JPH0768893B2 - Valve operating state switching detection device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Use The present invention controls valve operation state switching means capable of switching the operation state of an engine valve and operation of the valve operation state switching means. The control means, the monitor oil passage configured to change the oil pressure in response to the switching of the operating state of the engine valve by the valve operating state switching means, and the oil pressure of the monitor oil passage to detect the switching of the operating state of the engine valve And a hydraulic pressure detector for inputting to the control means.

(2) Conventional Technology Conventionally, such a device is already known, for example, from Japanese Patent Laid-Open No. 63-14909.

(3) Problems to be Solved by the Invention By the way, in such a device, the switching operation of the valve operation state switching means, that is, the operation state switching of the engine valve is performed in accordance with the detection value of the oil pressure detector that detects the oil pressure in the monitor oil passage. When it is determined whether the switching is normally performed and the control means determines that the switching is abnormal, an alarm lamp or the like is used to notify that the switching is abnormal.

However, when the engine temperature is low and the oil viscosity is high, or when the engine speed is low and the oil pressure in the monitor oil passage is not high enough, if the switching oil pressure is judged to be abnormal, the switching will be normal. However, there is a possibility that it may be erroneously determined to be abnormal though it is being performed.

In view of the above circumstances, a first object of the present invention is to detect a valve operating state switching of an internal combustion engine, which prevents erroneous determination that switching is abnormal despite normal switching. It is to provide a device.

Further, in the above conventional one (JP-A-63-147909),
It is possible to move between a plurality of driving members that are adjacent to each other for driving the engine valve to open and close according to the rotational operation of the cam, between a position where the driving members that are adjacent to each other are connected and a position where the connection is released. When the valve opening state switching means having a different connection switching member is provided, the drive member is provided with a circular opening capable of switching between connection and disconnection with the monitor oil passage by movement of the connection switching member, and when the opening is opened. Whether or not the switching operation is normally performed is determined by the decrease in the oil pressure in the monitor oil passage and the increase in the oil pressure in the monitor oil passage when the opening is closed by the connection switching member. However,
Since the opening is circular, the movement stroke of the connection switching member between the position where the opening is completely opened and the position where the opening is completely blocked becomes relatively large, and therefore the switching due to the change in the hydraulic pressure of the monitor oil passage. It cannot be said that the detection response is excellent.

In view of the above circumstances, a second object of the present invention is to provide a valve operating state switching detection device for an internal combustion engine, which has improved switching detection responsiveness.

Further, in the above-mentioned conventional one (Japanese Patent Laid-Open No. 63-147909), by opening / closing a single monitor oil passage in accordance with movement of a plurality of connection switching members, that is, in accordance with a change in operating state of an engine valve. , The operating state is detected.
Therefore, in order to reliably detect the switching of the operating state, a plurality of monitor oil passages for exclusively detecting the movement of the plurality of connection switching members are provided, and the operating state switching is judged by these monitor oil passages. It is desirable to do. However, if the oil from the oil supply source is constantly supplied to each dedicated monitor oil passage, the amount of oil used increases.

In view of the above circumstances, a third object of the present invention is to provide a valve operating state switching detecting device for an internal combustion engine, which can surely detect the operating state switching while reducing the amount of oil used. .

B. Structure of the Invention (1) Means for Solving the Problems According to the first feature of the present invention in order to achieve the first object, the control means includes a temperature detector for detecting the engine temperature, And at least one of the rotation speed detectors for detecting the engine rotation speed is connected, and the control means establishes at least one of a state in which the engine temperature is equal to or lower than a predetermined temperature and a state in which the engine speed is equal to or lower than the predetermined rotation speed. Is configured to stop the determination of switching of the operating state of the engine valve based on the detection value of the oil pressure detector.

Further, according to the second aspect of the present invention for achieving the above second object, the rotation operation of the cam is provided between the cam and the engine valve provided on the cam shaft that is interlocked and connected to the crankshaft. Accordingly, a plurality of drive members adjacent to each other for opening and closing the engine valve are provided so as to be relatively displaceable,
The valve operating state switching means has a connection switching member movable between a position for connecting the drive members adjacent to each other and a position for releasing the connection, and is provided between the drive members. A slit-shaped opening extending in a direction orthogonal to the moving direction of the member is provided in at least one of the drive members so as to switch communication / disconnection with the monitor oil passage according to the movement of the connection switching member.

