JP2000204973A - Exhaust brake valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a stopper bolt with which a lever makes contact during opening, to eliminate the need for a burring on a bracket for mounting a stopper bolt and screw hole machining applied on the spot, and to reduce a cost. SOLUTION: This valve device is provided with an exhaust brake valve 16 having a valve stem 20 to rotatably support the bearing part of a valve housing 17 and a butterfly valve element 21 fixed on the valve stem 20. Through the operation of an actuator 24 coupled to a valve housing 17 through a bracket 22, the valve device is brought into a closed state through a lever 23 mounted on the valve stem 20. The lever 23 is provided with an overhang part overhanging from a lever body, and the overhang part is provided with a bent part molded by bending a tip. During the opening of the exhaust brake valve 16, the engaging flat of the bent part is brought into contact with the inner surface of the side plate part 58 of the bracket 22 to effect opening positioning of the valve element 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust brake valve device which is disposed in a discharge passage of exhaust gas discharged from an engine of a large-sized automobile or the like and is used for braking during running or the like. is there.

[0002]

2. Description of the Related Art FIG. 10 is a partially cutaway front view of a conventional exhaust brake valve device, FIG. 11 is a partially cutaway side view of an essential part thereof, and FIG. 12 is a partial plan view of FIG. .
In the conventional exhaust brake valve 1, a circular butterfly valve element 6 is mounted on a valve shaft 5 composed of a pair of spindles Sp and Sp rotatably supported by bushes 3 and 4 in a bearing portion of a valve housing 2. The valve housing 2 is supported by a bracket 7 attached to one end.

In the exhaust brake valve 1, the edge of the notch 6a of the valve body 6 is press-fitted into a mounting groove 5a along the diametrical direction of each tip of a pair of spindles Sp and Sp. Installed. The exhaust brake valve device includes a negative pressure actuator 8, and the actuator 8 is operated by a negative pressure supplied from a negative pressure source (not shown) to a negative pressure chamber 11 of the actuator 8 via a supply / discharge pipe 9. By actuation of the actuator 8, the valve body 6 is closed by rotating the lever 13 attached to the outer end of the valve shaft 5, and the valve body 6 is opened by returning by the urging force of the return spring 12. It is configured.

When the valve is opened and closed, the movement of the lever 13 is controlled by the heads 14 of the two stopper bolts 14 and 15.
The engagement surfaces 13a and 13b are regulated and positioned by contact with the engagement surfaces 13a and 13b, respectively. Stopper bolt 1
4 and 15 are induction hardened to prevent abrasion, and bulging portions 7a formed on the bracket 7 by burring.
Are screwed into the screw holes, and are each prevented from rotating by nuts 10.

[0005]

However, in the above-mentioned conventional exhaust brake valve device, the lever 13 is not opened when the valve is opened.
An expensive induction hardened stopper bolt 14 for positioning and a nut 10 for preventing the rotation of the stopper bolt are also required.
In this case, it is necessary to form a, and there is a drawback that processing and assembling are troublesome and cost is high.

In view of the above problems, the present invention eliminates a stopper bolt which a lever comes into contact with when a valve is opened and a nut which is screwed to the stopper bolt, and forms a bulging portion by burring a bracket for mounting the stopper bolt. It is an object of the present invention to provide an exhaust brake valve device that can eliminate the need for machining a screw hole at that location and reduce costs.

[0007]

In order to solve the above problems, the present invention provides a valve shaft rotatably supported by a bearing portion of a valve housing, and a butterfly type valve body fixed to the valve shaft. An exhaust brake valve device having an exhaust brake valve having a bracket and being closed by a lever attached to the valve shaft by operation of an actuator coupled to the valve housing with a bracket, wherein the lever protrudes from a lever body. A protruding portion is provided, and when the exhaust brake valve is opened, the protruding portion abuts on the bracket to perform the valve opening positioning of the valve body. Further, in the present invention, a bent portion is provided by bending the tip of the overhang portion, and when the exhaust brake valve is opened, an engagement plane of the bent portion comes into contact with the bracket and the bent portion is engaged with the bracket. Preferably, the valve body is positioned for opening the valve.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway front view showing an exhaust brake valve device according to an embodiment of the present invention, FIG. 2 is a side view showing an exhaust brake valve device by cutting the actuator of FIG. 1 longitudinally, and FIG. FIG. 4 is a longitudinal sectional view when the exhaust brake valve is closed. This exhaust brake valve device includes an exhaust brake valve 16 also serving as a warming device, and a butterfly type valve body is mounted on a valve shaft 20 rotatably supported by bushes 18 and 19 in a bearing portion of a valve housing 17. 21 is attached.

