JPS59170583A - Rotary valve driving device - Google Patents

Abstract

PURPOSE:To prevent a slack by connecting an end of arm and a drive shaft of an actuator by a leaf spring. CONSTITUTION:Pins 13, 14, 15, 16 are fixed to an end of arms 17, 18, 19, 20 which are fixed to the end of valve shafts 9, 10, 11, 12, and one end of leaf springs 29, 30, 31, 32 is fixed to the pins 13, 14, 15, 16 while the other end of the leaf springs 29, 30, 31, 32 is fixed to a drive shaft 28 of an actuator 21. In this manner, as the cylindrical end of the respective leaf springs 29, 30, 31, 32 is tightened to the pins 13, 14, 15, 16 fixed to the end of the arms 17, 18, 19, 20 of rotary valves 5, 6, 7, 8 by virtue of its own spring action, a danger of generating a slack is prevented in the usage of a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a drive device for a rotary valve, and the present invention relates to conventional technology.When a rotary valve is dynamically controlled by a drive shaft that moves linearly, it is usually disclosed in, for example, Japanese Patent Application Laid-Open No. 57-1999. As described in Japanese Patent No. 176320, an arm is fixed to the valve shaft of a rotary valve, and the tip of the arm and the drive shaft are connected to each other by a link [2]. In this case, one end of the link is pivotally connected to the arm tip through a pivot pin, and the other end of the link is pivotally connected to the drive shaft through a pivot pin.

However, when a pivot pin is used in this way, play occurs when used for a long period of time, and when the number of rotary valves to be controlled increases, the number of pivoting parts increases and the structure becomes complicated. .

OBJECTS OF THE INVENTION It is an object of the present invention to provide a rotary valve drive device that does not generate rattling even after long-term use, has a simple structure, and is easy to assemble.

Structure of the Invention The structure of the present invention is that the tip of the arm and the drive shaft of the actuator are connected by a leaf spring member.

Embodiment Referring to FIG. 1, 1.2.3.4 is a fluid passage; 5;
6, 7.8 are fluid passages respectively], 2, 3.

a rotary valve in the form of a butterfly valve provided within 4;
9, 10. 11. 12 is the valve stem of rotary valve 516° 7.8, 13. 14. 1! '1.16 is valve shaft 9°10.11
．． Arms fixed to the ends of 12, 17.18, 19.
20 indicates a pin fixed to the tip of the arms 13, 14, 15, and 16, 21 indicates an actuator, and each valve shaft 9
, 10.11°12 are placed on the -@string line. The actuator 21 includes a negative pressure chamber 23 and an atmospheric pressure chamber 24 separated by a diaphragm 22, and a compression spring 25 for pressing the diaphragm is inserted into the internal pressure chamber 23. This negative pressure chamber 23 is selectively connected to a negative pressure source 27 or feces via a switching valve 26. One end of a control rod 28 is fixed to the diaphragm 22, and this control rod 28 is connected to the valve shaft 9.
, 1.0, 11, and 12 in a straight line.

The control rod 28 has a slightly curved leaf spring member 2.
9, 30, 31゜One end of 32 has a screw or rivet 3
3,34°35.36, and the other ends of the plate spring members 29.30, 31.32 are wound into a cylindrical shape and can be rotated on the corresponding pins 17.18, 19.20. is fitted into the The pins 17, 18, 19, 20 and the leaf spring members 29, 30, 3], 32 have the same shape, so see FIGS. 2 and 3 (7).
The pin 17 and plate ridge member 29 will be explained.

Referring to FIG. 3, the lower end of the pin 17 is fixed to the tip of the arm 13, and the head 37 of the pin 17 is formed into a spherical shape. As described above, the tip 38 of the plate spring member 29 is formed into a substantially cylindrical shape, and the inner peripheral surface of the intermediate portion of the cylindrical tip 38 is formed into a partially spherical shape capable of receiving the spherical head 37. Ru. Therefore, the cylindrical tip 38 is fitted into the spherical head 37 by pushing the cylindrical tip 38 into the spherical head 37 from above. Once the cylindrical tip 38 is fitted onto the spherical head 37, the cylindrical tip 38 is held onto the spherical head 27 by its own spring force; Since the spherical head 37 is always tightened by the spring force, no looseness occurs.

