Wastegate valve device and turbocharger

Abstract

A wastegate valve device is provided with: a valve body; one end side of the lever shaft is connected with the valve body; a lever plate provided on the other end side of the lever shaft; a lever pin protruding from the lever plate in the plate thickness direction of the lever plate; a lever including, on one end side, a plate-shaped joint portion in which an insertion hole through which the lever pin is inserted is formed; a driver for reciprocating the lever; and a beta-type pin attached to the lever pin and located on the opposite side of the lever plate with the joint portion therebetween in the plate thickness direction, the beta-type pin including: an insertion portion that extends in a straight line by inserting the lever pin into an extension hole extending in a direction orthogonal to the plate thickness direction; a locking part locked to the outer periphery of the lever pin and extending in a wave shape along the extension direction of the insertion part; a folded portion connecting one end of the insertion portion on one side in the extension direction and one end of the locking portion on one side in the extension direction; and an extension part extending toward the joint part with the other end of the other side in the extension direction of the locking part as a starting point, and the front end of the extension part is in contact with one end surface of the joint part on the side opposite to the lever plate side.

Description

Technical Field

[0001] The present invention relates to a wastegate valve device and a turbocharger equipped with the wastegate valve device. Background Art

[0002] Conventionally, turbochargers are known for increasing the output of an engine (internal combustion engine). These turbochargers include a turbine rotated by the engine's exhaust gas and a compressor that compresses the air supplied to the engine using the turbine's torque. Turbochargers are also sometimes equipped with a wastegate valve device to prevent damage to the engine or degradation of engine performance caused by the pressure (boost pressure) in the engine's intake passage rising above a specified value.

[0003] A wastegate valve device is installed in a bypass line that allows at least a portion of the engine's exhaust gas to bypass the turbine. By directing a portion of the exhaust gas into the bypass line, the wastegate valve device regulates the amount of exhaust gas flowing into the turbine, controlling the boost pressure to an appropriate level. This wastegate valve device drives an actuator (e.g., an electric actuator) based on the pressure in the engine's intake passage, opening and closing the valve body (adjusting the amount of opening and closing).

[0004] The wastegate valve device includes multiple link components that are interconnected to transmit the drive of an actuator to the valve body. Specifically, the multiple link components include a lever shaft, one end of which is connected to the valve body; a lever plate provided at the other end of the lever shaft; a lever pin protruding from the lever plate along the thickness of the lever plate; and a rod, which includes a plate-shaped joint portion with an insertion hole formed at one end for the lever pin to pass through, and is reciprocated by the actuator.

[0005] However, if exhaust gas pulsations from the engine or vibrations from the actuator occur, any of the multiple link components, such as the rod, can vibrate. Vibration of any of the multiple link components can cause rattle noise (sound produced by contact between the multiple link components) in the wastegate valve device, reducing the quietness of the wastegate valve. Furthermore, contact between the multiple link components can cause wear.

[0006] To address this situation, for example, Patent Document 1 discloses that a biasing member for biasing the lever pin toward the lever joint or the center of the insertion hole is provided inside the insertion hole to prevent the lever joint and the lever pin from contacting each other.

[0007] Previous technical literature Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2018-071550 Summary of the Invention

[0008] Technical issues to be solved by the invention However, the technology described in Patent Document 1 does not take into account the noise or wear generated by the joint portion of the rod and the lever plate colliding with each other.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a wastegate valve device capable of suppressing noise and wear caused by collision between a joint portion of a rod and a lever plate.

[0010] Means for solving technical problems In order to achieve the above-mentioned object, the wastegate valve device involved in the present invention comprises: a valve body; a lever shaft, one end of which is connected to the valve body; a lever plate, which is provided on the other end of the lever shaft; a lever pin, which protrudes from the lever plate in the plate thickness direction of the lever plate; a rod, which includes a plate-shaped joint portion having an insertion hole formed on one end thereof for inserting the lever pin; an actuator for reciprocating the rod; and a β-shaped pin, which is mounted on the lever pin and is located on the opposite side of the lever plate across the joint portion in the plate thickness direction, the β-shaped pin comprising: an insertion hole; The lever pin is inserted into the extension hole extending in a direction perpendicular to the plate thickness direction and extends in a straight line; the locking portion is locked to the outer periphery of the lever pin and extends in a wavy shape along the extension direction of the insertion portion; the return portion connects one end of the insertion portion on one side in the extension direction and one end of the locking portion on one side in the extension direction; and the extension portion extends toward the joint portion with the other end of the locking portion on the other side in the extension direction as a starting point, and the front end contacts one end surface of the joint portion on the side opposite to the lever plate side.