In the exhaust brake valve device, a lever 23 attached to the shaft end of the valve shaft 20 is connected to a bracket 22.
The valve body 21 is rotated by the operation of the negative pressure type actuator 24 coupled to the valve housing 17 to close the valve body 21 and apply the exhaust brake. Further, the exhaust brake valve device is provided with both overhanging portions 61 and 62 projecting from the lever main body 60 of the lever 23 attached to the valve shaft 20, and one of the overhanging portions 61 is formed by bending and forming a tip. Part 61a
When the exhaust brake valve 16 is opened, the engagement flat surface 61b of the bent portion 61a abuts on the bracket 22, and the valve body 21 is positioned for valve opening.

The valve housing 17 is provided with bosses 31 and 32 protruding from the cylindrical housing body 30 so as to extend in diameter.
Bushings 18, 19,
The valve shaft 20 is rotatably supported via the. In the valve housing 17, a square flange 33 and a deformed flange 34 shown in FIG. 1 are integrally provided on the housing main body 30, and a plurality of screw holes 33a, 34a formed in both flanges 33, 34 are provided. It is attached to a predetermined location using a bolt (not shown) to be screwed.

The valve housing 17 is provided with a bolt 36 in a screw hole 35 formed vertically in the end face of the one boss 31.
Is screwed, whereby the mounting bracket 22 of the actuator 24 is fixed.

FIG. 4 is an exploded perspective view showing the valve shaft and the valve element. The valve shaft 20 includes an engaging portion 41 that engages with the trapezoidal portion 50 and the semi-cylindrical portion 51 of the valve body 21, and a positioning portion at both ends of the engaging portion 41 that determines the position of the valve body 21 in the axial direction. And the support receiving portions 43 and 44 supported by the bushes 18 and 19 are integrally formed, and a projecting portion 45 following the support receiving portion 43 near the actuator 24 protrudes from the valve housing 17 to be integrated. It is provided in.

The valve shaft 20 has a plurality of screw holes 41a formed in the engaging portion 41, a male screw 45a is engraved at the tip of the projecting portion 45, and a bolt 46 is screwed into the screw hole 41a. The valve body 21 is attached, and the two-way portion 4
The lever 23 is attached to 5b, and the lever 23 is prevented from coming off by a nut 47 (see FIG. 2) screwed into the male screw 45a. As shown in FIG. 3, the valve shaft 20 is arranged so that the center C is eccentric with respect to the center line CL of the valve housing 17, and utilizes the exhaust gas pressure received by the pressure receiving surface of the valve body 21 during the valve opening operation. It is supposed to.

The valve body 21 is formed by pressing a plate-shaped material.
A trapezoidal section 50 having a trapezoidal cross section formed by bending;
A semi-cylindrical portion 51 having a semi-cylindrical cross section is provided on both ends of the trapezoidal portion, and a through-hole 50 a is formed in the trapezoidal portion 50 at a position corresponding to the screw hole 41 a of the valve shaft 20. Then, as shown in FIG. 5, the valve body 21 is in a state where the contact points between the outer periphery of the engaging portion 41 of the valve shaft 20 and the inner surface of the trapezoidal portion 50 are located at three places at intervals in the circumferential direction. The bolt 46 inserted into the through hole 50a is screwed into the screw hole 41a to be fixedly attached to the valve shaft 20.

As shown in FIG. 3, when the valve element 21 is closed, the valve between the inner peripheral surface of the housing body 30 at the position farthest from the valve shaft 20 and the outer periphery of the valve element 21 itself. The gap e is set to a predetermined value.

The bracket 22 includes a valve connecting plate 54
And a pair of side plate portions 55 which are bent at substantially right angles from both ends thereof and are continuous with each other, and an upper end plate portion 56 which extends perpendicularly to the valve coupling plate portion 54 and the both side plate portions 55. A screw hole is formed in the bulging portion 55a formed by burring the one side plate portion 55, a square hole 56a is formed in the center of the upper end plate portion 56, and the actuator 24 is attached to the upper end plate portion 56. I have. The bracket 22 is attached to the valve housing by screwing a bolt 36 inserted through a through hole (not shown) formed in the valve coupling plate portion 54 into the screw hole 35, and the stopper bolt 15 projects inward from the screw hole with burring. It is screwed.

