JP3318027B2 - Valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary shaft arranged in a diametrical direction in a pipe forming a fluid passage, and a disc-shaped valve body for controlling a flow area of the fluid passage is mounted on the rotary shaft. The present invention relates to a valve device comprising: The valve device according to the present invention is particularly suitable as a valve device inserted into an exhaust pipe in order to control a flow area of an exhaust passage of a vehicle engine according to an operation state of the engine.

[0002]

2. Description of the Related Art In a vehicle engine, exhaust noise can be reduced by reducing the area of the exhaust passage, and good drivability can be obtained by improving the acceleration response accompanying a decrease in the flow resistance by increasing the area of the exhaust passage. By the way, since it is more important that the exhaust noise is low when the vehicle is running at low speed, a valve device is provided in the exhaust pipe, and when the vehicle is running at low speed, the exhaust passage area can be reduced to reduce the exhaust noise. Is being done.

For example, Japanese Utility Model Laid-Open No. 63-21721 discloses such a valve device as a valve structure of a control type silencer. This valve structure, in the pipe that circulates exhaust gas,
A valve body is housed, a rotary shaft for rotating the valve body in the radial direction of the pipe is inserted therethrough, and a tip of the rotary shaft is supported by a first bearing fixed to the pipe,
A rear portion of the rotating shaft is inserted and supported in a second bearing fixed to the pipe, and a sealing member disposed adjacent to the second bearing is provided on a projecting portion of the rotating shaft projecting from the second bearing. The rotation lever is fixed via the rotation lever.

[0004] An urging means for pressing the rotary lever toward the seal member is provided, and the rotary shaft and the valve element are pressed against the other side of the pipe via the rotary lever by the urging means. The body is positioned in the thrust direction.

[0005]

In the above valve structure, the valve body itself also serves as a positioning member, and the outer peripheral edge of the valve body is pressed against the inner peripheral surface of the pipe at the tip end of the rotating shaft. Since the valve body is not a flat surface but an arc surface, play occurs during rotation of the valve body, and friction increases with the rotation, so that it is difficult to obtain a smooth on-off valve operation.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a rotary shaft arranged in a diametrical direction in a pipe forming a fluid passage, and the rotary shaft is attached to the rotary shaft. In a valve device having a disc-shaped valve body for controlling a flow area of the fluid passage, the rotation shaft is rotated at a portion protruding outward through the pipe at one end of the rotation shaft. Fix the drive member for causing the valve body to
At one end of the rotating shaft, bend the one end of the valve body at a right angle.
The formed bent portion is provided integrally, and the disc-shaped valve body and
And a boss portion interposed between the driving members and one end of the valve body
A predetermined clearer in the axial direction of the rotating shaft with the bent portion of
The boss portion is fixed to the tube body with a ball .

According to the present invention, the movement of the valve element in the rotation axis direction is suppressed between the position where the bent portion contacts the boss portion and the position where the driving member contacts the boss portion. Since the boss is interposed with a predetermined clearance between the bent portion and the driving member, the valve body can move within the range of the clearance. That is, the valve body is positioned in the axial direction of the rotating shaft within an allowable range corresponding to the clearance.

Thus, in the valve device of the present invention,
Since no special member such as an urging member is required for positioning the valve element, the configuration is simplified and the cost is reduced. Also, assemblability is improved. Further, since the valve body is not pressed against the inner peripheral surface of the pipe body and a predetermined clearance is set between the valve body and the pipe body, a smooth opening / closing operation can be obtained. Further, a clearance holding member for giving a predetermined clearance in the axial direction of the rotation shaft to the boss portion fixed to the pipe body, with a bent portion formed by bending one end of the valve body at a right angle. With this configuration, the number of parts can be reduced and the number of assembling steps can be significantly reduced. As a result, the cost can be significantly reduced. In addition, there is no fear that the clearance will change over a long period of use, so that the durability of the valve device is significantly improved.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a valve device according to an embodiment of the present invention;

FIG. 1 is a cross-sectional view of a valve device 1 according to the present invention.
2 is a partially cutaway side view, and FIG. 3 is a cutaway top view of the same part. As shown in FIG. 8, the valve device 1 includes an engine E
Is inserted into the exhaust pipe 2.

The valve device 1 is configured such that a rotary shaft 4 is disposed in a pipe 3 in a diametric direction, and a disc-shaped valve 5 is attached to the rotary shaft 4. As shown in FIG. 2, the pipe 3 is inserted between an upstream portion (engine side portion) 2a and a downstream portion (muffler portion) 2b of the exhaust pipe 2 to form a part of an exhaust passage. However, connection with the upstream portion 2a is made by fastening the flanges 6a and 6b provided on the portion 2a and the pipe body 3 with bolts 7 and nuts 8, respectively. On the other hand, the connection with the downstream part 2b is made by connecting the mouthpiece 9 fixed to the part 2b to the tube 3 via the packing 10.
And tightened with a band 11 from the outside. With such a connection structure, mounting errors of the exhaust pipe portions 2a and 2b and the valve device 1 can be absorbed.