[0011] Effects of the Invention According to the wastegate valve device of the present invention, it is possible to suppress the occurrence of noise and wear caused by the joint portion of the rod and the lever plate colliding with each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view schematically showing the structure of a turbocharger including a wastegate valve device according to several embodiments.

[0013] Figure 2 It is a diagram schematically showing the structure of the wastegate valve device according to the first embodiment.

[0014] Figure 3 This is a diagram schematically showing the structure of a β-shaped pin according to the first embodiment.

[0015] Figure 4 It means Figure 3 The diagram shows a state where the β-shaped pin is attached to the lever pin.

[0016] Figure 5 It means Figure 3 The diagram shows a state where the β-shaped pin is attached to the lever pin.

[0017] Figure 6 It is a diagram schematically showing the structure of β-type pins according to several embodiments.

[0018] Figure 7 These are enlarged views of the distal ends of extension portions according to several embodiments.

[0019] Figure 8 This is a diagram schematically showing the structure of a β-shaped pin according to the second embodiment.

[0020] Figure 9 It means Figure 8 The diagram shows a state where the β-shaped pin is attached to the lever pin.

[0021] Figure 10 This is a diagram showing a state where a β-shaped pin according to a first modified example of the second embodiment is attached to a lever pin.

[0022] Figure 11 This is a diagram showing a state where a β-shaped pin according to a second modification of the second embodiment is attached to a lever pin.

[0023] Figure 12 This is a diagram showing a state where a β-shaped pin according to a third embodiment is attached to a lever pin.

[0024] Figure 13 This is a diagram showing a state where a β-shaped pin according to a fourth embodiment is attached to a lever pin. DETAILED DESCRIPTION

[0025] Hereinafter, a wastegate valve device and a turbocharger according to an embodiment of the present invention will be described with reference to the accompanying drawings. This embodiment represents one aspect of the present invention and does not limit the present invention, and any modifications can be made within the scope of the technical concept of the present invention.

[0026] Figure 1 1 is a diagram schematically showing the structure of a turbocharger 100 including a wastegate valve device 1 according to several embodiments. Figure 1 As shown, the turbocharger 100 includes a turbine wheel 102 , a compressor wheel 104 , a rotating shaft 106 connecting the turbine wheel 102 and the compressor wheel 104 , and the wastegate valve device 1 .

[0027] The turbine impeller 102 is provided in an exhaust gas conduit 202 through which exhaust gas G discharged from the engine 200 flows. The compressor impeller 104 is provided in an intake conduit 204 through which combustion air A supplied to the engine 200 flows. A rotating shaft 106 has a longitudinal direction, with one end in the longitudinal direction mechanically coupled to the turbine impeller 102 and the other end in the longitudinal direction mechanically coupled to the compressor impeller 104. Therefore, the compressor impeller 104 transmits the power of the turbine impeller 102, which is rotationally driven by the exhaust gas G, via the rotating shaft 106, thereby compressing the combustion air A flowing through the intake conduit 204.

[0028] The exhaust gas line 202 includes a bypass line 210 for conveying a portion of the exhaust gas G from the upstream side to the downstream side of the turbine impeller 102 without passing through the turbine impeller 102. Figure 1 In the illustrated embodiment, the exhaust gas line 202 includes an upstream exhaust gas line 206 connecting the engine 200 and the turbine impeller 102, a downstream exhaust gas line 208 through which the exhaust gas G passing through the turbine impeller 102 flows, and a bypass line 210 connecting the upstream exhaust gas line 206 and the downstream exhaust gas line 208.

[0029] The wastegate valve device 1 is provided in the bypass line 210 and is configured to open and close the bypass line 210. By diverting a portion of the exhaust gas G flowing through the upstream exhaust gas line 206 toward the turbine impeller 102 to the bypass line 210, the wastegate valve device 1 can reduce the flow rate and thermal energy of the exhaust gas G delivered to the turbine impeller 102. In other words, the wastegate valve device 1 can lower the boost pressure of the combustion air A. The wastegate valve device 1 will be described in detail below.