Further, according to the third feature of the present invention for achieving the above-mentioned third object, the rotational operation of the cam is provided between the cam and the engine valve provided on the camshaft which is interlocked with and connected to the crankshaft. Accordingly, a plurality of mutually adjacent drive members for driving the opening / closing of the engine valve are provided so as to be relatively displaceable, and the valve operating state switching means connects a position for connecting the mutually adjacent drive members and its connection. A plurality of connection switching members that are movable between the release position and the drive members are provided between the driving members. A plurality of monitor oil passages that can be individually switched between open and closed in other operating states are connected to a single oil supply source via a switching valve.

(2) Operation According to the configuration of the first feature, the operation state switching of the engine valve is performed when at least one of the state in which the engine temperature is equal to or lower than the predetermined temperature and the state in which the engine speed is equal to or lower than the predetermined speed are satisfied. The determination is stopped, which prevents an erroneous determination due to the oil pressure in the monitor oil passage not being sufficiently high due to the high oil viscosity or the low engine speed.

Further, according to the configuration of the second feature, since the opening provided in the drive member is a slit shape extending in the direction orthogonal to the moving direction of the connection switching member, the position where the opening is completely opened and the position where the opening is completely opened are completely formed. The movement stroke of the connection switching member between the position where the connection is cut off is relatively small.

Further, according to the configuration of the third feature, it is possible to reliably determine the operating state of each connection switching member, that is, the operating state of the engine valve, by the plurality of monitor oil passages having the oil pressures individually corresponding to the operating state of the engine valve. Is possible, and the connection state between the oil supply source and each monitor oil passage is switched by the switching valve.
It is possible to reduce the amount of oil used.

(3) Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

First, in FIG. 1 to FIG. 3, each cylinder of the cylinder head 1 in the DOHC type multi-cylinder internal combustion engine is provided with a pair of intake valve openings 3 _A and 3 _B that open toward the top of the combustion chamber 2. And a pair of intake valves V _IA and V _IB as engine valves that can individually open and close the intake valve openings 3 _A and 3 _B are the cylinder head 1
Is supported so that it can be opened and closed. Thus, the intake valve V of each cylinder
_IA , V _IB are 1 from the engine crankshaft (not shown)
A camshaft 4 that is driven to rotate at a reduction ratio of / 2, low-speed cams 5 and 5 and high-speed cam 6 that are integrally provided on the camshaft 4, and a rocker shaft 7 that is fixedly arranged in parallel with the camshaft 4. And a first drive rocker arm 8, a second drive rocker arm 9 and a free rocker arm 10 as drive members pivotally supported by the rocker shaft 7, and valve operating state switching means 11 provided between the rocker arms 8, 9, 10. It is driven to open and close by the intake valve side valve operating device 12 _I.

The cam shaft 4 is arranged above the cylinder head 1 so as to be rotatable about its axis in parallel with the arrangement direction of each cylinder. Further, the low speed cams 5 and 5 having a shape corresponding to the low speed operation of the engine are integrated with the cam shaft 4 at the positions corresponding to the intake valves V _IA and V _IB, and the high speed corresponding to the high speed operation of the engine. The cam 6 is integrated with the camshaft 4 between the low speed cams 5, 5. On the other hand, the rocker shaft 7 is fixedly disposed below the cam shaft 4 and has an axis parallel to the cam shaft 4. The rocker shaft 7 has a first drive rocker arm 8 linked to and linked to one intake valve V _IA , a second drive rocker arm 9 linked to and linked to another intake valve V _IB , and first and second Free rocker arms 10 arranged between the drive rocker arms 8 and 9 are pivoted adjacent to each other.

Cam slippers 13 and 14 slidably contacting the low speed cams 5 and 5, respectively, are provided on the upper portions of the first and second drive rocker arms 8 and 9, and a cam slipper 15 slidably contacting the high speed cam 6 is provided on the free rocker arm 10. Is provided.

