JPS63150407A - Cylinder number control device for rotary valve engine - Google Patents

Abstract

PURPOSE:To control the number of cylinders in a simple constitution by providing a switch valve element for opening and closing a part of valve element passages of rotary valve elements in a common rotary shaft where rotary valve elements of suction and exhaust valves are formed. CONSTITUTION:A suction valve and an exhaust valve comprising rotary valve elements 10, 11 formed on a common rotary shaft 12 are provided on a suction port and an exhaust port of each cylinder, and valve passages 13, 14 for suction and exhaust are formed in such a manner as to pierce through the rotary shaft 12 along the diameter of the rotary shaft 12. The rotary valve elements 10, 11 for suction and exhaust of a cylinder paused by cylinder number control are formed like a hollow cylinder, and a cylindrical switch valve element 15 for opening and closing the respective valve element passages 13, 14 for auction and exhaust is slidably inserted in the interior thereof. The switch valve 15 is controlled to close the valve through a hydraulic cylinder 19 according to a cylinder reducing operation command output from a control circuit 18 when load detection means 17 detects the light load condition.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a cylinder number control device for a rotary valve engine, and in particular to a device for controlling the number of cylinders in a rotary valve engine with a small and compact configuration using an hour wheel. The present invention relates to a cylinder number control device for a rotary valve engine.

(Prerequisite configuration) A rotary valve engine to which the present invention is applied is a multi-cylinder rotary valve engine in which at least one of an intake valve and an exhaust valve is a rotary valve.
As shown in FIGS. 1 and 2, a rotary valve engine in which the rotary valve body 10 of the intake valve 7 of each cylinder 5 and the rotary valve body 11 of the exhaust valve 9 are formed on a common rotating shaft 12, or As shown in FIG. 5, the rotary valve bodies 10 of the intake valves 7 of each cylinder 5 are formed on one common rotating shaft 12a, and the rotary valve bodies 11 of the intake valves 9 of each cylinder 5 are formed on one common rotating shaft 12a. A rotary valve engine formed on the rotating shaft 12b is included. In the engine 1 equipped with a rotating shaft 12a for an intake valve and a rotating shaft 12b for an exhaust valve, there are two cases in which each rotating shaft 12a and 12b is formed of a hollow shaft having the function of a main pipe of a manifold, and another case in which the rotating shafts 12a and 12b are formed with a hollow shaft having the function of a main pipe of a manifold. Sometimes it is formed with a real axis.

Also, a valve body passage 13 formed in each rotary valve body 10.11.
．． 14 is formed to cross the diameter of the rotary valve body 10.11 when the rotary shafts 12.12a, 12b are solid shafts, and one side of the rotary valve body 10.11. Some rotation shafts 12, 12a are formed by cutting out a portion in the shape of a crescent moon.

When 12b is a hollow shaft, it is formed so as to penetrate its peripheral wall at a predetermined phase.

(Prior Art) In a multi-cylinder engine, for example, in order to improve fuel consumption characteristics under light loads, some cylinders may be deactivated and the remaining cylinders may be used to maintain operation.

When controlling the number of operating cylinders in this manner, the supply of fuel and/or the supply of combustion air to the cylinders to be deactivated is cut off.

Shutting off the combustion air is effective in preventing erroneous air-fuel ratio control due to dilution of exhaust components by air passing through idle cylinders, especially when detecting exhaust components to control the air-fuel ratio. be.

- In terms of M, in order to cut off the supply of combustion air to a part of the cylinders, a clutch is interposed in the valve train mechanism, and the clutch is configured to partially cut off the transmission of the operation of the valve train. In this method, an excessive operation absorption mechanism is interposed in the valve mechanism, and a check means is provided to check the final stage parts of the valve mechanism, such as a predetermined valve or a rocker arm that drives the same, to the valve closing position. There is a method of absorbing the movement of the valve mechanism that attempts to open the valve when the valve or the final stage part of the valve mechanism such as a rocker arm that drives the valve is restrained to the closed position by an excessive movement absorption mechanism. Conceivable.

However, there are the following problems in adopting these methods in a rotary valve engine with the above-mentioned prerequisite configuration, and so far it has not been possible to control the number of cylinders in a rotary valve engine with the above-mentioned prerequisite configuration. It is thought that it is not possible.