As shown in FIG. 1, both ends of the rotating shaft 4 penetrate the pipe 3, and these penetrating portions are respectively provided with boss portions.
12a and 12b are welded to the tube 3 and provided integrally therewith. The rotating shaft 4 is provided with these bosses 12a, 12b.
Are rotatably hindered via bearings 13a and 13b, respectively. The end of the rotary shaft 4 on the boss 12a side further projects outward, but the other end does not project, and the open end of the boss 12b is sealed by a plug 14.

The valve element 5 is fixed to the rotating shaft 4 by being caulked after being tightened by bolts 15. Bends 16a and 16b, which are bent at right angles, are formed at both ends in the axial direction of the rotary shaft 4 of the valve element 5 (see FIGS. 4 to 6).

As described above, the end of the rotating shaft 4 on the side of the boss 12a protrudes further outward.
A step portion 17 is formed at a position substantially corresponding to the outer end surface of a, and a drum 18 for rotationally driving the rotating shaft 4 is fixed to the rotating shaft 4 with its side surface in contact with the step portion 17. A washer 19 is interposed between the drum 18 and the boss 12a. The drum 18 has a nut 29 screwed to the outer end of the rotating shaft 4.
Thus, the drum 18 is fixed to the rotary shaft 4 by tightening the drum 18 to the step 17 via the collar 30.

In this manner, the drum 18 is fixed to the rotary shaft 4 and the bent portion 16a formed on the valve body 5 fixed to the rotary shaft 4 is also fixed to the rotary shaft 4, so that the drum 18 is fixed. And the interval a between the bent portion 16a is always constant. A boss 12a fixed to the tube 3 enters between the drum 18 and the bent portion 16a, but the length of the boss 12a is slightly shorter than the interval a.
As shown in FIG. 1, the drum 18 is bossed through the washer 19.
When abutting against the outer end surface of the boss 12a, a predetermined clearance c is generated between the inner end surface of the boss portion 12 and the bent portion 16a.

Accordingly, the rotary shaft 4 can move in the axial direction within the range of the clearance c, and accordingly, the valve element 5 can also move in the same direction, but cannot move beyond the range of the clearance c. . That is, the valve element 5 is positioned in the axial direction of the rotary shaft 4 within an allowable range corresponding to the clearance c.

The clearance c is selected so that the end thereof is not pressed against the inner wall surface of the tube 3 regardless of the direction in which the valve 5 moves. Therefore, when the valve body 5 rotates, backlash occurs due to sliding contact with the inner wall surface of the pipe body 3,
A smooth opening / closing valve operation can be obtained without an increase in frictional force.

As described above, the valve element 5 can be positioned in the axial direction (thrust direction) of the rotary shaft 4 with a very simple structure including the bent portion 16a, the drum 18, and the boss portion 12a. This simplifies, reduces costs, and improves assemblability.

If the hole provided in the valve body 5 for passing the bolt 15 is made slightly larger, the position of the valve body 5 can be finely adjusted after the valve body 5 is mounted on the rotary shaft 4 so that the clearance c can be adjusted.
Can be set easily and accurately.

The drum 18 is formed by laminating two plates, and has an arc-shaped peripheral groove 20 formed on the outer peripheral portion, and a wire 21 (FIG. 2) is wound around the peripheral groove 20. The tip of the wire 21 is fixed to the drum 18. The wire 21 is inserted from the negative pressure actuator described later into the outer tube 22 and extends therethrough.
And is guided to the circumferential groove 20 of the drum 18 from above.

The adjustment bolt 23 is supported by a support plate member 24 fixed to the tube 3 by welding. That is, a loop-shaped portion 25a is provided at the upper end of the upper protruding portion piece 25 formed on the support plate member 24.
The adjustment bolt 23 is fixedly supported on the upper protruding piece 25 by passing the adjustment bolt 23 through the threaded portion 23a of the adjustment bolt 23 and tightening it with nuts 26 from above and below.

The bearing plate member 24 is also provided with a stopper 27 which projects radially outward from the tube 3 to the position of the drum 18. The stopper 18 is formed on the drum 18 from both sides. Stopper engaging surfaces 28a, 28b that abut
Are provided so as to sandwich a predetermined circumferential angle.