Tappet screw 1 for the first and second drive rocker arms 8 and 9
6 are screwed so that each can move forward and backward. Meanwhile, each intake valve
V _IA and V _IB are valve springs 17 compressed between the cylinder head 1 and
Are respectively elastically urged in the upward direction, that is, in the valve closing direction, and the intake valves V _IA and V _IB corresponding to the tappet screws 16 respectively.
Abut on the upper end of. As a result, both drive rocker arm 8,
9 will be linked and connected to the intake valves V _IA and V _IB individually.

Further, the free rocker arm 10 is elastically urged in a direction in which the cam slipper 15 is slidably brought into contact with the high speed cam 6 by the lost motion mechanism 18 which is interposed between the free rocker arm 10 and the cylinder head 1. This lost motion mechanism 18 has a bottomed cylindrical guide member 19 fitted into the cylinder head 1 with its closed end facing the cylinder head 1, and a free rocker arm fitted slidably into the guide member 19. A piston 20 that abuts the lower surface of 10 and first and second springs 21 and 22 that are interposed in series between the piston 20 and the guide member 19 to bias the piston 20 toward the free rocker arm 10; The first and second springs 21 and 22 are set such that their spring constants are different from each other.

In FIG. 4, the valve operating state switching means 11 includes a connection switching piston 25 as a first connection switching member capable of connecting the first drive rocker arm 8 and the free rocker arm 10, the free rocker arm 10 and the second drive rocker arm 9. A cylindrical connection switching pin 26 serving as a second connection switching member capable of connecting between the third and third connection switching pins 25 and a third drive locker arm 9 fitted to the second drive rocker arm 9 for restricting the movement of the connection switching pin 26. A cylindrical stopper 27 with a bottom as a connection switching member
And a return spring 28 for urging the connection switching piston 25, the connection switching pin 26, and the stopper 27 toward the connection release side.

The first drive rocker arm 8 is provided with a bottomed first guide hole 29 opened to the free rocker arm 10 side in parallel with the rocker shaft 7, and the connection switching piston 25 can slide in the first guide hole 29. And a hydraulic chamber 32 is defined between one end of the connection switching piston 25 and the closed end of the first guide hole 29.

A guide hole 30 corresponding to the first guide hole 29 is formed in the free rocker arm 10 in parallel with the rocker shaft 7 between both side surfaces, and one end of the connection switching piston 25 is brought into contact with the other end of the connection switching piston 25. The switching pin 26 is slidably fitted in the guide hole 30.

A second bottomed second guide hole 31 corresponding to the guide hole 30 is formed in the second drive rocker arm 9 in parallel with the rocker shaft 7 by opening to the free rocker arm 10 side. A stopper 27 having a bottomed cylindrical shape that abuts the closed end with the end is slidably fitted in the second guide hole 31. The return spring 28 is contracted between the closed end of the second guide hole 31 and the closed end of the stopper 27, and the connection switching piston 25 and the connection switching pin 25 that abut against each other by the spring force of the return spring 28.
26 and the stopper 27 are urged toward the hydraulic chamber 32. Moreover, a release hole 33 for removing air and oil is provided at the closed end of the second guide hole 31, and a connection switching pin is provided at the closed end of the stopper 27.
A communication hole 34 communicating with the inside of 27 is formed.

In the valve operating state switching means 11, when the hydraulic pressure in the hydraulic chamber 32 is low, as shown in FIG. 4, the spring force of the return spring 28 causes the connection switching piston 25 to move the contact surface with the connection switching pin 26 to the first contact surface. The position is set to correspond between the 1-drive rocker arm 8 and the free rocker arm 10, and the connection switching pin 26 is stopped by the stopper 27.
Since the contact surface of the rocker arm and the second drive rocker arm 9 correspond to each other,
The coupled state of 8, 9 and 10 is released, and the rocker arms 8 to 10 are in a relatively displaceable state. Therefore, both intake valves V _IA , V
_{The IB} is driven to open and close by the first and second drive rocker arms 8 and 9 which are rockably driven by the low speed cams 5 and 5.
When the hydraulic pressure in the hydraulic chamber 32 increases, the connection switching piston 25 fits into the guide hole 30 and the connection switching piston 26 fits into the second guide hole 31 as shown in FIG. 10 are connected. Therefore, the first and second drive rocker arms 8 and 9 swing together with the free rocker arm 10 that is swing-driven by the high speed cam 6, and both intake valves V _IA and V
_{The IB} is driven to open and close by the high speed cam 6.