[0030] <First embodiment> (structure) Figure 2 1 is a diagram schematically showing the structure of the wastegate valve device 1 according to the first embodiment. Figure 2 As shown, the wastegate valve device 1 includes a valve body 2 , a lever shaft 4 , a lever plate 6 , a lever pin 8 , a rod 10 , an actuator 12 , and a β-shaped pin 14 .

[0031] The valve body 2 is arranged in the bypass line 210. The lever shaft 4 has a rod shape, one end of which is Figure 2 The lower side is on the paper) and is connected to the valve body 2.

[0032] The lever plate 6 has a flat plate shape and is provided on the other end side of the lever shaft 4 (at Figure 2 Hereinafter, the side of the lever plate 6 on the valve body 2 side in the plate thickness direction (hereinafter referred to as the plate thickness direction D1) is referred to as the bottom, and the side opposite to the valve body 2 side in the plate thickness direction D1 is referred to as the top.

[0033] The lever pin 8 has a cylindrical shape and protrudes upward from the upper surface 6a of the lever plate 6 along the plate thickness direction D1. The lever pin 8 can be formed integrally with the lever plate 6 or fixed to the lever plate 6 by a fastening portion such as a bolt. The lever pin 8 has an extension hole 3 extending in a direction (horizontally) perpendicular to the plate thickness direction D1. Figure 2 In the illustrated embodiment, the extension hole 3 extends along a direction (intersecting direction D3 ) intersecting the direction (extension direction D2 ) in which the rod 10 extends, among the horizontal directions.

[0034] The rod 10 includes a plate-shaped joint portion 7 having an insertion hole 5 formed on one end thereof for inserting the lever pin 8. Figure 2 In the illustrated embodiment, rod 10 extends linearly from actuator 12 toward lever pin 8, connecting lever pin 8 and actuator 12. Rod 10 is not limited to a linear extension; it may also have a curved or bent shape. Hereinafter, the direction in which rod 10 extends from actuator 12 toward lever pin 8 is referred to as one side in extension direction D2, and the direction opposite to the one side in extension direction D2 is referred to as the other side in extension direction D2.

[0035] The actuator 12 reciprocates the rod 10 along the extension direction D2. The actuator 12 reciprocates the rod 10 along the extension direction D2 based on, for example, the pressure of the combustion air A supplied to the engine 200. The actuator 12 may be an electric actuator using an electric motor as a drive source, or a positive pressure actuator.

[0036] The wastegate valve device 1 having the above structure transmits the reciprocating movement of the rod 10 to the lever pin 8, lever plate 6, lever shaft 4 and valve body 2 in sequence.

[0037] The β-shaped pin 14 is attached to the lever pin 8. The β-shaped pin 14 is located on the opposite side of the lever plate 6 across the joint 7 of the rod 10 in the plate thickness direction D1. In other words, the β-shaped pin 14 is located above the joint 7 of the rod 10. This β-shaped pin 14 prevents the rod 10 from falling off the lever pin 8 by interfering with the joint 7. Figure 3 , the specific structure of the β-type pin 14 is described.

[0038] Figure 3 This is a diagram schematically showing the structure of the β-shaped pin 14 according to the first embodiment. Figure 4 It means Figure 3 The diagram shows a state in which the β-shaped pin 14 is attached to the lever pin 8 , and the lever pin 8 is viewed from above in the plate thickness direction D1 . Figure 5 It means Figure 3 The figure shows a state where the β-shaped pin 14 is attached to the lever pin 8 , and the β-shaped pin 14 is viewed from one side in the extending direction D2 .

[0039] like Figure 3 As shown, the β-shaped pin 14 includes an insertion portion 16, a locking portion 18, a folded portion 20, and an extension portion 22. The β-shaped pin 14 is made of a flexible metal such as stainless steel.