A spring 31 is fitted around the collar 30 fitted to a portion of the rotary shaft 4 projecting outward from the drum 18.
Is wound in a coil shape, and one end 31a of the spring 31
Is locked by a locking portion 32a provided on the drum 18.
The other end 31b of the spring 31 is formed at the tip of the outer portion 33a of the U-shaped frame portion 33 formed on the support plate member 24 and holding the drum 18 and the spring 31 from the front,
It is fixed via a locking portion 32b.

The spring 31 engages the drum 18 with the stopper engaging surface.
28a is urged to the position shown in FIG.
At this time, the valve body 5 fully opens the exhaust passage in the pipe body 3. Wire
When the drum 18 is rotated against the urging force of the spring 31 by the valve 21, the valve element 5 reduces the flow area of the exhaust passage,
When the stopper engaging surface 28b is engaged with the stopper piece 27, the flow area is minimized.

Since the collar 30 is made of a relatively hard material such as a SUS material, a protective collar 34 made of a material softer than the SUS material is provided around the outer periphery of the collar 30 to protect the spring 31 wound thereon. Is press-fitted. Protective color
As the material 34, a metal material such as copper or aluminum is preferably selected in consideration of the ambient temperature, but it may be made of Teflon. FIG. 7 shows an example in which the protective collar 34 is made of Teflon. In this example, a protective collar 34 made of Teflon
A clearance b is provided between the drum 18 and the drum 18 to block heat transfer from the drum 18 to the protective collar 34.

Behind the lower portion of the support plate member 24,
A similar frame-shaped piece 35 facing the frame-shaped piece 33 is formed.
The outer portion 35a of 35 is flush with the outer portion 33a of the frame-shaped piece 33. A bolt hole 36 is formed in each of the outer portions 33a and 35a, and a nut 37 facing the bolt hole 36 is welded to the inner surface. And these nuts
The cover 39 is secured to the outer part 33 by bolts 38
a, 35a. The cover 39 covers the entire half of the valve device 1 on the drum 18 side to prevent dust and the like from entering this portion.

The inner edge of the cover 39 extends along the peripheral surface of the tubular body 3 over a half circumference thereof. On the upper surface, the upper protruding piece 25 of the support plate member 24 and the adjusting bolt 23 are used for mounting. A notch 40 is provided to avoid interference. In order to prevent intrusion of dust from the hole 40, a roof plate 41 having one end welded near the top of the tube 3 extends horizontally below the notch 40 along the notch 40,
The notch 40 is closed. A clearance d (FIG. 3) is provided between the outer end of the roof plate 41 and the upper protruding piece 25, and heat is directly transmitted from the roof plate 41 heated by the exhaust in the pipe body 3 to the upper protruding piece 25. This prevents transmission to the adjustment bolt 23 via the upper protruding piece 25.

A tubular insulating piece 42 made of Teflon or the like is coaxially fitted to the upper end of the adjusting bolt 23, and the end of the outer tube 22 of the wire 21 is attached to the insulating piece 42. The insulating piece 42 prevents heat from being transmitted from the adjusting bolt 23 to the outer tube 22.

The valve device 1 described above is provided in the exhaust pipe 2 of the engine E, as shown in FIG. In FIG. 8, an engine E is a motorcycle engine and is mounted on a vehicle body frame 43 of the motorcycle. Reference numeral 44 denotes a carburetor, which communicates with an intake valve 46 via an intake passage 45. on the other hand,
The exhaust pipe 2 communicates with an exhaust valve 48 via an exhaust passage 47.
Incidentally, 54 is a fuel tank, 55 is a seat, 56 is an air cleaner case, and 57 is a rear fork.

A negative pressure actuator 49 is provided above the engine E and supported by the vehicle body frame 43.
Is connected to the negative pressure actuator 49. The fuel tank 54 straddles the vehicle body frame 43 from above, and a negative pressure actuator 49 is disposed inside the lower forked portion. The negative pressure actuator 49 operates by the negative pressure introduced thereto, and exerts a traction force on the wire 21 in accordance with the negative pressure. The wire 21 is inserted into an outer tube 22 disposed along the vehicle body frame 43, and the outer tube 22 is fixed at both ends to the negative pressure actuator 49 and the insulating piece 42, respectively. The movement of the end on the pressure actuator 49 side is accurately transmitted to the end on the valve device 1 side, and
Rotates in response to the force of the spring 31 in response to the negative pressure introduced into the negative pressure actuator 49, whereby the valve body 5 reduces the exhaust flow area. That is, the valve is closed.