By the way, the inside of the rocker shaft 7 is divided into an oil supply passage 36, a high speed state detection oil passage 37, and a low speed state detection oil passage 38 by a substantially T-shaped partition wall 35. For the partition wall 35, a substantially T-shaped separator is inserted in the hollow cylindrical rocker shaft 7, and the separator and the inner surface of the rocker shaft 7 are welded or bonded by electron beam welding or the like. Alternatively, the separator may be formed by press-fitting the separator into the rocker shaft 7, and the hollow shaft and the separator may be integrally drawn to form the partition wall 35 in the rocker shaft 7. You may Moreover, the portion of the bulkhead 35 having a substantially T-shape extending over the diameter of the rocker shaft 7 is arranged so that the rocker shaft 7 coincides with the direction in which the rocker shafts 8, 9 and 10 receive the maximum load by the rocking operation of the rocker arms 8, 9, 10. As a result, the rigidity of the rocker shaft 7 can be improved and the outer diameter of the rocker shaft 7 can be made relatively small.

Hydraulic passage 36 are respectively communicated with the hydraulic chamber 32 of the valve operation state switching means 11 at the intake valve side valve operating device 12 _I of each cylinder.
That is, the first drive rocker arm 8 is provided with an annular groove 39 surrounding the rocker shaft 7 and an oil passage 40 communicating the annular groove 39 with the hydraulic chamber 32. The rocker shaft 7 is provided with an oil supply passage 36. A communication hole 41 communicating with the annular groove 39 is formed. Therefore, the oil supply passage 36 is always in communication with the hydraulic chamber 32 regardless of the swinging state of the first drive rocker arm 8.

An annular recess 42 is provided on the outer periphery of the stopper 27 in the valve operating state switching means 11. On the other hand, in a portion of the second drive rocker arm 9 facing the sliding contact portion with the low speed cam 5, that is, in the upper portion of the second drive rocker arm 9 and the cam slipper 14, a slit-shaped opening which is long in the direction orthogonal to the moving direction of the stopper 27 is formed. 43 is provided so that the inner surface of the second guide hole 31 communicates with the outside, and the opening 43 forms an oil reservoir 44 that becomes narrower as it gets deeper. Moreover, the opening 43 is communicated with the annular recess 42 when the stopper 27 is in the connection release position as shown in FIG. 4, and is closed by the stopper 27 when it is in the connection position as shown in FIG. Is located in.

A high-speed state detecting monitor oil passage 45 is formed between the high-speed state detecting oil passage 37 in the rocker shaft 7 and the opening portion 43 by the stopper 27 for switching between communication and interruption. That is, the second rocker arm 9 is provided with an annular groove 46 surrounding the rocker shaft 7 and a communication passage 47 for communicating the annular groove 46 with the annular recess 42 regardless of the movement position of the stopper 27. High-speed condition detection oil passage 37
Is communicated with the annular groove 46 through a communication hole 48, and a high-speed state detection monitor that reaches the opening 43 from the high-speed state detection oil passage 37 through the communication hole 48, the annular groove 46, the communication passage 47, and the annular recess 42 is formed. The oil passage 45 is formed. This high-speed condition monitor oil passage 45
Means that the stopper 27 is in the connected position, that is, both intake valves
While V _IA and V _IB are in the closed state when the vehicle is in the fast-forwarding state, the stopper 27 is in the disconnecting position, that is, when the intake valves V _IA and V _IB are in the low-speed operating state, the opening is opened.
It will be opened to the outside from 43.

An annular recess 51 is provided on the outer periphery of the connection switching pin 26 in the valve operating state switching means 11. Meanwhile, Free Rocker Arm 10
Of the free rocker arm 10 and the cam slippers 15 facing the sliding contact portion with the high speed rocker arm 6 of
A slit-shaped opening 52 long in the direction orthogonal to the movement direction of the connection switching pin 26 is provided so that the inner surface of the guide hole 30 communicates with the outside, and the opening 52 becomes narrower as it becomes deeper. The oil sump 53 is formed. Moreover, the opening 52 is
When the connection switching pin 26 is in the connection releasing position as shown in FIG. 4, it is closed by the connection switching pin 26, and when it is in the connection position as shown in FIG. 5, it is arranged so as to communicate with the annular recess 51. .