[0040] The insertion portion 16 extends in a straight line. Figure 4 As shown, the insertion portion 16 is inserted into the extension hole 3 formed in the lever pin 8. The insertion portion 16 passes through the lever pin 8. The locking portion 18 is locked to the outer periphery 24 of the lever pin 8. The locking portion 18 extends in a wavy manner along the extension direction of the insertion portion 16 (hereinafter referred to as the cross direction D3). The locking portion 18 has an arc shape in the middle and is gently bent multiple times. The locking portion 18 contacts a portion of the outer periphery 24 of the lever pin 8 on one side in the extension direction D2. The return portion 20 connects one end 16a of the insertion portion 16 on one side in the cross direction D3 and one end 18a of the locking portion 18 on one side in the cross direction D3. Therefore, the insertion portion 16 and the locking portion 18 clamp the lever pin 8 by the restoring force of the β-shaped pin 14, thereby fixing the β-shaped pin 14 to the lever pin 8.

[0041] The extension portion 22 extends toward the joint portion 7 starting from the other end 18b on the other side of the locking portion 18 in the cross direction D3. Figure 5 As shown, the front end 23 of the extension portion 22 is in contact with the upper surface 7 a which is one end surface of the joint portion 7 on the side opposite to the lever plate 6 side.

[0042] In the first embodiment, as Figure 4 As shown, the locking portion 18 and the extending portion 22 are located on the opposite side of the rod 10 from the insertion portion 16. Specifically, the locking portion 18 and the extending portion 22 are located on one side (driver 12 side) of the insertion portion 16 in the extending direction D2.

[0043] (Function and Effect) The functions and effects of the wastegate valve device 1 according to the first embodiment will be described. According to the first embodiment, the β-shaped pin 14, in addition to its conventional anti-drop function, also has a pressing function for pressing the joint portion 7 of the rod 10 against the lever plate 6 by including the extension portion 22. This pressing function eliminates the gap (play) between the joint portion 7 of the rod 10 and the lever plate 6, thereby suppressing rattling of the joint portion 7 of the rod 10 in the plate thickness direction D1. Consequently, noise and wear caused by collision between the joint portion 7 of the rod 10 and the lever plate 6 can be suppressed. Furthermore, since the wastegate valve device 1 does not require additional components such as leaf springs, the extension portion 22 can simply be included in the β-shaped pin conventionally provided in wastegate valve devices, thereby minimizing cost increases. Furthermore, the β-shaped pin 14's pressing function suppresses contact between the lever pin 8 inserted through the insertion hole 5 of the joint portion 7 and the inner circumferential surface of the insertion hole 5, further minimizing noise and wear caused by collision between the joint portion 7 and the lever pin 8.

[0044] When the joint portion 7 vibrates in the plate thickness direction D1, the gap formed between the joint portion 7 and the lever plate 6 may increase as it moves from the lever pin 8 toward the side in the extension direction D2 (the driver side). According to the first embodiment, the front end 23 of the extension portion 22 presses the joint portion 7 of the rod 10 toward the lever plate 6 from the side closer to the lever pin 8 in the extension direction D2, thereby further suppressing the rattling of the joint portion 7 of the rod 10 in the plate thickness direction D1. Furthermore, in the first embodiment, the front end 23 of the extension portion 22 is located closer to the side of the lever pin 8 in the extension direction D2, but the present invention is not limited to this configuration. Although not shown, in some embodiments, the extension portion 22 is located closer to the other side of the insertion portion 16 in the extension direction D2. In some embodiments, the extension portion 22 is located closer to one or the other side of the lever pin 8 in the cross direction D3 (the width direction of the lever plate 6). In this case, the extension hole 3 of the lever pin 8 extends along the extension direction D2.

[0045] Figure 6 1 is a diagram schematically showing the structure of the β-shaped pin 14 according to several embodiments. Figure 6 In the illustrated embodiment, the extension portion 22 includes a twisted portion 29, at least a portion of which is twisted in a circular shape. The twisted portion 29 is located on the side opposite the distal end 23 of the extension portion 22 in the direction in which the extension portion 22 extends. This structure increases the load exerted by the β-shaped pin 14 on the lever plate 6 to press the joint portion 7 of the rod 10, thereby further suppressing play of the joint portion 7 of the rod 10 in the plate thickness direction D1.

