JPH018663Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a link device, and in particular to a link device between an on-off valve provided in a bypass passage of a helical intake port of an internal combustion engine and an actuator that opens and closes the on-off valve. The present invention relates to a link device for a bypass valve of a helical intake port used in a mechanism.

[Prior Art] In order to improve the combustibility of an internal combustion engine in a low-speed, low-load range, a helical-type intake port that generates a swirl within a combustion chamber is adopted as an intake port. This helical intake port has a problem in that when the engine is in a high-speed, high-load region and the amount of intake air increases, the flow resistance of the intake air flowing through the intake port increases and the filling efficiency decreases. In order to solve this problem, the applicant provided a bypass passage in the helical intake port that bypasses the inlet passage section that extends almost linearly and the terminal end of the spiral section downstream thereof, and an on-off valve is provided in the bypass passage. This is a helical intake port flow path control device that opens the on-off valve in the high-speed, high-load region of the engine to allow intake air to flow through the bypass passage, thereby preventing a drop in charging efficiency in the high-speed, high-load region. Proposed.

[Problems to be solved by the invention] This helical intake port flow path control device has the following problems:
An on-off valve is provided for each bypass passage of the helical intake port of each cylinder, and these valves are operated and controlled simultaneously by one actuator. Each on-off valve and the actuator are connected by a link device, but due to the arrangement of the engine, the first link connecting the bypass valves of each cylinder and the rod of the actuator are eccentric to each other. Therefore, the actuator rod is constructed by connecting the first link and the actuator rod via the second link. For this reason, the link device consists of a connected body of multiple link members, but in this case, the link device as a whole must be able to transmit the movement of the actuator rod to the bypass valve without play or twisting. It won't happen. If the operation is not transmitted with high precision, the valve opening/closing angle will deviate from the fully open and fully closed positions, and if the fully open angle deviates, the valve body will act as resistance to the flow and reduce the output performance of the engine. , and the generation of swirl is reduced if the fully closed angle deviates.

In order to make the operation transmission of the link device highly accurate, the present invention aims to eliminate the play in the connection part of the second link in the link device, and to make the operation transmission of the link device highly accurate. This is the purpose.

[Means for Solving the Problems] To achieve this purpose, the helical intake port bypass valve link device of the present invention has the following features:
A link for a bypass valve of a helical type intake port, in which a first link connected to a bypass valve provided in a bypass passage of a helical type intake port is connected via a second link to a rod of an actuator that opens and closes the bypass valve. In the device, a stepped first pin is attached to the first link, and a second link is fitted to a shaft portion of the first pin whose length is determined by the stepped portion. The first link and the second link are connected, and a stepped second pin is attached to the second link. Insert a second pin into the hole of the holder through a holder having a property, and hold a portion of the holder around the hole between the stepped portion of the second pin and the second link. The link device for a bypass valve of a helical intake port is characterized in that the second link and the rod are connected by holding the rod within the concave cross section of the holder.

[Function] By adopting the above configuration, the connection between the first link and the second link can be performed with the play as small as possible by regulating the length by the stepped portion. In addition, at the connection between the second link and the actuator rod, play in the connection can be automatically removed by the spring action of the holder. As a result, the link device will not be tilted, twisted, or loose in the play gap during operation, and the operation of the link device will be transmitted with high precision. Therefore, the bypass valve can be opened and closed accurately, thereby preventing an increase in flow resistance and attenuation of swirl due to deviations in the opening and closing angles, thereby increasing engine output and improving fuel efficiency. Can be done. In particular, the second link and the actuator rod can be connected by simply holding the rod using the spring action of the holder, making assembly extremely easy.

[Embodiments] Hereinafter, preferred embodiments of the link device for a bypass valve of a helical intake port of the present invention will be described with reference to the drawings.

First, a bypass valve of a helical intake port of an internal combustion engine to which the link device is applied and its actuator will be described. In Figure 1, 1
2 is the cylinder block, 2 is the piston that reciprocates within the cylinder block 1, and 3 is the cylinder block 1.
Cylinder head fixed on top, 4 is combustion chamber, 5
is an intake valve, and 6 is a helical intake port formed within the cylinder head 3.

As shown in FIG. 2, the helical intake port 6 consists of an inlet passage part 6a extending almost straight and a spiral part 6b connected to the downstream side of the inlet passage part 6a, and the ends of the inlet passage part 6a and the spiral part 6b are almost straight. They are connected by a bypass passage 7 that extends to. A bypass valve 8 as an on-off valve is installed in the bypass passage 7, and the bypass passage 7 can be adjusted according to the operating conditions of the engine.
Open and close. The bypass valve 8 consists of a valve body 8a and a shaft portion 8b, and the shaft portion 8b is connected to a link device 9 (third
(see figure) to a diaphragm device 10 as an actuator.