Between the low speed state detecting oil passage 38 in the rocker shaft 7 and the opening portion 51, a low speed state detecting monitor oil passage 54 for switching communication / disconnection by the connection switching pin 26 is formed. That is, the free rocker arm 10 has an annular groove 55 surrounding the rocker shaft 7 and a communication passage for communicating the annular groove 55 with the annular recess 51 regardless of the movement position of the connection switching pin 26.
56, a rocker shaft 7 is provided with a communication hole 57 for communicating the low speed state detection oil passage 38 with the annular groove 55. The low speed state detection oil passage 38 is communicated with the communication hole 57, the annular groove 55, and the communication hole 57. Aisle 56
Also, a low-speed state detection monitor oil passage 54 is formed which reaches the opening 52 through the annular recess 51. The monitor oil passage 54 for detecting the low speed state is opened from the opening 51 to the outside when the connection switching pin 26 is in the connection position, that is, when both intake valves V _IA and V _IB are in the high speed operation state. On the other hand, when the connection switching pin 26 is in the connection release position, that is, when both intake valves V _IA and V _IB are in the low speed operation state, the connection switching pin 26 is in the closed state.

In FIG. 6, an exhaust valve side valve operating device 12 _E for opening / closing driving exhaust valves V _EA and V _EB as engine valves arranged in pairs in each cylinder is the intake valve side valve operating device 12 described above. _Since it has basically the same configuration as _I , and the parts related to both valve trains 12 _I and 12 _E are basically the same in the oil supply system described below, the intake valve side valve drive will be described below. Only the oil supply system of the device 12 _I will be described, and the description of the oil supply system of the exhaust valve side valve operating device 12 _E will be omitted.

The oil supply source 62 includes an oil pan 63, an oil pump 64 that pumps oil from the oil pan 63, and a relief valve 65 that is connected to a discharge port of the oil pump 64. This oil source
62 is connected to an oil gallery 68 via an oil filter 66 and an oil cooler 67.

A control valve 70 is connected to the oil gallery 68 for switching the oil passing through a filter 69 provided in the middle thereof to a high pressure or a low pressure and supplying the oil to the oil supply passage 36. Also the filter 69
Oil passage 72 having a middle diaphragm 71 as well as branched from the oil gallery 68 on the upstream side than the, in each cylinder valve operating system 12 _I
Lubricating oil passage for guiding lubricating oil to the sliding contact portions of each rocker arm 8-10 with the low speed cams 5, 5 and the high speed cam 6
Connected to 73. Further, the oil passage 73 is connected to the camshaft 4
Lubricating oil passages 74 for guiding lubricating oil to the journal part of
Connected to.

The oil passage 72 is connected to the input port 78 of the switching valve 75. The oil passage 72 is connected to the high-speed state detecting monitor oil passage 45 via the first output port 79 of the switching valve 75 and the throttle 76, and the second output port 80 is Aperture 77
Is connected to the monitor oil passage 54 for low speed state detection via. The switching valve 75 has a housing 81 having the input port 78, the first output port 79 and the second output port 80, and a position where the input port 78 and the first output port 79 are communicated with each other. The spool 82 is fitted so as to be slidable with respect to the position where the output port 80 communicates. That is, the spool 82 has one end and the housing 81.
A pilot hydraulic chamber 83 communicating with the oil supply passage 36 is formed between the first end and the housing 81, and a spring chamber 84 open to the atmosphere is formed between the other end and the housing 81 so as to be slidably fitted in the housing 81 and A return spring 85 for urging the spool 82 in the direction of contracting the volume of the pilot hydraulic chamber 83 is housed in the chamber 84.

In the switching valve 75, the spool 82 resists the spring force of the return spring 85 when the intake valve side valve operating device 12 _I is brought into a high-speed operation state, that is, when the hydraulic pressure of the oil supply passage 36 is increased by the control valve 70. Then, the input port 78 is moved to a position where it communicates with the first output port 79, and when the intake valve side valve operating device 12 _I is brought into a low speed operation state, that is, the hydraulic pressure of the oil supply passage 36 is lowered by the control valve 70. At this time, the spool 82 moves to a position where the input port 78 communicates with the second output port 80 by the spring force of the return spring 85. Therefore, in the high speed operation state, the oil from the oil supply source 62 is supplied to the high speed state detecting monitor oil passage 45 through the throttles 71, 76, and in the low speed working state, the oil from the oil supply source 62 is throttled 71, 77. Monitor oil passage 5 for low speed detection via
Will be supplied to 4.