[0046] Figure 7 2 is an enlarged view of the front end 23 of the extension portion 22 according to several embodiments. Figure 7In the illustrated embodiment, the extension portion 22 includes a contact surface 27 formed by cutting the lower side of the front end surface 25 located farthest from the other end 18b of the locking portion 18. With this structure, the contact area between the front end 23 of the extension portion 22 and the upper surface 7a of the joint portion 7 can be increased.

[0047] <Second embodiment> A wastegate valve device 1 according to a second embodiment of the present invention will be described. The second embodiment differs from the first embodiment in that the β-shaped pin 14 further includes a line contact portion 30. In the second embodiment, components identical to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0048] Figure 8 This is a diagram schematically showing the structure of a β-shaped pin 14 according to the second embodiment. Figure 9 It means Figure 8 The β-shaped pin 14 is shown in the figure as being mounted on the lever pin 8. Figure 8 As shown in the example, the β-shaped pin 14 further includes a line contact portion 30 extending linearly from the front end 23 of the extension portion 22. The line contact portion 30 contacts the upper surface 7a of the joint portion 7. In the second embodiment, as shown in FIG. Figure 9 As illustrated, the line contact portion 30 extends from the front end 23 of the extending portion 22 along the other side in the extending direction D2 .

[0049] According to the second embodiment, the load of the β-shaped pin 14 pressing the joint 7 of the rod 10 toward the lever plate 6 can be applied to a large area of the upper surface 7 a of the joint 7 , thereby further suppressing play of the joint 7 of the rod 10 in the plate thickness direction D1 .

[0050] In the first embodiment, only the front end 23 of the extension portion 22 contacts the upper surface 7a of the joint portion 7, resulting in a small contact area. This may cause wear of at least one of the front end 23 of the extension portion 22 and the upper surface 7a of the joint portion 7 due to the load of the β-shaped pin 14. In contrast, according to the second embodiment, the contact area can be increased, thereby suppressing wear of either the front end 23 of the extension portion 22 or the upper surface 7a of the joint portion 7 due to the load of the β-shaped pin 14.

[0051] Furthermore, in the second embodiment, the line contact portion 30 extends from the front end 23 of the extension portion 22 along the other side in the extension direction D2 to effectively suppress rattling when the lever plate 6 or the joint portion 7 vibrates significantly near the lever pin 8. However, the present invention is not limited to this embodiment. The direction in which the line contact portion 30 extends may also be determined based on the vibration of the lever plate 6 or the joint portion 7.

[0052] Figure 10This is a diagram showing a state where a β-shaped pin 14 according to a first modified example of the second embodiment is attached to a lever pin 8 . Figure 11 1 is a diagram showing a state where the β-shaped pin 14 according to the second modification of the second embodiment is attached to the lever pin 8. Figure 10 In the illustrated embodiment, the line contact portion 30 extends from the front end 23 of the extension portion 22 along one side in the extension direction D2. Figure 10 In the structure, the β-shaped pin 14 presses the joint portion 7 to the lever plate 6 with a long contact range in the extension direction D2. Therefore, for example, it is advantageous when the lever plate 6 as a whole vibrates in parallel displacement with the same phase and the same displacement. Figure 11 In the illustrated embodiment, the extension portion 22 extends from the front end 23 along the other side in the cross direction D3. Figure 11 In the illustrated structure, the β-shaped pin 14 can press the joint portion 7 toward the lever plate 6 in a balanced manner in the intersecting direction D3. In addition, the load of the β-shaped pin 14 pressing the joint portion 7 toward the lever plate 6 can be increased.

[0053] <Third embodiment> A wastegate valve device 1 according to a third embodiment of the present invention will be described. The third embodiment differs from the second embodiment in that the line contact portion 30 further includes an opposing portion 40 and an extended connection portion 42. In the third embodiment, components identical to those of the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0054] Figure 12 1 is a diagram showing a state where the β-shaped pin 14 according to the third embodiment is mounted on the lever pin 8. Figure 12 As illustrated, the line contact portion 30 includes an opposing portion 40 located on the opposite side of the extending portion 22 with the lever pin 8 interposed therebetween in the extending direction D2 and an extending connecting portion 42 connecting the opposing portion 40 and the extending portion 22 .