Returning again to FIG. 1, the arms ], 3, 15 extend in the opposite direction to the arm 14.16 with respect to the control rod 28, so that the leaf spring member 29.31 extends relative to the control rod 28 in the direction opposite to the leaf spring member 30.32. is located on the opposite side. Due to the switching action of the switching valve 26, when the negative pressure chamber 23 of the actuator 21 is connected to the negative pressure source 27, the diaphragm 22 moves to the right against the compression spring 25. As a result, the rotary valve 5. 7 is rotated clockwise and the rotary valve 6.8 is rotated counterclockwise so that the rotary valve 5.7 closes the corresponding fluid passage 1.3 and the rotary valve 6.8 responds. The fluid passage 2.4 is fully opened. The position of the leaf spring member 29 at this time is indicated by a chain line 29a in FIG. Then, the diaphragm 22 is moved to the left by the spring force of the compression spring 25. As a result, the rotary valve 5.7 is rotated counterclockwise, and the rotary valve 6.8 is rotated clockwise. The rotary valve 5.7 fully opens the fluid passage 1.3, and the rotary valve 6.8 closes the fluid passage 2.4.The position of the leaf spring member 29 at this time is indicated by a broken line 29b in FIG. Therefore, as shown in FIG.
3 can be rotated over a range of angle θ. In the embodiment shown in FIG. 1, leaf spring members 28, 31 and leaf spring members 30, 32 having the same number of cylinders are provided on both sides of the control rod 28, so that the middle portion of the control rod 28 is not supported. Even if the control rod 28 is moved linearly.

In the embodiment shown in FIG. 3, the ρ1 cylindrical tip 38 of the leaf spring member 29 is directly fitted into the spherical head 37 of the pin 17. However, it is also possible to indirectly fit the cylindrical tip 38 onto the pin 7 as shown in FIGS. 4 and 6. That is, a synthetic resin cap 42 having a groove 40 as shown in FIG. 5 and a spherical recess 41 as shown in FIG. 4 is fitted onto the spherical head 37, and this cap The cylindrical tip portion 3 of the leaf spring member 29 is placed on the outer peripheral surface of the leaf spring member 42.
8 may be fitted. Further, as shown in FIG. 6, the pin 17 is formed with a small-diameter upper end 17a, a hollow cylindrical sleeve 43 is fitted into the small-diameter upper end 17a, and a leaf spring is mounted on the outer peripheral surface of the hollow cylindrical sleeve 43. The cylindrical tip 38 of the member 29 may be fitted.

FIGS. 7 to 10 each show various modifications. In FIGS. 7 to 10, the same components as in FIG.

In the embodiment shown in FIG. 7, a pair of leaf spring members 30.
31 are secured together to the control rod 28 by a single screw or rivet 44.

Therefore, in this embodiment, the number of screws or bets can be reduced.

In the embodiment shown in FIG. 8, the intermediate portion of the leaf spring member 45 is fixed to the control rod 28 by screws or rivets 46VC, and both ends of the leaf spring member 45 are connected to pins 17, 19, respectively. Therefore, in this embodiment, the number of leaf spring members and the number of screws or vents can be reduced.

In the embodiment shown in FIG. 9, an elongated leaf spring member 47 is used instead of the control rod Vc. One end of this leaf spring member 47 is connected to the pin 20 of the rotary valve 8, and the leaf spring member 47 is connected to the pin 20 of the rotary valve 8. The other end of the member 47 is an actuator 4 consisting of a solenoid.
8. Take care, the remaining leaf spring members 29.30.
31 is fixed to the leaf spring member 47 with screws or rivets 33, 34, and 35. This embodiment has the advantage that no control rods are required.

In the embodiment shown in FIG. 10, each plate spring member is 50°51.5
2.53 is a linear extension 50a, 5]a.

52a, 53a, and curved portions 50b, 51b, 52b, 5
3b, each leaf spring member 50, 51.

52.53 have the same shape. A linear extension 50a of each adjacent leaf spring member 50, 51, 52, 53,
51a, 52a, and 53a are arranged in a straight line and connected to each other by screws or screws 54, 55, and 56. Therefore, this embodiment also has the advantage that no control rod is required.