(Problem to be solved by the invention) That is, in a rotary valve engine having the above-mentioned prerequisite configuration, like an engine with a normal mushroom valve, there is a problem in the valve mechanism that controls the operation of some intake valves and exhaust valves. If a clutch were to be used to interpose the transmission, it would be interposed in the middle of the rotating shaft where the valve bodies of each cylinder are formed.

However, while it is possible to isolate a part of the rotating shaft that is rotating at high speed from other parts and stop it in accurate phase, it is possible to separate a part of the rotating shaft that is rotating at high speed and a part of the rotating shaft that is stationary. There are no clutches that are configured to connect other parts with accurate phase alignment, and the location where this rotating shaft is located is also where intake ports, exhaust ports, etc. are normally located. Therefore, it is difficult to obtain space to install a clutch that requires such a special function.

In addition, although the excessive motion absorption mechanism can absorb a finite amount of excessive motion that occurs periodically, it cannot absorb excessive motion that gradually accumulates and the limit of the accumulation is indefinite. Can not. In a rotary valve engine, the rotating shaft that makes up the rotary valve body rotates continuously in one direction, so one part of the rotating shaft has to stop midway and the other part continues to rotate, so it gradually becomes over-operated. accumulates, and the limit of the accumulation is indefinite. Therefore, it is impossible to control the number of cylinders using the excess operation absorption mechanism.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to enable the number of cylinders to be controlled with a simple and compact structure in a rotary valve engine having the above-mentioned prerequisite structure. be.

Means for Solving the Problems) The cylinder number control device for a rotary valve engine according to the present invention takes the following technical measures to achieve the above object.

That is, as shown in FIGS. 1, 3 to 6, the rotating shafts 12.12a, 12. A valve body passage 13 of a rotary valve body 10° 11 for intake and/or exhaust of a portion of the cylinder 5 in b.
．． An on-off valve body 15 is provided to open and close the valve body 14, and an opening/closing operation is performed to switch the position of the on-off valve body 15 between a closed position where the valve body passage 13.14 is closed and an open position where the valve body passage 13.14 is opened. Means 19 are provided.

The on-off valve body 15 is a part of the rotating shafts 12.12a, -12b, and is a separate part that is slidable in the axial direction or circumferential direction with respect to other parts of the rotating shafts 12, 12a, 12b. It is formed as a separate part from the rotating shaft 12.12a, 12b which is formed or inserted into the rotating shaft 12, 12a, 12b.

The opening/closing valve body 15 has a valve body passage 13 that is opened and closed by the opening/closing valve body 15.
．． In some cases, a part or all of the valve body passage 13, 14 is formed, and in other cases, the valve body passage 13, 14 is not formed at all.

Further, the opening/closing operation means 19 is not particularly limited, and for example, a hydraulic, pneumatic, or electric actuator may be used. As an actuator that uses hydraulic pressure or pneumatic pressure, for example, the above-mentioned rotating shaft 12.12a
, 12b, and a piston 19b slidably fitted into the cylinder chamber 19a.
9. This cylinder may be a single-acting cylinder equipped with a return spring 22, or a double-acting cylinder.

<Operation of the Invention> In the above configuration, when the opening/closing valve body 15 is moved to the closed position by the opening/closing operation means 19, the intake or exhaust valve passages 13, 14 are closed, and a portion of the cylinder 5 is closed. The supply of combustion air to the cylinder 5 is cut off and the cylinder 5 is stopped. Moreover, since the on-off valve body 15 is provided within the rotating shaft 12, no extra space is required around the rotating shaft 12, and the structure can be made small and compact.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of intake and exhaust rotary valve bodies of a rotary valve engine according to an embodiment of the present invention, and FIG. 2 is a schematic plan view of the main parts of the rotary valve engine.

An intake manifold 3 is fixed to one side of a head block 2 of this rotary valve engine l, and an exhaust manifold 4 is fixed to the opposite side. An intake valve 7 is interposed in each intake port 6 extending from the intake manifold 3 to each cylinder 5, and an exhaust valve 9 is interposed in each exhaust port 8 extending from the exhaust manifold 4 to each cylinder 5.