[0055] exist Figure 12 In the illustrated embodiment, the opposing portion 40 extends along the cross-direction D3 with a relatively long contact range while contacting the upper surface 7a of the joint portion 7. One end 40a of the opposing portion 40 on one side in the cross-direction D3 is located closer to the side of the lever pin 8 in the cross-direction D3. Another end 40b of the opposing portion 40 on the other side in the cross-direction D3 is located closer to the other side of the lever pin 8 in the cross-direction D3. The extended connection portion 42 connects the one end 40a of the opposing portion 40 with the front end 23 of the extension portion 22. The extended connection portion 42 contacts the upper surface 7a of the joint portion 7.

[0056] According to the third embodiment, the β-shaped pins 14 press the joint 7 of the rod 10 toward the lever plate 6 from both sides of the lever pin 8 centered on the lever pin 8 in the extending direction D2, thereby improving the effect of suppressing the play of the joint 7 of the rod 10 in the plate thickness direction D1.

[0057] <Fourth embodiment> A wastegate valve device 1 according to a fourth embodiment of the present invention will now be described. The fourth embodiment differs from the first embodiment in that the β-shaped pin 14 further includes a second insertion portion 50, a second locking portion 52, a second folded portion 54, a second extension portion 56, and a connecting portion 58. In the fourth embodiment, components identical to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0058] Figure 13 1 is a diagram showing a state where the β-shaped pin 14 according to the fourth embodiment is mounted on the lever pin 8. Figure 13 As shown in the example, the β-shaped pin 14 further includes a second insertion portion 50 , a second locking portion 52 , a second folded portion 54 , a second extending portion 56 , and a connecting portion 58 .

[0059] The second insertion portion 50 extends in a straight line. Figure 13 As shown in the example, the second insertion portion 50 is inserted into the extension hole 3 formed in the lever pin 8. The second insertion portion 50 is inserted into the common extension hole 3 together with the insertion portion 16 and penetrates the lever pin 8. The second locking portion 52 is located on the opposite side of the lever pin 8 from the locking portion 18 and is locked to the outer circumference 24 of the lever pin 8. The second locking portion 52 extends in a wavy manner along the extension direction of the second insertion portion 50. In the fourth embodiment, the extension direction of the second insertion portion 50 is the same direction as the extension direction of the insertion portion 16 (cross direction D3). The second locking portion 52 has an arc shape midway and is gently bent multiple times. The second locking portion 52 contacts the portion of the outer circumference 24 of the lever pin 8 on the other side of the extension direction D2.

[0060] The second folded portion 54 connects one end 50a of the second insertion portion 50 on one side in the cross-direction D3 with one end 52a of the second locking portion 52 on one side in the cross-direction D3. The second extending portion 56 extends toward the joint portion 7 starting from the other end 52b of the second locking portion 52 on the other side in the cross-direction D3. The front end 57 of the second extending portion 56 contacts the upper surface 7a of the joint portion 7. The connecting portion 58 connects the other end 50b of the second insertion portion 50 on the other side in the cross-direction D3 with the other end 16b of the insertion portion 16 on the other side in the cross-direction D3.

[0061] According to the fourth embodiment, the β-shaped pins 14 press the joint 7 of the rod 10 toward the lever plate 6 from both sides of the lever pin 8 , thereby enhancing the effect of suppressing play of the joint 7 of the rod 10 in the plate thickness direction D1 .

[0062] The contents described in each of the above embodiments can be understood, for example, as follows.

[0063] [1] The wastegate valve device 1 according to the present invention comprises: Valve body 2; A lever shaft 4, one end of which is connected to the valve body; A lever plate 6 is provided on the other end side of the lever shaft; A lever pin 8 protrudes from the lever plate along a thickness direction D1 of the lever plate; The rod 10 includes a plate-shaped joint portion formed with an insertion hole 5 for inserting the lever pin at one end side; a driver 12 for reciprocating the rod; and The β-shaped pin 14 is mounted on the lever pin and is located on the opposite side of the lever plate across the joint portion in the plate thickness direction. The β-type pin includes: The insertion portion 16 is configured to insert the lever pin into the extension hole 3 extending in a direction D3 perpendicular to the plate thickness direction and extending in a straight line; The locking portion 18 is locked to the outer periphery 24 of the lever pin and extends in a wave shape along the extension direction of the insertion portion; a folding portion 20 connecting one end 16a of the inserting portion on one side in the extending direction and one end 18a of the locking portion on one side in the extending direction; and The extension portion 22 extends toward the joint portion starting from the other end 18b of the locking portion in the extending direction, and the front end 23 contacts the end surface 7a of the joint portion opposite to the lever plate.

