigzag shape, or a pond thereof.

Further, the pause release member 24 can also be provided in the high pressure chamber 14 instead of being provided in the actuator main body 23 of the low pressure chamber 13. In this case, in the high temperature phase of the weight release member 24, 15
The set shape may be a compressed coil spring shape, an extremely curved shape, a compressed zigzag shape, or any other shape, and may be expanded by the bias spring 25 in the low temperature phase.

(4) In addition to internal combustion engines for automobiles, it can also be embodied in internal combustion engines for various weighing applications. In this case, the pause release member 2
The set temperature No. 4 can be arbitrarily determined by taking into account the engine temperature, required torque, required horsepower, fuel consumption, etc. during normal operation of the internal combustion engine.

Effects of the Invention As detailed above, the present invention provides the following effects.

First, when large torque or horsepower is not required for internal combustion Ia, predetermined cylinders are deactivated to reduce the number of active cylinders, so fuel consumption m can be significantly reduced.

Also, the check ball actuator means and its release means are compact and simple, making it easy to integrate into the hydraulic lash adjuster. Furthermore, since the hydraulic lash adjuster does not become large or lff1 increases, there is no problem in the followability of the hydraulic lash adjuster when the internal combustion engine rotates at high speed.

In addition, unlike conventional solenoid valve systems, there is no need for electrical wiring or switch systems, there is no need for insulation, it is easy to assemble the internal combustion engine of the hydraulic lash agitator, and the structure is simple as there is no electrical system. Therefore, it is possible to reduce the number of operational errors by 1", there is no problem of deterioration caused by the engine oil present in the solenoid valve device, and there is also the effect of reducing costs.

Furthermore, the stop lysis width of the stop release section H can be kept low, and the number of activated cylinders can be reversibly switched at a substantially constant rate.

[Brief explanation of the drawing]

Figures 1 and 2 show a first embodiment of the present invention in an internal combustion chamber for an automobile located on the right side of an OI-I V valve mechanism, and Figure 1 is a sectional view showing a hydraulic lash adjuster thereof.
Figure 2 is a sectional view showing the entire valve train gM 4M with a stop function.
Figures 3 and 4 show a self-contained valve having an OHC valve mechanism according to the present invention. l
J-width internal combustion (shows a second embodiment embodied in the interlayer, FIG. 3 is a sectional view showing the entire body stop function fNJ valve mechanism,
FIG. 4 is a cross-sectional view showing a hydraulic lash adjuster, FIG. )
FIG. 7 is a sectional view of essential parts showing the fifth embodiment (OHC valve mechanism). 6.42, 46.47.52... Hydraulic lash adjuster, 8... Plunger, 10... Orifice passage, 13... Low pressure to, 14... High pressure chamber, check ball, 24... Pause release member, 25...bias spring. Patent Applicant: Odai Tekko Co., Ltd. Agent: Patent Attorney 1) Its Declaration Figure 1 Figure 4 Figure 61!1

Claims (1)

[Claims] 1. In a valve train in an internal combustion engine having a hydraulic lash adjuster, the hydraulic lash adjuster (6, 4) is controlled by a plunger (8) having an orifice passage (10).
2, 46, 47, 52), a high pressure chamber (14) and a low pressure chamber (
13) and a check ball (19) for opening and closing the orifice passage (10) in the high pressure chamber (14).
and hydraulic lash adjusters (6, 42, 46,
A bias elastic member (25) as an actuator means for the check ball (19) is provided in the check ball (19), and a pause release member (24) is provided as a release means for the actuator means. ) made of a shape memory alloy designed to restore the shape of the high temperature phase at a predetermined temperature. 2. The bias elastic member (25) is a coil spring made of steel material.
) is a push rod (21) connected to a check ball (19).
2. The valve mechanism with a stop function for an internal combustion engine according to claim 1, wherein the valve mechanism is arranged to press the check ball (19) through a valve. 3. The set shape of the pause release member (24) in the high temperature phase is an elongated coil shape, and in the low temperature phase, it is compressed by the bias elastic member (25). A valve mechanism with a shutdown function in the internal combustion engine described above. 4. Bias elastic member (25) and pause release member (24)
) is disposed within an actuator main body (23) provided within a low pressure chamber (13), the valve operating mechanism with a pause function for an internal combustion engine according to claim 3. 5. The shape-recovery temperature of the shape memory alloy that is the material of the suspension release member (24) is set to an arbitrary temperature of 80° C. or higher. A valve mechanism with a stop function in an internal combustion engine.