JP2002206433A - Exhaust pipe opening / closing valve device - Google Patents

Abstract

(57) [Problem] To adjust a closed position and an open position of a valve element 4 of an exhaust pipe opening / closing valve device 1 to a predetermined position easily and accurately, and reduce costs. . The other end side surface (6b) of a lever (6) abutting on an adjusting bolt (10) of a stopping means (8) for restricting a closed position of a valve body (4) to a predetermined position is formed in an arc shape so that the closed position of the valve body (4) is formed. When adjusting to the predetermined position, the contact position between the adjustment bolt 10 and the lever 6 is kept unchanged. The stopping means 7 for regulating the open position of the valve body 4 to a predetermined position may be similarly configured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust brake system which is mounted on an exhaust pipe of an engine of an automobile or the like and closes an exhaust gas passage of the engine to increase an exhaust gas pressure to operate an exhaust brake. The present invention relates to an exhaust pipe opening / closing valve device used in a warm-up system or the like for accelerating warm-up of an engine, and particularly restricts an open position and a closed position of a valve body for opening and closing an exhaust gas passage to a predetermined position. It relates to the structure of the stopping means.

[0002]

2. Description of the Related Art FIG. 5 is a front sectional view showing an example of an exhaust pipe opening / closing valve device used in a conventional exhaust brake system and a warm-up system, and FIG. 6 is a partially cutaway side view. It is. The exhaust pipe opening / closing valve device 1 is provided in the middle of an exhaust pipe of an engine (not shown) and has a through hole 2a that forms a part of an exhaust gas passage.
A rotary shaft 3 rotatably supported on the valve housing 2 via a bearing member, and a disc-shaped valve body fixed to a substantially central portion of the rotary shaft 3 with a bolt to open and close the through hole 2a. 4, one end of which is fixed to one end 3 a of the rotating shaft 3, and the other end is connected to an actuator 20 fixed to the housing 2 via the bracket 5, and is rotated by the operation of the actuator 20. A stopper 6 which engages with the lever 6 to restrict the open position and the closed position of the valve body 4 to predetermined positions,
8 is provided.

An actuator 20 for rotating the lever 6
A power piston 23 which is arranged in the shell and partitions the inside of the shell into a vacuum chamber 21 and an atmosphere chamber 22; an output rod 25 fixed to the power piston 23 and a clevis 24 fixed to the tip; 21 and a return spring 26 for urging the power piston 23 downward in FIG.
Is connected to the other end of the lever 6 via a pin 27. The vacuum chamber 21 is connected to a solenoid valve (not shown) via a pipe member 28 provided in the shell, so that the atmosphere is supplied when the solenoid valve is not operated, and the vacuum pressure is supplied when the solenoid valve is operated. Has become. The bracket 5 is provided with stop means 7 for restricting the open position of the valve element 4 to a predetermined position and stop means 8 for restricting the closed position of the valve element 4 to a predetermined position. 8 is
Each of the adjusting bolts 9 and 10 is screwed to a screw portion provided on the bracket 5, and nuts 11 and 12 for preventing the adjusting bolts 9 and 10 from loosening. In the non-operating state shown in the drawing, the atmosphere is introduced into the vacuum chamber 21, and the power piston 23 is urged downward by the return spring 26, and the one end side surface 6 a of the lever 6 is fixed to the hexagon of the adjustment bolt 9. The valve body 4 is held in the open position by contacting the upper surface 9a of the head. When the vacuum pressure is supplied to the vacuum chamber 21 by operating the solenoid valve, the power piston 23 moves upward against the urging force of the return spring 26 due to the differential pressure between the vacuum pressure and the atmospheric pressure, and the lever 6 is moved. By turning, the other end side surface 6b of the lever 6 comes into contact with the upper surface 10a of the hexagonal head of the adjustment bolt 10, thereby holding the valve body 4 in the closed position. When the solenoid valve (not shown) is returned to the non-operating state from that state, the vacuum pressure in the vacuum chamber 21 is exhausted, the vacuum chamber 21 becomes atmospheric pressure, the power piston 23 moves downward by the urging force of the return spring 26, and the lever 6 rotates and returns to the above-mentioned inoperative state.