[0064] According to the structure described in [1] above, the β-shaped pin includes an extension portion, which, in addition to the conventional anti-falling function of preventing the rod joint from falling off the lever pin, can also have a pressing function for pressing the rod joint against the lever plate. Moreover, this pressing function eliminates the gap (play) between the rod joint and the lever plate, thereby suppressing the shaking of the rod joint in the plate thickness direction. Therefore, it is possible to suppress the noise and wear caused by the rod joint and the lever plate colliding with each other. In addition, it is not necessary to add components such as a leaf spring to the wastegate valve device, and it is sufficient to include the extension portion in the β-shaped pin conventionally provided in the wastegate valve device, thereby suppressing cost increases.

[0065] Moreover, according to the structure described in [1] above, the β-shaped pin has a pressing function, which suppresses the contact between the lever pin inserted into the insertion hole of the joint part and the inner peripheral surface of the insertion hole, and can also suppress the sound or wear caused by the joint part and the lever pin colliding with each other.

[0066] [2] In some embodiments, in the structure described in [1] above, The locking portion and the extending portion are respectively located on a side of the rod opposite to the one end side relative to the insertion portion.

[0067] When the joint portion vibrates in the plate thickness direction, the gap formed between the joint portion and the lever plate may increase as it moves from the lever pin toward the other end side of the rod (the actuator side). According to the structure described in [2] above, the β-shaped pin presses the joint portion of the rod toward the lever plate from the other end side of the rod closer to the lever pin, thereby further suppressing the shaking of the joint portion of the rod in the plate thickness direction.

[0068] [3] In some embodiments, in the structure described in [1] or [2] above, the extension portion includes a twisted portion 29 at least a portion of which is twisted in a ring shape.

[0069] According to the structure described in [3] above, the load of the β-shaped pin pressing the joint portion of the rod toward the lever plate can be increased, thereby further suppressing the shaking of the joint portion of the rod in the plate thickness direction.

[0070] [4] In some embodiments, in the structure described in any one of [1] to [3] above, The beta pin further comprises: The line contact portion 30 extends from the front end of the extending portion while contacting the one end surface of the joint portion.

[0071] According to the structure described in [4] above, the load of the β-shaped pin pressing the joint portion of the rod toward the lever plate can be applied to one end surface of the joint portion over a wide range, thereby further suppressing the shaking of the joint portion of the rod in the plate thickness direction. Furthermore, wear of at least one of the β-shaped pin and the joint portion of the rod caused by this load can be suppressed.

[0072] [5] In some embodiments, in the structure described in [4] above, The line contact portion includes: an opposing portion 40 located on the opposite side of the extending portion across the lever pin; and The extended connecting portion 42 connects the opposing portion and the extended portion.

[0073] According to the structure described in [5] above, the β-shaped pin presses the joint portion of the rod toward the lever plate from both sides of the lever pin, thereby improving the effect of suppressing the shaking of the joint portion of the rod in the plate thickness direction.

[0074] [6] In some embodiments, in the structure described in any one of [1] to [5] above, The beta pin further comprises: The second insertion portion 50 is inserted into the extension hole and extends in a straight line; a second locking portion 52 located on the opposite side of the locking portion across the lever pin and locked to the outer periphery of the lever pin, and extending in a wavy shape along the second extension direction of the second insertion portion; a second folded portion 54 connecting one end 50a of the second insertion portion on the second extending direction and one end 52a of the second locking portion on the second extending direction; a second extending portion 56 extending toward the joint portion from the other end 52b of the second locking portion on the other side in the second extending direction as a starting point, with a front end 57 in contact with the one end surface of the joint portion; and The connecting portion 58 connects the other end 50b of the second insertion portion on the other side in the second extending direction and the other end 16b of the insertion portion on the other side in the extending direction.

[0075] According to the structure described in [6] above, the β-shaped pin presses the joint portion of the rod toward the lever plate from both sides of the lever pin, thereby improving the effect of suppressing the shaking of the joint portion of the rod in the plate thickness direction.

