Exhaust pipe shut-off valve device

Abstract

To provide an exhaust pipe opening and closing valve device that can reduce the occurrence of diaphragm wear and cracking. [Solution] The exhaust pipe opening and closing valve device comprises a valve housing 310 provided in the middle of the exhaust pipe and having an inner circumferential hole forming part of the exhaust pipe, a valve 320 supported so as to be able to open and close the inner circumferential hole 330 of the valve housing, an actuator 100 for rotating the valve, and a transmission unit for transmitting the output of the actuator to the valve, wherein the transmission unit comprises an output rod 210, a clevis 230 connected to the rod, a lever 260 connected to the clevis, and the lever and the valve are connected, the clevis and the lever are connected by a connecting pin 240, the clevis is able to support the connecting pin, and the lever has a pin insertion hole that is able to support the connecting pin, and the insertion hole is in the shape of an elongated insertion hole.

Description

Technical Field

[0001] The present invention relates to an exhaust brake valve device that can be used in an exhaust brake system that is provided in the middle of an exhaust pipe of a vehicle and performs exhaust braking by restricting the passage in the exhaust pipe to apply a load to the engine, or in a heating system that warms the cooling water of the engine to heat the vehicle, or in a regeneration system of a diesel particulate filter (hereinafter referred to as "DPF").

Background Art

[0002] Conventionally, in an exhaust pipe opening / closing valve device provided in the middle of an exhaust pipe of a vehicle, there has been disclosed one in which a rotary shaft to which a valve body is fixed is inserted into an inner peripheral hole of a valve housing that forms a part of the exhaust pipe (see Patent Document 1).

[0003] An example of a conventional configuration of an exhaust pipe opening / closing valve device used in the exhaust brake system, the heating system, or the DPF regeneration system will be described with reference to FIG. 5. FIG. 5a is a front view of the exhaust pipe opening / closing valve device, FIG. 5b is a view when the valve 320 is fully open, FIG. 5c is a view at an intermediate position of the valve 320, and FIG. 5d is a side view with a part cut away when the valve 320 is fully closed. A valve housing 310 is provided in the middle of the exhaust pipe of the engine, and its inner peripheral hole 330 forms a part of the exhaust pipe. A rotary shaft 270 is rotatably supported across the inner peripheral hole 330 of the valve housing 310.

[0004] One end of the rotary shaft 270 is rotatably supported by a bearing disposed in a shaft hole formed in the valve housing 310, and the other end side passes through the shaft hole of the valve housing 310 and is rotatably supported by a bearing, and its tip extends toward the bracket 220 to which the valve housing 310 is attached.

[0005] A butterfly-type valve 320 is fixed to a portion of the rotary shaft 270 within the inner peripheral hole 330, and the rotation of the rotary shaft 270 opens and closes the inner peripheral hole 330 of the valve housing 310 that forms a part of the exhaust pipe.

[0006] An actuator 100 is mounted on the bracket 220 with its output rod 210 facing in a direction perpendicular to the rotation axis 270. A clevis 230 is fixed to the tip of the output rod 210 of the actuator 100, while a lever 260 is fixed to the tip of the rotation axis 270. Connecting pins 240 are inserted into pin insertion holes formed in the clevis 230 and the lever 260, respectively, so that the clevis 230 and the lever 260 are connected so as to be able to rotate relative to each other. The portion of the output rod 210 where the clevis 230 and the lever 260 of the rotation axis 270 are connected so as to be able to rotate relative to each other is housed in a lever chamber covered by the bracket 220 and a cover not shown.

[0007] When the actuator 100 is activated and the output rod 210 moves, the rotating shaft 270 rotates via the clevis 230, connecting pin 240, and lever 260, causing the butterfly-type valve 320 to open and close the inner circumferential hole 330 of the valve housing 310. The rotation of the lever 260 due to the forward and backward movement of the output rod 210 is restricted by stopper surfaces provided on both sides of the lever 260 contacting two bolts fixed to the bracket 220.

[0008] The actuator 100 is a negative-pressure actuator, and the inside of the shell 120 is divided into a negative-pressure chamber 130 and an atmospheric chamber 150 by a diaphragm 160 and a diaphragm plate 165, with the negative-pressure chamber 130 connected to a negative-pressure source (not shown) via a supply / discharge pipe 110. When negative pressure is introduced into the negative-pressure chamber 130, the diaphragm plate 165 and the output rod 210 move upward in the figure (Figure 5d), and when the negative pressure is discharged from the negative-pressure chamber 130, the diaphragm plate 165 is returned to the shown position by a return spring 140 (Figure 5b).