The exhaust pipe opening / closing valve device 1 closes the exhaust gas passage of the exhaust pipe of the engine to increase the exhaust gas pressure, thereby operating the exhaust brake and promoting the warm-up of the engine. When the pipe opening / closing device 1 is operated and the valve body 4 is in the closed position, if the passage area of the exhaust gas formed by the gap between the valve body 4 and the wall surface of the through hole 2a of the valve housing 2 is too small, the valve body is Exhaust gas pressure on the upstream side becomes excessively high, giving an excessive load to the engine and causing the engine to stop. Conversely, if the gap between the valve body 4 and the wall surface of the through hole 2a when the valve body 4 is in the closed position is too large, the rise in exhaust gas pressure will be small, and the effectiveness of the exhaust brake and engine warm-up will be poor. turn into. Therefore, when the valve element 4 is in the closed position, the valve element 4 and the through hole 2
It is important to maintain a proper gap with the wall surface a.
Further, when the exhaust pipe opening / closing valve device 1 is not operated and the valve element 4 is in the open position, it is necessary to prevent the valve element 4 from becoming a resistance to the flow of the exhaust gas. It is required that the body 4 be kept parallel to the flow of the exhaust gas. Therefore, in the conventional exhaust pipe opening / closing valve device 1, the stopping means 7, 8 provided on the bracket 5 as described above.
Are composed of adjusting bolts 9 and 10 to be screwed into the threaded portions provided on the bracket 5 and nuts 11 and 12, respectively. At the time of assembling, the screwing positions of the adjusting bolts 9 and 10 into the threaded portion of the bracket 5 are adjusted. By tightening the nuts 11 and 12, the screwing positions of the adjusting bolts 9 and 10 are fixed, and the opening position and the closing position of the valve element 4 are adjusted to be at predetermined positions. Thereby, when the valve body 4 is at the predetermined closed position during operation, the gap between the valve body 4 and the wall surface of the through hole 2a of the valve housing 2 is appropriately maintained, and when the valve body 4 is not operated, the valve body 4 is maintained at the predetermined position. When in the open position, the valve body 4 is held parallel to the axial direction of the through hole 2a.

[0005]

By the way, in the conventional exhaust pipe opening / closing valve device 1, the upper surfaces 9a and 10a of the hexagonal heads of the adjusting bolts 9 and 10 of the stopping means 7 and 8 are formed as flat surfaces. The side surfaces 6a and 6b of the lever 6 that contact the upper surfaces 9a and 10a are also formed as flat surfaces. Therefore, for example, when the valve body 4 is in the closed position during operation, the upper surface 10a of the adjustment bolt 10 and the other side surface 6b of the lever 6
7 comes into contact with either a surface contact state as shown in FIG. 7 or a point contact state at a point A closer to the rotating shaft 3 or at a point B farther from the rotating shaft 3. Therefore, when the adjustment bolt 10 is rotated and screwed into the threaded portion of the bracket 5 during assembly to move the upper surface 10a of the adjustment bolt 10 up and down to adjust the valve body 4 to stop at the predetermined closed position, the adjustment bolt 10 The contact state between the upper surface 10a of the lever 6 and the other end side surface 6b of the lever 6 changes from, for example, a point contact at the point A to a point contact at the point B via the surface contact state shown in FIG. In addition, the contact state may naturally change in the reverse order. As described above, during the adjustment work at the time of assembly, the other end side surface 6b of the lever 6 and the upper surface 10a of the adjustment bolt 10 are formed.
When the position of contact with the adjustment bolt changes, even if the adjustment bolt 10 is rotated by the same amount, the rotation angle of the lever 6 that rotates accordingly may differ depending on the position of the adjustment bolt 10 in the vertical direction. Is difficult to do. This is because the rotation angle of the lever 6 with respect to the same amount of rotation of the adjustment bolt 10 is larger when the contact position is closer to the rotation shaft 3 than when the contact position is farther away. In the valve device 1, there is a case where the rotation angle of the lever 6 with respect to the constant rotation amount of the adjustment bolt 10 may change by about 30 to 40%, so that there is a problem that the adjustment operation is difficult. The same problem also occurs when adjusting the open position of the valve element 4 to a predetermined position.