[0076] [7] The turbocharger 100 according to the present invention includes the wastegate valve device according to any one of [1] to [6] above.

[0077] According to the structure described in [7] above, a turbocharger can be provided that can suppress the noise and wear caused by the joint portion of the rod and the lever plate colliding with each other.

[0078] Explanation of symbols 1-Wastegate valve device, 2-Valve body, 3-Extension hole, 4-Lever shaft, 5-Insert hole, 6-Lever plate, 6a-Upper surface of the lever plate, 7-Joint portion, 7a-Upper surface of the joint portion, 8-Lever pin, 10-Rod, 12-Actuator, 14-β-shaped pin, 16-Insertion portion, 16a-One end of the insertion portion, 18-Locking portion, 18a-One end of the locking portion, 18b-Other end of the locking portion, 20-Return portion, 22-Extension portion, 23-Front end of the extension portion, 24-Outer periphery of the lever pin, 25-Front end surface, 27-Contact surface, 29-Twisted portion, 30-Line contact portion, 40-opposing portion, 42-extended connecting portion, 50-second insertion portion, 52-second locking portion, 54-second folding portion, 56-second extension portion, 57-front end of the second extension portion, 58-connecting portion, 100-turbocharger, 102-turbine impeller, 104-compressor impeller, 106-rotating shaft, 200-engine, 202-exhaust gas pipe, 204-intake pipe, 206-upstream exhaust gas pipe, 208-downstream exhaust gas pipe, 210-bypass pipe, A-combustion air, D1-plate thickness direction, D2-extension direction, D3-cross direction, G-exhaust gas.

Claims

1. A wastegate valve device comprising: Valve body; A lever shaft, one end of which is connected to the valve body; a lever plate provided on the other end side of the lever shaft; a lever pin protruding from the lever plate along the thickness direction of the lever plate; a rod including a plate-shaped joint portion having an insertion hole formed on one end side for inserting the lever pin; a driver for causing the rod to reciprocate; and a β-shaped pin mounted on the lever pin and located on the opposite side of the lever plate across the joint portion in the plate thickness direction; The β-type pin includes: an insertion portion, which inserts the lever pin into an extension hole extending in a direction perpendicular to the plate thickness direction and extends in a straight line; a locking portion locked to the outer periphery of the lever pin and extending in a wave shape along the extending direction of the insertion portion; a folding portion connecting one end of the insertion portion on one side in the extending direction and one end of the locking portion on one side in the extending direction; and The extension portion extends toward the joint portion starting from the other end of the locking portion on the other side in the extending direction, and the front end contacts an end surface of the joint portion on the side opposite to the lever plate.

2. The wastegate valve device according to claim 1, wherein: The locking portion and the extending portion are respectively located on a side of the rod opposite to the one end side relative to the insertion portion.

3. The wastegate valve device according to claim 1 or 2, wherein: The extension portion includes a twisted portion at least a portion of which is twisted in a ring shape.

4. The wastegate valve device according to claim 1 or 2, wherein: The beta pin further comprises: A line contact portion extends from the front end of the extending portion while contacting the one end surface of the joint portion.

5. The wastegate valve device according to claim 4, wherein: The line contact portion includes: an opposing portion located on a side opposite to the extending portion across the lever pin; and The extended connecting portion connects the opposing portion and the extending portion.

6. The wastegate valve device according to claim 1 or 2, wherein: The beta pin further comprises: a second insertion portion inserted into the extension hole and extending in a straight line; a second locking portion located on the opposite side of the locking portion across the lever pin and locked to the outer periphery of the lever pin, and extending in a wave shape along the second extension direction of the second insertion portion; a second folded portion connecting one end of the second insertion portion on one side in the second extending direction and one end of the second locking portion on one side in the second extending direction; a second extending portion extending toward the joint portion from the other end of the second locking portion on the other side in the second extending direction as a starting point, with a front end in contact with the one end surface of the joint portion; and The connecting portion connects the other end of the second insertion portion on the other side in the second extending direction and the other end of the insertion portion on the other side in the extending direction.

7. A turbocharger comprising the wastegate valve device according to claim 1 or 2.

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