FIG. 3 shows the structure on the actuator 10 side. The diaphragm device 10 includes a diaphragm 11
The engine has a negative pressure chamber 12 defined by a negative pressure chamber 12, which is switchably communicated with an intake manifold 14 downstream of the throttle valve or with the atmosphere via a negative pressure control device 13. The negative pressure control device 13 has a negative pressure port 15 connected to the intake manifold 14 and an atmospheric port 16 connected to the atmosphere, which are opened and closed by valve bodies 17 and 18, respectively. The valve body 18 on the atmospheric port 16 side is supported by a diaphragm 19, and a negative pressure chamber 20 is provided on one side of the diaphragm 19. It communicates with the port 22 and the negative pressure port 23 on the secondary side. In addition, 24,
25, 26 are negative pressure conduits, 27, 28 are 1 each
These are the downstream throttle valve and the secondary throttle valve. These devices or members are interconnected so that the bypass valve 8 closes the bypass passage 7 when the engine is in a low speed and low load area, and the bypass valve 8 opens the bypass passage 7 when the engine is in a high speed and high load area. has been done.

A link device 9 connecting the bypass valve 8 and the diaphragm device 10 as an actuator is shown in FIGS. 4 to 7. That is, the link device 9 includes a first link 31 connecting a ball joint 30 pivotally connected to an end of a plate-shaped arm 29 attached to the shaft portion 8b of each bypass valve 8; It has a second link 33 interposed between the link 31 and a rod 32 connected to the diaphragm 11 of the diaphragm device 10.

The first link 31 and the second link 33 are rotatably connected around the pin by a first pin 34 inserted through both. The first pin 34 is a stepped pin, and in the illustrated example, the head 3
5, a shaft portion 37 of a constant length whose length is determined by the head portion 35 and the stepped portion 36, and a reduced diameter portion 38 extending further upward from the stepped portion 36. The length of the fixed shaft portion 37 is essentially the same as the length of the first pin insertion portion of the second link 33. However, since a clearance is required for rotation, the length of the pin shaft portion 37 is longer by the amount of clearance, but this clearance is not so large as to form a play in the pivoting portion, and in this sense, The lengths are essentially the same. The second link 33 has a letter shape, and the first pin 34 passes through a hole provided on one side 40 of this letter shape with a shaft portion 37, and further connects to the first link 31 with a reduced diameter portion 38. The connection is completed by extending through the provided hole and crimping the protruding end to form the enlarged diameter section 39. Note that the length of the side 40 of the letter-shaped second link 33 is formed to be appropriately long, contributing to high precision in transmission of the operation.

On the other hand, the second link 33 and the diaphragm device 1
0 rod 32 is rotatably connected to the second pin 41 inserted through both, and a holder 42 having spring properties, a so-called turn pack. The second pin also essentially consists of a stepped straight pin, having a shaft portion 43 and an enlarged diameter portion 45 having a stepped portion 44.
and a holder fitting part 46 having a smaller diameter than the enlarged diameter part 45.
and yet another shaft portion 47.
Then, the shaft portion 43 is inserted into the hole of the rod 32,
The shaft portion 47 is then fitted into the hole of the second link 33 and the end portion is caulked to form an enlarged diameter portion 48.
Note that 49 is a washia.

Further, the holder fitting portion 46 includes a turn pack 4.
Insert the second pin 41 into the hole of turn pack 4.
The part around the hole 2 is connected to the stepped part 4 of the enlarged diameter part 45.
4 and the bottom surface of the second link 33 with a very small clearance, the turn pack 42 is rotatably fitted. The turn pack 42 has a concave cross section and is open at its lower end.
The turn pack 42 has a spring property as a whole, and when the small diameter portion 51 at the tip of the rod 32 is inserted into the concave cross section while expanding the opening 50, the diameter of the opening 50 is contracted again after insertion and the rod is expanded. Hold the small diameter portion 51. Since this holding is a spring-pressed holding, the play between the rod 32 and the second pin 41 is automatically eliminated.

Next, the operation of the above device will be explained. First, when the engine is running at low speed and under low load, the negative pressure in the vent lily is small and the negative pressure control device 13 opens the atmospheric port 16, and the high negative pressure of the intake manifold 14 is introduced into the negative pressure chamber 12 of the diaphragm device 10. Link device 9
is pulled, the bypass valve 8 is moved to the closing side, the bypass passage 7 is closed, and the intake air is allowed to flow only into the helical intake port 6 to generate a strong swirling flow, and the swirl in the combustion chamber 4 improves combustibility. improve. When the engine is at high speed and under high load, the negative pressure control device 13 opens the atmospheric port 16, opens the negative pressure chamber 12 of the diaphragm device 10 to the atmosphere, pushes the link device 9, and pushes the bypass valve 8 to the open side. to open the bypass passage 7 and open the bypass passage 7.
This also allows intake air to flow through the engine to increase charging efficiency and prevent a drop in output.