Further, in the conventional exhaust pipe opening / closing valve device 1, as described above, the upper surfaces 9a of the adjustment bolts 9, 10 are provided.
The contact between the lever 10 and the side surfaces 6a and 6b of the lever 6 may be a point contact. In this case, the contact area between the adjusting bolts 9 and 10 and the lever 6 is reduced, so that the contact portion wears out early. May progress. This adjustment bolt 9,
When the contact portion between the lever 10 and the lever 10 becomes worn, the valve body 4
The closed position and the open position of the valve change.
The gap between the valve and the wall of the through hole 2a of the valve housing 2 becomes small, and the exhaust gas pressure becomes too high, and the engine may stop. Therefore, the adjustment bolts 9, 1
0 and the side surfaces 6a and 6b of the lever 6
And the like must be subjected to a wear-resistant treatment such as heat treatment.

The present invention has been made in view of such circumstances, and has as its object to provide an exhaust pipe opening / closing valve device capable of easily and accurately adjusting a closing position and an opening position of a valve body and achieving cost reduction. It is to provide.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a valve housing provided in the middle of an exhaust pipe of an engine and forming a part of the exhaust pipe, and a valve for the valve housing. A rotating shaft rotatably supported by the housing, a valve body fixed to the rotating shaft to open and close the exhaust gas passage of the exhaust pipe, and fixed to one end of the rotating shaft;
An exhaust having a lever that is rotated by an actuator fixed to the valve housing via a bracket, and a stop that engages with the lever and restricts the open position and the closed position of the valve body to predetermined positions; In the pipe opening / closing valve device, an engagement surface of the lever that engages with the stopping means at at least one of the open position and the closed position is formed in an arc shape.

Further, the invention of claim 2 is characterized in that the lever is formed of a plate material to form a bent portion, and a side surface of the bent portion is the engaging surface for engaging with the stopping means. And

[00010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway front view showing an example of an embodiment of an exhaust pipe opening / closing valve device according to the present invention, and FIG. 2 is a side sectional view thereof. In addition, FIG.
The same components as those of the conventional exhaust pipe opening / closing valve device 1 shown in FIGS. 6 and 7 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Exhaust pipe opening / closing valve device 1 shown in FIGS. 1 and 2
Is provided in the middle of the exhaust pipe of the engine (not shown),
A valve housing 2 having a through hole 2a forming a part of an exhaust gas passage, a rotary shaft 3 rotatably supported by the valve housing 2 via a bearing member, and a bolt substantially at the center of the rotary shaft 3 And a disc-shaped valve body 4 that opens and closes the through-hole 2a, one end of which is fixed to one end 3a of the rotating shaft 3 and the other end of which is fixed to the housing 2 via a bracket 5. Lever 6 connected to the actuator 20 and rotated by the operation of the actuator 20, and a stopping means 7 which engages with the lever 6 to regulate the open position and the closed position of the valve body 4 to predetermined positions, respectively. , 8.