As shown in FIGS. 7 and 8, the lever 23 has a lever main body 60 and a double-projecting portion 61, which protrudes along a direction inclined at an acute angle to the lever main body 60.
62, a modified hole 23a fitted on the outer periphery of the two-way portion 45b of the valve shaft 20 and a joint hole 23b into which the pin 76 is inserted are formed. A bent portion 61a is formed by bending at a right angle. The bent portion 61a is for determining the open position of the valve body 21 by the engagement flat surface 61b hitting the inner surface of the one side plate portion 55 of the bracket 22 when the exhaust brake valve 16 is opened. The other overhang portion 62, when the valve is closed,
This is for determining the closing position of the valve body 21 by hitting the tip of the stopper bolt 15.

The actuator 24 includes a return spring 26,
A diaphragm 67 in the shell 66, a diaphragm plate 68 and a retainer 69 sandwiching the center of the diaphragm 67 are provided. An output rod 70 is connected to the center of the diaphragm 67, and a supply / discharge pipe 73 is integrated with the head of the shell 66. It protrudes.

The shell 66 includes a first shell member 71,
An annular quadrangular projection 7 is provided by combining the second shell member 72 with the outer peripheral edge of the diaphragm 67 sandwiched between the two shell members 71, 72 and protruding from the second shell member 72.
2a is inserted into a square hole 56a of the upper end plate 56, and the second shell member 72 is attached to the flat upper end plate 56 of the bracket 22 by welding. The shell 66 is
Negative pressure chamber 2 is formed by partitioning the inside with diaphragm 67.
5 are formed. The supply and discharge pipe 73 is used to reduce pressure loss.
The inner diameter is made as large as possible, is formed integrally with the first shell member 71, and has a tapered portion 73a having a radius of curvature R at a connection portion.

The diaphragm 67 has a central portion sandwiched between a diaphragm frame plate 68 and a retainer 69.
The head of the output rod 70 is connected via a diaphragm plate 68 and a retainer 69. Output rod 70
The clevis 75 at the tip protruding toward the lever 23 is pin-joined to the lever 23 with a pin 76, and the engaging flat surface 61b of the bent portion 61a of the lever 23 abuts the side plate 55 of the bracket 22. As a result, the movement at the time of valve opening is restricted, and the movement at the time of valve closing is reduced by the tip of the overhang portion 62 of the lever 23 contacting the inward tip of the stopper bolt 15 projecting inward from the bracket 22. Regulated.

When the negative pressure is supplied from a negative pressure source such as a negative pressure tank (not shown) and the pressure in the negative pressure chamber 25 decreases in a non-operating state, the inner surface of the head of the shell 66 and the diaphragm plate 68, the negative pressure chamber 25 is deformed so as to be reduced against the urging force of the return spring 26, and the output rod 50 is moved in, and the valve body 21 is closed by this operation. When the negative pressure is removed from the pressure chamber 25, the state returns to the state shown in the figure by the urging force of the return spring 26 and the torque based on the pressure of the exhaust gas acting on the pressure receiving surface of the valve element 21. 21 opens.

When the exhaust brake valve device is operated, a negative pressure is supplied from the negative pressure source to the negative pressure chamber 25 through the supply / discharge pipe 73, and the diaphragm 67 of the actuator 24 resists the negative pressure against the urging force of the return spring 26. The chamber 25 is displaced in the direction of contraction, and at the same time, the output rod 50 moves into the shell 66 to rotate the lever 23, close the valve body 21, and operate the exhaust brake.

When the operation is released, the negative pressure is discharged from the negative pressure chamber 25 through the supply / discharge pipe 73, the diaphragm 67 returns to the state shown in FIG. 2 by the urging force of the return spring 26, and at the same time, the output rod 70 moves out. , The lever 23 is rotated,
The valve body 21 is opened.