[0009] As shown in Figure 5b, when the exhaust pipe valve device is not in operation, the diaphragm plate 165 of the actuator 100 is pushed by the return spring 140, so that one stopper surface of the lever 260 contacts the head of one stopper bolt 290 fixed to the bracket 220, and the butterfly-type valve 320 is held in the fully open position.

[0010] When the valve is in operation, negative pressure is introduced into the negative pressure chamber 130 of the actuator 100. The pressure difference with the atmosphere pulls in the diaphragm plate 165, causing the lever 260 to rotate via the output rod 210. The other stopper surface 282 then contacts the other stopper bolt 290, causing the butterfly-type valve 320 to move to the fully closed position via the state shown in Figure 5c. When the valve returns to its original position, negative pressure is released from the negative pressure chamber 130. The diaphragm plate 165 and the output rod 210 are pushed towards the atmosphere chamber 150 by the biasing force of the return spring 140, returning to the non-operating position shown in Figure 5b. In this way, when the exhaust pipe valve device operates, the pin insertion hole of the clevis 230, the connecting pin 240, and the pin insertion hole of the lever 260 rotate relative to each other. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Japanese Patent Publication No. 2017-160880 [Overview of the project] [Problems that the invention aims to solve]

[0012] In the conventional exhaust pipe opening and closing device shown in Figure 5, a lever 260, which is inserted into a rotating shaft 270 fixed to a bracket 220 and is rotatable, is engaged with a clevis 230 fixed to the tip of an output rod 210 by a connecting pin 240. As described above, the output rod 210 moves up and down while oscillating due to the rotation of the lever 260, causing the diaphragm 160 to tilt as shown by the axis 420, resulting in deformation at the deformation part 410. This leads to the problem that the rubber material of the diaphragm 160 is prone to wear and cracking. The present invention aims to provide an exhaust pipe opening and closing valve device that can reduce wear and cracking of the diaphragm 160. [Means for solving the problem]

[0013] An exhaust pipe shut-off valve device in one embodiment of the present invention is A valve housing is provided in the middle of the exhaust pipe and has an inner circumferential hole that forms part of the exhaust pipe, A valve is supported so as to be able to open and close the inner circumferential hole of the valve housing, An actuator for rotating the valve, A transmission unit that transmits the output of the actuator to the valve, Equipped with, The transmission unit comprises an output rod, a clevis connected to the output rod, a lever connected to the clevis, and a valve connected to the lever. The clevis and the lever are connected by a connecting pin. The lever is provided with an elongated insertion hole capable of supporting the connecting pin. It is characterized by the following:

[0014] Furthermore, in another embodiment, the exhaust pipe opening and closing valve device is characterized in that the elongated insertion hole has one end and the other end, the valve housing has a plurality of stopper portions, the lever has a plurality of stopper surfaces that contact the stopper portions, and when the stopper surfaces of the lever are in contact with the stopper portions, the connecting pin is positioned on the one end side of the elongated insertion hole.

[0015] In addition, the exhaust pipe opening / closing valve device in another embodiment is configured such that the output rod is movable by a bearing having an air passage. This is the gist of the invention.

Effect of the Invention

[0016] The exhaust pipe opening / closing valve device according to the present invention has an effect of reducing wear and cracks in the diaphragm 160.

Brief Description of the Drawings

[0017] [Figure 1(a)] The front view of the exhaust pipe opening / closing valve device of the present embodiment is shown. [Figure 1(b)] The side view of the exhaust pipe opening / closing valve device of the present embodiment when the valve is fully open is shown. [Figure 1(c)] The side view of the exhaust pipe opening / closing valve device of the present embodiment when the valve is in the intermediate position is shown. [Figure 1(d)] The side view of the exhaust pipe opening / closing valve device of the present embodiment when the valve is fully closed is shown. [Figure 2] The lever having the long hole insertion hole of the present embodiment is shown. [Figure 3] The bearing of the present embodiment is shown. [Figure 4] The state where the output rod is attached to the bearing of the present embodiment is shown. [Figure 5] The front view and side view of the exhaust pipe opening / closing valve device of the prior art are shown.

Mode for Carrying Out the Invention

[0018] FIG. 1(a) is a longitudinal sectional view of the exhaust pipe opening / closing valve device 1, FIG. 1(b) is a view when the valve 320 is fully open, FIG. 1(c) is a view when the valve 320 is in the intermediate position, and FIG. 1(d) is a side view of a part in cross section when the valve 320 is fully closed. A valve housing 310 is provided in the middle of the exhaust pipe of the engine, and its inner peripheral hole 330 constitutes a part of the exhaust pipe. A rotating shaft 270 is rotatably supported across the inner peripheral hole 330 of the valve housing 310.