A bracket 5 is provided on a side surface 2b of the valve housing 2 provided with one end 3a of the rotating shaft 3 protruding outside.
The actuator 20 is mounted on the outer surface of the bracket 5 so that the output rod 25 is located inside the bracket 5. The distal end 25a of the output rod 25 formed from a plate is provided with a pin hole 25b for connecting to the lever 6, while the lever 6 made of a plate fixed to one end 3a of the rotating shaft 3 has a part. Is formed, and a U-shaped portion 6c is formed. The U-shaped portion 6c is provided with a pin hole 6d for connecting to the output rod 25. The pin 27 is inserted through both pin holes 6d and 25b in a state of being inserted between the pins 6c. Thereby, the output rod 25 and the lever 6 are rotatably connected to each other.

The actuator 20 is different from the conventional exhaust pipe opening / closing valve device 1 in that the output rod 25 is formed in a plate shape as described above, and the clevis 24 fixed to the end thereof is deleted. As described above, the lever 6 is provided with the U-shaped portion 6c, and the other structure is the same as the conventional one. Stop means 7, 8 provided on the bracket 5
Among them, the configuration of the stopping means 8 for regulating the closed position of the valve body 4 is as follows.
It is the same as the conventional one, and is composed of an adjustment bolt 10 screwed into a screw portion provided on the bracket 5 and a nut 12 for preventing the adjustment bolt 10 from loosening. On the other hand, the stop means 7 differs from the conventional one in that the adjustment bolt 9 and the nut 11 are deleted,
The side surface 5a of the bracket 5 serves as a stopping means 7. Therefore, in this embodiment, the stopping means 8 for regulating the closed position of the valve element 4 has an adjusting function for adjusting the position as in the prior art, but the stopping means 8 for regulating the open position of the valve element 4. 7
Does not have an adjustment function for adjusting the position unlike the conventional one.

As shown in FIG. 4, the lever 6 is made of a plate material and has one end 3 on which a two-sided chamfered portion of the rotary shaft 3 is formed.
and a substantially oval hole 6e into which a is inserted and fixed, a U-shaped portion 6c formed by folding a part of a plate material, and a pin hole 6d through which a pin 27 provided in the U-shaped portion 6c is inserted. The other end side surface 6b formed by bending the other end portion at a right angle so as to be engaged with the bolt 10, and the side surface 5 of the bracket 5
and one end side end surface 6a formed by bending one end portion at a right angle so as to abut and engage with the end surface 6a. Further, the other end side surface 6b formed by bending the other end portion at a right angle has an arcuate shape whose axis is parallel to the rotation axis.
When it comes into contact with the upper surface 10a of the hexagonal head, a line contact is made. As described above, the lever 6 is formed of a plate material and formed into a shape that can be formed by pressing or the like, so that the processing is facilitated, and since the U-shaped portion 6c instead of the clevis 27 is provided, no clevis is required. And the number of parts can be reduced. Furthermore, since the portions that come into contact with the stopping means 7 and 8 are formed by bent portions, the stopping means 7 and 8 are in line contact, so that the abrasion of the contacting parts due to operation or the like does not occur. Therefore, abrasion resistance treatment such as heat treatment of the contact portion can be omitted, and cost can be reduced.

In the above-described embodiment, when not operating, the one end side surface 6a of the lever 6 abuts against the side surface 5a of the bracket 5, and the open position of the valve body 4 is held. Moves upward, the lever 6 rotates, and the other side surface 6b of the lever 6 is moved to the upper surface 10a of the adjustment bolt 10.
And the closed position of the valve body 4 is maintained. In this closed position, as shown in FIG. 3, the other end side surface 6b is in line contact with substantially the center of the upper surface 10a, and the adjusting bolt 10 is rotated to adjust the closed position to a predetermined position during assembly. Even if the upper surface 10a is moved up and down, the contact position with the other end side surface 6b hardly changes. Therefore, since the rotation angle of the lever 6 with respect to the rotation amount of the adjustment bolt 10 is maintained substantially constant regardless of the vertical position of the adjustment bolt 10, the closed position of the valve body 4 is adjusted to a predetermined position during assembly. At this time, the closed position can be easily and accurately adjusted to a predetermined position. In this embodiment, even if the opening position of the valve element 4 is slightly shifted, the stopping means 7 has a small influence on the flow of the exhaust gas.
The function to adjust the open position of the has been deleted. Other configurations and operations are the same as those of the related art, and a description thereof will be omitted.