A negative pressure is supplied to the negative pressure actuator 49 through a pipe 50. The pipe 50 is connected to the switching valve 51. The switching valve 51 is an electromagnetic switching valve operated by a solenoid 51a, and pipes 52 and 53 are connected in addition to the pipe 50. When the solenoid 51a is excited, the pipe 52 communicates with the pipe 50, and when the solenoid 51a is not excited, the pipe 52 communicates with the pipe 53. The switching valve 51 is provided at a position directly above the intake passage 45 so as to be supported by the vehicle body frame 43, and the pipe 52 communicates with the intake passage 45. Piping
The other end of 53 is connected to the clean side of the air cleaner case 56.

The solenoid 51a is excited when the vehicle is running at low speed and low load, and connects the pipe 50 and the pipe 52. During low-speed low-load driving, the intake air is throttled by the throttle valve, so a large negative pressure is generated in the intake passage 45, and this negative pressure is
It is transmitted to the negative pressure actuator 49 through the switching valve 51 and the pipe 50. Then, the valve device 1 closes as described above,
Since the flow area of exhaust gas is reduced, exhaust noise is reduced. Thus, it is possible to effectively reduce the exhaust noise when the vehicle is running at a low speed and a low load where it is particularly desired that the exhaust noise is low.

As shown in FIG. 8, the negative pressure actuator 49
Is provided at a position higher than the switching valve 51, and the pipe 50 is connected to a lower portion of the negative pressure actuator 49, so that fuel (gasoline) in the intake air can be prevented from accumulating in the negative pressure actuator 49. . Further, the switching valve 51 is disposed immediately above the intake passage 45, and the switching valve 51 and the negative pressure actuator 49 are positioned close to each other.
Since it is attached to 43, the length of the pipe 52 and the pipe 50 can be short, and the response delay of the valve device 1 is reduced.

[0034]

According to the valve device of the present invention, since the valve element can be positioned in the axial direction of the rotary shaft with a very simple structure, the structure is simplified, the cost is reduced, and the assembling property is improved. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a valve device according to the present invention.

FIG. 2 is a partially cut-away side view of the valve device.

FIG. 3 is a partially cutaway top view of the valve device.

FIG. 4 is a front view of a valve body.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

6 is a sectional view taken along the line VI-VI of FIG.

FIG. 7 is a partial view showing another embodiment of the present invention.

FIG. 8 is a side view of a main part of a motorcycle provided with a valve device according to the present invention in an exhaust pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve apparatus, 2 ... Exhaust pipe, 3 ... Tube body, 4 ... Rotary shaft, 5 ...
Valve element, 6 ... flange, 7 ... bolt, 8 ... at, 9 ... supply / exhaust pipe mouthpiece, 10 ... gate valve stocking, 11 ... band, 12 ... boss, 13 ... bearing, 14 ... plug, 15 ... bolt,
16 ... bending part, 17 ... step part, 18 ... drum, 19 ... washer, 20 ... circumferential groove, 21 ... wire, 22 ... outer tube, 23 ... adjusting bolt, 24 ... support plate member, 25 ... upward projecting piece, 26 ... nut, 27 ... stopper part piece, 28 ... stopper engagement surface, 29 ... nut, 30 ... collar, 31 ... spring, 32 ... locking part, 33 ...
Frame part, 34 ... Protective collar, 35 ... Frame part, 36 ... Bolt hole, 37 ... Nut, 38 ... Bolt, 39 ... Cover, 40 ... Notch hole, 41 ... Loose plate, 42 ... Insulation part , 43 ... body frame, 44 ... carburetor, 45 ... intake passage, 46 ... intake valve, 47 ... exhaust passage, 48 ... exhaust valve, 49 ... negative pressure actuator, 50 ... piping, 51 ... switching valve, 52 ... piping, 53… Piping, 54… Fuel tank, 55… Seat, 56… Air cleaner case, 57… Rear fork.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shiro Kokufu 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda R & D Co., Ltd. (56) References Japanese Utility Model 57-139643 (JP, U) Japanese Utility Model 2-141640 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01N 7/08 F01N 1/08 F16K 1/226

Claims (1)

(57) [Claims] 1. A valve device comprising: a rotary shaft arranged in a diametrical direction in a pipe forming a fluid passage; and a disk-shaped valve body for controlling a flow area of the fluid passage attached to the rotary shaft. A driving member for rotating the rotating shaft is fixed to a portion of the rotating shaft that protrudes outward through the tube at one end of the rotating shaft, and the valve is fixed to one end of the rotating shaft of the valve body. One of the body
A bent portion formed by bending the end at a right angle
And the disk-shaped valve element and the driving member
A boss portion and a bent portion at one end of the valve body are provided with the rotation shaft.
With a predetermined clearance in the axial direction,
A valve device fixed to the tube .