These intake valves 7 and exhaust valves 9 are made of rotary pulp, and the rotary valve body lO of each intake valve 7 and the rotary valve body 11 of each exhaust valve 9 are formed on a common rotating shaft 12, and the intake valve body passage 13 The exhaust valve body passage 14 is formed so as to pass through the rotating shaft 12 along the diameter of the rotating shaft 12.

The intake and exhaust rotary valve bodies 10 and 11 of the cylinder 5 which is deactivated due to cylinder number control are formed in a hollow cylinder shape, and inside thereof are cylinders that open and close the intake and exhaust valve passages 13 and 14. A shaped open/close valve body 15 is slidably inserted. This opening/closing valve body 15 is moved to the opening position (opening position) where the valve body passages 13, 14 for intake and exhaust are opened by the opening/closing operation device 216.
1) and a valve closing position (shown as a phantom line in FIG. 1) where these valves are closed.

As shown in FIG. 1, this opening/closing operation device 16 includes a load detection device 17 that detects the load state of the engine 1, and outputs a cylinder reduction operation command when this load detection device 17 detects a light load state. A control circuit 18, a single-acting hydraulic cylinder 19 as an opening/closing operation means consisting of a cylinder chamber 19a formed in the rotating shaft 12 and a piston 19b slidably fitted therein; A pressure oil passage 20 that supplies oil, a solenoid valve 21 that is interposed in this pressure oil passage 20 and is switched from a discharge position to a supply position in response to the cylinder reduction operation command, and a solenoid valve 21 that opens and closes against the hydraulic cylinder 19. A return spring 22 is provided that urges the valve body 15 to the valve open position. The piston 19b is formed in series with the on-off valve body 15, and receives internal pressure in the cylinder chamber 19a to move the on-off valve body 15 to the valve closing position against the return spring 22.

In the above configuration, when the load detection means 17 detects a light load operating state, the control circuit 18 outputs a cylinder reduction operation command, the solenoid valve 21 is switched to the supply position, and the cylinder chamber 19a is switched to the supply position.
Pressure oil is filled inside. The pressure of this pressure oil causes the piston 19 to
b moves the on-off valve body 15 from the valve open position to the valve close position against the return spring 22. This allows the valve body passage 13.14
is closed by the on-off valve body 15 and the valve body passages 13 and 14 communicate with the intake port 6 or the exhaust port 8, since the intake port 6 or the exhaust port 8 is blocked by the on-off valve body 15, the idle cylinder 5 The supply of combustion air to is cut off. Since the on-off valve body 15 is provided inside the rotating shaft 12, no extra space is required around the rotating shaft 12, and the structure can be small and compact.

In another embodiment of the invention shown in FIG. 3, the valve body passageway 13.
14 is formed by cutting out one side of the rotating shaft 12 in the shape of a moon. A portion of the rotating shaft 12 in which these valve body passages 13 and 14 are formed and a portion adjacent to this portion in the axial direction of the rotating shaft are formed separately from other portions of the rotating shaft 12 as an on-off valve body 15. Ru.

A crescent-shaped notch 23 is provided on one side of the rotating shaft 12 so that this portion can slide over a predetermined stroke in the axial direction. The opening/closing operation device 15 for switching the position of the opening/closing valve body 14 is constructed in the same manner as in the above embodiment, and its cylinder chamber 19a is recessed in one end face of the notch 23, and the return spring 22 is recessed in the other end. A spring receiver recessed in the end face of is inserted into the hole 24. The rest of the structure is the same as that of the above embodiment.

In this embodiment, when the load is light, the on-off valve body 15 slides in the axial direction of the rotating shaft 12 and is switched to the closed position shown in phantom lines, and the valve body passages 13 and 14 are connected to the intake ports 6 and 6, respectively.
Or it is moved to a position away from the exhaust port 8 in the axial direction. Therefore, each port 6.8 is connected to the valve body passage 13.1.
4, the valve body passage 1
The part of the on-off valve body 15 adjacent to 3 and 14 is the intake port 6.
Alternatively, the exhaust port 8 is shut off and the supply of combustion air to the cylinder 5 is stopped.