In this way, each bypass valve 8 is simultaneously rotated via one link device 9 by the diaphragm device 10 as an actuator. In this case, if there is play in the link device 9, the operation of the actuator 10 will be prevented from being accurately transmitted to the bypass valve 8, and the opening/closing angle of the valve will also deviate from its normal position.

However, in the present invention, the second link 33
Since the connection between the first link 31 and the first link 31 is through the stepped pin 34, the play is minimized, and there is virtually no play, and the connection between the second link 33 and the actuator rod 32 is minimized. Since it is dependent on the turn pack 42, the play is automatically removed, so that the operation is transmitted without play. Therefore, the valve body 8a of the bypass valve 8 can be fully opened and closed completely in the bypass passage 7. Valve body 8
If a deviates from the fully open position, it will create resistance to the flow and reduce the output of the engine, but if it is fully opened accurately, the output will increase. Furthermore, if the valve body 8a deviates from the fully closed position, the generation of swirl will be reduced, but by accurately fully closing the valve body, combustion characteristics and fuel efficiency will be improved.

Next, FIGS. 8 and 9 show another embodiment of the second link connection portion of the present invention. In the figure, 52 is a second link formed in a U-shape. 53 is the first link 31 and the second link 52
54 is a shaft portion whose length is regulated. The length determined by the stepped portion of the shaft portion 54, the retaining ring 55, and the washer 56 is U.
An essentially play-free connection is achieved by inserting the shank 54 into holes drilled on the two sides, essentially equal to the outer distance of the two opposite sides of the shaped link. Further, 57 is a second pin that connects the second link 52 and the actuator rod 32, and 5 is a holder having spring properties, a so-called turn pack. By means of this second pin 57 and turn pack 58, a connection is achieved which allows rotation and automatically eliminates play. More specifically, inserting the second pin 57 into the hole of the turn pack 58,
The portion of the turn pack 58 around the hole is held between the step of the second pin 57 and the second link 52 so that the rod 32 is nestled within the concave cross section of the turn pack 58. That is, also in this example,
A play-free connection similar to the previous embodiment provides a highly precise actuation transmission. Other configurations and operations are similar to those of the previous embodiment.

[Effects of the invention] As described above, when using the link device for a helical bypass valve of the present invention, a stepped pin and a holder having spring properties are used to connect the link, so a high height with no play can be achieved. This makes it possible to connect the second link with the actuator rod, which has the effect of increasing engine output and improving fuel efficiency by improving the accuracy of operation. It is sufficient to simply hold the rod using the spring action, and the assembly is extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the helical intake port bypass valve link device of the present invention near the bypass valve, Fig. 2 is a schematic plan view showing only the intake port in Fig. 1, and Fig. 3 is a Fig. 4 is a system diagram of the actuator side of the link device for the bypass valve of the helical type intake port of the present invention, and Fig. 5 is a side view of the vicinity of the second link of the link device for the bypass valve of the helical type intake port of the present invention. 6 is a perspective view of the first pin in the device of FIG. 4, FIG. 7 is a perspective view of the holder in the device of FIG. 4, and FIG. The figure is a side view of the vicinity of the second link according to another embodiment of the helical intake port bypass valve link device of the present invention from FIGS. 4 to 7, and FIG. 9 is a side view of the device shown in FIG. 8. - a cross-sectional view along the line. 8... Bypass valve, 10... Diaphragm device as actuator, 31... First link, 33, 52... Second link, 34, 53
...First pin, 37,54...Shaft part, 41,5
7...Second pin, 42, 58...Turn pack as a holder having spring properties.

Claims (1)

[Claims for Utility Model Registration] A first link 31 connected to a bypass valve 8 provided in a bypass passage 7 of a helical intake port 6 is connected to a second link 33 to a rod 32 of an actuator 10 that opens and closes the bypass valve. ,5
In the link device 9 for a bypass valve of a helical intake port connected via a first link 31, a stepped first pin 3 is connected to a first link 31.
4, 53, and the stepped portion 36 of the first pin.
The first link 31 and the second link 33, 52 are connected by fitting the second link 33, 52 to the shaft portions 37, 54 whose lengths are determined by Stepped second pins 41, 57 are attached to the links 33, 52, and held via holders 42, 58, which have a concave cross section with an open bottom end, a hole in the top, and have spring properties. Ingredients 42,5
8, the second pins 41, 57 are inserted into the holes of the holders 42, 58, and the parts around the holes of the holders 42, 58 are connected to the stepped portions of the second pins 41, 57 and the second link 3.
The second link 33, 52 and the rod 32 are connected by holding the second link 33, 52 between the second link 33, 52 and holding the rod 32 within the concave cross section of the holder 42, 58. Linkage device for bypass valve of type intake port.