[0019] The rotating shaft 270 is rotatably supported at one end by a bearing positioned in a shaft hole formed in the valve housing 310, and at the other end, it is rotatably supported by a bearing that passes through the shaft hole of the valve housing 310, with its tip extending toward the bracket 220 to which the valve housing 310 is attached.

[0020] A butterfly-type valve 320 is fixed to the portion of the rotating shaft 270 within the inner circumferential hole 330, and the rotation of the rotating shaft 270 opens and closes the inner circumferential hole 330 of the valve housing 310, which constitutes part of the exhaust pipe.

[0021] An actuator 100 is mounted on the bracket 220 with its output rod 210 facing in a direction perpendicular to the rotation axis 270. A clevis 230 is fixed to the tip of the output rod 210 of the actuator 100, while a lever 260 is fixed to the tip of the rotation axis 270. Connecting pins 240 are inserted into pin insertion holes formed in the clevis 230 and the lever 260, respectively, so that the clevis 230 and the lever 260 are connected so as to be able to rotate relative to each other. The portion of the output rod 210 where the clevis 230 and the lever 260 of the rotation axis 270 are connected so as to be able to rotate relative to each other is housed in a lever chamber covered by the bracket 220 and a cover.

[0022] Figure 3 shows the bearing 170. Figure 3a is a top view of the bearing 170. Figure 3b is a bottom view of the bearing 170. Figures 3c and 3e are perspective views of the bearing 170. Figure 3d is a side view of the bearing 170. The bearing 170 is positioned in the middle of the output rod 210 of the actuator 100, and the output rod 210 and the bearing 170 are slidably assembled.

[0023] The bearing 170 may be roughly cylindrical or rectangular. The bearing 170 has an insertion hole 171 in its approximate center, through which the output rod 210 can slide. It also has multiple air passages 172 surrounding the insertion hole 171, as well as a flange 174 and a notch 176. The exhaust pipe opening / closing valve device 1, by having the bearing 170, suppresses radial oscillation of the output rod 210 and suppresses the occurrence of deformation 410 of the diaphragm 160, and by having the air passages 172, it has the effect of being able to take in outside air into the atmospheric chamber 150. The shape of the air passages 172 may be spline-like, but they may also be small-diameter round holes or polygonal through holes. By providing the air passages 172 in the bearing 170 at the point where it contacts the output rod 210, the frictional resistance between the bearing 170 and the output rod 210 can be reduced, and the output rod 210 can be cooled. Furthermore, the notch 176 facilitates resin molding and prevents the bearing 170 from rotating by contacting other components.

[0024] When the actuator 100 is activated and the output rod 210 moves, the rotating shaft 270 rotates via the clevis 230, connecting pin 240, and lever 260, causing the butterfly-type valve 320 to open and close the inner circumferential hole 330 of the valve housing 2. The rotation of the lever 260 due to the forward and backward movement of the output rod 210 is restricted by stopper surfaces 282 provided on both sides of the lever 260, which contact two stopper bolts 290a and 290b fixed to the bracket 220. The positions of the stopper bolts 290a and 290b can be adjusted in relation to the nuts 292.

[0025] The actuator 100 is a negative-pressure actuator, and the inside of the shell 120 is divided into a negative-pressure chamber 130 and an atmospheric chamber 150 by a diaphragm 160 and a diaphragm plate 165, with the negative-pressure chamber 130 connected to a negative-pressure source (not shown) via a supply / discharge pipe 110. When negative pressure is introduced into the negative-pressure chamber 130, the diaphragm plate 165 and the output rod 210 move upward in the figure (Figure 1(d)), and when the negative pressure is discharged from the negative-pressure chamber 130, the diaphragm plate 165 is returned to the shown position by a return spring 140 (Figure 1(b)).

[0026] As shown in Figure 1(b), when the exhaust pipe shut-off valve device is not in operation, the diaphragm plate 165 of the actuator 100 is pushed by the return spring 140, causing one stopper surface 282 of the lever 260 to contact the head of one stopper bolt 290b fixed to the bracket 220, and the butterfly-type valve 320 is held in the fully open or nearly fully open position.

[0027] When the valve is in operation, negative pressure is introduced into the negative pressure chamber 130 of the actuator 100. The pressure difference with the atmosphere pulls in the diaphragm plate 165, causing the lever 260 to rotate via the output rod 210. The other stopper surface 282 then contacts the other stopper bolt 290a, causing the butterfly-type valve 320 to close completely or nearly close. When the negative pressure is released from the negative pressure chamber 130, the diaphragm plate 165 and the output rod 210 are pushed towards the atmosphere chamber 150 by the biasing force of the return spring 140, returning to the non-operating position shown in Figure 1(b). In this way, when the exhaust pipe valve device operates, the pin insertion hole of the clevis 230, the connecting pin 240, and the pin insertion hole of the lever 260 rotate relative to each other.