FIG. 4 is a perspective view of main parts showing still another embodiment of the present invention. In this embodiment, a portion of the rotating shaft 12 in which the valve body passage 13° 14 is formed, a portion adjacent to this portion in the circumferential direction of the rotating shaft, and an end wall portion extending toward the center at one end of these portions. 24 is formed separately from other parts of the rotating shaft 12 as the on-off valve body 15. A notch 23 that unfolds in an arc shape is provided on the circumferential surface of the rotating shaft I2 so that the on-off valve body 15 can slide over a predetermined stroke in the circumferential direction. A circumferential groove-shaped notch 25 to be fitted is formed. The opening/closing operation device 16 for switching the position of the opening/closing valve body 15 is equipped with a double-acting cylinder 19, and the cylinder chamber I9a has a rotating shaft located within a portion of the rotating shaft 12 on one side of the end wall portion 24 of the opening/closing valve body 15. A piston 19b, which is formed in a fan shape concentric with the piston 12 and protrudes from the end wall portion 24 in the axial direction, is slidably inserted into the cylinder chamber 19a. Pressure oil passages 20a and 20b are connected to both ends of the cylinder chamber 19a, respectively, and a direction switching valve 26 is provided to switch the direction of the pressure oil supplied to the cylinder chamber 19a via these pressure oil passages 20a and 20b. It will be done. This directional selector valve 26 is switched to the cylinder reduction operation position in which the repressurization oil passages 20a and 20b are positively connected when receiving the cylinder reduction operation command from the control circuit 18, and is switched to the cylinder reduction operation position when the cylinder reduction operation command is not received. The oil passages 20a and 20b are switched to a normal operating position where they are connected in reverse.

Note that each of the valve body passages 13 and 14 is formed so that a portion thereof is recessed into the bottom surface of the notch 23 of the rotating shaft 12. The rest of the structure is the same as in each of the above embodiments except that the return spring is omitted.

In this embodiment, during cylinder reduction operation, the on-off valve body 15 moves in the circumferential direction of the rotating shaft 12 (in the direction of the arrow), and the valve body passage 13.
At the timing when the opening phase of 14 is moved and each port 6.8 is communicated with the valve body passage 13.14, the intake valve 6 and the exhaust port 7 are connected to the opening/closing valve body 15 adjacent to each valve body passage 13.14. The cylinder 5 is closed by the part of
The supply of combustion air to is stopped.

In another embodiment of the present invention shown in FIGS. 5 and 6, a rotary valve body 10 for intake of each cylinder 5 is provided in the cylinder head 2.
A rotating shaft 12a on which is formed, and a rotating shaft 12b on which an exhaust rotary valve body 11 of each cylinder 5 is formed are rotatably supported. These rotating shafts 12a and 12b are formed into a hollow cylindrical shape with one end covered so as to be used as an intake manifold or an exhaust manifold, and an intake valve body passage 13 or an exhaust valve body passage 14 is formed on the peripheral wall of the hollow cylinder shape. has been done. Taking the case of an intake valve as an example, the rotation shaft 1
A cylindrical open/close valve body 15 is fitted inside 2a so as to be rotatable about the same axis as the rotating shaft 12a, and a valve hole 30 having the same shape and size as the valve body passage 13 is formed in the peripheral wall of the open/close valve body 15. has been done. This opening/closing valve body 15 is driven to swing around its axis by an opening/closing operation means (not shown) between an open position where the valve body passage I3 and the valve hole 30 overlap and a closed position where they do not overlap each other. It has become.

In the case of an exhaust valve, an on-off valve body 15 having a similar valve hole 31 is used.
is inserted into the rotating shaft 12b, and can be switched between a valve open position and a valve closed position by an opening/closing operation means (not shown).

In this embodiment, during cylinder reduction operation, the on-off valve body 15 is switched to the closed position, and the valve body passage 13.14 and the valve hole 30.31 are connected to each other.
is shut off, and the supply of combustion air to the cylinder 5 is stopped.