The operation of the control valve 70 is controlled by the control means 86, and the control means 86 changes the operation of the control valve 70 between the high-speed working state and the low-speed working state in response to the input of the index representing the operating state of the engine. To switch and control. Moreover, the control means 86 includes
A high-speed state oil pressure detector 87 that detects the oil pressure of the high-speed state detection monitor oil passage 45 and a low-speed state detector 88 that detects the oil pressure of the low-speed state detection monitor oil passage 54 are connected. Control means 86 according to the detection values of the oil pressure detectors 87, 88
Is the valve operating state switching means 1 in the intake valve side valve operating device 12 _I.
Determine whether the operation of 1 is normal. That is, when the operation of the valve operating state switching means 11 is normal, the high-speed state detection monitor oil passage 45 is closed during high-speed operation, so that the oil from the oil supply source 62 is supplied through the switching valve 75. Therefore, the low speed state monitor oil passage 54 is open to the outside and is cut off from the oil supply source 62 by the switching valve 75, so that the atmospheric pressure is obtained.
During low-speed operation, the low-speed state detection monitor oil passage 54 is closed, so that the oil from the oil supply source 62 is supplied through the switching valve 75 to have a relatively high pressure, whereas the high-speed state detection monitor is used. Since the oil passage 45 is opened to the outside and is cut off from the oil supply source 62 by the switching valve 75, it is at atmospheric pressure, and the detection pressures of both the hydraulic pressure detectors 87 and 88 are as shown in Table 1 below. When it is, it can be determined that the switching operation is normal, when it is different from the state shown in Table 1, it can be determined that the switching operation is abnormal, and when it is determined that it is abnormal, The control means 86 gives notification by means of an alarm lamp or the like.

Meanwhile, the control unit 86, a temperature detector 89 for detecting the engine temperature T _E, which is connected to the rotational speed detector 90 for detecting the engine speed N _E, the control means 86, mechanical temperature T _E Is lower than a predetermined temperature and / or the engine speed N _E is lower than a predetermined speed, at least one of the two conditions is satisfied. It

Explaining the operation in this embodiment, the control means 86 controls the operation of the control valve 70 in accordance with the operating state of the engine, so that the valve operating state switching means 11 performs the switching operation, and in the high speed operating state of the engine. The rocker arms 8 to 10 are integrally connected, and both intake valves V _IA and V _IB are driven to open and close at opening and closing timings and lift amounts according to the shape of the high-speed cam 6, and when the engine is operating at low speed, the rocker arms 8 to 10 are connected. 10 relative displacements are allowed, and V _IA and V _IB are opened and closed at the opening and closing timing and the lift amount according to the shape of the low speed cams 5,5.

By the way, since the detection values of both hydraulic pressure detectors 87 and 88 change as shown in Table 1 above in the high speed operation state of the engine and the low speed operation state of the engine, Based on the combination, the control means 86 can determine whether the operation of the connection switching pin 26 and the stopper 27, that is, the switching operation of the valve operating state switching means 11 is normal. Therefore, even if one of the connection switching pin 26 and the stopper 27 is normally switched, the other operation may be abnormal, and the high-speed state detection monitor oil passage 45 corresponding to the stopper 27 and the connection switching are connected. By detecting the hydraulic pressures of the low-speed-state detecting Senita oil passage 54 corresponding to the pin 26, respectively, the switching operation state of the valve operation state switching means 11 can be detected more reliably.

Moreover, the supply state of the oil from the oil supply source 62 to both monitor oil passages 45 and 54 is switched and controlled by the switching valve 75, and both monitor oil passages 4
Since the oil is supplied to the closed side of 5,54 and the oil is cut off to the side opened to the outside, the oil supply amount from the single oil supply source 62 is the minimum required. The oil supply source 62 can be prevented from increasing in size.