[0028] Figure 2 shows the lever 260. The lever 260 has an elongated insertion hole 280 into which a connecting pin is inserted. The elongated insertion hole 280 has one end side 280a and the other end side 280b. The lever 260 also has a rotating shaft insertion hole 265 into which a rotating shaft 270 is inserted.

[0029] When the exhaust pipe valve device 1 is not operating (state shown in Figure 1(b)) and when the exhaust pipe valve device 1 is operating and the valve 320 is fully closed or nearly fully closed (state shown in Figure 1(d)), the connecting pin 240 is located at one end 280a of the elongated hole insertion hole 280. When the valve 320 is in an intermediate state between fully open and fully closed, the connecting pin 240 is located at the other end 280b of the elongated hole insertion hole 280. This configuration allows for a narrower range of oscillation of the valve 320 and a shorter length of the elongated hole insertion hole 280 compared to the case where the valve 320 is fully open when the connecting pin 240 is at one end 280a and fully closed when the connecting pin 240 is at the other end 280b.

[0030] The lever 260 is equipped with an elongated insertion hole 280, so that even when the lever 260 swings, the connecting pin 240 moves within the range of the elongated insertion hole 280, absorbing the lateral movement of the output rod 210. As a result, the output rod 210 moves without tilting, thus preventing the output rod 210 from tilting in a way that would cause deformation in the diaphragm 160.

[0031] Figure 2b shows another embodiment of the elongated insertion hole 280. The elongated insertion hole 280 has one end 280c and the other end 280d, and the one end 280c and the other end 280d are configured to form an arc (curve). By adopting this configuration of the elongated insertion hole 280, the connecting pin 240 can move more smoothly when moving between the one end 280c and the other end 280d.

[0032] As described above, the exhaust pipe opening and closing valve device, by having a long slot insertion hole 280 in the lever 260, suppresses the lateral movement of the output rod 210 even when the lever 260 swings, and the bearing 170 restricts the lateral movement of the output rod 210, thereby achieving a synergistic effect that suppresses wear and cracking of the diaphragm 160.

[0033] In this embodiment, the lever 260 of the exhaust pipe shut-off valve device 1 is provided with an elongated insertion hole 280, and the bearing 170 is provided with an airway 172. However, even if the exhaust pipe shut-off valve device is equipped with either the lever 260 having an elongated insertion hole 280 or the bearing 170 having an airway 172, it will still have the effect of suppressing wear and cracking of the diaphragm 160. [Explanation of symbols]

[0034] 1… Exhaust pipe shut-off valve device 100... Actuator 110…Supply / discharge pipe 120... Shell 130... Negative pressure chamber 140... Return spring 150... Atmospheric chamber 160... Diaphragm 165... Diaphragm plate 170...Bearing 171... Insertion hole 172... Airway 174... Tsuba (sword guard) 176... Notch 210…Output rod 220...bracket 230...Clevis 240…Connecting pin 260... Lever 265… Rotating shaft insertion hole 270... Rotation axis 280…Slotted insertion hole 282... Stopper surface 290... Volts 292... Nut 310… Valve housing 320... valve 330... Inner circumference hole 410...Deformed part 420…Axis line

Claims

1. A valve housing is provided in the middle of the exhaust pipe and has an inner circumferential hole that forms part of the exhaust pipe, A valve is supported so as to be able to open and close the inner circumferential hole of the valve housing, An actuator for rotating the valve, A transmission unit that transmits the output of the actuator to the valve, Equipped with, The transmission unit comprises an output rod, a clevis connected to the output rod, a lever connected to the clevis, and a valve connected to the lever. The clevis and the lever are connected by a connecting pin. The lever is provided with a pin insertion hole capable of supporting the connecting pin, The aforementioned pin insertion hole is elongated in shape. Exhaust pipe shut-off valve device.

2. The aforementioned pin insertion hole has one end and the other end, The valve housing is equipped with a stopper portion, The lever is provided with a plurality of stopper surfaces that come into contact with the stopper portion. When the stopper surface of the lever is in contact with the stopper portion, the connecting pin is configured to be positioned on one end side of the pin insertion hole. The exhaust pipe opening and closing valve device according to claim 1.

3. The output rod is configured to be movable by bearings equipped with an airway. The exhaust pipe opening and closing valve device according to claim 1.

4. The aforementioned airway is provided in the same direction as the direction of movement of the output rod, The exhaust pipe shut-off valve device according to claim 3.

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