<Effects of the Invention> As explained above, in the cylinder number control device for a rotary valve engine of the present invention, a part of the rotary valve body of the intake valve and/or a valve body of the exhaust valve are formed within a common rotating shaft. An on-off valve body is provided to open and close the valve body passage of the rotary valve body for intake and/or exhaust of the cylinder, and the position of this on-off valve body is changed to a closed position where the valve body passage is closed and a position where the valve body passage is open. The number of cylinders of a rotary valve engine having the above-mentioned prerequisite configuration can be controlled with a simple configuration of providing an opening/closing operation means for switching between the valve opening position and the valve opening position. Further, since the on-off valve body is provided within the rotating shaft, no extra space is required around the rotating shaft, and the device can be made small and compact.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an intake and exhaust rotary valve body of a rotary valve engine according to an embodiment of the present invention, Fig. 2 is a schematic plan view of the main parts of the rotary valve engine, and Fig. 3 is a main part of the rotary valve engine. FIG. 4 is a perspective view of the main parts of the rotary valve bodies for intake and exhaust of a rotary valve according to another embodiment of the invention; FIG. FIG. 5 is a perspective view of the main parts, FIG. 5 is a plan view of the main parts of another rotary valve engine, and FIG. 6 is a perspective view of the intake rotary valve body of the rotary valve engine. ■...Rotary valve engine, 2...Head block, 3...Intake manifold, 4...Exhaust manifold, 5...Cylinder, 6...Intake port, 7...
...Intake valve, 8...Exhaust port, 9...Exhaust valve, 1
0.11...Rotary valve body, 12.12a, 12b...
Rotation shaft, 13° 14 valve body passage, 15... open/close valve body,
19... Cylinder (opening/closing operation means). Patent applicant: Kubota Iron Works Co., Ltd.
Mr. Hisashi Kitatani 7-,・,1 Figure 1 Figure 2

Claims (1)

[Claims] 1. The intake valve 7 that connects and disconnects the intake port 6 and/or the exhaust valve 9 that disconnects and connects the exhaust port 8 are constituted by rotary valves, and the rotary valve body 10 of the intake valve 7 and/or the exhaust valve 9 In a multi-cylinder rotary valve engine in which rotary valve bodies 11 are formed on a common rotating shaft 12, 12a, 12b, there is a valve for intake and/or exhaust of a portion of the cylinder 5 within the rotating shaft 12, 12a, 12b. An on-off valve body 15 is provided to open and close the valve body passages 13 and 14 of the rotary valve bodies 10 and 11, and the position of this on-off valve body 15 is set to the closed position where the valve body passages 13 and 14 are closed, and the valve body passage 13, 14 is provided with an opening/closing operation means 19 for switching the valve to an open position, in which a cylinder number control device 2 for a rotary valve engine is provided, and a part of a rotating shaft 12 is slidably displaced in the axial direction of the opening/closing valve. The valve body 15 is formed separately from other parts of the rotating shaft 12, and the valve body passages 13 and 14 formed in the other parts of the rotating shaft 12 open and close the open/close valve body 1 by sliding displacement of the open/close valve body 15.
The cylinder number control device 3 for a rotary valve engine according to claim 1 is configured to be opened and closed at a joint surface between the rotating shaft 12 and the rotating shaft 12, and a part of the rotating shaft 12 slides in the axial direction thereof. The valve element passages 13 and 14 formed in the opening/closing valve element 15 are formed separately from the other parts of the rotating shaft 12 as a displacing opening/closing valve element 15, and the valve element passages 13 and 14 move around the rotating shaft 12 due to the sliding displacement of the opening/closing valve element 15. A cylinder number control device 4 for a rotary valve engine according to claim 1 or 2, which is configured to open and close in a plane, and an opening/closing valve body 15 on which a portion of the rotating shaft 12 slides in its circumferential direction. is formed separately from other parts of the rotating shaft 12,
The valve body passages 13 and 14 formed between the on-off valve body 15 and the other part of the rotating shaft 12 are formed at the joint surface between the on-off valve body 15 and the other part of the rotating shaft 12 due to the sliding displacement of the on-off valve body 15. Claim 1 configured to be opened and closed at
The cylinder number control device 5 for a rotary valve engine according to paragraph 1, wherein the opening/closing operation means includes a cylinder having a cylinder chamber formed in the rotating shaft and a piston slidably fitted in the cylinder chamber; Claims 1 and 2, wherein the cylinder is configured to receive internal pressure in the cylinder chamber and displace the opening/closing valve body to the valve opening position and the valve closing position.
The cylinder number control device 6 for a rotary valve engine according to claim 3 or 4, and the cylinder for a rotary valve engine according to claim 5, wherein the cylinder is a single-acting cylinder equipped with a return spring. The number control device 7 is a cylinder number control device for a rotary valve engine according to claim 5, wherein the cylinder is constituted by a double-acting cylinder.