In addition, the opening 52 which is the end of the low speed state monitor oil passage 54 faces the sliding contact portion of the free rocker arm 10 with the high speed cam 6 to which a relatively large load acts in the high speed operation state of the engine.
An opening that is open when the engine is operating at high speed
Oil flows out from the oil reservoir 53 into the oil sump 53, and a relatively large load is applied to the second drive rocker arm 9 in the low speed operation state of the engine. An opening 43, which is the end of 45, is provided, and oil flows out from the opening 43 in the open state to the oil sump 44 during low-speed operation of the engine, so that each rocker arm 8-9 and each cam from the lubricating oil passage 73. Five,
The amount of lubricating oil to be supplied to the sliding contact portion with 5, 6 can be reduced, which can contribute to downsizing of the hydraulic pressure supply source 62.

The openings 43 and 52 are provided with the stopper 27 and the connection switching pin 26.
Since it is formed in a slit shape orthogonal to the moving direction of, compared to the conventional one that was formed in a circle by a drill etc., when the opening area is the same, those openings 43, 52 are completely The movement strokes of the stopper 27 and the connection switching pin 26 between the open position and the completely closed position can be reduced, and therefore both monitor oil passages 45, 54 during the switching operation of the valve operating state switching means 11 can be reduced.
This makes it possible to rapidly change the hydraulic pressure and improve the switching detection responsiveness.

Further, the control means 86, when at least one of the machine temperature T _E detected by the temperature detector 89 and the engine speed N _E detected by the rotation speed detector 90 is equal to or less than a predetermined value,
Since the operation switching state is not judged, the machine temperature T _E is low and the oil viscosity is high, or the engine speed N _E is low and the oil pressure in both monitor oil passages 45 and 54 is not sufficiently high. By avoiding the switching judgment, the oil viscosity is too low, or the oil pressure in both monitor oil passages 45 and 54 does not increase sufficiently. In the above embodiment, it is possible to prevent erroneous determination that there is a detection value of the temperature detector 89 and the rotation speed detector 90 to the control means 86, but only one of the detection values The switching determination may be stopped by.

C. Effect of the Invention As described above, according to the first feature of the present invention, the engine is operated when at least one of the state where the engine temperature is equal to or lower than the predetermined temperature and the state where the engine speed is equal to or lower than the predetermined speed are established. Surely prevent erroneous judgments due to the fact that the valve operating state switching judgment is stopped and the oil pressure in the monitor oil passage is not high enough due to high oil viscosity or low engine speed. To be done.

Further, according to the second aspect of the present invention, since the opening has a slit shape extending in the direction orthogonal to the moving direction of the connection switching member, the opening is completely open and the position is completely closed. It is possible to improve the detection response by making the movement stroke of the connection switching unit relatively small.

Furthermore, according to the third aspect of the present invention, the operating states of the plurality of connection switching members are respectively detected by the plurality of monitor oil passages, and thereby the operating state of the valve operating state switching means can be reliably determined. Moreover, since the connection state between the oil supply source and each monitor oil passage is switched by the switching valve, the amount of oil used can be reduced and the oil supply source can be downsized.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view of an intake valve side valve operating device, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is FIG. III-III line sectional view of FIG. 4, FIG. 4 is a sectional view taken along line IV-IV of FIG. 2 in a low speed operating state, FIG. 5 is a sectional view corresponding to FIG. 4 in a high speed operating state, and FIG. It is a figure which shows the oil supply system relevant to a valve device. 4 ... Cam shaft, 5 ... Low speed cam, 6 ... High speed cam, 8 ... First driving rocker arm as a driving member,
9 ... The second drive rocker arm as a drive member, 10 ...
Free rocker arm as driving member, 11 ... Valve operating state switching means, 25 ... Connection switching piston as connection switching member, 26 ... Connection switching pin as connection switching member, 27 ...
Stoppers as connection switching members, 43, 52 ... Openings, 44,
53 …… Oil sump, 45 …… Monitor oil passage for high-speed condition detection, 54 ……
Monitor oil passage for low speed state detection, 62 ... Oil supply source, 75 ... Switching valve, 86 ... Control means, 87, 88 ... Oil pressure detector, 89 ...
Temperature detector, 90 ... Revolution detector V _IA , V _IB ... Intake valve as engine valve, V _EA , V _EB ... Exhaust valve as engine valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigemasa Kajiwara 1-4-1, Chuo, Wako-shi, Saitama Prefecture Honda R & D Co., Ltd. (72) Inventor Ken Oya 1-4-1, Chuo, Wako-shi, Saitama (56) References JP-A-64-3215 (JP, A) JP-A-63-147809 (JP, A)