In the embodiment shown in FIGS. 9 and 10, the rotary valves 5, 6, 7.8 are fully opened at the same time and closed at the same time.

FIG. 1 shows a case where the rotary valve drive device shown in FIG. 1 is applied to an internal combustion engine. Referring to FIG. 11, 60 is the engine body, 61 is the cylinder, 62 intake valves, 63 exhaust valves, 64 is the intake boat, 65 is the intake pipe, and the negative pressure chamber 23 of the actuator 21 is the engine rotation speed sensor. Alternatively, the valve shafts of intake control valves 67 and 68 are connected to the intake and intake pipes 65 via the switching valves 26 (7) which respond to the output signal of the negative pressure sensor 66. 6
9.70 is placed. An arm 71.72 is fixed to each valve shaft 69, 70, and the distal end of each arm 71.72 is connected to the control rod 28 via a leaf spring member 73.74.

When the engine speed is lower than a predetermined rotation speed or when the negative pressure in the intake pipe 65 is greater than the predetermined negative pressure, the actuator 2 is switched by the switching action of the switching valve 26.
One negative pressure chamber 23 is connected within the intake pipe 65. As a result, since negative pressure acts within the negative pressure chamber 23, the diaphragm 22
moves to the right and rotates the intake control valves 67, 68 to the maximum closed position 1. At this time, the mixture flows at high speed along one side wall of the intake boat 64 as shown by arrow A, and thus a strong swirling flow as shown by arrow B is generated in the cylinder 6. As a result, the kiln firing rate is accelerated and stabilized*, making it possible to obtain kiln firing. On the other hand, when the engine speed becomes higher than a predetermined rotation speed or when the negative pressure in the intake pipe 65 becomes smaller than the predetermined negative pressure, the negative pressure chamber 23 is turned to the atmosphere by the switching action of the switching valve 26. As a result, the diaphragm 22 moves to the left, so that the intake control valves 67, 68 are fully opened.

In this way, high charging efficiency can be obtained during engine high-speed, high-load operation.

Effects of the Invention Since the cylindrical tip of each leaf spring member is tightened by its own spring force onto a pin fixed to the tip of the arm of the rotary valve, play may occur even after long-term use. There is no danger and thus the rotary valve can be controlled reliably over a long period of time. Furthermore, since the structure of the rotary valve drive device is simplified, the reliability of the rotary valve drive device can be improved and manufacturing costs can be reduced. - There is also the advantage that the control rod support member can be omitted since there is no need to support the intermediate part of the control rod.

[Brief explanation of drawings]

Fig. 1 is a plan view of a rotary valve drive device according to the present invention, Fig. 2 is a partially enlarged view of Fig. 1, Fig. 3 is a side sectional view of Fig. 2, and Fig. 4 shows another embodiment. A side sectional view of a part of the rotary valve drive device, FIG. 5 is a side view of the cap shown in FIG. 4,
FIG. 6 is a side sectional view of a part of the rotary valve drive device showing still another embodiment, FIG. 7 is a plan view of a part of the rotary valve drive device showing still another embodiment, and FIG. FIG. 9 is a plan view of a part of the rotary valve drive device showing another embodiment; FIG. 9 is a plan view showing still another embodiment of the rotary valve drive device;
FIG. 0 is a plan view showing yet another embodiment of the rotary valve drive device, and FIG. 11 is a plan sectional view of the inner furnace engine. 5.6, 7.8... rotary valve, 9, ] 0,
11゜12... Valve shaft, 13.14, 15.16...
Arm, 17.18, 19.20... Pin, 21...
Actuator, 28... control rod, 29, 30
. 31. 32.45,50,51. 52,53°73
．． 74...Plate spring member. Patent applicant Toyota Motor Corporation Patent application agent Akira Aoki, patent attorney Kazuyuki Nishidate, patent attorney Kyosuke Donakayama, patent attorney Akira Yamaguchi C) +-

Claims (1)

[Claims] A rotary valve drive device in which an arm is attached to the valve shaft of a rotary valve, the tip of the arm is connected to a drive shaft of an actuator, and the valve shaft is rotated by moving the drive shaft in the axial direction. A rotary valve drive device in which the tip of the arm and the drive shaft of the actuator are connected by a spring member,