In the case of the above embodiment of the present invention, the lever 2
Reference numeral 3 denotes a lever main body 60 and a double-projecting portion 6 which protrudes along an inclined direction at an acute angle with respect to the lever main body 60.
1 and 62, and a bent portion 61a is formed at the end of one of the overhang portions 61 by bending substantially at a right angle. When the bent portion 61a is opened, the exhaust brake valve is opened.
The valve body 21 contacts the inner surface of the side plate 55 of the bracket 22.
Since the opening position is determined, it is possible to omit the need for the induction bolt hardening and the expensive valve opening side stopper bolt 14 shown in FIG. Since the valve shaft 20 has the two flanges 42 and 42 and the valve body 21 has the semi-cylindrical portions 51 and 51, FIG.
As shown in FIG. 5, it is possible to reduce the leakage of the exhaust gas G from passing through the lateral holes 31a and 32a in the bosses 31 and 32 of the valve housing 17 shown in FIG.

Further, by inserting the annular square projection 72a into the square hole 56a of the upper end plate 56, the mutual positioning of the shell 66 and the bracket 22 is easy, and the supply / discharge tube 73 is connected to the first shell member 71. While projecting together,
By joining the second shell member 72 and the bracket 22 by welding, the cost can be reduced. The supply / discharge tube 73 has an inner diameter as large as possible and is formed integrally with the first shell member 71. Since the connecting portion has the tapered portion 53a having the radius of curvature R, the pressure loss can be reduced and the responsiveness can be improved.

The present invention is not limited to the above embodiment, and various modifications and changes are possible. For example, instead of providing the flange 42 integrally with the valve shaft 20, the flange 42 may be formed by inserting and press-fitting a separate ring-shaped member as shown in FIG. In this case, the valve shaft 2
It is desirable to provide a stepped surface 20a at 0 and position the ring-shaped member in contact with the stepped surface 20a.

[0027]

The present invention has the following effects. The lever is provided with an overhanging portion extending from the lever body, and when the exhaust brake valve is opened, the overhanging portion abuts on the bracket to position the valve body so that the lever abuts when the valve is opened. The stopper bolt and the nut to be screwed to the stopper bolt are omitted, and the formation of a bulging portion by burring the bracket for mounting the stopper bolt and the need for drilling a screw hole at the portion are unnecessary, and the cost can be reduced. Further, a bent portion is provided in the overhanging portion by bending the tip, and when the exhaust brake valve is opened, the engagement plane of the bent portion abuts on the bracket to position the valve body for valve opening. As a result, the bent portion is brought into contact with the bracket, so that the surface pressure of the lever is reduced and uneven wear is prevented.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing an exhaust brake valve device according to an embodiment of the present invention.

FIG. 2 is a side view showing an exhaust brake valve device by cutting the actuator of FIG. 1 longitudinally.

FIG. 3 is a longitudinal sectional view when the exhaust brake valve of FIG. 2 is closed.

FIG. 4 is an exploded perspective view showing a valve shaft and a valve body according to the embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a relationship between a valve shaft and a valve body according to the embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of the exhaust brake valve according to the embodiment of the present invention.

FIG. 7 is a side view showing the lever according to the embodiment of the present invention.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a partial cross-sectional view showing a modification of the embodiment of the present invention.

FIG. 10 is a partially cutaway front view of a conventional exhaust brake valve device.

FIG. 11 is a partially cutaway side view of FIG. 10;

FIG. 12 is a plan view showing one side of a part of FIG. 10;

[Explanation of symbols]

 Reference Signs List 16 Exhaust brake valve 17 Valve housing 18, 19 Bush 20 Valve shaft 21 Valve body 22 Bracket 23 Lever 24 Actuator 25 Negative pressure chamber 26 Return spring 42 Flange 50 Trapezoidal part 51 Semi-cylindrical part 55 Side plate part 55a Swelling part 60 Lever body 61 Overhang portion 61a Bent portion 61b Engagement plane

Claims (2)

[Claims] 1. An exhaust brake valve having a valve shaft rotatably supported by a bearing portion of a valve housing, and a butterfly-type valve body fixed to the valve shaft. The exhaust brake valve is connected to the valve housing with a bracket. In an exhaust brake valve device that is closed by a lever attached to the valve shaft by operation of an actuator, the lever is provided with a protruding portion that protrudes from a lever body, and when the exhaust brake valve is opened, An exhaust brake valve device, wherein the overhanging portion abuts on the bracket to perform the valve opening positioning of the valve body. 2. The projecting portion has a bent portion formed by bending a tip thereof, and when the exhaust brake valve is opened, an engagement plane of the bent portion comes into contact with the bracket to thereby provide the valve. 2. The valve opening positioning of the body is performed.
An exhaust brake valve device according to item 1.