Claims (4)

[Claims] 1. A valve operating state switching means capable of switching the operating state of an engine valve, a control means for controlling the operation of the valve operating state switching means, and an operating state switching of the engine valve by the valve operating state switching means. A monitor oil passage configured to change the oil pressure,
In a valve operating state switching detecting device for an internal combustion engine, which includes a hydraulic pressure detector that detects the hydraulic pressure of the monitor oil passage and inputs the hydraulic pressure to the control means to detect switching of the operating state of the engine valve, the control means (86) includes At least one of a temperature detector (89) for detecting the engine temperature and a rotation speed detector (90) for detecting the engine speed is connected, and the control means (86) controls the condition that the engine temperature is equal to or lower than a predetermined temperature. When at least one of the states where the engine speed is less than or equal to the predetermined speed is established, the engine valves (V _IA , V _IB ,
A valve operating state switching detecting device for an internal combustion engine, which is configured to stop the determination of operating state switching of V _EA , V _EB ). 2. A valve operating state switching means capable of switching the operating state of an engine valve, a control means for controlling the operation of the valve operating state switching means, and an operating state switching of the engine valve by the valve operating state switching means. A monitor oil passage configured to change the oil pressure,
In a valve operating state switching detecting device for an internal combustion engine, which is equipped with a hydraulic pressure detector for detecting the hydraulic pressure of the monitor oil passage and inputting it to the control means in order to detect switching of the operating state of the engine valve, Between the cams (5, 6) provided on the camshaft (4) and the engine valves (V _IA , V _IB , V _EA , V _EB ), the engine valves are operated depending on the rotational operation of the cams (5, 6). (V _IA ,
A plurality of driving members (8, 9, 10) adjacent to each other for driving the opening and closing of V _IB , V _EA , V _EB ) are provided so as to be relatively displaceable, and the valve operating state switching means (11) is Each drive member (25, 26, 27) has a connection switching member (25, 26, 27) movable between a position for connecting the drive members (8, 9, 10) adjacent to each other and a position for releasing the connection. 8, 9 and 10) and slit-shaped openings (43, 52) extending in the direction orthogonal to the moving direction of the connection switching members (25, 26, 27) are connected to the connection switching members (25, 26, 27). 2
7) Valve actuation of an internal combustion engine, characterized in that it is provided in at least one of the drive members (8, 9, 10) for switching communication / shutoff with the monitor oil passage (45, 54) according to movement of 7). State switching detection device. 3. The drive member (9, 10) is formed with the opening (43, 52) so as to face the sliding contact portion with the cam (5, 6) and form an oil reservoir (44, 53). A valve operating state switching detection device for an internal combustion engine according to item (2). 4. A valve operating state switching means capable of switching the operating state of an engine valve, a control means for controlling the operation of the valve operating state switching means, and an operating state switching of the engine valve by the valve operating state switching means. A monitor oil passage configured to change the oil pressure,
A valve operating state switching detection device for an internal combustion engine, comprising a hydraulic pressure detector for detecting the hydraulic pressure of the monitor oil passage and inputting the hydraulic pressure to a control means in order to detect the operating state of an engine valve. Between the cams (5, 6) provided on the shaft (4) and the engine valves (V _IA , V _IB , V _EA , V _EB ), the engine valves ( V _IA ,
A plurality of driving members (8, 9, 10) adjacent to each other for driving the opening and closing of V _IB , V _EA , V _EB ) are provided so as to be relatively displaceable, and the valve operating state switching means (11) is A plurality of connection switching members (25, 26, 26) movable between a position for connecting the driving members (8, 9, 10) adjacent to each other and a position for releasing the connection.
27) is provided between the drive members (8, 9, 10), and the engine valve is formed by a plurality of connection switching members (26, 27) selected from the connection switching members (25, 26, 27). (V _IA , V _IB , V _EA ,
V _EB ) Multiple monitor channels (45,54) that can be individually switched between open in one operating state and closed in another operating state
Is connected to a single oil supply source (62) via a switching valve (75).