The technology of the present invention is not limited to the technology in the above-described embodiment, but can be modified or changed based on the technical idea of the present invention. For example,
In this embodiment, the actuator 20 is operated by supplying and discharging the vacuum pressure. However, the present invention is not limited to this, and the actuator 20 may be operated using compressed air pressure, liquid pressure, or the like. Further, although the adjusting function is deleted from the stopping means 7 for regulating the opening position of the valve body 4, the stopping means 7 may have the same configuration as that of the related art to have the adjusting function. In this case, the shape of the one end side surface 6a of the lever 6 may be formed in an arc shape similarly to the other end side surface 6b, and in this case, the open position of the valve body 4 is set to the predetermined position similarly to the closed position. Can be easily and accurately adjusted.

[0017]

As is apparent from the above description, according to the exhaust pipe opening / closing valve device of the present invention, since the engaging surface of the lever contacting the stopping means is formed in an arc shape, the stopping means is adjusted to adjust the valve. When adjusting the closed position or the open position of the body to the predetermined position, the contact position between the stopping means and the lever hardly changes, and the adjustment can be easily and accurately performed.

Further, since the lever is formed of a plate material and a part thereof is bent to form an arc-shaped side surface at the part, the contact between the upper surface of the adjusting bolt and the lever is in linear contact. In addition, the length of the bent portion can be easily changed. Therefore, there is no possibility that the contact portion between the adjustment bolt and the lever is worn, and it is not necessary to perform a wear-resistant treatment such as a heat treatment on the contact portion, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an exhaust pipe opening / closing valve device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the exhaust pipe opening / closing valve device shown in FIG.

FIG. 3 is a side view of the exhaust pipe opening / closing valve device shown in FIG. 1 with a part cut away, showing a positional relationship between a lever and a stopping means when the valve body is in an operating state in a closed position. is there.

FIG. 4 is a front view showing a shape of a lever of the exhaust pipe opening / closing valve device according to the embodiment of the present invention shown in FIG. 1;

FIG. 5 is a front sectional view showing a conventional exhaust pipe opening / closing valve device.

6 is a partially cutaway side view of the exhaust pipe opening / closing valve device shown in FIG. 5;

7 is a partially cutaway side view of the exhaust pipe opening / closing valve device shown in FIG. 5, showing a positional relationship between a lever and a stopping means when the valve body is in an operating state in a closed position. is there.

[Explanation of symbols]

 Reference Signs List 2 valve housing 2a through hole 3 rotating shaft 4 valve body 5 bracket 6 lever 6a one end side surface 6b other end side surface 6c U-shaped portion 7 stopping means (for open position) 8 stopping means (for closed position) 9 adjusting bolt 10 Adjusting bolt 10a Upper surface 20 Actuator 23 Power piston 25 Output rod

Claims (2)

[Claims] A valve housing provided in the middle of an exhaust pipe of the engine and forming a part of the exhaust pipe; a rotary shaft rotatably supported by the valve housing; and a rotary shaft fixed to the rotary shaft. A valve body that opens and closes an exhaust gas passage of an exhaust pipe, a lever that is fixed to one end of the rotation shaft, and is rotated by an actuator that is fixed to the valve housing via a bracket, and is engaged with the lever. In an exhaust pipe opening / closing valve device having stop means for restricting an open position and a closed position of the valve body to a predetermined position, the exhaust pipe engages with the stop means at at least one of the open position and the closed position. An exhaust pipe opening / closing valve device, wherein an engagement surface of the lever is formed in an arc shape. 2. The device according to claim 1, wherein the lever is formed of a plate material to form a bent portion, and a side surface of the bent portion is the engaging surface that engages with the stopping means. Exhaust pipe opening and closing valve device.